[PATCH v7 08/11] powerpc: Add support to mask perf interrupts and replay them
Madhavan Srinivasan
maddy at linux.vnet.ibm.com
Wed Apr 12 18:00:37 AEST 2017
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 at linux.vnet.ibm.com>
---
arch/powerpc/include/asm/exception-64s.h | 5 +++++
arch/powerpc/include/asm/hw_irq.h | 5 ++++-
arch/powerpc/kernel/entry_64.S | 5 +++++
arch/powerpc/kernel/exceptions-64s.S | 6 ++++--
arch/powerpc/kernel/irq.c | 24 +++++++++++++++++++++++-
5 files changed, 41 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index 72c96162c492..b59f02f9acce 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -474,6 +474,7 @@ 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,PACASOFTIRQEN(r13); \
@@ -538,6 +539,10 @@ 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)
diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h
index fa23c73d2f7a..e21553e9bfc9 100644
--- a/arch/powerpc/include/asm/hw_irq.h
+++ b/arch/powerpc/include/asm/hw_irq.h
@@ -26,12 +26,15 @@
#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->soft_disable_mask
*/
#define IRQ_DISABLE_MASK_NONE 0
#define IRQ_DISABLE_MASK_LINUX 1
+#define IRQ_DISABLE_MASK_PMU 2
+#define IRQ_DISABLE_MASK_ALL 3
#endif /* CONFIG_PPC64 */
@@ -132,7 +135,7 @@ static inline bool arch_irqs_disabled(void)
u8 _was_enabled; \
__hard_irq_disable(); \
_was_enabled = local_paca->soft_disable_mask; \
- local_paca->soft_disable_mask = IRQ_DISABLE_MASK_LINUX;\
+ local_paca->soft_disable_mask = IRQ_DISABLE_MASK_ALL;\
local_paca->irq_happened |= PACA_IRQ_HARD_DIS; \
if (!(_was_enabled & IRQ_DISABLE_MASK_LINUX)) \
trace_hardirqs_off(); \
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index f3afa0b9332d..d021f7de79bd 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -931,6 +931,11 @@ restore_check_irq_replay:
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;
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 5c93a1700d83..c473f8779646 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -1046,8 +1046,8 @@ 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, IRQ_DISABLE_MASK_PMU)
+EXC_VIRT_OOL_MASKABLE(performance_monitor, 0x4f00, 0x20, 0xf00, IRQ_DISABLE_MASK_PMU)
TRAMP_KVM(PACA_EXGEN, 0xf00)
EXC_COMMON_ASYNC(performance_monitor_common, 0xf00, performance_monitor_exception)
@@ -1594,6 +1594,8 @@ _GLOBAL(__replay_interrupt)
beq decrementer_common
cmpwi r3,0x500
beq hardware_interrupt_common
+ cmpwi r3,0xf00
+ beq performance_monitor_common
BEGIN_FTR_SECTION
cmpwi r3,0xe80
beq h_doorbell_common
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index fdd817a6f9f8..835a08d9c48f 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -169,6 +169,27 @@ notrace unsigned int __check_irq_replay(void)
if ((happened & PACA_IRQ_DEC) || decrementer_check_overflow())
return 0x900;
+ /*
+ * In masked_handler() for PMI, we disable MSR[EE] and return.
+ * Replay it here.
+ *
+ * After this point, PMIs could still be disabled in certain
+ * scenarios like this one.
+ *
+ * local_irq_disable();
+ * powerpc_irq_pmu_save();
+ * powerpc_irq_pmu_restore();
+ * local_irq_restore();
+ *
+ * Even though powerpc_irq_pmu_restore() would have replayed the PMIs
+ * if any, we have still not enabled EE and this will happen only at
+ * complition of last *_restore in this nested cases. And PMIs will
+ * once again start firing only when we have MSR[EE] enabled.
+ */
+ local_paca->irq_happened &= ~PACA_IRQ_PMI;
+ if (happened & PACA_IRQ_PMI)
+ return 0xf00;
+
/* Finally check if an external interrupt happened */
local_paca->irq_happened &= ~PACA_IRQ_EE;
if (happened & PACA_IRQ_EE)
@@ -208,7 +229,8 @@ notrace void arch_local_irq_restore(unsigned long en)
/* Write the new soft-enabled value */
soft_disable_mask_set(en);
- if (en == IRQ_DISABLE_MASK_LINUX)
+ /* any bits still disabled */
+ if (en)
return;
/*
* From this point onward, we can take interrupts, preempt,
--
2.7.4
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