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 /* Plain integer GFP bitmasks. Do not use this directly. */ 13 #define ___GFP_DMA 0x01u 14 #define ___GFP_HIGHMEM 0x02u 15 #define ___GFP_DMA32 0x04u 16 #define ___GFP_MOVABLE 0x08u 17 #define ___GFP_WAIT 0x10u 18 #define ___GFP_HIGH 0x20u 19 #define ___GFP_IO 0x40u 20 #define ___GFP_FS 0x80u 21 #define ___GFP_COLD 0x100u 22 #define ___GFP_NOWARN 0x200u 23 #define ___GFP_REPEAT 0x400u 24 #define ___GFP_NOFAIL 0x800u 25 #define ___GFP_NORETRY 0x1000u 26 #define ___GFP_COMP 0x4000u 27 #define ___GFP_ZERO 0x8000u 28 #define ___GFP_NOMEMALLOC 0x10000u 29 #define ___GFP_HARDWALL 0x20000u 30 #define ___GFP_THISNODE 0x40000u 31 #define ___GFP_RECLAIMABLE 0x80000u 32 #ifdef CONFIG_KMEMCHECK 33 #define ___GFP_NOTRACK 0x200000u 34 #else 35 #define ___GFP_NOTRACK 0 36 #endif 37 #define ___GFP_NO_KSWAPD 0x400000u 38 39 /* 40 * GFP bitmasks.. 41 * 42 * Zone modifiers (see linux/mmzone.h - low three bits) 43 * 44 * Do not put any conditional on these. If necessary modify the definitions 45 * without the underscores and use them consistently. The definitions here may 46 * be used in bit comparisons. 47 */ 48 #define __GFP_DMA ((__force gfp_t)___GFP_DMA) 49 #define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM) 50 #define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32) 51 #define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* Page is movable */ 52 #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) 53 /* 54 * Action modifiers - doesn't change the zoning 55 * 56 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt 57 * _might_ fail. This depends upon the particular VM implementation. 58 * 59 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller 60 * cannot handle allocation failures. This modifier is deprecated and no new 61 * users should be added. 62 * 63 * __GFP_NORETRY: The VM implementation must not retry indefinitely. 64 * 65 * __GFP_MOVABLE: Flag that this page will be movable by the page migration 66 * mechanism or reclaimed 67 */ 68 #define __GFP_WAIT ((__force gfp_t)___GFP_WAIT) /* Can wait and reschedule? */ 69 #define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) /* Should access emergency pools? */ 70 #define __GFP_IO ((__force gfp_t)___GFP_IO) /* Can start physical IO? */ 71 #define __GFP_FS ((__force gfp_t)___GFP_FS) /* Can call down to low-level FS? */ 72 #define __GFP_COLD ((__force gfp_t)___GFP_COLD) /* Cache-cold page required */ 73 #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) /* Suppress page allocation failure warning */ 74 #define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */ 75 #define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */ 76 #define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */ 77 #define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */ 78 #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */ 79 #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves */ 80 #define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */ 81 #define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */ 82 #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */ 83 #define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */ 84 85 #define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD) 86 87 /* 88 * This may seem redundant, but it's a way of annotating false positives vs. 89 * allocations that simply cannot be supported (e.g. page tables). 90 */ 91 #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK) 92 93 #define __GFP_BITS_SHIFT 23 /* Room for 23 __GFP_FOO bits */ 94 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) 95 96 /* This equals 0, but use constants in case they ever change */ 97 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) 98 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ 99 #define GFP_ATOMIC (__GFP_HIGH) 100 #define GFP_NOIO (__GFP_WAIT) 101 #define GFP_NOFS (__GFP_WAIT | __GFP_IO) 102 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) 103 #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 104 __GFP_RECLAIMABLE) 105 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) 106 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ 107 __GFP_HIGHMEM) 108 #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 109 __GFP_HARDWALL | __GFP_HIGHMEM | \ 110 __GFP_MOVABLE) 111 #define GFP_IOFS (__GFP_IO | __GFP_FS) 112 #define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ 113 __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \ 114 __GFP_NO_KSWAPD) 115 116 #ifdef CONFIG_NUMA 117 #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) 118 #else 119 #define GFP_THISNODE ((__force gfp_t)0) 120 #endif 121 122 /* This mask makes up all the page movable related flags */ 123 #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) 124 125 /* Control page allocator reclaim behavior */ 126 #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ 127 __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ 128 __GFP_NORETRY|__GFP_NOMEMALLOC) 129 130 /* Control slab gfp mask during early boot */ 131 #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)) 132 133 /* Control allocation constraints */ 134 #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) 135 136 /* Do not use these with a slab allocator */ 137 #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) 138 139 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some 140 platforms, used as appropriate on others */ 141 142 #define GFP_DMA __GFP_DMA 143 144 /* 4GB DMA on some platforms */ 145 #define GFP_DMA32 __GFP_DMA32 146 147 /* Convert GFP flags to their corresponding migrate type */ 148 static inline int allocflags_to_migratetype(gfp_t gfp_flags) 149 { 150 WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); 151 152 if (unlikely(page_group_by_mobility_disabled)) 153 return MIGRATE_UNMOVABLE; 154 155 /* Group based on mobility */ 156 return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | 157 ((gfp_flags & __GFP_RECLAIMABLE) != 0); 158 } 159 160 #ifdef CONFIG_HIGHMEM 161 #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM 162 #else 163 #define OPT_ZONE_HIGHMEM ZONE_NORMAL 164 #endif 165 166 #ifdef CONFIG_ZONE_DMA 167 #define OPT_ZONE_DMA ZONE_DMA 168 #else 169 #define OPT_ZONE_DMA ZONE_NORMAL 170 #endif 171 172 #ifdef CONFIG_ZONE_DMA32 173 #define OPT_ZONE_DMA32 ZONE_DMA32 174 #else 175 #define OPT_ZONE_DMA32 ZONE_NORMAL 176 #endif 177 178 /* 179 * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the 180 * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long 181 * and there are 16 of them to cover all possible combinations of 182 * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM. 183 * 184 * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. 185 * But GFP_MOVABLE is not only a zone specifier but also an allocation 186 * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. 187 * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1". 188 * 189 * bit result 190 * ================= 191 * 0x0 => NORMAL 192 * 0x1 => DMA or NORMAL 193 * 0x2 => HIGHMEM or NORMAL 194 * 0x3 => BAD (DMA+HIGHMEM) 195 * 0x4 => DMA32 or DMA or NORMAL 196 * 0x5 => BAD (DMA+DMA32) 197 * 0x6 => BAD (HIGHMEM+DMA32) 198 * 0x7 => BAD (HIGHMEM+DMA32+DMA) 199 * 0x8 => NORMAL (MOVABLE+0) 200 * 0x9 => DMA or NORMAL (MOVABLE+DMA) 201 * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) 202 * 0xb => BAD (MOVABLE+HIGHMEM+DMA) 203 * 0xc => DMA32 (MOVABLE+HIGHMEM+DMA32) 204 * 0xd => BAD (MOVABLE+DMA32+DMA) 205 * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) 206 * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) 207 * 208 * ZONES_SHIFT must be <= 2 on 32 bit platforms. 209 */ 210 211 #if 16 * ZONES_SHIFT > BITS_PER_LONG 212 #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer 213 #endif 214 215 #define GFP_ZONE_TABLE ( \ 216 (ZONE_NORMAL << 0 * ZONES_SHIFT) \ 217 | (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT) \ 218 | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT) \ 219 | (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT) \ 220 | (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT) \ 221 | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * ZONES_SHIFT) \ 222 | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * ZONES_SHIFT) \ 223 | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * ZONES_SHIFT) \ 224 ) 225 226 /* 227 * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32 228 * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per 229 * entry starting with bit 0. Bit is set if the combination is not 230 * allowed. 231 */ 232 #define GFP_ZONE_BAD ( \ 233 1 << (___GFP_DMA | ___GFP_HIGHMEM) \ 234 | 1 << (___GFP_DMA | ___GFP_DMA32) \ 235 | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \ 236 | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \ 237 | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \ 238 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \ 239 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \ 240 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \ 241 ) 242 243 static inline enum zone_type gfp_zone(gfp_t flags) 244 { 245 enum zone_type z; 246 int bit = (__force int) (flags & GFP_ZONEMASK); 247 248 z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & 249 ((1 << ZONES_SHIFT) - 1); 250 251 if (__builtin_constant_p(bit)) 252 BUILD_BUG_ON((GFP_ZONE_BAD >> bit) & 1); 253 else { 254 #ifdef CONFIG_DEBUG_VM 255 BUG_ON((GFP_ZONE_BAD >> bit) & 1); 256 #endif 257 } 258 return z; 259 } 260 261 /* 262 * There is only one page-allocator function, and two main namespaces to 263 * it. The alloc_page*() variants return 'struct page *' and as such 264 * can allocate highmem pages, the *get*page*() variants return 265 * virtual kernel addresses to the allocated page(s). 266 */ 267 268 static inline int gfp_zonelist(gfp_t flags) 269 { 270 if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE)) 271 return 1; 272 273 return 0; 274 } 275 276 /* 277 * We get the zone list from the current node and the gfp_mask. 278 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. 279 * There are two zonelists per node, one for all zones with memory and 280 * one containing just zones from the node the zonelist belongs to. 281 * 282 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets 283 * optimized to &contig_page_data at compile-time. 284 */ 285 static inline struct zonelist *node_zonelist(int nid, gfp_t flags) 286 { 287 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); 288 } 289 290 #ifndef HAVE_ARCH_FREE_PAGE 291 static inline void arch_free_page(struct page *page, int order) { } 292 #endif 293 #ifndef HAVE_ARCH_ALLOC_PAGE 294 static inline void arch_alloc_page(struct page *page, int order) { } 295 #endif 296 297 struct page * 298 __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, 299 struct zonelist *zonelist, nodemask_t *nodemask); 300 301 static inline struct page * 302 __alloc_pages(gfp_t gfp_mask, unsigned int order, 303 struct zonelist *zonelist) 304 { 305 return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); 306 } 307 308 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, 309 unsigned int order) 310 { 311 /* Unknown node is current node */ 312 if (nid < 0) 313 nid = numa_node_id(); 314 315 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); 316 } 317 318 static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, 319 unsigned int order) 320 { 321 VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); 322 323 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); 324 } 325 326 #ifdef CONFIG_NUMA 327 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); 328 329 static inline struct page * 330 alloc_pages(gfp_t gfp_mask, unsigned int order) 331 { 332 return alloc_pages_current(gfp_mask, order); 333 } 334 extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, 335 struct vm_area_struct *vma, unsigned long addr); 336 #else 337 #define alloc_pages(gfp_mask, order) \ 338 alloc_pages_node(numa_node_id(), gfp_mask, order) 339 #define alloc_pages_vma(gfp_mask, order, vma, addr) \ 340 alloc_pages(gfp_mask, order) 341 #endif 342 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) 343 #define alloc_page_vma(gfp_mask, vma, addr) \ 344 alloc_pages_vma(gfp_mask, 0, vma, addr) 345 346 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); 347 extern unsigned long get_zeroed_page(gfp_t gfp_mask); 348 349 void *alloc_pages_exact(size_t size, gfp_t gfp_mask); 350 void free_pages_exact(void *virt, size_t size); 351 352 #define __get_free_page(gfp_mask) \ 353 __get_free_pages((gfp_mask), 0) 354 355 #define __get_dma_pages(gfp_mask, order) \ 356 __get_free_pages((gfp_mask) | GFP_DMA, (order)) 357 358 extern void __free_pages(struct page *page, unsigned int order); 359 extern void free_pages(unsigned long addr, unsigned int order); 360 extern void free_hot_cold_page(struct page *page, int cold); 361 362 #define __free_page(page) __free_pages((page), 0) 363 #define free_page(addr) free_pages((addr), 0) 364 365 void page_alloc_init(void); 366 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); 367 void drain_all_pages(void); 368 void drain_local_pages(void *dummy); 369 370 extern gfp_t gfp_allowed_mask; 371 372 extern void pm_restrict_gfp_mask(void); 373 extern void pm_restore_gfp_mask(void); 374 375 #endif /* __LINUX_GFP_H */ 376