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UPSTREAM: coresight: trbe: Make sure we have enough space

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The TRBE driver makes sure that there is enough space for a meaningful
run, otherwise pads the given space and restarts the offset calculation
once. But there is no guarantee that we may find space or hit "no space".
Make sure that we repeat the step until, either :
  - We have the minimum space
   OR
  - There is NO space at all.

Bug: 213931796
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20211019163153.3692640-13-suzuki.poulose@arm.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
(cherry picked from commit adf35d0586)
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Change-Id: I6d18039e90aaba17fc0071806795288a02318144
This commit is contained in:
Suzuki K Poulose
2021-10-19 17:31:50 +01:00
committed by Todd Kjos
parent 6f1a11858f
commit e7fc4a9e62
1 changed files with 5 additions and 1 deletions
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6
drivers/hwtracing/coresight/coresight-trbe.c
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@@ -477,10 +477,14 @@ static unsigned long trbe_normal_offset(struct perf_output_handle *handle)
* If the head is too close to the limit and we don't
* have space for a meaningful run, we rather pad it
* and start fresh.
*
* We might have to do this more than once to make sure
* we have enough required space.
*/
if (limit && ((limit - head) < trbe_min_trace_buf_size(handle))) {
while (limit && ((limit - head) < trbe_min_trace_buf_size(handle))) {
trbe_pad_buf(handle, limit - head);
limit = __trbe_normal_offset(handle);
head = PERF_IDX2OFF(handle->head, buf);
}
return limit;
}