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 33924E9904F for ; Fri, 10 Apr 2026 07:43:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=kUPJYD2mvk9MkO6ZjBKjxBKPbi8Nb+tFhqEtJZHM5Fo=; b=xFqBATih489AsaKKhOJvK0bwLv 18HMF8/0ZRz69yA7lKXA9aRnrBC0c+CBv3G4OeW8dyn7IrE4VHdFq/chZTphCd0TrH6eWYv4ZBFC/ w2ClqltEZ5gGXf2YfMkI3/+fB5CB0WxtnNaJ1vNjSalNKlyQ5HXPuYNPqhz5oHs8vgUMYk/zAJWNK JUXtM3xZfkhDAq1+dGSXBtSekiFxE8Og+wT4HMufFFT+/Ti+LScCQGCnJsFrefVKMxH8TVeon9lzi pgmwVTOESPJwHIZHydZwemALsBj+fUQsRgWPf4xoOcUWI9dgEY+TcD4eaij1KV8BcrC7suHwFDhKg mKLG2CKA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wB6WS-0000000BmJO-28UM; Fri, 10 Apr 2026 07:43:24 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wB6WQ-0000000BmI3-1W0k for linux-arm-kernel@lists.infradead.org; Fri, 10 Apr 2026 07:43:23 +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 91F711CE2; Fri, 10 Apr 2026 00:43:13 -0700 (PDT) Received: from e129823.cambridge.arm.com (e129823.arm.com [10.1.197.6]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id E07913FAF5; Fri, 10 Apr 2026 00:43:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1775806999; bh=PQO7zOkrnH5khIgNVMnJx0EZ1WFsZepjGJasGOXUV/w=; h=From:To:Cc:Subject:Date:From; b=AJ3QDhm0mLy8uMayoCsBnCbXUUa4a+RT6NEGvtzVCiSPO6TzTwBopsEtLPot3eKsy wt2xm1HzL7ln62R460LD8I8Mo5dToQCczpYJlx1Ck3+xeTVQ8mcV7jVJhTihgJDl5Z kMhzHFhfSbGcOgSHeN2ksvgRha+Ly9TkJzzveX4w= From: Yeoreum Yun To: coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: suzuki.poulose@arm.com, mike.leach@arm.com, james.clark@linaro.org, alexander.shishkin@linux.intel.com, leo.yan@arm.com, Yeoreum Yun Subject: [PATCH v2 0/5] fix inconsistencies with sysfs configuration in etmX Date: Fri, 10 Apr 2026 08:43:05 +0100 Message-Id: <20260410074310.2693385-1-yeoreum.yun@arm.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260410_004322_434020_1D7C77B2 X-CRM114-Status: UNSURE ( 8.75 ) X-CRM114-Notice: Please train this message. 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The current ETMx configuration via sysfs can lead to the following inconsistencies: - If a configuration is modified via sysfs while a perf session is active, the running configuration may differ between before a sched-out and after a subsequent sched-in. - If a perf session and sysfs session tries to enable concurrently, configuration from configfs could be corrupted (etm4). - There is chance to corrupt drvdata->config if perf session tries to enabled among handling cscfg_csdev_disable_active_config() in etm4_disable_sysfs() (etm4). To resolve these inconsistencies, the configuration should be separated into: - active_config, which is applied configuration for the current session - config, which stores the settings configured via sysfs. and apply configuration from configfs after taking a mode. This patch based on v7.0-rc7 Patch History ============= from v1 to v2 - rebased to v7.0-rc7. - introduce etmX_caps structure to save etmX's capabilities. - remove ss_status from etmv4_config. - modify active_config after taking a mode (perf/sysfs). - https://lore.kernel.org/all/20260317181705.2456271-1-yeoreum.yun@arm.com/ Yeoreum Yun (5): coresight: etm4x: introduce struct etm4_caps coresight: etm4x: exclude ss_status from drvdata->config coresight: etm4x: fix inconsistencies with sysfs configration coresight: etm3x: introduce struct etm_caps coresight: etm3x: fix inconsistencies with sysfs configration drivers/hwtracing/coresight/coresight-etm.h | 42 ++- .../coresight/coresight-etm3x-core.c | 53 +-- .../coresight/coresight-etm3x-sysfs.c | 14 +- .../hwtracing/coresight/coresight-etm4x-cfg.c | 3 +- .../coresight/coresight-etm4x-core.c | 322 ++++++++++-------- .../coresight/coresight-etm4x-sysfs.c | 192 ++++++----- drivers/hwtracing/coresight/coresight-etm4x.h | 180 +++++----- 7 files changed, 450 insertions(+), 356 deletions(-) base-commit: 591cd656a1bf5ea94a222af5ef2ee76df029c1d2 -- LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}