On 06/06/16 15:13, Grygorii Strashko wrote:
> 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.
No problem. Sorry, can you elaborate? I am not familiar with the
_put_noidle().
Cheers
Jon
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nvpublic
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