Commit | Line | Data |
---|---|---|
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> | |
0b0acbec | 8 | #include <linux/highmem.h> |
b95f1b31 | 9 | #include <linux/export.h> |
28ae55c9 | 10 | #include <linux/spinlock.h> |
0b0acbec | 11 | #include <linux/vmalloc.h> |
0c0a4a51 | 12 | #include "internal.h" |
d41dee36 | 13 | #include <asm/dma.h> |
8f6aac41 CL |
14 | #include <asm/pgalloc.h> |
15 | #include <asm/pgtable.h> | |
d41dee36 AW |
16 | |
17 | /* | |
18 | * Permanent SPARSEMEM data: | |
19 | * | |
20 | * 1) mem_section - memory sections, mem_map's for valid memory | |
21 | */ | |
3e347261 | 22 | #ifdef CONFIG_SPARSEMEM_EXTREME |
802f192e | 23 | struct mem_section *mem_section[NR_SECTION_ROOTS] |
22fc6ecc | 24 | ____cacheline_internodealigned_in_smp; |
3e347261 BP |
25 | #else |
26 | struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT] | |
22fc6ecc | 27 | ____cacheline_internodealigned_in_smp; |
3e347261 BP |
28 | #endif |
29 | EXPORT_SYMBOL(mem_section); | |
30 | ||
89689ae7 CL |
31 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
32 | /* | |
33 | * If we did not store the node number in the page then we have to | |
34 | * do a lookup in the section_to_node_table in order to find which | |
35 | * node the page belongs to. | |
36 | */ | |
37 | #if MAX_NUMNODES <= 256 | |
38 | static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; | |
39 | #else | |
40 | static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; | |
41 | #endif | |
42 | ||
33dd4e0e | 43 | int page_to_nid(const struct page *page) |
89689ae7 CL |
44 | { |
45 | return section_to_node_table[page_to_section(page)]; | |
46 | } | |
47 | EXPORT_SYMBOL(page_to_nid); | |
85770ffe AW |
48 | |
49 | static void set_section_nid(unsigned long section_nr, int nid) | |
50 | { | |
51 | section_to_node_table[section_nr] = nid; | |
52 | } | |
53 | #else /* !NODE_NOT_IN_PAGE_FLAGS */ | |
54 | static inline void set_section_nid(unsigned long section_nr, int nid) | |
55 | { | |
56 | } | |
89689ae7 CL |
57 | #endif |
58 | ||
3e347261 | 59 | #ifdef CONFIG_SPARSEMEM_EXTREME |
577a32f6 | 60 | static struct mem_section noinline __init_refok *sparse_index_alloc(int nid) |
28ae55c9 DH |
61 | { |
62 | struct mem_section *section = NULL; | |
63 | unsigned long array_size = SECTIONS_PER_ROOT * | |
64 | sizeof(struct mem_section); | |
65 | ||
f52407ce SL |
66 | if (slab_is_available()) { |
67 | if (node_state(nid, N_HIGH_MEMORY)) | |
5b760e64 | 68 | section = kzalloc_node(array_size, GFP_KERNEL, nid); |
f52407ce | 69 | else |
5b760e64 GS |
70 | section = kzalloc(array_size, GFP_KERNEL); |
71 | } else { | |
46a66eec | 72 | section = alloc_bootmem_node(NODE_DATA(nid), array_size); |
5b760e64 | 73 | } |
28ae55c9 DH |
74 | |
75 | return section; | |
3e347261 | 76 | } |
802f192e | 77 | |
a3142c8e | 78 | static int __meminit sparse_index_init(unsigned long section_nr, int nid) |
802f192e | 79 | { |
28ae55c9 DH |
80 | unsigned long root = SECTION_NR_TO_ROOT(section_nr); |
81 | struct mem_section *section; | |
802f192e BP |
82 | |
83 | if (mem_section[root]) | |
28ae55c9 | 84 | return -EEXIST; |
3e347261 | 85 | |
28ae55c9 | 86 | section = sparse_index_alloc(nid); |
af0cd5a7 WC |
87 | if (!section) |
88 | return -ENOMEM; | |
28ae55c9 DH |
89 | |
90 | mem_section[root] = section; | |
c1c95183 | 91 | |
9d1936cf | 92 | return 0; |
28ae55c9 DH |
93 | } |
94 | #else /* !SPARSEMEM_EXTREME */ | |
95 | static inline int sparse_index_init(unsigned long section_nr, int nid) | |
96 | { | |
97 | return 0; | |
802f192e | 98 | } |
28ae55c9 DH |
99 | #endif |
100 | ||
4ca644d9 DH |
101 | /* |
102 | * Although written for the SPARSEMEM_EXTREME case, this happens | |
cd881a6b | 103 | * to also work for the flat array case because |
4ca644d9 DH |
104 | * NR_SECTION_ROOTS==NR_MEM_SECTIONS. |
105 | */ | |
106 | int __section_nr(struct mem_section* ms) | |
107 | { | |
108 | unsigned long root_nr; | |
109 | struct mem_section* root; | |
110 | ||
12783b00 MK |
111 | for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) { |
112 | root = __nr_to_section(root_nr * SECTIONS_PER_ROOT); | |
4ca644d9 DH |
113 | if (!root) |
114 | continue; | |
115 | ||
116 | if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT))) | |
117 | break; | |
118 | } | |
119 | ||
db36a461 GS |
120 | VM_BUG_ON(root_nr == NR_SECTION_ROOTS); |
121 | ||
4ca644d9 DH |
122 | return (root_nr * SECTIONS_PER_ROOT) + (ms - root); |
123 | } | |
124 | ||
30c253e6 AW |
125 | /* |
126 | * During early boot, before section_mem_map is used for an actual | |
127 | * mem_map, we use section_mem_map to store the section's NUMA | |
128 | * node. This keeps us from having to use another data structure. The | |
129 | * node information is cleared just before we store the real mem_map. | |
130 | */ | |
131 | static inline unsigned long sparse_encode_early_nid(int nid) | |
132 | { | |
133 | return (nid << SECTION_NID_SHIFT); | |
134 | } | |
135 | ||
136 | static inline int sparse_early_nid(struct mem_section *section) | |
137 | { | |
138 | return (section->section_mem_map >> SECTION_NID_SHIFT); | |
139 | } | |
140 | ||
2dbb51c4 MG |
141 | /* Validate the physical addressing limitations of the model */ |
142 | void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
143 | unsigned long *end_pfn) | |
d41dee36 | 144 | { |
2dbb51c4 | 145 | unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT); |
d41dee36 | 146 | |
bead9a3a IM |
147 | /* |
148 | * Sanity checks - do not allow an architecture to pass | |
149 | * in larger pfns than the maximum scope of sparsemem: | |
150 | */ | |
2dbb51c4 MG |
151 | if (*start_pfn > max_sparsemem_pfn) { |
152 | mminit_dprintk(MMINIT_WARNING, "pfnvalidation", | |
153 | "Start of range %lu -> %lu exceeds SPARSEMEM max %lu\n", | |
154 | *start_pfn, *end_pfn, max_sparsemem_pfn); | |
155 | WARN_ON_ONCE(1); | |
156 | *start_pfn = max_sparsemem_pfn; | |
157 | *end_pfn = max_sparsemem_pfn; | |
ef161a98 | 158 | } else if (*end_pfn > max_sparsemem_pfn) { |
2dbb51c4 MG |
159 | mminit_dprintk(MMINIT_WARNING, "pfnvalidation", |
160 | "End of range %lu -> %lu exceeds SPARSEMEM max %lu\n", | |
161 | *start_pfn, *end_pfn, max_sparsemem_pfn); | |
162 | WARN_ON_ONCE(1); | |
163 | *end_pfn = max_sparsemem_pfn; | |
164 | } | |
165 | } | |
166 | ||
167 | /* Record a memory area against a node. */ | |
168 | void __init memory_present(int nid, unsigned long start, unsigned long end) | |
169 | { | |
170 | unsigned long pfn; | |
bead9a3a | 171 | |
d41dee36 | 172 | start &= PAGE_SECTION_MASK; |
2dbb51c4 | 173 | mminit_validate_memmodel_limits(&start, &end); |
d41dee36 AW |
174 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) { |
175 | unsigned long section = pfn_to_section_nr(pfn); | |
802f192e BP |
176 | struct mem_section *ms; |
177 | ||
178 | sparse_index_init(section, nid); | |
85770ffe | 179 | set_section_nid(section, nid); |
802f192e BP |
180 | |
181 | ms = __nr_to_section(section); | |
182 | if (!ms->section_mem_map) | |
30c253e6 AW |
183 | ms->section_mem_map = sparse_encode_early_nid(nid) | |
184 | SECTION_MARKED_PRESENT; | |
d41dee36 AW |
185 | } |
186 | } | |
187 | ||
188 | /* | |
189 | * Only used by the i386 NUMA architecures, but relatively | |
190 | * generic code. | |
191 | */ | |
192 | unsigned long __init node_memmap_size_bytes(int nid, unsigned long start_pfn, | |
193 | unsigned long end_pfn) | |
194 | { | |
195 | unsigned long pfn; | |
196 | unsigned long nr_pages = 0; | |
197 | ||
2dbb51c4 | 198 | mminit_validate_memmodel_limits(&start_pfn, &end_pfn); |
d41dee36 AW |
199 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
200 | if (nid != early_pfn_to_nid(pfn)) | |
201 | continue; | |
202 | ||
540557b9 | 203 | if (pfn_present(pfn)) |
d41dee36 AW |
204 | nr_pages += PAGES_PER_SECTION; |
205 | } | |
206 | ||
207 | return nr_pages * sizeof(struct page); | |
208 | } | |
209 | ||
29751f69 AW |
210 | /* |
211 | * Subtle, we encode the real pfn into the mem_map such that | |
212 | * the identity pfn - section_mem_map will return the actual | |
213 | * physical page frame number. | |
214 | */ | |
215 | static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum) | |
216 | { | |
217 | return (unsigned long)(mem_map - (section_nr_to_pfn(pnum))); | |
218 | } | |
219 | ||
220 | /* | |
ea01ea93 | 221 | * Decode mem_map from the coded memmap |
29751f69 | 222 | */ |
29751f69 AW |
223 | struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum) |
224 | { | |
ea01ea93 BP |
225 | /* mask off the extra low bits of information */ |
226 | coded_mem_map &= SECTION_MAP_MASK; | |
29751f69 AW |
227 | return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum); |
228 | } | |
229 | ||
a3142c8e | 230 | static int __meminit sparse_init_one_section(struct mem_section *ms, |
5c0e3066 MG |
231 | unsigned long pnum, struct page *mem_map, |
232 | unsigned long *pageblock_bitmap) | |
29751f69 | 233 | { |
540557b9 | 234 | if (!present_section(ms)) |
29751f69 AW |
235 | return -EINVAL; |
236 | ||
30c253e6 | 237 | ms->section_mem_map &= ~SECTION_MAP_MASK; |
540557b9 AW |
238 | ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) | |
239 | SECTION_HAS_MEM_MAP; | |
5c0e3066 | 240 | ms->pageblock_flags = pageblock_bitmap; |
29751f69 AW |
241 | |
242 | return 1; | |
243 | } | |
244 | ||
04753278 | 245 | unsigned long usemap_size(void) |
5c0e3066 MG |
246 | { |
247 | unsigned long size_bytes; | |
248 | size_bytes = roundup(SECTION_BLOCKFLAGS_BITS, 8) / 8; | |
249 | size_bytes = roundup(size_bytes, sizeof(unsigned long)); | |
250 | return size_bytes; | |
251 | } | |
252 | ||
253 | #ifdef CONFIG_MEMORY_HOTPLUG | |
254 | static unsigned long *__kmalloc_section_usemap(void) | |
255 | { | |
256 | return kmalloc(usemap_size(), GFP_KERNEL); | |
257 | } | |
258 | #endif /* CONFIG_MEMORY_HOTPLUG */ | |
259 | ||
48c90682 YG |
260 | #ifdef CONFIG_MEMORY_HOTREMOVE |
261 | static unsigned long * __init | |
a4322e1b | 262 | sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat, |
238305bb | 263 | unsigned long size) |
48c90682 | 264 | { |
99ab7b19 YL |
265 | unsigned long goal, limit; |
266 | unsigned long *p; | |
267 | int nid; | |
48c90682 YG |
268 | /* |
269 | * A page may contain usemaps for other sections preventing the | |
270 | * page being freed and making a section unremovable while | |
271 | * other sections referencing the usemap retmain active. Similarly, | |
272 | * a pgdat can prevent a section being removed. If section A | |
273 | * contains a pgdat and section B contains the usemap, both | |
274 | * sections become inter-dependent. This allocates usemaps | |
275 | * from the same section as the pgdat where possible to avoid | |
276 | * this problem. | |
277 | */ | |
07b4e2bc | 278 | goal = __pa(pgdat) & (PAGE_SECTION_MASK << PAGE_SHIFT); |
99ab7b19 YL |
279 | limit = goal + (1UL << PA_SECTION_SHIFT); |
280 | nid = early_pfn_to_nid(goal >> PAGE_SHIFT); | |
281 | again: | |
282 | p = ___alloc_bootmem_node_nopanic(NODE_DATA(nid), size, | |
283 | SMP_CACHE_BYTES, goal, limit); | |
284 | if (!p && limit) { | |
285 | limit = 0; | |
286 | goto again; | |
287 | } | |
288 | return p; | |
48c90682 YG |
289 | } |
290 | ||
291 | static void __init check_usemap_section_nr(int nid, unsigned long *usemap) | |
292 | { | |
293 | unsigned long usemap_snr, pgdat_snr; | |
294 | static unsigned long old_usemap_snr = NR_MEM_SECTIONS; | |
295 | static unsigned long old_pgdat_snr = NR_MEM_SECTIONS; | |
296 | struct pglist_data *pgdat = NODE_DATA(nid); | |
297 | int usemap_nid; | |
298 | ||
299 | usemap_snr = pfn_to_section_nr(__pa(usemap) >> PAGE_SHIFT); | |
300 | pgdat_snr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT); | |
301 | if (usemap_snr == pgdat_snr) | |
302 | return; | |
303 | ||
304 | if (old_usemap_snr == usemap_snr && old_pgdat_snr == pgdat_snr) | |
305 | /* skip redundant message */ | |
306 | return; | |
307 | ||
308 | old_usemap_snr = usemap_snr; | |
309 | old_pgdat_snr = pgdat_snr; | |
310 | ||
311 | usemap_nid = sparse_early_nid(__nr_to_section(usemap_snr)); | |
312 | if (usemap_nid != nid) { | |
313 | printk(KERN_INFO | |
314 | "node %d must be removed before remove section %ld\n", | |
315 | nid, usemap_snr); | |
316 | return; | |
317 | } | |
318 | /* | |
319 | * There is a circular dependency. | |
320 | * Some platforms allow un-removable section because they will just | |
321 | * gather other removable sections for dynamic partitioning. | |
322 | * Just notify un-removable section's number here. | |
323 | */ | |
324 | printk(KERN_INFO "Section %ld and %ld (node %d)", usemap_snr, | |
325 | pgdat_snr, nid); | |
326 | printk(KERN_CONT | |
327 | " have a circular dependency on usemap and pgdat allocations\n"); | |
328 | } | |
329 | #else | |
330 | static unsigned long * __init | |
a4322e1b | 331 | sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat, |
238305bb | 332 | unsigned long size) |
48c90682 | 333 | { |
238305bb | 334 | return alloc_bootmem_node_nopanic(pgdat, size); |
48c90682 YG |
335 | } |
336 | ||
337 | static void __init check_usemap_section_nr(int nid, unsigned long *usemap) | |
338 | { | |
339 | } | |
340 | #endif /* CONFIG_MEMORY_HOTREMOVE */ | |
341 | ||
18732093 | 342 | static void __init sparse_early_usemaps_alloc_node(void *data, |
a4322e1b YL |
343 | unsigned long pnum_begin, |
344 | unsigned long pnum_end, | |
345 | unsigned long usemap_count, int nodeid) | |
5c0e3066 | 346 | { |
a4322e1b YL |
347 | void *usemap; |
348 | unsigned long pnum; | |
18732093 | 349 | unsigned long **usemap_map = (unsigned long **)data; |
a4322e1b | 350 | int size = usemap_size(); |
5c0e3066 | 351 | |
a4322e1b | 352 | usemap = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nodeid), |
238305bb | 353 | size * usemap_count); |
f5bf18fa | 354 | if (!usemap) { |
238305bb JW |
355 | printk(KERN_WARNING "%s: allocation failed\n", __func__); |
356 | return; | |
48c90682 YG |
357 | } |
358 | ||
f5bf18fa NA |
359 | for (pnum = pnum_begin; pnum < pnum_end; pnum++) { |
360 | if (!present_section_nr(pnum)) | |
361 | continue; | |
362 | usemap_map[pnum] = usemap; | |
363 | usemap += size; | |
364 | check_usemap_section_nr(nodeid, usemap_map[pnum]); | |
a4322e1b | 365 | } |
5c0e3066 MG |
366 | } |
367 | ||
8f6aac41 | 368 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
98f3cfc1 | 369 | struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid) |
29751f69 AW |
370 | { |
371 | struct page *map; | |
e48e67e0 | 372 | unsigned long size; |
29751f69 AW |
373 | |
374 | map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION); | |
375 | if (map) | |
376 | return map; | |
377 | ||
e48e67e0 YL |
378 | size = PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION); |
379 | map = __alloc_bootmem_node_high(NODE_DATA(nid), size, | |
380 | PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); | |
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); | |
e48e67e0 YL |
404 | map = __alloc_bootmem_node_high(NODE_DATA(nodeid), size * map_count, |
405 | PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); | |
9bdac914 YL |
406 | if (map) { |
407 | for (pnum = pnum_begin; pnum < pnum_end; pnum++) { | |
408 | if (!present_section_nr(pnum)) | |
409 | continue; | |
410 | map_map[pnum] = map; | |
411 | map += size; | |
412 | } | |
413 | return; | |
414 | } | |
415 | ||
416 | /* fallback */ | |
417 | for (pnum = pnum_begin; pnum < pnum_end; pnum++) { | |
418 | struct mem_section *ms; | |
419 | ||
420 | if (!present_section_nr(pnum)) | |
421 | continue; | |
422 | map_map[pnum] = sparse_mem_map_populate(pnum, nodeid); | |
423 | if (map_map[pnum]) | |
424 | continue; | |
425 | ms = __nr_to_section(pnum); | |
426 | printk(KERN_ERR "%s: sparsemem memory map backing failed " | |
427 | "some memory will not be available.\n", __func__); | |
428 | ms->section_mem_map = 0; | |
429 | } | |
430 | } | |
8f6aac41 CL |
431 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ |
432 | ||
81d0d950 | 433 | #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER |
18732093 | 434 | static void __init sparse_early_mem_maps_alloc_node(void *data, |
9bdac914 YL |
435 | unsigned long pnum_begin, |
436 | unsigned long pnum_end, | |
437 | unsigned long map_count, int nodeid) | |
438 | { | |
18732093 | 439 | struct page **map_map = (struct page **)data; |
9bdac914 YL |
440 | sparse_mem_maps_populate_node(map_map, pnum_begin, pnum_end, |
441 | map_count, nodeid); | |
442 | } | |
81d0d950 | 443 | #else |
9e5c6da7 | 444 | static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum) |
8f6aac41 CL |
445 | { |
446 | struct page *map; | |
447 | struct mem_section *ms = __nr_to_section(pnum); | |
448 | int nid = sparse_early_nid(ms); | |
449 | ||
98f3cfc1 | 450 | map = sparse_mem_map_populate(pnum, nid); |
29751f69 AW |
451 | if (map) |
452 | return map; | |
453 | ||
8f6aac41 | 454 | printk(KERN_ERR "%s: sparsemem memory map backing failed " |
d40cee24 | 455 | "some memory will not be available.\n", __func__); |
802f192e | 456 | ms->section_mem_map = 0; |
29751f69 AW |
457 | return NULL; |
458 | } | |
9bdac914 | 459 | #endif |
29751f69 | 460 | |
c2b91e2e YL |
461 | void __attribute__((weak)) __meminit vmemmap_populate_print_last(void) |
462 | { | |
463 | } | |
a4322e1b | 464 | |
18732093 WL |
465 | /** |
466 | * alloc_usemap_and_memmap - memory alloction for pageblock flags and vmemmap | |
467 | * @map: usemap_map for pageblock flags or mmap_map for vmemmap | |
468 | */ | |
469 | static void __init alloc_usemap_and_memmap(void (*alloc_func) | |
470 | (void *, unsigned long, unsigned long, | |
471 | unsigned long, int), void *data) | |
472 | { | |
473 | unsigned long pnum; | |
474 | unsigned long map_count; | |
475 | int nodeid_begin = 0; | |
476 | unsigned long pnum_begin = 0; | |
477 | ||
478 | for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { | |
479 | struct mem_section *ms; | |
480 | ||
481 | if (!present_section_nr(pnum)) | |
482 | continue; | |
483 | ms = __nr_to_section(pnum); | |
484 | nodeid_begin = sparse_early_nid(ms); | |
485 | pnum_begin = pnum; | |
486 | break; | |
487 | } | |
488 | map_count = 1; | |
489 | for (pnum = pnum_begin + 1; pnum < NR_MEM_SECTIONS; pnum++) { | |
490 | struct mem_section *ms; | |
491 | int nodeid; | |
492 | ||
493 | if (!present_section_nr(pnum)) | |
494 | continue; | |
495 | ms = __nr_to_section(pnum); | |
496 | nodeid = sparse_early_nid(ms); | |
497 | if (nodeid == nodeid_begin) { | |
498 | map_count++; | |
499 | continue; | |
500 | } | |
501 | /* ok, we need to take cake of from pnum_begin to pnum - 1*/ | |
502 | alloc_func(data, pnum_begin, pnum, | |
503 | map_count, nodeid_begin); | |
504 | /* new start, update count etc*/ | |
505 | nodeid_begin = nodeid; | |
506 | pnum_begin = pnum; | |
507 | map_count = 1; | |
508 | } | |
509 | /* ok, last chunk */ | |
510 | alloc_func(data, pnum_begin, NR_MEM_SECTIONS, | |
511 | map_count, nodeid_begin); | |
512 | } | |
513 | ||
193faea9 SR |
514 | /* |
515 | * Allocate the accumulated non-linear sections, allocate a mem_map | |
516 | * for each and record the physical to section mapping. | |
517 | */ | |
518 | void __init sparse_init(void) | |
519 | { | |
520 | unsigned long pnum; | |
521 | struct page *map; | |
5c0e3066 | 522 | unsigned long *usemap; |
e123dd3f | 523 | unsigned long **usemap_map; |
81d0d950 | 524 | int size; |
81d0d950 | 525 | #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER |
81d0d950 YL |
526 | int size2; |
527 | struct page **map_map; | |
528 | #endif | |
e123dd3f | 529 | |
55878e88 CS |
530 | /* see include/linux/mmzone.h 'struct mem_section' definition */ |
531 | BUILD_BUG_ON(!is_power_of_2(sizeof(struct mem_section))); | |
532 | ||
ca57df79 XQ |
533 | /* Setup pageblock_order for HUGETLB_PAGE_SIZE_VARIABLE */ |
534 | set_pageblock_order(); | |
535 | ||
e123dd3f YL |
536 | /* |
537 | * map is using big page (aka 2M in x86 64 bit) | |
538 | * usemap is less one page (aka 24 bytes) | |
539 | * so alloc 2M (with 2M align) and 24 bytes in turn will | |
540 | * make next 2M slip to one more 2M later. | |
541 | * then in big system, the memory will have a lot of holes... | |
25985edc | 542 | * here try to allocate 2M pages continuously. |
e123dd3f YL |
543 | * |
544 | * powerpc need to call sparse_init_one_section right after each | |
545 | * sparse_early_mem_map_alloc, so allocate usemap_map at first. | |
546 | */ | |
547 | size = sizeof(unsigned long *) * NR_MEM_SECTIONS; | |
548 | usemap_map = alloc_bootmem(size); | |
549 | if (!usemap_map) | |
550 | panic("can not allocate usemap_map\n"); | |
18732093 WL |
551 | alloc_usemap_and_memmap(sparse_early_usemaps_alloc_node, |
552 | (void *)usemap_map); | |
193faea9 | 553 | |
9bdac914 YL |
554 | #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER |
555 | size2 = sizeof(struct page *) * NR_MEM_SECTIONS; | |
556 | map_map = alloc_bootmem(size2); | |
557 | if (!map_map) | |
558 | panic("can not allocate map_map\n"); | |
18732093 WL |
559 | alloc_usemap_and_memmap(sparse_early_mem_maps_alloc_node, |
560 | (void *)map_map); | |
9bdac914 YL |
561 | #endif |
562 | ||
e123dd3f YL |
563 | for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { |
564 | if (!present_section_nr(pnum)) | |
193faea9 | 565 | continue; |
5c0e3066 | 566 | |
e123dd3f | 567 | usemap = usemap_map[pnum]; |
5c0e3066 MG |
568 | if (!usemap) |
569 | continue; | |
570 | ||
9bdac914 YL |
571 | #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER |
572 | map = map_map[pnum]; | |
573 | #else | |
e123dd3f | 574 | map = sparse_early_mem_map_alloc(pnum); |
9bdac914 | 575 | #endif |
e123dd3f YL |
576 | if (!map) |
577 | continue; | |
578 | ||
5c0e3066 MG |
579 | sparse_init_one_section(__nr_to_section(pnum), pnum, map, |
580 | usemap); | |
193faea9 | 581 | } |
e123dd3f | 582 | |
c2b91e2e YL |
583 | vmemmap_populate_print_last(); |
584 | ||
9bdac914 YL |
585 | #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER |
586 | free_bootmem(__pa(map_map), size2); | |
587 | #endif | |
e123dd3f | 588 | free_bootmem(__pa(usemap_map), size); |
193faea9 SR |
589 | } |
590 | ||
591 | #ifdef CONFIG_MEMORY_HOTPLUG | |
98f3cfc1 | 592 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
85b35fea | 593 | static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid) |
98f3cfc1 YG |
594 | { |
595 | /* This will make the necessary allocations eventually. */ | |
596 | return sparse_mem_map_populate(pnum, nid); | |
597 | } | |
85b35fea | 598 | static void __kfree_section_memmap(struct page *memmap) |
98f3cfc1 | 599 | { |
0aad818b | 600 | unsigned long start = (unsigned long)memmap; |
85b35fea | 601 | unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION); |
0aad818b JW |
602 | |
603 | vmemmap_free(start, end); | |
98f3cfc1 | 604 | } |
4edd7cef | 605 | #ifdef CONFIG_MEMORY_HOTREMOVE |
81556b02 | 606 | static void free_map_bootmem(struct page *memmap) |
0c0a4a51 | 607 | { |
0aad818b | 608 | unsigned long start = (unsigned long)memmap; |
81556b02 | 609 | unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION); |
0aad818b JW |
610 | |
611 | vmemmap_free(start, end); | |
0c0a4a51 | 612 | } |
4edd7cef | 613 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
98f3cfc1 | 614 | #else |
85b35fea | 615 | static struct page *__kmalloc_section_memmap(void) |
0b0acbec DH |
616 | { |
617 | struct page *page, *ret; | |
85b35fea | 618 | unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION; |
0b0acbec | 619 | |
f2d0aa5b | 620 | page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size)); |
0b0acbec DH |
621 | if (page) |
622 | goto got_map_page; | |
623 | ||
624 | ret = vmalloc(memmap_size); | |
625 | if (ret) | |
626 | goto got_map_ptr; | |
627 | ||
628 | return NULL; | |
629 | got_map_page: | |
630 | ret = (struct page *)pfn_to_kaddr(page_to_pfn(page)); | |
631 | got_map_ptr: | |
0b0acbec DH |
632 | |
633 | return ret; | |
634 | } | |
635 | ||
85b35fea | 636 | static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid) |
98f3cfc1 | 637 | { |
85b35fea | 638 | return __kmalloc_section_memmap(); |
98f3cfc1 YG |
639 | } |
640 | ||
85b35fea | 641 | static void __kfree_section_memmap(struct page *memmap) |
0b0acbec | 642 | { |
9e2779fa | 643 | if (is_vmalloc_addr(memmap)) |
0b0acbec DH |
644 | vfree(memmap); |
645 | else | |
646 | free_pages((unsigned long)memmap, | |
85b35fea | 647 | get_order(sizeof(struct page) * PAGES_PER_SECTION)); |
0b0acbec | 648 | } |
0c0a4a51 | 649 | |
4edd7cef | 650 | #ifdef CONFIG_MEMORY_HOTREMOVE |
81556b02 | 651 | static void free_map_bootmem(struct page *memmap) |
0c0a4a51 YG |
652 | { |
653 | unsigned long maps_section_nr, removing_section_nr, i; | |
81556b02 | 654 | unsigned long magic, nr_pages; |
ae64ffca | 655 | struct page *page = virt_to_page(memmap); |
0c0a4a51 | 656 | |
81556b02 ZY |
657 | nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page)) |
658 | >> PAGE_SHIFT; | |
659 | ||
0c0a4a51 | 660 | for (i = 0; i < nr_pages; i++, page++) { |
5f24ce5f | 661 | magic = (unsigned long) page->lru.next; |
0c0a4a51 YG |
662 | |
663 | BUG_ON(magic == NODE_INFO); | |
664 | ||
665 | maps_section_nr = pfn_to_section_nr(page_to_pfn(page)); | |
666 | removing_section_nr = page->private; | |
667 | ||
668 | /* | |
669 | * When this function is called, the removing section is | |
670 | * logical offlined state. This means all pages are isolated | |
671 | * from page allocator. If removing section's memmap is placed | |
672 | * on the same section, it must not be freed. | |
673 | * If it is freed, page allocator may allocate it which will | |
674 | * be removed physically soon. | |
675 | */ | |
676 | if (maps_section_nr != removing_section_nr) | |
677 | put_page_bootmem(page); | |
678 | } | |
679 | } | |
4edd7cef | 680 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
98f3cfc1 | 681 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
0b0acbec | 682 | |
29751f69 AW |
683 | /* |
684 | * returns the number of sections whose mem_maps were properly | |
685 | * set. If this is <=0, then that means that the passed-in | |
686 | * map was not consumed and must be freed. | |
687 | */ | |
85b35fea | 688 | int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn) |
29751f69 | 689 | { |
0b0acbec DH |
690 | unsigned long section_nr = pfn_to_section_nr(start_pfn); |
691 | struct pglist_data *pgdat = zone->zone_pgdat; | |
692 | struct mem_section *ms; | |
693 | struct page *memmap; | |
5c0e3066 | 694 | unsigned long *usemap; |
0b0acbec DH |
695 | unsigned long flags; |
696 | int ret; | |
29751f69 | 697 | |
0b0acbec DH |
698 | /* |
699 | * no locking for this, because it does its own | |
700 | * plus, it does a kmalloc | |
701 | */ | |
bbd06825 WC |
702 | ret = sparse_index_init(section_nr, pgdat->node_id); |
703 | if (ret < 0 && ret != -EEXIST) | |
704 | return ret; | |
85b35fea | 705 | memmap = kmalloc_section_memmap(section_nr, pgdat->node_id); |
bbd06825 WC |
706 | if (!memmap) |
707 | return -ENOMEM; | |
5c0e3066 | 708 | usemap = __kmalloc_section_usemap(); |
bbd06825 | 709 | if (!usemap) { |
85b35fea | 710 | __kfree_section_memmap(memmap); |
bbd06825 WC |
711 | return -ENOMEM; |
712 | } | |
0b0acbec DH |
713 | |
714 | pgdat_resize_lock(pgdat, &flags); | |
29751f69 | 715 | |
0b0acbec DH |
716 | ms = __pfn_to_section(start_pfn); |
717 | if (ms->section_mem_map & SECTION_MARKED_PRESENT) { | |
718 | ret = -EEXIST; | |
719 | goto out; | |
720 | } | |
5c0e3066 | 721 | |
85b35fea | 722 | memset(memmap, 0, sizeof(struct page) * PAGES_PER_SECTION); |
3ac19f8e | 723 | |
29751f69 AW |
724 | ms->section_mem_map |= SECTION_MARKED_PRESENT; |
725 | ||
5c0e3066 | 726 | ret = sparse_init_one_section(ms, section_nr, memmap, usemap); |
0b0acbec | 727 | |
0b0acbec DH |
728 | out: |
729 | pgdat_resize_unlock(pgdat, &flags); | |
bbd06825 WC |
730 | if (ret <= 0) { |
731 | kfree(usemap); | |
85b35fea | 732 | __kfree_section_memmap(memmap); |
bbd06825 | 733 | } |
0b0acbec | 734 | return ret; |
29751f69 | 735 | } |
ea01ea93 | 736 | |
f3deb687 | 737 | #ifdef CONFIG_MEMORY_HOTREMOVE |
95a4774d WC |
738 | #ifdef CONFIG_MEMORY_FAILURE |
739 | static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages) | |
740 | { | |
741 | int i; | |
742 | ||
743 | if (!memmap) | |
744 | return; | |
745 | ||
746 | for (i = 0; i < PAGES_PER_SECTION; i++) { | |
747 | if (PageHWPoison(&memmap[i])) { | |
293c07e3 | 748 | atomic_long_sub(1, &num_poisoned_pages); |
95a4774d WC |
749 | ClearPageHWPoison(&memmap[i]); |
750 | } | |
751 | } | |
752 | } | |
753 | #else | |
754 | static inline void clear_hwpoisoned_pages(struct page *memmap, int nr_pages) | |
755 | { | |
756 | } | |
757 | #endif | |
758 | ||
4edd7cef DR |
759 | static void free_section_usemap(struct page *memmap, unsigned long *usemap) |
760 | { | |
761 | struct page *usemap_page; | |
4edd7cef DR |
762 | |
763 | if (!usemap) | |
764 | return; | |
765 | ||
766 | usemap_page = virt_to_page(usemap); | |
767 | /* | |
768 | * Check to see if allocation came from hot-plug-add | |
769 | */ | |
770 | if (PageSlab(usemap_page) || PageCompound(usemap_page)) { | |
771 | kfree(usemap); | |
772 | if (memmap) | |
85b35fea | 773 | __kfree_section_memmap(memmap); |
4edd7cef DR |
774 | return; |
775 | } | |
776 | ||
777 | /* | |
778 | * The usemap came from bootmem. This is packed with other usemaps | |
779 | * on the section which has pgdat at boot time. Just keep it as is now. | |
780 | */ | |
781 | ||
81556b02 ZY |
782 | if (memmap) |
783 | free_map_bootmem(memmap); | |
4edd7cef DR |
784 | } |
785 | ||
ea01ea93 BP |
786 | void sparse_remove_one_section(struct zone *zone, struct mem_section *ms) |
787 | { | |
788 | struct page *memmap = NULL; | |
cd099682 TC |
789 | unsigned long *usemap = NULL, flags; |
790 | struct pglist_data *pgdat = zone->zone_pgdat; | |
ea01ea93 | 791 | |
cd099682 | 792 | pgdat_resize_lock(pgdat, &flags); |
ea01ea93 BP |
793 | if (ms->section_mem_map) { |
794 | usemap = ms->pageblock_flags; | |
795 | memmap = sparse_decode_mem_map(ms->section_mem_map, | |
796 | __section_nr(ms)); | |
797 | ms->section_mem_map = 0; | |
798 | ms->pageblock_flags = NULL; | |
799 | } | |
cd099682 | 800 | pgdat_resize_unlock(pgdat, &flags); |
ea01ea93 | 801 | |
95a4774d | 802 | clear_hwpoisoned_pages(memmap, PAGES_PER_SECTION); |
ea01ea93 BP |
803 | free_section_usemap(memmap, usemap); |
804 | } | |
4edd7cef DR |
805 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
806 | #endif /* CONFIG_MEMORY_HOTPLUG */ |