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 DEBD53C342D for ; Fri, 2 Oct 2026 19:03:37 +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=1790967820; cv=none; b=fLkVEdNwu+XQL38wis3hG2kOvkdqRL6FRSNWds1PXuDr7zD4gvbFAHhrgtDdD0ZxU11EbLJlNk8AQQGlCyky295KuxDfjTysYIkjj4l6IECbeor3/9iIB8Dq0MEPdla5Y3E2mYWnKDFPxD2YgMbJ5pBGg6wfMfheHzuvNXHl6Lg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790967820; c=relaxed/simple; bh=TbnVt3gQWmpcMUUHHajzpHckoRHYF737sR5u33zz6ek=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=KF41Y3fYTALElVuT2uae3VefKqMsAGkU0uctQlP2+ol9LWxugAdzm1dkxYv9jEcyLyLAO1MhUZ/HfxXCfzXo3XHL/Mimk9UxgdkbZHEM29w4ulIiDjBbONxXe6LxQXyO4tpYQFk5vcU193pYvBopDueAAyrqtmk04fk8/mEfhPE= 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=jWixvWMS; 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="jWixvWMS" 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 D64142F; Fri, 2 Oct 2026 12:03:33 -0700 (PDT) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 400513F85F; Fri, 2 Oct 2026 12:03:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1790967817; bh=TbnVt3gQWmpcMUUHHajzpHckoRHYF737sR5u33zz6ek=; h=From:Subject:Date:To:Cc:From; b=jWixvWMSQPprN4sDVPjylBBh9xxN+fGM4CMWg+dngp8op8RPklL+hjpGHySgOFIZR NQYhoAM6dgDnNfPeMAMKzNwzT91riT+Sjln7YBHwCLi6tfjhEXjStm4YLx58H2fHEz MxK9NdKLMw69ej719T258THTalBSVG8P4maHrb3M= From: Yeoreum Yun Subject: [PATCH v13 00/14] fix several inconsistencies with sysfs configuration in etmX Date: Fri, 02 Oct 2026 20:03:21 +0100 Message-Id: <20261002-separate_etm_cfg_v2-v13-0-fe429d8d96fb@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAPn/v2oC/33NywqDMBAF0F+RrJvijMZoV/2PUiRPzcIHiUiL+ O+NbioFu7yXuWcWEox3JpBbshBvZhfc0McA2SUhqhV9Y6jTsSCYYpFWADSYUXgxmdpMXa1sU89 IMwalgKJU0loSl6M31r129vGMuXVhGvx7/zJDutX/wXhEUwqSA9MVq5CLu/DdVQ0d2bwZ4GiwE wOioVEiKzUDnvMfAw8G5icGRkOgzEGj5Qrl11jX9QM+ylotPwEAAA== To: Mike Leach , James Clark , Leo Yan , Greg Kroah-Hartman , Mathieu Poirier , coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev Cc: Suzuki K Poulose , Alexander Shishkin , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , Yeoreum Yun X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=5779; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=TbnVt3gQWmpcMUUHHajzpHckoRHYF737sR5u33zz6ek=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqv///eNenjJHKMCxTJOH7tptKpRUK4ca1T6/DG bxCtbP/rNuJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCar///wAKCRBt1cPRWsUx M1MNDACKezudDcFRYbvFgi6Eur4LQmQY7SHC1Dxl44XhkeY0RQ32j2VUFP7JCAZLyMgMLVQ/uFf jqvZAoD1osyZGwga9NPkoGMbzgMnYhu4dAKNHpSSOZtePCwQMhS6YgAKxxsG5Koqlq+LeLT25PN q7RwdZnlM1Z9hXaHf8qJpBY64N65w3SUTqkYRvYdSOMC+oA10/sAN+xGDXDTbapC4lRqNclazdh K/zI8Ft8IkTABtaLEjApfhUxvU+AMUunL9qqa+ZkqUFiioFM0rp+bpDLzysTehSVdt0qBQphBSD 6qhinJPNtoqIw7RFS35jQXQPEVvTRtK9Ld+FXh3RZ4kpkY/RKv/TsTWo/G2sUcxfA6RvPfIxNlp pALWTINtbD3MyyGWycksG55Qa7r0Shq/z53kqLoUbUwI8s2yLU54XWGMnlOuePT2ONr0HgWMjDP mPvggbGMrZd9vq6FQTosiUdEdCdb3DrxzMI1pIN6vbF5pSB1+/3iRWhgpLJ9LMj2hui/Q= X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 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: - curr_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. Patch History ============= from v12 to v13: - add r-b tags - Link to v12: https://lore.kernel.org/r/20260924-separate_etm_cfg_v2-v12-0-a2b41d2f7c2b@arm.com from v11 to v12: - rename active_config to curr_config. - rename config to sysfs_config. - remove redundant config argument in etmX_args. - add read-back and copy from curr_config to sysfs_config TRCSEQSTR (seq_state). - add r-b and t-b tags. - Link to v11: https://lore.kernel.org/r/20260915-separate_etm_cfg_v2-v11-0-d2b258d51747@arm.com from v10 to v11: - replace direct register read from etm3 sysfs with IPI. - fix issue cntr_val and others field which required to be shown after sysfs session disable. - prohibit the write for some etm3 sysfs while sysfs session is enabled. - drop locktype change in etm3 - Link to v10: https://lore.kernel.org/r/20260911-separate_etm_cfg_v2-v10-0-1b715d95927a@arm.com from v9 to v10: - rebase to coresight/next - https://lore.kernel.org/all/20260725113645.57519-1-yeoreum.yun@arm.com/ from v8 to v9: - add feat_csdev_lock guard interface. - set feat_csdev->drv_spinlock as NULL for etmv4_drvdata. - https://lore.kernel.org/all/20260629090007.1718746-1-yeoreum.yun@arm.com/ from v7 to v8: - accept @Leo Yan' suggestion to handle error. - small minor fixes following @Suzuki' suggestion. - https://lore.kernel.org/all/20260519154812.254884-1-yeoreum.yun@arm.com/ from v6 to v7: - rebase on coresight/next - add ETM_MAX_SEQ_TRANSITIONS define - remove redundant patch relavent cpu-hotplug as coresight-pm patch merged. - https://lore.kernel.org/all/20260422132203.977549-1-yeoreum.yun@arm.com/ 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 (14): coresight: etm4x: read-back TRCSEQSTR at disabling and prohibit modifying seq_state while enabling. coresight: etm4x: prohibit modifying cntr_val while session is enabled coresight: etm3x: prohibit modifying cntr_val and reset while session is enabled coresight: etm4x: fix inconsistencies with sysfs configuration coresight: etm3x: fix inconsistencies with sysfs configuration coresight: etm3x: remove redundant cpu online check on etm_enable_sysfs() coresight: etm4x: introduce struct etm4_caps coresight: etm4x: exclude ss_status from drvdata->config coresight: etm4x: remove s_ex_level from config coresight: etm4x: rename local config as curr_config referring drvdata->curr_config coresight: etm4x: rename drvdata->config to sysfs_config coresight: etm3x: introduce struct etm_caps coresight: etm3x: rename local config as curr_config referring drvdata->curr_config coresight: etm3x: rename drvdata->config to sysfs_config drivers/hwtracing/coresight/coresight-config.c | 18 +- drivers/hwtracing/coresight/coresight-config.h | 22 + drivers/hwtracing/coresight/coresight-etm.h | 48 +- drivers/hwtracing/coresight/coresight-etm3x-core.c | 196 +++-- .../hwtracing/coresight/coresight-etm3x-sysfs.c | 461 +++++----- drivers/hwtracing/coresight/coresight-etm4x-cfg.c | 14 +- drivers/hwtracing/coresight/coresight-etm4x-core.c | 567 ++++++------ .../hwtracing/coresight/coresight-etm4x-sysfs.c | 961 +++++++++++---------- drivers/hwtracing/coresight/coresight-etm4x.h | 199 +++-- 9 files changed, 1340 insertions(+), 1146 deletions(-) --- base-commit: a3281934612608db9e1d24aaf913c846e913de89 change-id: 20260911-separate_etm_cfg_v2-3518a168cbff Best regards, -- Sincerely, Yeoreum Yun