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authorMathieu Poirier <mathieu.poirier@linaro.org>2016-05-03 11:33:55 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-05-03 14:59:30 -0700
commita40318fb01e98e72175bd9891208541148633d42 (patch)
tree905da38f3b55b953860c374b993e6905e9654924 /drivers/hwtracing
parentf2facc3366d77e78dbc8bf865f1e4a6227a7f0e5 (diff)
downloadlinux-a40318fb01e98e72175bd9891208541148633d42.tar.bz2
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')
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc-etf.c7
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc-etr.c7
2 files changed, 12 insertions, 2 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index bc0efc1e5b49..b5e5e6ac67eb 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -74,7 +74,12 @@ static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
CS_UNLOCK(drvdata->base);
tmc_flush_and_stop(drvdata);
- tmc_etb_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_etb_dump_hw(drvdata);
tmc_disable_hw(drvdata);
CS_LOCK(drvdata->base);
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);