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1da177e4 LT |
1 | /* |
2 | * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $) | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or (at | |
12 | * your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
22 | * | |
23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/types.h> | |
d0020f65 | 30 | #include <linux/mutex.h> |
1da177e4 | 31 | #include <linux/pm.h> |
b67ea761 | 32 | #include <linux/pm_runtime.h> |
1da177e4 | 33 | #include <linux/pci.h> |
990a7ac5 | 34 | #include <linux/pci-acpi.h> |
eca67315 | 35 | #include <linux/pci-aspm.h> |
1da177e4 | 36 | #include <linux/acpi.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
1da177e4 LT |
38 | #include <acpi/acpi_bus.h> |
39 | #include <acpi/acpi_drivers.h> | |
415e12b2 | 40 | #include <acpi/apei.h> |
1da177e4 | 41 | |
ace8238b RW |
42 | #include "internal.h" |
43 | ||
a192a958 LB |
44 | #define PREFIX "ACPI: " |
45 | ||
1da177e4 | 46 | #define _COMPONENT ACPI_PCI_COMPONENT |
f52fd66d | 47 | ACPI_MODULE_NAME("pci_root"); |
1da177e4 | 48 | #define ACPI_PCI_ROOT_CLASS "pci_bridge" |
1da177e4 | 49 | #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" |
00c43b96 RW |
50 | static int acpi_pci_root_add(struct acpi_device *device, |
51 | const struct acpi_device_id *not_used); | |
52 | static void acpi_pci_root_remove(struct acpi_device *device); | |
1da177e4 | 53 | |
415e12b2 RW |
54 | #define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \ |
55 | | OSC_ACTIVE_STATE_PWR_SUPPORT \ | |
56 | | OSC_CLOCK_PWR_CAPABILITY_SUPPORT \ | |
57 | | OSC_MSI_SUPPORT) | |
58 | ||
c97adf9e | 59 | static const struct acpi_device_id root_device_ids[] = { |
1ba90e3a TR |
60 | {"PNP0A03", 0}, |
61 | {"", 0}, | |
62 | }; | |
1ba90e3a | 63 | |
00c43b96 | 64 | static struct acpi_scan_handler pci_root_handler = { |
1ba90e3a | 65 | .ids = root_device_ids, |
00c43b96 RW |
66 | .attach = acpi_pci_root_add, |
67 | .detach = acpi_pci_root_remove, | |
1da177e4 LT |
68 | }; |
69 | ||
63f10f0f | 70 | static DEFINE_MUTEX(osc_lock); |
1da177e4 | 71 | |
27558203 AC |
72 | /** |
73 | * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge | |
74 | * @handle - the ACPI CA node in question. | |
75 | * | |
76 | * Note: we could make this API take a struct acpi_device * instead, but | |
77 | * for now, it's more convenient to operate on an acpi_handle. | |
78 | */ | |
79 | int acpi_is_root_bridge(acpi_handle handle) | |
80 | { | |
81 | int ret; | |
82 | struct acpi_device *device; | |
83 | ||
84 | ret = acpi_bus_get_device(handle, &device); | |
85 | if (ret) | |
86 | return 0; | |
87 | ||
88 | ret = acpi_match_device_ids(device, root_device_ids); | |
89 | if (ret) | |
90 | return 0; | |
91 | else | |
92 | return 1; | |
93 | } | |
94 | EXPORT_SYMBOL_GPL(acpi_is_root_bridge); | |
95 | ||
1da177e4 | 96 | static acpi_status |
4be44fcd | 97 | get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) |
1da177e4 | 98 | { |
6ad95513 | 99 | struct resource *res = data; |
1da177e4 | 100 | struct acpi_resource_address64 address; |
f6c1c8ff | 101 | acpi_status status; |
1da177e4 | 102 | |
f6c1c8ff BH |
103 | status = acpi_resource_to_address64(resource, &address); |
104 | if (ACPI_FAILURE(status)) | |
1da177e4 LT |
105 | return AE_OK; |
106 | ||
4be44fcd | 107 | if ((address.address_length > 0) && |
6ad95513 BH |
108 | (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { |
109 | res->start = address.minimum; | |
110 | res->end = address.minimum + address.address_length - 1; | |
111 | } | |
1da177e4 LT |
112 | |
113 | return AE_OK; | |
114 | } | |
115 | ||
f5eebbe1 | 116 | static acpi_status try_get_root_bridge_busnr(acpi_handle handle, |
6ad95513 | 117 | struct resource *res) |
1da177e4 LT |
118 | { |
119 | acpi_status status; | |
120 | ||
6ad95513 | 121 | res->start = -1; |
4be44fcd LB |
122 | status = |
123 | acpi_walk_resources(handle, METHOD_NAME__CRS, | |
6ad95513 | 124 | get_root_bridge_busnr_callback, res); |
1da177e4 LT |
125 | if (ACPI_FAILURE(status)) |
126 | return status; | |
6ad95513 | 127 | if (res->start == -1) |
1da177e4 LT |
128 | return AE_ERROR; |
129 | return AE_OK; | |
130 | } | |
131 | ||
3a9622dc | 132 | static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; |
63f10f0f KK |
133 | |
134 | static acpi_status acpi_pci_run_osc(acpi_handle handle, | |
135 | const u32 *capbuf, u32 *retval) | |
136 | { | |
3a9622dc SL |
137 | struct acpi_osc_context context = { |
138 | .uuid_str = pci_osc_uuid_str, | |
139 | .rev = 1, | |
140 | .cap.length = 12, | |
141 | .cap.pointer = (void *)capbuf, | |
142 | }; | |
63f10f0f | 143 | acpi_status status; |
63f10f0f | 144 | |
3a9622dc SL |
145 | status = acpi_run_osc(handle, &context); |
146 | if (ACPI_SUCCESS(status)) { | |
147 | *retval = *((u32 *)(context.ret.pointer + 8)); | |
148 | kfree(context.ret.pointer); | |
63f10f0f | 149 | } |
63f10f0f KK |
150 | return status; |
151 | } | |
152 | ||
ab8e8957 RW |
153 | static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, |
154 | u32 support, | |
155 | u32 *control) | |
63f10f0f KK |
156 | { |
157 | acpi_status status; | |
ab8e8957 RW |
158 | u32 result, capbuf[3]; |
159 | ||
160 | support &= OSC_PCI_SUPPORT_MASKS; | |
161 | support |= root->osc_support_set; | |
63f10f0f | 162 | |
63f10f0f | 163 | capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; |
ab8e8957 RW |
164 | capbuf[OSC_SUPPORT_TYPE] = support; |
165 | if (control) { | |
166 | *control &= OSC_PCI_CONTROL_MASKS; | |
167 | capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set; | |
168 | } else { | |
545d6e18 YL |
169 | /* Run _OSC query only with existing controls. */ |
170 | capbuf[OSC_CONTROL_TYPE] = root->osc_control_set; | |
ab8e8957 | 171 | } |
63f10f0f KK |
172 | |
173 | status = acpi_pci_run_osc(root->device->handle, capbuf, &result); | |
174 | if (ACPI_SUCCESS(status)) { | |
ab8e8957 | 175 | root->osc_support_set = support; |
2b8fd918 | 176 | if (control) |
ab8e8957 | 177 | *control = result; |
63f10f0f KK |
178 | } |
179 | return status; | |
180 | } | |
181 | ||
182 | static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) | |
183 | { | |
184 | acpi_status status; | |
185 | acpi_handle tmp; | |
186 | ||
187 | status = acpi_get_handle(root->device->handle, "_OSC", &tmp); | |
188 | if (ACPI_FAILURE(status)) | |
189 | return status; | |
190 | mutex_lock(&osc_lock); | |
ab8e8957 | 191 | status = acpi_pci_query_osc(root, flags, NULL); |
63f10f0f KK |
192 | mutex_unlock(&osc_lock); |
193 | return status; | |
194 | } | |
195 | ||
76d56de5 | 196 | struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) |
63f10f0f KK |
197 | { |
198 | struct acpi_pci_root *root; | |
cd4faf9c | 199 | struct acpi_device *device; |
c1aec834 | 200 | |
cd4faf9c TI |
201 | if (acpi_bus_get_device(handle, &device) || |
202 | acpi_match_device_ids(device, root_device_ids)) | |
203 | return NULL; | |
204 | ||
205 | root = acpi_driver_data(device); | |
206 | ||
207 | return root; | |
63f10f0f | 208 | } |
76d56de5 | 209 | EXPORT_SYMBOL_GPL(acpi_pci_find_root); |
63f10f0f | 210 | |
2f7bbceb AC |
211 | struct acpi_handle_node { |
212 | struct list_head node; | |
213 | acpi_handle handle; | |
214 | }; | |
215 | ||
216 | /** | |
217 | * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev | |
218 | * @handle: the handle in question | |
219 | * | |
220 | * Given an ACPI CA handle, the desired PCI device is located in the | |
221 | * list of PCI devices. | |
222 | * | |
223 | * If the device is found, its reference count is increased and this | |
224 | * function returns a pointer to its data structure. The caller must | |
225 | * decrement the reference count by calling pci_dev_put(). | |
226 | * If no device is found, %NULL is returned. | |
227 | */ | |
228 | struct pci_dev *acpi_get_pci_dev(acpi_handle handle) | |
229 | { | |
230 | int dev, fn; | |
231 | unsigned long long adr; | |
232 | acpi_status status; | |
233 | acpi_handle phandle; | |
234 | struct pci_bus *pbus; | |
235 | struct pci_dev *pdev = NULL; | |
236 | struct acpi_handle_node *node, *tmp; | |
237 | struct acpi_pci_root *root; | |
238 | LIST_HEAD(device_list); | |
239 | ||
240 | /* | |
241 | * Walk up the ACPI CA namespace until we reach a PCI root bridge. | |
242 | */ | |
243 | phandle = handle; | |
244 | while (!acpi_is_root_bridge(phandle)) { | |
245 | node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); | |
246 | if (!node) | |
247 | goto out; | |
248 | ||
249 | INIT_LIST_HEAD(&node->node); | |
250 | node->handle = phandle; | |
251 | list_add(&node->node, &device_list); | |
252 | ||
253 | status = acpi_get_parent(phandle, &phandle); | |
254 | if (ACPI_FAILURE(status)) | |
255 | goto out; | |
256 | } | |
257 | ||
258 | root = acpi_pci_find_root(phandle); | |
259 | if (!root) | |
260 | goto out; | |
261 | ||
262 | pbus = root->bus; | |
263 | ||
264 | /* | |
265 | * Now, walk back down the PCI device tree until we return to our | |
266 | * original handle. Assumes that everything between the PCI root | |
267 | * bridge and the device we're looking for must be a P2P bridge. | |
268 | */ | |
269 | list_for_each_entry(node, &device_list, node) { | |
270 | acpi_handle hnd = node->handle; | |
271 | status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); | |
272 | if (ACPI_FAILURE(status)) | |
273 | goto out; | |
274 | dev = (adr >> 16) & 0xffff; | |
275 | fn = adr & 0xffff; | |
276 | ||
277 | pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); | |
412af978 | 278 | if (!pdev || hnd == handle) |
2f7bbceb AC |
279 | break; |
280 | ||
281 | pbus = pdev->subordinate; | |
282 | pci_dev_put(pdev); | |
497fb54f RW |
283 | |
284 | /* | |
285 | * This function may be called for a non-PCI device that has a | |
286 | * PCI parent (eg. a disk under a PCI SATA controller). In that | |
287 | * case pdev->subordinate will be NULL for the parent. | |
288 | */ | |
289 | if (!pbus) { | |
290 | dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); | |
291 | pdev = NULL; | |
292 | break; | |
293 | } | |
2f7bbceb AC |
294 | } |
295 | out: | |
296 | list_for_each_entry_safe(node, tmp, &device_list, node) | |
297 | kfree(node); | |
298 | ||
299 | return pdev; | |
300 | } | |
301 | EXPORT_SYMBOL_GPL(acpi_get_pci_dev); | |
302 | ||
63f10f0f | 303 | /** |
75fb60f2 RW |
304 | * acpi_pci_osc_control_set - Request control of PCI root _OSC features. |
305 | * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). | |
306 | * @mask: Mask of _OSC bits to request control of, place to store control mask. | |
307 | * @req: Mask of _OSC bits the control of is essential to the caller. | |
63f10f0f | 308 | * |
75fb60f2 RW |
309 | * Run _OSC query for @mask and if that is successful, compare the returned |
310 | * mask of control bits with @req. If all of the @req bits are set in the | |
311 | * returned mask, run _OSC request for it. | |
312 | * | |
313 | * The variable at the @mask address may be modified regardless of whether or | |
314 | * not the function returns success. On success it will contain the mask of | |
315 | * _OSC bits the BIOS has granted control of, but its contents are meaningless | |
316 | * on failure. | |
63f10f0f | 317 | **/ |
75fb60f2 | 318 | acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) |
63f10f0f | 319 | { |
75fb60f2 | 320 | struct acpi_pci_root *root; |
63f10f0f | 321 | acpi_status status; |
75fb60f2 | 322 | u32 ctrl, capbuf[3]; |
63f10f0f | 323 | acpi_handle tmp; |
63f10f0f | 324 | |
75fb60f2 RW |
325 | if (!mask) |
326 | return AE_BAD_PARAMETER; | |
327 | ||
328 | ctrl = *mask & OSC_PCI_CONTROL_MASKS; | |
329 | if ((ctrl & req) != req) | |
63f10f0f KK |
330 | return AE_TYPE; |
331 | ||
332 | root = acpi_pci_find_root(handle); | |
333 | if (!root) | |
334 | return AE_NOT_EXIST; | |
335 | ||
b879dc4b RW |
336 | status = acpi_get_handle(handle, "_OSC", &tmp); |
337 | if (ACPI_FAILURE(status)) | |
338 | return status; | |
339 | ||
63f10f0f | 340 | mutex_lock(&osc_lock); |
75fb60f2 RW |
341 | |
342 | *mask = ctrl | root->osc_control_set; | |
63f10f0f | 343 | /* No need to evaluate _OSC if the control was already granted. */ |
75fb60f2 | 344 | if ((root->osc_control_set & ctrl) == ctrl) |
63f10f0f KK |
345 | goto out; |
346 | ||
75fb60f2 RW |
347 | /* Need to check the available controls bits before requesting them. */ |
348 | while (*mask) { | |
349 | status = acpi_pci_query_osc(root, root->osc_support_set, mask); | |
350 | if (ACPI_FAILURE(status)) | |
351 | goto out; | |
352 | if (ctrl == *mask) | |
353 | break; | |
354 | ctrl = *mask; | |
355 | } | |
2b8fd918 | 356 | |
75fb60f2 | 357 | if ((ctrl & req) != req) { |
63f10f0f KK |
358 | status = AE_SUPPORT; |
359 | goto out; | |
360 | } | |
361 | ||
362 | capbuf[OSC_QUERY_TYPE] = 0; | |
363 | capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set; | |
75fb60f2 RW |
364 | capbuf[OSC_CONTROL_TYPE] = ctrl; |
365 | status = acpi_pci_run_osc(handle, capbuf, mask); | |
63f10f0f | 366 | if (ACPI_SUCCESS(status)) |
75fb60f2 | 367 | root->osc_control_set = *mask; |
63f10f0f KK |
368 | out: |
369 | mutex_unlock(&osc_lock); | |
370 | return status; | |
371 | } | |
9f5404d8 | 372 | EXPORT_SYMBOL(acpi_pci_osc_control_set); |
63f10f0f | 373 | |
00c43b96 RW |
374 | static int acpi_pci_root_add(struct acpi_device *device, |
375 | const struct acpi_device_id *not_used) | |
1da177e4 | 376 | { |
f5eebbe1 BH |
377 | unsigned long long segment, bus; |
378 | acpi_status status; | |
379 | int result; | |
380 | struct acpi_pci_root *root; | |
0ef5f8f6 | 381 | u32 flags, base_flags; |
bfe2414a | 382 | acpi_handle handle = device->handle; |
3dc48af3 | 383 | bool no_aspm = false, clear_aspm = false; |
1da177e4 | 384 | |
6ad95513 BH |
385 | root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); |
386 | if (!root) | |
387 | return -ENOMEM; | |
388 | ||
f5eebbe1 | 389 | segment = 0; |
bfe2414a | 390 | status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, |
f5eebbe1 BH |
391 | &segment); |
392 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
6dc7d22c | 393 | dev_err(&device->dev, "can't evaluate _SEG\n"); |
6ad95513 BH |
394 | result = -ENODEV; |
395 | goto end; | |
f5eebbe1 | 396 | } |
1da177e4 | 397 | |
f5eebbe1 | 398 | /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ |
6ad95513 | 399 | root->secondary.flags = IORESOURCE_BUS; |
bfe2414a | 400 | status = try_get_root_bridge_busnr(handle, &root->secondary); |
f5eebbe1 | 401 | if (ACPI_FAILURE(status)) { |
6ad95513 BH |
402 | /* |
403 | * We need both the start and end of the downstream bus range | |
404 | * to interpret _CBA (MMCONFIG base address), so it really is | |
405 | * supposed to be in _CRS. If we don't find it there, all we | |
406 | * can do is assume [_BBN-0xFF] or [0-0xFF]. | |
407 | */ | |
408 | root->secondary.end = 0xFF; | |
6dc7d22c JL |
409 | dev_warn(&device->dev, |
410 | FW_BUG "no secondary bus range in _CRS\n"); | |
bfe2414a | 411 | status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, |
e545b55a | 412 | NULL, &bus); |
6ad95513 BH |
413 | if (ACPI_SUCCESS(status)) |
414 | root->secondary.start = bus; | |
415 | else if (status == AE_NOT_FOUND) | |
416 | root->secondary.start = 0; | |
417 | else { | |
6dc7d22c | 418 | dev_err(&device->dev, "can't evaluate _BBN\n"); |
6ad95513 BH |
419 | result = -ENODEV; |
420 | goto end; | |
f5eebbe1 BH |
421 | } |
422 | } | |
1da177e4 | 423 | |
32917e5b | 424 | root->device = device; |
0705495d | 425 | root->segment = segment & 0xFFFF; |
1da177e4 LT |
426 | strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); |
427 | strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); | |
db89b4f0 | 428 | device->driver_data = root; |
1da177e4 | 429 | |
6dc7d22c | 430 | pr_info(PREFIX "%s [%s] (domain %04x %pR)\n", |
4be44fcd | 431 | acpi_device_name(device), acpi_device_bid(device), |
6ad95513 | 432 | root->segment, &root->secondary); |
1da177e4 | 433 | |
bfe2414a | 434 | root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); |
1da177e4 | 435 | |
2786f6e3 | 436 | /* |
990a7ac5 AP |
437 | * All supported architectures that use ACPI have support for |
438 | * PCI domains, so we indicate this in _OSC support capabilities. | |
2786f6e3 | 439 | */ |
0ef5f8f6 | 440 | flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT; |
63f10f0f | 441 | acpi_pci_osc_support(root, flags); |
2786f6e3 | 442 | |
8c33f51d | 443 | if (pci_ext_cfg_avail()) |
0ef5f8f6 | 444 | flags |= OSC_EXT_PCI_CONFIG_SUPPORT; |
8c33f51d | 445 | if (pcie_aspm_support_enabled()) { |
3e1b1600 | 446 | flags |= OSC_ACTIVE_STATE_PWR_SUPPORT | |
8c33f51d TI |
447 | OSC_CLOCK_PWR_CAPABILITY_SUPPORT; |
448 | } | |
07ae95f9 AP |
449 | if (pci_msi_enabled()) |
450 | flags |= OSC_MSI_SUPPORT; | |
2d9c8677 RW |
451 | if (flags != base_flags) { |
452 | status = acpi_pci_osc_support(root, flags); | |
453 | if (ACPI_FAILURE(status)) { | |
8c33f51d | 454 | dev_info(&device->dev, "ACPI _OSC support " |
2d9c8677 | 455 | "notification failed, disabling PCIe ASPM\n"); |
3dc48af3 | 456 | no_aspm = true; |
2d9c8677 RW |
457 | flags = base_flags; |
458 | } | |
459 | } | |
b8178f13 | 460 | |
415e12b2 RW |
461 | if (!pcie_ports_disabled |
462 | && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) { | |
463 | flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL | |
464 | | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL | |
465 | | OSC_PCI_EXPRESS_PME_CONTROL; | |
466 | ||
467 | if (pci_aer_available()) { | |
468 | if (aer_acpi_firmware_first()) | |
8c33f51d | 469 | dev_dbg(&device->dev, |
415e12b2 RW |
470 | "PCIe errors handled by BIOS.\n"); |
471 | else | |
472 | flags |= OSC_PCI_EXPRESS_AER_CONTROL; | |
473 | } | |
474 | ||
8c33f51d | 475 | dev_info(&device->dev, |
415e12b2 RW |
476 | "Requesting ACPI _OSC control (0x%02x)\n", flags); |
477 | ||
bfe2414a | 478 | status = acpi_pci_osc_control_set(handle, &flags, |
8c33f51d | 479 | OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); |
eca67315 | 480 | if (ACPI_SUCCESS(status)) { |
8c33f51d | 481 | dev_info(&device->dev, |
415e12b2 | 482 | "ACPI _OSC control (0x%02x) granted\n", flags); |
b8178f13 BH |
483 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
484 | /* | |
485 | * We have ASPM control, but the FADT indicates | |
486 | * that it's unsupported. Clear it. | |
487 | */ | |
3dc48af3 | 488 | clear_aspm = true; |
b8178f13 | 489 | } |
eca67315 | 490 | } else { |
8c33f51d | 491 | dev_info(&device->dev, |
a246670d RW |
492 | "ACPI _OSC request failed (%s), " |
493 | "returned control mask: 0x%02x\n", | |
494 | acpi_format_exception(status), flags); | |
6dc7d22c JL |
495 | dev_info(&device->dev, |
496 | "ACPI _OSC control for PCIe not granted, disabling ASPM\n"); | |
3dc48af3 NH |
497 | /* |
498 | * We want to disable ASPM here, but aspm_disabled | |
499 | * needs to remain in its state from boot so that we | |
500 | * properly handle PCIe 1.1 devices. So we set this | |
501 | * flag here, to defer the action until after the ACPI | |
502 | * root scan. | |
503 | */ | |
504 | no_aspm = true; | |
eca67315 | 505 | } |
a246670d | 506 | } else { |
8c33f51d | 507 | dev_info(&device->dev, |
b8178f13 BH |
508 | "Unable to request _OSC control " |
509 | "(_OSC support mask: 0x%02x)\n", flags); | |
415e12b2 RW |
510 | } |
511 | ||
3dc48af3 NH |
512 | /* |
513 | * TBD: Need PCI interface for enumeration/configuration of roots. | |
514 | */ | |
515 | ||
516 | /* | |
517 | * Scan the Root Bridge | |
518 | * -------------------- | |
519 | * Must do this prior to any attempt to bind the root device, as the | |
520 | * PCI namespace does not get created until this call is made (and | |
521 | * thus the root bridge's pci_dev does not exist). | |
522 | */ | |
523 | root->bus = pci_acpi_scan_root(root); | |
524 | if (!root->bus) { | |
525 | dev_err(&device->dev, | |
526 | "Bus %04x:%02x not present in PCI namespace\n", | |
527 | root->segment, (unsigned int)root->secondary.start); | |
f516bde5 | 528 | device->driver_data = NULL; |
3dc48af3 NH |
529 | result = -ENODEV; |
530 | goto end; | |
531 | } | |
532 | ||
533 | if (clear_aspm) { | |
534 | dev_info(&device->dev, "Disabling ASPM (FADT indicates it is unsupported)\n"); | |
535 | pcie_clear_aspm(root->bus); | |
536 | } | |
537 | if (no_aspm) | |
538 | pcie_no_aspm(); | |
539 | ||
b67ea761 RW |
540 | pci_acpi_add_bus_pm_notifier(device, root->bus); |
541 | if (device->wakeup.flags.run_wake) | |
542 | device_set_run_wake(root->bus->bridge, true); | |
543 | ||
3c449ed0 YL |
544 | if (system_state != SYSTEM_BOOTING) { |
545 | pcibios_resource_survey_bus(root->bus); | |
39772038 | 546 | pci_assign_unassigned_root_bus_resources(root->bus); |
516ca223 | 547 | } |
62a08c5a | 548 | |
caf420c6 | 549 | pci_bus_add_devices(root->bus); |
00c43b96 | 550 | return 1; |
47525cda | 551 | |
47525cda RW |
552 | end: |
553 | kfree(root); | |
554 | return result; | |
c431ada4 | 555 | } |
1da177e4 | 556 | |
00c43b96 | 557 | static void acpi_pci_root_remove(struct acpi_device *device) |
1da177e4 | 558 | { |
caf420c6 | 559 | struct acpi_pci_root *root = acpi_driver_data(device); |
c8e9afb1 | 560 | |
9738a1fd YL |
561 | pci_stop_root_bus(root->bus); |
562 | ||
b67ea761 RW |
563 | device_set_run_wake(root->bus->bridge, false); |
564 | pci_acpi_remove_bus_pm_notifier(device); | |
565 | ||
9738a1fd YL |
566 | pci_remove_root_bus(root->bus); |
567 | ||
1da177e4 | 568 | kfree(root); |
1da177e4 LT |
569 | } |
570 | ||
00c43b96 | 571 | void __init acpi_pci_root_init(void) |
1da177e4 | 572 | { |
d3072e6a RW |
573 | acpi_hest_init(); |
574 | ||
00c43b96 RW |
575 | if (!acpi_pci_disabled) { |
576 | pci_acpi_crs_quirks(); | |
577 | acpi_scan_add_handler(&pci_root_handler); | |
578 | } | |
1da177e4 | 579 | } |
668192b6 YL |
580 | /* Support root bridge hotplug */ |
581 | ||
582 | static void handle_root_bridge_insertion(acpi_handle handle) | |
583 | { | |
584 | struct acpi_device *device; | |
585 | ||
586 | if (!acpi_bus_get_device(handle, &device)) { | |
6dc7d22c JL |
587 | dev_printk(KERN_DEBUG, &device->dev, |
588 | "acpi device already exists; ignoring notify\n"); | |
668192b6 YL |
589 | return; |
590 | } | |
591 | ||
592 | if (acpi_bus_scan(handle)) | |
6dc7d22c | 593 | acpi_handle_err(handle, "cannot add bridge to acpi list\n"); |
668192b6 YL |
594 | } |
595 | ||
7b98118a | 596 | static void hotplug_event_root(void *data, u32 type) |
668192b6 | 597 | { |
7b98118a | 598 | acpi_handle handle = data; |
668192b6 | 599 | struct acpi_pci_root *root; |
668192b6 | 600 | |
b8b66110 | 601 | acpi_scan_lock_acquire(); |
668192b6 | 602 | |
b8b66110 | 603 | root = acpi_pci_find_root(handle); |
668192b6 YL |
604 | |
605 | switch (type) { | |
606 | case ACPI_NOTIFY_BUS_CHECK: | |
607 | /* bus enumerate */ | |
6dc7d22c JL |
608 | acpi_handle_printk(KERN_DEBUG, handle, |
609 | "Bus check notify on %s\n", __func__); | |
3f327e39 YL |
610 | if (root) |
611 | acpiphp_check_host_bridge(handle); | |
612 | else | |
668192b6 YL |
613 | handle_root_bridge_insertion(handle); |
614 | ||
615 | break; | |
616 | ||
617 | case ACPI_NOTIFY_DEVICE_CHECK: | |
618 | /* device check */ | |
6dc7d22c JL |
619 | acpi_handle_printk(KERN_DEBUG, handle, |
620 | "Device check notify on %s\n", __func__); | |
668192b6 YL |
621 | if (!root) |
622 | handle_root_bridge_insertion(handle); | |
623 | break; | |
624 | ||
625 | case ACPI_NOTIFY_EJECT_REQUEST: | |
626 | /* request device eject */ | |
6dc7d22c JL |
627 | acpi_handle_printk(KERN_DEBUG, handle, |
628 | "Device eject notify on %s\n", __func__); | |
43d38883 RW |
629 | if (!root) |
630 | break; | |
631 | ||
632 | get_device(&root->device->dev); | |
633 | ||
634 | acpi_scan_lock_release(); | |
635 | ||
636 | acpi_bus_device_eject(root->device, ACPI_NOTIFY_EJECT_REQUEST); | |
637 | return; | |
668192b6 | 638 | default: |
6dc7d22c JL |
639 | acpi_handle_warn(handle, |
640 | "notify_handler: unknown event type 0x%x\n", | |
641 | type); | |
668192b6 YL |
642 | break; |
643 | } | |
644 | ||
b8b66110 | 645 | acpi_scan_lock_release(); |
668192b6 YL |
646 | } |
647 | ||
648 | static void handle_hotplug_event_root(acpi_handle handle, u32 type, | |
649 | void *context) | |
650 | { | |
7b98118a | 651 | acpi_hotplug_execute(hotplug_event_root, handle, type); |
668192b6 YL |
652 | } |
653 | ||
654 | static acpi_status __init | |
655 | find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) | |
656 | { | |
121b090e | 657 | acpi_status status; |
668192b6 YL |
658 | int *count = (int *)context; |
659 | ||
660 | if (!acpi_is_root_bridge(handle)) | |
661 | return AE_OK; | |
662 | ||
663 | (*count)++; | |
664 | ||
121b090e TC |
665 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
666 | handle_hotplug_event_root, NULL); | |
667 | if (ACPI_FAILURE(status)) | |
6dc7d22c JL |
668 | acpi_handle_printk(KERN_DEBUG, handle, |
669 | "notify handler is not installed, exit status: %u\n", | |
670 | (unsigned int)status); | |
121b090e | 671 | else |
6dc7d22c JL |
672 | acpi_handle_printk(KERN_DEBUG, handle, |
673 | "notify handler is installed\n"); | |
668192b6 YL |
674 | |
675 | return AE_OK; | |
676 | } | |
677 | ||
678 | void __init acpi_pci_root_hp_init(void) | |
679 | { | |
680 | int num = 0; | |
681 | ||
682 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
683 | ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL); | |
684 | ||
685 | printk(KERN_DEBUG "Found %d acpi root devices\n", num); | |
686 | } |