[PATCH v3 2/7] arm_pmu: Change API to support 64bit counter values
From: Suzuki K Poulose
Date: Tue Jun 19 2018 - 06:17:27 EST
Convert the {read/write}_counter APIs to handle 64bit values
to enable supporting chained event counters.
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Reviewed-by: Julien Thierry <julien.thierry@xxxxxxx>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
---
- No changes since v2
---
arch/arm/kernel/perf_event_v6.c | 4 ++--
arch/arm/kernel/perf_event_v7.c | 4 ++--
arch/arm/kernel/perf_event_xscale.c | 8 ++++----
arch/arm64/kernel/perf_event.c | 9 ++++-----
include/linux/perf/arm_pmu.h | 4 ++--
5 files changed, 14 insertions(+), 15 deletions(-)
diff --git a/arch/arm/kernel/perf_event_v6.c b/arch/arm/kernel/perf_event_v6.c
index f64a6bf..0729f98 100644
--- a/arch/arm/kernel/perf_event_v6.c
+++ b/arch/arm/kernel/perf_event_v6.c
@@ -233,7 +233,7 @@ armv6_pmcr_counter_has_overflowed(unsigned long pmcr,
return ret;
}
-static inline u32 armv6pmu_read_counter(struct perf_event *event)
+static inline u64 armv6pmu_read_counter(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
int counter = hwc->idx;
@@ -251,7 +251,7 @@ static inline u32 armv6pmu_read_counter(struct perf_event *event)
return value;
}
-static inline void armv6pmu_write_counter(struct perf_event *event, u32 value)
+static inline void armv6pmu_write_counter(struct perf_event *event, u64 value)
{
struct hw_perf_event *hwc = &event->hw;
int counter = hwc->idx;
diff --git a/arch/arm/kernel/perf_event_v7.c b/arch/arm/kernel/perf_event_v7.c
index ecca4cd..fd7ce01 100644
--- a/arch/arm/kernel/perf_event_v7.c
+++ b/arch/arm/kernel/perf_event_v7.c
@@ -743,7 +743,7 @@ static inline void armv7_pmnc_select_counter(int idx)
isb();
}
-static inline u32 armv7pmu_read_counter(struct perf_event *event)
+static inline u64 armv7pmu_read_counter(struct perf_event *event)
{
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
struct hw_perf_event *hwc = &event->hw;
@@ -763,7 +763,7 @@ static inline u32 armv7pmu_read_counter(struct perf_event *event)
return value;
}
-static inline void armv7pmu_write_counter(struct perf_event *event, u32 value)
+static inline void armv7pmu_write_counter(struct perf_event *event, u64 value)
{
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
struct hw_perf_event *hwc = &event->hw;
diff --git a/arch/arm/kernel/perf_event_xscale.c b/arch/arm/kernel/perf_event_xscale.c
index c4f0294..942230f 100644
--- a/arch/arm/kernel/perf_event_xscale.c
+++ b/arch/arm/kernel/perf_event_xscale.c
@@ -316,7 +316,7 @@ static void xscale1pmu_stop(struct arm_pmu *cpu_pmu)
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
}
-static inline u32 xscale1pmu_read_counter(struct perf_event *event)
+static inline u64 xscale1pmu_read_counter(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
int counter = hwc->idx;
@@ -337,7 +337,7 @@ static inline u32 xscale1pmu_read_counter(struct perf_event *event)
return val;
}
-static inline void xscale1pmu_write_counter(struct perf_event *event, u32 val)
+static inline void xscale1pmu_write_counter(struct perf_event *event, u64 val)
{
struct hw_perf_event *hwc = &event->hw;
int counter = hwc->idx;
@@ -678,7 +678,7 @@ static void xscale2pmu_stop(struct arm_pmu *cpu_pmu)
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
}
-static inline u32 xscale2pmu_read_counter(struct perf_event *event)
+static inline u64 xscale2pmu_read_counter(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
int counter = hwc->idx;
@@ -705,7 +705,7 @@ static inline u32 xscale2pmu_read_counter(struct perf_event *event)
return val;
}
-static inline void xscale2pmu_write_counter(struct perf_event *event, u32 val)
+static inline void xscale2pmu_write_counter(struct perf_event *event, u64 val)
{
struct hw_perf_event *hwc = &event->hw;
int counter = hwc->idx;
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index 678ecff..66a2ffd 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -512,7 +512,7 @@ static inline int armv8pmu_select_counter(int idx)
return idx;
}
-static inline u32 armv8pmu_read_counter(struct perf_event *event)
+static inline u64 armv8pmu_read_counter(struct perf_event *event)
{
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
struct hw_perf_event *hwc = &event->hw;
@@ -530,7 +530,7 @@ static inline u32 armv8pmu_read_counter(struct perf_event *event)
return value;
}
-static inline void armv8pmu_write_counter(struct perf_event *event, u32 value)
+static inline void armv8pmu_write_counter(struct perf_event *event, u64 value)
{
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
struct hw_perf_event *hwc = &event->hw;
@@ -545,9 +545,8 @@ static inline void armv8pmu_write_counter(struct perf_event *event, u32 value)
* count using the lower 32bits and we want an interrupt when
* it overflows.
*/
- u64 value64 = 0xffffffff00000000ULL | value;
-
- write_sysreg(value64, pmccntr_el0);
+ value |= 0xffffffff00000000ULL;
+ write_sysreg(value, pmccntr_el0);
} else if (armv8pmu_select_counter(idx) == idx)
write_sysreg(value, pmxevcntr_el0);
}
diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
index 12c30a2..f7126a2 100644
--- a/include/linux/perf/arm_pmu.h
+++ b/include/linux/perf/arm_pmu.h
@@ -87,8 +87,8 @@ struct arm_pmu {
struct perf_event *event);
int (*set_event_filter)(struct hw_perf_event *evt,
struct perf_event_attr *attr);
- u32 (*read_counter)(struct perf_event *event);
- void (*write_counter)(struct perf_event *event, u32 val);
+ u64 (*read_counter)(struct perf_event *event);
+ void (*write_counter)(struct perf_event *event, u64 val);
void (*start)(struct arm_pmu *);
void (*stop)(struct arm_pmu *);
void (*reset)(void *);
--
2.7.4