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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. | |
33 | */ | |
af4ca457 AV |
34 | #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ |
35 | #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ | |
36 | #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ | |
37 | #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ | |
38 | #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ | |
39 | #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ | |
40 | #define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */ | |
41 | #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */ | |
42 | #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */ | |
af4ca457 AV |
43 | #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */ |
44 | #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */ | |
45 | #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */ | |
2d6c666e | 46 | #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ |
9b819d20 | 47 | #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */ |
1da177e4 | 48 | |
b84a35be | 49 | #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */ |
af4ca457 | 50 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
1da177e4 LT |
51 | |
52 | /* if you forget to add the bitmask here kernel will crash, period */ | |
53 | #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \ | |
54 | __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \ | |
cfce6604 | 55 | __GFP_NOFAIL|__GFP_NORETRY|__GFP_COMP| \ |
9b819d20 | 56 | __GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_THISNODE) |
1da177e4 | 57 | |
7b04d717 JD |
58 | /* This equals 0, but use constants in case they ever change */ |
59 | #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) | |
4eac915d | 60 | /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
1da177e4 LT |
61 | #define GFP_ATOMIC (__GFP_HIGH) |
62 | #define GFP_NOIO (__GFP_WAIT) | |
63 | #define GFP_NOFS (__GFP_WAIT | __GFP_IO) | |
64 | #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) | |
f90b1d2f PJ |
65 | #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
66 | #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ | |
67 | __GFP_HIGHMEM) | |
1da177e4 | 68 | |
77f700da | 69 | #ifdef CONFIG_NUMA |
980128f2 | 70 | #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) |
77f700da | 71 | #else |
f2e97df6 | 72 | #define GFP_THISNODE ((__force gfp_t)0) |
77f700da CL |
73 | #endif |
74 | ||
980128f2 | 75 | |
1da177e4 LT |
76 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
77 | platforms, used as appropriate on others */ | |
78 | ||
79 | #define GFP_DMA __GFP_DMA | |
80 | ||
a2f1b424 AK |
81 | /* 4GB DMA on some platforms */ |
82 | #define GFP_DMA32 __GFP_DMA32 | |
83 | ||
84 | ||
19655d34 | 85 | static inline enum zone_type gfp_zone(gfp_t flags) |
4e4785bc | 86 | { |
4b51d669 | 87 | #ifdef CONFIG_ZONE_DMA |
4e4785bc CL |
88 | if (flags & __GFP_DMA) |
89 | return ZONE_DMA; | |
4b51d669 | 90 | #endif |
4e4785bc CL |
91 | #ifdef CONFIG_ZONE_DMA32 |
92 | if (flags & __GFP_DMA32) | |
93 | return ZONE_DMA32; | |
94 | #endif | |
95 | #ifdef CONFIG_HIGHMEM | |
96 | if (flags & __GFP_HIGHMEM) | |
97 | return ZONE_HIGHMEM; | |
98 | #endif | |
99 | return ZONE_NORMAL; | |
100 | } | |
101 | ||
1da177e4 LT |
102 | /* |
103 | * There is only one page-allocator function, and two main namespaces to | |
104 | * it. The alloc_page*() variants return 'struct page *' and as such | |
105 | * can allocate highmem pages, the *get*page*() variants return | |
106 | * virtual kernel addresses to the allocated page(s). | |
107 | */ | |
108 | ||
109 | /* | |
110 | * We get the zone list from the current node and the gfp_mask. | |
111 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. | |
112 | * | |
113 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets | |
114 | * optimized to &contig_page_data at compile-time. | |
115 | */ | |
116 | ||
117 | #ifndef HAVE_ARCH_FREE_PAGE | |
118 | static inline void arch_free_page(struct page *page, int order) { } | |
119 | #endif | |
cc102509 NP |
120 | #ifndef HAVE_ARCH_ALLOC_PAGE |
121 | static inline void arch_alloc_page(struct page *page, int order) { } | |
122 | #endif | |
1da177e4 LT |
123 | |
124 | extern struct page * | |
dd0fc66f | 125 | FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *)); |
1da177e4 | 126 | |
dd0fc66f | 127 | static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
1da177e4 LT |
128 | unsigned int order) |
129 | { | |
130 | if (unlikely(order >= MAX_ORDER)) | |
131 | return NULL; | |
132 | ||
819a6928 AK |
133 | /* Unknown node is current node */ |
134 | if (nid < 0) | |
135 | nid = numa_node_id(); | |
136 | ||
1da177e4 | 137 | return __alloc_pages(gfp_mask, order, |
af4ca457 | 138 | NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask)); |
1da177e4 LT |
139 | } |
140 | ||
141 | #ifdef CONFIG_NUMA | |
dd0fc66f | 142 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
1da177e4 LT |
143 | |
144 | static inline struct page * | |
dd0fc66f | 145 | alloc_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 LT |
146 | { |
147 | if (unlikely(order >= MAX_ORDER)) | |
148 | return NULL; | |
149 | ||
150 | return alloc_pages_current(gfp_mask, order); | |
151 | } | |
dd0fc66f | 152 | extern struct page *alloc_page_vma(gfp_t gfp_mask, |
1da177e4 LT |
153 | struct vm_area_struct *vma, unsigned long addr); |
154 | #else | |
155 | #define alloc_pages(gfp_mask, order) \ | |
156 | alloc_pages_node(numa_node_id(), gfp_mask, order) | |
157 | #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) | |
158 | #endif | |
159 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) | |
160 | ||
dd0fc66f AV |
161 | extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order)); |
162 | extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask)); | |
1da177e4 LT |
163 | |
164 | #define __get_free_page(gfp_mask) \ | |
165 | __get_free_pages((gfp_mask),0) | |
166 | ||
167 | #define __get_dma_pages(gfp_mask, order) \ | |
168 | __get_free_pages((gfp_mask) | GFP_DMA,(order)) | |
169 | ||
170 | extern void FASTCALL(__free_pages(struct page *page, unsigned int order)); | |
171 | extern void FASTCALL(free_pages(unsigned long addr, unsigned int order)); | |
172 | extern void FASTCALL(free_hot_page(struct page *page)); | |
173 | extern void FASTCALL(free_cold_page(struct page *page)); | |
174 | ||
175 | #define __free_page(page) __free_pages((page), 0) | |
176 | #define free_page(addr) free_pages((addr),0) | |
177 | ||
178 | void page_alloc_init(void); | |
4ae7c039 | 179 | #ifdef CONFIG_NUMA |
8fce4d8e | 180 | void drain_node_pages(int node); |
4ae7c039 | 181 | #else |
8fce4d8e | 182 | static inline void drain_node_pages(int node) { }; |
4ae7c039 | 183 | #endif |
1da177e4 LT |
184 | |
185 | #endif /* __LINUX_GFP_H */ |