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 8B19BC4708E for ; Thu, 5 Jan 2023 18:52:05 +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=0mrk2x2T6idgEmK9M9v8NxsDY9i7qltO5zSya6x5l8g=; b=iLJC7/Bwu09LgI N9ZClls1emuz/6c9crHgd7eEUSXZ8qfAHgAWGI80Ohkv/U+z/BGQATgpGRXFp6jI7qrY19PWbnEl8 C8BQZ2kSPTHknZKQIQ7mtMrddB8X/swrUFTUEGIFNpqxzgHsjZizr0sL8mhqz/EweLKYSGSFF0Sgz 821Ra6LnNa9R0ow54WIGdoNM4Q5qX8i20mAdxy5zv6S94D3G4UxnQIY5PCnqLb4yrezrxP8yTefiA vIpBOXiflYb9mMnxrWL4i57hM8aZrYIwAF0JbNY44liJIkr9VIQrV2Z4O/RcChLeDBxQETfFlfdfd ZfVyC0zVWzYYOa9ZILwQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pDVKX-00DqHF-Lw; Thu, 05 Jan 2023 18:51:09 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pDGeo-0009Re-Mg for linux-arm-kernel@lists.infradead.org; Thu, 05 Jan 2023 03:11:10 +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 1CF2016A3; Wed, 4 Jan 2023 19:11:44 -0800 (PST) Received: from a077893.blr.arm.com (unknown [10.162.43.6]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 02C443F663; Wed, 4 Jan 2023 19:10:59 -0800 (PST) From: Anshuman Khandual To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, mark.rutland@arm.com Cc: Anshuman Khandual , Catalin Marinas , Will Deacon Subject: [PATCH V7 3/6] arm64/perf: Add branch stack support in struct arm_pmu Date: Thu, 5 Jan 2023 08:40:36 +0530 Message-Id: <20230105031039.207972-4-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230105031039.207972-1-anshuman.khandual@arm.com> References: <20230105031039.207972-1-anshuman.khandual@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230104_191106_860925_BF82D9D0 X-CRM114-Status: GOOD ( 14.84 ) 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 later. This adds a new 'features' element in the structure to track supported features, and another 'private' element to encapsulate implementation attributes on a given 'struct arm_pmu'. These updates here will help in tracking any branch stack sampling support, which is being added later. This also adds a helper arm_pmu_branch_stack_supported(). 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_branch_stack_supported() 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 Signed-off-by: Anshuman Khandual --- drivers/perf/arm_pmu.c | 3 +-- include/linux/perf/arm_pmu.h | 9 +++++++++ 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index 14a3ed3bdb0b..a85b2d67022e 100644 --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -510,8 +510,7 @@ 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) && !arm_pmu_branch_stack_supported(armpmu)) 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 2a9d07cee927..64e1b2594025 100644 --- a/include/linux/perf/arm_pmu.h +++ b/include/linux/perf/arm_pmu.h @@ -80,11 +80,14 @@ enum armpmu_attr_groups { ARMPMU_NR_ATTR_GROUPS }; +#define ARM_PMU_BRANCH_STACK BIT(0) + struct arm_pmu { struct pmu pmu; cpumask_t supported_cpus; char *name; int pmuver; + int features; irqreturn_t (*handle_irq)(struct arm_pmu *pmu); void (*enable)(struct perf_event *event); void (*disable)(struct perf_event *event); @@ -119,8 +122,14 @@ struct arm_pmu { /* Only to be used by ACPI probing code */ unsigned long acpi_cpuid; + void *private; }; +static inline bool arm_pmu_branch_stack_supported(struct arm_pmu *armpmu) +{ + return armpmu->features & ARM_PMU_BRANCH_STACK; +} + #define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu)) u64 armpmu_event_update(struct perf_event *event); -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel