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Power management fixes for 5.6-rc2 

Fix three issues related to the handling of wakeup events signaled
 through the ACPI SCI while suspended to idle (Rafael Wysocki) and
 unexport an internal cpufreq variable (Yangtao Li).
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Merge tag 'pm-5.6-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "Fix three issues related to the handling of wakeup events signaled
  through the ACPI SCI while suspended to idle (Rafael Wysocki) and
  unexport an internal cpufreq variable (Yangtao Li)"

* tag 'pm-5.6-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: PM: s2idle: Prevent spurious SCIs from waking up the system
  ACPICA: Introduce acpi_any_gpe_status_set()
  ACPI: PM: s2idle: Avoid possible race related to the EC GPE
  ACPI: EC: Fix flushing of pending work
  cpufreq: Make cpufreq_global_kobject static
This commit is contained in:
Linus Torvalds 2020-02-14 12:34:30 -08:00
parent 81f3011cbf 3629ac5b92
commit 4e03e4e6d2
10 changed files with 177 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/acpi/acpica/achware.h
View File

@ -101,6 +101,8 @@ acpi_status acpi_hw_enable_all_runtime_gpes(void);
acpi_status acpi_hw_enable_all_wakeup_gpes(void);
u8 acpi_hw_check_all_gpes(void);
acpi_status
acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
struct acpi_gpe_block_info *gpe_block,

32
drivers/acpi/acpica/evxfgpe.c
View File

@ -795,6 +795,38 @@ acpi_status acpi_enable_all_wakeup_gpes(void)
ACPI_EXPORT_SYMBOL(acpi_enable_all_wakeup_gpes)
/******************************************************************************
*
* FUNCTION: acpi_any_gpe_status_set
*
* PARAMETERS: None
*
* RETURN: Whether or not the status bit is set for any GPE
*
* DESCRIPTION: Check the status bits of all enabled GPEs and return TRUE if any
* of them is set or FALSE otherwise.
*
******************************************************************************/
u32 acpi_any_gpe_status_set(void)
{
acpi_status status;
u8 ret;
ACPI_FUNCTION_TRACE(acpi_any_gpe_status_set);
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
if (ACPI_FAILURE(status)) {
return (FALSE);
}
ret = acpi_hw_check_all_gpes();
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
return (ret);
}
ACPI_EXPORT_SYMBOL(acpi_any_gpe_status_set)
/*******************************************************************************
*
* FUNCTION: acpi_install_gpe_block

71
drivers/acpi/acpica/hwgpe.c
View File

@ -444,6 +444,53 @@ acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_get_gpe_block_status
*
* PARAMETERS: gpe_xrupt_info - GPE Interrupt info
* gpe_block - Gpe Block info
*
* RETURN: Success
*
* DESCRIPTION: Produce a combined GPE status bits mask for the given block.
*
******************************************************************************/
static acpi_status
acpi_hw_get_gpe_block_status(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
struct acpi_gpe_block_info *gpe_block,
void *ret_ptr)
{
struct acpi_gpe_register_info *gpe_register_info;
u64 in_enable, in_status;
acpi_status status;
u8 *ret = ret_ptr;
u32 i;
/* Examine each GPE Register within the block */
for (i = 0; i < gpe_block->register_count; i++) {
gpe_register_info = &gpe_block->register_info[i];
status = acpi_hw_read(&in_enable,
&gpe_register_info->enable_address);
if (ACPI_FAILURE(status)) {
continue;
}
status = acpi_hw_read(&in_status,
&gpe_register_info->status_address);
if (ACPI_FAILURE(status)) {
continue;
}
*ret |= in_enable & in_status;
}
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_disable_all_gpes
@ -510,4 +557,28 @@ acpi_status acpi_hw_enable_all_wakeup_gpes(void)
return_ACPI_STATUS(status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_check_all_gpes
*
* PARAMETERS: None
*
* RETURN: Combined status of all GPEs
*
* DESCRIPTION: Check all enabled GPEs in all GPE blocks and return TRUE if the
* status bit is set for at least one of them of FALSE otherwise.
*
******************************************************************************/
u8 acpi_hw_check_all_gpes(void)
{
u8 ret = 0;
ACPI_FUNCTION_TRACE(acpi_hw_check_all_gpes);
(void)acpi_ev_walk_gpe_list(acpi_hw_get_gpe_block_status, &ret);
return (ret != 0);
}
#endif /* !ACPI_REDUCED_HARDWARE */

44
drivers/acpi/ec.c
View File

@ -179,6 +179,7 @@ EXPORT_SYMBOL(first_ec);
static struct acpi_ec *boot_ec;
static bool boot_ec_is_ecdt = false;
static struct workqueue_struct *ec_wq;
static struct workqueue_struct *ec_query_wq;
static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */
@ -469,7 +470,7 @@ static void acpi_ec_submit_query(struct acpi_ec *ec)
ec_dbg_evt("Command(%s) submitted/blocked",
acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY));
ec->nr_pending_queries++;
schedule_work(&ec->work);
queue_work(ec_wq, &ec->work);
}
}
@ -535,7 +536,7 @@ static void acpi_ec_enable_event(struct acpi_ec *ec)
#ifdef CONFIG_PM_SLEEP
static void __acpi_ec_flush_work(void)
{
flush_scheduled_work(); /* flush ec->work */
drain_workqueue(ec_wq); /* flush ec->work */
flush_workqueue(ec_query_wq); /* flush queries */
}
@ -556,8 +557,8 @@ static void acpi_ec_disable_event(struct acpi_ec *ec)
void acpi_ec_flush_work(void)
{
/* Without ec_query_wq there is nothing to flush. */
if (!ec_query_wq)
/* Without ec_wq there is nothing to flush. */
if (!ec_wq)
return;
__acpi_ec_flush_work();
@ -2107,25 +2108,33 @@ static struct acpi_driver acpi_ec_driver = {
.drv.pm = &acpi_ec_pm,
};
static inline int acpi_ec_query_init(void)
static void acpi_ec_destroy_workqueues(void)
{
if (!ec_query_wq) {
ec_query_wq = alloc_workqueue("kec_query", 0,
ec_max_queries);
if (!ec_query_wq)
return -ENODEV;
if (ec_wq) {
destroy_workqueue(ec_wq);
ec_wq = NULL;
}
return 0;
}
static inline void acpi_ec_query_exit(void)
{
if (ec_query_wq) {
destroy_workqueue(ec_query_wq);
ec_query_wq = NULL;
}
}
static int acpi_ec_init_workqueues(void)
{
if (!ec_wq)
ec_wq = alloc_ordered_workqueue("kec", 0);
if (!ec_query_wq)
ec_query_wq = alloc_workqueue("kec_query", 0, ec_max_queries);
if (!ec_wq || !ec_query_wq) {
acpi_ec_destroy_workqueues();
return -ENODEV;
}
return 0;
}
static const struct dmi_system_id acpi_ec_no_wakeup[] = {
{
.ident = "Thinkpad X1 Carbon 6th",
@ -2156,8 +2165,7 @@ int __init acpi_ec_init(void)
int result;
int ecdt_fail, dsdt_fail;
/* register workqueue for _Qxx evaluations */
result = acpi_ec_query_init();
result = acpi_ec_init_workqueues();
if (result)
return result;
@ -2188,6 +2196,6 @@ static void __exit acpi_ec_exit(void)
{
acpi_bus_unregister_driver(&acpi_ec_driver);
acpi_ec_query_exit();
acpi_ec_destroy_workqueues();
}
#endif /* 0 */

50
drivers/acpi/sleep.c
View File

@ -990,21 +990,34 @@ static void acpi_s2idle_sync(void)
acpi_os_wait_events_complete(); /* synchronize Notify handling */
}
static void acpi_s2idle_wake(void)
static bool acpi_s2idle_wake(void)
{
/*
* If IRQD_WAKEUP_ARMED is set for the SCI at this point, the SCI has
* not triggered while suspended, so bail out.
*/
if (!acpi_sci_irq_valid() ||
irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq)))
return;
if (!acpi_sci_irq_valid())
return pm_wakeup_pending();
while (pm_wakeup_pending()) {
/*
* If IRQD_WAKEUP_ARMED is set for the SCI at this point, the
* SCI has not triggered while suspended, so bail out (the
* wakeup is pending anyway and the SCI is not the source of
* it).
*/
if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq)))
return true;
/*
* If there are no EC events to process and at least one of the
* other enabled GPEs is active, the wakeup is regarded as a
* genuine one.
*
* Note that the checks below must be carried out in this order
* to avoid returning prematurely due to a change of the EC GPE
* status bit from unset to set between the checks with the
* status bits of all the other GPEs unset.
*/
if (acpi_any_gpe_status_set() && !acpi_ec_dispatch_gpe())
return true;
/*
* If there are EC events to process, the wakeup may be a spurious one
* coming from the EC.
*/
if (acpi_ec_dispatch_gpe()) {
/*
* Cancel the wakeup and process all pending events in case
* there are any wakeup ones in there.
@ -1017,8 +1030,19 @@ static void acpi_s2idle_wake(void)
acpi_s2idle_sync();
/*
* The SCI is in the "suspended" state now and it cannot produce
* new wakeup events till the rearming below, so if any of them
* are pending here, they must be resulting from the processing
* of EC events above or coming from somewhere else.
*/
if (pm_wakeup_pending())
return true;
rearm_wake_irq(acpi_sci_irq);
}
return false;
}
static void acpi_s2idle_restore_early(void)

5
drivers/cpufreq/cpufreq.c
View File

@ -105,6 +105,8 @@ bool have_governor_per_policy(void)
}
EXPORT_SYMBOL_GPL(have_governor_per_policy);
static struct kobject *cpufreq_global_kobject;
struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy)
{
if (have_governor_per_policy())
@ -2745,9 +2747,6 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver)
}
EXPORT_SYMBOL_GPL(cpufreq_unregister_driver);
struct kobject *cpufreq_global_kobject;
EXPORT_SYMBOL(cpufreq_global_kobject);
static int __init cpufreq_core_init(void)
{
if (cpufreq_disabled())

1
include/acpi/acpixf.h
View File

@ -752,6 +752,7 @@ ACPI_HW_DEPENDENT_RETURN_UINT32(u32 acpi_dispatch_gpe(acpi_handle gpe_device, u3
ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status acpi_disable_all_gpes(void))
ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status acpi_enable_all_runtime_gpes(void))
ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status acpi_enable_all_wakeup_gpes(void))
ACPI_HW_DEPENDENT_RETURN_UINT32(u32 acpi_any_gpe_status_set(void))
ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status
acpi_get_gpe_device(u32 gpe_index,

3
include/linux/cpufreq.h
View File

@ -201,9 +201,6 @@ static inline bool policy_is_shared(struct cpufreq_policy *policy)
return cpumask_weight(policy->cpus) > 1;
}
/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
extern struct kobject *cpufreq_global_kobject;
#ifdef CONFIG_CPU_FREQ
unsigned int cpufreq_get(unsigned int cpu);
unsigned int cpufreq_quick_get(unsigned int cpu);

2
include/linux/suspend.h
View File

@ -191,7 +191,7 @@ struct platform_s2idle_ops {
int (*begin)(void);
int (*prepare)(void);
int (*prepare_late)(void);
void (*wake)(void);
bool (*wake)(void);
void (*restore_early)(void);
void (*restore)(void);
void (*end)(void);

9
kernel/power/suspend.c
View File

@ -131,11 +131,12 @@ static void s2idle_loop(void)
* to avoid them upfront.
*/
for (;;) {
if (s2idle_ops && s2idle_ops->wake)
s2idle_ops->wake();
if (pm_wakeup_pending())
if (s2idle_ops && s2idle_ops->wake) {
if (s2idle_ops->wake())
break;
} else if (pm_wakeup_pending()) {
break;
}
pm_wakeup_clear(false);