diff options
| author | Marc Zyngier <marc.zyngier@arm.com> | 2023-03-17 22:50:26 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2023-03-27 16:01:18 +0300 |
| commit | 009d6dc87a568db62290b8dc0a517b612217b6da (patch) | |
| tree | 54700b4d444371659a00aa42fefc206bb1e4e684 /drivers/perf/arm_pmuv3.c | |
| parent | 252309adc81f529d42c8c90a4965866ec82cb6ad (diff) | |
| download | linux-009d6dc87a568db62290b8dc0a517b612217b6da.tar.xz | |
ARM: perf: Allow the use of the PMUv3 driver on 32bit ARM
The only thing stopping the PMUv3 driver from compiling on 32bit
is the lack of defined system registers names and the handful of
required helpers.
This is easily solved by providing the sysreg accessors and updating
the Kconfig entry.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Co-developed-by: Zaid Al-Bassam <zalbassam@google.com>
Signed-off-by: Zaid Al-Bassam <zalbassam@google.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230317195027.3746949-8-zalbassam@google.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/perf/arm_pmuv3.c')
| -rw-r--r-- | drivers/perf/arm_pmuv3.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c index fc8ed3cd0330..34ed0d5d7898 100644 --- a/drivers/perf/arm_pmuv3.c +++ b/drivers/perf/arm_pmuv3.c @@ -388,10 +388,13 @@ static const struct attribute_group armv8_pmuv3_caps_attr_group = { * We unconditionally enable ARMv8.5-PMU long event counter support * (64-bit events) where supported. Indicate if this arm_pmu has long * event counter support. + * + * On AArch32, long counters make no sense (you can't access the top + * bits), so we only enable this on AArch64. */ static bool armv8pmu_has_long_event(struct arm_pmu *cpu_pmu) { - return (is_pmuv3p5(cpu_pmu->pmuver)); + return (IS_ENABLED(CONFIG_ARM64) && is_pmuv3p5(cpu_pmu->pmuver)); } static inline bool armv8pmu_event_has_user_read(struct perf_event *event) |