From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 57350EB64DD for ; Tue, 11 Jul 2023 08:26:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=VE/FR1VRvJnATCT7xZWLFOiTrB7CiFD5DLR/+hN/z7M=; b=JfL+E3eiGWbn8/ w/1bnSbTMH8TYj8XrdKUR6xflsRL1yjDcISSFQuNdGhBFvDrYOqlQr1h4pNZycdiq3d+4uX4f2gDU 3X+Mi3BtFrUncJi8hMH7e7UB2dJfekHNdy1hLz23K6KUmJzmoE9sBHhgx4wJ7wvEUUJ7XRmSNBaT5 FvfhVroLAlFE8Q2CxKb7NtokiH3xL2BTuU1bJ6jigf5EAJPln3WcEHRejjzJK8N/cDbedpRgoyVhH 7ctyFd6u3kGzCAoafcjasZH1CSC9Ru9epOs9f4MGoR7ButwDx1sJAaKpJ9kFN6GBFFF3f4xPQgXOs Od4tOOLNvvHxz51PFThg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qJ8gh-00E69m-36; Tue, 11 Jul 2023 08:25:35 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qJ8ga-00E66T-1Z for linux-arm-kernel@lists.infradead.org; Tue, 11 Jul 2023 08:25:30 +0000 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 D984F2B; Tue, 11 Jul 2023 01:26:08 -0700 (PDT) Received: from a077893.arm.com (unknown [10.163.47.87]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id AB0F63F740; Tue, 11 Jul 2023 01:25:21 -0700 (PDT) From: Anshuman Khandual To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, will@kernel.org, catalin.marinas@arm.com, mark.rutland@arm.com Cc: Anshuman Khandual , Mark Brown , James Clark , Rob Herring , Marc Zyngier , Suzuki Poulose , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , linux-perf-users@vger.kernel.org Subject: [PATCH V13 - RESEND 03/10] arm64/perf: Add branch stack support in struct arm_pmu Date: Tue, 11 Jul 2023 13:54:48 +0530 Message-Id: <20230711082455.215983-4-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230711082455.215983-1-anshuman.khandual@arm.com> References: <20230711082455.215983-1-anshuman.khandual@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230711_012528_576186_A6C4BFDF X-CRM114-Status: GOOD ( 14.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This updates 'struct arm_pmu' for branch stack sampling support being added later. This adds an element 'reg_trbidr' to capture BRBE attribute details. These updates here will help in tracking any branch stack sampling support. This also enables perf branch stack sampling event on all 'struct arm pmu', supporting the feature but after removing the current gate that blocks such events unconditionally in armpmu_event_init(). Instead a quick probe can be initiated via arm_pmu->has_branch_stack to ascertain the support. Cc: Catalin Marinas Cc: Will Deacon Cc: Mark Rutland Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Tested-by: James Clark Signed-off-by: Anshuman Khandual --- drivers/perf/arm_pmu.c | 3 +-- include/linux/perf/arm_pmu.h | 9 ++++++++- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index c0475a96c2a0..fe456a46fe8d 100644 --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -512,8 +512,7 @@ static int armpmu_event_init(struct perf_event *event) !cpumask_test_cpu(event->cpu, &armpmu->supported_cpus)) return -ENOENT; - /* does not support taken branch sampling */ - if (has_branch_stack(event)) + if (has_branch_stack(event) && !armpmu->has_branch_stack) return -EOPNOTSUPP; return __hw_perf_event_init(event); diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h index 3d3bd944d630..5ecd3d0e7645 100644 --- a/include/linux/perf/arm_pmu.h +++ b/include/linux/perf/arm_pmu.h @@ -104,7 +104,9 @@ struct arm_pmu { int (*map_event)(struct perf_event *event); void (*sched_task)(struct perf_event_pmu_context *pmu_ctx, bool sched_in); int num_events; - bool secure_access; /* 32-bit ARM only */ + unsigned int secure_access : 1, /* 32-bit ARM only */ + has_branch_stack: 1, /* 64-bit ARM only */ + reserved : 30; #define ARMV8_PMUV3_MAX_COMMON_EVENTS 0x40 DECLARE_BITMAP(pmceid_bitmap, ARMV8_PMUV3_MAX_COMMON_EVENTS); #define ARMV8_PMUV3_EXT_COMMON_EVENT_BASE 0x4000 @@ -120,6 +122,11 @@ struct arm_pmu { /* Only to be used by ACPI probing code */ unsigned long acpi_cpuid; + + /* Implementation specific attributes */ +#ifdef CONFIG_ARM64_BRBE + u64 reg_brbidr; +#endif }; #define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu)) -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel