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csky: Use generic asid algorithm to implement switch_mm

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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: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Guo Ren
2019-06-18 20:33:32 +08:00
parent a231b8839c
commit 22d55f02b8
6 changed files with 74 additions and 2 deletions
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1
arch/csky/include/asm/mmu.h
View File

@@ -5,6 +5,7 @@
#define __ASM_CSKY_MMU_H
typedef struct {
atomic64_t asid;
void *vdso;
} mm_context_t;

12
arch/csky/include/asm/mmu_context.h
View File

@@ -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 */