diff options
| -rw-r--r-- | arch/sh/include/asm/tlb.h | 100 |
1 files changed, 92 insertions, 8 deletions
diff --git a/arch/sh/include/asm/tlb.h b/arch/sh/include/asm/tlb.h index 88ff1ae8a6b..9c16f737074 100644 --- a/arch/sh/include/asm/tlb.h +++ b/arch/sh/include/asm/tlb.h @@ -6,22 +6,106 @@ #endif #ifndef __ASSEMBLY__ +#include <linux/pagemap.h> + +#ifdef CONFIG_MMU +#include <asm/pgalloc.h> +#include <asm/tlbflush.h> + +/* + * TLB handling. This allows us to remove pages from the page + * tables, and efficiently handle the TLB issues. + */ +struct mmu_gather { + struct mm_struct *mm; + unsigned int fullmm; + unsigned long start, end; +}; -#define tlb_start_vma(tlb, vma) \ - flush_cache_range(vma, vma->vm_start, vma->vm_end) +DECLARE_PER_CPU(struct mmu_gather, mmu_gathers); -#define tlb_end_vma(tlb, vma) \ - flush_tlb_range(vma, vma->vm_start, vma->vm_end) +static inline void init_tlb_gather(struct mmu_gather *tlb) +{ + tlb->start = TASK_SIZE; + tlb->end = 0; -#define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0) + if (tlb->fullmm) { + tlb->start = 0; + tlb->end = TASK_SIZE; + } +} + +static inline struct mmu_gather * +tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush) +{ + struct mmu_gather *tlb = &get_cpu_var(mmu_gathers); + + tlb->mm = mm; + tlb->fullmm = full_mm_flush; + + init_tlb_gather(tlb); + + return tlb; +} + +static inline void +tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) +{ + if (tlb->fullmm) + flush_tlb_mm(tlb->mm); + + /* keep the page table cache within bounds */ + check_pgt_cache(); + + put_cpu_var(mmu_gathers); +} + +static inline void +tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address) +{ + if (tlb->start > address) + tlb->start = address; + if (tlb->end < address + PAGE_SIZE) + tlb->end = address + PAGE_SIZE; +} /* - * Flush whole TLBs for MM + * In the case of tlb vma handling, we can optimise these away in the + * case where we're doing a full MM flush. When we're doing a munmap, + * the vmas are adjusted to only cover the region to be torn down. */ -#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm) +static inline void +tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) +{ + if (!tlb->fullmm) + flush_cache_range(vma, vma->vm_start, vma->vm_end); +} + +static inline void +tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) +{ + if (!tlb->fullmm && tlb->end) { + flush_tlb_range(vma, tlb->start, tlb->end); + init_tlb_gather(tlb); + } +} + +#define tlb_remove_page(tlb,page) free_page_and_swap_cache(page) +#define pte_free_tlb(tlb, ptep) pte_free((tlb)->mm, ptep) +#define pmd_free_tlb(tlb, pmdp) pmd_free((tlb)->mm, pmdp) +#define pud_free_tlb(tlb, pudp) pud_free((tlb)->mm, pudp) + +#define tlb_migrate_finish(mm) do { } while (0) + +#else /* CONFIG_MMU */ + +#define tlb_start_vma(tlb, vma) do { } while (0) +#define tlb_end_vma(tlb, vma) do { } while (0) +#define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0) +#define tlb_flush(tlb) do { } while (0) -#include <linux/pagemap.h> #include <asm-generic/tlb.h> +#endif /* CONFIG_MMU */ #endif /* __ASSEMBLY__ */ #endif /* __ASM_SH_TLB_H */ |