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arm64: Add cpuidle context save/restore helpers

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As we need to start doing some additional work on all idle
paths, let's introduce a set of macros that will perform
the work related to the GICv3 pseudo-NMI idle entry exit.

Stubs are introduced to 32bit ARM for compatibility.
As these helpers are currently unused, there is no functional
change.

Tested-by: Valentin Schneider <valentin.schneider@arm.com>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210615111227.2454465-2-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Marc Zyngier 2021-06-15 12:12:24 +01:00 committed by Will Deacon
parent c4681547bc
commit 8848f0665b
2 changed files with 40 additions and 0 deletions
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5
arch/arm/include/asm/cpuidle.h
View file

@ -49,4 +49,9 @@ extern int arm_cpuidle_suspend(int index);
extern int arm_cpuidle_init(int cpu);
struct arm_cpuidle_irq_context { };
#define arm_cpuidle_save_irq_context(c) (void)c
#define arm_cpuidle_restore_irq_context(c) (void)c
#endif

35
arch/arm64/include/asm/cpuidle.h
View file

@ -18,4 +18,39 @@ static inline int arm_cpuidle_suspend(int index)
return -EOPNOTSUPP;
}
#endif
#ifdef CONFIG_ARM64_PSEUDO_NMI
#include <asm/arch_gicv3.h>
struct arm_cpuidle_irq_context {
unsigned long pmr;
unsigned long daif_bits;
};
#define arm_cpuidle_save_irq_context(__c) \
do { \
struct arm_cpuidle_irq_context *c = __c; \
if (system_uses_irq_prio_masking()) { \
c->daif_bits = read_sysreg(daif); \
write_sysreg(c->daif_bits | PSR_I_BIT | PSR_F_BIT, \
daif); \
c->pmr = gic_read_pmr(); \
gic_write_pmr(GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET); \
} \
} while (0)
#define arm_cpuidle_restore_irq_context(__c) \
do { \
struct arm_cpuidle_irq_context *c = __c; \
if (system_uses_irq_prio_masking()) { \
gic_write_pmr(c->pmr); \
write_sysreg(c->daif_bits, daif); \
} \
} while (0)
#else
struct arm_cpuidle_irq_context { };
#define arm_cpuidle_save_irq_context(c) (void)c
#define arm_cpuidle_restore_irq_context(c) (void)c
#endif
#endif