linux-kernel - [PATCH 11/19] coresight: trbe: Apply overwrite erratum for only wrap event

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Message-Id: <20251201-trbe_buffer_refactor_v1-1-v1-11-7da32b076b28@arm.com>
Date: Mon, 01 Dec 2025 11:22:01 +0000
From: Leo Yan <leo.yan@....com>
To: Suzuki K Poulose <suzuki.poulose@....com>, 
 Mike Leach <mike.leach@...aro.org>, James Clark <james.clark@...aro.org>, 
 Anshuman Khandual <anshuman.khandual@....com>, 
 Yeoreum Yun <yeoreum.yun@....com>, Will Deacon <will@...nel.org>, 
 Mark Rutland <mark.rutland@....com>, Tamas Petz <tamas.petz@....com>, 
 Tamas Zsoldos <tamas.zsoldos@....com>, 
 Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...nel.org>, 
 Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org, 
 Leo Yan <leo.yan@....com>
Subject: [PATCH 11/19] coresight: trbe: Apply overwrite erratum for only
 wrap event

The overwrite erratum occurs only on wrap events, so apply the extra
wrap condition check in the workaround.

Signed-off-by: Leo Yan <leo.yan@....com>
---
 drivers/hwtracing/coresight/coresight-trbe.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c
index e579ea98523c24d23a0cd265dcdd0a46b52b52da..2600af12a8fb94bb8c74efda2a101aacd01b0b34 100644
--- a/drivers/hwtracing/coresight/coresight-trbe.c
+++ b/drivers/hwtracing/coresight/coresight-trbe.c
@@ -714,7 +714,7 @@ static unsigned long trbe_get_trace_size(struct perf_output_handle *handle,
 	 * 64bytes. Thus we ignore the potential triggering of the erratum
 	 * on WRAP and limit the data to LIMIT.
 	 */
-	if (wrap)
+	if (wrap && trbe_may_overwrite_in_fill_mode(buf->cpudata))
 		write = get_trbe_limit_pointer();
 	else
 		write = get_trbe_write_pointer();
@@ -736,7 +736,7 @@ static unsigned long trbe_get_trace_size(struct perf_output_handle *handle,
 	 * the space we skipped with IGNORE packets. And we are always
 	 * guaranteed to have at least a PAGE_SIZE space in the buffer.
 	 */
-	if (trbe_may_overwrite_in_fill_mode(buf->cpudata) &&
+	if (wrap && trbe_may_overwrite_in_fill_mode(buf->cpudata) &&
 	    !WARN_ON(size < overwrite_skip))
 		__trbe_pad_buf(buf, start_off, overwrite_skip);
 

-- 
2.34.1