Commit 25b7e6bb authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

powerpc: add interrupt wrapper entry / exit stub functions 



These will be used by subsequent patches.

Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210130130852.2952424-28-npiggin@gmail.com
parent 8d41fc61

arch/powerpc/include/asm/interrupt.h

+66 −0
Original line number Diff line number Diff line
@@ -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;							\

}									\

									\