1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef _LINUX_MEMBLOCK_H
3 #define _LINUX_MEMBLOCK_H
4 
5 /*
6  * Logical memory blocks.
7  *
8  * Copyright (C) 2001 Peter Bergner, IBM Corp.
9  */
10 
11 #include <linux/init.h>
12 #include <linux/mm.h>
13 #include <asm/dma.h>
14 
15 extern unsigned long max_low_pfn;
16 extern unsigned long min_low_pfn;
17 
18 /*
19  * highest page
20  */
21 extern unsigned long max_pfn;
22 /*
23  * highest possible page
24  */
25 extern unsigned long long max_possible_pfn;
26 
27 /**
28  * enum memblock_flags - definition of memory region attributes
29  * @MEMBLOCK_NONE: no special request
30  * @MEMBLOCK_HOTPLUG: memory region indicated in the firmware-provided memory
31  * map during early boot as hot(un)pluggable system RAM (e.g., memory range
32  * that might get hotunplugged later). With "movable_node" set on the kernel
33  * commandline, try keeping this memory region hotunpluggable. Does not apply
34  * to memblocks added ("hotplugged") after early boot.
35  * @MEMBLOCK_MIRROR: mirrored region
36  * @MEMBLOCK_NOMAP: don't add to kernel direct mapping and treat as
37  * reserved in the memory map; refer to memblock_mark_nomap() description
38  * for further details
39  * @MEMBLOCK_DRIVER_MANAGED: memory region that is always detected and added
40  * via a driver, and never indicated in the firmware-provided memory map as
41  * system RAM. This corresponds to IORESOURCE_SYSRAM_DRIVER_MANAGED in the
42  * kernel resource tree.
43  */
44 enum memblock_flags {
45 	MEMBLOCK_NONE		= 0x0,	/* No special request */
46 	MEMBLOCK_HOTPLUG	= 0x1,	/* hotpluggable region */
47 	MEMBLOCK_MIRROR		= 0x2,	/* mirrored region */
48 	MEMBLOCK_NOMAP		= 0x4,	/* don't add to kernel direct mapping */
49 	MEMBLOCK_DRIVER_MANAGED = 0x8,	/* always detected via a driver */
50 };
51 
52 /**
53  * struct memblock_region - represents a memory region
54  * @base: base address of the region
55  * @size: size of the region
56  * @flags: memory region attributes
57  * @nid: NUMA node id
58  */
59 struct memblock_region {
60 	phys_addr_t base;
61 	phys_addr_t size;
62 	enum memblock_flags flags;
63 #ifdef CONFIG_NUMA
64 	int nid;
65 #endif
66 };
67 
68 /**
69  * struct memblock_type - collection of memory regions of certain type
70  * @cnt: number of regions
71  * @max: size of the allocated array
72  * @total_size: size of all regions
73  * @regions: array of regions
74  * @name: the memory type symbolic name
75  */
76 struct memblock_type {
77 	unsigned long cnt;
78 	unsigned long max;
79 	phys_addr_t total_size;
80 	struct memblock_region *regions;
81 	char *name;
82 };
83 
84 /**
85  * struct memblock - memblock allocator metadata
86  * @bottom_up: is bottom up direction?
87  * @current_limit: physical address of the current allocation limit
88  * @memory: usable memory regions
89  * @reserved: reserved memory regions
90  */
91 struct memblock {
92 	bool bottom_up;  /* is bottom up direction? */
93 	phys_addr_t current_limit;
94 	struct memblock_type memory;
95 	struct memblock_type reserved;
96 };
97 
98 extern struct memblock memblock;
99 
100 #ifndef CONFIG_ARCH_KEEP_MEMBLOCK
101 #define __init_memblock __meminit
102 #define __initdata_memblock __meminitdata
103 void memblock_discard(void);
104 #else
105 #define __init_memblock
106 #define __initdata_memblock
memblock_discard(void)107 static inline void memblock_discard(void) {}
108 #endif
109 
110 void memblock_allow_resize(void);
111 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid,
112 		      enum memblock_flags flags);
113 int memblock_add(phys_addr_t base, phys_addr_t size);
114 int memblock_remove(phys_addr_t base, phys_addr_t size);
115 int memblock_phys_free(phys_addr_t base, phys_addr_t size);
116 int memblock_reserve(phys_addr_t base, phys_addr_t size);
117 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
118 int memblock_physmem_add(phys_addr_t base, phys_addr_t size);
119 #endif
120 void memblock_trim_memory(phys_addr_t align);
121 bool memblock_overlaps_region(struct memblock_type *type,
122 			      phys_addr_t base, phys_addr_t size);
123 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
124 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
125 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
126 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size);
127 int memblock_clear_nomap(phys_addr_t base, phys_addr_t size);
128 
129 void memblock_free_all(void);
130 void memblock_free(void *ptr, size_t size);
131 void reset_node_managed_pages(pg_data_t *pgdat);
132 void reset_all_zones_managed_pages(void);
133 
134 /* Low level functions */
135 void __next_mem_range(u64 *idx, int nid, enum memblock_flags flags,
136 		      struct memblock_type *type_a,
137 		      struct memblock_type *type_b, phys_addr_t *out_start,
138 		      phys_addr_t *out_end, int *out_nid);
139 
140 void __next_mem_range_rev(u64 *idx, int nid, enum memblock_flags flags,
141 			  struct memblock_type *type_a,
142 			  struct memblock_type *type_b, phys_addr_t *out_start,
143 			  phys_addr_t *out_end, int *out_nid);
144 
145 void memblock_free_late(phys_addr_t base, phys_addr_t size);
146 
147 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
__next_physmem_range(u64 * idx,struct memblock_type * type,phys_addr_t * out_start,phys_addr_t * out_end)148 static inline void __next_physmem_range(u64 *idx, struct memblock_type *type,
149 					phys_addr_t *out_start,
150 					phys_addr_t *out_end)
151 {
152 	extern struct memblock_type physmem;
153 
154 	__next_mem_range(idx, NUMA_NO_NODE, MEMBLOCK_NONE, &physmem, type,
155 			 out_start, out_end, NULL);
156 }
157 
158 /**
159  * for_each_physmem_range - iterate through physmem areas not included in type.
160  * @i: u64 used as loop variable
161  * @type: ptr to memblock_type which excludes from the iteration, can be %NULL
162  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
163  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
164  */
165 #define for_each_physmem_range(i, type, p_start, p_end)			\
166 	for (i = 0, __next_physmem_range(&i, type, p_start, p_end);	\
167 	     i != (u64)ULLONG_MAX;					\
168 	     __next_physmem_range(&i, type, p_start, p_end))
169 #endif /* CONFIG_HAVE_MEMBLOCK_PHYS_MAP */
170 
171 /**
172  * __for_each_mem_range - iterate through memblock areas from type_a and not
173  * included in type_b. Or just type_a if type_b is NULL.
174  * @i: u64 used as loop variable
175  * @type_a: ptr to memblock_type to iterate
176  * @type_b: ptr to memblock_type which excludes from the iteration
177  * @nid: node selector, %NUMA_NO_NODE for all nodes
178  * @flags: pick from blocks based on memory attributes
179  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
180  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
181  * @p_nid: ptr to int for nid of the range, can be %NULL
182  */
183 #define __for_each_mem_range(i, type_a, type_b, nid, flags,		\
184 			   p_start, p_end, p_nid)			\
185 	for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b,	\
186 				     p_start, p_end, p_nid);		\
187 	     i != (u64)ULLONG_MAX;					\
188 	     __next_mem_range(&i, nid, flags, type_a, type_b,		\
189 			      p_start, p_end, p_nid))
190 
191 /**
192  * __for_each_mem_range_rev - reverse iterate through memblock areas from
193  * type_a and not included in type_b. Or just type_a if type_b is NULL.
194  * @i: u64 used as loop variable
195  * @type_a: ptr to memblock_type to iterate
196  * @type_b: ptr to memblock_type which excludes from the iteration
197  * @nid: node selector, %NUMA_NO_NODE for all nodes
198  * @flags: pick from blocks based on memory attributes
199  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
200  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
201  * @p_nid: ptr to int for nid of the range, can be %NULL
202  */
203 #define __for_each_mem_range_rev(i, type_a, type_b, nid, flags,		\
204 				 p_start, p_end, p_nid)			\
205 	for (i = (u64)ULLONG_MAX,					\
206 		     __next_mem_range_rev(&i, nid, flags, type_a, type_b, \
207 					  p_start, p_end, p_nid);	\
208 	     i != (u64)ULLONG_MAX;					\
209 	     __next_mem_range_rev(&i, nid, flags, type_a, type_b,	\
210 				  p_start, p_end, p_nid))
211 
212 /**
213  * for_each_mem_range - iterate through memory areas.
214  * @i: u64 used as loop variable
215  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
216  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
217  */
218 #define for_each_mem_range(i, p_start, p_end) \
219 	__for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE,	\
220 			     MEMBLOCK_HOTPLUG | MEMBLOCK_DRIVER_MANAGED, \
221 			     p_start, p_end, NULL)
222 
223 /**
224  * for_each_mem_range_rev - reverse iterate through memblock areas from
225  * type_a and not included in type_b. Or just type_a if type_b is NULL.
226  * @i: u64 used as loop variable
227  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
228  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
229  */
230 #define for_each_mem_range_rev(i, p_start, p_end)			\
231 	__for_each_mem_range_rev(i, &memblock.memory, NULL, NUMA_NO_NODE, \
232 				 MEMBLOCK_HOTPLUG | MEMBLOCK_DRIVER_MANAGED,\
233 				 p_start, p_end, NULL)
234 
235 /**
236  * for_each_reserved_mem_range - iterate over all reserved memblock areas
237  * @i: u64 used as loop variable
238  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
239  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
240  *
241  * Walks over reserved areas of memblock. Available as soon as memblock
242  * is initialized.
243  */
244 #define for_each_reserved_mem_range(i, p_start, p_end)			\
245 	__for_each_mem_range(i, &memblock.reserved, NULL, NUMA_NO_NODE,	\
246 			     MEMBLOCK_NONE, p_start, p_end, NULL)
247 
memblock_is_hotpluggable(struct memblock_region * m)248 static inline bool memblock_is_hotpluggable(struct memblock_region *m)
249 {
250 	return m->flags & MEMBLOCK_HOTPLUG;
251 }
252 
memblock_is_mirror(struct memblock_region * m)253 static inline bool memblock_is_mirror(struct memblock_region *m)
254 {
255 	return m->flags & MEMBLOCK_MIRROR;
256 }
257 
memblock_is_nomap(struct memblock_region * m)258 static inline bool memblock_is_nomap(struct memblock_region *m)
259 {
260 	return m->flags & MEMBLOCK_NOMAP;
261 }
262 
memblock_is_driver_managed(struct memblock_region * m)263 static inline bool memblock_is_driver_managed(struct memblock_region *m)
264 {
265 	return m->flags & MEMBLOCK_DRIVER_MANAGED;
266 }
267 
268 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
269 			    unsigned long  *end_pfn);
270 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
271 			  unsigned long *out_end_pfn, int *out_nid);
272 
273 /**
274  * for_each_mem_pfn_range - early memory pfn range iterator
275  * @i: an integer used as loop variable
276  * @nid: node selector, %MAX_NUMNODES for all nodes
277  * @p_start: ptr to ulong for start pfn of the range, can be %NULL
278  * @p_end: ptr to ulong for end pfn of the range, can be %NULL
279  * @p_nid: ptr to int for nid of the range, can be %NULL
280  *
281  * Walks over configured memory ranges.
282  */
283 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)		\
284 	for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
285 	     i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
286 
287 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
288 void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
289 				  unsigned long *out_spfn,
290 				  unsigned long *out_epfn);
291 /**
292  * for_each_free_mem_pfn_range_in_zone - iterate through zone specific free
293  * memblock areas
294  * @i: u64 used as loop variable
295  * @zone: zone in which all of the memory blocks reside
296  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
297  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
298  *
299  * Walks over free (memory && !reserved) areas of memblock in a specific
300  * zone. Available once memblock and an empty zone is initialized. The main
301  * assumption is that the zone start, end, and pgdat have been associated.
302  * This way we can use the zone to determine NUMA node, and if a given part
303  * of the memblock is valid for the zone.
304  */
305 #define for_each_free_mem_pfn_range_in_zone(i, zone, p_start, p_end)	\
306 	for (i = 0,							\
307 	     __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end);	\
308 	     i != U64_MAX;					\
309 	     __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))
310 
311 /**
312  * for_each_free_mem_pfn_range_in_zone_from - iterate through zone specific
313  * free memblock areas from a given point
314  * @i: u64 used as loop variable
315  * @zone: zone in which all of the memory blocks reside
316  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
317  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
318  *
319  * Walks over free (memory && !reserved) areas of memblock in a specific
320  * zone, continuing from current position. Available as soon as memblock is
321  * initialized.
322  */
323 #define for_each_free_mem_pfn_range_in_zone_from(i, zone, p_start, p_end) \
324 	for (; i != U64_MAX;					  \
325 	     __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))
326 
327 int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask);
328 
329 #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
330 
331 /**
332  * for_each_free_mem_range - iterate through free memblock areas
333  * @i: u64 used as loop variable
334  * @nid: node selector, %NUMA_NO_NODE for all nodes
335  * @flags: pick from blocks based on memory attributes
336  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
337  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
338  * @p_nid: ptr to int for nid of the range, can be %NULL
339  *
340  * Walks over free (memory && !reserved) areas of memblock.  Available as
341  * soon as memblock is initialized.
342  */
343 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid)	\
344 	__for_each_mem_range(i, &memblock.memory, &memblock.reserved,	\
345 			     nid, flags, p_start, p_end, p_nid)
346 
347 /**
348  * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
349  * @i: u64 used as loop variable
350  * @nid: node selector, %NUMA_NO_NODE for all nodes
351  * @flags: pick from blocks based on memory attributes
352  * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
353  * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
354  * @p_nid: ptr to int for nid of the range, can be %NULL
355  *
356  * Walks over free (memory && !reserved) areas of memblock in reverse
357  * order.  Available as soon as memblock is initialized.
358  */
359 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end,	\
360 					p_nid)				\
361 	__for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \
362 				 nid, flags, p_start, p_end, p_nid)
363 
364 int memblock_set_node(phys_addr_t base, phys_addr_t size,
365 		      struct memblock_type *type, int nid);
366 
367 #ifdef CONFIG_NUMA
memblock_set_region_node(struct memblock_region * r,int nid)368 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
369 {
370 	r->nid = nid;
371 }
372 
memblock_get_region_node(const struct memblock_region * r)373 static inline int memblock_get_region_node(const struct memblock_region *r)
374 {
375 	return r->nid;
376 }
377 #else
memblock_set_region_node(struct memblock_region * r,int nid)378 static inline void memblock_set_region_node(struct memblock_region *r, int nid)
379 {
380 }
381 
memblock_get_region_node(const struct memblock_region * r)382 static inline int memblock_get_region_node(const struct memblock_region *r)
383 {
384 	return 0;
385 }
386 #endif /* CONFIG_NUMA */
387 
388 /* Flags for memblock allocation APIs */
389 #define MEMBLOCK_ALLOC_ANYWHERE	(~(phys_addr_t)0)
390 #define MEMBLOCK_ALLOC_ACCESSIBLE	0
391 #define MEMBLOCK_ALLOC_NOLEAKTRACE	1
392 
393 /* We are using top down, so it is safe to use 0 here */
394 #define MEMBLOCK_LOW_LIMIT 0
395 
396 #ifndef ARCH_LOW_ADDRESS_LIMIT
397 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
398 #endif
399 
400 phys_addr_t memblock_phys_alloc_range(phys_addr_t size, phys_addr_t align,
401 				      phys_addr_t start, phys_addr_t end);
402 phys_addr_t memblock_alloc_range_nid(phys_addr_t size,
403 				      phys_addr_t align, phys_addr_t start,
404 				      phys_addr_t end, int nid, bool exact_nid);
405 phys_addr_t memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
406 
memblock_phys_alloc(phys_addr_t size,phys_addr_t align)407 static __always_inline phys_addr_t memblock_phys_alloc(phys_addr_t size,
408 						       phys_addr_t align)
409 {
410 	return memblock_phys_alloc_range(size, align, 0,
411 					 MEMBLOCK_ALLOC_ACCESSIBLE);
412 }
413 
414 void *memblock_alloc_exact_nid_raw(phys_addr_t size, phys_addr_t align,
415 				 phys_addr_t min_addr, phys_addr_t max_addr,
416 				 int nid);
417 void *memblock_alloc_try_nid_raw(phys_addr_t size, phys_addr_t align,
418 				 phys_addr_t min_addr, phys_addr_t max_addr,
419 				 int nid);
420 void *memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
421 			     phys_addr_t min_addr, phys_addr_t max_addr,
422 			     int nid);
423 
memblock_alloc(phys_addr_t size,phys_addr_t align)424 static __always_inline void *memblock_alloc(phys_addr_t size, phys_addr_t align)
425 {
426 	return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
427 				      MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);
428 }
429 
memblock_alloc_raw(phys_addr_t size,phys_addr_t align)430 static inline void *memblock_alloc_raw(phys_addr_t size,
431 					       phys_addr_t align)
432 {
433 	return memblock_alloc_try_nid_raw(size, align, MEMBLOCK_LOW_LIMIT,
434 					  MEMBLOCK_ALLOC_ACCESSIBLE,
435 					  NUMA_NO_NODE);
436 }
437 
memblock_alloc_from(phys_addr_t size,phys_addr_t align,phys_addr_t min_addr)438 static inline void *memblock_alloc_from(phys_addr_t size,
439 						phys_addr_t align,
440 						phys_addr_t min_addr)
441 {
442 	return memblock_alloc_try_nid(size, align, min_addr,
443 				      MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);
444 }
445 
memblock_alloc_low(phys_addr_t size,phys_addr_t align)446 static inline void *memblock_alloc_low(phys_addr_t size,
447 					       phys_addr_t align)
448 {
449 	return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
450 				      ARCH_LOW_ADDRESS_LIMIT, NUMA_NO_NODE);
451 }
452 
memblock_alloc_node(phys_addr_t size,phys_addr_t align,int nid)453 static inline void *memblock_alloc_node(phys_addr_t size,
454 						phys_addr_t align, int nid)
455 {
456 	return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
457 				      MEMBLOCK_ALLOC_ACCESSIBLE, nid);
458 }
459 
460 /*
461  * Set the allocation direction to bottom-up or top-down.
462  */
memblock_set_bottom_up(bool enable)463 static inline __init_memblock void memblock_set_bottom_up(bool enable)
464 {
465 	memblock.bottom_up = enable;
466 }
467 
468 /*
469  * Check if the allocation direction is bottom-up or not.
470  * if this is true, that said, memblock will allocate memory
471  * in bottom-up direction.
472  */
memblock_bottom_up(void)473 static inline __init_memblock bool memblock_bottom_up(void)
474 {
475 	return memblock.bottom_up;
476 }
477 
478 phys_addr_t memblock_phys_mem_size(void);
479 phys_addr_t memblock_reserved_size(void);
480 phys_addr_t memblock_start_of_DRAM(void);
481 phys_addr_t memblock_end_of_DRAM(void);
482 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
483 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size);
484 void memblock_mem_limit_remove_map(phys_addr_t limit);
485 bool memblock_is_memory(phys_addr_t addr);
486 bool memblock_is_map_memory(phys_addr_t addr);
487 bool memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
488 bool memblock_is_reserved(phys_addr_t addr);
489 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
490 
491 void memblock_dump_all(void);
492 
493 /**
494  * memblock_set_current_limit - Set the current allocation limit to allow
495  *                         limiting allocations to what is currently
496  *                         accessible during boot
497  * @limit: New limit value (physical address)
498  */
499 void memblock_set_current_limit(phys_addr_t limit);
500 
501 
502 phys_addr_t memblock_get_current_limit(void);
503 
504 /*
505  * pfn conversion functions
506  *
507  * While the memory MEMBLOCKs should always be page aligned, the reserved
508  * MEMBLOCKs may not be. This accessor attempt to provide a very clear
509  * idea of what they return for such non aligned MEMBLOCKs.
510  */
511 
512 /**
513  * memblock_region_memory_base_pfn - get the lowest pfn of the memory region
514  * @reg: memblock_region structure
515  *
516  * Return: the lowest pfn intersecting with the memory region
517  */
memblock_region_memory_base_pfn(const struct memblock_region * reg)518 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
519 {
520 	return PFN_UP(reg->base);
521 }
522 
523 /**
524  * memblock_region_memory_end_pfn - get the end pfn of the memory region
525  * @reg: memblock_region structure
526  *
527  * Return: the end_pfn of the reserved region
528  */
memblock_region_memory_end_pfn(const struct memblock_region * reg)529 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
530 {
531 	return PFN_DOWN(reg->base + reg->size);
532 }
533 
534 /**
535  * memblock_region_reserved_base_pfn - get the lowest pfn of the reserved region
536  * @reg: memblock_region structure
537  *
538  * Return: the lowest pfn intersecting with the reserved region
539  */
memblock_region_reserved_base_pfn(const struct memblock_region * reg)540 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
541 {
542 	return PFN_DOWN(reg->base);
543 }
544 
545 /**
546  * memblock_region_reserved_end_pfn - get the end pfn of the reserved region
547  * @reg: memblock_region structure
548  *
549  * Return: the end_pfn of the reserved region
550  */
memblock_region_reserved_end_pfn(const struct memblock_region * reg)551 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
552 {
553 	return PFN_UP(reg->base + reg->size);
554 }
555 
556 /**
557  * for_each_mem_region - itereate over memory regions
558  * @region: loop variable
559  */
560 #define for_each_mem_region(region)					\
561 	for (region = memblock.memory.regions;				\
562 	     region < (memblock.memory.regions + memblock.memory.cnt);	\
563 	     region++)
564 
565 /**
566  * for_each_reserved_mem_region - itereate over reserved memory regions
567  * @region: loop variable
568  */
569 #define for_each_reserved_mem_region(region)				\
570 	for (region = memblock.reserved.regions;			\
571 	     region < (memblock.reserved.regions + memblock.reserved.cnt); \
572 	     region++)
573 
574 extern void *alloc_large_system_hash(const char *tablename,
575 				     unsigned long bucketsize,
576 				     unsigned long numentries,
577 				     int scale,
578 				     int flags,
579 				     unsigned int *_hash_shift,
580 				     unsigned int *_hash_mask,
581 				     unsigned long low_limit,
582 				     unsigned long high_limit);
583 
584 #define HASH_EARLY	0x00000001	/* Allocating during early boot? */
585 #define HASH_SMALL	0x00000002	/* sub-page allocation allowed, min
586 					 * shift passed via *_hash_shift */
587 #define HASH_ZERO	0x00000004	/* Zero allocated hash table */
588 
589 /* Only NUMA needs hash distribution. 64bit NUMA architectures have
590  * sufficient vmalloc space.
591  */
592 #ifdef CONFIG_NUMA
593 #define HASHDIST_DEFAULT IS_ENABLED(CONFIG_64BIT)
594 extern int hashdist;		/* Distribute hashes across NUMA nodes? */
595 #else
596 #define hashdist (0)
597 #endif
598 
599 #ifdef CONFIG_MEMTEST
600 extern void early_memtest(phys_addr_t start, phys_addr_t end);
601 #else
early_memtest(phys_addr_t start,phys_addr_t end)602 static inline void early_memtest(phys_addr_t start, phys_addr_t end)
603 {
604 }
605 #endif
606 
607 
608 #endif /* _LINUX_MEMBLOCK_H */
609