From: Atish Patra <atishp@atishpatra.org>
To: Alexandre Ghiti <alexghiti@rivosinc.com>
Cc: Jonathan Corbet <corbet@lwn.net>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Ian Rogers <irogers@google.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Anup Patel <anup@brainfault.org>, Will Deacon <will@kernel.org>,
Rob Herring <robh@kernel.org>,
Andrew Jones <ajones@ventanamicro.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-perf-users@vger.kernel.org,
linux-riscv@lists.infradead.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v4 06/10] drivers: perf: Implement perf event mmap support in the legacy backend
Date: Fri, 14 Jul 2023 01:03:29 -0700 [thread overview]
Message-ID: <CAOnJCULYD_Z32dupvTZZm7E6GnXaOy+R3yf7wqSy3ZMdd6eOFw@mail.gmail.com> (raw)
In-Reply-To: <20230703124647.215952-7-alexghiti@rivosinc.com>
On Mon, Jul 3, 2023 at 5:52 AM Alexandre Ghiti <alexghiti@rivosinc.com> wrote:
>
> Implement the needed callbacks in the legacy driver so that we can
> directly access the counters through perf in userspace.
>
> Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
> Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
> ---
> drivers/perf/riscv_pmu_legacy.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/drivers/perf/riscv_pmu_legacy.c b/drivers/perf/riscv_pmu_legacy.c
> index 6a000abc28bb..79fdd667922e 100644
> --- a/drivers/perf/riscv_pmu_legacy.c
> +++ b/drivers/perf/riscv_pmu_legacy.c
> @@ -71,6 +71,29 @@ static void pmu_legacy_ctr_start(struct perf_event *event, u64 ival)
> local64_set(&hwc->prev_count, initial_val);
> }
>
> +static uint8_t pmu_legacy_csr_index(struct perf_event *event)
> +{
> + return event->hw.idx;
> +}
> +
> +static void pmu_legacy_event_mapped(struct perf_event *event, struct mm_struct *mm)
> +{
> + if (event->attr.config != PERF_COUNT_HW_CPU_CYCLES &&
> + event->attr.config != PERF_COUNT_HW_INSTRUCTIONS)
> + return;
> +
> + event->hw.flags |= PERF_EVENT_FLAG_USER_READ_CNT;
> +}
> +
> +static void pmu_legacy_event_unmapped(struct perf_event *event, struct mm_struct *mm)
> +{
> + if (event->attr.config != PERF_COUNT_HW_CPU_CYCLES &&
> + event->attr.config != PERF_COUNT_HW_INSTRUCTIONS)
> + return;
> +
> + event->hw.flags &= ~PERF_EVENT_FLAG_USER_READ_CNT;
> +}
> +
> /*
> * This is just a simple implementation to allow legacy implementations
> * compatible with new RISC-V PMU driver framework.
> @@ -91,6 +114,9 @@ static void pmu_legacy_init(struct riscv_pmu *pmu)
> pmu->ctr_get_width = NULL;
> pmu->ctr_clear_idx = NULL;
> pmu->ctr_read = pmu_legacy_read_ctr;
> + pmu->event_mapped = pmu_legacy_event_mapped;
> + pmu->event_unmapped = pmu_legacy_event_unmapped;
> + pmu->csr_index = pmu_legacy_csr_index;
>
> perf_pmu_register(&pmu->pmu, "cpu", PERF_TYPE_RAW);
> }
> --
> 2.39.2
>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
--
Regards,
Atish
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next prev parent reply other threads:[~2023-07-14 8:03 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-03 12:46 [PATCH v4 00/10] riscv: Allow userspace to directly access perf counters Alexandre Ghiti
2023-07-03 12:46 ` [PATCH v4 01/10] perf: Fix wrong comment about default event_idx Alexandre Ghiti
2023-07-03 12:46 ` [PATCH v4 02/10] include: riscv: Fix wrong include guard in riscv_pmu.h Alexandre Ghiti
2023-07-03 12:46 ` [PATCH v4 03/10] riscv: Make legacy counter enum match the HW numbering Alexandre Ghiti
2023-07-14 8:01 ` Atish Patra
2023-07-03 12:46 ` [PATCH v4 04/10] drivers: perf: Rename riscv pmu sbi driver Alexandre Ghiti
2023-07-14 8:01 ` Atish Patra
2023-07-03 12:46 ` [PATCH v4 05/10] riscv: Prepare for user-space perf event mmap support Alexandre Ghiti
2023-07-14 8:03 ` Atish Patra
2023-07-03 12:46 ` [PATCH v4 06/10] drivers: perf: Implement perf event mmap support in the legacy backend Alexandre Ghiti
2023-07-14 8:03 ` Atish Patra [this message]
2023-07-03 12:46 ` [PATCH v4 07/10] drivers: perf: Implement perf event mmap support in the SBI backend Alexandre Ghiti
2023-07-14 8:46 ` Atish Patra
2023-07-20 8:36 ` Alexandre Ghiti
2023-07-03 12:46 ` [PATCH v4 08/10] Documentation: admin-guide: Add riscv sysctl_perf_user_access Alexandre Ghiti
2023-07-03 13:03 ` Andrew Jones
2023-07-04 12:28 ` Vince Weaver
2023-07-14 8:50 ` Atish Patra
2023-07-03 12:46 ` [PATCH v4 09/10] tools: lib: perf: Implement riscv mmap support Alexandre Ghiti
2023-07-14 9:29 ` Atish Patra
2023-07-03 12:46 ` [PATCH v4 10/10] perf: tests: Adapt mmap-basic.c for riscv Alexandre Ghiti
2023-07-14 9:29 ` Atish Patra
2023-07-14 9:07 ` [PATCH v4 00/10] riscv: Allow userspace to directly access perf counters Atish Patra
2023-07-17 13:35 ` Rémi Denis-Courmont
2023-07-17 23:22 ` Atish Patra
2023-07-18 17:06 ` Rémi Denis-Courmont
2023-07-18 18:45 ` Atish Patra
2023-07-18 19:04 ` Rémi Denis-Courmont
2023-07-18 22:48 ` Atish Patra
2023-07-19 14:45 ` Rémi Denis-Courmont
2023-07-19 17:14 ` Atish Patra
2023-07-20 9:13 ` Alexandre Ghiti
2023-07-27 14:14 Alexandre Ghiti
2023-07-27 14:14 ` [PATCH v4 06/10] drivers: perf: Implement perf event mmap support in the legacy backend Alexandre Ghiti
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