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powerpc/64s: Add new set of irq_soft_mask_ functions for PMI masking 

To support soft-masking of the performance monitor interrupt, a set of
new powerpc_local_irq_pmu_save() and powerpc_local_irq_restore()
functions are added. And powerpc_local_irq_save() implemented, by
adding a new irq_soft_mask manipulation function
irq_soft_mask_or_return().

Local_irq_pmu_* macros are provided to access these
powerpc_local_irq_pmu* functions which includes
trace_hardirqs_on|off() to match what we have in
include/linux/irqflags.h.

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Madhavan Srinivasan 2017-12-20 09:25:55 +05:30 committed by Michael Ellerman
parent 9aa88188ee
commit c6424382de
1 changed files with 67 additions and 0 deletions
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67
arch/powerpc/include/asm/hw_irq.h
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@ -115,6 +115,24 @@ static inline notrace unsigned long irq_soft_mask_set_return(unsigned long mask)
return flags;
}
static inline notrace unsigned long irq_soft_mask_or_return(unsigned long mask)
{
unsigned long flags, tmp;
asm volatile(
"lbz %0,%2(13); or %1,%0,%3; stb %1,%2(13)"
: "=&r" (flags), "=r" (tmp)
: "i" (offsetof(struct paca_struct, irq_soft_mask)),
"r" (mask)
: "memory");
#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
WARN_ON((mask | flags) && !((mask | flags) & IRQS_DISABLED));
#endif
return flags;
}
static inline unsigned long arch_local_save_flags(void)
{
return irq_soft_mask_return();
@ -147,6 +165,55 @@ static inline bool arch_irqs_disabled(void)
return arch_irqs_disabled_flags(arch_local_save_flags());
}
#ifdef CONFIG_PPC_BOOK3S
/*
* To support disabling and enabling of irq with PMI, set of
* new powerpc_local_irq_pmu_save() and powerpc_local_irq_restore()
* functions are added. These macros are implemented using generic
* linux local_irq_* code from include/linux/irqflags.h.
*/
#define raw_local_irq_pmu_save(flags) \
do { \
typecheck(unsigned long, flags); \
flags = irq_soft_mask_or_return(IRQS_DISABLED | \
IRQS_PMI_DISABLED); \
} while(0)
#define raw_local_irq_pmu_restore(flags) \
do { \
typecheck(unsigned long, flags); \
arch_local_irq_restore(flags); \
} while(0)
#ifdef CONFIG_TRACE_IRQFLAGS
#define powerpc_local_irq_pmu_save(flags) \
do { \
raw_local_irq_pmu_save(flags); \
trace_hardirqs_off(); \
} while(0)
#define powerpc_local_irq_pmu_restore(flags) \
do { \
if (raw_irqs_disabled_flags(flags)) { \
raw_local_irq_pmu_restore(flags); \
trace_hardirqs_off(); \
} else { \
trace_hardirqs_on(); \
raw_local_irq_pmu_restore(flags); \
} \
} while(0)
#else
#define powerpc_local_irq_pmu_save(flags) \
do { \
raw_local_irq_pmu_save(flags); \
} while(0)
#define powerpc_local_irq_pmu_restore(flags) \
do { \
raw_local_irq_pmu_restore(flags); \
} while (0)
#endif /* CONFIG_TRACE_IRQFLAGS */
#endif /* CONFIG_PPC_BOOK3S */
#ifdef CONFIG_PPC_BOOK3E
#define __hard_irq_enable() asm volatile("wrteei 1" : : : "memory")
#define __hard_irq_disable() asm volatile("wrteei 0" : : : "memory")