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 | ||
bd950799 LT |
42 | #define pr_fmt(fmt) "acpiphp_glue: " fmt |
43 | ||
1da177e4 LT |
44 | #include <linux/module.h> |
45 | ||
46 | #include <linux/kernel.h> | |
47 | #include <linux/pci.h> | |
7a54f25c | 48 | #include <linux/pci_hotplug.h> |
e8c331e9 | 49 | #include <linux/pci-acpi.h> |
4ebe3450 | 50 | #include <linux/pm_runtime.h> |
6aa4cdd0 | 51 | #include <linux/mutex.h> |
5a0e3ad6 | 52 | #include <linux/slab.h> |
6af8bef1 | 53 | #include <linux/acpi.h> |
1da177e4 LT |
54 | |
55 | #include "../pci.h" | |
1da177e4 LT |
56 | #include "acpiphp.h" |
57 | ||
58 | static LIST_HEAD(bridge_list); | |
3d54a316 | 59 | static DEFINE_MUTEX(bridge_mutex); |
1da177e4 | 60 | |
be27b3dc | 61 | static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type); |
edf5bf34 | 62 | static void acpiphp_post_dock_fixup(struct acpi_device *adev); |
8e5dce35 | 63 | static void acpiphp_sanitize_bus(struct pci_bus *bus); |
fca6825a | 64 | static void acpiphp_set_hpp_values(struct pci_bus *bus); |
d3a1ebb0 | 65 | static void hotplug_event(u32 type, struct acpiphp_context *context); |
3d54a316 | 66 | static void free_bridge(struct kref *kref); |
8e5dce35 | 67 | |
cb7b8ced RW |
68 | /** |
69 | * acpiphp_init_context - Create hotplug context and grab a reference to it. | |
bbcbfc0e | 70 | * @adev: ACPI device object to create the context for. |
cb7b8ced | 71 | * |
e525506f | 72 | * Call under acpi_hp_context_lock. |
cb7b8ced | 73 | */ |
bbcbfc0e | 74 | static struct acpiphp_context *acpiphp_init_context(struct acpi_device *adev) |
cb7b8ced RW |
75 | { |
76 | struct acpiphp_context *context; | |
cb7b8ced RW |
77 | |
78 | context = kzalloc(sizeof(*context), GFP_KERNEL); | |
79 | if (!context) | |
80 | return NULL; | |
81 | ||
cb7b8ced | 82 | context->refcount = 1; |
be27b3dc | 83 | acpi_set_hp_context(adev, &context->hp, acpiphp_hotplug_notify, NULL, |
edf5bf34 | 84 | acpiphp_post_dock_fixup); |
cb7b8ced RW |
85 | return context; |
86 | } | |
87 | ||
88 | /** | |
89 | * acpiphp_get_context - Get hotplug context and grab a reference to it. | |
3c2cc7ff | 90 | * @adev: ACPI device object to get the context for. |
cb7b8ced | 91 | * |
e525506f | 92 | * Call under acpi_hp_context_lock. |
cb7b8ced | 93 | */ |
3c2cc7ff | 94 | static struct acpiphp_context *acpiphp_get_context(struct acpi_device *adev) |
cb7b8ced | 95 | { |
3c2cc7ff | 96 | struct acpiphp_context *context; |
cb7b8ced | 97 | |
3c2cc7ff RW |
98 | if (!adev->hp) |
99 | return NULL; | |
100 | ||
101 | context = to_acpiphp_context(adev->hp); | |
102 | context->refcount++; | |
cb7b8ced RW |
103 | return context; |
104 | } | |
105 | ||
106 | /** | |
107 | * acpiphp_put_context - Drop a reference to ACPI hotplug context. | |
bbcbfc0e | 108 | * @context: ACPI hotplug context to drop a reference to. |
cb7b8ced RW |
109 | * |
110 | * The context object is removed if there are no more references to it. | |
111 | * | |
e525506f | 112 | * Call under acpi_hp_context_lock. |
cb7b8ced RW |
113 | */ |
114 | static void acpiphp_put_context(struct acpiphp_context *context) | |
115 | { | |
116 | if (--context->refcount) | |
117 | return; | |
118 | ||
bd4674df | 119 | WARN_ON(context->bridge); |
3c2cc7ff | 120 | context->hp.self->hp = NULL; |
cb7b8ced RW |
121 | kfree(context); |
122 | } | |
123 | ||
3d54a316 JL |
124 | static inline void get_bridge(struct acpiphp_bridge *bridge) |
125 | { | |
126 | kref_get(&bridge->ref); | |
127 | } | |
128 | ||
129 | static inline void put_bridge(struct acpiphp_bridge *bridge) | |
130 | { | |
131 | kref_put(&bridge->ref, free_bridge); | |
132 | } | |
133 | ||
edf5bf34 RW |
134 | static struct acpiphp_context *acpiphp_grab_context(struct acpi_device *adev) |
135 | { | |
136 | struct acpiphp_context *context; | |
137 | ||
138 | acpi_lock_hp_context(); | |
139 | context = acpiphp_get_context(adev); | |
140 | if (!context || context->func.parent->is_going_away) { | |
141 | acpi_unlock_hp_context(); | |
142 | return NULL; | |
143 | } | |
144 | get_bridge(context->func.parent); | |
145 | acpiphp_put_context(context); | |
146 | acpi_unlock_hp_context(); | |
147 | return context; | |
148 | } | |
149 | ||
150 | static void acpiphp_let_context_go(struct acpiphp_context *context) | |
151 | { | |
152 | put_bridge(context->func.parent); | |
153 | } | |
154 | ||
3d54a316 JL |
155 | static void free_bridge(struct kref *kref) |
156 | { | |
cb7b8ced | 157 | struct acpiphp_context *context; |
3d54a316 JL |
158 | struct acpiphp_bridge *bridge; |
159 | struct acpiphp_slot *slot, *next; | |
160 | struct acpiphp_func *func, *tmp; | |
161 | ||
e525506f | 162 | acpi_lock_hp_context(); |
cb7b8ced | 163 | |
3d54a316 JL |
164 | bridge = container_of(kref, struct acpiphp_bridge, ref); |
165 | ||
166 | list_for_each_entry_safe(slot, next, &bridge->slots, node) { | |
bd4674df RW |
167 | list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) |
168 | acpiphp_put_context(func_to_context(func)); | |
169 | ||
3d54a316 JL |
170 | kfree(slot); |
171 | } | |
172 | ||
87831273 | 173 | context = bridge->context; |
bbd34fcd RW |
174 | /* Root bridges will not have hotplug context. */ |
175 | if (context) { | |
176 | /* Release the reference taken by acpiphp_enumerate_slots(). */ | |
bda46dbb | 177 | put_bridge(context->func.parent); |
bbd34fcd RW |
178 | context->bridge = NULL; |
179 | acpiphp_put_context(context); | |
180 | } | |
cb7b8ced | 181 | |
3d54a316 JL |
182 | put_device(&bridge->pci_bus->dev); |
183 | pci_dev_put(bridge->pci_dev); | |
184 | kfree(bridge); | |
cb7b8ced | 185 | |
e525506f | 186 | acpi_unlock_hp_context(); |
3d54a316 JL |
187 | } |
188 | ||
edf5bf34 RW |
189 | /** |
190 | * acpiphp_post_dock_fixup - Post-dock fixups for PCI devices. | |
191 | * @adev: ACPI device object corresponding to a PCI device. | |
4e8662bb | 192 | * |
edf5bf34 | 193 | * TBD - figure out a way to only call fixups for systems that require them. |
4e8662bb | 194 | */ |
edf5bf34 | 195 | static void acpiphp_post_dock_fixup(struct acpi_device *adev) |
4e8662bb | 196 | { |
edf5bf34 RW |
197 | struct acpiphp_context *context = acpiphp_grab_context(adev); |
198 | struct pci_bus *bus; | |
4e8662bb KA |
199 | u32 buses; |
200 | ||
edf5bf34 | 201 | if (!context) |
f09ce741 | 202 | return; |
4e8662bb | 203 | |
edf5bf34 RW |
204 | bus = context->func.slot->bus; |
205 | if (!bus->self) | |
206 | goto out; | |
207 | ||
4e8662bb KA |
208 | /* fixup bad _DCK function that rewrites |
209 | * secondary bridge on slot | |
210 | */ | |
edf5bf34 | 211 | pci_read_config_dword(bus->self, PCI_PRIMARY_BUS, &buses); |
4e8662bb | 212 | |
b918c62e | 213 | if (((buses >> 8) & 0xff) != bus->busn_res.start) { |
4e8662bb | 214 | buses = (buses & 0xff000000) |
2a9d3521 | 215 | | ((unsigned int)(bus->primary) << 0) |
b918c62e YL |
216 | | ((unsigned int)(bus->busn_res.start) << 8) |
217 | | ((unsigned int)(bus->busn_res.end) << 16); | |
4e8662bb KA |
218 | pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); |
219 | } | |
4e8662bb | 220 | |
edf5bf34 RW |
221 | out: |
222 | acpiphp_let_context_go(context); | |
af9d8adc | 223 | } |
4e8662bb | 224 | |
5ba113f7 JL |
225 | /* Check whether the PCI device is managed by native PCIe hotplug driver */ |
226 | static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev) | |
227 | { | |
228 | u32 reg32; | |
229 | acpi_handle tmp; | |
230 | struct acpi_pci_root *root; | |
231 | ||
232 | /* Check whether the PCIe port supports native PCIe hotplug */ | |
233 | if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32)) | |
234 | return false; | |
235 | if (!(reg32 & PCI_EXP_SLTCAP_HPC)) | |
236 | return false; | |
237 | ||
238 | /* | |
239 | * Check whether native PCIe hotplug has been enabled for | |
240 | * this PCIe hierarchy. | |
241 | */ | |
242 | tmp = acpi_find_root_bridge_handle(pdev); | |
243 | if (!tmp) | |
244 | return false; | |
245 | root = acpi_pci_find_root(tmp); | |
246 | if (!root) | |
247 | return false; | |
248 | if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) | |
249 | return false; | |
250 | ||
251 | return true; | |
252 | } | |
253 | ||
3799c5a0 RW |
254 | /** |
255 | * acpiphp_add_context - Add ACPIPHP context to an ACPI device object. | |
256 | * @handle: ACPI handle of the object to add a context to. | |
257 | * @lvl: Not used. | |
258 | * @data: The object's parent ACPIPHP bridge. | |
259 | * @rv: Not used. | |
260 | */ | |
261 | static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data, | |
262 | void **rv) | |
1da177e4 | 263 | { |
cb7b8ced RW |
264 | struct acpiphp_bridge *bridge = data; |
265 | struct acpiphp_context *context; | |
bbcbfc0e | 266 | struct acpi_device *adev; |
1da177e4 LT |
267 | struct acpiphp_slot *slot; |
268 | struct acpiphp_func *newfunc; | |
1da177e4 | 269 | acpi_status status = AE_OK; |
bbd34fcd RW |
270 | unsigned long long adr; |
271 | int device, function; | |
e8c331e9 | 272 | struct pci_bus *pbus = bridge->pci_bus; |
bbd34fcd | 273 | struct pci_dev *pdev = bridge->pci_dev; |
3b63aaa7 | 274 | u32 val; |
1da177e4 | 275 | |
dfb117b3 BH |
276 | status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); |
277 | if (ACPI_FAILURE(status)) { | |
f26ca1d6 TK |
278 | if (status != AE_NOT_FOUND) |
279 | acpi_handle_warn(handle, | |
280 | "can't evaluate _ADR (%#x)\n", status); | |
dfb117b3 BH |
281 | return AE_OK; |
282 | } | |
bbcbfc0e RW |
283 | if (acpi_bus_get_device(handle, &adev)) |
284 | return AE_OK; | |
dfb117b3 BH |
285 | |
286 | device = (adr >> 16) & 0xffff; | |
287 | function = adr & 0xffff; | |
288 | ||
e525506f | 289 | acpi_lock_hp_context(); |
bbcbfc0e | 290 | context = acpiphp_init_context(adev); |
cb7b8ced | 291 | if (!context) { |
e525506f | 292 | acpi_unlock_hp_context(); |
cb7b8ced | 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; |
edf5bf34 | 299 | acpi_unlock_hp_context(); |
cb7b8ced | 300 | |
edf5bf34 RW |
301 | /* |
302 | * If this is a dock device, its _EJ0 should be executed by the dock | |
303 | * notify handler after calling _DCK. | |
304 | */ | |
305 | if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0")) | |
20416ea5 | 306 | newfunc->flags = FUNC_HAS_EJ0; |
1da177e4 | 307 | |
ecd046da | 308 | if (acpi_has_method(handle, "_STA")) |
1da177e4 LT |
309 | newfunc->flags |= FUNC_HAS_STA; |
310 | ||
1da177e4 | 311 | /* search for objects that share the same slot */ |
ad41dd9d | 312 | list_for_each_entry(slot, &bridge->slots, node) |
bbd34fcd | 313 | if (slot->device == device) |
ac372338 | 314 | goto slot_found; |
1da177e4 | 315 | |
ac372338 RW |
316 | slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); |
317 | if (!slot) { | |
e525506f | 318 | acpi_lock_hp_context(); |
146fc68a | 319 | acpiphp_put_context(context); |
e525506f | 320 | acpi_unlock_hp_context(); |
146fc68a | 321 | return AE_NO_MEMORY; |
ac372338 RW |
322 | } |
323 | ||
bda46dbb | 324 | slot->bus = bridge->pci_bus; |
ac372338 | 325 | slot->device = device; |
ac372338 | 326 | INIT_LIST_HEAD(&slot->funcs); |
ac372338 | 327 | |
ac372338 | 328 | list_add_tail(&slot->node, &bridge->slots); |
1da177e4 | 329 | |
cc6254e0 RW |
330 | /* |
331 | * Expose slots to user space for functions that have _EJ0 or _RMV or | |
332 | * are located in dock stations. Do not expose them for devices handled | |
333 | * by the native PCIe hotplug (PCIeHP), becuase that code is supposed to | |
334 | * expose slots to user space in those cases. | |
335 | */ | |
3b52b21f | 336 | if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev)) |
cc6254e0 | 337 | && !(pdev && device_is_managed_by_native_pciehp(pdev))) { |
bbd34fcd RW |
338 | unsigned long long sun; |
339 | int retval; | |
ac372338 | 340 | |
bbd34fcd RW |
341 | bridge->nr_slots++; |
342 | status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); | |
343 | if (ACPI_FAILURE(status)) | |
344 | sun = bridge->nr_slots; | |
345 | ||
bd950799 | 346 | pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", |
7342798d | 347 | sun, pci_domain_nr(pbus), pbus->number, device); |
bbd34fcd | 348 | |
7342798d | 349 | retval = acpiphp_register_hotplug_slot(slot, sun); |
bbd34fcd | 350 | if (retval) { |
1aaac071 | 351 | slot->slot = NULL; |
bbd34fcd RW |
352 | bridge->nr_slots--; |
353 | if (retval == -EBUSY) | |
227f0647 | 354 | pr_warn("Slot %llu already registered by another hotplug driver\n", sun); |
bbd34fcd | 355 | else |
227f0647 | 356 | pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval); |
bbd34fcd RW |
357 | } |
358 | /* Even if the slot registration fails, we can still use it. */ | |
1da177e4 LT |
359 | } |
360 | ||
ac372338 | 361 | slot_found: |
1da177e4 LT |
362 | newfunc->slot = slot; |
363 | list_add_tail(&newfunc->sibling, &slot->funcs); | |
364 | ||
3b63aaa7 JL |
365 | if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), |
366 | &val, 60*1000)) | |
bc805a55 | 367 | slot->flags |= SLOT_ENABLED; |
1da177e4 | 368 | |
2e862c51 | 369 | return AE_OK; |
1da177e4 LT |
370 | } |
371 | ||
1f7c164b | 372 | static struct acpiphp_bridge *acpiphp_dev_to_bridge(struct acpi_device *adev) |
42f49a6a | 373 | { |
ed13febf RW |
374 | struct acpiphp_context *context; |
375 | struct acpiphp_bridge *bridge = NULL; | |
58c08628 | 376 | |
e525506f | 377 | acpi_lock_hp_context(); |
3c2cc7ff | 378 | context = acpiphp_get_context(adev); |
ed13febf RW |
379 | if (context) { |
380 | bridge = context->bridge; | |
381 | if (bridge) | |
3d54a316 | 382 | get_bridge(bridge); |
42f49a6a | 383 | |
ed13febf RW |
384 | acpiphp_put_context(context); |
385 | } | |
e525506f | 386 | acpi_unlock_hp_context(); |
ed13febf | 387 | return bridge; |
42f49a6a | 388 | } |
1da177e4 | 389 | |
364d5094 | 390 | static void cleanup_bridge(struct acpiphp_bridge *bridge) |
1da177e4 | 391 | { |
3d54a316 JL |
392 | struct acpiphp_slot *slot; |
393 | struct acpiphp_func *func; | |
42f49a6a | 394 | |
3d54a316 JL |
395 | list_for_each_entry(slot, &bridge->slots, node) { |
396 | list_for_each_entry(func, &slot->funcs, sibling) { | |
1a699476 | 397 | struct acpi_device *adev = func_to_acpi_device(func); |
5a3bc573 | 398 | |
1a699476 | 399 | acpi_lock_hp_context(); |
be27b3dc | 400 | adev->hp->notify = NULL; |
edf5bf34 | 401 | adev->hp->fixup = NULL; |
1a699476 | 402 | acpi_unlock_hp_context(); |
42f49a6a | 403 | } |
9217a984 | 404 | slot->flags |= SLOT_IS_GOING_AWAY; |
1aaac071 RW |
405 | if (slot->slot) |
406 | acpiphp_unregister_hotplug_slot(slot); | |
42f49a6a RS |
407 | } |
408 | ||
3d54a316 | 409 | mutex_lock(&bridge_mutex); |
42f49a6a | 410 | list_del(&bridge->list); |
3d54a316 | 411 | mutex_unlock(&bridge_mutex); |
9217a984 | 412 | |
e525506f | 413 | acpi_lock_hp_context(); |
9217a984 | 414 | bridge->is_going_away = true; |
e525506f | 415 | acpi_unlock_hp_context(); |
1da177e4 LT |
416 | } |
417 | ||
15a1ae74 | 418 | /** |
26e6c66e | 419 | * acpiphp_max_busnr - return the highest reserved bus number under the given bus. |
15a1ae74 | 420 | * @bus: bus to start search with |
15a1ae74 KA |
421 | */ |
422 | static unsigned char acpiphp_max_busnr(struct pci_bus *bus) | |
423 | { | |
c6f0d5ad | 424 | struct pci_bus *tmp; |
15a1ae74 KA |
425 | unsigned char max, n; |
426 | ||
427 | /* | |
428 | * pci_bus_max_busnr will return the highest | |
429 | * reserved busnr for all these children. | |
430 | * that is equivalent to the bus->subordinate | |
431 | * value. We don't want to use the parent's | |
432 | * bus->subordinate value because it could have | |
433 | * padding in it. | |
434 | */ | |
b918c62e | 435 | max = bus->busn_res.start; |
15a1ae74 | 436 | |
c6f0d5ad YW |
437 | list_for_each_entry(tmp, &bus->children, node) { |
438 | n = pci_bus_max_busnr(tmp); | |
15a1ae74 KA |
439 | if (n > max) |
440 | max = n; | |
441 | } | |
442 | return max; | |
443 | } | |
444 | ||
d0607050 SL |
445 | static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) |
446 | { | |
447 | struct acpiphp_func *func; | |
448 | union acpi_object params[2]; | |
449 | struct acpi_object_list arg_list; | |
450 | ||
451 | list_for_each_entry(func, &slot->funcs, sibling) { | |
452 | arg_list.count = 2; | |
453 | arg_list.pointer = params; | |
454 | params[0].type = ACPI_TYPE_INTEGER; | |
455 | params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; | |
456 | params[1].type = ACPI_TYPE_INTEGER; | |
457 | params[1].integer.value = 1; | |
458 | /* _REG is optional, we don't care about if there is failure */ | |
5a3bc573 RW |
459 | acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list, |
460 | NULL); | |
d0607050 SL |
461 | } |
462 | } | |
463 | ||
1f96a965 YL |
464 | static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) |
465 | { | |
466 | struct acpiphp_func *func; | |
467 | ||
1f96a965 YL |
468 | /* quirk, or pcie could set it already */ |
469 | if (dev->is_hotplug_bridge) | |
470 | return; | |
471 | ||
1f96a965 YL |
472 | list_for_each_entry(func, &slot->funcs, sibling) { |
473 | if (PCI_FUNC(dev->devfn) == func->function) { | |
bbd34fcd | 474 | dev->is_hotplug_bridge = 1; |
1f96a965 YL |
475 | break; |
476 | } | |
477 | } | |
478 | } | |
3b63aaa7 | 479 | |
a47d8c8e RW |
480 | static int acpiphp_rescan_slot(struct acpiphp_slot *slot) |
481 | { | |
482 | struct acpiphp_func *func; | |
483 | ||
b6708fbf RW |
484 | list_for_each_entry(func, &slot->funcs, sibling) { |
485 | struct acpi_device *adev = func_to_acpi_device(func); | |
a47d8c8e | 486 | |
b6708fbf RW |
487 | acpi_bus_scan(adev->handle); |
488 | if (acpi_device_enumerated(adev)) | |
489 | acpi_device_set_power(adev, ACPI_STATE_D0); | |
490 | } | |
a47d8c8e RW |
491 | return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0)); |
492 | } | |
493 | ||
1da177e4 | 494 | /** |
a1d0abce | 495 | * enable_slot - enable, configure a slot |
1da177e4 LT |
496 | * @slot: slot to be enabled |
497 | * | |
498 | * This function should be called per *physical slot*, | |
499 | * not per each slot object in ACPI namespace. | |
1da177e4 | 500 | */ |
10874f5a | 501 | static void enable_slot(struct acpiphp_slot *slot) |
1da177e4 | 502 | { |
1da177e4 | 503 | struct pci_dev *dev; |
bda46dbb | 504 | struct pci_bus *bus = slot->bus; |
1da177e4 | 505 | struct acpiphp_func *func; |
b91182a6 | 506 | int max, pass; |
d66ecb72 | 507 | LIST_HEAD(add_list); |
1da177e4 | 508 | |
ab122590 | 509 | acpiphp_rescan_slot(slot); |
15a1ae74 | 510 | max = acpiphp_max_busnr(bus); |
42f49a6a RS |
511 | for (pass = 0; pass < 2; pass++) { |
512 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
513 | if (PCI_SLOT(dev->devfn) != slot->device) | |
514 | continue; | |
a1d0abce | 515 | |
c7a071f6 | 516 | if (pci_is_bridge(dev)) { |
42f49a6a | 517 | max = pci_scan_bridge(bus, dev, max, pass); |
1f96a965 YL |
518 | if (pass && dev->subordinate) { |
519 | check_hotplug_bridge(slot, dev); | |
d66ecb72 JL |
520 | pcibios_resource_survey_bus(dev->subordinate); |
521 | __pci_bus_size_bridges(dev->subordinate, | |
522 | &add_list); | |
1f96a965 | 523 | } |
c64b5eea | 524 | } |
42f49a6a | 525 | } |
1da177e4 | 526 | } |
d66ecb72 | 527 | __pci_bus_assign_resources(bus, &add_list, NULL); |
2dc41281 | 528 | |
8e5dce35 | 529 | acpiphp_sanitize_bus(bus); |
fca6825a | 530 | acpiphp_set_hpp_values(bus); |
d0607050 | 531 | acpiphp_set_acpi_region(slot); |
69643e48 IC |
532 | |
533 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
534 | /* Assume that newly added devices are powered on already. */ | |
535 | if (!dev->is_added) | |
536 | dev->current_state = PCI_D0; | |
537 | } | |
538 | ||
42f49a6a RS |
539 | pci_bus_add_devices(bus); |
540 | ||
f382a086 | 541 | slot->flags |= SLOT_ENABLED; |
58c08628 | 542 | list_for_each_entry(func, &slot->funcs, sibling) { |
9d911d79 AC |
543 | dev = pci_get_slot(bus, PCI_DEVFN(slot->device, |
544 | func->function)); | |
f382a086 AK |
545 | if (!dev) { |
546 | /* Do not set SLOT_ENABLED flag if some funcs | |
547 | are not added. */ | |
548 | slot->flags &= (~SLOT_ENABLED); | |
551bcb75 | 549 | continue; |
f382a086 | 550 | } |
1da177e4 | 551 | } |
1da177e4 LT |
552 | } |
553 | ||
1da177e4 | 554 | /** |
a1d0abce | 555 | * disable_slot - disable a slot |
26e6c66e | 556 | * @slot: ACPI PHP slot |
1da177e4 | 557 | */ |
a1d0abce | 558 | static void disable_slot(struct acpiphp_slot *slot) |
1da177e4 | 559 | { |
1c0c5443 RW |
560 | struct pci_bus *bus = slot->bus; |
561 | struct pci_dev *dev, *prev; | |
1da177e4 | 562 | struct acpiphp_func *func; |
551bcb75 | 563 | |
ce29ca3e | 564 | /* |
a1d0abce | 565 | * enable_slot() enumerates all functions in this device via |
ce29ca3e AK |
566 | * pci_scan_slot(), whether they have associated ACPI hotplug |
567 | * methods (_EJ0, etc.) or not. Therefore, we remove all functions | |
568 | * here. | |
569 | */ | |
1c0c5443 RW |
570 | list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list) |
571 | if (PCI_SLOT(dev->devfn) == slot->device) | |
572 | pci_stop_and_remove_bus_device(dev); | |
600812ec | 573 | |
5a3bc573 | 574 | list_for_each_entry(func, &slot->funcs, sibling) |
bbcbfc0e | 575 | acpi_bus_trim(func_to_acpi_device(func)); |
1da177e4 LT |
576 | |
577 | slot->flags &= (~SLOT_ENABLED); | |
1da177e4 LT |
578 | } |
579 | ||
b2118d6a | 580 | static bool acpiphp_no_hotplug(struct acpi_device *adev) |
f244d8b6 | 581 | { |
f244d8b6 RW |
582 | return adev && adev->flags.no_hotplug; |
583 | } | |
584 | ||
585 | static bool slot_no_hotplug(struct acpiphp_slot *slot) | |
586 | { | |
587 | struct acpiphp_func *func; | |
588 | ||
589 | list_for_each_entry(func, &slot->funcs, sibling) | |
bbcbfc0e | 590 | if (acpiphp_no_hotplug(func_to_acpi_device(func))) |
f244d8b6 RW |
591 | return true; |
592 | ||
593 | return false; | |
594 | } | |
1da177e4 LT |
595 | |
596 | /** | |
597 | * get_slot_status - get ACPI slot status | |
26e6c66e | 598 | * @slot: ACPI PHP slot |
1da177e4 | 599 | * |
26e6c66e RD |
600 | * If a slot has _STA for each function and if any one of them |
601 | * returned non-zero status, return it. | |
1da177e4 | 602 | * |
26e6c66e RD |
603 | * If a slot doesn't have _STA and if any one of its functions' |
604 | * configuration space is configured, return 0x0f as a _STA. | |
1da177e4 | 605 | * |
26e6c66e | 606 | * Otherwise return 0. |
1da177e4 LT |
607 | */ |
608 | static unsigned int get_slot_status(struct acpiphp_slot *slot) | |
609 | { | |
27663c58 | 610 | unsigned long long sta = 0; |
1da177e4 LT |
611 | struct acpiphp_func *func; |
612 | ||
58c08628 | 613 | list_for_each_entry(func, &slot->funcs, sibling) { |
1da177e4 | 614 | if (func->flags & FUNC_HAS_STA) { |
5a3bc573 RW |
615 | acpi_status status; |
616 | ||
617 | status = acpi_evaluate_integer(func_to_handle(func), | |
618 | "_STA", NULL, &sta); | |
1da177e4 LT |
619 | if (ACPI_SUCCESS(status) && sta) |
620 | break; | |
621 | } else { | |
5a3bc573 RW |
622 | u32 dvid; |
623 | ||
bda46dbb | 624 | pci_bus_read_config_dword(slot->bus, |
1da177e4 LT |
625 | PCI_DEVFN(slot->device, |
626 | func->function), | |
627 | PCI_VENDOR_ID, &dvid); | |
628 | if (dvid != 0xffffffff) { | |
629 | sta = ACPI_STA_ALL; | |
630 | break; | |
631 | } | |
632 | } | |
633 | } | |
634 | ||
635 | return (unsigned int)sta; | |
636 | } | |
637 | ||
72820594 MW |
638 | static inline bool device_status_valid(unsigned int sta) |
639 | { | |
640 | /* | |
641 | * ACPI spec says that _STA may return bit 0 clear with bit 3 set | |
642 | * if the device is valid but does not require a device driver to be | |
643 | * loaded (Section 6.3.7 of ACPI 5.0A). | |
644 | */ | |
645 | unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING; | |
646 | return (sta & mask) == mask; | |
647 | } | |
648 | ||
4ebe3450 RW |
649 | /** |
650 | * trim_stale_devices - remove PCI devices that are not responding. | |
651 | * @dev: PCI device to start walking the hierarchy from. | |
652 | */ | |
653 | static void trim_stale_devices(struct pci_dev *dev) | |
654 | { | |
4dc3082d | 655 | struct acpi_device *adev = ACPI_COMPANION(&dev->dev); |
4ebe3450 RW |
656 | struct pci_bus *bus = dev->subordinate; |
657 | bool alive = false; | |
658 | ||
4dc3082d | 659 | if (adev) { |
4ebe3450 RW |
660 | acpi_status status; |
661 | unsigned long long sta; | |
662 | ||
b2118d6a | 663 | status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta); |
72820594 | 664 | alive = (ACPI_SUCCESS(status) && device_status_valid(sta)) |
b2118d6a | 665 | || acpiphp_no_hotplug(adev); |
4ebe3450 | 666 | } |
b8a62d54 RW |
667 | if (!alive) |
668 | alive = pci_device_is_present(dev); | |
4ebe3450 | 669 | |
4ebe3450 RW |
670 | if (!alive) { |
671 | pci_stop_and_remove_bus_device(dev); | |
4dc3082d RW |
672 | if (adev) |
673 | acpi_bus_trim(adev); | |
4ebe3450 RW |
674 | } else if (bus) { |
675 | struct pci_dev *child, *tmp; | |
676 | ||
677 | /* The device is a bridge. so check the bus below it. */ | |
678 | pm_runtime_get_sync(&dev->dev); | |
2d7c1b77 | 679 | list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list) |
4ebe3450 RW |
680 | trim_stale_devices(child); |
681 | ||
682 | pm_runtime_put(&dev->dev); | |
683 | } | |
684 | } | |
685 | ||
1da177e4 LT |
686 | /** |
687 | * acpiphp_check_bridge - re-enumerate devices | |
26e6c66e | 688 | * @bridge: where to begin re-enumeration |
1da177e4 LT |
689 | * |
690 | * Iterate over all slots under this bridge and make sure that if a | |
691 | * card is present they are enabled, and if not they are disabled. | |
692 | */ | |
4ebe3450 | 693 | static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) |
1da177e4 LT |
694 | { |
695 | struct acpiphp_slot *slot; | |
1da177e4 | 696 | |
9217a984 RW |
697 | /* Bail out if the bridge is going away. */ |
698 | if (bridge->is_going_away) | |
699 | return; | |
700 | ||
ad41dd9d | 701 | list_for_each_entry(slot, &bridge->slots, node) { |
4ebe3450 RW |
702 | struct pci_bus *bus = slot->bus; |
703 | struct pci_dev *dev, *tmp; | |
704 | ||
f244d8b6 RW |
705 | if (slot_no_hotplug(slot)) { |
706 | ; /* do nothing */ | |
72820594 | 707 | } else if (device_status_valid(get_slot_status(slot))) { |
4ebe3450 | 708 | /* remove stale devices if any */ |
2d7c1b77 RW |
709 | list_for_each_entry_safe_reverse(dev, tmp, |
710 | &bus->devices, bus_list) | |
4ebe3450 RW |
711 | if (PCI_SLOT(dev->devfn) == slot->device) |
712 | trim_stale_devices(dev); | |
713 | ||
714 | /* configure all functions */ | |
a1d0abce | 715 | enable_slot(slot); |
1da177e4 | 716 | } else { |
a1d0abce | 717 | disable_slot(slot); |
1da177e4 LT |
718 | } |
719 | } | |
1da177e4 LT |
720 | } |
721 | ||
fca6825a | 722 | static void acpiphp_set_hpp_values(struct pci_bus *bus) |
8e7561cf | 723 | { |
8e7561cf RS |
724 | struct pci_dev *dev; |
725 | ||
e81995bb BH |
726 | list_for_each_entry(dev, &bus->devices, bus_list) |
727 | pci_configure_slot(dev); | |
8e7561cf RS |
728 | } |
729 | ||
730 | /* | |
731 | * Remove devices for which we could not assign resources, call | |
732 | * arch specific code to fix-up the bus | |
733 | */ | |
734 | static void acpiphp_sanitize_bus(struct pci_bus *bus) | |
735 | { | |
d65eba6a | 736 | struct pci_dev *dev, *tmp; |
8e7561cf RS |
737 | int i; |
738 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; | |
739 | ||
2d7c1b77 | 740 | list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) { |
8e7561cf RS |
741 | for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { |
742 | struct resource *res = &dev->resource[i]; | |
743 | if ((res->flags & type_mask) && !res->start && | |
744 | res->end) { | |
745 | /* Could not assign a required resources | |
746 | * for this device, remove it */ | |
210647af | 747 | pci_stop_and_remove_bus_device(dev); |
8e7561cf RS |
748 | break; |
749 | } | |
750 | } | |
751 | } | |
752 | } | |
753 | ||
1da177e4 LT |
754 | /* |
755 | * ACPI event handlers | |
756 | */ | |
757 | ||
1f7c164b | 758 | void acpiphp_check_host_bridge(struct acpi_device *adev) |
3f327e39 YL |
759 | { |
760 | struct acpiphp_bridge *bridge; | |
761 | ||
1f7c164b | 762 | bridge = acpiphp_dev_to_bridge(adev); |
3f327e39 | 763 | if (bridge) { |
d42f5da2 RW |
764 | pci_lock_rescan_remove(); |
765 | ||
3f327e39 | 766 | acpiphp_check_bridge(bridge); |
d42f5da2 RW |
767 | |
768 | pci_unlock_rescan_remove(); | |
3f327e39 YL |
769 | put_bridge(bridge); |
770 | } | |
3f327e39 YL |
771 | } |
772 | ||
9217a984 RW |
773 | static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot); |
774 | ||
d3a1ebb0 | 775 | static void hotplug_event(u32 type, struct acpiphp_context *context) |
1da177e4 | 776 | { |
3c2cc7ff | 777 | acpi_handle handle = context->hp.self->handle; |
bd4674df | 778 | struct acpiphp_func *func = &context->func; |
b75cece1 | 779 | struct acpiphp_slot *slot = func->slot; |
1da177e4 | 780 | struct acpiphp_bridge *bridge; |
6af8bef1 | 781 | |
e525506f | 782 | acpi_lock_hp_context(); |
c8ebcf1f | 783 | bridge = context->bridge; |
43e5c091 RW |
784 | if (bridge) |
785 | get_bridge(bridge); | |
1da177e4 | 786 | |
e525506f | 787 | acpi_unlock_hp_context(); |
3757b948 | 788 | |
f41b3261 | 789 | pci_lock_rescan_remove(); |
1da177e4 LT |
790 | |
791 | switch (type) { | |
792 | case ACPI_NOTIFY_BUS_CHECK: | |
793 | /* bus re-enumerate */ | |
1d4a5b61 | 794 | acpi_handle_debug(handle, "Bus check in %s()\n", __func__); |
b75cece1 | 795 | if (bridge) |
43e5c091 | 796 | acpiphp_check_bridge(bridge); |
b75cece1 | 797 | else if (!(slot->flags & SLOT_IS_GOING_AWAY)) |
a1d0abce | 798 | enable_slot(slot); |
4ebe3450 | 799 | |
1da177e4 LT |
800 | break; |
801 | ||
802 | case ACPI_NOTIFY_DEVICE_CHECK: | |
803 | /* device check */ | |
1d4a5b61 | 804 | acpi_handle_debug(handle, "Device check in %s()\n", __func__); |
a47d8c8e | 805 | if (bridge) { |
43e5c091 | 806 | acpiphp_check_bridge(bridge); |
b75cece1 | 807 | } else if (!(slot->flags & SLOT_IS_GOING_AWAY)) { |
a47d8c8e RW |
808 | /* |
809 | * Check if anything has changed in the slot and rescan | |
810 | * from the parent if that's the case. | |
811 | */ | |
661b4064 | 812 | if (acpiphp_rescan_slot(slot)) |
a47d8c8e RW |
813 | acpiphp_check_bridge(func->parent); |
814 | } | |
1da177e4 LT |
815 | break; |
816 | ||
1da177e4 LT |
817 | case ACPI_NOTIFY_EJECT_REQUEST: |
818 | /* request device eject */ | |
1d4a5b61 | 819 | acpi_handle_debug(handle, "Eject request in %s()\n", __func__); |
b75cece1 | 820 | acpiphp_disable_and_eject_slot(slot); |
1da177e4 | 821 | break; |
1da177e4 | 822 | } |
6af8bef1 | 823 | |
f41b3261 | 824 | pci_unlock_rescan_remove(); |
43e5c091 RW |
825 | if (bridge) |
826 | put_bridge(bridge); | |
21a31013 RW |
827 | } |
828 | ||
be27b3dc | 829 | static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type) |
6af8bef1 | 830 | { |
87831273 | 831 | struct acpiphp_context *context; |
87831273 | 832 | |
edf5bf34 RW |
833 | context = acpiphp_grab_context(adev); |
834 | if (!context) | |
3c2cc7ff | 835 | return -ENODATA; |
1b360f44 | 836 | |
3c2cc7ff | 837 | hotplug_event(type, context); |
edf5bf34 | 838 | acpiphp_let_context_go(context); |
3c2cc7ff | 839 | return 0; |
8e7561cf | 840 | } |
1da177e4 | 841 | |
454481ad RW |
842 | /** |
843 | * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus. | |
844 | * @bus: PCI bus to enumerate the slots for. | |
845 | * | |
846 | * A "slot" is an object associated with a PCI device number. All functions | |
847 | * (PCI devices) with the same bus and device number belong to the same slot. | |
1da177e4 | 848 | */ |
be1c9de9 | 849 | void acpiphp_enumerate_slots(struct pci_bus *bus) |
1da177e4 | 850 | { |
3b63aaa7 | 851 | struct acpiphp_bridge *bridge; |
bbcbfc0e | 852 | struct acpi_device *adev; |
2552002a RW |
853 | acpi_handle handle; |
854 | acpi_status status; | |
1da177e4 | 855 | |
3b63aaa7 JL |
856 | if (acpiphp_disabled) |
857 | return; | |
1da177e4 | 858 | |
bbcbfc0e RW |
859 | adev = ACPI_COMPANION(bus->bridge); |
860 | if (!adev) | |
3b63aaa7 | 861 | return; |
1da177e4 | 862 | |
bbcbfc0e | 863 | handle = adev->handle; |
3b63aaa7 | 864 | bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); |
cb7b8ced RW |
865 | if (!bridge) { |
866 | acpi_handle_err(handle, "No memory for bridge object\n"); | |
3b63aaa7 JL |
867 | return; |
868 | } | |
869 | ||
ad41dd9d | 870 | INIT_LIST_HEAD(&bridge->slots); |
3d54a316 | 871 | kref_init(&bridge->ref); |
3b63aaa7 JL |
872 | bridge->pci_dev = pci_dev_get(bus->self); |
873 | bridge->pci_bus = bus; | |
874 | ||
875 | /* | |
876 | * Grab a ref to the subordinate PCI bus in case the bus is | |
877 | * removed via PCI core logical hotplug. The ref pins the bus | |
878 | * (which we access during module unload). | |
879 | */ | |
880 | get_device(&bus->dev); | |
881 | ||
bbd34fcd RW |
882 | if (!pci_is_root_bus(bridge->pci_bus)) { |
883 | struct acpiphp_context *context; | |
884 | ||
885 | /* | |
886 | * This bridge should have been registered as a hotplug function | |
fd3cfebe RW |
887 | * under its parent, so the context should be there, unless the |
888 | * parent is going to be handled by pciehp, in which case this | |
889 | * bridge is not interesting to us either. | |
bbd34fcd | 890 | */ |
e525506f | 891 | acpi_lock_hp_context(); |
3c2cc7ff | 892 | context = acpiphp_get_context(adev); |
fd3cfebe | 893 | if (!context) { |
e525506f | 894 | acpi_unlock_hp_context(); |
bbd34fcd | 895 | put_device(&bus->dev); |
5d449457 | 896 | pci_dev_put(bridge->pci_dev); |
bbd34fcd RW |
897 | kfree(bridge); |
898 | return; | |
899 | } | |
900 | bridge->context = context; | |
901 | context->bridge = bridge; | |
902 | /* Get a reference to the parent bridge. */ | |
bda46dbb | 903 | get_bridge(context->func.parent); |
e525506f | 904 | acpi_unlock_hp_context(); |
bbd34fcd RW |
905 | } |
906 | ||
3799c5a0 | 907 | /* Must be added to the list prior to calling acpiphp_add_context(). */ |
2552002a RW |
908 | mutex_lock(&bridge_mutex); |
909 | list_add(&bridge->list, &bridge_list); | |
910 | mutex_unlock(&bridge_mutex); | |
911 | ||
912 | /* register all slot objects under this bridge */ | |
89373a55 | 913 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, |
3799c5a0 | 914 | acpiphp_add_context, NULL, bridge, NULL); |
2552002a | 915 | if (ACPI_FAILURE(status)) { |
89373a55 | 916 | acpi_handle_err(handle, "failed to register slots\n"); |
bbd34fcd RW |
917 | cleanup_bridge(bridge); |
918 | put_bridge(bridge); | |
2552002a | 919 | } |
3b63aaa7 JL |
920 | } |
921 | ||
454481ad RW |
922 | /** |
923 | * acpiphp_remove_slots - Remove slot objects associated with a given bus. | |
924 | * @bus: PCI bus to remove the slot objects for. | |
925 | */ | |
3b63aaa7 | 926 | void acpiphp_remove_slots(struct pci_bus *bus) |
1da177e4 | 927 | { |
ff181e5a | 928 | struct acpiphp_bridge *bridge; |
3b63aaa7 JL |
929 | |
930 | if (acpiphp_disabled) | |
931 | return; | |
932 | ||
ff181e5a RW |
933 | mutex_lock(&bridge_mutex); |
934 | list_for_each_entry(bridge, &bridge_list, list) | |
3b63aaa7 | 935 | if (bridge->pci_bus == bus) { |
ff181e5a | 936 | mutex_unlock(&bridge_mutex); |
3b63aaa7 | 937 | cleanup_bridge(bridge); |
3d54a316 | 938 | put_bridge(bridge); |
ff181e5a | 939 | return; |
3b63aaa7 | 940 | } |
ff181e5a RW |
941 | |
942 | mutex_unlock(&bridge_mutex); | |
1da177e4 LT |
943 | } |
944 | ||
1da177e4 LT |
945 | /** |
946 | * acpiphp_enable_slot - power on slot | |
26e6c66e | 947 | * @slot: ACPI PHP slot |
1da177e4 LT |
948 | */ |
949 | int acpiphp_enable_slot(struct acpiphp_slot *slot) | |
950 | { | |
9217a984 RW |
951 | pci_lock_rescan_remove(); |
952 | ||
953 | if (slot->flags & SLOT_IS_GOING_AWAY) | |
954 | return -ENODEV; | |
955 | ||
bc805a55 | 956 | /* configure all functions */ |
55502ddb | 957 | if (!(slot->flags & SLOT_ENABLED)) |
a1d0abce | 958 | enable_slot(slot); |
55502ddb | 959 | |
9217a984 | 960 | pci_unlock_rescan_remove(); |
a1d0abce | 961 | return 0; |
1da177e4 LT |
962 | } |
963 | ||
1da177e4 | 964 | /** |
ad21d2d0 | 965 | * acpiphp_disable_and_eject_slot - power off and eject slot |
26e6c66e | 966 | * @slot: ACPI PHP slot |
1da177e4 | 967 | */ |
9217a984 | 968 | static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) |
1da177e4 | 969 | { |
ad21d2d0 | 970 | struct acpiphp_func *func; |
9217a984 RW |
971 | |
972 | if (slot->flags & SLOT_IS_GOING_AWAY) | |
973 | return -ENODEV; | |
1da177e4 | 974 | |
1da177e4 | 975 | /* unconfigure all functions */ |
a1d0abce | 976 | disable_slot(slot); |
1da177e4 | 977 | |
ad21d2d0 MW |
978 | list_for_each_entry(func, &slot->funcs, sibling) |
979 | if (func->flags & FUNC_HAS_EJ0) { | |
980 | acpi_handle handle = func_to_handle(func); | |
981 | ||
982 | if (ACPI_FAILURE(acpi_evaluate_ej0(handle))) | |
983 | acpi_handle_err(handle, "_EJ0 failed\n"); | |
984 | ||
985 | break; | |
986 | } | |
987 | ||
9217a984 | 988 | return 0; |
1da177e4 LT |
989 | } |
990 | ||
9217a984 RW |
991 | int acpiphp_disable_slot(struct acpiphp_slot *slot) |
992 | { | |
993 | int ret; | |
994 | ||
21369c77 RW |
995 | /* |
996 | * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in | |
997 | * acpiphp_disable_and_eject_slot() will be synchronized properly. | |
998 | */ | |
999 | acpi_scan_lock_acquire(); | |
9217a984 RW |
1000 | pci_lock_rescan_remove(); |
1001 | ret = acpiphp_disable_and_eject_slot(slot); | |
1002 | pci_unlock_rescan_remove(); | |
21369c77 | 1003 | acpi_scan_lock_release(); |
9217a984 RW |
1004 | return ret; |
1005 | } | |
1da177e4 LT |
1006 | |
1007 | /* | |
1008 | * slot enabled: 1 | |
1009 | * slot disabled: 0 | |
1010 | */ | |
1011 | u8 acpiphp_get_power_status(struct acpiphp_slot *slot) | |
1012 | { | |
bc805a55 | 1013 | return (slot->flags & SLOT_ENABLED); |
1da177e4 LT |
1014 | } |
1015 | ||
1da177e4 | 1016 | /* |
35ae61a0 MT |
1017 | * latch open: 1 |
1018 | * latch closed: 0 | |
1da177e4 LT |
1019 | */ |
1020 | u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) | |
1021 | { | |
1ad3790a | 1022 | return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); |
1da177e4 LT |
1023 | } |
1024 | ||
1da177e4 LT |
1025 | /* |
1026 | * adapter presence : 1 | |
1027 | * absence : 0 | |
1028 | */ | |
1029 | u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) | |
1030 | { | |
1ad3790a | 1031 | return !!get_slot_status(slot); |
1da177e4 | 1032 | } |