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Commit fe1952fc authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt
Browse files

powerpc: Rework runlatch code 



This moves the inlines into system.h and changes the runlatch
code to use the thread local flags (non-atomic) rather than
the TIF flags (atomic) to keep track of the latch state.

The code to turn it back on in an asynchronous interrupt is
now simplified and partially inlined.

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 7450f6f0

arch/powerpc/include/asm/exception-64s.h

+27 −23
Original line number Diff line number Diff line
@@ -284,16 +284,30 @@ label##_hv: \ 
	rlwimi	r11,r12,0,MSR_EE;		\

	mtmsrd	r11,1



#define STD_EXCEPTION_COMMON(trap, label, hdlr)		\

#define ADD_NVGPRS				\

	bl	.save_nvgprs



#define RUNLATCH_ON				\

BEGIN_FTR_SECTION				\

	clrrdi	r3,r1,THREAD_SHIFT;		\

	ld	r4,TI_LOCAL_FLAGS(r3);		\

	andi.	r0,r4,_TLF_RUNLATCH;		\

	beql	ppc64_runlatch_on_trampoline;	\

END_FTR_SECTION_IFSET(CPU_FTR_CTRL)



#define EXCEPTION_COMMON(trap, label, hdlr, ret, additions)	\

	.align	7;						\

	.globl label##_common;					\

label##_common:							\

	EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN);		\

	DISABLE_INTS;					\

	bl	.save_nvgprs;				\

	additions;						\

	addi	r3,r1,STACK_FRAME_OVERHEAD;			\

	bl	hdlr;						\

	b	.ret_from_except

	b	ret



#define STD_EXCEPTION_COMMON(trap, label, hdlr)			\

	EXCEPTION_COMMON(trap, label, hdlr, ret_from_except,	\

			 ADD_NVGPRS;DISABLE_INTS)



/*

 * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
@@ -301,18 +315,8 @@ label##_common: \ 
 * (finish nap and runlatch)

 */

#define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr)		  \

	.align	7;					\

	.globl label##_common;				\

label##_common:						\

	EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN);	\

	FINISH_NAP;					\

	DISABLE_INTS;					\

BEGIN_FTR_SECTION					\

	bl	.ppc64_runlatch_on;			\

END_FTR_SECTION_IFSET(CPU_FTR_CTRL)			\

	addi	r3,r1,STACK_FRAME_OVERHEAD;		\

	bl	hdlr;					\

	b	.ret_from_except_lite

	EXCEPTION_COMMON(trap, label, hdlr, ret_from_except_lite, \

			 FINISH_NAP;RUNLATCH_ON;DISABLE_INTS)



/*

 * When the idle code in power4_idle puts the CPU into NAP mode,

arch/powerpc/include/asm/reg.h

+2 −20
Original line number Diff line number Diff line
@@ -1079,30 +1079,12 @@ 


#define proc_trap()	asm volatile("trap")



#ifdef CONFIG_PPC64



extern void ppc64_runlatch_on(void);

extern void __ppc64_runlatch_off(void);



#define ppc64_runlatch_off()					\

	do {							\

		if (cpu_has_feature(CPU_FTR_CTRL) &&		\

		    test_thread_flag(TIF_RUNLATCH))		\

			__ppc64_runlatch_off();			\

	} while (0)

#define __get_SP()	({unsigned long sp; \

			asm volatile("mr %0,1": "=r" (sp)); sp;})



extern unsigned long scom970_read(unsigned int address);

extern void scom970_write(unsigned int address, unsigned long value);



#else

#define ppc64_runlatch_on()

#define ppc64_runlatch_off()



#endif /* CONFIG_PPC64 */



#define __get_SP()	({unsigned long sp; \

			asm volatile("mr %0,1": "=r" (sp)); sp;})



struct pt_regs;



extern void ppc_save_regs(struct pt_regs *regs);

arch/powerpc/include/asm/system.h

+38 −0
Original line number Diff line number Diff line
@@ -550,5 +550,43 @@ extern void reloc_got2(unsigned long); 


extern struct dentry *powerpc_debugfs_root;



#ifdef CONFIG_PPC64



extern void __ppc64_runlatch_on(void);

extern void __ppc64_runlatch_off(void);



/*

 * We manually hard enable-disable, this is called

 * in the idle loop and we don't want to mess up

 * with soft-disable/enable & interrupt replay.

 */

#define ppc64_runlatch_off()					\

	do {							\

		if (cpu_has_feature(CPU_FTR_CTRL) &&		\

		    test_thread_local_flags(_TLF_RUNLATCH)) {	\

			unsigned long msr = mfmsr();		\

			__hard_irq_disable();			\

			__ppc64_runlatch_off();			\

			if (msr & MSR_EE)			\

				__hard_irq_enable();		\

		}      						\

	} while (0)



#define ppc64_runlatch_on()					\

	do {							\

		if (cpu_has_feature(CPU_FTR_CTRL) &&		\

		    !test_thread_local_flags(_TLF_RUNLATCH)) {	\

			unsigned long msr = mfmsr();		\

			__hard_irq_disable();			\

			__ppc64_runlatch_on();			\

			if (msr & MSR_EE)			\

				__hard_irq_enable();		\

		}      						\

	} while (0)

#else

#define ppc64_runlatch_on()

#define ppc64_runlatch_off()

#endif /* CONFIG_PPC64 */



#endif /* __KERNEL__ */

#endif /* _ASM_POWERPC_SYSTEM_H */

arch/powerpc/include/asm/thread_info.h

+8 −1
Original line number Diff line number Diff line
@@ -110,7 +110,6 @@ static inline struct thread_info *current_thread_info(void) 
#define TIF_NOERROR		12	/* Force successful syscall return */

#define TIF_NOTIFY_RESUME	13	/* callback before returning to user */

#define TIF_SYSCALL_TRACEPOINT	15	/* syscall tracepoint instrumentation */

#define TIF_RUNLATCH		16	/* Is the runlatch enabled? */



/* as above, but as bit values */

#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
@@ -141,11 +140,13 @@ static inline struct thread_info *current_thread_info(void) 
#define TLF_SLEEPING		1	/* suspend code enabled SLEEP mode */

#define TLF_RESTORE_SIGMASK	2	/* Restore signal mask in do_signal */

#define TLF_LAZY_MMU		3	/* tlb_batch is active */

#define TLF_RUNLATCH		4	/* Is the runlatch enabled? */



#define _TLF_NAPPING		(1 << TLF_NAPPING)

#define _TLF_SLEEPING		(1 << TLF_SLEEPING)

#define _TLF_RESTORE_SIGMASK	(1 << TLF_RESTORE_SIGMASK)

#define _TLF_LAZY_MMU		(1 << TLF_LAZY_MMU)

#define _TLF_RUNLATCH		(1 << TLF_RUNLATCH)



#ifndef __ASSEMBLY__

#define HAVE_SET_RESTORE_SIGMASK	1
@@ -156,6 +157,12 @@ static inline void set_restore_sigmask(void) 
	set_bit(TIF_SIGPENDING, &ti->flags);

}



static inline bool test_thread_local_flags(unsigned int flags)

{

	struct thread_info *ti = current_thread_info();

	return (ti->local_flags & flags) != 0;

}



#ifdef CONFIG_PPC64

#define is_32bit_task()	(test_thread_flag(TIF_32BIT))

#else

arch/powerpc/kernel/exceptions-64s.S

+3 −0
Original line number Diff line number Diff line
@@ -483,6 +483,9 @@ machine_check_common: 
system_call_entry:

	b	system_call_common



ppc64_runlatch_on_trampoline:

	b	.__ppc64_runlatch_on



/*

 * Here we have detected that the kernel stack pointer is bad.

 * R9 contains the saved CR, r13 points to the paca,