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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 */
43#define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */
44#define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */
45#define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */
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 Lameter523b9452007-10-16 01:25:37 -0700122 int base = 0;
123
124#ifdef CONFIG_NUMA
125 if (flags & __GFP_THISNODE)
126 base = MAX_NR_ZONES;
127#endif
128
Christoph Lameter4b51d662007-02-10 01:43:10 -0800129#ifdef CONFIG_ZONE_DMA
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700130 if (flags & __GFP_DMA)
Christoph Lameter523b9452007-10-16 01:25:37 -0700131 return base + ZONE_DMA;
Christoph Lameter4b51d662007-02-10 01:43:10 -0800132#endif
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700133#ifdef CONFIG_ZONE_DMA32
134 if (flags & __GFP_DMA32)
Christoph Lameter523b9452007-10-16 01:25:37 -0700135 return base + ZONE_DMA32;
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700136#endif
Mel Gorman2a1e2742007-07-17 04:03:12 -0700137 if ((flags & (__GFP_HIGHMEM | __GFP_MOVABLE)) ==
138 (__GFP_HIGHMEM | __GFP_MOVABLE))
Christoph Lameter523b9452007-10-16 01:25:37 -0700139 return base + ZONE_MOVABLE;
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700140#ifdef CONFIG_HIGHMEM
141 if (flags & __GFP_HIGHMEM)
Christoph Lameter523b9452007-10-16 01:25:37 -0700142 return base + ZONE_HIGHMEM;
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700143#endif
Christoph Lameter523b9452007-10-16 01:25:37 -0700144 return base + ZONE_NORMAL;
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700145}
146
Mel Gormane12ba742007-10-16 01:25:52 -0700147static inline gfp_t set_migrateflags(gfp_t gfp, gfp_t migrate_flags)
148{
149 BUG_ON((gfp & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
150 return (gfp & ~(GFP_MOVABLE_MASK)) | migrate_flags;
151}
152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153/*
154 * There is only one page-allocator function, and two main namespaces to
155 * it. The alloc_page*() variants return 'struct page *' and as such
156 * can allocate highmem pages, the *get*page*() variants return
157 * virtual kernel addresses to the allocated page(s).
158 */
159
160/*
161 * We get the zone list from the current node and the gfp_mask.
162 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
163 *
164 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
165 * optimized to &contig_page_data at compile-time.
166 */
167
168#ifndef HAVE_ARCH_FREE_PAGE
169static inline void arch_free_page(struct page *page, int order) { }
170#endif
Nick Piggincc102502006-12-06 20:32:00 -0800171#ifndef HAVE_ARCH_ALLOC_PAGE
172static inline void arch_alloc_page(struct page *page, int order) { }
173#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
175extern struct page *
Al Virodd0fc662005-10-07 07:46:04 +0100176FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Al Virodd0fc662005-10-07 07:46:04 +0100178static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 unsigned int order)
180{
181 if (unlikely(order >= MAX_ORDER))
182 return NULL;
183
Andi Kleen819a6922006-01-11 22:43:45 +0100184 /* Unknown node is current node */
185 if (nid < 0)
186 nid = numa_node_id();
187
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 return __alloc_pages(gfp_mask, order,
Al Viroaf4ca452005-10-21 02:55:38 -0400189 NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
191
192#ifdef CONFIG_NUMA
Al Virodd0fc662005-10-07 07:46:04 +0100193extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
195static inline struct page *
Al Virodd0fc662005-10-07 07:46:04 +0100196alloc_pages(gfp_t gfp_mask, unsigned int order)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
198 if (unlikely(order >= MAX_ORDER))
199 return NULL;
200
201 return alloc_pages_current(gfp_mask, order);
202}
Al Virodd0fc662005-10-07 07:46:04 +0100203extern struct page *alloc_page_vma(gfp_t gfp_mask,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 struct vm_area_struct *vma, unsigned long addr);
205#else
206#define alloc_pages(gfp_mask, order) \
207 alloc_pages_node(numa_node_id(), gfp_mask, order)
208#define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
209#endif
210#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
211
Al Virodd0fc662005-10-07 07:46:04 +0100212extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order));
213extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
215#define __get_free_page(gfp_mask) \
216 __get_free_pages((gfp_mask),0)
217
218#define __get_dma_pages(gfp_mask, order) \
219 __get_free_pages((gfp_mask) | GFP_DMA,(order))
220
221extern void FASTCALL(__free_pages(struct page *page, unsigned int order));
222extern void FASTCALL(free_pages(unsigned long addr, unsigned int order));
223extern void FASTCALL(free_hot_page(struct page *page));
224extern void FASTCALL(free_cold_page(struct page *page));
225
226#define __free_page(page) __free_pages((page), 0)
227#define free_page(addr) free_pages((addr),0)
228
229void page_alloc_init(void);
Christoph Lameter4037d452007-05-09 02:35:14 -0700230void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232#endif /* __LINUX_GFP_H */