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_MEMALLOC 0x2000u 27 #define ___GFP_COMP 0x4000u 28 #define ___GFP_ZERO 0x8000u 29 #define ___GFP_NOMEMALLOC 0x10000u 30 #define ___GFP_HARDWALL 0x20000u 31 #define ___GFP_THISNODE 0x40000u 32 #define ___GFP_RECLAIMABLE 0x80000u 33 #ifdef CONFIG_KMEMCHECK 34 #define ___GFP_NOTRACK 0x200000u 35 #else 36 #define ___GFP_NOTRACK 0 37 #endif 38 #define ___GFP_NO_KSWAPD 0x400000u 39 #define ___GFP_OTHER_NODE 0x800000u 40 #define ___GFP_WRITE 0x1000000u 41 42 /* 43 * GFP bitmasks.. 44 * 45 * Zone modifiers (see linux/mmzone.h - low three bits) 46 * 47 * Do not put any conditional on these. If necessary modify the definitions 48 * without the underscores and use them consistently. The definitions here may 49 * be used in bit comparisons. 50 */ 51 #define __GFP_DMA ((__force gfp_t)___GFP_DMA) 52 #define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM) 53 #define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32) 54 #define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* Page is movable */ 55 #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) 56 /* 57 * Action modifiers - doesn't change the zoning 58 * 59 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt 60 * _might_ fail. This depends upon the particular VM implementation. 61 * 62 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller 63 * cannot handle allocation failures. This modifier is deprecated and no new 64 * users should be added. 65 * 66 * __GFP_NORETRY: The VM implementation must not retry indefinitely. 67 * 68 * __GFP_MOVABLE: Flag that this page will be movable by the page migration 69 * mechanism or reclaimed 70 */ 71 #define __GFP_WAIT ((__force gfp_t)___GFP_WAIT) /* Can wait and reschedule? */ 72 #define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) /* Should access emergency pools? */ 73 #define __GFP_IO ((__force gfp_t)___GFP_IO) /* Can start physical IO? */ 74 #define __GFP_FS ((__force gfp_t)___GFP_FS) /* Can call down to low-level FS? */ 75 #define __GFP_COLD ((__force gfp_t)___GFP_COLD) /* Cache-cold page required */ 76 #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) /* Suppress page allocation failure warning */ 77 #define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */ 78 #define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */ 79 #define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */ 80 #define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC)/* Allow access to emergency reserves */ 81 #define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */ 82 #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */ 83 #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves. 84 * This takes precedence over the 85 * __GFP_MEMALLOC flag if both are 86 * set 87 */ 88 #define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */ 89 #define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */ 90 #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */ 91 #define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */ 92 93 #define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD) 94 #define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */ 95 #define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */ 96 97 /* 98 * This may seem redundant, but it's a way of annotating false positives vs. 99 * allocations that simply cannot be supported (e.g. page tables). 100 */ 101 #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK) 102 103 #define __GFP_BITS_SHIFT 25 /* Room for N __GFP_FOO bits */ 104 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) 105 106 /* This equals 0, but use constants in case they ever change */ 107 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) 108 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ 109 #define GFP_ATOMIC (__GFP_HIGH) 110 #define GFP_NOIO (__GFP_WAIT) 111 #define GFP_NOFS (__GFP_WAIT | __GFP_IO) 112 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) 113 #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 114 __GFP_RECLAIMABLE) 115 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) 116 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ 117 __GFP_HIGHMEM) 118 #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 119 __GFP_HARDWALL | __GFP_HIGHMEM | \ 120 __GFP_MOVABLE) 121 #define GFP_IOFS (__GFP_IO | __GFP_FS) 122 #define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ 123 __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \ 124 __GFP_NO_KSWAPD) 125 126 #ifdef CONFIG_NUMA 127 #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) 128 #else 129 #define GFP_THISNODE ((__force gfp_t)0) 130 #endif 131 132 /* This mask makes up all the page movable related flags */ 133 #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) 134 135 /* Control page allocator reclaim behavior */ 136 #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ 137 __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ 138 __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC) 139 140 /* Control slab gfp mask during early boot */ 141 #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)) 142 143 /* Control allocation constraints */ 144 #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) 145 146 /* Do not use these with a slab allocator */ 147 #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) 148 149 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some 150 platforms, used as appropriate on others */ 151 152 #define GFP_DMA __GFP_DMA 153 154 /* 4GB DMA on some platforms */ 155 #define GFP_DMA32 __GFP_DMA32 156 157 /* Convert GFP flags to their corresponding migrate type */ 158 static inline int allocflags_to_migratetype(gfp_t gfp_flags) 159 { 160 WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); 161 162 if (unlikely(page_group_by_mobility_disabled)) 163 return MIGRATE_UNMOVABLE; 164 165 /* Group based on mobility */ 166 return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | 167 ((gfp_flags & __GFP_RECLAIMABLE) != 0); 168 } 169 170 #ifdef CONFIG_HIGHMEM 171 #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM 172 #else 173 #define OPT_ZONE_HIGHMEM ZONE_NORMAL 174 #endif 175 176 #ifdef CONFIG_ZONE_DMA 177 #define OPT_ZONE_DMA ZONE_DMA 178 #else 179 #define OPT_ZONE_DMA ZONE_NORMAL 180 #endif 181 182 #ifdef CONFIG_ZONE_DMA32 183 #define OPT_ZONE_DMA32 ZONE_DMA32 184 #else 185 #define OPT_ZONE_DMA32 ZONE_NORMAL 186 #endif 187 188 /* 189 * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the 190 * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long 191 * and there are 16 of them to cover all possible combinations of 192 * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM. 193 * 194 * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. 195 * But GFP_MOVABLE is not only a zone specifier but also an allocation 196 * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. 197 * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1". 198 * 199 * bit result 200 * ================= 201 * 0x0 => NORMAL 202 * 0x1 => DMA or NORMAL 203 * 0x2 => HIGHMEM or NORMAL 204 * 0x3 => BAD (DMA+HIGHMEM) 205 * 0x4 => DMA32 or DMA or NORMAL 206 * 0x5 => BAD (DMA+DMA32) 207 * 0x6 => BAD (HIGHMEM+DMA32) 208 * 0x7 => BAD (HIGHMEM+DMA32+DMA) 209 * 0x8 => NORMAL (MOVABLE+0) 210 * 0x9 => DMA or NORMAL (MOVABLE+DMA) 211 * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) 212 * 0xb => BAD (MOVABLE+HIGHMEM+DMA) 213 * 0xc => DMA32 (MOVABLE+HIGHMEM+DMA32) 214 * 0xd => BAD (MOVABLE+DMA32+DMA) 215 * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) 216 * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) 217 * 218 * ZONES_SHIFT must be <= 2 on 32 bit platforms. 219 */ 220 221 #if 16 * ZONES_SHIFT > BITS_PER_LONG 222 #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer 223 #endif 224 225 #define GFP_ZONE_TABLE ( \ 226 (ZONE_NORMAL << 0 * ZONES_SHIFT) \ 227 | (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT) \ 228 | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT) \ 229 | (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT) \ 230 | (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT) \ 231 | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * ZONES_SHIFT) \ 232 | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * ZONES_SHIFT) \ 233 | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * ZONES_SHIFT) \ 234 ) 235 236 /* 237 * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32 238 * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per 239 * entry starting with bit 0. Bit is set if the combination is not 240 * allowed. 241 */ 242 #define GFP_ZONE_BAD ( \ 243 1 << (___GFP_DMA | ___GFP_HIGHMEM) \ 244 | 1 << (___GFP_DMA | ___GFP_DMA32) \ 245 | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \ 246 | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \ 247 | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \ 248 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \ 249 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \ 250 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \ 251 ) 252 253 static inline enum zone_type gfp_zone(gfp_t flags) 254 { 255 enum zone_type z; 256 int bit = (__force int) (flags & GFP_ZONEMASK); 257 258 z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & 259 ((1 << ZONES_SHIFT) - 1); 260 VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1); 261 return z; 262 } 263 264 /* 265 * There is only one page-allocator function, and two main namespaces to 266 * it. The alloc_page*() variants return 'struct page *' and as such 267 * can allocate highmem pages, the *get*page*() variants return 268 * virtual kernel addresses to the allocated page(s). 269 */ 270 271 static inline int gfp_zonelist(gfp_t flags) 272 { 273 if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE)) 274 return 1; 275 276 return 0; 277 } 278 279 /* 280 * We get the zone list from the current node and the gfp_mask. 281 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. 282 * There are two zonelists per node, one for all zones with memory and 283 * one containing just zones from the node the zonelist belongs to. 284 * 285 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets 286 * optimized to &contig_page_data at compile-time. 287 */ 288 static inline struct zonelist *node_zonelist(int nid, gfp_t flags) 289 { 290 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); 291 } 292 293 #ifndef HAVE_ARCH_FREE_PAGE 294 static inline void arch_free_page(struct page *page, int order) { } 295 #endif 296 #ifndef HAVE_ARCH_ALLOC_PAGE 297 static inline void arch_alloc_page(struct page *page, int order) { } 298 #endif 299 300 struct page * 301 __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, 302 struct zonelist *zonelist, nodemask_t *nodemask); 303 304 static inline struct page * 305 __alloc_pages(gfp_t gfp_mask, unsigned int order, 306 struct zonelist *zonelist) 307 { 308 return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); 309 } 310 311 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, 312 unsigned int order) 313 { 314 /* Unknown node is current node */ 315 if (nid < 0) 316 nid = numa_node_id(); 317 318 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); 319 } 320 321 static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, 322 unsigned int order) 323 { 324 VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES || !node_online(nid)); 325 326 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); 327 } 328 329 #ifdef CONFIG_NUMA 330 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); 331 332 static inline struct page * 333 alloc_pages(gfp_t gfp_mask, unsigned int order) 334 { 335 return alloc_pages_current(gfp_mask, order); 336 } 337 extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, 338 struct vm_area_struct *vma, unsigned long addr, 339 int node); 340 #else 341 #define alloc_pages(gfp_mask, order) \ 342 alloc_pages_node(numa_node_id(), gfp_mask, order) 343 #define alloc_pages_vma(gfp_mask, order, vma, addr, node) \ 344 alloc_pages(gfp_mask, order) 345 #endif 346 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) 347 #define alloc_page_vma(gfp_mask, vma, addr) \ 348 alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id()) 349 #define alloc_page_vma_node(gfp_mask, vma, addr, node) \ 350 alloc_pages_vma(gfp_mask, 0, vma, addr, node) 351 352 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); 353 extern unsigned long get_zeroed_page(gfp_t gfp_mask); 354 355 void *alloc_pages_exact(size_t size, gfp_t gfp_mask); 356 void free_pages_exact(void *virt, size_t size); 357 /* This is different from alloc_pages_exact_node !!! */ 358 void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); 359 360 #define __get_free_page(gfp_mask) \ 361 __get_free_pages((gfp_mask), 0) 362 363 #define __get_dma_pages(gfp_mask, order) \ 364 __get_free_pages((gfp_mask) | GFP_DMA, (order)) 365 366 extern void __free_pages(struct page *page, unsigned int order); 367 extern void free_pages(unsigned long addr, unsigned int order); 368 extern void free_hot_cold_page(struct page *page, int cold); 369 extern void free_hot_cold_page_list(struct list_head *list, int cold); 370 371 #define __free_page(page) __free_pages((page), 0) 372 #define free_page(addr) free_pages((addr), 0) 373 374 void page_alloc_init(void); 375 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); 376 void drain_all_pages(void); 377 void drain_local_pages(void *dummy); 378 379 /* 380 * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what 381 * GFP flags are used before interrupts are enabled. Once interrupts are 382 * enabled, it is set to __GFP_BITS_MASK while the system is running. During 383 * hibernation, it is used by PM to avoid I/O during memory allocation while 384 * devices are suspended. 385 */ 386 extern gfp_t gfp_allowed_mask; 387 388 /* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */ 389 bool gfp_pfmemalloc_allowed(gfp_t gfp_mask); 390 391 extern void pm_restrict_gfp_mask(void); 392 extern void pm_restore_gfp_mask(void); 393 394 #ifdef CONFIG_PM_SLEEP 395 extern bool pm_suspended_storage(void); 396 #else 397 static inline bool pm_suspended_storage(void) 398 { 399 return false; 400 } 401 #endif /* CONFIG_PM_SLEEP */ 402 403 #ifdef CONFIG_CMA 404 405 /* The below functions must be run on a range from a single zone. */ 406 extern int alloc_contig_range(unsigned long start, unsigned long end, 407 unsigned migratetype); 408 extern void free_contig_range(unsigned long pfn, unsigned nr_pages); 409 410 /* CMA stuff */ 411 extern void init_cma_reserved_pageblock(struct page *page); 412 413 #endif 414 415 #endif /* __LINUX_GFP_H */ 416