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 46D6BC433EF for ; Mon, 13 Jun 2022 10:01:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231440AbiFMKBq (ORCPT ); Mon, 13 Jun 2022 06:01:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39530 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235736AbiFMKBn (ORCPT ); Mon, 13 Jun 2022 06:01:43 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 88ABD1D0F4; Mon, 13 Jun 2022 03:01:35 -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 08C11D6E; Mon, 13 Jun 2022 03:01:35 -0700 (PDT) Received: from a077893.arm.com (unknown [10.163.38.134]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id C11BB3F66F; Mon, 13 Jun 2022 03:01:28 -0700 (PDT) From: Anshuman Khandual To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, peterz@infradead.org, acme@kernel.org, mark.rutland@arm.com, will@kernel.org Cc: Anshuman Khandual , Catalin Marinas , James Clark , Rob Herring , Marc Zyngier , Ingo Molnar , linux-perf-users@vger.kernel.org Subject: [PATCH 0/8] arm64/perf: Enable branch stack sampling Date: Mon, 13 Jun 2022 15:31:11 +0530 Message-Id: <20220613100119.684673-1-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-perf-users@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 v5.19-rc2 after the BRBE related perf ABI changes series (V6) that was posted earlier. https://lore.kernel.org/linux-arm-kernel/20220610035101.424112-1-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 V1: - 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 (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 | 442 ++++++++++++++++++++++++++++++++ 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 | 26 ++ kernel/events/core.c | 9 +- 11 files changed, 1177 insertions(+), 10 deletions(-) create mode 100644 drivers/perf/arm_pmu_brbe.c create mode 100644 drivers/perf/arm_pmu_brbe.h -- 2.25.1