[PATCH V3 12/18] coresight: tmc: dump system memory content only when needed

[Mathieu Poirier]

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.poir...@linaro.org>
---
 drivers/hwtracing/coresight/coresight-tmc-etf.c | 7 ++++++-
 drivers/hwtracing/coresight/coresight-tmc-etr.c | 7 ++++++-
 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 d090a9745c73..25fad93b68d4 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 8bbbf3ab1387..4b000f4003a2 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);
-- 
2.5.0