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Message-Id: <570168c4f553539eb02209d1440ad981a7e95c7e.1452766568.git.jglauber@cavium.com>
Date: Thu, 14 Jan 2016 13:55:45 +0100
From: Jan Glauber <jan.glauber@...il.com>
To: Will Deacon <will.deacon@....com>,
Mark Rutland <mark.rutland@....com>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Jan Glauber <jglauber@...ium.com>
Subject: [RFC PATCH 5/5] arm64/perf: Extend event mask for ARMv8.1
ARMv8.1 increases the PMU event number space. Detect the
presence of this PMUv3 type and extend the event mask.
The event mask is moved to struct arm_pmu so different event masks
can exist, depending on the PMU type.
Signed-off-by: Jan Glauber <jglauber@...ium.com>
---
arch/arm64/kernel/perf_event.c | 33 +++++++++++++++++++--------------
drivers/perf/arm_pmu.c | 5 +++--
include/linux/perf/arm_pmu.h | 4 ++--
3 files changed, 24 insertions(+), 18 deletions(-)
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index d8d5d59..d448a75 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -419,7 +419,7 @@ static const struct attribute_group *armv8_pmuv3_attr_groups[] = {
/*
* PMXEVTYPER: Event selection reg
*/
-#define ARMV8_EVTYPE_MASK 0xc80003ff /* Mask for writable bits */
+#define ARMV8_EVTYPE_FLT_MASK 0xc8000000 /* Writable filter bits */
#define ARMV8_EVTYPE_EVENT 0x3ff /* Mask for EVENT bits */
/*
@@ -510,10 +510,8 @@ static inline void armv8pmu_write_counter(struct perf_event *event, u32 value)
static inline void armv8pmu_write_evtype(int idx, u32 val)
{
- if (armv8pmu_select_counter(idx) == idx) {
- val &= ARMV8_EVTYPE_MASK;
+ if (armv8pmu_select_counter(idx) == idx)
asm volatile("msr pmxevtyper_el0, %0" :: "r" (val));
- }
}
static inline int armv8pmu_enable_counter(int idx)
@@ -570,6 +568,7 @@ static void armv8pmu_enable_event(struct perf_event *event)
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
int idx = hwc->idx;
+ u32 val;
/*
* Enable counter and interrupt, and set the counter to count
@@ -585,7 +584,8 @@ static void armv8pmu_enable_event(struct perf_event *event)
/*
* Set event (if destined for PMNx counters).
*/
- armv8pmu_write_evtype(idx, hwc->config_base);
+ val = hwc->config_base & (ARMV8_EVTYPE_FLT_MASK | cpu_pmu->event_mask);
+ armv8pmu_write_evtype(idx, val);
/*
* Enable interrupt for this counter
@@ -716,7 +716,7 @@ static int armv8pmu_get_event_idx(struct pmu_hw_events *cpuc,
int idx;
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
struct hw_perf_event *hwc = &event->hw;
- unsigned long evtype = hwc->config_base & ARMV8_EVTYPE_EVENT;
+ unsigned long evtype = hwc->config_base & cpu_pmu->event_mask;
/* Always place a cycle counter into the cycle counter. */
if (evtype == ARMV8_PMUV3_PERFCTR_CLOCK_CYCLES) {
@@ -786,29 +786,25 @@ static void armv8pmu_reset(void *info)
static int armv8_pmuv3_map_event(struct perf_event *event)
{
return armpmu_map_event(event, &armv8_pmuv3_perf_map,
- &armv8_pmuv3_perf_cache_map,
- ARMV8_EVTYPE_EVENT);
+ &armv8_pmuv3_perf_cache_map);
}
static int armv8_a53_map_event(struct perf_event *event)
{
return armpmu_map_event(event, &armv8_a53_perf_map,
- &armv8_a53_perf_cache_map,
- ARMV8_EVTYPE_EVENT);
+ &armv8_a53_perf_cache_map);
}
static int armv8_a57_map_event(struct perf_event *event)
{
return armpmu_map_event(event, &armv8_a57_perf_map,
- &armv8_a57_perf_cache_map,
- ARMV8_EVTYPE_EVENT);
+ &armv8_a57_perf_cache_map);
}
static int armv8_thunderx_map_event(struct perf_event *event)
{
return armpmu_map_event(event, &armv8_thunderx_perf_map,
- &armv8_thunderx_perf_cache_map,
- ARMV8_EVTYPE_EVENT);
+ &armv8_thunderx_perf_cache_map);
}
static void armv8pmu_read_num_pmnc_events(void *info)
@@ -831,6 +827,8 @@ static int armv8pmu_probe_num_events(struct arm_pmu *arm_pmu)
static void armv8_pmu_init(struct arm_pmu *cpu_pmu)
{
+ u64 id;
+
cpu_pmu->handle_irq = armv8pmu_handle_irq,
cpu_pmu->enable = armv8pmu_enable_event,
cpu_pmu->disable = armv8pmu_disable_event,
@@ -842,6 +840,13 @@ static void armv8_pmu_init(struct arm_pmu *cpu_pmu)
cpu_pmu->reset = armv8pmu_reset,
cpu_pmu->max_period = (1LLU << 32) - 1,
cpu_pmu->set_event_filter = armv8pmu_set_event_filter;
+
+ /* detect ARMv8.1 PMUv3 with extended event mask */
+ id = read_cpuid(ID_AA64DFR0_EL1);
+ if (((id >> 8) & 0xf) == 4)
+ cpu_pmu->event_mask = 0xffff; /* ARMv8.1 extended events */
+ else
+ cpu_pmu->event_mask = ARMV8_EVTYPE_EVENT;
}
static int armv8_pmuv3_init(struct arm_pmu *cpu_pmu)
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 166637f..79e681f 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -79,9 +79,10 @@ armpmu_map_event(struct perf_event *event,
const unsigned (*cache_map)
[PERF_COUNT_HW_CACHE_MAX]
[PERF_COUNT_HW_CACHE_OP_MAX]
- [PERF_COUNT_HW_CACHE_RESULT_MAX],
- u32 raw_event_mask)
+ [PERF_COUNT_HW_CACHE_RESULT_MAX])
{
+ struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
+ u32 raw_event_mask = armpmu->event_mask;
u64 config = event->attr.config;
int type = event->attr.type;
diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
index 83b5e34..9a4c3a9 100644
--- a/include/linux/perf/arm_pmu.h
+++ b/include/linux/perf/arm_pmu.h
@@ -101,6 +101,7 @@ struct arm_pmu {
void (*free_irq)(struct arm_pmu *);
int (*map_event)(struct perf_event *event);
int num_events;
+ int event_mask;
atomic_t active_events;
struct mutex reserve_mutex;
u64 max_period;
@@ -119,8 +120,7 @@ int armpmu_map_event(struct perf_event *event,
const unsigned (*event_map)[PERF_COUNT_HW_MAX],
const unsigned (*cache_map)[PERF_COUNT_HW_CACHE_MAX]
[PERF_COUNT_HW_CACHE_OP_MAX]
- [PERF_COUNT_HW_CACHE_RESULT_MAX],
- u32 raw_event_mask);
+ [PERF_COUNT_HW_CACHE_RESULT_MAX]);
struct pmu_probe_info {
unsigned int cpuid;
--
1.9.1
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