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Commit 22d55f02 authored by Guo Ren's avatar Guo Ren
Browse files

csky: Use generic asid algorithm to implement switch_mm 



Use linux generic asid/vmid algorithm to implement csky
switch_mm function. The algorithm is from arm and it could
work with SMP system. It'll help reduce tlb flush for
switch_mm in task/vm switch.

Signed-off-by: default avatarGuo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>
parent a231b883

arch/csky/abiv1/inc/abi/ckmmu.h

+6 −0
Original line number Diff line number Diff line
@@ -78,6 +78,12 @@ static inline void tlb_invalid_all(void) 
	cpwcr("cpcr8", 0x04000000);

}





static inline void local_tlb_invalid_all(void)

{

	tlb_invalid_all();

}



static inline void tlb_invalid_indexed(void)

{

	cpwcr("cpcr8", 0x02000000);

arch/csky/abiv2/inc/abi/ckmmu.h

+10 −0
Original line number Diff line number Diff line
@@ -85,6 +85,16 @@ static inline void tlb_invalid_all(void) 
#endif

}



static inline void local_tlb_invalid_all(void)

{

#ifdef CONFIG_CPU_HAS_TLBI

	asm volatile("tlbi.all\n":::"memory");

	sync_is();

#else

	tlb_invalid_all();

#endif

}



static inline void tlb_invalid_indexed(void)

{

	mtcr("cr<8, 15>", 0x02000000);

arch/csky/include/asm/mmu.h

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
#define __ASM_CSKY_MMU_H



typedef struct {

	atomic64_t	asid;

	void *vdso;

} mm_context_t;

arch/csky/include/asm/mmu_context.h

+10 −2
Original line number Diff line number Diff line
@@ -20,20 +20,28 @@ 
#define TLBMISS_HANDLER_SETUP_PGD_KERNEL(pgd) \

	setup_pgd(__pa(pgd), true)



#define init_new_context(tsk,mm)	0

#define ASID_MASK		((1 << CONFIG_CPU_ASID_BITS) - 1)

#define cpu_asid(mm)		(atomic64_read(&mm->context.asid) & ASID_MASK)



#define init_new_context(tsk,mm)	({ atomic64_set(&(mm)->context.asid, 0); 0; })

#define activate_mm(prev,next)		switch_mm(prev, next, current)



#define destroy_context(mm)		do {} while (0)

#define enter_lazy_tlb(mm, tsk)		do {} while (0)

#define deactivate_mm(tsk, mm)		do {} while (0)



void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);



static inline void

switch_mm(struct mm_struct *prev, struct mm_struct *next,

	  struct task_struct *tsk)

{

	unsigned int cpu = smp_processor_id();



	if (prev != next)

		tlb_invalid_all();

		check_and_switch_context(next, cpu);



	TLBMISS_HANDLER_SETUP_PGD(next->pgd);

	write_mmu_entryhi(next->context.asid.counter);

}

#endif /* __ASM_CSKY_MMU_CONTEXT_H */

arch/csky/mm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -13,3 +13,4 @@ obj-y += ioremap.o 
obj-y +=			syscache.o

obj-y +=			tlb.o

obj-y +=			asid.o

obj-y +=			context.o