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linux/drivers/acpi/bus.c
Linus Torvalds 36808d5e98 Merge tag 'driver-core-7.2-rc1' of gitolite.kernel.org:pub/scm/linux/kernel/git/driver-core/driver-core 
Pull driver core updates from Danilo Krummrich:
 "Deferred probe:
   - Fix race where deferred probe timeout work could be permanently
     canceled by using mod_delayed_work()
   - Fix missing jiffies conversion in deferred_probe_extend_timeout()
   - Guard timeout extension with delayed_work_pending() to prevent
     premature firing
   - Use system_percpu_wq instead of the deprecated system_wq
   - Update deferred_probe_timeout documentation

  device:
   - Replace direct struct device bitfield access (can_match, dma_iommu,
     dma_skip_sync, dma_ops_bypass, state_synced, dma_coherent,
     of_node_reused, offline, offline_disabled) with flag-based
     accessors using bit operations
   - Reject devices with unregistered buses
   - Delete unused DEVICE_ATTR_PREALLOC()
   - Add low-level device attribute macros with const show/store
     callbacks, allowing device attributes to reside in read-only memory
   - Move core device attributes to read-only memory
   - Constify group array pointers in driver_add_groups() /
     driver_remove_groups(), struct bus_type, and struct device_driver

  device property:
   - Fix fwnode reference leak in fwnode_graph_get_endpoint_by_id()
   - Initialize all fields of fwnode_handle in fwnode_init()
   - Provide swnode_get()/swnode_put() wrappers around kobject_get/put()
   - Allow passing struct software_node_ref_args pointers directly to
     PROPERTY_ENTRY_REF()

  driver_override:
   - Migrate amba, cdx, vmbus, and rpmsg to the generic driver_override
     infrastructure, fixing a UAF from unsynchronized access to
     driver_override in bus match() callbacks
   - Remove the now-unused driver_set_override()

  firmware loader:
   - Fix recursive lock deadlock in device_cache_fw_images() when async
     work falls back to synchronous execution
   - Fix device reference leak in firmware_upload_register()

  platform:
   - Pass KBUILD_MODNAME through the platform driver registration macro
     to create module symlinks in sysfs for built-in drivers; move
     module_kset initialization to a pure_initcall and tegra cbb
     registration to core_initcall to ensure correct ordering
   - Pass THIS_MODULE implicitly through a coresight_init_driver() macro

  sysfs:
   - Upgrade OOB write detection in sysfs_kf_seq_show() from printk to
     WARN
   - Add return value clamping to sysfs_kf_read()

  Rust:
   - ACPI:

     Fix missing match data for PRP0001 by exporting
     acpi_of_match_device()

   - Auxiliary:

     Replace drvdata() with dedicated registration data on
     auxiliary_device. drvdata() exposed the driver's bus device private
     data beyond the driver's own scope, creating ordering constraints
     and forcing the data to outlive all registrations that access it.
     Registration data is instead scoped structurally to the
     Registration object, making lifecycle ordering enforced by
     construction rather than convention.

   - Rust-native device driver lifetimes (HRT):

     Allow Rust device drivers to carry a lifetime parameter on their
     bus device private data, tied to the device binding scope -- the
     interval during which a bus device is bound to a driver. Device
     resources like pci::Bar<'a> and IoMem<'a> can be stored directly in
     the driver's bus device private data with a lifetime bounded by the
     binding scope, so the compiler enforces at build time that they do
     not outlive the binding. This removes Devres indirection from every
     access site and eliminates try_access() failure paths in
     destructors.

     Bus driver traits use a Generic Associated Type (GAT) Data<'bound>
     to introduce the lifetime on the private data, rather than
     parameterizing the Driver trait itself. Auxiliary registration
     data, where the lifetime is not introduced by a trait callback but
     must be threaded through Registration, uses the ForLt trait (a
     type-level abstraction for types generic over a lifetime).

  Misc:
   - Fix DT overlayed devices not probing by reverting the broken
     treewide overlay fix and re-running fw_devlink consumer pickup when
     an overlay is applied to a bound device
   - Use root_device_register() for faux bus root device; add sanity
     check for failed bus init
   - Fix dev_has_sync_state() data race with READ_ONCE() and move it to
     base.h
   - Avoid spurious device_links warning when removing a device while
     its supplier is unbinding
   - Switch ISA bus to dynamic root device
   - Fix suspicious RCU usage in kernfs_put()
   - Remove devcoredump exit callback
   - Constify devfreq_event_class"

* tag 'driver-core-7.2-rc1' of gitolite.kernel.org:pub/scm/linux/kernel/git/driver-core/driver-core: (81 commits)
  software node: allow passing reference args to PROPERTY_ENTRY_REF()
  driver core: platform: set mod_name in driver registration
  coresight: pass THIS_MODULE implicitly through a macro
  kernel: param: initialize module_kset in a pure_initcall
  soc/tegra: cbb: Move driver registration from pure_initcall to core_initcall
  firmware_loader: Fix recursive lock in device_cache_fw_images()
  driver core: Use system_percpu_wq instead of system_wq
  driver core: remove driver_set_override()
  rpmsg: use generic driver_override infrastructure
  Drivers: hv: vmbus: use generic driver_override infrastructure
  cdx: use generic driver_override infrastructure
  amba: use generic driver_override infrastructure
  rust: devres: add 'static bound to Devres<T>
  samples: rust: rust_driver_auxiliary: showcase lifetime-bound registration data
  rust: auxiliary: generalize Registration over ForLt
  rust: types: add `ForLt` trait for higher-ranked lifetime support
  gpu: nova-core: separate driver type from driver data
  samples: rust: rust_driver_pci: use HRT lifetime for Bar
  rust: io: make IoMem and ExclusiveIoMem lifetime-parameterized
  rust: pci: make Bar lifetime-parameterized
  ...
2026-06-15 12:41:17 +05:30

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// 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;
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; i < bufsize; i++)
capbuf[i] &= retbuf[i];
if (retbuf[OSC_QUERY_DWORD] & OSC_ERROR_MASK) {
/*
* 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);
}
static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
{
struct acpi_device *device = data;
struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
acpi_drv->ops.notify(device, event);
}
static int acpi_device_install_notify_handler(struct acpi_device *device,
struct acpi_driver *acpi_drv)
{
u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
acpi_status status;
status = acpi_install_notify_handler(device->handle, type,
acpi_notify_device, device);
if (ACPI_FAILURE(status))
return -EINVAL;
return 0;
}
static void acpi_device_remove_notify_handler(struct acpi_device *device,
struct acpi_driver *acpi_drv)
{
u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
acpi_remove_notify_handler(device->handle, type,
acpi_notify_device);
acpi_os_wait_events_complete();
}
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
-------------------------------------------------------------------------- */
/**
* 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)
{
struct mutex *physical_node_lock = &adev->physical_node_lock;
struct device *phys_dev;
mutex_lock(physical_node_lock);
if (list_empty(&adev->physical_node_list)) {
phys_dev = NULL;
} else {
const struct acpi_device_physical_node *node;
node = list_first_entry(&adev->physical_node_list,
struct acpi_device_physical_node, node);
phys_dev = node->dev;
}
mutex_unlock(physical_node_lock);
return phys_dev;
}
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.
*/
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 Driver Management
-------------------------------------------------------------------------- */
/**
* __acpi_bus_register_driver - register a driver with the ACPI bus
* @driver: driver being registered
* @owner: owning module/driver
*
* 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, struct module *owner)
{
if (acpi_disabled)
return -ENODEV;
driver->drv.name = driver->name;
driver->drv.bus = &acpi_bus_type;
driver->drv.owner = owner;
return driver_register(&driver->drv);
}
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, const struct device_driver *drv)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
const 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(const 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) {
acpi_dev->driver_data = NULL;
return ret;
}
pr_debug("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, acpi_drv);
if (ret) {
if (acpi_drv->ops.remove)
acpi_drv->ops.remove(acpi_dev);
acpi_dev->driver_data = NULL;
return ret;
}
}
pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
acpi_dev->pnp.bus_id);
get_device(dev);
return 0;
}
static void acpi_device_remove(struct device *dev)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
if (acpi_drv->ops.notify)
acpi_device_remove_notify_handler(acpi_dev, acpi_drv);
if (acpi_drv->ops.remove)
acpi_drv->ops.remove(acpi_dev);
acpi_dev->driver_data = NULL;
put_device(dev);
}
const struct bus_type acpi_bus_type = {
.name = "acpi",
.match = acpi_bus_match,
.probe = acpi_device_probe,
.remove = acpi_device_remove,
.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);
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);
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