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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/module.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 | unsigned long max_low_pfn; |
27 | unsigned long min_low_pfn; |
28 | unsigned long max_pfn; |
29 | |
30 | #ifdef CONFIG_CRASH_DUMP |
31 | /* |
32 | * If we have booted due to a crash, max_pfn will be a very low value. We need |
33 | * to know the amount of memory that the previous kernel used. |
34 | */ |
35 | unsigned long saved_max_pfn; |
36 | #endif |
37 | |
38 | #ifndef CONFIG_NO_BOOTMEM |
39 | bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata; |
40 | |
41 | static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list); |
42 | |
43 | static int bootmem_debug; |
44 | |
45 | static int __init bootmem_debug_setup(char *buf) |
46 | { |
47 | bootmem_debug = 1; |
48 | return 0; |
49 | } |
50 | early_param("bootmem_debug", bootmem_debug_setup); |
51 | |
52 | #define bdebug(fmt, args...) ({ \ |
53 | if (unlikely(bootmem_debug)) \ |
54 | printk(KERN_INFO \ |
55 | "bootmem::%s " fmt, \ |
56 | __func__, ## args); \ |
57 | }) |
58 | |
59 | static unsigned long __init bootmap_bytes(unsigned long pages) |
60 | { |
61 | unsigned long bytes = (pages + 7) / 8; |
62 | |
63 | return ALIGN(bytes, sizeof(long)); |
64 | } |
65 | |
66 | /** |
67 | * bootmem_bootmap_pages - calculate bitmap size in pages |
68 | * @pages: number of pages the bitmap has to represent |
69 | */ |
70 | unsigned long __init bootmem_bootmap_pages(unsigned long pages) |
71 | { |
72 | unsigned long bytes = bootmap_bytes(pages); |
73 | |
74 | return PAGE_ALIGN(bytes) >> PAGE_SHIFT; |
75 | } |
76 | |
77 | /* |
78 | * link bdata in order |
79 | */ |
80 | static void __init link_bootmem(bootmem_data_t *bdata) |
81 | { |
82 | struct list_head *iter; |
83 | |
84 | list_for_each(iter, &bdata_list) { |
85 | bootmem_data_t *ent; |
86 | |
87 | ent = list_entry(iter, bootmem_data_t, list); |
88 | if (bdata->node_min_pfn < ent->node_min_pfn) |
89 | break; |
90 | } |
91 | list_add_tail(&bdata->list, iter); |
92 | } |
93 | |
94 | /* |
95 | * Called once to set up the allocator itself. |
96 | */ |
97 | static unsigned long __init init_bootmem_core(bootmem_data_t *bdata, |
98 | unsigned long mapstart, unsigned long start, unsigned long end) |
99 | { |
100 | unsigned long mapsize; |
101 | |
102 | mminit_validate_memmodel_limits(&start, &end); |
103 | bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart)); |
104 | bdata->node_min_pfn = start; |
105 | bdata->node_low_pfn = end; |
106 | link_bootmem(bdata); |
107 | |
108 | /* |
109 | * Initially all pages are reserved - setup_arch() has to |
110 | * register free RAM areas explicitly. |
111 | */ |
112 | mapsize = bootmap_bytes(end - start); |
113 | memset(bdata->node_bootmem_map, 0xff, mapsize); |
114 | |
115 | bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n", |
116 | bdata - bootmem_node_data, start, mapstart, end, mapsize); |
117 | |
118 | return mapsize; |
119 | } |
120 | |
121 | /** |
122 | * init_bootmem_node - register a node as boot memory |
123 | * @pgdat: node to register |
124 | * @freepfn: pfn where the bitmap for this node is to be placed |
125 | * @startpfn: first pfn on the node |
126 | * @endpfn: first pfn after the node |
127 | * |
128 | * Returns the number of bytes needed to hold the bitmap for this node. |
129 | */ |
130 | unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn, |
131 | unsigned long startpfn, unsigned long endpfn) |
132 | { |
133 | return init_bootmem_core(pgdat->bdata, freepfn, startpfn, endpfn); |
134 | } |
135 | |
136 | /** |
137 | * init_bootmem - register boot memory |
138 | * @start: pfn where the bitmap is to be placed |
139 | * @pages: number of available physical pages |
140 | * |
141 | * Returns the number of bytes needed to hold the bitmap. |
142 | */ |
143 | unsigned long __init init_bootmem(unsigned long start, unsigned long pages) |
144 | { |
145 | max_low_pfn = pages; |
146 | min_low_pfn = start; |
147 | return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages); |
148 | } |
149 | #endif |
150 | /* |
151 | * free_bootmem_late - free bootmem pages directly to page allocator |
152 | * @addr: starting address of the range |
153 | * @size: size of the range in bytes |
154 | * |
155 | * This is only useful when the bootmem allocator has already been torn |
156 | * down, but we are still initializing the system. Pages are given directly |
157 | * to the page allocator, no bootmem metadata is updated because it is gone. |
158 | */ |
159 | void __init free_bootmem_late(unsigned long addr, unsigned long size) |
160 | { |
161 | unsigned long cursor, end; |
162 | |
163 | kmemleak_free_part(__va(addr), size); |
164 | |
165 | cursor = PFN_UP(addr); |
166 | end = PFN_DOWN(addr + size); |
167 | |
168 | for (; cursor < end; cursor++) { |
169 | __free_pages_bootmem(pfn_to_page(cursor), 0); |
170 | totalram_pages++; |
171 | } |
172 | } |
173 | |
174 | #ifdef CONFIG_NO_BOOTMEM |
175 | static void __init __free_pages_memory(unsigned long start, unsigned long end) |
176 | { |
177 | int i; |
178 | unsigned long start_aligned, end_aligned; |
179 | int order = ilog2(BITS_PER_LONG); |
180 | |
181 | start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1); |
182 | end_aligned = end & ~(BITS_PER_LONG - 1); |
183 | |
184 | if (end_aligned <= start_aligned) { |
185 | for (i = start; i < end; i++) |
186 | __free_pages_bootmem(pfn_to_page(i), 0); |
187 | |
188 | return; |
189 | } |
190 | |
191 | for (i = start; i < start_aligned; i++) |
192 | __free_pages_bootmem(pfn_to_page(i), 0); |
193 | |
194 | for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG) |
195 | __free_pages_bootmem(pfn_to_page(i), order); |
196 | |
197 | for (i = end_aligned; i < end; i++) |
198 | __free_pages_bootmem(pfn_to_page(i), 0); |
199 | } |
200 | |
201 | unsigned long __init free_all_memory_core_early(int nodeid) |
202 | { |
203 | int i; |
204 | u64 start, end; |
205 | unsigned long count = 0; |
206 | struct range *range = NULL; |
207 | int nr_range; |
208 | |
209 | nr_range = get_free_all_memory_range(&range, nodeid); |
210 | |
211 | for (i = 0; i < nr_range; i++) { |
212 | start = range[i].start; |
213 | end = range[i].end; |
214 | count += end - start; |
215 | __free_pages_memory(start, end); |
216 | } |
217 | |
218 | return count; |
219 | } |
220 | #else |
221 | static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata) |
222 | { |
223 | int aligned; |
224 | struct page *page; |
225 | unsigned long start, end, pages, count = 0; |
226 | |
227 | if (!bdata->node_bootmem_map) |
228 | return 0; |
229 | |
230 | start = bdata->node_min_pfn; |
231 | end = bdata->node_low_pfn; |
232 | |
233 | /* |
234 | * If the start is aligned to the machines wordsize, we might |
235 | * be able to free pages in bulks of that order. |
236 | */ |
237 | aligned = !(start & (BITS_PER_LONG - 1)); |
238 | |
239 | bdebug("nid=%td start=%lx end=%lx aligned=%d\n", |
240 | bdata - bootmem_node_data, start, end, aligned); |
241 | |
242 | while (start < end) { |
243 | unsigned long *map, idx, vec; |
244 | |
245 | map = bdata->node_bootmem_map; |
246 | idx = start - bdata->node_min_pfn; |
247 | vec = ~map[idx / BITS_PER_LONG]; |
248 | |
249 | if (aligned && vec == ~0UL && start + BITS_PER_LONG < end) { |
250 | int order = ilog2(BITS_PER_LONG); |
251 | |
252 | __free_pages_bootmem(pfn_to_page(start), order); |
253 | count += BITS_PER_LONG; |
254 | } else { |
255 | unsigned long off = 0; |
256 | |
257 | while (vec && off < BITS_PER_LONG) { |
258 | if (vec & 1) { |
259 | page = pfn_to_page(start + off); |
260 | __free_pages_bootmem(page, 0); |
261 | count++; |
262 | } |
263 | vec >>= 1; |
264 | off++; |
265 | } |
266 | } |
267 | start += BITS_PER_LONG; |
268 | } |
269 | |
270 | page = virt_to_page(bdata->node_bootmem_map); |
271 | pages = bdata->node_low_pfn - bdata->node_min_pfn; |
272 | pages = bootmem_bootmap_pages(pages); |
273 | count += pages; |
274 | while (pages--) |
275 | __free_pages_bootmem(page++, 0); |
276 | |
277 | bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count); |
278 | |
279 | return count; |
280 | } |
281 | #endif |
282 | |
283 | /** |
284 | * free_all_bootmem_node - release a node's free pages to the buddy allocator |
285 | * @pgdat: node to be released |
286 | * |
287 | * Returns the number of pages actually released. |
288 | */ |
289 | unsigned long __init free_all_bootmem_node(pg_data_t *pgdat) |
290 | { |
291 | register_page_bootmem_info_node(pgdat); |
292 | #ifdef CONFIG_NO_BOOTMEM |
293 | /* free_all_memory_core_early(MAX_NUMNODES) will be called later */ |
294 | return 0; |
295 | #else |
296 | return free_all_bootmem_core(pgdat->bdata); |
297 | #endif |
298 | } |
299 | |
300 | /** |
301 | * free_all_bootmem - release free pages to the buddy allocator |
302 | * |
303 | * Returns the number of pages actually released. |
304 | */ |
305 | unsigned long __init free_all_bootmem(void) |
306 | { |
307 | #ifdef CONFIG_NO_BOOTMEM |
308 | /* |
309 | * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id |
310 | * because in some case like Node0 doesnt have RAM installed |
311 | * low ram will be on Node1 |
312 | * Use MAX_NUMNODES will make sure all ranges in early_node_map[] |
313 | * will be used instead of only Node0 related |
314 | */ |
315 | return free_all_memory_core_early(MAX_NUMNODES); |
316 | #else |
317 | unsigned long total_pages = 0; |
318 | bootmem_data_t *bdata; |
319 | |
320 | list_for_each_entry(bdata, &bdata_list, list) |
321 | total_pages += free_all_bootmem_core(bdata); |
322 | |
323 | return total_pages; |
324 | #endif |
325 | } |
326 | |
327 | #ifndef CONFIG_NO_BOOTMEM |
328 | static void __init __free(bootmem_data_t *bdata, |
329 | unsigned long sidx, unsigned long eidx) |
330 | { |
331 | unsigned long idx; |
332 | |
333 | bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data, |
334 | sidx + bdata->node_min_pfn, |
335 | eidx + bdata->node_min_pfn); |
336 | |
337 | if (bdata->hint_idx > sidx) |
338 | bdata->hint_idx = sidx; |
339 | |
340 | for (idx = sidx; idx < eidx; idx++) |
341 | if (!test_and_clear_bit(idx, bdata->node_bootmem_map)) |
342 | BUG(); |
343 | } |
344 | |
345 | static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx, |
346 | unsigned long eidx, int flags) |
347 | { |
348 | unsigned long idx; |
349 | int exclusive = flags & BOOTMEM_EXCLUSIVE; |
350 | |
351 | bdebug("nid=%td start=%lx end=%lx flags=%x\n", |
352 | bdata - bootmem_node_data, |
353 | sidx + bdata->node_min_pfn, |
354 | eidx + bdata->node_min_pfn, |
355 | flags); |
356 | |
357 | for (idx = sidx; idx < eidx; idx++) |
358 | if (test_and_set_bit(idx, bdata->node_bootmem_map)) { |
359 | if (exclusive) { |
360 | __free(bdata, sidx, idx); |
361 | return -EBUSY; |
362 | } |
363 | bdebug("silent double reserve of PFN %lx\n", |
364 | idx + bdata->node_min_pfn); |
365 | } |
366 | return 0; |
367 | } |
368 | |
369 | static int __init mark_bootmem_node(bootmem_data_t *bdata, |
370 | unsigned long start, unsigned long end, |
371 | int reserve, int flags) |
372 | { |
373 | unsigned long sidx, eidx; |
374 | |
375 | bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n", |
376 | bdata - bootmem_node_data, start, end, reserve, flags); |
377 | |
378 | BUG_ON(start < bdata->node_min_pfn); |
379 | BUG_ON(end > bdata->node_low_pfn); |
380 | |
381 | sidx = start - bdata->node_min_pfn; |
382 | eidx = end - bdata->node_min_pfn; |
383 | |
384 | if (reserve) |
385 | return __reserve(bdata, sidx, eidx, flags); |
386 | else |
387 | __free(bdata, sidx, eidx); |
388 | return 0; |
389 | } |
390 | |
391 | static int __init mark_bootmem(unsigned long start, unsigned long end, |
392 | int reserve, int flags) |
393 | { |
394 | unsigned long pos; |
395 | bootmem_data_t *bdata; |
396 | |
397 | pos = start; |
398 | list_for_each_entry(bdata, &bdata_list, list) { |
399 | int err; |
400 | unsigned long max; |
401 | |
402 | if (pos < bdata->node_min_pfn || |
403 | pos >= bdata->node_low_pfn) { |
404 | BUG_ON(pos != start); |
405 | continue; |
406 | } |
407 | |
408 | max = min(bdata->node_low_pfn, end); |
409 | |
410 | err = mark_bootmem_node(bdata, pos, max, reserve, flags); |
411 | if (reserve && err) { |
412 | mark_bootmem(start, pos, 0, 0); |
413 | return err; |
414 | } |
415 | |
416 | if (max == end) |
417 | return 0; |
418 | pos = bdata->node_low_pfn; |
419 | } |
420 | BUG(); |
421 | } |
422 | #endif |
423 | |
424 | /** |
425 | * free_bootmem_node - mark a page range as usable |
426 | * @pgdat: node the range resides on |
427 | * @physaddr: starting address of the range |
428 | * @size: size of the range in bytes |
429 | * |
430 | * Partial pages will be considered reserved and left as they are. |
431 | * |
432 | * The range must reside completely on the specified node. |
433 | */ |
434 | void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, |
435 | unsigned long size) |
436 | { |
437 | #ifdef CONFIG_NO_BOOTMEM |
438 | kmemleak_free_part(__va(physaddr), size); |
439 | memblock_x86_free_range(physaddr, physaddr + size); |
440 | #else |
441 | unsigned long start, end; |
442 | |
443 | kmemleak_free_part(__va(physaddr), size); |
444 | |
445 | start = PFN_UP(physaddr); |
446 | end = PFN_DOWN(physaddr + size); |
447 | |
448 | mark_bootmem_node(pgdat->bdata, start, end, 0, 0); |
449 | #endif |
450 | } |
451 | |
452 | /** |
453 | * free_bootmem - mark a page range as usable |
454 | * @addr: starting address of the range |
455 | * @size: size of the range in bytes |
456 | * |
457 | * Partial pages will be considered reserved and left as they are. |
458 | * |
459 | * The range must be contiguous but may span node boundaries. |
460 | */ |
461 | void __init free_bootmem(unsigned long addr, unsigned long size) |
462 | { |
463 | #ifdef CONFIG_NO_BOOTMEM |
464 | kmemleak_free_part(__va(addr), size); |
465 | memblock_x86_free_range(addr, addr + size); |
466 | #else |
467 | unsigned long start, end; |
468 | |
469 | kmemleak_free_part(__va(addr), size); |
470 | |
471 | start = PFN_UP(addr); |
472 | end = PFN_DOWN(addr + size); |
473 | |
474 | mark_bootmem(start, end, 0, 0); |
475 | #endif |
476 | } |
477 | |
478 | /** |
479 | * reserve_bootmem_node - mark a page range as reserved |
480 | * @pgdat: node the range resides on |
481 | * @physaddr: starting address of the range |
482 | * @size: size of the range in bytes |
483 | * @flags: reservation flags (see linux/bootmem.h) |
484 | * |
485 | * Partial pages will be reserved. |
486 | * |
487 | * The range must reside completely on the specified node. |
488 | */ |
489 | int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, |
490 | unsigned long size, int flags) |
491 | { |
492 | #ifdef CONFIG_NO_BOOTMEM |
493 | panic("no bootmem"); |
494 | return 0; |
495 | #else |
496 | unsigned long start, end; |
497 | |
498 | start = PFN_DOWN(physaddr); |
499 | end = PFN_UP(physaddr + size); |
500 | |
501 | return mark_bootmem_node(pgdat->bdata, start, end, 1, flags); |
502 | #endif |
503 | } |
504 | |
505 | /** |
506 | * reserve_bootmem - mark a page range as usable |
507 | * @addr: starting address of the range |
508 | * @size: size of the range in bytes |
509 | * @flags: reservation flags (see linux/bootmem.h) |
510 | * |
511 | * Partial pages will be reserved. |
512 | * |
513 | * The range must be contiguous but may span node boundaries. |
514 | */ |
515 | int __init reserve_bootmem(unsigned long addr, unsigned long size, |
516 | int flags) |
517 | { |
518 | #ifdef CONFIG_NO_BOOTMEM |
519 | panic("no bootmem"); |
520 | return 0; |
521 | #else |
522 | unsigned long start, end; |
523 | |
524 | start = PFN_DOWN(addr); |
525 | end = PFN_UP(addr + size); |
526 | |
527 | return mark_bootmem(start, end, 1, flags); |
528 | #endif |
529 | } |
530 | |
531 | #ifndef CONFIG_NO_BOOTMEM |
532 | int __weak __init reserve_bootmem_generic(unsigned long phys, unsigned long len, |
533 | int flags) |
534 | { |
535 | return reserve_bootmem(phys, len, flags); |
536 | } |
537 | |
538 | static unsigned long __init align_idx(struct bootmem_data *bdata, |
539 | unsigned long idx, unsigned long step) |
540 | { |
541 | unsigned long base = bdata->node_min_pfn; |
542 | |
543 | /* |
544 | * Align the index with respect to the node start so that the |
545 | * combination of both satisfies the requested alignment. |
546 | */ |
547 | |
548 | return ALIGN(base + idx, step) - base; |
549 | } |
550 | |
551 | static unsigned long __init align_off(struct bootmem_data *bdata, |
552 | unsigned long off, unsigned long align) |
553 | { |
554 | unsigned long base = PFN_PHYS(bdata->node_min_pfn); |
555 | |
556 | /* Same as align_idx for byte offsets */ |
557 | |
558 | return ALIGN(base + off, align) - base; |
559 | } |
560 | |
561 | static void * __init alloc_bootmem_core(struct bootmem_data *bdata, |
562 | unsigned long size, unsigned long align, |
563 | unsigned long goal, unsigned long limit) |
564 | { |
565 | unsigned long fallback = 0; |
566 | unsigned long min, max, start, sidx, midx, step; |
567 | |
568 | bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n", |
569 | bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT, |
570 | align, goal, limit); |
571 | |
572 | BUG_ON(!size); |
573 | BUG_ON(align & (align - 1)); |
574 | BUG_ON(limit && goal + size > limit); |
575 | |
576 | if (!bdata->node_bootmem_map) |
577 | return NULL; |
578 | |
579 | min = bdata->node_min_pfn; |
580 | max = bdata->node_low_pfn; |
581 | |
582 | goal >>= PAGE_SHIFT; |
583 | limit >>= PAGE_SHIFT; |
584 | |
585 | if (limit && max > limit) |
586 | max = limit; |
587 | if (max <= min) |
588 | return NULL; |
589 | |
590 | step = max(align >> PAGE_SHIFT, 1UL); |
591 | |
592 | if (goal && min < goal && goal < max) |
593 | start = ALIGN(goal, step); |
594 | else |
595 | start = ALIGN(min, step); |
596 | |
597 | sidx = start - bdata->node_min_pfn; |
598 | midx = max - bdata->node_min_pfn; |
599 | |
600 | if (bdata->hint_idx > sidx) { |
601 | /* |
602 | * Handle the valid case of sidx being zero and still |
603 | * catch the fallback below. |
604 | */ |
605 | fallback = sidx + 1; |
606 | sidx = align_idx(bdata, bdata->hint_idx, step); |
607 | } |
608 | |
609 | while (1) { |
610 | int merge; |
611 | void *region; |
612 | unsigned long eidx, i, start_off, end_off; |
613 | find_block: |
614 | sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx); |
615 | sidx = align_idx(bdata, sidx, step); |
616 | eidx = sidx + PFN_UP(size); |
617 | |
618 | if (sidx >= midx || eidx > midx) |
619 | break; |
620 | |
621 | for (i = sidx; i < eidx; i++) |
622 | if (test_bit(i, bdata->node_bootmem_map)) { |
623 | sidx = align_idx(bdata, i, step); |
624 | if (sidx == i) |
625 | sidx += step; |
626 | goto find_block; |
627 | } |
628 | |
629 | if (bdata->last_end_off & (PAGE_SIZE - 1) && |
630 | PFN_DOWN(bdata->last_end_off) + 1 == sidx) |
631 | start_off = align_off(bdata, bdata->last_end_off, align); |
632 | else |
633 | start_off = PFN_PHYS(sidx); |
634 | |
635 | merge = PFN_DOWN(start_off) < sidx; |
636 | end_off = start_off + size; |
637 | |
638 | bdata->last_end_off = end_off; |
639 | bdata->hint_idx = PFN_UP(end_off); |
640 | |
641 | /* |
642 | * Reserve the area now: |
643 | */ |
644 | if (__reserve(bdata, PFN_DOWN(start_off) + merge, |
645 | PFN_UP(end_off), BOOTMEM_EXCLUSIVE)) |
646 | BUG(); |
647 | |
648 | region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) + |
649 | start_off); |
650 | memset(region, 0, size); |
651 | /* |
652 | * The min_count is set to 0 so that bootmem allocated blocks |
653 | * are never reported as leaks. |
654 | */ |
655 | kmemleak_alloc(region, size, 0, 0); |
656 | return region; |
657 | } |
658 | |
659 | if (fallback) { |
660 | sidx = align_idx(bdata, fallback - 1, step); |
661 | fallback = 0; |
662 | goto find_block; |
663 | } |
664 | |
665 | return NULL; |
666 | } |
667 | |
668 | static void * __init alloc_arch_preferred_bootmem(bootmem_data_t *bdata, |
669 | unsigned long size, unsigned long align, |
670 | unsigned long goal, unsigned long limit) |
671 | { |
672 | if (WARN_ON_ONCE(slab_is_available())) |
673 | return kzalloc(size, GFP_NOWAIT); |
674 | |
675 | #ifdef CONFIG_HAVE_ARCH_BOOTMEM |
676 | { |
677 | bootmem_data_t *p_bdata; |
678 | |
679 | p_bdata = bootmem_arch_preferred_node(bdata, size, align, |
680 | goal, limit); |
681 | if (p_bdata) |
682 | return alloc_bootmem_core(p_bdata, size, align, |
683 | goal, limit); |
684 | } |
685 | #endif |
686 | return NULL; |
687 | } |
688 | #endif |
689 | |
690 | static void * __init ___alloc_bootmem_nopanic(unsigned long size, |
691 | unsigned long align, |
692 | unsigned long goal, |
693 | unsigned long limit) |
694 | { |
695 | #ifdef CONFIG_NO_BOOTMEM |
696 | void *ptr; |
697 | |
698 | if (WARN_ON_ONCE(slab_is_available())) |
699 | return kzalloc(size, GFP_NOWAIT); |
700 | |
701 | restart: |
702 | |
703 | ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit); |
704 | |
705 | if (ptr) |
706 | return ptr; |
707 | |
708 | if (goal != 0) { |
709 | goal = 0; |
710 | goto restart; |
711 | } |
712 | |
713 | return NULL; |
714 | #else |
715 | bootmem_data_t *bdata; |
716 | void *region; |
717 | |
718 | restart: |
719 | region = alloc_arch_preferred_bootmem(NULL, size, align, goal, limit); |
720 | if (region) |
721 | return region; |
722 | |
723 | list_for_each_entry(bdata, &bdata_list, list) { |
724 | if (goal && bdata->node_low_pfn <= PFN_DOWN(goal)) |
725 | continue; |
726 | if (limit && bdata->node_min_pfn >= PFN_DOWN(limit)) |
727 | break; |
728 | |
729 | region = alloc_bootmem_core(bdata, size, align, goal, limit); |
730 | if (region) |
731 | return region; |
732 | } |
733 | |
734 | if (goal) { |
735 | goal = 0; |
736 | goto restart; |
737 | } |
738 | |
739 | return NULL; |
740 | #endif |
741 | } |
742 | |
743 | /** |
744 | * __alloc_bootmem_nopanic - allocate boot memory without panicking |
745 | * @size: size of the request in bytes |
746 | * @align: alignment of the region |
747 | * @goal: preferred starting address of the region |
748 | * |
749 | * The goal is dropped if it can not be satisfied and the allocation will |
750 | * fall back to memory below @goal. |
751 | * |
752 | * Allocation may happen on any node in the system. |
753 | * |
754 | * Returns NULL on failure. |
755 | */ |
756 | void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align, |
757 | unsigned long goal) |
758 | { |
759 | unsigned long limit = 0; |
760 | |
761 | #ifdef CONFIG_NO_BOOTMEM |
762 | limit = -1UL; |
763 | #endif |
764 | |
765 | return ___alloc_bootmem_nopanic(size, align, goal, limit); |
766 | } |
767 | |
768 | static void * __init ___alloc_bootmem(unsigned long size, unsigned long align, |
769 | unsigned long goal, unsigned long limit) |
770 | { |
771 | void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit); |
772 | |
773 | if (mem) |
774 | return mem; |
775 | /* |
776 | * Whoops, we cannot satisfy the allocation request. |
777 | */ |
778 | printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size); |
779 | panic("Out of memory"); |
780 | return NULL; |
781 | } |
782 | |
783 | /** |
784 | * __alloc_bootmem - allocate boot memory |
785 | * @size: size of the request in bytes |
786 | * @align: alignment of the region |
787 | * @goal: preferred starting address of the region |
788 | * |
789 | * The goal is dropped if it can not be satisfied and the allocation will |
790 | * fall back to memory below @goal. |
791 | * |
792 | * Allocation may happen on any node in the system. |
793 | * |
794 | * The function panics if the request can not be satisfied. |
795 | */ |
796 | void * __init __alloc_bootmem(unsigned long size, unsigned long align, |
797 | unsigned long goal) |
798 | { |
799 | unsigned long limit = 0; |
800 | |
801 | #ifdef CONFIG_NO_BOOTMEM |
802 | limit = -1UL; |
803 | #endif |
804 | |
805 | return ___alloc_bootmem(size, align, goal, limit); |
806 | } |
807 | |
808 | #ifndef CONFIG_NO_BOOTMEM |
809 | static void * __init ___alloc_bootmem_node(bootmem_data_t *bdata, |
810 | unsigned long size, unsigned long align, |
811 | unsigned long goal, unsigned long limit) |
812 | { |
813 | void *ptr; |
814 | |
815 | ptr = alloc_arch_preferred_bootmem(bdata, size, align, goal, limit); |
816 | if (ptr) |
817 | return ptr; |
818 | |
819 | ptr = alloc_bootmem_core(bdata, size, align, goal, limit); |
820 | if (ptr) |
821 | return ptr; |
822 | |
823 | return ___alloc_bootmem(size, align, goal, limit); |
824 | } |
825 | #endif |
826 | |
827 | /** |
828 | * __alloc_bootmem_node - allocate boot memory from a specific node |
829 | * @pgdat: node to allocate from |
830 | * @size: size of the request in bytes |
831 | * @align: alignment of the region |
832 | * @goal: preferred starting address of the region |
833 | * |
834 | * The goal is dropped if it can not be satisfied and the allocation will |
835 | * fall back to memory below @goal. |
836 | * |
837 | * Allocation may fall back to any node in the system if the specified node |
838 | * can not hold the requested memory. |
839 | * |
840 | * The function panics if the request can not be satisfied. |
841 | */ |
842 | void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, |
843 | unsigned long align, unsigned long goal) |
844 | { |
845 | void *ptr; |
846 | |
847 | if (WARN_ON_ONCE(slab_is_available())) |
848 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
849 | |
850 | #ifdef CONFIG_NO_BOOTMEM |
851 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, |
852 | goal, -1ULL); |
853 | if (ptr) |
854 | return ptr; |
855 | |
856 | ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, |
857 | goal, -1ULL); |
858 | #else |
859 | ptr = ___alloc_bootmem_node(pgdat->bdata, size, align, goal, 0); |
860 | #endif |
861 | |
862 | return ptr; |
863 | } |
864 | |
865 | void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size, |
866 | unsigned long align, unsigned long goal) |
867 | { |
868 | #ifdef MAX_DMA32_PFN |
869 | unsigned long end_pfn; |
870 | |
871 | if (WARN_ON_ONCE(slab_is_available())) |
872 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
873 | |
874 | /* update goal according ...MAX_DMA32_PFN */ |
875 | end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages; |
876 | |
877 | if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) && |
878 | (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) { |
879 | void *ptr; |
880 | unsigned long new_goal; |
881 | |
882 | new_goal = MAX_DMA32_PFN << PAGE_SHIFT; |
883 | #ifdef CONFIG_NO_BOOTMEM |
884 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, |
885 | new_goal, -1ULL); |
886 | #else |
887 | ptr = alloc_bootmem_core(pgdat->bdata, size, align, |
888 | new_goal, 0); |
889 | #endif |
890 | if (ptr) |
891 | return ptr; |
892 | } |
893 | #endif |
894 | |
895 | return __alloc_bootmem_node(pgdat, size, align, goal); |
896 | |
897 | } |
898 | |
899 | #ifdef CONFIG_SPARSEMEM |
900 | /** |
901 | * alloc_bootmem_section - allocate boot memory from a specific section |
902 | * @size: size of the request in bytes |
903 | * @section_nr: sparse map section to allocate from |
904 | * |
905 | * Return NULL on failure. |
906 | */ |
907 | void * __init alloc_bootmem_section(unsigned long size, |
908 | unsigned long section_nr) |
909 | { |
910 | #ifdef CONFIG_NO_BOOTMEM |
911 | unsigned long pfn, goal, limit; |
912 | |
913 | pfn = section_nr_to_pfn(section_nr); |
914 | goal = pfn << PAGE_SHIFT; |
915 | limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT; |
916 | |
917 | return __alloc_memory_core_early(early_pfn_to_nid(pfn), size, |
918 | SMP_CACHE_BYTES, goal, limit); |
919 | #else |
920 | bootmem_data_t *bdata; |
921 | unsigned long pfn, goal, limit; |
922 | |
923 | pfn = section_nr_to_pfn(section_nr); |
924 | goal = pfn << PAGE_SHIFT; |
925 | limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT; |
926 | bdata = &bootmem_node_data[early_pfn_to_nid(pfn)]; |
927 | |
928 | return alloc_bootmem_core(bdata, size, SMP_CACHE_BYTES, goal, limit); |
929 | #endif |
930 | } |
931 | #endif |
932 | |
933 | void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size, |
934 | unsigned long align, unsigned long goal) |
935 | { |
936 | void *ptr; |
937 | |
938 | if (WARN_ON_ONCE(slab_is_available())) |
939 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
940 | |
941 | #ifdef CONFIG_NO_BOOTMEM |
942 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, |
943 | goal, -1ULL); |
944 | #else |
945 | ptr = alloc_arch_preferred_bootmem(pgdat->bdata, size, align, goal, 0); |
946 | if (ptr) |
947 | return ptr; |
948 | |
949 | ptr = alloc_bootmem_core(pgdat->bdata, size, align, goal, 0); |
950 | #endif |
951 | if (ptr) |
952 | return ptr; |
953 | |
954 | return __alloc_bootmem_nopanic(size, align, goal); |
955 | } |
956 | |
957 | #ifndef ARCH_LOW_ADDRESS_LIMIT |
958 | #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL |
959 | #endif |
960 | |
961 | /** |
962 | * __alloc_bootmem_low - allocate low boot memory |
963 | * @size: size of the request in bytes |
964 | * @align: alignment of the region |
965 | * @goal: preferred starting address of the region |
966 | * |
967 | * The goal is dropped if it can not be satisfied and the allocation will |
968 | * fall back to memory below @goal. |
969 | * |
970 | * Allocation may happen on any node in the system. |
971 | * |
972 | * The function panics if the request can not be satisfied. |
973 | */ |
974 | void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, |
975 | unsigned long goal) |
976 | { |
977 | return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT); |
978 | } |
979 | |
980 | /** |
981 | * __alloc_bootmem_low_node - allocate low boot memory from a specific node |
982 | * @pgdat: node to allocate from |
983 | * @size: size of the request in bytes |
984 | * @align: alignment of the region |
985 | * @goal: preferred starting address of the region |
986 | * |
987 | * The goal is dropped if it can not be satisfied and the allocation will |
988 | * fall back to memory below @goal. |
989 | * |
990 | * Allocation may fall back to any node in the system if the specified node |
991 | * can not hold the requested memory. |
992 | * |
993 | * The function panics if the request can not be satisfied. |
994 | */ |
995 | void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size, |
996 | unsigned long align, unsigned long goal) |
997 | { |
998 | void *ptr; |
999 | |
1000 | if (WARN_ON_ONCE(slab_is_available())) |
1001 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
1002 | |
1003 | #ifdef CONFIG_NO_BOOTMEM |
1004 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, |
1005 | goal, ARCH_LOW_ADDRESS_LIMIT); |
1006 | if (ptr) |
1007 | return ptr; |
1008 | ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, |
1009 | goal, ARCH_LOW_ADDRESS_LIMIT); |
1010 | #else |
1011 | ptr = ___alloc_bootmem_node(pgdat->bdata, size, align, |
1012 | goal, ARCH_LOW_ADDRESS_LIMIT); |
1013 | #endif |
1014 | return ptr; |
1015 | } |
1016 |
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