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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 | |
7dab9ef4 BH |
52 | #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ |
53 | | OSC_PCI_ASPM_SUPPORT \ | |
54 | | OSC_PCI_CLOCK_PM_SUPPORT \ | |
55 | | OSC_PCI_MSI_SUPPORT) | |
415e12b2 | 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 | ||
63f10f0f | 68 | static DEFINE_MUTEX(osc_lock); |
1da177e4 | 69 | |
27558203 AC |
70 | /** |
71 | * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge | |
72 | * @handle - the ACPI CA node in question. | |
73 | * | |
74 | * Note: we could make this API take a struct acpi_device * instead, but | |
75 | * for now, it's more convenient to operate on an acpi_handle. | |
76 | */ | |
77 | int acpi_is_root_bridge(acpi_handle handle) | |
78 | { | |
79 | int ret; | |
80 | struct acpi_device *device; | |
81 | ||
82 | ret = acpi_bus_get_device(handle, &device); | |
83 | if (ret) | |
84 | return 0; | |
85 | ||
86 | ret = acpi_match_device_ids(device, root_device_ids); | |
87 | if (ret) | |
88 | return 0; | |
89 | else | |
90 | return 1; | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(acpi_is_root_bridge); | |
93 | ||
1da177e4 | 94 | static acpi_status |
4be44fcd | 95 | get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) |
1da177e4 | 96 | { |
6ad95513 | 97 | struct resource *res = data; |
1da177e4 | 98 | struct acpi_resource_address64 address; |
f6c1c8ff | 99 | acpi_status status; |
1da177e4 | 100 | |
f6c1c8ff BH |
101 | status = acpi_resource_to_address64(resource, &address); |
102 | if (ACPI_FAILURE(status)) | |
1da177e4 LT |
103 | return AE_OK; |
104 | ||
4be44fcd | 105 | if ((address.address_length > 0) && |
6ad95513 BH |
106 | (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { |
107 | res->start = address.minimum; | |
108 | res->end = address.minimum + address.address_length - 1; | |
109 | } | |
1da177e4 LT |
110 | |
111 | return AE_OK; | |
112 | } | |
113 | ||
f5eebbe1 | 114 | static acpi_status try_get_root_bridge_busnr(acpi_handle handle, |
6ad95513 | 115 | struct resource *res) |
1da177e4 LT |
116 | { |
117 | acpi_status status; | |
118 | ||
6ad95513 | 119 | res->start = -1; |
4be44fcd LB |
120 | status = |
121 | acpi_walk_resources(handle, METHOD_NAME__CRS, | |
6ad95513 | 122 | get_root_bridge_busnr_callback, res); |
1da177e4 LT |
123 | if (ACPI_FAILURE(status)) |
124 | return status; | |
6ad95513 | 125 | if (res->start == -1) |
1da177e4 LT |
126 | return AE_ERROR; |
127 | return AE_OK; | |
128 | } | |
129 | ||
3a9622dc | 130 | static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; |
63f10f0f KK |
131 | |
132 | static acpi_status acpi_pci_run_osc(acpi_handle handle, | |
133 | const u32 *capbuf, u32 *retval) | |
134 | { | |
3a9622dc SL |
135 | struct acpi_osc_context context = { |
136 | .uuid_str = pci_osc_uuid_str, | |
137 | .rev = 1, | |
138 | .cap.length = 12, | |
139 | .cap.pointer = (void *)capbuf, | |
140 | }; | |
63f10f0f | 141 | acpi_status status; |
63f10f0f | 142 | |
3a9622dc SL |
143 | status = acpi_run_osc(handle, &context); |
144 | if (ACPI_SUCCESS(status)) { | |
145 | *retval = *((u32 *)(context.ret.pointer + 8)); | |
146 | kfree(context.ret.pointer); | |
63f10f0f | 147 | } |
63f10f0f KK |
148 | return status; |
149 | } | |
150 | ||
ab8e8957 RW |
151 | static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, |
152 | u32 support, | |
153 | u32 *control) | |
63f10f0f KK |
154 | { |
155 | acpi_status status; | |
ab8e8957 RW |
156 | u32 result, capbuf[3]; |
157 | ||
158 | support &= OSC_PCI_SUPPORT_MASKS; | |
159 | support |= root->osc_support_set; | |
63f10f0f | 160 | |
b938a229 BH |
161 | capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; |
162 | capbuf[OSC_SUPPORT_DWORD] = support; | |
ab8e8957 RW |
163 | if (control) { |
164 | *control &= OSC_PCI_CONTROL_MASKS; | |
b938a229 | 165 | capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; |
ab8e8957 | 166 | } else { |
545d6e18 | 167 | /* Run _OSC query only with existing controls. */ |
b938a229 | 168 | capbuf[OSC_CONTROL_DWORD] = root->osc_control_set; |
ab8e8957 | 169 | } |
63f10f0f KK |
170 | |
171 | status = acpi_pci_run_osc(root->device->handle, capbuf, &result); | |
172 | if (ACPI_SUCCESS(status)) { | |
ab8e8957 | 173 | root->osc_support_set = support; |
2b8fd918 | 174 | if (control) |
ab8e8957 | 175 | *control = result; |
63f10f0f KK |
176 | } |
177 | return status; | |
178 | } | |
179 | ||
180 | static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) | |
181 | { | |
182 | acpi_status status; | |
63f10f0f | 183 | |
63f10f0f | 184 | mutex_lock(&osc_lock); |
ab8e8957 | 185 | status = acpi_pci_query_osc(root, flags, NULL); |
63f10f0f KK |
186 | mutex_unlock(&osc_lock); |
187 | return status; | |
188 | } | |
189 | ||
76d56de5 | 190 | struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) |
63f10f0f KK |
191 | { |
192 | struct acpi_pci_root *root; | |
cd4faf9c | 193 | struct acpi_device *device; |
c1aec834 | 194 | |
cd4faf9c TI |
195 | if (acpi_bus_get_device(handle, &device) || |
196 | acpi_match_device_ids(device, root_device_ids)) | |
197 | return NULL; | |
198 | ||
199 | root = acpi_driver_data(device); | |
200 | ||
201 | return root; | |
63f10f0f | 202 | } |
76d56de5 | 203 | EXPORT_SYMBOL_GPL(acpi_pci_find_root); |
63f10f0f | 204 | |
2f7bbceb AC |
205 | struct acpi_handle_node { |
206 | struct list_head node; | |
207 | acpi_handle handle; | |
208 | }; | |
209 | ||
210 | /** | |
211 | * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev | |
212 | * @handle: the handle in question | |
213 | * | |
214 | * Given an ACPI CA handle, the desired PCI device is located in the | |
215 | * list of PCI devices. | |
216 | * | |
217 | * If the device is found, its reference count is increased and this | |
218 | * function returns a pointer to its data structure. The caller must | |
219 | * decrement the reference count by calling pci_dev_put(). | |
220 | * If no device is found, %NULL is returned. | |
221 | */ | |
222 | struct pci_dev *acpi_get_pci_dev(acpi_handle handle) | |
223 | { | |
224 | int dev, fn; | |
225 | unsigned long long adr; | |
226 | acpi_status status; | |
227 | acpi_handle phandle; | |
228 | struct pci_bus *pbus; | |
229 | struct pci_dev *pdev = NULL; | |
230 | struct acpi_handle_node *node, *tmp; | |
231 | struct acpi_pci_root *root; | |
232 | LIST_HEAD(device_list); | |
233 | ||
234 | /* | |
235 | * Walk up the ACPI CA namespace until we reach a PCI root bridge. | |
236 | */ | |
237 | phandle = handle; | |
238 | while (!acpi_is_root_bridge(phandle)) { | |
239 | node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); | |
240 | if (!node) | |
241 | goto out; | |
242 | ||
243 | INIT_LIST_HEAD(&node->node); | |
244 | node->handle = phandle; | |
245 | list_add(&node->node, &device_list); | |
246 | ||
247 | status = acpi_get_parent(phandle, &phandle); | |
248 | if (ACPI_FAILURE(status)) | |
249 | goto out; | |
250 | } | |
251 | ||
252 | root = acpi_pci_find_root(phandle); | |
253 | if (!root) | |
254 | goto out; | |
255 | ||
256 | pbus = root->bus; | |
257 | ||
258 | /* | |
259 | * Now, walk back down the PCI device tree until we return to our | |
260 | * original handle. Assumes that everything between the PCI root | |
261 | * bridge and the device we're looking for must be a P2P bridge. | |
262 | */ | |
263 | list_for_each_entry(node, &device_list, node) { | |
264 | acpi_handle hnd = node->handle; | |
265 | status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); | |
266 | if (ACPI_FAILURE(status)) | |
267 | goto out; | |
268 | dev = (adr >> 16) & 0xffff; | |
269 | fn = adr & 0xffff; | |
270 | ||
271 | pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); | |
412af978 | 272 | if (!pdev || hnd == handle) |
2f7bbceb AC |
273 | break; |
274 | ||
275 | pbus = pdev->subordinate; | |
276 | pci_dev_put(pdev); | |
497fb54f RW |
277 | |
278 | /* | |
279 | * This function may be called for a non-PCI device that has a | |
280 | * PCI parent (eg. a disk under a PCI SATA controller). In that | |
281 | * case pdev->subordinate will be NULL for the parent. | |
282 | */ | |
283 | if (!pbus) { | |
284 | dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); | |
285 | pdev = NULL; | |
286 | break; | |
287 | } | |
2f7bbceb AC |
288 | } |
289 | out: | |
290 | list_for_each_entry_safe(node, tmp, &device_list, node) | |
291 | kfree(node); | |
292 | ||
293 | return pdev; | |
294 | } | |
295 | EXPORT_SYMBOL_GPL(acpi_get_pci_dev); | |
296 | ||
63f10f0f | 297 | /** |
75fb60f2 RW |
298 | * acpi_pci_osc_control_set - Request control of PCI root _OSC features. |
299 | * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). | |
300 | * @mask: Mask of _OSC bits to request control of, place to store control mask. | |
301 | * @req: Mask of _OSC bits the control of is essential to the caller. | |
63f10f0f | 302 | * |
75fb60f2 RW |
303 | * Run _OSC query for @mask and if that is successful, compare the returned |
304 | * mask of control bits with @req. If all of the @req bits are set in the | |
305 | * returned mask, run _OSC request for it. | |
306 | * | |
307 | * The variable at the @mask address may be modified regardless of whether or | |
308 | * not the function returns success. On success it will contain the mask of | |
309 | * _OSC bits the BIOS has granted control of, but its contents are meaningless | |
310 | * on failure. | |
63f10f0f | 311 | **/ |
75fb60f2 | 312 | acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) |
63f10f0f | 313 | { |
75fb60f2 | 314 | struct acpi_pci_root *root; |
4ffe6e54 | 315 | acpi_status status = AE_OK; |
75fb60f2 | 316 | u32 ctrl, capbuf[3]; |
63f10f0f | 317 | |
75fb60f2 RW |
318 | if (!mask) |
319 | return AE_BAD_PARAMETER; | |
320 | ||
321 | ctrl = *mask & OSC_PCI_CONTROL_MASKS; | |
322 | if ((ctrl & req) != req) | |
63f10f0f KK |
323 | return AE_TYPE; |
324 | ||
325 | root = acpi_pci_find_root(handle); | |
326 | if (!root) | |
327 | return AE_NOT_EXIST; | |
328 | ||
329 | mutex_lock(&osc_lock); | |
75fb60f2 RW |
330 | |
331 | *mask = ctrl | root->osc_control_set; | |
63f10f0f | 332 | /* No need to evaluate _OSC if the control was already granted. */ |
75fb60f2 | 333 | if ((root->osc_control_set & ctrl) == ctrl) |
63f10f0f KK |
334 | goto out; |
335 | ||
75fb60f2 RW |
336 | /* Need to check the available controls bits before requesting them. */ |
337 | while (*mask) { | |
338 | status = acpi_pci_query_osc(root, root->osc_support_set, mask); | |
339 | if (ACPI_FAILURE(status)) | |
340 | goto out; | |
341 | if (ctrl == *mask) | |
342 | break; | |
343 | ctrl = *mask; | |
344 | } | |
2b8fd918 | 345 | |
75fb60f2 | 346 | if ((ctrl & req) != req) { |
63f10f0f KK |
347 | status = AE_SUPPORT; |
348 | goto out; | |
349 | } | |
350 | ||
b938a229 BH |
351 | capbuf[OSC_QUERY_DWORD] = 0; |
352 | capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; | |
353 | capbuf[OSC_CONTROL_DWORD] = ctrl; | |
75fb60f2 | 354 | status = acpi_pci_run_osc(handle, capbuf, mask); |
63f10f0f | 355 | if (ACPI_SUCCESS(status)) |
75fb60f2 | 356 | root->osc_control_set = *mask; |
63f10f0f KK |
357 | out: |
358 | mutex_unlock(&osc_lock); | |
359 | return status; | |
360 | } | |
9f5404d8 | 361 | EXPORT_SYMBOL(acpi_pci_osc_control_set); |
63f10f0f | 362 | |
3e43abb0 BH |
363 | static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, |
364 | int *clear_aspm) | |
1da177e4 | 365 | { |
b8eb67fc | 366 | u32 support, base_support, control; |
3e43abb0 BH |
367 | acpi_status status; |
368 | struct acpi_device *device = root->device; | |
bfe2414a | 369 | acpi_handle handle = device->handle; |
1da177e4 | 370 | |
2786f6e3 | 371 | /* |
990a7ac5 AP |
372 | * All supported architectures that use ACPI have support for |
373 | * PCI domains, so we indicate this in _OSC support capabilities. | |
2786f6e3 | 374 | */ |
b8eb67fc | 375 | support = base_support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; |
8c33f51d | 376 | if (pci_ext_cfg_avail()) |
b8eb67fc | 377 | support |= OSC_PCI_EXT_CONFIG_SUPPORT; |
1b2a7be6 | 378 | if (pcie_aspm_support_enabled()) |
b8eb67fc | 379 | support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; |
07ae95f9 | 380 | if (pci_msi_enabled()) |
b8eb67fc | 381 | support |= OSC_PCI_MSI_SUPPORT; |
1b2a7be6 BH |
382 | status = acpi_pci_osc_support(root, support); |
383 | if (ACPI_FAILURE(status)) { | |
384 | dev_info(&device->dev, "ACPI _OSC support " | |
385 | "notification failed, disabling PCIe ASPM\n"); | |
386 | *no_aspm = 1; | |
387 | support = base_support; | |
2d9c8677 | 388 | } |
b8178f13 | 389 | |
415e12b2 | 390 | if (!pcie_ports_disabled |
b8eb67fc BH |
391 | && (support & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) { |
392 | control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL | |
415e12b2 RW |
393 | | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL |
394 | | OSC_PCI_EXPRESS_PME_CONTROL; | |
395 | ||
396 | if (pci_aer_available()) { | |
397 | if (aer_acpi_firmware_first()) | |
8c33f51d | 398 | dev_dbg(&device->dev, |
415e12b2 RW |
399 | "PCIe errors handled by BIOS.\n"); |
400 | else | |
b8eb67fc | 401 | control |= OSC_PCI_EXPRESS_AER_CONTROL; |
415e12b2 RW |
402 | } |
403 | ||
8c33f51d | 404 | dev_info(&device->dev, |
b8eb67fc | 405 | "Requesting ACPI _OSC control (0x%02x)\n", control); |
415e12b2 | 406 | |
b8eb67fc | 407 | status = acpi_pci_osc_control_set(handle, &control, |
7dab9ef4 | 408 | OSC_PCI_EXPRESS_CAPABILITY_CONTROL); |
eca67315 | 409 | if (ACPI_SUCCESS(status)) { |
8c33f51d | 410 | dev_info(&device->dev, |
b8eb67fc BH |
411 | "ACPI _OSC control (0x%02x) granted\n", |
412 | control); | |
b8178f13 BH |
413 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
414 | /* | |
415 | * We have ASPM control, but the FADT indicates | |
416 | * that it's unsupported. Clear it. | |
417 | */ | |
3e43abb0 | 418 | *clear_aspm = 1; |
b8178f13 | 419 | } |
eca67315 | 420 | } else { |
8c33f51d | 421 | dev_info(&device->dev, |
a246670d RW |
422 | "ACPI _OSC request failed (%s), " |
423 | "returned control mask: 0x%02x\n", | |
b8eb67fc | 424 | acpi_format_exception(status), control); |
6dc7d22c JL |
425 | dev_info(&device->dev, |
426 | "ACPI _OSC control for PCIe not granted, disabling ASPM\n"); | |
3dc48af3 NH |
427 | /* |
428 | * We want to disable ASPM here, but aspm_disabled | |
429 | * needs to remain in its state from boot so that we | |
430 | * properly handle PCIe 1.1 devices. So we set this | |
431 | * flag here, to defer the action until after the ACPI | |
432 | * root scan. | |
433 | */ | |
3e43abb0 | 434 | *no_aspm = 1; |
eca67315 | 435 | } |
a246670d | 436 | } else { |
8c33f51d | 437 | dev_info(&device->dev, |
b8178f13 | 438 | "Unable to request _OSC control " |
b8eb67fc | 439 | "(_OSC support mask: 0x%02x)\n", support); |
415e12b2 | 440 | } |
3e43abb0 BH |
441 | } |
442 | ||
443 | static int acpi_pci_root_add(struct acpi_device *device, | |
444 | const struct acpi_device_id *not_used) | |
445 | { | |
446 | unsigned long long segment, bus; | |
447 | acpi_status status; | |
448 | int result; | |
449 | struct acpi_pci_root *root; | |
450 | acpi_handle handle = device->handle; | |
451 | int no_aspm = 0, clear_aspm = 0; | |
452 | ||
453 | root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); | |
454 | if (!root) | |
455 | return -ENOMEM; | |
456 | ||
457 | segment = 0; | |
458 | status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, | |
459 | &segment); | |
460 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
461 | dev_err(&device->dev, "can't evaluate _SEG\n"); | |
462 | result = -ENODEV; | |
463 | goto end; | |
464 | } | |
465 | ||
466 | /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ | |
467 | root->secondary.flags = IORESOURCE_BUS; | |
468 | status = try_get_root_bridge_busnr(handle, &root->secondary); | |
469 | if (ACPI_FAILURE(status)) { | |
470 | /* | |
471 | * We need both the start and end of the downstream bus range | |
472 | * to interpret _CBA (MMCONFIG base address), so it really is | |
473 | * supposed to be in _CRS. If we don't find it there, all we | |
474 | * can do is assume [_BBN-0xFF] or [0-0xFF]. | |
475 | */ | |
476 | root->secondary.end = 0xFF; | |
477 | dev_warn(&device->dev, | |
478 | FW_BUG "no secondary bus range in _CRS\n"); | |
479 | status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, | |
480 | NULL, &bus); | |
481 | if (ACPI_SUCCESS(status)) | |
482 | root->secondary.start = bus; | |
483 | else if (status == AE_NOT_FOUND) | |
484 | root->secondary.start = 0; | |
485 | else { | |
486 | dev_err(&device->dev, "can't evaluate _BBN\n"); | |
487 | result = -ENODEV; | |
488 | goto end; | |
489 | } | |
490 | } | |
491 | ||
492 | root->device = device; | |
493 | root->segment = segment & 0xFFFF; | |
494 | strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); | |
495 | strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); | |
496 | device->driver_data = root; | |
497 | ||
498 | pr_info(PREFIX "%s [%s] (domain %04x %pR)\n", | |
499 | acpi_device_name(device), acpi_device_bid(device), | |
500 | root->segment, &root->secondary); | |
501 | ||
502 | root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); | |
503 | ||
504 | negotiate_os_control(root, &no_aspm, &clear_aspm); | |
415e12b2 | 505 | |
3dc48af3 NH |
506 | /* |
507 | * TBD: Need PCI interface for enumeration/configuration of roots. | |
508 | */ | |
509 | ||
510 | /* | |
511 | * Scan the Root Bridge | |
512 | * -------------------- | |
513 | * Must do this prior to any attempt to bind the root device, as the | |
514 | * PCI namespace does not get created until this call is made (and | |
515 | * thus the root bridge's pci_dev does not exist). | |
516 | */ | |
517 | root->bus = pci_acpi_scan_root(root); | |
518 | if (!root->bus) { | |
519 | dev_err(&device->dev, | |
520 | "Bus %04x:%02x not present in PCI namespace\n", | |
521 | root->segment, (unsigned int)root->secondary.start); | |
522 | result = -ENODEV; | |
523 | goto end; | |
524 | } | |
525 | ||
526 | if (clear_aspm) { | |
527 | dev_info(&device->dev, "Disabling ASPM (FADT indicates it is unsupported)\n"); | |
528 | pcie_clear_aspm(root->bus); | |
529 | } | |
530 | if (no_aspm) | |
531 | pcie_no_aspm(); | |
532 | ||
b67ea761 RW |
533 | pci_acpi_add_bus_pm_notifier(device, root->bus); |
534 | if (device->wakeup.flags.run_wake) | |
535 | device_set_run_wake(root->bus->bridge, true); | |
536 | ||
3c449ed0 YL |
537 | if (system_state != SYSTEM_BOOTING) { |
538 | pcibios_resource_survey_bus(root->bus); | |
39772038 | 539 | pci_assign_unassigned_root_bus_resources(root->bus); |
516ca223 | 540 | } |
62a08c5a | 541 | |
caf420c6 | 542 | pci_bus_add_devices(root->bus); |
00c43b96 | 543 | return 1; |
47525cda | 544 | |
47525cda RW |
545 | end: |
546 | kfree(root); | |
547 | return result; | |
c431ada4 | 548 | } |
1da177e4 | 549 | |
00c43b96 | 550 | static void acpi_pci_root_remove(struct acpi_device *device) |
1da177e4 | 551 | { |
caf420c6 | 552 | struct acpi_pci_root *root = acpi_driver_data(device); |
c8e9afb1 | 553 | |
9738a1fd YL |
554 | pci_stop_root_bus(root->bus); |
555 | ||
b67ea761 RW |
556 | device_set_run_wake(root->bus->bridge, false); |
557 | pci_acpi_remove_bus_pm_notifier(device); | |
558 | ||
9738a1fd YL |
559 | pci_remove_root_bus(root->bus); |
560 | ||
1da177e4 | 561 | kfree(root); |
1da177e4 LT |
562 | } |
563 | ||
00c43b96 | 564 | void __init acpi_pci_root_init(void) |
1da177e4 | 565 | { |
d3072e6a RW |
566 | acpi_hest_init(); |
567 | ||
00c43b96 RW |
568 | if (!acpi_pci_disabled) { |
569 | pci_acpi_crs_quirks(); | |
570 | acpi_scan_add_handler(&pci_root_handler); | |
571 | } | |
1da177e4 | 572 | } |
668192b6 YL |
573 | /* Support root bridge hotplug */ |
574 | ||
575 | static void handle_root_bridge_insertion(acpi_handle handle) | |
576 | { | |
577 | struct acpi_device *device; | |
578 | ||
579 | if (!acpi_bus_get_device(handle, &device)) { | |
6dc7d22c JL |
580 | dev_printk(KERN_DEBUG, &device->dev, |
581 | "acpi device already exists; ignoring notify\n"); | |
668192b6 YL |
582 | return; |
583 | } | |
584 | ||
585 | if (acpi_bus_scan(handle)) | |
6dc7d22c | 586 | acpi_handle_err(handle, "cannot add bridge to acpi list\n"); |
668192b6 YL |
587 | } |
588 | ||
589 | static void handle_root_bridge_removal(struct acpi_device *device) | |
590 | { | |
b8b66110 | 591 | acpi_status status; |
668192b6 YL |
592 | struct acpi_eject_event *ej_event; |
593 | ||
594 | ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL); | |
595 | if (!ej_event) { | |
596 | /* Inform firmware the hot-remove operation has error */ | |
597 | (void) acpi_evaluate_hotplug_ost(device->handle, | |
598 | ACPI_NOTIFY_EJECT_REQUEST, | |
599 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, | |
600 | NULL); | |
601 | return; | |
602 | } | |
603 | ||
604 | ej_event->device = device; | |
605 | ej_event->event = ACPI_NOTIFY_EJECT_REQUEST; | |
606 | ||
b8b66110 YL |
607 | status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event); |
608 | if (ACPI_FAILURE(status)) | |
609 | kfree(ej_event); | |
668192b6 YL |
610 | } |
611 | ||
612 | static void _handle_hotplug_event_root(struct work_struct *work) | |
613 | { | |
614 | struct acpi_pci_root *root; | |
668192b6 YL |
615 | struct acpi_hp_work *hp_work; |
616 | acpi_handle handle; | |
617 | u32 type; | |
618 | ||
619 | hp_work = container_of(work, struct acpi_hp_work, work); | |
620 | handle = hp_work->handle; | |
621 | type = hp_work->type; | |
622 | ||
b8b66110 | 623 | acpi_scan_lock_acquire(); |
668192b6 | 624 | |
b8b66110 | 625 | root = acpi_pci_find_root(handle); |
668192b6 YL |
626 | |
627 | switch (type) { | |
628 | case ACPI_NOTIFY_BUS_CHECK: | |
629 | /* bus enumerate */ | |
6dc7d22c JL |
630 | acpi_handle_printk(KERN_DEBUG, handle, |
631 | "Bus check notify on %s\n", __func__); | |
3f327e39 YL |
632 | if (root) |
633 | acpiphp_check_host_bridge(handle); | |
634 | else | |
668192b6 YL |
635 | handle_root_bridge_insertion(handle); |
636 | ||
637 | break; | |
638 | ||
639 | case ACPI_NOTIFY_DEVICE_CHECK: | |
640 | /* device check */ | |
6dc7d22c JL |
641 | acpi_handle_printk(KERN_DEBUG, handle, |
642 | "Device check notify on %s\n", __func__); | |
668192b6 YL |
643 | if (!root) |
644 | handle_root_bridge_insertion(handle); | |
645 | break; | |
646 | ||
647 | case ACPI_NOTIFY_EJECT_REQUEST: | |
648 | /* request device eject */ | |
6dc7d22c JL |
649 | acpi_handle_printk(KERN_DEBUG, handle, |
650 | "Device eject notify on %s\n", __func__); | |
668192b6 YL |
651 | if (root) |
652 | handle_root_bridge_removal(root->device); | |
653 | break; | |
654 | default: | |
6dc7d22c JL |
655 | acpi_handle_warn(handle, |
656 | "notify_handler: unknown event type 0x%x\n", | |
657 | type); | |
668192b6 YL |
658 | break; |
659 | } | |
660 | ||
b8b66110 | 661 | acpi_scan_lock_release(); |
668192b6 | 662 | kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ |
668192b6 YL |
663 | } |
664 | ||
665 | static void handle_hotplug_event_root(acpi_handle handle, u32 type, | |
666 | void *context) | |
667 | { | |
668 | alloc_acpi_hp_work(handle, type, context, | |
669 | _handle_hotplug_event_root); | |
670 | } | |
671 | ||
672 | static acpi_status __init | |
673 | find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) | |
674 | { | |
121b090e | 675 | acpi_status status; |
668192b6 YL |
676 | int *count = (int *)context; |
677 | ||
678 | if (!acpi_is_root_bridge(handle)) | |
679 | return AE_OK; | |
680 | ||
681 | (*count)++; | |
682 | ||
121b090e TC |
683 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
684 | handle_hotplug_event_root, NULL); | |
685 | if (ACPI_FAILURE(status)) | |
6dc7d22c JL |
686 | acpi_handle_printk(KERN_DEBUG, handle, |
687 | "notify handler is not installed, exit status: %u\n", | |
688 | (unsigned int)status); | |
121b090e | 689 | else |
6dc7d22c JL |
690 | acpi_handle_printk(KERN_DEBUG, handle, |
691 | "notify handler is installed\n"); | |
668192b6 YL |
692 | |
693 | return AE_OK; | |
694 | } | |
695 | ||
696 | void __init acpi_pci_root_hp_init(void) | |
697 | { | |
698 | int num = 0; | |
699 | ||
700 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
701 | ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL); | |
702 | ||
703 | printk(KERN_DEBUG "Found %d acpi root devices\n", num); | |
704 | } |