blob: 5240fa1c5e0860debec1fcf56daf1e3db30970ec [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __UM_TLB_H
2#define __UM_TLB_H
3
WANG Cong1f4deba2008-04-15 14:34:38 -07004#include <linux/pagemap.h>
Jeff Dike0b4e2732008-02-04 22:31:07 -08005#include <linux/swap.h>
6#include <asm/percpu.h>
7#include <asm/pgalloc.h>
8#include <asm/tlbflush.h>
9
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)
13
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.
16 */
17struct 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 */
23};
24
25/* Users of the generic TLB shootdown code must declare this storage space. */
26DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
27
28static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
29 unsigned long address)
30{
31 if (tlb->start > address)
32 tlb->start = address;
33 if (tlb->end < address + PAGE_SIZE)
34 tlb->end = address + PAGE_SIZE;
35}
36
37static inline void init_tlb_gather(struct mmu_gather *tlb)
38{
39 tlb->need_flush = 0;
40
41 tlb->start = TASK_SIZE;
42 tlb->end = 0;
43
44 if (tlb->fullmm) {
45 tlb->start = 0;
46 tlb->end = TASK_SIZE;
47 }
48}
49
50/* tlb_gather_mmu
51 * Return a pointer to an initialized struct mmu_gather.
52 */
53static inline struct mmu_gather *
54tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
55{
56 struct mmu_gather *tlb = &get_cpu_var(mmu_gathers);
57
58 tlb->mm = mm;
59 tlb->fullmm = full_mm_flush;
60
61 init_tlb_gather(tlb);
62
63 return tlb;
64}
65
66extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
67 unsigned long end);
68
69static inline void
70tlb_flush_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
71{
72 if (!tlb->need_flush)
73 return;
74
75 flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end);
76 init_tlb_gather(tlb);
77}
78
79/* tlb_finish_mmu
80 * Called at the end of the shootdown operation to free up any resources
81 * that were required.
82 */
83static inline void
84tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
85{
86 tlb_flush_mmu(tlb, start, end);
87
88 /* keep the page table cache within bounds */
89 check_pgt_cache();
90
91 put_cpu_var(mmu_gathers);
92}
93
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.
98 */
99static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
100{
101 tlb->need_flush = 1;
102 free_page_and_swap_cache(page);
103 return;
104}
105
106/**
107 * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation.
108 *
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.
112 */
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)
118
119#define pte_free_tlb(tlb, ptep) __pte_free_tlb(tlb, ptep)
120
121#define pud_free_tlb(tlb, pudp) __pud_free_tlb(tlb, pudp)
122
123#define pmd_free_tlb(tlb, pmdp) __pmd_free_tlb(tlb, pmdp)
124
125#define tlb_migrate_finish(mm) do {} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
127#endif