Suzuki K Poulose dcfecfa444 coresight: trbe: Prohibit trace before disabling TRBE ... When the TRBE generates an IRQ, we stop the TRBE, collect the trace and then reprogram the TRBE with the updated buffer pointers, whenever possible. We might also leave the TRBE disabled, if there is not enough space left in the buffer. However, we do not touch the ETE at all during all of this. This means the ETE is only disabled when the event is disabled later (via irq_work). This is incorrect, as the ETE trace is still ON without actually being captured and may be routed to the ATB (even if it is for a short duration). So, we move the CPU into trace prohibited state always before disabling the TRBE, upon entering the IRQ handler. The state is restored if the TRBE is enabled back. Otherwise the trace remains prohibited. Since, the ETM/ETE driver now controls the TRFCR_EL1 per session, the tracing can be restored/enabled back when the event is rescheduled in. Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Mike Leach <mike.leach@linaro.org> Cc: Leo Yan <leo.yan@linaro.org> Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20210923143919.2944311-6-suzuki.poulose@arm.com Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>		2021-10-27 11:45:33 -06:00
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coresight	coresight: trbe: Prohibit trace before disabling TRBE	2021-10-27 11:45:33 -06:00
intel_th	bus: Make remove callback return void	2021-07-21 11:53:42 +02:00
stm	stm class: Use correct UUID APIs	2021-04-16 07:26:50 +02:00
Kconfig	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00