linux-kernel - [PATCH 2/2] drivers: perf: added capabilities for legacy PMU

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Message-ID: <20231205092555.35617-2-vadim.shakirov@syntacore.com>
Date:   Tue, 5 Dec 2023 12:25:55 +0300
From:   Vadim Shakirov <vadim.shakirov@...tacore.com>
To:     Atish Patra <atishp@...shpatra.org>
CC:     Vadim Shakirov <vadim.shakirov@...tacore.com>,
        Anup Patel <anup@...infault.org>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        "Palmer Dabbelt" <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "Alexandre Ghiti" <alexghiti@...osinc.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] drivers: perf: added capabilities for legacy PMU

Added the PERF_PMU_CAP_NO_INTERRUPT flag because the legacy pmu driver
does not provide sampling capabilities

Added the PERF_PMU_CAP_NO_EXCLUDE flag because the legacy pmu driver
does not provide the ability to disable counter incrementation in
different privilege modes

Suggested-by: Atish Patra <atishp@...shpatra.org>
Signed-off-by: Vadim Shakirov <vadim.shakirov@...tacore.com>
---
 drivers/perf/riscv_pmu_legacy.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/perf/riscv_pmu_legacy.c b/drivers/perf/riscv_pmu_legacy.c
index a179ed6ac980..fa0bccf4edf2 100644
--- a/drivers/perf/riscv_pmu_legacy.c
+++ b/drivers/perf/riscv_pmu_legacy.c
@@ -123,6 +123,8 @@ static void pmu_legacy_init(struct riscv_pmu *pmu)
 	pmu->event_mapped = pmu_legacy_event_mapped;
 	pmu->event_unmapped = pmu_legacy_event_unmapped;
 	pmu->csr_index = pmu_legacy_csr_index;
+	pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
+	pmu->pmu.capabilities |= PERF_PMU_CAP_NO_EXCLUDE;
 
 	perf_pmu_register(&pmu->pmu, "cpu", PERF_TYPE_RAW);
 }
-- 
2.34.1