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
 
 
 
  37struct acpi_device *acpi_root;
  38struct proc_dir_entry *acpi_root_dir;
  39EXPORT_SYMBOL(acpi_root_dir);
  40
  41#ifdef CONFIG_X86
  42#ifdef CONFIG_ACPI_CUSTOM_DSDT
  43static inline int set_copy_dsdt(const struct dmi_system_id *id)
  44{
  45	return 0;
  46}
  47#else
  48static 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
  56static 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
  77acpi_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}
  93EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
  94
  95int 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	if (!device->status.present && device->status.enabled) {
 116		pr_info(FW_BUG "Device [%s] status [%08x]: not present and enabled\n",
 117			device->pnp.bus_id, (u32)sta);
 118		device->status.enabled = 0;
 119		/*
 120		 * The status is clearly invalid, so clear the functional bit as
 121		 * well to avoid attempting to use the device.
 122		 */
 123		device->status.functional = 0;
 124	}
 125
 126	acpi_set_device_status(device, sta);
 127
 128	if (device->status.functional && !device->status.present) {
 129		pr_debug("Device [%s] status [%08x]: functional but not present\n",
 130			 device->pnp.bus_id, (u32)sta);
 
 131	}
 132
 133	pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
 
 134	return 0;
 135}
 136EXPORT_SYMBOL(acpi_bus_get_status);
 137
 138void acpi_bus_private_data_handler(acpi_handle handle,
 139				   void *context)
 140{
 141	return;
 142}
 143EXPORT_SYMBOL(acpi_bus_private_data_handler);
 144
 145int acpi_bus_attach_private_data(acpi_handle handle, void *data)
 146{
 147	acpi_status status;
 148
 149	status = acpi_attach_data(handle,
 150			acpi_bus_private_data_handler, data);
 151	if (ACPI_FAILURE(status)) {
 152		acpi_handle_debug(handle, "Error attaching device data\n");
 153		return -ENODEV;
 154	}
 155
 156	return 0;
 157}
 158EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
 159
 160int acpi_bus_get_private_data(acpi_handle handle, void **data)
 161{
 162	acpi_status status;
 163
 164	if (!data)
 165		return -EINVAL;
 166
 167	status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 168	if (ACPI_FAILURE(status)) {
 169		acpi_handle_debug(handle, "No context for object\n");
 
 170		return -ENODEV;
 171	}
 172
 173	return 0;
 174}
 175EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
 176
 177void acpi_bus_detach_private_data(acpi_handle handle)
 178{
 179	acpi_detach_data(handle, acpi_bus_private_data_handler);
 
 
 
 
 180}
 181EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
 182
 183static void acpi_print_osc_error(acpi_handle handle,
 184				 struct acpi_osc_context *context, char *error)
 185{
 
 186	int i;
 187
 188	acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
 189
 190	pr_debug("_OSC request data:");
 
 
 
 
 191	for (i = 0; i < context->cap.length; i += sizeof(u32))
 192		pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
 
 
 
 
 
 
 
 
 193
 194	pr_debug("\n");
 
 
 
 
 
 
 
 
 
 
 
 
 
 195}
 
 196
 197acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 198{
 199	acpi_status status;
 200	struct acpi_object_list input;
 201	union acpi_object in_params[4];
 202	union acpi_object *out_obj;
 203	guid_t guid;
 204	u32 errors;
 205	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 206
 207	if (!context)
 208		return AE_ERROR;
 209	if (guid_parse(context->uuid_str, &guid))
 210		return AE_ERROR;
 211	context->ret.length = ACPI_ALLOCATE_BUFFER;
 212	context->ret.pointer = NULL;
 213
 214	/* Setting up input parameters */
 215	input.count = 4;
 216	input.pointer = in_params;
 217	in_params[0].type 		= ACPI_TYPE_BUFFER;
 218	in_params[0].buffer.length 	= 16;
 219	in_params[0].buffer.pointer	= (u8 *)&guid;
 220	in_params[1].type 		= ACPI_TYPE_INTEGER;
 221	in_params[1].integer.value 	= context->rev;
 222	in_params[2].type 		= ACPI_TYPE_INTEGER;
 223	in_params[2].integer.value	= context->cap.length/sizeof(u32);
 224	in_params[3].type		= ACPI_TYPE_BUFFER;
 225	in_params[3].buffer.length 	= context->cap.length;
 226	in_params[3].buffer.pointer 	= context->cap.pointer;
 227
 228	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 229	if (ACPI_FAILURE(status))
 230		return status;
 231
 232	if (!output.length)
 233		return AE_NULL_OBJECT;
 234
 235	out_obj = output.pointer;
 236	if (out_obj->type != ACPI_TYPE_BUFFER
 237		|| out_obj->buffer.length != context->cap.length) {
 238		acpi_print_osc_error(handle, context,
 239			"_OSC evaluation returned wrong type");
 240		status = AE_TYPE;
 241		goto out_kfree;
 242	}
 243	/* Need to ignore the bit0 in result code */
 244	errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 245	if (errors) {
 246		if (errors & OSC_REQUEST_ERROR)
 247			acpi_print_osc_error(handle, context,
 248				"_OSC request failed");
 249		if (errors & OSC_INVALID_UUID_ERROR)
 250			acpi_print_osc_error(handle, context,
 251				"_OSC invalid UUID");
 252		if (errors & OSC_INVALID_REVISION_ERROR)
 253			acpi_print_osc_error(handle, context,
 254				"_OSC invalid revision");
 255		if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 256			if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 257			    & OSC_QUERY_ENABLE)
 258				goto out_success;
 259			status = AE_SUPPORT;
 260			goto out_kfree;
 261		}
 262		status = AE_ERROR;
 263		goto out_kfree;
 264	}
 265out_success:
 266	context->ret.length = out_obj->buffer.length;
 267	context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 268				       context->ret.length, GFP_KERNEL);
 269	if (!context->ret.pointer) {
 270		status =  AE_NO_MEMORY;
 271		goto out_kfree;
 272	}
 273	status =  AE_OK;
 274
 275out_kfree:
 276	kfree(output.pointer);
 
 
 277	return status;
 278}
 279EXPORT_SYMBOL(acpi_run_osc);
 280
 281bool osc_sb_apei_support_acked;
 282
 283/*
 284 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
 285 * OSPM supports platform coordinated low power idle(LPI) states
 286 */
 287bool osc_pc_lpi_support_confirmed;
 288EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
 289
 290/*
 291 * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':
 292 *   Starting with ACPI Specification 6.2, all _CPC registers can be in
 293 *   PCC, System Memory, System IO, or Functional Fixed Hardware address
 294 *   spaces. OSPM support for this more flexible register space scheme is
 295 *   indicated by the “Flexible Address Space for CPPC Registers” _OSC bit.
 296 *
 297 * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:
 298 * - PCC or Functional Fixed Hardware address space if defined
 299 * - SystemMemory address space (NULL register) if not defined
 300 */
 301bool osc_cpc_flexible_adr_space_confirmed;
 302EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
 303
 304/*
 305 * ACPI 6.4 Operating System Capabilities for USB.
 306 */
 307bool osc_sb_native_usb4_support_confirmed;
 308EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
 309
 310bool osc_sb_cppc2_support_acked;
 311
 312static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 313static void acpi_bus_osc_negotiate_platform_control(void)
 314{
 315	u32 capbuf[2], *capbuf_ret;
 316	struct acpi_osc_context context = {
 317		.uuid_str = sb_uuid_str,
 318		.rev = 1,
 319		.cap.length = 8,
 320		.cap.pointer = capbuf,
 321	};
 322	acpi_handle handle;
 323
 324	capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 325	capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 326	if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
 327		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 328	if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
 329		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 330	if (IS_ENABLED(CONFIG_ACPI_THERMAL))
 331		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FAST_THERMAL_SAMPLING_SUPPORT;
 332	if (IS_ENABLED(CONFIG_ACPI_BATTERY))
 333		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_BATTERY_CHARGE_LIMITING_SUPPORT;
 334
 335	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 336	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
 337	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_OVER_16_PSTATES_SUPPORT;
 338	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GED_SUPPORT;
 339	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_IRQ_RESOURCE_SOURCE_SUPPORT;
 340	if (IS_ENABLED(CONFIG_ACPI_PRMT))
 341		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
 342	if (IS_ENABLED(CONFIG_ACPI_FFH))
 343		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_SUPPORT;
 344
 345#ifdef CONFIG_ARM64
 346	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 347#endif
 348#ifdef CONFIG_X86
 349	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 350#endif
 351
 352#ifdef CONFIG_ACPI_CPPC_LIB
 353	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
 354	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
 355#endif
 356
 357	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
 358
 359	if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
 360		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
 361
 362	if (IS_ENABLED(CONFIG_USB4))
 363		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
 364
 365	if (!ghes_disable)
 366		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 367	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 368		return;
 369
 370	if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 371		return;
 372
 373	capbuf_ret = context.ret.pointer;
 374	if (context.ret.length <= OSC_SUPPORT_DWORD) {
 375		kfree(context.ret.pointer);
 376		return;
 377	}
 378
 379	/*
 380	 * Now run _OSC again with query flag clear and with the caps
 381	 * supported by both the OS and the platform.
 382	 */
 383	capbuf[OSC_QUERY_DWORD] = 0;
 384	capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
 385	kfree(context.ret.pointer);
 386
 387	if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 388		return;
 389
 390	capbuf_ret = context.ret.pointer;
 391	if (context.ret.length > OSC_SUPPORT_DWORD) {
 392#ifdef CONFIG_ACPI_CPPC_LIB
 393		osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT;
 394#endif
 395
 396		osc_sb_apei_support_acked =
 397			capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 398		osc_pc_lpi_support_confirmed =
 399			capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
 400		osc_sb_native_usb4_support_confirmed =
 401			capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
 402		osc_cpc_flexible_adr_space_confirmed =
 403			capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
 404	}
 405
 406	kfree(context.ret.pointer);
 407}
 408
 409/*
 410 * Native control of USB4 capabilities. If any of the tunneling bits is
 411 * set it means OS is in control and we use software based connection
 412 * manager.
 413 */
 414u32 osc_sb_native_usb4_control;
 415EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
 416
 417static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
 418{
 419	pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
 420	       (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
 421	       (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
 422	       (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
 423	       (bits & OSC_USB_XDOMAIN) ? '+' : '-');
 424}
 425
 426static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
 427static void acpi_bus_osc_negotiate_usb_control(void)
 428{
 429	u32 capbuf[3], *capbuf_ret;
 430	struct acpi_osc_context context = {
 431		.uuid_str = sb_usb_uuid_str,
 432		.rev = 1,
 433		.cap.length = sizeof(capbuf),
 434		.cap.pointer = capbuf,
 435	};
 436	acpi_handle handle;
 437	acpi_status status;
 438	u32 control;
 439
 440	if (!osc_sb_native_usb4_support_confirmed)
 441		return;
 442
 443	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 444		return;
 445
 446	control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
 447		  OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
 448
 449	/*
 450	 * Run _OSC first with query bit set, trying to get control over
 451	 * all tunneling. The platform can then clear out bits in the
 452	 * control dword that it does not want to grant to the OS.
 453	 */
 454	capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 455	capbuf[OSC_SUPPORT_DWORD] = 0;
 456	capbuf[OSC_CONTROL_DWORD] = control;
 457
 458	status = acpi_run_osc(handle, &context);
 459	if (ACPI_FAILURE(status))
 460		return;
 461
 462	if (context.ret.length != sizeof(capbuf)) {
 463		pr_info("USB4 _OSC: returned invalid length buffer\n");
 464		goto out_free;
 465	}
 466
 467	/*
 468	 * Run _OSC again now with query bit clear and the control dword
 469	 * matching what the platform granted (which may not have all
 470	 * the control bits set).
 471	 */
 472	capbuf_ret = context.ret.pointer;
 473
 474	capbuf[OSC_QUERY_DWORD] = 0;
 475	capbuf[OSC_CONTROL_DWORD] = capbuf_ret[OSC_CONTROL_DWORD];
 476
 477	kfree(context.ret.pointer);
 478
 479	status = acpi_run_osc(handle, &context);
 480	if (ACPI_FAILURE(status))
 481		return;
 482
 483	if (context.ret.length != sizeof(capbuf)) {
 484		pr_info("USB4 _OSC: returned invalid length buffer\n");
 485		goto out_free;
 486	}
 487
 488	osc_sb_native_usb4_control =
 489		control & acpi_osc_ctx_get_pci_control(&context);
 490
 491	acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
 492	acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
 493				osc_sb_native_usb4_control);
 494
 495out_free:
 496	kfree(context.ret.pointer);
 497}
 498
 499/* --------------------------------------------------------------------------
 500                             Notification Handling
 501   -------------------------------------------------------------------------- */
 502
 503/**
 504 * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler
 505 * @handle: Target ACPI object.
 506 * @type: Notification type.
 507 * @data: Ignored.
 508 *
 509 * This only handles notifications related to device hotplug.
 510 */
 511static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 512{
 513	struct acpi_device *adev;
 
 
 
 514
 515	switch (type) {
 516	case ACPI_NOTIFY_BUS_CHECK:
 517		acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 518		break;
 519
 520	case ACPI_NOTIFY_DEVICE_CHECK:
 521		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 522		break;
 523
 524	case ACPI_NOTIFY_DEVICE_WAKE:
 525		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 526		return;
 527
 528	case ACPI_NOTIFY_EJECT_REQUEST:
 529		acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 530		break;
 531
 532	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 533		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 534		/* TBD: Exactly what does 'light' mean? */
 535		return;
 536
 537	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 538		acpi_handle_err(handle, "Device cannot be configured due "
 539				"to a frequency mismatch\n");
 540		return;
 541
 542	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 543		acpi_handle_err(handle, "Device cannot be configured due "
 544				"to a bus mode mismatch\n");
 545		return;
 546
 547	case ACPI_NOTIFY_POWER_FAULT:
 548		acpi_handle_err(handle, "Device has suffered a power fault\n");
 549		return;
 550
 551	default:
 552		acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 553		return;
 554	}
 555
 556	adev = acpi_get_acpi_dev(handle);
 557
 558	if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 559		return;
 560
 561	acpi_put_acpi_dev(adev);
 562
 563	acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 564}
 565
 566static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
 567{
 568	struct acpi_device *device = data;
 569	struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
 570
 571	acpi_drv->ops.notify(device, event);
 572}
 573
 574static int acpi_device_install_notify_handler(struct acpi_device *device,
 575					      struct acpi_driver *acpi_drv)
 576{
 577	u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
 578				ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
 579	acpi_status status;
 580
 581	status = acpi_install_notify_handler(device->handle, type,
 582					     acpi_notify_device, device);
 583	if (ACPI_FAILURE(status))
 584		return -EINVAL;
 585
 586	return 0;
 587}
 588
 589static void acpi_device_remove_notify_handler(struct acpi_device *device,
 590					      struct acpi_driver *acpi_drv)
 591{
 592	u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
 593				ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
 594
 595	acpi_remove_notify_handler(device->handle, type,
 596				   acpi_notify_device);
 597
 598	acpi_os_wait_events_complete();
 599}
 600
 601int acpi_dev_install_notify_handler(struct acpi_device *adev,
 602				    u32 handler_type,
 603				    acpi_notify_handler handler, void *context)
 604{
 605	acpi_status status;
 606
 607	status = acpi_install_notify_handler(adev->handle, handler_type,
 608					     handler, context);
 609	if (ACPI_FAILURE(status))
 610		return -ENODEV;
 611
 612	return 0;
 613}
 614EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler);
 615
 616void acpi_dev_remove_notify_handler(struct acpi_device *adev,
 617				    u32 handler_type,
 618				    acpi_notify_handler handler)
 619{
 620	acpi_remove_notify_handler(adev->handle, handler_type, handler);
 621	acpi_os_wait_events_complete();
 622}
 623EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler);
 624
 625/* Handle events targeting \_SB device (at present only graceful shutdown) */
 626
 627#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
 628#define ACPI_SB_INDICATE_INTERVAL	10000
 629
 630static void sb_notify_work(struct work_struct *dummy)
 631{
 632	acpi_handle sb_handle;
 633
 634	orderly_poweroff(true);
 635
 636	/*
 637	 * After initiating graceful shutdown, the ACPI spec requires OSPM
 638	 * to evaluate _OST method once every 10seconds to indicate that
 639	 * the shutdown is in progress
 640	 */
 641	acpi_get_handle(NULL, "\\_SB", &sb_handle);
 642	while (1) {
 643		pr_info("Graceful shutdown in progress.\n");
 644		acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
 645				ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
 646		msleep(ACPI_SB_INDICATE_INTERVAL);
 647	}
 648}
 649
 650static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
 651{
 652	static DECLARE_WORK(acpi_sb_work, sb_notify_work);
 653
 654	if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
 655		if (!work_busy(&acpi_sb_work))
 656			schedule_work(&acpi_sb_work);
 657	} else {
 658		pr_warn("event %x is not supported by \\_SB device\n", event);
 659	}
 660}
 661
 662static int __init acpi_setup_sb_notify_handler(void)
 663{
 664	acpi_handle sb_handle;
 665
 666	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
 667		return -ENXIO;
 668
 669	if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
 670						acpi_sb_notify, NULL)))
 671		return -EINVAL;
 672
 673	return 0;
 674}
 675
 676/* --------------------------------------------------------------------------
 677                             Device Matching
 678   -------------------------------------------------------------------------- */
 679
 680/**
 681 * acpi_get_first_physical_node - Get first physical node of an ACPI device
 682 * @adev:	ACPI device in question
 683 *
 684 * Return: First physical node of ACPI device @adev
 685 */
 686struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 687{
 688	struct mutex *physical_node_lock = &adev->physical_node_lock;
 689	struct device *phys_dev;
 690
 691	mutex_lock(physical_node_lock);
 692	if (list_empty(&adev->physical_node_list)) {
 693		phys_dev = NULL;
 694	} else {
 695		const struct acpi_device_physical_node *node;
 696
 697		node = list_first_entry(&adev->physical_node_list,
 698					struct acpi_device_physical_node, node);
 699
 700		phys_dev = node->dev;
 701	}
 702	mutex_unlock(physical_node_lock);
 703	return phys_dev;
 704}
 705EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
 706
 707static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 708						      const struct device *dev)
 709{
 710	const struct device *phys_dev = acpi_get_first_physical_node(adev);
 711
 712	return phys_dev && phys_dev == dev ? adev : NULL;
 713}
 714
 715/**
 716 * acpi_device_is_first_physical_node - Is given dev first physical node
 717 * @adev: ACPI companion device
 718 * @dev: Physical device to check
 719 *
 720 * Function checks if given @dev is the first physical devices attached to
 721 * the ACPI companion device. This distinction is needed in some cases
 722 * where the same companion device is shared between many physical devices.
 723 *
 724 * Note that the caller have to provide valid @adev pointer.
 725 */
 726bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 727					const struct device *dev)
 728{
 729	return !!acpi_primary_dev_companion(adev, dev);
 730}
 731
 732/*
 733 * acpi_companion_match() - Can we match via ACPI companion device
 734 * @dev: Device in question
 735 *
 736 * Check if the given device has an ACPI companion and if that companion has
 737 * a valid list of PNP IDs, and if the device is the first (primary) physical
 738 * device associated with it.  Return the companion pointer if that's the case
 739 * or NULL otherwise.
 740 *
 741 * If multiple physical devices are attached to a single ACPI companion, we need
 742 * to be careful.  The usage scenario for this kind of relationship is that all
 743 * of the physical devices in question use resources provided by the ACPI
 744 * companion.  A typical case is an MFD device where all the sub-devices share
 745 * the parent's ACPI companion.  In such cases we can only allow the primary
 746 * (first) physical device to be matched with the help of the companion's PNP
 747 * IDs.
 748 *
 749 * Additional physical devices sharing the ACPI companion can still use
 750 * resources available from it but they will be matched normally using functions
 751 * provided by their bus types (and analogously for their modalias).
 752 */
 753const struct acpi_device *acpi_companion_match(const struct device *dev)
 754{
 755	struct acpi_device *adev;
 756
 757	adev = ACPI_COMPANION(dev);
 758	if (!adev)
 759		return NULL;
 760
 761	if (list_empty(&adev->pnp.ids))
 762		return NULL;
 763
 764	return acpi_primary_dev_companion(adev, dev);
 765}
 766
 767/**
 768 * acpi_of_match_device - Match device object using the "compatible" property.
 769 * @adev: ACPI device object to match.
 770 * @of_match_table: List of device IDs to match against.
 771 * @of_id: OF ID if matched
 772 *
 773 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 774 * identifiers and a _DSD object with the "compatible" property, use that
 775 * property to match against the given list of identifiers.
 776 */
 777static bool acpi_of_match_device(const struct acpi_device *adev,
 778				 const struct of_device_id *of_match_table,
 779				 const struct of_device_id **of_id)
 780{
 781	const union acpi_object *of_compatible, *obj;
 782	int i, nval;
 783
 784	if (!adev)
 785		return false;
 786
 787	of_compatible = adev->data.of_compatible;
 788	if (!of_match_table || !of_compatible)
 789		return false;
 790
 791	if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 792		nval = of_compatible->package.count;
 793		obj = of_compatible->package.elements;
 794	} else { /* Must be ACPI_TYPE_STRING. */
 795		nval = 1;
 796		obj = of_compatible;
 797	}
 798	/* Now we can look for the driver DT compatible strings */
 799	for (i = 0; i < nval; i++, obj++) {
 800		const struct of_device_id *id;
 801
 802		for (id = of_match_table; id->compatible[0]; id++)
 803			if (!strcasecmp(obj->string.pointer, id->compatible)) {
 804				if (of_id)
 805					*of_id = id;
 806				return true;
 807			}
 808	}
 809
 810	return false;
 811}
 812
 813static bool acpi_of_modalias(struct acpi_device *adev,
 814			     char *modalias, size_t len)
 815{
 816	const union acpi_object *of_compatible;
 817	const union acpi_object *obj;
 818	const char *str, *chr;
 819
 820	of_compatible = adev->data.of_compatible;
 821	if (!of_compatible)
 822		return false;
 823
 824	if (of_compatible->type == ACPI_TYPE_PACKAGE)
 825		obj = of_compatible->package.elements;
 826	else /* Must be ACPI_TYPE_STRING. */
 827		obj = of_compatible;
 828
 829	str = obj->string.pointer;
 830	chr = strchr(str, ',');
 831	strscpy(modalias, chr ? chr + 1 : str, len);
 832
 833	return true;
 834}
 835
 836/**
 837 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 838 * @adev:	ACPI device object to match
 839 * @default_id:	ID string to use as default if no compatible string found
 840 * @modalias:   Pointer to buffer that modalias value will be copied into
 841 * @len:	Length of modalias buffer
 842 *
 843 * This is a counterpart of of_alias_from_compatible() for struct acpi_device
 844 * objects. If there is a compatible string for @adev, it will be copied to
 845 * @modalias with the vendor prefix stripped; otherwise, @default_id will be
 846 * used.
 847 */
 848void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
 849		       char *modalias, size_t len)
 850{
 851	if (!acpi_of_modalias(adev, modalias, len))
 852		strscpy(modalias, default_id, len);
 853}
 854EXPORT_SYMBOL_GPL(acpi_set_modalias);
 855
 856static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 857				    struct acpi_hardware_id *hwid)
 858{
 859	int i, msk, byte_shift;
 860	char buf[3];
 861
 862	if (!id->cls)
 863		return false;
 864
 865	/* Apply class-code bitmask, before checking each class-code byte */
 866	for (i = 1; i <= 3; i++) {
 867		byte_shift = 8 * (3 - i);
 868		msk = (id->cls_msk >> byte_shift) & 0xFF;
 869		if (!msk)
 870			continue;
 871
 872		sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 873		if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 874			return false;
 875	}
 876	return true;
 877}
 878
 879static bool __acpi_match_device(const struct acpi_device *device,
 880				const struct acpi_device_id *acpi_ids,
 881				const struct of_device_id *of_ids,
 882				const struct acpi_device_id **acpi_id,
 883				const struct of_device_id **of_id)
 884{
 885	const struct acpi_device_id *id;
 886	struct acpi_hardware_id *hwid;
 887
 888	/*
 889	 * If the device is not present, it is unnecessary to load device
 890	 * driver for it.
 891	 */
 892	if (!device || !device->status.present)
 893		return false;
 894
 895	list_for_each_entry(hwid, &device->pnp.ids, list) {
 896		/* First, check the ACPI/PNP IDs provided by the caller. */
 897		if (acpi_ids) {
 898			for (id = acpi_ids; id->id[0] || id->cls; id++) {
 899				if (id->id[0] && !strcmp((char *)id->id, hwid->id))
 900					goto out_acpi_match;
 901				if (id->cls && __acpi_match_device_cls(id, hwid))
 902					goto out_acpi_match;
 903			}
 904		}
 905
 906		/*
 907		 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 908		 * "compatible" property if found.
 909		 */
 910		if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
 911			return acpi_of_match_device(device, of_ids, of_id);
 912	}
 913	return false;
 914
 915out_acpi_match:
 916	if (acpi_id)
 917		*acpi_id = id;
 918	return true;
 919}
 920
 921/**
 922 * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs
 923 * @ids: Array of struct acpi_device_id objects to match against.
 924 * @adev: The ACPI device pointer to match.
 925 *
 926 * Match the ACPI device @adev against a given list of ACPI IDs @ids.
 927 *
 928 * Return:
 929 * a pointer to the first matching ACPI ID on success or %NULL on failure.
 930 */
 931const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids,
 932						    const struct acpi_device *adev)
 933{
 934	const struct acpi_device_id *id = NULL;
 935
 936	__acpi_match_device(adev, ids, NULL, &id, NULL);
 937	return id;
 938}
 939EXPORT_SYMBOL_GPL(acpi_match_acpi_device);
 940
 941/**
 942 * acpi_match_device - Match a struct device against a given list of ACPI IDs
 943 * @ids: Array of struct acpi_device_id object to match against.
 944 * @dev: The device structure to match.
 945 *
 946 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 947 * object for that handle and use that object to match against a given list of
 948 * device IDs.
 949 *
 950 * Return a pointer to the first matching ID on success or %NULL on failure.
 951 */
 952const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 953					       const struct device *dev)
 954{
 955	return acpi_match_acpi_device(ids, acpi_companion_match(dev));
 956}
 957EXPORT_SYMBOL_GPL(acpi_match_device);
 958
 959static const void *acpi_of_device_get_match_data(const struct device *dev)
 960{
 961	struct acpi_device *adev = ACPI_COMPANION(dev);
 962	const struct of_device_id *match = NULL;
 963
 964	if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
 965		return NULL;
 966
 967	return match->data;
 968}
 969
 970const void *acpi_device_get_match_data(const struct device *dev)
 971{
 972	const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;
 973	const struct acpi_device_id *match;
 974
 975	if (!acpi_ids)
 976		return acpi_of_device_get_match_data(dev);
 977
 978	match = acpi_match_device(acpi_ids, dev);
 979	if (!match)
 980		return NULL;
 981
 982	return (const void *)match->driver_data;
 983}
 984EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
 985
 986int acpi_match_device_ids(struct acpi_device *device,
 987			  const struct acpi_device_id *ids)
 988{
 989	return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
 990}
 991EXPORT_SYMBOL(acpi_match_device_ids);
 992
 993bool acpi_driver_match_device(struct device *dev,
 994			      const struct device_driver *drv)
 995{
 996	const struct acpi_device_id *acpi_ids = drv->acpi_match_table;
 997	const struct of_device_id *of_ids = drv->of_match_table;
 998
 999	if (!acpi_ids)
1000		return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL);
1001
1002	return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);
1003}
1004EXPORT_SYMBOL_GPL(acpi_driver_match_device);
1005
1006/* --------------------------------------------------------------------------
1007                              ACPI Driver Management
1008   -------------------------------------------------------------------------- */
1009
1010/**
1011 * __acpi_bus_register_driver - register a driver with the ACPI bus
1012 * @driver: driver being registered
1013 * @owner: owning module/driver
1014 *
1015 * Registers a driver with the ACPI bus.  Searches the namespace for all
1016 * devices that match the driver's criteria and binds.  Returns zero for
1017 * success or a negative error status for failure.
1018 */
1019int __acpi_bus_register_driver(struct acpi_driver *driver, struct module *owner)
1020{
1021	if (acpi_disabled)
1022		return -ENODEV;
1023	driver->drv.name = driver->name;
1024	driver->drv.bus = &acpi_bus_type;
1025	driver->drv.owner = owner;
1026
1027	return driver_register(&driver->drv);
1028}
1029
1030EXPORT_SYMBOL(__acpi_bus_register_driver);
1031
1032/**
1033 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1034 * @driver: driver to unregister
1035 *
1036 * Unregisters a driver with the ACPI bus.  Searches the namespace for all
1037 * devices that match the driver's criteria and unbinds.
1038 */
1039void acpi_bus_unregister_driver(struct acpi_driver *driver)
1040{
1041	driver_unregister(&driver->drv);
1042}
1043
1044EXPORT_SYMBOL(acpi_bus_unregister_driver);
1045
1046/* --------------------------------------------------------------------------
1047                              ACPI Bus operations
1048   -------------------------------------------------------------------------- */
1049
1050static int acpi_bus_match(struct device *dev, const struct device_driver *drv)
1051{
1052	struct acpi_device *acpi_dev = to_acpi_device(dev);
1053	const struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1054
1055	return acpi_dev->flags.match_driver
1056		&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1057}
1058
1059static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
1060{
1061	return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1062}
1063
1064static int acpi_device_probe(struct device *dev)
1065{
1066	struct acpi_device *acpi_dev = to_acpi_device(dev);
1067	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1068	int ret;
1069
1070	if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1071		return -EINVAL;
1072
1073	if (!acpi_drv->ops.add)
1074		return -ENOSYS;
1075
1076	ret = acpi_drv->ops.add(acpi_dev);
1077	if (ret) {
1078		acpi_dev->driver_data = NULL;
1079		return ret;
1080	}
1081
1082	pr_debug("Driver [%s] successfully bound to device [%s]\n",
1083		 acpi_drv->name, acpi_dev->pnp.bus_id);
1084
1085	if (acpi_drv->ops.notify) {
1086		ret = acpi_device_install_notify_handler(acpi_dev, acpi_drv);
1087		if (ret) {
1088			if (acpi_drv->ops.remove)
1089				acpi_drv->ops.remove(acpi_dev);
1090
1091			acpi_dev->driver_data = NULL;
1092			return ret;
1093		}
 
 
 
 
 
 
1094	}
 
 
1095
1096	pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1097		 acpi_dev->pnp.bus_id);
1098
1099	get_device(dev);
1100	return 0;
1101}
1102
1103static void acpi_device_remove(struct device *dev)
1104{
1105	struct acpi_device *acpi_dev = to_acpi_device(dev);
1106	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1107
1108	if (acpi_drv->ops.notify)
1109		acpi_device_remove_notify_handler(acpi_dev, acpi_drv);
1110
1111	if (acpi_drv->ops.remove)
1112		acpi_drv->ops.remove(acpi_dev);
1113
1114	acpi_dev->driver_data = NULL;
1115
1116	put_device(dev);
1117}
1118
1119const struct bus_type acpi_bus_type = {
1120	.name		= "acpi",
1121	.match		= acpi_bus_match,
1122	.probe		= acpi_device_probe,
1123	.remove		= acpi_device_remove,
1124	.uevent		= acpi_device_uevent,
1125};
1126
1127int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1128{
1129	return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1130}
1131EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1132
1133struct acpi_dev_walk_context {
1134	int (*fn)(struct acpi_device *, void *);
1135	void *data;
1136};
1137
1138static int acpi_dev_for_one_check(struct device *dev, void *context)
1139{
1140	struct acpi_dev_walk_context *adwc = context;
1141
1142	if (dev->bus != &acpi_bus_type)
1143		return 0;
1144
1145	return adwc->fn(to_acpi_device(dev), adwc->data);
1146}
1147EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
1148
1149int acpi_dev_for_each_child(struct acpi_device *adev,
1150			    int (*fn)(struct acpi_device *, void *), void *data)
1151{
1152	struct acpi_dev_walk_context adwc = {
1153		.fn = fn,
1154		.data = data,
1155	};
1156
1157	return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
1158}
1159
1160int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
1161				    int (*fn)(struct acpi_device *, void *),
1162				    void *data)
1163{
1164	struct acpi_dev_walk_context adwc = {
1165		.fn = fn,
1166		.data = data,
1167	};
1168
1169	return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
1170}
1171
1172/* --------------------------------------------------------------------------
1173                             Initialization/Cleanup
1174   -------------------------------------------------------------------------- */
1175
1176static int __init acpi_bus_init_irq(void)
1177{
1178	acpi_status status;
1179	char *message = NULL;
1180
1181
1182	/*
1183	 * Let the system know what interrupt model we are using by
1184	 * evaluating the \_PIC object, if exists.
1185	 */
1186
1187	switch (acpi_irq_model) {
1188	case ACPI_IRQ_MODEL_PIC:
1189		message = "PIC";
1190		break;
1191	case ACPI_IRQ_MODEL_IOAPIC:
1192		message = "IOAPIC";
1193		break;
1194	case ACPI_IRQ_MODEL_IOSAPIC:
1195		message = "IOSAPIC";
1196		break;
1197	case ACPI_IRQ_MODEL_GIC:
1198		message = "GIC";
1199		break;
1200	case ACPI_IRQ_MODEL_PLATFORM:
1201		message = "platform specific model";
1202		break;
1203	case ACPI_IRQ_MODEL_LPIC:
1204		message = "LPIC";
1205		break;
1206	case ACPI_IRQ_MODEL_RINTC:
1207		message = "RINTC";
1208		break;
1209	default:
1210		pr_info("Unknown interrupt routing model\n");
1211		return -ENODEV;
1212	}
1213
1214	pr_info("Using %s for interrupt routing\n", message);
1215
1216	status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1217	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1218		pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1219		return -ENODEV;
1220	}
1221
1222	return 0;
1223}
1224
1225/**
1226 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1227 *
1228 * The ACPI tables are accessible after this, but the handling of events has not
1229 * been initialized and the global lock is not available yet, so AML should not
1230 * be executed at this point.
1231 *
1232 * Doing this before switching the EFI runtime services to virtual mode allows
1233 * the EfiBootServices memory to be freed slightly earlier on boot.
1234 */
1235void __init acpi_early_init(void)
1236{
1237	acpi_status status;
1238
1239	if (acpi_disabled)
1240		return;
1241
1242	pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1243
1244	/* enable workarounds, unless strict ACPI spec. compliance */
1245	if (!acpi_strict)
1246		acpi_gbl_enable_interpreter_slack = TRUE;
1247
1248	acpi_permanent_mmap = true;
1249
1250#ifdef CONFIG_X86
1251	/*
1252	 * If the machine falls into the DMI check table,
1253	 * DSDT will be copied to memory.
1254	 * Note that calling dmi_check_system() here on other architectures
1255	 * would not be OK because only x86 initializes dmi early enough.
1256	 * Thankfully only x86 systems need such quirks for now.
1257	 */
1258	dmi_check_system(dsdt_dmi_table);
1259#endif
1260
1261	status = acpi_reallocate_root_table();
1262	if (ACPI_FAILURE(status)) {
1263		pr_err("Unable to reallocate ACPI tables\n");
 
1264		goto error0;
1265	}
1266
1267	status = acpi_initialize_subsystem();
1268	if (ACPI_FAILURE(status)) {
1269		pr_err("Unable to initialize the ACPI Interpreter\n");
 
 
 
 
 
 
 
 
1270		goto error0;
1271	}
1272
1273#ifdef CONFIG_X86
1274	if (!acpi_ioapic) {
1275		/* compatible (0) means level (3) */
1276		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1277			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1278			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1279		}
1280		/* Set PIC-mode SCI trigger type */
1281		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1282					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1283	} else {
1284		/*
1285		 * now that acpi_gbl_FADT is initialized,
1286		 * update it with result from INT_SRC_OVR parsing
1287		 */
1288		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1289	}
1290#endif
1291	return;
1292
1293 error0:
1294	disable_acpi();
1295}
1296
1297/**
1298 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1299 *
1300 * Switch over the platform to the ACPI mode (if possible).
1301 *
1302 * Doing this too early is generally unsafe, but at the same time it needs to be
1303 * done before all things that really depend on ACPI.  The right spot appears to
1304 * be before finalizing the EFI initialization.
1305 */
1306void __init acpi_subsystem_init(void)
1307{
1308	acpi_status status;
1309
1310	if (acpi_disabled)
1311		return;
1312
1313	status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1314	if (ACPI_FAILURE(status)) {
1315		pr_err("Unable to enable ACPI\n");
1316		disable_acpi();
1317	} else {
1318		/*
1319		 * If the system is using ACPI then we can be reasonably
1320		 * confident that any regulators are managed by the firmware
1321		 * so tell the regulator core it has everything it needs to
1322		 * know.
1323		 */
1324		regulator_has_full_constraints();
1325	}
1326}
1327
1328static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1329{
1330	if (event == ACPI_TABLE_EVENT_LOAD)
1331		acpi_scan_table_notify();
 
 
 
1332
1333	return acpi_sysfs_table_handler(event, table, context);
 
 
 
 
1334}
1335
1336static int __init acpi_bus_init(void)
1337{
1338	int result;
1339	acpi_status status;
1340
1341	acpi_os_initialize1();
1342
1343	status = acpi_load_tables();
1344	if (ACPI_FAILURE(status)) {
1345		pr_err("Unable to load the System Description Tables\n");
 
1346		goto error1;
1347	}
1348
1349	/*
1350	 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1351	 * device is found in the namespace.
1352	 *
1353	 * This is accomplished by looking for the ECDT table and getting the EC
1354	 * parameters out of that.
1355	 *
1356	 * Do that before calling acpi_initialize_objects() which may trigger EC
1357	 * address space accesses.
1358	 */
1359	acpi_ec_ecdt_probe();
1360
1361	status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1362	if (ACPI_FAILURE(status)) {
1363		pr_err("Unable to start the ACPI Interpreter\n");
1364		goto error1;
1365	}
1366
1367	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1368	if (ACPI_FAILURE(status)) {
1369		pr_err("Unable to initialize ACPI objects\n");
1370		goto error1;
1371	}
1372
1373	/*
1374	 * _OSC method may exist in module level code,
1375	 * so it must be run after ACPI_FULL_INITIALIZATION
1376	 */
1377	acpi_bus_osc_negotiate_platform_control();
1378	acpi_bus_osc_negotiate_usb_control();
1379
1380	/*
1381	 * _PDC control method may load dynamic SSDT tables,
1382	 * and we need to install the table handler before that.
1383	 */
1384	status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1385
1386	acpi_sysfs_init();
1387
1388	acpi_early_processor_control_setup();
1389
1390	/*
1391	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1392	 * is necessary to enable it as early as possible.
1393	 */
1394	acpi_ec_dsdt_probe();
1395
1396	pr_info("Interpreter enabled\n");
1397
1398	/* Initialize sleep structures */
1399	acpi_sleep_init();
1400
1401	/*
1402	 * Get the system interrupt model and evaluate \_PIC.
1403	 */
1404	result = acpi_bus_init_irq();
1405	if (result)
1406		goto error1;
1407
1408	/*
1409	 * Register the for all standard device notifications.
1410	 */
1411	status =
1412	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1413					&acpi_bus_notify, NULL);
1414	if (ACPI_FAILURE(status)) {
1415		pr_err("Unable to register for system notifications\n");
 
1416		goto error1;
1417	}
1418
1419	/*
1420	 * Create the top ACPI proc directory
1421	 */
1422	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1423
1424	result = bus_register(&acpi_bus_type);
1425	if (!result)
1426		return 0;
1427
1428	/* Mimic structured exception handling */
1429      error1:
1430	acpi_terminate();
1431	return -ENODEV;
1432}
1433
1434struct kobject *acpi_kobj;
1435EXPORT_SYMBOL_GPL(acpi_kobj);
1436
1437void __weak __init acpi_arch_init(void) { }
1438
1439static int __init acpi_init(void)
1440{
1441	int result;
1442
1443	if (acpi_disabled) {
1444		pr_info("Interpreter disabled.\n");
1445		return -ENODEV;
1446	}
1447
1448	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1449	if (!acpi_kobj)
1450		pr_debug("%s: kset create error\n", __func__);
 
 
1451
1452	init_prmt();
1453	acpi_init_pcc();
1454	result = acpi_bus_init();
1455	if (result) {
1456		kobject_put(acpi_kobj);
1457		disable_acpi();
1458		return result;
1459	}
1460	acpi_init_ffh();
1461
1462	pci_mmcfg_late_init();
1463	acpi_viot_early_init();
1464	acpi_hest_init();
1465	acpi_ghes_init();
1466	acpi_arch_init();
1467	acpi_scan_init();
1468	acpi_ec_init();
1469	acpi_debugfs_init();
1470	acpi_sleep_proc_init();
1471	acpi_wakeup_device_init();
1472	acpi_debugger_init();
1473	acpi_setup_sb_notify_handler();
1474	acpi_viot_init();
1475	return 0;
1476}
1477
1478subsys_initcall(acpi_init);