Merge tag 'ipe-pr-20260925' of git://git.kernel.org/pub/scm/linux/kernel/git/wufan/ipegrafted

Pull IPE fixes from Fan Wu:
 "Two fixes for use-after-free issues found by recent LLM-assisted code
  analysis.

   - move successful policy load auditing under the new policy
     directory's inode lock, preventing a concurrent policy deletion
     from freeing the policy while it is still being audited

   - protect the dm-verity root hash with RCU, preventing policy
     evaluation from racing with root hash replacement during preresume"

* tag 'ipe-pr-20260925' of git://git.kernel.org/pub/scm/linux/kernel/git/wufan/ipe:
  ipe: protect the dm-verity root hash with RCU
  ipe: fix use-after-free when auditing a newly loaded policy

1 files changed, 1510 insertions, 0 deletions

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
new file mode 100644
index 000000000..808c6746b
--- /dev/null
+++ b/drivers/acpi/bus.c
@@ -0,0 +1,1510 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
+ *
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ */
+
+#define pr_fmt(fmt) "ACPI: " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/sched.h>
+#include <linux/pm.h>
+#include <linux/device.h>
+#include <linux/proc_fs.h>
+#include <linux/acpi.h>
+#include <linux/slab.h>
+#include <linux/regulator/machine.h>
+#include <linux/workqueue.h>
+#include <linux/reboot.h>
+#include <linux/delay.h>
+#ifdef CONFIG_X86
+#include <asm/mpspec.h>
+#include <linux/dmi.h>
+#endif
+#include <linux/acpi_viot.h>
+#include <linux/pci.h>
+#include <acpi/apei.h>
+#include <linux/suspend.h>
+#include <linux/prmt.h>
+
+#include "internal.h"
+
+struct acpi_device *acpi_root;
+struct proc_dir_entry *acpi_root_dir;
+EXPORT_SYMBOL(acpi_root_dir);
+
+#ifdef CONFIG_X86
+#ifdef CONFIG_ACPI_CUSTOM_DSDT
+static inline int set_copy_dsdt(const struct dmi_system_id *id)
+{
+	return 0;
+}
+#else
+static int set_copy_dsdt(const struct dmi_system_id *id)
+{
+	pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);
+	acpi_gbl_copy_dsdt_locally = 1;
+	return 0;
+}
+#endif
+
+static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
+	/*
+	 * Invoke DSDT corruption work-around on all Toshiba Satellite.
+	 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
+	 */
+	{
+	 .callback = set_copy_dsdt,
+	 .ident = "TOSHIBA Satellite",
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
+		},
+	},
+	{}
+};
+#endif
+
+/* --------------------------------------------------------------------------
+                                Device Management
+   -------------------------------------------------------------------------- */
+
+acpi_status acpi_bus_get_status_handle(acpi_handle handle,
+				       unsigned long long *sta)
+{
+	acpi_status status;
+
+	status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
+	if (ACPI_SUCCESS(status))
+		return AE_OK;
+
+	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;
+	}
+	return status;
+}
+EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
+
+int acpi_bus_get_status(struct acpi_device *device)
+{
+	acpi_status status;
+	unsigned long long sta;
+
+	if (acpi_device_override_status(device, &sta)) {
+		acpi_set_device_status(device, sta);
+		return 0;
+	}
+
+	/* Battery devices must have their deps met before calling _STA */
+	if (acpi_device_is_battery(device) && device->dep_unmet) {
+		acpi_set_device_status(device, 0);
+		return 0;
+	}
+
+	status = acpi_bus_get_status_handle(device->handle, &sta);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	if (!device->status.present && device->status.enabled) {
+		pr_info(FW_BUG "Device [%s] status [%08x]: not present and enabled\n",
+			device->pnp.bus_id, (u32)sta);
+		device->status.enabled = 0;
+		/*
+		 * The status is clearly invalid, so clear the functional bit as
+		 * well to avoid attempting to use the device.
+		 */
+		device->status.functional = 0;
+	}
+
+	acpi_set_device_status(device, sta);
+
+	if (device->status.functional && !device->status.present) {
+		pr_debug("Device [%s] status [%08x]: functional but not present\n",
+			 device->pnp.bus_id, (u32)sta);
+	}
+
+	pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
+	return 0;
+}
+EXPORT_SYMBOL(acpi_bus_get_status);
+
+void acpi_bus_private_data_handler(acpi_handle handle,
+				   void *context)
+{
+	return;
+}
+EXPORT_SYMBOL(acpi_bus_private_data_handler);
+
+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);
+
+int acpi_bus_get_private_data(acpi_handle handle, void **data)
+{
+	acpi_status status;
+
+	if (!data)
+		return -EINVAL;
+
+	status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
+	if (ACPI_FAILURE(status)) {
+		acpi_handle_debug(handle, "No context for object\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+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);
+
+static void acpi_dump_osc_data(acpi_handle handle, const guid_t *guid, int rev,
+			       struct acpi_buffer *cap)
+{
+	u32 *capbuf = cap->pointer;
+	int i;
+
+	acpi_handle_debug(handle, "_OSC: UUID: %pUL, rev: %d\n", guid, rev);
+	for (i = 0; i < cap->length / sizeof(u32); i++)
+		acpi_handle_debug(handle, "_OSC: capabilities DWORD %i: [%08x]\n",
+				  i, capbuf[i]);
+}
+
+#define OSC_ERROR_MASK 	(OSC_REQUEST_ERROR | OSC_INVALID_UUID_ERROR | \
+			 OSC_INVALID_REVISION_ERROR | \
+			 OSC_CAPABILITIES_MASK_ERROR)
+
+static int acpi_eval_osc(acpi_handle handle, guid_t *guid, int rev,
+			 struct acpi_buffer *cap,
+			 union acpi_object in_params[at_least 4],
+			 struct acpi_buffer *output)
+{
+	struct acpi_object_list input;
+	union acpi_object *out_obj;
+	acpi_status status;
+
+	in_params[0].type = ACPI_TYPE_BUFFER;
+	in_params[0].buffer.length = sizeof(*guid);
+	in_params[0].buffer.pointer = (u8 *)guid;
+	in_params[1].type = ACPI_TYPE_INTEGER;
+	in_params[1].integer.value = rev;
+	in_params[2].type = ACPI_TYPE_INTEGER;
+	in_params[2].integer.value = cap->length / sizeof(u32);
+	in_params[3].type = ACPI_TYPE_BUFFER;
+	in_params[3].buffer.length = cap->length;
+	in_params[3].buffer.pointer = cap->pointer;
+	input.pointer = in_params;
+	input.count = 4;
+
+	output->length = ACPI_ALLOCATE_BUFFER;
+	output->pointer = NULL;
+
+	status = acpi_evaluate_object(handle, "_OSC", &input, output);
+	if (ACPI_FAILURE(status) || !output->length)
+		return -ENODATA;
+
+	out_obj = output->pointer;
+	if (out_obj->type != ACPI_TYPE_BUFFER ||
+	    out_obj->buffer.length != cap->length) {
+		acpi_handle_debug(handle, "Invalid _OSC return buffer\n");
+		acpi_dump_osc_data(handle, guid, rev, cap);
+		ACPI_FREE(out_obj);
+		return -ENODATA;
+	}
+
+	return 0;
+}
+
+static bool acpi_osc_error_check(acpi_handle handle, guid_t *guid, int rev,
+				 struct acpi_buffer *cap, u32 *retbuf)
+{
+	/* Only take defined error bits into account. */
+	u32 errors = retbuf[OSC_QUERY_DWORD] & OSC_ERROR_MASK;
+	u32 *capbuf = cap->pointer;
+	bool fail;
+
+	/*
+	 * If OSC_QUERY_ENABLE is set, ignore the "capabilities masked"
+	 * bit because it merely means that some features have not been
+	 * acknowledged which is not unexpected.
+	 */
+	if (capbuf[OSC_QUERY_DWORD] & OSC_QUERY_ENABLE)
+		errors &= ~OSC_CAPABILITIES_MASK_ERROR;
+
+	if (!errors)
+		return false;
+
+	acpi_dump_osc_data(handle, guid, rev, cap);
+	/*
+	 * As a rule, fail only if OSC_QUERY_ENABLE is set because otherwise the
+	 * acknowledged features need to be controlled.
+	 */
+	fail = !!(capbuf[OSC_QUERY_DWORD] & OSC_QUERY_ENABLE);
+
+	if (errors & OSC_REQUEST_ERROR)
+		acpi_handle_debug(handle, "_OSC: request failed\n");
+
+	if (errors & OSC_INVALID_UUID_ERROR) {
+		acpi_handle_debug(handle, "_OSC: invalid UUID\n");
+		/*
+		 * Always fail if this bit is set because it means that the
+		 * request could not be processed.
+		 */
+		fail = true;
+	}
+
+	if (errors & OSC_INVALID_REVISION_ERROR)
+		acpi_handle_debug(handle, "_OSC: invalid revision\n");
+
+	if (errors & OSC_CAPABILITIES_MASK_ERROR)
+		acpi_handle_debug(handle, "_OSC: capability bits masked\n");
+
+	return fail;
+}
+
+acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
+{
+	union acpi_object in_params[4], *out_obj;
+	struct acpi_buffer output;
+	acpi_status status = AE_OK;
+	guid_t guid;
+	u32 *retbuf;
+	int ret;
+
+	if (!context || !context->cap.pointer ||
+	    context->cap.length < 2 * sizeof(u32) ||
+	    guid_parse(context->uuid_str, &guid))
+		return AE_BAD_PARAMETER;
+
+	ret = acpi_eval_osc(handle, &guid, context->rev, &context->cap,
+			    in_params, &output);
+	if (ret)
+		return AE_ERROR;
+
+	out_obj = output.pointer;
+	retbuf = (u32 *)out_obj->buffer.pointer;
+
+	if (acpi_osc_error_check(handle, &guid, context->rev, &context->cap, retbuf)) {
+		status = AE_ERROR;
+		goto out;
+	}
+
+	context->ret.length = out_obj->buffer.length;
+	context->ret.pointer = kmemdup(retbuf, context->ret.length, GFP_KERNEL);
+	if (!context->ret.pointer) {
+		status =  AE_NO_MEMORY;
+		goto out;
+	}
+	status =  AE_OK;
+
+out:
+	ACPI_FREE(out_obj);
+	return status;
+}
+EXPORT_SYMBOL(acpi_run_osc);
+
+static int acpi_osc_handshake(acpi_handle handle, const char *uuid_str,
+			      int rev, u32 *capbuf, size_t bufsize)
+{
+	union acpi_object in_params[4], *out_obj;
+	struct acpi_object_list input;
+	struct acpi_buffer cap = {
+		.pointer = capbuf,
+		.length = bufsize * sizeof(u32),
+	};
+	struct acpi_buffer output;
+	u32 *retbuf, test, errors;
+	guid_t guid;
+	int ret, i;
+
+	if (!capbuf || bufsize < 2 || guid_parse(uuid_str, &guid))
+		return -EINVAL;
+
+	/* First evaluate _OSC with OSC_QUERY_ENABLE set. */
+	capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
+
+	ret = acpi_eval_osc(handle, &guid, rev, &cap, in_params, &output);
+	if (ret)
+		return ret;
+
+	out_obj = output.pointer;
+	retbuf = (u32 *)out_obj->buffer.pointer;
+
+	if (acpi_osc_error_check(handle, &guid, rev, &cap, retbuf)) {
+		ret = -ENODATA;
+		goto out;
+	}
+
+	/*
+	 * Clear the feature bits in the capabilities buffer that have not been
+	 * acknowledged and clear the return buffer.
+	 */
+	for (i = OSC_QUERY_DWORD + 1, test = 0; i < bufsize; i++) {
+		capbuf[i] &= retbuf[i];
+		test |= capbuf[i];
+		retbuf[i] = 0;
+	}
+	/*
+	 * If none of the feature bits have been acknowledged, there's nothing
+	 * more to do.  capbuf[] contains a feature mask of all zeros.
+	 */
+	if (!test)
+		goto out;
+
+	retbuf[OSC_QUERY_DWORD] = 0;
+	/*
+	 * Now evaluate _OSC again (directly) with OSC_QUERY_ENABLE clear and
+	 * the updated input and output buffers used before.  Since the feature
+	 * bits that were clear in the return buffer from the previous _OSC
+	 * evaluation are also clear in the capabilities buffer now, this _OSC
+	 * evaluation is not expected to fail.
+	 */
+	capbuf[OSC_QUERY_DWORD] = 0;
+	/* Reuse in_params[] populated by acpi_eval_osc(). */
+	input.pointer = in_params;
+	input.count = 4;
+
+	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_OSC", &input, &output))) {
+		ret = -ENODATA;
+		goto out;
+	}
+
+	/*
+	 * Clear the feature bits in capbuf[] that have not been acknowledged.
+	 * After that, capbuf[] contains the resultant feature mask.
+	 */
+	for (i = OSC_QUERY_DWORD + 1, test = 0; i < bufsize; i++) {
+		test |= capbuf[i] & ~retbuf[i];
+		capbuf[i] &= retbuf[i];
+	}
+
+	errors = retbuf[OSC_QUERY_DWORD] & OSC_ERROR_MASK;
+	/*
+	 * Some platforms set OSC_CAPABILITIES_MASK_ERROR even though they
+	 * acknowledge all of the requested features, so avoid complaining in
+	 * those cases unless any other error bits are also set.
+	 */
+	if (errors && (test || errors != OSC_CAPABILITIES_MASK_ERROR)) {
+		/*
+		 * Complain about the unexpected errors and print diagnostic
+		 * information related to them.
+		 */
+		acpi_handle_err(handle, "_OSC: errors while processing control request\n");
+		acpi_handle_err(handle, "_OSC: some features may be missing\n");
+		acpi_osc_error_check(handle, &guid, rev, &cap, retbuf);
+	}
+
+out:
+	ACPI_FREE(out_obj);
+	return ret;
+}
+
+bool osc_sb_apei_support_acked;
+
+/*
+ * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
+ * OSPM supports platform coordinated low power idle(LPI) states
+ */
+bool osc_pc_lpi_support_confirmed;
+EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
+
+/*
+ * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':
+ *   Starting with ACPI Specification 6.2, all _CPC registers can be in
+ *   PCC, System Memory, System IO, or Functional Fixed Hardware address
+ *   spaces. OSPM support for this more flexible register space scheme is
+ *   indicated by the “Flexible Address Space for CPPC Registers” _OSC bit.
+ *
+ * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:
+ * - PCC or Functional Fixed Hardware address space if defined
+ * - SystemMemory address space (NULL register) if not defined
+ */
+bool osc_cpc_flexible_adr_space_confirmed;
+EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
+
+/*
+ * ACPI 6.4 Operating System Capabilities for USB.
+ */
+bool osc_sb_native_usb4_support_confirmed;
+EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
+
+bool osc_sb_cppc2_support_acked;
+
+static void acpi_bus_osc_negotiate_platform_control(void)
+{
+	static const u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
+	u32 capbuf[2], feature_mask;
+	acpi_handle handle;
+
+	feature_mask = OSC_SB_PR3_SUPPORT | OSC_SB_HOTPLUG_OST_SUPPORT |
+			OSC_SB_PCLPI_SUPPORT | OSC_SB_OVER_16_PSTATES_SUPPORT |
+			OSC_SB_GED_SUPPORT | OSC_SB_IRQ_RESOURCE_SOURCE_SUPPORT;
+
+	if (IS_ENABLED(CONFIG_ARM64) || IS_ENABLED(CONFIG_X86))
+		feature_mask |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
+
+	if (IS_ENABLED(CONFIG_ACPI_CPPC_LIB)) {
+		feature_mask |= OSC_SB_CPC_SUPPORT | OSC_SB_CPCV2_SUPPORT |
+				OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
+		if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
+			feature_mask |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
+	}
+
+	if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
+		feature_mask |= OSC_SB_PAD_SUPPORT;
+
+	if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
+		feature_mask |= OSC_SB_PPC_OST_SUPPORT;
+
+	if (IS_ENABLED(CONFIG_ACPI_THERMAL))
+		feature_mask |= OSC_SB_FAST_THERMAL_SAMPLING_SUPPORT;
+
+	if (IS_ENABLED(CONFIG_ACPI_BATTERY))
+		feature_mask |= OSC_SB_BATTERY_CHARGE_LIMITING_SUPPORT;
+
+	if (IS_ENABLED(CONFIG_ACPI_PRMT))
+		feature_mask |= OSC_SB_PRM_SUPPORT;
+
+	if (IS_ENABLED(CONFIG_ACPI_FFH))
+		feature_mask |= OSC_SB_FFH_OPR_SUPPORT;
+
+	if (IS_ENABLED(CONFIG_USB4))
+		feature_mask |= OSC_SB_NATIVE_USB4_SUPPORT;
+
+	if (!ghes_disable)
+		feature_mask |= OSC_SB_APEI_SUPPORT;
+
+	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
+		return;
+
+	capbuf[OSC_SUPPORT_DWORD] = feature_mask;
+
+	acpi_handle_info(handle, "platform _OSC: OS support mask [%08x]\n", feature_mask);
+
+	if (acpi_osc_handshake(handle, sb_uuid_str, 1, capbuf, ARRAY_SIZE(capbuf)))
+		return;
+
+	feature_mask = capbuf[OSC_SUPPORT_DWORD];
+
+	acpi_handle_info(handle, "platform _OSC: OS control mask [%08x]\n", feature_mask);
+
+	osc_sb_cppc2_support_acked = feature_mask & OSC_SB_CPCV2_SUPPORT;
+	osc_sb_apei_support_acked = feature_mask & OSC_SB_APEI_SUPPORT;
+	osc_pc_lpi_support_confirmed = feature_mask & OSC_SB_PCLPI_SUPPORT;
+	osc_sb_native_usb4_support_confirmed = feature_mask & OSC_SB_NATIVE_USB4_SUPPORT;
+	osc_cpc_flexible_adr_space_confirmed = feature_mask & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
+}
+
+/*
+ * Native control of USB4 capabilities. If any of the tunneling bits is
+ * set it means OS is in control and we use software based connection
+ * manager.
+ */
+u32 osc_sb_native_usb4_control;
+EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
+
+static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
+{
+	pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
+	       (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
+	       (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
+	       (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
+	       (bits & OSC_USB_XDOMAIN) ? '+' : '-');
+}
+
+static void acpi_bus_osc_negotiate_usb_control(void)
+{
+	static const u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
+	u32 capbuf[3], control;
+	acpi_handle handle;
+
+	if (!osc_sb_native_usb4_support_confirmed)
+		return;
+
+	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
+		return;
+
+	control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
+		  OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
+
+	capbuf[OSC_SUPPORT_DWORD] = 0;
+	capbuf[OSC_CONTROL_DWORD] = control;
+
+	if (acpi_osc_handshake(handle, sb_usb_uuid_str, 1, capbuf, ARRAY_SIZE(capbuf)))
+		return;
+
+	osc_sb_native_usb4_control = capbuf[OSC_CONTROL_DWORD];
+
+	acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
+	acpi_bus_decode_usb_osc("USB4 _OSC: OS controls", osc_sb_native_usb4_control);
+}
+
+/* --------------------------------------------------------------------------
+                             Notification Handling
+   -------------------------------------------------------------------------- */
+
+/**
+ * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler
+ * @handle: Target ACPI object.
+ * @type: Notification type.
+ * @data: Ignored.
+ *
+ * This only handles notifications related to device hotplug.
+ */
+static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
+{
+	struct acpi_device *adev;
+
+	switch (type) {
+	case ACPI_NOTIFY_BUS_CHECK:
+		acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
+		break;
+
+	case ACPI_NOTIFY_DEVICE_CHECK:
+		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
+		break;
+
+	case ACPI_NOTIFY_DEVICE_WAKE:
+		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
+		return;
+
+	case ACPI_NOTIFY_EJECT_REQUEST:
+		acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
+		break;
+
+	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
+		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
+		/* TBD: Exactly what does 'light' mean? */
+		return;
+
+	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
+		acpi_handle_err(handle, "Device cannot be configured due "
+				"to a frequency mismatch\n");
+		return;
+
+	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
+		acpi_handle_err(handle, "Device cannot be configured due "
+				"to a bus mode mismatch\n");
+		return;
+
+	case ACPI_NOTIFY_POWER_FAULT:
+		acpi_handle_err(handle, "Device has suffered a power fault\n");
+		return;
+
+	default:
+		acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
+		return;
+	}
+
+	adev = acpi_get_acpi_dev(handle);
+
+	if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
+		return;
+
+	acpi_put_acpi_dev(adev);
+
+	acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
+}
+
+int acpi_dev_install_notify_handler(struct acpi_device *adev,
+				    u32 handler_type,
+				    acpi_notify_handler handler, void *context)
+{
+	acpi_status status;
+
+	status = acpi_install_notify_handler(adev->handle, handler_type,
+					     handler, context);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler);
+
+void acpi_dev_remove_notify_handler(struct acpi_device *adev,
+				    u32 handler_type,
+				    acpi_notify_handler handler)
+{
+	acpi_remove_notify_handler(adev->handle, handler_type, handler);
+	acpi_os_wait_events_complete();
+}
+EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler);
+
+struct acpi_notify_handler_devres {
+	struct acpi_device *adev;
+	acpi_notify_handler handler;
+	u32 handler_type;
+};
+
+static void devm_acpi_notify_handler_release(struct device *dev, void *res)
+{
+	struct acpi_notify_handler_devres *dr = res;
+
+	acpi_dev_remove_notify_handler(dr->adev, dr->handler_type, dr->handler);
+}
+
+/**
+ * devm_acpi_install_notify_handler - Install an ACPI notify handler for a
+ *				      managed device
+ * @dev: Device to install a notify handler for
+ * @handler_type: Type of the notify handler
+ * @handler: Handler function to install
+ * @context: Data passed back to the handler function
+ *
+ * This function performs the same function as acpi_dev_install_notify_handler()
+ * called for the ACPI companion of @dev with the same @handler_type, @handler,
+ * and @context arguments, but the ACPI notify handler installed by it will be
+ * automatically removed on driver detach.
+ *
+ * Callers should ensure that all resources used by @handler have been allocated
+ * prior to invoking this function, in which case those resources should be
+ * devres-managed so that they won't be released before the notify handler
+ * removal.  Otherwise, special synchronization between @handler and the
+ * management of those resources is required.
+ *
+ * When the request fails, an error message is printed.  Don't add extra error
+ * messages at the call sites.
+ *
+ * Return: 0 on success or a negative error number.
+ */
+int devm_acpi_install_notify_handler(struct device *dev, u32 handler_type,
+				     acpi_notify_handler handler, void *context)
+{
+	struct acpi_notify_handler_devres *dr;
+	struct acpi_device *adev;
+	int ret;
+
+	adev = ACPI_COMPANION(dev);
+	if (!adev)
+		return dev_err_probe(dev, -ENODEV, "No ACPI companion\n");
+
+	dr = devres_alloc(devm_acpi_notify_handler_release, sizeof(*dr), GFP_KERNEL);
+	if (!dr)
+		return -ENOMEM;
+
+	ret = acpi_dev_install_notify_handler(adev, handler_type, handler, context);
+	if (ret) {
+		devres_free(dr);
+		return dev_err_probe(dev, ret, "Failed to install an ACPI notify handler\n");
+	}
+
+	dr->adev = adev;
+	dr->handler = handler;
+	dr->handler_type = handler_type;
+	devres_add(dev, dr);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_acpi_install_notify_handler);
+
+/* Handle events targeting \_SB device (at present only graceful shutdown) */
+
+#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
+#define ACPI_SB_INDICATE_INTERVAL	10000
+
+static void sb_notify_work(struct work_struct *dummy)
+{
+	acpi_handle sb_handle;
+
+	orderly_poweroff(true);
+
+	/*
+	 * After initiating graceful shutdown, the ACPI spec requires OSPM
+	 * to evaluate _OST method once every 10seconds to indicate that
+	 * the shutdown is in progress
+	 */
+	acpi_get_handle(NULL, "\\_SB", &sb_handle);
+	while (1) {
+		pr_info("Graceful shutdown in progress.\n");
+		acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
+				ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
+		msleep(ACPI_SB_INDICATE_INTERVAL);
+	}
+}
+
+static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
+{
+	static DECLARE_WORK(acpi_sb_work, sb_notify_work);
+
+	if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
+		if (!work_busy(&acpi_sb_work))
+			schedule_work(&acpi_sb_work);
+	} else {
+		pr_warn("event %x is not supported by \\_SB device\n", event);
+	}
+}
+
+static int __init acpi_setup_sb_notify_handler(void)
+{
+	acpi_handle sb_handle;
+
+	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
+		return -ENXIO;
+
+	if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
+						acpi_sb_notify, NULL)))
+		return -EINVAL;
+
+	return 0;
+}
+
+/* --------------------------------------------------------------------------
+                             Device Matching
+   -------------------------------------------------------------------------- */
+
+
+static struct device *primary_physical_device(struct acpi_device *adev)
+{
+	struct acpi_device_physical_node *pn;
+
+	pn = list_first_entry_or_null(&adev->physical_node_list,
+				      struct acpi_device_physical_node, node);
+	if (pn)
+		return pn->dev;
+
+	return NULL;
+}
+
+/**
+ * acpi_bus_get_primary_device - Get first physical device for a given ACPI one
+ * @adev: ACPI device to get the first physical device for.
+ *
+ * Find the first physical device for which @adev is the ACPI companion and
+ * reference count it if present.
+ *
+ * Return: Pointer to the first physical counterpart of @adev or NULL if there
+ * are none.  Callers are responsible for invoking put_device() on the returned
+ * device.
+ */
+struct device *acpi_bus_get_primary_device(struct acpi_device *adev)
+{
+	if (!adev)
+		return NULL;
+
+	guard(mutex)(&adev->physical_node_lock);
+
+	return get_device(primary_physical_device(adev));
+}
+EXPORT_SYMBOL_GPL(acpi_bus_get_primary_device);
+
+/**
+ * acpi_get_first_physical_node - Find 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)
+{
+	guard(mutex)(&adev->physical_node_lock);
+
+	return primary_physical_device(adev);
+}
+EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
+
+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;
+}
+
+/**
+ * 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)
+{
+	return !!acpi_primary_dev_companion(adev, dev);
+}
+
+/*
+ * 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).
+ */
+const 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;
+
+	return acpi_primary_dev_companion(adev, dev);
+}
+
+/**
+ * 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.
+ * @of_id: OF ID if matched
+ *
+ * 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(const struct acpi_device *adev,
+				 const struct of_device_id *of_match_table,
+				 const struct of_device_id **of_id)
+{
+	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)) {
+				if (of_id)
+					*of_id = id;
+				return true;
+			}
+	}
+
+	return false;
+}
+
+static bool acpi_of_modalias(struct acpi_device *adev,
+			     char *modalias, size_t len)
+{
+	const union acpi_object *of_compatible;
+	const union acpi_object *obj;
+	const char *str, *chr;
+
+	of_compatible = adev->data.of_compatible;
+	if (!of_compatible)
+		return false;
+
+	if (of_compatible->type == ACPI_TYPE_PACKAGE)
+		obj = of_compatible->package.elements;
+	else /* Must be ACPI_TYPE_STRING. */
+		obj = of_compatible;
+
+	str = obj->string.pointer;
+	chr = strchr(str, ',');
+	strscpy(modalias, chr ? chr + 1 : str, len);
+
+	return true;
+}
+
+/**
+ * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
+ * @adev:	ACPI device object to match
+ * @default_id:	ID string to use as default if no compatible string found
+ * @modalias:   Pointer to buffer that modalias value will be copied into
+ * @len:	Length of modalias buffer
+ *
+ * This is a counterpart of of_alias_from_compatible() for struct acpi_device
+ * objects. If there is a compatible string for @adev, it will be copied to
+ * @modalias with the vendor prefix stripped; otherwise, @default_id will be
+ * used.
+ */
+void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
+		       char *modalias, size_t len)
+{
+	if (!acpi_of_modalias(adev, modalias, len))
+		strscpy(modalias, default_id, len);
+}
+EXPORT_SYMBOL_GPL(acpi_set_modalias);
+
+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 bool __acpi_match_device(const struct acpi_device *device,
+				const struct acpi_device_id *acpi_ids,
+				const struct of_device_id *of_ids,
+				const struct acpi_device_id **acpi_id,
+				const struct of_device_id **of_id)
+{
+	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 false;
+
+	list_for_each_entry(hwid, &device->pnp.ids, list) {
+		/* First, check the ACPI/PNP IDs provided by the caller. */
+		if (acpi_ids) {
+			for (id = acpi_ids; id->id[0] || id->cls; id++) {
+				if (id->id[0] && !strcmp((char *)id->id, hwid->id))
+					goto out_acpi_match;
+				if (id->cls && __acpi_match_device_cls(id, hwid))
+					goto out_acpi_match;
+			}
+		}
+
+		/*
+		 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
+		 * "compatible" property if found.
+		 */
+		if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
+			return acpi_of_match_device(device, of_ids, of_id);
+	}
+	return false;
+
+out_acpi_match:
+	if (acpi_id)
+		*acpi_id = id;
+	return true;
+}
+
+/**
+ * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs
+ * @ids: Array of struct acpi_device_id objects to match against.
+ * @adev: The ACPI device pointer to match.
+ *
+ * Match the ACPI device @adev against a given list of ACPI IDs @ids.
+ *
+ * Return:
+ * a pointer to the first matching ACPI ID on success or %NULL on failure.
+ */
+const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids,
+						    const struct acpi_device *adev)
+{
+	const struct acpi_device_id *id = NULL;
+
+	__acpi_match_device(adev, ids, NULL, &id, NULL);
+	return id;
+}
+EXPORT_SYMBOL_GPL(acpi_match_acpi_device);
+
+/**
+ * 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_acpi_device(ids, acpi_companion_match(dev));
+}
+EXPORT_SYMBOL_GPL(acpi_match_device);
+
+const void *acpi_device_get_match_data(const struct device *dev)
+{
+	const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;
+	const struct of_device_id *of_ids = dev->driver->of_match_table;
+	const struct acpi_device *adev = acpi_companion_match(dev);
+	const struct acpi_device_id *acpi_id = NULL;
+	const struct of_device_id *of_id = NULL;
+
+	if (!__acpi_match_device(adev, acpi_ids, of_ids, &acpi_id, &of_id))
+		return NULL;
+
+	if (acpi_id)
+		return (const void *)acpi_id->driver_data;
+
+	if (of_id)
+		return of_id->data;
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
+
+int acpi_match_device_ids(struct acpi_device *device,
+			  const struct acpi_device_id *ids)
+{
+	return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
+}
+EXPORT_SYMBOL(acpi_match_device_ids);
+
+bool acpi_driver_match_device(struct device *dev,
+			      const struct device_driver *drv)
+{
+	const struct acpi_device_id *acpi_ids = drv->acpi_match_table;
+	const struct of_device_id *of_ids = drv->of_match_table;
+
+	if (!acpi_ids)
+		return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL);
+
+	return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);
+}
+EXPORT_SYMBOL_GPL(acpi_driver_match_device);
+
+/* --------------------------------------------------------------------------
+                              ACPI Bus operations
+   -------------------------------------------------------------------------- */
+
+static int acpi_bus_match(struct device *dev, const struct device_driver *drv)
+{
+	return 0;
+}
+
+static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
+{
+	return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
+}
+
+const struct bus_type acpi_bus_type = {
+	.name		= "acpi",
+	.match		= acpi_bus_match,
+	.uevent		= acpi_device_uevent,
+};
+
+int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
+{
+	return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
+}
+EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
+
+/**
+ * acpi_bus_find_device_by_name() - Locate an ACPI device by its name
+ * @name: Name of the device to match
+ *
+ * The caller is responsible for calling put_device() on the returned object.
+ *
+ * Returns:
+ * New reference to the matched device or NULL if the device can't be found.
+ */
+struct device *acpi_bus_find_device_by_name(const char *name)
+{
+	return bus_find_device_by_name(&acpi_bus_type, NULL, name);
+}
+EXPORT_SYMBOL_GPL(acpi_bus_find_device_by_name);
+
+struct acpi_dev_walk_context {
+	int (*fn)(struct acpi_device *, void *);
+	void *data;
+};
+
+static int acpi_dev_for_one_check(struct device *dev, void *context)
+{
+	struct acpi_dev_walk_context *adwc = context;
+
+	if (dev->bus != &acpi_bus_type)
+		return 0;
+
+	return adwc->fn(to_acpi_device(dev), adwc->data);
+}
+EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
+
+int acpi_dev_for_each_child(struct acpi_device *adev,
+			    int (*fn)(struct acpi_device *, void *), void *data)
+{
+	struct acpi_dev_walk_context adwc = {
+		.fn = fn,
+		.data = data,
+	};
+
+	return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
+}
+
+int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
+				    int (*fn)(struct acpi_device *, void *),
+				    void *data)
+{
+	struct acpi_dev_walk_context adwc = {
+		.fn = fn,
+		.data = data,
+	};
+
+	return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
+}
+
+/* --------------------------------------------------------------------------
+                             Initialization/Cleanup
+   -------------------------------------------------------------------------- */
+
+static int __init acpi_bus_init_irq(void)
+{
+	acpi_status status;
+	char *message = NULL;
+
+
+	/*
+	 * 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;
+	case ACPI_IRQ_MODEL_GIC:
+		message = "GIC";
+		break;
+	case ACPI_IRQ_MODEL_GIC_V5:
+		message = "GICv5";
+		break;
+	case ACPI_IRQ_MODEL_PLATFORM:
+		message = "platform specific model";
+		break;
+	case ACPI_IRQ_MODEL_LPIC:
+		message = "LPIC";
+		break;
+	case ACPI_IRQ_MODEL_RINTC:
+		message = "RINTC";
+		break;
+	default:
+		pr_info("Unknown interrupt routing model\n");
+		return -ENODEV;
+	}
+
+	pr_info("Using %s for interrupt routing\n", message);
+
+	status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
+	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
+		pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+/**
+ * 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.
+ */
+void __init acpi_early_init(void)
+{
+	acpi_status status;
+
+	if (acpi_disabled)
+		return;
+
+	pr_info("Core revision %08x\n", ACPI_CA_VERSION);
+
+	/* enable workarounds, unless strict ACPI spec. compliance */
+	if (!acpi_strict)
+		acpi_gbl_enable_interpreter_slack = TRUE;
+
+	acpi_permanent_mmap = true;
+
+#ifdef CONFIG_X86
+	/*
+	 * If the machine falls into the DMI check table,
+	 * DSDT will be copied to memory.
+	 * Note that calling dmi_check_system() here on other architectures
+	 * would not be OK because only x86 initializes dmi early enough.
+	 * Thankfully only x86 systems need such quirks for now.
+	 */
+	dmi_check_system(dsdt_dmi_table);
+#endif
+
+	status = acpi_reallocate_root_table();
+	if (ACPI_FAILURE(status)) {
+		pr_err("Unable to reallocate ACPI tables\n");
+		goto error0;
+	}
+
+	status = acpi_initialize_subsystem();
+	if (ACPI_FAILURE(status)) {
+		pr_err("Unable to initialize the ACPI Interpreter\n");
+		goto error0;
+	}
+
+#ifdef CONFIG_X86
+	if (!acpi_ioapic) {
+		/* compatible (0) means level (3) */
+		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
+			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
+			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
+		}
+		/* Set PIC-mode SCI trigger type */
+		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
+					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
+	} else {
+		/*
+		 * now that acpi_gbl_FADT is initialized,
+		 * update it with result from INT_SRC_OVR parsing
+		 */
+		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
+	}
+#endif
+	return;
+
+ error0:
+	disable_acpi();
+}
+
+/**
+ * acpi_subsystem_init - Finalize the early initialization of ACPI.
+ *
+ * Switch over the platform to the ACPI mode (if possible).
+ *
+ * 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;
+
+	status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
+	if (ACPI_FAILURE(status)) {
+		pr_err("Unable to enable ACPI\n");
+		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();
+	}
+}
+
+static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
+{
+	if (event == ACPI_TABLE_EVENT_LOAD)
+		acpi_scan_table_notify();
+
+	return acpi_sysfs_table_handler(event, table, context);
+}
+
+static int __init acpi_bus_init(void)
+{
+	int result;
+	acpi_status status;
+
+	acpi_os_initialize1();
+
+	status = acpi_load_tables();
+	if (ACPI_FAILURE(status)) {
+		pr_err("Unable to load the System Description Tables\n");
+		goto error1;
+	}
+
+	/*
+	 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
+	 * device is found in the namespace.
+	 *
+	 * This is accomplished by looking for the ECDT table and getting the EC
+	 * parameters out of that.
+	 *
+	 * Do that before calling acpi_initialize_objects() which may trigger EC
+	 * address space accesses.
+	 */
+	acpi_ec_ecdt_probe();
+
+	status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
+	if (ACPI_FAILURE(status)) {
+		pr_err("Unable to start the ACPI Interpreter\n");
+		goto error1;
+	}
+
+	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
+	if (ACPI_FAILURE(status)) {
+		pr_err("Unable to initialize ACPI objects\n");
+		goto error1;
+	}
+
+	/*
+	 * _OSC method may exist in module level code,
+	 * so it must be run after ACPI_FULL_INITIALIZATION
+	 */
+	acpi_bus_osc_negotiate_platform_control();
+	acpi_bus_osc_negotiate_usb_control();
+
+	/*
+	 * _PDC control method may load dynamic SSDT tables,
+	 * and we need to install the table handler before that.
+	 */
+	status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
+
+	acpi_sysfs_init();
+
+	acpi_early_processor_control_setup();
+
+	/*
+	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
+	 * is necessary to enable it as early as possible.
+	 */
+	acpi_ec_dsdt_probe();
+
+	pr_info("Interpreter enabled\n");
+
+	/* Initialize sleep structures */
+	acpi_sleep_init();
+
+	/*
+	 * Get the system interrupt model and evaluate \_PIC.
+	 */
+	result = acpi_bus_init_irq();
+	if (result)
+		goto error1;
+
+	/*
+	 * Register for all standard device notifications.
+	 */
+	status =
+	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
+					&acpi_bus_notify, NULL);
+	if (ACPI_FAILURE(status)) {
+		pr_err("Unable to register for system notifications\n");
+		goto error1;
+	}
+
+	/*
+	 * Create the top ACPI proc directory
+	 */
+	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
+
+	result = bus_register(&acpi_bus_type);
+	if (!result)
+		return 0;
+
+	/* Mimic structured exception handling */
+      error1:
+	acpi_terminate();
+	return -ENODEV;
+}
+
+struct kobject *acpi_kobj;
+EXPORT_SYMBOL_GPL(acpi_kobj);
+
+void __weak __init acpi_arch_init(void) { }
+
+static int __init acpi_init(void)
+{
+	int result;
+
+	if (acpi_disabled) {
+		pr_info("Interpreter disabled.\n");
+		return -ENODEV;
+	}
+
+	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
+	if (!acpi_kobj) {
+		pr_err("Failed to register kobject\n");
+		return -ENOMEM;
+	}
+
+	init_prmt();
+	acpi_init_pcc();
+	result = acpi_bus_init();
+	if (result) {
+		kobject_put(acpi_kobj);
+		disable_acpi();
+		return result;
+	}
+	acpi_init_ffh();
+
+	pci_mmcfg_late_init();
+	acpi_viot_early_init();
+	acpi_hest_init();
+	acpi_ghes_init();
+	acpi_arch_init();
+	acpi_scan_init();
+	acpi_ec_init();
+	acpi_debugfs_init();
+	acpi_sleep_proc_init();
+	acpi_wakeup_device_init();
+	acpi_debugger_init();
+	acpi_setup_sb_notify_handler();
+	acpi_viot_init();
+	return 0;
+}
+
+subsys_initcall(acpi_init);