powerpc/64: Add #defines for paca->soft_enabled flags

Two #defines IRQS_ENABLED and IRQS_DISABLED are added to be used when
updating paca->soft_enabled. Replace the hardcoded values used when
updating paca->soft_enabled with IRQ_(EN|DIS)ABLED #define. No logic
change.
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/exception-64s.h

@@ -499,7 +499,7 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
 
 #define __SOFTEN_TEST(h, vec)						\
 	lbz	r10,PACASOFTIRQEN(r13);					\
-	cmpwi	r10,0;							\
+	cmpwi	r10,IRQS_DISABLED;				\
 	li	r10,SOFTEN_VALUE_##vec;					\
 	beq	masked_##h##interrupt
 

arch/powerpc/include/asm/hw_irq.h

@@ -28,6 +28,12 @@
 #define PACA_IRQ_EE_EDGE	0x10 /* BookE only */
 #define PACA_IRQ_HMI		0x20
 
+/*
+ * flags for paca->soft_enabled
+ */
+#define IRQS_ENABLED	1
+#define IRQS_DISABLED	0
+
 #endif /* CONFIG_PPC64 */
 
 #ifndef __ASSEMBLY__
@@ -60,9 +66,10 @@ static inline unsigned long arch_local_irq_disable(void)
 	unsigned long flags, zero;
 
 	asm volatile(
-		"li %1,0; lbz %0,%2(13); stb %1,%2(13)"
+		"li %1,%3; lbz %0,%2(13); stb %1,%2(13)"
 		: "=r" (flags), "=&r" (zero)
-		: "i" (offsetof(struct paca_struct, soft_enabled))
+		: "i" (offsetof(struct paca_struct, soft_enabled)),\
+		  "i" (IRQS_DISABLED)
 		: "memory");
 
 	return flags;
@@ -72,7 +79,7 @@ extern void arch_local_irq_restore(unsigned long);
 
 static inline void arch_local_irq_enable(void)
 {
-	arch_local_irq_restore(1);
+	arch_local_irq_restore(IRQS_ENABLED);
 }
 
 static inline unsigned long arch_local_irq_save(void)
@@ -82,7 +89,7 @@ static inline unsigned long arch_local_irq_save(void)
 
 static inline bool arch_irqs_disabled_flags(unsigned long flags)
 {
-	return flags == 0;
+	return flags == IRQS_DISABLED;
 }
 
 static inline bool arch_irqs_disabled(void)
@@ -102,9 +109,9 @@ static inline bool arch_irqs_disabled(void)
 	u8 _was_enabled;				\
 	__hard_irq_disable();				\
 	_was_enabled = local_paca->soft_enabled;	\
-	local_paca->soft_enabled = 0;			\
+	local_paca->soft_enabled = IRQS_DISABLED;\
 	local_paca->irq_happened |= PACA_IRQ_HARD_DIS;	\
-	if (_was_enabled)				\
+	if (_was_enabled == IRQS_ENABLED)	\
 		trace_hardirqs_off();			\
 } while(0)
 
@@ -127,7 +134,7 @@ static inline void may_hard_irq_enable(void)
 
 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
 {
-	return !regs->softe;
+	return (regs->softe == IRQS_DISABLED);
 }
 
 extern bool prep_irq_for_idle(void);

arch/powerpc/include/asm/irqflags.h

@@ -49,8 +49,8 @@
 #define RECONCILE_IRQ_STATE(__rA, __rB)		\
 	lbz	__rA,PACASOFTIRQEN(r13);	\
 	lbz	__rB,PACAIRQHAPPENED(r13);	\
-	cmpwi	cr0,__rA,0;			\
-	li	__rA,0;				\
+	cmpwi	cr0,__rA,IRQS_DISABLED;\
+	li	__rA,IRQS_DISABLED;	\
 	ori	__rB,__rB,PACA_IRQ_HARD_DIS;	\
 	stb	__rB,PACAIRQHAPPENED(r13);	\
 	beq	44f;				\
@@ -64,7 +64,7 @@
 
 #define RECONCILE_IRQ_STATE(__rA, __rB)		\
 	lbz	__rA,PACAIRQHAPPENED(r13);	\
-	li	__rB,0;				\
+	li	__rB,IRQS_DISABLED;	\
 	ori	__rA,__rA,PACA_IRQ_HARD_DIS;	\
 	stb	__rB,PACASOFTIRQEN(r13);	\
 	stb	__rA,PACAIRQHAPPENED(r13)

arch/powerpc/include/asm/kvm_ppc.h

@@ -873,7 +873,7 @@ static inline void kvmppc_fix_ee_before_entry(void)
 
 	/* Only need to enable IRQs by hard enabling them after this */
 	local_paca->irq_happened = 0;
-	local_paca->soft_enabled = 1;
+	local_paca->soft_enabled = IRQS_ENABLED;
 #endif
 }
 

arch/powerpc/kernel/entry_64.S

@@ -130,7 +130,7 @@ END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR)
 	 */
 #if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_BUG)
 	lbz	r10,PACASOFTIRQEN(r13)
-	xori	r10,r10,1
+	xori	r10,r10,IRQS_ENABLED
 1:	tdnei	r10,0
 	EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,BUGFLAG_WARNING
 #endif
@@ -147,7 +147,7 @@ system_call:			/* label this so stack traces look sane */
 	/* We do need to set SOFTE in the stack frame or the return
 	 * from interrupt will be painful
 	 */
-	li	r10,1
+	li	r10,IRQS_ENABLED
 	std	r10,SOFTE(r1)
 
 	CURRENT_THREAD_INFO(r11, r1)
@@ -743,7 +743,7 @@ resume_kernel:
 	lwz	r8,TI_PREEMPT(r9)
 	cmpwi	cr1,r8,0
 	ld	r0,SOFTE(r1)
-	cmpdi	r0,0
+	cmpdi	r0,IRQS_DISABLED
 	crandc	eq,cr1*4+eq,eq
 	bne	restore
 
@@ -783,11 +783,11 @@ restore:
 	 */
 	ld	r5,SOFTE(r1)
 	lbz	r6,PACASOFTIRQEN(r13)
-	cmpwi	cr0,r5,0
+	cmpwi	cr0,r5,IRQS_DISABLED
 	beq	.Lrestore_irq_off
 
 	/* We are enabling, were we already enabled ? Yes, just return */
-	cmpwi	cr0,r6,1
+	cmpwi	cr0,r6,IRQS_ENABLED
 	beq	cr0,.Ldo_restore
 
 	/*
@@ -806,7 +806,7 @@ restore:
 	 */
 .Lrestore_no_replay:
 	TRACE_ENABLE_INTS
-	li	r0,1
+	li	r0,IRQS_ENABLED
 	stb	r0,PACASOFTIRQEN(r13);
 
 	/*
@@ -915,7 +915,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
 #if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_BUG)
 	/* The interrupt should not have soft enabled. */
 	lbz	r7,PACASOFTIRQEN(r13)
-1:	tdnei	r7,0
+1:	tdnei	r7,IRQS_DISABLED
 	EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,BUGFLAG_WARNING
 #endif
 	b	.Ldo_restore
@@ -1036,7 +1036,7 @@ _GLOBAL(enter_rtas)
 	 * check it with the asm equivalent of WARN_ON
 	 */
 	lbz	r0,PACASOFTIRQEN(r13)
-1:	tdnei	r0,0
+1:	tdnei	r0,IRQS_DISABLED
 	EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,BUGFLAG_WARNING
 #endif
 	

arch/powerpc/kernel/exceptions-64e.S

@@ -210,9 +210,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
 	ld	r5,SOFTE(r1)
 
 	/* Interrupts had better not already be enabled... */
-	twnei	r6,0
+	twnei	r6,IRQS_DISABLED
 
-	cmpwi	cr0,r5,0
+	cmpwi	cr0,r5,IRQS_DISABLED
 	beq	1f
 
 	TRACE_ENABLE_INTS
@@ -352,7 +352,7 @@ ret_from_mc_except:
 
 #define PROLOG_ADDITION_MASKABLE_GEN(n)					    \
 	lbz	r10,PACASOFTIRQEN(r13); /* are irqs soft-disabled ? */	    \
-	cmpwi	cr0,r10,0;		/* yes -> go out of line */	    \
+	cmpwi	cr0,r10,IRQS_DISABLED;	/* yes -> go out of line */ \
 	beq	masked_interrupt_book3e_##n
 
 #define PROLOG_ADDITION_2REGS_GEN(n)					    \

arch/powerpc/kernel/head_64.S

@@ -765,7 +765,7 @@ _GLOBAL(pmac_secondary_start)
 	/* Mark interrupts soft and hard disabled (they might be enabled
 	 * in the PACA when doing hotplug)
 	 */
-	li	r0,0
+	li	r0,IRQS_DISABLED
 	stb	r0,PACASOFTIRQEN(r13)
 	li	r0,PACA_IRQ_HARD_DIS
 	stb	r0,PACAIRQHAPPENED(r13)
@@ -822,6 +822,7 @@ __secondary_start:
 	/* Mark interrupts soft and hard disabled (they might be enabled
 	 * in the PACA when doing hotplug)
 	 */
+	li	r7,IRQS_DISABLED
 	stb	r7,PACASOFTIRQEN(r13)
 	li	r0,PACA_IRQ_HARD_DIS
 	stb	r0,PACAIRQHAPPENED(r13)
@@ -988,7 +989,7 @@ start_here_common:
 	/* Mark interrupts soft and hard disabled (they might be enabled
 	 * in the PACA when doing hotplug)
 	 */
-	li	r0,0
+	li	r0,IRQS_DISABLED
 	stb	r0,PACASOFTIRQEN(r13)
 	li	r0,PACA_IRQ_HARD_DIS
 	stb	r0,PACAIRQHAPPENED(r13)

arch/powerpc/kernel/idle_book3e.S

@@ -17,6 +17,7 @@
 #include <asm/processor.h>
 #include <asm/thread_info.h>
 #include <asm/epapr_hcalls.h>
+#include <asm/hw_irq.h>
 
 /* 64-bit version only for now */
 #ifdef CONFIG_PPC64
@@ -46,7 +47,7 @@ _GLOBAL(\name)
 	bl	trace_hardirqs_on
 	addi    r1,r1,128
 #endif
-	li	r0,1
+	li	r0,IRQS_ENABLED
 	stb	r0,PACASOFTIRQEN(r13)
 	
 	/* Interrupts will make use return to LR, so get something we want

arch/powerpc/kernel/idle_power4.S

@@ -15,6 +15,7 @@
 #include <asm/ppc_asm.h>
 #include <asm/asm-offsets.h>
 #include <asm/irqflags.h>
+#include <asm/hw_irq.h>
 
 #undef DEBUG
 
@@ -53,7 +54,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP)
 	mfmsr	r7
 #endif /* CONFIG_TRACE_IRQFLAGS */
 
-	li	r0,1
+	li	r0,IRQS_ENABLED
 	stb	r0,PACASOFTIRQEN(r13)	/* we'll hard-enable shortly */
 BEGIN_FTR_SECTION
 	DSSALL

arch/powerpc/kernel/irq.c

@@ -67,6 +67,7 @@
 #include <asm/smp.h>
 #include <asm/livepatch.h>
 #include <asm/asm-prototypes.h>
+#include <asm/hw_irq.h>
 
 #ifdef CONFIG_PPC64
 #include <asm/paca.h>
@@ -231,7 +232,7 @@ notrace void arch_local_irq_restore(unsigned long en)
 
 	/* Write the new soft-enabled value */
 	set_soft_enabled(en);
-	if (!en)
+	if (en == IRQS_DISABLED)
 		return;
 	/*
 	 * From this point onward, we can take interrupts, preempt,
@@ -276,7 +277,7 @@ notrace void arch_local_irq_restore(unsigned long en)
 	}
 #endif /* CONFIG_TRACE_IRQFLAGS */
 
-	set_soft_enabled(0);
+	set_soft_enabled(IRQS_DISABLED);
 	trace_hardirqs_off();
 
 	/*
@@ -288,7 +289,7 @@ notrace void arch_local_irq_restore(unsigned long en)
 
 	/* We can soft-enable now */
 	trace_hardirqs_on();
-	set_soft_enabled(1);
+	set_soft_enabled(IRQS_ENABLED);
 
 	/*
 	 * And replay if we have to. This will return with interrupts
@@ -363,7 +364,7 @@ bool prep_irq_for_idle(void)
 	 * of entering the low power state.
 	 */
 	local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS;
-	local_paca->soft_enabled = 1;
+	local_paca->soft_enabled = IRQS_ENABLED;
 
 	/* Tell the caller to enter the low power state */
 	return true;

arch/powerpc/kernel/process.c

@@ -57,6 +57,7 @@
 #include <asm/debug.h>
 #ifdef CONFIG_PPC64
 #include <asm/firmware.h>
+#include <asm/hw_irq.h>
 #endif
 #include <asm/code-patching.h>
 #include <asm/exec.h>
@@ -1674,7 +1675,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 			childregs->gpr[14] = ppc_function_entry((void *)usp);
 #ifdef CONFIG_PPC64
 		clear_tsk_thread_flag(p, TIF_32BIT);
-		childregs->softe = 1;
+		childregs->softe = IRQS_ENABLED;
 #endif
 		childregs->gpr[15] = kthread_arg;
 		p->thread.regs = NULL;	/* no user register state */

arch/powerpc/kernel/setup_64.c

@@ -66,6 +66,7 @@
 #include <asm/livepatch.h>
 #include <asm/opal.h>
 #include <asm/cputhreads.h>
+#include <asm/hw_irq.h>
 
 #include "setup.h"
 
@@ -187,6 +188,8 @@ static void __init fixup_boot_paca(void)
 	get_paca()->cpu_start = 1;
 	/* Allow percpu accesses to work until we setup percpu data */
 	get_paca()->data_offset = 0;
+	/* Mark interrupts disabled in PACA */
+	get_paca()->soft_enabled = IRQS_DISABLED;
 }
 
 static void __init configure_exceptions(void)

arch/powerpc/kernel/time.c

@@ -253,7 +253,7 @@ void accumulate_stolen_time(void)
 	 * needs to reflect that so various debug stuff doesn't
 	 * complain
 	 */
-	local_paca->soft_enabled = 0;
+	local_paca->soft_enabled = IRQS_DISABLED;
 
 	sst = scan_dispatch_log(acct->starttime_user);
 	ust = scan_dispatch_log(acct->starttime);

arch/powerpc/mm/hugetlbpage.c

@@ -752,7 +752,7 @@ void flush_dcache_icache_hugepage(struct page *page)
  * So long as we atomically load page table pointers we are safe against teardown,
  * we can follow the address down to the the page and take a ref on it.
  * This function need to be called with interrupts disabled. We use this variant
- * when we have MSR[EE] = 0 but the paca->soft_enabled = 1
+ * when we have MSR[EE] = 0 but the paca->soft_enabled = IRQS_ENABLED
  */
 pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
 			bool *is_thp, unsigned *hpage_shift)

arch/powerpc/perf/core-book3s.c

@@ -322,7 +322,7 @@ static inline void perf_read_regs(struct pt_regs *regs)
  */
 static inline int perf_intr_is_nmi(struct pt_regs *regs)
 {
-	return !regs->softe;
+	return (regs->softe == IRQS_DISABLED);
 }
 
 /*