Line data Source code
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 :
10 : struct 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 the 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.
34 : *
35 : * __GFP_NORETRY: The VM implementation must not retry indefinitely.
36 : *
37 : * __GFP_MOVABLE: Flag that this page will be movable by the page migration
38 : * mechanism or reclaimed
39 : */
40 : #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */
41 : #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */
42 : #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */
43 : #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */
44 : #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */
45 : #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */
46 : #define __GFP_REPEAT ((__force gfp_t)0x400u) /* See above */
47 : #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */
48 : #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */
49 : #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */
50 : #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
51 : #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
52 : #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
53 : #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */
54 : #define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */
55 :
56 : #ifdef CONFIG_KMEMCHECK
57 : #define __GFP_NOTRACK ((__force gfp_t)0x200000u) /* Don't track with kmemcheck */
58 : #else
59 : #define __GFP_NOTRACK ((__force gfp_t)0)
60 : #endif
61 :
62 : /*
63 : * This may seem redundant, but it's a way of annotating false positives vs.
64 : * allocations that simply cannot be supported (e.g. page tables).
65 : */
66 : #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)
67 :
68 : #define __GFP_BITS_SHIFT 22 /* Room for 22 __GFP_FOO bits */
69 : #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
70 :
71 : /* This equals 0, but use constants in case they ever change */
72 : #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
73 : /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
74 : #define GFP_ATOMIC (__GFP_HIGH)
75 : #define GFP_NOIO (__GFP_WAIT)
76 : #define GFP_NOFS (__GFP_WAIT | __GFP_IO)
77 : #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
78 : #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \
79 : __GFP_RECLAIMABLE)
80 : #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
81 : #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
82 : __GFP_HIGHMEM)
83 : #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
84 : __GFP_HARDWALL | __GFP_HIGHMEM | \
85 : __GFP_MOVABLE)
86 :
87 : #ifdef CONFIG_NUMA
88 : #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
89 : #else
90 : #define GFP_THISNODE ((__force gfp_t)0)
91 : #endif
92 :
93 : /* This mask makes up all the page movable related flags */
94 : #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
95 :
96 : /* Control page allocator reclaim behavior */
97 : #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
98 : __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
99 : __GFP_NORETRY|__GFP_NOMEMALLOC)
100 :
101 : /* Control slab gfp mask during early boot */
102 : #define GFP_BOOT_MASK __GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)
103 :
104 : /* Control allocation constraints */
105 : #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
106 :
107 : /* Do not use these with a slab allocator */
108 : #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
109 :
110 : /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
111 : platforms, used as appropriate on others */
112 :
113 : #define GFP_DMA __GFP_DMA
114 :
115 : /* 4GB DMA on some platforms */
116 : #define GFP_DMA32 __GFP_DMA32
117 :
118 : /* Convert GFP flags to their corresponding migrate type */
119 : static inline int allocflags_to_migratetype(gfp_t gfp_flags)
120 : {
121 : WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
122 :
123 : if (unlikely(page_group_by_mobility_disabled))
124 : return MIGRATE_UNMOVABLE;
125 :
126 : /* Group based on mobility */
127 : return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) |
128 : ((gfp_flags & __GFP_RECLAIMABLE) != 0);
129 : }
130 :
131 : #ifdef CONFIG_HIGHMEM
132 : #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM
133 : #else
134 : #define OPT_ZONE_HIGHMEM ZONE_NORMAL
135 : #endif
136 :
137 : #ifdef CONFIG_ZONE_DMA
138 : #define OPT_ZONE_DMA ZONE_DMA
139 : #else
140 : #define OPT_ZONE_DMA ZONE_NORMAL
141 : #endif
142 :
143 : #ifdef CONFIG_ZONE_DMA32
144 : #define OPT_ZONE_DMA32 ZONE_DMA32
145 : #else
146 : #define OPT_ZONE_DMA32 ZONE_NORMAL
147 : #endif
148 :
149 : /*
150 : * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the
151 : * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long
152 : * and there are 16 of them to cover all possible combinations of
153 : * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM
154 : *
155 : * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA.
156 : * But GFP_MOVABLE is not only a zone specifier but also an allocation
157 : * policy. Therefore __GFP_MOVABLE plus another zone selector is valid.
158 : * Only 1bit of the lowest 3 bit (DMA,DMA32,HIGHMEM) can be set to "1".
159 : *
160 : * bit result
161 : * =================
162 : * 0x0 => NORMAL
163 : * 0x1 => DMA or NORMAL
164 : * 0x2 => HIGHMEM or NORMAL
165 : * 0x3 => BAD (DMA+HIGHMEM)
166 : * 0x4 => DMA32 or DMA or NORMAL
167 : * 0x5 => BAD (DMA+DMA32)
168 : * 0x6 => BAD (HIGHMEM+DMA32)
169 : * 0x7 => BAD (HIGHMEM+DMA32+DMA)
170 : * 0x8 => NORMAL (MOVABLE+0)
171 : * 0x9 => DMA or NORMAL (MOVABLE+DMA)
172 : * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too)
173 : * 0xb => BAD (MOVABLE+HIGHMEM+DMA)
174 : * 0xc => DMA32 (MOVABLE+HIGHMEM+DMA32)
175 : * 0xd => BAD (MOVABLE+DMA32+DMA)
176 : * 0xe => BAD (MOVABLE+DMA32+HIGHMEM)
177 : * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA)
178 : *
179 : * ZONES_SHIFT must be <= 2 on 32 bit platforms.
180 : */
181 :
182 : #if 16 * ZONES_SHIFT > BITS_PER_LONG
183 : #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer
184 : #endif
185 :
186 : #define GFP_ZONE_TABLE ( \
187 : (ZONE_NORMAL << 0 * ZONES_SHIFT) \
188 : | (OPT_ZONE_DMA << __GFP_DMA * ZONES_SHIFT) \
189 : | (OPT_ZONE_HIGHMEM << __GFP_HIGHMEM * ZONES_SHIFT) \
190 : | (OPT_ZONE_DMA32 << __GFP_DMA32 * ZONES_SHIFT) \
191 : | (ZONE_NORMAL << __GFP_MOVABLE * ZONES_SHIFT) \
192 : | (OPT_ZONE_DMA << (__GFP_MOVABLE | __GFP_DMA) * ZONES_SHIFT) \
193 : | (ZONE_MOVABLE << (__GFP_MOVABLE | __GFP_HIGHMEM) * ZONES_SHIFT)\
194 : | (OPT_ZONE_DMA32 << (__GFP_MOVABLE | __GFP_DMA32) * ZONES_SHIFT)\
195 : )
196 :
197 : /*
198 : * GFP_ZONE_BAD is a bitmap for all combination of __GFP_DMA, __GFP_DMA32
199 : * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per
200 : * entry starting with bit 0. Bit is set if the combination is not
201 : * allowed.
202 : */
203 : #define GFP_ZONE_BAD ( \
204 : 1 << (__GFP_DMA | __GFP_HIGHMEM) \
205 : | 1 << (__GFP_DMA | __GFP_DMA32) \
206 : | 1 << (__GFP_DMA32 | __GFP_HIGHMEM) \
207 : | 1 << (__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM) \
208 : | 1 << (__GFP_MOVABLE | __GFP_HIGHMEM | __GFP_DMA) \
209 : | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_DMA) \
210 : | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_HIGHMEM) \
211 : | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_DMA | __GFP_HIGHMEM)\
212 : )
213 :
214 : static inline enum zone_type gfp_zone(gfp_t flags)
215 : {
216 : enum zone_type z;
217 : int bit = flags & GFP_ZONEMASK;
218 :
219 : z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) &
220 : ((1 << ZONES_SHIFT) - 1);
221 :
222 : if (__builtin_constant_p(bit))
223 : MAYBE_BUILD_BUG_ON((GFP_ZONE_BAD >> bit) & 1);
224 : else {
225 : #ifdef CONFIG_DEBUG_VM
226 : BUG_ON((GFP_ZONE_BAD >> bit) & 1);
227 : #endif
228 : }
229 : return z;
230 : }
231 :
232 : /*
233 : * There is only one page-allocator function, and two main namespaces to
234 : * it. The alloc_page*() variants return 'struct page *' and as such
235 : * can allocate highmem pages, the *get*page*() variants return
236 : * virtual kernel addresses to the allocated page(s).
237 : */
238 :
239 : static inline int gfp_zonelist(gfp_t flags)
240 : {
241 : if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE))
242 : return 1;
243 :
244 : return 0;
245 : }
246 :
247 : /*
248 : * We get the zone list from the current node and the gfp_mask.
249 : * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
250 : * There are two zonelists per node, one for all zones with memory and
251 : * one containing just zones from the node the zonelist belongs to.
252 : *
253 : * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
254 : * optimized to &contig_page_data at compile-time.
255 : */
256 : static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
257 : {
258 : return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
259 : }
260 :
261 : #ifndef HAVE_ARCH_FREE_PAGE
262 : static inline void arch_free_page(struct page *page, int order) { }
263 : #endif
264 : #ifndef HAVE_ARCH_ALLOC_PAGE
265 : static inline void arch_alloc_page(struct page *page, int order) { }
266 : #endif
267 :
268 : struct page *
269 : __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
270 : struct zonelist *zonelist, nodemask_t *nodemask);
271 :
272 : static inline struct page *
273 : __alloc_pages(gfp_t gfp_mask, unsigned int order,
274 : struct zonelist *zonelist)
275 : {
276 : return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL);
277 : }
278 :
279 : static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
280 : unsigned int order)
281 : {
282 : /* Unknown node is current node */
283 : if (nid < 0)
284 : nid = numa_node_id();
285 :
286 : return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
287 : }
288 :
289 : static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask,
290 : unsigned int order)
291 : {
292 : VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES);
293 :
294 : return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
295 : }
296 :
297 : #ifdef CONFIG_NUMA
298 : extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
299 :
300 : static inline struct page *
301 : alloc_pages(gfp_t gfp_mask, unsigned int order)
302 : {
303 33 : return alloc_pages_current(gfp_mask, order);
304 : }
305 : extern struct page *alloc_page_vma(gfp_t gfp_mask,
306 : struct vm_area_struct *vma, unsigned long addr);
307 : #else
308 : #define alloc_pages(gfp_mask, order) \
309 : alloc_pages_node(numa_node_id(), gfp_mask, order)
310 : #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
311 : #endif
312 : #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
313 :
314 : extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
315 : extern unsigned long get_zeroed_page(gfp_t gfp_mask);
316 :
317 : void *alloc_pages_exact(size_t size, gfp_t gfp_mask);
318 : void free_pages_exact(void *virt, size_t size);
319 :
320 : #define __get_free_page(gfp_mask) \
321 : __get_free_pages((gfp_mask),0)
322 :
323 : #define __get_dma_pages(gfp_mask, order) \
324 : __get_free_pages((gfp_mask) | GFP_DMA,(order))
325 :
326 : extern void __free_pages(struct page *page, unsigned int order);
327 : extern void free_pages(unsigned long addr, unsigned int order);
328 : extern void free_hot_page(struct page *page);
329 :
330 : #define __free_page(page) __free_pages((page), 0)
331 : #define free_page(addr) free_pages((addr),0)
332 :
333 : void page_alloc_init(void);
334 : void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
335 : void drain_all_pages(void);
336 : void drain_local_pages(void *dummy);
337 :
338 : extern gfp_t gfp_allowed_mask;
339 :
340 : static inline void set_gfp_allowed_mask(gfp_t mask)
341 : {
342 : gfp_allowed_mask = mask;
343 : }
344 :
345 : #endif /* __LINUX_GFP_H */
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