diff options
| -rw-r--r-- | arch/powerpc/include/asm/hw_irq.h | 10 | ||||
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 8 | ||||
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64e.S | 4 | ||||
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 5 | ||||
| -rw-r--r-- | arch/powerpc/kernel/idle_book3e.S | 7 | ||||
| -rw-r--r-- | arch/powerpc/kernel/irq.c | 34 |
6 files changed, 52 insertions, 16 deletions
diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h index e151774cb577..32a18f2f49bc 100644 --- a/arch/powerpc/include/asm/hw_irq.h +++ b/arch/powerpc/include/asm/hw_irq.h @@ -253,14 +253,16 @@ static inline bool lazy_irq_pending(void) /* * This is called by asynchronous interrupts to conditionally - * re-enable hard interrupts when soft-disabled after having - * cleared the source of the interrupt + * re-enable hard interrupts after having cleared the source + * of the interrupt. They are kept disabled if there is a different + * soft-masked interrupt pending that requires hard masking. */ static inline void may_hard_irq_enable(void) { - get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS; - if (!(get_paca()->irq_happened & PACA_IRQ_MUST_HARD_MASK)) + if (!(get_paca()->irq_happened & PACA_IRQ_MUST_HARD_MASK)) { + get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS; __hard_irq_enable(); + } } static inline bool arch_irq_disabled_regs(struct pt_regs *regs) diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 729e9ef4d3bb..0357f87a013c 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -993,6 +993,14 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) std r4,_TRAP(r1) /* + * PACA_IRQ_HARD_DIS won't always be set here, so set it now + * to reconcile the IRQ state. Tracing is already accounted for. + */ + lbz r4,PACAIRQHAPPENED(r13) + ori r4,r4,PACA_IRQ_HARD_DIS + stb r4,PACAIRQHAPPENED(r13) + + /* * Then find the right handler and call it. Interrupts are * still soft-disabled and we keep them that way. */ diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S index 9b6e653e501a..3325f721e7b2 100644 --- a/arch/powerpc/kernel/exceptions-64e.S +++ b/arch/powerpc/kernel/exceptions-64e.S @@ -949,7 +949,11 @@ kernel_dbg_exc: .macro masked_interrupt_book3e paca_irq full_mask lbz r10,PACAIRQHAPPENED(r13) + .if \full_mask == 1 + ori r10,r10,\paca_irq | PACA_IRQ_HARD_DIS + .else ori r10,r10,\paca_irq + .endif stb r10,PACAIRQHAPPENED(r13) .if \full_mask == 1 diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 76a14702cb9c..36aec1f1cb2d 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -1498,7 +1498,10 @@ masked_##_H##interrupt: \ mfspr r10,SPRN_##_H##SRR1; \ xori r10,r10,MSR_EE; /* clear MSR_EE */ \ mtspr SPRN_##_H##SRR1,r10; \ -2: mtcrf 0x80,r9; \ + ori r11,r11,PACA_IRQ_HARD_DIS; \ + stb r11,PACAIRQHAPPENED(r13); \ +2: /* done */ \ + mtcrf 0x80,r9; \ std r1,PACAR1(r13); \ ld r9,PACA_EXGEN+EX_R9(r13); \ ld r10,PACA_EXGEN+EX_R10(r13); \ diff --git a/arch/powerpc/kernel/idle_book3e.S b/arch/powerpc/kernel/idle_book3e.S index 2b269315d377..4e0d94d02030 100644 --- a/arch/powerpc/kernel/idle_book3e.S +++ b/arch/powerpc/kernel/idle_book3e.S @@ -36,7 +36,7 @@ _GLOBAL(\name) */ lbz r3,PACAIRQHAPPENED(r13) cmpwi cr0,r3,0 - bnelr + bne 2f /* Now we are going to mark ourselves as soft and hard enabled in * order to be able to take interrupts while asleep. We inform lockdep @@ -72,6 +72,11 @@ _GLOBAL(\name) wrteei 1 \loop +2: + lbz r10,PACAIRQHAPPENED(r13) + ori r10,r10,PACA_IRQ_HARD_DIS + stb r10,PACAIRQHAPPENED(r13) + blr .endm .macro BOOK3E_IDLE_LOOP diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index 0682fef1f385..ca941f1e83a9 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -145,8 +145,20 @@ notrace unsigned int __check_irq_replay(void) trace_hardirqs_on(); trace_hardirqs_off(); + /* + * We are always hard disabled here, but PACA_IRQ_HARD_DIS may + * not be set, which means interrupts have only just been hard + * disabled as part of the local_irq_restore or interrupt return + * code. In that case, skip the decrementr check becaus it's + * expensive to read the TB. + * + * HARD_DIS then gets cleared here, but it's reconciled later. + * Either local_irq_disable will replay the interrupt and that + * will reconcile state like other hard interrupts. Or interrupt + * retur will replay the interrupt and in that case it sets + * PACA_IRQ_HARD_DIS by hand (see comments in entry_64.S). + */ if (happened & PACA_IRQ_HARD_DIS) { - /* Clear bit 0 which we wouldn't clear otherwise */ local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS; /* @@ -248,24 +260,26 @@ notrace void arch_local_irq_restore(unsigned long mask) * cannot have preempted. */ irq_happened = get_irq_happened(); - if (!irq_happened) + if (!irq_happened) { +#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG + WARN_ON(!(mfmsr() & MSR_EE)); +#endif return; + } /* * We need to hard disable to get a trusted value from * __check_irq_replay(). We also need to soft-disable * again to avoid warnings in there due to the use of * per-cpu variables. - * - * We know that if the value in irq_happened is exactly 0x01 - * then we are already hard disabled (there are other less - * common cases that we'll ignore for now), so we skip the - * (expensive) mtmsrd. */ - if (unlikely(irq_happened != PACA_IRQ_HARD_DIS)) + if (!(irq_happened & PACA_IRQ_HARD_DIS)) { +#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG + WARN_ON(!(mfmsr() & MSR_EE)); +#endif __hard_irq_disable(); #ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG - else { + } else { /* * We should already be hard disabled here. We had bugs * where that wasn't the case so let's dbl check it and @@ -274,8 +288,8 @@ notrace void arch_local_irq_restore(unsigned long mask) */ if (WARN_ON(mfmsr() & MSR_EE)) __hard_irq_disable(); - } #endif + } irq_soft_mask_set(IRQS_ALL_DISABLED); trace_hardirqs_off(); |