From: Suzuki K Poulose <suzuki.poulose@arm.com> To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, mathieu.poirier@linaro.org, mike.leach@linaro.org, robert.walker@arm.com, coresight@lists.linaro.org, Suzuki K Poulose <suzuki.poulose@arm.com> Subject: [PATCH v3 08/13] coresight: tmc-etr: Relax collection of trace from sysfs mode Date: Thu, 26 Jul 2018 13:54:46 +0100 [thread overview] Message-ID: <1532609691-16863-9-git-send-email-suzuki.poulose@arm.com> (raw) In-Reply-To: <1532609691-16863-1-git-send-email-suzuki.poulose@arm.com> Since the ETR now uses mode specific buffers, we can reliably provide the trace data captured in sysfs mode, even when the ETR is operating in PERF mode. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 58c7935..671a2ba 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -1168,19 +1168,17 @@ int tmc_read_prepare_etr(struct tmc_drvdata *drvdata) goto out; } - /* Don't interfere if operated from Perf */ - if (drvdata->mode == CS_MODE_PERF) { - ret = -EINVAL; - goto out; - } - - /* If sysfs_buf is NULL the trace data has been read already */ + /* + * We can safely allow reads even if the ETR is operating in PERF mode, + * since the sysfs session is captured in mode specific data. + * If drvdata::sysfs_data is NULL the trace data has been read already. + */ if (!drvdata->sysfs_buf) { ret = -EINVAL; goto out; } - /* Disable the TMC if we are trying to read from a running session */ + /* Disable the TMC if we are trying to read from a running session. */ if (drvdata->mode == CS_MODE_SYSFS) tmc_etr_disable_hw(drvdata); -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: suzuki.poulose@arm.com (Suzuki K Poulose) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 08/13] coresight: tmc-etr: Relax collection of trace from sysfs mode Date: Thu, 26 Jul 2018 13:54:46 +0100 [thread overview] Message-ID: <1532609691-16863-9-git-send-email-suzuki.poulose@arm.com> (raw) In-Reply-To: <1532609691-16863-1-git-send-email-suzuki.poulose@arm.com> Since the ETR now uses mode specific buffers, we can reliably provide the trace data captured in sysfs mode, even when the ETR is operating in PERF mode. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 58c7935..671a2ba 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -1168,19 +1168,17 @@ int tmc_read_prepare_etr(struct tmc_drvdata *drvdata) goto out; } - /* Don't interfere if operated from Perf */ - if (drvdata->mode == CS_MODE_PERF) { - ret = -EINVAL; - goto out; - } - - /* If sysfs_buf is NULL the trace data has been read already */ + /* + * We can safely allow reads even if the ETR is operating in PERF mode, + * since the sysfs session is captured in mode specific data. + * If drvdata::sysfs_data is NULL the trace data has been read already. + */ if (!drvdata->sysfs_buf) { ret = -EINVAL; goto out; } - /* Disable the TMC if we are trying to read from a running session */ + /* Disable the TMC if we are trying to read from a running session. */ if (drvdata->mode == CS_MODE_SYSFS) tmc_etr_disable_hw(drvdata); -- 2.7.4
next prev parent reply other threads:[~2018-07-26 12:55 UTC|newest] Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-07-26 12:54 [PATCH v3 00/13] coresight: perf: Support for TMC ETR backend Suzuki K Poulose 2018-07-26 12:54 ` Suzuki K Poulose 2018-07-26 12:54 ` [PATCH v3 01/13] coresight: Fix handling of sinks Suzuki K Poulose 2018-07-26 12:54 ` Suzuki K Poulose 2018-07-26 12:54 ` [PATCH v3 02/13] coresight: etb10: Fix handling of perf mode Suzuki K Poulose 2018-07-26 12:54 ` Suzuki K Poulose 2018-07-31 17:07 ` Mathieu Poirier 2018-07-31 17:07 ` Mathieu Poirier 2018-07-31 21:32 ` Suzuki K Poulose 2018-07-31 21:32 ` Suzuki K Poulose 2018-08-01 19:23 ` Mathieu Poirier 2018-08-01 19:23 ` Mathieu Poirier 2018-07-26 12:54 ` [PATCH v3 03/13] coresight: perf: Fix per cpu path management Suzuki K Poulose 2018-07-26 12:54 ` Suzuki K Poulose 2018-07-26 12:54 ` [PATCH v3 04/13] coresight: perf: Avoid unncessary CPU hotplug read lock Suzuki K Poulose 2018-07-26 12:54 ` Suzuki K Poulose 2018-07-26 12:54 ` [PATCH v3 05/13] coresight: perf: Allow tracing on hotplugged CPUs Suzuki K Poulose 2018-07-26 12:54 ` Suzuki K Poulose 2018-07-31 17:46 ` Mathieu Poirier 2018-07-31 17:46 ` Mathieu Poirier 2018-07-31 23:08 ` Suzuki K Poulose 2018-07-31 23:08 ` Suzuki K Poulose 2018-07-26 12:54 ` [PATCH v3 06/13] coresight: perf: Disable trace path upon source error Suzuki K Poulose 2018-07-26 12:54 ` Suzuki K Poulose 2018-07-26 12:54 ` [PATCH v3 07/13] coresight: tmc-etr: Handle driver mode specific ETR buffers Suzuki K Poulose 2018-07-26 12:54 ` Suzuki K Poulose 2018-07-26 12:54 ` Suzuki K Poulose [this message] 2018-07-26 12:54 ` [PATCH v3 08/13] coresight: tmc-etr: Relax collection of trace from sysfs mode Suzuki K Poulose 2018-07-26 12:54 ` [PATCH v3 09/13] coresight: Convert driver messages to dev_dbg Suzuki K Poulose 2018-07-26 12:54 ` Suzuki K Poulose 2018-07-26 12:54 ` [PATCH v3 10/13] coresight: perf: Remove reset_buffer call back for sinks Suzuki K Poulose 2018-07-26 12:54 ` Suzuki K Poulose 2018-07-26 12:54 ` [PATCH v3 11/13] coresight: perf: Add helper to retrieve sink configuration Suzuki K Poulose 2018-07-26 12:54 ` Suzuki K Poulose 2018-07-26 12:54 ` [PATCH v3 12/13] coresight: perf: Remove set_buffer call back Suzuki K Poulose 2018-07-26 12:54 ` Suzuki K Poulose 2018-07-26 12:54 ` [PATCH v3 13/13] coresight: etm-perf: Add support for ETR backend Suzuki K Poulose 2018-07-26 12:54 ` Suzuki K Poulose
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