Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * ACPI PCI HotPlug glue functions to ACPI CA subsystem | |
3 | * | |
4 | * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) | |
5 | * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) | |
6 | * Copyright (C) 2002,2003 NEC Corporation | |
42f49a6a RS |
7 | * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com) |
8 | * Copyright (C) 2003-2005 Hewlett Packard | |
8e7561cf RS |
9 | * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com) |
10 | * Copyright (C) 2005 Intel Corporation | |
1da177e4 LT |
11 | * |
12 | * All rights reserved. | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or (at | |
17 | * your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, but | |
20 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
22 | * NON INFRINGEMENT. See the GNU General Public License for more | |
23 | * details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
26 | * along with this program; if not, write to the Free Software | |
27 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
28 | * | |
998be20f | 29 | * Send feedback to <kristen.c.accardi@intel.com> |
1da177e4 LT |
30 | * |
31 | */ | |
32 | ||
42f49a6a RS |
33 | /* |
34 | * Lifetime rules for pci_dev: | |
42f49a6a RS |
35 | * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot() |
36 | * when the bridge is scanned and it loses a refcount when the bridge | |
37 | * is removed. | |
5d4a4b25 AC |
38 | * - When a P2P bridge is present, we elevate the refcount on the subordinate |
39 | * bus. It loses the refcount when the the driver unloads. | |
42f49a6a RS |
40 | */ |
41 | ||
1da177e4 LT |
42 | #include <linux/init.h> |
43 | #include <linux/module.h> | |
44 | ||
45 | #include <linux/kernel.h> | |
46 | #include <linux/pci.h> | |
7a54f25c | 47 | #include <linux/pci_hotplug.h> |
e8c331e9 | 48 | #include <linux/pci-acpi.h> |
4ebe3450 | 49 | #include <linux/pm_runtime.h> |
6aa4cdd0 | 50 | #include <linux/mutex.h> |
5a0e3ad6 | 51 | #include <linux/slab.h> |
6af8bef1 | 52 | #include <linux/acpi.h> |
1da177e4 LT |
53 | |
54 | #include "../pci.h" | |
1da177e4 LT |
55 | #include "acpiphp.h" |
56 | ||
57 | static LIST_HEAD(bridge_list); | |
3d54a316 | 58 | static DEFINE_MUTEX(bridge_mutex); |
cb7b8ced | 59 | static DEFINE_MUTEX(acpiphp_context_lock); |
1da177e4 LT |
60 | |
61 | #define MY_NAME "acpiphp_glue" | |
62 | ||
87831273 | 63 | static void handle_hotplug_event(acpi_handle handle, u32 type, void *data); |
8e5dce35 | 64 | static void acpiphp_sanitize_bus(struct pci_bus *bus); |
fca6825a | 65 | static void acpiphp_set_hpp_values(struct pci_bus *bus); |
43e5c091 | 66 | static void hotplug_event(acpi_handle handle, u32 type, void *data); |
3d54a316 | 67 | static void free_bridge(struct kref *kref); |
8e5dce35 | 68 | |
cb7b8ced RW |
69 | static void acpiphp_context_handler(acpi_handle handle, void *context) |
70 | { | |
71 | /* Intentionally empty. */ | |
72 | } | |
73 | ||
74 | /** | |
75 | * acpiphp_init_context - Create hotplug context and grab a reference to it. | |
76 | * @handle: ACPI object handle to create the context for. | |
77 | * | |
78 | * Call under acpiphp_context_lock. | |
79 | */ | |
80 | static struct acpiphp_context *acpiphp_init_context(acpi_handle handle) | |
81 | { | |
82 | struct acpiphp_context *context; | |
83 | acpi_status status; | |
84 | ||
85 | context = kzalloc(sizeof(*context), GFP_KERNEL); | |
86 | if (!context) | |
87 | return NULL; | |
88 | ||
89 | context->handle = handle; | |
90 | context->refcount = 1; | |
91 | status = acpi_attach_data(handle, acpiphp_context_handler, context); | |
92 | if (ACPI_FAILURE(status)) { | |
93 | kfree(context); | |
94 | return NULL; | |
95 | } | |
96 | return context; | |
97 | } | |
98 | ||
99 | /** | |
100 | * acpiphp_get_context - Get hotplug context and grab a reference to it. | |
101 | * @handle: ACPI object handle to get the context for. | |
102 | * | |
103 | * Call under acpiphp_context_lock. | |
104 | */ | |
105 | static struct acpiphp_context *acpiphp_get_context(acpi_handle handle) | |
106 | { | |
107 | struct acpiphp_context *context = NULL; | |
108 | acpi_status status; | |
109 | void *data; | |
110 | ||
111 | status = acpi_get_data(handle, acpiphp_context_handler, &data); | |
112 | if (ACPI_SUCCESS(status)) { | |
113 | context = data; | |
114 | context->refcount++; | |
115 | } | |
116 | return context; | |
117 | } | |
118 | ||
119 | /** | |
120 | * acpiphp_put_context - Drop a reference to ACPI hotplug context. | |
121 | * @handle: ACPI object handle to put the context for. | |
122 | * | |
123 | * The context object is removed if there are no more references to it. | |
124 | * | |
125 | * Call under acpiphp_context_lock. | |
126 | */ | |
127 | static void acpiphp_put_context(struct acpiphp_context *context) | |
128 | { | |
129 | if (--context->refcount) | |
130 | return; | |
131 | ||
bd4674df | 132 | WARN_ON(context->bridge); |
cb7b8ced RW |
133 | acpi_detach_data(context->handle, acpiphp_context_handler); |
134 | kfree(context); | |
135 | } | |
136 | ||
3d54a316 JL |
137 | static inline void get_bridge(struct acpiphp_bridge *bridge) |
138 | { | |
139 | kref_get(&bridge->ref); | |
140 | } | |
141 | ||
142 | static inline void put_bridge(struct acpiphp_bridge *bridge) | |
143 | { | |
144 | kref_put(&bridge->ref, free_bridge); | |
145 | } | |
146 | ||
147 | static void free_bridge(struct kref *kref) | |
148 | { | |
cb7b8ced | 149 | struct acpiphp_context *context; |
3d54a316 JL |
150 | struct acpiphp_bridge *bridge; |
151 | struct acpiphp_slot *slot, *next; | |
152 | struct acpiphp_func *func, *tmp; | |
153 | ||
cb7b8ced RW |
154 | mutex_lock(&acpiphp_context_lock); |
155 | ||
3d54a316 JL |
156 | bridge = container_of(kref, struct acpiphp_bridge, ref); |
157 | ||
158 | list_for_each_entry_safe(slot, next, &bridge->slots, node) { | |
bd4674df RW |
159 | list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) |
160 | acpiphp_put_context(func_to_context(func)); | |
161 | ||
3d54a316 JL |
162 | kfree(slot); |
163 | } | |
164 | ||
87831273 | 165 | context = bridge->context; |
bbd34fcd RW |
166 | /* Root bridges will not have hotplug context. */ |
167 | if (context) { | |
168 | /* Release the reference taken by acpiphp_enumerate_slots(). */ | |
bda46dbb | 169 | put_bridge(context->func.parent); |
bbd34fcd RW |
170 | context->bridge = NULL; |
171 | acpiphp_put_context(context); | |
172 | } | |
cb7b8ced | 173 | |
3d54a316 JL |
174 | put_device(&bridge->pci_bus->dev); |
175 | pci_dev_put(bridge->pci_dev); | |
176 | kfree(bridge); | |
cb7b8ced RW |
177 | |
178 | mutex_unlock(&acpiphp_context_lock); | |
3d54a316 JL |
179 | } |
180 | ||
4e8662bb KA |
181 | /* |
182 | * the _DCK method can do funny things... and sometimes not | |
183 | * hah-hah funny. | |
184 | * | |
185 | * TBD - figure out a way to only call fixups for | |
186 | * systems that require them. | |
187 | */ | |
f09ce741 | 188 | static void post_dock_fixups(acpi_handle not_used, u32 event, void *data) |
4e8662bb | 189 | { |
43e5c091 | 190 | struct acpiphp_context *context = data; |
bda46dbb | 191 | struct pci_bus *bus = context->func.slot->bus; |
4e8662bb KA |
192 | u32 buses; |
193 | ||
194 | if (!bus->self) | |
f09ce741 | 195 | return; |
4e8662bb KA |
196 | |
197 | /* fixup bad _DCK function that rewrites | |
198 | * secondary bridge on slot | |
199 | */ | |
200 | pci_read_config_dword(bus->self, | |
201 | PCI_PRIMARY_BUS, | |
202 | &buses); | |
203 | ||
b918c62e | 204 | if (((buses >> 8) & 0xff) != bus->busn_res.start) { |
4e8662bb | 205 | buses = (buses & 0xff000000) |
2a9d3521 | 206 | | ((unsigned int)(bus->primary) << 0) |
b918c62e YL |
207 | | ((unsigned int)(bus->busn_res.start) << 8) |
208 | | ((unsigned int)(bus->busn_res.end) << 16); | |
4e8662bb KA |
209 | pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); |
210 | } | |
4e8662bb KA |
211 | } |
212 | ||
213 | ||
9c8b04be | 214 | static const struct acpi_dock_ops acpiphp_dock_ops = { |
f09ce741 | 215 | .fixup = post_dock_fixups, |
43e5c091 | 216 | .handler = hotplug_event, |
1253f7aa | 217 | }; |
1da177e4 | 218 | |
5ba113f7 JL |
219 | /* Check whether the PCI device is managed by native PCIe hotplug driver */ |
220 | static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev) | |
221 | { | |
222 | u32 reg32; | |
223 | acpi_handle tmp; | |
224 | struct acpi_pci_root *root; | |
225 | ||
226 | /* Check whether the PCIe port supports native PCIe hotplug */ | |
227 | if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32)) | |
228 | return false; | |
229 | if (!(reg32 & PCI_EXP_SLTCAP_HPC)) | |
230 | return false; | |
231 | ||
232 | /* | |
233 | * Check whether native PCIe hotplug has been enabled for | |
234 | * this PCIe hierarchy. | |
235 | */ | |
236 | tmp = acpi_find_root_bridge_handle(pdev); | |
237 | if (!tmp) | |
238 | return false; | |
239 | root = acpi_pci_find_root(tmp); | |
240 | if (!root) | |
241 | return false; | |
242 | if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) | |
243 | return false; | |
244 | ||
245 | return true; | |
246 | } | |
247 | ||
21a31013 RW |
248 | static void acpiphp_dock_init(void *data) |
249 | { | |
43e5c091 | 250 | struct acpiphp_context *context = data; |
21a31013 | 251 | |
bda46dbb | 252 | get_bridge(context->func.parent); |
21a31013 RW |
253 | } |
254 | ||
255 | static void acpiphp_dock_release(void *data) | |
256 | { | |
43e5c091 | 257 | struct acpiphp_context *context = data; |
21a31013 | 258 | |
bda46dbb | 259 | put_bridge(context->func.parent); |
21a31013 RW |
260 | } |
261 | ||
1da177e4 | 262 | /* callback routine to register each ACPI PCI slot object */ |
cb7b8ced RW |
263 | static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data, |
264 | void **rv) | |
1da177e4 | 265 | { |
cb7b8ced RW |
266 | struct acpiphp_bridge *bridge = data; |
267 | struct acpiphp_context *context; | |
1da177e4 LT |
268 | struct acpiphp_slot *slot; |
269 | struct acpiphp_func *newfunc; | |
1da177e4 | 270 | acpi_status status = AE_OK; |
bbd34fcd RW |
271 | unsigned long long adr; |
272 | int device, function; | |
e8c331e9 | 273 | struct pci_bus *pbus = bridge->pci_bus; |
bbd34fcd | 274 | struct pci_dev *pdev = bridge->pci_dev; |
3b63aaa7 | 275 | u32 val; |
1da177e4 | 276 | |
bbd34fcd | 277 | if (pdev && device_is_managed_by_native_pciehp(pdev)) |
1da177e4 LT |
278 | return AE_OK; |
279 | ||
dfb117b3 BH |
280 | status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); |
281 | if (ACPI_FAILURE(status)) { | |
bbd34fcd | 282 | acpi_handle_warn(handle, "can't evaluate _ADR (%#x)\n", status); |
dfb117b3 BH |
283 | return AE_OK; |
284 | } | |
285 | ||
286 | device = (adr >> 16) & 0xffff; | |
287 | function = adr & 0xffff; | |
288 | ||
cb7b8ced RW |
289 | mutex_lock(&acpiphp_context_lock); |
290 | context = acpiphp_init_context(handle); | |
291 | if (!context) { | |
292 | mutex_unlock(&acpiphp_context_lock); | |
293 | acpi_handle_err(handle, "No hotplug context\n"); | |
cb7b8ced RW |
294 | return AE_NOT_EXIST; |
295 | } | |
bd4674df | 296 | newfunc = &context->func; |
bd4674df | 297 | newfunc->function = function; |
bda46dbb | 298 | newfunc->parent = bridge; |
cb7b8ced RW |
299 | mutex_unlock(&acpiphp_context_lock); |
300 | ||
ecd046da | 301 | if (acpi_has_method(handle, "_EJ0")) |
20416ea5 | 302 | newfunc->flags = FUNC_HAS_EJ0; |
1da177e4 | 303 | |
ecd046da | 304 | if (acpi_has_method(handle, "_STA")) |
1da177e4 LT |
305 | newfunc->flags |= FUNC_HAS_STA; |
306 | ||
ecd046da | 307 | if (acpi_has_method(handle, "_DCK")) |
20416ea5 | 308 | newfunc->flags |= FUNC_HAS_DCK; |
20416ea5 | 309 | |
1da177e4 | 310 | /* search for objects that share the same slot */ |
ad41dd9d | 311 | list_for_each_entry(slot, &bridge->slots, node) |
bbd34fcd | 312 | if (slot->device == device) |
ac372338 | 313 | goto slot_found; |
1da177e4 | 314 | |
ac372338 RW |
315 | slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); |
316 | if (!slot) { | |
317 | status = AE_NO_MEMORY; | |
318 | goto err; | |
319 | } | |
320 | ||
bda46dbb | 321 | slot->bus = bridge->pci_bus; |
ac372338 | 322 | slot->device = device; |
ac372338 RW |
323 | INIT_LIST_HEAD(&slot->funcs); |
324 | mutex_init(&slot->crit_sect); | |
325 | ||
ac372338 | 326 | list_add_tail(&slot->node, &bridge->slots); |
1da177e4 | 327 | |
bbd34fcd RW |
328 | /* Register slots for ejectable funtions only. */ |
329 | if (acpi_pci_check_ejectable(pbus, handle) || is_dock_device(handle)) { | |
330 | unsigned long long sun; | |
331 | int retval; | |
ac372338 | 332 | |
bbd34fcd RW |
333 | bridge->nr_slots++; |
334 | status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); | |
335 | if (ACPI_FAILURE(status)) | |
336 | sun = bridge->nr_slots; | |
337 | ||
bbd34fcd | 338 | dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", |
7342798d | 339 | sun, pci_domain_nr(pbus), pbus->number, device); |
bbd34fcd | 340 | |
7342798d | 341 | retval = acpiphp_register_hotplug_slot(slot, sun); |
bbd34fcd | 342 | if (retval) { |
1aaac071 | 343 | slot->slot = NULL; |
bbd34fcd RW |
344 | bridge->nr_slots--; |
345 | if (retval == -EBUSY) | |
346 | warn("Slot %llu already registered by another " | |
7342798d | 347 | "hotplug driver\n", sun); |
bbd34fcd RW |
348 | else |
349 | warn("acpiphp_register_hotplug_slot failed " | |
350 | "(err code = 0x%x)\n", retval); | |
351 | } | |
352 | /* Even if the slot registration fails, we can still use it. */ | |
1da177e4 LT |
353 | } |
354 | ||
ac372338 | 355 | slot_found: |
1da177e4 LT |
356 | newfunc->slot = slot; |
357 | list_add_tail(&newfunc->sibling, &slot->funcs); | |
358 | ||
3b63aaa7 JL |
359 | if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), |
360 | &val, 60*1000)) | |
bc805a55 | 361 | slot->flags |= SLOT_ENABLED; |
1da177e4 | 362 | |
4e8662bb KA |
363 | if (is_dock_device(handle)) { |
364 | /* we don't want to call this device's _EJ0 | |
365 | * because we want the dock notify handler | |
366 | * to call it after it calls _DCK | |
20416ea5 KA |
367 | */ |
368 | newfunc->flags &= ~FUNC_HAS_EJ0; | |
4e8662bb | 369 | if (register_hotplug_dock_device(handle, |
43e5c091 | 370 | &acpiphp_dock_ops, context, |
21a31013 | 371 | acpiphp_dock_init, acpiphp_dock_release)) |
4e8662bb | 372 | dbg("failed to register dock device\n"); |
20416ea5 KA |
373 | } |
374 | ||
1da177e4 | 375 | /* install notify handler */ |
20416ea5 | 376 | if (!(newfunc->flags & FUNC_HAS_DCK)) { |
87831273 RW |
377 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
378 | handle_hotplug_event, | |
379 | context); | |
bbd34fcd RW |
380 | if (ACPI_FAILURE(status)) |
381 | acpi_handle_err(handle, | |
382 | "failed to install notify handler\n"); | |
2e862c51 | 383 | } |
1da177e4 | 384 | |
2e862c51 | 385 | return AE_OK; |
e27da381 | 386 | |
cb7b8ced | 387 | err: |
cb7b8ced | 388 | mutex_lock(&acpiphp_context_lock); |
cb7b8ced RW |
389 | acpiphp_put_context(context); |
390 | mutex_unlock(&acpiphp_context_lock); | |
cb7b8ced | 391 | return status; |
1da177e4 LT |
392 | } |
393 | ||
42f49a6a RS |
394 | static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) |
395 | { | |
ed13febf RW |
396 | struct acpiphp_context *context; |
397 | struct acpiphp_bridge *bridge = NULL; | |
58c08628 | 398 | |
ed13febf RW |
399 | mutex_lock(&acpiphp_context_lock); |
400 | context = acpiphp_get_context(handle); | |
401 | if (context) { | |
402 | bridge = context->bridge; | |
403 | if (bridge) | |
3d54a316 | 404 | get_bridge(bridge); |
42f49a6a | 405 | |
ed13febf RW |
406 | acpiphp_put_context(context); |
407 | } | |
408 | mutex_unlock(&acpiphp_context_lock); | |
409 | return bridge; | |
42f49a6a | 410 | } |
1da177e4 | 411 | |
364d5094 | 412 | static void cleanup_bridge(struct acpiphp_bridge *bridge) |
1da177e4 | 413 | { |
3d54a316 JL |
414 | struct acpiphp_slot *slot; |
415 | struct acpiphp_func *func; | |
42f49a6a | 416 | acpi_status status; |
42f49a6a | 417 | |
3d54a316 JL |
418 | list_for_each_entry(slot, &bridge->slots, node) { |
419 | list_for_each_entry(func, &slot->funcs, sibling) { | |
5a3bc573 RW |
420 | acpi_handle handle = func_to_handle(func); |
421 | ||
422 | if (is_dock_device(handle)) | |
423 | unregister_hotplug_dock_device(handle); | |
424 | ||
20416ea5 | 425 | if (!(func->flags & FUNC_HAS_DCK)) { |
5a3bc573 | 426 | status = acpi_remove_notify_handler(handle, |
87831273 RW |
427 | ACPI_SYSTEM_NOTIFY, |
428 | handle_hotplug_event); | |
20416ea5 KA |
429 | if (ACPI_FAILURE(status)) |
430 | err("failed to remove notify handler\n"); | |
431 | } | |
42f49a6a | 432 | } |
1aaac071 RW |
433 | if (slot->slot) |
434 | acpiphp_unregister_hotplug_slot(slot); | |
42f49a6a RS |
435 | } |
436 | ||
3d54a316 | 437 | mutex_lock(&bridge_mutex); |
42f49a6a | 438 | list_del(&bridge->list); |
3d54a316 | 439 | mutex_unlock(&bridge_mutex); |
1da177e4 LT |
440 | } |
441 | ||
15a1ae74 | 442 | /** |
26e6c66e | 443 | * acpiphp_max_busnr - return the highest reserved bus number under the given bus. |
15a1ae74 | 444 | * @bus: bus to start search with |
15a1ae74 KA |
445 | */ |
446 | static unsigned char acpiphp_max_busnr(struct pci_bus *bus) | |
447 | { | |
448 | struct list_head *tmp; | |
449 | unsigned char max, n; | |
450 | ||
451 | /* | |
452 | * pci_bus_max_busnr will return the highest | |
453 | * reserved busnr for all these children. | |
454 | * that is equivalent to the bus->subordinate | |
455 | * value. We don't want to use the parent's | |
456 | * bus->subordinate value because it could have | |
457 | * padding in it. | |
458 | */ | |
b918c62e | 459 | max = bus->busn_res.start; |
15a1ae74 KA |
460 | |
461 | list_for_each(tmp, &bus->children) { | |
462 | n = pci_bus_max_busnr(pci_bus_b(tmp)); | |
463 | if (n > max) | |
464 | max = n; | |
465 | } | |
466 | return max; | |
467 | } | |
468 | ||
15a1ae74 | 469 | /** |
236e2624 RW |
470 | * acpiphp_bus_trim - Trim device objects in an ACPI namespace subtree. |
471 | * @handle: ACPI device object handle to start from. | |
15a1ae74 | 472 | */ |
236e2624 | 473 | static void acpiphp_bus_trim(acpi_handle handle) |
15a1ae74 | 474 | { |
236e2624 | 475 | struct acpi_device *adev = NULL; |
15a1ae74 | 476 | |
236e2624 RW |
477 | acpi_bus_get_device(handle, &adev); |
478 | if (adev) | |
479 | acpi_bus_trim(adev); | |
15a1ae74 KA |
480 | } |
481 | ||
92c9be95 | 482 | /** |
236e2624 RW |
483 | * acpiphp_bus_add - Scan ACPI namespace subtree. |
484 | * @handle: ACPI object handle to start the scan from. | |
92c9be95 | 485 | */ |
236e2624 | 486 | static void acpiphp_bus_add(acpi_handle handle) |
92c9be95 | 487 | { |
bc805a55 RW |
488 | struct acpi_device *adev = NULL; |
489 | ||
236e2624 | 490 | acpi_bus_scan(handle); |
bc805a55 RW |
491 | acpi_bus_get_device(handle, &adev); |
492 | if (adev) | |
493 | acpi_device_set_power(adev, ACPI_STATE_D0); | |
92c9be95 | 494 | } |
15a1ae74 | 495 | |
d0607050 SL |
496 | static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) |
497 | { | |
498 | struct acpiphp_func *func; | |
499 | union acpi_object params[2]; | |
500 | struct acpi_object_list arg_list; | |
501 | ||
502 | list_for_each_entry(func, &slot->funcs, sibling) { | |
503 | arg_list.count = 2; | |
504 | arg_list.pointer = params; | |
505 | params[0].type = ACPI_TYPE_INTEGER; | |
506 | params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; | |
507 | params[1].type = ACPI_TYPE_INTEGER; | |
508 | params[1].integer.value = 1; | |
509 | /* _REG is optional, we don't care about if there is failure */ | |
5a3bc573 RW |
510 | acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list, |
511 | NULL); | |
d0607050 SL |
512 | } |
513 | } | |
514 | ||
1f96a965 YL |
515 | static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) |
516 | { | |
517 | struct acpiphp_func *func; | |
518 | ||
1f96a965 YL |
519 | /* quirk, or pcie could set it already */ |
520 | if (dev->is_hotplug_bridge) | |
521 | return; | |
522 | ||
1f96a965 YL |
523 | list_for_each_entry(func, &slot->funcs, sibling) { |
524 | if (PCI_FUNC(dev->devfn) == func->function) { | |
bbd34fcd | 525 | dev->is_hotplug_bridge = 1; |
1f96a965 YL |
526 | break; |
527 | } | |
528 | } | |
529 | } | |
3b63aaa7 | 530 | |
a47d8c8e RW |
531 | static int acpiphp_rescan_slot(struct acpiphp_slot *slot) |
532 | { | |
533 | struct acpiphp_func *func; | |
534 | ||
535 | list_for_each_entry(func, &slot->funcs, sibling) | |
536 | acpiphp_bus_add(func_to_handle(func)); | |
537 | ||
538 | return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0)); | |
539 | } | |
540 | ||
1da177e4 | 541 | /** |
a1d0abce | 542 | * enable_slot - enable, configure a slot |
1da177e4 LT |
543 | * @slot: slot to be enabled |
544 | * | |
545 | * This function should be called per *physical slot*, | |
546 | * not per each slot object in ACPI namespace. | |
1da177e4 | 547 | */ |
a1d0abce | 548 | static void __ref enable_slot(struct acpiphp_slot *slot) |
1da177e4 | 549 | { |
1da177e4 | 550 | struct pci_dev *dev; |
bda46dbb | 551 | struct pci_bus *bus = slot->bus; |
1da177e4 | 552 | struct acpiphp_func *func; |
b91182a6 | 553 | int max, pass; |
d66ecb72 | 554 | LIST_HEAD(add_list); |
2dc41281 | 555 | int nr_found; |
1da177e4 | 556 | |
a47d8c8e | 557 | nr_found = acpiphp_rescan_slot(slot); |
15a1ae74 | 558 | max = acpiphp_max_busnr(bus); |
42f49a6a RS |
559 | for (pass = 0; pass < 2; pass++) { |
560 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
561 | if (PCI_SLOT(dev->devfn) != slot->device) | |
562 | continue; | |
a1d0abce | 563 | |
42f49a6a | 564 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || |
c64b5eea | 565 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { |
42f49a6a | 566 | max = pci_scan_bridge(bus, dev, max, pass); |
1f96a965 YL |
567 | if (pass && dev->subordinate) { |
568 | check_hotplug_bridge(slot, dev); | |
d66ecb72 JL |
569 | pcibios_resource_survey_bus(dev->subordinate); |
570 | __pci_bus_size_bridges(dev->subordinate, | |
571 | &add_list); | |
1f96a965 | 572 | } |
c64b5eea | 573 | } |
42f49a6a | 574 | } |
1da177e4 | 575 | } |
d66ecb72 | 576 | __pci_bus_assign_resources(bus, &add_list, NULL); |
2dc41281 RW |
577 | /* Nothing more to do here if there are no new devices on this bus. */ |
578 | if (!nr_found && (slot->flags & SLOT_ENABLED)) | |
579 | return; | |
580 | ||
8e5dce35 | 581 | acpiphp_sanitize_bus(bus); |
fca6825a | 582 | acpiphp_set_hpp_values(bus); |
d0607050 | 583 | acpiphp_set_acpi_region(slot); |
69643e48 IC |
584 | |
585 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
586 | /* Assume that newly added devices are powered on already. */ | |
587 | if (!dev->is_added) | |
588 | dev->current_state = PCI_D0; | |
589 | } | |
590 | ||
42f49a6a RS |
591 | pci_bus_add_devices(bus); |
592 | ||
f382a086 | 593 | slot->flags |= SLOT_ENABLED; |
58c08628 | 594 | list_for_each_entry(func, &slot->funcs, sibling) { |
9d911d79 AC |
595 | dev = pci_get_slot(bus, PCI_DEVFN(slot->device, |
596 | func->function)); | |
f382a086 AK |
597 | if (!dev) { |
598 | /* Do not set SLOT_ENABLED flag if some funcs | |
599 | are not added. */ | |
600 | slot->flags &= (~SLOT_ENABLED); | |
551bcb75 | 601 | continue; |
f382a086 | 602 | } |
1da177e4 | 603 | } |
1da177e4 LT |
604 | } |
605 | ||
ce29ca3e AK |
606 | /* return first device in slot, acquiring a reference on it */ |
607 | static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot) | |
608 | { | |
bda46dbb | 609 | struct pci_bus *bus = slot->bus; |
ce29ca3e AK |
610 | struct pci_dev *dev; |
611 | struct pci_dev *ret = NULL; | |
612 | ||
613 | down_read(&pci_bus_sem); | |
614 | list_for_each_entry(dev, &bus->devices, bus_list) | |
615 | if (PCI_SLOT(dev->devfn) == slot->device) { | |
616 | ret = pci_dev_get(dev); | |
617 | break; | |
618 | } | |
619 | up_read(&pci_bus_sem); | |
620 | ||
621 | return ret; | |
622 | } | |
623 | ||
1da177e4 | 624 | /** |
a1d0abce | 625 | * disable_slot - disable a slot |
26e6c66e | 626 | * @slot: ACPI PHP slot |
1da177e4 | 627 | */ |
a1d0abce | 628 | static void disable_slot(struct acpiphp_slot *slot) |
1da177e4 | 629 | { |
1da177e4 | 630 | struct acpiphp_func *func; |
9d911d79 | 631 | struct pci_dev *pdev; |
551bcb75 | 632 | |
ce29ca3e | 633 | /* |
a1d0abce | 634 | * enable_slot() enumerates all functions in this device via |
ce29ca3e AK |
635 | * pci_scan_slot(), whether they have associated ACPI hotplug |
636 | * methods (_EJ0, etc.) or not. Therefore, we remove all functions | |
637 | * here. | |
638 | */ | |
639 | while ((pdev = dev_in_slot(slot))) { | |
34e54843 | 640 | pci_stop_and_remove_bus_device(pdev); |
ce29ca3e | 641 | pci_dev_put(pdev); |
600812ec ST |
642 | } |
643 | ||
5a3bc573 RW |
644 | list_for_each_entry(func, &slot->funcs, sibling) |
645 | acpiphp_bus_trim(func_to_handle(func)); | |
1da177e4 LT |
646 | |
647 | slot->flags &= (~SLOT_ENABLED); | |
1da177e4 LT |
648 | } |
649 | ||
650 | ||
651 | /** | |
652 | * get_slot_status - get ACPI slot status | |
26e6c66e | 653 | * @slot: ACPI PHP slot |
1da177e4 | 654 | * |
26e6c66e RD |
655 | * If a slot has _STA for each function and if any one of them |
656 | * returned non-zero status, return it. | |
1da177e4 | 657 | * |
26e6c66e RD |
658 | * If a slot doesn't have _STA and if any one of its functions' |
659 | * configuration space is configured, return 0x0f as a _STA. | |
1da177e4 | 660 | * |
26e6c66e | 661 | * Otherwise return 0. |
1da177e4 LT |
662 | */ |
663 | static unsigned int get_slot_status(struct acpiphp_slot *slot) | |
664 | { | |
27663c58 | 665 | unsigned long long sta = 0; |
1da177e4 LT |
666 | struct acpiphp_func *func; |
667 | ||
58c08628 | 668 | list_for_each_entry(func, &slot->funcs, sibling) { |
1da177e4 | 669 | if (func->flags & FUNC_HAS_STA) { |
5a3bc573 RW |
670 | acpi_status status; |
671 | ||
672 | status = acpi_evaluate_integer(func_to_handle(func), | |
673 | "_STA", NULL, &sta); | |
1da177e4 LT |
674 | if (ACPI_SUCCESS(status) && sta) |
675 | break; | |
676 | } else { | |
5a3bc573 RW |
677 | u32 dvid; |
678 | ||
bda46dbb | 679 | pci_bus_read_config_dword(slot->bus, |
1da177e4 LT |
680 | PCI_DEVFN(slot->device, |
681 | func->function), | |
682 | PCI_VENDOR_ID, &dvid); | |
683 | if (dvid != 0xffffffff) { | |
684 | sta = ACPI_STA_ALL; | |
685 | break; | |
686 | } | |
687 | } | |
688 | } | |
689 | ||
690 | return (unsigned int)sta; | |
691 | } | |
692 | ||
4ebe3450 RW |
693 | /** |
694 | * trim_stale_devices - remove PCI devices that are not responding. | |
695 | * @dev: PCI device to start walking the hierarchy from. | |
696 | */ | |
697 | static void trim_stale_devices(struct pci_dev *dev) | |
698 | { | |
699 | acpi_handle handle = ACPI_HANDLE(&dev->dev); | |
700 | struct pci_bus *bus = dev->subordinate; | |
701 | bool alive = false; | |
702 | ||
703 | if (handle) { | |
704 | acpi_status status; | |
705 | unsigned long long sta; | |
706 | ||
707 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
708 | alive = ACPI_SUCCESS(status) && sta == ACPI_STA_ALL; | |
709 | } | |
710 | if (!alive) { | |
711 | u32 v; | |
712 | ||
713 | /* Check if the device responds. */ | |
714 | alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0); | |
715 | } | |
716 | if (!alive) { | |
717 | pci_stop_and_remove_bus_device(dev); | |
718 | if (handle) | |
719 | acpiphp_bus_trim(handle); | |
720 | } else if (bus) { | |
721 | struct pci_dev *child, *tmp; | |
722 | ||
723 | /* The device is a bridge. so check the bus below it. */ | |
724 | pm_runtime_get_sync(&dev->dev); | |
725 | list_for_each_entry_safe(child, tmp, &bus->devices, bus_list) | |
726 | trim_stale_devices(child); | |
727 | ||
728 | pm_runtime_put(&dev->dev); | |
729 | } | |
730 | } | |
731 | ||
1da177e4 LT |
732 | /** |
733 | * acpiphp_check_bridge - re-enumerate devices | |
26e6c66e | 734 | * @bridge: where to begin re-enumeration |
1da177e4 LT |
735 | * |
736 | * Iterate over all slots under this bridge and make sure that if a | |
737 | * card is present they are enabled, and if not they are disabled. | |
738 | */ | |
4ebe3450 | 739 | static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) |
1da177e4 LT |
740 | { |
741 | struct acpiphp_slot *slot; | |
1da177e4 | 742 | |
ad41dd9d | 743 | list_for_each_entry(slot, &bridge->slots, node) { |
4ebe3450 RW |
744 | struct pci_bus *bus = slot->bus; |
745 | struct pci_dev *dev, *tmp; | |
746 | ||
747 | mutex_lock(&slot->crit_sect); | |
748 | /* wake up all functions */ | |
749 | if (get_slot_status(slot) == ACPI_STA_ALL) { | |
750 | /* remove stale devices if any */ | |
751 | list_for_each_entry_safe(dev, tmp, &bus->devices, | |
752 | bus_list) | |
753 | if (PCI_SLOT(dev->devfn) == slot->device) | |
754 | trim_stale_devices(dev); | |
755 | ||
756 | /* configure all functions */ | |
a1d0abce | 757 | enable_slot(slot); |
1da177e4 | 758 | } else { |
a1d0abce | 759 | disable_slot(slot); |
1da177e4 | 760 | } |
4ebe3450 | 761 | mutex_unlock(&slot->crit_sect); |
1da177e4 | 762 | } |
1da177e4 LT |
763 | } |
764 | ||
fca6825a | 765 | static void acpiphp_set_hpp_values(struct pci_bus *bus) |
8e7561cf | 766 | { |
8e7561cf RS |
767 | struct pci_dev *dev; |
768 | ||
e81995bb BH |
769 | list_for_each_entry(dev, &bus->devices, bus_list) |
770 | pci_configure_slot(dev); | |
8e7561cf RS |
771 | } |
772 | ||
773 | /* | |
774 | * Remove devices for which we could not assign resources, call | |
775 | * arch specific code to fix-up the bus | |
776 | */ | |
777 | static void acpiphp_sanitize_bus(struct pci_bus *bus) | |
778 | { | |
d65eba6a | 779 | struct pci_dev *dev, *tmp; |
8e7561cf RS |
780 | int i; |
781 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; | |
782 | ||
d65eba6a | 783 | list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { |
8e7561cf RS |
784 | for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { |
785 | struct resource *res = &dev->resource[i]; | |
786 | if ((res->flags & type_mask) && !res->start && | |
787 | res->end) { | |
788 | /* Could not assign a required resources | |
789 | * for this device, remove it */ | |
210647af | 790 | pci_stop_and_remove_bus_device(dev); |
8e7561cf RS |
791 | break; |
792 | } | |
793 | } | |
794 | } | |
795 | } | |
796 | ||
1da177e4 LT |
797 | /* |
798 | * ACPI event handlers | |
799 | */ | |
800 | ||
3f327e39 YL |
801 | void acpiphp_check_host_bridge(acpi_handle handle) |
802 | { | |
803 | struct acpiphp_bridge *bridge; | |
804 | ||
805 | bridge = acpiphp_handle_to_bridge(handle); | |
806 | if (bridge) { | |
807 | acpiphp_check_bridge(bridge); | |
808 | put_bridge(bridge); | |
809 | } | |
3f327e39 YL |
810 | } |
811 | ||
43e5c091 | 812 | static void hotplug_event(acpi_handle handle, u32 type, void *data) |
1da177e4 | 813 | { |
43e5c091 | 814 | struct acpiphp_context *context = data; |
bd4674df | 815 | struct acpiphp_func *func = &context->func; |
1da177e4 LT |
816 | struct acpiphp_bridge *bridge; |
817 | char objname[64]; | |
818 | struct acpi_buffer buffer = { .length = sizeof(objname), | |
819 | .pointer = objname }; | |
6af8bef1 | 820 | |
43e5c091 | 821 | mutex_lock(&acpiphp_context_lock); |
c8ebcf1f | 822 | bridge = context->bridge; |
43e5c091 RW |
823 | if (bridge) |
824 | get_bridge(bridge); | |
1da177e4 | 825 | |
43e5c091 | 826 | mutex_unlock(&acpiphp_context_lock); |
3757b948 | 827 | |
1da177e4 LT |
828 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
829 | ||
830 | switch (type) { | |
831 | case ACPI_NOTIFY_BUS_CHECK: | |
832 | /* bus re-enumerate */ | |
66bef8c0 | 833 | dbg("%s: Bus check notify on %s\n", __func__, objname); |
be6d2867 | 834 | dbg("%s: re-enumerating slots under %s\n", __func__, objname); |
43e5c091 RW |
835 | if (bridge) { |
836 | acpiphp_check_bridge(bridge); | |
43e5c091 | 837 | } else { |
4ebe3450 RW |
838 | struct acpiphp_slot *slot = func->slot; |
839 | ||
840 | mutex_lock(&slot->crit_sect); | |
a1d0abce | 841 | enable_slot(slot); |
4ebe3450 | 842 | mutex_unlock(&slot->crit_sect); |
43e5c091 | 843 | } |
1da177e4 LT |
844 | break; |
845 | ||
846 | case ACPI_NOTIFY_DEVICE_CHECK: | |
847 | /* device check */ | |
66bef8c0 | 848 | dbg("%s: Device check notify on %s\n", __func__, objname); |
a47d8c8e | 849 | if (bridge) { |
43e5c091 | 850 | acpiphp_check_bridge(bridge); |
a47d8c8e RW |
851 | } else { |
852 | struct acpiphp_slot *slot = func->slot; | |
853 | int ret; | |
43e5c091 | 854 | |
a47d8c8e RW |
855 | /* |
856 | * Check if anything has changed in the slot and rescan | |
857 | * from the parent if that's the case. | |
858 | */ | |
859 | mutex_lock(&slot->crit_sect); | |
860 | ret = acpiphp_rescan_slot(slot); | |
861 | mutex_unlock(&slot->crit_sect); | |
862 | if (ret) | |
863 | acpiphp_check_bridge(func->parent); | |
864 | } | |
1da177e4 LT |
865 | break; |
866 | ||
1da177e4 LT |
867 | case ACPI_NOTIFY_EJECT_REQUEST: |
868 | /* request device eject */ | |
66bef8c0 | 869 | dbg("%s: Device eject notify on %s\n", __func__, objname); |
ad21d2d0 | 870 | acpiphp_disable_and_eject_slot(func->slot); |
1da177e4 | 871 | break; |
1da177e4 | 872 | } |
6af8bef1 | 873 | |
43e5c091 RW |
874 | if (bridge) |
875 | put_bridge(bridge); | |
21a31013 RW |
876 | } |
877 | ||
43e5c091 | 878 | static void hotplug_event_work(struct work_struct *work) |
21a31013 | 879 | { |
c8ebcf1f | 880 | struct acpiphp_context *context; |
21a31013 | 881 | struct acpi_hp_work *hp_work; |
21a31013 RW |
882 | |
883 | hp_work = container_of(work, struct acpi_hp_work, work); | |
c8ebcf1f | 884 | context = hp_work->context; |
21a31013 RW |
885 | acpi_scan_lock_acquire(); |
886 | ||
43e5c091 | 887 | hotplug_event(hp_work->handle, hp_work->type, context); |
6af8bef1 | 888 | |
3757b948 | 889 | acpi_scan_lock_release(); |
e532e84e RW |
890 | acpi_evaluate_hotplug_ost(hp_work->handle, hp_work->type, |
891 | ACPI_OST_SC_SUCCESS, NULL); | |
43e5c091 | 892 | kfree(hp_work); /* allocated in handle_hotplug_event() */ |
bda46dbb | 893 | put_bridge(context->func.parent); |
1da177e4 LT |
894 | } |
895 | ||
6af8bef1 | 896 | /** |
87831273 | 897 | * handle_hotplug_event - handle ACPI hotplug event |
6af8bef1 PB |
898 | * @handle: Notify()'ed acpi_handle |
899 | * @type: Notify code | |
87831273 | 900 | * @data: pointer to acpiphp_context structure |
6af8bef1 PB |
901 | * |
902 | * Handles ACPI event notification on slots. | |
903 | */ | |
87831273 | 904 | static void handle_hotplug_event(acpi_handle handle, u32 type, void *data) |
6af8bef1 | 905 | { |
87831273 | 906 | struct acpiphp_context *context; |
e532e84e | 907 | u32 ost_code = ACPI_OST_SC_SUCCESS; |
87831273 | 908 | |
5c8d0e1d RW |
909 | switch (type) { |
910 | case ACPI_NOTIFY_BUS_CHECK: | |
911 | case ACPI_NOTIFY_DEVICE_CHECK: | |
e532e84e | 912 | break; |
5c8d0e1d | 913 | case ACPI_NOTIFY_EJECT_REQUEST: |
e532e84e RW |
914 | ost_code = ACPI_OST_SC_EJECT_IN_PROGRESS; |
915 | acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); | |
5c8d0e1d RW |
916 | break; |
917 | ||
918 | case ACPI_NOTIFY_DEVICE_WAKE: | |
919 | return; | |
920 | ||
921 | case ACPI_NOTIFY_FREQUENCY_MISMATCH: | |
922 | acpi_handle_err(handle, "Device cannot be configured due " | |
923 | "to a frequency mismatch\n"); | |
e532e84e | 924 | goto out; |
5c8d0e1d RW |
925 | |
926 | case ACPI_NOTIFY_BUS_MODE_MISMATCH: | |
927 | acpi_handle_err(handle, "Device cannot be configured due " | |
928 | "to a bus mode mismatch\n"); | |
e532e84e | 929 | goto out; |
5c8d0e1d RW |
930 | |
931 | case ACPI_NOTIFY_POWER_FAULT: | |
932 | acpi_handle_err(handle, "Device has suffered a power fault\n"); | |
e532e84e | 933 | goto out; |
5c8d0e1d RW |
934 | |
935 | default: | |
936 | acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type); | |
e532e84e RW |
937 | ost_code = ACPI_OST_SC_UNRECOGNIZED_NOTIFY; |
938 | goto out; | |
5c8d0e1d RW |
939 | } |
940 | ||
87831273 RW |
941 | mutex_lock(&acpiphp_context_lock); |
942 | context = acpiphp_get_context(handle); | |
943 | if (context) { | |
bda46dbb | 944 | get_bridge(context->func.parent); |
bbd34fcd | 945 | acpiphp_put_context(context); |
5c8d0e1d | 946 | alloc_acpi_hp_work(handle, type, context, hotplug_event_work); |
e532e84e RW |
947 | mutex_unlock(&acpiphp_context_lock); |
948 | return; | |
87831273 RW |
949 | } |
950 | mutex_unlock(&acpiphp_context_lock); | |
e532e84e RW |
951 | ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
952 | ||
953 | out: | |
954 | acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); | |
8e7561cf | 955 | } |
1da177e4 | 956 | |
3b63aaa7 JL |
957 | /* |
958 | * Create hotplug slots for the PCI bus. | |
959 | * It should always return 0 to avoid skipping following notifiers. | |
1da177e4 | 960 | */ |
be1c9de9 | 961 | void acpiphp_enumerate_slots(struct pci_bus *bus) |
1da177e4 | 962 | { |
3b63aaa7 | 963 | struct acpiphp_bridge *bridge; |
2552002a RW |
964 | acpi_handle handle; |
965 | acpi_status status; | |
1da177e4 | 966 | |
3b63aaa7 JL |
967 | if (acpiphp_disabled) |
968 | return; | |
1da177e4 | 969 | |
be1c9de9 | 970 | handle = ACPI_HANDLE(bus->bridge); |
bbd34fcd | 971 | if (!handle) |
3b63aaa7 | 972 | return; |
1da177e4 | 973 | |
3b63aaa7 | 974 | bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); |
cb7b8ced RW |
975 | if (!bridge) { |
976 | acpi_handle_err(handle, "No memory for bridge object\n"); | |
3b63aaa7 JL |
977 | return; |
978 | } | |
979 | ||
ad41dd9d | 980 | INIT_LIST_HEAD(&bridge->slots); |
3d54a316 | 981 | kref_init(&bridge->ref); |
3b63aaa7 JL |
982 | bridge->pci_dev = pci_dev_get(bus->self); |
983 | bridge->pci_bus = bus; | |
984 | ||
985 | /* | |
986 | * Grab a ref to the subordinate PCI bus in case the bus is | |
987 | * removed via PCI core logical hotplug. The ref pins the bus | |
988 | * (which we access during module unload). | |
989 | */ | |
990 | get_device(&bus->dev); | |
991 | ||
bbd34fcd RW |
992 | if (!pci_is_root_bus(bridge->pci_bus)) { |
993 | struct acpiphp_context *context; | |
994 | ||
995 | /* | |
996 | * This bridge should have been registered as a hotplug function | |
997 | * under its parent, so the context has to be there. If not, we | |
998 | * are in deep goo. | |
999 | */ | |
1000 | mutex_lock(&acpiphp_context_lock); | |
1001 | context = acpiphp_get_context(handle); | |
bd4674df | 1002 | if (WARN_ON(!context)) { |
bbd34fcd RW |
1003 | mutex_unlock(&acpiphp_context_lock); |
1004 | put_device(&bus->dev); | |
1005 | kfree(bridge); | |
1006 | return; | |
1007 | } | |
1008 | bridge->context = context; | |
1009 | context->bridge = bridge; | |
1010 | /* Get a reference to the parent bridge. */ | |
bda46dbb | 1011 | get_bridge(context->func.parent); |
bbd34fcd RW |
1012 | mutex_unlock(&acpiphp_context_lock); |
1013 | } | |
1014 | ||
2552002a RW |
1015 | /* must be added to the list prior to calling register_slot */ |
1016 | mutex_lock(&bridge_mutex); | |
1017 | list_add(&bridge->list, &bridge_list); | |
1018 | mutex_unlock(&bridge_mutex); | |
1019 | ||
1020 | /* register all slot objects under this bridge */ | |
89373a55 | 1021 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, |
2552002a RW |
1022 | register_slot, NULL, bridge, NULL); |
1023 | if (ACPI_FAILURE(status)) { | |
89373a55 | 1024 | acpi_handle_err(handle, "failed to register slots\n"); |
bbd34fcd RW |
1025 | cleanup_bridge(bridge); |
1026 | put_bridge(bridge); | |
2552002a | 1027 | } |
3b63aaa7 JL |
1028 | } |
1029 | ||
1030 | /* Destroy hotplug slots associated with the PCI bus */ | |
1031 | void acpiphp_remove_slots(struct pci_bus *bus) | |
1da177e4 | 1032 | { |
ff181e5a | 1033 | struct acpiphp_bridge *bridge; |
3b63aaa7 JL |
1034 | |
1035 | if (acpiphp_disabled) | |
1036 | return; | |
1037 | ||
ff181e5a RW |
1038 | mutex_lock(&bridge_mutex); |
1039 | list_for_each_entry(bridge, &bridge_list, list) | |
3b63aaa7 | 1040 | if (bridge->pci_bus == bus) { |
ff181e5a | 1041 | mutex_unlock(&bridge_mutex); |
3b63aaa7 | 1042 | cleanup_bridge(bridge); |
3d54a316 | 1043 | put_bridge(bridge); |
ff181e5a | 1044 | return; |
3b63aaa7 | 1045 | } |
ff181e5a RW |
1046 | |
1047 | mutex_unlock(&bridge_mutex); | |
1da177e4 LT |
1048 | } |
1049 | ||
1da177e4 LT |
1050 | /** |
1051 | * acpiphp_enable_slot - power on slot | |
26e6c66e | 1052 | * @slot: ACPI PHP slot |
1da177e4 LT |
1053 | */ |
1054 | int acpiphp_enable_slot(struct acpiphp_slot *slot) | |
1055 | { | |
6aa4cdd0 | 1056 | mutex_lock(&slot->crit_sect); |
bc805a55 | 1057 | /* configure all functions */ |
55502ddb | 1058 | if (!(slot->flags & SLOT_ENABLED)) |
a1d0abce | 1059 | enable_slot(slot); |
55502ddb | 1060 | |
6aa4cdd0 | 1061 | mutex_unlock(&slot->crit_sect); |
a1d0abce | 1062 | return 0; |
1da177e4 LT |
1063 | } |
1064 | ||
1da177e4 | 1065 | /** |
ad21d2d0 | 1066 | * acpiphp_disable_and_eject_slot - power off and eject slot |
26e6c66e | 1067 | * @slot: ACPI PHP slot |
1da177e4 | 1068 | */ |
ad21d2d0 | 1069 | int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) |
1da177e4 | 1070 | { |
ad21d2d0 | 1071 | struct acpiphp_func *func; |
1da177e4 LT |
1072 | int retval = 0; |
1073 | ||
6aa4cdd0 | 1074 | mutex_lock(&slot->crit_sect); |
1da177e4 LT |
1075 | |
1076 | /* unconfigure all functions */ | |
a1d0abce | 1077 | disable_slot(slot); |
1da177e4 | 1078 | |
ad21d2d0 MW |
1079 | list_for_each_entry(func, &slot->funcs, sibling) |
1080 | if (func->flags & FUNC_HAS_EJ0) { | |
1081 | acpi_handle handle = func_to_handle(func); | |
1082 | ||
1083 | if (ACPI_FAILURE(acpi_evaluate_ej0(handle))) | |
1084 | acpi_handle_err(handle, "_EJ0 failed\n"); | |
1085 | ||
1086 | break; | |
1087 | } | |
1088 | ||
6aa4cdd0 | 1089 | mutex_unlock(&slot->crit_sect); |
1da177e4 LT |
1090 | return retval; |
1091 | } | |
1092 | ||
1093 | ||
1094 | /* | |
1095 | * slot enabled: 1 | |
1096 | * slot disabled: 0 | |
1097 | */ | |
1098 | u8 acpiphp_get_power_status(struct acpiphp_slot *slot) | |
1099 | { | |
bc805a55 | 1100 | return (slot->flags & SLOT_ENABLED); |
1da177e4 LT |
1101 | } |
1102 | ||
1103 | ||
1104 | /* | |
35ae61a0 MT |
1105 | * latch open: 1 |
1106 | * latch closed: 0 | |
1da177e4 LT |
1107 | */ |
1108 | u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) | |
1109 | { | |
1ad3790a | 1110 | return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); |
1da177e4 LT |
1111 | } |
1112 | ||
1113 | ||
1114 | /* | |
1115 | * adapter presence : 1 | |
1116 | * absence : 0 | |
1117 | */ | |
1118 | u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) | |
1119 | { | |
1ad3790a | 1120 | return !!get_slot_status(slot); |
1da177e4 | 1121 | } |