diff options
| author | Guo Ren | 2019-06-18 14:33:32 +0200 |
|---|---|---|
| committer | Guo Ren | 2019-07-19 08:21:36 +0200 |
| commit | 22d55f02b8922a097cd4be1e2f131dfa7ef65901 (patch) | |
| tree | e8e0c0f8c5071343902090aa225fb92bd5747536 /arch/csky/include | |
| parent | csky: Add new asid lib code from arm (diff) | |
| download | kernel-qcow2-linux-22d55f02b8922a097cd4be1e2f131dfa7ef65901.tar.gz kernel-qcow2-linux-22d55f02b8922a097cd4be1e2f131dfa7ef65901.tar.xz kernel-qcow2-linux-22d55f02b8922a097cd4be1e2f131dfa7ef65901.zip | |
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: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/csky/include')
| -rw-r--r-- | arch/csky/include/asm/mmu.h | 1 | ||||
| -rw-r--r-- | arch/csky/include/asm/mmu_context.h | 12 |
2 files changed, 11 insertions, 2 deletions
diff --git a/arch/csky/include/asm/mmu.h b/arch/csky/include/asm/mmu.h index 06f509ae09b0..b382a14ea4ec 100644 --- a/arch/csky/include/asm/mmu.h +++ b/arch/csky/include/asm/mmu.h @@ -5,6 +5,7 @@ #define __ASM_CSKY_MMU_H typedef struct { + atomic64_t asid; void *vdso; } mm_context_t; diff --git a/arch/csky/include/asm/mmu_context.h b/arch/csky/include/asm/mmu_context.h index 86dde481df76..0285b0ad18b6 100644 --- a/arch/csky/include/asm/mmu_context.h +++ b/arch/csky/include/asm/mmu_context.h @@ -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 */ |