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Commit | Line | Data |
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d41dee36 AW |
1 | /* |
2 | * sparse memory mappings. | |
3 | */ | |
d41dee36 | 4 | #include <linux/mm.h> |
5a0e3ad6 | 5 | #include <linux/slab.h> |
d41dee36 AW |
6 | #include <linux/mmzone.h> |
7 | #include <linux/bootmem.h> | |
3b32123d | 8 | #include <linux/compiler.h> |
0b0acbec | 9 | #include <linux/highmem.h> |
b95f1b31 | 10 | #include <linux/export.h> |
28ae55c9 | 11 | #include <linux/spinlock.h> |
0b0acbec | 12 | #include <linux/vmalloc.h> |
3b32123d | 13 | |
0c0a4a51 | 14 | #include "internal.h" |
d41dee36 | 15 | #include <asm/dma.h> |
8f6aac41 CL |
16 | #include <asm/pgalloc.h> |
17 | #include <asm/pgtable.h> | |
d41dee36 AW |
18 | |
19 | /* | |
20 | * Permanent SPARSEMEM data: | |
21 | * | |
22 | * 1) mem_section - memory sections, mem_map's for valid memory | |
23 | */ | |
3e347261 | 24 | #ifdef CONFIG_SPARSEMEM_EXTREME |
802f192e | 25 | struct mem_section *mem_section[NR_SECTION_ROOTS] |
22fc6ecc | 26 | ____cacheline_internodealigned_in_smp; |
3e347261 BP |
27 | #else |
28 | struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT] | |
22fc6ecc | 29 | ____cacheline_internodealigned_in_smp; |
3e347261 BP |
30 | #endif |
31 | EXPORT_SYMBOL(mem_section); | |
32 | ||
89689ae7 CL |
33 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
34 | /* | |
35 | * If we did not store the node number in the page then we have to | |
36 | * do a lookup in the section_to_node_table in order to find which | |
37 | * node the page belongs to. | |
38 | */ | |
39 | #if MAX_NUMNODES <= 256 | |
40 | static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; | |
41 | #else | |
42 | static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; | |
43 | #endif | |
44 | ||
33dd4e0e | 45 | int page_to_nid(const struct page *page) |
89689ae7 CL |
46 | { |
47 | return section_to_node_table[page_to_section(page)]; | |
48 | } | |
49 | EXPORT_SYMBOL(page_to_nid); | |
85770ffe AW |
50 | |
51 | static void set_section_nid(unsigned long section_nr, int nid) | |
52 | { | |
53 | section_to_node_table[section_nr] = nid; | |
54 | } | |
55 | #else /* !NODE_NOT_IN_PAGE_FLAGS */ | |
56 | static inline void set_section_nid(unsigned long section_nr, int nid) | |
57 | { | |
58 | } | |
89689ae7 CL |
59 | #endif |
60 | ||
3e347261 | 61 | #ifdef CONFIG_SPARSEMEM_EXTREME |
bd721ea7 | 62 | static noinline struct mem_section __ref *sparse_index_alloc(int nid) |
28ae55c9 DH |
63 | { |
64 | struct mem_section *section = NULL; | |
65 | unsigned long array_size = SECTIONS_PER_ROOT * | |
66 | sizeof(struct mem_section); | |
67 | ||
f52407ce SL |
68 | if (slab_is_available()) { |
69 | if (node_state(nid, N_HIGH_MEMORY)) | |
5b760e64 | 70 | section = kzalloc_node(array_size, GFP_KERNEL, nid); |
f52407ce | 71 | else |
5b760e64 GS |
72 | section = kzalloc(array_size, GFP_KERNEL); |
73 | } else { | |
bb016b84 | 74 | section = memblock_virt_alloc_node(array_size, nid); |
5b760e64 | 75 | } |
28ae55c9 DH |
76 | |
77 | return section; | |
3e347261 | 78 | } |
802f192e | 79 | |
a3142c8e | 80 | static int __meminit sparse_index_init(unsigned long section_nr, int nid) |
802f192e | 81 | { |
28ae55c9 DH |
82 | unsigned long root = SECTION_NR_TO_ROOT(section_nr); |
83 | struct mem_section *section; | |
802f192e BP |
84 | |
85 | if (mem_section[root]) | |
28ae55c9 | 86 | return -EEXIST; |
3e347261 | 87 | |
28ae55c9 | 88 | section = sparse_index_alloc(nid); |
af0cd5a7 WC |
89 | if (!section) |
90 | return -ENOMEM; | |
28ae55c9 DH |
91 | |
92 | mem_section[root] = section; | |
c1c95183 | 93 | |
9d1936cf | 94 | return 0; |
28ae55c9 DH |
95 | } |
96 | #else /* !SPARSEMEM_EXTREME */ | |
97 | static inline int sparse_index_init(unsigned long section_nr, int nid) | |
98 | { | |
99 | return 0; | |
802f192e | 100 | } |
28ae55c9 DH |
101 | #endif |
102 | ||
91fd8b95 | 103 | #ifdef CONFIG_SPARSEMEM_EXTREME |
4ca644d9 DH |
104 | int __section_nr(struct mem_section* ms) |
105 | { | |
106 | unsigned long root_nr; | |
107 | struct mem_section* root; | |
108 | ||
12783b00 MK |
109 | for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) { |
110 | root = __nr_to_section(root_nr * SECTIONS_PER_ROOT); | |
4ca644d9 DH |
111 | if (!root) |
112 | continue; | |
113 | ||
114 | if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT))) | |
115 | break; | |
116 | } | |
117 | ||
db36a461 GS |
118 | VM_BUG_ON(root_nr == NR_SECTION_ROOTS); |
119 | ||
4ca644d9 DH |
120 | return (root_nr * SECTIONS_PER_ROOT) + (ms - root); |
121 | } | |
91fd8b95 ZC |
122 | #else |
123 | int __section_nr(struct mem_section* ms) | |
124 | { | |
125 | return (int)(ms - mem_section[0]); | |
126 | } | |
127 | #endif | |
4ca644d9 | 128 | |
30c253e6 AW |
129 | /* |
130 | * During early boot, before section_mem_map is used for an actual | |
131 | * mem_map, we use section_mem_map to store the section's NUMA | |
132 | * node. This keeps us from having to use another data structure. The | |
133 | * node information is cleared just before we store the real mem_map. | |
134 | */ | |
135 | static inline unsigned long sparse_encode_early_nid(int nid) | |
136 | { | |
137 | return (nid << SECTION_NID_SHIFT); | |
138 | } | |
139 | ||
140 | static inline int sparse_early_nid(struct mem_section *section) | |
141 | { | |
142 | return (section->section_mem_map >> SECTION_NID_SHIFT); | |
143 | } | |
144 | ||
2dbb51c4 MG |
145 | /* Validate the physical addressing limitations of the model */ |
146 | void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
147 | unsigned long *end_pfn) | |
d41dee36 | 148 | { |
2dbb51c4 | 149 | unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT); |
d41dee36 | 150 | |
bead9a3a IM |
151 | /* |
152 | * Sanity checks - do not allow an architecture to pass | |
153 | * in larger pfns than the maximum scope of sparsemem: | |
154 | */ | |
2dbb51c4 MG |
155 | if (*start_pfn > max_sparsemem_pfn) { |
156 | mminit_dprintk(MMINIT_WARNING, "pfnvalidation", | |
157 | "Start of range %lu -> %lu exceeds SPARSEMEM max %lu\n", | |
158 | *start_pfn, *end_pfn, max_sparsemem_pfn); | |
159 | WARN_ON_ONCE(1); | |
160 | *start_pfn = max_sparsemem_pfn; | |
161 | *end_pfn = max_sparsemem_pfn; | |
ef161a98 | 162 | } else if (*end_pfn > max_sparsemem_pfn) { |
2dbb51c4 MG |
163 | mminit_dprintk(MMINIT_WARNING, "pfnvalidation", |
164 | "End of range %lu -> %lu exceeds SPARSEMEM max %lu\n", | |
165 | *start_pfn, *end_pfn, max_sparsemem_pfn); | |
166 | WARN_ON_ONCE(1); | |
167 | *end_pfn = max_sparsemem_pfn; | |
168 | } | |
169 | } | |
170 | ||
171 | /* Record a memory area against a node. */ | |
172 | void __init memory_present(int nid, unsigned long start, unsigned long end) | |
173 | { | |
174 | unsigned long pfn; | |
bead9a3a | 175 | |
d41dee36 | 176 | start &= PAGE_SECTION_MASK; |
2dbb51c4 | 177 | mminit_validate_memmodel_limits(&start, &end); |
d41dee36 AW |
178 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) { |
179 | unsigned long section = pfn_to_section_nr(pfn); | |
802f192e BP |
180 | struct mem_section *ms; |
181 | ||
182 | sparse_index_init(section, nid); | |
85770ffe | 183 | set_section_nid(section, nid); |
802f192e BP |
184 | |
185 | ms = __nr_to_section(section); | |
186 | if (!ms->section_mem_map) | |
30c253e6 AW |
187 | ms->section_mem_map = sparse_encode_early_nid(nid) | |
188 | SECTION_MARKED_PRESENT; | |
d41dee36 AW |
189 | } |
190 | } | |
191 | ||
192 | /* | |
193 | * Only used by the i386 NUMA architecures, but relatively | |
194 | * generic code. | |
195 | */ | |
196 | unsigned long __init node_memmap_size_bytes(int nid, unsigned long start_pfn, | |
197 | unsigned long end_pfn) | |
198 | { | |
199 | unsigned long pfn; | |
200 | unsigned long nr_pages = 0; | |
201 | ||
2dbb51c4 | 202 | mminit_validate_memmodel_limits(&start_pfn, &end_pfn); |
d41dee36 AW |
203 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
204 | if (nid != early_pfn_to_nid(pfn)) | |
205 | continue; | |
206 | ||
540557b9 | 207 | if (pfn_present(pfn)) |
d41dee36 AW |
208 | nr_pages += PAGES_PER_SECTION; |
209 | } | |
210 | ||
211 | return nr_pages * sizeof(struct page); | |
212 | } | |
213 | ||
29751f69 AW |
214 | /* |
215 | * Subtle, we encode the real pfn into the mem_map such that | |
216 | * the identity pfn - section_mem_map will return the actual | |
217 | * physical page frame number. | |
218 | */ | |
219 | static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum) | |
220 | { | |
221 | return (unsigned long)(mem_map - (section_nr_to_pfn(pnum))); | |
222 | } | |
223 | ||
224 | /* | |
ea01ea93 | 225 | * Decode mem_map from the coded memmap |
29751f69 | 226 | */ |
29751f69 AW |
227 | struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum) |
228 | { | |
ea01ea93 BP |
229 | /* mask off the extra low bits of information */ |
230 | coded_mem_map &= SECTION_MAP_MASK; | |
29751f69 AW |
231 | return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum); |
232 | } | |
233 | ||
a3142c8e | 234 | static int __meminit sparse_init_one_section(struct mem_section *ms, |
5c0e3066 MG |
235 | unsigned long pnum, struct page *mem_map, |
236 | unsigned long *pageblock_bitmap) | |
29751f69 | 237 | { |
540557b9 | 238 | if (!present_section(ms)) |
29751f69 AW |
239 | return -EINVAL; |
240 | ||
30c253e6 | 241 | ms->section_mem_map &= ~SECTION_MAP_MASK; |
540557b9 AW |
242 | ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) | |
243 | SECTION_HAS_MEM_MAP; | |
5c0e3066 | 244 | ms->pageblock_flags = pageblock_bitmap; |
29751f69 AW |
245 | |
246 | return 1; | |
247 | } | |
248 | ||
04753278 | 249 | unsigned long usemap_size(void) |
5c0e3066 | 250 | { |
60a7a88d | 251 | return BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS) * sizeof(unsigned long); |
5c0e3066 MG |
252 | } |
253 | ||
254 | #ifdef CONFIG_MEMORY_HOTPLUG | |
255 | static unsigned long *__kmalloc_section_usemap(void) | |
256 | { | |
257 | return kmalloc(usemap_size(), GFP_KERNEL); | |
258 | } | |
259 | #endif /* CONFIG_MEMORY_HOTPLUG */ | |
260 | ||
48c90682 YG |
261 | #ifdef CONFIG_MEMORY_HOTREMOVE |
262 | static unsigned long * __init | |
a4322e1b | 263 | sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat, |
238305bb | 264 | unsigned long size) |
48c90682 | 265 | { |
99ab7b19 YL |
266 | unsigned long goal, limit; |
267 | unsigned long *p; | |
268 | int nid; | |
48c90682 YG |
269 | /* |
270 | * A page may contain usemaps for other sections preventing the | |
271 | * page being freed and making a section unremovable while | |
c800bcd5 | 272 | * other sections referencing the usemap remain active. Similarly, |
48c90682 YG |
273 | * a pgdat can prevent a section being removed. If section A |
274 | * contains a pgdat and section B contains the usemap, both | |
275 | * sections become inter-dependent. This allocates usemaps | |
276 | * from the same section as the pgdat where possible to avoid | |
277 | * this problem. | |
278 | */ | |
07b4e2bc | 279 | goal = __pa(pgdat) & (PAGE_SECTION_MASK << PAGE_SHIFT); |
99ab7b19 YL |
280 | limit = goal + (1UL << PA_SECTION_SHIFT); |
281 | nid = early_pfn_to_nid(goal >> PAGE_SHIFT); | |
282 | again: | |
bb016b84 SS |
283 | p = memblock_virt_alloc_try_nid_nopanic(size, |
284 | SMP_CACHE_BYTES, goal, limit, | |
285 | nid); | |
99ab7b19 YL |
286 | if (!p && limit) { |
287 | limit = 0; | |
288 | goto again; | |
289 | } | |
290 | return p; | |
48c90682 YG |
291 | } |
292 | ||
293 | static void __init check_usemap_section_nr(int nid, unsigned long *usemap) | |
294 | { | |
295 | unsigned long usemap_snr, pgdat_snr; | |
296 | static unsigned long old_usemap_snr = NR_MEM_SECTIONS; | |
297 | static unsigned long old_pgdat_snr = NR_MEM_SECTIONS; | |
298 | struct pglist_data *pgdat = NODE_DATA(nid); | |
299 | int usemap_nid; | |
300 | ||
301 | usemap_snr = pfn_to_section_nr(__pa(usemap) >> PAGE_SHIFT); | |
302 | pgdat_snr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT); | |
303 | if (usemap_snr == pgdat_snr) | |
304 | return; | |
305 | ||
306 | if (old_usemap_snr == usemap_snr && old_pgdat_snr == pgdat_snr) | |
307 | /* skip redundant message */ | |
308 | return; | |
309 | ||
310 | old_usemap_snr = usemap_snr; | |
311 | old_pgdat_snr = pgdat_snr; | |
312 | ||
313 | usemap_nid = sparse_early_nid(__nr_to_section(usemap_snr)); | |
314 | if (usemap_nid != nid) { | |
1170532b JP |
315 | pr_info("node %d must be removed before remove section %ld\n", |
316 | nid, usemap_snr); | |
48c90682 YG |
317 | return; |
318 | } | |
319 | /* | |
320 | * There is a circular dependency. | |
321 | * Some platforms allow un-removable section because they will just | |
322 | * gather other removable sections for dynamic partitioning. | |
323 | * Just notify un-removable section's number here. | |
324 | */ | |
1170532b JP |
325 | pr_info("Section %ld and %ld (node %d) have a circular dependency on usemap and pgdat allocations\n", |
326 | usemap_snr, pgdat_snr, nid); | |
48c90682 YG |
327 | } |
328 | #else | |
329 | static unsigned long * __init | |
a4322e1b | 330 | sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat, |
238305bb | 331 | unsigned long size) |
48c90682 | 332 | { |
bb016b84 | 333 | return memblock_virt_alloc_node_nopanic(size, pgdat->node_id); |
48c90682 YG |
334 | } |
335 | ||
336 | static void __init check_usemap_section_nr(int nid, unsigned long *usemap) | |
337 | { | |
338 | } | |
339 | #endif /* CONFIG_MEMORY_HOTREMOVE */ | |
340 | ||
18732093 | 341 | static void __init sparse_early_usemaps_alloc_node(void *data, |
a4322e1b YL |
342 | unsigned long pnum_begin, |
343 | unsigned long pnum_end, | |
344 | unsigned long usemap_count, int nodeid) | |
5c0e3066 | 345 | { |
a4322e1b YL |
346 | void *usemap; |
347 | unsigned long pnum; | |
18732093 | 348 | unsigned long **usemap_map = (unsigned long **)data; |
a4322e1b | 349 | int size = usemap_size(); |
5c0e3066 | 350 | |
a4322e1b | 351 | usemap = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nodeid), |
238305bb | 352 | size * usemap_count); |
f5bf18fa | 353 | if (!usemap) { |
1170532b | 354 | pr_warn("%s: allocation failed\n", __func__); |
238305bb | 355 | return; |
48c90682 YG |
356 | } |
357 | ||
f5bf18fa NA |
358 | for (pnum = pnum_begin; pnum < pnum_end; pnum++) { |
359 | if (!present_section_nr(pnum)) | |
360 | continue; | |
361 | usemap_map[pnum] = usemap; | |
362 | usemap += size; | |
363 | check_usemap_section_nr(nodeid, usemap_map[pnum]); | |
a4322e1b | 364 | } |
5c0e3066 MG |
365 | } |
366 | ||
8f6aac41 | 367 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
98f3cfc1 | 368 | struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid) |
29751f69 AW |
369 | { |
370 | struct page *map; | |
e48e67e0 | 371 | unsigned long size; |
29751f69 AW |
372 | |
373 | map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION); | |
374 | if (map) | |
375 | return map; | |
376 | ||
e48e67e0 | 377 | size = PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION); |
bb016b84 SS |
378 | map = memblock_virt_alloc_try_nid(size, |
379 | PAGE_SIZE, __pa(MAX_DMA_ADDRESS), | |
380 | BOOTMEM_ALLOC_ACCESSIBLE, nid); | |
8f6aac41 CL |
381 | return map; |
382 | } | |
9bdac914 YL |
383 | void __init sparse_mem_maps_populate_node(struct page **map_map, |
384 | unsigned long pnum_begin, | |
385 | unsigned long pnum_end, | |
386 | unsigned long map_count, int nodeid) | |
387 | { | |
388 | void *map; | |
389 | unsigned long pnum; | |
390 | unsigned long size = sizeof(struct page) * PAGES_PER_SECTION; | |
391 | ||
392 | map = alloc_remap(nodeid, size * map_count); | |
393 | if (map) { | |
394 | for (pnum = pnum_begin; pnum < pnum_end; pnum++) { | |
395 | if (!present_section_nr(pnum)) | |
396 | continue; | |
397 | map_map[pnum] = map; | |
398 | map += size; | |
399 | } | |
400 | return; | |
401 | } | |
402 | ||
403 | size = PAGE_ALIGN(size); | |
bb016b84 SS |
404 | map = memblock_virt_alloc_try_nid(size * map_count, |
405 | PAGE_SIZE, __pa(MAX_DMA_ADDRESS), | |
406 | BOOTMEM_ALLOC_ACCESSIBLE, nodeid); | |
9bdac914 YL |
407 | if (map) { |
408 | for (pnum = pnum_begin; pnum < pnum_end; pnum++) { | |
409 | if (!present_section_nr(pnum)) | |
410 | continue; | |
411 | map_map[pnum] = map; | |
412 | map += size; | |
413 | } | |
414 | return; | |
415 | } | |
416 | ||
417 | /* fallback */ | |
418 | for (pnum = pnum_begin; pnum < pnum_end; pnum++) { | |
419 | struct mem_section *ms; | |
420 | ||
421 | if (!present_section_nr(pnum)) | |
422 | continue; | |
423 | map_map[pnum] = sparse_mem_map_populate(pnum, nodeid); | |
424 | if (map_map[pnum]) | |
425 | continue; | |
426 | ms = __nr_to_section(pnum); | |
1170532b | 427 | pr_err("%s: sparsemem memory map backing failed some memory will not be available\n", |
756a025f | 428 | __func__); |
9bdac914 YL |
429 | ms->section_mem_map = 0; |
430 | } | |
431 | } | |
8f6aac41 CL |
432 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ |
433 | ||
81d0d950 | 434 | #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER |
18732093 | 435 | static void __init sparse_early_mem_maps_alloc_node(void *data, |
9bdac914 YL |
436 | unsigned long pnum_begin, |
437 | unsigned long pnum_end, | |
438 | unsigned long map_count, int nodeid) | |
439 | { | |
18732093 | 440 | struct page **map_map = (struct page **)data; |
9bdac914 YL |
441 | sparse_mem_maps_populate_node(map_map, pnum_begin, pnum_end, |
442 | map_count, nodeid); | |
443 | } | |
81d0d950 | 444 | #else |
9e5c6da7 | 445 | static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum) |
8f6aac41 CL |
446 | { |
447 | struct page *map; | |
448 | struct mem_section *ms = __nr_to_section(pnum); | |
449 | int nid = sparse_early_nid(ms); | |
450 | ||
98f3cfc1 | 451 | map = sparse_mem_map_populate(pnum, nid); |
29751f69 AW |
452 | if (map) |
453 | return map; | |
454 | ||
1170532b | 455 | pr_err("%s: sparsemem memory map backing failed some memory will not be available\n", |
756a025f | 456 | __func__); |
802f192e | 457 | ms->section_mem_map = 0; |
29751f69 AW |
458 | return NULL; |
459 | } | |
9bdac914 | 460 | #endif |
29751f69 | 461 | |
3b32123d | 462 | void __weak __meminit vmemmap_populate_print_last(void) |
c2b91e2e YL |
463 | { |
464 | } | |
a4322e1b | 465 | |
18732093 WL |
466 | /** |
467 | * alloc_usemap_and_memmap - memory alloction for pageblock flags and vmemmap | |
468 | * @map: usemap_map for pageblock flags or mmap_map for vmemmap | |
469 | */ | |
470 | static void __init alloc_usemap_and_memmap(void (*alloc_func) | |
471 | (void *, unsigned long, unsigned long, | |
472 | unsigned long, int), void *data) | |
473 | { | |
474 | unsigned long pnum; | |
475 | unsigned long map_count; | |
476 | int nodeid_begin = 0; | |
477 | unsigned long pnum_begin = 0; | |
478 | ||
479 | for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { | |
480 | struct mem_section *ms; | |
481 | ||
482 | if (!present_section_nr(pnum)) | |
483 | continue; | |
484 | ms = __nr_to_section(pnum); | |
485 | nodeid_begin = sparse_early_nid(ms); | |
486 | pnum_begin = pnum; | |
487 | break; | |
488 | } | |
489 | map_count = 1; | |
490 | for (pnum = pnum_begin + 1; pnum < NR_MEM_SECTIONS; pnum++) { | |
491 | struct mem_section *ms; | |
492 | int nodeid; | |
493 | ||
494 | if (!present_section_nr(pnum)) | |
495 | continue; | |
496 | ms = __nr_to_section(pnum); | |
497 | nodeid = sparse_early_nid(ms); | |
498 | if (nodeid == nodeid_begin) { | |
499 | map_count++; | |
500 | continue; | |
501 | } | |
502 | /* ok, we need to take cake of from pnum_begin to pnum - 1*/ | |
503 | alloc_func(data, pnum_begin, pnum, | |
504 | map_count, nodeid_begin); | |
505 | /* new start, update count etc*/ | |
506 | nodeid_begin = nodeid; | |
507 | pnum_begin = pnum; | |
508 | map_count = 1; | |
509 | } | |
510 | /* ok, last chunk */ | |
511 | alloc_func(data, pnum_begin, NR_MEM_SECTIONS, | |
512 | map_count, nodeid_begin); | |
513 | } | |
514 | ||
193faea9 SR |
515 | /* |
516 | * Allocate the accumulated non-linear sections, allocate a mem_map | |
517 | * for each and record the physical to section mapping. | |
518 | */ | |
519 | void __init sparse_init(void) | |
520 | { | |
521 | unsigned long pnum; | |
522 | struct page *map; | |
5c0e3066 | 523 | unsigned long *usemap; |
e123dd3f | 524 | unsigned long **usemap_map; |
81d0d950 | 525 | int size; |
81d0d950 | 526 | #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER |
81d0d950 YL |
527 | int size2; |
528 | struct page **map_map; | |
529 | #endif | |
e123dd3f | 530 | |
55878e88 CS |
531 | /* see include/linux/mmzone.h 'struct mem_section' definition */ |
532 | BUILD_BUG_ON(!is_power_of_2(sizeof(struct mem_section))); | |
533 | ||
ca57df79 XQ |
534 | /* Setup pageblock_order for HUGETLB_PAGE_SIZE_VARIABLE */ |
535 | set_pageblock_order(); | |
536 | ||
e123dd3f YL |
537 | /* |
538 | * map is using big page (aka 2M in x86 64 bit) | |
539 | * usemap is less one page (aka 24 bytes) | |
540 | * so alloc 2M (with 2M align) and 24 bytes in turn will | |
541 | * make next 2M slip to one more 2M later. | |
542 | * then in big system, the memory will have a lot of holes... | |
25985edc | 543 | * here try to allocate 2M pages continuously. |
e123dd3f YL |
544 | * |
545 | * powerpc need to call sparse_init_one_section right after each | |
546 | * sparse_early_mem_map_alloc, so allocate usemap_map at first. | |
547 | */ | |
548 | size = sizeof(unsigned long *) * NR_MEM_SECTIONS; | |
bb016b84 | 549 | usemap_map = memblock_virt_alloc(size, 0); |
e123dd3f YL |
550 | if (!usemap_map) |
551 | panic("can not allocate usemap_map\n"); | |
18732093 WL |
552 | alloc_usemap_and_memmap(sparse_early_usemaps_alloc_node, |
553 | (void *)usemap_map); | |
193faea9 | 554 | |
9bdac914 YL |
555 | #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER |
556 | size2 = sizeof(struct page *) * NR_MEM_SECTIONS; | |
bb016b84 | 557 | map_map = memblock_virt_alloc(size2, 0); |
9bdac914 YL |
558 | if (!map_map) |
559 | panic("can not allocate map_map\n"); | |
18732093 WL |
560 | alloc_usemap_and_memmap(sparse_early_mem_maps_alloc_node, |
561 | (void *)map_map); | |
9bdac914 YL |
562 | #endif |
563 | ||
e123dd3f YL |
564 | for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { |
565 | if (!present_section_nr(pnum)) | |
193faea9 | 566 | continue; |
5c0e3066 | 567 | |
e123dd3f | 568 | usemap = usemap_map[pnum]; |
5c0e3066 MG |
569 | if (!usemap) |
570 | continue; | |
571 | ||
9bdac914 YL |
572 | #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER |
573 | map = map_map[pnum]; | |
574 | #else | |
e123dd3f | 575 | map = sparse_early_mem_map_alloc(pnum); |
9bdac914 | 576 | #endif |
e123dd3f YL |
577 | if (!map) |
578 | continue; | |
579 | ||
5c0e3066 MG |
580 | sparse_init_one_section(__nr_to_section(pnum), pnum, map, |
581 | usemap); | |
193faea9 | 582 | } |
e123dd3f | 583 | |
c2b91e2e YL |
584 | vmemmap_populate_print_last(); |
585 | ||
9bdac914 | 586 | #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER |
bb016b84 | 587 | memblock_free_early(__pa(map_map), size2); |
9bdac914 | 588 | #endif |
bb016b84 | 589 | memblock_free_early(__pa(usemap_map), size); |
193faea9 SR |
590 | } |
591 | ||
592 | #ifdef CONFIG_MEMORY_HOTPLUG | |
98f3cfc1 | 593 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
85b35fea | 594 | static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid) |
98f3cfc1 YG |
595 | { |
596 | /* This will make the necessary allocations eventually. */ | |
597 | return sparse_mem_map_populate(pnum, nid); | |
598 | } | |
85b35fea | 599 | static void __kfree_section_memmap(struct page *memmap) |
98f3cfc1 | 600 | { |
0aad818b | 601 | unsigned long start = (unsigned long)memmap; |
85b35fea | 602 | unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION); |
0aad818b JW |
603 | |
604 | vmemmap_free(start, end); | |
98f3cfc1 | 605 | } |
4edd7cef | 606 | #ifdef CONFIG_MEMORY_HOTREMOVE |
81556b02 | 607 | static void free_map_bootmem(struct page *memmap) |
0c0a4a51 | 608 | { |
0aad818b | 609 | unsigned long start = (unsigned long)memmap; |
81556b02 | 610 | unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION); |
0aad818b JW |
611 | |
612 | vmemmap_free(start, end); | |
0c0a4a51 | 613 | } |
4edd7cef | 614 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
98f3cfc1 | 615 | #else |
85b35fea | 616 | static struct page *__kmalloc_section_memmap(void) |
0b0acbec DH |
617 | { |
618 | struct page *page, *ret; | |
85b35fea | 619 | unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION; |
0b0acbec | 620 | |
f2d0aa5b | 621 | page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size)); |
0b0acbec DH |
622 | if (page) |
623 | goto got_map_page; | |
624 | ||
625 | ret = vmalloc(memmap_size); | |
626 | if (ret) | |
627 | goto got_map_ptr; | |
628 | ||
629 | return NULL; | |
630 | got_map_page: | |
631 | ret = (struct page *)pfn_to_kaddr(page_to_pfn(page)); | |
632 | got_map_ptr: | |
0b0acbec DH |
633 | |
634 | return ret; | |
635 | } | |
636 | ||
85b35fea | 637 | static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid) |
98f3cfc1 | 638 | { |
85b35fea | 639 | return __kmalloc_section_memmap(); |
98f3cfc1 YG |
640 | } |
641 | ||
85b35fea | 642 | static void __kfree_section_memmap(struct page *memmap) |
0b0acbec | 643 | { |
9e2779fa | 644 | if (is_vmalloc_addr(memmap)) |
0b0acbec DH |
645 | vfree(memmap); |
646 | else | |
647 | free_pages((unsigned long)memmap, | |
85b35fea | 648 | get_order(sizeof(struct page) * PAGES_PER_SECTION)); |
0b0acbec | 649 | } |
0c0a4a51 | 650 | |
4edd7cef | 651 | #ifdef CONFIG_MEMORY_HOTREMOVE |
81556b02 | 652 | static void free_map_bootmem(struct page *memmap) |
0c0a4a51 YG |
653 | { |
654 | unsigned long maps_section_nr, removing_section_nr, i; | |
81556b02 | 655 | unsigned long magic, nr_pages; |
ae64ffca | 656 | struct page *page = virt_to_page(memmap); |
0c0a4a51 | 657 | |
81556b02 ZY |
658 | nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page)) |
659 | >> PAGE_SHIFT; | |
660 | ||
0c0a4a51 | 661 | for (i = 0; i < nr_pages; i++, page++) { |
ddffe98d | 662 | magic = (unsigned long) page->freelist; |
0c0a4a51 YG |
663 | |
664 | BUG_ON(magic == NODE_INFO); | |
665 | ||
666 | maps_section_nr = pfn_to_section_nr(page_to_pfn(page)); | |
857e522a | 667 | removing_section_nr = page_private(page); |
0c0a4a51 YG |
668 | |
669 | /* | |
670 | * When this function is called, the removing section is | |
671 | * logical offlined state. This means all pages are isolated | |
672 | * from page allocator. If removing section's memmap is placed | |
673 | * on the same section, it must not be freed. | |
674 | * If it is freed, page allocator may allocate it which will | |
675 | * be removed physically soon. | |
676 | */ | |
677 | if (maps_section_nr != removing_section_nr) | |
678 | put_page_bootmem(page); | |
679 | } | |
680 | } | |
4edd7cef | 681 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
98f3cfc1 | 682 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
0b0acbec | 683 | |
29751f69 AW |
684 | /* |
685 | * returns the number of sections whose mem_maps were properly | |
686 | * set. If this is <=0, then that means that the passed-in | |
687 | * map was not consumed and must be freed. | |
688 | */ | |
85b35fea | 689 | int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn) |
29751f69 | 690 | { |
0b0acbec DH |
691 | unsigned long section_nr = pfn_to_section_nr(start_pfn); |
692 | struct pglist_data *pgdat = zone->zone_pgdat; | |
693 | struct mem_section *ms; | |
694 | struct page *memmap; | |
5c0e3066 | 695 | unsigned long *usemap; |
0b0acbec DH |
696 | unsigned long flags; |
697 | int ret; | |
29751f69 | 698 | |
0b0acbec DH |
699 | /* |
700 | * no locking for this, because it does its own | |
701 | * plus, it does a kmalloc | |
702 | */ | |
bbd06825 WC |
703 | ret = sparse_index_init(section_nr, pgdat->node_id); |
704 | if (ret < 0 && ret != -EEXIST) | |
705 | return ret; | |
85b35fea | 706 | memmap = kmalloc_section_memmap(section_nr, pgdat->node_id); |
bbd06825 WC |
707 | if (!memmap) |
708 | return -ENOMEM; | |
5c0e3066 | 709 | usemap = __kmalloc_section_usemap(); |
bbd06825 | 710 | if (!usemap) { |
85b35fea | 711 | __kfree_section_memmap(memmap); |
bbd06825 WC |
712 | return -ENOMEM; |
713 | } | |
0b0acbec DH |
714 | |
715 | pgdat_resize_lock(pgdat, &flags); | |
29751f69 | 716 | |
0b0acbec DH |
717 | ms = __pfn_to_section(start_pfn); |
718 | if (ms->section_mem_map & SECTION_MARKED_PRESENT) { | |
719 | ret = -EEXIST; | |
720 | goto out; | |
721 | } | |
5c0e3066 | 722 | |
85b35fea | 723 | memset(memmap, 0, sizeof(struct page) * PAGES_PER_SECTION); |
3ac19f8e | 724 | |
29751f69 AW |
725 | ms->section_mem_map |= SECTION_MARKED_PRESENT; |
726 | ||
5c0e3066 | 727 | ret = sparse_init_one_section(ms, section_nr, memmap, usemap); |
0b0acbec | 728 | |
0b0acbec DH |
729 | out: |
730 | pgdat_resize_unlock(pgdat, &flags); | |
bbd06825 WC |
731 | if (ret <= 0) { |
732 | kfree(usemap); | |
85b35fea | 733 | __kfree_section_memmap(memmap); |
bbd06825 | 734 | } |
0b0acbec | 735 | return ret; |
29751f69 | 736 | } |
ea01ea93 | 737 | |
f3deb687 | 738 | #ifdef CONFIG_MEMORY_HOTREMOVE |
95a4774d WC |
739 | #ifdef CONFIG_MEMORY_FAILURE |
740 | static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages) | |
741 | { | |
742 | int i; | |
743 | ||
744 | if (!memmap) | |
745 | return; | |
746 | ||
4b94ffdc | 747 | for (i = 0; i < nr_pages; i++) { |
95a4774d | 748 | if (PageHWPoison(&memmap[i])) { |
293c07e3 | 749 | atomic_long_sub(1, &num_poisoned_pages); |
95a4774d WC |
750 | ClearPageHWPoison(&memmap[i]); |
751 | } | |
752 | } | |
753 | } | |
754 | #else | |
755 | static inline void clear_hwpoisoned_pages(struct page *memmap, int nr_pages) | |
756 | { | |
757 | } | |
758 | #endif | |
759 | ||
4edd7cef DR |
760 | static void free_section_usemap(struct page *memmap, unsigned long *usemap) |
761 | { | |
762 | struct page *usemap_page; | |
4edd7cef DR |
763 | |
764 | if (!usemap) | |
765 | return; | |
766 | ||
767 | usemap_page = virt_to_page(usemap); | |
768 | /* | |
769 | * Check to see if allocation came from hot-plug-add | |
770 | */ | |
771 | if (PageSlab(usemap_page) || PageCompound(usemap_page)) { | |
772 | kfree(usemap); | |
773 | if (memmap) | |
85b35fea | 774 | __kfree_section_memmap(memmap); |
4edd7cef DR |
775 | return; |
776 | } | |
777 | ||
778 | /* | |
779 | * The usemap came from bootmem. This is packed with other usemaps | |
780 | * on the section which has pgdat at boot time. Just keep it as is now. | |
781 | */ | |
782 | ||
81556b02 ZY |
783 | if (memmap) |
784 | free_map_bootmem(memmap); | |
4edd7cef DR |
785 | } |
786 | ||
4b94ffdc DW |
787 | void sparse_remove_one_section(struct zone *zone, struct mem_section *ms, |
788 | unsigned long map_offset) | |
ea01ea93 BP |
789 | { |
790 | struct page *memmap = NULL; | |
cd099682 TC |
791 | unsigned long *usemap = NULL, flags; |
792 | struct pglist_data *pgdat = zone->zone_pgdat; | |
ea01ea93 | 793 | |
cd099682 | 794 | pgdat_resize_lock(pgdat, &flags); |
ea01ea93 BP |
795 | if (ms->section_mem_map) { |
796 | usemap = ms->pageblock_flags; | |
797 | memmap = sparse_decode_mem_map(ms->section_mem_map, | |
798 | __section_nr(ms)); | |
799 | ms->section_mem_map = 0; | |
800 | ms->pageblock_flags = NULL; | |
801 | } | |
cd099682 | 802 | pgdat_resize_unlock(pgdat, &flags); |
ea01ea93 | 803 | |
4b94ffdc DW |
804 | clear_hwpoisoned_pages(memmap + map_offset, |
805 | PAGES_PER_SECTION - map_offset); | |
ea01ea93 BP |
806 | free_section_usemap(memmap, usemap); |
807 | } | |
4edd7cef DR |
808 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
809 | #endif /* CONFIG_MEMORY_HOTPLUG */ |