From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 6099330AABD; Wed, 13 Aug 2025 17:02:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755104569; cv=none; b=sbk4fRKXValQmjr+IAQxccpAMcS30cLrBTP0KKxY4jOBokA6/YFVTdanodXZzWAgUNuOGtj6NWvgPUTA233kQga/y29fUnVxbYVOJ2jUKTqnrXNUayHFF4s4ikLMOyiwH0Nj6hxlpUMU1CgLVM+VdE5yc+fZQviMT6wdeUiIHMQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755104569; c=relaxed/simple; bh=IxcE4QuQOlt2JPMHbQDsZJEZf0GC5polb4v+bvILzk4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=KuIXsyUgCJjpTuk5OkfRhuIQdnbxQGoVI3QM0xo/0L1P1BPAcrtxknCnHCar9XIUnZo+gyueXoCNipJvs3TFxNYZVRvs0ZR6BvYAMg1d+OR3Ekk8JYwTxZoPt3CV0SyLrc7FazzLPUKBfuMgGsFJsMUyWHKOinscENUosV4DoJw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 696B21E7D; Wed, 13 Aug 2025 10:02:38 -0700 (PDT) Received: from e121345-lin.cambridge.arm.com (e121345-lin.cambridge.arm.com [10.1.196.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 520FE3F77D; Wed, 13 Aug 2025 10:02:42 -0700 (PDT) From: Robin Murphy To: peterz@infradead.org, mingo@redhat.com, will@kernel.org, mark.rutland@arm.com, acme@kernel.org, namhyung@kernel.org, alexander.shishkin@linux.intel.com, jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com, kan.liang@linux.intel.com Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev, linux-csky@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-pm@vger.kernel.org, linux-rockchip@lists.infradead.org, dmaengine@vger.kernel.org, linux-fpga@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, coresight@lists.linaro.org, iommu@lists.linux.dev, linux-amlogic@lists.infradead.org, linux-cxl@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH 18/19] perf: Introduce positive capability for raw events Date: Wed, 13 Aug 2025 18:01:10 +0100 Message-Id: <542787fd188ea15ef41c53d557989c962ed44771.1755096883.git.robin.murphy@arm.com> X-Mailer: git-send-email 2.39.2.101.g768bb238c484.dirty In-Reply-To: References: Precedence: bulk X-Mailing-List: sparclinux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Only a handful of CPU PMUs accept PERF_TYPE_{RAW,HARDWARE,HW_CACHE} events without registering themselves as PERF_TYPE_RAW in the first place. Add an explicit opt-in for these special cases, so that we can make life easier for every other driver (and probably also speed up the slow-path search) by having perf_try_init_event() do the basic type checking to cover the majority of cases. Signed-off-by: Robin Murphy --- A further possibility is to automatically add the cap to PERF_TYPE_RAW PMUs in perf_pmu_register() to have a single point-of-use condition; I'm undecided... --- arch/s390/kernel/perf_cpum_cf.c | 1 + arch/s390/kernel/perf_pai_crypto.c | 2 +- arch/s390/kernel/perf_pai_ext.c | 2 +- arch/x86/events/core.c | 2 +- drivers/perf/arm_pmu.c | 1 + include/linux/perf_event.h | 1 + kernel/events/core.c | 15 +++++++++++++++ 7 files changed, 21 insertions(+), 3 deletions(-) diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c index 1a94e0944bc5..782ab755ddd4 100644 --- a/arch/s390/kernel/perf_cpum_cf.c +++ b/arch/s390/kernel/perf_cpum_cf.c @@ -1054,6 +1054,7 @@ static void cpumf_pmu_del(struct perf_event *event, int flags) /* Performance monitoring unit for s390x */ static struct pmu cpumf_pmu = { .task_ctx_nr = perf_sw_context, + .capabilities = PERF_PMU_CAP_RAW_EVENTS, .pmu_enable = cpumf_pmu_enable, .pmu_disable = cpumf_pmu_disable, .event_init = cpumf_pmu_event_init, diff --git a/arch/s390/kernel/perf_pai_crypto.c b/arch/s390/kernel/perf_pai_crypto.c index a64b6b056a21..b5b6d8b5d943 100644 --- a/arch/s390/kernel/perf_pai_crypto.c +++ b/arch/s390/kernel/perf_pai_crypto.c @@ -569,7 +569,7 @@ static const struct attribute_group *paicrypt_attr_groups[] = { /* Performance monitoring unit for mapped counters */ static struct pmu paicrypt = { .task_ctx_nr = perf_hw_context, - .capabilities = PERF_PMU_CAP_SAMPLING, + .capabilities = PERF_PMU_CAP_SAMPLING | PERF_PMU_CAP_RAW_EVENTS, .event_init = paicrypt_event_init, .add = paicrypt_add, .del = paicrypt_del, diff --git a/arch/s390/kernel/perf_pai_ext.c b/arch/s390/kernel/perf_pai_ext.c index 1261f80c6d52..bcd28c38da70 100644 --- a/arch/s390/kernel/perf_pai_ext.c +++ b/arch/s390/kernel/perf_pai_ext.c @@ -595,7 +595,7 @@ static const struct attribute_group *paiext_attr_groups[] = { /* Performance monitoring unit for mapped counters */ static struct pmu paiext = { .task_ctx_nr = perf_hw_context, - .capabilities = PERF_PMU_CAP_SAMPLING, + .capabilities = PERF_PMU_CAP_SAMPLING | PERF_PMU_CAP_RAW_EVENTS, .event_init = paiext_event_init, .add = paiext_add, .del = paiext_del, diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index 789dfca2fa67..764728bb80ae 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -2697,7 +2697,7 @@ static bool x86_pmu_filter(struct pmu *pmu, int cpu) } static struct pmu pmu = { - .capabilities = PERF_PMU_CAP_SAMPLING, + .capabilities = PERF_PMU_CAP_SAMPLING | PERF_PMU_CAP_RAW_EVENTS, .pmu_enable = x86_pmu_enable, .pmu_disable = x86_pmu_disable, diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index 72d8f38d0aa5..bc772a3bf411 100644 --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -877,6 +877,7 @@ struct arm_pmu *armpmu_alloc(void) * specific PMU. */ .capabilities = PERF_PMU_CAP_SAMPLING | + PERF_PMU_CAP_RAW_EVENTS | PERF_PMU_CAP_EXTENDED_REGS | PERF_PMU_CAP_EXTENDED_HW_TYPE, }; diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 183b7c48b329..c6ad036c0037 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -305,6 +305,7 @@ struct perf_event_pmu_context; #define PERF_PMU_CAP_EXTENDED_HW_TYPE 0x0100 #define PERF_PMU_CAP_AUX_PAUSE 0x0200 #define PERF_PMU_CAP_AUX_PREFER_LARGE 0x0400 +#define PERF_PMU_CAP_RAW_EVENTS 0x0800 /** * pmu::scope diff --git a/kernel/events/core.c b/kernel/events/core.c index 71b2a6730705..2ecee76d2ae2 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -12556,11 +12556,26 @@ static inline bool has_extended_regs(struct perf_event *event) (event->attr.sample_regs_intr & PERF_REG_EXTENDED_MASK); } +static bool is_raw_pmu(const struct pmu *pmu) +{ + return pmu->type == PERF_TYPE_RAW || + pmu->capabilities & PERF_PMU_CAP_RAW_EVENTS; +} + static int perf_try_init_event(struct pmu *pmu, struct perf_event *event) { struct perf_event_context *ctx = NULL; int ret; + /* + * Before touching anything, we can safely skip: + * - any event for a specific PMU which is not this one + * - any common event if this PMU doesn't support them + */ + if (event->attr.type != pmu->type && + (event->attr.type >= PERF_TYPE_MAX || is_raw_pmu(pmu))) + return -ENOENT; + if (!try_module_get(pmu->module)) return -ENODEV; -- 2.39.2.101.g768bb238c484.dirty