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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 | |
a192a958 LB |
42 | #define PREFIX "ACPI: " |
43 | ||
1da177e4 | 44 | #define _COMPONENT ACPI_PCI_COMPONENT |
f52fd66d | 45 | ACPI_MODULE_NAME("pci_root"); |
1da177e4 | 46 | #define ACPI_PCI_ROOT_CLASS "pci_bridge" |
1da177e4 | 47 | #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" |
00c43b96 RW |
48 | static int acpi_pci_root_add(struct acpi_device *device, |
49 | const struct acpi_device_id *not_used); | |
50 | static void acpi_pci_root_remove(struct acpi_device *device); | |
1da177e4 | 51 | |
415e12b2 RW |
52 | #define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \ |
53 | | OSC_ACTIVE_STATE_PWR_SUPPORT \ | |
54 | | OSC_CLOCK_PWR_CAPABILITY_SUPPORT \ | |
55 | | OSC_MSI_SUPPORT) | |
56 | ||
c97adf9e | 57 | static const struct acpi_device_id root_device_ids[] = { |
1ba90e3a TR |
58 | {"PNP0A03", 0}, |
59 | {"", 0}, | |
60 | }; | |
1ba90e3a | 61 | |
00c43b96 | 62 | static struct acpi_scan_handler pci_root_handler = { |
1ba90e3a | 63 | .ids = root_device_ids, |
00c43b96 RW |
64 | .attach = acpi_pci_root_add, |
65 | .detach = acpi_pci_root_remove, | |
1da177e4 LT |
66 | }; |
67 | ||
63f10f0f | 68 | static DEFINE_MUTEX(osc_lock); |
1da177e4 | 69 | |
27558203 AC |
70 | /** |
71 | * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge | |
72 | * @handle - the ACPI CA node in question. | |
73 | * | |
74 | * Note: we could make this API take a struct acpi_device * instead, but | |
75 | * for now, it's more convenient to operate on an acpi_handle. | |
76 | */ | |
77 | int acpi_is_root_bridge(acpi_handle handle) | |
78 | { | |
79 | int ret; | |
80 | struct acpi_device *device; | |
81 | ||
82 | ret = acpi_bus_get_device(handle, &device); | |
83 | if (ret) | |
84 | return 0; | |
85 | ||
86 | ret = acpi_match_device_ids(device, root_device_ids); | |
87 | if (ret) | |
88 | return 0; | |
89 | else | |
90 | return 1; | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(acpi_is_root_bridge); | |
93 | ||
1da177e4 | 94 | static acpi_status |
4be44fcd | 95 | get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) |
1da177e4 | 96 | { |
6ad95513 | 97 | struct resource *res = data; |
1da177e4 | 98 | struct acpi_resource_address64 address; |
f6c1c8ff | 99 | acpi_status status; |
1da177e4 | 100 | |
f6c1c8ff BH |
101 | status = acpi_resource_to_address64(resource, &address); |
102 | if (ACPI_FAILURE(status)) | |
1da177e4 LT |
103 | return AE_OK; |
104 | ||
4be44fcd | 105 | if ((address.address_length > 0) && |
6ad95513 BH |
106 | (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { |
107 | res->start = address.minimum; | |
108 | res->end = address.minimum + address.address_length - 1; | |
109 | } | |
1da177e4 LT |
110 | |
111 | return AE_OK; | |
112 | } | |
113 | ||
f5eebbe1 | 114 | static acpi_status try_get_root_bridge_busnr(acpi_handle handle, |
6ad95513 | 115 | struct resource *res) |
1da177e4 LT |
116 | { |
117 | acpi_status status; | |
118 | ||
6ad95513 | 119 | res->start = -1; |
4be44fcd LB |
120 | status = |
121 | acpi_walk_resources(handle, METHOD_NAME__CRS, | |
6ad95513 | 122 | get_root_bridge_busnr_callback, res); |
1da177e4 LT |
123 | if (ACPI_FAILURE(status)) |
124 | return status; | |
6ad95513 | 125 | if (res->start == -1) |
1da177e4 LT |
126 | return AE_ERROR; |
127 | return AE_OK; | |
128 | } | |
129 | ||
3a9622dc | 130 | static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; |
63f10f0f KK |
131 | |
132 | static acpi_status acpi_pci_run_osc(acpi_handle handle, | |
133 | const u32 *capbuf, u32 *retval) | |
134 | { | |
3a9622dc SL |
135 | struct acpi_osc_context context = { |
136 | .uuid_str = pci_osc_uuid_str, | |
137 | .rev = 1, | |
138 | .cap.length = 12, | |
139 | .cap.pointer = (void *)capbuf, | |
140 | }; | |
63f10f0f | 141 | acpi_status status; |
63f10f0f | 142 | |
3a9622dc SL |
143 | status = acpi_run_osc(handle, &context); |
144 | if (ACPI_SUCCESS(status)) { | |
145 | *retval = *((u32 *)(context.ret.pointer + 8)); | |
146 | kfree(context.ret.pointer); | |
63f10f0f | 147 | } |
63f10f0f KK |
148 | return status; |
149 | } | |
150 | ||
ab8e8957 RW |
151 | static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, |
152 | u32 support, | |
153 | u32 *control) | |
63f10f0f KK |
154 | { |
155 | acpi_status status; | |
ab8e8957 RW |
156 | u32 result, capbuf[3]; |
157 | ||
158 | support &= OSC_PCI_SUPPORT_MASKS; | |
159 | support |= root->osc_support_set; | |
63f10f0f | 160 | |
63f10f0f | 161 | capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; |
ab8e8957 RW |
162 | capbuf[OSC_SUPPORT_TYPE] = support; |
163 | if (control) { | |
164 | *control &= OSC_PCI_CONTROL_MASKS; | |
165 | capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set; | |
166 | } else { | |
545d6e18 YL |
167 | /* Run _OSC query only with existing controls. */ |
168 | capbuf[OSC_CONTROL_TYPE] = root->osc_control_set; | |
ab8e8957 | 169 | } |
63f10f0f KK |
170 | |
171 | status = acpi_pci_run_osc(root->device->handle, capbuf, &result); | |
172 | if (ACPI_SUCCESS(status)) { | |
ab8e8957 | 173 | root->osc_support_set = support; |
2b8fd918 | 174 | if (control) |
ab8e8957 | 175 | *control = result; |
63f10f0f KK |
176 | } |
177 | return status; | |
178 | } | |
179 | ||
180 | static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) | |
181 | { | |
182 | acpi_status status; | |
183 | acpi_handle tmp; | |
184 | ||
185 | status = acpi_get_handle(root->device->handle, "_OSC", &tmp); | |
186 | if (ACPI_FAILURE(status)) | |
187 | return status; | |
188 | mutex_lock(&osc_lock); | |
ab8e8957 | 189 | status = acpi_pci_query_osc(root, flags, NULL); |
63f10f0f KK |
190 | mutex_unlock(&osc_lock); |
191 | return status; | |
192 | } | |
193 | ||
76d56de5 | 194 | struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) |
63f10f0f KK |
195 | { |
196 | struct acpi_pci_root *root; | |
cd4faf9c | 197 | struct acpi_device *device; |
c1aec834 | 198 | |
cd4faf9c TI |
199 | if (acpi_bus_get_device(handle, &device) || |
200 | acpi_match_device_ids(device, root_device_ids)) | |
201 | return NULL; | |
202 | ||
203 | root = acpi_driver_data(device); | |
204 | ||
205 | return root; | |
63f10f0f | 206 | } |
76d56de5 | 207 | EXPORT_SYMBOL_GPL(acpi_pci_find_root); |
63f10f0f | 208 | |
2f7bbceb AC |
209 | struct acpi_handle_node { |
210 | struct list_head node; | |
211 | acpi_handle handle; | |
212 | }; | |
213 | ||
214 | /** | |
215 | * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev | |
216 | * @handle: the handle in question | |
217 | * | |
218 | * Given an ACPI CA handle, the desired PCI device is located in the | |
219 | * list of PCI devices. | |
220 | * | |
221 | * If the device is found, its reference count is increased and this | |
222 | * function returns a pointer to its data structure. The caller must | |
223 | * decrement the reference count by calling pci_dev_put(). | |
224 | * If no device is found, %NULL is returned. | |
225 | */ | |
226 | struct pci_dev *acpi_get_pci_dev(acpi_handle handle) | |
227 | { | |
228 | int dev, fn; | |
229 | unsigned long long adr; | |
230 | acpi_status status; | |
231 | acpi_handle phandle; | |
232 | struct pci_bus *pbus; | |
233 | struct pci_dev *pdev = NULL; | |
234 | struct acpi_handle_node *node, *tmp; | |
235 | struct acpi_pci_root *root; | |
236 | LIST_HEAD(device_list); | |
237 | ||
238 | /* | |
239 | * Walk up the ACPI CA namespace until we reach a PCI root bridge. | |
240 | */ | |
241 | phandle = handle; | |
242 | while (!acpi_is_root_bridge(phandle)) { | |
243 | node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); | |
244 | if (!node) | |
245 | goto out; | |
246 | ||
247 | INIT_LIST_HEAD(&node->node); | |
248 | node->handle = phandle; | |
249 | list_add(&node->node, &device_list); | |
250 | ||
251 | status = acpi_get_parent(phandle, &phandle); | |
252 | if (ACPI_FAILURE(status)) | |
253 | goto out; | |
254 | } | |
255 | ||
256 | root = acpi_pci_find_root(phandle); | |
257 | if (!root) | |
258 | goto out; | |
259 | ||
260 | pbus = root->bus; | |
261 | ||
262 | /* | |
263 | * Now, walk back down the PCI device tree until we return to our | |
264 | * original handle. Assumes that everything between the PCI root | |
265 | * bridge and the device we're looking for must be a P2P bridge. | |
266 | */ | |
267 | list_for_each_entry(node, &device_list, node) { | |
268 | acpi_handle hnd = node->handle; | |
269 | status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); | |
270 | if (ACPI_FAILURE(status)) | |
271 | goto out; | |
272 | dev = (adr >> 16) & 0xffff; | |
273 | fn = adr & 0xffff; | |
274 | ||
275 | pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); | |
412af978 | 276 | if (!pdev || hnd == handle) |
2f7bbceb AC |
277 | break; |
278 | ||
279 | pbus = pdev->subordinate; | |
280 | pci_dev_put(pdev); | |
497fb54f RW |
281 | |
282 | /* | |
283 | * This function may be called for a non-PCI device that has a | |
284 | * PCI parent (eg. a disk under a PCI SATA controller). In that | |
285 | * case pdev->subordinate will be NULL for the parent. | |
286 | */ | |
287 | if (!pbus) { | |
288 | dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); | |
289 | pdev = NULL; | |
290 | break; | |
291 | } | |
2f7bbceb AC |
292 | } |
293 | out: | |
294 | list_for_each_entry_safe(node, tmp, &device_list, node) | |
295 | kfree(node); | |
296 | ||
297 | return pdev; | |
298 | } | |
299 | EXPORT_SYMBOL_GPL(acpi_get_pci_dev); | |
300 | ||
63f10f0f | 301 | /** |
75fb60f2 RW |
302 | * acpi_pci_osc_control_set - Request control of PCI root _OSC features. |
303 | * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). | |
304 | * @mask: Mask of _OSC bits to request control of, place to store control mask. | |
305 | * @req: Mask of _OSC bits the control of is essential to the caller. | |
63f10f0f | 306 | * |
75fb60f2 RW |
307 | * Run _OSC query for @mask and if that is successful, compare the returned |
308 | * mask of control bits with @req. If all of the @req bits are set in the | |
309 | * returned mask, run _OSC request for it. | |
310 | * | |
311 | * The variable at the @mask address may be modified regardless of whether or | |
312 | * not the function returns success. On success it will contain the mask of | |
313 | * _OSC bits the BIOS has granted control of, but its contents are meaningless | |
314 | * on failure. | |
63f10f0f | 315 | **/ |
75fb60f2 | 316 | acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) |
63f10f0f | 317 | { |
75fb60f2 | 318 | struct acpi_pci_root *root; |
63f10f0f | 319 | acpi_status status; |
75fb60f2 | 320 | u32 ctrl, capbuf[3]; |
63f10f0f | 321 | acpi_handle tmp; |
63f10f0f | 322 | |
75fb60f2 RW |
323 | if (!mask) |
324 | return AE_BAD_PARAMETER; | |
325 | ||
326 | ctrl = *mask & OSC_PCI_CONTROL_MASKS; | |
327 | if ((ctrl & req) != req) | |
63f10f0f KK |
328 | return AE_TYPE; |
329 | ||
330 | root = acpi_pci_find_root(handle); | |
331 | if (!root) | |
332 | return AE_NOT_EXIST; | |
333 | ||
b879dc4b RW |
334 | status = acpi_get_handle(handle, "_OSC", &tmp); |
335 | if (ACPI_FAILURE(status)) | |
336 | return status; | |
337 | ||
63f10f0f | 338 | mutex_lock(&osc_lock); |
75fb60f2 RW |
339 | |
340 | *mask = ctrl | root->osc_control_set; | |
63f10f0f | 341 | /* No need to evaluate _OSC if the control was already granted. */ |
75fb60f2 | 342 | if ((root->osc_control_set & ctrl) == ctrl) |
63f10f0f KK |
343 | goto out; |
344 | ||
75fb60f2 RW |
345 | /* Need to check the available controls bits before requesting them. */ |
346 | while (*mask) { | |
347 | status = acpi_pci_query_osc(root, root->osc_support_set, mask); | |
348 | if (ACPI_FAILURE(status)) | |
349 | goto out; | |
350 | if (ctrl == *mask) | |
351 | break; | |
352 | ctrl = *mask; | |
353 | } | |
2b8fd918 | 354 | |
75fb60f2 | 355 | if ((ctrl & req) != req) { |
63f10f0f KK |
356 | status = AE_SUPPORT; |
357 | goto out; | |
358 | } | |
359 | ||
360 | capbuf[OSC_QUERY_TYPE] = 0; | |
361 | capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set; | |
75fb60f2 RW |
362 | capbuf[OSC_CONTROL_TYPE] = ctrl; |
363 | status = acpi_pci_run_osc(handle, capbuf, mask); | |
63f10f0f | 364 | if (ACPI_SUCCESS(status)) |
75fb60f2 | 365 | root->osc_control_set = *mask; |
63f10f0f KK |
366 | out: |
367 | mutex_unlock(&osc_lock); | |
368 | return status; | |
369 | } | |
9f5404d8 | 370 | EXPORT_SYMBOL(acpi_pci_osc_control_set); |
63f10f0f | 371 | |
00c43b96 RW |
372 | static int acpi_pci_root_add(struct acpi_device *device, |
373 | const struct acpi_device_id *not_used) | |
1da177e4 | 374 | { |
f5eebbe1 BH |
375 | unsigned long long segment, bus; |
376 | acpi_status status; | |
377 | int result; | |
378 | struct acpi_pci_root *root; | |
0ef5f8f6 | 379 | u32 flags, base_flags; |
bfe2414a | 380 | acpi_handle handle = device->handle; |
3dc48af3 | 381 | bool no_aspm = false, clear_aspm = false; |
1da177e4 | 382 | |
6ad95513 BH |
383 | root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); |
384 | if (!root) | |
385 | return -ENOMEM; | |
386 | ||
f5eebbe1 | 387 | segment = 0; |
bfe2414a | 388 | status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, |
f5eebbe1 BH |
389 | &segment); |
390 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
6dc7d22c | 391 | dev_err(&device->dev, "can't evaluate _SEG\n"); |
6ad95513 BH |
392 | result = -ENODEV; |
393 | goto end; | |
f5eebbe1 | 394 | } |
1da177e4 | 395 | |
f5eebbe1 | 396 | /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ |
6ad95513 | 397 | root->secondary.flags = IORESOURCE_BUS; |
bfe2414a | 398 | status = try_get_root_bridge_busnr(handle, &root->secondary); |
f5eebbe1 | 399 | if (ACPI_FAILURE(status)) { |
6ad95513 BH |
400 | /* |
401 | * We need both the start and end of the downstream bus range | |
402 | * to interpret _CBA (MMCONFIG base address), so it really is | |
403 | * supposed to be in _CRS. If we don't find it there, all we | |
404 | * can do is assume [_BBN-0xFF] or [0-0xFF]. | |
405 | */ | |
406 | root->secondary.end = 0xFF; | |
6dc7d22c JL |
407 | dev_warn(&device->dev, |
408 | FW_BUG "no secondary bus range in _CRS\n"); | |
bfe2414a | 409 | status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, |
e545b55a | 410 | NULL, &bus); |
6ad95513 BH |
411 | if (ACPI_SUCCESS(status)) |
412 | root->secondary.start = bus; | |
413 | else if (status == AE_NOT_FOUND) | |
414 | root->secondary.start = 0; | |
415 | else { | |
6dc7d22c | 416 | dev_err(&device->dev, "can't evaluate _BBN\n"); |
6ad95513 BH |
417 | result = -ENODEV; |
418 | goto end; | |
f5eebbe1 BH |
419 | } |
420 | } | |
1da177e4 | 421 | |
32917e5b | 422 | root->device = device; |
0705495d | 423 | root->segment = segment & 0xFFFF; |
1da177e4 LT |
424 | strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); |
425 | strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); | |
db89b4f0 | 426 | device->driver_data = root; |
1da177e4 | 427 | |
6dc7d22c | 428 | pr_info(PREFIX "%s [%s] (domain %04x %pR)\n", |
4be44fcd | 429 | acpi_device_name(device), acpi_device_bid(device), |
6ad95513 | 430 | root->segment, &root->secondary); |
1da177e4 | 431 | |
bfe2414a | 432 | root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); |
1da177e4 | 433 | |
2786f6e3 | 434 | /* |
990a7ac5 AP |
435 | * All supported architectures that use ACPI have support for |
436 | * PCI domains, so we indicate this in _OSC support capabilities. | |
2786f6e3 | 437 | */ |
0ef5f8f6 | 438 | flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT; |
63f10f0f | 439 | acpi_pci_osc_support(root, flags); |
2786f6e3 | 440 | |
8c33f51d | 441 | if (pci_ext_cfg_avail()) |
0ef5f8f6 | 442 | flags |= OSC_EXT_PCI_CONFIG_SUPPORT; |
8c33f51d | 443 | if (pcie_aspm_support_enabled()) { |
3e1b1600 | 444 | flags |= OSC_ACTIVE_STATE_PWR_SUPPORT | |
8c33f51d TI |
445 | OSC_CLOCK_PWR_CAPABILITY_SUPPORT; |
446 | } | |
07ae95f9 AP |
447 | if (pci_msi_enabled()) |
448 | flags |= OSC_MSI_SUPPORT; | |
2d9c8677 RW |
449 | if (flags != base_flags) { |
450 | status = acpi_pci_osc_support(root, flags); | |
451 | if (ACPI_FAILURE(status)) { | |
8c33f51d | 452 | dev_info(&device->dev, "ACPI _OSC support " |
2d9c8677 | 453 | "notification failed, disabling PCIe ASPM\n"); |
3dc48af3 | 454 | no_aspm = true; |
2d9c8677 RW |
455 | flags = base_flags; |
456 | } | |
457 | } | |
b8178f13 | 458 | |
415e12b2 RW |
459 | if (!pcie_ports_disabled |
460 | && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) { | |
461 | flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL | |
462 | | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL | |
463 | | OSC_PCI_EXPRESS_PME_CONTROL; | |
464 | ||
465 | if (pci_aer_available()) { | |
466 | if (aer_acpi_firmware_first()) | |
8c33f51d | 467 | dev_dbg(&device->dev, |
415e12b2 RW |
468 | "PCIe errors handled by BIOS.\n"); |
469 | else | |
470 | flags |= OSC_PCI_EXPRESS_AER_CONTROL; | |
471 | } | |
472 | ||
8c33f51d | 473 | dev_info(&device->dev, |
415e12b2 RW |
474 | "Requesting ACPI _OSC control (0x%02x)\n", flags); |
475 | ||
bfe2414a | 476 | status = acpi_pci_osc_control_set(handle, &flags, |
8c33f51d | 477 | OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); |
eca67315 | 478 | if (ACPI_SUCCESS(status)) { |
8c33f51d | 479 | dev_info(&device->dev, |
415e12b2 | 480 | "ACPI _OSC control (0x%02x) granted\n", flags); |
b8178f13 BH |
481 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
482 | /* | |
483 | * We have ASPM control, but the FADT indicates | |
484 | * that it's unsupported. Clear it. | |
485 | */ | |
3dc48af3 | 486 | clear_aspm = true; |
b8178f13 | 487 | } |
eca67315 | 488 | } else { |
8c33f51d | 489 | dev_info(&device->dev, |
a246670d RW |
490 | "ACPI _OSC request failed (%s), " |
491 | "returned control mask: 0x%02x\n", | |
492 | acpi_format_exception(status), flags); | |
6dc7d22c JL |
493 | dev_info(&device->dev, |
494 | "ACPI _OSC control for PCIe not granted, disabling ASPM\n"); | |
3dc48af3 NH |
495 | /* |
496 | * We want to disable ASPM here, but aspm_disabled | |
497 | * needs to remain in its state from boot so that we | |
498 | * properly handle PCIe 1.1 devices. So we set this | |
499 | * flag here, to defer the action until after the ACPI | |
500 | * root scan. | |
501 | */ | |
502 | no_aspm = true; | |
eca67315 | 503 | } |
a246670d | 504 | } else { |
8c33f51d | 505 | dev_info(&device->dev, |
b8178f13 BH |
506 | "Unable to request _OSC control " |
507 | "(_OSC support mask: 0x%02x)\n", flags); | |
415e12b2 RW |
508 | } |
509 | ||
3dc48af3 NH |
510 | /* |
511 | * TBD: Need PCI interface for enumeration/configuration of roots. | |
512 | */ | |
513 | ||
514 | /* | |
515 | * Scan the Root Bridge | |
516 | * -------------------- | |
517 | * Must do this prior to any attempt to bind the root device, as the | |
518 | * PCI namespace does not get created until this call is made (and | |
519 | * thus the root bridge's pci_dev does not exist). | |
520 | */ | |
521 | root->bus = pci_acpi_scan_root(root); | |
522 | if (!root->bus) { | |
523 | dev_err(&device->dev, | |
524 | "Bus %04x:%02x not present in PCI namespace\n", | |
525 | root->segment, (unsigned int)root->secondary.start); | |
526 | result = -ENODEV; | |
527 | goto end; | |
528 | } | |
529 | ||
530 | if (clear_aspm) { | |
531 | dev_info(&device->dev, "Disabling ASPM (FADT indicates it is unsupported)\n"); | |
532 | pcie_clear_aspm(root->bus); | |
533 | } | |
534 | if (no_aspm) | |
535 | pcie_no_aspm(); | |
536 | ||
b67ea761 RW |
537 | pci_acpi_add_bus_pm_notifier(device, root->bus); |
538 | if (device->wakeup.flags.run_wake) | |
539 | device_set_run_wake(root->bus->bridge, true); | |
540 | ||
3c449ed0 YL |
541 | if (system_state != SYSTEM_BOOTING) { |
542 | pcibios_resource_survey_bus(root->bus); | |
39772038 | 543 | pci_assign_unassigned_root_bus_resources(root->bus); |
516ca223 | 544 | } |
62a08c5a | 545 | |
caf420c6 | 546 | pci_bus_add_devices(root->bus); |
00c43b96 | 547 | return 1; |
47525cda | 548 | |
47525cda RW |
549 | end: |
550 | kfree(root); | |
551 | return result; | |
c431ada4 | 552 | } |
1da177e4 | 553 | |
00c43b96 | 554 | static void acpi_pci_root_remove(struct acpi_device *device) |
1da177e4 | 555 | { |
caf420c6 | 556 | struct acpi_pci_root *root = acpi_driver_data(device); |
c8e9afb1 | 557 | |
9738a1fd YL |
558 | pci_stop_root_bus(root->bus); |
559 | ||
b67ea761 RW |
560 | device_set_run_wake(root->bus->bridge, false); |
561 | pci_acpi_remove_bus_pm_notifier(device); | |
562 | ||
9738a1fd YL |
563 | pci_remove_root_bus(root->bus); |
564 | ||
1da177e4 | 565 | kfree(root); |
1da177e4 LT |
566 | } |
567 | ||
00c43b96 | 568 | void __init acpi_pci_root_init(void) |
1da177e4 | 569 | { |
d3072e6a RW |
570 | acpi_hest_init(); |
571 | ||
00c43b96 RW |
572 | if (!acpi_pci_disabled) { |
573 | pci_acpi_crs_quirks(); | |
574 | acpi_scan_add_handler(&pci_root_handler); | |
575 | } | |
1da177e4 | 576 | } |
668192b6 YL |
577 | /* Support root bridge hotplug */ |
578 | ||
579 | static void handle_root_bridge_insertion(acpi_handle handle) | |
580 | { | |
581 | struct acpi_device *device; | |
582 | ||
583 | if (!acpi_bus_get_device(handle, &device)) { | |
6dc7d22c JL |
584 | dev_printk(KERN_DEBUG, &device->dev, |
585 | "acpi device already exists; ignoring notify\n"); | |
668192b6 YL |
586 | return; |
587 | } | |
588 | ||
589 | if (acpi_bus_scan(handle)) | |
6dc7d22c | 590 | acpi_handle_err(handle, "cannot add bridge to acpi list\n"); |
668192b6 YL |
591 | } |
592 | ||
593 | static void handle_root_bridge_removal(struct acpi_device *device) | |
594 | { | |
b8b66110 | 595 | acpi_status status; |
668192b6 YL |
596 | struct acpi_eject_event *ej_event; |
597 | ||
598 | ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL); | |
599 | if (!ej_event) { | |
600 | /* Inform firmware the hot-remove operation has error */ | |
601 | (void) acpi_evaluate_hotplug_ost(device->handle, | |
602 | ACPI_NOTIFY_EJECT_REQUEST, | |
603 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, | |
604 | NULL); | |
605 | return; | |
606 | } | |
607 | ||
608 | ej_event->device = device; | |
609 | ej_event->event = ACPI_NOTIFY_EJECT_REQUEST; | |
610 | ||
b8b66110 YL |
611 | status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event); |
612 | if (ACPI_FAILURE(status)) | |
613 | kfree(ej_event); | |
668192b6 YL |
614 | } |
615 | ||
616 | static void _handle_hotplug_event_root(struct work_struct *work) | |
617 | { | |
618 | struct acpi_pci_root *root; | |
668192b6 YL |
619 | struct acpi_hp_work *hp_work; |
620 | acpi_handle handle; | |
621 | u32 type; | |
622 | ||
623 | hp_work = container_of(work, struct acpi_hp_work, work); | |
624 | handle = hp_work->handle; | |
625 | type = hp_work->type; | |
626 | ||
b8b66110 | 627 | acpi_scan_lock_acquire(); |
668192b6 | 628 | |
b8b66110 | 629 | root = acpi_pci_find_root(handle); |
668192b6 YL |
630 | |
631 | switch (type) { | |
632 | case ACPI_NOTIFY_BUS_CHECK: | |
633 | /* bus enumerate */ | |
6dc7d22c JL |
634 | acpi_handle_printk(KERN_DEBUG, handle, |
635 | "Bus check notify on %s\n", __func__); | |
3f327e39 YL |
636 | if (root) |
637 | acpiphp_check_host_bridge(handle); | |
638 | else | |
668192b6 YL |
639 | handle_root_bridge_insertion(handle); |
640 | ||
641 | break; | |
642 | ||
643 | case ACPI_NOTIFY_DEVICE_CHECK: | |
644 | /* device check */ | |
6dc7d22c JL |
645 | acpi_handle_printk(KERN_DEBUG, handle, |
646 | "Device check notify on %s\n", __func__); | |
668192b6 YL |
647 | if (!root) |
648 | handle_root_bridge_insertion(handle); | |
649 | break; | |
650 | ||
651 | case ACPI_NOTIFY_EJECT_REQUEST: | |
652 | /* request device eject */ | |
6dc7d22c JL |
653 | acpi_handle_printk(KERN_DEBUG, handle, |
654 | "Device eject notify on %s\n", __func__); | |
668192b6 YL |
655 | if (root) |
656 | handle_root_bridge_removal(root->device); | |
657 | break; | |
658 | default: | |
6dc7d22c JL |
659 | acpi_handle_warn(handle, |
660 | "notify_handler: unknown event type 0x%x\n", | |
661 | type); | |
668192b6 YL |
662 | break; |
663 | } | |
664 | ||
b8b66110 | 665 | acpi_scan_lock_release(); |
668192b6 | 666 | kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ |
668192b6 YL |
667 | } |
668 | ||
669 | static void handle_hotplug_event_root(acpi_handle handle, u32 type, | |
670 | void *context) | |
671 | { | |
672 | alloc_acpi_hp_work(handle, type, context, | |
673 | _handle_hotplug_event_root); | |
674 | } | |
675 | ||
676 | static acpi_status __init | |
677 | find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) | |
678 | { | |
121b090e | 679 | acpi_status status; |
668192b6 YL |
680 | int *count = (int *)context; |
681 | ||
682 | if (!acpi_is_root_bridge(handle)) | |
683 | return AE_OK; | |
684 | ||
685 | (*count)++; | |
686 | ||
121b090e TC |
687 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
688 | handle_hotplug_event_root, NULL); | |
689 | if (ACPI_FAILURE(status)) | |
6dc7d22c JL |
690 | acpi_handle_printk(KERN_DEBUG, handle, |
691 | "notify handler is not installed, exit status: %u\n", | |
692 | (unsigned int)status); | |
121b090e | 693 | else |
6dc7d22c JL |
694 | acpi_handle_printk(KERN_DEBUG, handle, |
695 | "notify handler is installed\n"); | |
668192b6 YL |
696 | |
697 | return AE_OK; | |
698 | } | |
699 | ||
700 | void __init acpi_pci_root_hp_init(void) | |
701 | { | |
702 | int num = 0; | |
703 | ||
704 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
705 | ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL); | |
706 | ||
707 | printk(KERN_DEBUG "Found %d acpi root devices\n", num); | |
708 | } |