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 #define ___GFP_OTHER_NODE 0x800000u 39 #define ___GFP_WRITE 0x1000000u 40 41 /* 42 * GFP bitmasks.. 43 * 44 * Zone modifiers (see linux/mmzone.h - low three bits) 45 * 46 * Do not put any conditional on these. If necessary modify the definitions 47 * without the underscores and use them consistently. The definitions here may 48 * be used in bit comparisons. 49 */ 50 #define __GFP_DMA ((__force gfp_t)___GFP_DMA) 51 #define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM) 52 #define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32) 53 #define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* Page is movable */ 54 #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) 55 /* 56 * Action modifiers - doesn't change the zoning 57 * 58 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt 59 * _might_ fail. This depends upon the particular VM implementation. 60 * 61 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller 62 * cannot handle allocation failures. This modifier is deprecated and no new 63 * users should be added. 64 * 65 * __GFP_NORETRY: The VM implementation must not retry indefinitely. 66 * 67 * __GFP_MOVABLE: Flag that this page will be movable by the page migration 68 * mechanism or reclaimed 69 */ 70 #define __GFP_WAIT ((__force gfp_t)___GFP_WAIT) /* Can wait and reschedule? */ 71 #define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) /* Should access emergency pools? */ 72 #define __GFP_IO ((__force gfp_t)___GFP_IO) /* Can start physical IO? */ 73 #define __GFP_FS ((__force gfp_t)___GFP_FS) /* Can call down to low-level FS? */ 74 #define __GFP_COLD ((__force gfp_t)___GFP_COLD) /* Cache-cold page required */ 75 #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) /* Suppress page allocation failure warning */ 76 #define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */ 77 #define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */ 78 #define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */ 79 #define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */ 80 #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */ 81 #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves */ 82 #define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */ 83 #define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */ 84 #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */ 85 #define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */ 86 87 #define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD) 88 #define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */ 89 #define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */ 90 91 /* 92 * This may seem redundant, but it's a way of annotating false positives vs. 93 * allocations that simply cannot be supported (e.g. page tables). 94 */ 95 #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK) 96 97 #define __GFP_BITS_SHIFT 25 /* Room for N __GFP_FOO bits */ 98 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) 99 100 /* This equals 0, but use constants in case they ever change */ 101 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) 102 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ 103 #define GFP_ATOMIC (__GFP_HIGH) 104 #define GFP_NOIO (__GFP_WAIT) 105 #define GFP_NOFS (__GFP_WAIT | __GFP_IO) 106 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) 107 #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 108 __GFP_RECLAIMABLE) 109 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) 110 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ 111 __GFP_HIGHMEM) 112 #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 113 __GFP_HARDWALL | __GFP_HIGHMEM | \ 114 __GFP_MOVABLE) 115 #define GFP_IOFS (__GFP_IO | __GFP_FS) 116 #define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ 117 __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \ 118 __GFP_NO_KSWAPD) 119 120 #ifdef CONFIG_NUMA 121 #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) 122 #else 123 #define GFP_THISNODE ((__force gfp_t)0) 124 #endif 125 126 /* This mask makes up all the page movable related flags */ 127 #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) 128 129 /* Control page allocator reclaim behavior */ 130 #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ 131 __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ 132 __GFP_NORETRY|__GFP_NOMEMALLOC) 133 134 /* Control slab gfp mask during early boot */ 135 #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)) 136 137 /* Control allocation constraints */ 138 #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) 139 140 /* Do not use these with a slab allocator */ 141 #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) 142 143 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some 144 platforms, used as appropriate on others */ 145 146 #define GFP_DMA __GFP_DMA 147 148 /* 4GB DMA on some platforms */ 149 #define GFP_DMA32 __GFP_DMA32 150 151 /* Convert GFP flags to their corresponding migrate type */ 152 static inline int allocflags_to_migratetype(gfp_t gfp_flags) 153 { 154 WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); 155 156 if (unlikely(page_group_by_mobility_disabled)) 157 return MIGRATE_UNMOVABLE; 158 159 /* Group based on mobility */ 160 return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | 161 ((gfp_flags & __GFP_RECLAIMABLE) != 0); 162 } 163 164 #ifdef CONFIG_HIGHMEM 165 #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM 166 #else 167 #define OPT_ZONE_HIGHMEM ZONE_NORMAL 168 #endif 169 170 #ifdef CONFIG_ZONE_DMA 171 #define OPT_ZONE_DMA ZONE_DMA 172 #else 173 #define OPT_ZONE_DMA ZONE_NORMAL 174 #endif 175 176 #ifdef CONFIG_ZONE_DMA32 177 #define OPT_ZONE_DMA32 ZONE_DMA32 178 #else 179 #define OPT_ZONE_DMA32 ZONE_NORMAL 180 #endif 181 182 /* 183 * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the 184 * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long 185 * and there are 16 of them to cover all possible combinations of 186 * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM. 187 * 188 * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. 189 * But GFP_MOVABLE is not only a zone specifier but also an allocation 190 * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. 191 * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1". 192 * 193 * bit result 194 * ================= 195 * 0x0 => NORMAL 196 * 0x1 => DMA or NORMAL 197 * 0x2 => HIGHMEM or NORMAL 198 * 0x3 => BAD (DMA+HIGHMEM) 199 * 0x4 => DMA32 or DMA or NORMAL 200 * 0x5 => BAD (DMA+DMA32) 201 * 0x6 => BAD (HIGHMEM+DMA32) 202 * 0x7 => BAD (HIGHMEM+DMA32+DMA) 203 * 0x8 => NORMAL (MOVABLE+0) 204 * 0x9 => DMA or NORMAL (MOVABLE+DMA) 205 * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) 206 * 0xb => BAD (MOVABLE+HIGHMEM+DMA) 207 * 0xc => DMA32 (MOVABLE+HIGHMEM+DMA32) 208 * 0xd => BAD (MOVABLE+DMA32+DMA) 209 * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) 210 * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) 211 * 212 * ZONES_SHIFT must be <= 2 on 32 bit platforms. 213 */ 214 215 #if 16 * ZONES_SHIFT > BITS_PER_LONG 216 #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer 217 #endif 218 219 #define GFP_ZONE_TABLE ( \ 220 (ZONE_NORMAL << 0 * ZONES_SHIFT) \ 221 | (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT) \ 222 | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT) \ 223 | (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT) \ 224 | (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT) \ 225 | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * ZONES_SHIFT) \ 226 | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * ZONES_SHIFT) \ 227 | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * ZONES_SHIFT) \ 228 ) 229 230 /* 231 * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32 232 * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per 233 * entry starting with bit 0. Bit is set if the combination is not 234 * allowed. 235 */ 236 #define GFP_ZONE_BAD ( \ 237 1 << (___GFP_DMA | ___GFP_HIGHMEM) \ 238 | 1 << (___GFP_DMA | ___GFP_DMA32) \ 239 | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \ 240 | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \ 241 | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \ 242 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \ 243 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \ 244 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \ 245 ) 246 247 static inline enum zone_type gfp_zone(gfp_t flags) 248 { 249 enum zone_type z; 250 int bit = (__force int) (flags & GFP_ZONEMASK); 251 252 z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & 253 ((1 << ZONES_SHIFT) - 1); 254 VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1); 255 return z; 256 } 257 258 /* 259 * There is only one page-allocator function, and two main namespaces to 260 * it. The alloc_page*() variants return 'struct page *' and as such 261 * can allocate highmem pages, the *get*page*() variants return 262 * virtual kernel addresses to the allocated page(s). 263 */ 264 265 static inline int gfp_zonelist(gfp_t flags) 266 { 267 if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE)) 268 return 1; 269 270 return 0; 271 } 272 273 /* 274 * We get the zone list from the current node and the gfp_mask. 275 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. 276 * There are two zonelists per node, one for all zones with memory and 277 * one containing just zones from the node the zonelist belongs to. 278 * 279 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets 280 * optimized to &contig_page_data at compile-time. 281 */ 282 static inline struct zonelist *node_zonelist(int nid, gfp_t flags) 283 { 284 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); 285 } 286 287 #ifndef HAVE_ARCH_FREE_PAGE 288 static inline void arch_free_page(struct page *page, int order) { } 289 #endif 290 #ifndef HAVE_ARCH_ALLOC_PAGE 291 static inline void arch_alloc_page(struct page *page, int order) { } 292 #endif 293 294 struct page * 295 __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, 296 struct zonelist *zonelist, nodemask_t *nodemask); 297 298 static inline struct page * 299 __alloc_pages(gfp_t gfp_mask, unsigned int order, 300 struct zonelist *zonelist) 301 { 302 return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); 303 } 304 305 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, 306 unsigned int order) 307 { 308 /* Unknown node is current node */ 309 if (nid < 0) 310 nid = numa_node_id(); 311 312 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); 313 } 314 315 static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, 316 unsigned int order) 317 { 318 VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES || !node_online(nid)); 319 320 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); 321 } 322 323 #ifdef CONFIG_NUMA 324 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); 325 326 static inline struct page * 327 alloc_pages(gfp_t gfp_mask, unsigned int order) 328 { 329 return alloc_pages_current(gfp_mask, order); 330 } 331 extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, 332 struct vm_area_struct *vma, unsigned long addr, 333 int node); 334 #else 335 #define alloc_pages(gfp_mask, order) \ 336 alloc_pages_node(numa_node_id(), gfp_mask, order) 337 #define alloc_pages_vma(gfp_mask, order, vma, addr, node) \ 338 alloc_pages(gfp_mask, order) 339 #endif 340 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) 341 #define alloc_page_vma(gfp_mask, vma, addr) \ 342 alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id()) 343 #define alloc_page_vma_node(gfp_mask, vma, addr, node) \ 344 alloc_pages_vma(gfp_mask, 0, vma, addr, node) 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 /* This is different from alloc_pages_exact_node !!! */ 352 void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); 353 354 #define __get_free_page(gfp_mask) \ 355 __get_free_pages((gfp_mask), 0) 356 357 #define __get_dma_pages(gfp_mask, order) \ 358 __get_free_pages((gfp_mask) | GFP_DMA, (order)) 359 360 extern void __free_pages(struct page *page, unsigned int order); 361 extern void free_pages(unsigned long addr, unsigned int order); 362 extern void free_hot_cold_page(struct page *page, int cold); 363 extern void free_hot_cold_page_list(struct list_head *list, int cold); 364 365 #define __free_page(page) __free_pages((page), 0) 366 #define free_page(addr) free_pages((addr), 0) 367 368 void page_alloc_init(void); 369 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); 370 void drain_all_pages(void); 371 void drain_local_pages(void *dummy); 372 373 /* 374 * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what 375 * GFP flags are used before interrupts are enabled. Once interrupts are 376 * enabled, it is set to __GFP_BITS_MASK while the system is running. During 377 * hibernation, it is used by PM to avoid I/O during memory allocation while 378 * devices are suspended. 379 */ 380 extern gfp_t gfp_allowed_mask; 381 382 extern void pm_restrict_gfp_mask(void); 383 extern void pm_restore_gfp_mask(void); 384 385 #ifdef CONFIG_PM_SLEEP 386 extern bool pm_suspended_storage(void); 387 #else 388 static inline bool pm_suspended_storage(void) 389 { 390 return false; 391 } 392 #endif /* CONFIG_PM_SLEEP */ 393 394 #endif /* __LINUX_GFP_H */ 395