| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $) |
| 4 | * |
| 5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| 6 | */ |
| 7 | |
| 8 | #define pr_fmt(fmt) "ACPI: " fmt |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/ioport.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/list.h> |
| 15 | #include <linux/sched.h> |
| 16 | #include <linux/pm.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/proc_fs.h> |
| 19 | #include <linux/acpi.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/regulator/machine.h> |
| 22 | #include <linux/workqueue.h> |
| 23 | #include <linux/reboot.h> |
| 24 | #include <linux/delay.h> |
| 25 | #ifdef CONFIG_X86 |
| 26 | #include <asm/mpspec.h> |
| 27 | #include <linux/dmi.h> |
| 28 | #endif |
| 29 | #include <linux/acpi_viot.h> |
| 30 | #include <linux/pci.h> |
| 31 | #include <acpi/apei.h> |
| 32 | #include <linux/suspend.h> |
| 33 | #include <linux/prmt.h> |
| 34 | |
| 35 | #include "internal.h" |
| 36 | |
| 37 | struct acpi_device *acpi_root; |
| 38 | struct proc_dir_entry *acpi_root_dir; |
| 39 | EXPORT_SYMBOL(acpi_root_dir); |
| 40 | |
| 41 | #ifdef CONFIG_X86 |
| 42 | #ifdef CONFIG_ACPI_CUSTOM_DSDT |
| 43 | static inline int set_copy_dsdt(const struct dmi_system_id *id) |
| 44 | { |
| 45 | return 0; |
| 46 | } |
| 47 | #else |
| 48 | static int set_copy_dsdt(const struct dmi_system_id *id) |
| 49 | { |
| 50 | pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident); |
| 51 | acpi_gbl_copy_dsdt_locally = 1; |
| 52 | return 0; |
| 53 | } |
| 54 | #endif |
| 55 | |
| 56 | static const struct dmi_system_id dsdt_dmi_table[] __initconst = { |
| 57 | /* |
| 58 | * Invoke DSDT corruption work-around on all Toshiba Satellite. |
| 59 | * https://bugzilla.kernel.org/show_bug.cgi?id=14679 |
| 60 | */ |
| 61 | { |
| 62 | .callback = set_copy_dsdt, |
| 63 | .ident = "TOSHIBA Satellite", |
| 64 | .matches = { |
| 65 | DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), |
| 66 | DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"), |
| 67 | }, |
| 68 | }, |
| 69 | {} |
| 70 | }; |
| 71 | #endif |
| 72 | |
| 73 | /* -------------------------------------------------------------------------- |
| 74 | Device Management |
| 75 | -------------------------------------------------------------------------- */ |
| 76 | |
| 77 | acpi_status acpi_bus_get_status_handle(acpi_handle handle, |
| 78 | unsigned long long *sta) |
| 79 | { |
| 80 | acpi_status status; |
| 81 | |
| 82 | status = acpi_evaluate_integer(handle, "_STA", NULL, sta); |
| 83 | if (ACPI_SUCCESS(status)) |
| 84 | return AE_OK; |
| 85 | |
| 86 | if (status == AE_NOT_FOUND) { |
| 87 | *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | |
| 88 | ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; |
| 89 | return AE_OK; |
| 90 | } |
| 91 | return status; |
| 92 | } |
| 93 | EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle); |
| 94 | |
| 95 | int acpi_bus_get_status(struct acpi_device *device) |
| 96 | { |
| 97 | acpi_status status; |
| 98 | unsigned long long sta; |
| 99 | |
| 100 | if (acpi_device_override_status(device, &sta)) { |
| 101 | acpi_set_device_status(device, sta); |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | /* Battery devices must have their deps met before calling _STA */ |
| 106 | if (acpi_device_is_battery(device) && device->dep_unmet) { |
| 107 | acpi_set_device_status(device, 0); |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | status = acpi_bus_get_status_handle(device->handle, &sta); |
| 112 | if (ACPI_FAILURE(status)) |
| 113 | return -ENODEV; |
| 114 | |
| 115 | acpi_set_device_status(device, sta); |
| 116 | |
| 117 | if (device->status.functional && !device->status.present) { |
| 118 | pr_debug("Device [%s] status [%08x]: functional but not present\n", |
| 119 | device->pnp.bus_id, (u32)sta); |
| 120 | } |
| 121 | |
| 122 | pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta); |
| 123 | return 0; |
| 124 | } |
| 125 | EXPORT_SYMBOL(acpi_bus_get_status); |
| 126 | |
| 127 | void acpi_bus_private_data_handler(acpi_handle handle, |
| 128 | void *context) |
| 129 | { |
| 130 | return; |
| 131 | } |
| 132 | EXPORT_SYMBOL(acpi_bus_private_data_handler); |
| 133 | |
| 134 | int acpi_bus_attach_private_data(acpi_handle handle, void *data) |
| 135 | { |
| 136 | acpi_status status; |
| 137 | |
| 138 | status = acpi_attach_data(handle, |
| 139 | acpi_bus_private_data_handler, data); |
| 140 | if (ACPI_FAILURE(status)) { |
| 141 | acpi_handle_debug(handle, "Error attaching device data\n"); |
| 142 | return -ENODEV; |
| 143 | } |
| 144 | |
| 145 | return 0; |
| 146 | } |
| 147 | EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data); |
| 148 | |
| 149 | int acpi_bus_get_private_data(acpi_handle handle, void **data) |
| 150 | { |
| 151 | acpi_status status; |
| 152 | |
| 153 | if (!data) |
| 154 | return -EINVAL; |
| 155 | |
| 156 | status = acpi_get_data(handle, acpi_bus_private_data_handler, data); |
| 157 | if (ACPI_FAILURE(status)) { |
| 158 | acpi_handle_debug(handle, "No context for object\n"); |
| 159 | return -ENODEV; |
| 160 | } |
| 161 | |
| 162 | return 0; |
| 163 | } |
| 164 | EXPORT_SYMBOL_GPL(acpi_bus_get_private_data); |
| 165 | |
| 166 | void acpi_bus_detach_private_data(acpi_handle handle) |
| 167 | { |
| 168 | acpi_detach_data(handle, acpi_bus_private_data_handler); |
| 169 | } |
| 170 | EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data); |
| 171 | |
| 172 | static void acpi_print_osc_error(acpi_handle handle, |
| 173 | struct acpi_osc_context *context, char *error) |
| 174 | { |
| 175 | int i; |
| 176 | |
| 177 | acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error); |
| 178 | |
| 179 | pr_debug("_OSC request data:"); |
| 180 | for (i = 0; i < context->cap.length; i += sizeof(u32)) |
| 181 | pr_debug(" %x", *((u32 *)(context->cap.pointer + i))); |
| 182 | |
| 183 | pr_debug("\n"); |
| 184 | } |
| 185 | |
| 186 | acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) |
| 187 | { |
| 188 | acpi_status status; |
| 189 | struct acpi_object_list input; |
| 190 | union acpi_object in_params[4]; |
| 191 | union acpi_object *out_obj; |
| 192 | guid_t guid; |
| 193 | u32 errors; |
| 194 | struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; |
| 195 | |
| 196 | if (!context) |
| 197 | return AE_ERROR; |
| 198 | if (guid_parse(context->uuid_str, &guid)) |
| 199 | return AE_ERROR; |
| 200 | context->ret.length = ACPI_ALLOCATE_BUFFER; |
| 201 | context->ret.pointer = NULL; |
| 202 | |
| 203 | /* Setting up input parameters */ |
| 204 | input.count = 4; |
| 205 | input.pointer = in_params; |
| 206 | in_params[0].type = ACPI_TYPE_BUFFER; |
| 207 | in_params[0].buffer.length = 16; |
| 208 | in_params[0].buffer.pointer = (u8 *)&guid; |
| 209 | in_params[1].type = ACPI_TYPE_INTEGER; |
| 210 | in_params[1].integer.value = context->rev; |
| 211 | in_params[2].type = ACPI_TYPE_INTEGER; |
| 212 | in_params[2].integer.value = context->cap.length/sizeof(u32); |
| 213 | in_params[3].type = ACPI_TYPE_BUFFER; |
| 214 | in_params[3].buffer.length = context->cap.length; |
| 215 | in_params[3].buffer.pointer = context->cap.pointer; |
| 216 | |
| 217 | status = acpi_evaluate_object(handle, "_OSC", &input, &output); |
| 218 | if (ACPI_FAILURE(status)) |
| 219 | return status; |
| 220 | |
| 221 | if (!output.length) |
| 222 | return AE_NULL_OBJECT; |
| 223 | |
| 224 | out_obj = output.pointer; |
| 225 | if (out_obj->type != ACPI_TYPE_BUFFER |
| 226 | || out_obj->buffer.length != context->cap.length) { |
| 227 | acpi_print_osc_error(handle, context, |
| 228 | "_OSC evaluation returned wrong type"); |
| 229 | status = AE_TYPE; |
| 230 | goto out_kfree; |
| 231 | } |
| 232 | /* Need to ignore the bit0 in result code */ |
| 233 | errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); |
| 234 | if (errors) { |
| 235 | if (errors & OSC_REQUEST_ERROR) |
| 236 | acpi_print_osc_error(handle, context, |
| 237 | "_OSC request failed"); |
| 238 | if (errors & OSC_INVALID_UUID_ERROR) |
| 239 | acpi_print_osc_error(handle, context, |
| 240 | "_OSC invalid UUID"); |
| 241 | if (errors & OSC_INVALID_REVISION_ERROR) |
| 242 | acpi_print_osc_error(handle, context, |
| 243 | "_OSC invalid revision"); |
| 244 | if (errors & OSC_CAPABILITIES_MASK_ERROR) { |
| 245 | if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD] |
| 246 | & OSC_QUERY_ENABLE) |
| 247 | goto out_success; |
| 248 | status = AE_SUPPORT; |
| 249 | goto out_kfree; |
| 250 | } |
| 251 | status = AE_ERROR; |
| 252 | goto out_kfree; |
| 253 | } |
| 254 | out_success: |
| 255 | context->ret.length = out_obj->buffer.length; |
| 256 | context->ret.pointer = kmemdup(out_obj->buffer.pointer, |
| 257 | context->ret.length, GFP_KERNEL); |
| 258 | if (!context->ret.pointer) { |
| 259 | status = AE_NO_MEMORY; |
| 260 | goto out_kfree; |
| 261 | } |
| 262 | status = AE_OK; |
| 263 | |
| 264 | out_kfree: |
| 265 | kfree(output.pointer); |
| 266 | return status; |
| 267 | } |
| 268 | EXPORT_SYMBOL(acpi_run_osc); |
| 269 | |
| 270 | bool osc_sb_apei_support_acked; |
| 271 | |
| 272 | /* |
| 273 | * ACPI 6.0 Section 8.4.4.2 Idle State Coordination |
| 274 | * OSPM supports platform coordinated low power idle(LPI) states |
| 275 | */ |
| 276 | bool osc_pc_lpi_support_confirmed; |
| 277 | EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed); |
| 278 | |
| 279 | /* |
| 280 | * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities': |
| 281 | * Starting with ACPI Specification 6.2, all _CPC registers can be in |
| 282 | * PCC, System Memory, System IO, or Functional Fixed Hardware address |
| 283 | * spaces. OSPM support for this more flexible register space scheme is |
| 284 | * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit. |
| 285 | * |
| 286 | * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in: |
| 287 | * - PCC or Functional Fixed Hardware address space if defined |
| 288 | * - SystemMemory address space (NULL register) if not defined |
| 289 | */ |
| 290 | bool osc_cpc_flexible_adr_space_confirmed; |
| 291 | EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed); |
| 292 | |
| 293 | /* |
| 294 | * ACPI 6.4 Operating System Capabilities for USB. |
| 295 | */ |
| 296 | bool osc_sb_native_usb4_support_confirmed; |
| 297 | EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed); |
| 298 | |
| 299 | bool osc_sb_cppc2_support_acked; |
| 300 | |
| 301 | static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; |
| 302 | static void acpi_bus_osc_negotiate_platform_control(void) |
| 303 | { |
| 304 | u32 capbuf[2], *capbuf_ret; |
| 305 | struct acpi_osc_context context = { |
| 306 | .uuid_str = sb_uuid_str, |
| 307 | .rev = 1, |
| 308 | .cap.length = 8, |
| 309 | .cap.pointer = capbuf, |
| 310 | }; |
| 311 | acpi_handle handle; |
| 312 | |
| 313 | capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; |
| 314 | capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ |
| 315 | if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR)) |
| 316 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT; |
| 317 | if (IS_ENABLED(CONFIG_ACPI_PROCESSOR)) |
| 318 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT; |
| 319 | |
| 320 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT; |
| 321 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT; |
| 322 | if (IS_ENABLED(CONFIG_ACPI_PRMT)) |
| 323 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT; |
| 324 | if (IS_ENABLED(CONFIG_ACPI_FFH)) |
| 325 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_SUPPORT; |
| 326 | |
| 327 | #ifdef CONFIG_ARM64 |
| 328 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT; |
| 329 | #endif |
| 330 | #ifdef CONFIG_X86 |
| 331 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT; |
| 332 | #endif |
| 333 | |
| 334 | #ifdef CONFIG_ACPI_CPPC_LIB |
| 335 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT; |
| 336 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT; |
| 337 | #endif |
| 338 | |
| 339 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE; |
| 340 | |
| 341 | if (IS_ENABLED(CONFIG_SCHED_MC_PRIO)) |
| 342 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT; |
| 343 | |
| 344 | if (IS_ENABLED(CONFIG_USB4)) |
| 345 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT; |
| 346 | |
| 347 | if (!ghes_disable) |
| 348 | capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT; |
| 349 | if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) |
| 350 | return; |
| 351 | |
| 352 | if (ACPI_FAILURE(acpi_run_osc(handle, &context))) |
| 353 | return; |
| 354 | |
| 355 | capbuf_ret = context.ret.pointer; |
| 356 | if (context.ret.length <= OSC_SUPPORT_DWORD) { |
| 357 | kfree(context.ret.pointer); |
| 358 | return; |
| 359 | } |
| 360 | |
| 361 | /* |
| 362 | * Now run _OSC again with query flag clear and with the caps |
| 363 | * supported by both the OS and the platform. |
| 364 | */ |
| 365 | capbuf[OSC_QUERY_DWORD] = 0; |
| 366 | capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD]; |
| 367 | kfree(context.ret.pointer); |
| 368 | |
| 369 | if (ACPI_FAILURE(acpi_run_osc(handle, &context))) |
| 370 | return; |
| 371 | |
| 372 | capbuf_ret = context.ret.pointer; |
| 373 | if (context.ret.length > OSC_SUPPORT_DWORD) { |
| 374 | #ifdef CONFIG_ACPI_CPPC_LIB |
| 375 | osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT; |
| 376 | #endif |
| 377 | |
| 378 | osc_sb_apei_support_acked = |
| 379 | capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT; |
| 380 | osc_pc_lpi_support_confirmed = |
| 381 | capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT; |
| 382 | osc_sb_native_usb4_support_confirmed = |
| 383 | capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT; |
| 384 | osc_cpc_flexible_adr_space_confirmed = |
| 385 | capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE; |
| 386 | } |
| 387 | |
| 388 | kfree(context.ret.pointer); |
| 389 | } |
| 390 | |
| 391 | /* |
| 392 | * Native control of USB4 capabilities. If any of the tunneling bits is |
| 393 | * set it means OS is in control and we use software based connection |
| 394 | * manager. |
| 395 | */ |
| 396 | u32 osc_sb_native_usb4_control; |
| 397 | EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control); |
| 398 | |
| 399 | static void acpi_bus_decode_usb_osc(const char *msg, u32 bits) |
| 400 | { |
| 401 | pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg, |
| 402 | (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-', |
| 403 | (bits & OSC_USB_DP_TUNNELING) ? '+' : '-', |
| 404 | (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-', |
| 405 | (bits & OSC_USB_XDOMAIN) ? '+' : '-'); |
| 406 | } |
| 407 | |
| 408 | static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A"; |
| 409 | static void acpi_bus_osc_negotiate_usb_control(void) |
| 410 | { |
| 411 | u32 capbuf[3], *capbuf_ret; |
| 412 | struct acpi_osc_context context = { |
| 413 | .uuid_str = sb_usb_uuid_str, |
| 414 | .rev = 1, |
| 415 | .cap.length = sizeof(capbuf), |
| 416 | .cap.pointer = capbuf, |
| 417 | }; |
| 418 | acpi_handle handle; |
| 419 | acpi_status status; |
| 420 | u32 control; |
| 421 | |
| 422 | if (!osc_sb_native_usb4_support_confirmed) |
| 423 | return; |
| 424 | |
| 425 | if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) |
| 426 | return; |
| 427 | |
| 428 | control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING | |
| 429 | OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN; |
| 430 | |
| 431 | /* |
| 432 | * Run _OSC first with query bit set, trying to get control over |
| 433 | * all tunneling. The platform can then clear out bits in the |
| 434 | * control dword that it does not want to grant to the OS. |
| 435 | */ |
| 436 | capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; |
| 437 | capbuf[OSC_SUPPORT_DWORD] = 0; |
| 438 | capbuf[OSC_CONTROL_DWORD] = control; |
| 439 | |
| 440 | status = acpi_run_osc(handle, &context); |
| 441 | if (ACPI_FAILURE(status)) |
| 442 | return; |
| 443 | |
| 444 | if (context.ret.length != sizeof(capbuf)) { |
| 445 | pr_info("USB4 _OSC: returned invalid length buffer\n"); |
| 446 | goto out_free; |
| 447 | } |
| 448 | |
| 449 | /* |
| 450 | * Run _OSC again now with query bit clear and the control dword |
| 451 | * matching what the platform granted (which may not have all |
| 452 | * the control bits set). |
| 453 | */ |
| 454 | capbuf_ret = context.ret.pointer; |
| 455 | |
| 456 | capbuf[OSC_QUERY_DWORD] = 0; |
| 457 | capbuf[OSC_CONTROL_DWORD] = capbuf_ret[OSC_CONTROL_DWORD]; |
| 458 | |
| 459 | kfree(context.ret.pointer); |
| 460 | |
| 461 | status = acpi_run_osc(handle, &context); |
| 462 | if (ACPI_FAILURE(status)) |
| 463 | return; |
| 464 | |
| 465 | if (context.ret.length != sizeof(capbuf)) { |
| 466 | pr_info("USB4 _OSC: returned invalid length buffer\n"); |
| 467 | goto out_free; |
| 468 | } |
| 469 | |
| 470 | osc_sb_native_usb4_control = |
| 471 | control & acpi_osc_ctx_get_pci_control(&context); |
| 472 | |
| 473 | acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control); |
| 474 | acpi_bus_decode_usb_osc("USB4 _OSC: OS controls", |
| 475 | osc_sb_native_usb4_control); |
| 476 | |
| 477 | out_free: |
| 478 | kfree(context.ret.pointer); |
| 479 | } |
| 480 | |
| 481 | /* -------------------------------------------------------------------------- |
| 482 | Notification Handling |
| 483 | -------------------------------------------------------------------------- */ |
| 484 | |
| 485 | /** |
| 486 | * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler |
| 487 | * @handle: Target ACPI object. |
| 488 | * @type: Notification type. |
| 489 | * @data: Ignored. |
| 490 | * |
| 491 | * This only handles notifications related to device hotplug. |
| 492 | */ |
| 493 | static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) |
| 494 | { |
| 495 | struct acpi_device *adev; |
| 496 | |
| 497 | switch (type) { |
| 498 | case ACPI_NOTIFY_BUS_CHECK: |
| 499 | acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); |
| 500 | break; |
| 501 | |
| 502 | case ACPI_NOTIFY_DEVICE_CHECK: |
| 503 | acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); |
| 504 | break; |
| 505 | |
| 506 | case ACPI_NOTIFY_DEVICE_WAKE: |
| 507 | acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); |
| 508 | return; |
| 509 | |
| 510 | case ACPI_NOTIFY_EJECT_REQUEST: |
| 511 | acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); |
| 512 | break; |
| 513 | |
| 514 | case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: |
| 515 | acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); |
| 516 | /* TBD: Exactly what does 'light' mean? */ |
| 517 | return; |
| 518 | |
| 519 | case ACPI_NOTIFY_FREQUENCY_MISMATCH: |
| 520 | acpi_handle_err(handle, "Device cannot be configured due " |
| 521 | "to a frequency mismatch\n"); |
| 522 | return; |
| 523 | |
| 524 | case ACPI_NOTIFY_BUS_MODE_MISMATCH: |
| 525 | acpi_handle_err(handle, "Device cannot be configured due " |
| 526 | "to a bus mode mismatch\n"); |
| 527 | return; |
| 528 | |
| 529 | case ACPI_NOTIFY_POWER_FAULT: |
| 530 | acpi_handle_err(handle, "Device has suffered a power fault\n"); |
| 531 | return; |
| 532 | |
| 533 | default: |
| 534 | acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); |
| 535 | return; |
| 536 | } |
| 537 | |
| 538 | adev = acpi_get_acpi_dev(handle); |
| 539 | |
| 540 | if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) |
| 541 | return; |
| 542 | |
| 543 | acpi_put_acpi_dev(adev); |
| 544 | |
| 545 | acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); |
| 546 | } |
| 547 | |
| 548 | static void acpi_notify_device(acpi_handle handle, u32 event, void *data) |
| 549 | { |
| 550 | struct acpi_device *device = data; |
| 551 | struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver); |
| 552 | |
| 553 | acpi_drv->ops.notify(device, event); |
| 554 | } |
| 555 | |
| 556 | static int acpi_device_install_notify_handler(struct acpi_device *device, |
| 557 | struct acpi_driver *acpi_drv) |
| 558 | { |
| 559 | u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ? |
| 560 | ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY; |
| 561 | acpi_status status; |
| 562 | |
| 563 | status = acpi_install_notify_handler(device->handle, type, |
| 564 | acpi_notify_device, device); |
| 565 | if (ACPI_FAILURE(status)) |
| 566 | return -EINVAL; |
| 567 | |
| 568 | return 0; |
| 569 | } |
| 570 | |
| 571 | static void acpi_device_remove_notify_handler(struct acpi_device *device, |
| 572 | struct acpi_driver *acpi_drv) |
| 573 | { |
| 574 | u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ? |
| 575 | ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY; |
| 576 | |
| 577 | acpi_remove_notify_handler(device->handle, type, |
| 578 | acpi_notify_device); |
| 579 | |
| 580 | acpi_os_wait_events_complete(); |
| 581 | } |
| 582 | |
| 583 | int acpi_dev_install_notify_handler(struct acpi_device *adev, |
| 584 | u32 handler_type, |
| 585 | acpi_notify_handler handler, void *context) |
| 586 | { |
| 587 | acpi_status status; |
| 588 | |
| 589 | status = acpi_install_notify_handler(adev->handle, handler_type, |
| 590 | handler, context); |
| 591 | if (ACPI_FAILURE(status)) |
| 592 | return -ENODEV; |
| 593 | |
| 594 | return 0; |
| 595 | } |
| 596 | EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler); |
| 597 | |
| 598 | void acpi_dev_remove_notify_handler(struct acpi_device *adev, |
| 599 | u32 handler_type, |
| 600 | acpi_notify_handler handler) |
| 601 | { |
| 602 | acpi_remove_notify_handler(adev->handle, handler_type, handler); |
| 603 | acpi_os_wait_events_complete(); |
| 604 | } |
| 605 | EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler); |
| 606 | |
| 607 | /* Handle events targeting \_SB device (at present only graceful shutdown) */ |
| 608 | |
| 609 | #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81 |
| 610 | #define ACPI_SB_INDICATE_INTERVAL 10000 |
| 611 | |
| 612 | static void sb_notify_work(struct work_struct *dummy) |
| 613 | { |
| 614 | acpi_handle sb_handle; |
| 615 | |
| 616 | orderly_poweroff(true); |
| 617 | |
| 618 | /* |
| 619 | * After initiating graceful shutdown, the ACPI spec requires OSPM |
| 620 | * to evaluate _OST method once every 10seconds to indicate that |
| 621 | * the shutdown is in progress |
| 622 | */ |
| 623 | acpi_get_handle(NULL, "\\_SB", &sb_handle); |
| 624 | while (1) { |
| 625 | pr_info("Graceful shutdown in progress.\n"); |
| 626 | acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN, |
| 627 | ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL); |
| 628 | msleep(ACPI_SB_INDICATE_INTERVAL); |
| 629 | } |
| 630 | } |
| 631 | |
| 632 | static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) |
| 633 | { |
| 634 | static DECLARE_WORK(acpi_sb_work, sb_notify_work); |
| 635 | |
| 636 | if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) { |
| 637 | if (!work_busy(&acpi_sb_work)) |
| 638 | schedule_work(&acpi_sb_work); |
| 639 | } else { |
| 640 | pr_warn("event %x is not supported by \\_SB device\n", event); |
| 641 | } |
| 642 | } |
| 643 | |
| 644 | static int __init acpi_setup_sb_notify_handler(void) |
| 645 | { |
| 646 | acpi_handle sb_handle; |
| 647 | |
| 648 | if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle))) |
| 649 | return -ENXIO; |
| 650 | |
| 651 | if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY, |
| 652 | acpi_sb_notify, NULL))) |
| 653 | return -EINVAL; |
| 654 | |
| 655 | return 0; |
| 656 | } |
| 657 | |
| 658 | /* -------------------------------------------------------------------------- |
| 659 | Device Matching |
| 660 | -------------------------------------------------------------------------- */ |
| 661 | |
| 662 | /** |
| 663 | * acpi_get_first_physical_node - Get first physical node of an ACPI device |
| 664 | * @adev: ACPI device in question |
| 665 | * |
| 666 | * Return: First physical node of ACPI device @adev |
| 667 | */ |
| 668 | struct device *acpi_get_first_physical_node(struct acpi_device *adev) |
| 669 | { |
| 670 | struct mutex *physical_node_lock = &adev->physical_node_lock; |
| 671 | struct device *phys_dev; |
| 672 | |
| 673 | mutex_lock(physical_node_lock); |
| 674 | if (list_empty(&adev->physical_node_list)) { |
| 675 | phys_dev = NULL; |
| 676 | } else { |
| 677 | const struct acpi_device_physical_node *node; |
| 678 | |
| 679 | node = list_first_entry(&adev->physical_node_list, |
| 680 | struct acpi_device_physical_node, node); |
| 681 | |
| 682 | phys_dev = node->dev; |
| 683 | } |
| 684 | mutex_unlock(physical_node_lock); |
| 685 | return phys_dev; |
| 686 | } |
| 687 | EXPORT_SYMBOL_GPL(acpi_get_first_physical_node); |
| 688 | |
| 689 | static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, |
| 690 | const struct device *dev) |
| 691 | { |
| 692 | const struct device *phys_dev = acpi_get_first_physical_node(adev); |
| 693 | |
| 694 | return phys_dev && phys_dev == dev ? adev : NULL; |
| 695 | } |
| 696 | |
| 697 | /** |
| 698 | * acpi_device_is_first_physical_node - Is given dev first physical node |
| 699 | * @adev: ACPI companion device |
| 700 | * @dev: Physical device to check |
| 701 | * |
| 702 | * Function checks if given @dev is the first physical devices attached to |
| 703 | * the ACPI companion device. This distinction is needed in some cases |
| 704 | * where the same companion device is shared between many physical devices. |
| 705 | * |
| 706 | * Note that the caller have to provide valid @adev pointer. |
| 707 | */ |
| 708 | bool acpi_device_is_first_physical_node(struct acpi_device *adev, |
| 709 | const struct device *dev) |
| 710 | { |
| 711 | return !!acpi_primary_dev_companion(adev, dev); |
| 712 | } |
| 713 | |
| 714 | /* |
| 715 | * acpi_companion_match() - Can we match via ACPI companion device |
| 716 | * @dev: Device in question |
| 717 | * |
| 718 | * Check if the given device has an ACPI companion and if that companion has |
| 719 | * a valid list of PNP IDs, and if the device is the first (primary) physical |
| 720 | * device associated with it. Return the companion pointer if that's the case |
| 721 | * or NULL otherwise. |
| 722 | * |
| 723 | * If multiple physical devices are attached to a single ACPI companion, we need |
| 724 | * to be careful. The usage scenario for this kind of relationship is that all |
| 725 | * of the physical devices in question use resources provided by the ACPI |
| 726 | * companion. A typical case is an MFD device where all the sub-devices share |
| 727 | * the parent's ACPI companion. In such cases we can only allow the primary |
| 728 | * (first) physical device to be matched with the help of the companion's PNP |
| 729 | * IDs. |
| 730 | * |
| 731 | * Additional physical devices sharing the ACPI companion can still use |
| 732 | * resources available from it but they will be matched normally using functions |
| 733 | * provided by their bus types (and analogously for their modalias). |
| 734 | */ |
| 735 | const struct acpi_device *acpi_companion_match(const struct device *dev) |
| 736 | { |
| 737 | struct acpi_device *adev; |
| 738 | |
| 739 | adev = ACPI_COMPANION(dev); |
| 740 | if (!adev) |
| 741 | return NULL; |
| 742 | |
| 743 | if (list_empty(&adev->pnp.ids)) |
| 744 | return NULL; |
| 745 | |
| 746 | return acpi_primary_dev_companion(adev, dev); |
| 747 | } |
| 748 | |
| 749 | /** |
| 750 | * acpi_of_match_device - Match device object using the "compatible" property. |
| 751 | * @adev: ACPI device object to match. |
| 752 | * @of_match_table: List of device IDs to match against. |
| 753 | * @of_id: OF ID if matched |
| 754 | * |
| 755 | * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of |
| 756 | * identifiers and a _DSD object with the "compatible" property, use that |
| 757 | * property to match against the given list of identifiers. |
| 758 | */ |
| 759 | static bool acpi_of_match_device(const struct acpi_device *adev, |
| 760 | const struct of_device_id *of_match_table, |
| 761 | const struct of_device_id **of_id) |
| 762 | { |
| 763 | const union acpi_object *of_compatible, *obj; |
| 764 | int i, nval; |
| 765 | |
| 766 | if (!adev) |
| 767 | return false; |
| 768 | |
| 769 | of_compatible = adev->data.of_compatible; |
| 770 | if (!of_match_table || !of_compatible) |
| 771 | return false; |
| 772 | |
| 773 | if (of_compatible->type == ACPI_TYPE_PACKAGE) { |
| 774 | nval = of_compatible->package.count; |
| 775 | obj = of_compatible->package.elements; |
| 776 | } else { /* Must be ACPI_TYPE_STRING. */ |
| 777 | nval = 1; |
| 778 | obj = of_compatible; |
| 779 | } |
| 780 | /* Now we can look for the driver DT compatible strings */ |
| 781 | for (i = 0; i < nval; i++, obj++) { |
| 782 | const struct of_device_id *id; |
| 783 | |
| 784 | for (id = of_match_table; id->compatible[0]; id++) |
| 785 | if (!strcasecmp(obj->string.pointer, id->compatible)) { |
| 786 | if (of_id) |
| 787 | *of_id = id; |
| 788 | return true; |
| 789 | } |
| 790 | } |
| 791 | |
| 792 | return false; |
| 793 | } |
| 794 | |
| 795 | static bool acpi_of_modalias(struct acpi_device *adev, |
| 796 | char *modalias, size_t len) |
| 797 | { |
| 798 | const union acpi_object *of_compatible; |
| 799 | const union acpi_object *obj; |
| 800 | const char *str, *chr; |
| 801 | |
| 802 | of_compatible = adev->data.of_compatible; |
| 803 | if (!of_compatible) |
| 804 | return false; |
| 805 | |
| 806 | if (of_compatible->type == ACPI_TYPE_PACKAGE) |
| 807 | obj = of_compatible->package.elements; |
| 808 | else /* Must be ACPI_TYPE_STRING. */ |
| 809 | obj = of_compatible; |
| 810 | |
| 811 | str = obj->string.pointer; |
| 812 | chr = strchr(str, ','); |
| 813 | strscpy(modalias, chr ? chr + 1 : str, len); |
| 814 | |
| 815 | return true; |
| 816 | } |
| 817 | |
| 818 | /** |
| 819 | * acpi_set_modalias - Set modalias using "compatible" property or supplied ID |
| 820 | * @adev: ACPI device object to match |
| 821 | * @default_id: ID string to use as default if no compatible string found |
| 822 | * @modalias: Pointer to buffer that modalias value will be copied into |
| 823 | * @len: Length of modalias buffer |
| 824 | * |
| 825 | * This is a counterpart of of_alias_from_compatible() for struct acpi_device |
| 826 | * objects. If there is a compatible string for @adev, it will be copied to |
| 827 | * @modalias with the vendor prefix stripped; otherwise, @default_id will be |
| 828 | * used. |
| 829 | */ |
| 830 | void acpi_set_modalias(struct acpi_device *adev, const char *default_id, |
| 831 | char *modalias, size_t len) |
| 832 | { |
| 833 | if (!acpi_of_modalias(adev, modalias, len)) |
| 834 | strscpy(modalias, default_id, len); |
| 835 | } |
| 836 | EXPORT_SYMBOL_GPL(acpi_set_modalias); |
| 837 | |
| 838 | static bool __acpi_match_device_cls(const struct acpi_device_id *id, |
| 839 | struct acpi_hardware_id *hwid) |
| 840 | { |
| 841 | int i, msk, byte_shift; |
| 842 | char buf[3]; |
| 843 | |
| 844 | if (!id->cls) |
| 845 | return false; |
| 846 | |
| 847 | /* Apply class-code bitmask, before checking each class-code byte */ |
| 848 | for (i = 1; i <= 3; i++) { |
| 849 | byte_shift = 8 * (3 - i); |
| 850 | msk = (id->cls_msk >> byte_shift) & 0xFF; |
| 851 | if (!msk) |
| 852 | continue; |
| 853 | |
| 854 | sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); |
| 855 | if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) |
| 856 | return false; |
| 857 | } |
| 858 | return true; |
| 859 | } |
| 860 | |
| 861 | static bool __acpi_match_device(const struct acpi_device *device, |
| 862 | const struct acpi_device_id *acpi_ids, |
| 863 | const struct of_device_id *of_ids, |
| 864 | const struct acpi_device_id **acpi_id, |
| 865 | const struct of_device_id **of_id) |
| 866 | { |
| 867 | const struct acpi_device_id *id; |
| 868 | struct acpi_hardware_id *hwid; |
| 869 | |
| 870 | /* |
| 871 | * If the device is not present, it is unnecessary to load device |
| 872 | * driver for it. |
| 873 | */ |
| 874 | if (!device || !device->status.present) |
| 875 | return false; |
| 876 | |
| 877 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
| 878 | /* First, check the ACPI/PNP IDs provided by the caller. */ |
| 879 | if (acpi_ids) { |
| 880 | for (id = acpi_ids; id->id[0] || id->cls; id++) { |
| 881 | if (id->id[0] && !strcmp((char *)id->id, hwid->id)) |
| 882 | goto out_acpi_match; |
| 883 | if (id->cls && __acpi_match_device_cls(id, hwid)) |
| 884 | goto out_acpi_match; |
| 885 | } |
| 886 | } |
| 887 | |
| 888 | /* |
| 889 | * Next, check ACPI_DT_NAMESPACE_HID and try to match the |
| 890 | * "compatible" property if found. |
| 891 | */ |
| 892 | if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)) |
| 893 | return acpi_of_match_device(device, of_ids, of_id); |
| 894 | } |
| 895 | return false; |
| 896 | |
| 897 | out_acpi_match: |
| 898 | if (acpi_id) |
| 899 | *acpi_id = id; |
| 900 | return true; |
| 901 | } |
| 902 | |
| 903 | /** |
| 904 | * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs |
| 905 | * @ids: Array of struct acpi_device_id objects to match against. |
| 906 | * @adev: The ACPI device pointer to match. |
| 907 | * |
| 908 | * Match the ACPI device @adev against a given list of ACPI IDs @ids. |
| 909 | * |
| 910 | * Return: |
| 911 | * a pointer to the first matching ACPI ID on success or %NULL on failure. |
| 912 | */ |
| 913 | const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids, |
| 914 | const struct acpi_device *adev) |
| 915 | { |
| 916 | const struct acpi_device_id *id = NULL; |
| 917 | |
| 918 | __acpi_match_device(adev, ids, NULL, &id, NULL); |
| 919 | return id; |
| 920 | } |
| 921 | EXPORT_SYMBOL_GPL(acpi_match_acpi_device); |
| 922 | |
| 923 | /** |
| 924 | * acpi_match_device - Match a struct device against a given list of ACPI IDs |
| 925 | * @ids: Array of struct acpi_device_id object to match against. |
| 926 | * @dev: The device structure to match. |
| 927 | * |
| 928 | * Check if @dev has a valid ACPI handle and if there is a struct acpi_device |
| 929 | * object for that handle and use that object to match against a given list of |
| 930 | * device IDs. |
| 931 | * |
| 932 | * Return a pointer to the first matching ID on success or %NULL on failure. |
| 933 | */ |
| 934 | const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, |
| 935 | const struct device *dev) |
| 936 | { |
| 937 | return acpi_match_acpi_device(ids, acpi_companion_match(dev)); |
| 938 | } |
| 939 | EXPORT_SYMBOL_GPL(acpi_match_device); |
| 940 | |
| 941 | static const void *acpi_of_device_get_match_data(const struct device *dev) |
| 942 | { |
| 943 | struct acpi_device *adev = ACPI_COMPANION(dev); |
| 944 | const struct of_device_id *match = NULL; |
| 945 | |
| 946 | if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match)) |
| 947 | return NULL; |
| 948 | |
| 949 | return match->data; |
| 950 | } |
| 951 | |
| 952 | const void *acpi_device_get_match_data(const struct device *dev) |
| 953 | { |
| 954 | const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table; |
| 955 | const struct acpi_device_id *match; |
| 956 | |
| 957 | if (!acpi_ids) |
| 958 | return acpi_of_device_get_match_data(dev); |
| 959 | |
| 960 | match = acpi_match_device(acpi_ids, dev); |
| 961 | if (!match) |
| 962 | return NULL; |
| 963 | |
| 964 | return (const void *)match->driver_data; |
| 965 | } |
| 966 | EXPORT_SYMBOL_GPL(acpi_device_get_match_data); |
| 967 | |
| 968 | int acpi_match_device_ids(struct acpi_device *device, |
| 969 | const struct acpi_device_id *ids) |
| 970 | { |
| 971 | return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT; |
| 972 | } |
| 973 | EXPORT_SYMBOL(acpi_match_device_ids); |
| 974 | |
| 975 | bool acpi_driver_match_device(struct device *dev, |
| 976 | const struct device_driver *drv) |
| 977 | { |
| 978 | const struct acpi_device_id *acpi_ids = drv->acpi_match_table; |
| 979 | const struct of_device_id *of_ids = drv->of_match_table; |
| 980 | |
| 981 | if (!acpi_ids) |
| 982 | return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL); |
| 983 | |
| 984 | return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL); |
| 985 | } |
| 986 | EXPORT_SYMBOL_GPL(acpi_driver_match_device); |
| 987 | |
| 988 | /* -------------------------------------------------------------------------- |
| 989 | ACPI Driver Management |
| 990 | -------------------------------------------------------------------------- */ |
| 991 | |
| 992 | /** |
| 993 | * acpi_bus_register_driver - register a driver with the ACPI bus |
| 994 | * @driver: driver being registered |
| 995 | * |
| 996 | * Registers a driver with the ACPI bus. Searches the namespace for all |
| 997 | * devices that match the driver's criteria and binds. Returns zero for |
| 998 | * success or a negative error status for failure. |
| 999 | */ |
| 1000 | int acpi_bus_register_driver(struct acpi_driver *driver) |
| 1001 | { |
| 1002 | if (acpi_disabled) |
| 1003 | return -ENODEV; |
| 1004 | driver->drv.name = driver->name; |
| 1005 | driver->drv.bus = &acpi_bus_type; |
| 1006 | driver->drv.owner = driver->owner; |
| 1007 | |
| 1008 | return driver_register(&driver->drv); |
| 1009 | } |
| 1010 | |
| 1011 | EXPORT_SYMBOL(acpi_bus_register_driver); |
| 1012 | |
| 1013 | /** |
| 1014 | * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus |
| 1015 | * @driver: driver to unregister |
| 1016 | * |
| 1017 | * Unregisters a driver with the ACPI bus. Searches the namespace for all |
| 1018 | * devices that match the driver's criteria and unbinds. |
| 1019 | */ |
| 1020 | void acpi_bus_unregister_driver(struct acpi_driver *driver) |
| 1021 | { |
| 1022 | driver_unregister(&driver->drv); |
| 1023 | } |
| 1024 | |
| 1025 | EXPORT_SYMBOL(acpi_bus_unregister_driver); |
| 1026 | |
| 1027 | /* -------------------------------------------------------------------------- |
| 1028 | ACPI Bus operations |
| 1029 | -------------------------------------------------------------------------- */ |
| 1030 | |
| 1031 | static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
| 1032 | { |
| 1033 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
| 1034 | struct acpi_driver *acpi_drv = to_acpi_driver(drv); |
| 1035 | |
| 1036 | return acpi_dev->flags.match_driver |
| 1037 | && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
| 1038 | } |
| 1039 | |
| 1040 | static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env) |
| 1041 | { |
| 1042 | return __acpi_device_uevent_modalias(to_acpi_device(dev), env); |
| 1043 | } |
| 1044 | |
| 1045 | static int acpi_device_probe(struct device *dev) |
| 1046 | { |
| 1047 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
| 1048 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); |
| 1049 | int ret; |
| 1050 | |
| 1051 | if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) |
| 1052 | return -EINVAL; |
| 1053 | |
| 1054 | if (!acpi_drv->ops.add) |
| 1055 | return -ENOSYS; |
| 1056 | |
| 1057 | ret = acpi_drv->ops.add(acpi_dev); |
| 1058 | if (ret) { |
| 1059 | acpi_dev->driver_data = NULL; |
| 1060 | return ret; |
| 1061 | } |
| 1062 | |
| 1063 | pr_debug("Driver [%s] successfully bound to device [%s]\n", |
| 1064 | acpi_drv->name, acpi_dev->pnp.bus_id); |
| 1065 | |
| 1066 | if (acpi_drv->ops.notify) { |
| 1067 | ret = acpi_device_install_notify_handler(acpi_dev, acpi_drv); |
| 1068 | if (ret) { |
| 1069 | if (acpi_drv->ops.remove) |
| 1070 | acpi_drv->ops.remove(acpi_dev); |
| 1071 | |
| 1072 | acpi_dev->driver_data = NULL; |
| 1073 | return ret; |
| 1074 | } |
| 1075 | } |
| 1076 | |
| 1077 | pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name, |
| 1078 | acpi_dev->pnp.bus_id); |
| 1079 | |
| 1080 | get_device(dev); |
| 1081 | return 0; |
| 1082 | } |
| 1083 | |
| 1084 | static void acpi_device_remove(struct device *dev) |
| 1085 | { |
| 1086 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
| 1087 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); |
| 1088 | |
| 1089 | if (acpi_drv->ops.notify) |
| 1090 | acpi_device_remove_notify_handler(acpi_dev, acpi_drv); |
| 1091 | |
| 1092 | if (acpi_drv->ops.remove) |
| 1093 | acpi_drv->ops.remove(acpi_dev); |
| 1094 | |
| 1095 | acpi_dev->driver_data = NULL; |
| 1096 | |
| 1097 | put_device(dev); |
| 1098 | } |
| 1099 | |
| 1100 | struct bus_type acpi_bus_type = { |
| 1101 | .name = "acpi", |
| 1102 | .match = acpi_bus_match, |
| 1103 | .probe = acpi_device_probe, |
| 1104 | .remove = acpi_device_remove, |
| 1105 | .uevent = acpi_device_uevent, |
| 1106 | }; |
| 1107 | |
| 1108 | int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data) |
| 1109 | { |
| 1110 | return bus_for_each_dev(&acpi_bus_type, NULL, data, fn); |
| 1111 | } |
| 1112 | EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev); |
| 1113 | |
| 1114 | struct acpi_dev_walk_context { |
| 1115 | int (*fn)(struct acpi_device *, void *); |
| 1116 | void *data; |
| 1117 | }; |
| 1118 | |
| 1119 | static int acpi_dev_for_one_check(struct device *dev, void *context) |
| 1120 | { |
| 1121 | struct acpi_dev_walk_context *adwc = context; |
| 1122 | |
| 1123 | if (dev->bus != &acpi_bus_type) |
| 1124 | return 0; |
| 1125 | |
| 1126 | return adwc->fn(to_acpi_device(dev), adwc->data); |
| 1127 | } |
| 1128 | EXPORT_SYMBOL_GPL(acpi_dev_for_each_child); |
| 1129 | |
| 1130 | int acpi_dev_for_each_child(struct acpi_device *adev, |
| 1131 | int (*fn)(struct acpi_device *, void *), void *data) |
| 1132 | { |
| 1133 | struct acpi_dev_walk_context adwc = { |
| 1134 | .fn = fn, |
| 1135 | .data = data, |
| 1136 | }; |
| 1137 | |
| 1138 | return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check); |
| 1139 | } |
| 1140 | |
| 1141 | int acpi_dev_for_each_child_reverse(struct acpi_device *adev, |
| 1142 | int (*fn)(struct acpi_device *, void *), |
| 1143 | void *data) |
| 1144 | { |
| 1145 | struct acpi_dev_walk_context adwc = { |
| 1146 | .fn = fn, |
| 1147 | .data = data, |
| 1148 | }; |
| 1149 | |
| 1150 | return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check); |
| 1151 | } |
| 1152 | |
| 1153 | /* -------------------------------------------------------------------------- |
| 1154 | Initialization/Cleanup |
| 1155 | -------------------------------------------------------------------------- */ |
| 1156 | |
| 1157 | static int __init acpi_bus_init_irq(void) |
| 1158 | { |
| 1159 | acpi_status status; |
| 1160 | char *message = NULL; |
| 1161 | |
| 1162 | |
| 1163 | /* |
| 1164 | * Let the system know what interrupt model we are using by |
| 1165 | * evaluating the \_PIC object, if exists. |
| 1166 | */ |
| 1167 | |
| 1168 | switch (acpi_irq_model) { |
| 1169 | case ACPI_IRQ_MODEL_PIC: |
| 1170 | message = "PIC"; |
| 1171 | break; |
| 1172 | case ACPI_IRQ_MODEL_IOAPIC: |
| 1173 | message = "IOAPIC"; |
| 1174 | break; |
| 1175 | case ACPI_IRQ_MODEL_IOSAPIC: |
| 1176 | message = "IOSAPIC"; |
| 1177 | break; |
| 1178 | case ACPI_IRQ_MODEL_GIC: |
| 1179 | message = "GIC"; |
| 1180 | break; |
| 1181 | case ACPI_IRQ_MODEL_PLATFORM: |
| 1182 | message = "platform specific model"; |
| 1183 | break; |
| 1184 | case ACPI_IRQ_MODEL_LPIC: |
| 1185 | message = "LPIC"; |
| 1186 | break; |
| 1187 | default: |
| 1188 | pr_info("Unknown interrupt routing model\n"); |
| 1189 | return -ENODEV; |
| 1190 | } |
| 1191 | |
| 1192 | pr_info("Using %s for interrupt routing\n", message); |
| 1193 | |
| 1194 | status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); |
| 1195 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { |
| 1196 | pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status)); |
| 1197 | return -ENODEV; |
| 1198 | } |
| 1199 | |
| 1200 | return 0; |
| 1201 | } |
| 1202 | |
| 1203 | /** |
| 1204 | * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. |
| 1205 | * |
| 1206 | * The ACPI tables are accessible after this, but the handling of events has not |
| 1207 | * been initialized and the global lock is not available yet, so AML should not |
| 1208 | * be executed at this point. |
| 1209 | * |
| 1210 | * Doing this before switching the EFI runtime services to virtual mode allows |
| 1211 | * the EfiBootServices memory to be freed slightly earlier on boot. |
| 1212 | */ |
| 1213 | void __init acpi_early_init(void) |
| 1214 | { |
| 1215 | acpi_status status; |
| 1216 | |
| 1217 | if (acpi_disabled) |
| 1218 | return; |
| 1219 | |
| 1220 | pr_info("Core revision %08x\n", ACPI_CA_VERSION); |
| 1221 | |
| 1222 | /* enable workarounds, unless strict ACPI spec. compliance */ |
| 1223 | if (!acpi_strict) |
| 1224 | acpi_gbl_enable_interpreter_slack = TRUE; |
| 1225 | |
| 1226 | acpi_permanent_mmap = true; |
| 1227 | |
| 1228 | #ifdef CONFIG_X86 |
| 1229 | /* |
| 1230 | * If the machine falls into the DMI check table, |
| 1231 | * DSDT will be copied to memory. |
| 1232 | * Note that calling dmi_check_system() here on other architectures |
| 1233 | * would not be OK because only x86 initializes dmi early enough. |
| 1234 | * Thankfully only x86 systems need such quirks for now. |
| 1235 | */ |
| 1236 | dmi_check_system(dsdt_dmi_table); |
| 1237 | #endif |
| 1238 | |
| 1239 | status = acpi_reallocate_root_table(); |
| 1240 | if (ACPI_FAILURE(status)) { |
| 1241 | pr_err("Unable to reallocate ACPI tables\n"); |
| 1242 | goto error0; |
| 1243 | } |
| 1244 | |
| 1245 | status = acpi_initialize_subsystem(); |
| 1246 | if (ACPI_FAILURE(status)) { |
| 1247 | pr_err("Unable to initialize the ACPI Interpreter\n"); |
| 1248 | goto error0; |
| 1249 | } |
| 1250 | |
| 1251 | #ifdef CONFIG_X86 |
| 1252 | if (!acpi_ioapic) { |
| 1253 | /* compatible (0) means level (3) */ |
| 1254 | if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { |
| 1255 | acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; |
| 1256 | acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; |
| 1257 | } |
| 1258 | /* Set PIC-mode SCI trigger type */ |
| 1259 | acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, |
| 1260 | (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); |
| 1261 | } else { |
| 1262 | /* |
| 1263 | * now that acpi_gbl_FADT is initialized, |
| 1264 | * update it with result from INT_SRC_OVR parsing |
| 1265 | */ |
| 1266 | acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; |
| 1267 | } |
| 1268 | #endif |
| 1269 | return; |
| 1270 | |
| 1271 | error0: |
| 1272 | disable_acpi(); |
| 1273 | } |
| 1274 | |
| 1275 | /** |
| 1276 | * acpi_subsystem_init - Finalize the early initialization of ACPI. |
| 1277 | * |
| 1278 | * Switch over the platform to the ACPI mode (if possible). |
| 1279 | * |
| 1280 | * Doing this too early is generally unsafe, but at the same time it needs to be |
| 1281 | * done before all things that really depend on ACPI. The right spot appears to |
| 1282 | * be before finalizing the EFI initialization. |
| 1283 | */ |
| 1284 | void __init acpi_subsystem_init(void) |
| 1285 | { |
| 1286 | acpi_status status; |
| 1287 | |
| 1288 | if (acpi_disabled) |
| 1289 | return; |
| 1290 | |
| 1291 | status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); |
| 1292 | if (ACPI_FAILURE(status)) { |
| 1293 | pr_err("Unable to enable ACPI\n"); |
| 1294 | disable_acpi(); |
| 1295 | } else { |
| 1296 | /* |
| 1297 | * If the system is using ACPI then we can be reasonably |
| 1298 | * confident that any regulators are managed by the firmware |
| 1299 | * so tell the regulator core it has everything it needs to |
| 1300 | * know. |
| 1301 | */ |
| 1302 | regulator_has_full_constraints(); |
| 1303 | } |
| 1304 | } |
| 1305 | |
| 1306 | static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) |
| 1307 | { |
| 1308 | if (event == ACPI_TABLE_EVENT_LOAD) |
| 1309 | acpi_scan_table_notify(); |
| 1310 | |
| 1311 | return acpi_sysfs_table_handler(event, table, context); |
| 1312 | } |
| 1313 | |
| 1314 | static int __init acpi_bus_init(void) |
| 1315 | { |
| 1316 | int result; |
| 1317 | acpi_status status; |
| 1318 | |
| 1319 | acpi_os_initialize1(); |
| 1320 | |
| 1321 | status = acpi_load_tables(); |
| 1322 | if (ACPI_FAILURE(status)) { |
| 1323 | pr_err("Unable to load the System Description Tables\n"); |
| 1324 | goto error1; |
| 1325 | } |
| 1326 | |
| 1327 | /* |
| 1328 | * ACPI 2.0 requires the EC driver to be loaded and work before the EC |
| 1329 | * device is found in the namespace. |
| 1330 | * |
| 1331 | * This is accomplished by looking for the ECDT table and getting the EC |
| 1332 | * parameters out of that. |
| 1333 | * |
| 1334 | * Do that before calling acpi_initialize_objects() which may trigger EC |
| 1335 | * address space accesses. |
| 1336 | */ |
| 1337 | acpi_ec_ecdt_probe(); |
| 1338 | |
| 1339 | status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); |
| 1340 | if (ACPI_FAILURE(status)) { |
| 1341 | pr_err("Unable to start the ACPI Interpreter\n"); |
| 1342 | goto error1; |
| 1343 | } |
| 1344 | |
| 1345 | status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); |
| 1346 | if (ACPI_FAILURE(status)) { |
| 1347 | pr_err("Unable to initialize ACPI objects\n"); |
| 1348 | goto error1; |
| 1349 | } |
| 1350 | |
| 1351 | /* |
| 1352 | * _OSC method may exist in module level code, |
| 1353 | * so it must be run after ACPI_FULL_INITIALIZATION |
| 1354 | */ |
| 1355 | acpi_bus_osc_negotiate_platform_control(); |
| 1356 | acpi_bus_osc_negotiate_usb_control(); |
| 1357 | |
| 1358 | /* |
| 1359 | * _PDC control method may load dynamic SSDT tables, |
| 1360 | * and we need to install the table handler before that. |
| 1361 | */ |
| 1362 | status = acpi_install_table_handler(acpi_bus_table_handler, NULL); |
| 1363 | |
| 1364 | acpi_sysfs_init(); |
| 1365 | |
| 1366 | acpi_early_processor_control_setup(); |
| 1367 | |
| 1368 | /* |
| 1369 | * Maybe EC region is required at bus_scan/acpi_get_devices. So it |
| 1370 | * is necessary to enable it as early as possible. |
| 1371 | */ |
| 1372 | acpi_ec_dsdt_probe(); |
| 1373 | |
| 1374 | pr_info("Interpreter enabled\n"); |
| 1375 | |
| 1376 | /* Initialize sleep structures */ |
| 1377 | acpi_sleep_init(); |
| 1378 | |
| 1379 | /* |
| 1380 | * Get the system interrupt model and evaluate \_PIC. |
| 1381 | */ |
| 1382 | result = acpi_bus_init_irq(); |
| 1383 | if (result) |
| 1384 | goto error1; |
| 1385 | |
| 1386 | /* |
| 1387 | * Register the for all standard device notifications. |
| 1388 | */ |
| 1389 | status = |
| 1390 | acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, |
| 1391 | &acpi_bus_notify, NULL); |
| 1392 | if (ACPI_FAILURE(status)) { |
| 1393 | pr_err("Unable to register for system notifications\n"); |
| 1394 | goto error1; |
| 1395 | } |
| 1396 | |
| 1397 | /* |
| 1398 | * Create the top ACPI proc directory |
| 1399 | */ |
| 1400 | acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); |
| 1401 | |
| 1402 | result = bus_register(&acpi_bus_type); |
| 1403 | if (!result) |
| 1404 | return 0; |
| 1405 | |
| 1406 | /* Mimic structured exception handling */ |
| 1407 | error1: |
| 1408 | acpi_terminate(); |
| 1409 | return -ENODEV; |
| 1410 | } |
| 1411 | |
| 1412 | struct kobject *acpi_kobj; |
| 1413 | EXPORT_SYMBOL_GPL(acpi_kobj); |
| 1414 | |
| 1415 | static int __init acpi_init(void) |
| 1416 | { |
| 1417 | int result; |
| 1418 | |
| 1419 | if (acpi_disabled) { |
| 1420 | pr_info("Interpreter disabled.\n"); |
| 1421 | return -ENODEV; |
| 1422 | } |
| 1423 | |
| 1424 | acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); |
| 1425 | if (!acpi_kobj) |
| 1426 | pr_debug("%s: kset create error\n", __func__); |
| 1427 | |
| 1428 | init_prmt(); |
| 1429 | acpi_init_pcc(); |
| 1430 | result = acpi_bus_init(); |
| 1431 | if (result) { |
| 1432 | kobject_put(acpi_kobj); |
| 1433 | disable_acpi(); |
| 1434 | return result; |
| 1435 | } |
| 1436 | acpi_init_ffh(); |
| 1437 | |
| 1438 | pci_mmcfg_late_init(); |
| 1439 | acpi_viot_early_init(); |
| 1440 | acpi_hest_init(); |
| 1441 | acpi_ghes_init(); |
| 1442 | acpi_arm_init(); |
| 1443 | acpi_scan_init(); |
| 1444 | acpi_ec_init(); |
| 1445 | acpi_debugfs_init(); |
| 1446 | acpi_sleep_proc_init(); |
| 1447 | acpi_wakeup_device_init(); |
| 1448 | acpi_debugger_init(); |
| 1449 | acpi_setup_sb_notify_handler(); |
| 1450 | acpi_viot_init(); |
| 1451 | return 0; |
| 1452 | } |
| 1453 | |
| 1454 | subsys_initcall(acpi_init); |