From nobody Fri Dec 19 09:45:07 2025 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 7A50FC4167B for ; Thu, 7 Dec 2023 14:31:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1443107AbjLGOa7 convert rfc822-to-8bit (ORCPT ); Thu, 7 Dec 2023 09:30:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56718 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1443309AbjLGOaz (ORCPT ); Thu, 7 Dec 2023 09:30:55 -0500 Received: from ex01.ufhost.com (ex01.ufhost.com [61.152.239.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8CEF610F7; Thu, 7 Dec 2023 06:30:59 -0800 (PST) Received: from EXMBX166.cuchost.com (unknown [175.102.18.54]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "EXMBX166", Issuer "EXMBX166" (not verified)) by ex01.ufhost.com (Postfix) with ESMTP id EE40C24E260; Thu, 7 Dec 2023 22:30:53 +0800 (CST) Received: from EXMBX072.cuchost.com (172.16.6.82) by EXMBX166.cuchost.com (172.16.6.76) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Thu, 7 Dec 2023 22:30:53 +0800 Received: from localhost.localdomain (202.188.176.82) by EXMBX072.cuchost.com (172.16.6.82) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Thu, 7 Dec 2023 22:30:47 +0800 From: Ji Sheng Teoh To: Jonathan Corbet , Will Deacon , "Mark Rutland" , Rob Herring , "Krzysztof Kozlowski" , Conor Dooley , Dan Williams , "Ilkka Koskinen" , Jonathan Cameron , Dave Jiang CC: Ji Sheng Teoh , Ley Foon Tan , , , , Subject: [PATCH v5 3/3] docs: perf: Add description for StarFive's StarLink PMU Date: Thu, 7 Dec 2023 22:29:40 +0800 Message-ID: <20231207142940.1794032-4-jisheng.teoh@starfivetech.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231207142940.1794032-1-jisheng.teoh@starfivetech.com> References: <20231207142940.1794032-1-jisheng.teoh@starfivetech.com> MIME-Version: 1.0 X-Originating-IP: [202.188.176.82] X-ClientProxiedBy: EXCAS066.cuchost.com (172.16.6.26) To EXMBX072.cuchost.com (172.16.6.82) X-YovoleRuleAgent: yovoleflag Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" StarFive StarLink PMU support monitoring L3 memory system PMU events. Add documentation to describe StarFive StarLink PMU support and it's usage. Signed-off-by: Ji Sheng Teoh --- Documentation/admin-guide/perf/index.rst | 1 + .../perf/starfive_starlink_pmu.rst | 46 +++++++++++++++++++ 2 files changed, 47 insertions(+) create mode 100644 Documentation/admin-guide/perf/starfive_starlink_pmu.rst diff --git a/Documentation/admin-guide/perf/index.rst b/Documentation/admin= -guide/perf/index.rst index a2e6f2c81146..c5de7579a71b 100644 --- a/Documentation/admin-guide/perf/index.rst +++ b/Documentation/admin-guide/perf/index.rst @@ -13,6 +13,7 @@ Performance monitor support imx-ddr qcom_l2_pmu qcom_l3_pmu + starfive_starlink_pmu arm-ccn arm-cmn xgene-pmu diff --git a/Documentation/admin-guide/perf/starfive_starlink_pmu.rst b/Doc= umentation/admin-guide/perf/starfive_starlink_pmu.rst new file mode 100644 index 000000000000..2932ddb4eb76 --- /dev/null +++ b/Documentation/admin-guide/perf/starfive_starlink_pmu.rst @@ -0,0 +1,46 @@ +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D +StarFive StarLink Performance Monitor Unit (PMU) +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +StarFive StarLink Performance Monitor Unit (PMU) exists within the +StarLink Coherent Network on Chip (CNoC) that connects multiple CPU +clusters with an L3 memory system. + +The uncore PMU supports overflow interrupt, up to 16 programmable 64bit +event counters, and an independent 64bit cycle counter. +The PMU can only be accessed via Memory Mapped I/O and are common to the +cores connected to the same PMU. + +Driver exposes supported PMU events in sysfs "events" directory under:: + + /sys/bus/event_source/devices/starfive_starlink_pmu/events/ + +Driver exposes cpu used to handle PMU events in sysfs "cpumask" directory +under:: + + /sys/bus/event_source/devices/starfive_starlink_pmu/cpumask/ + +Driver describes the format of config (event ID) in sysfs "format" directo= ry +under:: + + /sys/bus/event_source/devices/starfive_starlink_pmu/format/ + +Example of perf usage:: + + $ perf list + + starfive_starlink_pmu/cycles/ [Kernel PMU event] + starfive_starlink_pmu/read_hit/ [Kernel PMU event] + starfive_starlink_pmu/read_miss/ [Kernel PMU event] + starfive_starlink_pmu/read_request/ [Kernel PMU event] + starfive_starlink_pmu/release_request/ [Kernel PMU event] + starfive_starlink_pmu/write_hit/ [Kernel PMU event] + starfive_starlink_pmu/write_miss/ [Kernel PMU event] + starfive_starlink_pmu/write_request/ [Kernel PMU event] + starfive_starlink_pmu/writeback/ [Kernel PMU event] + + + $ perf stat -a -e /starfive_starlink_pmu/cycles/ sleep 1 + +Sampling is not supported. As a result, "perf record" is not supported. +Attaching to a task is not supported, only system-wide counting is support= ed. --=20 2.25.1