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[92.145.124.62]) by smtp.gmail.com with ESMTPSA id g8-20020adff3c8000000b003078354f774sm21229104wrp.36.2023.05.12.01.59.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 01:59:59 -0700 (PDT) From: Alexandre Ghiti To: Jonathan Corbet , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Ian Rogers , Paul Walmsley , Palmer Dabbelt , Albert Ou , Atish Patra , Anup Patel , Will Deacon , Rob Herring , Andrew Jones , 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 Cc: Alexandre Ghiti Subject: [PATCH v2 06/10] drivers: perf: Implement perf event mmap support in the legacy backend Date: Fri, 12 May 2023 10:53:17 +0200 Message-Id: <20230512085321.13259-7-alexghiti@rivosinc.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230512085321.13259-1-alexghiti@rivosinc.com> References: <20230512085321.13259-1-alexghiti@rivosinc.com> MIME-Version: 1.0 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1765678935787135694?= X-GMAIL-MSGID: =?utf-8?q?1765678935787135694?= 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 Reviewed-by: Andrew Jones --- drivers/perf/riscv_pmu_legacy.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/perf/riscv_pmu_legacy.c b/drivers/perf/riscv_pmu_legacy.c index ffe09d857366..f0f5bd856f66 100644 --- a/drivers/perf/riscv_pmu_legacy.c +++ b/drivers/perf/riscv_pmu_legacy.c @@ -74,6 +74,31 @@ 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) +{ + /* In legacy mode, the first 3 CSRs are available. */ + 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) +{ + /* In legacy mode, the first 3 CSRs are available. */ + 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. @@ -94,6 +119,9 @@ 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, RISCV_PMU_LEGACY_PDEV_NAME, PERF_TYPE_RAW); }