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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> | |
1da177e4 LT |
7 | |
8 | struct vm_area_struct; | |
9 | ||
10 | /* | |
11 | * GFP bitmasks.. | |
e53ef38d CL |
12 | * |
13 | * Zone modifiers (see linux/mmzone.h - low three bits) | |
14 | * | |
e53ef38d CL |
15 | * Do not put any conditional on these. If necessary modify the definitions |
16 | * without the underscores and use the consistently. The definitions here may | |
17 | * be used in bit comparisons. | |
1da177e4 | 18 | */ |
af4ca457 AV |
19 | #define __GFP_DMA ((__force gfp_t)0x01u) |
20 | #define __GFP_HIGHMEM ((__force gfp_t)0x02u) | |
e53ef38d | 21 | #define __GFP_DMA32 ((__force gfp_t)0x04u) |
1da177e4 LT |
22 | |
23 | /* | |
24 | * Action modifiers - doesn't change the zoning | |
25 | * | |
26 | * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt | |
27 | * _might_ fail. This depends upon the particular VM implementation. | |
28 | * | |
29 | * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller | |
30 | * cannot handle allocation failures. | |
31 | * | |
32 | * __GFP_NORETRY: The VM implementation must not retry indefinitely. | |
769848c0 MG |
33 | * |
34 | * __GFP_MOVABLE: Flag that this page will be movable by the page migration | |
35 | * mechanism or reclaimed | |
1da177e4 | 36 | */ |
af4ca457 AV |
37 | #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ |
38 | #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ | |
39 | #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ | |
40 | #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ | |
41 | #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ | |
42 | #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ | |
ab857d09 NA |
43 | #define __GFP_REPEAT ((__force gfp_t)0x400u) /* See above */ |
44 | #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */ | |
45 | #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */ | |
af4ca457 AV |
46 | #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */ |
47 | #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */ | |
48 | #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */ | |
2d6c666e | 49 | #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ |
9b819d20 | 50 | #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */ |
e12ba74d MG |
51 | #define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */ |
52 | #define __GFP_MOVABLE ((__force gfp_t)0x100000u) /* Page is movable */ | |
1da177e4 | 53 | |
e12ba74d | 54 | #define __GFP_BITS_SHIFT 21 /* Room for 21 __GFP_FOO bits */ |
af4ca457 | 55 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
1da177e4 | 56 | |
7b04d717 JD |
57 | /* This equals 0, but use constants in case they ever change */ |
58 | #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) | |
4eac915d | 59 | /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
1da177e4 LT |
60 | #define GFP_ATOMIC (__GFP_HIGH) |
61 | #define GFP_NOIO (__GFP_WAIT) | |
62 | #define GFP_NOFS (__GFP_WAIT | __GFP_IO) | |
63 | #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) | |
e12ba74d MG |
64 | #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
65 | __GFP_RECLAIMABLE) | |
f90b1d2f PJ |
66 | #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
67 | #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ | |
68 | __GFP_HIGHMEM) | |
769848c0 MG |
69 | #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
70 | __GFP_HARDWALL | __GFP_HIGHMEM | \ | |
71 | __GFP_MOVABLE) | |
1da177e4 | 72 | |
77f700da | 73 | #ifdef CONFIG_NUMA |
980128f2 | 74 | #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) |
77f700da | 75 | #else |
f2e97df6 | 76 | #define GFP_THISNODE ((__force gfp_t)0) |
77f700da CL |
77 | #endif |
78 | ||
6cb06229 | 79 | /* This mask makes up all the page movable related flags */ |
e12ba74d | 80 | #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) |
6cb06229 CL |
81 | |
82 | /* Control page allocator reclaim behavior */ | |
83 | #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ | |
84 | __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ | |
85 | __GFP_NORETRY|__GFP_NOMEMALLOC) | |
86 | ||
87 | /* Control allocation constraints */ | |
88 | #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) | |
89 | ||
90 | /* Do not use these with a slab allocator */ | |
91 | #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) | |
980128f2 | 92 | |
1da177e4 LT |
93 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
94 | platforms, used as appropriate on others */ | |
95 | ||
96 | #define GFP_DMA __GFP_DMA | |
97 | ||
a2f1b424 AK |
98 | /* 4GB DMA on some platforms */ |
99 | #define GFP_DMA32 __GFP_DMA32 | |
100 | ||
467c996c MG |
101 | /* Convert GFP flags to their corresponding migrate type */ |
102 | static inline int allocflags_to_migratetype(gfp_t gfp_flags) | |
103 | { | |
104 | WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); | |
105 | ||
106 | if (unlikely(page_group_by_mobility_disabled)) | |
107 | return MIGRATE_UNMOVABLE; | |
108 | ||
109 | /* Group based on mobility */ | |
110 | return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | | |
111 | ((gfp_flags & __GFP_RECLAIMABLE) != 0); | |
112 | } | |
a2f1b424 | 113 | |
19655d34 | 114 | static inline enum zone_type gfp_zone(gfp_t flags) |
4e4785bc | 115 | { |
4b51d669 | 116 | #ifdef CONFIG_ZONE_DMA |
4e4785bc | 117 | if (flags & __GFP_DMA) |
8cece85e | 118 | return ZONE_DMA; |
4b51d669 | 119 | #endif |
4e4785bc CL |
120 | #ifdef CONFIG_ZONE_DMA32 |
121 | if (flags & __GFP_DMA32) | |
8cece85e | 122 | return ZONE_DMA32; |
4e4785bc | 123 | #endif |
2a1e274a MG |
124 | if ((flags & (__GFP_HIGHMEM | __GFP_MOVABLE)) == |
125 | (__GFP_HIGHMEM | __GFP_MOVABLE)) | |
8cece85e | 126 | return ZONE_MOVABLE; |
4e4785bc CL |
127 | #ifdef CONFIG_HIGHMEM |
128 | if (flags & __GFP_HIGHMEM) | |
8cece85e | 129 | return ZONE_HIGHMEM; |
4e4785bc | 130 | #endif |
8cece85e | 131 | return ZONE_NORMAL; |
4e4785bc CL |
132 | } |
133 | ||
1da177e4 LT |
134 | /* |
135 | * There is only one page-allocator function, and two main namespaces to | |
136 | * it. The alloc_page*() variants return 'struct page *' and as such | |
137 | * can allocate highmem pages, the *get*page*() variants return | |
138 | * virtual kernel addresses to the allocated page(s). | |
139 | */ | |
140 | ||
54a6eb5c MG |
141 | static inline int gfp_zonelist(gfp_t flags) |
142 | { | |
143 | if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE)) | |
144 | return 1; | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
1da177e4 LT |
149 | /* |
150 | * We get the zone list from the current node and the gfp_mask. | |
151 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. | |
54a6eb5c MG |
152 | * There are two zonelists per node, one for all zones with memory and |
153 | * one containing just zones from the node the zonelist belongs to. | |
1da177e4 LT |
154 | * |
155 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets | |
156 | * optimized to &contig_page_data at compile-time. | |
157 | */ | |
0e88460d MG |
158 | static inline struct zonelist *node_zonelist(int nid, gfp_t flags) |
159 | { | |
54a6eb5c | 160 | return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); |
0e88460d | 161 | } |
1da177e4 LT |
162 | |
163 | #ifndef HAVE_ARCH_FREE_PAGE | |
164 | static inline void arch_free_page(struct page *page, int order) { } | |
165 | #endif | |
cc102509 NP |
166 | #ifndef HAVE_ARCH_ALLOC_PAGE |
167 | static inline void arch_alloc_page(struct page *page, int order) { } | |
168 | #endif | |
1da177e4 | 169 | |
e4048e5d KM |
170 | struct page * |
171 | __alloc_pages_internal(gfp_t gfp_mask, unsigned int order, | |
172 | struct zonelist *zonelist, nodemask_t *nodemask); | |
173 | ||
174 | static inline struct page * | |
175 | __alloc_pages(gfp_t gfp_mask, unsigned int order, | |
176 | struct zonelist *zonelist) | |
177 | { | |
178 | return __alloc_pages_internal(gfp_mask, order, zonelist, NULL); | |
179 | } | |
180 | ||
181 | static inline struct page * | |
182 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, | |
183 | struct zonelist *zonelist, nodemask_t *nodemask) | |
184 | { | |
185 | return __alloc_pages_internal(gfp_mask, order, zonelist, nodemask); | |
186 | } | |
1da177e4 | 187 | |
19770b32 | 188 | |
dd0fc66f | 189 | static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
1da177e4 LT |
190 | unsigned int order) |
191 | { | |
192 | if (unlikely(order >= MAX_ORDER)) | |
193 | return NULL; | |
194 | ||
819a6928 AK |
195 | /* Unknown node is current node */ |
196 | if (nid < 0) | |
197 | nid = numa_node_id(); | |
198 | ||
0e88460d | 199 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); |
1da177e4 LT |
200 | } |
201 | ||
202 | #ifdef CONFIG_NUMA | |
dd0fc66f | 203 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
1da177e4 LT |
204 | |
205 | static inline struct page * | |
dd0fc66f | 206 | alloc_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 LT |
207 | { |
208 | if (unlikely(order >= MAX_ORDER)) | |
209 | return NULL; | |
210 | ||
211 | return alloc_pages_current(gfp_mask, order); | |
212 | } | |
dd0fc66f | 213 | extern struct page *alloc_page_vma(gfp_t gfp_mask, |
1da177e4 LT |
214 | struct vm_area_struct *vma, unsigned long addr); |
215 | #else | |
216 | #define alloc_pages(gfp_mask, order) \ | |
217 | alloc_pages_node(numa_node_id(), gfp_mask, order) | |
218 | #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) | |
219 | #endif | |
220 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) | |
221 | ||
b3c97528 HH |
222 | extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); |
223 | extern unsigned long get_zeroed_page(gfp_t gfp_mask); | |
1da177e4 | 224 | |
2be0ffe2 TT |
225 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask); |
226 | void free_pages_exact(void *virt, size_t size); | |
227 | ||
1da177e4 LT |
228 | #define __get_free_page(gfp_mask) \ |
229 | __get_free_pages((gfp_mask),0) | |
230 | ||
231 | #define __get_dma_pages(gfp_mask, order) \ | |
232 | __get_free_pages((gfp_mask) | GFP_DMA,(order)) | |
233 | ||
b3c97528 HH |
234 | extern void __free_pages(struct page *page, unsigned int order); |
235 | extern void free_pages(unsigned long addr, unsigned int order); | |
236 | extern void free_hot_page(struct page *page); | |
237 | extern void free_cold_page(struct page *page); | |
1da177e4 LT |
238 | |
239 | #define __free_page(page) __free_pages((page), 0) | |
240 | #define free_page(addr) free_pages((addr),0) | |
241 | ||
242 | void page_alloc_init(void); | |
4037d452 | 243 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); |
9f8f2172 CL |
244 | void drain_all_pages(void); |
245 | void drain_local_pages(void *dummy); | |
1da177e4 LT |
246 | |
247 | #endif /* __LINUX_GFP_H */ |