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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * PCI Bus Services, see include/linux/pci.h for further explanation. |
3 | * | |
4 | * Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter, | |
5 | * David Mosberger-Tang | |
6 | * | |
7 | * Copyright 1997 -- 2000 Martin Mares <mj@ucw.cz> | |
8 | */ | |
9 | ||
2ab51dde | 10 | #include <linux/acpi.h> |
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/delay.h> | |
9d26d3a8 | 13 | #include <linux/dmi.h> |
1da177e4 | 14 | #include <linux/init.h> |
7c674700 LP |
15 | #include <linux/of.h> |
16 | #include <linux/of_pci.h> | |
1da177e4 | 17 | #include <linux/pci.h> |
075c1771 | 18 | #include <linux/pm.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <linux/module.h> |
21 | #include <linux/spinlock.h> | |
4e57b681 | 22 | #include <linux/string.h> |
229f5afd | 23 | #include <linux/log2.h> |
7d715a6c | 24 | #include <linux/pci-aspm.h> |
c300bd2f | 25 | #include <linux/pm_wakeup.h> |
8dd7f803 | 26 | #include <linux/interrupt.h> |
32a9a682 | 27 | #include <linux/device.h> |
b67ea761 | 28 | #include <linux/pm_runtime.h> |
608c3881 | 29 | #include <linux/pci_hotplug.h> |
4d3f1384 | 30 | #include <linux/vmalloc.h> |
32a9a682 | 31 | #include <asm/setup.h> |
2a2aca31 | 32 | #include <asm/dma.h> |
b07461a8 | 33 | #include <linux/aer.h> |
bc56b9e0 | 34 | #include "pci.h" |
1da177e4 | 35 | |
00240c38 AS |
36 | const char *pci_power_names[] = { |
37 | "error", "D0", "D1", "D2", "D3hot", "D3cold", "unknown", | |
38 | }; | |
39 | EXPORT_SYMBOL_GPL(pci_power_names); | |
40 | ||
93177a74 RW |
41 | int isa_dma_bridge_buggy; |
42 | EXPORT_SYMBOL(isa_dma_bridge_buggy); | |
43 | ||
44 | int pci_pci_problems; | |
45 | EXPORT_SYMBOL(pci_pci_problems); | |
46 | ||
1ae861e6 RW |
47 | unsigned int pci_pm_d3_delay; |
48 | ||
df17e62e MG |
49 | static void pci_pme_list_scan(struct work_struct *work); |
50 | ||
51 | static LIST_HEAD(pci_pme_list); | |
52 | static DEFINE_MUTEX(pci_pme_list_mutex); | |
53 | static DECLARE_DELAYED_WORK(pci_pme_work, pci_pme_list_scan); | |
54 | ||
55 | struct pci_pme_device { | |
56 | struct list_head list; | |
57 | struct pci_dev *dev; | |
58 | }; | |
59 | ||
60 | #define PME_TIMEOUT 1000 /* How long between PME checks */ | |
61 | ||
1ae861e6 RW |
62 | static void pci_dev_d3_sleep(struct pci_dev *dev) |
63 | { | |
64 | unsigned int delay = dev->d3_delay; | |
65 | ||
66 | if (delay < pci_pm_d3_delay) | |
67 | delay = pci_pm_d3_delay; | |
68 | ||
50b2b540 AH |
69 | if (delay) |
70 | msleep(delay); | |
1ae861e6 | 71 | } |
1da177e4 | 72 | |
32a2eea7 JG |
73 | #ifdef CONFIG_PCI_DOMAINS |
74 | int pci_domains_supported = 1; | |
75 | #endif | |
76 | ||
4516a618 AN |
77 | #define DEFAULT_CARDBUS_IO_SIZE (256) |
78 | #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024) | |
79 | /* pci=cbmemsize=nnM,cbiosize=nn can override this */ | |
80 | unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE; | |
81 | unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE; | |
82 | ||
28760489 EB |
83 | #define DEFAULT_HOTPLUG_IO_SIZE (256) |
84 | #define DEFAULT_HOTPLUG_MEM_SIZE (2*1024*1024) | |
85 | /* pci=hpmemsize=nnM,hpiosize=nn can override this */ | |
86 | unsigned long pci_hotplug_io_size = DEFAULT_HOTPLUG_IO_SIZE; | |
87 | unsigned long pci_hotplug_mem_size = DEFAULT_HOTPLUG_MEM_SIZE; | |
88 | ||
e16b4660 KB |
89 | #define DEFAULT_HOTPLUG_BUS_SIZE 1 |
90 | unsigned long pci_hotplug_bus_size = DEFAULT_HOTPLUG_BUS_SIZE; | |
91 | ||
27d868b5 | 92 | enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_DEFAULT; |
b03e7495 | 93 | |
ac1aa47b JB |
94 | /* |
95 | * The default CLS is used if arch didn't set CLS explicitly and not | |
96 | * all pci devices agree on the same value. Arch can override either | |
97 | * the dfl or actual value as it sees fit. Don't forget this is | |
98 | * measured in 32-bit words, not bytes. | |
99 | */ | |
15856ad5 | 100 | u8 pci_dfl_cache_line_size = L1_CACHE_BYTES >> 2; |
ac1aa47b JB |
101 | u8 pci_cache_line_size; |
102 | ||
96c55900 MS |
103 | /* |
104 | * If we set up a device for bus mastering, we need to check the latency | |
105 | * timer as certain BIOSes forget to set it properly. | |
106 | */ | |
107 | unsigned int pcibios_max_latency = 255; | |
108 | ||
6748dcc2 RW |
109 | /* If set, the PCIe ARI capability will not be used. */ |
110 | static bool pcie_ari_disabled; | |
111 | ||
9d26d3a8 MW |
112 | /* Disable bridge_d3 for all PCIe ports */ |
113 | static bool pci_bridge_d3_disable; | |
114 | /* Force bridge_d3 for all PCIe ports */ | |
115 | static bool pci_bridge_d3_force; | |
116 | ||
117 | static int __init pcie_port_pm_setup(char *str) | |
118 | { | |
119 | if (!strcmp(str, "off")) | |
120 | pci_bridge_d3_disable = true; | |
121 | else if (!strcmp(str, "force")) | |
122 | pci_bridge_d3_force = true; | |
123 | return 1; | |
124 | } | |
125 | __setup("pcie_port_pm=", pcie_port_pm_setup); | |
126 | ||
1da177e4 LT |
127 | /** |
128 | * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children | |
129 | * @bus: pointer to PCI bus structure to search | |
130 | * | |
131 | * Given a PCI bus, returns the highest PCI bus number present in the set | |
132 | * including the given PCI bus and its list of child PCI buses. | |
133 | */ | |
07656d83 | 134 | unsigned char pci_bus_max_busnr(struct pci_bus *bus) |
1da177e4 | 135 | { |
94e6a9b9 | 136 | struct pci_bus *tmp; |
1da177e4 LT |
137 | unsigned char max, n; |
138 | ||
b918c62e | 139 | max = bus->busn_res.end; |
94e6a9b9 YW |
140 | list_for_each_entry(tmp, &bus->children, node) { |
141 | n = pci_bus_max_busnr(tmp); | |
3c78bc61 | 142 | if (n > max) |
1da177e4 LT |
143 | max = n; |
144 | } | |
145 | return max; | |
146 | } | |
b82db5ce | 147 | EXPORT_SYMBOL_GPL(pci_bus_max_busnr); |
1da177e4 | 148 | |
1684f5dd AM |
149 | #ifdef CONFIG_HAS_IOMEM |
150 | void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar) | |
151 | { | |
1f7bf3bf BH |
152 | struct resource *res = &pdev->resource[bar]; |
153 | ||
1684f5dd AM |
154 | /* |
155 | * Make sure the BAR is actually a memory resource, not an IO resource | |
156 | */ | |
646c0282 | 157 | if (res->flags & IORESOURCE_UNSET || !(res->flags & IORESOURCE_MEM)) { |
1f7bf3bf | 158 | dev_warn(&pdev->dev, "can't ioremap BAR %d: %pR\n", bar, res); |
1684f5dd AM |
159 | return NULL; |
160 | } | |
1f7bf3bf | 161 | return ioremap_nocache(res->start, resource_size(res)); |
1684f5dd AM |
162 | } |
163 | EXPORT_SYMBOL_GPL(pci_ioremap_bar); | |
c43996f4 LR |
164 | |
165 | void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar) | |
166 | { | |
167 | /* | |
168 | * Make sure the BAR is actually a memory resource, not an IO resource | |
169 | */ | |
170 | if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) { | |
171 | WARN_ON(1); | |
172 | return NULL; | |
173 | } | |
174 | return ioremap_wc(pci_resource_start(pdev, bar), | |
175 | pci_resource_len(pdev, bar)); | |
176 | } | |
177 | EXPORT_SYMBOL_GPL(pci_ioremap_wc_bar); | |
1684f5dd AM |
178 | #endif |
179 | ||
687d5fe3 ME |
180 | |
181 | static int __pci_find_next_cap_ttl(struct pci_bus *bus, unsigned int devfn, | |
182 | u8 pos, int cap, int *ttl) | |
24a4e377 RD |
183 | { |
184 | u8 id; | |
55db3208 SS |
185 | u16 ent; |
186 | ||
187 | pci_bus_read_config_byte(bus, devfn, pos, &pos); | |
24a4e377 | 188 | |
687d5fe3 | 189 | while ((*ttl)--) { |
24a4e377 RD |
190 | if (pos < 0x40) |
191 | break; | |
192 | pos &= ~3; | |
55db3208 SS |
193 | pci_bus_read_config_word(bus, devfn, pos, &ent); |
194 | ||
195 | id = ent & 0xff; | |
24a4e377 RD |
196 | if (id == 0xff) |
197 | break; | |
198 | if (id == cap) | |
199 | return pos; | |
55db3208 | 200 | pos = (ent >> 8); |
24a4e377 RD |
201 | } |
202 | return 0; | |
203 | } | |
204 | ||
687d5fe3 ME |
205 | static int __pci_find_next_cap(struct pci_bus *bus, unsigned int devfn, |
206 | u8 pos, int cap) | |
207 | { | |
208 | int ttl = PCI_FIND_CAP_TTL; | |
209 | ||
210 | return __pci_find_next_cap_ttl(bus, devfn, pos, cap, &ttl); | |
211 | } | |
212 | ||
24a4e377 RD |
213 | int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap) |
214 | { | |
215 | return __pci_find_next_cap(dev->bus, dev->devfn, | |
216 | pos + PCI_CAP_LIST_NEXT, cap); | |
217 | } | |
218 | EXPORT_SYMBOL_GPL(pci_find_next_capability); | |
219 | ||
d3bac118 ME |
220 | static int __pci_bus_find_cap_start(struct pci_bus *bus, |
221 | unsigned int devfn, u8 hdr_type) | |
1da177e4 LT |
222 | { |
223 | u16 status; | |
1da177e4 LT |
224 | |
225 | pci_bus_read_config_word(bus, devfn, PCI_STATUS, &status); | |
226 | if (!(status & PCI_STATUS_CAP_LIST)) | |
227 | return 0; | |
228 | ||
229 | switch (hdr_type) { | |
230 | case PCI_HEADER_TYPE_NORMAL: | |
231 | case PCI_HEADER_TYPE_BRIDGE: | |
d3bac118 | 232 | return PCI_CAPABILITY_LIST; |
1da177e4 | 233 | case PCI_HEADER_TYPE_CARDBUS: |
d3bac118 | 234 | return PCI_CB_CAPABILITY_LIST; |
1da177e4 | 235 | } |
d3bac118 ME |
236 | |
237 | return 0; | |
1da177e4 LT |
238 | } |
239 | ||
240 | /** | |
f7625980 | 241 | * pci_find_capability - query for devices' capabilities |
1da177e4 LT |
242 | * @dev: PCI device to query |
243 | * @cap: capability code | |
244 | * | |
245 | * Tell if a device supports a given PCI capability. | |
246 | * Returns the address of the requested capability structure within the | |
247 | * device's PCI configuration space or 0 in case the device does not | |
248 | * support it. Possible values for @cap: | |
249 | * | |
f7625980 BH |
250 | * %PCI_CAP_ID_PM Power Management |
251 | * %PCI_CAP_ID_AGP Accelerated Graphics Port | |
252 | * %PCI_CAP_ID_VPD Vital Product Data | |
253 | * %PCI_CAP_ID_SLOTID Slot Identification | |
1da177e4 | 254 | * %PCI_CAP_ID_MSI Message Signalled Interrupts |
f7625980 | 255 | * %PCI_CAP_ID_CHSWP CompactPCI HotSwap |
1da177e4 LT |
256 | * %PCI_CAP_ID_PCIX PCI-X |
257 | * %PCI_CAP_ID_EXP PCI Express | |
258 | */ | |
259 | int pci_find_capability(struct pci_dev *dev, int cap) | |
260 | { | |
d3bac118 ME |
261 | int pos; |
262 | ||
263 | pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type); | |
264 | if (pos) | |
265 | pos = __pci_find_next_cap(dev->bus, dev->devfn, pos, cap); | |
266 | ||
267 | return pos; | |
1da177e4 | 268 | } |
b7fe9434 | 269 | EXPORT_SYMBOL(pci_find_capability); |
1da177e4 LT |
270 | |
271 | /** | |
f7625980 | 272 | * pci_bus_find_capability - query for devices' capabilities |
1da177e4 LT |
273 | * @bus: the PCI bus to query |
274 | * @devfn: PCI device to query | |
275 | * @cap: capability code | |
276 | * | |
277 | * Like pci_find_capability() but works for pci devices that do not have a | |
f7625980 | 278 | * pci_dev structure set up yet. |
1da177e4 LT |
279 | * |
280 | * Returns the address of the requested capability structure within the | |
281 | * device's PCI configuration space or 0 in case the device does not | |
282 | * support it. | |
283 | */ | |
284 | int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap) | |
285 | { | |
d3bac118 | 286 | int pos; |
1da177e4 LT |
287 | u8 hdr_type; |
288 | ||
289 | pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type); | |
290 | ||
d3bac118 ME |
291 | pos = __pci_bus_find_cap_start(bus, devfn, hdr_type & 0x7f); |
292 | if (pos) | |
293 | pos = __pci_find_next_cap(bus, devfn, pos, cap); | |
294 | ||
295 | return pos; | |
1da177e4 | 296 | } |
b7fe9434 | 297 | EXPORT_SYMBOL(pci_bus_find_capability); |
1da177e4 LT |
298 | |
299 | /** | |
44a9a36f | 300 | * pci_find_next_ext_capability - Find an extended capability |
1da177e4 | 301 | * @dev: PCI device to query |
44a9a36f | 302 | * @start: address at which to start looking (0 to start at beginning of list) |
1da177e4 LT |
303 | * @cap: capability code |
304 | * | |
44a9a36f | 305 | * Returns the address of the next matching extended capability structure |
1da177e4 | 306 | * within the device's PCI configuration space or 0 if the device does |
44a9a36f BH |
307 | * not support it. Some capabilities can occur several times, e.g., the |
308 | * vendor-specific capability, and this provides a way to find them all. | |
1da177e4 | 309 | */ |
44a9a36f | 310 | int pci_find_next_ext_capability(struct pci_dev *dev, int start, int cap) |
1da177e4 LT |
311 | { |
312 | u32 header; | |
557848c3 ZY |
313 | int ttl; |
314 | int pos = PCI_CFG_SPACE_SIZE; | |
1da177e4 | 315 | |
557848c3 ZY |
316 | /* minimum 8 bytes per capability */ |
317 | ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8; | |
318 | ||
319 | if (dev->cfg_size <= PCI_CFG_SPACE_SIZE) | |
1da177e4 LT |
320 | return 0; |
321 | ||
44a9a36f BH |
322 | if (start) |
323 | pos = start; | |
324 | ||
1da177e4 LT |
325 | if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL) |
326 | return 0; | |
327 | ||
328 | /* | |
329 | * If we have no capabilities, this is indicated by cap ID, | |
330 | * cap version and next pointer all being 0. | |
331 | */ | |
332 | if (header == 0) | |
333 | return 0; | |
334 | ||
335 | while (ttl-- > 0) { | |
44a9a36f | 336 | if (PCI_EXT_CAP_ID(header) == cap && pos != start) |
1da177e4 LT |
337 | return pos; |
338 | ||
339 | pos = PCI_EXT_CAP_NEXT(header); | |
557848c3 | 340 | if (pos < PCI_CFG_SPACE_SIZE) |
1da177e4 LT |
341 | break; |
342 | ||
343 | if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL) | |
344 | break; | |
345 | } | |
346 | ||
347 | return 0; | |
348 | } | |
44a9a36f BH |
349 | EXPORT_SYMBOL_GPL(pci_find_next_ext_capability); |
350 | ||
351 | /** | |
352 | * pci_find_ext_capability - Find an extended capability | |
353 | * @dev: PCI device to query | |
354 | * @cap: capability code | |
355 | * | |
356 | * Returns the address of the requested extended capability structure | |
357 | * within the device's PCI configuration space or 0 if the device does | |
358 | * not support it. Possible values for @cap: | |
359 | * | |
360 | * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting | |
361 | * %PCI_EXT_CAP_ID_VC Virtual Channel | |
362 | * %PCI_EXT_CAP_ID_DSN Device Serial Number | |
363 | * %PCI_EXT_CAP_ID_PWR Power Budgeting | |
364 | */ | |
365 | int pci_find_ext_capability(struct pci_dev *dev, int cap) | |
366 | { | |
367 | return pci_find_next_ext_capability(dev, 0, cap); | |
368 | } | |
3a720d72 | 369 | EXPORT_SYMBOL_GPL(pci_find_ext_capability); |
1da177e4 | 370 | |
687d5fe3 ME |
371 | static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap) |
372 | { | |
373 | int rc, ttl = PCI_FIND_CAP_TTL; | |
374 | u8 cap, mask; | |
375 | ||
376 | if (ht_cap == HT_CAPTYPE_SLAVE || ht_cap == HT_CAPTYPE_HOST) | |
377 | mask = HT_3BIT_CAP_MASK; | |
378 | else | |
379 | mask = HT_5BIT_CAP_MASK; | |
380 | ||
381 | pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, pos, | |
382 | PCI_CAP_ID_HT, &ttl); | |
383 | while (pos) { | |
384 | rc = pci_read_config_byte(dev, pos + 3, &cap); | |
385 | if (rc != PCIBIOS_SUCCESSFUL) | |
386 | return 0; | |
387 | ||
388 | if ((cap & mask) == ht_cap) | |
389 | return pos; | |
390 | ||
47a4d5be BG |
391 | pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, |
392 | pos + PCI_CAP_LIST_NEXT, | |
687d5fe3 ME |
393 | PCI_CAP_ID_HT, &ttl); |
394 | } | |
395 | ||
396 | return 0; | |
397 | } | |
398 | /** | |
399 | * pci_find_next_ht_capability - query a device's Hypertransport capabilities | |
400 | * @dev: PCI device to query | |
401 | * @pos: Position from which to continue searching | |
402 | * @ht_cap: Hypertransport capability code | |
403 | * | |
404 | * To be used in conjunction with pci_find_ht_capability() to search for | |
405 | * all capabilities matching @ht_cap. @pos should always be a value returned | |
406 | * from pci_find_ht_capability(). | |
407 | * | |
408 | * NB. To be 100% safe against broken PCI devices, the caller should take | |
409 | * steps to avoid an infinite loop. | |
410 | */ | |
411 | int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap) | |
412 | { | |
413 | return __pci_find_next_ht_cap(dev, pos + PCI_CAP_LIST_NEXT, ht_cap); | |
414 | } | |
415 | EXPORT_SYMBOL_GPL(pci_find_next_ht_capability); | |
416 | ||
417 | /** | |
418 | * pci_find_ht_capability - query a device's Hypertransport capabilities | |
419 | * @dev: PCI device to query | |
420 | * @ht_cap: Hypertransport capability code | |
421 | * | |
422 | * Tell if a device supports a given Hypertransport capability. | |
423 | * Returns an address within the device's PCI configuration space | |
424 | * or 0 in case the device does not support the request capability. | |
425 | * The address points to the PCI capability, of type PCI_CAP_ID_HT, | |
426 | * which has a Hypertransport capability matching @ht_cap. | |
427 | */ | |
428 | int pci_find_ht_capability(struct pci_dev *dev, int ht_cap) | |
429 | { | |
430 | int pos; | |
431 | ||
432 | pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type); | |
433 | if (pos) | |
434 | pos = __pci_find_next_ht_cap(dev, pos, ht_cap); | |
435 | ||
436 | return pos; | |
437 | } | |
438 | EXPORT_SYMBOL_GPL(pci_find_ht_capability); | |
439 | ||
1da177e4 LT |
440 | /** |
441 | * pci_find_parent_resource - return resource region of parent bus of given region | |
442 | * @dev: PCI device structure contains resources to be searched | |
443 | * @res: child resource record for which parent is sought | |
444 | * | |
445 | * For given resource region of given device, return the resource | |
f44116ae | 446 | * region of parent bus the given region is contained in. |
1da177e4 | 447 | */ |
3c78bc61 RD |
448 | struct resource *pci_find_parent_resource(const struct pci_dev *dev, |
449 | struct resource *res) | |
1da177e4 LT |
450 | { |
451 | const struct pci_bus *bus = dev->bus; | |
f44116ae | 452 | struct resource *r; |
1da177e4 | 453 | int i; |
1da177e4 | 454 | |
89a74ecc | 455 | pci_bus_for_each_resource(bus, r, i) { |
1da177e4 LT |
456 | if (!r) |
457 | continue; | |
f44116ae BH |
458 | if (res->start && resource_contains(r, res)) { |
459 | ||
460 | /* | |
461 | * If the window is prefetchable but the BAR is | |
462 | * not, the allocator made a mistake. | |
463 | */ | |
464 | if (r->flags & IORESOURCE_PREFETCH && | |
465 | !(res->flags & IORESOURCE_PREFETCH)) | |
466 | return NULL; | |
467 | ||
468 | /* | |
469 | * If we're below a transparent bridge, there may | |
470 | * be both a positively-decoded aperture and a | |
471 | * subtractively-decoded region that contain the BAR. | |
472 | * We want the positively-decoded one, so this depends | |
473 | * on pci_bus_for_each_resource() giving us those | |
474 | * first. | |
475 | */ | |
476 | return r; | |
477 | } | |
1da177e4 | 478 | } |
f44116ae | 479 | return NULL; |
1da177e4 | 480 | } |
b7fe9434 | 481 | EXPORT_SYMBOL(pci_find_parent_resource); |
1da177e4 | 482 | |
afd29f90 MW |
483 | /** |
484 | * pci_find_resource - Return matching PCI device resource | |
485 | * @dev: PCI device to query | |
486 | * @res: Resource to look for | |
487 | * | |
488 | * Goes over standard PCI resources (BARs) and checks if the given resource | |
489 | * is partially or fully contained in any of them. In that case the | |
490 | * matching resource is returned, %NULL otherwise. | |
491 | */ | |
492 | struct resource *pci_find_resource(struct pci_dev *dev, struct resource *res) | |
493 | { | |
494 | int i; | |
495 | ||
496 | for (i = 0; i < PCI_ROM_RESOURCE; i++) { | |
497 | struct resource *r = &dev->resource[i]; | |
498 | ||
499 | if (r->start && resource_contains(r, res)) | |
500 | return r; | |
501 | } | |
502 | ||
503 | return NULL; | |
504 | } | |
505 | EXPORT_SYMBOL(pci_find_resource); | |
506 | ||
c56d4450 HS |
507 | /** |
508 | * pci_find_pcie_root_port - return PCIe Root Port | |
509 | * @dev: PCI device to query | |
510 | * | |
511 | * Traverse up the parent chain and return the PCIe Root Port PCI Device | |
512 | * for a given PCI Device. | |
513 | */ | |
514 | struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev) | |
515 | { | |
516 | struct pci_dev *bridge, *highest_pcie_bridge = NULL; | |
517 | ||
518 | bridge = pci_upstream_bridge(dev); | |
519 | while (bridge && pci_is_pcie(bridge)) { | |
520 | highest_pcie_bridge = bridge; | |
521 | bridge = pci_upstream_bridge(bridge); | |
522 | } | |
523 | ||
524 | if (pci_pcie_type(highest_pcie_bridge) != PCI_EXP_TYPE_ROOT_PORT) | |
525 | return NULL; | |
526 | ||
527 | return highest_pcie_bridge; | |
528 | } | |
529 | EXPORT_SYMBOL(pci_find_pcie_root_port); | |
530 | ||
157e876f AW |
531 | /** |
532 | * pci_wait_for_pending - wait for @mask bit(s) to clear in status word @pos | |
533 | * @dev: the PCI device to operate on | |
534 | * @pos: config space offset of status word | |
535 | * @mask: mask of bit(s) to care about in status word | |
536 | * | |
537 | * Return 1 when mask bit(s) in status word clear, 0 otherwise. | |
538 | */ | |
539 | int pci_wait_for_pending(struct pci_dev *dev, int pos, u16 mask) | |
540 | { | |
541 | int i; | |
542 | ||
543 | /* Wait for Transaction Pending bit clean */ | |
544 | for (i = 0; i < 4; i++) { | |
545 | u16 status; | |
546 | if (i) | |
547 | msleep((1 << (i - 1)) * 100); | |
548 | ||
549 | pci_read_config_word(dev, pos, &status); | |
550 | if (!(status & mask)) | |
551 | return 1; | |
552 | } | |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
064b53db | 557 | /** |
70675e0b | 558 | * pci_restore_bars - restore a device's BAR values (e.g. after wake-up) |
064b53db JL |
559 | * @dev: PCI device to have its BARs restored |
560 | * | |
561 | * Restore the BAR values for a given device, so as to make it | |
562 | * accessible by its driver. | |
563 | */ | |
3c78bc61 | 564 | static void pci_restore_bars(struct pci_dev *dev) |
064b53db | 565 | { |
bc5f5a82 | 566 | int i; |
064b53db | 567 | |
bc5f5a82 | 568 | for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) |
14add80b | 569 | pci_update_resource(dev, i); |
064b53db JL |
570 | } |
571 | ||
299f2ffe | 572 | static const struct pci_platform_pm_ops *pci_platform_pm; |
961d9120 | 573 | |
299f2ffe | 574 | int pci_set_platform_pm(const struct pci_platform_pm_ops *ops) |
961d9120 | 575 | { |
cc7cc02b LW |
576 | if (!ops->is_manageable || !ops->set_state || !ops->get_state || |
577 | !ops->choose_state || !ops->sleep_wake || !ops->run_wake || | |
578 | !ops->need_resume) | |
961d9120 RW |
579 | return -EINVAL; |
580 | pci_platform_pm = ops; | |
581 | return 0; | |
582 | } | |
583 | ||
584 | static inline bool platform_pci_power_manageable(struct pci_dev *dev) | |
585 | { | |
586 | return pci_platform_pm ? pci_platform_pm->is_manageable(dev) : false; | |
587 | } | |
588 | ||
589 | static inline int platform_pci_set_power_state(struct pci_dev *dev, | |
3c78bc61 | 590 | pci_power_t t) |
961d9120 RW |
591 | { |
592 | return pci_platform_pm ? pci_platform_pm->set_state(dev, t) : -ENOSYS; | |
593 | } | |
594 | ||
cc7cc02b LW |
595 | static inline pci_power_t platform_pci_get_power_state(struct pci_dev *dev) |
596 | { | |
597 | return pci_platform_pm ? pci_platform_pm->get_state(dev) : PCI_UNKNOWN; | |
598 | } | |
599 | ||
961d9120 RW |
600 | static inline pci_power_t platform_pci_choose_state(struct pci_dev *dev) |
601 | { | |
602 | return pci_platform_pm ? | |
603 | pci_platform_pm->choose_state(dev) : PCI_POWER_ERROR; | |
604 | } | |
8f7020d3 | 605 | |
eb9d0fe4 RW |
606 | static inline int platform_pci_sleep_wake(struct pci_dev *dev, bool enable) |
607 | { | |
608 | return pci_platform_pm ? | |
609 | pci_platform_pm->sleep_wake(dev, enable) : -ENODEV; | |
610 | } | |
611 | ||
b67ea761 RW |
612 | static inline int platform_pci_run_wake(struct pci_dev *dev, bool enable) |
613 | { | |
614 | return pci_platform_pm ? | |
615 | pci_platform_pm->run_wake(dev, enable) : -ENODEV; | |
616 | } | |
617 | ||
bac2a909 RW |
618 | static inline bool platform_pci_need_resume(struct pci_dev *dev) |
619 | { | |
620 | return pci_platform_pm ? pci_platform_pm->need_resume(dev) : false; | |
621 | } | |
622 | ||
1da177e4 | 623 | /** |
44e4e66e RW |
624 | * pci_raw_set_power_state - Use PCI PM registers to set the power state of |
625 | * given PCI device | |
626 | * @dev: PCI device to handle. | |
44e4e66e | 627 | * @state: PCI power state (D0, D1, D2, D3hot) to put the device into. |
1da177e4 | 628 | * |
44e4e66e RW |
629 | * RETURN VALUE: |
630 | * -EINVAL if the requested state is invalid. | |
631 | * -EIO if device does not support PCI PM or its PM capabilities register has a | |
632 | * wrong version, or device doesn't support the requested state. | |
633 | * 0 if device already is in the requested state. | |
634 | * 0 if device's power state has been successfully changed. | |
1da177e4 | 635 | */ |
f00a20ef | 636 | static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state) |
1da177e4 | 637 | { |
337001b6 | 638 | u16 pmcsr; |
44e4e66e | 639 | bool need_restore = false; |
1da177e4 | 640 | |
4a865905 RW |
641 | /* Check if we're already there */ |
642 | if (dev->current_state == state) | |
643 | return 0; | |
644 | ||
337001b6 | 645 | if (!dev->pm_cap) |
cca03dec AL |
646 | return -EIO; |
647 | ||
44e4e66e RW |
648 | if (state < PCI_D0 || state > PCI_D3hot) |
649 | return -EINVAL; | |
650 | ||
1da177e4 | 651 | /* Validate current state: |
f7625980 | 652 | * Can enter D0 from any state, but if we can only go deeper |
1da177e4 LT |
653 | * to sleep if we're already in a low power state |
654 | */ | |
4a865905 | 655 | if (state != PCI_D0 && dev->current_state <= PCI_D3cold |
44e4e66e | 656 | && dev->current_state > state) { |
227f0647 RD |
657 | dev_err(&dev->dev, "invalid power transition (from state %d to %d)\n", |
658 | dev->current_state, state); | |
1da177e4 | 659 | return -EINVAL; |
44e4e66e | 660 | } |
1da177e4 | 661 | |
1da177e4 | 662 | /* check if this device supports the desired state */ |
337001b6 RW |
663 | if ((state == PCI_D1 && !dev->d1_support) |
664 | || (state == PCI_D2 && !dev->d2_support)) | |
3fe9d19f | 665 | return -EIO; |
1da177e4 | 666 | |
337001b6 | 667 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
064b53db | 668 | |
32a36585 | 669 | /* If we're (effectively) in D3, force entire word to 0. |
1da177e4 LT |
670 | * This doesn't affect PME_Status, disables PME_En, and |
671 | * sets PowerState to 0. | |
672 | */ | |
32a36585 | 673 | switch (dev->current_state) { |
d3535fbb JL |
674 | case PCI_D0: |
675 | case PCI_D1: | |
676 | case PCI_D2: | |
677 | pmcsr &= ~PCI_PM_CTRL_STATE_MASK; | |
678 | pmcsr |= state; | |
679 | break; | |
f62795f1 RW |
680 | case PCI_D3hot: |
681 | case PCI_D3cold: | |
32a36585 JL |
682 | case PCI_UNKNOWN: /* Boot-up */ |
683 | if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot | |
f00a20ef | 684 | && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET)) |
44e4e66e | 685 | need_restore = true; |
32a36585 | 686 | /* Fall-through: force to D0 */ |
32a36585 | 687 | default: |
d3535fbb | 688 | pmcsr = 0; |
32a36585 | 689 | break; |
1da177e4 LT |
690 | } |
691 | ||
692 | /* enter specified state */ | |
337001b6 | 693 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); |
1da177e4 LT |
694 | |
695 | /* Mandatory power management transition delays */ | |
696 | /* see PCI PM 1.1 5.6.1 table 18 */ | |
697 | if (state == PCI_D3hot || dev->current_state == PCI_D3hot) | |
1ae861e6 | 698 | pci_dev_d3_sleep(dev); |
1da177e4 | 699 | else if (state == PCI_D2 || dev->current_state == PCI_D2) |
aa8c6c93 | 700 | udelay(PCI_PM_D2_DELAY); |
1da177e4 | 701 | |
e13cdbd7 RW |
702 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
703 | dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); | |
704 | if (dev->current_state != state && printk_ratelimit()) | |
227f0647 RD |
705 | dev_info(&dev->dev, "Refused to change power state, currently in D%d\n", |
706 | dev->current_state); | |
064b53db | 707 | |
448bd857 HY |
708 | /* |
709 | * According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT | |
064b53db JL |
710 | * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning |
711 | * from D3hot to D0 _may_ perform an internal reset, thereby | |
712 | * going to "D0 Uninitialized" rather than "D0 Initialized". | |
713 | * For example, at least some versions of the 3c905B and the | |
714 | * 3c556B exhibit this behaviour. | |
715 | * | |
716 | * At least some laptop BIOSen (e.g. the Thinkpad T21) leave | |
717 | * devices in a D3hot state at boot. Consequently, we need to | |
718 | * restore at least the BARs so that the device will be | |
719 | * accessible to its driver. | |
720 | */ | |
721 | if (need_restore) | |
722 | pci_restore_bars(dev); | |
723 | ||
f00a20ef | 724 | if (dev->bus->self) |
7d715a6c SL |
725 | pcie_aspm_pm_state_change(dev->bus->self); |
726 | ||
1da177e4 LT |
727 | return 0; |
728 | } | |
729 | ||
44e4e66e | 730 | /** |
a6a64026 | 731 | * pci_update_current_state - Read power state of given device and cache it |
44e4e66e | 732 | * @dev: PCI device to handle. |
f06fc0b6 | 733 | * @state: State to cache in case the device doesn't have the PM capability |
a6a64026 LW |
734 | * |
735 | * The power state is read from the PMCSR register, which however is | |
736 | * inaccessible in D3cold. The platform firmware is therefore queried first | |
737 | * to detect accessibility of the register. In case the platform firmware | |
738 | * reports an incorrect state or the device isn't power manageable by the | |
739 | * platform at all, we try to detect D3cold by testing accessibility of the | |
740 | * vendor ID in config space. | |
44e4e66e | 741 | */ |
73410429 | 742 | void pci_update_current_state(struct pci_dev *dev, pci_power_t state) |
44e4e66e | 743 | { |
a6a64026 LW |
744 | if (platform_pci_get_power_state(dev) == PCI_D3cold || |
745 | !pci_device_is_present(dev)) { | |
746 | dev->current_state = PCI_D3cold; | |
747 | } else if (dev->pm_cap) { | |
44e4e66e RW |
748 | u16 pmcsr; |
749 | ||
337001b6 | 750 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
44e4e66e | 751 | dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); |
f06fc0b6 RW |
752 | } else { |
753 | dev->current_state = state; | |
44e4e66e RW |
754 | } |
755 | } | |
756 | ||
db288c9c RW |
757 | /** |
758 | * pci_power_up - Put the given device into D0 forcibly | |
759 | * @dev: PCI device to power up | |
760 | */ | |
761 | void pci_power_up(struct pci_dev *dev) | |
762 | { | |
763 | if (platform_pci_power_manageable(dev)) | |
764 | platform_pci_set_power_state(dev, PCI_D0); | |
765 | ||
766 | pci_raw_set_power_state(dev, PCI_D0); | |
767 | pci_update_current_state(dev, PCI_D0); | |
768 | } | |
769 | ||
0e5dd46b RW |
770 | /** |
771 | * pci_platform_power_transition - Use platform to change device power state | |
772 | * @dev: PCI device to handle. | |
773 | * @state: State to put the device into. | |
774 | */ | |
775 | static int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state) | |
776 | { | |
777 | int error; | |
778 | ||
779 | if (platform_pci_power_manageable(dev)) { | |
780 | error = platform_pci_set_power_state(dev, state); | |
781 | if (!error) | |
782 | pci_update_current_state(dev, state); | |
769ba721 | 783 | } else |
0e5dd46b | 784 | error = -ENODEV; |
769ba721 RW |
785 | |
786 | if (error && !dev->pm_cap) /* Fall back to PCI_D0 */ | |
787 | dev->current_state = PCI_D0; | |
0e5dd46b RW |
788 | |
789 | return error; | |
790 | } | |
791 | ||
0b950f0f SH |
792 | /** |
793 | * pci_wakeup - Wake up a PCI device | |
794 | * @pci_dev: Device to handle. | |
795 | * @ign: ignored parameter | |
796 | */ | |
797 | static int pci_wakeup(struct pci_dev *pci_dev, void *ign) | |
798 | { | |
799 | pci_wakeup_event(pci_dev); | |
800 | pm_request_resume(&pci_dev->dev); | |
801 | return 0; | |
802 | } | |
803 | ||
804 | /** | |
805 | * pci_wakeup_bus - Walk given bus and wake up devices on it | |
806 | * @bus: Top bus of the subtree to walk. | |
807 | */ | |
808 | static void pci_wakeup_bus(struct pci_bus *bus) | |
809 | { | |
810 | if (bus) | |
811 | pci_walk_bus(bus, pci_wakeup, NULL); | |
812 | } | |
813 | ||
0e5dd46b RW |
814 | /** |
815 | * __pci_start_power_transition - Start power transition of a PCI device | |
816 | * @dev: PCI device to handle. | |
817 | * @state: State to put the device into. | |
818 | */ | |
819 | static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state) | |
820 | { | |
448bd857 | 821 | if (state == PCI_D0) { |
0e5dd46b | 822 | pci_platform_power_transition(dev, PCI_D0); |
448bd857 HY |
823 | /* |
824 | * Mandatory power management transition delays, see | |
825 | * PCI Express Base Specification Revision 2.0 Section | |
826 | * 6.6.1: Conventional Reset. Do not delay for | |
827 | * devices powered on/off by corresponding bridge, | |
828 | * because have already delayed for the bridge. | |
829 | */ | |
830 | if (dev->runtime_d3cold) { | |
50b2b540 AH |
831 | if (dev->d3cold_delay) |
832 | msleep(dev->d3cold_delay); | |
448bd857 HY |
833 | /* |
834 | * When powering on a bridge from D3cold, the | |
835 | * whole hierarchy may be powered on into | |
836 | * D0uninitialized state, resume them to give | |
837 | * them a chance to suspend again | |
838 | */ | |
839 | pci_wakeup_bus(dev->subordinate); | |
840 | } | |
841 | } | |
842 | } | |
843 | ||
844 | /** | |
845 | * __pci_dev_set_current_state - Set current state of a PCI device | |
846 | * @dev: Device to handle | |
847 | * @data: pointer to state to be set | |
848 | */ | |
849 | static int __pci_dev_set_current_state(struct pci_dev *dev, void *data) | |
850 | { | |
851 | pci_power_t state = *(pci_power_t *)data; | |
852 | ||
853 | dev->current_state = state; | |
854 | return 0; | |
855 | } | |
856 | ||
857 | /** | |
858 | * __pci_bus_set_current_state - Walk given bus and set current state of devices | |
859 | * @bus: Top bus of the subtree to walk. | |
860 | * @state: state to be set | |
861 | */ | |
862 | static void __pci_bus_set_current_state(struct pci_bus *bus, pci_power_t state) | |
863 | { | |
864 | if (bus) | |
865 | pci_walk_bus(bus, __pci_dev_set_current_state, &state); | |
0e5dd46b RW |
866 | } |
867 | ||
868 | /** | |
869 | * __pci_complete_power_transition - Complete power transition of a PCI device | |
870 | * @dev: PCI device to handle. | |
871 | * @state: State to put the device into. | |
872 | * | |
873 | * This function should not be called directly by device drivers. | |
874 | */ | |
875 | int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state) | |
876 | { | |
448bd857 HY |
877 | int ret; |
878 | ||
db288c9c | 879 | if (state <= PCI_D0) |
448bd857 HY |
880 | return -EINVAL; |
881 | ret = pci_platform_power_transition(dev, state); | |
882 | /* Power off the bridge may power off the whole hierarchy */ | |
883 | if (!ret && state == PCI_D3cold) | |
884 | __pci_bus_set_current_state(dev->subordinate, PCI_D3cold); | |
885 | return ret; | |
0e5dd46b RW |
886 | } |
887 | EXPORT_SYMBOL_GPL(__pci_complete_power_transition); | |
888 | ||
44e4e66e RW |
889 | /** |
890 | * pci_set_power_state - Set the power state of a PCI device | |
891 | * @dev: PCI device to handle. | |
892 | * @state: PCI power state (D0, D1, D2, D3hot) to put the device into. | |
893 | * | |
877d0310 | 894 | * Transition a device to a new power state, using the platform firmware and/or |
44e4e66e RW |
895 | * the device's PCI PM registers. |
896 | * | |
897 | * RETURN VALUE: | |
898 | * -EINVAL if the requested state is invalid. | |
899 | * -EIO if device does not support PCI PM or its PM capabilities register has a | |
900 | * wrong version, or device doesn't support the requested state. | |
901 | * 0 if device already is in the requested state. | |
902 | * 0 if device's power state has been successfully changed. | |
903 | */ | |
904 | int pci_set_power_state(struct pci_dev *dev, pci_power_t state) | |
905 | { | |
337001b6 | 906 | int error; |
44e4e66e RW |
907 | |
908 | /* bound the state we're entering */ | |
448bd857 HY |
909 | if (state > PCI_D3cold) |
910 | state = PCI_D3cold; | |
44e4e66e RW |
911 | else if (state < PCI_D0) |
912 | state = PCI_D0; | |
913 | else if ((state == PCI_D1 || state == PCI_D2) && pci_no_d1d2(dev)) | |
914 | /* | |
915 | * If the device or the parent bridge do not support PCI PM, | |
916 | * ignore the request if we're doing anything other than putting | |
917 | * it into D0 (which would only happen on boot). | |
918 | */ | |
919 | return 0; | |
920 | ||
db288c9c RW |
921 | /* Check if we're already there */ |
922 | if (dev->current_state == state) | |
923 | return 0; | |
924 | ||
0e5dd46b RW |
925 | __pci_start_power_transition(dev, state); |
926 | ||
979b1791 AC |
927 | /* This device is quirked not to be put into D3, so |
928 | don't put it in D3 */ | |
448bd857 | 929 | if (state >= PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3)) |
979b1791 | 930 | return 0; |
44e4e66e | 931 | |
448bd857 HY |
932 | /* |
933 | * To put device in D3cold, we put device into D3hot in native | |
934 | * way, then put device into D3cold with platform ops | |
935 | */ | |
936 | error = pci_raw_set_power_state(dev, state > PCI_D3hot ? | |
937 | PCI_D3hot : state); | |
44e4e66e | 938 | |
0e5dd46b RW |
939 | if (!__pci_complete_power_transition(dev, state)) |
940 | error = 0; | |
44e4e66e RW |
941 | |
942 | return error; | |
943 | } | |
b7fe9434 | 944 | EXPORT_SYMBOL(pci_set_power_state); |
44e4e66e | 945 | |
1da177e4 LT |
946 | /** |
947 | * pci_choose_state - Choose the power state of a PCI device | |
948 | * @dev: PCI device to be suspended | |
949 | * @state: target sleep state for the whole system. This is the value | |
950 | * that is passed to suspend() function. | |
951 | * | |
952 | * Returns PCI power state suitable for given device and given system | |
953 | * message. | |
954 | */ | |
955 | ||
956 | pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state) | |
957 | { | |
ab826ca4 | 958 | pci_power_t ret; |
0f64474b | 959 | |
728cdb75 | 960 | if (!dev->pm_cap) |
1da177e4 LT |
961 | return PCI_D0; |
962 | ||
961d9120 RW |
963 | ret = platform_pci_choose_state(dev); |
964 | if (ret != PCI_POWER_ERROR) | |
965 | return ret; | |
ca078bae PM |
966 | |
967 | switch (state.event) { | |
968 | case PM_EVENT_ON: | |
969 | return PCI_D0; | |
970 | case PM_EVENT_FREEZE: | |
b887d2e6 DB |
971 | case PM_EVENT_PRETHAW: |
972 | /* REVISIT both freeze and pre-thaw "should" use D0 */ | |
ca078bae | 973 | case PM_EVENT_SUSPEND: |
3a2d5b70 | 974 | case PM_EVENT_HIBERNATE: |
ca078bae | 975 | return PCI_D3hot; |
1da177e4 | 976 | default: |
80ccba11 BH |
977 | dev_info(&dev->dev, "unrecognized suspend event %d\n", |
978 | state.event); | |
1da177e4 LT |
979 | BUG(); |
980 | } | |
981 | return PCI_D0; | |
982 | } | |
1da177e4 LT |
983 | EXPORT_SYMBOL(pci_choose_state); |
984 | ||
89858517 YZ |
985 | #define PCI_EXP_SAVE_REGS 7 |
986 | ||
fd0f7f73 AW |
987 | static struct pci_cap_saved_state *_pci_find_saved_cap(struct pci_dev *pci_dev, |
988 | u16 cap, bool extended) | |
34a4876e YL |
989 | { |
990 | struct pci_cap_saved_state *tmp; | |
34a4876e | 991 | |
b67bfe0d | 992 | hlist_for_each_entry(tmp, &pci_dev->saved_cap_space, next) { |
fd0f7f73 | 993 | if (tmp->cap.cap_extended == extended && tmp->cap.cap_nr == cap) |
34a4876e YL |
994 | return tmp; |
995 | } | |
996 | return NULL; | |
997 | } | |
998 | ||
fd0f7f73 AW |
999 | struct pci_cap_saved_state *pci_find_saved_cap(struct pci_dev *dev, char cap) |
1000 | { | |
1001 | return _pci_find_saved_cap(dev, cap, false); | |
1002 | } | |
1003 | ||
1004 | struct pci_cap_saved_state *pci_find_saved_ext_cap(struct pci_dev *dev, u16 cap) | |
1005 | { | |
1006 | return _pci_find_saved_cap(dev, cap, true); | |
1007 | } | |
1008 | ||
b56a5a23 MT |
1009 | static int pci_save_pcie_state(struct pci_dev *dev) |
1010 | { | |
59875ae4 | 1011 | int i = 0; |
b56a5a23 MT |
1012 | struct pci_cap_saved_state *save_state; |
1013 | u16 *cap; | |
1014 | ||
59875ae4 | 1015 | if (!pci_is_pcie(dev)) |
b56a5a23 MT |
1016 | return 0; |
1017 | ||
9f35575d | 1018 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP); |
b56a5a23 | 1019 | if (!save_state) { |
e496b617 | 1020 | dev_err(&dev->dev, "buffer not found in %s\n", __func__); |
b56a5a23 MT |
1021 | return -ENOMEM; |
1022 | } | |
63f4898a | 1023 | |
59875ae4 JL |
1024 | cap = (u16 *)&save_state->cap.data[0]; |
1025 | pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &cap[i++]); | |
1026 | pcie_capability_read_word(dev, PCI_EXP_LNKCTL, &cap[i++]); | |
1027 | pcie_capability_read_word(dev, PCI_EXP_SLTCTL, &cap[i++]); | |
1028 | pcie_capability_read_word(dev, PCI_EXP_RTCTL, &cap[i++]); | |
1029 | pcie_capability_read_word(dev, PCI_EXP_DEVCTL2, &cap[i++]); | |
1030 | pcie_capability_read_word(dev, PCI_EXP_LNKCTL2, &cap[i++]); | |
1031 | pcie_capability_read_word(dev, PCI_EXP_SLTCTL2, &cap[i++]); | |
9cb604ed | 1032 | |
b56a5a23 MT |
1033 | return 0; |
1034 | } | |
1035 | ||
1036 | static void pci_restore_pcie_state(struct pci_dev *dev) | |
1037 | { | |
59875ae4 | 1038 | int i = 0; |
b56a5a23 MT |
1039 | struct pci_cap_saved_state *save_state; |
1040 | u16 *cap; | |
1041 | ||
1042 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP); | |
59875ae4 | 1043 | if (!save_state) |
9cb604ed MS |
1044 | return; |
1045 | ||
59875ae4 JL |
1046 | cap = (u16 *)&save_state->cap.data[0]; |
1047 | pcie_capability_write_word(dev, PCI_EXP_DEVCTL, cap[i++]); | |
1048 | pcie_capability_write_word(dev, PCI_EXP_LNKCTL, cap[i++]); | |
1049 | pcie_capability_write_word(dev, PCI_EXP_SLTCTL, cap[i++]); | |
1050 | pcie_capability_write_word(dev, PCI_EXP_RTCTL, cap[i++]); | |
1051 | pcie_capability_write_word(dev, PCI_EXP_DEVCTL2, cap[i++]); | |
1052 | pcie_capability_write_word(dev, PCI_EXP_LNKCTL2, cap[i++]); | |
1053 | pcie_capability_write_word(dev, PCI_EXP_SLTCTL2, cap[i++]); | |
b56a5a23 MT |
1054 | } |
1055 | ||
cc692a5f SH |
1056 | |
1057 | static int pci_save_pcix_state(struct pci_dev *dev) | |
1058 | { | |
63f4898a | 1059 | int pos; |
cc692a5f | 1060 | struct pci_cap_saved_state *save_state; |
cc692a5f SH |
1061 | |
1062 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
0a1a9b49 | 1063 | if (!pos) |
cc692a5f SH |
1064 | return 0; |
1065 | ||
f34303de | 1066 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX); |
cc692a5f | 1067 | if (!save_state) { |
e496b617 | 1068 | dev_err(&dev->dev, "buffer not found in %s\n", __func__); |
cc692a5f SH |
1069 | return -ENOMEM; |
1070 | } | |
cc692a5f | 1071 | |
24a4742f AW |
1072 | pci_read_config_word(dev, pos + PCI_X_CMD, |
1073 | (u16 *)save_state->cap.data); | |
63f4898a | 1074 | |
cc692a5f SH |
1075 | return 0; |
1076 | } | |
1077 | ||
1078 | static void pci_restore_pcix_state(struct pci_dev *dev) | |
1079 | { | |
1080 | int i = 0, pos; | |
1081 | struct pci_cap_saved_state *save_state; | |
1082 | u16 *cap; | |
1083 | ||
1084 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX); | |
1085 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
0a1a9b49 | 1086 | if (!save_state || !pos) |
cc692a5f | 1087 | return; |
24a4742f | 1088 | cap = (u16 *)&save_state->cap.data[0]; |
cc692a5f SH |
1089 | |
1090 | pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]); | |
cc692a5f SH |
1091 | } |
1092 | ||
1093 | ||
1da177e4 LT |
1094 | /** |
1095 | * pci_save_state - save the PCI configuration space of a device before suspending | |
1096 | * @dev: - PCI device that we're dealing with | |
1da177e4 | 1097 | */ |
3c78bc61 | 1098 | int pci_save_state(struct pci_dev *dev) |
1da177e4 LT |
1099 | { |
1100 | int i; | |
1101 | /* XXX: 100% dword access ok here? */ | |
1102 | for (i = 0; i < 16; i++) | |
9e0b5b2c | 1103 | pci_read_config_dword(dev, i * 4, &dev->saved_config_space[i]); |
aa8c6c93 | 1104 | dev->state_saved = true; |
79e50e72 QL |
1105 | |
1106 | i = pci_save_pcie_state(dev); | |
1107 | if (i != 0) | |
b56a5a23 | 1108 | return i; |
79e50e72 QL |
1109 | |
1110 | i = pci_save_pcix_state(dev); | |
1111 | if (i != 0) | |
cc692a5f | 1112 | return i; |
79e50e72 | 1113 | |
754834b9 | 1114 | return pci_save_vc_state(dev); |
1da177e4 | 1115 | } |
b7fe9434 | 1116 | EXPORT_SYMBOL(pci_save_state); |
1da177e4 | 1117 | |
ebfc5b80 RW |
1118 | static void pci_restore_config_dword(struct pci_dev *pdev, int offset, |
1119 | u32 saved_val, int retry) | |
1120 | { | |
1121 | u32 val; | |
1122 | ||
1123 | pci_read_config_dword(pdev, offset, &val); | |
1124 | if (val == saved_val) | |
1125 | return; | |
1126 | ||
1127 | for (;;) { | |
227f0647 RD |
1128 | dev_dbg(&pdev->dev, "restoring config space at offset %#x (was %#x, writing %#x)\n", |
1129 | offset, val, saved_val); | |
ebfc5b80 RW |
1130 | pci_write_config_dword(pdev, offset, saved_val); |
1131 | if (retry-- <= 0) | |
1132 | return; | |
1133 | ||
1134 | pci_read_config_dword(pdev, offset, &val); | |
1135 | if (val == saved_val) | |
1136 | return; | |
1137 | ||
1138 | mdelay(1); | |
1139 | } | |
1140 | } | |
1141 | ||
a6cb9ee7 RW |
1142 | static void pci_restore_config_space_range(struct pci_dev *pdev, |
1143 | int start, int end, int retry) | |
ebfc5b80 RW |
1144 | { |
1145 | int index; | |
1146 | ||
1147 | for (index = end; index >= start; index--) | |
1148 | pci_restore_config_dword(pdev, 4 * index, | |
1149 | pdev->saved_config_space[index], | |
1150 | retry); | |
1151 | } | |
1152 | ||
a6cb9ee7 RW |
1153 | static void pci_restore_config_space(struct pci_dev *pdev) |
1154 | { | |
1155 | if (pdev->hdr_type == PCI_HEADER_TYPE_NORMAL) { | |
1156 | pci_restore_config_space_range(pdev, 10, 15, 0); | |
1157 | /* Restore BARs before the command register. */ | |
1158 | pci_restore_config_space_range(pdev, 4, 9, 10); | |
1159 | pci_restore_config_space_range(pdev, 0, 3, 0); | |
1160 | } else { | |
1161 | pci_restore_config_space_range(pdev, 0, 15, 0); | |
1162 | } | |
1163 | } | |
1164 | ||
f7625980 | 1165 | /** |
1da177e4 LT |
1166 | * pci_restore_state - Restore the saved state of a PCI device |
1167 | * @dev: - PCI device that we're dealing with | |
1da177e4 | 1168 | */ |
1d3c16a8 | 1169 | void pci_restore_state(struct pci_dev *dev) |
1da177e4 | 1170 | { |
c82f63e4 | 1171 | if (!dev->state_saved) |
1d3c16a8 | 1172 | return; |
4b77b0a2 | 1173 | |
b56a5a23 MT |
1174 | /* PCI Express register must be restored first */ |
1175 | pci_restore_pcie_state(dev); | |
1900ca13 | 1176 | pci_restore_ats_state(dev); |
425c1b22 | 1177 | pci_restore_vc_state(dev); |
b56a5a23 | 1178 | |
b07461a8 TI |
1179 | pci_cleanup_aer_error_status_regs(dev); |
1180 | ||
a6cb9ee7 | 1181 | pci_restore_config_space(dev); |
ebfc5b80 | 1182 | |
cc692a5f | 1183 | pci_restore_pcix_state(dev); |
41017f0c | 1184 | pci_restore_msi_state(dev); |
ccbc175a AD |
1185 | |
1186 | /* Restore ACS and IOV configuration state */ | |
1187 | pci_enable_acs(dev); | |
8c5cdb6a | 1188 | pci_restore_iov_state(dev); |
8fed4b65 | 1189 | |
4b77b0a2 | 1190 | dev->state_saved = false; |
1da177e4 | 1191 | } |
b7fe9434 | 1192 | EXPORT_SYMBOL(pci_restore_state); |
1da177e4 | 1193 | |
ffbdd3f7 AW |
1194 | struct pci_saved_state { |
1195 | u32 config_space[16]; | |
1196 | struct pci_cap_saved_data cap[0]; | |
1197 | }; | |
1198 | ||
1199 | /** | |
1200 | * pci_store_saved_state - Allocate and return an opaque struct containing | |
1201 | * the device saved state. | |
1202 | * @dev: PCI device that we're dealing with | |
1203 | * | |
f7625980 | 1204 | * Return NULL if no state or error. |
ffbdd3f7 AW |
1205 | */ |
1206 | struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev) | |
1207 | { | |
1208 | struct pci_saved_state *state; | |
1209 | struct pci_cap_saved_state *tmp; | |
1210 | struct pci_cap_saved_data *cap; | |
ffbdd3f7 AW |
1211 | size_t size; |
1212 | ||
1213 | if (!dev->state_saved) | |
1214 | return NULL; | |
1215 | ||
1216 | size = sizeof(*state) + sizeof(struct pci_cap_saved_data); | |
1217 | ||
b67bfe0d | 1218 | hlist_for_each_entry(tmp, &dev->saved_cap_space, next) |
ffbdd3f7 AW |
1219 | size += sizeof(struct pci_cap_saved_data) + tmp->cap.size; |
1220 | ||
1221 | state = kzalloc(size, GFP_KERNEL); | |
1222 | if (!state) | |
1223 | return NULL; | |
1224 | ||
1225 | memcpy(state->config_space, dev->saved_config_space, | |
1226 | sizeof(state->config_space)); | |
1227 | ||
1228 | cap = state->cap; | |
b67bfe0d | 1229 | hlist_for_each_entry(tmp, &dev->saved_cap_space, next) { |
ffbdd3f7 AW |
1230 | size_t len = sizeof(struct pci_cap_saved_data) + tmp->cap.size; |
1231 | memcpy(cap, &tmp->cap, len); | |
1232 | cap = (struct pci_cap_saved_data *)((u8 *)cap + len); | |
1233 | } | |
1234 | /* Empty cap_save terminates list */ | |
1235 | ||
1236 | return state; | |
1237 | } | |
1238 | EXPORT_SYMBOL_GPL(pci_store_saved_state); | |
1239 | ||
1240 | /** | |
1241 | * pci_load_saved_state - Reload the provided save state into struct pci_dev. | |
1242 | * @dev: PCI device that we're dealing with | |
1243 | * @state: Saved state returned from pci_store_saved_state() | |
1244 | */ | |
98d9b271 KRW |
1245 | int pci_load_saved_state(struct pci_dev *dev, |
1246 | struct pci_saved_state *state) | |
ffbdd3f7 AW |
1247 | { |
1248 | struct pci_cap_saved_data *cap; | |
1249 | ||
1250 | dev->state_saved = false; | |
1251 | ||
1252 | if (!state) | |
1253 | return 0; | |
1254 | ||
1255 | memcpy(dev->saved_config_space, state->config_space, | |
1256 | sizeof(state->config_space)); | |
1257 | ||
1258 | cap = state->cap; | |
1259 | while (cap->size) { | |
1260 | struct pci_cap_saved_state *tmp; | |
1261 | ||
fd0f7f73 | 1262 | tmp = _pci_find_saved_cap(dev, cap->cap_nr, cap->cap_extended); |
ffbdd3f7 AW |
1263 | if (!tmp || tmp->cap.size != cap->size) |
1264 | return -EINVAL; | |
1265 | ||
1266 | memcpy(tmp->cap.data, cap->data, tmp->cap.size); | |
1267 | cap = (struct pci_cap_saved_data *)((u8 *)cap + | |
1268 | sizeof(struct pci_cap_saved_data) + cap->size); | |
1269 | } | |
1270 | ||
1271 | dev->state_saved = true; | |
1272 | return 0; | |
1273 | } | |
98d9b271 | 1274 | EXPORT_SYMBOL_GPL(pci_load_saved_state); |
ffbdd3f7 AW |
1275 | |
1276 | /** | |
1277 | * pci_load_and_free_saved_state - Reload the save state pointed to by state, | |
1278 | * and free the memory allocated for it. | |
1279 | * @dev: PCI device that we're dealing with | |
1280 | * @state: Pointer to saved state returned from pci_store_saved_state() | |
1281 | */ | |
1282 | int pci_load_and_free_saved_state(struct pci_dev *dev, | |
1283 | struct pci_saved_state **state) | |
1284 | { | |
1285 | int ret = pci_load_saved_state(dev, *state); | |
1286 | kfree(*state); | |
1287 | *state = NULL; | |
1288 | return ret; | |
1289 | } | |
1290 | EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state); | |
1291 | ||
8a9d5609 BH |
1292 | int __weak pcibios_enable_device(struct pci_dev *dev, int bars) |
1293 | { | |
1294 | return pci_enable_resources(dev, bars); | |
1295 | } | |
1296 | ||
38cc1302 HS |
1297 | static int do_pci_enable_device(struct pci_dev *dev, int bars) |
1298 | { | |
1299 | int err; | |
1f6ae47e | 1300 | struct pci_dev *bridge; |
1e2571a7 BH |
1301 | u16 cmd; |
1302 | u8 pin; | |
38cc1302 HS |
1303 | |
1304 | err = pci_set_power_state(dev, PCI_D0); | |
1305 | if (err < 0 && err != -EIO) | |
1306 | return err; | |
1f6ae47e VS |
1307 | |
1308 | bridge = pci_upstream_bridge(dev); | |
1309 | if (bridge) | |
1310 | pcie_aspm_powersave_config_link(bridge); | |
1311 | ||
38cc1302 HS |
1312 | err = pcibios_enable_device(dev, bars); |
1313 | if (err < 0) | |
1314 | return err; | |
1315 | pci_fixup_device(pci_fixup_enable, dev); | |
1316 | ||
866d5417 BH |
1317 | if (dev->msi_enabled || dev->msix_enabled) |
1318 | return 0; | |
1319 | ||
1e2571a7 BH |
1320 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); |
1321 | if (pin) { | |
1322 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
1323 | if (cmd & PCI_COMMAND_INTX_DISABLE) | |
1324 | pci_write_config_word(dev, PCI_COMMAND, | |
1325 | cmd & ~PCI_COMMAND_INTX_DISABLE); | |
1326 | } | |
1327 | ||
38cc1302 HS |
1328 | return 0; |
1329 | } | |
1330 | ||
1331 | /** | |
0b62e13b | 1332 | * pci_reenable_device - Resume abandoned device |
38cc1302 HS |
1333 | * @dev: PCI device to be resumed |
1334 | * | |
1335 | * Note this function is a backend of pci_default_resume and is not supposed | |
1336 | * to be called by normal code, write proper resume handler and use it instead. | |
1337 | */ | |
0b62e13b | 1338 | int pci_reenable_device(struct pci_dev *dev) |
38cc1302 | 1339 | { |
296ccb08 | 1340 | if (pci_is_enabled(dev)) |
38cc1302 HS |
1341 | return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1); |
1342 | return 0; | |
1343 | } | |
b7fe9434 | 1344 | EXPORT_SYMBOL(pci_reenable_device); |
38cc1302 | 1345 | |
928bea96 YL |
1346 | static void pci_enable_bridge(struct pci_dev *dev) |
1347 | { | |
79272138 | 1348 | struct pci_dev *bridge; |
928bea96 YL |
1349 | int retval; |
1350 | ||
79272138 BH |
1351 | bridge = pci_upstream_bridge(dev); |
1352 | if (bridge) | |
1353 | pci_enable_bridge(bridge); | |
928bea96 | 1354 | |
cf3e1feb | 1355 | if (pci_is_enabled(dev)) { |
fbeeb822 | 1356 | if (!dev->is_busmaster) |
cf3e1feb | 1357 | pci_set_master(dev); |
928bea96 | 1358 | return; |
cf3e1feb YL |
1359 | } |
1360 | ||
928bea96 YL |
1361 | retval = pci_enable_device(dev); |
1362 | if (retval) | |
1363 | dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", | |
1364 | retval); | |
1365 | pci_set_master(dev); | |
1366 | } | |
1367 | ||
b4b4fbba | 1368 | static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags) |
1da177e4 | 1369 | { |
79272138 | 1370 | struct pci_dev *bridge; |
1da177e4 | 1371 | int err; |
b718989d | 1372 | int i, bars = 0; |
1da177e4 | 1373 | |
97c145f7 JB |
1374 | /* |
1375 | * Power state could be unknown at this point, either due to a fresh | |
1376 | * boot or a device removal call. So get the current power state | |
1377 | * so that things like MSI message writing will behave as expected | |
1378 | * (e.g. if the device really is in D0 at enable time). | |
1379 | */ | |
1380 | if (dev->pm_cap) { | |
1381 | u16 pmcsr; | |
1382 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); | |
1383 | dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); | |
1384 | } | |
1385 | ||
cc7ba39b | 1386 | if (atomic_inc_return(&dev->enable_cnt) > 1) |
9fb625c3 HS |
1387 | return 0; /* already enabled */ |
1388 | ||
79272138 BH |
1389 | bridge = pci_upstream_bridge(dev); |
1390 | if (bridge) | |
1391 | pci_enable_bridge(bridge); | |
928bea96 | 1392 | |
497f16f2 YL |
1393 | /* only skip sriov related */ |
1394 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) | |
1395 | if (dev->resource[i].flags & flags) | |
1396 | bars |= (1 << i); | |
1397 | for (i = PCI_BRIDGE_RESOURCES; i < DEVICE_COUNT_RESOURCE; i++) | |
b718989d BH |
1398 | if (dev->resource[i].flags & flags) |
1399 | bars |= (1 << i); | |
1400 | ||
38cc1302 | 1401 | err = do_pci_enable_device(dev, bars); |
95a62965 | 1402 | if (err < 0) |
38cc1302 | 1403 | atomic_dec(&dev->enable_cnt); |
9fb625c3 | 1404 | return err; |
1da177e4 LT |
1405 | } |
1406 | ||
b718989d BH |
1407 | /** |
1408 | * pci_enable_device_io - Initialize a device for use with IO space | |
1409 | * @dev: PCI device to be initialized | |
1410 | * | |
1411 | * Initialize device before it's used by a driver. Ask low-level code | |
1412 | * to enable I/O resources. Wake up the device if it was suspended. | |
1413 | * Beware, this function can fail. | |
1414 | */ | |
1415 | int pci_enable_device_io(struct pci_dev *dev) | |
1416 | { | |
b4b4fbba | 1417 | return pci_enable_device_flags(dev, IORESOURCE_IO); |
b718989d | 1418 | } |
b7fe9434 | 1419 | EXPORT_SYMBOL(pci_enable_device_io); |
b718989d BH |
1420 | |
1421 | /** | |
1422 | * pci_enable_device_mem - Initialize a device for use with Memory space | |
1423 | * @dev: PCI device to be initialized | |
1424 | * | |
1425 | * Initialize device before it's used by a driver. Ask low-level code | |
1426 | * to enable Memory resources. Wake up the device if it was suspended. | |
1427 | * Beware, this function can fail. | |
1428 | */ | |
1429 | int pci_enable_device_mem(struct pci_dev *dev) | |
1430 | { | |
b4b4fbba | 1431 | return pci_enable_device_flags(dev, IORESOURCE_MEM); |
b718989d | 1432 | } |
b7fe9434 | 1433 | EXPORT_SYMBOL(pci_enable_device_mem); |
b718989d | 1434 | |
bae94d02 IPG |
1435 | /** |
1436 | * pci_enable_device - Initialize device before it's used by a driver. | |
1437 | * @dev: PCI device to be initialized | |
1438 | * | |
1439 | * Initialize device before it's used by a driver. Ask low-level code | |
1440 | * to enable I/O and memory. Wake up the device if it was suspended. | |
1441 | * Beware, this function can fail. | |
1442 | * | |
1443 | * Note we don't actually enable the device many times if we call | |
1444 | * this function repeatedly (we just increment the count). | |
1445 | */ | |
1446 | int pci_enable_device(struct pci_dev *dev) | |
1447 | { | |
b4b4fbba | 1448 | return pci_enable_device_flags(dev, IORESOURCE_MEM | IORESOURCE_IO); |
bae94d02 | 1449 | } |
b7fe9434 | 1450 | EXPORT_SYMBOL(pci_enable_device); |
bae94d02 | 1451 | |
9ac7849e TH |
1452 | /* |
1453 | * Managed PCI resources. This manages device on/off, intx/msi/msix | |
1454 | * on/off and BAR regions. pci_dev itself records msi/msix status, so | |
1455 | * there's no need to track it separately. pci_devres is initialized | |
1456 | * when a device is enabled using managed PCI device enable interface. | |
1457 | */ | |
1458 | struct pci_devres { | |
7f375f32 TH |
1459 | unsigned int enabled:1; |
1460 | unsigned int pinned:1; | |
9ac7849e TH |
1461 | unsigned int orig_intx:1; |
1462 | unsigned int restore_intx:1; | |
1463 | u32 region_mask; | |
1464 | }; | |
1465 | ||
1466 | static void pcim_release(struct device *gendev, void *res) | |
1467 | { | |
f3d2f165 | 1468 | struct pci_dev *dev = to_pci_dev(gendev); |
9ac7849e TH |
1469 | struct pci_devres *this = res; |
1470 | int i; | |
1471 | ||
1472 | if (dev->msi_enabled) | |
1473 | pci_disable_msi(dev); | |
1474 | if (dev->msix_enabled) | |
1475 | pci_disable_msix(dev); | |
1476 | ||
1477 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) | |
1478 | if (this->region_mask & (1 << i)) | |
1479 | pci_release_region(dev, i); | |
1480 | ||
1481 | if (this->restore_intx) | |
1482 | pci_intx(dev, this->orig_intx); | |
1483 | ||
7f375f32 | 1484 | if (this->enabled && !this->pinned) |
9ac7849e TH |
1485 | pci_disable_device(dev); |
1486 | } | |
1487 | ||
07656d83 | 1488 | static struct pci_devres *get_pci_dr(struct pci_dev *pdev) |
9ac7849e TH |
1489 | { |
1490 | struct pci_devres *dr, *new_dr; | |
1491 | ||
1492 | dr = devres_find(&pdev->dev, pcim_release, NULL, NULL); | |
1493 | if (dr) | |
1494 | return dr; | |
1495 | ||
1496 | new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL); | |
1497 | if (!new_dr) | |
1498 | return NULL; | |
1499 | return devres_get(&pdev->dev, new_dr, NULL, NULL); | |
1500 | } | |
1501 | ||
07656d83 | 1502 | static struct pci_devres *find_pci_dr(struct pci_dev *pdev) |
9ac7849e TH |
1503 | { |
1504 | if (pci_is_managed(pdev)) | |
1505 | return devres_find(&pdev->dev, pcim_release, NULL, NULL); | |
1506 | return NULL; | |
1507 | } | |
1508 | ||
1509 | /** | |
1510 | * pcim_enable_device - Managed pci_enable_device() | |
1511 | * @pdev: PCI device to be initialized | |
1512 | * | |
1513 | * Managed pci_enable_device(). | |
1514 | */ | |
1515 | int pcim_enable_device(struct pci_dev *pdev) | |
1516 | { | |
1517 | struct pci_devres *dr; | |
1518 | int rc; | |
1519 | ||
1520 | dr = get_pci_dr(pdev); | |
1521 | if (unlikely(!dr)) | |
1522 | return -ENOMEM; | |
b95d58ea TH |
1523 | if (dr->enabled) |
1524 | return 0; | |
9ac7849e TH |
1525 | |
1526 | rc = pci_enable_device(pdev); | |
1527 | if (!rc) { | |
1528 | pdev->is_managed = 1; | |
7f375f32 | 1529 | dr->enabled = 1; |
9ac7849e TH |
1530 | } |
1531 | return rc; | |
1532 | } | |
b7fe9434 | 1533 | EXPORT_SYMBOL(pcim_enable_device); |
9ac7849e TH |
1534 | |
1535 | /** | |
1536 | * pcim_pin_device - Pin managed PCI device | |
1537 | * @pdev: PCI device to pin | |
1538 | * | |
1539 | * Pin managed PCI device @pdev. Pinned device won't be disabled on | |
1540 | * driver detach. @pdev must have been enabled with | |
1541 | * pcim_enable_device(). | |
1542 | */ | |
1543 | void pcim_pin_device(struct pci_dev *pdev) | |
1544 | { | |
1545 | struct pci_devres *dr; | |
1546 | ||
1547 | dr = find_pci_dr(pdev); | |
7f375f32 | 1548 | WARN_ON(!dr || !dr->enabled); |
9ac7849e | 1549 | if (dr) |
7f375f32 | 1550 | dr->pinned = 1; |
9ac7849e | 1551 | } |
b7fe9434 | 1552 | EXPORT_SYMBOL(pcim_pin_device); |
9ac7849e | 1553 | |
eca0d467 MG |
1554 | /* |
1555 | * pcibios_add_device - provide arch specific hooks when adding device dev | |
1556 | * @dev: the PCI device being added | |
1557 | * | |
1558 | * Permits the platform to provide architecture specific functionality when | |
1559 | * devices are added. This is the default implementation. Architecture | |
1560 | * implementations can override this. | |
1561 | */ | |
3c78bc61 | 1562 | int __weak pcibios_add_device(struct pci_dev *dev) |
eca0d467 MG |
1563 | { |
1564 | return 0; | |
1565 | } | |
1566 | ||
6ae32c53 SO |
1567 | /** |
1568 | * pcibios_release_device - provide arch specific hooks when releasing device dev | |
1569 | * @dev: the PCI device being released | |
1570 | * | |
1571 | * Permits the platform to provide architecture specific functionality when | |
1572 | * devices are released. This is the default implementation. Architecture | |
1573 | * implementations can override this. | |
1574 | */ | |
1575 | void __weak pcibios_release_device(struct pci_dev *dev) {} | |
1576 | ||
1da177e4 LT |
1577 | /** |
1578 | * pcibios_disable_device - disable arch specific PCI resources for device dev | |
1579 | * @dev: the PCI device to disable | |
1580 | * | |
1581 | * Disables architecture specific PCI resources for the device. This | |
1582 | * is the default implementation. Architecture implementations can | |
1583 | * override this. | |
1584 | */ | |
ff3ce480 | 1585 | void __weak pcibios_disable_device(struct pci_dev *dev) {} |
1da177e4 | 1586 | |
a43ae58c HG |
1587 | /** |
1588 | * pcibios_penalize_isa_irq - penalize an ISA IRQ | |
1589 | * @irq: ISA IRQ to penalize | |
1590 | * @active: IRQ active or not | |
1591 | * | |
1592 | * Permits the platform to provide architecture-specific functionality when | |
1593 | * penalizing ISA IRQs. This is the default implementation. Architecture | |
1594 | * implementations can override this. | |
1595 | */ | |
1596 | void __weak pcibios_penalize_isa_irq(int irq, int active) {} | |
1597 | ||
fa58d305 RW |
1598 | static void do_pci_disable_device(struct pci_dev *dev) |
1599 | { | |
1600 | u16 pci_command; | |
1601 | ||
1602 | pci_read_config_word(dev, PCI_COMMAND, &pci_command); | |
1603 | if (pci_command & PCI_COMMAND_MASTER) { | |
1604 | pci_command &= ~PCI_COMMAND_MASTER; | |
1605 | pci_write_config_word(dev, PCI_COMMAND, pci_command); | |
1606 | } | |
1607 | ||
1608 | pcibios_disable_device(dev); | |
1609 | } | |
1610 | ||
1611 | /** | |
1612 | * pci_disable_enabled_device - Disable device without updating enable_cnt | |
1613 | * @dev: PCI device to disable | |
1614 | * | |
1615 | * NOTE: This function is a backend of PCI power management routines and is | |
1616 | * not supposed to be called drivers. | |
1617 | */ | |
1618 | void pci_disable_enabled_device(struct pci_dev *dev) | |
1619 | { | |
296ccb08 | 1620 | if (pci_is_enabled(dev)) |
fa58d305 RW |
1621 | do_pci_disable_device(dev); |
1622 | } | |
1623 | ||
1da177e4 LT |
1624 | /** |
1625 | * pci_disable_device - Disable PCI device after use | |
1626 | * @dev: PCI device to be disabled | |
1627 | * | |
1628 | * Signal to the system that the PCI device is not in use by the system | |
1629 | * anymore. This only involves disabling PCI bus-mastering, if active. | |
bae94d02 IPG |
1630 | * |
1631 | * Note we don't actually disable the device until all callers of | |
ee6583f6 | 1632 | * pci_enable_device() have called pci_disable_device(). |
1da177e4 | 1633 | */ |
3c78bc61 | 1634 | void pci_disable_device(struct pci_dev *dev) |
1da177e4 | 1635 | { |
9ac7849e | 1636 | struct pci_devres *dr; |
99dc804d | 1637 | |
9ac7849e TH |
1638 | dr = find_pci_dr(dev); |
1639 | if (dr) | |
7f375f32 | 1640 | dr->enabled = 0; |
9ac7849e | 1641 | |
fd6dceab KK |
1642 | dev_WARN_ONCE(&dev->dev, atomic_read(&dev->enable_cnt) <= 0, |
1643 | "disabling already-disabled device"); | |
1644 | ||
cc7ba39b | 1645 | if (atomic_dec_return(&dev->enable_cnt) != 0) |
bae94d02 IPG |
1646 | return; |
1647 | ||
fa58d305 | 1648 | do_pci_disable_device(dev); |
1da177e4 | 1649 | |
fa58d305 | 1650 | dev->is_busmaster = 0; |
1da177e4 | 1651 | } |
b7fe9434 | 1652 | EXPORT_SYMBOL(pci_disable_device); |
1da177e4 | 1653 | |
f7bdd12d BK |
1654 | /** |
1655 | * pcibios_set_pcie_reset_state - set reset state for device dev | |
45e829ea | 1656 | * @dev: the PCIe device reset |
f7bdd12d BK |
1657 | * @state: Reset state to enter into |
1658 | * | |
1659 | * | |
45e829ea | 1660 | * Sets the PCIe reset state for the device. This is the default |
f7bdd12d BK |
1661 | * implementation. Architecture implementations can override this. |
1662 | */ | |
d6d88c83 BH |
1663 | int __weak pcibios_set_pcie_reset_state(struct pci_dev *dev, |
1664 | enum pcie_reset_state state) | |
f7bdd12d BK |
1665 | { |
1666 | return -EINVAL; | |
1667 | } | |
1668 | ||
1669 | /** | |
1670 | * pci_set_pcie_reset_state - set reset state for device dev | |
45e829ea | 1671 | * @dev: the PCIe device reset |
f7bdd12d BK |
1672 | * @state: Reset state to enter into |
1673 | * | |
1674 | * | |
1675 | * Sets the PCI reset state for the device. | |
1676 | */ | |
1677 | int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state) | |
1678 | { | |
1679 | return pcibios_set_pcie_reset_state(dev, state); | |
1680 | } | |
b7fe9434 | 1681 | EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state); |
f7bdd12d | 1682 | |
58ff4633 RW |
1683 | /** |
1684 | * pci_check_pme_status - Check if given device has generated PME. | |
1685 | * @dev: Device to check. | |
1686 | * | |
1687 | * Check the PME status of the device and if set, clear it and clear PME enable | |
1688 | * (if set). Return 'true' if PME status and PME enable were both set or | |
1689 | * 'false' otherwise. | |
1690 | */ | |
1691 | bool pci_check_pme_status(struct pci_dev *dev) | |
1692 | { | |
1693 | int pmcsr_pos; | |
1694 | u16 pmcsr; | |
1695 | bool ret = false; | |
1696 | ||
1697 | if (!dev->pm_cap) | |
1698 | return false; | |
1699 | ||
1700 | pmcsr_pos = dev->pm_cap + PCI_PM_CTRL; | |
1701 | pci_read_config_word(dev, pmcsr_pos, &pmcsr); | |
1702 | if (!(pmcsr & PCI_PM_CTRL_PME_STATUS)) | |
1703 | return false; | |
1704 | ||
1705 | /* Clear PME status. */ | |
1706 | pmcsr |= PCI_PM_CTRL_PME_STATUS; | |
1707 | if (pmcsr & PCI_PM_CTRL_PME_ENABLE) { | |
1708 | /* Disable PME to avoid interrupt flood. */ | |
1709 | pmcsr &= ~PCI_PM_CTRL_PME_ENABLE; | |
1710 | ret = true; | |
1711 | } | |
1712 | ||
1713 | pci_write_config_word(dev, pmcsr_pos, pmcsr); | |
1714 | ||
1715 | return ret; | |
1716 | } | |
1717 | ||
b67ea761 RW |
1718 | /** |
1719 | * pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set. | |
1720 | * @dev: Device to handle. | |
379021d5 | 1721 | * @pme_poll_reset: Whether or not to reset the device's pme_poll flag. |
b67ea761 RW |
1722 | * |
1723 | * Check if @dev has generated PME and queue a resume request for it in that | |
1724 | * case. | |
1725 | */ | |
379021d5 | 1726 | static int pci_pme_wakeup(struct pci_dev *dev, void *pme_poll_reset) |
b67ea761 | 1727 | { |
379021d5 RW |
1728 | if (pme_poll_reset && dev->pme_poll) |
1729 | dev->pme_poll = false; | |
1730 | ||
c125e96f | 1731 | if (pci_check_pme_status(dev)) { |
c125e96f | 1732 | pci_wakeup_event(dev); |
0f953bf6 | 1733 | pm_request_resume(&dev->dev); |
c125e96f | 1734 | } |
b67ea761 RW |
1735 | return 0; |
1736 | } | |
1737 | ||
1738 | /** | |
1739 | * pci_pme_wakeup_bus - Walk given bus and wake up devices on it, if necessary. | |
1740 | * @bus: Top bus of the subtree to walk. | |
1741 | */ | |
1742 | void pci_pme_wakeup_bus(struct pci_bus *bus) | |
1743 | { | |
1744 | if (bus) | |
379021d5 | 1745 | pci_walk_bus(bus, pci_pme_wakeup, (void *)true); |
b67ea761 RW |
1746 | } |
1747 | ||
448bd857 | 1748 | |
eb9d0fe4 RW |
1749 | /** |
1750 | * pci_pme_capable - check the capability of PCI device to generate PME# | |
1751 | * @dev: PCI device to handle. | |
eb9d0fe4 RW |
1752 | * @state: PCI state from which device will issue PME#. |
1753 | */ | |
e5899e1b | 1754 | bool pci_pme_capable(struct pci_dev *dev, pci_power_t state) |
eb9d0fe4 | 1755 | { |
337001b6 | 1756 | if (!dev->pm_cap) |
eb9d0fe4 RW |
1757 | return false; |
1758 | ||
337001b6 | 1759 | return !!(dev->pme_support & (1 << state)); |
eb9d0fe4 | 1760 | } |
b7fe9434 | 1761 | EXPORT_SYMBOL(pci_pme_capable); |
eb9d0fe4 | 1762 | |
df17e62e MG |
1763 | static void pci_pme_list_scan(struct work_struct *work) |
1764 | { | |
379021d5 | 1765 | struct pci_pme_device *pme_dev, *n; |
df17e62e MG |
1766 | |
1767 | mutex_lock(&pci_pme_list_mutex); | |
ce300008 BH |
1768 | list_for_each_entry_safe(pme_dev, n, &pci_pme_list, list) { |
1769 | if (pme_dev->dev->pme_poll) { | |
1770 | struct pci_dev *bridge; | |
1771 | ||
1772 | bridge = pme_dev->dev->bus->self; | |
1773 | /* | |
1774 | * If bridge is in low power state, the | |
1775 | * configuration space of subordinate devices | |
1776 | * may be not accessible | |
1777 | */ | |
1778 | if (bridge && bridge->current_state != PCI_D0) | |
1779 | continue; | |
1780 | pci_pme_wakeup(pme_dev->dev, NULL); | |
1781 | } else { | |
1782 | list_del(&pme_dev->list); | |
1783 | kfree(pme_dev); | |
379021d5 | 1784 | } |
df17e62e | 1785 | } |
ce300008 | 1786 | if (!list_empty(&pci_pme_list)) |
ea00353f LW |
1787 | queue_delayed_work(system_freezable_wq, &pci_pme_work, |
1788 | msecs_to_jiffies(PME_TIMEOUT)); | |
df17e62e MG |
1789 | mutex_unlock(&pci_pme_list_mutex); |
1790 | } | |
1791 | ||
2cef548a | 1792 | static void __pci_pme_active(struct pci_dev *dev, bool enable) |
eb9d0fe4 RW |
1793 | { |
1794 | u16 pmcsr; | |
1795 | ||
ffaddbe8 | 1796 | if (!dev->pme_support) |
eb9d0fe4 RW |
1797 | return; |
1798 | ||
337001b6 | 1799 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
eb9d0fe4 RW |
1800 | /* Clear PME_Status by writing 1 to it and enable PME# */ |
1801 | pmcsr |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE; | |
1802 | if (!enable) | |
1803 | pmcsr &= ~PCI_PM_CTRL_PME_ENABLE; | |
1804 | ||
337001b6 | 1805 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); |
2cef548a RW |
1806 | } |
1807 | ||
dc15e71e RW |
1808 | static void pci_pme_restore(struct pci_dev *dev) |
1809 | { | |
1810 | u16 pmcsr; | |
1811 | ||
1812 | if (!dev->pme_support) | |
1813 | return; | |
1814 | ||
1815 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); | |
1816 | if (dev->wakeup_prepared) { | |
1817 | pmcsr |= PCI_PM_CTRL_PME_ENABLE; | |
1818 | } else { | |
1819 | pmcsr &= ~PCI_PM_CTRL_PME_ENABLE; | |
1820 | pmcsr |= PCI_PM_CTRL_PME_STATUS; | |
1821 | } | |
1822 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); | |
1823 | } | |
1824 | ||
2cef548a RW |
1825 | /** |
1826 | * pci_pme_active - enable or disable PCI device's PME# function | |
1827 | * @dev: PCI device to handle. | |
1828 | * @enable: 'true' to enable PME# generation; 'false' to disable it. | |
1829 | * | |
1830 | * The caller must verify that the device is capable of generating PME# before | |
1831 | * calling this function with @enable equal to 'true'. | |
1832 | */ | |
1833 | void pci_pme_active(struct pci_dev *dev, bool enable) | |
1834 | { | |
1835 | __pci_pme_active(dev, enable); | |
eb9d0fe4 | 1836 | |
6e965e0d HY |
1837 | /* |
1838 | * PCI (as opposed to PCIe) PME requires that the device have | |
1839 | * its PME# line hooked up correctly. Not all hardware vendors | |
1840 | * do this, so the PME never gets delivered and the device | |
1841 | * remains asleep. The easiest way around this is to | |
1842 | * periodically walk the list of suspended devices and check | |
1843 | * whether any have their PME flag set. The assumption is that | |
1844 | * we'll wake up often enough anyway that this won't be a huge | |
1845 | * hit, and the power savings from the devices will still be a | |
1846 | * win. | |
1847 | * | |
1848 | * Although PCIe uses in-band PME message instead of PME# line | |
1849 | * to report PME, PME does not work for some PCIe devices in | |
1850 | * reality. For example, there are devices that set their PME | |
1851 | * status bits, but don't really bother to send a PME message; | |
1852 | * there are PCI Express Root Ports that don't bother to | |
1853 | * trigger interrupts when they receive PME messages from the | |
1854 | * devices below. So PME poll is used for PCIe devices too. | |
1855 | */ | |
df17e62e | 1856 | |
379021d5 | 1857 | if (dev->pme_poll) { |
df17e62e MG |
1858 | struct pci_pme_device *pme_dev; |
1859 | if (enable) { | |
1860 | pme_dev = kmalloc(sizeof(struct pci_pme_device), | |
1861 | GFP_KERNEL); | |
0394cb19 BH |
1862 | if (!pme_dev) { |
1863 | dev_warn(&dev->dev, "can't enable PME#\n"); | |
1864 | return; | |
1865 | } | |
df17e62e MG |
1866 | pme_dev->dev = dev; |
1867 | mutex_lock(&pci_pme_list_mutex); | |
1868 | list_add(&pme_dev->list, &pci_pme_list); | |
1869 | if (list_is_singular(&pci_pme_list)) | |
ea00353f LW |
1870 | queue_delayed_work(system_freezable_wq, |
1871 | &pci_pme_work, | |
1872 | msecs_to_jiffies(PME_TIMEOUT)); | |
df17e62e MG |
1873 | mutex_unlock(&pci_pme_list_mutex); |
1874 | } else { | |
1875 | mutex_lock(&pci_pme_list_mutex); | |
1876 | list_for_each_entry(pme_dev, &pci_pme_list, list) { | |
1877 | if (pme_dev->dev == dev) { | |
1878 | list_del(&pme_dev->list); | |
1879 | kfree(pme_dev); | |
1880 | break; | |
1881 | } | |
1882 | } | |
1883 | mutex_unlock(&pci_pme_list_mutex); | |
1884 | } | |
1885 | } | |
1886 | ||
85b8582d | 1887 | dev_dbg(&dev->dev, "PME# %s\n", enable ? "enabled" : "disabled"); |
eb9d0fe4 | 1888 | } |
b7fe9434 | 1889 | EXPORT_SYMBOL(pci_pme_active); |
eb9d0fe4 | 1890 | |
1da177e4 | 1891 | /** |
6cbf8214 | 1892 | * __pci_enable_wake - enable PCI device as wakeup event source |
075c1771 DB |
1893 | * @dev: PCI device affected |
1894 | * @state: PCI state from which device will issue wakeup events | |
6cbf8214 | 1895 | * @runtime: True if the events are to be generated at run time |
075c1771 DB |
1896 | * @enable: True to enable event generation; false to disable |
1897 | * | |
1898 | * This enables the device as a wakeup event source, or disables it. | |
1899 | * When such events involves platform-specific hooks, those hooks are | |
1900 | * called automatically by this routine. | |
1901 | * | |
1902 | * Devices with legacy power management (no standard PCI PM capabilities) | |
eb9d0fe4 | 1903 | * always require such platform hooks. |
075c1771 | 1904 | * |
eb9d0fe4 RW |
1905 | * RETURN VALUE: |
1906 | * 0 is returned on success | |
1907 | * -EINVAL is returned if device is not supposed to wake up the system | |
1908 | * Error code depending on the platform is returned if both the platform and | |
1909 | * the native mechanism fail to enable the generation of wake-up events | |
1da177e4 | 1910 | */ |
6cbf8214 RW |
1911 | int __pci_enable_wake(struct pci_dev *dev, pci_power_t state, |
1912 | bool runtime, bool enable) | |
1da177e4 | 1913 | { |
5bcc2fb4 | 1914 | int ret = 0; |
075c1771 | 1915 | |
6cbf8214 | 1916 | if (enable && !runtime && !device_may_wakeup(&dev->dev)) |
eb9d0fe4 | 1917 | return -EINVAL; |
1da177e4 | 1918 | |
dc15e71e RW |
1919 | /* |
1920 | * Don't do the same thing twice in a row for one device, but restore | |
1921 | * PME Enable in case it has been updated by config space restoration. | |
1922 | */ | |
1923 | if (!!enable == !!dev->wakeup_prepared) { | |
1924 | pci_pme_restore(dev); | |
e80bb09d | 1925 | return 0; |
dc15e71e | 1926 | } |
e80bb09d | 1927 | |
eb9d0fe4 RW |
1928 | /* |
1929 | * According to "PCI System Architecture" 4th ed. by Tom Shanley & Don | |
1930 | * Anderson we should be doing PME# wake enable followed by ACPI wake | |
1931 | * enable. To disable wake-up we call the platform first, for symmetry. | |
075c1771 | 1932 | */ |
1da177e4 | 1933 | |
5bcc2fb4 RW |
1934 | if (enable) { |
1935 | int error; | |
1da177e4 | 1936 | |
5bcc2fb4 RW |
1937 | if (pci_pme_capable(dev, state)) |
1938 | pci_pme_active(dev, true); | |
1939 | else | |
1940 | ret = 1; | |
6cbf8214 RW |
1941 | error = runtime ? platform_pci_run_wake(dev, true) : |
1942 | platform_pci_sleep_wake(dev, true); | |
5bcc2fb4 RW |
1943 | if (ret) |
1944 | ret = error; | |
e80bb09d RW |
1945 | if (!ret) |
1946 | dev->wakeup_prepared = true; | |
5bcc2fb4 | 1947 | } else { |
6cbf8214 RW |
1948 | if (runtime) |
1949 | platform_pci_run_wake(dev, false); | |
1950 | else | |
1951 | platform_pci_sleep_wake(dev, false); | |
5bcc2fb4 | 1952 | pci_pme_active(dev, false); |
e80bb09d | 1953 | dev->wakeup_prepared = false; |
5bcc2fb4 | 1954 | } |
1da177e4 | 1955 | |
5bcc2fb4 | 1956 | return ret; |
eb9d0fe4 | 1957 | } |
6cbf8214 | 1958 | EXPORT_SYMBOL(__pci_enable_wake); |
1da177e4 | 1959 | |
0235c4fc RW |
1960 | /** |
1961 | * pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold | |
1962 | * @dev: PCI device to prepare | |
1963 | * @enable: True to enable wake-up event generation; false to disable | |
1964 | * | |
1965 | * Many drivers want the device to wake up the system from D3_hot or D3_cold | |
1966 | * and this function allows them to set that up cleanly - pci_enable_wake() | |
1967 | * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI | |
1968 | * ordering constraints. | |
1969 | * | |
1970 | * This function only returns error code if the device is not capable of | |
1971 | * generating PME# from both D3_hot and D3_cold, and the platform is unable to | |
1972 | * enable wake-up power for it. | |
1973 | */ | |
1974 | int pci_wake_from_d3(struct pci_dev *dev, bool enable) | |
1975 | { | |
1976 | return pci_pme_capable(dev, PCI_D3cold) ? | |
1977 | pci_enable_wake(dev, PCI_D3cold, enable) : | |
1978 | pci_enable_wake(dev, PCI_D3hot, enable); | |
1979 | } | |
b7fe9434 | 1980 | EXPORT_SYMBOL(pci_wake_from_d3); |
0235c4fc | 1981 | |
404cc2d8 | 1982 | /** |
37139074 JB |
1983 | * pci_target_state - find an appropriate low power state for a given PCI dev |
1984 | * @dev: PCI device | |
1985 | * | |
1986 | * Use underlying platform code to find a supported low power state for @dev. | |
1987 | * If the platform can't manage @dev, return the deepest state from which it | |
1988 | * can generate wake events, based on any available PME info. | |
404cc2d8 | 1989 | */ |
0b950f0f | 1990 | static pci_power_t pci_target_state(struct pci_dev *dev) |
404cc2d8 RW |
1991 | { |
1992 | pci_power_t target_state = PCI_D3hot; | |
404cc2d8 RW |
1993 | |
1994 | if (platform_pci_power_manageable(dev)) { | |
1995 | /* | |
1996 | * Call the platform to choose the target state of the device | |
1997 | * and enable wake-up from this state if supported. | |
1998 | */ | |
1999 | pci_power_t state = platform_pci_choose_state(dev); | |
2000 | ||
2001 | switch (state) { | |
2002 | case PCI_POWER_ERROR: | |
2003 | case PCI_UNKNOWN: | |
2004 | break; | |
2005 | case PCI_D1: | |
2006 | case PCI_D2: | |
2007 | if (pci_no_d1d2(dev)) | |
2008 | break; | |
2009 | default: | |
2010 | target_state = state; | |
404cc2d8 | 2011 | } |
4132a577 LW |
2012 | |
2013 | return target_state; | |
2014 | } | |
2015 | ||
2016 | if (!dev->pm_cap) | |
d2abdf62 | 2017 | target_state = PCI_D0; |
4132a577 LW |
2018 | |
2019 | /* | |
2020 | * If the device is in D3cold even though it's not power-manageable by | |
2021 | * the platform, it may have been powered down by non-standard means. | |
2022 | * Best to let it slumber. | |
2023 | */ | |
2024 | if (dev->current_state == PCI_D3cold) | |
2025 | target_state = PCI_D3cold; | |
2026 | ||
2027 | if (device_may_wakeup(&dev->dev)) { | |
404cc2d8 RW |
2028 | /* |
2029 | * Find the deepest state from which the device can generate | |
2030 | * wake-up events, make it the target state and enable device | |
2031 | * to generate PME#. | |
2032 | */ | |
337001b6 RW |
2033 | if (dev->pme_support) { |
2034 | while (target_state | |
2035 | && !(dev->pme_support & (1 << target_state))) | |
2036 | target_state--; | |
404cc2d8 RW |
2037 | } |
2038 | } | |
2039 | ||
e5899e1b RW |
2040 | return target_state; |
2041 | } | |
2042 | ||
2043 | /** | |
2044 | * pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state | |
2045 | * @dev: Device to handle. | |
2046 | * | |
2047 | * Choose the power state appropriate for the device depending on whether | |
2048 | * it can wake up the system and/or is power manageable by the platform | |
2049 | * (PCI_D3hot is the default) and put the device into that state. | |
2050 | */ | |
2051 | int pci_prepare_to_sleep(struct pci_dev *dev) | |
2052 | { | |
2053 | pci_power_t target_state = pci_target_state(dev); | |
2054 | int error; | |
2055 | ||
2056 | if (target_state == PCI_POWER_ERROR) | |
2057 | return -EIO; | |
2058 | ||
8efb8c76 | 2059 | pci_enable_wake(dev, target_state, device_may_wakeup(&dev->dev)); |
c157dfa3 | 2060 | |
404cc2d8 RW |
2061 | error = pci_set_power_state(dev, target_state); |
2062 | ||
2063 | if (error) | |
2064 | pci_enable_wake(dev, target_state, false); | |
2065 | ||
2066 | return error; | |
2067 | } | |
b7fe9434 | 2068 | EXPORT_SYMBOL(pci_prepare_to_sleep); |
404cc2d8 RW |
2069 | |
2070 | /** | |
443bd1c4 | 2071 | * pci_back_from_sleep - turn PCI device on during system-wide transition into working state |
404cc2d8 RW |
2072 | * @dev: Device to handle. |
2073 | * | |
88393161 | 2074 | * Disable device's system wake-up capability and put it into D0. |
404cc2d8 RW |
2075 | */ |
2076 | int pci_back_from_sleep(struct pci_dev *dev) | |
2077 | { | |
2078 | pci_enable_wake(dev, PCI_D0, false); | |
2079 | return pci_set_power_state(dev, PCI_D0); | |
2080 | } | |
b7fe9434 | 2081 | EXPORT_SYMBOL(pci_back_from_sleep); |
404cc2d8 | 2082 | |
6cbf8214 RW |
2083 | /** |
2084 | * pci_finish_runtime_suspend - Carry out PCI-specific part of runtime suspend. | |
2085 | * @dev: PCI device being suspended. | |
2086 | * | |
2087 | * Prepare @dev to generate wake-up events at run time and put it into a low | |
2088 | * power state. | |
2089 | */ | |
2090 | int pci_finish_runtime_suspend(struct pci_dev *dev) | |
2091 | { | |
2092 | pci_power_t target_state = pci_target_state(dev); | |
2093 | int error; | |
2094 | ||
2095 | if (target_state == PCI_POWER_ERROR) | |
2096 | return -EIO; | |
2097 | ||
448bd857 HY |
2098 | dev->runtime_d3cold = target_state == PCI_D3cold; |
2099 | ||
6cbf8214 RW |
2100 | __pci_enable_wake(dev, target_state, true, pci_dev_run_wake(dev)); |
2101 | ||
2102 | error = pci_set_power_state(dev, target_state); | |
2103 | ||
448bd857 | 2104 | if (error) { |
6cbf8214 | 2105 | __pci_enable_wake(dev, target_state, true, false); |
448bd857 HY |
2106 | dev->runtime_d3cold = false; |
2107 | } | |
6cbf8214 RW |
2108 | |
2109 | return error; | |
2110 | } | |
2111 | ||
b67ea761 RW |
2112 | /** |
2113 | * pci_dev_run_wake - Check if device can generate run-time wake-up events. | |
2114 | * @dev: Device to check. | |
2115 | * | |
f7625980 | 2116 | * Return true if the device itself is capable of generating wake-up events |
b67ea761 RW |
2117 | * (through the platform or using the native PCIe PME) or if the device supports |
2118 | * PME and one of its upstream bridges can generate wake-up events. | |
2119 | */ | |
2120 | bool pci_dev_run_wake(struct pci_dev *dev) | |
2121 | { | |
2122 | struct pci_bus *bus = dev->bus; | |
2123 | ||
2124 | if (device_run_wake(&dev->dev)) | |
2125 | return true; | |
2126 | ||
2127 | if (!dev->pme_support) | |
2128 | return false; | |
2129 | ||
6496ebd7 AS |
2130 | /* PME-capable in principle, but not from the intended sleep state */ |
2131 | if (!pci_pme_capable(dev, pci_target_state(dev))) | |
2132 | return false; | |
2133 | ||
b67ea761 RW |
2134 | while (bus->parent) { |
2135 | struct pci_dev *bridge = bus->self; | |
2136 | ||
2137 | if (device_run_wake(&bridge->dev)) | |
2138 | return true; | |
2139 | ||
2140 | bus = bus->parent; | |
2141 | } | |
2142 | ||
2143 | /* We have reached the root bus. */ | |
2144 | if (bus->bridge) | |
2145 | return device_run_wake(bus->bridge); | |
2146 | ||
2147 | return false; | |
2148 | } | |
2149 | EXPORT_SYMBOL_GPL(pci_dev_run_wake); | |
2150 | ||
bac2a909 RW |
2151 | /** |
2152 | * pci_dev_keep_suspended - Check if the device can stay in the suspended state. | |
2153 | * @pci_dev: Device to check. | |
2154 | * | |
2155 | * Return 'true' if the device is runtime-suspended, it doesn't have to be | |
2156 | * reconfigured due to wakeup settings difference between system and runtime | |
2157 | * suspend and the current power state of it is suitable for the upcoming | |
2158 | * (system) transition. | |
2cef548a RW |
2159 | * |
2160 | * If the device is not configured for system wakeup, disable PME for it before | |
2161 | * returning 'true' to prevent it from waking up the system unnecessarily. | |
bac2a909 RW |
2162 | */ |
2163 | bool pci_dev_keep_suspended(struct pci_dev *pci_dev) | |
2164 | { | |
2165 | struct device *dev = &pci_dev->dev; | |
2166 | ||
2167 | if (!pm_runtime_suspended(dev) | |
2cef548a | 2168 | || pci_target_state(pci_dev) != pci_dev->current_state |
4d071c32 ID |
2169 | || platform_pci_need_resume(pci_dev) |
2170 | || (pci_dev->dev_flags & PCI_DEV_FLAGS_NEEDS_RESUME)) | |
bac2a909 RW |
2171 | return false; |
2172 | ||
2cef548a RW |
2173 | /* |
2174 | * At this point the device is good to go unless it's been configured | |
2175 | * to generate PME at the runtime suspend time, but it is not supposed | |
2176 | * to wake up the system. In that case, simply disable PME for it | |
2177 | * (it will have to be re-enabled on exit from system resume). | |
2178 | * | |
2179 | * If the device's power state is D3cold and the platform check above | |
2180 | * hasn't triggered, the device's configuration is suitable and we don't | |
2181 | * need to manipulate it at all. | |
2182 | */ | |
2183 | spin_lock_irq(&dev->power.lock); | |
2184 | ||
2185 | if (pm_runtime_suspended(dev) && pci_dev->current_state < PCI_D3cold && | |
2186 | !device_may_wakeup(dev)) | |
2187 | __pci_pme_active(pci_dev, false); | |
2188 | ||
2189 | spin_unlock_irq(&dev->power.lock); | |
2190 | return true; | |
2191 | } | |
2192 | ||
2193 | /** | |
2194 | * pci_dev_complete_resume - Finalize resume from system sleep for a device. | |
2195 | * @pci_dev: Device to handle. | |
2196 | * | |
2197 | * If the device is runtime suspended and wakeup-capable, enable PME for it as | |
2198 | * it might have been disabled during the prepare phase of system suspend if | |
2199 | * the device was not configured for system wakeup. | |
2200 | */ | |
2201 | void pci_dev_complete_resume(struct pci_dev *pci_dev) | |
2202 | { | |
2203 | struct device *dev = &pci_dev->dev; | |
2204 | ||
2205 | if (!pci_dev_run_wake(pci_dev)) | |
2206 | return; | |
2207 | ||
2208 | spin_lock_irq(&dev->power.lock); | |
2209 | ||
2210 | if (pm_runtime_suspended(dev) && pci_dev->current_state < PCI_D3cold) | |
2211 | __pci_pme_active(pci_dev, true); | |
2212 | ||
2213 | spin_unlock_irq(&dev->power.lock); | |
bac2a909 RW |
2214 | } |
2215 | ||
b3c32c4f HY |
2216 | void pci_config_pm_runtime_get(struct pci_dev *pdev) |
2217 | { | |
2218 | struct device *dev = &pdev->dev; | |
2219 | struct device *parent = dev->parent; | |
2220 | ||
2221 | if (parent) | |
2222 | pm_runtime_get_sync(parent); | |
2223 | pm_runtime_get_noresume(dev); | |
2224 | /* | |
2225 | * pdev->current_state is set to PCI_D3cold during suspending, | |
2226 | * so wait until suspending completes | |
2227 | */ | |
2228 | pm_runtime_barrier(dev); | |
2229 | /* | |
2230 | * Only need to resume devices in D3cold, because config | |
2231 | * registers are still accessible for devices suspended but | |
2232 | * not in D3cold. | |
2233 | */ | |
2234 | if (pdev->current_state == PCI_D3cold) | |
2235 | pm_runtime_resume(dev); | |
2236 | } | |
2237 | ||
2238 | void pci_config_pm_runtime_put(struct pci_dev *pdev) | |
2239 | { | |
2240 | struct device *dev = &pdev->dev; | |
2241 | struct device *parent = dev->parent; | |
2242 | ||
2243 | pm_runtime_put(dev); | |
2244 | if (parent) | |
2245 | pm_runtime_put_sync(parent); | |
2246 | } | |
2247 | ||
9d26d3a8 MW |
2248 | /** |
2249 | * pci_bridge_d3_possible - Is it possible to put the bridge into D3 | |
2250 | * @bridge: Bridge to check | |
2251 | * | |
2252 | * This function checks if it is possible to move the bridge to D3. | |
2253 | * Currently we only allow D3 for recent enough PCIe ports. | |
2254 | */ | |
c6a63307 | 2255 | bool pci_bridge_d3_possible(struct pci_dev *bridge) |
9d26d3a8 MW |
2256 | { |
2257 | unsigned int year; | |
2258 | ||
2259 | if (!pci_is_pcie(bridge)) | |
2260 | return false; | |
2261 | ||
2262 | switch (pci_pcie_type(bridge)) { | |
2263 | case PCI_EXP_TYPE_ROOT_PORT: | |
2264 | case PCI_EXP_TYPE_UPSTREAM: | |
2265 | case PCI_EXP_TYPE_DOWNSTREAM: | |
2266 | if (pci_bridge_d3_disable) | |
2267 | return false; | |
97a90aee LW |
2268 | |
2269 | /* | |
d98e0929 BH |
2270 | * Hotplug interrupts cannot be delivered if the link is down, |
2271 | * so parents of a hotplug port must stay awake. In addition, | |
2272 | * hotplug ports handled by firmware in System Management Mode | |
97a90aee | 2273 | * may not be put into D3 by the OS (Thunderbolt on non-Macs). |
d98e0929 | 2274 | * For simplicity, disallow in general for now. |
97a90aee | 2275 | */ |
d98e0929 | 2276 | if (bridge->is_hotplug_bridge) |
97a90aee LW |
2277 | return false; |
2278 | ||
9d26d3a8 MW |
2279 | if (pci_bridge_d3_force) |
2280 | return true; | |
2281 | ||
2282 | /* | |
2283 | * It should be safe to put PCIe ports from 2015 or newer | |
2284 | * to D3. | |
2285 | */ | |
2286 | if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && | |
2287 | year >= 2015) { | |
2288 | return true; | |
2289 | } | |
2290 | break; | |
2291 | } | |
2292 | ||
2293 | return false; | |
2294 | } | |
2295 | ||
2296 | static int pci_dev_check_d3cold(struct pci_dev *dev, void *data) | |
2297 | { | |
2298 | bool *d3cold_ok = data; | |
9d26d3a8 | 2299 | |
718a0609 LW |
2300 | if (/* The device needs to be allowed to go D3cold ... */ |
2301 | dev->no_d3cold || !dev->d3cold_allowed || | |
2302 | ||
2303 | /* ... and if it is wakeup capable to do so from D3cold. */ | |
2304 | (device_may_wakeup(&dev->dev) && | |
2305 | !pci_pme_capable(dev, PCI_D3cold)) || | |
2306 | ||
2307 | /* If it is a bridge it must be allowed to go to D3. */ | |
d98e0929 | 2308 | !pci_power_manageable(dev)) |
9d26d3a8 | 2309 | |
718a0609 | 2310 | *d3cold_ok = false; |
9d26d3a8 | 2311 | |
718a0609 | 2312 | return !*d3cold_ok; |
9d26d3a8 MW |
2313 | } |
2314 | ||
2315 | /* | |
2316 | * pci_bridge_d3_update - Update bridge D3 capabilities | |
2317 | * @dev: PCI device which is changed | |
9d26d3a8 MW |
2318 | * |
2319 | * Update upstream bridge PM capabilities accordingly depending on if the | |
2320 | * device PM configuration was changed or the device is being removed. The | |
2321 | * change is also propagated upstream. | |
2322 | */ | |
1ed276a7 | 2323 | void pci_bridge_d3_update(struct pci_dev *dev) |
9d26d3a8 | 2324 | { |
1ed276a7 | 2325 | bool remove = !device_is_registered(&dev->dev); |
9d26d3a8 MW |
2326 | struct pci_dev *bridge; |
2327 | bool d3cold_ok = true; | |
2328 | ||
2329 | bridge = pci_upstream_bridge(dev); | |
2330 | if (!bridge || !pci_bridge_d3_possible(bridge)) | |
2331 | return; | |
2332 | ||
9d26d3a8 | 2333 | /* |
e8559b71 LW |
2334 | * If D3 is currently allowed for the bridge, removing one of its |
2335 | * children won't change that. | |
2336 | */ | |
2337 | if (remove && bridge->bridge_d3) | |
2338 | return; | |
2339 | ||
2340 | /* | |
2341 | * If D3 is currently allowed for the bridge and a child is added or | |
2342 | * changed, disallowance of D3 can only be caused by that child, so | |
2343 | * we only need to check that single device, not any of its siblings. | |
2344 | * | |
2345 | * If D3 is currently not allowed for the bridge, checking the device | |
2346 | * first may allow us to skip checking its siblings. | |
9d26d3a8 MW |
2347 | */ |
2348 | if (!remove) | |
2349 | pci_dev_check_d3cold(dev, &d3cold_ok); | |
2350 | ||
e8559b71 LW |
2351 | /* |
2352 | * If D3 is currently not allowed for the bridge, this may be caused | |
2353 | * either by the device being changed/removed or any of its siblings, | |
2354 | * so we need to go through all children to find out if one of them | |
2355 | * continues to block D3. | |
2356 | */ | |
2357 | if (d3cold_ok && !bridge->bridge_d3) | |
9d26d3a8 MW |
2358 | pci_walk_bus(bridge->subordinate, pci_dev_check_d3cold, |
2359 | &d3cold_ok); | |
9d26d3a8 MW |
2360 | |
2361 | if (bridge->bridge_d3 != d3cold_ok) { | |
2362 | bridge->bridge_d3 = d3cold_ok; | |
2363 | /* Propagate change to upstream bridges */ | |
1ed276a7 | 2364 | pci_bridge_d3_update(bridge); |
9d26d3a8 | 2365 | } |
9d26d3a8 MW |
2366 | } |
2367 | ||
9d26d3a8 MW |
2368 | /** |
2369 | * pci_d3cold_enable - Enable D3cold for device | |
2370 | * @dev: PCI device to handle | |
2371 | * | |
2372 | * This function can be used in drivers to enable D3cold from the device | |
2373 | * they handle. It also updates upstream PCI bridge PM capabilities | |
2374 | * accordingly. | |
2375 | */ | |
2376 | void pci_d3cold_enable(struct pci_dev *dev) | |
2377 | { | |
2378 | if (dev->no_d3cold) { | |
2379 | dev->no_d3cold = false; | |
1ed276a7 | 2380 | pci_bridge_d3_update(dev); |
9d26d3a8 MW |
2381 | } |
2382 | } | |
2383 | EXPORT_SYMBOL_GPL(pci_d3cold_enable); | |
2384 | ||
2385 | /** | |
2386 | * pci_d3cold_disable - Disable D3cold for device | |
2387 | * @dev: PCI device to handle | |
2388 | * | |
2389 | * This function can be used in drivers to disable D3cold from the device | |
2390 | * they handle. It also updates upstream PCI bridge PM capabilities | |
2391 | * accordingly. | |
2392 | */ | |
2393 | void pci_d3cold_disable(struct pci_dev *dev) | |
2394 | { | |
2395 | if (!dev->no_d3cold) { | |
2396 | dev->no_d3cold = true; | |
1ed276a7 | 2397 | pci_bridge_d3_update(dev); |
9d26d3a8 MW |
2398 | } |
2399 | } | |
2400 | EXPORT_SYMBOL_GPL(pci_d3cold_disable); | |
2401 | ||
eb9d0fe4 RW |
2402 | /** |
2403 | * pci_pm_init - Initialize PM functions of given PCI device | |
2404 | * @dev: PCI device to handle. | |
2405 | */ | |
2406 | void pci_pm_init(struct pci_dev *dev) | |
2407 | { | |
2408 | int pm; | |
2409 | u16 pmc; | |
1da177e4 | 2410 | |
bb910a70 | 2411 | pm_runtime_forbid(&dev->dev); |
967577b0 HY |
2412 | pm_runtime_set_active(&dev->dev); |
2413 | pm_runtime_enable(&dev->dev); | |
a1e4d72c | 2414 | device_enable_async_suspend(&dev->dev); |
e80bb09d | 2415 | dev->wakeup_prepared = false; |
bb910a70 | 2416 | |
337001b6 | 2417 | dev->pm_cap = 0; |
ffaddbe8 | 2418 | dev->pme_support = 0; |
337001b6 | 2419 | |
eb9d0fe4 RW |
2420 | /* find PCI PM capability in list */ |
2421 | pm = pci_find_capability(dev, PCI_CAP_ID_PM); | |
2422 | if (!pm) | |
50246dd4 | 2423 | return; |
eb9d0fe4 RW |
2424 | /* Check device's ability to generate PME# */ |
2425 | pci_read_config_word(dev, pm + PCI_PM_PMC, &pmc); | |
075c1771 | 2426 | |
eb9d0fe4 RW |
2427 | if ((pmc & PCI_PM_CAP_VER_MASK) > 3) { |
2428 | dev_err(&dev->dev, "unsupported PM cap regs version (%u)\n", | |
2429 | pmc & PCI_PM_CAP_VER_MASK); | |
50246dd4 | 2430 | return; |
eb9d0fe4 RW |
2431 | } |
2432 | ||
337001b6 | 2433 | dev->pm_cap = pm; |
1ae861e6 | 2434 | dev->d3_delay = PCI_PM_D3_WAIT; |
448bd857 | 2435 | dev->d3cold_delay = PCI_PM_D3COLD_WAIT; |
9d26d3a8 | 2436 | dev->bridge_d3 = pci_bridge_d3_possible(dev); |
4f9c1397 | 2437 | dev->d3cold_allowed = true; |
337001b6 RW |
2438 | |
2439 | dev->d1_support = false; | |
2440 | dev->d2_support = false; | |
2441 | if (!pci_no_d1d2(dev)) { | |
c9ed77ee | 2442 | if (pmc & PCI_PM_CAP_D1) |
337001b6 | 2443 | dev->d1_support = true; |
c9ed77ee | 2444 | if (pmc & PCI_PM_CAP_D2) |
337001b6 | 2445 | dev->d2_support = true; |
c9ed77ee BH |
2446 | |
2447 | if (dev->d1_support || dev->d2_support) | |
2448 | dev_printk(KERN_DEBUG, &dev->dev, "supports%s%s\n", | |
ec84f126 JB |
2449 | dev->d1_support ? " D1" : "", |
2450 | dev->d2_support ? " D2" : ""); | |
337001b6 RW |
2451 | } |
2452 | ||
2453 | pmc &= PCI_PM_CAP_PME_MASK; | |
2454 | if (pmc) { | |
10c3d71d BH |
2455 | dev_printk(KERN_DEBUG, &dev->dev, |
2456 | "PME# supported from%s%s%s%s%s\n", | |
c9ed77ee BH |
2457 | (pmc & PCI_PM_CAP_PME_D0) ? " D0" : "", |
2458 | (pmc & PCI_PM_CAP_PME_D1) ? " D1" : "", | |
2459 | (pmc & PCI_PM_CAP_PME_D2) ? " D2" : "", | |
2460 | (pmc & PCI_PM_CAP_PME_D3) ? " D3hot" : "", | |
2461 | (pmc & PCI_PM_CAP_PME_D3cold) ? " D3cold" : ""); | |
337001b6 | 2462 | dev->pme_support = pmc >> PCI_PM_CAP_PME_SHIFT; |
379021d5 | 2463 | dev->pme_poll = true; |
eb9d0fe4 RW |
2464 | /* |
2465 | * Make device's PM flags reflect the wake-up capability, but | |
2466 | * let the user space enable it to wake up the system as needed. | |
2467 | */ | |
2468 | device_set_wakeup_capable(&dev->dev, true); | |
eb9d0fe4 | 2469 | /* Disable the PME# generation functionality */ |
337001b6 | 2470 | pci_pme_active(dev, false); |
eb9d0fe4 | 2471 | } |
1da177e4 LT |
2472 | } |
2473 | ||
938174e5 SS |
2474 | static unsigned long pci_ea_flags(struct pci_dev *dev, u8 prop) |
2475 | { | |
92efb1bd | 2476 | unsigned long flags = IORESOURCE_PCI_FIXED | IORESOURCE_PCI_EA_BEI; |
938174e5 SS |
2477 | |
2478 | switch (prop) { | |
2479 | case PCI_EA_P_MEM: | |
2480 | case PCI_EA_P_VF_MEM: | |
2481 | flags |= IORESOURCE_MEM; | |
2482 | break; | |
2483 | case PCI_EA_P_MEM_PREFETCH: | |
2484 | case PCI_EA_P_VF_MEM_PREFETCH: | |
2485 | flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
2486 | break; | |
2487 | case PCI_EA_P_IO: | |
2488 | flags |= IORESOURCE_IO; | |
2489 | break; | |
2490 | default: | |
2491 | return 0; | |
2492 | } | |
2493 | ||
2494 | return flags; | |
2495 | } | |
2496 | ||
2497 | static struct resource *pci_ea_get_resource(struct pci_dev *dev, u8 bei, | |
2498 | u8 prop) | |
2499 | { | |
2500 | if (bei <= PCI_EA_BEI_BAR5 && prop <= PCI_EA_P_IO) | |
2501 | return &dev->resource[bei]; | |
11183991 DD |
2502 | #ifdef CONFIG_PCI_IOV |
2503 | else if (bei >= PCI_EA_BEI_VF_BAR0 && bei <= PCI_EA_BEI_VF_BAR5 && | |
2504 | (prop == PCI_EA_P_VF_MEM || prop == PCI_EA_P_VF_MEM_PREFETCH)) | |
2505 | return &dev->resource[PCI_IOV_RESOURCES + | |
2506 | bei - PCI_EA_BEI_VF_BAR0]; | |
2507 | #endif | |
938174e5 SS |
2508 | else if (bei == PCI_EA_BEI_ROM) |
2509 | return &dev->resource[PCI_ROM_RESOURCE]; | |
2510 | else | |
2511 | return NULL; | |
2512 | } | |
2513 | ||
2514 | /* Read an Enhanced Allocation (EA) entry */ | |
2515 | static int pci_ea_read(struct pci_dev *dev, int offset) | |
2516 | { | |
2517 | struct resource *res; | |
2518 | int ent_size, ent_offset = offset; | |
2519 | resource_size_t start, end; | |
2520 | unsigned long flags; | |
26635112 | 2521 | u32 dw0, bei, base, max_offset; |
938174e5 SS |
2522 | u8 prop; |
2523 | bool support_64 = (sizeof(resource_size_t) >= 8); | |
2524 | ||
2525 | pci_read_config_dword(dev, ent_offset, &dw0); | |
2526 | ent_offset += 4; | |
2527 | ||
2528 | /* Entry size field indicates DWORDs after 1st */ | |
2529 | ent_size = ((dw0 & PCI_EA_ES) + 1) << 2; | |
2530 | ||
2531 | if (!(dw0 & PCI_EA_ENABLE)) /* Entry not enabled */ | |
2532 | goto out; | |
2533 | ||
26635112 BH |
2534 | bei = (dw0 & PCI_EA_BEI) >> 4; |
2535 | prop = (dw0 & PCI_EA_PP) >> 8; | |
2536 | ||
938174e5 SS |
2537 | /* |
2538 | * If the Property is in the reserved range, try the Secondary | |
2539 | * Property instead. | |
2540 | */ | |
2541 | if (prop > PCI_EA_P_BRIDGE_IO && prop < PCI_EA_P_MEM_RESERVED) | |
26635112 | 2542 | prop = (dw0 & PCI_EA_SP) >> 16; |
938174e5 SS |
2543 | if (prop > PCI_EA_P_BRIDGE_IO) |
2544 | goto out; | |
2545 | ||
26635112 | 2546 | res = pci_ea_get_resource(dev, bei, prop); |
938174e5 | 2547 | if (!res) { |
26635112 | 2548 | dev_err(&dev->dev, "Unsupported EA entry BEI: %u\n", bei); |
938174e5 SS |
2549 | goto out; |
2550 | } | |
2551 | ||
2552 | flags = pci_ea_flags(dev, prop); | |
2553 | if (!flags) { | |
2554 | dev_err(&dev->dev, "Unsupported EA properties: %#x\n", prop); | |
2555 | goto out; | |
2556 | } | |
2557 | ||
2558 | /* Read Base */ | |
2559 | pci_read_config_dword(dev, ent_offset, &base); | |
2560 | start = (base & PCI_EA_FIELD_MASK); | |
2561 | ent_offset += 4; | |
2562 | ||
2563 | /* Read MaxOffset */ | |
2564 | pci_read_config_dword(dev, ent_offset, &max_offset); | |
2565 | ent_offset += 4; | |
2566 | ||
2567 | /* Read Base MSBs (if 64-bit entry) */ | |
2568 | if (base & PCI_EA_IS_64) { | |
2569 | u32 base_upper; | |
2570 | ||
2571 | pci_read_config_dword(dev, ent_offset, &base_upper); | |
2572 | ent_offset += 4; | |
2573 | ||
2574 | flags |= IORESOURCE_MEM_64; | |
2575 | ||
2576 | /* entry starts above 32-bit boundary, can't use */ | |
2577 | if (!support_64 && base_upper) | |
2578 | goto out; | |
2579 | ||
2580 | if (support_64) | |
2581 | start |= ((u64)base_upper << 32); | |
2582 | } | |
2583 | ||
2584 | end = start + (max_offset | 0x03); | |
2585 | ||
2586 | /* Read MaxOffset MSBs (if 64-bit entry) */ | |
2587 | if (max_offset & PCI_EA_IS_64) { | |
2588 | u32 max_offset_upper; | |
2589 | ||
2590 | pci_read_config_dword(dev, ent_offset, &max_offset_upper); | |
2591 | ent_offset += 4; | |
2592 | ||
2593 | flags |= IORESOURCE_MEM_64; | |
2594 | ||
2595 | /* entry too big, can't use */ | |
2596 | if (!support_64 && max_offset_upper) | |
2597 | goto out; | |
2598 | ||
2599 | if (support_64) | |
2600 | end += ((u64)max_offset_upper << 32); | |
2601 | } | |
2602 | ||
2603 | if (end < start) { | |
2604 | dev_err(&dev->dev, "EA Entry crosses address boundary\n"); | |
2605 | goto out; | |
2606 | } | |
2607 | ||
2608 | if (ent_size != ent_offset - offset) { | |
2609 | dev_err(&dev->dev, | |
2610 | "EA Entry Size (%d) does not match length read (%d)\n", | |
2611 | ent_size, ent_offset - offset); | |
2612 | goto out; | |
2613 | } | |
2614 | ||
2615 | res->name = pci_name(dev); | |
2616 | res->start = start; | |
2617 | res->end = end; | |
2618 | res->flags = flags; | |
597becb4 BH |
2619 | |
2620 | if (bei <= PCI_EA_BEI_BAR5) | |
2621 | dev_printk(KERN_DEBUG, &dev->dev, "BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n", | |
2622 | bei, res, prop); | |
2623 | else if (bei == PCI_EA_BEI_ROM) | |
2624 | dev_printk(KERN_DEBUG, &dev->dev, "ROM: %pR (from Enhanced Allocation, properties %#02x)\n", | |
2625 | res, prop); | |
2626 | else if (bei >= PCI_EA_BEI_VF_BAR0 && bei <= PCI_EA_BEI_VF_BAR5) | |
2627 | dev_printk(KERN_DEBUG, &dev->dev, "VF BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n", | |
2628 | bei - PCI_EA_BEI_VF_BAR0, res, prop); | |
2629 | else | |
2630 | dev_printk(KERN_DEBUG, &dev->dev, "BEI %d res: %pR (from Enhanced Allocation, properties %#02x)\n", | |
2631 | bei, res, prop); | |
2632 | ||
938174e5 SS |
2633 | out: |
2634 | return offset + ent_size; | |
2635 | } | |
2636 | ||
dcbb408a | 2637 | /* Enhanced Allocation Initialization */ |
938174e5 SS |
2638 | void pci_ea_init(struct pci_dev *dev) |
2639 | { | |
2640 | int ea; | |
2641 | u8 num_ent; | |
2642 | int offset; | |
2643 | int i; | |
2644 | ||
2645 | /* find PCI EA capability in list */ | |
2646 | ea = pci_find_capability(dev, PCI_CAP_ID_EA); | |
2647 | if (!ea) | |
2648 | return; | |
2649 | ||
2650 | /* determine the number of entries */ | |
2651 | pci_bus_read_config_byte(dev->bus, dev->devfn, ea + PCI_EA_NUM_ENT, | |
2652 | &num_ent); | |
2653 | num_ent &= PCI_EA_NUM_ENT_MASK; | |
2654 | ||
2655 | offset = ea + PCI_EA_FIRST_ENT; | |
2656 | ||
2657 | /* Skip DWORD 2 for type 1 functions */ | |
2658 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) | |
2659 | offset += 4; | |
2660 | ||
2661 | /* parse each EA entry */ | |
2662 | for (i = 0; i < num_ent; ++i) | |
2663 | offset = pci_ea_read(dev, offset); | |
2664 | } | |
2665 | ||
34a4876e YL |
2666 | static void pci_add_saved_cap(struct pci_dev *pci_dev, |
2667 | struct pci_cap_saved_state *new_cap) | |
2668 | { | |
2669 | hlist_add_head(&new_cap->next, &pci_dev->saved_cap_space); | |
2670 | } | |
2671 | ||
63f4898a | 2672 | /** |
fd0f7f73 AW |
2673 | * _pci_add_cap_save_buffer - allocate buffer for saving given |
2674 | * capability registers | |
63f4898a RW |
2675 | * @dev: the PCI device |
2676 | * @cap: the capability to allocate the buffer for | |
fd0f7f73 | 2677 | * @extended: Standard or Extended capability ID |
63f4898a RW |
2678 | * @size: requested size of the buffer |
2679 | */ | |
fd0f7f73 AW |
2680 | static int _pci_add_cap_save_buffer(struct pci_dev *dev, u16 cap, |
2681 | bool extended, unsigned int size) | |
63f4898a RW |
2682 | { |
2683 | int pos; | |
2684 | struct pci_cap_saved_state *save_state; | |
2685 | ||
fd0f7f73 AW |
2686 | if (extended) |
2687 | pos = pci_find_ext_capability(dev, cap); | |
2688 | else | |
2689 | pos = pci_find_capability(dev, cap); | |
2690 | ||
0a1a9b49 | 2691 | if (!pos) |
63f4898a RW |
2692 | return 0; |
2693 | ||
2694 | save_state = kzalloc(sizeof(*save_state) + size, GFP_KERNEL); | |
2695 | if (!save_state) | |
2696 | return -ENOMEM; | |
2697 | ||
24a4742f | 2698 | save_state->cap.cap_nr = cap; |
fd0f7f73 | 2699 | save_state->cap.cap_extended = extended; |
24a4742f | 2700 | save_state->cap.size = size; |
63f4898a RW |
2701 | pci_add_saved_cap(dev, save_state); |
2702 | ||
2703 | return 0; | |
2704 | } | |
2705 | ||
fd0f7f73 AW |
2706 | int pci_add_cap_save_buffer(struct pci_dev *dev, char cap, unsigned int size) |
2707 | { | |
2708 | return _pci_add_cap_save_buffer(dev, cap, false, size); | |
2709 | } | |
2710 | ||
2711 | int pci_add_ext_cap_save_buffer(struct pci_dev *dev, u16 cap, unsigned int size) | |
2712 | { | |
2713 | return _pci_add_cap_save_buffer(dev, cap, true, size); | |
2714 | } | |
2715 | ||
63f4898a RW |
2716 | /** |
2717 | * pci_allocate_cap_save_buffers - allocate buffers for saving capabilities | |
2718 | * @dev: the PCI device | |
2719 | */ | |
2720 | void pci_allocate_cap_save_buffers(struct pci_dev *dev) | |
2721 | { | |
2722 | int error; | |
2723 | ||
89858517 YZ |
2724 | error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_EXP, |
2725 | PCI_EXP_SAVE_REGS * sizeof(u16)); | |
63f4898a RW |
2726 | if (error) |
2727 | dev_err(&dev->dev, | |
2728 | "unable to preallocate PCI Express save buffer\n"); | |
2729 | ||
2730 | error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_PCIX, sizeof(u16)); | |
2731 | if (error) | |
2732 | dev_err(&dev->dev, | |
2733 | "unable to preallocate PCI-X save buffer\n"); | |
425c1b22 AW |
2734 | |
2735 | pci_allocate_vc_save_buffers(dev); | |
63f4898a RW |
2736 | } |
2737 | ||
f796841e YL |
2738 | void pci_free_cap_save_buffers(struct pci_dev *dev) |
2739 | { | |
2740 | struct pci_cap_saved_state *tmp; | |
b67bfe0d | 2741 | struct hlist_node *n; |
f796841e | 2742 | |
b67bfe0d | 2743 | hlist_for_each_entry_safe(tmp, n, &dev->saved_cap_space, next) |
f796841e YL |
2744 | kfree(tmp); |
2745 | } | |
2746 | ||
58c3a727 | 2747 | /** |
31ab2476 | 2748 | * pci_configure_ari - enable or disable ARI forwarding |
58c3a727 | 2749 | * @dev: the PCI device |
b0cc6020 YW |
2750 | * |
2751 | * If @dev and its upstream bridge both support ARI, enable ARI in the | |
2752 | * bridge. Otherwise, disable ARI in the bridge. | |
58c3a727 | 2753 | */ |
31ab2476 | 2754 | void pci_configure_ari(struct pci_dev *dev) |
58c3a727 | 2755 | { |
58c3a727 | 2756 | u32 cap; |
8113587c | 2757 | struct pci_dev *bridge; |
58c3a727 | 2758 | |
6748dcc2 | 2759 | if (pcie_ari_disabled || !pci_is_pcie(dev) || dev->devfn) |
58c3a727 YZ |
2760 | return; |
2761 | ||
8113587c | 2762 | bridge = dev->bus->self; |
cb97ae34 | 2763 | if (!bridge) |
8113587c ZY |
2764 | return; |
2765 | ||
59875ae4 | 2766 | pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2, &cap); |
58c3a727 YZ |
2767 | if (!(cap & PCI_EXP_DEVCAP2_ARI)) |
2768 | return; | |
2769 | ||
b0cc6020 YW |
2770 | if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI)) { |
2771 | pcie_capability_set_word(bridge, PCI_EXP_DEVCTL2, | |
2772 | PCI_EXP_DEVCTL2_ARI); | |
2773 | bridge->ari_enabled = 1; | |
2774 | } else { | |
2775 | pcie_capability_clear_word(bridge, PCI_EXP_DEVCTL2, | |
2776 | PCI_EXP_DEVCTL2_ARI); | |
2777 | bridge->ari_enabled = 0; | |
2778 | } | |
58c3a727 YZ |
2779 | } |
2780 | ||
5d990b62 CW |
2781 | static int pci_acs_enable; |
2782 | ||
2783 | /** | |
2784 | * pci_request_acs - ask for ACS to be enabled if supported | |
2785 | */ | |
2786 | void pci_request_acs(void) | |
2787 | { | |
2788 | pci_acs_enable = 1; | |
2789 | } | |
2790 | ||
ae21ee65 | 2791 | /** |
2c744244 | 2792 | * pci_std_enable_acs - enable ACS on devices using standard ACS capabilites |
ae21ee65 AK |
2793 | * @dev: the PCI device |
2794 | */ | |
c1d61c9b | 2795 | static void pci_std_enable_acs(struct pci_dev *dev) |
ae21ee65 AK |
2796 | { |
2797 | int pos; | |
2798 | u16 cap; | |
2799 | u16 ctrl; | |
2800 | ||
ae21ee65 AK |
2801 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS); |
2802 | if (!pos) | |
c1d61c9b | 2803 | return; |
ae21ee65 AK |
2804 | |
2805 | pci_read_config_word(dev, pos + PCI_ACS_CAP, &cap); | |
2806 | pci_read_config_word(dev, pos + PCI_ACS_CTRL, &ctrl); | |
2807 | ||
2808 | /* Source Validation */ | |
2809 | ctrl |= (cap & PCI_ACS_SV); | |
2810 | ||
2811 | /* P2P Request Redirect */ | |
2812 | ctrl |= (cap & PCI_ACS_RR); | |
2813 | ||
2814 | /* P2P Completion Redirect */ | |
2815 | ctrl |= (cap & PCI_ACS_CR); | |
2816 | ||
2817 | /* Upstream Forwarding */ | |
2818 | ctrl |= (cap & PCI_ACS_UF); | |
2819 | ||
2820 | pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl); | |
2c744244 AW |
2821 | } |
2822 | ||
2823 | /** | |
2824 | * pci_enable_acs - enable ACS if hardware support it | |
2825 | * @dev: the PCI device | |
2826 | */ | |
2827 | void pci_enable_acs(struct pci_dev *dev) | |
2828 | { | |
2829 | if (!pci_acs_enable) | |
2830 | return; | |
2831 | ||
c1d61c9b | 2832 | if (!pci_dev_specific_enable_acs(dev)) |
2c744244 AW |
2833 | return; |
2834 | ||
c1d61c9b | 2835 | pci_std_enable_acs(dev); |
ae21ee65 AK |
2836 | } |
2837 | ||
0a67119f AW |
2838 | static bool pci_acs_flags_enabled(struct pci_dev *pdev, u16 acs_flags) |
2839 | { | |
2840 | int pos; | |
83db7e0b | 2841 | u16 cap, ctrl; |
0a67119f AW |
2842 | |
2843 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ACS); | |
2844 | if (!pos) | |
2845 | return false; | |
2846 | ||
83db7e0b AW |
2847 | /* |
2848 | * Except for egress control, capabilities are either required | |
2849 | * or only required if controllable. Features missing from the | |
2850 | * capability field can therefore be assumed as hard-wired enabled. | |
2851 | */ | |
2852 | pci_read_config_word(pdev, pos + PCI_ACS_CAP, &cap); | |
2853 | acs_flags &= (cap | PCI_ACS_EC); | |
2854 | ||
0a67119f AW |
2855 | pci_read_config_word(pdev, pos + PCI_ACS_CTRL, &ctrl); |
2856 | return (ctrl & acs_flags) == acs_flags; | |
2857 | } | |
2858 | ||
ad805758 AW |
2859 | /** |
2860 | * pci_acs_enabled - test ACS against required flags for a given device | |
2861 | * @pdev: device to test | |
2862 | * @acs_flags: required PCI ACS flags | |
2863 | * | |
2864 | * Return true if the device supports the provided flags. Automatically | |
2865 | * filters out flags that are not implemented on multifunction devices. | |
0a67119f AW |
2866 | * |
2867 | * Note that this interface checks the effective ACS capabilities of the | |
2868 | * device rather than the actual capabilities. For instance, most single | |
2869 | * function endpoints are not required to support ACS because they have no | |
2870 | * opportunity for peer-to-peer access. We therefore return 'true' | |
2871 | * regardless of whether the device exposes an ACS capability. This makes | |
2872 | * it much easier for callers of this function to ignore the actual type | |
2873 | * or topology of the device when testing ACS support. | |
ad805758 AW |
2874 | */ |
2875 | bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags) | |
2876 | { | |
0a67119f | 2877 | int ret; |
ad805758 AW |
2878 | |
2879 | ret = pci_dev_specific_acs_enabled(pdev, acs_flags); | |
2880 | if (ret >= 0) | |
2881 | return ret > 0; | |
2882 | ||
0a67119f AW |
2883 | /* |
2884 | * Conventional PCI and PCI-X devices never support ACS, either | |
2885 | * effectively or actually. The shared bus topology implies that | |
2886 | * any device on the bus can receive or snoop DMA. | |
2887 | */ | |
ad805758 AW |
2888 | if (!pci_is_pcie(pdev)) |
2889 | return false; | |
2890 | ||
0a67119f AW |
2891 | switch (pci_pcie_type(pdev)) { |
2892 | /* | |
2893 | * PCI/X-to-PCIe bridges are not specifically mentioned by the spec, | |
f7625980 | 2894 | * but since their primary interface is PCI/X, we conservatively |
0a67119f AW |
2895 | * handle them as we would a non-PCIe device. |
2896 | */ | |
2897 | case PCI_EXP_TYPE_PCIE_BRIDGE: | |
2898 | /* | |
2899 | * PCIe 3.0, 6.12.1 excludes ACS on these devices. "ACS is never | |
2900 | * applicable... must never implement an ACS Extended Capability...". | |
2901 | * This seems arbitrary, but we take a conservative interpretation | |
2902 | * of this statement. | |
2903 | */ | |
2904 | case PCI_EXP_TYPE_PCI_BRIDGE: | |
2905 | case PCI_EXP_TYPE_RC_EC: | |
2906 | return false; | |
2907 | /* | |
2908 | * PCIe 3.0, 6.12.1.1 specifies that downstream and root ports should | |
2909 | * implement ACS in order to indicate their peer-to-peer capabilities, | |
2910 | * regardless of whether they are single- or multi-function devices. | |
2911 | */ | |
2912 | case PCI_EXP_TYPE_DOWNSTREAM: | |
2913 | case PCI_EXP_TYPE_ROOT_PORT: | |
2914 | return pci_acs_flags_enabled(pdev, acs_flags); | |
2915 | /* | |
2916 | * PCIe 3.0, 6.12.1.2 specifies ACS capabilities that should be | |
2917 | * implemented by the remaining PCIe types to indicate peer-to-peer | |
f7625980 | 2918 | * capabilities, but only when they are part of a multifunction |
0a67119f AW |
2919 | * device. The footnote for section 6.12 indicates the specific |
2920 | * PCIe types included here. | |
2921 | */ | |
2922 | case PCI_EXP_TYPE_ENDPOINT: | |
2923 | case PCI_EXP_TYPE_UPSTREAM: | |
2924 | case PCI_EXP_TYPE_LEG_END: | |
2925 | case PCI_EXP_TYPE_RC_END: | |
2926 | if (!pdev->multifunction) | |
2927 | break; | |
2928 | ||
0a67119f | 2929 | return pci_acs_flags_enabled(pdev, acs_flags); |
ad805758 AW |
2930 | } |
2931 | ||
0a67119f | 2932 | /* |
f7625980 | 2933 | * PCIe 3.0, 6.12.1.3 specifies no ACS capabilities are applicable |
0a67119f AW |
2934 | * to single function devices with the exception of downstream ports. |
2935 | */ | |
ad805758 AW |
2936 | return true; |
2937 | } | |
2938 | ||
2939 | /** | |
2940 | * pci_acs_path_enable - test ACS flags from start to end in a hierarchy | |
2941 | * @start: starting downstream device | |
2942 | * @end: ending upstream device or NULL to search to the root bus | |
2943 | * @acs_flags: required flags | |
2944 | * | |
2945 | * Walk up a device tree from start to end testing PCI ACS support. If | |
2946 | * any step along the way does not support the required flags, return false. | |
2947 | */ | |
2948 | bool pci_acs_path_enabled(struct pci_dev *start, | |
2949 | struct pci_dev *end, u16 acs_flags) | |
2950 | { | |
2951 | struct pci_dev *pdev, *parent = start; | |
2952 | ||
2953 | do { | |
2954 | pdev = parent; | |
2955 | ||
2956 | if (!pci_acs_enabled(pdev, acs_flags)) | |
2957 | return false; | |
2958 | ||
2959 | if (pci_is_root_bus(pdev->bus)) | |
2960 | return (end == NULL); | |
2961 | ||
2962 | parent = pdev->bus->self; | |
2963 | } while (pdev != end); | |
2964 | ||
2965 | return true; | |
2966 | } | |
2967 | ||
57c2cf71 BH |
2968 | /** |
2969 | * pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge | |
2970 | * @dev: the PCI device | |
bb5c2de2 | 2971 | * @pin: the INTx pin (1=INTA, 2=INTB, 3=INTC, 4=INTD) |
57c2cf71 BH |
2972 | * |
2973 | * Perform INTx swizzling for a device behind one level of bridge. This is | |
2974 | * required by section 9.1 of the PCI-to-PCI bridge specification for devices | |
46b952a3 MW |
2975 | * behind bridges on add-in cards. For devices with ARI enabled, the slot |
2976 | * number is always 0 (see the Implementation Note in section 2.2.8.1 of | |
2977 | * the PCI Express Base Specification, Revision 2.1) | |
57c2cf71 | 2978 | */ |
3df425f3 | 2979 | u8 pci_swizzle_interrupt_pin(const struct pci_dev *dev, u8 pin) |
57c2cf71 | 2980 | { |
46b952a3 MW |
2981 | int slot; |
2982 | ||
2983 | if (pci_ari_enabled(dev->bus)) | |
2984 | slot = 0; | |
2985 | else | |
2986 | slot = PCI_SLOT(dev->devfn); | |
2987 | ||
2988 | return (((pin - 1) + slot) % 4) + 1; | |
57c2cf71 BH |
2989 | } |
2990 | ||
3c78bc61 | 2991 | int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge) |
1da177e4 LT |
2992 | { |
2993 | u8 pin; | |
2994 | ||
514d207d | 2995 | pin = dev->pin; |
1da177e4 LT |
2996 | if (!pin) |
2997 | return -1; | |
878f2e50 | 2998 | |
8784fd4d | 2999 | while (!pci_is_root_bus(dev->bus)) { |
57c2cf71 | 3000 | pin = pci_swizzle_interrupt_pin(dev, pin); |
1da177e4 LT |
3001 | dev = dev->bus->self; |
3002 | } | |
3003 | *bridge = dev; | |
3004 | return pin; | |
3005 | } | |
3006 | ||
68feac87 BH |
3007 | /** |
3008 | * pci_common_swizzle - swizzle INTx all the way to root bridge | |
3009 | * @dev: the PCI device | |
3010 | * @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD) | |
3011 | * | |
3012 | * Perform INTx swizzling for a device. This traverses through all PCI-to-PCI | |
3013 | * bridges all the way up to a PCI root bus. | |
3014 | */ | |
3015 | u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp) | |
3016 | { | |
3017 | u8 pin = *pinp; | |
3018 | ||
1eb39487 | 3019 | while (!pci_is_root_bus(dev->bus)) { |
68feac87 BH |
3020 | pin = pci_swizzle_interrupt_pin(dev, pin); |
3021 | dev = dev->bus->self; | |
3022 | } | |
3023 | *pinp = pin; | |
3024 | return PCI_SLOT(dev->devfn); | |
3025 | } | |
e6b29dea | 3026 | EXPORT_SYMBOL_GPL(pci_common_swizzle); |
68feac87 | 3027 | |
1da177e4 LT |
3028 | /** |
3029 | * pci_release_region - Release a PCI bar | |
3030 | * @pdev: PCI device whose resources were previously reserved by pci_request_region | |
3031 | * @bar: BAR to release | |
3032 | * | |
3033 | * Releases the PCI I/O and memory resources previously reserved by a | |
3034 | * successful call to pci_request_region. Call this function only | |
3035 | * after all use of the PCI regions has ceased. | |
3036 | */ | |
3037 | void pci_release_region(struct pci_dev *pdev, int bar) | |
3038 | { | |
9ac7849e TH |
3039 | struct pci_devres *dr; |
3040 | ||
1da177e4 LT |
3041 | if (pci_resource_len(pdev, bar) == 0) |
3042 | return; | |
3043 | if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) | |
3044 | release_region(pci_resource_start(pdev, bar), | |
3045 | pci_resource_len(pdev, bar)); | |
3046 | else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) | |
3047 | release_mem_region(pci_resource_start(pdev, bar), | |
3048 | pci_resource_len(pdev, bar)); | |
9ac7849e TH |
3049 | |
3050 | dr = find_pci_dr(pdev); | |
3051 | if (dr) | |
3052 | dr->region_mask &= ~(1 << bar); | |
1da177e4 | 3053 | } |
b7fe9434 | 3054 | EXPORT_SYMBOL(pci_release_region); |
1da177e4 LT |
3055 | |
3056 | /** | |
f5ddcac4 | 3057 | * __pci_request_region - Reserved PCI I/O and memory resource |
1da177e4 LT |
3058 | * @pdev: PCI device whose resources are to be reserved |
3059 | * @bar: BAR to be reserved | |
3060 | * @res_name: Name to be associated with resource. | |
f5ddcac4 | 3061 | * @exclusive: whether the region access is exclusive or not |
1da177e4 LT |
3062 | * |
3063 | * Mark the PCI region associated with PCI device @pdev BR @bar as | |
3064 | * being reserved by owner @res_name. Do not access any | |
3065 | * address inside the PCI regions unless this call returns | |
3066 | * successfully. | |
3067 | * | |
f5ddcac4 RD |
3068 | * If @exclusive is set, then the region is marked so that userspace |
3069 | * is explicitly not allowed to map the resource via /dev/mem or | |
f7625980 | 3070 | * sysfs MMIO access. |
f5ddcac4 | 3071 | * |
1da177e4 LT |
3072 | * Returns 0 on success, or %EBUSY on error. A warning |
3073 | * message is also printed on failure. | |
3074 | */ | |
3c78bc61 RD |
3075 | static int __pci_request_region(struct pci_dev *pdev, int bar, |
3076 | const char *res_name, int exclusive) | |
1da177e4 | 3077 | { |
9ac7849e TH |
3078 | struct pci_devres *dr; |
3079 | ||
1da177e4 LT |
3080 | if (pci_resource_len(pdev, bar) == 0) |
3081 | return 0; | |
f7625980 | 3082 | |
1da177e4 LT |
3083 | if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) { |
3084 | if (!request_region(pci_resource_start(pdev, bar), | |
3085 | pci_resource_len(pdev, bar), res_name)) | |
3086 | goto err_out; | |
3c78bc61 | 3087 | } else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) { |
e8de1481 AV |
3088 | if (!__request_mem_region(pci_resource_start(pdev, bar), |
3089 | pci_resource_len(pdev, bar), res_name, | |
3090 | exclusive)) | |
1da177e4 LT |
3091 | goto err_out; |
3092 | } | |
9ac7849e TH |
3093 | |
3094 | dr = find_pci_dr(pdev); | |
3095 | if (dr) | |
3096 | dr->region_mask |= 1 << bar; | |
3097 | ||
1da177e4 LT |
3098 | return 0; |
3099 | ||
3100 | err_out: | |
c7dabef8 | 3101 | dev_warn(&pdev->dev, "BAR %d: can't reserve %pR\n", bar, |
096e6f67 | 3102 | &pdev->resource[bar]); |
1da177e4 LT |
3103 | return -EBUSY; |
3104 | } | |
3105 | ||
e8de1481 | 3106 | /** |
f5ddcac4 | 3107 | * pci_request_region - Reserve PCI I/O and memory resource |
e8de1481 AV |
3108 | * @pdev: PCI device whose resources are to be reserved |
3109 | * @bar: BAR to be reserved | |
f5ddcac4 | 3110 | * @res_name: Name to be associated with resource |
e8de1481 | 3111 | * |
f5ddcac4 | 3112 | * Mark the PCI region associated with PCI device @pdev BAR @bar as |
e8de1481 AV |
3113 | * being reserved by owner @res_name. Do not access any |
3114 | * address inside the PCI regions unless this call returns | |
3115 | * successfully. | |
3116 | * | |
3117 | * Returns 0 on success, or %EBUSY on error. A warning | |
3118 | * message is also printed on failure. | |
3119 | */ | |
3120 | int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name) | |
3121 | { | |
3122 | return __pci_request_region(pdev, bar, res_name, 0); | |
3123 | } | |
b7fe9434 | 3124 | EXPORT_SYMBOL(pci_request_region); |
e8de1481 AV |
3125 | |
3126 | /** | |
3127 | * pci_request_region_exclusive - Reserved PCI I/O and memory resource | |
3128 | * @pdev: PCI device whose resources are to be reserved | |
3129 | * @bar: BAR to be reserved | |
3130 | * @res_name: Name to be associated with resource. | |
3131 | * | |
3132 | * Mark the PCI region associated with PCI device @pdev BR @bar as | |
3133 | * being reserved by owner @res_name. Do not access any | |
3134 | * address inside the PCI regions unless this call returns | |
3135 | * successfully. | |
3136 | * | |
3137 | * Returns 0 on success, or %EBUSY on error. A warning | |
3138 | * message is also printed on failure. | |
3139 | * | |
3140 | * The key difference that _exclusive makes it that userspace is | |
3141 | * explicitly not allowed to map the resource via /dev/mem or | |
f7625980 | 3142 | * sysfs. |
e8de1481 | 3143 | */ |
3c78bc61 RD |
3144 | int pci_request_region_exclusive(struct pci_dev *pdev, int bar, |
3145 | const char *res_name) | |
e8de1481 AV |
3146 | { |
3147 | return __pci_request_region(pdev, bar, res_name, IORESOURCE_EXCLUSIVE); | |
3148 | } | |
b7fe9434 RD |
3149 | EXPORT_SYMBOL(pci_request_region_exclusive); |
3150 | ||
c87deff7 HS |
3151 | /** |
3152 | * pci_release_selected_regions - Release selected PCI I/O and memory resources | |
3153 | * @pdev: PCI device whose resources were previously reserved | |
3154 | * @bars: Bitmask of BARs to be released | |
3155 | * | |
3156 | * Release selected PCI I/O and memory resources previously reserved. | |
3157 | * Call this function only after all use of the PCI regions has ceased. | |
3158 | */ | |
3159 | void pci_release_selected_regions(struct pci_dev *pdev, int bars) | |
3160 | { | |
3161 | int i; | |
3162 | ||
3163 | for (i = 0; i < 6; i++) | |
3164 | if (bars & (1 << i)) | |
3165 | pci_release_region(pdev, i); | |
3166 | } | |
b7fe9434 | 3167 | EXPORT_SYMBOL(pci_release_selected_regions); |
c87deff7 | 3168 | |
9738abed | 3169 | static int __pci_request_selected_regions(struct pci_dev *pdev, int bars, |
3c78bc61 | 3170 | const char *res_name, int excl) |
c87deff7 HS |
3171 | { |
3172 | int i; | |
3173 | ||
3174 | for (i = 0; i < 6; i++) | |
3175 | if (bars & (1 << i)) | |
e8de1481 | 3176 | if (__pci_request_region(pdev, i, res_name, excl)) |
c87deff7 HS |
3177 | goto err_out; |
3178 | return 0; | |
3179 | ||
3180 | err_out: | |
3c78bc61 | 3181 | while (--i >= 0) |
c87deff7 HS |
3182 | if (bars & (1 << i)) |
3183 | pci_release_region(pdev, i); | |
3184 | ||
3185 | return -EBUSY; | |
3186 | } | |
1da177e4 | 3187 | |
e8de1481 AV |
3188 | |
3189 | /** | |
3190 | * pci_request_selected_regions - Reserve selected PCI I/O and memory resources | |
3191 | * @pdev: PCI device whose resources are to be reserved | |
3192 | * @bars: Bitmask of BARs to be requested | |
3193 | * @res_name: Name to be associated with resource | |
3194 | */ | |
3195 | int pci_request_selected_regions(struct pci_dev *pdev, int bars, | |
3196 | const char *res_name) | |
3197 | { | |
3198 | return __pci_request_selected_regions(pdev, bars, res_name, 0); | |
3199 | } | |
b7fe9434 | 3200 | EXPORT_SYMBOL(pci_request_selected_regions); |
e8de1481 | 3201 | |
3c78bc61 RD |
3202 | int pci_request_selected_regions_exclusive(struct pci_dev *pdev, int bars, |
3203 | const char *res_name) | |
e8de1481 AV |
3204 | { |
3205 | return __pci_request_selected_regions(pdev, bars, res_name, | |
3206 | IORESOURCE_EXCLUSIVE); | |
3207 | } | |
b7fe9434 | 3208 | EXPORT_SYMBOL(pci_request_selected_regions_exclusive); |
e8de1481 | 3209 | |
1da177e4 LT |
3210 | /** |
3211 | * pci_release_regions - Release reserved PCI I/O and memory resources | |
3212 | * @pdev: PCI device whose resources were previously reserved by pci_request_regions | |
3213 | * | |
3214 | * Releases all PCI I/O and memory resources previously reserved by a | |
3215 | * successful call to pci_request_regions. Call this function only | |
3216 | * after all use of the PCI regions has ceased. | |
3217 | */ | |
3218 | ||
3219 | void pci_release_regions(struct pci_dev *pdev) | |
3220 | { | |
c87deff7 | 3221 | pci_release_selected_regions(pdev, (1 << 6) - 1); |
1da177e4 | 3222 | } |
b7fe9434 | 3223 | EXPORT_SYMBOL(pci_release_regions); |
1da177e4 LT |
3224 | |
3225 | /** | |
3226 | * pci_request_regions - Reserved PCI I/O and memory resources | |
3227 | * @pdev: PCI device whose resources are to be reserved | |
3228 | * @res_name: Name to be associated with resource. | |
3229 | * | |
3230 | * Mark all PCI regions associated with PCI device @pdev as | |
3231 | * being reserved by owner @res_name. Do not access any | |
3232 | * address inside the PCI regions unless this call returns | |
3233 | * successfully. | |
3234 | * | |
3235 | * Returns 0 on success, or %EBUSY on error. A warning | |
3236 | * message is also printed on failure. | |
3237 | */ | |
3c990e92 | 3238 | int pci_request_regions(struct pci_dev *pdev, const char *res_name) |
1da177e4 | 3239 | { |
c87deff7 | 3240 | return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name); |
1da177e4 | 3241 | } |
b7fe9434 | 3242 | EXPORT_SYMBOL(pci_request_regions); |
1da177e4 | 3243 | |
e8de1481 AV |
3244 | /** |
3245 | * pci_request_regions_exclusive - Reserved PCI I/O and memory resources | |
3246 | * @pdev: PCI device whose resources are to be reserved | |
3247 | * @res_name: Name to be associated with resource. | |
3248 | * | |
3249 | * Mark all PCI regions associated with PCI device @pdev as | |
3250 | * being reserved by owner @res_name. Do not access any | |
3251 | * address inside the PCI regions unless this call returns | |
3252 | * successfully. | |
3253 | * | |
3254 | * pci_request_regions_exclusive() will mark the region so that | |
f7625980 | 3255 | * /dev/mem and the sysfs MMIO access will not be allowed. |
e8de1481 AV |
3256 | * |
3257 | * Returns 0 on success, or %EBUSY on error. A warning | |
3258 | * message is also printed on failure. | |
3259 | */ | |
3260 | int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name) | |
3261 | { | |
3262 | return pci_request_selected_regions_exclusive(pdev, | |
3263 | ((1 << 6) - 1), res_name); | |
3264 | } | |
b7fe9434 | 3265 | EXPORT_SYMBOL(pci_request_regions_exclusive); |
e8de1481 | 3266 | |
c5076cfe TN |
3267 | #ifdef PCI_IOBASE |
3268 | struct io_range { | |
3269 | struct list_head list; | |
3270 | phys_addr_t start; | |
3271 | resource_size_t size; | |
3272 | }; | |
3273 | ||
3274 | static LIST_HEAD(io_range_list); | |
3275 | static DEFINE_SPINLOCK(io_range_lock); | |
3276 | #endif | |
3277 | ||
3278 | /* | |
3279 | * Record the PCI IO range (expressed as CPU physical address + size). | |
3280 | * Return a negative value if an error has occured, zero otherwise | |
3281 | */ | |
3282 | int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size) | |
3283 | { | |
3284 | int err = 0; | |
3285 | ||
3286 | #ifdef PCI_IOBASE | |
3287 | struct io_range *range; | |
3288 | resource_size_t allocated_size = 0; | |
3289 | ||
3290 | /* check if the range hasn't been previously recorded */ | |
3291 | spin_lock(&io_range_lock); | |
3292 | list_for_each_entry(range, &io_range_list, list) { | |
3293 | if (addr >= range->start && addr + size <= range->start + size) { | |
3294 | /* range already registered, bail out */ | |
3295 | goto end_register; | |
3296 | } | |
3297 | allocated_size += range->size; | |
3298 | } | |
3299 | ||
3300 | /* range not registed yet, check for available space */ | |
3301 | if (allocated_size + size - 1 > IO_SPACE_LIMIT) { | |
3302 | /* if it's too big check if 64K space can be reserved */ | |
3303 | if (allocated_size + SZ_64K - 1 > IO_SPACE_LIMIT) { | |
3304 | err = -E2BIG; | |
3305 | goto end_register; | |
3306 | } | |
3307 | ||
3308 | size = SZ_64K; | |
3309 | pr_warn("Requested IO range too big, new size set to 64K\n"); | |
3310 | } | |
3311 | ||
3312 | /* add the range to the list */ | |
3313 | range = kzalloc(sizeof(*range), GFP_ATOMIC); | |
3314 | if (!range) { | |
3315 | err = -ENOMEM; | |
3316 | goto end_register; | |
3317 | } | |
3318 | ||
3319 | range->start = addr; | |
3320 | range->size = size; | |
3321 | ||
3322 | list_add_tail(&range->list, &io_range_list); | |
3323 | ||
3324 | end_register: | |
3325 | spin_unlock(&io_range_lock); | |
3326 | #endif | |
3327 | ||
3328 | return err; | |
3329 | } | |
3330 | ||
3331 | phys_addr_t pci_pio_to_address(unsigned long pio) | |
3332 | { | |
3333 | phys_addr_t address = (phys_addr_t)OF_BAD_ADDR; | |
3334 | ||
3335 | #ifdef PCI_IOBASE | |
3336 | struct io_range *range; | |
3337 | resource_size_t allocated_size = 0; | |
3338 | ||
3339 | if (pio > IO_SPACE_LIMIT) | |
3340 | return address; | |
3341 | ||
3342 | spin_lock(&io_range_lock); | |
3343 | list_for_each_entry(range, &io_range_list, list) { | |
3344 | if (pio >= allocated_size && pio < allocated_size + range->size) { | |
3345 | address = range->start + pio - allocated_size; | |
3346 | break; | |
3347 | } | |
3348 | allocated_size += range->size; | |
3349 | } | |
3350 | spin_unlock(&io_range_lock); | |
3351 | #endif | |
3352 | ||
3353 | return address; | |
3354 | } | |
3355 | ||
3356 | unsigned long __weak pci_address_to_pio(phys_addr_t address) | |
3357 | { | |
3358 | #ifdef PCI_IOBASE | |
3359 | struct io_range *res; | |
3360 | resource_size_t offset = 0; | |
3361 | unsigned long addr = -1; | |
3362 | ||
3363 | spin_lock(&io_range_lock); | |
3364 | list_for_each_entry(res, &io_range_list, list) { | |
3365 | if (address >= res->start && address < res->start + res->size) { | |
3366 | addr = address - res->start + offset; | |
3367 | break; | |
3368 | } | |
3369 | offset += res->size; | |
3370 | } | |
3371 | spin_unlock(&io_range_lock); | |
3372 | ||
3373 | return addr; | |
3374 | #else | |
3375 | if (address > IO_SPACE_LIMIT) | |
3376 | return (unsigned long)-1; | |
3377 | ||
3378 | return (unsigned long) address; | |
3379 | #endif | |
3380 | } | |
3381 | ||
8b921acf LD |
3382 | /** |
3383 | * pci_remap_iospace - Remap the memory mapped I/O space | |
3384 | * @res: Resource describing the I/O space | |
3385 | * @phys_addr: physical address of range to be mapped | |
3386 | * | |
3387 | * Remap the memory mapped I/O space described by the @res | |
3388 | * and the CPU physical address @phys_addr into virtual address space. | |
3389 | * Only architectures that have memory mapped IO functions defined | |
3390 | * (and the PCI_IOBASE value defined) should call this function. | |
3391 | */ | |
7b309aef | 3392 | int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr) |
8b921acf LD |
3393 | { |
3394 | #if defined(PCI_IOBASE) && defined(CONFIG_MMU) | |
3395 | unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start; | |
3396 | ||
3397 | if (!(res->flags & IORESOURCE_IO)) | |
3398 | return -EINVAL; | |
3399 | ||
3400 | if (res->end > IO_SPACE_LIMIT) | |
3401 | return -EINVAL; | |
3402 | ||
3403 | return ioremap_page_range(vaddr, vaddr + resource_size(res), phys_addr, | |
3404 | pgprot_device(PAGE_KERNEL)); | |
3405 | #else | |
3406 | /* this architecture does not have memory mapped I/O space, | |
3407 | so this function should never be called */ | |
3408 | WARN_ONCE(1, "This architecture does not support memory mapped I/O\n"); | |
3409 | return -ENODEV; | |
3410 | #endif | |
3411 | } | |
f90b0875 | 3412 | EXPORT_SYMBOL(pci_remap_iospace); |
8b921acf | 3413 | |
4d3f1384 SK |
3414 | /** |
3415 | * pci_unmap_iospace - Unmap the memory mapped I/O space | |
3416 | * @res: resource to be unmapped | |
3417 | * | |
3418 | * Unmap the CPU virtual address @res from virtual address space. | |
3419 | * Only architectures that have memory mapped IO functions defined | |
3420 | * (and the PCI_IOBASE value defined) should call this function. | |
3421 | */ | |
3422 | void pci_unmap_iospace(struct resource *res) | |
3423 | { | |
3424 | #if defined(PCI_IOBASE) && defined(CONFIG_MMU) | |
3425 | unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start; | |
3426 | ||
3427 | unmap_kernel_range(vaddr, resource_size(res)); | |
3428 | #endif | |
3429 | } | |
f90b0875 | 3430 | EXPORT_SYMBOL(pci_unmap_iospace); |
4d3f1384 | 3431 | |
490cb6dd LP |
3432 | /** |
3433 | * devm_pci_remap_cfgspace - Managed pci_remap_cfgspace() | |
3434 | * @dev: Generic device to remap IO address for | |
3435 | * @offset: Resource address to map | |
3436 | * @size: Size of map | |
3437 | * | |
3438 | * Managed pci_remap_cfgspace(). Map is automatically unmapped on driver | |
3439 | * detach. | |
3440 | */ | |
3441 | void __iomem *devm_pci_remap_cfgspace(struct device *dev, | |
3442 | resource_size_t offset, | |
3443 | resource_size_t size) | |
3444 | { | |
3445 | void __iomem **ptr, *addr; | |
3446 | ||
3447 | ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL); | |
3448 | if (!ptr) | |
3449 | return NULL; | |
3450 | ||
3451 | addr = pci_remap_cfgspace(offset, size); | |
3452 | if (addr) { | |
3453 | *ptr = addr; | |
3454 | devres_add(dev, ptr); | |
3455 | } else | |
3456 | devres_free(ptr); | |
3457 | ||
3458 | return addr; | |
3459 | } | |
3460 | EXPORT_SYMBOL(devm_pci_remap_cfgspace); | |
3461 | ||
3462 | /** | |
3463 | * devm_pci_remap_cfg_resource - check, request region and ioremap cfg resource | |
3464 | * @dev: generic device to handle the resource for | |
3465 | * @res: configuration space resource to be handled | |
3466 | * | |
3467 | * Checks that a resource is a valid memory region, requests the memory | |
3468 | * region and ioremaps with pci_remap_cfgspace() API that ensures the | |
3469 | * proper PCI configuration space memory attributes are guaranteed. | |
3470 | * | |
3471 | * All operations are managed and will be undone on driver detach. | |
3472 | * | |
3473 | * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code | |
3474 | * on failure. Usage example: | |
3475 | * | |
3476 | * res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
3477 | * base = devm_pci_remap_cfg_resource(&pdev->dev, res); | |
3478 | * if (IS_ERR(base)) | |
3479 | * return PTR_ERR(base); | |
3480 | */ | |
3481 | void __iomem *devm_pci_remap_cfg_resource(struct device *dev, | |
3482 | struct resource *res) | |
3483 | { | |
3484 | resource_size_t size; | |
3485 | const char *name; | |
3486 | void __iomem *dest_ptr; | |
3487 | ||
3488 | BUG_ON(!dev); | |
3489 | ||
3490 | if (!res || resource_type(res) != IORESOURCE_MEM) { | |
3491 | dev_err(dev, "invalid resource\n"); | |
3492 | return IOMEM_ERR_PTR(-EINVAL); | |
3493 | } | |
3494 | ||
3495 | size = resource_size(res); | |
3496 | name = res->name ?: dev_name(dev); | |
3497 | ||
3498 | if (!devm_request_mem_region(dev, res->start, size, name)) { | |
3499 | dev_err(dev, "can't request region for resource %pR\n", res); | |
3500 | return IOMEM_ERR_PTR(-EBUSY); | |
3501 | } | |
3502 | ||
3503 | dest_ptr = devm_pci_remap_cfgspace(dev, res->start, size); | |
3504 | if (!dest_ptr) { | |
3505 | dev_err(dev, "ioremap failed for resource %pR\n", res); | |
3506 | devm_release_mem_region(dev, res->start, size); | |
3507 | dest_ptr = IOMEM_ERR_PTR(-ENOMEM); | |
3508 | } | |
3509 | ||
3510 | return dest_ptr; | |
3511 | } | |
3512 | EXPORT_SYMBOL(devm_pci_remap_cfg_resource); | |
3513 | ||
6a479079 BH |
3514 | static void __pci_set_master(struct pci_dev *dev, bool enable) |
3515 | { | |
3516 | u16 old_cmd, cmd; | |
3517 | ||
3518 | pci_read_config_word(dev, PCI_COMMAND, &old_cmd); | |
3519 | if (enable) | |
3520 | cmd = old_cmd | PCI_COMMAND_MASTER; | |
3521 | else | |
3522 | cmd = old_cmd & ~PCI_COMMAND_MASTER; | |
3523 | if (cmd != old_cmd) { | |
3524 | dev_dbg(&dev->dev, "%s bus mastering\n", | |
3525 | enable ? "enabling" : "disabling"); | |
3526 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
3527 | } | |
3528 | dev->is_busmaster = enable; | |
3529 | } | |
e8de1481 | 3530 | |
2b6f2c35 MS |
3531 | /** |
3532 | * pcibios_setup - process "pci=" kernel boot arguments | |
3533 | * @str: string used to pass in "pci=" kernel boot arguments | |
3534 | * | |
3535 | * Process kernel boot arguments. This is the default implementation. | |
3536 | * Architecture specific implementations can override this as necessary. | |
3537 | */ | |
3538 | char * __weak __init pcibios_setup(char *str) | |
3539 | { | |
3540 | return str; | |
3541 | } | |
3542 | ||
96c55900 MS |
3543 | /** |
3544 | * pcibios_set_master - enable PCI bus-mastering for device dev | |
3545 | * @dev: the PCI device to enable | |
3546 | * | |
3547 | * Enables PCI bus-mastering for the device. This is the default | |
3548 | * implementation. Architecture specific implementations can override | |
3549 | * this if necessary. | |
3550 | */ | |
3551 | void __weak pcibios_set_master(struct pci_dev *dev) | |
3552 | { | |
3553 | u8 lat; | |
3554 | ||
f676678f MS |
3555 | /* The latency timer doesn't apply to PCIe (either Type 0 or Type 1) */ |
3556 | if (pci_is_pcie(dev)) | |
3557 | return; | |
3558 | ||
96c55900 MS |
3559 | pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat); |
3560 | if (lat < 16) | |
3561 | lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency; | |
3562 | else if (lat > pcibios_max_latency) | |
3563 | lat = pcibios_max_latency; | |
3564 | else | |
3565 | return; | |
a006482b | 3566 | |
96c55900 MS |
3567 | pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat); |
3568 | } | |
3569 | ||
1da177e4 LT |
3570 | /** |
3571 | * pci_set_master - enables bus-mastering for device dev | |
3572 | * @dev: the PCI device to enable | |
3573 | * | |
3574 | * Enables bus-mastering on the device and calls pcibios_set_master() | |
3575 | * to do the needed arch specific settings. | |
3576 | */ | |
6a479079 | 3577 | void pci_set_master(struct pci_dev *dev) |
1da177e4 | 3578 | { |
6a479079 | 3579 | __pci_set_master(dev, true); |
1da177e4 LT |
3580 | pcibios_set_master(dev); |
3581 | } | |
b7fe9434 | 3582 | EXPORT_SYMBOL(pci_set_master); |
1da177e4 | 3583 | |
6a479079 BH |
3584 | /** |
3585 | * pci_clear_master - disables bus-mastering for device dev | |
3586 | * @dev: the PCI device to disable | |
3587 | */ | |
3588 | void pci_clear_master(struct pci_dev *dev) | |
3589 | { | |
3590 | __pci_set_master(dev, false); | |
3591 | } | |
b7fe9434 | 3592 | EXPORT_SYMBOL(pci_clear_master); |
6a479079 | 3593 | |
1da177e4 | 3594 | /** |
edb2d97e MW |
3595 | * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed |
3596 | * @dev: the PCI device for which MWI is to be enabled | |
1da177e4 | 3597 | * |
edb2d97e MW |
3598 | * Helper function for pci_set_mwi. |
3599 | * Originally copied from drivers/net/acenic.c. | |
1da177e4 LT |
3600 | * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>. |
3601 | * | |
3602 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
3603 | */ | |
15ea76d4 | 3604 | int pci_set_cacheline_size(struct pci_dev *dev) |
1da177e4 LT |
3605 | { |
3606 | u8 cacheline_size; | |
3607 | ||
3608 | if (!pci_cache_line_size) | |
15ea76d4 | 3609 | return -EINVAL; |
1da177e4 LT |
3610 | |
3611 | /* Validate current setting: the PCI_CACHE_LINE_SIZE must be | |
3612 | equal to or multiple of the right value. */ | |
3613 | pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size); | |
3614 | if (cacheline_size >= pci_cache_line_size && | |
3615 | (cacheline_size % pci_cache_line_size) == 0) | |
3616 | return 0; | |
3617 | ||
3618 | /* Write the correct value. */ | |
3619 | pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size); | |
3620 | /* Read it back. */ | |
3621 | pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size); | |
3622 | if (cacheline_size == pci_cache_line_size) | |
3623 | return 0; | |
3624 | ||
227f0647 RD |
3625 | dev_printk(KERN_DEBUG, &dev->dev, "cache line size of %d is not supported\n", |
3626 | pci_cache_line_size << 2); | |
1da177e4 LT |
3627 | |
3628 | return -EINVAL; | |
3629 | } | |
15ea76d4 TH |
3630 | EXPORT_SYMBOL_GPL(pci_set_cacheline_size); |
3631 | ||
1da177e4 LT |
3632 | /** |
3633 | * pci_set_mwi - enables memory-write-invalidate PCI transaction | |
3634 | * @dev: the PCI device for which MWI is enabled | |
3635 | * | |
694625c0 | 3636 | * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND. |
1da177e4 LT |
3637 | * |
3638 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
3639 | */ | |
3c78bc61 | 3640 | int pci_set_mwi(struct pci_dev *dev) |
1da177e4 | 3641 | { |
b7fe9434 RD |
3642 | #ifdef PCI_DISABLE_MWI |
3643 | return 0; | |
3644 | #else | |
1da177e4 LT |
3645 | int rc; |
3646 | u16 cmd; | |
3647 | ||
edb2d97e | 3648 | rc = pci_set_cacheline_size(dev); |
1da177e4 LT |
3649 | if (rc) |
3650 | return rc; | |
3651 | ||
3652 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
3c78bc61 | 3653 | if (!(cmd & PCI_COMMAND_INVALIDATE)) { |
80ccba11 | 3654 | dev_dbg(&dev->dev, "enabling Mem-Wr-Inval\n"); |
1da177e4 LT |
3655 | cmd |= PCI_COMMAND_INVALIDATE; |
3656 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
3657 | } | |
1da177e4 | 3658 | return 0; |
b7fe9434 | 3659 | #endif |
1da177e4 | 3660 | } |
b7fe9434 | 3661 | EXPORT_SYMBOL(pci_set_mwi); |
1da177e4 | 3662 | |
694625c0 RD |
3663 | /** |
3664 | * pci_try_set_mwi - enables memory-write-invalidate PCI transaction | |
3665 | * @dev: the PCI device for which MWI is enabled | |
3666 | * | |
3667 | * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND. | |
3668 | * Callers are not required to check the return value. | |
3669 | * | |
3670 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
3671 | */ | |
3672 | int pci_try_set_mwi(struct pci_dev *dev) | |
3673 | { | |
b7fe9434 RD |
3674 | #ifdef PCI_DISABLE_MWI |
3675 | return 0; | |
3676 | #else | |
3677 | return pci_set_mwi(dev); | |
3678 | #endif | |
694625c0 | 3679 | } |
b7fe9434 | 3680 | EXPORT_SYMBOL(pci_try_set_mwi); |
694625c0 | 3681 | |
1da177e4 LT |
3682 | /** |
3683 | * pci_clear_mwi - disables Memory-Write-Invalidate for device dev | |
3684 | * @dev: the PCI device to disable | |
3685 | * | |
3686 | * Disables PCI Memory-Write-Invalidate transaction on the device | |
3687 | */ | |
3c78bc61 | 3688 | void pci_clear_mwi(struct pci_dev *dev) |
1da177e4 | 3689 | { |
b7fe9434 | 3690 | #ifndef PCI_DISABLE_MWI |
1da177e4 LT |
3691 | u16 cmd; |
3692 | ||
3693 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
3694 | if (cmd & PCI_COMMAND_INVALIDATE) { | |
3695 | cmd &= ~PCI_COMMAND_INVALIDATE; | |
3696 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
3697 | } | |
b7fe9434 | 3698 | #endif |
1da177e4 | 3699 | } |
b7fe9434 | 3700 | EXPORT_SYMBOL(pci_clear_mwi); |
1da177e4 | 3701 | |
a04ce0ff BR |
3702 | /** |
3703 | * pci_intx - enables/disables PCI INTx for device dev | |
8f7020d3 RD |
3704 | * @pdev: the PCI device to operate on |
3705 | * @enable: boolean: whether to enable or disable PCI INTx | |
a04ce0ff BR |
3706 | * |
3707 | * Enables/disables PCI INTx for device dev | |
3708 | */ | |
3c78bc61 | 3709 | void pci_intx(struct pci_dev *pdev, int enable) |
a04ce0ff BR |
3710 | { |
3711 | u16 pci_command, new; | |
3712 | ||
3713 | pci_read_config_word(pdev, PCI_COMMAND, &pci_command); | |
3714 | ||
3c78bc61 | 3715 | if (enable) |
a04ce0ff | 3716 | new = pci_command & ~PCI_COMMAND_INTX_DISABLE; |
3c78bc61 | 3717 | else |
a04ce0ff | 3718 | new = pci_command | PCI_COMMAND_INTX_DISABLE; |
a04ce0ff BR |
3719 | |
3720 | if (new != pci_command) { | |
9ac7849e TH |
3721 | struct pci_devres *dr; |
3722 | ||
2fd9d74b | 3723 | pci_write_config_word(pdev, PCI_COMMAND, new); |
9ac7849e TH |
3724 | |
3725 | dr = find_pci_dr(pdev); | |
3726 | if (dr && !dr->restore_intx) { | |
3727 | dr->restore_intx = 1; | |
3728 | dr->orig_intx = !enable; | |
3729 | } | |
a04ce0ff BR |
3730 | } |
3731 | } | |
b7fe9434 | 3732 | EXPORT_SYMBOL_GPL(pci_intx); |
a04ce0ff | 3733 | |
a2e27787 JK |
3734 | /** |
3735 | * pci_intx_mask_supported - probe for INTx masking support | |
6e9292c5 | 3736 | * @dev: the PCI device to operate on |
a2e27787 JK |
3737 | * |
3738 | * Check if the device dev support INTx masking via the config space | |
3739 | * command word. | |
3740 | */ | |
3741 | bool pci_intx_mask_supported(struct pci_dev *dev) | |
3742 | { | |
3743 | bool mask_supported = false; | |
3744 | u16 orig, new; | |
3745 | ||
fbebb9fd BH |
3746 | if (dev->broken_intx_masking) |
3747 | return false; | |
3748 | ||
a2e27787 JK |
3749 | pci_cfg_access_lock(dev); |
3750 | ||
3751 | pci_read_config_word(dev, PCI_COMMAND, &orig); | |
3752 | pci_write_config_word(dev, PCI_COMMAND, | |
3753 | orig ^ PCI_COMMAND_INTX_DISABLE); | |
3754 | pci_read_config_word(dev, PCI_COMMAND, &new); | |
3755 | ||
3756 | /* | |
3757 | * There's no way to protect against hardware bugs or detect them | |
3758 | * reliably, but as long as we know what the value should be, let's | |
3759 | * go ahead and check it. | |
3760 | */ | |
3761 | if ((new ^ orig) & ~PCI_COMMAND_INTX_DISABLE) { | |
227f0647 RD |
3762 | dev_err(&dev->dev, "Command register changed from 0x%x to 0x%x: driver or hardware bug?\n", |
3763 | orig, new); | |
a2e27787 JK |
3764 | } else if ((new ^ orig) & PCI_COMMAND_INTX_DISABLE) { |
3765 | mask_supported = true; | |
3766 | pci_write_config_word(dev, PCI_COMMAND, orig); | |
3767 | } | |
3768 | ||
3769 | pci_cfg_access_unlock(dev); | |
3770 | return mask_supported; | |
3771 | } | |
3772 | EXPORT_SYMBOL_GPL(pci_intx_mask_supported); | |
3773 | ||
3774 | static bool pci_check_and_set_intx_mask(struct pci_dev *dev, bool mask) | |
3775 | { | |
3776 | struct pci_bus *bus = dev->bus; | |
3777 | bool mask_updated = true; | |
3778 | u32 cmd_status_dword; | |
3779 | u16 origcmd, newcmd; | |
3780 | unsigned long flags; | |
3781 | bool irq_pending; | |
3782 | ||
3783 | /* | |
3784 | * We do a single dword read to retrieve both command and status. | |
3785 | * Document assumptions that make this possible. | |
3786 | */ | |
3787 | BUILD_BUG_ON(PCI_COMMAND % 4); | |
3788 | BUILD_BUG_ON(PCI_COMMAND + 2 != PCI_STATUS); | |
3789 | ||
3790 | raw_spin_lock_irqsave(&pci_lock, flags); | |
3791 | ||
3792 | bus->ops->read(bus, dev->devfn, PCI_COMMAND, 4, &cmd_status_dword); | |
3793 | ||
3794 | irq_pending = (cmd_status_dword >> 16) & PCI_STATUS_INTERRUPT; | |
3795 | ||
3796 | /* | |
3797 | * Check interrupt status register to see whether our device | |
3798 | * triggered the interrupt (when masking) or the next IRQ is | |
3799 | * already pending (when unmasking). | |
3800 | */ | |
3801 | if (mask != irq_pending) { | |
3802 | mask_updated = false; | |
3803 | goto done; | |
3804 | } | |
3805 | ||
3806 | origcmd = cmd_status_dword; | |
3807 | newcmd = origcmd & ~PCI_COMMAND_INTX_DISABLE; | |
3808 | if (mask) | |
3809 | newcmd |= PCI_COMMAND_INTX_DISABLE; | |
3810 | if (newcmd != origcmd) | |
3811 | bus->ops->write(bus, dev->devfn, PCI_COMMAND, 2, newcmd); | |
3812 | ||
3813 | done: | |
3814 | raw_spin_unlock_irqrestore(&pci_lock, flags); | |
3815 | ||
3816 | return mask_updated; | |
3817 | } | |
3818 | ||
3819 | /** | |
3820 | * pci_check_and_mask_intx - mask INTx on pending interrupt | |
6e9292c5 | 3821 | * @dev: the PCI device to operate on |
a2e27787 JK |
3822 | * |
3823 | * Check if the device dev has its INTx line asserted, mask it and | |
3824 | * return true in that case. False is returned if not interrupt was | |
3825 | * pending. | |
3826 | */ | |
3827 | bool pci_check_and_mask_intx(struct pci_dev *dev) | |
3828 | { | |
3829 | return pci_check_and_set_intx_mask(dev, true); | |
3830 | } | |
3831 | EXPORT_SYMBOL_GPL(pci_check_and_mask_intx); | |
3832 | ||
3833 | /** | |
ebd50b93 | 3834 | * pci_check_and_unmask_intx - unmask INTx if no interrupt is pending |
6e9292c5 | 3835 | * @dev: the PCI device to operate on |
a2e27787 JK |
3836 | * |
3837 | * Check if the device dev has its INTx line asserted, unmask it if not | |
3838 | * and return true. False is returned and the mask remains active if | |
3839 | * there was still an interrupt pending. | |
3840 | */ | |
3841 | bool pci_check_and_unmask_intx(struct pci_dev *dev) | |
3842 | { | |
3843 | return pci_check_and_set_intx_mask(dev, false); | |
3844 | } | |
3845 | EXPORT_SYMBOL_GPL(pci_check_and_unmask_intx); | |
3846 | ||
3775a209 CL |
3847 | /** |
3848 | * pci_wait_for_pending_transaction - waits for pending transaction | |
3849 | * @dev: the PCI device to operate on | |
3850 | * | |
3851 | * Return 0 if transaction is pending 1 otherwise. | |
3852 | */ | |
3853 | int pci_wait_for_pending_transaction(struct pci_dev *dev) | |
8dd7f803 | 3854 | { |
157e876f AW |
3855 | if (!pci_is_pcie(dev)) |
3856 | return 1; | |
8c1c699f | 3857 | |
d0b4cc4e GS |
3858 | return pci_wait_for_pending(dev, pci_pcie_cap(dev) + PCI_EXP_DEVSTA, |
3859 | PCI_EXP_DEVSTA_TRPND); | |
3775a209 CL |
3860 | } |
3861 | EXPORT_SYMBOL(pci_wait_for_pending_transaction); | |
3862 | ||
5adecf81 AW |
3863 | /* |
3864 | * We should only need to wait 100ms after FLR, but some devices take longer. | |
3865 | * Wait for up to 1000ms for config space to return something other than -1. | |
3866 | * Intel IGD requires this when an LCD panel is attached. We read the 2nd | |
3867 | * dword because VFs don't implement the 1st dword. | |
3868 | */ | |
3869 | static void pci_flr_wait(struct pci_dev *dev) | |
3870 | { | |
3871 | int i = 0; | |
3872 | u32 id; | |
3873 | ||
3874 | do { | |
3875 | msleep(100); | |
3876 | pci_read_config_dword(dev, PCI_COMMAND, &id); | |
3877 | } while (i++ < 10 && id == ~0); | |
3878 | ||
3879 | if (id == ~0) | |
3880 | dev_warn(&dev->dev, "Failed to return from FLR\n"); | |
3881 | else if (i > 1) | |
3882 | dev_info(&dev->dev, "Required additional %dms to return from FLR\n", | |
3883 | (i - 1) * 100); | |
3884 | } | |
3885 | ||
a60a2b73 CH |
3886 | /** |
3887 | * pcie_has_flr - check if a device supports function level resets | |
3888 | * @dev: device to check | |
3889 | * | |
3890 | * Returns true if the device advertises support for PCIe function level | |
3891 | * resets. | |
3892 | */ | |
3893 | static bool pcie_has_flr(struct pci_dev *dev) | |
3775a209 CL |
3894 | { |
3895 | u32 cap; | |
3896 | ||
f65fd1aa | 3897 | if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET) |
a60a2b73 | 3898 | return false; |
3775a209 | 3899 | |
a60a2b73 CH |
3900 | pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap); |
3901 | return cap & PCI_EXP_DEVCAP_FLR; | |
3902 | } | |
3775a209 | 3903 | |
a60a2b73 CH |
3904 | /** |
3905 | * pcie_flr - initiate a PCIe function level reset | |
3906 | * @dev: device to reset | |
3907 | * | |
3908 | * Initiate a function level reset on @dev. The caller should ensure the | |
3909 | * device supports FLR before calling this function, e.g. by using the | |
3910 | * pcie_has_flr() helper. | |
3911 | */ | |
3912 | void pcie_flr(struct pci_dev *dev) | |
3913 | { | |
3775a209 | 3914 | if (!pci_wait_for_pending_transaction(dev)) |
bb383e28 | 3915 | dev_err(&dev->dev, "timed out waiting for pending transaction; performing function level reset anyway\n"); |
8c1c699f | 3916 | |
59875ae4 | 3917 | pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_BCR_FLR); |
5adecf81 | 3918 | pci_flr_wait(dev); |
8dd7f803 | 3919 | } |
a60a2b73 | 3920 | EXPORT_SYMBOL_GPL(pcie_flr); |
d91cdc74 | 3921 | |
8c1c699f | 3922 | static int pci_af_flr(struct pci_dev *dev, int probe) |
1ca88797 | 3923 | { |
8c1c699f | 3924 | int pos; |
1ca88797 SY |
3925 | u8 cap; |
3926 | ||
8c1c699f YZ |
3927 | pos = pci_find_capability(dev, PCI_CAP_ID_AF); |
3928 | if (!pos) | |
1ca88797 | 3929 | return -ENOTTY; |
8c1c699f | 3930 | |
f65fd1aa SN |
3931 | if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET) |
3932 | return -ENOTTY; | |
3933 | ||
8c1c699f | 3934 | pci_read_config_byte(dev, pos + PCI_AF_CAP, &cap); |
1ca88797 SY |
3935 | if (!(cap & PCI_AF_CAP_TP) || !(cap & PCI_AF_CAP_FLR)) |
3936 | return -ENOTTY; | |
3937 | ||
3938 | if (probe) | |
3939 | return 0; | |
3940 | ||
d066c946 AW |
3941 | /* |
3942 | * Wait for Transaction Pending bit to clear. A word-aligned test | |
3943 | * is used, so we use the conrol offset rather than status and shift | |
3944 | * the test bit to match. | |
3945 | */ | |
bb383e28 | 3946 | if (!pci_wait_for_pending(dev, pos + PCI_AF_CTRL, |
d066c946 | 3947 | PCI_AF_STATUS_TP << 8)) |
bb383e28 | 3948 | dev_err(&dev->dev, "timed out waiting for pending transaction; performing AF function level reset anyway\n"); |
5fe5db05 | 3949 | |
8c1c699f | 3950 | pci_write_config_byte(dev, pos + PCI_AF_CTRL, PCI_AF_CTRL_FLR); |
5adecf81 | 3951 | pci_flr_wait(dev); |
1ca88797 SY |
3952 | return 0; |
3953 | } | |
3954 | ||
83d74e03 RW |
3955 | /** |
3956 | * pci_pm_reset - Put device into PCI_D3 and back into PCI_D0. | |
3957 | * @dev: Device to reset. | |
3958 | * @probe: If set, only check if the device can be reset this way. | |
3959 | * | |
3960 | * If @dev supports native PCI PM and its PCI_PM_CTRL_NO_SOFT_RESET flag is | |
3961 | * unset, it will be reinitialized internally when going from PCI_D3hot to | |
3962 | * PCI_D0. If that's the case and the device is not in a low-power state | |
3963 | * already, force it into PCI_D3hot and back to PCI_D0, causing it to be reset. | |
3964 | * | |
3965 | * NOTE: This causes the caller to sleep for twice the device power transition | |
3966 | * cooldown period, which for the D0->D3hot and D3hot->D0 transitions is 10 ms | |
f7625980 | 3967 | * by default (i.e. unless the @dev's d3_delay field has a different value). |
83d74e03 RW |
3968 | * Moreover, only devices in D0 can be reset by this function. |
3969 | */ | |
f85876ba | 3970 | static int pci_pm_reset(struct pci_dev *dev, int probe) |
d91cdc74 | 3971 | { |
f85876ba YZ |
3972 | u16 csr; |
3973 | ||
51e53738 | 3974 | if (!dev->pm_cap || dev->dev_flags & PCI_DEV_FLAGS_NO_PM_RESET) |
f85876ba | 3975 | return -ENOTTY; |
d91cdc74 | 3976 | |
f85876ba YZ |
3977 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &csr); |
3978 | if (csr & PCI_PM_CTRL_NO_SOFT_RESET) | |
3979 | return -ENOTTY; | |
d91cdc74 | 3980 | |
f85876ba YZ |
3981 | if (probe) |
3982 | return 0; | |
1ca88797 | 3983 | |
f85876ba YZ |
3984 | if (dev->current_state != PCI_D0) |
3985 | return -EINVAL; | |
3986 | ||
3987 | csr &= ~PCI_PM_CTRL_STATE_MASK; | |
3988 | csr |= PCI_D3hot; | |
3989 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, csr); | |
1ae861e6 | 3990 | pci_dev_d3_sleep(dev); |
f85876ba YZ |
3991 | |
3992 | csr &= ~PCI_PM_CTRL_STATE_MASK; | |
3993 | csr |= PCI_D0; | |
3994 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, csr); | |
1ae861e6 | 3995 | pci_dev_d3_sleep(dev); |
f85876ba YZ |
3996 | |
3997 | return 0; | |
3998 | } | |
3999 | ||
9e33002f | 4000 | void pci_reset_secondary_bus(struct pci_dev *dev) |
c12ff1df YZ |
4001 | { |
4002 | u16 ctrl; | |
64e8674f AW |
4003 | |
4004 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &ctrl); | |
4005 | ctrl |= PCI_BRIDGE_CTL_BUS_RESET; | |
4006 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, ctrl); | |
de0c548c AW |
4007 | /* |
4008 | * PCI spec v3.0 7.6.4.2 requires minimum Trst of 1ms. Double | |
f7625980 | 4009 | * this to 2ms to ensure that we meet the minimum requirement. |
de0c548c AW |
4010 | */ |
4011 | msleep(2); | |
64e8674f AW |
4012 | |
4013 | ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET; | |
4014 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, ctrl); | |
de0c548c AW |
4015 | |
4016 | /* | |
4017 | * Trhfa for conventional PCI is 2^25 clock cycles. | |
4018 | * Assuming a minimum 33MHz clock this results in a 1s | |
4019 | * delay before we can consider subordinate devices to | |
4020 | * be re-initialized. PCIe has some ways to shorten this, | |
4021 | * but we don't make use of them yet. | |
4022 | */ | |
4023 | ssleep(1); | |
64e8674f | 4024 | } |
d92a208d | 4025 | |
9e33002f GS |
4026 | void __weak pcibios_reset_secondary_bus(struct pci_dev *dev) |
4027 | { | |
4028 | pci_reset_secondary_bus(dev); | |
4029 | } | |
4030 | ||
d92a208d GS |
4031 | /** |
4032 | * pci_reset_bridge_secondary_bus - Reset the secondary bus on a PCI bridge. | |
4033 | * @dev: Bridge device | |
4034 | * | |
4035 | * Use the bridge control register to assert reset on the secondary bus. | |
4036 | * Devices on the secondary bus are left in power-on state. | |
4037 | */ | |
4038 | void pci_reset_bridge_secondary_bus(struct pci_dev *dev) | |
4039 | { | |
4040 | pcibios_reset_secondary_bus(dev); | |
4041 | } | |
64e8674f AW |
4042 | EXPORT_SYMBOL_GPL(pci_reset_bridge_secondary_bus); |
4043 | ||
4044 | static int pci_parent_bus_reset(struct pci_dev *dev, int probe) | |
4045 | { | |
c12ff1df YZ |
4046 | struct pci_dev *pdev; |
4047 | ||
f331a859 AW |
4048 | if (pci_is_root_bus(dev->bus) || dev->subordinate || |
4049 | !dev->bus->self || dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET) | |
c12ff1df YZ |
4050 | return -ENOTTY; |
4051 | ||
4052 | list_for_each_entry(pdev, &dev->bus->devices, bus_list) | |
4053 | if (pdev != dev) | |
4054 | return -ENOTTY; | |
4055 | ||
4056 | if (probe) | |
4057 | return 0; | |
4058 | ||
64e8674f | 4059 | pci_reset_bridge_secondary_bus(dev->bus->self); |
c12ff1df YZ |
4060 | |
4061 | return 0; | |
4062 | } | |
4063 | ||
608c3881 AW |
4064 | static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, int probe) |
4065 | { | |
4066 | int rc = -ENOTTY; | |
4067 | ||
4068 | if (!hotplug || !try_module_get(hotplug->ops->owner)) | |
4069 | return rc; | |
4070 | ||
4071 | if (hotplug->ops->reset_slot) | |
4072 | rc = hotplug->ops->reset_slot(hotplug, probe); | |
4073 | ||
4074 | module_put(hotplug->ops->owner); | |
4075 | ||
4076 | return rc; | |
4077 | } | |
4078 | ||
4079 | static int pci_dev_reset_slot_function(struct pci_dev *dev, int probe) | |
4080 | { | |
4081 | struct pci_dev *pdev; | |
4082 | ||
f331a859 AW |
4083 | if (dev->subordinate || !dev->slot || |
4084 | dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET) | |
608c3881 AW |
4085 | return -ENOTTY; |
4086 | ||
4087 | list_for_each_entry(pdev, &dev->bus->devices, bus_list) | |
4088 | if (pdev != dev && pdev->slot == dev->slot) | |
4089 | return -ENOTTY; | |
4090 | ||
4091 | return pci_reset_hotplug_slot(dev->slot->hotplug, probe); | |
4092 | } | |
4093 | ||
977f857c | 4094 | static int __pci_dev_reset(struct pci_dev *dev, int probe) |
d91cdc74 | 4095 | { |
8c1c699f YZ |
4096 | int rc; |
4097 | ||
4098 | might_sleep(); | |
4099 | ||
b9c3b266 DC |
4100 | rc = pci_dev_specific_reset(dev, probe); |
4101 | if (rc != -ENOTTY) | |
4102 | goto done; | |
4103 | ||
a60a2b73 CH |
4104 | if (pcie_has_flr(dev)) { |
4105 | if (!probe) | |
4106 | pcie_flr(dev); | |
4107 | rc = 0; | |
8c1c699f | 4108 | goto done; |
a60a2b73 | 4109 | } |
d91cdc74 | 4110 | |
8c1c699f | 4111 | rc = pci_af_flr(dev, probe); |
f85876ba YZ |
4112 | if (rc != -ENOTTY) |
4113 | goto done; | |
4114 | ||
4115 | rc = pci_pm_reset(dev, probe); | |
c12ff1df YZ |
4116 | if (rc != -ENOTTY) |
4117 | goto done; | |
4118 | ||
608c3881 AW |
4119 | rc = pci_dev_reset_slot_function(dev, probe); |
4120 | if (rc != -ENOTTY) | |
4121 | goto done; | |
4122 | ||
c12ff1df | 4123 | rc = pci_parent_bus_reset(dev, probe); |
8c1c699f | 4124 | done: |
977f857c KRW |
4125 | return rc; |
4126 | } | |
4127 | ||
77cb985a AW |
4128 | static void pci_dev_lock(struct pci_dev *dev) |
4129 | { | |
4130 | pci_cfg_access_lock(dev); | |
4131 | /* block PM suspend, driver probe, etc. */ | |
4132 | device_lock(&dev->dev); | |
4133 | } | |
4134 | ||
61cf16d8 AW |
4135 | /* Return 1 on successful lock, 0 on contention */ |
4136 | static int pci_dev_trylock(struct pci_dev *dev) | |
4137 | { | |
4138 | if (pci_cfg_access_trylock(dev)) { | |
4139 | if (device_trylock(&dev->dev)) | |
4140 | return 1; | |
4141 | pci_cfg_access_unlock(dev); | |
4142 | } | |
4143 | ||
4144 | return 0; | |
4145 | } | |
4146 | ||
77cb985a AW |
4147 | static void pci_dev_unlock(struct pci_dev *dev) |
4148 | { | |
4149 | device_unlock(&dev->dev); | |
4150 | pci_cfg_access_unlock(dev); | |
4151 | } | |
4152 | ||
3ebe7f9f KB |
4153 | /** |
4154 | * pci_reset_notify - notify device driver of reset | |
4155 | * @dev: device to be notified of reset | |
4156 | * @prepare: 'true' if device is about to be reset; 'false' if reset attempt | |
4157 | * completed | |
4158 | * | |
4159 | * Must be called prior to device access being disabled and after device | |
4160 | * access is restored. | |
4161 | */ | |
4162 | static void pci_reset_notify(struct pci_dev *dev, bool prepare) | |
4163 | { | |
4164 | const struct pci_error_handlers *err_handler = | |
4165 | dev->driver ? dev->driver->err_handler : NULL; | |
4166 | if (err_handler && err_handler->reset_notify) | |
4167 | err_handler->reset_notify(dev, prepare); | |
4168 | } | |
4169 | ||
77cb985a AW |
4170 | static void pci_dev_save_and_disable(struct pci_dev *dev) |
4171 | { | |
3ebe7f9f KB |
4172 | pci_reset_notify(dev, true); |
4173 | ||
a6cbaade AW |
4174 | /* |
4175 | * Wake-up device prior to save. PM registers default to D0 after | |
4176 | * reset and a simple register restore doesn't reliably return | |
4177 | * to a non-D0 state anyway. | |
4178 | */ | |
4179 | pci_set_power_state(dev, PCI_D0); | |
4180 | ||
77cb985a AW |
4181 | pci_save_state(dev); |
4182 | /* | |
4183 | * Disable the device by clearing the Command register, except for | |
4184 | * INTx-disable which is set. This not only disables MMIO and I/O port | |
4185 | * BARs, but also prevents the device from being Bus Master, preventing | |
4186 | * DMA from the device including MSI/MSI-X interrupts. For PCI 2.3 | |
4187 | * compliant devices, INTx-disable prevents legacy interrupts. | |
4188 | */ | |
4189 | pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE); | |
4190 | } | |
4191 | ||
4192 | static void pci_dev_restore(struct pci_dev *dev) | |
4193 | { | |
4194 | pci_restore_state(dev); | |
3ebe7f9f | 4195 | pci_reset_notify(dev, false); |
77cb985a AW |
4196 | } |
4197 | ||
977f857c KRW |
4198 | static int pci_dev_reset(struct pci_dev *dev, int probe) |
4199 | { | |
4200 | int rc; | |
4201 | ||
77cb985a AW |
4202 | if (!probe) |
4203 | pci_dev_lock(dev); | |
977f857c KRW |
4204 | |
4205 | rc = __pci_dev_reset(dev, probe); | |
4206 | ||
77cb985a AW |
4207 | if (!probe) |
4208 | pci_dev_unlock(dev); | |
4209 | ||
8c1c699f | 4210 | return rc; |
d91cdc74 | 4211 | } |
3ebe7f9f | 4212 | |
d91cdc74 | 4213 | /** |
8c1c699f YZ |
4214 | * __pci_reset_function - reset a PCI device function |
4215 | * @dev: PCI device to reset | |
d91cdc74 SY |
4216 | * |
4217 | * Some devices allow an individual function to be reset without affecting | |
4218 | * other functions in the same device. The PCI device must be responsive | |
4219 | * to PCI config space in order to use this function. | |
4220 | * | |
4221 | * The device function is presumed to be unused when this function is called. | |
4222 | * Resetting the device will make the contents of PCI configuration space | |
4223 | * random, so any caller of this must be prepared to reinitialise the | |
4224 | * device including MSI, bus mastering, BARs, decoding IO and memory spaces, | |
4225 | * etc. | |
4226 | * | |
8c1c699f | 4227 | * Returns 0 if the device function was successfully reset or negative if the |
d91cdc74 SY |
4228 | * device doesn't support resetting a single function. |
4229 | */ | |
8c1c699f | 4230 | int __pci_reset_function(struct pci_dev *dev) |
d91cdc74 | 4231 | { |
8c1c699f | 4232 | return pci_dev_reset(dev, 0); |
d91cdc74 | 4233 | } |
8c1c699f | 4234 | EXPORT_SYMBOL_GPL(__pci_reset_function); |
8dd7f803 | 4235 | |
6fbf9e7a KRW |
4236 | /** |
4237 | * __pci_reset_function_locked - reset a PCI device function while holding | |
4238 | * the @dev mutex lock. | |
4239 | * @dev: PCI device to reset | |
4240 | * | |
4241 | * Some devices allow an individual function to be reset without affecting | |
4242 | * other functions in the same device. The PCI device must be responsive | |
4243 | * to PCI config space in order to use this function. | |
4244 | * | |
4245 | * The device function is presumed to be unused and the caller is holding | |
4246 | * the device mutex lock when this function is called. | |
4247 | * Resetting the device will make the contents of PCI configuration space | |
4248 | * random, so any caller of this must be prepared to reinitialise the | |
4249 | * device including MSI, bus mastering, BARs, decoding IO and memory spaces, | |
4250 | * etc. | |
4251 | * | |
4252 | * Returns 0 if the device function was successfully reset or negative if the | |
4253 | * device doesn't support resetting a single function. | |
4254 | */ | |
4255 | int __pci_reset_function_locked(struct pci_dev *dev) | |
4256 | { | |
977f857c | 4257 | return __pci_dev_reset(dev, 0); |
6fbf9e7a KRW |
4258 | } |
4259 | EXPORT_SYMBOL_GPL(__pci_reset_function_locked); | |
4260 | ||
711d5779 MT |
4261 | /** |
4262 | * pci_probe_reset_function - check whether the device can be safely reset | |
4263 | * @dev: PCI device to reset | |
4264 | * | |
4265 | * Some devices allow an individual function to be reset without affecting | |
4266 | * other functions in the same device. The PCI device must be responsive | |
4267 | * to PCI config space in order to use this function. | |
4268 | * | |
4269 | * Returns 0 if the device function can be reset or negative if the | |
4270 | * device doesn't support resetting a single function. | |
4271 | */ | |
4272 | int pci_probe_reset_function(struct pci_dev *dev) | |
4273 | { | |
4274 | return pci_dev_reset(dev, 1); | |
4275 | } | |
4276 | ||
8dd7f803 | 4277 | /** |
8c1c699f YZ |
4278 | * pci_reset_function - quiesce and reset a PCI device function |
4279 | * @dev: PCI device to reset | |
8dd7f803 SY |
4280 | * |
4281 | * Some devices allow an individual function to be reset without affecting | |
4282 | * other functions in the same device. The PCI device must be responsive | |
4283 | * to PCI config space in order to use this function. | |
4284 | * | |
4285 | * This function does not just reset the PCI portion of a device, but | |
4286 | * clears all the state associated with the device. This function differs | |
8c1c699f | 4287 | * from __pci_reset_function in that it saves and restores device state |
8dd7f803 SY |
4288 | * over the reset. |
4289 | * | |
8c1c699f | 4290 | * Returns 0 if the device function was successfully reset or negative if the |
8dd7f803 SY |
4291 | * device doesn't support resetting a single function. |
4292 | */ | |
4293 | int pci_reset_function(struct pci_dev *dev) | |
4294 | { | |
8c1c699f | 4295 | int rc; |
8dd7f803 | 4296 | |
8c1c699f YZ |
4297 | rc = pci_dev_reset(dev, 1); |
4298 | if (rc) | |
4299 | return rc; | |
8dd7f803 | 4300 | |
77cb985a | 4301 | pci_dev_save_and_disable(dev); |
8dd7f803 | 4302 | |
8c1c699f | 4303 | rc = pci_dev_reset(dev, 0); |
8dd7f803 | 4304 | |
77cb985a | 4305 | pci_dev_restore(dev); |
8dd7f803 | 4306 | |
8c1c699f | 4307 | return rc; |
8dd7f803 SY |
4308 | } |
4309 | EXPORT_SYMBOL_GPL(pci_reset_function); | |
4310 | ||
61cf16d8 AW |
4311 | /** |
4312 | * pci_try_reset_function - quiesce and reset a PCI device function | |
4313 | * @dev: PCI device to reset | |
4314 | * | |
4315 | * Same as above, except return -EAGAIN if unable to lock device. | |
4316 | */ | |
4317 | int pci_try_reset_function(struct pci_dev *dev) | |
4318 | { | |
4319 | int rc; | |
4320 | ||
4321 | rc = pci_dev_reset(dev, 1); | |
4322 | if (rc) | |
4323 | return rc; | |
4324 | ||
4325 | pci_dev_save_and_disable(dev); | |
4326 | ||
4327 | if (pci_dev_trylock(dev)) { | |
4328 | rc = __pci_dev_reset(dev, 0); | |
4329 | pci_dev_unlock(dev); | |
4330 | } else | |
4331 | rc = -EAGAIN; | |
4332 | ||
4333 | pci_dev_restore(dev); | |
4334 | ||
4335 | return rc; | |
4336 | } | |
4337 | EXPORT_SYMBOL_GPL(pci_try_reset_function); | |
4338 | ||
f331a859 AW |
4339 | /* Do any devices on or below this bus prevent a bus reset? */ |
4340 | static bool pci_bus_resetable(struct pci_bus *bus) | |
4341 | { | |
4342 | struct pci_dev *dev; | |
4343 | ||
4344 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
4345 | if (dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET || | |
4346 | (dev->subordinate && !pci_bus_resetable(dev->subordinate))) | |
4347 | return false; | |
4348 | } | |
4349 | ||
4350 | return true; | |
4351 | } | |
4352 | ||
090a3c53 AW |
4353 | /* Lock devices from the top of the tree down */ |
4354 | static void pci_bus_lock(struct pci_bus *bus) | |
4355 | { | |
4356 | struct pci_dev *dev; | |
4357 | ||
4358 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
4359 | pci_dev_lock(dev); | |
4360 | if (dev->subordinate) | |
4361 | pci_bus_lock(dev->subordinate); | |
4362 | } | |
4363 | } | |
4364 | ||
4365 | /* Unlock devices from the bottom of the tree up */ | |
4366 | static void pci_bus_unlock(struct pci_bus *bus) | |
4367 | { | |
4368 | struct pci_dev *dev; | |
4369 | ||
4370 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
4371 | if (dev->subordinate) | |
4372 | pci_bus_unlock(dev->subordinate); | |
4373 | pci_dev_unlock(dev); | |
4374 | } | |
4375 | } | |
4376 | ||
61cf16d8 AW |
4377 | /* Return 1 on successful lock, 0 on contention */ |
4378 | static int pci_bus_trylock(struct pci_bus *bus) | |
4379 | { | |
4380 | struct pci_dev *dev; | |
4381 | ||
4382 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
4383 | if (!pci_dev_trylock(dev)) | |
4384 | goto unlock; | |
4385 | if (dev->subordinate) { | |
4386 | if (!pci_bus_trylock(dev->subordinate)) { | |
4387 | pci_dev_unlock(dev); | |
4388 | goto unlock; | |
4389 | } | |
4390 | } | |
4391 | } | |
4392 | return 1; | |
4393 | ||
4394 | unlock: | |
4395 | list_for_each_entry_continue_reverse(dev, &bus->devices, bus_list) { | |
4396 | if (dev->subordinate) | |
4397 | pci_bus_unlock(dev->subordinate); | |
4398 | pci_dev_unlock(dev); | |
4399 | } | |
4400 | return 0; | |
4401 | } | |
4402 | ||
f331a859 AW |
4403 | /* Do any devices on or below this slot prevent a bus reset? */ |
4404 | static bool pci_slot_resetable(struct pci_slot *slot) | |
4405 | { | |
4406 | struct pci_dev *dev; | |
4407 | ||
4408 | list_for_each_entry(dev, &slot->bus->devices, bus_list) { | |
4409 | if (!dev->slot || dev->slot != slot) | |
4410 | continue; | |
4411 | if (dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET || | |
4412 | (dev->subordinate && !pci_bus_resetable(dev->subordinate))) | |
4413 | return false; | |
4414 | } | |
4415 | ||
4416 | return true; | |
4417 | } | |
4418 | ||
090a3c53 AW |
4419 | /* Lock devices from the top of the tree down */ |
4420 | static void pci_slot_lock(struct pci_slot *slot) | |
4421 | { | |
4422 | struct pci_dev *dev; | |
4423 | ||
4424 | list_for_each_entry(dev, &slot->bus->devices, bus_list) { | |
4425 | if (!dev->slot || dev->slot != slot) | |
4426 | continue; | |
4427 | pci_dev_lock(dev); | |
4428 | if (dev->subordinate) | |
4429 | pci_bus_lock(dev->subordinate); | |
4430 | } | |
4431 | } | |
4432 | ||
4433 | /* Unlock devices from the bottom of the tree up */ | |
4434 | static void pci_slot_unlock(struct pci_slot *slot) | |
4435 | { | |
4436 | struct pci_dev *dev; | |
4437 | ||
4438 | list_for_each_entry(dev, &slot->bus->devices, bus_list) { | |
4439 | if (!dev->slot || dev->slot != slot) | |
4440 | continue; | |
4441 | if (dev->subordinate) | |
4442 | pci_bus_unlock(dev->subordinate); | |
4443 | pci_dev_unlock(dev); | |
4444 | } | |
4445 | } | |
4446 | ||
61cf16d8 AW |
4447 | /* Return 1 on successful lock, 0 on contention */ |
4448 | static int pci_slot_trylock(struct pci_slot *slot) | |
4449 | { | |
4450 | struct pci_dev *dev; | |
4451 | ||
4452 | list_for_each_entry(dev, &slot->bus->devices, bus_list) { | |
4453 | if (!dev->slot || dev->slot != slot) | |
4454 | continue; | |
4455 | if (!pci_dev_trylock(dev)) | |
4456 | goto unlock; | |
4457 | if (dev->subordinate) { | |
4458 | if (!pci_bus_trylock(dev->subordinate)) { | |
4459 | pci_dev_unlock(dev); | |
4460 | goto unlock; | |
4461 | } | |
4462 | } | |
4463 | } | |
4464 | return 1; | |
4465 | ||
4466 | unlock: | |
4467 | list_for_each_entry_continue_reverse(dev, | |
4468 | &slot->bus->devices, bus_list) { | |
4469 | if (!dev->slot || dev->slot != slot) | |
4470 | continue; | |
4471 | if (dev->subordinate) | |
4472 | pci_bus_unlock(dev->subordinate); | |
4473 | pci_dev_unlock(dev); | |
4474 | } | |
4475 | return 0; | |
4476 | } | |
4477 | ||
090a3c53 AW |
4478 | /* Save and disable devices from the top of the tree down */ |
4479 | static void pci_bus_save_and_disable(struct pci_bus *bus) | |
4480 | { | |
4481 | struct pci_dev *dev; | |
4482 | ||
4483 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
4484 | pci_dev_save_and_disable(dev); | |
4485 | if (dev->subordinate) | |
4486 | pci_bus_save_and_disable(dev->subordinate); | |
4487 | } | |
4488 | } | |
4489 | ||
4490 | /* | |
4491 | * Restore devices from top of the tree down - parent bridges need to be | |
4492 | * restored before we can get to subordinate devices. | |
4493 | */ | |
4494 | static void pci_bus_restore(struct pci_bus *bus) | |
4495 | { | |
4496 | struct pci_dev *dev; | |
4497 | ||
4498 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
4499 | pci_dev_restore(dev); | |
4500 | if (dev->subordinate) | |
4501 | pci_bus_restore(dev->subordinate); | |
4502 | } | |
4503 | } | |
4504 | ||
4505 | /* Save and disable devices from the top of the tree down */ | |
4506 | static void pci_slot_save_and_disable(struct pci_slot *slot) | |
4507 | { | |
4508 | struct pci_dev *dev; | |
4509 | ||
4510 | list_for_each_entry(dev, &slot->bus->devices, bus_list) { | |
4511 | if (!dev->slot || dev->slot != slot) | |
4512 | continue; | |
4513 | pci_dev_save_and_disable(dev); | |
4514 | if (dev->subordinate) | |
4515 | pci_bus_save_and_disable(dev->subordinate); | |
4516 | } | |
4517 | } | |
4518 | ||
4519 | /* | |
4520 | * Restore devices from top of the tree down - parent bridges need to be | |
4521 | * restored before we can get to subordinate devices. | |
4522 | */ | |
4523 | static void pci_slot_restore(struct pci_slot *slot) | |
4524 | { | |
4525 | struct pci_dev *dev; | |
4526 | ||
4527 | list_for_each_entry(dev, &slot->bus->devices, bus_list) { | |
4528 | if (!dev->slot || dev->slot != slot) | |
4529 | continue; | |
4530 | pci_dev_restore(dev); | |
4531 | if (dev->subordinate) | |
4532 | pci_bus_restore(dev->subordinate); | |
4533 | } | |
4534 | } | |
4535 | ||
4536 | static int pci_slot_reset(struct pci_slot *slot, int probe) | |
4537 | { | |
4538 | int rc; | |
4539 | ||
f331a859 | 4540 | if (!slot || !pci_slot_resetable(slot)) |
090a3c53 AW |
4541 | return -ENOTTY; |
4542 | ||
4543 | if (!probe) | |
4544 | pci_slot_lock(slot); | |
4545 | ||
4546 | might_sleep(); | |
4547 | ||
4548 | rc = pci_reset_hotplug_slot(slot->hotplug, probe); | |
4549 | ||
4550 | if (!probe) | |
4551 | pci_slot_unlock(slot); | |
4552 | ||
4553 | return rc; | |
4554 | } | |
4555 | ||
9a3d2b9b AW |
4556 | /** |
4557 | * pci_probe_reset_slot - probe whether a PCI slot can be reset | |
4558 | * @slot: PCI slot to probe | |
4559 | * | |
4560 | * Return 0 if slot can be reset, negative if a slot reset is not supported. | |
4561 | */ | |
4562 | int pci_probe_reset_slot(struct pci_slot *slot) | |
4563 | { | |
4564 | return pci_slot_reset(slot, 1); | |
4565 | } | |
4566 | EXPORT_SYMBOL_GPL(pci_probe_reset_slot); | |
4567 | ||
090a3c53 AW |
4568 | /** |
4569 | * pci_reset_slot - reset a PCI slot | |
4570 | * @slot: PCI slot to reset | |
4571 | * | |
4572 | * A PCI bus may host multiple slots, each slot may support a reset mechanism | |
4573 | * independent of other slots. For instance, some slots may support slot power | |
4574 | * control. In the case of a 1:1 bus to slot architecture, this function may | |
4575 | * wrap the bus reset to avoid spurious slot related events such as hotplug. | |
4576 | * Generally a slot reset should be attempted before a bus reset. All of the | |
4577 | * function of the slot and any subordinate buses behind the slot are reset | |
4578 | * through this function. PCI config space of all devices in the slot and | |
4579 | * behind the slot is saved before and restored after reset. | |
4580 | * | |
4581 | * Return 0 on success, non-zero on error. | |
4582 | */ | |
4583 | int pci_reset_slot(struct pci_slot *slot) | |
4584 | { | |
4585 | int rc; | |
4586 | ||
4587 | rc = pci_slot_reset(slot, 1); | |
4588 | if (rc) | |
4589 | return rc; | |
4590 | ||
4591 | pci_slot_save_and_disable(slot); | |
4592 | ||
4593 | rc = pci_slot_reset(slot, 0); | |
4594 | ||
4595 | pci_slot_restore(slot); | |
4596 | ||
4597 | return rc; | |
4598 | } | |
4599 | EXPORT_SYMBOL_GPL(pci_reset_slot); | |
4600 | ||
61cf16d8 AW |
4601 | /** |
4602 | * pci_try_reset_slot - Try to reset a PCI slot | |
4603 | * @slot: PCI slot to reset | |
4604 | * | |
4605 | * Same as above except return -EAGAIN if the slot cannot be locked | |
4606 | */ | |
4607 | int pci_try_reset_slot(struct pci_slot *slot) | |
4608 | { | |
4609 | int rc; | |
4610 | ||
4611 | rc = pci_slot_reset(slot, 1); | |
4612 | if (rc) | |
4613 | return rc; | |
4614 | ||
4615 | pci_slot_save_and_disable(slot); | |
4616 | ||
4617 | if (pci_slot_trylock(slot)) { | |
4618 | might_sleep(); | |
4619 | rc = pci_reset_hotplug_slot(slot->hotplug, 0); | |
4620 | pci_slot_unlock(slot); | |
4621 | } else | |
4622 | rc = -EAGAIN; | |
4623 | ||
4624 | pci_slot_restore(slot); | |
4625 | ||
4626 | return rc; | |
4627 | } | |
4628 | EXPORT_SYMBOL_GPL(pci_try_reset_slot); | |
4629 | ||
090a3c53 AW |
4630 | static int pci_bus_reset(struct pci_bus *bus, int probe) |
4631 | { | |
f331a859 | 4632 | if (!bus->self || !pci_bus_resetable(bus)) |
090a3c53 AW |
4633 | return -ENOTTY; |
4634 | ||
4635 | if (probe) | |
4636 | return 0; | |
4637 | ||
4638 | pci_bus_lock(bus); | |
4639 | ||
4640 | might_sleep(); | |
4641 | ||
4642 | pci_reset_bridge_secondary_bus(bus->self); | |
4643 | ||
4644 | pci_bus_unlock(bus); | |
4645 | ||
4646 | return 0; | |
4647 | } | |
4648 | ||
9a3d2b9b AW |
4649 | /** |
4650 | * pci_probe_reset_bus - probe whether a PCI bus can be reset | |
4651 | * @bus: PCI bus to probe | |
4652 | * | |
4653 | * Return 0 if bus can be reset, negative if a bus reset is not supported. | |
4654 | */ | |
4655 | int pci_probe_reset_bus(struct pci_bus *bus) | |
4656 | { | |
4657 | return pci_bus_reset(bus, 1); | |
4658 | } | |
4659 | EXPORT_SYMBOL_GPL(pci_probe_reset_bus); | |
4660 | ||
090a3c53 AW |
4661 | /** |
4662 | * pci_reset_bus - reset a PCI bus | |
4663 | * @bus: top level PCI bus to reset | |
4664 | * | |
4665 | * Do a bus reset on the given bus and any subordinate buses, saving | |
4666 | * and restoring state of all devices. | |
4667 | * | |
4668 | * Return 0 on success, non-zero on error. | |
4669 | */ | |
4670 | int pci_reset_bus(struct pci_bus *bus) | |
4671 | { | |
4672 | int rc; | |
4673 | ||
4674 | rc = pci_bus_reset(bus, 1); | |
4675 | if (rc) | |
4676 | return rc; | |
4677 | ||
4678 | pci_bus_save_and_disable(bus); | |
4679 | ||
4680 | rc = pci_bus_reset(bus, 0); | |
4681 | ||
4682 | pci_bus_restore(bus); | |
4683 | ||
4684 | return rc; | |
4685 | } | |
4686 | EXPORT_SYMBOL_GPL(pci_reset_bus); | |
4687 | ||
61cf16d8 AW |
4688 | /** |
4689 | * pci_try_reset_bus - Try to reset a PCI bus | |
4690 | * @bus: top level PCI bus to reset | |
4691 | * | |
4692 | * Same as above except return -EAGAIN if the bus cannot be locked | |
4693 | */ | |
4694 | int pci_try_reset_bus(struct pci_bus *bus) | |
4695 | { | |
4696 | int rc; | |
4697 | ||
4698 | rc = pci_bus_reset(bus, 1); | |
4699 | if (rc) | |
4700 | return rc; | |
4701 | ||
4702 | pci_bus_save_and_disable(bus); | |
4703 | ||
4704 | if (pci_bus_trylock(bus)) { | |
4705 | might_sleep(); | |
4706 | pci_reset_bridge_secondary_bus(bus->self); | |
4707 | pci_bus_unlock(bus); | |
4708 | } else | |
4709 | rc = -EAGAIN; | |
4710 | ||
4711 | pci_bus_restore(bus); | |
4712 | ||
4713 | return rc; | |
4714 | } | |
4715 | EXPORT_SYMBOL_GPL(pci_try_reset_bus); | |
4716 | ||
d556ad4b PO |
4717 | /** |
4718 | * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count | |
4719 | * @dev: PCI device to query | |
4720 | * | |
4721 | * Returns mmrbc: maximum designed memory read count in bytes | |
4722 | * or appropriate error value. | |
4723 | */ | |
4724 | int pcix_get_max_mmrbc(struct pci_dev *dev) | |
4725 | { | |
7c9e2b1c | 4726 | int cap; |
d556ad4b PO |
4727 | u32 stat; |
4728 | ||
4729 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
4730 | if (!cap) | |
4731 | return -EINVAL; | |
4732 | ||
7c9e2b1c | 4733 | if (pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat)) |
d556ad4b PO |
4734 | return -EINVAL; |
4735 | ||
25daeb55 | 4736 | return 512 << ((stat & PCI_X_STATUS_MAX_READ) >> 21); |
d556ad4b PO |
4737 | } |
4738 | EXPORT_SYMBOL(pcix_get_max_mmrbc); | |
4739 | ||
4740 | /** | |
4741 | * pcix_get_mmrbc - get PCI-X maximum memory read byte count | |
4742 | * @dev: PCI device to query | |
4743 | * | |
4744 | * Returns mmrbc: maximum memory read count in bytes | |
4745 | * or appropriate error value. | |
4746 | */ | |
4747 | int pcix_get_mmrbc(struct pci_dev *dev) | |
4748 | { | |
7c9e2b1c | 4749 | int cap; |
bdc2bda7 | 4750 | u16 cmd; |
d556ad4b PO |
4751 | |
4752 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
4753 | if (!cap) | |
4754 | return -EINVAL; | |
4755 | ||
7c9e2b1c DN |
4756 | if (pci_read_config_word(dev, cap + PCI_X_CMD, &cmd)) |
4757 | return -EINVAL; | |
d556ad4b | 4758 | |
7c9e2b1c | 4759 | return 512 << ((cmd & PCI_X_CMD_MAX_READ) >> 2); |
d556ad4b PO |
4760 | } |
4761 | EXPORT_SYMBOL(pcix_get_mmrbc); | |
4762 | ||
4763 | /** | |
4764 | * pcix_set_mmrbc - set PCI-X maximum memory read byte count | |
4765 | * @dev: PCI device to query | |
4766 | * @mmrbc: maximum memory read count in bytes | |
4767 | * valid values are 512, 1024, 2048, 4096 | |
4768 | * | |
4769 | * If possible sets maximum memory read byte count, some bridges have erratas | |
4770 | * that prevent this. | |
4771 | */ | |
4772 | int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc) | |
4773 | { | |
7c9e2b1c | 4774 | int cap; |
bdc2bda7 DN |
4775 | u32 stat, v, o; |
4776 | u16 cmd; | |
d556ad4b | 4777 | |
229f5afd | 4778 | if (mmrbc < 512 || mmrbc > 4096 || !is_power_of_2(mmrbc)) |
7c9e2b1c | 4779 | return -EINVAL; |
d556ad4b PO |
4780 | |
4781 | v = ffs(mmrbc) - 10; | |
4782 | ||
4783 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
4784 | if (!cap) | |
7c9e2b1c | 4785 | return -EINVAL; |
d556ad4b | 4786 | |
7c9e2b1c DN |
4787 | if (pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat)) |
4788 | return -EINVAL; | |
d556ad4b PO |
4789 | |
4790 | if (v > (stat & PCI_X_STATUS_MAX_READ) >> 21) | |
4791 | return -E2BIG; | |
4792 | ||
7c9e2b1c DN |
4793 | if (pci_read_config_word(dev, cap + PCI_X_CMD, &cmd)) |
4794 | return -EINVAL; | |
d556ad4b PO |
4795 | |
4796 | o = (cmd & PCI_X_CMD_MAX_READ) >> 2; | |
4797 | if (o != v) { | |
809a3bf9 | 4798 | if (v > o && (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MMRBC)) |
d556ad4b PO |
4799 | return -EIO; |
4800 | ||
4801 | cmd &= ~PCI_X_CMD_MAX_READ; | |
4802 | cmd |= v << 2; | |
7c9e2b1c DN |
4803 | if (pci_write_config_word(dev, cap + PCI_X_CMD, cmd)) |
4804 | return -EIO; | |
d556ad4b | 4805 | } |
7c9e2b1c | 4806 | return 0; |
d556ad4b PO |
4807 | } |
4808 | EXPORT_SYMBOL(pcix_set_mmrbc); | |
4809 | ||
4810 | /** | |
4811 | * pcie_get_readrq - get PCI Express read request size | |
4812 | * @dev: PCI device to query | |
4813 | * | |
4814 | * Returns maximum memory read request in bytes | |
4815 | * or appropriate error value. | |
4816 | */ | |
4817 | int pcie_get_readrq(struct pci_dev *dev) | |
4818 | { | |
d556ad4b PO |
4819 | u16 ctl; |
4820 | ||
59875ae4 | 4821 | pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &ctl); |
d556ad4b | 4822 | |
59875ae4 | 4823 | return 128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12); |
d556ad4b PO |
4824 | } |
4825 | EXPORT_SYMBOL(pcie_get_readrq); | |
4826 | ||
4827 | /** | |
4828 | * pcie_set_readrq - set PCI Express maximum memory read request | |
4829 | * @dev: PCI device to query | |
42e61f4a | 4830 | * @rq: maximum memory read count in bytes |
d556ad4b PO |
4831 | * valid values are 128, 256, 512, 1024, 2048, 4096 |
4832 | * | |
c9b378c7 | 4833 | * If possible sets maximum memory read request in bytes |
d556ad4b PO |
4834 | */ |
4835 | int pcie_set_readrq(struct pci_dev *dev, int rq) | |
4836 | { | |
59875ae4 | 4837 | u16 v; |
d556ad4b | 4838 | |
229f5afd | 4839 | if (rq < 128 || rq > 4096 || !is_power_of_2(rq)) |
59875ae4 | 4840 | return -EINVAL; |
d556ad4b | 4841 | |
a1c473aa BH |
4842 | /* |
4843 | * If using the "performance" PCIe config, we clamp the | |
4844 | * read rq size to the max packet size to prevent the | |
4845 | * host bridge generating requests larger than we can | |
4846 | * cope with | |
4847 | */ | |
4848 | if (pcie_bus_config == PCIE_BUS_PERFORMANCE) { | |
4849 | int mps = pcie_get_mps(dev); | |
4850 | ||
a1c473aa BH |
4851 | if (mps < rq) |
4852 | rq = mps; | |
4853 | } | |
4854 | ||
4855 | v = (ffs(rq) - 8) << 12; | |
d556ad4b | 4856 | |
59875ae4 JL |
4857 | return pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL, |
4858 | PCI_EXP_DEVCTL_READRQ, v); | |
d556ad4b PO |
4859 | } |
4860 | EXPORT_SYMBOL(pcie_set_readrq); | |
4861 | ||
b03e7495 JM |
4862 | /** |
4863 | * pcie_get_mps - get PCI Express maximum payload size | |
4864 | * @dev: PCI device to query | |
4865 | * | |
4866 | * Returns maximum payload size in bytes | |
b03e7495 JM |
4867 | */ |
4868 | int pcie_get_mps(struct pci_dev *dev) | |
4869 | { | |
b03e7495 JM |
4870 | u16 ctl; |
4871 | ||
59875ae4 | 4872 | pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &ctl); |
b03e7495 | 4873 | |
59875ae4 | 4874 | return 128 << ((ctl & PCI_EXP_DEVCTL_PAYLOAD) >> 5); |
b03e7495 | 4875 | } |
f1c66c46 | 4876 | EXPORT_SYMBOL(pcie_get_mps); |
b03e7495 JM |
4877 | |
4878 | /** | |
4879 | * pcie_set_mps - set PCI Express maximum payload size | |
4880 | * @dev: PCI device to query | |
47c08f31 | 4881 | * @mps: maximum payload size in bytes |
b03e7495 JM |
4882 | * valid values are 128, 256, 512, 1024, 2048, 4096 |
4883 | * | |
4884 | * If possible sets maximum payload size | |
4885 | */ | |
4886 | int pcie_set_mps(struct pci_dev *dev, int mps) | |
4887 | { | |
59875ae4 | 4888 | u16 v; |
b03e7495 JM |
4889 | |
4890 | if (mps < 128 || mps > 4096 || !is_power_of_2(mps)) | |
59875ae4 | 4891 | return -EINVAL; |
b03e7495 JM |
4892 | |
4893 | v = ffs(mps) - 8; | |
f7625980 | 4894 | if (v > dev->pcie_mpss) |
59875ae4 | 4895 | return -EINVAL; |
b03e7495 JM |
4896 | v <<= 5; |
4897 | ||
59875ae4 JL |
4898 | return pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL, |
4899 | PCI_EXP_DEVCTL_PAYLOAD, v); | |
b03e7495 | 4900 | } |
f1c66c46 | 4901 | EXPORT_SYMBOL(pcie_set_mps); |
b03e7495 | 4902 | |
81377c8d JK |
4903 | /** |
4904 | * pcie_get_minimum_link - determine minimum link settings of a PCI device | |
4905 | * @dev: PCI device to query | |
4906 | * @speed: storage for minimum speed | |
4907 | * @width: storage for minimum width | |
4908 | * | |
4909 | * This function will walk up the PCI device chain and determine the minimum | |
4910 | * link width and speed of the device. | |
4911 | */ | |
4912 | int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed, | |
4913 | enum pcie_link_width *width) | |
4914 | { | |
4915 | int ret; | |
4916 | ||
4917 | *speed = PCI_SPEED_UNKNOWN; | |
4918 | *width = PCIE_LNK_WIDTH_UNKNOWN; | |
4919 | ||
4920 | while (dev) { | |
4921 | u16 lnksta; | |
4922 | enum pci_bus_speed next_speed; | |
4923 | enum pcie_link_width next_width; | |
4924 | ||
4925 | ret = pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &lnksta); | |
4926 | if (ret) | |
4927 | return ret; | |
4928 | ||
4929 | next_speed = pcie_link_speed[lnksta & PCI_EXP_LNKSTA_CLS]; | |
4930 | next_width = (lnksta & PCI_EXP_LNKSTA_NLW) >> | |
4931 | PCI_EXP_LNKSTA_NLW_SHIFT; | |
4932 | ||
4933 | if (next_speed < *speed) | |
4934 | *speed = next_speed; | |
4935 | ||
4936 | if (next_width < *width) | |
4937 | *width = next_width; | |
4938 | ||
4939 | dev = dev->bus->self; | |
4940 | } | |
4941 | ||
4942 | return 0; | |
4943 | } | |
4944 | EXPORT_SYMBOL(pcie_get_minimum_link); | |
4945 | ||
c87deff7 HS |
4946 | /** |
4947 | * pci_select_bars - Make BAR mask from the type of resource | |
f95d882d | 4948 | * @dev: the PCI device for which BAR mask is made |
c87deff7 HS |
4949 | * @flags: resource type mask to be selected |
4950 | * | |
4951 | * This helper routine makes bar mask from the type of resource. | |
4952 | */ | |
4953 | int pci_select_bars(struct pci_dev *dev, unsigned long flags) | |
4954 | { | |
4955 | int i, bars = 0; | |
4956 | for (i = 0; i < PCI_NUM_RESOURCES; i++) | |
4957 | if (pci_resource_flags(dev, i) & flags) | |
4958 | bars |= (1 << i); | |
4959 | return bars; | |
4960 | } | |
b7fe9434 | 4961 | EXPORT_SYMBOL(pci_select_bars); |
c87deff7 | 4962 | |
95a8b6ef MT |
4963 | /* Some architectures require additional programming to enable VGA */ |
4964 | static arch_set_vga_state_t arch_set_vga_state; | |
4965 | ||
4966 | void __init pci_register_set_vga_state(arch_set_vga_state_t func) | |
4967 | { | |
4968 | arch_set_vga_state = func; /* NULL disables */ | |
4969 | } | |
4970 | ||
4971 | static int pci_set_vga_state_arch(struct pci_dev *dev, bool decode, | |
3c78bc61 | 4972 | unsigned int command_bits, u32 flags) |
95a8b6ef MT |
4973 | { |
4974 | if (arch_set_vga_state) | |
4975 | return arch_set_vga_state(dev, decode, command_bits, | |
7ad35cf2 | 4976 | flags); |
95a8b6ef MT |
4977 | return 0; |
4978 | } | |
4979 | ||
deb2d2ec BH |
4980 | /** |
4981 | * pci_set_vga_state - set VGA decode state on device and parents if requested | |
19eea630 RD |
4982 | * @dev: the PCI device |
4983 | * @decode: true = enable decoding, false = disable decoding | |
4984 | * @command_bits: PCI_COMMAND_IO and/or PCI_COMMAND_MEMORY | |
3f37d622 | 4985 | * @flags: traverse ancestors and change bridges |
3448a19d | 4986 | * CHANGE_BRIDGE_ONLY / CHANGE_BRIDGE |
deb2d2ec BH |
4987 | */ |
4988 | int pci_set_vga_state(struct pci_dev *dev, bool decode, | |
3448a19d | 4989 | unsigned int command_bits, u32 flags) |
deb2d2ec BH |
4990 | { |
4991 | struct pci_bus *bus; | |
4992 | struct pci_dev *bridge; | |
4993 | u16 cmd; | |
95a8b6ef | 4994 | int rc; |
deb2d2ec | 4995 | |
67ebd814 | 4996 | WARN_ON((flags & PCI_VGA_STATE_CHANGE_DECODES) && (command_bits & ~(PCI_COMMAND_IO|PCI_COMMAND_MEMORY))); |
deb2d2ec | 4997 | |
95a8b6ef | 4998 | /* ARCH specific VGA enables */ |
3448a19d | 4999 | rc = pci_set_vga_state_arch(dev, decode, command_bits, flags); |
95a8b6ef MT |
5000 | if (rc) |
5001 | return rc; | |
5002 | ||
3448a19d DA |
5003 | if (flags & PCI_VGA_STATE_CHANGE_DECODES) { |
5004 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
5005 | if (decode == true) | |
5006 | cmd |= command_bits; | |
5007 | else | |
5008 | cmd &= ~command_bits; | |
5009 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
5010 | } | |
deb2d2ec | 5011 | |
3448a19d | 5012 | if (!(flags & PCI_VGA_STATE_CHANGE_BRIDGE)) |
deb2d2ec BH |
5013 | return 0; |
5014 | ||
5015 | bus = dev->bus; | |
5016 | while (bus) { | |
5017 | bridge = bus->self; | |
5018 | if (bridge) { | |
5019 | pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, | |
5020 | &cmd); | |
5021 | if (decode == true) | |
5022 | cmd |= PCI_BRIDGE_CTL_VGA; | |
5023 | else | |
5024 | cmd &= ~PCI_BRIDGE_CTL_VGA; | |
5025 | pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, | |
5026 | cmd); | |
5027 | } | |
5028 | bus = bus->parent; | |
5029 | } | |
5030 | return 0; | |
5031 | } | |
5032 | ||
f0af9593 BH |
5033 | /** |
5034 | * pci_add_dma_alias - Add a DMA devfn alias for a device | |
5035 | * @dev: the PCI device for which alias is added | |
5036 | * @devfn: alias slot and function | |
5037 | * | |
5038 | * This helper encodes 8-bit devfn as bit number in dma_alias_mask. | |
5039 | * It should be called early, preferably as PCI fixup header quirk. | |
5040 | */ | |
5041 | void pci_add_dma_alias(struct pci_dev *dev, u8 devfn) | |
5042 | { | |
338c3149 JL |
5043 | if (!dev->dma_alias_mask) |
5044 | dev->dma_alias_mask = kcalloc(BITS_TO_LONGS(U8_MAX), | |
5045 | sizeof(long), GFP_KERNEL); | |
5046 | if (!dev->dma_alias_mask) { | |
5047 | dev_warn(&dev->dev, "Unable to allocate DMA alias mask\n"); | |
5048 | return; | |
5049 | } | |
5050 | ||
5051 | set_bit(devfn, dev->dma_alias_mask); | |
48c83080 BH |
5052 | dev_info(&dev->dev, "Enabling fixed DMA alias to %02x.%d\n", |
5053 | PCI_SLOT(devfn), PCI_FUNC(devfn)); | |
f0af9593 BH |
5054 | } |
5055 | ||
338c3149 JL |
5056 | bool pci_devs_are_dma_aliases(struct pci_dev *dev1, struct pci_dev *dev2) |
5057 | { | |
5058 | return (dev1->dma_alias_mask && | |
5059 | test_bit(dev2->devfn, dev1->dma_alias_mask)) || | |
5060 | (dev2->dma_alias_mask && | |
5061 | test_bit(dev1->devfn, dev2->dma_alias_mask)); | |
5062 | } | |
5063 | ||
8496e85c RW |
5064 | bool pci_device_is_present(struct pci_dev *pdev) |
5065 | { | |
5066 | u32 v; | |
5067 | ||
fe2bd75b KB |
5068 | if (pci_dev_is_disconnected(pdev)) |
5069 | return false; | |
8496e85c RW |
5070 | return pci_bus_read_dev_vendor_id(pdev->bus, pdev->devfn, &v, 0); |
5071 | } | |
5072 | EXPORT_SYMBOL_GPL(pci_device_is_present); | |
5073 | ||
08249651 RW |
5074 | void pci_ignore_hotplug(struct pci_dev *dev) |
5075 | { | |
5076 | struct pci_dev *bridge = dev->bus->self; | |
5077 | ||
5078 | dev->ignore_hotplug = 1; | |
5079 | /* Propagate the "ignore hotplug" setting to the parent bridge. */ | |
5080 | if (bridge) | |
5081 | bridge->ignore_hotplug = 1; | |
5082 | } | |
5083 | EXPORT_SYMBOL_GPL(pci_ignore_hotplug); | |
5084 | ||
0a701aa6 YX |
5085 | resource_size_t __weak pcibios_default_alignment(void) |
5086 | { | |
5087 | return 0; | |
5088 | } | |
5089 | ||
32a9a682 YS |
5090 | #define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE |
5091 | static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0}; | |
e9d1e492 | 5092 | static DEFINE_SPINLOCK(resource_alignment_lock); |
32a9a682 YS |
5093 | |
5094 | /** | |
5095 | * pci_specified_resource_alignment - get resource alignment specified by user. | |
5096 | * @dev: the PCI device to get | |
e3adec72 | 5097 | * @resize: whether or not to change resources' size when reassigning alignment |
32a9a682 YS |
5098 | * |
5099 | * RETURNS: Resource alignment if it is specified. | |
5100 | * Zero if it is not specified. | |
5101 | */ | |
e3adec72 YX |
5102 | static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev, |
5103 | bool *resize) | |
32a9a682 YS |
5104 | { |
5105 | int seg, bus, slot, func, align_order, count; | |
644a544f | 5106 | unsigned short vendor, device, subsystem_vendor, subsystem_device; |
0a701aa6 | 5107 | resource_size_t align = pcibios_default_alignment(); |
32a9a682 YS |
5108 | char *p; |
5109 | ||
5110 | spin_lock(&resource_alignment_lock); | |
5111 | p = resource_alignment_param; | |
0a701aa6 | 5112 | if (!*p && !align) |
f0b99f70 YX |
5113 | goto out; |
5114 | if (pci_has_flag(PCI_PROBE_ONLY)) { | |
0a701aa6 | 5115 | align = 0; |
f0b99f70 YX |
5116 | pr_info_once("PCI: Ignoring requested alignments (PCI_PROBE_ONLY)\n"); |
5117 | goto out; | |
5118 | } | |
5119 | ||
32a9a682 YS |
5120 | while (*p) { |
5121 | count = 0; | |
5122 | if (sscanf(p, "%d%n", &align_order, &count) == 1 && | |
5123 | p[count] == '@') { | |
5124 | p += count + 1; | |
5125 | } else { | |
5126 | align_order = -1; | |
5127 | } | |
644a544f KMEE |
5128 | if (strncmp(p, "pci:", 4) == 0) { |
5129 | /* PCI vendor/device (subvendor/subdevice) ids are specified */ | |
5130 | p += 4; | |
5131 | if (sscanf(p, "%hx:%hx:%hx:%hx%n", | |
5132 | &vendor, &device, &subsystem_vendor, &subsystem_device, &count) != 4) { | |
5133 | if (sscanf(p, "%hx:%hx%n", &vendor, &device, &count) != 2) { | |
5134 | printk(KERN_ERR "PCI: Can't parse resource_alignment parameter: pci:%s\n", | |
5135 | p); | |
5136 | break; | |
5137 | } | |
5138 | subsystem_vendor = subsystem_device = 0; | |
5139 | } | |
5140 | p += count; | |
5141 | if ((!vendor || (vendor == dev->vendor)) && | |
5142 | (!device || (device == dev->device)) && | |
5143 | (!subsystem_vendor || (subsystem_vendor == dev->subsystem_vendor)) && | |
5144 | (!subsystem_device || (subsystem_device == dev->subsystem_device))) { | |
e3adec72 | 5145 | *resize = true; |
644a544f KMEE |
5146 | if (align_order == -1) |
5147 | align = PAGE_SIZE; | |
5148 | else | |
5149 | align = 1 << align_order; | |
5150 | /* Found */ | |
32a9a682 YS |
5151 | break; |
5152 | } | |
5153 | } | |
644a544f KMEE |
5154 | else { |
5155 | if (sscanf(p, "%x:%x:%x.%x%n", | |
5156 | &seg, &bus, &slot, &func, &count) != 4) { | |
5157 | seg = 0; | |
5158 | if (sscanf(p, "%x:%x.%x%n", | |
5159 | &bus, &slot, &func, &count) != 3) { | |
5160 | /* Invalid format */ | |
5161 | printk(KERN_ERR "PCI: Can't parse resource_alignment parameter: %s\n", | |
5162 | p); | |
5163 | break; | |
5164 | } | |
5165 | } | |
5166 | p += count; | |
5167 | if (seg == pci_domain_nr(dev->bus) && | |
5168 | bus == dev->bus->number && | |
5169 | slot == PCI_SLOT(dev->devfn) && | |
5170 | func == PCI_FUNC(dev->devfn)) { | |
e3adec72 | 5171 | *resize = true; |
644a544f KMEE |
5172 | if (align_order == -1) |
5173 | align = PAGE_SIZE; | |
5174 | else | |
5175 | align = 1 << align_order; | |
5176 | /* Found */ | |
5177 | break; | |
5178 | } | |
32a9a682 YS |
5179 | } |
5180 | if (*p != ';' && *p != ',') { | |
5181 | /* End of param or invalid format */ | |
5182 | break; | |
5183 | } | |
5184 | p++; | |
5185 | } | |
f0b99f70 | 5186 | out: |
32a9a682 YS |
5187 | spin_unlock(&resource_alignment_lock); |
5188 | return align; | |
5189 | } | |
5190 | ||
81a5e70e | 5191 | static void pci_request_resource_alignment(struct pci_dev *dev, int bar, |
e3adec72 | 5192 | resource_size_t align, bool resize) |
81a5e70e BH |
5193 | { |
5194 | struct resource *r = &dev->resource[bar]; | |
5195 | resource_size_t size; | |
5196 | ||
5197 | if (!(r->flags & IORESOURCE_MEM)) | |
5198 | return; | |
5199 | ||
5200 | if (r->flags & IORESOURCE_PCI_FIXED) { | |
5201 | dev_info(&dev->dev, "BAR%d %pR: ignoring requested alignment %#llx\n", | |
5202 | bar, r, (unsigned long long)align); | |
5203 | return; | |
5204 | } | |
5205 | ||
5206 | size = resource_size(r); | |
0dde1c08 BH |
5207 | if (size >= align) |
5208 | return; | |
81a5e70e | 5209 | |
0dde1c08 | 5210 | /* |
e3adec72 YX |
5211 | * Increase the alignment of the resource. There are two ways we |
5212 | * can do this: | |
0dde1c08 | 5213 | * |
e3adec72 YX |
5214 | * 1) Increase the size of the resource. BARs are aligned on their |
5215 | * size, so when we reallocate space for this resource, we'll | |
5216 | * allocate it with the larger alignment. This also prevents | |
5217 | * assignment of any other BARs inside the alignment region, so | |
5218 | * if we're requesting page alignment, this means no other BARs | |
5219 | * will share the page. | |
5220 | * | |
5221 | * The disadvantage is that this makes the resource larger than | |
5222 | * the hardware BAR, which may break drivers that compute things | |
5223 | * based on the resource size, e.g., to find registers at a | |
5224 | * fixed offset before the end of the BAR. | |
5225 | * | |
5226 | * 2) Retain the resource size, but use IORESOURCE_STARTALIGN and | |
5227 | * set r->start to the desired alignment. By itself this | |
5228 | * doesn't prevent other BARs being put inside the alignment | |
5229 | * region, but if we realign *every* resource of every device in | |
5230 | * the system, none of them will share an alignment region. | |
5231 | * | |
5232 | * When the user has requested alignment for only some devices via | |
5233 | * the "pci=resource_alignment" argument, "resize" is true and we | |
5234 | * use the first method. Otherwise we assume we're aligning all | |
5235 | * devices and we use the second. | |
0dde1c08 | 5236 | */ |
e3adec72 | 5237 | |
0dde1c08 BH |
5238 | dev_info(&dev->dev, "BAR%d %pR: requesting alignment to %#llx\n", |
5239 | bar, r, (unsigned long long)align); | |
81a5e70e | 5240 | |
e3adec72 YX |
5241 | if (resize) { |
5242 | r->start = 0; | |
5243 | r->end = align - 1; | |
5244 | } else { | |
5245 | r->flags &= ~IORESOURCE_SIZEALIGN; | |
5246 | r->flags |= IORESOURCE_STARTALIGN; | |
5247 | r->start = align; | |
5248 | r->end = r->start + size - 1; | |
5249 | } | |
0dde1c08 | 5250 | r->flags |= IORESOURCE_UNSET; |
81a5e70e BH |
5251 | } |
5252 | ||
2069ecfb YL |
5253 | /* |
5254 | * This function disables memory decoding and releases memory resources | |
5255 | * of the device specified by kernel's boot parameter 'pci=resource_alignment='. | |
5256 | * It also rounds up size to specified alignment. | |
5257 | * Later on, the kernel will assign page-aligned memory resource back | |
5258 | * to the device. | |
5259 | */ | |
5260 | void pci_reassigndev_resource_alignment(struct pci_dev *dev) | |
5261 | { | |
5262 | int i; | |
5263 | struct resource *r; | |
81a5e70e | 5264 | resource_size_t align; |
2069ecfb | 5265 | u16 command; |
e3adec72 | 5266 | bool resize = false; |
2069ecfb | 5267 | |
62d9a78f YX |
5268 | /* |
5269 | * VF BARs are read-only zero according to SR-IOV spec r1.1, sec | |
5270 | * 3.4.1.11. Their resources are allocated from the space | |
5271 | * described by the VF BARx register in the PF's SR-IOV capability. | |
5272 | * We can't influence their alignment here. | |
5273 | */ | |
5274 | if (dev->is_virtfn) | |
5275 | return; | |
5276 | ||
10c463a7 | 5277 | /* check if specified PCI is target device to reassign */ |
e3adec72 | 5278 | align = pci_specified_resource_alignment(dev, &resize); |
10c463a7 | 5279 | if (!align) |
2069ecfb YL |
5280 | return; |
5281 | ||
5282 | if (dev->hdr_type == PCI_HEADER_TYPE_NORMAL && | |
5283 | (dev->class >> 8) == PCI_CLASS_BRIDGE_HOST) { | |
5284 | dev_warn(&dev->dev, | |
5285 | "Can't reassign resources to host bridge.\n"); | |
5286 | return; | |
5287 | } | |
5288 | ||
5289 | dev_info(&dev->dev, | |
5290 | "Disabling memory decoding and releasing memory resources.\n"); | |
5291 | pci_read_config_word(dev, PCI_COMMAND, &command); | |
5292 | command &= ~PCI_COMMAND_MEMORY; | |
5293 | pci_write_config_word(dev, PCI_COMMAND, command); | |
5294 | ||
81a5e70e | 5295 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) |
e3adec72 | 5296 | pci_request_resource_alignment(dev, i, align, resize); |
f0b99f70 | 5297 | |
81a5e70e BH |
5298 | /* |
5299 | * Need to disable bridge's resource window, | |
2069ecfb YL |
5300 | * to enable the kernel to reassign new resource |
5301 | * window later on. | |
5302 | */ | |
5303 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && | |
5304 | (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { | |
5305 | for (i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) { | |
5306 | r = &dev->resource[i]; | |
5307 | if (!(r->flags & IORESOURCE_MEM)) | |
5308 | continue; | |
bd064f0a | 5309 | r->flags |= IORESOURCE_UNSET; |
2069ecfb YL |
5310 | r->end = resource_size(r) - 1; |
5311 | r->start = 0; | |
5312 | } | |
5313 | pci_disable_bridge_window(dev); | |
5314 | } | |
5315 | } | |
5316 | ||
9738abed | 5317 | static ssize_t pci_set_resource_alignment_param(const char *buf, size_t count) |
32a9a682 YS |
5318 | { |
5319 | if (count > RESOURCE_ALIGNMENT_PARAM_SIZE - 1) | |
5320 | count = RESOURCE_ALIGNMENT_PARAM_SIZE - 1; | |
5321 | spin_lock(&resource_alignment_lock); | |
5322 | strncpy(resource_alignment_param, buf, count); | |
5323 | resource_alignment_param[count] = '\0'; | |
5324 | spin_unlock(&resource_alignment_lock); | |
5325 | return count; | |
5326 | } | |
5327 | ||
9738abed | 5328 | static ssize_t pci_get_resource_alignment_param(char *buf, size_t size) |
32a9a682 YS |
5329 | { |
5330 | size_t count; | |
5331 | spin_lock(&resource_alignment_lock); | |
5332 | count = snprintf(buf, size, "%s", resource_alignment_param); | |
5333 | spin_unlock(&resource_alignment_lock); | |
5334 | return count; | |
5335 | } | |
5336 | ||
5337 | static ssize_t pci_resource_alignment_show(struct bus_type *bus, char *buf) | |
5338 | { | |
5339 | return pci_get_resource_alignment_param(buf, PAGE_SIZE); | |
5340 | } | |
5341 | ||
5342 | static ssize_t pci_resource_alignment_store(struct bus_type *bus, | |
5343 | const char *buf, size_t count) | |
5344 | { | |
5345 | return pci_set_resource_alignment_param(buf, count); | |
5346 | } | |
5347 | ||
21751a9a | 5348 | static BUS_ATTR(resource_alignment, 0644, pci_resource_alignment_show, |
32a9a682 YS |
5349 | pci_resource_alignment_store); |
5350 | ||
5351 | static int __init pci_resource_alignment_sysfs_init(void) | |
5352 | { | |
5353 | return bus_create_file(&pci_bus_type, | |
5354 | &bus_attr_resource_alignment); | |
5355 | } | |
32a9a682 YS |
5356 | late_initcall(pci_resource_alignment_sysfs_init); |
5357 | ||
15856ad5 | 5358 | static void pci_no_domains(void) |
32a2eea7 JG |
5359 | { |
5360 | #ifdef CONFIG_PCI_DOMAINS | |
5361 | pci_domains_supported = 0; | |
5362 | #endif | |
5363 | } | |
5364 | ||
41e5c0f8 LD |
5365 | #ifdef CONFIG_PCI_DOMAINS |
5366 | static atomic_t __domain_nr = ATOMIC_INIT(-1); | |
5367 | ||
5368 | int pci_get_new_domain_nr(void) | |
5369 | { | |
5370 | return atomic_inc_return(&__domain_nr); | |
5371 | } | |
7c674700 LP |
5372 | |
5373 | #ifdef CONFIG_PCI_DOMAINS_GENERIC | |
1a4f93f7 | 5374 | static int of_pci_bus_find_domain_nr(struct device *parent) |
7c674700 LP |
5375 | { |
5376 | static int use_dt_domains = -1; | |
54c6e2dd | 5377 | int domain = -1; |
7c674700 | 5378 | |
54c6e2dd KHC |
5379 | if (parent) |
5380 | domain = of_get_pci_domain_nr(parent->of_node); | |
7c674700 LP |
5381 | /* |
5382 | * Check DT domain and use_dt_domains values. | |
5383 | * | |
5384 | * If DT domain property is valid (domain >= 0) and | |
5385 | * use_dt_domains != 0, the DT assignment is valid since this means | |
5386 | * we have not previously allocated a domain number by using | |
5387 | * pci_get_new_domain_nr(); we should also update use_dt_domains to | |
5388 | * 1, to indicate that we have just assigned a domain number from | |
5389 | * DT. | |
5390 | * | |
5391 | * If DT domain property value is not valid (ie domain < 0), and we | |
5392 | * have not previously assigned a domain number from DT | |
5393 | * (use_dt_domains != 1) we should assign a domain number by | |
5394 | * using the: | |
5395 | * | |
5396 | * pci_get_new_domain_nr() | |
5397 | * | |
5398 | * API and update the use_dt_domains value to keep track of method we | |
5399 | * are using to assign domain numbers (use_dt_domains = 0). | |
5400 | * | |
5401 | * All other combinations imply we have a platform that is trying | |
5402 | * to mix domain numbers obtained from DT and pci_get_new_domain_nr(), | |
5403 | * which is a recipe for domain mishandling and it is prevented by | |
5404 | * invalidating the domain value (domain = -1) and printing a | |
5405 | * corresponding error. | |
5406 | */ | |
5407 | if (domain >= 0 && use_dt_domains) { | |
5408 | use_dt_domains = 1; | |
5409 | } else if (domain < 0 && use_dt_domains != 1) { | |
5410 | use_dt_domains = 0; | |
5411 | domain = pci_get_new_domain_nr(); | |
5412 | } else { | |
5413 | dev_err(parent, "Node %s has inconsistent \"linux,pci-domain\" property in DT\n", | |
5414 | parent->of_node->full_name); | |
5415 | domain = -1; | |
5416 | } | |
5417 | ||
9c7cb891 | 5418 | return domain; |
7c674700 | 5419 | } |
1a4f93f7 TN |
5420 | |
5421 | int pci_bus_find_domain_nr(struct pci_bus *bus, struct device *parent) | |
5422 | { | |
2ab51dde TN |
5423 | return acpi_disabled ? of_pci_bus_find_domain_nr(parent) : |
5424 | acpi_pci_bus_find_domain_nr(bus); | |
7c674700 LP |
5425 | } |
5426 | #endif | |
41e5c0f8 LD |
5427 | #endif |
5428 | ||
0ef5f8f6 | 5429 | /** |
642c92da | 5430 | * pci_ext_cfg_avail - can we access extended PCI config space? |
0ef5f8f6 AP |
5431 | * |
5432 | * Returns 1 if we can access PCI extended config space (offsets | |
5433 | * greater than 0xff). This is the default implementation. Architecture | |
5434 | * implementations can override this. | |
5435 | */ | |
642c92da | 5436 | int __weak pci_ext_cfg_avail(void) |
0ef5f8f6 AP |
5437 | { |
5438 | return 1; | |
5439 | } | |
5440 | ||
2d1c8618 BH |
5441 | void __weak pci_fixup_cardbus(struct pci_bus *bus) |
5442 | { | |
5443 | } | |
5444 | EXPORT_SYMBOL(pci_fixup_cardbus); | |
5445 | ||
ad04d31e | 5446 | static int __init pci_setup(char *str) |
1da177e4 LT |
5447 | { |
5448 | while (str) { | |
5449 | char *k = strchr(str, ','); | |
5450 | if (k) | |
5451 | *k++ = 0; | |
5452 | if (*str && (str = pcibios_setup(str)) && *str) { | |
309e57df MW |
5453 | if (!strcmp(str, "nomsi")) { |
5454 | pci_no_msi(); | |
7f785763 RD |
5455 | } else if (!strcmp(str, "noaer")) { |
5456 | pci_no_aer(); | |
b55438fd YL |
5457 | } else if (!strncmp(str, "realloc=", 8)) { |
5458 | pci_realloc_get_opt(str + 8); | |
f483d392 | 5459 | } else if (!strncmp(str, "realloc", 7)) { |
b55438fd | 5460 | pci_realloc_get_opt("on"); |
32a2eea7 JG |
5461 | } else if (!strcmp(str, "nodomains")) { |
5462 | pci_no_domains(); | |
6748dcc2 RW |
5463 | } else if (!strncmp(str, "noari", 5)) { |
5464 | pcie_ari_disabled = true; | |
4516a618 AN |
5465 | } else if (!strncmp(str, "cbiosize=", 9)) { |
5466 | pci_cardbus_io_size = memparse(str + 9, &str); | |
5467 | } else if (!strncmp(str, "cbmemsize=", 10)) { | |
5468 | pci_cardbus_mem_size = memparse(str + 10, &str); | |
32a9a682 YS |
5469 | } else if (!strncmp(str, "resource_alignment=", 19)) { |
5470 | pci_set_resource_alignment_param(str + 19, | |
5471 | strlen(str + 19)); | |
43c16408 AP |
5472 | } else if (!strncmp(str, "ecrc=", 5)) { |
5473 | pcie_ecrc_get_policy(str + 5); | |
28760489 EB |
5474 | } else if (!strncmp(str, "hpiosize=", 9)) { |
5475 | pci_hotplug_io_size = memparse(str + 9, &str); | |
5476 | } else if (!strncmp(str, "hpmemsize=", 10)) { | |
5477 | pci_hotplug_mem_size = memparse(str + 10, &str); | |
e16b4660 KB |
5478 | } else if (!strncmp(str, "hpbussize=", 10)) { |
5479 | pci_hotplug_bus_size = | |
5480 | simple_strtoul(str + 10, &str, 0); | |
5481 | if (pci_hotplug_bus_size > 0xff) | |
5482 | pci_hotplug_bus_size = DEFAULT_HOTPLUG_BUS_SIZE; | |
5f39e670 JM |
5483 | } else if (!strncmp(str, "pcie_bus_tune_off", 17)) { |
5484 | pcie_bus_config = PCIE_BUS_TUNE_OFF; | |
b03e7495 JM |
5485 | } else if (!strncmp(str, "pcie_bus_safe", 13)) { |
5486 | pcie_bus_config = PCIE_BUS_SAFE; | |
5487 | } else if (!strncmp(str, "pcie_bus_perf", 13)) { | |
5488 | pcie_bus_config = PCIE_BUS_PERFORMANCE; | |
5f39e670 JM |
5489 | } else if (!strncmp(str, "pcie_bus_peer2peer", 18)) { |
5490 | pcie_bus_config = PCIE_BUS_PEER2PEER; | |
284f5f9d BH |
5491 | } else if (!strncmp(str, "pcie_scan_all", 13)) { |
5492 | pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS); | |
309e57df MW |
5493 | } else { |
5494 | printk(KERN_ERR "PCI: Unknown option `%s'\n", | |
5495 | str); | |
5496 | } | |
1da177e4 LT |
5497 | } |
5498 | str = k; | |
5499 | } | |
0637a70a | 5500 | return 0; |
1da177e4 | 5501 | } |
0637a70a | 5502 | early_param("pci", pci_setup); |