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 14F94C433EF for ; Wed, 9 Mar 2022 03:39:04 +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=jFNOupLYGBi2OAdgkuPibjGw2OVNhnC1G+DL+nAFjAc=; b=ZtFEtU62sWV+co J95fEGDALQ0pms7Ed24tDQ6P48wZ0PXmzMzQ4ZQDwxWsJd5ohBoH0CkmrQp5msjlMEAOO8GCTICFj 8t/oI2e7vGXz2RKjM5xM6o7OhcVQ/uATiXJHehFfnvnqIyLp5m1bXHnDSVynIXb0t2T3SYelChwyB RmiASr6LLxfpBWpVrKXY3IqO/AMaIWObxNOE1dlptQfiSWHiN7H8Zad7H6XC1xRVABsZptPOi61la 8Ltg3eXoV1VaTJd4e/wXl8jiTxeHqoIRjZo7AVVijelij3r1LwztL0qeRvWSFlFRiH0Qz3jq5yoHy W7ITfZPl2cUv8JPEF91w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nRn96-0077Hq-Gs; Wed, 09 Mar 2022 03:37:52 +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 1nRn8j-00777r-Mz for linux-arm-kernel@lists.infradead.org; Wed, 09 Mar 2022 03:37:31 +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 23D8D1655; Tue, 8 Mar 2022 19:37:29 -0800 (PST) Received: from a077893.arm.com (unknown [10.163.52.241]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 857B43FA4D; Tue, 8 Mar 2022 19:37:23 -0800 (PST) From: Anshuman Khandual To: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, peterz@infradead.org, acme@kernel.org Cc: james.clark@arm.com, suzuki.poulose@arm.com, Anshuman Khandual , Ingo Molnar , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Thomas Gleixner , Will Deacon , linux-arm-kernel@lists.infradead.org Subject: [PATCH V2 4/8] perf: Capture branch privilege information Date: Wed, 9 Mar 2022 09:06:38 +0530 Message-Id: <20220309033642.144769-5-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220309033642.144769-1-anshuman.khandual@arm.com> References: <20220309033642.144769-1-anshuman.khandual@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220308_193729_827852_C2F52464 X-CRM114-Status: GOOD ( 13.14 ) 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 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 Signed-off-by: Anshuman Khandual --- include/uapi/linux/perf_event.h | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index d29280adc3c4..0e96e2017f68 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 privillege 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 +275,12 @@ enum { PERF_BR_NEW_MAX, }; +enum { + PERF_BR_USER = 0, + PERF_BR_KERNEL = 1, + PERF_BR_HV = 2, +}; + #define PERF_SAMPLE_BRANCH_PLM_ALL \ (PERF_SAMPLE_BRANCH_USER|\ PERF_SAMPLE_BRANCH_KERNEL|\ @@ -1386,7 +1396,8 @@ struct perf_branch_entry { cycles:16, /* cycle count to last branch */ type:4, /* branch type */ new_type:4, /* additional branch type */ - reserved:36; + priv:2, /* privilege level */ + reserved:34; }; union perf_sample_weight { -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel