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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> |
4ebeb1ec | 31 | #include <linux/pci-ats.h> |
32a9a682 | 32 | #include <asm/setup.h> |
2a2aca31 | 33 | #include <asm/dma.h> |
b07461a8 | 34 | #include <linux/aer.h> |
bc56b9e0 | 35 | #include "pci.h" |
1da177e4 | 36 | |
00240c38 AS |
37 | const char *pci_power_names[] = { |
38 | "error", "D0", "D1", "D2", "D3hot", "D3cold", "unknown", | |
39 | }; | |
40 | EXPORT_SYMBOL_GPL(pci_power_names); | |
41 | ||
93177a74 RW |
42 | int isa_dma_bridge_buggy; |
43 | EXPORT_SYMBOL(isa_dma_bridge_buggy); | |
44 | ||
45 | int pci_pci_problems; | |
46 | EXPORT_SYMBOL(pci_pci_problems); | |
47 | ||
1ae861e6 RW |
48 | unsigned int pci_pm_d3_delay; |
49 | ||
df17e62e MG |
50 | static void pci_pme_list_scan(struct work_struct *work); |
51 | ||
52 | static LIST_HEAD(pci_pme_list); | |
53 | static DEFINE_MUTEX(pci_pme_list_mutex); | |
54 | static DECLARE_DELAYED_WORK(pci_pme_work, pci_pme_list_scan); | |
55 | ||
56 | struct pci_pme_device { | |
57 | struct list_head list; | |
58 | struct pci_dev *dev; | |
59 | }; | |
60 | ||
61 | #define PME_TIMEOUT 1000 /* How long between PME checks */ | |
62 | ||
1ae861e6 RW |
63 | static void pci_dev_d3_sleep(struct pci_dev *dev) |
64 | { | |
65 | unsigned int delay = dev->d3_delay; | |
66 | ||
67 | if (delay < pci_pm_d3_delay) | |
68 | delay = pci_pm_d3_delay; | |
69 | ||
50b2b540 AH |
70 | if (delay) |
71 | msleep(delay); | |
1ae861e6 | 72 | } |
1da177e4 | 73 | |
32a2eea7 JG |
74 | #ifdef CONFIG_PCI_DOMAINS |
75 | int pci_domains_supported = 1; | |
76 | #endif | |
77 | ||
4516a618 AN |
78 | #define DEFAULT_CARDBUS_IO_SIZE (256) |
79 | #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024) | |
80 | /* pci=cbmemsize=nnM,cbiosize=nn can override this */ | |
81 | unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE; | |
82 | unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE; | |
83 | ||
28760489 EB |
84 | #define DEFAULT_HOTPLUG_IO_SIZE (256) |
85 | #define DEFAULT_HOTPLUG_MEM_SIZE (2*1024*1024) | |
86 | /* pci=hpmemsize=nnM,hpiosize=nn can override this */ | |
87 | unsigned long pci_hotplug_io_size = DEFAULT_HOTPLUG_IO_SIZE; | |
88 | unsigned long pci_hotplug_mem_size = DEFAULT_HOTPLUG_MEM_SIZE; | |
89 | ||
e16b4660 KB |
90 | #define DEFAULT_HOTPLUG_BUS_SIZE 1 |
91 | unsigned long pci_hotplug_bus_size = DEFAULT_HOTPLUG_BUS_SIZE; | |
92 | ||
27d868b5 | 93 | enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_DEFAULT; |
b03e7495 | 94 | |
ac1aa47b JB |
95 | /* |
96 | * The default CLS is used if arch didn't set CLS explicitly and not | |
97 | * all pci devices agree on the same value. Arch can override either | |
98 | * the dfl or actual value as it sees fit. Don't forget this is | |
99 | * measured in 32-bit words, not bytes. | |
100 | */ | |
15856ad5 | 101 | u8 pci_dfl_cache_line_size = L1_CACHE_BYTES >> 2; |
ac1aa47b JB |
102 | u8 pci_cache_line_size; |
103 | ||
96c55900 MS |
104 | /* |
105 | * If we set up a device for bus mastering, we need to check the latency | |
106 | * timer as certain BIOSes forget to set it properly. | |
107 | */ | |
108 | unsigned int pcibios_max_latency = 255; | |
109 | ||
6748dcc2 RW |
110 | /* If set, the PCIe ARI capability will not be used. */ |
111 | static bool pcie_ari_disabled; | |
112 | ||
9d26d3a8 MW |
113 | /* Disable bridge_d3 for all PCIe ports */ |
114 | static bool pci_bridge_d3_disable; | |
115 | /* Force bridge_d3 for all PCIe ports */ | |
116 | static bool pci_bridge_d3_force; | |
117 | ||
118 | static int __init pcie_port_pm_setup(char *str) | |
119 | { | |
120 | if (!strcmp(str, "off")) | |
121 | pci_bridge_d3_disable = true; | |
122 | else if (!strcmp(str, "force")) | |
123 | pci_bridge_d3_force = true; | |
124 | return 1; | |
125 | } | |
126 | __setup("pcie_port_pm=", pcie_port_pm_setup); | |
127 | ||
1da177e4 LT |
128 | /** |
129 | * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children | |
130 | * @bus: pointer to PCI bus structure to search | |
131 | * | |
132 | * Given a PCI bus, returns the highest PCI bus number present in the set | |
133 | * including the given PCI bus and its list of child PCI buses. | |
134 | */ | |
07656d83 | 135 | unsigned char pci_bus_max_busnr(struct pci_bus *bus) |
1da177e4 | 136 | { |
94e6a9b9 | 137 | struct pci_bus *tmp; |
1da177e4 LT |
138 | unsigned char max, n; |
139 | ||
b918c62e | 140 | max = bus->busn_res.end; |
94e6a9b9 YW |
141 | list_for_each_entry(tmp, &bus->children, node) { |
142 | n = pci_bus_max_busnr(tmp); | |
3c78bc61 | 143 | if (n > max) |
1da177e4 LT |
144 | max = n; |
145 | } | |
146 | return max; | |
147 | } | |
b82db5ce | 148 | EXPORT_SYMBOL_GPL(pci_bus_max_busnr); |
1da177e4 | 149 | |
1684f5dd AM |
150 | #ifdef CONFIG_HAS_IOMEM |
151 | void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar) | |
152 | { | |
1f7bf3bf BH |
153 | struct resource *res = &pdev->resource[bar]; |
154 | ||
1684f5dd AM |
155 | /* |
156 | * Make sure the BAR is actually a memory resource, not an IO resource | |
157 | */ | |
646c0282 | 158 | if (res->flags & IORESOURCE_UNSET || !(res->flags & IORESOURCE_MEM)) { |
1f7bf3bf | 159 | dev_warn(&pdev->dev, "can't ioremap BAR %d: %pR\n", bar, res); |
1684f5dd AM |
160 | return NULL; |
161 | } | |
1f7bf3bf | 162 | return ioremap_nocache(res->start, resource_size(res)); |
1684f5dd AM |
163 | } |
164 | EXPORT_SYMBOL_GPL(pci_ioremap_bar); | |
c43996f4 LR |
165 | |
166 | void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar) | |
167 | { | |
168 | /* | |
169 | * Make sure the BAR is actually a memory resource, not an IO resource | |
170 | */ | |
171 | if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) { | |
172 | WARN_ON(1); | |
173 | return NULL; | |
174 | } | |
175 | return ioremap_wc(pci_resource_start(pdev, bar), | |
176 | pci_resource_len(pdev, bar)); | |
177 | } | |
178 | EXPORT_SYMBOL_GPL(pci_ioremap_wc_bar); | |
1684f5dd AM |
179 | #endif |
180 | ||
687d5fe3 ME |
181 | |
182 | static int __pci_find_next_cap_ttl(struct pci_bus *bus, unsigned int devfn, | |
183 | u8 pos, int cap, int *ttl) | |
24a4e377 RD |
184 | { |
185 | u8 id; | |
55db3208 SS |
186 | u16 ent; |
187 | ||
188 | pci_bus_read_config_byte(bus, devfn, pos, &pos); | |
24a4e377 | 189 | |
687d5fe3 | 190 | while ((*ttl)--) { |
24a4e377 RD |
191 | if (pos < 0x40) |
192 | break; | |
193 | pos &= ~3; | |
55db3208 SS |
194 | pci_bus_read_config_word(bus, devfn, pos, &ent); |
195 | ||
196 | id = ent & 0xff; | |
24a4e377 RD |
197 | if (id == 0xff) |
198 | break; | |
199 | if (id == cap) | |
200 | return pos; | |
55db3208 | 201 | pos = (ent >> 8); |
24a4e377 RD |
202 | } |
203 | return 0; | |
204 | } | |
205 | ||
687d5fe3 ME |
206 | static int __pci_find_next_cap(struct pci_bus *bus, unsigned int devfn, |
207 | u8 pos, int cap) | |
208 | { | |
209 | int ttl = PCI_FIND_CAP_TTL; | |
210 | ||
211 | return __pci_find_next_cap_ttl(bus, devfn, pos, cap, &ttl); | |
212 | } | |
213 | ||
24a4e377 RD |
214 | int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap) |
215 | { | |
216 | return __pci_find_next_cap(dev->bus, dev->devfn, | |
217 | pos + PCI_CAP_LIST_NEXT, cap); | |
218 | } | |
219 | EXPORT_SYMBOL_GPL(pci_find_next_capability); | |
220 | ||
d3bac118 ME |
221 | static int __pci_bus_find_cap_start(struct pci_bus *bus, |
222 | unsigned int devfn, u8 hdr_type) | |
1da177e4 LT |
223 | { |
224 | u16 status; | |
1da177e4 LT |
225 | |
226 | pci_bus_read_config_word(bus, devfn, PCI_STATUS, &status); | |
227 | if (!(status & PCI_STATUS_CAP_LIST)) | |
228 | return 0; | |
229 | ||
230 | switch (hdr_type) { | |
231 | case PCI_HEADER_TYPE_NORMAL: | |
232 | case PCI_HEADER_TYPE_BRIDGE: | |
d3bac118 | 233 | return PCI_CAPABILITY_LIST; |
1da177e4 | 234 | case PCI_HEADER_TYPE_CARDBUS: |
d3bac118 | 235 | return PCI_CB_CAPABILITY_LIST; |
1da177e4 | 236 | } |
d3bac118 ME |
237 | |
238 | return 0; | |
1da177e4 LT |
239 | } |
240 | ||
241 | /** | |
f7625980 | 242 | * pci_find_capability - query for devices' capabilities |
1da177e4 LT |
243 | * @dev: PCI device to query |
244 | * @cap: capability code | |
245 | * | |
246 | * Tell if a device supports a given PCI capability. | |
247 | * Returns the address of the requested capability structure within the | |
248 | * device's PCI configuration space or 0 in case the device does not | |
249 | * support it. Possible values for @cap: | |
250 | * | |
f7625980 BH |
251 | * %PCI_CAP_ID_PM Power Management |
252 | * %PCI_CAP_ID_AGP Accelerated Graphics Port | |
253 | * %PCI_CAP_ID_VPD Vital Product Data | |
254 | * %PCI_CAP_ID_SLOTID Slot Identification | |
1da177e4 | 255 | * %PCI_CAP_ID_MSI Message Signalled Interrupts |
f7625980 | 256 | * %PCI_CAP_ID_CHSWP CompactPCI HotSwap |
1da177e4 LT |
257 | * %PCI_CAP_ID_PCIX PCI-X |
258 | * %PCI_CAP_ID_EXP PCI Express | |
259 | */ | |
260 | int pci_find_capability(struct pci_dev *dev, int cap) | |
261 | { | |
d3bac118 ME |
262 | int pos; |
263 | ||
264 | pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type); | |
265 | if (pos) | |
266 | pos = __pci_find_next_cap(dev->bus, dev->devfn, pos, cap); | |
267 | ||
268 | return pos; | |
1da177e4 | 269 | } |
b7fe9434 | 270 | EXPORT_SYMBOL(pci_find_capability); |
1da177e4 LT |
271 | |
272 | /** | |
f7625980 | 273 | * pci_bus_find_capability - query for devices' capabilities |
1da177e4 LT |
274 | * @bus: the PCI bus to query |
275 | * @devfn: PCI device to query | |
276 | * @cap: capability code | |
277 | * | |
278 | * Like pci_find_capability() but works for pci devices that do not have a | |
f7625980 | 279 | * pci_dev structure set up yet. |
1da177e4 LT |
280 | * |
281 | * Returns the address of the requested capability structure within the | |
282 | * device's PCI configuration space or 0 in case the device does not | |
283 | * support it. | |
284 | */ | |
285 | int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap) | |
286 | { | |
d3bac118 | 287 | int pos; |
1da177e4 LT |
288 | u8 hdr_type; |
289 | ||
290 | pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type); | |
291 | ||
d3bac118 ME |
292 | pos = __pci_bus_find_cap_start(bus, devfn, hdr_type & 0x7f); |
293 | if (pos) | |
294 | pos = __pci_find_next_cap(bus, devfn, pos, cap); | |
295 | ||
296 | return pos; | |
1da177e4 | 297 | } |
b7fe9434 | 298 | EXPORT_SYMBOL(pci_bus_find_capability); |
1da177e4 LT |
299 | |
300 | /** | |
44a9a36f | 301 | * pci_find_next_ext_capability - Find an extended capability |
1da177e4 | 302 | * @dev: PCI device to query |
44a9a36f | 303 | * @start: address at which to start looking (0 to start at beginning of list) |
1da177e4 LT |
304 | * @cap: capability code |
305 | * | |
44a9a36f | 306 | * Returns the address of the next matching extended capability structure |
1da177e4 | 307 | * within the device's PCI configuration space or 0 if the device does |
44a9a36f BH |
308 | * not support it. Some capabilities can occur several times, e.g., the |
309 | * vendor-specific capability, and this provides a way to find them all. | |
1da177e4 | 310 | */ |
44a9a36f | 311 | int pci_find_next_ext_capability(struct pci_dev *dev, int start, int cap) |
1da177e4 LT |
312 | { |
313 | u32 header; | |
557848c3 ZY |
314 | int ttl; |
315 | int pos = PCI_CFG_SPACE_SIZE; | |
1da177e4 | 316 | |
557848c3 ZY |
317 | /* minimum 8 bytes per capability */ |
318 | ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8; | |
319 | ||
320 | if (dev->cfg_size <= PCI_CFG_SPACE_SIZE) | |
1da177e4 LT |
321 | return 0; |
322 | ||
44a9a36f BH |
323 | if (start) |
324 | pos = start; | |
325 | ||
1da177e4 LT |
326 | if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL) |
327 | return 0; | |
328 | ||
329 | /* | |
330 | * If we have no capabilities, this is indicated by cap ID, | |
331 | * cap version and next pointer all being 0. | |
332 | */ | |
333 | if (header == 0) | |
334 | return 0; | |
335 | ||
336 | while (ttl-- > 0) { | |
44a9a36f | 337 | if (PCI_EXT_CAP_ID(header) == cap && pos != start) |
1da177e4 LT |
338 | return pos; |
339 | ||
340 | pos = PCI_EXT_CAP_NEXT(header); | |
557848c3 | 341 | if (pos < PCI_CFG_SPACE_SIZE) |
1da177e4 LT |
342 | break; |
343 | ||
344 | if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL) | |
345 | break; | |
346 | } | |
347 | ||
348 | return 0; | |
349 | } | |
44a9a36f BH |
350 | EXPORT_SYMBOL_GPL(pci_find_next_ext_capability); |
351 | ||
352 | /** | |
353 | * pci_find_ext_capability - Find an extended capability | |
354 | * @dev: PCI device to query | |
355 | * @cap: capability code | |
356 | * | |
357 | * Returns the address of the requested extended capability structure | |
358 | * within the device's PCI configuration space or 0 if the device does | |
359 | * not support it. Possible values for @cap: | |
360 | * | |
361 | * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting | |
362 | * %PCI_EXT_CAP_ID_VC Virtual Channel | |
363 | * %PCI_EXT_CAP_ID_DSN Device Serial Number | |
364 | * %PCI_EXT_CAP_ID_PWR Power Budgeting | |
365 | */ | |
366 | int pci_find_ext_capability(struct pci_dev *dev, int cap) | |
367 | { | |
368 | return pci_find_next_ext_capability(dev, 0, cap); | |
369 | } | |
3a720d72 | 370 | EXPORT_SYMBOL_GPL(pci_find_ext_capability); |
1da177e4 | 371 | |
687d5fe3 ME |
372 | static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap) |
373 | { | |
374 | int rc, ttl = PCI_FIND_CAP_TTL; | |
375 | u8 cap, mask; | |
376 | ||
377 | if (ht_cap == HT_CAPTYPE_SLAVE || ht_cap == HT_CAPTYPE_HOST) | |
378 | mask = HT_3BIT_CAP_MASK; | |
379 | else | |
380 | mask = HT_5BIT_CAP_MASK; | |
381 | ||
382 | pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, pos, | |
383 | PCI_CAP_ID_HT, &ttl); | |
384 | while (pos) { | |
385 | rc = pci_read_config_byte(dev, pos + 3, &cap); | |
386 | if (rc != PCIBIOS_SUCCESSFUL) | |
387 | return 0; | |
388 | ||
389 | if ((cap & mask) == ht_cap) | |
390 | return pos; | |
391 | ||
47a4d5be BG |
392 | pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, |
393 | pos + PCI_CAP_LIST_NEXT, | |
687d5fe3 ME |
394 | PCI_CAP_ID_HT, &ttl); |
395 | } | |
396 | ||
397 | return 0; | |
398 | } | |
399 | /** | |
400 | * pci_find_next_ht_capability - query a device's Hypertransport capabilities | |
401 | * @dev: PCI device to query | |
402 | * @pos: Position from which to continue searching | |
403 | * @ht_cap: Hypertransport capability code | |
404 | * | |
405 | * To be used in conjunction with pci_find_ht_capability() to search for | |
406 | * all capabilities matching @ht_cap. @pos should always be a value returned | |
407 | * from pci_find_ht_capability(). | |
408 | * | |
409 | * NB. To be 100% safe against broken PCI devices, the caller should take | |
410 | * steps to avoid an infinite loop. | |
411 | */ | |
412 | int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap) | |
413 | { | |
414 | return __pci_find_next_ht_cap(dev, pos + PCI_CAP_LIST_NEXT, ht_cap); | |
415 | } | |
416 | EXPORT_SYMBOL_GPL(pci_find_next_ht_capability); | |
417 | ||
418 | /** | |
419 | * pci_find_ht_capability - query a device's Hypertransport capabilities | |
420 | * @dev: PCI device to query | |
421 | * @ht_cap: Hypertransport capability code | |
422 | * | |
423 | * Tell if a device supports a given Hypertransport capability. | |
424 | * Returns an address within the device's PCI configuration space | |
425 | * or 0 in case the device does not support the request capability. | |
426 | * The address points to the PCI capability, of type PCI_CAP_ID_HT, | |
427 | * which has a Hypertransport capability matching @ht_cap. | |
428 | */ | |
429 | int pci_find_ht_capability(struct pci_dev *dev, int ht_cap) | |
430 | { | |
431 | int pos; | |
432 | ||
433 | pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type); | |
434 | if (pos) | |
435 | pos = __pci_find_next_ht_cap(dev, pos, ht_cap); | |
436 | ||
437 | return pos; | |
438 | } | |
439 | EXPORT_SYMBOL_GPL(pci_find_ht_capability); | |
440 | ||
1da177e4 LT |
441 | /** |
442 | * pci_find_parent_resource - return resource region of parent bus of given region | |
443 | * @dev: PCI device structure contains resources to be searched | |
444 | * @res: child resource record for which parent is sought | |
445 | * | |
446 | * For given resource region of given device, return the resource | |
f44116ae | 447 | * region of parent bus the given region is contained in. |
1da177e4 | 448 | */ |
3c78bc61 RD |
449 | struct resource *pci_find_parent_resource(const struct pci_dev *dev, |
450 | struct resource *res) | |
1da177e4 LT |
451 | { |
452 | const struct pci_bus *bus = dev->bus; | |
f44116ae | 453 | struct resource *r; |
1da177e4 | 454 | int i; |
1da177e4 | 455 | |
89a74ecc | 456 | pci_bus_for_each_resource(bus, r, i) { |
1da177e4 LT |
457 | if (!r) |
458 | continue; | |
f44116ae BH |
459 | if (res->start && resource_contains(r, res)) { |
460 | ||
461 | /* | |
462 | * If the window is prefetchable but the BAR is | |
463 | * not, the allocator made a mistake. | |
464 | */ | |
465 | if (r->flags & IORESOURCE_PREFETCH && | |
466 | !(res->flags & IORESOURCE_PREFETCH)) | |
467 | return NULL; | |
468 | ||
469 | /* | |
470 | * If we're below a transparent bridge, there may | |
471 | * be both a positively-decoded aperture and a | |
472 | * subtractively-decoded region that contain the BAR. | |
473 | * We want the positively-decoded one, so this depends | |
474 | * on pci_bus_for_each_resource() giving us those | |
475 | * first. | |
476 | */ | |
477 | return r; | |
478 | } | |
1da177e4 | 479 | } |
f44116ae | 480 | return NULL; |
1da177e4 | 481 | } |
b7fe9434 | 482 | EXPORT_SYMBOL(pci_find_parent_resource); |
1da177e4 | 483 | |
afd29f90 MW |
484 | /** |
485 | * pci_find_resource - Return matching PCI device resource | |
486 | * @dev: PCI device to query | |
487 | * @res: Resource to look for | |
488 | * | |
489 | * Goes over standard PCI resources (BARs) and checks if the given resource | |
490 | * is partially or fully contained in any of them. In that case the | |
491 | * matching resource is returned, %NULL otherwise. | |
492 | */ | |
493 | struct resource *pci_find_resource(struct pci_dev *dev, struct resource *res) | |
494 | { | |
495 | int i; | |
496 | ||
497 | for (i = 0; i < PCI_ROM_RESOURCE; i++) { | |
498 | struct resource *r = &dev->resource[i]; | |
499 | ||
500 | if (r->start && resource_contains(r, res)) | |
501 | return r; | |
502 | } | |
503 | ||
504 | return NULL; | |
505 | } | |
506 | EXPORT_SYMBOL(pci_find_resource); | |
507 | ||
c56d4450 HS |
508 | /** |
509 | * pci_find_pcie_root_port - return PCIe Root Port | |
510 | * @dev: PCI device to query | |
511 | * | |
512 | * Traverse up the parent chain and return the PCIe Root Port PCI Device | |
513 | * for a given PCI Device. | |
514 | */ | |
515 | struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev) | |
516 | { | |
517 | struct pci_dev *bridge, *highest_pcie_bridge = NULL; | |
518 | ||
519 | bridge = pci_upstream_bridge(dev); | |
520 | while (bridge && pci_is_pcie(bridge)) { | |
521 | highest_pcie_bridge = bridge; | |
522 | bridge = pci_upstream_bridge(bridge); | |
523 | } | |
524 | ||
525 | if (pci_pcie_type(highest_pcie_bridge) != PCI_EXP_TYPE_ROOT_PORT) | |
526 | return NULL; | |
527 | ||
528 | return highest_pcie_bridge; | |
529 | } | |
530 | EXPORT_SYMBOL(pci_find_pcie_root_port); | |
531 | ||
157e876f AW |
532 | /** |
533 | * pci_wait_for_pending - wait for @mask bit(s) to clear in status word @pos | |
534 | * @dev: the PCI device to operate on | |
535 | * @pos: config space offset of status word | |
536 | * @mask: mask of bit(s) to care about in status word | |
537 | * | |
538 | * Return 1 when mask bit(s) in status word clear, 0 otherwise. | |
539 | */ | |
540 | int pci_wait_for_pending(struct pci_dev *dev, int pos, u16 mask) | |
541 | { | |
542 | int i; | |
543 | ||
544 | /* Wait for Transaction Pending bit clean */ | |
545 | for (i = 0; i < 4; i++) { | |
546 | u16 status; | |
547 | if (i) | |
548 | msleep((1 << (i - 1)) * 100); | |
549 | ||
550 | pci_read_config_word(dev, pos, &status); | |
551 | if (!(status & mask)) | |
552 | return 1; | |
553 | } | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
064b53db | 558 | /** |
70675e0b | 559 | * pci_restore_bars - restore a device's BAR values (e.g. after wake-up) |
064b53db JL |
560 | * @dev: PCI device to have its BARs restored |
561 | * | |
562 | * Restore the BAR values for a given device, so as to make it | |
563 | * accessible by its driver. | |
564 | */ | |
3c78bc61 | 565 | static void pci_restore_bars(struct pci_dev *dev) |
064b53db | 566 | { |
bc5f5a82 | 567 | int i; |
064b53db | 568 | |
bc5f5a82 | 569 | for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) |
14add80b | 570 | pci_update_resource(dev, i); |
064b53db JL |
571 | } |
572 | ||
299f2ffe | 573 | static const struct pci_platform_pm_ops *pci_platform_pm; |
961d9120 | 574 | |
299f2ffe | 575 | int pci_set_platform_pm(const struct pci_platform_pm_ops *ops) |
961d9120 | 576 | { |
cc7cc02b LW |
577 | if (!ops->is_manageable || !ops->set_state || !ops->get_state || |
578 | !ops->choose_state || !ops->sleep_wake || !ops->run_wake || | |
579 | !ops->need_resume) | |
961d9120 RW |
580 | return -EINVAL; |
581 | pci_platform_pm = ops; | |
582 | return 0; | |
583 | } | |
584 | ||
585 | static inline bool platform_pci_power_manageable(struct pci_dev *dev) | |
586 | { | |
587 | return pci_platform_pm ? pci_platform_pm->is_manageable(dev) : false; | |
588 | } | |
589 | ||
590 | static inline int platform_pci_set_power_state(struct pci_dev *dev, | |
3c78bc61 | 591 | pci_power_t t) |
961d9120 RW |
592 | { |
593 | return pci_platform_pm ? pci_platform_pm->set_state(dev, t) : -ENOSYS; | |
594 | } | |
595 | ||
cc7cc02b LW |
596 | static inline pci_power_t platform_pci_get_power_state(struct pci_dev *dev) |
597 | { | |
598 | return pci_platform_pm ? pci_platform_pm->get_state(dev) : PCI_UNKNOWN; | |
599 | } | |
600 | ||
961d9120 RW |
601 | static inline pci_power_t platform_pci_choose_state(struct pci_dev *dev) |
602 | { | |
603 | return pci_platform_pm ? | |
604 | pci_platform_pm->choose_state(dev) : PCI_POWER_ERROR; | |
605 | } | |
8f7020d3 | 606 | |
eb9d0fe4 RW |
607 | static inline int platform_pci_sleep_wake(struct pci_dev *dev, bool enable) |
608 | { | |
609 | return pci_platform_pm ? | |
610 | pci_platform_pm->sleep_wake(dev, enable) : -ENODEV; | |
611 | } | |
612 | ||
b67ea761 RW |
613 | static inline int platform_pci_run_wake(struct pci_dev *dev, bool enable) |
614 | { | |
615 | return pci_platform_pm ? | |
616 | pci_platform_pm->run_wake(dev, enable) : -ENODEV; | |
617 | } | |
618 | ||
bac2a909 RW |
619 | static inline bool platform_pci_need_resume(struct pci_dev *dev) |
620 | { | |
621 | return pci_platform_pm ? pci_platform_pm->need_resume(dev) : false; | |
622 | } | |
623 | ||
1da177e4 | 624 | /** |
44e4e66e RW |
625 | * pci_raw_set_power_state - Use PCI PM registers to set the power state of |
626 | * given PCI device | |
627 | * @dev: PCI device to handle. | |
44e4e66e | 628 | * @state: PCI power state (D0, D1, D2, D3hot) to put the device into. |
1da177e4 | 629 | * |
44e4e66e RW |
630 | * RETURN VALUE: |
631 | * -EINVAL if the requested state is invalid. | |
632 | * -EIO if device does not support PCI PM or its PM capabilities register has a | |
633 | * wrong version, or device doesn't support the requested state. | |
634 | * 0 if device already is in the requested state. | |
635 | * 0 if device's power state has been successfully changed. | |
1da177e4 | 636 | */ |
f00a20ef | 637 | static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state) |
1da177e4 | 638 | { |
337001b6 | 639 | u16 pmcsr; |
44e4e66e | 640 | bool need_restore = false; |
1da177e4 | 641 | |
4a865905 RW |
642 | /* Check if we're already there */ |
643 | if (dev->current_state == state) | |
644 | return 0; | |
645 | ||
337001b6 | 646 | if (!dev->pm_cap) |
cca03dec AL |
647 | return -EIO; |
648 | ||
44e4e66e RW |
649 | if (state < PCI_D0 || state > PCI_D3hot) |
650 | return -EINVAL; | |
651 | ||
1da177e4 | 652 | /* Validate current state: |
f7625980 | 653 | * Can enter D0 from any state, but if we can only go deeper |
1da177e4 LT |
654 | * to sleep if we're already in a low power state |
655 | */ | |
4a865905 | 656 | if (state != PCI_D0 && dev->current_state <= PCI_D3cold |
44e4e66e | 657 | && dev->current_state > state) { |
227f0647 RD |
658 | dev_err(&dev->dev, "invalid power transition (from state %d to %d)\n", |
659 | dev->current_state, state); | |
1da177e4 | 660 | return -EINVAL; |
44e4e66e | 661 | } |
1da177e4 | 662 | |
1da177e4 | 663 | /* check if this device supports the desired state */ |
337001b6 RW |
664 | if ((state == PCI_D1 && !dev->d1_support) |
665 | || (state == PCI_D2 && !dev->d2_support)) | |
3fe9d19f | 666 | return -EIO; |
1da177e4 | 667 | |
337001b6 | 668 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
064b53db | 669 | |
32a36585 | 670 | /* If we're (effectively) in D3, force entire word to 0. |
1da177e4 LT |
671 | * This doesn't affect PME_Status, disables PME_En, and |
672 | * sets PowerState to 0. | |
673 | */ | |
32a36585 | 674 | switch (dev->current_state) { |
d3535fbb JL |
675 | case PCI_D0: |
676 | case PCI_D1: | |
677 | case PCI_D2: | |
678 | pmcsr &= ~PCI_PM_CTRL_STATE_MASK; | |
679 | pmcsr |= state; | |
680 | break; | |
f62795f1 RW |
681 | case PCI_D3hot: |
682 | case PCI_D3cold: | |
32a36585 JL |
683 | case PCI_UNKNOWN: /* Boot-up */ |
684 | if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot | |
f00a20ef | 685 | && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET)) |
44e4e66e | 686 | need_restore = true; |
32a36585 | 687 | /* Fall-through: force to D0 */ |
32a36585 | 688 | default: |
d3535fbb | 689 | pmcsr = 0; |
32a36585 | 690 | break; |
1da177e4 LT |
691 | } |
692 | ||
693 | /* enter specified state */ | |
337001b6 | 694 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); |
1da177e4 LT |
695 | |
696 | /* Mandatory power management transition delays */ | |
697 | /* see PCI PM 1.1 5.6.1 table 18 */ | |
698 | if (state == PCI_D3hot || dev->current_state == PCI_D3hot) | |
1ae861e6 | 699 | pci_dev_d3_sleep(dev); |
1da177e4 | 700 | else if (state == PCI_D2 || dev->current_state == PCI_D2) |
aa8c6c93 | 701 | udelay(PCI_PM_D2_DELAY); |
1da177e4 | 702 | |
e13cdbd7 RW |
703 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
704 | dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); | |
705 | if (dev->current_state != state && printk_ratelimit()) | |
227f0647 RD |
706 | dev_info(&dev->dev, "Refused to change power state, currently in D%d\n", |
707 | dev->current_state); | |
064b53db | 708 | |
448bd857 HY |
709 | /* |
710 | * According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT | |
064b53db JL |
711 | * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning |
712 | * from D3hot to D0 _may_ perform an internal reset, thereby | |
713 | * going to "D0 Uninitialized" rather than "D0 Initialized". | |
714 | * For example, at least some versions of the 3c905B and the | |
715 | * 3c556B exhibit this behaviour. | |
716 | * | |
717 | * At least some laptop BIOSen (e.g. the Thinkpad T21) leave | |
718 | * devices in a D3hot state at boot. Consequently, we need to | |
719 | * restore at least the BARs so that the device will be | |
720 | * accessible to its driver. | |
721 | */ | |
722 | if (need_restore) | |
723 | pci_restore_bars(dev); | |
724 | ||
f00a20ef | 725 | if (dev->bus->self) |
7d715a6c SL |
726 | pcie_aspm_pm_state_change(dev->bus->self); |
727 | ||
1da177e4 LT |
728 | return 0; |
729 | } | |
730 | ||
44e4e66e | 731 | /** |
a6a64026 | 732 | * pci_update_current_state - Read power state of given device and cache it |
44e4e66e | 733 | * @dev: PCI device to handle. |
f06fc0b6 | 734 | * @state: State to cache in case the device doesn't have the PM capability |
a6a64026 LW |
735 | * |
736 | * The power state is read from the PMCSR register, which however is | |
737 | * inaccessible in D3cold. The platform firmware is therefore queried first | |
738 | * to detect accessibility of the register. In case the platform firmware | |
739 | * reports an incorrect state or the device isn't power manageable by the | |
740 | * platform at all, we try to detect D3cold by testing accessibility of the | |
741 | * vendor ID in config space. | |
44e4e66e | 742 | */ |
73410429 | 743 | void pci_update_current_state(struct pci_dev *dev, pci_power_t state) |
44e4e66e | 744 | { |
a6a64026 LW |
745 | if (platform_pci_get_power_state(dev) == PCI_D3cold || |
746 | !pci_device_is_present(dev)) { | |
747 | dev->current_state = PCI_D3cold; | |
748 | } else if (dev->pm_cap) { | |
44e4e66e RW |
749 | u16 pmcsr; |
750 | ||
337001b6 | 751 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
44e4e66e | 752 | dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); |
f06fc0b6 RW |
753 | } else { |
754 | dev->current_state = state; | |
44e4e66e RW |
755 | } |
756 | } | |
757 | ||
db288c9c RW |
758 | /** |
759 | * pci_power_up - Put the given device into D0 forcibly | |
760 | * @dev: PCI device to power up | |
761 | */ | |
762 | void pci_power_up(struct pci_dev *dev) | |
763 | { | |
764 | if (platform_pci_power_manageable(dev)) | |
765 | platform_pci_set_power_state(dev, PCI_D0); | |
766 | ||
767 | pci_raw_set_power_state(dev, PCI_D0); | |
768 | pci_update_current_state(dev, PCI_D0); | |
769 | } | |
770 | ||
0e5dd46b RW |
771 | /** |
772 | * pci_platform_power_transition - Use platform to change device power state | |
773 | * @dev: PCI device to handle. | |
774 | * @state: State to put the device into. | |
775 | */ | |
776 | static int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state) | |
777 | { | |
778 | int error; | |
779 | ||
780 | if (platform_pci_power_manageable(dev)) { | |
781 | error = platform_pci_set_power_state(dev, state); | |
782 | if (!error) | |
783 | pci_update_current_state(dev, state); | |
769ba721 | 784 | } else |
0e5dd46b | 785 | error = -ENODEV; |
769ba721 RW |
786 | |
787 | if (error && !dev->pm_cap) /* Fall back to PCI_D0 */ | |
788 | dev->current_state = PCI_D0; | |
0e5dd46b RW |
789 | |
790 | return error; | |
791 | } | |
792 | ||
0b950f0f SH |
793 | /** |
794 | * pci_wakeup - Wake up a PCI device | |
795 | * @pci_dev: Device to handle. | |
796 | * @ign: ignored parameter | |
797 | */ | |
798 | static int pci_wakeup(struct pci_dev *pci_dev, void *ign) | |
799 | { | |
800 | pci_wakeup_event(pci_dev); | |
801 | pm_request_resume(&pci_dev->dev); | |
802 | return 0; | |
803 | } | |
804 | ||
805 | /** | |
806 | * pci_wakeup_bus - Walk given bus and wake up devices on it | |
807 | * @bus: Top bus of the subtree to walk. | |
808 | */ | |
809 | static void pci_wakeup_bus(struct pci_bus *bus) | |
810 | { | |
811 | if (bus) | |
812 | pci_walk_bus(bus, pci_wakeup, NULL); | |
813 | } | |
814 | ||
0e5dd46b RW |
815 | /** |
816 | * __pci_start_power_transition - Start power transition of a PCI device | |
817 | * @dev: PCI device to handle. | |
818 | * @state: State to put the device into. | |
819 | */ | |
820 | static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state) | |
821 | { | |
448bd857 | 822 | if (state == PCI_D0) { |
0e5dd46b | 823 | pci_platform_power_transition(dev, PCI_D0); |
448bd857 HY |
824 | /* |
825 | * Mandatory power management transition delays, see | |
826 | * PCI Express Base Specification Revision 2.0 Section | |
827 | * 6.6.1: Conventional Reset. Do not delay for | |
828 | * devices powered on/off by corresponding bridge, | |
829 | * because have already delayed for the bridge. | |
830 | */ | |
831 | if (dev->runtime_d3cold) { | |
50b2b540 AH |
832 | if (dev->d3cold_delay) |
833 | msleep(dev->d3cold_delay); | |
448bd857 HY |
834 | /* |
835 | * When powering on a bridge from D3cold, the | |
836 | * whole hierarchy may be powered on into | |
837 | * D0uninitialized state, resume them to give | |
838 | * them a chance to suspend again | |
839 | */ | |
840 | pci_wakeup_bus(dev->subordinate); | |
841 | } | |
842 | } | |
843 | } | |
844 | ||
845 | /** | |
846 | * __pci_dev_set_current_state - Set current state of a PCI device | |
847 | * @dev: Device to handle | |
848 | * @data: pointer to state to be set | |
849 | */ | |
850 | static int __pci_dev_set_current_state(struct pci_dev *dev, void *data) | |
851 | { | |
852 | pci_power_t state = *(pci_power_t *)data; | |
853 | ||
854 | dev->current_state = state; | |
855 | return 0; | |
856 | } | |
857 | ||
858 | /** | |
859 | * __pci_bus_set_current_state - Walk given bus and set current state of devices | |
860 | * @bus: Top bus of the subtree to walk. | |
861 | * @state: state to be set | |
862 | */ | |
863 | static void __pci_bus_set_current_state(struct pci_bus *bus, pci_power_t state) | |
864 | { | |
865 | if (bus) | |
866 | pci_walk_bus(bus, __pci_dev_set_current_state, &state); | |
0e5dd46b RW |
867 | } |
868 | ||
869 | /** | |
870 | * __pci_complete_power_transition - Complete power transition of a PCI device | |
871 | * @dev: PCI device to handle. | |
872 | * @state: State to put the device into. | |
873 | * | |
874 | * This function should not be called directly by device drivers. | |
875 | */ | |
876 | int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state) | |
877 | { | |
448bd857 HY |
878 | int ret; |
879 | ||
db288c9c | 880 | if (state <= PCI_D0) |
448bd857 HY |
881 | return -EINVAL; |
882 | ret = pci_platform_power_transition(dev, state); | |
883 | /* Power off the bridge may power off the whole hierarchy */ | |
884 | if (!ret && state == PCI_D3cold) | |
885 | __pci_bus_set_current_state(dev->subordinate, PCI_D3cold); | |
886 | return ret; | |
0e5dd46b RW |
887 | } |
888 | EXPORT_SYMBOL_GPL(__pci_complete_power_transition); | |
889 | ||
44e4e66e RW |
890 | /** |
891 | * pci_set_power_state - Set the power state of a PCI device | |
892 | * @dev: PCI device to handle. | |
893 | * @state: PCI power state (D0, D1, D2, D3hot) to put the device into. | |
894 | * | |
877d0310 | 895 | * Transition a device to a new power state, using the platform firmware and/or |
44e4e66e RW |
896 | * the device's PCI PM registers. |
897 | * | |
898 | * RETURN VALUE: | |
899 | * -EINVAL if the requested state is invalid. | |
900 | * -EIO if device does not support PCI PM or its PM capabilities register has a | |
901 | * wrong version, or device doesn't support the requested state. | |
902 | * 0 if device already is in the requested state. | |
903 | * 0 if device's power state has been successfully changed. | |
904 | */ | |
905 | int pci_set_power_state(struct pci_dev *dev, pci_power_t state) | |
906 | { | |
337001b6 | 907 | int error; |
44e4e66e RW |
908 | |
909 | /* bound the state we're entering */ | |
448bd857 HY |
910 | if (state > PCI_D3cold) |
911 | state = PCI_D3cold; | |
44e4e66e RW |
912 | else if (state < PCI_D0) |
913 | state = PCI_D0; | |
914 | else if ((state == PCI_D1 || state == PCI_D2) && pci_no_d1d2(dev)) | |
915 | /* | |
916 | * If the device or the parent bridge do not support PCI PM, | |
917 | * ignore the request if we're doing anything other than putting | |
918 | * it into D0 (which would only happen on boot). | |
919 | */ | |
920 | return 0; | |
921 | ||
db288c9c RW |
922 | /* Check if we're already there */ |
923 | if (dev->current_state == state) | |
924 | return 0; | |
925 | ||
0e5dd46b RW |
926 | __pci_start_power_transition(dev, state); |
927 | ||
979b1791 AC |
928 | /* This device is quirked not to be put into D3, so |
929 | don't put it in D3 */ | |
448bd857 | 930 | if (state >= PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3)) |
979b1791 | 931 | return 0; |
44e4e66e | 932 | |
448bd857 HY |
933 | /* |
934 | * To put device in D3cold, we put device into D3hot in native | |
935 | * way, then put device into D3cold with platform ops | |
936 | */ | |
937 | error = pci_raw_set_power_state(dev, state > PCI_D3hot ? | |
938 | PCI_D3hot : state); | |
44e4e66e | 939 | |
0e5dd46b RW |
940 | if (!__pci_complete_power_transition(dev, state)) |
941 | error = 0; | |
44e4e66e RW |
942 | |
943 | return error; | |
944 | } | |
b7fe9434 | 945 | EXPORT_SYMBOL(pci_set_power_state); |
44e4e66e | 946 | |
1da177e4 LT |
947 | /** |
948 | * pci_choose_state - Choose the power state of a PCI device | |
949 | * @dev: PCI device to be suspended | |
950 | * @state: target sleep state for the whole system. This is the value | |
951 | * that is passed to suspend() function. | |
952 | * | |
953 | * Returns PCI power state suitable for given device and given system | |
954 | * message. | |
955 | */ | |
956 | ||
957 | pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state) | |
958 | { | |
ab826ca4 | 959 | pci_power_t ret; |
0f64474b | 960 | |
728cdb75 | 961 | if (!dev->pm_cap) |
1da177e4 LT |
962 | return PCI_D0; |
963 | ||
961d9120 RW |
964 | ret = platform_pci_choose_state(dev); |
965 | if (ret != PCI_POWER_ERROR) | |
966 | return ret; | |
ca078bae PM |
967 | |
968 | switch (state.event) { | |
969 | case PM_EVENT_ON: | |
970 | return PCI_D0; | |
971 | case PM_EVENT_FREEZE: | |
b887d2e6 DB |
972 | case PM_EVENT_PRETHAW: |
973 | /* REVISIT both freeze and pre-thaw "should" use D0 */ | |
ca078bae | 974 | case PM_EVENT_SUSPEND: |
3a2d5b70 | 975 | case PM_EVENT_HIBERNATE: |
ca078bae | 976 | return PCI_D3hot; |
1da177e4 | 977 | default: |
80ccba11 BH |
978 | dev_info(&dev->dev, "unrecognized suspend event %d\n", |
979 | state.event); | |
1da177e4 LT |
980 | BUG(); |
981 | } | |
982 | return PCI_D0; | |
983 | } | |
1da177e4 LT |
984 | EXPORT_SYMBOL(pci_choose_state); |
985 | ||
89858517 YZ |
986 | #define PCI_EXP_SAVE_REGS 7 |
987 | ||
fd0f7f73 AW |
988 | static struct pci_cap_saved_state *_pci_find_saved_cap(struct pci_dev *pci_dev, |
989 | u16 cap, bool extended) | |
34a4876e YL |
990 | { |
991 | struct pci_cap_saved_state *tmp; | |
34a4876e | 992 | |
b67bfe0d | 993 | hlist_for_each_entry(tmp, &pci_dev->saved_cap_space, next) { |
fd0f7f73 | 994 | if (tmp->cap.cap_extended == extended && tmp->cap.cap_nr == cap) |
34a4876e YL |
995 | return tmp; |
996 | } | |
997 | return NULL; | |
998 | } | |
999 | ||
fd0f7f73 AW |
1000 | struct pci_cap_saved_state *pci_find_saved_cap(struct pci_dev *dev, char cap) |
1001 | { | |
1002 | return _pci_find_saved_cap(dev, cap, false); | |
1003 | } | |
1004 | ||
1005 | struct pci_cap_saved_state *pci_find_saved_ext_cap(struct pci_dev *dev, u16 cap) | |
1006 | { | |
1007 | return _pci_find_saved_cap(dev, cap, true); | |
1008 | } | |
1009 | ||
b56a5a23 MT |
1010 | static int pci_save_pcie_state(struct pci_dev *dev) |
1011 | { | |
59875ae4 | 1012 | int i = 0; |
b56a5a23 MT |
1013 | struct pci_cap_saved_state *save_state; |
1014 | u16 *cap; | |
1015 | ||
59875ae4 | 1016 | if (!pci_is_pcie(dev)) |
b56a5a23 MT |
1017 | return 0; |
1018 | ||
9f35575d | 1019 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP); |
b56a5a23 | 1020 | if (!save_state) { |
e496b617 | 1021 | dev_err(&dev->dev, "buffer not found in %s\n", __func__); |
b56a5a23 MT |
1022 | return -ENOMEM; |
1023 | } | |
63f4898a | 1024 | |
59875ae4 JL |
1025 | cap = (u16 *)&save_state->cap.data[0]; |
1026 | pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &cap[i++]); | |
1027 | pcie_capability_read_word(dev, PCI_EXP_LNKCTL, &cap[i++]); | |
1028 | pcie_capability_read_word(dev, PCI_EXP_SLTCTL, &cap[i++]); | |
1029 | pcie_capability_read_word(dev, PCI_EXP_RTCTL, &cap[i++]); | |
1030 | pcie_capability_read_word(dev, PCI_EXP_DEVCTL2, &cap[i++]); | |
1031 | pcie_capability_read_word(dev, PCI_EXP_LNKCTL2, &cap[i++]); | |
1032 | pcie_capability_read_word(dev, PCI_EXP_SLTCTL2, &cap[i++]); | |
9cb604ed | 1033 | |
b56a5a23 MT |
1034 | return 0; |
1035 | } | |
1036 | ||
1037 | static void pci_restore_pcie_state(struct pci_dev *dev) | |
1038 | { | |
59875ae4 | 1039 | int i = 0; |
b56a5a23 MT |
1040 | struct pci_cap_saved_state *save_state; |
1041 | u16 *cap; | |
1042 | ||
1043 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP); | |
59875ae4 | 1044 | if (!save_state) |
9cb604ed MS |
1045 | return; |
1046 | ||
59875ae4 JL |
1047 | cap = (u16 *)&save_state->cap.data[0]; |
1048 | pcie_capability_write_word(dev, PCI_EXP_DEVCTL, cap[i++]); | |
1049 | pcie_capability_write_word(dev, PCI_EXP_LNKCTL, cap[i++]); | |
1050 | pcie_capability_write_word(dev, PCI_EXP_SLTCTL, cap[i++]); | |
1051 | pcie_capability_write_word(dev, PCI_EXP_RTCTL, cap[i++]); | |
1052 | pcie_capability_write_word(dev, PCI_EXP_DEVCTL2, cap[i++]); | |
1053 | pcie_capability_write_word(dev, PCI_EXP_LNKCTL2, cap[i++]); | |
1054 | pcie_capability_write_word(dev, PCI_EXP_SLTCTL2, cap[i++]); | |
b56a5a23 MT |
1055 | } |
1056 | ||
cc692a5f SH |
1057 | |
1058 | static int pci_save_pcix_state(struct pci_dev *dev) | |
1059 | { | |
63f4898a | 1060 | int pos; |
cc692a5f | 1061 | struct pci_cap_saved_state *save_state; |
cc692a5f SH |
1062 | |
1063 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
0a1a9b49 | 1064 | if (!pos) |
cc692a5f SH |
1065 | return 0; |
1066 | ||
f34303de | 1067 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX); |
cc692a5f | 1068 | if (!save_state) { |
e496b617 | 1069 | dev_err(&dev->dev, "buffer not found in %s\n", __func__); |
cc692a5f SH |
1070 | return -ENOMEM; |
1071 | } | |
cc692a5f | 1072 | |
24a4742f AW |
1073 | pci_read_config_word(dev, pos + PCI_X_CMD, |
1074 | (u16 *)save_state->cap.data); | |
63f4898a | 1075 | |
cc692a5f SH |
1076 | return 0; |
1077 | } | |
1078 | ||
1079 | static void pci_restore_pcix_state(struct pci_dev *dev) | |
1080 | { | |
1081 | int i = 0, pos; | |
1082 | struct pci_cap_saved_state *save_state; | |
1083 | u16 *cap; | |
1084 | ||
1085 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX); | |
1086 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
0a1a9b49 | 1087 | if (!save_state || !pos) |
cc692a5f | 1088 | return; |
24a4742f | 1089 | cap = (u16 *)&save_state->cap.data[0]; |
cc692a5f SH |
1090 | |
1091 | pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]); | |
cc692a5f SH |
1092 | } |
1093 | ||
1094 | ||
1da177e4 LT |
1095 | /** |
1096 | * pci_save_state - save the PCI configuration space of a device before suspending | |
1097 | * @dev: - PCI device that we're dealing with | |
1da177e4 | 1098 | */ |
3c78bc61 | 1099 | int pci_save_state(struct pci_dev *dev) |
1da177e4 LT |
1100 | { |
1101 | int i; | |
1102 | /* XXX: 100% dword access ok here? */ | |
1103 | for (i = 0; i < 16; i++) | |
9e0b5b2c | 1104 | pci_read_config_dword(dev, i * 4, &dev->saved_config_space[i]); |
aa8c6c93 | 1105 | dev->state_saved = true; |
79e50e72 QL |
1106 | |
1107 | i = pci_save_pcie_state(dev); | |
1108 | if (i != 0) | |
b56a5a23 | 1109 | return i; |
79e50e72 QL |
1110 | |
1111 | i = pci_save_pcix_state(dev); | |
1112 | if (i != 0) | |
cc692a5f | 1113 | return i; |
79e50e72 | 1114 | |
754834b9 | 1115 | return pci_save_vc_state(dev); |
1da177e4 | 1116 | } |
b7fe9434 | 1117 | EXPORT_SYMBOL(pci_save_state); |
1da177e4 | 1118 | |
ebfc5b80 RW |
1119 | static void pci_restore_config_dword(struct pci_dev *pdev, int offset, |
1120 | u32 saved_val, int retry) | |
1121 | { | |
1122 | u32 val; | |
1123 | ||
1124 | pci_read_config_dword(pdev, offset, &val); | |
1125 | if (val == saved_val) | |
1126 | return; | |
1127 | ||
1128 | for (;;) { | |
227f0647 RD |
1129 | dev_dbg(&pdev->dev, "restoring config space at offset %#x (was %#x, writing %#x)\n", |
1130 | offset, val, saved_val); | |
ebfc5b80 RW |
1131 | pci_write_config_dword(pdev, offset, saved_val); |
1132 | if (retry-- <= 0) | |
1133 | return; | |
1134 | ||
1135 | pci_read_config_dword(pdev, offset, &val); | |
1136 | if (val == saved_val) | |
1137 | return; | |
1138 | ||
1139 | mdelay(1); | |
1140 | } | |
1141 | } | |
1142 | ||
a6cb9ee7 RW |
1143 | static void pci_restore_config_space_range(struct pci_dev *pdev, |
1144 | int start, int end, int retry) | |
ebfc5b80 RW |
1145 | { |
1146 | int index; | |
1147 | ||
1148 | for (index = end; index >= start; index--) | |
1149 | pci_restore_config_dword(pdev, 4 * index, | |
1150 | pdev->saved_config_space[index], | |
1151 | retry); | |
1152 | } | |
1153 | ||
a6cb9ee7 RW |
1154 | static void pci_restore_config_space(struct pci_dev *pdev) |
1155 | { | |
1156 | if (pdev->hdr_type == PCI_HEADER_TYPE_NORMAL) { | |
1157 | pci_restore_config_space_range(pdev, 10, 15, 0); | |
1158 | /* Restore BARs before the command register. */ | |
1159 | pci_restore_config_space_range(pdev, 4, 9, 10); | |
1160 | pci_restore_config_space_range(pdev, 0, 3, 0); | |
1161 | } else { | |
1162 | pci_restore_config_space_range(pdev, 0, 15, 0); | |
1163 | } | |
1164 | } | |
1165 | ||
f7625980 | 1166 | /** |
1da177e4 LT |
1167 | * pci_restore_state - Restore the saved state of a PCI device |
1168 | * @dev: - PCI device that we're dealing with | |
1da177e4 | 1169 | */ |
1d3c16a8 | 1170 | void pci_restore_state(struct pci_dev *dev) |
1da177e4 | 1171 | { |
c82f63e4 | 1172 | if (!dev->state_saved) |
1d3c16a8 | 1173 | return; |
4b77b0a2 | 1174 | |
b56a5a23 MT |
1175 | /* PCI Express register must be restored first */ |
1176 | pci_restore_pcie_state(dev); | |
4ebeb1ec CT |
1177 | pci_restore_pasid_state(dev); |
1178 | pci_restore_pri_state(dev); | |
1900ca13 | 1179 | pci_restore_ats_state(dev); |
425c1b22 | 1180 | pci_restore_vc_state(dev); |
b56a5a23 | 1181 | |
b07461a8 TI |
1182 | pci_cleanup_aer_error_status_regs(dev); |
1183 | ||
a6cb9ee7 | 1184 | pci_restore_config_space(dev); |
ebfc5b80 | 1185 | |
cc692a5f | 1186 | pci_restore_pcix_state(dev); |
41017f0c | 1187 | pci_restore_msi_state(dev); |
ccbc175a AD |
1188 | |
1189 | /* Restore ACS and IOV configuration state */ | |
1190 | pci_enable_acs(dev); | |
8c5cdb6a | 1191 | pci_restore_iov_state(dev); |
8fed4b65 | 1192 | |
4b77b0a2 | 1193 | dev->state_saved = false; |
1da177e4 | 1194 | } |
b7fe9434 | 1195 | EXPORT_SYMBOL(pci_restore_state); |
1da177e4 | 1196 | |
ffbdd3f7 AW |
1197 | struct pci_saved_state { |
1198 | u32 config_space[16]; | |
1199 | struct pci_cap_saved_data cap[0]; | |
1200 | }; | |
1201 | ||
1202 | /** | |
1203 | * pci_store_saved_state - Allocate and return an opaque struct containing | |
1204 | * the device saved state. | |
1205 | * @dev: PCI device that we're dealing with | |
1206 | * | |
f7625980 | 1207 | * Return NULL if no state or error. |
ffbdd3f7 AW |
1208 | */ |
1209 | struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev) | |
1210 | { | |
1211 | struct pci_saved_state *state; | |
1212 | struct pci_cap_saved_state *tmp; | |
1213 | struct pci_cap_saved_data *cap; | |
ffbdd3f7 AW |
1214 | size_t size; |
1215 | ||
1216 | if (!dev->state_saved) | |
1217 | return NULL; | |
1218 | ||
1219 | size = sizeof(*state) + sizeof(struct pci_cap_saved_data); | |
1220 | ||
b67bfe0d | 1221 | hlist_for_each_entry(tmp, &dev->saved_cap_space, next) |
ffbdd3f7 AW |
1222 | size += sizeof(struct pci_cap_saved_data) + tmp->cap.size; |
1223 | ||
1224 | state = kzalloc(size, GFP_KERNEL); | |
1225 | if (!state) | |
1226 | return NULL; | |
1227 | ||
1228 | memcpy(state->config_space, dev->saved_config_space, | |
1229 | sizeof(state->config_space)); | |
1230 | ||
1231 | cap = state->cap; | |
b67bfe0d | 1232 | hlist_for_each_entry(tmp, &dev->saved_cap_space, next) { |
ffbdd3f7 AW |
1233 | size_t len = sizeof(struct pci_cap_saved_data) + tmp->cap.size; |
1234 | memcpy(cap, &tmp->cap, len); | |
1235 | cap = (struct pci_cap_saved_data *)((u8 *)cap + len); | |
1236 | } | |
1237 | /* Empty cap_save terminates list */ | |
1238 | ||
1239 | return state; | |
1240 | } | |
1241 | EXPORT_SYMBOL_GPL(pci_store_saved_state); | |
1242 | ||
1243 | /** | |
1244 | * pci_load_saved_state - Reload the provided save state into struct pci_dev. | |
1245 | * @dev: PCI device that we're dealing with | |
1246 | * @state: Saved state returned from pci_store_saved_state() | |
1247 | */ | |
98d9b271 KRW |
1248 | int pci_load_saved_state(struct pci_dev *dev, |
1249 | struct pci_saved_state *state) | |
ffbdd3f7 AW |
1250 | { |
1251 | struct pci_cap_saved_data *cap; | |
1252 | ||
1253 | dev->state_saved = false; | |
1254 | ||
1255 | if (!state) | |
1256 | return 0; | |
1257 | ||
1258 | memcpy(dev->saved_config_space, state->config_space, | |
1259 | sizeof(state->config_space)); | |
1260 | ||
1261 | cap = state->cap; | |
1262 | while (cap->size) { | |
1263 | struct pci_cap_saved_state *tmp; | |
1264 | ||
fd0f7f73 | 1265 | tmp = _pci_find_saved_cap(dev, cap->cap_nr, cap->cap_extended); |
ffbdd3f7 AW |
1266 | if (!tmp || tmp->cap.size != cap->size) |
1267 | return -EINVAL; | |
1268 | ||
1269 | memcpy(tmp->cap.data, cap->data, tmp->cap.size); | |
1270 | cap = (struct pci_cap_saved_data *)((u8 *)cap + | |
1271 | sizeof(struct pci_cap_saved_data) + cap->size); | |
1272 | } | |
1273 | ||
1274 | dev->state_saved = true; | |
1275 | return 0; | |
1276 | } | |
98d9b271 | 1277 | EXPORT_SYMBOL_GPL(pci_load_saved_state); |
ffbdd3f7 AW |
1278 | |
1279 | /** | |
1280 | * pci_load_and_free_saved_state - Reload the save state pointed to by state, | |
1281 | * and free the memory allocated for it. | |
1282 | * @dev: PCI device that we're dealing with | |
1283 | * @state: Pointer to saved state returned from pci_store_saved_state() | |
1284 | */ | |
1285 | int pci_load_and_free_saved_state(struct pci_dev *dev, | |
1286 | struct pci_saved_state **state) | |
1287 | { | |
1288 | int ret = pci_load_saved_state(dev, *state); | |
1289 | kfree(*state); | |
1290 | *state = NULL; | |
1291 | return ret; | |
1292 | } | |
1293 | EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state); | |
1294 | ||
8a9d5609 BH |
1295 | int __weak pcibios_enable_device(struct pci_dev *dev, int bars) |
1296 | { | |
1297 | return pci_enable_resources(dev, bars); | |
1298 | } | |
1299 | ||
38cc1302 HS |
1300 | static int do_pci_enable_device(struct pci_dev *dev, int bars) |
1301 | { | |
1302 | int err; | |
1f6ae47e | 1303 | struct pci_dev *bridge; |
1e2571a7 BH |
1304 | u16 cmd; |
1305 | u8 pin; | |
38cc1302 HS |
1306 | |
1307 | err = pci_set_power_state(dev, PCI_D0); | |
1308 | if (err < 0 && err != -EIO) | |
1309 | return err; | |
1f6ae47e VS |
1310 | |
1311 | bridge = pci_upstream_bridge(dev); | |
1312 | if (bridge) | |
1313 | pcie_aspm_powersave_config_link(bridge); | |
1314 | ||
38cc1302 HS |
1315 | err = pcibios_enable_device(dev, bars); |
1316 | if (err < 0) | |
1317 | return err; | |
1318 | pci_fixup_device(pci_fixup_enable, dev); | |
1319 | ||
866d5417 BH |
1320 | if (dev->msi_enabled || dev->msix_enabled) |
1321 | return 0; | |
1322 | ||
1e2571a7 BH |
1323 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); |
1324 | if (pin) { | |
1325 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
1326 | if (cmd & PCI_COMMAND_INTX_DISABLE) | |
1327 | pci_write_config_word(dev, PCI_COMMAND, | |
1328 | cmd & ~PCI_COMMAND_INTX_DISABLE); | |
1329 | } | |
1330 | ||
38cc1302 HS |
1331 | return 0; |
1332 | } | |
1333 | ||
1334 | /** | |
0b62e13b | 1335 | * pci_reenable_device - Resume abandoned device |
38cc1302 HS |
1336 | * @dev: PCI device to be resumed |
1337 | * | |
1338 | * Note this function is a backend of pci_default_resume and is not supposed | |
1339 | * to be called by normal code, write proper resume handler and use it instead. | |
1340 | */ | |
0b62e13b | 1341 | int pci_reenable_device(struct pci_dev *dev) |
38cc1302 | 1342 | { |
296ccb08 | 1343 | if (pci_is_enabled(dev)) |
38cc1302 HS |
1344 | return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1); |
1345 | return 0; | |
1346 | } | |
b7fe9434 | 1347 | EXPORT_SYMBOL(pci_reenable_device); |
38cc1302 | 1348 | |
928bea96 YL |
1349 | static void pci_enable_bridge(struct pci_dev *dev) |
1350 | { | |
79272138 | 1351 | struct pci_dev *bridge; |
928bea96 YL |
1352 | int retval; |
1353 | ||
79272138 BH |
1354 | bridge = pci_upstream_bridge(dev); |
1355 | if (bridge) | |
1356 | pci_enable_bridge(bridge); | |
928bea96 | 1357 | |
cf3e1feb | 1358 | if (pci_is_enabled(dev)) { |
fbeeb822 | 1359 | if (!dev->is_busmaster) |
cf3e1feb | 1360 | pci_set_master(dev); |
928bea96 | 1361 | return; |
cf3e1feb YL |
1362 | } |
1363 | ||
928bea96 YL |
1364 | retval = pci_enable_device(dev); |
1365 | if (retval) | |
1366 | dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", | |
1367 | retval); | |
1368 | pci_set_master(dev); | |
1369 | } | |
1370 | ||
b4b4fbba | 1371 | static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags) |
1da177e4 | 1372 | { |
79272138 | 1373 | struct pci_dev *bridge; |
1da177e4 | 1374 | int err; |
b718989d | 1375 | int i, bars = 0; |
1da177e4 | 1376 | |
97c145f7 JB |
1377 | /* |
1378 | * Power state could be unknown at this point, either due to a fresh | |
1379 | * boot or a device removal call. So get the current power state | |
1380 | * so that things like MSI message writing will behave as expected | |
1381 | * (e.g. if the device really is in D0 at enable time). | |
1382 | */ | |
1383 | if (dev->pm_cap) { | |
1384 | u16 pmcsr; | |
1385 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); | |
1386 | dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); | |
1387 | } | |
1388 | ||
cc7ba39b | 1389 | if (atomic_inc_return(&dev->enable_cnt) > 1) |
9fb625c3 HS |
1390 | return 0; /* already enabled */ |
1391 | ||
79272138 BH |
1392 | bridge = pci_upstream_bridge(dev); |
1393 | if (bridge) | |
1394 | pci_enable_bridge(bridge); | |
928bea96 | 1395 | |
497f16f2 YL |
1396 | /* only skip sriov related */ |
1397 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) | |
1398 | if (dev->resource[i].flags & flags) | |
1399 | bars |= (1 << i); | |
1400 | for (i = PCI_BRIDGE_RESOURCES; i < DEVICE_COUNT_RESOURCE; i++) | |
b718989d BH |
1401 | if (dev->resource[i].flags & flags) |
1402 | bars |= (1 << i); | |
1403 | ||
38cc1302 | 1404 | err = do_pci_enable_device(dev, bars); |
95a62965 | 1405 | if (err < 0) |
38cc1302 | 1406 | atomic_dec(&dev->enable_cnt); |
9fb625c3 | 1407 | return err; |
1da177e4 LT |
1408 | } |
1409 | ||
b718989d BH |
1410 | /** |
1411 | * pci_enable_device_io - Initialize a device for use with IO space | |
1412 | * @dev: PCI device to be initialized | |
1413 | * | |
1414 | * Initialize device before it's used by a driver. Ask low-level code | |
1415 | * to enable I/O resources. Wake up the device if it was suspended. | |
1416 | * Beware, this function can fail. | |
1417 | */ | |
1418 | int pci_enable_device_io(struct pci_dev *dev) | |
1419 | { | |
b4b4fbba | 1420 | return pci_enable_device_flags(dev, IORESOURCE_IO); |
b718989d | 1421 | } |
b7fe9434 | 1422 | EXPORT_SYMBOL(pci_enable_device_io); |
b718989d BH |
1423 | |
1424 | /** | |
1425 | * pci_enable_device_mem - Initialize a device for use with Memory space | |
1426 | * @dev: PCI device to be initialized | |
1427 | * | |
1428 | * Initialize device before it's used by a driver. Ask low-level code | |
1429 | * to enable Memory resources. Wake up the device if it was suspended. | |
1430 | * Beware, this function can fail. | |
1431 | */ | |
1432 | int pci_enable_device_mem(struct pci_dev *dev) | |
1433 | { | |
b4b4fbba | 1434 | return pci_enable_device_flags(dev, IORESOURCE_MEM); |
b718989d | 1435 | } |
b7fe9434 | 1436 | EXPORT_SYMBOL(pci_enable_device_mem); |
b718989d | 1437 | |
bae94d02 IPG |
1438 | /** |
1439 | * pci_enable_device - Initialize device before it's used by a driver. | |
1440 | * @dev: PCI device to be initialized | |
1441 | * | |
1442 | * Initialize device before it's used by a driver. Ask low-level code | |
1443 | * to enable I/O and memory. Wake up the device if it was suspended. | |
1444 | * Beware, this function can fail. | |
1445 | * | |
1446 | * Note we don't actually enable the device many times if we call | |
1447 | * this function repeatedly (we just increment the count). | |
1448 | */ | |
1449 | int pci_enable_device(struct pci_dev *dev) | |
1450 | { | |
b4b4fbba | 1451 | return pci_enable_device_flags(dev, IORESOURCE_MEM | IORESOURCE_IO); |
bae94d02 | 1452 | } |
b7fe9434 | 1453 | EXPORT_SYMBOL(pci_enable_device); |
bae94d02 | 1454 | |
9ac7849e TH |
1455 | /* |
1456 | * Managed PCI resources. This manages device on/off, intx/msi/msix | |
1457 | * on/off and BAR regions. pci_dev itself records msi/msix status, so | |
1458 | * there's no need to track it separately. pci_devres is initialized | |
1459 | * when a device is enabled using managed PCI device enable interface. | |
1460 | */ | |
1461 | struct pci_devres { | |
7f375f32 TH |
1462 | unsigned int enabled:1; |
1463 | unsigned int pinned:1; | |
9ac7849e TH |
1464 | unsigned int orig_intx:1; |
1465 | unsigned int restore_intx:1; | |
1466 | u32 region_mask; | |
1467 | }; | |
1468 | ||
1469 | static void pcim_release(struct device *gendev, void *res) | |
1470 | { | |
f3d2f165 | 1471 | struct pci_dev *dev = to_pci_dev(gendev); |
9ac7849e TH |
1472 | struct pci_devres *this = res; |
1473 | int i; | |
1474 | ||
1475 | if (dev->msi_enabled) | |
1476 | pci_disable_msi(dev); | |
1477 | if (dev->msix_enabled) | |
1478 | pci_disable_msix(dev); | |
1479 | ||
1480 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) | |
1481 | if (this->region_mask & (1 << i)) | |
1482 | pci_release_region(dev, i); | |
1483 | ||
1484 | if (this->restore_intx) | |
1485 | pci_intx(dev, this->orig_intx); | |
1486 | ||
7f375f32 | 1487 | if (this->enabled && !this->pinned) |
9ac7849e TH |
1488 | pci_disable_device(dev); |
1489 | } | |
1490 | ||
07656d83 | 1491 | static struct pci_devres *get_pci_dr(struct pci_dev *pdev) |
9ac7849e TH |
1492 | { |
1493 | struct pci_devres *dr, *new_dr; | |
1494 | ||
1495 | dr = devres_find(&pdev->dev, pcim_release, NULL, NULL); | |
1496 | if (dr) | |
1497 | return dr; | |
1498 | ||
1499 | new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL); | |
1500 | if (!new_dr) | |
1501 | return NULL; | |
1502 | return devres_get(&pdev->dev, new_dr, NULL, NULL); | |
1503 | } | |
1504 | ||
07656d83 | 1505 | static struct pci_devres *find_pci_dr(struct pci_dev *pdev) |
9ac7849e TH |
1506 | { |
1507 | if (pci_is_managed(pdev)) | |
1508 | return devres_find(&pdev->dev, pcim_release, NULL, NULL); | |
1509 | return NULL; | |
1510 | } | |
1511 | ||
1512 | /** | |
1513 | * pcim_enable_device - Managed pci_enable_device() | |
1514 | * @pdev: PCI device to be initialized | |
1515 | * | |
1516 | * Managed pci_enable_device(). | |
1517 | */ | |
1518 | int pcim_enable_device(struct pci_dev *pdev) | |
1519 | { | |
1520 | struct pci_devres *dr; | |
1521 | int rc; | |
1522 | ||
1523 | dr = get_pci_dr(pdev); | |
1524 | if (unlikely(!dr)) | |
1525 | return -ENOMEM; | |
b95d58ea TH |
1526 | if (dr->enabled) |
1527 | return 0; | |
9ac7849e TH |
1528 | |
1529 | rc = pci_enable_device(pdev); | |
1530 | if (!rc) { | |
1531 | pdev->is_managed = 1; | |
7f375f32 | 1532 | dr->enabled = 1; |
9ac7849e TH |
1533 | } |
1534 | return rc; | |
1535 | } | |
b7fe9434 | 1536 | EXPORT_SYMBOL(pcim_enable_device); |
9ac7849e TH |
1537 | |
1538 | /** | |
1539 | * pcim_pin_device - Pin managed PCI device | |
1540 | * @pdev: PCI device to pin | |
1541 | * | |
1542 | * Pin managed PCI device @pdev. Pinned device won't be disabled on | |
1543 | * driver detach. @pdev must have been enabled with | |
1544 | * pcim_enable_device(). | |
1545 | */ | |
1546 | void pcim_pin_device(struct pci_dev *pdev) | |
1547 | { | |
1548 | struct pci_devres *dr; | |
1549 | ||
1550 | dr = find_pci_dr(pdev); | |
7f375f32 | 1551 | WARN_ON(!dr || !dr->enabled); |
9ac7849e | 1552 | if (dr) |
7f375f32 | 1553 | dr->pinned = 1; |
9ac7849e | 1554 | } |
b7fe9434 | 1555 | EXPORT_SYMBOL(pcim_pin_device); |
9ac7849e | 1556 | |
eca0d467 MG |
1557 | /* |
1558 | * pcibios_add_device - provide arch specific hooks when adding device dev | |
1559 | * @dev: the PCI device being added | |
1560 | * | |
1561 | * Permits the platform to provide architecture specific functionality when | |
1562 | * devices are added. This is the default implementation. Architecture | |
1563 | * implementations can override this. | |
1564 | */ | |
3c78bc61 | 1565 | int __weak pcibios_add_device(struct pci_dev *dev) |
eca0d467 MG |
1566 | { |
1567 | return 0; | |
1568 | } | |
1569 | ||
6ae32c53 SO |
1570 | /** |
1571 | * pcibios_release_device - provide arch specific hooks when releasing device dev | |
1572 | * @dev: the PCI device being released | |
1573 | * | |
1574 | * Permits the platform to provide architecture specific functionality when | |
1575 | * devices are released. This is the default implementation. Architecture | |
1576 | * implementations can override this. | |
1577 | */ | |
1578 | void __weak pcibios_release_device(struct pci_dev *dev) {} | |
1579 | ||
1da177e4 LT |
1580 | /** |
1581 | * pcibios_disable_device - disable arch specific PCI resources for device dev | |
1582 | * @dev: the PCI device to disable | |
1583 | * | |
1584 | * Disables architecture specific PCI resources for the device. This | |
1585 | * is the default implementation. Architecture implementations can | |
1586 | * override this. | |
1587 | */ | |
ff3ce480 | 1588 | void __weak pcibios_disable_device(struct pci_dev *dev) {} |
1da177e4 | 1589 | |
a43ae58c HG |
1590 | /** |
1591 | * pcibios_penalize_isa_irq - penalize an ISA IRQ | |
1592 | * @irq: ISA IRQ to penalize | |
1593 | * @active: IRQ active or not | |
1594 | * | |
1595 | * Permits the platform to provide architecture-specific functionality when | |
1596 | * penalizing ISA IRQs. This is the default implementation. Architecture | |
1597 | * implementations can override this. | |
1598 | */ | |
1599 | void __weak pcibios_penalize_isa_irq(int irq, int active) {} | |
1600 | ||
fa58d305 RW |
1601 | static void do_pci_disable_device(struct pci_dev *dev) |
1602 | { | |
1603 | u16 pci_command; | |
1604 | ||
1605 | pci_read_config_word(dev, PCI_COMMAND, &pci_command); | |
1606 | if (pci_command & PCI_COMMAND_MASTER) { | |
1607 | pci_command &= ~PCI_COMMAND_MASTER; | |
1608 | pci_write_config_word(dev, PCI_COMMAND, pci_command); | |
1609 | } | |
1610 | ||
1611 | pcibios_disable_device(dev); | |
1612 | } | |
1613 | ||
1614 | /** | |
1615 | * pci_disable_enabled_device - Disable device without updating enable_cnt | |
1616 | * @dev: PCI device to disable | |
1617 | * | |
1618 | * NOTE: This function is a backend of PCI power management routines and is | |
1619 | * not supposed to be called drivers. | |
1620 | */ | |
1621 | void pci_disable_enabled_device(struct pci_dev *dev) | |
1622 | { | |
296ccb08 | 1623 | if (pci_is_enabled(dev)) |
fa58d305 RW |
1624 | do_pci_disable_device(dev); |
1625 | } | |
1626 | ||
1da177e4 LT |
1627 | /** |
1628 | * pci_disable_device - Disable PCI device after use | |
1629 | * @dev: PCI device to be disabled | |
1630 | * | |
1631 | * Signal to the system that the PCI device is not in use by the system | |
1632 | * anymore. This only involves disabling PCI bus-mastering, if active. | |
bae94d02 IPG |
1633 | * |
1634 | * Note we don't actually disable the device until all callers of | |
ee6583f6 | 1635 | * pci_enable_device() have called pci_disable_device(). |
1da177e4 | 1636 | */ |
3c78bc61 | 1637 | void pci_disable_device(struct pci_dev *dev) |
1da177e4 | 1638 | { |
9ac7849e | 1639 | struct pci_devres *dr; |
99dc804d | 1640 | |
9ac7849e TH |
1641 | dr = find_pci_dr(dev); |
1642 | if (dr) | |
7f375f32 | 1643 | dr->enabled = 0; |
9ac7849e | 1644 | |
fd6dceab KK |
1645 | dev_WARN_ONCE(&dev->dev, atomic_read(&dev->enable_cnt) <= 0, |
1646 | "disabling already-disabled device"); | |
1647 | ||
cc7ba39b | 1648 | if (atomic_dec_return(&dev->enable_cnt) != 0) |
bae94d02 IPG |
1649 | return; |
1650 | ||
fa58d305 | 1651 | do_pci_disable_device(dev); |
1da177e4 | 1652 | |
fa58d305 | 1653 | dev->is_busmaster = 0; |
1da177e4 | 1654 | } |
b7fe9434 | 1655 | EXPORT_SYMBOL(pci_disable_device); |
1da177e4 | 1656 | |
f7bdd12d BK |
1657 | /** |
1658 | * pcibios_set_pcie_reset_state - set reset state for device dev | |
45e829ea | 1659 | * @dev: the PCIe device reset |
f7bdd12d BK |
1660 | * @state: Reset state to enter into |
1661 | * | |
1662 | * | |
45e829ea | 1663 | * Sets the PCIe reset state for the device. This is the default |
f7bdd12d BK |
1664 | * implementation. Architecture implementations can override this. |
1665 | */ | |
d6d88c83 BH |
1666 | int __weak pcibios_set_pcie_reset_state(struct pci_dev *dev, |
1667 | enum pcie_reset_state state) | |
f7bdd12d BK |
1668 | { |
1669 | return -EINVAL; | |
1670 | } | |
1671 | ||
1672 | /** | |
1673 | * pci_set_pcie_reset_state - set reset state for device dev | |
45e829ea | 1674 | * @dev: the PCIe device reset |
f7bdd12d BK |
1675 | * @state: Reset state to enter into |
1676 | * | |
1677 | * | |
1678 | * Sets the PCI reset state for the device. | |
1679 | */ | |
1680 | int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state) | |
1681 | { | |
1682 | return pcibios_set_pcie_reset_state(dev, state); | |
1683 | } | |
b7fe9434 | 1684 | EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state); |
f7bdd12d | 1685 | |
58ff4633 RW |
1686 | /** |
1687 | * pci_check_pme_status - Check if given device has generated PME. | |
1688 | * @dev: Device to check. | |
1689 | * | |
1690 | * Check the PME status of the device and if set, clear it and clear PME enable | |
1691 | * (if set). Return 'true' if PME status and PME enable were both set or | |
1692 | * 'false' otherwise. | |
1693 | */ | |
1694 | bool pci_check_pme_status(struct pci_dev *dev) | |
1695 | { | |
1696 | int pmcsr_pos; | |
1697 | u16 pmcsr; | |
1698 | bool ret = false; | |
1699 | ||
1700 | if (!dev->pm_cap) | |
1701 | return false; | |
1702 | ||
1703 | pmcsr_pos = dev->pm_cap + PCI_PM_CTRL; | |
1704 | pci_read_config_word(dev, pmcsr_pos, &pmcsr); | |
1705 | if (!(pmcsr & PCI_PM_CTRL_PME_STATUS)) | |
1706 | return false; | |
1707 | ||
1708 | /* Clear PME status. */ | |
1709 | pmcsr |= PCI_PM_CTRL_PME_STATUS; | |
1710 | if (pmcsr & PCI_PM_CTRL_PME_ENABLE) { | |
1711 | /* Disable PME to avoid interrupt flood. */ | |
1712 | pmcsr &= ~PCI_PM_CTRL_PME_ENABLE; | |
1713 | ret = true; | |
1714 | } | |
1715 | ||
1716 | pci_write_config_word(dev, pmcsr_pos, pmcsr); | |
1717 | ||
1718 | return ret; | |
1719 | } | |
1720 | ||
b67ea761 RW |
1721 | /** |
1722 | * pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set. | |
1723 | * @dev: Device to handle. | |
379021d5 | 1724 | * @pme_poll_reset: Whether or not to reset the device's pme_poll flag. |
b67ea761 RW |
1725 | * |
1726 | * Check if @dev has generated PME and queue a resume request for it in that | |
1727 | * case. | |
1728 | */ | |
379021d5 | 1729 | static int pci_pme_wakeup(struct pci_dev *dev, void *pme_poll_reset) |
b67ea761 | 1730 | { |
379021d5 RW |
1731 | if (pme_poll_reset && dev->pme_poll) |
1732 | dev->pme_poll = false; | |
1733 | ||
c125e96f | 1734 | if (pci_check_pme_status(dev)) { |
c125e96f | 1735 | pci_wakeup_event(dev); |
0f953bf6 | 1736 | pm_request_resume(&dev->dev); |
c125e96f | 1737 | } |
b67ea761 RW |
1738 | return 0; |
1739 | } | |
1740 | ||
1741 | /** | |
1742 | * pci_pme_wakeup_bus - Walk given bus and wake up devices on it, if necessary. | |
1743 | * @bus: Top bus of the subtree to walk. | |
1744 | */ | |
1745 | void pci_pme_wakeup_bus(struct pci_bus *bus) | |
1746 | { | |
1747 | if (bus) | |
379021d5 | 1748 | pci_walk_bus(bus, pci_pme_wakeup, (void *)true); |
b67ea761 RW |
1749 | } |
1750 | ||
448bd857 | 1751 | |
eb9d0fe4 RW |
1752 | /** |
1753 | * pci_pme_capable - check the capability of PCI device to generate PME# | |
1754 | * @dev: PCI device to handle. | |
eb9d0fe4 RW |
1755 | * @state: PCI state from which device will issue PME#. |
1756 | */ | |
e5899e1b | 1757 | bool pci_pme_capable(struct pci_dev *dev, pci_power_t state) |
eb9d0fe4 | 1758 | { |
337001b6 | 1759 | if (!dev->pm_cap) |
eb9d0fe4 RW |
1760 | return false; |
1761 | ||
337001b6 | 1762 | return !!(dev->pme_support & (1 << state)); |
eb9d0fe4 | 1763 | } |
b7fe9434 | 1764 | EXPORT_SYMBOL(pci_pme_capable); |
eb9d0fe4 | 1765 | |
df17e62e MG |
1766 | static void pci_pme_list_scan(struct work_struct *work) |
1767 | { | |
379021d5 | 1768 | struct pci_pme_device *pme_dev, *n; |
df17e62e MG |
1769 | |
1770 | mutex_lock(&pci_pme_list_mutex); | |
ce300008 BH |
1771 | list_for_each_entry_safe(pme_dev, n, &pci_pme_list, list) { |
1772 | if (pme_dev->dev->pme_poll) { | |
1773 | struct pci_dev *bridge; | |
1774 | ||
1775 | bridge = pme_dev->dev->bus->self; | |
1776 | /* | |
1777 | * If bridge is in low power state, the | |
1778 | * configuration space of subordinate devices | |
1779 | * may be not accessible | |
1780 | */ | |
1781 | if (bridge && bridge->current_state != PCI_D0) | |
1782 | continue; | |
1783 | pci_pme_wakeup(pme_dev->dev, NULL); | |
1784 | } else { | |
1785 | list_del(&pme_dev->list); | |
1786 | kfree(pme_dev); | |
379021d5 | 1787 | } |
df17e62e | 1788 | } |
ce300008 | 1789 | if (!list_empty(&pci_pme_list)) |
ea00353f LW |
1790 | queue_delayed_work(system_freezable_wq, &pci_pme_work, |
1791 | msecs_to_jiffies(PME_TIMEOUT)); | |
df17e62e MG |
1792 | mutex_unlock(&pci_pme_list_mutex); |
1793 | } | |
1794 | ||
2cef548a | 1795 | static void __pci_pme_active(struct pci_dev *dev, bool enable) |
eb9d0fe4 RW |
1796 | { |
1797 | u16 pmcsr; | |
1798 | ||
ffaddbe8 | 1799 | if (!dev->pme_support) |
eb9d0fe4 RW |
1800 | return; |
1801 | ||
337001b6 | 1802 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
eb9d0fe4 RW |
1803 | /* Clear PME_Status by writing 1 to it and enable PME# */ |
1804 | pmcsr |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE; | |
1805 | if (!enable) | |
1806 | pmcsr &= ~PCI_PM_CTRL_PME_ENABLE; | |
1807 | ||
337001b6 | 1808 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); |
2cef548a RW |
1809 | } |
1810 | ||
1811 | /** | |
1812 | * pci_pme_active - enable or disable PCI device's PME# function | |
1813 | * @dev: PCI device to handle. | |
1814 | * @enable: 'true' to enable PME# generation; 'false' to disable it. | |
1815 | * | |
1816 | * The caller must verify that the device is capable of generating PME# before | |
1817 | * calling this function with @enable equal to 'true'. | |
1818 | */ | |
1819 | void pci_pme_active(struct pci_dev *dev, bool enable) | |
1820 | { | |
1821 | __pci_pme_active(dev, enable); | |
eb9d0fe4 | 1822 | |
6e965e0d HY |
1823 | /* |
1824 | * PCI (as opposed to PCIe) PME requires that the device have | |
1825 | * its PME# line hooked up correctly. Not all hardware vendors | |
1826 | * do this, so the PME never gets delivered and the device | |
1827 | * remains asleep. The easiest way around this is to | |
1828 | * periodically walk the list of suspended devices and check | |
1829 | * whether any have their PME flag set. The assumption is that | |
1830 | * we'll wake up often enough anyway that this won't be a huge | |
1831 | * hit, and the power savings from the devices will still be a | |
1832 | * win. | |
1833 | * | |
1834 | * Although PCIe uses in-band PME message instead of PME# line | |
1835 | * to report PME, PME does not work for some PCIe devices in | |
1836 | * reality. For example, there are devices that set their PME | |
1837 | * status bits, but don't really bother to send a PME message; | |
1838 | * there are PCI Express Root Ports that don't bother to | |
1839 | * trigger interrupts when they receive PME messages from the | |
1840 | * devices below. So PME poll is used for PCIe devices too. | |
1841 | */ | |
df17e62e | 1842 | |
379021d5 | 1843 | if (dev->pme_poll) { |
df17e62e MG |
1844 | struct pci_pme_device *pme_dev; |
1845 | if (enable) { | |
1846 | pme_dev = kmalloc(sizeof(struct pci_pme_device), | |
1847 | GFP_KERNEL); | |
0394cb19 BH |
1848 | if (!pme_dev) { |
1849 | dev_warn(&dev->dev, "can't enable PME#\n"); | |
1850 | return; | |
1851 | } | |
df17e62e MG |
1852 | pme_dev->dev = dev; |
1853 | mutex_lock(&pci_pme_list_mutex); | |
1854 | list_add(&pme_dev->list, &pci_pme_list); | |
1855 | if (list_is_singular(&pci_pme_list)) | |
ea00353f LW |
1856 | queue_delayed_work(system_freezable_wq, |
1857 | &pci_pme_work, | |
1858 | msecs_to_jiffies(PME_TIMEOUT)); | |
df17e62e MG |
1859 | mutex_unlock(&pci_pme_list_mutex); |
1860 | } else { | |
1861 | mutex_lock(&pci_pme_list_mutex); | |
1862 | list_for_each_entry(pme_dev, &pci_pme_list, list) { | |
1863 | if (pme_dev->dev == dev) { | |
1864 | list_del(&pme_dev->list); | |
1865 | kfree(pme_dev); | |
1866 | break; | |
1867 | } | |
1868 | } | |
1869 | mutex_unlock(&pci_pme_list_mutex); | |
1870 | } | |
1871 | } | |
1872 | ||
85b8582d | 1873 | dev_dbg(&dev->dev, "PME# %s\n", enable ? "enabled" : "disabled"); |
eb9d0fe4 | 1874 | } |
b7fe9434 | 1875 | EXPORT_SYMBOL(pci_pme_active); |
eb9d0fe4 | 1876 | |
1da177e4 | 1877 | /** |
6cbf8214 | 1878 | * __pci_enable_wake - enable PCI device as wakeup event source |
075c1771 DB |
1879 | * @dev: PCI device affected |
1880 | * @state: PCI state from which device will issue wakeup events | |
6cbf8214 | 1881 | * @runtime: True if the events are to be generated at run time |
075c1771 DB |
1882 | * @enable: True to enable event generation; false to disable |
1883 | * | |
1884 | * This enables the device as a wakeup event source, or disables it. | |
1885 | * When such events involves platform-specific hooks, those hooks are | |
1886 | * called automatically by this routine. | |
1887 | * | |
1888 | * Devices with legacy power management (no standard PCI PM capabilities) | |
eb9d0fe4 | 1889 | * always require such platform hooks. |
075c1771 | 1890 | * |
eb9d0fe4 RW |
1891 | * RETURN VALUE: |
1892 | * 0 is returned on success | |
1893 | * -EINVAL is returned if device is not supposed to wake up the system | |
1894 | * Error code depending on the platform is returned if both the platform and | |
1895 | * the native mechanism fail to enable the generation of wake-up events | |
1da177e4 | 1896 | */ |
6cbf8214 RW |
1897 | int __pci_enable_wake(struct pci_dev *dev, pci_power_t state, |
1898 | bool runtime, bool enable) | |
1da177e4 | 1899 | { |
5bcc2fb4 | 1900 | int ret = 0; |
075c1771 | 1901 | |
6cbf8214 | 1902 | if (enable && !runtime && !device_may_wakeup(&dev->dev)) |
eb9d0fe4 | 1903 | return -EINVAL; |
1da177e4 | 1904 | |
e80bb09d RW |
1905 | /* Don't do the same thing twice in a row for one device. */ |
1906 | if (!!enable == !!dev->wakeup_prepared) | |
1907 | return 0; | |
1908 | ||
eb9d0fe4 RW |
1909 | /* |
1910 | * According to "PCI System Architecture" 4th ed. by Tom Shanley & Don | |
1911 | * Anderson we should be doing PME# wake enable followed by ACPI wake | |
1912 | * enable. To disable wake-up we call the platform first, for symmetry. | |
075c1771 | 1913 | */ |
1da177e4 | 1914 | |
5bcc2fb4 RW |
1915 | if (enable) { |
1916 | int error; | |
1da177e4 | 1917 | |
5bcc2fb4 RW |
1918 | if (pci_pme_capable(dev, state)) |
1919 | pci_pme_active(dev, true); | |
1920 | else | |
1921 | ret = 1; | |
6cbf8214 RW |
1922 | error = runtime ? platform_pci_run_wake(dev, true) : |
1923 | platform_pci_sleep_wake(dev, true); | |
5bcc2fb4 RW |
1924 | if (ret) |
1925 | ret = error; | |
e80bb09d RW |
1926 | if (!ret) |
1927 | dev->wakeup_prepared = true; | |
5bcc2fb4 | 1928 | } else { |
6cbf8214 RW |
1929 | if (runtime) |
1930 | platform_pci_run_wake(dev, false); | |
1931 | else | |
1932 | platform_pci_sleep_wake(dev, false); | |
5bcc2fb4 | 1933 | pci_pme_active(dev, false); |
e80bb09d | 1934 | dev->wakeup_prepared = false; |
5bcc2fb4 | 1935 | } |
1da177e4 | 1936 | |
5bcc2fb4 | 1937 | return ret; |
eb9d0fe4 | 1938 | } |
6cbf8214 | 1939 | EXPORT_SYMBOL(__pci_enable_wake); |
1da177e4 | 1940 | |
0235c4fc RW |
1941 | /** |
1942 | * pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold | |
1943 | * @dev: PCI device to prepare | |
1944 | * @enable: True to enable wake-up event generation; false to disable | |
1945 | * | |
1946 | * Many drivers want the device to wake up the system from D3_hot or D3_cold | |
1947 | * and this function allows them to set that up cleanly - pci_enable_wake() | |
1948 | * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI | |
1949 | * ordering constraints. | |
1950 | * | |
1951 | * This function only returns error code if the device is not capable of | |
1952 | * generating PME# from both D3_hot and D3_cold, and the platform is unable to | |
1953 | * enable wake-up power for it. | |
1954 | */ | |
1955 | int pci_wake_from_d3(struct pci_dev *dev, bool enable) | |
1956 | { | |
1957 | return pci_pme_capable(dev, PCI_D3cold) ? | |
1958 | pci_enable_wake(dev, PCI_D3cold, enable) : | |
1959 | pci_enable_wake(dev, PCI_D3hot, enable); | |
1960 | } | |
b7fe9434 | 1961 | EXPORT_SYMBOL(pci_wake_from_d3); |
0235c4fc | 1962 | |
404cc2d8 | 1963 | /** |
37139074 JB |
1964 | * pci_target_state - find an appropriate low power state for a given PCI dev |
1965 | * @dev: PCI device | |
1966 | * | |
1967 | * Use underlying platform code to find a supported low power state for @dev. | |
1968 | * If the platform can't manage @dev, return the deepest state from which it | |
1969 | * can generate wake events, based on any available PME info. | |
404cc2d8 | 1970 | */ |
0b950f0f | 1971 | static pci_power_t pci_target_state(struct pci_dev *dev) |
404cc2d8 RW |
1972 | { |
1973 | pci_power_t target_state = PCI_D3hot; | |
404cc2d8 RW |
1974 | |
1975 | if (platform_pci_power_manageable(dev)) { | |
1976 | /* | |
1977 | * Call the platform to choose the target state of the device | |
1978 | * and enable wake-up from this state if supported. | |
1979 | */ | |
1980 | pci_power_t state = platform_pci_choose_state(dev); | |
1981 | ||
1982 | switch (state) { | |
1983 | case PCI_POWER_ERROR: | |
1984 | case PCI_UNKNOWN: | |
1985 | break; | |
1986 | case PCI_D1: | |
1987 | case PCI_D2: | |
1988 | if (pci_no_d1d2(dev)) | |
1989 | break; | |
1990 | default: | |
1991 | target_state = state; | |
404cc2d8 | 1992 | } |
4132a577 LW |
1993 | |
1994 | return target_state; | |
1995 | } | |
1996 | ||
1997 | if (!dev->pm_cap) | |
d2abdf62 | 1998 | target_state = PCI_D0; |
4132a577 LW |
1999 | |
2000 | /* | |
2001 | * If the device is in D3cold even though it's not power-manageable by | |
2002 | * the platform, it may have been powered down by non-standard means. | |
2003 | * Best to let it slumber. | |
2004 | */ | |
2005 | if (dev->current_state == PCI_D3cold) | |
2006 | target_state = PCI_D3cold; | |
2007 | ||
2008 | if (device_may_wakeup(&dev->dev)) { | |
404cc2d8 RW |
2009 | /* |
2010 | * Find the deepest state from which the device can generate | |
2011 | * wake-up events, make it the target state and enable device | |
2012 | * to generate PME#. | |
2013 | */ | |
337001b6 RW |
2014 | if (dev->pme_support) { |
2015 | while (target_state | |
2016 | && !(dev->pme_support & (1 << target_state))) | |
2017 | target_state--; | |
404cc2d8 RW |
2018 | } |
2019 | } | |
2020 | ||
e5899e1b RW |
2021 | return target_state; |
2022 | } | |
2023 | ||
2024 | /** | |
2025 | * pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state | |
2026 | * @dev: Device to handle. | |
2027 | * | |
2028 | * Choose the power state appropriate for the device depending on whether | |
2029 | * it can wake up the system and/or is power manageable by the platform | |
2030 | * (PCI_D3hot is the default) and put the device into that state. | |
2031 | */ | |
2032 | int pci_prepare_to_sleep(struct pci_dev *dev) | |
2033 | { | |
2034 | pci_power_t target_state = pci_target_state(dev); | |
2035 | int error; | |
2036 | ||
2037 | if (target_state == PCI_POWER_ERROR) | |
2038 | return -EIO; | |
2039 | ||
8efb8c76 | 2040 | pci_enable_wake(dev, target_state, device_may_wakeup(&dev->dev)); |
c157dfa3 | 2041 | |
404cc2d8 RW |
2042 | error = pci_set_power_state(dev, target_state); |
2043 | ||
2044 | if (error) | |
2045 | pci_enable_wake(dev, target_state, false); | |
2046 | ||
2047 | return error; | |
2048 | } | |
b7fe9434 | 2049 | EXPORT_SYMBOL(pci_prepare_to_sleep); |
404cc2d8 RW |
2050 | |
2051 | /** | |
443bd1c4 | 2052 | * pci_back_from_sleep - turn PCI device on during system-wide transition into working state |
404cc2d8 RW |
2053 | * @dev: Device to handle. |
2054 | * | |
88393161 | 2055 | * Disable device's system wake-up capability and put it into D0. |
404cc2d8 RW |
2056 | */ |
2057 | int pci_back_from_sleep(struct pci_dev *dev) | |
2058 | { | |
2059 | pci_enable_wake(dev, PCI_D0, false); | |
2060 | return pci_set_power_state(dev, PCI_D0); | |
2061 | } | |
b7fe9434 | 2062 | EXPORT_SYMBOL(pci_back_from_sleep); |
404cc2d8 | 2063 | |
6cbf8214 RW |
2064 | /** |
2065 | * pci_finish_runtime_suspend - Carry out PCI-specific part of runtime suspend. | |
2066 | * @dev: PCI device being suspended. | |
2067 | * | |
2068 | * Prepare @dev to generate wake-up events at run time and put it into a low | |
2069 | * power state. | |
2070 | */ | |
2071 | int pci_finish_runtime_suspend(struct pci_dev *dev) | |
2072 | { | |
2073 | pci_power_t target_state = pci_target_state(dev); | |
2074 | int error; | |
2075 | ||
2076 | if (target_state == PCI_POWER_ERROR) | |
2077 | return -EIO; | |
2078 | ||
448bd857 HY |
2079 | dev->runtime_d3cold = target_state == PCI_D3cold; |
2080 | ||
6cbf8214 RW |
2081 | __pci_enable_wake(dev, target_state, true, pci_dev_run_wake(dev)); |
2082 | ||
2083 | error = pci_set_power_state(dev, target_state); | |
2084 | ||
448bd857 | 2085 | if (error) { |
6cbf8214 | 2086 | __pci_enable_wake(dev, target_state, true, false); |
448bd857 HY |
2087 | dev->runtime_d3cold = false; |
2088 | } | |
6cbf8214 RW |
2089 | |
2090 | return error; | |
2091 | } | |
2092 | ||
b67ea761 RW |
2093 | /** |
2094 | * pci_dev_run_wake - Check if device can generate run-time wake-up events. | |
2095 | * @dev: Device to check. | |
2096 | * | |
f7625980 | 2097 | * Return true if the device itself is capable of generating wake-up events |
b67ea761 RW |
2098 | * (through the platform or using the native PCIe PME) or if the device supports |
2099 | * PME and one of its upstream bridges can generate wake-up events. | |
2100 | */ | |
2101 | bool pci_dev_run_wake(struct pci_dev *dev) | |
2102 | { | |
2103 | struct pci_bus *bus = dev->bus; | |
2104 | ||
2105 | if (device_run_wake(&dev->dev)) | |
2106 | return true; | |
2107 | ||
2108 | if (!dev->pme_support) | |
2109 | return false; | |
2110 | ||
6496ebd7 AS |
2111 | /* PME-capable in principle, but not from the intended sleep state */ |
2112 | if (!pci_pme_capable(dev, pci_target_state(dev))) | |
2113 | return false; | |
2114 | ||
b67ea761 RW |
2115 | while (bus->parent) { |
2116 | struct pci_dev *bridge = bus->self; | |
2117 | ||
2118 | if (device_run_wake(&bridge->dev)) | |
2119 | return true; | |
2120 | ||
2121 | bus = bus->parent; | |
2122 | } | |
2123 | ||
2124 | /* We have reached the root bus. */ | |
2125 | if (bus->bridge) | |
2126 | return device_run_wake(bus->bridge); | |
2127 | ||
2128 | return false; | |
2129 | } | |
2130 | EXPORT_SYMBOL_GPL(pci_dev_run_wake); | |
2131 | ||
bac2a909 RW |
2132 | /** |
2133 | * pci_dev_keep_suspended - Check if the device can stay in the suspended state. | |
2134 | * @pci_dev: Device to check. | |
2135 | * | |
2136 | * Return 'true' if the device is runtime-suspended, it doesn't have to be | |
2137 | * reconfigured due to wakeup settings difference between system and runtime | |
2138 | * suspend and the current power state of it is suitable for the upcoming | |
2139 | * (system) transition. | |
2cef548a RW |
2140 | * |
2141 | * If the device is not configured for system wakeup, disable PME for it before | |
2142 | * returning 'true' to prevent it from waking up the system unnecessarily. | |
bac2a909 RW |
2143 | */ |
2144 | bool pci_dev_keep_suspended(struct pci_dev *pci_dev) | |
2145 | { | |
2146 | struct device *dev = &pci_dev->dev; | |
2147 | ||
2148 | if (!pm_runtime_suspended(dev) | |
2cef548a | 2149 | || pci_target_state(pci_dev) != pci_dev->current_state |
bac2a909 RW |
2150 | || platform_pci_need_resume(pci_dev)) |
2151 | return false; | |
2152 | ||
2cef548a RW |
2153 | /* |
2154 | * At this point the device is good to go unless it's been configured | |
2155 | * to generate PME at the runtime suspend time, but it is not supposed | |
2156 | * to wake up the system. In that case, simply disable PME for it | |
2157 | * (it will have to be re-enabled on exit from system resume). | |
2158 | * | |
2159 | * If the device's power state is D3cold and the platform check above | |
2160 | * hasn't triggered, the device's configuration is suitable and we don't | |
2161 | * need to manipulate it at all. | |
2162 | */ | |
2163 | spin_lock_irq(&dev->power.lock); | |
2164 | ||
2165 | if (pm_runtime_suspended(dev) && pci_dev->current_state < PCI_D3cold && | |
2166 | !device_may_wakeup(dev)) | |
2167 | __pci_pme_active(pci_dev, false); | |
2168 | ||
2169 | spin_unlock_irq(&dev->power.lock); | |
2170 | return true; | |
2171 | } | |
2172 | ||
2173 | /** | |
2174 | * pci_dev_complete_resume - Finalize resume from system sleep for a device. | |
2175 | * @pci_dev: Device to handle. | |
2176 | * | |
2177 | * If the device is runtime suspended and wakeup-capable, enable PME for it as | |
2178 | * it might have been disabled during the prepare phase of system suspend if | |
2179 | * the device was not configured for system wakeup. | |
2180 | */ | |
2181 | void pci_dev_complete_resume(struct pci_dev *pci_dev) | |
2182 | { | |
2183 | struct device *dev = &pci_dev->dev; | |
2184 | ||
2185 | if (!pci_dev_run_wake(pci_dev)) | |
2186 | return; | |
2187 | ||
2188 | spin_lock_irq(&dev->power.lock); | |
2189 | ||
2190 | if (pm_runtime_suspended(dev) && pci_dev->current_state < PCI_D3cold) | |
2191 | __pci_pme_active(pci_dev, true); | |
2192 | ||
2193 | spin_unlock_irq(&dev->power.lock); | |
bac2a909 RW |
2194 | } |
2195 | ||
b3c32c4f HY |
2196 | void pci_config_pm_runtime_get(struct pci_dev *pdev) |
2197 | { | |
2198 | struct device *dev = &pdev->dev; | |
2199 | struct device *parent = dev->parent; | |
2200 | ||
2201 | if (parent) | |
2202 | pm_runtime_get_sync(parent); | |
2203 | pm_runtime_get_noresume(dev); | |
2204 | /* | |
2205 | * pdev->current_state is set to PCI_D3cold during suspending, | |
2206 | * so wait until suspending completes | |
2207 | */ | |
2208 | pm_runtime_barrier(dev); | |
2209 | /* | |
2210 | * Only need to resume devices in D3cold, because config | |
2211 | * registers are still accessible for devices suspended but | |
2212 | * not in D3cold. | |
2213 | */ | |
2214 | if (pdev->current_state == PCI_D3cold) | |
2215 | pm_runtime_resume(dev); | |
2216 | } | |
2217 | ||
2218 | void pci_config_pm_runtime_put(struct pci_dev *pdev) | |
2219 | { | |
2220 | struct device *dev = &pdev->dev; | |
2221 | struct device *parent = dev->parent; | |
2222 | ||
2223 | pm_runtime_put(dev); | |
2224 | if (parent) | |
2225 | pm_runtime_put_sync(parent); | |
2226 | } | |
2227 | ||
9d26d3a8 MW |
2228 | /** |
2229 | * pci_bridge_d3_possible - Is it possible to put the bridge into D3 | |
2230 | * @bridge: Bridge to check | |
2231 | * | |
2232 | * This function checks if it is possible to move the bridge to D3. | |
2233 | * Currently we only allow D3 for recent enough PCIe ports. | |
2234 | */ | |
c6a63307 | 2235 | bool pci_bridge_d3_possible(struct pci_dev *bridge) |
9d26d3a8 MW |
2236 | { |
2237 | unsigned int year; | |
2238 | ||
2239 | if (!pci_is_pcie(bridge)) | |
2240 | return false; | |
2241 | ||
2242 | switch (pci_pcie_type(bridge)) { | |
2243 | case PCI_EXP_TYPE_ROOT_PORT: | |
2244 | case PCI_EXP_TYPE_UPSTREAM: | |
2245 | case PCI_EXP_TYPE_DOWNSTREAM: | |
2246 | if (pci_bridge_d3_disable) | |
2247 | return false; | |
97a90aee LW |
2248 | |
2249 | /* | |
d98e0929 BH |
2250 | * Hotplug interrupts cannot be delivered if the link is down, |
2251 | * so parents of a hotplug port must stay awake. In addition, | |
2252 | * hotplug ports handled by firmware in System Management Mode | |
97a90aee | 2253 | * may not be put into D3 by the OS (Thunderbolt on non-Macs). |
d98e0929 | 2254 | * For simplicity, disallow in general for now. |
97a90aee | 2255 | */ |
d98e0929 | 2256 | if (bridge->is_hotplug_bridge) |
97a90aee LW |
2257 | return false; |
2258 | ||
9d26d3a8 MW |
2259 | if (pci_bridge_d3_force) |
2260 | return true; | |
2261 | ||
2262 | /* | |
2263 | * It should be safe to put PCIe ports from 2015 or newer | |
2264 | * to D3. | |
2265 | */ | |
2266 | if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && | |
2267 | year >= 2015) { | |
2268 | return true; | |
2269 | } | |
2270 | break; | |
2271 | } | |
2272 | ||
2273 | return false; | |
2274 | } | |
2275 | ||
2276 | static int pci_dev_check_d3cold(struct pci_dev *dev, void *data) | |
2277 | { | |
2278 | bool *d3cold_ok = data; | |
9d26d3a8 | 2279 | |
718a0609 LW |
2280 | if (/* The device needs to be allowed to go D3cold ... */ |
2281 | dev->no_d3cold || !dev->d3cold_allowed || | |
2282 | ||
2283 | /* ... and if it is wakeup capable to do so from D3cold. */ | |
2284 | (device_may_wakeup(&dev->dev) && | |
2285 | !pci_pme_capable(dev, PCI_D3cold)) || | |
2286 | ||
2287 | /* If it is a bridge it must be allowed to go to D3. */ | |
d98e0929 | 2288 | !pci_power_manageable(dev)) |
9d26d3a8 | 2289 | |
718a0609 | 2290 | *d3cold_ok = false; |
9d26d3a8 | 2291 | |
718a0609 | 2292 | return !*d3cold_ok; |
9d26d3a8 MW |
2293 | } |
2294 | ||
2295 | /* | |
2296 | * pci_bridge_d3_update - Update bridge D3 capabilities | |
2297 | * @dev: PCI device which is changed | |
9d26d3a8 MW |
2298 | * |
2299 | * Update upstream bridge PM capabilities accordingly depending on if the | |
2300 | * device PM configuration was changed or the device is being removed. The | |
2301 | * change is also propagated upstream. | |
2302 | */ | |
1ed276a7 | 2303 | void pci_bridge_d3_update(struct pci_dev *dev) |
9d26d3a8 | 2304 | { |
1ed276a7 | 2305 | bool remove = !device_is_registered(&dev->dev); |
9d26d3a8 MW |
2306 | struct pci_dev *bridge; |
2307 | bool d3cold_ok = true; | |
2308 | ||
2309 | bridge = pci_upstream_bridge(dev); | |
2310 | if (!bridge || !pci_bridge_d3_possible(bridge)) | |
2311 | return; | |
2312 | ||
9d26d3a8 | 2313 | /* |
e8559b71 LW |
2314 | * If D3 is currently allowed for the bridge, removing one of its |
2315 | * children won't change that. | |
2316 | */ | |
2317 | if (remove && bridge->bridge_d3) | |
2318 | return; | |
2319 | ||
2320 | /* | |
2321 | * If D3 is currently allowed for the bridge and a child is added or | |
2322 | * changed, disallowance of D3 can only be caused by that child, so | |
2323 | * we only need to check that single device, not any of its siblings. | |
2324 | * | |
2325 | * If D3 is currently not allowed for the bridge, checking the device | |
2326 | * first may allow us to skip checking its siblings. | |
9d26d3a8 MW |
2327 | */ |
2328 | if (!remove) | |
2329 | pci_dev_check_d3cold(dev, &d3cold_ok); | |
2330 | ||
e8559b71 LW |
2331 | /* |
2332 | * If D3 is currently not allowed for the bridge, this may be caused | |
2333 | * either by the device being changed/removed or any of its siblings, | |
2334 | * so we need to go through all children to find out if one of them | |
2335 | * continues to block D3. | |
2336 | */ | |
2337 | if (d3cold_ok && !bridge->bridge_d3) | |
9d26d3a8 MW |
2338 | pci_walk_bus(bridge->subordinate, pci_dev_check_d3cold, |
2339 | &d3cold_ok); | |
9d26d3a8 MW |
2340 | |
2341 | if (bridge->bridge_d3 != d3cold_ok) { | |
2342 | bridge->bridge_d3 = d3cold_ok; | |
2343 | /* Propagate change to upstream bridges */ | |
1ed276a7 | 2344 | pci_bridge_d3_update(bridge); |
9d26d3a8 | 2345 | } |
9d26d3a8 MW |
2346 | } |
2347 | ||
9d26d3a8 MW |
2348 | /** |
2349 | * pci_d3cold_enable - Enable D3cold for device | |
2350 | * @dev: PCI device to handle | |
2351 | * | |
2352 | * This function can be used in drivers to enable D3cold from the device | |
2353 | * they handle. It also updates upstream PCI bridge PM capabilities | |
2354 | * accordingly. | |
2355 | */ | |
2356 | void pci_d3cold_enable(struct pci_dev *dev) | |
2357 | { | |
2358 | if (dev->no_d3cold) { | |
2359 | dev->no_d3cold = false; | |
1ed276a7 | 2360 | pci_bridge_d3_update(dev); |
9d26d3a8 MW |
2361 | } |
2362 | } | |
2363 | EXPORT_SYMBOL_GPL(pci_d3cold_enable); | |
2364 | ||
2365 | /** | |
2366 | * pci_d3cold_disable - Disable D3cold for device | |
2367 | * @dev: PCI device to handle | |
2368 | * | |
2369 | * This function can be used in drivers to disable D3cold from the device | |
2370 | * they handle. It also updates upstream PCI bridge PM capabilities | |
2371 | * accordingly. | |
2372 | */ | |
2373 | void pci_d3cold_disable(struct pci_dev *dev) | |
2374 | { | |
2375 | if (!dev->no_d3cold) { | |
2376 | dev->no_d3cold = true; | |
1ed276a7 | 2377 | pci_bridge_d3_update(dev); |
9d26d3a8 MW |
2378 | } |
2379 | } | |
2380 | EXPORT_SYMBOL_GPL(pci_d3cold_disable); | |
2381 | ||
eb9d0fe4 RW |
2382 | /** |
2383 | * pci_pm_init - Initialize PM functions of given PCI device | |
2384 | * @dev: PCI device to handle. | |
2385 | */ | |
2386 | void pci_pm_init(struct pci_dev *dev) | |
2387 | { | |
2388 | int pm; | |
2389 | u16 pmc; | |
1da177e4 | 2390 | |
bb910a70 | 2391 | pm_runtime_forbid(&dev->dev); |
967577b0 HY |
2392 | pm_runtime_set_active(&dev->dev); |
2393 | pm_runtime_enable(&dev->dev); | |
a1e4d72c | 2394 | device_enable_async_suspend(&dev->dev); |
e80bb09d | 2395 | dev->wakeup_prepared = false; |
bb910a70 | 2396 | |
337001b6 | 2397 | dev->pm_cap = 0; |
ffaddbe8 | 2398 | dev->pme_support = 0; |
337001b6 | 2399 | |
eb9d0fe4 RW |
2400 | /* find PCI PM capability in list */ |
2401 | pm = pci_find_capability(dev, PCI_CAP_ID_PM); | |
2402 | if (!pm) | |
50246dd4 | 2403 | return; |
eb9d0fe4 RW |
2404 | /* Check device's ability to generate PME# */ |
2405 | pci_read_config_word(dev, pm + PCI_PM_PMC, &pmc); | |
075c1771 | 2406 | |
eb9d0fe4 RW |
2407 | if ((pmc & PCI_PM_CAP_VER_MASK) > 3) { |
2408 | dev_err(&dev->dev, "unsupported PM cap regs version (%u)\n", | |
2409 | pmc & PCI_PM_CAP_VER_MASK); | |
50246dd4 | 2410 | return; |
eb9d0fe4 RW |
2411 | } |
2412 | ||
337001b6 | 2413 | dev->pm_cap = pm; |
1ae861e6 | 2414 | dev->d3_delay = PCI_PM_D3_WAIT; |
448bd857 | 2415 | dev->d3cold_delay = PCI_PM_D3COLD_WAIT; |
9d26d3a8 | 2416 | dev->bridge_d3 = pci_bridge_d3_possible(dev); |
4f9c1397 | 2417 | dev->d3cold_allowed = true; |
337001b6 RW |
2418 | |
2419 | dev->d1_support = false; | |
2420 | dev->d2_support = false; | |
2421 | if (!pci_no_d1d2(dev)) { | |
c9ed77ee | 2422 | if (pmc & PCI_PM_CAP_D1) |
337001b6 | 2423 | dev->d1_support = true; |
c9ed77ee | 2424 | if (pmc & PCI_PM_CAP_D2) |
337001b6 | 2425 | dev->d2_support = true; |
c9ed77ee BH |
2426 | |
2427 | if (dev->d1_support || dev->d2_support) | |
2428 | dev_printk(KERN_DEBUG, &dev->dev, "supports%s%s\n", | |
ec84f126 JB |
2429 | dev->d1_support ? " D1" : "", |
2430 | dev->d2_support ? " D2" : ""); | |
337001b6 RW |
2431 | } |
2432 | ||
2433 | pmc &= PCI_PM_CAP_PME_MASK; | |
2434 | if (pmc) { | |
10c3d71d BH |
2435 | dev_printk(KERN_DEBUG, &dev->dev, |
2436 | "PME# supported from%s%s%s%s%s\n", | |
c9ed77ee BH |
2437 | (pmc & PCI_PM_CAP_PME_D0) ? " D0" : "", |
2438 | (pmc & PCI_PM_CAP_PME_D1) ? " D1" : "", | |
2439 | (pmc & PCI_PM_CAP_PME_D2) ? " D2" : "", | |
2440 | (pmc & PCI_PM_CAP_PME_D3) ? " D3hot" : "", | |
2441 | (pmc & PCI_PM_CAP_PME_D3cold) ? " D3cold" : ""); | |
337001b6 | 2442 | dev->pme_support = pmc >> PCI_PM_CAP_PME_SHIFT; |
379021d5 | 2443 | dev->pme_poll = true; |
eb9d0fe4 RW |
2444 | /* |
2445 | * Make device's PM flags reflect the wake-up capability, but | |
2446 | * let the user space enable it to wake up the system as needed. | |
2447 | */ | |
2448 | device_set_wakeup_capable(&dev->dev, true); | |
eb9d0fe4 | 2449 | /* Disable the PME# generation functionality */ |
337001b6 | 2450 | pci_pme_active(dev, false); |
eb9d0fe4 | 2451 | } |
1da177e4 LT |
2452 | } |
2453 | ||
938174e5 SS |
2454 | static unsigned long pci_ea_flags(struct pci_dev *dev, u8 prop) |
2455 | { | |
92efb1bd | 2456 | unsigned long flags = IORESOURCE_PCI_FIXED | IORESOURCE_PCI_EA_BEI; |
938174e5 SS |
2457 | |
2458 | switch (prop) { | |
2459 | case PCI_EA_P_MEM: | |
2460 | case PCI_EA_P_VF_MEM: | |
2461 | flags |= IORESOURCE_MEM; | |
2462 | break; | |
2463 | case PCI_EA_P_MEM_PREFETCH: | |
2464 | case PCI_EA_P_VF_MEM_PREFETCH: | |
2465 | flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
2466 | break; | |
2467 | case PCI_EA_P_IO: | |
2468 | flags |= IORESOURCE_IO; | |
2469 | break; | |
2470 | default: | |
2471 | return 0; | |
2472 | } | |
2473 | ||
2474 | return flags; | |
2475 | } | |
2476 | ||
2477 | static struct resource *pci_ea_get_resource(struct pci_dev *dev, u8 bei, | |
2478 | u8 prop) | |
2479 | { | |
2480 | if (bei <= PCI_EA_BEI_BAR5 && prop <= PCI_EA_P_IO) | |
2481 | return &dev->resource[bei]; | |
11183991 DD |
2482 | #ifdef CONFIG_PCI_IOV |
2483 | else if (bei >= PCI_EA_BEI_VF_BAR0 && bei <= PCI_EA_BEI_VF_BAR5 && | |
2484 | (prop == PCI_EA_P_VF_MEM || prop == PCI_EA_P_VF_MEM_PREFETCH)) | |
2485 | return &dev->resource[PCI_IOV_RESOURCES + | |
2486 | bei - PCI_EA_BEI_VF_BAR0]; | |
2487 | #endif | |
938174e5 SS |
2488 | else if (bei == PCI_EA_BEI_ROM) |
2489 | return &dev->resource[PCI_ROM_RESOURCE]; | |
2490 | else | |
2491 | return NULL; | |
2492 | } | |
2493 | ||
2494 | /* Read an Enhanced Allocation (EA) entry */ | |
2495 | static int pci_ea_read(struct pci_dev *dev, int offset) | |
2496 | { | |
2497 | struct resource *res; | |
2498 | int ent_size, ent_offset = offset; | |
2499 | resource_size_t start, end; | |
2500 | unsigned long flags; | |
26635112 | 2501 | u32 dw0, bei, base, max_offset; |
938174e5 SS |
2502 | u8 prop; |
2503 | bool support_64 = (sizeof(resource_size_t) >= 8); | |
2504 | ||
2505 | pci_read_config_dword(dev, ent_offset, &dw0); | |
2506 | ent_offset += 4; | |
2507 | ||
2508 | /* Entry size field indicates DWORDs after 1st */ | |
2509 | ent_size = ((dw0 & PCI_EA_ES) + 1) << 2; | |
2510 | ||
2511 | if (!(dw0 & PCI_EA_ENABLE)) /* Entry not enabled */ | |
2512 | goto out; | |
2513 | ||
26635112 BH |
2514 | bei = (dw0 & PCI_EA_BEI) >> 4; |
2515 | prop = (dw0 & PCI_EA_PP) >> 8; | |
2516 | ||
938174e5 SS |
2517 | /* |
2518 | * If the Property is in the reserved range, try the Secondary | |
2519 | * Property instead. | |
2520 | */ | |
2521 | if (prop > PCI_EA_P_BRIDGE_IO && prop < PCI_EA_P_MEM_RESERVED) | |
26635112 | 2522 | prop = (dw0 & PCI_EA_SP) >> 16; |
938174e5 SS |
2523 | if (prop > PCI_EA_P_BRIDGE_IO) |
2524 | goto out; | |
2525 | ||
26635112 | 2526 | res = pci_ea_get_resource(dev, bei, prop); |
938174e5 | 2527 | if (!res) { |
26635112 | 2528 | dev_err(&dev->dev, "Unsupported EA entry BEI: %u\n", bei); |
938174e5 SS |
2529 | goto out; |
2530 | } | |
2531 | ||
2532 | flags = pci_ea_flags(dev, prop); | |
2533 | if (!flags) { | |
2534 | dev_err(&dev->dev, "Unsupported EA properties: %#x\n", prop); | |
2535 | goto out; | |
2536 | } | |
2537 | ||
2538 | /* Read Base */ | |
2539 | pci_read_config_dword(dev, ent_offset, &base); | |
2540 | start = (base & PCI_EA_FIELD_MASK); | |
2541 | ent_offset += 4; | |
2542 | ||
2543 | /* Read MaxOffset */ | |
2544 | pci_read_config_dword(dev, ent_offset, &max_offset); | |
2545 | ent_offset += 4; | |
2546 | ||
2547 | /* Read Base MSBs (if 64-bit entry) */ | |
2548 | if (base & PCI_EA_IS_64) { | |
2549 | u32 base_upper; | |
2550 | ||
2551 | pci_read_config_dword(dev, ent_offset, &base_upper); | |
2552 | ent_offset += 4; | |
2553 | ||
2554 | flags |= IORESOURCE_MEM_64; | |
2555 | ||
2556 | /* entry starts above 32-bit boundary, can't use */ | |
2557 | if (!support_64 && base_upper) | |
2558 | goto out; | |
2559 | ||
2560 | if (support_64) | |
2561 | start |= ((u64)base_upper << 32); | |
2562 | } | |
2563 | ||
2564 | end = start + (max_offset | 0x03); | |
2565 | ||
2566 | /* Read MaxOffset MSBs (if 64-bit entry) */ | |
2567 | if (max_offset & PCI_EA_IS_64) { | |
2568 | u32 max_offset_upper; | |
2569 | ||
2570 | pci_read_config_dword(dev, ent_offset, &max_offset_upper); | |
2571 | ent_offset += 4; | |
2572 | ||
2573 | flags |= IORESOURCE_MEM_64; | |
2574 | ||
2575 | /* entry too big, can't use */ | |
2576 | if (!support_64 && max_offset_upper) | |
2577 | goto out; | |
2578 | ||
2579 | if (support_64) | |
2580 | end += ((u64)max_offset_upper << 32); | |
2581 | } | |
2582 | ||
2583 | if (end < start) { | |
2584 | dev_err(&dev->dev, "EA Entry crosses address boundary\n"); | |
2585 | goto out; | |
2586 | } | |
2587 | ||
2588 | if (ent_size != ent_offset - offset) { | |
2589 | dev_err(&dev->dev, | |
2590 | "EA Entry Size (%d) does not match length read (%d)\n", | |
2591 | ent_size, ent_offset - offset); | |
2592 | goto out; | |
2593 | } | |
2594 | ||
2595 | res->name = pci_name(dev); | |
2596 | res->start = start; | |
2597 | res->end = end; | |
2598 | res->flags = flags; | |
597becb4 BH |
2599 | |
2600 | if (bei <= PCI_EA_BEI_BAR5) | |
2601 | dev_printk(KERN_DEBUG, &dev->dev, "BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n", | |
2602 | bei, res, prop); | |
2603 | else if (bei == PCI_EA_BEI_ROM) | |
2604 | dev_printk(KERN_DEBUG, &dev->dev, "ROM: %pR (from Enhanced Allocation, properties %#02x)\n", | |
2605 | res, prop); | |
2606 | else if (bei >= PCI_EA_BEI_VF_BAR0 && bei <= PCI_EA_BEI_VF_BAR5) | |
2607 | dev_printk(KERN_DEBUG, &dev->dev, "VF BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n", | |
2608 | bei - PCI_EA_BEI_VF_BAR0, res, prop); | |
2609 | else | |
2610 | dev_printk(KERN_DEBUG, &dev->dev, "BEI %d res: %pR (from Enhanced Allocation, properties %#02x)\n", | |
2611 | bei, res, prop); | |
2612 | ||
938174e5 SS |
2613 | out: |
2614 | return offset + ent_size; | |
2615 | } | |
2616 | ||
dcbb408a | 2617 | /* Enhanced Allocation Initialization */ |
938174e5 SS |
2618 | void pci_ea_init(struct pci_dev *dev) |
2619 | { | |
2620 | int ea; | |
2621 | u8 num_ent; | |
2622 | int offset; | |
2623 | int i; | |
2624 | ||
2625 | /* find PCI EA capability in list */ | |
2626 | ea = pci_find_capability(dev, PCI_CAP_ID_EA); | |
2627 | if (!ea) | |
2628 | return; | |
2629 | ||
2630 | /* determine the number of entries */ | |
2631 | pci_bus_read_config_byte(dev->bus, dev->devfn, ea + PCI_EA_NUM_ENT, | |
2632 | &num_ent); | |
2633 | num_ent &= PCI_EA_NUM_ENT_MASK; | |
2634 | ||
2635 | offset = ea + PCI_EA_FIRST_ENT; | |
2636 | ||
2637 | /* Skip DWORD 2 for type 1 functions */ | |
2638 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) | |
2639 | offset += 4; | |
2640 | ||
2641 | /* parse each EA entry */ | |
2642 | for (i = 0; i < num_ent; ++i) | |
2643 | offset = pci_ea_read(dev, offset); | |
2644 | } | |
2645 | ||
34a4876e YL |
2646 | static void pci_add_saved_cap(struct pci_dev *pci_dev, |
2647 | struct pci_cap_saved_state *new_cap) | |
2648 | { | |
2649 | hlist_add_head(&new_cap->next, &pci_dev->saved_cap_space); | |
2650 | } | |
2651 | ||
63f4898a | 2652 | /** |
fd0f7f73 AW |
2653 | * _pci_add_cap_save_buffer - allocate buffer for saving given |
2654 | * capability registers | |
63f4898a RW |
2655 | * @dev: the PCI device |
2656 | * @cap: the capability to allocate the buffer for | |
fd0f7f73 | 2657 | * @extended: Standard or Extended capability ID |
63f4898a RW |
2658 | * @size: requested size of the buffer |
2659 | */ | |
fd0f7f73 AW |
2660 | static int _pci_add_cap_save_buffer(struct pci_dev *dev, u16 cap, |
2661 | bool extended, unsigned int size) | |
63f4898a RW |
2662 | { |
2663 | int pos; | |
2664 | struct pci_cap_saved_state *save_state; | |
2665 | ||
fd0f7f73 AW |
2666 | if (extended) |
2667 | pos = pci_find_ext_capability(dev, cap); | |
2668 | else | |
2669 | pos = pci_find_capability(dev, cap); | |
2670 | ||
0a1a9b49 | 2671 | if (!pos) |
63f4898a RW |
2672 | return 0; |
2673 | ||
2674 | save_state = kzalloc(sizeof(*save_state) + size, GFP_KERNEL); | |
2675 | if (!save_state) | |
2676 | return -ENOMEM; | |
2677 | ||
24a4742f | 2678 | save_state->cap.cap_nr = cap; |
fd0f7f73 | 2679 | save_state->cap.cap_extended = extended; |
24a4742f | 2680 | save_state->cap.size = size; |
63f4898a RW |
2681 | pci_add_saved_cap(dev, save_state); |
2682 | ||
2683 | return 0; | |
2684 | } | |
2685 | ||
fd0f7f73 AW |
2686 | int pci_add_cap_save_buffer(struct pci_dev *dev, char cap, unsigned int size) |
2687 | { | |
2688 | return _pci_add_cap_save_buffer(dev, cap, false, size); | |
2689 | } | |
2690 | ||
2691 | int pci_add_ext_cap_save_buffer(struct pci_dev *dev, u16 cap, unsigned int size) | |
2692 | { | |
2693 | return _pci_add_cap_save_buffer(dev, cap, true, size); | |
2694 | } | |
2695 | ||
63f4898a RW |
2696 | /** |
2697 | * pci_allocate_cap_save_buffers - allocate buffers for saving capabilities | |
2698 | * @dev: the PCI device | |
2699 | */ | |
2700 | void pci_allocate_cap_save_buffers(struct pci_dev *dev) | |
2701 | { | |
2702 | int error; | |
2703 | ||
89858517 YZ |
2704 | error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_EXP, |
2705 | PCI_EXP_SAVE_REGS * sizeof(u16)); | |
63f4898a RW |
2706 | if (error) |
2707 | dev_err(&dev->dev, | |
2708 | "unable to preallocate PCI Express save buffer\n"); | |
2709 | ||
2710 | error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_PCIX, sizeof(u16)); | |
2711 | if (error) | |
2712 | dev_err(&dev->dev, | |
2713 | "unable to preallocate PCI-X save buffer\n"); | |
425c1b22 AW |
2714 | |
2715 | pci_allocate_vc_save_buffers(dev); | |
63f4898a RW |
2716 | } |
2717 | ||
f796841e YL |
2718 | void pci_free_cap_save_buffers(struct pci_dev *dev) |
2719 | { | |
2720 | struct pci_cap_saved_state *tmp; | |
b67bfe0d | 2721 | struct hlist_node *n; |
f796841e | 2722 | |
b67bfe0d | 2723 | hlist_for_each_entry_safe(tmp, n, &dev->saved_cap_space, next) |
f796841e YL |
2724 | kfree(tmp); |
2725 | } | |
2726 | ||
58c3a727 | 2727 | /** |
31ab2476 | 2728 | * pci_configure_ari - enable or disable ARI forwarding |
58c3a727 | 2729 | * @dev: the PCI device |
b0cc6020 YW |
2730 | * |
2731 | * If @dev and its upstream bridge both support ARI, enable ARI in the | |
2732 | * bridge. Otherwise, disable ARI in the bridge. | |
58c3a727 | 2733 | */ |
31ab2476 | 2734 | void pci_configure_ari(struct pci_dev *dev) |
58c3a727 | 2735 | { |
58c3a727 | 2736 | u32 cap; |
8113587c | 2737 | struct pci_dev *bridge; |
58c3a727 | 2738 | |
6748dcc2 | 2739 | if (pcie_ari_disabled || !pci_is_pcie(dev) || dev->devfn) |
58c3a727 YZ |
2740 | return; |
2741 | ||
8113587c | 2742 | bridge = dev->bus->self; |
cb97ae34 | 2743 | if (!bridge) |
8113587c ZY |
2744 | return; |
2745 | ||
59875ae4 | 2746 | pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2, &cap); |
58c3a727 YZ |
2747 | if (!(cap & PCI_EXP_DEVCAP2_ARI)) |
2748 | return; | |
2749 | ||
b0cc6020 YW |
2750 | if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI)) { |
2751 | pcie_capability_set_word(bridge, PCI_EXP_DEVCTL2, | |
2752 | PCI_EXP_DEVCTL2_ARI); | |
2753 | bridge->ari_enabled = 1; | |
2754 | } else { | |
2755 | pcie_capability_clear_word(bridge, PCI_EXP_DEVCTL2, | |
2756 | PCI_EXP_DEVCTL2_ARI); | |
2757 | bridge->ari_enabled = 0; | |
2758 | } | |
58c3a727 YZ |
2759 | } |
2760 | ||
5d990b62 CW |
2761 | static int pci_acs_enable; |
2762 | ||
2763 | /** | |
2764 | * pci_request_acs - ask for ACS to be enabled if supported | |
2765 | */ | |
2766 | void pci_request_acs(void) | |
2767 | { | |
2768 | pci_acs_enable = 1; | |
2769 | } | |
2770 | ||
ae21ee65 | 2771 | /** |
2c744244 | 2772 | * pci_std_enable_acs - enable ACS on devices using standard ACS capabilites |
ae21ee65 AK |
2773 | * @dev: the PCI device |
2774 | */ | |
c1d61c9b | 2775 | static void pci_std_enable_acs(struct pci_dev *dev) |
ae21ee65 AK |
2776 | { |
2777 | int pos; | |
2778 | u16 cap; | |
2779 | u16 ctrl; | |
2780 | ||
ae21ee65 AK |
2781 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS); |
2782 | if (!pos) | |
c1d61c9b | 2783 | return; |
ae21ee65 AK |
2784 | |
2785 | pci_read_config_word(dev, pos + PCI_ACS_CAP, &cap); | |
2786 | pci_read_config_word(dev, pos + PCI_ACS_CTRL, &ctrl); | |
2787 | ||
2788 | /* Source Validation */ | |
2789 | ctrl |= (cap & PCI_ACS_SV); | |
2790 | ||
2791 | /* P2P Request Redirect */ | |
2792 | ctrl |= (cap & PCI_ACS_RR); | |
2793 | ||
2794 | /* P2P Completion Redirect */ | |
2795 | ctrl |= (cap & PCI_ACS_CR); | |
2796 | ||
2797 | /* Upstream Forwarding */ | |
2798 | ctrl |= (cap & PCI_ACS_UF); | |
2799 | ||
2800 | pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl); | |
2c744244 AW |
2801 | } |
2802 | ||
2803 | /** | |
2804 | * pci_enable_acs - enable ACS if hardware support it | |
2805 | * @dev: the PCI device | |
2806 | */ | |
2807 | void pci_enable_acs(struct pci_dev *dev) | |
2808 | { | |
2809 | if (!pci_acs_enable) | |
2810 | return; | |
2811 | ||
c1d61c9b | 2812 | if (!pci_dev_specific_enable_acs(dev)) |
2c744244 AW |
2813 | return; |
2814 | ||
c1d61c9b | 2815 | pci_std_enable_acs(dev); |
ae21ee65 AK |
2816 | } |
2817 | ||
0a67119f AW |
2818 | static bool pci_acs_flags_enabled(struct pci_dev *pdev, u16 acs_flags) |
2819 | { | |
2820 | int pos; | |
83db7e0b | 2821 | u16 cap, ctrl; |
0a67119f AW |
2822 | |
2823 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ACS); | |
2824 | if (!pos) | |
2825 | return false; | |
2826 | ||
83db7e0b AW |
2827 | /* |
2828 | * Except for egress control, capabilities are either required | |
2829 | * or only required if controllable. Features missing from the | |
2830 | * capability field can therefore be assumed as hard-wired enabled. | |
2831 | */ | |
2832 | pci_read_config_word(pdev, pos + PCI_ACS_CAP, &cap); | |
2833 | acs_flags &= (cap | PCI_ACS_EC); | |
2834 | ||
0a67119f AW |
2835 | pci_read_config_word(pdev, pos + PCI_ACS_CTRL, &ctrl); |
2836 | return (ctrl & acs_flags) == acs_flags; | |
2837 | } | |
2838 | ||
ad805758 AW |
2839 | /** |
2840 | * pci_acs_enabled - test ACS against required flags for a given device | |
2841 | * @pdev: device to test | |
2842 | * @acs_flags: required PCI ACS flags | |
2843 | * | |
2844 | * Return true if the device supports the provided flags. Automatically | |
2845 | * filters out flags that are not implemented on multifunction devices. | |
0a67119f AW |
2846 | * |
2847 | * Note that this interface checks the effective ACS capabilities of the | |
2848 | * device rather than the actual capabilities. For instance, most single | |
2849 | * function endpoints are not required to support ACS because they have no | |
2850 | * opportunity for peer-to-peer access. We therefore return 'true' | |
2851 | * regardless of whether the device exposes an ACS capability. This makes | |
2852 | * it much easier for callers of this function to ignore the actual type | |
2853 | * or topology of the device when testing ACS support. | |
ad805758 AW |
2854 | */ |
2855 | bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags) | |
2856 | { | |
0a67119f | 2857 | int ret; |
ad805758 AW |
2858 | |
2859 | ret = pci_dev_specific_acs_enabled(pdev, acs_flags); | |
2860 | if (ret >= 0) | |
2861 | return ret > 0; | |
2862 | ||
0a67119f AW |
2863 | /* |
2864 | * Conventional PCI and PCI-X devices never support ACS, either | |
2865 | * effectively or actually. The shared bus topology implies that | |
2866 | * any device on the bus can receive or snoop DMA. | |
2867 | */ | |
ad805758 AW |
2868 | if (!pci_is_pcie(pdev)) |
2869 | return false; | |
2870 | ||
0a67119f AW |
2871 | switch (pci_pcie_type(pdev)) { |
2872 | /* | |
2873 | * PCI/X-to-PCIe bridges are not specifically mentioned by the spec, | |
f7625980 | 2874 | * but since their primary interface is PCI/X, we conservatively |
0a67119f AW |
2875 | * handle them as we would a non-PCIe device. |
2876 | */ | |
2877 | case PCI_EXP_TYPE_PCIE_BRIDGE: | |
2878 | /* | |
2879 | * PCIe 3.0, 6.12.1 excludes ACS on these devices. "ACS is never | |
2880 | * applicable... must never implement an ACS Extended Capability...". | |
2881 | * This seems arbitrary, but we take a conservative interpretation | |
2882 | * of this statement. | |
2883 | */ | |
2884 | case PCI_EXP_TYPE_PCI_BRIDGE: | |
2885 | case PCI_EXP_TYPE_RC_EC: | |
2886 | return false; | |
2887 | /* | |
2888 | * PCIe 3.0, 6.12.1.1 specifies that downstream and root ports should | |
2889 | * implement ACS in order to indicate their peer-to-peer capabilities, | |
2890 | * regardless of whether they are single- or multi-function devices. | |
2891 | */ | |
2892 | case PCI_EXP_TYPE_DOWNSTREAM: | |
2893 | case PCI_EXP_TYPE_ROOT_PORT: | |
2894 | return pci_acs_flags_enabled(pdev, acs_flags); | |
2895 | /* | |
2896 | * PCIe 3.0, 6.12.1.2 specifies ACS capabilities that should be | |
2897 | * implemented by the remaining PCIe types to indicate peer-to-peer | |
f7625980 | 2898 | * capabilities, but only when they are part of a multifunction |
0a67119f AW |
2899 | * device. The footnote for section 6.12 indicates the specific |
2900 | * PCIe types included here. | |
2901 | */ | |
2902 | case PCI_EXP_TYPE_ENDPOINT: | |
2903 | case PCI_EXP_TYPE_UPSTREAM: | |
2904 | case PCI_EXP_TYPE_LEG_END: | |
2905 | case PCI_EXP_TYPE_RC_END: | |
2906 | if (!pdev->multifunction) | |
2907 | break; | |
2908 | ||
0a67119f | 2909 | return pci_acs_flags_enabled(pdev, acs_flags); |
ad805758 AW |
2910 | } |
2911 | ||
0a67119f | 2912 | /* |
f7625980 | 2913 | * PCIe 3.0, 6.12.1.3 specifies no ACS capabilities are applicable |
0a67119f AW |
2914 | * to single function devices with the exception of downstream ports. |
2915 | */ | |
ad805758 AW |
2916 | return true; |
2917 | } | |
2918 | ||
2919 | /** | |
2920 | * pci_acs_path_enable - test ACS flags from start to end in a hierarchy | |
2921 | * @start: starting downstream device | |
2922 | * @end: ending upstream device or NULL to search to the root bus | |
2923 | * @acs_flags: required flags | |
2924 | * | |
2925 | * Walk up a device tree from start to end testing PCI ACS support. If | |
2926 | * any step along the way does not support the required flags, return false. | |
2927 | */ | |
2928 | bool pci_acs_path_enabled(struct pci_dev *start, | |
2929 | struct pci_dev *end, u16 acs_flags) | |
2930 | { | |
2931 | struct pci_dev *pdev, *parent = start; | |
2932 | ||
2933 | do { | |
2934 | pdev = parent; | |
2935 | ||
2936 | if (!pci_acs_enabled(pdev, acs_flags)) | |
2937 | return false; | |
2938 | ||
2939 | if (pci_is_root_bus(pdev->bus)) | |
2940 | return (end == NULL); | |
2941 | ||
2942 | parent = pdev->bus->self; | |
2943 | } while (pdev != end); | |
2944 | ||
2945 | return true; | |
2946 | } | |
2947 | ||
57c2cf71 BH |
2948 | /** |
2949 | * pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge | |
2950 | * @dev: the PCI device | |
bb5c2de2 | 2951 | * @pin: the INTx pin (1=INTA, 2=INTB, 3=INTC, 4=INTD) |
57c2cf71 BH |
2952 | * |
2953 | * Perform INTx swizzling for a device behind one level of bridge. This is | |
2954 | * required by section 9.1 of the PCI-to-PCI bridge specification for devices | |
46b952a3 MW |
2955 | * behind bridges on add-in cards. For devices with ARI enabled, the slot |
2956 | * number is always 0 (see the Implementation Note in section 2.2.8.1 of | |
2957 | * the PCI Express Base Specification, Revision 2.1) | |
57c2cf71 | 2958 | */ |
3df425f3 | 2959 | u8 pci_swizzle_interrupt_pin(const struct pci_dev *dev, u8 pin) |
57c2cf71 | 2960 | { |
46b952a3 MW |
2961 | int slot; |
2962 | ||
2963 | if (pci_ari_enabled(dev->bus)) | |
2964 | slot = 0; | |
2965 | else | |
2966 | slot = PCI_SLOT(dev->devfn); | |
2967 | ||
2968 | return (((pin - 1) + slot) % 4) + 1; | |
57c2cf71 BH |
2969 | } |
2970 | ||
3c78bc61 | 2971 | int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge) |
1da177e4 LT |
2972 | { |
2973 | u8 pin; | |
2974 | ||
514d207d | 2975 | pin = dev->pin; |
1da177e4 LT |
2976 | if (!pin) |
2977 | return -1; | |
878f2e50 | 2978 | |
8784fd4d | 2979 | while (!pci_is_root_bus(dev->bus)) { |
57c2cf71 | 2980 | pin = pci_swizzle_interrupt_pin(dev, pin); |
1da177e4 LT |
2981 | dev = dev->bus->self; |
2982 | } | |
2983 | *bridge = dev; | |
2984 | return pin; | |
2985 | } | |
2986 | ||
68feac87 BH |
2987 | /** |
2988 | * pci_common_swizzle - swizzle INTx all the way to root bridge | |
2989 | * @dev: the PCI device | |
2990 | * @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD) | |
2991 | * | |
2992 | * Perform INTx swizzling for a device. This traverses through all PCI-to-PCI | |
2993 | * bridges all the way up to a PCI root bus. | |
2994 | */ | |
2995 | u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp) | |
2996 | { | |
2997 | u8 pin = *pinp; | |
2998 | ||
1eb39487 | 2999 | while (!pci_is_root_bus(dev->bus)) { |
68feac87 BH |
3000 | pin = pci_swizzle_interrupt_pin(dev, pin); |
3001 | dev = dev->bus->self; | |
3002 | } | |
3003 | *pinp = pin; | |
3004 | return PCI_SLOT(dev->devfn); | |
3005 | } | |
e6b29dea | 3006 | EXPORT_SYMBOL_GPL(pci_common_swizzle); |
68feac87 | 3007 | |
1da177e4 LT |
3008 | /** |
3009 | * pci_release_region - Release a PCI bar | |
3010 | * @pdev: PCI device whose resources were previously reserved by pci_request_region | |
3011 | * @bar: BAR to release | |
3012 | * | |
3013 | * Releases the PCI I/O and memory resources previously reserved by a | |
3014 | * successful call to pci_request_region. Call this function only | |
3015 | * after all use of the PCI regions has ceased. | |
3016 | */ | |
3017 | void pci_release_region(struct pci_dev *pdev, int bar) | |
3018 | { | |
9ac7849e TH |
3019 | struct pci_devres *dr; |
3020 | ||
1da177e4 LT |
3021 | if (pci_resource_len(pdev, bar) == 0) |
3022 | return; | |
3023 | if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) | |
3024 | release_region(pci_resource_start(pdev, bar), | |
3025 | pci_resource_len(pdev, bar)); | |
3026 | else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) | |
3027 | release_mem_region(pci_resource_start(pdev, bar), | |
3028 | pci_resource_len(pdev, bar)); | |
9ac7849e TH |
3029 | |
3030 | dr = find_pci_dr(pdev); | |
3031 | if (dr) | |
3032 | dr->region_mask &= ~(1 << bar); | |
1da177e4 | 3033 | } |
b7fe9434 | 3034 | EXPORT_SYMBOL(pci_release_region); |
1da177e4 LT |
3035 | |
3036 | /** | |
f5ddcac4 | 3037 | * __pci_request_region - Reserved PCI I/O and memory resource |
1da177e4 LT |
3038 | * @pdev: PCI device whose resources are to be reserved |
3039 | * @bar: BAR to be reserved | |
3040 | * @res_name: Name to be associated with resource. | |
f5ddcac4 | 3041 | * @exclusive: whether the region access is exclusive or not |
1da177e4 LT |
3042 | * |
3043 | * Mark the PCI region associated with PCI device @pdev BR @bar as | |
3044 | * being reserved by owner @res_name. Do not access any | |
3045 | * address inside the PCI regions unless this call returns | |
3046 | * successfully. | |
3047 | * | |
f5ddcac4 RD |
3048 | * If @exclusive is set, then the region is marked so that userspace |
3049 | * is explicitly not allowed to map the resource via /dev/mem or | |
f7625980 | 3050 | * sysfs MMIO access. |
f5ddcac4 | 3051 | * |
1da177e4 LT |
3052 | * Returns 0 on success, or %EBUSY on error. A warning |
3053 | * message is also printed on failure. | |
3054 | */ | |
3c78bc61 RD |
3055 | static int __pci_request_region(struct pci_dev *pdev, int bar, |
3056 | const char *res_name, int exclusive) | |
1da177e4 | 3057 | { |
9ac7849e TH |
3058 | struct pci_devres *dr; |
3059 | ||
1da177e4 LT |
3060 | if (pci_resource_len(pdev, bar) == 0) |
3061 | return 0; | |
f7625980 | 3062 | |
1da177e4 LT |
3063 | if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) { |
3064 | if (!request_region(pci_resource_start(pdev, bar), | |
3065 | pci_resource_len(pdev, bar), res_name)) | |
3066 | goto err_out; | |
3c78bc61 | 3067 | } else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) { |
e8de1481 AV |
3068 | if (!__request_mem_region(pci_resource_start(pdev, bar), |
3069 | pci_resource_len(pdev, bar), res_name, | |
3070 | exclusive)) | |
1da177e4 LT |
3071 | goto err_out; |
3072 | } | |
9ac7849e TH |
3073 | |
3074 | dr = find_pci_dr(pdev); | |
3075 | if (dr) | |
3076 | dr->region_mask |= 1 << bar; | |
3077 | ||
1da177e4 LT |
3078 | return 0; |
3079 | ||
3080 | err_out: | |
c7dabef8 | 3081 | dev_warn(&pdev->dev, "BAR %d: can't reserve %pR\n", bar, |
096e6f67 | 3082 | &pdev->resource[bar]); |
1da177e4 LT |
3083 | return -EBUSY; |
3084 | } | |
3085 | ||
e8de1481 | 3086 | /** |
f5ddcac4 | 3087 | * pci_request_region - Reserve PCI I/O and memory resource |
e8de1481 AV |
3088 | * @pdev: PCI device whose resources are to be reserved |
3089 | * @bar: BAR to be reserved | |
f5ddcac4 | 3090 | * @res_name: Name to be associated with resource |
e8de1481 | 3091 | * |
f5ddcac4 | 3092 | * Mark the PCI region associated with PCI device @pdev BAR @bar as |
e8de1481 AV |
3093 | * being reserved by owner @res_name. Do not access any |
3094 | * address inside the PCI regions unless this call returns | |
3095 | * successfully. | |
3096 | * | |
3097 | * Returns 0 on success, or %EBUSY on error. A warning | |
3098 | * message is also printed on failure. | |
3099 | */ | |
3100 | int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name) | |
3101 | { | |
3102 | return __pci_request_region(pdev, bar, res_name, 0); | |
3103 | } | |
b7fe9434 | 3104 | EXPORT_SYMBOL(pci_request_region); |
e8de1481 AV |
3105 | |
3106 | /** | |
3107 | * pci_request_region_exclusive - Reserved PCI I/O and memory resource | |
3108 | * @pdev: PCI device whose resources are to be reserved | |
3109 | * @bar: BAR to be reserved | |
3110 | * @res_name: Name to be associated with resource. | |
3111 | * | |
3112 | * Mark the PCI region associated with PCI device @pdev BR @bar as | |
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 | * The key difference that _exclusive makes it that userspace is | |
3121 | * explicitly not allowed to map the resource via /dev/mem or | |
f7625980 | 3122 | * sysfs. |
e8de1481 | 3123 | */ |
3c78bc61 RD |
3124 | int pci_request_region_exclusive(struct pci_dev *pdev, int bar, |
3125 | const char *res_name) | |
e8de1481 AV |
3126 | { |
3127 | return __pci_request_region(pdev, bar, res_name, IORESOURCE_EXCLUSIVE); | |
3128 | } | |
b7fe9434 RD |
3129 | EXPORT_SYMBOL(pci_request_region_exclusive); |
3130 | ||
c87deff7 HS |
3131 | /** |
3132 | * pci_release_selected_regions - Release selected PCI I/O and memory resources | |
3133 | * @pdev: PCI device whose resources were previously reserved | |
3134 | * @bars: Bitmask of BARs to be released | |
3135 | * | |
3136 | * Release selected PCI I/O and memory resources previously reserved. | |
3137 | * Call this function only after all use of the PCI regions has ceased. | |
3138 | */ | |
3139 | void pci_release_selected_regions(struct pci_dev *pdev, int bars) | |
3140 | { | |
3141 | int i; | |
3142 | ||
3143 | for (i = 0; i < 6; i++) | |
3144 | if (bars & (1 << i)) | |
3145 | pci_release_region(pdev, i); | |
3146 | } | |
b7fe9434 | 3147 | EXPORT_SYMBOL(pci_release_selected_regions); |
c87deff7 | 3148 | |
9738abed | 3149 | static int __pci_request_selected_regions(struct pci_dev *pdev, int bars, |
3c78bc61 | 3150 | const char *res_name, int excl) |
c87deff7 HS |
3151 | { |
3152 | int i; | |
3153 | ||
3154 | for (i = 0; i < 6; i++) | |
3155 | if (bars & (1 << i)) | |
e8de1481 | 3156 | if (__pci_request_region(pdev, i, res_name, excl)) |
c87deff7 HS |
3157 | goto err_out; |
3158 | return 0; | |
3159 | ||
3160 | err_out: | |
3c78bc61 | 3161 | while (--i >= 0) |
c87deff7 HS |
3162 | if (bars & (1 << i)) |
3163 | pci_release_region(pdev, i); | |
3164 | ||
3165 | return -EBUSY; | |
3166 | } | |
1da177e4 | 3167 | |
e8de1481 AV |
3168 | |
3169 | /** | |
3170 | * pci_request_selected_regions - Reserve selected PCI I/O and memory resources | |
3171 | * @pdev: PCI device whose resources are to be reserved | |
3172 | * @bars: Bitmask of BARs to be requested | |
3173 | * @res_name: Name to be associated with resource | |
3174 | */ | |
3175 | int pci_request_selected_regions(struct pci_dev *pdev, int bars, | |
3176 | const char *res_name) | |
3177 | { | |
3178 | return __pci_request_selected_regions(pdev, bars, res_name, 0); | |
3179 | } | |
b7fe9434 | 3180 | EXPORT_SYMBOL(pci_request_selected_regions); |
e8de1481 | 3181 | |
3c78bc61 RD |
3182 | int pci_request_selected_regions_exclusive(struct pci_dev *pdev, int bars, |
3183 | const char *res_name) | |
e8de1481 AV |
3184 | { |
3185 | return __pci_request_selected_regions(pdev, bars, res_name, | |
3186 | IORESOURCE_EXCLUSIVE); | |
3187 | } | |
b7fe9434 | 3188 | EXPORT_SYMBOL(pci_request_selected_regions_exclusive); |
e8de1481 | 3189 | |
1da177e4 LT |
3190 | /** |
3191 | * pci_release_regions - Release reserved PCI I/O and memory resources | |
3192 | * @pdev: PCI device whose resources were previously reserved by pci_request_regions | |
3193 | * | |
3194 | * Releases all PCI I/O and memory resources previously reserved by a | |
3195 | * successful call to pci_request_regions. Call this function only | |
3196 | * after all use of the PCI regions has ceased. | |
3197 | */ | |
3198 | ||
3199 | void pci_release_regions(struct pci_dev *pdev) | |
3200 | { | |
c87deff7 | 3201 | pci_release_selected_regions(pdev, (1 << 6) - 1); |
1da177e4 | 3202 | } |
b7fe9434 | 3203 | EXPORT_SYMBOL(pci_release_regions); |
1da177e4 LT |
3204 | |
3205 | /** | |
3206 | * pci_request_regions - Reserved PCI I/O and memory resources | |
3207 | * @pdev: PCI device whose resources are to be reserved | |
3208 | * @res_name: Name to be associated with resource. | |
3209 | * | |
3210 | * Mark all PCI regions associated with PCI device @pdev as | |
3211 | * being reserved by owner @res_name. Do not access any | |
3212 | * address inside the PCI regions unless this call returns | |
3213 | * successfully. | |
3214 | * | |
3215 | * Returns 0 on success, or %EBUSY on error. A warning | |
3216 | * message is also printed on failure. | |
3217 | */ | |
3c990e92 | 3218 | int pci_request_regions(struct pci_dev *pdev, const char *res_name) |
1da177e4 | 3219 | { |
c87deff7 | 3220 | return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name); |
1da177e4 | 3221 | } |
b7fe9434 | 3222 | EXPORT_SYMBOL(pci_request_regions); |
1da177e4 | 3223 | |
e8de1481 AV |
3224 | /** |
3225 | * pci_request_regions_exclusive - Reserved PCI I/O and memory resources | |
3226 | * @pdev: PCI device whose resources are to be reserved | |
3227 | * @res_name: Name to be associated with resource. | |
3228 | * | |
3229 | * Mark all PCI regions associated with PCI device @pdev as | |
3230 | * being reserved by owner @res_name. Do not access any | |
3231 | * address inside the PCI regions unless this call returns | |
3232 | * successfully. | |
3233 | * | |
3234 | * pci_request_regions_exclusive() will mark the region so that | |
f7625980 | 3235 | * /dev/mem and the sysfs MMIO access will not be allowed. |
e8de1481 AV |
3236 | * |
3237 | * Returns 0 on success, or %EBUSY on error. A warning | |
3238 | * message is also printed on failure. | |
3239 | */ | |
3240 | int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name) | |
3241 | { | |
3242 | return pci_request_selected_regions_exclusive(pdev, | |
3243 | ((1 << 6) - 1), res_name); | |
3244 | } | |
b7fe9434 | 3245 | EXPORT_SYMBOL(pci_request_regions_exclusive); |
e8de1481 | 3246 | |
c5076cfe TN |
3247 | #ifdef PCI_IOBASE |
3248 | struct io_range { | |
3249 | struct list_head list; | |
3250 | phys_addr_t start; | |
3251 | resource_size_t size; | |
3252 | }; | |
3253 | ||
3254 | static LIST_HEAD(io_range_list); | |
3255 | static DEFINE_SPINLOCK(io_range_lock); | |
3256 | #endif | |
3257 | ||
3258 | /* | |
3259 | * Record the PCI IO range (expressed as CPU physical address + size). | |
3260 | * Return a negative value if an error has occured, zero otherwise | |
3261 | */ | |
3262 | int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size) | |
3263 | { | |
3264 | int err = 0; | |
3265 | ||
3266 | #ifdef PCI_IOBASE | |
3267 | struct io_range *range; | |
3268 | resource_size_t allocated_size = 0; | |
3269 | ||
3270 | /* check if the range hasn't been previously recorded */ | |
3271 | spin_lock(&io_range_lock); | |
3272 | list_for_each_entry(range, &io_range_list, list) { | |
3273 | if (addr >= range->start && addr + size <= range->start + size) { | |
3274 | /* range already registered, bail out */ | |
3275 | goto end_register; | |
3276 | } | |
3277 | allocated_size += range->size; | |
3278 | } | |
3279 | ||
3280 | /* range not registed yet, check for available space */ | |
3281 | if (allocated_size + size - 1 > IO_SPACE_LIMIT) { | |
3282 | /* if it's too big check if 64K space can be reserved */ | |
3283 | if (allocated_size + SZ_64K - 1 > IO_SPACE_LIMIT) { | |
3284 | err = -E2BIG; | |
3285 | goto end_register; | |
3286 | } | |
3287 | ||
3288 | size = SZ_64K; | |
3289 | pr_warn("Requested IO range too big, new size set to 64K\n"); | |
3290 | } | |
3291 | ||
3292 | /* add the range to the list */ | |
3293 | range = kzalloc(sizeof(*range), GFP_ATOMIC); | |
3294 | if (!range) { | |
3295 | err = -ENOMEM; | |
3296 | goto end_register; | |
3297 | } | |
3298 | ||
3299 | range->start = addr; | |
3300 | range->size = size; | |
3301 | ||
3302 | list_add_tail(&range->list, &io_range_list); | |
3303 | ||
3304 | end_register: | |
3305 | spin_unlock(&io_range_lock); | |
3306 | #endif | |
3307 | ||
3308 | return err; | |
3309 | } | |
3310 | ||
3311 | phys_addr_t pci_pio_to_address(unsigned long pio) | |
3312 | { | |
3313 | phys_addr_t address = (phys_addr_t)OF_BAD_ADDR; | |
3314 | ||
3315 | #ifdef PCI_IOBASE | |
3316 | struct io_range *range; | |
3317 | resource_size_t allocated_size = 0; | |
3318 | ||
3319 | if (pio > IO_SPACE_LIMIT) | |
3320 | return address; | |
3321 | ||
3322 | spin_lock(&io_range_lock); | |
3323 | list_for_each_entry(range, &io_range_list, list) { | |
3324 | if (pio >= allocated_size && pio < allocated_size + range->size) { | |
3325 | address = range->start + pio - allocated_size; | |
3326 | break; | |
3327 | } | |
3328 | allocated_size += range->size; | |
3329 | } | |
3330 | spin_unlock(&io_range_lock); | |
3331 | #endif | |
3332 | ||
3333 | return address; | |
3334 | } | |
3335 | ||
3336 | unsigned long __weak pci_address_to_pio(phys_addr_t address) | |
3337 | { | |
3338 | #ifdef PCI_IOBASE | |
3339 | struct io_range *res; | |
3340 | resource_size_t offset = 0; | |
3341 | unsigned long addr = -1; | |
3342 | ||
3343 | spin_lock(&io_range_lock); | |
3344 | list_for_each_entry(res, &io_range_list, list) { | |
3345 | if (address >= res->start && address < res->start + res->size) { | |
3346 | addr = address - res->start + offset; | |
3347 | break; | |
3348 | } | |
3349 | offset += res->size; | |
3350 | } | |
3351 | spin_unlock(&io_range_lock); | |
3352 | ||
3353 | return addr; | |
3354 | #else | |
3355 | if (address > IO_SPACE_LIMIT) | |
3356 | return (unsigned long)-1; | |
3357 | ||
3358 | return (unsigned long) address; | |
3359 | #endif | |
3360 | } | |
3361 | ||
8b921acf LD |
3362 | /** |
3363 | * pci_remap_iospace - Remap the memory mapped I/O space | |
3364 | * @res: Resource describing the I/O space | |
3365 | * @phys_addr: physical address of range to be mapped | |
3366 | * | |
3367 | * Remap the memory mapped I/O space described by the @res | |
3368 | * and the CPU physical address @phys_addr into virtual address space. | |
3369 | * Only architectures that have memory mapped IO functions defined | |
3370 | * (and the PCI_IOBASE value defined) should call this function. | |
3371 | */ | |
7b309aef | 3372 | int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr) |
8b921acf LD |
3373 | { |
3374 | #if defined(PCI_IOBASE) && defined(CONFIG_MMU) | |
3375 | unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start; | |
3376 | ||
3377 | if (!(res->flags & IORESOURCE_IO)) | |
3378 | return -EINVAL; | |
3379 | ||
3380 | if (res->end > IO_SPACE_LIMIT) | |
3381 | return -EINVAL; | |
3382 | ||
3383 | return ioremap_page_range(vaddr, vaddr + resource_size(res), phys_addr, | |
3384 | pgprot_device(PAGE_KERNEL)); | |
3385 | #else | |
3386 | /* this architecture does not have memory mapped I/O space, | |
3387 | so this function should never be called */ | |
3388 | WARN_ONCE(1, "This architecture does not support memory mapped I/O\n"); | |
3389 | return -ENODEV; | |
3390 | #endif | |
3391 | } | |
f90b0875 | 3392 | EXPORT_SYMBOL(pci_remap_iospace); |
8b921acf | 3393 | |
4d3f1384 SK |
3394 | /** |
3395 | * pci_unmap_iospace - Unmap the memory mapped I/O space | |
3396 | * @res: resource to be unmapped | |
3397 | * | |
3398 | * Unmap the CPU virtual address @res from virtual address space. | |
3399 | * Only architectures that have memory mapped IO functions defined | |
3400 | * (and the PCI_IOBASE value defined) should call this function. | |
3401 | */ | |
3402 | void pci_unmap_iospace(struct resource *res) | |
3403 | { | |
3404 | #if defined(PCI_IOBASE) && defined(CONFIG_MMU) | |
3405 | unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start; | |
3406 | ||
3407 | unmap_kernel_range(vaddr, resource_size(res)); | |
3408 | #endif | |
3409 | } | |
f90b0875 | 3410 | EXPORT_SYMBOL(pci_unmap_iospace); |
4d3f1384 | 3411 | |
490cb6dd LP |
3412 | /** |
3413 | * devm_pci_remap_cfgspace - Managed pci_remap_cfgspace() | |
3414 | * @dev: Generic device to remap IO address for | |
3415 | * @offset: Resource address to map | |
3416 | * @size: Size of map | |
3417 | * | |
3418 | * Managed pci_remap_cfgspace(). Map is automatically unmapped on driver | |
3419 | * detach. | |
3420 | */ | |
3421 | void __iomem *devm_pci_remap_cfgspace(struct device *dev, | |
3422 | resource_size_t offset, | |
3423 | resource_size_t size) | |
3424 | { | |
3425 | void __iomem **ptr, *addr; | |
3426 | ||
3427 | ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL); | |
3428 | if (!ptr) | |
3429 | return NULL; | |
3430 | ||
3431 | addr = pci_remap_cfgspace(offset, size); | |
3432 | if (addr) { | |
3433 | *ptr = addr; | |
3434 | devres_add(dev, ptr); | |
3435 | } else | |
3436 | devres_free(ptr); | |
3437 | ||
3438 | return addr; | |
3439 | } | |
3440 | EXPORT_SYMBOL(devm_pci_remap_cfgspace); | |
3441 | ||
3442 | /** | |
3443 | * devm_pci_remap_cfg_resource - check, request region and ioremap cfg resource | |
3444 | * @dev: generic device to handle the resource for | |
3445 | * @res: configuration space resource to be handled | |
3446 | * | |
3447 | * Checks that a resource is a valid memory region, requests the memory | |
3448 | * region and ioremaps with pci_remap_cfgspace() API that ensures the | |
3449 | * proper PCI configuration space memory attributes are guaranteed. | |
3450 | * | |
3451 | * All operations are managed and will be undone on driver detach. | |
3452 | * | |
3453 | * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code | |
3454 | * on failure. Usage example: | |
3455 | * | |
3456 | * res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
3457 | * base = devm_pci_remap_cfg_resource(&pdev->dev, res); | |
3458 | * if (IS_ERR(base)) | |
3459 | * return PTR_ERR(base); | |
3460 | */ | |
3461 | void __iomem *devm_pci_remap_cfg_resource(struct device *dev, | |
3462 | struct resource *res) | |
3463 | { | |
3464 | resource_size_t size; | |
3465 | const char *name; | |
3466 | void __iomem *dest_ptr; | |
3467 | ||
3468 | BUG_ON(!dev); | |
3469 | ||
3470 | if (!res || resource_type(res) != IORESOURCE_MEM) { | |
3471 | dev_err(dev, "invalid resource\n"); | |
3472 | return IOMEM_ERR_PTR(-EINVAL); | |
3473 | } | |
3474 | ||
3475 | size = resource_size(res); | |
3476 | name = res->name ?: dev_name(dev); | |
3477 | ||
3478 | if (!devm_request_mem_region(dev, res->start, size, name)) { | |
3479 | dev_err(dev, "can't request region for resource %pR\n", res); | |
3480 | return IOMEM_ERR_PTR(-EBUSY); | |
3481 | } | |
3482 | ||
3483 | dest_ptr = devm_pci_remap_cfgspace(dev, res->start, size); | |
3484 | if (!dest_ptr) { | |
3485 | dev_err(dev, "ioremap failed for resource %pR\n", res); | |
3486 | devm_release_mem_region(dev, res->start, size); | |
3487 | dest_ptr = IOMEM_ERR_PTR(-ENOMEM); | |
3488 | } | |
3489 | ||
3490 | return dest_ptr; | |
3491 | } | |
3492 | EXPORT_SYMBOL(devm_pci_remap_cfg_resource); | |
3493 | ||
6a479079 BH |
3494 | static void __pci_set_master(struct pci_dev *dev, bool enable) |
3495 | { | |
3496 | u16 old_cmd, cmd; | |
3497 | ||
3498 | pci_read_config_word(dev, PCI_COMMAND, &old_cmd); | |
3499 | if (enable) | |
3500 | cmd = old_cmd | PCI_COMMAND_MASTER; | |
3501 | else | |
3502 | cmd = old_cmd & ~PCI_COMMAND_MASTER; | |
3503 | if (cmd != old_cmd) { | |
3504 | dev_dbg(&dev->dev, "%s bus mastering\n", | |
3505 | enable ? "enabling" : "disabling"); | |
3506 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
3507 | } | |
3508 | dev->is_busmaster = enable; | |
3509 | } | |
e8de1481 | 3510 | |
2b6f2c35 MS |
3511 | /** |
3512 | * pcibios_setup - process "pci=" kernel boot arguments | |
3513 | * @str: string used to pass in "pci=" kernel boot arguments | |
3514 | * | |
3515 | * Process kernel boot arguments. This is the default implementation. | |
3516 | * Architecture specific implementations can override this as necessary. | |
3517 | */ | |
3518 | char * __weak __init pcibios_setup(char *str) | |
3519 | { | |
3520 | return str; | |
3521 | } | |
3522 | ||
96c55900 MS |
3523 | /** |
3524 | * pcibios_set_master - enable PCI bus-mastering for device dev | |
3525 | * @dev: the PCI device to enable | |
3526 | * | |
3527 | * Enables PCI bus-mastering for the device. This is the default | |
3528 | * implementation. Architecture specific implementations can override | |
3529 | * this if necessary. | |
3530 | */ | |
3531 | void __weak pcibios_set_master(struct pci_dev *dev) | |
3532 | { | |
3533 | u8 lat; | |
3534 | ||
f676678f MS |
3535 | /* The latency timer doesn't apply to PCIe (either Type 0 or Type 1) */ |
3536 | if (pci_is_pcie(dev)) | |
3537 | return; | |
3538 | ||
96c55900 MS |
3539 | pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat); |
3540 | if (lat < 16) | |
3541 | lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency; | |
3542 | else if (lat > pcibios_max_latency) | |
3543 | lat = pcibios_max_latency; | |
3544 | else | |
3545 | return; | |
a006482b | 3546 | |
96c55900 MS |
3547 | pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat); |
3548 | } | |
3549 | ||
1da177e4 LT |
3550 | /** |
3551 | * pci_set_master - enables bus-mastering for device dev | |
3552 | * @dev: the PCI device to enable | |
3553 | * | |
3554 | * Enables bus-mastering on the device and calls pcibios_set_master() | |
3555 | * to do the needed arch specific settings. | |
3556 | */ | |
6a479079 | 3557 | void pci_set_master(struct pci_dev *dev) |
1da177e4 | 3558 | { |
6a479079 | 3559 | __pci_set_master(dev, true); |
1da177e4 LT |
3560 | pcibios_set_master(dev); |
3561 | } | |
b7fe9434 | 3562 | EXPORT_SYMBOL(pci_set_master); |
1da177e4 | 3563 | |
6a479079 BH |
3564 | /** |
3565 | * pci_clear_master - disables bus-mastering for device dev | |
3566 | * @dev: the PCI device to disable | |
3567 | */ | |
3568 | void pci_clear_master(struct pci_dev *dev) | |
3569 | { | |
3570 | __pci_set_master(dev, false); | |
3571 | } | |
b7fe9434 | 3572 | EXPORT_SYMBOL(pci_clear_master); |
6a479079 | 3573 | |
1da177e4 | 3574 | /** |
edb2d97e MW |
3575 | * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed |
3576 | * @dev: the PCI device for which MWI is to be enabled | |
1da177e4 | 3577 | * |
edb2d97e MW |
3578 | * Helper function for pci_set_mwi. |
3579 | * Originally copied from drivers/net/acenic.c. | |
1da177e4 LT |
3580 | * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>. |
3581 | * | |
3582 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
3583 | */ | |
15ea76d4 | 3584 | int pci_set_cacheline_size(struct pci_dev *dev) |
1da177e4 LT |
3585 | { |
3586 | u8 cacheline_size; | |
3587 | ||
3588 | if (!pci_cache_line_size) | |
15ea76d4 | 3589 | return -EINVAL; |
1da177e4 LT |
3590 | |
3591 | /* Validate current setting: the PCI_CACHE_LINE_SIZE must be | |
3592 | equal to or multiple of the right value. */ | |
3593 | pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size); | |
3594 | if (cacheline_size >= pci_cache_line_size && | |
3595 | (cacheline_size % pci_cache_line_size) == 0) | |
3596 | return 0; | |
3597 | ||
3598 | /* Write the correct value. */ | |
3599 | pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size); | |
3600 | /* Read it back. */ | |
3601 | pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size); | |
3602 | if (cacheline_size == pci_cache_line_size) | |
3603 | return 0; | |
3604 | ||
227f0647 RD |
3605 | dev_printk(KERN_DEBUG, &dev->dev, "cache line size of %d is not supported\n", |
3606 | pci_cache_line_size << 2); | |
1da177e4 LT |
3607 | |
3608 | return -EINVAL; | |
3609 | } | |
15ea76d4 TH |
3610 | EXPORT_SYMBOL_GPL(pci_set_cacheline_size); |
3611 | ||
1da177e4 LT |
3612 | /** |
3613 | * pci_set_mwi - enables memory-write-invalidate PCI transaction | |
3614 | * @dev: the PCI device for which MWI is enabled | |
3615 | * | |
694625c0 | 3616 | * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND. |
1da177e4 LT |
3617 | * |
3618 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
3619 | */ | |
3c78bc61 | 3620 | int pci_set_mwi(struct pci_dev *dev) |
1da177e4 | 3621 | { |
b7fe9434 RD |
3622 | #ifdef PCI_DISABLE_MWI |
3623 | return 0; | |
3624 | #else | |
1da177e4 LT |
3625 | int rc; |
3626 | u16 cmd; | |
3627 | ||
edb2d97e | 3628 | rc = pci_set_cacheline_size(dev); |
1da177e4 LT |
3629 | if (rc) |
3630 | return rc; | |
3631 | ||
3632 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
3c78bc61 | 3633 | if (!(cmd & PCI_COMMAND_INVALIDATE)) { |
80ccba11 | 3634 | dev_dbg(&dev->dev, "enabling Mem-Wr-Inval\n"); |
1da177e4 LT |
3635 | cmd |= PCI_COMMAND_INVALIDATE; |
3636 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
3637 | } | |
1da177e4 | 3638 | return 0; |
b7fe9434 | 3639 | #endif |
1da177e4 | 3640 | } |
b7fe9434 | 3641 | EXPORT_SYMBOL(pci_set_mwi); |
1da177e4 | 3642 | |
694625c0 RD |
3643 | /** |
3644 | * pci_try_set_mwi - enables memory-write-invalidate PCI transaction | |
3645 | * @dev: the PCI device for which MWI is enabled | |
3646 | * | |
3647 | * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND. | |
3648 | * Callers are not required to check the return value. | |
3649 | * | |
3650 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
3651 | */ | |
3652 | int pci_try_set_mwi(struct pci_dev *dev) | |
3653 | { | |
b7fe9434 RD |
3654 | #ifdef PCI_DISABLE_MWI |
3655 | return 0; | |
3656 | #else | |
3657 | return pci_set_mwi(dev); | |
3658 | #endif | |
694625c0 | 3659 | } |
b7fe9434 | 3660 | EXPORT_SYMBOL(pci_try_set_mwi); |
694625c0 | 3661 | |
1da177e4 LT |
3662 | /** |
3663 | * pci_clear_mwi - disables Memory-Write-Invalidate for device dev | |
3664 | * @dev: the PCI device to disable | |
3665 | * | |
3666 | * Disables PCI Memory-Write-Invalidate transaction on the device | |
3667 | */ | |
3c78bc61 | 3668 | void pci_clear_mwi(struct pci_dev *dev) |
1da177e4 | 3669 | { |
b7fe9434 | 3670 | #ifndef PCI_DISABLE_MWI |
1da177e4 LT |
3671 | u16 cmd; |
3672 | ||
3673 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
3674 | if (cmd & PCI_COMMAND_INVALIDATE) { | |
3675 | cmd &= ~PCI_COMMAND_INVALIDATE; | |
3676 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
3677 | } | |
b7fe9434 | 3678 | #endif |
1da177e4 | 3679 | } |
b7fe9434 | 3680 | EXPORT_SYMBOL(pci_clear_mwi); |
1da177e4 | 3681 | |
a04ce0ff BR |
3682 | /** |
3683 | * pci_intx - enables/disables PCI INTx for device dev | |
8f7020d3 RD |
3684 | * @pdev: the PCI device to operate on |
3685 | * @enable: boolean: whether to enable or disable PCI INTx | |
a04ce0ff BR |
3686 | * |
3687 | * Enables/disables PCI INTx for device dev | |
3688 | */ | |
3c78bc61 | 3689 | void pci_intx(struct pci_dev *pdev, int enable) |
a04ce0ff BR |
3690 | { |
3691 | u16 pci_command, new; | |
3692 | ||
3693 | pci_read_config_word(pdev, PCI_COMMAND, &pci_command); | |
3694 | ||
3c78bc61 | 3695 | if (enable) |
a04ce0ff | 3696 | new = pci_command & ~PCI_COMMAND_INTX_DISABLE; |
3c78bc61 | 3697 | else |
a04ce0ff | 3698 | new = pci_command | PCI_COMMAND_INTX_DISABLE; |
a04ce0ff BR |
3699 | |
3700 | if (new != pci_command) { | |
9ac7849e TH |
3701 | struct pci_devres *dr; |
3702 | ||
2fd9d74b | 3703 | pci_write_config_word(pdev, PCI_COMMAND, new); |
9ac7849e TH |
3704 | |
3705 | dr = find_pci_dr(pdev); | |
3706 | if (dr && !dr->restore_intx) { | |
3707 | dr->restore_intx = 1; | |
3708 | dr->orig_intx = !enable; | |
3709 | } | |
a04ce0ff BR |
3710 | } |
3711 | } | |
b7fe9434 | 3712 | EXPORT_SYMBOL_GPL(pci_intx); |
a04ce0ff | 3713 | |
a2e27787 JK |
3714 | /** |
3715 | * pci_intx_mask_supported - probe for INTx masking support | |
6e9292c5 | 3716 | * @dev: the PCI device to operate on |
a2e27787 JK |
3717 | * |
3718 | * Check if the device dev support INTx masking via the config space | |
3719 | * command word. | |
3720 | */ | |
3721 | bool pci_intx_mask_supported(struct pci_dev *dev) | |
3722 | { | |
3723 | bool mask_supported = false; | |
3724 | u16 orig, new; | |
3725 | ||
fbebb9fd BH |
3726 | if (dev->broken_intx_masking) |
3727 | return false; | |
3728 | ||
a2e27787 JK |
3729 | pci_cfg_access_lock(dev); |
3730 | ||
3731 | pci_read_config_word(dev, PCI_COMMAND, &orig); | |
3732 | pci_write_config_word(dev, PCI_COMMAND, | |
3733 | orig ^ PCI_COMMAND_INTX_DISABLE); | |
3734 | pci_read_config_word(dev, PCI_COMMAND, &new); | |
3735 | ||
3736 | /* | |
3737 | * There's no way to protect against hardware bugs or detect them | |
3738 | * reliably, but as long as we know what the value should be, let's | |
3739 | * go ahead and check it. | |
3740 | */ | |
3741 | if ((new ^ orig) & ~PCI_COMMAND_INTX_DISABLE) { | |
227f0647 RD |
3742 | dev_err(&dev->dev, "Command register changed from 0x%x to 0x%x: driver or hardware bug?\n", |
3743 | orig, new); | |
a2e27787 JK |
3744 | } else if ((new ^ orig) & PCI_COMMAND_INTX_DISABLE) { |
3745 | mask_supported = true; | |
3746 | pci_write_config_word(dev, PCI_COMMAND, orig); | |
3747 | } | |
3748 | ||
3749 | pci_cfg_access_unlock(dev); | |
3750 | return mask_supported; | |
3751 | } | |
3752 | EXPORT_SYMBOL_GPL(pci_intx_mask_supported); | |
3753 | ||
3754 | static bool pci_check_and_set_intx_mask(struct pci_dev *dev, bool mask) | |
3755 | { | |
3756 | struct pci_bus *bus = dev->bus; | |
3757 | bool mask_updated = true; | |
3758 | u32 cmd_status_dword; | |
3759 | u16 origcmd, newcmd; | |
3760 | unsigned long flags; | |
3761 | bool irq_pending; | |
3762 | ||
3763 | /* | |
3764 | * We do a single dword read to retrieve both command and status. | |
3765 | * Document assumptions that make this possible. | |
3766 | */ | |
3767 | BUILD_BUG_ON(PCI_COMMAND % 4); | |
3768 | BUILD_BUG_ON(PCI_COMMAND + 2 != PCI_STATUS); | |
3769 | ||
3770 | raw_spin_lock_irqsave(&pci_lock, flags); | |
3771 | ||
3772 | bus->ops->read(bus, dev->devfn, PCI_COMMAND, 4, &cmd_status_dword); | |
3773 | ||
3774 | irq_pending = (cmd_status_dword >> 16) & PCI_STATUS_INTERRUPT; | |
3775 | ||
3776 | /* | |
3777 | * Check interrupt status register to see whether our device | |
3778 | * triggered the interrupt (when masking) or the next IRQ is | |
3779 | * already pending (when unmasking). | |
3780 | */ | |
3781 | if (mask != irq_pending) { | |
3782 | mask_updated = false; | |
3783 | goto done; | |
3784 | } | |
3785 | ||
3786 | origcmd = cmd_status_dword; | |
3787 | newcmd = origcmd & ~PCI_COMMAND_INTX_DISABLE; | |
3788 | if (mask) | |
3789 | newcmd |= PCI_COMMAND_INTX_DISABLE; | |
3790 | if (newcmd != origcmd) | |
3791 | bus->ops->write(bus, dev->devfn, PCI_COMMAND, 2, newcmd); | |
3792 | ||
3793 | done: | |
3794 | raw_spin_unlock_irqrestore(&pci_lock, flags); | |
3795 | ||
3796 | return mask_updated; | |
3797 | } | |
3798 | ||
3799 | /** | |
3800 | * pci_check_and_mask_intx - mask INTx on pending interrupt | |
6e9292c5 | 3801 | * @dev: the PCI device to operate on |
a2e27787 JK |
3802 | * |
3803 | * Check if the device dev has its INTx line asserted, mask it and | |
3804 | * return true in that case. False is returned if not interrupt was | |
3805 | * pending. | |
3806 | */ | |
3807 | bool pci_check_and_mask_intx(struct pci_dev *dev) | |
3808 | { | |
3809 | return pci_check_and_set_intx_mask(dev, true); | |
3810 | } | |
3811 | EXPORT_SYMBOL_GPL(pci_check_and_mask_intx); | |
3812 | ||
3813 | /** | |
ebd50b93 | 3814 | * pci_check_and_unmask_intx - unmask INTx if no interrupt is pending |
6e9292c5 | 3815 | * @dev: the PCI device to operate on |
a2e27787 JK |
3816 | * |
3817 | * Check if the device dev has its INTx line asserted, unmask it if not | |
3818 | * and return true. False is returned and the mask remains active if | |
3819 | * there was still an interrupt pending. | |
3820 | */ | |
3821 | bool pci_check_and_unmask_intx(struct pci_dev *dev) | |
3822 | { | |
3823 | return pci_check_and_set_intx_mask(dev, false); | |
3824 | } | |
3825 | EXPORT_SYMBOL_GPL(pci_check_and_unmask_intx); | |
3826 | ||
3775a209 CL |
3827 | /** |
3828 | * pci_wait_for_pending_transaction - waits for pending transaction | |
3829 | * @dev: the PCI device to operate on | |
3830 | * | |
3831 | * Return 0 if transaction is pending 1 otherwise. | |
3832 | */ | |
3833 | int pci_wait_for_pending_transaction(struct pci_dev *dev) | |
8dd7f803 | 3834 | { |
157e876f AW |
3835 | if (!pci_is_pcie(dev)) |
3836 | return 1; | |
8c1c699f | 3837 | |
d0b4cc4e GS |
3838 | return pci_wait_for_pending(dev, pci_pcie_cap(dev) + PCI_EXP_DEVSTA, |
3839 | PCI_EXP_DEVSTA_TRPND); | |
3775a209 CL |
3840 | } |
3841 | EXPORT_SYMBOL(pci_wait_for_pending_transaction); | |
3842 | ||
5adecf81 AW |
3843 | /* |
3844 | * We should only need to wait 100ms after FLR, but some devices take longer. | |
3845 | * Wait for up to 1000ms for config space to return something other than -1. | |
3846 | * Intel IGD requires this when an LCD panel is attached. We read the 2nd | |
3847 | * dword because VFs don't implement the 1st dword. | |
3848 | */ | |
3849 | static void pci_flr_wait(struct pci_dev *dev) | |
3850 | { | |
3851 | int i = 0; | |
3852 | u32 id; | |
3853 | ||
3854 | do { | |
3855 | msleep(100); | |
3856 | pci_read_config_dword(dev, PCI_COMMAND, &id); | |
3857 | } while (i++ < 10 && id == ~0); | |
3858 | ||
3859 | if (id == ~0) | |
3860 | dev_warn(&dev->dev, "Failed to return from FLR\n"); | |
3861 | else if (i > 1) | |
3862 | dev_info(&dev->dev, "Required additional %dms to return from FLR\n", | |
3863 | (i - 1) * 100); | |
3864 | } | |
3865 | ||
a60a2b73 CH |
3866 | /** |
3867 | * pcie_has_flr - check if a device supports function level resets | |
3868 | * @dev: device to check | |
3869 | * | |
3870 | * Returns true if the device advertises support for PCIe function level | |
3871 | * resets. | |
3872 | */ | |
3873 | static bool pcie_has_flr(struct pci_dev *dev) | |
3775a209 CL |
3874 | { |
3875 | u32 cap; | |
3876 | ||
f65fd1aa | 3877 | if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET) |
a60a2b73 | 3878 | return false; |
3775a209 | 3879 | |
a60a2b73 CH |
3880 | pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap); |
3881 | return cap & PCI_EXP_DEVCAP_FLR; | |
3882 | } | |
3775a209 | 3883 | |
a60a2b73 CH |
3884 | /** |
3885 | * pcie_flr - initiate a PCIe function level reset | |
3886 | * @dev: device to reset | |
3887 | * | |
3888 | * Initiate a function level reset on @dev. The caller should ensure the | |
3889 | * device supports FLR before calling this function, e.g. by using the | |
3890 | * pcie_has_flr() helper. | |
3891 | */ | |
3892 | void pcie_flr(struct pci_dev *dev) | |
3893 | { | |
3775a209 | 3894 | if (!pci_wait_for_pending_transaction(dev)) |
bb383e28 | 3895 | dev_err(&dev->dev, "timed out waiting for pending transaction; performing function level reset anyway\n"); |
8c1c699f | 3896 | |
59875ae4 | 3897 | pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_BCR_FLR); |
5adecf81 | 3898 | pci_flr_wait(dev); |
8dd7f803 | 3899 | } |
a60a2b73 | 3900 | EXPORT_SYMBOL_GPL(pcie_flr); |
d91cdc74 | 3901 | |
8c1c699f | 3902 | static int pci_af_flr(struct pci_dev *dev, int probe) |
1ca88797 | 3903 | { |
8c1c699f | 3904 | int pos; |
1ca88797 SY |
3905 | u8 cap; |
3906 | ||
8c1c699f YZ |
3907 | pos = pci_find_capability(dev, PCI_CAP_ID_AF); |
3908 | if (!pos) | |
1ca88797 | 3909 | return -ENOTTY; |
8c1c699f | 3910 | |
f65fd1aa SN |
3911 | if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET) |
3912 | return -ENOTTY; | |
3913 | ||
8c1c699f | 3914 | pci_read_config_byte(dev, pos + PCI_AF_CAP, &cap); |
1ca88797 SY |
3915 | if (!(cap & PCI_AF_CAP_TP) || !(cap & PCI_AF_CAP_FLR)) |
3916 | return -ENOTTY; | |
3917 | ||
3918 | if (probe) | |
3919 | return 0; | |
3920 | ||
d066c946 AW |
3921 | /* |
3922 | * Wait for Transaction Pending bit to clear. A word-aligned test | |
3923 | * is used, so we use the conrol offset rather than status and shift | |
3924 | * the test bit to match. | |
3925 | */ | |
bb383e28 | 3926 | if (!pci_wait_for_pending(dev, pos + PCI_AF_CTRL, |
d066c946 | 3927 | PCI_AF_STATUS_TP << 8)) |
bb383e28 | 3928 | dev_err(&dev->dev, "timed out waiting for pending transaction; performing AF function level reset anyway\n"); |
5fe5db05 | 3929 | |
8c1c699f | 3930 | pci_write_config_byte(dev, pos + PCI_AF_CTRL, PCI_AF_CTRL_FLR); |
5adecf81 | 3931 | pci_flr_wait(dev); |
1ca88797 SY |
3932 | return 0; |
3933 | } | |
3934 | ||
83d74e03 RW |
3935 | /** |
3936 | * pci_pm_reset - Put device into PCI_D3 and back into PCI_D0. | |
3937 | * @dev: Device to reset. | |
3938 | * @probe: If set, only check if the device can be reset this way. | |
3939 | * | |
3940 | * If @dev supports native PCI PM and its PCI_PM_CTRL_NO_SOFT_RESET flag is | |
3941 | * unset, it will be reinitialized internally when going from PCI_D3hot to | |
3942 | * PCI_D0. If that's the case and the device is not in a low-power state | |
3943 | * already, force it into PCI_D3hot and back to PCI_D0, causing it to be reset. | |
3944 | * | |
3945 | * NOTE: This causes the caller to sleep for twice the device power transition | |
3946 | * cooldown period, which for the D0->D3hot and D3hot->D0 transitions is 10 ms | |
f7625980 | 3947 | * by default (i.e. unless the @dev's d3_delay field has a different value). |
83d74e03 RW |
3948 | * Moreover, only devices in D0 can be reset by this function. |
3949 | */ | |
f85876ba | 3950 | static int pci_pm_reset(struct pci_dev *dev, int probe) |
d91cdc74 | 3951 | { |
f85876ba YZ |
3952 | u16 csr; |
3953 | ||
51e53738 | 3954 | if (!dev->pm_cap || dev->dev_flags & PCI_DEV_FLAGS_NO_PM_RESET) |
f85876ba | 3955 | return -ENOTTY; |
d91cdc74 | 3956 | |
f85876ba YZ |
3957 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &csr); |
3958 | if (csr & PCI_PM_CTRL_NO_SOFT_RESET) | |
3959 | return -ENOTTY; | |
d91cdc74 | 3960 | |
f85876ba YZ |
3961 | if (probe) |
3962 | return 0; | |
1ca88797 | 3963 | |
f85876ba YZ |
3964 | if (dev->current_state != PCI_D0) |
3965 | return -EINVAL; | |
3966 | ||
3967 | csr &= ~PCI_PM_CTRL_STATE_MASK; | |
3968 | csr |= PCI_D3hot; | |
3969 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, csr); | |
1ae861e6 | 3970 | pci_dev_d3_sleep(dev); |
f85876ba YZ |
3971 | |
3972 | csr &= ~PCI_PM_CTRL_STATE_MASK; | |
3973 | csr |= PCI_D0; | |
3974 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, csr); | |
1ae861e6 | 3975 | pci_dev_d3_sleep(dev); |
f85876ba YZ |
3976 | |
3977 | return 0; | |
3978 | } | |
3979 | ||
9e33002f | 3980 | void pci_reset_secondary_bus(struct pci_dev *dev) |
c12ff1df YZ |
3981 | { |
3982 | u16 ctrl; | |
64e8674f AW |
3983 | |
3984 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &ctrl); | |
3985 | ctrl |= PCI_BRIDGE_CTL_BUS_RESET; | |
3986 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, ctrl); | |
de0c548c AW |
3987 | /* |
3988 | * PCI spec v3.0 7.6.4.2 requires minimum Trst of 1ms. Double | |
f7625980 | 3989 | * this to 2ms to ensure that we meet the minimum requirement. |
de0c548c AW |
3990 | */ |
3991 | msleep(2); | |
64e8674f AW |
3992 | |
3993 | ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET; | |
3994 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, ctrl); | |
de0c548c AW |
3995 | |
3996 | /* | |
3997 | * Trhfa for conventional PCI is 2^25 clock cycles. | |
3998 | * Assuming a minimum 33MHz clock this results in a 1s | |
3999 | * delay before we can consider subordinate devices to | |
4000 | * be re-initialized. PCIe has some ways to shorten this, | |
4001 | * but we don't make use of them yet. | |
4002 | */ | |
4003 | ssleep(1); | |
64e8674f | 4004 | } |
d92a208d | 4005 | |
9e33002f GS |
4006 | void __weak pcibios_reset_secondary_bus(struct pci_dev *dev) |
4007 | { | |
4008 | pci_reset_secondary_bus(dev); | |
4009 | } | |
4010 | ||
d92a208d GS |
4011 | /** |
4012 | * pci_reset_bridge_secondary_bus - Reset the secondary bus on a PCI bridge. | |
4013 | * @dev: Bridge device | |
4014 | * | |
4015 | * Use the bridge control register to assert reset on the secondary bus. | |
4016 | * Devices on the secondary bus are left in power-on state. | |
4017 | */ | |
4018 | void pci_reset_bridge_secondary_bus(struct pci_dev *dev) | |
4019 | { | |
4020 | pcibios_reset_secondary_bus(dev); | |
4021 | } | |
64e8674f AW |
4022 | EXPORT_SYMBOL_GPL(pci_reset_bridge_secondary_bus); |
4023 | ||
4024 | static int pci_parent_bus_reset(struct pci_dev *dev, int probe) | |
4025 | { | |
c12ff1df YZ |
4026 | struct pci_dev *pdev; |
4027 | ||
f331a859 AW |
4028 | if (pci_is_root_bus(dev->bus) || dev->subordinate || |
4029 | !dev->bus->self || dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET) | |
c12ff1df YZ |
4030 | return -ENOTTY; |
4031 | ||
4032 | list_for_each_entry(pdev, &dev->bus->devices, bus_list) | |
4033 | if (pdev != dev) | |
4034 | return -ENOTTY; | |
4035 | ||
4036 | if (probe) | |
4037 | return 0; | |
4038 | ||
64e8674f | 4039 | pci_reset_bridge_secondary_bus(dev->bus->self); |
c12ff1df YZ |
4040 | |
4041 | return 0; | |
4042 | } | |
4043 | ||
608c3881 AW |
4044 | static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, int probe) |
4045 | { | |
4046 | int rc = -ENOTTY; | |
4047 | ||
4048 | if (!hotplug || !try_module_get(hotplug->ops->owner)) | |
4049 | return rc; | |
4050 | ||
4051 | if (hotplug->ops->reset_slot) | |
4052 | rc = hotplug->ops->reset_slot(hotplug, probe); | |
4053 | ||
4054 | module_put(hotplug->ops->owner); | |
4055 | ||
4056 | return rc; | |
4057 | } | |
4058 | ||
4059 | static int pci_dev_reset_slot_function(struct pci_dev *dev, int probe) | |
4060 | { | |
4061 | struct pci_dev *pdev; | |
4062 | ||
f331a859 AW |
4063 | if (dev->subordinate || !dev->slot || |
4064 | dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET) | |
608c3881 AW |
4065 | return -ENOTTY; |
4066 | ||
4067 | list_for_each_entry(pdev, &dev->bus->devices, bus_list) | |
4068 | if (pdev != dev && pdev->slot == dev->slot) | |
4069 | return -ENOTTY; | |
4070 | ||
4071 | return pci_reset_hotplug_slot(dev->slot->hotplug, probe); | |
4072 | } | |
4073 | ||
977f857c | 4074 | static int __pci_dev_reset(struct pci_dev *dev, int probe) |
d91cdc74 | 4075 | { |
8c1c699f YZ |
4076 | int rc; |
4077 | ||
4078 | might_sleep(); | |
4079 | ||
b9c3b266 DC |
4080 | rc = pci_dev_specific_reset(dev, probe); |
4081 | if (rc != -ENOTTY) | |
4082 | goto done; | |
4083 | ||
a60a2b73 CH |
4084 | if (pcie_has_flr(dev)) { |
4085 | if (!probe) | |
4086 | pcie_flr(dev); | |
4087 | rc = 0; | |
8c1c699f | 4088 | goto done; |
a60a2b73 | 4089 | } |
d91cdc74 | 4090 | |
8c1c699f | 4091 | rc = pci_af_flr(dev, probe); |
f85876ba YZ |
4092 | if (rc != -ENOTTY) |
4093 | goto done; | |
4094 | ||
4095 | rc = pci_pm_reset(dev, probe); | |
c12ff1df YZ |
4096 | if (rc != -ENOTTY) |
4097 | goto done; | |
4098 | ||
608c3881 AW |
4099 | rc = pci_dev_reset_slot_function(dev, probe); |
4100 | if (rc != -ENOTTY) | |
4101 | goto done; | |
4102 | ||
c12ff1df | 4103 | rc = pci_parent_bus_reset(dev, probe); |
8c1c699f | 4104 | done: |
977f857c KRW |
4105 | return rc; |
4106 | } | |
4107 | ||
77cb985a AW |
4108 | static void pci_dev_lock(struct pci_dev *dev) |
4109 | { | |
4110 | pci_cfg_access_lock(dev); | |
4111 | /* block PM suspend, driver probe, etc. */ | |
4112 | device_lock(&dev->dev); | |
4113 | } | |
4114 | ||
61cf16d8 AW |
4115 | /* Return 1 on successful lock, 0 on contention */ |
4116 | static int pci_dev_trylock(struct pci_dev *dev) | |
4117 | { | |
4118 | if (pci_cfg_access_trylock(dev)) { | |
4119 | if (device_trylock(&dev->dev)) | |
4120 | return 1; | |
4121 | pci_cfg_access_unlock(dev); | |
4122 | } | |
4123 | ||
4124 | return 0; | |
4125 | } | |
4126 | ||
77cb985a AW |
4127 | static void pci_dev_unlock(struct pci_dev *dev) |
4128 | { | |
4129 | device_unlock(&dev->dev); | |
4130 | pci_cfg_access_unlock(dev); | |
4131 | } | |
4132 | ||
3ebe7f9f KB |
4133 | /** |
4134 | * pci_reset_notify - notify device driver of reset | |
4135 | * @dev: device to be notified of reset | |
4136 | * @prepare: 'true' if device is about to be reset; 'false' if reset attempt | |
4137 | * completed | |
4138 | * | |
4139 | * Must be called prior to device access being disabled and after device | |
4140 | * access is restored. | |
4141 | */ | |
4142 | static void pci_reset_notify(struct pci_dev *dev, bool prepare) | |
4143 | { | |
4144 | const struct pci_error_handlers *err_handler = | |
4145 | dev->driver ? dev->driver->err_handler : NULL; | |
4146 | if (err_handler && err_handler->reset_notify) | |
4147 | err_handler->reset_notify(dev, prepare); | |
4148 | } | |
4149 | ||
77cb985a AW |
4150 | static void pci_dev_save_and_disable(struct pci_dev *dev) |
4151 | { | |
3ebe7f9f KB |
4152 | pci_reset_notify(dev, true); |
4153 | ||
a6cbaade AW |
4154 | /* |
4155 | * Wake-up device prior to save. PM registers default to D0 after | |
4156 | * reset and a simple register restore doesn't reliably return | |
4157 | * to a non-D0 state anyway. | |
4158 | */ | |
4159 | pci_set_power_state(dev, PCI_D0); | |
4160 | ||
77cb985a AW |
4161 | pci_save_state(dev); |
4162 | /* | |
4163 | * Disable the device by clearing the Command register, except for | |
4164 | * INTx-disable which is set. This not only disables MMIO and I/O port | |
4165 | * BARs, but also prevents the device from being Bus Master, preventing | |
4166 | * DMA from the device including MSI/MSI-X interrupts. For PCI 2.3 | |
4167 | * compliant devices, INTx-disable prevents legacy interrupts. | |
4168 | */ | |
4169 | pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE); | |
4170 | } | |
4171 | ||
4172 | static void pci_dev_restore(struct pci_dev *dev) | |
4173 | { | |
4174 | pci_restore_state(dev); | |
3ebe7f9f | 4175 | pci_reset_notify(dev, false); |
77cb985a AW |
4176 | } |
4177 | ||
977f857c KRW |
4178 | static int pci_dev_reset(struct pci_dev *dev, int probe) |
4179 | { | |
4180 | int rc; | |
4181 | ||
77cb985a AW |
4182 | if (!probe) |
4183 | pci_dev_lock(dev); | |
977f857c KRW |
4184 | |
4185 | rc = __pci_dev_reset(dev, probe); | |
4186 | ||
77cb985a AW |
4187 | if (!probe) |
4188 | pci_dev_unlock(dev); | |
4189 | ||
8c1c699f | 4190 | return rc; |
d91cdc74 | 4191 | } |
3ebe7f9f | 4192 | |
d91cdc74 | 4193 | /** |
8c1c699f YZ |
4194 | * __pci_reset_function - reset a PCI device function |
4195 | * @dev: PCI device to reset | |
d91cdc74 SY |
4196 | * |
4197 | * Some devices allow an individual function to be reset without affecting | |
4198 | * other functions in the same device. The PCI device must be responsive | |
4199 | * to PCI config space in order to use this function. | |
4200 | * | |
4201 | * The device function is presumed to be unused when this function is called. | |
4202 | * Resetting the device will make the contents of PCI configuration space | |
4203 | * random, so any caller of this must be prepared to reinitialise the | |
4204 | * device including MSI, bus mastering, BARs, decoding IO and memory spaces, | |
4205 | * etc. | |
4206 | * | |
8c1c699f | 4207 | * Returns 0 if the device function was successfully reset or negative if the |
d91cdc74 SY |
4208 | * device doesn't support resetting a single function. |
4209 | */ | |
8c1c699f | 4210 | int __pci_reset_function(struct pci_dev *dev) |
d91cdc74 | 4211 | { |
8c1c699f | 4212 | return pci_dev_reset(dev, 0); |
d91cdc74 | 4213 | } |
8c1c699f | 4214 | EXPORT_SYMBOL_GPL(__pci_reset_function); |
8dd7f803 | 4215 | |
6fbf9e7a KRW |
4216 | /** |
4217 | * __pci_reset_function_locked - reset a PCI device function while holding | |
4218 | * the @dev mutex lock. | |
4219 | * @dev: PCI device to reset | |
4220 | * | |
4221 | * Some devices allow an individual function to be reset without affecting | |
4222 | * other functions in the same device. The PCI device must be responsive | |
4223 | * to PCI config space in order to use this function. | |
4224 | * | |
4225 | * The device function is presumed to be unused and the caller is holding | |
4226 | * the device mutex lock when this function is called. | |
4227 | * Resetting the device will make the contents of PCI configuration space | |
4228 | * random, so any caller of this must be prepared to reinitialise the | |
4229 | * device including MSI, bus mastering, BARs, decoding IO and memory spaces, | |
4230 | * etc. | |
4231 | * | |
4232 | * Returns 0 if the device function was successfully reset or negative if the | |
4233 | * device doesn't support resetting a single function. | |
4234 | */ | |
4235 | int __pci_reset_function_locked(struct pci_dev *dev) | |
4236 | { | |
977f857c | 4237 | return __pci_dev_reset(dev, 0); |
6fbf9e7a KRW |
4238 | } |
4239 | EXPORT_SYMBOL_GPL(__pci_reset_function_locked); | |
4240 | ||
711d5779 MT |
4241 | /** |
4242 | * pci_probe_reset_function - check whether the device can be safely reset | |
4243 | * @dev: PCI device to reset | |
4244 | * | |
4245 | * Some devices allow an individual function to be reset without affecting | |
4246 | * other functions in the same device. The PCI device must be responsive | |
4247 | * to PCI config space in order to use this function. | |
4248 | * | |
4249 | * Returns 0 if the device function can be reset or negative if the | |
4250 | * device doesn't support resetting a single function. | |
4251 | */ | |
4252 | int pci_probe_reset_function(struct pci_dev *dev) | |
4253 | { | |
4254 | return pci_dev_reset(dev, 1); | |
4255 | } | |
4256 | ||
8dd7f803 | 4257 | /** |
8c1c699f YZ |
4258 | * pci_reset_function - quiesce and reset a PCI device function |
4259 | * @dev: PCI device to reset | |
8dd7f803 SY |
4260 | * |
4261 | * Some devices allow an individual function to be reset without affecting | |
4262 | * other functions in the same device. The PCI device must be responsive | |
4263 | * to PCI config space in order to use this function. | |
4264 | * | |
4265 | * This function does not just reset the PCI portion of a device, but | |
4266 | * clears all the state associated with the device. This function differs | |
8c1c699f | 4267 | * from __pci_reset_function in that it saves and restores device state |
8dd7f803 SY |
4268 | * over the reset. |
4269 | * | |
8c1c699f | 4270 | * Returns 0 if the device function was successfully reset or negative if the |
8dd7f803 SY |
4271 | * device doesn't support resetting a single function. |
4272 | */ | |
4273 | int pci_reset_function(struct pci_dev *dev) | |
4274 | { | |
8c1c699f | 4275 | int rc; |
8dd7f803 | 4276 | |
8c1c699f YZ |
4277 | rc = pci_dev_reset(dev, 1); |
4278 | if (rc) | |
4279 | return rc; | |
8dd7f803 | 4280 | |
77cb985a | 4281 | pci_dev_save_and_disable(dev); |
8dd7f803 | 4282 | |
8c1c699f | 4283 | rc = pci_dev_reset(dev, 0); |
8dd7f803 | 4284 | |
77cb985a | 4285 | pci_dev_restore(dev); |
8dd7f803 | 4286 | |
8c1c699f | 4287 | return rc; |
8dd7f803 SY |
4288 | } |
4289 | EXPORT_SYMBOL_GPL(pci_reset_function); | |
4290 | ||
61cf16d8 AW |
4291 | /** |
4292 | * pci_try_reset_function - quiesce and reset a PCI device function | |
4293 | * @dev: PCI device to reset | |
4294 | * | |
4295 | * Same as above, except return -EAGAIN if unable to lock device. | |
4296 | */ | |
4297 | int pci_try_reset_function(struct pci_dev *dev) | |
4298 | { | |
4299 | int rc; | |
4300 | ||
4301 | rc = pci_dev_reset(dev, 1); | |
4302 | if (rc) | |
4303 | return rc; | |
4304 | ||
4305 | pci_dev_save_and_disable(dev); | |
4306 | ||
4307 | if (pci_dev_trylock(dev)) { | |
4308 | rc = __pci_dev_reset(dev, 0); | |
4309 | pci_dev_unlock(dev); | |
4310 | } else | |
4311 | rc = -EAGAIN; | |
4312 | ||
4313 | pci_dev_restore(dev); | |
4314 | ||
4315 | return rc; | |
4316 | } | |
4317 | EXPORT_SYMBOL_GPL(pci_try_reset_function); | |
4318 | ||
f331a859 AW |
4319 | /* Do any devices on or below this bus prevent a bus reset? */ |
4320 | static bool pci_bus_resetable(struct pci_bus *bus) | |
4321 | { | |
4322 | struct pci_dev *dev; | |
4323 | ||
4324 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
4325 | if (dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET || | |
4326 | (dev->subordinate && !pci_bus_resetable(dev->subordinate))) | |
4327 | return false; | |
4328 | } | |
4329 | ||
4330 | return true; | |
4331 | } | |
4332 | ||
090a3c53 AW |
4333 | /* Lock devices from the top of the tree down */ |
4334 | static void pci_bus_lock(struct pci_bus *bus) | |
4335 | { | |
4336 | struct pci_dev *dev; | |
4337 | ||
4338 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
4339 | pci_dev_lock(dev); | |
4340 | if (dev->subordinate) | |
4341 | pci_bus_lock(dev->subordinate); | |
4342 | } | |
4343 | } | |
4344 | ||
4345 | /* Unlock devices from the bottom of the tree up */ | |
4346 | static void pci_bus_unlock(struct pci_bus *bus) | |
4347 | { | |
4348 | struct pci_dev *dev; | |
4349 | ||
4350 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
4351 | if (dev->subordinate) | |
4352 | pci_bus_unlock(dev->subordinate); | |
4353 | pci_dev_unlock(dev); | |
4354 | } | |
4355 | } | |
4356 | ||
61cf16d8 AW |
4357 | /* Return 1 on successful lock, 0 on contention */ |
4358 | static int pci_bus_trylock(struct pci_bus *bus) | |
4359 | { | |
4360 | struct pci_dev *dev; | |
4361 | ||
4362 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
4363 | if (!pci_dev_trylock(dev)) | |
4364 | goto unlock; | |
4365 | if (dev->subordinate) { | |
4366 | if (!pci_bus_trylock(dev->subordinate)) { | |
4367 | pci_dev_unlock(dev); | |
4368 | goto unlock; | |
4369 | } | |
4370 | } | |
4371 | } | |
4372 | return 1; | |
4373 | ||
4374 | unlock: | |
4375 | list_for_each_entry_continue_reverse(dev, &bus->devices, bus_list) { | |
4376 | if (dev->subordinate) | |
4377 | pci_bus_unlock(dev->subordinate); | |
4378 | pci_dev_unlock(dev); | |
4379 | } | |
4380 | return 0; | |
4381 | } | |
4382 | ||
f331a859 AW |
4383 | /* Do any devices on or below this slot prevent a bus reset? */ |
4384 | static bool pci_slot_resetable(struct pci_slot *slot) | |
4385 | { | |
4386 | struct pci_dev *dev; | |
4387 | ||
4388 | list_for_each_entry(dev, &slot->bus->devices, bus_list) { | |
4389 | if (!dev->slot || dev->slot != slot) | |
4390 | continue; | |
4391 | if (dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET || | |
4392 | (dev->subordinate && !pci_bus_resetable(dev->subordinate))) | |
4393 | return false; | |
4394 | } | |
4395 | ||
4396 | return true; | |
4397 | } | |
4398 | ||
090a3c53 AW |
4399 | /* Lock devices from the top of the tree down */ |
4400 | static void pci_slot_lock(struct pci_slot *slot) | |
4401 | { | |
4402 | struct pci_dev *dev; | |
4403 | ||
4404 | list_for_each_entry(dev, &slot->bus->devices, bus_list) { | |
4405 | if (!dev->slot || dev->slot != slot) | |
4406 | continue; | |
4407 | pci_dev_lock(dev); | |
4408 | if (dev->subordinate) | |
4409 | pci_bus_lock(dev->subordinate); | |
4410 | } | |
4411 | } | |
4412 | ||
4413 | /* Unlock devices from the bottom of the tree up */ | |
4414 | static void pci_slot_unlock(struct pci_slot *slot) | |
4415 | { | |
4416 | struct pci_dev *dev; | |
4417 | ||
4418 | list_for_each_entry(dev, &slot->bus->devices, bus_list) { | |
4419 | if (!dev->slot || dev->slot != slot) | |
4420 | continue; | |
4421 | if (dev->subordinate) | |
4422 | pci_bus_unlock(dev->subordinate); | |
4423 | pci_dev_unlock(dev); | |
4424 | } | |
4425 | } | |
4426 | ||
61cf16d8 AW |
4427 | /* Return 1 on successful lock, 0 on contention */ |
4428 | static int pci_slot_trylock(struct pci_slot *slot) | |
4429 | { | |
4430 | struct pci_dev *dev; | |
4431 | ||
4432 | list_for_each_entry(dev, &slot->bus->devices, bus_list) { | |
4433 | if (!dev->slot || dev->slot != slot) | |
4434 | continue; | |
4435 | if (!pci_dev_trylock(dev)) | |
4436 | goto unlock; | |
4437 | if (dev->subordinate) { | |
4438 | if (!pci_bus_trylock(dev->subordinate)) { | |
4439 | pci_dev_unlock(dev); | |
4440 | goto unlock; | |
4441 | } | |
4442 | } | |
4443 | } | |
4444 | return 1; | |
4445 | ||
4446 | unlock: | |
4447 | list_for_each_entry_continue_reverse(dev, | |
4448 | &slot->bus->devices, bus_list) { | |
4449 | if (!dev->slot || dev->slot != slot) | |
4450 | continue; | |
4451 | if (dev->subordinate) | |
4452 | pci_bus_unlock(dev->subordinate); | |
4453 | pci_dev_unlock(dev); | |
4454 | } | |
4455 | return 0; | |
4456 | } | |
4457 | ||
090a3c53 AW |
4458 | /* Save and disable devices from the top of the tree down */ |
4459 | static void pci_bus_save_and_disable(struct pci_bus *bus) | |
4460 | { | |
4461 | struct pci_dev *dev; | |
4462 | ||
4463 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
4464 | pci_dev_save_and_disable(dev); | |
4465 | if (dev->subordinate) | |
4466 | pci_bus_save_and_disable(dev->subordinate); | |
4467 | } | |
4468 | } | |
4469 | ||
4470 | /* | |
4471 | * Restore devices from top of the tree down - parent bridges need to be | |
4472 | * restored before we can get to subordinate devices. | |
4473 | */ | |
4474 | static void pci_bus_restore(struct pci_bus *bus) | |
4475 | { | |
4476 | struct pci_dev *dev; | |
4477 | ||
4478 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
4479 | pci_dev_restore(dev); | |
4480 | if (dev->subordinate) | |
4481 | pci_bus_restore(dev->subordinate); | |
4482 | } | |
4483 | } | |
4484 | ||
4485 | /* Save and disable devices from the top of the tree down */ | |
4486 | static void pci_slot_save_and_disable(struct pci_slot *slot) | |
4487 | { | |
4488 | struct pci_dev *dev; | |
4489 | ||
4490 | list_for_each_entry(dev, &slot->bus->devices, bus_list) { | |
4491 | if (!dev->slot || dev->slot != slot) | |
4492 | continue; | |
4493 | pci_dev_save_and_disable(dev); | |
4494 | if (dev->subordinate) | |
4495 | pci_bus_save_and_disable(dev->subordinate); | |
4496 | } | |
4497 | } | |
4498 | ||
4499 | /* | |
4500 | * Restore devices from top of the tree down - parent bridges need to be | |
4501 | * restored before we can get to subordinate devices. | |
4502 | */ | |
4503 | static void pci_slot_restore(struct pci_slot *slot) | |
4504 | { | |
4505 | struct pci_dev *dev; | |
4506 | ||
4507 | list_for_each_entry(dev, &slot->bus->devices, bus_list) { | |
4508 | if (!dev->slot || dev->slot != slot) | |
4509 | continue; | |
4510 | pci_dev_restore(dev); | |
4511 | if (dev->subordinate) | |
4512 | pci_bus_restore(dev->subordinate); | |
4513 | } | |
4514 | } | |
4515 | ||
4516 | static int pci_slot_reset(struct pci_slot *slot, int probe) | |
4517 | { | |
4518 | int rc; | |
4519 | ||
f331a859 | 4520 | if (!slot || !pci_slot_resetable(slot)) |
090a3c53 AW |
4521 | return -ENOTTY; |
4522 | ||
4523 | if (!probe) | |
4524 | pci_slot_lock(slot); | |
4525 | ||
4526 | might_sleep(); | |
4527 | ||
4528 | rc = pci_reset_hotplug_slot(slot->hotplug, probe); | |
4529 | ||
4530 | if (!probe) | |
4531 | pci_slot_unlock(slot); | |
4532 | ||
4533 | return rc; | |
4534 | } | |
4535 | ||
9a3d2b9b AW |
4536 | /** |
4537 | * pci_probe_reset_slot - probe whether a PCI slot can be reset | |
4538 | * @slot: PCI slot to probe | |
4539 | * | |
4540 | * Return 0 if slot can be reset, negative if a slot reset is not supported. | |
4541 | */ | |
4542 | int pci_probe_reset_slot(struct pci_slot *slot) | |
4543 | { | |
4544 | return pci_slot_reset(slot, 1); | |
4545 | } | |
4546 | EXPORT_SYMBOL_GPL(pci_probe_reset_slot); | |
4547 | ||
090a3c53 AW |
4548 | /** |
4549 | * pci_reset_slot - reset a PCI slot | |
4550 | * @slot: PCI slot to reset | |
4551 | * | |
4552 | * A PCI bus may host multiple slots, each slot may support a reset mechanism | |
4553 | * independent of other slots. For instance, some slots may support slot power | |
4554 | * control. In the case of a 1:1 bus to slot architecture, this function may | |
4555 | * wrap the bus reset to avoid spurious slot related events such as hotplug. | |
4556 | * Generally a slot reset should be attempted before a bus reset. All of the | |
4557 | * function of the slot and any subordinate buses behind the slot are reset | |
4558 | * through this function. PCI config space of all devices in the slot and | |
4559 | * behind the slot is saved before and restored after reset. | |
4560 | * | |
4561 | * Return 0 on success, non-zero on error. | |
4562 | */ | |
4563 | int pci_reset_slot(struct pci_slot *slot) | |
4564 | { | |
4565 | int rc; | |
4566 | ||
4567 | rc = pci_slot_reset(slot, 1); | |
4568 | if (rc) | |
4569 | return rc; | |
4570 | ||
4571 | pci_slot_save_and_disable(slot); | |
4572 | ||
4573 | rc = pci_slot_reset(slot, 0); | |
4574 | ||
4575 | pci_slot_restore(slot); | |
4576 | ||
4577 | return rc; | |
4578 | } | |
4579 | EXPORT_SYMBOL_GPL(pci_reset_slot); | |
4580 | ||
61cf16d8 AW |
4581 | /** |
4582 | * pci_try_reset_slot - Try to reset a PCI slot | |
4583 | * @slot: PCI slot to reset | |
4584 | * | |
4585 | * Same as above except return -EAGAIN if the slot cannot be locked | |
4586 | */ | |
4587 | int pci_try_reset_slot(struct pci_slot *slot) | |
4588 | { | |
4589 | int rc; | |
4590 | ||
4591 | rc = pci_slot_reset(slot, 1); | |
4592 | if (rc) | |
4593 | return rc; | |
4594 | ||
4595 | pci_slot_save_and_disable(slot); | |
4596 | ||
4597 | if (pci_slot_trylock(slot)) { | |
4598 | might_sleep(); | |
4599 | rc = pci_reset_hotplug_slot(slot->hotplug, 0); | |
4600 | pci_slot_unlock(slot); | |
4601 | } else | |
4602 | rc = -EAGAIN; | |
4603 | ||
4604 | pci_slot_restore(slot); | |
4605 | ||
4606 | return rc; | |
4607 | } | |
4608 | EXPORT_SYMBOL_GPL(pci_try_reset_slot); | |
4609 | ||
090a3c53 AW |
4610 | static int pci_bus_reset(struct pci_bus *bus, int probe) |
4611 | { | |
f331a859 | 4612 | if (!bus->self || !pci_bus_resetable(bus)) |
090a3c53 AW |
4613 | return -ENOTTY; |
4614 | ||
4615 | if (probe) | |
4616 | return 0; | |
4617 | ||
4618 | pci_bus_lock(bus); | |
4619 | ||
4620 | might_sleep(); | |
4621 | ||
4622 | pci_reset_bridge_secondary_bus(bus->self); | |
4623 | ||
4624 | pci_bus_unlock(bus); | |
4625 | ||
4626 | return 0; | |
4627 | } | |
4628 | ||
9a3d2b9b AW |
4629 | /** |
4630 | * pci_probe_reset_bus - probe whether a PCI bus can be reset | |
4631 | * @bus: PCI bus to probe | |
4632 | * | |
4633 | * Return 0 if bus can be reset, negative if a bus reset is not supported. | |
4634 | */ | |
4635 | int pci_probe_reset_bus(struct pci_bus *bus) | |
4636 | { | |
4637 | return pci_bus_reset(bus, 1); | |
4638 | } | |
4639 | EXPORT_SYMBOL_GPL(pci_probe_reset_bus); | |
4640 | ||
090a3c53 AW |
4641 | /** |
4642 | * pci_reset_bus - reset a PCI bus | |
4643 | * @bus: top level PCI bus to reset | |
4644 | * | |
4645 | * Do a bus reset on the given bus and any subordinate buses, saving | |
4646 | * and restoring state of all devices. | |
4647 | * | |
4648 | * Return 0 on success, non-zero on error. | |
4649 | */ | |
4650 | int pci_reset_bus(struct pci_bus *bus) | |
4651 | { | |
4652 | int rc; | |
4653 | ||
4654 | rc = pci_bus_reset(bus, 1); | |
4655 | if (rc) | |
4656 | return rc; | |
4657 | ||
4658 | pci_bus_save_and_disable(bus); | |
4659 | ||
4660 | rc = pci_bus_reset(bus, 0); | |
4661 | ||
4662 | pci_bus_restore(bus); | |
4663 | ||
4664 | return rc; | |
4665 | } | |
4666 | EXPORT_SYMBOL_GPL(pci_reset_bus); | |
4667 | ||
61cf16d8 AW |
4668 | /** |
4669 | * pci_try_reset_bus - Try to reset a PCI bus | |
4670 | * @bus: top level PCI bus to reset | |
4671 | * | |
4672 | * Same as above except return -EAGAIN if the bus cannot be locked | |
4673 | */ | |
4674 | int pci_try_reset_bus(struct pci_bus *bus) | |
4675 | { | |
4676 | int rc; | |
4677 | ||
4678 | rc = pci_bus_reset(bus, 1); | |
4679 | if (rc) | |
4680 | return rc; | |
4681 | ||
4682 | pci_bus_save_and_disable(bus); | |
4683 | ||
4684 | if (pci_bus_trylock(bus)) { | |
4685 | might_sleep(); | |
4686 | pci_reset_bridge_secondary_bus(bus->self); | |
4687 | pci_bus_unlock(bus); | |
4688 | } else | |
4689 | rc = -EAGAIN; | |
4690 | ||
4691 | pci_bus_restore(bus); | |
4692 | ||
4693 | return rc; | |
4694 | } | |
4695 | EXPORT_SYMBOL_GPL(pci_try_reset_bus); | |
4696 | ||
d556ad4b PO |
4697 | /** |
4698 | * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count | |
4699 | * @dev: PCI device to query | |
4700 | * | |
4701 | * Returns mmrbc: maximum designed memory read count in bytes | |
4702 | * or appropriate error value. | |
4703 | */ | |
4704 | int pcix_get_max_mmrbc(struct pci_dev *dev) | |
4705 | { | |
7c9e2b1c | 4706 | int cap; |
d556ad4b PO |
4707 | u32 stat; |
4708 | ||
4709 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
4710 | if (!cap) | |
4711 | return -EINVAL; | |
4712 | ||
7c9e2b1c | 4713 | if (pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat)) |
d556ad4b PO |
4714 | return -EINVAL; |
4715 | ||
25daeb55 | 4716 | return 512 << ((stat & PCI_X_STATUS_MAX_READ) >> 21); |
d556ad4b PO |
4717 | } |
4718 | EXPORT_SYMBOL(pcix_get_max_mmrbc); | |
4719 | ||
4720 | /** | |
4721 | * pcix_get_mmrbc - get PCI-X maximum memory read byte count | |
4722 | * @dev: PCI device to query | |
4723 | * | |
4724 | * Returns mmrbc: maximum memory read count in bytes | |
4725 | * or appropriate error value. | |
4726 | */ | |
4727 | int pcix_get_mmrbc(struct pci_dev *dev) | |
4728 | { | |
7c9e2b1c | 4729 | int cap; |
bdc2bda7 | 4730 | u16 cmd; |
d556ad4b PO |
4731 | |
4732 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
4733 | if (!cap) | |
4734 | return -EINVAL; | |
4735 | ||
7c9e2b1c DN |
4736 | if (pci_read_config_word(dev, cap + PCI_X_CMD, &cmd)) |
4737 | return -EINVAL; | |
d556ad4b | 4738 | |
7c9e2b1c | 4739 | return 512 << ((cmd & PCI_X_CMD_MAX_READ) >> 2); |
d556ad4b PO |
4740 | } |
4741 | EXPORT_SYMBOL(pcix_get_mmrbc); | |
4742 | ||
4743 | /** | |
4744 | * pcix_set_mmrbc - set PCI-X maximum memory read byte count | |
4745 | * @dev: PCI device to query | |
4746 | * @mmrbc: maximum memory read count in bytes | |
4747 | * valid values are 512, 1024, 2048, 4096 | |
4748 | * | |
4749 | * If possible sets maximum memory read byte count, some bridges have erratas | |
4750 | * that prevent this. | |
4751 | */ | |
4752 | int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc) | |
4753 | { | |
7c9e2b1c | 4754 | int cap; |
bdc2bda7 DN |
4755 | u32 stat, v, o; |
4756 | u16 cmd; | |
d556ad4b | 4757 | |
229f5afd | 4758 | if (mmrbc < 512 || mmrbc > 4096 || !is_power_of_2(mmrbc)) |
7c9e2b1c | 4759 | return -EINVAL; |
d556ad4b PO |
4760 | |
4761 | v = ffs(mmrbc) - 10; | |
4762 | ||
4763 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
4764 | if (!cap) | |
7c9e2b1c | 4765 | return -EINVAL; |
d556ad4b | 4766 | |
7c9e2b1c DN |
4767 | if (pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat)) |
4768 | return -EINVAL; | |
d556ad4b PO |
4769 | |
4770 | if (v > (stat & PCI_X_STATUS_MAX_READ) >> 21) | |
4771 | return -E2BIG; | |
4772 | ||
7c9e2b1c DN |
4773 | if (pci_read_config_word(dev, cap + PCI_X_CMD, &cmd)) |
4774 | return -EINVAL; | |
d556ad4b PO |
4775 | |
4776 | o = (cmd & PCI_X_CMD_MAX_READ) >> 2; | |
4777 | if (o != v) { | |
809a3bf9 | 4778 | if (v > o && (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MMRBC)) |
d556ad4b PO |
4779 | return -EIO; |
4780 | ||
4781 | cmd &= ~PCI_X_CMD_MAX_READ; | |
4782 | cmd |= v << 2; | |
7c9e2b1c DN |
4783 | if (pci_write_config_word(dev, cap + PCI_X_CMD, cmd)) |
4784 | return -EIO; | |
d556ad4b | 4785 | } |
7c9e2b1c | 4786 | return 0; |
d556ad4b PO |
4787 | } |
4788 | EXPORT_SYMBOL(pcix_set_mmrbc); | |
4789 | ||
4790 | /** | |
4791 | * pcie_get_readrq - get PCI Express read request size | |
4792 | * @dev: PCI device to query | |
4793 | * | |
4794 | * Returns maximum memory read request in bytes | |
4795 | * or appropriate error value. | |
4796 | */ | |
4797 | int pcie_get_readrq(struct pci_dev *dev) | |
4798 | { | |
d556ad4b PO |
4799 | u16 ctl; |
4800 | ||
59875ae4 | 4801 | pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &ctl); |
d556ad4b | 4802 | |
59875ae4 | 4803 | return 128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12); |
d556ad4b PO |
4804 | } |
4805 | EXPORT_SYMBOL(pcie_get_readrq); | |
4806 | ||
4807 | /** | |
4808 | * pcie_set_readrq - set PCI Express maximum memory read request | |
4809 | * @dev: PCI device to query | |
42e61f4a | 4810 | * @rq: maximum memory read count in bytes |
d556ad4b PO |
4811 | * valid values are 128, 256, 512, 1024, 2048, 4096 |
4812 | * | |
c9b378c7 | 4813 | * If possible sets maximum memory read request in bytes |
d556ad4b PO |
4814 | */ |
4815 | int pcie_set_readrq(struct pci_dev *dev, int rq) | |
4816 | { | |
59875ae4 | 4817 | u16 v; |
d556ad4b | 4818 | |
229f5afd | 4819 | if (rq < 128 || rq > 4096 || !is_power_of_2(rq)) |
59875ae4 | 4820 | return -EINVAL; |
d556ad4b | 4821 | |
a1c473aa BH |
4822 | /* |
4823 | * If using the "performance" PCIe config, we clamp the | |
4824 | * read rq size to the max packet size to prevent the | |
4825 | * host bridge generating requests larger than we can | |
4826 | * cope with | |
4827 | */ | |
4828 | if (pcie_bus_config == PCIE_BUS_PERFORMANCE) { | |
4829 | int mps = pcie_get_mps(dev); | |
4830 | ||
a1c473aa BH |
4831 | if (mps < rq) |
4832 | rq = mps; | |
4833 | } | |
4834 | ||
4835 | v = (ffs(rq) - 8) << 12; | |
d556ad4b | 4836 | |
59875ae4 JL |
4837 | return pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL, |
4838 | PCI_EXP_DEVCTL_READRQ, v); | |
d556ad4b PO |
4839 | } |
4840 | EXPORT_SYMBOL(pcie_set_readrq); | |
4841 | ||
b03e7495 JM |
4842 | /** |
4843 | * pcie_get_mps - get PCI Express maximum payload size | |
4844 | * @dev: PCI device to query | |
4845 | * | |
4846 | * Returns maximum payload size in bytes | |
b03e7495 JM |
4847 | */ |
4848 | int pcie_get_mps(struct pci_dev *dev) | |
4849 | { | |
b03e7495 JM |
4850 | u16 ctl; |
4851 | ||
59875ae4 | 4852 | pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &ctl); |
b03e7495 | 4853 | |
59875ae4 | 4854 | return 128 << ((ctl & PCI_EXP_DEVCTL_PAYLOAD) >> 5); |
b03e7495 | 4855 | } |
f1c66c46 | 4856 | EXPORT_SYMBOL(pcie_get_mps); |
b03e7495 JM |
4857 | |
4858 | /** | |
4859 | * pcie_set_mps - set PCI Express maximum payload size | |
4860 | * @dev: PCI device to query | |
47c08f31 | 4861 | * @mps: maximum payload size in bytes |
b03e7495 JM |
4862 | * valid values are 128, 256, 512, 1024, 2048, 4096 |
4863 | * | |
4864 | * If possible sets maximum payload size | |
4865 | */ | |
4866 | int pcie_set_mps(struct pci_dev *dev, int mps) | |
4867 | { | |
59875ae4 | 4868 | u16 v; |
b03e7495 JM |
4869 | |
4870 | if (mps < 128 || mps > 4096 || !is_power_of_2(mps)) | |
59875ae4 | 4871 | return -EINVAL; |
b03e7495 JM |
4872 | |
4873 | v = ffs(mps) - 8; | |
f7625980 | 4874 | if (v > dev->pcie_mpss) |
59875ae4 | 4875 | return -EINVAL; |
b03e7495 JM |
4876 | v <<= 5; |
4877 | ||
59875ae4 JL |
4878 | return pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL, |
4879 | PCI_EXP_DEVCTL_PAYLOAD, v); | |
b03e7495 | 4880 | } |
f1c66c46 | 4881 | EXPORT_SYMBOL(pcie_set_mps); |
b03e7495 | 4882 | |
81377c8d JK |
4883 | /** |
4884 | * pcie_get_minimum_link - determine minimum link settings of a PCI device | |
4885 | * @dev: PCI device to query | |
4886 | * @speed: storage for minimum speed | |
4887 | * @width: storage for minimum width | |
4888 | * | |
4889 | * This function will walk up the PCI device chain and determine the minimum | |
4890 | * link width and speed of the device. | |
4891 | */ | |
4892 | int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed, | |
4893 | enum pcie_link_width *width) | |
4894 | { | |
4895 | int ret; | |
4896 | ||
4897 | *speed = PCI_SPEED_UNKNOWN; | |
4898 | *width = PCIE_LNK_WIDTH_UNKNOWN; | |
4899 | ||
4900 | while (dev) { | |
4901 | u16 lnksta; | |
4902 | enum pci_bus_speed next_speed; | |
4903 | enum pcie_link_width next_width; | |
4904 | ||
4905 | ret = pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &lnksta); | |
4906 | if (ret) | |
4907 | return ret; | |
4908 | ||
4909 | next_speed = pcie_link_speed[lnksta & PCI_EXP_LNKSTA_CLS]; | |
4910 | next_width = (lnksta & PCI_EXP_LNKSTA_NLW) >> | |
4911 | PCI_EXP_LNKSTA_NLW_SHIFT; | |
4912 | ||
4913 | if (next_speed < *speed) | |
4914 | *speed = next_speed; | |
4915 | ||
4916 | if (next_width < *width) | |
4917 | *width = next_width; | |
4918 | ||
4919 | dev = dev->bus->self; | |
4920 | } | |
4921 | ||
4922 | return 0; | |
4923 | } | |
4924 | EXPORT_SYMBOL(pcie_get_minimum_link); | |
4925 | ||
c87deff7 HS |
4926 | /** |
4927 | * pci_select_bars - Make BAR mask from the type of resource | |
f95d882d | 4928 | * @dev: the PCI device for which BAR mask is made |
c87deff7 HS |
4929 | * @flags: resource type mask to be selected |
4930 | * | |
4931 | * This helper routine makes bar mask from the type of resource. | |
4932 | */ | |
4933 | int pci_select_bars(struct pci_dev *dev, unsigned long flags) | |
4934 | { | |
4935 | int i, bars = 0; | |
4936 | for (i = 0; i < PCI_NUM_RESOURCES; i++) | |
4937 | if (pci_resource_flags(dev, i) & flags) | |
4938 | bars |= (1 << i); | |
4939 | return bars; | |
4940 | } | |
b7fe9434 | 4941 | EXPORT_SYMBOL(pci_select_bars); |
c87deff7 | 4942 | |
95a8b6ef MT |
4943 | /* Some architectures require additional programming to enable VGA */ |
4944 | static arch_set_vga_state_t arch_set_vga_state; | |
4945 | ||
4946 | void __init pci_register_set_vga_state(arch_set_vga_state_t func) | |
4947 | { | |
4948 | arch_set_vga_state = func; /* NULL disables */ | |
4949 | } | |
4950 | ||
4951 | static int pci_set_vga_state_arch(struct pci_dev *dev, bool decode, | |
3c78bc61 | 4952 | unsigned int command_bits, u32 flags) |
95a8b6ef MT |
4953 | { |
4954 | if (arch_set_vga_state) | |
4955 | return arch_set_vga_state(dev, decode, command_bits, | |
7ad35cf2 | 4956 | flags); |
95a8b6ef MT |
4957 | return 0; |
4958 | } | |
4959 | ||
deb2d2ec BH |
4960 | /** |
4961 | * pci_set_vga_state - set VGA decode state on device and parents if requested | |
19eea630 RD |
4962 | * @dev: the PCI device |
4963 | * @decode: true = enable decoding, false = disable decoding | |
4964 | * @command_bits: PCI_COMMAND_IO and/or PCI_COMMAND_MEMORY | |
3f37d622 | 4965 | * @flags: traverse ancestors and change bridges |
3448a19d | 4966 | * CHANGE_BRIDGE_ONLY / CHANGE_BRIDGE |
deb2d2ec BH |
4967 | */ |
4968 | int pci_set_vga_state(struct pci_dev *dev, bool decode, | |
3448a19d | 4969 | unsigned int command_bits, u32 flags) |
deb2d2ec BH |
4970 | { |
4971 | struct pci_bus *bus; | |
4972 | struct pci_dev *bridge; | |
4973 | u16 cmd; | |
95a8b6ef | 4974 | int rc; |
deb2d2ec | 4975 | |
67ebd814 | 4976 | WARN_ON((flags & PCI_VGA_STATE_CHANGE_DECODES) && (command_bits & ~(PCI_COMMAND_IO|PCI_COMMAND_MEMORY))); |
deb2d2ec | 4977 | |
95a8b6ef | 4978 | /* ARCH specific VGA enables */ |
3448a19d | 4979 | rc = pci_set_vga_state_arch(dev, decode, command_bits, flags); |
95a8b6ef MT |
4980 | if (rc) |
4981 | return rc; | |
4982 | ||
3448a19d DA |
4983 | if (flags & PCI_VGA_STATE_CHANGE_DECODES) { |
4984 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
4985 | if (decode == true) | |
4986 | cmd |= command_bits; | |
4987 | else | |
4988 | cmd &= ~command_bits; | |
4989 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
4990 | } | |
deb2d2ec | 4991 | |
3448a19d | 4992 | if (!(flags & PCI_VGA_STATE_CHANGE_BRIDGE)) |
deb2d2ec BH |
4993 | return 0; |
4994 | ||
4995 | bus = dev->bus; | |
4996 | while (bus) { | |
4997 | bridge = bus->self; | |
4998 | if (bridge) { | |
4999 | pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, | |
5000 | &cmd); | |
5001 | if (decode == true) | |
5002 | cmd |= PCI_BRIDGE_CTL_VGA; | |
5003 | else | |
5004 | cmd &= ~PCI_BRIDGE_CTL_VGA; | |
5005 | pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, | |
5006 | cmd); | |
5007 | } | |
5008 | bus = bus->parent; | |
5009 | } | |
5010 | return 0; | |
5011 | } | |
5012 | ||
f0af9593 BH |
5013 | /** |
5014 | * pci_add_dma_alias - Add a DMA devfn alias for a device | |
5015 | * @dev: the PCI device for which alias is added | |
5016 | * @devfn: alias slot and function | |
5017 | * | |
5018 | * This helper encodes 8-bit devfn as bit number in dma_alias_mask. | |
5019 | * It should be called early, preferably as PCI fixup header quirk. | |
5020 | */ | |
5021 | void pci_add_dma_alias(struct pci_dev *dev, u8 devfn) | |
5022 | { | |
338c3149 JL |
5023 | if (!dev->dma_alias_mask) |
5024 | dev->dma_alias_mask = kcalloc(BITS_TO_LONGS(U8_MAX), | |
5025 | sizeof(long), GFP_KERNEL); | |
5026 | if (!dev->dma_alias_mask) { | |
5027 | dev_warn(&dev->dev, "Unable to allocate DMA alias mask\n"); | |
5028 | return; | |
5029 | } | |
5030 | ||
5031 | set_bit(devfn, dev->dma_alias_mask); | |
48c83080 BH |
5032 | dev_info(&dev->dev, "Enabling fixed DMA alias to %02x.%d\n", |
5033 | PCI_SLOT(devfn), PCI_FUNC(devfn)); | |
f0af9593 BH |
5034 | } |
5035 | ||
338c3149 JL |
5036 | bool pci_devs_are_dma_aliases(struct pci_dev *dev1, struct pci_dev *dev2) |
5037 | { | |
5038 | return (dev1->dma_alias_mask && | |
5039 | test_bit(dev2->devfn, dev1->dma_alias_mask)) || | |
5040 | (dev2->dma_alias_mask && | |
5041 | test_bit(dev1->devfn, dev2->dma_alias_mask)); | |
5042 | } | |
5043 | ||
8496e85c RW |
5044 | bool pci_device_is_present(struct pci_dev *pdev) |
5045 | { | |
5046 | u32 v; | |
5047 | ||
fe2bd75b KB |
5048 | if (pci_dev_is_disconnected(pdev)) |
5049 | return false; | |
8496e85c RW |
5050 | return pci_bus_read_dev_vendor_id(pdev->bus, pdev->devfn, &v, 0); |
5051 | } | |
5052 | EXPORT_SYMBOL_GPL(pci_device_is_present); | |
5053 | ||
08249651 RW |
5054 | void pci_ignore_hotplug(struct pci_dev *dev) |
5055 | { | |
5056 | struct pci_dev *bridge = dev->bus->self; | |
5057 | ||
5058 | dev->ignore_hotplug = 1; | |
5059 | /* Propagate the "ignore hotplug" setting to the parent bridge. */ | |
5060 | if (bridge) | |
5061 | bridge->ignore_hotplug = 1; | |
5062 | } | |
5063 | EXPORT_SYMBOL_GPL(pci_ignore_hotplug); | |
5064 | ||
0a701aa6 YX |
5065 | resource_size_t __weak pcibios_default_alignment(void) |
5066 | { | |
5067 | return 0; | |
5068 | } | |
5069 | ||
32a9a682 YS |
5070 | #define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE |
5071 | static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0}; | |
e9d1e492 | 5072 | static DEFINE_SPINLOCK(resource_alignment_lock); |
32a9a682 YS |
5073 | |
5074 | /** | |
5075 | * pci_specified_resource_alignment - get resource alignment specified by user. | |
5076 | * @dev: the PCI device to get | |
e3adec72 | 5077 | * @resize: whether or not to change resources' size when reassigning alignment |
32a9a682 YS |
5078 | * |
5079 | * RETURNS: Resource alignment if it is specified. | |
5080 | * Zero if it is not specified. | |
5081 | */ | |
e3adec72 YX |
5082 | static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev, |
5083 | bool *resize) | |
32a9a682 YS |
5084 | { |
5085 | int seg, bus, slot, func, align_order, count; | |
644a544f | 5086 | unsigned short vendor, device, subsystem_vendor, subsystem_device; |
0a701aa6 | 5087 | resource_size_t align = pcibios_default_alignment(); |
32a9a682 YS |
5088 | char *p; |
5089 | ||
5090 | spin_lock(&resource_alignment_lock); | |
5091 | p = resource_alignment_param; | |
0a701aa6 | 5092 | if (!*p && !align) |
f0b99f70 YX |
5093 | goto out; |
5094 | if (pci_has_flag(PCI_PROBE_ONLY)) { | |
0a701aa6 | 5095 | align = 0; |
f0b99f70 YX |
5096 | pr_info_once("PCI: Ignoring requested alignments (PCI_PROBE_ONLY)\n"); |
5097 | goto out; | |
5098 | } | |
5099 | ||
32a9a682 YS |
5100 | while (*p) { |
5101 | count = 0; | |
5102 | if (sscanf(p, "%d%n", &align_order, &count) == 1 && | |
5103 | p[count] == '@') { | |
5104 | p += count + 1; | |
5105 | } else { | |
5106 | align_order = -1; | |
5107 | } | |
644a544f KMEE |
5108 | if (strncmp(p, "pci:", 4) == 0) { |
5109 | /* PCI vendor/device (subvendor/subdevice) ids are specified */ | |
5110 | p += 4; | |
5111 | if (sscanf(p, "%hx:%hx:%hx:%hx%n", | |
5112 | &vendor, &device, &subsystem_vendor, &subsystem_device, &count) != 4) { | |
5113 | if (sscanf(p, "%hx:%hx%n", &vendor, &device, &count) != 2) { | |
5114 | printk(KERN_ERR "PCI: Can't parse resource_alignment parameter: pci:%s\n", | |
5115 | p); | |
5116 | break; | |
5117 | } | |
5118 | subsystem_vendor = subsystem_device = 0; | |
5119 | } | |
5120 | p += count; | |
5121 | if ((!vendor || (vendor == dev->vendor)) && | |
5122 | (!device || (device == dev->device)) && | |
5123 | (!subsystem_vendor || (subsystem_vendor == dev->subsystem_vendor)) && | |
5124 | (!subsystem_device || (subsystem_device == dev->subsystem_device))) { | |
e3adec72 | 5125 | *resize = true; |
644a544f KMEE |
5126 | if (align_order == -1) |
5127 | align = PAGE_SIZE; | |
5128 | else | |
5129 | align = 1 << align_order; | |
5130 | /* Found */ | |
32a9a682 YS |
5131 | break; |
5132 | } | |
5133 | } | |
644a544f KMEE |
5134 | else { |
5135 | if (sscanf(p, "%x:%x:%x.%x%n", | |
5136 | &seg, &bus, &slot, &func, &count) != 4) { | |
5137 | seg = 0; | |
5138 | if (sscanf(p, "%x:%x.%x%n", | |
5139 | &bus, &slot, &func, &count) != 3) { | |
5140 | /* Invalid format */ | |
5141 | printk(KERN_ERR "PCI: Can't parse resource_alignment parameter: %s\n", | |
5142 | p); | |
5143 | break; | |
5144 | } | |
5145 | } | |
5146 | p += count; | |
5147 | if (seg == pci_domain_nr(dev->bus) && | |
5148 | bus == dev->bus->number && | |
5149 | slot == PCI_SLOT(dev->devfn) && | |
5150 | func == PCI_FUNC(dev->devfn)) { | |
e3adec72 | 5151 | *resize = true; |
644a544f KMEE |
5152 | if (align_order == -1) |
5153 | align = PAGE_SIZE; | |
5154 | else | |
5155 | align = 1 << align_order; | |
5156 | /* Found */ | |
5157 | break; | |
5158 | } | |
32a9a682 YS |
5159 | } |
5160 | if (*p != ';' && *p != ',') { | |
5161 | /* End of param or invalid format */ | |
5162 | break; | |
5163 | } | |
5164 | p++; | |
5165 | } | |
f0b99f70 | 5166 | out: |
32a9a682 YS |
5167 | spin_unlock(&resource_alignment_lock); |
5168 | return align; | |
5169 | } | |
5170 | ||
81a5e70e | 5171 | static void pci_request_resource_alignment(struct pci_dev *dev, int bar, |
e3adec72 | 5172 | resource_size_t align, bool resize) |
81a5e70e BH |
5173 | { |
5174 | struct resource *r = &dev->resource[bar]; | |
5175 | resource_size_t size; | |
5176 | ||
5177 | if (!(r->flags & IORESOURCE_MEM)) | |
5178 | return; | |
5179 | ||
5180 | if (r->flags & IORESOURCE_PCI_FIXED) { | |
5181 | dev_info(&dev->dev, "BAR%d %pR: ignoring requested alignment %#llx\n", | |
5182 | bar, r, (unsigned long long)align); | |
5183 | return; | |
5184 | } | |
5185 | ||
5186 | size = resource_size(r); | |
0dde1c08 BH |
5187 | if (size >= align) |
5188 | return; | |
81a5e70e | 5189 | |
0dde1c08 | 5190 | /* |
e3adec72 YX |
5191 | * Increase the alignment of the resource. There are two ways we |
5192 | * can do this: | |
0dde1c08 | 5193 | * |
e3adec72 YX |
5194 | * 1) Increase the size of the resource. BARs are aligned on their |
5195 | * size, so when we reallocate space for this resource, we'll | |
5196 | * allocate it with the larger alignment. This also prevents | |
5197 | * assignment of any other BARs inside the alignment region, so | |
5198 | * if we're requesting page alignment, this means no other BARs | |
5199 | * will share the page. | |
5200 | * | |
5201 | * The disadvantage is that this makes the resource larger than | |
5202 | * the hardware BAR, which may break drivers that compute things | |
5203 | * based on the resource size, e.g., to find registers at a | |
5204 | * fixed offset before the end of the BAR. | |
5205 | * | |
5206 | * 2) Retain the resource size, but use IORESOURCE_STARTALIGN and | |
5207 | * set r->start to the desired alignment. By itself this | |
5208 | * doesn't prevent other BARs being put inside the alignment | |
5209 | * region, but if we realign *every* resource of every device in | |
5210 | * the system, none of them will share an alignment region. | |
5211 | * | |
5212 | * When the user has requested alignment for only some devices via | |
5213 | * the "pci=resource_alignment" argument, "resize" is true and we | |
5214 | * use the first method. Otherwise we assume we're aligning all | |
5215 | * devices and we use the second. | |
0dde1c08 | 5216 | */ |
e3adec72 | 5217 | |
0dde1c08 BH |
5218 | dev_info(&dev->dev, "BAR%d %pR: requesting alignment to %#llx\n", |
5219 | bar, r, (unsigned long long)align); | |
81a5e70e | 5220 | |
e3adec72 YX |
5221 | if (resize) { |
5222 | r->start = 0; | |
5223 | r->end = align - 1; | |
5224 | } else { | |
5225 | r->flags &= ~IORESOURCE_SIZEALIGN; | |
5226 | r->flags |= IORESOURCE_STARTALIGN; | |
5227 | r->start = align; | |
5228 | r->end = r->start + size - 1; | |
5229 | } | |
0dde1c08 | 5230 | r->flags |= IORESOURCE_UNSET; |
81a5e70e BH |
5231 | } |
5232 | ||
2069ecfb YL |
5233 | /* |
5234 | * This function disables memory decoding and releases memory resources | |
5235 | * of the device specified by kernel's boot parameter 'pci=resource_alignment='. | |
5236 | * It also rounds up size to specified alignment. | |
5237 | * Later on, the kernel will assign page-aligned memory resource back | |
5238 | * to the device. | |
5239 | */ | |
5240 | void pci_reassigndev_resource_alignment(struct pci_dev *dev) | |
5241 | { | |
5242 | int i; | |
5243 | struct resource *r; | |
81a5e70e | 5244 | resource_size_t align; |
2069ecfb | 5245 | u16 command; |
e3adec72 | 5246 | bool resize = false; |
2069ecfb | 5247 | |
62d9a78f YX |
5248 | /* |
5249 | * VF BARs are read-only zero according to SR-IOV spec r1.1, sec | |
5250 | * 3.4.1.11. Their resources are allocated from the space | |
5251 | * described by the VF BARx register in the PF's SR-IOV capability. | |
5252 | * We can't influence their alignment here. | |
5253 | */ | |
5254 | if (dev->is_virtfn) | |
5255 | return; | |
5256 | ||
10c463a7 | 5257 | /* check if specified PCI is target device to reassign */ |
e3adec72 | 5258 | align = pci_specified_resource_alignment(dev, &resize); |
10c463a7 | 5259 | if (!align) |
2069ecfb YL |
5260 | return; |
5261 | ||
5262 | if (dev->hdr_type == PCI_HEADER_TYPE_NORMAL && | |
5263 | (dev->class >> 8) == PCI_CLASS_BRIDGE_HOST) { | |
5264 | dev_warn(&dev->dev, | |
5265 | "Can't reassign resources to host bridge.\n"); | |
5266 | return; | |
5267 | } | |
5268 | ||
5269 | dev_info(&dev->dev, | |
5270 | "Disabling memory decoding and releasing memory resources.\n"); | |
5271 | pci_read_config_word(dev, PCI_COMMAND, &command); | |
5272 | command &= ~PCI_COMMAND_MEMORY; | |
5273 | pci_write_config_word(dev, PCI_COMMAND, command); | |
5274 | ||
81a5e70e | 5275 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) |
e3adec72 | 5276 | pci_request_resource_alignment(dev, i, align, resize); |
f0b99f70 | 5277 | |
81a5e70e BH |
5278 | /* |
5279 | * Need to disable bridge's resource window, | |
2069ecfb YL |
5280 | * to enable the kernel to reassign new resource |
5281 | * window later on. | |
5282 | */ | |
5283 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && | |
5284 | (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { | |
5285 | for (i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) { | |
5286 | r = &dev->resource[i]; | |
5287 | if (!(r->flags & IORESOURCE_MEM)) | |
5288 | continue; | |
bd064f0a | 5289 | r->flags |= IORESOURCE_UNSET; |
2069ecfb YL |
5290 | r->end = resource_size(r) - 1; |
5291 | r->start = 0; | |
5292 | } | |
5293 | pci_disable_bridge_window(dev); | |
5294 | } | |
5295 | } | |
5296 | ||
9738abed | 5297 | static ssize_t pci_set_resource_alignment_param(const char *buf, size_t count) |
32a9a682 YS |
5298 | { |
5299 | if (count > RESOURCE_ALIGNMENT_PARAM_SIZE - 1) | |
5300 | count = RESOURCE_ALIGNMENT_PARAM_SIZE - 1; | |
5301 | spin_lock(&resource_alignment_lock); | |
5302 | strncpy(resource_alignment_param, buf, count); | |
5303 | resource_alignment_param[count] = '\0'; | |
5304 | spin_unlock(&resource_alignment_lock); | |
5305 | return count; | |
5306 | } | |
5307 | ||
9738abed | 5308 | static ssize_t pci_get_resource_alignment_param(char *buf, size_t size) |
32a9a682 YS |
5309 | { |
5310 | size_t count; | |
5311 | spin_lock(&resource_alignment_lock); | |
5312 | count = snprintf(buf, size, "%s", resource_alignment_param); | |
5313 | spin_unlock(&resource_alignment_lock); | |
5314 | return count; | |
5315 | } | |
5316 | ||
5317 | static ssize_t pci_resource_alignment_show(struct bus_type *bus, char *buf) | |
5318 | { | |
5319 | return pci_get_resource_alignment_param(buf, PAGE_SIZE); | |
5320 | } | |
5321 | ||
5322 | static ssize_t pci_resource_alignment_store(struct bus_type *bus, | |
5323 | const char *buf, size_t count) | |
5324 | { | |
5325 | return pci_set_resource_alignment_param(buf, count); | |
5326 | } | |
5327 | ||
21751a9a | 5328 | static BUS_ATTR(resource_alignment, 0644, pci_resource_alignment_show, |
32a9a682 YS |
5329 | pci_resource_alignment_store); |
5330 | ||
5331 | static int __init pci_resource_alignment_sysfs_init(void) | |
5332 | { | |
5333 | return bus_create_file(&pci_bus_type, | |
5334 | &bus_attr_resource_alignment); | |
5335 | } | |
32a9a682 YS |
5336 | late_initcall(pci_resource_alignment_sysfs_init); |
5337 | ||
15856ad5 | 5338 | static void pci_no_domains(void) |
32a2eea7 JG |
5339 | { |
5340 | #ifdef CONFIG_PCI_DOMAINS | |
5341 | pci_domains_supported = 0; | |
5342 | #endif | |
5343 | } | |
5344 | ||
41e5c0f8 LD |
5345 | #ifdef CONFIG_PCI_DOMAINS |
5346 | static atomic_t __domain_nr = ATOMIC_INIT(-1); | |
5347 | ||
5348 | int pci_get_new_domain_nr(void) | |
5349 | { | |
5350 | return atomic_inc_return(&__domain_nr); | |
5351 | } | |
7c674700 LP |
5352 | |
5353 | #ifdef CONFIG_PCI_DOMAINS_GENERIC | |
1a4f93f7 | 5354 | static int of_pci_bus_find_domain_nr(struct device *parent) |
7c674700 LP |
5355 | { |
5356 | static int use_dt_domains = -1; | |
54c6e2dd | 5357 | int domain = -1; |
7c674700 | 5358 | |
54c6e2dd KHC |
5359 | if (parent) |
5360 | domain = of_get_pci_domain_nr(parent->of_node); | |
7c674700 LP |
5361 | /* |
5362 | * Check DT domain and use_dt_domains values. | |
5363 | * | |
5364 | * If DT domain property is valid (domain >= 0) and | |
5365 | * use_dt_domains != 0, the DT assignment is valid since this means | |
5366 | * we have not previously allocated a domain number by using | |
5367 | * pci_get_new_domain_nr(); we should also update use_dt_domains to | |
5368 | * 1, to indicate that we have just assigned a domain number from | |
5369 | * DT. | |
5370 | * | |
5371 | * If DT domain property value is not valid (ie domain < 0), and we | |
5372 | * have not previously assigned a domain number from DT | |
5373 | * (use_dt_domains != 1) we should assign a domain number by | |
5374 | * using the: | |
5375 | * | |
5376 | * pci_get_new_domain_nr() | |
5377 | * | |
5378 | * API and update the use_dt_domains value to keep track of method we | |
5379 | * are using to assign domain numbers (use_dt_domains = 0). | |
5380 | * | |
5381 | * All other combinations imply we have a platform that is trying | |
5382 | * to mix domain numbers obtained from DT and pci_get_new_domain_nr(), | |
5383 | * which is a recipe for domain mishandling and it is prevented by | |
5384 | * invalidating the domain value (domain = -1) and printing a | |
5385 | * corresponding error. | |
5386 | */ | |
5387 | if (domain >= 0 && use_dt_domains) { | |
5388 | use_dt_domains = 1; | |
5389 | } else if (domain < 0 && use_dt_domains != 1) { | |
5390 | use_dt_domains = 0; | |
5391 | domain = pci_get_new_domain_nr(); | |
5392 | } else { | |
5393 | dev_err(parent, "Node %s has inconsistent \"linux,pci-domain\" property in DT\n", | |
5394 | parent->of_node->full_name); | |
5395 | domain = -1; | |
5396 | } | |
5397 | ||
9c7cb891 | 5398 | return domain; |
7c674700 | 5399 | } |
1a4f93f7 TN |
5400 | |
5401 | int pci_bus_find_domain_nr(struct pci_bus *bus, struct device *parent) | |
5402 | { | |
2ab51dde TN |
5403 | return acpi_disabled ? of_pci_bus_find_domain_nr(parent) : |
5404 | acpi_pci_bus_find_domain_nr(bus); | |
7c674700 LP |
5405 | } |
5406 | #endif | |
41e5c0f8 LD |
5407 | #endif |
5408 | ||
0ef5f8f6 | 5409 | /** |
642c92da | 5410 | * pci_ext_cfg_avail - can we access extended PCI config space? |
0ef5f8f6 AP |
5411 | * |
5412 | * Returns 1 if we can access PCI extended config space (offsets | |
5413 | * greater than 0xff). This is the default implementation. Architecture | |
5414 | * implementations can override this. | |
5415 | */ | |
642c92da | 5416 | int __weak pci_ext_cfg_avail(void) |
0ef5f8f6 AP |
5417 | { |
5418 | return 1; | |
5419 | } | |
5420 | ||
2d1c8618 BH |
5421 | void __weak pci_fixup_cardbus(struct pci_bus *bus) |
5422 | { | |
5423 | } | |
5424 | EXPORT_SYMBOL(pci_fixup_cardbus); | |
5425 | ||
ad04d31e | 5426 | static int __init pci_setup(char *str) |
1da177e4 LT |
5427 | { |
5428 | while (str) { | |
5429 | char *k = strchr(str, ','); | |
5430 | if (k) | |
5431 | *k++ = 0; | |
5432 | if (*str && (str = pcibios_setup(str)) && *str) { | |
309e57df MW |
5433 | if (!strcmp(str, "nomsi")) { |
5434 | pci_no_msi(); | |
7f785763 RD |
5435 | } else if (!strcmp(str, "noaer")) { |
5436 | pci_no_aer(); | |
b55438fd YL |
5437 | } else if (!strncmp(str, "realloc=", 8)) { |
5438 | pci_realloc_get_opt(str + 8); | |
f483d392 | 5439 | } else if (!strncmp(str, "realloc", 7)) { |
b55438fd | 5440 | pci_realloc_get_opt("on"); |
32a2eea7 JG |
5441 | } else if (!strcmp(str, "nodomains")) { |
5442 | pci_no_domains(); | |
6748dcc2 RW |
5443 | } else if (!strncmp(str, "noari", 5)) { |
5444 | pcie_ari_disabled = true; | |
4516a618 AN |
5445 | } else if (!strncmp(str, "cbiosize=", 9)) { |
5446 | pci_cardbus_io_size = memparse(str + 9, &str); | |
5447 | } else if (!strncmp(str, "cbmemsize=", 10)) { | |
5448 | pci_cardbus_mem_size = memparse(str + 10, &str); | |
32a9a682 YS |
5449 | } else if (!strncmp(str, "resource_alignment=", 19)) { |
5450 | pci_set_resource_alignment_param(str + 19, | |
5451 | strlen(str + 19)); | |
43c16408 AP |
5452 | } else if (!strncmp(str, "ecrc=", 5)) { |
5453 | pcie_ecrc_get_policy(str + 5); | |
28760489 EB |
5454 | } else if (!strncmp(str, "hpiosize=", 9)) { |
5455 | pci_hotplug_io_size = memparse(str + 9, &str); | |
5456 | } else if (!strncmp(str, "hpmemsize=", 10)) { | |
5457 | pci_hotplug_mem_size = memparse(str + 10, &str); | |
e16b4660 KB |
5458 | } else if (!strncmp(str, "hpbussize=", 10)) { |
5459 | pci_hotplug_bus_size = | |
5460 | simple_strtoul(str + 10, &str, 0); | |
5461 | if (pci_hotplug_bus_size > 0xff) | |
5462 | pci_hotplug_bus_size = DEFAULT_HOTPLUG_BUS_SIZE; | |
5f39e670 JM |
5463 | } else if (!strncmp(str, "pcie_bus_tune_off", 17)) { |
5464 | pcie_bus_config = PCIE_BUS_TUNE_OFF; | |
b03e7495 JM |
5465 | } else if (!strncmp(str, "pcie_bus_safe", 13)) { |
5466 | pcie_bus_config = PCIE_BUS_SAFE; | |
5467 | } else if (!strncmp(str, "pcie_bus_perf", 13)) { | |
5468 | pcie_bus_config = PCIE_BUS_PERFORMANCE; | |
5f39e670 JM |
5469 | } else if (!strncmp(str, "pcie_bus_peer2peer", 18)) { |
5470 | pcie_bus_config = PCIE_BUS_PEER2PEER; | |
284f5f9d BH |
5471 | } else if (!strncmp(str, "pcie_scan_all", 13)) { |
5472 | pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS); | |
309e57df MW |
5473 | } else { |
5474 | printk(KERN_ERR "PCI: Unknown option `%s'\n", | |
5475 | str); | |
5476 | } | |
1da177e4 LT |
5477 | } |
5478 | str = k; | |
5479 | } | |
0637a70a | 5480 | return 0; |
1da177e4 | 5481 | } |
0637a70a | 5482 | early_param("pci", pci_setup); |