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powerpc/64e/interrupt: NMI save irq soft-mask state in C
64e non-maskable interrupts save the state of the irq soft-mask in asm. This can be done in C in interrupt wrappers as 64s does. I haven't been able to test this with qemu because it doesn't seem to cause FSL bookE WDT interrupts. This makes WatchdogException an NMI interrupt, which affects 32-bit as well (okay, or create a new handler?) Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210316104206.407354-6-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin
Michael Ellerman
parent
0c2472de23
commit
3db8aa10de
3 changed files with 38 additions and 43 deletions
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@ -149,18 +149,32 @@ static inline void interrupt_async_exit_prepare(struct pt_regs *regs, struct int
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struct interrupt_nmi_state {
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#ifdef CONFIG_PPC64
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#ifdef CONFIG_PPC_BOOK3S_64
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u8 irq_soft_mask;
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u8 irq_happened;
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#endif
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u8 ftrace_enabled;
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#endif
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};
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static inline bool nmi_disables_ftrace(struct pt_regs *regs)
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{
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/* Allow DEC and PMI to be traced when they are soft-NMI */
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if (IS_ENABLED(CONFIG_PPC_BOOK3S_64)) {
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if (TRAP(regs) == 0x900)
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return false;
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if (TRAP(regs) == 0xf00)
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return false;
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}
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if (IS_ENABLED(CONFIG_PPC_BOOK3E)) {
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if (TRAP(regs) == 0x260)
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return false;
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}
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return true;
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}
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static inline void interrupt_nmi_enter_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state)
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{
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#ifdef CONFIG_PPC64
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#ifdef CONFIG_PPC_BOOK3S_64
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state->irq_soft_mask = local_paca->irq_soft_mask;
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state->irq_happened = local_paca->irq_happened;
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@ -173,9 +187,8 @@ static inline void interrupt_nmi_enter_prepare(struct pt_regs *regs, struct inte
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local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
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/* Don't do any per-CPU operations until interrupt state is fixed */
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#endif
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/* Allow DEC and PMI to be traced when they are soft-NMI */
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if (TRAP(regs) != 0x900 && TRAP(regs) != 0xf00 && TRAP(regs) != 0x260) {
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if (nmi_disables_ftrace(regs)) {
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state->ftrace_enabled = this_cpu_get_ftrace_enabled();
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this_cpu_set_ftrace_enabled(0);
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}
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@ -204,16 +217,14 @@ static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct inter
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*/
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#ifdef CONFIG_PPC64
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if (TRAP(regs) != 0x900 && TRAP(regs) != 0xf00 && TRAP(regs) != 0x260)
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if (nmi_disables_ftrace(regs))
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this_cpu_set_ftrace_enabled(state->ftrace_enabled);
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#ifdef CONFIG_PPC_BOOK3S_64
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/* Check we didn't change the pending interrupt mask. */
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WARN_ON_ONCE((state->irq_happened | PACA_IRQ_HARD_DIS) != local_paca->irq_happened);
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local_paca->irq_happened = state->irq_happened;
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local_paca->irq_soft_mask = state->irq_soft_mask;
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#endif
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#endif
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}
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/*
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@ -426,6 +437,7 @@ DECLARE_INTERRUPT_HANDLER(SMIException);
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DECLARE_INTERRUPT_HANDLER(handle_hmi_exception);
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DECLARE_INTERRUPT_HANDLER(unknown_exception);
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DECLARE_INTERRUPT_HANDLER_ASYNC(unknown_async_exception);
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DECLARE_INTERRUPT_HANDLER_NMI(unknown_nmi_exception);
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DECLARE_INTERRUPT_HANDLER(instruction_breakpoint_exception);
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DECLARE_INTERRUPT_HANDLER(RunModeException);
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DECLARE_INTERRUPT_HANDLER(single_step_exception);
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@ -449,7 +461,7 @@ DECLARE_INTERRUPT_HANDLER(altivec_assist_exception);
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DECLARE_INTERRUPT_HANDLER(CacheLockingException);
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DECLARE_INTERRUPT_HANDLER(SPEFloatingPointException);
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DECLARE_INTERRUPT_HANDLER(SPEFloatingPointRoundException);
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DECLARE_INTERRUPT_HANDLER(WatchdogException);
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DECLARE_INTERRUPT_HANDLER_NMI(WatchdogException);
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DECLARE_INTERRUPT_HANDLER(kernel_bad_stack);
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/* slb.c */
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@ -63,9 +63,6 @@
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ld reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1)
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special_reg_save:
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lbz r9,PACAIRQHAPPENED(r13)
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RECONCILE_IRQ_STATE(r3,r4)
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/*
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* We only need (or have stack space) to save this stuff if
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* we interrupted the kernel.
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@ -119,15 +116,11 @@ BEGIN_FTR_SECTION
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mtspr SPRN_MAS5,r10
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mtspr SPRN_MAS8,r10
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END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
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SPECIAL_EXC_STORE(r9,IRQHAPPENED)
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mfspr r10,SPRN_DEAR
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SPECIAL_EXC_STORE(r10,DEAR)
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mfspr r10,SPRN_ESR
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SPECIAL_EXC_STORE(r10,ESR)
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lbz r10,PACAIRQSOFTMASK(r13)
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SPECIAL_EXC_STORE(r10,SOFTE)
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ld r10,_NIP(r1)
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SPECIAL_EXC_STORE(r10,CSRR0)
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ld r10,_MSR(r1)
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@ -194,27 +187,6 @@ BEGIN_FTR_SECTION
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mtspr SPRN_MAS8,r10
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END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
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lbz r6,PACAIRQSOFTMASK(r13)
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ld r5,SOFTE(r1)
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/* Interrupts had better not already be enabled... */
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tweqi r6,IRQS_ENABLED
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andi. r6,r5,IRQS_DISABLED
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bne 1f
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TRACE_ENABLE_INTS
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stb r5,PACAIRQSOFTMASK(r13)
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1:
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/*
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* Restore PACAIRQHAPPENED rather than setting it based on
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* the return MSR[EE], since we could have interrupted
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* interrupt replay or other inconsistent transitory
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* states that must remain that way.
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*/
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SPECIAL_EXC_LOAD(r10,IRQHAPPENED)
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stb r10,PACAIRQHAPPENED(r13)
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SPECIAL_EXC_LOAD(r10,DEAR)
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mtspr SPRN_DEAR,r10
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SPECIAL_EXC_LOAD(r10,ESR)
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@ -566,7 +538,7 @@ __end_interrupts:
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bl special_reg_save
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CHECK_NAPPING();
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addi r3,r1,STACK_FRAME_OVERHEAD
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bl unknown_exception
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bl unknown_nmi_exception
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b ret_from_crit_except
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/* Machine Check Interrupt */
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@ -702,7 +674,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
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#ifdef CONFIG_BOOKE_WDT
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bl WatchdogException
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#else
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bl unknown_exception
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bl unknown_nmi_exception
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#endif
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b ret_from_crit_except
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@ -886,7 +858,7 @@ kernel_dbg_exc:
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bl special_reg_save
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CHECK_NAPPING();
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addi r3,r1,STACK_FRAME_OVERHEAD
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bl unknown_exception
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bl unknown_nmi_exception
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b ret_from_crit_except
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/*
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@ -910,7 +882,7 @@ kernel_dbg_exc:
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bl special_reg_save
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CHECK_NAPPING();
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addi r3,r1,STACK_FRAME_OVERHEAD
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bl unknown_exception
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bl unknown_nmi_exception
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b ret_from_crit_except
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/* Hypervisor call */
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@ -1078,6 +1078,16 @@ DEFINE_INTERRUPT_HANDLER_ASYNC(unknown_async_exception)
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_exception(SIGTRAP, regs, TRAP_UNK, 0);
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}
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DEFINE_INTERRUPT_HANDLER_NMI(unknown_nmi_exception)
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{
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printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
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regs->nip, regs->msr, regs->trap);
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_exception(SIGTRAP, regs, TRAP_UNK, 0);
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return 0;
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}
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DEFINE_INTERRUPT_HANDLER(instruction_breakpoint_exception)
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{
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if (notify_die(DIE_IABR_MATCH, "iabr_match", regs, 5,
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@ -2181,10 +2191,11 @@ void __attribute__ ((weak)) WatchdogHandler(struct pt_regs *regs)
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return;
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}
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DEFINE_INTERRUPT_HANDLER(WatchdogException) /* XXX NMI? async? */
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DEFINE_INTERRUPT_HANDLER_NMI(WatchdogException)
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{
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printk (KERN_EMERG "PowerPC Book-E Watchdog Exception\n");
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WatchdogHandler(regs);
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return 0;
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}
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#endif
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