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| author | Guo Ren <guoren@linux.alibaba.com> | 2020-12-24 05:59:57 +0000 |
|---|---|---|
| committer | Guo Ren <guoren@linux.alibaba.com> | 2021-01-12 09:52:41 +0800 |
| commit | 3b756ccddb8a75563900cd603c83160b43f3d691 (patch) | |
| tree | af6428140af2760616d577a0b1e515a45b58207c /arch/csky/abiv2 | |
| parent | c109f42450ec25283169dd6c0acce8d053493732 (diff) | |
| download | linux-3b756ccddb8a75563900cd603c83160b43f3d691.tar.bz2 | |
csky: Fix TLB maintenance synchronization problem
TLB invalidate didn't contain a barrier operation in csky cpu and
we need to prevent previous PTW response after TLB invalidation
instruction. Of cause, the ASID changing also needs to take care
of the issue.
CPU0 CPU1
=============== ===============
set_pte
sync_is() -> See the previous set_pte for all harts
tlbi.vas -> Invalidate all harts TLB entry & flush pipeline
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Diffstat (limited to 'arch/csky/abiv2')
| -rw-r--r-- | arch/csky/abiv2/inc/abi/ckmmu.h | 35 |
1 files changed, 30 insertions, 5 deletions
diff --git a/arch/csky/abiv2/inc/abi/ckmmu.h b/arch/csky/abiv2/inc/abi/ckmmu.h index c39b13810550..530d2c7edc85 100644 --- a/arch/csky/abiv2/inc/abi/ckmmu.h +++ b/arch/csky/abiv2/inc/abi/ckmmu.h @@ -78,8 +78,13 @@ static inline void tlb_read(void) static inline void tlb_invalid_all(void) { #ifdef CONFIG_CPU_HAS_TLBI - asm volatile("tlbi.alls\n":::"memory"); sync_is(); + asm volatile( + "tlbi.alls \n" + "sync.i \n" + : + : + : "memory"); #else mtcr("cr<8, 15>", 0x04000000); #endif @@ -88,8 +93,13 @@ static inline void tlb_invalid_all(void) static inline void local_tlb_invalid_all(void) { #ifdef CONFIG_CPU_HAS_TLBI - asm volatile("tlbi.all\n":::"memory"); sync_is(); + asm volatile( + "tlbi.all \n" + "sync.i \n" + : + : + : "memory"); #else tlb_invalid_all(); #endif @@ -100,12 +110,27 @@ static inline void tlb_invalid_indexed(void) mtcr("cr<8, 15>", 0x02000000); } -static inline void setup_pgd(pgd_t *pgd) +#define NOP32 ".long 0x4820c400\n" + +static inline void setup_pgd(pgd_t *pgd, int asid) { #ifdef CONFIG_CPU_HAS_TLBI - mtcr("cr<28, 15>", __pa(pgd) | BIT(0)); + sync_is(); +#else + mb(); +#endif + asm volatile( +#ifdef CONFIG_CPU_HAS_TLBI + "mtcr %1, cr<28, 15> \n" #endif - mtcr("cr<29, 15>", __pa(pgd) | BIT(0)); + "mtcr %1, cr<29, 15> \n" + "mtcr %0, cr< 4, 15> \n" + ".rept 64 \n" + NOP32 + ".endr \n" + : + :"r"(asid), "r"(__pa(pgd) | BIT(0)) + :"memory"); } static inline pgd_t *get_pgd(void) |