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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, | |
1ba95636 TK |
66 | .hotplug = { |
67 | .ignore = true, | |
68 | }, | |
1da177e4 LT |
69 | }; |
70 | ||
c309dbb4 | 71 | /* Lock to protect both acpi_pci_roots lists */ |
d0020f65 | 72 | static DEFINE_MUTEX(acpi_pci_root_lock); |
1da177e4 LT |
73 | static LIST_HEAD(acpi_pci_roots); |
74 | ||
63f10f0f | 75 | static DEFINE_MUTEX(osc_lock); |
1da177e4 | 76 | |
27558203 AC |
77 | /** |
78 | * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge | |
79 | * @handle - the ACPI CA node in question. | |
80 | * | |
81 | * Note: we could make this API take a struct acpi_device * instead, but | |
82 | * for now, it's more convenient to operate on an acpi_handle. | |
83 | */ | |
84 | int acpi_is_root_bridge(acpi_handle handle) | |
85 | { | |
86 | int ret; | |
87 | struct acpi_device *device; | |
88 | ||
89 | ret = acpi_bus_get_device(handle, &device); | |
90 | if (ret) | |
91 | return 0; | |
92 | ||
93 | ret = acpi_match_device_ids(device, root_device_ids); | |
94 | if (ret) | |
95 | return 0; | |
96 | else | |
97 | return 1; | |
98 | } | |
99 | EXPORT_SYMBOL_GPL(acpi_is_root_bridge); | |
100 | ||
1da177e4 | 101 | static acpi_status |
4be44fcd | 102 | get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) |
1da177e4 | 103 | { |
6ad95513 | 104 | struct resource *res = data; |
1da177e4 LT |
105 | struct acpi_resource_address64 address; |
106 | ||
50eca3eb BM |
107 | if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && |
108 | resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 && | |
109 | resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) | |
1da177e4 LT |
110 | return AE_OK; |
111 | ||
112 | acpi_resource_to_address64(resource, &address); | |
4be44fcd | 113 | if ((address.address_length > 0) && |
6ad95513 BH |
114 | (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { |
115 | res->start = address.minimum; | |
116 | res->end = address.minimum + address.address_length - 1; | |
117 | } | |
1da177e4 LT |
118 | |
119 | return AE_OK; | |
120 | } | |
121 | ||
f5eebbe1 | 122 | static acpi_status try_get_root_bridge_busnr(acpi_handle handle, |
6ad95513 | 123 | struct resource *res) |
1da177e4 LT |
124 | { |
125 | acpi_status status; | |
126 | ||
6ad95513 | 127 | res->start = -1; |
4be44fcd LB |
128 | status = |
129 | acpi_walk_resources(handle, METHOD_NAME__CRS, | |
6ad95513 | 130 | get_root_bridge_busnr_callback, res); |
1da177e4 LT |
131 | if (ACPI_FAILURE(status)) |
132 | return status; | |
6ad95513 | 133 | if (res->start == -1) |
1da177e4 LT |
134 | return AE_ERROR; |
135 | return AE_OK; | |
136 | } | |
137 | ||
3a9622dc | 138 | static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; |
63f10f0f KK |
139 | |
140 | static acpi_status acpi_pci_run_osc(acpi_handle handle, | |
141 | const u32 *capbuf, u32 *retval) | |
142 | { | |
3a9622dc SL |
143 | struct acpi_osc_context context = { |
144 | .uuid_str = pci_osc_uuid_str, | |
145 | .rev = 1, | |
146 | .cap.length = 12, | |
147 | .cap.pointer = (void *)capbuf, | |
148 | }; | |
63f10f0f | 149 | acpi_status status; |
63f10f0f | 150 | |
3a9622dc SL |
151 | status = acpi_run_osc(handle, &context); |
152 | if (ACPI_SUCCESS(status)) { | |
153 | *retval = *((u32 *)(context.ret.pointer + 8)); | |
154 | kfree(context.ret.pointer); | |
63f10f0f | 155 | } |
63f10f0f KK |
156 | return status; |
157 | } | |
158 | ||
ab8e8957 RW |
159 | static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, |
160 | u32 support, | |
161 | u32 *control) | |
63f10f0f KK |
162 | { |
163 | acpi_status status; | |
ab8e8957 RW |
164 | u32 result, capbuf[3]; |
165 | ||
166 | support &= OSC_PCI_SUPPORT_MASKS; | |
167 | support |= root->osc_support_set; | |
63f10f0f | 168 | |
63f10f0f | 169 | capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; |
ab8e8957 RW |
170 | capbuf[OSC_SUPPORT_TYPE] = support; |
171 | if (control) { | |
172 | *control &= OSC_PCI_CONTROL_MASKS; | |
173 | capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set; | |
174 | } else { | |
545d6e18 YL |
175 | /* Run _OSC query only with existing controls. */ |
176 | capbuf[OSC_CONTROL_TYPE] = root->osc_control_set; | |
ab8e8957 | 177 | } |
63f10f0f KK |
178 | |
179 | status = acpi_pci_run_osc(root->device->handle, capbuf, &result); | |
180 | if (ACPI_SUCCESS(status)) { | |
ab8e8957 | 181 | root->osc_support_set = support; |
2b8fd918 | 182 | if (control) |
ab8e8957 | 183 | *control = result; |
63f10f0f KK |
184 | } |
185 | return status; | |
186 | } | |
187 | ||
188 | static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) | |
189 | { | |
190 | acpi_status status; | |
191 | acpi_handle tmp; | |
192 | ||
193 | status = acpi_get_handle(root->device->handle, "_OSC", &tmp); | |
194 | if (ACPI_FAILURE(status)) | |
195 | return status; | |
196 | mutex_lock(&osc_lock); | |
ab8e8957 | 197 | status = acpi_pci_query_osc(root, flags, NULL); |
63f10f0f KK |
198 | mutex_unlock(&osc_lock); |
199 | return status; | |
200 | } | |
201 | ||
76d56de5 | 202 | struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) |
63f10f0f KK |
203 | { |
204 | struct acpi_pci_root *root; | |
cd4faf9c | 205 | struct acpi_device *device; |
c1aec834 | 206 | |
cd4faf9c TI |
207 | if (acpi_bus_get_device(handle, &device) || |
208 | acpi_match_device_ids(device, root_device_ids)) | |
209 | return NULL; | |
210 | ||
211 | root = acpi_driver_data(device); | |
212 | ||
213 | return root; | |
63f10f0f | 214 | } |
76d56de5 | 215 | EXPORT_SYMBOL_GPL(acpi_pci_find_root); |
63f10f0f | 216 | |
2f7bbceb AC |
217 | struct acpi_handle_node { |
218 | struct list_head node; | |
219 | acpi_handle handle; | |
220 | }; | |
221 | ||
222 | /** | |
223 | * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev | |
224 | * @handle: the handle in question | |
225 | * | |
226 | * Given an ACPI CA handle, the desired PCI device is located in the | |
227 | * list of PCI devices. | |
228 | * | |
229 | * If the device is found, its reference count is increased and this | |
230 | * function returns a pointer to its data structure. The caller must | |
231 | * decrement the reference count by calling pci_dev_put(). | |
232 | * If no device is found, %NULL is returned. | |
233 | */ | |
234 | struct pci_dev *acpi_get_pci_dev(acpi_handle handle) | |
235 | { | |
236 | int dev, fn; | |
237 | unsigned long long adr; | |
238 | acpi_status status; | |
239 | acpi_handle phandle; | |
240 | struct pci_bus *pbus; | |
241 | struct pci_dev *pdev = NULL; | |
242 | struct acpi_handle_node *node, *tmp; | |
243 | struct acpi_pci_root *root; | |
244 | LIST_HEAD(device_list); | |
245 | ||
246 | /* | |
247 | * Walk up the ACPI CA namespace until we reach a PCI root bridge. | |
248 | */ | |
249 | phandle = handle; | |
250 | while (!acpi_is_root_bridge(phandle)) { | |
251 | node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); | |
252 | if (!node) | |
253 | goto out; | |
254 | ||
255 | INIT_LIST_HEAD(&node->node); | |
256 | node->handle = phandle; | |
257 | list_add(&node->node, &device_list); | |
258 | ||
259 | status = acpi_get_parent(phandle, &phandle); | |
260 | if (ACPI_FAILURE(status)) | |
261 | goto out; | |
262 | } | |
263 | ||
264 | root = acpi_pci_find_root(phandle); | |
265 | if (!root) | |
266 | goto out; | |
267 | ||
268 | pbus = root->bus; | |
269 | ||
270 | /* | |
271 | * Now, walk back down the PCI device tree until we return to our | |
272 | * original handle. Assumes that everything between the PCI root | |
273 | * bridge and the device we're looking for must be a P2P bridge. | |
274 | */ | |
275 | list_for_each_entry(node, &device_list, node) { | |
276 | acpi_handle hnd = node->handle; | |
277 | status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); | |
278 | if (ACPI_FAILURE(status)) | |
279 | goto out; | |
280 | dev = (adr >> 16) & 0xffff; | |
281 | fn = adr & 0xffff; | |
282 | ||
283 | pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); | |
412af978 | 284 | if (!pdev || hnd == handle) |
2f7bbceb AC |
285 | break; |
286 | ||
287 | pbus = pdev->subordinate; | |
288 | pci_dev_put(pdev); | |
497fb54f RW |
289 | |
290 | /* | |
291 | * This function may be called for a non-PCI device that has a | |
292 | * PCI parent (eg. a disk under a PCI SATA controller). In that | |
293 | * case pdev->subordinate will be NULL for the parent. | |
294 | */ | |
295 | if (!pbus) { | |
296 | dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); | |
297 | pdev = NULL; | |
298 | break; | |
299 | } | |
2f7bbceb AC |
300 | } |
301 | out: | |
302 | list_for_each_entry_safe(node, tmp, &device_list, node) | |
303 | kfree(node); | |
304 | ||
305 | return pdev; | |
306 | } | |
307 | EXPORT_SYMBOL_GPL(acpi_get_pci_dev); | |
308 | ||
63f10f0f | 309 | /** |
75fb60f2 RW |
310 | * acpi_pci_osc_control_set - Request control of PCI root _OSC features. |
311 | * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). | |
312 | * @mask: Mask of _OSC bits to request control of, place to store control mask. | |
313 | * @req: Mask of _OSC bits the control of is essential to the caller. | |
63f10f0f | 314 | * |
75fb60f2 RW |
315 | * Run _OSC query for @mask and if that is successful, compare the returned |
316 | * mask of control bits with @req. If all of the @req bits are set in the | |
317 | * returned mask, run _OSC request for it. | |
318 | * | |
319 | * The variable at the @mask address may be modified regardless of whether or | |
320 | * not the function returns success. On success it will contain the mask of | |
321 | * _OSC bits the BIOS has granted control of, but its contents are meaningless | |
322 | * on failure. | |
63f10f0f | 323 | **/ |
75fb60f2 | 324 | acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) |
63f10f0f | 325 | { |
75fb60f2 | 326 | struct acpi_pci_root *root; |
63f10f0f | 327 | acpi_status status; |
75fb60f2 | 328 | u32 ctrl, capbuf[3]; |
63f10f0f | 329 | acpi_handle tmp; |
63f10f0f | 330 | |
75fb60f2 RW |
331 | if (!mask) |
332 | return AE_BAD_PARAMETER; | |
333 | ||
334 | ctrl = *mask & OSC_PCI_CONTROL_MASKS; | |
335 | if ((ctrl & req) != req) | |
63f10f0f KK |
336 | return AE_TYPE; |
337 | ||
338 | root = acpi_pci_find_root(handle); | |
339 | if (!root) | |
340 | return AE_NOT_EXIST; | |
341 | ||
b879dc4b RW |
342 | status = acpi_get_handle(handle, "_OSC", &tmp); |
343 | if (ACPI_FAILURE(status)) | |
344 | return status; | |
345 | ||
63f10f0f | 346 | mutex_lock(&osc_lock); |
75fb60f2 RW |
347 | |
348 | *mask = ctrl | root->osc_control_set; | |
63f10f0f | 349 | /* No need to evaluate _OSC if the control was already granted. */ |
75fb60f2 | 350 | if ((root->osc_control_set & ctrl) == ctrl) |
63f10f0f KK |
351 | goto out; |
352 | ||
75fb60f2 RW |
353 | /* Need to check the available controls bits before requesting them. */ |
354 | while (*mask) { | |
355 | status = acpi_pci_query_osc(root, root->osc_support_set, mask); | |
356 | if (ACPI_FAILURE(status)) | |
357 | goto out; | |
358 | if (ctrl == *mask) | |
359 | break; | |
360 | ctrl = *mask; | |
361 | } | |
2b8fd918 | 362 | |
75fb60f2 | 363 | if ((ctrl & req) != req) { |
63f10f0f KK |
364 | status = AE_SUPPORT; |
365 | goto out; | |
366 | } | |
367 | ||
368 | capbuf[OSC_QUERY_TYPE] = 0; | |
369 | capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set; | |
75fb60f2 RW |
370 | capbuf[OSC_CONTROL_TYPE] = ctrl; |
371 | status = acpi_pci_run_osc(handle, capbuf, mask); | |
63f10f0f | 372 | if (ACPI_SUCCESS(status)) |
75fb60f2 | 373 | root->osc_control_set = *mask; |
63f10f0f KK |
374 | out: |
375 | mutex_unlock(&osc_lock); | |
376 | return status; | |
377 | } | |
9f5404d8 | 378 | EXPORT_SYMBOL(acpi_pci_osc_control_set); |
63f10f0f | 379 | |
00c43b96 RW |
380 | static int acpi_pci_root_add(struct acpi_device *device, |
381 | const struct acpi_device_id *not_used) | |
1da177e4 | 382 | { |
f5eebbe1 BH |
383 | unsigned long long segment, bus; |
384 | acpi_status status; | |
385 | int result; | |
386 | struct acpi_pci_root *root; | |
0ef5f8f6 | 387 | u32 flags, base_flags; |
1da177e4 | 388 | |
6ad95513 BH |
389 | root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); |
390 | if (!root) | |
391 | return -ENOMEM; | |
392 | ||
f5eebbe1 BH |
393 | segment = 0; |
394 | status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL, | |
395 | &segment); | |
396 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
397 | printk(KERN_ERR PREFIX "can't evaluate _SEG\n"); | |
6ad95513 BH |
398 | result = -ENODEV; |
399 | goto end; | |
f5eebbe1 | 400 | } |
1da177e4 | 401 | |
f5eebbe1 | 402 | /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ |
6ad95513 BH |
403 | root->secondary.flags = IORESOURCE_BUS; |
404 | status = try_get_root_bridge_busnr(device->handle, &root->secondary); | |
f5eebbe1 | 405 | if (ACPI_FAILURE(status)) { |
6ad95513 BH |
406 | /* |
407 | * We need both the start and end of the downstream bus range | |
408 | * to interpret _CBA (MMCONFIG base address), so it really is | |
409 | * supposed to be in _CRS. If we don't find it there, all we | |
410 | * can do is assume [_BBN-0xFF] or [0-0xFF]. | |
411 | */ | |
412 | root->secondary.end = 0xFF; | |
413 | printk(KERN_WARNING FW_BUG PREFIX | |
414 | "no secondary bus range in _CRS\n"); | |
e545b55a JM |
415 | status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, |
416 | NULL, &bus); | |
6ad95513 BH |
417 | if (ACPI_SUCCESS(status)) |
418 | root->secondary.start = bus; | |
419 | else if (status == AE_NOT_FOUND) | |
420 | root->secondary.start = 0; | |
421 | else { | |
422 | printk(KERN_ERR PREFIX "can't evaluate _BBN\n"); | |
423 | result = -ENODEV; | |
424 | goto end; | |
f5eebbe1 BH |
425 | } |
426 | } | |
1da177e4 | 427 | |
f5eebbe1 | 428 | INIT_LIST_HEAD(&root->node); |
32917e5b | 429 | root->device = device; |
0705495d | 430 | root->segment = segment & 0xFFFF; |
1da177e4 LT |
431 | strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); |
432 | strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); | |
db89b4f0 | 433 | device->driver_data = root; |
1da177e4 | 434 | |
6ad95513 | 435 | printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n", |
4be44fcd | 436 | acpi_device_name(device), acpi_device_bid(device), |
6ad95513 | 437 | root->segment, &root->secondary); |
1da177e4 | 438 | |
f4b57a3b | 439 | root->mcfg_addr = acpi_pci_root_get_mcfg_addr(device->handle); |
1da177e4 | 440 | |
2786f6e3 | 441 | /* |
990a7ac5 AP |
442 | * All supported architectures that use ACPI have support for |
443 | * PCI domains, so we indicate this in _OSC support capabilities. | |
2786f6e3 | 444 | */ |
0ef5f8f6 | 445 | flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT; |
63f10f0f | 446 | acpi_pci_osc_support(root, flags); |
2786f6e3 | 447 | |
b8178f13 BH |
448 | /* |
449 | * TBD: Need PCI interface for enumeration/configuration of roots. | |
450 | */ | |
451 | ||
452 | mutex_lock(&acpi_pci_root_lock); | |
453 | list_add_tail(&root->node, &acpi_pci_roots); | |
454 | mutex_unlock(&acpi_pci_root_lock); | |
455 | ||
456 | /* | |
457 | * Scan the Root Bridge | |
458 | * -------------------- | |
459 | * Must do this prior to any attempt to bind the root device, as the | |
460 | * PCI namespace does not get created until this call is made (and | |
461 | * thus the root bridge's pci_dev does not exist). | |
462 | */ | |
463 | root->bus = pci_acpi_scan_root(root); | |
464 | if (!root->bus) { | |
465 | printk(KERN_ERR PREFIX | |
466 | "Bus %04x:%02x not present in PCI namespace\n", | |
467 | root->segment, (unsigned int)root->secondary.start); | |
468 | result = -ENODEV; | |
469 | goto out_del_root; | |
470 | } | |
471 | ||
0ef5f8f6 | 472 | /* Indicate support for various _OSC capabilities. */ |
8c33f51d | 473 | if (pci_ext_cfg_avail()) |
0ef5f8f6 | 474 | flags |= OSC_EXT_PCI_CONFIG_SUPPORT; |
8c33f51d | 475 | if (pcie_aspm_support_enabled()) { |
3e1b1600 | 476 | flags |= OSC_ACTIVE_STATE_PWR_SUPPORT | |
8c33f51d TI |
477 | OSC_CLOCK_PWR_CAPABILITY_SUPPORT; |
478 | } | |
07ae95f9 AP |
479 | if (pci_msi_enabled()) |
480 | flags |= OSC_MSI_SUPPORT; | |
2d9c8677 RW |
481 | if (flags != base_flags) { |
482 | status = acpi_pci_osc_support(root, flags); | |
483 | if (ACPI_FAILURE(status)) { | |
8c33f51d | 484 | dev_info(&device->dev, "ACPI _OSC support " |
2d9c8677 RW |
485 | "notification failed, disabling PCIe ASPM\n"); |
486 | pcie_no_aspm(); | |
487 | flags = base_flags; | |
488 | } | |
489 | } | |
b8178f13 | 490 | |
415e12b2 RW |
491 | if (!pcie_ports_disabled |
492 | && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) { | |
493 | flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL | |
494 | | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL | |
495 | | OSC_PCI_EXPRESS_PME_CONTROL; | |
496 | ||
497 | if (pci_aer_available()) { | |
498 | if (aer_acpi_firmware_first()) | |
8c33f51d | 499 | dev_dbg(&device->dev, |
415e12b2 RW |
500 | "PCIe errors handled by BIOS.\n"); |
501 | else | |
502 | flags |= OSC_PCI_EXPRESS_AER_CONTROL; | |
503 | } | |
504 | ||
8c33f51d | 505 | dev_info(&device->dev, |
415e12b2 RW |
506 | "Requesting ACPI _OSC control (0x%02x)\n", flags); |
507 | ||
508 | status = acpi_pci_osc_control_set(device->handle, &flags, | |
8c33f51d | 509 | OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); |
eca67315 | 510 | if (ACPI_SUCCESS(status)) { |
8c33f51d | 511 | dev_info(&device->dev, |
415e12b2 | 512 | "ACPI _OSC control (0x%02x) granted\n", flags); |
b8178f13 BH |
513 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
514 | /* | |
515 | * We have ASPM control, but the FADT indicates | |
516 | * that it's unsupported. Clear it. | |
517 | */ | |
518 | pcie_clear_aspm(root->bus); | |
519 | } | |
eca67315 | 520 | } else { |
8c33f51d | 521 | dev_info(&device->dev, |
a246670d RW |
522 | "ACPI _OSC request failed (%s), " |
523 | "returned control mask: 0x%02x\n", | |
524 | acpi_format_exception(status), flags); | |
b8178f13 BH |
525 | pr_info("ACPI _OSC control for PCIe not granted, " |
526 | "disabling ASPM\n"); | |
527 | pcie_no_aspm(); | |
eca67315 | 528 | } |
a246670d | 529 | } else { |
8c33f51d | 530 | dev_info(&device->dev, |
b8178f13 BH |
531 | "Unable to request _OSC control " |
532 | "(_OSC support mask: 0x%02x)\n", flags); | |
415e12b2 RW |
533 | } |
534 | ||
b67ea761 RW |
535 | pci_acpi_add_bus_pm_notifier(device, root->bus); |
536 | if (device->wakeup.flags.run_wake) | |
537 | device_set_run_wake(root->bus->bridge, true); | |
538 | ||
3c449ed0 YL |
539 | if (system_state != SYSTEM_BOOTING) { |
540 | pcibios_resource_survey_bus(root->bus); | |
62a08c5a | 541 | pci_assign_unassigned_bus_resources(root->bus); |
3c449ed0 | 542 | } |
62a08c5a | 543 | |
62a08c5a YL |
544 | /* need to after hot-added ioapic is registered */ |
545 | if (system_state != SYSTEM_BOOTING) | |
546 | pci_enable_bridges(root->bus); | |
547 | ||
caf420c6 | 548 | pci_bus_add_devices(root->bus); |
00c43b96 | 549 | return 1; |
47525cda RW |
550 | |
551 | out_del_root: | |
552 | mutex_lock(&acpi_pci_root_lock); | |
553 | list_del(&root->node); | |
554 | mutex_unlock(&acpi_pci_root_lock); | |
555 | ||
47525cda RW |
556 | end: |
557 | kfree(root); | |
558 | return result; | |
c431ada4 | 559 | } |
1da177e4 | 560 | |
00c43b96 | 561 | static void acpi_pci_root_remove(struct acpi_device *device) |
1da177e4 | 562 | { |
caf420c6 | 563 | struct acpi_pci_root *root = acpi_driver_data(device); |
c8e9afb1 | 564 | |
9738a1fd YL |
565 | pci_stop_root_bus(root->bus); |
566 | ||
b67ea761 RW |
567 | device_set_run_wake(root->bus->bridge, false); |
568 | pci_acpi_remove_bus_pm_notifier(device); | |
569 | ||
9738a1fd YL |
570 | pci_remove_root_bus(root->bus); |
571 | ||
572 | mutex_lock(&acpi_pci_root_lock); | |
6507e6eb TI |
573 | list_del(&root->node); |
574 | mutex_unlock(&acpi_pci_root_lock); | |
1da177e4 | 575 | kfree(root); |
1da177e4 LT |
576 | } |
577 | ||
00c43b96 | 578 | void __init acpi_pci_root_init(void) |
1da177e4 | 579 | { |
d3072e6a RW |
580 | acpi_hest_init(); |
581 | ||
00c43b96 RW |
582 | if (!acpi_pci_disabled) { |
583 | pci_acpi_crs_quirks(); | |
584 | acpi_scan_add_handler(&pci_root_handler); | |
585 | } | |
1da177e4 | 586 | } |
668192b6 YL |
587 | /* Support root bridge hotplug */ |
588 | ||
589 | static void handle_root_bridge_insertion(acpi_handle handle) | |
590 | { | |
591 | struct acpi_device *device; | |
592 | ||
593 | if (!acpi_bus_get_device(handle, &device)) { | |
594 | printk(KERN_DEBUG "acpi device exists...\n"); | |
595 | return; | |
596 | } | |
597 | ||
598 | if (acpi_bus_scan(handle)) | |
599 | printk(KERN_ERR "cannot add bridge to acpi list\n"); | |
600 | } | |
601 | ||
602 | static void handle_root_bridge_removal(struct acpi_device *device) | |
603 | { | |
b8b66110 | 604 | acpi_status status; |
668192b6 YL |
605 | struct acpi_eject_event *ej_event; |
606 | ||
607 | ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL); | |
608 | if (!ej_event) { | |
609 | /* Inform firmware the hot-remove operation has error */ | |
610 | (void) acpi_evaluate_hotplug_ost(device->handle, | |
611 | ACPI_NOTIFY_EJECT_REQUEST, | |
612 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, | |
613 | NULL); | |
614 | return; | |
615 | } | |
616 | ||
617 | ej_event->device = device; | |
618 | ej_event->event = ACPI_NOTIFY_EJECT_REQUEST; | |
619 | ||
e02d0a04 | 620 | get_device(&device->dev); |
b8b66110 | 621 | status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event); |
e02d0a04 RW |
622 | if (ACPI_FAILURE(status)) { |
623 | put_device(&device->dev); | |
b8b66110 | 624 | kfree(ej_event); |
e02d0a04 | 625 | } |
668192b6 YL |
626 | } |
627 | ||
628 | static void _handle_hotplug_event_root(struct work_struct *work) | |
629 | { | |
630 | struct acpi_pci_root *root; | |
631 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER }; | |
632 | struct acpi_hp_work *hp_work; | |
633 | acpi_handle handle; | |
634 | u32 type; | |
635 | ||
636 | hp_work = container_of(work, struct acpi_hp_work, work); | |
637 | handle = hp_work->handle; | |
638 | type = hp_work->type; | |
639 | ||
b8b66110 | 640 | acpi_scan_lock_acquire(); |
668192b6 | 641 | |
b8b66110 | 642 | root = acpi_pci_find_root(handle); |
668192b6 YL |
643 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
644 | ||
645 | switch (type) { | |
646 | case ACPI_NOTIFY_BUS_CHECK: | |
647 | /* bus enumerate */ | |
648 | printk(KERN_DEBUG "%s: Bus check notify on %s\n", __func__, | |
649 | (char *)buffer.pointer); | |
3f327e39 YL |
650 | if (root) |
651 | acpiphp_check_host_bridge(handle); | |
652 | else | |
668192b6 YL |
653 | handle_root_bridge_insertion(handle); |
654 | ||
655 | break; | |
656 | ||
657 | case ACPI_NOTIFY_DEVICE_CHECK: | |
658 | /* device check */ | |
659 | printk(KERN_DEBUG "%s: Device check notify on %s\n", __func__, | |
660 | (char *)buffer.pointer); | |
661 | if (!root) | |
662 | handle_root_bridge_insertion(handle); | |
663 | break; | |
664 | ||
665 | case ACPI_NOTIFY_EJECT_REQUEST: | |
666 | /* request device eject */ | |
667 | printk(KERN_DEBUG "%s: Device eject notify on %s\n", __func__, | |
668 | (char *)buffer.pointer); | |
669 | if (root) | |
670 | handle_root_bridge_removal(root->device); | |
671 | break; | |
672 | default: | |
673 | printk(KERN_WARNING "notify_handler: unknown event type 0x%x for %s\n", | |
674 | type, (char *)buffer.pointer); | |
675 | break; | |
676 | } | |
677 | ||
b8b66110 | 678 | acpi_scan_lock_release(); |
668192b6 YL |
679 | kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ |
680 | kfree(buffer.pointer); | |
681 | } | |
682 | ||
683 | static void handle_hotplug_event_root(acpi_handle handle, u32 type, | |
684 | void *context) | |
685 | { | |
686 | alloc_acpi_hp_work(handle, type, context, | |
687 | _handle_hotplug_event_root); | |
688 | } | |
689 | ||
690 | static acpi_status __init | |
691 | find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) | |
692 | { | |
121b090e | 693 | acpi_status status; |
668192b6 YL |
694 | char objname[64]; |
695 | struct acpi_buffer buffer = { .length = sizeof(objname), | |
696 | .pointer = objname }; | |
697 | int *count = (int *)context; | |
698 | ||
699 | if (!acpi_is_root_bridge(handle)) | |
700 | return AE_OK; | |
701 | ||
702 | (*count)++; | |
703 | ||
704 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
705 | ||
121b090e TC |
706 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
707 | handle_hotplug_event_root, NULL); | |
708 | if (ACPI_FAILURE(status)) | |
709 | printk(KERN_DEBUG "acpi root: %s notify handler is not installed, exit status: %u\n", | |
710 | objname, (unsigned int)status); | |
711 | else | |
712 | printk(KERN_DEBUG "acpi root: %s notify handler is installed\n", | |
713 | objname); | |
668192b6 YL |
714 | |
715 | return AE_OK; | |
716 | } | |
717 | ||
718 | void __init acpi_pci_root_hp_init(void) | |
719 | { | |
720 | int num = 0; | |
721 | ||
722 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
723 | ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL); | |
724 | ||
725 | printk(KERN_DEBUG "Found %d acpi root devices\n", num); | |
726 | } |