| 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 |
| 7 | * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com) |
| 8 | * Copyright (C) 2003-2005 Hewlett Packard |
| 9 | * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com) |
| 10 | * Copyright (C) 2005 Intel Corporation |
| 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 | * |
| 29 | * Send feedback to <kristen.c.accardi@intel.com> |
| 30 | * |
| 31 | */ |
| 32 | |
| 33 | /* |
| 34 | * Lifetime rules for pci_dev: |
| 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. |
| 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. |
| 40 | */ |
| 41 | |
| 42 | #define pr_fmt(fmt) "acpiphp_glue: " fmt |
| 43 | |
| 44 | #include <linux/init.h> |
| 45 | #include <linux/module.h> |
| 46 | |
| 47 | #include <linux/kernel.h> |
| 48 | #include <linux/pci.h> |
| 49 | #include <linux/pci_hotplug.h> |
| 50 | #include <linux/pci-acpi.h> |
| 51 | #include <linux/pm_runtime.h> |
| 52 | #include <linux/mutex.h> |
| 53 | #include <linux/slab.h> |
| 54 | #include <linux/acpi.h> |
| 55 | |
| 56 | #include "../pci.h" |
| 57 | #include "acpiphp.h" |
| 58 | |
| 59 | static LIST_HEAD(bridge_list); |
| 60 | static DEFINE_MUTEX(bridge_mutex); |
| 61 | static DEFINE_MUTEX(acpiphp_context_lock); |
| 62 | |
| 63 | static void handle_hotplug_event(acpi_handle handle, u32 type, void *data); |
| 64 | static void acpiphp_sanitize_bus(struct pci_bus *bus); |
| 65 | static void acpiphp_set_hpp_values(struct pci_bus *bus); |
| 66 | static void hotplug_event(acpi_handle handle, u32 type, void *data); |
| 67 | static void free_bridge(struct kref *kref); |
| 68 | |
| 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 | |
| 132 | WARN_ON(context->bridge); |
| 133 | acpi_detach_data(context->handle, acpiphp_context_handler); |
| 134 | kfree(context); |
| 135 | } |
| 136 | |
| 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 | { |
| 149 | struct acpiphp_context *context; |
| 150 | struct acpiphp_bridge *bridge; |
| 151 | struct acpiphp_slot *slot, *next; |
| 152 | struct acpiphp_func *func, *tmp; |
| 153 | |
| 154 | mutex_lock(&acpiphp_context_lock); |
| 155 | |
| 156 | bridge = container_of(kref, struct acpiphp_bridge, ref); |
| 157 | |
| 158 | list_for_each_entry_safe(slot, next, &bridge->slots, node) { |
| 159 | list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) |
| 160 | acpiphp_put_context(func_to_context(func)); |
| 161 | |
| 162 | kfree(slot); |
| 163 | } |
| 164 | |
| 165 | context = bridge->context; |
| 166 | /* Root bridges will not have hotplug context. */ |
| 167 | if (context) { |
| 168 | /* Release the reference taken by acpiphp_enumerate_slots(). */ |
| 169 | put_bridge(context->func.parent); |
| 170 | context->bridge = NULL; |
| 171 | acpiphp_put_context(context); |
| 172 | } |
| 173 | |
| 174 | put_device(&bridge->pci_bus->dev); |
| 175 | pci_dev_put(bridge->pci_dev); |
| 176 | kfree(bridge); |
| 177 | |
| 178 | mutex_unlock(&acpiphp_context_lock); |
| 179 | } |
| 180 | |
| 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 | */ |
| 188 | static void post_dock_fixups(acpi_handle not_used, u32 event, void *data) |
| 189 | { |
| 190 | struct acpiphp_context *context = data; |
| 191 | struct pci_bus *bus = context->func.slot->bus; |
| 192 | u32 buses; |
| 193 | |
| 194 | if (!bus->self) |
| 195 | return; |
| 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 | |
| 204 | if (((buses >> 8) & 0xff) != bus->busn_res.start) { |
| 205 | buses = (buses & 0xff000000) |
| 206 | | ((unsigned int)(bus->primary) << 0) |
| 207 | | ((unsigned int)(bus->busn_res.start) << 8) |
| 208 | | ((unsigned int)(bus->busn_res.end) << 16); |
| 209 | pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | static void dock_event(acpi_handle handle, u32 type, void *data) |
| 214 | { |
| 215 | struct acpiphp_context *context; |
| 216 | |
| 217 | mutex_lock(&acpiphp_context_lock); |
| 218 | context = acpiphp_get_context(handle); |
| 219 | if (!context || WARN_ON(context->handle != handle) |
| 220 | || context->func.parent->is_going_away) { |
| 221 | mutex_unlock(&acpiphp_context_lock); |
| 222 | return; |
| 223 | } |
| 224 | get_bridge(context->func.parent); |
| 225 | acpiphp_put_context(context); |
| 226 | mutex_unlock(&acpiphp_context_lock); |
| 227 | |
| 228 | hotplug_event(handle, type, data); |
| 229 | |
| 230 | put_bridge(context->func.parent); |
| 231 | } |
| 232 | |
| 233 | static const struct acpi_dock_ops acpiphp_dock_ops = { |
| 234 | .fixup = post_dock_fixups, |
| 235 | .handler = dock_event, |
| 236 | }; |
| 237 | |
| 238 | /* Check whether the PCI device is managed by native PCIe hotplug driver */ |
| 239 | static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev) |
| 240 | { |
| 241 | u32 reg32; |
| 242 | acpi_handle tmp; |
| 243 | struct acpi_pci_root *root; |
| 244 | |
| 245 | /* Check whether the PCIe port supports native PCIe hotplug */ |
| 246 | if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32)) |
| 247 | return false; |
| 248 | if (!(reg32 & PCI_EXP_SLTCAP_HPC)) |
| 249 | return false; |
| 250 | |
| 251 | /* |
| 252 | * Check whether native PCIe hotplug has been enabled for |
| 253 | * this PCIe hierarchy. |
| 254 | */ |
| 255 | tmp = acpi_find_root_bridge_handle(pdev); |
| 256 | if (!tmp) |
| 257 | return false; |
| 258 | root = acpi_pci_find_root(tmp); |
| 259 | if (!root) |
| 260 | return false; |
| 261 | if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) |
| 262 | return false; |
| 263 | |
| 264 | return true; |
| 265 | } |
| 266 | |
| 267 | static void acpiphp_dock_init(void *data) |
| 268 | { |
| 269 | struct acpiphp_context *context = data; |
| 270 | |
| 271 | get_bridge(context->func.parent); |
| 272 | } |
| 273 | |
| 274 | static void acpiphp_dock_release(void *data) |
| 275 | { |
| 276 | struct acpiphp_context *context = data; |
| 277 | |
| 278 | put_bridge(context->func.parent); |
| 279 | } |
| 280 | |
| 281 | /* callback routine to register each ACPI PCI slot object */ |
| 282 | static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data, |
| 283 | void **rv) |
| 284 | { |
| 285 | struct acpiphp_bridge *bridge = data; |
| 286 | struct acpiphp_context *context; |
| 287 | struct acpiphp_slot *slot; |
| 288 | struct acpiphp_func *newfunc; |
| 289 | acpi_status status = AE_OK; |
| 290 | unsigned long long adr; |
| 291 | int device, function; |
| 292 | struct pci_bus *pbus = bridge->pci_bus; |
| 293 | struct pci_dev *pdev = bridge->pci_dev; |
| 294 | u32 val; |
| 295 | |
| 296 | if (pdev && device_is_managed_by_native_pciehp(pdev)) |
| 297 | return AE_OK; |
| 298 | |
| 299 | status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); |
| 300 | if (ACPI_FAILURE(status)) { |
| 301 | if (status != AE_NOT_FOUND) |
| 302 | acpi_handle_warn(handle, |
| 303 | "can't evaluate _ADR (%#x)\n", status); |
| 304 | return AE_OK; |
| 305 | } |
| 306 | |
| 307 | device = (adr >> 16) & 0xffff; |
| 308 | function = adr & 0xffff; |
| 309 | |
| 310 | mutex_lock(&acpiphp_context_lock); |
| 311 | context = acpiphp_init_context(handle); |
| 312 | if (!context) { |
| 313 | mutex_unlock(&acpiphp_context_lock); |
| 314 | acpi_handle_err(handle, "No hotplug context\n"); |
| 315 | return AE_NOT_EXIST; |
| 316 | } |
| 317 | newfunc = &context->func; |
| 318 | newfunc->function = function; |
| 319 | newfunc->parent = bridge; |
| 320 | mutex_unlock(&acpiphp_context_lock); |
| 321 | |
| 322 | if (acpi_has_method(handle, "_EJ0")) |
| 323 | newfunc->flags = FUNC_HAS_EJ0; |
| 324 | |
| 325 | if (acpi_has_method(handle, "_STA")) |
| 326 | newfunc->flags |= FUNC_HAS_STA; |
| 327 | |
| 328 | if (acpi_has_method(handle, "_DCK")) |
| 329 | newfunc->flags |= FUNC_HAS_DCK; |
| 330 | |
| 331 | /* search for objects that share the same slot */ |
| 332 | list_for_each_entry(slot, &bridge->slots, node) |
| 333 | if (slot->device == device) |
| 334 | goto slot_found; |
| 335 | |
| 336 | slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); |
| 337 | if (!slot) { |
| 338 | status = AE_NO_MEMORY; |
| 339 | goto err; |
| 340 | } |
| 341 | |
| 342 | slot->bus = bridge->pci_bus; |
| 343 | slot->device = device; |
| 344 | INIT_LIST_HEAD(&slot->funcs); |
| 345 | mutex_init(&slot->crit_sect); |
| 346 | |
| 347 | list_add_tail(&slot->node, &bridge->slots); |
| 348 | |
| 349 | /* Register slots for ejectable functions only. */ |
| 350 | if (acpi_pci_check_ejectable(pbus, handle) || is_dock_device(handle)) { |
| 351 | unsigned long long sun; |
| 352 | int retval; |
| 353 | |
| 354 | bridge->nr_slots++; |
| 355 | status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); |
| 356 | if (ACPI_FAILURE(status)) |
| 357 | sun = bridge->nr_slots; |
| 358 | |
| 359 | pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", |
| 360 | sun, pci_domain_nr(pbus), pbus->number, device); |
| 361 | |
| 362 | retval = acpiphp_register_hotplug_slot(slot, sun); |
| 363 | if (retval) { |
| 364 | slot->slot = NULL; |
| 365 | bridge->nr_slots--; |
| 366 | if (retval == -EBUSY) |
| 367 | pr_warn("Slot %llu already registered by another " |
| 368 | "hotplug driver\n", sun); |
| 369 | else |
| 370 | pr_warn("acpiphp_register_hotplug_slot failed " |
| 371 | "(err code = 0x%x)\n", retval); |
| 372 | } |
| 373 | /* Even if the slot registration fails, we can still use it. */ |
| 374 | } |
| 375 | |
| 376 | slot_found: |
| 377 | newfunc->slot = slot; |
| 378 | list_add_tail(&newfunc->sibling, &slot->funcs); |
| 379 | |
| 380 | if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), |
| 381 | &val, 60*1000)) |
| 382 | slot->flags |= SLOT_ENABLED; |
| 383 | |
| 384 | if (is_dock_device(handle)) { |
| 385 | /* we don't want to call this device's _EJ0 |
| 386 | * because we want the dock notify handler |
| 387 | * to call it after it calls _DCK |
| 388 | */ |
| 389 | newfunc->flags &= ~FUNC_HAS_EJ0; |
| 390 | if (register_hotplug_dock_device(handle, |
| 391 | &acpiphp_dock_ops, context, |
| 392 | acpiphp_dock_init, acpiphp_dock_release)) |
| 393 | pr_debug("failed to register dock device\n"); |
| 394 | } |
| 395 | |
| 396 | /* install notify handler */ |
| 397 | if (!(newfunc->flags & FUNC_HAS_DCK)) { |
| 398 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
| 399 | handle_hotplug_event, |
| 400 | context); |
| 401 | if (ACPI_FAILURE(status)) |
| 402 | acpi_handle_err(handle, |
| 403 | "failed to install notify handler\n"); |
| 404 | } |
| 405 | |
| 406 | return AE_OK; |
| 407 | |
| 408 | err: |
| 409 | mutex_lock(&acpiphp_context_lock); |
| 410 | acpiphp_put_context(context); |
| 411 | mutex_unlock(&acpiphp_context_lock); |
| 412 | return status; |
| 413 | } |
| 414 | |
| 415 | static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) |
| 416 | { |
| 417 | struct acpiphp_context *context; |
| 418 | struct acpiphp_bridge *bridge = NULL; |
| 419 | |
| 420 | mutex_lock(&acpiphp_context_lock); |
| 421 | context = acpiphp_get_context(handle); |
| 422 | if (context) { |
| 423 | bridge = context->bridge; |
| 424 | if (bridge) |
| 425 | get_bridge(bridge); |
| 426 | |
| 427 | acpiphp_put_context(context); |
| 428 | } |
| 429 | mutex_unlock(&acpiphp_context_lock); |
| 430 | return bridge; |
| 431 | } |
| 432 | |
| 433 | static void cleanup_bridge(struct acpiphp_bridge *bridge) |
| 434 | { |
| 435 | struct acpiphp_slot *slot; |
| 436 | struct acpiphp_func *func; |
| 437 | acpi_status status; |
| 438 | |
| 439 | list_for_each_entry(slot, &bridge->slots, node) { |
| 440 | list_for_each_entry(func, &slot->funcs, sibling) { |
| 441 | acpi_handle handle = func_to_handle(func); |
| 442 | |
| 443 | if (is_dock_device(handle)) |
| 444 | unregister_hotplug_dock_device(handle); |
| 445 | |
| 446 | if (!(func->flags & FUNC_HAS_DCK)) { |
| 447 | status = acpi_remove_notify_handler(handle, |
| 448 | ACPI_SYSTEM_NOTIFY, |
| 449 | handle_hotplug_event); |
| 450 | if (ACPI_FAILURE(status)) |
| 451 | pr_err("failed to remove notify handler\n"); |
| 452 | } |
| 453 | } |
| 454 | slot->flags |= SLOT_IS_GOING_AWAY; |
| 455 | if (slot->slot) |
| 456 | acpiphp_unregister_hotplug_slot(slot); |
| 457 | } |
| 458 | |
| 459 | mutex_lock(&bridge_mutex); |
| 460 | list_del(&bridge->list); |
| 461 | mutex_unlock(&bridge_mutex); |
| 462 | |
| 463 | mutex_lock(&acpiphp_context_lock); |
| 464 | bridge->is_going_away = true; |
| 465 | mutex_unlock(&acpiphp_context_lock); |
| 466 | } |
| 467 | |
| 468 | /** |
| 469 | * acpiphp_max_busnr - return the highest reserved bus number under the given bus. |
| 470 | * @bus: bus to start search with |
| 471 | */ |
| 472 | static unsigned char acpiphp_max_busnr(struct pci_bus *bus) |
| 473 | { |
| 474 | struct list_head *tmp; |
| 475 | unsigned char max, n; |
| 476 | |
| 477 | /* |
| 478 | * pci_bus_max_busnr will return the highest |
| 479 | * reserved busnr for all these children. |
| 480 | * that is equivalent to the bus->subordinate |
| 481 | * value. We don't want to use the parent's |
| 482 | * bus->subordinate value because it could have |
| 483 | * padding in it. |
| 484 | */ |
| 485 | max = bus->busn_res.start; |
| 486 | |
| 487 | list_for_each(tmp, &bus->children) { |
| 488 | n = pci_bus_max_busnr(pci_bus_b(tmp)); |
| 489 | if (n > max) |
| 490 | max = n; |
| 491 | } |
| 492 | return max; |
| 493 | } |
| 494 | |
| 495 | /** |
| 496 | * acpiphp_bus_trim - Trim device objects in an ACPI namespace subtree. |
| 497 | * @handle: ACPI device object handle to start from. |
| 498 | */ |
| 499 | static void acpiphp_bus_trim(acpi_handle handle) |
| 500 | { |
| 501 | struct acpi_device *adev = NULL; |
| 502 | |
| 503 | acpi_bus_get_device(handle, &adev); |
| 504 | if (adev) |
| 505 | acpi_bus_trim(adev); |
| 506 | } |
| 507 | |
| 508 | /** |
| 509 | * acpiphp_bus_add - Scan ACPI namespace subtree. |
| 510 | * @handle: ACPI object handle to start the scan from. |
| 511 | */ |
| 512 | static void acpiphp_bus_add(acpi_handle handle) |
| 513 | { |
| 514 | struct acpi_device *adev = NULL; |
| 515 | |
| 516 | acpi_bus_scan(handle); |
| 517 | acpi_bus_get_device(handle, &adev); |
| 518 | if (acpi_device_enumerated(adev)) |
| 519 | acpi_device_set_power(adev, ACPI_STATE_D0); |
| 520 | } |
| 521 | |
| 522 | static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) |
| 523 | { |
| 524 | struct acpiphp_func *func; |
| 525 | union acpi_object params[2]; |
| 526 | struct acpi_object_list arg_list; |
| 527 | |
| 528 | list_for_each_entry(func, &slot->funcs, sibling) { |
| 529 | arg_list.count = 2; |
| 530 | arg_list.pointer = params; |
| 531 | params[0].type = ACPI_TYPE_INTEGER; |
| 532 | params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; |
| 533 | params[1].type = ACPI_TYPE_INTEGER; |
| 534 | params[1].integer.value = 1; |
| 535 | /* _REG is optional, we don't care about if there is failure */ |
| 536 | acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list, |
| 537 | NULL); |
| 538 | } |
| 539 | } |
| 540 | |
| 541 | static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) |
| 542 | { |
| 543 | struct acpiphp_func *func; |
| 544 | |
| 545 | /* quirk, or pcie could set it already */ |
| 546 | if (dev->is_hotplug_bridge) |
| 547 | return; |
| 548 | |
| 549 | list_for_each_entry(func, &slot->funcs, sibling) { |
| 550 | if (PCI_FUNC(dev->devfn) == func->function) { |
| 551 | dev->is_hotplug_bridge = 1; |
| 552 | break; |
| 553 | } |
| 554 | } |
| 555 | } |
| 556 | |
| 557 | static int acpiphp_rescan_slot(struct acpiphp_slot *slot) |
| 558 | { |
| 559 | struct acpiphp_func *func; |
| 560 | |
| 561 | list_for_each_entry(func, &slot->funcs, sibling) |
| 562 | acpiphp_bus_add(func_to_handle(func)); |
| 563 | |
| 564 | return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0)); |
| 565 | } |
| 566 | |
| 567 | /** |
| 568 | * enable_slot - enable, configure a slot |
| 569 | * @slot: slot to be enabled |
| 570 | * |
| 571 | * This function should be called per *physical slot*, |
| 572 | * not per each slot object in ACPI namespace. |
| 573 | */ |
| 574 | static void __ref enable_slot(struct acpiphp_slot *slot) |
| 575 | { |
| 576 | struct pci_dev *dev; |
| 577 | struct pci_bus *bus = slot->bus; |
| 578 | struct acpiphp_func *func; |
| 579 | int max, pass; |
| 580 | LIST_HEAD(add_list); |
| 581 | |
| 582 | acpiphp_rescan_slot(slot); |
| 583 | max = acpiphp_max_busnr(bus); |
| 584 | for (pass = 0; pass < 2; pass++) { |
| 585 | list_for_each_entry(dev, &bus->devices, bus_list) { |
| 586 | if (PCI_SLOT(dev->devfn) != slot->device) |
| 587 | continue; |
| 588 | |
| 589 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || |
| 590 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { |
| 591 | max = pci_scan_bridge(bus, dev, max, pass); |
| 592 | if (pass && dev->subordinate) { |
| 593 | check_hotplug_bridge(slot, dev); |
| 594 | pcibios_resource_survey_bus(dev->subordinate); |
| 595 | __pci_bus_size_bridges(dev->subordinate, |
| 596 | &add_list); |
| 597 | } |
| 598 | } |
| 599 | } |
| 600 | } |
| 601 | __pci_bus_assign_resources(bus, &add_list, NULL); |
| 602 | |
| 603 | acpiphp_sanitize_bus(bus); |
| 604 | acpiphp_set_hpp_values(bus); |
| 605 | acpiphp_set_acpi_region(slot); |
| 606 | |
| 607 | list_for_each_entry(dev, &bus->devices, bus_list) { |
| 608 | /* Assume that newly added devices are powered on already. */ |
| 609 | if (!dev->is_added) |
| 610 | dev->current_state = PCI_D0; |
| 611 | } |
| 612 | |
| 613 | pci_bus_add_devices(bus); |
| 614 | |
| 615 | slot->flags |= SLOT_ENABLED; |
| 616 | list_for_each_entry(func, &slot->funcs, sibling) { |
| 617 | dev = pci_get_slot(bus, PCI_DEVFN(slot->device, |
| 618 | func->function)); |
| 619 | if (!dev) { |
| 620 | /* Do not set SLOT_ENABLED flag if some funcs |
| 621 | are not added. */ |
| 622 | slot->flags &= (~SLOT_ENABLED); |
| 623 | continue; |
| 624 | } |
| 625 | } |
| 626 | } |
| 627 | |
| 628 | /* return first device in slot, acquiring a reference on it */ |
| 629 | static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot) |
| 630 | { |
| 631 | struct pci_bus *bus = slot->bus; |
| 632 | struct pci_dev *dev; |
| 633 | struct pci_dev *ret = NULL; |
| 634 | |
| 635 | down_read(&pci_bus_sem); |
| 636 | list_for_each_entry(dev, &bus->devices, bus_list) |
| 637 | if (PCI_SLOT(dev->devfn) == slot->device) { |
| 638 | ret = pci_dev_get(dev); |
| 639 | break; |
| 640 | } |
| 641 | up_read(&pci_bus_sem); |
| 642 | |
| 643 | return ret; |
| 644 | } |
| 645 | |
| 646 | /** |
| 647 | * disable_slot - disable a slot |
| 648 | * @slot: ACPI PHP slot |
| 649 | */ |
| 650 | static void disable_slot(struct acpiphp_slot *slot) |
| 651 | { |
| 652 | struct acpiphp_func *func; |
| 653 | struct pci_dev *pdev; |
| 654 | |
| 655 | /* |
| 656 | * enable_slot() enumerates all functions in this device via |
| 657 | * pci_scan_slot(), whether they have associated ACPI hotplug |
| 658 | * methods (_EJ0, etc.) or not. Therefore, we remove all functions |
| 659 | * here. |
| 660 | */ |
| 661 | while ((pdev = dev_in_slot(slot))) { |
| 662 | pci_stop_and_remove_bus_device(pdev); |
| 663 | pci_dev_put(pdev); |
| 664 | } |
| 665 | |
| 666 | list_for_each_entry(func, &slot->funcs, sibling) |
| 667 | acpiphp_bus_trim(func_to_handle(func)); |
| 668 | |
| 669 | slot->flags &= (~SLOT_ENABLED); |
| 670 | } |
| 671 | |
| 672 | static bool acpiphp_no_hotplug(acpi_handle handle) |
| 673 | { |
| 674 | struct acpi_device *adev = NULL; |
| 675 | |
| 676 | acpi_bus_get_device(handle, &adev); |
| 677 | return adev && adev->flags.no_hotplug; |
| 678 | } |
| 679 | |
| 680 | static bool slot_no_hotplug(struct acpiphp_slot *slot) |
| 681 | { |
| 682 | struct acpiphp_func *func; |
| 683 | |
| 684 | list_for_each_entry(func, &slot->funcs, sibling) |
| 685 | if (acpiphp_no_hotplug(func_to_handle(func))) |
| 686 | return true; |
| 687 | |
| 688 | return false; |
| 689 | } |
| 690 | |
| 691 | /** |
| 692 | * get_slot_status - get ACPI slot status |
| 693 | * @slot: ACPI PHP slot |
| 694 | * |
| 695 | * If a slot has _STA for each function and if any one of them |
| 696 | * returned non-zero status, return it. |
| 697 | * |
| 698 | * If a slot doesn't have _STA and if any one of its functions' |
| 699 | * configuration space is configured, return 0x0f as a _STA. |
| 700 | * |
| 701 | * Otherwise return 0. |
| 702 | */ |
| 703 | static unsigned int get_slot_status(struct acpiphp_slot *slot) |
| 704 | { |
| 705 | unsigned long long sta = 0; |
| 706 | struct acpiphp_func *func; |
| 707 | |
| 708 | list_for_each_entry(func, &slot->funcs, sibling) { |
| 709 | if (func->flags & FUNC_HAS_STA) { |
| 710 | acpi_status status; |
| 711 | |
| 712 | status = acpi_evaluate_integer(func_to_handle(func), |
| 713 | "_STA", NULL, &sta); |
| 714 | if (ACPI_SUCCESS(status) && sta) |
| 715 | break; |
| 716 | } else { |
| 717 | u32 dvid; |
| 718 | |
| 719 | pci_bus_read_config_dword(slot->bus, |
| 720 | PCI_DEVFN(slot->device, |
| 721 | func->function), |
| 722 | PCI_VENDOR_ID, &dvid); |
| 723 | if (dvid != 0xffffffff) { |
| 724 | sta = ACPI_STA_ALL; |
| 725 | break; |
| 726 | } |
| 727 | } |
| 728 | } |
| 729 | |
| 730 | return (unsigned int)sta; |
| 731 | } |
| 732 | |
| 733 | /** |
| 734 | * trim_stale_devices - remove PCI devices that are not responding. |
| 735 | * @dev: PCI device to start walking the hierarchy from. |
| 736 | */ |
| 737 | static void trim_stale_devices(struct pci_dev *dev) |
| 738 | { |
| 739 | acpi_handle handle = ACPI_HANDLE(&dev->dev); |
| 740 | struct pci_bus *bus = dev->subordinate; |
| 741 | bool alive = false; |
| 742 | |
| 743 | if (handle) { |
| 744 | acpi_status status; |
| 745 | unsigned long long sta; |
| 746 | |
| 747 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
| 748 | alive = (ACPI_SUCCESS(status) && sta == ACPI_STA_ALL) |
| 749 | || acpiphp_no_hotplug(handle); |
| 750 | } |
| 751 | if (!alive) { |
| 752 | u32 v; |
| 753 | |
| 754 | /* Check if the device responds. */ |
| 755 | alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0); |
| 756 | } |
| 757 | if (!alive) { |
| 758 | pci_stop_and_remove_bus_device(dev); |
| 759 | if (handle) |
| 760 | acpiphp_bus_trim(handle); |
| 761 | } else if (bus) { |
| 762 | struct pci_dev *child, *tmp; |
| 763 | |
| 764 | /* The device is a bridge. so check the bus below it. */ |
| 765 | pm_runtime_get_sync(&dev->dev); |
| 766 | list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list) |
| 767 | trim_stale_devices(child); |
| 768 | |
| 769 | pm_runtime_put(&dev->dev); |
| 770 | } |
| 771 | } |
| 772 | |
| 773 | /** |
| 774 | * acpiphp_check_bridge - re-enumerate devices |
| 775 | * @bridge: where to begin re-enumeration |
| 776 | * |
| 777 | * Iterate over all slots under this bridge and make sure that if a |
| 778 | * card is present they are enabled, and if not they are disabled. |
| 779 | */ |
| 780 | static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) |
| 781 | { |
| 782 | struct acpiphp_slot *slot; |
| 783 | |
| 784 | /* Bail out if the bridge is going away. */ |
| 785 | if (bridge->is_going_away) |
| 786 | return; |
| 787 | |
| 788 | list_for_each_entry(slot, &bridge->slots, node) { |
| 789 | struct pci_bus *bus = slot->bus; |
| 790 | struct pci_dev *dev, *tmp; |
| 791 | |
| 792 | mutex_lock(&slot->crit_sect); |
| 793 | if (slot_no_hotplug(slot)) { |
| 794 | ; /* do nothing */ |
| 795 | } else if (get_slot_status(slot) == ACPI_STA_ALL) { |
| 796 | /* remove stale devices if any */ |
| 797 | list_for_each_entry_safe_reverse(dev, tmp, |
| 798 | &bus->devices, bus_list) |
| 799 | if (PCI_SLOT(dev->devfn) == slot->device) |
| 800 | trim_stale_devices(dev); |
| 801 | |
| 802 | /* configure all functions */ |
| 803 | enable_slot(slot); |
| 804 | } else { |
| 805 | disable_slot(slot); |
| 806 | } |
| 807 | mutex_unlock(&slot->crit_sect); |
| 808 | } |
| 809 | } |
| 810 | |
| 811 | static void acpiphp_set_hpp_values(struct pci_bus *bus) |
| 812 | { |
| 813 | struct pci_dev *dev; |
| 814 | |
| 815 | list_for_each_entry(dev, &bus->devices, bus_list) |
| 816 | pci_configure_slot(dev); |
| 817 | } |
| 818 | |
| 819 | /* |
| 820 | * Remove devices for which we could not assign resources, call |
| 821 | * arch specific code to fix-up the bus |
| 822 | */ |
| 823 | static void acpiphp_sanitize_bus(struct pci_bus *bus) |
| 824 | { |
| 825 | struct pci_dev *dev, *tmp; |
| 826 | int i; |
| 827 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; |
| 828 | |
| 829 | list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) { |
| 830 | for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { |
| 831 | struct resource *res = &dev->resource[i]; |
| 832 | if ((res->flags & type_mask) && !res->start && |
| 833 | res->end) { |
| 834 | /* Could not assign a required resources |
| 835 | * for this device, remove it */ |
| 836 | pci_stop_and_remove_bus_device(dev); |
| 837 | break; |
| 838 | } |
| 839 | } |
| 840 | } |
| 841 | } |
| 842 | |
| 843 | /* |
| 844 | * ACPI event handlers |
| 845 | */ |
| 846 | |
| 847 | void acpiphp_check_host_bridge(acpi_handle handle) |
| 848 | { |
| 849 | struct acpiphp_bridge *bridge; |
| 850 | |
| 851 | bridge = acpiphp_handle_to_bridge(handle); |
| 852 | if (bridge) { |
| 853 | pci_lock_rescan_remove(); |
| 854 | |
| 855 | acpiphp_check_bridge(bridge); |
| 856 | |
| 857 | pci_unlock_rescan_remove(); |
| 858 | put_bridge(bridge); |
| 859 | } |
| 860 | } |
| 861 | |
| 862 | static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot); |
| 863 | |
| 864 | static void hotplug_event(acpi_handle handle, u32 type, void *data) |
| 865 | { |
| 866 | struct acpiphp_context *context = data; |
| 867 | struct acpiphp_func *func = &context->func; |
| 868 | struct acpiphp_bridge *bridge; |
| 869 | char objname[64]; |
| 870 | struct acpi_buffer buffer = { .length = sizeof(objname), |
| 871 | .pointer = objname }; |
| 872 | |
| 873 | mutex_lock(&acpiphp_context_lock); |
| 874 | bridge = context->bridge; |
| 875 | if (bridge) |
| 876 | get_bridge(bridge); |
| 877 | |
| 878 | mutex_unlock(&acpiphp_context_lock); |
| 879 | |
| 880 | pci_lock_rescan_remove(); |
| 881 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
| 882 | |
| 883 | switch (type) { |
| 884 | case ACPI_NOTIFY_BUS_CHECK: |
| 885 | /* bus re-enumerate */ |
| 886 | pr_debug("%s: Bus check notify on %s\n", __func__, objname); |
| 887 | pr_debug("%s: re-enumerating slots under %s\n", |
| 888 | __func__, objname); |
| 889 | if (bridge) { |
| 890 | acpiphp_check_bridge(bridge); |
| 891 | } else { |
| 892 | struct acpiphp_slot *slot = func->slot; |
| 893 | |
| 894 | if (slot->flags & SLOT_IS_GOING_AWAY) |
| 895 | break; |
| 896 | |
| 897 | mutex_lock(&slot->crit_sect); |
| 898 | enable_slot(slot); |
| 899 | mutex_unlock(&slot->crit_sect); |
| 900 | } |
| 901 | break; |
| 902 | |
| 903 | case ACPI_NOTIFY_DEVICE_CHECK: |
| 904 | /* device check */ |
| 905 | pr_debug("%s: Device check notify on %s\n", __func__, objname); |
| 906 | if (bridge) { |
| 907 | acpiphp_check_bridge(bridge); |
| 908 | } else { |
| 909 | struct acpiphp_slot *slot = func->slot; |
| 910 | int ret; |
| 911 | |
| 912 | if (slot->flags & SLOT_IS_GOING_AWAY) |
| 913 | break; |
| 914 | |
| 915 | /* |
| 916 | * Check if anything has changed in the slot and rescan |
| 917 | * from the parent if that's the case. |
| 918 | */ |
| 919 | mutex_lock(&slot->crit_sect); |
| 920 | ret = acpiphp_rescan_slot(slot); |
| 921 | mutex_unlock(&slot->crit_sect); |
| 922 | if (ret) |
| 923 | acpiphp_check_bridge(func->parent); |
| 924 | } |
| 925 | break; |
| 926 | |
| 927 | case ACPI_NOTIFY_EJECT_REQUEST: |
| 928 | /* request device eject */ |
| 929 | pr_debug("%s: Device eject notify on %s\n", __func__, objname); |
| 930 | acpiphp_disable_and_eject_slot(func->slot); |
| 931 | break; |
| 932 | } |
| 933 | |
| 934 | pci_unlock_rescan_remove(); |
| 935 | if (bridge) |
| 936 | put_bridge(bridge); |
| 937 | } |
| 938 | |
| 939 | static void hotplug_event_work(void *data, u32 type) |
| 940 | { |
| 941 | struct acpiphp_context *context = data; |
| 942 | acpi_handle handle = context->handle; |
| 943 | |
| 944 | acpi_scan_lock_acquire(); |
| 945 | |
| 946 | hotplug_event(handle, type, context); |
| 947 | |
| 948 | acpi_scan_lock_release(); |
| 949 | acpi_evaluate_hotplug_ost(handle, type, ACPI_OST_SC_SUCCESS, NULL); |
| 950 | put_bridge(context->func.parent); |
| 951 | } |
| 952 | |
| 953 | /** |
| 954 | * handle_hotplug_event - handle ACPI hotplug event |
| 955 | * @handle: Notify()'ed acpi_handle |
| 956 | * @type: Notify code |
| 957 | * @data: pointer to acpiphp_context structure |
| 958 | * |
| 959 | * Handles ACPI event notification on slots. |
| 960 | */ |
| 961 | static void handle_hotplug_event(acpi_handle handle, u32 type, void *data) |
| 962 | { |
| 963 | struct acpiphp_context *context; |
| 964 | u32 ost_code = ACPI_OST_SC_SUCCESS; |
| 965 | acpi_status status; |
| 966 | |
| 967 | switch (type) { |
| 968 | case ACPI_NOTIFY_BUS_CHECK: |
| 969 | case ACPI_NOTIFY_DEVICE_CHECK: |
| 970 | break; |
| 971 | case ACPI_NOTIFY_EJECT_REQUEST: |
| 972 | ost_code = ACPI_OST_SC_EJECT_IN_PROGRESS; |
| 973 | acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); |
| 974 | break; |
| 975 | |
| 976 | case ACPI_NOTIFY_DEVICE_WAKE: |
| 977 | return; |
| 978 | |
| 979 | case ACPI_NOTIFY_FREQUENCY_MISMATCH: |
| 980 | acpi_handle_err(handle, "Device cannot be configured due " |
| 981 | "to a frequency mismatch\n"); |
| 982 | goto out; |
| 983 | |
| 984 | case ACPI_NOTIFY_BUS_MODE_MISMATCH: |
| 985 | acpi_handle_err(handle, "Device cannot be configured due " |
| 986 | "to a bus mode mismatch\n"); |
| 987 | goto out; |
| 988 | |
| 989 | case ACPI_NOTIFY_POWER_FAULT: |
| 990 | acpi_handle_err(handle, "Device has suffered a power fault\n"); |
| 991 | goto out; |
| 992 | |
| 993 | default: |
| 994 | acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type); |
| 995 | ost_code = ACPI_OST_SC_UNRECOGNIZED_NOTIFY; |
| 996 | goto out; |
| 997 | } |
| 998 | |
| 999 | mutex_lock(&acpiphp_context_lock); |
| 1000 | context = acpiphp_get_context(handle); |
| 1001 | if (!context || WARN_ON(context->handle != handle) |
| 1002 | || context->func.parent->is_going_away) |
| 1003 | goto err_out; |
| 1004 | |
| 1005 | get_bridge(context->func.parent); |
| 1006 | acpiphp_put_context(context); |
| 1007 | status = acpi_hotplug_execute(hotplug_event_work, context, type); |
| 1008 | if (ACPI_SUCCESS(status)) { |
| 1009 | mutex_unlock(&acpiphp_context_lock); |
| 1010 | return; |
| 1011 | } |
| 1012 | put_bridge(context->func.parent); |
| 1013 | |
| 1014 | err_out: |
| 1015 | mutex_unlock(&acpiphp_context_lock); |
| 1016 | ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
| 1017 | |
| 1018 | out: |
| 1019 | acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); |
| 1020 | } |
| 1021 | |
| 1022 | /* |
| 1023 | * Create hotplug slots for the PCI bus. |
| 1024 | * It should always return 0 to avoid skipping following notifiers. |
| 1025 | */ |
| 1026 | void acpiphp_enumerate_slots(struct pci_bus *bus) |
| 1027 | { |
| 1028 | struct acpiphp_bridge *bridge; |
| 1029 | acpi_handle handle; |
| 1030 | acpi_status status; |
| 1031 | |
| 1032 | if (acpiphp_disabled) |
| 1033 | return; |
| 1034 | |
| 1035 | handle = ACPI_HANDLE(bus->bridge); |
| 1036 | if (!handle) |
| 1037 | return; |
| 1038 | |
| 1039 | bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); |
| 1040 | if (!bridge) { |
| 1041 | acpi_handle_err(handle, "No memory for bridge object\n"); |
| 1042 | return; |
| 1043 | } |
| 1044 | |
| 1045 | INIT_LIST_HEAD(&bridge->slots); |
| 1046 | kref_init(&bridge->ref); |
| 1047 | bridge->pci_dev = pci_dev_get(bus->self); |
| 1048 | bridge->pci_bus = bus; |
| 1049 | |
| 1050 | /* |
| 1051 | * Grab a ref to the subordinate PCI bus in case the bus is |
| 1052 | * removed via PCI core logical hotplug. The ref pins the bus |
| 1053 | * (which we access during module unload). |
| 1054 | */ |
| 1055 | get_device(&bus->dev); |
| 1056 | |
| 1057 | if (!pci_is_root_bus(bridge->pci_bus)) { |
| 1058 | struct acpiphp_context *context; |
| 1059 | |
| 1060 | /* |
| 1061 | * This bridge should have been registered as a hotplug function |
| 1062 | * under its parent, so the context should be there, unless the |
| 1063 | * parent is going to be handled by pciehp, in which case this |
| 1064 | * bridge is not interesting to us either. |
| 1065 | */ |
| 1066 | mutex_lock(&acpiphp_context_lock); |
| 1067 | context = acpiphp_get_context(handle); |
| 1068 | if (!context) { |
| 1069 | mutex_unlock(&acpiphp_context_lock); |
| 1070 | put_device(&bus->dev); |
| 1071 | pci_dev_put(bridge->pci_dev); |
| 1072 | kfree(bridge); |
| 1073 | return; |
| 1074 | } |
| 1075 | bridge->context = context; |
| 1076 | context->bridge = bridge; |
| 1077 | /* Get a reference to the parent bridge. */ |
| 1078 | get_bridge(context->func.parent); |
| 1079 | mutex_unlock(&acpiphp_context_lock); |
| 1080 | } |
| 1081 | |
| 1082 | /* must be added to the list prior to calling register_slot */ |
| 1083 | mutex_lock(&bridge_mutex); |
| 1084 | list_add(&bridge->list, &bridge_list); |
| 1085 | mutex_unlock(&bridge_mutex); |
| 1086 | |
| 1087 | /* register all slot objects under this bridge */ |
| 1088 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, |
| 1089 | register_slot, NULL, bridge, NULL); |
| 1090 | if (ACPI_FAILURE(status)) { |
| 1091 | acpi_handle_err(handle, "failed to register slots\n"); |
| 1092 | cleanup_bridge(bridge); |
| 1093 | put_bridge(bridge); |
| 1094 | } |
| 1095 | } |
| 1096 | |
| 1097 | /* Destroy hotplug slots associated with the PCI bus */ |
| 1098 | void acpiphp_remove_slots(struct pci_bus *bus) |
| 1099 | { |
| 1100 | struct acpiphp_bridge *bridge; |
| 1101 | |
| 1102 | if (acpiphp_disabled) |
| 1103 | return; |
| 1104 | |
| 1105 | mutex_lock(&bridge_mutex); |
| 1106 | list_for_each_entry(bridge, &bridge_list, list) |
| 1107 | if (bridge->pci_bus == bus) { |
| 1108 | mutex_unlock(&bridge_mutex); |
| 1109 | cleanup_bridge(bridge); |
| 1110 | put_bridge(bridge); |
| 1111 | return; |
| 1112 | } |
| 1113 | |
| 1114 | mutex_unlock(&bridge_mutex); |
| 1115 | } |
| 1116 | |
| 1117 | /** |
| 1118 | * acpiphp_enable_slot - power on slot |
| 1119 | * @slot: ACPI PHP slot |
| 1120 | */ |
| 1121 | int acpiphp_enable_slot(struct acpiphp_slot *slot) |
| 1122 | { |
| 1123 | pci_lock_rescan_remove(); |
| 1124 | |
| 1125 | if (slot->flags & SLOT_IS_GOING_AWAY) |
| 1126 | return -ENODEV; |
| 1127 | |
| 1128 | mutex_lock(&slot->crit_sect); |
| 1129 | /* configure all functions */ |
| 1130 | if (!(slot->flags & SLOT_ENABLED)) |
| 1131 | enable_slot(slot); |
| 1132 | |
| 1133 | mutex_unlock(&slot->crit_sect); |
| 1134 | |
| 1135 | pci_unlock_rescan_remove(); |
| 1136 | return 0; |
| 1137 | } |
| 1138 | |
| 1139 | /** |
| 1140 | * acpiphp_disable_and_eject_slot - power off and eject slot |
| 1141 | * @slot: ACPI PHP slot |
| 1142 | */ |
| 1143 | static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) |
| 1144 | { |
| 1145 | struct acpiphp_func *func; |
| 1146 | |
| 1147 | if (slot->flags & SLOT_IS_GOING_AWAY) |
| 1148 | return -ENODEV; |
| 1149 | |
| 1150 | mutex_lock(&slot->crit_sect); |
| 1151 | |
| 1152 | /* unconfigure all functions */ |
| 1153 | disable_slot(slot); |
| 1154 | |
| 1155 | list_for_each_entry(func, &slot->funcs, sibling) |
| 1156 | if (func->flags & FUNC_HAS_EJ0) { |
| 1157 | acpi_handle handle = func_to_handle(func); |
| 1158 | |
| 1159 | if (ACPI_FAILURE(acpi_evaluate_ej0(handle))) |
| 1160 | acpi_handle_err(handle, "_EJ0 failed\n"); |
| 1161 | |
| 1162 | break; |
| 1163 | } |
| 1164 | |
| 1165 | mutex_unlock(&slot->crit_sect); |
| 1166 | return 0; |
| 1167 | } |
| 1168 | |
| 1169 | int acpiphp_disable_slot(struct acpiphp_slot *slot) |
| 1170 | { |
| 1171 | int ret; |
| 1172 | |
| 1173 | pci_lock_rescan_remove(); |
| 1174 | ret = acpiphp_disable_and_eject_slot(slot); |
| 1175 | pci_unlock_rescan_remove(); |
| 1176 | return ret; |
| 1177 | } |
| 1178 | |
| 1179 | /* |
| 1180 | * slot enabled: 1 |
| 1181 | * slot disabled: 0 |
| 1182 | */ |
| 1183 | u8 acpiphp_get_power_status(struct acpiphp_slot *slot) |
| 1184 | { |
| 1185 | return (slot->flags & SLOT_ENABLED); |
| 1186 | } |
| 1187 | |
| 1188 | /* |
| 1189 | * latch open: 1 |
| 1190 | * latch closed: 0 |
| 1191 | */ |
| 1192 | u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) |
| 1193 | { |
| 1194 | return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); |
| 1195 | } |
| 1196 | |
| 1197 | /* |
| 1198 | * adapter presence : 1 |
| 1199 | * absence : 0 |
| 1200 | */ |
| 1201 | u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) |
| 1202 | { |
| 1203 | return !!get_slot_status(slot); |
| 1204 | } |