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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
151arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm,
152 unsigned long start, unsigned long end)
153{
154 tlb->mm = mm;
155 tlb->fullmm = !(start | (end+1));
156 tlb->start = start;
157 tlb->end = end;
158 tlb->vma = NULL;
159 tlb->max = ARRAY_SIZE(tlb->local);
160 tlb->pages = tlb->local;
161 tlb->nr = 0;
162 __tlb_alloc_page(tlb);
163
164#ifdef CONFIG_HAVE_RCU_TABLE_FREE
165 tlb->batch = NULL;
166#endif
167}
168
169static inline void
170arch_tlb_finish_mmu(struct mmu_gather *tlb,
171 unsigned long start, unsigned long end, bool force)
172{
173 if (force) {
174 tlb->range_start = start;
175 tlb->range_end = end;
176 }
177
178 tlb_flush_mmu(tlb);
179
180
181 check_pgt_cache();
182
183 if (tlb->pages != tlb->local)
184 free_pages((unsigned long)tlb->pages, 0);
185}
186
187
188
189
190static inline void
191tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long addr)
192{
193 tlb_add_flush(tlb, addr);
194}
195
196#define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \
197 tlb_remove_tlb_entry(tlb, ptep, address)
198
199
200
201
202
203static inline void
204tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
205{
206 if (!tlb->fullmm) {
207 flush_cache_range(vma, vma->vm_start, vma->vm_end);
208 tlb->vma = vma;
209 tlb->range_start = TASK_SIZE;
210 tlb->range_end = 0;
211 }
212}
213
214static inline void
215tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
216{
217 if (!tlb->fullmm)
218 tlb_flush(tlb);
219}
220
221static inline bool __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
222{
223 tlb->pages[tlb->nr++] = page;
224 VM_WARN_ON(tlb->nr > tlb->max);
225 if (tlb->nr == tlb->max)
226 return true;
227 return false;
228}
229
230static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
231{
232 if (__tlb_remove_page(tlb, page))
233 tlb_flush_mmu(tlb);
234}
235
236static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
237 struct page *page, int page_size)
238{
239 return __tlb_remove_page(tlb, page);
240}
241
242static inline void tlb_remove_page_size(struct mmu_gather *tlb,
243 struct page *page, int page_size)
244{
245 return tlb_remove_page(tlb, page);
246}
247
248static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
249 unsigned long addr)
250{
251 pgtable_page_dtor(pte);
252
253#ifdef CONFIG_ARM_LPAE
254 tlb_add_flush(tlb, addr);
255#else
256
257
258
259
260 addr &= PMD_MASK;
261 tlb_add_flush(tlb, addr + SZ_1M - PAGE_SIZE);
262 tlb_add_flush(tlb, addr + SZ_1M);
263#endif
264
265 tlb_remove_entry(tlb, pte);
266}
267
268static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
269 unsigned long addr)
270{
271#ifdef CONFIG_ARM_LPAE
272 tlb_add_flush(tlb, addr);
273 tlb_remove_entry(tlb, virt_to_page(pmdp));
274#endif
275}
276
277static inline void
278tlb_remove_pmd_tlb_entry(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr)
279{
280 tlb_add_flush(tlb, addr);
281}
282
283#define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr)
284#define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr)
285#define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp)
286
287#define tlb_migrate_finish(mm) do { } while (0)
288
289#define tlb_remove_check_page_size_change tlb_remove_check_page_size_change
290static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
291 unsigned int page_size)
292{
293}
294
295#endif
296#endif
297