5.15-stable review patch. If anyone has any objections, please let me know.
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From: Marc Zyngier maz@kernel.org
[ Upstream commit 1f8863bfb5ca500ea1c7669b16b1931ba27fce20 ]
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 Stable-dep-of: 33b1c47d1fc0 ("irqchip/imx-irqsteer: Handle runtime power management correctly") Signed-off-by: Sasha Levin sashal@kernel.org --- include/linux/irqdomain.h | 10 ++++++++++ kernel/irq/chip.c | 23 ++++++++++++++++++----- 2 files changed, 28 insertions(+), 5 deletions(-)
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h index 9ee238ad29ce9..a7c80bd4b45b6 100644 --- a/include/linux/irqdomain.h +++ b/include/linux/irqdomain.h @@ -147,6 +147,8 @@ 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 @@ -167,6 +169,7 @@ 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 @@ -222,6 +225,13 @@ 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); diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index f3920374f71ce..7ea66e55ef86b 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -1559,6 +1559,17 @@ 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 @@ -1568,12 +1579,13 @@ 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; } } @@ -1591,10 +1603,11 @@ 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; }