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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> |
8b48463f | 38 | #include <acpi/apei.h> /* for acpi_hest_init() */ |
1da177e4 | 39 | |
ace8238b RW |
40 | #include "internal.h" |
41 | ||
1da177e4 | 42 | #define _COMPONENT ACPI_PCI_COMPONENT |
f52fd66d | 43 | ACPI_MODULE_NAME("pci_root"); |
1da177e4 | 44 | #define ACPI_PCI_ROOT_CLASS "pci_bridge" |
1da177e4 | 45 | #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" |
00c43b96 RW |
46 | static int acpi_pci_root_add(struct acpi_device *device, |
47 | const struct acpi_device_id *not_used); | |
48 | static void acpi_pci_root_remove(struct acpi_device *device); | |
1da177e4 | 49 | |
3338db00 RW |
50 | static int acpi_pci_root_scan_dependent(struct acpi_device *adev) |
51 | { | |
1f7c164b | 52 | acpiphp_check_host_bridge(adev); |
3338db00 RW |
53 | return 0; |
54 | } | |
55 | ||
7dab9ef4 BH |
56 | #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ |
57 | | OSC_PCI_ASPM_SUPPORT \ | |
58 | | OSC_PCI_CLOCK_PM_SUPPORT \ | |
59 | | OSC_PCI_MSI_SUPPORT) | |
415e12b2 | 60 | |
c97adf9e | 61 | static const struct acpi_device_id root_device_ids[] = { |
1ba90e3a TR |
62 | {"PNP0A03", 0}, |
63 | {"", 0}, | |
64 | }; | |
1ba90e3a | 65 | |
00c43b96 | 66 | static struct acpi_scan_handler pci_root_handler = { |
1ba90e3a | 67 | .ids = root_device_ids, |
00c43b96 RW |
68 | .attach = acpi_pci_root_add, |
69 | .detach = acpi_pci_root_remove, | |
ca499fc8 | 70 | .hotplug = { |
3338db00 RW |
71 | .enabled = true, |
72 | .scan_dependent = acpi_pci_root_scan_dependent, | |
ca499fc8 | 73 | }, |
1da177e4 LT |
74 | }; |
75 | ||
63f10f0f | 76 | static DEFINE_MUTEX(osc_lock); |
1da177e4 | 77 | |
27558203 AC |
78 | /** |
79 | * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge | |
80 | * @handle - the ACPI CA node in question. | |
81 | * | |
82 | * Note: we could make this API take a struct acpi_device * instead, but | |
83 | * for now, it's more convenient to operate on an acpi_handle. | |
84 | */ | |
85 | int acpi_is_root_bridge(acpi_handle handle) | |
86 | { | |
87 | int ret; | |
88 | struct acpi_device *device; | |
89 | ||
90 | ret = acpi_bus_get_device(handle, &device); | |
91 | if (ret) | |
92 | return 0; | |
93 | ||
94 | ret = acpi_match_device_ids(device, root_device_ids); | |
95 | if (ret) | |
96 | return 0; | |
97 | else | |
98 | return 1; | |
99 | } | |
100 | EXPORT_SYMBOL_GPL(acpi_is_root_bridge); | |
101 | ||
1da177e4 | 102 | static acpi_status |
4be44fcd | 103 | get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) |
1da177e4 | 104 | { |
6ad95513 | 105 | struct resource *res = data; |
1da177e4 | 106 | struct acpi_resource_address64 address; |
f6c1c8ff | 107 | acpi_status status; |
1da177e4 | 108 | |
f6c1c8ff BH |
109 | status = acpi_resource_to_address64(resource, &address); |
110 | if (ACPI_FAILURE(status)) | |
1da177e4 LT |
111 | return AE_OK; |
112 | ||
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 | ||
955f14b4 BH |
138 | struct pci_osc_bit_struct { |
139 | u32 bit; | |
140 | char *desc; | |
141 | }; | |
142 | ||
143 | static struct pci_osc_bit_struct pci_osc_support_bit[] = { | |
144 | { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, | |
145 | { OSC_PCI_ASPM_SUPPORT, "ASPM" }, | |
146 | { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, | |
147 | { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, | |
148 | { OSC_PCI_MSI_SUPPORT, "MSI" }, | |
149 | }; | |
150 | ||
151 | static struct pci_osc_bit_struct pci_osc_control_bit[] = { | |
152 | { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" }, | |
153 | { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" }, | |
154 | { OSC_PCI_EXPRESS_PME_CONTROL, "PME" }, | |
155 | { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, | |
156 | { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, | |
157 | }; | |
158 | ||
159 | static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, | |
160 | struct pci_osc_bit_struct *table, int size) | |
161 | { | |
162 | char buf[80]; | |
163 | int i, len = 0; | |
164 | struct pci_osc_bit_struct *entry; | |
165 | ||
166 | buf[0] = '\0'; | |
167 | for (i = 0, entry = table; i < size; i++, entry++) | |
168 | if (word & entry->bit) | |
169 | len += snprintf(buf + len, sizeof(buf) - len, "%s%s", | |
170 | len ? " " : "", entry->desc); | |
171 | ||
172 | dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); | |
173 | } | |
174 | ||
175 | static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) | |
176 | { | |
177 | decode_osc_bits(root, msg, word, pci_osc_support_bit, | |
178 | ARRAY_SIZE(pci_osc_support_bit)); | |
179 | } | |
180 | ||
181 | static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) | |
182 | { | |
183 | decode_osc_bits(root, msg, word, pci_osc_control_bit, | |
184 | ARRAY_SIZE(pci_osc_control_bit)); | |
185 | } | |
186 | ||
3a9622dc | 187 | static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; |
63f10f0f KK |
188 | |
189 | static acpi_status acpi_pci_run_osc(acpi_handle handle, | |
190 | const u32 *capbuf, u32 *retval) | |
191 | { | |
3a9622dc SL |
192 | struct acpi_osc_context context = { |
193 | .uuid_str = pci_osc_uuid_str, | |
194 | .rev = 1, | |
195 | .cap.length = 12, | |
196 | .cap.pointer = (void *)capbuf, | |
197 | }; | |
63f10f0f | 198 | acpi_status status; |
63f10f0f | 199 | |
3a9622dc SL |
200 | status = acpi_run_osc(handle, &context); |
201 | if (ACPI_SUCCESS(status)) { | |
202 | *retval = *((u32 *)(context.ret.pointer + 8)); | |
203 | kfree(context.ret.pointer); | |
63f10f0f | 204 | } |
63f10f0f KK |
205 | return status; |
206 | } | |
207 | ||
ab8e8957 RW |
208 | static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, |
209 | u32 support, | |
210 | u32 *control) | |
63f10f0f KK |
211 | { |
212 | acpi_status status; | |
ab8e8957 RW |
213 | u32 result, capbuf[3]; |
214 | ||
215 | support &= OSC_PCI_SUPPORT_MASKS; | |
216 | support |= root->osc_support_set; | |
63f10f0f | 217 | |
b938a229 BH |
218 | capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; |
219 | capbuf[OSC_SUPPORT_DWORD] = support; | |
ab8e8957 RW |
220 | if (control) { |
221 | *control &= OSC_PCI_CONTROL_MASKS; | |
b938a229 | 222 | capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; |
ab8e8957 | 223 | } else { |
545d6e18 | 224 | /* Run _OSC query only with existing controls. */ |
b938a229 | 225 | capbuf[OSC_CONTROL_DWORD] = root->osc_control_set; |
ab8e8957 | 226 | } |
63f10f0f KK |
227 | |
228 | status = acpi_pci_run_osc(root->device->handle, capbuf, &result); | |
229 | if (ACPI_SUCCESS(status)) { | |
ab8e8957 | 230 | root->osc_support_set = support; |
2b8fd918 | 231 | if (control) |
ab8e8957 | 232 | *control = result; |
63f10f0f KK |
233 | } |
234 | return status; | |
235 | } | |
236 | ||
237 | static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) | |
238 | { | |
239 | acpi_status status; | |
63f10f0f | 240 | |
63f10f0f | 241 | mutex_lock(&osc_lock); |
ab8e8957 | 242 | status = acpi_pci_query_osc(root, flags, NULL); |
63f10f0f KK |
243 | mutex_unlock(&osc_lock); |
244 | return status; | |
245 | } | |
246 | ||
76d56de5 | 247 | struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) |
63f10f0f KK |
248 | { |
249 | struct acpi_pci_root *root; | |
cd4faf9c | 250 | struct acpi_device *device; |
c1aec834 | 251 | |
cd4faf9c TI |
252 | if (acpi_bus_get_device(handle, &device) || |
253 | acpi_match_device_ids(device, root_device_ids)) | |
254 | return NULL; | |
255 | ||
256 | root = acpi_driver_data(device); | |
257 | ||
258 | return root; | |
63f10f0f | 259 | } |
76d56de5 | 260 | EXPORT_SYMBOL_GPL(acpi_pci_find_root); |
63f10f0f | 261 | |
2f7bbceb AC |
262 | struct acpi_handle_node { |
263 | struct list_head node; | |
264 | acpi_handle handle; | |
265 | }; | |
266 | ||
267 | /** | |
268 | * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev | |
269 | * @handle: the handle in question | |
270 | * | |
271 | * Given an ACPI CA handle, the desired PCI device is located in the | |
272 | * list of PCI devices. | |
273 | * | |
274 | * If the device is found, its reference count is increased and this | |
275 | * function returns a pointer to its data structure. The caller must | |
276 | * decrement the reference count by calling pci_dev_put(). | |
277 | * If no device is found, %NULL is returned. | |
278 | */ | |
279 | struct pci_dev *acpi_get_pci_dev(acpi_handle handle) | |
280 | { | |
281 | int dev, fn; | |
282 | unsigned long long adr; | |
283 | acpi_status status; | |
284 | acpi_handle phandle; | |
285 | struct pci_bus *pbus; | |
286 | struct pci_dev *pdev = NULL; | |
287 | struct acpi_handle_node *node, *tmp; | |
288 | struct acpi_pci_root *root; | |
289 | LIST_HEAD(device_list); | |
290 | ||
291 | /* | |
292 | * Walk up the ACPI CA namespace until we reach a PCI root bridge. | |
293 | */ | |
294 | phandle = handle; | |
295 | while (!acpi_is_root_bridge(phandle)) { | |
296 | node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); | |
297 | if (!node) | |
298 | goto out; | |
299 | ||
300 | INIT_LIST_HEAD(&node->node); | |
301 | node->handle = phandle; | |
302 | list_add(&node->node, &device_list); | |
303 | ||
304 | status = acpi_get_parent(phandle, &phandle); | |
305 | if (ACPI_FAILURE(status)) | |
306 | goto out; | |
307 | } | |
308 | ||
309 | root = acpi_pci_find_root(phandle); | |
310 | if (!root) | |
311 | goto out; | |
312 | ||
313 | pbus = root->bus; | |
314 | ||
315 | /* | |
316 | * Now, walk back down the PCI device tree until we return to our | |
317 | * original handle. Assumes that everything between the PCI root | |
318 | * bridge and the device we're looking for must be a P2P bridge. | |
319 | */ | |
320 | list_for_each_entry(node, &device_list, node) { | |
321 | acpi_handle hnd = node->handle; | |
322 | status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); | |
323 | if (ACPI_FAILURE(status)) | |
324 | goto out; | |
325 | dev = (adr >> 16) & 0xffff; | |
326 | fn = adr & 0xffff; | |
327 | ||
328 | pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); | |
412af978 | 329 | if (!pdev || hnd == handle) |
2f7bbceb AC |
330 | break; |
331 | ||
332 | pbus = pdev->subordinate; | |
333 | pci_dev_put(pdev); | |
497fb54f RW |
334 | |
335 | /* | |
336 | * This function may be called for a non-PCI device that has a | |
337 | * PCI parent (eg. a disk under a PCI SATA controller). In that | |
338 | * case pdev->subordinate will be NULL for the parent. | |
339 | */ | |
340 | if (!pbus) { | |
341 | dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); | |
342 | pdev = NULL; | |
343 | break; | |
344 | } | |
2f7bbceb AC |
345 | } |
346 | out: | |
347 | list_for_each_entry_safe(node, tmp, &device_list, node) | |
348 | kfree(node); | |
349 | ||
350 | return pdev; | |
351 | } | |
352 | EXPORT_SYMBOL_GPL(acpi_get_pci_dev); | |
353 | ||
63f10f0f | 354 | /** |
75fb60f2 RW |
355 | * acpi_pci_osc_control_set - Request control of PCI root _OSC features. |
356 | * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). | |
357 | * @mask: Mask of _OSC bits to request control of, place to store control mask. | |
358 | * @req: Mask of _OSC bits the control of is essential to the caller. | |
63f10f0f | 359 | * |
75fb60f2 RW |
360 | * Run _OSC query for @mask and if that is successful, compare the returned |
361 | * mask of control bits with @req. If all of the @req bits are set in the | |
362 | * returned mask, run _OSC request for it. | |
363 | * | |
364 | * The variable at the @mask address may be modified regardless of whether or | |
365 | * not the function returns success. On success it will contain the mask of | |
366 | * _OSC bits the BIOS has granted control of, but its contents are meaningless | |
367 | * on failure. | |
63f10f0f | 368 | **/ |
75fb60f2 | 369 | acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) |
63f10f0f | 370 | { |
75fb60f2 | 371 | struct acpi_pci_root *root; |
4ffe6e54 | 372 | acpi_status status = AE_OK; |
75fb60f2 | 373 | u32 ctrl, capbuf[3]; |
63f10f0f | 374 | |
75fb60f2 RW |
375 | if (!mask) |
376 | return AE_BAD_PARAMETER; | |
377 | ||
378 | ctrl = *mask & OSC_PCI_CONTROL_MASKS; | |
379 | if ((ctrl & req) != req) | |
63f10f0f KK |
380 | return AE_TYPE; |
381 | ||
382 | root = acpi_pci_find_root(handle); | |
383 | if (!root) | |
384 | return AE_NOT_EXIST; | |
385 | ||
386 | mutex_lock(&osc_lock); | |
75fb60f2 RW |
387 | |
388 | *mask = ctrl | root->osc_control_set; | |
63f10f0f | 389 | /* No need to evaluate _OSC if the control was already granted. */ |
75fb60f2 | 390 | if ((root->osc_control_set & ctrl) == ctrl) |
63f10f0f KK |
391 | goto out; |
392 | ||
75fb60f2 RW |
393 | /* Need to check the available controls bits before requesting them. */ |
394 | while (*mask) { | |
395 | status = acpi_pci_query_osc(root, root->osc_support_set, mask); | |
396 | if (ACPI_FAILURE(status)) | |
397 | goto out; | |
398 | if (ctrl == *mask) | |
399 | break; | |
955f14b4 BH |
400 | decode_osc_control(root, "platform does not support", |
401 | ctrl & ~(*mask)); | |
75fb60f2 RW |
402 | ctrl = *mask; |
403 | } | |
2b8fd918 | 404 | |
75fb60f2 | 405 | if ((ctrl & req) != req) { |
955f14b4 BH |
406 | decode_osc_control(root, "not requesting control; platform does not support", |
407 | req & ~(ctrl)); | |
63f10f0f KK |
408 | status = AE_SUPPORT; |
409 | goto out; | |
410 | } | |
411 | ||
b938a229 BH |
412 | capbuf[OSC_QUERY_DWORD] = 0; |
413 | capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; | |
414 | capbuf[OSC_CONTROL_DWORD] = ctrl; | |
75fb60f2 | 415 | status = acpi_pci_run_osc(handle, capbuf, mask); |
63f10f0f | 416 | if (ACPI_SUCCESS(status)) |
75fb60f2 | 417 | root->osc_control_set = *mask; |
63f10f0f KK |
418 | out: |
419 | mutex_unlock(&osc_lock); | |
420 | return status; | |
421 | } | |
9f5404d8 | 422 | EXPORT_SYMBOL(acpi_pci_osc_control_set); |
63f10f0f | 423 | |
3e43abb0 BH |
424 | static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, |
425 | int *clear_aspm) | |
1da177e4 | 426 | { |
955f14b4 | 427 | u32 support, control, requested; |
3e43abb0 BH |
428 | acpi_status status; |
429 | struct acpi_device *device = root->device; | |
bfe2414a | 430 | acpi_handle handle = device->handle; |
1da177e4 | 431 | |
2786f6e3 | 432 | /* |
990a7ac5 AP |
433 | * All supported architectures that use ACPI have support for |
434 | * PCI domains, so we indicate this in _OSC support capabilities. | |
2786f6e3 | 435 | */ |
65afe916 | 436 | support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; |
8c33f51d | 437 | if (pci_ext_cfg_avail()) |
b8eb67fc | 438 | support |= OSC_PCI_EXT_CONFIG_SUPPORT; |
1b2a7be6 | 439 | if (pcie_aspm_support_enabled()) |
b8eb67fc | 440 | support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; |
07ae95f9 | 441 | if (pci_msi_enabled()) |
b8eb67fc | 442 | support |= OSC_PCI_MSI_SUPPORT; |
955f14b4 BH |
443 | |
444 | decode_osc_support(root, "OS supports", support); | |
1b2a7be6 BH |
445 | status = acpi_pci_osc_support(root, support); |
446 | if (ACPI_FAILURE(status)) { | |
65afe916 BH |
447 | dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", |
448 | acpi_format_exception(status)); | |
1b2a7be6 | 449 | *no_aspm = 1; |
65afe916 | 450 | return; |
2d9c8677 | 451 | } |
b8178f13 | 452 | |
43613a1f BH |
453 | if (pcie_ports_disabled) { |
454 | dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); | |
455 | return; | |
456 | } | |
457 | ||
de189662 | 458 | if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { |
955f14b4 BH |
459 | decode_osc_support(root, "not requesting OS control; OS requires", |
460 | ACPI_PCIE_REQ_SUPPORT); | |
de189662 BH |
461 | return; |
462 | } | |
463 | ||
464 | control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL | |
465 | | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL | |
466 | | OSC_PCI_EXPRESS_PME_CONTROL; | |
467 | ||
468 | if (pci_aer_available()) { | |
469 | if (aer_acpi_firmware_first()) | |
955f14b4 BH |
470 | dev_info(&device->dev, |
471 | "PCIe AER handled by firmware\n"); | |
de189662 BH |
472 | else |
473 | control |= OSC_PCI_EXPRESS_AER_CONTROL; | |
474 | } | |
415e12b2 | 475 | |
955f14b4 | 476 | requested = control; |
de189662 BH |
477 | status = acpi_pci_osc_control_set(handle, &control, |
478 | OSC_PCI_EXPRESS_CAPABILITY_CONTROL); | |
479 | if (ACPI_SUCCESS(status)) { | |
955f14b4 | 480 | decode_osc_control(root, "OS now controls", control); |
de189662 | 481 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
3dc48af3 | 482 | /* |
de189662 BH |
483 | * We have ASPM control, but the FADT indicates |
484 | * that it's unsupported. Clear it. | |
3dc48af3 | 485 | */ |
de189662 | 486 | *clear_aspm = 1; |
eca67315 | 487 | } |
a246670d | 488 | } else { |
955f14b4 BH |
489 | decode_osc_control(root, "OS requested", requested); |
490 | decode_osc_control(root, "platform willing to grant", control); | |
491 | dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", | |
492 | acpi_format_exception(status)); | |
493 | ||
de189662 BH |
494 | /* |
495 | * We want to disable ASPM here, but aspm_disabled | |
496 | * needs to remain in its state from boot so that we | |
497 | * properly handle PCIe 1.1 devices. So we set this | |
498 | * flag here, to defer the action until after the ACPI | |
499 | * root scan. | |
500 | */ | |
501 | *no_aspm = 1; | |
415e12b2 | 502 | } |
3e43abb0 BH |
503 | } |
504 | ||
00c43b96 RW |
505 | static int acpi_pci_root_add(struct acpi_device *device, |
506 | const struct acpi_device_id *not_used) | |
1da177e4 | 507 | { |
f5eebbe1 BH |
508 | unsigned long long segment, bus; |
509 | acpi_status status; | |
510 | int result; | |
511 | struct acpi_pci_root *root; | |
bfe2414a | 512 | acpi_handle handle = device->handle; |
3e43abb0 | 513 | int no_aspm = 0, clear_aspm = 0; |
1da177e4 | 514 | |
6ad95513 BH |
515 | root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); |
516 | if (!root) | |
517 | return -ENOMEM; | |
518 | ||
f5eebbe1 | 519 | segment = 0; |
bfe2414a | 520 | status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, |
f5eebbe1 BH |
521 | &segment); |
522 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
6dc7d22c | 523 | dev_err(&device->dev, "can't evaluate _SEG\n"); |
6ad95513 BH |
524 | result = -ENODEV; |
525 | goto end; | |
f5eebbe1 | 526 | } |
1da177e4 | 527 | |
f5eebbe1 | 528 | /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ |
6ad95513 | 529 | root->secondary.flags = IORESOURCE_BUS; |
bfe2414a | 530 | status = try_get_root_bridge_busnr(handle, &root->secondary); |
f5eebbe1 | 531 | if (ACPI_FAILURE(status)) { |
6ad95513 BH |
532 | /* |
533 | * We need both the start and end of the downstream bus range | |
534 | * to interpret _CBA (MMCONFIG base address), so it really is | |
535 | * supposed to be in _CRS. If we don't find it there, all we | |
536 | * can do is assume [_BBN-0xFF] or [0-0xFF]. | |
537 | */ | |
538 | root->secondary.end = 0xFF; | |
6dc7d22c JL |
539 | dev_warn(&device->dev, |
540 | FW_BUG "no secondary bus range in _CRS\n"); | |
bfe2414a | 541 | status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, |
e545b55a | 542 | NULL, &bus); |
6ad95513 BH |
543 | if (ACPI_SUCCESS(status)) |
544 | root->secondary.start = bus; | |
545 | else if (status == AE_NOT_FOUND) | |
546 | root->secondary.start = 0; | |
547 | else { | |
6dc7d22c | 548 | dev_err(&device->dev, "can't evaluate _BBN\n"); |
6ad95513 BH |
549 | result = -ENODEV; |
550 | goto end; | |
f5eebbe1 BH |
551 | } |
552 | } | |
1da177e4 | 553 | |
32917e5b | 554 | root->device = device; |
0705495d | 555 | root->segment = segment & 0xFFFF; |
1da177e4 LT |
556 | strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); |
557 | strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); | |
db89b4f0 | 558 | device->driver_data = root; |
1da177e4 | 559 | |
6dc7d22c | 560 | pr_info(PREFIX "%s [%s] (domain %04x %pR)\n", |
4be44fcd | 561 | acpi_device_name(device), acpi_device_bid(device), |
6ad95513 | 562 | root->segment, &root->secondary); |
1da177e4 | 563 | |
bfe2414a | 564 | root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); |
1da177e4 | 565 | |
3e43abb0 | 566 | negotiate_os_control(root, &no_aspm, &clear_aspm); |
415e12b2 | 567 | |
3dc48af3 NH |
568 | /* |
569 | * TBD: Need PCI interface for enumeration/configuration of roots. | |
570 | */ | |
571 | ||
572 | /* | |
573 | * Scan the Root Bridge | |
574 | * -------------------- | |
575 | * Must do this prior to any attempt to bind the root device, as the | |
576 | * PCI namespace does not get created until this call is made (and | |
577 | * thus the root bridge's pci_dev does not exist). | |
578 | */ | |
579 | root->bus = pci_acpi_scan_root(root); | |
580 | if (!root->bus) { | |
581 | dev_err(&device->dev, | |
582 | "Bus %04x:%02x not present in PCI namespace\n", | |
583 | root->segment, (unsigned int)root->secondary.start); | |
f516bde5 | 584 | device->driver_data = NULL; |
3dc48af3 NH |
585 | result = -ENODEV; |
586 | goto end; | |
587 | } | |
588 | ||
589 | if (clear_aspm) { | |
590 | dev_info(&device->dev, "Disabling ASPM (FADT indicates it is unsupported)\n"); | |
591 | pcie_clear_aspm(root->bus); | |
592 | } | |
593 | if (no_aspm) | |
594 | pcie_no_aspm(); | |
595 | ||
b67ea761 RW |
596 | pci_acpi_add_bus_pm_notifier(device, root->bus); |
597 | if (device->wakeup.flags.run_wake) | |
598 | device_set_run_wake(root->bus->bridge, true); | |
599 | ||
3c449ed0 YL |
600 | if (system_state != SYSTEM_BOOTING) { |
601 | pcibios_resource_survey_bus(root->bus); | |
39772038 | 602 | pci_assign_unassigned_root_bus_resources(root->bus); |
516ca223 | 603 | } |
62a08c5a | 604 | |
7a3bb55e | 605 | pci_lock_rescan_remove(); |
caf420c6 | 606 | pci_bus_add_devices(root->bus); |
7a3bb55e | 607 | pci_unlock_rescan_remove(); |
00c43b96 | 608 | return 1; |
47525cda | 609 | |
47525cda RW |
610 | end: |
611 | kfree(root); | |
612 | return result; | |
c431ada4 | 613 | } |
1da177e4 | 614 | |
00c43b96 | 615 | static void acpi_pci_root_remove(struct acpi_device *device) |
1da177e4 | 616 | { |
caf420c6 | 617 | struct acpi_pci_root *root = acpi_driver_data(device); |
c8e9afb1 | 618 | |
7a3bb55e RW |
619 | pci_lock_rescan_remove(); |
620 | ||
9738a1fd YL |
621 | pci_stop_root_bus(root->bus); |
622 | ||
b67ea761 RW |
623 | device_set_run_wake(root->bus->bridge, false); |
624 | pci_acpi_remove_bus_pm_notifier(device); | |
625 | ||
9738a1fd YL |
626 | pci_remove_root_bus(root->bus); |
627 | ||
7a3bb55e RW |
628 | pci_unlock_rescan_remove(); |
629 | ||
1da177e4 | 630 | kfree(root); |
1da177e4 LT |
631 | } |
632 | ||
00c43b96 | 633 | void __init acpi_pci_root_init(void) |
1da177e4 | 634 | { |
d3072e6a | 635 | acpi_hest_init(); |
3338db00 | 636 | if (acpi_pci_disabled) |
668192b6 | 637 | return; |
668192b6 | 638 | |
3338db00 RW |
639 | pci_acpi_crs_quirks(); |
640 | acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root"); | |
668192b6 | 641 | } |