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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> |
864b94ad | 36 | #include <linux/dmar.h> |
1da177e4 | 37 | #include <linux/acpi.h> |
5a0e3ad6 | 38 | #include <linux/slab.h> |
7bc5a2ba | 39 | #include <linux/dmi.h> |
8b48463f | 40 | #include <acpi/apei.h> /* for acpi_hest_init() */ |
1da177e4 | 41 | |
ace8238b RW |
42 | #include "internal.h" |
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 | |
3338db00 RW |
52 | static int acpi_pci_root_scan_dependent(struct acpi_device *adev) |
53 | { | |
1f7c164b | 54 | acpiphp_check_host_bridge(adev); |
3338db00 RW |
55 | return 0; |
56 | } | |
57 | ||
7dab9ef4 BH |
58 | #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ |
59 | | OSC_PCI_ASPM_SUPPORT \ | |
60 | | OSC_PCI_CLOCK_PM_SUPPORT \ | |
61 | | OSC_PCI_MSI_SUPPORT) | |
415e12b2 | 62 | |
c97adf9e | 63 | static const struct acpi_device_id root_device_ids[] = { |
1ba90e3a TR |
64 | {"PNP0A03", 0}, |
65 | {"", 0}, | |
66 | }; | |
1ba90e3a | 67 | |
00c43b96 | 68 | static struct acpi_scan_handler pci_root_handler = { |
1ba90e3a | 69 | .ids = root_device_ids, |
00c43b96 RW |
70 | .attach = acpi_pci_root_add, |
71 | .detach = acpi_pci_root_remove, | |
ca499fc8 | 72 | .hotplug = { |
3338db00 RW |
73 | .enabled = true, |
74 | .scan_dependent = acpi_pci_root_scan_dependent, | |
ca499fc8 | 75 | }, |
1da177e4 LT |
76 | }; |
77 | ||
63f10f0f | 78 | static DEFINE_MUTEX(osc_lock); |
1da177e4 | 79 | |
27558203 AC |
80 | /** |
81 | * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge | |
82 | * @handle - the ACPI CA node in question. | |
83 | * | |
84 | * Note: we could make this API take a struct acpi_device * instead, but | |
85 | * for now, it's more convenient to operate on an acpi_handle. | |
86 | */ | |
87 | int acpi_is_root_bridge(acpi_handle handle) | |
88 | { | |
89 | int ret; | |
90 | struct acpi_device *device; | |
91 | ||
92 | ret = acpi_bus_get_device(handle, &device); | |
93 | if (ret) | |
94 | return 0; | |
95 | ||
96 | ret = acpi_match_device_ids(device, root_device_ids); | |
97 | if (ret) | |
98 | return 0; | |
99 | else | |
100 | return 1; | |
101 | } | |
102 | EXPORT_SYMBOL_GPL(acpi_is_root_bridge); | |
103 | ||
1da177e4 | 104 | static acpi_status |
4be44fcd | 105 | get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) |
1da177e4 | 106 | { |
6ad95513 | 107 | struct resource *res = data; |
1da177e4 | 108 | struct acpi_resource_address64 address; |
f6c1c8ff | 109 | acpi_status status; |
1da177e4 | 110 | |
f6c1c8ff BH |
111 | status = acpi_resource_to_address64(resource, &address); |
112 | if (ACPI_FAILURE(status)) | |
1da177e4 LT |
113 | return AE_OK; |
114 | ||
a45de93e | 115 | if ((address.address.address_length > 0) && |
6ad95513 | 116 | (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { |
a45de93e LZ |
117 | res->start = address.address.minimum; |
118 | res->end = address.address.minimum + address.address.address_length - 1; | |
6ad95513 | 119 | } |
1da177e4 LT |
120 | |
121 | return AE_OK; | |
122 | } | |
123 | ||
f5eebbe1 | 124 | static acpi_status try_get_root_bridge_busnr(acpi_handle handle, |
6ad95513 | 125 | struct resource *res) |
1da177e4 LT |
126 | { |
127 | acpi_status status; | |
128 | ||
6ad95513 | 129 | res->start = -1; |
4be44fcd LB |
130 | status = |
131 | acpi_walk_resources(handle, METHOD_NAME__CRS, | |
6ad95513 | 132 | get_root_bridge_busnr_callback, res); |
1da177e4 LT |
133 | if (ACPI_FAILURE(status)) |
134 | return status; | |
6ad95513 | 135 | if (res->start == -1) |
1da177e4 LT |
136 | return AE_ERROR; |
137 | return AE_OK; | |
138 | } | |
139 | ||
955f14b4 BH |
140 | struct pci_osc_bit_struct { |
141 | u32 bit; | |
142 | char *desc; | |
143 | }; | |
144 | ||
145 | static struct pci_osc_bit_struct pci_osc_support_bit[] = { | |
146 | { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, | |
147 | { OSC_PCI_ASPM_SUPPORT, "ASPM" }, | |
148 | { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, | |
149 | { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, | |
150 | { OSC_PCI_MSI_SUPPORT, "MSI" }, | |
151 | }; | |
152 | ||
153 | static struct pci_osc_bit_struct pci_osc_control_bit[] = { | |
154 | { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" }, | |
155 | { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" }, | |
156 | { OSC_PCI_EXPRESS_PME_CONTROL, "PME" }, | |
157 | { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, | |
158 | { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, | |
159 | }; | |
160 | ||
161 | static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, | |
162 | struct pci_osc_bit_struct *table, int size) | |
163 | { | |
164 | char buf[80]; | |
165 | int i, len = 0; | |
166 | struct pci_osc_bit_struct *entry; | |
167 | ||
168 | buf[0] = '\0'; | |
169 | for (i = 0, entry = table; i < size; i++, entry++) | |
170 | if (word & entry->bit) | |
171 | len += snprintf(buf + len, sizeof(buf) - len, "%s%s", | |
172 | len ? " " : "", entry->desc); | |
173 | ||
174 | dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); | |
175 | } | |
176 | ||
177 | static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) | |
178 | { | |
179 | decode_osc_bits(root, msg, word, pci_osc_support_bit, | |
180 | ARRAY_SIZE(pci_osc_support_bit)); | |
181 | } | |
182 | ||
183 | static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) | |
184 | { | |
185 | decode_osc_bits(root, msg, word, pci_osc_control_bit, | |
186 | ARRAY_SIZE(pci_osc_control_bit)); | |
187 | } | |
188 | ||
3a9622dc | 189 | static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; |
63f10f0f KK |
190 | |
191 | static acpi_status acpi_pci_run_osc(acpi_handle handle, | |
192 | const u32 *capbuf, u32 *retval) | |
193 | { | |
3a9622dc SL |
194 | struct acpi_osc_context context = { |
195 | .uuid_str = pci_osc_uuid_str, | |
196 | .rev = 1, | |
197 | .cap.length = 12, | |
198 | .cap.pointer = (void *)capbuf, | |
199 | }; | |
63f10f0f | 200 | acpi_status status; |
63f10f0f | 201 | |
3a9622dc SL |
202 | status = acpi_run_osc(handle, &context); |
203 | if (ACPI_SUCCESS(status)) { | |
204 | *retval = *((u32 *)(context.ret.pointer + 8)); | |
205 | kfree(context.ret.pointer); | |
63f10f0f | 206 | } |
63f10f0f KK |
207 | return status; |
208 | } | |
209 | ||
ab8e8957 RW |
210 | static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, |
211 | u32 support, | |
212 | u32 *control) | |
63f10f0f KK |
213 | { |
214 | acpi_status status; | |
ab8e8957 RW |
215 | u32 result, capbuf[3]; |
216 | ||
217 | support &= OSC_PCI_SUPPORT_MASKS; | |
218 | support |= root->osc_support_set; | |
63f10f0f | 219 | |
b938a229 BH |
220 | capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; |
221 | capbuf[OSC_SUPPORT_DWORD] = support; | |
ab8e8957 RW |
222 | if (control) { |
223 | *control &= OSC_PCI_CONTROL_MASKS; | |
b938a229 | 224 | capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; |
ab8e8957 | 225 | } else { |
545d6e18 | 226 | /* Run _OSC query only with existing controls. */ |
b938a229 | 227 | capbuf[OSC_CONTROL_DWORD] = root->osc_control_set; |
ab8e8957 | 228 | } |
63f10f0f KK |
229 | |
230 | status = acpi_pci_run_osc(root->device->handle, capbuf, &result); | |
231 | if (ACPI_SUCCESS(status)) { | |
ab8e8957 | 232 | root->osc_support_set = support; |
2b8fd918 | 233 | if (control) |
ab8e8957 | 234 | *control = result; |
63f10f0f KK |
235 | } |
236 | return status; | |
237 | } | |
238 | ||
239 | static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) | |
240 | { | |
241 | acpi_status status; | |
63f10f0f | 242 | |
63f10f0f | 243 | mutex_lock(&osc_lock); |
ab8e8957 | 244 | status = acpi_pci_query_osc(root, flags, NULL); |
63f10f0f KK |
245 | mutex_unlock(&osc_lock); |
246 | return status; | |
247 | } | |
248 | ||
76d56de5 | 249 | struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) |
63f10f0f KK |
250 | { |
251 | struct acpi_pci_root *root; | |
cd4faf9c | 252 | struct acpi_device *device; |
c1aec834 | 253 | |
cd4faf9c TI |
254 | if (acpi_bus_get_device(handle, &device) || |
255 | acpi_match_device_ids(device, root_device_ids)) | |
256 | return NULL; | |
257 | ||
258 | root = acpi_driver_data(device); | |
259 | ||
260 | return root; | |
63f10f0f | 261 | } |
76d56de5 | 262 | EXPORT_SYMBOL_GPL(acpi_pci_find_root); |
63f10f0f | 263 | |
2f7bbceb AC |
264 | struct acpi_handle_node { |
265 | struct list_head node; | |
266 | acpi_handle handle; | |
267 | }; | |
268 | ||
269 | /** | |
270 | * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev | |
271 | * @handle: the handle in question | |
272 | * | |
273 | * Given an ACPI CA handle, the desired PCI device is located in the | |
274 | * list of PCI devices. | |
275 | * | |
276 | * If the device is found, its reference count is increased and this | |
277 | * function returns a pointer to its data structure. The caller must | |
278 | * decrement the reference count by calling pci_dev_put(). | |
279 | * If no device is found, %NULL is returned. | |
280 | */ | |
281 | struct pci_dev *acpi_get_pci_dev(acpi_handle handle) | |
282 | { | |
283 | int dev, fn; | |
284 | unsigned long long adr; | |
285 | acpi_status status; | |
286 | acpi_handle phandle; | |
287 | struct pci_bus *pbus; | |
288 | struct pci_dev *pdev = NULL; | |
289 | struct acpi_handle_node *node, *tmp; | |
290 | struct acpi_pci_root *root; | |
291 | LIST_HEAD(device_list); | |
292 | ||
293 | /* | |
294 | * Walk up the ACPI CA namespace until we reach a PCI root bridge. | |
295 | */ | |
296 | phandle = handle; | |
297 | while (!acpi_is_root_bridge(phandle)) { | |
298 | node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); | |
299 | if (!node) | |
300 | goto out; | |
301 | ||
302 | INIT_LIST_HEAD(&node->node); | |
303 | node->handle = phandle; | |
304 | list_add(&node->node, &device_list); | |
305 | ||
306 | status = acpi_get_parent(phandle, &phandle); | |
307 | if (ACPI_FAILURE(status)) | |
308 | goto out; | |
309 | } | |
310 | ||
311 | root = acpi_pci_find_root(phandle); | |
312 | if (!root) | |
313 | goto out; | |
314 | ||
315 | pbus = root->bus; | |
316 | ||
317 | /* | |
318 | * Now, walk back down the PCI device tree until we return to our | |
319 | * original handle. Assumes that everything between the PCI root | |
320 | * bridge and the device we're looking for must be a P2P bridge. | |
321 | */ | |
322 | list_for_each_entry(node, &device_list, node) { | |
323 | acpi_handle hnd = node->handle; | |
324 | status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); | |
325 | if (ACPI_FAILURE(status)) | |
326 | goto out; | |
327 | dev = (adr >> 16) & 0xffff; | |
328 | fn = adr & 0xffff; | |
329 | ||
330 | pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); | |
412af978 | 331 | if (!pdev || hnd == handle) |
2f7bbceb AC |
332 | break; |
333 | ||
334 | pbus = pdev->subordinate; | |
335 | pci_dev_put(pdev); | |
497fb54f RW |
336 | |
337 | /* | |
338 | * This function may be called for a non-PCI device that has a | |
339 | * PCI parent (eg. a disk under a PCI SATA controller). In that | |
340 | * case pdev->subordinate will be NULL for the parent. | |
341 | */ | |
342 | if (!pbus) { | |
343 | dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); | |
344 | pdev = NULL; | |
345 | break; | |
346 | } | |
2f7bbceb AC |
347 | } |
348 | out: | |
349 | list_for_each_entry_safe(node, tmp, &device_list, node) | |
350 | kfree(node); | |
351 | ||
352 | return pdev; | |
353 | } | |
354 | EXPORT_SYMBOL_GPL(acpi_get_pci_dev); | |
355 | ||
63f10f0f | 356 | /** |
75fb60f2 RW |
357 | * acpi_pci_osc_control_set - Request control of PCI root _OSC features. |
358 | * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). | |
359 | * @mask: Mask of _OSC bits to request control of, place to store control mask. | |
360 | * @req: Mask of _OSC bits the control of is essential to the caller. | |
63f10f0f | 361 | * |
75fb60f2 RW |
362 | * Run _OSC query for @mask and if that is successful, compare the returned |
363 | * mask of control bits with @req. If all of the @req bits are set in the | |
364 | * returned mask, run _OSC request for it. | |
365 | * | |
366 | * The variable at the @mask address may be modified regardless of whether or | |
367 | * not the function returns success. On success it will contain the mask of | |
368 | * _OSC bits the BIOS has granted control of, but its contents are meaningless | |
369 | * on failure. | |
63f10f0f | 370 | **/ |
75fb60f2 | 371 | acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) |
63f10f0f | 372 | { |
75fb60f2 | 373 | struct acpi_pci_root *root; |
4ffe6e54 | 374 | acpi_status status = AE_OK; |
75fb60f2 | 375 | u32 ctrl, capbuf[3]; |
63f10f0f | 376 | |
75fb60f2 RW |
377 | if (!mask) |
378 | return AE_BAD_PARAMETER; | |
379 | ||
380 | ctrl = *mask & OSC_PCI_CONTROL_MASKS; | |
381 | if ((ctrl & req) != req) | |
63f10f0f KK |
382 | return AE_TYPE; |
383 | ||
384 | root = acpi_pci_find_root(handle); | |
385 | if (!root) | |
386 | return AE_NOT_EXIST; | |
387 | ||
388 | mutex_lock(&osc_lock); | |
75fb60f2 RW |
389 | |
390 | *mask = ctrl | root->osc_control_set; | |
63f10f0f | 391 | /* No need to evaluate _OSC if the control was already granted. */ |
75fb60f2 | 392 | if ((root->osc_control_set & ctrl) == ctrl) |
63f10f0f KK |
393 | goto out; |
394 | ||
75fb60f2 RW |
395 | /* Need to check the available controls bits before requesting them. */ |
396 | while (*mask) { | |
397 | status = acpi_pci_query_osc(root, root->osc_support_set, mask); | |
398 | if (ACPI_FAILURE(status)) | |
399 | goto out; | |
400 | if (ctrl == *mask) | |
401 | break; | |
955f14b4 BH |
402 | decode_osc_control(root, "platform does not support", |
403 | ctrl & ~(*mask)); | |
75fb60f2 RW |
404 | ctrl = *mask; |
405 | } | |
2b8fd918 | 406 | |
75fb60f2 | 407 | if ((ctrl & req) != req) { |
955f14b4 BH |
408 | decode_osc_control(root, "not requesting control; platform does not support", |
409 | req & ~(ctrl)); | |
63f10f0f KK |
410 | status = AE_SUPPORT; |
411 | goto out; | |
412 | } | |
413 | ||
b938a229 BH |
414 | capbuf[OSC_QUERY_DWORD] = 0; |
415 | capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; | |
416 | capbuf[OSC_CONTROL_DWORD] = ctrl; | |
75fb60f2 | 417 | status = acpi_pci_run_osc(handle, capbuf, mask); |
63f10f0f | 418 | if (ACPI_SUCCESS(status)) |
75fb60f2 | 419 | root->osc_control_set = *mask; |
63f10f0f KK |
420 | out: |
421 | mutex_unlock(&osc_lock); | |
422 | return status; | |
423 | } | |
9f5404d8 | 424 | EXPORT_SYMBOL(acpi_pci_osc_control_set); |
63f10f0f | 425 | |
387d3757 | 426 | static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm) |
1da177e4 | 427 | { |
955f14b4 | 428 | u32 support, control, requested; |
3e43abb0 BH |
429 | acpi_status status; |
430 | struct acpi_device *device = root->device; | |
bfe2414a | 431 | acpi_handle handle = device->handle; |
1da177e4 | 432 | |
7bc5a2ba MG |
433 | /* |
434 | * Apple always return failure on _OSC calls when _OSI("Darwin") has | |
435 | * been called successfully. We know the feature set supported by the | |
436 | * platform, so avoid calling _OSC at all | |
437 | */ | |
438 | ||
439 | if (dmi_match(DMI_SYS_VENDOR, "Apple Inc.")) { | |
440 | root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL; | |
441 | decode_osc_control(root, "OS assumes control of", | |
442 | root->osc_control_set); | |
443 | return; | |
444 | } | |
445 | ||
2786f6e3 | 446 | /* |
990a7ac5 AP |
447 | * All supported architectures that use ACPI have support for |
448 | * PCI domains, so we indicate this in _OSC support capabilities. | |
2786f6e3 | 449 | */ |
65afe916 | 450 | support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; |
8c33f51d | 451 | if (pci_ext_cfg_avail()) |
b8eb67fc | 452 | support |= OSC_PCI_EXT_CONFIG_SUPPORT; |
1b2a7be6 | 453 | if (pcie_aspm_support_enabled()) |
b8eb67fc | 454 | support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; |
07ae95f9 | 455 | if (pci_msi_enabled()) |
b8eb67fc | 456 | support |= OSC_PCI_MSI_SUPPORT; |
955f14b4 BH |
457 | |
458 | decode_osc_support(root, "OS supports", support); | |
1b2a7be6 BH |
459 | status = acpi_pci_osc_support(root, support); |
460 | if (ACPI_FAILURE(status)) { | |
65afe916 BH |
461 | dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", |
462 | acpi_format_exception(status)); | |
1b2a7be6 | 463 | *no_aspm = 1; |
65afe916 | 464 | return; |
2d9c8677 | 465 | } |
b8178f13 | 466 | |
43613a1f BH |
467 | if (pcie_ports_disabled) { |
468 | dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); | |
469 | return; | |
470 | } | |
471 | ||
de189662 | 472 | if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { |
955f14b4 BH |
473 | decode_osc_support(root, "not requesting OS control; OS requires", |
474 | ACPI_PCIE_REQ_SUPPORT); | |
de189662 BH |
475 | return; |
476 | } | |
477 | ||
478 | control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL | |
479 | | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL | |
480 | | OSC_PCI_EXPRESS_PME_CONTROL; | |
481 | ||
482 | if (pci_aer_available()) { | |
483 | if (aer_acpi_firmware_first()) | |
955f14b4 BH |
484 | dev_info(&device->dev, |
485 | "PCIe AER handled by firmware\n"); | |
de189662 BH |
486 | else |
487 | control |= OSC_PCI_EXPRESS_AER_CONTROL; | |
488 | } | |
415e12b2 | 489 | |
955f14b4 | 490 | requested = control; |
de189662 BH |
491 | status = acpi_pci_osc_control_set(handle, &control, |
492 | OSC_PCI_EXPRESS_CAPABILITY_CONTROL); | |
493 | if (ACPI_SUCCESS(status)) { | |
955f14b4 | 494 | decode_osc_control(root, "OS now controls", control); |
de189662 | 495 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
3dc48af3 | 496 | /* |
387d3757 MG |
497 | * We have ASPM control, but the FADT indicates that |
498 | * it's unsupported. Leave existing configuration | |
499 | * intact and prevent the OS from touching it. | |
3dc48af3 | 500 | */ |
387d3757 MG |
501 | dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n"); |
502 | *no_aspm = 1; | |
eca67315 | 503 | } |
a246670d | 504 | } else { |
955f14b4 BH |
505 | decode_osc_control(root, "OS requested", requested); |
506 | decode_osc_control(root, "platform willing to grant", control); | |
507 | dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", | |
508 | acpi_format_exception(status)); | |
509 | ||
de189662 BH |
510 | /* |
511 | * We want to disable ASPM here, but aspm_disabled | |
512 | * needs to remain in its state from boot so that we | |
513 | * properly handle PCIe 1.1 devices. So we set this | |
514 | * flag here, to defer the action until after the ACPI | |
515 | * root scan. | |
516 | */ | |
517 | *no_aspm = 1; | |
415e12b2 | 518 | } |
3e43abb0 BH |
519 | } |
520 | ||
00c43b96 RW |
521 | static int acpi_pci_root_add(struct acpi_device *device, |
522 | const struct acpi_device_id *not_used) | |
1da177e4 | 523 | { |
f5eebbe1 BH |
524 | unsigned long long segment, bus; |
525 | acpi_status status; | |
526 | int result; | |
527 | struct acpi_pci_root *root; | |
bfe2414a | 528 | acpi_handle handle = device->handle; |
387d3757 | 529 | int no_aspm = 0; |
864b94ad | 530 | bool hotadd = system_state != SYSTEM_BOOTING; |
1da177e4 | 531 | |
6ad95513 BH |
532 | root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); |
533 | if (!root) | |
534 | return -ENOMEM; | |
535 | ||
f5eebbe1 | 536 | segment = 0; |
bfe2414a | 537 | status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, |
f5eebbe1 BH |
538 | &segment); |
539 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
6dc7d22c | 540 | dev_err(&device->dev, "can't evaluate _SEG\n"); |
6ad95513 BH |
541 | result = -ENODEV; |
542 | goto end; | |
f5eebbe1 | 543 | } |
1da177e4 | 544 | |
f5eebbe1 | 545 | /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ |
6ad95513 | 546 | root->secondary.flags = IORESOURCE_BUS; |
bfe2414a | 547 | status = try_get_root_bridge_busnr(handle, &root->secondary); |
f5eebbe1 | 548 | if (ACPI_FAILURE(status)) { |
6ad95513 BH |
549 | /* |
550 | * We need both the start and end of the downstream bus range | |
551 | * to interpret _CBA (MMCONFIG base address), so it really is | |
552 | * supposed to be in _CRS. If we don't find it there, all we | |
553 | * can do is assume [_BBN-0xFF] or [0-0xFF]. | |
554 | */ | |
555 | root->secondary.end = 0xFF; | |
6dc7d22c JL |
556 | dev_warn(&device->dev, |
557 | FW_BUG "no secondary bus range in _CRS\n"); | |
bfe2414a | 558 | status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, |
e545b55a | 559 | NULL, &bus); |
6ad95513 BH |
560 | if (ACPI_SUCCESS(status)) |
561 | root->secondary.start = bus; | |
562 | else if (status == AE_NOT_FOUND) | |
563 | root->secondary.start = 0; | |
564 | else { | |
6dc7d22c | 565 | dev_err(&device->dev, "can't evaluate _BBN\n"); |
6ad95513 BH |
566 | result = -ENODEV; |
567 | goto end; | |
f5eebbe1 BH |
568 | } |
569 | } | |
1da177e4 | 570 | |
32917e5b | 571 | root->device = device; |
0705495d | 572 | root->segment = segment & 0xFFFF; |
1da177e4 LT |
573 | strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); |
574 | strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); | |
db89b4f0 | 575 | device->driver_data = root; |
1da177e4 | 576 | |
864b94ad JL |
577 | if (hotadd && dmar_device_add(handle)) { |
578 | result = -ENXIO; | |
579 | goto end; | |
580 | } | |
581 | ||
6dc7d22c | 582 | pr_info(PREFIX "%s [%s] (domain %04x %pR)\n", |
4be44fcd | 583 | acpi_device_name(device), acpi_device_bid(device), |
6ad95513 | 584 | root->segment, &root->secondary); |
1da177e4 | 585 | |
bfe2414a | 586 | root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); |
1da177e4 | 587 | |
387d3757 | 588 | negotiate_os_control(root, &no_aspm); |
415e12b2 | 589 | |
3dc48af3 NH |
590 | /* |
591 | * TBD: Need PCI interface for enumeration/configuration of roots. | |
592 | */ | |
593 | ||
594 | /* | |
595 | * Scan the Root Bridge | |
596 | * -------------------- | |
597 | * Must do this prior to any attempt to bind the root device, as the | |
598 | * PCI namespace does not get created until this call is made (and | |
599 | * thus the root bridge's pci_dev does not exist). | |
600 | */ | |
601 | root->bus = pci_acpi_scan_root(root); | |
602 | if (!root->bus) { | |
603 | dev_err(&device->dev, | |
604 | "Bus %04x:%02x not present in PCI namespace\n", | |
605 | root->segment, (unsigned int)root->secondary.start); | |
f516bde5 | 606 | device->driver_data = NULL; |
3dc48af3 | 607 | result = -ENODEV; |
864b94ad | 608 | goto remove_dmar; |
3dc48af3 NH |
609 | } |
610 | ||
3dc48af3 NH |
611 | if (no_aspm) |
612 | pcie_no_aspm(); | |
613 | ||
c072530f | 614 | pci_acpi_add_bus_pm_notifier(device); |
b67ea761 RW |
615 | if (device->wakeup.flags.run_wake) |
616 | device_set_run_wake(root->bus->bridge, true); | |
617 | ||
864b94ad | 618 | if (hotadd) { |
3c449ed0 | 619 | pcibios_resource_survey_bus(root->bus); |
39772038 | 620 | pci_assign_unassigned_root_bus_resources(root->bus); |
c183619b | 621 | acpi_ioapic_add(root); |
516ca223 | 622 | } |
62a08c5a | 623 | |
7a3bb55e | 624 | pci_lock_rescan_remove(); |
caf420c6 | 625 | pci_bus_add_devices(root->bus); |
7a3bb55e | 626 | pci_unlock_rescan_remove(); |
00c43b96 | 627 | return 1; |
47525cda | 628 | |
864b94ad JL |
629 | remove_dmar: |
630 | if (hotadd) | |
631 | dmar_device_remove(handle); | |
47525cda RW |
632 | end: |
633 | kfree(root); | |
634 | return result; | |
c431ada4 | 635 | } |
1da177e4 | 636 | |
00c43b96 | 637 | static void acpi_pci_root_remove(struct acpi_device *device) |
1da177e4 | 638 | { |
caf420c6 | 639 | struct acpi_pci_root *root = acpi_driver_data(device); |
c8e9afb1 | 640 | |
7a3bb55e RW |
641 | pci_lock_rescan_remove(); |
642 | ||
9738a1fd YL |
643 | pci_stop_root_bus(root->bus); |
644 | ||
c183619b JL |
645 | WARN_ON(acpi_ioapic_remove(root)); |
646 | ||
b67ea761 RW |
647 | device_set_run_wake(root->bus->bridge, false); |
648 | pci_acpi_remove_bus_pm_notifier(device); | |
649 | ||
9738a1fd YL |
650 | pci_remove_root_bus(root->bus); |
651 | ||
864b94ad JL |
652 | dmar_device_remove(device->handle); |
653 | ||
7a3bb55e RW |
654 | pci_unlock_rescan_remove(); |
655 | ||
1da177e4 | 656 | kfree(root); |
1da177e4 LT |
657 | } |
658 | ||
00c43b96 | 659 | void __init acpi_pci_root_init(void) |
1da177e4 | 660 | { |
d3072e6a | 661 | acpi_hest_init(); |
3338db00 | 662 | if (acpi_pci_disabled) |
668192b6 | 663 | return; |
668192b6 | 664 | |
3338db00 RW |
665 | pci_acpi_crs_quirks(); |
666 | acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root"); | |
668192b6 | 667 | } |