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1 | /* |
2 | * bootmem - A boot-time physical memory allocator and configurator |
3 | * |
4 | * Copyright (C) 1999 Ingo Molnar |
5 | * 1999 Kanoj Sarcar, SGI |
6 | * 2008 Johannes Weiner |
7 | * |
8 | * Access to this subsystem has to be serialized externally (which is true |
9 | * for the boot process anyway). |
10 | */ |
11 | #include <linux/init.h> |
12 | #include <linux/pfn.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/bootmem.h> |
15 | #include <linux/export.h> |
16 | #include <linux/kmemleak.h> |
17 | #include <linux/range.h> |
18 | #include <linux/memblock.h> |
19 | |
20 | #include <asm/bug.h> |
21 | #include <asm/io.h> |
22 | #include <asm/processor.h> |
23 | |
24 | #include "internal.h" |
25 | |
26 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
27 | struct pglist_data __refdata contig_page_data = { |
28 | .bdata = &bootmem_node_data[0] |
29 | }; |
30 | EXPORT_SYMBOL(contig_page_data); |
31 | #endif |
32 | |
33 | unsigned long max_low_pfn; |
34 | unsigned long min_low_pfn; |
35 | unsigned long max_pfn; |
36 | |
37 | bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata; |
38 | |
39 | static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list); |
40 | |
41 | static int bootmem_debug; |
42 | |
43 | static int __init bootmem_debug_setup(char *buf) |
44 | { |
45 | bootmem_debug = 1; |
46 | return 0; |
47 | } |
48 | early_param("bootmem_debug", bootmem_debug_setup); |
49 | |
50 | #define bdebug(fmt, args...) ({ \ |
51 | if (unlikely(bootmem_debug)) \ |
52 | printk(KERN_INFO \ |
53 | "bootmem::%s " fmt, \ |
54 | __func__, ## args); \ |
55 | }) |
56 | |
57 | static unsigned long __init bootmap_bytes(unsigned long pages) |
58 | { |
59 | unsigned long bytes = (pages + 7) / 8; |
60 | |
61 | return ALIGN(bytes, sizeof(long)); |
62 | } |
63 | |
64 | /** |
65 | * bootmem_bootmap_pages - calculate bitmap size in pages |
66 | * @pages: number of pages the bitmap has to represent |
67 | */ |
68 | unsigned long __init bootmem_bootmap_pages(unsigned long pages) |
69 | { |
70 | unsigned long bytes = bootmap_bytes(pages); |
71 | |
72 | return PAGE_ALIGN(bytes) >> PAGE_SHIFT; |
73 | } |
74 | |
75 | /* |
76 | * link bdata in order |
77 | */ |
78 | static void __init link_bootmem(bootmem_data_t *bdata) |
79 | { |
80 | struct list_head *iter; |
81 | |
82 | list_for_each(iter, &bdata_list) { |
83 | bootmem_data_t *ent; |
84 | |
85 | ent = list_entry(iter, bootmem_data_t, list); |
86 | if (bdata->node_min_pfn < ent->node_min_pfn) |
87 | break; |
88 | } |
89 | list_add_tail(&bdata->list, iter); |
90 | } |
91 | |
92 | /* |
93 | * Called once to set up the allocator itself. |
94 | */ |
95 | static unsigned long __init init_bootmem_core(bootmem_data_t *bdata, |
96 | unsigned long mapstart, unsigned long start, unsigned long end) |
97 | { |
98 | unsigned long mapsize; |
99 | |
100 | mminit_validate_memmodel_limits(&start, &end); |
101 | bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart)); |
102 | bdata->node_min_pfn = start; |
103 | bdata->node_low_pfn = end; |
104 | link_bootmem(bdata); |
105 | |
106 | /* |
107 | * Initially all pages are reserved - setup_arch() has to |
108 | * register free RAM areas explicitly. |
109 | */ |
110 | mapsize = bootmap_bytes(end - start); |
111 | memset(bdata->node_bootmem_map, 0xff, mapsize); |
112 | |
113 | bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n", |
114 | bdata - bootmem_node_data, start, mapstart, end, mapsize); |
115 | |
116 | return mapsize; |
117 | } |
118 | |
119 | /** |
120 | * init_bootmem_node - register a node as boot memory |
121 | * @pgdat: node to register |
122 | * @freepfn: pfn where the bitmap for this node is to be placed |
123 | * @startpfn: first pfn on the node |
124 | * @endpfn: first pfn after the node |
125 | * |
126 | * Returns the number of bytes needed to hold the bitmap for this node. |
127 | */ |
128 | unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn, |
129 | unsigned long startpfn, unsigned long endpfn) |
130 | { |
131 | return init_bootmem_core(pgdat->bdata, freepfn, startpfn, endpfn); |
132 | } |
133 | |
134 | /** |
135 | * init_bootmem - register boot memory |
136 | * @start: pfn where the bitmap is to be placed |
137 | * @pages: number of available physical pages |
138 | * |
139 | * Returns the number of bytes needed to hold the bitmap. |
140 | */ |
141 | unsigned long __init init_bootmem(unsigned long start, unsigned long pages) |
142 | { |
143 | max_low_pfn = pages; |
144 | min_low_pfn = start; |
145 | return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages); |
146 | } |
147 | |
148 | /* |
149 | * free_bootmem_late - free bootmem pages directly to page allocator |
150 | * @addr: starting address of the range |
151 | * @size: size of the range in bytes |
152 | * |
153 | * This is only useful when the bootmem allocator has already been torn |
154 | * down, but we are still initializing the system. Pages are given directly |
155 | * to the page allocator, no bootmem metadata is updated because it is gone. |
156 | */ |
157 | void __init free_bootmem_late(unsigned long addr, unsigned long size) |
158 | { |
159 | unsigned long cursor, end; |
160 | |
161 | kmemleak_free_part(__va(addr), size); |
162 | |
163 | cursor = PFN_UP(addr); |
164 | end = PFN_DOWN(addr + size); |
165 | |
166 | for (; cursor < end; cursor++) { |
167 | __free_pages_bootmem(pfn_to_page(cursor), 0); |
168 | totalram_pages++; |
169 | } |
170 | } |
171 | |
172 | static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata) |
173 | { |
174 | int aligned; |
175 | struct page *page; |
176 | unsigned long start, end, pages, count = 0; |
177 | |
178 | if (!bdata->node_bootmem_map) |
179 | return 0; |
180 | |
181 | start = bdata->node_min_pfn; |
182 | end = bdata->node_low_pfn; |
183 | |
184 | /* |
185 | * If the start is aligned to the machines wordsize, we might |
186 | * be able to free pages in bulks of that order. |
187 | */ |
188 | aligned = !(start & (BITS_PER_LONG - 1)); |
189 | |
190 | bdebug("nid=%td start=%lx end=%lx aligned=%d\n", |
191 | bdata - bootmem_node_data, start, end, aligned); |
192 | |
193 | while (start < end) { |
194 | unsigned long *map, idx, vec; |
195 | |
196 | map = bdata->node_bootmem_map; |
197 | idx = start - bdata->node_min_pfn; |
198 | vec = ~map[idx / BITS_PER_LONG]; |
199 | |
200 | if (aligned && vec == ~0UL && start + BITS_PER_LONG < end) { |
201 | int order = ilog2(BITS_PER_LONG); |
202 | |
203 | __free_pages_bootmem(pfn_to_page(start), order); |
204 | count += BITS_PER_LONG; |
205 | } else { |
206 | unsigned long off = 0; |
207 | |
208 | while (vec && off < BITS_PER_LONG) { |
209 | if (vec & 1) { |
210 | page = pfn_to_page(start + off); |
211 | __free_pages_bootmem(page, 0); |
212 | count++; |
213 | } |
214 | vec >>= 1; |
215 | off++; |
216 | } |
217 | } |
218 | start += BITS_PER_LONG; |
219 | } |
220 | |
221 | page = virt_to_page(bdata->node_bootmem_map); |
222 | pages = bdata->node_low_pfn - bdata->node_min_pfn; |
223 | pages = bootmem_bootmap_pages(pages); |
224 | count += pages; |
225 | while (pages--) |
226 | __free_pages_bootmem(page++, 0); |
227 | |
228 | bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count); |
229 | |
230 | return count; |
231 | } |
232 | |
233 | /** |
234 | * free_all_bootmem_node - release a node's free pages to the buddy allocator |
235 | * @pgdat: node to be released |
236 | * |
237 | * Returns the number of pages actually released. |
238 | */ |
239 | unsigned long __init free_all_bootmem_node(pg_data_t *pgdat) |
240 | { |
241 | register_page_bootmem_info_node(pgdat); |
242 | return free_all_bootmem_core(pgdat->bdata); |
243 | } |
244 | |
245 | /** |
246 | * free_all_bootmem - release free pages to the buddy allocator |
247 | * |
248 | * Returns the number of pages actually released. |
249 | */ |
250 | unsigned long __init free_all_bootmem(void) |
251 | { |
252 | unsigned long total_pages = 0; |
253 | bootmem_data_t *bdata; |
254 | |
255 | list_for_each_entry(bdata, &bdata_list, list) |
256 | total_pages += free_all_bootmem_core(bdata); |
257 | |
258 | return total_pages; |
259 | } |
260 | |
261 | static void __init __free(bootmem_data_t *bdata, |
262 | unsigned long sidx, unsigned long eidx) |
263 | { |
264 | unsigned long idx; |
265 | |
266 | bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data, |
267 | sidx + bdata->node_min_pfn, |
268 | eidx + bdata->node_min_pfn); |
269 | |
270 | if (bdata->hint_idx > sidx) |
271 | bdata->hint_idx = sidx; |
272 | |
273 | for (idx = sidx; idx < eidx; idx++) |
274 | if (!test_and_clear_bit(idx, bdata->node_bootmem_map)) |
275 | BUG(); |
276 | } |
277 | |
278 | static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx, |
279 | unsigned long eidx, int flags) |
280 | { |
281 | unsigned long idx; |
282 | int exclusive = flags & BOOTMEM_EXCLUSIVE; |
283 | |
284 | bdebug("nid=%td start=%lx end=%lx flags=%x\n", |
285 | bdata - bootmem_node_data, |
286 | sidx + bdata->node_min_pfn, |
287 | eidx + bdata->node_min_pfn, |
288 | flags); |
289 | |
290 | for (idx = sidx; idx < eidx; idx++) |
291 | if (test_and_set_bit(idx, bdata->node_bootmem_map)) { |
292 | if (exclusive) { |
293 | __free(bdata, sidx, idx); |
294 | return -EBUSY; |
295 | } |
296 | bdebug("silent double reserve of PFN %lx\n", |
297 | idx + bdata->node_min_pfn); |
298 | } |
299 | return 0; |
300 | } |
301 | |
302 | static int __init mark_bootmem_node(bootmem_data_t *bdata, |
303 | unsigned long start, unsigned long end, |
304 | int reserve, int flags) |
305 | { |
306 | unsigned long sidx, eidx; |
307 | |
308 | bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n", |
309 | bdata - bootmem_node_data, start, end, reserve, flags); |
310 | |
311 | BUG_ON(start < bdata->node_min_pfn); |
312 | BUG_ON(end > bdata->node_low_pfn); |
313 | |
314 | sidx = start - bdata->node_min_pfn; |
315 | eidx = end - bdata->node_min_pfn; |
316 | |
317 | if (reserve) |
318 | return __reserve(bdata, sidx, eidx, flags); |
319 | else |
320 | __free(bdata, sidx, eidx); |
321 | return 0; |
322 | } |
323 | |
324 | static int __init mark_bootmem(unsigned long start, unsigned long end, |
325 | int reserve, int flags) |
326 | { |
327 | unsigned long pos; |
328 | bootmem_data_t *bdata; |
329 | |
330 | pos = start; |
331 | list_for_each_entry(bdata, &bdata_list, list) { |
332 | int err; |
333 | unsigned long max; |
334 | |
335 | if (pos < bdata->node_min_pfn || |
336 | pos >= bdata->node_low_pfn) { |
337 | BUG_ON(pos != start); |
338 | continue; |
339 | } |
340 | |
341 | max = min(bdata->node_low_pfn, end); |
342 | |
343 | err = mark_bootmem_node(bdata, pos, max, reserve, flags); |
344 | if (reserve && err) { |
345 | mark_bootmem(start, pos, 0, 0); |
346 | return err; |
347 | } |
348 | |
349 | if (max == end) |
350 | return 0; |
351 | pos = bdata->node_low_pfn; |
352 | } |
353 | BUG(); |
354 | } |
355 | |
356 | /** |
357 | * free_bootmem_node - mark a page range as usable |
358 | * @pgdat: node the range resides on |
359 | * @physaddr: starting address of the range |
360 | * @size: size of the range in bytes |
361 | * |
362 | * Partial pages will be considered reserved and left as they are. |
363 | * |
364 | * The range must reside completely on the specified node. |
365 | */ |
366 | void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, |
367 | unsigned long size) |
368 | { |
369 | unsigned long start, end; |
370 | |
371 | kmemleak_free_part(__va(physaddr), size); |
372 | |
373 | start = PFN_UP(physaddr); |
374 | end = PFN_DOWN(physaddr + size); |
375 | |
376 | mark_bootmem_node(pgdat->bdata, start, end, 0, 0); |
377 | } |
378 | |
379 | /** |
380 | * free_bootmem - mark a page range as usable |
381 | * @addr: starting address of the range |
382 | * @size: size of the range in bytes |
383 | * |
384 | * Partial pages will be considered reserved and left as they are. |
385 | * |
386 | * The range must be contiguous but may span node boundaries. |
387 | */ |
388 | void __init free_bootmem(unsigned long addr, unsigned long size) |
389 | { |
390 | unsigned long start, end; |
391 | |
392 | kmemleak_free_part(__va(addr), size); |
393 | |
394 | start = PFN_UP(addr); |
395 | end = PFN_DOWN(addr + size); |
396 | |
397 | mark_bootmem(start, end, 0, 0); |
398 | } |
399 | |
400 | /** |
401 | * reserve_bootmem_node - mark a page range as reserved |
402 | * @pgdat: node the range resides on |
403 | * @physaddr: starting address of the range |
404 | * @size: size of the range in bytes |
405 | * @flags: reservation flags (see linux/bootmem.h) |
406 | * |
407 | * Partial pages will be reserved. |
408 | * |
409 | * The range must reside completely on the specified node. |
410 | */ |
411 | int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, |
412 | unsigned long size, int flags) |
413 | { |
414 | unsigned long start, end; |
415 | |
416 | start = PFN_DOWN(physaddr); |
417 | end = PFN_UP(physaddr + size); |
418 | |
419 | return mark_bootmem_node(pgdat->bdata, start, end, 1, flags); |
420 | } |
421 | |
422 | /** |
423 | * reserve_bootmem - mark a page range as usable |
424 | * @addr: starting address of the range |
425 | * @size: size of the range in bytes |
426 | * @flags: reservation flags (see linux/bootmem.h) |
427 | * |
428 | * Partial pages will be reserved. |
429 | * |
430 | * The range must be contiguous but may span node boundaries. |
431 | */ |
432 | int __init reserve_bootmem(unsigned long addr, unsigned long size, |
433 | int flags) |
434 | { |
435 | unsigned long start, end; |
436 | |
437 | start = PFN_DOWN(addr); |
438 | end = PFN_UP(addr + size); |
439 | |
440 | return mark_bootmem(start, end, 1, flags); |
441 | } |
442 | |
443 | int __weak __init reserve_bootmem_generic(unsigned long phys, unsigned long len, |
444 | int flags) |
445 | { |
446 | return reserve_bootmem(phys, len, flags); |
447 | } |
448 | |
449 | static unsigned long __init align_idx(struct bootmem_data *bdata, |
450 | unsigned long idx, unsigned long step) |
451 | { |
452 | unsigned long base = bdata->node_min_pfn; |
453 | |
454 | /* |
455 | * Align the index with respect to the node start so that the |
456 | * combination of both satisfies the requested alignment. |
457 | */ |
458 | |
459 | return ALIGN(base + idx, step) - base; |
460 | } |
461 | |
462 | static unsigned long __init align_off(struct bootmem_data *bdata, |
463 | unsigned long off, unsigned long align) |
464 | { |
465 | unsigned long base = PFN_PHYS(bdata->node_min_pfn); |
466 | |
467 | /* Same as align_idx for byte offsets */ |
468 | |
469 | return ALIGN(base + off, align) - base; |
470 | } |
471 | |
472 | static void * __init alloc_bootmem_core(struct bootmem_data *bdata, |
473 | unsigned long size, unsigned long align, |
474 | unsigned long goal, unsigned long limit) |
475 | { |
476 | unsigned long fallback = 0; |
477 | unsigned long min, max, start, sidx, midx, step; |
478 | |
479 | bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n", |
480 | bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT, |
481 | align, goal, limit); |
482 | |
483 | BUG_ON(!size); |
484 | BUG_ON(align & (align - 1)); |
485 | BUG_ON(limit && goal + size > limit); |
486 | |
487 | if (!bdata->node_bootmem_map) |
488 | return NULL; |
489 | |
490 | min = bdata->node_min_pfn; |
491 | max = bdata->node_low_pfn; |
492 | |
493 | goal >>= PAGE_SHIFT; |
494 | limit >>= PAGE_SHIFT; |
495 | |
496 | if (limit && max > limit) |
497 | max = limit; |
498 | if (max <= min) |
499 | return NULL; |
500 | |
501 | step = max(align >> PAGE_SHIFT, 1UL); |
502 | |
503 | if (goal && min < goal && goal < max) |
504 | start = ALIGN(goal, step); |
505 | else |
506 | start = ALIGN(min, step); |
507 | |
508 | sidx = start - bdata->node_min_pfn; |
509 | midx = max - bdata->node_min_pfn; |
510 | |
511 | if (bdata->hint_idx > sidx) { |
512 | /* |
513 | * Handle the valid case of sidx being zero and still |
514 | * catch the fallback below. |
515 | */ |
516 | fallback = sidx + 1; |
517 | sidx = align_idx(bdata, bdata->hint_idx, step); |
518 | } |
519 | |
520 | while (1) { |
521 | int merge; |
522 | void *region; |
523 | unsigned long eidx, i, start_off, end_off; |
524 | find_block: |
525 | sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx); |
526 | sidx = align_idx(bdata, sidx, step); |
527 | eidx = sidx + PFN_UP(size); |
528 | |
529 | if (sidx >= midx || eidx > midx) |
530 | break; |
531 | |
532 | for (i = sidx; i < eidx; i++) |
533 | if (test_bit(i, bdata->node_bootmem_map)) { |
534 | sidx = align_idx(bdata, i, step); |
535 | if (sidx == i) |
536 | sidx += step; |
537 | goto find_block; |
538 | } |
539 | |
540 | if (bdata->last_end_off & (PAGE_SIZE - 1) && |
541 | PFN_DOWN(bdata->last_end_off) + 1 == sidx) |
542 | start_off = align_off(bdata, bdata->last_end_off, align); |
543 | else |
544 | start_off = PFN_PHYS(sidx); |
545 | |
546 | merge = PFN_DOWN(start_off) < sidx; |
547 | end_off = start_off + size; |
548 | |
549 | bdata->last_end_off = end_off; |
550 | bdata->hint_idx = PFN_UP(end_off); |
551 | |
552 | /* |
553 | * Reserve the area now: |
554 | */ |
555 | if (__reserve(bdata, PFN_DOWN(start_off) + merge, |
556 | PFN_UP(end_off), BOOTMEM_EXCLUSIVE)) |
557 | BUG(); |
558 | |
559 | region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) + |
560 | start_off); |
561 | memset(region, 0, size); |
562 | /* |
563 | * The min_count is set to 0 so that bootmem allocated blocks |
564 | * are never reported as leaks. |
565 | */ |
566 | kmemleak_alloc(region, size, 0, 0); |
567 | return region; |
568 | } |
569 | |
570 | if (fallback) { |
571 | sidx = align_idx(bdata, fallback - 1, step); |
572 | fallback = 0; |
573 | goto find_block; |
574 | } |
575 | |
576 | return NULL; |
577 | } |
578 | |
579 | static void * __init alloc_arch_preferred_bootmem(bootmem_data_t *bdata, |
580 | unsigned long size, unsigned long align, |
581 | unsigned long goal, unsigned long limit) |
582 | { |
583 | if (WARN_ON_ONCE(slab_is_available())) |
584 | return kzalloc(size, GFP_NOWAIT); |
585 | |
586 | #ifdef CONFIG_HAVE_ARCH_BOOTMEM |
587 | { |
588 | bootmem_data_t *p_bdata; |
589 | |
590 | p_bdata = bootmem_arch_preferred_node(bdata, size, align, |
591 | goal, limit); |
592 | if (p_bdata) |
593 | return alloc_bootmem_core(p_bdata, size, align, |
594 | goal, limit); |
595 | } |
596 | #endif |
597 | return NULL; |
598 | } |
599 | |
600 | static void * __init ___alloc_bootmem_nopanic(unsigned long size, |
601 | unsigned long align, |
602 | unsigned long goal, |
603 | unsigned long limit) |
604 | { |
605 | bootmem_data_t *bdata; |
606 | void *region; |
607 | |
608 | restart: |
609 | region = alloc_arch_preferred_bootmem(NULL, size, align, goal, limit); |
610 | if (region) |
611 | return region; |
612 | |
613 | list_for_each_entry(bdata, &bdata_list, list) { |
614 | if (goal && bdata->node_low_pfn <= PFN_DOWN(goal)) |
615 | continue; |
616 | if (limit && bdata->node_min_pfn >= PFN_DOWN(limit)) |
617 | break; |
618 | |
619 | region = alloc_bootmem_core(bdata, size, align, goal, limit); |
620 | if (region) |
621 | return region; |
622 | } |
623 | |
624 | if (goal) { |
625 | goal = 0; |
626 | goto restart; |
627 | } |
628 | |
629 | return NULL; |
630 | } |
631 | |
632 | /** |
633 | * __alloc_bootmem_nopanic - allocate boot memory without panicking |
634 | * @size: size of the request in bytes |
635 | * @align: alignment of the region |
636 | * @goal: preferred starting address of the region |
637 | * |
638 | * The goal is dropped if it can not be satisfied and the allocation will |
639 | * fall back to memory below @goal. |
640 | * |
641 | * Allocation may happen on any node in the system. |
642 | * |
643 | * Returns NULL on failure. |
644 | */ |
645 | void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align, |
646 | unsigned long goal) |
647 | { |
648 | unsigned long limit = 0; |
649 | |
650 | return ___alloc_bootmem_nopanic(size, align, goal, limit); |
651 | } |
652 | |
653 | static void * __init ___alloc_bootmem(unsigned long size, unsigned long align, |
654 | unsigned long goal, unsigned long limit) |
655 | { |
656 | void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit); |
657 | |
658 | if (mem) |
659 | return mem; |
660 | /* |
661 | * Whoops, we cannot satisfy the allocation request. |
662 | */ |
663 | printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size); |
664 | panic("Out of memory"); |
665 | return NULL; |
666 | } |
667 | |
668 | /** |
669 | * __alloc_bootmem - allocate boot memory |
670 | * @size: size of the request in bytes |
671 | * @align: alignment of the region |
672 | * @goal: preferred starting address of the region |
673 | * |
674 | * The goal is dropped if it can not be satisfied and the allocation will |
675 | * fall back to memory below @goal. |
676 | * |
677 | * Allocation may happen on any node in the system. |
678 | * |
679 | * The function panics if the request can not be satisfied. |
680 | */ |
681 | void * __init __alloc_bootmem(unsigned long size, unsigned long align, |
682 | unsigned long goal) |
683 | { |
684 | unsigned long limit = 0; |
685 | |
686 | return ___alloc_bootmem(size, align, goal, limit); |
687 | } |
688 | |
689 | static void * __init ___alloc_bootmem_node(bootmem_data_t *bdata, |
690 | unsigned long size, unsigned long align, |
691 | unsigned long goal, unsigned long limit) |
692 | { |
693 | void *ptr; |
694 | |
695 | ptr = alloc_arch_preferred_bootmem(bdata, size, align, goal, limit); |
696 | if (ptr) |
697 | return ptr; |
698 | |
699 | ptr = alloc_bootmem_core(bdata, size, align, goal, limit); |
700 | if (ptr) |
701 | return ptr; |
702 | |
703 | return ___alloc_bootmem(size, align, goal, limit); |
704 | } |
705 | |
706 | /** |
707 | * __alloc_bootmem_node - allocate boot memory from a specific node |
708 | * @pgdat: node to allocate from |
709 | * @size: size of the request in bytes |
710 | * @align: alignment of the region |
711 | * @goal: preferred starting address of the region |
712 | * |
713 | * The goal is dropped if it can not be satisfied and the allocation will |
714 | * fall back to memory below @goal. |
715 | * |
716 | * Allocation may fall back to any node in the system if the specified node |
717 | * can not hold the requested memory. |
718 | * |
719 | * The function panics if the request can not be satisfied. |
720 | */ |
721 | void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, |
722 | unsigned long align, unsigned long goal) |
723 | { |
724 | if (WARN_ON_ONCE(slab_is_available())) |
725 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
726 | |
727 | return ___alloc_bootmem_node(pgdat->bdata, size, align, goal, 0); |
728 | } |
729 | |
730 | void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size, |
731 | unsigned long align, unsigned long goal) |
732 | { |
733 | #ifdef MAX_DMA32_PFN |
734 | unsigned long end_pfn; |
735 | |
736 | if (WARN_ON_ONCE(slab_is_available())) |
737 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
738 | |
739 | /* update goal according ...MAX_DMA32_PFN */ |
740 | end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages; |
741 | |
742 | if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) && |
743 | (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) { |
744 | void *ptr; |
745 | unsigned long new_goal; |
746 | |
747 | new_goal = MAX_DMA32_PFN << PAGE_SHIFT; |
748 | ptr = alloc_bootmem_core(pgdat->bdata, size, align, |
749 | new_goal, 0); |
750 | if (ptr) |
751 | return ptr; |
752 | } |
753 | #endif |
754 | |
755 | return __alloc_bootmem_node(pgdat, size, align, goal); |
756 | |
757 | } |
758 | |
759 | #ifdef CONFIG_SPARSEMEM |
760 | /** |
761 | * alloc_bootmem_section - allocate boot memory from a specific section |
762 | * @size: size of the request in bytes |
763 | * @section_nr: sparse map section to allocate from |
764 | * |
765 | * Return NULL on failure. |
766 | */ |
767 | void * __init alloc_bootmem_section(unsigned long size, |
768 | unsigned long section_nr) |
769 | { |
770 | bootmem_data_t *bdata; |
771 | unsigned long pfn, goal, limit; |
772 | |
773 | pfn = section_nr_to_pfn(section_nr); |
774 | goal = pfn << PAGE_SHIFT; |
775 | limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT; |
776 | bdata = &bootmem_node_data[early_pfn_to_nid(pfn)]; |
777 | |
778 | return alloc_bootmem_core(bdata, size, SMP_CACHE_BYTES, goal, limit); |
779 | } |
780 | #endif |
781 | |
782 | void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size, |
783 | unsigned long align, unsigned long goal) |
784 | { |
785 | void *ptr; |
786 | |
787 | if (WARN_ON_ONCE(slab_is_available())) |
788 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
789 | |
790 | ptr = alloc_arch_preferred_bootmem(pgdat->bdata, size, align, goal, 0); |
791 | if (ptr) |
792 | return ptr; |
793 | |
794 | ptr = alloc_bootmem_core(pgdat->bdata, size, align, goal, 0); |
795 | if (ptr) |
796 | return ptr; |
797 | |
798 | return __alloc_bootmem_nopanic(size, align, goal); |
799 | } |
800 | |
801 | #ifndef ARCH_LOW_ADDRESS_LIMIT |
802 | #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL |
803 | #endif |
804 | |
805 | /** |
806 | * __alloc_bootmem_low - allocate low boot memory |
807 | * @size: size of the request in bytes |
808 | * @align: alignment of the region |
809 | * @goal: preferred starting address of the region |
810 | * |
811 | * The goal is dropped if it can not be satisfied and the allocation will |
812 | * fall back to memory below @goal. |
813 | * |
814 | * Allocation may happen on any node in the system. |
815 | * |
816 | * The function panics if the request can not be satisfied. |
817 | */ |
818 | void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, |
819 | unsigned long goal) |
820 | { |
821 | return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT); |
822 | } |
823 | |
824 | /** |
825 | * __alloc_bootmem_low_node - allocate low boot memory from a specific node |
826 | * @pgdat: node to allocate from |
827 | * @size: size of the request in bytes |
828 | * @align: alignment of the region |
829 | * @goal: preferred starting address of the region |
830 | * |
831 | * The goal is dropped if it can not be satisfied and the allocation will |
832 | * fall back to memory below @goal. |
833 | * |
834 | * Allocation may fall back to any node in the system if the specified node |
835 | * can not hold the requested memory. |
836 | * |
837 | * The function panics if the request can not be satisfied. |
838 | */ |
839 | void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size, |
840 | unsigned long align, unsigned long goal) |
841 | { |
842 | if (WARN_ON_ONCE(slab_is_available())) |
843 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
844 | |
845 | return ___alloc_bootmem_node(pgdat->bdata, size, align, |
846 | goal, ARCH_LOW_ADDRESS_LIMIT); |
847 | } |
848 |
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