This source file includes following definitions.
- page_to_nid
- set_section_nid
- set_section_nid
- sparse_index_alloc
- sparse_index_init
- sparse_index_init
- __section_nr
- __section_nr
- sparse_encode_early_nid
- sparse_early_nid
- mminit_validate_memmodel_limits
- section_mark_present
- next_present_section_nr
- first_present_section_nr
- subsection_mask_set
- subsection_map_init
- memory_present
- memblocks_present
- sparse_encode_mem_map
- sparse_decode_mem_map
- sparse_init_one_section
- usemap_size
- mem_section_usage_size
- sparse_early_usemaps_alloc_pgdat_section
- check_usemap_section_nr
- sparse_early_usemaps_alloc_pgdat_section
- check_usemap_section_nr
- section_map_size
- section_map_size
- __populate_section_memmap
- sparse_buffer_free
- sparse_buffer_init
- sparse_buffer_fini
- sparse_buffer_alloc
- vmemmap_populate_print_last
- sparse_init_nid
- sparse_init
- online_mem_sections
- offline_mem_sections
- populate_section_memmap
- depopulate_section_memmap
- free_map_bootmem
- populate_section_memmap
- depopulate_section_memmap
- free_map_bootmem
- section_deactivate
- section_activate
- sparse_add_section
- clear_hwpoisoned_pages
- clear_hwpoisoned_pages
- sparse_remove_section
1
2
3
4
5 #include <linux/mm.h>
6 #include <linux/slab.h>
7 #include <linux/mmzone.h>
8 #include <linux/memblock.h>
9 #include <linux/compiler.h>
10 #include <linux/highmem.h>
11 #include <linux/export.h>
12 #include <linux/spinlock.h>
13 #include <linux/vmalloc.h>
14 #include <linux/swap.h>
15 #include <linux/swapops.h>
16
17 #include "internal.h"
18 #include <asm/dma.h>
19 #include <asm/pgalloc.h>
20 #include <asm/pgtable.h>
21
22
23
24
25
26
27 #ifdef CONFIG_SPARSEMEM_EXTREME
28 struct mem_section **mem_section;
29 #else
30 struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]
31 ____cacheline_internodealigned_in_smp;
32 #endif
33 EXPORT_SYMBOL(mem_section);
34
35 #ifdef NODE_NOT_IN_PAGE_FLAGS
36
37
38
39
40
41 #if MAX_NUMNODES <= 256
42 static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
43 #else
44 static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
45 #endif
46
47 int page_to_nid(const struct page *page)
48 {
49 return section_to_node_table[page_to_section(page)];
50 }
51 EXPORT_SYMBOL(page_to_nid);
52
53 static void set_section_nid(unsigned long section_nr, int nid)
54 {
55 section_to_node_table[section_nr] = nid;
56 }
57 #else
58 static inline void set_section_nid(unsigned long section_nr, int nid)
59 {
60 }
61 #endif
62
63 #ifdef CONFIG_SPARSEMEM_EXTREME
64 static noinline struct mem_section __ref *sparse_index_alloc(int nid)
65 {
66 struct mem_section *section = NULL;
67 unsigned long array_size = SECTIONS_PER_ROOT *
68 sizeof(struct mem_section);
69
70 if (slab_is_available()) {
71 section = kzalloc_node(array_size, GFP_KERNEL, nid);
72 } else {
73 section = memblock_alloc_node(array_size, SMP_CACHE_BYTES,
74 nid);
75 if (!section)
76 panic("%s: Failed to allocate %lu bytes nid=%d\n",
77 __func__, array_size, nid);
78 }
79
80 return section;
81 }
82
83 static int __meminit sparse_index_init(unsigned long section_nr, int nid)
84 {
85 unsigned long root = SECTION_NR_TO_ROOT(section_nr);
86 struct mem_section *section;
87
88
89
90
91
92
93
94
95 if (mem_section[root])
96 return 0;
97
98 section = sparse_index_alloc(nid);
99 if (!section)
100 return -ENOMEM;
101
102 mem_section[root] = section;
103
104 return 0;
105 }
106 #else
107 static inline int sparse_index_init(unsigned long section_nr, int nid)
108 {
109 return 0;
110 }
111 #endif
112
113 #ifdef CONFIG_SPARSEMEM_EXTREME
114 unsigned long __section_nr(struct mem_section *ms)
115 {
116 unsigned long root_nr;
117 struct mem_section *root = NULL;
118
119 for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) {
120 root = __nr_to_section(root_nr * SECTIONS_PER_ROOT);
121 if (!root)
122 continue;
123
124 if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT)))
125 break;
126 }
127
128 VM_BUG_ON(!root);
129
130 return (root_nr * SECTIONS_PER_ROOT) + (ms - root);
131 }
132 #else
133 unsigned long __section_nr(struct mem_section *ms)
134 {
135 return (unsigned long)(ms - mem_section[0]);
136 }
137 #endif
138
139
140
141
142
143
144
145 static inline unsigned long sparse_encode_early_nid(int nid)
146 {
147 return (nid << SECTION_NID_SHIFT);
148 }
149
150 static inline int sparse_early_nid(struct mem_section *section)
151 {
152 return (section->section_mem_map >> SECTION_NID_SHIFT);
153 }
154
155
156 void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn,
157 unsigned long *end_pfn)
158 {
159 unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);
160
161
162
163
164
165 if (*start_pfn > max_sparsemem_pfn) {
166 mminit_dprintk(MMINIT_WARNING, "pfnvalidation",
167 "Start of range %lu -> %lu exceeds SPARSEMEM max %lu\n",
168 *start_pfn, *end_pfn, max_sparsemem_pfn);
169 WARN_ON_ONCE(1);
170 *start_pfn = max_sparsemem_pfn;
171 *end_pfn = max_sparsemem_pfn;
172 } else if (*end_pfn > max_sparsemem_pfn) {
173 mminit_dprintk(MMINIT_WARNING, "pfnvalidation",
174 "End of range %lu -> %lu exceeds SPARSEMEM max %lu\n",
175 *start_pfn, *end_pfn, max_sparsemem_pfn);
176 WARN_ON_ONCE(1);
177 *end_pfn = max_sparsemem_pfn;
178 }
179 }
180
181
182
183
184
185
186
187
188
189
190 unsigned long __highest_present_section_nr;
191 static void section_mark_present(struct mem_section *ms)
192 {
193 unsigned long section_nr = __section_nr(ms);
194
195 if (section_nr > __highest_present_section_nr)
196 __highest_present_section_nr = section_nr;
197
198 ms->section_mem_map |= SECTION_MARKED_PRESENT;
199 }
200
201 static inline unsigned long next_present_section_nr(unsigned long section_nr)
202 {
203 do {
204 section_nr++;
205 if (present_section_nr(section_nr))
206 return section_nr;
207 } while ((section_nr <= __highest_present_section_nr));
208
209 return -1;
210 }
211 #define for_each_present_section_nr(start, section_nr) \
212 for (section_nr = next_present_section_nr(start-1); \
213 ((section_nr != -1) && \
214 (section_nr <= __highest_present_section_nr)); \
215 section_nr = next_present_section_nr(section_nr))
216
217 static inline unsigned long first_present_section_nr(void)
218 {
219 return next_present_section_nr(-1);
220 }
221
222 static void subsection_mask_set(unsigned long *map, unsigned long pfn,
223 unsigned long nr_pages)
224 {
225 int idx = subsection_map_index(pfn);
226 int end = subsection_map_index(pfn + nr_pages - 1);
227
228 bitmap_set(map, idx, end - idx + 1);
229 }
230
231 void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages)
232 {
233 int end_sec = pfn_to_section_nr(pfn + nr_pages - 1);
234 unsigned long nr, start_sec = pfn_to_section_nr(pfn);
235
236 if (!nr_pages)
237 return;
238
239 for (nr = start_sec; nr <= end_sec; nr++) {
240 struct mem_section *ms;
241 unsigned long pfns;
242
243 pfns = min(nr_pages, PAGES_PER_SECTION
244 - (pfn & ~PAGE_SECTION_MASK));
245 ms = __nr_to_section(nr);
246 subsection_mask_set(ms->usage->subsection_map, pfn, pfns);
247
248 pr_debug("%s: sec: %lu pfns: %lu set(%d, %d)\n", __func__, nr,
249 pfns, subsection_map_index(pfn),
250 subsection_map_index(pfn + pfns - 1));
251
252 pfn += pfns;
253 nr_pages -= pfns;
254 }
255 }
256
257
258 void __init memory_present(int nid, unsigned long start, unsigned long end)
259 {
260 unsigned long pfn;
261
262 #ifdef CONFIG_SPARSEMEM_EXTREME
263 if (unlikely(!mem_section)) {
264 unsigned long size, align;
265
266 size = sizeof(struct mem_section*) * NR_SECTION_ROOTS;
267 align = 1 << (INTERNODE_CACHE_SHIFT);
268 mem_section = memblock_alloc(size, align);
269 if (!mem_section)
270 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
271 __func__, size, align);
272 }
273 #endif
274
275 start &= PAGE_SECTION_MASK;
276 mminit_validate_memmodel_limits(&start, &end);
277 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
278 unsigned long section = pfn_to_section_nr(pfn);
279 struct mem_section *ms;
280
281 sparse_index_init(section, nid);
282 set_section_nid(section, nid);
283
284 ms = __nr_to_section(section);
285 if (!ms->section_mem_map) {
286 ms->section_mem_map = sparse_encode_early_nid(nid) |
287 SECTION_IS_ONLINE;
288 section_mark_present(ms);
289 }
290 }
291 }
292
293
294
295
296
297
298 void __init memblocks_present(void)
299 {
300 struct memblock_region *reg;
301
302 for_each_memblock(memory, reg) {
303 memory_present(memblock_get_region_node(reg),
304 memblock_region_memory_base_pfn(reg),
305 memblock_region_memory_end_pfn(reg));
306 }
307 }
308
309
310
311
312
313
314 static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum)
315 {
316 unsigned long coded_mem_map =
317 (unsigned long)(mem_map - (section_nr_to_pfn(pnum)));
318 BUILD_BUG_ON(SECTION_MAP_LAST_BIT > (1UL<<PFN_SECTION_SHIFT));
319 BUG_ON(coded_mem_map & ~SECTION_MAP_MASK);
320 return coded_mem_map;
321 }
322
323
324
325
326 struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum)
327 {
328
329 coded_mem_map &= SECTION_MAP_MASK;
330 return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum);
331 }
332
333 static void __meminit sparse_init_one_section(struct mem_section *ms,
334 unsigned long pnum, struct page *mem_map,
335 struct mem_section_usage *usage, unsigned long flags)
336 {
337 ms->section_mem_map &= ~SECTION_MAP_MASK;
338 ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum)
339 | SECTION_HAS_MEM_MAP | flags;
340 ms->usage = usage;
341 }
342
343 static unsigned long usemap_size(void)
344 {
345 return BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS) * sizeof(unsigned long);
346 }
347
348 size_t mem_section_usage_size(void)
349 {
350 return sizeof(struct mem_section_usage) + usemap_size();
351 }
352
353 #ifdef CONFIG_MEMORY_HOTREMOVE
354 static struct mem_section_usage * __init
355 sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
356 unsigned long size)
357 {
358 struct mem_section_usage *usage;
359 unsigned long goal, limit;
360 int nid;
361
362
363
364
365
366
367
368
369
370
371 goal = __pa(pgdat) & (PAGE_SECTION_MASK << PAGE_SHIFT);
372 limit = goal + (1UL << PA_SECTION_SHIFT);
373 nid = early_pfn_to_nid(goal >> PAGE_SHIFT);
374 again:
375 usage = memblock_alloc_try_nid(size, SMP_CACHE_BYTES, goal, limit, nid);
376 if (!usage && limit) {
377 limit = 0;
378 goto again;
379 }
380 return usage;
381 }
382
383 static void __init check_usemap_section_nr(int nid,
384 struct mem_section_usage *usage)
385 {
386 unsigned long usemap_snr, pgdat_snr;
387 static unsigned long old_usemap_snr;
388 static unsigned long old_pgdat_snr;
389 struct pglist_data *pgdat = NODE_DATA(nid);
390 int usemap_nid;
391
392
393 if (!old_usemap_snr) {
394 old_usemap_snr = NR_MEM_SECTIONS;
395 old_pgdat_snr = NR_MEM_SECTIONS;
396 }
397
398 usemap_snr = pfn_to_section_nr(__pa(usage) >> PAGE_SHIFT);
399 pgdat_snr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT);
400 if (usemap_snr == pgdat_snr)
401 return;
402
403 if (old_usemap_snr == usemap_snr && old_pgdat_snr == pgdat_snr)
404
405 return;
406
407 old_usemap_snr = usemap_snr;
408 old_pgdat_snr = pgdat_snr;
409
410 usemap_nid = sparse_early_nid(__nr_to_section(usemap_snr));
411 if (usemap_nid != nid) {
412 pr_info("node %d must be removed before remove section %ld\n",
413 nid, usemap_snr);
414 return;
415 }
416
417
418
419
420
421
422 pr_info("Section %ld and %ld (node %d) have a circular dependency on usemap and pgdat allocations\n",
423 usemap_snr, pgdat_snr, nid);
424 }
425 #else
426 static struct mem_section_usage * __init
427 sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
428 unsigned long size)
429 {
430 return memblock_alloc_node(size, SMP_CACHE_BYTES, pgdat->node_id);
431 }
432
433 static void __init check_usemap_section_nr(int nid,
434 struct mem_section_usage *usage)
435 {
436 }
437 #endif
438
439 #ifdef CONFIG_SPARSEMEM_VMEMMAP
440 static unsigned long __init section_map_size(void)
441 {
442 return ALIGN(sizeof(struct page) * PAGES_PER_SECTION, PMD_SIZE);
443 }
444
445 #else
446 static unsigned long __init section_map_size(void)
447 {
448 return PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION);
449 }
450
451 struct page __init *__populate_section_memmap(unsigned long pfn,
452 unsigned long nr_pages, int nid, struct vmem_altmap *altmap)
453 {
454 unsigned long size = section_map_size();
455 struct page *map = sparse_buffer_alloc(size);
456 phys_addr_t addr = __pa(MAX_DMA_ADDRESS);
457
458 if (map)
459 return map;
460
461 map = memblock_alloc_try_nid(size,
462 PAGE_SIZE, addr,
463 MEMBLOCK_ALLOC_ACCESSIBLE, nid);
464 if (!map)
465 panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%pa\n",
466 __func__, size, PAGE_SIZE, nid, &addr);
467
468 return map;
469 }
470 #endif
471
472 static void *sparsemap_buf __meminitdata;
473 static void *sparsemap_buf_end __meminitdata;
474
475 static inline void __meminit sparse_buffer_free(unsigned long size)
476 {
477 WARN_ON(!sparsemap_buf || size == 0);
478 memblock_free_early(__pa(sparsemap_buf), size);
479 }
480
481 static void __init sparse_buffer_init(unsigned long size, int nid)
482 {
483 phys_addr_t addr = __pa(MAX_DMA_ADDRESS);
484 WARN_ON(sparsemap_buf);
485 sparsemap_buf =
486 memblock_alloc_try_nid_raw(size, PAGE_SIZE,
487 addr,
488 MEMBLOCK_ALLOC_ACCESSIBLE, nid);
489 sparsemap_buf_end = sparsemap_buf + size;
490 }
491
492 static void __init sparse_buffer_fini(void)
493 {
494 unsigned long size = sparsemap_buf_end - sparsemap_buf;
495
496 if (sparsemap_buf && size > 0)
497 sparse_buffer_free(size);
498 sparsemap_buf = NULL;
499 }
500
501 void * __meminit sparse_buffer_alloc(unsigned long size)
502 {
503 void *ptr = NULL;
504
505 if (sparsemap_buf) {
506 ptr = (void *) roundup((unsigned long)sparsemap_buf, size);
507 if (ptr + size > sparsemap_buf_end)
508 ptr = NULL;
509 else {
510
511 if ((unsigned long)(ptr - sparsemap_buf) > 0)
512 sparse_buffer_free((unsigned long)(ptr - sparsemap_buf));
513 sparsemap_buf = ptr + size;
514 }
515 }
516 return ptr;
517 }
518
519 void __weak __meminit vmemmap_populate_print_last(void)
520 {
521 }
522
523
524
525
526
527 static void __init sparse_init_nid(int nid, unsigned long pnum_begin,
528 unsigned long pnum_end,
529 unsigned long map_count)
530 {
531 struct mem_section_usage *usage;
532 unsigned long pnum;
533 struct page *map;
534
535 usage = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nid),
536 mem_section_usage_size() * map_count);
537 if (!usage) {
538 pr_err("%s: node[%d] usemap allocation failed", __func__, nid);
539 goto failed;
540 }
541 sparse_buffer_init(map_count * section_map_size(), nid);
542 for_each_present_section_nr(pnum_begin, pnum) {
543 unsigned long pfn = section_nr_to_pfn(pnum);
544
545 if (pnum >= pnum_end)
546 break;
547
548 map = __populate_section_memmap(pfn, PAGES_PER_SECTION,
549 nid, NULL);
550 if (!map) {
551 pr_err("%s: node[%d] memory map backing failed. Some memory will not be available.",
552 __func__, nid);
553 pnum_begin = pnum;
554 goto failed;
555 }
556 check_usemap_section_nr(nid, usage);
557 sparse_init_one_section(__nr_to_section(pnum), pnum, map, usage,
558 SECTION_IS_EARLY);
559 usage = (void *) usage + mem_section_usage_size();
560 }
561 sparse_buffer_fini();
562 return;
563 failed:
564
565 for_each_present_section_nr(pnum_begin, pnum) {
566 struct mem_section *ms;
567
568 if (pnum >= pnum_end)
569 break;
570 ms = __nr_to_section(pnum);
571 ms->section_mem_map = 0;
572 }
573 }
574
575
576
577
578
579 void __init sparse_init(void)
580 {
581 unsigned long pnum_begin = first_present_section_nr();
582 int nid_begin = sparse_early_nid(__nr_to_section(pnum_begin));
583 unsigned long pnum_end, map_count = 1;
584
585
586 set_pageblock_order();
587
588 for_each_present_section_nr(pnum_begin + 1, pnum_end) {
589 int nid = sparse_early_nid(__nr_to_section(pnum_end));
590
591 if (nid == nid_begin) {
592 map_count++;
593 continue;
594 }
595
596 sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count);
597 nid_begin = nid;
598 pnum_begin = pnum_end;
599 map_count = 1;
600 }
601
602 sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count);
603 vmemmap_populate_print_last();
604 }
605
606 #ifdef CONFIG_MEMORY_HOTPLUG
607
608
609 void online_mem_sections(unsigned long start_pfn, unsigned long end_pfn)
610 {
611 unsigned long pfn;
612
613 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
614 unsigned long section_nr = pfn_to_section_nr(pfn);
615 struct mem_section *ms;
616
617
618 if (WARN_ON(!valid_section_nr(section_nr)))
619 continue;
620
621 ms = __nr_to_section(section_nr);
622 ms->section_mem_map |= SECTION_IS_ONLINE;
623 }
624 }
625
626 #ifdef CONFIG_MEMORY_HOTREMOVE
627
628 void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn)
629 {
630 unsigned long pfn;
631
632 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
633 unsigned long section_nr = pfn_to_section_nr(pfn);
634 struct mem_section *ms;
635
636
637
638
639
640 if (WARN_ON(!valid_section_nr(section_nr)))
641 continue;
642
643 ms = __nr_to_section(section_nr);
644 ms->section_mem_map &= ~SECTION_IS_ONLINE;
645 }
646 }
647 #endif
648
649 #ifdef CONFIG_SPARSEMEM_VMEMMAP
650 static struct page * __meminit populate_section_memmap(unsigned long pfn,
651 unsigned long nr_pages, int nid, struct vmem_altmap *altmap)
652 {
653 return __populate_section_memmap(pfn, nr_pages, nid, altmap);
654 }
655
656 static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages,
657 struct vmem_altmap *altmap)
658 {
659 unsigned long start = (unsigned long) pfn_to_page(pfn);
660 unsigned long end = start + nr_pages * sizeof(struct page);
661
662 vmemmap_free(start, end, altmap);
663 }
664 static void free_map_bootmem(struct page *memmap)
665 {
666 unsigned long start = (unsigned long)memmap;
667 unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION);
668
669 vmemmap_free(start, end, NULL);
670 }
671 #else
672 struct page * __meminit populate_section_memmap(unsigned long pfn,
673 unsigned long nr_pages, int nid, struct vmem_altmap *altmap)
674 {
675 struct page *page, *ret;
676 unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION;
677
678 page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size));
679 if (page)
680 goto got_map_page;
681
682 ret = vmalloc(memmap_size);
683 if (ret)
684 goto got_map_ptr;
685
686 return NULL;
687 got_map_page:
688 ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
689 got_map_ptr:
690
691 return ret;
692 }
693
694 static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages,
695 struct vmem_altmap *altmap)
696 {
697 struct page *memmap = pfn_to_page(pfn);
698
699 if (is_vmalloc_addr(memmap))
700 vfree(memmap);
701 else
702 free_pages((unsigned long)memmap,
703 get_order(sizeof(struct page) * PAGES_PER_SECTION));
704 }
705
706 static void free_map_bootmem(struct page *memmap)
707 {
708 unsigned long maps_section_nr, removing_section_nr, i;
709 unsigned long magic, nr_pages;
710 struct page *page = virt_to_page(memmap);
711
712 nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page))
713 >> PAGE_SHIFT;
714
715 for (i = 0; i < nr_pages; i++, page++) {
716 magic = (unsigned long) page->freelist;
717
718 BUG_ON(magic == NODE_INFO);
719
720 maps_section_nr = pfn_to_section_nr(page_to_pfn(page));
721 removing_section_nr = page_private(page);
722
723
724
725
726
727
728
729
730
731 if (maps_section_nr != removing_section_nr)
732 put_page_bootmem(page);
733 }
734 }
735 #endif
736
737 static void section_deactivate(unsigned long pfn, unsigned long nr_pages,
738 struct vmem_altmap *altmap)
739 {
740 DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 };
741 DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 };
742 struct mem_section *ms = __pfn_to_section(pfn);
743 bool section_is_early = early_section(ms);
744 struct page *memmap = NULL;
745 bool empty;
746 unsigned long *subsection_map = ms->usage
747 ? &ms->usage->subsection_map[0] : NULL;
748
749 subsection_mask_set(map, pfn, nr_pages);
750 if (subsection_map)
751 bitmap_and(tmp, map, subsection_map, SUBSECTIONS_PER_SECTION);
752
753 if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION),
754 "section already deactivated (%#lx + %ld)\n",
755 pfn, nr_pages))
756 return;
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775 bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION);
776 empty = bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION);
777 if (empty) {
778 unsigned long section_nr = pfn_to_section_nr(pfn);
779
780
781
782
783
784
785
786
787 if (!PageReserved(virt_to_page(ms->usage))) {
788 kfree(ms->usage);
789 ms->usage = NULL;
790 }
791 memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
792
793
794
795
796
797 ms->section_mem_map &= ~SECTION_HAS_MEM_MAP;
798 }
799
800 if (section_is_early && memmap)
801 free_map_bootmem(memmap);
802 else
803 depopulate_section_memmap(pfn, nr_pages, altmap);
804
805 if (empty)
806 ms->section_mem_map = (unsigned long)NULL;
807 }
808
809 static struct page * __meminit section_activate(int nid, unsigned long pfn,
810 unsigned long nr_pages, struct vmem_altmap *altmap)
811 {
812 DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 };
813 struct mem_section *ms = __pfn_to_section(pfn);
814 struct mem_section_usage *usage = NULL;
815 unsigned long *subsection_map;
816 struct page *memmap;
817 int rc = 0;
818
819 subsection_mask_set(map, pfn, nr_pages);
820
821 if (!ms->usage) {
822 usage = kzalloc(mem_section_usage_size(), GFP_KERNEL);
823 if (!usage)
824 return ERR_PTR(-ENOMEM);
825 ms->usage = usage;
826 }
827 subsection_map = &ms->usage->subsection_map[0];
828
829 if (bitmap_empty(map, SUBSECTIONS_PER_SECTION))
830 rc = -EINVAL;
831 else if (bitmap_intersects(map, subsection_map, SUBSECTIONS_PER_SECTION))
832 rc = -EEXIST;
833 else
834 bitmap_or(subsection_map, map, subsection_map,
835 SUBSECTIONS_PER_SECTION);
836
837 if (rc) {
838 if (usage)
839 ms->usage = NULL;
840 kfree(usage);
841 return ERR_PTR(rc);
842 }
843
844
845
846
847
848
849
850
851 if (nr_pages < PAGES_PER_SECTION && early_section(ms))
852 return pfn_to_page(pfn);
853
854 memmap = populate_section_memmap(pfn, nr_pages, nid, altmap);
855 if (!memmap) {
856 section_deactivate(pfn, nr_pages, altmap);
857 return ERR_PTR(-ENOMEM);
858 }
859
860 return memmap;
861 }
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877 int __meminit sparse_add_section(int nid, unsigned long start_pfn,
878 unsigned long nr_pages, struct vmem_altmap *altmap)
879 {
880 unsigned long section_nr = pfn_to_section_nr(start_pfn);
881 struct mem_section *ms;
882 struct page *memmap;
883 int ret;
884
885 ret = sparse_index_init(section_nr, nid);
886 if (ret < 0)
887 return ret;
888
889 memmap = section_activate(nid, start_pfn, nr_pages, altmap);
890 if (IS_ERR(memmap))
891 return PTR_ERR(memmap);
892
893
894
895
896
897 page_init_poison(memmap, sizeof(struct page) * nr_pages);
898
899 ms = __nr_to_section(section_nr);
900 set_section_nid(section_nr, nid);
901 section_mark_present(ms);
902
903
904 if (section_nr_to_pfn(section_nr) != start_pfn)
905 memmap = pfn_to_kaddr(section_nr_to_pfn(section_nr));
906 sparse_init_one_section(ms, section_nr, memmap, ms->usage, 0);
907
908 return 0;
909 }
910
911 #ifdef CONFIG_MEMORY_FAILURE
912 static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
913 {
914 int i;
915
916
917
918
919
920
921
922 if (atomic_long_read(&num_poisoned_pages) == 0)
923 return;
924
925 for (i = 0; i < nr_pages; i++) {
926 if (PageHWPoison(&memmap[i])) {
927 num_poisoned_pages_dec();
928 ClearPageHWPoison(&memmap[i]);
929 }
930 }
931 }
932 #else
933 static inline void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
934 {
935 }
936 #endif
937
938 void sparse_remove_section(struct mem_section *ms, unsigned long pfn,
939 unsigned long nr_pages, unsigned long map_offset,
940 struct vmem_altmap *altmap)
941 {
942 clear_hwpoisoned_pages(pfn_to_page(pfn) + map_offset,
943 nr_pages - map_offset);
944 section_deactivate(pfn, nr_pages, altmap);
945 }
946 #endif