#ifndef __UM_TLB_H #define __UM_TLB_H #include <linux/pagemap.h> #include <linux/swap.h> #include <asm/percpu.h> #include <asm/pgalloc.h> #include <asm/tlbflush.h> #define tlb_start_vma(tlb, vma) do { } while (0) #define tlb_end_vma(tlb, vma) do { } while (0) #define tlb_flush(tlb) flush_tlb_mm((tlb)->mm) /* struct mmu_gather is an opaque type used by the mm code for passing around * any data needed by arch specific code for tlb_remove_page. */ struct mmu_gather { struct mm_struct *mm; unsigned int need_flush; /* Really unmapped some ptes? */ unsigned long start; unsigned long end; unsigned int fullmm; /* non-zero means full mm flush */ }; /* Users of the generic TLB shootdown code must declare this storage space. */ DECLARE_PER_CPU(struct mmu_gather, 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; } static inline void init_tlb_gather(struct mmu_gather *tlb) { tlb->need_flush = 0; tlb->start = TASK_SIZE; tlb->end = 0; if (tlb->fullmm) { tlb->start = 0; tlb->end = TASK_SIZE; } } /* tlb_gather_mmu * Return a pointer to an initialized struct mmu_gather. */ 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; } extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, unsigned long end); static inline void tlb_flush_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) { if (!tlb->need_flush) return; flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end); init_tlb_gather(tlb); } /* tlb_finish_mmu * Called at the end of the shootdown operation to free up any resources * that were required. */ static inline void tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) { tlb_flush_mmu(tlb, start, end); /* keep the page table cache within bounds */ check_pgt_cache(); put_cpu_var(mmu_gathers); } /* tlb_remove_page * Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)), * while handling the additional races in SMP caused by other CPUs * caching valid mappings in their TLBs. */ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) { tlb->need_flush = 1; free_page_and_swap_cache(page); return; } /** * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation. * * Record the fact that pte's were really umapped in ->need_flush, so we can * later optimise away the tlb invalidate. This helps when userspace is * unmapping already-unmapped pages, which happens quite a lot. */ #define tlb_remove_tlb_entry(tlb, ptep, address) \ do { \ tlb->need_flush = 1; \ __tlb_remove_tlb_entry(tlb, ptep, address); \ } while (0) #define pte_free_tlb(tlb, ptep) __pte_free_tlb(tlb, ptep) #define pud_free_tlb(tlb, pudp) __pud_free_tlb(tlb, pudp) #define pmd_free_tlb(tlb, pmdp) __pmd_free_tlb(tlb, pmdp) #define tlb_migrate_finish(mm) do {} while (0) #endif