On 06/06/2016 02:53 PM, Jon Hunter wrote:
> Some IRQ chips may be located in a power domain outside of the CPU
> subsystem and hence will require device specific runtime power
> management. In order to support such IRQ chips, add a pointer for a
> device structure to the irq_chip structure, and if this pointer is
> populated by the IRQ chip driver and CONFIG_PM is selected in the kernel
> configuration, then the pm_runtime_get/put APIs for this chip will be
> called when an IRQ is requested/freed, respectively.
>
> Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
> Reviewed-by: Kevin Hilman <khilman@xxxxxxxxxxxx>
> Reviewed-by: Marc Zyngier <marc.zyngier@xxxxxxx>
> ---
> include/linux/irq.h | 4 ++++
> kernel/irq/chip.c | 35 +++++++++++++++++++++++++++++++++++
> kernel/irq/internals.h | 1 +
> kernel/irq/manage.c | 31 ++++++++++++++++++++++++++++++-
> 4 files changed, 70 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/irq.h b/include/linux/irq.h
> index 4d758a7c604a..6c92a847394d 100644
> --- a/include/linux/irq.h
> +++ b/include/linux/irq.h
> @@ -315,6 +315,7 @@ static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
> /**
> * struct irq_chip - hardware interrupt chip descriptor
> *
> + * @parent_device: pointer to parent device for irqchip
> * @name: name for /proc/interrupts
> * @irq_startup: start up the interrupt (defaults to ->enable if NULL)
> * @irq_shutdown: shut down the interrupt (defaults to ->disable if NULL)
> @@ -354,6 +355,7 @@ static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
> * @flags: chip specific flags
> */
> struct irq_chip {
> + struct device *parent_device;
> const char *name;
> unsigned int (*irq_startup)(struct irq_data *data);
> void (*irq_shutdown)(struct irq_data *data);
> @@ -488,6 +490,8 @@ extern void handle_bad_irq(struct irq_desc *desc);
> extern void handle_nested_irq(unsigned int irq);
>
> extern int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg);
> +extern int irq_chip_pm_get(struct irq_data *data);
> +extern int irq_chip_pm_put(struct irq_data *data);
> #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
> extern void irq_chip_enable_parent(struct irq_data *data);
> extern void irq_chip_disable_parent(struct irq_data *data);
> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
> index 2f9f2b0e79f2..b09226e895c7 100644
> --- a/kernel/irq/chip.c
> +++ b/kernel/irq/chip.c
> @@ -1093,3 +1093,38 @@ int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
>
> return 0;
> }
> +
> +/**
> + * irq_chip_pm_get - Enable power for an IRQ chip
> + * @data: Pointer to interrupt specific data
> + *
> + * Enable the power to the IRQ chip referenced by the interrupt data
> + * structure.
> + */
> +int irq_chip_pm_get(struct irq_data *data)
> +{
> + int retval = 0;
> +
> + if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device)
> + retval = pm_runtime_get_sync(data->chip->parent_device);
Sry, for the late comment - above require pm_runtime_put_noidle(data->chip->parent_device);
in case of failure.
[...]
--
regards,
-grygorii
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