Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
d41dee36 AW |
2 | /* |
3 | * sparse memory mappings. | |
4 | */ | |
d41dee36 | 5 | #include <linux/mm.h> |
5a0e3ad6 | 6 | #include <linux/slab.h> |
d41dee36 | 7 | #include <linux/mmzone.h> |
97ad1087 | 8 | #include <linux/memblock.h> |
3b32123d | 9 | #include <linux/compiler.h> |
0b0acbec | 10 | #include <linux/highmem.h> |
b95f1b31 | 11 | #include <linux/export.h> |
28ae55c9 | 12 | #include <linux/spinlock.h> |
0b0acbec | 13 | #include <linux/vmalloc.h> |
3b32123d | 14 | |
0c0a4a51 | 15 | #include "internal.h" |
d41dee36 | 16 | #include <asm/dma.h> |
8f6aac41 CL |
17 | #include <asm/pgalloc.h> |
18 | #include <asm/pgtable.h> | |
d41dee36 AW |
19 | |
20 | /* | |
21 | * Permanent SPARSEMEM data: | |
22 | * | |
23 | * 1) mem_section - memory sections, mem_map's for valid memory | |
24 | */ | |
3e347261 | 25 | #ifdef CONFIG_SPARSEMEM_EXTREME |
83e3c487 | 26 | struct mem_section **mem_section; |
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 | ||
8a7f97b9 | 68 | if (slab_is_available()) { |
b95046b0 | 69 | section = kzalloc_node(array_size, GFP_KERNEL, nid); |
8a7f97b9 | 70 | } else { |
7e1c4e27 MR |
71 | section = memblock_alloc_node(array_size, SMP_CACHE_BYTES, |
72 | nid); | |
8a7f97b9 MR |
73 | if (!section) |
74 | panic("%s: Failed to allocate %lu bytes nid=%d\n", | |
75 | __func__, array_size, nid); | |
76 | } | |
28ae55c9 DH |
77 | |
78 | return section; | |
3e347261 | 79 | } |
802f192e | 80 | |
a3142c8e | 81 | static int __meminit sparse_index_init(unsigned long section_nr, int nid) |
802f192e | 82 | { |
28ae55c9 DH |
83 | unsigned long root = SECTION_NR_TO_ROOT(section_nr); |
84 | struct mem_section *section; | |
802f192e | 85 | |
ba72b4c8 DW |
86 | /* |
87 | * An existing section is possible in the sub-section hotplug | |
88 | * case. First hot-add instantiates, follow-on hot-add reuses | |
89 | * the existing section. | |
90 | * | |
91 | * The mem_hotplug_lock resolves the apparent race below. | |
92 | */ | |
802f192e | 93 | if (mem_section[root]) |
ba72b4c8 | 94 | return 0; |
3e347261 | 95 | |
28ae55c9 | 96 | section = sparse_index_alloc(nid); |
af0cd5a7 WC |
97 | if (!section) |
98 | return -ENOMEM; | |
28ae55c9 DH |
99 | |
100 | mem_section[root] = section; | |
c1c95183 | 101 | |
9d1936cf | 102 | return 0; |
28ae55c9 DH |
103 | } |
104 | #else /* !SPARSEMEM_EXTREME */ | |
105 | static inline int sparse_index_init(unsigned long section_nr, int nid) | |
106 | { | |
107 | return 0; | |
802f192e | 108 | } |
28ae55c9 DH |
109 | #endif |
110 | ||
91fd8b95 | 111 | #ifdef CONFIG_SPARSEMEM_EXTREME |
2491f0a2 | 112 | unsigned long __section_nr(struct mem_section *ms) |
4ca644d9 DH |
113 | { |
114 | unsigned long root_nr; | |
83e3c487 | 115 | struct mem_section *root = NULL; |
4ca644d9 | 116 | |
12783b00 MK |
117 | for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) { |
118 | root = __nr_to_section(root_nr * SECTIONS_PER_ROOT); | |
4ca644d9 DH |
119 | if (!root) |
120 | continue; | |
121 | ||
122 | if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT))) | |
123 | break; | |
124 | } | |
125 | ||
83e3c487 | 126 | VM_BUG_ON(!root); |
db36a461 | 127 | |
4ca644d9 DH |
128 | return (root_nr * SECTIONS_PER_ROOT) + (ms - root); |
129 | } | |
91fd8b95 | 130 | #else |
2491f0a2 | 131 | unsigned long __section_nr(struct mem_section *ms) |
91fd8b95 | 132 | { |
2491f0a2 | 133 | return (unsigned long)(ms - mem_section[0]); |
91fd8b95 ZC |
134 | } |
135 | #endif | |
4ca644d9 | 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 | ||
c4e1be9e DH |
179 | /* |
180 | * There are a number of times that we loop over NR_MEM_SECTIONS, | |
181 | * looking for section_present() on each. But, when we have very | |
182 | * large physical address spaces, NR_MEM_SECTIONS can also be | |
183 | * very large which makes the loops quite long. | |
184 | * | |
185 | * Keeping track of this gives us an easy way to break out of | |
186 | * those loops early. | |
187 | */ | |
2491f0a2 | 188 | unsigned long __highest_present_section_nr; |
c4e1be9e DH |
189 | static void section_mark_present(struct mem_section *ms) |
190 | { | |
2491f0a2 | 191 | unsigned long section_nr = __section_nr(ms); |
c4e1be9e DH |
192 | |
193 | if (section_nr > __highest_present_section_nr) | |
194 | __highest_present_section_nr = section_nr; | |
195 | ||
196 | ms->section_mem_map |= SECTION_MARKED_PRESENT; | |
197 | } | |
198 | ||
2491f0a2 | 199 | static inline unsigned long next_present_section_nr(unsigned long section_nr) |
c4e1be9e DH |
200 | { |
201 | do { | |
202 | section_nr++; | |
203 | if (present_section_nr(section_nr)) | |
204 | return section_nr; | |
d538c164 | 205 | } while ((section_nr <= __highest_present_section_nr)); |
c4e1be9e DH |
206 | |
207 | return -1; | |
208 | } | |
209 | #define for_each_present_section_nr(start, section_nr) \ | |
210 | for (section_nr = next_present_section_nr(start-1); \ | |
d778015a | 211 | ((section_nr != -1) && \ |
c4e1be9e DH |
212 | (section_nr <= __highest_present_section_nr)); \ |
213 | section_nr = next_present_section_nr(section_nr)) | |
214 | ||
85c77f79 PT |
215 | static inline unsigned long first_present_section_nr(void) |
216 | { | |
217 | return next_present_section_nr(-1); | |
218 | } | |
219 | ||
f46edbd1 DW |
220 | void subsection_mask_set(unsigned long *map, unsigned long pfn, |
221 | unsigned long nr_pages) | |
222 | { | |
223 | int idx = subsection_map_index(pfn); | |
224 | int end = subsection_map_index(pfn + nr_pages - 1); | |
225 | ||
226 | bitmap_set(map, idx, end - idx + 1); | |
227 | } | |
228 | ||
229 | void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages) | |
230 | { | |
231 | int end_sec = pfn_to_section_nr(pfn + nr_pages - 1); | |
9a845030 | 232 | unsigned long nr, start_sec = pfn_to_section_nr(pfn); |
f46edbd1 DW |
233 | |
234 | if (!nr_pages) | |
235 | return; | |
236 | ||
9a845030 | 237 | for (nr = start_sec; nr <= end_sec; nr++) { |
f46edbd1 DW |
238 | struct mem_section *ms; |
239 | unsigned long pfns; | |
240 | ||
241 | pfns = min(nr_pages, PAGES_PER_SECTION | |
242 | - (pfn & ~PAGE_SECTION_MASK)); | |
9a845030 | 243 | ms = __nr_to_section(nr); |
f46edbd1 DW |
244 | subsection_mask_set(ms->usage->subsection_map, pfn, pfns); |
245 | ||
9a845030 | 246 | pr_debug("%s: sec: %lu pfns: %lu set(%d, %d)\n", __func__, nr, |
f46edbd1 DW |
247 | pfns, subsection_map_index(pfn), |
248 | subsection_map_index(pfn + pfns - 1)); | |
249 | ||
250 | pfn += pfns; | |
251 | nr_pages -= pfns; | |
252 | } | |
253 | } | |
254 | ||
2dbb51c4 MG |
255 | /* Record a memory area against a node. */ |
256 | void __init memory_present(int nid, unsigned long start, unsigned long end) | |
257 | { | |
258 | unsigned long pfn; | |
bead9a3a | 259 | |
629a359b KS |
260 | #ifdef CONFIG_SPARSEMEM_EXTREME |
261 | if (unlikely(!mem_section)) { | |
262 | unsigned long size, align; | |
263 | ||
d09cfbbf | 264 | size = sizeof(struct mem_section*) * NR_SECTION_ROOTS; |
629a359b | 265 | align = 1 << (INTERNODE_CACHE_SHIFT); |
eb31d559 | 266 | mem_section = memblock_alloc(size, align); |
8a7f97b9 MR |
267 | if (!mem_section) |
268 | panic("%s: Failed to allocate %lu bytes align=0x%lx\n", | |
269 | __func__, size, align); | |
629a359b KS |
270 | } |
271 | #endif | |
272 | ||
d41dee36 | 273 | start &= PAGE_SECTION_MASK; |
2dbb51c4 | 274 | mminit_validate_memmodel_limits(&start, &end); |
d41dee36 AW |
275 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) { |
276 | unsigned long section = pfn_to_section_nr(pfn); | |
802f192e BP |
277 | struct mem_section *ms; |
278 | ||
279 | sparse_index_init(section, nid); | |
85770ffe | 280 | set_section_nid(section, nid); |
802f192e BP |
281 | |
282 | ms = __nr_to_section(section); | |
c4e1be9e | 283 | if (!ms->section_mem_map) { |
2d070eab MH |
284 | ms->section_mem_map = sparse_encode_early_nid(nid) | |
285 | SECTION_IS_ONLINE; | |
c4e1be9e DH |
286 | section_mark_present(ms); |
287 | } | |
d41dee36 AW |
288 | } |
289 | } | |
290 | ||
9def36e0 LG |
291 | /* |
292 | * Mark all memblocks as present using memory_present(). This is a | |
293 | * convienence function that is useful for a number of arches | |
294 | * to mark all of the systems memory as present during initialization. | |
295 | */ | |
296 | void __init memblocks_present(void) | |
297 | { | |
298 | struct memblock_region *reg; | |
299 | ||
300 | for_each_memblock(memory, reg) { | |
301 | memory_present(memblock_get_region_node(reg), | |
302 | memblock_region_memory_base_pfn(reg), | |
303 | memblock_region_memory_end_pfn(reg)); | |
304 | } | |
305 | } | |
306 | ||
29751f69 AW |
307 | /* |
308 | * Subtle, we encode the real pfn into the mem_map such that | |
309 | * the identity pfn - section_mem_map will return the actual | |
310 | * physical page frame number. | |
311 | */ | |
312 | static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum) | |
313 | { | |
def9b71e PT |
314 | unsigned long coded_mem_map = |
315 | (unsigned long)(mem_map - (section_nr_to_pfn(pnum))); | |
316 | BUILD_BUG_ON(SECTION_MAP_LAST_BIT > (1UL<<PFN_SECTION_SHIFT)); | |
317 | BUG_ON(coded_mem_map & ~SECTION_MAP_MASK); | |
318 | return coded_mem_map; | |
29751f69 AW |
319 | } |
320 | ||
321 | /* | |
ea01ea93 | 322 | * Decode mem_map from the coded memmap |
29751f69 | 323 | */ |
29751f69 AW |
324 | struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum) |
325 | { | |
ea01ea93 BP |
326 | /* mask off the extra low bits of information */ |
327 | coded_mem_map &= SECTION_MAP_MASK; | |
29751f69 AW |
328 | return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum); |
329 | } | |
330 | ||
4e40987f | 331 | static void __meminit sparse_init_one_section(struct mem_section *ms, |
5c0e3066 | 332 | unsigned long pnum, struct page *mem_map, |
326e1b8f | 333 | struct mem_section_usage *usage, unsigned long flags) |
29751f69 | 334 | { |
30c253e6 | 335 | ms->section_mem_map &= ~SECTION_MAP_MASK; |
326e1b8f DW |
336 | ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) |
337 | | SECTION_HAS_MEM_MAP | flags; | |
f1eca35a | 338 | ms->usage = usage; |
29751f69 AW |
339 | } |
340 | ||
f1eca35a | 341 | static unsigned long usemap_size(void) |
5c0e3066 | 342 | { |
60a7a88d | 343 | return BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS) * sizeof(unsigned long); |
5c0e3066 MG |
344 | } |
345 | ||
f1eca35a | 346 | size_t mem_section_usage_size(void) |
5c0e3066 | 347 | { |
f1eca35a | 348 | return sizeof(struct mem_section_usage) + usemap_size(); |
5c0e3066 | 349 | } |
5c0e3066 | 350 | |
48c90682 | 351 | #ifdef CONFIG_MEMORY_HOTREMOVE |
f1eca35a | 352 | static struct mem_section_usage * __init |
a4322e1b | 353 | sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat, |
238305bb | 354 | unsigned long size) |
48c90682 | 355 | { |
f1eca35a | 356 | struct mem_section_usage *usage; |
99ab7b19 | 357 | unsigned long goal, limit; |
99ab7b19 | 358 | int nid; |
48c90682 YG |
359 | /* |
360 | * A page may contain usemaps for other sections preventing the | |
361 | * page being freed and making a section unremovable while | |
c800bcd5 | 362 | * other sections referencing the usemap remain active. Similarly, |
48c90682 YG |
363 | * a pgdat can prevent a section being removed. If section A |
364 | * contains a pgdat and section B contains the usemap, both | |
365 | * sections become inter-dependent. This allocates usemaps | |
366 | * from the same section as the pgdat where possible to avoid | |
367 | * this problem. | |
368 | */ | |
07b4e2bc | 369 | goal = __pa(pgdat) & (PAGE_SECTION_MASK << PAGE_SHIFT); |
99ab7b19 YL |
370 | limit = goal + (1UL << PA_SECTION_SHIFT); |
371 | nid = early_pfn_to_nid(goal >> PAGE_SHIFT); | |
372 | again: | |
f1eca35a DW |
373 | usage = memblock_alloc_try_nid(size, SMP_CACHE_BYTES, goal, limit, nid); |
374 | if (!usage && limit) { | |
99ab7b19 YL |
375 | limit = 0; |
376 | goto again; | |
377 | } | |
f1eca35a | 378 | return usage; |
48c90682 YG |
379 | } |
380 | ||
f1eca35a DW |
381 | static void __init check_usemap_section_nr(int nid, |
382 | struct mem_section_usage *usage) | |
48c90682 YG |
383 | { |
384 | unsigned long usemap_snr, pgdat_snr; | |
83e3c487 KS |
385 | static unsigned long old_usemap_snr; |
386 | static unsigned long old_pgdat_snr; | |
48c90682 YG |
387 | struct pglist_data *pgdat = NODE_DATA(nid); |
388 | int usemap_nid; | |
389 | ||
83e3c487 KS |
390 | /* First call */ |
391 | if (!old_usemap_snr) { | |
392 | old_usemap_snr = NR_MEM_SECTIONS; | |
393 | old_pgdat_snr = NR_MEM_SECTIONS; | |
394 | } | |
395 | ||
f1eca35a | 396 | usemap_snr = pfn_to_section_nr(__pa(usage) >> PAGE_SHIFT); |
48c90682 YG |
397 | pgdat_snr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT); |
398 | if (usemap_snr == pgdat_snr) | |
399 | return; | |
400 | ||
401 | if (old_usemap_snr == usemap_snr && old_pgdat_snr == pgdat_snr) | |
402 | /* skip redundant message */ | |
403 | return; | |
404 | ||
405 | old_usemap_snr = usemap_snr; | |
406 | old_pgdat_snr = pgdat_snr; | |
407 | ||
408 | usemap_nid = sparse_early_nid(__nr_to_section(usemap_snr)); | |
409 | if (usemap_nid != nid) { | |
1170532b JP |
410 | pr_info("node %d must be removed before remove section %ld\n", |
411 | nid, usemap_snr); | |
48c90682 YG |
412 | return; |
413 | } | |
414 | /* | |
415 | * There is a circular dependency. | |
416 | * Some platforms allow un-removable section because they will just | |
417 | * gather other removable sections for dynamic partitioning. | |
418 | * Just notify un-removable section's number here. | |
419 | */ | |
1170532b JP |
420 | pr_info("Section %ld and %ld (node %d) have a circular dependency on usemap and pgdat allocations\n", |
421 | usemap_snr, pgdat_snr, nid); | |
48c90682 YG |
422 | } |
423 | #else | |
f1eca35a | 424 | static struct mem_section_usage * __init |
a4322e1b | 425 | sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat, |
238305bb | 426 | unsigned long size) |
48c90682 | 427 | { |
26fb3dae | 428 | return memblock_alloc_node(size, SMP_CACHE_BYTES, pgdat->node_id); |
48c90682 YG |
429 | } |
430 | ||
f1eca35a DW |
431 | static void __init check_usemap_section_nr(int nid, |
432 | struct mem_section_usage *usage) | |
48c90682 YG |
433 | { |
434 | } | |
435 | #endif /* CONFIG_MEMORY_HOTREMOVE */ | |
436 | ||
35fd1eb1 | 437 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
afda57bc | 438 | static unsigned long __init section_map_size(void) |
35fd1eb1 PT |
439 | { |
440 | return ALIGN(sizeof(struct page) * PAGES_PER_SECTION, PMD_SIZE); | |
441 | } | |
442 | ||
443 | #else | |
afda57bc | 444 | static unsigned long __init section_map_size(void) |
e131c06b PT |
445 | { |
446 | return PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION); | |
447 | } | |
448 | ||
e9c0a3f0 DW |
449 | struct page __init *__populate_section_memmap(unsigned long pfn, |
450 | unsigned long nr_pages, int nid, struct vmem_altmap *altmap) | |
29751f69 | 451 | { |
e131c06b PT |
452 | unsigned long size = section_map_size(); |
453 | struct page *map = sparse_buffer_alloc(size); | |
8a7f97b9 | 454 | phys_addr_t addr = __pa(MAX_DMA_ADDRESS); |
e131c06b PT |
455 | |
456 | if (map) | |
457 | return map; | |
29751f69 | 458 | |
eb31d559 | 459 | map = memblock_alloc_try_nid(size, |
8a7f97b9 | 460 | PAGE_SIZE, addr, |
97ad1087 | 461 | MEMBLOCK_ALLOC_ACCESSIBLE, nid); |
8a7f97b9 MR |
462 | if (!map) |
463 | panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%pa\n", | |
464 | __func__, size, PAGE_SIZE, nid, &addr); | |
465 | ||
8f6aac41 CL |
466 | return map; |
467 | } | |
468 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
469 | ||
35fd1eb1 PT |
470 | static void *sparsemap_buf __meminitdata; |
471 | static void *sparsemap_buf_end __meminitdata; | |
472 | ||
ae831894 LC |
473 | static inline void __meminit sparse_buffer_free(unsigned long size) |
474 | { | |
475 | WARN_ON(!sparsemap_buf || size == 0); | |
476 | memblock_free_early(__pa(sparsemap_buf), size); | |
477 | } | |
478 | ||
afda57bc | 479 | static void __init sparse_buffer_init(unsigned long size, int nid) |
35fd1eb1 | 480 | { |
8a7f97b9 | 481 | phys_addr_t addr = __pa(MAX_DMA_ADDRESS); |
35fd1eb1 PT |
482 | WARN_ON(sparsemap_buf); /* forgot to call sparse_buffer_fini()? */ |
483 | sparsemap_buf = | |
eb31d559 | 484 | memblock_alloc_try_nid_raw(size, PAGE_SIZE, |
8a7f97b9 | 485 | addr, |
97ad1087 | 486 | MEMBLOCK_ALLOC_ACCESSIBLE, nid); |
35fd1eb1 PT |
487 | sparsemap_buf_end = sparsemap_buf + size; |
488 | } | |
489 | ||
afda57bc | 490 | static void __init sparse_buffer_fini(void) |
35fd1eb1 PT |
491 | { |
492 | unsigned long size = sparsemap_buf_end - sparsemap_buf; | |
493 | ||
494 | if (sparsemap_buf && size > 0) | |
ae831894 | 495 | sparse_buffer_free(size); |
35fd1eb1 PT |
496 | sparsemap_buf = NULL; |
497 | } | |
498 | ||
499 | void * __meminit sparse_buffer_alloc(unsigned long size) | |
500 | { | |
501 | void *ptr = NULL; | |
502 | ||
503 | if (sparsemap_buf) { | |
504 | ptr = PTR_ALIGN(sparsemap_buf, size); | |
505 | if (ptr + size > sparsemap_buf_end) | |
506 | ptr = NULL; | |
ae831894 LC |
507 | else { |
508 | /* Free redundant aligned space */ | |
509 | if ((unsigned long)(ptr - sparsemap_buf) > 0) | |
510 | sparse_buffer_free((unsigned long)(ptr - sparsemap_buf)); | |
35fd1eb1 | 511 | sparsemap_buf = ptr + size; |
ae831894 | 512 | } |
35fd1eb1 PT |
513 | } |
514 | return ptr; | |
515 | } | |
516 | ||
3b32123d | 517 | void __weak __meminit vmemmap_populate_print_last(void) |
c2b91e2e YL |
518 | { |
519 | } | |
a4322e1b | 520 | |
85c77f79 PT |
521 | /* |
522 | * Initialize sparse on a specific node. The node spans [pnum_begin, pnum_end) | |
523 | * And number of present sections in this node is map_count. | |
524 | */ | |
525 | static void __init sparse_init_nid(int nid, unsigned long pnum_begin, | |
526 | unsigned long pnum_end, | |
527 | unsigned long map_count) | |
528 | { | |
f1eca35a DW |
529 | struct mem_section_usage *usage; |
530 | unsigned long pnum; | |
85c77f79 PT |
531 | struct page *map; |
532 | ||
f1eca35a DW |
533 | usage = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nid), |
534 | mem_section_usage_size() * map_count); | |
535 | if (!usage) { | |
85c77f79 PT |
536 | pr_err("%s: node[%d] usemap allocation failed", __func__, nid); |
537 | goto failed; | |
538 | } | |
539 | sparse_buffer_init(map_count * section_map_size(), nid); | |
540 | for_each_present_section_nr(pnum_begin, pnum) { | |
e9c0a3f0 DW |
541 | unsigned long pfn = section_nr_to_pfn(pnum); |
542 | ||
85c77f79 PT |
543 | if (pnum >= pnum_end) |
544 | break; | |
545 | ||
e9c0a3f0 DW |
546 | map = __populate_section_memmap(pfn, PAGES_PER_SECTION, |
547 | nid, NULL); | |
85c77f79 PT |
548 | if (!map) { |
549 | pr_err("%s: node[%d] memory map backing failed. Some memory will not be available.", | |
550 | __func__, nid); | |
551 | pnum_begin = pnum; | |
552 | goto failed; | |
553 | } | |
f1eca35a | 554 | check_usemap_section_nr(nid, usage); |
326e1b8f DW |
555 | sparse_init_one_section(__nr_to_section(pnum), pnum, map, usage, |
556 | SECTION_IS_EARLY); | |
f1eca35a | 557 | usage = (void *) usage + mem_section_usage_size(); |
85c77f79 PT |
558 | } |
559 | sparse_buffer_fini(); | |
560 | return; | |
561 | failed: | |
562 | /* We failed to allocate, mark all the following pnums as not present */ | |
563 | for_each_present_section_nr(pnum_begin, pnum) { | |
564 | struct mem_section *ms; | |
565 | ||
566 | if (pnum >= pnum_end) | |
567 | break; | |
568 | ms = __nr_to_section(pnum); | |
569 | ms->section_mem_map = 0; | |
570 | } | |
571 | } | |
572 | ||
573 | /* | |
574 | * Allocate the accumulated non-linear sections, allocate a mem_map | |
575 | * for each and record the physical to section mapping. | |
576 | */ | |
2a3cb8ba | 577 | void __init sparse_init(void) |
85c77f79 PT |
578 | { |
579 | unsigned long pnum_begin = first_present_section_nr(); | |
580 | int nid_begin = sparse_early_nid(__nr_to_section(pnum_begin)); | |
581 | unsigned long pnum_end, map_count = 1; | |
582 | ||
583 | /* Setup pageblock_order for HUGETLB_PAGE_SIZE_VARIABLE */ | |
584 | set_pageblock_order(); | |
585 | ||
586 | for_each_present_section_nr(pnum_begin + 1, pnum_end) { | |
587 | int nid = sparse_early_nid(__nr_to_section(pnum_end)); | |
588 | ||
589 | if (nid == nid_begin) { | |
590 | map_count++; | |
591 | continue; | |
592 | } | |
593 | /* Init node with sections in range [pnum_begin, pnum_end) */ | |
594 | sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count); | |
595 | nid_begin = nid; | |
596 | pnum_begin = pnum_end; | |
597 | map_count = 1; | |
598 | } | |
599 | /* cover the last node */ | |
600 | sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count); | |
601 | vmemmap_populate_print_last(); | |
602 | } | |
603 | ||
193faea9 | 604 | #ifdef CONFIG_MEMORY_HOTPLUG |
2d070eab MH |
605 | |
606 | /* Mark all memory sections within the pfn range as online */ | |
607 | void online_mem_sections(unsigned long start_pfn, unsigned long end_pfn) | |
608 | { | |
609 | unsigned long pfn; | |
610 | ||
611 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
b4ccec41 | 612 | unsigned long section_nr = pfn_to_section_nr(pfn); |
2d070eab MH |
613 | struct mem_section *ms; |
614 | ||
615 | /* onlining code should never touch invalid ranges */ | |
616 | if (WARN_ON(!valid_section_nr(section_nr))) | |
617 | continue; | |
618 | ||
619 | ms = __nr_to_section(section_nr); | |
620 | ms->section_mem_map |= SECTION_IS_ONLINE; | |
621 | } | |
622 | } | |
623 | ||
624 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
9b7ea46a | 625 | /* Mark all memory sections within the pfn range as offline */ |
2d070eab MH |
626 | void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn) |
627 | { | |
628 | unsigned long pfn; | |
629 | ||
630 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
27227c73 | 631 | unsigned long section_nr = pfn_to_section_nr(pfn); |
2d070eab MH |
632 | struct mem_section *ms; |
633 | ||
634 | /* | |
635 | * TODO this needs some double checking. Offlining code makes | |
636 | * sure to check pfn_valid but those checks might be just bogus | |
637 | */ | |
638 | if (WARN_ON(!valid_section_nr(section_nr))) | |
639 | continue; | |
640 | ||
641 | ms = __nr_to_section(section_nr); | |
642 | ms->section_mem_map &= ~SECTION_IS_ONLINE; | |
643 | } | |
644 | } | |
645 | #endif | |
646 | ||
98f3cfc1 | 647 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
e9c0a3f0 DW |
648 | static struct page *populate_section_memmap(unsigned long pfn, |
649 | unsigned long nr_pages, int nid, struct vmem_altmap *altmap) | |
98f3cfc1 | 650 | { |
e9c0a3f0 | 651 | return __populate_section_memmap(pfn, nr_pages, nid, altmap); |
98f3cfc1 | 652 | } |
e9c0a3f0 DW |
653 | |
654 | static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages, | |
24b6d416 | 655 | struct vmem_altmap *altmap) |
98f3cfc1 | 656 | { |
e9c0a3f0 DW |
657 | unsigned long start = (unsigned long) pfn_to_page(pfn); |
658 | unsigned long end = start + nr_pages * sizeof(struct page); | |
0aad818b | 659 | |
24b6d416 | 660 | vmemmap_free(start, end, altmap); |
98f3cfc1 | 661 | } |
81556b02 | 662 | static void free_map_bootmem(struct page *memmap) |
0c0a4a51 | 663 | { |
0aad818b | 664 | unsigned long start = (unsigned long)memmap; |
81556b02 | 665 | unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION); |
0aad818b | 666 | |
24b6d416 | 667 | vmemmap_free(start, end, NULL); |
0c0a4a51 | 668 | } |
98f3cfc1 | 669 | #else |
e9c0a3f0 DW |
670 | struct page *populate_section_memmap(unsigned long pfn, |
671 | unsigned long nr_pages, int nid, struct vmem_altmap *altmap) | |
0b0acbec DH |
672 | { |
673 | struct page *page, *ret; | |
85b35fea | 674 | unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION; |
0b0acbec | 675 | |
f2d0aa5b | 676 | page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size)); |
0b0acbec DH |
677 | if (page) |
678 | goto got_map_page; | |
679 | ||
680 | ret = vmalloc(memmap_size); | |
681 | if (ret) | |
682 | goto got_map_ptr; | |
683 | ||
684 | return NULL; | |
685 | got_map_page: | |
686 | ret = (struct page *)pfn_to_kaddr(page_to_pfn(page)); | |
687 | got_map_ptr: | |
0b0acbec DH |
688 | |
689 | return ret; | |
690 | } | |
691 | ||
e9c0a3f0 | 692 | static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages, |
7b73d978 | 693 | struct vmem_altmap *altmap) |
98f3cfc1 | 694 | { |
e9c0a3f0 | 695 | struct page *memmap = pfn_to_page(pfn); |
98f3cfc1 | 696 | |
9e2779fa | 697 | if (is_vmalloc_addr(memmap)) |
0b0acbec DH |
698 | vfree(memmap); |
699 | else | |
700 | free_pages((unsigned long)memmap, | |
85b35fea | 701 | get_order(sizeof(struct page) * PAGES_PER_SECTION)); |
0b0acbec | 702 | } |
0c0a4a51 | 703 | |
81556b02 | 704 | static void free_map_bootmem(struct page *memmap) |
0c0a4a51 YG |
705 | { |
706 | unsigned long maps_section_nr, removing_section_nr, i; | |
81556b02 | 707 | unsigned long magic, nr_pages; |
ae64ffca | 708 | struct page *page = virt_to_page(memmap); |
0c0a4a51 | 709 | |
81556b02 ZY |
710 | nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page)) |
711 | >> PAGE_SHIFT; | |
712 | ||
0c0a4a51 | 713 | for (i = 0; i < nr_pages; i++, page++) { |
ddffe98d | 714 | magic = (unsigned long) page->freelist; |
0c0a4a51 YG |
715 | |
716 | BUG_ON(magic == NODE_INFO); | |
717 | ||
718 | maps_section_nr = pfn_to_section_nr(page_to_pfn(page)); | |
857e522a | 719 | removing_section_nr = page_private(page); |
0c0a4a51 YG |
720 | |
721 | /* | |
722 | * When this function is called, the removing section is | |
723 | * logical offlined state. This means all pages are isolated | |
724 | * from page allocator. If removing section's memmap is placed | |
725 | * on the same section, it must not be freed. | |
726 | * If it is freed, page allocator may allocate it which will | |
727 | * be removed physically soon. | |
728 | */ | |
729 | if (maps_section_nr != removing_section_nr) | |
730 | put_page_bootmem(page); | |
731 | } | |
732 | } | |
98f3cfc1 | 733 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
0b0acbec | 734 | |
ba72b4c8 DW |
735 | static void section_deactivate(unsigned long pfn, unsigned long nr_pages, |
736 | struct vmem_altmap *altmap) | |
737 | { | |
738 | DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; | |
739 | DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 }; | |
740 | struct mem_section *ms = __pfn_to_section(pfn); | |
741 | bool section_is_early = early_section(ms); | |
742 | struct page *memmap = NULL; | |
743 | unsigned long *subsection_map = ms->usage | |
744 | ? &ms->usage->subsection_map[0] : NULL; | |
745 | ||
746 | subsection_mask_set(map, pfn, nr_pages); | |
747 | if (subsection_map) | |
748 | bitmap_and(tmp, map, subsection_map, SUBSECTIONS_PER_SECTION); | |
749 | ||
750 | if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION), | |
751 | "section already deactivated (%#lx + %ld)\n", | |
752 | pfn, nr_pages)) | |
753 | return; | |
754 | ||
755 | /* | |
756 | * There are 3 cases to handle across two configurations | |
757 | * (SPARSEMEM_VMEMMAP={y,n}): | |
758 | * | |
759 | * 1/ deactivation of a partial hot-added section (only possible | |
760 | * in the SPARSEMEM_VMEMMAP=y case). | |
761 | * a/ section was present at memory init | |
762 | * b/ section was hot-added post memory init | |
763 | * 2/ deactivation of a complete hot-added section | |
764 | * 3/ deactivation of a complete section from memory init | |
765 | * | |
766 | * For 1/, when subsection_map does not empty we will not be | |
767 | * freeing the usage map, but still need to free the vmemmap | |
768 | * range. | |
769 | * | |
770 | * For 2/ and 3/ the SPARSEMEM_VMEMMAP={y,n} cases are unified | |
771 | */ | |
772 | bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION); | |
773 | if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION)) { | |
774 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
775 | ||
776 | if (!section_is_early) { | |
777 | kfree(ms->usage); | |
778 | ms->usage = NULL; | |
779 | } | |
780 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
781 | ms->section_mem_map = sparse_encode_mem_map(NULL, section_nr); | |
782 | } | |
783 | ||
784 | if (section_is_early && memmap) | |
785 | free_map_bootmem(memmap); | |
786 | else | |
787 | depopulate_section_memmap(pfn, nr_pages, altmap); | |
788 | } | |
789 | ||
790 | static struct page * __meminit section_activate(int nid, unsigned long pfn, | |
791 | unsigned long nr_pages, struct vmem_altmap *altmap) | |
792 | { | |
793 | DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; | |
794 | struct mem_section *ms = __pfn_to_section(pfn); | |
795 | struct mem_section_usage *usage = NULL; | |
796 | unsigned long *subsection_map; | |
797 | struct page *memmap; | |
798 | int rc = 0; | |
799 | ||
800 | subsection_mask_set(map, pfn, nr_pages); | |
801 | ||
802 | if (!ms->usage) { | |
803 | usage = kzalloc(mem_section_usage_size(), GFP_KERNEL); | |
804 | if (!usage) | |
805 | return ERR_PTR(-ENOMEM); | |
806 | ms->usage = usage; | |
807 | } | |
808 | subsection_map = &ms->usage->subsection_map[0]; | |
809 | ||
810 | if (bitmap_empty(map, SUBSECTIONS_PER_SECTION)) | |
811 | rc = -EINVAL; | |
812 | else if (bitmap_intersects(map, subsection_map, SUBSECTIONS_PER_SECTION)) | |
813 | rc = -EEXIST; | |
814 | else | |
815 | bitmap_or(subsection_map, map, subsection_map, | |
816 | SUBSECTIONS_PER_SECTION); | |
817 | ||
818 | if (rc) { | |
819 | if (usage) | |
820 | ms->usage = NULL; | |
821 | kfree(usage); | |
822 | return ERR_PTR(rc); | |
823 | } | |
824 | ||
825 | /* | |
826 | * The early init code does not consider partially populated | |
827 | * initial sections, it simply assumes that memory will never be | |
828 | * referenced. If we hot-add memory into such a section then we | |
829 | * do not need to populate the memmap and can simply reuse what | |
830 | * is already there. | |
831 | */ | |
832 | if (nr_pages < PAGES_PER_SECTION && early_section(ms)) | |
833 | return pfn_to_page(pfn); | |
834 | ||
835 | memmap = populate_section_memmap(pfn, nr_pages, nid, altmap); | |
836 | if (!memmap) { | |
837 | section_deactivate(pfn, nr_pages, altmap); | |
838 | return ERR_PTR(-ENOMEM); | |
839 | } | |
840 | ||
841 | return memmap; | |
842 | } | |
843 | ||
7567cfc5 | 844 | /** |
ba72b4c8 | 845 | * sparse_add_section - add a memory section, or populate an existing one |
7567cfc5 BH |
846 | * @nid: The node to add section on |
847 | * @start_pfn: start pfn of the memory range | |
ba72b4c8 | 848 | * @nr_pages: number of pfns to add in the section |
7567cfc5 BH |
849 | * @altmap: device page map |
850 | * | |
851 | * This is only intended for hotplug. | |
852 | * | |
853 | * Return: | |
854 | * * 0 - On success. | |
855 | * * -EEXIST - Section has been present. | |
856 | * * -ENOMEM - Out of memory. | |
29751f69 | 857 | */ |
7ea62160 DW |
858 | int __meminit sparse_add_section(int nid, unsigned long start_pfn, |
859 | unsigned long nr_pages, struct vmem_altmap *altmap) | |
29751f69 | 860 | { |
0b0acbec | 861 | unsigned long section_nr = pfn_to_section_nr(start_pfn); |
0b0acbec DH |
862 | struct mem_section *ms; |
863 | struct page *memmap; | |
0b0acbec | 864 | int ret; |
29751f69 | 865 | |
4e0d2e7e | 866 | ret = sparse_index_init(section_nr, nid); |
ba72b4c8 | 867 | if (ret < 0) |
bbd06825 | 868 | return ret; |
0b0acbec | 869 | |
ba72b4c8 DW |
870 | memmap = section_activate(nid, start_pfn, nr_pages, altmap); |
871 | if (IS_ERR(memmap)) | |
872 | return PTR_ERR(memmap); | |
5c0e3066 | 873 | |
d0dc12e8 PT |
874 | /* |
875 | * Poison uninitialized struct pages in order to catch invalid flags | |
876 | * combinations. | |
877 | */ | |
ba72b4c8 | 878 | page_init_poison(pfn_to_page(start_pfn), sizeof(struct page) * nr_pages); |
3ac19f8e | 879 | |
ba72b4c8 | 880 | ms = __pfn_to_section(start_pfn); |
26f26bed | 881 | set_section_nid(section_nr, nid); |
c4e1be9e | 882 | section_mark_present(ms); |
0b0acbec | 883 | |
ba72b4c8 DW |
884 | /* Align memmap to section boundary in the subsection case */ |
885 | if (section_nr_to_pfn(section_nr) != start_pfn) | |
886 | memmap = pfn_to_kaddr(section_nr_to_pfn(section_nr)); | |
887 | sparse_init_one_section(ms, section_nr, memmap, ms->usage, 0); | |
888 | ||
889 | return 0; | |
29751f69 | 890 | } |
ea01ea93 | 891 | |
95a4774d WC |
892 | #ifdef CONFIG_MEMORY_FAILURE |
893 | static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages) | |
894 | { | |
895 | int i; | |
896 | ||
897 | if (!memmap) | |
898 | return; | |
899 | ||
5eb570a8 BS |
900 | /* |
901 | * A further optimization is to have per section refcounted | |
902 | * num_poisoned_pages. But that would need more space per memmap, so | |
903 | * for now just do a quick global check to speed up this routine in the | |
904 | * absence of bad pages. | |
905 | */ | |
906 | if (atomic_long_read(&num_poisoned_pages) == 0) | |
907 | return; | |
908 | ||
4b94ffdc | 909 | for (i = 0; i < nr_pages; i++) { |
95a4774d | 910 | if (PageHWPoison(&memmap[i])) { |
293c07e3 | 911 | atomic_long_sub(1, &num_poisoned_pages); |
95a4774d WC |
912 | ClearPageHWPoison(&memmap[i]); |
913 | } | |
914 | } | |
915 | } | |
916 | #else | |
917 | static inline void clear_hwpoisoned_pages(struct page *memmap, int nr_pages) | |
918 | { | |
919 | } | |
920 | #endif | |
921 | ||
ba72b4c8 | 922 | void sparse_remove_section(struct mem_section *ms, unsigned long pfn, |
7ea62160 DW |
923 | unsigned long nr_pages, unsigned long map_offset, |
924 | struct vmem_altmap *altmap) | |
ea01ea93 | 925 | { |
ba72b4c8 DW |
926 | clear_hwpoisoned_pages(pfn_to_page(pfn) + map_offset, |
927 | nr_pages - map_offset); | |
928 | section_deactivate(pfn, nr_pages, altmap); | |
ea01ea93 | 929 | } |
4edd7cef | 930 | #endif /* CONFIG_MEMORY_HOTPLUG */ |