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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
a2c16d6c HD |
2 | #ifndef _LINUX_SWAPOPS_H |
3 | #define _LINUX_SWAPOPS_H | |
4 | ||
5 | #include <linux/radix-tree.h> | |
187f1882 | 6 | #include <linux/bug.h> |
2b740303 | 7 | #include <linux/mm_types.h> |
a2c16d6c | 8 | |
1da177e4 LT |
9 | /* |
10 | * swapcache pages are stored in the swapper_space radix tree. We want to | |
11 | * get good packing density in that tree, so the index should be dense in | |
12 | * the low-order bits. | |
13 | * | |
9b15b817 | 14 | * We arrange the `type' and `offset' fields so that `type' is at the seven |
e83a9596 | 15 | * high-order bits of the swp_entry_t and `offset' is right-aligned in the |
9b15b817 HD |
16 | * remaining bits. Although `type' itself needs only five bits, we allow for |
17 | * shmem/tmpfs to shift it all up a further two bits: see swp_to_radix_entry(). | |
1da177e4 LT |
18 | * |
19 | * swp_entry_t's are *never* stored anywhere in their arch-dependent format. | |
20 | */ | |
3159f943 MW |
21 | #define SWP_TYPE_SHIFT (BITS_PER_XA_VALUE - MAX_SWAPFILES_SHIFT) |
22 | #define SWP_OFFSET_MASK ((1UL << SWP_TYPE_SHIFT) - 1) | |
1da177e4 LT |
23 | |
24 | /* | |
25 | * Store a type+offset into a swp_entry_t in an arch-independent format | |
26 | */ | |
27 | static inline swp_entry_t swp_entry(unsigned long type, pgoff_t offset) | |
28 | { | |
29 | swp_entry_t ret; | |
30 | ||
3159f943 | 31 | ret.val = (type << SWP_TYPE_SHIFT) | (offset & SWP_OFFSET_MASK); |
1da177e4 LT |
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 | { | |
3159f943 | 41 | return (entry.val >> SWP_TYPE_SHIFT); |
1da177e4 LT |
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 | { | |
3159f943 | 50 | return entry.val & SWP_OFFSET_MASK; |
1da177e4 LT |
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 | ||
3159f943 | 91 | entry.val = xa_to_value(arg); |
a2c16d6c HD |
92 | return entry; |
93 | } | |
94 | ||
95 | static inline void *swp_to_radix_entry(swp_entry_t entry) | |
96 | { | |
3159f943 | 97 | return xa_mk_value(entry.val); |
a2c16d6c HD |
98 | } |
99 | ||
5042db43 JG |
100 | #if IS_ENABLED(CONFIG_DEVICE_PRIVATE) |
101 | static inline swp_entry_t make_device_private_entry(struct page *page, bool write) | |
102 | { | |
103 | return swp_entry(write ? SWP_DEVICE_WRITE : SWP_DEVICE_READ, | |
104 | page_to_pfn(page)); | |
105 | } | |
106 | ||
107 | static inline bool is_device_private_entry(swp_entry_t entry) | |
108 | { | |
109 | int type = swp_type(entry); | |
110 | return type == SWP_DEVICE_READ || type == SWP_DEVICE_WRITE; | |
111 | } | |
112 | ||
113 | static inline void make_device_private_entry_read(swp_entry_t *entry) | |
114 | { | |
115 | *entry = swp_entry(SWP_DEVICE_READ, swp_offset(*entry)); | |
116 | } | |
117 | ||
118 | static inline bool is_write_device_private_entry(swp_entry_t entry) | |
119 | { | |
120 | return unlikely(swp_type(entry) == SWP_DEVICE_WRITE); | |
121 | } | |
122 | ||
0d665e7b KS |
123 | static inline unsigned long device_private_entry_to_pfn(swp_entry_t entry) |
124 | { | |
125 | return swp_offset(entry); | |
126 | } | |
127 | ||
5042db43 JG |
128 | static inline struct page *device_private_entry_to_page(swp_entry_t entry) |
129 | { | |
130 | return pfn_to_page(swp_offset(entry)); | |
131 | } | |
132 | ||
2b740303 | 133 | vm_fault_t device_private_entry_fault(struct vm_area_struct *vma, |
5042db43 JG |
134 | unsigned long addr, |
135 | swp_entry_t entry, | |
136 | unsigned int flags, | |
137 | pmd_t *pmdp); | |
138 | #else /* CONFIG_DEVICE_PRIVATE */ | |
139 | static inline swp_entry_t make_device_private_entry(struct page *page, bool write) | |
140 | { | |
141 | return swp_entry(0, 0); | |
142 | } | |
143 | ||
144 | static inline void make_device_private_entry_read(swp_entry_t *entry) | |
145 | { | |
146 | } | |
147 | ||
148 | static inline bool is_device_private_entry(swp_entry_t entry) | |
149 | { | |
150 | return false; | |
151 | } | |
152 | ||
153 | static inline bool is_write_device_private_entry(swp_entry_t entry) | |
154 | { | |
155 | return false; | |
156 | } | |
157 | ||
0d665e7b KS |
158 | static inline unsigned long device_private_entry_to_pfn(swp_entry_t entry) |
159 | { | |
160 | return 0; | |
161 | } | |
162 | ||
5042db43 JG |
163 | static inline struct page *device_private_entry_to_page(swp_entry_t entry) |
164 | { | |
165 | return NULL; | |
166 | } | |
167 | ||
2b740303 | 168 | static inline vm_fault_t device_private_entry_fault(struct vm_area_struct *vma, |
5042db43 JG |
169 | unsigned long addr, |
170 | swp_entry_t entry, | |
171 | unsigned int flags, | |
172 | pmd_t *pmdp) | |
173 | { | |
174 | return VM_FAULT_SIGBUS; | |
175 | } | |
176 | #endif /* CONFIG_DEVICE_PRIVATE */ | |
177 | ||
0697212a CL |
178 | #ifdef CONFIG_MIGRATION |
179 | static inline swp_entry_t make_migration_entry(struct page *page, int write) | |
180 | { | |
616b8371 ZY |
181 | BUG_ON(!PageLocked(compound_head(page))); |
182 | ||
0697212a CL |
183 | return swp_entry(write ? SWP_MIGRATION_WRITE : SWP_MIGRATION_READ, |
184 | page_to_pfn(page)); | |
185 | } | |
186 | ||
187 | static inline int is_migration_entry(swp_entry_t entry) | |
188 | { | |
189 | return unlikely(swp_type(entry) == SWP_MIGRATION_READ || | |
190 | swp_type(entry) == SWP_MIGRATION_WRITE); | |
191 | } | |
192 | ||
193 | static inline int is_write_migration_entry(swp_entry_t entry) | |
194 | { | |
195 | return unlikely(swp_type(entry) == SWP_MIGRATION_WRITE); | |
196 | } | |
197 | ||
0d665e7b KS |
198 | static inline unsigned long migration_entry_to_pfn(swp_entry_t entry) |
199 | { | |
200 | return swp_offset(entry); | |
201 | } | |
202 | ||
0697212a CL |
203 | static inline struct page *migration_entry_to_page(swp_entry_t entry) |
204 | { | |
205 | struct page *p = pfn_to_page(swp_offset(entry)); | |
206 | /* | |
207 | * Any use of migration entries may only occur while the | |
208 | * corresponding page is locked | |
209 | */ | |
616b8371 | 210 | BUG_ON(!PageLocked(compound_head(p))); |
0697212a CL |
211 | return p; |
212 | } | |
213 | ||
214 | static inline void make_migration_entry_read(swp_entry_t *entry) | |
215 | { | |
216 | *entry = swp_entry(SWP_MIGRATION_READ, swp_offset(*entry)); | |
217 | } | |
218 | ||
e66f17ff NH |
219 | extern void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep, |
220 | spinlock_t *ptl); | |
0697212a CL |
221 | extern void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd, |
222 | unsigned long address); | |
cb900f41 KS |
223 | extern void migration_entry_wait_huge(struct vm_area_struct *vma, |
224 | struct mm_struct *mm, pte_t *pte); | |
0697212a CL |
225 | #else |
226 | ||
227 | #define make_migration_entry(page, write) swp_entry(0, 0) | |
5ec553a9 AM |
228 | static inline int is_migration_entry(swp_entry_t swp) |
229 | { | |
230 | return 0; | |
231 | } | |
0d665e7b KS |
232 | |
233 | static inline unsigned long migration_entry_to_pfn(swp_entry_t entry) | |
234 | { | |
235 | return 0; | |
236 | } | |
237 | ||
616b8371 ZY |
238 | static inline struct page *migration_entry_to_page(swp_entry_t entry) |
239 | { | |
240 | return NULL; | |
241 | } | |
242 | ||
0697212a | 243 | static inline void make_migration_entry_read(swp_entry_t *entryp) { } |
e66f17ff NH |
244 | static inline void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep, |
245 | spinlock_t *ptl) { } | |
0697212a CL |
246 | static inline void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd, |
247 | unsigned long address) { } | |
cb900f41 KS |
248 | static inline void migration_entry_wait_huge(struct vm_area_struct *vma, |
249 | struct mm_struct *mm, pte_t *pte) { } | |
0697212a CL |
250 | static inline int is_write_migration_entry(swp_entry_t entry) |
251 | { | |
252 | return 0; | |
253 | } | |
254 | ||
255 | #endif | |
256 | ||
616b8371 ZY |
257 | struct page_vma_mapped_walk; |
258 | ||
259 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION | |
260 | extern void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw, | |
261 | struct page *page); | |
262 | ||
263 | extern void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, | |
264 | struct page *new); | |
265 | ||
266 | extern void pmd_migration_entry_wait(struct mm_struct *mm, pmd_t *pmd); | |
267 | ||
268 | static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd) | |
269 | { | |
270 | swp_entry_t arch_entry; | |
271 | ||
ab6e3d09 NH |
272 | if (pmd_swp_soft_dirty(pmd)) |
273 | pmd = pmd_swp_clear_soft_dirty(pmd); | |
616b8371 ZY |
274 | arch_entry = __pmd_to_swp_entry(pmd); |
275 | return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry)); | |
276 | } | |
277 | ||
278 | static inline pmd_t swp_entry_to_pmd(swp_entry_t entry) | |
279 | { | |
280 | swp_entry_t arch_entry; | |
281 | ||
282 | arch_entry = __swp_entry(swp_type(entry), swp_offset(entry)); | |
283 | return __swp_entry_to_pmd(arch_entry); | |
284 | } | |
285 | ||
286 | static inline int is_pmd_migration_entry(pmd_t pmd) | |
287 | { | |
288 | return !pmd_present(pmd) && is_migration_entry(pmd_to_swp_entry(pmd)); | |
289 | } | |
290 | #else | |
291 | static inline void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw, | |
292 | struct page *page) | |
293 | { | |
294 | BUILD_BUG(); | |
295 | } | |
296 | ||
297 | static inline void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, | |
298 | struct page *new) | |
299 | { | |
300 | BUILD_BUG(); | |
301 | } | |
302 | ||
303 | static inline void pmd_migration_entry_wait(struct mm_struct *m, pmd_t *p) { } | |
304 | ||
305 | static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd) | |
306 | { | |
307 | return swp_entry(0, 0); | |
308 | } | |
309 | ||
310 | static inline pmd_t swp_entry_to_pmd(swp_entry_t entry) | |
311 | { | |
312 | return __pmd(0); | |
313 | } | |
314 | ||
315 | static inline int is_pmd_migration_entry(pmd_t pmd) | |
316 | { | |
317 | return 0; | |
318 | } | |
319 | #endif | |
320 | ||
a7420aa5 | 321 | #ifdef CONFIG_MEMORY_FAILURE |
8e30456b NH |
322 | |
323 | extern atomic_long_t num_poisoned_pages __read_mostly; | |
324 | ||
a7420aa5 AK |
325 | /* |
326 | * Support for hardware poisoned pages | |
327 | */ | |
328 | static inline swp_entry_t make_hwpoison_entry(struct page *page) | |
329 | { | |
330 | BUG_ON(!PageLocked(page)); | |
331 | return swp_entry(SWP_HWPOISON, page_to_pfn(page)); | |
332 | } | |
333 | ||
334 | static inline int is_hwpoison_entry(swp_entry_t entry) | |
335 | { | |
336 | return swp_type(entry) == SWP_HWPOISON; | |
337 | } | |
8e30456b NH |
338 | |
339 | static inline void num_poisoned_pages_inc(void) | |
340 | { | |
341 | atomic_long_inc(&num_poisoned_pages); | |
342 | } | |
343 | ||
344 | static inline void num_poisoned_pages_dec(void) | |
345 | { | |
346 | atomic_long_dec(&num_poisoned_pages); | |
347 | } | |
348 | ||
a7420aa5 AK |
349 | #else |
350 | ||
351 | static inline swp_entry_t make_hwpoison_entry(struct page *page) | |
352 | { | |
353 | return swp_entry(0, 0); | |
354 | } | |
355 | ||
356 | static inline int is_hwpoison_entry(swp_entry_t swp) | |
357 | { | |
358 | return 0; | |
359 | } | |
da1b13cc | 360 | |
da1b13cc WL |
361 | static inline void num_poisoned_pages_inc(void) |
362 | { | |
363 | } | |
a7420aa5 AK |
364 | #endif |
365 | ||
366 | #if defined(CONFIG_MEMORY_FAILURE) || defined(CONFIG_MIGRATION) | |
367 | static inline int non_swap_entry(swp_entry_t entry) | |
368 | { | |
369 | return swp_type(entry) >= MAX_SWAPFILES; | |
370 | } | |
371 | #else | |
372 | static inline int non_swap_entry(swp_entry_t entry) | |
373 | { | |
374 | return 0; | |
375 | } | |
376 | #endif | |
a2c16d6c HD |
377 | |
378 | #endif /* _LINUX_SWAPOPS_H */ |