[PATCH 03/11] coresight: tmc-etr: Do not clean trace buffer
From: suzuki.poulose@arm.com (Suzuki K Poulose)
Date: 2018-05-18 16:39:43
Also in:
lkml
Subsystem:
arm/coresight framework and drivers, hardware tracing facilities, the rest · Maintainers:
Suzuki K Poulose, Alexander Shishkin, Linus Torvalds
We zero out the entire trace buffer used for ETR before it is enabled, for helping with debugging. With the addition of scatter-gather mode, the buffer could be bigger and non-contiguous. Get rid of this step; if someone wants to debug, they can always add it as and when needed. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index d3c2b04..c73bcb3 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c@@ -24,9 +24,6 @@ static void tmc_etr_enable_hw(struct tmc_drvdata *drvdata) { u32 axictl, sts; - /* Zero out the memory to help with debug */ - memset(drvdata->vaddr, 0, drvdata->size); - CS_UNLOCK(drvdata->base); /* Wait for TMCSReady bit to be set */
@@ -352,9 +349,8 @@ int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata) if (drvdata->mode == CS_MODE_SYSFS) { /* * The trace run will continue with the same allocated trace - * buffer. The trace buffer is cleared in tmc_etr_enable_hw(), - * so we don't have to explicitly clear it. Also, since the - * tracer is still enabled drvdata::buf can't be NULL. + * buffer. Since the tracer is still enabled drvdata::buf can't + * be NULL. */ tmc_etr_enable_hw(drvdata); } else {
--
2.7.4