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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-01-30 14:08:49 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-02-08 14:10:50 +0100 |
| commit | 118178e62e2e0da39b394e812fef7179c8bdb3bc (patch) | |
| tree | 033a3d38b86a4130ed4b2de59bf0d7cf1fc23337 /arch/powerpc/include | |
| parent | powerpc/pseries/mce: restore msr before returning from handler (diff) | |
| download | linux-118178e62e2e0da39b394e812fef7179c8bdb3bc.tar.xz linux-118178e62e2e0da39b394e812fef7179c8bdb3bc.zip | |
powerpc: move NMI entry/exit code into wrapper
This moves the common NMI entry and exit code into the interrupt handler
wrappers.
This changes the behaviour of soft-NMI (watchdog) and HMI interrupts, and
also MCE interrupts on 64e, by adding missing parts of the NMI entry to
them.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210130130852.2952424-40-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/interrupt.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h index ca8e08b18a16..cd819d42573c 100644 --- a/arch/powerpc/include/asm/interrupt.h +++ b/arch/powerpc/include/asm/interrupt.h @@ -94,14 +94,42 @@ static inline void interrupt_async_exit_prepare(struct pt_regs *regs, struct int } struct interrupt_nmi_state { +#ifdef CONFIG_PPC64 + u8 ftrace_enabled; +#endif }; static inline void interrupt_nmi_enter_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state) { +#ifdef CONFIG_PPC64 + /* Allow DEC and PMI to be traced when they are soft-NMI */ + if (TRAP(regs) != 0x900 && TRAP(regs) != 0xf00 && TRAP(regs) != 0x260) { + state->ftrace_enabled = this_cpu_get_ftrace_enabled(); + this_cpu_set_ftrace_enabled(0); + } +#endif + + /* + * Do not use nmi_enter() for pseries hash guest taking a real-mode + * NMI because not everything it touches is within the RMA limit. + */ + if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64) || + !firmware_has_feature(FW_FEATURE_LPAR) || + radix_enabled() || (mfmsr() & MSR_DR)) + nmi_enter(); } static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state) { + if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64) || + !firmware_has_feature(FW_FEATURE_LPAR) || + radix_enabled() || (mfmsr() & MSR_DR)) + nmi_exit(); + +#ifdef CONFIG_PPC64 + if (TRAP(regs) != 0x900 && TRAP(regs) != 0xf00 && TRAP(regs) != 0x260) + this_cpu_set_ftrace_enabled(state->ftrace_enabled); +#endif } /** |