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genirq: Allow the PM device to originate from irq domain 

As a preparation to moving the reference to the device used for
runtime power management, add a new 'dev' field to the irqdomain
structure for that exact purpose.

The irq_chip_pm_{get,put}() helpers are made aware of the dual
location via a new private helper.

No functional change intended.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Tony Lindgren <tony@atomide.com>
Acked-by: Bartosz Golaszewski <brgl@bgdev.pl>
Link: https://lore.kernel.org/r/20220201120310.878267-2-maz@kernel.org
This commit is contained in:
Marc Zyngier 2022-02-01 12:02:59 +00:00
parent dfd42facf1
commit 1f8863bfb5
2 changed files with 28 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/linux/irqdomain.h
View File

@ -151,6 +151,8 @@ struct irq_domain_chip_generic;
* @gc: Pointer to a list of generic chips. There is a helper function for
* setting up one or more generic chips for interrupt controllers
* drivers using the generic chip library which uses this pointer.
* @dev: Pointer to a device that the domain represent, and that will be
* used for power management purposes.
* @parent: Pointer to parent irq_domain to support hierarchy irq_domains
*
* Revmap data, used internally by irq_domain
@ -171,6 +173,7 @@ struct irq_domain {
struct fwnode_handle *fwnode;
enum irq_domain_bus_token bus_token;
struct irq_domain_chip_generic *gc;
struct device *dev;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
struct irq_domain *parent;
#endif
@ -226,6 +229,13 @@ static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d)
return to_of_node(d->fwnode);
}
static inline void irq_domain_set_pm_device(struct irq_domain *d,
struct device *dev)
{
if (d)
d->dev = dev;
}
#ifdef CONFIG_IRQ_DOMAIN
struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
const char *name, phys_addr_t *pa);

23
kernel/irq/chip.c
View File

@ -1558,6 +1558,17 @@ int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
return 0;
}
static struct device *irq_get_parent_device(struct irq_data *data)
{
if (data->chip->parent_device)
return data->chip->parent_device;
if (data->domain)
return data->domain->dev;
return NULL;
}
/**
* irq_chip_pm_get - Enable power for an IRQ chip
* @data: Pointer to interrupt specific data
@ -1567,12 +1578,13 @@ int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
*/
int irq_chip_pm_get(struct irq_data *data)
{
struct device *dev = irq_get_parent_device(data);
int retval;
if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device) {
retval = pm_runtime_get_sync(data->chip->parent_device);
if (IS_ENABLED(CONFIG_PM) && dev) {
retval = pm_runtime_get_sync(dev);
if (retval < 0) {
pm_runtime_put_noidle(data->chip->parent_device);
pm_runtime_put_noidle(dev);
return retval;
}
}
@ -1590,10 +1602,11 @@ int irq_chip_pm_get(struct irq_data *data)
*/
int irq_chip_pm_put(struct irq_data *data)
{
struct device *dev = irq_get_parent_device(data);
int retval = 0;
if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device)
retval = pm_runtime_put(data->chip->parent_device);
if (IS_ENABLED(CONFIG_PM) && dev)
retval = pm_runtime_put(dev);
return (retval < 0) ? retval : 0;
}