Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef __LINUX_GFP_H |
2 | #define __LINUX_GFP_H | |
3 | ||
4 | #include <linux/mmzone.h> | |
5 | #include <linux/stddef.h> | |
6 | #include <linux/linkage.h> | |
082edb7b | 7 | #include <linux/topology.h> |
6484eb3e | 8 | #include <linux/mmdebug.h> |
1da177e4 LT |
9 | |
10 | struct vm_area_struct; | |
11 | ||
12 | /* | |
13 | * GFP bitmasks.. | |
e53ef38d CL |
14 | * |
15 | * Zone modifiers (see linux/mmzone.h - low three bits) | |
16 | * | |
e53ef38d CL |
17 | * Do not put any conditional on these. If necessary modify the definitions |
18 | * without the underscores and use the consistently. The definitions here may | |
19 | * be used in bit comparisons. | |
1da177e4 | 20 | */ |
af4ca457 AV |
21 | #define __GFP_DMA ((__force gfp_t)0x01u) |
22 | #define __GFP_HIGHMEM ((__force gfp_t)0x02u) | |
e53ef38d | 23 | #define __GFP_DMA32 ((__force gfp_t)0x04u) |
b70d94ee CL |
24 | #define __GFP_MOVABLE ((__force gfp_t)0x08u) /* Page is movable */ |
25 | #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) | |
1da177e4 LT |
26 | /* |
27 | * Action modifiers - doesn't change the zoning | |
28 | * | |
29 | * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt | |
30 | * _might_ fail. This depends upon the particular VM implementation. | |
31 | * | |
32 | * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller | |
33 | * cannot handle allocation failures. | |
34 | * | |
35 | * __GFP_NORETRY: The VM implementation must not retry indefinitely. | |
769848c0 MG |
36 | * |
37 | * __GFP_MOVABLE: Flag that this page will be movable by the page migration | |
38 | * mechanism or reclaimed | |
1da177e4 | 39 | */ |
af4ca457 AV |
40 | #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ |
41 | #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ | |
42 | #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ | |
43 | #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ | |
44 | #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ | |
45 | #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ | |
ab857d09 NA |
46 | #define __GFP_REPEAT ((__force gfp_t)0x400u) /* See above */ |
47 | #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */ | |
48 | #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */ | |
af4ca457 AV |
49 | #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */ |
50 | #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */ | |
51 | #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */ | |
2d6c666e | 52 | #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ |
9b819d20 | 53 | #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */ |
e12ba74d | 54 | #define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */ |
b1eeab67 VN |
55 | |
56 | #ifdef CONFIG_KMEMCHECK | |
2dff4405 | 57 | #define __GFP_NOTRACK ((__force gfp_t)0x200000u) /* Don't track with kmemcheck */ |
b1eeab67 VN |
58 | #else |
59 | #define __GFP_NOTRACK ((__force gfp_t)0) | |
60 | #endif | |
1da177e4 | 61 | |
2dff4405 VN |
62 | /* |
63 | * This may seem redundant, but it's a way of annotating false positives vs. | |
64 | * allocations that simply cannot be supported (e.g. page tables). | |
65 | */ | |
66 | #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK) | |
67 | ||
68 | #define __GFP_BITS_SHIFT 22 /* Room for 22 __GFP_FOO bits */ | |
af4ca457 | 69 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
1da177e4 | 70 | |
7b04d717 JD |
71 | /* This equals 0, but use constants in case they ever change */ |
72 | #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) | |
4eac915d | 73 | /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
1da177e4 LT |
74 | #define GFP_ATOMIC (__GFP_HIGH) |
75 | #define GFP_NOIO (__GFP_WAIT) | |
76 | #define GFP_NOFS (__GFP_WAIT | __GFP_IO) | |
77 | #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) | |
e12ba74d MG |
78 | #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
79 | __GFP_RECLAIMABLE) | |
f90b1d2f PJ |
80 | #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
81 | #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ | |
82 | __GFP_HIGHMEM) | |
769848c0 MG |
83 | #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
84 | __GFP_HARDWALL | __GFP_HIGHMEM | \ | |
85 | __GFP_MOVABLE) | |
1da177e4 | 86 | |
77f700da | 87 | #ifdef CONFIG_NUMA |
980128f2 | 88 | #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) |
77f700da | 89 | #else |
f2e97df6 | 90 | #define GFP_THISNODE ((__force gfp_t)0) |
77f700da CL |
91 | #endif |
92 | ||
6cb06229 | 93 | /* This mask makes up all the page movable related flags */ |
e12ba74d | 94 | #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) |
6cb06229 CL |
95 | |
96 | /* Control page allocator reclaim behavior */ | |
97 | #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ | |
98 | __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ | |
99 | __GFP_NORETRY|__GFP_NOMEMALLOC) | |
100 | ||
7e85ee0c | 101 | /* Control slab gfp mask during early boot */ |
dcce284a | 102 | #define GFP_BOOT_MASK __GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS) |
7e85ee0c | 103 | |
6cb06229 CL |
104 | /* Control allocation constraints */ |
105 | #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) | |
106 | ||
107 | /* Do not use these with a slab allocator */ | |
108 | #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) | |
980128f2 | 109 | |
1da177e4 LT |
110 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
111 | platforms, used as appropriate on others */ | |
112 | ||
113 | #define GFP_DMA __GFP_DMA | |
114 | ||
a2f1b424 AK |
115 | /* 4GB DMA on some platforms */ |
116 | #define GFP_DMA32 __GFP_DMA32 | |
117 | ||
467c996c MG |
118 | /* Convert GFP flags to their corresponding migrate type */ |
119 | static inline int allocflags_to_migratetype(gfp_t gfp_flags) | |
120 | { | |
121 | WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); | |
122 | ||
123 | if (unlikely(page_group_by_mobility_disabled)) | |
124 | return MIGRATE_UNMOVABLE; | |
125 | ||
126 | /* Group based on mobility */ | |
127 | return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | | |
128 | ((gfp_flags & __GFP_RECLAIMABLE) != 0); | |
129 | } | |
a2f1b424 | 130 | |
b70d94ee CL |
131 | #ifdef CONFIG_HIGHMEM |
132 | #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM | |
133 | #else | |
134 | #define OPT_ZONE_HIGHMEM ZONE_NORMAL | |
135 | #endif | |
136 | ||
4b51d669 | 137 | #ifdef CONFIG_ZONE_DMA |
b70d94ee CL |
138 | #define OPT_ZONE_DMA ZONE_DMA |
139 | #else | |
140 | #define OPT_ZONE_DMA ZONE_NORMAL | |
4b51d669 | 141 | #endif |
b70d94ee | 142 | |
4e4785bc | 143 | #ifdef CONFIG_ZONE_DMA32 |
b70d94ee CL |
144 | #define OPT_ZONE_DMA32 ZONE_DMA32 |
145 | #else | |
146 | #define OPT_ZONE_DMA32 ZONE_NORMAL | |
4e4785bc | 147 | #endif |
b70d94ee CL |
148 | |
149 | /* | |
150 | * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the | |
151 | * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long | |
152 | * and there are 16 of them to cover all possible combinations of | |
153 | * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM | |
154 | * | |
155 | * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. | |
156 | * But GFP_MOVABLE is not only a zone specifier but also an allocation | |
157 | * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. | |
158 | * Only 1bit of the lowest 3 bit (DMA,DMA32,HIGHMEM) can be set to "1". | |
159 | * | |
160 | * bit result | |
161 | * ================= | |
162 | * 0x0 => NORMAL | |
163 | * 0x1 => DMA or NORMAL | |
164 | * 0x2 => HIGHMEM or NORMAL | |
165 | * 0x3 => BAD (DMA+HIGHMEM) | |
166 | * 0x4 => DMA32 or DMA or NORMAL | |
167 | * 0x5 => BAD (DMA+DMA32) | |
168 | * 0x6 => BAD (HIGHMEM+DMA32) | |
169 | * 0x7 => BAD (HIGHMEM+DMA32+DMA) | |
170 | * 0x8 => NORMAL (MOVABLE+0) | |
171 | * 0x9 => DMA or NORMAL (MOVABLE+DMA) | |
172 | * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) | |
173 | * 0xb => BAD (MOVABLE+HIGHMEM+DMA) | |
174 | * 0xc => DMA32 (MOVABLE+HIGHMEM+DMA32) | |
175 | * 0xd => BAD (MOVABLE+DMA32+DMA) | |
176 | * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) | |
177 | * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) | |
178 | * | |
179 | * ZONES_SHIFT must be <= 2 on 32 bit platforms. | |
180 | */ | |
181 | ||
182 | #if 16 * ZONES_SHIFT > BITS_PER_LONG | |
183 | #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer | |
184 | #endif | |
185 | ||
186 | #define GFP_ZONE_TABLE ( \ | |
187 | (ZONE_NORMAL << 0 * ZONES_SHIFT) \ | |
188 | | (OPT_ZONE_DMA << __GFP_DMA * ZONES_SHIFT) \ | |
189 | | (OPT_ZONE_HIGHMEM << __GFP_HIGHMEM * ZONES_SHIFT) \ | |
190 | | (OPT_ZONE_DMA32 << __GFP_DMA32 * ZONES_SHIFT) \ | |
191 | | (ZONE_NORMAL << __GFP_MOVABLE * ZONES_SHIFT) \ | |
192 | | (OPT_ZONE_DMA << (__GFP_MOVABLE | __GFP_DMA) * ZONES_SHIFT) \ | |
193 | | (ZONE_MOVABLE << (__GFP_MOVABLE | __GFP_HIGHMEM) * ZONES_SHIFT)\ | |
194 | | (OPT_ZONE_DMA32 << (__GFP_MOVABLE | __GFP_DMA32) * ZONES_SHIFT)\ | |
195 | ) | |
196 | ||
197 | /* | |
198 | * GFP_ZONE_BAD is a bitmap for all combination of __GFP_DMA, __GFP_DMA32 | |
199 | * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per | |
200 | * entry starting with bit 0. Bit is set if the combination is not | |
201 | * allowed. | |
202 | */ | |
203 | #define GFP_ZONE_BAD ( \ | |
204 | 1 << (__GFP_DMA | __GFP_HIGHMEM) \ | |
205 | | 1 << (__GFP_DMA | __GFP_DMA32) \ | |
206 | | 1 << (__GFP_DMA32 | __GFP_HIGHMEM) \ | |
207 | | 1 << (__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM) \ | |
208 | | 1 << (__GFP_MOVABLE | __GFP_HIGHMEM | __GFP_DMA) \ | |
209 | | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_DMA) \ | |
210 | | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_HIGHMEM) \ | |
211 | | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_DMA | __GFP_HIGHMEM)\ | |
212 | ) | |
213 | ||
214 | static inline enum zone_type gfp_zone(gfp_t flags) | |
215 | { | |
216 | enum zone_type z; | |
217 | int bit = flags & GFP_ZONEMASK; | |
218 | ||
219 | z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & | |
220 | ((1 << ZONES_SHIFT) - 1); | |
221 | ||
222 | if (__builtin_constant_p(bit)) | |
223 | BUILD_BUG_ON((GFP_ZONE_BAD >> bit) & 1); | |
224 | else { | |
225 | #ifdef CONFIG_DEBUG_VM | |
226 | BUG_ON((GFP_ZONE_BAD >> bit) & 1); | |
4e4785bc | 227 | #endif |
b70d94ee CL |
228 | } |
229 | return z; | |
4e4785bc CL |
230 | } |
231 | ||
1da177e4 LT |
232 | /* |
233 | * There is only one page-allocator function, and two main namespaces to | |
234 | * it. The alloc_page*() variants return 'struct page *' and as such | |
235 | * can allocate highmem pages, the *get*page*() variants return | |
236 | * virtual kernel addresses to the allocated page(s). | |
237 | */ | |
238 | ||
54a6eb5c MG |
239 | static inline int gfp_zonelist(gfp_t flags) |
240 | { | |
241 | if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE)) | |
242 | return 1; | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
1da177e4 LT |
247 | /* |
248 | * We get the zone list from the current node and the gfp_mask. | |
249 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. | |
54a6eb5c MG |
250 | * There are two zonelists per node, one for all zones with memory and |
251 | * one containing just zones from the node the zonelist belongs to. | |
1da177e4 LT |
252 | * |
253 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets | |
254 | * optimized to &contig_page_data at compile-time. | |
255 | */ | |
0e88460d MG |
256 | static inline struct zonelist *node_zonelist(int nid, gfp_t flags) |
257 | { | |
54a6eb5c | 258 | return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); |
0e88460d | 259 | } |
1da177e4 LT |
260 | |
261 | #ifndef HAVE_ARCH_FREE_PAGE | |
262 | static inline void arch_free_page(struct page *page, int order) { } | |
263 | #endif | |
cc102509 NP |
264 | #ifndef HAVE_ARCH_ALLOC_PAGE |
265 | static inline void arch_alloc_page(struct page *page, int order) { } | |
266 | #endif | |
1da177e4 | 267 | |
e4048e5d | 268 | struct page * |
d239171e | 269 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, |
e4048e5d KM |
270 | struct zonelist *zonelist, nodemask_t *nodemask); |
271 | ||
272 | static inline struct page * | |
273 | __alloc_pages(gfp_t gfp_mask, unsigned int order, | |
274 | struct zonelist *zonelist) | |
275 | { | |
d239171e | 276 | return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); |
e4048e5d KM |
277 | } |
278 | ||
dd0fc66f | 279 | static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
1da177e4 LT |
280 | unsigned int order) |
281 | { | |
819a6928 AK |
282 | /* Unknown node is current node */ |
283 | if (nid < 0) | |
284 | nid = numa_node_id(); | |
285 | ||
0e88460d | 286 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); |
1da177e4 LT |
287 | } |
288 | ||
6484eb3e MG |
289 | static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, |
290 | unsigned int order) | |
291 | { | |
292 | VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); | |
293 | ||
294 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); | |
295 | } | |
296 | ||
1da177e4 | 297 | #ifdef CONFIG_NUMA |
dd0fc66f | 298 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
1da177e4 LT |
299 | |
300 | static inline struct page * | |
dd0fc66f | 301 | alloc_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 | 302 | { |
1da177e4 LT |
303 | return alloc_pages_current(gfp_mask, order); |
304 | } | |
dd0fc66f | 305 | extern struct page *alloc_page_vma(gfp_t gfp_mask, |
1da177e4 LT |
306 | struct vm_area_struct *vma, unsigned long addr); |
307 | #else | |
308 | #define alloc_pages(gfp_mask, order) \ | |
309 | alloc_pages_node(numa_node_id(), gfp_mask, order) | |
310 | #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) | |
311 | #endif | |
312 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) | |
313 | ||
b3c97528 HH |
314 | extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); |
315 | extern unsigned long get_zeroed_page(gfp_t gfp_mask); | |
1da177e4 | 316 | |
2be0ffe2 TT |
317 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask); |
318 | void free_pages_exact(void *virt, size_t size); | |
319 | ||
1da177e4 LT |
320 | #define __get_free_page(gfp_mask) \ |
321 | __get_free_pages((gfp_mask),0) | |
322 | ||
323 | #define __get_dma_pages(gfp_mask, order) \ | |
324 | __get_free_pages((gfp_mask) | GFP_DMA,(order)) | |
325 | ||
b3c97528 HH |
326 | extern void __free_pages(struct page *page, unsigned int order); |
327 | extern void free_pages(unsigned long addr, unsigned int order); | |
328 | extern void free_hot_page(struct page *page); | |
329 | extern void free_cold_page(struct page *page); | |
1da177e4 LT |
330 | |
331 | #define __free_page(page) __free_pages((page), 0) | |
332 | #define free_page(addr) free_pages((addr),0) | |
333 | ||
334 | void page_alloc_init(void); | |
4037d452 | 335 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); |
9f8f2172 CL |
336 | void drain_all_pages(void); |
337 | void drain_local_pages(void *dummy); | |
1da177e4 | 338 | |
7f33d49a RW |
339 | extern bool oom_killer_disabled; |
340 | ||
341 | static inline void oom_killer_disable(void) | |
342 | { | |
343 | oom_killer_disabled = true; | |
344 | } | |
345 | ||
346 | static inline void oom_killer_enable(void) | |
347 | { | |
348 | oom_killer_disabled = false; | |
349 | } | |
350 | ||
dcce284a BH |
351 | extern gfp_t gfp_allowed_mask; |
352 | ||
353 | static inline void set_gfp_allowed_mask(gfp_t mask) | |
354 | { | |
355 | gfp_allowed_mask = mask; | |
356 | } | |
357 | ||
1da177e4 | 358 | #endif /* __LINUX_GFP_H */ |