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> 7 8 struct vm_area_struct; 9 10 /* 11 * GFP bitmasks.. 12 * 13 * Zone modifiers (see linux/mmzone.h - low three bits) 14 * 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. 18 */ 19 #define __GFP_DMA ((__force gfp_t)0x01u) 20 #define __GFP_HIGHMEM ((__force gfp_t)0x02u) 21 #define __GFP_DMA32 ((__force gfp_t)0x04u) 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 * 34 * __GFP_MOVABLE: Flag that this page will be movable by the page migration 35 * mechanism or reclaimed 36 */ 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 */ 43 #define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */ 44 #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */ 45 #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */ 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 */ 49 #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ 50 #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */ 51 #define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */ 52 #define __GFP_MOVABLE ((__force gfp_t)0x100000u) /* Page is movable */ 53 54 #define __GFP_BITS_SHIFT 21 /* Room for 21 __GFP_FOO bits */ 55 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) 56 57 /* This equals 0, but use constants in case they ever change */ 58 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) 59 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ 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) 64 #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 65 __GFP_RECLAIMABLE) 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) 69 #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 70 __GFP_HARDWALL | __GFP_HIGHMEM | \ 71 __GFP_MOVABLE) 72 #define GFP_NOFS_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_MOVABLE) 73 #define GFP_USER_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 74 __GFP_HARDWALL | __GFP_MOVABLE) 75 #define GFP_HIGHUSER_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 76 __GFP_HARDWALL | __GFP_HIGHMEM | \ 77 __GFP_MOVABLE) 78 79 #ifdef CONFIG_NUMA 80 #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) 81 #else 82 #define GFP_THISNODE ((__force gfp_t)0) 83 #endif 84 85 /* This mask makes up all the page movable related flags */ 86 #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) 87 88 /* Control page allocator reclaim behavior */ 89 #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ 90 __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ 91 __GFP_NORETRY|__GFP_NOMEMALLOC) 92 93 /* Control allocation constraints */ 94 #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) 95 96 /* Do not use these with a slab allocator */ 97 #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) 98 99 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some 100 platforms, used as appropriate on others */ 101 102 #define GFP_DMA __GFP_DMA 103 104 /* 4GB DMA on some platforms */ 105 #define GFP_DMA32 __GFP_DMA32 106 107 /* Convert GFP flags to their corresponding migrate type */ 108 static inline int allocflags_to_migratetype(gfp_t gfp_flags) 109 { 110 WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); 111 112 if (unlikely(page_group_by_mobility_disabled)) 113 return MIGRATE_UNMOVABLE; 114 115 /* Group based on mobility */ 116 return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | 117 ((gfp_flags & __GFP_RECLAIMABLE) != 0); 118 } 119 120 static inline enum zone_type gfp_zone(gfp_t flags) 121 { 122 int base = 0; 123 124 #ifdef CONFIG_NUMA 125 if (flags & __GFP_THISNODE) 126 base = MAX_NR_ZONES; 127 #endif 128 129 #ifdef CONFIG_ZONE_DMA 130 if (flags & __GFP_DMA) 131 return base + ZONE_DMA; 132 #endif 133 #ifdef CONFIG_ZONE_DMA32 134 if (flags & __GFP_DMA32) 135 return base + ZONE_DMA32; 136 #endif 137 if ((flags & (__GFP_HIGHMEM | __GFP_MOVABLE)) == 138 (__GFP_HIGHMEM | __GFP_MOVABLE)) 139 return base + ZONE_MOVABLE; 140 #ifdef CONFIG_HIGHMEM 141 if (flags & __GFP_HIGHMEM) 142 return base + ZONE_HIGHMEM; 143 #endif 144 return base + ZONE_NORMAL; 145 } 146 147 static inline gfp_t set_migrateflags(gfp_t gfp, gfp_t migrate_flags) 148 { 149 BUG_ON((gfp & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); 150 return (gfp & ~(GFP_MOVABLE_MASK)) | migrate_flags; 151 } 152 153 /* 154 * There is only one page-allocator function, and two main namespaces to 155 * it. The alloc_page*() variants return 'struct page *' and as such 156 * can allocate highmem pages, the *get*page*() variants return 157 * virtual kernel addresses to the allocated page(s). 158 */ 159 160 /* 161 * We get the zone list from the current node and the gfp_mask. 162 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. 163 * 164 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets 165 * optimized to &contig_page_data at compile-time. 166 */ 167 168 #ifndef HAVE_ARCH_FREE_PAGE 169 static inline void arch_free_page(struct page *page, int order) { } 170 #endif 171 #ifndef HAVE_ARCH_ALLOC_PAGE 172 static inline void arch_alloc_page(struct page *page, int order) { } 173 #endif 174 175 extern struct page *__alloc_pages(gfp_t, unsigned int, struct zonelist *); 176 177 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, 178 unsigned int order) 179 { 180 if (unlikely(order >= MAX_ORDER)) 181 return NULL; 182 183 /* Unknown node is current node */ 184 if (nid < 0) 185 nid = numa_node_id(); 186 187 return __alloc_pages(gfp_mask, order, 188 NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask)); 189 } 190 191 #ifdef CONFIG_NUMA 192 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); 193 194 static inline struct page * 195 alloc_pages(gfp_t gfp_mask, unsigned int order) 196 { 197 if (unlikely(order >= MAX_ORDER)) 198 return NULL; 199 200 return alloc_pages_current(gfp_mask, order); 201 } 202 extern struct page *alloc_page_vma(gfp_t gfp_mask, 203 struct vm_area_struct *vma, unsigned long addr); 204 #else 205 #define alloc_pages(gfp_mask, order) \ 206 alloc_pages_node(numa_node_id(), gfp_mask, order) 207 #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) 208 #endif 209 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) 210 211 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); 212 extern unsigned long get_zeroed_page(gfp_t gfp_mask); 213 214 #define __get_free_page(gfp_mask) \ 215 __get_free_pages((gfp_mask),0) 216 217 #define __get_dma_pages(gfp_mask, order) \ 218 __get_free_pages((gfp_mask) | GFP_DMA,(order)) 219 220 extern void __free_pages(struct page *page, unsigned int order); 221 extern void free_pages(unsigned long addr, unsigned int order); 222 extern void free_hot_page(struct page *page); 223 extern void free_cold_page(struct page *page); 224 225 #define __free_page(page) __free_pages((page), 0) 226 #define free_page(addr) free_pages((addr),0) 227 228 void page_alloc_init(void); 229 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); 230 void drain_all_pages(void); 231 void drain_local_pages(void *dummy); 232 233 #endif /* __LINUX_GFP_H */ 234