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5b99cd0e HC |
1 | #ifndef _LINUX_MM_TYPES_H |
2 | #define _LINUX_MM_TYPES_H | |
3 | ||
2e58f173 IM |
4 | #include <linux/mm_types_task.h> |
5 | ||
4f9a58d7 | 6 | #include <linux/auxvec.h> |
5b99cd0e HC |
7 | #include <linux/list.h> |
8 | #include <linux/spinlock.h> | |
c92ff1bd MS |
9 | #include <linux/rbtree.h> |
10 | #include <linux/rwsem.h> | |
11 | #include <linux/completion.h> | |
cddb8a5c | 12 | #include <linux/cpumask.h> |
d4b3b638 | 13 | #include <linux/uprobes.h> |
bbeae5b0 | 14 | #include <linux/page-flags-layout.h> |
ec8d7c14 | 15 | #include <linux/workqueue.h> |
2e58f173 | 16 | |
c92ff1bd | 17 | #include <asm/mmu.h> |
5b99cd0e | 18 | |
4f9a58d7 OH |
19 | #ifndef AT_VECTOR_SIZE_ARCH |
20 | #define AT_VECTOR_SIZE_ARCH 0 | |
21 | #endif | |
22 | #define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1)) | |
23 | ||
5b99cd0e | 24 | struct address_space; |
1306a85a | 25 | struct mem_cgroup; |
5b99cd0e HC |
26 | |
27 | /* | |
28 | * Each physical page in the system has a struct page associated with | |
29 | * it to keep track of whatever it is we are using the page for at the | |
30 | * moment. Note that we have no way to track which tasks are using | |
31 | * a page, though if it is a pagecache page, rmap structures can tell us | |
32 | * who is mapping it. | |
fc9bb8c7 CL |
33 | * |
34 | * The objects in struct page are organized in double word blocks in | |
35 | * order to allows us to use atomic double word operations on portions | |
36 | * of struct page. That is currently only used by slub but the arrangement | |
37 | * allows the use of atomic double word operations on the flags/mapping | |
38 | * and lru list pointers also. | |
5b99cd0e HC |
39 | */ |
40 | struct page { | |
fc9bb8c7 | 41 | /* First double word block */ |
5b99cd0e HC |
42 | unsigned long flags; /* Atomic flags, some possibly |
43 | * updated asynchronously */ | |
8456a648 JK |
44 | union { |
45 | struct address_space *mapping; /* If low bit clear, points to | |
46 | * inode address_space, or NULL. | |
47 | * If page mapped as anonymous | |
48 | * memory, low bit is set, and | |
49 | * it points to anon_vma object: | |
50 | * see PAGE_MAPPING_ANON below. | |
51 | */ | |
52 | void *s_mem; /* slab first object */ | |
53f9263b | 53 | atomic_t compound_mapcount; /* first tail page */ |
9a982250 | 54 | /* page_deferred_list().next -- second tail page */ |
8456a648 JK |
55 | }; |
56 | ||
fc9bb8c7 | 57 | /* Second double word */ |
99691add VD |
58 | union { |
59 | pgoff_t index; /* Our offset within mapping. */ | |
60 | void *freelist; /* sl[aou]b first free object */ | |
61 | /* page_deferred_list().prev -- second tail page */ | |
62 | }; | |
013e8963 | 63 | |
99691add | 64 | union { |
abca7c49 PS |
65 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
66 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) | |
99691add VD |
67 | /* Used for cmpxchg_double in slub */ |
68 | unsigned long counters; | |
abca7c49 | 69 | #else |
99691add VD |
70 | /* |
71 | * Keep _refcount separate from slub cmpxchg_double data. | |
72 | * As the rest of the double word is protected by slab_lock | |
73 | * but _refcount is not. | |
74 | */ | |
75 | unsigned counters; | |
abca7c49 | 76 | #endif |
99691add | 77 | struct { |
013e8963 | 78 | |
99691add | 79 | union { |
0139aa7b | 80 | /* |
99691add VD |
81 | * Count of ptes mapped in mms, to show when |
82 | * page is mapped & limit reverse map searches. | |
632c0a1a VD |
83 | * |
84 | * Extra information about page type may be | |
85 | * stored here for pages that are never mapped, | |
86 | * in which case the value MUST BE <= -2. | |
87 | * See page-flags.h for more details. | |
0139aa7b | 88 | */ |
99691add VD |
89 | atomic_t _mapcount; |
90 | ||
91 | unsigned int active; /* SLAB */ | |
92 | struct { /* SLUB */ | |
93 | unsigned inuse:16; | |
94 | unsigned objects:15; | |
95 | unsigned frozen:1; | |
96 | }; | |
97 | int units; /* SLOB */ | |
fc9bb8c7 | 98 | }; |
99691add VD |
99 | /* |
100 | * Usage count, *USE WRAPPER FUNCTION* when manual | |
101 | * accounting. See page_ref.h | |
102 | */ | |
103 | atomic_t _refcount; | |
39b26464 | 104 | }; |
81819f0f | 105 | }; |
fc9bb8c7 | 106 | |
1d798ca3 KS |
107 | /* |
108 | * Third double word block | |
109 | * | |
110 | * WARNING: bit 0 of the first word encode PageTail(). That means | |
111 | * the rest users of the storage space MUST NOT use the bit to | |
112 | * avoid collision and false-positive PageTail(). | |
113 | */ | |
49e22585 CL |
114 | union { |
115 | struct list_head lru; /* Pageout list, eg. active_list | |
a52633d8 | 116 | * protected by zone_lru_lock ! |
34bf6ef9 DH |
117 | * Can be used as a generic list |
118 | * by the page owner. | |
fc9bb8c7 | 119 | */ |
5c2c2587 DW |
120 | struct dev_pagemap *pgmap; /* ZONE_DEVICE pages are never on an |
121 | * lru or handled by a slab | |
122 | * allocator, this points to the | |
123 | * hosting device page map. | |
124 | */ | |
49e22585 CL |
125 | struct { /* slub per cpu partial pages */ |
126 | struct page *next; /* Next partial slab */ | |
127 | #ifdef CONFIG_64BIT | |
128 | int pages; /* Nr of partial slabs left */ | |
129 | int pobjects; /* Approximate # of objects */ | |
130 | #else | |
131 | short int pages; | |
132 | short int pobjects; | |
133 | #endif | |
134 | }; | |
b8c24c4a | 135 | |
68126702 JK |
136 | struct rcu_head rcu_head; /* Used by SLAB |
137 | * when destroying via RCU | |
138 | */ | |
1d798ca3 | 139 | /* Tail pages of compound page */ |
e4b294c2 | 140 | struct { |
1d798ca3 KS |
141 | unsigned long compound_head; /* If bit zero is set */ |
142 | ||
143 | /* First tail page only */ | |
1965c8b7 KS |
144 | #ifdef CONFIG_64BIT |
145 | /* | |
146 | * On 64 bit system we have enough space in struct page | |
147 | * to encode compound_dtor and compound_order with | |
148 | * unsigned int. It can help compiler generate better or | |
149 | * smaller code on some archtectures. | |
150 | */ | |
151 | unsigned int compound_dtor; | |
152 | unsigned int compound_order; | |
153 | #else | |
f1e61557 KS |
154 | unsigned short int compound_dtor; |
155 | unsigned short int compound_order; | |
1965c8b7 | 156 | #endif |
e4b294c2 KS |
157 | }; |
158 | ||
7aa555bf | 159 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && USE_SPLIT_PMD_PTLOCKS |
1d798ca3 KS |
160 | struct { |
161 | unsigned long __pad; /* do not overlay pmd_huge_pte | |
162 | * with compound_head to avoid | |
163 | * possible bit 0 collision. | |
164 | */ | |
165 | pgtable_t pmd_huge_pte; /* protected by page->ptl */ | |
166 | }; | |
7aa555bf | 167 | #endif |
49e22585 | 168 | }; |
fc9bb8c7 CL |
169 | |
170 | /* Remainder is not double word aligned */ | |
5b99cd0e | 171 | union { |
5b99cd0e HC |
172 | unsigned long private; /* Mapping-private opaque data: |
173 | * usually used for buffer_heads | |
174 | * if PagePrivate set; used for | |
175 | * swp_entry_t if PageSwapCache; | |
176 | * indicates order in the buddy | |
177 | * system if PG_buddy is set. | |
178 | */ | |
57c1ffce | 179 | #if USE_SPLIT_PTE_PTLOCKS |
597d795a | 180 | #if ALLOC_SPLIT_PTLOCKS |
539edb58 PZ |
181 | spinlock_t *ptl; |
182 | #else | |
183 | spinlock_t ptl; | |
184 | #endif | |
5b99cd0e | 185 | #endif |
1b4f59e3 | 186 | struct kmem_cache *slab_cache; /* SL[AU]B: Pointer to slab */ |
81819f0f | 187 | }; |
fc9bb8c7 | 188 | |
1306a85a JW |
189 | #ifdef CONFIG_MEMCG |
190 | struct mem_cgroup *mem_cgroup; | |
191 | #endif | |
192 | ||
5b99cd0e HC |
193 | /* |
194 | * On machines where all RAM is mapped into kernel address space, | |
195 | * we can simply calculate the virtual address. On machines with | |
196 | * highmem some memory is mapped into kernel virtual memory | |
197 | * dynamically, so we need a place to store that address. | |
198 | * Note that this field could be 16 bits on x86 ... ;) | |
199 | * | |
200 | * Architectures with slow multiplication can define | |
201 | * WANT_PAGE_VIRTUAL in asm/page.h | |
202 | */ | |
203 | #if defined(WANT_PAGE_VIRTUAL) | |
204 | void *virtual; /* Kernel virtual address (NULL if | |
205 | not kmapped, ie. highmem) */ | |
206 | #endif /* WANT_PAGE_VIRTUAL */ | |
dfec072e VN |
207 | |
208 | #ifdef CONFIG_KMEMCHECK | |
209 | /* | |
210 | * kmemcheck wants to track the status of each byte in a page; this | |
211 | * is a pointer to such a status block. NULL if not tracked. | |
212 | */ | |
213 | void *shadow; | |
214 | #endif | |
57e0a030 | 215 | |
90572890 PZ |
216 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
217 | int _last_cpupid; | |
57e0a030 | 218 | #endif |
fc9bb8c7 CL |
219 | } |
220 | /* | |
43570fd2 HC |
221 | * The struct page can be forced to be double word aligned so that atomic ops |
222 | * on double words work. The SLUB allocator can make use of such a feature. | |
fc9bb8c7 | 223 | */ |
43570fd2 HC |
224 | #ifdef CONFIG_HAVE_ALIGNED_STRUCT_PAGE |
225 | __aligned(2 * sizeof(unsigned long)) | |
fc9bb8c7 CL |
226 | #endif |
227 | ; | |
5b99cd0e | 228 | |
b63ae8ca AD |
229 | #define PAGE_FRAG_CACHE_MAX_SIZE __ALIGN_MASK(32768, ~PAGE_MASK) |
230 | #define PAGE_FRAG_CACHE_MAX_ORDER get_order(PAGE_FRAG_CACHE_MAX_SIZE) | |
231 | ||
232 | struct page_frag_cache { | |
233 | void * va; | |
234 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
235 | __u16 offset; | |
236 | __u16 size; | |
237 | #else | |
238 | __u32 offset; | |
239 | #endif | |
240 | /* we maintain a pagecount bias, so that we dont dirty cache line | |
0139aa7b | 241 | * containing page->_refcount every time we allocate a fragment. |
b63ae8ca AD |
242 | */ |
243 | unsigned int pagecnt_bias; | |
244 | bool pfmemalloc; | |
245 | }; | |
246 | ||
64b990d2 | 247 | typedef unsigned long vm_flags_t; |
ca16d140 | 248 | |
8feae131 DH |
249 | /* |
250 | * A region containing a mapping of a non-memory backed file under NOMMU | |
251 | * conditions. These are held in a global tree and are pinned by the VMAs that | |
252 | * map parts of them. | |
253 | */ | |
254 | struct vm_region { | |
255 | struct rb_node vm_rb; /* link in global region tree */ | |
ca16d140 | 256 | vm_flags_t vm_flags; /* VMA vm_flags */ |
8feae131 DH |
257 | unsigned long vm_start; /* start address of region */ |
258 | unsigned long vm_end; /* region initialised to here */ | |
dd8632a1 | 259 | unsigned long vm_top; /* region allocated to here */ |
8feae131 DH |
260 | unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */ |
261 | struct file *vm_file; /* the backing file or NULL */ | |
262 | ||
1e2ae599 | 263 | int vm_usage; /* region usage count (access under nommu_region_sem) */ |
cfe79c00 MF |
264 | bool vm_icache_flushed : 1; /* true if the icache has been flushed for |
265 | * this region */ | |
8feae131 DH |
266 | }; |
267 | ||
745f234b AA |
268 | #ifdef CONFIG_USERFAULTFD |
269 | #define NULL_VM_UFFD_CTX ((struct vm_userfaultfd_ctx) { NULL, }) | |
270 | struct vm_userfaultfd_ctx { | |
271 | struct userfaultfd_ctx *ctx; | |
272 | }; | |
273 | #else /* CONFIG_USERFAULTFD */ | |
274 | #define NULL_VM_UFFD_CTX ((struct vm_userfaultfd_ctx) {}) | |
275 | struct vm_userfaultfd_ctx {}; | |
276 | #endif /* CONFIG_USERFAULTFD */ | |
277 | ||
c92ff1bd MS |
278 | /* |
279 | * This struct defines a memory VMM memory area. There is one of these | |
280 | * per VM-area/task. A VM area is any part of the process virtual memory | |
281 | * space that has a special rule for the page-fault handlers (ie a shared | |
282 | * library, the executable area etc). | |
283 | */ | |
284 | struct vm_area_struct { | |
e4c6bfd2 RR |
285 | /* The first cache line has the info for VMA tree walking. */ |
286 | ||
c92ff1bd MS |
287 | unsigned long vm_start; /* Our start address within vm_mm. */ |
288 | unsigned long vm_end; /* The first byte after our end address | |
289 | within vm_mm. */ | |
290 | ||
291 | /* linked list of VM areas per task, sorted by address */ | |
297c5eee | 292 | struct vm_area_struct *vm_next, *vm_prev; |
c92ff1bd | 293 | |
c92ff1bd MS |
294 | struct rb_node vm_rb; |
295 | ||
d3737187 ML |
296 | /* |
297 | * Largest free memory gap in bytes to the left of this VMA. | |
298 | * Either between this VMA and vma->vm_prev, or between one of the | |
299 | * VMAs below us in the VMA rbtree and its ->vm_prev. This helps | |
300 | * get_unmapped_area find a free area of the right size. | |
301 | */ | |
302 | unsigned long rb_subtree_gap; | |
303 | ||
e4c6bfd2 RR |
304 | /* Second cache line starts here. */ |
305 | ||
306 | struct mm_struct *vm_mm; /* The address space we belong to. */ | |
307 | pgprot_t vm_page_prot; /* Access permissions of this VMA. */ | |
308 | unsigned long vm_flags; /* Flags, see mm.h. */ | |
309 | ||
c92ff1bd MS |
310 | /* |
311 | * For areas with an address space and backing store, | |
27ba0644 | 312 | * linkage into the address_space->i_mmap interval tree. |
c92ff1bd | 313 | */ |
ac51b934 KS |
314 | struct { |
315 | struct rb_node rb; | |
316 | unsigned long rb_subtree_last; | |
c92ff1bd MS |
317 | } shared; |
318 | ||
319 | /* | |
320 | * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma | |
321 | * list, after a COW of one of the file pages. A MAP_SHARED vma | |
322 | * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack | |
323 | * or brk vma (with NULL file) can only be in an anon_vma list. | |
324 | */ | |
5beb4930 RR |
325 | struct list_head anon_vma_chain; /* Serialized by mmap_sem & |
326 | * page_table_lock */ | |
c92ff1bd MS |
327 | struct anon_vma *anon_vma; /* Serialized by page_table_lock */ |
328 | ||
329 | /* Function pointers to deal with this struct. */ | |
f0f37e2f | 330 | const struct vm_operations_struct *vm_ops; |
c92ff1bd MS |
331 | |
332 | /* Information about our backing store: */ | |
333 | unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE | |
ea1754a0 | 334 | units */ |
c92ff1bd MS |
335 | struct file * vm_file; /* File we map to (can be NULL). */ |
336 | void * vm_private_data; /* was vm_pte (shared mem) */ | |
c92ff1bd MS |
337 | |
338 | #ifndef CONFIG_MMU | |
8feae131 | 339 | struct vm_region *vm_region; /* NOMMU mapping region */ |
c92ff1bd MS |
340 | #endif |
341 | #ifdef CONFIG_NUMA | |
342 | struct mempolicy *vm_policy; /* NUMA policy for the VMA */ | |
343 | #endif | |
745f234b | 344 | struct vm_userfaultfd_ctx vm_userfaultfd_ctx; |
3859a271 | 345 | } __randomize_layout; |
c92ff1bd | 346 | |
b564daf8 ON |
347 | struct core_thread { |
348 | struct task_struct *task; | |
349 | struct core_thread *next; | |
350 | }; | |
351 | ||
32ecb1f2 | 352 | struct core_state { |
c5f1cc8c | 353 | atomic_t nr_threads; |
b564daf8 | 354 | struct core_thread dumper; |
32ecb1f2 ON |
355 | struct completion startup; |
356 | }; | |
357 | ||
db446a08 | 358 | struct kioctx_table; |
c92ff1bd | 359 | struct mm_struct { |
615d6e87 | 360 | struct vm_area_struct *mmap; /* list of VMAs */ |
c92ff1bd | 361 | struct rb_root mm_rb; |
615d6e87 | 362 | u32 vmacache_seqnum; /* per-thread vmacache */ |
efc1a3b1 | 363 | #ifdef CONFIG_MMU |
c92ff1bd MS |
364 | unsigned long (*get_unmapped_area) (struct file *filp, |
365 | unsigned long addr, unsigned long len, | |
366 | unsigned long pgoff, unsigned long flags); | |
efc1a3b1 | 367 | #endif |
c92ff1bd | 368 | unsigned long mmap_base; /* base of mmap area */ |
41aacc1e | 369 | unsigned long mmap_legacy_base; /* base of mmap area in bottom-up allocations */ |
1b028f78 DS |
370 | #ifdef CONFIG_HAVE_ARCH_COMPAT_MMAP_BASES |
371 | /* Base adresses for compatible mmap() */ | |
372 | unsigned long mmap_compat_base; | |
373 | unsigned long mmap_compat_legacy_base; | |
374 | #endif | |
c92ff1bd | 375 | unsigned long task_size; /* size of task vm space */ |
d3737187 | 376 | unsigned long highest_vm_end; /* highest vma end address */ |
c92ff1bd | 377 | pgd_t * pgd; |
b279ddc3 VN |
378 | |
379 | /** | |
380 | * @mm_users: The number of users including userspace. | |
381 | * | |
382 | * Use mmget()/mmget_not_zero()/mmput() to modify. When this drops | |
383 | * to 0 (i.e. when the task exits and there are no other temporary | |
384 | * reference holders), we also release a reference on @mm_count | |
385 | * (which may then free the &struct mm_struct if @mm_count also | |
386 | * drops to 0). | |
387 | */ | |
388 | atomic_t mm_users; | |
389 | ||
390 | /** | |
391 | * @mm_count: The number of references to &struct mm_struct | |
392 | * (@mm_users count as 1). | |
393 | * | |
394 | * Use mmgrab()/mmdrop() to modify. When this drops to 0, the | |
395 | * &struct mm_struct is freed. | |
396 | */ | |
397 | atomic_t mm_count; | |
398 | ||
dc6c9a35 | 399 | atomic_long_t nr_ptes; /* PTE page table pages */ |
5a3fbef3 | 400 | #if CONFIG_PGTABLE_LEVELS > 2 |
dc6c9a35 | 401 | atomic_long_t nr_pmds; /* PMD page table pages */ |
5a3fbef3 | 402 | #endif |
c92ff1bd | 403 | int map_count; /* number of VMAs */ |
481b4bb5 | 404 | |
c92ff1bd | 405 | spinlock_t page_table_lock; /* Protects page tables and some counters */ |
481b4bb5 | 406 | struct rw_semaphore mmap_sem; |
c92ff1bd MS |
407 | |
408 | struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung | |
409 | * together off init_mm.mmlist, and are protected | |
410 | * by mmlist_lock | |
411 | */ | |
412 | ||
c92ff1bd MS |
413 | |
414 | unsigned long hiwater_rss; /* High-watermark of RSS usage */ | |
415 | unsigned long hiwater_vm; /* High-water virtual memory usage */ | |
416 | ||
e10d59f2 CL |
417 | unsigned long total_vm; /* Total pages mapped */ |
418 | unsigned long locked_vm; /* Pages that have PG_mlocked set */ | |
419 | unsigned long pinned_vm; /* Refcount permanently increased */ | |
30bdbb78 KK |
420 | unsigned long data_vm; /* VM_WRITE & ~VM_SHARED & ~VM_STACK */ |
421 | unsigned long exec_vm; /* VM_EXEC & ~VM_WRITE & ~VM_STACK */ | |
422 | unsigned long stack_vm; /* VM_STACK */ | |
e10d59f2 | 423 | unsigned long def_flags; |
c92ff1bd MS |
424 | unsigned long start_code, end_code, start_data, end_data; |
425 | unsigned long start_brk, brk, start_stack; | |
426 | unsigned long arg_start, arg_end, env_start, env_end; | |
427 | ||
428 | unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ | |
429 | ||
d559db08 KH |
430 | /* |
431 | * Special counters, in some configurations protected by the | |
432 | * page_table_lock, in other configurations by being atomic. | |
433 | */ | |
434 | struct mm_rss_stat rss_stat; | |
435 | ||
801460d0 HS |
436 | struct linux_binfmt *binfmt; |
437 | ||
6345d24d LT |
438 | cpumask_var_t cpu_vm_mask_var; |
439 | ||
c92ff1bd MS |
440 | /* Architecture-specific MM context */ |
441 | mm_context_t context; | |
442 | ||
c92ff1bd MS |
443 | unsigned long flags; /* Must use atomic bitops to access the bits */ |
444 | ||
a94e2d40 | 445 | struct core_state *core_state; /* coredumping support */ |
858f0993 | 446 | #ifdef CONFIG_AIO |
db446a08 BL |
447 | spinlock_t ioctx_lock; |
448 | struct kioctx_table __rcu *ioctx_table; | |
858f0993 | 449 | #endif |
f98bafa0 | 450 | #ifdef CONFIG_MEMCG |
4cd1a8fc KM |
451 | /* |
452 | * "owner" points to a task that is regarded as the canonical | |
453 | * user/owner of this mm. All of the following must be true in | |
454 | * order for it to be changed: | |
455 | * | |
456 | * current == mm->owner | |
457 | * current->mm != mm | |
458 | * new_owner->mm == mm | |
459 | * new_owner->alloc_lock is held | |
460 | */ | |
4d2deb40 | 461 | struct task_struct __rcu *owner; |
78fb7466 | 462 | #endif |
bfedb589 | 463 | struct user_namespace *user_ns; |
925d1c40 | 464 | |
925d1c40 | 465 | /* store ref to file /proc/<pid>/exe symlink points to */ |
90f31d0e | 466 | struct file __rcu *exe_file; |
cddb8a5c AA |
467 | #ifdef CONFIG_MMU_NOTIFIER |
468 | struct mmu_notifier_mm *mmu_notifier_mm; | |
e7a00c45 | 469 | #endif |
e009bb30 | 470 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS |
e7a00c45 | 471 | pgtable_t pmd_huge_pte; /* protected by page_table_lock */ |
cddb8a5c | 472 | #endif |
6345d24d LT |
473 | #ifdef CONFIG_CPUMASK_OFFSTACK |
474 | struct cpumask cpumask_allocation; | |
cbee9f88 PZ |
475 | #endif |
476 | #ifdef CONFIG_NUMA_BALANCING | |
477 | /* | |
34f0315a MG |
478 | * numa_next_scan is the next time that the PTEs will be marked |
479 | * pte_numa. NUMA hinting faults will gather statistics and migrate | |
480 | * pages to new nodes if necessary. | |
cbee9f88 PZ |
481 | */ |
482 | unsigned long numa_next_scan; | |
483 | ||
6e5fb223 PZ |
484 | /* Restart point for scanning and setting pte_numa */ |
485 | unsigned long numa_scan_offset; | |
486 | ||
cbee9f88 PZ |
487 | /* numa_scan_seq prevents two threads setting pte_numa */ |
488 | int numa_scan_seq; | |
20841405 | 489 | #endif |
20841405 RR |
490 | /* |
491 | * An operation with batched TLB flushing is going on. Anything that | |
492 | * can move process memory needs to flush the TLB when moving a | |
493 | * PROT_NONE or PROT_NUMA mapped page. | |
494 | */ | |
16af97dc | 495 | atomic_t tlb_flush_pending; |
3ea27719 MG |
496 | #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH |
497 | /* See flush_tlb_batched_pending() */ | |
498 | bool tlb_flush_batched; | |
6345d24d | 499 | #endif |
d4b3b638 | 500 | struct uprobes_state uprobes_state; |
5d317b2b NH |
501 | #ifdef CONFIG_HUGETLB_PAGE |
502 | atomic_long_t hugetlb_usage; | |
503 | #endif | |
ec8d7c14 | 504 | struct work_struct async_put_work; |
3859a271 | 505 | } __randomize_layout; |
c92ff1bd | 506 | |
abe722a1 IM |
507 | extern struct mm_struct init_mm; |
508 | ||
6345d24d LT |
509 | static inline void mm_init_cpumask(struct mm_struct *mm) |
510 | { | |
511 | #ifdef CONFIG_CPUMASK_OFFSTACK | |
512 | mm->cpu_vm_mask_var = &mm->cpumask_allocation; | |
513 | #endif | |
41f727fd | 514 | cpumask_clear(mm->cpu_vm_mask_var); |
6345d24d LT |
515 | } |
516 | ||
45e575ab | 517 | /* Future-safe accessor for struct mm_struct's cpu_vm_mask. */ |
de03c72c KM |
518 | static inline cpumask_t *mm_cpumask(struct mm_struct *mm) |
519 | { | |
520 | return mm->cpu_vm_mask_var; | |
521 | } | |
45e575ab | 522 | |
56236a59 MK |
523 | struct mmu_gather; |
524 | extern void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, | |
525 | unsigned long start, unsigned long end); | |
526 | extern void tlb_finish_mmu(struct mmu_gather *tlb, | |
527 | unsigned long start, unsigned long end); | |
528 | ||
20841405 RR |
529 | /* |
530 | * Memory barriers to keep this state in sync are graciously provided by | |
531 | * the page table locks, outside of which no page table modifications happen. | |
0a2c4048 NA |
532 | * The barriers are used to ensure the order between tlb_flush_pending updates, |
533 | * which happen while the lock is not taken, and the PTE updates, which happen | |
534 | * while the lock is taken, are serialized. | |
20841405 RR |
535 | */ |
536 | static inline bool mm_tlb_flush_pending(struct mm_struct *mm) | |
537 | { | |
16af97dc | 538 | return atomic_read(&mm->tlb_flush_pending) > 0; |
20841405 | 539 | } |
16af97dc | 540 | |
99baac21 MK |
541 | /* |
542 | * Returns true if there are two above TLB batching threads in parallel. | |
543 | */ | |
544 | static inline bool mm_tlb_flush_nested(struct mm_struct *mm) | |
545 | { | |
546 | return atomic_read(&mm->tlb_flush_pending) > 1; | |
547 | } | |
548 | ||
16af97dc | 549 | static inline void init_tlb_flush_pending(struct mm_struct *mm) |
20841405 | 550 | { |
16af97dc NA |
551 | atomic_set(&mm->tlb_flush_pending, 0); |
552 | } | |
553 | ||
554 | static inline void inc_tlb_flush_pending(struct mm_struct *mm) | |
555 | { | |
556 | atomic_inc(&mm->tlb_flush_pending); | |
af2c1401 MG |
557 | |
558 | /* | |
16af97dc | 559 | * Guarantee that the tlb_flush_pending increase does not leak into the |
af2c1401 MG |
560 | * critical section updating the page tables |
561 | */ | |
562 | smp_mb__before_spinlock(); | |
20841405 | 563 | } |
16af97dc | 564 | |
20841405 | 565 | /* Clearing is done after a TLB flush, which also provides a barrier. */ |
16af97dc | 566 | static inline void dec_tlb_flush_pending(struct mm_struct *mm) |
20841405 | 567 | { |
0a2c4048 NA |
568 | /* |
569 | * Guarantee that the tlb_flush_pending does not not leak into the | |
570 | * critical section, since we must order the PTE change and changes to | |
571 | * the pending TLB flush indication. We could have relied on TLB flush | |
572 | * as a memory barrier, but this behavior is not clearly documented. | |
573 | */ | |
574 | smp_mb__before_atomic(); | |
16af97dc | 575 | atomic_dec(&mm->tlb_flush_pending); |
20841405 | 576 | } |
20841405 | 577 | |
f872f540 AL |
578 | struct vm_fault; |
579 | ||
580 | struct vm_special_mapping { | |
581 | const char *name; /* The name, e.g. "[vdso]". */ | |
582 | ||
583 | /* | |
584 | * If .fault is not provided, this points to a | |
585 | * NULL-terminated array of pages that back the special mapping. | |
586 | * | |
587 | * This must not be NULL unless .fault is provided. | |
588 | */ | |
a62c34bd | 589 | struct page **pages; |
f872f540 AL |
590 | |
591 | /* | |
592 | * If non-NULL, then this is called to resolve page faults | |
593 | * on the special mapping. If used, .pages is not checked. | |
594 | */ | |
595 | int (*fault)(const struct vm_special_mapping *sm, | |
596 | struct vm_area_struct *vma, | |
597 | struct vm_fault *vmf); | |
b059a453 DS |
598 | |
599 | int (*mremap)(const struct vm_special_mapping *sm, | |
600 | struct vm_area_struct *new_vma); | |
a62c34bd AL |
601 | }; |
602 | ||
d17d8f9d DH |
603 | enum tlb_flush_reason { |
604 | TLB_FLUSH_ON_TASK_SWITCH, | |
605 | TLB_REMOTE_SHOOTDOWN, | |
606 | TLB_LOCAL_SHOOTDOWN, | |
607 | TLB_LOCAL_MM_SHOOTDOWN, | |
5b74283a | 608 | TLB_REMOTE_SEND_IPI, |
d17d8f9d DH |
609 | NR_TLB_FLUSH_REASONS, |
610 | }; | |
611 | ||
bd6dace7 TH |
612 | /* |
613 | * A swap entry has to fit into a "unsigned long", as the entry is hidden | |
614 | * in the "index" field of the swapper address space. | |
615 | */ | |
616 | typedef struct { | |
617 | unsigned long val; | |
618 | } swp_entry_t; | |
619 | ||
5b99cd0e | 620 | #endif /* _LINUX_MM_TYPES_H */ |