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 684E5330B14 for ; Wed, 22 Apr 2026 13:22:08 +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=1776864129; cv=none; b=BrcwtRzo3FVvJR+rML3G4D2JvuDPwLPeqKdGgToeD1rXBbUWBffKxHA6N9PJDWi5xP/+6I2kJy94jtIAdggELxVbux0KdxMjIUJzeZ07KnhYXQyhyw+teYMUPJJyihaVpH2F/J4i6ZSl9O3RGD4Y0g4XcVy4fxfB5HZZu/JLLv0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776864129; c=relaxed/simple; bh=1Dl9mLxUt7hW/4BYBJxfcg/K5lhhqXp4yvX5HtjxTxE=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=oGaGtEaaitYvP1MG6q5eaPFjFIY1mq8lq+zdOqzHnEJ4+vxDO0l9s5v1udCERFXLfxVemLw+g0gGXiFNUNWohihShDOBdD9XBuJLImwU6lYr/b9bI8lyFqUJksB0xyFDowz9vuwlBiEi2mfHd98qafyk45vGgwRnSJeSCMw5pUM= 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=dkVSCzda; 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="dkVSCzda" 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 31DA21E2F; Wed, 22 Apr 2026 06:22:02 -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 E57663FD46; Wed, 22 Apr 2026 06:22:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1776864127; bh=1Dl9mLxUt7hW/4BYBJxfcg/K5lhhqXp4yvX5HtjxTxE=; h=From:To:Cc:Subject:Date:From; b=dkVSCzdaH95uaHkhAzUYSKa8IoerGaZKzMqkDgt36xJGNkYnAop/DliHlgNDYkJZZ XJ4zuzx4SH+G/rnS+8EbxYnIhg+Scqu/H+sSXfiKG3Sk1XiVKq4QmcNDW1lVxQgSCD x97wROp1YubRhoUVEYxJfnf/YTzAf6ttPmaYI7I8= 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, jie.gan@oss.qualcomm.com, Yeoreum Yun Subject: [PATCH v6 00/13] fix several inconsistencies with sysfs configuration in etmX Date: Wed, 22 Apr 2026 14:21:50 +0100 Message-Id: <20260422132203.977549-1-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. Also, This patch set includes some small fixes: - missing trace id release in etm4x. - underflow issue for nrseqstate. - wrong check in etm4x_sspcicrn_present(). - missing call of cscfg_csdev_disable_active_config() This patch based on v7.0 Patch History ============= from v5 to v6: - fix missing of calling cscfg_csdev_disable_active_config() - add rb & fixes tags. - add ss_status field in etm4x_drvdata to expose STATUS and PENDING bits. - https://lore.kernel.org/all/20260415165528.3369607-1-yeoreum.yun@arm.com/ from v4 to v5: - add rb-tag. - fix underflow issue for nrseqstate. - fix wrong check in etm4_sspcicrn_present(). - remove redundant fields on etmv4_save_state. - rename caps->ss_status to ss_cmp. - fix wrong location of etm4_release_trace_id. - https://lore.kernel.org/all/20260413142003.3549310-1-yeoreum.yun@arm.com/ from v3 to v4: - change etm_drvdata->spinlock type to raw_spin_lock_t - remove redundant call etmX_enable_hw() with starting_cpu() callsback. - fix missing trace id release. - add missing docs. - https://lore.kernel.org/all/20260412175506.412301-1-yeoreum.yun@arm.com/ from v2 to v3: - fix build error for etm3x. - fix checkpatch warning. - https://lore.kernel.org/all/20260410074310.2693385-1-yeoreum.yun@arm.com/ 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 (13): coresight: etm4x: fix wrong check of etm4x_sspcicrn_present() coresight: etm4x: fix underflow for nrseqstate coresight: etm4x: introduce struct etm4_caps coresight: etm4x: exclude ss_status from drvdata->config coresight: etm4x: remove redundant fields in etmv4_save_state coresight: etm4x: fix leaked trace id coresight: etm4x: fix inconsistencies with sysfs configuration coresight: etm4x: remove redundant call etm4_enable_hw() with hotplug coresight: etm4x: missing cscfg_csdev_disable_active_config() in perf enable coresight: etm3x: change drvdata->spinlock type to raw_spin_lock_t coresight: etm3x: introduce struct etm_caps coresight: etm3x: fix inconsistencies with sysfs configuration coresight: etm3x: remove redundant call etm_enable_hw() with hotplug drivers/hwtracing/coresight/coresight-etm.h | 46 ++- .../coresight/coresight-etm3x-core.c | 101 ++--- .../coresight/coresight-etm3x-sysfs.c | 159 +++---- .../hwtracing/coresight/coresight-etm4x-cfg.c | 3 +- .../coresight/coresight-etm4x-core.c | 388 ++++++++++-------- .../coresight/coresight-etm4x-sysfs.c | 202 +++++---- drivers/hwtracing/coresight/coresight-etm4x.h | 190 +++++---- 7 files changed, 606 insertions(+), 483 deletions(-) base-commit: 028ef9c96e96197026887c0f092424679298aae8 -- LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}