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 21BC8ECAAD5 for ; Thu, 8 Sep 2022 05:11:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229716AbiIHFLD (ORCPT ); Thu, 8 Sep 2022 01:11:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46116 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229498AbiIHFLA (ORCPT ); Thu, 8 Sep 2022 01:11:00 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 2645EB655E; Wed, 7 Sep 2022 22:10:57 -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 DFDC7D6E; Wed, 7 Sep 2022 22:11:03 -0700 (PDT) Received: from a077893.blr.arm.com (unknown [10.162.41.8]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 226C13F7B4; Wed, 7 Sep 2022 22:10:52 -0700 (PDT) From: Anshuman Khandual To: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-arm-kernel@lists.infradead.org, peterz@infradead.org, acme@kernel.org, mark.rutland@arm.com, will@kernel.org, catalin.marinas@arm.com Cc: Anshuman Khandual , James Clark , Rob Herring , Marc Zyngier , Ingo Molnar Subject: [PATCH V2 0/7] arm64/perf: Enable branch stack sampling Date: Thu, 8 Sep 2022 10:40:39 +0530 Message-Id: <20220908051046.465307-1-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 v6.0-rc4 after the BRBE related perf ABI changes series (V7) that was posted earlier, and a branch sample filter helper patch. https://lore.kernel.org/all/20220824044822.70230-1-anshuman.khandual@arm.com/ https://lore.kernel.org/all/20220906084414.396220-1-anshuman.khandual@arm.com/ Following issues have been resolved - Jame's concerns regarding permission inadequacy related to perfmon_capable() - Jame's concerns regarding using perf_event_paranoid along with perfmon_capable() Following issues remain inconclusive - Rob's concerns regarding the series structure, arm_pmu callbacks based framework Changes in V2: - Dropped branch sample filter helpers consolidation patch from this series - Added new hw_perf_event.flags element ARMPMU_EVT_PRIV to cache perfmon_capable() - Use cached perfmon_capable() while configuring BRBE branch record filters Changes in V1: https://lore.kernel.org/linux-arm-kernel/20220613100119.684673-1-anshuman.khandual@arm.com/ - Added CONFIG_PERF_EVENTS wrapper for all branch sample filter helpers - Process new perf branch types via PERF_BR_EXTEND_ABI Changes in RFC V2: https://lore.kernel.org/linux-arm-kernel/20220412115455.293119-1-anshuman.khandual@arm.com/ - 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 (7): 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 | 82 +++++- drivers/perf/arm_pmu_brbe.c | 448 ++++++++++++++++++++++++++++++++ drivers/perf/arm_pmu_brbe.h | 259 ++++++++++++++++++ drivers/perf/arm_pmu_platform.c | 34 +++ include/linux/perf/arm_pmu.h | 67 +++++ 9 files changed, 1169 insertions(+), 3 deletions(-) create mode 100644 drivers/perf/arm_pmu_brbe.c create mode 100644 drivers/perf/arm_pmu_brbe.h -- 2.25.1 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 9FE66C38145 for ; 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Thu, 08 Sep 2022 05:11:04 +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 1oW9oa-00GsK8-D7 for linux-arm-kernel@lists.infradead.org; Thu, 08 Sep 2022 05:11:02 +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 DFDC7D6E; Wed, 7 Sep 2022 22:11:03 -0700 (PDT) Received: from a077893.blr.arm.com (unknown [10.162.41.8]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 226C13F7B4; Wed, 7 Sep 2022 22:10:52 -0700 (PDT) From: Anshuman Khandual To: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-arm-kernel@lists.infradead.org, peterz@infradead.org, acme@kernel.org, mark.rutland@arm.com, will@kernel.org, catalin.marinas@arm.com Cc: Anshuman Khandual , James Clark , Rob Herring , Marc Zyngier , Ingo Molnar Subject: [PATCH V2 0/7] arm64/perf: Enable branch stack sampling Date: Thu, 8 Sep 2022 10:40:39 +0530 Message-Id: <20220908051046.465307-1-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-20220907_221100_584970_7E58DF5D X-CRM114-Status: GOOD ( 14.00 ) 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 v6.0-rc4 after the BRBE related perf ABI changes series (V7) that was posted earlier, and a branch sample filter helper patch. https://lore.kernel.org/all/20220824044822.70230-1-anshuman.khandual@arm.com/ https://lore.kernel.org/all/20220906084414.396220-1-anshuman.khandual@arm.com/ Following issues have been resolved - Jame's concerns regarding permission inadequacy related to perfmon_capable() - Jame's concerns regarding using perf_event_paranoid along with perfmon_capable() Following issues remain inconclusive - Rob's concerns regarding the series structure, arm_pmu callbacks based framework Changes in V2: - Dropped branch sample filter helpers consolidation patch from this series - Added new hw_perf_event.flags element ARMPMU_EVT_PRIV to cache perfmon_capable() - Use cached perfmon_capable() while configuring BRBE branch record filters Changes in V1: https://lore.kernel.org/linux-arm-kernel/20220613100119.684673-1-anshuman.khandual@arm.com/ - Added CONFIG_PERF_EVENTS wrapper for all branch sample filter helpers - Process new perf branch types via PERF_BR_EXTEND_ABI Changes in RFC V2: https://lore.kernel.org/linux-arm-kernel/20220412115455.293119-1-anshuman.khandual@arm.com/ - 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 (7): 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 | 82 +++++- drivers/perf/arm_pmu_brbe.c | 448 ++++++++++++++++++++++++++++++++ drivers/perf/arm_pmu_brbe.h | 259 ++++++++++++++++++ drivers/perf/arm_pmu_platform.c | 34 +++ include/linux/perf/arm_pmu.h | 67 +++++ 9 files changed, 1169 insertions(+), 3 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