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) /* See above */ 44 #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */ 45 #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */ 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 73 #ifdef CONFIG_NUMA 74 #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) 75 #else 76 #define GFP_THISNODE ((__force gfp_t)0) 77 #endif 78 79 /* This mask makes up all the page movable related flags */ 80 #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) 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) 92 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 98 /* 4GB DMA on some platforms */ 99 #define GFP_DMA32 __GFP_DMA32 100 101 /* 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 } 113 114 static inline enum zone_type gfp_zone(gfp_t flags) 115 { 116 #ifdef CONFIG_ZONE_DMA 117 if (flags & __GFP_DMA) 118 return ZONE_DMA; 119 #endif 120 #ifdef CONFIG_ZONE_DMA32 121 if (flags & __GFP_DMA32) 122 return ZONE_DMA32; 123 #endif 124 if ((flags & (__GFP_HIGHMEM | __GFP_MOVABLE)) == 125 (__GFP_HIGHMEM | __GFP_MOVABLE)) 126 return ZONE_MOVABLE; 127 #ifdef CONFIG_HIGHMEM 128 if (flags & __GFP_HIGHMEM) 129 return ZONE_HIGHMEM; 130 #endif 131 return ZONE_NORMAL; 132 } 133 134 /* 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 */ 140 141 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 } 148 149 /* 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. 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. 154 * 155 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets 156 * optimized to &contig_page_data at compile-time. 157 */ 158 static inline struct zonelist *node_zonelist(int nid, gfp_t flags) 159 { 160 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); 161 } 162 163 #ifndef HAVE_ARCH_FREE_PAGE 164 static inline void arch_free_page(struct page *page, int order) { } 165 #endif 166 #ifndef HAVE_ARCH_ALLOC_PAGE 167 static inline void arch_alloc_page(struct page *page, int order) { } 168 #endif 169 170 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 } 187 188 189 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, 190 unsigned int order) 191 { 192 if (unlikely(order >= MAX_ORDER)) 193 return NULL; 194 195 /* Unknown node is current node */ 196 if (nid < 0) 197 nid = numa_node_id(); 198 199 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); 200 } 201 202 #ifdef CONFIG_NUMA 203 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); 204 205 static inline struct page * 206 alloc_pages(gfp_t gfp_mask, unsigned int order) 207 { 208 if (unlikely(order >= MAX_ORDER)) 209 return NULL; 210 211 return alloc_pages_current(gfp_mask, order); 212 } 213 extern struct page *alloc_page_vma(gfp_t gfp_mask, 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) 221 222 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); 223 extern unsigned long get_zeroed_page(gfp_t gfp_mask); 224 225 void *alloc_pages_exact(size_t size, gfp_t gfp_mask); 226 void free_pages_exact(void *virt, size_t size); 227 228 #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)) 233 234 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); 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); 243 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); 244 void drain_all_pages(void); 245 void drain_local_pages(void *dummy); 246 247 #endif /* __LINUX_GFP_H */ 248