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authorRafael J. Wysocki <rjw@sisk.pl>2010-09-16 00:30:43 +0200
committerLen Brown <len.brown@intel.com>2010-09-24 16:55:47 -0400
commita210080195c95ebca2a517ee3057d71607aa65e0 (patch)
tree96aa2aee4b9bdbc747b7a0d7150d0b41650ebe90
parent2422084a94fcd5038406261b331672a13c92c050 (diff)
downloadlinux-linaro-android-a210080195c95ebca2a517ee3057d71607aa65e0.tar.gz
ACPI / ACPICA: Defer enabling of runtime GPEs (v3)
The current ACPI GPEs initialization code has a problem that it enables some GPEs pointed to by device _PRW methods, generally intended for signaling wakeup events (system or device wakeup). These GPEs are then almost immediately disabled by the ACPI namespace scanning code with the help of acpi_gpe_can_wake(), but it would be better not to enable them at all until really necessary. Modify the initialization of GPEs so that the ones that have associated _Lxx or _Exx methods and are not pointed to by any _PRW methods will be enabled after the namespace scan is complete. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com>
-rw-r--r--drivers/acpi/acpica/acevents.h5
-rw-r--r--drivers/acpi/acpica/acglobal.h1
-rw-r--r--drivers/acpi/acpica/aclocal.h3
-rw-r--r--drivers/acpi/acpica/evevent.c41
-rw-r--r--drivers/acpi/acpica/evgpeblk.c47
-rw-r--r--drivers/acpi/acpica/evgpeinit.c31
-rw-r--r--drivers/acpi/acpica/evxface.c19
-rw-r--r--drivers/acpi/acpica/evxfevnt.c61
-rw-r--r--drivers/acpi/acpica/utglobal.c1
-rw-r--r--drivers/acpi/acpica/utxface.c13
-rw-r--r--drivers/acpi/dock.c1
-rw-r--r--drivers/acpi/scan.c9
-rw-r--r--include/acpi/acpixf.h2
13 files changed, 94 insertions, 140 deletions
diff --git a/drivers/acpi/acpica/acevents.h b/drivers/acpi/acpica/acevents.h
index 36867cd70ea..a6f99cc37a1 100644
--- a/drivers/acpi/acpica/acevents.h
+++ b/drivers/acpi/acpica/acevents.h
@@ -105,8 +105,9 @@ acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
struct acpi_gpe_block_info **return_gpe_block);
acpi_status
-acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
- struct acpi_gpe_block_info *gpe_block);
+acpi_ev_initialize_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
+ struct acpi_gpe_block_info *gpe_block,
+ void *ignored);
acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block);
diff --git a/drivers/acpi/acpica/acglobal.h b/drivers/acpi/acpica/acglobal.h
index 1d192142c69..c1a6a6744ae 100644
--- a/drivers/acpi/acpica/acglobal.h
+++ b/drivers/acpi/acpica/acglobal.h
@@ -364,6 +364,7 @@ ACPI_EXTERN struct acpi_fixed_event_handler
ACPI_EXTERN struct acpi_gpe_xrupt_info *acpi_gbl_gpe_xrupt_list_head;
ACPI_EXTERN struct acpi_gpe_block_info
*acpi_gbl_gpe_fadt_blocks[ACPI_MAX_GPE_BLOCKS];
+ACPI_EXTERN u8 acpi_all_gpes_initialized;
/*****************************************************************************
*
diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h
index df85b53a674..5e044910609 100644
--- a/drivers/acpi/acpica/aclocal.h
+++ b/drivers/acpi/acpica/aclocal.h
@@ -413,6 +413,7 @@ struct acpi_handler_info {
void *context; /* Context to be passed to handler */
struct acpi_namespace_node *method_node; /* Method node for this GPE level (saved) */
u8 orig_flags; /* Original misc info about this GPE */
+ u8 orig_enabled; /* Set if the GPE was originally enabled */
};
union acpi_gpe_dispatch_info {
@@ -457,6 +458,7 @@ struct acpi_gpe_block_info {
u32 register_count; /* Number of register pairs in block */
u16 gpe_count; /* Number of individual GPEs in block */
u8 block_base_number; /* Base GPE number for this block */
+ u8 initialized; /* If set, the GPE block has been initialized */
};
/* Information about GPE interrupt handlers, one per each interrupt level used for GPEs */
@@ -473,7 +475,6 @@ struct acpi_gpe_walk_info {
struct acpi_gpe_block_info *gpe_block;
u16 count;
acpi_owner_id owner_id;
- u8 enable_this_gpe;
u8 execute_by_owner_id;
};
diff --git a/drivers/acpi/acpica/evevent.c b/drivers/acpi/acpica/evevent.c
index 303618889da..c61c3039c31 100644
--- a/drivers/acpi/acpica/evevent.c
+++ b/drivers/acpi/acpica/evevent.c
@@ -95,47 +95,6 @@ acpi_status acpi_ev_initialize_events(void)
/*******************************************************************************
*
- * FUNCTION: acpi_ev_install_fadt_gpes
- *
- * PARAMETERS: None
- *
- * RETURN: Status
- *
- * DESCRIPTION: Completes initialization of the FADT-defined GPE blocks
- * (0 and 1). The HW must be fully initialized at this point,
- * including global lock support.
- *
- ******************************************************************************/
-
-acpi_status acpi_ev_install_fadt_gpes(void)
-{
- acpi_status status;
-
- ACPI_FUNCTION_TRACE(ev_install_fadt_gpes);
-
- /* Namespace must be locked */
-
- status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
- if (ACPI_FAILURE(status)) {
- return (status);
- }
-
- /* FADT GPE Block 0 */
-
- (void)acpi_ev_initialize_gpe_block(acpi_gbl_fadt_gpe_device,
- acpi_gbl_gpe_fadt_blocks[0]);
-
- /* FADT GPE Block 1 */
-
- (void)acpi_ev_initialize_gpe_block(acpi_gbl_fadt_gpe_device,
- acpi_gbl_gpe_fadt_blocks[1]);
-
- (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
- return_ACPI_STATUS(AE_OK);
-}
-
-/*******************************************************************************
- *
* FUNCTION: acpi_ev_install_xrupt_handlers
*
* PARAMETERS: None
diff --git a/drivers/acpi/acpica/evgpeblk.c b/drivers/acpi/acpica/evgpeblk.c
index 85445fb5844..020add3eee1 100644
--- a/drivers/acpi/acpica/evgpeblk.c
+++ b/drivers/acpi/acpica/evgpeblk.c
@@ -363,6 +363,7 @@ acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
gpe_block->gpe_count = (u16)(register_count * ACPI_GPE_REGISTER_WIDTH);
gpe_block->register_count = register_count;
gpe_block->block_base_number = gpe_block_base_number;
+ gpe_block->initialized = FALSE;
ACPI_MEMCPY(&gpe_block->block_address, gpe_block_address,
sizeof(struct acpi_generic_address));
@@ -385,11 +386,12 @@ acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
return_ACPI_STATUS(status);
}
+ acpi_all_gpes_initialized = FALSE;
+
/* Find all GPE methods (_Lxx or_Exx) for this block */
walk_info.gpe_block = gpe_block;
walk_info.gpe_device = gpe_device;
- walk_info.enable_this_gpe = FALSE;
walk_info.execute_by_owner_id = FALSE;
status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
@@ -434,35 +436,34 @@ acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
******************************************************************************/
acpi_status
-acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
- struct acpi_gpe_block_info *gpe_block)
+acpi_ev_initialize_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
+ struct acpi_gpe_block_info *gpe_block,
+ void *ignored)
{
acpi_status status;
struct acpi_gpe_event_info *gpe_event_info;
u32 gpe_enabled_count;
u32 gpe_index;
- u32 gpe_number;
u32 i;
u32 j;
ACPI_FUNCTION_TRACE(ev_initialize_gpe_block);
- /* Ignore a null GPE block (e.g., if no GPE block 1 exists) */
-
- if (!gpe_block) {
+ /*
+ * Ignore a null GPE block (e.g., if no GPE block 1 exists) and
+ * GPE blocks that have been initialized already.
+ */
+ if (!gpe_block || gpe_block->initialized) {
return_ACPI_STATUS(AE_OK);
}
/*
- * Enable all GPEs that have a corresponding method. Any other GPEs
- * within this block must be enabled via the acpi_enable_gpe interface.
+ * Enable all GPEs that have a corresponding method and have the
+ * ACPI_GPE_CAN_WAKE flag unset. Any other GPEs within this block must
+ * be enabled via the acpi_enable_gpe() interface.
*/
gpe_enabled_count = 0;
- if (gpe_device == acpi_gbl_fadt_gpe_device) {
- gpe_device = NULL;
- }
-
for (i = 0; i < gpe_block->register_count; i++) {
for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
@@ -470,27 +471,19 @@ acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
gpe_index = (i * ACPI_GPE_REGISTER_WIDTH) + j;
gpe_event_info = &gpe_block->event_info[gpe_index];
- gpe_number = gpe_index + gpe_block->block_base_number;
/* Ignore GPEs that have no corresponding _Lxx/_Exx method */
- if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_METHOD)) {
+ if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_METHOD)
+ || (gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
continue;
}
- /*
- * If the GPE has already been enabled for runtime
- * signaling, make sure it remains enabled, but do not
- * increment its reference counter.
- */
- status = gpe_event_info->runtime_count ?
- acpi_ev_enable_gpe(gpe_event_info) :
- acpi_enable_gpe(gpe_device, gpe_number);
-
+ status = acpi_raw_enable_gpe(gpe_event_info);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
- "Could not enable GPE 0x%02X",
- gpe_number));
+ "Could not enable GPE 0x%02X",
+ gpe_index + gpe_block->block_base_number));
continue;
}
@@ -504,5 +497,7 @@ acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
gpe_enabled_count));
}
+ gpe_block->initialized = TRUE;
+
return_ACPI_STATUS(AE_OK);
}
diff --git a/drivers/acpi/acpica/evgpeinit.c b/drivers/acpi/acpica/evgpeinit.c
index 3084c5de1bb..2c7def95f72 100644
--- a/drivers/acpi/acpica/evgpeinit.c
+++ b/drivers/acpi/acpica/evgpeinit.c
@@ -210,8 +210,7 @@ acpi_status acpi_ev_gpe_initialize(void)
*
* DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a
* result of a Load() or load_table() operation. If new GPE
- * methods have been installed, register the new methods and
- * enable and runtime GPEs that are associated with them.
+ * methods have been installed, register the new methods.
*
******************************************************************************/
@@ -239,7 +238,6 @@ void acpi_ev_update_gpes(acpi_owner_id table_owner_id)
walk_info.owner_id = table_owner_id;
walk_info.execute_by_owner_id = TRUE;
walk_info.count = 0;
- walk_info.enable_this_gpe = TRUE;
/* Walk the interrupt level descriptor list */
@@ -301,8 +299,6 @@ void acpi_ev_update_gpes(acpi_owner_id table_owner_id)
*
* If walk_info->execute_by_owner_id is TRUE, we only execute examine GPE methods
* with that owner.
- * If walk_info->enable_this_gpe is TRUE, the GPE that is referred to by a GPE
- * method is immediately enabled (Used for Load/load_table operators)
*
******************************************************************************/
@@ -315,8 +311,6 @@ acpi_ev_match_gpe_method(acpi_handle obj_handle,
struct acpi_gpe_walk_info *walk_info =
ACPI_CAST_PTR(struct acpi_gpe_walk_info, context);
struct acpi_gpe_event_info *gpe_event_info;
- struct acpi_namespace_node *gpe_device;
- acpi_status status;
u32 gpe_number;
char name[ACPI_NAME_SIZE + 1];
u8 type;
@@ -421,29 +415,6 @@ acpi_ev_match_gpe_method(acpi_handle obj_handle,
gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_METHOD);
gpe_event_info->dispatch.method_node = method_node;
- /*
- * Enable this GPE if requested. This only happens when during the
- * execution of a Load or load_table operator. We have found a new
- * GPE method and want to immediately enable the GPE if it is a
- * runtime GPE.
- */
- if (walk_info->enable_this_gpe) {
-
- walk_info->count++;
- gpe_device = walk_info->gpe_device;
-
- if (gpe_device == acpi_gbl_fadt_gpe_device) {
- gpe_device = NULL;
- }
-
- status = acpi_enable_gpe(gpe_device, gpe_number);
- if (ACPI_FAILURE(status)) {
- ACPI_EXCEPTION((AE_INFO, status,
- "Could not enable GPE 0x%02X",
- gpe_number));
- }
- }
-
ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
"Registered GPE method %s as GPE number 0x%.2X\n",
name, gpe_number));
diff --git a/drivers/acpi/acpica/evxface.c b/drivers/acpi/acpica/evxface.c
index 14e48add32f..36af222cac6 100644
--- a/drivers/acpi/acpica/evxface.c
+++ b/drivers/acpi/acpica/evxface.c
@@ -726,15 +726,16 @@ acpi_install_gpe_handler(acpi_handle gpe_device,
(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
/*
- * If the GPE is associated with a method and it cannot wake up the
- * system from sleep states, it was enabled automatically during
- * initialization, so it has to be disabled now to avoid spurious
- * execution of the handler.
+ * If the GPE is associated with a method, it might have been enabled
+ * automatically during initialization, in which case it has to be
+ * disabled now to avoid spurious execution of the handler.
*/
if ((handler->orig_flags & ACPI_GPE_DISPATCH_METHOD)
- && !(gpe_event_info->flags & ACPI_GPE_CAN_WAKE))
+ && gpe_event_info->runtime_count) {
+ handler->orig_enabled = 1;
(void)acpi_raw_disable_gpe(gpe_event_info);
+ }
/* Install the handler */
@@ -837,13 +838,13 @@ acpi_remove_gpe_handler(acpi_handle gpe_device,
gpe_event_info->flags |= handler->orig_flags;
/*
- * If the GPE was previously associated with a method and it cannot wake
- * up the system from sleep states, it should be enabled at this point
- * to restore the post-initialization configuration.
+ * If the GPE was previously associated with a method and it was
+ * enabled, it should be enabled at this point to restore the
+ * post-initialization configuration.
*/
if ((handler->orig_flags & ACPI_GPE_DISPATCH_METHOD)
- && !(gpe_event_info->flags & ACPI_GPE_CAN_WAKE))
+ && handler->orig_enabled)
(void)acpi_raw_enable_gpe(gpe_event_info);
/* Now we can free the handler object */
diff --git a/drivers/acpi/acpica/evxfevnt.c b/drivers/acpi/acpica/evxfevnt.c
index 304825528d4..a1dabe3fd8a 100644
--- a/drivers/acpi/acpica/evxfevnt.c
+++ b/drivers/acpi/acpica/evxfevnt.c
@@ -379,21 +379,12 @@ acpi_status acpi_gpe_can_wake(acpi_handle gpe_device, u32 gpe_number)
/* Ensure that we have a valid GPE number */
gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
- if (!gpe_event_info) {
+ if (gpe_event_info) {
+ gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
+ } else {
status = AE_BAD_PARAMETER;
- goto unlock_and_exit;
- }
-
- if (gpe_event_info->flags & ACPI_GPE_CAN_WAKE) {
- goto unlock_and_exit;
}
- gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
- if (gpe_event_info->flags & ACPI_GPE_DISPATCH_METHOD) {
- (void)acpi_raw_disable_gpe(gpe_event_info);
- }
-
-unlock_and_exit:
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
return_ACPI_STATUS(status);
}
@@ -651,7 +642,7 @@ acpi_install_gpe_block(acpi_handle gpe_device,
struct acpi_generic_address *gpe_block_address,
u32 register_count, u32 interrupt_number)
{
- acpi_status status;
+ acpi_status status = AE_OK;
union acpi_operand_object *obj_desc;
struct acpi_namespace_node *node;
struct acpi_gpe_block_info *gpe_block;
@@ -715,10 +706,6 @@ acpi_install_gpe_block(acpi_handle gpe_device,
obj_desc->device.gpe_block = gpe_block;
- /* Enable the runtime GPEs in the new block */
-
- status = acpi_ev_initialize_gpe_block(node, gpe_block);
-
unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return_ACPI_STATUS(status);
@@ -924,3 +911,43 @@ acpi_status acpi_enable_all_runtime_gpes(void)
return_ACPI_STATUS(status);
}
+
+/******************************************************************************
+ *
+ * FUNCTION: acpi_update_gpes
+ *
+ * PARAMETERS: None
+ *
+ * RETURN: None
+ *
+ * DESCRIPTION: Enable all GPEs that have associated _Lxx or _Exx methods and
+ * are not pointed to by any device _PRW methods indicating that
+ * these GPEs are generally intended for system or device wakeup
+ * (such GPEs have to be enabled directly when the devices whose
+ * _PRW methods point to them are set up for wakeup signaling).
+ *
+ ******************************************************************************/
+
+acpi_status acpi_update_gpes(void)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(acpi_update_gpes);
+
+ status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ } else if (acpi_all_gpes_initialized) {
+ goto unlock;
+ }
+
+ status = acpi_ev_walk_gpe_list(acpi_ev_initialize_gpe_block, NULL);
+ if (ACPI_SUCCESS(status)) {
+ acpi_all_gpes_initialized = TRUE;
+ }
+
+unlock:
+ (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
+
+ return_ACPI_STATUS(status);
+}
diff --git a/drivers/acpi/acpica/utglobal.c b/drivers/acpi/acpica/utglobal.c
index 0558747579e..75faf6790e5 100644
--- a/drivers/acpi/acpica/utglobal.c
+++ b/drivers/acpi/acpica/utglobal.c
@@ -766,6 +766,7 @@ acpi_status acpi_ut_init_globals(void)
acpi_gbl_gpe_fadt_blocks[0] = NULL;
acpi_gbl_gpe_fadt_blocks[1] = NULL;
acpi_current_gpe_count = 0;
+ acpi_all_gpes_initialized = FALSE;
/* Global handlers */
diff --git a/drivers/acpi/acpica/utxface.c b/drivers/acpi/acpica/utxface.c
index 7f8cefcb2b3..16cc48c2744 100644
--- a/drivers/acpi/acpica/utxface.c
+++ b/drivers/acpi/acpica/utxface.c
@@ -290,19 +290,6 @@ acpi_status acpi_initialize_objects(u32 flags)
}
/*
- * Complete the GPE initialization for the GPE blocks defined in the FADT
- * (GPE block 0 and 1).
- *
- * NOTE: Currently, there seems to be no need to run the _REG methods
- * before enabling the GPEs.
- */
- if (!(flags & ACPI_NO_EVENT_INIT)) {
- status = acpi_ev_install_fadt_gpes();
- if (ACPI_FAILURE(status))
- return (status);
- }
-
- /*
* Empty the caches (delete the cached objects) on the assumption that
* the table load filled them up more than they will be at runtime --
* thus wasting non-paged memory.
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 3fe29e992be..44f99bd8374 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -725,6 +725,7 @@ static void dock_notify(acpi_handle handle, u32 event, void *data)
complete_dock(ds);
dock_event(ds, event, DOCK_EVENT);
dock_lock(ds, 1);
+ acpi_update_gpes();
break;
}
if (dock_present(ds) || dock_in_progress(ds))
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index b23825ecfa3..f87f04603b6 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1431,6 +1431,7 @@ EXPORT_SYMBOL(acpi_bus_add);
int acpi_bus_start(struct acpi_device *device)
{
struct acpi_bus_ops ops;
+ int result;
if (!device)
return -EINVAL;
@@ -1438,7 +1439,11 @@ int acpi_bus_start(struct acpi_device *device)
memset(&ops, 0, sizeof(ops));
ops.acpi_op_start = 1;
- return acpi_bus_scan(device->handle, &ops, NULL);
+ result = acpi_bus_scan(device->handle, &ops, NULL);
+
+ acpi_update_gpes();
+
+ return result;
}
EXPORT_SYMBOL(acpi_bus_start);
@@ -1552,6 +1557,8 @@ int __init acpi_scan_init(void)
if (result)
acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
+ else
+ acpi_update_gpes();
return result;
}
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index c0786d446a0..87b0f31d18f 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -308,6 +308,8 @@ acpi_install_gpe_block(acpi_handle gpe_device,
acpi_status acpi_remove_gpe_block(acpi_handle gpe_device);
+acpi_status acpi_update_gpes(void);
+
/*
* Resource interfaces
*/