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charset=us-ascii Content-Disposition: inline In-Reply-To: <6ec5e456-fdf9-4953-9a0f-6231b48df07a@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260716_122438_938174_72CDDFD0 X-CRM114-Status: GOOD ( 29.64 ) 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 On Thu, Jul 16, 2026 at 01:48:15PM +0100, Suzuki K Poulose wrote: > On 29/06/2026 09:59, Yeoreum Yun wrote: > > 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 coresight tree's next > > > Please could you move all the "Fixes" to the top of the series, that way > it is cleaner to backport for the stable kernels Okay. but the fix which based on the cleanup wouldn't be top of it. I'll deploy below patches first: coresight: etm3x: change drvdata->spinlock type to raw_spin_lock_t coresight: etm4x: fix leaked trace id coresight: etm4x: fix underflow for usage of (nrseqstate - 1) coresight: etm4x: fix wrong check of etm4x_sspcicrn_present() > > I have some minor comments, please could you address them. Otherwise, > looks good to me. Thanks for the cleanup Thanks for your review! > > > > > > Patch History > > ============= > > 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 (13): > > coresight: etm4x: fix wrong check of etm4x_sspcicrn_present() > > coresight: etm4x: fix underflow for usage of (nrseqstate - 1) > > coresight: etm4x: introduce struct etm4_caps > > coresight: etm4x: exclude ss_status from drvdata->config > > coresight: etm4x: remove s_ex_level from 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: 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 cpu online check on > > etm_enable_sysfs() > > > > drivers/hwtracing/coresight/coresight-etm.h | 46 +- > > .../coresight/coresight-etm3x-core.c | 96 ++-- > > .../coresight/coresight-etm3x-sysfs.c | 159 +++--- > > .../hwtracing/coresight/coresight-etm4x-cfg.c | 5 +- > > .../coresight/coresight-etm4x-core.c | 454 ++++++++++-------- > > .../coresight/coresight-etm4x-sysfs.c | 204 ++++---- > > drivers/hwtracing/coresight/coresight-etm4x.h | 202 ++++---- > > 7 files changed, 639 insertions(+), 527 deletions(-) > > > -- Sincerely, Yeoreum Yun