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coresight: trbe: Add a helper to determine the minimum buffer size

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For the TRBE to operate, we need a minimum space available to collect
meaningful trace session. This is currently a few bytes, but we may need
to extend this for working around errata. So, abstract this into a helper
function.

Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Mathieu Poirier <mathieu.poirier@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/20211019163153.3692640-12-suzuki.poulose@arm.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
This commit is contained in:
Suzuki K Poulose 2021-10-19 17:31:49 +01:00 committed by Mathieu Poirier
parent 5cb75f1880
commit 7c2cc5e26c
1 changed files with 6 additions and 1 deletions
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7
drivers/hwtracing/coresight/coresight-trbe.c
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@ -303,6 +303,11 @@ static unsigned long trbe_snapshot_offset(struct perf_output_handle *handle)
return buf->nr_pages * PAGE_SIZE;
}
static u64 trbe_min_trace_buf_size(struct perf_output_handle *handle)
{
return TRBE_TRACE_MIN_BUF_SIZE;
}
/*
* TRBE Limit Calculation
*
@ -473,7 +478,7 @@ static unsigned long trbe_normal_offset(struct perf_output_handle *handle)
* have space for a meaningful run, we rather pad it
* and start fresh.
*/
if (limit && (limit - head < TRBE_TRACE_MIN_BUF_SIZE)) {
if (limit && ((limit - head) < trbe_min_trace_buf_size(handle))) {
trbe_pad_buf(handle, limit - head);
limit = __trbe_normal_offset(handle);
}