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17#ifndef __ASMARM_TLB_H
18#define __ASMARM_TLB_H
19
20#include <asm/cacheflush.h>
21
22#ifndef CONFIG_MMU
23
24#include <linux/pagemap.h>
25
26#define tlb_flush(tlb) ((void) tlb)
27
28#include <asm-generic/tlb.h>
29
30#else
31
32#include <linux/swap.h>
33#include <asm/pgalloc.h>
34#include <asm/tlbflush.h>
35
36#define MMU_GATHER_BUNDLE 8
37
38#ifdef CONFIG_HAVE_RCU_TABLE_FREE
39static inline void __tlb_remove_table(void *_table)
40{
41 free_page_and_swap_cache((struct page *)_table);
42}
43
44struct mmu_table_batch {
45 struct rcu_head rcu;
46 unsigned int nr;
47 void *tables[0];
48};
49
50#define MAX_TABLE_BATCH \
51 ((PAGE_SIZE - sizeof(struct mmu_table_batch)) / sizeof(void *))
52
53extern void tlb_table_flush(struct mmu_gather *tlb);
54extern void tlb_remove_table(struct mmu_gather *tlb, void *table);
55
56#define tlb_remove_entry(tlb, entry) tlb_remove_table(tlb, entry)
57#else
58#define tlb_remove_entry(tlb, entry) tlb_remove_page(tlb, entry)
59#endif
60
61
62
63
64
65struct mmu_gather {
66 struct mm_struct *mm;
67#ifdef CONFIG_HAVE_RCU_TABLE_FREE
68 struct mmu_table_batch *batch;
69 unsigned int need_flush;
70#endif
71 unsigned int fullmm;
72 struct vm_area_struct *vma;
73 unsigned long start, end;
74 unsigned long range_start;
75 unsigned long range_end;
76 unsigned int nr;
77 unsigned int max;
78 struct page **pages;
79 struct page *local[MMU_GATHER_BUNDLE];
80};
81
82DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
83
84
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91
92
93
94
95
96
97static inline void tlb_flush(struct mmu_gather *tlb)
98{
99 if (tlb->fullmm || !tlb->vma)
100 flush_tlb_mm(tlb->mm);
101 else if (tlb->range_end > 0) {
102 flush_tlb_range(tlb->vma, tlb->range_start, tlb->range_end);
103 tlb->range_start = TASK_SIZE;
104 tlb->range_end = 0;
105 }
106}
107
108static inline void tlb_add_flush(struct mmu_gather *tlb, unsigned long addr)
109{
110 if (!tlb->fullmm) {
111 if (addr < tlb->range_start)
112 tlb->range_start = addr;
113 if (addr + PAGE_SIZE > tlb->range_end)
114 tlb->range_end = addr + PAGE_SIZE;
115 }
116}
117
118static inline void __tlb_alloc_page(struct mmu_gather *tlb)
119{
120 unsigned long addr = __get_free_pages(GFP_NOWAIT | __GFP_NOWARN, 0);
121
122 if (addr) {
123 tlb->pages = (void *)addr;
124 tlb->max = PAGE_SIZE / sizeof(struct page *);
125 }
126}
127
128static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
129{
130 tlb_flush(tlb);
131#ifdef CONFIG_HAVE_RCU_TABLE_FREE
132 tlb_table_flush(tlb);
133#endif
134}
135
136static inline void tlb_flush_mmu_free(struct mmu_gather *tlb)
137{
138 free_pages_and_swap_cache(tlb->pages, tlb->nr);
139 tlb->nr = 0;
140 if (tlb->pages == tlb->local)
141 __tlb_alloc_page(tlb);
142}
143
144static inline void tlb_flush_mmu(struct mmu_gather *tlb)
145{
146 tlb_flush_mmu_tlbonly(tlb);
147 tlb_flush_mmu_free(tlb);
148}
149
150static inline void
151tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned long start, unsigned long end)
152{
153 tlb->mm = mm;
154 tlb->fullmm = !(start | (end+1));
155 tlb->start = start;
156 tlb->end = end;
157 tlb->vma = NULL;
158 tlb->max = ARRAY_SIZE(tlb->local);
159 tlb->pages = tlb->local;
160 tlb->nr = 0;
161 __tlb_alloc_page(tlb);
162
163#ifdef CONFIG_HAVE_RCU_TABLE_FREE
164 tlb->batch = NULL;
165#endif
166}
167
168static inline void
169tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
170{
171 tlb_flush_mmu(tlb);
172
173
174 check_pgt_cache();
175
176 if (tlb->pages != tlb->local)
177 free_pages((unsigned long)tlb->pages, 0);
178}
179
180
181
182
183static inline void
184tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long addr)
185{
186 tlb_add_flush(tlb, addr);
187}
188
189
190
191
192
193
194static inline void
195tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
196{
197 if (!tlb->fullmm) {
198 flush_cache_range(vma, vma->vm_start, vma->vm_end);
199 tlb->vma = vma;
200 tlb->range_start = TASK_SIZE;
201 tlb->range_end = 0;
202 }
203}
204
205static inline void
206tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
207{
208 if (!tlb->fullmm)
209 tlb_flush(tlb);
210}
211
212static inline bool __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
213{
214 if (tlb->nr == tlb->max)
215 return true;
216 tlb->pages[tlb->nr++] = page;
217 return false;
218}
219
220static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
221{
222 if (__tlb_remove_page(tlb, page)) {
223 tlb_flush_mmu(tlb);
224 __tlb_remove_page(tlb, page);
225 }
226}
227
228static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
229 struct page *page, int page_size)
230{
231 return __tlb_remove_page(tlb, page);
232}
233
234static inline bool __tlb_remove_pte_page(struct mmu_gather *tlb,
235 struct page *page)
236{
237 return __tlb_remove_page(tlb, page);
238}
239
240static inline void tlb_remove_page_size(struct mmu_gather *tlb,
241 struct page *page, int page_size)
242{
243 return tlb_remove_page(tlb, page);
244}
245
246static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
247 unsigned long addr)
248{
249 pgtable_page_dtor(pte);
250
251#ifdef CONFIG_ARM_LPAE
252 tlb_add_flush(tlb, addr);
253#else
254
255
256
257
258 addr &= PMD_MASK;
259 tlb_add_flush(tlb, addr + SZ_1M - PAGE_SIZE);
260 tlb_add_flush(tlb, addr + SZ_1M);
261#endif
262
263 tlb_remove_entry(tlb, pte);
264}
265
266static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
267 unsigned long addr)
268{
269#ifdef CONFIG_ARM_LPAE
270 tlb_add_flush(tlb, addr);
271 tlb_remove_entry(tlb, virt_to_page(pmdp));
272#endif
273}
274
275static inline void
276tlb_remove_pmd_tlb_entry(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr)
277{
278 tlb_add_flush(tlb, addr);
279}
280
281#define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr)
282#define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr)
283#define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp)
284
285#define tlb_migrate_finish(mm) do { } while (0)
286
287#endif
288#endif
289