1 #ifndef _LINUX_MEMBLOCK_H
2 #define _LINUX_MEMBLOCK_H
3 #ifdef __KERNEL__
4
5 #ifdef CONFIG_HAVE_MEMBLOCK
6 /*
7 * Logical memory blocks.
8 *
9 * Copyright (C) 2001 Peter Bergner, IBM Corp.
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17 #include <linux/init.h>
18 #include <linux/mm.h>
19
20 #define INIT_MEMBLOCK_REGIONS 128
21 #define INIT_PHYSMEM_REGIONS 4
22
23 /* Definition of memblock flags. */
24 enum {
25 MEMBLOCK_NONE = 0x0, /* No special request */
26 MEMBLOCK_HOTPLUG = 0x1, /* hotpluggable region */
27 MEMBLOCK_MIRROR = 0x2, /* mirrored region */
28 MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */
29 };
30
31 struct memblock_region {
32 phys_addr_t base;
33 phys_addr_t size;
34 unsigned long flags;
35 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
36 int nid;
37 #endif
38 };
39
40 struct memblock_type {
41 unsigned long cnt; /* number of regions */
42 unsigned long max; /* size of the allocated array */
43 phys_addr_t total_size; /* size of all regions */
44 struct memblock_region *regions;
45 };
46
47 struct memblock {
48 bool bottom_up; /* is bottom up direction? */
49 phys_addr_t current_limit;
50 struct memblock_type memory;
51 struct memblock_type reserved;
52 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
53 struct memblock_type physmem;
54 #endif
55 };
56
57 extern struct memblock memblock;
58 extern int memblock_debug;
59 #ifdef CONFIG_MOVABLE_NODE
60 /* If movable_node boot option specified */
61 extern bool movable_node_enabled;
62 #endif /* CONFIG_MOVABLE_NODE */
63
64 #define memblock_dbg(fmt, ...) \
65 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
66
67 phys_addr_t memblock_find_in_range_node(phys_addr_t size, phys_addr_t align,
68 phys_addr_t start, phys_addr_t end,
69 int nid, ulong flags);
70 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
71 phys_addr_t size, phys_addr_t align);
72 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr);
73 phys_addr_t get_allocated_memblock_memory_regions_info(phys_addr_t *addr);
74 void memblock_allow_resize(void);
75 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid);
76 int memblock_add(phys_addr_t base, phys_addr_t size);
77 int memblock_remove(phys_addr_t base, phys_addr_t size);
78 int memblock_free(phys_addr_t base, phys_addr_t size);
79 int memblock_reserve(phys_addr_t base, phys_addr_t size);
80 void memblock_trim_memory(phys_addr_t align);
81 bool memblock_overlaps_region(struct memblock_type *type,
82 phys_addr_t base, phys_addr_t size);
83 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
84 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
85 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
86 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size);
87 ulong choose_memblock_flags(void);
88
89 /* Low level functions */
90 int memblock_add_range(struct memblock_type *type,
91 phys_addr_t base, phys_addr_t size,
92 int nid, unsigned long flags);
93
94 void __next_mem_range(u64 *idx, int nid, ulong flags,
95 struct memblock_type *type_a,
96 struct memblock_type *type_b, phys_addr_t *out_start,
97 phys_addr_t *out_end, int *out_nid);
98
99 void __next_mem_range_rev(u64 *idx, int nid, ulong flags,
100 struct memblock_type *type_a,
101 struct memblock_type *type_b, phys_addr_t *out_start,
102 phys_addr_t *out_end, int *out_nid);
103
104 void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start,
105 phys_addr_t *out_end);
106
107 /**
108 * for_each_mem_range - iterate through memblock areas from type_a and not
109 * included in type_b. Or just type_a if type_b is NULL.
110 * @i: u64 used as loop variable
111 * @type_a: ptr to memblock_type to iterate
112 * @type_b: ptr to memblock_type which excludes from the iteration
113 * @nid: node selector, %NUMA_NO_NODE for all nodes
114 * @flags: pick from blocks based on memory attributes
115 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
116 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
117 * @p_nid: ptr to int for nid of the range, can be %NULL
118 */
119 #define for_each_mem_range(i, type_a, type_b, nid, flags, \
120 p_start, p_end, p_nid) \
121 for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b, \
122 p_start, p_end, p_nid); \
123 i != (u64)ULLONG_MAX; \
124 __next_mem_range(&i, nid, flags, type_a, type_b, \
125 p_start, p_end, p_nid))
126
127 /**
128 * for_each_mem_range_rev - reverse iterate through memblock areas from
129 * type_a and not included in type_b. Or just type_a if type_b is NULL.
130 * @i: u64 used as loop variable
131 * @type_a: ptr to memblock_type to iterate
132 * @type_b: ptr to memblock_type which excludes from the iteration
133 * @nid: node selector, %NUMA_NO_NODE for all nodes
134 * @flags: pick from blocks based on memory attributes
135 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
136 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
137 * @p_nid: ptr to int for nid of the range, can be %NULL
138 */
139 #define for_each_mem_range_rev(i, type_a, type_b, nid, flags, \
140 p_start, p_end, p_nid) \
141 for (i = (u64)ULLONG_MAX, \
142 __next_mem_range_rev(&i, nid, flags, type_a, type_b,\
143 p_start, p_end, p_nid); \
144 i != (u64)ULLONG_MAX; \
145 __next_mem_range_rev(&i, nid, flags, type_a, type_b, \
146 p_start, p_end, p_nid))
147
148 /**
149 * for_each_reserved_mem_region - iterate over all reserved memblock areas
150 * @i: u64 used as loop variable
151 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
152 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
153 *
154 * Walks over reserved areas of memblock. Available as soon as memblock
155 * is initialized.
156 */
157 #define for_each_reserved_mem_region(i, p_start, p_end) \
158 for (i = 0UL, \
159 __next_reserved_mem_region(&i, p_start, p_end); \
160 i != (u64)ULLONG_MAX; \
161 __next_reserved_mem_region(&i, p_start, p_end))
162
163 #ifdef CONFIG_MOVABLE_NODE
memblock_is_hotpluggable(struct memblock_region * m)164 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
165 {
166 return m->flags & MEMBLOCK_HOTPLUG;
167 }
168
movable_node_is_enabled(void)169 static inline bool movable_node_is_enabled(void)
170 {
171 return movable_node_enabled;
172 }
173 #else
memblock_is_hotpluggable(struct memblock_region * m)174 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
175 {
176 return false;
177 }
movable_node_is_enabled(void)178 static inline bool movable_node_is_enabled(void)
179 {
180 return false;
181 }
182 #endif
183
memblock_is_mirror(struct memblock_region * m)184 static inline bool memblock_is_mirror(struct memblock_region *m)
185 {
186 return m->flags & MEMBLOCK_MIRROR;
187 }
188
memblock_is_nomap(struct memblock_region * m)189 static inline bool memblock_is_nomap(struct memblock_region *m)
190 {
191 return m->flags & MEMBLOCK_NOMAP;
192 }
193
194 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
195 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
196 unsigned long *end_pfn);
197 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
198 unsigned long *out_end_pfn, int *out_nid);
199
200 /**
201 * for_each_mem_pfn_range - early memory pfn range iterator
202 * @i: an integer used as loop variable
203 * @nid: node selector, %MAX_NUMNODES for all nodes
204 * @p_start: ptr to ulong for start pfn of the range, can be %NULL
205 * @p_end: ptr to ulong for end pfn of the range, can be %NULL
206 * @p_nid: ptr to int for nid of the range, can be %NULL
207 *
208 * Walks over configured memory ranges.
209 */
210 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \
211 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
212 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
213 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
214
215 /**
216 * for_each_free_mem_range - iterate through free memblock areas
217 * @i: u64 used as loop variable
218 * @nid: node selector, %NUMA_NO_NODE for all nodes
219 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
220 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
221 * @p_nid: ptr to int for nid of the range, can be %NULL
222 * @flags: pick from blocks based on memory attributes
223 *
224 * Walks over free (memory && !reserved) areas of memblock. Available as
225 * soon as memblock is initialized.
226 */
227 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \
228 for_each_mem_range(i, &memblock.memory, &memblock.reserved, \
229 nid, flags, p_start, p_end, p_nid)
230
231 /**
232 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
233 * @i: u64 used as loop variable
234 * @nid: node selector, %NUMA_NO_NODE for all nodes
235 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
236 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
237 * @p_nid: ptr to int for nid of the range, can be %NULL
238 * @flags: pick from blocks based on memory attributes
239 *
240 * Walks over free (memory && !reserved) areas of memblock in reverse
241 * order. Available as soon as memblock is initialized.
242 */
243 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end, \
244 p_nid) \
245 for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
246 nid, flags, p_start, p_end, p_nid)
247
memblock_set_region_flags(struct memblock_region * r,unsigned long flags)248 static inline void memblock_set_region_flags(struct memblock_region *r,
249 unsigned long flags)
250 {
251 r->flags |= flags;
252 }
253
memblock_clear_region_flags(struct memblock_region * r,unsigned long flags)254 static inline void memblock_clear_region_flags(struct memblock_region *r,
255 unsigned long flags)
256 {
257 r->flags &= ~flags;
258 }
259
260 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
261 int memblock_set_node(phys_addr_t base, phys_addr_t size,
262 struct memblock_type *type, int nid);
263
memblock_set_region_node(struct memblock_region * r,int nid)264 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
265 {
266 r->nid = nid;
267 }
268
memblock_get_region_node(const struct memblock_region * r)269 static inline int memblock_get_region_node(const struct memblock_region *r)
270 {
271 return r->nid;
272 }
273 #else
memblock_set_region_node(struct memblock_region * r,int nid)274 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
275 {
276 }
277
memblock_get_region_node(const struct memblock_region * r)278 static inline int memblock_get_region_node(const struct memblock_region *r)
279 {
280 return 0;
281 }
282 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
283
284 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
285 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
286
287 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
288
289 #ifdef CONFIG_MOVABLE_NODE
290 /*
291 * Set the allocation direction to bottom-up or top-down.
292 */
memblock_set_bottom_up(bool enable)293 static inline void __init memblock_set_bottom_up(bool enable)
294 {
295 memblock.bottom_up = enable;
296 }
297
298 /*
299 * Check if the allocation direction is bottom-up or not.
300 * if this is true, that said, memblock will allocate memory
301 * in bottom-up direction.
302 */
memblock_bottom_up(void)303 static inline bool memblock_bottom_up(void)
304 {
305 return memblock.bottom_up;
306 }
307 #else
memblock_set_bottom_up(bool enable)308 static inline void __init memblock_set_bottom_up(bool enable) {}
memblock_bottom_up(void)309 static inline bool memblock_bottom_up(void) { return false; }
310 #endif
311
312 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
313 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
314 #define MEMBLOCK_ALLOC_ACCESSIBLE 0
315
316 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align,
317 phys_addr_t start, phys_addr_t end,
318 ulong flags);
319 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
320 phys_addr_t max_addr);
321 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
322 phys_addr_t max_addr);
323 phys_addr_t memblock_phys_mem_size(void);
324 phys_addr_t memblock_mem_size(unsigned long limit_pfn);
325 phys_addr_t memblock_start_of_DRAM(void);
326 phys_addr_t memblock_end_of_DRAM(void);
327 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
328 int memblock_is_memory(phys_addr_t addr);
329 int memblock_is_map_memory(phys_addr_t addr);
330 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
331 int memblock_is_reserved(phys_addr_t addr);
332 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
333
334 extern void __memblock_dump_all(void);
335
memblock_dump_all(void)336 static inline void memblock_dump_all(void)
337 {
338 if (memblock_debug)
339 __memblock_dump_all();
340 }
341
342 /**
343 * memblock_set_current_limit - Set the current allocation limit to allow
344 * limiting allocations to what is currently
345 * accessible during boot
346 * @limit: New limit value (physical address)
347 */
348 void memblock_set_current_limit(phys_addr_t limit);
349
350
351 phys_addr_t memblock_get_current_limit(void);
352
353 /*
354 * pfn conversion functions
355 *
356 * While the memory MEMBLOCKs should always be page aligned, the reserved
357 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
358 * idea of what they return for such non aligned MEMBLOCKs.
359 */
360
361 /**
362 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
363 * @reg: memblock_region structure
364 */
memblock_region_memory_base_pfn(const struct memblock_region * reg)365 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
366 {
367 return PFN_UP(reg->base);
368 }
369
370 /**
371 * memblock_region_memory_end_pfn - Return the end_pfn this region
372 * @reg: memblock_region structure
373 */
memblock_region_memory_end_pfn(const struct memblock_region * reg)374 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
375 {
376 return PFN_DOWN(reg->base + reg->size);
377 }
378
379 /**
380 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
381 * @reg: memblock_region structure
382 */
memblock_region_reserved_base_pfn(const struct memblock_region * reg)383 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
384 {
385 return PFN_DOWN(reg->base);
386 }
387
388 /**
389 * memblock_region_reserved_end_pfn - Return the end_pfn this region
390 * @reg: memblock_region structure
391 */
memblock_region_reserved_end_pfn(const struct memblock_region * reg)392 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
393 {
394 return PFN_UP(reg->base + reg->size);
395 }
396
397 #define for_each_memblock(memblock_type, region) \
398 for (region = memblock.memblock_type.regions; \
399 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
400 region++)
401
402
403 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
404 #define __init_memblock __meminit
405 #define __initdata_memblock __meminitdata
406 #else
407 #define __init_memblock
408 #define __initdata_memblock
409 #endif
410
411 #ifdef CONFIG_MEMTEST
412 extern void early_memtest(phys_addr_t start, phys_addr_t end);
413 #else
early_memtest(phys_addr_t start,phys_addr_t end)414 static inline void early_memtest(phys_addr_t start, phys_addr_t end)
415 {
416 }
417 #endif
418
419 extern unsigned long memblock_reserved_memory_within(phys_addr_t start_addr,
420 phys_addr_t end_addr);
421 #else
memblock_alloc(phys_addr_t size,phys_addr_t align)422 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
423 {
424 return 0;
425 }
426
memblock_reserved_memory_within(phys_addr_t start_addr,phys_addr_t end_addr)427 static inline unsigned long memblock_reserved_memory_within(phys_addr_t start_addr,
428 phys_addr_t end_addr)
429 {
430 return 0;
431 }
432
433 #endif /* CONFIG_HAVE_MEMBLOCK */
434
435 #endif /* __KERNEL__ */
436
437 #endif /* _LINUX_MEMBLOCK_H */
438