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Leo Yan 38e5e8b4d6 coresight: etm4x: Add context synchronization before enabling trace ... [ Upstream commit 64eb04ae54 ] 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: 1ab3bb9df5 ("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 Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-12-18 13:54:57 +01:00
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coresight	coresight: etm4x: Add context synchronization before enabling trace	2025-12-18 13:54:57 +01:00
intel_th	intel_th: avoid using deprecated page->mapping, index fields	2025-05-29 11:01:58 +02:00
ptt	hwtracing: hisi_ptt: Assign parent for event_source device	2024-05-02 11:36:11 +01:00
stm	[tree-wide] finally take no_llseek out	2024-09-27 08:18:43 -07:00
Kconfig	hwtracing: hisi_ptt: Add trace function support for HiSilicon PCIe Tune and Trace device	2022-09-08 16:26:17 -06:00