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