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Yinghai Lu95f72d12010-07-12 14:36:09 +10001/*
2 * Procedures for maintaining information about logical memory blocks.
3 *
4 * Peter Bergner, IBM Corp. June 2001.
5 * Copyright (C) 2001 Peter Bergner.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#include <linux/kernel.h>
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -070014#include <linux/slab.h>
Yinghai Lu95f72d12010-07-12 14:36:09 +100015#include <linux/init.h>
16#include <linux/bitops.h>
Benjamin Herrenschmidt449e8df2010-07-06 15:39:07 -070017#include <linux/poison.h>
Benjamin Herrenschmidtc196f762010-07-06 15:39:16 -070018#include <linux/pfn.h>
Benjamin Herrenschmidt6d03b882010-07-06 15:39:19 -070019#include <linux/debugfs.h>
20#include <linux/seq_file.h>
Yinghai Lu95f72d12010-07-12 14:36:09 +100021#include <linux/memblock.h>
22
Tejun Heofe091c22011-12-08 10:22:07 -080023static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
24static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
25
26struct memblock memblock __initdata_memblock = {
27 .memory.regions = memblock_memory_init_regions,
28 .memory.cnt = 1, /* empty dummy entry */
29 .memory.max = INIT_MEMBLOCK_REGIONS,
30
31 .reserved.regions = memblock_reserved_init_regions,
32 .reserved.cnt = 1, /* empty dummy entry */
33 .reserved.max = INIT_MEMBLOCK_REGIONS,
34
35 .current_limit = MEMBLOCK_ALLOC_ANYWHERE,
36};
Yinghai Lu95f72d12010-07-12 14:36:09 +100037
Yinghai Lu10d06432010-07-28 15:43:02 +100038int memblock_debug __initdata_memblock;
Tejun Heo1aadc052011-12-08 10:22:08 -080039static int memblock_can_resize __initdata_memblock;
Gavin Shan181eb392012-05-29 15:06:50 -070040static int memblock_memory_in_slab __initdata_memblock = 0;
41static int memblock_reserved_in_slab __initdata_memblock = 0;
Yinghai Lu95f72d12010-07-12 14:36:09 +100042
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -070043/* inline so we don't get a warning when pr_debug is compiled out */
Raghavendra D Prabhuc2233112012-10-08 16:33:55 -070044static __init_memblock const char *
45memblock_type_name(struct memblock_type *type)
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -070046{
47 if (type == &memblock.memory)
48 return "memory";
49 else if (type == &memblock.reserved)
50 return "reserved";
51 else
52 return "unknown";
53}
54
Tejun Heoeb18f1b2011-12-08 10:22:07 -080055/* adjust *@size so that (@base + *@size) doesn't overflow, return new size */
56static inline phys_addr_t memblock_cap_size(phys_addr_t base, phys_addr_t *size)
57{
58 return *size = min(*size, (phys_addr_t)ULLONG_MAX - base);
59}
60
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +100061/*
62 * Address comparison utilities
63 */
Yinghai Lu10d06432010-07-28 15:43:02 +100064static unsigned long __init_memblock memblock_addrs_overlap(phys_addr_t base1, phys_addr_t size1,
Benjamin Herrenschmidt2898cc42010-08-04 13:34:42 +100065 phys_addr_t base2, phys_addr_t size2)
Yinghai Lu95f72d12010-07-12 14:36:09 +100066{
67 return ((base1 < (base2 + size2)) && (base2 < (base1 + size1)));
68}
69
H Hartley Sweeten2d7d3eb2011-10-31 17:09:15 -070070static long __init_memblock memblock_overlaps_region(struct memblock_type *type,
71 phys_addr_t base, phys_addr_t size)
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +100072{
73 unsigned long i;
74
75 for (i = 0; i < type->cnt; i++) {
76 phys_addr_t rgnbase = type->regions[i].base;
77 phys_addr_t rgnsize = type->regions[i].size;
78 if (memblock_addrs_overlap(base, size, rgnbase, rgnsize))
79 break;
80 }
81
82 return (i < type->cnt) ? i : -1;
83}
84
Tejun Heo7bd0b0f2011-12-08 10:22:09 -080085/**
86 * memblock_find_in_range_node - find free area in given range and node
87 * @start: start of candidate range
88 * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
89 * @size: size of free area to find
90 * @align: alignment of free area to find
91 * @nid: nid of the free area to find, %MAX_NUMNODES for any node
92 *
93 * Find @size free area aligned to @align in the specified range and node.
94 *
95 * RETURNS:
96 * Found address on success, %0 on failure.
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +100097 */
Tang Chenf7210e62013-02-22 16:33:51 -080098phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
99 phys_addr_t end, phys_addr_t size,
100 phys_addr_t align, int nid)
101{
102 phys_addr_t this_start, this_end, cand;
103 u64 i;
104
105 /* pump up @end */
106 if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
107 end = memblock.current_limit;
108
109 /* avoid allocating the first page */
110 start = max_t(phys_addr_t, start, PAGE_SIZE);
111 end = max(start, end);
112
113 for_each_free_mem_range_reverse(i, nid, &this_start, &this_end, NULL) {
114 this_start = clamp(this_start, start, end);
115 this_end = clamp(this_end, start, end);
116
117 if (this_end < size)
118 continue;
119
120 cand = round_down(this_end - size, align);
121 if (cand >= this_start)
122 return cand;
123 }
124 return 0;
125}
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +1000126
Tejun Heo7bd0b0f2011-12-08 10:22:09 -0800127/**
128 * memblock_find_in_range - find free area in given range
129 * @start: start of candidate range
130 * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
131 * @size: size of free area to find
132 * @align: alignment of free area to find
133 *
134 * Find @size free area aligned to @align in the specified range.
135 *
136 * RETURNS:
137 * Found address on success, %0 on failure.
138 */
139phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start,
140 phys_addr_t end, phys_addr_t size,
141 phys_addr_t align)
142{
143 return memblock_find_in_range_node(start, end, size, align,
144 MAX_NUMNODES);
145}
146
Yinghai Lu10d06432010-07-28 15:43:02 +1000147static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000148{
Tejun Heo1440c4e2011-12-08 10:22:08 -0800149 type->total_size -= type->regions[r].size;
Tejun Heo7c0caeb2011-07-14 11:43:42 +0200150 memmove(&type->regions[r], &type->regions[r + 1],
151 (type->cnt - (r + 1)) * sizeof(type->regions[r]));
Benjamin Herrenschmidte3239ff2010-08-04 14:06:41 +1000152 type->cnt--;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000153
Benjamin Herrenschmidt8f7a6602011-03-22 16:33:43 -0700154 /* Special case for empty arrays */
155 if (type->cnt == 0) {
Tejun Heo1440c4e2011-12-08 10:22:08 -0800156 WARN_ON(type->total_size != 0);
Benjamin Herrenschmidt8f7a6602011-03-22 16:33:43 -0700157 type->cnt = 1;
158 type->regions[0].base = 0;
159 type->regions[0].size = 0;
Tejun Heo7c0caeb2011-07-14 11:43:42 +0200160 memblock_set_region_node(&type->regions[0], MAX_NUMNODES);
Benjamin Herrenschmidt8f7a6602011-03-22 16:33:43 -0700161 }
Yinghai Lu95f72d12010-07-12 14:36:09 +1000162}
163
Yinghai Lu29f67382012-07-11 14:02:56 -0700164phys_addr_t __init_memblock get_allocated_memblock_reserved_regions_info(
165 phys_addr_t *addr)
166{
167 if (memblock.reserved.regions == memblock_reserved_init_regions)
168 return 0;
169
170 *addr = __pa(memblock.reserved.regions);
171
172 return PAGE_ALIGN(sizeof(struct memblock_region) *
173 memblock.reserved.max);
174}
175
Greg Pearson48c3b582012-06-20 12:53:05 -0700176/**
177 * memblock_double_array - double the size of the memblock regions array
178 * @type: memblock type of the regions array being doubled
179 * @new_area_start: starting address of memory range to avoid overlap with
180 * @new_area_size: size of memory range to avoid overlap with
181 *
182 * Double the size of the @type regions array. If memblock is being used to
183 * allocate memory for a new reserved regions array and there is a previously
184 * allocated memory range [@new_area_start,@new_area_start+@new_area_size]
185 * waiting to be reserved, ensure the memory used by the new array does
186 * not overlap.
187 *
188 * RETURNS:
189 * 0 on success, -1 on failure.
190 */
191static int __init_memblock memblock_double_array(struct memblock_type *type,
192 phys_addr_t new_area_start,
193 phys_addr_t new_area_size)
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700194{
195 struct memblock_region *new_array, *old_array;
Yinghai Lu29f67382012-07-11 14:02:56 -0700196 phys_addr_t old_alloc_size, new_alloc_size;
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700197 phys_addr_t old_size, new_size, addr;
198 int use_slab = slab_is_available();
Gavin Shan181eb392012-05-29 15:06:50 -0700199 int *in_slab;
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700200
201 /* We don't allow resizing until we know about the reserved regions
202 * of memory that aren't suitable for allocation
203 */
204 if (!memblock_can_resize)
205 return -1;
206
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700207 /* Calculate new doubled size */
208 old_size = type->max * sizeof(struct memblock_region);
209 new_size = old_size << 1;
Yinghai Lu29f67382012-07-11 14:02:56 -0700210 /*
211 * We need to allocated new one align to PAGE_SIZE,
212 * so we can free them completely later.
213 */
214 old_alloc_size = PAGE_ALIGN(old_size);
215 new_alloc_size = PAGE_ALIGN(new_size);
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700216
Gavin Shan181eb392012-05-29 15:06:50 -0700217 /* Retrieve the slab flag */
218 if (type == &memblock.memory)
219 in_slab = &memblock_memory_in_slab;
220 else
221 in_slab = &memblock_reserved_in_slab;
222
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700223 /* Try to find some space for it.
224 *
225 * WARNING: We assume that either slab_is_available() and we use it or
Andrew Mortonfd073832012-07-31 16:42:40 -0700226 * we use MEMBLOCK for allocations. That means that this is unsafe to
227 * use when bootmem is currently active (unless bootmem itself is
228 * implemented on top of MEMBLOCK which isn't the case yet)
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700229 *
230 * This should however not be an issue for now, as we currently only
Andrew Mortonfd073832012-07-31 16:42:40 -0700231 * call into MEMBLOCK while it's still active, or much later when slab
232 * is active for memory hotplug operations
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700233 */
234 if (use_slab) {
235 new_array = kmalloc(new_size, GFP_KERNEL);
Tejun Heo1f5026a2011-07-12 09:58:09 +0200236 addr = new_array ? __pa(new_array) : 0;
Gavin Shan4e2f0772012-05-29 15:06:50 -0700237 } else {
Greg Pearson48c3b582012-06-20 12:53:05 -0700238 /* only exclude range when trying to double reserved.regions */
239 if (type != &memblock.reserved)
240 new_area_start = new_area_size = 0;
241
242 addr = memblock_find_in_range(new_area_start + new_area_size,
243 memblock.current_limit,
Yinghai Lu29f67382012-07-11 14:02:56 -0700244 new_alloc_size, PAGE_SIZE);
Greg Pearson48c3b582012-06-20 12:53:05 -0700245 if (!addr && new_area_size)
246 addr = memblock_find_in_range(0,
Andrew Mortonfd073832012-07-31 16:42:40 -0700247 min(new_area_start, memblock.current_limit),
248 new_alloc_size, PAGE_SIZE);
Greg Pearson48c3b582012-06-20 12:53:05 -0700249
Sachin Kamat15674862012-09-04 13:55:05 +0530250 new_array = addr ? __va(addr) : NULL;
Gavin Shan4e2f0772012-05-29 15:06:50 -0700251 }
Tejun Heo1f5026a2011-07-12 09:58:09 +0200252 if (!addr) {
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700253 pr_err("memblock: Failed to double %s array from %ld to %ld entries !\n",
254 memblock_type_name(type), type->max, type->max * 2);
255 return -1;
256 }
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700257
Andrew Mortonfd073832012-07-31 16:42:40 -0700258 memblock_dbg("memblock: %s is doubled to %ld at [%#010llx-%#010llx]",
259 memblock_type_name(type), type->max * 2, (u64)addr,
260 (u64)addr + new_size - 1);
Yinghai Luea9e4372010-07-28 15:13:22 +1000261
Andrew Mortonfd073832012-07-31 16:42:40 -0700262 /*
263 * Found space, we now need to move the array over before we add the
264 * reserved region since it may be our reserved array itself that is
265 * full.
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700266 */
267 memcpy(new_array, type->regions, old_size);
268 memset(new_array + type->max, 0, old_size);
269 old_array = type->regions;
270 type->regions = new_array;
271 type->max <<= 1;
272
Andrew Mortonfd073832012-07-31 16:42:40 -0700273 /* Free old array. We needn't free it if the array is the static one */
Gavin Shan181eb392012-05-29 15:06:50 -0700274 if (*in_slab)
275 kfree(old_array);
276 else if (old_array != memblock_memory_init_regions &&
277 old_array != memblock_reserved_init_regions)
Yinghai Lu29f67382012-07-11 14:02:56 -0700278 memblock_free(__pa(old_array), old_alloc_size);
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700279
Andrew Mortonfd073832012-07-31 16:42:40 -0700280 /*
281 * Reserve the new array if that comes from the memblock. Otherwise, we
282 * needn't do it
Gavin Shan181eb392012-05-29 15:06:50 -0700283 */
284 if (!use_slab)
Yinghai Lu29f67382012-07-11 14:02:56 -0700285 BUG_ON(memblock_reserve(addr, new_alloc_size));
Gavin Shan181eb392012-05-29 15:06:50 -0700286
287 /* Update slab flag */
288 *in_slab = use_slab;
289
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700290 return 0;
291}
292
Tejun Heo784656f92011-07-12 11:15:55 +0200293/**
294 * memblock_merge_regions - merge neighboring compatible regions
295 * @type: memblock type to scan
296 *
297 * Scan @type and merge neighboring compatible regions.
298 */
299static void __init_memblock memblock_merge_regions(struct memblock_type *type)
300{
301 int i = 0;
302
303 /* cnt never goes below 1 */
304 while (i < type->cnt - 1) {
305 struct memblock_region *this = &type->regions[i];
306 struct memblock_region *next = &type->regions[i + 1];
307
Tejun Heo7c0caeb2011-07-14 11:43:42 +0200308 if (this->base + this->size != next->base ||
309 memblock_get_region_node(this) !=
310 memblock_get_region_node(next)) {
Tejun Heo784656f92011-07-12 11:15:55 +0200311 BUG_ON(this->base + this->size > next->base);
312 i++;
313 continue;
314 }
315
316 this->size += next->size;
Lin Fengc0232ae2013-01-11 14:31:44 -0800317 /* move forward from next + 1, index of which is i + 2 */
318 memmove(next, next + 1, (type->cnt - (i + 2)) * sizeof(*next));
Tejun Heo784656f92011-07-12 11:15:55 +0200319 type->cnt--;
320 }
321}
322
323/**
324 * memblock_insert_region - insert new memblock region
Tang Chen209ff862013-04-29 15:08:41 -0700325 * @type: memblock type to insert into
326 * @idx: index for the insertion point
327 * @base: base address of the new region
328 * @size: size of the new region
329 * @nid: node id of the new region
Tejun Heo784656f92011-07-12 11:15:55 +0200330 *
331 * Insert new memblock region [@base,@base+@size) into @type at @idx.
332 * @type must already have extra room to accomodate the new region.
333 */
334static void __init_memblock memblock_insert_region(struct memblock_type *type,
335 int idx, phys_addr_t base,
Tejun Heo7c0caeb2011-07-14 11:43:42 +0200336 phys_addr_t size, int nid)
Tejun Heo784656f92011-07-12 11:15:55 +0200337{
338 struct memblock_region *rgn = &type->regions[idx];
339
340 BUG_ON(type->cnt >= type->max);
341 memmove(rgn + 1, rgn, (type->cnt - idx) * sizeof(*rgn));
342 rgn->base = base;
343 rgn->size = size;
Tejun Heo7c0caeb2011-07-14 11:43:42 +0200344 memblock_set_region_node(rgn, nid);
Tejun Heo784656f92011-07-12 11:15:55 +0200345 type->cnt++;
Tejun Heo1440c4e2011-12-08 10:22:08 -0800346 type->total_size += size;
Tejun Heo784656f92011-07-12 11:15:55 +0200347}
348
349/**
350 * memblock_add_region - add new memblock region
351 * @type: memblock type to add new region into
352 * @base: base address of the new region
353 * @size: size of the new region
Tejun Heo7fb0bc32011-12-08 10:22:08 -0800354 * @nid: nid of the new region
Tejun Heo784656f92011-07-12 11:15:55 +0200355 *
356 * Add new memblock region [@base,@base+@size) into @type. The new region
357 * is allowed to overlap with existing ones - overlaps don't affect already
358 * existing regions. @type is guaranteed to be minimal (all neighbouring
359 * compatible regions are merged) after the addition.
360 *
361 * RETURNS:
362 * 0 on success, -errno on failure.
363 */
Tejun Heo581adcb2011-12-08 10:22:06 -0800364static int __init_memblock memblock_add_region(struct memblock_type *type,
Tejun Heo7fb0bc32011-12-08 10:22:08 -0800365 phys_addr_t base, phys_addr_t size, int nid)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000366{
Tejun Heo784656f92011-07-12 11:15:55 +0200367 bool insert = false;
Tejun Heoeb18f1b2011-12-08 10:22:07 -0800368 phys_addr_t obase = base;
369 phys_addr_t end = base + memblock_cap_size(base, &size);
Tejun Heo784656f92011-07-12 11:15:55 +0200370 int i, nr_new;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000371
Tejun Heob3dc6272012-04-20 08:31:34 -0700372 if (!size)
373 return 0;
374
Tejun Heo784656f92011-07-12 11:15:55 +0200375 /* special case for empty array */
376 if (type->regions[0].size == 0) {
Tejun Heo1440c4e2011-12-08 10:22:08 -0800377 WARN_ON(type->cnt != 1 || type->total_size);
Benjamin Herrenschmidte3239ff2010-08-04 14:06:41 +1000378 type->regions[0].base = base;
379 type->regions[0].size = size;
Tejun Heo7fb0bc32011-12-08 10:22:08 -0800380 memblock_set_region_node(&type->regions[0], nid);
Tejun Heo1440c4e2011-12-08 10:22:08 -0800381 type->total_size = size;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000382 return 0;
383 }
Tejun Heo784656f92011-07-12 11:15:55 +0200384repeat:
385 /*
386 * The following is executed twice. Once with %false @insert and
387 * then with %true. The first counts the number of regions needed
388 * to accomodate the new area. The second actually inserts them.
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700389 */
Tejun Heo784656f92011-07-12 11:15:55 +0200390 base = obase;
391 nr_new = 0;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000392
Tejun Heo784656f92011-07-12 11:15:55 +0200393 for (i = 0; i < type->cnt; i++) {
394 struct memblock_region *rgn = &type->regions[i];
395 phys_addr_t rbase = rgn->base;
396 phys_addr_t rend = rbase + rgn->size;
397
398 if (rbase >= end)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000399 break;
Tejun Heo784656f92011-07-12 11:15:55 +0200400 if (rend <= base)
401 continue;
402 /*
403 * @rgn overlaps. If it separates the lower part of new
404 * area, insert that portion.
405 */
406 if (rbase > base) {
407 nr_new++;
408 if (insert)
409 memblock_insert_region(type, i++, base,
Tejun Heo7fb0bc32011-12-08 10:22:08 -0800410 rbase - base, nid);
Yinghai Lu95f72d12010-07-12 14:36:09 +1000411 }
Tejun Heo784656f92011-07-12 11:15:55 +0200412 /* area below @rend is dealt with, forget about it */
413 base = min(rend, end);
Yinghai Lu95f72d12010-07-12 14:36:09 +1000414 }
Yinghai Lu95f72d12010-07-12 14:36:09 +1000415
Tejun Heo784656f92011-07-12 11:15:55 +0200416 /* insert the remaining portion */
417 if (base < end) {
418 nr_new++;
419 if (insert)
Tejun Heo7fb0bc32011-12-08 10:22:08 -0800420 memblock_insert_region(type, i, base, end - base, nid);
Tejun Heo784656f92011-07-12 11:15:55 +0200421 }
422
423 /*
424 * If this was the first round, resize array and repeat for actual
425 * insertions; otherwise, merge and return.
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700426 */
Tejun Heo784656f92011-07-12 11:15:55 +0200427 if (!insert) {
428 while (type->cnt + nr_new > type->max)
Greg Pearson48c3b582012-06-20 12:53:05 -0700429 if (memblock_double_array(type, obase, size) < 0)
Tejun Heo784656f92011-07-12 11:15:55 +0200430 return -ENOMEM;
431 insert = true;
432 goto repeat;
433 } else {
434 memblock_merge_regions(type);
435 return 0;
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -0700436 }
Yinghai Lu95f72d12010-07-12 14:36:09 +1000437}
438
Tejun Heo7fb0bc32011-12-08 10:22:08 -0800439int __init_memblock memblock_add_node(phys_addr_t base, phys_addr_t size,
440 int nid)
441{
442 return memblock_add_region(&memblock.memory, base, size, nid);
443}
444
Tejun Heo581adcb2011-12-08 10:22:06 -0800445int __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000446{
Tejun Heo7fb0bc32011-12-08 10:22:08 -0800447 return memblock_add_region(&memblock.memory, base, size, MAX_NUMNODES);
Yinghai Lu95f72d12010-07-12 14:36:09 +1000448}
449
Tejun Heo6a9ceb32011-12-08 10:22:07 -0800450/**
451 * memblock_isolate_range - isolate given range into disjoint memblocks
452 * @type: memblock type to isolate range for
453 * @base: base of range to isolate
454 * @size: size of range to isolate
455 * @start_rgn: out parameter for the start of isolated region
456 * @end_rgn: out parameter for the end of isolated region
457 *
458 * Walk @type and ensure that regions don't cross the boundaries defined by
459 * [@base,@base+@size). Crossing regions are split at the boundaries,
460 * which may create at most two more regions. The index of the first
461 * region inside the range is returned in *@start_rgn and end in *@end_rgn.
462 *
463 * RETURNS:
464 * 0 on success, -errno on failure.
465 */
466static int __init_memblock memblock_isolate_range(struct memblock_type *type,
467 phys_addr_t base, phys_addr_t size,
468 int *start_rgn, int *end_rgn)
469{
Tejun Heoeb18f1b2011-12-08 10:22:07 -0800470 phys_addr_t end = base + memblock_cap_size(base, &size);
Tejun Heo6a9ceb32011-12-08 10:22:07 -0800471 int i;
472
473 *start_rgn = *end_rgn = 0;
474
Tejun Heob3dc6272012-04-20 08:31:34 -0700475 if (!size)
476 return 0;
477
Tejun Heo6a9ceb32011-12-08 10:22:07 -0800478 /* we'll create at most two more regions */
479 while (type->cnt + 2 > type->max)
Greg Pearson48c3b582012-06-20 12:53:05 -0700480 if (memblock_double_array(type, base, size) < 0)
Tejun Heo6a9ceb32011-12-08 10:22:07 -0800481 return -ENOMEM;
482
483 for (i = 0; i < type->cnt; i++) {
484 struct memblock_region *rgn = &type->regions[i];
485 phys_addr_t rbase = rgn->base;
486 phys_addr_t rend = rbase + rgn->size;
487
488 if (rbase >= end)
489 break;
490 if (rend <= base)
491 continue;
492
493 if (rbase < base) {
494 /*
495 * @rgn intersects from below. Split and continue
496 * to process the next region - the new top half.
497 */
498 rgn->base = base;
Tejun Heo1440c4e2011-12-08 10:22:08 -0800499 rgn->size -= base - rbase;
500 type->total_size -= base - rbase;
Tejun Heo6a9ceb32011-12-08 10:22:07 -0800501 memblock_insert_region(type, i, rbase, base - rbase,
Tejun Heo71936182011-12-08 10:22:07 -0800502 memblock_get_region_node(rgn));
Tejun Heo6a9ceb32011-12-08 10:22:07 -0800503 } else if (rend > end) {
504 /*
505 * @rgn intersects from above. Split and redo the
506 * current region - the new bottom half.
507 */
508 rgn->base = end;
Tejun Heo1440c4e2011-12-08 10:22:08 -0800509 rgn->size -= end - rbase;
510 type->total_size -= end - rbase;
Tejun Heo6a9ceb32011-12-08 10:22:07 -0800511 memblock_insert_region(type, i--, rbase, end - rbase,
Tejun Heo71936182011-12-08 10:22:07 -0800512 memblock_get_region_node(rgn));
Tejun Heo6a9ceb32011-12-08 10:22:07 -0800513 } else {
514 /* @rgn is fully contained, record it */
515 if (!*end_rgn)
516 *start_rgn = i;
517 *end_rgn = i + 1;
518 }
519 }
520
521 return 0;
522}
Tejun Heo6a9ceb32011-12-08 10:22:07 -0800523
Tejun Heo581adcb2011-12-08 10:22:06 -0800524static int __init_memblock __memblock_remove(struct memblock_type *type,
525 phys_addr_t base, phys_addr_t size)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000526{
Tejun Heo71936182011-12-08 10:22:07 -0800527 int start_rgn, end_rgn;
528 int i, ret;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000529
Tejun Heo71936182011-12-08 10:22:07 -0800530 ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
531 if (ret)
532 return ret;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000533
Tejun Heo71936182011-12-08 10:22:07 -0800534 for (i = end_rgn - 1; i >= start_rgn; i--)
535 memblock_remove_region(type, i);
Benjamin Herrenschmidt8f7a6602011-03-22 16:33:43 -0700536 return 0;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000537}
538
Tejun Heo581adcb2011-12-08 10:22:06 -0800539int __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000540{
541 return __memblock_remove(&memblock.memory, base, size);
542}
543
Tejun Heo581adcb2011-12-08 10:22:06 -0800544int __init_memblock memblock_free(phys_addr_t base, phys_addr_t size)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000545{
Tejun Heo24aa0782011-07-12 11:16:06 +0200546 memblock_dbg(" memblock_free: [%#016llx-%#016llx] %pF\n",
H. Peter Anvina1504392011-07-14 11:57:10 -0700547 (unsigned long long)base,
548 (unsigned long long)base + size,
549 (void *)_RET_IP_);
Tejun Heo24aa0782011-07-12 11:16:06 +0200550
Yinghai Lu95f72d12010-07-12 14:36:09 +1000551 return __memblock_remove(&memblock.reserved, base, size);
552}
553
Tejun Heo581adcb2011-12-08 10:22:06 -0800554int __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000555{
Benjamin Herrenschmidte3239ff2010-08-04 14:06:41 +1000556 struct memblock_type *_rgn = &memblock.reserved;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000557
Tejun Heo24aa0782011-07-12 11:16:06 +0200558 memblock_dbg("memblock_reserve: [%#016llx-%#016llx] %pF\n",
H. Peter Anvina1504392011-07-14 11:57:10 -0700559 (unsigned long long)base,
560 (unsigned long long)base + size,
561 (void *)_RET_IP_);
Yinghai Lu95f72d12010-07-12 14:36:09 +1000562
Tejun Heo7fb0bc32011-12-08 10:22:08 -0800563 return memblock_add_region(_rgn, base, size, MAX_NUMNODES);
Yinghai Lu95f72d12010-07-12 14:36:09 +1000564}
565
Tejun Heo35fd0802011-07-12 11:15:59 +0200566/**
567 * __next_free_mem_range - next function for for_each_free_mem_range()
568 * @idx: pointer to u64 loop variable
Tang Chend8bbdd72013-07-08 16:00:22 -0700569 * @nid: node selector, %MAX_NUMNODES for all nodes
Wanpeng Lidad75572012-06-20 12:53:01 -0700570 * @out_start: ptr to phys_addr_t for start address of the range, can be %NULL
571 * @out_end: ptr to phys_addr_t for end address of the range, can be %NULL
572 * @out_nid: ptr to int for nid of the range, can be %NULL
Tejun Heo35fd0802011-07-12 11:15:59 +0200573 *
574 * Find the first free area from *@idx which matches @nid, fill the out
575 * parameters, and update *@idx for the next iteration. The lower 32bit of
576 * *@idx contains index into memory region and the upper 32bit indexes the
577 * areas before each reserved region. For example, if reserved regions
578 * look like the following,
579 *
580 * 0:[0-16), 1:[32-48), 2:[128-130)
581 *
582 * The upper 32bit indexes the following regions.
583 *
584 * 0:[0-0), 1:[16-32), 2:[48-128), 3:[130-MAX)
585 *
586 * As both region arrays are sorted, the function advances the two indices
587 * in lockstep and returns each intersection.
588 */
589void __init_memblock __next_free_mem_range(u64 *idx, int nid,
590 phys_addr_t *out_start,
591 phys_addr_t *out_end, int *out_nid)
592{
593 struct memblock_type *mem = &memblock.memory;
594 struct memblock_type *rsv = &memblock.reserved;
595 int mi = *idx & 0xffffffff;
596 int ri = *idx >> 32;
597
598 for ( ; mi < mem->cnt; mi++) {
599 struct memblock_region *m = &mem->regions[mi];
600 phys_addr_t m_start = m->base;
601 phys_addr_t m_end = m->base + m->size;
602
603 /* only memory regions are associated with nodes, check it */
604 if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
605 continue;
606
607 /* scan areas before each reservation for intersection */
608 for ( ; ri < rsv->cnt + 1; ri++) {
609 struct memblock_region *r = &rsv->regions[ri];
610 phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0;
611 phys_addr_t r_end = ri < rsv->cnt ? r->base : ULLONG_MAX;
612
613 /* if ri advanced past mi, break out to advance mi */
614 if (r_start >= m_end)
615 break;
616 /* if the two regions intersect, we're done */
617 if (m_start < r_end) {
618 if (out_start)
619 *out_start = max(m_start, r_start);
620 if (out_end)
621 *out_end = min(m_end, r_end);
622 if (out_nid)
623 *out_nid = memblock_get_region_node(m);
624 /*
625 * The region which ends first is advanced
626 * for the next iteration.
627 */
628 if (m_end <= r_end)
629 mi++;
630 else
631 ri++;
632 *idx = (u32)mi | (u64)ri << 32;
633 return;
634 }
635 }
636 }
637
638 /* signal end of iteration */
639 *idx = ULLONG_MAX;
640}
641
Tejun Heo7bd0b0f2011-12-08 10:22:09 -0800642/**
643 * __next_free_mem_range_rev - next function for for_each_free_mem_range_reverse()
644 * @idx: pointer to u64 loop variable
645 * @nid: nid: node selector, %MAX_NUMNODES for all nodes
Wanpeng Lidad75572012-06-20 12:53:01 -0700646 * @out_start: ptr to phys_addr_t for start address of the range, can be %NULL
647 * @out_end: ptr to phys_addr_t for end address of the range, can be %NULL
648 * @out_nid: ptr to int for nid of the range, can be %NULL
Tejun Heo7bd0b0f2011-12-08 10:22:09 -0800649 *
650 * Reverse of __next_free_mem_range().
651 */
652void __init_memblock __next_free_mem_range_rev(u64 *idx, int nid,
653 phys_addr_t *out_start,
654 phys_addr_t *out_end, int *out_nid)
655{
656 struct memblock_type *mem = &memblock.memory;
657 struct memblock_type *rsv = &memblock.reserved;
658 int mi = *idx & 0xffffffff;
659 int ri = *idx >> 32;
660
661 if (*idx == (u64)ULLONG_MAX) {
662 mi = mem->cnt - 1;
663 ri = rsv->cnt;
664 }
665
666 for ( ; mi >= 0; mi--) {
667 struct memblock_region *m = &mem->regions[mi];
668 phys_addr_t m_start = m->base;
669 phys_addr_t m_end = m->base + m->size;
670
671 /* only memory regions are associated with nodes, check it */
672 if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
673 continue;
674
675 /* scan areas before each reservation for intersection */
676 for ( ; ri >= 0; ri--) {
677 struct memblock_region *r = &rsv->regions[ri];
678 phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0;
679 phys_addr_t r_end = ri < rsv->cnt ? r->base : ULLONG_MAX;
680
681 /* if ri advanced past mi, break out to advance mi */
682 if (r_end <= m_start)
683 break;
684 /* if the two regions intersect, we're done */
685 if (m_end > r_start) {
686 if (out_start)
687 *out_start = max(m_start, r_start);
688 if (out_end)
689 *out_end = min(m_end, r_end);
690 if (out_nid)
691 *out_nid = memblock_get_region_node(m);
692
693 if (m_start >= r_start)
694 mi--;
695 else
696 ri--;
697 *idx = (u32)mi | (u64)ri << 32;
698 return;
699 }
700 }
701 }
702
703 *idx = ULLONG_MAX;
704}
705
Tejun Heo7c0caeb2011-07-14 11:43:42 +0200706#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
707/*
708 * Common iterator interface used to define for_each_mem_range().
709 */
710void __init_memblock __next_mem_pfn_range(int *idx, int nid,
711 unsigned long *out_start_pfn,
712 unsigned long *out_end_pfn, int *out_nid)
713{
714 struct memblock_type *type = &memblock.memory;
715 struct memblock_region *r;
716
717 while (++*idx < type->cnt) {
718 r = &type->regions[*idx];
719
720 if (PFN_UP(r->base) >= PFN_DOWN(r->base + r->size))
721 continue;
722 if (nid == MAX_NUMNODES || nid == r->nid)
723 break;
724 }
725 if (*idx >= type->cnt) {
726 *idx = -1;
727 return;
728 }
729
730 if (out_start_pfn)
731 *out_start_pfn = PFN_UP(r->base);
732 if (out_end_pfn)
733 *out_end_pfn = PFN_DOWN(r->base + r->size);
734 if (out_nid)
735 *out_nid = r->nid;
736}
737
738/**
739 * memblock_set_node - set node ID on memblock regions
740 * @base: base of area to set node ID for
741 * @size: size of area to set node ID for
742 * @nid: node ID to set
743 *
744 * Set the nid of memblock memory regions in [@base,@base+@size) to @nid.
745 * Regions which cross the area boundaries are split as necessary.
746 *
747 * RETURNS:
748 * 0 on success, -errno on failure.
749 */
750int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size,
751 int nid)
752{
753 struct memblock_type *type = &memblock.memory;
Tejun Heo6a9ceb32011-12-08 10:22:07 -0800754 int start_rgn, end_rgn;
755 int i, ret;
Tejun Heo7c0caeb2011-07-14 11:43:42 +0200756
Tejun Heo6a9ceb32011-12-08 10:22:07 -0800757 ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
758 if (ret)
759 return ret;
Tejun Heo7c0caeb2011-07-14 11:43:42 +0200760
Tejun Heo6a9ceb32011-12-08 10:22:07 -0800761 for (i = start_rgn; i < end_rgn; i++)
Wanpeng Lie9d24ad2012-10-08 16:32:21 -0700762 memblock_set_region_node(&type->regions[i], nid);
Tejun Heo7c0caeb2011-07-14 11:43:42 +0200763
764 memblock_merge_regions(type);
765 return 0;
766}
767#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
768
Tejun Heo7bd0b0f2011-12-08 10:22:09 -0800769static phys_addr_t __init memblock_alloc_base_nid(phys_addr_t size,
770 phys_addr_t align, phys_addr_t max_addr,
771 int nid)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000772{
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +1000773 phys_addr_t found;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000774
Vineet Gupta94f3d3a2013-04-29 15:06:15 -0700775 if (WARN_ON(!align))
776 align = __alignof__(long long);
777
Tejun Heo847854f2012-02-29 05:56:21 +0900778 /* align @size to avoid excessive fragmentation on reserved array */
779 size = round_up(size, align);
780
Tejun Heo7bd0b0f2011-12-08 10:22:09 -0800781 found = memblock_find_in_range_node(0, max_addr, size, align, nid);
Tejun Heo9c8c27e2011-12-08 10:22:06 -0800782 if (found && !memblock_reserve(found, size))
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +1000783 return found;
784
785 return 0;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000786}
787
Tejun Heo7bd0b0f2011-12-08 10:22:09 -0800788phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid)
789{
790 return memblock_alloc_base_nid(size, align, MEMBLOCK_ALLOC_ACCESSIBLE, nid);
791}
792
793phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
794{
795 return memblock_alloc_base_nid(size, align, max_addr, MAX_NUMNODES);
796}
797
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +1000798phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000799{
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +1000800 phys_addr_t alloc;
801
802 alloc = __memblock_alloc_base(size, align, max_addr);
803
804 if (alloc == 0)
805 panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n",
806 (unsigned long long) size, (unsigned long long) max_addr);
807
808 return alloc;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000809}
810
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +1000811phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000812{
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +1000813 return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
Yinghai Lu95f72d12010-07-12 14:36:09 +1000814}
815
Benjamin Herrenschmidt9d1e2492010-07-06 15:39:17 -0700816phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid)
817{
818 phys_addr_t res = memblock_alloc_nid(size, align, nid);
819
820 if (res)
821 return res;
Tejun Heo15fb0972011-07-12 09:58:07 +0200822 return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
Yinghai Lu95f72d12010-07-12 14:36:09 +1000823}
824
Benjamin Herrenschmidt9d1e2492010-07-06 15:39:17 -0700825
826/*
827 * Remaining API functions
828 */
829
Benjamin Herrenschmidt2898cc42010-08-04 13:34:42 +1000830phys_addr_t __init memblock_phys_mem_size(void)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000831{
Tejun Heo1440c4e2011-12-08 10:22:08 -0800832 return memblock.memory.total_size;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000833}
834
Yinghai Lu595ad9a2013-01-24 12:20:09 -0800835phys_addr_t __init memblock_mem_size(unsigned long limit_pfn)
836{
837 unsigned long pages = 0;
838 struct memblock_region *r;
839 unsigned long start_pfn, end_pfn;
840
841 for_each_memblock(memory, r) {
842 start_pfn = memblock_region_memory_base_pfn(r);
843 end_pfn = memblock_region_memory_end_pfn(r);
844 start_pfn = min_t(unsigned long, start_pfn, limit_pfn);
845 end_pfn = min_t(unsigned long, end_pfn, limit_pfn);
846 pages += end_pfn - start_pfn;
847 }
848
849 return (phys_addr_t)pages << PAGE_SHIFT;
850}
851
Sam Ravnborg0a93ebe2011-10-31 17:08:16 -0700852/* lowest address */
853phys_addr_t __init_memblock memblock_start_of_DRAM(void)
854{
855 return memblock.memory.regions[0].base;
856}
857
Yinghai Lu10d06432010-07-28 15:43:02 +1000858phys_addr_t __init_memblock memblock_end_of_DRAM(void)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000859{
860 int idx = memblock.memory.cnt - 1;
861
Benjamin Herrenschmidte3239ff2010-08-04 14:06:41 +1000862 return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size);
Yinghai Lu95f72d12010-07-12 14:36:09 +1000863}
864
Tejun Heoc0ce8fe2011-12-08 10:22:07 -0800865void __init memblock_enforce_memory_limit(phys_addr_t limit)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000866{
867 unsigned long i;
Tejun Heoc0ce8fe2011-12-08 10:22:07 -0800868 phys_addr_t max_addr = (phys_addr_t)ULLONG_MAX;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000869
Tejun Heoc0ce8fe2011-12-08 10:22:07 -0800870 if (!limit)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000871 return;
872
Tejun Heoc0ce8fe2011-12-08 10:22:07 -0800873 /* find out max address */
Yinghai Lu95f72d12010-07-12 14:36:09 +1000874 for (i = 0; i < memblock.memory.cnt; i++) {
Tejun Heoc0ce8fe2011-12-08 10:22:07 -0800875 struct memblock_region *r = &memblock.memory.regions[i];
Yinghai Lu95f72d12010-07-12 14:36:09 +1000876
Tejun Heoc0ce8fe2011-12-08 10:22:07 -0800877 if (limit <= r->size) {
878 max_addr = r->base + limit;
879 break;
880 }
881 limit -= r->size;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000882 }
883
Tejun Heoc0ce8fe2011-12-08 10:22:07 -0800884 /* truncate both memory and reserved regions */
885 __memblock_remove(&memblock.memory, max_addr, (phys_addr_t)ULLONG_MAX);
886 __memblock_remove(&memblock.reserved, max_addr, (phys_addr_t)ULLONG_MAX);
Yinghai Lu95f72d12010-07-12 14:36:09 +1000887}
888
Yinghai Lucd794812010-10-11 12:34:09 -0700889static int __init_memblock memblock_search(struct memblock_type *type, phys_addr_t addr)
Benjamin Herrenschmidt72d4b0b2010-08-04 14:38:47 +1000890{
891 unsigned int left = 0, right = type->cnt;
892
893 do {
894 unsigned int mid = (right + left) / 2;
895
896 if (addr < type->regions[mid].base)
897 right = mid;
898 else if (addr >= (type->regions[mid].base +
899 type->regions[mid].size))
900 left = mid + 1;
901 else
902 return mid;
903 } while (left < right);
904 return -1;
905}
906
Benjamin Herrenschmidt2898cc42010-08-04 13:34:42 +1000907int __init memblock_is_reserved(phys_addr_t addr)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000908{
Benjamin Herrenschmidt72d4b0b2010-08-04 14:38:47 +1000909 return memblock_search(&memblock.reserved, addr) != -1;
910}
Yinghai Lu95f72d12010-07-12 14:36:09 +1000911
Yinghai Lu3661ca62010-09-15 13:05:29 -0700912int __init_memblock memblock_is_memory(phys_addr_t addr)
Benjamin Herrenschmidt72d4b0b2010-08-04 14:38:47 +1000913{
914 return memblock_search(&memblock.memory, addr) != -1;
915}
916
Stephen Boydeab30942012-05-24 00:45:21 -0700917/**
918 * memblock_is_region_memory - check if a region is a subset of memory
919 * @base: base of region to check
920 * @size: size of region to check
921 *
922 * Check if the region [@base, @base+@size) is a subset of a memory block.
923 *
924 * RETURNS:
925 * 0 if false, non-zero if true
926 */
Yinghai Lu3661ca62010-09-15 13:05:29 -0700927int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size)
Benjamin Herrenschmidt72d4b0b2010-08-04 14:38:47 +1000928{
Tomi Valkeinenabb65272011-01-20 14:44:20 -0800929 int idx = memblock_search(&memblock.memory, base);
Tejun Heoeb18f1b2011-12-08 10:22:07 -0800930 phys_addr_t end = base + memblock_cap_size(base, &size);
Benjamin Herrenschmidt72d4b0b2010-08-04 14:38:47 +1000931
932 if (idx == -1)
933 return 0;
Tomi Valkeinenabb65272011-01-20 14:44:20 -0800934 return memblock.memory.regions[idx].base <= base &&
935 (memblock.memory.regions[idx].base +
Tejun Heoeb18f1b2011-12-08 10:22:07 -0800936 memblock.memory.regions[idx].size) >= end;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000937}
938
Stephen Boydeab30942012-05-24 00:45:21 -0700939/**
940 * memblock_is_region_reserved - check if a region intersects reserved memory
941 * @base: base of region to check
942 * @size: size of region to check
943 *
944 * Check if the region [@base, @base+@size) intersects a reserved memory block.
945 *
946 * RETURNS:
947 * 0 if false, non-zero if true
948 */
Yinghai Lu10d06432010-07-28 15:43:02 +1000949int __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000950{
Tejun Heoeb18f1b2011-12-08 10:22:07 -0800951 memblock_cap_size(base, &size);
Benjamin Herrenschmidtf1c2c192010-08-04 14:17:17 +1000952 return memblock_overlaps_region(&memblock.reserved, base, size) >= 0;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000953}
954
Yinghai Lu6ede1fd2012-10-22 16:35:18 -0700955void __init_memblock memblock_trim_memory(phys_addr_t align)
956{
957 int i;
958 phys_addr_t start, end, orig_start, orig_end;
959 struct memblock_type *mem = &memblock.memory;
960
961 for (i = 0; i < mem->cnt; i++) {
962 orig_start = mem->regions[i].base;
963 orig_end = mem->regions[i].base + mem->regions[i].size;
964 start = round_up(orig_start, align);
965 end = round_down(orig_end, align);
966
967 if (start == orig_start && end == orig_end)
968 continue;
969
970 if (start < end) {
971 mem->regions[i].base = start;
972 mem->regions[i].size = end - start;
973 } else {
974 memblock_remove_region(mem, i);
975 i--;
976 }
977 }
978}
Benjamin Herrenschmidte63075a2010-07-06 15:39:01 -0700979
Yinghai Lu3661ca62010-09-15 13:05:29 -0700980void __init_memblock memblock_set_current_limit(phys_addr_t limit)
Benjamin Herrenschmidte63075a2010-07-06 15:39:01 -0700981{
982 memblock.current_limit = limit;
983}
984
Tejun Heo7c0caeb2011-07-14 11:43:42 +0200985static void __init_memblock memblock_dump(struct memblock_type *type, char *name)
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +1000986{
987 unsigned long long base, size;
988 int i;
989
Tejun Heo7c0caeb2011-07-14 11:43:42 +0200990 pr_info(" %s.cnt = 0x%lx\n", name, type->cnt);
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +1000991
Tejun Heo7c0caeb2011-07-14 11:43:42 +0200992 for (i = 0; i < type->cnt; i++) {
993 struct memblock_region *rgn = &type->regions[i];
994 char nid_buf[32] = "";
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +1000995
Tejun Heo7c0caeb2011-07-14 11:43:42 +0200996 base = rgn->base;
997 size = rgn->size;
998#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
999 if (memblock_get_region_node(rgn) != MAX_NUMNODES)
1000 snprintf(nid_buf, sizeof(nid_buf), " on node %d",
1001 memblock_get_region_node(rgn));
1002#endif
1003 pr_info(" %s[%#x]\t[%#016llx-%#016llx], %#llx bytes%s\n",
1004 name, i, base, base + size - 1, size, nid_buf);
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +10001005 }
1006}
1007
Tejun Heo4ff7b822011-12-08 10:22:06 -08001008void __init_memblock __memblock_dump_all(void)
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +10001009{
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +10001010 pr_info("MEMBLOCK configuration:\n");
Tejun Heo1440c4e2011-12-08 10:22:08 -08001011 pr_info(" memory size = %#llx reserved size = %#llx\n",
1012 (unsigned long long)memblock.memory.total_size,
1013 (unsigned long long)memblock.reserved.total_size);
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +10001014
1015 memblock_dump(&memblock.memory, "memory");
1016 memblock_dump(&memblock.reserved, "reserved");
1017}
1018
Tejun Heo1aadc052011-12-08 10:22:08 -08001019void __init memblock_allow_resize(void)
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +10001020{
Benjamin Herrenschmidt142b45a2010-07-06 15:39:13 -07001021 memblock_can_resize = 1;
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +10001022}
1023
Benjamin Herrenschmidt6ed311b2010-07-12 14:36:48 +10001024static int __init early_memblock(char *p)
1025{
1026 if (p && strstr(p, "debug"))
1027 memblock_debug = 1;
1028 return 0;
1029}
1030early_param("memblock", early_memblock);
1031
Tejun Heoc378ddd2011-07-14 11:46:03 +02001032#if defined(CONFIG_DEBUG_FS) && !defined(CONFIG_ARCH_DISCARD_MEMBLOCK)
Benjamin Herrenschmidt6d03b882010-07-06 15:39:19 -07001033
1034static int memblock_debug_show(struct seq_file *m, void *private)
1035{
1036 struct memblock_type *type = m->private;
1037 struct memblock_region *reg;
1038 int i;
1039
1040 for (i = 0; i < type->cnt; i++) {
1041 reg = &type->regions[i];
1042 seq_printf(m, "%4d: ", i);
1043 if (sizeof(phys_addr_t) == 4)
1044 seq_printf(m, "0x%08lx..0x%08lx\n",
1045 (unsigned long)reg->base,
1046 (unsigned long)(reg->base + reg->size - 1));
1047 else
1048 seq_printf(m, "0x%016llx..0x%016llx\n",
1049 (unsigned long long)reg->base,
1050 (unsigned long long)(reg->base + reg->size - 1));
1051
1052 }
1053 return 0;
1054}
1055
1056static int memblock_debug_open(struct inode *inode, struct file *file)
1057{
1058 return single_open(file, memblock_debug_show, inode->i_private);
1059}
1060
1061static const struct file_operations memblock_debug_fops = {
1062 .open = memblock_debug_open,
1063 .read = seq_read,
1064 .llseek = seq_lseek,
1065 .release = single_release,
1066};
1067
1068static int __init memblock_init_debugfs(void)
1069{
1070 struct dentry *root = debugfs_create_dir("memblock", NULL);
1071 if (!root)
1072 return -ENXIO;
1073 debugfs_create_file("memory", S_IRUGO, root, &memblock.memory, &memblock_debug_fops);
1074 debugfs_create_file("reserved", S_IRUGO, root, &memblock.reserved, &memblock_debug_fops);
1075
1076 return 0;
1077}
1078__initcall(memblock_init_debugfs);
1079
1080#endif /* CONFIG_DEBUG_FS */