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arm64: Unmask PMR before going idle

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CPU does not received signals for interrupts with a priority masked by
ICC_PMR_EL1. This means the CPU might not come back from a WFI
instruction.

Make sure ICC_PMR_EL1 does not mask interrupts when doing a WFI.

Since the logic of cpu_do_idle is becoming a bit more complex than just
two instructions, lets turn it from ASM to C.

Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Suggested-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Julien Thierry
2019-01-31 14:58:47 +00:00
committed by Catalin Marinas
parent 133d051863
commit a9806aa259
2 changed files with 45 additions and 11 deletions
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11
arch/arm64/mm/proc.S
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@@ -55,17 +55,6 @@
#define MAIR(attr, mt) ((attr) << ((mt) * 8))
/*
* cpu_do_idle()
*
* Idle the processor (wait for interrupt).
*/
ENTRY(cpu_do_idle)
dsb sy // WFI may enter a low-power mode
wfi
ret
ENDPROC(cpu_do_idle)
#ifdef CONFIG_CPU_PM
/**
* cpu_do_suspend - save CPU registers context