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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> |
c92ff1bd MS |
15 | #include <asm/page.h> |
16 | #include <asm/mmu.h> | |
5b99cd0e | 17 | |
4f9a58d7 OH |
18 | #ifndef AT_VECTOR_SIZE_ARCH |
19 | #define AT_VECTOR_SIZE_ARCH 0 | |
20 | #endif | |
21 | #define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1)) | |
22 | ||
5b99cd0e HC |
23 | struct address_space; |
24 | ||
f7d0b926 JF |
25 | #define USE_SPLIT_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS) |
26 | ||
27 | #if USE_SPLIT_PTLOCKS | |
c92ff1bd | 28 | typedef atomic_long_t mm_counter_t; |
f7d0b926 | 29 | #else /* !USE_SPLIT_PTLOCKS */ |
c92ff1bd | 30 | typedef unsigned long mm_counter_t; |
f7d0b926 | 31 | #endif /* !USE_SPLIT_PTLOCKS */ |
c92ff1bd | 32 | |
5b99cd0e HC |
33 | /* |
34 | * Each physical page in the system has a struct page associated with | |
35 | * it to keep track of whatever it is we are using the page for at the | |
36 | * moment. Note that we have no way to track which tasks are using | |
37 | * a page, though if it is a pagecache page, rmap structures can tell us | |
38 | * who is mapping it. | |
39 | */ | |
40 | struct page { | |
41 | unsigned long flags; /* Atomic flags, some possibly | |
42 | * updated asynchronously */ | |
43 | atomic_t _count; /* Usage count, see below. */ | |
81819f0f CL |
44 | union { |
45 | atomic_t _mapcount; /* Count of ptes mapped in mms, | |
5b99cd0e HC |
46 | * to show when page is mapped |
47 | * & limit reverse map searches. | |
48 | */ | |
39b26464 CL |
49 | struct { /* SLUB */ |
50 | u16 inuse; | |
51 | u16 objects; | |
52 | }; | |
81819f0f | 53 | }; |
5b99cd0e HC |
54 | union { |
55 | struct { | |
56 | unsigned long private; /* Mapping-private opaque data: | |
57 | * usually used for buffer_heads | |
58 | * if PagePrivate set; used for | |
59 | * swp_entry_t if PageSwapCache; | |
60 | * indicates order in the buddy | |
61 | * system if PG_buddy is set. | |
62 | */ | |
63 | struct address_space *mapping; /* If low bit clear, points to | |
64 | * inode address_space, or NULL. | |
65 | * If page mapped as anonymous | |
66 | * memory, low bit is set, and | |
67 | * it points to anon_vma object: | |
68 | * see PAGE_MAPPING_ANON below. | |
69 | */ | |
70 | }; | |
f7d0b926 | 71 | #if USE_SPLIT_PTLOCKS |
5b99cd0e HC |
72 | spinlock_t ptl; |
73 | #endif | |
a973e9dd | 74 | struct kmem_cache *slab; /* SLUB: Pointer to slab */ |
8e65d24c | 75 | struct page *first_page; /* Compound tail pages */ |
81819f0f CL |
76 | }; |
77 | union { | |
78 | pgoff_t index; /* Our offset within mapping. */ | |
894b8788 | 79 | void *freelist; /* SLUB: freelist req. slab lock */ |
5b99cd0e | 80 | }; |
5b99cd0e HC |
81 | struct list_head lru; /* Pageout list, eg. active_list |
82 | * protected by zone->lru_lock ! | |
83 | */ | |
84 | /* | |
85 | * On machines where all RAM is mapped into kernel address space, | |
86 | * we can simply calculate the virtual address. On machines with | |
87 | * highmem some memory is mapped into kernel virtual memory | |
88 | * dynamically, so we need a place to store that address. | |
89 | * Note that this field could be 16 bits on x86 ... ;) | |
90 | * | |
91 | * Architectures with slow multiplication can define | |
92 | * WANT_PAGE_VIRTUAL in asm/page.h | |
93 | */ | |
94 | #if defined(WANT_PAGE_VIRTUAL) | |
95 | void *virtual; /* Kernel virtual address (NULL if | |
96 | not kmapped, ie. highmem) */ | |
97 | #endif /* WANT_PAGE_VIRTUAL */ | |
ee3b4290 AM |
98 | #ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS |
99 | unsigned long debug_flags; /* Use atomic bitops on this */ | |
100 | #endif | |
dfec072e VN |
101 | |
102 | #ifdef CONFIG_KMEMCHECK | |
103 | /* | |
104 | * kmemcheck wants to track the status of each byte in a page; this | |
105 | * is a pointer to such a status block. NULL if not tracked. | |
106 | */ | |
107 | void *shadow; | |
108 | #endif | |
5b99cd0e HC |
109 | }; |
110 | ||
8feae131 DH |
111 | /* |
112 | * A region containing a mapping of a non-memory backed file under NOMMU | |
113 | * conditions. These are held in a global tree and are pinned by the VMAs that | |
114 | * map parts of them. | |
115 | */ | |
116 | struct vm_region { | |
117 | struct rb_node vm_rb; /* link in global region tree */ | |
118 | unsigned long vm_flags; /* VMA vm_flags */ | |
119 | unsigned long vm_start; /* start address of region */ | |
120 | unsigned long vm_end; /* region initialised to here */ | |
dd8632a1 | 121 | unsigned long vm_top; /* region allocated to here */ |
8feae131 DH |
122 | unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */ |
123 | struct file *vm_file; /* the backing file or NULL */ | |
124 | ||
1e2ae599 | 125 | int vm_usage; /* region usage count (access under nommu_region_sem) */ |
cfe79c00 MF |
126 | bool vm_icache_flushed : 1; /* true if the icache has been flushed for |
127 | * this region */ | |
8feae131 DH |
128 | }; |
129 | ||
c92ff1bd MS |
130 | /* |
131 | * This struct defines a memory VMM memory area. There is one of these | |
132 | * per VM-area/task. A VM area is any part of the process virtual memory | |
133 | * space that has a special rule for the page-fault handlers (ie a shared | |
134 | * library, the executable area etc). | |
135 | */ | |
136 | struct vm_area_struct { | |
137 | struct mm_struct * vm_mm; /* The address space we belong to. */ | |
138 | unsigned long vm_start; /* Our start address within vm_mm. */ | |
139 | unsigned long vm_end; /* The first byte after our end address | |
140 | within vm_mm. */ | |
141 | ||
142 | /* linked list of VM areas per task, sorted by address */ | |
143 | struct vm_area_struct *vm_next; | |
144 | ||
145 | pgprot_t vm_page_prot; /* Access permissions of this VMA. */ | |
605d9288 | 146 | unsigned long vm_flags; /* Flags, see mm.h. */ |
c92ff1bd MS |
147 | |
148 | struct rb_node vm_rb; | |
149 | ||
150 | /* | |
151 | * For areas with an address space and backing store, | |
152 | * linkage into the address_space->i_mmap prio tree, or | |
153 | * linkage to the list of like vmas hanging off its node, or | |
154 | * linkage of vma in the address_space->i_mmap_nonlinear list. | |
155 | */ | |
156 | union { | |
157 | struct { | |
158 | struct list_head list; | |
159 | void *parent; /* aligns with prio_tree_node parent */ | |
160 | struct vm_area_struct *head; | |
161 | } vm_set; | |
162 | ||
163 | struct raw_prio_tree_node prio_tree_node; | |
164 | } shared; | |
165 | ||
166 | /* | |
167 | * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma | |
168 | * list, after a COW of one of the file pages. A MAP_SHARED vma | |
169 | * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack | |
170 | * or brk vma (with NULL file) can only be in an anon_vma list. | |
171 | */ | |
172 | struct list_head anon_vma_node; /* Serialized by anon_vma->lock */ | |
173 | struct anon_vma *anon_vma; /* Serialized by page_table_lock */ | |
174 | ||
175 | /* Function pointers to deal with this struct. */ | |
f0f37e2f | 176 | const struct vm_operations_struct *vm_ops; |
c92ff1bd MS |
177 | |
178 | /* Information about our backing store: */ | |
179 | unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE | |
180 | units, *not* PAGE_CACHE_SIZE */ | |
181 | struct file * vm_file; /* File we map to (can be NULL). */ | |
182 | void * vm_private_data; /* was vm_pte (shared mem) */ | |
183 | unsigned long vm_truncate_count;/* truncate_count or restart_addr */ | |
184 | ||
185 | #ifndef CONFIG_MMU | |
8feae131 | 186 | struct vm_region *vm_region; /* NOMMU mapping region */ |
c92ff1bd MS |
187 | #endif |
188 | #ifdef CONFIG_NUMA | |
189 | struct mempolicy *vm_policy; /* NUMA policy for the VMA */ | |
190 | #endif | |
191 | }; | |
192 | ||
b564daf8 ON |
193 | struct core_thread { |
194 | struct task_struct *task; | |
195 | struct core_thread *next; | |
196 | }; | |
197 | ||
32ecb1f2 | 198 | struct core_state { |
c5f1cc8c | 199 | atomic_t nr_threads; |
b564daf8 | 200 | struct core_thread dumper; |
32ecb1f2 ON |
201 | struct completion startup; |
202 | }; | |
203 | ||
c92ff1bd MS |
204 | struct mm_struct { |
205 | struct vm_area_struct * mmap; /* list of VMAs */ | |
206 | struct rb_root mm_rb; | |
207 | struct vm_area_struct * mmap_cache; /* last find_vma result */ | |
efc1a3b1 | 208 | #ifdef CONFIG_MMU |
c92ff1bd MS |
209 | unsigned long (*get_unmapped_area) (struct file *filp, |
210 | unsigned long addr, unsigned long len, | |
211 | unsigned long pgoff, unsigned long flags); | |
212 | void (*unmap_area) (struct mm_struct *mm, unsigned long addr); | |
efc1a3b1 | 213 | #endif |
c92ff1bd MS |
214 | unsigned long mmap_base; /* base of mmap area */ |
215 | unsigned long task_size; /* size of task vm space */ | |
216 | unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ | |
217 | unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ | |
218 | pgd_t * pgd; | |
219 | atomic_t mm_users; /* How many users with user space? */ | |
220 | atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ | |
221 | int map_count; /* number of VMAs */ | |
222 | struct rw_semaphore mmap_sem; | |
223 | spinlock_t page_table_lock; /* Protects page tables and some counters */ | |
224 | ||
225 | struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung | |
226 | * together off init_mm.mmlist, and are protected | |
227 | * by mmlist_lock | |
228 | */ | |
229 | ||
230 | /* Special counters, in some configurations protected by the | |
231 | * page_table_lock, in other configurations by being atomic. | |
232 | */ | |
233 | mm_counter_t _file_rss; | |
234 | mm_counter_t _anon_rss; | |
235 | ||
236 | unsigned long hiwater_rss; /* High-watermark of RSS usage */ | |
237 | unsigned long hiwater_vm; /* High-water virtual memory usage */ | |
238 | ||
239 | unsigned long total_vm, locked_vm, shared_vm, exec_vm; | |
240 | unsigned long stack_vm, reserved_vm, def_flags, nr_ptes; | |
241 | unsigned long start_code, end_code, start_data, end_data; | |
242 | unsigned long start_brk, brk, start_stack; | |
243 | unsigned long arg_start, arg_end, env_start, env_end; | |
244 | ||
245 | unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ | |
246 | ||
801460d0 HS |
247 | struct linux_binfmt *binfmt; |
248 | ||
c92ff1bd MS |
249 | cpumask_t cpu_vm_mask; |
250 | ||
251 | /* Architecture-specific MM context */ | |
252 | mm_context_t context; | |
253 | ||
254 | /* Swap token stuff */ | |
255 | /* | |
256 | * Last value of global fault stamp as seen by this process. | |
257 | * In other words, this value gives an indication of how long | |
258 | * it has been since this task got the token. | |
259 | * Look at mm/thrash.c | |
260 | */ | |
261 | unsigned int faultstamp; | |
262 | unsigned int token_priority; | |
263 | unsigned int last_interval; | |
264 | ||
265 | unsigned long flags; /* Must use atomic bitops to access the bits */ | |
266 | ||
a94e2d40 | 267 | struct core_state *core_state; /* coredumping support */ |
858f0993 | 268 | #ifdef CONFIG_AIO |
abf137dd JA |
269 | spinlock_t ioctx_lock; |
270 | struct hlist_head ioctx_list; | |
858f0993 | 271 | #endif |
cf475ad2 | 272 | #ifdef CONFIG_MM_OWNER |
4cd1a8fc KM |
273 | /* |
274 | * "owner" points to a task that is regarded as the canonical | |
275 | * user/owner of this mm. All of the following must be true in | |
276 | * order for it to be changed: | |
277 | * | |
278 | * current == mm->owner | |
279 | * current->mm != mm | |
280 | * new_owner->mm == mm | |
281 | * new_owner->alloc_lock is held | |
282 | */ | |
283 | struct task_struct *owner; | |
78fb7466 | 284 | #endif |
925d1c40 MH |
285 | |
286 | #ifdef CONFIG_PROC_FS | |
287 | /* store ref to file /proc/<pid>/exe symlink points to */ | |
288 | struct file *exe_file; | |
289 | unsigned long num_exe_file_vmas; | |
290 | #endif | |
cddb8a5c AA |
291 | #ifdef CONFIG_MMU_NOTIFIER |
292 | struct mmu_notifier_mm *mmu_notifier_mm; | |
293 | #endif | |
c92ff1bd MS |
294 | }; |
295 | ||
45e575ab RR |
296 | /* Future-safe accessor for struct mm_struct's cpu_vm_mask. */ |
297 | #define mm_cpumask(mm) (&(mm)->cpu_vm_mask) | |
298 | ||
5b99cd0e | 299 | #endif /* _LINUX_MM_TYPES_H */ |