[RFC PATCH v3 10/12] powerpc: Add support to mask perf interrupts

[Madhavan Srinivasan]

To support masking of the PMI interrupts, couple of new interrupt handler
macros are added MASKABLE_EXCEPTION_PSERIES_OOL and
MASKABLE_RELON_EXCEPTION_PSERIES_OOL.

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

Signed-off-by: Madhavan Srinivasan <maddy at linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/exception-64s.h | 13 +++++++++++++
 arch/powerpc/include/asm/hw_irq.h        |  1 +
 arch/powerpc/kernel/exceptions-64s.S     |  4 ++--
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index 41be0c2d7658..ca40b5c59869 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -427,6 +427,7 @@ label##_relon_hv:						\
 #define SOFTEN_VALUE_0xe62	PACA_IRQ_HMI
 #define SOFTEN_VALUE_0xea0	PACA_IRQ_EE
 #define SOFTEN_VALUE_0xea2	PACA_IRQ_EE
+#define SOFTEN_VALUE_0xf00	PACA_IRQ_PMI
 
 #define __SOFTEN_TEST(h, vec, bitmask)					\
 	lbz	r10,PACASOFTIRQEN(r13);					\
@@ -462,6 +463,12 @@ label##_pSeries:							\
 	_MASKABLE_EXCEPTION_PSERIES(vec, label,				\
 				    EXC_STD, SOFTEN_TEST_PR, bitmask)
 
+#define MASKABLE_EXCEPTION_PSERIES_OOL(vec, label, bitmask)		\
+	.globl label##_pSeries;						\
+label##_pSeries:							\
+	__EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec, bitmask);	\
+	EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_STD);
+
 #define MASKABLE_EXCEPTION_HV(loc, vec, label, bitmask)			\
 	. = loc;							\
 	.globl label##_hv;						\
@@ -490,6 +497,12 @@ label##_relon_pSeries:							\
 	_MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,			\
 					  EXC_STD, SOFTEN_NOTEST_PR, bitmask)
 
+#define MASKABLE_RELON_EXCEPTION_PSERIES_OOL(vec, label, bitmask)	\
+	.globl label##_relon_pSeries;					\
+label##_relon_pSeries:							\
+	__EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_PR, vec, bitmask);\
+	EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_STD);
+
 #define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label, bitmask)		\
 	. = loc;							\
 	.globl label##_relon_hv;					\
diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h
index e457438c6fdf..415734c07cfa 100644
--- a/arch/powerpc/include/asm/hw_irq.h
+++ b/arch/powerpc/include/asm/hw_irq.h
@@ -26,6 +26,7 @@
 #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_enabled
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 6c56554cfcc3..bc2a838e1926 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -580,7 +580,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
 	KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xea2)
 
 	/* moved from 0xf00 */
-	STD_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
+	MASKABLE_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor, IRQ_DISABLE_MASK_PMU)
 	KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf00)
 	STD_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
 	KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf20)
@@ -1126,7 +1126,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_VSX)
 	MASKABLE_RELON_EXCEPTION_HV_OOL(0xea0, h_virt_irq,
 							IRQ_DISABLE_MASK_LINUX)
 
-	STD_RELON_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
+	MASKABLE_RELON_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor, IRQ_DISABLE_MASK_PMU)
 	STD_RELON_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
 	STD_RELON_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
 	STD_RELON_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
-- 
2.7.4