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coresight: tmc-etr: Relax collection of trace from sysfs mode

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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>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2018-09-20 13:17:52 -06:00 committed by Greg Kroah-Hartman
parent 96a7f64400
commit cad5f8d399
1 changed files with 6 additions and 8 deletions
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14
drivers/hwtracing/coresight/coresight-tmc-etr.c
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@ -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);