From nobody Tue Apr 7 10:40:45 2026 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 37907ECAAD2 for ; Mon, 29 Aug 2022 07:50:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229714AbiH2HuR (ORCPT ); Mon, 29 Aug 2022 03:50:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42812 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229447AbiH2HuI (ORCPT ); Mon, 29 Aug 2022 03:50:08 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 51B76B7CB; Mon, 29 Aug 2022 00:50:04 -0700 (PDT) Date: Mon, 29 Aug 2022 07:50:00 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1661759401; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=fO3ZTj6meGiDyhJqc5NyEivNjZrZ1xDwGlcPWQwXCF8=; b=jKlN3wT6MsxVoqu6RlSeVQMeQZ45pTNSGEHFdubXT5lNe+0byBiUbk0t19QDJehToxKfzF 7VtaH2d9Y3qiIL4f8PSHIx9PUZy2O0lY+1yw3nNbllu4zKwP4y+JpPsfksV54012yuBAuW vbZ9n4m6x7zbBc+P6Wo2p3DbGVSo2n7mph3dHVys7g3jK/qfhZ8/eETPLidF+vY+dTTSlv DaH0/+z7seXlQI5AI8/MTQ7U1wPnH6H98udoj/GAqPNXov7BEg826nBoqMZJ9FJgm27UWH kacw+3jid0Q15FOxzWs8gzcygiqL/vmg/mlkz7Yf9w6GJggG5T7cvUpUcblUpg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1661759401; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=fO3ZTj6meGiDyhJqc5NyEivNjZrZ1xDwGlcPWQwXCF8=; b=9Vr6cZOymKnYSrGBjc5jV5Lmi7MEaSOmSWS0axyIsUYXSBm4pLaQ283OA9MZxWDay8q8vs dVMY0jRbvJSZzpAQ== From: "tip-bot2 for Anshuman Khandual" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: perf/core] perf: Capture branch privilege information Cc: Anshuman Khandual , "Peter Zijlstra (Intel)" , James Clark , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20220824044822.70230-4-anshuman.khandual@arm.com> References: <20220824044822.70230-4-anshuman.khandual@arm.com> MIME-Version: 1.0 Message-ID: <166175940031.401.8517902436805331352.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the perf/core branch of tip: Commit-ID: 5402d25aa5710d240040f73fb13d7d5c303ef071 Gitweb: https://git.kernel.org/tip/5402d25aa5710d240040f73fb13d7d5c3= 03ef071 Author: Anshuman Khandual AuthorDate: Wed, 24 Aug 2022 10:18:17 +05:30 Committer: Peter Zijlstra CommitterDate: Mon, 29 Aug 2022 09:42:42 +02:00 perf: Capture branch privilege information 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. Signed-off-by: Anshuman Khandual Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: James Clark Link: https://lkml.kernel.org/r/20220824044822.70230-4-anshuman.khandual@ar= m.com --- 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_even= t.h index fed60e6..1a258d4 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 { =20 PERF_SAMPLE_BRANCH_HW_INDEX_SHIFT =3D 17, /* save low level index of raw = branch records */ =20 + PERF_SAMPLE_BRANCH_PRIV_SAVE_SHIFT =3D 18, /* save privilege mode */ + PERF_SAMPLE_BRANCH_MAX_SHIFT /* non-ABI */ }; =20 @@ -233,6 +235,8 @@ enum perf_branch_sample_type { =20 PERF_SAMPLE_BRANCH_HW_INDEX =3D 1U << PERF_SAMPLE_BRANCH_HW_INDEX_SHIFT, =20 + PERF_SAMPLE_BRANCH_PRIV_SAVE =3D 1U << PERF_SAMPLE_BRANCH_PRIV_SAVE_SHIFT, + PERF_SAMPLE_BRANCH_MAX =3D 1U << PERF_SAMPLE_BRANCH_MAX_SHIFT, }; =20 @@ -282,6 +286,13 @@ enum { PERF_BR_NEW_MAX, }; =20 +enum { + PERF_BR_PRIV_UNKNOWN =3D 0, + PERF_BR_PRIV_USER =3D 1, + PERF_BR_PRIV_KERNEL =3D 2, + PERF_BR_PRIV_HV =3D 3, +}; + #define PERF_SAMPLE_BRANCH_PLM_ALL \ (PERF_SAMPLE_BRANCH_USER|\ PERF_SAMPLE_BRANCH_KERNEL|\ @@ -1402,7 +1413,8 @@ struct perf_branch_entry { type:4, /* branch type */ spec:2, /* branch speculation info */ new_type:4, /* additional branch type */ - reserved:34; + priv:3, /* privilege level */ + reserved:31; }; =20 union perf_sample_weight {