coresight: etm3x: Always set tracer's device mode on target CPU

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[ Upstream commit ab3fde32af ]

The ETMv3 driver shares the same issue as ETMv4 regarding race
conditions when accessing the device mode.

This commit applies the same fix: ensuring that the device mode is
modified only by the target CPU to eliminate race conditions across
CPUs.

Fixes: 22fd532eaa ("coresight: etm3x: adding operation mode for etm_enable()")
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Tested-by: James Clark <james.clark@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20251111-arm_coresight_power_management_fix-v6-3-f55553b6c8b3@arm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Leo Yan 2025-11-11 18:58:37 +00:00 • committed by Greg Kroah-Hartman

parent e45178e988

commit 9698a89977

1 changed files with 40 additions and 19 deletions

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drivers/hwtracing/coresight/coresight-etm3x-core.c

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