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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> |
2e58f173 | 17 | |
c92ff1bd | 18 | #include <asm/mmu.h> |
5b99cd0e | 19 | |
4f9a58d7 OH |
20 | #ifndef AT_VECTOR_SIZE_ARCH |
21 | #define AT_VECTOR_SIZE_ARCH 0 | |
22 | #endif | |
23 | #define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1)) | |
24 | ||
1c8f4220 SJ |
25 | typedef int vm_fault_t; |
26 | ||
5b99cd0e | 27 | struct address_space; |
1306a85a | 28 | struct mem_cgroup; |
133ff0ea | 29 | struct hmm; |
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 | |
83 | * zone_lru_lock. Sometimes used as a generic list | |
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 | }; | |
98 | struct { /* slab, slob and slub */ | |
4da1984e MW |
99 | union { |
100 | struct list_head slab_list; /* uses lru */ | |
101 | struct { /* Partial pages */ | |
102 | struct page *next; | |
103 | #ifdef CONFIG_64BIT | |
104 | int pages; /* Nr of pages left */ | |
105 | int pobjects; /* Approximate count */ | |
106 | #else | |
107 | short int pages; | |
108 | short int pobjects; | |
109 | #endif | |
110 | }; | |
111 | }; | |
66a6ffd2 MW |
112 | struct kmem_cache *slab_cache; /* not slob */ |
113 | /* Double-word boundary */ | |
114 | void *freelist; /* first free object */ | |
115 | union { | |
116 | void *s_mem; /* slab: first object */ | |
117 | unsigned long counters; /* SLUB */ | |
118 | struct { /* SLUB */ | |
119 | unsigned inuse:16; | |
120 | unsigned objects:15; | |
121 | unsigned frozen:1; | |
122 | }; | |
123 | }; | |
124 | }; | |
4da1984e MW |
125 | struct { /* Tail pages of compound page */ |
126 | unsigned long compound_head; /* Bit zero is set */ | |
127 | ||
128 | /* First tail page only */ | |
129 | unsigned char compound_dtor; | |
130 | unsigned char compound_order; | |
131 | atomic_t compound_mapcount; | |
132 | }; | |
133 | struct { /* Second tail page of compound page */ | |
134 | unsigned long _compound_pad_1; /* compound_head */ | |
135 | unsigned long _compound_pad_2; | |
136 | struct list_head deferred_list; | |
137 | }; | |
66a6ffd2 | 138 | struct { /* Page table pages */ |
4da1984e MW |
139 | unsigned long _pt_pad_1; /* compound_head */ |
140 | pgtable_t pmd_huge_pte; /* protected by page->ptl */ | |
66a6ffd2 | 141 | unsigned long _pt_pad_2; /* mapping */ |
4231aba0 NP |
142 | union { |
143 | struct mm_struct *pt_mm; /* x86 pgds only */ | |
144 | atomic_t pt_frag_refcount; /* powerpc */ | |
145 | }; | |
7d27a04b | 146 | #if ALLOC_SPLIT_PTLOCKS |
66a6ffd2 | 147 | spinlock_t *ptl; |
7d27a04b | 148 | #else |
66a6ffd2 | 149 | spinlock_t ptl; |
7d27a04b | 150 | #endif |
7d27a04b | 151 | }; |
50e7fbc3 MW |
152 | struct { /* ZONE_DEVICE pages */ |
153 | /** @pgmap: Points to the hosting device page map. */ | |
154 | struct dev_pagemap *pgmap; | |
155 | unsigned long hmm_data; | |
156 | unsigned long _zd_pad_1; /* uses mapping */ | |
157 | }; | |
4da1984e MW |
158 | |
159 | /** @rcu_head: You can use this to free a page by RCU. */ | |
160 | struct rcu_head rcu_head; | |
7d27a04b MW |
161 | }; |
162 | ||
b21999da MW |
163 | union { /* This union is 4 bytes in size. */ |
164 | /* | |
165 | * If the page can be mapped to userspace, encodes the number | |
166 | * of times this page is referenced by a page table. | |
167 | */ | |
168 | atomic_t _mapcount; | |
169 | ||
6e292b9b MW |
170 | /* |
171 | * If the page is neither PageSlab nor mappable to userspace, | |
172 | * the value stored here may help determine what this page | |
173 | * is used for. See page-flags.h for a list of page types | |
174 | * which are currently stored here. | |
175 | */ | |
176 | unsigned int page_type; | |
177 | ||
ca9c88c7 | 178 | unsigned int active; /* SLAB */ |
ca9c88c7 | 179 | int units; /* SLOB */ |
81819f0f | 180 | }; |
fc9bb8c7 | 181 | |
b21999da MW |
182 | /* Usage count. *DO NOT USE DIRECTLY*. See page_ref.h */ |
183 | atomic_t _refcount; | |
184 | ||
1306a85a JW |
185 | #ifdef CONFIG_MEMCG |
186 | struct mem_cgroup *mem_cgroup; | |
187 | #endif | |
188 | ||
5b99cd0e HC |
189 | /* |
190 | * On machines where all RAM is mapped into kernel address space, | |
191 | * we can simply calculate the virtual address. On machines with | |
192 | * highmem some memory is mapped into kernel virtual memory | |
193 | * dynamically, so we need a place to store that address. | |
194 | * Note that this field could be 16 bits on x86 ... ;) | |
195 | * | |
196 | * Architectures with slow multiplication can define | |
197 | * WANT_PAGE_VIRTUAL in asm/page.h | |
198 | */ | |
199 | #if defined(WANT_PAGE_VIRTUAL) | |
200 | void *virtual; /* Kernel virtual address (NULL if | |
201 | not kmapped, ie. highmem) */ | |
202 | #endif /* WANT_PAGE_VIRTUAL */ | |
dfec072e | 203 | |
90572890 PZ |
204 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
205 | int _last_cpupid; | |
57e0a030 | 206 | #endif |
e20df2c6 | 207 | } _struct_page_alignment; |
5b99cd0e | 208 | |
d1402fc7 LG |
209 | /* |
210 | * Used for sizing the vmemmap region on some architectures | |
211 | */ | |
212 | #define STRUCT_PAGE_MAX_SHIFT (order_base_2(sizeof(struct page))) | |
213 | ||
b63ae8ca AD |
214 | #define PAGE_FRAG_CACHE_MAX_SIZE __ALIGN_MASK(32768, ~PAGE_MASK) |
215 | #define PAGE_FRAG_CACHE_MAX_ORDER get_order(PAGE_FRAG_CACHE_MAX_SIZE) | |
216 | ||
217 | struct page_frag_cache { | |
218 | void * va; | |
219 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
220 | __u16 offset; | |
221 | __u16 size; | |
222 | #else | |
223 | __u32 offset; | |
224 | #endif | |
225 | /* we maintain a pagecount bias, so that we dont dirty cache line | |
0139aa7b | 226 | * containing page->_refcount every time we allocate a fragment. |
b63ae8ca AD |
227 | */ |
228 | unsigned int pagecnt_bias; | |
229 | bool pfmemalloc; | |
230 | }; | |
231 | ||
64b990d2 | 232 | typedef unsigned long vm_flags_t; |
ca16d140 | 233 | |
8feae131 DH |
234 | /* |
235 | * A region containing a mapping of a non-memory backed file under NOMMU | |
236 | * conditions. These are held in a global tree and are pinned by the VMAs that | |
237 | * map parts of them. | |
238 | */ | |
239 | struct vm_region { | |
240 | struct rb_node vm_rb; /* link in global region tree */ | |
ca16d140 | 241 | vm_flags_t vm_flags; /* VMA vm_flags */ |
8feae131 DH |
242 | unsigned long vm_start; /* start address of region */ |
243 | unsigned long vm_end; /* region initialised to here */ | |
dd8632a1 | 244 | unsigned long vm_top; /* region allocated to here */ |
8feae131 DH |
245 | unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */ |
246 | struct file *vm_file; /* the backing file or NULL */ | |
247 | ||
1e2ae599 | 248 | int vm_usage; /* region usage count (access under nommu_region_sem) */ |
cfe79c00 MF |
249 | bool vm_icache_flushed : 1; /* true if the icache has been flushed for |
250 | * this region */ | |
8feae131 DH |
251 | }; |
252 | ||
745f234b AA |
253 | #ifdef CONFIG_USERFAULTFD |
254 | #define NULL_VM_UFFD_CTX ((struct vm_userfaultfd_ctx) { NULL, }) | |
255 | struct vm_userfaultfd_ctx { | |
256 | struct userfaultfd_ctx *ctx; | |
257 | }; | |
258 | #else /* CONFIG_USERFAULTFD */ | |
259 | #define NULL_VM_UFFD_CTX ((struct vm_userfaultfd_ctx) {}) | |
260 | struct vm_userfaultfd_ctx {}; | |
261 | #endif /* CONFIG_USERFAULTFD */ | |
262 | ||
c92ff1bd MS |
263 | /* |
264 | * This struct defines a memory VMM memory area. There is one of these | |
265 | * per VM-area/task. A VM area is any part of the process virtual memory | |
266 | * space that has a special rule for the page-fault handlers (ie a shared | |
267 | * library, the executable area etc). | |
268 | */ | |
269 | struct vm_area_struct { | |
e4c6bfd2 RR |
270 | /* The first cache line has the info for VMA tree walking. */ |
271 | ||
c92ff1bd MS |
272 | unsigned long vm_start; /* Our start address within vm_mm. */ |
273 | unsigned long vm_end; /* The first byte after our end address | |
274 | within vm_mm. */ | |
275 | ||
276 | /* linked list of VM areas per task, sorted by address */ | |
297c5eee | 277 | struct vm_area_struct *vm_next, *vm_prev; |
c92ff1bd | 278 | |
c92ff1bd MS |
279 | struct rb_node vm_rb; |
280 | ||
d3737187 ML |
281 | /* |
282 | * Largest free memory gap in bytes to the left of this VMA. | |
283 | * Either between this VMA and vma->vm_prev, or between one of the | |
284 | * VMAs below us in the VMA rbtree and its ->vm_prev. This helps | |
285 | * get_unmapped_area find a free area of the right size. | |
286 | */ | |
287 | unsigned long rb_subtree_gap; | |
288 | ||
e4c6bfd2 RR |
289 | /* Second cache line starts here. */ |
290 | ||
291 | struct mm_struct *vm_mm; /* The address space we belong to. */ | |
292 | pgprot_t vm_page_prot; /* Access permissions of this VMA. */ | |
293 | unsigned long vm_flags; /* Flags, see mm.h. */ | |
294 | ||
c92ff1bd MS |
295 | /* |
296 | * For areas with an address space and backing store, | |
27ba0644 | 297 | * linkage into the address_space->i_mmap interval tree. |
c92ff1bd | 298 | */ |
ac51b934 KS |
299 | struct { |
300 | struct rb_node rb; | |
301 | unsigned long rb_subtree_last; | |
c92ff1bd MS |
302 | } shared; |
303 | ||
304 | /* | |
305 | * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma | |
306 | * list, after a COW of one of the file pages. A MAP_SHARED vma | |
307 | * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack | |
308 | * or brk vma (with NULL file) can only be in an anon_vma list. | |
309 | */ | |
5beb4930 RR |
310 | struct list_head anon_vma_chain; /* Serialized by mmap_sem & |
311 | * page_table_lock */ | |
c92ff1bd MS |
312 | struct anon_vma *anon_vma; /* Serialized by page_table_lock */ |
313 | ||
314 | /* Function pointers to deal with this struct. */ | |
f0f37e2f | 315 | const struct vm_operations_struct *vm_ops; |
c92ff1bd MS |
316 | |
317 | /* Information about our backing store: */ | |
318 | unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE | |
ea1754a0 | 319 | units */ |
c92ff1bd MS |
320 | struct file * vm_file; /* File we map to (can be NULL). */ |
321 | void * vm_private_data; /* was vm_pte (shared mem) */ | |
c92ff1bd | 322 | |
ec560175 | 323 | atomic_long_t swap_readahead_info; |
c92ff1bd | 324 | #ifndef CONFIG_MMU |
8feae131 | 325 | struct vm_region *vm_region; /* NOMMU mapping region */ |
c92ff1bd MS |
326 | #endif |
327 | #ifdef CONFIG_NUMA | |
328 | struct mempolicy *vm_policy; /* NUMA policy for the VMA */ | |
329 | #endif | |
745f234b | 330 | struct vm_userfaultfd_ctx vm_userfaultfd_ctx; |
3859a271 | 331 | } __randomize_layout; |
c92ff1bd | 332 | |
b564daf8 ON |
333 | struct core_thread { |
334 | struct task_struct *task; | |
335 | struct core_thread *next; | |
336 | }; | |
337 | ||
32ecb1f2 | 338 | struct core_state { |
c5f1cc8c | 339 | atomic_t nr_threads; |
b564daf8 | 340 | struct core_thread dumper; |
32ecb1f2 ON |
341 | struct completion startup; |
342 | }; | |
343 | ||
db446a08 | 344 | struct kioctx_table; |
c92ff1bd | 345 | struct mm_struct { |
c1a2f7f0 RR |
346 | struct { |
347 | struct vm_area_struct *mmap; /* list of VMAs */ | |
348 | struct rb_root mm_rb; | |
7a9cdebd | 349 | u64 vmacache_seqnum; /* per-thread vmacache */ |
efc1a3b1 | 350 | #ifdef CONFIG_MMU |
c1a2f7f0 | 351 | unsigned long (*get_unmapped_area) (struct file *filp, |
c92ff1bd MS |
352 | unsigned long addr, unsigned long len, |
353 | unsigned long pgoff, unsigned long flags); | |
efc1a3b1 | 354 | #endif |
c1a2f7f0 RR |
355 | unsigned long mmap_base; /* base of mmap area */ |
356 | unsigned long mmap_legacy_base; /* base of mmap area in bottom-up allocations */ | |
1b028f78 | 357 | #ifdef CONFIG_HAVE_ARCH_COMPAT_MMAP_BASES |
c1a2f7f0 RR |
358 | /* Base adresses for compatible mmap() */ |
359 | unsigned long mmap_compat_base; | |
360 | unsigned long mmap_compat_legacy_base; | |
1b028f78 | 361 | #endif |
c1a2f7f0 RR |
362 | unsigned long task_size; /* size of task vm space */ |
363 | unsigned long highest_vm_end; /* highest vma end address */ | |
364 | pgd_t * pgd; | |
365 | ||
366 | /** | |
367 | * @mm_users: The number of users including userspace. | |
368 | * | |
369 | * Use mmget()/mmget_not_zero()/mmput() to modify. When this | |
370 | * drops to 0 (i.e. when the task exits and there are no other | |
371 | * temporary reference holders), we also release a reference on | |
372 | * @mm_count (which may then free the &struct mm_struct if | |
373 | * @mm_count also drops to 0). | |
374 | */ | |
375 | atomic_t mm_users; | |
376 | ||
377 | /** | |
378 | * @mm_count: The number of references to &struct mm_struct | |
379 | * (@mm_users count as 1). | |
380 | * | |
381 | * Use mmgrab()/mmdrop() to modify. When this drops to 0, the | |
382 | * &struct mm_struct is freed. | |
383 | */ | |
384 | atomic_t mm_count; | |
b279ddc3 | 385 | |
c4812909 | 386 | #ifdef CONFIG_MMU |
c1a2f7f0 | 387 | atomic_long_t pgtables_bytes; /* PTE page table pages */ |
5a3fbef3 | 388 | #endif |
c1a2f7f0 | 389 | int map_count; /* number of VMAs */ |
481b4bb5 | 390 | |
c1a2f7f0 RR |
391 | spinlock_t page_table_lock; /* Protects page tables and some |
392 | * counters | |
393 | */ | |
394 | struct rw_semaphore mmap_sem; | |
c92ff1bd | 395 | |
c1a2f7f0 RR |
396 | struct list_head mmlist; /* List of maybe swapped mm's. These |
397 | * are globally strung together off | |
398 | * init_mm.mmlist, and are protected | |
399 | * by mmlist_lock | |
400 | */ | |
c92ff1bd | 401 | |
c92ff1bd | 402 | |
c1a2f7f0 RR |
403 | unsigned long hiwater_rss; /* High-watermark of RSS usage */ |
404 | unsigned long hiwater_vm; /* High-water virtual memory usage */ | |
c92ff1bd | 405 | |
c1a2f7f0 RR |
406 | unsigned long total_vm; /* Total pages mapped */ |
407 | unsigned long locked_vm; /* Pages that have PG_mlocked set */ | |
408 | unsigned long pinned_vm; /* Refcount permanently increased */ | |
409 | unsigned long data_vm; /* VM_WRITE & ~VM_SHARED & ~VM_STACK */ | |
410 | unsigned long exec_vm; /* VM_EXEC & ~VM_WRITE & ~VM_STACK */ | |
411 | unsigned long stack_vm; /* VM_STACK */ | |
412 | unsigned long def_flags; | |
88aa7cc6 | 413 | |
c1a2f7f0 RR |
414 | spinlock_t arg_lock; /* protect the below fields */ |
415 | unsigned long start_code, end_code, start_data, end_data; | |
416 | unsigned long start_brk, brk, start_stack; | |
417 | unsigned long arg_start, arg_end, env_start, env_end; | |
c92ff1bd | 418 | |
c1a2f7f0 | 419 | unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ |
c92ff1bd | 420 | |
c1a2f7f0 RR |
421 | /* |
422 | * Special counters, in some configurations protected by the | |
423 | * page_table_lock, in other configurations by being atomic. | |
424 | */ | |
425 | struct mm_rss_stat rss_stat; | |
801460d0 | 426 | |
c1a2f7f0 | 427 | struct linux_binfmt *binfmt; |
6345d24d | 428 | |
c1a2f7f0 RR |
429 | /* Architecture-specific MM context */ |
430 | mm_context_t context; | |
c92ff1bd | 431 | |
c1a2f7f0 | 432 | unsigned long flags; /* Must use atomic bitops to access */ |
c92ff1bd | 433 | |
c1a2f7f0 | 434 | struct core_state *core_state; /* coredumping support */ |
a961e409 | 435 | #ifdef CONFIG_MEMBARRIER |
c1a2f7f0 | 436 | atomic_t membarrier_state; |
a961e409 | 437 | #endif |
858f0993 | 438 | #ifdef CONFIG_AIO |
c1a2f7f0 RR |
439 | spinlock_t ioctx_lock; |
440 | struct kioctx_table __rcu *ioctx_table; | |
858f0993 | 441 | #endif |
f98bafa0 | 442 | #ifdef CONFIG_MEMCG |
c1a2f7f0 RR |
443 | /* |
444 | * "owner" points to a task that is regarded as the canonical | |
445 | * user/owner of this mm. All of the following must be true in | |
446 | * order for it to be changed: | |
447 | * | |
448 | * current == mm->owner | |
449 | * current->mm != mm | |
450 | * new_owner->mm == mm | |
451 | * new_owner->alloc_lock is held | |
452 | */ | |
453 | struct task_struct __rcu *owner; | |
78fb7466 | 454 | #endif |
c1a2f7f0 | 455 | struct user_namespace *user_ns; |
925d1c40 | 456 | |
c1a2f7f0 RR |
457 | /* store ref to file /proc/<pid>/exe symlink points to */ |
458 | struct file __rcu *exe_file; | |
cddb8a5c | 459 | #ifdef CONFIG_MMU_NOTIFIER |
c1a2f7f0 | 460 | struct mmu_notifier_mm *mmu_notifier_mm; |
e7a00c45 | 461 | #endif |
e009bb30 | 462 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS |
c1a2f7f0 | 463 | pgtable_t pmd_huge_pte; /* protected by page_table_lock */ |
cbee9f88 PZ |
464 | #endif |
465 | #ifdef CONFIG_NUMA_BALANCING | |
c1a2f7f0 RR |
466 | /* |
467 | * numa_next_scan is the next time that the PTEs will be marked | |
468 | * pte_numa. NUMA hinting faults will gather statistics and | |
469 | * migrate pages to new nodes if necessary. | |
470 | */ | |
471 | unsigned long numa_next_scan; | |
cbee9f88 | 472 | |
c1a2f7f0 RR |
473 | /* Restart point for scanning and setting pte_numa */ |
474 | unsigned long numa_scan_offset; | |
6e5fb223 | 475 | |
c1a2f7f0 RR |
476 | /* numa_scan_seq prevents two threads setting pte_numa */ |
477 | int numa_scan_seq; | |
20841405 | 478 | #endif |
c1a2f7f0 RR |
479 | /* |
480 | * An operation with batched TLB flushing is going on. Anything | |
481 | * that can move process memory needs to flush the TLB when | |
482 | * moving a PROT_NONE or PROT_NUMA mapped page. | |
483 | */ | |
484 | atomic_t tlb_flush_pending; | |
3ea27719 | 485 | #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH |
c1a2f7f0 RR |
486 | /* See flush_tlb_batched_pending() */ |
487 | bool tlb_flush_batched; | |
6345d24d | 488 | #endif |
c1a2f7f0 | 489 | struct uprobes_state uprobes_state; |
5d317b2b | 490 | #ifdef CONFIG_HUGETLB_PAGE |
c1a2f7f0 | 491 | atomic_long_t hugetlb_usage; |
5d317b2b | 492 | #endif |
c1a2f7f0 | 493 | struct work_struct async_put_work; |
133ff0ea JG |
494 | |
495 | #if IS_ENABLED(CONFIG_HMM) | |
c1a2f7f0 RR |
496 | /* HMM needs to track a few things per mm */ |
497 | struct hmm *hmm; | |
133ff0ea | 498 | #endif |
c1a2f7f0 RR |
499 | } __randomize_layout; |
500 | ||
501 | /* | |
502 | * The mm_cpumask needs to be at the end of mm_struct, because it | |
503 | * is dynamically sized based on nr_cpu_ids. | |
504 | */ | |
505 | unsigned long cpu_bitmap[]; | |
506 | }; | |
c92ff1bd | 507 | |
abe722a1 IM |
508 | extern struct mm_struct init_mm; |
509 | ||
c1a2f7f0 | 510 | /* Pointer magic because the dynamic array size confuses some compilers. */ |
6345d24d LT |
511 | static inline void mm_init_cpumask(struct mm_struct *mm) |
512 | { | |
c1a2f7f0 RR |
513 | unsigned long cpu_bitmap = (unsigned long)mm; |
514 | ||
515 | cpu_bitmap += offsetof(struct mm_struct, cpu_bitmap); | |
516 | cpumask_clear((struct cpumask *)cpu_bitmap); | |
6345d24d LT |
517 | } |
518 | ||
45e575ab | 519 | /* Future-safe accessor for struct mm_struct's cpu_vm_mask. */ |
de03c72c KM |
520 | static inline cpumask_t *mm_cpumask(struct mm_struct *mm) |
521 | { | |
c1a2f7f0 | 522 | return (struct cpumask *)&mm->cpu_bitmap; |
de03c72c | 523 | } |
45e575ab | 524 | |
56236a59 MK |
525 | struct mmu_gather; |
526 | extern void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, | |
527 | unsigned long start, unsigned long end); | |
528 | extern void tlb_finish_mmu(struct mmu_gather *tlb, | |
529 | unsigned long start, unsigned long end); | |
530 | ||
16af97dc | 531 | static inline void init_tlb_flush_pending(struct mm_struct *mm) |
20841405 | 532 | { |
16af97dc | 533 | atomic_set(&mm->tlb_flush_pending, 0); |
20841405 | 534 | } |
16af97dc NA |
535 | |
536 | static inline void inc_tlb_flush_pending(struct mm_struct *mm) | |
20841405 | 537 | { |
16af97dc | 538 | atomic_inc(&mm->tlb_flush_pending); |
af2c1401 | 539 | /* |
8b1b436d PZ |
540 | * The only time this value is relevant is when there are indeed pages |
541 | * to flush. And we'll only flush pages after changing them, which | |
542 | * requires the PTL. | |
543 | * | |
544 | * So the ordering here is: | |
545 | * | |
040cca3a | 546 | * atomic_inc(&mm->tlb_flush_pending); |
8b1b436d PZ |
547 | * spin_lock(&ptl); |
548 | * ... | |
549 | * set_pte_at(); | |
550 | * spin_unlock(&ptl); | |
551 | * | |
552 | * spin_lock(&ptl) | |
553 | * mm_tlb_flush_pending(); | |
554 | * .... | |
555 | * spin_unlock(&ptl); | |
556 | * | |
557 | * flush_tlb_range(); | |
040cca3a | 558 | * atomic_dec(&mm->tlb_flush_pending); |
8b1b436d | 559 | * |
0e709703 PZ |
560 | * Where the increment if constrained by the PTL unlock, it thus |
561 | * ensures that the increment is visible if the PTE modification is | |
562 | * visible. After all, if there is no PTE modification, nobody cares | |
563 | * about TLB flushes either. | |
564 | * | |
565 | * This very much relies on users (mm_tlb_flush_pending() and | |
566 | * mm_tlb_flush_nested()) only caring about _specific_ PTEs (and | |
567 | * therefore specific PTLs), because with SPLIT_PTE_PTLOCKS and RCpc | |
568 | * locks (PPC) the unlock of one doesn't order against the lock of | |
569 | * another PTL. | |
570 | * | |
571 | * The decrement is ordered by the flush_tlb_range(), such that | |
572 | * mm_tlb_flush_pending() will not return false unless all flushes have | |
573 | * completed. | |
af2c1401 | 574 | */ |
20841405 | 575 | } |
16af97dc | 576 | |
16af97dc | 577 | static inline void dec_tlb_flush_pending(struct mm_struct *mm) |
20841405 | 578 | { |
0a2c4048 | 579 | /* |
0e709703 PZ |
580 | * See inc_tlb_flush_pending(). |
581 | * | |
582 | * This cannot be smp_mb__before_atomic() because smp_mb() simply does | |
583 | * not order against TLB invalidate completion, which is what we need. | |
584 | * | |
585 | * Therefore we must rely on tlb_flush_*() to guarantee order. | |
0a2c4048 | 586 | */ |
16af97dc | 587 | atomic_dec(&mm->tlb_flush_pending); |
20841405 | 588 | } |
20841405 | 589 | |
0e709703 PZ |
590 | static inline bool mm_tlb_flush_pending(struct mm_struct *mm) |
591 | { | |
592 | /* | |
593 | * Must be called after having acquired the PTL; orders against that | |
594 | * PTLs release and therefore ensures that if we observe the modified | |
595 | * PTE we must also observe the increment from inc_tlb_flush_pending(). | |
596 | * | |
597 | * That is, it only guarantees to return true if there is a flush | |
598 | * pending for _this_ PTL. | |
599 | */ | |
600 | return atomic_read(&mm->tlb_flush_pending); | |
601 | } | |
602 | ||
603 | static inline bool mm_tlb_flush_nested(struct mm_struct *mm) | |
604 | { | |
605 | /* | |
606 | * Similar to mm_tlb_flush_pending(), we must have acquired the PTL | |
607 | * for which there is a TLB flush pending in order to guarantee | |
608 | * we've seen both that PTE modification and the increment. | |
609 | * | |
610 | * (no requirement on actually still holding the PTL, that is irrelevant) | |
611 | */ | |
612 | return atomic_read(&mm->tlb_flush_pending) > 1; | |
613 | } | |
614 | ||
f872f540 AL |
615 | struct vm_fault; |
616 | ||
617 | struct vm_special_mapping { | |
618 | const char *name; /* The name, e.g. "[vdso]". */ | |
619 | ||
620 | /* | |
621 | * If .fault is not provided, this points to a | |
622 | * NULL-terminated array of pages that back the special mapping. | |
623 | * | |
624 | * This must not be NULL unless .fault is provided. | |
625 | */ | |
a62c34bd | 626 | struct page **pages; |
f872f540 AL |
627 | |
628 | /* | |
629 | * If non-NULL, then this is called to resolve page faults | |
630 | * on the special mapping. If used, .pages is not checked. | |
631 | */ | |
b3ec9f33 SJ |
632 | vm_fault_t (*fault)(const struct vm_special_mapping *sm, |
633 | struct vm_area_struct *vma, | |
634 | struct vm_fault *vmf); | |
b059a453 DS |
635 | |
636 | int (*mremap)(const struct vm_special_mapping *sm, | |
637 | struct vm_area_struct *new_vma); | |
a62c34bd AL |
638 | }; |
639 | ||
d17d8f9d DH |
640 | enum tlb_flush_reason { |
641 | TLB_FLUSH_ON_TASK_SWITCH, | |
642 | TLB_REMOTE_SHOOTDOWN, | |
643 | TLB_LOCAL_SHOOTDOWN, | |
644 | TLB_LOCAL_MM_SHOOTDOWN, | |
5b74283a | 645 | TLB_REMOTE_SEND_IPI, |
d17d8f9d DH |
646 | NR_TLB_FLUSH_REASONS, |
647 | }; | |
648 | ||
bd6dace7 TH |
649 | /* |
650 | * A swap entry has to fit into a "unsigned long", as the entry is hidden | |
651 | * in the "index" field of the swapper address space. | |
652 | */ | |
653 | typedef struct { | |
654 | unsigned long val; | |
655 | } swp_entry_t; | |
656 | ||
5b99cd0e | 657 | #endif /* _LINUX_MM_TYPES_H */ |