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| author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2021-10-19 18:31:49 +0200 |
|---|---|---|
| committer | Mathieu Poirier <mathieu.poirier@linaro.org> | 2021-10-27 19:45:57 +0200 |
| commit | 7c2cc5e26cc0c6bc2478ac203e3fe71950418ea0 (patch) | |
| tree | 682b29801953294e7101ad7582a4f2d7eaec043a /drivers/hwtracing | |
| parent | coresight: trbe: Workaround TRBE errata overwrite in FILL mode (diff) | |
| download | linux-7c2cc5e26cc0c6bc2478ac203e3fe71950418ea0.tar.xz linux-7c2cc5e26cc0c6bc2478ac203e3fe71950418ea0.zip | |
coresight: trbe: Add a helper to determine the minimum buffer size
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>
Diffstat (limited to 'drivers/hwtracing')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-trbe.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c index 2d39e5ecb72c..02a639ece2af 100644 --- a/drivers/hwtracing/coresight/coresight-trbe.c +++ b/drivers/hwtracing/coresight/coresight-trbe.c @@ -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); } |