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 5007DC433EF for ; Fri, 10 Jun 2022 03:51:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346255AbiFJDvi (ORCPT ); Thu, 9 Jun 2022 23:51:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43674 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346261AbiFJDve (ORCPT ); Thu, 9 Jun 2022 23:51:34 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 52C8E38AC8C; Thu, 9 Jun 2022 20:51:32 -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 19B451576; Thu, 9 Jun 2022 20:51:32 -0700 (PDT) Received: from a077893.blr.arm.com (unknown [10.162.42.8]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id EE5603F766; Thu, 9 Jun 2022 20:51:26 -0700 (PDT) From: Anshuman Khandual To: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, peterz@infradead.org, alexander.shishkin@linux.intel.com, jolsa@redhat.com, acme@kernel.org Cc: Anshuman Khandual , Robin Murphy , Suzuki Poulose , James Clark , Ingo Molnar , Mark Rutland , Namhyung Kim , Thomas Gleixner , Will Deacon , linux-arm-kernel@lists.infradead.org Subject: [PATCH V6 3/8] perf: Capture branch privilege information Date: Fri, 10 Jun 2022 09:20:56 +0530 Message-Id: <20220610035101.424112-4-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220610035101.424112-1-anshuman.khandual@arm.com> References: <20220610035101.424112-1-anshuman.khandual@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-perf-users@vger.kernel.org Platforms like arm64 could capture privilege level information for all the branch records. Hence this adds a new element in the struct branch_entry to record the privilege level information, which could be requested through a new event.attr.branch_sample_type based flag PERF_SAMPLE_BRANCH_PRIV_SAVE. This flag helps user choose whether privilege information is captured. Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Arnaldo Carvalho de Melo Cc: Mark Rutland Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Namhyung Kim Cc: Thomas Gleixner Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org Cc: linux-perf-users@vger.kernel.org Cc: linux-kernel@vger.kernel.org Reviewed-by: James Clark Signed-off-by: Anshuman Khandual --- include/uapi/linux/perf_event.h | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index d29280adc3c4..193dba2ecdc1 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -204,6 +204,8 @@ enum perf_branch_sample_type_shift { PERF_SAMPLE_BRANCH_HW_INDEX_SHIFT = 17, /* save low level index of raw branch records */ + PERF_SAMPLE_BRANCH_PRIV_SAVE_SHIFT = 18, /* save privilege mode */ + PERF_SAMPLE_BRANCH_MAX_SHIFT /* non-ABI */ }; @@ -233,6 +235,8 @@ enum perf_branch_sample_type { PERF_SAMPLE_BRANCH_HW_INDEX = 1U << PERF_SAMPLE_BRANCH_HW_INDEX_SHIFT, + PERF_SAMPLE_BRANCH_PRIV_SAVE = 1U << PERF_SAMPLE_BRANCH_PRIV_SAVE_SHIFT, + PERF_SAMPLE_BRANCH_MAX = 1U << PERF_SAMPLE_BRANCH_MAX_SHIFT, }; @@ -271,6 +275,13 @@ enum { PERF_BR_NEW_MAX, }; +enum { + PERF_BR_PRIV_UNKNOWN = 0, + PERF_BR_PRIV_USER = 1, + PERF_BR_PRIV_KERNEL = 2, + PERF_BR_PRIV_HV = 3, +}; + #define PERF_SAMPLE_BRANCH_PLM_ALL \ (PERF_SAMPLE_BRANCH_USER|\ PERF_SAMPLE_BRANCH_KERNEL|\ @@ -1386,7 +1397,8 @@ struct perf_branch_entry { cycles:16, /* cycle count to last branch */ type:4, /* branch type */ new_type:4, /* additional branch type */ - reserved:36; + priv:3, /* privilege level */ + reserved:33; }; union perf_sample_weight { -- 2.25.1