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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
5b99cd0e HC |
2 | #ifndef _LINUX_MM_TYPES_H |
3 | #define _LINUX_MM_TYPES_H | |
4 | ||
2e58f173 IM |
5 | #include <linux/mm_types_task.h> |
6 | ||
4f9a58d7 | 7 | #include <linux/auxvec.h> |
5b99cd0e HC |
8 | #include <linux/list.h> |
9 | #include <linux/spinlock.h> | |
c92ff1bd MS |
10 | #include <linux/rbtree.h> |
11 | #include <linux/rwsem.h> | |
12 | #include <linux/completion.h> | |
cddb8a5c | 13 | #include <linux/cpumask.h> |
d4b3b638 | 14 | #include <linux/uprobes.h> |
bbeae5b0 | 15 | #include <linux/page-flags-layout.h> |
ec8d7c14 | 16 | #include <linux/workqueue.h> |
57efa1fe | 17 | #include <linux/seqlock.h> |
2e58f173 | 18 | |
c92ff1bd | 19 | #include <asm/mmu.h> |
5b99cd0e | 20 | |
4f9a58d7 OH |
21 | #ifndef AT_VECTOR_SIZE_ARCH |
22 | #define AT_VECTOR_SIZE_ARCH 0 | |
23 | #endif | |
24 | #define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1)) | |
25 | ||
82e69a12 | 26 | #define INIT_PASID 0 |
1c8f4220 | 27 | |
5b99cd0e | 28 | struct address_space; |
1306a85a | 29 | struct mem_cgroup; |
5b99cd0e HC |
30 | |
31 | /* | |
32 | * Each physical page in the system has a struct page associated with | |
33 | * it to keep track of whatever it is we are using the page for at the | |
34 | * moment. Note that we have no way to track which tasks are using | |
35 | * a page, though if it is a pagecache page, rmap structures can tell us | |
97b4a671 | 36 | * who is mapping it. |
be50015d | 37 | * |
97b4a671 MW |
38 | * If you allocate the page using alloc_pages(), you can use some of the |
39 | * space in struct page for your own purposes. The five words in the main | |
40 | * union are available, except for bit 0 of the first word which must be | |
41 | * kept clear. Many users use this word to store a pointer to an object | |
42 | * which is guaranteed to be aligned. If you use the same storage as | |
43 | * page->mapping, you must restore it to NULL before freeing the page. | |
be50015d | 44 | * |
97b4a671 MW |
45 | * If your page will not be mapped to userspace, you can also use the four |
46 | * bytes in the mapcount union, but you must call page_mapcount_reset() | |
47 | * before freeing it. | |
48 | * | |
49 | * If you want to use the refcount field, it must be used in such a way | |
50 | * that other CPUs temporarily incrementing and then decrementing the | |
51 | * refcount does not cause problems. On receiving the page from | |
52 | * alloc_pages(), the refcount will be positive. | |
53 | * | |
54 | * If you allocate pages of order > 0, you can use some of the fields | |
55 | * in each subpage, but you may need to restore some of their values | |
56 | * afterwards. | |
fc9bb8c7 | 57 | * |
4cf7c8bf MW |
58 | * SLUB uses cmpxchg_double() to atomically update its freelist and |
59 | * counters. That requires that freelist & counters be adjacent and | |
60 | * double-word aligned. We align all struct pages to double-word | |
61 | * boundaries, and ensure that 'freelist' is aligned within the | |
62 | * struct. | |
5b99cd0e | 63 | */ |
e20df2c6 MW |
64 | #ifdef CONFIG_HAVE_ALIGNED_STRUCT_PAGE |
65 | #define _struct_page_alignment __aligned(2 * sizeof(unsigned long)) | |
66 | #else | |
0dd4da5b | 67 | #define _struct_page_alignment |
7d27a04b | 68 | #endif |
e20df2c6 | 69 | |
5b99cd0e HC |
70 | struct page { |
71 | unsigned long flags; /* Atomic flags, some possibly | |
72 | * updated asynchronously */ | |
b7ccc7f8 | 73 | /* |
4da1984e MW |
74 | * Five words (20/40 bytes) are available in this union. |
75 | * WARNING: bit 0 of the first word is used for PageTail(). That | |
76 | * means the other users of this union MUST NOT use the bit to | |
b7ccc7f8 MW |
77 | * avoid collision and false-positive PageTail(). |
78 | */ | |
8456a648 | 79 | union { |
66a6ffd2 | 80 | struct { /* Page cache and anonymous pages */ |
4da1984e MW |
81 | /** |
82 | * @lru: Pageout list, eg. active_list protected by | |
15b44736 | 83 | * lruvec->lru_lock. Sometimes used as a generic list |
4da1984e MW |
84 | * by the page owner. |
85 | */ | |
86 | struct list_head lru; | |
66a6ffd2 MW |
87 | /* See page-flags.h for PAGE_MAPPING_FLAGS */ |
88 | struct address_space *mapping; | |
89 | pgoff_t index; /* Our offset within mapping. */ | |
90 | /** | |
91 | * @private: Mapping-private opaque data. | |
92 | * Usually used for buffer_heads if PagePrivate. | |
93 | * Used for swp_entry_t if PageSwapCache. | |
94 | * Indicates order in the buddy system if PageBuddy. | |
95 | */ | |
96 | unsigned long private; | |
97 | }; | |
c25fff71 | 98 | struct { /* page_pool used by netstack */ |
c07aea3e MC |
99 | /** |
100 | * @pp_magic: magic value to avoid recycling non | |
101 | * page_pool allocated pages. | |
102 | */ | |
103 | unsigned long pp_magic; | |
104 | struct page_pool *pp; | |
105 | unsigned long _pp_mapping_pad; | |
0e9d2a0a YL |
106 | unsigned long dma_addr; |
107 | union { | |
108 | /** | |
109 | * dma_addr_upper: might require a 64-bit | |
110 | * value on 32-bit architectures. | |
111 | */ | |
112 | unsigned long dma_addr_upper; | |
113 | /** | |
114 | * For frag page support, not supported in | |
115 | * 32-bit architectures with 64-bit DMA. | |
116 | */ | |
117 | atomic_long_t pp_frag_count; | |
118 | }; | |
c25fff71 | 119 | }; |
66a6ffd2 | 120 | struct { /* slab, slob and slub */ |
4da1984e | 121 | union { |
3e05617c | 122 | struct list_head slab_list; |
4da1984e MW |
123 | struct { /* Partial pages */ |
124 | struct page *next; | |
125 | #ifdef CONFIG_64BIT | |
126 | int pages; /* Nr of pages left */ | |
127 | int pobjects; /* Approximate count */ | |
128 | #else | |
129 | short int pages; | |
130 | short int pobjects; | |
131 | #endif | |
132 | }; | |
133 | }; | |
66a6ffd2 MW |
134 | struct kmem_cache *slab_cache; /* not slob */ |
135 | /* Double-word boundary */ | |
136 | void *freelist; /* first free object */ | |
137 | union { | |
138 | void *s_mem; /* slab: first object */ | |
139 | unsigned long counters; /* SLUB */ | |
140 | struct { /* SLUB */ | |
141 | unsigned inuse:16; | |
142 | unsigned objects:15; | |
143 | unsigned frozen:1; | |
144 | }; | |
145 | }; | |
146 | }; | |
4da1984e MW |
147 | struct { /* Tail pages of compound page */ |
148 | unsigned long compound_head; /* Bit zero is set */ | |
149 | ||
150 | /* First tail page only */ | |
151 | unsigned char compound_dtor; | |
152 | unsigned char compound_order; | |
153 | atomic_t compound_mapcount; | |
1378a5ee | 154 | unsigned int compound_nr; /* 1 << compound_order */ |
4da1984e MW |
155 | }; |
156 | struct { /* Second tail page of compound page */ | |
157 | unsigned long _compound_pad_1; /* compound_head */ | |
47e29d32 | 158 | atomic_t hpage_pinned_refcount; |
87eaceb3 | 159 | /* For both global and memcg */ |
4da1984e MW |
160 | struct list_head deferred_list; |
161 | }; | |
66a6ffd2 | 162 | struct { /* Page table pages */ |
4da1984e MW |
163 | unsigned long _pt_pad_1; /* compound_head */ |
164 | pgtable_t pmd_huge_pte; /* protected by page->ptl */ | |
66a6ffd2 | 165 | unsigned long _pt_pad_2; /* mapping */ |
4231aba0 NP |
166 | union { |
167 | struct mm_struct *pt_mm; /* x86 pgds only */ | |
168 | atomic_t pt_frag_refcount; /* powerpc */ | |
169 | }; | |
7d27a04b | 170 | #if ALLOC_SPLIT_PTLOCKS |
66a6ffd2 | 171 | spinlock_t *ptl; |
7d27a04b | 172 | #else |
66a6ffd2 | 173 | spinlock_t ptl; |
7d27a04b | 174 | #endif |
7d27a04b | 175 | }; |
50e7fbc3 MW |
176 | struct { /* ZONE_DEVICE pages */ |
177 | /** @pgmap: Points to the hosting device page map. */ | |
178 | struct dev_pagemap *pgmap; | |
8a164fef | 179 | void *zone_device_data; |
76470ccd RC |
180 | /* |
181 | * ZONE_DEVICE private pages are counted as being | |
182 | * mapped so the next 3 words hold the mapping, index, | |
183 | * and private fields from the source anonymous or | |
184 | * page cache page while the page is migrated to device | |
185 | * private memory. | |
186 | * ZONE_DEVICE MEMORY_DEVICE_FS_DAX pages also | |
187 | * use the mapping, index, and private fields when | |
188 | * pmem backed DAX files are mapped. | |
189 | */ | |
50e7fbc3 | 190 | }; |
4da1984e MW |
191 | |
192 | /** @rcu_head: You can use this to free a page by RCU. */ | |
193 | struct rcu_head rcu_head; | |
7d27a04b MW |
194 | }; |
195 | ||
b21999da MW |
196 | union { /* This union is 4 bytes in size. */ |
197 | /* | |
198 | * If the page can be mapped to userspace, encodes the number | |
199 | * of times this page is referenced by a page table. | |
200 | */ | |
201 | atomic_t _mapcount; | |
202 | ||
6e292b9b MW |
203 | /* |
204 | * If the page is neither PageSlab nor mappable to userspace, | |
205 | * the value stored here may help determine what this page | |
206 | * is used for. See page-flags.h for a list of page types | |
207 | * which are currently stored here. | |
208 | */ | |
209 | unsigned int page_type; | |
210 | ||
ca9c88c7 | 211 | unsigned int active; /* SLAB */ |
ca9c88c7 | 212 | int units; /* SLOB */ |
81819f0f | 213 | }; |
fc9bb8c7 | 214 | |
b21999da MW |
215 | /* Usage count. *DO NOT USE DIRECTLY*. See page_ref.h */ |
216 | atomic_t _refcount; | |
217 | ||
1306a85a | 218 | #ifdef CONFIG_MEMCG |
bcfe06bf | 219 | unsigned long memcg_data; |
1306a85a JW |
220 | #endif |
221 | ||
5b99cd0e HC |
222 | /* |
223 | * On machines where all RAM is mapped into kernel address space, | |
224 | * we can simply calculate the virtual address. On machines with | |
225 | * highmem some memory is mapped into kernel virtual memory | |
226 | * dynamically, so we need a place to store that address. | |
227 | * Note that this field could be 16 bits on x86 ... ;) | |
228 | * | |
229 | * Architectures with slow multiplication can define | |
230 | * WANT_PAGE_VIRTUAL in asm/page.h | |
231 | */ | |
232 | #if defined(WANT_PAGE_VIRTUAL) | |
233 | void *virtual; /* Kernel virtual address (NULL if | |
234 | not kmapped, ie. highmem) */ | |
235 | #endif /* WANT_PAGE_VIRTUAL */ | |
dfec072e | 236 | |
90572890 PZ |
237 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
238 | int _last_cpupid; | |
57e0a030 | 239 | #endif |
e20df2c6 | 240 | } _struct_page_alignment; |
5b99cd0e | 241 | |
169226f7 YS |
242 | static inline atomic_t *compound_mapcount_ptr(struct page *page) |
243 | { | |
244 | return &page[1].compound_mapcount; | |
245 | } | |
246 | ||
47e29d32 JH |
247 | static inline atomic_t *compound_pincount_ptr(struct page *page) |
248 | { | |
249 | return &page[2].hpage_pinned_refcount; | |
250 | } | |
251 | ||
d1402fc7 LG |
252 | /* |
253 | * Used for sizing the vmemmap region on some architectures | |
254 | */ | |
255 | #define STRUCT_PAGE_MAX_SHIFT (order_base_2(sizeof(struct page))) | |
256 | ||
b63ae8ca AD |
257 | #define PAGE_FRAG_CACHE_MAX_SIZE __ALIGN_MASK(32768, ~PAGE_MASK) |
258 | #define PAGE_FRAG_CACHE_MAX_ORDER get_order(PAGE_FRAG_CACHE_MAX_SIZE) | |
259 | ||
b03641af | 260 | #define page_private(page) ((page)->private) |
60e65a6f GJ |
261 | |
262 | static inline void set_page_private(struct page *page, unsigned long private) | |
263 | { | |
264 | page->private = private; | |
265 | } | |
b03641af | 266 | |
b63ae8ca AD |
267 | struct page_frag_cache { |
268 | void * va; | |
269 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
270 | __u16 offset; | |
271 | __u16 size; | |
272 | #else | |
273 | __u32 offset; | |
274 | #endif | |
275 | /* we maintain a pagecount bias, so that we dont dirty cache line | |
0139aa7b | 276 | * containing page->_refcount every time we allocate a fragment. |
b63ae8ca AD |
277 | */ |
278 | unsigned int pagecnt_bias; | |
279 | bool pfmemalloc; | |
280 | }; | |
281 | ||
64b990d2 | 282 | typedef unsigned long vm_flags_t; |
ca16d140 | 283 | |
8feae131 DH |
284 | /* |
285 | * A region containing a mapping of a non-memory backed file under NOMMU | |
286 | * conditions. These are held in a global tree and are pinned by the VMAs that | |
287 | * map parts of them. | |
288 | */ | |
289 | struct vm_region { | |
290 | struct rb_node vm_rb; /* link in global region tree */ | |
ca16d140 | 291 | vm_flags_t vm_flags; /* VMA vm_flags */ |
8feae131 DH |
292 | unsigned long vm_start; /* start address of region */ |
293 | unsigned long vm_end; /* region initialised to here */ | |
dd8632a1 | 294 | unsigned long vm_top; /* region allocated to here */ |
8feae131 DH |
295 | unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */ |
296 | struct file *vm_file; /* the backing file or NULL */ | |
297 | ||
1e2ae599 | 298 | int vm_usage; /* region usage count (access under nommu_region_sem) */ |
cfe79c00 MF |
299 | bool vm_icache_flushed : 1; /* true if the icache has been flushed for |
300 | * this region */ | |
8feae131 DH |
301 | }; |
302 | ||
745f234b AA |
303 | #ifdef CONFIG_USERFAULTFD |
304 | #define NULL_VM_UFFD_CTX ((struct vm_userfaultfd_ctx) { NULL, }) | |
305 | struct vm_userfaultfd_ctx { | |
306 | struct userfaultfd_ctx *ctx; | |
307 | }; | |
308 | #else /* CONFIG_USERFAULTFD */ | |
309 | #define NULL_VM_UFFD_CTX ((struct vm_userfaultfd_ctx) {}) | |
310 | struct vm_userfaultfd_ctx {}; | |
311 | #endif /* CONFIG_USERFAULTFD */ | |
312 | ||
c92ff1bd | 313 | /* |
552657b7 | 314 | * This struct describes a virtual memory area. There is one of these |
315 | * per VM-area/task. A VM area is any part of the process virtual memory | |
c92ff1bd MS |
316 | * space that has a special rule for the page-fault handlers (ie a shared |
317 | * library, the executable area etc). | |
318 | */ | |
319 | struct vm_area_struct { | |
e4c6bfd2 RR |
320 | /* The first cache line has the info for VMA tree walking. */ |
321 | ||
c92ff1bd MS |
322 | unsigned long vm_start; /* Our start address within vm_mm. */ |
323 | unsigned long vm_end; /* The first byte after our end address | |
324 | within vm_mm. */ | |
325 | ||
326 | /* linked list of VM areas per task, sorted by address */ | |
297c5eee | 327 | struct vm_area_struct *vm_next, *vm_prev; |
c92ff1bd | 328 | |
c92ff1bd MS |
329 | struct rb_node vm_rb; |
330 | ||
d3737187 ML |
331 | /* |
332 | * Largest free memory gap in bytes to the left of this VMA. | |
333 | * Either between this VMA and vma->vm_prev, or between one of the | |
334 | * VMAs below us in the VMA rbtree and its ->vm_prev. This helps | |
335 | * get_unmapped_area find a free area of the right size. | |
336 | */ | |
337 | unsigned long rb_subtree_gap; | |
338 | ||
e4c6bfd2 RR |
339 | /* Second cache line starts here. */ |
340 | ||
341 | struct mm_struct *vm_mm; /* The address space we belong to. */ | |
574c5b3d TH |
342 | |
343 | /* | |
344 | * Access permissions of this VMA. | |
345 | * See vmf_insert_mixed_prot() for discussion. | |
346 | */ | |
347 | pgprot_t vm_page_prot; | |
e4c6bfd2 RR |
348 | unsigned long vm_flags; /* Flags, see mm.h. */ |
349 | ||
c92ff1bd MS |
350 | /* |
351 | * For areas with an address space and backing store, | |
27ba0644 | 352 | * linkage into the address_space->i_mmap interval tree. |
c92ff1bd | 353 | */ |
ac51b934 KS |
354 | struct { |
355 | struct rb_node rb; | |
356 | unsigned long rb_subtree_last; | |
c92ff1bd MS |
357 | } shared; |
358 | ||
359 | /* | |
360 | * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma | |
361 | * list, after a COW of one of the file pages. A MAP_SHARED vma | |
362 | * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack | |
363 | * or brk vma (with NULL file) can only be in an anon_vma list. | |
364 | */ | |
c1e8d7c6 | 365 | struct list_head anon_vma_chain; /* Serialized by mmap_lock & |
5beb4930 | 366 | * page_table_lock */ |
c92ff1bd MS |
367 | struct anon_vma *anon_vma; /* Serialized by page_table_lock */ |
368 | ||
369 | /* Function pointers to deal with this struct. */ | |
f0f37e2f | 370 | const struct vm_operations_struct *vm_ops; |
c92ff1bd MS |
371 | |
372 | /* Information about our backing store: */ | |
373 | unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE | |
ea1754a0 | 374 | units */ |
c92ff1bd MS |
375 | struct file * vm_file; /* File we map to (can be NULL). */ |
376 | void * vm_private_data; /* was vm_pte (shared mem) */ | |
c92ff1bd | 377 | |
219f8a2e | 378 | #ifdef CONFIG_SWAP |
ec560175 | 379 | atomic_long_t swap_readahead_info; |
219f8a2e | 380 | #endif |
c92ff1bd | 381 | #ifndef CONFIG_MMU |
8feae131 | 382 | struct vm_region *vm_region; /* NOMMU mapping region */ |
c92ff1bd MS |
383 | #endif |
384 | #ifdef CONFIG_NUMA | |
385 | struct mempolicy *vm_policy; /* NUMA policy for the VMA */ | |
386 | #endif | |
745f234b | 387 | struct vm_userfaultfd_ctx vm_userfaultfd_ctx; |
3859a271 | 388 | } __randomize_layout; |
c92ff1bd | 389 | |
b564daf8 ON |
390 | struct core_thread { |
391 | struct task_struct *task; | |
392 | struct core_thread *next; | |
393 | }; | |
394 | ||
32ecb1f2 | 395 | struct core_state { |
c5f1cc8c | 396 | atomic_t nr_threads; |
b564daf8 | 397 | struct core_thread dumper; |
32ecb1f2 ON |
398 | struct completion startup; |
399 | }; | |
400 | ||
db446a08 | 401 | struct kioctx_table; |
c92ff1bd | 402 | struct mm_struct { |
c1a2f7f0 RR |
403 | struct { |
404 | struct vm_area_struct *mmap; /* list of VMAs */ | |
405 | struct rb_root mm_rb; | |
7a9cdebd | 406 | u64 vmacache_seqnum; /* per-thread vmacache */ |
efc1a3b1 | 407 | #ifdef CONFIG_MMU |
c1a2f7f0 | 408 | unsigned long (*get_unmapped_area) (struct file *filp, |
c92ff1bd MS |
409 | unsigned long addr, unsigned long len, |
410 | unsigned long pgoff, unsigned long flags); | |
efc1a3b1 | 411 | #endif |
c1a2f7f0 RR |
412 | unsigned long mmap_base; /* base of mmap area */ |
413 | unsigned long mmap_legacy_base; /* base of mmap area in bottom-up allocations */ | |
1b028f78 | 414 | #ifdef CONFIG_HAVE_ARCH_COMPAT_MMAP_BASES |
041711ce | 415 | /* Base addresses for compatible mmap() */ |
c1a2f7f0 RR |
416 | unsigned long mmap_compat_base; |
417 | unsigned long mmap_compat_legacy_base; | |
1b028f78 | 418 | #endif |
c1a2f7f0 RR |
419 | unsigned long task_size; /* size of task vm space */ |
420 | unsigned long highest_vm_end; /* highest vma end address */ | |
421 | pgd_t * pgd; | |
422 | ||
227a4aad MD |
423 | #ifdef CONFIG_MEMBARRIER |
424 | /** | |
425 | * @membarrier_state: Flags controlling membarrier behavior. | |
426 | * | |
427 | * This field is close to @pgd to hopefully fit in the same | |
428 | * cache-line, which needs to be touched by switch_mm(). | |
429 | */ | |
430 | atomic_t membarrier_state; | |
431 | #endif | |
432 | ||
c1a2f7f0 RR |
433 | /** |
434 | * @mm_users: The number of users including userspace. | |
435 | * | |
436 | * Use mmget()/mmget_not_zero()/mmput() to modify. When this | |
437 | * drops to 0 (i.e. when the task exits and there are no other | |
438 | * temporary reference holders), we also release a reference on | |
439 | * @mm_count (which may then free the &struct mm_struct if | |
440 | * @mm_count also drops to 0). | |
441 | */ | |
442 | atomic_t mm_users; | |
443 | ||
444 | /** | |
445 | * @mm_count: The number of references to &struct mm_struct | |
446 | * (@mm_users count as 1). | |
447 | * | |
448 | * Use mmgrab()/mmdrop() to modify. When this drops to 0, the | |
449 | * &struct mm_struct is freed. | |
450 | */ | |
451 | atomic_t mm_count; | |
b279ddc3 | 452 | |
c4812909 | 453 | #ifdef CONFIG_MMU |
c1a2f7f0 | 454 | atomic_long_t pgtables_bytes; /* PTE page table pages */ |
5a3fbef3 | 455 | #endif |
c1a2f7f0 | 456 | int map_count; /* number of VMAs */ |
481b4bb5 | 457 | |
c1a2f7f0 RR |
458 | spinlock_t page_table_lock; /* Protects page tables and some |
459 | * counters | |
460 | */ | |
2e302543 FT |
461 | /* |
462 | * With some kernel config, the current mmap_lock's offset | |
463 | * inside 'mm_struct' is at 0x120, which is very optimal, as | |
464 | * its two hot fields 'count' and 'owner' sit in 2 different | |
465 | * cachelines, and when mmap_lock is highly contended, both | |
466 | * of the 2 fields will be accessed frequently, current layout | |
467 | * will help to reduce cache bouncing. | |
468 | * | |
469 | * So please be careful with adding new fields before | |
470 | * mmap_lock, which can easily push the 2 fields into one | |
471 | * cacheline. | |
472 | */ | |
da1c55f1 | 473 | struct rw_semaphore mmap_lock; |
c92ff1bd | 474 | |
c1a2f7f0 RR |
475 | struct list_head mmlist; /* List of maybe swapped mm's. These |
476 | * are globally strung together off | |
477 | * init_mm.mmlist, and are protected | |
478 | * by mmlist_lock | |
479 | */ | |
c92ff1bd | 480 | |
c92ff1bd | 481 | |
c1a2f7f0 RR |
482 | unsigned long hiwater_rss; /* High-watermark of RSS usage */ |
483 | unsigned long hiwater_vm; /* High-water virtual memory usage */ | |
c92ff1bd | 484 | |
c1a2f7f0 RR |
485 | unsigned long total_vm; /* Total pages mapped */ |
486 | unsigned long locked_vm; /* Pages that have PG_mlocked set */ | |
70f8a3ca | 487 | atomic64_t pinned_vm; /* Refcount permanently increased */ |
c1a2f7f0 RR |
488 | unsigned long data_vm; /* VM_WRITE & ~VM_SHARED & ~VM_STACK */ |
489 | unsigned long exec_vm; /* VM_EXEC & ~VM_WRITE & ~VM_STACK */ | |
490 | unsigned long stack_vm; /* VM_STACK */ | |
491 | unsigned long def_flags; | |
88aa7cc6 | 492 | |
2e302543 FT |
493 | /** |
494 | * @write_protect_seq: Locked when any thread is write | |
495 | * protecting pages mapped by this mm to enforce a later COW, | |
496 | * for instance during page table copying for fork(). | |
497 | */ | |
498 | seqcount_t write_protect_seq; | |
499 | ||
c1a2f7f0 | 500 | spinlock_t arg_lock; /* protect the below fields */ |
2e302543 | 501 | |
c1a2f7f0 RR |
502 | unsigned long start_code, end_code, start_data, end_data; |
503 | unsigned long start_brk, brk, start_stack; | |
504 | unsigned long arg_start, arg_end, env_start, env_end; | |
c92ff1bd | 505 | |
c1a2f7f0 | 506 | unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ |
c92ff1bd | 507 | |
c1a2f7f0 RR |
508 | /* |
509 | * Special counters, in some configurations protected by the | |
510 | * page_table_lock, in other configurations by being atomic. | |
511 | */ | |
512 | struct mm_rss_stat rss_stat; | |
801460d0 | 513 | |
c1a2f7f0 | 514 | struct linux_binfmt *binfmt; |
6345d24d | 515 | |
c1a2f7f0 RR |
516 | /* Architecture-specific MM context */ |
517 | mm_context_t context; | |
c92ff1bd | 518 | |
c1a2f7f0 | 519 | unsigned long flags; /* Must use atomic bitops to access */ |
c92ff1bd | 520 | |
c1a2f7f0 | 521 | struct core_state *core_state; /* coredumping support */ |
227a4aad | 522 | |
858f0993 | 523 | #ifdef CONFIG_AIO |
c1a2f7f0 RR |
524 | spinlock_t ioctx_lock; |
525 | struct kioctx_table __rcu *ioctx_table; | |
858f0993 | 526 | #endif |
f98bafa0 | 527 | #ifdef CONFIG_MEMCG |
c1a2f7f0 RR |
528 | /* |
529 | * "owner" points to a task that is regarded as the canonical | |
530 | * user/owner of this mm. All of the following must be true in | |
531 | * order for it to be changed: | |
532 | * | |
533 | * current == mm->owner | |
534 | * current->mm != mm | |
535 | * new_owner->mm == mm | |
536 | * new_owner->alloc_lock is held | |
537 | */ | |
538 | struct task_struct __rcu *owner; | |
78fb7466 | 539 | #endif |
c1a2f7f0 | 540 | struct user_namespace *user_ns; |
925d1c40 | 541 | |
c1a2f7f0 RR |
542 | /* store ref to file /proc/<pid>/exe symlink points to */ |
543 | struct file __rcu *exe_file; | |
cddb8a5c | 544 | #ifdef CONFIG_MMU_NOTIFIER |
984cfe4e | 545 | struct mmu_notifier_subscriptions *notifier_subscriptions; |
e7a00c45 | 546 | #endif |
e009bb30 | 547 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS |
c1a2f7f0 | 548 | pgtable_t pmd_huge_pte; /* protected by page_table_lock */ |
cbee9f88 PZ |
549 | #endif |
550 | #ifdef CONFIG_NUMA_BALANCING | |
c1a2f7f0 RR |
551 | /* |
552 | * numa_next_scan is the next time that the PTEs will be marked | |
553 | * pte_numa. NUMA hinting faults will gather statistics and | |
554 | * migrate pages to new nodes if necessary. | |
555 | */ | |
556 | unsigned long numa_next_scan; | |
cbee9f88 | 557 | |
c1a2f7f0 RR |
558 | /* Restart point for scanning and setting pte_numa */ |
559 | unsigned long numa_scan_offset; | |
6e5fb223 | 560 | |
c1a2f7f0 RR |
561 | /* numa_scan_seq prevents two threads setting pte_numa */ |
562 | int numa_scan_seq; | |
20841405 | 563 | #endif |
c1a2f7f0 RR |
564 | /* |
565 | * An operation with batched TLB flushing is going on. Anything | |
566 | * that can move process memory needs to flush the TLB when | |
567 | * moving a PROT_NONE or PROT_NUMA mapped page. | |
568 | */ | |
569 | atomic_t tlb_flush_pending; | |
3ea27719 | 570 | #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH |
c1a2f7f0 RR |
571 | /* See flush_tlb_batched_pending() */ |
572 | bool tlb_flush_batched; | |
6345d24d | 573 | #endif |
c1a2f7f0 | 574 | struct uprobes_state uprobes_state; |
5d317b2b | 575 | #ifdef CONFIG_HUGETLB_PAGE |
c1a2f7f0 | 576 | atomic_long_t hugetlb_usage; |
5d317b2b | 577 | #endif |
c1a2f7f0 | 578 | struct work_struct async_put_work; |
52ad9bc6 FY |
579 | |
580 | #ifdef CONFIG_IOMMU_SUPPORT | |
581 | u32 pasid; | |
582 | #endif | |
c1a2f7f0 RR |
583 | } __randomize_layout; |
584 | ||
585 | /* | |
586 | * The mm_cpumask needs to be at the end of mm_struct, because it | |
587 | * is dynamically sized based on nr_cpu_ids. | |
588 | */ | |
589 | unsigned long cpu_bitmap[]; | |
590 | }; | |
c92ff1bd | 591 | |
abe722a1 IM |
592 | extern struct mm_struct init_mm; |
593 | ||
c1a2f7f0 | 594 | /* Pointer magic because the dynamic array size confuses some compilers. */ |
6345d24d LT |
595 | static inline void mm_init_cpumask(struct mm_struct *mm) |
596 | { | |
c1a2f7f0 RR |
597 | unsigned long cpu_bitmap = (unsigned long)mm; |
598 | ||
599 | cpu_bitmap += offsetof(struct mm_struct, cpu_bitmap); | |
600 | cpumask_clear((struct cpumask *)cpu_bitmap); | |
6345d24d LT |
601 | } |
602 | ||
45e575ab | 603 | /* Future-safe accessor for struct mm_struct's cpu_vm_mask. */ |
de03c72c KM |
604 | static inline cpumask_t *mm_cpumask(struct mm_struct *mm) |
605 | { | |
c1a2f7f0 | 606 | return (struct cpumask *)&mm->cpu_bitmap; |
de03c72c | 607 | } |
45e575ab | 608 | |
56236a59 | 609 | struct mmu_gather; |
a72afd87 | 610 | extern void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm); |
d8b45053 | 611 | extern void tlb_gather_mmu_fullmm(struct mmu_gather *tlb, struct mm_struct *mm); |
ae8eba8b | 612 | extern void tlb_finish_mmu(struct mmu_gather *tlb); |
56236a59 | 613 | |
16af97dc | 614 | static inline void init_tlb_flush_pending(struct mm_struct *mm) |
20841405 | 615 | { |
16af97dc | 616 | atomic_set(&mm->tlb_flush_pending, 0); |
20841405 | 617 | } |
16af97dc NA |
618 | |
619 | static inline void inc_tlb_flush_pending(struct mm_struct *mm) | |
20841405 | 620 | { |
16af97dc | 621 | atomic_inc(&mm->tlb_flush_pending); |
af2c1401 | 622 | /* |
8b1b436d PZ |
623 | * The only time this value is relevant is when there are indeed pages |
624 | * to flush. And we'll only flush pages after changing them, which | |
625 | * requires the PTL. | |
626 | * | |
627 | * So the ordering here is: | |
628 | * | |
040cca3a | 629 | * atomic_inc(&mm->tlb_flush_pending); |
8b1b436d PZ |
630 | * spin_lock(&ptl); |
631 | * ... | |
632 | * set_pte_at(); | |
633 | * spin_unlock(&ptl); | |
634 | * | |
635 | * spin_lock(&ptl) | |
636 | * mm_tlb_flush_pending(); | |
637 | * .... | |
638 | * spin_unlock(&ptl); | |
639 | * | |
640 | * flush_tlb_range(); | |
040cca3a | 641 | * atomic_dec(&mm->tlb_flush_pending); |
8b1b436d | 642 | * |
0e709703 PZ |
643 | * Where the increment if constrained by the PTL unlock, it thus |
644 | * ensures that the increment is visible if the PTE modification is | |
645 | * visible. After all, if there is no PTE modification, nobody cares | |
646 | * about TLB flushes either. | |
647 | * | |
648 | * This very much relies on users (mm_tlb_flush_pending() and | |
649 | * mm_tlb_flush_nested()) only caring about _specific_ PTEs (and | |
650 | * therefore specific PTLs), because with SPLIT_PTE_PTLOCKS and RCpc | |
651 | * locks (PPC) the unlock of one doesn't order against the lock of | |
652 | * another PTL. | |
653 | * | |
654 | * The decrement is ordered by the flush_tlb_range(), such that | |
655 | * mm_tlb_flush_pending() will not return false unless all flushes have | |
656 | * completed. | |
af2c1401 | 657 | */ |
20841405 | 658 | } |
16af97dc | 659 | |
16af97dc | 660 | static inline void dec_tlb_flush_pending(struct mm_struct *mm) |
20841405 | 661 | { |
0a2c4048 | 662 | /* |
0e709703 PZ |
663 | * See inc_tlb_flush_pending(). |
664 | * | |
665 | * This cannot be smp_mb__before_atomic() because smp_mb() simply does | |
666 | * not order against TLB invalidate completion, which is what we need. | |
667 | * | |
668 | * Therefore we must rely on tlb_flush_*() to guarantee order. | |
0a2c4048 | 669 | */ |
16af97dc | 670 | atomic_dec(&mm->tlb_flush_pending); |
20841405 | 671 | } |
20841405 | 672 | |
0e709703 PZ |
673 | static inline bool mm_tlb_flush_pending(struct mm_struct *mm) |
674 | { | |
675 | /* | |
676 | * Must be called after having acquired the PTL; orders against that | |
677 | * PTLs release and therefore ensures that if we observe the modified | |
678 | * PTE we must also observe the increment from inc_tlb_flush_pending(). | |
679 | * | |
680 | * That is, it only guarantees to return true if there is a flush | |
681 | * pending for _this_ PTL. | |
682 | */ | |
683 | return atomic_read(&mm->tlb_flush_pending); | |
684 | } | |
685 | ||
686 | static inline bool mm_tlb_flush_nested(struct mm_struct *mm) | |
687 | { | |
688 | /* | |
689 | * Similar to mm_tlb_flush_pending(), we must have acquired the PTL | |
690 | * for which there is a TLB flush pending in order to guarantee | |
691 | * we've seen both that PTE modification and the increment. | |
692 | * | |
693 | * (no requirement on actually still holding the PTL, that is irrelevant) | |
694 | */ | |
695 | return atomic_read(&mm->tlb_flush_pending) > 1; | |
696 | } | |
697 | ||
f872f540 AL |
698 | struct vm_fault; |
699 | ||
3d353901 SJ |
700 | /** |
701 | * typedef vm_fault_t - Return type for page fault handlers. | |
702 | * | |
703 | * Page fault handlers return a bitmask of %VM_FAULT values. | |
704 | */ | |
705 | typedef __bitwise unsigned int vm_fault_t; | |
706 | ||
707 | /** | |
708 | * enum vm_fault_reason - Page fault handlers return a bitmask of | |
709 | * these values to tell the core VM what happened when handling the | |
710 | * fault. Used to decide whether a process gets delivered SIGBUS or | |
711 | * just gets major/minor fault counters bumped up. | |
712 | * | |
713 | * @VM_FAULT_OOM: Out Of Memory | |
714 | * @VM_FAULT_SIGBUS: Bad access | |
715 | * @VM_FAULT_MAJOR: Page read from storage | |
716 | * @VM_FAULT_WRITE: Special case for get_user_pages | |
717 | * @VM_FAULT_HWPOISON: Hit poisoned small page | |
718 | * @VM_FAULT_HWPOISON_LARGE: Hit poisoned large page. Index encoded | |
719 | * in upper bits | |
720 | * @VM_FAULT_SIGSEGV: segmentation fault | |
721 | * @VM_FAULT_NOPAGE: ->fault installed the pte, not return page | |
722 | * @VM_FAULT_LOCKED: ->fault locked the returned page | |
723 | * @VM_FAULT_RETRY: ->fault blocked, must retry | |
724 | * @VM_FAULT_FALLBACK: huge page fault failed, fall back to small | |
725 | * @VM_FAULT_DONE_COW: ->fault has fully handled COW | |
726 | * @VM_FAULT_NEEDDSYNC: ->fault did not modify page tables and needs | |
727 | * fsync() to complete (for synchronous page faults | |
728 | * in DAX) | |
729 | * @VM_FAULT_HINDEX_MASK: mask HINDEX value | |
730 | * | |
731 | */ | |
732 | enum vm_fault_reason { | |
733 | VM_FAULT_OOM = (__force vm_fault_t)0x000001, | |
734 | VM_FAULT_SIGBUS = (__force vm_fault_t)0x000002, | |
735 | VM_FAULT_MAJOR = (__force vm_fault_t)0x000004, | |
736 | VM_FAULT_WRITE = (__force vm_fault_t)0x000008, | |
737 | VM_FAULT_HWPOISON = (__force vm_fault_t)0x000010, | |
738 | VM_FAULT_HWPOISON_LARGE = (__force vm_fault_t)0x000020, | |
739 | VM_FAULT_SIGSEGV = (__force vm_fault_t)0x000040, | |
740 | VM_FAULT_NOPAGE = (__force vm_fault_t)0x000100, | |
741 | VM_FAULT_LOCKED = (__force vm_fault_t)0x000200, | |
742 | VM_FAULT_RETRY = (__force vm_fault_t)0x000400, | |
743 | VM_FAULT_FALLBACK = (__force vm_fault_t)0x000800, | |
744 | VM_FAULT_DONE_COW = (__force vm_fault_t)0x001000, | |
745 | VM_FAULT_NEEDDSYNC = (__force vm_fault_t)0x002000, | |
746 | VM_FAULT_HINDEX_MASK = (__force vm_fault_t)0x0f0000, | |
747 | }; | |
748 | ||
749 | /* Encode hstate index for a hwpoisoned large page */ | |
750 | #define VM_FAULT_SET_HINDEX(x) ((__force vm_fault_t)((x) << 16)) | |
fcae96ff | 751 | #define VM_FAULT_GET_HINDEX(x) (((__force unsigned int)(x) >> 16) & 0xf) |
3d353901 SJ |
752 | |
753 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | \ | |
754 | VM_FAULT_SIGSEGV | VM_FAULT_HWPOISON | \ | |
755 | VM_FAULT_HWPOISON_LARGE | VM_FAULT_FALLBACK) | |
756 | ||
757 | #define VM_FAULT_RESULT_TRACE \ | |
758 | { VM_FAULT_OOM, "OOM" }, \ | |
759 | { VM_FAULT_SIGBUS, "SIGBUS" }, \ | |
760 | { VM_FAULT_MAJOR, "MAJOR" }, \ | |
761 | { VM_FAULT_WRITE, "WRITE" }, \ | |
762 | { VM_FAULT_HWPOISON, "HWPOISON" }, \ | |
763 | { VM_FAULT_HWPOISON_LARGE, "HWPOISON_LARGE" }, \ | |
764 | { VM_FAULT_SIGSEGV, "SIGSEGV" }, \ | |
765 | { VM_FAULT_NOPAGE, "NOPAGE" }, \ | |
766 | { VM_FAULT_LOCKED, "LOCKED" }, \ | |
767 | { VM_FAULT_RETRY, "RETRY" }, \ | |
768 | { VM_FAULT_FALLBACK, "FALLBACK" }, \ | |
769 | { VM_FAULT_DONE_COW, "DONE_COW" }, \ | |
770 | { VM_FAULT_NEEDDSYNC, "NEEDDSYNC" } | |
771 | ||
f872f540 AL |
772 | struct vm_special_mapping { |
773 | const char *name; /* The name, e.g. "[vdso]". */ | |
774 | ||
775 | /* | |
776 | * If .fault is not provided, this points to a | |
777 | * NULL-terminated array of pages that back the special mapping. | |
778 | * | |
779 | * This must not be NULL unless .fault is provided. | |
780 | */ | |
a62c34bd | 781 | struct page **pages; |
f872f540 AL |
782 | |
783 | /* | |
784 | * If non-NULL, then this is called to resolve page faults | |
785 | * on the special mapping. If used, .pages is not checked. | |
786 | */ | |
b3ec9f33 SJ |
787 | vm_fault_t (*fault)(const struct vm_special_mapping *sm, |
788 | struct vm_area_struct *vma, | |
789 | struct vm_fault *vmf); | |
b059a453 DS |
790 | |
791 | int (*mremap)(const struct vm_special_mapping *sm, | |
792 | struct vm_area_struct *new_vma); | |
a62c34bd AL |
793 | }; |
794 | ||
d17d8f9d DH |
795 | enum tlb_flush_reason { |
796 | TLB_FLUSH_ON_TASK_SWITCH, | |
797 | TLB_REMOTE_SHOOTDOWN, | |
798 | TLB_LOCAL_SHOOTDOWN, | |
799 | TLB_LOCAL_MM_SHOOTDOWN, | |
5b74283a | 800 | TLB_REMOTE_SEND_IPI, |
d17d8f9d DH |
801 | NR_TLB_FLUSH_REASONS, |
802 | }; | |
803 | ||
bd6dace7 TH |
804 | /* |
805 | * A swap entry has to fit into a "unsigned long", as the entry is hidden | |
806 | * in the "index" field of the swapper address space. | |
807 | */ | |
808 | typedef struct { | |
809 | unsigned long val; | |
810 | } swp_entry_t; | |
811 | ||
5b99cd0e | 812 | #endif /* _LINUX_MM_TYPES_H */ |