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 #include <linux/topology.h> 8 9 struct vm_area_struct; 10 11 /* 12 * GFP bitmasks.. 13 * 14 * Zone modifiers (see linux/mmzone.h - low three bits) 15 * 16 * Do not put any conditional on these. If necessary modify the definitions 17 * without the underscores and use the consistently. The definitions here may 18 * be used in bit comparisons. 19 */ 20 #define __GFP_DMA ((__force gfp_t)0x01u) 21 #define __GFP_HIGHMEM ((__force gfp_t)0x02u) 22 #define __GFP_DMA32 ((__force gfp_t)0x04u) 23 24 /* 25 * Action modifiers - doesn't change the zoning 26 * 27 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt 28 * _might_ fail. This depends upon the particular VM implementation. 29 * 30 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller 31 * cannot handle allocation failures. 32 * 33 * __GFP_NORETRY: The VM implementation must not retry indefinitely. 34 * 35 * __GFP_MOVABLE: Flag that this page will be movable by the page migration 36 * mechanism or reclaimed 37 */ 38 #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ 39 #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ 40 #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ 41 #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ 42 #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ 43 #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ 44 #define __GFP_REPEAT ((__force gfp_t)0x400u) /* See above */ 45 #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */ 46 #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */ 47 #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */ 48 #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */ 49 #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */ 50 #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ 51 #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */ 52 #define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */ 53 #define __GFP_MOVABLE ((__force gfp_t)0x100000u) /* Page is movable */ 54 55 #define __GFP_BITS_SHIFT 21 /* Room for 21 __GFP_FOO bits */ 56 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) 57 58 /* This equals 0, but use constants in case they ever change */ 59 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) 60 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ 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) 65 #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 66 __GFP_RECLAIMABLE) 67 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) 68 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ 69 __GFP_HIGHMEM) 70 #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 71 __GFP_HARDWALL | __GFP_HIGHMEM | \ 72 __GFP_MOVABLE) 73 74 #ifdef CONFIG_NUMA 75 #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) 76 #else 77 #define GFP_THISNODE ((__force gfp_t)0) 78 #endif 79 80 /* This mask makes up all the page movable related flags */ 81 #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) 82 83 /* Control page allocator reclaim behavior */ 84 #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ 85 __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ 86 __GFP_NORETRY|__GFP_NOMEMALLOC) 87 88 /* Control allocation constraints */ 89 #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) 90 91 /* Do not use these with a slab allocator */ 92 #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) 93 94 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some 95 platforms, used as appropriate on others */ 96 97 #define GFP_DMA __GFP_DMA 98 99 /* 4GB DMA on some platforms */ 100 #define GFP_DMA32 __GFP_DMA32 101 102 /* Convert GFP flags to their corresponding migrate type */ 103 static inline int allocflags_to_migratetype(gfp_t gfp_flags) 104 { 105 WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); 106 107 if (unlikely(page_group_by_mobility_disabled)) 108 return MIGRATE_UNMOVABLE; 109 110 /* Group based on mobility */ 111 return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | 112 ((gfp_flags & __GFP_RECLAIMABLE) != 0); 113 } 114 115 static inline enum zone_type gfp_zone(gfp_t flags) 116 { 117 #ifdef CONFIG_ZONE_DMA 118 if (flags & __GFP_DMA) 119 return ZONE_DMA; 120 #endif 121 #ifdef CONFIG_ZONE_DMA32 122 if (flags & __GFP_DMA32) 123 return ZONE_DMA32; 124 #endif 125 if ((flags & (__GFP_HIGHMEM | __GFP_MOVABLE)) == 126 (__GFP_HIGHMEM | __GFP_MOVABLE)) 127 return ZONE_MOVABLE; 128 #ifdef CONFIG_HIGHMEM 129 if (flags & __GFP_HIGHMEM) 130 return ZONE_HIGHMEM; 131 #endif 132 return ZONE_NORMAL; 133 } 134 135 /* 136 * There is only one page-allocator function, and two main namespaces to 137 * it. The alloc_page*() variants return 'struct page *' and as such 138 * can allocate highmem pages, the *get*page*() variants return 139 * virtual kernel addresses to the allocated page(s). 140 */ 141 142 static inline int gfp_zonelist(gfp_t flags) 143 { 144 if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE)) 145 return 1; 146 147 return 0; 148 } 149 150 /* 151 * We get the zone list from the current node and the gfp_mask. 152 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. 153 * There are two zonelists per node, one for all zones with memory and 154 * one containing just zones from the node the zonelist belongs to. 155 * 156 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets 157 * optimized to &contig_page_data at compile-time. 158 */ 159 static inline struct zonelist *node_zonelist(int nid, gfp_t flags) 160 { 161 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); 162 } 163 164 #ifndef HAVE_ARCH_FREE_PAGE 165 static inline void arch_free_page(struct page *page, int order) { } 166 #endif 167 #ifndef HAVE_ARCH_ALLOC_PAGE 168 static inline void arch_alloc_page(struct page *page, int order) { } 169 #endif 170 171 struct page * 172 __alloc_pages_internal(gfp_t gfp_mask, unsigned int order, 173 struct zonelist *zonelist, nodemask_t *nodemask); 174 175 static inline struct page * 176 __alloc_pages(gfp_t gfp_mask, unsigned int order, 177 struct zonelist *zonelist) 178 { 179 return __alloc_pages_internal(gfp_mask, order, zonelist, NULL); 180 } 181 182 static inline struct page * 183 __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, 184 struct zonelist *zonelist, nodemask_t *nodemask) 185 { 186 return __alloc_pages_internal(gfp_mask, order, zonelist, nodemask); 187 } 188 189 190 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, 191 unsigned int order) 192 { 193 if (unlikely(order >= MAX_ORDER)) 194 return NULL; 195 196 /* Unknown node is current node */ 197 if (nid < 0) 198 nid = numa_node_id(); 199 200 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); 201 } 202 203 #ifdef CONFIG_NUMA 204 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); 205 206 static inline struct page * 207 alloc_pages(gfp_t gfp_mask, unsigned int order) 208 { 209 if (unlikely(order >= MAX_ORDER)) 210 return NULL; 211 212 return alloc_pages_current(gfp_mask, order); 213 } 214 extern struct page *alloc_page_vma(gfp_t gfp_mask, 215 struct vm_area_struct *vma, unsigned long addr); 216 #else 217 #define alloc_pages(gfp_mask, order) \ 218 alloc_pages_node(numa_node_id(), gfp_mask, order) 219 #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) 220 #endif 221 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) 222 223 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); 224 extern unsigned long get_zeroed_page(gfp_t gfp_mask); 225 226 void *alloc_pages_exact(size_t size, gfp_t gfp_mask); 227 void free_pages_exact(void *virt, size_t size); 228 229 #define __get_free_page(gfp_mask) \ 230 __get_free_pages((gfp_mask),0) 231 232 #define __get_dma_pages(gfp_mask, order) \ 233 __get_free_pages((gfp_mask) | GFP_DMA,(order)) 234 235 extern void __free_pages(struct page *page, unsigned int order); 236 extern void free_pages(unsigned long addr, unsigned int order); 237 extern void free_hot_page(struct page *page); 238 extern void free_cold_page(struct page *page); 239 240 #define __free_page(page) __free_pages((page), 0) 241 #define free_page(addr) free_pages((addr),0) 242 243 void page_alloc_init(void); 244 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); 245 void drain_all_pages(void); 246 void drain_local_pages(void *dummy); 247 248 #endif /* __LINUX_GFP_H */ 249