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| author | Leo Yan <leo.yan@arm.com> | 2025-11-11 21:58:39 +0300 |
|---|---|---|
| committer | Suzuki K Poulose <suzuki.poulose@arm.com> | 2025-11-12 00:47:58 +0300 |
| commit | 64eb04ae545294e105ad91714dc3167a0b660731 (patch) | |
| tree | e6cb0a0cd6c73d42261bba1fc32dc97f890231ed /scripts | |
| parent | 4dc4e22f9536341255f5de6047977a80ff47eaef (diff) | |
| download | linux-64eb04ae545294e105ad91714dc3167a0b660731.tar.xz | |
coresight: etm4x: Add context synchronization before enabling trace
According to the software usage PKLXF in Arm ARM (ARM DDI 0487 L.a), a
Context synchronization event is required before enabling the trace
unit.
An ISB is added to meet this requirement, particularly for guarding the
operations in the flow:
etm4x_allow_trace()
`> kvm_tracing_set_el1_configuration()
`> write_sysreg_s(trfcr_while_in_guest, SYS_TRFCR_EL12)
Improved the barrier comments to provide more accurate information.
Fixes: 1ab3bb9df5e3 ("coresight: etm4x: Add necessary synchronization for sysreg access")
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Reviewed-by: Yeoreun Yun <yeoreum.yun@arm.com>
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-v6-5-f55553b6c8b3@arm.com
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions