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5b99cd0e HC |
1 | #ifndef _LINUX_MM_TYPES_H |
2 | #define _LINUX_MM_TYPES_H | |
3 | ||
4f9a58d7 | 4 | #include <linux/auxvec.h> |
5b99cd0e HC |
5 | #include <linux/types.h> |
6 | #include <linux/threads.h> | |
7 | #include <linux/list.h> | |
8 | #include <linux/spinlock.h> | |
c92ff1bd MS |
9 | #include <linux/prio_tree.h> |
10 | #include <linux/rbtree.h> | |
11 | #include <linux/rwsem.h> | |
12 | #include <linux/completion.h> | |
cddb8a5c | 13 | #include <linux/cpumask.h> |
6a11f75b | 14 | #include <linux/page-debug-flags.h> |
d4b3b638 | 15 | #include <linux/uprobes.h> |
c92ff1bd MS |
16 | #include <asm/page.h> |
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 HC |
24 | struct address_space; |
25 | ||
f7d0b926 JF |
26 | #define USE_SPLIT_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS) |
27 | ||
5b99cd0e HC |
28 | /* |
29 | * Each physical page in the system has a struct page associated with | |
30 | * it to keep track of whatever it is we are using the page for at the | |
31 | * moment. Note that we have no way to track which tasks are using | |
32 | * a page, though if it is a pagecache page, rmap structures can tell us | |
33 | * who is mapping it. | |
fc9bb8c7 CL |
34 | * |
35 | * The objects in struct page are organized in double word blocks in | |
36 | * order to allows us to use atomic double word operations on portions | |
37 | * of struct page. That is currently only used by slub but the arrangement | |
38 | * allows the use of atomic double word operations on the flags/mapping | |
39 | * and lru list pointers also. | |
5b99cd0e HC |
40 | */ |
41 | struct page { | |
fc9bb8c7 | 42 | /* First double word block */ |
5b99cd0e HC |
43 | unsigned long flags; /* Atomic flags, some possibly |
44 | * updated asynchronously */ | |
fc9bb8c7 CL |
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 | /* Second double word */ | |
013e8963 CL |
53 | struct { |
54 | union { | |
fc9bb8c7 | 55 | pgoff_t index; /* Our offset within mapping. */ |
013e8963 CL |
56 | void *freelist; /* slub first free object */ |
57 | }; | |
58 | ||
59 | union { | |
60 | /* Used for cmpxchg_double in slub */ | |
61 | unsigned long counters; | |
62 | ||
63 | struct { | |
64 | ||
65 | union { | |
70b50f94 AA |
66 | /* |
67 | * Count of ptes mapped in | |
68 | * mms, to show when page is | |
69 | * mapped & limit reverse map | |
70 | * searches. | |
71 | * | |
72 | * Used also for tail pages | |
73 | * refcounting instead of | |
74 | * _count. Tail pages cannot | |
75 | * be mapped and keeping the | |
76 | * tail page _count zero at | |
77 | * all times guarantees | |
78 | * get_page_unless_zero() will | |
79 | * never succeed on tail | |
80 | * pages. | |
81 | */ | |
82 | atomic_t _mapcount; | |
fc9bb8c7 | 83 | |
013e8963 CL |
84 | struct { |
85 | unsigned inuse:16; | |
86 | unsigned objects:15; | |
87 | unsigned frozen:1; | |
88 | }; | |
3adf004d | 89 | }; |
013e8963 | 90 | atomic_t _count; /* Usage count, see below. */ |
fc9bb8c7 | 91 | }; |
39b26464 | 92 | }; |
81819f0f | 93 | }; |
fc9bb8c7 CL |
94 | |
95 | /* Third double word block */ | |
49e22585 CL |
96 | union { |
97 | struct list_head lru; /* Pageout list, eg. active_list | |
fc9bb8c7 CL |
98 | * protected by zone->lru_lock ! |
99 | */ | |
49e22585 CL |
100 | struct { /* slub per cpu partial pages */ |
101 | struct page *next; /* Next partial slab */ | |
102 | #ifdef CONFIG_64BIT | |
103 | int pages; /* Nr of partial slabs left */ | |
104 | int pobjects; /* Approximate # of objects */ | |
105 | #else | |
106 | short int pages; | |
107 | short int pobjects; | |
108 | #endif | |
109 | }; | |
110 | }; | |
fc9bb8c7 CL |
111 | |
112 | /* Remainder is not double word aligned */ | |
5b99cd0e | 113 | union { |
5b99cd0e HC |
114 | unsigned long private; /* Mapping-private opaque data: |
115 | * usually used for buffer_heads | |
116 | * if PagePrivate set; used for | |
117 | * swp_entry_t if PageSwapCache; | |
118 | * indicates order in the buddy | |
119 | * system if PG_buddy is set. | |
120 | */ | |
f7d0b926 | 121 | #if USE_SPLIT_PTLOCKS |
fc9bb8c7 | 122 | spinlock_t ptl; |
5b99cd0e | 123 | #endif |
fc9bb8c7 CL |
124 | struct kmem_cache *slab; /* SLUB: Pointer to slab */ |
125 | struct page *first_page; /* Compound tail pages */ | |
81819f0f | 126 | }; |
fc9bb8c7 | 127 | |
5b99cd0e HC |
128 | /* |
129 | * On machines where all RAM is mapped into kernel address space, | |
130 | * we can simply calculate the virtual address. On machines with | |
131 | * highmem some memory is mapped into kernel virtual memory | |
132 | * dynamically, so we need a place to store that address. | |
133 | * Note that this field could be 16 bits on x86 ... ;) | |
134 | * | |
135 | * Architectures with slow multiplication can define | |
136 | * WANT_PAGE_VIRTUAL in asm/page.h | |
137 | */ | |
138 | #if defined(WANT_PAGE_VIRTUAL) | |
139 | void *virtual; /* Kernel virtual address (NULL if | |
140 | not kmapped, ie. highmem) */ | |
141 | #endif /* WANT_PAGE_VIRTUAL */ | |
ee3b4290 AM |
142 | #ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS |
143 | unsigned long debug_flags; /* Use atomic bitops on this */ | |
144 | #endif | |
dfec072e VN |
145 | |
146 | #ifdef CONFIG_KMEMCHECK | |
147 | /* | |
148 | * kmemcheck wants to track the status of each byte in a page; this | |
149 | * is a pointer to such a status block. NULL if not tracked. | |
150 | */ | |
151 | void *shadow; | |
152 | #endif | |
fc9bb8c7 CL |
153 | } |
154 | /* | |
43570fd2 HC |
155 | * The struct page can be forced to be double word aligned so that atomic ops |
156 | * on double words work. The SLUB allocator can make use of such a feature. | |
fc9bb8c7 | 157 | */ |
43570fd2 HC |
158 | #ifdef CONFIG_HAVE_ALIGNED_STRUCT_PAGE |
159 | __aligned(2 * sizeof(unsigned long)) | |
fc9bb8c7 CL |
160 | #endif |
161 | ; | |
5b99cd0e | 162 | |
30d3c128 IC |
163 | struct page_frag { |
164 | struct page *page; | |
165 | #if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536) | |
166 | __u32 offset; | |
167 | __u32 size; | |
168 | #else | |
169 | __u16 offset; | |
170 | __u16 size; | |
171 | #endif | |
172 | }; | |
173 | ||
ca16d140 KM |
174 | typedef unsigned long __nocast vm_flags_t; |
175 | ||
8feae131 DH |
176 | /* |
177 | * A region containing a mapping of a non-memory backed file under NOMMU | |
178 | * conditions. These are held in a global tree and are pinned by the VMAs that | |
179 | * map parts of them. | |
180 | */ | |
181 | struct vm_region { | |
182 | struct rb_node vm_rb; /* link in global region tree */ | |
ca16d140 | 183 | vm_flags_t vm_flags; /* VMA vm_flags */ |
8feae131 DH |
184 | unsigned long vm_start; /* start address of region */ |
185 | unsigned long vm_end; /* region initialised to here */ | |
dd8632a1 | 186 | unsigned long vm_top; /* region allocated to here */ |
8feae131 DH |
187 | unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */ |
188 | struct file *vm_file; /* the backing file or NULL */ | |
189 | ||
1e2ae599 | 190 | int vm_usage; /* region usage count (access under nommu_region_sem) */ |
cfe79c00 MF |
191 | bool vm_icache_flushed : 1; /* true if the icache has been flushed for |
192 | * this region */ | |
8feae131 DH |
193 | }; |
194 | ||
c92ff1bd MS |
195 | /* |
196 | * This struct defines a memory VMM memory area. There is one of these | |
197 | * per VM-area/task. A VM area is any part of the process virtual memory | |
198 | * space that has a special rule for the page-fault handlers (ie a shared | |
199 | * library, the executable area etc). | |
200 | */ | |
201 | struct vm_area_struct { | |
202 | struct mm_struct * vm_mm; /* The address space we belong to. */ | |
203 | unsigned long vm_start; /* Our start address within vm_mm. */ | |
204 | unsigned long vm_end; /* The first byte after our end address | |
205 | within vm_mm. */ | |
206 | ||
207 | /* linked list of VM areas per task, sorted by address */ | |
297c5eee | 208 | struct vm_area_struct *vm_next, *vm_prev; |
c92ff1bd MS |
209 | |
210 | pgprot_t vm_page_prot; /* Access permissions of this VMA. */ | |
605d9288 | 211 | unsigned long vm_flags; /* Flags, see mm.h. */ |
c92ff1bd MS |
212 | |
213 | struct rb_node vm_rb; | |
214 | ||
215 | /* | |
216 | * For areas with an address space and backing store, | |
217 | * linkage into the address_space->i_mmap prio tree, or | |
218 | * linkage to the list of like vmas hanging off its node, or | |
219 | * linkage of vma in the address_space->i_mmap_nonlinear list. | |
220 | */ | |
221 | union { | |
222 | struct { | |
223 | struct list_head list; | |
224 | void *parent; /* aligns with prio_tree_node parent */ | |
225 | struct vm_area_struct *head; | |
226 | } vm_set; | |
227 | ||
228 | struct raw_prio_tree_node prio_tree_node; | |
229 | } shared; | |
230 | ||
231 | /* | |
232 | * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma | |
233 | * list, after a COW of one of the file pages. A MAP_SHARED vma | |
234 | * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack | |
235 | * or brk vma (with NULL file) can only be in an anon_vma list. | |
236 | */ | |
5beb4930 RR |
237 | struct list_head anon_vma_chain; /* Serialized by mmap_sem & |
238 | * page_table_lock */ | |
c92ff1bd MS |
239 | struct anon_vma *anon_vma; /* Serialized by page_table_lock */ |
240 | ||
241 | /* Function pointers to deal with this struct. */ | |
f0f37e2f | 242 | const struct vm_operations_struct *vm_ops; |
c92ff1bd MS |
243 | |
244 | /* Information about our backing store: */ | |
245 | unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE | |
246 | units, *not* PAGE_CACHE_SIZE */ | |
247 | struct file * vm_file; /* File we map to (can be NULL). */ | |
248 | void * vm_private_data; /* was vm_pte (shared mem) */ | |
c92ff1bd MS |
249 | |
250 | #ifndef CONFIG_MMU | |
8feae131 | 251 | struct vm_region *vm_region; /* NOMMU mapping region */ |
c92ff1bd MS |
252 | #endif |
253 | #ifdef CONFIG_NUMA | |
254 | struct mempolicy *vm_policy; /* NUMA policy for the VMA */ | |
255 | #endif | |
256 | }; | |
257 | ||
b564daf8 ON |
258 | struct core_thread { |
259 | struct task_struct *task; | |
260 | struct core_thread *next; | |
261 | }; | |
262 | ||
32ecb1f2 | 263 | struct core_state { |
c5f1cc8c | 264 | atomic_t nr_threads; |
b564daf8 | 265 | struct core_thread dumper; |
32ecb1f2 ON |
266 | struct completion startup; |
267 | }; | |
268 | ||
d559db08 KH |
269 | enum { |
270 | MM_FILEPAGES, | |
271 | MM_ANONPAGES, | |
b084d435 | 272 | MM_SWAPENTS, |
d559db08 KH |
273 | NR_MM_COUNTERS |
274 | }; | |
275 | ||
53bddb4e | 276 | #if USE_SPLIT_PTLOCKS && defined(CONFIG_MMU) |
34e55232 | 277 | #define SPLIT_RSS_COUNTING |
34e55232 KH |
278 | /* per-thread cached information, */ |
279 | struct task_rss_stat { | |
280 | int events; /* for synchronization threshold */ | |
281 | int count[NR_MM_COUNTERS]; | |
282 | }; | |
172703b0 MF |
283 | #endif /* USE_SPLIT_PTLOCKS */ |
284 | ||
d559db08 | 285 | struct mm_rss_stat { |
172703b0 | 286 | atomic_long_t count[NR_MM_COUNTERS]; |
d559db08 | 287 | }; |
d559db08 | 288 | |
c92ff1bd MS |
289 | struct mm_struct { |
290 | struct vm_area_struct * mmap; /* list of VMAs */ | |
291 | struct rb_root mm_rb; | |
292 | struct vm_area_struct * mmap_cache; /* last find_vma result */ | |
efc1a3b1 | 293 | #ifdef CONFIG_MMU |
c92ff1bd MS |
294 | unsigned long (*get_unmapped_area) (struct file *filp, |
295 | unsigned long addr, unsigned long len, | |
296 | unsigned long pgoff, unsigned long flags); | |
297 | void (*unmap_area) (struct mm_struct *mm, unsigned long addr); | |
efc1a3b1 | 298 | #endif |
c92ff1bd MS |
299 | unsigned long mmap_base; /* base of mmap area */ |
300 | unsigned long task_size; /* size of task vm space */ | |
301 | unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ | |
302 | unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ | |
303 | pgd_t * pgd; | |
304 | atomic_t mm_users; /* How many users with user space? */ | |
305 | atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ | |
306 | int map_count; /* number of VMAs */ | |
481b4bb5 | 307 | |
c92ff1bd | 308 | spinlock_t page_table_lock; /* Protects page tables and some counters */ |
481b4bb5 | 309 | struct rw_semaphore mmap_sem; |
c92ff1bd MS |
310 | |
311 | struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung | |
312 | * together off init_mm.mmlist, and are protected | |
313 | * by mmlist_lock | |
314 | */ | |
315 | ||
c92ff1bd MS |
316 | |
317 | unsigned long hiwater_rss; /* High-watermark of RSS usage */ | |
318 | unsigned long hiwater_vm; /* High-water virtual memory usage */ | |
319 | ||
e10d59f2 CL |
320 | unsigned long total_vm; /* Total pages mapped */ |
321 | unsigned long locked_vm; /* Pages that have PG_mlocked set */ | |
322 | unsigned long pinned_vm; /* Refcount permanently increased */ | |
323 | unsigned long shared_vm; /* Shared pages (files) */ | |
324 | unsigned long exec_vm; /* VM_EXEC & ~VM_WRITE */ | |
325 | unsigned long stack_vm; /* VM_GROWSUP/DOWN */ | |
326 | unsigned long reserved_vm; /* VM_RESERVED|VM_IO pages */ | |
327 | unsigned long def_flags; | |
328 | unsigned long nr_ptes; /* Page table pages */ | |
c92ff1bd MS |
329 | unsigned long start_code, end_code, start_data, end_data; |
330 | unsigned long start_brk, brk, start_stack; | |
331 | unsigned long arg_start, arg_end, env_start, env_end; | |
332 | ||
333 | unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ | |
334 | ||
d559db08 KH |
335 | /* |
336 | * Special counters, in some configurations protected by the | |
337 | * page_table_lock, in other configurations by being atomic. | |
338 | */ | |
339 | struct mm_rss_stat rss_stat; | |
340 | ||
801460d0 HS |
341 | struct linux_binfmt *binfmt; |
342 | ||
6345d24d LT |
343 | cpumask_var_t cpu_vm_mask_var; |
344 | ||
c92ff1bd MS |
345 | /* Architecture-specific MM context */ |
346 | mm_context_t context; | |
347 | ||
c92ff1bd MS |
348 | unsigned long flags; /* Must use atomic bitops to access the bits */ |
349 | ||
a94e2d40 | 350 | struct core_state *core_state; /* coredumping support */ |
858f0993 | 351 | #ifdef CONFIG_AIO |
abf137dd JA |
352 | spinlock_t ioctx_lock; |
353 | struct hlist_head ioctx_list; | |
858f0993 | 354 | #endif |
cf475ad2 | 355 | #ifdef CONFIG_MM_OWNER |
4cd1a8fc KM |
356 | /* |
357 | * "owner" points to a task that is regarded as the canonical | |
358 | * user/owner of this mm. All of the following must be true in | |
359 | * order for it to be changed: | |
360 | * | |
361 | * current == mm->owner | |
362 | * current->mm != mm | |
363 | * new_owner->mm == mm | |
364 | * new_owner->alloc_lock is held | |
365 | */ | |
4d2deb40 | 366 | struct task_struct __rcu *owner; |
78fb7466 | 367 | #endif |
925d1c40 | 368 | |
925d1c40 MH |
369 | /* store ref to file /proc/<pid>/exe symlink points to */ |
370 | struct file *exe_file; | |
371 | unsigned long num_exe_file_vmas; | |
cddb8a5c AA |
372 | #ifdef CONFIG_MMU_NOTIFIER |
373 | struct mmu_notifier_mm *mmu_notifier_mm; | |
e7a00c45 AA |
374 | #endif |
375 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
376 | pgtable_t pmd_huge_pte; /* protected by page_table_lock */ | |
cddb8a5c | 377 | #endif |
6345d24d LT |
378 | #ifdef CONFIG_CPUMASK_OFFSTACK |
379 | struct cpumask cpumask_allocation; | |
380 | #endif | |
d4b3b638 | 381 | struct uprobes_state uprobes_state; |
c92ff1bd MS |
382 | }; |
383 | ||
6345d24d LT |
384 | static inline void mm_init_cpumask(struct mm_struct *mm) |
385 | { | |
386 | #ifdef CONFIG_CPUMASK_OFFSTACK | |
387 | mm->cpu_vm_mask_var = &mm->cpumask_allocation; | |
388 | #endif | |
389 | } | |
390 | ||
45e575ab | 391 | /* Future-safe accessor for struct mm_struct's cpu_vm_mask. */ |
de03c72c KM |
392 | static inline cpumask_t *mm_cpumask(struct mm_struct *mm) |
393 | { | |
394 | return mm->cpu_vm_mask_var; | |
395 | } | |
45e575ab | 396 | |
5b99cd0e | 397 | #endif /* _LINUX_MM_TYPES_H */ |