mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 00:48:50 +00:00
893e2f9eac
- reduce area lock contention for non-primary IO TLB pools (Petr Tesarik) - don't store redundant offsets in the dma_ranges stuctures (Robin Murphy) - clear dev->dma_mem when freeing per-device pools (Joakim Zhang) -----BEGIN PGP SIGNATURE----- iQI/BAABCgApFiEEgdbnc3r/njty3Iq9D55TZVIEUYMFAmWcGxQLHGhjaEBsc3Qu ZGUACgkQD55TZVIEUYNf6hAAi9wP1ehnIqHCczCxpideyJnE76r+LgjInjudQUqE cnpl7E+dO/e/7Trk+L7hIrzi5uz8m9e+DZgL9wUY4h5mvJ+8ELet3Ec62UMVL1g0 cWSYOtlMdUZn9Oy+qy2TTCa//1HyzcWQdplVwcOqD7zCLO4PavUR18+Vw5eDUpBR TE8EB+7P8ta8XSFnsryZS4zI1AhTTjZfh8ZgPdp+niBh7XAqOFNn3WiGK4qvA9o6 nIjIV6ydBjZYkyYPeDsqszqmZG64mEeGUZhLWmjAyg1/c8so7uFviNfJ05od34js aWpmFxrM9Mm4BaBiU3FsSQkMBGCGaD/H2UXjIl1Qayt+pzUfaP7+8UWWo/T7Mj35 RFKe9xzlPY8rqOszdBBvy6lCWguHXw4d4IFoqOz+YoUaxlV+RAbFOCHtW2BNvtPe b1YCr/FKNQ8NxsJWnbcehDtClY461pqBbaDrio3K7eTJgG10biAoWBfPhV+5VEer aB14krQcn7v1vXjfLu2huSrPt1ZjXuWVfXA3nO3Mt3VWxZWat82gLkFyt5N6ZfQ4 juaDMX3Vzlz3VPf4MHFC+yFRx55b/9X26lC1BlSoo4tAknoo746Lvy/PasZarILC sGPt+2BVlPQ466zkjky4GtoNof1TMNuPF0Xr/mNCEjxCYUGQcTIdmOvA9y8mu/V+ 7M4= =v5F+ -----END PGP SIGNATURE----- Merge tag 'dma-mapping-6.8-2024-01-08' of git://git.infradead.org/users/hch/dma-mapping Pull dma-mapping updates from Christoph Hellwig: - reduce area lock contention for non-primary IO TLB pools (Petr Tesarik) - don't store redundant offsets in the dma_ranges stuctures (Robin Murphy) - clear dev->dma_mem when freeing per-device pools (Joakim Zhang) * tag 'dma-mapping-6.8-2024-01-08' of git://git.infradead.org/users/hch/dma-mapping: dma-mapping: clear dev->dma_mem to NULL after freeing it swiotlb: reduce area lock contention for non-primary IO TLB pools dma-mapping: don't store redundant offsets
2790 lines
70 KiB
C
2790 lines
70 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,
|
|
int (*notify)(struct acpi_device *, u32),
|
|
void (*uevent)(struct acpi_device *, u32))
|
|
{
|
|
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;
|
|
}
|
|
|
|
static int acpi_scan_hot_remove(struct acpi_device *device)
|
|
{
|
|
acpi_handle handle = device->handle;
|
|
unsigned long long sta;
|
|
acpi_status status;
|
|
|
|
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_bus_trim(device);
|
|
|
|
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);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_scan_device_not_enumerated(struct acpi_device *adev)
|
|
{
|
|
if (!acpi_device_enumerated(adev)) {
|
|
dev_warn(&adev->dev, "Still not enumerated\n");
|
|
return -EALREADY;
|
|
}
|
|
acpi_bus_trim(adev);
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_scan_device_check(struct acpi_device *adev)
|
|
{
|
|
int error;
|
|
|
|
acpi_bus_get_status(adev);
|
|
if (acpi_device_is_present(adev)) {
|
|
/*
|
|
* 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_warn(&adev->dev, "Already enumerated\n");
|
|
return -EALREADY;
|
|
}
|
|
error = acpi_bus_scan(adev->handle);
|
|
if (error) {
|
|
dev_warn(&adev->dev, "Namespace scan failure\n");
|
|
return error;
|
|
}
|
|
if (!adev->handler) {
|
|
dev_warn(&adev->dev, "Enumeration failure\n");
|
|
error = -ENODEV;
|
|
}
|
|
} else {
|
|
error = acpi_scan_device_not_enumerated(adev);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static int acpi_scan_bus_check(struct acpi_device *adev, void *not_used)
|
|
{
|
|
struct acpi_scan_handler *handler = adev->handler;
|
|
int error;
|
|
|
|
acpi_bus_get_status(adev);
|
|
if (!acpi_device_is_present(adev)) {
|
|
acpi_scan_device_not_enumerated(adev);
|
|
return 0;
|
|
}
|
|
if (handler && handler->hotplug.scan_dependent)
|
|
return handler->hotplug.scan_dependent(adev);
|
|
|
|
error = acpi_bus_scan(adev->handle);
|
|
if (error) {
|
|
dev_warn(&adev->dev, "Namespace scan failure\n");
|
|
return error;
|
|
}
|
|
return acpi_dev_for_each_child(adev, acpi_scan_bus_check, NULL);
|
|
}
|
|
|
|
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, NULL);
|
|
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 {
|
|
int (*notify)(struct acpi_device *, u32);
|
|
|
|
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;
|
|
}
|
|
|
|
result = acpi_device_setup_files(device);
|
|
if (result)
|
|
pr_err("Error creating sysfs interface for device %s\n",
|
|
dev_name(&device->dev));
|
|
|
|
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 */
|
|
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;
|
|
|
|
if (list_empty(&device->pnp.ids))
|
|
return dummy_hid;
|
|
|
|
hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
|
|
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,
|
|
const struct iommu_ops *ops)
|
|
{
|
|
int ret = iommu_fwspec_init(dev, fwnode, ops);
|
|
|
|
if (!ret)
|
|
ret = iommu_fwspec_add_ids(dev, &id, 1);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
|
|
{
|
|
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
|
|
|
|
return fwspec ? fwspec->ops : NULL;
|
|
}
|
|
|
|
static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
|
|
const u32 *id_in)
|
|
{
|
|
int err;
|
|
const struct iommu_ops *ops;
|
|
|
|
/* 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,
|
|
* return the iommu_ops.
|
|
*/
|
|
ops = acpi_iommu_fwspec_ops(dev);
|
|
if (ops) {
|
|
mutex_unlock(&iommu_probe_device_lock);
|
|
return ops;
|
|
}
|
|
|
|
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);
|
|
|
|
/* Ignore all other errors apart from EPROBE_DEFER */
|
|
if (err == -EPROBE_DEFER) {
|
|
return ERR_PTR(err);
|
|
} else if (err) {
|
|
dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
|
|
return NULL;
|
|
}
|
|
return acpi_iommu_fwspec_ops(dev);
|
|
}
|
|
|
|
#else /* !CONFIG_IOMMU_API */
|
|
|
|
int acpi_iommu_fwspec_init(struct device *dev, u32 id,
|
|
struct fwnode_handle *fwnode,
|
|
const struct iommu_ops *ops)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
|
|
const u32 *id_in)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
#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)
|
|
{
|
|
const struct iommu_ops *iommu;
|
|
|
|
if (attr == DEV_DMA_NOT_SUPPORTED) {
|
|
set_dma_ops(dev, &dma_dummy_ops);
|
|
return 0;
|
|
}
|
|
|
|
acpi_arch_dma_setup(dev);
|
|
|
|
iommu = acpi_iommu_configure_id(dev, input_id);
|
|
if (PTR_ERR(iommu) == -EPROBE_DEFER)
|
|
return -EPROBE_DEFER;
|
|
|
|
arch_setup_dma_ops(dev, 0, U64_MAX,
|
|
iommu, 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", },
|
|
{"CSC3556", },
|
|
{"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;
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
static u32 acpi_scan_check_dep(acpi_handle handle)
|
|
{
|
|
struct acpi_handle_list dep_devices;
|
|
u32 count;
|
|
int i;
|
|
|
|
/*
|
|
* 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 0;
|
|
|
|
if (!acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices)) {
|
|
acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
|
|
return 0;
|
|
}
|
|
|
|
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 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;
|
|
|
|
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);
|
|
|
|
static int acpi_bus_trim_one(struct acpi_device *adev, void *not_used)
|
|
{
|
|
struct acpi_scan_handler *handler = adev->handler;
|
|
|
|
acpi_dev_for_each_child_reverse(adev, acpi_bus_trim_one, NULL);
|
|
|
|
adev->flags.match_driver = false;
|
|
if (handler) {
|
|
if (handler->detach)
|
|
handler->detach(adev);
|
|
|
|
adev->handler = NULL;
|
|
} 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;
|
|
acpi_device_clear_enumerated(adev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
acpi_bus_trim_one(adev, NULL);
|
|
}
|
|
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;
|
|
}
|
|
|
|
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);
|
|
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);
|