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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007
8struct vm_area_struct;
9
10/*
11 * GFP bitmasks..
Christoph Lametere53ef382006-09-25 23:31:14 -070012 *
13 * Zone modifiers (see linux/mmzone.h - low three bits)
14 *
Christoph Lametere53ef382006-09-25 23:31:14 -070015 * Do not put any conditional on these. If necessary modify the definitions
16 * without the underscores and use the consistently. The definitions here may
17 * be used in bit comparisons.
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 */
Al Viroaf4ca452005-10-21 02:55:38 -040019#define __GFP_DMA ((__force gfp_t)0x01u)
20#define __GFP_HIGHMEM ((__force gfp_t)0x02u)
Christoph Lametere53ef382006-09-25 23:31:14 -070021#define __GFP_DMA32 ((__force gfp_t)0x04u)
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23/*
24 * Action modifiers - doesn't change the zoning
25 *
26 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
27 * _might_ fail. This depends upon the particular VM implementation.
28 *
29 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
30 * cannot handle allocation failures.
31 *
32 * __GFP_NORETRY: The VM implementation must not retry indefinitely.
Mel Gorman769848c2007-07-17 04:03:05 -070033 *
34 * __GFP_MOVABLE: Flag that this page will be movable by the page migration
35 * mechanism or reclaimed
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 */
Al Viroaf4ca452005-10-21 02:55:38 -040037#define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */
38#define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */
39#define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */
40#define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */
41#define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */
42#define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */
Nishanth Aravamudanab857d02008-04-29 00:58:23 -070043#define __GFP_REPEAT ((__force gfp_t)0x400u) /* See above */
44#define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */
45#define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */
Al Viroaf4ca452005-10-21 02:55:38 -040046#define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */
47#define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
48#define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
Paul Jackson2d6c6662005-11-13 16:06:44 -080049#define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
Christoph Lameter9b819d22006-09-25 23:31:40 -070050#define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */
Mel Gormane12ba742007-10-16 01:25:52 -070051#define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */
52#define __GFP_MOVABLE ((__force gfp_t)0x100000u) /* Page is movable */
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Mel Gormane12ba742007-10-16 01:25:52 -070054#define __GFP_BITS_SHIFT 21 /* Room for 21 __GFP_FOO bits */
Al Viroaf4ca452005-10-21 02:55:38 -040055#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Jeff Dike7b04d712006-04-10 22:53:27 -070057/* This equals 0, but use constants in case they ever change */
58#define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
Paul Jackson4eac9152006-01-11 12:17:19 -080059/* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#define GFP_ATOMIC (__GFP_HIGH)
61#define GFP_NOIO (__GFP_WAIT)
62#define GFP_NOFS (__GFP_WAIT | __GFP_IO)
63#define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
Mel Gormane12ba742007-10-16 01:25:52 -070064#define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \
65 __GFP_RECLAIMABLE)
Paul Jacksonf90b1d22005-09-06 15:18:10 -070066#define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
67#define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
68 __GFP_HIGHMEM)
Mel Gorman769848c2007-07-17 04:03:05 -070069#define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
70 __GFP_HARDWALL | __GFP_HIGHMEM | \
71 __GFP_MOVABLE)
72#define GFP_NOFS_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_MOVABLE)
73#define GFP_USER_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
74 __GFP_HARDWALL | __GFP_MOVABLE)
75#define GFP_HIGHUSER_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
76 __GFP_HARDWALL | __GFP_HIGHMEM | \
77 __GFP_MOVABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Christoph Lameter77f700d2006-09-27 01:50:07 -070079#ifdef CONFIG_NUMA
Christoph Lameter980128f2006-09-25 23:31:46 -070080#define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
Christoph Lameter77f700d2006-09-27 01:50:07 -070081#else
Al Virof2e97df2007-02-09 16:38:55 +000082#define GFP_THISNODE ((__force gfp_t)0)
Christoph Lameter77f700d2006-09-27 01:50:07 -070083#endif
84
Christoph Lameter6cb06222007-10-16 01:25:41 -070085/* This mask makes up all the page movable related flags */
Mel Gormane12ba742007-10-16 01:25:52 -070086#define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
Christoph Lameter6cb06222007-10-16 01:25:41 -070087
88/* Control page allocator reclaim behavior */
89#define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
90 __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
91 __GFP_NORETRY|__GFP_NOMEMALLOC)
92
93/* Control allocation constraints */
94#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
95
96/* Do not use these with a slab allocator */
97#define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
Christoph Lameter980128f2006-09-25 23:31:46 -070098
Linus Torvalds1da177e2005-04-16 15:20:36 -070099/* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
100 platforms, used as appropriate on others */
101
102#define GFP_DMA __GFP_DMA
103
Andi Kleena2f1b422005-11-05 17:25:53 +0100104/* 4GB DMA on some platforms */
105#define GFP_DMA32 __GFP_DMA32
106
Mel Gorman467c9962007-10-16 01:26:02 -0700107/* Convert GFP flags to their corresponding migrate type */
108static inline int allocflags_to_migratetype(gfp_t gfp_flags)
109{
110 WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
111
112 if (unlikely(page_group_by_mobility_disabled))
113 return MIGRATE_UNMOVABLE;
114
115 /* Group based on mobility */
116 return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) |
117 ((gfp_flags & __GFP_RECLAIMABLE) != 0);
118}
Andi Kleena2f1b422005-11-05 17:25:53 +0100119
Christoph Lameter19655d32006-09-25 23:31:19 -0700120static inline enum zone_type gfp_zone(gfp_t flags)
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700121{
Christoph Lameter4b51d662007-02-10 01:43:10 -0800122#ifdef CONFIG_ZONE_DMA
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700123 if (flags & __GFP_DMA)
KAMEZAWA Hiroyuki8cece852008-04-28 02:13:36 -0700124 return ZONE_DMA;
Christoph Lameter4b51d662007-02-10 01:43:10 -0800125#endif
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700126#ifdef CONFIG_ZONE_DMA32
127 if (flags & __GFP_DMA32)
KAMEZAWA Hiroyuki8cece852008-04-28 02:13:36 -0700128 return ZONE_DMA32;
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700129#endif
Mel Gorman2a1e2742007-07-17 04:03:12 -0700130 if ((flags & (__GFP_HIGHMEM | __GFP_MOVABLE)) ==
131 (__GFP_HIGHMEM | __GFP_MOVABLE))
KAMEZAWA Hiroyuki8cece852008-04-28 02:13:36 -0700132 return ZONE_MOVABLE;
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700133#ifdef CONFIG_HIGHMEM
134 if (flags & __GFP_HIGHMEM)
KAMEZAWA Hiroyuki8cece852008-04-28 02:13:36 -0700135 return ZONE_HIGHMEM;
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700136#endif
KAMEZAWA Hiroyuki8cece852008-04-28 02:13:36 -0700137 return ZONE_NORMAL;
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700138}
139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140/*
141 * There is only one page-allocator function, and two main namespaces to
142 * it. The alloc_page*() variants return 'struct page *' and as such
143 * can allocate highmem pages, the *get*page*() variants return
144 * virtual kernel addresses to the allocated page(s).
145 */
146
Mel Gorman54a6eb52008-04-28 02:12:16 -0700147static inline int gfp_zonelist(gfp_t flags)
148{
149 if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE))
150 return 1;
151
152 return 0;
153}
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155/*
156 * We get the zone list from the current node and the gfp_mask.
157 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
Mel Gorman54a6eb52008-04-28 02:12:16 -0700158 * There are two zonelists per node, one for all zones with memory and
159 * one containing just zones from the node the zonelist belongs to.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 *
161 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
162 * optimized to &contig_page_data at compile-time.
163 */
Mel Gorman0e884602008-04-28 02:12:14 -0700164static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
165{
Mel Gorman54a6eb52008-04-28 02:12:16 -0700166 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
Mel Gorman0e884602008-04-28 02:12:14 -0700167}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169#ifndef HAVE_ARCH_FREE_PAGE
170static inline void arch_free_page(struct page *page, int order) { }
171#endif
Nick Piggincc1025092006-12-06 20:32:00 -0800172#ifndef HAVE_ARCH_ALLOC_PAGE
173static inline void arch_alloc_page(struct page *page, int order) { }
174#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800176extern struct page *__alloc_pages(gfp_t, unsigned int, struct zonelist *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Mel Gorman19770b32008-04-28 02:12:18 -0700178extern struct page *
179__alloc_pages_nodemask(gfp_t, unsigned int,
180 struct zonelist *, nodemask_t *nodemask);
181
Al Virodd0fc662005-10-07 07:46:04 +0100182static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 unsigned int order)
184{
185 if (unlikely(order >= MAX_ORDER))
186 return NULL;
187
Andi Kleen819a6922006-01-11 22:43:45 +0100188 /* Unknown node is current node */
189 if (nid < 0)
190 nid = numa_node_id();
191
Mel Gorman0e884602008-04-28 02:12:14 -0700192 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
194
195#ifdef CONFIG_NUMA
Al Virodd0fc662005-10-07 07:46:04 +0100196extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198static inline struct page *
Al Virodd0fc662005-10-07 07:46:04 +0100199alloc_pages(gfp_t gfp_mask, unsigned int order)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200{
201 if (unlikely(order >= MAX_ORDER))
202 return NULL;
203
204 return alloc_pages_current(gfp_mask, order);
205}
Al Virodd0fc662005-10-07 07:46:04 +0100206extern struct page *alloc_page_vma(gfp_t gfp_mask,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 struct vm_area_struct *vma, unsigned long addr);
208#else
209#define alloc_pages(gfp_mask, order) \
210 alloc_pages_node(numa_node_id(), gfp_mask, order)
211#define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
212#endif
213#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
214
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800215extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
216extern unsigned long get_zeroed_page(gfp_t gfp_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218#define __get_free_page(gfp_mask) \
219 __get_free_pages((gfp_mask),0)
220
221#define __get_dma_pages(gfp_mask, order) \
222 __get_free_pages((gfp_mask) | GFP_DMA,(order))
223
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800224extern void __free_pages(struct page *page, unsigned int order);
225extern void free_pages(unsigned long addr, unsigned int order);
226extern void free_hot_page(struct page *page);
227extern void free_cold_page(struct page *page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
229#define __free_page(page) __free_pages((page), 0)
230#define free_page(addr) free_pages((addr),0)
231
232void page_alloc_init(void);
Christoph Lameter4037d452007-05-09 02:35:14 -0700233void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
Christoph Lameter9f8f2172008-02-04 22:29:11 -0800234void drain_all_pages(void);
235void drain_local_pages(void *dummy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237#endif /* __LINUX_GFP_H */