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Commit | Line | Data |
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d41dee36 AW |
1 | /* |
2 | * sparse memory mappings. | |
3 | */ | |
d41dee36 AW |
4 | #include <linux/mm.h> |
5 | #include <linux/mmzone.h> | |
6 | #include <linux/bootmem.h> | |
0b0acbec | 7 | #include <linux/highmem.h> |
d41dee36 | 8 | #include <linux/module.h> |
28ae55c9 | 9 | #include <linux/spinlock.h> |
0b0acbec | 10 | #include <linux/vmalloc.h> |
0c0a4a51 | 11 | #include "internal.h" |
d41dee36 | 12 | #include <asm/dma.h> |
8f6aac41 CL |
13 | #include <asm/pgalloc.h> |
14 | #include <asm/pgtable.h> | |
d41dee36 AW |
15 | |
16 | /* | |
17 | * Permanent SPARSEMEM data: | |
18 | * | |
19 | * 1) mem_section - memory sections, mem_map's for valid memory | |
20 | */ | |
3e347261 | 21 | #ifdef CONFIG_SPARSEMEM_EXTREME |
802f192e | 22 | struct mem_section *mem_section[NR_SECTION_ROOTS] |
22fc6ecc | 23 | ____cacheline_internodealigned_in_smp; |
3e347261 BP |
24 | #else |
25 | struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT] | |
22fc6ecc | 26 | ____cacheline_internodealigned_in_smp; |
3e347261 BP |
27 | #endif |
28 | EXPORT_SYMBOL(mem_section); | |
29 | ||
89689ae7 CL |
30 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
31 | /* | |
32 | * If we did not store the node number in the page then we have to | |
33 | * do a lookup in the section_to_node_table in order to find which | |
34 | * node the page belongs to. | |
35 | */ | |
36 | #if MAX_NUMNODES <= 256 | |
37 | static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; | |
38 | #else | |
39 | static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; | |
40 | #endif | |
41 | ||
25ba77c1 | 42 | int page_to_nid(struct page *page) |
89689ae7 CL |
43 | { |
44 | return section_to_node_table[page_to_section(page)]; | |
45 | } | |
46 | EXPORT_SYMBOL(page_to_nid); | |
85770ffe AW |
47 | |
48 | static void set_section_nid(unsigned long section_nr, int nid) | |
49 | { | |
50 | section_to_node_table[section_nr] = nid; | |
51 | } | |
52 | #else /* !NODE_NOT_IN_PAGE_FLAGS */ | |
53 | static inline void set_section_nid(unsigned long section_nr, int nid) | |
54 | { | |
55 | } | |
89689ae7 CL |
56 | #endif |
57 | ||
3e347261 | 58 | #ifdef CONFIG_SPARSEMEM_EXTREME |
577a32f6 | 59 | static struct mem_section noinline __init_refok *sparse_index_alloc(int nid) |
28ae55c9 DH |
60 | { |
61 | struct mem_section *section = NULL; | |
62 | unsigned long array_size = SECTIONS_PER_ROOT * | |
63 | sizeof(struct mem_section); | |
64 | ||
f52407ce SL |
65 | if (slab_is_available()) { |
66 | if (node_state(nid, N_HIGH_MEMORY)) | |
67 | section = kmalloc_node(array_size, GFP_KERNEL, nid); | |
68 | else | |
69 | section = kmalloc(array_size, GFP_KERNEL); | |
70 | } else | |
46a66eec | 71 | section = alloc_bootmem_node(NODE_DATA(nid), array_size); |
28ae55c9 DH |
72 | |
73 | if (section) | |
74 | memset(section, 0, array_size); | |
75 | ||
76 | return section; | |
3e347261 | 77 | } |
802f192e | 78 | |
a3142c8e | 79 | static int __meminit sparse_index_init(unsigned long section_nr, int nid) |
802f192e | 80 | { |
34af946a | 81 | static DEFINE_SPINLOCK(index_init_lock); |
28ae55c9 DH |
82 | unsigned long root = SECTION_NR_TO_ROOT(section_nr); |
83 | struct mem_section *section; | |
84 | int ret = 0; | |
802f192e BP |
85 | |
86 | if (mem_section[root]) | |
28ae55c9 | 87 | return -EEXIST; |
3e347261 | 88 | |
28ae55c9 | 89 | section = sparse_index_alloc(nid); |
af0cd5a7 WC |
90 | if (!section) |
91 | return -ENOMEM; | |
28ae55c9 DH |
92 | /* |
93 | * This lock keeps two different sections from | |
94 | * reallocating for the same index | |
95 | */ | |
96 | spin_lock(&index_init_lock); | |
3e347261 | 97 | |
28ae55c9 DH |
98 | if (mem_section[root]) { |
99 | ret = -EEXIST; | |
100 | goto out; | |
101 | } | |
102 | ||
103 | mem_section[root] = section; | |
104 | out: | |
105 | spin_unlock(&index_init_lock); | |
106 | return ret; | |
107 | } | |
108 | #else /* !SPARSEMEM_EXTREME */ | |
109 | static inline int sparse_index_init(unsigned long section_nr, int nid) | |
110 | { | |
111 | return 0; | |
802f192e | 112 | } |
28ae55c9 DH |
113 | #endif |
114 | ||
4ca644d9 DH |
115 | /* |
116 | * Although written for the SPARSEMEM_EXTREME case, this happens | |
cd881a6b | 117 | * to also work for the flat array case because |
4ca644d9 DH |
118 | * NR_SECTION_ROOTS==NR_MEM_SECTIONS. |
119 | */ | |
120 | int __section_nr(struct mem_section* ms) | |
121 | { | |
122 | unsigned long root_nr; | |
123 | struct mem_section* root; | |
124 | ||
12783b00 MK |
125 | for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) { |
126 | root = __nr_to_section(root_nr * SECTIONS_PER_ROOT); | |
4ca644d9 DH |
127 | if (!root) |
128 | continue; | |
129 | ||
130 | if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT))) | |
131 | break; | |
132 | } | |
133 | ||
134 | return (root_nr * SECTIONS_PER_ROOT) + (ms - root); | |
135 | } | |
136 | ||
30c253e6 AW |
137 | /* |
138 | * During early boot, before section_mem_map is used for an actual | |
139 | * mem_map, we use section_mem_map to store the section's NUMA | |
140 | * node. This keeps us from having to use another data structure. The | |
141 | * node information is cleared just before we store the real mem_map. | |
142 | */ | |
143 | static inline unsigned long sparse_encode_early_nid(int nid) | |
144 | { | |
145 | return (nid << SECTION_NID_SHIFT); | |
146 | } | |
147 | ||
148 | static inline int sparse_early_nid(struct mem_section *section) | |
149 | { | |
150 | return (section->section_mem_map >> SECTION_NID_SHIFT); | |
151 | } | |
152 | ||
2dbb51c4 MG |
153 | /* Validate the physical addressing limitations of the model */ |
154 | void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
155 | unsigned long *end_pfn) | |
d41dee36 | 156 | { |
2dbb51c4 | 157 | unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT); |
d41dee36 | 158 | |
bead9a3a IM |
159 | /* |
160 | * Sanity checks - do not allow an architecture to pass | |
161 | * in larger pfns than the maximum scope of sparsemem: | |
162 | */ | |
2dbb51c4 MG |
163 | if (*start_pfn > max_sparsemem_pfn) { |
164 | mminit_dprintk(MMINIT_WARNING, "pfnvalidation", | |
165 | "Start of range %lu -> %lu exceeds SPARSEMEM max %lu\n", | |
166 | *start_pfn, *end_pfn, max_sparsemem_pfn); | |
167 | WARN_ON_ONCE(1); | |
168 | *start_pfn = max_sparsemem_pfn; | |
169 | *end_pfn = max_sparsemem_pfn; | |
ef161a98 | 170 | } else if (*end_pfn > max_sparsemem_pfn) { |
2dbb51c4 MG |
171 | mminit_dprintk(MMINIT_WARNING, "pfnvalidation", |
172 | "End of range %lu -> %lu exceeds SPARSEMEM max %lu\n", | |
173 | *start_pfn, *end_pfn, max_sparsemem_pfn); | |
174 | WARN_ON_ONCE(1); | |
175 | *end_pfn = max_sparsemem_pfn; | |
176 | } | |
177 | } | |
178 | ||
179 | /* Record a memory area against a node. */ | |
180 | void __init memory_present(int nid, unsigned long start, unsigned long end) | |
181 | { | |
182 | unsigned long pfn; | |
bead9a3a | 183 | |
d41dee36 | 184 | start &= PAGE_SECTION_MASK; |
2dbb51c4 | 185 | mminit_validate_memmodel_limits(&start, &end); |
d41dee36 AW |
186 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) { |
187 | unsigned long section = pfn_to_section_nr(pfn); | |
802f192e BP |
188 | struct mem_section *ms; |
189 | ||
190 | sparse_index_init(section, nid); | |
85770ffe | 191 | set_section_nid(section, nid); |
802f192e BP |
192 | |
193 | ms = __nr_to_section(section); | |
194 | if (!ms->section_mem_map) | |
30c253e6 AW |
195 | ms->section_mem_map = sparse_encode_early_nid(nid) | |
196 | SECTION_MARKED_PRESENT; | |
d41dee36 AW |
197 | } |
198 | } | |
199 | ||
200 | /* | |
201 | * Only used by the i386 NUMA architecures, but relatively | |
202 | * generic code. | |
203 | */ | |
204 | unsigned long __init node_memmap_size_bytes(int nid, unsigned long start_pfn, | |
205 | unsigned long end_pfn) | |
206 | { | |
207 | unsigned long pfn; | |
208 | unsigned long nr_pages = 0; | |
209 | ||
2dbb51c4 | 210 | mminit_validate_memmodel_limits(&start_pfn, &end_pfn); |
d41dee36 AW |
211 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
212 | if (nid != early_pfn_to_nid(pfn)) | |
213 | continue; | |
214 | ||
540557b9 | 215 | if (pfn_present(pfn)) |
d41dee36 AW |
216 | nr_pages += PAGES_PER_SECTION; |
217 | } | |
218 | ||
219 | return nr_pages * sizeof(struct page); | |
220 | } | |
221 | ||
29751f69 AW |
222 | /* |
223 | * Subtle, we encode the real pfn into the mem_map such that | |
224 | * the identity pfn - section_mem_map will return the actual | |
225 | * physical page frame number. | |
226 | */ | |
227 | static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum) | |
228 | { | |
229 | return (unsigned long)(mem_map - (section_nr_to_pfn(pnum))); | |
230 | } | |
231 | ||
232 | /* | |
ea01ea93 | 233 | * Decode mem_map from the coded memmap |
29751f69 | 234 | */ |
29751f69 AW |
235 | struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum) |
236 | { | |
ea01ea93 BP |
237 | /* mask off the extra low bits of information */ |
238 | coded_mem_map &= SECTION_MAP_MASK; | |
29751f69 AW |
239 | return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum); |
240 | } | |
241 | ||
a3142c8e | 242 | static int __meminit sparse_init_one_section(struct mem_section *ms, |
5c0e3066 MG |
243 | unsigned long pnum, struct page *mem_map, |
244 | unsigned long *pageblock_bitmap) | |
29751f69 | 245 | { |
540557b9 | 246 | if (!present_section(ms)) |
29751f69 AW |
247 | return -EINVAL; |
248 | ||
30c253e6 | 249 | ms->section_mem_map &= ~SECTION_MAP_MASK; |
540557b9 AW |
250 | ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) | |
251 | SECTION_HAS_MEM_MAP; | |
5c0e3066 | 252 | ms->pageblock_flags = pageblock_bitmap; |
29751f69 AW |
253 | |
254 | return 1; | |
255 | } | |
256 | ||
04753278 | 257 | unsigned long usemap_size(void) |
5c0e3066 MG |
258 | { |
259 | unsigned long size_bytes; | |
260 | size_bytes = roundup(SECTION_BLOCKFLAGS_BITS, 8) / 8; | |
261 | size_bytes = roundup(size_bytes, sizeof(unsigned long)); | |
262 | return size_bytes; | |
263 | } | |
264 | ||
265 | #ifdef CONFIG_MEMORY_HOTPLUG | |
266 | static unsigned long *__kmalloc_section_usemap(void) | |
267 | { | |
268 | return kmalloc(usemap_size(), GFP_KERNEL); | |
269 | } | |
270 | #endif /* CONFIG_MEMORY_HOTPLUG */ | |
271 | ||
48c90682 YG |
272 | #ifdef CONFIG_MEMORY_HOTREMOVE |
273 | static unsigned long * __init | |
a4322e1b YL |
274 | sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat, |
275 | unsigned long count) | |
48c90682 YG |
276 | { |
277 | unsigned long section_nr; | |
278 | ||
279 | /* | |
280 | * A page may contain usemaps for other sections preventing the | |
281 | * page being freed and making a section unremovable while | |
282 | * other sections referencing the usemap retmain active. Similarly, | |
283 | * a pgdat can prevent a section being removed. If section A | |
284 | * contains a pgdat and section B contains the usemap, both | |
285 | * sections become inter-dependent. This allocates usemaps | |
286 | * from the same section as the pgdat where possible to avoid | |
287 | * this problem. | |
288 | */ | |
289 | section_nr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT); | |
a4322e1b | 290 | return alloc_bootmem_section(usemap_size() * count, section_nr); |
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) { | |
315 | printk(KERN_INFO | |
316 | "node %d must be removed before remove section %ld\n", | |
317 | nid, usemap_snr); | |
318 | return; | |
319 | } | |
320 | /* | |
321 | * There is a circular dependency. | |
322 | * Some platforms allow un-removable section because they will just | |
323 | * gather other removable sections for dynamic partitioning. | |
324 | * Just notify un-removable section's number here. | |
325 | */ | |
326 | printk(KERN_INFO "Section %ld and %ld (node %d)", usemap_snr, | |
327 | pgdat_snr, nid); | |
328 | printk(KERN_CONT | |
329 | " have a circular dependency on usemap and pgdat allocations\n"); | |
330 | } | |
331 | #else | |
332 | static unsigned long * __init | |
a4322e1b YL |
333 | sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat, |
334 | unsigned long count) | |
48c90682 YG |
335 | { |
336 | return NULL; | |
337 | } | |
338 | ||
339 | static void __init check_usemap_section_nr(int nid, unsigned long *usemap) | |
340 | { | |
341 | } | |
342 | #endif /* CONFIG_MEMORY_HOTREMOVE */ | |
343 | ||
a4322e1b YL |
344 | static void __init sparse_early_usemaps_alloc_node(unsigned long**usemap_map, |
345 | unsigned long pnum_begin, | |
346 | unsigned long pnum_end, | |
347 | unsigned long usemap_count, int nodeid) | |
5c0e3066 | 348 | { |
a4322e1b YL |
349 | void *usemap; |
350 | unsigned long pnum; | |
351 | int size = usemap_size(); | |
5c0e3066 | 352 | |
a4322e1b YL |
353 | usemap = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nodeid), |
354 | usemap_count); | |
48c90682 | 355 | if (usemap) { |
a4322e1b YL |
356 | for (pnum = pnum_begin; pnum < pnum_end; pnum++) { |
357 | if (!present_section_nr(pnum)) | |
358 | continue; | |
359 | usemap_map[pnum] = usemap; | |
360 | usemap += size; | |
361 | } | |
362 | return; | |
48c90682 YG |
363 | } |
364 | ||
a4322e1b YL |
365 | usemap = alloc_bootmem_node(NODE_DATA(nodeid), size * usemap_count); |
366 | if (usemap) { | |
367 | for (pnum = pnum_begin; pnum < pnum_end; pnum++) { | |
368 | if (!present_section_nr(pnum)) | |
369 | continue; | |
370 | usemap_map[pnum] = usemap; | |
371 | usemap += size; | |
372 | check_usemap_section_nr(nodeid, usemap_map[pnum]); | |
373 | } | |
374 | return; | |
375 | } | |
5c0e3066 | 376 | |
d40cee24 | 377 | printk(KERN_WARNING "%s: allocation failed\n", __func__); |
5c0e3066 MG |
378 | } |
379 | ||
8f6aac41 | 380 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
98f3cfc1 | 381 | struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid) |
29751f69 AW |
382 | { |
383 | struct page *map; | |
29751f69 AW |
384 | |
385 | map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION); | |
386 | if (map) | |
387 | return map; | |
388 | ||
9d99217a YG |
389 | map = alloc_bootmem_pages_node(NODE_DATA(nid), |
390 | PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION)); | |
8f6aac41 CL |
391 | return map; |
392 | } | |
9bdac914 YL |
393 | void __init sparse_mem_maps_populate_node(struct page **map_map, |
394 | unsigned long pnum_begin, | |
395 | unsigned long pnum_end, | |
396 | unsigned long map_count, int nodeid) | |
397 | { | |
398 | void *map; | |
399 | unsigned long pnum; | |
400 | unsigned long size = sizeof(struct page) * PAGES_PER_SECTION; | |
401 | ||
402 | map = alloc_remap(nodeid, size * map_count); | |
403 | if (map) { | |
404 | for (pnum = pnum_begin; pnum < pnum_end; pnum++) { | |
405 | if (!present_section_nr(pnum)) | |
406 | continue; | |
407 | map_map[pnum] = map; | |
408 | map += size; | |
409 | } | |
410 | return; | |
411 | } | |
412 | ||
413 | size = PAGE_ALIGN(size); | |
414 | map = alloc_bootmem_pages_node(NODE_DATA(nodeid), size * map_count); | |
415 | if (map) { | |
416 | for (pnum = pnum_begin; pnum < pnum_end; pnum++) { | |
417 | if (!present_section_nr(pnum)) | |
418 | continue; | |
419 | map_map[pnum] = map; | |
420 | map += size; | |
421 | } | |
422 | return; | |
423 | } | |
424 | ||
425 | /* fallback */ | |
426 | for (pnum = pnum_begin; pnum < pnum_end; pnum++) { | |
427 | struct mem_section *ms; | |
428 | ||
429 | if (!present_section_nr(pnum)) | |
430 | continue; | |
431 | map_map[pnum] = sparse_mem_map_populate(pnum, nodeid); | |
432 | if (map_map[pnum]) | |
433 | continue; | |
434 | ms = __nr_to_section(pnum); | |
435 | printk(KERN_ERR "%s: sparsemem memory map backing failed " | |
436 | "some memory will not be available.\n", __func__); | |
437 | ms->section_mem_map = 0; | |
438 | } | |
439 | } | |
8f6aac41 CL |
440 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ |
441 | ||
9bdac914 YL |
442 | static void __init sparse_early_mem_maps_alloc_node(struct page **map_map, |
443 | unsigned long pnum_begin, | |
444 | unsigned long pnum_end, | |
445 | unsigned long map_count, int nodeid) | |
446 | { | |
447 | sparse_mem_maps_populate_node(map_map, pnum_begin, pnum_end, | |
448 | map_count, nodeid); | |
449 | } | |
450 | ||
451 | #ifndef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER | |
9e5c6da7 | 452 | static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum) |
8f6aac41 CL |
453 | { |
454 | struct page *map; | |
455 | struct mem_section *ms = __nr_to_section(pnum); | |
456 | int nid = sparse_early_nid(ms); | |
457 | ||
98f3cfc1 | 458 | map = sparse_mem_map_populate(pnum, nid); |
29751f69 AW |
459 | if (map) |
460 | return map; | |
461 | ||
8f6aac41 | 462 | printk(KERN_ERR "%s: sparsemem memory map backing failed " |
d40cee24 | 463 | "some memory will not be available.\n", __func__); |
802f192e | 464 | ms->section_mem_map = 0; |
29751f69 AW |
465 | return NULL; |
466 | } | |
9bdac914 | 467 | #endif |
29751f69 | 468 | |
c2b91e2e YL |
469 | void __attribute__((weak)) __meminit vmemmap_populate_print_last(void) |
470 | { | |
471 | } | |
a4322e1b | 472 | |
193faea9 SR |
473 | /* |
474 | * Allocate the accumulated non-linear sections, allocate a mem_map | |
475 | * for each and record the physical to section mapping. | |
476 | */ | |
477 | void __init sparse_init(void) | |
478 | { | |
479 | unsigned long pnum; | |
480 | struct page *map; | |
9bdac914 | 481 | struct page **map_map; |
5c0e3066 | 482 | unsigned long *usemap; |
e123dd3f | 483 | unsigned long **usemap_map; |
9bdac914 | 484 | int size, size2; |
a4322e1b YL |
485 | int nodeid_begin = 0; |
486 | unsigned long pnum_begin = 0; | |
487 | unsigned long usemap_count; | |
9bdac914 | 488 | unsigned long map_count; |
e123dd3f YL |
489 | |
490 | /* | |
491 | * map is using big page (aka 2M in x86 64 bit) | |
492 | * usemap is less one page (aka 24 bytes) | |
493 | * so alloc 2M (with 2M align) and 24 bytes in turn will | |
494 | * make next 2M slip to one more 2M later. | |
495 | * then in big system, the memory will have a lot of holes... | |
496 | * here try to allocate 2M pages continously. | |
497 | * | |
498 | * powerpc need to call sparse_init_one_section right after each | |
499 | * sparse_early_mem_map_alloc, so allocate usemap_map at first. | |
500 | */ | |
501 | size = sizeof(unsigned long *) * NR_MEM_SECTIONS; | |
502 | usemap_map = alloc_bootmem(size); | |
503 | if (!usemap_map) | |
504 | panic("can not allocate usemap_map\n"); | |
193faea9 SR |
505 | |
506 | for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { | |
a4322e1b YL |
507 | struct mem_section *ms; |
508 | ||
540557b9 | 509 | if (!present_section_nr(pnum)) |
193faea9 | 510 | continue; |
a4322e1b YL |
511 | ms = __nr_to_section(pnum); |
512 | nodeid_begin = sparse_early_nid(ms); | |
513 | pnum_begin = pnum; | |
514 | break; | |
515 | } | |
516 | usemap_count = 1; | |
517 | for (pnum = pnum_begin + 1; pnum < NR_MEM_SECTIONS; pnum++) { | |
518 | struct mem_section *ms; | |
519 | int nodeid; | |
520 | ||
521 | if (!present_section_nr(pnum)) | |
522 | continue; | |
523 | ms = __nr_to_section(pnum); | |
524 | nodeid = sparse_early_nid(ms); | |
525 | if (nodeid == nodeid_begin) { | |
526 | usemap_count++; | |
527 | continue; | |
528 | } | |
529 | /* ok, we need to take cake of from pnum_begin to pnum - 1*/ | |
530 | sparse_early_usemaps_alloc_node(usemap_map, pnum_begin, pnum, | |
531 | usemap_count, nodeid_begin); | |
532 | /* new start, update count etc*/ | |
533 | nodeid_begin = nodeid; | |
534 | pnum_begin = pnum; | |
535 | usemap_count = 1; | |
e123dd3f | 536 | } |
a4322e1b YL |
537 | /* ok, last chunk */ |
538 | sparse_early_usemaps_alloc_node(usemap_map, pnum_begin, NR_MEM_SECTIONS, | |
539 | usemap_count, nodeid_begin); | |
193faea9 | 540 | |
9bdac914 YL |
541 | #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER |
542 | size2 = sizeof(struct page *) * NR_MEM_SECTIONS; | |
543 | map_map = alloc_bootmem(size2); | |
544 | if (!map_map) | |
545 | panic("can not allocate map_map\n"); | |
546 | ||
547 | for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { | |
548 | struct mem_section *ms; | |
549 | ||
550 | if (!present_section_nr(pnum)) | |
551 | continue; | |
552 | ms = __nr_to_section(pnum); | |
553 | nodeid_begin = sparse_early_nid(ms); | |
554 | pnum_begin = pnum; | |
555 | break; | |
556 | } | |
557 | map_count = 1; | |
558 | for (pnum = pnum_begin + 1; pnum < NR_MEM_SECTIONS; pnum++) { | |
559 | struct mem_section *ms; | |
560 | int nodeid; | |
561 | ||
562 | if (!present_section_nr(pnum)) | |
563 | continue; | |
564 | ms = __nr_to_section(pnum); | |
565 | nodeid = sparse_early_nid(ms); | |
566 | if (nodeid == nodeid_begin) { | |
567 | map_count++; | |
568 | continue; | |
569 | } | |
570 | /* ok, we need to take cake of from pnum_begin to pnum - 1*/ | |
571 | sparse_early_mem_maps_alloc_node(map_map, pnum_begin, pnum, | |
572 | map_count, nodeid_begin); | |
573 | /* new start, update count etc*/ | |
574 | nodeid_begin = nodeid; | |
575 | pnum_begin = pnum; | |
576 | map_count = 1; | |
577 | } | |
578 | /* ok, last chunk */ | |
579 | sparse_early_mem_maps_alloc_node(map_map, pnum_begin, NR_MEM_SECTIONS, | |
580 | map_count, nodeid_begin); | |
581 | #endif | |
582 | ||
e123dd3f YL |
583 | for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { |
584 | if (!present_section_nr(pnum)) | |
193faea9 | 585 | continue; |
5c0e3066 | 586 | |
e123dd3f | 587 | usemap = usemap_map[pnum]; |
5c0e3066 MG |
588 | if (!usemap) |
589 | continue; | |
590 | ||
9bdac914 YL |
591 | #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER |
592 | map = map_map[pnum]; | |
593 | #else | |
e123dd3f | 594 | map = sparse_early_mem_map_alloc(pnum); |
9bdac914 | 595 | #endif |
e123dd3f YL |
596 | if (!map) |
597 | continue; | |
598 | ||
5c0e3066 MG |
599 | sparse_init_one_section(__nr_to_section(pnum), pnum, map, |
600 | usemap); | |
193faea9 | 601 | } |
e123dd3f | 602 | |
c2b91e2e YL |
603 | vmemmap_populate_print_last(); |
604 | ||
9bdac914 YL |
605 | #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER |
606 | free_bootmem(__pa(map_map), size2); | |
607 | #endif | |
e123dd3f | 608 | free_bootmem(__pa(usemap_map), size); |
193faea9 SR |
609 | } |
610 | ||
611 | #ifdef CONFIG_MEMORY_HOTPLUG | |
98f3cfc1 YG |
612 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
613 | static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid, | |
614 | unsigned long nr_pages) | |
615 | { | |
616 | /* This will make the necessary allocations eventually. */ | |
617 | return sparse_mem_map_populate(pnum, nid); | |
618 | } | |
619 | static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages) | |
620 | { | |
621 | return; /* XXX: Not implemented yet */ | |
622 | } | |
0c0a4a51 YG |
623 | static void free_map_bootmem(struct page *page, unsigned long nr_pages) |
624 | { | |
625 | } | |
98f3cfc1 | 626 | #else |
0b0acbec DH |
627 | static struct page *__kmalloc_section_memmap(unsigned long nr_pages) |
628 | { | |
629 | struct page *page, *ret; | |
630 | unsigned long memmap_size = sizeof(struct page) * nr_pages; | |
631 | ||
f2d0aa5b | 632 | page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size)); |
0b0acbec DH |
633 | if (page) |
634 | goto got_map_page; | |
635 | ||
636 | ret = vmalloc(memmap_size); | |
637 | if (ret) | |
638 | goto got_map_ptr; | |
639 | ||
640 | return NULL; | |
641 | got_map_page: | |
642 | ret = (struct page *)pfn_to_kaddr(page_to_pfn(page)); | |
643 | got_map_ptr: | |
644 | memset(ret, 0, memmap_size); | |
645 | ||
646 | return ret; | |
647 | } | |
648 | ||
98f3cfc1 YG |
649 | static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid, |
650 | unsigned long nr_pages) | |
651 | { | |
652 | return __kmalloc_section_memmap(nr_pages); | |
653 | } | |
654 | ||
0b0acbec DH |
655 | static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages) |
656 | { | |
9e2779fa | 657 | if (is_vmalloc_addr(memmap)) |
0b0acbec DH |
658 | vfree(memmap); |
659 | else | |
660 | free_pages((unsigned long)memmap, | |
661 | get_order(sizeof(struct page) * nr_pages)); | |
662 | } | |
0c0a4a51 YG |
663 | |
664 | static void free_map_bootmem(struct page *page, unsigned long nr_pages) | |
665 | { | |
666 | unsigned long maps_section_nr, removing_section_nr, i; | |
667 | int magic; | |
668 | ||
669 | for (i = 0; i < nr_pages; i++, page++) { | |
670 | magic = atomic_read(&page->_mapcount); | |
671 | ||
672 | BUG_ON(magic == NODE_INFO); | |
673 | ||
674 | maps_section_nr = pfn_to_section_nr(page_to_pfn(page)); | |
675 | removing_section_nr = page->private; | |
676 | ||
677 | /* | |
678 | * When this function is called, the removing section is | |
679 | * logical offlined state. This means all pages are isolated | |
680 | * from page allocator. If removing section's memmap is placed | |
681 | * on the same section, it must not be freed. | |
682 | * If it is freed, page allocator may allocate it which will | |
683 | * be removed physically soon. | |
684 | */ | |
685 | if (maps_section_nr != removing_section_nr) | |
686 | put_page_bootmem(page); | |
687 | } | |
688 | } | |
98f3cfc1 | 689 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
0b0acbec | 690 | |
ea01ea93 BP |
691 | static void free_section_usemap(struct page *memmap, unsigned long *usemap) |
692 | { | |
0c0a4a51 YG |
693 | struct page *usemap_page; |
694 | unsigned long nr_pages; | |
695 | ||
ea01ea93 BP |
696 | if (!usemap) |
697 | return; | |
698 | ||
0c0a4a51 | 699 | usemap_page = virt_to_page(usemap); |
ea01ea93 BP |
700 | /* |
701 | * Check to see if allocation came from hot-plug-add | |
702 | */ | |
0c0a4a51 | 703 | if (PageSlab(usemap_page)) { |
ea01ea93 BP |
704 | kfree(usemap); |
705 | if (memmap) | |
706 | __kfree_section_memmap(memmap, PAGES_PER_SECTION); | |
707 | return; | |
708 | } | |
709 | ||
710 | /* | |
0c0a4a51 YG |
711 | * The usemap came from bootmem. This is packed with other usemaps |
712 | * on the section which has pgdat at boot time. Just keep it as is now. | |
ea01ea93 | 713 | */ |
0c0a4a51 YG |
714 | |
715 | if (memmap) { | |
716 | struct page *memmap_page; | |
717 | memmap_page = virt_to_page(memmap); | |
718 | ||
719 | nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page)) | |
720 | >> PAGE_SHIFT; | |
721 | ||
722 | free_map_bootmem(memmap_page, nr_pages); | |
723 | } | |
ea01ea93 BP |
724 | } |
725 | ||
29751f69 AW |
726 | /* |
727 | * returns the number of sections whose mem_maps were properly | |
728 | * set. If this is <=0, then that means that the passed-in | |
729 | * map was not consumed and must be freed. | |
730 | */ | |
31168481 | 731 | int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn, |
0b0acbec | 732 | int nr_pages) |
29751f69 | 733 | { |
0b0acbec DH |
734 | unsigned long section_nr = pfn_to_section_nr(start_pfn); |
735 | struct pglist_data *pgdat = zone->zone_pgdat; | |
736 | struct mem_section *ms; | |
737 | struct page *memmap; | |
5c0e3066 | 738 | unsigned long *usemap; |
0b0acbec DH |
739 | unsigned long flags; |
740 | int ret; | |
29751f69 | 741 | |
0b0acbec DH |
742 | /* |
743 | * no locking for this, because it does its own | |
744 | * plus, it does a kmalloc | |
745 | */ | |
bbd06825 WC |
746 | ret = sparse_index_init(section_nr, pgdat->node_id); |
747 | if (ret < 0 && ret != -EEXIST) | |
748 | return ret; | |
98f3cfc1 | 749 | memmap = kmalloc_section_memmap(section_nr, pgdat->node_id, nr_pages); |
bbd06825 WC |
750 | if (!memmap) |
751 | return -ENOMEM; | |
5c0e3066 | 752 | usemap = __kmalloc_section_usemap(); |
bbd06825 WC |
753 | if (!usemap) { |
754 | __kfree_section_memmap(memmap, nr_pages); | |
755 | return -ENOMEM; | |
756 | } | |
0b0acbec DH |
757 | |
758 | pgdat_resize_lock(pgdat, &flags); | |
29751f69 | 759 | |
0b0acbec DH |
760 | ms = __pfn_to_section(start_pfn); |
761 | if (ms->section_mem_map & SECTION_MARKED_PRESENT) { | |
762 | ret = -EEXIST; | |
763 | goto out; | |
764 | } | |
5c0e3066 | 765 | |
29751f69 AW |
766 | ms->section_mem_map |= SECTION_MARKED_PRESENT; |
767 | ||
5c0e3066 | 768 | ret = sparse_init_one_section(ms, section_nr, memmap, usemap); |
0b0acbec | 769 | |
0b0acbec DH |
770 | out: |
771 | pgdat_resize_unlock(pgdat, &flags); | |
bbd06825 WC |
772 | if (ret <= 0) { |
773 | kfree(usemap); | |
46a66eec | 774 | __kfree_section_memmap(memmap, nr_pages); |
bbd06825 | 775 | } |
0b0acbec | 776 | return ret; |
29751f69 | 777 | } |
ea01ea93 BP |
778 | |
779 | void sparse_remove_one_section(struct zone *zone, struct mem_section *ms) | |
780 | { | |
781 | struct page *memmap = NULL; | |
782 | unsigned long *usemap = NULL; | |
783 | ||
784 | if (ms->section_mem_map) { | |
785 | usemap = ms->pageblock_flags; | |
786 | memmap = sparse_decode_mem_map(ms->section_mem_map, | |
787 | __section_nr(ms)); | |
788 | ms->section_mem_map = 0; | |
789 | ms->pageblock_flags = NULL; | |
790 | } | |
791 | ||
792 | free_section_usemap(memmap, usemap); | |
793 | } | |
a3142c8e | 794 | #endif |