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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 | |
ace8238b RW |
42 | #include "internal.h" |
43 | ||
a192a958 LB |
44 | #define PREFIX "ACPI: " |
45 | ||
1da177e4 | 46 | #define _COMPONENT ACPI_PCI_COMPONENT |
f52fd66d | 47 | ACPI_MODULE_NAME("pci_root"); |
1da177e4 | 48 | #define ACPI_PCI_ROOT_CLASS "pci_bridge" |
1da177e4 | 49 | #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" |
00c43b96 RW |
50 | static int acpi_pci_root_add(struct acpi_device *device, |
51 | const struct acpi_device_id *not_used); | |
52 | static void acpi_pci_root_remove(struct acpi_device *device); | |
1da177e4 | 53 | |
7dab9ef4 BH |
54 | #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ |
55 | | OSC_PCI_ASPM_SUPPORT \ | |
56 | | OSC_PCI_CLOCK_PM_SUPPORT \ | |
57 | | OSC_PCI_MSI_SUPPORT) | |
415e12b2 | 58 | |
c97adf9e | 59 | static const struct acpi_device_id root_device_ids[] = { |
1ba90e3a TR |
60 | {"PNP0A03", 0}, |
61 | {"", 0}, | |
62 | }; | |
1ba90e3a | 63 | |
00c43b96 | 64 | static struct acpi_scan_handler pci_root_handler = { |
1ba90e3a | 65 | .ids = root_device_ids, |
00c43b96 RW |
66 | .attach = acpi_pci_root_add, |
67 | .detach = acpi_pci_root_remove, | |
ca499fc8 TK |
68 | .hotplug = { |
69 | .ignore = true, | |
70 | }, | |
1da177e4 LT |
71 | }; |
72 | ||
63f10f0f | 73 | static DEFINE_MUTEX(osc_lock); |
1da177e4 | 74 | |
27558203 AC |
75 | /** |
76 | * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge | |
77 | * @handle - the ACPI CA node in question. | |
78 | * | |
79 | * Note: we could make this API take a struct acpi_device * instead, but | |
80 | * for now, it's more convenient to operate on an acpi_handle. | |
81 | */ | |
82 | int acpi_is_root_bridge(acpi_handle handle) | |
83 | { | |
84 | int ret; | |
85 | struct acpi_device *device; | |
86 | ||
87 | ret = acpi_bus_get_device(handle, &device); | |
88 | if (ret) | |
89 | return 0; | |
90 | ||
91 | ret = acpi_match_device_ids(device, root_device_ids); | |
92 | if (ret) | |
93 | return 0; | |
94 | else | |
95 | return 1; | |
96 | } | |
97 | EXPORT_SYMBOL_GPL(acpi_is_root_bridge); | |
98 | ||
1da177e4 | 99 | static acpi_status |
4be44fcd | 100 | get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) |
1da177e4 | 101 | { |
6ad95513 | 102 | struct resource *res = data; |
1da177e4 | 103 | struct acpi_resource_address64 address; |
f6c1c8ff | 104 | acpi_status status; |
1da177e4 | 105 | |
f6c1c8ff BH |
106 | status = acpi_resource_to_address64(resource, &address); |
107 | if (ACPI_FAILURE(status)) | |
1da177e4 LT |
108 | return AE_OK; |
109 | ||
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 | ||
955f14b4 BH |
135 | struct pci_osc_bit_struct { |
136 | u32 bit; | |
137 | char *desc; | |
138 | }; | |
139 | ||
140 | static struct pci_osc_bit_struct pci_osc_support_bit[] = { | |
141 | { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, | |
142 | { OSC_PCI_ASPM_SUPPORT, "ASPM" }, | |
143 | { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, | |
144 | { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, | |
145 | { OSC_PCI_MSI_SUPPORT, "MSI" }, | |
146 | }; | |
147 | ||
148 | static struct pci_osc_bit_struct pci_osc_control_bit[] = { | |
149 | { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" }, | |
150 | { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" }, | |
151 | { OSC_PCI_EXPRESS_PME_CONTROL, "PME" }, | |
152 | { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, | |
153 | { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, | |
154 | }; | |
155 | ||
156 | static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, | |
157 | struct pci_osc_bit_struct *table, int size) | |
158 | { | |
159 | char buf[80]; | |
160 | int i, len = 0; | |
161 | struct pci_osc_bit_struct *entry; | |
162 | ||
163 | buf[0] = '\0'; | |
164 | for (i = 0, entry = table; i < size; i++, entry++) | |
165 | if (word & entry->bit) | |
166 | len += snprintf(buf + len, sizeof(buf) - len, "%s%s", | |
167 | len ? " " : "", entry->desc); | |
168 | ||
169 | dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); | |
170 | } | |
171 | ||
172 | static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) | |
173 | { | |
174 | decode_osc_bits(root, msg, word, pci_osc_support_bit, | |
175 | ARRAY_SIZE(pci_osc_support_bit)); | |
176 | } | |
177 | ||
178 | static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) | |
179 | { | |
180 | decode_osc_bits(root, msg, word, pci_osc_control_bit, | |
181 | ARRAY_SIZE(pci_osc_control_bit)); | |
182 | } | |
183 | ||
3a9622dc | 184 | static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; |
63f10f0f KK |
185 | |
186 | static acpi_status acpi_pci_run_osc(acpi_handle handle, | |
187 | const u32 *capbuf, u32 *retval) | |
188 | { | |
3a9622dc SL |
189 | struct acpi_osc_context context = { |
190 | .uuid_str = pci_osc_uuid_str, | |
191 | .rev = 1, | |
192 | .cap.length = 12, | |
193 | .cap.pointer = (void *)capbuf, | |
194 | }; | |
63f10f0f | 195 | acpi_status status; |
63f10f0f | 196 | |
3a9622dc SL |
197 | status = acpi_run_osc(handle, &context); |
198 | if (ACPI_SUCCESS(status)) { | |
199 | *retval = *((u32 *)(context.ret.pointer + 8)); | |
200 | kfree(context.ret.pointer); | |
63f10f0f | 201 | } |
63f10f0f KK |
202 | return status; |
203 | } | |
204 | ||
ab8e8957 RW |
205 | static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, |
206 | u32 support, | |
207 | u32 *control) | |
63f10f0f KK |
208 | { |
209 | acpi_status status; | |
ab8e8957 RW |
210 | u32 result, capbuf[3]; |
211 | ||
212 | support &= OSC_PCI_SUPPORT_MASKS; | |
213 | support |= root->osc_support_set; | |
63f10f0f | 214 | |
b938a229 BH |
215 | capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; |
216 | capbuf[OSC_SUPPORT_DWORD] = support; | |
ab8e8957 RW |
217 | if (control) { |
218 | *control &= OSC_PCI_CONTROL_MASKS; | |
b938a229 | 219 | capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; |
ab8e8957 | 220 | } else { |
545d6e18 | 221 | /* Run _OSC query only with existing controls. */ |
b938a229 | 222 | capbuf[OSC_CONTROL_DWORD] = root->osc_control_set; |
ab8e8957 | 223 | } |
63f10f0f KK |
224 | |
225 | status = acpi_pci_run_osc(root->device->handle, capbuf, &result); | |
226 | if (ACPI_SUCCESS(status)) { | |
ab8e8957 | 227 | root->osc_support_set = support; |
2b8fd918 | 228 | if (control) |
ab8e8957 | 229 | *control = result; |
63f10f0f KK |
230 | } |
231 | return status; | |
232 | } | |
233 | ||
234 | static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) | |
235 | { | |
236 | acpi_status status; | |
63f10f0f | 237 | |
63f10f0f | 238 | mutex_lock(&osc_lock); |
ab8e8957 | 239 | status = acpi_pci_query_osc(root, flags, NULL); |
63f10f0f KK |
240 | mutex_unlock(&osc_lock); |
241 | return status; | |
242 | } | |
243 | ||
76d56de5 | 244 | struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) |
63f10f0f KK |
245 | { |
246 | struct acpi_pci_root *root; | |
cd4faf9c | 247 | struct acpi_device *device; |
c1aec834 | 248 | |
cd4faf9c TI |
249 | if (acpi_bus_get_device(handle, &device) || |
250 | acpi_match_device_ids(device, root_device_ids)) | |
251 | return NULL; | |
252 | ||
253 | root = acpi_driver_data(device); | |
254 | ||
255 | return root; | |
63f10f0f | 256 | } |
76d56de5 | 257 | EXPORT_SYMBOL_GPL(acpi_pci_find_root); |
63f10f0f | 258 | |
2f7bbceb AC |
259 | struct acpi_handle_node { |
260 | struct list_head node; | |
261 | acpi_handle handle; | |
262 | }; | |
263 | ||
264 | /** | |
265 | * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev | |
266 | * @handle: the handle in question | |
267 | * | |
268 | * Given an ACPI CA handle, the desired PCI device is located in the | |
269 | * list of PCI devices. | |
270 | * | |
271 | * If the device is found, its reference count is increased and this | |
272 | * function returns a pointer to its data structure. The caller must | |
273 | * decrement the reference count by calling pci_dev_put(). | |
274 | * If no device is found, %NULL is returned. | |
275 | */ | |
276 | struct pci_dev *acpi_get_pci_dev(acpi_handle handle) | |
277 | { | |
278 | int dev, fn; | |
279 | unsigned long long adr; | |
280 | acpi_status status; | |
281 | acpi_handle phandle; | |
282 | struct pci_bus *pbus; | |
283 | struct pci_dev *pdev = NULL; | |
284 | struct acpi_handle_node *node, *tmp; | |
285 | struct acpi_pci_root *root; | |
286 | LIST_HEAD(device_list); | |
287 | ||
288 | /* | |
289 | * Walk up the ACPI CA namespace until we reach a PCI root bridge. | |
290 | */ | |
291 | phandle = handle; | |
292 | while (!acpi_is_root_bridge(phandle)) { | |
293 | node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); | |
294 | if (!node) | |
295 | goto out; | |
296 | ||
297 | INIT_LIST_HEAD(&node->node); | |
298 | node->handle = phandle; | |
299 | list_add(&node->node, &device_list); | |
300 | ||
301 | status = acpi_get_parent(phandle, &phandle); | |
302 | if (ACPI_FAILURE(status)) | |
303 | goto out; | |
304 | } | |
305 | ||
306 | root = acpi_pci_find_root(phandle); | |
307 | if (!root) | |
308 | goto out; | |
309 | ||
310 | pbus = root->bus; | |
311 | ||
312 | /* | |
313 | * Now, walk back down the PCI device tree until we return to our | |
314 | * original handle. Assumes that everything between the PCI root | |
315 | * bridge and the device we're looking for must be a P2P bridge. | |
316 | */ | |
317 | list_for_each_entry(node, &device_list, node) { | |
318 | acpi_handle hnd = node->handle; | |
319 | status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); | |
320 | if (ACPI_FAILURE(status)) | |
321 | goto out; | |
322 | dev = (adr >> 16) & 0xffff; | |
323 | fn = adr & 0xffff; | |
324 | ||
325 | pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); | |
412af978 | 326 | if (!pdev || hnd == handle) |
2f7bbceb AC |
327 | break; |
328 | ||
329 | pbus = pdev->subordinate; | |
330 | pci_dev_put(pdev); | |
497fb54f RW |
331 | |
332 | /* | |
333 | * This function may be called for a non-PCI device that has a | |
334 | * PCI parent (eg. a disk under a PCI SATA controller). In that | |
335 | * case pdev->subordinate will be NULL for the parent. | |
336 | */ | |
337 | if (!pbus) { | |
338 | dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); | |
339 | pdev = NULL; | |
340 | break; | |
341 | } | |
2f7bbceb AC |
342 | } |
343 | out: | |
344 | list_for_each_entry_safe(node, tmp, &device_list, node) | |
345 | kfree(node); | |
346 | ||
347 | return pdev; | |
348 | } | |
349 | EXPORT_SYMBOL_GPL(acpi_get_pci_dev); | |
350 | ||
63f10f0f | 351 | /** |
75fb60f2 RW |
352 | * acpi_pci_osc_control_set - Request control of PCI root _OSC features. |
353 | * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). | |
354 | * @mask: Mask of _OSC bits to request control of, place to store control mask. | |
355 | * @req: Mask of _OSC bits the control of is essential to the caller. | |
63f10f0f | 356 | * |
75fb60f2 RW |
357 | * Run _OSC query for @mask and if that is successful, compare the returned |
358 | * mask of control bits with @req. If all of the @req bits are set in the | |
359 | * returned mask, run _OSC request for it. | |
360 | * | |
361 | * The variable at the @mask address may be modified regardless of whether or | |
362 | * not the function returns success. On success it will contain the mask of | |
363 | * _OSC bits the BIOS has granted control of, but its contents are meaningless | |
364 | * on failure. | |
63f10f0f | 365 | **/ |
75fb60f2 | 366 | acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) |
63f10f0f | 367 | { |
75fb60f2 | 368 | struct acpi_pci_root *root; |
4ffe6e54 | 369 | acpi_status status = AE_OK; |
75fb60f2 | 370 | u32 ctrl, capbuf[3]; |
63f10f0f | 371 | |
75fb60f2 RW |
372 | if (!mask) |
373 | return AE_BAD_PARAMETER; | |
374 | ||
375 | ctrl = *mask & OSC_PCI_CONTROL_MASKS; | |
376 | if ((ctrl & req) != req) | |
63f10f0f KK |
377 | return AE_TYPE; |
378 | ||
379 | root = acpi_pci_find_root(handle); | |
380 | if (!root) | |
381 | return AE_NOT_EXIST; | |
382 | ||
383 | mutex_lock(&osc_lock); | |
75fb60f2 RW |
384 | |
385 | *mask = ctrl | root->osc_control_set; | |
63f10f0f | 386 | /* No need to evaluate _OSC if the control was already granted. */ |
75fb60f2 | 387 | if ((root->osc_control_set & ctrl) == ctrl) |
63f10f0f KK |
388 | goto out; |
389 | ||
75fb60f2 RW |
390 | /* Need to check the available controls bits before requesting them. */ |
391 | while (*mask) { | |
392 | status = acpi_pci_query_osc(root, root->osc_support_set, mask); | |
393 | if (ACPI_FAILURE(status)) | |
394 | goto out; | |
395 | if (ctrl == *mask) | |
396 | break; | |
955f14b4 BH |
397 | decode_osc_control(root, "platform does not support", |
398 | ctrl & ~(*mask)); | |
75fb60f2 RW |
399 | ctrl = *mask; |
400 | } | |
2b8fd918 | 401 | |
75fb60f2 | 402 | if ((ctrl & req) != req) { |
955f14b4 BH |
403 | decode_osc_control(root, "not requesting control; platform does not support", |
404 | req & ~(ctrl)); | |
63f10f0f KK |
405 | status = AE_SUPPORT; |
406 | goto out; | |
407 | } | |
408 | ||
b938a229 BH |
409 | capbuf[OSC_QUERY_DWORD] = 0; |
410 | capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; | |
411 | capbuf[OSC_CONTROL_DWORD] = ctrl; | |
75fb60f2 | 412 | status = acpi_pci_run_osc(handle, capbuf, mask); |
63f10f0f | 413 | if (ACPI_SUCCESS(status)) |
75fb60f2 | 414 | root->osc_control_set = *mask; |
63f10f0f KK |
415 | out: |
416 | mutex_unlock(&osc_lock); | |
417 | return status; | |
418 | } | |
9f5404d8 | 419 | EXPORT_SYMBOL(acpi_pci_osc_control_set); |
63f10f0f | 420 | |
3e43abb0 BH |
421 | static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, |
422 | int *clear_aspm) | |
1da177e4 | 423 | { |
955f14b4 | 424 | u32 support, control, requested; |
3e43abb0 BH |
425 | acpi_status status; |
426 | struct acpi_device *device = root->device; | |
bfe2414a | 427 | acpi_handle handle = device->handle; |
1da177e4 | 428 | |
2786f6e3 | 429 | /* |
990a7ac5 AP |
430 | * All supported architectures that use ACPI have support for |
431 | * PCI domains, so we indicate this in _OSC support capabilities. | |
2786f6e3 | 432 | */ |
65afe916 | 433 | support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; |
8c33f51d | 434 | if (pci_ext_cfg_avail()) |
b8eb67fc | 435 | support |= OSC_PCI_EXT_CONFIG_SUPPORT; |
1b2a7be6 | 436 | if (pcie_aspm_support_enabled()) |
b8eb67fc | 437 | support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; |
07ae95f9 | 438 | if (pci_msi_enabled()) |
b8eb67fc | 439 | support |= OSC_PCI_MSI_SUPPORT; |
955f14b4 BH |
440 | |
441 | decode_osc_support(root, "OS supports", support); | |
1b2a7be6 BH |
442 | status = acpi_pci_osc_support(root, support); |
443 | if (ACPI_FAILURE(status)) { | |
65afe916 BH |
444 | dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", |
445 | acpi_format_exception(status)); | |
1b2a7be6 | 446 | *no_aspm = 1; |
65afe916 | 447 | return; |
2d9c8677 | 448 | } |
b8178f13 | 449 | |
43613a1f BH |
450 | if (pcie_ports_disabled) { |
451 | dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); | |
452 | return; | |
453 | } | |
454 | ||
de189662 | 455 | if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { |
955f14b4 BH |
456 | decode_osc_support(root, "not requesting OS control; OS requires", |
457 | ACPI_PCIE_REQ_SUPPORT); | |
de189662 BH |
458 | return; |
459 | } | |
460 | ||
461 | control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL | |
462 | | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL | |
463 | | OSC_PCI_EXPRESS_PME_CONTROL; | |
464 | ||
465 | if (pci_aer_available()) { | |
466 | if (aer_acpi_firmware_first()) | |
955f14b4 BH |
467 | dev_info(&device->dev, |
468 | "PCIe AER handled by firmware\n"); | |
de189662 BH |
469 | else |
470 | control |= OSC_PCI_EXPRESS_AER_CONTROL; | |
471 | } | |
415e12b2 | 472 | |
955f14b4 | 473 | requested = control; |
de189662 BH |
474 | status = acpi_pci_osc_control_set(handle, &control, |
475 | OSC_PCI_EXPRESS_CAPABILITY_CONTROL); | |
476 | if (ACPI_SUCCESS(status)) { | |
955f14b4 | 477 | decode_osc_control(root, "OS now controls", control); |
de189662 | 478 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
3dc48af3 | 479 | /* |
de189662 BH |
480 | * We have ASPM control, but the FADT indicates |
481 | * that it's unsupported. Clear it. | |
3dc48af3 | 482 | */ |
de189662 | 483 | *clear_aspm = 1; |
eca67315 | 484 | } |
a246670d | 485 | } else { |
955f14b4 BH |
486 | decode_osc_control(root, "OS requested", requested); |
487 | decode_osc_control(root, "platform willing to grant", control); | |
488 | dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", | |
489 | acpi_format_exception(status)); | |
490 | ||
de189662 BH |
491 | /* |
492 | * We want to disable ASPM here, but aspm_disabled | |
493 | * needs to remain in its state from boot so that we | |
494 | * properly handle PCIe 1.1 devices. So we set this | |
495 | * flag here, to defer the action until after the ACPI | |
496 | * root scan. | |
497 | */ | |
498 | *no_aspm = 1; | |
415e12b2 | 499 | } |
3e43abb0 BH |
500 | } |
501 | ||
00c43b96 RW |
502 | static int acpi_pci_root_add(struct acpi_device *device, |
503 | const struct acpi_device_id *not_used) | |
1da177e4 | 504 | { |
f5eebbe1 BH |
505 | unsigned long long segment, bus; |
506 | acpi_status status; | |
507 | int result; | |
508 | struct acpi_pci_root *root; | |
bfe2414a | 509 | acpi_handle handle = device->handle; |
3e43abb0 | 510 | int no_aspm = 0, clear_aspm = 0; |
1da177e4 | 511 | |
6ad95513 BH |
512 | root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); |
513 | if (!root) | |
514 | return -ENOMEM; | |
515 | ||
f5eebbe1 | 516 | segment = 0; |
bfe2414a | 517 | status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, |
f5eebbe1 BH |
518 | &segment); |
519 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
6dc7d22c | 520 | dev_err(&device->dev, "can't evaluate _SEG\n"); |
6ad95513 BH |
521 | result = -ENODEV; |
522 | goto end; | |
f5eebbe1 | 523 | } |
1da177e4 | 524 | |
f5eebbe1 | 525 | /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ |
6ad95513 | 526 | root->secondary.flags = IORESOURCE_BUS; |
bfe2414a | 527 | status = try_get_root_bridge_busnr(handle, &root->secondary); |
f5eebbe1 | 528 | if (ACPI_FAILURE(status)) { |
6ad95513 BH |
529 | /* |
530 | * We need both the start and end of the downstream bus range | |
531 | * to interpret _CBA (MMCONFIG base address), so it really is | |
532 | * supposed to be in _CRS. If we don't find it there, all we | |
533 | * can do is assume [_BBN-0xFF] or [0-0xFF]. | |
534 | */ | |
535 | root->secondary.end = 0xFF; | |
6dc7d22c JL |
536 | dev_warn(&device->dev, |
537 | FW_BUG "no secondary bus range in _CRS\n"); | |
bfe2414a | 538 | status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, |
e545b55a | 539 | NULL, &bus); |
6ad95513 BH |
540 | if (ACPI_SUCCESS(status)) |
541 | root->secondary.start = bus; | |
542 | else if (status == AE_NOT_FOUND) | |
543 | root->secondary.start = 0; | |
544 | else { | |
6dc7d22c | 545 | dev_err(&device->dev, "can't evaluate _BBN\n"); |
6ad95513 BH |
546 | result = -ENODEV; |
547 | goto end; | |
f5eebbe1 BH |
548 | } |
549 | } | |
1da177e4 | 550 | |
32917e5b | 551 | root->device = device; |
0705495d | 552 | root->segment = segment & 0xFFFF; |
1da177e4 LT |
553 | strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); |
554 | strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); | |
db89b4f0 | 555 | device->driver_data = root; |
1da177e4 | 556 | |
6dc7d22c | 557 | pr_info(PREFIX "%s [%s] (domain %04x %pR)\n", |
4be44fcd | 558 | acpi_device_name(device), acpi_device_bid(device), |
6ad95513 | 559 | root->segment, &root->secondary); |
1da177e4 | 560 | |
bfe2414a | 561 | root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); |
1da177e4 | 562 | |
3e43abb0 | 563 | negotiate_os_control(root, &no_aspm, &clear_aspm); |
415e12b2 | 564 | |
3dc48af3 NH |
565 | /* |
566 | * TBD: Need PCI interface for enumeration/configuration of roots. | |
567 | */ | |
568 | ||
569 | /* | |
570 | * Scan the Root Bridge | |
571 | * -------------------- | |
572 | * Must do this prior to any attempt to bind the root device, as the | |
573 | * PCI namespace does not get created until this call is made (and | |
574 | * thus the root bridge's pci_dev does not exist). | |
575 | */ | |
576 | root->bus = pci_acpi_scan_root(root); | |
577 | if (!root->bus) { | |
578 | dev_err(&device->dev, | |
579 | "Bus %04x:%02x not present in PCI namespace\n", | |
580 | root->segment, (unsigned int)root->secondary.start); | |
f516bde5 | 581 | device->driver_data = NULL; |
3dc48af3 NH |
582 | result = -ENODEV; |
583 | goto end; | |
584 | } | |
585 | ||
586 | if (clear_aspm) { | |
587 | dev_info(&device->dev, "Disabling ASPM (FADT indicates it is unsupported)\n"); | |
588 | pcie_clear_aspm(root->bus); | |
589 | } | |
590 | if (no_aspm) | |
591 | pcie_no_aspm(); | |
592 | ||
b67ea761 RW |
593 | pci_acpi_add_bus_pm_notifier(device, root->bus); |
594 | if (device->wakeup.flags.run_wake) | |
595 | device_set_run_wake(root->bus->bridge, true); | |
596 | ||
3c449ed0 YL |
597 | if (system_state != SYSTEM_BOOTING) { |
598 | pcibios_resource_survey_bus(root->bus); | |
39772038 | 599 | pci_assign_unassigned_root_bus_resources(root->bus); |
516ca223 | 600 | } |
62a08c5a | 601 | |
caf420c6 | 602 | pci_bus_add_devices(root->bus); |
00c43b96 | 603 | return 1; |
47525cda | 604 | |
47525cda RW |
605 | end: |
606 | kfree(root); | |
607 | return result; | |
c431ada4 | 608 | } |
1da177e4 | 609 | |
00c43b96 | 610 | static void acpi_pci_root_remove(struct acpi_device *device) |
1da177e4 | 611 | { |
caf420c6 | 612 | struct acpi_pci_root *root = acpi_driver_data(device); |
c8e9afb1 | 613 | |
9738a1fd YL |
614 | pci_stop_root_bus(root->bus); |
615 | ||
b67ea761 RW |
616 | device_set_run_wake(root->bus->bridge, false); |
617 | pci_acpi_remove_bus_pm_notifier(device); | |
618 | ||
9738a1fd YL |
619 | pci_remove_root_bus(root->bus); |
620 | ||
1da177e4 | 621 | kfree(root); |
1da177e4 LT |
622 | } |
623 | ||
00c43b96 | 624 | void __init acpi_pci_root_init(void) |
1da177e4 | 625 | { |
d3072e6a RW |
626 | acpi_hest_init(); |
627 | ||
00c43b96 RW |
628 | if (!acpi_pci_disabled) { |
629 | pci_acpi_crs_quirks(); | |
630 | acpi_scan_add_handler(&pci_root_handler); | |
631 | } | |
1da177e4 | 632 | } |
668192b6 YL |
633 | /* Support root bridge hotplug */ |
634 | ||
635 | static void handle_root_bridge_insertion(acpi_handle handle) | |
636 | { | |
637 | struct acpi_device *device; | |
638 | ||
639 | if (!acpi_bus_get_device(handle, &device)) { | |
6dc7d22c JL |
640 | dev_printk(KERN_DEBUG, &device->dev, |
641 | "acpi device already exists; ignoring notify\n"); | |
668192b6 YL |
642 | return; |
643 | } | |
644 | ||
645 | if (acpi_bus_scan(handle)) | |
6dc7d22c | 646 | acpi_handle_err(handle, "cannot add bridge to acpi list\n"); |
668192b6 YL |
647 | } |
648 | ||
7b98118a | 649 | static void hotplug_event_root(void *data, u32 type) |
668192b6 | 650 | { |
7b98118a | 651 | acpi_handle handle = data; |
668192b6 | 652 | struct acpi_pci_root *root; |
668192b6 | 653 | |
b8b66110 | 654 | acpi_scan_lock_acquire(); |
668192b6 | 655 | |
b8b66110 | 656 | root = acpi_pci_find_root(handle); |
668192b6 YL |
657 | |
658 | switch (type) { | |
659 | case ACPI_NOTIFY_BUS_CHECK: | |
660 | /* bus enumerate */ | |
6dc7d22c JL |
661 | acpi_handle_printk(KERN_DEBUG, handle, |
662 | "Bus check notify on %s\n", __func__); | |
3f327e39 YL |
663 | if (root) |
664 | acpiphp_check_host_bridge(handle); | |
665 | else | |
668192b6 YL |
666 | handle_root_bridge_insertion(handle); |
667 | ||
668 | break; | |
669 | ||
670 | case ACPI_NOTIFY_DEVICE_CHECK: | |
671 | /* device check */ | |
6dc7d22c JL |
672 | acpi_handle_printk(KERN_DEBUG, handle, |
673 | "Device check notify on %s\n", __func__); | |
668192b6 YL |
674 | if (!root) |
675 | handle_root_bridge_insertion(handle); | |
676 | break; | |
677 | ||
678 | case ACPI_NOTIFY_EJECT_REQUEST: | |
679 | /* request device eject */ | |
6dc7d22c JL |
680 | acpi_handle_printk(KERN_DEBUG, handle, |
681 | "Device eject notify on %s\n", __func__); | |
43d38883 RW |
682 | if (!root) |
683 | break; | |
684 | ||
685 | get_device(&root->device->dev); | |
686 | ||
687 | acpi_scan_lock_release(); | |
688 | ||
689 | acpi_bus_device_eject(root->device, ACPI_NOTIFY_EJECT_REQUEST); | |
690 | return; | |
668192b6 | 691 | default: |
6dc7d22c JL |
692 | acpi_handle_warn(handle, |
693 | "notify_handler: unknown event type 0x%x\n", | |
694 | type); | |
668192b6 YL |
695 | break; |
696 | } | |
697 | ||
b8b66110 | 698 | acpi_scan_lock_release(); |
668192b6 YL |
699 | } |
700 | ||
701 | static void handle_hotplug_event_root(acpi_handle handle, u32 type, | |
702 | void *context) | |
703 | { | |
7b98118a | 704 | acpi_hotplug_execute(hotplug_event_root, handle, type); |
668192b6 YL |
705 | } |
706 | ||
707 | static acpi_status __init | |
708 | find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) | |
709 | { | |
121b090e | 710 | acpi_status status; |
668192b6 YL |
711 | int *count = (int *)context; |
712 | ||
713 | if (!acpi_is_root_bridge(handle)) | |
714 | return AE_OK; | |
715 | ||
716 | (*count)++; | |
717 | ||
121b090e TC |
718 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
719 | handle_hotplug_event_root, NULL); | |
720 | if (ACPI_FAILURE(status)) | |
6dc7d22c JL |
721 | acpi_handle_printk(KERN_DEBUG, handle, |
722 | "notify handler is not installed, exit status: %u\n", | |
723 | (unsigned int)status); | |
121b090e | 724 | else |
6dc7d22c JL |
725 | acpi_handle_printk(KERN_DEBUG, handle, |
726 | "notify handler is installed\n"); | |
668192b6 YL |
727 | |
728 | return AE_OK; | |
729 | } | |
730 | ||
731 | void __init acpi_pci_root_hp_init(void) | |
732 | { | |
733 | int num = 0; | |
734 | ||
735 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
736 | ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL); | |
737 | ||
738 | printk(KERN_DEBUG "Found %d acpi root devices\n", num); | |
739 | } |