ACPICA: Introduce acpi_any_gpe_status_set()

Introduce a new helper function, acpi_any_gpe_status_set(), for
checking the status bits of all enabled GPEs in one go.

It is needed to distinguish spurious SCIs from genuine ones when
deciding whether or not to wake up the system from suspend-to-idle.

Cc: 5.4+ <stable@vger.kernel.org> # 5.4+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/acpica/achware.h b/drivers/acpi/acpica/achware.h
index 67f282e..6ad0517 100644 (file)
--- a/drivers/acpi/acpica/achware.h
+++ b/drivers/acpi/acpica/achware.h
@@ -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,

diff --git a/drivers/acpi/acpica/evxfgpe.c b/drivers/acpi/acpica/evxfgpe.c
index 2c39ff2..f2de66b 100644 (file)
--- a/drivers/acpi/acpica/evxfgpe.c
+++ b/drivers/acpi/acpica/evxfgpe.c
@@ -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

diff --git a/drivers/acpi/acpica/hwgpe.c b/drivers/acpi/acpica/hwgpe.c
index 1b4252b..f4c285c 100644 (file)
--- a/drivers/acpi/acpica/hwgpe.c
+++ b/drivers/acpi/acpica/hwgpe.c
@@ -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 */

diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index 00994b1..5867777 100644 (file)
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -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,