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arm64: perf/kvm: Use a common PMU cycle counter define

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The PMUv3 and KVM code each have a define for the PMU cycle counter
index. Move KVM's define to a shared location and use it for PMUv3
driver.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Tested-by: James Clark <james.clark@linaro.org>
Link: https://lore.kernel.org/r/20240731-arm-pmu-3-9-icntr-v3-5-280a8d7ff465@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Rob Herring (Arm) 2024-07-31 10:51:22 -06:00 committed by Will Deacon
parent f9b11aa007
commit 126d7d7cce
4 changed files with 11 additions and 13 deletions
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1
arch/arm64/kvm/sys_regs.c
View File

@ -18,6 +18,7 @@
#include <linux/printk.h>
#include <linux/uaccess.h>
#include <asm/arm_pmuv3.h>
#include <asm/cacheflush.h>
#include <asm/cputype.h>
#include <asm/debug-monitors.h>

19
drivers/perf/arm_pmuv3.c
View File

@ -451,11 +451,6 @@ static const struct attribute_group armv8_pmuv3_caps_attr_group = {
.attrs = armv8_pmuv3_caps_attrs,
};
/*
* Perf Events' indices
*/
#define ARMV8_IDX_CYCLE_COUNTER 31
/*
* We unconditionally enable ARMv8.5-PMU long event counter support
* (64-bit events) where supported. Indicate if this arm_pmu has long
@ -574,7 +569,7 @@ static u64 armv8pmu_read_counter(struct perf_event *event)
int idx = hwc->idx;
u64 value;
if (idx == ARMV8_IDX_CYCLE_COUNTER)
if (idx == ARMV8_PMU_CYCLE_IDX)
value = read_pmccntr();
else
value = armv8pmu_read_hw_counter(event);
@ -607,7 +602,7 @@ static void armv8pmu_write_counter(struct perf_event *event, u64 value)
value = armv8pmu_bias_long_counter(event, value);
if (idx == ARMV8_IDX_CYCLE_COUNTER)
if (idx == ARMV8_PMU_CYCLE_IDX)
write_pmccntr(value);
else
armv8pmu_write_hw_counter(event, value);
@ -644,7 +639,7 @@ static void armv8pmu_write_event_type(struct perf_event *event)
armv8pmu_write_evtype(idx - 1, hwc->config_base);
armv8pmu_write_evtype(idx, chain_evt);
} else {
if (idx == ARMV8_IDX_CYCLE_COUNTER)
if (idx == ARMV8_PMU_CYCLE_IDX)
write_pmccfiltr(hwc->config_base);
else
armv8pmu_write_evtype(idx, hwc->config_base);
@ -772,7 +767,7 @@ static void armv8pmu_enable_user_access(struct arm_pmu *cpu_pmu)
/* Clear any unused counters to avoid leaking their contents */
for_each_andnot_bit(i, cpu_pmu->cntr_mask, cpuc->used_mask,
ARMPMU_MAX_HWEVENTS) {
if (i == ARMV8_IDX_CYCLE_COUNTER)
if (i == ARMV8_PMU_CYCLE_IDX)
write_pmccntr(0);
else
armv8pmu_write_evcntr(i, 0);
@ -933,8 +928,8 @@ static int armv8pmu_get_event_idx(struct pmu_hw_events *cpuc,
/* Always prefer to place a cycle counter into the cycle counter. */
if ((evtype == ARMV8_PMUV3_PERFCTR_CPU_CYCLES) &&
!armv8pmu_event_get_threshold(&event->attr)) {
if (!test_and_set_bit(ARMV8_IDX_CYCLE_COUNTER, cpuc->used_mask))
return ARMV8_IDX_CYCLE_COUNTER;
if (!test_and_set_bit(ARMV8_PMU_CYCLE_IDX, cpuc->used_mask))
return ARMV8_PMU_CYCLE_IDX;
else if (armv8pmu_event_is_64bit(event) &&
armv8pmu_event_want_user_access(event) &&
!armv8pmu_has_long_event(cpu_pmu))
@ -1196,7 +1191,7 @@ static void __armv8pmu_probe_pmu(void *info)
0, FIELD_GET(ARMV8_PMU_PMCR_N, armv8pmu_pmcr_read()));
/* Add the CPU cycles counter */
set_bit(ARMV8_IDX_CYCLE_COUNTER, cpu_pmu->cntr_mask);
set_bit(ARMV8_PMU_CYCLE_IDX, cpu_pmu->cntr_mask);
pmceid[0] = pmceid_raw[0] = read_pmceid0();
pmceid[1] = pmceid_raw[1] = read_pmceid1();

1
include/kvm/arm_pmu.h
View File

@ -10,7 +10,6 @@
#include <linux/perf_event.h>
#include <linux/perf/arm_pmuv3.h>
#define ARMV8_PMU_CYCLE_IDX (ARMV8_PMU_MAX_COUNTERS - 1)
#if IS_ENABLED(CONFIG_HW_PERF_EVENTS) && IS_ENABLED(CONFIG_KVM)
struct kvm_pmc {

3
include/linux/perf/arm_pmuv3.h
View File

@ -9,6 +9,9 @@
#define ARMV8_PMU_MAX_GENERAL_COUNTERS 31
#define ARMV8_PMU_MAX_COUNTERS 32
#define ARMV8_PMU_CYCLE_IDX 31
/*
* Common architectural and microarchitectural event numbers.
*/