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a2c16d6c HD |
1 | #ifndef _LINUX_SWAPOPS_H |
2 | #define _LINUX_SWAPOPS_H | |
3 | ||
4 | #include <linux/radix-tree.h> | |
187f1882 | 5 | #include <linux/bug.h> |
a2c16d6c | 6 | |
1da177e4 LT |
7 | /* |
8 | * swapcache pages are stored in the swapper_space radix tree. We want to | |
9 | * get good packing density in that tree, so the index should be dense in | |
10 | * the low-order bits. | |
11 | * | |
9b15b817 | 12 | * We arrange the `type' and `offset' fields so that `type' is at the seven |
e83a9596 | 13 | * high-order bits of the swp_entry_t and `offset' is right-aligned in the |
9b15b817 HD |
14 | * remaining bits. Although `type' itself needs only five bits, we allow for |
15 | * shmem/tmpfs to shift it all up a further two bits: see swp_to_radix_entry(). | |
1da177e4 LT |
16 | * |
17 | * swp_entry_t's are *never* stored anywhere in their arch-dependent format. | |
18 | */ | |
9b15b817 HD |
19 | #define SWP_TYPE_SHIFT(e) ((sizeof(e.val) * 8) - \ |
20 | (MAX_SWAPFILES_SHIFT + RADIX_TREE_EXCEPTIONAL_SHIFT)) | |
1da177e4 LT |
21 | #define SWP_OFFSET_MASK(e) ((1UL << SWP_TYPE_SHIFT(e)) - 1) |
22 | ||
23 | /* | |
24 | * Store a type+offset into a swp_entry_t in an arch-independent format | |
25 | */ | |
26 | static inline swp_entry_t swp_entry(unsigned long type, pgoff_t offset) | |
27 | { | |
28 | swp_entry_t ret; | |
29 | ||
30 | ret.val = (type << SWP_TYPE_SHIFT(ret)) | | |
31 | (offset & SWP_OFFSET_MASK(ret)); | |
32 | return ret; | |
33 | } | |
34 | ||
35 | /* | |
36 | * Extract the `type' field from a swp_entry_t. The swp_entry_t is in | |
37 | * arch-independent format | |
38 | */ | |
39 | static inline unsigned swp_type(swp_entry_t entry) | |
40 | { | |
41 | return (entry.val >> SWP_TYPE_SHIFT(entry)); | |
42 | } | |
43 | ||
44 | /* | |
45 | * Extract the `offset' field from a swp_entry_t. The swp_entry_t is in | |
46 | * arch-independent format | |
47 | */ | |
48 | static inline pgoff_t swp_offset(swp_entry_t entry) | |
49 | { | |
50 | return entry.val & SWP_OFFSET_MASK(entry); | |
51 | } | |
52 | ||
880cdf3a | 53 | #ifdef CONFIG_MMU |
698dd4ba MM |
54 | /* check whether a pte points to a swap entry */ |
55 | static inline int is_swap_pte(pte_t pte) | |
56 | { | |
21d9ee3e | 57 | return !pte_none(pte) && !pte_present(pte); |
698dd4ba | 58 | } |
880cdf3a | 59 | #endif |
698dd4ba | 60 | |
1da177e4 LT |
61 | /* |
62 | * Convert the arch-dependent pte representation of a swp_entry_t into an | |
63 | * arch-independent swp_entry_t. | |
64 | */ | |
65 | static inline swp_entry_t pte_to_swp_entry(pte_t pte) | |
66 | { | |
67 | swp_entry_t arch_entry; | |
68 | ||
179ef71c CG |
69 | if (pte_swp_soft_dirty(pte)) |
70 | pte = pte_swp_clear_soft_dirty(pte); | |
1da177e4 LT |
71 | arch_entry = __pte_to_swp_entry(pte); |
72 | return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry)); | |
73 | } | |
74 | ||
75 | /* | |
76 | * Convert the arch-independent representation of a swp_entry_t into the | |
77 | * arch-dependent pte representation. | |
78 | */ | |
79 | static inline pte_t swp_entry_to_pte(swp_entry_t entry) | |
80 | { | |
81 | swp_entry_t arch_entry; | |
82 | ||
83 | arch_entry = __swp_entry(swp_type(entry), swp_offset(entry)); | |
1da177e4 LT |
84 | return __swp_entry_to_pte(arch_entry); |
85 | } | |
0697212a | 86 | |
a2c16d6c HD |
87 | static inline swp_entry_t radix_to_swp_entry(void *arg) |
88 | { | |
89 | swp_entry_t entry; | |
90 | ||
91 | entry.val = (unsigned long)arg >> RADIX_TREE_EXCEPTIONAL_SHIFT; | |
92 | return entry; | |
93 | } | |
94 | ||
95 | static inline void *swp_to_radix_entry(swp_entry_t entry) | |
96 | { | |
97 | unsigned long value; | |
98 | ||
99 | value = entry.val << RADIX_TREE_EXCEPTIONAL_SHIFT; | |
100 | return (void *)(value | RADIX_TREE_EXCEPTIONAL_ENTRY); | |
101 | } | |
102 | ||
5042db43 JG |
103 | #if IS_ENABLED(CONFIG_DEVICE_PRIVATE) |
104 | static inline swp_entry_t make_device_private_entry(struct page *page, bool write) | |
105 | { | |
106 | return swp_entry(write ? SWP_DEVICE_WRITE : SWP_DEVICE_READ, | |
107 | page_to_pfn(page)); | |
108 | } | |
109 | ||
110 | static inline bool is_device_private_entry(swp_entry_t entry) | |
111 | { | |
112 | int type = swp_type(entry); | |
113 | return type == SWP_DEVICE_READ || type == SWP_DEVICE_WRITE; | |
114 | } | |
115 | ||
116 | static inline void make_device_private_entry_read(swp_entry_t *entry) | |
117 | { | |
118 | *entry = swp_entry(SWP_DEVICE_READ, swp_offset(*entry)); | |
119 | } | |
120 | ||
121 | static inline bool is_write_device_private_entry(swp_entry_t entry) | |
122 | { | |
123 | return unlikely(swp_type(entry) == SWP_DEVICE_WRITE); | |
124 | } | |
125 | ||
126 | static inline struct page *device_private_entry_to_page(swp_entry_t entry) | |
127 | { | |
128 | return pfn_to_page(swp_offset(entry)); | |
129 | } | |
130 | ||
131 | int device_private_entry_fault(struct vm_area_struct *vma, | |
132 | unsigned long addr, | |
133 | swp_entry_t entry, | |
134 | unsigned int flags, | |
135 | pmd_t *pmdp); | |
136 | #else /* CONFIG_DEVICE_PRIVATE */ | |
137 | static inline swp_entry_t make_device_private_entry(struct page *page, bool write) | |
138 | { | |
139 | return swp_entry(0, 0); | |
140 | } | |
141 | ||
142 | static inline void make_device_private_entry_read(swp_entry_t *entry) | |
143 | { | |
144 | } | |
145 | ||
146 | static inline bool is_device_private_entry(swp_entry_t entry) | |
147 | { | |
148 | return false; | |
149 | } | |
150 | ||
151 | static inline bool is_write_device_private_entry(swp_entry_t entry) | |
152 | { | |
153 | return false; | |
154 | } | |
155 | ||
156 | static inline struct page *device_private_entry_to_page(swp_entry_t entry) | |
157 | { | |
158 | return NULL; | |
159 | } | |
160 | ||
161 | static inline int device_private_entry_fault(struct vm_area_struct *vma, | |
162 | unsigned long addr, | |
163 | swp_entry_t entry, | |
164 | unsigned int flags, | |
165 | pmd_t *pmdp) | |
166 | { | |
167 | return VM_FAULT_SIGBUS; | |
168 | } | |
169 | #endif /* CONFIG_DEVICE_PRIVATE */ | |
170 | ||
0697212a CL |
171 | #ifdef CONFIG_MIGRATION |
172 | static inline swp_entry_t make_migration_entry(struct page *page, int write) | |
173 | { | |
616b8371 ZY |
174 | BUG_ON(!PageLocked(compound_head(page))); |
175 | ||
0697212a CL |
176 | return swp_entry(write ? SWP_MIGRATION_WRITE : SWP_MIGRATION_READ, |
177 | page_to_pfn(page)); | |
178 | } | |
179 | ||
180 | static inline int is_migration_entry(swp_entry_t entry) | |
181 | { | |
182 | return unlikely(swp_type(entry) == SWP_MIGRATION_READ || | |
183 | swp_type(entry) == SWP_MIGRATION_WRITE); | |
184 | } | |
185 | ||
186 | static inline int is_write_migration_entry(swp_entry_t entry) | |
187 | { | |
188 | return unlikely(swp_type(entry) == SWP_MIGRATION_WRITE); | |
189 | } | |
190 | ||
191 | static inline struct page *migration_entry_to_page(swp_entry_t entry) | |
192 | { | |
193 | struct page *p = pfn_to_page(swp_offset(entry)); | |
194 | /* | |
195 | * Any use of migration entries may only occur while the | |
196 | * corresponding page is locked | |
197 | */ | |
616b8371 | 198 | BUG_ON(!PageLocked(compound_head(p))); |
0697212a CL |
199 | return p; |
200 | } | |
201 | ||
202 | static inline void make_migration_entry_read(swp_entry_t *entry) | |
203 | { | |
204 | *entry = swp_entry(SWP_MIGRATION_READ, swp_offset(*entry)); | |
205 | } | |
206 | ||
e66f17ff NH |
207 | extern void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep, |
208 | spinlock_t *ptl); | |
0697212a CL |
209 | extern void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd, |
210 | unsigned long address); | |
cb900f41 KS |
211 | extern void migration_entry_wait_huge(struct vm_area_struct *vma, |
212 | struct mm_struct *mm, pte_t *pte); | |
0697212a CL |
213 | #else |
214 | ||
215 | #define make_migration_entry(page, write) swp_entry(0, 0) | |
5ec553a9 AM |
216 | static inline int is_migration_entry(swp_entry_t swp) |
217 | { | |
218 | return 0; | |
219 | } | |
616b8371 ZY |
220 | static inline struct page *migration_entry_to_page(swp_entry_t entry) |
221 | { | |
222 | return NULL; | |
223 | } | |
224 | ||
0697212a | 225 | static inline void make_migration_entry_read(swp_entry_t *entryp) { } |
e66f17ff NH |
226 | static inline void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep, |
227 | spinlock_t *ptl) { } | |
0697212a CL |
228 | static inline void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd, |
229 | unsigned long address) { } | |
cb900f41 KS |
230 | static inline void migration_entry_wait_huge(struct vm_area_struct *vma, |
231 | struct mm_struct *mm, pte_t *pte) { } | |
0697212a CL |
232 | static inline int is_write_migration_entry(swp_entry_t entry) |
233 | { | |
234 | return 0; | |
235 | } | |
236 | ||
237 | #endif | |
238 | ||
616b8371 ZY |
239 | struct page_vma_mapped_walk; |
240 | ||
241 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION | |
242 | extern void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw, | |
243 | struct page *page); | |
244 | ||
245 | extern void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, | |
246 | struct page *new); | |
247 | ||
248 | extern void pmd_migration_entry_wait(struct mm_struct *mm, pmd_t *pmd); | |
249 | ||
250 | static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd) | |
251 | { | |
252 | swp_entry_t arch_entry; | |
253 | ||
ab6e3d09 NH |
254 | if (pmd_swp_soft_dirty(pmd)) |
255 | pmd = pmd_swp_clear_soft_dirty(pmd); | |
616b8371 ZY |
256 | arch_entry = __pmd_to_swp_entry(pmd); |
257 | return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry)); | |
258 | } | |
259 | ||
260 | static inline pmd_t swp_entry_to_pmd(swp_entry_t entry) | |
261 | { | |
262 | swp_entry_t arch_entry; | |
263 | ||
264 | arch_entry = __swp_entry(swp_type(entry), swp_offset(entry)); | |
265 | return __swp_entry_to_pmd(arch_entry); | |
266 | } | |
267 | ||
268 | static inline int is_pmd_migration_entry(pmd_t pmd) | |
269 | { | |
270 | return !pmd_present(pmd) && is_migration_entry(pmd_to_swp_entry(pmd)); | |
271 | } | |
272 | #else | |
273 | static inline void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw, | |
274 | struct page *page) | |
275 | { | |
276 | BUILD_BUG(); | |
277 | } | |
278 | ||
279 | static inline void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, | |
280 | struct page *new) | |
281 | { | |
282 | BUILD_BUG(); | |
283 | } | |
284 | ||
285 | static inline void pmd_migration_entry_wait(struct mm_struct *m, pmd_t *p) { } | |
286 | ||
287 | static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd) | |
288 | { | |
289 | return swp_entry(0, 0); | |
290 | } | |
291 | ||
292 | static inline pmd_t swp_entry_to_pmd(swp_entry_t entry) | |
293 | { | |
294 | return __pmd(0); | |
295 | } | |
296 | ||
297 | static inline int is_pmd_migration_entry(pmd_t pmd) | |
298 | { | |
299 | return 0; | |
300 | } | |
301 | #endif | |
302 | ||
a7420aa5 | 303 | #ifdef CONFIG_MEMORY_FAILURE |
8e30456b NH |
304 | |
305 | extern atomic_long_t num_poisoned_pages __read_mostly; | |
306 | ||
a7420aa5 AK |
307 | /* |
308 | * Support for hardware poisoned pages | |
309 | */ | |
310 | static inline swp_entry_t make_hwpoison_entry(struct page *page) | |
311 | { | |
312 | BUG_ON(!PageLocked(page)); | |
313 | return swp_entry(SWP_HWPOISON, page_to_pfn(page)); | |
314 | } | |
315 | ||
316 | static inline int is_hwpoison_entry(swp_entry_t entry) | |
317 | { | |
318 | return swp_type(entry) == SWP_HWPOISON; | |
319 | } | |
8e30456b | 320 | |
da1b13cc WL |
321 | static inline bool test_set_page_hwpoison(struct page *page) |
322 | { | |
323 | return TestSetPageHWPoison(page); | |
324 | } | |
325 | ||
8e30456b NH |
326 | static inline void num_poisoned_pages_inc(void) |
327 | { | |
328 | atomic_long_inc(&num_poisoned_pages); | |
329 | } | |
330 | ||
331 | static inline void num_poisoned_pages_dec(void) | |
332 | { | |
333 | atomic_long_dec(&num_poisoned_pages); | |
334 | } | |
335 | ||
a7420aa5 AK |
336 | #else |
337 | ||
338 | static inline swp_entry_t make_hwpoison_entry(struct page *page) | |
339 | { | |
340 | return swp_entry(0, 0); | |
341 | } | |
342 | ||
343 | static inline int is_hwpoison_entry(swp_entry_t swp) | |
344 | { | |
345 | return 0; | |
346 | } | |
da1b13cc WL |
347 | |
348 | static inline bool test_set_page_hwpoison(struct page *page) | |
349 | { | |
350 | return false; | |
351 | } | |
352 | ||
353 | static inline void num_poisoned_pages_inc(void) | |
354 | { | |
355 | } | |
a7420aa5 AK |
356 | #endif |
357 | ||
358 | #if defined(CONFIG_MEMORY_FAILURE) || defined(CONFIG_MIGRATION) | |
359 | static inline int non_swap_entry(swp_entry_t entry) | |
360 | { | |
361 | return swp_type(entry) >= MAX_SWAPFILES; | |
362 | } | |
363 | #else | |
364 | static inline int non_swap_entry(swp_entry_t entry) | |
365 | { | |
366 | return 0; | |
367 | } | |
368 | #endif | |
a2c16d6c HD |
369 | |
370 | #endif /* _LINUX_SWAPOPS_H */ |