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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-01-30 23:08:37 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-02-09 00:02:12 +1100 |
| commit | 25b7e6bb743ca5a375bb89522a2c2bec840d5fc3 (patch) | |
| tree | fe08dd1447849d44c45f37ca1c255196407bb387 | |
| parent | 8d41fc618ab804657acd2df8e761ce1001f41513 (diff) | |
| download | cachepc-linux-25b7e6bb743ca5a375bb89522a2c2bec840d5fc3.tar.gz cachepc-linux-25b7e6bb743ca5a375bb89522a2c2bec840d5fc3.zip | |
powerpc: add interrupt wrapper entry / exit stub functions
These will be used by subsequent patches.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210130130852.2952424-28-npiggin@gmail.com
| -rw-r--r-- | arch/powerpc/include/asm/interrupt.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h index 5e2526aacc52..3df1921cfda3 100644 --- a/arch/powerpc/include/asm/interrupt.h +++ b/arch/powerpc/include/asm/interrupt.h @@ -5,6 +5,50 @@ #include <linux/context_tracking.h> #include <asm/ftrace.h> +struct interrupt_state { +}; + +static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrupt_state *state) +{ +} + +/* + * Care should be taken to note that interrupt_exit_prepare and + * interrupt_async_exit_prepare do not necessarily return immediately to + * regs context (e.g., if regs is usermode, we don't necessarily return to + * user mode). Other interrupts might be taken between here and return, + * context switch / preemption may occur in the exit path after this, or a + * signal may be delivered, etc. + * + * The real interrupt exit code is platform specific, e.g., + * interrupt_exit_user_prepare / interrupt_exit_kernel_prepare for 64s. + * + * However interrupt_nmi_exit_prepare does return directly to regs, because + * NMIs do not do "exit work" or replay soft-masked interrupts. + */ +static inline void interrupt_exit_prepare(struct pt_regs *regs, struct interrupt_state *state) +{ +} + +static inline void interrupt_async_enter_prepare(struct pt_regs *regs, struct interrupt_state *state) +{ +} + +static inline void interrupt_async_exit_prepare(struct pt_regs *regs, struct interrupt_state *state) +{ +} + +struct interrupt_nmi_state { +}; + +static inline void interrupt_nmi_enter_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state) +{ +} + +static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state) +{ +} + /** * DECLARE_INTERRUPT_HANDLER_RAW - Declare raw interrupt handler function * @func: Function name of the entry point @@ -71,7 +115,13 @@ static __always_inline void ____##func(struct pt_regs *regs); \ \ __visible noinstr void func(struct pt_regs *regs) \ { \ + struct interrupt_state state; \ + \ + interrupt_enter_prepare(regs, &state); \ + \ ____##func (regs); \ + \ + interrupt_exit_prepare(regs, &state); \ } \ \ static __always_inline void ____##func(struct pt_regs *regs) @@ -99,10 +149,15 @@ static __always_inline long ____##func(struct pt_regs *regs); \ \ __visible noinstr long func(struct pt_regs *regs) \ { \ + struct interrupt_state state; \ long ret; \ \ + interrupt_enter_prepare(regs, &state); \ + \ ret = ____##func (regs); \ \ + interrupt_exit_prepare(regs, &state); \ + \ return ret; \ } \ \ @@ -129,7 +184,13 @@ static __always_inline void ____##func(struct pt_regs *regs); \ \ __visible noinstr void func(struct pt_regs *regs) \ { \ + struct interrupt_state state; \ + \ + interrupt_async_enter_prepare(regs, &state); \ + \ ____##func (regs); \ + \ + interrupt_async_exit_prepare(regs, &state); \ } \ \ static __always_inline void ____##func(struct pt_regs *regs) @@ -157,10 +218,15 @@ static __always_inline long ____##func(struct pt_regs *regs); \ \ __visible noinstr long func(struct pt_regs *regs) \ { \ + struct interrupt_nmi_state state; \ long ret; \ \ + interrupt_nmi_enter_prepare(regs, &state); \ + \ ret = ____##func (regs); \ \ + interrupt_nmi_exit_prepare(regs, &state); \ + \ return ret; \ } \ \ |