linux/drivers/acpi/scan.c
Rafael J. Wysocki 4ed63b31dc Merge branches 'acpi-ec', 'acpi-sysfs', 'acpi-utils' and 'acpi-soc'
Merge an ACPI EC driver update, ACPI sysfs interface updates, an ACPI
library function update, and an ACPI APD driver update for 6.12-rc1:

 - Do not release locks during operation region accesses in the ACPI EC
   driver (Rafael Wysocki).

 - Fix up the _STR handling in the ACPI device object sysfs interface,
   make it represent the device object attributes as an attribute group
   and make it rely on driver core functionality for sysfs attrubute
   management (Thomas Weißschuh).

 - Extend error messages printed to the kernel log when acpi_evaluate_dsm()
   fails to include revision and function number (David Wang).

 - Add a new AMDI0015 platform device ID to the ACPi APD driver for AMD
   SoCs (Shyam Sundar S K).

* acpi-ec:
  ACPI: EC: Do not release locks during operation region accesses

* acpi-sysfs:
  ACPI: sysfs: remove return value of acpi_device_setup_files()
  ACPI: sysfs: manage sysfs attributes through device core
  ACPI: sysfs: manage attributes as attribute_group
  ACPI: sysfs: evaluate _STR on each sysfs access
  ACPI: sysfs: validate return type of _STR method

* acpi-utils:
  ACPI: utils: Add rev/func to message when acpi_evaluate_dsm() fails

* acpi-soc:
  ACPI: APD: Add AMDI0015 as platform device
2024-09-11 21:45:36 +02:00

2843 lines
71 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* scan.c - support for transforming the ACPI namespace into individual objects
*/
#define pr_fmt(fmt) "ACPI: " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/acpi_iort.h>
#include <linux/acpi_viot.h>
#include <linux/iommu.h>
#include <linux/signal.h>
#include <linux/kthread.h>
#include <linux/dmi.h>
#include <linux/dma-map-ops.h>
#include <linux/platform_data/x86/apple.h>
#include <linux/pgtable.h>
#include <linux/crc32.h>
#include <linux/dma-direct.h>
#include "internal.h"
#include "sleep.h"
#define ACPI_BUS_CLASS "system_bus"
#define ACPI_BUS_HID "LNXSYBUS"
#define ACPI_BUS_DEVICE_NAME "System Bus"
#define INVALID_ACPI_HANDLE ((acpi_handle)ZERO_PAGE(0))
static const char *dummy_hid = "device";
static LIST_HEAD(acpi_dep_list);
static DEFINE_MUTEX(acpi_dep_list_lock);
LIST_HEAD(acpi_bus_id_list);
static DEFINE_MUTEX(acpi_scan_lock);
static LIST_HEAD(acpi_scan_handlers_list);
DEFINE_MUTEX(acpi_device_lock);
LIST_HEAD(acpi_wakeup_device_list);
static DEFINE_MUTEX(acpi_hp_context_lock);
/*
* The UART device described by the SPCR table is the only object which needs
* special-casing. Everything else is covered by ACPI namespace paths in STAO
* table.
*/
static u64 spcr_uart_addr;
void acpi_scan_lock_acquire(void)
{
mutex_lock(&acpi_scan_lock);
}
EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
void acpi_scan_lock_release(void)
{
mutex_unlock(&acpi_scan_lock);
}
EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
void acpi_lock_hp_context(void)
{
mutex_lock(&acpi_hp_context_lock);
}
void acpi_unlock_hp_context(void)
{
mutex_unlock(&acpi_hp_context_lock);
}
void acpi_initialize_hp_context(struct acpi_device *adev,
struct acpi_hotplug_context *hp,
acpi_hp_notify notify, acpi_hp_uevent uevent)
{
acpi_lock_hp_context();
hp->notify = notify;
hp->uevent = uevent;
acpi_set_hp_context(adev, hp);
acpi_unlock_hp_context();
}
EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
int acpi_scan_add_handler(struct acpi_scan_handler *handler)
{
if (!handler)
return -EINVAL;
list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
return 0;
}
int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
const char *hotplug_profile_name)
{
int error;
error = acpi_scan_add_handler(handler);
if (error)
return error;
acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
return 0;
}
bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
{
struct acpi_device_physical_node *pn;
bool offline = true;
char *envp[] = { "EVENT=offline", NULL };
/*
* acpi_container_offline() calls this for all of the container's
* children under the container's physical_node_lock lock.
*/
mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
list_for_each_entry(pn, &adev->physical_node_list, node)
if (device_supports_offline(pn->dev) && !pn->dev->offline) {
if (uevent)
kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
offline = false;
break;
}
mutex_unlock(&adev->physical_node_lock);
return offline;
}
static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
void **ret_p)
{
struct acpi_device *device = acpi_fetch_acpi_dev(handle);
struct acpi_device_physical_node *pn;
bool second_pass = (bool)data;
acpi_status status = AE_OK;
if (!device)
return AE_OK;
if (device->handler && !device->handler->hotplug.enabled) {
*ret_p = &device->dev;
return AE_SUPPORT;
}
mutex_lock(&device->physical_node_lock);
list_for_each_entry(pn, &device->physical_node_list, node) {
int ret;
if (second_pass) {
/* Skip devices offlined by the first pass. */
if (pn->put_online)
continue;
} else {
pn->put_online = false;
}
ret = device_offline(pn->dev);
if (ret >= 0) {
pn->put_online = !ret;
} else {
*ret_p = pn->dev;
if (second_pass) {
status = AE_ERROR;
break;
}
}
}
mutex_unlock(&device->physical_node_lock);
return status;
}
static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
void **ret_p)
{
struct acpi_device *device = acpi_fetch_acpi_dev(handle);
struct acpi_device_physical_node *pn;
if (!device)
return AE_OK;
mutex_lock(&device->physical_node_lock);
list_for_each_entry(pn, &device->physical_node_list, node)
if (pn->put_online) {
device_online(pn->dev);
pn->put_online = false;
}
mutex_unlock(&device->physical_node_lock);
return AE_OK;
}
static int acpi_scan_try_to_offline(struct acpi_device *device)
{
acpi_handle handle = device->handle;
struct device *errdev = NULL;
acpi_status status;
/*
* Carry out two passes here and ignore errors in the first pass,
* because if the devices in question are memory blocks and
* CONFIG_MEMCG is set, one of the blocks may hold data structures
* that the other blocks depend on, but it is not known in advance which
* block holds them.
*
* If the first pass is successful, the second one isn't needed, though.
*/
status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
NULL, acpi_bus_offline, (void *)false,
(void **)&errdev);
if (status == AE_SUPPORT) {
dev_warn(errdev, "Offline disabled.\n");
acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
acpi_bus_online, NULL, NULL, NULL);
return -EPERM;
}
acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
if (errdev) {
errdev = NULL;
acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
NULL, acpi_bus_offline, (void *)true,
(void **)&errdev);
if (!errdev)
acpi_bus_offline(handle, 0, (void *)true,
(void **)&errdev);
if (errdev) {
dev_warn(errdev, "Offline failed.\n");
acpi_bus_online(handle, 0, NULL, NULL);
acpi_walk_namespace(ACPI_TYPE_ANY, handle,
ACPI_UINT32_MAX, acpi_bus_online,
NULL, NULL, NULL);
return -EBUSY;
}
}
return 0;
}
#define ACPI_SCAN_CHECK_FLAG_STATUS BIT(0)
#define ACPI_SCAN_CHECK_FLAG_EJECT BIT(1)
static int acpi_scan_check_and_detach(struct acpi_device *adev, void *p)
{
struct acpi_scan_handler *handler = adev->handler;
uintptr_t flags = (uintptr_t)p;
acpi_dev_for_each_child_reverse(adev, acpi_scan_check_and_detach, p);
if (flags & ACPI_SCAN_CHECK_FLAG_STATUS) {
acpi_bus_get_status(adev);
/*
* Skip devices that are still there and take the enabled
* flag into account.
*/
if (acpi_device_is_enabled(adev))
return 0;
/* Skip device that have not been enumerated. */
if (!acpi_device_enumerated(adev)) {
dev_dbg(&adev->dev, "Still not enumerated\n");
return 0;
}
}
adev->flags.match_driver = false;
if (handler) {
if (handler->detach)
handler->detach(adev);
} else {
device_release_driver(&adev->dev);
}
/*
* Most likely, the device is going away, so put it into D3cold before
* that.
*/
acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
adev->flags.initialized = false;
/* For eject this is deferred to acpi_bus_post_eject() */
if (!(flags & ACPI_SCAN_CHECK_FLAG_EJECT)) {
adev->handler = NULL;
acpi_device_clear_enumerated(adev);
}
return 0;
}
static int acpi_bus_post_eject(struct acpi_device *adev, void *not_used)
{
struct acpi_scan_handler *handler = adev->handler;
acpi_dev_for_each_child_reverse(adev, acpi_bus_post_eject, NULL);
if (handler) {
if (handler->post_eject)
handler->post_eject(adev);
adev->handler = NULL;
}
acpi_device_clear_enumerated(adev);
return 0;
}
static void acpi_scan_check_subtree(struct acpi_device *adev)
{
uintptr_t flags = ACPI_SCAN_CHECK_FLAG_STATUS;
acpi_scan_check_and_detach(adev, (void *)flags);
}
static int acpi_scan_hot_remove(struct acpi_device *device)
{
acpi_handle handle = device->handle;
unsigned long long sta;
acpi_status status;
uintptr_t flags = ACPI_SCAN_CHECK_FLAG_EJECT;
if (device->handler && device->handler->hotplug.demand_offline) {
if (!acpi_scan_is_offline(device, true))
return -EBUSY;
} else {
int error = acpi_scan_try_to_offline(device);
if (error)
return error;
}
acpi_handle_debug(handle, "Ejecting\n");
acpi_scan_check_and_detach(device, (void *)flags);
acpi_evaluate_lck(handle, 0);
/*
* TBD: _EJD support.
*/
status = acpi_evaluate_ej0(handle);
if (status == AE_NOT_FOUND)
return -ENODEV;
else if (ACPI_FAILURE(status))
return -EIO;
/*
* Verify if eject was indeed successful. If not, log an error
* message. No need to call _OST since _EJ0 call was made OK.
*/
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
if (ACPI_FAILURE(status)) {
acpi_handle_warn(handle,
"Status check after eject failed (0x%x)\n", status);
} else if (sta & ACPI_STA_DEVICE_ENABLED) {
acpi_handle_warn(handle,
"Eject incomplete - status 0x%llx\n", sta);
} else {
acpi_bus_post_eject(device, NULL);
}
return 0;
}
static int acpi_scan_rescan_bus(struct acpi_device *adev)
{
struct acpi_scan_handler *handler = adev->handler;
int ret;
if (handler && handler->hotplug.scan_dependent)
ret = handler->hotplug.scan_dependent(adev);
else
ret = acpi_bus_scan(adev->handle);
if (ret)
dev_info(&adev->dev, "Namespace scan failure\n");
return ret;
}
static int acpi_scan_device_check(struct acpi_device *adev)
{
struct acpi_device *parent;
acpi_scan_check_subtree(adev);
if (!acpi_device_is_present(adev))
return 0;
/*
* This function is only called for device objects for which matching
* scan handlers exist. The only situation in which the scan handler
* is not attached to this device object yet is when the device has
* just appeared (either it wasn't present at all before or it was
* removed and then added again).
*/
if (adev->handler) {
dev_dbg(&adev->dev, "Already enumerated\n");
return 0;
}
parent = acpi_dev_parent(adev);
if (!parent)
parent = adev;
return acpi_scan_rescan_bus(parent);
}
static int acpi_scan_bus_check(struct acpi_device *adev)
{
acpi_scan_check_subtree(adev);
return acpi_scan_rescan_bus(adev);
}
static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
{
switch (type) {
case ACPI_NOTIFY_BUS_CHECK:
return acpi_scan_bus_check(adev);
case ACPI_NOTIFY_DEVICE_CHECK:
return acpi_scan_device_check(adev);
case ACPI_NOTIFY_EJECT_REQUEST:
case ACPI_OST_EC_OSPM_EJECT:
if (adev->handler && !adev->handler->hotplug.enabled) {
dev_info(&adev->dev, "Eject disabled\n");
return -EPERM;
}
acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
return acpi_scan_hot_remove(adev);
}
return -EINVAL;
}
void acpi_device_hotplug(struct acpi_device *adev, u32 src)
{
u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
int error = -ENODEV;
lock_device_hotplug();
mutex_lock(&acpi_scan_lock);
/*
* The device object's ACPI handle cannot become invalid as long as we
* are holding acpi_scan_lock, but it might have become invalid before
* that lock was acquired.
*/
if (adev->handle == INVALID_ACPI_HANDLE)
goto err_out;
if (adev->flags.is_dock_station) {
error = dock_notify(adev, src);
} else if (adev->flags.hotplug_notify) {
error = acpi_generic_hotplug_event(adev, src);
} else {
acpi_hp_notify notify;
acpi_lock_hp_context();
notify = adev->hp ? adev->hp->notify : NULL;
acpi_unlock_hp_context();
/*
* There may be additional notify handlers for device objects
* without the .event() callback, so ignore them here.
*/
if (notify)
error = notify(adev, src);
else
goto out;
}
switch (error) {
case 0:
ost_code = ACPI_OST_SC_SUCCESS;
break;
case -EPERM:
ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
break;
case -EBUSY:
ost_code = ACPI_OST_SC_DEVICE_BUSY;
break;
default:
ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
break;
}
err_out:
acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
out:
acpi_put_acpi_dev(adev);
mutex_unlock(&acpi_scan_lock);
unlock_device_hotplug();
}
static void acpi_free_power_resources_lists(struct acpi_device *device)
{
int i;
if (device->wakeup.flags.valid)
acpi_power_resources_list_free(&device->wakeup.resources);
if (!device->power.flags.power_resources)
return;
for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
struct acpi_device_power_state *ps = &device->power.states[i];
acpi_power_resources_list_free(&ps->resources);
}
}
static void acpi_device_release(struct device *dev)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
acpi_free_properties(acpi_dev);
acpi_free_pnp_ids(&acpi_dev->pnp);
acpi_free_power_resources_lists(acpi_dev);
kfree(acpi_dev);
}
static void acpi_device_del(struct acpi_device *device)
{
struct acpi_device_bus_id *acpi_device_bus_id;
mutex_lock(&acpi_device_lock);
list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
if (!strcmp(acpi_device_bus_id->bus_id,
acpi_device_hid(device))) {
ida_free(&acpi_device_bus_id->instance_ida,
device->pnp.instance_no);
if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
list_del(&acpi_device_bus_id->node);
kfree_const(acpi_device_bus_id->bus_id);
kfree(acpi_device_bus_id);
}
break;
}
list_del(&device->wakeup_list);
mutex_unlock(&acpi_device_lock);
acpi_power_add_remove_device(device, false);
acpi_device_remove_files(device);
if (device->remove)
device->remove(device);
device_del(&device->dev);
}
static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
static LIST_HEAD(acpi_device_del_list);
static DEFINE_MUTEX(acpi_device_del_lock);
static void acpi_device_del_work_fn(struct work_struct *work_not_used)
{
for (;;) {
struct acpi_device *adev;
mutex_lock(&acpi_device_del_lock);
if (list_empty(&acpi_device_del_list)) {
mutex_unlock(&acpi_device_del_lock);
break;
}
adev = list_first_entry(&acpi_device_del_list,
struct acpi_device, del_list);
list_del(&adev->del_list);
mutex_unlock(&acpi_device_del_lock);
blocking_notifier_call_chain(&acpi_reconfig_chain,
ACPI_RECONFIG_DEVICE_REMOVE, adev);
acpi_device_del(adev);
/*
* Drop references to all power resources that might have been
* used by the device.
*/
acpi_power_transition(adev, ACPI_STATE_D3_COLD);
acpi_dev_put(adev);
}
}
/**
* acpi_scan_drop_device - Drop an ACPI device object.
* @handle: Handle of an ACPI namespace node, not used.
* @context: Address of the ACPI device object to drop.
*
* This is invoked by acpi_ns_delete_node() during the removal of the ACPI
* namespace node the device object pointed to by @context is attached to.
*
* The unregistration is carried out asynchronously to avoid running
* acpi_device_del() under the ACPICA's namespace mutex and the list is used to
* ensure the correct ordering (the device objects must be unregistered in the
* same order in which the corresponding namespace nodes are deleted).
*/
static void acpi_scan_drop_device(acpi_handle handle, void *context)
{
static DECLARE_WORK(work, acpi_device_del_work_fn);
struct acpi_device *adev = context;
mutex_lock(&acpi_device_del_lock);
/*
* Use the ACPI hotplug workqueue which is ordered, so this work item
* won't run after any hotplug work items submitted subsequently. That
* prevents attempts to register device objects identical to those being
* deleted from happening concurrently (such attempts result from
* hotplug events handled via the ACPI hotplug workqueue). It also will
* run after all of the work items submitted previously, which helps
* those work items to ensure that they are not accessing stale device
* objects.
*/
if (list_empty(&acpi_device_del_list))
acpi_queue_hotplug_work(&work);
list_add_tail(&adev->del_list, &acpi_device_del_list);
/* Make acpi_ns_validate_handle() return NULL for this handle. */
adev->handle = INVALID_ACPI_HANDLE;
mutex_unlock(&acpi_device_del_lock);
}
static struct acpi_device *handle_to_device(acpi_handle handle,
void (*callback)(void *))
{
struct acpi_device *adev = NULL;
acpi_status status;
status = acpi_get_data_full(handle, acpi_scan_drop_device,
(void **)&adev, callback);
if (ACPI_FAILURE(status) || !adev) {
acpi_handle_debug(handle, "No context!\n");
return NULL;
}
return adev;
}
/**
* acpi_fetch_acpi_dev - Retrieve ACPI device object.
* @handle: ACPI handle associated with the requested ACPI device object.
*
* Return a pointer to the ACPI device object associated with @handle, if
* present, or NULL otherwise.
*/
struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle)
{
return handle_to_device(handle, NULL);
}
EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev);
static void get_acpi_device(void *dev)
{
acpi_dev_get(dev);
}
/**
* acpi_get_acpi_dev - Retrieve ACPI device object and reference count it.
* @handle: ACPI handle associated with the requested ACPI device object.
*
* Return a pointer to the ACPI device object associated with @handle and bump
* up that object's reference counter (under the ACPI Namespace lock), if
* present, or return NULL otherwise.
*
* The ACPI device object reference acquired by this function needs to be
* dropped via acpi_dev_put().
*/
struct acpi_device *acpi_get_acpi_dev(acpi_handle handle)
{
return handle_to_device(handle, get_acpi_device);
}
EXPORT_SYMBOL_GPL(acpi_get_acpi_dev);
static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
{
struct acpi_device_bus_id *acpi_device_bus_id;
/* Find suitable bus_id and instance number in acpi_bus_id_list. */
list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
return acpi_device_bus_id;
}
return NULL;
}
static int acpi_device_set_name(struct acpi_device *device,
struct acpi_device_bus_id *acpi_device_bus_id)
{
struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
int result;
result = ida_alloc(instance_ida, GFP_KERNEL);
if (result < 0)
return result;
device->pnp.instance_no = result;
dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
return 0;
}
int acpi_tie_acpi_dev(struct acpi_device *adev)
{
acpi_handle handle = adev->handle;
acpi_status status;
if (!handle)
return 0;
status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
if (ACPI_FAILURE(status)) {
acpi_handle_err(handle, "Unable to attach device data\n");
return -ENODEV;
}
return 0;
}
static void acpi_store_pld_crc(struct acpi_device *adev)
{
struct acpi_pld_info *pld;
acpi_status status;
status = acpi_get_physical_device_location(adev->handle, &pld);
if (ACPI_FAILURE(status))
return;
adev->pld_crc = crc32(~0, pld, sizeof(*pld));
ACPI_FREE(pld);
}
int acpi_device_add(struct acpi_device *device)
{
struct acpi_device_bus_id *acpi_device_bus_id;
int result;
/*
* Linkage
* -------
* Link this device to its parent and siblings.
*/
INIT_LIST_HEAD(&device->wakeup_list);
INIT_LIST_HEAD(&device->physical_node_list);
INIT_LIST_HEAD(&device->del_list);
mutex_init(&device->physical_node_lock);
mutex_lock(&acpi_device_lock);
acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
if (acpi_device_bus_id) {
result = acpi_device_set_name(device, acpi_device_bus_id);
if (result)
goto err_unlock;
} else {
acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
GFP_KERNEL);
if (!acpi_device_bus_id) {
result = -ENOMEM;
goto err_unlock;
}
acpi_device_bus_id->bus_id =
kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
if (!acpi_device_bus_id->bus_id) {
kfree(acpi_device_bus_id);
result = -ENOMEM;
goto err_unlock;
}
ida_init(&acpi_device_bus_id->instance_ida);
result = acpi_device_set_name(device, acpi_device_bus_id);
if (result) {
kfree_const(acpi_device_bus_id->bus_id);
kfree(acpi_device_bus_id);
goto err_unlock;
}
list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
}
if (device->wakeup.flags.valid)
list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
acpi_store_pld_crc(device);
mutex_unlock(&acpi_device_lock);
result = device_add(&device->dev);
if (result) {
dev_err(&device->dev, "Error registering device\n");
goto err;
}
acpi_device_setup_files(device);
return 0;
err:
mutex_lock(&acpi_device_lock);
list_del(&device->wakeup_list);
err_unlock:
mutex_unlock(&acpi_device_lock);
acpi_detach_data(device->handle, acpi_scan_drop_device);
return result;
}
/* --------------------------------------------------------------------------
Device Enumeration
-------------------------------------------------------------------------- */
static bool acpi_info_matches_ids(struct acpi_device_info *info,
const char * const ids[])
{
struct acpi_pnp_device_id_list *cid_list = NULL;
int i, index;
if (!(info->valid & ACPI_VALID_HID))
return false;
index = match_string(ids, -1, info->hardware_id.string);
if (index >= 0)
return true;
if (info->valid & ACPI_VALID_CID)
cid_list = &info->compatible_id_list;
if (!cid_list)
return false;
for (i = 0; i < cid_list->count; i++) {
index = match_string(ids, -1, cid_list->ids[i].string);
if (index >= 0)
return true;
}
return false;
}
/* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
static const char * const acpi_ignore_dep_ids[] = {
"PNP0D80", /* Windows-compatible System Power Management Controller */
"INT33BD", /* Intel Baytrail Mailbox Device */
"LATT2021", /* Lattice FW Update Client Driver */
NULL
};
/* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */
static const char * const acpi_honor_dep_ids[] = {
"INT3472", /* Camera sensor PMIC / clk and regulator info */
"INTC1059", /* IVSC (TGL) driver must be loaded to allow i2c access to camera sensors */
"INTC1095", /* IVSC (ADL) driver must be loaded to allow i2c access to camera sensors */
"INTC100A", /* IVSC (RPL) driver must be loaded to allow i2c access to camera sensors */
"INTC10CF", /* IVSC (MTL) driver must be loaded to allow i2c access to camera sensors */
"RSCV0001", /* RISC-V PLIC */
"RSCV0002", /* RISC-V APLIC */
"PNP0C0F", /* PCI Link Device */
NULL
};
static struct acpi_device *acpi_find_parent_acpi_dev(acpi_handle handle)
{
struct acpi_device *adev;
/*
* Fixed hardware devices do not appear in the namespace and do not
* have handles, but we fabricate acpi_devices for them, so we have
* to deal with them specially.
*/
if (!handle)
return acpi_root;
do {
acpi_status status;
status = acpi_get_parent(handle, &handle);
if (ACPI_FAILURE(status)) {
if (status != AE_NULL_ENTRY)
return acpi_root;
return NULL;
}
adev = acpi_fetch_acpi_dev(handle);
} while (!adev);
return adev;
}
acpi_status
acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
{
acpi_status status;
acpi_handle tmp;
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
union acpi_object *obj;
status = acpi_get_handle(handle, "_EJD", &tmp);
if (ACPI_FAILURE(status))
return status;
status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
if (ACPI_SUCCESS(status)) {
obj = buffer.pointer;
status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
ejd);
kfree(buffer.pointer);
}
return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
{
acpi_handle handle = dev->handle;
struct acpi_device_wakeup *wakeup = &dev->wakeup;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *package = NULL;
union acpi_object *element = NULL;
acpi_status status;
int err = -ENODATA;
INIT_LIST_HEAD(&wakeup->resources);
/* _PRW */
status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
if (ACPI_FAILURE(status)) {
acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
acpi_format_exception(status));
return err;
}
package = (union acpi_object *)buffer.pointer;
if (!package || package->package.count < 2)
goto out;
element = &(package->package.elements[0]);
if (!element)
goto out;
if (element->type == ACPI_TYPE_PACKAGE) {
if ((element->package.count < 2) ||
(element->package.elements[0].type !=
ACPI_TYPE_LOCAL_REFERENCE)
|| (element->package.elements[1].type != ACPI_TYPE_INTEGER))
goto out;
wakeup->gpe_device =
element->package.elements[0].reference.handle;
wakeup->gpe_number =
(u32) element->package.elements[1].integer.value;
} else if (element->type == ACPI_TYPE_INTEGER) {
wakeup->gpe_device = NULL;
wakeup->gpe_number = element->integer.value;
} else {
goto out;
}
element = &(package->package.elements[1]);
if (element->type != ACPI_TYPE_INTEGER)
goto out;
wakeup->sleep_state = element->integer.value;
err = acpi_extract_power_resources(package, 2, &wakeup->resources);
if (err)
goto out;
if (!list_empty(&wakeup->resources)) {
int sleep_state;
err = acpi_power_wakeup_list_init(&wakeup->resources,
&sleep_state);
if (err) {
acpi_handle_warn(handle, "Retrieving current states "
"of wakeup power resources failed\n");
acpi_power_resources_list_free(&wakeup->resources);
goto out;
}
if (sleep_state < wakeup->sleep_state) {
acpi_handle_warn(handle, "Overriding _PRW sleep state "
"(S%d) by S%d from power resources\n",
(int)wakeup->sleep_state, sleep_state);
wakeup->sleep_state = sleep_state;
}
}
out:
kfree(buffer.pointer);
return err;
}
/* Do not use a button for S5 wakeup */
#define ACPI_AVOID_WAKE_FROM_S5 BIT(0)
static bool acpi_wakeup_gpe_init(struct acpi_device *device)
{
static const struct acpi_device_id button_device_ids[] = {
{"PNP0C0C", 0}, /* Power button */
{"PNP0C0D", ACPI_AVOID_WAKE_FROM_S5}, /* Lid */
{"PNP0C0E", ACPI_AVOID_WAKE_FROM_S5}, /* Sleep button */
{"", 0},
};
struct acpi_device_wakeup *wakeup = &device->wakeup;
const struct acpi_device_id *match;
acpi_status status;
wakeup->flags.notifier_present = 0;
/* Power button, Lid switch always enable wakeup */
match = acpi_match_acpi_device(button_device_ids, device);
if (match) {
if ((match->driver_data & ACPI_AVOID_WAKE_FROM_S5) &&
wakeup->sleep_state == ACPI_STATE_S5)
wakeup->sleep_state = ACPI_STATE_S4;
acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
device_set_wakeup_capable(&device->dev, true);
return true;
}
status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
wakeup->gpe_number);
return ACPI_SUCCESS(status);
}
static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
{
int err;
/* Presence of _PRW indicates wake capable */
if (!acpi_has_method(device->handle, "_PRW"))
return;
err = acpi_bus_extract_wakeup_device_power_package(device);
if (err) {
dev_err(&device->dev, "Unable to extract wakeup power resources");
return;
}
device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
device->wakeup.prepare_count = 0;
/*
* Call _PSW/_DSW object to disable its ability to wake the sleeping
* system for the ACPI device with the _PRW object.
* The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
* So it is necessary to call _DSW object first. Only when it is not
* present will the _PSW object used.
*/
err = acpi_device_sleep_wake(device, 0, 0, 0);
if (err)
pr_debug("error in _DSW or _PSW evaluation\n");
}
static void acpi_bus_init_power_state(struct acpi_device *device, int state)
{
struct acpi_device_power_state *ps = &device->power.states[state];
char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
INIT_LIST_HEAD(&ps->resources);
/* Evaluate "_PRx" to get referenced power resources */
status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
if (ACPI_SUCCESS(status)) {
union acpi_object *package = buffer.pointer;
if (buffer.length && package
&& package->type == ACPI_TYPE_PACKAGE
&& package->package.count)
acpi_extract_power_resources(package, 0, &ps->resources);
ACPI_FREE(buffer.pointer);
}
/* Evaluate "_PSx" to see if we can do explicit sets */
pathname[2] = 'S';
if (acpi_has_method(device->handle, pathname))
ps->flags.explicit_set = 1;
/* State is valid if there are means to put the device into it. */
if (!list_empty(&ps->resources) || ps->flags.explicit_set)
ps->flags.valid = 1;
ps->power = -1; /* Unknown - driver assigned */
ps->latency = -1; /* Unknown - driver assigned */
}
static void acpi_bus_get_power_flags(struct acpi_device *device)
{
unsigned long long dsc = ACPI_STATE_D0;
u32 i;
/* Presence of _PS0|_PR0 indicates 'power manageable' */
if (!acpi_has_method(device->handle, "_PS0") &&
!acpi_has_method(device->handle, "_PR0"))
return;
device->flags.power_manageable = 1;
/*
* Power Management Flags
*/
if (acpi_has_method(device->handle, "_PSC"))
device->power.flags.explicit_get = 1;
if (acpi_has_method(device->handle, "_IRC"))
device->power.flags.inrush_current = 1;
if (acpi_has_method(device->handle, "_DSW"))
device->power.flags.dsw_present = 1;
acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc);
device->power.state_for_enumeration = dsc;
/*
* Enumerate supported power management states
*/
for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
acpi_bus_init_power_state(device, i);
INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
/* Set the defaults for D0 and D3hot (always supported). */
device->power.states[ACPI_STATE_D0].flags.valid = 1;
device->power.states[ACPI_STATE_D0].power = 100;
device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
/*
* Use power resources only if the D0 list of them is populated, because
* some platforms may provide _PR3 only to indicate D3cold support and
* in those cases the power resources list returned by it may be bogus.
*/
if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
device->power.flags.power_resources = 1;
/*
* D3cold is supported if the D3hot list of power resources is
* not empty.
*/
if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
}
if (acpi_bus_init_power(device))
device->flags.power_manageable = 0;
}
static void acpi_bus_get_flags(struct acpi_device *device)
{
/* Presence of _STA indicates 'dynamic_status' */
if (acpi_has_method(device->handle, "_STA"))
device->flags.dynamic_status = 1;
/* Presence of _RMV indicates 'removable' */
if (acpi_has_method(device->handle, "_RMV"))
device->flags.removable = 1;
/* Presence of _EJD|_EJ0 indicates 'ejectable' */
if (acpi_has_method(device->handle, "_EJD") ||
acpi_has_method(device->handle, "_EJ0"))
device->flags.ejectable = 1;
}
static void acpi_device_get_busid(struct acpi_device *device)
{
char bus_id[5] = { '?', 0 };
struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
int i = 0;
/*
* Bus ID
* ------
* The device's Bus ID is simply the object name.
* TBD: Shouldn't this value be unique (within the ACPI namespace)?
*/
if (!acpi_dev_parent(device)) {
strcpy(device->pnp.bus_id, "ACPI");
return;
}
switch (device->device_type) {
case ACPI_BUS_TYPE_POWER_BUTTON:
strcpy(device->pnp.bus_id, "PWRF");
break;
case ACPI_BUS_TYPE_SLEEP_BUTTON:
strcpy(device->pnp.bus_id, "SLPF");
break;
case ACPI_BUS_TYPE_ECDT_EC:
strcpy(device->pnp.bus_id, "ECDT");
break;
default:
acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
/* Clean up trailing underscores (if any) */
for (i = 3; i > 1; i--) {
if (bus_id[i] == '_')
bus_id[i] = '\0';
else
break;
}
strcpy(device->pnp.bus_id, bus_id);
break;
}
}
/*
* acpi_ata_match - see if an acpi object is an ATA device
*
* If an acpi object has one of the ACPI ATA methods defined,
* then we can safely call it an ATA device.
*/
bool acpi_ata_match(acpi_handle handle)
{
return acpi_has_method(handle, "_GTF") ||
acpi_has_method(handle, "_GTM") ||
acpi_has_method(handle, "_STM") ||
acpi_has_method(handle, "_SDD");
}
/*
* acpi_bay_match - see if an acpi object is an ejectable driver bay
*
* If an acpi object is ejectable and has one of the ACPI ATA methods defined,
* then we can safely call it an ejectable drive bay
*/
bool acpi_bay_match(acpi_handle handle)
{
acpi_handle phandle;
if (!acpi_has_method(handle, "_EJ0"))
return false;
if (acpi_ata_match(handle))
return true;
if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
return false;
return acpi_ata_match(phandle);
}
bool acpi_device_is_battery(struct acpi_device *adev)
{
struct acpi_hardware_id *hwid;
list_for_each_entry(hwid, &adev->pnp.ids, list)
if (!strcmp("PNP0C0A", hwid->id))
return true;
return false;
}
static bool is_ejectable_bay(struct acpi_device *adev)
{
acpi_handle handle = adev->handle;
if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
return true;
return acpi_bay_match(handle);
}
/*
* acpi_dock_match - see if an acpi object has a _DCK method
*/
bool acpi_dock_match(acpi_handle handle)
{
return acpi_has_method(handle, "_DCK");
}
static acpi_status
acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
void **return_value)
{
long *cap = context;
if (acpi_has_method(handle, "_BCM") &&
acpi_has_method(handle, "_BCL")) {
acpi_handle_debug(handle, "Found generic backlight support\n");
*cap |= ACPI_VIDEO_BACKLIGHT;
/* We have backlight support, no need to scan further */
return AE_CTRL_TERMINATE;
}
return 0;
}
/* Returns true if the ACPI object is a video device which can be
* handled by video.ko.
* The device will get a Linux specific CID added in scan.c to
* identify the device as an ACPI graphics device
* Be aware that the graphics device may not be physically present
* Use acpi_video_get_capabilities() to detect general ACPI video
* capabilities of present cards
*/
long acpi_is_video_device(acpi_handle handle)
{
long video_caps = 0;
/* Is this device able to support video switching ? */
if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
/* Is this device able to retrieve a video ROM ? */
if (acpi_has_method(handle, "_ROM"))
video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
/* Is this device able to configure which video head to be POSTed ? */
if (acpi_has_method(handle, "_VPO") &&
acpi_has_method(handle, "_GPD") &&
acpi_has_method(handle, "_SPD"))
video_caps |= ACPI_VIDEO_DEVICE_POSTING;
/* Only check for backlight functionality if one of the above hit. */
if (video_caps)
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
&video_caps, NULL);
return video_caps;
}
EXPORT_SYMBOL(acpi_is_video_device);
const char *acpi_device_hid(struct acpi_device *device)
{
struct acpi_hardware_id *hid;
hid = list_first_entry_or_null(&device->pnp.ids, struct acpi_hardware_id, list);
if (!hid)
return dummy_hid;
return hid->id;
}
EXPORT_SYMBOL(acpi_device_hid);
static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
{
struct acpi_hardware_id *id;
id = kmalloc(sizeof(*id), GFP_KERNEL);
if (!id)
return;
id->id = kstrdup_const(dev_id, GFP_KERNEL);
if (!id->id) {
kfree(id);
return;
}
list_add_tail(&id->list, &pnp->ids);
pnp->type.hardware_id = 1;
}
/*
* Old IBM workstations have a DSDT bug wherein the SMBus object
* lacks the SMBUS01 HID and the methods do not have the necessary "_"
* prefix. Work around this.
*/
static bool acpi_ibm_smbus_match(acpi_handle handle)
{
char node_name[ACPI_PATH_SEGMENT_LENGTH];
struct acpi_buffer path = { sizeof(node_name), node_name };
if (!dmi_name_in_vendors("IBM"))
return false;
/* Look for SMBS object */
if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
strcmp("SMBS", path.pointer))
return false;
/* Does it have the necessary (but misnamed) methods? */
if (acpi_has_method(handle, "SBI") &&
acpi_has_method(handle, "SBR") &&
acpi_has_method(handle, "SBW"))
return true;
return false;
}
static bool acpi_object_is_system_bus(acpi_handle handle)
{
acpi_handle tmp;
if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
tmp == handle)
return true;
if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
tmp == handle)
return true;
return false;
}
static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
int device_type)
{
struct acpi_device_info *info = NULL;
struct acpi_pnp_device_id_list *cid_list;
int i;
switch (device_type) {
case ACPI_BUS_TYPE_DEVICE:
if (handle == ACPI_ROOT_OBJECT) {
acpi_add_id(pnp, ACPI_SYSTEM_HID);
break;
}
acpi_get_object_info(handle, &info);
if (!info) {
pr_err("%s: Error reading device info\n", __func__);
return;
}
if (info->valid & ACPI_VALID_HID) {
acpi_add_id(pnp, info->hardware_id.string);
pnp->type.platform_id = 1;
}
if (info->valid & ACPI_VALID_CID) {
cid_list = &info->compatible_id_list;
for (i = 0; i < cid_list->count; i++)
acpi_add_id(pnp, cid_list->ids[i].string);
}
if (info->valid & ACPI_VALID_ADR) {
pnp->bus_address = info->address;
pnp->type.bus_address = 1;
}
if (info->valid & ACPI_VALID_UID)
pnp->unique_id = kstrdup(info->unique_id.string,
GFP_KERNEL);
if (info->valid & ACPI_VALID_CLS)
acpi_add_id(pnp, info->class_code.string);
kfree(info);
/*
* Some devices don't reliably have _HIDs & _CIDs, so add
* synthetic HIDs to make sure drivers can find them.
*/
if (acpi_is_video_device(handle)) {
acpi_add_id(pnp, ACPI_VIDEO_HID);
pnp->type.backlight = 1;
break;
}
if (acpi_bay_match(handle))
acpi_add_id(pnp, ACPI_BAY_HID);
else if (acpi_dock_match(handle))
acpi_add_id(pnp, ACPI_DOCK_HID);
else if (acpi_ibm_smbus_match(handle))
acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
else if (list_empty(&pnp->ids) &&
acpi_object_is_system_bus(handle)) {
/* \_SB, \_TZ, LNXSYBUS */
acpi_add_id(pnp, ACPI_BUS_HID);
strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
strcpy(pnp->device_class, ACPI_BUS_CLASS);
}
break;
case ACPI_BUS_TYPE_POWER:
acpi_add_id(pnp, ACPI_POWER_HID);
break;
case ACPI_BUS_TYPE_PROCESSOR:
acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
break;
case ACPI_BUS_TYPE_THERMAL:
acpi_add_id(pnp, ACPI_THERMAL_HID);
break;
case ACPI_BUS_TYPE_POWER_BUTTON:
acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
break;
case ACPI_BUS_TYPE_SLEEP_BUTTON:
acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
break;
case ACPI_BUS_TYPE_ECDT_EC:
acpi_add_id(pnp, ACPI_ECDT_HID);
break;
}
}
void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
{
struct acpi_hardware_id *id, *tmp;
list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
kfree_const(id->id);
kfree(id);
}
kfree(pnp->unique_id);
}
/**
* acpi_dma_supported - Check DMA support for the specified device.
* @adev: The pointer to acpi device
*
* Return false if DMA is not supported. Otherwise, return true
*/
bool acpi_dma_supported(const struct acpi_device *adev)
{
if (!adev)
return false;
if (adev->flags.cca_seen)
return true;
/*
* Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
* DMA on "Intel platforms". Presumably that includes all x86 and
* ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
*/
if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
return true;
return false;
}
/**
* acpi_get_dma_attr - Check the supported DMA attr for the specified device.
* @adev: The pointer to acpi device
*
* Return enum dev_dma_attr.
*/
enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
{
if (!acpi_dma_supported(adev))
return DEV_DMA_NOT_SUPPORTED;
if (adev->flags.coherent_dma)
return DEV_DMA_COHERENT;
else
return DEV_DMA_NON_COHERENT;
}
/**
* acpi_dma_get_range() - Get device DMA parameters.
*
* @dev: device to configure
* @map: pointer to DMA ranges result
*
* Evaluate DMA regions and return pointer to DMA regions on
* parsing success; it does not update the passed in values on failure.
*
* Return 0 on success, < 0 on failure.
*/
int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map)
{
struct acpi_device *adev;
LIST_HEAD(list);
struct resource_entry *rentry;
int ret;
struct device *dma_dev = dev;
struct bus_dma_region *r;
/*
* Walk the device tree chasing an ACPI companion with a _DMA
* object while we go. Stop if we find a device with an ACPI
* companion containing a _DMA method.
*/
do {
adev = ACPI_COMPANION(dma_dev);
if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
break;
dma_dev = dma_dev->parent;
} while (dma_dev);
if (!dma_dev)
return -ENODEV;
if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
return -EINVAL;
}
ret = acpi_dev_get_dma_resources(adev, &list);
if (ret > 0) {
r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL);
if (!r) {
ret = -ENOMEM;
goto out;
}
*map = r;
list_for_each_entry(rentry, &list, node) {
if (rentry->res->start >= rentry->res->end) {
kfree(*map);
*map = NULL;
ret = -EINVAL;
dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
goto out;
}
r->cpu_start = rentry->res->start;
r->dma_start = rentry->res->start - rentry->offset;
r->size = resource_size(rentry->res);
r++;
}
}
out:
acpi_dev_free_resource_list(&list);
return ret >= 0 ? 0 : ret;
}
#ifdef CONFIG_IOMMU_API
int acpi_iommu_fwspec_init(struct device *dev, u32 id,
struct fwnode_handle *fwnode)
{
int ret;
ret = iommu_fwspec_init(dev, fwnode);
if (ret)
return ret;
return iommu_fwspec_add_ids(dev, &id, 1);
}
static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)
{
int err;
/* Serialise to make dev->iommu stable under our potential fwspec */
mutex_lock(&iommu_probe_device_lock);
/* If we already translated the fwspec there is nothing left to do */
if (dev_iommu_fwspec_get(dev)) {
mutex_unlock(&iommu_probe_device_lock);
return 0;
}
err = iort_iommu_configure_id(dev, id_in);
if (err && err != -EPROBE_DEFER)
err = viot_iommu_configure(dev);
mutex_unlock(&iommu_probe_device_lock);
/*
* If we have reason to believe the IOMMU driver missed the initial
* iommu_probe_device() call for dev, replay it to get things in order.
*/
if (!err && dev->bus)
err = iommu_probe_device(dev);
return err;
}
#else /* !CONFIG_IOMMU_API */
int acpi_iommu_fwspec_init(struct device *dev, u32 id,
struct fwnode_handle *fwnode)
{
return -ENODEV;
}
static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)
{
return -ENODEV;
}
#endif /* !CONFIG_IOMMU_API */
/**
* acpi_dma_configure_id - Set-up DMA configuration for the device.
* @dev: The pointer to the device
* @attr: device dma attributes
* @input_id: input device id const value pointer
*/
int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
const u32 *input_id)
{
int ret;
if (attr == DEV_DMA_NOT_SUPPORTED) {
set_dma_ops(dev, &dma_dummy_ops);
return 0;
}
acpi_arch_dma_setup(dev);
/* Ignore all other errors apart from EPROBE_DEFER */
ret = acpi_iommu_configure_id(dev, input_id);
if (ret == -EPROBE_DEFER)
return -EPROBE_DEFER;
if (ret)
dev_dbg(dev, "Adding to IOMMU failed: %d\n", ret);
arch_setup_dma_ops(dev, attr == DEV_DMA_COHERENT);
return 0;
}
EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
static void acpi_init_coherency(struct acpi_device *adev)
{
unsigned long long cca = 0;
acpi_status status;
struct acpi_device *parent = acpi_dev_parent(adev);
if (parent && parent->flags.cca_seen) {
/*
* From ACPI spec, OSPM will ignore _CCA if an ancestor
* already saw one.
*/
adev->flags.cca_seen = 1;
cca = parent->flags.coherent_dma;
} else {
status = acpi_evaluate_integer(adev->handle, "_CCA",
NULL, &cca);
if (ACPI_SUCCESS(status))
adev->flags.cca_seen = 1;
else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
/*
* If architecture does not specify that _CCA is
* required for DMA-able devices (e.g. x86),
* we default to _CCA=1.
*/
cca = 1;
else
acpi_handle_debug(adev->handle,
"ACPI device is missing _CCA.\n");
}
adev->flags.coherent_dma = cca;
}
static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
{
bool *is_serial_bus_slave_p = data;
if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
return 1;
*is_serial_bus_slave_p = true;
/* no need to do more checking */
return -1;
}
static bool acpi_is_indirect_io_slave(struct acpi_device *device)
{
struct acpi_device *parent = acpi_dev_parent(device);
static const struct acpi_device_id indirect_io_hosts[] = {
{"HISI0191", 0},
{}
};
return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
}
static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
{
struct list_head resource_list;
bool is_serial_bus_slave = false;
static const struct acpi_device_id ignore_serial_bus_ids[] = {
/*
* These devices have multiple SerialBus resources and a client
* device must be instantiated for each of them, each with
* its own device id.
* Normally we only instantiate one client device for the first
* resource, using the ACPI HID as id. These special cases are handled
* by the drivers/platform/x86/serial-multi-instantiate.c driver, which
* knows which client device id to use for each resource.
*/
{"BSG1160", },
{"BSG2150", },
{"CSC3551", },
{"CSC3554", },
{"CSC3556", },
{"CSC3557", },
{"INT33FE", },
{"INT3515", },
/* Non-conforming _HID for Cirrus Logic already released */
{"CLSA0100", },
{"CLSA0101", },
/*
* Some ACPI devs contain SerialBus resources even though they are not
* attached to a serial bus at all.
*/
{ACPI_VIDEO_HID, },
{"MSHW0028", },
/*
* HIDs of device with an UartSerialBusV2 resource for which userspace
* expects a regular tty cdev to be created (instead of the in kernel
* serdev) and which have a kernel driver which expects a platform_dev
* such as the rfkill-gpio driver.
*/
{"BCM4752", },
{"LNV4752", },
{}
};
if (acpi_is_indirect_io_slave(device))
return true;
/* Macs use device properties in lieu of _CRS resources */
if (x86_apple_machine &&
(fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
fwnode_property_present(&device->fwnode, "i2cAddress") ||
fwnode_property_present(&device->fwnode, "baud")))
return true;
if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
return false;
INIT_LIST_HEAD(&resource_list);
acpi_dev_get_resources(device, &resource_list,
acpi_check_serial_bus_slave,
&is_serial_bus_slave);
acpi_dev_free_resource_list(&resource_list);
return is_serial_bus_slave;
}
void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
int type, void (*release)(struct device *))
{
struct acpi_device *parent = acpi_find_parent_acpi_dev(handle);
INIT_LIST_HEAD(&device->pnp.ids);
device->device_type = type;
device->handle = handle;
device->dev.parent = parent ? &parent->dev : NULL;
device->dev.release = release;
device->dev.bus = &acpi_bus_type;
device->dev.groups = acpi_groups;
fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
acpi_set_device_status(device, ACPI_STA_DEFAULT);
acpi_device_get_busid(device);
acpi_set_pnp_ids(handle, &device->pnp, type);
acpi_init_properties(device);
acpi_bus_get_flags(device);
device->flags.match_driver = false;
device->flags.initialized = true;
device->flags.enumeration_by_parent =
acpi_device_enumeration_by_parent(device);
acpi_device_clear_enumerated(device);
device_initialize(&device->dev);
dev_set_uevent_suppress(&device->dev, true);
acpi_init_coherency(device);
}
static void acpi_scan_dep_init(struct acpi_device *adev)
{
struct acpi_dep_data *dep;
list_for_each_entry(dep, &acpi_dep_list, node) {
if (dep->consumer == adev->handle) {
if (dep->honor_dep)
adev->flags.honor_deps = 1;
if (!dep->met)
adev->dep_unmet++;
}
}
}
void acpi_device_add_finalize(struct acpi_device *device)
{
dev_set_uevent_suppress(&device->dev, false);
kobject_uevent(&device->dev.kobj, KOBJ_ADD);
}
static void acpi_scan_init_status(struct acpi_device *adev)
{
if (acpi_bus_get_status(adev))
acpi_set_device_status(adev, 0);
}
static int acpi_add_single_object(struct acpi_device **child,
acpi_handle handle, int type, bool dep_init)
{
struct acpi_device *device;
bool release_dep_lock = false;
int result;
device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
if (!device)
return -ENOMEM;
acpi_init_device_object(device, handle, type, acpi_device_release);
/*
* Getting the status is delayed till here so that we can call
* acpi_bus_get_status() and use its quirk handling. Note that
* this must be done before the get power-/wakeup_dev-flags calls.
*/
if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
if (dep_init) {
mutex_lock(&acpi_dep_list_lock);
/*
* Hold the lock until the acpi_tie_acpi_dev() call
* below to prevent concurrent acpi_scan_clear_dep()
* from deleting a dependency list entry without
* updating dep_unmet for the device.
*/
release_dep_lock = true;
acpi_scan_dep_init(device);
}
acpi_scan_init_status(device);
}
acpi_bus_get_power_flags(device);
acpi_bus_get_wakeup_device_flags(device);
result = acpi_tie_acpi_dev(device);
if (release_dep_lock)
mutex_unlock(&acpi_dep_list_lock);
if (!result)
result = acpi_device_add(device);
if (result) {
acpi_device_release(&device->dev);
return result;
}
acpi_power_add_remove_device(device, true);
acpi_device_add_finalize(device);
acpi_handle_debug(handle, "Added as %s, parent %s\n",
dev_name(&device->dev), device->dev.parent ?
dev_name(device->dev.parent) : "(null)");
*child = device;
return 0;
}
static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
void *context)
{
struct resource *res = context;
if (acpi_dev_resource_memory(ares, res))
return AE_CTRL_TERMINATE;
return AE_OK;
}
static bool acpi_device_should_be_hidden(acpi_handle handle)
{
acpi_status status;
struct resource res;
/* Check if it should ignore the UART device */
if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
return false;
/*
* The UART device described in SPCR table is assumed to have only one
* memory resource present. So we only look for the first one here.
*/
status = acpi_walk_resources(handle, METHOD_NAME__CRS,
acpi_get_resource_memory, &res);
if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
return false;
acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
&res.start);
return true;
}
bool acpi_device_is_present(const struct acpi_device *adev)
{
return adev->status.present || adev->status.functional;
}
bool acpi_device_is_enabled(const struct acpi_device *adev)
{
return adev->status.enabled;
}
static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
const char *idstr,
const struct acpi_device_id **matchid)
{
const struct acpi_device_id *devid;
if (handler->match)
return handler->match(idstr, matchid);
for (devid = handler->ids; devid->id[0]; devid++)
if (!strcmp((char *)devid->id, idstr)) {
if (matchid)
*matchid = devid;
return true;
}
return false;
}
static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
const struct acpi_device_id **matchid)
{
struct acpi_scan_handler *handler;
list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
if (acpi_scan_handler_matching(handler, idstr, matchid))
return handler;
return NULL;
}
void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
{
if (!!hotplug->enabled == !!val)
return;
mutex_lock(&acpi_scan_lock);
hotplug->enabled = val;
mutex_unlock(&acpi_scan_lock);
}
int acpi_scan_add_dep(acpi_handle handle, struct acpi_handle_list *dep_devices)
{
u32 count;
int i;
for (count = 0, i = 0; i < dep_devices->count; i++) {
struct acpi_device_info *info;
struct acpi_dep_data *dep;
bool skip, honor_dep;
acpi_status status;
status = acpi_get_object_info(dep_devices->handles[i], &info);
if (ACPI_FAILURE(status)) {
acpi_handle_debug(handle, "Error reading _DEP device info\n");
continue;
}
skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids);
kfree(info);
if (skip)
continue;
dep = kzalloc(sizeof(*dep), GFP_KERNEL);
if (!dep)
continue;
count++;
dep->supplier = dep_devices->handles[i];
dep->consumer = handle;
dep->honor_dep = honor_dep;
mutex_lock(&acpi_dep_list_lock);
list_add_tail(&dep->node, &acpi_dep_list);
mutex_unlock(&acpi_dep_list_lock);
}
acpi_handle_list_free(dep_devices);
return count;
}
static void acpi_scan_init_hotplug(struct acpi_device *adev)
{
struct acpi_hardware_id *hwid;
if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
acpi_dock_add(adev);
return;
}
list_for_each_entry(hwid, &adev->pnp.ids, list) {
struct acpi_scan_handler *handler;
handler = acpi_scan_match_handler(hwid->id, NULL);
if (handler) {
adev->flags.hotplug_notify = true;
break;
}
}
}
u32 __weak arch_acpi_add_auto_dep(acpi_handle handle) { return 0; }
static u32 acpi_scan_check_dep(acpi_handle handle)
{
struct acpi_handle_list dep_devices;
u32 count = 0;
/*
* Some architectures like RISC-V need to add dependencies for
* all devices which use GSI to the interrupt controller so that
* interrupt controller is probed before any of those devices.
* Instead of mandating _DEP on all the devices, detect the
* dependency and add automatically.
*/
count += arch_acpi_add_auto_dep(handle);
/*
* Check for _HID here to avoid deferring the enumeration of:
* 1. PCI devices.
* 2. ACPI nodes describing USB ports.
* Still, checking for _HID catches more then just these cases ...
*/
if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID"))
return count;
if (!acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices)) {
acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
return count;
}
count += acpi_scan_add_dep(handle, &dep_devices);
return count;
}
static acpi_status acpi_scan_check_crs_csi2_cb(acpi_handle handle, u32 a, void *b, void **c)
{
acpi_mipi_check_crs_csi2(handle);
return AE_OK;
}
static acpi_status acpi_bus_check_add(acpi_handle handle, bool first_pass,
struct acpi_device **adev_p)
{
struct acpi_device *device = acpi_fetch_acpi_dev(handle);
acpi_object_type acpi_type;
int type;
if (device)
goto out;
if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
return AE_OK;
switch (acpi_type) {
case ACPI_TYPE_DEVICE:
if (acpi_device_should_be_hidden(handle))
return AE_OK;
if (first_pass) {
acpi_mipi_check_crs_csi2(handle);
/* Bail out if there are dependencies. */
if (acpi_scan_check_dep(handle) > 0) {
/*
* The entire CSI-2 connection graph needs to be
* extracted before any drivers or scan handlers
* are bound to struct device objects, so scan
* _CRS CSI-2 resource descriptors for all
* devices below the current handle.
*/
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
ACPI_UINT32_MAX,
acpi_scan_check_crs_csi2_cb,
NULL, NULL, NULL);
return AE_CTRL_DEPTH;
}
}
fallthrough;
case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
type = ACPI_BUS_TYPE_DEVICE;
break;
case ACPI_TYPE_PROCESSOR:
type = ACPI_BUS_TYPE_PROCESSOR;
break;
case ACPI_TYPE_THERMAL:
type = ACPI_BUS_TYPE_THERMAL;
break;
case ACPI_TYPE_POWER:
acpi_add_power_resource(handle);
fallthrough;
default:
return AE_OK;
}
/*
* If first_pass is true at this point, the device has no dependencies,
* or the creation of the device object would have been postponed above.
*/
acpi_add_single_object(&device, handle, type, !first_pass);
if (!device)
return AE_CTRL_DEPTH;
acpi_scan_init_hotplug(device);
out:
if (!*adev_p)
*adev_p = device;
return AE_OK;
}
static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
void *not_used, void **ret_p)
{
return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
}
static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
void *not_used, void **ret_p)
{
return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
}
static void acpi_default_enumeration(struct acpi_device *device)
{
/*
* Do not enumerate devices with enumeration_by_parent flag set as
* they will be enumerated by their respective parents.
*/
if (!device->flags.enumeration_by_parent) {
acpi_create_platform_device(device, NULL);
acpi_device_set_enumerated(device);
} else {
blocking_notifier_call_chain(&acpi_reconfig_chain,
ACPI_RECONFIG_DEVICE_ADD, device);
}
}
static const struct acpi_device_id generic_device_ids[] = {
{ACPI_DT_NAMESPACE_HID, },
{"", },
};
static int acpi_generic_device_attach(struct acpi_device *adev,
const struct acpi_device_id *not_used)
{
/*
* Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
* below can be unconditional.
*/
if (adev->data.of_compatible)
acpi_default_enumeration(adev);
return 1;
}
static struct acpi_scan_handler generic_device_handler = {
.ids = generic_device_ids,
.attach = acpi_generic_device_attach,
};
static int acpi_scan_attach_handler(struct acpi_device *device)
{
struct acpi_hardware_id *hwid;
int ret = 0;
list_for_each_entry(hwid, &device->pnp.ids, list) {
const struct acpi_device_id *devid;
struct acpi_scan_handler *handler;
handler = acpi_scan_match_handler(hwid->id, &devid);
if (handler) {
if (!handler->attach) {
device->pnp.type.platform_id = 0;
continue;
}
device->handler = handler;
ret = handler->attach(device, devid);
if (ret > 0)
break;
device->handler = NULL;
if (ret < 0)
break;
}
}
return ret;
}
static int acpi_bus_attach(struct acpi_device *device, void *first_pass)
{
bool skip = !first_pass && device->flags.visited;
acpi_handle ejd;
int ret;
if (skip)
goto ok;
if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
register_dock_dependent_device(device, ejd);
acpi_bus_get_status(device);
/* Skip devices that are not ready for enumeration (e.g. not present) */
if (!acpi_dev_ready_for_enumeration(device)) {
device->flags.initialized = false;
acpi_device_clear_enumerated(device);
device->flags.power_manageable = 0;
return 0;
}
if (device->handler)
goto ok;
acpi_ec_register_opregions(device);
if (!device->flags.initialized) {
device->flags.power_manageable =
device->power.states[ACPI_STATE_D0].flags.valid;
if (acpi_bus_init_power(device))
device->flags.power_manageable = 0;
device->flags.initialized = true;
} else if (device->flags.visited) {
goto ok;
}
ret = acpi_scan_attach_handler(device);
if (ret < 0)
return 0;
device->flags.match_driver = true;
if (ret > 0 && !device->flags.enumeration_by_parent) {
acpi_device_set_enumerated(device);
goto ok;
}
ret = device_attach(&device->dev);
if (ret < 0)
return 0;
if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
acpi_default_enumeration(device);
else
acpi_device_set_enumerated(device);
ok:
acpi_dev_for_each_child(device, acpi_bus_attach, first_pass);
if (!skip && device->handler && device->handler->hotplug.notify_online)
device->handler->hotplug.notify_online(device);
return 0;
}
static int acpi_dev_get_next_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
{
struct acpi_device **adev_p = data;
struct acpi_device *adev = *adev_p;
/*
* If we're passed a 'previous' consumer device then we need to skip
* any consumers until we meet the previous one, and then NULL @data
* so the next one can be returned.
*/
if (adev) {
if (dep->consumer == adev->handle)
*adev_p = NULL;
return 0;
}
adev = acpi_get_acpi_dev(dep->consumer);
if (adev) {
*(struct acpi_device **)data = adev;
return 1;
}
/* Continue parsing if the device object is not present. */
return 0;
}
struct acpi_scan_clear_dep_work {
struct work_struct work;
struct acpi_device *adev;
};
static void acpi_scan_clear_dep_fn(struct work_struct *work)
{
struct acpi_scan_clear_dep_work *cdw;
cdw = container_of(work, struct acpi_scan_clear_dep_work, work);
acpi_scan_lock_acquire();
acpi_bus_attach(cdw->adev, (void *)true);
acpi_scan_lock_release();
acpi_dev_put(cdw->adev);
kfree(cdw);
}
static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
{
struct acpi_scan_clear_dep_work *cdw;
if (adev->dep_unmet)
return false;
cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);
if (!cdw)
return false;
cdw->adev = adev;
INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);
/*
* Since the work function may block on the lock until the entire
* initial enumeration of devices is complete, put it into the unbound
* workqueue.
*/
queue_work(system_unbound_wq, &cdw->work);
return true;
}
static void acpi_scan_delete_dep_data(struct acpi_dep_data *dep)
{
list_del(&dep->node);
kfree(dep);
}
static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
{
struct acpi_device *adev = acpi_get_acpi_dev(dep->consumer);
if (adev) {
adev->dep_unmet--;
if (!acpi_scan_clear_dep_queue(adev))
acpi_dev_put(adev);
}
if (dep->free_when_met)
acpi_scan_delete_dep_data(dep);
else
dep->met = true;
return 0;
}
/**
* acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list
* @handle: The ACPI handle of the supplier device
* @callback: Pointer to the callback function to apply
* @data: Pointer to some data to pass to the callback
*
* The return value of the callback determines this function's behaviour. If 0
* is returned we continue to iterate over acpi_dep_list. If a positive value
* is returned then the loop is broken but this function returns 0. If a
* negative value is returned by the callback then the loop is broken and that
* value is returned as the final error.
*/
static int acpi_walk_dep_device_list(acpi_handle handle,
int (*callback)(struct acpi_dep_data *, void *),
void *data)
{
struct acpi_dep_data *dep, *tmp;
int ret = 0;
mutex_lock(&acpi_dep_list_lock);
list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
if (dep->supplier == handle) {
ret = callback(dep, data);
if (ret)
break;
}
}
mutex_unlock(&acpi_dep_list_lock);
return ret > 0 ? 0 : ret;
}
/**
* acpi_dev_clear_dependencies - Inform consumers that the device is now active
* @supplier: Pointer to the supplier &struct acpi_device
*
* Clear dependencies on the given device.
*/
void acpi_dev_clear_dependencies(struct acpi_device *supplier)
{
acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
}
EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
/**
* acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration
* @device: Pointer to the &struct acpi_device to check
*
* Check if the device is present and has no unmet dependencies.
*
* Return true if the device is ready for enumeratino. Otherwise, return false.
*/
bool acpi_dev_ready_for_enumeration(const struct acpi_device *device)
{
if (device->flags.honor_deps && device->dep_unmet)
return false;
return acpi_device_is_present(device);
}
EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);
/**
* acpi_dev_get_next_consumer_dev - Return the next adev dependent on @supplier
* @supplier: Pointer to the dependee device
* @start: Pointer to the current dependent device
*
* Returns the next &struct acpi_device which declares itself dependent on
* @supplier via the _DEP buffer, parsed from the acpi_dep_list.
*
* If the returned adev is not passed as @start to this function, the caller is
* responsible for putting the reference to adev when it is no longer needed.
*/
struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier,
struct acpi_device *start)
{
struct acpi_device *adev = start;
acpi_walk_dep_device_list(supplier->handle,
acpi_dev_get_next_consumer_dev_cb, &adev);
acpi_dev_put(start);
if (adev == start)
return NULL;
return adev;
}
EXPORT_SYMBOL_GPL(acpi_dev_get_next_consumer_dev);
static void acpi_scan_postponed_branch(acpi_handle handle)
{
struct acpi_device *adev = NULL;
if (ACPI_FAILURE(acpi_bus_check_add(handle, false, &adev)))
return;
acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
acpi_bus_check_add_2, NULL, NULL, (void **)&adev);
/*
* Populate the ACPI _CRS CSI-2 software nodes for the ACPI devices that
* have been added above.
*/
acpi_mipi_init_crs_csi2_swnodes();
acpi_bus_attach(adev, NULL);
}
static void acpi_scan_postponed(void)
{
struct acpi_dep_data *dep, *tmp;
mutex_lock(&acpi_dep_list_lock);
list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
acpi_handle handle = dep->consumer;
/*
* In case there are multiple acpi_dep_list entries with the
* same consumer, skip the current entry if the consumer device
* object corresponding to it is present already.
*/
if (!acpi_fetch_acpi_dev(handle)) {
/*
* Even though the lock is released here, tmp is
* guaranteed to be valid, because none of the list
* entries following dep is marked as "free when met"
* and so they cannot be deleted.
*/
mutex_unlock(&acpi_dep_list_lock);
acpi_scan_postponed_branch(handle);
mutex_lock(&acpi_dep_list_lock);
}
if (dep->met)
acpi_scan_delete_dep_data(dep);
else
dep->free_when_met = true;
}
mutex_unlock(&acpi_dep_list_lock);
}
/**
* acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
* @handle: Root of the namespace scope to scan.
*
* Scan a given ACPI tree (probably recently hot-plugged) and create and add
* found devices.
*
* If no devices were found, -ENODEV is returned, but it does not mean that
* there has been a real error. There just have been no suitable ACPI objects
* in the table trunk from which the kernel could create a device and add an
* appropriate driver.
*
* Must be called under acpi_scan_lock.
*/
int acpi_bus_scan(acpi_handle handle)
{
struct acpi_device *device = NULL;
/* Pass 1: Avoid enumerating devices with missing dependencies. */
if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
acpi_bus_check_add_1, NULL, NULL,
(void **)&device);
if (!device)
return -ENODEV;
/*
* Set up ACPI _CRS CSI-2 software nodes using information extracted
* from the _CRS CSI-2 resource descriptors during the ACPI namespace
* walk above and MIPI DisCo for Imaging device properties.
*/
acpi_mipi_scan_crs_csi2();
acpi_mipi_init_crs_csi2_swnodes();
acpi_bus_attach(device, (void *)true);
/* Pass 2: Enumerate all of the remaining devices. */
acpi_scan_postponed();
acpi_mipi_crs_csi2_cleanup();
return 0;
}
EXPORT_SYMBOL(acpi_bus_scan);
/**
* acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
* @adev: Root of the ACPI namespace scope to walk.
*
* Must be called under acpi_scan_lock.
*/
void acpi_bus_trim(struct acpi_device *adev)
{
uintptr_t flags = 0;
acpi_scan_check_and_detach(adev, (void *)flags);
}
EXPORT_SYMBOL_GPL(acpi_bus_trim);
int acpi_bus_register_early_device(int type)
{
struct acpi_device *device = NULL;
int result;
result = acpi_add_single_object(&device, NULL, type, false);
if (result)
return result;
device->flags.match_driver = true;
return device_attach(&device->dev);
}
EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
static void acpi_bus_scan_fixed(void)
{
if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
struct acpi_device *adev = NULL;
acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON,
false);
if (adev) {
adev->flags.match_driver = true;
if (device_attach(&adev->dev) >= 0)
device_init_wakeup(&adev->dev, true);
else
dev_dbg(&adev->dev, "No driver\n");
}
}
if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
struct acpi_device *adev = NULL;
acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON,
false);
if (adev) {
adev->flags.match_driver = true;
if (device_attach(&adev->dev) < 0)
dev_dbg(&adev->dev, "No driver\n");
}
}
}
static void __init acpi_get_spcr_uart_addr(void)
{
acpi_status status;
struct acpi_table_spcr *spcr_ptr;
status = acpi_get_table(ACPI_SIG_SPCR, 0,
(struct acpi_table_header **)&spcr_ptr);
if (ACPI_FAILURE(status)) {
pr_warn("STAO table present, but SPCR is missing\n");
return;
}
spcr_uart_addr = spcr_ptr->serial_port.address;
acpi_put_table((struct acpi_table_header *)spcr_ptr);
}
static bool acpi_scan_initialized;
void __init acpi_scan_init(void)
{
acpi_status status;
struct acpi_table_stao *stao_ptr;
acpi_pci_root_init();
acpi_pci_link_init();
acpi_processor_init();
acpi_platform_init();
acpi_lpss_init();
acpi_apd_init();
acpi_cmos_rtc_init();
acpi_container_init();
acpi_memory_hotplug_init();
acpi_watchdog_init();
acpi_pnp_init();
acpi_int340x_thermal_init();
acpi_init_lpit();
acpi_scan_add_handler(&generic_device_handler);
/*
* If there is STAO table, check whether it needs to ignore the UART
* device in SPCR table.
*/
status = acpi_get_table(ACPI_SIG_STAO, 0,
(struct acpi_table_header **)&stao_ptr);
if (ACPI_SUCCESS(status)) {
if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
pr_info("STAO Name List not yet supported.\n");
if (stao_ptr->ignore_uart)
acpi_get_spcr_uart_addr();
acpi_put_table((struct acpi_table_header *)stao_ptr);
}
acpi_gpe_apply_masked_gpes();
acpi_update_all_gpes();
/*
* Although we call __add_memory() that is documented to require the
* device_hotplug_lock, it is not necessary here because this is an
* early code when userspace or any other code path cannot trigger
* hotplug/hotunplug operations.
*/
mutex_lock(&acpi_scan_lock);
/*
* Enumerate devices in the ACPI namespace.
*/
if (acpi_bus_scan(ACPI_ROOT_OBJECT))
goto unlock;
acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT);
if (!acpi_root)
goto unlock;
/* Fixed feature devices do not exist on HW-reduced platform */
if (!acpi_gbl_reduced_hardware)
acpi_bus_scan_fixed();
acpi_turn_off_unused_power_resources();
acpi_scan_initialized = true;
unlock:
mutex_unlock(&acpi_scan_lock);
}
static struct acpi_probe_entry *ape;
static int acpi_probe_count;
static DEFINE_MUTEX(acpi_probe_mutex);
static int __init acpi_match_madt(union acpi_subtable_headers *header,
const unsigned long end)
{
if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
if (!ape->probe_subtbl(header, end))
acpi_probe_count++;
return 0;
}
void __weak arch_sort_irqchip_probe(struct acpi_probe_entry *ap_head, int nr) { }
int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
{
int count = 0;
if (acpi_disabled)
return 0;
mutex_lock(&acpi_probe_mutex);
arch_sort_irqchip_probe(ap_head, nr);
for (ape = ap_head; nr; ape++, nr--) {
if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
acpi_probe_count = 0;
acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
count += acpi_probe_count;
} else {
int res;
res = acpi_table_parse(ape->id, ape->probe_table);
if (!res)
count++;
}
}
mutex_unlock(&acpi_probe_mutex);
return count;
}
static void acpi_table_events_fn(struct work_struct *work)
{
acpi_scan_lock_acquire();
acpi_bus_scan(ACPI_ROOT_OBJECT);
acpi_scan_lock_release();
kfree(work);
}
void acpi_scan_table_notify(void)
{
struct work_struct *work;
if (!acpi_scan_initialized)
return;
work = kmalloc(sizeof(*work), GFP_KERNEL);
if (!work)
return;
INIT_WORK(work, acpi_table_events_fn);
schedule_work(work);
}
int acpi_reconfig_notifier_register(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
}
EXPORT_SYMBOL(acpi_reconfig_notifier_register);
int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
}
EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);