[PATCH v4 11/15] coresight: trbe: Add a helper to determine the minimum buffer size
From: Suzuki K Poulose <suzuki.poulose@arm.com>
Date: 2021-10-12 13:19:21
Also in:
lkml
Subsystem:
arm/coresight framework and drivers, hardware tracing facilities, the rest · Maintainers:
Suzuki K Poulose, Alexander Shishkin, Linus Torvalds
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 <redacted> Cc: Mike Leach <redacted> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Leo Yan <redacted> Reviewed-by: Anshuman Khandual <redacted> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> --- drivers/hwtracing/coresight/coresight-trbe.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c
index 2a1656902836..c2ab4351e80b 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); }
--
2.25.4
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