On Monday, August 30, 2010, Bjorn Helgaas wrote:
> On Saturday, August 28, 2010 05:10:56 pm Rafael J. Wysocki wrote:
> > Bob, Matthew,
> >
> > The patch below implements the idea we've been recently discussing off-list,
> > to only enable "runtime" GPEs after the ACPI namespace have been scanned and
> > we know what GPEs are pointed to by _PRW methods.
> >
> > It is on top of the current mainline Linux kernel (2.6.36-rc2+) which contains
> > my patches that removed the _PRW scan from the ACPICA code and modified
> > the GPE handler installation/removal.
> >
> > Fortunately, the patch turns out to be rather straightforward, although I have
> > one reservation. Namely, I'm not sure if any GPEs can be added after
> > acpi_scan_init() has returned, in which case we may want to enable them
> > as soon as they are found and some code to do that will be necessary.
>
> Isn't it possible (at least in theory) to hot-add an ACPI0006 GPE Block
> Device after acpi_scan_init()?
Yes, in theory it is possible, but I'm not sure we handle that at all.
Just in case, though, I reworked the patch so that the "hot-added" GPEs
are automatically enabled if they are added after the initial namespace scan.
The new version is appended.
> > ---
> > From: Rafael J. Wysocki <rjw@xxxxxxx>
> > Subject: ACPI / ACPICA: Defer enabling of runtime GPEs
> >
> > The current ACPI GPEs initialization code has a problem that it
> > enables some GPEs pointed to by device _PRW methods and are 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 no to enable them at all until really necessary.
>
> Typo: ^ I think you meant "not"
That's correct, thanks. It's fixed in the changelog below.
> > 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@xxxxxxx>
Thanks,
Rafael
---
From: Rafael J. Wysocki <rjw@xxxxxxx>
Subject: ACPI / ACPICA: Defer enabling of runtime GPEs (v2)
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@xxxxxxx>
---
drivers/acpi/acpica/acevents.h | 5 ++-
drivers/acpi/acpica/acglobal.h | 1
drivers/acpi/acpica/aclocal.h | 1
drivers/acpi/acpica/evevent.c | 41 -----------------------------
drivers/acpi/acpica/evgpeblk.c | 33 +++++++----------------
drivers/acpi/acpica/evgpeinit.c | 2 -
drivers/acpi/acpica/evxface.c | 19 +++++++------
drivers/acpi/acpica/evxfevnt.c | 56 +++++++++++++++++++++++++++-------------
drivers/acpi/acpica/utglobal.c | 1
drivers/acpi/acpica/utxface.c | 13 ---------
drivers/acpi/bus.c | 1
include/acpi/acpixf.h | 2 +
12 files changed, 70 insertions(+), 105 deletions(-)
Index: linux-2.6/drivers/acpi/acpica/evxfevnt.c
===================================================================
--- linux-2.6.orig/drivers/acpi/acpica/evxfevnt.c
+++ linux-2.6/drivers/acpi/acpica/evxfevnt.c
@@ -379,21 +379,12 @@ acpi_status acpi_gpe_can_wake(acpi_handl
/* 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_d
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_d
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 +911,38 @@ acpi_status acpi_enable_all_runtime_gpes
return_ACPI_STATUS(status);
}
+
+/******************************************************************************
+ *
+ * FUNCTION: acpi_start_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_start_gpes(void)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(acpi_start_gpes);
+
+ status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ acpi_auto_enable_gpes = TRUE;
+ status = acpi_ev_walk_gpe_list(acpi_ev_initialize_gpe_block, NULL);
+
+ (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
+
+ return_ACPI_STATUS(status);
+}
Index: linux-2.6/drivers/acpi/acpica/acevents.h
===================================================================
--- linux-2.6.orig/drivers/acpi/acpica/acevents.h
+++ linux-2.6/drivers/acpi/acpica/acevents.h
@@ -105,8 +105,9 @@ acpi_ev_create_gpe_block(struct acpi_nam
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);
Index: linux-2.6/drivers/acpi/acpica/evgpeblk.c
===================================================================
--- linux-2.6.orig/drivers/acpi/acpica/evgpeblk.c
+++ linux-2.6/drivers/acpi/acpica/evgpeblk.c
@@ -434,14 +434,14 @@ acpi_ev_create_gpe_block(struct acpi_nam
******************************************************************************/
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;
@@ -454,15 +454,12 @@ acpi_ev_initialize_gpe_block(struct acpi
}
/*
- * 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 +467,19 @@ acpi_ev_initialize_gpe_block(struct acpi
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;
}
Index: linux-2.6/include/acpi/acpixf.h
===================================================================
--- linux-2.6.orig/include/acpi/acpixf.h
+++ linux-2.6/include/acpi/acpixf.h
@@ -308,6 +308,8 @@ acpi_install_gpe_block(acpi_handle gpe_d
acpi_status acpi_remove_gpe_block(acpi_handle gpe_device);
+acpi_status acpi_start_gpes(void);
+
/*
* Resource interfaces
*/
Index: linux-2.6/drivers/acpi/acpica/aclocal.h
===================================================================
--- linux-2.6.orig/drivers/acpi/acpica/aclocal.h
+++ linux-2.6/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 {
Index: linux-2.6/drivers/acpi/acpica/evevent.c
===================================================================
--- linux-2.6.orig/drivers/acpi/acpica/evevent.c
+++ linux-2.6/drivers/acpi/acpica/evevent.c
@@ -95,47 +95,6 @@ acpi_status acpi_ev_initialize_events(vo
/*******************************************************************************
*
- * 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
Index: linux-2.6/drivers/acpi/acpica/utxface.c
===================================================================
--- linux-2.6.orig/drivers/acpi/acpica/utxface.c
+++ linux-2.6/drivers/acpi/acpica/utxface.c
@@ -290,19 +290,6 @@ acpi_status acpi_initialize_objects(u32
}
/*
- * 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.
Index: linux-2.6/drivers/acpi/bus.c
===================================================================
--- linux-2.6.orig/drivers/acpi/bus.c
+++ linux-2.6/drivers/acpi/bus.c
@@ -1032,6 +1032,7 @@ static int __init acpi_init(void)
dmi_check_system(power_nocheck_dmi_table);
acpi_scan_init();
+ acpi_start_gpes();
acpi_ec_init();
acpi_power_init();
acpi_sysfs_init();
Index: linux-2.6/drivers/acpi/acpica/evxface.c
===================================================================
--- linux-2.6.orig/drivers/acpi/acpica/evxface.c
+++ linux-2.6/drivers/acpi/acpica/evxface.c
@@ -793,15 +793,16 @@ acpi_install_gpe_handler(acpi_handle gpe
(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 */
@@ -904,13 +905,13 @@ acpi_remove_gpe_handler(acpi_handle gpe_
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 */
Index: linux-2.6/drivers/acpi/acpica/acglobal.h
===================================================================
--- linux-2.6.orig/drivers/acpi/acpica/acglobal.h
+++ linux-2.6/drivers/acpi/acpica/acglobal.h
@@ -364,6 +364,7 @@ ACPI_EXTERN struct acpi_fixed_event_hand
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_auto_enable_gpes;
/*****************************************************************************
*
Index: linux-2.6/drivers/acpi/acpica/utglobal.c
===================================================================
--- linux-2.6.orig/drivers/acpi/acpica/utglobal.c
+++ linux-2.6/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_auto_enable_gpes = FALSE;
/* Global handlers */
Index: linux-2.6/drivers/acpi/acpica/evgpeinit.c
===================================================================
--- linux-2.6.orig/drivers/acpi/acpica/evgpeinit.c
+++ linux-2.6/drivers/acpi/acpica/evgpeinit.c
@@ -239,7 +239,7 @@ void acpi_ev_update_gpes(acpi_owner_id t
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_info.enable_this_gpe = acpi_auto_enable_gpes;
/* Walk the interrupt level descriptor list */
--
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