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From: Alexandre Ghiti <alexghiti@rivosinc.com>
To: Jonathan Corbet <corbet@lwn.net>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
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Atish Patra <atishp@atishpatra.org>,
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Will Deacon <will@kernel.org>, Rob Herring <robh@kernel.org>,
Andrew Jones <ajones@ventanamicro.com>,
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Cc: Alexandre Ghiti <alexghiti@rivosinc.com>
Subject: [PATCH v4 03/10] riscv: Make legacy counter enum match the HW
numbering
Date: Mon, 3 Jul 2023 14:46:40 +0200
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| Series |
riscv: Allow userspace to directly access perf counters
|
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Commit Message
Alexandre Ghiti
July 3, 2023, 12:46 p.m. UTC
RISCV_PMU_LEGACY_INSTRET used to be set to 1 whereas the offset of this hardware counter from CSR_CYCLE is actually 2: make this offset match the real hw offset so that we can directly expose those values to userspace. Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> --- drivers/perf/riscv_pmu_legacy.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
Comments
On Mon, Jul 3, 2023 at 5:49 AM Alexandre Ghiti <alexghiti@rivosinc.com> wrote: > > RISCV_PMU_LEGACY_INSTRET used to be set to 1 whereas the offset of this > hardware counter from CSR_CYCLE is actually 2: make this offset match the > real hw offset so that we can directly expose those values to userspace. > > Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> > Reviewed-by: Andrew Jones <ajones@ventanamicro.com> > --- > drivers/perf/riscv_pmu_legacy.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/perf/riscv_pmu_legacy.c b/drivers/perf/riscv_pmu_legacy.c > index ca9e20bfc7ac..6a000abc28bb 100644 > --- a/drivers/perf/riscv_pmu_legacy.c > +++ b/drivers/perf/riscv_pmu_legacy.c > @@ -13,7 +13,7 @@ > #include <linux/platform_device.h> > > #define RISCV_PMU_LEGACY_CYCLE 0 > -#define RISCV_PMU_LEGACY_INSTRET 1 > +#define RISCV_PMU_LEGACY_INSTRET 2 > > static bool pmu_init_done; > > -- > 2.39.2 > Reviewed-by: Atish Patra <atishp@rivosinc.com>
diff --git a/drivers/perf/riscv_pmu_legacy.c b/drivers/perf/riscv_pmu_legacy.c index ca9e20bfc7ac..6a000abc28bb 100644 --- a/drivers/perf/riscv_pmu_legacy.c +++ b/drivers/perf/riscv_pmu_legacy.c @@ -13,7 +13,7 @@ #include <linux/platform_device.h> #define RISCV_PMU_LEGACY_CYCLE 0 -#define RISCV_PMU_LEGACY_INSTRET 1 +#define RISCV_PMU_LEGACY_INSTRET 2 static bool pmu_init_done;