diff options
| author | Mathieu Poirier <mathieu.poirier@linaro.org> | 2016-05-03 20:33:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-05-04 00:59:30 +0300 |
| commit | a40318fb01e98e72175bd9891208541148633d42 (patch) | |
| tree | 905da38f3b55b953860c374b993e6905e9654924 /drivers/hwtracing/coresight/coresight-tmc-etr.c | |
| parent | f2facc3366d77e78dbc8bf865f1e4a6227a7f0e5 (diff) | |
| download | linux-a40318fb01e98e72175bd9891208541148633d42.tar.xz | |
coresight: tmc: dump system memory content only when needed
Calling tmc_etf/etr_dump_hw() is required only when operating from
sysFS. When working from Perf, the system memory is harvested
from the AUX trace API.
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-tmc-etr.c')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-tmc-etr.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 0c107811a232..7208584d0da7 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -76,7 +76,12 @@ static void tmc_etr_disable_hw(struct tmc_drvdata *drvdata) CS_UNLOCK(drvdata->base); tmc_flush_and_stop(drvdata); - tmc_etr_dump_hw(drvdata); + /* + * When operating in sysFS mode the content of the buffer needs to be + * read before the TMC is disabled. + */ + if (local_read(&drvdata->mode) == CS_MODE_SYSFS) + tmc_etr_dump_hw(drvdata); tmc_disable_hw(drvdata); CS_LOCK(drvdata->base); |