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Date: Tue, 15 Sep 2009 23:30:38 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Matthew Garrett <mjg@...hat.com>
Cc: robert.moore@...el.com, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] ACPI: Add infrastructure for refcounting GPE consumers
On Wednesday 02 September 2009, Matthew Garrett wrote:
> ACPI GPEs may map to multiple devices. The current GPE interface only
> provides a mechanism for enabling and disabling GPEs, making it difficult
> to change the state of GPEs at runtime without extensive cooperation
> between devices. Add an API to allow devices to indicate whether or not
> they want their device's GPE to be enabled for both runtime and wakeup
> events.
Looks fine in general, but are we going to do anything about unbalanced
puts?
Rafael
> Signed-off-by: Matthew Garrett <mjg@...hat.com>
> ---
> drivers/acpi/acpica/aclocal.h | 2 +
> drivers/acpi/acpica/evxfevnt.c | 161 ++++++++++++++++++++++++++++++++++++++++
> include/acpi/acpixf.h | 8 ++
> 3 files changed, 171 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h
> index ee986ed..935e351 100644
> --- a/drivers/acpi/acpica/aclocal.h
> +++ b/drivers/acpi/acpica/aclocal.h
> @@ -413,6 +413,8 @@ struct acpi_gpe_event_info {
> struct acpi_gpe_register_info *register_info; /* Backpointer to register info */
> u8 flags; /* Misc info about this GPE */
> u8 gpe_number; /* This GPE */
> + u8 runtime_count;
> + u8 wakeup_count;
> };
>
> /* Information about a GPE register pair, one per each status/enable pair in an array */
> diff --git a/drivers/acpi/acpica/evxfevnt.c b/drivers/acpi/acpica/evxfevnt.c
> index 4721f58..2a98818 100644
> --- a/drivers/acpi/acpica/evxfevnt.c
> +++ b/drivers/acpi/acpica/evxfevnt.c
> @@ -201,6 +201,167 @@ ACPI_EXPORT_SYMBOL(acpi_enable_event)
>
> /*******************************************************************************
> *
> + * FUNCTION: acpi_get_runtime_gpe
> + *
> + * PARAMETERS: gpe_device - Parent GPE Device
> + * gpe_number - GPE level within the GPE block
> + *
> + * RETURN: Status
> + *
> + * DESCRIPTION: Take a reference to a runtime GPE
> + *
> + ******************************************************************************/
> +acpi_status acpi_get_runtime_gpe(acpi_handle gpe_device, u32 gpe_number)
> +{
> + acpi_status status = AE_OK;
> + acpi_cpu_flags flags;
> + struct acpi_gpe_event_info *gpe_event_info;
> +
> + ACPI_FUNCTION_TRACE(acpi_get_runtime_gpe);
> +
> + flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
> +
> + /* 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) {
> + status = AE_BAD_PARAMETER;
> + goto unlock_and_exit;
> + }
> +
> + if (++gpe_event_info->runtime_count == 1)
> + status = acpi_ev_enable_gpe(gpe_event_info, TRUE);
> +
> + if (ACPI_FAILURE(status))
> + gpe_event_info->runtime_count--;
> +
> +unlock_and_exit:
> + acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
> + return_ACPI_STATUS(status);
> +}
> +ACPI_EXPORT_SYMBOL(acpi_get_runtime_gpe)
> +
> +/*******************************************************************************
> + *
> + * FUNCTION: acpi_put_runtime_gpe
> + *
> + * PARAMETERS: gpe_device - Parent GPE Device
> + * gpe_number - GPE level within the GPE block
> + *
> + * RETURN: Status
> + *
> + * DESCRIPTION: Release a reference to a runtime GPE
> + *
> + ******************************************************************************/
> +acpi_status acpi_put_runtime_gpe(acpi_handle gpe_device, u32 gpe_number)
> +{
> + acpi_status status = AE_OK;
> + acpi_cpu_flags flags;
> + struct acpi_gpe_event_info *gpe_event_info;
> +
> + ACPI_FUNCTION_TRACE(acpi_put_runtime_gpe);
> +
> + flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
> +
> + /* 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) {
> + status = AE_BAD_PARAMETER;
> + goto unlock_and_exit;
> + }
> +
> + if (--gpe_event_info->runtime_count == 0)
> + acpi_ev_disable_gpe(gpe_event_info);
> +
> +unlock_and_exit:
> + acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
> + return_ACPI_STATUS(status);
> +}
> +ACPI_EXPORT_SYMBOL(acpi_put_runtime_gpe)
> +
> +/*******************************************************************************
> + *
> + * FUNCTION: acpi_get_wakeup_gpe
> + *
> + * PARAMETERS: gpe_device - Parent GPE Device
> + * gpe_number - GPE level within the GPE block
> + *
> + * RETURN: Status
> + *
> + * DESCRIPTION: Take a reference to a wakeup GPE
> + *
> + ******************************************************************************/
> +acpi_status acpi_get_wakeup_gpe(acpi_handle gpe_device, u32 gpe_number)
> +{
> + acpi_status status = AE_OK;
> + acpi_cpu_flags flags;
> + struct acpi_gpe_event_info *gpe_event_info;
> +
> + ACPI_FUNCTION_TRACE(acpi_get_wakeup_gpe);
> +
> + flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
> +
> + /* 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) {
> + status = AE_BAD_PARAMETER;
> + goto unlock_and_exit;
> + }
> +
> + if (++gpe_event_info->wakeup_count == 1)
> + acpi_ev_update_gpe_enable_masks(gpe_event_info,
> + ACPI_GPE_ENABLE);
> +
> +unlock_and_exit:
> + acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
> + return_ACPI_STATUS(status);
> +}
> +ACPI_EXPORT_SYMBOL(acpi_get_wakeup_gpe)
> +
> +/*******************************************************************************
> + *
> + * FUNCTION: acpi_put_wakeup_gpe
> + *
> + * PARAMETERS: gpe_device - Parent GPE Device
> + * gpe_number - GPE level within the GPE block
> + *
> + * RETURN: Status
> + *
> + * DESCRIPTION: Release a reference to a wakeup GPE
> + *
> + ******************************************************************************/
> +acpi_status acpi_put_wakeup_gpe(acpi_handle gpe_device, u32 gpe_number)
> +{
> + acpi_status status = AE_OK;
> + acpi_cpu_flags flags;
> + struct acpi_gpe_event_info *gpe_event_info;
> +
> + ACPI_FUNCTION_TRACE(acpi_put_wakeup_gpe);
> +
> + flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
> +
> + /* 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) {
> + status = AE_BAD_PARAMETER;
> + goto unlock_and_exit;
> + }
> +
> + if (--gpe_event_info->wakeup_count == 0)
> + acpi_ev_update_gpe_enable_masks(gpe_event_info,
> + ACPI_GPE_DISABLE);
> +
> +unlock_and_exit:
> + acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
> + return_ACPI_STATUS(status);
> +}
> +ACPI_EXPORT_SYMBOL(acpi_put_wakeup_gpe)
> +
> +/*******************************************************************************
> + *
> * FUNCTION: acpi_set_gpe_type
> *
> * PARAMETERS: gpe_device - Parent GPE Device
> diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
> index 82ec6a3..671e699 100644
> --- a/include/acpi/acpixf.h
> +++ b/include/acpi/acpixf.h
> @@ -280,6 +280,14 @@ acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status);
> */
> acpi_status acpi_set_gpe_type(acpi_handle gpe_device, u32 gpe_number, u8 type);
>
> +acpi_status acpi_get_runtime_gpe(acpi_handle gpe_device, u32 gpe_number);
> +
> +acpi_status acpi_put_runtime_gpe(acpi_handle gpe_device, u32 gpe_number);
> +
> +acpi_status acpi_get_wakeup_gpe(acpi_handle gpe_device, u32 gpe_number);
> +
> +acpi_status acpi_put_wakeup_gpe(acpi_handle gpe_device, u32 gpe_number);
> +
> acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number);
>
> acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number);
>
--
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