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 A7A2CC433EF for ; Tue, 12 Apr 2022 11:56:14 +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: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:In-Reply-To:References: List-Owner; bh=Qe3OFogNBKgAcwlBPlsJPzs1py8PypqmOT+WWobbaAs=; b=4n/13bwRZ3KSDD 6DOzpMpcy+rVi21XELgeReEW4eCV7i7tOLMqmxKdqnZkOwwyZL1fM/fT/eW/B8RQzsB/OucnQCULI BFpEQAlt1VAMER6BpmrXMKhtQUdLx3Vt1k4cMhm8dldUtQpqxRO/kU93DMcgRNBvWDmX1ZaXs8pWu S9X08jDJzoxM8/gzshpHRTLEj5jPBtskTHyMTR8z8GXFL9Sv/RtITnwakOAfdWPPxS8NRRt3icfrW +KwDFqEL5r0JUbCIVn3sviGroY918paFsUeoHTIEC/AdJ3YDv/lsZMEuN+rCdhdaLXQJO0hsGMoN1 4iUDUF815ydlUhkgRi8A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1neF6i-00DsH8-5G; Tue, 12 Apr 2022 11:54:52 +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 1neF6Z-00DsDL-PB for linux-arm-kernel@lists.infradead.org; Tue, 12 Apr 2022 11:54:45 +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 3641A1424; Tue, 12 Apr 2022 04:54:39 -0700 (PDT) Received: from a077893.arm.com (unknown [10.163.38.213]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id E47C63F70D; Tue, 12 Apr 2022 04:54:32 -0700 (PDT) From: Anshuman Khandual To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Anshuman Khandual , Catalin Marinas , Will Deacon , Mark Rutland , James Clark , Rob Herring , Marc Zyngier , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , linux-perf-users@vger.kernel.org Subject: [RFC V2 0/8] arm64/perf: Enable branch stack sampling Date: Tue, 12 Apr 2022 17:24:47 +0530 Message-Id: <20220412115455.293119-1-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220412_045443_969949_8C0E6858 X-CRM114-Status: GOOD ( 13.43 ) 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 series enables perf branch stack sampling support on arm64 platform via a new arch feature called Branch Record Buffer Extension (BRBE). All relevant register definitions could be accessed here. https://developer.arm.com/documentation/ddi0601/2021-12/AArch64-Registers This series applies on v5.18-rc1 after the BRBE related perf ABI changes series (V5) that was posted earlier. https://lore.kernel.org/all/20220404045046.634522-2-anshuman.khandual@arm.com/ Following issues remain inconclusive - Jame's concerns regarding permission inadequacy related to perfmon_capable() - Jame's concerns regarding using perf_event_paranoid along with perfmon_capable() - Rob's concerns regarding the series structure, arm_pmu callbacks based framework Changes in RFC V2: - Added branch_sample_priv() while consolidating other branch sample filter helpers - Changed all SYS_BRBXXXN_EL1 register definition encodings per Marc - Changed the BRBE driver as per proposed BRBE related perf ABI changes (V5) - Added documentation for struct arm_pmu changes, updated commit message - Updated commit message for BRBE detection infrastructure patch - PERF_SAMPLE_BRANCH_KERNEL gets checked during arm event init (outside the driver) - Branch privilege state capture mechanism has now moved inside the driver Changes in RFC V1: https://lore.kernel.org/all/1642998653-21377-1-git-send-email-anshuman.khandual@arm.com/ Cc: Catalin Marinas Cc: Will Deacon Cc: Mark Rutland Cc: James Clark Cc: Rob Herring Cc: Marc Zyngier Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Arnaldo Carvalho de Melo Cc: linux-arm-kernel@lists.infradead.org Cc: linux-perf-users@vger.kernel.org Cc: linux-kernel@vger.kernel.org Anshuman Khandual (8): perf: Consolidate branch sample filter helpers arm64/perf: Add register definitions for BRBE arm64/perf: Update struct arm_pmu for BRBE arm64/perf: Update struct pmu_hw_events for BRBE driver/perf/arm_pmu_platform: Add support for BRBE attributes detection arm64/perf: Drive BRBE from perf event states arm64/perf: Add BRBE driver arm64/perf: Enable branch stack sampling arch/arm64/include/asm/sysreg.h | 222 +++++++++++++++++ arch/arm64/kernel/perf_event.c | 48 ++++ drivers/perf/Kconfig | 11 + drivers/perf/Makefile | 1 + drivers/perf/arm_pmu.c | 72 +++++- drivers/perf/arm_pmu_brbe.c | 425 ++++++++++++++++++++++++++++++++ drivers/perf/arm_pmu_brbe.h | 259 +++++++++++++++++++ drivers/perf/arm_pmu_platform.c | 34 +++ include/linux/perf/arm_pmu.h | 63 +++++ include/linux/perf_event.h | 24 ++ kernel/events/core.c | 9 +- 11 files changed, 1158 insertions(+), 10 deletions(-) create mode 100644 drivers/perf/arm_pmu_brbe.c create mode 100644 drivers/perf/arm_pmu_brbe.h -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 17113C433F5 for ; Tue, 12 Apr 2022 12:33:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347461AbiDLMgO (ORCPT ); Tue, 12 Apr 2022 08:36:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57576 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348114AbiDLMft (ORCPT ); Tue, 12 Apr 2022 08:35:49 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 363E513FB4; Tue, 12 Apr 2022 04:54:39 -0700 (PDT) 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 3641A1424; Tue, 12 Apr 2022 04:54:39 -0700 (PDT) Received: from a077893.arm.com (unknown [10.163.38.213]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id E47C63F70D; Tue, 12 Apr 2022 04:54:32 -0700 (PDT) From: Anshuman Khandual To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Anshuman Khandual , Catalin Marinas , Will Deacon , Mark Rutland , James Clark , Rob Herring , Marc Zyngier , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , linux-perf-users@vger.kernel.org Subject: [RFC V2 0/8] arm64/perf: Enable branch stack sampling Date: Tue, 12 Apr 2022 17:24:47 +0530 Message-Id: <20220412115455.293119-1-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This series enables perf branch stack sampling support on arm64 platform via a new arch feature called Branch Record Buffer Extension (BRBE). All relevant register definitions could be accessed here. https://developer.arm.com/documentation/ddi0601/2021-12/AArch64-Registers This series applies on v5.18-rc1 after the BRBE related perf ABI changes series (V5) that was posted earlier. https://lore.kernel.org/all/20220404045046.634522-2-anshuman.khandual@arm.com/ Following issues remain inconclusive - Jame's concerns regarding permission inadequacy related to perfmon_capable() - Jame's concerns regarding using perf_event_paranoid along with perfmon_capable() - Rob's concerns regarding the series structure, arm_pmu callbacks based framework Changes in RFC V2: - Added branch_sample_priv() while consolidating other branch sample filter helpers - Changed all SYS_BRBXXXN_EL1 register definition encodings per Marc - Changed the BRBE driver as per proposed BRBE related perf ABI changes (V5) - Added documentation for struct arm_pmu changes, updated commit message - Updated commit message for BRBE detection infrastructure patch - PERF_SAMPLE_BRANCH_KERNEL gets checked during arm event init (outside the driver) - Branch privilege state capture mechanism has now moved inside the driver Changes in RFC V1: https://lore.kernel.org/all/1642998653-21377-1-git-send-email-anshuman.khandual@arm.com/ Cc: Catalin Marinas Cc: Will Deacon Cc: Mark Rutland Cc: James Clark Cc: Rob Herring Cc: Marc Zyngier Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Arnaldo Carvalho de Melo Cc: linux-arm-kernel@lists.infradead.org Cc: linux-perf-users@vger.kernel.org Cc: linux-kernel@vger.kernel.org Anshuman Khandual (8): perf: Consolidate branch sample filter helpers arm64/perf: Add register definitions for BRBE arm64/perf: Update struct arm_pmu for BRBE arm64/perf: Update struct pmu_hw_events for BRBE driver/perf/arm_pmu_platform: Add support for BRBE attributes detection arm64/perf: Drive BRBE from perf event states arm64/perf: Add BRBE driver arm64/perf: Enable branch stack sampling arch/arm64/include/asm/sysreg.h | 222 +++++++++++++++++ arch/arm64/kernel/perf_event.c | 48 ++++ drivers/perf/Kconfig | 11 + drivers/perf/Makefile | 1 + drivers/perf/arm_pmu.c | 72 +++++- drivers/perf/arm_pmu_brbe.c | 425 ++++++++++++++++++++++++++++++++ drivers/perf/arm_pmu_brbe.h | 259 +++++++++++++++++++ drivers/perf/arm_pmu_platform.c | 34 +++ include/linux/perf/arm_pmu.h | 63 +++++ include/linux/perf_event.h | 24 ++ kernel/events/core.c | 9 +- 11 files changed, 1158 insertions(+), 10 deletions(-) create mode 100644 drivers/perf/arm_pmu_brbe.c create mode 100644 drivers/perf/arm_pmu_brbe.h -- 2.25.1