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. And powerpc_local_irq_save() implemented,
by adding a new soft_enabled manipulation function soft_enabled_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 <ma...@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/hw_irq.h | 62 ++++++++++++++++++++++++++++++++++++++-
arch/powerpc/kernel/irq.c | 4 +++
2 files changed, 65 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/hw_irq.h
b/arch/powerpc/include/asm/hw_irq.h
index ac9a17ea1d66..7be90b73a943 100644
--- a/arch/powerpc/include/asm/hw_irq.h
+++ b/arch/powerpc/include/asm/hw_irq.h
@@ -90,6 +90,20 @@ static inline notrace unsigned long
soft_enabled_set_return(unsigned long enable
return flags;
}
+static inline notrace unsigned long soft_enabled_or_return(unsigned long
enable)
+{
+ unsigned long flags, zero;
+
+ asm volatile(
+ "mr %1,%3; lbz %0,%2(13); or %1,%0,%1; stb %1,%2(13)"
+ : "=r" (flags), "=&r"(zero)
+ : "i" (offsetof(struct paca_struct, soft_enabled)),\
+ "r" (enable)
+ : "memory");
+
+ return flags;
+}
+
static inline unsigned long arch_local_save_flags(void)
{
return soft_enabled_return();
@@ -114,7 +128,7 @@ static inline unsigned long arch_local_irq_save(void)
static inline bool arch_irqs_disabled_flags(unsigned long flags)
{
- return flags == IRQ_DISABLE_MASK_LINUX;
+ return flags & IRQ_DISABLE_MASK_LINUX;
}
static inline bool arch_irqs_disabled(void)
@@ -122,6 +136,52 @@ static inline bool arch_irqs_disabled(void)
return arch_irqs_disabled_flags(arch_local_save_flags());
}
+/*
+ * 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 = soft_enabled_or_return(IRQ_DISABLE_MASK_LINUX | \
+ IRQ_DISABLE_MASK_PMU); \
+ } 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 */
+
#ifdef CONFIG_PPC_BOOK3E
#define __hard_irq_enable() asm volatile("wrteei 1" : : : "memory")
#define __hard_irq_disable() asm volatile("wrteei 0" : : : "memory")
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 299b55071612..9010f996e238 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -227,6 +227,10 @@ notrace void arch_local_irq_restore(unsigned long en)
unsigned char irq_happened;
unsigned int replay;
+#ifdef CONFIG_IRQ_DEBUG_SUPPORT
+ WARN_ON(en & local_paca->soft_enabled & ~IRQ_DISABLE_MASK_LINUX);
+#endif
+
/* Write the new soft-enabled value */
soft_enabled_set(en);
--
2.7.4
