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1 | /* SPDX-License-Identifier: GPL-2.0 */ | |
2 | #ifndef __LINUX_GFP_H | |
3 | #define __LINUX_GFP_H | |
4 | ||
5 | #include <linux/mmdebug.h> | |
6 | #include <linux/mmzone.h> | |
7 | #include <linux/stddef.h> | |
8 | #include <linux/linkage.h> | |
9 | #include <linux/topology.h> | |
10 | ||
11 | struct vm_area_struct; | |
12 | ||
13 | /* | |
14 | * In case of changes, please don't forget to update | |
15 | * include/trace/events/mmflags.h and tools/perf/builtin-kmem.c | |
16 | */ | |
17 | ||
18 | /* Plain integer GFP bitmasks. Do not use this directly. */ | |
19 | #define ___GFP_DMA 0x01u | |
20 | #define ___GFP_HIGHMEM 0x02u | |
21 | #define ___GFP_DMA32 0x04u | |
22 | #define ___GFP_MOVABLE 0x08u | |
23 | #define ___GFP_RECLAIMABLE 0x10u | |
24 | #define ___GFP_HIGH 0x20u | |
25 | #define ___GFP_IO 0x40u | |
26 | #define ___GFP_FS 0x80u | |
27 | #define ___GFP_ZERO 0x100u | |
28 | #define ___GFP_ATOMIC 0x200u | |
29 | #define ___GFP_DIRECT_RECLAIM 0x400u | |
30 | #define ___GFP_KSWAPD_RECLAIM 0x800u | |
31 | #define ___GFP_WRITE 0x1000u | |
32 | #define ___GFP_NOWARN 0x2000u | |
33 | #define ___GFP_RETRY_MAYFAIL 0x4000u | |
34 | #define ___GFP_NOFAIL 0x8000u | |
35 | #define ___GFP_NORETRY 0x10000u | |
36 | #define ___GFP_MEMALLOC 0x20000u | |
37 | #define ___GFP_COMP 0x40000u | |
38 | #define ___GFP_NOMEMALLOC 0x80000u | |
39 | #define ___GFP_HARDWALL 0x100000u | |
40 | #define ___GFP_THISNODE 0x200000u | |
41 | #define ___GFP_ACCOUNT 0x400000u | |
42 | #ifdef CONFIG_LOCKDEP | |
43 | #define ___GFP_NOLOCKDEP 0x800000u | |
44 | #else | |
45 | #define ___GFP_NOLOCKDEP 0 | |
46 | #endif | |
47 | /* If the above are modified, __GFP_BITS_SHIFT may need updating */ | |
48 | ||
49 | /* | |
50 | * Physical address zone modifiers (see linux/mmzone.h - low four bits) | |
51 | * | |
52 | * Do not put any conditional on these. If necessary modify the definitions | |
53 | * without the underscores and use them consistently. The definitions here may | |
54 | * be used in bit comparisons. | |
55 | */ | |
56 | #define __GFP_DMA ((__force gfp_t)___GFP_DMA) | |
57 | #define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM) | |
58 | #define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32) | |
59 | #define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* ZONE_MOVABLE allowed */ | |
60 | #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) | |
61 | ||
62 | /** | |
63 | * DOC: Page mobility and placement hints | |
64 | * | |
65 | * Page mobility and placement hints | |
66 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
67 | * | |
68 | * These flags provide hints about how mobile the page is. Pages with similar | |
69 | * mobility are placed within the same pageblocks to minimise problems due | |
70 | * to external fragmentation. | |
71 | * | |
72 | * %__GFP_MOVABLE (also a zone modifier) indicates that the page can be | |
73 | * moved by page migration during memory compaction or can be reclaimed. | |
74 | * | |
75 | * %__GFP_RECLAIMABLE is used for slab allocations that specify | |
76 | * SLAB_RECLAIM_ACCOUNT and whose pages can be freed via shrinkers. | |
77 | * | |
78 | * %__GFP_WRITE indicates the caller intends to dirty the page. Where possible, | |
79 | * these pages will be spread between local zones to avoid all the dirty | |
80 | * pages being in one zone (fair zone allocation policy). | |
81 | * | |
82 | * %__GFP_HARDWALL enforces the cpuset memory allocation policy. | |
83 | * | |
84 | * %__GFP_THISNODE forces the allocation to be satisfied from the requested | |
85 | * node with no fallbacks or placement policy enforcements. | |
86 | * | |
87 | * %__GFP_ACCOUNT causes the allocation to be accounted to kmemcg. | |
88 | */ | |
89 | #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) | |
90 | #define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) | |
91 | #define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) | |
92 | #define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE) | |
93 | #define __GFP_ACCOUNT ((__force gfp_t)___GFP_ACCOUNT) | |
94 | ||
95 | /** | |
96 | * DOC: Watermark modifiers | |
97 | * | |
98 | * Watermark modifiers -- controls access to emergency reserves | |
99 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
100 | * | |
101 | * %__GFP_HIGH indicates that the caller is high-priority and that granting | |
102 | * the request is necessary before the system can make forward progress. | |
103 | * For example, creating an IO context to clean pages. | |
104 | * | |
105 | * %__GFP_ATOMIC indicates that the caller cannot reclaim or sleep and is | |
106 | * high priority. Users are typically interrupt handlers. This may be | |
107 | * used in conjunction with %__GFP_HIGH | |
108 | * | |
109 | * %__GFP_MEMALLOC allows access to all memory. This should only be used when | |
110 | * the caller guarantees the allocation will allow more memory to be freed | |
111 | * very shortly e.g. process exiting or swapping. Users either should | |
112 | * be the MM or co-ordinating closely with the VM (e.g. swap over NFS). | |
113 | * | |
114 | * %__GFP_NOMEMALLOC is used to explicitly forbid access to emergency reserves. | |
115 | * This takes precedence over the %__GFP_MEMALLOC flag if both are set. | |
116 | */ | |
117 | #define __GFP_ATOMIC ((__force gfp_t)___GFP_ATOMIC) | |
118 | #define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) | |
119 | #define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC) | |
120 | #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) | |
121 | ||
122 | /** | |
123 | * DOC: Reclaim modifiers | |
124 | * | |
125 | * Reclaim modifiers | |
126 | * ~~~~~~~~~~~~~~~~~ | |
127 | * | |
128 | * %__GFP_IO can start physical IO. | |
129 | * | |
130 | * %__GFP_FS can call down to the low-level FS. Clearing the flag avoids the | |
131 | * allocator recursing into the filesystem which might already be holding | |
132 | * locks. | |
133 | * | |
134 | * %__GFP_DIRECT_RECLAIM indicates that the caller may enter direct reclaim. | |
135 | * This flag can be cleared to avoid unnecessary delays when a fallback | |
136 | * option is available. | |
137 | * | |
138 | * %__GFP_KSWAPD_RECLAIM indicates that the caller wants to wake kswapd when | |
139 | * the low watermark is reached and have it reclaim pages until the high | |
140 | * watermark is reached. A caller may wish to clear this flag when fallback | |
141 | * options are available and the reclaim is likely to disrupt the system. The | |
142 | * canonical example is THP allocation where a fallback is cheap but | |
143 | * reclaim/compaction may cause indirect stalls. | |
144 | * | |
145 | * %__GFP_RECLAIM is shorthand to allow/forbid both direct and kswapd reclaim. | |
146 | * | |
147 | * The default allocator behavior depends on the request size. We have a concept | |
148 | * of so called costly allocations (with order > %PAGE_ALLOC_COSTLY_ORDER). | |
149 | * !costly allocations are too essential to fail so they are implicitly | |
150 | * non-failing by default (with some exceptions like OOM victims might fail so | |
151 | * the caller still has to check for failures) while costly requests try to be | |
152 | * not disruptive and back off even without invoking the OOM killer. | |
153 | * The following three modifiers might be used to override some of these | |
154 | * implicit rules | |
155 | * | |
156 | * %__GFP_NORETRY: The VM implementation will try only very lightweight | |
157 | * memory direct reclaim to get some memory under memory pressure (thus | |
158 | * it can sleep). It will avoid disruptive actions like OOM killer. The | |
159 | * caller must handle the failure which is quite likely to happen under | |
160 | * heavy memory pressure. The flag is suitable when failure can easily be | |
161 | * handled at small cost, such as reduced throughput | |
162 | * | |
163 | * %__GFP_RETRY_MAYFAIL: The VM implementation will retry memory reclaim | |
164 | * procedures that have previously failed if there is some indication | |
165 | * that progress has been made else where. It can wait for other | |
166 | * tasks to attempt high level approaches to freeing memory such as | |
167 | * compaction (which removes fragmentation) and page-out. | |
168 | * There is still a definite limit to the number of retries, but it is | |
169 | * a larger limit than with %__GFP_NORETRY. | |
170 | * Allocations with this flag may fail, but only when there is | |
171 | * genuinely little unused memory. While these allocations do not | |
172 | * directly trigger the OOM killer, their failure indicates that | |
173 | * the system is likely to need to use the OOM killer soon. The | |
174 | * caller must handle failure, but can reasonably do so by failing | |
175 | * a higher-level request, or completing it only in a much less | |
176 | * efficient manner. | |
177 | * If the allocation does fail, and the caller is in a position to | |
178 | * free some non-essential memory, doing so could benefit the system | |
179 | * as a whole. | |
180 | * | |
181 | * %__GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller | |
182 | * cannot handle allocation failures. The allocation could block | |
183 | * indefinitely but will never return with failure. Testing for | |
184 | * failure is pointless. | |
185 | * New users should be evaluated carefully (and the flag should be | |
186 | * used only when there is no reasonable failure policy) but it is | |
187 | * definitely preferable to use the flag rather than opencode endless | |
188 | * loop around allocator. | |
189 | * Using this flag for costly allocations is _highly_ discouraged. | |
190 | */ | |
191 | #define __GFP_IO ((__force gfp_t)___GFP_IO) | |
192 | #define __GFP_FS ((__force gfp_t)___GFP_FS) | |
193 | #define __GFP_DIRECT_RECLAIM ((__force gfp_t)___GFP_DIRECT_RECLAIM) /* Caller can reclaim */ | |
194 | #define __GFP_KSWAPD_RECLAIM ((__force gfp_t)___GFP_KSWAPD_RECLAIM) /* kswapd can wake */ | |
195 | #define __GFP_RECLAIM ((__force gfp_t)(___GFP_DIRECT_RECLAIM|___GFP_KSWAPD_RECLAIM)) | |
196 | #define __GFP_RETRY_MAYFAIL ((__force gfp_t)___GFP_RETRY_MAYFAIL) | |
197 | #define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) | |
198 | #define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) | |
199 | ||
200 | /** | |
201 | * DOC: Action modifiers | |
202 | * | |
203 | * Action modifiers | |
204 | * ~~~~~~~~~~~~~~~~ | |
205 | * | |
206 | * %__GFP_NOWARN suppresses allocation failure reports. | |
207 | * | |
208 | * %__GFP_COMP address compound page metadata. | |
209 | * | |
210 | * %__GFP_ZERO returns a zeroed page on success. | |
211 | */ | |
212 | #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) | |
213 | #define __GFP_COMP ((__force gfp_t)___GFP_COMP) | |
214 | #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) | |
215 | ||
216 | /* Disable lockdep for GFP context tracking */ | |
217 | #define __GFP_NOLOCKDEP ((__force gfp_t)___GFP_NOLOCKDEP) | |
218 | ||
219 | /* Room for N __GFP_FOO bits */ | |
220 | #define __GFP_BITS_SHIFT (23 + IS_ENABLED(CONFIG_LOCKDEP)) | |
221 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) | |
222 | ||
223 | /** | |
224 | * DOC: Useful GFP flag combinations | |
225 | * | |
226 | * Useful GFP flag combinations | |
227 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
228 | * | |
229 | * Useful GFP flag combinations that are commonly used. It is recommended | |
230 | * that subsystems start with one of these combinations and then set/clear | |
231 | * %__GFP_FOO flags as necessary. | |
232 | * | |
233 | * %GFP_ATOMIC users can not sleep and need the allocation to succeed. A lower | |
234 | * watermark is applied to allow access to "atomic reserves" | |
235 | * | |
236 | * %GFP_KERNEL is typical for kernel-internal allocations. The caller requires | |
237 | * %ZONE_NORMAL or a lower zone for direct access but can direct reclaim. | |
238 | * | |
239 | * %GFP_KERNEL_ACCOUNT is the same as GFP_KERNEL, except the allocation is | |
240 | * accounted to kmemcg. | |
241 | * | |
242 | * %GFP_NOWAIT is for kernel allocations that should not stall for direct | |
243 | * reclaim, start physical IO or use any filesystem callback. | |
244 | * | |
245 | * %GFP_NOIO will use direct reclaim to discard clean pages or slab pages | |
246 | * that do not require the starting of any physical IO. | |
247 | * Please try to avoid using this flag directly and instead use | |
248 | * memalloc_noio_{save,restore} to mark the whole scope which cannot | |
249 | * perform any IO with a short explanation why. All allocation requests | |
250 | * will inherit GFP_NOIO implicitly. | |
251 | * | |
252 | * %GFP_NOFS will use direct reclaim but will not use any filesystem interfaces. | |
253 | * Please try to avoid using this flag directly and instead use | |
254 | * memalloc_nofs_{save,restore} to mark the whole scope which cannot/shouldn't | |
255 | * recurse into the FS layer with a short explanation why. All allocation | |
256 | * requests will inherit GFP_NOFS implicitly. | |
257 | * | |
258 | * %GFP_USER is for userspace allocations that also need to be directly | |
259 | * accessibly by the kernel or hardware. It is typically used by hardware | |
260 | * for buffers that are mapped to userspace (e.g. graphics) that hardware | |
261 | * still must DMA to. cpuset limits are enforced for these allocations. | |
262 | * | |
263 | * %GFP_DMA exists for historical reasons and should be avoided where possible. | |
264 | * The flags indicates that the caller requires that the lowest zone be | |
265 | * used (%ZONE_DMA or 16M on x86-64). Ideally, this would be removed but | |
266 | * it would require careful auditing as some users really require it and | |
267 | * others use the flag to avoid lowmem reserves in %ZONE_DMA and treat the | |
268 | * lowest zone as a type of emergency reserve. | |
269 | * | |
270 | * %GFP_DMA32 is similar to %GFP_DMA except that the caller requires a 32-bit | |
271 | * address. | |
272 | * | |
273 | * %GFP_HIGHUSER is for userspace allocations that may be mapped to userspace, | |
274 | * do not need to be directly accessible by the kernel but that cannot | |
275 | * move once in use. An example may be a hardware allocation that maps | |
276 | * data directly into userspace but has no addressing limitations. | |
277 | * | |
278 | * %GFP_HIGHUSER_MOVABLE is for userspace allocations that the kernel does not | |
279 | * need direct access to but can use kmap() when access is required. They | |
280 | * are expected to be movable via page reclaim or page migration. Typically, | |
281 | * pages on the LRU would also be allocated with %GFP_HIGHUSER_MOVABLE. | |
282 | * | |
283 | * %GFP_TRANSHUGE and %GFP_TRANSHUGE_LIGHT are used for THP allocations. They | |
284 | * are compound allocations that will generally fail quickly if memory is not | |
285 | * available and will not wake kswapd/kcompactd on failure. The _LIGHT | |
286 | * version does not attempt reclaim/compaction at all and is by default used | |
287 | * in page fault path, while the non-light is used by khugepaged. | |
288 | */ | |
289 | #define GFP_ATOMIC (__GFP_HIGH|__GFP_ATOMIC|__GFP_KSWAPD_RECLAIM) | |
290 | #define GFP_KERNEL (__GFP_RECLAIM | __GFP_IO | __GFP_FS) | |
291 | #define GFP_KERNEL_ACCOUNT (GFP_KERNEL | __GFP_ACCOUNT) | |
292 | #define GFP_NOWAIT (__GFP_KSWAPD_RECLAIM) | |
293 | #define GFP_NOIO (__GFP_RECLAIM) | |
294 | #define GFP_NOFS (__GFP_RECLAIM | __GFP_IO) | |
295 | #define GFP_USER (__GFP_RECLAIM | __GFP_IO | __GFP_FS | __GFP_HARDWALL) | |
296 | #define GFP_DMA __GFP_DMA | |
297 | #define GFP_DMA32 __GFP_DMA32 | |
298 | #define GFP_HIGHUSER (GFP_USER | __GFP_HIGHMEM) | |
299 | #define GFP_HIGHUSER_MOVABLE (GFP_HIGHUSER | __GFP_MOVABLE) | |
300 | #define GFP_TRANSHUGE_LIGHT ((GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ | |
301 | __GFP_NOMEMALLOC | __GFP_NOWARN) & ~__GFP_RECLAIM) | |
302 | #define GFP_TRANSHUGE (GFP_TRANSHUGE_LIGHT | __GFP_DIRECT_RECLAIM) | |
303 | ||
304 | /* Convert GFP flags to their corresponding migrate type */ | |
305 | #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) | |
306 | #define GFP_MOVABLE_SHIFT 3 | |
307 | ||
308 | static inline int gfpflags_to_migratetype(const gfp_t gfp_flags) | |
309 | { | |
310 | VM_WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); | |
311 | BUILD_BUG_ON((1UL << GFP_MOVABLE_SHIFT) != ___GFP_MOVABLE); | |
312 | BUILD_BUG_ON((___GFP_MOVABLE >> GFP_MOVABLE_SHIFT) != MIGRATE_MOVABLE); | |
313 | ||
314 | if (unlikely(page_group_by_mobility_disabled)) | |
315 | return MIGRATE_UNMOVABLE; | |
316 | ||
317 | /* Group based on mobility */ | |
318 | return (gfp_flags & GFP_MOVABLE_MASK) >> GFP_MOVABLE_SHIFT; | |
319 | } | |
320 | #undef GFP_MOVABLE_MASK | |
321 | #undef GFP_MOVABLE_SHIFT | |
322 | ||
323 | static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags) | |
324 | { | |
325 | return !!(gfp_flags & __GFP_DIRECT_RECLAIM); | |
326 | } | |
327 | ||
328 | #ifdef CONFIG_HIGHMEM | |
329 | #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM | |
330 | #else | |
331 | #define OPT_ZONE_HIGHMEM ZONE_NORMAL | |
332 | #endif | |
333 | ||
334 | #ifdef CONFIG_ZONE_DMA | |
335 | #define OPT_ZONE_DMA ZONE_DMA | |
336 | #else | |
337 | #define OPT_ZONE_DMA ZONE_NORMAL | |
338 | #endif | |
339 | ||
340 | #ifdef CONFIG_ZONE_DMA32 | |
341 | #define OPT_ZONE_DMA32 ZONE_DMA32 | |
342 | #else | |
343 | #define OPT_ZONE_DMA32 ZONE_NORMAL | |
344 | #endif | |
345 | ||
346 | /* | |
347 | * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the | |
348 | * zone to use given the lowest 4 bits of gfp_t. Entries are GFP_ZONES_SHIFT | |
349 | * bits long and there are 16 of them to cover all possible combinations of | |
350 | * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM. | |
351 | * | |
352 | * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. | |
353 | * But GFP_MOVABLE is not only a zone specifier but also an allocation | |
354 | * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. | |
355 | * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1". | |
356 | * | |
357 | * bit result | |
358 | * ================= | |
359 | * 0x0 => NORMAL | |
360 | * 0x1 => DMA or NORMAL | |
361 | * 0x2 => HIGHMEM or NORMAL | |
362 | * 0x3 => BAD (DMA+HIGHMEM) | |
363 | * 0x4 => DMA32 or NORMAL | |
364 | * 0x5 => BAD (DMA+DMA32) | |
365 | * 0x6 => BAD (HIGHMEM+DMA32) | |
366 | * 0x7 => BAD (HIGHMEM+DMA32+DMA) | |
367 | * 0x8 => NORMAL (MOVABLE+0) | |
368 | * 0x9 => DMA or NORMAL (MOVABLE+DMA) | |
369 | * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) | |
370 | * 0xb => BAD (MOVABLE+HIGHMEM+DMA) | |
371 | * 0xc => DMA32 or NORMAL (MOVABLE+DMA32) | |
372 | * 0xd => BAD (MOVABLE+DMA32+DMA) | |
373 | * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) | |
374 | * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) | |
375 | * | |
376 | * GFP_ZONES_SHIFT must be <= 2 on 32 bit platforms. | |
377 | */ | |
378 | ||
379 | #if defined(CONFIG_ZONE_DEVICE) && (MAX_NR_ZONES-1) <= 4 | |
380 | /* ZONE_DEVICE is not a valid GFP zone specifier */ | |
381 | #define GFP_ZONES_SHIFT 2 | |
382 | #else | |
383 | #define GFP_ZONES_SHIFT ZONES_SHIFT | |
384 | #endif | |
385 | ||
386 | #if 16 * GFP_ZONES_SHIFT > BITS_PER_LONG | |
387 | #error GFP_ZONES_SHIFT too large to create GFP_ZONE_TABLE integer | |
388 | #endif | |
389 | ||
390 | #define GFP_ZONE_TABLE ( \ | |
391 | (ZONE_NORMAL << 0 * GFP_ZONES_SHIFT) \ | |
392 | | (OPT_ZONE_DMA << ___GFP_DMA * GFP_ZONES_SHIFT) \ | |
393 | | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * GFP_ZONES_SHIFT) \ | |
394 | | (OPT_ZONE_DMA32 << ___GFP_DMA32 * GFP_ZONES_SHIFT) \ | |
395 | | (ZONE_NORMAL << ___GFP_MOVABLE * GFP_ZONES_SHIFT) \ | |
396 | | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * GFP_ZONES_SHIFT) \ | |
397 | | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * GFP_ZONES_SHIFT)\ | |
398 | | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * GFP_ZONES_SHIFT)\ | |
399 | ) | |
400 | ||
401 | /* | |
402 | * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32 | |
403 | * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per | |
404 | * entry starting with bit 0. Bit is set if the combination is not | |
405 | * allowed. | |
406 | */ | |
407 | #define GFP_ZONE_BAD ( \ | |
408 | 1 << (___GFP_DMA | ___GFP_HIGHMEM) \ | |
409 | | 1 << (___GFP_DMA | ___GFP_DMA32) \ | |
410 | | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
411 | | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
412 | | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \ | |
413 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \ | |
414 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
415 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \ | |
416 | ) | |
417 | ||
418 | static inline enum zone_type gfp_zone(gfp_t flags) | |
419 | { | |
420 | enum zone_type z; | |
421 | int bit = (__force int) (flags & GFP_ZONEMASK); | |
422 | ||
423 | z = (GFP_ZONE_TABLE >> (bit * GFP_ZONES_SHIFT)) & | |
424 | ((1 << GFP_ZONES_SHIFT) - 1); | |
425 | VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1); | |
426 | return z; | |
427 | } | |
428 | ||
429 | /* | |
430 | * There is only one page-allocator function, and two main namespaces to | |
431 | * it. The alloc_page*() variants return 'struct page *' and as such | |
432 | * can allocate highmem pages, the *get*page*() variants return | |
433 | * virtual kernel addresses to the allocated page(s). | |
434 | */ | |
435 | ||
436 | static inline int gfp_zonelist(gfp_t flags) | |
437 | { | |
438 | #ifdef CONFIG_NUMA | |
439 | if (unlikely(flags & __GFP_THISNODE)) | |
440 | return ZONELIST_NOFALLBACK; | |
441 | #endif | |
442 | return ZONELIST_FALLBACK; | |
443 | } | |
444 | ||
445 | /* | |
446 | * We get the zone list from the current node and the gfp_mask. | |
447 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. | |
448 | * There are two zonelists per node, one for all zones with memory and | |
449 | * one containing just zones from the node the zonelist belongs to. | |
450 | * | |
451 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets | |
452 | * optimized to &contig_page_data at compile-time. | |
453 | */ | |
454 | static inline struct zonelist *node_zonelist(int nid, gfp_t flags) | |
455 | { | |
456 | return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); | |
457 | } | |
458 | ||
459 | #ifndef HAVE_ARCH_FREE_PAGE | |
460 | static inline void arch_free_page(struct page *page, int order) { } | |
461 | #endif | |
462 | #ifndef HAVE_ARCH_ALLOC_PAGE | |
463 | static inline void arch_alloc_page(struct page *page, int order) { } | |
464 | #endif | |
465 | ||
466 | struct page * | |
467 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid, | |
468 | nodemask_t *nodemask); | |
469 | ||
470 | static inline struct page * | |
471 | __alloc_pages(gfp_t gfp_mask, unsigned int order, int preferred_nid) | |
472 | { | |
473 | return __alloc_pages_nodemask(gfp_mask, order, preferred_nid, NULL); | |
474 | } | |
475 | ||
476 | /* | |
477 | * Allocate pages, preferring the node given as nid. The node must be valid and | |
478 | * online. For more general interface, see alloc_pages_node(). | |
479 | */ | |
480 | static inline struct page * | |
481 | __alloc_pages_node(int nid, gfp_t gfp_mask, unsigned int order) | |
482 | { | |
483 | VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); | |
484 | VM_WARN_ON((gfp_mask & __GFP_THISNODE) && !node_online(nid)); | |
485 | ||
486 | return __alloc_pages(gfp_mask, order, nid); | |
487 | } | |
488 | ||
489 | /* | |
490 | * Allocate pages, preferring the node given as nid. When nid == NUMA_NO_NODE, | |
491 | * prefer the current CPU's closest node. Otherwise node must be valid and | |
492 | * online. | |
493 | */ | |
494 | static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, | |
495 | unsigned int order) | |
496 | { | |
497 | if (nid == NUMA_NO_NODE) | |
498 | nid = numa_mem_id(); | |
499 | ||
500 | return __alloc_pages_node(nid, gfp_mask, order); | |
501 | } | |
502 | ||
503 | #ifdef CONFIG_NUMA | |
504 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); | |
505 | ||
506 | static inline struct page * | |
507 | alloc_pages(gfp_t gfp_mask, unsigned int order) | |
508 | { | |
509 | return alloc_pages_current(gfp_mask, order); | |
510 | } | |
511 | extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, | |
512 | struct vm_area_struct *vma, unsigned long addr, | |
513 | int node); | |
514 | #else | |
515 | #define alloc_pages(gfp_mask, order) \ | |
516 | alloc_pages_node(numa_node_id(), gfp_mask, order) | |
517 | #define alloc_pages_vma(gfp_mask, order, vma, addr, node)\ | |
518 | alloc_pages(gfp_mask, order) | |
519 | #endif | |
520 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) | |
521 | #define alloc_page_vma(gfp_mask, vma, addr) \ | |
522 | alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id()) | |
523 | #define alloc_page_vma_node(gfp_mask, vma, addr, node) \ | |
524 | alloc_pages_vma(gfp_mask, 0, vma, addr, node) | |
525 | ||
526 | extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); | |
527 | extern unsigned long get_zeroed_page(gfp_t gfp_mask); | |
528 | ||
529 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask); | |
530 | void free_pages_exact(void *virt, size_t size); | |
531 | void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); | |
532 | ||
533 | #define __get_free_page(gfp_mask) \ | |
534 | __get_free_pages((gfp_mask), 0) | |
535 | ||
536 | #define __get_dma_pages(gfp_mask, order) \ | |
537 | __get_free_pages((gfp_mask) | GFP_DMA, (order)) | |
538 | ||
539 | extern void __free_pages(struct page *page, unsigned int order); | |
540 | extern void free_pages(unsigned long addr, unsigned int order); | |
541 | extern void free_unref_page(struct page *page); | |
542 | extern void free_unref_page_list(struct list_head *list); | |
543 | ||
544 | struct page_frag_cache; | |
545 | extern void __page_frag_cache_drain(struct page *page, unsigned int count); | |
546 | extern void *page_frag_alloc(struct page_frag_cache *nc, | |
547 | unsigned int fragsz, gfp_t gfp_mask); | |
548 | extern void page_frag_free(void *addr); | |
549 | ||
550 | #define __free_page(page) __free_pages((page), 0) | |
551 | #define free_page(addr) free_pages((addr), 0) | |
552 | ||
553 | void page_alloc_init(void); | |
554 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); | |
555 | void drain_all_pages(struct zone *zone); | |
556 | void drain_local_pages(struct zone *zone); | |
557 | ||
558 | void page_alloc_init_late(void); | |
559 | ||
560 | /* | |
561 | * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what | |
562 | * GFP flags are used before interrupts are enabled. Once interrupts are | |
563 | * enabled, it is set to __GFP_BITS_MASK while the system is running. During | |
564 | * hibernation, it is used by PM to avoid I/O during memory allocation while | |
565 | * devices are suspended. | |
566 | */ | |
567 | extern gfp_t gfp_allowed_mask; | |
568 | ||
569 | /* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */ | |
570 | bool gfp_pfmemalloc_allowed(gfp_t gfp_mask); | |
571 | ||
572 | extern void pm_restrict_gfp_mask(void); | |
573 | extern void pm_restore_gfp_mask(void); | |
574 | ||
575 | #ifdef CONFIG_PM_SLEEP | |
576 | extern bool pm_suspended_storage(void); | |
577 | #else | |
578 | static inline bool pm_suspended_storage(void) | |
579 | { | |
580 | return false; | |
581 | } | |
582 | #endif /* CONFIG_PM_SLEEP */ | |
583 | ||
584 | #ifdef CONFIG_CONTIG_ALLOC | |
585 | /* The below functions must be run on a range from a single zone. */ | |
586 | extern int alloc_contig_range(unsigned long start, unsigned long end, | |
587 | unsigned migratetype, gfp_t gfp_mask); | |
588 | #endif | |
589 | void free_contig_range(unsigned long pfn, unsigned int nr_pages); | |
590 | ||
591 | #ifdef CONFIG_CMA | |
592 | /* CMA stuff */ | |
593 | extern void init_cma_reserved_pageblock(struct page *page); | |
594 | #endif | |
595 | ||
596 | #endif /* __LINUX_GFP_H */ |