OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

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>
This commit is contained in:
Mathieu Poirier 2017-08-02 10:21:55 -06:00 committed by Greg Kroah-Hartman
parent 2fb4f2581d
commit cfd9f6306f
2 changed files with 13 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/hwtracing/coresight/coresight-etb10.c
View File

@ -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);

8
drivers/hwtracing/coresight/coresight-tmc-etf.c
View File

@ -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;