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 | ||
16b56cf4 NK |
12 | /* Plain integer GFP bitmasks. Do not use this directly. */ |
13 | #define ___GFP_DMA 0x01u | |
14 | #define ___GFP_HIGHMEM 0x02u | |
15 | #define ___GFP_DMA32 0x04u | |
16 | #define ___GFP_MOVABLE 0x08u | |
17 | #define ___GFP_WAIT 0x10u | |
18 | #define ___GFP_HIGH 0x20u | |
19 | #define ___GFP_IO 0x40u | |
20 | #define ___GFP_FS 0x80u | |
21 | #define ___GFP_COLD 0x100u | |
22 | #define ___GFP_NOWARN 0x200u | |
23 | #define ___GFP_REPEAT 0x400u | |
24 | #define ___GFP_NOFAIL 0x800u | |
25 | #define ___GFP_NORETRY 0x1000u | |
26 | #define ___GFP_COMP 0x4000u | |
27 | #define ___GFP_ZERO 0x8000u | |
28 | #define ___GFP_NOMEMALLOC 0x10000u | |
29 | #define ___GFP_HARDWALL 0x20000u | |
30 | #define ___GFP_THISNODE 0x40000u | |
31 | #define ___GFP_RECLAIMABLE 0x80000u | |
32 | #ifdef CONFIG_KMEMCHECK | |
33 | #define ___GFP_NOTRACK 0x200000u | |
34 | #else | |
35 | #define ___GFP_NOTRACK 0 | |
36 | #endif | |
37 | ||
1da177e4 LT |
38 | /* |
39 | * GFP bitmasks.. | |
e53ef38d CL |
40 | * |
41 | * Zone modifiers (see linux/mmzone.h - low three bits) | |
42 | * | |
e53ef38d | 43 | * Do not put any conditional on these. If necessary modify the definitions |
263ff5d8 | 44 | * without the underscores and use them consistently. The definitions here may |
e53ef38d | 45 | * be used in bit comparisons. |
1da177e4 | 46 | */ |
16b56cf4 NK |
47 | #define __GFP_DMA ((__force gfp_t)___GFP_DMA) |
48 | #define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM) | |
49 | #define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32) | |
50 | #define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* Page is movable */ | |
b70d94ee | 51 | #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) |
1da177e4 LT |
52 | /* |
53 | * Action modifiers - doesn't change the zoning | |
54 | * | |
55 | * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt | |
56 | * _might_ fail. This depends upon the particular VM implementation. | |
57 | * | |
58 | * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller | |
478352e7 DR |
59 | * cannot handle allocation failures. This modifier is deprecated and no new |
60 | * users should be added. | |
1da177e4 LT |
61 | * |
62 | * __GFP_NORETRY: The VM implementation must not retry indefinitely. | |
769848c0 MG |
63 | * |
64 | * __GFP_MOVABLE: Flag that this page will be movable by the page migration | |
65 | * mechanism or reclaimed | |
1da177e4 | 66 | */ |
16b56cf4 NK |
67 | #define __GFP_WAIT ((__force gfp_t)___GFP_WAIT) /* Can wait and reschedule? */ |
68 | #define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) /* Should access emergency pools? */ | |
69 | #define __GFP_IO ((__force gfp_t)___GFP_IO) /* Can start physical IO? */ | |
70 | #define __GFP_FS ((__force gfp_t)___GFP_FS) /* Can call down to low-level FS? */ | |
71 | #define __GFP_COLD ((__force gfp_t)___GFP_COLD) /* Cache-cold page required */ | |
72 | #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) /* Suppress page allocation failure warning */ | |
73 | #define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */ | |
74 | #define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */ | |
75 | #define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */ | |
76 | #define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */ | |
77 | #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */ | |
78 | #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves */ | |
79 | #define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */ | |
80 | #define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */ | |
81 | #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */ | |
82 | #define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */ | |
1da177e4 | 83 | |
2dff4405 VN |
84 | /* |
85 | * This may seem redundant, but it's a way of annotating false positives vs. | |
86 | * allocations that simply cannot be supported (e.g. page tables). | |
87 | */ | |
88 | #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK) | |
89 | ||
90 | #define __GFP_BITS_SHIFT 22 /* Room for 22 __GFP_FOO bits */ | |
af4ca457 | 91 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
1da177e4 | 92 | |
7b04d717 JD |
93 | /* This equals 0, but use constants in case they ever change */ |
94 | #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) | |
4eac915d | 95 | /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
1da177e4 LT |
96 | #define GFP_ATOMIC (__GFP_HIGH) |
97 | #define GFP_NOIO (__GFP_WAIT) | |
98 | #define GFP_NOFS (__GFP_WAIT | __GFP_IO) | |
99 | #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) | |
e12ba74d MG |
100 | #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
101 | __GFP_RECLAIMABLE) | |
f90b1d2f PJ |
102 | #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
103 | #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ | |
104 | __GFP_HIGHMEM) | |
769848c0 MG |
105 | #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
106 | __GFP_HARDWALL | __GFP_HIGHMEM | \ | |
107 | __GFP_MOVABLE) | |
452aa699 | 108 | #define GFP_IOFS (__GFP_IO | __GFP_FS) |
1da177e4 | 109 | |
77f700da | 110 | #ifdef CONFIG_NUMA |
980128f2 | 111 | #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) |
77f700da | 112 | #else |
f2e97df6 | 113 | #define GFP_THISNODE ((__force gfp_t)0) |
77f700da CL |
114 | #endif |
115 | ||
6cb06229 | 116 | /* This mask makes up all the page movable related flags */ |
e12ba74d | 117 | #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) |
6cb06229 CL |
118 | |
119 | /* Control page allocator reclaim behavior */ | |
120 | #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ | |
121 | __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ | |
122 | __GFP_NORETRY|__GFP_NOMEMALLOC) | |
123 | ||
7e85ee0c | 124 | /* Control slab gfp mask during early boot */ |
fd23855e | 125 | #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)) |
7e85ee0c | 126 | |
6cb06229 CL |
127 | /* Control allocation constraints */ |
128 | #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) | |
129 | ||
130 | /* Do not use these with a slab allocator */ | |
131 | #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) | |
980128f2 | 132 | |
1da177e4 LT |
133 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
134 | platforms, used as appropriate on others */ | |
135 | ||
136 | #define GFP_DMA __GFP_DMA | |
137 | ||
a2f1b424 AK |
138 | /* 4GB DMA on some platforms */ |
139 | #define GFP_DMA32 __GFP_DMA32 | |
140 | ||
467c996c MG |
141 | /* Convert GFP flags to their corresponding migrate type */ |
142 | static inline int allocflags_to_migratetype(gfp_t gfp_flags) | |
143 | { | |
144 | WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); | |
145 | ||
146 | if (unlikely(page_group_by_mobility_disabled)) | |
147 | return MIGRATE_UNMOVABLE; | |
148 | ||
149 | /* Group based on mobility */ | |
150 | return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | | |
151 | ((gfp_flags & __GFP_RECLAIMABLE) != 0); | |
152 | } | |
a2f1b424 | 153 | |
b70d94ee CL |
154 | #ifdef CONFIG_HIGHMEM |
155 | #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM | |
156 | #else | |
157 | #define OPT_ZONE_HIGHMEM ZONE_NORMAL | |
158 | #endif | |
159 | ||
4b51d669 | 160 | #ifdef CONFIG_ZONE_DMA |
b70d94ee CL |
161 | #define OPT_ZONE_DMA ZONE_DMA |
162 | #else | |
163 | #define OPT_ZONE_DMA ZONE_NORMAL | |
4b51d669 | 164 | #endif |
b70d94ee | 165 | |
4e4785bc | 166 | #ifdef CONFIG_ZONE_DMA32 |
b70d94ee CL |
167 | #define OPT_ZONE_DMA32 ZONE_DMA32 |
168 | #else | |
169 | #define OPT_ZONE_DMA32 ZONE_NORMAL | |
4e4785bc | 170 | #endif |
b70d94ee CL |
171 | |
172 | /* | |
173 | * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the | |
174 | * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long | |
175 | * and there are 16 of them to cover all possible combinations of | |
263ff5d8 | 176 | * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM. |
b70d94ee CL |
177 | * |
178 | * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. | |
179 | * But GFP_MOVABLE is not only a zone specifier but also an allocation | |
180 | * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. | |
263ff5d8 | 181 | * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1". |
b70d94ee CL |
182 | * |
183 | * bit result | |
184 | * ================= | |
185 | * 0x0 => NORMAL | |
186 | * 0x1 => DMA or NORMAL | |
187 | * 0x2 => HIGHMEM or NORMAL | |
188 | * 0x3 => BAD (DMA+HIGHMEM) | |
189 | * 0x4 => DMA32 or DMA or NORMAL | |
190 | * 0x5 => BAD (DMA+DMA32) | |
191 | * 0x6 => BAD (HIGHMEM+DMA32) | |
192 | * 0x7 => BAD (HIGHMEM+DMA32+DMA) | |
193 | * 0x8 => NORMAL (MOVABLE+0) | |
194 | * 0x9 => DMA or NORMAL (MOVABLE+DMA) | |
195 | * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) | |
196 | * 0xb => BAD (MOVABLE+HIGHMEM+DMA) | |
197 | * 0xc => DMA32 (MOVABLE+HIGHMEM+DMA32) | |
198 | * 0xd => BAD (MOVABLE+DMA32+DMA) | |
199 | * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) | |
200 | * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) | |
201 | * | |
202 | * ZONES_SHIFT must be <= 2 on 32 bit platforms. | |
203 | */ | |
204 | ||
205 | #if 16 * ZONES_SHIFT > BITS_PER_LONG | |
206 | #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer | |
207 | #endif | |
208 | ||
209 | #define GFP_ZONE_TABLE ( \ | |
16b56cf4 NK |
210 | (ZONE_NORMAL << 0 * ZONES_SHIFT) \ |
211 | | (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT) \ | |
212 | | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT) \ | |
213 | | (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT) \ | |
214 | | (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT) \ | |
215 | | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * ZONES_SHIFT) \ | |
216 | | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * ZONES_SHIFT) \ | |
217 | | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * ZONES_SHIFT) \ | |
b70d94ee CL |
218 | ) |
219 | ||
220 | /* | |
263ff5d8 | 221 | * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32 |
b70d94ee CL |
222 | * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per |
223 | * entry starting with bit 0. Bit is set if the combination is not | |
224 | * allowed. | |
225 | */ | |
226 | #define GFP_ZONE_BAD ( \ | |
16b56cf4 NK |
227 | 1 << (___GFP_DMA | ___GFP_HIGHMEM) \ |
228 | | 1 << (___GFP_DMA | ___GFP_DMA32) \ | |
229 | | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
230 | | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
231 | | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \ | |
232 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \ | |
233 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
234 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \ | |
b70d94ee CL |
235 | ) |
236 | ||
237 | static inline enum zone_type gfp_zone(gfp_t flags) | |
238 | { | |
239 | enum zone_type z; | |
16b56cf4 | 240 | int bit = (__force int) (flags & GFP_ZONEMASK); |
b70d94ee CL |
241 | |
242 | z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & | |
243 | ((1 << ZONES_SHIFT) - 1); | |
244 | ||
245 | if (__builtin_constant_p(bit)) | |
8c87df45 | 246 | MAYBE_BUILD_BUG_ON((GFP_ZONE_BAD >> bit) & 1); |
b70d94ee CL |
247 | else { |
248 | #ifdef CONFIG_DEBUG_VM | |
249 | BUG_ON((GFP_ZONE_BAD >> bit) & 1); | |
4e4785bc | 250 | #endif |
b70d94ee CL |
251 | } |
252 | return z; | |
4e4785bc CL |
253 | } |
254 | ||
1da177e4 LT |
255 | /* |
256 | * There is only one page-allocator function, and two main namespaces to | |
257 | * it. The alloc_page*() variants return 'struct page *' and as such | |
258 | * can allocate highmem pages, the *get*page*() variants return | |
259 | * virtual kernel addresses to the allocated page(s). | |
260 | */ | |
261 | ||
54a6eb5c MG |
262 | static inline int gfp_zonelist(gfp_t flags) |
263 | { | |
264 | if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE)) | |
265 | return 1; | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
1da177e4 LT |
270 | /* |
271 | * We get the zone list from the current node and the gfp_mask. | |
272 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. | |
54a6eb5c MG |
273 | * There are two zonelists per node, one for all zones with memory and |
274 | * one containing just zones from the node the zonelist belongs to. | |
1da177e4 LT |
275 | * |
276 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets | |
277 | * optimized to &contig_page_data at compile-time. | |
278 | */ | |
0e88460d MG |
279 | static inline struct zonelist *node_zonelist(int nid, gfp_t flags) |
280 | { | |
54a6eb5c | 281 | return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); |
0e88460d | 282 | } |
1da177e4 LT |
283 | |
284 | #ifndef HAVE_ARCH_FREE_PAGE | |
285 | static inline void arch_free_page(struct page *page, int order) { } | |
286 | #endif | |
cc102509 NP |
287 | #ifndef HAVE_ARCH_ALLOC_PAGE |
288 | static inline void arch_alloc_page(struct page *page, int order) { } | |
289 | #endif | |
1da177e4 | 290 | |
e4048e5d | 291 | struct page * |
d239171e | 292 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, |
e4048e5d KM |
293 | struct zonelist *zonelist, nodemask_t *nodemask); |
294 | ||
295 | static inline struct page * | |
296 | __alloc_pages(gfp_t gfp_mask, unsigned int order, | |
297 | struct zonelist *zonelist) | |
298 | { | |
d239171e | 299 | return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); |
e4048e5d KM |
300 | } |
301 | ||
dd0fc66f | 302 | static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
1da177e4 LT |
303 | unsigned int order) |
304 | { | |
819a6928 AK |
305 | /* Unknown node is current node */ |
306 | if (nid < 0) | |
307 | nid = numa_node_id(); | |
308 | ||
0e88460d | 309 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); |
1da177e4 LT |
310 | } |
311 | ||
6484eb3e MG |
312 | static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, |
313 | unsigned int order) | |
314 | { | |
315 | VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); | |
316 | ||
317 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); | |
318 | } | |
319 | ||
1da177e4 | 320 | #ifdef CONFIG_NUMA |
dd0fc66f | 321 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
1da177e4 LT |
322 | |
323 | static inline struct page * | |
dd0fc66f | 324 | alloc_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 | 325 | { |
1da177e4 LT |
326 | return alloc_pages_current(gfp_mask, order); |
327 | } | |
dd0fc66f | 328 | extern struct page *alloc_page_vma(gfp_t gfp_mask, |
1da177e4 LT |
329 | struct vm_area_struct *vma, unsigned long addr); |
330 | #else | |
331 | #define alloc_pages(gfp_mask, order) \ | |
332 | alloc_pages_node(numa_node_id(), gfp_mask, order) | |
333 | #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) | |
334 | #endif | |
335 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) | |
336 | ||
b3c97528 HH |
337 | extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); |
338 | extern unsigned long get_zeroed_page(gfp_t gfp_mask); | |
1da177e4 | 339 | |
2be0ffe2 TT |
340 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask); |
341 | void free_pages_exact(void *virt, size_t size); | |
342 | ||
1da177e4 | 343 | #define __get_free_page(gfp_mask) \ |
fd23855e | 344 | __get_free_pages((gfp_mask), 0) |
1da177e4 LT |
345 | |
346 | #define __get_dma_pages(gfp_mask, order) \ | |
fd23855e | 347 | __get_free_pages((gfp_mask) | GFP_DMA, (order)) |
1da177e4 | 348 | |
b3c97528 HH |
349 | extern void __free_pages(struct page *page, unsigned int order); |
350 | extern void free_pages(unsigned long addr, unsigned int order); | |
fc91668e | 351 | extern void free_hot_cold_page(struct page *page, int cold); |
1da177e4 LT |
352 | |
353 | #define __free_page(page) __free_pages((page), 0) | |
fd23855e | 354 | #define free_page(addr) free_pages((addr), 0) |
1da177e4 LT |
355 | |
356 | void page_alloc_init(void); | |
4037d452 | 357 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); |
9f8f2172 CL |
358 | void drain_all_pages(void); |
359 | void drain_local_pages(void *dummy); | |
1da177e4 | 360 | |
dcce284a BH |
361 | extern gfp_t gfp_allowed_mask; |
362 | ||
452aa699 RW |
363 | extern void set_gfp_allowed_mask(gfp_t mask); |
364 | extern gfp_t clear_gfp_allowed_mask(gfp_t mask); | |
dcce284a | 365 | |
1da177e4 | 366 | #endif /* __LINUX_GFP_H */ |