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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3947be19 DH |
2 | /* |
3 | * linux/mm/memory_hotplug.c | |
4 | * | |
5 | * Copyright (C) | |
6 | */ | |
7 | ||
3947be19 DH |
8 | #include <linux/stddef.h> |
9 | #include <linux/mm.h> | |
174cd4b1 | 10 | #include <linux/sched/signal.h> |
3947be19 DH |
11 | #include <linux/swap.h> |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/pagemap.h> | |
3947be19 | 14 | #include <linux/compiler.h> |
b95f1b31 | 15 | #include <linux/export.h> |
3947be19 | 16 | #include <linux/pagevec.h> |
2d1d43f6 | 17 | #include <linux/writeback.h> |
3947be19 DH |
18 | #include <linux/slab.h> |
19 | #include <linux/sysctl.h> | |
20 | #include <linux/cpu.h> | |
21 | #include <linux/memory.h> | |
4b94ffdc | 22 | #include <linux/memremap.h> |
3947be19 | 23 | #include <linux/memory_hotplug.h> |
3947be19 | 24 | #include <linux/vmalloc.h> |
0a547039 | 25 | #include <linux/ioport.h> |
0c0e6195 KH |
26 | #include <linux/delay.h> |
27 | #include <linux/migrate.h> | |
28 | #include <linux/page-isolation.h> | |
71088785 | 29 | #include <linux/pfn.h> |
6ad696d2 | 30 | #include <linux/suspend.h> |
6d9c285a | 31 | #include <linux/mm_inline.h> |
d96ae530 | 32 | #include <linux/firmware-map.h> |
60a5a19e | 33 | #include <linux/stop_machine.h> |
c8721bbb | 34 | #include <linux/hugetlb.h> |
c5320926 | 35 | #include <linux/memblock.h> |
698b1b30 | 36 | #include <linux/compaction.h> |
b15c8726 | 37 | #include <linux/rmap.h> |
8581fd40 | 38 | #include <linux/module.h> |
3947be19 DH |
39 | |
40 | #include <asm/tlbflush.h> | |
41 | ||
1e5ad9a3 | 42 | #include "internal.h" |
e900a918 | 43 | #include "shuffle.h" |
1e5ad9a3 | 44 | |
6e02c46b | 45 | #ifdef CONFIG_MHP_MEMMAP_ON_MEMORY |
e3a9d9fc OS |
46 | /* |
47 | * memory_hotplug.memmap_on_memory parameter | |
48 | */ | |
49 | static bool memmap_on_memory __ro_after_init; | |
66361095 | 50 | module_param(memmap_on_memory, bool, 0444); |
e3a9d9fc | 51 | MODULE_PARM_DESC(memmap_on_memory, "Enable memmap on memory for memory hotplug"); |
6e02c46b | 52 | |
66361095 | 53 | static inline bool mhp_memmap_on_memory(void) |
6e02c46b MS |
54 | { |
55 | return memmap_on_memory; | |
56 | } | |
66361095 MS |
57 | #else |
58 | static inline bool mhp_memmap_on_memory(void) | |
59 | { | |
60 | return false; | |
61 | } | |
e3a9d9fc | 62 | #endif |
a08a2ae3 | 63 | |
e83a437f DH |
64 | enum { |
65 | ONLINE_POLICY_CONTIG_ZONES = 0, | |
66 | ONLINE_POLICY_AUTO_MOVABLE, | |
67 | }; | |
68 | ||
ac62554b | 69 | static const char * const online_policy_to_str[] = { |
e83a437f DH |
70 | [ONLINE_POLICY_CONTIG_ZONES] = "contig-zones", |
71 | [ONLINE_POLICY_AUTO_MOVABLE] = "auto-movable", | |
72 | }; | |
73 | ||
74 | static int set_online_policy(const char *val, const struct kernel_param *kp) | |
75 | { | |
76 | int ret = sysfs_match_string(online_policy_to_str, val); | |
77 | ||
78 | if (ret < 0) | |
79 | return ret; | |
80 | *((int *)kp->arg) = ret; | |
81 | return 0; | |
82 | } | |
83 | ||
84 | static int get_online_policy(char *buffer, const struct kernel_param *kp) | |
85 | { | |
86 | return sprintf(buffer, "%s\n", online_policy_to_str[*((int *)kp->arg)]); | |
87 | } | |
88 | ||
89 | /* | |
90 | * memory_hotplug.online_policy: configure online behavior when onlining without | |
91 | * specifying a zone (MMOP_ONLINE) | |
92 | * | |
93 | * "contig-zones": keep zone contiguous | |
94 | * "auto-movable": online memory to ZONE_MOVABLE if the configuration | |
95 | * (auto_movable_ratio, auto_movable_numa_aware) allows for it | |
96 | */ | |
97 | static int online_policy __read_mostly = ONLINE_POLICY_CONTIG_ZONES; | |
98 | static const struct kernel_param_ops online_policy_ops = { | |
99 | .set = set_online_policy, | |
100 | .get = get_online_policy, | |
101 | }; | |
102 | module_param_cb(online_policy, &online_policy_ops, &online_policy, 0644); | |
103 | MODULE_PARM_DESC(online_policy, | |
104 | "Set the online policy (\"contig-zones\", \"auto-movable\") " | |
105 | "Default: \"contig-zones\""); | |
106 | ||
107 | /* | |
108 | * memory_hotplug.auto_movable_ratio: specify maximum MOVABLE:KERNEL ratio | |
109 | * | |
110 | * The ratio represent an upper limit and the kernel might decide to not | |
111 | * online some memory to ZONE_MOVABLE -- e.g., because hotplugged KERNEL memory | |
112 | * doesn't allow for more MOVABLE memory. | |
113 | */ | |
114 | static unsigned int auto_movable_ratio __read_mostly = 301; | |
115 | module_param(auto_movable_ratio, uint, 0644); | |
116 | MODULE_PARM_DESC(auto_movable_ratio, | |
117 | "Set the maximum ratio of MOVABLE:KERNEL memory in the system " | |
118 | "in percent for \"auto-movable\" online policy. Default: 301"); | |
119 | ||
120 | /* | |
121 | * memory_hotplug.auto_movable_numa_aware: consider numa node stats | |
122 | */ | |
123 | #ifdef CONFIG_NUMA | |
124 | static bool auto_movable_numa_aware __read_mostly = true; | |
125 | module_param(auto_movable_numa_aware, bool, 0644); | |
126 | MODULE_PARM_DESC(auto_movable_numa_aware, | |
127 | "Consider numa node stats in addition to global stats in " | |
128 | "\"auto-movable\" online policy. Default: true"); | |
129 | #endif /* CONFIG_NUMA */ | |
130 | ||
9d0ad8ca DK |
131 | /* |
132 | * online_page_callback contains pointer to current page onlining function. | |
133 | * Initially it is generic_online_page(). If it is required it could be | |
134 | * changed by calling set_online_page_callback() for callback registration | |
135 | * and restore_online_page_callback() for generic callback restore. | |
136 | */ | |
137 | ||
9d0ad8ca | 138 | static online_page_callback_t online_page_callback = generic_online_page; |
bfc8c901 | 139 | static DEFINE_MUTEX(online_page_callback_lock); |
9d0ad8ca | 140 | |
3f906ba2 | 141 | DEFINE_STATIC_PERCPU_RWSEM(mem_hotplug_lock); |
bfc8c901 | 142 | |
3f906ba2 TG |
143 | void get_online_mems(void) |
144 | { | |
145 | percpu_down_read(&mem_hotplug_lock); | |
146 | } | |
bfc8c901 | 147 | |
3f906ba2 TG |
148 | void put_online_mems(void) |
149 | { | |
150 | percpu_up_read(&mem_hotplug_lock); | |
151 | } | |
bfc8c901 | 152 | |
4932381e MH |
153 | bool movable_node_enabled = false; |
154 | ||
8604d9e5 | 155 | #ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE |
1adf8b46 | 156 | int mhp_default_online_type = MMOP_OFFLINE; |
8604d9e5 | 157 | #else |
1adf8b46 | 158 | int mhp_default_online_type = MMOP_ONLINE; |
8604d9e5 | 159 | #endif |
31bc3858 | 160 | |
86dd995d VK |
161 | static int __init setup_memhp_default_state(char *str) |
162 | { | |
1adf8b46 | 163 | const int online_type = mhp_online_type_from_str(str); |
5f47adf7 DH |
164 | |
165 | if (online_type >= 0) | |
1adf8b46 | 166 | mhp_default_online_type = online_type; |
86dd995d VK |
167 | |
168 | return 1; | |
169 | } | |
170 | __setup("memhp_default_state=", setup_memhp_default_state); | |
171 | ||
30467e0b | 172 | void mem_hotplug_begin(void) |
20d6c96b | 173 | { |
3f906ba2 TG |
174 | cpus_read_lock(); |
175 | percpu_down_write(&mem_hotplug_lock); | |
20d6c96b KM |
176 | } |
177 | ||
30467e0b | 178 | void mem_hotplug_done(void) |
bfc8c901 | 179 | { |
3f906ba2 TG |
180 | percpu_up_write(&mem_hotplug_lock); |
181 | cpus_read_unlock(); | |
bfc8c901 | 182 | } |
20d6c96b | 183 | |
357b4da5 JG |
184 | u64 max_mem_size = U64_MAX; |
185 | ||
45e0b78b | 186 | /* add this memory to iomem resource */ |
7b7b2721 DH |
187 | static struct resource *register_memory_resource(u64 start, u64 size, |
188 | const char *resource_name) | |
45e0b78b | 189 | { |
2794129e DH |
190 | struct resource *res; |
191 | unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; | |
7b7b2721 DH |
192 | |
193 | if (strcmp(resource_name, "System RAM")) | |
7cf603d1 | 194 | flags |= IORESOURCE_SYSRAM_DRIVER_MANAGED; |
357b4da5 | 195 | |
bca3feaa AK |
196 | if (!mhp_range_allowed(start, size, true)) |
197 | return ERR_PTR(-E2BIG); | |
198 | ||
f3cd4c86 BH |
199 | /* |
200 | * Make sure value parsed from 'mem=' only restricts memory adding | |
201 | * while booting, so that memory hotplug won't be impacted. Please | |
202 | * refer to document of 'mem=' in kernel-parameters.txt for more | |
203 | * details. | |
204 | */ | |
205 | if (start + size > max_mem_size && system_state < SYSTEM_RUNNING) | |
357b4da5 JG |
206 | return ERR_PTR(-E2BIG); |
207 | ||
2794129e DH |
208 | /* |
209 | * Request ownership of the new memory range. This might be | |
210 | * a child of an existing resource that was present but | |
211 | * not marked as busy. | |
212 | */ | |
213 | res = __request_region(&iomem_resource, start, size, | |
214 | resource_name, flags); | |
215 | ||
216 | if (!res) { | |
217 | pr_debug("Unable to reserve System RAM region: %016llx->%016llx\n", | |
218 | start, start + size); | |
6f754ba4 | 219 | return ERR_PTR(-EEXIST); |
45e0b78b KM |
220 | } |
221 | return res; | |
222 | } | |
223 | ||
224 | static void release_memory_resource(struct resource *res) | |
225 | { | |
226 | if (!res) | |
227 | return; | |
228 | release_resource(res); | |
229 | kfree(res); | |
45e0b78b KM |
230 | } |
231 | ||
943189db | 232 | static int check_pfn_span(unsigned long pfn, unsigned long nr_pages) |
7ea62160 DW |
233 | { |
234 | /* | |
235 | * Disallow all operations smaller than a sub-section and only | |
236 | * allow operations smaller than a section for | |
237 | * SPARSEMEM_VMEMMAP. Note that check_hotplug_memory_range() | |
238 | * enforces a larger memory_block_size_bytes() granularity for | |
239 | * memory that will be marked online, so this check should only | |
240 | * fire for direct arch_{add,remove}_memory() users outside of | |
241 | * add_memory_resource(). | |
242 | */ | |
243 | unsigned long min_align; | |
244 | ||
245 | if (IS_ENABLED(CONFIG_SPARSEMEM_VMEMMAP)) | |
246 | min_align = PAGES_PER_SUBSECTION; | |
247 | else | |
248 | min_align = PAGES_PER_SECTION; | |
943189db | 249 | if (!IS_ALIGNED(pfn | nr_pages, min_align)) |
7ea62160 | 250 | return -EINVAL; |
7ea62160 DW |
251 | return 0; |
252 | } | |
253 | ||
9f605f26 DW |
254 | /* |
255 | * Return page for the valid pfn only if the page is online. All pfn | |
256 | * walkers which rely on the fully initialized page->flags and others | |
257 | * should use this rather than pfn_valid && pfn_to_page | |
258 | */ | |
259 | struct page *pfn_to_online_page(unsigned long pfn) | |
260 | { | |
261 | unsigned long nr = pfn_to_section_nr(pfn); | |
1f90a347 | 262 | struct dev_pagemap *pgmap; |
9f9b02e5 DW |
263 | struct mem_section *ms; |
264 | ||
265 | if (nr >= NR_MEM_SECTIONS) | |
266 | return NULL; | |
267 | ||
268 | ms = __nr_to_section(nr); | |
269 | if (!online_section(ms)) | |
270 | return NULL; | |
271 | ||
272 | /* | |
273 | * Save some code text when online_section() + | |
274 | * pfn_section_valid() are sufficient. | |
275 | */ | |
276 | if (IS_ENABLED(CONFIG_HAVE_ARCH_PFN_VALID) && !pfn_valid(pfn)) | |
277 | return NULL; | |
278 | ||
279 | if (!pfn_section_valid(ms, pfn)) | |
280 | return NULL; | |
9f605f26 | 281 | |
1f90a347 DW |
282 | if (!online_device_section(ms)) |
283 | return pfn_to_page(pfn); | |
284 | ||
285 | /* | |
286 | * Slowpath: when ZONE_DEVICE collides with | |
287 | * ZONE_{NORMAL,MOVABLE} within the same section some pfns in | |
288 | * the section may be 'offline' but 'valid'. Only | |
289 | * get_dev_pagemap() can determine sub-section online status. | |
290 | */ | |
291 | pgmap = get_dev_pagemap(pfn, NULL); | |
292 | put_dev_pagemap(pgmap); | |
293 | ||
294 | /* The presence of a pgmap indicates ZONE_DEVICE offline pfn */ | |
295 | if (pgmap) | |
296 | return NULL; | |
297 | ||
9f9b02e5 | 298 | return pfn_to_page(pfn); |
9f605f26 DW |
299 | } |
300 | EXPORT_SYMBOL_GPL(pfn_to_online_page); | |
301 | ||
7ea62160 | 302 | int __ref __add_pages(int nid, unsigned long pfn, unsigned long nr_pages, |
f5637d3b | 303 | struct mhp_params *params) |
4edd7cef | 304 | { |
6cdd0b30 DH |
305 | const unsigned long end_pfn = pfn + nr_pages; |
306 | unsigned long cur_nr_pages; | |
9a845030 | 307 | int err; |
f5637d3b | 308 | struct vmem_altmap *altmap = params->altmap; |
4b94ffdc | 309 | |
6366238b | 310 | if (WARN_ON_ONCE(!pgprot_val(params->pgprot))) |
bfeb022f LG |
311 | return -EINVAL; |
312 | ||
bca3feaa | 313 | VM_BUG_ON(!mhp_range_allowed(PFN_PHYS(pfn), nr_pages * PAGE_SIZE, false)); |
dca4436d | 314 | |
4b94ffdc DW |
315 | if (altmap) { |
316 | /* | |
317 | * Validate altmap is within bounds of the total request | |
318 | */ | |
7ea62160 | 319 | if (altmap->base_pfn != pfn |
4b94ffdc DW |
320 | || vmem_altmap_offset(altmap) > nr_pages) { |
321 | pr_warn_once("memory add fail, invalid altmap\n"); | |
7ea62160 | 322 | return -EINVAL; |
4b94ffdc DW |
323 | } |
324 | altmap->alloc = 0; | |
325 | } | |
326 | ||
943189db AK |
327 | if (check_pfn_span(pfn, nr_pages)) { |
328 | WARN(1, "Misaligned %s start: %#lx end: #%lx\n", __func__, pfn, pfn + nr_pages - 1); | |
329 | return -EINVAL; | |
330 | } | |
7ea62160 | 331 | |
6cdd0b30 DH |
332 | for (; pfn < end_pfn; pfn += cur_nr_pages) { |
333 | /* Select all remaining pages up to the next section boundary */ | |
334 | cur_nr_pages = min(end_pfn - pfn, | |
335 | SECTION_ALIGN_UP(pfn + 1) - pfn); | |
e3246d8f JM |
336 | err = sparse_add_section(nid, pfn, cur_nr_pages, altmap, |
337 | params->pgmap); | |
ba72b4c8 DW |
338 | if (err) |
339 | break; | |
f64ac5e6 | 340 | cond_resched(); |
4edd7cef | 341 | } |
c435a390 | 342 | vmemmap_populate_print_last(); |
4edd7cef DR |
343 | return err; |
344 | } | |
4edd7cef | 345 | |
815121d2 | 346 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
d09b0137 | 347 | static unsigned long find_smallest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
348 | unsigned long start_pfn, |
349 | unsigned long end_pfn) | |
350 | { | |
49ba3c6b | 351 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SUBSECTION) { |
7ce700bf | 352 | if (unlikely(!pfn_to_online_page(start_pfn))) |
815121d2 YI |
353 | continue; |
354 | ||
355 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
356 | continue; | |
357 | ||
9b05158f | 358 | if (zone != page_zone(pfn_to_page(start_pfn))) |
815121d2 YI |
359 | continue; |
360 | ||
361 | return start_pfn; | |
362 | } | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
d09b0137 | 368 | static unsigned long find_biggest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
369 | unsigned long start_pfn, |
370 | unsigned long end_pfn) | |
371 | { | |
815121d2 YI |
372 | unsigned long pfn; |
373 | ||
374 | /* pfn is the end pfn of a memory section. */ | |
375 | pfn = end_pfn - 1; | |
49ba3c6b | 376 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SUBSECTION) { |
7ce700bf | 377 | if (unlikely(!pfn_to_online_page(pfn))) |
815121d2 YI |
378 | continue; |
379 | ||
380 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
381 | continue; | |
382 | ||
9b05158f | 383 | if (zone != page_zone(pfn_to_page(pfn))) |
815121d2 YI |
384 | continue; |
385 | ||
386 | return pfn; | |
387 | } | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
393 | unsigned long end_pfn) | |
394 | { | |
815121d2 | 395 | unsigned long pfn; |
815121d2 YI |
396 | int nid = zone_to_nid(zone); |
397 | ||
5d12071c | 398 | if (zone->zone_start_pfn == start_pfn) { |
815121d2 YI |
399 | /* |
400 | * If the section is smallest section in the zone, it need | |
401 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
402 | * In this case, we find second smallest valid mem_section | |
403 | * for shrinking zone. | |
404 | */ | |
405 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
5d12071c | 406 | zone_end_pfn(zone)); |
815121d2 | 407 | if (pfn) { |
5d12071c | 408 | zone->spanned_pages = zone_end_pfn(zone) - pfn; |
815121d2 | 409 | zone->zone_start_pfn = pfn; |
950b68d9 DH |
410 | } else { |
411 | zone->zone_start_pfn = 0; | |
412 | zone->spanned_pages = 0; | |
815121d2 | 413 | } |
5d12071c | 414 | } else if (zone_end_pfn(zone) == end_pfn) { |
815121d2 YI |
415 | /* |
416 | * If the section is biggest section in the zone, it need | |
417 | * shrink zone->spanned_pages. | |
418 | * In this case, we find second biggest valid mem_section for | |
419 | * shrinking zone. | |
420 | */ | |
5d12071c | 421 | pfn = find_biggest_section_pfn(nid, zone, zone->zone_start_pfn, |
815121d2 YI |
422 | start_pfn); |
423 | if (pfn) | |
5d12071c | 424 | zone->spanned_pages = pfn - zone->zone_start_pfn + 1; |
950b68d9 DH |
425 | else { |
426 | zone->zone_start_pfn = 0; | |
427 | zone->spanned_pages = 0; | |
428 | } | |
815121d2 | 429 | } |
815121d2 YI |
430 | } |
431 | ||
00d6c019 | 432 | static void update_pgdat_span(struct pglist_data *pgdat) |
815121d2 | 433 | { |
00d6c019 DH |
434 | unsigned long node_start_pfn = 0, node_end_pfn = 0; |
435 | struct zone *zone; | |
436 | ||
437 | for (zone = pgdat->node_zones; | |
438 | zone < pgdat->node_zones + MAX_NR_ZONES; zone++) { | |
6c922cf7 | 439 | unsigned long end_pfn = zone_end_pfn(zone); |
00d6c019 DH |
440 | |
441 | /* No need to lock the zones, they can't change. */ | |
656d5711 DH |
442 | if (!zone->spanned_pages) |
443 | continue; | |
444 | if (!node_end_pfn) { | |
445 | node_start_pfn = zone->zone_start_pfn; | |
6c922cf7 | 446 | node_end_pfn = end_pfn; |
656d5711 DH |
447 | continue; |
448 | } | |
449 | ||
6c922cf7 ML |
450 | if (end_pfn > node_end_pfn) |
451 | node_end_pfn = end_pfn; | |
00d6c019 DH |
452 | if (zone->zone_start_pfn < node_start_pfn) |
453 | node_start_pfn = zone->zone_start_pfn; | |
815121d2 YI |
454 | } |
455 | ||
00d6c019 DH |
456 | pgdat->node_start_pfn = node_start_pfn; |
457 | pgdat->node_spanned_pages = node_end_pfn - node_start_pfn; | |
815121d2 YI |
458 | } |
459 | ||
feee6b29 DH |
460 | void __ref remove_pfn_range_from_zone(struct zone *zone, |
461 | unsigned long start_pfn, | |
462 | unsigned long nr_pages) | |
815121d2 | 463 | { |
b7e3debd | 464 | const unsigned long end_pfn = start_pfn + nr_pages; |
815121d2 | 465 | struct pglist_data *pgdat = zone->zone_pgdat; |
27cacaad | 466 | unsigned long pfn, cur_nr_pages; |
815121d2 | 467 | |
d33695b1 | 468 | /* Poison struct pages because they are now uninitialized again. */ |
b7e3debd BW |
469 | for (pfn = start_pfn; pfn < end_pfn; pfn += cur_nr_pages) { |
470 | cond_resched(); | |
471 | ||
472 | /* Select all remaining pages up to the next section boundary */ | |
473 | cur_nr_pages = | |
474 | min(end_pfn - pfn, SECTION_ALIGN_UP(pfn + 1) - pfn); | |
475 | page_init_poison(pfn_to_page(pfn), | |
476 | sizeof(struct page) * cur_nr_pages); | |
477 | } | |
d33695b1 | 478 | |
7ce700bf DH |
479 | /* |
480 | * Zone shrinking code cannot properly deal with ZONE_DEVICE. So | |
481 | * we will not try to shrink the zones - which is okay as | |
482 | * set_zone_contiguous() cannot deal with ZONE_DEVICE either way. | |
483 | */ | |
5ef5f810 | 484 | if (zone_is_zone_device(zone)) |
7ce700bf | 485 | return; |
7ce700bf | 486 | |
feee6b29 DH |
487 | clear_zone_contiguous(zone); |
488 | ||
815121d2 | 489 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); |
00d6c019 | 490 | update_pgdat_span(pgdat); |
feee6b29 DH |
491 | |
492 | set_zone_contiguous(zone); | |
815121d2 YI |
493 | } |
494 | ||
feee6b29 DH |
495 | static void __remove_section(unsigned long pfn, unsigned long nr_pages, |
496 | unsigned long map_offset, | |
497 | struct vmem_altmap *altmap) | |
ea01ea93 | 498 | { |
10404901 | 499 | struct mem_section *ms = __pfn_to_section(pfn); |
ea01ea93 | 500 | |
9d1d887d DH |
501 | if (WARN_ON_ONCE(!valid_section(ms))) |
502 | return; | |
ea01ea93 | 503 | |
ba72b4c8 | 504 | sparse_remove_section(ms, pfn, nr_pages, map_offset, altmap); |
ea01ea93 BP |
505 | } |
506 | ||
ea01ea93 | 507 | /** |
feee6b29 | 508 | * __remove_pages() - remove sections of pages |
7ea62160 | 509 | * @pfn: starting pageframe (must be aligned to start of a section) |
ea01ea93 | 510 | * @nr_pages: number of pages to remove (must be multiple of section size) |
e8b098fc | 511 | * @altmap: alternative device page map or %NULL if default memmap is used |
ea01ea93 BP |
512 | * |
513 | * Generic helper function to remove section mappings and sysfs entries | |
514 | * for the section of the memory we are removing. Caller needs to make | |
515 | * sure that pages are marked reserved and zones are adjust properly by | |
516 | * calling offline_pages(). | |
517 | */ | |
feee6b29 DH |
518 | void __remove_pages(unsigned long pfn, unsigned long nr_pages, |
519 | struct vmem_altmap *altmap) | |
ea01ea93 | 520 | { |
52fb87c8 DH |
521 | const unsigned long end_pfn = pfn + nr_pages; |
522 | unsigned long cur_nr_pages; | |
4b94ffdc | 523 | unsigned long map_offset = 0; |
4b94ffdc | 524 | |
96da4350 | 525 | map_offset = vmem_altmap_offset(altmap); |
ea01ea93 | 526 | |
943189db AK |
527 | if (check_pfn_span(pfn, nr_pages)) { |
528 | WARN(1, "Misaligned %s start: %#lx end: #%lx\n", __func__, pfn, pfn + nr_pages - 1); | |
7ea62160 | 529 | return; |
943189db | 530 | } |
ea01ea93 | 531 | |
52fb87c8 | 532 | for (; pfn < end_pfn; pfn += cur_nr_pages) { |
dd33ad7b | 533 | cond_resched(); |
52fb87c8 | 534 | /* Select all remaining pages up to the next section boundary */ |
a11b9419 DH |
535 | cur_nr_pages = min(end_pfn - pfn, |
536 | SECTION_ALIGN_UP(pfn + 1) - pfn); | |
52fb87c8 | 537 | __remove_section(pfn, cur_nr_pages, map_offset, altmap); |
4b94ffdc | 538 | map_offset = 0; |
ea01ea93 | 539 | } |
ea01ea93 | 540 | } |
ea01ea93 | 541 | |
9d0ad8ca DK |
542 | int set_online_page_callback(online_page_callback_t callback) |
543 | { | |
544 | int rc = -EINVAL; | |
545 | ||
bfc8c901 VD |
546 | get_online_mems(); |
547 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
548 | |
549 | if (online_page_callback == generic_online_page) { | |
550 | online_page_callback = callback; | |
551 | rc = 0; | |
552 | } | |
553 | ||
bfc8c901 VD |
554 | mutex_unlock(&online_page_callback_lock); |
555 | put_online_mems(); | |
9d0ad8ca DK |
556 | |
557 | return rc; | |
558 | } | |
559 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
560 | ||
561 | int restore_online_page_callback(online_page_callback_t callback) | |
562 | { | |
563 | int rc = -EINVAL; | |
564 | ||
bfc8c901 VD |
565 | get_online_mems(); |
566 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
567 | |
568 | if (online_page_callback == callback) { | |
569 | online_page_callback = generic_online_page; | |
570 | rc = 0; | |
571 | } | |
572 | ||
bfc8c901 VD |
573 | mutex_unlock(&online_page_callback_lock); |
574 | put_online_mems(); | |
9d0ad8ca DK |
575 | |
576 | return rc; | |
577 | } | |
578 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
579 | ||
18db1491 | 580 | void generic_online_page(struct page *page, unsigned int order) |
9d0ad8ca | 581 | { |
c87cbc1f VB |
582 | /* |
583 | * Freeing the page with debug_pagealloc enabled will try to unmap it, | |
584 | * so we should map it first. This is better than introducing a special | |
585 | * case in page freeing fast path. | |
586 | */ | |
77bc7fd6 | 587 | debug_pagealloc_map_pages(page, 1 << order); |
a9cd410a AK |
588 | __free_pages_core(page, order); |
589 | totalram_pages_add(1UL << order); | |
a9cd410a | 590 | } |
18db1491 | 591 | EXPORT_SYMBOL_GPL(generic_online_page); |
a9cd410a | 592 | |
aac65321 | 593 | static void online_pages_range(unsigned long start_pfn, unsigned long nr_pages) |
3947be19 | 594 | { |
b2c2ab20 DH |
595 | const unsigned long end_pfn = start_pfn + nr_pages; |
596 | unsigned long pfn; | |
b2c2ab20 DH |
597 | |
598 | /* | |
aac65321 DH |
599 | * Online the pages in MAX_ORDER - 1 aligned chunks. The callback might |
600 | * decide to not expose all pages to the buddy (e.g., expose them | |
601 | * later). We account all pages as being online and belonging to this | |
602 | * zone ("present"). | |
a08a2ae3 OS |
603 | * When using memmap_on_memory, the range might not be aligned to |
604 | * MAX_ORDER_NR_PAGES - 1, but pageblock aligned. __ffs() will detect | |
605 | * this and the first chunk to online will be pageblock_nr_pages. | |
b2c2ab20 | 606 | */ |
a08a2ae3 OS |
607 | for (pfn = start_pfn; pfn < end_pfn;) { |
608 | int order = min(MAX_ORDER - 1UL, __ffs(pfn)); | |
609 | ||
610 | (*online_page_callback)(pfn_to_page(pfn), order); | |
611 | pfn += (1UL << order); | |
612 | } | |
2d070eab | 613 | |
b2c2ab20 DH |
614 | /* mark all involved sections as online */ |
615 | online_mem_sections(start_pfn, end_pfn); | |
75884fb1 KH |
616 | } |
617 | ||
d9713679 LJ |
618 | /* check which state of node_states will be changed when online memory */ |
619 | static void node_states_check_changes_online(unsigned long nr_pages, | |
620 | struct zone *zone, struct memory_notify *arg) | |
621 | { | |
622 | int nid = zone_to_nid(zone); | |
d9713679 | 623 | |
98fa15f3 AK |
624 | arg->status_change_nid = NUMA_NO_NODE; |
625 | arg->status_change_nid_normal = NUMA_NO_NODE; | |
d9713679 | 626 | |
8efe33f4 OS |
627 | if (!node_state(nid, N_MEMORY)) |
628 | arg->status_change_nid = nid; | |
629 | if (zone_idx(zone) <= ZONE_NORMAL && !node_state(nid, N_NORMAL_MEMORY)) | |
d9713679 | 630 | arg->status_change_nid_normal = nid; |
d9713679 LJ |
631 | } |
632 | ||
633 | static void node_states_set_node(int node, struct memory_notify *arg) | |
634 | { | |
635 | if (arg->status_change_nid_normal >= 0) | |
636 | node_set_state(node, N_NORMAL_MEMORY); | |
637 | ||
83d83612 OS |
638 | if (arg->status_change_nid >= 0) |
639 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
640 | } |
641 | ||
f1dd2cd1 MH |
642 | static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, |
643 | unsigned long nr_pages) | |
644 | { | |
645 | unsigned long old_end_pfn = zone_end_pfn(zone); | |
646 | ||
647 | if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) | |
648 | zone->zone_start_pfn = start_pfn; | |
649 | ||
650 | zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn; | |
651 | } | |
652 | ||
653 | static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned long start_pfn, | |
654 | unsigned long nr_pages) | |
655 | { | |
656 | unsigned long old_end_pfn = pgdat_end_pfn(pgdat); | |
657 | ||
658 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) | |
659 | pgdat->node_start_pfn = start_pfn; | |
660 | ||
661 | pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn; | |
f1dd2cd1 | 662 | |
3fccb74c | 663 | } |
1f90a347 | 664 | |
ed7802dd | 665 | #ifdef CONFIG_ZONE_DEVICE |
1f90a347 DW |
666 | static void section_taint_zone_device(unsigned long pfn) |
667 | { | |
668 | struct mem_section *ms = __pfn_to_section(pfn); | |
669 | ||
670 | ms->section_mem_map |= SECTION_TAINT_ZONE_DEVICE; | |
671 | } | |
ed7802dd MS |
672 | #else |
673 | static inline void section_taint_zone_device(unsigned long pfn) | |
674 | { | |
675 | } | |
676 | #endif | |
1f90a347 | 677 | |
3fccb74c DH |
678 | /* |
679 | * Associate the pfn range with the given zone, initializing the memmaps | |
680 | * and resizing the pgdat/zone data to span the added pages. After this | |
681 | * call, all affected pages are PG_reserved. | |
d882c006 DH |
682 | * |
683 | * All aligned pageblocks are initialized to the specified migratetype | |
684 | * (usually MIGRATE_MOVABLE). Besides setting the migratetype, no related | |
685 | * zone stats (e.g., nr_isolate_pageblock) are touched. | |
3fccb74c | 686 | */ |
a99583e7 | 687 | void __ref move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, |
d882c006 DH |
688 | unsigned long nr_pages, |
689 | struct vmem_altmap *altmap, int migratetype) | |
f1dd2cd1 MH |
690 | { |
691 | struct pglist_data *pgdat = zone->zone_pgdat; | |
692 | int nid = pgdat->node_id; | |
df429ac0 | 693 | |
f1dd2cd1 MH |
694 | clear_zone_contiguous(zone); |
695 | ||
fa004ab7 WY |
696 | if (zone_is_empty(zone)) |
697 | init_currently_empty_zone(zone, start_pfn, nr_pages); | |
f1dd2cd1 | 698 | resize_zone_range(zone, start_pfn, nr_pages); |
f1dd2cd1 | 699 | resize_pgdat_range(pgdat, start_pfn, nr_pages); |
f1dd2cd1 | 700 | |
1f90a347 DW |
701 | /* |
702 | * Subsection population requires care in pfn_to_online_page(). | |
703 | * Set the taint to enable the slow path detection of | |
704 | * ZONE_DEVICE pages in an otherwise ZONE_{NORMAL,MOVABLE} | |
705 | * section. | |
706 | */ | |
707 | if (zone_is_zone_device(zone)) { | |
708 | if (!IS_ALIGNED(start_pfn, PAGES_PER_SECTION)) | |
709 | section_taint_zone_device(start_pfn); | |
710 | if (!IS_ALIGNED(start_pfn + nr_pages, PAGES_PER_SECTION)) | |
711 | section_taint_zone_device(start_pfn + nr_pages); | |
712 | } | |
713 | ||
f1dd2cd1 MH |
714 | /* |
715 | * TODO now we have a visible range of pages which are not associated | |
716 | * with their zone properly. Not nice but set_pfnblock_flags_mask | |
717 | * expects the zone spans the pfn range. All the pages in the range | |
718 | * are reserved so nobody should be touching them so we should be safe | |
719 | */ | |
ab28cb6e | 720 | memmap_init_range(nr_pages, nid, zone_idx(zone), start_pfn, 0, |
d882c006 | 721 | MEMINIT_HOTPLUG, altmap, migratetype); |
f1dd2cd1 MH |
722 | |
723 | set_zone_contiguous(zone); | |
724 | } | |
725 | ||
e83a437f DH |
726 | struct auto_movable_stats { |
727 | unsigned long kernel_early_pages; | |
728 | unsigned long movable_pages; | |
729 | }; | |
730 | ||
731 | static void auto_movable_stats_account_zone(struct auto_movable_stats *stats, | |
732 | struct zone *zone) | |
733 | { | |
734 | if (zone_idx(zone) == ZONE_MOVABLE) { | |
735 | stats->movable_pages += zone->present_pages; | |
736 | } else { | |
737 | stats->kernel_early_pages += zone->present_early_pages; | |
738 | #ifdef CONFIG_CMA | |
739 | /* | |
740 | * CMA pages (never on hotplugged memory) behave like | |
741 | * ZONE_MOVABLE. | |
742 | */ | |
743 | stats->movable_pages += zone->cma_pages; | |
744 | stats->kernel_early_pages -= zone->cma_pages; | |
745 | #endif /* CONFIG_CMA */ | |
746 | } | |
747 | } | |
3fcebf90 DH |
748 | struct auto_movable_group_stats { |
749 | unsigned long movable_pages; | |
750 | unsigned long req_kernel_early_pages; | |
751 | }; | |
e83a437f | 752 | |
3fcebf90 DH |
753 | static int auto_movable_stats_account_group(struct memory_group *group, |
754 | void *arg) | |
755 | { | |
756 | const int ratio = READ_ONCE(auto_movable_ratio); | |
757 | struct auto_movable_group_stats *stats = arg; | |
758 | long pages; | |
759 | ||
760 | /* | |
761 | * We don't support modifying the config while the auto-movable online | |
762 | * policy is already enabled. Just avoid the division by zero below. | |
763 | */ | |
764 | if (!ratio) | |
765 | return 0; | |
766 | ||
767 | /* | |
768 | * Calculate how many early kernel pages this group requires to | |
769 | * satisfy the configured zone ratio. | |
770 | */ | |
771 | pages = group->present_movable_pages * 100 / ratio; | |
772 | pages -= group->present_kernel_pages; | |
773 | ||
774 | if (pages > 0) | |
775 | stats->req_kernel_early_pages += pages; | |
776 | stats->movable_pages += group->present_movable_pages; | |
777 | return 0; | |
778 | } | |
779 | ||
780 | static bool auto_movable_can_online_movable(int nid, struct memory_group *group, | |
781 | unsigned long nr_pages) | |
e83a437f | 782 | { |
e83a437f | 783 | unsigned long kernel_early_pages, movable_pages; |
3fcebf90 DH |
784 | struct auto_movable_group_stats group_stats = {}; |
785 | struct auto_movable_stats stats = {}; | |
e83a437f DH |
786 | pg_data_t *pgdat = NODE_DATA(nid); |
787 | struct zone *zone; | |
788 | int i; | |
789 | ||
790 | /* Walk all relevant zones and collect MOVABLE vs. KERNEL stats. */ | |
791 | if (nid == NUMA_NO_NODE) { | |
792 | /* TODO: cache values */ | |
793 | for_each_populated_zone(zone) | |
794 | auto_movable_stats_account_zone(&stats, zone); | |
795 | } else { | |
796 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
797 | zone = pgdat->node_zones + i; | |
798 | if (populated_zone(zone)) | |
799 | auto_movable_stats_account_zone(&stats, zone); | |
800 | } | |
801 | } | |
802 | ||
803 | kernel_early_pages = stats.kernel_early_pages; | |
804 | movable_pages = stats.movable_pages; | |
805 | ||
3fcebf90 DH |
806 | /* |
807 | * Kernel memory inside dynamic memory group allows for more MOVABLE | |
808 | * memory within the same group. Remove the effect of all but the | |
809 | * current group from the stats. | |
810 | */ | |
811 | walk_dynamic_memory_groups(nid, auto_movable_stats_account_group, | |
812 | group, &group_stats); | |
813 | if (kernel_early_pages <= group_stats.req_kernel_early_pages) | |
814 | return false; | |
815 | kernel_early_pages -= group_stats.req_kernel_early_pages; | |
816 | movable_pages -= group_stats.movable_pages; | |
817 | ||
818 | if (group && group->is_dynamic) | |
819 | kernel_early_pages += group->present_kernel_pages; | |
820 | ||
e83a437f DH |
821 | /* |
822 | * Test if we could online the given number of pages to ZONE_MOVABLE | |
823 | * and still stay in the configured ratio. | |
824 | */ | |
825 | movable_pages += nr_pages; | |
826 | return movable_pages <= (auto_movable_ratio * kernel_early_pages) / 100; | |
827 | } | |
828 | ||
c246a213 MH |
829 | /* |
830 | * Returns a default kernel memory zone for the given pfn range. | |
831 | * If no kernel zone covers this pfn range it will automatically go | |
832 | * to the ZONE_NORMAL. | |
833 | */ | |
c6f03e29 | 834 | static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn, |
c246a213 MH |
835 | unsigned long nr_pages) |
836 | { | |
837 | struct pglist_data *pgdat = NODE_DATA(nid); | |
838 | int zid; | |
839 | ||
d6aad201 | 840 | for (zid = 0; zid < ZONE_NORMAL; zid++) { |
c246a213 MH |
841 | struct zone *zone = &pgdat->node_zones[zid]; |
842 | ||
843 | if (zone_intersects(zone, start_pfn, nr_pages)) | |
844 | return zone; | |
845 | } | |
846 | ||
847 | return &pgdat->node_zones[ZONE_NORMAL]; | |
848 | } | |
849 | ||
e83a437f DH |
850 | /* |
851 | * Determine to which zone to online memory dynamically based on user | |
852 | * configuration and system stats. We care about the following ratio: | |
853 | * | |
854 | * MOVABLE : KERNEL | |
855 | * | |
856 | * Whereby MOVABLE is memory in ZONE_MOVABLE and KERNEL is memory in | |
857 | * one of the kernel zones. CMA pages inside one of the kernel zones really | |
858 | * behaves like ZONE_MOVABLE, so we treat them accordingly. | |
859 | * | |
860 | * We don't allow for hotplugged memory in a KERNEL zone to increase the | |
861 | * amount of MOVABLE memory we can have, so we end up with: | |
862 | * | |
863 | * MOVABLE : KERNEL_EARLY | |
864 | * | |
865 | * Whereby KERNEL_EARLY is memory in one of the kernel zones, available sinze | |
866 | * boot. We base our calculation on KERNEL_EARLY internally, because: | |
867 | * | |
868 | * a) Hotplugged memory in one of the kernel zones can sometimes still get | |
869 | * hotunplugged, especially when hot(un)plugging individual memory blocks. | |
870 | * There is no coordination across memory devices, therefore "automatic" | |
871 | * hotunplugging, as implemented in hypervisors, could result in zone | |
872 | * imbalances. | |
873 | * b) Early/boot memory in one of the kernel zones can usually not get | |
874 | * hotunplugged again (e.g., no firmware interface to unplug, fragmented | |
875 | * with unmovable allocations). While there are corner cases where it might | |
876 | * still work, it is barely relevant in practice. | |
877 | * | |
3fcebf90 DH |
878 | * Exceptions are dynamic memory groups, which allow for more MOVABLE |
879 | * memory within the same memory group -- because in that case, there is | |
880 | * coordination within the single memory device managed by a single driver. | |
881 | * | |
e83a437f DH |
882 | * We rely on "present pages" instead of "managed pages", as the latter is |
883 | * highly unreliable and dynamic in virtualized environments, and does not | |
884 | * consider boot time allocations. For example, memory ballooning adjusts the | |
885 | * managed pages when inflating/deflating the balloon, and balloon compaction | |
886 | * can even migrate inflated pages between zones. | |
887 | * | |
888 | * Using "present pages" is better but some things to keep in mind are: | |
889 | * | |
890 | * a) Some memblock allocations, such as for the crashkernel area, are | |
891 | * effectively unused by the kernel, yet they account to "present pages". | |
892 | * Fortunately, these allocations are comparatively small in relevant setups | |
893 | * (e.g., fraction of system memory). | |
894 | * b) Some hotplugged memory blocks in virtualized environments, esecially | |
895 | * hotplugged by virtio-mem, look like they are completely present, however, | |
896 | * only parts of the memory block are actually currently usable. | |
897 | * "present pages" is an upper limit that can get reached at runtime. As | |
898 | * we base our calculations on KERNEL_EARLY, this is not an issue. | |
899 | */ | |
445fcf7c DH |
900 | static struct zone *auto_movable_zone_for_pfn(int nid, |
901 | struct memory_group *group, | |
902 | unsigned long pfn, | |
e83a437f DH |
903 | unsigned long nr_pages) |
904 | { | |
445fcf7c DH |
905 | unsigned long online_pages = 0, max_pages, end_pfn; |
906 | struct page *page; | |
907 | ||
e83a437f DH |
908 | if (!auto_movable_ratio) |
909 | goto kernel_zone; | |
910 | ||
445fcf7c DH |
911 | if (group && !group->is_dynamic) { |
912 | max_pages = group->s.max_pages; | |
913 | online_pages = group->present_movable_pages; | |
914 | ||
915 | /* If anything is !MOVABLE online the rest !MOVABLE. */ | |
916 | if (group->present_kernel_pages) | |
917 | goto kernel_zone; | |
918 | } else if (!group || group->d.unit_pages == nr_pages) { | |
919 | max_pages = nr_pages; | |
920 | } else { | |
921 | max_pages = group->d.unit_pages; | |
922 | /* | |
923 | * Take a look at all online sections in the current unit. | |
924 | * We can safely assume that all pages within a section belong | |
925 | * to the same zone, because dynamic memory groups only deal | |
926 | * with hotplugged memory. | |
927 | */ | |
928 | pfn = ALIGN_DOWN(pfn, group->d.unit_pages); | |
929 | end_pfn = pfn + group->d.unit_pages; | |
930 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
931 | page = pfn_to_online_page(pfn); | |
932 | if (!page) | |
933 | continue; | |
934 | /* If anything is !MOVABLE online the rest !MOVABLE. */ | |
07252dfe | 935 | if (!is_zone_movable_page(page)) |
445fcf7c DH |
936 | goto kernel_zone; |
937 | online_pages += PAGES_PER_SECTION; | |
938 | } | |
939 | } | |
940 | ||
941 | /* | |
942 | * Online MOVABLE if we could *currently* online all remaining parts | |
943 | * MOVABLE. We expect to (add+) online them immediately next, so if | |
944 | * nobody interferes, all will be MOVABLE if possible. | |
945 | */ | |
946 | nr_pages = max_pages - online_pages; | |
3fcebf90 | 947 | if (!auto_movable_can_online_movable(NUMA_NO_NODE, group, nr_pages)) |
e83a437f DH |
948 | goto kernel_zone; |
949 | ||
950 | #ifdef CONFIG_NUMA | |
951 | if (auto_movable_numa_aware && | |
3fcebf90 | 952 | !auto_movable_can_online_movable(nid, group, nr_pages)) |
e83a437f DH |
953 | goto kernel_zone; |
954 | #endif /* CONFIG_NUMA */ | |
955 | ||
956 | return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
957 | kernel_zone: | |
958 | return default_kernel_zone_for_pfn(nid, pfn, nr_pages); | |
959 | } | |
960 | ||
c6f03e29 MH |
961 | static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, |
962 | unsigned long nr_pages) | |
e5e68930 | 963 | { |
c6f03e29 MH |
964 | struct zone *kernel_zone = default_kernel_zone_for_pfn(nid, start_pfn, |
965 | nr_pages); | |
966 | struct zone *movable_zone = &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
967 | bool in_kernel = zone_intersects(kernel_zone, start_pfn, nr_pages); | |
968 | bool in_movable = zone_intersects(movable_zone, start_pfn, nr_pages); | |
e5e68930 MH |
969 | |
970 | /* | |
c6f03e29 MH |
971 | * We inherit the existing zone in a simple case where zones do not |
972 | * overlap in the given range | |
e5e68930 | 973 | */ |
c6f03e29 MH |
974 | if (in_kernel ^ in_movable) |
975 | return (in_kernel) ? kernel_zone : movable_zone; | |
9f123ab5 | 976 | |
c6f03e29 MH |
977 | /* |
978 | * If the range doesn't belong to any zone or two zones overlap in the | |
979 | * given range then we use movable zone only if movable_node is | |
980 | * enabled because we always online to a kernel zone by default. | |
981 | */ | |
982 | return movable_node_enabled ? movable_zone : kernel_zone; | |
9f123ab5 MH |
983 | } |
984 | ||
7cf209ba | 985 | struct zone *zone_for_pfn_range(int online_type, int nid, |
445fcf7c | 986 | struct memory_group *group, unsigned long start_pfn, |
e5e68930 | 987 | unsigned long nr_pages) |
f1dd2cd1 | 988 | { |
c6f03e29 MH |
989 | if (online_type == MMOP_ONLINE_KERNEL) |
990 | return default_kernel_zone_for_pfn(nid, start_pfn, nr_pages); | |
f1dd2cd1 | 991 | |
c6f03e29 MH |
992 | if (online_type == MMOP_ONLINE_MOVABLE) |
993 | return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
df429ac0 | 994 | |
e83a437f | 995 | if (online_policy == ONLINE_POLICY_AUTO_MOVABLE) |
445fcf7c | 996 | return auto_movable_zone_for_pfn(nid, group, start_pfn, nr_pages); |
e83a437f | 997 | |
c6f03e29 | 998 | return default_zone_for_pfn(nid, start_pfn, nr_pages); |
e5e68930 MH |
999 | } |
1000 | ||
a08a2ae3 OS |
1001 | /* |
1002 | * This function should only be called by memory_block_{online,offline}, | |
1003 | * and {online,offline}_pages. | |
1004 | */ | |
836809ec DH |
1005 | void adjust_present_page_count(struct page *page, struct memory_group *group, |
1006 | long nr_pages) | |
f9901144 | 1007 | { |
4b097002 | 1008 | struct zone *zone = page_zone(page); |
836809ec | 1009 | const bool movable = zone_idx(zone) == ZONE_MOVABLE; |
4b097002 DH |
1010 | |
1011 | /* | |
1012 | * We only support onlining/offlining/adding/removing of complete | |
1013 | * memory blocks; therefore, either all is either early or hotplugged. | |
1014 | */ | |
1015 | if (early_section(__pfn_to_section(page_to_pfn(page)))) | |
1016 | zone->present_early_pages += nr_pages; | |
f9901144 | 1017 | zone->present_pages += nr_pages; |
f9901144 | 1018 | zone->zone_pgdat->node_present_pages += nr_pages; |
836809ec DH |
1019 | |
1020 | if (group && movable) | |
1021 | group->present_movable_pages += nr_pages; | |
1022 | else if (group && !movable) | |
1023 | group->present_kernel_pages += nr_pages; | |
f9901144 DH |
1024 | } |
1025 | ||
a08a2ae3 OS |
1026 | int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages, |
1027 | struct zone *zone) | |
1028 | { | |
1029 | unsigned long end_pfn = pfn + nr_pages; | |
66361095 | 1030 | int ret, i; |
a08a2ae3 OS |
1031 | |
1032 | ret = kasan_add_zero_shadow(__va(PFN_PHYS(pfn)), PFN_PHYS(nr_pages)); | |
1033 | if (ret) | |
1034 | return ret; | |
1035 | ||
1036 | move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_UNMOVABLE); | |
1037 | ||
66361095 MS |
1038 | for (i = 0; i < nr_pages; i++) |
1039 | SetPageVmemmapSelfHosted(pfn_to_page(pfn + i)); | |
1040 | ||
a08a2ae3 OS |
1041 | /* |
1042 | * It might be that the vmemmap_pages fully span sections. If that is | |
1043 | * the case, mark those sections online here as otherwise they will be | |
1044 | * left offline. | |
1045 | */ | |
1046 | if (nr_pages >= PAGES_PER_SECTION) | |
1047 | online_mem_sections(pfn, ALIGN_DOWN(end_pfn, PAGES_PER_SECTION)); | |
1048 | ||
1049 | return ret; | |
1050 | } | |
1051 | ||
1052 | void mhp_deinit_memmap_on_memory(unsigned long pfn, unsigned long nr_pages) | |
1053 | { | |
1054 | unsigned long end_pfn = pfn + nr_pages; | |
1055 | ||
1056 | /* | |
1057 | * It might be that the vmemmap_pages fully span sections. If that is | |
1058 | * the case, mark those sections offline here as otherwise they will be | |
1059 | * left online. | |
1060 | */ | |
1061 | if (nr_pages >= PAGES_PER_SECTION) | |
1062 | offline_mem_sections(pfn, ALIGN_DOWN(end_pfn, PAGES_PER_SECTION)); | |
1063 | ||
1064 | /* | |
1065 | * The pages associated with this vmemmap have been offlined, so | |
1066 | * we can reset its state here. | |
1067 | */ | |
1068 | remove_pfn_range_from_zone(page_zone(pfn_to_page(pfn)), pfn, nr_pages); | |
1069 | kasan_remove_zero_shadow(__va(PFN_PHYS(pfn)), PFN_PHYS(nr_pages)); | |
1070 | } | |
1071 | ||
836809ec DH |
1072 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, |
1073 | struct zone *zone, struct memory_group *group) | |
75884fb1 | 1074 | { |
aa47228a | 1075 | unsigned long flags; |
6811378e | 1076 | int need_zonelists_rebuild = 0; |
a08a2ae3 | 1077 | const int nid = zone_to_nid(zone); |
7b78d335 YG |
1078 | int ret; |
1079 | struct memory_notify arg; | |
d0dc12e8 | 1080 | |
dd8e2f23 OS |
1081 | /* |
1082 | * {on,off}lining is constrained to full memory sections (or more | |
041711ce | 1083 | * precisely to memory blocks from the user space POV). |
dd8e2f23 OS |
1084 | * memmap_on_memory is an exception because it reserves initial part |
1085 | * of the physical memory space for vmemmaps. That space is pageblock | |
1086 | * aligned. | |
1087 | */ | |
4986fac1 | 1088 | if (WARN_ON_ONCE(!nr_pages || |
dd8e2f23 OS |
1089 | !IS_ALIGNED(pfn, pageblock_nr_pages) || |
1090 | !IS_ALIGNED(pfn + nr_pages, PAGES_PER_SECTION))) | |
4986fac1 DH |
1091 | return -EINVAL; |
1092 | ||
381eab4a DH |
1093 | mem_hotplug_begin(); |
1094 | ||
f1dd2cd1 | 1095 | /* associate pfn range with the zone */ |
b30c5927 | 1096 | move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_ISOLATE); |
f1dd2cd1 | 1097 | |
7b78d335 YG |
1098 | arg.start_pfn = pfn; |
1099 | arg.nr_pages = nr_pages; | |
d9713679 | 1100 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 | 1101 | |
7b78d335 YG |
1102 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
1103 | ret = notifier_to_errno(ret); | |
e33e33b4 CY |
1104 | if (ret) |
1105 | goto failed_addition; | |
1106 | ||
b30c5927 DH |
1107 | /* |
1108 | * Fixup the number of isolated pageblocks before marking the sections | |
1109 | * onlining, such that undo_isolate_page_range() works correctly. | |
1110 | */ | |
1111 | spin_lock_irqsave(&zone->lock, flags); | |
1112 | zone->nr_isolate_pageblock += nr_pages / pageblock_nr_pages; | |
1113 | spin_unlock_irqrestore(&zone->lock, flags); | |
1114 | ||
6811378e YG |
1115 | /* |
1116 | * If this zone is not populated, then it is not in zonelist. | |
1117 | * This means the page allocator ignores this zone. | |
1118 | * So, zonelist must be updated after online. | |
1119 | */ | |
6dcd73d7 | 1120 | if (!populated_zone(zone)) { |
6811378e | 1121 | need_zonelists_rebuild = 1; |
72675e13 | 1122 | setup_zone_pageset(zone); |
6dcd73d7 | 1123 | } |
6811378e | 1124 | |
aac65321 | 1125 | online_pages_range(pfn, nr_pages); |
836809ec | 1126 | adjust_present_page_count(pfn_to_page(pfn), group, nr_pages); |
aa47228a | 1127 | |
b30c5927 DH |
1128 | node_states_set_node(nid, &arg); |
1129 | if (need_zonelists_rebuild) | |
1130 | build_all_zonelists(NULL); | |
b30c5927 DH |
1131 | |
1132 | /* Basic onlining is complete, allow allocation of onlined pages. */ | |
1133 | undo_isolate_page_range(pfn, pfn + nr_pages, MIGRATE_MOVABLE); | |
1134 | ||
93146d98 | 1135 | /* |
b86c5fc4 DH |
1136 | * Freshly onlined pages aren't shuffled (e.g., all pages are placed to |
1137 | * the tail of the freelist when undoing isolation). Shuffle the whole | |
1138 | * zone to make sure the just onlined pages are properly distributed | |
1139 | * across the whole freelist - to create an initial shuffle. | |
93146d98 | 1140 | */ |
e900a918 DW |
1141 | shuffle_zone(zone); |
1142 | ||
b92ca18e | 1143 | /* reinitialise watermarks and update pcp limits */ |
1b79acc9 KM |
1144 | init_per_zone_wmark_min(); |
1145 | ||
ca9a46f8 DH |
1146 | kswapd_run(nid); |
1147 | kcompactd_run(nid); | |
61b13993 | 1148 | |
2d1d43f6 | 1149 | writeback_set_ratelimit(); |
7b78d335 | 1150 | |
ca9a46f8 | 1151 | memory_notify(MEM_ONLINE, &arg); |
381eab4a | 1152 | mem_hotplug_done(); |
30467e0b | 1153 | return 0; |
e33e33b4 CY |
1154 | |
1155 | failed_addition: | |
1156 | pr_debug("online_pages [mem %#010llx-%#010llx] failed\n", | |
1157 | (unsigned long long) pfn << PAGE_SHIFT, | |
1158 | (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1); | |
1159 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
feee6b29 | 1160 | remove_pfn_range_from_zone(zone, pfn, nr_pages); |
381eab4a | 1161 | mem_hotplug_done(); |
e33e33b4 | 1162 | return ret; |
3947be19 | 1163 | } |
bc02af93 | 1164 | |
0bd85420 TC |
1165 | static void reset_node_present_pages(pg_data_t *pgdat) |
1166 | { | |
1167 | struct zone *z; | |
1168 | ||
1169 | for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) | |
1170 | z->present_pages = 0; | |
1171 | ||
1172 | pgdat->node_present_pages = 0; | |
1173 | } | |
1174 | ||
e1319331 | 1175 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
09f49dca | 1176 | static pg_data_t __ref *hotadd_init_pgdat(int nid) |
9af3c2de YG |
1177 | { |
1178 | struct pglist_data *pgdat; | |
9af3c2de | 1179 | |
09f49dca MH |
1180 | /* |
1181 | * NODE_DATA is preallocated (free_area_init) but its internal | |
1182 | * state is not allocated completely. Add missing pieces. | |
1183 | * Completely offline nodes stay around and they just need | |
1184 | * reintialization. | |
1185 | */ | |
70b5b46a | 1186 | pgdat = NODE_DATA(nid); |
03e85f9d | 1187 | |
9af3c2de | 1188 | /* init node's zones as empty zones, we don't have any present pages.*/ |
70b5b46a | 1189 | free_area_init_core_hotplug(pgdat); |
9af3c2de | 1190 | |
959ecc48 KH |
1191 | /* |
1192 | * The node we allocated has no zone fallback lists. For avoiding | |
1193 | * to access not-initialized zonelist, build here. | |
1194 | */ | |
72675e13 | 1195 | build_all_zonelists(pgdat); |
959ecc48 | 1196 | |
0bd85420 TC |
1197 | /* |
1198 | * When memory is hot-added, all the memory is in offline state. So | |
1199 | * clear all zones' present_pages because they will be updated in | |
1200 | * online_pages() and offline_pages(). | |
70b5b46a | 1201 | * TODO: should be in free_area_init_core_hotplug? |
0bd85420 | 1202 | */ |
03e85f9d | 1203 | reset_node_managed_pages(pgdat); |
0bd85420 TC |
1204 | reset_node_present_pages(pgdat); |
1205 | ||
9af3c2de YG |
1206 | return pgdat; |
1207 | } | |
1208 | ||
ba2d2666 MG |
1209 | /* |
1210 | * __try_online_node - online a node if offlined | |
e8b098fc | 1211 | * @nid: the node ID |
b9ff0360 | 1212 | * @set_node_online: Whether we want to online the node |
cf23422b | 1213 | * called by cpu_up() to online a node without onlined memory. |
b9ff0360 OS |
1214 | * |
1215 | * Returns: | |
1216 | * 1 -> a new node has been allocated | |
1217 | * 0 -> the node is already online | |
1218 | * -ENOMEM -> the node could not be allocated | |
cf23422b | 1219 | */ |
c68ab18c | 1220 | static int __try_online_node(int nid, bool set_node_online) |
cf23422b | 1221 | { |
b9ff0360 OS |
1222 | pg_data_t *pgdat; |
1223 | int ret = 1; | |
cf23422b | 1224 | |
01b0f197 TK |
1225 | if (node_online(nid)) |
1226 | return 0; | |
1227 | ||
09f49dca | 1228 | pgdat = hotadd_init_pgdat(nid); |
7553e8f2 | 1229 | if (!pgdat) { |
01b0f197 | 1230 | pr_err("Cannot online node %d due to NULL pgdat\n", nid); |
cf23422b | 1231 | ret = -ENOMEM; |
1232 | goto out; | |
1233 | } | |
b9ff0360 OS |
1234 | |
1235 | if (set_node_online) { | |
1236 | node_set_online(nid); | |
1237 | ret = register_one_node(nid); | |
1238 | BUG_ON(ret); | |
1239 | } | |
cf23422b | 1240 | out: |
b9ff0360 OS |
1241 | return ret; |
1242 | } | |
1243 | ||
1244 | /* | |
1245 | * Users of this function always want to online/register the node | |
1246 | */ | |
1247 | int try_online_node(int nid) | |
1248 | { | |
1249 | int ret; | |
1250 | ||
1251 | mem_hotplug_begin(); | |
c68ab18c | 1252 | ret = __try_online_node(nid, true); |
bfc8c901 | 1253 | mem_hotplug_done(); |
cf23422b | 1254 | return ret; |
1255 | } | |
1256 | ||
27356f54 TK |
1257 | static int check_hotplug_memory_range(u64 start, u64 size) |
1258 | { | |
ba325585 | 1259 | /* memory range must be block size aligned */ |
cec3ebd0 DH |
1260 | if (!size || !IS_ALIGNED(start, memory_block_size_bytes()) || |
1261 | !IS_ALIGNED(size, memory_block_size_bytes())) { | |
ba325585 | 1262 | pr_err("Block size [%#lx] unaligned hotplug range: start %#llx, size %#llx", |
cec3ebd0 | 1263 | memory_block_size_bytes(), start, size); |
27356f54 TK |
1264 | return -EINVAL; |
1265 | } | |
1266 | ||
1267 | return 0; | |
1268 | } | |
1269 | ||
31bc3858 VK |
1270 | static int online_memory_block(struct memory_block *mem, void *arg) |
1271 | { | |
1adf8b46 | 1272 | mem->online_type = mhp_default_online_type; |
dc18d706 | 1273 | return device_online(&mem->dev); |
31bc3858 VK |
1274 | } |
1275 | ||
a08a2ae3 OS |
1276 | bool mhp_supports_memmap_on_memory(unsigned long size) |
1277 | { | |
1278 | unsigned long nr_vmemmap_pages = size / PAGE_SIZE; | |
1279 | unsigned long vmemmap_size = nr_vmemmap_pages * sizeof(struct page); | |
1280 | unsigned long remaining_size = size - vmemmap_size; | |
1281 | ||
1282 | /* | |
1283 | * Besides having arch support and the feature enabled at runtime, we | |
1284 | * need a few more assumptions to hold true: | |
1285 | * | |
1286 | * a) We span a single memory block: memory onlining/offlinin;g happens | |
1287 | * in memory block granularity. We don't want the vmemmap of online | |
1288 | * memory blocks to reside on offline memory blocks. In the future, | |
1289 | * we might want to support variable-sized memory blocks to make the | |
1290 | * feature more versatile. | |
1291 | * | |
1292 | * b) The vmemmap pages span complete PMDs: We don't want vmemmap code | |
1293 | * to populate memory from the altmap for unrelated parts (i.e., | |
1294 | * other memory blocks) | |
1295 | * | |
1296 | * c) The vmemmap pages (and thereby the pages that will be exposed to | |
1297 | * the buddy) have to cover full pageblocks: memory onlining/offlining | |
1298 | * code requires applicable ranges to be page-aligned, for example, to | |
1299 | * set the migratetypes properly. | |
1300 | * | |
1301 | * TODO: Although we have a check here to make sure that vmemmap pages | |
1302 | * fully populate a PMD, it is not the right place to check for | |
1303 | * this. A much better solution involves improving vmemmap code | |
1304 | * to fallback to base pages when trying to populate vmemmap using | |
1305 | * altmap as an alternative source of memory, and we do not exactly | |
1306 | * populate a single PMD. | |
1307 | */ | |
6e02c46b | 1308 | return mhp_memmap_on_memory() && |
a08a2ae3 OS |
1309 | size == memory_block_size_bytes() && |
1310 | IS_ALIGNED(vmemmap_size, PMD_SIZE) && | |
1311 | IS_ALIGNED(remaining_size, (pageblock_nr_pages << PAGE_SHIFT)); | |
1312 | } | |
1313 | ||
8df1d0e4 DH |
1314 | /* |
1315 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1316 | * and online/offline operations (triggered e.g. by sysfs). | |
1317 | * | |
1318 | * we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG | |
1319 | */ | |
b6117199 | 1320 | int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags) |
bc02af93 | 1321 | { |
d15dfd31 | 1322 | struct mhp_params params = { .pgprot = pgprot_mhp(PAGE_KERNEL) }; |
32befe9e | 1323 | enum memblock_flags memblock_flags = MEMBLOCK_NONE; |
a08a2ae3 | 1324 | struct vmem_altmap mhp_altmap = {}; |
028fc57a | 1325 | struct memory_group *group = NULL; |
62cedb9f | 1326 | u64 start, size; |
b9ff0360 | 1327 | bool new_node = false; |
bc02af93 YG |
1328 | int ret; |
1329 | ||
62cedb9f DV |
1330 | start = res->start; |
1331 | size = resource_size(res); | |
1332 | ||
27356f54 TK |
1333 | ret = check_hotplug_memory_range(start, size); |
1334 | if (ret) | |
1335 | return ret; | |
1336 | ||
028fc57a DH |
1337 | if (mhp_flags & MHP_NID_IS_MGID) { |
1338 | group = memory_group_find_by_id(nid); | |
1339 | if (!group) | |
1340 | return -EINVAL; | |
1341 | nid = group->nid; | |
1342 | } | |
1343 | ||
fa6d9ec7 VV |
1344 | if (!node_possible(nid)) { |
1345 | WARN(1, "node %d was absent from the node_possible_map\n", nid); | |
1346 | return -EINVAL; | |
1347 | } | |
1348 | ||
bfc8c901 | 1349 | mem_hotplug_begin(); |
ac13c462 | 1350 | |
53d38316 | 1351 | if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) { |
32befe9e DH |
1352 | if (res->flags & IORESOURCE_SYSRAM_DRIVER_MANAGED) |
1353 | memblock_flags = MEMBLOCK_DRIVER_MANAGED; | |
1354 | ret = memblock_add_node(start, size, nid, memblock_flags); | |
53d38316 DH |
1355 | if (ret) |
1356 | goto error_mem_hotplug_end; | |
1357 | } | |
7f36e3e5 | 1358 | |
c68ab18c | 1359 | ret = __try_online_node(nid, false); |
b9ff0360 OS |
1360 | if (ret < 0) |
1361 | goto error; | |
1362 | new_node = ret; | |
9af3c2de | 1363 | |
a08a2ae3 OS |
1364 | /* |
1365 | * Self hosted memmap array | |
1366 | */ | |
1367 | if (mhp_flags & MHP_MEMMAP_ON_MEMORY) { | |
1368 | if (!mhp_supports_memmap_on_memory(size)) { | |
1369 | ret = -EINVAL; | |
1370 | goto error; | |
1371 | } | |
1372 | mhp_altmap.free = PHYS_PFN(size); | |
1373 | mhp_altmap.base_pfn = PHYS_PFN(start); | |
1374 | params.altmap = &mhp_altmap; | |
1375 | } | |
1376 | ||
bc02af93 | 1377 | /* call arch's memory hotadd */ |
f5637d3b | 1378 | ret = arch_add_memory(nid, start, size, ¶ms); |
9af3c2de YG |
1379 | if (ret < 0) |
1380 | goto error; | |
1381 | ||
db051a0d | 1382 | /* create memory block devices after memory was added */ |
028fc57a DH |
1383 | ret = create_memory_block_devices(start, size, mhp_altmap.alloc, |
1384 | group); | |
db051a0d | 1385 | if (ret) { |
65a2aa5f | 1386 | arch_remove_memory(start, size, NULL); |
db051a0d DH |
1387 | goto error; |
1388 | } | |
1389 | ||
a1e565aa | 1390 | if (new_node) { |
d5b6f6a3 | 1391 | /* If sysfs file of new node can't be created, cpu on the node |
0fc44159 YG |
1392 | * can't be hot-added. There is no rollback way now. |
1393 | * So, check by BUG_ON() to catch it reluctantly.. | |
d5b6f6a3 | 1394 | * We online node here. We can't roll back from here. |
0fc44159 | 1395 | */ |
d5b6f6a3 OS |
1396 | node_set_online(nid); |
1397 | ret = __register_one_node(nid); | |
0fc44159 YG |
1398 | BUG_ON(ret); |
1399 | } | |
1400 | ||
cc651559 DH |
1401 | register_memory_blocks_under_node(nid, PFN_DOWN(start), |
1402 | PFN_UP(start + size - 1), | |
1403 | MEMINIT_HOTPLUG); | |
d5b6f6a3 | 1404 | |
d96ae530 | 1405 | /* create new memmap entry */ |
7b7b2721 DH |
1406 | if (!strcmp(res->name, "System RAM")) |
1407 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
d96ae530 | 1408 | |
381eab4a DH |
1409 | /* device_online() will take the lock when calling online_pages() */ |
1410 | mem_hotplug_done(); | |
1411 | ||
9ca6551e DH |
1412 | /* |
1413 | * In case we're allowed to merge the resource, flag it and trigger | |
1414 | * merging now that adding succeeded. | |
1415 | */ | |
26011267 | 1416 | if (mhp_flags & MHP_MERGE_RESOURCE) |
9ca6551e DH |
1417 | merge_system_ram_resource(res); |
1418 | ||
31bc3858 | 1419 | /* online pages if requested */ |
1adf8b46 | 1420 | if (mhp_default_online_type != MMOP_OFFLINE) |
fbcf73ce | 1421 | walk_memory_blocks(start, size, NULL, online_memory_block); |
31bc3858 | 1422 | |
381eab4a | 1423 | return ret; |
9af3c2de | 1424 | error: |
52219aea DH |
1425 | if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) |
1426 | memblock_remove(start, size); | |
53d38316 | 1427 | error_mem_hotplug_end: |
bfc8c901 | 1428 | mem_hotplug_done(); |
bc02af93 YG |
1429 | return ret; |
1430 | } | |
62cedb9f | 1431 | |
8df1d0e4 | 1432 | /* requires device_hotplug_lock, see add_memory_resource() */ |
b6117199 | 1433 | int __ref __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags) |
62cedb9f DV |
1434 | { |
1435 | struct resource *res; | |
1436 | int ret; | |
1437 | ||
7b7b2721 | 1438 | res = register_memory_resource(start, size, "System RAM"); |
6f754ba4 VK |
1439 | if (IS_ERR(res)) |
1440 | return PTR_ERR(res); | |
62cedb9f | 1441 | |
b6117199 | 1442 | ret = add_memory_resource(nid, res, mhp_flags); |
62cedb9f DV |
1443 | if (ret < 0) |
1444 | release_memory_resource(res); | |
1445 | return ret; | |
1446 | } | |
8df1d0e4 | 1447 | |
b6117199 | 1448 | int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags) |
8df1d0e4 DH |
1449 | { |
1450 | int rc; | |
1451 | ||
1452 | lock_device_hotplug(); | |
b6117199 | 1453 | rc = __add_memory(nid, start, size, mhp_flags); |
8df1d0e4 DH |
1454 | unlock_device_hotplug(); |
1455 | ||
1456 | return rc; | |
1457 | } | |
bc02af93 | 1458 | EXPORT_SYMBOL_GPL(add_memory); |
0c0e6195 | 1459 | |
7b7b2721 DH |
1460 | /* |
1461 | * Add special, driver-managed memory to the system as system RAM. Such | |
1462 | * memory is not exposed via the raw firmware-provided memmap as system | |
1463 | * RAM, instead, it is detected and added by a driver - during cold boot, | |
1464 | * after a reboot, and after kexec. | |
1465 | * | |
1466 | * Reasons why this memory should not be used for the initial memmap of a | |
1467 | * kexec kernel or for placing kexec images: | |
1468 | * - The booting kernel is in charge of determining how this memory will be | |
1469 | * used (e.g., use persistent memory as system RAM) | |
1470 | * - Coordination with a hypervisor is required before this memory | |
1471 | * can be used (e.g., inaccessible parts). | |
1472 | * | |
1473 | * For this memory, no entries in /sys/firmware/memmap ("raw firmware-provided | |
1474 | * memory map") are created. Also, the created memory resource is flagged | |
7cf603d1 | 1475 | * with IORESOURCE_SYSRAM_DRIVER_MANAGED, so in-kernel users can special-case |
7b7b2721 DH |
1476 | * this memory as well (esp., not place kexec images onto it). |
1477 | * | |
1478 | * The resource_name (visible via /proc/iomem) has to have the format | |
1479 | * "System RAM ($DRIVER)". | |
1480 | */ | |
1481 | int add_memory_driver_managed(int nid, u64 start, u64 size, | |
b6117199 | 1482 | const char *resource_name, mhp_t mhp_flags) |
7b7b2721 DH |
1483 | { |
1484 | struct resource *res; | |
1485 | int rc; | |
1486 | ||
1487 | if (!resource_name || | |
1488 | strstr(resource_name, "System RAM (") != resource_name || | |
1489 | resource_name[strlen(resource_name) - 1] != ')') | |
1490 | return -EINVAL; | |
1491 | ||
1492 | lock_device_hotplug(); | |
1493 | ||
1494 | res = register_memory_resource(start, size, resource_name); | |
1495 | if (IS_ERR(res)) { | |
1496 | rc = PTR_ERR(res); | |
1497 | goto out_unlock; | |
1498 | } | |
1499 | ||
b6117199 | 1500 | rc = add_memory_resource(nid, res, mhp_flags); |
7b7b2721 DH |
1501 | if (rc < 0) |
1502 | release_memory_resource(res); | |
1503 | ||
1504 | out_unlock: | |
1505 | unlock_device_hotplug(); | |
1506 | return rc; | |
1507 | } | |
1508 | EXPORT_SYMBOL_GPL(add_memory_driver_managed); | |
1509 | ||
bca3feaa AK |
1510 | /* |
1511 | * Platforms should define arch_get_mappable_range() that provides | |
1512 | * maximum possible addressable physical memory range for which the | |
1513 | * linear mapping could be created. The platform returned address | |
1514 | * range must adhere to these following semantics. | |
1515 | * | |
1516 | * - range.start <= range.end | |
1517 | * - Range includes both end points [range.start..range.end] | |
1518 | * | |
1519 | * There is also a fallback definition provided here, allowing the | |
1520 | * entire possible physical address range in case any platform does | |
1521 | * not define arch_get_mappable_range(). | |
1522 | */ | |
1523 | struct range __weak arch_get_mappable_range(void) | |
1524 | { | |
1525 | struct range mhp_range = { | |
1526 | .start = 0UL, | |
1527 | .end = -1ULL, | |
1528 | }; | |
1529 | return mhp_range; | |
1530 | } | |
1531 | ||
1532 | struct range mhp_get_pluggable_range(bool need_mapping) | |
1533 | { | |
1534 | const u64 max_phys = (1ULL << MAX_PHYSMEM_BITS) - 1; | |
1535 | struct range mhp_range; | |
1536 | ||
1537 | if (need_mapping) { | |
1538 | mhp_range = arch_get_mappable_range(); | |
1539 | if (mhp_range.start > max_phys) { | |
1540 | mhp_range.start = 0; | |
1541 | mhp_range.end = 0; | |
1542 | } | |
1543 | mhp_range.end = min_t(u64, mhp_range.end, max_phys); | |
1544 | } else { | |
1545 | mhp_range.start = 0; | |
1546 | mhp_range.end = max_phys; | |
1547 | } | |
1548 | return mhp_range; | |
1549 | } | |
1550 | EXPORT_SYMBOL_GPL(mhp_get_pluggable_range); | |
1551 | ||
1552 | bool mhp_range_allowed(u64 start, u64 size, bool need_mapping) | |
1553 | { | |
1554 | struct range mhp_range = mhp_get_pluggable_range(need_mapping); | |
1555 | u64 end = start + size; | |
1556 | ||
1557 | if (start < end && start >= mhp_range.start && (end - 1) <= mhp_range.end) | |
1558 | return true; | |
1559 | ||
1560 | pr_warn("Hotplug memory [%#llx-%#llx] exceeds maximum addressable range [%#llx-%#llx]\n", | |
1561 | start, end, mhp_range.start, mhp_range.end); | |
1562 | return false; | |
1563 | } | |
1564 | ||
0c0e6195 | 1565 | #ifdef CONFIG_MEMORY_HOTREMOVE |
0c0e6195 | 1566 | /* |
0efadf48 | 1567 | * Scan pfn range [start,end) to find movable/migratable pages (LRU pages, |
aa218795 DH |
1568 | * non-lru movable pages and hugepages). Will skip over most unmovable |
1569 | * pages (esp., pages that can be skipped when offlining), but bail out on | |
1570 | * definitely unmovable pages. | |
1571 | * | |
1572 | * Returns: | |
1573 | * 0 in case a movable page is found and movable_pfn was updated. | |
1574 | * -ENOENT in case no movable page was found. | |
1575 | * -EBUSY in case a definitely unmovable page was found. | |
0c0e6195 | 1576 | */ |
aa218795 DH |
1577 | static int scan_movable_pages(unsigned long start, unsigned long end, |
1578 | unsigned long *movable_pfn) | |
0c0e6195 KH |
1579 | { |
1580 | unsigned long pfn; | |
eeb0efd0 | 1581 | |
0c0e6195 | 1582 | for (pfn = start; pfn < end; pfn++) { |
eeb0efd0 OS |
1583 | struct page *page, *head; |
1584 | unsigned long skip; | |
1585 | ||
1586 | if (!pfn_valid(pfn)) | |
1587 | continue; | |
1588 | page = pfn_to_page(pfn); | |
1589 | if (PageLRU(page)) | |
aa218795 | 1590 | goto found; |
eeb0efd0 | 1591 | if (__PageMovable(page)) |
aa218795 DH |
1592 | goto found; |
1593 | ||
1594 | /* | |
1595 | * PageOffline() pages that are not marked __PageMovable() and | |
1596 | * have a reference count > 0 (after MEM_GOING_OFFLINE) are | |
1597 | * definitely unmovable. If their reference count would be 0, | |
1598 | * they could at least be skipped when offlining memory. | |
1599 | */ | |
1600 | if (PageOffline(page) && page_count(page)) | |
1601 | return -EBUSY; | |
eeb0efd0 OS |
1602 | |
1603 | if (!PageHuge(page)) | |
1604 | continue; | |
1605 | head = compound_head(page); | |
8f251a3d MK |
1606 | /* |
1607 | * This test is racy as we hold no reference or lock. The | |
1608 | * hugetlb page could have been free'ed and head is no longer | |
1609 | * a hugetlb page before the following check. In such unlikely | |
1610 | * cases false positives and negatives are possible. Calling | |
1611 | * code must deal with these scenarios. | |
1612 | */ | |
1613 | if (HPageMigratable(head)) | |
aa218795 | 1614 | goto found; |
d8c6546b | 1615 | skip = compound_nr(head) - (page - head); |
eeb0efd0 | 1616 | pfn += skip - 1; |
0c0e6195 | 1617 | } |
aa218795 DH |
1618 | return -ENOENT; |
1619 | found: | |
1620 | *movable_pfn = pfn; | |
0c0e6195 KH |
1621 | return 0; |
1622 | } | |
1623 | ||
0c0e6195 KH |
1624 | static int |
1625 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1626 | { | |
1627 | unsigned long pfn; | |
6c357848 | 1628 | struct page *page, *head; |
0c0e6195 KH |
1629 | int ret = 0; |
1630 | LIST_HEAD(source); | |
786dee86 LM |
1631 | static DEFINE_RATELIMIT_STATE(migrate_rs, DEFAULT_RATELIMIT_INTERVAL, |
1632 | DEFAULT_RATELIMIT_BURST); | |
0c0e6195 | 1633 | |
a85009c3 | 1634 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { |
869f7ee6 MWO |
1635 | struct folio *folio; |
1636 | ||
0c0e6195 KH |
1637 | if (!pfn_valid(pfn)) |
1638 | continue; | |
1639 | page = pfn_to_page(pfn); | |
869f7ee6 MWO |
1640 | folio = page_folio(page); |
1641 | head = &folio->page; | |
c8721bbb NH |
1642 | |
1643 | if (PageHuge(page)) { | |
d8c6546b | 1644 | pfn = page_to_pfn(head) + compound_nr(head) - 1; |
7ce82f4c | 1645 | isolate_hugetlb(head, &source); |
c8721bbb | 1646 | continue; |
94723aaf | 1647 | } else if (PageTransHuge(page)) |
6c357848 | 1648 | pfn = page_to_pfn(head) + thp_nr_pages(page) - 1; |
c8721bbb | 1649 | |
b15c8726 MH |
1650 | /* |
1651 | * HWPoison pages have elevated reference counts so the migration would | |
1652 | * fail on them. It also doesn't make any sense to migrate them in the | |
1653 | * first place. Still try to unmap such a page in case it is still mapped | |
1654 | * (e.g. current hwpoison implementation doesn't unmap KSM pages but keep | |
1655 | * the unmap as the catch all safety net). | |
1656 | */ | |
1657 | if (PageHWPoison(page)) { | |
869f7ee6 MWO |
1658 | if (WARN_ON(folio_test_lru(folio))) |
1659 | folio_isolate_lru(folio); | |
1660 | if (folio_mapped(folio)) | |
1661 | try_to_unmap(folio, TTU_IGNORE_MLOCK); | |
b15c8726 MH |
1662 | continue; |
1663 | } | |
1664 | ||
700c2a46 | 1665 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1666 | continue; |
1667 | /* | |
0efadf48 YX |
1668 | * We can skip free pages. And we can deal with pages on |
1669 | * LRU and non-lru movable pages. | |
0c0e6195 | 1670 | */ |
0efadf48 YX |
1671 | if (PageLRU(page)) |
1672 | ret = isolate_lru_page(page); | |
1673 | else | |
1674 | ret = isolate_movable_page(page, ISOLATE_UNEVICTABLE); | |
0c0e6195 | 1675 | if (!ret) { /* Success */ |
62695a84 | 1676 | list_add_tail(&page->lru, &source); |
0efadf48 YX |
1677 | if (!__PageMovable(page)) |
1678 | inc_node_page_state(page, NR_ISOLATED_ANON + | |
9de4f22a | 1679 | page_is_file_lru(page)); |
6d9c285a | 1680 | |
0c0e6195 | 1681 | } else { |
786dee86 LM |
1682 | if (__ratelimit(&migrate_rs)) { |
1683 | pr_warn("failed to isolate pfn %lx\n", pfn); | |
1684 | dump_page(page, "isolation failed"); | |
1685 | } | |
0c0e6195 | 1686 | } |
1723058e | 1687 | put_page(page); |
0c0e6195 | 1688 | } |
f3ab2636 | 1689 | if (!list_empty(&source)) { |
203e6e5c JK |
1690 | nodemask_t nmask = node_states[N_MEMORY]; |
1691 | struct migration_target_control mtc = { | |
1692 | .nmask = &nmask, | |
1693 | .gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL, | |
1694 | }; | |
1695 | ||
1696 | /* | |
1697 | * We have checked that migration range is on a single zone so | |
1698 | * we can use the nid of the first page to all the others. | |
1699 | */ | |
1700 | mtc.nid = page_to_nid(list_first_entry(&source, struct page, lru)); | |
1701 | ||
1702 | /* | |
1703 | * try to allocate from a different node but reuse this node | |
1704 | * if there are no other online nodes to be used (e.g. we are | |
1705 | * offlining a part of the only existing node) | |
1706 | */ | |
1707 | node_clear(mtc.nid, nmask); | |
1708 | if (nodes_empty(nmask)) | |
1709 | node_set(mtc.nid, nmask); | |
1710 | ret = migrate_pages(&source, alloc_migration_target, NULL, | |
5ac95884 | 1711 | (unsigned long)&mtc, MIGRATE_SYNC, MR_MEMORY_HOTPLUG, NULL); |
2932c8b0 MH |
1712 | if (ret) { |
1713 | list_for_each_entry(page, &source, lru) { | |
786dee86 LM |
1714 | if (__ratelimit(&migrate_rs)) { |
1715 | pr_warn("migrating pfn %lx failed ret:%d\n", | |
1716 | page_to_pfn(page), ret); | |
1717 | dump_page(page, "migration failure"); | |
1718 | } | |
2932c8b0 | 1719 | } |
c8721bbb | 1720 | putback_movable_pages(&source); |
2932c8b0 | 1721 | } |
0c0e6195 | 1722 | } |
1723058e | 1723 | |
0c0e6195 KH |
1724 | return ret; |
1725 | } | |
1726 | ||
c5320926 TC |
1727 | static int __init cmdline_parse_movable_node(char *p) |
1728 | { | |
55ac590c | 1729 | movable_node_enabled = true; |
c5320926 TC |
1730 | return 0; |
1731 | } | |
1732 | early_param("movable_node", cmdline_parse_movable_node); | |
1733 | ||
d9713679 LJ |
1734 | /* check which state of node_states will be changed when offline memory */ |
1735 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1736 | struct zone *zone, struct memory_notify *arg) | |
1737 | { | |
1738 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1739 | unsigned long present_pages = 0; | |
86b27bea | 1740 | enum zone_type zt; |
d9713679 | 1741 | |
98fa15f3 AK |
1742 | arg->status_change_nid = NUMA_NO_NODE; |
1743 | arg->status_change_nid_normal = NUMA_NO_NODE; | |
d9713679 LJ |
1744 | |
1745 | /* | |
86b27bea OS |
1746 | * Check whether node_states[N_NORMAL_MEMORY] will be changed. |
1747 | * If the memory to be offline is within the range | |
1748 | * [0..ZONE_NORMAL], and it is the last present memory there, | |
1749 | * the zones in that range will become empty after the offlining, | |
1750 | * thus we can determine that we need to clear the node from | |
1751 | * node_states[N_NORMAL_MEMORY]. | |
d9713679 | 1752 | */ |
86b27bea | 1753 | for (zt = 0; zt <= ZONE_NORMAL; zt++) |
d9713679 | 1754 | present_pages += pgdat->node_zones[zt].present_pages; |
86b27bea | 1755 | if (zone_idx(zone) <= ZONE_NORMAL && nr_pages >= present_pages) |
d9713679 | 1756 | arg->status_change_nid_normal = zone_to_nid(zone); |
d9713679 LJ |
1757 | |
1758 | /* | |
6b740c6c DH |
1759 | * We have accounted the pages from [0..ZONE_NORMAL); ZONE_HIGHMEM |
1760 | * does not apply as we don't support 32bit. | |
86b27bea OS |
1761 | * Here we count the possible pages from ZONE_MOVABLE. |
1762 | * If after having accounted all the pages, we see that the nr_pages | |
1763 | * to be offlined is over or equal to the accounted pages, | |
1764 | * we know that the node will become empty, and so, we can clear | |
1765 | * it for N_MEMORY as well. | |
d9713679 | 1766 | */ |
86b27bea | 1767 | present_pages += pgdat->node_zones[ZONE_MOVABLE].present_pages; |
d9713679 | 1768 | |
d9713679 LJ |
1769 | if (nr_pages >= present_pages) |
1770 | arg->status_change_nid = zone_to_nid(zone); | |
d9713679 LJ |
1771 | } |
1772 | ||
1773 | static void node_states_clear_node(int node, struct memory_notify *arg) | |
1774 | { | |
1775 | if (arg->status_change_nid_normal >= 0) | |
1776 | node_clear_state(node, N_NORMAL_MEMORY); | |
1777 | ||
cf01f6f5 | 1778 | if (arg->status_change_nid >= 0) |
6715ddf9 | 1779 | node_clear_state(node, N_MEMORY); |
d9713679 LJ |
1780 | } |
1781 | ||
c5e79ef5 DH |
1782 | static int count_system_ram_pages_cb(unsigned long start_pfn, |
1783 | unsigned long nr_pages, void *data) | |
1784 | { | |
1785 | unsigned long *nr_system_ram_pages = data; | |
1786 | ||
1787 | *nr_system_ram_pages += nr_pages; | |
1788 | return 0; | |
1789 | } | |
1790 | ||
836809ec | 1791 | int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages, |
395f6081 | 1792 | struct zone *zone, struct memory_group *group) |
0c0e6195 | 1793 | { |
73a11c96 | 1794 | const unsigned long end_pfn = start_pfn + nr_pages; |
0a1a9a00 | 1795 | unsigned long pfn, system_ram_pages = 0; |
395f6081 | 1796 | const int node = zone_to_nid(zone); |
d702909f | 1797 | unsigned long flags; |
7b78d335 | 1798 | struct memory_notify arg; |
79605093 | 1799 | char *reason; |
395f6081 | 1800 | int ret; |
0c0e6195 | 1801 | |
dd8e2f23 OS |
1802 | /* |
1803 | * {on,off}lining is constrained to full memory sections (or more | |
041711ce | 1804 | * precisely to memory blocks from the user space POV). |
dd8e2f23 OS |
1805 | * memmap_on_memory is an exception because it reserves initial part |
1806 | * of the physical memory space for vmemmaps. That space is pageblock | |
1807 | * aligned. | |
1808 | */ | |
4986fac1 | 1809 | if (WARN_ON_ONCE(!nr_pages || |
dd8e2f23 OS |
1810 | !IS_ALIGNED(start_pfn, pageblock_nr_pages) || |
1811 | !IS_ALIGNED(start_pfn + nr_pages, PAGES_PER_SECTION))) | |
4986fac1 DH |
1812 | return -EINVAL; |
1813 | ||
381eab4a DH |
1814 | mem_hotplug_begin(); |
1815 | ||
c5e79ef5 DH |
1816 | /* |
1817 | * Don't allow to offline memory blocks that contain holes. | |
1818 | * Consequently, memory blocks with holes can never get onlined | |
1819 | * via the hotplug path - online_pages() - as hotplugged memory has | |
1820 | * no holes. This way, we e.g., don't have to worry about marking | |
1821 | * memory holes PG_reserved, don't need pfn_valid() checks, and can | |
1822 | * avoid using walk_system_ram_range() later. | |
1823 | */ | |
73a11c96 | 1824 | walk_system_ram_range(start_pfn, nr_pages, &system_ram_pages, |
c5e79ef5 | 1825 | count_system_ram_pages_cb); |
73a11c96 | 1826 | if (system_ram_pages != nr_pages) { |
c5e79ef5 DH |
1827 | ret = -EINVAL; |
1828 | reason = "memory holes"; | |
1829 | goto failed_removal; | |
1830 | } | |
1831 | ||
395f6081 DH |
1832 | /* |
1833 | * We only support offlining of memory blocks managed by a single zone, | |
1834 | * checked by calling code. This is just a sanity check that we might | |
1835 | * want to remove in the future. | |
1836 | */ | |
1837 | if (WARN_ON_ONCE(page_zone(pfn_to_page(start_pfn)) != zone || | |
1838 | page_zone(pfn_to_page(end_pfn - 1)) != zone)) { | |
79605093 MH |
1839 | ret = -EINVAL; |
1840 | reason = "multizone range"; | |
1841 | goto failed_removal; | |
381eab4a | 1842 | } |
7b78d335 | 1843 | |
ec6e8c7e VB |
1844 | /* |
1845 | * Disable pcplists so that page isolation cannot race with freeing | |
1846 | * in a way that pages from isolated pageblock are left on pcplists. | |
1847 | */ | |
1848 | zone_pcp_disable(zone); | |
d479960e | 1849 | lru_cache_disable(); |
ec6e8c7e | 1850 | |
0c0e6195 | 1851 | /* set above range as isolated */ |
b023f468 | 1852 | ret = start_isolate_page_range(start_pfn, end_pfn, |
d381c547 | 1853 | MIGRATE_MOVABLE, |
b2c9e2fb ZY |
1854 | MEMORY_OFFLINE | REPORT_FAILURE, |
1855 | GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL); | |
3fa0c7c7 | 1856 | if (ret) { |
79605093 | 1857 | reason = "failure to isolate range"; |
ec6e8c7e | 1858 | goto failed_removal_pcplists_disabled; |
381eab4a | 1859 | } |
7b78d335 YG |
1860 | |
1861 | arg.start_pfn = start_pfn; | |
1862 | arg.nr_pages = nr_pages; | |
d9713679 | 1863 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1864 | |
1865 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1866 | ret = notifier_to_errno(ret); | |
79605093 MH |
1867 | if (ret) { |
1868 | reason = "notifier failure"; | |
1869 | goto failed_removal_isolated; | |
1870 | } | |
7b78d335 | 1871 | |
bb8965bd | 1872 | do { |
aa218795 DH |
1873 | pfn = start_pfn; |
1874 | do { | |
bb8965bd MH |
1875 | if (signal_pending(current)) { |
1876 | ret = -EINTR; | |
1877 | reason = "signal backoff"; | |
1878 | goto failed_removal_isolated; | |
1879 | } | |
72b39cfc | 1880 | |
bb8965bd | 1881 | cond_resched(); |
bb8965bd | 1882 | |
aa218795 DH |
1883 | ret = scan_movable_pages(pfn, end_pfn, &pfn); |
1884 | if (!ret) { | |
bb8965bd MH |
1885 | /* |
1886 | * TODO: fatal migration failures should bail | |
1887 | * out | |
1888 | */ | |
1889 | do_migrate_range(pfn, end_pfn); | |
1890 | } | |
aa218795 DH |
1891 | } while (!ret); |
1892 | ||
1893 | if (ret != -ENOENT) { | |
1894 | reason = "unmovable page"; | |
1895 | goto failed_removal_isolated; | |
bb8965bd | 1896 | } |
0c0e6195 | 1897 | |
bb8965bd MH |
1898 | /* |
1899 | * Dissolve free hugepages in the memory block before doing | |
1900 | * offlining actually in order to make hugetlbfs's object | |
1901 | * counting consistent. | |
1902 | */ | |
1903 | ret = dissolve_free_huge_pages(start_pfn, end_pfn); | |
1904 | if (ret) { | |
1905 | reason = "failure to dissolve huge pages"; | |
1906 | goto failed_removal_isolated; | |
1907 | } | |
0a1a9a00 | 1908 | |
0a1a9a00 | 1909 | ret = test_pages_isolated(start_pfn, end_pfn, MEMORY_OFFLINE); |
ec6e8c7e | 1910 | |
5557c766 | 1911 | } while (ret); |
72b39cfc | 1912 | |
0a1a9a00 DH |
1913 | /* Mark all sections offline and remove free pages from the buddy. */ |
1914 | __offline_isolated_pages(start_pfn, end_pfn); | |
7c33023a | 1915 | pr_debug("Offlined Pages %ld\n", nr_pages); |
0a1a9a00 | 1916 | |
9b7ea46a | 1917 | /* |
b30c5927 DH |
1918 | * The memory sections are marked offline, and the pageblock flags |
1919 | * effectively stale; nobody should be touching them. Fixup the number | |
1920 | * of isolated pageblocks, memory onlining will properly revert this. | |
9b7ea46a QC |
1921 | */ |
1922 | spin_lock_irqsave(&zone->lock, flags); | |
ea15153c | 1923 | zone->nr_isolate_pageblock -= nr_pages / pageblock_nr_pages; |
9b7ea46a QC |
1924 | spin_unlock_irqrestore(&zone->lock, flags); |
1925 | ||
d479960e | 1926 | lru_cache_enable(); |
ec6e8c7e VB |
1927 | zone_pcp_enable(zone); |
1928 | ||
0c0e6195 | 1929 | /* removal success */ |
0a1a9a00 | 1930 | adjust_managed_page_count(pfn_to_page(start_pfn), -nr_pages); |
836809ec | 1931 | adjust_present_page_count(pfn_to_page(start_pfn), group, -nr_pages); |
7b78d335 | 1932 | |
b92ca18e | 1933 | /* reinitialise watermarks and update pcp limits */ |
1b79acc9 KM |
1934 | init_per_zone_wmark_min(); |
1935 | ||
1e8537ba | 1936 | if (!populated_zone(zone)) { |
340175b7 | 1937 | zone_pcp_reset(zone); |
72675e13 | 1938 | build_all_zonelists(NULL); |
b92ca18e | 1939 | } |
340175b7 | 1940 | |
d9713679 | 1941 | node_states_clear_node(node, &arg); |
698b1b30 | 1942 | if (arg.status_change_nid >= 0) { |
8fe23e05 | 1943 | kswapd_stop(node); |
698b1b30 VB |
1944 | kcompactd_stop(node); |
1945 | } | |
bce7394a | 1946 | |
0c0e6195 | 1947 | writeback_set_ratelimit(); |
7b78d335 YG |
1948 | |
1949 | memory_notify(MEM_OFFLINE, &arg); | |
feee6b29 | 1950 | remove_pfn_range_from_zone(zone, start_pfn, nr_pages); |
381eab4a | 1951 | mem_hotplug_done(); |
0c0e6195 KH |
1952 | return 0; |
1953 | ||
79605093 | 1954 | failed_removal_isolated: |
36ba30bc | 1955 | /* pushback to free area */ |
79605093 | 1956 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
c4efe484 | 1957 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
ec6e8c7e | 1958 | failed_removal_pcplists_disabled: |
946746d1 | 1959 | lru_cache_enable(); |
ec6e8c7e | 1960 | zone_pcp_enable(zone); |
0c0e6195 | 1961 | failed_removal: |
79605093 | 1962 | pr_debug("memory offlining [mem %#010llx-%#010llx] failed due to %s\n", |
e33e33b4 | 1963 | (unsigned long long) start_pfn << PAGE_SHIFT, |
79605093 MH |
1964 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1, |
1965 | reason); | |
381eab4a | 1966 | mem_hotplug_done(); |
0c0e6195 KH |
1967 | return ret; |
1968 | } | |
71088785 | 1969 | |
d6de9d53 | 1970 | static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) |
bbc76be6 WC |
1971 | { |
1972 | int ret = !is_memblock_offlined(mem); | |
e1c158e4 | 1973 | int *nid = arg; |
bbc76be6 | 1974 | |
e1c158e4 | 1975 | *nid = mem->nid; |
349daa0f RD |
1976 | if (unlikely(ret)) { |
1977 | phys_addr_t beginpa, endpa; | |
1978 | ||
1979 | beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); | |
b6c88d3b | 1980 | endpa = beginpa + memory_block_size_bytes() - 1; |
756a025f | 1981 | pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n", |
349daa0f | 1982 | &beginpa, &endpa); |
bbc76be6 | 1983 | |
eca499ab PT |
1984 | return -EBUSY; |
1985 | } | |
1986 | return 0; | |
bbc76be6 WC |
1987 | } |
1988 | ||
a08a2ae3 OS |
1989 | static int get_nr_vmemmap_pages_cb(struct memory_block *mem, void *arg) |
1990 | { | |
1991 | /* | |
1992 | * If not set, continue with the next block. | |
1993 | */ | |
1994 | return mem->nr_vmemmap_pages; | |
1995 | } | |
1996 | ||
b27340a5 | 1997 | static int check_cpu_on_node(int nid) |
60a5a19e | 1998 | { |
60a5a19e TC |
1999 | int cpu; |
2000 | ||
2001 | for_each_present_cpu(cpu) { | |
b27340a5 | 2002 | if (cpu_to_node(cpu) == nid) |
60a5a19e TC |
2003 | /* |
2004 | * the cpu on this node isn't removed, and we can't | |
2005 | * offline this node. | |
2006 | */ | |
2007 | return -EBUSY; | |
2008 | } | |
2009 | ||
2010 | return 0; | |
2011 | } | |
2012 | ||
2c91f8fc DH |
2013 | static int check_no_memblock_for_node_cb(struct memory_block *mem, void *arg) |
2014 | { | |
2015 | int nid = *(int *)arg; | |
2016 | ||
2017 | /* | |
2018 | * If a memory block belongs to multiple nodes, the stored nid is not | |
2019 | * reliable. However, such blocks are always online (e.g., cannot get | |
2020 | * offlined) and, therefore, are still spanned by the node. | |
2021 | */ | |
2022 | return mem->nid == nid ? -EEXIST : 0; | |
2023 | } | |
2024 | ||
0f1cfe9d TK |
2025 | /** |
2026 | * try_offline_node | |
e8b098fc | 2027 | * @nid: the node ID |
0f1cfe9d TK |
2028 | * |
2029 | * Offline a node if all memory sections and cpus of the node are removed. | |
2030 | * | |
2031 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
2032 | * and online/offline operations before this call. | |
2033 | */ | |
90b30cdc | 2034 | void try_offline_node(int nid) |
60a5a19e | 2035 | { |
2c91f8fc | 2036 | int rc; |
60a5a19e | 2037 | |
2c91f8fc DH |
2038 | /* |
2039 | * If the node still spans pages (especially ZONE_DEVICE), don't | |
2040 | * offline it. A node spans memory after move_pfn_range_to_zone(), | |
2041 | * e.g., after the memory block was onlined. | |
2042 | */ | |
b27340a5 | 2043 | if (node_spanned_pages(nid)) |
2c91f8fc | 2044 | return; |
60a5a19e | 2045 | |
2c91f8fc DH |
2046 | /* |
2047 | * Especially offline memory blocks might not be spanned by the | |
2048 | * node. They will get spanned by the node once they get onlined. | |
2049 | * However, they link to the node in sysfs and can get onlined later. | |
2050 | */ | |
2051 | rc = for_each_memory_block(&nid, check_no_memblock_for_node_cb); | |
2052 | if (rc) | |
60a5a19e | 2053 | return; |
60a5a19e | 2054 | |
b27340a5 | 2055 | if (check_cpu_on_node(nid)) |
60a5a19e TC |
2056 | return; |
2057 | ||
2058 | /* | |
2059 | * all memory/cpu of this node are removed, we can offline this | |
2060 | * node now. | |
2061 | */ | |
2062 | node_set_offline(nid); | |
2063 | unregister_one_node(nid); | |
2064 | } | |
90b30cdc | 2065 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 2066 | |
e1c158e4 | 2067 | static int __ref try_remove_memory(u64 start, u64 size) |
bbc76be6 | 2068 | { |
a08a2ae3 OS |
2069 | struct vmem_altmap mhp_altmap = {}; |
2070 | struct vmem_altmap *altmap = NULL; | |
2071 | unsigned long nr_vmemmap_pages; | |
e1c158e4 | 2072 | int rc = 0, nid = NUMA_NO_NODE; |
993c1aad | 2073 | |
27356f54 TK |
2074 | BUG_ON(check_hotplug_memory_range(start, size)); |
2075 | ||
6677e3ea | 2076 | /* |
242831eb | 2077 | * All memory blocks must be offlined before removing memory. Check |
eca499ab | 2078 | * whether all memory blocks in question are offline and return error |
242831eb | 2079 | * if this is not the case. |
e1c158e4 DH |
2080 | * |
2081 | * While at it, determine the nid. Note that if we'd have mixed nodes, | |
2082 | * we'd only try to offline the last determined one -- which is good | |
2083 | * enough for the cases we care about. | |
6677e3ea | 2084 | */ |
e1c158e4 | 2085 | rc = walk_memory_blocks(start, size, &nid, check_memblock_offlined_cb); |
eca499ab | 2086 | if (rc) |
b4223a51 | 2087 | return rc; |
6677e3ea | 2088 | |
a08a2ae3 OS |
2089 | /* |
2090 | * We only support removing memory added with MHP_MEMMAP_ON_MEMORY in | |
2091 | * the same granularity it was added - a single memory block. | |
2092 | */ | |
6e02c46b | 2093 | if (mhp_memmap_on_memory()) { |
a08a2ae3 OS |
2094 | nr_vmemmap_pages = walk_memory_blocks(start, size, NULL, |
2095 | get_nr_vmemmap_pages_cb); | |
2096 | if (nr_vmemmap_pages) { | |
2097 | if (size != memory_block_size_bytes()) { | |
2098 | pr_warn("Refuse to remove %#llx - %#llx," | |
2099 | "wrong granularity\n", | |
2100 | start, start + size); | |
2101 | return -EINVAL; | |
2102 | } | |
2103 | ||
2104 | /* | |
2105 | * Let remove_pmd_table->free_hugepage_table do the | |
2106 | * right thing if we used vmem_altmap when hot-adding | |
2107 | * the range. | |
2108 | */ | |
2109 | mhp_altmap.alloc = nr_vmemmap_pages; | |
2110 | altmap = &mhp_altmap; | |
2111 | } | |
2112 | } | |
2113 | ||
46c66c4b YI |
2114 | /* remove memmap entry */ |
2115 | firmware_map_remove(start, start + size, "System RAM"); | |
4c4b7f9b | 2116 | |
f1037ec0 DW |
2117 | /* |
2118 | * Memory block device removal under the device_hotplug_lock is | |
2119 | * a barrier against racing online attempts. | |
2120 | */ | |
4c4b7f9b | 2121 | remove_memory_block_devices(start, size); |
46c66c4b | 2122 | |
f1037ec0 DW |
2123 | mem_hotplug_begin(); |
2124 | ||
65a2aa5f | 2125 | arch_remove_memory(start, size, altmap); |
52219aea DH |
2126 | |
2127 | if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) { | |
3ecc6834 | 2128 | memblock_phys_free(start, size); |
52219aea DH |
2129 | memblock_remove(start, size); |
2130 | } | |
2131 | ||
cb8e3c8b | 2132 | release_mem_region_adjustable(start, size); |
24d335ca | 2133 | |
e1c158e4 DH |
2134 | if (nid != NUMA_NO_NODE) |
2135 | try_offline_node(nid); | |
60a5a19e | 2136 | |
bfc8c901 | 2137 | mem_hotplug_done(); |
b4223a51 | 2138 | return 0; |
71088785 | 2139 | } |
d15e5926 | 2140 | |
eca499ab | 2141 | /** |
5640c9ca | 2142 | * __remove_memory - Remove memory if every memory block is offline |
eca499ab PT |
2143 | * @start: physical address of the region to remove |
2144 | * @size: size of the region to remove | |
2145 | * | |
2146 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
2147 | * and online/offline operations before this call, as required by | |
2148 | * try_offline_node(). | |
2149 | */ | |
e1c158e4 | 2150 | void __remove_memory(u64 start, u64 size) |
eca499ab PT |
2151 | { |
2152 | ||
2153 | /* | |
29a90db9 | 2154 | * trigger BUG() if some memory is not offlined prior to calling this |
eca499ab PT |
2155 | * function |
2156 | */ | |
e1c158e4 | 2157 | if (try_remove_memory(start, size)) |
eca499ab PT |
2158 | BUG(); |
2159 | } | |
2160 | ||
2161 | /* | |
2162 | * Remove memory if every memory block is offline, otherwise return -EBUSY is | |
2163 | * some memory is not offline | |
2164 | */ | |
e1c158e4 | 2165 | int remove_memory(u64 start, u64 size) |
d15e5926 | 2166 | { |
eca499ab PT |
2167 | int rc; |
2168 | ||
d15e5926 | 2169 | lock_device_hotplug(); |
e1c158e4 | 2170 | rc = try_remove_memory(start, size); |
d15e5926 | 2171 | unlock_device_hotplug(); |
eca499ab PT |
2172 | |
2173 | return rc; | |
d15e5926 | 2174 | } |
71088785 | 2175 | EXPORT_SYMBOL_GPL(remove_memory); |
08b3acd7 | 2176 | |
8dc4bb58 DH |
2177 | static int try_offline_memory_block(struct memory_block *mem, void *arg) |
2178 | { | |
2179 | uint8_t online_type = MMOP_ONLINE_KERNEL; | |
2180 | uint8_t **online_types = arg; | |
2181 | struct page *page; | |
2182 | int rc; | |
2183 | ||
2184 | /* | |
2185 | * Sense the online_type via the zone of the memory block. Offlining | |
2186 | * with multiple zones within one memory block will be rejected | |
2187 | * by offlining code ... so we don't care about that. | |
2188 | */ | |
2189 | page = pfn_to_online_page(section_nr_to_pfn(mem->start_section_nr)); | |
2190 | if (page && zone_idx(page_zone(page)) == ZONE_MOVABLE) | |
2191 | online_type = MMOP_ONLINE_MOVABLE; | |
2192 | ||
2193 | rc = device_offline(&mem->dev); | |
2194 | /* | |
2195 | * Default is MMOP_OFFLINE - change it only if offlining succeeded, | |
2196 | * so try_reonline_memory_block() can do the right thing. | |
2197 | */ | |
2198 | if (!rc) | |
2199 | **online_types = online_type; | |
2200 | ||
2201 | (*online_types)++; | |
2202 | /* Ignore if already offline. */ | |
2203 | return rc < 0 ? rc : 0; | |
2204 | } | |
2205 | ||
2206 | static int try_reonline_memory_block(struct memory_block *mem, void *arg) | |
2207 | { | |
2208 | uint8_t **online_types = arg; | |
2209 | int rc; | |
2210 | ||
2211 | if (**online_types != MMOP_OFFLINE) { | |
2212 | mem->online_type = **online_types; | |
2213 | rc = device_online(&mem->dev); | |
2214 | if (rc < 0) | |
2215 | pr_warn("%s: Failed to re-online memory: %d", | |
2216 | __func__, rc); | |
2217 | } | |
2218 | ||
2219 | /* Continue processing all remaining memory blocks. */ | |
2220 | (*online_types)++; | |
2221 | return 0; | |
2222 | } | |
2223 | ||
08b3acd7 | 2224 | /* |
8dc4bb58 DH |
2225 | * Try to offline and remove memory. Might take a long time to finish in case |
2226 | * memory is still in use. Primarily useful for memory devices that logically | |
2227 | * unplugged all memory (so it's no longer in use) and want to offline + remove | |
2228 | * that memory. | |
08b3acd7 | 2229 | */ |
e1c158e4 | 2230 | int offline_and_remove_memory(u64 start, u64 size) |
08b3acd7 | 2231 | { |
8dc4bb58 DH |
2232 | const unsigned long mb_count = size / memory_block_size_bytes(); |
2233 | uint8_t *online_types, *tmp; | |
2234 | int rc; | |
08b3acd7 DH |
2235 | |
2236 | if (!IS_ALIGNED(start, memory_block_size_bytes()) || | |
8dc4bb58 DH |
2237 | !IS_ALIGNED(size, memory_block_size_bytes()) || !size) |
2238 | return -EINVAL; | |
2239 | ||
2240 | /* | |
2241 | * We'll remember the old online type of each memory block, so we can | |
2242 | * try to revert whatever we did when offlining one memory block fails | |
2243 | * after offlining some others succeeded. | |
2244 | */ | |
2245 | online_types = kmalloc_array(mb_count, sizeof(*online_types), | |
2246 | GFP_KERNEL); | |
2247 | if (!online_types) | |
2248 | return -ENOMEM; | |
2249 | /* | |
2250 | * Initialize all states to MMOP_OFFLINE, so when we abort processing in | |
2251 | * try_offline_memory_block(), we'll skip all unprocessed blocks in | |
2252 | * try_reonline_memory_block(). | |
2253 | */ | |
2254 | memset(online_types, MMOP_OFFLINE, mb_count); | |
08b3acd7 DH |
2255 | |
2256 | lock_device_hotplug(); | |
8dc4bb58 DH |
2257 | |
2258 | tmp = online_types; | |
2259 | rc = walk_memory_blocks(start, size, &tmp, try_offline_memory_block); | |
08b3acd7 DH |
2260 | |
2261 | /* | |
8dc4bb58 | 2262 | * In case we succeeded to offline all memory, remove it. |
08b3acd7 DH |
2263 | * This cannot fail as it cannot get onlined in the meantime. |
2264 | */ | |
2265 | if (!rc) { | |
e1c158e4 | 2266 | rc = try_remove_memory(start, size); |
8dc4bb58 DH |
2267 | if (rc) |
2268 | pr_err("%s: Failed to remove memory: %d", __func__, rc); | |
2269 | } | |
2270 | ||
2271 | /* | |
2272 | * Rollback what we did. While memory onlining might theoretically fail | |
2273 | * (nacked by a notifier), it barely ever happens. | |
2274 | */ | |
2275 | if (rc) { | |
2276 | tmp = online_types; | |
2277 | walk_memory_blocks(start, size, &tmp, | |
2278 | try_reonline_memory_block); | |
08b3acd7 DH |
2279 | } |
2280 | unlock_device_hotplug(); | |
2281 | ||
8dc4bb58 | 2282 | kfree(online_types); |
08b3acd7 DH |
2283 | return rc; |
2284 | } | |
2285 | EXPORT_SYMBOL_GPL(offline_and_remove_memory); | |
aba6efc4 | 2286 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |