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[PATCH V5 7/9] irqchip/gic: Prepare for adding platform driver

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  [PATCH V5 7/9] irqchip/gic: Prepare for adding platform driver Jon Hunter <jonathanh@nvidia.com> - 2016-06-06 14:00 +0200
    Re: [PATCH V5 7/9] irqchip/gic: Prepare for adding platform driver Jon Hunter <jonathanh@nvidia.com> - 2016-06-06 14:50 +0200

#1414945 — [PATCH V5 7/9] irqchip/gic: Prepare for adding platform driver

To support GICs that require runtime power management, it is necessary
to add a platform driver, so that the probing of the chip can be
deferred if resources, such as a power-domain, is not yet available.

To prepare for adding a platform driver:
 1. Drop the __init section from the gic_dist_config() so this can be
    re-used by the platform driver.
 2. Add prototypes for functions required by the platform driver to the
    GIC header file so they can be re-used.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
---
 drivers/irqchip/irq-gic-common.c |  4 ++--
 drivers/irqchip/irq-gic.c        | 15 ++++++++-------
 include/linux/irqchip/arm-gic.h  |  5 +++++
 3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/drivers/irqchip/irq-gic-common.c b/drivers/irqchip/irq-gic-common.c
index 89e7423f0ebb..9ae71804b5dd 100644
--- a/drivers/irqchip/irq-gic-common.c
+++ b/drivers/irqchip/irq-gic-common.c
@@ -90,8 +90,8 @@ int gic_configure_irq(unsigned int irq, unsigned int type,
 	return ret;
 }
 
-void __init gic_dist_config(void __iomem *base, int gic_irqs,
-			    void (*sync_access)(void))
+void gic_dist_config(void __iomem *base, int gic_irqs,
+		     void (*sync_access)(void))
 {
 	unsigned int i;
 
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 94eab6e23124..3d3ab9045244 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -449,7 +449,7 @@ static void gic_cpu_if_up(struct gic_chip_data *gic)
 }
 
 
-static void __init gic_dist_init(struct gic_chip_data *gic)
+static void gic_dist_init(struct gic_chip_data *gic)
 {
 	unsigned int i;
 	u32 cpumask;
@@ -535,7 +535,7 @@ int gic_cpu_if_down(unsigned int gic_nr)
  * this function, no interrupts will be delivered by the GIC, and another
  * platform-specific wakeup source must be enabled.
  */
-static void gic_dist_save(struct gic_chip_data *gic)
+void gic_dist_save(struct gic_chip_data *gic)
 {
 	unsigned int gic_irqs;
 	void __iomem *dist_base;
@@ -574,7 +574,7 @@ static void gic_dist_save(struct gic_chip_data *gic)
  * handled normally, but any edge interrupts that occured will not be seen by
  * the GIC and need to be handled by the platform-specific wakeup source.
  */
-static void gic_dist_restore(struct gic_chip_data *gic)
+void gic_dist_restore(struct gic_chip_data *gic)
 {
 	unsigned int gic_irqs;
 	unsigned int i;
@@ -620,7 +620,7 @@ static void gic_dist_restore(struct gic_chip_data *gic)
 	writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL);
 }
 
-static void gic_cpu_save(struct gic_chip_data *gic)
+void gic_cpu_save(struct gic_chip_data *gic)
 {
 	int i;
 	u32 *ptr;
@@ -650,7 +650,7 @@ static void gic_cpu_save(struct gic_chip_data *gic)
 
 }
 
-static void gic_cpu_restore(struct gic_chip_data *gic)
+void gic_cpu_restore(struct gic_chip_data *gic)
 {
 	int i;
 	u32 *ptr;
@@ -727,7 +727,7 @@ static struct notifier_block gic_notifier_block = {
 	.notifier_call = gic_notifier,
 };
 
-static int __init gic_pm_init(struct gic_chip_data *gic)
+static int gic_pm_init(struct gic_chip_data *gic)
 {
 	gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
 		sizeof(u32));
@@ -757,7 +757,7 @@ free_ppi_enable:
 	return -ENOMEM;
 }
 #else
-static int __init gic_pm_init(struct gic_chip_data *gic)
+static int gic_pm_init(struct gic_chip_data *gic)
 {
 	return 0;
 }
@@ -1179,6 +1179,7 @@ static int __init __gic_init_bases(struct gic_chip_data *gic,
 		set_smp_cross_call(gic_raise_softirq);
 		register_cpu_notifier(&gic_cpu_notifier);
 #endif
+
 		set_handle_irq(gic_handle_irq);
 		if (static_key_true(&supports_deactivate))
 			pr_info("GIC: Using split EOI/Deactivate mode\n");
diff --git a/include/linux/irqchip/arm-gic.h b/include/linux/irqchip/arm-gic.h
index fd051855539b..ffcbd8b9a4ff 100644
--- a/include/linux/irqchip/arm-gic.h
+++ b/include/linux/irqchip/arm-gic.h
@@ -101,9 +101,14 @@
 #include <linux/irqdomain.h>
 
 struct device_node;
+struct gic_chip_data;
 
 void gic_cascade_irq(unsigned int gic_nr, unsigned int irq);
 int gic_cpu_if_down(unsigned int gic_nr);
+void gic_cpu_save(struct gic_chip_data *gic);
+void gic_cpu_restore(struct gic_chip_data *gic);
+void gic_dist_save(struct gic_chip_data *gic);
+void gic_dist_restore(struct gic_chip_data *gic);
 
 /*
  * Subdrivers that need some preparatory work can initialize their
-- 
2.1.4

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#1415003

On 06/06/16 12:53, Jon Hunter wrote:
> To support GICs that require runtime power management, it is necessary
> to add a platform driver, so that the probing of the chip can be
> deferred if resources, such as a power-domain, is not yet available.
> 
> To prepare for adding a platform driver:
>  1. Drop the __init section from the gic_dist_config() so this can be
>     re-used by the platform driver.
>  2. Add prototypes for functions required by the platform driver to the
>     GIC header file so they can be re-used.
> 
> Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
> ---
>  drivers/irqchip/irq-gic-common.c |  4 ++--
>  drivers/irqchip/irq-gic.c        | 15 ++++++++-------
>  include/linux/irqchip/arm-gic.h  |  5 +++++
>  3 files changed, 15 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-gic-common.c b/drivers/irqchip/irq-gic-common.c
> index 89e7423f0ebb..9ae71804b5dd 100644
> --- a/drivers/irqchip/irq-gic-common.c
> +++ b/drivers/irqchip/irq-gic-common.c
> @@ -90,8 +90,8 @@ int gic_configure_irq(unsigned int irq, unsigned int type,
>  	return ret;
>  }
>  
> -void __init gic_dist_config(void __iomem *base, int gic_irqs,
> -			    void (*sync_access)(void))
> +void gic_dist_config(void __iomem *base, int gic_irqs,
> +		     void (*sync_access)(void))
>  {
>  	unsigned int i;
>  
> diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
> index 94eab6e23124..3d3ab9045244 100644
> --- a/drivers/irqchip/irq-gic.c
> +++ b/drivers/irqchip/irq-gic.c
> @@ -449,7 +449,7 @@ static void gic_cpu_if_up(struct gic_chip_data *gic)
>  }
>  
>  
> -static void __init gic_dist_init(struct gic_chip_data *gic)
> +static void gic_dist_init(struct gic_chip_data *gic)
>  {
>  	unsigned int i;
>  	u32 cpumask;
> @@ -535,7 +535,7 @@ int gic_cpu_if_down(unsigned int gic_nr)
>   * this function, no interrupts will be delivered by the GIC, and another
>   * platform-specific wakeup source must be enabled.
>   */
> -static void gic_dist_save(struct gic_chip_data *gic)
> +void gic_dist_save(struct gic_chip_data *gic)
>  {
>  	unsigned int gic_irqs;
>  	void __iomem *dist_base;
> @@ -574,7 +574,7 @@ static void gic_dist_save(struct gic_chip_data *gic)
>   * handled normally, but any edge interrupts that occured will not be seen by
>   * the GIC and need to be handled by the platform-specific wakeup source.
>   */
> -static void gic_dist_restore(struct gic_chip_data *gic)
> +void gic_dist_restore(struct gic_chip_data *gic)
>  {
>  	unsigned int gic_irqs;
>  	unsigned int i;
> @@ -620,7 +620,7 @@ static void gic_dist_restore(struct gic_chip_data *gic)
>  	writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL);
>  }
>  
> -static void gic_cpu_save(struct gic_chip_data *gic)
> +void gic_cpu_save(struct gic_chip_data *gic)
>  {
>  	int i;
>  	u32 *ptr;
> @@ -650,7 +650,7 @@ static void gic_cpu_save(struct gic_chip_data *gic)
>  
>  }
>  
> -static void gic_cpu_restore(struct gic_chip_data *gic)
> +void gic_cpu_restore(struct gic_chip_data *gic)
>  {
>  	int i;
>  	u32 *ptr;
> @@ -727,7 +727,7 @@ static struct notifier_block gic_notifier_block = {
>  	.notifier_call = gic_notifier,
>  };
>  
> -static int __init gic_pm_init(struct gic_chip_data *gic)
> +static int gic_pm_init(struct gic_chip_data *gic)
>  {
>  	gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
>  		sizeof(u32));
> @@ -757,7 +757,7 @@ free_ppi_enable:
>  	return -ENOMEM;
>  }
>  #else
> -static int __init gic_pm_init(struct gic_chip_data *gic)
> +static int gic_pm_init(struct gic_chip_data *gic)
>  {
>  	return 0;
>  }
> @@ -1179,6 +1179,7 @@ static int __init __gic_init_bases(struct gic_chip_data *gic,
>  		set_smp_cross_call(gic_raise_softirq);
>  		register_cpu_notifier(&gic_cpu_notifier);
>  #endif
> +

Not sure where this extra line came from but shouldn't be here.

Marc let me know if you want me to resend.

Jon

-- 
nvpublic

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