On Thu, 15 Sep 2016 18:31:59 +0530 Madhavan Srinivasan <ma...@linux.vnet.ibm.com> wrote:
> Currently soft_enabled is used as the flag to determine > the interrupt state. Patch extends the soft_enabled > to be used as a mask instead of a flag. This should be the title of the patch, IMO. Introducing the new mask bit is incidental (and could be moved to patch 11). The key here of course is switching the tests from a flag to a mask. Very cool that you got this all worked out without adding any new instructions. Reviewed-by: Nicholas Piggin <npig...@gmail.com> > > Signed-off-by: Madhavan Srinivasan <ma...@linux.vnet.ibm.com> > --- > arch/powerpc/include/asm/exception-64s.h | 4 ++-- > arch/powerpc/include/asm/hw_irq.h | 1 + > arch/powerpc/include/asm/irqflags.h | 4 ++-- > arch/powerpc/kernel/entry_64.S | 4 ++-- > arch/powerpc/kernel/exceptions-64e.S | 6 +++--- > 5 files changed, 10 insertions(+), 9 deletions(-) > > diff --git a/arch/powerpc/include/asm/exception-64s.h > b/arch/powerpc/include/asm/exception-64s.h > index dd3253bd0d8e..1eea4ab75607 100644 > --- a/arch/powerpc/include/asm/exception-64s.h > +++ b/arch/powerpc/include/asm/exception-64s.h > @@ -430,9 +430,9 @@ label##_relon_hv: > \ > > #define __SOFTEN_TEST(h, vec) > \ > lbz r10,PACASOFTIRQEN(r13); \ > - cmpwi r10,IRQ_DISABLE_MASK_LINUX; > \ > + andi. r10,r10,IRQ_DISABLE_MASK_LINUX; \ > li r10,SOFTEN_VALUE_##vec; \ > - beq masked_##h##interrupt > + bne masked_##h##interrupt > #define _SOFTEN_TEST(h, vec) __SOFTEN_TEST(h, vec) > > #define SOFTEN_TEST_PR(vec) \ > diff --git a/arch/powerpc/include/asm/hw_irq.h > b/arch/powerpc/include/asm/hw_irq.h > index fd9b421f9020..245262c02bab 100644 > --- a/arch/powerpc/include/asm/hw_irq.h > +++ b/arch/powerpc/include/asm/hw_irq.h > @@ -32,6 +32,7 @@ > */ > #define IRQ_DISABLE_MASK_NONE 0 > #define IRQ_DISABLE_MASK_LINUX 1 > +#define IRQ_DISABLE_MASK_PMU 2 > > #endif /* CONFIG_PPC64 */ > > diff --git a/arch/powerpc/include/asm/irqflags.h > b/arch/powerpc/include/asm/irqflags.h > index d0ed2a7d7d10..9ff09747a226 100644 > --- a/arch/powerpc/include/asm/irqflags.h > +++ b/arch/powerpc/include/asm/irqflags.h > @@ -48,11 +48,11 @@ > #define RECONCILE_IRQ_STATE(__rA, __rB) \ > lbz __rA,PACASOFTIRQEN(r13); \ > lbz __rB,PACAIRQHAPPENED(r13); \ > - cmpwi cr0,__rA,IRQ_DISABLE_MASK_LINUX;\ > + andi. __rA,__rA,IRQ_DISABLE_MASK_LINUX;\ > li __rA,IRQ_DISABLE_MASK_LINUX; \ > ori __rB,__rB,PACA_IRQ_HARD_DIS; \ > stb __rB,PACAIRQHAPPENED(r13); \ > - beq 44f; \ > + bne 44f; \ > stb __rA,PACASOFTIRQEN(r13); \ > TRACE_DISABLE_INTS; \ > 44: > diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S > index 879aeb11ad29..533e363914a9 100644 > --- a/arch/powerpc/kernel/entry_64.S > +++ b/arch/powerpc/kernel/entry_64.S > @@ -764,8 +764,8 @@ restore: > */ > ld r5,SOFTE(r1) > lbz r6,PACASOFTIRQEN(r13) > - cmpwi cr0,r5,IRQ_DISABLE_MASK_LINUX > - beq restore_irq_off > + andi. r5,r5,IRQ_DISABLE_MASK_LINUX > + bne restore_irq_off > > /* We are enabling, were we already enabled ? Yes, just return */ > cmpwi cr0,r6,IRQ_DISABLE_MASK_NONE > diff --git a/arch/powerpc/kernel/exceptions-64e.S > b/arch/powerpc/kernel/exceptions-64e.S > index 5c628b5696f6..8e40df2c2f30 100644 > --- a/arch/powerpc/kernel/exceptions-64e.S > +++ b/arch/powerpc/kernel/exceptions-64e.S > @@ -212,8 +212,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) > /* Interrupts had better not already be enabled... */ > twnei r6,IRQ_DISABLE_MASK_LINUX > > - cmpwi cr0,r5,IRQ_DISABLE_MASK_LINUX > - beq 1f > + andi. r5,r5,IRQ_DISABLE_MASK_LINUX > + bne 1f > > TRACE_ENABLE_INTS > stb r5,PACASOFTIRQEN(r13) > @@ -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,IRQ_DISABLE_MASK_LINUX;/* yes -> go out of line */ \ > + andi. r10,r10,IRQ_DISABLE_MASK_LINUX;/* yes -> go out of line */ \ > beq masked_interrupt_book3e_##n > > #define PROLOG_ADDITION_2REGS_GEN(n) \
