diff options
author | Mark Rutland <mark.rutland@arm.com> | 2017-10-09 17:09:05 +0100 |
---|---|---|
committer | Will Deacon <will.deacon@arm.com> | 2018-02-20 11:34:54 +0000 |
commit | 167e61438da0664cab87c825a6c0cb83510d578e (patch) | |
tree | 3b05ff3a90e1c171d6aaa98d9bfa3ef33168c8a2 | |
parent | 84b4be57ae17f8c0b3c1d8629e10f23910838fd7 (diff) | |
download | linux-stable-167e61438da0664cab87c825a6c0cb83510d578e.tar.gz linux-stable-167e61438da0664cab87c825a6c0cb83510d578e.tar.bz2 linux-stable-167e61438da0664cab87c825a6c0cb83510d578e.zip |
arm_pmu: acpi: request IRQs up-front
We can't request IRQs in atomic context, so for ACPI systems we'll have
to request them up-front, and later associate them with CPUs.
This patch reorganises the arm_pmu code to do so. As we no longer have
the arm_pmu structure at probe time, a number of prototypes need to be
adjusted, requiring changes to the common arm_pmu code and arm_pmu
platform code.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
-rw-r--r-- | drivers/perf/arm_pmu.c | 22 | ||||
-rw-r--r-- | drivers/perf/arm_pmu_acpi.c | 19 | ||||
-rw-r--r-- | drivers/perf/arm_pmu_platform.c | 15 | ||||
-rw-r--r-- | include/linux/perf/arm_pmu.h | 5 |
4 files changed, 23 insertions, 38 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index 2b2af35db1b6..0c2ed11c0603 100644 --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -534,7 +534,7 @@ static int armpmu_count_irq_users(const int irq) return count; } -void armpmu_free_cpu_irq(int irq, int cpu) +void armpmu_free_irq(int irq, int cpu) { if (per_cpu(cpu_irq, cpu) == 0) return; @@ -549,15 +549,7 @@ void armpmu_free_cpu_irq(int irq, int cpu) per_cpu(cpu_irq, cpu) = 0; } -void armpmu_free_irq(struct arm_pmu *armpmu, int cpu) -{ - struct pmu_hw_events __percpu *hw_events = armpmu->hw_events; - int irq = per_cpu(hw_events->irq, cpu); - - armpmu_free_cpu_irq(irq, cpu); -} - -int armpmu_request_cpu_irq(int irq, int cpu) +int armpmu_request_irq(int irq, int cpu) { int err = 0; const irq_handler_t handler = armpmu_dispatch_irq; @@ -598,16 +590,6 @@ err_out: return err; } -int armpmu_request_irq(struct arm_pmu *armpmu, int cpu) -{ - struct pmu_hw_events __percpu *hw_events = armpmu->hw_events; - int irq = per_cpu(hw_events->irq, cpu); - if (!irq) - return 0; - - return armpmu_request_cpu_irq(irq, cpu); -} - static int armpmu_get_cpu_irq(struct arm_pmu *pmu, int cpu) { struct pmu_hw_events __percpu *hw_events = pmu->hw_events; diff --git a/drivers/perf/arm_pmu_acpi.c b/drivers/perf/arm_pmu_acpi.c index 09a1a36cff57..0f197516d708 100644 --- a/drivers/perf/arm_pmu_acpi.c +++ b/drivers/perf/arm_pmu_acpi.c @@ -89,7 +89,13 @@ static int arm_pmu_acpi_parse_irqs(void) pr_warn("No ACPI PMU IRQ for CPU%d\n", cpu); } + /* + * Log and request the IRQ so the core arm_pmu code can manage + * it. We'll have to sanity-check IRQs later when we associate + * them with their PMUs. + */ per_cpu(pmu_irqs, cpu) = irq; + armpmu_request_irq(irq, cpu); } return 0; @@ -205,14 +211,6 @@ static int arm_pmu_acpi_cpu_starting(unsigned int cpu) cpumask_set_cpu(cpu, &pmu->supported_cpus); /* - * Log and request the IRQ so the core arm_pmu code can manage it. In - * some situations (e.g. mismatched PPIs), we may fail to request the - * IRQ. However, it may be too late for us to do anything about it. - * The common ARM PMU code will log a warning in this case. - */ - armpmu_request_irq(pmu, cpu); - - /* * Ideally, we'd probe the PMU here when we find the first matching * CPU. We can't do that for several reasons; see the comment in * arm_pmu_acpi_init(). @@ -281,11 +279,6 @@ static int arm_pmu_acpi_init(void) if (acpi_disabled) return 0; - /* - * We can't request IRQs yet, since we don't know the cookie value - * until we know which CPUs share the same logical PMU. We'll handle - * that in arm_pmu_acpi_cpu_starting(). - */ ret = arm_pmu_acpi_parse_irqs(); if (ret) return ret; diff --git a/drivers/perf/arm_pmu_platform.c b/drivers/perf/arm_pmu_platform.c index 1dc3c1f574e0..7729eda5909d 100644 --- a/drivers/perf/arm_pmu_platform.c +++ b/drivers/perf/arm_pmu_platform.c @@ -159,10 +159,15 @@ static int pmu_parse_irqs(struct arm_pmu *pmu) static int armpmu_request_irqs(struct arm_pmu *armpmu) { + struct pmu_hw_events __percpu *hw_events = armpmu->hw_events; int cpu, err; for_each_cpu(cpu, &armpmu->supported_cpus) { - err = armpmu_request_irq(armpmu, cpu); + int irq = per_cpu(hw_events->irq, cpu); + if (!irq) + continue; + + err = armpmu_request_irq(irq, cpu); if (err) break; } @@ -173,9 +178,13 @@ static int armpmu_request_irqs(struct arm_pmu *armpmu) static void armpmu_free_irqs(struct arm_pmu *armpmu) { int cpu; + struct pmu_hw_events __percpu *hw_events = armpmu->hw_events; - for_each_cpu(cpu, &armpmu->supported_cpus) - armpmu_free_irq(armpmu, cpu); + for_each_cpu(cpu, &armpmu->supported_cpus) { + int irq = per_cpu(hw_events->irq, cpu); + + armpmu_free_irq(irq, cpu); + } } int arm_pmu_device_probe(struct platform_device *pdev, diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h index feec9e7e85db..40036a57d072 100644 --- a/include/linux/perf/arm_pmu.h +++ b/include/linux/perf/arm_pmu.h @@ -14,6 +14,7 @@ #include <linux/interrupt.h> #include <linux/perf_event.h> +#include <linux/platform_device.h> #include <linux/sysfs.h> #include <asm/cputype.h> @@ -159,8 +160,8 @@ struct arm_pmu *armpmu_alloc(void); struct arm_pmu *armpmu_alloc_atomic(void); void armpmu_free(struct arm_pmu *pmu); int armpmu_register(struct arm_pmu *pmu); -int armpmu_request_irq(struct arm_pmu *armpmu, int cpu); -void armpmu_free_irq(struct arm_pmu *armpmu, int cpu); +int armpmu_request_irq(int irq, int cpu); +void armpmu_free_irq(int irq, int cpu); #define ARMV8_PMU_PDEV_NAME "armv8-pmu" |