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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>
This commit is contained in:
Mathieu Poirier 2016-05-03 11:33:55 -06:00 committed by Greg Kroah-Hartman
parent f2facc3366
commit a40318fb01
2 changed files with 12 additions and 2 deletions
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7
drivers/hwtracing/coresight/coresight-tmc-etf.c
View File

@ -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);

7
drivers/hwtracing/coresight/coresight-tmc-etr.c
View File

@ -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);