Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
09325873 YL |
2 | /* |
3 | * bootmem - A boot-time physical memory allocator and configurator | |
4 | * | |
5 | * Copyright (C) 1999 Ingo Molnar | |
6 | * 1999 Kanoj Sarcar, SGI | |
7 | * 2008 Johannes Weiner | |
8 | * | |
9 | * Access to this subsystem has to be serialized externally (which is true | |
10 | * for the boot process anyway). | |
11 | */ | |
12 | #include <linux/init.h> | |
13 | #include <linux/pfn.h> | |
14 | #include <linux/slab.h> | |
b95f1b31 | 15 | #include <linux/export.h> |
09325873 YL |
16 | #include <linux/kmemleak.h> |
17 | #include <linux/range.h> | |
18 | #include <linux/memblock.h> | |
2382705f | 19 | #include <linux/bootmem.h> |
09325873 YL |
20 | |
21 | #include <asm/bug.h> | |
22 | #include <asm/io.h> | |
09325873 YL |
23 | |
24 | #include "internal.h" | |
25 | ||
e782ab42 YL |
26 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
27 | struct pglist_data __refdata contig_page_data; | |
28 | EXPORT_SYMBOL(contig_page_data); | |
29 | #endif | |
30 | ||
09325873 YL |
31 | unsigned long max_low_pfn; |
32 | unsigned long min_low_pfn; | |
33 | unsigned long max_pfn; | |
8dd33030 | 34 | unsigned long long max_possible_pfn; |
09325873 | 35 | |
8bc1f91e YL |
36 | static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align, |
37 | u64 goal, u64 limit) | |
38 | { | |
39 | void *ptr; | |
40 | u64 addr; | |
e1720fee | 41 | enum memblock_flags flags = choose_memblock_flags(); |
8bc1f91e YL |
42 | |
43 | if (limit > memblock.current_limit) | |
44 | limit = memblock.current_limit; | |
45 | ||
a3f5bafc | 46 | again: |
fc6daaf9 | 47 | addr = memblock_find_in_range_node(size, align, goal, limit, nid, |
a3f5bafc TL |
48 | flags); |
49 | if (!addr && (flags & MEMBLOCK_MIRROR)) { | |
50 | flags &= ~MEMBLOCK_MIRROR; | |
51 | pr_warn("Could not allocate %pap bytes of mirrored memory\n", | |
52 | &size); | |
53 | goto again; | |
54 | } | |
1f5026a7 | 55 | if (!addr) |
8bc1f91e YL |
56 | return NULL; |
57 | ||
87379ec8 PH |
58 | if (memblock_reserve(addr, size)) |
59 | return NULL; | |
60 | ||
8bc1f91e YL |
61 | ptr = phys_to_virt(addr); |
62 | memset(ptr, 0, size); | |
8bc1f91e YL |
63 | /* |
64 | * The min_count is set to 0 so that bootmem allocated blocks | |
65 | * are never reported as leaks. | |
66 | */ | |
67 | kmemleak_alloc(ptr, size, 0, 0); | |
68 | return ptr; | |
69 | } | |
70 | ||
8108ad51 | 71 | /** |
09325873 YL |
72 | * free_bootmem_late - free bootmem pages directly to page allocator |
73 | * @addr: starting address of the range | |
74 | * @size: size of the range in bytes | |
75 | * | |
76 | * This is only useful when the bootmem allocator has already been torn | |
77 | * down, but we are still initializing the system. Pages are given directly | |
78 | * to the page allocator, no bootmem metadata is updated because it is gone. | |
79 | */ | |
80 | void __init free_bootmem_late(unsigned long addr, unsigned long size) | |
81 | { | |
82 | unsigned long cursor, end; | |
83 | ||
9099daed | 84 | kmemleak_free_part_phys(addr, size); |
09325873 YL |
85 | |
86 | cursor = PFN_UP(addr); | |
87 | end = PFN_DOWN(addr + size); | |
88 | ||
89 | for (; cursor < end; cursor++) { | |
d70ddd7a | 90 | __free_pages_bootmem(pfn_to_page(cursor), cursor, 0); |
09325873 YL |
91 | totalram_pages++; |
92 | } | |
93 | } | |
94 | ||
95 | static void __init __free_pages_memory(unsigned long start, unsigned long end) | |
96 | { | |
309d0b39 | 97 | int order; |
09325873 | 98 | |
309d0b39 RH |
99 | while (start < end) { |
100 | order = min(MAX_ORDER - 1UL, __ffs(start)); | |
09325873 | 101 | |
309d0b39 RH |
102 | while (start + (1UL << order) > end) |
103 | order--; | |
09325873 | 104 | |
d70ddd7a | 105 | __free_pages_bootmem(pfn_to_page(start), start, order); |
09325873 | 106 | |
309d0b39 RH |
107 | start += (1UL << order); |
108 | } | |
09325873 YL |
109 | } |
110 | ||
29f67386 YL |
111 | static unsigned long __init __free_memory_core(phys_addr_t start, |
112 | phys_addr_t end) | |
113 | { | |
114 | unsigned long start_pfn = PFN_UP(start); | |
115 | unsigned long end_pfn = min_t(unsigned long, | |
116 | PFN_DOWN(end), max_low_pfn); | |
117 | ||
172ffeb9 | 118 | if (start_pfn >= end_pfn) |
29f67386 YL |
119 | return 0; |
120 | ||
121 | __free_pages_memory(start_pfn, end_pfn); | |
122 | ||
123 | return end_pfn - start_pfn; | |
124 | } | |
125 | ||
b4def350 | 126 | static unsigned long __init free_low_memory_core_early(void) |
09325873 | 127 | { |
09325873 | 128 | unsigned long count = 0; |
354f17e1 | 129 | phys_addr_t start, end; |
8a9ca34c TH |
130 | u64 i; |
131 | ||
0a313a99 XQ |
132 | memblock_clear_hotplug(0, -1); |
133 | ||
92923ca3 NZ |
134 | for_each_reserved_mem_region(i, &start, &end) |
135 | reserve_bootmem_region(start, end); | |
136 | ||
914a0516 WG |
137 | /* |
138 | * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id | |
139 | * because in some case like Node0 doesn't have RAM installed | |
140 | * low ram will be on Node1 | |
141 | */ | |
fc6daaf9 TL |
142 | for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end, |
143 | NULL) | |
29f67386 YL |
144 | count += __free_memory_core(start, end); |
145 | ||
09325873 YL |
146 | return count; |
147 | } | |
148 | ||
7b4b2a0d JL |
149 | static int reset_managed_pages_done __initdata; |
150 | ||
f784a3f1 | 151 | void reset_node_managed_pages(pg_data_t *pgdat) |
9feedc9d JL |
152 | { |
153 | struct zone *z; | |
154 | ||
9feedc9d | 155 | for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) |
7b4b2a0d JL |
156 | z->managed_pages = 0; |
157 | } | |
158 | ||
159 | void __init reset_all_zones_managed_pages(void) | |
160 | { | |
161 | struct pglist_data *pgdat; | |
162 | ||
f784a3f1 TC |
163 | if (reset_managed_pages_done) |
164 | return; | |
165 | ||
7b4b2a0d JL |
166 | for_each_online_pgdat(pgdat) |
167 | reset_node_managed_pages(pgdat); | |
f784a3f1 | 168 | |
7b4b2a0d | 169 | reset_managed_pages_done = 1; |
9feedc9d JL |
170 | } |
171 | ||
09325873 YL |
172 | /** |
173 | * free_all_bootmem - release free pages to the buddy allocator | |
174 | * | |
8108ad51 | 175 | * Return: the number of pages actually released. |
09325873 YL |
176 | */ |
177 | unsigned long __init free_all_bootmem(void) | |
178 | { | |
0c988534 JL |
179 | unsigned long pages; |
180 | ||
7b4b2a0d | 181 | reset_all_zones_managed_pages(); |
9feedc9d | 182 | |
0c988534 JL |
183 | pages = free_low_memory_core_early(); |
184 | totalram_pages += pages; | |
185 | ||
186 | return pages; | |
09325873 YL |
187 | } |
188 | ||
189 | /** | |
190 | * free_bootmem_node - mark a page range as usable | |
191 | * @pgdat: node the range resides on | |
8108ad51 | 192 | * @physaddr: starting physical address of the range |
09325873 YL |
193 | * @size: size of the range in bytes |
194 | * | |
195 | * Partial pages will be considered reserved and left as they are. | |
196 | * | |
197 | * The range must reside completely on the specified node. | |
198 | */ | |
199 | void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, | |
200 | unsigned long size) | |
201 | { | |
24aa0788 | 202 | memblock_free(physaddr, size); |
09325873 YL |
203 | } |
204 | ||
205 | /** | |
206 | * free_bootmem - mark a page range as usable | |
8108ad51 | 207 | * @addr: starting physical address of the range |
09325873 YL |
208 | * @size: size of the range in bytes |
209 | * | |
210 | * Partial pages will be considered reserved and left as they are. | |
211 | * | |
212 | * The range must be contiguous but may span node boundaries. | |
213 | */ | |
214 | void __init free_bootmem(unsigned long addr, unsigned long size) | |
215 | { | |
24aa0788 | 216 | memblock_free(addr, size); |
09325873 YL |
217 | } |
218 | ||
219 | static void * __init ___alloc_bootmem_nopanic(unsigned long size, | |
220 | unsigned long align, | |
221 | unsigned long goal, | |
222 | unsigned long limit) | |
223 | { | |
224 | void *ptr; | |
225 | ||
226 | if (WARN_ON_ONCE(slab_is_available())) | |
227 | return kzalloc(size, GFP_NOWAIT); | |
228 | ||
229 | restart: | |
230 | ||
b1154233 | 231 | ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit); |
09325873 YL |
232 | |
233 | if (ptr) | |
234 | return ptr; | |
235 | ||
236 | if (goal != 0) { | |
237 | goal = 0; | |
238 | goto restart; | |
239 | } | |
240 | ||
241 | return NULL; | |
242 | } | |
243 | ||
244 | /** | |
245 | * __alloc_bootmem_nopanic - allocate boot memory without panicking | |
246 | * @size: size of the request in bytes | |
247 | * @align: alignment of the region | |
248 | * @goal: preferred starting address of the region | |
249 | * | |
250 | * The goal is dropped if it can not be satisfied and the allocation will | |
251 | * fall back to memory below @goal. | |
252 | * | |
253 | * Allocation may happen on any node in the system. | |
254 | * | |
8108ad51 | 255 | * Return: address of the allocated region or %NULL on failure. |
09325873 YL |
256 | */ |
257 | void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align, | |
258 | unsigned long goal) | |
259 | { | |
260 | unsigned long limit = -1UL; | |
261 | ||
262 | return ___alloc_bootmem_nopanic(size, align, goal, limit); | |
263 | } | |
264 | ||
265 | static void * __init ___alloc_bootmem(unsigned long size, unsigned long align, | |
266 | unsigned long goal, unsigned long limit) | |
267 | { | |
268 | void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit); | |
269 | ||
270 | if (mem) | |
271 | return mem; | |
272 | /* | |
273 | * Whoops, we cannot satisfy the allocation request. | |
274 | */ | |
1170532b | 275 | pr_alert("bootmem alloc of %lu bytes failed!\n", size); |
09325873 YL |
276 | panic("Out of memory"); |
277 | return NULL; | |
278 | } | |
279 | ||
280 | /** | |
281 | * __alloc_bootmem - allocate boot memory | |
282 | * @size: size of the request in bytes | |
283 | * @align: alignment of the region | |
284 | * @goal: preferred starting address of the region | |
285 | * | |
286 | * The goal is dropped if it can not be satisfied and the allocation will | |
287 | * fall back to memory below @goal. | |
288 | * | |
289 | * Allocation may happen on any node in the system. | |
290 | * | |
291 | * The function panics if the request can not be satisfied. | |
8108ad51 MR |
292 | * |
293 | * Return: address of the allocated region. | |
09325873 YL |
294 | */ |
295 | void * __init __alloc_bootmem(unsigned long size, unsigned long align, | |
296 | unsigned long goal) | |
297 | { | |
298 | unsigned long limit = -1UL; | |
299 | ||
300 | return ___alloc_bootmem(size, align, goal, limit); | |
301 | } | |
302 | ||
99ab7b19 | 303 | void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat, |
ba539868 JW |
304 | unsigned long size, |
305 | unsigned long align, | |
306 | unsigned long goal, | |
307 | unsigned long limit) | |
308 | { | |
309 | void *ptr; | |
310 | ||
311 | again: | |
312 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, | |
313 | goal, limit); | |
314 | if (ptr) | |
315 | return ptr; | |
316 | ||
b1154233 | 317 | ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, |
ba539868 JW |
318 | goal, limit); |
319 | if (ptr) | |
320 | return ptr; | |
321 | ||
322 | if (goal) { | |
323 | goal = 0; | |
324 | goto again; | |
325 | } | |
326 | ||
327 | return NULL; | |
328 | } | |
329 | ||
330 | void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size, | |
331 | unsigned long align, unsigned long goal) | |
332 | { | |
333 | if (WARN_ON_ONCE(slab_is_available())) | |
334 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); | |
335 | ||
336 | return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0); | |
337 | } | |
338 | ||
de498507 | 339 | static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, |
ba539868 JW |
340 | unsigned long align, unsigned long goal, |
341 | unsigned long limit) | |
342 | { | |
343 | void *ptr; | |
344 | ||
345 | ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit); | |
346 | if (ptr) | |
347 | return ptr; | |
348 | ||
1170532b | 349 | pr_alert("bootmem alloc of %lu bytes failed!\n", size); |
ba539868 JW |
350 | panic("Out of memory"); |
351 | return NULL; | |
352 | } | |
353 | ||
09325873 YL |
354 | /** |
355 | * __alloc_bootmem_node - allocate boot memory from a specific node | |
356 | * @pgdat: node to allocate from | |
357 | * @size: size of the request in bytes | |
358 | * @align: alignment of the region | |
359 | * @goal: preferred starting address of the region | |
360 | * | |
361 | * The goal is dropped if it can not be satisfied and the allocation will | |
362 | * fall back to memory below @goal. | |
363 | * | |
364 | * Allocation may fall back to any node in the system if the specified node | |
365 | * can not hold the requested memory. | |
366 | * | |
367 | * The function panics if the request can not be satisfied. | |
8108ad51 MR |
368 | * |
369 | * Return: address of the allocated region. | |
09325873 YL |
370 | */ |
371 | void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, | |
372 | unsigned long align, unsigned long goal) | |
373 | { | |
09325873 YL |
374 | if (WARN_ON_ONCE(slab_is_available())) |
375 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); | |
376 | ||
ba539868 | 377 | return ___alloc_bootmem_node(pgdat, size, align, goal, 0); |
09325873 YL |
378 | } |
379 | ||
380 | void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size, | |
381 | unsigned long align, unsigned long goal) | |
382 | { | |
09325873 | 383 | return __alloc_bootmem_node(pgdat, size, align, goal); |
09325873 YL |
384 | } |
385 | ||
09325873 YL |
386 | |
387 | /** | |
388 | * __alloc_bootmem_low - allocate low boot memory | |
389 | * @size: size of the request in bytes | |
390 | * @align: alignment of the region | |
391 | * @goal: preferred starting address of the region | |
392 | * | |
393 | * The goal is dropped if it can not be satisfied and the allocation will | |
394 | * fall back to memory below @goal. | |
395 | * | |
396 | * Allocation may happen on any node in the system. | |
397 | * | |
398 | * The function panics if the request can not be satisfied. | |
8108ad51 MR |
399 | * |
400 | * Return: address of the allocated region. | |
09325873 YL |
401 | */ |
402 | void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, | |
403 | unsigned long goal) | |
404 | { | |
405 | return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT); | |
406 | } |