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Subject[PATCH 1/2] ACPICA: Allow acpi_any_gpe_status_set() to skip one GPE
Date
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

The check carried out by acpi_any_gpe_status_set() is not precise enough
for the suspend-to-idle implementation in Linux and in some cases it is
necessary make it skip one GPE (specifically, the EC GPE) from the check
to prevent a race condition leading to a premature system resume from
occurring.

For this reason, redefine acpi_any_gpe_status_set() to take the number
of a GPE to skip as an argument.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=206629
Tested-by: Ondřej Caletka <ondrej@caletka.cz>
Cc: 5.4+ <stable@vger.kernel.org> # 5.4+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
drivers/acpi/acpica/achware.h | 2 +-
drivers/acpi/acpica/evxfgpe.c | 17 +++++++++++-----
drivers/acpi/acpica/hwgpe.c | 47 ++++++++++++++++++++++++++++++++++---------
drivers/acpi/sleep.c | 2 +-
include/acpi/acpixf.h | 2 +-
5 files changed, 53 insertions(+), 17 deletions(-)

diff --git a/drivers/acpi/acpica/achware.h b/drivers/acpi/acpica/achware.h
index 6ad0517553d5..ebf6453d0e21 100644
--- a/drivers/acpi/acpica/achware.h
+++ b/drivers/acpi/acpica/achware.h
@@ -101,7 +101,7 @@ 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);
+u8 acpi_hw_check_all_gpes(acpi_handle gpe_skip_device, u32 gpe_skip_number);

acpi_status
acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
diff --git a/drivers/acpi/acpica/evxfgpe.c b/drivers/acpi/acpica/evxfgpe.c
index f2de66bfd8a7..3be60673e461 100644
--- a/drivers/acpi/acpica/evxfgpe.c
+++ b/drivers/acpi/acpica/evxfgpe.c
@@ -799,17 +799,19 @@ ACPI_EXPORT_SYMBOL(acpi_enable_all_wakeup_gpes)
*
* FUNCTION: acpi_any_gpe_status_set
*
- * PARAMETERS: None
+ * PARAMETERS: gpe_skip_number - Number of the GPE to skip
*
* 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.
+ * DESCRIPTION: Check the status bits of all enabled GPEs, except for the one
+ * represented by the "skip" argument, and return TRUE if any of
+ * them is set or FALSE otherwise.
*
******************************************************************************/
-u32 acpi_any_gpe_status_set(void)
+u32 acpi_any_gpe_status_set(u32 gpe_skip_number)
{
acpi_status status;
+ acpi_handle gpe_device;
u8 ret;

ACPI_FUNCTION_TRACE(acpi_any_gpe_status_set);
@@ -819,7 +821,12 @@ u32 acpi_any_gpe_status_set(void)
return (FALSE);
}

- ret = acpi_hw_check_all_gpes();
+ status = acpi_get_gpe_device(gpe_skip_number, &gpe_device);
+ if (ACPI_FAILURE(status)) {
+ gpe_device = NULL;
+ }
+
+ ret = acpi_hw_check_all_gpes(gpe_device, gpe_skip_number);
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);

return (ret);
diff --git a/drivers/acpi/acpica/hwgpe.c b/drivers/acpi/acpica/hwgpe.c
index f4c285c2f595..49c46d4dd070 100644
--- a/drivers/acpi/acpica/hwgpe.c
+++ b/drivers/acpi/acpica/hwgpe.c
@@ -444,12 +444,19 @@ acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
return (AE_OK);
}

+struct acpi_gpe_block_status_context {
+ struct acpi_gpe_register_info *gpe_skip_register_info;
+ u8 gpe_skip_mask;
+ u8 retval;
+};
+
/******************************************************************************
*
* FUNCTION: acpi_hw_get_gpe_block_status
*
* PARAMETERS: gpe_xrupt_info - GPE Interrupt info
* gpe_block - Gpe Block info
+ * context - GPE list walk context data
*
* RETURN: Success
*
@@ -460,12 +467,13 @@ acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
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)
+ void *context)
{
+ struct acpi_gpe_block_status_context *c = context;
struct acpi_gpe_register_info *gpe_register_info;
u64 in_enable, in_status;
acpi_status status;
- u8 *ret = ret_ptr;
+ u8 ret_mask;
u32 i;

/* Examine each GPE Register within the block */
@@ -485,7 +493,11 @@ acpi_hw_get_gpe_block_status(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
continue;
}

- *ret |= in_enable & in_status;
+ ret_mask = in_enable & in_status;
+ if (ret_mask && c->gpe_skip_register_info == gpe_register_info) {
+ ret_mask &= ~c->gpe_skip_mask;
+ }
+ c->retval |= ret_mask;
}

return (AE_OK);
@@ -561,24 +573,41 @@ acpi_status acpi_hw_enable_all_wakeup_gpes(void)
*
* FUNCTION: acpi_hw_check_all_gpes
*
- * PARAMETERS: None
+ * PARAMETERS: gpe_skip_device - GPE devoce of the GPE to skip
+ * gpe_skip_number - Number of the GPE to skip
*
* RETURN: Combined status of all GPEs
*
- * DESCRIPTION: Check all enabled GPEs in all GPE blocks and return TRUE if the
+ * DESCRIPTION: Check all enabled GPEs in all GPE blocks, except for the one
+ * represented by the "skip" arguments, 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 acpi_hw_check_all_gpes(acpi_handle gpe_skip_device, u32 gpe_skip_number)
{
- u8 ret = 0;
+ struct acpi_gpe_block_status_context context = {
+ .gpe_skip_register_info = NULL,
+ .retval = 0,
+ };
+ struct acpi_gpe_event_info *gpe_event_info;
+ acpi_cpu_flags flags;

ACPI_FUNCTION_TRACE(acpi_hw_check_all_gpes);

- (void)acpi_ev_walk_gpe_list(acpi_hw_get_gpe_block_status, &ret);
+ flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+
+ gpe_event_info = acpi_ev_get_gpe_event_info(gpe_skip_device,
+ gpe_skip_number);
+ if (gpe_event_info) {
+ context.gpe_skip_register_info = gpe_event_info->register_info;
+ context.gpe_skip_mask = acpi_hw_get_gpe_register_bit(gpe_event_info);
+ }
+
+ acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

- return (ret != 0);
+ (void)acpi_ev_walk_gpe_list(acpi_hw_get_gpe_block_status, &context);
+ return (context.retval != 0);
}

#endif /* !ACPI_REDUCED_HARDWARE */
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index e5f95922bc21..857a6165c534 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -1022,7 +1022,7 @@ static bool acpi_s2idle_wake(void)
* 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())
+ if (acpi_any_gpe_status_set(U32_MAX) && !acpi_ec_dispatch_gpe())
return true;

/*
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index 8e8be989c2a6..a50d6dea44c3 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -752,7 +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_UINT32(u32 acpi_any_gpe_status_set(u32 gpe_skip_number))
ACPI_HW_DEPENDENT_RETURN_UINT32(u32 acpi_any_fixed_event_status_set(void))

ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status
--
2.16.4



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