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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> |
9f82883c AS |
14 | #include <linux/swap.h> |
15 | #include <linux/swapops.h> | |
3b32123d | 16 | |
0c0a4a51 | 17 | #include "internal.h" |
d41dee36 | 18 | #include <asm/dma.h> |
8f6aac41 CL |
19 | #include <asm/pgalloc.h> |
20 | #include <asm/pgtable.h> | |
d41dee36 AW |
21 | |
22 | /* | |
23 | * Permanent SPARSEMEM data: | |
24 | * | |
25 | * 1) mem_section - memory sections, mem_map's for valid memory | |
26 | */ | |
3e347261 | 27 | #ifdef CONFIG_SPARSEMEM_EXTREME |
83e3c487 | 28 | struct mem_section **mem_section; |
3e347261 BP |
29 | #else |
30 | struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT] | |
22fc6ecc | 31 | ____cacheline_internodealigned_in_smp; |
3e347261 BP |
32 | #endif |
33 | EXPORT_SYMBOL(mem_section); | |
34 | ||
89689ae7 CL |
35 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
36 | /* | |
37 | * If we did not store the node number in the page then we have to | |
38 | * do a lookup in the section_to_node_table in order to find which | |
39 | * node the page belongs to. | |
40 | */ | |
41 | #if MAX_NUMNODES <= 256 | |
42 | static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; | |
43 | #else | |
44 | static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; | |
45 | #endif | |
46 | ||
33dd4e0e | 47 | int page_to_nid(const struct page *page) |
89689ae7 CL |
48 | { |
49 | return section_to_node_table[page_to_section(page)]; | |
50 | } | |
51 | EXPORT_SYMBOL(page_to_nid); | |
85770ffe AW |
52 | |
53 | static void set_section_nid(unsigned long section_nr, int nid) | |
54 | { | |
55 | section_to_node_table[section_nr] = nid; | |
56 | } | |
57 | #else /* !NODE_NOT_IN_PAGE_FLAGS */ | |
58 | static inline void set_section_nid(unsigned long section_nr, int nid) | |
59 | { | |
60 | } | |
89689ae7 CL |
61 | #endif |
62 | ||
3e347261 | 63 | #ifdef CONFIG_SPARSEMEM_EXTREME |
bd721ea7 | 64 | static noinline struct mem_section __ref *sparse_index_alloc(int nid) |
28ae55c9 DH |
65 | { |
66 | struct mem_section *section = NULL; | |
67 | unsigned long array_size = SECTIONS_PER_ROOT * | |
68 | sizeof(struct mem_section); | |
69 | ||
8a7f97b9 | 70 | if (slab_is_available()) { |
b95046b0 | 71 | section = kzalloc_node(array_size, GFP_KERNEL, nid); |
8a7f97b9 | 72 | } else { |
7e1c4e27 MR |
73 | section = memblock_alloc_node(array_size, SMP_CACHE_BYTES, |
74 | nid); | |
8a7f97b9 MR |
75 | if (!section) |
76 | panic("%s: Failed to allocate %lu bytes nid=%d\n", | |
77 | __func__, array_size, nid); | |
78 | } | |
28ae55c9 DH |
79 | |
80 | return section; | |
3e347261 | 81 | } |
802f192e | 82 | |
a3142c8e | 83 | static int __meminit sparse_index_init(unsigned long section_nr, int nid) |
802f192e | 84 | { |
28ae55c9 DH |
85 | unsigned long root = SECTION_NR_TO_ROOT(section_nr); |
86 | struct mem_section *section; | |
802f192e | 87 | |
ba72b4c8 DW |
88 | /* |
89 | * An existing section is possible in the sub-section hotplug | |
90 | * case. First hot-add instantiates, follow-on hot-add reuses | |
91 | * the existing section. | |
92 | * | |
93 | * The mem_hotplug_lock resolves the apparent race below. | |
94 | */ | |
802f192e | 95 | if (mem_section[root]) |
ba72b4c8 | 96 | return 0; |
3e347261 | 97 | |
28ae55c9 | 98 | section = sparse_index_alloc(nid); |
af0cd5a7 WC |
99 | if (!section) |
100 | return -ENOMEM; | |
28ae55c9 DH |
101 | |
102 | mem_section[root] = section; | |
c1c95183 | 103 | |
9d1936cf | 104 | return 0; |
28ae55c9 DH |
105 | } |
106 | #else /* !SPARSEMEM_EXTREME */ | |
107 | static inline int sparse_index_init(unsigned long section_nr, int nid) | |
108 | { | |
109 | return 0; | |
802f192e | 110 | } |
28ae55c9 DH |
111 | #endif |
112 | ||
91fd8b95 | 113 | #ifdef CONFIG_SPARSEMEM_EXTREME |
2491f0a2 | 114 | unsigned long __section_nr(struct mem_section *ms) |
4ca644d9 DH |
115 | { |
116 | unsigned long root_nr; | |
83e3c487 | 117 | struct mem_section *root = NULL; |
4ca644d9 | 118 | |
12783b00 MK |
119 | for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) { |
120 | root = __nr_to_section(root_nr * SECTIONS_PER_ROOT); | |
4ca644d9 DH |
121 | if (!root) |
122 | continue; | |
123 | ||
124 | if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT))) | |
125 | break; | |
126 | } | |
127 | ||
83e3c487 | 128 | VM_BUG_ON(!root); |
db36a461 | 129 | |
4ca644d9 DH |
130 | return (root_nr * SECTIONS_PER_ROOT) + (ms - root); |
131 | } | |
91fd8b95 | 132 | #else |
2491f0a2 | 133 | unsigned long __section_nr(struct mem_section *ms) |
91fd8b95 | 134 | { |
2491f0a2 | 135 | return (unsigned long)(ms - mem_section[0]); |
91fd8b95 ZC |
136 | } |
137 | #endif | |
4ca644d9 | 138 | |
30c253e6 AW |
139 | /* |
140 | * During early boot, before section_mem_map is used for an actual | |
141 | * mem_map, we use section_mem_map to store the section's NUMA | |
142 | * node. This keeps us from having to use another data structure. The | |
143 | * node information is cleared just before we store the real mem_map. | |
144 | */ | |
145 | static inline unsigned long sparse_encode_early_nid(int nid) | |
146 | { | |
147 | return (nid << SECTION_NID_SHIFT); | |
148 | } | |
149 | ||
150 | static inline int sparse_early_nid(struct mem_section *section) | |
151 | { | |
152 | return (section->section_mem_map >> SECTION_NID_SHIFT); | |
153 | } | |
154 | ||
2dbb51c4 MG |
155 | /* Validate the physical addressing limitations of the model */ |
156 | void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
157 | unsigned long *end_pfn) | |
d41dee36 | 158 | { |
2dbb51c4 | 159 | unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT); |
d41dee36 | 160 | |
bead9a3a IM |
161 | /* |
162 | * Sanity checks - do not allow an architecture to pass | |
163 | * in larger pfns than the maximum scope of sparsemem: | |
164 | */ | |
2dbb51c4 MG |
165 | if (*start_pfn > max_sparsemem_pfn) { |
166 | mminit_dprintk(MMINIT_WARNING, "pfnvalidation", | |
167 | "Start of range %lu -> %lu exceeds SPARSEMEM max %lu\n", | |
168 | *start_pfn, *end_pfn, max_sparsemem_pfn); | |
169 | WARN_ON_ONCE(1); | |
170 | *start_pfn = max_sparsemem_pfn; | |
171 | *end_pfn = max_sparsemem_pfn; | |
ef161a98 | 172 | } else if (*end_pfn > max_sparsemem_pfn) { |
2dbb51c4 MG |
173 | mminit_dprintk(MMINIT_WARNING, "pfnvalidation", |
174 | "End of range %lu -> %lu exceeds SPARSEMEM max %lu\n", | |
175 | *start_pfn, *end_pfn, max_sparsemem_pfn); | |
176 | WARN_ON_ONCE(1); | |
177 | *end_pfn = max_sparsemem_pfn; | |
178 | } | |
179 | } | |
180 | ||
c4e1be9e DH |
181 | /* |
182 | * There are a number of times that we loop over NR_MEM_SECTIONS, | |
183 | * looking for section_present() on each. But, when we have very | |
184 | * large physical address spaces, NR_MEM_SECTIONS can also be | |
185 | * very large which makes the loops quite long. | |
186 | * | |
187 | * Keeping track of this gives us an easy way to break out of | |
188 | * those loops early. | |
189 | */ | |
2491f0a2 | 190 | unsigned long __highest_present_section_nr; |
c4e1be9e DH |
191 | static void section_mark_present(struct mem_section *ms) |
192 | { | |
2491f0a2 | 193 | unsigned long section_nr = __section_nr(ms); |
c4e1be9e DH |
194 | |
195 | if (section_nr > __highest_present_section_nr) | |
196 | __highest_present_section_nr = section_nr; | |
197 | ||
198 | ms->section_mem_map |= SECTION_MARKED_PRESENT; | |
199 | } | |
200 | ||
2491f0a2 | 201 | static inline unsigned long next_present_section_nr(unsigned long section_nr) |
c4e1be9e DH |
202 | { |
203 | do { | |
204 | section_nr++; | |
205 | if (present_section_nr(section_nr)) | |
206 | return section_nr; | |
d538c164 | 207 | } while ((section_nr <= __highest_present_section_nr)); |
c4e1be9e DH |
208 | |
209 | return -1; | |
210 | } | |
211 | #define for_each_present_section_nr(start, section_nr) \ | |
212 | for (section_nr = next_present_section_nr(start-1); \ | |
d778015a | 213 | ((section_nr != -1) && \ |
c4e1be9e DH |
214 | (section_nr <= __highest_present_section_nr)); \ |
215 | section_nr = next_present_section_nr(section_nr)) | |
216 | ||
85c77f79 PT |
217 | static inline unsigned long first_present_section_nr(void) |
218 | { | |
219 | return next_present_section_nr(-1); | |
220 | } | |
221 | ||
758b8db4 | 222 | static void subsection_mask_set(unsigned long *map, unsigned long pfn, |
f46edbd1 DW |
223 | unsigned long nr_pages) |
224 | { | |
225 | int idx = subsection_map_index(pfn); | |
226 | int end = subsection_map_index(pfn + nr_pages - 1); | |
227 | ||
228 | bitmap_set(map, idx, end - idx + 1); | |
229 | } | |
230 | ||
231 | void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages) | |
232 | { | |
233 | int end_sec = pfn_to_section_nr(pfn + nr_pages - 1); | |
9a845030 | 234 | unsigned long nr, start_sec = pfn_to_section_nr(pfn); |
f46edbd1 DW |
235 | |
236 | if (!nr_pages) | |
237 | return; | |
238 | ||
9a845030 | 239 | for (nr = start_sec; nr <= end_sec; nr++) { |
f46edbd1 DW |
240 | struct mem_section *ms; |
241 | unsigned long pfns; | |
242 | ||
243 | pfns = min(nr_pages, PAGES_PER_SECTION | |
244 | - (pfn & ~PAGE_SECTION_MASK)); | |
9a845030 | 245 | ms = __nr_to_section(nr); |
f46edbd1 DW |
246 | subsection_mask_set(ms->usage->subsection_map, pfn, pfns); |
247 | ||
9a845030 | 248 | pr_debug("%s: sec: %lu pfns: %lu set(%d, %d)\n", __func__, nr, |
f46edbd1 DW |
249 | pfns, subsection_map_index(pfn), |
250 | subsection_map_index(pfn + pfns - 1)); | |
251 | ||
252 | pfn += pfns; | |
253 | nr_pages -= pfns; | |
254 | } | |
255 | } | |
256 | ||
2dbb51c4 MG |
257 | /* Record a memory area against a node. */ |
258 | void __init memory_present(int nid, unsigned long start, unsigned long end) | |
259 | { | |
260 | unsigned long pfn; | |
bead9a3a | 261 | |
629a359b KS |
262 | #ifdef CONFIG_SPARSEMEM_EXTREME |
263 | if (unlikely(!mem_section)) { | |
264 | unsigned long size, align; | |
265 | ||
d09cfbbf | 266 | size = sizeof(struct mem_section*) * NR_SECTION_ROOTS; |
629a359b | 267 | align = 1 << (INTERNODE_CACHE_SHIFT); |
eb31d559 | 268 | mem_section = memblock_alloc(size, align); |
8a7f97b9 MR |
269 | if (!mem_section) |
270 | panic("%s: Failed to allocate %lu bytes align=0x%lx\n", | |
271 | __func__, size, align); | |
629a359b KS |
272 | } |
273 | #endif | |
274 | ||
d41dee36 | 275 | start &= PAGE_SECTION_MASK; |
2dbb51c4 | 276 | mminit_validate_memmodel_limits(&start, &end); |
d41dee36 AW |
277 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) { |
278 | unsigned long section = pfn_to_section_nr(pfn); | |
802f192e BP |
279 | struct mem_section *ms; |
280 | ||
281 | sparse_index_init(section, nid); | |
85770ffe | 282 | set_section_nid(section, nid); |
802f192e BP |
283 | |
284 | ms = __nr_to_section(section); | |
c4e1be9e | 285 | if (!ms->section_mem_map) { |
2d070eab MH |
286 | ms->section_mem_map = sparse_encode_early_nid(nid) | |
287 | SECTION_IS_ONLINE; | |
c4e1be9e DH |
288 | section_mark_present(ms); |
289 | } | |
d41dee36 AW |
290 | } |
291 | } | |
292 | ||
9def36e0 LG |
293 | /* |
294 | * Mark all memblocks as present using memory_present(). This is a | |
295 | * convienence function that is useful for a number of arches | |
296 | * to mark all of the systems memory as present during initialization. | |
297 | */ | |
298 | void __init memblocks_present(void) | |
299 | { | |
300 | struct memblock_region *reg; | |
301 | ||
302 | for_each_memblock(memory, reg) { | |
303 | memory_present(memblock_get_region_node(reg), | |
304 | memblock_region_memory_base_pfn(reg), | |
305 | memblock_region_memory_end_pfn(reg)); | |
306 | } | |
307 | } | |
308 | ||
29751f69 AW |
309 | /* |
310 | * Subtle, we encode the real pfn into the mem_map such that | |
311 | * the identity pfn - section_mem_map will return the actual | |
312 | * physical page frame number. | |
313 | */ | |
314 | static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum) | |
315 | { | |
def9b71e PT |
316 | unsigned long coded_mem_map = |
317 | (unsigned long)(mem_map - (section_nr_to_pfn(pnum))); | |
318 | BUILD_BUG_ON(SECTION_MAP_LAST_BIT > (1UL<<PFN_SECTION_SHIFT)); | |
319 | BUG_ON(coded_mem_map & ~SECTION_MAP_MASK); | |
320 | return coded_mem_map; | |
29751f69 AW |
321 | } |
322 | ||
323 | /* | |
ea01ea93 | 324 | * Decode mem_map from the coded memmap |
29751f69 | 325 | */ |
29751f69 AW |
326 | struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum) |
327 | { | |
ea01ea93 BP |
328 | /* mask off the extra low bits of information */ |
329 | coded_mem_map &= SECTION_MAP_MASK; | |
29751f69 AW |
330 | return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum); |
331 | } | |
332 | ||
4e40987f | 333 | static void __meminit sparse_init_one_section(struct mem_section *ms, |
5c0e3066 | 334 | unsigned long pnum, struct page *mem_map, |
326e1b8f | 335 | struct mem_section_usage *usage, unsigned long flags) |
29751f69 | 336 | { |
30c253e6 | 337 | ms->section_mem_map &= ~SECTION_MAP_MASK; |
326e1b8f DW |
338 | ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) |
339 | | SECTION_HAS_MEM_MAP | flags; | |
f1eca35a | 340 | ms->usage = usage; |
29751f69 AW |
341 | } |
342 | ||
f1eca35a | 343 | static unsigned long usemap_size(void) |
5c0e3066 | 344 | { |
60a7a88d | 345 | return BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS) * sizeof(unsigned long); |
5c0e3066 MG |
346 | } |
347 | ||
f1eca35a | 348 | size_t mem_section_usage_size(void) |
5c0e3066 | 349 | { |
f1eca35a | 350 | return sizeof(struct mem_section_usage) + usemap_size(); |
5c0e3066 | 351 | } |
5c0e3066 | 352 | |
48c90682 | 353 | #ifdef CONFIG_MEMORY_HOTREMOVE |
f1eca35a | 354 | static struct mem_section_usage * __init |
a4322e1b | 355 | sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat, |
238305bb | 356 | unsigned long size) |
48c90682 | 357 | { |
f1eca35a | 358 | struct mem_section_usage *usage; |
99ab7b19 | 359 | unsigned long goal, limit; |
99ab7b19 | 360 | int nid; |
48c90682 YG |
361 | /* |
362 | * A page may contain usemaps for other sections preventing the | |
363 | * page being freed and making a section unremovable while | |
c800bcd5 | 364 | * other sections referencing the usemap remain active. Similarly, |
48c90682 YG |
365 | * a pgdat can prevent a section being removed. If section A |
366 | * contains a pgdat and section B contains the usemap, both | |
367 | * sections become inter-dependent. This allocates usemaps | |
368 | * from the same section as the pgdat where possible to avoid | |
369 | * this problem. | |
370 | */ | |
07b4e2bc | 371 | goal = __pa(pgdat) & (PAGE_SECTION_MASK << PAGE_SHIFT); |
99ab7b19 YL |
372 | limit = goal + (1UL << PA_SECTION_SHIFT); |
373 | nid = early_pfn_to_nid(goal >> PAGE_SHIFT); | |
374 | again: | |
f1eca35a DW |
375 | usage = memblock_alloc_try_nid(size, SMP_CACHE_BYTES, goal, limit, nid); |
376 | if (!usage && limit) { | |
99ab7b19 YL |
377 | limit = 0; |
378 | goto again; | |
379 | } | |
f1eca35a | 380 | return usage; |
48c90682 YG |
381 | } |
382 | ||
f1eca35a DW |
383 | static void __init check_usemap_section_nr(int nid, |
384 | struct mem_section_usage *usage) | |
48c90682 YG |
385 | { |
386 | unsigned long usemap_snr, pgdat_snr; | |
83e3c487 KS |
387 | static unsigned long old_usemap_snr; |
388 | static unsigned long old_pgdat_snr; | |
48c90682 YG |
389 | struct pglist_data *pgdat = NODE_DATA(nid); |
390 | int usemap_nid; | |
391 | ||
83e3c487 KS |
392 | /* First call */ |
393 | if (!old_usemap_snr) { | |
394 | old_usemap_snr = NR_MEM_SECTIONS; | |
395 | old_pgdat_snr = NR_MEM_SECTIONS; | |
396 | } | |
397 | ||
f1eca35a | 398 | usemap_snr = pfn_to_section_nr(__pa(usage) >> PAGE_SHIFT); |
48c90682 YG |
399 | pgdat_snr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT); |
400 | if (usemap_snr == pgdat_snr) | |
401 | return; | |
402 | ||
403 | if (old_usemap_snr == usemap_snr && old_pgdat_snr == pgdat_snr) | |
404 | /* skip redundant message */ | |
405 | return; | |
406 | ||
407 | old_usemap_snr = usemap_snr; | |
408 | old_pgdat_snr = pgdat_snr; | |
409 | ||
410 | usemap_nid = sparse_early_nid(__nr_to_section(usemap_snr)); | |
411 | if (usemap_nid != nid) { | |
1170532b JP |
412 | pr_info("node %d must be removed before remove section %ld\n", |
413 | nid, usemap_snr); | |
48c90682 YG |
414 | return; |
415 | } | |
416 | /* | |
417 | * There is a circular dependency. | |
418 | * Some platforms allow un-removable section because they will just | |
419 | * gather other removable sections for dynamic partitioning. | |
420 | * Just notify un-removable section's number here. | |
421 | */ | |
1170532b JP |
422 | pr_info("Section %ld and %ld (node %d) have a circular dependency on usemap and pgdat allocations\n", |
423 | usemap_snr, pgdat_snr, nid); | |
48c90682 YG |
424 | } |
425 | #else | |
f1eca35a | 426 | static struct mem_section_usage * __init |
a4322e1b | 427 | sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat, |
238305bb | 428 | unsigned long size) |
48c90682 | 429 | { |
26fb3dae | 430 | return memblock_alloc_node(size, SMP_CACHE_BYTES, pgdat->node_id); |
48c90682 YG |
431 | } |
432 | ||
f1eca35a DW |
433 | static void __init check_usemap_section_nr(int nid, |
434 | struct mem_section_usage *usage) | |
48c90682 YG |
435 | { |
436 | } | |
437 | #endif /* CONFIG_MEMORY_HOTREMOVE */ | |
438 | ||
35fd1eb1 | 439 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
afda57bc | 440 | static unsigned long __init section_map_size(void) |
35fd1eb1 PT |
441 | { |
442 | return ALIGN(sizeof(struct page) * PAGES_PER_SECTION, PMD_SIZE); | |
443 | } | |
444 | ||
445 | #else | |
afda57bc | 446 | static unsigned long __init section_map_size(void) |
e131c06b PT |
447 | { |
448 | return PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION); | |
449 | } | |
450 | ||
e9c0a3f0 DW |
451 | struct page __init *__populate_section_memmap(unsigned long pfn, |
452 | unsigned long nr_pages, int nid, struct vmem_altmap *altmap) | |
29751f69 | 453 | { |
e131c06b PT |
454 | unsigned long size = section_map_size(); |
455 | struct page *map = sparse_buffer_alloc(size); | |
8a7f97b9 | 456 | phys_addr_t addr = __pa(MAX_DMA_ADDRESS); |
e131c06b PT |
457 | |
458 | if (map) | |
459 | return map; | |
29751f69 | 460 | |
eb31d559 | 461 | map = memblock_alloc_try_nid(size, |
8a7f97b9 | 462 | PAGE_SIZE, addr, |
97ad1087 | 463 | MEMBLOCK_ALLOC_ACCESSIBLE, nid); |
8a7f97b9 MR |
464 | if (!map) |
465 | panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%pa\n", | |
466 | __func__, size, PAGE_SIZE, nid, &addr); | |
467 | ||
8f6aac41 CL |
468 | return map; |
469 | } | |
470 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
471 | ||
35fd1eb1 PT |
472 | static void *sparsemap_buf __meminitdata; |
473 | static void *sparsemap_buf_end __meminitdata; | |
474 | ||
ae831894 LC |
475 | static inline void __meminit sparse_buffer_free(unsigned long size) |
476 | { | |
477 | WARN_ON(!sparsemap_buf || size == 0); | |
478 | memblock_free_early(__pa(sparsemap_buf), size); | |
479 | } | |
480 | ||
afda57bc | 481 | static void __init sparse_buffer_init(unsigned long size, int nid) |
35fd1eb1 | 482 | { |
8a7f97b9 | 483 | phys_addr_t addr = __pa(MAX_DMA_ADDRESS); |
35fd1eb1 PT |
484 | WARN_ON(sparsemap_buf); /* forgot to call sparse_buffer_fini()? */ |
485 | sparsemap_buf = | |
eb31d559 | 486 | memblock_alloc_try_nid_raw(size, PAGE_SIZE, |
8a7f97b9 | 487 | addr, |
97ad1087 | 488 | MEMBLOCK_ALLOC_ACCESSIBLE, nid); |
35fd1eb1 PT |
489 | sparsemap_buf_end = sparsemap_buf + size; |
490 | } | |
491 | ||
afda57bc | 492 | static void __init sparse_buffer_fini(void) |
35fd1eb1 PT |
493 | { |
494 | unsigned long size = sparsemap_buf_end - sparsemap_buf; | |
495 | ||
496 | if (sparsemap_buf && size > 0) | |
ae831894 | 497 | sparse_buffer_free(size); |
35fd1eb1 PT |
498 | sparsemap_buf = NULL; |
499 | } | |
500 | ||
501 | void * __meminit sparse_buffer_alloc(unsigned long size) | |
502 | { | |
503 | void *ptr = NULL; | |
504 | ||
505 | if (sparsemap_buf) { | |
db57e98d | 506 | ptr = (void *) roundup((unsigned long)sparsemap_buf, size); |
35fd1eb1 PT |
507 | if (ptr + size > sparsemap_buf_end) |
508 | ptr = NULL; | |
ae831894 LC |
509 | else { |
510 | /* Free redundant aligned space */ | |
511 | if ((unsigned long)(ptr - sparsemap_buf) > 0) | |
512 | sparse_buffer_free((unsigned long)(ptr - sparsemap_buf)); | |
35fd1eb1 | 513 | sparsemap_buf = ptr + size; |
ae831894 | 514 | } |
35fd1eb1 PT |
515 | } |
516 | return ptr; | |
517 | } | |
518 | ||
3b32123d | 519 | void __weak __meminit vmemmap_populate_print_last(void) |
c2b91e2e YL |
520 | { |
521 | } | |
a4322e1b | 522 | |
85c77f79 PT |
523 | /* |
524 | * Initialize sparse on a specific node. The node spans [pnum_begin, pnum_end) | |
525 | * And number of present sections in this node is map_count. | |
526 | */ | |
527 | static void __init sparse_init_nid(int nid, unsigned long pnum_begin, | |
528 | unsigned long pnum_end, | |
529 | unsigned long map_count) | |
530 | { | |
f1eca35a DW |
531 | struct mem_section_usage *usage; |
532 | unsigned long pnum; | |
85c77f79 PT |
533 | struct page *map; |
534 | ||
f1eca35a DW |
535 | usage = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nid), |
536 | mem_section_usage_size() * map_count); | |
537 | if (!usage) { | |
85c77f79 PT |
538 | pr_err("%s: node[%d] usemap allocation failed", __func__, nid); |
539 | goto failed; | |
540 | } | |
541 | sparse_buffer_init(map_count * section_map_size(), nid); | |
542 | for_each_present_section_nr(pnum_begin, pnum) { | |
e9c0a3f0 DW |
543 | unsigned long pfn = section_nr_to_pfn(pnum); |
544 | ||
85c77f79 PT |
545 | if (pnum >= pnum_end) |
546 | break; | |
547 | ||
e9c0a3f0 DW |
548 | map = __populate_section_memmap(pfn, PAGES_PER_SECTION, |
549 | nid, NULL); | |
85c77f79 PT |
550 | if (!map) { |
551 | pr_err("%s: node[%d] memory map backing failed. Some memory will not be available.", | |
552 | __func__, nid); | |
553 | pnum_begin = pnum; | |
554 | goto failed; | |
555 | } | |
f1eca35a | 556 | check_usemap_section_nr(nid, usage); |
326e1b8f DW |
557 | sparse_init_one_section(__nr_to_section(pnum), pnum, map, usage, |
558 | SECTION_IS_EARLY); | |
f1eca35a | 559 | usage = (void *) usage + mem_section_usage_size(); |
85c77f79 PT |
560 | } |
561 | sparse_buffer_fini(); | |
562 | return; | |
563 | failed: | |
564 | /* We failed to allocate, mark all the following pnums as not present */ | |
565 | for_each_present_section_nr(pnum_begin, pnum) { | |
566 | struct mem_section *ms; | |
567 | ||
568 | if (pnum >= pnum_end) | |
569 | break; | |
570 | ms = __nr_to_section(pnum); | |
571 | ms->section_mem_map = 0; | |
572 | } | |
573 | } | |
574 | ||
575 | /* | |
576 | * Allocate the accumulated non-linear sections, allocate a mem_map | |
577 | * for each and record the physical to section mapping. | |
578 | */ | |
2a3cb8ba | 579 | void __init sparse_init(void) |
85c77f79 PT |
580 | { |
581 | unsigned long pnum_begin = first_present_section_nr(); | |
582 | int nid_begin = sparse_early_nid(__nr_to_section(pnum_begin)); | |
583 | unsigned long pnum_end, map_count = 1; | |
584 | ||
585 | /* Setup pageblock_order for HUGETLB_PAGE_SIZE_VARIABLE */ | |
586 | set_pageblock_order(); | |
587 | ||
588 | for_each_present_section_nr(pnum_begin + 1, pnum_end) { | |
589 | int nid = sparse_early_nid(__nr_to_section(pnum_end)); | |
590 | ||
591 | if (nid == nid_begin) { | |
592 | map_count++; | |
593 | continue; | |
594 | } | |
595 | /* Init node with sections in range [pnum_begin, pnum_end) */ | |
596 | sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count); | |
597 | nid_begin = nid; | |
598 | pnum_begin = pnum_end; | |
599 | map_count = 1; | |
600 | } | |
601 | /* cover the last node */ | |
602 | sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count); | |
603 | vmemmap_populate_print_last(); | |
604 | } | |
605 | ||
193faea9 | 606 | #ifdef CONFIG_MEMORY_HOTPLUG |
2d070eab MH |
607 | |
608 | /* Mark all memory sections within the pfn range as online */ | |
609 | void online_mem_sections(unsigned long start_pfn, unsigned long end_pfn) | |
610 | { | |
611 | unsigned long pfn; | |
612 | ||
613 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
b4ccec41 | 614 | unsigned long section_nr = pfn_to_section_nr(pfn); |
2d070eab MH |
615 | struct mem_section *ms; |
616 | ||
617 | /* onlining code should never touch invalid ranges */ | |
618 | if (WARN_ON(!valid_section_nr(section_nr))) | |
619 | continue; | |
620 | ||
621 | ms = __nr_to_section(section_nr); | |
622 | ms->section_mem_map |= SECTION_IS_ONLINE; | |
623 | } | |
624 | } | |
625 | ||
626 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
9b7ea46a | 627 | /* Mark all memory sections within the pfn range as offline */ |
2d070eab MH |
628 | void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn) |
629 | { | |
630 | unsigned long pfn; | |
631 | ||
632 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
27227c73 | 633 | unsigned long section_nr = pfn_to_section_nr(pfn); |
2d070eab MH |
634 | struct mem_section *ms; |
635 | ||
636 | /* | |
637 | * TODO this needs some double checking. Offlining code makes | |
638 | * sure to check pfn_valid but those checks might be just bogus | |
639 | */ | |
640 | if (WARN_ON(!valid_section_nr(section_nr))) | |
641 | continue; | |
642 | ||
643 | ms = __nr_to_section(section_nr); | |
644 | ms->section_mem_map &= ~SECTION_IS_ONLINE; | |
645 | } | |
646 | } | |
647 | #endif | |
648 | ||
98f3cfc1 | 649 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
e9c0a3f0 DW |
650 | static struct page *populate_section_memmap(unsigned long pfn, |
651 | unsigned long nr_pages, int nid, struct vmem_altmap *altmap) | |
98f3cfc1 | 652 | { |
e9c0a3f0 | 653 | return __populate_section_memmap(pfn, nr_pages, nid, altmap); |
98f3cfc1 | 654 | } |
e9c0a3f0 DW |
655 | |
656 | static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages, | |
24b6d416 | 657 | struct vmem_altmap *altmap) |
98f3cfc1 | 658 | { |
e9c0a3f0 DW |
659 | unsigned long start = (unsigned long) pfn_to_page(pfn); |
660 | unsigned long end = start + nr_pages * sizeof(struct page); | |
0aad818b | 661 | |
24b6d416 | 662 | vmemmap_free(start, end, altmap); |
98f3cfc1 | 663 | } |
81556b02 | 664 | static void free_map_bootmem(struct page *memmap) |
0c0a4a51 | 665 | { |
0aad818b | 666 | unsigned long start = (unsigned long)memmap; |
81556b02 | 667 | unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION); |
0aad818b | 668 | |
24b6d416 | 669 | vmemmap_free(start, end, NULL); |
0c0a4a51 | 670 | } |
98f3cfc1 | 671 | #else |
e9c0a3f0 DW |
672 | struct page *populate_section_memmap(unsigned long pfn, |
673 | unsigned long nr_pages, int nid, struct vmem_altmap *altmap) | |
0b0acbec DH |
674 | { |
675 | struct page *page, *ret; | |
85b35fea | 676 | unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION; |
0b0acbec | 677 | |
f2d0aa5b | 678 | page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size)); |
0b0acbec DH |
679 | if (page) |
680 | goto got_map_page; | |
681 | ||
682 | ret = vmalloc(memmap_size); | |
683 | if (ret) | |
684 | goto got_map_ptr; | |
685 | ||
686 | return NULL; | |
687 | got_map_page: | |
688 | ret = (struct page *)pfn_to_kaddr(page_to_pfn(page)); | |
689 | got_map_ptr: | |
0b0acbec DH |
690 | |
691 | return ret; | |
692 | } | |
693 | ||
e9c0a3f0 | 694 | static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages, |
7b73d978 | 695 | struct vmem_altmap *altmap) |
98f3cfc1 | 696 | { |
e9c0a3f0 | 697 | struct page *memmap = pfn_to_page(pfn); |
98f3cfc1 | 698 | |
9e2779fa | 699 | if (is_vmalloc_addr(memmap)) |
0b0acbec DH |
700 | vfree(memmap); |
701 | else | |
702 | free_pages((unsigned long)memmap, | |
85b35fea | 703 | get_order(sizeof(struct page) * PAGES_PER_SECTION)); |
0b0acbec | 704 | } |
0c0a4a51 | 705 | |
81556b02 | 706 | static void free_map_bootmem(struct page *memmap) |
0c0a4a51 YG |
707 | { |
708 | unsigned long maps_section_nr, removing_section_nr, i; | |
81556b02 | 709 | unsigned long magic, nr_pages; |
ae64ffca | 710 | struct page *page = virt_to_page(memmap); |
0c0a4a51 | 711 | |
81556b02 ZY |
712 | nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page)) |
713 | >> PAGE_SHIFT; | |
714 | ||
0c0a4a51 | 715 | for (i = 0; i < nr_pages; i++, page++) { |
ddffe98d | 716 | magic = (unsigned long) page->freelist; |
0c0a4a51 YG |
717 | |
718 | BUG_ON(magic == NODE_INFO); | |
719 | ||
720 | maps_section_nr = pfn_to_section_nr(page_to_pfn(page)); | |
857e522a | 721 | removing_section_nr = page_private(page); |
0c0a4a51 YG |
722 | |
723 | /* | |
724 | * When this function is called, the removing section is | |
725 | * logical offlined state. This means all pages are isolated | |
726 | * from page allocator. If removing section's memmap is placed | |
727 | * on the same section, it must not be freed. | |
728 | * If it is freed, page allocator may allocate it which will | |
729 | * be removed physically soon. | |
730 | */ | |
731 | if (maps_section_nr != removing_section_nr) | |
732 | put_page_bootmem(page); | |
733 | } | |
734 | } | |
98f3cfc1 | 735 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
0b0acbec | 736 | |
ba72b4c8 DW |
737 | static void section_deactivate(unsigned long pfn, unsigned long nr_pages, |
738 | struct vmem_altmap *altmap) | |
739 | { | |
740 | DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; | |
741 | DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 }; | |
742 | struct mem_section *ms = __pfn_to_section(pfn); | |
743 | bool section_is_early = early_section(ms); | |
744 | struct page *memmap = NULL; | |
745 | unsigned long *subsection_map = ms->usage | |
746 | ? &ms->usage->subsection_map[0] : NULL; | |
747 | ||
748 | subsection_mask_set(map, pfn, nr_pages); | |
749 | if (subsection_map) | |
750 | bitmap_and(tmp, map, subsection_map, SUBSECTIONS_PER_SECTION); | |
751 | ||
752 | if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION), | |
753 | "section already deactivated (%#lx + %ld)\n", | |
754 | pfn, nr_pages)) | |
755 | return; | |
756 | ||
757 | /* | |
758 | * There are 3 cases to handle across two configurations | |
759 | * (SPARSEMEM_VMEMMAP={y,n}): | |
760 | * | |
761 | * 1/ deactivation of a partial hot-added section (only possible | |
762 | * in the SPARSEMEM_VMEMMAP=y case). | |
763 | * a/ section was present at memory init | |
764 | * b/ section was hot-added post memory init | |
765 | * 2/ deactivation of a complete hot-added section | |
766 | * 3/ deactivation of a complete section from memory init | |
767 | * | |
768 | * For 1/, when subsection_map does not empty we will not be | |
769 | * freeing the usage map, but still need to free the vmemmap | |
770 | * range. | |
771 | * | |
772 | * For 2/ and 3/ the SPARSEMEM_VMEMMAP={y,n} cases are unified | |
773 | */ | |
774 | bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION); | |
775 | if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION)) { | |
776 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
777 | ||
778 | if (!section_is_early) { | |
779 | kfree(ms->usage); | |
780 | ms->usage = NULL; | |
781 | } | |
782 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
783 | ms->section_mem_map = sparse_encode_mem_map(NULL, section_nr); | |
784 | } | |
785 | ||
786 | if (section_is_early && memmap) | |
787 | free_map_bootmem(memmap); | |
788 | else | |
789 | depopulate_section_memmap(pfn, nr_pages, altmap); | |
790 | } | |
791 | ||
792 | static struct page * __meminit section_activate(int nid, unsigned long pfn, | |
793 | unsigned long nr_pages, struct vmem_altmap *altmap) | |
794 | { | |
795 | DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; | |
796 | struct mem_section *ms = __pfn_to_section(pfn); | |
797 | struct mem_section_usage *usage = NULL; | |
798 | unsigned long *subsection_map; | |
799 | struct page *memmap; | |
800 | int rc = 0; | |
801 | ||
802 | subsection_mask_set(map, pfn, nr_pages); | |
803 | ||
804 | if (!ms->usage) { | |
805 | usage = kzalloc(mem_section_usage_size(), GFP_KERNEL); | |
806 | if (!usage) | |
807 | return ERR_PTR(-ENOMEM); | |
808 | ms->usage = usage; | |
809 | } | |
810 | subsection_map = &ms->usage->subsection_map[0]; | |
811 | ||
812 | if (bitmap_empty(map, SUBSECTIONS_PER_SECTION)) | |
813 | rc = -EINVAL; | |
814 | else if (bitmap_intersects(map, subsection_map, SUBSECTIONS_PER_SECTION)) | |
815 | rc = -EEXIST; | |
816 | else | |
817 | bitmap_or(subsection_map, map, subsection_map, | |
818 | SUBSECTIONS_PER_SECTION); | |
819 | ||
820 | if (rc) { | |
821 | if (usage) | |
822 | ms->usage = NULL; | |
823 | kfree(usage); | |
824 | return ERR_PTR(rc); | |
825 | } | |
826 | ||
827 | /* | |
828 | * The early init code does not consider partially populated | |
829 | * initial sections, it simply assumes that memory will never be | |
830 | * referenced. If we hot-add memory into such a section then we | |
831 | * do not need to populate the memmap and can simply reuse what | |
832 | * is already there. | |
833 | */ | |
834 | if (nr_pages < PAGES_PER_SECTION && early_section(ms)) | |
835 | return pfn_to_page(pfn); | |
836 | ||
837 | memmap = populate_section_memmap(pfn, nr_pages, nid, altmap); | |
838 | if (!memmap) { | |
839 | section_deactivate(pfn, nr_pages, altmap); | |
840 | return ERR_PTR(-ENOMEM); | |
841 | } | |
842 | ||
843 | return memmap; | |
844 | } | |
845 | ||
7567cfc5 | 846 | /** |
ba72b4c8 | 847 | * sparse_add_section - add a memory section, or populate an existing one |
7567cfc5 BH |
848 | * @nid: The node to add section on |
849 | * @start_pfn: start pfn of the memory range | |
ba72b4c8 | 850 | * @nr_pages: number of pfns to add in the section |
7567cfc5 BH |
851 | * @altmap: device page map |
852 | * | |
853 | * This is only intended for hotplug. | |
854 | * | |
855 | * Return: | |
856 | * * 0 - On success. | |
857 | * * -EEXIST - Section has been present. | |
858 | * * -ENOMEM - Out of memory. | |
29751f69 | 859 | */ |
7ea62160 DW |
860 | int __meminit sparse_add_section(int nid, unsigned long start_pfn, |
861 | unsigned long nr_pages, struct vmem_altmap *altmap) | |
29751f69 | 862 | { |
0b0acbec | 863 | unsigned long section_nr = pfn_to_section_nr(start_pfn); |
0b0acbec DH |
864 | struct mem_section *ms; |
865 | struct page *memmap; | |
0b0acbec | 866 | int ret; |
29751f69 | 867 | |
4e0d2e7e | 868 | ret = sparse_index_init(section_nr, nid); |
ba72b4c8 | 869 | if (ret < 0) |
bbd06825 | 870 | return ret; |
0b0acbec | 871 | |
ba72b4c8 DW |
872 | memmap = section_activate(nid, start_pfn, nr_pages, altmap); |
873 | if (IS_ERR(memmap)) | |
874 | return PTR_ERR(memmap); | |
5c0e3066 | 875 | |
d0dc12e8 PT |
876 | /* |
877 | * Poison uninitialized struct pages in order to catch invalid flags | |
878 | * combinations. | |
879 | */ | |
ba72b4c8 | 880 | page_init_poison(pfn_to_page(start_pfn), sizeof(struct page) * nr_pages); |
3ac19f8e | 881 | |
c1cbc3ee | 882 | ms = __nr_to_section(section_nr); |
26f26bed | 883 | set_section_nid(section_nr, nid); |
c4e1be9e | 884 | section_mark_present(ms); |
0b0acbec | 885 | |
ba72b4c8 DW |
886 | /* Align memmap to section boundary in the subsection case */ |
887 | if (section_nr_to_pfn(section_nr) != start_pfn) | |
888 | memmap = pfn_to_kaddr(section_nr_to_pfn(section_nr)); | |
889 | sparse_init_one_section(ms, section_nr, memmap, ms->usage, 0); | |
890 | ||
891 | return 0; | |
29751f69 | 892 | } |
ea01ea93 | 893 | |
95a4774d WC |
894 | #ifdef CONFIG_MEMORY_FAILURE |
895 | static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages) | |
896 | { | |
897 | int i; | |
898 | ||
5eb570a8 BS |
899 | /* |
900 | * A further optimization is to have per section refcounted | |
901 | * num_poisoned_pages. But that would need more space per memmap, so | |
902 | * for now just do a quick global check to speed up this routine in the | |
903 | * absence of bad pages. | |
904 | */ | |
905 | if (atomic_long_read(&num_poisoned_pages) == 0) | |
906 | return; | |
907 | ||
4b94ffdc | 908 | for (i = 0; i < nr_pages; i++) { |
95a4774d | 909 | if (PageHWPoison(&memmap[i])) { |
9f82883c | 910 | num_poisoned_pages_dec(); |
95a4774d WC |
911 | ClearPageHWPoison(&memmap[i]); |
912 | } | |
913 | } | |
914 | } | |
915 | #else | |
916 | static inline void clear_hwpoisoned_pages(struct page *memmap, int nr_pages) | |
917 | { | |
918 | } | |
919 | #endif | |
920 | ||
ba72b4c8 | 921 | void sparse_remove_section(struct mem_section *ms, unsigned long pfn, |
7ea62160 DW |
922 | unsigned long nr_pages, unsigned long map_offset, |
923 | struct vmem_altmap *altmap) | |
ea01ea93 | 924 | { |
ba72b4c8 DW |
925 | clear_hwpoisoned_pages(pfn_to_page(pfn) + map_offset, |
926 | nr_pages - map_offset); | |
927 | section_deactivate(pfn, nr_pages, altmap); | |
ea01ea93 | 928 | } |
4edd7cef | 929 | #endif /* CONFIG_MEMORY_HOTPLUG */ |