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powerpc/64s: Add support to mask perf interrupts and replay them

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Two new bit mask field "IRQ_DISABLE_MASK_PMU" is introduced to support
the masking of PMI and "IRQ_DISABLE_MASK_ALL" to aid interrupt masking
checking.

Couple of new irq #defs "PACA_IRQ_PMI" and "SOFTEN_VALUE_0xf0*" added
to use in the exception code to check for PMI interrupts.

In the masked_interrupt handler, for PMIs we reset the MSR[EE] and
return. In the __check_irq_replay(), replay the PMI interrupt by
calling performance_monitor_common handler.

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 09:25:53 +05:30 committed by Michael Ellerman
parent f14e953b19
commit f442d00480
5 changed files with 31 additions and 11 deletions
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5
arch/powerpc/include/asm/exception-64s.h
View file

@ -518,6 +518,7 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
#define SOFTEN_VALUE_0xe80 PACA_IRQ_DBELL
#define SOFTEN_VALUE_0xe60 PACA_IRQ_HMI
#define SOFTEN_VALUE_0xea0 PACA_IRQ_EE
#define SOFTEN_VALUE_0xf00 PACA_IRQ_PMI
#define __SOFTEN_TEST(h, vec, bitmask) \
lbz r10,PACAIRQSOFTMASK(r13); \
@ -582,6 +583,10 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
_MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, \
EXC_STD, SOFTEN_NOTEST_PR, bitmask)
#define MASKABLE_RELON_EXCEPTION_PSERIES_OOL(vec, label, bitmask) \
MASKABLE_EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_PR, vec, bitmask);\
EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD);
#define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label, bitmask) \
_MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, \
EXC_HV, SOFTEN_TEST_HV, bitmask)

19
arch/powerpc/include/asm/hw_irq.h
View file

@ -27,12 +27,15 @@
#define PACA_IRQ_DEC 0x08 /* Or FIT */
#define PACA_IRQ_EE_EDGE 0x10 /* BookE only */
#define PACA_IRQ_HMI 0x20
#define PACA_IRQ_PMI 0x40
/*
* flags for paca->irq_soft_mask
*/
#define IRQS_ENABLED 0
#define IRQS_DISABLED 1
#define IRQS_DISABLED 1 /* local_irq_disable() interrupts */
#define IRQS_PMI_DISABLED 2
#define IRQS_ALL_DISABLED (IRQS_DISABLED | IRQS_PMI_DISABLED)
#endif /* CONFIG_PPC64 */
@ -152,13 +155,13 @@ static inline bool arch_irqs_disabled(void)
#define __hard_irq_disable() __mtmsrd(local_paca->kernel_msr, 1)
#endif
#define hard_irq_disable() do { \
unsigned long flags; \
__hard_irq_disable(); \
flags = irq_soft_mask_set_return(IRQS_DISABLED); \
local_paca->irq_happened |= PACA_IRQ_HARD_DIS; \
if (!arch_irqs_disabled_flags(flags)) \
trace_hardirqs_off(); \
#define hard_irq_disable() do { \
unsigned long flags; \
__hard_irq_disable(); \
flags = irq_soft_mask_set_return(IRQS_ALL_DISABLED); \
local_paca->irq_happened |= PACA_IRQ_HARD_DIS; \
if (!arch_irqs_disabled_flags(flags)) \
trace_hardirqs_off(); \
} while(0)
static inline bool lazy_irq_pending(void)

5
arch/powerpc/kernel/entry_64.S
View file

@ -954,6 +954,11 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
addi r3,r1,STACK_FRAME_OVERHEAD;
bl do_IRQ
b ret_from_except
1: cmpwi cr0,r3,0xf00
bne 1f
addi r3,r1,STACK_FRAME_OVERHEAD;
bl performance_monitor_exception
b ret_from_except
1: cmpwi cr0,r3,0xe60
bne 1f
addi r3,r1,STACK_FRAME_OVERHEAD;

6
arch/powerpc/kernel/exceptions-64s.S
View file

@ -1111,8 +1111,8 @@ EXC_REAL_NONE(0xee0, 0x20)
EXC_VIRT_NONE(0x4ee0, 0x20)
EXC_REAL_OOL(performance_monitor, 0xf00, 0x20)
EXC_VIRT_OOL(performance_monitor, 0x4f00, 0x20, 0xf00)
EXC_REAL_OOL_MASKABLE(performance_monitor, 0xf00, 0x20, IRQS_PMI_DISABLED)
EXC_VIRT_OOL_MASKABLE(performance_monitor, 0x4f00, 0x20, 0xf00, IRQS_PMI_DISABLED)
TRAMP_KVM(PACA_EXGEN, 0xf00)
EXC_COMMON_ASYNC(performance_monitor_common, 0xf00, performance_monitor_exception)
@ -1723,6 +1723,8 @@ BEGIN_FTR_SECTION
FTR_SECTION_ELSE
beq hardware_interrupt_common
ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_300)
cmpwi r3,0xf00
beq performance_monitor_common
BEGIN_FTR_SECTION
cmpwi r3,0xa00
beq h_doorbell_common_msgclr

7
arch/powerpc/kernel/irq.c
View file

@ -186,6 +186,11 @@ notrace unsigned int __check_irq_replay(void)
return 0x900;
}
if (happened & PACA_IRQ_PMI) {
local_paca->irq_happened &= ~PACA_IRQ_PMI;
return 0xf00;
}
if (happened & PACA_IRQ_EE) {
local_paca->irq_happened &= ~PACA_IRQ_EE;
return 0x500;
@ -272,7 +277,7 @@ notrace void arch_local_irq_restore(unsigned long mask)
}
#endif /* CONFIG_TRACE_IRQFLAGS */
irq_soft_mask_set(IRQS_DISABLED);
irq_soft_mask_set(IRQS_ALL_DISABLED);
trace_hardirqs_off();
/*