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authorMathieu Poirier <mathieu.poirier@linaro.org>2017-08-02 19:21:55 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-08-28 17:05:47 +0300
commitcfd9f6306f105977bbe8ff793c4a4bc7a912f040 (patch)
tree5de7a3c168b1705efd276ad1d1debdfccf980ee0 /drivers/hwtracing
parent2fb4f2581d3ab3513fe44d35f9b9e79d89b1f521 (diff)
downloadlinux-cfd9f6306f105977bbe8ff793c4a4bc7a912f040.tar.xz
coresight: Correct buffer lost increment
Many conditions may cause synchronisation to be lost when updating the perf ring buffer but the end result is still the same: synchronisation is lost. As such there is no need to increment the lost count for each condition, just once will suffice. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/coresight/coresight-etb10.c10
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc-etf.c8
2 files changed, 13 insertions, 5 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index d5b96423e1a5..d9c233135d6d 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -353,6 +353,7 @@ static void etb_update_buffer(struct coresight_device *csdev,
struct perf_output_handle *handle,
void *sink_config)
{
+ bool lost = false;
int i, cur;
u8 *buf_ptr;
u32 read_ptr, write_ptr, capacity;
@@ -384,7 +385,7 @@ static void etb_update_buffer(struct coresight_device *csdev,
(unsigned long)write_ptr);
write_ptr &= ~(ETB_FRAME_SIZE_WORDS - 1);
- perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED);
+ lost = true;
}
/*
@@ -395,7 +396,7 @@ static void etb_update_buffer(struct coresight_device *csdev,
*/
status = readl_relaxed(drvdata->base + ETB_STATUS_REG);
if (status & ETB_STATUS_RAM_FULL) {
- perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED);
+ lost = true;
to_read = capacity;
read_ptr = write_ptr;
} else {
@@ -428,9 +429,12 @@ static void etb_update_buffer(struct coresight_device *csdev,
if (read_ptr > (drvdata->buffer_depth - 1))
read_ptr -= drvdata->buffer_depth;
/* let the decoder know we've skipped ahead */
- perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED);
+ lost = true;
}
+ if (lost)
+ perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED);
+
/* finally tell HW where we want to start reading from */
writel_relaxed(read_ptr, drvdata->base + ETB_RAM_READ_POINTER);
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index e3b9fb82eb8d..2e0fb5b9372c 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -369,6 +369,7 @@ static void tmc_update_etf_buffer(struct coresight_device *csdev,
struct perf_output_handle *handle,
void *sink_config)
{
+ bool lost = false;
int i, cur;
u32 *buf_ptr;
u32 read_ptr, write_ptr;
@@ -397,7 +398,7 @@ static void tmc_update_etf_buffer(struct coresight_device *csdev,
*/
status = readl_relaxed(drvdata->base + TMC_STS);
if (status & TMC_STS_FULL) {
- perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED);
+ lost = true;
to_read = drvdata->size;
} else {
to_read = CIRC_CNT(write_ptr, read_ptr, drvdata->size);
@@ -442,9 +443,12 @@ static void tmc_update_etf_buffer(struct coresight_device *csdev,
read_ptr -= drvdata->size;
/* Tell the HW */
writel_relaxed(read_ptr, drvdata->base + TMC_RRP);
- perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED);
+ lost = true;
}
+ if (lost)
+ perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED);
+
cur = buf->cur;
offset = buf->offset;