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
8 struct vm_area_struct;
9
10 /*
11 * GFP bitmasks..
12 *
13 * Zone modifiers (see linux/mmzone.h - low three bits)
14 *
15 * 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.
18 */
19 #define __GFP_DMA ((__force gfp_t)0x01u)
20 #define __GFP_HIGHMEM ((__force gfp_t)0x02u)
21 #define __GFP_DMA32 ((__force gfp_t)0x04u)
22
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.
33 *
34 * __GFP_MOVABLE: Flag that this page will be movable by the page migration
35 * mechanism or reclaimed
36 */
37 #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) /* See above */
44 #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */
45 #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */
46 #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 */
49 #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
50 #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */
51 #define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */
52 #define __GFP_MOVABLE ((__force gfp_t)0x100000u) /* Page is movable */
53
54 #define __GFP_BITS_SHIFT 21 /* Room for 21 __GFP_FOO bits */
55 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
56
57 /* This equals 0, but use constants in case they ever change */
58 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
59 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
60 #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)
64 #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \
65 __GFP_RECLAIMABLE)
66 #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)
69 #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
70 __GFP_HARDWALL | __GFP_HIGHMEM | \
71 __GFP_MOVABLE)
72
73 #ifdef CONFIG_NUMA
74 #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
75 #else
76 #define GFP_THISNODE ((__force gfp_t)0)
77 #endif
78
79 /* This mask makes up all the page movable related flags */
80 #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
81
82 /* Control page allocator reclaim behavior */
83 #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
84 __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
85 __GFP_NORETRY|__GFP_NOMEMALLOC)
86
87 /* Control allocation constraints */
88 #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
89
90 /* Do not use these with a slab allocator */
91 #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
92
93 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
94 platforms, used as appropriate on others */
95
96 #define GFP_DMA __GFP_DMA
97
98 /* 4GB DMA on some platforms */
99 #define GFP_DMA32 __GFP_DMA32
100
101 /* Convert GFP flags to their corresponding migrate type */
allocflags_to_migratetype(gfp_t gfp_flags)102 static inline int allocflags_to_migratetype(gfp_t gfp_flags)
103 {
104 WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
105
106 if (unlikely(page_group_by_mobility_disabled))
107 return MIGRATE_UNMOVABLE;
108
109 /* Group based on mobility */
110 return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) |
111 ((gfp_flags & __GFP_RECLAIMABLE) != 0);
112 }
113
gfp_zone(gfp_t flags)114 static inline enum zone_type gfp_zone(gfp_t flags)
115 {
116 #ifdef CONFIG_ZONE_DMA
117 if (flags & __GFP_DMA)
118 return ZONE_DMA;
119 #endif
120 #ifdef CONFIG_ZONE_DMA32
121 if (flags & __GFP_DMA32)
122 return ZONE_DMA32;
123 #endif
124 if ((flags & (__GFP_HIGHMEM | __GFP_MOVABLE)) ==
125 (__GFP_HIGHMEM | __GFP_MOVABLE))
126 return ZONE_MOVABLE;
127 #ifdef CONFIG_HIGHMEM
128 if (flags & __GFP_HIGHMEM)
129 return ZONE_HIGHMEM;
130 #endif
131 return ZONE_NORMAL;
132 }
133
134 /*
135 * There is only one page-allocator function, and two main namespaces to
136 * it. The alloc_page*() variants return 'struct page *' and as such
137 * can allocate highmem pages, the *get*page*() variants return
138 * virtual kernel addresses to the allocated page(s).
139 */
140
gfp_zonelist(gfp_t flags)141 static inline int gfp_zonelist(gfp_t flags)
142 {
143 if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE))
144 return 1;
145
146 return 0;
147 }
148
149 /*
150 * We get the zone list from the current node and the gfp_mask.
151 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
152 * There are two zonelists per node, one for all zones with memory and
153 * one containing just zones from the node the zonelist belongs to.
154 *
155 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
156 * optimized to &contig_page_data at compile-time.
157 */
node_zonelist(int nid,gfp_t flags)158 static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
159 {
160 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
161 }
162
163 #ifndef HAVE_ARCH_FREE_PAGE
arch_free_page(struct page * page,int order)164 static inline void arch_free_page(struct page *page, int order) { }
165 #endif
166 #ifndef HAVE_ARCH_ALLOC_PAGE
arch_alloc_page(struct page * page,int order)167 static inline void arch_alloc_page(struct page *page, int order) { }
168 #endif
169
170 struct page *
171 __alloc_pages_internal(gfp_t gfp_mask, unsigned int order,
172 struct zonelist *zonelist, nodemask_t *nodemask);
173
174 static inline struct page *
__alloc_pages(gfp_t gfp_mask,unsigned int order,struct zonelist * zonelist)175 __alloc_pages(gfp_t gfp_mask, unsigned int order,
176 struct zonelist *zonelist)
177 {
178 return __alloc_pages_internal(gfp_mask, order, zonelist, NULL);
179 }
180
181 static inline struct page *
__alloc_pages_nodemask(gfp_t gfp_mask,unsigned int order,struct zonelist * zonelist,nodemask_t * nodemask)182 __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
183 struct zonelist *zonelist, nodemask_t *nodemask)
184 {
185 return __alloc_pages_internal(gfp_mask, order, zonelist, nodemask);
186 }
187
188
alloc_pages_node(int nid,gfp_t gfp_mask,unsigned int order)189 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
190 unsigned int order)
191 {
192 if (unlikely(order >= MAX_ORDER))
193 return NULL;
194
195 /* Unknown node is current node */
196 if (nid < 0)
197 nid = numa_node_id();
198
199 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
200 }
201
202 #ifdef CONFIG_NUMA
203 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
204
205 static inline struct page *
alloc_pages(gfp_t gfp_mask,unsigned int order)206 alloc_pages(gfp_t gfp_mask, unsigned int order)
207 {
208 if (unlikely(order >= MAX_ORDER))
209 return NULL;
210
211 return alloc_pages_current(gfp_mask, order);
212 }
213 extern struct page *alloc_page_vma(gfp_t gfp_mask,
214 struct vm_area_struct *vma, unsigned long addr);
215 #else
216 #define alloc_pages(gfp_mask, order) \
217 alloc_pages_node(numa_node_id(), gfp_mask, order)
218 #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
219 #endif
220 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
221
222 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
223 extern unsigned long get_zeroed_page(gfp_t gfp_mask);
224
225 void *alloc_pages_exact(size_t size, gfp_t gfp_mask);
226 void free_pages_exact(void *virt, size_t size);
227
228 #define __get_free_page(gfp_mask) \
229 __get_free_pages((gfp_mask),0)
230
231 #define __get_dma_pages(gfp_mask, order) \
232 __get_free_pages((gfp_mask) | GFP_DMA,(order))
233
234 extern void __free_pages(struct page *page, unsigned int order);
235 extern void free_pages(unsigned long addr, unsigned int order);
236 extern void free_hot_page(struct page *page);
237 extern void free_cold_page(struct page *page);
238
239 #define __free_page(page) __free_pages((page), 0)
240 #define free_page(addr) free_pages((addr),0)
241
242 void page_alloc_init(void);
243 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
244 void drain_all_pages(void);
245 void drain_local_pages(void *dummy);
246
247 #endif /* __LINUX_GFP_H */
248