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Commit cbbc0de7 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki Committed by Jesse Barnes
Browse files

ACPI: Use GPE reference counting to support shared GPEs 



To fix a bug and address the reviewers' comments regarding the ACPI
GPE refcounting patch, do the following additional changes:

o Remove the second argument of acpi_ev_enable_gpe(),
  'write_to_hardware', because it is not necessary any more.

o Add the "bad parameter" test against 'type' in
  acpi_enable_gpe() and acpi_disable_gpe().

o Make acpi_enable_gpe() only check 'status' for runtime GPEs if
  acpi_ev_enable_gpe() was actually called.

o Make acpi_disable_gpe() return 'status' returned by
  acpi_ev_disable_gpe() and fix a bug where ACPI_GPE_TYPE_WAKE
  and ACPI_GPE_TYPE_RUNTIME were exchanged by mistake.

o Add comments explaining why acpi_set_gpe() is used by the ACPI EC
  driver.

Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 7bc5e3f2

drivers/acpi/acpica/acevents.h

+1 −3
Original line number Diff line number Diff line
@@ -78,9 +78,7 @@ acpi_ev_queue_notify_request(struct acpi_namespace_node *node, 
acpi_status

acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info);



acpi_status

acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info,

		   u8 write_to_hardware);

acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info);



acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info);

drivers/acpi/acpica/evgpe.c

+3 −7
Original line number Diff line number Diff line
@@ -98,8 +98,6 @@ acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info) 
 * FUNCTION:    acpi_ev_enable_gpe

 *

 * PARAMETERS:  gpe_event_info          - GPE to enable

 *              write_to_hardware       - Enable now, or just mark data structs

 *                                        (WAKE GPEs should be deferred)

 *

 * RETURN:      Status

 *
@@ -107,9 +105,7 @@ acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info) 
 *

 ******************************************************************************/



acpi_status

acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info,

		   u8 write_to_hardware)

acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)

{

	acpi_status status;
@@ -123,7 +119,7 @@ acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info, 


	/* Mark wake-enabled or HW enable, or both */



	if (gpe_event_info->runtime_count && write_to_hardware) {

	if (gpe_event_info->runtime_count) {

		/* Clear the GPE (of stale events), then enable it */

		status = acpi_hw_clear_gpe(gpe_event_info);

		if (ACPI_FAILURE(status))
@@ -400,7 +396,7 @@ static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context) 


	/* Set the GPE flags for return to enabled state */



	(void)acpi_ev_enable_gpe(gpe_event_info, FALSE);

	(void)acpi_ev_update_gpe_enable_masks(gpe_event_info);



	/*

	 * Take a snapshot of the GPE info for this level - we copy the info to

drivers/acpi/acpica/evxfevnt.c

+15 −9
Original line number Diff line number Diff line
@@ -235,7 +235,7 @@ acpi_status acpi_set_gpe(acpi_handle gpe_device, u32 gpe_number, u8 action) 


	switch (action) {

	case ACPI_GPE_ENABLE:

		status = acpi_ev_enable_gpe(gpe_event_info, TRUE);

		status = acpi_ev_enable_gpe(gpe_event_info);

		break;



	case ACPI_GPE_DISABLE:
@@ -276,6 +276,9 @@ acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 type) 


	ACPI_FUNCTION_TRACE(acpi_enable_gpe);



	if (type & ~ACPI_GPE_TYPE_WAKE_RUN)

		return_ACPI_STATUS(AE_BAD_PARAMETER);



	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);



	/* Ensure that we have a valid GPE number */
@@ -287,12 +290,12 @@ acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 type) 
	}



	if (type & ACPI_GPE_TYPE_RUNTIME) {

		if (++gpe_event_info->runtime_count == 1)

			status = acpi_ev_enable_gpe(gpe_event_info, TRUE);



		if (++gpe_event_info->runtime_count == 1) {

			status = acpi_ev_enable_gpe(gpe_event_info);

			if (ACPI_FAILURE(status))

				gpe_event_info->runtime_count--;

		}

	}



	if (type & ACPI_GPE_TYPE_WAKE) {

		if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
@@ -335,6 +338,9 @@ acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 type) 


	ACPI_FUNCTION_TRACE(acpi_disable_gpe);



	if (type & ~ACPI_GPE_TYPE_WAKE_RUN)

		return_ACPI_STATUS(AE_BAD_PARAMETER);



	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Ensure that we have a valid GPE number */
@@ -344,12 +350,12 @@ acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 type) 
		goto unlock_and_exit;

	}



	if ((type & ACPI_GPE_TYPE_WAKE) && gpe_event_info->runtime_count) {

	if ((type & ACPI_GPE_TYPE_RUNTIME) && gpe_event_info->runtime_count) {

		if (--gpe_event_info->runtime_count == 0)

			acpi_ev_disable_gpe(gpe_event_info);

			status = acpi_ev_disable_gpe(gpe_event_info);

	}



	if ((type & ACPI_GPE_TYPE_RUNTIME) && gpe_event_info->wakeup_count) {

	if ((type & ACPI_GPE_TYPE_WAKE) && gpe_event_info->wakeup_count) {

		/*

		 * Wake-up GPEs are not enabled after leaving system sleep

		 * states, so we don't need to disable them here.

drivers/acpi/ec.c

+11 −3
Original line number Diff line number Diff line
@@ -307,6 +307,10 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) 
	pr_debug(PREFIX "transaction start\n");

	/* disable GPE during transaction if storm is detected */

	if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {

		/*

		 * It has to be disabled at the hardware level regardless of the

		 * GPE reference counting, so that it doesn't trigger.

		 */

		acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);

	}
@@ -316,7 +320,11 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) 
	ec_check_sci_sync(ec, acpi_ec_read_status(ec));

	if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {

		msleep(1);

		/* it is safe to enable GPE outside of transaction */

		/*

		 * It is safe to enable the GPE outside of the transaction.  Use

		 * acpi_set_gpe() for that, since we used it to disable the GPE

		 * above.

		 */

		acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE);

	} else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) {

		pr_info(PREFIX "GPE storm detected, "
@@ -1059,7 +1067,7 @@ error: 
static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)

{

	struct acpi_ec *ec = acpi_driver_data(device);

	/* Stop using GPE */

	/* Stop using the GPE, but keep it reference counted. */

	acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);

	return 0;

}
@@ -1067,7 +1075,7 @@ static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) 
static int acpi_ec_resume(struct acpi_device *device)

{

	struct acpi_ec *ec = acpi_driver_data(device);

	/* Enable use of GPE back */

	/* Enable the GPE again, but don't reference count it once more. */

	acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE);

	return 0;

}