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