diff options
Diffstat (limited to 'include/asm-s390/tlb.h')
-rw-r--r-- | include/asm-s390/tlb.h | 49 |
1 files changed, 37 insertions, 12 deletions
diff --git a/include/asm-s390/tlb.h b/include/asm-s390/tlb.h index 985de2b..3d8a96d 100644 --- a/include/asm-s390/tlb.h +++ b/include/asm-s390/tlb.h @@ -38,7 +38,7 @@ struct mmu_gather { struct mm_struct *mm; unsigned int fullmm; unsigned int nr_ptes; - unsigned int nr_pmds; + unsigned int nr_pxds; void *array[TLB_NR_PTRS]; }; @@ -53,7 +53,7 @@ static inline struct mmu_gather *tlb_gather_mmu(struct mm_struct *mm, tlb->fullmm = full_mm_flush || (num_online_cpus() == 1) || (atomic_read(&mm->mm_users) <= 1 && mm == current->active_mm); tlb->nr_ptes = 0; - tlb->nr_pmds = TLB_NR_PTRS; + tlb->nr_pxds = TLB_NR_PTRS; if (tlb->fullmm) __tlb_flush_mm(mm); return tlb; @@ -62,12 +62,13 @@ static inline struct mmu_gather *tlb_gather_mmu(struct mm_struct *mm, static inline void tlb_flush_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) { - if (!tlb->fullmm && (tlb->nr_ptes > 0 || tlb->nr_pmds < TLB_NR_PTRS)) + if (!tlb->fullmm && (tlb->nr_ptes > 0 || tlb->nr_pxds < TLB_NR_PTRS)) __tlb_flush_mm(tlb->mm); while (tlb->nr_ptes > 0) pte_free(tlb->mm, tlb->array[--tlb->nr_ptes]); - while (tlb->nr_pmds < TLB_NR_PTRS) - pmd_free(tlb->mm, (pmd_t *) tlb->array[tlb->nr_pmds++]); + while (tlb->nr_pxds < TLB_NR_PTRS) + /* pgd_free frees the pointer as region or segment table */ + pgd_free(tlb->mm, tlb->array[tlb->nr_pxds++]); } static inline void tlb_finish_mmu(struct mmu_gather *tlb, @@ -95,33 +96,57 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) * pte_free_tlb frees a pte table and clears the CRSTE for the * page table from the tlb. */ -static inline void pte_free_tlb(struct mmu_gather *tlb, struct page *page) +static inline void pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte) { if (!tlb->fullmm) { - tlb->array[tlb->nr_ptes++] = page; - if (tlb->nr_ptes >= tlb->nr_pmds) + tlb->array[tlb->nr_ptes++] = pte; + if (tlb->nr_ptes >= tlb->nr_pxds) tlb_flush_mmu(tlb, 0, 0); } else - pte_free(tlb->mm, page); + pte_free(tlb->mm, pte); } /* * pmd_free_tlb frees a pmd table and clears the CRSTE for the * segment table entry from the tlb. + * If the mm uses a two level page table the single pmd is freed + * as the pgd. pmd_free_tlb checks the asce_limit against 2GB + * to avoid the double free of the pmd in this case. */ static inline void pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd) { #ifdef __s390x__ + if (tlb->mm->context.asce_limit <= (1UL << 31)) + return; if (!tlb->fullmm) { - tlb->array[--tlb->nr_pmds] = (struct page *) pmd; - if (tlb->nr_ptes >= tlb->nr_pmds) + tlb->array[--tlb->nr_pxds] = pmd; + if (tlb->nr_ptes >= tlb->nr_pxds) tlb_flush_mmu(tlb, 0, 0); } else pmd_free(tlb->mm, pmd); #endif } -#define pud_free_tlb(tlb, pud) do { } while (0) +/* + * pud_free_tlb frees a pud table and clears the CRSTE for the + * region third table entry from the tlb. + * If the mm uses a three level page table the single pud is freed + * as the pgd. pud_free_tlb checks the asce_limit against 4TB + * to avoid the double free of the pud in this case. + */ +static inline void pud_free_tlb(struct mmu_gather *tlb, pud_t *pud) +{ +#ifdef __s390x__ + if (tlb->mm->context.asce_limit <= (1UL << 42)) + return; + if (!tlb->fullmm) { + tlb->array[--tlb->nr_pxds] = pud; + if (tlb->nr_ptes >= tlb->nr_pxds) + tlb_flush_mmu(tlb, 0, 0); + } else + pud_free(tlb->mm, pud); +#endif +} #define tlb_start_vma(tlb, vma) do { } while (0) #define tlb_end_vma(tlb, vma) do { } while (0) |