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 #include <linux/mmdebug.h> 9 10 struct vm_area_struct; 11 12 /* 13 * GFP bitmasks.. 14 * 15 * Zone modifiers (see linux/mmzone.h - low three bits) 16 * 17 * Do not put any conditional on these. If necessary modify the definitions 18 * without the underscores and use the consistently. The definitions here may 19 * be used in bit comparisons. 20 */ 21 #define __GFP_DMA ((__force gfp_t)0x01u) 22 #define __GFP_HIGHMEM ((__force gfp_t)0x02u) 23 #define __GFP_DMA32 ((__force gfp_t)0x04u) 24 #define __GFP_MOVABLE ((__force gfp_t)0x08u) /* Page is movable */ 25 #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) 26 /* 27 * Action modifiers - doesn't change the zoning 28 * 29 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt 30 * _might_ fail. This depends upon the particular VM implementation. 31 * 32 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller 33 * cannot handle allocation failures. 34 * 35 * __GFP_NORETRY: The VM implementation must not retry indefinitely. 36 * 37 * __GFP_MOVABLE: Flag that this page will be movable by the page migration 38 * mechanism or reclaimed 39 */ 40 #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ 41 #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ 42 #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ 43 #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ 44 #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ 45 #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ 46 #define __GFP_REPEAT ((__force gfp_t)0x400u) /* See above */ 47 #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */ 48 #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */ 49 #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */ 50 #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */ 51 #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */ 52 #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ 53 #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */ 54 #define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */ 55 56 #ifdef CONFIG_KMEMCHECK 57 #define __GFP_NOTRACK ((__force gfp_t)0x200000u) /* Don't track with kmemcheck */ 58 #else 59 #define __GFP_NOTRACK ((__force gfp_t)0) 60 #endif 61 62 /* 63 * This may seem redundant, but it's a way of annotating false positives vs. 64 * allocations that simply cannot be supported (e.g. page tables). 65 */ 66 #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK) 67 68 #define __GFP_BITS_SHIFT 22 /* Room for 22 __GFP_FOO bits */ 69 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) 70 71 /* This equals 0, but use constants in case they ever change */ 72 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) 73 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ 74 #define GFP_ATOMIC (__GFP_HIGH) 75 #define GFP_NOIO (__GFP_WAIT) 76 #define GFP_NOFS (__GFP_WAIT | __GFP_IO) 77 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) 78 #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 79 __GFP_RECLAIMABLE) 80 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) 81 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ 82 __GFP_HIGHMEM) 83 #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 84 __GFP_HARDWALL | __GFP_HIGHMEM | \ 85 __GFP_MOVABLE) 86 87 #ifdef CONFIG_NUMA 88 #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) 89 #else 90 #define GFP_THISNODE ((__force gfp_t)0) 91 #endif 92 93 /* This mask makes up all the page movable related flags */ 94 #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) 95 96 /* Control page allocator reclaim behavior */ 97 #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ 98 __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ 99 __GFP_NORETRY|__GFP_NOMEMALLOC) 100 101 /* Control slab gfp mask during early boot */ 102 #define GFP_BOOT_MASK __GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS) 103 104 /* Control allocation constraints */ 105 #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) 106 107 /* Do not use these with a slab allocator */ 108 #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) 109 110 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some 111 platforms, used as appropriate on others */ 112 113 #define GFP_DMA __GFP_DMA 114 115 /* 4GB DMA on some platforms */ 116 #define GFP_DMA32 __GFP_DMA32 117 118 /* Convert GFP flags to their corresponding migrate type */ 119 static inline int allocflags_to_migratetype(gfp_t gfp_flags) 120 { 121 WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); 122 123 if (unlikely(page_group_by_mobility_disabled)) 124 return MIGRATE_UNMOVABLE; 125 126 /* Group based on mobility */ 127 return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | 128 ((gfp_flags & __GFP_RECLAIMABLE) != 0); 129 } 130 131 #ifdef CONFIG_HIGHMEM 132 #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM 133 #else 134 #define OPT_ZONE_HIGHMEM ZONE_NORMAL 135 #endif 136 137 #ifdef CONFIG_ZONE_DMA 138 #define OPT_ZONE_DMA ZONE_DMA 139 #else 140 #define OPT_ZONE_DMA ZONE_NORMAL 141 #endif 142 143 #ifdef CONFIG_ZONE_DMA32 144 #define OPT_ZONE_DMA32 ZONE_DMA32 145 #else 146 #define OPT_ZONE_DMA32 ZONE_NORMAL 147 #endif 148 149 /* 150 * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the 151 * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long 152 * and there are 16 of them to cover all possible combinations of 153 * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM 154 * 155 * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. 156 * But GFP_MOVABLE is not only a zone specifier but also an allocation 157 * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. 158 * Only 1bit of the lowest 3 bit (DMA,DMA32,HIGHMEM) can be set to "1". 159 * 160 * bit result 161 * ================= 162 * 0x0 => NORMAL 163 * 0x1 => DMA or NORMAL 164 * 0x2 => HIGHMEM or NORMAL 165 * 0x3 => BAD (DMA+HIGHMEM) 166 * 0x4 => DMA32 or DMA or NORMAL 167 * 0x5 => BAD (DMA+DMA32) 168 * 0x6 => BAD (HIGHMEM+DMA32) 169 * 0x7 => BAD (HIGHMEM+DMA32+DMA) 170 * 0x8 => NORMAL (MOVABLE+0) 171 * 0x9 => DMA or NORMAL (MOVABLE+DMA) 172 * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) 173 * 0xb => BAD (MOVABLE+HIGHMEM+DMA) 174 * 0xc => DMA32 (MOVABLE+HIGHMEM+DMA32) 175 * 0xd => BAD (MOVABLE+DMA32+DMA) 176 * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) 177 * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) 178 * 179 * ZONES_SHIFT must be <= 2 on 32 bit platforms. 180 */ 181 182 #if 16 * ZONES_SHIFT > BITS_PER_LONG 183 #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer 184 #endif 185 186 #define GFP_ZONE_TABLE ( \ 187 (ZONE_NORMAL << 0 * ZONES_SHIFT) \ 188 | (OPT_ZONE_DMA << __GFP_DMA * ZONES_SHIFT) \ 189 | (OPT_ZONE_HIGHMEM << __GFP_HIGHMEM * ZONES_SHIFT) \ 190 | (OPT_ZONE_DMA32 << __GFP_DMA32 * ZONES_SHIFT) \ 191 | (ZONE_NORMAL << __GFP_MOVABLE * ZONES_SHIFT) \ 192 | (OPT_ZONE_DMA << (__GFP_MOVABLE | __GFP_DMA) * ZONES_SHIFT) \ 193 | (ZONE_MOVABLE << (__GFP_MOVABLE | __GFP_HIGHMEM) * ZONES_SHIFT)\ 194 | (OPT_ZONE_DMA32 << (__GFP_MOVABLE | __GFP_DMA32) * ZONES_SHIFT)\ 195 ) 196 197 /* 198 * GFP_ZONE_BAD is a bitmap for all combination of __GFP_DMA, __GFP_DMA32 199 * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per 200 * entry starting with bit 0. Bit is set if the combination is not 201 * allowed. 202 */ 203 #define GFP_ZONE_BAD ( \ 204 1 << (__GFP_DMA | __GFP_HIGHMEM) \ 205 | 1 << (__GFP_DMA | __GFP_DMA32) \ 206 | 1 << (__GFP_DMA32 | __GFP_HIGHMEM) \ 207 | 1 << (__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM) \ 208 | 1 << (__GFP_MOVABLE | __GFP_HIGHMEM | __GFP_DMA) \ 209 | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_DMA) \ 210 | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_HIGHMEM) \ 211 | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_DMA | __GFP_HIGHMEM)\ 212 ) 213 214 static inline enum zone_type gfp_zone(gfp_t flags) 215 { 216 enum zone_type z; 217 int bit = flags & GFP_ZONEMASK; 218 219 z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & 220 ((1 << ZONES_SHIFT) - 1); 221 222 if (__builtin_constant_p(bit)) 223 MAYBE_BUILD_BUG_ON((GFP_ZONE_BAD >> bit) & 1); 224 else { 225 #ifdef CONFIG_DEBUG_VM 226 BUG_ON((GFP_ZONE_BAD >> bit) & 1); 227 #endif 228 } 229 return z; 230 } 231 232 /* 233 * There is only one page-allocator function, and two main namespaces to 234 * it. The alloc_page*() variants return 'struct page *' and as such 235 * can allocate highmem pages, the *get*page*() variants return 236 * virtual kernel addresses to the allocated page(s). 237 */ 238 239 static inline int gfp_zonelist(gfp_t flags) 240 { 241 if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE)) 242 return 1; 243 244 return 0; 245 } 246 247 /* 248 * We get the zone list from the current node and the gfp_mask. 249 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. 250 * There are two zonelists per node, one for all zones with memory and 251 * one containing just zones from the node the zonelist belongs to. 252 * 253 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets 254 * optimized to &contig_page_data at compile-time. 255 */ 256 static inline struct zonelist *node_zonelist(int nid, gfp_t flags) 257 { 258 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); 259 } 260 261 #ifndef HAVE_ARCH_FREE_PAGE 262 static inline void arch_free_page(struct page *page, int order) { } 263 #endif 264 #ifndef HAVE_ARCH_ALLOC_PAGE 265 static inline void arch_alloc_page(struct page *page, int order) { } 266 #endif 267 268 struct page * 269 __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, 270 struct zonelist *zonelist, nodemask_t *nodemask); 271 272 static inline struct page * 273 __alloc_pages(gfp_t gfp_mask, unsigned int order, 274 struct zonelist *zonelist) 275 { 276 return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); 277 } 278 279 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, 280 unsigned int order) 281 { 282 /* Unknown node is current node */ 283 if (nid < 0) 284 nid = numa_node_id(); 285 286 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); 287 } 288 289 static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, 290 unsigned int order) 291 { 292 VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); 293 294 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); 295 } 296 297 #ifdef CONFIG_NUMA 298 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); 299 300 static inline struct page * 301 alloc_pages(gfp_t gfp_mask, unsigned int order) 302 { 303 return alloc_pages_current(gfp_mask, order); 304 } 305 extern struct page *alloc_page_vma(gfp_t gfp_mask, 306 struct vm_area_struct *vma, unsigned long addr); 307 #else 308 #define alloc_pages(gfp_mask, order) \ 309 alloc_pages_node(numa_node_id(), gfp_mask, order) 310 #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) 311 #endif 312 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) 313 314 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); 315 extern unsigned long get_zeroed_page(gfp_t gfp_mask); 316 317 void *alloc_pages_exact(size_t size, gfp_t gfp_mask); 318 void free_pages_exact(void *virt, size_t size); 319 320 #define __get_free_page(gfp_mask) \ 321 __get_free_pages((gfp_mask),0) 322 323 #define __get_dma_pages(gfp_mask, order) \ 324 __get_free_pages((gfp_mask) | GFP_DMA,(order)) 325 326 extern void __free_pages(struct page *page, unsigned int order); 327 extern void free_pages(unsigned long addr, unsigned int order); 328 extern void free_hot_page(struct page *page); 329 330 #define __free_page(page) __free_pages((page), 0) 331 #define free_page(addr) free_pages((addr),0) 332 333 void page_alloc_init(void); 334 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); 335 void drain_all_pages(void); 336 void drain_local_pages(void *dummy); 337 338 extern gfp_t gfp_allowed_mask; 339 340 static inline void set_gfp_allowed_mask(gfp_t mask) 341 { 342 gfp_allowed_mask = mask; 343 } 344 345 #endif /* __LINUX_GFP_H */ 346