bus.c 29.7 KB
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/*
 *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
 *
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/device.h>
#include <linux/proc_fs.h>
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#include <linux/acpi.h>
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#include <linux/slab.h>
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#include <linux/regulator/machine.h>
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#ifdef CONFIG_X86
#include <asm/mpspec.h>
#endif
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#include <linux/pci.h>
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#include <acpi/apei.h>
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#include <linux/dmi.h>
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#include <linux/suspend.h>
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#include "internal.h"

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#define _COMPONENT		ACPI_BUS_COMPONENT
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ACPI_MODULE_NAME("bus");
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struct acpi_device *acpi_root;
struct proc_dir_entry *acpi_root_dir;
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EXPORT_SYMBOL(acpi_root_dir);

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#ifdef CONFIG_X86
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#ifdef CONFIG_ACPI_CUSTOM_DSDT
static inline int set_copy_dsdt(const struct dmi_system_id *id)
{
	return 0;
}
#else
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static int set_copy_dsdt(const struct dmi_system_id *id)
{
	printk(KERN_NOTICE "%s detected - "
		"force copy of DSDT to local memory\n", id->ident);
	acpi_gbl_copy_dsdt_locally = 1;
	return 0;
}
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#endif
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static struct dmi_system_id dsdt_dmi_table[] __initdata = {
	/*
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	 * Invoke DSDT corruption work-around on all Toshiba Satellite.
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	 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
	 */
	{
	 .callback = set_copy_dsdt,
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	 .ident = "TOSHIBA Satellite",
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	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
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		DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
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		},
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	},
	{}
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};
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#else
static struct dmi_system_id dsdt_dmi_table[] __initdata = {
	{}
};
#endif
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/* --------------------------------------------------------------------------
                                Device Management
   -------------------------------------------------------------------------- */

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acpi_status acpi_bus_get_status_handle(acpi_handle handle,
				       unsigned long long *sta)
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{
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	acpi_status status;
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	status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
	if (ACPI_SUCCESS(status))
		return AE_OK;
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	if (status == AE_NOT_FOUND) {
		*sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
		       ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
		return AE_OK;
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	}
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	return status;
}
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int acpi_bus_get_status(struct acpi_device *device)
{
	acpi_status status;
	unsigned long long sta;

	status = acpi_bus_get_status_handle(device->handle, &sta);
	if (ACPI_FAILURE(status))
		return -ENODEV;

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	acpi_set_device_status(device, sta);
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	if (device->status.functional && !device->status.present) {
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		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
		       "functional but not present;\n",
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			device->pnp.bus_id, (u32)sta));
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	}

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	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
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			  device->pnp.bus_id, (u32)sta));
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	return 0;
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}
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EXPORT_SYMBOL(acpi_bus_get_status);
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void acpi_bus_private_data_handler(acpi_handle handle,
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				   void *context)
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{
	return;
}
EXPORT_SYMBOL(acpi_bus_private_data_handler);

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int acpi_bus_attach_private_data(acpi_handle handle, void *data)
{
	acpi_status status;

	status = acpi_attach_data(handle,
			acpi_bus_private_data_handler, data);
	if (ACPI_FAILURE(status)) {
		acpi_handle_debug(handle, "Error attaching device data\n");
		return -ENODEV;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);

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int acpi_bus_get_private_data(acpi_handle handle, void **data)
{
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	acpi_status status;
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	if (!*data)
		return -EINVAL;

	status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
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	if (ACPI_FAILURE(status)) {
		acpi_handle_debug(handle, "No context for object\n");
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		return -ENODEV;
	}

	return 0;
}
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EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);

void acpi_bus_detach_private_data(acpi_handle handle)
{
	acpi_detach_data(handle, acpi_bus_private_data_handler);
}
EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
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static void acpi_print_osc_error(acpi_handle handle,
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				 struct acpi_osc_context *context, char *error)
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{
	int i;

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	acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);

	pr_debug("_OSC request data:");
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	for (i = 0; i < context->cap.length; i += sizeof(u32))
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		pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));

	pr_debug("\n");
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}

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acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
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{
	int i;
	static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
		24, 26, 28, 30, 32, 34};

	if (strlen(str) != 36)
		return AE_BAD_PARAMETER;
	for (i = 0; i < 36; i++) {
		if (i == 8 || i == 13 || i == 18 || i == 23) {
			if (str[i] != '-')
				return AE_BAD_PARAMETER;
		} else if (!isxdigit(str[i]))
			return AE_BAD_PARAMETER;
	}
	for (i = 0; i < 16; i++) {
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		uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
		uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
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	}
	return AE_OK;
}
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EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
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acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
{
	acpi_status status;
	struct acpi_object_list input;
	union acpi_object in_params[4];
	union acpi_object *out_obj;
	u8 uuid[16];
	u32 errors;
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	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
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	if (!context)
		return AE_ERROR;
	if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
		return AE_ERROR;
	context->ret.length = ACPI_ALLOCATE_BUFFER;
	context->ret.pointer = NULL;

	/* Setting up input parameters */
	input.count = 4;
	input.pointer = in_params;
	in_params[0].type 		= ACPI_TYPE_BUFFER;
	in_params[0].buffer.length 	= 16;
	in_params[0].buffer.pointer	= uuid;
	in_params[1].type 		= ACPI_TYPE_INTEGER;
	in_params[1].integer.value 	= context->rev;
	in_params[2].type 		= ACPI_TYPE_INTEGER;
	in_params[2].integer.value	= context->cap.length/sizeof(u32);
	in_params[3].type		= ACPI_TYPE_BUFFER;
	in_params[3].buffer.length 	= context->cap.length;
	in_params[3].buffer.pointer 	= context->cap.pointer;

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	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
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	if (ACPI_FAILURE(status))
		return status;

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	if (!output.length)
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		return AE_NULL_OBJECT;

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	out_obj = output.pointer;
	if (out_obj->type != ACPI_TYPE_BUFFER
		|| out_obj->buffer.length != context->cap.length) {
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		acpi_print_osc_error(handle, context,
			"_OSC evaluation returned wrong type");
		status = AE_TYPE;
		goto out_kfree;
	}
	/* Need to ignore the bit0 in result code */
	errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
	if (errors) {
		if (errors & OSC_REQUEST_ERROR)
			acpi_print_osc_error(handle, context,
				"_OSC request failed");
		if (errors & OSC_INVALID_UUID_ERROR)
			acpi_print_osc_error(handle, context,
				"_OSC invalid UUID");
		if (errors & OSC_INVALID_REVISION_ERROR)
			acpi_print_osc_error(handle, context,
				"_OSC invalid revision");
		if (errors & OSC_CAPABILITIES_MASK_ERROR) {
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			if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
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			    & OSC_QUERY_ENABLE)
				goto out_success;
			status = AE_SUPPORT;
			goto out_kfree;
		}
		status = AE_ERROR;
		goto out_kfree;
	}
out_success:
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	context->ret.length = out_obj->buffer.length;
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	context->ret.pointer = kmemdup(out_obj->buffer.pointer,
				       context->ret.length, GFP_KERNEL);
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	if (!context->ret.pointer) {
		status =  AE_NO_MEMORY;
		goto out_kfree;
	}
	status =  AE_OK;
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out_kfree:
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	kfree(output.pointer);
	if (status != AE_OK)
		context->ret.pointer = NULL;
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	return status;
}
EXPORT_SYMBOL(acpi_run_osc);

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bool osc_sb_apei_support_acked;
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static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
static void acpi_bus_osc_support(void)
{
	u32 capbuf[2];
	struct acpi_osc_context context = {
		.uuid_str = sb_uuid_str,
		.rev = 1,
		.cap.length = 8,
		.cap.pointer = capbuf,
	};
	acpi_handle handle;

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	capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
	capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
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	if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
	if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
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	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
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	if (!ghes_disable)
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		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
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	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
		return;
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	if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
		u32 *capbuf_ret = context.ret.pointer;
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		if (context.ret.length > OSC_SUPPORT_DWORD)
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			osc_sb_apei_support_acked =
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				capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
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		kfree(context.ret.pointer);
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	}
	/* do we need to check other returned cap? Sounds no */
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}

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/* --------------------------------------------------------------------------
                             Notification Handling
   -------------------------------------------------------------------------- */

/**
 * acpi_bus_notify
 * ---------------
 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 */
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static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
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{
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	struct acpi_device *adev;
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	struct acpi_driver *driver;
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	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
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	bool hotplug_event = false;
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	switch (type) {
	case ACPI_NOTIFY_BUS_CHECK:
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		acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
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		hotplug_event = true;
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		break;

	case ACPI_NOTIFY_DEVICE_CHECK:
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		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
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		hotplug_event = true;
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		break;

	case ACPI_NOTIFY_DEVICE_WAKE:
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		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
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		break;

	case ACPI_NOTIFY_EJECT_REQUEST:
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		acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
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		hotplug_event = true;
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		break;

	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
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		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
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		/* TBD: Exactly what does 'light' mean? */
		break;

	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
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		acpi_handle_err(handle, "Device cannot be configured due "
				"to a frequency mismatch\n");
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		break;

	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
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		acpi_handle_err(handle, "Device cannot be configured due "
				"to a bus mode mismatch\n");
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		break;

	case ACPI_NOTIFY_POWER_FAULT:
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		acpi_handle_err(handle, "Device has suffered a power fault\n");
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		break;

	default:
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		acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
		break;
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	}

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	adev = acpi_bus_get_acpi_device(handle);
	if (!adev)
		goto err;
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	driver = adev->driver;
	if (driver && driver->ops.notify &&
	    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
		driver->ops.notify(adev, type);

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	if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
		return;

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	acpi_bus_put_acpi_device(adev);
	return;

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	acpi_evaluate_ost(handle, type, ost_code, NULL);
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}

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static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
{
	struct acpi_device *device = data;

	device->driver->ops.notify(device, event);
}

static void acpi_device_notify_fixed(void *data)
{
	struct acpi_device *device = data;

	/* Fixed hardware devices have no handles */
	acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
}

static u32 acpi_device_fixed_event(void *data)
{
	acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
	return ACPI_INTERRUPT_HANDLED;
}

static int acpi_device_install_notify_handler(struct acpi_device *device)
{
	acpi_status status;

	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						     acpi_device_fixed_event,
						     device);
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
						     acpi_device_fixed_event,
						     device);
	else
		status = acpi_install_notify_handler(device->handle,
						     ACPI_DEVICE_NOTIFY,
						     acpi_device_notify,
						     device);

	if (ACPI_FAILURE(status))
		return -EINVAL;
	return 0;
}

static void acpi_device_remove_notify_handler(struct acpi_device *device)
{
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
		acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						acpi_device_fixed_event);
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
		acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
						acpi_device_fixed_event);
	else
		acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
					   acpi_device_notify);
}

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/* --------------------------------------------------------------------------
                             Device Matching
   -------------------------------------------------------------------------- */

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/**
 * acpi_get_first_physical_node - Get first physical node of an ACPI device
 * @adev:	ACPI device in question
 *
 * Return: First physical node of ACPI device @adev
 */
struct device *acpi_get_first_physical_node(struct acpi_device *adev)
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{
	struct mutex *physical_node_lock = &adev->physical_node_lock;
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	struct device *phys_dev;
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	mutex_lock(physical_node_lock);
	if (list_empty(&adev->physical_node_list)) {
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		phys_dev = NULL;
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	} else {
		const struct acpi_device_physical_node *node;

		node = list_first_entry(&adev->physical_node_list,
					struct acpi_device_physical_node, node);
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		phys_dev = node->dev;
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	}
	mutex_unlock(physical_node_lock);
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	return phys_dev;
}

static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
						      const struct device *dev)
{
	const struct device *phys_dev = acpi_get_first_physical_node(adev);

	return phys_dev && phys_dev == dev ? adev : NULL;
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}

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/**
 * acpi_device_is_first_physical_node - Is given dev first physical node
 * @adev: ACPI companion device
 * @dev: Physical device to check
 *
 * Function checks if given @dev is the first physical devices attached to
 * the ACPI companion device. This distinction is needed in some cases
 * where the same companion device is shared between many physical devices.
 *
 * Note that the caller have to provide valid @adev pointer.
 */
bool acpi_device_is_first_physical_node(struct acpi_device *adev,
					const struct device *dev)
{
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	return !!acpi_primary_dev_companion(adev, dev);
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}

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/*
 * acpi_companion_match() - Can we match via ACPI companion device
 * @dev: Device in question
 *
 * Check if the given device has an ACPI companion and if that companion has
 * a valid list of PNP IDs, and if the device is the first (primary) physical
 * device associated with it.  Return the companion pointer if that's the case
 * or NULL otherwise.
 *
 * If multiple physical devices are attached to a single ACPI companion, we need
 * to be careful.  The usage scenario for this kind of relationship is that all
 * of the physical devices in question use resources provided by the ACPI
 * companion.  A typical case is an MFD device where all the sub-devices share
 * the parent's ACPI companion.  In such cases we can only allow the primary
 * (first) physical device to be matched with the help of the companion's PNP
 * IDs.
 *
 * Additional physical devices sharing the ACPI companion can still use
 * resources available from it but they will be matched normally using functions
 * provided by their bus types (and analogously for their modalias).
 */
struct acpi_device *acpi_companion_match(const struct device *dev)
{
	struct acpi_device *adev;

	adev = ACPI_COMPANION(dev);
	if (!adev)
		return NULL;

	if (list_empty(&adev->pnp.ids))
		return NULL;

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	return acpi_primary_dev_companion(adev, dev);
561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702
}

/**
 * acpi_of_match_device - Match device object using the "compatible" property.
 * @adev: ACPI device object to match.
 * @of_match_table: List of device IDs to match against.
 *
 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 * identifiers and a _DSD object with the "compatible" property, use that
 * property to match against the given list of identifiers.
 */
static bool acpi_of_match_device(struct acpi_device *adev,
				 const struct of_device_id *of_match_table)
{
	const union acpi_object *of_compatible, *obj;
	int i, nval;

	if (!adev)
		return false;

	of_compatible = adev->data.of_compatible;
	if (!of_match_table || !of_compatible)
		return false;

	if (of_compatible->type == ACPI_TYPE_PACKAGE) {
		nval = of_compatible->package.count;
		obj = of_compatible->package.elements;
	} else { /* Must be ACPI_TYPE_STRING. */
		nval = 1;
		obj = of_compatible;
	}
	/* Now we can look for the driver DT compatible strings */
	for (i = 0; i < nval; i++, obj++) {
		const struct of_device_id *id;

		for (id = of_match_table; id->compatible[0]; id++)
			if (!strcasecmp(obj->string.pointer, id->compatible))
				return true;
	}

	return false;
}

static bool __acpi_match_device_cls(const struct acpi_device_id *id,
				    struct acpi_hardware_id *hwid)
{
	int i, msk, byte_shift;
	char buf[3];

	if (!id->cls)
		return false;

	/* Apply class-code bitmask, before checking each class-code byte */
	for (i = 1; i <= 3; i++) {
		byte_shift = 8 * (3 - i);
		msk = (id->cls_msk >> byte_shift) & 0xFF;
		if (!msk)
			continue;

		sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
		if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
			return false;
	}
	return true;
}

static const struct acpi_device_id *__acpi_match_device(
	struct acpi_device *device,
	const struct acpi_device_id *ids,
	const struct of_device_id *of_ids)
{
	const struct acpi_device_id *id;
	struct acpi_hardware_id *hwid;

	/*
	 * If the device is not present, it is unnecessary to load device
	 * driver for it.
	 */
	if (!device || !device->status.present)
		return NULL;

	list_for_each_entry(hwid, &device->pnp.ids, list) {
		/* First, check the ACPI/PNP IDs provided by the caller. */
		for (id = ids; id->id[0] || id->cls; id++) {
			if (id->id[0] && !strcmp((char *) id->id, hwid->id))
				return id;
			else if (id->cls && __acpi_match_device_cls(id, hwid))
				return id;
		}

		/*
		 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
		 * "compatible" property if found.
		 *
		 * The id returned by the below is not valid, but the only
		 * caller passing non-NULL of_ids here is only interested in
		 * whether or not the return value is NULL.
		 */
		if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
		    && acpi_of_match_device(device, of_ids))
			return id;
	}
	return NULL;
}

/**
 * acpi_match_device - Match a struct device against a given list of ACPI IDs
 * @ids: Array of struct acpi_device_id object to match against.
 * @dev: The device structure to match.
 *
 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 * object for that handle and use that object to match against a given list of
 * device IDs.
 *
 * Return a pointer to the first matching ID on success or %NULL on failure.
 */
const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
					       const struct device *dev)
{
	return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
}
EXPORT_SYMBOL_GPL(acpi_match_device);

int acpi_match_device_ids(struct acpi_device *device,
			  const struct acpi_device_id *ids)
{
	return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
}
EXPORT_SYMBOL(acpi_match_device_ids);

bool acpi_driver_match_device(struct device *dev,
			      const struct device_driver *drv)
{
	if (!drv->acpi_match_table)
		return acpi_of_match_device(ACPI_COMPANION(dev),
					    drv->of_match_table);

	return !!__acpi_match_device(acpi_companion_match(dev),
				     drv->acpi_match_table, drv->of_match_table);
}
EXPORT_SYMBOL_GPL(acpi_driver_match_device);

703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827
/* --------------------------------------------------------------------------
                              ACPI Driver Management
   -------------------------------------------------------------------------- */

/**
 * acpi_bus_register_driver - register a driver with the ACPI bus
 * @driver: driver being registered
 *
 * Registers a driver with the ACPI bus.  Searches the namespace for all
 * devices that match the driver's criteria and binds.  Returns zero for
 * success or a negative error status for failure.
 */
int acpi_bus_register_driver(struct acpi_driver *driver)
{
	int ret;

	if (acpi_disabled)
		return -ENODEV;
	driver->drv.name = driver->name;
	driver->drv.bus = &acpi_bus_type;
	driver->drv.owner = driver->owner;

	ret = driver_register(&driver->drv);
	return ret;
}

EXPORT_SYMBOL(acpi_bus_register_driver);

/**
 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 * @driver: driver to unregister
 *
 * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 * devices that match the driver's criteria and unbinds.
 */
void acpi_bus_unregister_driver(struct acpi_driver *driver)
{
	driver_unregister(&driver->drv);
}

EXPORT_SYMBOL(acpi_bus_unregister_driver);

/* --------------------------------------------------------------------------
                              ACPI Bus operations
   -------------------------------------------------------------------------- */

static int acpi_bus_match(struct device *dev, struct device_driver *drv)
{
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(drv);

	return acpi_dev->flags.match_driver
		&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
}

static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
}

static int acpi_device_probe(struct device *dev)
{
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
	int ret;

	if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
		return -EINVAL;

	if (!acpi_drv->ops.add)
		return -ENOSYS;

	ret = acpi_drv->ops.add(acpi_dev);
	if (ret)
		return ret;

	acpi_dev->driver = acpi_drv;
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Driver [%s] successfully bound to device [%s]\n",
			  acpi_drv->name, acpi_dev->pnp.bus_id));

	if (acpi_drv->ops.notify) {
		ret = acpi_device_install_notify_handler(acpi_dev);
		if (ret) {
			if (acpi_drv->ops.remove)
				acpi_drv->ops.remove(acpi_dev);

			acpi_dev->driver = NULL;
			acpi_dev->driver_data = NULL;
			return ret;
		}
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
			  acpi_drv->name, acpi_dev->pnp.bus_id));
	get_device(dev);
	return 0;
}

static int acpi_device_remove(struct device * dev)
{
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = acpi_dev->driver;

	if (acpi_drv) {
		if (acpi_drv->ops.notify)
			acpi_device_remove_notify_handler(acpi_dev);
		if (acpi_drv->ops.remove)
			acpi_drv->ops.remove(acpi_dev);
	}
	acpi_dev->driver = NULL;
	acpi_dev->driver_data = NULL;

	put_device(dev);
	return 0;
}

struct bus_type acpi_bus_type = {
	.name		= "acpi",
	.match		= acpi_bus_match,
	.probe		= acpi_device_probe,
	.remove		= acpi_device_remove,
	.uevent		= acpi_device_uevent,
};

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/* --------------------------------------------------------------------------
                             Initialization/Cleanup
   -------------------------------------------------------------------------- */

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832
static int __init acpi_bus_init_irq(void)
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833
{
834
	acpi_status status;
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835
	char *message = NULL;
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836 837


838
	/*
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	 * Let the system know what interrupt model we are using by
	 * evaluating the \_PIC object, if exists.
	 */

	switch (acpi_irq_model) {
	case ACPI_IRQ_MODEL_PIC:
		message = "PIC";
		break;
	case ACPI_IRQ_MODEL_IOAPIC:
		message = "IOAPIC";
		break;
	case ACPI_IRQ_MODEL_IOSAPIC:
		message = "IOSAPIC";
		break;
853 854 855
	case ACPI_IRQ_MODEL_GIC:
		message = "GIC";
		break;
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	case ACPI_IRQ_MODEL_PLATFORM:
		message = "platform specific model";
		break;
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	default:
		printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
861
		return -ENODEV;
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	}

	printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);

866
	status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
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	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
868
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
869
		return -ENODEV;
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	}

872
	return 0;
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}

875 876 877 878 879 880 881 882 883 884
/**
 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
 *
 * The ACPI tables are accessible after this, but the handling of events has not
 * been initialized and the global lock is not available yet, so AML should not
 * be executed at this point.
 *
 * Doing this before switching the EFI runtime services to virtual mode allows
 * the EfiBootServices memory to be freed slightly earlier on boot.
 */
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void __init acpi_early_init(void)
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{
887
	acpi_status status;
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	if (acpi_disabled)
890
		return;
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	printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);

894 895 896
	/* It's safe to verify table checksums during late stage */
	acpi_gbl_verify_table_checksum = TRUE;

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	/* enable workarounds, unless strict ACPI spec. compliance */
	if (!acpi_strict)
		acpi_gbl_enable_interpreter_slack = TRUE;

901 902
	acpi_gbl_permanent_mmap = 1;

903 904 905 906 907 908
	/*
	 * If the machine falls into the DMI check table,
	 * DSDT will be copied to memory
	 */
	dmi_check_system(dsdt_dmi_table);

909 910 911 912 913 914 915
	status = acpi_reallocate_root_table();
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX
		       "Unable to reallocate ACPI tables\n");
		goto error0;
	}

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	status = acpi_initialize_subsystem();
	if (ACPI_FAILURE(status)) {
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		printk(KERN_ERR PREFIX
		       "Unable to initialize the ACPI Interpreter\n");
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		goto error0;
	}

923 924 925 926 927 928 929
	if (acpi_gbl_group_module_level_code) {
		status = acpi_load_tables();
		if (ACPI_FAILURE(status)) {
			printk(KERN_ERR PREFIX
			       "Unable to load the System Description Tables\n");
			goto error0;
		}
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	}

#ifdef CONFIG_X86
	if (!acpi_ioapic) {
		/* compatible (0) means level (3) */
935 936 937 938
		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
		}
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		/* Set PIC-mode SCI trigger type */
940
		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
941
					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
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942 943
	} else {
		/*
944
		 * now that acpi_gbl_FADT is initialized,
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945 946
		 * update it with result from INT_SRC_OVR parsing
		 */
947
		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
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	}
#endif
950 951 952 953 954 955 956 957 958
	return;

 error0:
	disable_acpi();
}

/**
 * acpi_subsystem_init - Finalize the early initialization of ACPI.
 *
959
 * Switch over the platform to the ACPI mode (if possible).
960 961 962 963 964 965 966 967 968 969 970
 *
 * Doing this too early is generally unsafe, but at the same time it needs to be
 * done before all things that really depend on ACPI.  The right spot appears to
 * be before finalizing the EFI initialization.
 */
void __init acpi_subsystem_init(void)
{
	acpi_status status;

	if (acpi_disabled)
		return;
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971

972
	status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
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	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
975 976 977 978 979 980 981 982 983
		disable_acpi();
	} else {
		/*
		 * If the system is using ACPI then we can be reasonably
		 * confident that any regulators are managed by the firmware
		 * so tell the regulator core it has everything it needs to
		 * know.
		 */
		regulator_has_full_constraints();
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	}
}

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987
static int __init acpi_bus_init(void)
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988
{
989 990
	int result;
	acpi_status status;
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992
	acpi_os_initialize1();
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	/*
	 * ACPI 2.0 requires the EC driver to be loaded and work before
996 997
	 * the EC device is found in the namespace (i.e. before
	 * acpi_load_tables() is called).
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	 *
999
	 * This is accomplished by looking for the ECDT table, and getting
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	 * the EC parameters out of that.
	 */
	status = acpi_ec_ecdt_probe();
	/* Ignore result. Not having an ECDT is not fatal. */

1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020
	if (!acpi_gbl_group_module_level_code) {
		status = acpi_load_tables();
		if (ACPI_FAILURE(status)) {
			printk(KERN_ERR PREFIX
			       "Unable to load the System Description Tables\n");
			goto error1;
		}
	}

	status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX
		       "Unable to start the ACPI Interpreter\n");
		goto error1;
	}

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	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
		goto error1;
	}

1027 1028 1029
	/* Set capability bits for _OSC under processor scope */
	acpi_early_processor_osc();

1030 1031 1032 1033 1034 1035
	/*
	 * _OSC method may exist in module level code,
	 * so it must be run after ACPI_FULL_INITIALIZATION
	 */
	acpi_bus_osc_support();

1036 1037 1038 1039 1040 1041
	/*
	 * _PDC control method may load dynamic SSDT tables,
	 * and we need to install the table handler before that.
	 */
	acpi_sysfs_init();

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	acpi_early_processor_set_pdc();

1044 1045 1046 1047
	/*
	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
	 * is necessary to enable it as early as possible.
	 */
1048
	acpi_ec_dsdt_probe();
1049

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	printk(KERN_INFO PREFIX "Interpreter enabled\n");

1052 1053 1054
	/* Initialize sleep structures */
	acpi_sleep_init();

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	/*
	 * Get the system interrupt model and evaluate \_PIC.
	 */
	result = acpi_bus_init_irq();
	if (result)
		goto error1;

	/*
	 * Register the for all standard device notifications.
	 */
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	status =
	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
					&acpi_bus_notify, NULL);
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	if (ACPI_FAILURE(status)) {
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		printk(KERN_ERR PREFIX
		       "Unable to register for device notifications\n");
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		goto error1;
	}

	/*
	 * Create the top ACPI proc directory
	 */
	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);

1079 1080 1081
	result = bus_register(&acpi_bus_type);
	if (!result)
		return 0;
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	/* Mimic structured exception handling */
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      error1:
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	acpi_terminate();
1086
	return -ENODEV;
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}

1089
struct kobject *acpi_kobj;
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EXPORT_SYMBOL_GPL(acpi_kobj);
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static int __init acpi_init(void)
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1093
{
1094
	int result;
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	if (acpi_disabled) {
		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1098
		return -ENODEV;
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	}

1101
	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1102
	if (!acpi_kobj) {
1103
		printk(KERN_WARNING "%s: kset create error\n", __func__);
1104 1105
		acpi_kobj = NULL;
	}
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1107
	init_acpi_device_notify();
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1108
	result = acpi_bus_init();
1109
	if (result) {
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		disable_acpi();
1111
		return result;
1112
	}
1113

1114
	pci_mmcfg_late_init();
1115
	acpi_scan_init();
1116
	acpi_ec_init();
1117
	acpi_debugfs_init();
1118
	acpi_sleep_proc_init();
1119
	acpi_wakeup_device_init();
1120
	acpi_debugger_init();
1121
	return 0;
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}

subsys_initcall(acpi_init);