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ARM: 6064/1: pmu: register IRQs at runtime

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The current PMU infrastructure for ARM requires that the IRQs for the PMU
device are fixed at compile time and are selected based on the ARCH_ or MACH_ flags. This has the disadvantage of tying the Kernel down to a
particular board as far as profiling is concerned.

This patch replaces the compile-time IRQ registration with a runtime mechanism which allows the IRQs to be registered with the framework as
a platform_device.

A further advantage of this change is that there is scope for registering
different types of performance counters in the future by changing the id
of the platform_device and attaching different resources to it.

Acked-by: Jamie Iles <jamie.iles@picochip.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon
2010-04-29 17:13:24 +01:00
committed by Russell King
parent c39e52a793
commit 49c006b937
3 changed files with 128 additions and 82 deletions
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27
arch/arm/include/asm/pmu.h
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@@ -19,31 +19,26 @@ enum arm_pmu_type {
#ifdef CONFIG_CPU_HAS_PMU
struct pmu_irqs {
const int *irqs;
int num_irqs;
};
/**
* reserve_pmu() - reserve the hardware performance counters
*
* Reserve the hardware performance counters in the system for exclusive use.
* The 'struct pmu_irqs' for the system is returned on success, ERR_PTR()
* The platform_device for the system is returned on success, ERR_PTR()
* encoded error on failure.
*/
extern const struct pmu_irqs *
reserve_pmu(void);
extern struct platform_device *
reserve_pmu(enum arm_pmu_type device);
/**
* release_pmu() - Relinquish control of the performance counters
*
* Release the performance counters and allow someone else to use them.
* Callers must have disabled the counters and released IRQs before calling
* this. The 'struct pmu_irqs' returned from reserve_pmu() must be passed as
* this. The platform_device returned from reserve_pmu() must be passed as
* a cookie.
*/
extern int
release_pmu(const struct pmu_irqs *irqs);
release_pmu(struct platform_device *pdev);
/**
* init_pmu() - Initialise the PMU.
@@ -53,24 +48,26 @@ release_pmu(const struct pmu_irqs *irqs);
* the actual hardware initialisation.
*/
extern int
init_pmu(void);
init_pmu(enum arm_pmu_type device);
#else /* CONFIG_CPU_HAS_PMU */
static inline const struct pmu_irqs *
reserve_pmu(void)
#include <linux/err.h>
static inline struct platform_device *
reserve_pmu(enum arm_pmu_type device)
{
return ERR_PTR(-ENODEV);
}
static inline int
release_pmu(const struct pmu_irqs *irqs)
release_pmu(struct platform_device *pdev)
{
return -ENODEV;
}
static inline int
init_pmu(void)
init_pmu(enum arm_pmu_type device)
{
return -ENODEV;
}