diff options
| author | Jamie Iles <jamie.iles@picochip.com> | 2010-02-02 20:24:07 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-02-12 17:23:43 +0000 |
| commit | 1618fdd9602c689de2f820a88cb3e283a39c3d90 (patch) | |
| tree | be2cec6548d61dc83b7fc538fa929533f9cb9112 /arch/arm/oprofile/op_model_xscale.c | |
| parent | 0f4f0672ac950c96cffaf84a666d35e817d7c3ca (diff) | |
ARM: 5901/2: arm/oprofile: reserve the PMU when starting
Make sure that we have access to the performance counters and
that they aren't being used by perf events or anything else.
Cc: Will Deacon <will.deacon@arm.com>
Cc: Jean Pihet <jpihet@mvista.com>
Signed-off-by: Jamie Iles <jamie.iles@picochip.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/oprofile/op_model_xscale.c')
| -rw-r--r-- | arch/arm/oprofile/op_model_xscale.c | 35 |
1 files changed, 19 insertions, 16 deletions
diff --git a/arch/arm/oprofile/op_model_xscale.c b/arch/arm/oprofile/op_model_xscale.c index 724ab9ce252..1d34a02048b 100644 --- a/arch/arm/oprofile/op_model_xscale.c +++ b/arch/arm/oprofile/op_model_xscale.c @@ -17,12 +17,14 @@ /* #define DEBUG */ #include <linux/types.h> #include <linux/errno.h> +#include <linux/err.h> #include <linux/sched.h> #include <linux/oprofile.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <asm/cputype.h> +#include <asm/pmu.h> #include "op_counter.h" #include "op_arm_model.h" @@ -33,17 +35,6 @@ #define PMU_RESET (CCNT_RESET | PMN_RESET) #define PMU_CNT64 0x008 /* Make CCNT count every 64th cycle */ -/* TODO do runtime detection */ -#ifdef CONFIG_ARCH_IOP32X -#define XSCALE_PMU_IRQ IRQ_IOP32X_CORE_PMU -#endif -#ifdef CONFIG_ARCH_IOP33X -#define XSCALE_PMU_IRQ IRQ_IOP33X_CORE_PMU -#endif -#ifdef CONFIG_ARCH_PXA -#define XSCALE_PMU_IRQ IRQ_PMU -#endif - /* * Different types of events that can be counted by the XScale PMU * as used by Oprofile userspace. Here primarily for documentation @@ -367,6 +358,8 @@ static irqreturn_t xscale_pmu_interrupt(int irq, void *arg) return IRQ_HANDLED; } +static const struct pmu_irqs *pmu_irqs; + static void xscale_pmu_stop(void) { u32 pmnc = read_pmnc(); @@ -374,20 +367,30 @@ static void xscale_pmu_stop(void) pmnc &= ~PMU_ENABLE; write_pmnc(pmnc); - free_irq(XSCALE_PMU_IRQ, results); + free_irq(pmu_irqs->irqs[0], results); + release_pmu(pmu_irqs); + pmu_irqs = NULL; } static int xscale_pmu_start(void) { int ret; - u32 pmnc = read_pmnc(); + u32 pmnc; + + pmu_irqs = reserve_pmu(); + if (IS_ERR(pmu_irqs)) + return PTR_ERR(pmu_irqs); + + pmnc = read_pmnc(); - ret = request_irq(XSCALE_PMU_IRQ, xscale_pmu_interrupt, IRQF_DISABLED, - "XScale PMU", (void *)results); + ret = request_irq(pmu_irqs->irqs[0], xscale_pmu_interrupt, + IRQF_DISABLED, "XScale PMU", (void *)results); if (ret < 0) { printk(KERN_ERR "oprofile: unable to request IRQ%d for XScale PMU\n", - XSCALE_PMU_IRQ); + pmu_irqs->irqs[0]); + release_pmu(pmu_irqs); + pmu_irqs = NULL; return ret; } |