linux-kernel - [PATCH v5 06/15] coresight: trbe: Add a helper to pad a given buffer area

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20211014223125.2605031-7-suzuki.poulose@arm.com>
Date:   Thu, 14 Oct 2021 23:31:16 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     will@...nel.org, mathieu.poirier@...aro.org
Cc:     catalin.marinas@....com, anshuman.khandual@....com,
        mike.leach@...aro.org, leo.yan@...aro.org, maz@...nel.org,
        coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v5 06/15] coresight: trbe: Add a helper to pad a given buffer area

Refactor the helper to pad a given AUX buffer area to allow
"filling" ignore packets, without moving any handle pointers.
This will be useful in working around errata, where we may
have to fill the buffer after a session.

Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Mike Leach <mike.leach@...aro.org>
Cc: Leo Yan <leo.yan@...aro.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>
Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 drivers/hwtracing/coresight/coresight-trbe.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c
index 5902ef41bfb8..3de03136285f 100644
--- a/drivers/hwtracing/coresight/coresight-trbe.c
+++ b/drivers/hwtracing/coresight/coresight-trbe.c
@@ -199,12 +199,18 @@ static void trbe_stop_and_truncate_event(struct perf_output_handle *handle)
  * consumed from the user space. The enabled TRBE buffer area is a moving subset of
  * the allocated perf auxiliary buffer.
  */
+
+static void __trbe_pad_buf(struct trbe_buf *buf, u64 offset, int len)
+{
+	memset((void *)buf->trbe_base + offset, ETE_IGNORE_PACKET, len);
+}
+
 static void trbe_pad_buf(struct perf_output_handle *handle, int len)
 {
 	struct trbe_buf *buf = etm_perf_sink_config(handle);
 	u64 head = PERF_IDX2OFF(handle->head, buf);
 
-	memset((void *)buf->trbe_base + head, ETE_IGNORE_PACKET, len);
+	__trbe_pad_buf(buf, head, len);
 	if (!buf->snapshot)
 		perf_aux_output_skip(handle, len);
 }
-- 
2.25.4