From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 46D8E1C862D for ; Fri, 10 Apr 2026 07:43:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775807002; cv=none; b=syujfUZ9lN+wY0J0hwy/yzFfU5nF0CQoN+725GMWN/ySmKlwZVlELVDyzNDFgK4lb3l9keLssesyD+xHgpT/B4hH7HpJOExiLmhTURLg/EAP9h861M6/DLhdsyKbnYkX3UcTOHuF5/61eNPei0crDslIzaoqz8ptLd8AjRbwVJM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775807002; c=relaxed/simple; bh=PQO7zOkrnH5khIgNVMnJx0EZ1WFsZepjGJasGOXUV/w=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=jeikMBrdTHWBYYgRTxuH/+bMz8eXPmz+/TIsF8VkHiw4/jO0TICUByjvzcJZZLCqaVDTXKt5AOH4SPRExtFKFKjE5puWrk5dd4asjEqvzuAX+iHiObva93Clz44873Omr+Df1RLqbj8dxiIlMCaGpFq7KqYhMxO0Qs8kfNkzCac= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=AJ3QDhm0; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="AJ3QDhm0" 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 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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}