1 #ifndef __LINUX_GFP_H 2 #define __LINUX_GFP_H 3 4 #include <linux/mmdebug.h> 5 #include <linux/mmzone.h> 6 #include <linux/stddef.h> 7 #include <linux/linkage.h> 8 #include <linux/topology.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 #define ___GFP_NOTRACK 0x200000u 34 #define ___GFP_NO_KSWAPD 0x400000u 35 #define ___GFP_OTHER_NODE 0x800000u 36 #define ___GFP_WRITE 0x1000000u 37 /* If the above are modified, __GFP_BITS_SHIFT may need updating */ 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_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC)/* Allow access to emergency reserves */ 78 #define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */ 79 #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */ 80 #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves. 81 * This takes precedence over the 82 * __GFP_MEMALLOC flag if both are 83 * set 84 */ 85 #define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */ 86 #define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */ 87 #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */ 88 #define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */ 89 90 #define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD) 91 #define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */ 92 #define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */ 93 94 /* 95 * This may seem redundant, but it's a way of annotating false positives vs. 96 * allocations that simply cannot be supported (e.g. page tables). 97 */ 98 #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK) 99 100 #define __GFP_BITS_SHIFT 25 /* Room for N __GFP_FOO bits */ 101 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) 102 103 /* This equals 0, but use constants in case they ever change */ 104 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) 105 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ 106 #define GFP_ATOMIC (__GFP_HIGH) 107 #define GFP_NOIO (__GFP_WAIT) 108 #define GFP_NOFS (__GFP_WAIT | __GFP_IO) 109 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) 110 #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 111 __GFP_RECLAIMABLE) 112 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) 113 #define GFP_HIGHUSER (GFP_USER | __GFP_HIGHMEM) 114 #define GFP_HIGHUSER_MOVABLE (GFP_HIGHUSER | __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 /* 121 * GFP_THISNODE does not perform any reclaim, you most likely want to 122 * use __GFP_THISNODE to allocate from a given node without fallback! 123 */ 124 #ifdef CONFIG_NUMA 125 #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) 126 #else 127 #define GFP_THISNODE ((__force gfp_t)0) 128 #endif 129 130 /* This mask makes up all the page movable related flags */ 131 #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) 132 133 /* Control page allocator reclaim behavior */ 134 #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ 135 __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ 136 __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC) 137 138 /* Control slab gfp mask during early boot */ 139 #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)) 140 141 /* Control allocation constraints */ 142 #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) 143 144 /* Do not use these with a slab allocator */ 145 #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) 146 147 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some 148 platforms, used as appropriate on others */ 149 150 #define GFP_DMA __GFP_DMA 151 152 /* 4GB DMA on some platforms */ 153 #define GFP_DMA32 __GFP_DMA32 154 155 /* Convert GFP flags to their corresponding migrate type */ 156 static inline int gfpflags_to_migratetype(const gfp_t gfp_flags) 157 { 158 WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); 159 160 if (unlikely(page_group_by_mobility_disabled)) 161 return MIGRATE_UNMOVABLE; 162 163 /* Group based on mobility */ 164 return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | 165 ((gfp_flags & __GFP_RECLAIMABLE) != 0); 166 } 167 168 #ifdef CONFIG_HIGHMEM 169 #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM 170 #else 171 #define OPT_ZONE_HIGHMEM ZONE_NORMAL 172 #endif 173 174 #ifdef CONFIG_ZONE_DMA 175 #define OPT_ZONE_DMA ZONE_DMA 176 #else 177 #define OPT_ZONE_DMA ZONE_NORMAL 178 #endif 179 180 #ifdef CONFIG_ZONE_DMA32 181 #define OPT_ZONE_DMA32 ZONE_DMA32 182 #else 183 #define OPT_ZONE_DMA32 ZONE_NORMAL 184 #endif 185 186 /* 187 * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the 188 * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long 189 * and there are 16 of them to cover all possible combinations of 190 * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM. 191 * 192 * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. 193 * But GFP_MOVABLE is not only a zone specifier but also an allocation 194 * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. 195 * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1". 196 * 197 * bit result 198 * ================= 199 * 0x0 => NORMAL 200 * 0x1 => DMA or NORMAL 201 * 0x2 => HIGHMEM or NORMAL 202 * 0x3 => BAD (DMA+HIGHMEM) 203 * 0x4 => DMA32 or DMA or NORMAL 204 * 0x5 => BAD (DMA+DMA32) 205 * 0x6 => BAD (HIGHMEM+DMA32) 206 * 0x7 => BAD (HIGHMEM+DMA32+DMA) 207 * 0x8 => NORMAL (MOVABLE+0) 208 * 0x9 => DMA or NORMAL (MOVABLE+DMA) 209 * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) 210 * 0xb => BAD (MOVABLE+HIGHMEM+DMA) 211 * 0xc => DMA32 (MOVABLE+DMA32) 212 * 0xd => BAD (MOVABLE+DMA32+DMA) 213 * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) 214 * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) 215 * 216 * ZONES_SHIFT must be <= 2 on 32 bit platforms. 217 */ 218 219 #if 16 * ZONES_SHIFT > BITS_PER_LONG 220 #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer 221 #endif 222 223 #define GFP_ZONE_TABLE ( \ 224 (ZONE_NORMAL << 0 * ZONES_SHIFT) \ 225 | (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT) \ 226 | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT) \ 227 | (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT) \ 228 | (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT) \ 229 | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * ZONES_SHIFT) \ 230 | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * ZONES_SHIFT) \ 231 | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * ZONES_SHIFT) \ 232 ) 233 234 /* 235 * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32 236 * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per 237 * entry starting with bit 0. Bit is set if the combination is not 238 * allowed. 239 */ 240 #define GFP_ZONE_BAD ( \ 241 1 << (___GFP_DMA | ___GFP_HIGHMEM) \ 242 | 1 << (___GFP_DMA | ___GFP_DMA32) \ 243 | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \ 244 | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \ 245 | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \ 246 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \ 247 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \ 248 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \ 249 ) 250 251 static inline enum zone_type gfp_zone(gfp_t flags) 252 { 253 enum zone_type z; 254 int bit = (__force int) (flags & GFP_ZONEMASK); 255 256 z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & 257 ((1 << ZONES_SHIFT) - 1); 258 VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1); 259 return z; 260 } 261 262 /* 263 * There is only one page-allocator function, and two main namespaces to 264 * it. The alloc_page*() variants return 'struct page *' and as such 265 * can allocate highmem pages, the *get*page*() variants return 266 * virtual kernel addresses to the allocated page(s). 267 */ 268 269 static inline int gfp_zonelist(gfp_t flags) 270 { 271 if (IS_ENABLED(CONFIG_NUMA) && unlikely(flags & __GFP_THISNODE)) 272 return 1; 273 274 return 0; 275 } 276 277 /* 278 * We get the zone list from the current node and the gfp_mask. 279 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. 280 * There are two zonelists per node, one for all zones with memory and 281 * one containing just zones from the node the zonelist belongs to. 282 * 283 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets 284 * optimized to &contig_page_data at compile-time. 285 */ 286 static inline struct zonelist *node_zonelist(int nid, gfp_t flags) 287 { 288 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); 289 } 290 291 #ifndef HAVE_ARCH_FREE_PAGE 292 static inline void arch_free_page(struct page *page, int order) { } 293 #endif 294 #ifndef HAVE_ARCH_ALLOC_PAGE 295 static inline void arch_alloc_page(struct page *page, int order) { } 296 #endif 297 298 struct page * 299 __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, 300 struct zonelist *zonelist, nodemask_t *nodemask); 301 302 static inline struct page * 303 __alloc_pages(gfp_t gfp_mask, unsigned int order, 304 struct zonelist *zonelist) 305 { 306 return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); 307 } 308 309 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, 310 unsigned int order) 311 { 312 /* Unknown node is current node */ 313 if (nid < 0) 314 nid = numa_node_id(); 315 316 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); 317 } 318 319 static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, 320 unsigned int order) 321 { 322 VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES || !node_online(nid)); 323 324 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); 325 } 326 327 #ifdef CONFIG_NUMA 328 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); 329 330 static inline struct page * 331 alloc_pages(gfp_t gfp_mask, unsigned int order) 332 { 333 return alloc_pages_current(gfp_mask, order); 334 } 335 extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, 336 struct vm_area_struct *vma, unsigned long addr, 337 int node, bool hugepage); 338 #define alloc_hugepage_vma(gfp_mask, vma, addr, order) \ 339 alloc_pages_vma(gfp_mask, order, vma, addr, numa_node_id(), true) 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, false)\ 344 alloc_pages(gfp_mask, order) 345 #define alloc_hugepage_vma(gfp_mask, vma, addr, order) \ 346 alloc_pages(gfp_mask, order) 347 #endif 348 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) 349 #define alloc_page_vma(gfp_mask, vma, addr) \ 350 alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id(), false) 351 #define alloc_page_vma_node(gfp_mask, vma, addr, node) \ 352 alloc_pages_vma(gfp_mask, 0, vma, addr, node, false) 353 354 extern struct page *alloc_kmem_pages(gfp_t gfp_mask, unsigned int order); 355 extern struct page *alloc_kmem_pages_node(int nid, gfp_t gfp_mask, 356 unsigned int order); 357 358 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); 359 extern unsigned long get_zeroed_page(gfp_t gfp_mask); 360 361 void *alloc_pages_exact(size_t size, gfp_t gfp_mask); 362 void free_pages_exact(void *virt, size_t size); 363 /* This is different from alloc_pages_exact_node !!! */ 364 void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); 365 366 #define __get_free_page(gfp_mask) \ 367 __get_free_pages((gfp_mask), 0) 368 369 #define __get_dma_pages(gfp_mask, order) \ 370 __get_free_pages((gfp_mask) | GFP_DMA, (order)) 371 372 extern void __free_pages(struct page *page, unsigned int order); 373 extern void free_pages(unsigned long addr, unsigned int order); 374 extern void free_hot_cold_page(struct page *page, bool cold); 375 extern void free_hot_cold_page_list(struct list_head *list, bool cold); 376 377 extern void __free_kmem_pages(struct page *page, unsigned int order); 378 extern void free_kmem_pages(unsigned long addr, unsigned int order); 379 380 #define __free_page(page) __free_pages((page), 0) 381 #define free_page(addr) free_pages((addr), 0) 382 383 void page_alloc_init(void); 384 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); 385 void drain_all_pages(struct zone *zone); 386 void drain_local_pages(struct zone *zone); 387 388 /* 389 * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what 390 * GFP flags are used before interrupts are enabled. Once interrupts are 391 * enabled, it is set to __GFP_BITS_MASK while the system is running. During 392 * hibernation, it is used by PM to avoid I/O during memory allocation while 393 * devices are suspended. 394 */ 395 extern gfp_t gfp_allowed_mask; 396 397 /* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */ 398 bool gfp_pfmemalloc_allowed(gfp_t gfp_mask); 399 400 extern void pm_restrict_gfp_mask(void); 401 extern void pm_restore_gfp_mask(void); 402 403 #ifdef CONFIG_PM_SLEEP 404 extern bool pm_suspended_storage(void); 405 #else 406 static inline bool pm_suspended_storage(void) 407 { 408 return false; 409 } 410 #endif /* CONFIG_PM_SLEEP */ 411 412 #ifdef CONFIG_CMA 413 414 /* The below functions must be run on a range from a single zone. */ 415 extern int alloc_contig_range(unsigned long start, unsigned long end, 416 unsigned migratetype); 417 extern void free_contig_range(unsigned long pfn, unsigned nr_pages); 418 419 /* CMA stuff */ 420 extern void init_cma_reserved_pageblock(struct page *page); 421 422 #endif 423 424 #endif /* __LINUX_GFP_H */ 425