| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * scan.c - support for transforming the ACPI namespace into individual objects |
| 4 | */ |
| 5 | |
| 6 | #define pr_fmt(fmt) "ACPI: " fmt |
| 7 | |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/slab.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/acpi.h> |
| 13 | #include <linux/acpi_iort.h> |
| 14 | #include <linux/acpi_viot.h> |
| 15 | #include <linux/iommu.h> |
| 16 | #include <linux/signal.h> |
| 17 | #include <linux/kthread.h> |
| 18 | #include <linux/dmi.h> |
| 19 | #include <linux/dma-map-ops.h> |
| 20 | #include <linux/platform_data/x86/apple.h> |
| 21 | #include <linux/pgtable.h> |
| 22 | #include <linux/crc32.h> |
| 23 | #include <linux/dma-direct.h> |
| 24 | |
| 25 | #include "internal.h" |
| 26 | |
| 27 | extern struct acpi_device *acpi_root; |
| 28 | |
| 29 | #define ACPI_BUS_CLASS "system_bus" |
| 30 | #define ACPI_BUS_HID "LNXSYBUS" |
| 31 | #define ACPI_BUS_DEVICE_NAME "System Bus" |
| 32 | |
| 33 | #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page) |
| 34 | |
| 35 | static const char *dummy_hid = "device"; |
| 36 | |
| 37 | static LIST_HEAD(acpi_dep_list); |
| 38 | static DEFINE_MUTEX(acpi_dep_list_lock); |
| 39 | LIST_HEAD(acpi_bus_id_list); |
| 40 | static DEFINE_MUTEX(acpi_scan_lock); |
| 41 | static LIST_HEAD(acpi_scan_handlers_list); |
| 42 | DEFINE_MUTEX(acpi_device_lock); |
| 43 | LIST_HEAD(acpi_wakeup_device_list); |
| 44 | static DEFINE_MUTEX(acpi_hp_context_lock); |
| 45 | |
| 46 | /* |
| 47 | * The UART device described by the SPCR table is the only object which needs |
| 48 | * special-casing. Everything else is covered by ACPI namespace paths in STAO |
| 49 | * table. |
| 50 | */ |
| 51 | static u64 spcr_uart_addr; |
| 52 | |
| 53 | void acpi_scan_lock_acquire(void) |
| 54 | { |
| 55 | mutex_lock(&acpi_scan_lock); |
| 56 | } |
| 57 | EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); |
| 58 | |
| 59 | void acpi_scan_lock_release(void) |
| 60 | { |
| 61 | mutex_unlock(&acpi_scan_lock); |
| 62 | } |
| 63 | EXPORT_SYMBOL_GPL(acpi_scan_lock_release); |
| 64 | |
| 65 | void acpi_lock_hp_context(void) |
| 66 | { |
| 67 | mutex_lock(&acpi_hp_context_lock); |
| 68 | } |
| 69 | |
| 70 | void acpi_unlock_hp_context(void) |
| 71 | { |
| 72 | mutex_unlock(&acpi_hp_context_lock); |
| 73 | } |
| 74 | |
| 75 | void acpi_initialize_hp_context(struct acpi_device *adev, |
| 76 | struct acpi_hotplug_context *hp, |
| 77 | int (*notify)(struct acpi_device *, u32), |
| 78 | void (*uevent)(struct acpi_device *, u32)) |
| 79 | { |
| 80 | acpi_lock_hp_context(); |
| 81 | hp->notify = notify; |
| 82 | hp->uevent = uevent; |
| 83 | acpi_set_hp_context(adev, hp); |
| 84 | acpi_unlock_hp_context(); |
| 85 | } |
| 86 | EXPORT_SYMBOL_GPL(acpi_initialize_hp_context); |
| 87 | |
| 88 | int acpi_scan_add_handler(struct acpi_scan_handler *handler) |
| 89 | { |
| 90 | if (!handler) |
| 91 | return -EINVAL; |
| 92 | |
| 93 | list_add_tail(&handler->list_node, &acpi_scan_handlers_list); |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, |
| 98 | const char *hotplug_profile_name) |
| 99 | { |
| 100 | int error; |
| 101 | |
| 102 | error = acpi_scan_add_handler(handler); |
| 103 | if (error) |
| 104 | return error; |
| 105 | |
| 106 | acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) |
| 111 | { |
| 112 | struct acpi_device_physical_node *pn; |
| 113 | bool offline = true; |
| 114 | char *envp[] = { "EVENT=offline", NULL }; |
| 115 | |
| 116 | /* |
| 117 | * acpi_container_offline() calls this for all of the container's |
| 118 | * children under the container's physical_node_lock lock. |
| 119 | */ |
| 120 | mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING); |
| 121 | |
| 122 | list_for_each_entry(pn, &adev->physical_node_list, node) |
| 123 | if (device_supports_offline(pn->dev) && !pn->dev->offline) { |
| 124 | if (uevent) |
| 125 | kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp); |
| 126 | |
| 127 | offline = false; |
| 128 | break; |
| 129 | } |
| 130 | |
| 131 | mutex_unlock(&adev->physical_node_lock); |
| 132 | return offline; |
| 133 | } |
| 134 | |
| 135 | static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, |
| 136 | void **ret_p) |
| 137 | { |
| 138 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
| 139 | struct acpi_device_physical_node *pn; |
| 140 | bool second_pass = (bool)data; |
| 141 | acpi_status status = AE_OK; |
| 142 | |
| 143 | if (!device) |
| 144 | return AE_OK; |
| 145 | |
| 146 | if (device->handler && !device->handler->hotplug.enabled) { |
| 147 | *ret_p = &device->dev; |
| 148 | return AE_SUPPORT; |
| 149 | } |
| 150 | |
| 151 | mutex_lock(&device->physical_node_lock); |
| 152 | |
| 153 | list_for_each_entry(pn, &device->physical_node_list, node) { |
| 154 | int ret; |
| 155 | |
| 156 | if (second_pass) { |
| 157 | /* Skip devices offlined by the first pass. */ |
| 158 | if (pn->put_online) |
| 159 | continue; |
| 160 | } else { |
| 161 | pn->put_online = false; |
| 162 | } |
| 163 | ret = device_offline(pn->dev); |
| 164 | if (ret >= 0) { |
| 165 | pn->put_online = !ret; |
| 166 | } else { |
| 167 | *ret_p = pn->dev; |
| 168 | if (second_pass) { |
| 169 | status = AE_ERROR; |
| 170 | break; |
| 171 | } |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | mutex_unlock(&device->physical_node_lock); |
| 176 | |
| 177 | return status; |
| 178 | } |
| 179 | |
| 180 | static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, |
| 181 | void **ret_p) |
| 182 | { |
| 183 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
| 184 | struct acpi_device_physical_node *pn; |
| 185 | |
| 186 | if (!device) |
| 187 | return AE_OK; |
| 188 | |
| 189 | mutex_lock(&device->physical_node_lock); |
| 190 | |
| 191 | list_for_each_entry(pn, &device->physical_node_list, node) |
| 192 | if (pn->put_online) { |
| 193 | device_online(pn->dev); |
| 194 | pn->put_online = false; |
| 195 | } |
| 196 | |
| 197 | mutex_unlock(&device->physical_node_lock); |
| 198 | |
| 199 | return AE_OK; |
| 200 | } |
| 201 | |
| 202 | static int acpi_scan_try_to_offline(struct acpi_device *device) |
| 203 | { |
| 204 | acpi_handle handle = device->handle; |
| 205 | struct device *errdev = NULL; |
| 206 | acpi_status status; |
| 207 | |
| 208 | /* |
| 209 | * Carry out two passes here and ignore errors in the first pass, |
| 210 | * because if the devices in question are memory blocks and |
| 211 | * CONFIG_MEMCG is set, one of the blocks may hold data structures |
| 212 | * that the other blocks depend on, but it is not known in advance which |
| 213 | * block holds them. |
| 214 | * |
| 215 | * If the first pass is successful, the second one isn't needed, though. |
| 216 | */ |
| 217 | status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
| 218 | NULL, acpi_bus_offline, (void *)false, |
| 219 | (void **)&errdev); |
| 220 | if (status == AE_SUPPORT) { |
| 221 | dev_warn(errdev, "Offline disabled.\n"); |
| 222 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
| 223 | acpi_bus_online, NULL, NULL, NULL); |
| 224 | return -EPERM; |
| 225 | } |
| 226 | acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); |
| 227 | if (errdev) { |
| 228 | errdev = NULL; |
| 229 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
| 230 | NULL, acpi_bus_offline, (void *)true, |
| 231 | (void **)&errdev); |
| 232 | if (!errdev) |
| 233 | acpi_bus_offline(handle, 0, (void *)true, |
| 234 | (void **)&errdev); |
| 235 | |
| 236 | if (errdev) { |
| 237 | dev_warn(errdev, "Offline failed.\n"); |
| 238 | acpi_bus_online(handle, 0, NULL, NULL); |
| 239 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, |
| 240 | ACPI_UINT32_MAX, acpi_bus_online, |
| 241 | NULL, NULL, NULL); |
| 242 | return -EBUSY; |
| 243 | } |
| 244 | } |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | static int acpi_scan_hot_remove(struct acpi_device *device) |
| 249 | { |
| 250 | acpi_handle handle = device->handle; |
| 251 | unsigned long long sta; |
| 252 | acpi_status status; |
| 253 | |
| 254 | if (device->handler && device->handler->hotplug.demand_offline) { |
| 255 | if (!acpi_scan_is_offline(device, true)) |
| 256 | return -EBUSY; |
| 257 | } else { |
| 258 | int error = acpi_scan_try_to_offline(device); |
| 259 | if (error) |
| 260 | return error; |
| 261 | } |
| 262 | |
| 263 | acpi_handle_debug(handle, "Ejecting\n"); |
| 264 | |
| 265 | acpi_bus_trim(device); |
| 266 | |
| 267 | acpi_evaluate_lck(handle, 0); |
| 268 | /* |
| 269 | * TBD: _EJD support. |
| 270 | */ |
| 271 | status = acpi_evaluate_ej0(handle); |
| 272 | if (status == AE_NOT_FOUND) |
| 273 | return -ENODEV; |
| 274 | else if (ACPI_FAILURE(status)) |
| 275 | return -EIO; |
| 276 | |
| 277 | /* |
| 278 | * Verify if eject was indeed successful. If not, log an error |
| 279 | * message. No need to call _OST since _EJ0 call was made OK. |
| 280 | */ |
| 281 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
| 282 | if (ACPI_FAILURE(status)) { |
| 283 | acpi_handle_warn(handle, |
| 284 | "Status check after eject failed (0x%x)\n", status); |
| 285 | } else if (sta & ACPI_STA_DEVICE_ENABLED) { |
| 286 | acpi_handle_warn(handle, |
| 287 | "Eject incomplete - status 0x%llx\n", sta); |
| 288 | } |
| 289 | |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | static int acpi_scan_device_not_present(struct acpi_device *adev) |
| 294 | { |
| 295 | if (!acpi_device_enumerated(adev)) { |
| 296 | dev_warn(&adev->dev, "Still not present\n"); |
| 297 | return -EALREADY; |
| 298 | } |
| 299 | acpi_bus_trim(adev); |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | static int acpi_scan_device_check(struct acpi_device *adev) |
| 304 | { |
| 305 | int error; |
| 306 | |
| 307 | acpi_bus_get_status(adev); |
| 308 | if (adev->status.present || adev->status.functional) { |
| 309 | /* |
| 310 | * This function is only called for device objects for which |
| 311 | * matching scan handlers exist. The only situation in which |
| 312 | * the scan handler is not attached to this device object yet |
| 313 | * is when the device has just appeared (either it wasn't |
| 314 | * present at all before or it was removed and then added |
| 315 | * again). |
| 316 | */ |
| 317 | if (adev->handler) { |
| 318 | dev_warn(&adev->dev, "Already enumerated\n"); |
| 319 | return -EALREADY; |
| 320 | } |
| 321 | error = acpi_bus_scan(adev->handle); |
| 322 | if (error) { |
| 323 | dev_warn(&adev->dev, "Namespace scan failure\n"); |
| 324 | return error; |
| 325 | } |
| 326 | if (!adev->handler) { |
| 327 | dev_warn(&adev->dev, "Enumeration failure\n"); |
| 328 | error = -ENODEV; |
| 329 | } |
| 330 | } else { |
| 331 | error = acpi_scan_device_not_present(adev); |
| 332 | } |
| 333 | return error; |
| 334 | } |
| 335 | |
| 336 | static int acpi_scan_bus_check(struct acpi_device *adev, void *not_used) |
| 337 | { |
| 338 | struct acpi_scan_handler *handler = adev->handler; |
| 339 | int error; |
| 340 | |
| 341 | acpi_bus_get_status(adev); |
| 342 | if (!(adev->status.present || adev->status.functional)) { |
| 343 | acpi_scan_device_not_present(adev); |
| 344 | return 0; |
| 345 | } |
| 346 | if (handler && handler->hotplug.scan_dependent) |
| 347 | return handler->hotplug.scan_dependent(adev); |
| 348 | |
| 349 | error = acpi_bus_scan(adev->handle); |
| 350 | if (error) { |
| 351 | dev_warn(&adev->dev, "Namespace scan failure\n"); |
| 352 | return error; |
| 353 | } |
| 354 | return acpi_dev_for_each_child(adev, acpi_scan_bus_check, NULL); |
| 355 | } |
| 356 | |
| 357 | static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type) |
| 358 | { |
| 359 | switch (type) { |
| 360 | case ACPI_NOTIFY_BUS_CHECK: |
| 361 | return acpi_scan_bus_check(adev, NULL); |
| 362 | case ACPI_NOTIFY_DEVICE_CHECK: |
| 363 | return acpi_scan_device_check(adev); |
| 364 | case ACPI_NOTIFY_EJECT_REQUEST: |
| 365 | case ACPI_OST_EC_OSPM_EJECT: |
| 366 | if (adev->handler && !adev->handler->hotplug.enabled) { |
| 367 | dev_info(&adev->dev, "Eject disabled\n"); |
| 368 | return -EPERM; |
| 369 | } |
| 370 | acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST, |
| 371 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); |
| 372 | return acpi_scan_hot_remove(adev); |
| 373 | } |
| 374 | return -EINVAL; |
| 375 | } |
| 376 | |
| 377 | void acpi_device_hotplug(struct acpi_device *adev, u32 src) |
| 378 | { |
| 379 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
| 380 | int error = -ENODEV; |
| 381 | |
| 382 | lock_device_hotplug(); |
| 383 | mutex_lock(&acpi_scan_lock); |
| 384 | |
| 385 | /* |
| 386 | * The device object's ACPI handle cannot become invalid as long as we |
| 387 | * are holding acpi_scan_lock, but it might have become invalid before |
| 388 | * that lock was acquired. |
| 389 | */ |
| 390 | if (adev->handle == INVALID_ACPI_HANDLE) |
| 391 | goto err_out; |
| 392 | |
| 393 | if (adev->flags.is_dock_station) { |
| 394 | error = dock_notify(adev, src); |
| 395 | } else if (adev->flags.hotplug_notify) { |
| 396 | error = acpi_generic_hotplug_event(adev, src); |
| 397 | } else { |
| 398 | int (*notify)(struct acpi_device *, u32); |
| 399 | |
| 400 | acpi_lock_hp_context(); |
| 401 | notify = adev->hp ? adev->hp->notify : NULL; |
| 402 | acpi_unlock_hp_context(); |
| 403 | /* |
| 404 | * There may be additional notify handlers for device objects |
| 405 | * without the .event() callback, so ignore them here. |
| 406 | */ |
| 407 | if (notify) |
| 408 | error = notify(adev, src); |
| 409 | else |
| 410 | goto out; |
| 411 | } |
| 412 | switch (error) { |
| 413 | case 0: |
| 414 | ost_code = ACPI_OST_SC_SUCCESS; |
| 415 | break; |
| 416 | case -EPERM: |
| 417 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; |
| 418 | break; |
| 419 | case -EBUSY: |
| 420 | ost_code = ACPI_OST_SC_DEVICE_BUSY; |
| 421 | break; |
| 422 | default: |
| 423 | ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
| 424 | break; |
| 425 | } |
| 426 | |
| 427 | err_out: |
| 428 | acpi_evaluate_ost(adev->handle, src, ost_code, NULL); |
| 429 | |
| 430 | out: |
| 431 | acpi_put_acpi_dev(adev); |
| 432 | mutex_unlock(&acpi_scan_lock); |
| 433 | unlock_device_hotplug(); |
| 434 | } |
| 435 | |
| 436 | static void acpi_free_power_resources_lists(struct acpi_device *device) |
| 437 | { |
| 438 | int i; |
| 439 | |
| 440 | if (device->wakeup.flags.valid) |
| 441 | acpi_power_resources_list_free(&device->wakeup.resources); |
| 442 | |
| 443 | if (!device->power.flags.power_resources) |
| 444 | return; |
| 445 | |
| 446 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
| 447 | struct acpi_device_power_state *ps = &device->power.states[i]; |
| 448 | acpi_power_resources_list_free(&ps->resources); |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | static void acpi_device_release(struct device *dev) |
| 453 | { |
| 454 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
| 455 | |
| 456 | acpi_free_properties(acpi_dev); |
| 457 | acpi_free_pnp_ids(&acpi_dev->pnp); |
| 458 | acpi_free_power_resources_lists(acpi_dev); |
| 459 | kfree(acpi_dev); |
| 460 | } |
| 461 | |
| 462 | static void acpi_device_del(struct acpi_device *device) |
| 463 | { |
| 464 | struct acpi_device_bus_id *acpi_device_bus_id; |
| 465 | |
| 466 | mutex_lock(&acpi_device_lock); |
| 467 | |
| 468 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) |
| 469 | if (!strcmp(acpi_device_bus_id->bus_id, |
| 470 | acpi_device_hid(device))) { |
| 471 | ida_free(&acpi_device_bus_id->instance_ida, |
| 472 | device->pnp.instance_no); |
| 473 | if (ida_is_empty(&acpi_device_bus_id->instance_ida)) { |
| 474 | list_del(&acpi_device_bus_id->node); |
| 475 | kfree_const(acpi_device_bus_id->bus_id); |
| 476 | kfree(acpi_device_bus_id); |
| 477 | } |
| 478 | break; |
| 479 | } |
| 480 | |
| 481 | list_del(&device->wakeup_list); |
| 482 | |
| 483 | mutex_unlock(&acpi_device_lock); |
| 484 | |
| 485 | acpi_power_add_remove_device(device, false); |
| 486 | acpi_device_remove_files(device); |
| 487 | if (device->remove) |
| 488 | device->remove(device); |
| 489 | |
| 490 | device_del(&device->dev); |
| 491 | } |
| 492 | |
| 493 | static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain); |
| 494 | |
| 495 | static LIST_HEAD(acpi_device_del_list); |
| 496 | static DEFINE_MUTEX(acpi_device_del_lock); |
| 497 | |
| 498 | static void acpi_device_del_work_fn(struct work_struct *work_not_used) |
| 499 | { |
| 500 | for (;;) { |
| 501 | struct acpi_device *adev; |
| 502 | |
| 503 | mutex_lock(&acpi_device_del_lock); |
| 504 | |
| 505 | if (list_empty(&acpi_device_del_list)) { |
| 506 | mutex_unlock(&acpi_device_del_lock); |
| 507 | break; |
| 508 | } |
| 509 | adev = list_first_entry(&acpi_device_del_list, |
| 510 | struct acpi_device, del_list); |
| 511 | list_del(&adev->del_list); |
| 512 | |
| 513 | mutex_unlock(&acpi_device_del_lock); |
| 514 | |
| 515 | blocking_notifier_call_chain(&acpi_reconfig_chain, |
| 516 | ACPI_RECONFIG_DEVICE_REMOVE, adev); |
| 517 | |
| 518 | acpi_device_del(adev); |
| 519 | /* |
| 520 | * Drop references to all power resources that might have been |
| 521 | * used by the device. |
| 522 | */ |
| 523 | acpi_power_transition(adev, ACPI_STATE_D3_COLD); |
| 524 | acpi_dev_put(adev); |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | /** |
| 529 | * acpi_scan_drop_device - Drop an ACPI device object. |
| 530 | * @handle: Handle of an ACPI namespace node, not used. |
| 531 | * @context: Address of the ACPI device object to drop. |
| 532 | * |
| 533 | * This is invoked by acpi_ns_delete_node() during the removal of the ACPI |
| 534 | * namespace node the device object pointed to by @context is attached to. |
| 535 | * |
| 536 | * The unregistration is carried out asynchronously to avoid running |
| 537 | * acpi_device_del() under the ACPICA's namespace mutex and the list is used to |
| 538 | * ensure the correct ordering (the device objects must be unregistered in the |
| 539 | * same order in which the corresponding namespace nodes are deleted). |
| 540 | */ |
| 541 | static void acpi_scan_drop_device(acpi_handle handle, void *context) |
| 542 | { |
| 543 | static DECLARE_WORK(work, acpi_device_del_work_fn); |
| 544 | struct acpi_device *adev = context; |
| 545 | |
| 546 | mutex_lock(&acpi_device_del_lock); |
| 547 | |
| 548 | /* |
| 549 | * Use the ACPI hotplug workqueue which is ordered, so this work item |
| 550 | * won't run after any hotplug work items submitted subsequently. That |
| 551 | * prevents attempts to register device objects identical to those being |
| 552 | * deleted from happening concurrently (such attempts result from |
| 553 | * hotplug events handled via the ACPI hotplug workqueue). It also will |
| 554 | * run after all of the work items submitted previously, which helps |
| 555 | * those work items to ensure that they are not accessing stale device |
| 556 | * objects. |
| 557 | */ |
| 558 | if (list_empty(&acpi_device_del_list)) |
| 559 | acpi_queue_hotplug_work(&work); |
| 560 | |
| 561 | list_add_tail(&adev->del_list, &acpi_device_del_list); |
| 562 | /* Make acpi_ns_validate_handle() return NULL for this handle. */ |
| 563 | adev->handle = INVALID_ACPI_HANDLE; |
| 564 | |
| 565 | mutex_unlock(&acpi_device_del_lock); |
| 566 | } |
| 567 | |
| 568 | static struct acpi_device *handle_to_device(acpi_handle handle, |
| 569 | void (*callback)(void *)) |
| 570 | { |
| 571 | struct acpi_device *adev = NULL; |
| 572 | acpi_status status; |
| 573 | |
| 574 | status = acpi_get_data_full(handle, acpi_scan_drop_device, |
| 575 | (void **)&adev, callback); |
| 576 | if (ACPI_FAILURE(status) || !adev) { |
| 577 | acpi_handle_debug(handle, "No context!\n"); |
| 578 | return NULL; |
| 579 | } |
| 580 | return adev; |
| 581 | } |
| 582 | |
| 583 | /** |
| 584 | * acpi_fetch_acpi_dev - Retrieve ACPI device object. |
| 585 | * @handle: ACPI handle associated with the requested ACPI device object. |
| 586 | * |
| 587 | * Return a pointer to the ACPI device object associated with @handle, if |
| 588 | * present, or NULL otherwise. |
| 589 | */ |
| 590 | struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle) |
| 591 | { |
| 592 | return handle_to_device(handle, NULL); |
| 593 | } |
| 594 | EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev); |
| 595 | |
| 596 | static void get_acpi_device(void *dev) |
| 597 | { |
| 598 | acpi_dev_get(dev); |
| 599 | } |
| 600 | |
| 601 | /** |
| 602 | * acpi_get_acpi_dev - Retrieve ACPI device object and reference count it. |
| 603 | * @handle: ACPI handle associated with the requested ACPI device object. |
| 604 | * |
| 605 | * Return a pointer to the ACPI device object associated with @handle and bump |
| 606 | * up that object's reference counter (under the ACPI Namespace lock), if |
| 607 | * present, or return NULL otherwise. |
| 608 | * |
| 609 | * The ACPI device object reference acquired by this function needs to be |
| 610 | * dropped via acpi_dev_put(). |
| 611 | */ |
| 612 | struct acpi_device *acpi_get_acpi_dev(acpi_handle handle) |
| 613 | { |
| 614 | return handle_to_device(handle, get_acpi_device); |
| 615 | } |
| 616 | EXPORT_SYMBOL_GPL(acpi_get_acpi_dev); |
| 617 | |
| 618 | static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id) |
| 619 | { |
| 620 | struct acpi_device_bus_id *acpi_device_bus_id; |
| 621 | |
| 622 | /* Find suitable bus_id and instance number in acpi_bus_id_list. */ |
| 623 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { |
| 624 | if (!strcmp(acpi_device_bus_id->bus_id, dev_id)) |
| 625 | return acpi_device_bus_id; |
| 626 | } |
| 627 | return NULL; |
| 628 | } |
| 629 | |
| 630 | static int acpi_device_set_name(struct acpi_device *device, |
| 631 | struct acpi_device_bus_id *acpi_device_bus_id) |
| 632 | { |
| 633 | struct ida *instance_ida = &acpi_device_bus_id->instance_ida; |
| 634 | int result; |
| 635 | |
| 636 | result = ida_alloc(instance_ida, GFP_KERNEL); |
| 637 | if (result < 0) |
| 638 | return result; |
| 639 | |
| 640 | device->pnp.instance_no = result; |
| 641 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result); |
| 642 | return 0; |
| 643 | } |
| 644 | |
| 645 | int acpi_tie_acpi_dev(struct acpi_device *adev) |
| 646 | { |
| 647 | acpi_handle handle = adev->handle; |
| 648 | acpi_status status; |
| 649 | |
| 650 | if (!handle) |
| 651 | return 0; |
| 652 | |
| 653 | status = acpi_attach_data(handle, acpi_scan_drop_device, adev); |
| 654 | if (ACPI_FAILURE(status)) { |
| 655 | acpi_handle_err(handle, "Unable to attach device data\n"); |
| 656 | return -ENODEV; |
| 657 | } |
| 658 | |
| 659 | return 0; |
| 660 | } |
| 661 | |
| 662 | static void acpi_store_pld_crc(struct acpi_device *adev) |
| 663 | { |
| 664 | struct acpi_pld_info *pld; |
| 665 | acpi_status status; |
| 666 | |
| 667 | status = acpi_get_physical_device_location(adev->handle, &pld); |
| 668 | if (ACPI_FAILURE(status)) |
| 669 | return; |
| 670 | |
| 671 | adev->pld_crc = crc32(~0, pld, sizeof(*pld)); |
| 672 | ACPI_FREE(pld); |
| 673 | } |
| 674 | |
| 675 | int acpi_device_add(struct acpi_device *device) |
| 676 | { |
| 677 | struct acpi_device_bus_id *acpi_device_bus_id; |
| 678 | int result; |
| 679 | |
| 680 | /* |
| 681 | * Linkage |
| 682 | * ------- |
| 683 | * Link this device to its parent and siblings. |
| 684 | */ |
| 685 | INIT_LIST_HEAD(&device->wakeup_list); |
| 686 | INIT_LIST_HEAD(&device->physical_node_list); |
| 687 | INIT_LIST_HEAD(&device->del_list); |
| 688 | mutex_init(&device->physical_node_lock); |
| 689 | |
| 690 | mutex_lock(&acpi_device_lock); |
| 691 | |
| 692 | acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device)); |
| 693 | if (acpi_device_bus_id) { |
| 694 | result = acpi_device_set_name(device, acpi_device_bus_id); |
| 695 | if (result) |
| 696 | goto err_unlock; |
| 697 | } else { |
| 698 | acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id), |
| 699 | GFP_KERNEL); |
| 700 | if (!acpi_device_bus_id) { |
| 701 | result = -ENOMEM; |
| 702 | goto err_unlock; |
| 703 | } |
| 704 | acpi_device_bus_id->bus_id = |
| 705 | kstrdup_const(acpi_device_hid(device), GFP_KERNEL); |
| 706 | if (!acpi_device_bus_id->bus_id) { |
| 707 | kfree(acpi_device_bus_id); |
| 708 | result = -ENOMEM; |
| 709 | goto err_unlock; |
| 710 | } |
| 711 | |
| 712 | ida_init(&acpi_device_bus_id->instance_ida); |
| 713 | |
| 714 | result = acpi_device_set_name(device, acpi_device_bus_id); |
| 715 | if (result) { |
| 716 | kfree_const(acpi_device_bus_id->bus_id); |
| 717 | kfree(acpi_device_bus_id); |
| 718 | goto err_unlock; |
| 719 | } |
| 720 | |
| 721 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); |
| 722 | } |
| 723 | |
| 724 | if (device->wakeup.flags.valid) |
| 725 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); |
| 726 | |
| 727 | acpi_store_pld_crc(device); |
| 728 | |
| 729 | mutex_unlock(&acpi_device_lock); |
| 730 | |
| 731 | result = device_add(&device->dev); |
| 732 | if (result) { |
| 733 | dev_err(&device->dev, "Error registering device\n"); |
| 734 | goto err; |
| 735 | } |
| 736 | |
| 737 | result = acpi_device_setup_files(device); |
| 738 | if (result) |
| 739 | pr_err("Error creating sysfs interface for device %s\n", |
| 740 | dev_name(&device->dev)); |
| 741 | |
| 742 | return 0; |
| 743 | |
| 744 | err: |
| 745 | mutex_lock(&acpi_device_lock); |
| 746 | |
| 747 | list_del(&device->wakeup_list); |
| 748 | |
| 749 | err_unlock: |
| 750 | mutex_unlock(&acpi_device_lock); |
| 751 | |
| 752 | acpi_detach_data(device->handle, acpi_scan_drop_device); |
| 753 | |
| 754 | return result; |
| 755 | } |
| 756 | |
| 757 | /* -------------------------------------------------------------------------- |
| 758 | Device Enumeration |
| 759 | -------------------------------------------------------------------------- */ |
| 760 | static bool acpi_info_matches_ids(struct acpi_device_info *info, |
| 761 | const char * const ids[]) |
| 762 | { |
| 763 | struct acpi_pnp_device_id_list *cid_list = NULL; |
| 764 | int i, index; |
| 765 | |
| 766 | if (!(info->valid & ACPI_VALID_HID)) |
| 767 | return false; |
| 768 | |
| 769 | index = match_string(ids, -1, info->hardware_id.string); |
| 770 | if (index >= 0) |
| 771 | return true; |
| 772 | |
| 773 | if (info->valid & ACPI_VALID_CID) |
| 774 | cid_list = &info->compatible_id_list; |
| 775 | |
| 776 | if (!cid_list) |
| 777 | return false; |
| 778 | |
| 779 | for (i = 0; i < cid_list->count; i++) { |
| 780 | index = match_string(ids, -1, cid_list->ids[i].string); |
| 781 | if (index >= 0) |
| 782 | return true; |
| 783 | } |
| 784 | |
| 785 | return false; |
| 786 | } |
| 787 | |
| 788 | /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */ |
| 789 | static const char * const acpi_ignore_dep_ids[] = { |
| 790 | "PNP0D80", /* Windows-compatible System Power Management Controller */ |
| 791 | "INT33BD", /* Intel Baytrail Mailbox Device */ |
| 792 | "LATT2021", /* Lattice FW Update Client Driver */ |
| 793 | NULL |
| 794 | }; |
| 795 | |
| 796 | /* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */ |
| 797 | static const char * const acpi_honor_dep_ids[] = { |
| 798 | "INT3472", /* Camera sensor PMIC / clk and regulator info */ |
| 799 | NULL |
| 800 | }; |
| 801 | |
| 802 | static struct acpi_device *acpi_find_parent_acpi_dev(acpi_handle handle) |
| 803 | { |
| 804 | struct acpi_device *adev; |
| 805 | |
| 806 | /* |
| 807 | * Fixed hardware devices do not appear in the namespace and do not |
| 808 | * have handles, but we fabricate acpi_devices for them, so we have |
| 809 | * to deal with them specially. |
| 810 | */ |
| 811 | if (!handle) |
| 812 | return acpi_root; |
| 813 | |
| 814 | do { |
| 815 | acpi_status status; |
| 816 | |
| 817 | status = acpi_get_parent(handle, &handle); |
| 818 | if (ACPI_FAILURE(status)) { |
| 819 | if (status != AE_NULL_ENTRY) |
| 820 | return acpi_root; |
| 821 | |
| 822 | return NULL; |
| 823 | } |
| 824 | adev = acpi_fetch_acpi_dev(handle); |
| 825 | } while (!adev); |
| 826 | return adev; |
| 827 | } |
| 828 | |
| 829 | acpi_status |
| 830 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) |
| 831 | { |
| 832 | acpi_status status; |
| 833 | acpi_handle tmp; |
| 834 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
| 835 | union acpi_object *obj; |
| 836 | |
| 837 | status = acpi_get_handle(handle, "_EJD", &tmp); |
| 838 | if (ACPI_FAILURE(status)) |
| 839 | return status; |
| 840 | |
| 841 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); |
| 842 | if (ACPI_SUCCESS(status)) { |
| 843 | obj = buffer.pointer; |
| 844 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
| 845 | ejd); |
| 846 | kfree(buffer.pointer); |
| 847 | } |
| 848 | return status; |
| 849 | } |
| 850 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); |
| 851 | |
| 852 | static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev) |
| 853 | { |
| 854 | acpi_handle handle = dev->handle; |
| 855 | struct acpi_device_wakeup *wakeup = &dev->wakeup; |
| 856 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 857 | union acpi_object *package = NULL; |
| 858 | union acpi_object *element = NULL; |
| 859 | acpi_status status; |
| 860 | int err = -ENODATA; |
| 861 | |
| 862 | INIT_LIST_HEAD(&wakeup->resources); |
| 863 | |
| 864 | /* _PRW */ |
| 865 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); |
| 866 | if (ACPI_FAILURE(status)) { |
| 867 | acpi_handle_info(handle, "_PRW evaluation failed: %s\n", |
| 868 | acpi_format_exception(status)); |
| 869 | return err; |
| 870 | } |
| 871 | |
| 872 | package = (union acpi_object *)buffer.pointer; |
| 873 | |
| 874 | if (!package || package->package.count < 2) |
| 875 | goto out; |
| 876 | |
| 877 | element = &(package->package.elements[0]); |
| 878 | if (!element) |
| 879 | goto out; |
| 880 | |
| 881 | if (element->type == ACPI_TYPE_PACKAGE) { |
| 882 | if ((element->package.count < 2) || |
| 883 | (element->package.elements[0].type != |
| 884 | ACPI_TYPE_LOCAL_REFERENCE) |
| 885 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
| 886 | goto out; |
| 887 | |
| 888 | wakeup->gpe_device = |
| 889 | element->package.elements[0].reference.handle; |
| 890 | wakeup->gpe_number = |
| 891 | (u32) element->package.elements[1].integer.value; |
| 892 | } else if (element->type == ACPI_TYPE_INTEGER) { |
| 893 | wakeup->gpe_device = NULL; |
| 894 | wakeup->gpe_number = element->integer.value; |
| 895 | } else { |
| 896 | goto out; |
| 897 | } |
| 898 | |
| 899 | element = &(package->package.elements[1]); |
| 900 | if (element->type != ACPI_TYPE_INTEGER) |
| 901 | goto out; |
| 902 | |
| 903 | wakeup->sleep_state = element->integer.value; |
| 904 | |
| 905 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
| 906 | if (err) |
| 907 | goto out; |
| 908 | |
| 909 | if (!list_empty(&wakeup->resources)) { |
| 910 | int sleep_state; |
| 911 | |
| 912 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
| 913 | &sleep_state); |
| 914 | if (err) { |
| 915 | acpi_handle_warn(handle, "Retrieving current states " |
| 916 | "of wakeup power resources failed\n"); |
| 917 | acpi_power_resources_list_free(&wakeup->resources); |
| 918 | goto out; |
| 919 | } |
| 920 | if (sleep_state < wakeup->sleep_state) { |
| 921 | acpi_handle_warn(handle, "Overriding _PRW sleep state " |
| 922 | "(S%d) by S%d from power resources\n", |
| 923 | (int)wakeup->sleep_state, sleep_state); |
| 924 | wakeup->sleep_state = sleep_state; |
| 925 | } |
| 926 | } |
| 927 | |
| 928 | out: |
| 929 | kfree(buffer.pointer); |
| 930 | return err; |
| 931 | } |
| 932 | |
| 933 | static bool acpi_wakeup_gpe_init(struct acpi_device *device) |
| 934 | { |
| 935 | static const struct acpi_device_id button_device_ids[] = { |
| 936 | {"PNP0C0C", 0}, /* Power button */ |
| 937 | {"PNP0C0D", 0}, /* Lid */ |
| 938 | {"PNP0C0E", 0}, /* Sleep button */ |
| 939 | {"", 0}, |
| 940 | }; |
| 941 | struct acpi_device_wakeup *wakeup = &device->wakeup; |
| 942 | acpi_status status; |
| 943 | |
| 944 | wakeup->flags.notifier_present = 0; |
| 945 | |
| 946 | /* Power button, Lid switch always enable wakeup */ |
| 947 | if (!acpi_match_device_ids(device, button_device_ids)) { |
| 948 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
| 949 | /* Do not use Lid/sleep button for S5 wakeup */ |
| 950 | if (wakeup->sleep_state == ACPI_STATE_S5) |
| 951 | wakeup->sleep_state = ACPI_STATE_S4; |
| 952 | } |
| 953 | acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number); |
| 954 | device_set_wakeup_capable(&device->dev, true); |
| 955 | return true; |
| 956 | } |
| 957 | |
| 958 | status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device, |
| 959 | wakeup->gpe_number); |
| 960 | return ACPI_SUCCESS(status); |
| 961 | } |
| 962 | |
| 963 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
| 964 | { |
| 965 | int err; |
| 966 | |
| 967 | /* Presence of _PRW indicates wake capable */ |
| 968 | if (!acpi_has_method(device->handle, "_PRW")) |
| 969 | return; |
| 970 | |
| 971 | err = acpi_bus_extract_wakeup_device_power_package(device); |
| 972 | if (err) { |
| 973 | dev_err(&device->dev, "Unable to extract wakeup power resources"); |
| 974 | return; |
| 975 | } |
| 976 | |
| 977 | device->wakeup.flags.valid = acpi_wakeup_gpe_init(device); |
| 978 | device->wakeup.prepare_count = 0; |
| 979 | /* |
| 980 | * Call _PSW/_DSW object to disable its ability to wake the sleeping |
| 981 | * system for the ACPI device with the _PRW object. |
| 982 | * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW. |
| 983 | * So it is necessary to call _DSW object first. Only when it is not |
| 984 | * present will the _PSW object used. |
| 985 | */ |
| 986 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
| 987 | if (err) |
| 988 | pr_debug("error in _DSW or _PSW evaluation\n"); |
| 989 | } |
| 990 | |
| 991 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
| 992 | { |
| 993 | struct acpi_device_power_state *ps = &device->power.states[state]; |
| 994 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
| 995 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 996 | acpi_status status; |
| 997 | |
| 998 | INIT_LIST_HEAD(&ps->resources); |
| 999 | |
| 1000 | /* Evaluate "_PRx" to get referenced power resources */ |
| 1001 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); |
| 1002 | if (ACPI_SUCCESS(status)) { |
| 1003 | union acpi_object *package = buffer.pointer; |
| 1004 | |
| 1005 | if (buffer.length && package |
| 1006 | && package->type == ACPI_TYPE_PACKAGE |
| 1007 | && package->package.count) |
| 1008 | acpi_extract_power_resources(package, 0, &ps->resources); |
| 1009 | |
| 1010 | ACPI_FREE(buffer.pointer); |
| 1011 | } |
| 1012 | |
| 1013 | /* Evaluate "_PSx" to see if we can do explicit sets */ |
| 1014 | pathname[2] = 'S'; |
| 1015 | if (acpi_has_method(device->handle, pathname)) |
| 1016 | ps->flags.explicit_set = 1; |
| 1017 | |
| 1018 | /* State is valid if there are means to put the device into it. */ |
| 1019 | if (!list_empty(&ps->resources) || ps->flags.explicit_set) |
| 1020 | ps->flags.valid = 1; |
| 1021 | |
| 1022 | ps->power = -1; /* Unknown - driver assigned */ |
| 1023 | ps->latency = -1; /* Unknown - driver assigned */ |
| 1024 | } |
| 1025 | |
| 1026 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
| 1027 | { |
| 1028 | unsigned long long dsc = ACPI_STATE_D0; |
| 1029 | u32 i; |
| 1030 | |
| 1031 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
| 1032 | if (!acpi_has_method(device->handle, "_PS0") && |
| 1033 | !acpi_has_method(device->handle, "_PR0")) |
| 1034 | return; |
| 1035 | |
| 1036 | device->flags.power_manageable = 1; |
| 1037 | |
| 1038 | /* |
| 1039 | * Power Management Flags |
| 1040 | */ |
| 1041 | if (acpi_has_method(device->handle, "_PSC")) |
| 1042 | device->power.flags.explicit_get = 1; |
| 1043 | |
| 1044 | if (acpi_has_method(device->handle, "_IRC")) |
| 1045 | device->power.flags.inrush_current = 1; |
| 1046 | |
| 1047 | if (acpi_has_method(device->handle, "_DSW")) |
| 1048 | device->power.flags.dsw_present = 1; |
| 1049 | |
| 1050 | acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc); |
| 1051 | device->power.state_for_enumeration = dsc; |
| 1052 | |
| 1053 | /* |
| 1054 | * Enumerate supported power management states |
| 1055 | */ |
| 1056 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
| 1057 | acpi_bus_init_power_state(device, i); |
| 1058 | |
| 1059 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
| 1060 | |
| 1061 | /* Set the defaults for D0 and D3hot (always supported). */ |
| 1062 | device->power.states[ACPI_STATE_D0].flags.valid = 1; |
| 1063 | device->power.states[ACPI_STATE_D0].power = 100; |
| 1064 | device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1; |
| 1065 | |
| 1066 | /* |
| 1067 | * Use power resources only if the D0 list of them is populated, because |
| 1068 | * some platforms may provide _PR3 only to indicate D3cold support and |
| 1069 | * in those cases the power resources list returned by it may be bogus. |
| 1070 | */ |
| 1071 | if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) { |
| 1072 | device->power.flags.power_resources = 1; |
| 1073 | /* |
| 1074 | * D3cold is supported if the D3hot list of power resources is |
| 1075 | * not empty. |
| 1076 | */ |
| 1077 | if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources)) |
| 1078 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; |
| 1079 | } |
| 1080 | |
| 1081 | if (acpi_bus_init_power(device)) |
| 1082 | device->flags.power_manageable = 0; |
| 1083 | } |
| 1084 | |
| 1085 | static void acpi_bus_get_flags(struct acpi_device *device) |
| 1086 | { |
| 1087 | /* Presence of _STA indicates 'dynamic_status' */ |
| 1088 | if (acpi_has_method(device->handle, "_STA")) |
| 1089 | device->flags.dynamic_status = 1; |
| 1090 | |
| 1091 | /* Presence of _RMV indicates 'removable' */ |
| 1092 | if (acpi_has_method(device->handle, "_RMV")) |
| 1093 | device->flags.removable = 1; |
| 1094 | |
| 1095 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ |
| 1096 | if (acpi_has_method(device->handle, "_EJD") || |
| 1097 | acpi_has_method(device->handle, "_EJ0")) |
| 1098 | device->flags.ejectable = 1; |
| 1099 | } |
| 1100 | |
| 1101 | static void acpi_device_get_busid(struct acpi_device *device) |
| 1102 | { |
| 1103 | char bus_id[5] = { '?', 0 }; |
| 1104 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; |
| 1105 | int i = 0; |
| 1106 | |
| 1107 | /* |
| 1108 | * Bus ID |
| 1109 | * ------ |
| 1110 | * The device's Bus ID is simply the object name. |
| 1111 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? |
| 1112 | */ |
| 1113 | if (!acpi_dev_parent(device)) { |
| 1114 | strcpy(device->pnp.bus_id, "ACPI"); |
| 1115 | return; |
| 1116 | } |
| 1117 | |
| 1118 | switch (device->device_type) { |
| 1119 | case ACPI_BUS_TYPE_POWER_BUTTON: |
| 1120 | strcpy(device->pnp.bus_id, "PWRF"); |
| 1121 | break; |
| 1122 | case ACPI_BUS_TYPE_SLEEP_BUTTON: |
| 1123 | strcpy(device->pnp.bus_id, "SLPF"); |
| 1124 | break; |
| 1125 | case ACPI_BUS_TYPE_ECDT_EC: |
| 1126 | strcpy(device->pnp.bus_id, "ECDT"); |
| 1127 | break; |
| 1128 | default: |
| 1129 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
| 1130 | /* Clean up trailing underscores (if any) */ |
| 1131 | for (i = 3; i > 1; i--) { |
| 1132 | if (bus_id[i] == '_') |
| 1133 | bus_id[i] = '\0'; |
| 1134 | else |
| 1135 | break; |
| 1136 | } |
| 1137 | strcpy(device->pnp.bus_id, bus_id); |
| 1138 | break; |
| 1139 | } |
| 1140 | } |
| 1141 | |
| 1142 | /* |
| 1143 | * acpi_ata_match - see if an acpi object is an ATA device |
| 1144 | * |
| 1145 | * If an acpi object has one of the ACPI ATA methods defined, |
| 1146 | * then we can safely call it an ATA device. |
| 1147 | */ |
| 1148 | bool acpi_ata_match(acpi_handle handle) |
| 1149 | { |
| 1150 | return acpi_has_method(handle, "_GTF") || |
| 1151 | acpi_has_method(handle, "_GTM") || |
| 1152 | acpi_has_method(handle, "_STM") || |
| 1153 | acpi_has_method(handle, "_SDD"); |
| 1154 | } |
| 1155 | |
| 1156 | /* |
| 1157 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
| 1158 | * |
| 1159 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, |
| 1160 | * then we can safely call it an ejectable drive bay |
| 1161 | */ |
| 1162 | bool acpi_bay_match(acpi_handle handle) |
| 1163 | { |
| 1164 | acpi_handle phandle; |
| 1165 | |
| 1166 | if (!acpi_has_method(handle, "_EJ0")) |
| 1167 | return false; |
| 1168 | if (acpi_ata_match(handle)) |
| 1169 | return true; |
| 1170 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) |
| 1171 | return false; |
| 1172 | |
| 1173 | return acpi_ata_match(phandle); |
| 1174 | } |
| 1175 | |
| 1176 | bool acpi_device_is_battery(struct acpi_device *adev) |
| 1177 | { |
| 1178 | struct acpi_hardware_id *hwid; |
| 1179 | |
| 1180 | list_for_each_entry(hwid, &adev->pnp.ids, list) |
| 1181 | if (!strcmp("PNP0C0A", hwid->id)) |
| 1182 | return true; |
| 1183 | |
| 1184 | return false; |
| 1185 | } |
| 1186 | |
| 1187 | static bool is_ejectable_bay(struct acpi_device *adev) |
| 1188 | { |
| 1189 | acpi_handle handle = adev->handle; |
| 1190 | |
| 1191 | if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev)) |
| 1192 | return true; |
| 1193 | |
| 1194 | return acpi_bay_match(handle); |
| 1195 | } |
| 1196 | |
| 1197 | /* |
| 1198 | * acpi_dock_match - see if an acpi object has a _DCK method |
| 1199 | */ |
| 1200 | bool acpi_dock_match(acpi_handle handle) |
| 1201 | { |
| 1202 | return acpi_has_method(handle, "_DCK"); |
| 1203 | } |
| 1204 | |
| 1205 | static acpi_status |
| 1206 | acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context, |
| 1207 | void **return_value) |
| 1208 | { |
| 1209 | long *cap = context; |
| 1210 | |
| 1211 | if (acpi_has_method(handle, "_BCM") && |
| 1212 | acpi_has_method(handle, "_BCL")) { |
| 1213 | acpi_handle_debug(handle, "Found generic backlight support\n"); |
| 1214 | *cap |= ACPI_VIDEO_BACKLIGHT; |
| 1215 | /* We have backlight support, no need to scan further */ |
| 1216 | return AE_CTRL_TERMINATE; |
| 1217 | } |
| 1218 | return 0; |
| 1219 | } |
| 1220 | |
| 1221 | /* Returns true if the ACPI object is a video device which can be |
| 1222 | * handled by video.ko. |
| 1223 | * The device will get a Linux specific CID added in scan.c to |
| 1224 | * identify the device as an ACPI graphics device |
| 1225 | * Be aware that the graphics device may not be physically present |
| 1226 | * Use acpi_video_get_capabilities() to detect general ACPI video |
| 1227 | * capabilities of present cards |
| 1228 | */ |
| 1229 | long acpi_is_video_device(acpi_handle handle) |
| 1230 | { |
| 1231 | long video_caps = 0; |
| 1232 | |
| 1233 | /* Is this device able to support video switching ? */ |
| 1234 | if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS")) |
| 1235 | video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING; |
| 1236 | |
| 1237 | /* Is this device able to retrieve a video ROM ? */ |
| 1238 | if (acpi_has_method(handle, "_ROM")) |
| 1239 | video_caps |= ACPI_VIDEO_ROM_AVAILABLE; |
| 1240 | |
| 1241 | /* Is this device able to configure which video head to be POSTed ? */ |
| 1242 | if (acpi_has_method(handle, "_VPO") && |
| 1243 | acpi_has_method(handle, "_GPD") && |
| 1244 | acpi_has_method(handle, "_SPD")) |
| 1245 | video_caps |= ACPI_VIDEO_DEVICE_POSTING; |
| 1246 | |
| 1247 | /* Only check for backlight functionality if one of the above hit. */ |
| 1248 | if (video_caps) |
| 1249 | acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, |
| 1250 | ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL, |
| 1251 | &video_caps, NULL); |
| 1252 | |
| 1253 | return video_caps; |
| 1254 | } |
| 1255 | EXPORT_SYMBOL(acpi_is_video_device); |
| 1256 | |
| 1257 | const char *acpi_device_hid(struct acpi_device *device) |
| 1258 | { |
| 1259 | struct acpi_hardware_id *hid; |
| 1260 | |
| 1261 | if (list_empty(&device->pnp.ids)) |
| 1262 | return dummy_hid; |
| 1263 | |
| 1264 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
| 1265 | return hid->id; |
| 1266 | } |
| 1267 | EXPORT_SYMBOL(acpi_device_hid); |
| 1268 | |
| 1269 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
| 1270 | { |
| 1271 | struct acpi_hardware_id *id; |
| 1272 | |
| 1273 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
| 1274 | if (!id) |
| 1275 | return; |
| 1276 | |
| 1277 | id->id = kstrdup_const(dev_id, GFP_KERNEL); |
| 1278 | if (!id->id) { |
| 1279 | kfree(id); |
| 1280 | return; |
| 1281 | } |
| 1282 | |
| 1283 | list_add_tail(&id->list, &pnp->ids); |
| 1284 | pnp->type.hardware_id = 1; |
| 1285 | } |
| 1286 | |
| 1287 | /* |
| 1288 | * Old IBM workstations have a DSDT bug wherein the SMBus object |
| 1289 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" |
| 1290 | * prefix. Work around this. |
| 1291 | */ |
| 1292 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
| 1293 | { |
| 1294 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
| 1295 | struct acpi_buffer path = { sizeof(node_name), node_name }; |
| 1296 | |
| 1297 | if (!dmi_name_in_vendors("IBM")) |
| 1298 | return false; |
| 1299 | |
| 1300 | /* Look for SMBS object */ |
| 1301 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
| 1302 | strcmp("SMBS", path.pointer)) |
| 1303 | return false; |
| 1304 | |
| 1305 | /* Does it have the necessary (but misnamed) methods? */ |
| 1306 | if (acpi_has_method(handle, "SBI") && |
| 1307 | acpi_has_method(handle, "SBR") && |
| 1308 | acpi_has_method(handle, "SBW")) |
| 1309 | return true; |
| 1310 | |
| 1311 | return false; |
| 1312 | } |
| 1313 | |
| 1314 | static bool acpi_object_is_system_bus(acpi_handle handle) |
| 1315 | { |
| 1316 | acpi_handle tmp; |
| 1317 | |
| 1318 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) && |
| 1319 | tmp == handle) |
| 1320 | return true; |
| 1321 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) && |
| 1322 | tmp == handle) |
| 1323 | return true; |
| 1324 | |
| 1325 | return false; |
| 1326 | } |
| 1327 | |
| 1328 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
| 1329 | int device_type) |
| 1330 | { |
| 1331 | struct acpi_device_info *info = NULL; |
| 1332 | struct acpi_pnp_device_id_list *cid_list; |
| 1333 | int i; |
| 1334 | |
| 1335 | switch (device_type) { |
| 1336 | case ACPI_BUS_TYPE_DEVICE: |
| 1337 | if (handle == ACPI_ROOT_OBJECT) { |
| 1338 | acpi_add_id(pnp, ACPI_SYSTEM_HID); |
| 1339 | break; |
| 1340 | } |
| 1341 | |
| 1342 | acpi_get_object_info(handle, &info); |
| 1343 | if (!info) { |
| 1344 | pr_err("%s: Error reading device info\n", __func__); |
| 1345 | return; |
| 1346 | } |
| 1347 | |
| 1348 | if (info->valid & ACPI_VALID_HID) { |
| 1349 | acpi_add_id(pnp, info->hardware_id.string); |
| 1350 | pnp->type.platform_id = 1; |
| 1351 | } |
| 1352 | if (info->valid & ACPI_VALID_CID) { |
| 1353 | cid_list = &info->compatible_id_list; |
| 1354 | for (i = 0; i < cid_list->count; i++) |
| 1355 | acpi_add_id(pnp, cid_list->ids[i].string); |
| 1356 | } |
| 1357 | if (info->valid & ACPI_VALID_ADR) { |
| 1358 | pnp->bus_address = info->address; |
| 1359 | pnp->type.bus_address = 1; |
| 1360 | } |
| 1361 | if (info->valid & ACPI_VALID_UID) |
| 1362 | pnp->unique_id = kstrdup(info->unique_id.string, |
| 1363 | GFP_KERNEL); |
| 1364 | if (info->valid & ACPI_VALID_CLS) |
| 1365 | acpi_add_id(pnp, info->class_code.string); |
| 1366 | |
| 1367 | kfree(info); |
| 1368 | |
| 1369 | /* |
| 1370 | * Some devices don't reliably have _HIDs & _CIDs, so add |
| 1371 | * synthetic HIDs to make sure drivers can find them. |
| 1372 | */ |
| 1373 | if (acpi_is_video_device(handle)) |
| 1374 | acpi_add_id(pnp, ACPI_VIDEO_HID); |
| 1375 | else if (acpi_bay_match(handle)) |
| 1376 | acpi_add_id(pnp, ACPI_BAY_HID); |
| 1377 | else if (acpi_dock_match(handle)) |
| 1378 | acpi_add_id(pnp, ACPI_DOCK_HID); |
| 1379 | else if (acpi_ibm_smbus_match(handle)) |
| 1380 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
| 1381 | else if (list_empty(&pnp->ids) && |
| 1382 | acpi_object_is_system_bus(handle)) { |
| 1383 | /* \_SB, \_TZ, LNXSYBUS */ |
| 1384 | acpi_add_id(pnp, ACPI_BUS_HID); |
| 1385 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); |
| 1386 | strcpy(pnp->device_class, ACPI_BUS_CLASS); |
| 1387 | } |
| 1388 | |
| 1389 | break; |
| 1390 | case ACPI_BUS_TYPE_POWER: |
| 1391 | acpi_add_id(pnp, ACPI_POWER_HID); |
| 1392 | break; |
| 1393 | case ACPI_BUS_TYPE_PROCESSOR: |
| 1394 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
| 1395 | break; |
| 1396 | case ACPI_BUS_TYPE_THERMAL: |
| 1397 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
| 1398 | break; |
| 1399 | case ACPI_BUS_TYPE_POWER_BUTTON: |
| 1400 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
| 1401 | break; |
| 1402 | case ACPI_BUS_TYPE_SLEEP_BUTTON: |
| 1403 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
| 1404 | break; |
| 1405 | case ACPI_BUS_TYPE_ECDT_EC: |
| 1406 | acpi_add_id(pnp, ACPI_ECDT_HID); |
| 1407 | break; |
| 1408 | } |
| 1409 | } |
| 1410 | |
| 1411 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
| 1412 | { |
| 1413 | struct acpi_hardware_id *id, *tmp; |
| 1414 | |
| 1415 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { |
| 1416 | kfree_const(id->id); |
| 1417 | kfree(id); |
| 1418 | } |
| 1419 | kfree(pnp->unique_id); |
| 1420 | } |
| 1421 | |
| 1422 | /** |
| 1423 | * acpi_dma_supported - Check DMA support for the specified device. |
| 1424 | * @adev: The pointer to acpi device |
| 1425 | * |
| 1426 | * Return false if DMA is not supported. Otherwise, return true |
| 1427 | */ |
| 1428 | bool acpi_dma_supported(const struct acpi_device *adev) |
| 1429 | { |
| 1430 | if (!adev) |
| 1431 | return false; |
| 1432 | |
| 1433 | if (adev->flags.cca_seen) |
| 1434 | return true; |
| 1435 | |
| 1436 | /* |
| 1437 | * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent |
| 1438 | * DMA on "Intel platforms". Presumably that includes all x86 and |
| 1439 | * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y. |
| 1440 | */ |
| 1441 | if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) |
| 1442 | return true; |
| 1443 | |
| 1444 | return false; |
| 1445 | } |
| 1446 | |
| 1447 | /** |
| 1448 | * acpi_get_dma_attr - Check the supported DMA attr for the specified device. |
| 1449 | * @adev: The pointer to acpi device |
| 1450 | * |
| 1451 | * Return enum dev_dma_attr. |
| 1452 | */ |
| 1453 | enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) |
| 1454 | { |
| 1455 | if (!acpi_dma_supported(adev)) |
| 1456 | return DEV_DMA_NOT_SUPPORTED; |
| 1457 | |
| 1458 | if (adev->flags.coherent_dma) |
| 1459 | return DEV_DMA_COHERENT; |
| 1460 | else |
| 1461 | return DEV_DMA_NON_COHERENT; |
| 1462 | } |
| 1463 | |
| 1464 | /** |
| 1465 | * acpi_dma_get_range() - Get device DMA parameters. |
| 1466 | * |
| 1467 | * @dev: device to configure |
| 1468 | * @map: pointer to DMA ranges result |
| 1469 | * |
| 1470 | * Evaluate DMA regions and return pointer to DMA regions on |
| 1471 | * parsing success; it does not update the passed in values on failure. |
| 1472 | * |
| 1473 | * Return 0 on success, < 0 on failure. |
| 1474 | */ |
| 1475 | int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map) |
| 1476 | { |
| 1477 | struct acpi_device *adev; |
| 1478 | LIST_HEAD(list); |
| 1479 | struct resource_entry *rentry; |
| 1480 | int ret; |
| 1481 | struct device *dma_dev = dev; |
| 1482 | struct bus_dma_region *r; |
| 1483 | |
| 1484 | /* |
| 1485 | * Walk the device tree chasing an ACPI companion with a _DMA |
| 1486 | * object while we go. Stop if we find a device with an ACPI |
| 1487 | * companion containing a _DMA method. |
| 1488 | */ |
| 1489 | do { |
| 1490 | adev = ACPI_COMPANION(dma_dev); |
| 1491 | if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA)) |
| 1492 | break; |
| 1493 | |
| 1494 | dma_dev = dma_dev->parent; |
| 1495 | } while (dma_dev); |
| 1496 | |
| 1497 | if (!dma_dev) |
| 1498 | return -ENODEV; |
| 1499 | |
| 1500 | if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) { |
| 1501 | acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n"); |
| 1502 | return -EINVAL; |
| 1503 | } |
| 1504 | |
| 1505 | ret = acpi_dev_get_dma_resources(adev, &list); |
| 1506 | if (ret > 0) { |
| 1507 | r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL); |
| 1508 | if (!r) { |
| 1509 | ret = -ENOMEM; |
| 1510 | goto out; |
| 1511 | } |
| 1512 | |
| 1513 | *map = r; |
| 1514 | |
| 1515 | list_for_each_entry(rentry, &list, node) { |
| 1516 | if (rentry->res->start >= rentry->res->end) { |
| 1517 | kfree(*map); |
| 1518 | *map = NULL; |
| 1519 | ret = -EINVAL; |
| 1520 | dev_dbg(dma_dev, "Invalid DMA regions configuration\n"); |
| 1521 | goto out; |
| 1522 | } |
| 1523 | |
| 1524 | r->cpu_start = rentry->res->start; |
| 1525 | r->dma_start = rentry->res->start - rentry->offset; |
| 1526 | r->size = resource_size(rentry->res); |
| 1527 | r->offset = rentry->offset; |
| 1528 | r++; |
| 1529 | } |
| 1530 | } |
| 1531 | out: |
| 1532 | acpi_dev_free_resource_list(&list); |
| 1533 | |
| 1534 | return ret >= 0 ? 0 : ret; |
| 1535 | } |
| 1536 | |
| 1537 | #ifdef CONFIG_IOMMU_API |
| 1538 | int acpi_iommu_fwspec_init(struct device *dev, u32 id, |
| 1539 | struct fwnode_handle *fwnode, |
| 1540 | const struct iommu_ops *ops) |
| 1541 | { |
| 1542 | int ret = iommu_fwspec_init(dev, fwnode, ops); |
| 1543 | |
| 1544 | if (!ret) |
| 1545 | ret = iommu_fwspec_add_ids(dev, &id, 1); |
| 1546 | |
| 1547 | return ret; |
| 1548 | } |
| 1549 | |
| 1550 | static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev) |
| 1551 | { |
| 1552 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
| 1553 | |
| 1554 | return fwspec ? fwspec->ops : NULL; |
| 1555 | } |
| 1556 | |
| 1557 | static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, |
| 1558 | const u32 *id_in) |
| 1559 | { |
| 1560 | int err; |
| 1561 | const struct iommu_ops *ops; |
| 1562 | |
| 1563 | /* |
| 1564 | * If we already translated the fwspec there is nothing left to do, |
| 1565 | * return the iommu_ops. |
| 1566 | */ |
| 1567 | ops = acpi_iommu_fwspec_ops(dev); |
| 1568 | if (ops) |
| 1569 | return ops; |
| 1570 | |
| 1571 | err = iort_iommu_configure_id(dev, id_in); |
| 1572 | if (err && err != -EPROBE_DEFER) |
| 1573 | err = viot_iommu_configure(dev); |
| 1574 | |
| 1575 | /* |
| 1576 | * If we have reason to believe the IOMMU driver missed the initial |
| 1577 | * iommu_probe_device() call for dev, replay it to get things in order. |
| 1578 | */ |
| 1579 | if (!err && dev->bus && !device_iommu_mapped(dev)) |
| 1580 | err = iommu_probe_device(dev); |
| 1581 | |
| 1582 | /* Ignore all other errors apart from EPROBE_DEFER */ |
| 1583 | if (err == -EPROBE_DEFER) { |
| 1584 | return ERR_PTR(err); |
| 1585 | } else if (err) { |
| 1586 | dev_dbg(dev, "Adding to IOMMU failed: %d\n", err); |
| 1587 | return NULL; |
| 1588 | } |
| 1589 | return acpi_iommu_fwspec_ops(dev); |
| 1590 | } |
| 1591 | |
| 1592 | #else /* !CONFIG_IOMMU_API */ |
| 1593 | |
| 1594 | int acpi_iommu_fwspec_init(struct device *dev, u32 id, |
| 1595 | struct fwnode_handle *fwnode, |
| 1596 | const struct iommu_ops *ops) |
| 1597 | { |
| 1598 | return -ENODEV; |
| 1599 | } |
| 1600 | |
| 1601 | static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, |
| 1602 | const u32 *id_in) |
| 1603 | { |
| 1604 | return NULL; |
| 1605 | } |
| 1606 | |
| 1607 | #endif /* !CONFIG_IOMMU_API */ |
| 1608 | |
| 1609 | /** |
| 1610 | * acpi_dma_configure_id - Set-up DMA configuration for the device. |
| 1611 | * @dev: The pointer to the device |
| 1612 | * @attr: device dma attributes |
| 1613 | * @input_id: input device id const value pointer |
| 1614 | */ |
| 1615 | int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, |
| 1616 | const u32 *input_id) |
| 1617 | { |
| 1618 | const struct iommu_ops *iommu; |
| 1619 | |
| 1620 | if (attr == DEV_DMA_NOT_SUPPORTED) { |
| 1621 | set_dma_ops(dev, &dma_dummy_ops); |
| 1622 | return 0; |
| 1623 | } |
| 1624 | |
| 1625 | acpi_arch_dma_setup(dev); |
| 1626 | |
| 1627 | iommu = acpi_iommu_configure_id(dev, input_id); |
| 1628 | if (PTR_ERR(iommu) == -EPROBE_DEFER) |
| 1629 | return -EPROBE_DEFER; |
| 1630 | |
| 1631 | arch_setup_dma_ops(dev, 0, U64_MAX, |
| 1632 | iommu, attr == DEV_DMA_COHERENT); |
| 1633 | |
| 1634 | return 0; |
| 1635 | } |
| 1636 | EXPORT_SYMBOL_GPL(acpi_dma_configure_id); |
| 1637 | |
| 1638 | static void acpi_init_coherency(struct acpi_device *adev) |
| 1639 | { |
| 1640 | unsigned long long cca = 0; |
| 1641 | acpi_status status; |
| 1642 | struct acpi_device *parent = acpi_dev_parent(adev); |
| 1643 | |
| 1644 | if (parent && parent->flags.cca_seen) { |
| 1645 | /* |
| 1646 | * From ACPI spec, OSPM will ignore _CCA if an ancestor |
| 1647 | * already saw one. |
| 1648 | */ |
| 1649 | adev->flags.cca_seen = 1; |
| 1650 | cca = parent->flags.coherent_dma; |
| 1651 | } else { |
| 1652 | status = acpi_evaluate_integer(adev->handle, "_CCA", |
| 1653 | NULL, &cca); |
| 1654 | if (ACPI_SUCCESS(status)) |
| 1655 | adev->flags.cca_seen = 1; |
| 1656 | else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) |
| 1657 | /* |
| 1658 | * If architecture does not specify that _CCA is |
| 1659 | * required for DMA-able devices (e.g. x86), |
| 1660 | * we default to _CCA=1. |
| 1661 | */ |
| 1662 | cca = 1; |
| 1663 | else |
| 1664 | acpi_handle_debug(adev->handle, |
| 1665 | "ACPI device is missing _CCA.\n"); |
| 1666 | } |
| 1667 | |
| 1668 | adev->flags.coherent_dma = cca; |
| 1669 | } |
| 1670 | |
| 1671 | static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data) |
| 1672 | { |
| 1673 | bool *is_serial_bus_slave_p = data; |
| 1674 | |
| 1675 | if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) |
| 1676 | return 1; |
| 1677 | |
| 1678 | *is_serial_bus_slave_p = true; |
| 1679 | |
| 1680 | /* no need to do more checking */ |
| 1681 | return -1; |
| 1682 | } |
| 1683 | |
| 1684 | static bool acpi_is_indirect_io_slave(struct acpi_device *device) |
| 1685 | { |
| 1686 | struct acpi_device *parent = acpi_dev_parent(device); |
| 1687 | static const struct acpi_device_id indirect_io_hosts[] = { |
| 1688 | {"HISI0191", 0}, |
| 1689 | {} |
| 1690 | }; |
| 1691 | |
| 1692 | return parent && !acpi_match_device_ids(parent, indirect_io_hosts); |
| 1693 | } |
| 1694 | |
| 1695 | static bool acpi_device_enumeration_by_parent(struct acpi_device *device) |
| 1696 | { |
| 1697 | struct list_head resource_list; |
| 1698 | bool is_serial_bus_slave = false; |
| 1699 | static const struct acpi_device_id ignore_serial_bus_ids[] = { |
| 1700 | /* |
| 1701 | * These devices have multiple SerialBus resources and a client |
| 1702 | * device must be instantiated for each of them, each with |
| 1703 | * its own device id. |
| 1704 | * Normally we only instantiate one client device for the first |
| 1705 | * resource, using the ACPI HID as id. These special cases are handled |
| 1706 | * by the drivers/platform/x86/serial-multi-instantiate.c driver, which |
| 1707 | * knows which client device id to use for each resource. |
| 1708 | */ |
| 1709 | {"BSG1160", }, |
| 1710 | {"BSG2150", }, |
| 1711 | {"CSC3551", }, |
| 1712 | {"INT33FE", }, |
| 1713 | {"INT3515", }, |
| 1714 | /* Non-conforming _HID for Cirrus Logic already released */ |
| 1715 | {"CLSA0100", }, |
| 1716 | {"CLSA0101", }, |
| 1717 | /* |
| 1718 | * Some ACPI devs contain SerialBus resources even though they are not |
| 1719 | * attached to a serial bus at all. |
| 1720 | */ |
| 1721 | {"MSHW0028", }, |
| 1722 | /* |
| 1723 | * HIDs of device with an UartSerialBusV2 resource for which userspace |
| 1724 | * expects a regular tty cdev to be created (instead of the in kernel |
| 1725 | * serdev) and which have a kernel driver which expects a platform_dev |
| 1726 | * such as the rfkill-gpio driver. |
| 1727 | */ |
| 1728 | {"BCM4752", }, |
| 1729 | {"LNV4752", }, |
| 1730 | {} |
| 1731 | }; |
| 1732 | |
| 1733 | if (acpi_is_indirect_io_slave(device)) |
| 1734 | return true; |
| 1735 | |
| 1736 | /* Macs use device properties in lieu of _CRS resources */ |
| 1737 | if (x86_apple_machine && |
| 1738 | (fwnode_property_present(&device->fwnode, "spiSclkPeriod") || |
| 1739 | fwnode_property_present(&device->fwnode, "i2cAddress") || |
| 1740 | fwnode_property_present(&device->fwnode, "baud"))) |
| 1741 | return true; |
| 1742 | |
| 1743 | if (!acpi_match_device_ids(device, ignore_serial_bus_ids)) |
| 1744 | return false; |
| 1745 | |
| 1746 | INIT_LIST_HEAD(&resource_list); |
| 1747 | acpi_dev_get_resources(device, &resource_list, |
| 1748 | acpi_check_serial_bus_slave, |
| 1749 | &is_serial_bus_slave); |
| 1750 | acpi_dev_free_resource_list(&resource_list); |
| 1751 | |
| 1752 | return is_serial_bus_slave; |
| 1753 | } |
| 1754 | |
| 1755 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
| 1756 | int type, void (*release)(struct device *)) |
| 1757 | { |
| 1758 | struct acpi_device *parent = acpi_find_parent_acpi_dev(handle); |
| 1759 | |
| 1760 | INIT_LIST_HEAD(&device->pnp.ids); |
| 1761 | device->device_type = type; |
| 1762 | device->handle = handle; |
| 1763 | device->dev.parent = parent ? &parent->dev : NULL; |
| 1764 | device->dev.release = release; |
| 1765 | device->dev.bus = &acpi_bus_type; |
| 1766 | fwnode_init(&device->fwnode, &acpi_device_fwnode_ops); |
| 1767 | acpi_set_device_status(device, ACPI_STA_DEFAULT); |
| 1768 | acpi_device_get_busid(device); |
| 1769 | acpi_set_pnp_ids(handle, &device->pnp, type); |
| 1770 | acpi_init_properties(device); |
| 1771 | acpi_bus_get_flags(device); |
| 1772 | device->flags.match_driver = false; |
| 1773 | device->flags.initialized = true; |
| 1774 | device->flags.enumeration_by_parent = |
| 1775 | acpi_device_enumeration_by_parent(device); |
| 1776 | acpi_device_clear_enumerated(device); |
| 1777 | device_initialize(&device->dev); |
| 1778 | dev_set_uevent_suppress(&device->dev, true); |
| 1779 | acpi_init_coherency(device); |
| 1780 | } |
| 1781 | |
| 1782 | static void acpi_scan_dep_init(struct acpi_device *adev) |
| 1783 | { |
| 1784 | struct acpi_dep_data *dep; |
| 1785 | |
| 1786 | list_for_each_entry(dep, &acpi_dep_list, node) { |
| 1787 | if (dep->consumer == adev->handle) { |
| 1788 | if (dep->honor_dep) |
| 1789 | adev->flags.honor_deps = 1; |
| 1790 | |
| 1791 | adev->dep_unmet++; |
| 1792 | } |
| 1793 | } |
| 1794 | } |
| 1795 | |
| 1796 | void acpi_device_add_finalize(struct acpi_device *device) |
| 1797 | { |
| 1798 | dev_set_uevent_suppress(&device->dev, false); |
| 1799 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); |
| 1800 | } |
| 1801 | |
| 1802 | static void acpi_scan_init_status(struct acpi_device *adev) |
| 1803 | { |
| 1804 | if (acpi_bus_get_status(adev)) |
| 1805 | acpi_set_device_status(adev, 0); |
| 1806 | } |
| 1807 | |
| 1808 | static int acpi_add_single_object(struct acpi_device **child, |
| 1809 | acpi_handle handle, int type, bool dep_init) |
| 1810 | { |
| 1811 | struct acpi_device *device; |
| 1812 | bool release_dep_lock = false; |
| 1813 | int result; |
| 1814 | |
| 1815 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
| 1816 | if (!device) |
| 1817 | return -ENOMEM; |
| 1818 | |
| 1819 | acpi_init_device_object(device, handle, type, acpi_device_release); |
| 1820 | /* |
| 1821 | * Getting the status is delayed till here so that we can call |
| 1822 | * acpi_bus_get_status() and use its quirk handling. Note that |
| 1823 | * this must be done before the get power-/wakeup_dev-flags calls. |
| 1824 | */ |
| 1825 | if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) { |
| 1826 | if (dep_init) { |
| 1827 | mutex_lock(&acpi_dep_list_lock); |
| 1828 | /* |
| 1829 | * Hold the lock until the acpi_tie_acpi_dev() call |
| 1830 | * below to prevent concurrent acpi_scan_clear_dep() |
| 1831 | * from deleting a dependency list entry without |
| 1832 | * updating dep_unmet for the device. |
| 1833 | */ |
| 1834 | release_dep_lock = true; |
| 1835 | acpi_scan_dep_init(device); |
| 1836 | } |
| 1837 | acpi_scan_init_status(device); |
| 1838 | } |
| 1839 | |
| 1840 | acpi_bus_get_power_flags(device); |
| 1841 | acpi_bus_get_wakeup_device_flags(device); |
| 1842 | |
| 1843 | result = acpi_tie_acpi_dev(device); |
| 1844 | |
| 1845 | if (release_dep_lock) |
| 1846 | mutex_unlock(&acpi_dep_list_lock); |
| 1847 | |
| 1848 | if (!result) |
| 1849 | result = acpi_device_add(device); |
| 1850 | |
| 1851 | if (result) { |
| 1852 | acpi_device_release(&device->dev); |
| 1853 | return result; |
| 1854 | } |
| 1855 | |
| 1856 | acpi_power_add_remove_device(device, true); |
| 1857 | acpi_device_add_finalize(device); |
| 1858 | |
| 1859 | acpi_handle_debug(handle, "Added as %s, parent %s\n", |
| 1860 | dev_name(&device->dev), device->dev.parent ? |
| 1861 | dev_name(device->dev.parent) : "(null)"); |
| 1862 | |
| 1863 | *child = device; |
| 1864 | return 0; |
| 1865 | } |
| 1866 | |
| 1867 | static acpi_status acpi_get_resource_memory(struct acpi_resource *ares, |
| 1868 | void *context) |
| 1869 | { |
| 1870 | struct resource *res = context; |
| 1871 | |
| 1872 | if (acpi_dev_resource_memory(ares, res)) |
| 1873 | return AE_CTRL_TERMINATE; |
| 1874 | |
| 1875 | return AE_OK; |
| 1876 | } |
| 1877 | |
| 1878 | static bool acpi_device_should_be_hidden(acpi_handle handle) |
| 1879 | { |
| 1880 | acpi_status status; |
| 1881 | struct resource res; |
| 1882 | |
| 1883 | /* Check if it should ignore the UART device */ |
| 1884 | if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS))) |
| 1885 | return false; |
| 1886 | |
| 1887 | /* |
| 1888 | * The UART device described in SPCR table is assumed to have only one |
| 1889 | * memory resource present. So we only look for the first one here. |
| 1890 | */ |
| 1891 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
| 1892 | acpi_get_resource_memory, &res); |
| 1893 | if (ACPI_FAILURE(status) || res.start != spcr_uart_addr) |
| 1894 | return false; |
| 1895 | |
| 1896 | acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n", |
| 1897 | &res.start); |
| 1898 | |
| 1899 | return true; |
| 1900 | } |
| 1901 | |
| 1902 | bool acpi_device_is_present(const struct acpi_device *adev) |
| 1903 | { |
| 1904 | return adev->status.present || adev->status.functional; |
| 1905 | } |
| 1906 | |
| 1907 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
| 1908 | const char *idstr, |
| 1909 | const struct acpi_device_id **matchid) |
| 1910 | { |
| 1911 | const struct acpi_device_id *devid; |
| 1912 | |
| 1913 | if (handler->match) |
| 1914 | return handler->match(idstr, matchid); |
| 1915 | |
| 1916 | for (devid = handler->ids; devid->id[0]; devid++) |
| 1917 | if (!strcmp((char *)devid->id, idstr)) { |
| 1918 | if (matchid) |
| 1919 | *matchid = devid; |
| 1920 | |
| 1921 | return true; |
| 1922 | } |
| 1923 | |
| 1924 | return false; |
| 1925 | } |
| 1926 | |
| 1927 | static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr, |
| 1928 | const struct acpi_device_id **matchid) |
| 1929 | { |
| 1930 | struct acpi_scan_handler *handler; |
| 1931 | |
| 1932 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) |
| 1933 | if (acpi_scan_handler_matching(handler, idstr, matchid)) |
| 1934 | return handler; |
| 1935 | |
| 1936 | return NULL; |
| 1937 | } |
| 1938 | |
| 1939 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
| 1940 | { |
| 1941 | if (!!hotplug->enabled == !!val) |
| 1942 | return; |
| 1943 | |
| 1944 | mutex_lock(&acpi_scan_lock); |
| 1945 | |
| 1946 | hotplug->enabled = val; |
| 1947 | |
| 1948 | mutex_unlock(&acpi_scan_lock); |
| 1949 | } |
| 1950 | |
| 1951 | static void acpi_scan_init_hotplug(struct acpi_device *adev) |
| 1952 | { |
| 1953 | struct acpi_hardware_id *hwid; |
| 1954 | |
| 1955 | if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) { |
| 1956 | acpi_dock_add(adev); |
| 1957 | return; |
| 1958 | } |
| 1959 | list_for_each_entry(hwid, &adev->pnp.ids, list) { |
| 1960 | struct acpi_scan_handler *handler; |
| 1961 | |
| 1962 | handler = acpi_scan_match_handler(hwid->id, NULL); |
| 1963 | if (handler) { |
| 1964 | adev->flags.hotplug_notify = true; |
| 1965 | break; |
| 1966 | } |
| 1967 | } |
| 1968 | } |
| 1969 | |
| 1970 | static u32 acpi_scan_check_dep(acpi_handle handle, bool check_dep) |
| 1971 | { |
| 1972 | struct acpi_handle_list dep_devices; |
| 1973 | acpi_status status; |
| 1974 | u32 count; |
| 1975 | int i; |
| 1976 | |
| 1977 | /* |
| 1978 | * Check for _HID here to avoid deferring the enumeration of: |
| 1979 | * 1. PCI devices. |
| 1980 | * 2. ACPI nodes describing USB ports. |
| 1981 | * Still, checking for _HID catches more then just these cases ... |
| 1982 | */ |
| 1983 | if (!check_dep || !acpi_has_method(handle, "_DEP") || |
| 1984 | !acpi_has_method(handle, "_HID")) |
| 1985 | return 0; |
| 1986 | |
| 1987 | status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices); |
| 1988 | if (ACPI_FAILURE(status)) { |
| 1989 | acpi_handle_debug(handle, "Failed to evaluate _DEP.\n"); |
| 1990 | return 0; |
| 1991 | } |
| 1992 | |
| 1993 | for (count = 0, i = 0; i < dep_devices.count; i++) { |
| 1994 | struct acpi_device_info *info; |
| 1995 | struct acpi_dep_data *dep; |
| 1996 | bool skip, honor_dep; |
| 1997 | |
| 1998 | status = acpi_get_object_info(dep_devices.handles[i], &info); |
| 1999 | if (ACPI_FAILURE(status)) { |
| 2000 | acpi_handle_debug(handle, "Error reading _DEP device info\n"); |
| 2001 | continue; |
| 2002 | } |
| 2003 | |
| 2004 | skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids); |
| 2005 | honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids); |
| 2006 | kfree(info); |
| 2007 | |
| 2008 | if (skip) |
| 2009 | continue; |
| 2010 | |
| 2011 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); |
| 2012 | if (!dep) |
| 2013 | continue; |
| 2014 | |
| 2015 | count++; |
| 2016 | |
| 2017 | dep->supplier = dep_devices.handles[i]; |
| 2018 | dep->consumer = handle; |
| 2019 | dep->honor_dep = honor_dep; |
| 2020 | |
| 2021 | mutex_lock(&acpi_dep_list_lock); |
| 2022 | list_add_tail(&dep->node , &acpi_dep_list); |
| 2023 | mutex_unlock(&acpi_dep_list_lock); |
| 2024 | } |
| 2025 | |
| 2026 | return count; |
| 2027 | } |
| 2028 | |
| 2029 | static bool acpi_bus_scan_second_pass; |
| 2030 | |
| 2031 | static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep, |
| 2032 | struct acpi_device **adev_p) |
| 2033 | { |
| 2034 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
| 2035 | acpi_object_type acpi_type; |
| 2036 | int type; |
| 2037 | |
| 2038 | if (device) |
| 2039 | goto out; |
| 2040 | |
| 2041 | if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type))) |
| 2042 | return AE_OK; |
| 2043 | |
| 2044 | switch (acpi_type) { |
| 2045 | case ACPI_TYPE_DEVICE: |
| 2046 | if (acpi_device_should_be_hidden(handle)) |
| 2047 | return AE_OK; |
| 2048 | |
| 2049 | /* Bail out if there are dependencies. */ |
| 2050 | if (acpi_scan_check_dep(handle, check_dep) > 0) { |
| 2051 | acpi_bus_scan_second_pass = true; |
| 2052 | return AE_CTRL_DEPTH; |
| 2053 | } |
| 2054 | |
| 2055 | fallthrough; |
| 2056 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
| 2057 | type = ACPI_BUS_TYPE_DEVICE; |
| 2058 | break; |
| 2059 | |
| 2060 | case ACPI_TYPE_PROCESSOR: |
| 2061 | type = ACPI_BUS_TYPE_PROCESSOR; |
| 2062 | break; |
| 2063 | |
| 2064 | case ACPI_TYPE_THERMAL: |
| 2065 | type = ACPI_BUS_TYPE_THERMAL; |
| 2066 | break; |
| 2067 | |
| 2068 | case ACPI_TYPE_POWER: |
| 2069 | acpi_add_power_resource(handle); |
| 2070 | fallthrough; |
| 2071 | default: |
| 2072 | return AE_OK; |
| 2073 | } |
| 2074 | |
| 2075 | /* |
| 2076 | * If check_dep is true at this point, the device has no dependencies, |
| 2077 | * or the creation of the device object would have been postponed above. |
| 2078 | */ |
| 2079 | acpi_add_single_object(&device, handle, type, !check_dep); |
| 2080 | if (!device) |
| 2081 | return AE_CTRL_DEPTH; |
| 2082 | |
| 2083 | acpi_scan_init_hotplug(device); |
| 2084 | |
| 2085 | out: |
| 2086 | if (!*adev_p) |
| 2087 | *adev_p = device; |
| 2088 | |
| 2089 | return AE_OK; |
| 2090 | } |
| 2091 | |
| 2092 | static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used, |
| 2093 | void *not_used, void **ret_p) |
| 2094 | { |
| 2095 | return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p); |
| 2096 | } |
| 2097 | |
| 2098 | static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used, |
| 2099 | void *not_used, void **ret_p) |
| 2100 | { |
| 2101 | return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p); |
| 2102 | } |
| 2103 | |
| 2104 | static void acpi_default_enumeration(struct acpi_device *device) |
| 2105 | { |
| 2106 | /* |
| 2107 | * Do not enumerate devices with enumeration_by_parent flag set as |
| 2108 | * they will be enumerated by their respective parents. |
| 2109 | */ |
| 2110 | if (!device->flags.enumeration_by_parent) { |
| 2111 | acpi_create_platform_device(device, NULL); |
| 2112 | acpi_device_set_enumerated(device); |
| 2113 | } else { |
| 2114 | blocking_notifier_call_chain(&acpi_reconfig_chain, |
| 2115 | ACPI_RECONFIG_DEVICE_ADD, device); |
| 2116 | } |
| 2117 | } |
| 2118 | |
| 2119 | static const struct acpi_device_id generic_device_ids[] = { |
| 2120 | {ACPI_DT_NAMESPACE_HID, }, |
| 2121 | {"", }, |
| 2122 | }; |
| 2123 | |
| 2124 | static int acpi_generic_device_attach(struct acpi_device *adev, |
| 2125 | const struct acpi_device_id *not_used) |
| 2126 | { |
| 2127 | /* |
| 2128 | * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test |
| 2129 | * below can be unconditional. |
| 2130 | */ |
| 2131 | if (adev->data.of_compatible) |
| 2132 | acpi_default_enumeration(adev); |
| 2133 | |
| 2134 | return 1; |
| 2135 | } |
| 2136 | |
| 2137 | static struct acpi_scan_handler generic_device_handler = { |
| 2138 | .ids = generic_device_ids, |
| 2139 | .attach = acpi_generic_device_attach, |
| 2140 | }; |
| 2141 | |
| 2142 | static int acpi_scan_attach_handler(struct acpi_device *device) |
| 2143 | { |
| 2144 | struct acpi_hardware_id *hwid; |
| 2145 | int ret = 0; |
| 2146 | |
| 2147 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
| 2148 | const struct acpi_device_id *devid; |
| 2149 | struct acpi_scan_handler *handler; |
| 2150 | |
| 2151 | handler = acpi_scan_match_handler(hwid->id, &devid); |
| 2152 | if (handler) { |
| 2153 | if (!handler->attach) { |
| 2154 | device->pnp.type.platform_id = 0; |
| 2155 | continue; |
| 2156 | } |
| 2157 | device->handler = handler; |
| 2158 | ret = handler->attach(device, devid); |
| 2159 | if (ret > 0) |
| 2160 | break; |
| 2161 | |
| 2162 | device->handler = NULL; |
| 2163 | if (ret < 0) |
| 2164 | break; |
| 2165 | } |
| 2166 | } |
| 2167 | |
| 2168 | return ret; |
| 2169 | } |
| 2170 | |
| 2171 | static int acpi_bus_attach(struct acpi_device *device, void *first_pass) |
| 2172 | { |
| 2173 | bool skip = !first_pass && device->flags.visited; |
| 2174 | acpi_handle ejd; |
| 2175 | int ret; |
| 2176 | |
| 2177 | if (skip) |
| 2178 | goto ok; |
| 2179 | |
| 2180 | if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd))) |
| 2181 | register_dock_dependent_device(device, ejd); |
| 2182 | |
| 2183 | acpi_bus_get_status(device); |
| 2184 | /* Skip devices that are not ready for enumeration (e.g. not present) */ |
| 2185 | if (!acpi_dev_ready_for_enumeration(device)) { |
| 2186 | device->flags.initialized = false; |
| 2187 | acpi_device_clear_enumerated(device); |
| 2188 | device->flags.power_manageable = 0; |
| 2189 | return 0; |
| 2190 | } |
| 2191 | if (device->handler) |
| 2192 | goto ok; |
| 2193 | |
| 2194 | if (!device->flags.initialized) { |
| 2195 | device->flags.power_manageable = |
| 2196 | device->power.states[ACPI_STATE_D0].flags.valid; |
| 2197 | if (acpi_bus_init_power(device)) |
| 2198 | device->flags.power_manageable = 0; |
| 2199 | |
| 2200 | device->flags.initialized = true; |
| 2201 | } else if (device->flags.visited) { |
| 2202 | goto ok; |
| 2203 | } |
| 2204 | |
| 2205 | ret = acpi_scan_attach_handler(device); |
| 2206 | if (ret < 0) |
| 2207 | return 0; |
| 2208 | |
| 2209 | device->flags.match_driver = true; |
| 2210 | if (ret > 0 && !device->flags.enumeration_by_parent) { |
| 2211 | acpi_device_set_enumerated(device); |
| 2212 | goto ok; |
| 2213 | } |
| 2214 | |
| 2215 | ret = device_attach(&device->dev); |
| 2216 | if (ret < 0) |
| 2217 | return 0; |
| 2218 | |
| 2219 | if (device->pnp.type.platform_id || device->flags.enumeration_by_parent) |
| 2220 | acpi_default_enumeration(device); |
| 2221 | else |
| 2222 | acpi_device_set_enumerated(device); |
| 2223 | |
| 2224 | ok: |
| 2225 | acpi_dev_for_each_child(device, acpi_bus_attach, first_pass); |
| 2226 | |
| 2227 | if (!skip && device->handler && device->handler->hotplug.notify_online) |
| 2228 | device->handler->hotplug.notify_online(device); |
| 2229 | |
| 2230 | return 0; |
| 2231 | } |
| 2232 | |
| 2233 | static int acpi_dev_get_next_consumer_dev_cb(struct acpi_dep_data *dep, void *data) |
| 2234 | { |
| 2235 | struct acpi_device **adev_p = data; |
| 2236 | struct acpi_device *adev = *adev_p; |
| 2237 | |
| 2238 | /* |
| 2239 | * If we're passed a 'previous' consumer device then we need to skip |
| 2240 | * any consumers until we meet the previous one, and then NULL @data |
| 2241 | * so the next one can be returned. |
| 2242 | */ |
| 2243 | if (adev) { |
| 2244 | if (dep->consumer == adev->handle) |
| 2245 | *adev_p = NULL; |
| 2246 | |
| 2247 | return 0; |
| 2248 | } |
| 2249 | |
| 2250 | adev = acpi_get_acpi_dev(dep->consumer); |
| 2251 | if (adev) { |
| 2252 | *(struct acpi_device **)data = adev; |
| 2253 | return 1; |
| 2254 | } |
| 2255 | /* Continue parsing if the device object is not present. */ |
| 2256 | return 0; |
| 2257 | } |
| 2258 | |
| 2259 | struct acpi_scan_clear_dep_work { |
| 2260 | struct work_struct work; |
| 2261 | struct acpi_device *adev; |
| 2262 | }; |
| 2263 | |
| 2264 | static void acpi_scan_clear_dep_fn(struct work_struct *work) |
| 2265 | { |
| 2266 | struct acpi_scan_clear_dep_work *cdw; |
| 2267 | |
| 2268 | cdw = container_of(work, struct acpi_scan_clear_dep_work, work); |
| 2269 | |
| 2270 | acpi_scan_lock_acquire(); |
| 2271 | acpi_bus_attach(cdw->adev, (void *)true); |
| 2272 | acpi_scan_lock_release(); |
| 2273 | |
| 2274 | acpi_dev_put(cdw->adev); |
| 2275 | kfree(cdw); |
| 2276 | } |
| 2277 | |
| 2278 | static bool acpi_scan_clear_dep_queue(struct acpi_device *adev) |
| 2279 | { |
| 2280 | struct acpi_scan_clear_dep_work *cdw; |
| 2281 | |
| 2282 | if (adev->dep_unmet) |
| 2283 | return false; |
| 2284 | |
| 2285 | cdw = kmalloc(sizeof(*cdw), GFP_KERNEL); |
| 2286 | if (!cdw) |
| 2287 | return false; |
| 2288 | |
| 2289 | cdw->adev = adev; |
| 2290 | INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn); |
| 2291 | /* |
| 2292 | * Since the work function may block on the lock until the entire |
| 2293 | * initial enumeration of devices is complete, put it into the unbound |
| 2294 | * workqueue. |
| 2295 | */ |
| 2296 | queue_work(system_unbound_wq, &cdw->work); |
| 2297 | |
| 2298 | return true; |
| 2299 | } |
| 2300 | |
| 2301 | static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data) |
| 2302 | { |
| 2303 | struct acpi_device *adev = acpi_get_acpi_dev(dep->consumer); |
| 2304 | |
| 2305 | if (adev) { |
| 2306 | adev->dep_unmet--; |
| 2307 | if (!acpi_scan_clear_dep_queue(adev)) |
| 2308 | acpi_dev_put(adev); |
| 2309 | } |
| 2310 | |
| 2311 | list_del(&dep->node); |
| 2312 | kfree(dep); |
| 2313 | |
| 2314 | return 0; |
| 2315 | } |
| 2316 | |
| 2317 | /** |
| 2318 | * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list |
| 2319 | * @handle: The ACPI handle of the supplier device |
| 2320 | * @callback: Pointer to the callback function to apply |
| 2321 | * @data: Pointer to some data to pass to the callback |
| 2322 | * |
| 2323 | * The return value of the callback determines this function's behaviour. If 0 |
| 2324 | * is returned we continue to iterate over acpi_dep_list. If a positive value |
| 2325 | * is returned then the loop is broken but this function returns 0. If a |
| 2326 | * negative value is returned by the callback then the loop is broken and that |
| 2327 | * value is returned as the final error. |
| 2328 | */ |
| 2329 | static int acpi_walk_dep_device_list(acpi_handle handle, |
| 2330 | int (*callback)(struct acpi_dep_data *, void *), |
| 2331 | void *data) |
| 2332 | { |
| 2333 | struct acpi_dep_data *dep, *tmp; |
| 2334 | int ret = 0; |
| 2335 | |
| 2336 | mutex_lock(&acpi_dep_list_lock); |
| 2337 | list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { |
| 2338 | if (dep->supplier == handle) { |
| 2339 | ret = callback(dep, data); |
| 2340 | if (ret) |
| 2341 | break; |
| 2342 | } |
| 2343 | } |
| 2344 | mutex_unlock(&acpi_dep_list_lock); |
| 2345 | |
| 2346 | return ret > 0 ? 0 : ret; |
| 2347 | } |
| 2348 | |
| 2349 | /** |
| 2350 | * acpi_dev_clear_dependencies - Inform consumers that the device is now active |
| 2351 | * @supplier: Pointer to the supplier &struct acpi_device |
| 2352 | * |
| 2353 | * Clear dependencies on the given device. |
| 2354 | */ |
| 2355 | void acpi_dev_clear_dependencies(struct acpi_device *supplier) |
| 2356 | { |
| 2357 | acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL); |
| 2358 | } |
| 2359 | EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies); |
| 2360 | |
| 2361 | /** |
| 2362 | * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration |
| 2363 | * @device: Pointer to the &struct acpi_device to check |
| 2364 | * |
| 2365 | * Check if the device is present and has no unmet dependencies. |
| 2366 | * |
| 2367 | * Return true if the device is ready for enumeratino. Otherwise, return false. |
| 2368 | */ |
| 2369 | bool acpi_dev_ready_for_enumeration(const struct acpi_device *device) |
| 2370 | { |
| 2371 | if (device->flags.honor_deps && device->dep_unmet) |
| 2372 | return false; |
| 2373 | |
| 2374 | return acpi_device_is_present(device); |
| 2375 | } |
| 2376 | EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration); |
| 2377 | |
| 2378 | /** |
| 2379 | * acpi_dev_get_next_consumer_dev - Return the next adev dependent on @supplier |
| 2380 | * @supplier: Pointer to the dependee device |
| 2381 | * @start: Pointer to the current dependent device |
| 2382 | * |
| 2383 | * Returns the next &struct acpi_device which declares itself dependent on |
| 2384 | * @supplier via the _DEP buffer, parsed from the acpi_dep_list. |
| 2385 | * |
| 2386 | * If the returned adev is not passed as @start to this function, the caller is |
| 2387 | * responsible for putting the reference to adev when it is no longer needed. |
| 2388 | */ |
| 2389 | struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier, |
| 2390 | struct acpi_device *start) |
| 2391 | { |
| 2392 | struct acpi_device *adev = start; |
| 2393 | |
| 2394 | acpi_walk_dep_device_list(supplier->handle, |
| 2395 | acpi_dev_get_next_consumer_dev_cb, &adev); |
| 2396 | |
| 2397 | acpi_dev_put(start); |
| 2398 | |
| 2399 | if (adev == start) |
| 2400 | return NULL; |
| 2401 | |
| 2402 | return adev; |
| 2403 | } |
| 2404 | EXPORT_SYMBOL_GPL(acpi_dev_get_next_consumer_dev); |
| 2405 | |
| 2406 | /** |
| 2407 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
| 2408 | * @handle: Root of the namespace scope to scan. |
| 2409 | * |
| 2410 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
| 2411 | * found devices. |
| 2412 | * |
| 2413 | * If no devices were found, -ENODEV is returned, but it does not mean that |
| 2414 | * there has been a real error. There just have been no suitable ACPI objects |
| 2415 | * in the table trunk from which the kernel could create a device and add an |
| 2416 | * appropriate driver. |
| 2417 | * |
| 2418 | * Must be called under acpi_scan_lock. |
| 2419 | */ |
| 2420 | int acpi_bus_scan(acpi_handle handle) |
| 2421 | { |
| 2422 | struct acpi_device *device = NULL; |
| 2423 | |
| 2424 | acpi_bus_scan_second_pass = false; |
| 2425 | |
| 2426 | /* Pass 1: Avoid enumerating devices with missing dependencies. */ |
| 2427 | |
| 2428 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device))) |
| 2429 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
| 2430 | acpi_bus_check_add_1, NULL, NULL, |
| 2431 | (void **)&device); |
| 2432 | |
| 2433 | if (!device) |
| 2434 | return -ENODEV; |
| 2435 | |
| 2436 | acpi_bus_attach(device, (void *)true); |
| 2437 | |
| 2438 | if (!acpi_bus_scan_second_pass) |
| 2439 | return 0; |
| 2440 | |
| 2441 | /* Pass 2: Enumerate all of the remaining devices. */ |
| 2442 | |
| 2443 | device = NULL; |
| 2444 | |
| 2445 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device))) |
| 2446 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
| 2447 | acpi_bus_check_add_2, NULL, NULL, |
| 2448 | (void **)&device); |
| 2449 | |
| 2450 | acpi_bus_attach(device, NULL); |
| 2451 | |
| 2452 | return 0; |
| 2453 | } |
| 2454 | EXPORT_SYMBOL(acpi_bus_scan); |
| 2455 | |
| 2456 | static int acpi_bus_trim_one(struct acpi_device *adev, void *not_used) |
| 2457 | { |
| 2458 | struct acpi_scan_handler *handler = adev->handler; |
| 2459 | |
| 2460 | acpi_dev_for_each_child_reverse(adev, acpi_bus_trim_one, NULL); |
| 2461 | |
| 2462 | adev->flags.match_driver = false; |
| 2463 | if (handler) { |
| 2464 | if (handler->detach) |
| 2465 | handler->detach(adev); |
| 2466 | |
| 2467 | adev->handler = NULL; |
| 2468 | } else { |
| 2469 | device_release_driver(&adev->dev); |
| 2470 | } |
| 2471 | /* |
| 2472 | * Most likely, the device is going away, so put it into D3cold before |
| 2473 | * that. |
| 2474 | */ |
| 2475 | acpi_device_set_power(adev, ACPI_STATE_D3_COLD); |
| 2476 | adev->flags.initialized = false; |
| 2477 | acpi_device_clear_enumerated(adev); |
| 2478 | |
| 2479 | return 0; |
| 2480 | } |
| 2481 | |
| 2482 | /** |
| 2483 | * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects. |
| 2484 | * @adev: Root of the ACPI namespace scope to walk. |
| 2485 | * |
| 2486 | * Must be called under acpi_scan_lock. |
| 2487 | */ |
| 2488 | void acpi_bus_trim(struct acpi_device *adev) |
| 2489 | { |
| 2490 | acpi_bus_trim_one(adev, NULL); |
| 2491 | } |
| 2492 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
| 2493 | |
| 2494 | int acpi_bus_register_early_device(int type) |
| 2495 | { |
| 2496 | struct acpi_device *device = NULL; |
| 2497 | int result; |
| 2498 | |
| 2499 | result = acpi_add_single_object(&device, NULL, type, false); |
| 2500 | if (result) |
| 2501 | return result; |
| 2502 | |
| 2503 | device->flags.match_driver = true; |
| 2504 | return device_attach(&device->dev); |
| 2505 | } |
| 2506 | EXPORT_SYMBOL_GPL(acpi_bus_register_early_device); |
| 2507 | |
| 2508 | static void acpi_bus_scan_fixed(void) |
| 2509 | { |
| 2510 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
| 2511 | struct acpi_device *adev = NULL; |
| 2512 | |
| 2513 | acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON, |
| 2514 | false); |
| 2515 | if (adev) { |
| 2516 | adev->flags.match_driver = true; |
| 2517 | if (device_attach(&adev->dev) >= 0) |
| 2518 | device_init_wakeup(&adev->dev, true); |
| 2519 | else |
| 2520 | dev_dbg(&adev->dev, "No driver\n"); |
| 2521 | } |
| 2522 | } |
| 2523 | |
| 2524 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
| 2525 | struct acpi_device *adev = NULL; |
| 2526 | |
| 2527 | acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON, |
| 2528 | false); |
| 2529 | if (adev) { |
| 2530 | adev->flags.match_driver = true; |
| 2531 | if (device_attach(&adev->dev) < 0) |
| 2532 | dev_dbg(&adev->dev, "No driver\n"); |
| 2533 | } |
| 2534 | } |
| 2535 | } |
| 2536 | |
| 2537 | static void __init acpi_get_spcr_uart_addr(void) |
| 2538 | { |
| 2539 | acpi_status status; |
| 2540 | struct acpi_table_spcr *spcr_ptr; |
| 2541 | |
| 2542 | status = acpi_get_table(ACPI_SIG_SPCR, 0, |
| 2543 | (struct acpi_table_header **)&spcr_ptr); |
| 2544 | if (ACPI_FAILURE(status)) { |
| 2545 | pr_warn("STAO table present, but SPCR is missing\n"); |
| 2546 | return; |
| 2547 | } |
| 2548 | |
| 2549 | spcr_uart_addr = spcr_ptr->serial_port.address; |
| 2550 | acpi_put_table((struct acpi_table_header *)spcr_ptr); |
| 2551 | } |
| 2552 | |
| 2553 | static bool acpi_scan_initialized; |
| 2554 | |
| 2555 | void __init acpi_scan_init(void) |
| 2556 | { |
| 2557 | acpi_status status; |
| 2558 | struct acpi_table_stao *stao_ptr; |
| 2559 | |
| 2560 | acpi_pci_root_init(); |
| 2561 | acpi_pci_link_init(); |
| 2562 | acpi_processor_init(); |
| 2563 | acpi_platform_init(); |
| 2564 | acpi_lpss_init(); |
| 2565 | acpi_apd_init(); |
| 2566 | acpi_cmos_rtc_init(); |
| 2567 | acpi_container_init(); |
| 2568 | acpi_memory_hotplug_init(); |
| 2569 | acpi_watchdog_init(); |
| 2570 | acpi_pnp_init(); |
| 2571 | acpi_int340x_thermal_init(); |
| 2572 | acpi_amba_init(); |
| 2573 | acpi_init_lpit(); |
| 2574 | |
| 2575 | acpi_scan_add_handler(&generic_device_handler); |
| 2576 | |
| 2577 | /* |
| 2578 | * If there is STAO table, check whether it needs to ignore the UART |
| 2579 | * device in SPCR table. |
| 2580 | */ |
| 2581 | status = acpi_get_table(ACPI_SIG_STAO, 0, |
| 2582 | (struct acpi_table_header **)&stao_ptr); |
| 2583 | if (ACPI_SUCCESS(status)) { |
| 2584 | if (stao_ptr->header.length > sizeof(struct acpi_table_stao)) |
| 2585 | pr_info("STAO Name List not yet supported.\n"); |
| 2586 | |
| 2587 | if (stao_ptr->ignore_uart) |
| 2588 | acpi_get_spcr_uart_addr(); |
| 2589 | |
| 2590 | acpi_put_table((struct acpi_table_header *)stao_ptr); |
| 2591 | } |
| 2592 | |
| 2593 | acpi_gpe_apply_masked_gpes(); |
| 2594 | acpi_update_all_gpes(); |
| 2595 | |
| 2596 | /* |
| 2597 | * Although we call __add_memory() that is documented to require the |
| 2598 | * device_hotplug_lock, it is not necessary here because this is an |
| 2599 | * early code when userspace or any other code path cannot trigger |
| 2600 | * hotplug/hotunplug operations. |
| 2601 | */ |
| 2602 | mutex_lock(&acpi_scan_lock); |
| 2603 | /* |
| 2604 | * Enumerate devices in the ACPI namespace. |
| 2605 | */ |
| 2606 | if (acpi_bus_scan(ACPI_ROOT_OBJECT)) |
| 2607 | goto unlock; |
| 2608 | |
| 2609 | acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT); |
| 2610 | if (!acpi_root) |
| 2611 | goto unlock; |
| 2612 | |
| 2613 | /* Fixed feature devices do not exist on HW-reduced platform */ |
| 2614 | if (!acpi_gbl_reduced_hardware) |
| 2615 | acpi_bus_scan_fixed(); |
| 2616 | |
| 2617 | acpi_turn_off_unused_power_resources(); |
| 2618 | |
| 2619 | acpi_scan_initialized = true; |
| 2620 | |
| 2621 | unlock: |
| 2622 | mutex_unlock(&acpi_scan_lock); |
| 2623 | } |
| 2624 | |
| 2625 | static struct acpi_probe_entry *ape; |
| 2626 | static int acpi_probe_count; |
| 2627 | static DEFINE_MUTEX(acpi_probe_mutex); |
| 2628 | |
| 2629 | static int __init acpi_match_madt(union acpi_subtable_headers *header, |
| 2630 | const unsigned long end) |
| 2631 | { |
| 2632 | if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape)) |
| 2633 | if (!ape->probe_subtbl(header, end)) |
| 2634 | acpi_probe_count++; |
| 2635 | |
| 2636 | return 0; |
| 2637 | } |
| 2638 | |
| 2639 | int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr) |
| 2640 | { |
| 2641 | int count = 0; |
| 2642 | |
| 2643 | if (acpi_disabled) |
| 2644 | return 0; |
| 2645 | |
| 2646 | mutex_lock(&acpi_probe_mutex); |
| 2647 | for (ape = ap_head; nr; ape++, nr--) { |
| 2648 | if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) { |
| 2649 | acpi_probe_count = 0; |
| 2650 | acpi_table_parse_madt(ape->type, acpi_match_madt, 0); |
| 2651 | count += acpi_probe_count; |
| 2652 | } else { |
| 2653 | int res; |
| 2654 | res = acpi_table_parse(ape->id, ape->probe_table); |
| 2655 | if (!res) |
| 2656 | count++; |
| 2657 | } |
| 2658 | } |
| 2659 | mutex_unlock(&acpi_probe_mutex); |
| 2660 | |
| 2661 | return count; |
| 2662 | } |
| 2663 | |
| 2664 | static void acpi_table_events_fn(struct work_struct *work) |
| 2665 | { |
| 2666 | acpi_scan_lock_acquire(); |
| 2667 | acpi_bus_scan(ACPI_ROOT_OBJECT); |
| 2668 | acpi_scan_lock_release(); |
| 2669 | |
| 2670 | kfree(work); |
| 2671 | } |
| 2672 | |
| 2673 | void acpi_scan_table_notify(void) |
| 2674 | { |
| 2675 | struct work_struct *work; |
| 2676 | |
| 2677 | if (!acpi_scan_initialized) |
| 2678 | return; |
| 2679 | |
| 2680 | work = kmalloc(sizeof(*work), GFP_KERNEL); |
| 2681 | if (!work) |
| 2682 | return; |
| 2683 | |
| 2684 | INIT_WORK(work, acpi_table_events_fn); |
| 2685 | schedule_work(work); |
| 2686 | } |
| 2687 | |
| 2688 | int acpi_reconfig_notifier_register(struct notifier_block *nb) |
| 2689 | { |
| 2690 | return blocking_notifier_chain_register(&acpi_reconfig_chain, nb); |
| 2691 | } |
| 2692 | EXPORT_SYMBOL(acpi_reconfig_notifier_register); |
| 2693 | |
| 2694 | int acpi_reconfig_notifier_unregister(struct notifier_block *nb) |
| 2695 | { |
| 2696 | return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb); |
| 2697 | } |
| 2698 | EXPORT_SYMBOL(acpi_reconfig_notifier_unregister); |