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; |
ba574dc8 RW |
83 | context->hp.notify = acpiphp_hotplug_notify; |
84 | context->hp.fixup = acpiphp_post_dock_fixup; | |
85 | acpi_set_hp_context(adev, &context->hp); | |
cb7b8ced RW |
86 | return context; |
87 | } | |
88 | ||
89 | /** | |
90 | * acpiphp_get_context - Get hotplug context and grab a reference to it. | |
3c2cc7ff | 91 | * @adev: ACPI device object to get the context for. |
cb7b8ced | 92 | * |
e525506f | 93 | * Call under acpi_hp_context_lock. |
cb7b8ced | 94 | */ |
3c2cc7ff | 95 | static struct acpiphp_context *acpiphp_get_context(struct acpi_device *adev) |
cb7b8ced | 96 | { |
3c2cc7ff | 97 | struct acpiphp_context *context; |
cb7b8ced | 98 | |
3c2cc7ff RW |
99 | if (!adev->hp) |
100 | return NULL; | |
101 | ||
102 | context = to_acpiphp_context(adev->hp); | |
103 | context->refcount++; | |
cb7b8ced RW |
104 | return context; |
105 | } | |
106 | ||
107 | /** | |
108 | * acpiphp_put_context - Drop a reference to ACPI hotplug context. | |
bbcbfc0e | 109 | * @context: ACPI hotplug context to drop a reference to. |
cb7b8ced RW |
110 | * |
111 | * The context object is removed if there are no more references to it. | |
112 | * | |
e525506f | 113 | * Call under acpi_hp_context_lock. |
cb7b8ced RW |
114 | */ |
115 | static void acpiphp_put_context(struct acpiphp_context *context) | |
116 | { | |
117 | if (--context->refcount) | |
118 | return; | |
119 | ||
bd4674df | 120 | WARN_ON(context->bridge); |
3c2cc7ff | 121 | context->hp.self->hp = NULL; |
cb7b8ced RW |
122 | kfree(context); |
123 | } | |
124 | ||
3d54a316 JL |
125 | static inline void get_bridge(struct acpiphp_bridge *bridge) |
126 | { | |
127 | kref_get(&bridge->ref); | |
128 | } | |
129 | ||
130 | static inline void put_bridge(struct acpiphp_bridge *bridge) | |
131 | { | |
132 | kref_put(&bridge->ref, free_bridge); | |
133 | } | |
134 | ||
edf5bf34 RW |
135 | static struct acpiphp_context *acpiphp_grab_context(struct acpi_device *adev) |
136 | { | |
137 | struct acpiphp_context *context; | |
138 | ||
139 | acpi_lock_hp_context(); | |
140 | context = acpiphp_get_context(adev); | |
141 | if (!context || context->func.parent->is_going_away) { | |
142 | acpi_unlock_hp_context(); | |
143 | return NULL; | |
144 | } | |
145 | get_bridge(context->func.parent); | |
146 | acpiphp_put_context(context); | |
147 | acpi_unlock_hp_context(); | |
148 | return context; | |
149 | } | |
150 | ||
151 | static void acpiphp_let_context_go(struct acpiphp_context *context) | |
152 | { | |
153 | put_bridge(context->func.parent); | |
154 | } | |
155 | ||
3d54a316 JL |
156 | static void free_bridge(struct kref *kref) |
157 | { | |
cb7b8ced | 158 | struct acpiphp_context *context; |
3d54a316 JL |
159 | struct acpiphp_bridge *bridge; |
160 | struct acpiphp_slot *slot, *next; | |
161 | struct acpiphp_func *func, *tmp; | |
162 | ||
e525506f | 163 | acpi_lock_hp_context(); |
cb7b8ced | 164 | |
3d54a316 JL |
165 | bridge = container_of(kref, struct acpiphp_bridge, ref); |
166 | ||
167 | list_for_each_entry_safe(slot, next, &bridge->slots, node) { | |
bd4674df RW |
168 | list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) |
169 | acpiphp_put_context(func_to_context(func)); | |
170 | ||
3d54a316 JL |
171 | kfree(slot); |
172 | } | |
173 | ||
87831273 | 174 | context = bridge->context; |
bbd34fcd RW |
175 | /* Root bridges will not have hotplug context. */ |
176 | if (context) { | |
177 | /* Release the reference taken by acpiphp_enumerate_slots(). */ | |
bda46dbb | 178 | put_bridge(context->func.parent); |
bbd34fcd RW |
179 | context->bridge = NULL; |
180 | acpiphp_put_context(context); | |
181 | } | |
cb7b8ced | 182 | |
3d54a316 JL |
183 | put_device(&bridge->pci_bus->dev); |
184 | pci_dev_put(bridge->pci_dev); | |
185 | kfree(bridge); | |
cb7b8ced | 186 | |
e525506f | 187 | acpi_unlock_hp_context(); |
3d54a316 JL |
188 | } |
189 | ||
edf5bf34 RW |
190 | /** |
191 | * acpiphp_post_dock_fixup - Post-dock fixups for PCI devices. | |
192 | * @adev: ACPI device object corresponding to a PCI device. | |
4e8662bb | 193 | * |
edf5bf34 | 194 | * TBD - figure out a way to only call fixups for systems that require them. |
4e8662bb | 195 | */ |
edf5bf34 | 196 | static void acpiphp_post_dock_fixup(struct acpi_device *adev) |
4e8662bb | 197 | { |
edf5bf34 RW |
198 | struct acpiphp_context *context = acpiphp_grab_context(adev); |
199 | struct pci_bus *bus; | |
4e8662bb KA |
200 | u32 buses; |
201 | ||
edf5bf34 | 202 | if (!context) |
f09ce741 | 203 | return; |
4e8662bb | 204 | |
edf5bf34 RW |
205 | bus = context->func.slot->bus; |
206 | if (!bus->self) | |
207 | goto out; | |
208 | ||
4e8662bb KA |
209 | /* fixup bad _DCK function that rewrites |
210 | * secondary bridge on slot | |
211 | */ | |
edf5bf34 | 212 | pci_read_config_dword(bus->self, PCI_PRIMARY_BUS, &buses); |
4e8662bb | 213 | |
b918c62e | 214 | if (((buses >> 8) & 0xff) != bus->busn_res.start) { |
4e8662bb | 215 | buses = (buses & 0xff000000) |
2a9d3521 | 216 | | ((unsigned int)(bus->primary) << 0) |
b918c62e YL |
217 | | ((unsigned int)(bus->busn_res.start) << 8) |
218 | | ((unsigned int)(bus->busn_res.end) << 16); | |
4e8662bb KA |
219 | pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); |
220 | } | |
4e8662bb | 221 | |
edf5bf34 RW |
222 | out: |
223 | acpiphp_let_context_go(context); | |
af9d8adc | 224 | } |
4e8662bb | 225 | |
5ba113f7 JL |
226 | /* Check whether the PCI device is managed by native PCIe hotplug driver */ |
227 | static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev) | |
228 | { | |
229 | u32 reg32; | |
230 | acpi_handle tmp; | |
231 | struct acpi_pci_root *root; | |
232 | ||
233 | /* Check whether the PCIe port supports native PCIe hotplug */ | |
234 | if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32)) | |
235 | return false; | |
236 | if (!(reg32 & PCI_EXP_SLTCAP_HPC)) | |
237 | return false; | |
238 | ||
239 | /* | |
240 | * Check whether native PCIe hotplug has been enabled for | |
241 | * this PCIe hierarchy. | |
242 | */ | |
243 | tmp = acpi_find_root_bridge_handle(pdev); | |
244 | if (!tmp) | |
245 | return false; | |
246 | root = acpi_pci_find_root(tmp); | |
247 | if (!root) | |
248 | return false; | |
249 | if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) | |
250 | return false; | |
251 | ||
252 | return true; | |
253 | } | |
254 | ||
3799c5a0 RW |
255 | /** |
256 | * acpiphp_add_context - Add ACPIPHP context to an ACPI device object. | |
257 | * @handle: ACPI handle of the object to add a context to. | |
258 | * @lvl: Not used. | |
259 | * @data: The object's parent ACPIPHP bridge. | |
260 | * @rv: Not used. | |
261 | */ | |
262 | static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data, | |
263 | void **rv) | |
1da177e4 | 264 | { |
cb7b8ced RW |
265 | struct acpiphp_bridge *bridge = data; |
266 | struct acpiphp_context *context; | |
bbcbfc0e | 267 | struct acpi_device *adev; |
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 | |
dfb117b3 BH |
277 | status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); |
278 | if (ACPI_FAILURE(status)) { | |
f26ca1d6 TK |
279 | if (status != AE_NOT_FOUND) |
280 | acpi_handle_warn(handle, | |
281 | "can't evaluate _ADR (%#x)\n", status); | |
dfb117b3 BH |
282 | return AE_OK; |
283 | } | |
bbcbfc0e RW |
284 | if (acpi_bus_get_device(handle, &adev)) |
285 | return AE_OK; | |
dfb117b3 BH |
286 | |
287 | device = (adr >> 16) & 0xffff; | |
288 | function = adr & 0xffff; | |
289 | ||
e525506f | 290 | acpi_lock_hp_context(); |
bbcbfc0e | 291 | context = acpiphp_init_context(adev); |
cb7b8ced | 292 | if (!context) { |
e525506f | 293 | acpi_unlock_hp_context(); |
cb7b8ced | 294 | acpi_handle_err(handle, "No hotplug context\n"); |
cb7b8ced RW |
295 | return AE_NOT_EXIST; |
296 | } | |
bd4674df | 297 | newfunc = &context->func; |
bd4674df | 298 | newfunc->function = function; |
bda46dbb | 299 | newfunc->parent = bridge; |
edf5bf34 | 300 | acpi_unlock_hp_context(); |
cb7b8ced | 301 | |
edf5bf34 RW |
302 | /* |
303 | * If this is a dock device, its _EJ0 should be executed by the dock | |
304 | * notify handler after calling _DCK. | |
305 | */ | |
306 | if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0")) | |
20416ea5 | 307 | newfunc->flags = FUNC_HAS_EJ0; |
1da177e4 | 308 | |
ecd046da | 309 | if (acpi_has_method(handle, "_STA")) |
1da177e4 LT |
310 | newfunc->flags |= FUNC_HAS_STA; |
311 | ||
1da177e4 | 312 | /* search for objects that share the same slot */ |
ad41dd9d | 313 | list_for_each_entry(slot, &bridge->slots, node) |
bbd34fcd | 314 | if (slot->device == device) |
ac372338 | 315 | goto slot_found; |
1da177e4 | 316 | |
ac372338 RW |
317 | slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); |
318 | if (!slot) { | |
e525506f | 319 | acpi_lock_hp_context(); |
146fc68a | 320 | acpiphp_put_context(context); |
e525506f | 321 | acpi_unlock_hp_context(); |
146fc68a | 322 | return AE_NO_MEMORY; |
ac372338 RW |
323 | } |
324 | ||
bda46dbb | 325 | slot->bus = bridge->pci_bus; |
ac372338 | 326 | slot->device = device; |
ac372338 | 327 | INIT_LIST_HEAD(&slot->funcs); |
ac372338 | 328 | |
ac372338 | 329 | list_add_tail(&slot->node, &bridge->slots); |
1da177e4 | 330 | |
cc6254e0 RW |
331 | /* |
332 | * Expose slots to user space for functions that have _EJ0 or _RMV or | |
333 | * are located in dock stations. Do not expose them for devices handled | |
334 | * by the native PCIe hotplug (PCIeHP), becuase that code is supposed to | |
335 | * expose slots to user space in those cases. | |
336 | */ | |
3b52b21f | 337 | if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev)) |
cc6254e0 | 338 | && !(pdev && device_is_managed_by_native_pciehp(pdev))) { |
bbd34fcd RW |
339 | unsigned long long sun; |
340 | int retval; | |
ac372338 | 341 | |
bbd34fcd RW |
342 | bridge->nr_slots++; |
343 | status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); | |
344 | if (ACPI_FAILURE(status)) | |
345 | sun = bridge->nr_slots; | |
346 | ||
bd950799 | 347 | pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", |
7342798d | 348 | sun, pci_domain_nr(pbus), pbus->number, device); |
bbd34fcd | 349 | |
7342798d | 350 | retval = acpiphp_register_hotplug_slot(slot, sun); |
bbd34fcd | 351 | if (retval) { |
1aaac071 | 352 | slot->slot = NULL; |
bbd34fcd RW |
353 | bridge->nr_slots--; |
354 | if (retval == -EBUSY) | |
227f0647 | 355 | pr_warn("Slot %llu already registered by another hotplug driver\n", sun); |
bbd34fcd | 356 | else |
227f0647 | 357 | pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval); |
bbd34fcd RW |
358 | } |
359 | /* Even if the slot registration fails, we can still use it. */ | |
1da177e4 LT |
360 | } |
361 | ||
ac372338 | 362 | slot_found: |
1da177e4 LT |
363 | newfunc->slot = slot; |
364 | list_add_tail(&newfunc->sibling, &slot->funcs); | |
365 | ||
3b63aaa7 JL |
366 | if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), |
367 | &val, 60*1000)) | |
bc805a55 | 368 | slot->flags |= SLOT_ENABLED; |
1da177e4 | 369 | |
2e862c51 | 370 | return AE_OK; |
1da177e4 LT |
371 | } |
372 | ||
364d5094 | 373 | static void cleanup_bridge(struct acpiphp_bridge *bridge) |
1da177e4 | 374 | { |
3d54a316 JL |
375 | struct acpiphp_slot *slot; |
376 | struct acpiphp_func *func; | |
42f49a6a | 377 | |
3d54a316 JL |
378 | list_for_each_entry(slot, &bridge->slots, node) { |
379 | list_for_each_entry(func, &slot->funcs, sibling) { | |
1a699476 | 380 | struct acpi_device *adev = func_to_acpi_device(func); |
5a3bc573 | 381 | |
1a699476 | 382 | acpi_lock_hp_context(); |
be27b3dc | 383 | adev->hp->notify = NULL; |
edf5bf34 | 384 | adev->hp->fixup = NULL; |
1a699476 | 385 | acpi_unlock_hp_context(); |
42f49a6a | 386 | } |
9217a984 | 387 | slot->flags |= SLOT_IS_GOING_AWAY; |
1aaac071 RW |
388 | if (slot->slot) |
389 | acpiphp_unregister_hotplug_slot(slot); | |
42f49a6a RS |
390 | } |
391 | ||
3d54a316 | 392 | mutex_lock(&bridge_mutex); |
42f49a6a | 393 | list_del(&bridge->list); |
3d54a316 | 394 | mutex_unlock(&bridge_mutex); |
9217a984 | 395 | |
e525506f | 396 | acpi_lock_hp_context(); |
9217a984 | 397 | bridge->is_going_away = true; |
e525506f | 398 | acpi_unlock_hp_context(); |
1da177e4 LT |
399 | } |
400 | ||
15a1ae74 | 401 | /** |
26e6c66e | 402 | * acpiphp_max_busnr - return the highest reserved bus number under the given bus. |
15a1ae74 | 403 | * @bus: bus to start search with |
15a1ae74 KA |
404 | */ |
405 | static unsigned char acpiphp_max_busnr(struct pci_bus *bus) | |
406 | { | |
c6f0d5ad | 407 | struct pci_bus *tmp; |
15a1ae74 KA |
408 | unsigned char max, n; |
409 | ||
410 | /* | |
411 | * pci_bus_max_busnr will return the highest | |
412 | * reserved busnr for all these children. | |
413 | * that is equivalent to the bus->subordinate | |
414 | * value. We don't want to use the parent's | |
415 | * bus->subordinate value because it could have | |
416 | * padding in it. | |
417 | */ | |
b918c62e | 418 | max = bus->busn_res.start; |
15a1ae74 | 419 | |
c6f0d5ad YW |
420 | list_for_each_entry(tmp, &bus->children, node) { |
421 | n = pci_bus_max_busnr(tmp); | |
15a1ae74 KA |
422 | if (n > max) |
423 | max = n; | |
424 | } | |
425 | return max; | |
426 | } | |
427 | ||
d0607050 SL |
428 | static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) |
429 | { | |
430 | struct acpiphp_func *func; | |
431 | union acpi_object params[2]; | |
432 | struct acpi_object_list arg_list; | |
433 | ||
434 | list_for_each_entry(func, &slot->funcs, sibling) { | |
435 | arg_list.count = 2; | |
436 | arg_list.pointer = params; | |
437 | params[0].type = ACPI_TYPE_INTEGER; | |
438 | params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; | |
439 | params[1].type = ACPI_TYPE_INTEGER; | |
440 | params[1].integer.value = 1; | |
441 | /* _REG is optional, we don't care about if there is failure */ | |
5a3bc573 RW |
442 | acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list, |
443 | NULL); | |
d0607050 SL |
444 | } |
445 | } | |
446 | ||
1f96a965 YL |
447 | static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) |
448 | { | |
449 | struct acpiphp_func *func; | |
450 | ||
1f96a965 YL |
451 | /* quirk, or pcie could set it already */ |
452 | if (dev->is_hotplug_bridge) | |
453 | return; | |
454 | ||
1f96a965 YL |
455 | list_for_each_entry(func, &slot->funcs, sibling) { |
456 | if (PCI_FUNC(dev->devfn) == func->function) { | |
bbd34fcd | 457 | dev->is_hotplug_bridge = 1; |
1f96a965 YL |
458 | break; |
459 | } | |
460 | } | |
461 | } | |
3b63aaa7 | 462 | |
a47d8c8e RW |
463 | static int acpiphp_rescan_slot(struct acpiphp_slot *slot) |
464 | { | |
465 | struct acpiphp_func *func; | |
466 | ||
b6708fbf RW |
467 | list_for_each_entry(func, &slot->funcs, sibling) { |
468 | struct acpi_device *adev = func_to_acpi_device(func); | |
a47d8c8e | 469 | |
b6708fbf RW |
470 | acpi_bus_scan(adev->handle); |
471 | if (acpi_device_enumerated(adev)) | |
472 | acpi_device_set_power(adev, ACPI_STATE_D0); | |
473 | } | |
a47d8c8e RW |
474 | return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0)); |
475 | } | |
476 | ||
1da177e4 | 477 | /** |
a1d0abce | 478 | * enable_slot - enable, configure a slot |
1da177e4 LT |
479 | * @slot: slot to be enabled |
480 | * | |
481 | * This function should be called per *physical slot*, | |
482 | * not per each slot object in ACPI namespace. | |
1da177e4 | 483 | */ |
10874f5a | 484 | static void enable_slot(struct acpiphp_slot *slot) |
1da177e4 | 485 | { |
1da177e4 | 486 | struct pci_dev *dev; |
bda46dbb | 487 | struct pci_bus *bus = slot->bus; |
1da177e4 | 488 | struct acpiphp_func *func; |
b91182a6 | 489 | int max, pass; |
d66ecb72 | 490 | LIST_HEAD(add_list); |
1da177e4 | 491 | |
ab122590 | 492 | acpiphp_rescan_slot(slot); |
15a1ae74 | 493 | max = acpiphp_max_busnr(bus); |
42f49a6a RS |
494 | for (pass = 0; pass < 2; pass++) { |
495 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
496 | if (PCI_SLOT(dev->devfn) != slot->device) | |
497 | continue; | |
a1d0abce | 498 | |
c7a071f6 | 499 | if (pci_is_bridge(dev)) { |
42f49a6a | 500 | max = pci_scan_bridge(bus, dev, max, pass); |
1f96a965 YL |
501 | if (pass && dev->subordinate) { |
502 | check_hotplug_bridge(slot, dev); | |
d66ecb72 JL |
503 | pcibios_resource_survey_bus(dev->subordinate); |
504 | __pci_bus_size_bridges(dev->subordinate, | |
505 | &add_list); | |
1f96a965 | 506 | } |
c64b5eea | 507 | } |
42f49a6a | 508 | } |
1da177e4 | 509 | } |
d66ecb72 | 510 | __pci_bus_assign_resources(bus, &add_list, NULL); |
2dc41281 | 511 | |
8e5dce35 | 512 | acpiphp_sanitize_bus(bus); |
fca6825a | 513 | acpiphp_set_hpp_values(bus); |
d0607050 | 514 | acpiphp_set_acpi_region(slot); |
69643e48 IC |
515 | |
516 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
517 | /* Assume that newly added devices are powered on already. */ | |
518 | if (!dev->is_added) | |
519 | dev->current_state = PCI_D0; | |
520 | } | |
521 | ||
42f49a6a RS |
522 | pci_bus_add_devices(bus); |
523 | ||
f382a086 | 524 | slot->flags |= SLOT_ENABLED; |
58c08628 | 525 | list_for_each_entry(func, &slot->funcs, sibling) { |
9d911d79 AC |
526 | dev = pci_get_slot(bus, PCI_DEVFN(slot->device, |
527 | func->function)); | |
f382a086 AK |
528 | if (!dev) { |
529 | /* Do not set SLOT_ENABLED flag if some funcs | |
530 | are not added. */ | |
531 | slot->flags &= (~SLOT_ENABLED); | |
551bcb75 | 532 | continue; |
f382a086 | 533 | } |
1da177e4 | 534 | } |
1da177e4 LT |
535 | } |
536 | ||
1da177e4 | 537 | /** |
a1d0abce | 538 | * disable_slot - disable a slot |
26e6c66e | 539 | * @slot: ACPI PHP slot |
1da177e4 | 540 | */ |
a1d0abce | 541 | static void disable_slot(struct acpiphp_slot *slot) |
1da177e4 | 542 | { |
1c0c5443 RW |
543 | struct pci_bus *bus = slot->bus; |
544 | struct pci_dev *dev, *prev; | |
1da177e4 | 545 | struct acpiphp_func *func; |
551bcb75 | 546 | |
ce29ca3e | 547 | /* |
a1d0abce | 548 | * enable_slot() enumerates all functions in this device via |
ce29ca3e AK |
549 | * pci_scan_slot(), whether they have associated ACPI hotplug |
550 | * methods (_EJ0, etc.) or not. Therefore, we remove all functions | |
551 | * here. | |
552 | */ | |
1c0c5443 RW |
553 | list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list) |
554 | if (PCI_SLOT(dev->devfn) == slot->device) | |
555 | pci_stop_and_remove_bus_device(dev); | |
600812ec | 556 | |
5a3bc573 | 557 | list_for_each_entry(func, &slot->funcs, sibling) |
bbcbfc0e | 558 | acpi_bus_trim(func_to_acpi_device(func)); |
1da177e4 LT |
559 | |
560 | slot->flags &= (~SLOT_ENABLED); | |
1da177e4 LT |
561 | } |
562 | ||
f244d8b6 RW |
563 | static bool slot_no_hotplug(struct acpiphp_slot *slot) |
564 | { | |
b440bde7 BH |
565 | struct pci_bus *bus = slot->bus; |
566 | struct pci_dev *dev; | |
f244d8b6 | 567 | |
b440bde7 BH |
568 | list_for_each_entry(dev, &bus->devices, bus_list) { |
569 | if (PCI_SLOT(dev->devfn) == slot->device && dev->ignore_hotplug) | |
f244d8b6 | 570 | return true; |
b440bde7 | 571 | } |
f244d8b6 RW |
572 | return false; |
573 | } | |
1da177e4 LT |
574 | |
575 | /** | |
576 | * get_slot_status - get ACPI slot status | |
26e6c66e | 577 | * @slot: ACPI PHP slot |
1da177e4 | 578 | * |
26e6c66e RD |
579 | * If a slot has _STA for each function and if any one of them |
580 | * returned non-zero status, return it. | |
1da177e4 | 581 | * |
26e6c66e RD |
582 | * If a slot doesn't have _STA and if any one of its functions' |
583 | * configuration space is configured, return 0x0f as a _STA. | |
1da177e4 | 584 | * |
26e6c66e | 585 | * Otherwise return 0. |
1da177e4 LT |
586 | */ |
587 | static unsigned int get_slot_status(struct acpiphp_slot *slot) | |
588 | { | |
27663c58 | 589 | unsigned long long sta = 0; |
1da177e4 LT |
590 | struct acpiphp_func *func; |
591 | ||
58c08628 | 592 | list_for_each_entry(func, &slot->funcs, sibling) { |
1da177e4 | 593 | if (func->flags & FUNC_HAS_STA) { |
5a3bc573 RW |
594 | acpi_status status; |
595 | ||
596 | status = acpi_evaluate_integer(func_to_handle(func), | |
597 | "_STA", NULL, &sta); | |
1da177e4 LT |
598 | if (ACPI_SUCCESS(status) && sta) |
599 | break; | |
600 | } else { | |
5a3bc573 RW |
601 | u32 dvid; |
602 | ||
bda46dbb | 603 | pci_bus_read_config_dword(slot->bus, |
1da177e4 LT |
604 | PCI_DEVFN(slot->device, |
605 | func->function), | |
606 | PCI_VENDOR_ID, &dvid); | |
607 | if (dvid != 0xffffffff) { | |
608 | sta = ACPI_STA_ALL; | |
609 | break; | |
610 | } | |
611 | } | |
612 | } | |
613 | ||
614 | return (unsigned int)sta; | |
615 | } | |
616 | ||
72820594 MW |
617 | static inline bool device_status_valid(unsigned int sta) |
618 | { | |
619 | /* | |
620 | * ACPI spec says that _STA may return bit 0 clear with bit 3 set | |
621 | * if the device is valid but does not require a device driver to be | |
622 | * loaded (Section 6.3.7 of ACPI 5.0A). | |
623 | */ | |
624 | unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING; | |
625 | return (sta & mask) == mask; | |
626 | } | |
627 | ||
4ebe3450 RW |
628 | /** |
629 | * trim_stale_devices - remove PCI devices that are not responding. | |
630 | * @dev: PCI device to start walking the hierarchy from. | |
631 | */ | |
632 | static void trim_stale_devices(struct pci_dev *dev) | |
633 | { | |
4dc3082d | 634 | struct acpi_device *adev = ACPI_COMPANION(&dev->dev); |
4ebe3450 RW |
635 | struct pci_bus *bus = dev->subordinate; |
636 | bool alive = false; | |
637 | ||
4dc3082d | 638 | if (adev) { |
4ebe3450 RW |
639 | acpi_status status; |
640 | unsigned long long sta; | |
641 | ||
b2118d6a | 642 | status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta); |
72820594 | 643 | alive = (ACPI_SUCCESS(status) && device_status_valid(sta)) |
b440bde7 | 644 | || dev->ignore_hotplug; |
4ebe3450 | 645 | } |
b8a62d54 RW |
646 | if (!alive) |
647 | alive = pci_device_is_present(dev); | |
4ebe3450 | 648 | |
4ebe3450 RW |
649 | if (!alive) { |
650 | pci_stop_and_remove_bus_device(dev); | |
4dc3082d RW |
651 | if (adev) |
652 | acpi_bus_trim(adev); | |
4ebe3450 RW |
653 | } else if (bus) { |
654 | struct pci_dev *child, *tmp; | |
655 | ||
656 | /* The device is a bridge. so check the bus below it. */ | |
657 | pm_runtime_get_sync(&dev->dev); | |
2d7c1b77 | 658 | list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list) |
4ebe3450 RW |
659 | trim_stale_devices(child); |
660 | ||
661 | pm_runtime_put(&dev->dev); | |
662 | } | |
663 | } | |
664 | ||
1da177e4 LT |
665 | /** |
666 | * acpiphp_check_bridge - re-enumerate devices | |
26e6c66e | 667 | * @bridge: where to begin re-enumeration |
1da177e4 LT |
668 | * |
669 | * Iterate over all slots under this bridge and make sure that if a | |
670 | * card is present they are enabled, and if not they are disabled. | |
671 | */ | |
4ebe3450 | 672 | static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) |
1da177e4 LT |
673 | { |
674 | struct acpiphp_slot *slot; | |
1da177e4 | 675 | |
9217a984 RW |
676 | /* Bail out if the bridge is going away. */ |
677 | if (bridge->is_going_away) | |
678 | return; | |
679 | ||
ad41dd9d | 680 | list_for_each_entry(slot, &bridge->slots, node) { |
4ebe3450 RW |
681 | struct pci_bus *bus = slot->bus; |
682 | struct pci_dev *dev, *tmp; | |
683 | ||
f244d8b6 RW |
684 | if (slot_no_hotplug(slot)) { |
685 | ; /* do nothing */ | |
72820594 | 686 | } else if (device_status_valid(get_slot_status(slot))) { |
4ebe3450 | 687 | /* remove stale devices if any */ |
2d7c1b77 RW |
688 | list_for_each_entry_safe_reverse(dev, tmp, |
689 | &bus->devices, bus_list) | |
4ebe3450 RW |
690 | if (PCI_SLOT(dev->devfn) == slot->device) |
691 | trim_stale_devices(dev); | |
692 | ||
693 | /* configure all functions */ | |
a1d0abce | 694 | enable_slot(slot); |
1da177e4 | 695 | } else { |
a1d0abce | 696 | disable_slot(slot); |
1da177e4 LT |
697 | } |
698 | } | |
1da177e4 LT |
699 | } |
700 | ||
fca6825a | 701 | static void acpiphp_set_hpp_values(struct pci_bus *bus) |
8e7561cf | 702 | { |
8e7561cf RS |
703 | struct pci_dev *dev; |
704 | ||
e81995bb BH |
705 | list_for_each_entry(dev, &bus->devices, bus_list) |
706 | pci_configure_slot(dev); | |
8e7561cf RS |
707 | } |
708 | ||
709 | /* | |
710 | * Remove devices for which we could not assign resources, call | |
711 | * arch specific code to fix-up the bus | |
712 | */ | |
713 | static void acpiphp_sanitize_bus(struct pci_bus *bus) | |
714 | { | |
d65eba6a | 715 | struct pci_dev *dev, *tmp; |
8e7561cf RS |
716 | int i; |
717 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; | |
718 | ||
2d7c1b77 | 719 | list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) { |
8e7561cf RS |
720 | for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { |
721 | struct resource *res = &dev->resource[i]; | |
722 | if ((res->flags & type_mask) && !res->start && | |
723 | res->end) { | |
724 | /* Could not assign a required resources | |
725 | * for this device, remove it */ | |
210647af | 726 | pci_stop_and_remove_bus_device(dev); |
8e7561cf RS |
727 | break; |
728 | } | |
729 | } | |
730 | } | |
731 | } | |
732 | ||
1da177e4 LT |
733 | /* |
734 | * ACPI event handlers | |
735 | */ | |
736 | ||
1f7c164b | 737 | void acpiphp_check_host_bridge(struct acpi_device *adev) |
3f327e39 | 738 | { |
86f5f3ca | 739 | struct acpiphp_bridge *bridge = NULL; |
3f327e39 | 740 | |
86f5f3ca RW |
741 | acpi_lock_hp_context(); |
742 | if (adev->hp) { | |
743 | bridge = to_acpiphp_root_context(adev->hp)->root_bridge; | |
744 | if (bridge) | |
745 | get_bridge(bridge); | |
746 | } | |
747 | acpi_unlock_hp_context(); | |
3f327e39 | 748 | if (bridge) { |
d42f5da2 RW |
749 | pci_lock_rescan_remove(); |
750 | ||
3f327e39 | 751 | acpiphp_check_bridge(bridge); |
d42f5da2 RW |
752 | |
753 | pci_unlock_rescan_remove(); | |
3f327e39 YL |
754 | put_bridge(bridge); |
755 | } | |
3f327e39 YL |
756 | } |
757 | ||
9217a984 RW |
758 | static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot); |
759 | ||
d3a1ebb0 | 760 | static void hotplug_event(u32 type, struct acpiphp_context *context) |
1da177e4 | 761 | { |
3c2cc7ff | 762 | acpi_handle handle = context->hp.self->handle; |
bd4674df | 763 | struct acpiphp_func *func = &context->func; |
b75cece1 | 764 | struct acpiphp_slot *slot = func->slot; |
1da177e4 | 765 | struct acpiphp_bridge *bridge; |
6af8bef1 | 766 | |
e525506f | 767 | acpi_lock_hp_context(); |
c8ebcf1f | 768 | bridge = context->bridge; |
43e5c091 RW |
769 | if (bridge) |
770 | get_bridge(bridge); | |
1da177e4 | 771 | |
e525506f | 772 | acpi_unlock_hp_context(); |
3757b948 | 773 | |
f41b3261 | 774 | pci_lock_rescan_remove(); |
1da177e4 LT |
775 | |
776 | switch (type) { | |
777 | case ACPI_NOTIFY_BUS_CHECK: | |
778 | /* bus re-enumerate */ | |
1d4a5b61 | 779 | acpi_handle_debug(handle, "Bus check in %s()\n", __func__); |
b75cece1 | 780 | if (bridge) |
43e5c091 | 781 | acpiphp_check_bridge(bridge); |
b75cece1 | 782 | else if (!(slot->flags & SLOT_IS_GOING_AWAY)) |
a1d0abce | 783 | enable_slot(slot); |
4ebe3450 | 784 | |
1da177e4 LT |
785 | break; |
786 | ||
787 | case ACPI_NOTIFY_DEVICE_CHECK: | |
788 | /* device check */ | |
1d4a5b61 | 789 | acpi_handle_debug(handle, "Device check in %s()\n", __func__); |
a47d8c8e | 790 | if (bridge) { |
43e5c091 | 791 | acpiphp_check_bridge(bridge); |
b75cece1 | 792 | } else if (!(slot->flags & SLOT_IS_GOING_AWAY)) { |
a47d8c8e RW |
793 | /* |
794 | * Check if anything has changed in the slot and rescan | |
795 | * from the parent if that's the case. | |
796 | */ | |
661b4064 | 797 | if (acpiphp_rescan_slot(slot)) |
a47d8c8e RW |
798 | acpiphp_check_bridge(func->parent); |
799 | } | |
1da177e4 LT |
800 | break; |
801 | ||
1da177e4 LT |
802 | case ACPI_NOTIFY_EJECT_REQUEST: |
803 | /* request device eject */ | |
1d4a5b61 | 804 | acpi_handle_debug(handle, "Eject request in %s()\n", __func__); |
b75cece1 | 805 | acpiphp_disable_and_eject_slot(slot); |
1da177e4 | 806 | break; |
1da177e4 | 807 | } |
6af8bef1 | 808 | |
f41b3261 | 809 | pci_unlock_rescan_remove(); |
43e5c091 RW |
810 | if (bridge) |
811 | put_bridge(bridge); | |
21a31013 RW |
812 | } |
813 | ||
be27b3dc | 814 | static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type) |
6af8bef1 | 815 | { |
87831273 | 816 | struct acpiphp_context *context; |
87831273 | 817 | |
edf5bf34 RW |
818 | context = acpiphp_grab_context(adev); |
819 | if (!context) | |
3c2cc7ff | 820 | return -ENODATA; |
1b360f44 | 821 | |
3c2cc7ff | 822 | hotplug_event(type, context); |
edf5bf34 | 823 | acpiphp_let_context_go(context); |
3c2cc7ff | 824 | return 0; |
8e7561cf | 825 | } |
1da177e4 | 826 | |
454481ad RW |
827 | /** |
828 | * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus. | |
829 | * @bus: PCI bus to enumerate the slots for. | |
830 | * | |
831 | * A "slot" is an object associated with a PCI device number. All functions | |
832 | * (PCI devices) with the same bus and device number belong to the same slot. | |
1da177e4 | 833 | */ |
be1c9de9 | 834 | void acpiphp_enumerate_slots(struct pci_bus *bus) |
1da177e4 | 835 | { |
3b63aaa7 | 836 | struct acpiphp_bridge *bridge; |
bbcbfc0e | 837 | struct acpi_device *adev; |
2552002a RW |
838 | acpi_handle handle; |
839 | acpi_status status; | |
1da177e4 | 840 | |
3b63aaa7 JL |
841 | if (acpiphp_disabled) |
842 | return; | |
1da177e4 | 843 | |
bbcbfc0e RW |
844 | adev = ACPI_COMPANION(bus->bridge); |
845 | if (!adev) | |
3b63aaa7 | 846 | return; |
1da177e4 | 847 | |
bbcbfc0e | 848 | handle = adev->handle; |
3b63aaa7 | 849 | bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); |
cb7b8ced RW |
850 | if (!bridge) { |
851 | acpi_handle_err(handle, "No memory for bridge object\n"); | |
3b63aaa7 JL |
852 | return; |
853 | } | |
854 | ||
ad41dd9d | 855 | INIT_LIST_HEAD(&bridge->slots); |
3d54a316 | 856 | kref_init(&bridge->ref); |
3b63aaa7 JL |
857 | bridge->pci_dev = pci_dev_get(bus->self); |
858 | bridge->pci_bus = bus; | |
859 | ||
860 | /* | |
861 | * Grab a ref to the subordinate PCI bus in case the bus is | |
862 | * removed via PCI core logical hotplug. The ref pins the bus | |
863 | * (which we access during module unload). | |
864 | */ | |
865 | get_device(&bus->dev); | |
866 | ||
882d18a7 RW |
867 | acpi_lock_hp_context(); |
868 | if (pci_is_root_bus(bridge->pci_bus)) { | |
869 | struct acpiphp_root_context *root_context; | |
870 | ||
871 | root_context = kzalloc(sizeof(*root_context), GFP_KERNEL); | |
872 | if (!root_context) | |
873 | goto err; | |
874 | ||
875 | root_context->root_bridge = bridge; | |
ba574dc8 | 876 | acpi_set_hp_context(adev, &root_context->hp); |
882d18a7 | 877 | } else { |
bbd34fcd RW |
878 | struct acpiphp_context *context; |
879 | ||
880 | /* | |
881 | * This bridge should have been registered as a hotplug function | |
fd3cfebe RW |
882 | * under its parent, so the context should be there, unless the |
883 | * parent is going to be handled by pciehp, in which case this | |
884 | * bridge is not interesting to us either. | |
bbd34fcd | 885 | */ |
3c2cc7ff | 886 | context = acpiphp_get_context(adev); |
882d18a7 RW |
887 | if (!context) |
888 | goto err; | |
889 | ||
bbd34fcd RW |
890 | bridge->context = context; |
891 | context->bridge = bridge; | |
892 | /* Get a reference to the parent bridge. */ | |
bda46dbb | 893 | get_bridge(context->func.parent); |
bbd34fcd | 894 | } |
882d18a7 | 895 | acpi_unlock_hp_context(); |
bbd34fcd | 896 | |
3799c5a0 | 897 | /* Must be added to the list prior to calling acpiphp_add_context(). */ |
2552002a RW |
898 | mutex_lock(&bridge_mutex); |
899 | list_add(&bridge->list, &bridge_list); | |
900 | mutex_unlock(&bridge_mutex); | |
901 | ||
902 | /* register all slot objects under this bridge */ | |
89373a55 | 903 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, |
3799c5a0 | 904 | acpiphp_add_context, NULL, bridge, NULL); |
2552002a | 905 | if (ACPI_FAILURE(status)) { |
89373a55 | 906 | acpi_handle_err(handle, "failed to register slots\n"); |
bbd34fcd RW |
907 | cleanup_bridge(bridge); |
908 | put_bridge(bridge); | |
2552002a | 909 | } |
882d18a7 RW |
910 | return; |
911 | ||
912 | err: | |
913 | acpi_unlock_hp_context(); | |
914 | put_device(&bus->dev); | |
915 | pci_dev_put(bridge->pci_dev); | |
916 | kfree(bridge); | |
917 | } | |
918 | ||
902ee490 | 919 | static void acpiphp_drop_bridge(struct acpiphp_bridge *bridge) |
882d18a7 RW |
920 | { |
921 | if (pci_is_root_bus(bridge->pci_bus)) { | |
922 | struct acpiphp_root_context *root_context; | |
923 | struct acpi_device *adev; | |
924 | ||
925 | acpi_lock_hp_context(); | |
926 | adev = ACPI_COMPANION(bridge->pci_bus->bridge); | |
927 | root_context = to_acpiphp_root_context(adev->hp); | |
928 | adev->hp = NULL; | |
929 | acpi_unlock_hp_context(); | |
930 | kfree(root_context); | |
931 | } | |
932 | cleanup_bridge(bridge); | |
933 | put_bridge(bridge); | |
3b63aaa7 JL |
934 | } |
935 | ||
454481ad RW |
936 | /** |
937 | * acpiphp_remove_slots - Remove slot objects associated with a given bus. | |
938 | * @bus: PCI bus to remove the slot objects for. | |
939 | */ | |
3b63aaa7 | 940 | void acpiphp_remove_slots(struct pci_bus *bus) |
1da177e4 | 941 | { |
ff181e5a | 942 | struct acpiphp_bridge *bridge; |
3b63aaa7 JL |
943 | |
944 | if (acpiphp_disabled) | |
945 | return; | |
946 | ||
ff181e5a RW |
947 | mutex_lock(&bridge_mutex); |
948 | list_for_each_entry(bridge, &bridge_list, list) | |
3b63aaa7 | 949 | if (bridge->pci_bus == bus) { |
ff181e5a | 950 | mutex_unlock(&bridge_mutex); |
882d18a7 | 951 | acpiphp_drop_bridge(bridge); |
ff181e5a | 952 | return; |
3b63aaa7 | 953 | } |
ff181e5a RW |
954 | |
955 | mutex_unlock(&bridge_mutex); | |
1da177e4 LT |
956 | } |
957 | ||
1da177e4 LT |
958 | /** |
959 | * acpiphp_enable_slot - power on slot | |
26e6c66e | 960 | * @slot: ACPI PHP slot |
1da177e4 LT |
961 | */ |
962 | int acpiphp_enable_slot(struct acpiphp_slot *slot) | |
963 | { | |
9217a984 RW |
964 | pci_lock_rescan_remove(); |
965 | ||
966 | if (slot->flags & SLOT_IS_GOING_AWAY) | |
967 | return -ENODEV; | |
968 | ||
bc805a55 | 969 | /* configure all functions */ |
55502ddb | 970 | if (!(slot->flags & SLOT_ENABLED)) |
a1d0abce | 971 | enable_slot(slot); |
55502ddb | 972 | |
9217a984 | 973 | pci_unlock_rescan_remove(); |
a1d0abce | 974 | return 0; |
1da177e4 LT |
975 | } |
976 | ||
1da177e4 | 977 | /** |
ad21d2d0 | 978 | * acpiphp_disable_and_eject_slot - power off and eject slot |
26e6c66e | 979 | * @slot: ACPI PHP slot |
1da177e4 | 980 | */ |
9217a984 | 981 | static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) |
1da177e4 | 982 | { |
ad21d2d0 | 983 | struct acpiphp_func *func; |
9217a984 RW |
984 | |
985 | if (slot->flags & SLOT_IS_GOING_AWAY) | |
986 | return -ENODEV; | |
1da177e4 | 987 | |
1da177e4 | 988 | /* unconfigure all functions */ |
a1d0abce | 989 | disable_slot(slot); |
1da177e4 | 990 | |
ad21d2d0 MW |
991 | list_for_each_entry(func, &slot->funcs, sibling) |
992 | if (func->flags & FUNC_HAS_EJ0) { | |
993 | acpi_handle handle = func_to_handle(func); | |
994 | ||
995 | if (ACPI_FAILURE(acpi_evaluate_ej0(handle))) | |
996 | acpi_handle_err(handle, "_EJ0 failed\n"); | |
997 | ||
998 | break; | |
999 | } | |
1000 | ||
9217a984 | 1001 | return 0; |
1da177e4 LT |
1002 | } |
1003 | ||
9217a984 RW |
1004 | int acpiphp_disable_slot(struct acpiphp_slot *slot) |
1005 | { | |
1006 | int ret; | |
1007 | ||
21369c77 RW |
1008 | /* |
1009 | * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in | |
1010 | * acpiphp_disable_and_eject_slot() will be synchronized properly. | |
1011 | */ | |
1012 | acpi_scan_lock_acquire(); | |
9217a984 RW |
1013 | pci_lock_rescan_remove(); |
1014 | ret = acpiphp_disable_and_eject_slot(slot); | |
1015 | pci_unlock_rescan_remove(); | |
21369c77 | 1016 | acpi_scan_lock_release(); |
9217a984 RW |
1017 | return ret; |
1018 | } | |
1da177e4 LT |
1019 | |
1020 | /* | |
1021 | * slot enabled: 1 | |
1022 | * slot disabled: 0 | |
1023 | */ | |
1024 | u8 acpiphp_get_power_status(struct acpiphp_slot *slot) | |
1025 | { | |
bc805a55 | 1026 | return (slot->flags & SLOT_ENABLED); |
1da177e4 LT |
1027 | } |
1028 | ||
1da177e4 | 1029 | /* |
35ae61a0 MT |
1030 | * latch open: 1 |
1031 | * latch closed: 0 | |
1da177e4 LT |
1032 | */ |
1033 | u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) | |
1034 | { | |
1ad3790a | 1035 | return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); |
1da177e4 LT |
1036 | } |
1037 | ||
1da177e4 LT |
1038 | /* |
1039 | * adapter presence : 1 | |
1040 | * absence : 0 | |
1041 | */ | |
1042 | u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) | |
1043 | { | |
1ad3790a | 1044 | return !!get_slot_status(slot); |
1da177e4 | 1045 | } |