linux-kernel - [PATCH AUTOSEL 6.1 03/27] perf cs-etm: Bump minimum OpenCSD version to ensure a bugfix is present

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Message-ID: <20240128161424.203600-3-sashal@kernel.org>
Date: Sun, 28 Jan 2024 11:13:48 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: James Clark <james.clark@....com>,
	Ian Rogers <irogers@...gle.com>,
	Leo Yan <leo.yan@...aro.org>,
	John Garry <john.g.garry@...cle.com>,
	Mike Leach <mike.leach@...aro.org>,
	Will Deacon <will@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 6.1 03/27] perf cs-etm: Bump minimum OpenCSD version to ensure a bugfix is present

From: James Clark <james.clark@....com>

[ Upstream commit 2dbba30fd69b604802a9535b74bddb5bcca23793 ]

Since commit d927ef5004ef ("perf cs-etm: Add exception level consistency
check"), the exception that was added to Perf will be triggered unless
the following bugfix from OpenCSD is present:

 - _Version 1.2.1_:
  - __Bugfix__:
    ETM4x / ETE - output of context elements to client can in some
    circumstances be delayed until after subsequent atoms have been
    processed leading to incorrect memory decode access via the client
    callbacks. Fixed to flush context elements immediately they are
    committed.

Rather than remove the assert and silently fail, just increase the
minimum version requirement to avoid hard to debug issues and
regressions.

Reviewed-by: Ian Rogers <irogers@...gle.com>
Signed-off-by: James Clark <james.clark@....com>
Tested-by: Leo Yan <leo.yan@...aro.org>
Cc: John Garry <john.g.garry@...cle.com>
Cc: Mike Leach <mike.leach@...aro.org>
Cc: Will Deacon <will@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org
Link: https://lore.kernel.org/r/20230901133716.677499-1-james.clark@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/build/feature/test-libopencsd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/build/feature/test-libopencsd.c b/tools/build/feature/test-libopencsd.c
index eb6303ff446e..4cfcef9da3e4 100644
--- a/tools/build/feature/test-libopencsd.c
+++ b/tools/build/feature/test-libopencsd.c
@@ -4,9 +4,9 @@
 /*
  * Check OpenCSD library version is sufficient to provide required features
  */
-#define OCSD_MIN_VER ((1 << 16) | (1 << 8) | (1))
+#define OCSD_MIN_VER ((1 << 16) | (2 << 8) | (1))
 #if !defined(OCSD_VER_NUM) || (OCSD_VER_NUM < OCSD_MIN_VER)
-#error "OpenCSD >= 1.1.1 is required"
+#error "OpenCSD >= 1.2.1 is required"
 #endif
 
 int main(void)
-- 
2.43.0