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arm64: suspend: Use cpuidle context helpers in cpu_suspend()

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Use cpuidle context helpers to switch to using DAIF.IF instead
of PMR to mask interrupts, ensuring that we suspend with
interrupts being able to reach the CPU interface.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/20210615111227.2454465-5-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Marc Zyngier 2021-06-15 12:12:27 +01:00 committed by Will Deacon
parent c9223b6162
commit 77345ef704
1 changed files with 11 additions and 1 deletions
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12
arch/arm64/kernel/suspend.c
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@ -7,6 +7,7 @@
#include <asm/alternative.h>
#include <asm/cacheflush.h>
#include <asm/cpufeature.h>
#include <asm/cpuidle.h>
#include <asm/daifflags.h>
#include <asm/debug-monitors.h>
#include <asm/exec.h>
@ -91,6 +92,7 @@ int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
int ret = 0;
unsigned long flags;
struct sleep_stack_data state;
struct arm_cpuidle_irq_context context;
/* Report any MTE async fault before going to suspend */
mte_suspend_enter();
@ -103,12 +105,18 @@ int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
flags = local_daif_save();
/*
* Function graph tracer state gets incosistent when the kernel
* Function graph tracer state gets inconsistent when the kernel
* calls functions that never return (aka suspend finishers) hence
* disable graph tracing during their execution.
*/
pause_graph_tracing();
/*
* Switch to using DAIF.IF instead of PMR in order to reliably
* resume if we're using pseudo-NMIs.
*/
arm_cpuidle_save_irq_context(&context);
if (__cpu_suspend_enter(&state)) {
/* Call the suspend finisher */
ret = fn(arg);
@ -126,6 +134,8 @@ int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
RCU_NONIDLE(__cpu_suspend_exit());
}
arm_cpuidle_restore_irq_context(&context);
unpause_graph_tracing();
/*