mm-only debug patch...
[mmotm.git] / arch / um / include / asm / tlb.h
blob660caedac9eb70bb3314beb5b1e87a3d3e876bef
1 #ifndef __UM_TLB_H
2 #define __UM_TLB_H
4 #include <linux/pagemap.h>
5 #include <linux/swap.h>
6 #include <asm/percpu.h>
7 #include <asm/pgalloc.h>
8 #include <asm/tlbflush.h>
10 #define tlb_start_vma(tlb, vma) do { } while (0)
11 #define tlb_end_vma(tlb, vma) do { } while (0)
12 #define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
14 /* struct mmu_gather is an opaque type used by the mm code for passing around
15 * any data needed by arch specific code for tlb_remove_page.
17 struct mmu_gather {
18 struct mm_struct *mm;
19 unsigned int need_flush; /* Really unmapped some ptes? */
20 unsigned long start;
21 unsigned long end;
22 unsigned int fullmm; /* non-zero means full mm flush */
25 /* Users of the generic TLB shootdown code must declare this storage space. */
26 DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
28 static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
29 unsigned long address)
31 if (tlb->start > address)
32 tlb->start = address;
33 if (tlb->end < address + PAGE_SIZE)
34 tlb->end = address + PAGE_SIZE;
37 static inline void init_tlb_gather(struct mmu_gather *tlb)
39 tlb->need_flush = 0;
41 tlb->start = TASK_SIZE;
42 tlb->end = 0;
44 if (tlb->fullmm) {
45 tlb->start = 0;
46 tlb->end = TASK_SIZE;
50 /* tlb_gather_mmu
51 * Return a pointer to an initialized struct mmu_gather.
53 static inline struct mmu_gather *
54 tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
56 struct mmu_gather *tlb = &get_cpu_var(mmu_gathers);
58 tlb->mm = mm;
59 tlb->fullmm = full_mm_flush;
61 init_tlb_gather(tlb);
63 return tlb;
66 extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
67 unsigned long end);
69 static inline void
70 tlb_flush_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
72 if (!tlb->need_flush)
73 return;
75 flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end);
76 init_tlb_gather(tlb);
79 /* tlb_finish_mmu
80 * Called at the end of the shootdown operation to free up any resources
81 * that were required.
83 static inline void
84 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
86 tlb_flush_mmu(tlb, start, end);
88 /* keep the page table cache within bounds */
89 check_pgt_cache();
91 put_cpu_var(mmu_gathers);
94 /* tlb_remove_page
95 * Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)),
96 * while handling the additional races in SMP caused by other CPUs
97 * caching valid mappings in their TLBs.
99 static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
101 tlb->need_flush = 1;
102 free_page_and_swap_cache(page);
103 return;
107 * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation.
109 * Record the fact that pte's were really umapped in ->need_flush, so we can
110 * later optimise away the tlb invalidate. This helps when userspace is
111 * unmapping already-unmapped pages, which happens quite a lot.
113 #define tlb_remove_tlb_entry(tlb, ptep, address) \
114 do { \
115 tlb->need_flush = 1; \
116 __tlb_remove_tlb_entry(tlb, ptep, address); \
117 } while (0)
119 #define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr)
121 #define pud_free_tlb(tlb, pudp, addr) __pud_free_tlb(tlb, pudp, addr)
123 #define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr)
125 #define tlb_migrate_finish(mm) do {} while (0)
127 #endif