Commit | Line | Data |
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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 MS |
45 | #ifdef CONFIG_MHP_MEMMAP_ON_MEMORY |
46 | static int memmap_on_memory_set(const char *val, const struct kernel_param *kp) | |
47 | { | |
48 | if (hugetlb_optimize_vmemmap_enabled()) | |
49 | return 0; | |
50 | return param_set_bool(val, kp); | |
51 | } | |
52 | ||
53 | static const struct kernel_param_ops memmap_on_memory_ops = { | |
54 | .flags = KERNEL_PARAM_OPS_FL_NOARG, | |
55 | .set = memmap_on_memory_set, | |
56 | .get = param_get_bool, | |
57 | }; | |
e3a9d9fc OS |
58 | |
59 | /* | |
60 | * memory_hotplug.memmap_on_memory parameter | |
61 | */ | |
62 | static bool memmap_on_memory __ro_after_init; | |
6e02c46b | 63 | module_param_cb(memmap_on_memory, &memmap_on_memory_ops, &memmap_on_memory, 0444); |
e3a9d9fc | 64 | MODULE_PARM_DESC(memmap_on_memory, "Enable memmap on memory for memory hotplug"); |
6e02c46b | 65 | |
78f39084 | 66 | bool mhp_memmap_on_memory(void) |
6e02c46b MS |
67 | { |
68 | return memmap_on_memory; | |
69 | } | |
e3a9d9fc | 70 | #endif |
a08a2ae3 | 71 | |
e83a437f DH |
72 | enum { |
73 | ONLINE_POLICY_CONTIG_ZONES = 0, | |
74 | ONLINE_POLICY_AUTO_MOVABLE, | |
75 | }; | |
76 | ||
ac62554b | 77 | static const char * const online_policy_to_str[] = { |
e83a437f DH |
78 | [ONLINE_POLICY_CONTIG_ZONES] = "contig-zones", |
79 | [ONLINE_POLICY_AUTO_MOVABLE] = "auto-movable", | |
80 | }; | |
81 | ||
82 | static int set_online_policy(const char *val, const struct kernel_param *kp) | |
83 | { | |
84 | int ret = sysfs_match_string(online_policy_to_str, val); | |
85 | ||
86 | if (ret < 0) | |
87 | return ret; | |
88 | *((int *)kp->arg) = ret; | |
89 | return 0; | |
90 | } | |
91 | ||
92 | static int get_online_policy(char *buffer, const struct kernel_param *kp) | |
93 | { | |
94 | return sprintf(buffer, "%s\n", online_policy_to_str[*((int *)kp->arg)]); | |
95 | } | |
96 | ||
97 | /* | |
98 | * memory_hotplug.online_policy: configure online behavior when onlining without | |
99 | * specifying a zone (MMOP_ONLINE) | |
100 | * | |
101 | * "contig-zones": keep zone contiguous | |
102 | * "auto-movable": online memory to ZONE_MOVABLE if the configuration | |
103 | * (auto_movable_ratio, auto_movable_numa_aware) allows for it | |
104 | */ | |
105 | static int online_policy __read_mostly = ONLINE_POLICY_CONTIG_ZONES; | |
106 | static const struct kernel_param_ops online_policy_ops = { | |
107 | .set = set_online_policy, | |
108 | .get = get_online_policy, | |
109 | }; | |
110 | module_param_cb(online_policy, &online_policy_ops, &online_policy, 0644); | |
111 | MODULE_PARM_DESC(online_policy, | |
112 | "Set the online policy (\"contig-zones\", \"auto-movable\") " | |
113 | "Default: \"contig-zones\""); | |
114 | ||
115 | /* | |
116 | * memory_hotplug.auto_movable_ratio: specify maximum MOVABLE:KERNEL ratio | |
117 | * | |
118 | * The ratio represent an upper limit and the kernel might decide to not | |
119 | * online some memory to ZONE_MOVABLE -- e.g., because hotplugged KERNEL memory | |
120 | * doesn't allow for more MOVABLE memory. | |
121 | */ | |
122 | static unsigned int auto_movable_ratio __read_mostly = 301; | |
123 | module_param(auto_movable_ratio, uint, 0644); | |
124 | MODULE_PARM_DESC(auto_movable_ratio, | |
125 | "Set the maximum ratio of MOVABLE:KERNEL memory in the system " | |
126 | "in percent for \"auto-movable\" online policy. Default: 301"); | |
127 | ||
128 | /* | |
129 | * memory_hotplug.auto_movable_numa_aware: consider numa node stats | |
130 | */ | |
131 | #ifdef CONFIG_NUMA | |
132 | static bool auto_movable_numa_aware __read_mostly = true; | |
133 | module_param(auto_movable_numa_aware, bool, 0644); | |
134 | MODULE_PARM_DESC(auto_movable_numa_aware, | |
135 | "Consider numa node stats in addition to global stats in " | |
136 | "\"auto-movable\" online policy. Default: true"); | |
137 | #endif /* CONFIG_NUMA */ | |
138 | ||
9d0ad8ca DK |
139 | /* |
140 | * online_page_callback contains pointer to current page onlining function. | |
141 | * Initially it is generic_online_page(). If it is required it could be | |
142 | * changed by calling set_online_page_callback() for callback registration | |
143 | * and restore_online_page_callback() for generic callback restore. | |
144 | */ | |
145 | ||
9d0ad8ca | 146 | static online_page_callback_t online_page_callback = generic_online_page; |
bfc8c901 | 147 | static DEFINE_MUTEX(online_page_callback_lock); |
9d0ad8ca | 148 | |
3f906ba2 | 149 | DEFINE_STATIC_PERCPU_RWSEM(mem_hotplug_lock); |
bfc8c901 | 150 | |
3f906ba2 TG |
151 | void get_online_mems(void) |
152 | { | |
153 | percpu_down_read(&mem_hotplug_lock); | |
154 | } | |
bfc8c901 | 155 | |
3f906ba2 TG |
156 | void put_online_mems(void) |
157 | { | |
158 | percpu_up_read(&mem_hotplug_lock); | |
159 | } | |
bfc8c901 | 160 | |
4932381e MH |
161 | bool movable_node_enabled = false; |
162 | ||
8604d9e5 | 163 | #ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE |
1adf8b46 | 164 | int mhp_default_online_type = MMOP_OFFLINE; |
8604d9e5 | 165 | #else |
1adf8b46 | 166 | int mhp_default_online_type = MMOP_ONLINE; |
8604d9e5 | 167 | #endif |
31bc3858 | 168 | |
86dd995d VK |
169 | static int __init setup_memhp_default_state(char *str) |
170 | { | |
1adf8b46 | 171 | const int online_type = mhp_online_type_from_str(str); |
5f47adf7 DH |
172 | |
173 | if (online_type >= 0) | |
1adf8b46 | 174 | mhp_default_online_type = online_type; |
86dd995d VK |
175 | |
176 | return 1; | |
177 | } | |
178 | __setup("memhp_default_state=", setup_memhp_default_state); | |
179 | ||
30467e0b | 180 | void mem_hotplug_begin(void) |
20d6c96b | 181 | { |
3f906ba2 TG |
182 | cpus_read_lock(); |
183 | percpu_down_write(&mem_hotplug_lock); | |
20d6c96b KM |
184 | } |
185 | ||
30467e0b | 186 | void mem_hotplug_done(void) |
bfc8c901 | 187 | { |
3f906ba2 TG |
188 | percpu_up_write(&mem_hotplug_lock); |
189 | cpus_read_unlock(); | |
bfc8c901 | 190 | } |
20d6c96b | 191 | |
357b4da5 JG |
192 | u64 max_mem_size = U64_MAX; |
193 | ||
45e0b78b | 194 | /* add this memory to iomem resource */ |
7b7b2721 DH |
195 | static struct resource *register_memory_resource(u64 start, u64 size, |
196 | const char *resource_name) | |
45e0b78b | 197 | { |
2794129e DH |
198 | struct resource *res; |
199 | unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; | |
7b7b2721 DH |
200 | |
201 | if (strcmp(resource_name, "System RAM")) | |
7cf603d1 | 202 | flags |= IORESOURCE_SYSRAM_DRIVER_MANAGED; |
357b4da5 | 203 | |
bca3feaa AK |
204 | if (!mhp_range_allowed(start, size, true)) |
205 | return ERR_PTR(-E2BIG); | |
206 | ||
f3cd4c86 BH |
207 | /* |
208 | * Make sure value parsed from 'mem=' only restricts memory adding | |
209 | * while booting, so that memory hotplug won't be impacted. Please | |
210 | * refer to document of 'mem=' in kernel-parameters.txt for more | |
211 | * details. | |
212 | */ | |
213 | if (start + size > max_mem_size && system_state < SYSTEM_RUNNING) | |
357b4da5 JG |
214 | return ERR_PTR(-E2BIG); |
215 | ||
2794129e DH |
216 | /* |
217 | * Request ownership of the new memory range. This might be | |
218 | * a child of an existing resource that was present but | |
219 | * not marked as busy. | |
220 | */ | |
221 | res = __request_region(&iomem_resource, start, size, | |
222 | resource_name, flags); | |
223 | ||
224 | if (!res) { | |
225 | pr_debug("Unable to reserve System RAM region: %016llx->%016llx\n", | |
226 | start, start + size); | |
6f754ba4 | 227 | return ERR_PTR(-EEXIST); |
45e0b78b KM |
228 | } |
229 | return res; | |
230 | } | |
231 | ||
232 | static void release_memory_resource(struct resource *res) | |
233 | { | |
234 | if (!res) | |
235 | return; | |
236 | release_resource(res); | |
237 | kfree(res); | |
45e0b78b KM |
238 | } |
239 | ||
7ea62160 DW |
240 | static int check_pfn_span(unsigned long pfn, unsigned long nr_pages, |
241 | const char *reason) | |
242 | { | |
243 | /* | |
244 | * Disallow all operations smaller than a sub-section and only | |
245 | * allow operations smaller than a section for | |
246 | * SPARSEMEM_VMEMMAP. Note that check_hotplug_memory_range() | |
247 | * enforces a larger memory_block_size_bytes() granularity for | |
248 | * memory that will be marked online, so this check should only | |
249 | * fire for direct arch_{add,remove}_memory() users outside of | |
250 | * add_memory_resource(). | |
251 | */ | |
252 | unsigned long min_align; | |
253 | ||
254 | if (IS_ENABLED(CONFIG_SPARSEMEM_VMEMMAP)) | |
255 | min_align = PAGES_PER_SUBSECTION; | |
256 | else | |
257 | min_align = PAGES_PER_SECTION; | |
258 | if (!IS_ALIGNED(pfn, min_align) | |
259 | || !IS_ALIGNED(nr_pages, min_align)) { | |
260 | WARN(1, "Misaligned __%s_pages start: %#lx end: #%lx\n", | |
261 | reason, pfn, pfn + nr_pages - 1); | |
262 | return -EINVAL; | |
263 | } | |
264 | return 0; | |
265 | } | |
266 | ||
9f605f26 DW |
267 | /* |
268 | * Return page for the valid pfn only if the page is online. All pfn | |
269 | * walkers which rely on the fully initialized page->flags and others | |
270 | * should use this rather than pfn_valid && pfn_to_page | |
271 | */ | |
272 | struct page *pfn_to_online_page(unsigned long pfn) | |
273 | { | |
274 | unsigned long nr = pfn_to_section_nr(pfn); | |
1f90a347 | 275 | struct dev_pagemap *pgmap; |
9f9b02e5 DW |
276 | struct mem_section *ms; |
277 | ||
278 | if (nr >= NR_MEM_SECTIONS) | |
279 | return NULL; | |
280 | ||
281 | ms = __nr_to_section(nr); | |
282 | if (!online_section(ms)) | |
283 | return NULL; | |
284 | ||
285 | /* | |
286 | * Save some code text when online_section() + | |
287 | * pfn_section_valid() are sufficient. | |
288 | */ | |
289 | if (IS_ENABLED(CONFIG_HAVE_ARCH_PFN_VALID) && !pfn_valid(pfn)) | |
290 | return NULL; | |
291 | ||
292 | if (!pfn_section_valid(ms, pfn)) | |
293 | return NULL; | |
9f605f26 | 294 | |
1f90a347 DW |
295 | if (!online_device_section(ms)) |
296 | return pfn_to_page(pfn); | |
297 | ||
298 | /* | |
299 | * Slowpath: when ZONE_DEVICE collides with | |
300 | * ZONE_{NORMAL,MOVABLE} within the same section some pfns in | |
301 | * the section may be 'offline' but 'valid'. Only | |
302 | * get_dev_pagemap() can determine sub-section online status. | |
303 | */ | |
304 | pgmap = get_dev_pagemap(pfn, NULL); | |
305 | put_dev_pagemap(pgmap); | |
306 | ||
307 | /* The presence of a pgmap indicates ZONE_DEVICE offline pfn */ | |
308 | if (pgmap) | |
309 | return NULL; | |
310 | ||
9f9b02e5 | 311 | return pfn_to_page(pfn); |
9f605f26 DW |
312 | } |
313 | EXPORT_SYMBOL_GPL(pfn_to_online_page); | |
314 | ||
7ea62160 | 315 | int __ref __add_pages(int nid, unsigned long pfn, unsigned long nr_pages, |
f5637d3b | 316 | struct mhp_params *params) |
4edd7cef | 317 | { |
6cdd0b30 DH |
318 | const unsigned long end_pfn = pfn + nr_pages; |
319 | unsigned long cur_nr_pages; | |
9a845030 | 320 | int err; |
f5637d3b | 321 | struct vmem_altmap *altmap = params->altmap; |
4b94ffdc | 322 | |
6366238b | 323 | if (WARN_ON_ONCE(!pgprot_val(params->pgprot))) |
bfeb022f LG |
324 | return -EINVAL; |
325 | ||
bca3feaa | 326 | VM_BUG_ON(!mhp_range_allowed(PFN_PHYS(pfn), nr_pages * PAGE_SIZE, false)); |
dca4436d | 327 | |
4b94ffdc DW |
328 | if (altmap) { |
329 | /* | |
330 | * Validate altmap is within bounds of the total request | |
331 | */ | |
7ea62160 | 332 | if (altmap->base_pfn != pfn |
4b94ffdc DW |
333 | || vmem_altmap_offset(altmap) > nr_pages) { |
334 | pr_warn_once("memory add fail, invalid altmap\n"); | |
7ea62160 | 335 | return -EINVAL; |
4b94ffdc DW |
336 | } |
337 | altmap->alloc = 0; | |
338 | } | |
339 | ||
7ea62160 DW |
340 | err = check_pfn_span(pfn, nr_pages, "add"); |
341 | if (err) | |
342 | return err; | |
343 | ||
6cdd0b30 DH |
344 | for (; pfn < end_pfn; pfn += cur_nr_pages) { |
345 | /* Select all remaining pages up to the next section boundary */ | |
346 | cur_nr_pages = min(end_pfn - pfn, | |
347 | SECTION_ALIGN_UP(pfn + 1) - pfn); | |
e3246d8f JM |
348 | err = sparse_add_section(nid, pfn, cur_nr_pages, altmap, |
349 | params->pgmap); | |
ba72b4c8 DW |
350 | if (err) |
351 | break; | |
f64ac5e6 | 352 | cond_resched(); |
4edd7cef | 353 | } |
c435a390 | 354 | vmemmap_populate_print_last(); |
4edd7cef DR |
355 | return err; |
356 | } | |
4edd7cef | 357 | |
815121d2 | 358 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
d09b0137 | 359 | static unsigned long find_smallest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
360 | unsigned long start_pfn, |
361 | unsigned long end_pfn) | |
362 | { | |
49ba3c6b | 363 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SUBSECTION) { |
7ce700bf | 364 | if (unlikely(!pfn_to_online_page(start_pfn))) |
815121d2 YI |
365 | continue; |
366 | ||
367 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
368 | continue; | |
369 | ||
9b05158f | 370 | if (zone != page_zone(pfn_to_page(start_pfn))) |
815121d2 YI |
371 | continue; |
372 | ||
373 | return start_pfn; | |
374 | } | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
379 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
d09b0137 | 380 | static unsigned long find_biggest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
381 | unsigned long start_pfn, |
382 | unsigned long end_pfn) | |
383 | { | |
815121d2 YI |
384 | unsigned long pfn; |
385 | ||
386 | /* pfn is the end pfn of a memory section. */ | |
387 | pfn = end_pfn - 1; | |
49ba3c6b | 388 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SUBSECTION) { |
7ce700bf | 389 | if (unlikely(!pfn_to_online_page(pfn))) |
815121d2 YI |
390 | continue; |
391 | ||
392 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
393 | continue; | |
394 | ||
9b05158f | 395 | if (zone != page_zone(pfn_to_page(pfn))) |
815121d2 YI |
396 | continue; |
397 | ||
398 | return pfn; | |
399 | } | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
405 | unsigned long end_pfn) | |
406 | { | |
815121d2 | 407 | unsigned long pfn; |
815121d2 YI |
408 | int nid = zone_to_nid(zone); |
409 | ||
5d12071c | 410 | if (zone->zone_start_pfn == start_pfn) { |
815121d2 YI |
411 | /* |
412 | * If the section is smallest section in the zone, it need | |
413 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
414 | * In this case, we find second smallest valid mem_section | |
415 | * for shrinking zone. | |
416 | */ | |
417 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
5d12071c | 418 | zone_end_pfn(zone)); |
815121d2 | 419 | if (pfn) { |
5d12071c | 420 | zone->spanned_pages = zone_end_pfn(zone) - pfn; |
815121d2 | 421 | zone->zone_start_pfn = pfn; |
950b68d9 DH |
422 | } else { |
423 | zone->zone_start_pfn = 0; | |
424 | zone->spanned_pages = 0; | |
815121d2 | 425 | } |
5d12071c | 426 | } else if (zone_end_pfn(zone) == end_pfn) { |
815121d2 YI |
427 | /* |
428 | * If the section is biggest section in the zone, it need | |
429 | * shrink zone->spanned_pages. | |
430 | * In this case, we find second biggest valid mem_section for | |
431 | * shrinking zone. | |
432 | */ | |
5d12071c | 433 | pfn = find_biggest_section_pfn(nid, zone, zone->zone_start_pfn, |
815121d2 YI |
434 | start_pfn); |
435 | if (pfn) | |
5d12071c | 436 | zone->spanned_pages = pfn - zone->zone_start_pfn + 1; |
950b68d9 DH |
437 | else { |
438 | zone->zone_start_pfn = 0; | |
439 | zone->spanned_pages = 0; | |
440 | } | |
815121d2 | 441 | } |
815121d2 YI |
442 | } |
443 | ||
00d6c019 | 444 | static void update_pgdat_span(struct pglist_data *pgdat) |
815121d2 | 445 | { |
00d6c019 DH |
446 | unsigned long node_start_pfn = 0, node_end_pfn = 0; |
447 | struct zone *zone; | |
448 | ||
449 | for (zone = pgdat->node_zones; | |
450 | zone < pgdat->node_zones + MAX_NR_ZONES; zone++) { | |
6c922cf7 | 451 | unsigned long end_pfn = zone_end_pfn(zone); |
00d6c019 DH |
452 | |
453 | /* No need to lock the zones, they can't change. */ | |
656d5711 DH |
454 | if (!zone->spanned_pages) |
455 | continue; | |
456 | if (!node_end_pfn) { | |
457 | node_start_pfn = zone->zone_start_pfn; | |
6c922cf7 | 458 | node_end_pfn = end_pfn; |
656d5711 DH |
459 | continue; |
460 | } | |
461 | ||
6c922cf7 ML |
462 | if (end_pfn > node_end_pfn) |
463 | node_end_pfn = end_pfn; | |
00d6c019 DH |
464 | if (zone->zone_start_pfn < node_start_pfn) |
465 | node_start_pfn = zone->zone_start_pfn; | |
815121d2 YI |
466 | } |
467 | ||
00d6c019 DH |
468 | pgdat->node_start_pfn = node_start_pfn; |
469 | pgdat->node_spanned_pages = node_end_pfn - node_start_pfn; | |
815121d2 YI |
470 | } |
471 | ||
feee6b29 DH |
472 | void __ref remove_pfn_range_from_zone(struct zone *zone, |
473 | unsigned long start_pfn, | |
474 | unsigned long nr_pages) | |
815121d2 | 475 | { |
b7e3debd | 476 | const unsigned long end_pfn = start_pfn + nr_pages; |
815121d2 | 477 | struct pglist_data *pgdat = zone->zone_pgdat; |
27cacaad | 478 | unsigned long pfn, cur_nr_pages; |
815121d2 | 479 | |
d33695b1 | 480 | /* Poison struct pages because they are now uninitialized again. */ |
b7e3debd BW |
481 | for (pfn = start_pfn; pfn < end_pfn; pfn += cur_nr_pages) { |
482 | cond_resched(); | |
483 | ||
484 | /* Select all remaining pages up to the next section boundary */ | |
485 | cur_nr_pages = | |
486 | min(end_pfn - pfn, SECTION_ALIGN_UP(pfn + 1) - pfn); | |
487 | page_init_poison(pfn_to_page(pfn), | |
488 | sizeof(struct page) * cur_nr_pages); | |
489 | } | |
d33695b1 | 490 | |
7ce700bf DH |
491 | /* |
492 | * Zone shrinking code cannot properly deal with ZONE_DEVICE. So | |
493 | * we will not try to shrink the zones - which is okay as | |
494 | * set_zone_contiguous() cannot deal with ZONE_DEVICE either way. | |
495 | */ | |
5ef5f810 | 496 | if (zone_is_zone_device(zone)) |
7ce700bf | 497 | return; |
7ce700bf | 498 | |
feee6b29 DH |
499 | clear_zone_contiguous(zone); |
500 | ||
815121d2 | 501 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); |
00d6c019 | 502 | update_pgdat_span(pgdat); |
feee6b29 DH |
503 | |
504 | set_zone_contiguous(zone); | |
815121d2 YI |
505 | } |
506 | ||
feee6b29 DH |
507 | static void __remove_section(unsigned long pfn, unsigned long nr_pages, |
508 | unsigned long map_offset, | |
509 | struct vmem_altmap *altmap) | |
ea01ea93 | 510 | { |
10404901 | 511 | struct mem_section *ms = __pfn_to_section(pfn); |
ea01ea93 | 512 | |
9d1d887d DH |
513 | if (WARN_ON_ONCE(!valid_section(ms))) |
514 | return; | |
ea01ea93 | 515 | |
ba72b4c8 | 516 | sparse_remove_section(ms, pfn, nr_pages, map_offset, altmap); |
ea01ea93 BP |
517 | } |
518 | ||
ea01ea93 | 519 | /** |
feee6b29 | 520 | * __remove_pages() - remove sections of pages |
7ea62160 | 521 | * @pfn: starting pageframe (must be aligned to start of a section) |
ea01ea93 | 522 | * @nr_pages: number of pages to remove (must be multiple of section size) |
e8b098fc | 523 | * @altmap: alternative device page map or %NULL if default memmap is used |
ea01ea93 BP |
524 | * |
525 | * Generic helper function to remove section mappings and sysfs entries | |
526 | * for the section of the memory we are removing. Caller needs to make | |
527 | * sure that pages are marked reserved and zones are adjust properly by | |
528 | * calling offline_pages(). | |
529 | */ | |
feee6b29 DH |
530 | void __remove_pages(unsigned long pfn, unsigned long nr_pages, |
531 | struct vmem_altmap *altmap) | |
ea01ea93 | 532 | { |
52fb87c8 DH |
533 | const unsigned long end_pfn = pfn + nr_pages; |
534 | unsigned long cur_nr_pages; | |
4b94ffdc | 535 | unsigned long map_offset = 0; |
4b94ffdc | 536 | |
96da4350 | 537 | map_offset = vmem_altmap_offset(altmap); |
ea01ea93 | 538 | |
7ea62160 DW |
539 | if (check_pfn_span(pfn, nr_pages, "remove")) |
540 | return; | |
ea01ea93 | 541 | |
52fb87c8 | 542 | for (; pfn < end_pfn; pfn += cur_nr_pages) { |
dd33ad7b | 543 | cond_resched(); |
52fb87c8 | 544 | /* Select all remaining pages up to the next section boundary */ |
a11b9419 DH |
545 | cur_nr_pages = min(end_pfn - pfn, |
546 | SECTION_ALIGN_UP(pfn + 1) - pfn); | |
52fb87c8 | 547 | __remove_section(pfn, cur_nr_pages, map_offset, altmap); |
4b94ffdc | 548 | map_offset = 0; |
ea01ea93 | 549 | } |
ea01ea93 | 550 | } |
ea01ea93 | 551 | |
9d0ad8ca DK |
552 | int set_online_page_callback(online_page_callback_t callback) |
553 | { | |
554 | int rc = -EINVAL; | |
555 | ||
bfc8c901 VD |
556 | get_online_mems(); |
557 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
558 | |
559 | if (online_page_callback == generic_online_page) { | |
560 | online_page_callback = callback; | |
561 | rc = 0; | |
562 | } | |
563 | ||
bfc8c901 VD |
564 | mutex_unlock(&online_page_callback_lock); |
565 | put_online_mems(); | |
9d0ad8ca DK |
566 | |
567 | return rc; | |
568 | } | |
569 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
570 | ||
571 | int restore_online_page_callback(online_page_callback_t callback) | |
572 | { | |
573 | int rc = -EINVAL; | |
574 | ||
bfc8c901 VD |
575 | get_online_mems(); |
576 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
577 | |
578 | if (online_page_callback == callback) { | |
579 | online_page_callback = generic_online_page; | |
580 | rc = 0; | |
581 | } | |
582 | ||
bfc8c901 VD |
583 | mutex_unlock(&online_page_callback_lock); |
584 | put_online_mems(); | |
9d0ad8ca DK |
585 | |
586 | return rc; | |
587 | } | |
588 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
589 | ||
18db1491 | 590 | void generic_online_page(struct page *page, unsigned int order) |
9d0ad8ca | 591 | { |
c87cbc1f VB |
592 | /* |
593 | * Freeing the page with debug_pagealloc enabled will try to unmap it, | |
594 | * so we should map it first. This is better than introducing a special | |
595 | * case in page freeing fast path. | |
596 | */ | |
77bc7fd6 | 597 | debug_pagealloc_map_pages(page, 1 << order); |
a9cd410a AK |
598 | __free_pages_core(page, order); |
599 | totalram_pages_add(1UL << order); | |
a9cd410a | 600 | } |
18db1491 | 601 | EXPORT_SYMBOL_GPL(generic_online_page); |
a9cd410a | 602 | |
aac65321 | 603 | static void online_pages_range(unsigned long start_pfn, unsigned long nr_pages) |
3947be19 | 604 | { |
b2c2ab20 DH |
605 | const unsigned long end_pfn = start_pfn + nr_pages; |
606 | unsigned long pfn; | |
b2c2ab20 DH |
607 | |
608 | /* | |
aac65321 DH |
609 | * Online the pages in MAX_ORDER - 1 aligned chunks. The callback might |
610 | * decide to not expose all pages to the buddy (e.g., expose them | |
611 | * later). We account all pages as being online and belonging to this | |
612 | * zone ("present"). | |
a08a2ae3 OS |
613 | * When using memmap_on_memory, the range might not be aligned to |
614 | * MAX_ORDER_NR_PAGES - 1, but pageblock aligned. __ffs() will detect | |
615 | * this and the first chunk to online will be pageblock_nr_pages. | |
b2c2ab20 | 616 | */ |
a08a2ae3 OS |
617 | for (pfn = start_pfn; pfn < end_pfn;) { |
618 | int order = min(MAX_ORDER - 1UL, __ffs(pfn)); | |
619 | ||
620 | (*online_page_callback)(pfn_to_page(pfn), order); | |
621 | pfn += (1UL << order); | |
622 | } | |
2d070eab | 623 | |
b2c2ab20 DH |
624 | /* mark all involved sections as online */ |
625 | online_mem_sections(start_pfn, end_pfn); | |
75884fb1 KH |
626 | } |
627 | ||
d9713679 LJ |
628 | /* check which state of node_states will be changed when online memory */ |
629 | static void node_states_check_changes_online(unsigned long nr_pages, | |
630 | struct zone *zone, struct memory_notify *arg) | |
631 | { | |
632 | int nid = zone_to_nid(zone); | |
d9713679 | 633 | |
98fa15f3 AK |
634 | arg->status_change_nid = NUMA_NO_NODE; |
635 | arg->status_change_nid_normal = NUMA_NO_NODE; | |
d9713679 | 636 | |
8efe33f4 OS |
637 | if (!node_state(nid, N_MEMORY)) |
638 | arg->status_change_nid = nid; | |
639 | if (zone_idx(zone) <= ZONE_NORMAL && !node_state(nid, N_NORMAL_MEMORY)) | |
d9713679 | 640 | arg->status_change_nid_normal = nid; |
d9713679 LJ |
641 | } |
642 | ||
643 | static void node_states_set_node(int node, struct memory_notify *arg) | |
644 | { | |
645 | if (arg->status_change_nid_normal >= 0) | |
646 | node_set_state(node, N_NORMAL_MEMORY); | |
647 | ||
83d83612 OS |
648 | if (arg->status_change_nid >= 0) |
649 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
650 | } |
651 | ||
f1dd2cd1 MH |
652 | static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, |
653 | unsigned long nr_pages) | |
654 | { | |
655 | unsigned long old_end_pfn = zone_end_pfn(zone); | |
656 | ||
657 | if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) | |
658 | zone->zone_start_pfn = start_pfn; | |
659 | ||
660 | zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn; | |
661 | } | |
662 | ||
663 | static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned long start_pfn, | |
664 | unsigned long nr_pages) | |
665 | { | |
666 | unsigned long old_end_pfn = pgdat_end_pfn(pgdat); | |
667 | ||
668 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) | |
669 | pgdat->node_start_pfn = start_pfn; | |
670 | ||
671 | pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn; | |
f1dd2cd1 | 672 | |
3fccb74c | 673 | } |
1f90a347 DW |
674 | |
675 | static void section_taint_zone_device(unsigned long pfn) | |
676 | { | |
677 | struct mem_section *ms = __pfn_to_section(pfn); | |
678 | ||
679 | ms->section_mem_map |= SECTION_TAINT_ZONE_DEVICE; | |
680 | } | |
681 | ||
3fccb74c DH |
682 | /* |
683 | * Associate the pfn range with the given zone, initializing the memmaps | |
684 | * and resizing the pgdat/zone data to span the added pages. After this | |
685 | * call, all affected pages are PG_reserved. | |
d882c006 DH |
686 | * |
687 | * All aligned pageblocks are initialized to the specified migratetype | |
688 | * (usually MIGRATE_MOVABLE). Besides setting the migratetype, no related | |
689 | * zone stats (e.g., nr_isolate_pageblock) are touched. | |
3fccb74c | 690 | */ |
a99583e7 | 691 | void __ref move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, |
d882c006 DH |
692 | unsigned long nr_pages, |
693 | struct vmem_altmap *altmap, int migratetype) | |
f1dd2cd1 MH |
694 | { |
695 | struct pglist_data *pgdat = zone->zone_pgdat; | |
696 | int nid = pgdat->node_id; | |
df429ac0 | 697 | |
f1dd2cd1 MH |
698 | clear_zone_contiguous(zone); |
699 | ||
fa004ab7 WY |
700 | if (zone_is_empty(zone)) |
701 | init_currently_empty_zone(zone, start_pfn, nr_pages); | |
f1dd2cd1 | 702 | resize_zone_range(zone, start_pfn, nr_pages); |
f1dd2cd1 | 703 | resize_pgdat_range(pgdat, start_pfn, nr_pages); |
f1dd2cd1 | 704 | |
1f90a347 DW |
705 | /* |
706 | * Subsection population requires care in pfn_to_online_page(). | |
707 | * Set the taint to enable the slow path detection of | |
708 | * ZONE_DEVICE pages in an otherwise ZONE_{NORMAL,MOVABLE} | |
709 | * section. | |
710 | */ | |
711 | if (zone_is_zone_device(zone)) { | |
712 | if (!IS_ALIGNED(start_pfn, PAGES_PER_SECTION)) | |
713 | section_taint_zone_device(start_pfn); | |
714 | if (!IS_ALIGNED(start_pfn + nr_pages, PAGES_PER_SECTION)) | |
715 | section_taint_zone_device(start_pfn + nr_pages); | |
716 | } | |
717 | ||
f1dd2cd1 MH |
718 | /* |
719 | * TODO now we have a visible range of pages which are not associated | |
720 | * with their zone properly. Not nice but set_pfnblock_flags_mask | |
721 | * expects the zone spans the pfn range. All the pages in the range | |
722 | * are reserved so nobody should be touching them so we should be safe | |
723 | */ | |
ab28cb6e | 724 | memmap_init_range(nr_pages, nid, zone_idx(zone), start_pfn, 0, |
d882c006 | 725 | MEMINIT_HOTPLUG, altmap, migratetype); |
f1dd2cd1 MH |
726 | |
727 | set_zone_contiguous(zone); | |
728 | } | |
729 | ||
e83a437f DH |
730 | struct auto_movable_stats { |
731 | unsigned long kernel_early_pages; | |
732 | unsigned long movable_pages; | |
733 | }; | |
734 | ||
735 | static void auto_movable_stats_account_zone(struct auto_movable_stats *stats, | |
736 | struct zone *zone) | |
737 | { | |
738 | if (zone_idx(zone) == ZONE_MOVABLE) { | |
739 | stats->movable_pages += zone->present_pages; | |
740 | } else { | |
741 | stats->kernel_early_pages += zone->present_early_pages; | |
742 | #ifdef CONFIG_CMA | |
743 | /* | |
744 | * CMA pages (never on hotplugged memory) behave like | |
745 | * ZONE_MOVABLE. | |
746 | */ | |
747 | stats->movable_pages += zone->cma_pages; | |
748 | stats->kernel_early_pages -= zone->cma_pages; | |
749 | #endif /* CONFIG_CMA */ | |
750 | } | |
751 | } | |
3fcebf90 DH |
752 | struct auto_movable_group_stats { |
753 | unsigned long movable_pages; | |
754 | unsigned long req_kernel_early_pages; | |
755 | }; | |
e83a437f | 756 | |
3fcebf90 DH |
757 | static int auto_movable_stats_account_group(struct memory_group *group, |
758 | void *arg) | |
759 | { | |
760 | const int ratio = READ_ONCE(auto_movable_ratio); | |
761 | struct auto_movable_group_stats *stats = arg; | |
762 | long pages; | |
763 | ||
764 | /* | |
765 | * We don't support modifying the config while the auto-movable online | |
766 | * policy is already enabled. Just avoid the division by zero below. | |
767 | */ | |
768 | if (!ratio) | |
769 | return 0; | |
770 | ||
771 | /* | |
772 | * Calculate how many early kernel pages this group requires to | |
773 | * satisfy the configured zone ratio. | |
774 | */ | |
775 | pages = group->present_movable_pages * 100 / ratio; | |
776 | pages -= group->present_kernel_pages; | |
777 | ||
778 | if (pages > 0) | |
779 | stats->req_kernel_early_pages += pages; | |
780 | stats->movable_pages += group->present_movable_pages; | |
781 | return 0; | |
782 | } | |
783 | ||
784 | static bool auto_movable_can_online_movable(int nid, struct memory_group *group, | |
785 | unsigned long nr_pages) | |
e83a437f | 786 | { |
e83a437f | 787 | unsigned long kernel_early_pages, movable_pages; |
3fcebf90 DH |
788 | struct auto_movable_group_stats group_stats = {}; |
789 | struct auto_movable_stats stats = {}; | |
e83a437f DH |
790 | pg_data_t *pgdat = NODE_DATA(nid); |
791 | struct zone *zone; | |
792 | int i; | |
793 | ||
794 | /* Walk all relevant zones and collect MOVABLE vs. KERNEL stats. */ | |
795 | if (nid == NUMA_NO_NODE) { | |
796 | /* TODO: cache values */ | |
797 | for_each_populated_zone(zone) | |
798 | auto_movable_stats_account_zone(&stats, zone); | |
799 | } else { | |
800 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
801 | zone = pgdat->node_zones + i; | |
802 | if (populated_zone(zone)) | |
803 | auto_movable_stats_account_zone(&stats, zone); | |
804 | } | |
805 | } | |
806 | ||
807 | kernel_early_pages = stats.kernel_early_pages; | |
808 | movable_pages = stats.movable_pages; | |
809 | ||
3fcebf90 DH |
810 | /* |
811 | * Kernel memory inside dynamic memory group allows for more MOVABLE | |
812 | * memory within the same group. Remove the effect of all but the | |
813 | * current group from the stats. | |
814 | */ | |
815 | walk_dynamic_memory_groups(nid, auto_movable_stats_account_group, | |
816 | group, &group_stats); | |
817 | if (kernel_early_pages <= group_stats.req_kernel_early_pages) | |
818 | return false; | |
819 | kernel_early_pages -= group_stats.req_kernel_early_pages; | |
820 | movable_pages -= group_stats.movable_pages; | |
821 | ||
822 | if (group && group->is_dynamic) | |
823 | kernel_early_pages += group->present_kernel_pages; | |
824 | ||
e83a437f DH |
825 | /* |
826 | * Test if we could online the given number of pages to ZONE_MOVABLE | |
827 | * and still stay in the configured ratio. | |
828 | */ | |
829 | movable_pages += nr_pages; | |
830 | return movable_pages <= (auto_movable_ratio * kernel_early_pages) / 100; | |
831 | } | |
832 | ||
c246a213 MH |
833 | /* |
834 | * Returns a default kernel memory zone for the given pfn range. | |
835 | * If no kernel zone covers this pfn range it will automatically go | |
836 | * to the ZONE_NORMAL. | |
837 | */ | |
c6f03e29 | 838 | static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn, |
c246a213 MH |
839 | unsigned long nr_pages) |
840 | { | |
841 | struct pglist_data *pgdat = NODE_DATA(nid); | |
842 | int zid; | |
843 | ||
d6aad201 | 844 | for (zid = 0; zid < ZONE_NORMAL; zid++) { |
c246a213 MH |
845 | struct zone *zone = &pgdat->node_zones[zid]; |
846 | ||
847 | if (zone_intersects(zone, start_pfn, nr_pages)) | |
848 | return zone; | |
849 | } | |
850 | ||
851 | return &pgdat->node_zones[ZONE_NORMAL]; | |
852 | } | |
853 | ||
e83a437f DH |
854 | /* |
855 | * Determine to which zone to online memory dynamically based on user | |
856 | * configuration and system stats. We care about the following ratio: | |
857 | * | |
858 | * MOVABLE : KERNEL | |
859 | * | |
860 | * Whereby MOVABLE is memory in ZONE_MOVABLE and KERNEL is memory in | |
861 | * one of the kernel zones. CMA pages inside one of the kernel zones really | |
862 | * behaves like ZONE_MOVABLE, so we treat them accordingly. | |
863 | * | |
864 | * We don't allow for hotplugged memory in a KERNEL zone to increase the | |
865 | * amount of MOVABLE memory we can have, so we end up with: | |
866 | * | |
867 | * MOVABLE : KERNEL_EARLY | |
868 | * | |
869 | * Whereby KERNEL_EARLY is memory in one of the kernel zones, available sinze | |
870 | * boot. We base our calculation on KERNEL_EARLY internally, because: | |
871 | * | |
872 | * a) Hotplugged memory in one of the kernel zones can sometimes still get | |
873 | * hotunplugged, especially when hot(un)plugging individual memory blocks. | |
874 | * There is no coordination across memory devices, therefore "automatic" | |
875 | * hotunplugging, as implemented in hypervisors, could result in zone | |
876 | * imbalances. | |
877 | * b) Early/boot memory in one of the kernel zones can usually not get | |
878 | * hotunplugged again (e.g., no firmware interface to unplug, fragmented | |
879 | * with unmovable allocations). While there are corner cases where it might | |
880 | * still work, it is barely relevant in practice. | |
881 | * | |
3fcebf90 DH |
882 | * Exceptions are dynamic memory groups, which allow for more MOVABLE |
883 | * memory within the same memory group -- because in that case, there is | |
884 | * coordination within the single memory device managed by a single driver. | |
885 | * | |
e83a437f DH |
886 | * We rely on "present pages" instead of "managed pages", as the latter is |
887 | * highly unreliable and dynamic in virtualized environments, and does not | |
888 | * consider boot time allocations. For example, memory ballooning adjusts the | |
889 | * managed pages when inflating/deflating the balloon, and balloon compaction | |
890 | * can even migrate inflated pages between zones. | |
891 | * | |
892 | * Using "present pages" is better but some things to keep in mind are: | |
893 | * | |
894 | * a) Some memblock allocations, such as for the crashkernel area, are | |
895 | * effectively unused by the kernel, yet they account to "present pages". | |
896 | * Fortunately, these allocations are comparatively small in relevant setups | |
897 | * (e.g., fraction of system memory). | |
898 | * b) Some hotplugged memory blocks in virtualized environments, esecially | |
899 | * hotplugged by virtio-mem, look like they are completely present, however, | |
900 | * only parts of the memory block are actually currently usable. | |
901 | * "present pages" is an upper limit that can get reached at runtime. As | |
902 | * we base our calculations on KERNEL_EARLY, this is not an issue. | |
903 | */ | |
445fcf7c DH |
904 | static struct zone *auto_movable_zone_for_pfn(int nid, |
905 | struct memory_group *group, | |
906 | unsigned long pfn, | |
e83a437f DH |
907 | unsigned long nr_pages) |
908 | { | |
445fcf7c DH |
909 | unsigned long online_pages = 0, max_pages, end_pfn; |
910 | struct page *page; | |
911 | ||
e83a437f DH |
912 | if (!auto_movable_ratio) |
913 | goto kernel_zone; | |
914 | ||
445fcf7c DH |
915 | if (group && !group->is_dynamic) { |
916 | max_pages = group->s.max_pages; | |
917 | online_pages = group->present_movable_pages; | |
918 | ||
919 | /* If anything is !MOVABLE online the rest !MOVABLE. */ | |
920 | if (group->present_kernel_pages) | |
921 | goto kernel_zone; | |
922 | } else if (!group || group->d.unit_pages == nr_pages) { | |
923 | max_pages = nr_pages; | |
924 | } else { | |
925 | max_pages = group->d.unit_pages; | |
926 | /* | |
927 | * Take a look at all online sections in the current unit. | |
928 | * We can safely assume that all pages within a section belong | |
929 | * to the same zone, because dynamic memory groups only deal | |
930 | * with hotplugged memory. | |
931 | */ | |
932 | pfn = ALIGN_DOWN(pfn, group->d.unit_pages); | |
933 | end_pfn = pfn + group->d.unit_pages; | |
934 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
935 | page = pfn_to_online_page(pfn); | |
936 | if (!page) | |
937 | continue; | |
938 | /* If anything is !MOVABLE online the rest !MOVABLE. */ | |
939 | if (page_zonenum(page) != ZONE_MOVABLE) | |
940 | goto kernel_zone; | |
941 | online_pages += PAGES_PER_SECTION; | |
942 | } | |
943 | } | |
944 | ||
945 | /* | |
946 | * Online MOVABLE if we could *currently* online all remaining parts | |
947 | * MOVABLE. We expect to (add+) online them immediately next, so if | |
948 | * nobody interferes, all will be MOVABLE if possible. | |
949 | */ | |
950 | nr_pages = max_pages - online_pages; | |
3fcebf90 | 951 | if (!auto_movable_can_online_movable(NUMA_NO_NODE, group, nr_pages)) |
e83a437f DH |
952 | goto kernel_zone; |
953 | ||
954 | #ifdef CONFIG_NUMA | |
955 | if (auto_movable_numa_aware && | |
3fcebf90 | 956 | !auto_movable_can_online_movable(nid, group, nr_pages)) |
e83a437f DH |
957 | goto kernel_zone; |
958 | #endif /* CONFIG_NUMA */ | |
959 | ||
960 | return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
961 | kernel_zone: | |
962 | return default_kernel_zone_for_pfn(nid, pfn, nr_pages); | |
963 | } | |
964 | ||
c6f03e29 MH |
965 | static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, |
966 | unsigned long nr_pages) | |
e5e68930 | 967 | { |
c6f03e29 MH |
968 | struct zone *kernel_zone = default_kernel_zone_for_pfn(nid, start_pfn, |
969 | nr_pages); | |
970 | struct zone *movable_zone = &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
971 | bool in_kernel = zone_intersects(kernel_zone, start_pfn, nr_pages); | |
972 | bool in_movable = zone_intersects(movable_zone, start_pfn, nr_pages); | |
e5e68930 MH |
973 | |
974 | /* | |
c6f03e29 MH |
975 | * We inherit the existing zone in a simple case where zones do not |
976 | * overlap in the given range | |
e5e68930 | 977 | */ |
c6f03e29 MH |
978 | if (in_kernel ^ in_movable) |
979 | return (in_kernel) ? kernel_zone : movable_zone; | |
9f123ab5 | 980 | |
c6f03e29 MH |
981 | /* |
982 | * If the range doesn't belong to any zone or two zones overlap in the | |
983 | * given range then we use movable zone only if movable_node is | |
984 | * enabled because we always online to a kernel zone by default. | |
985 | */ | |
986 | return movable_node_enabled ? movable_zone : kernel_zone; | |
9f123ab5 MH |
987 | } |
988 | ||
7cf209ba | 989 | struct zone *zone_for_pfn_range(int online_type, int nid, |
445fcf7c | 990 | struct memory_group *group, unsigned long start_pfn, |
e5e68930 | 991 | unsigned long nr_pages) |
f1dd2cd1 | 992 | { |
c6f03e29 MH |
993 | if (online_type == MMOP_ONLINE_KERNEL) |
994 | return default_kernel_zone_for_pfn(nid, start_pfn, nr_pages); | |
f1dd2cd1 | 995 | |
c6f03e29 MH |
996 | if (online_type == MMOP_ONLINE_MOVABLE) |
997 | return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
df429ac0 | 998 | |
e83a437f | 999 | if (online_policy == ONLINE_POLICY_AUTO_MOVABLE) |
445fcf7c | 1000 | return auto_movable_zone_for_pfn(nid, group, start_pfn, nr_pages); |
e83a437f | 1001 | |
c6f03e29 | 1002 | return default_zone_for_pfn(nid, start_pfn, nr_pages); |
e5e68930 MH |
1003 | } |
1004 | ||
a08a2ae3 OS |
1005 | /* |
1006 | * This function should only be called by memory_block_{online,offline}, | |
1007 | * and {online,offline}_pages. | |
1008 | */ | |
836809ec DH |
1009 | void adjust_present_page_count(struct page *page, struct memory_group *group, |
1010 | long nr_pages) | |
f9901144 | 1011 | { |
4b097002 | 1012 | struct zone *zone = page_zone(page); |
836809ec | 1013 | const bool movable = zone_idx(zone) == ZONE_MOVABLE; |
4b097002 DH |
1014 | |
1015 | /* | |
1016 | * We only support onlining/offlining/adding/removing of complete | |
1017 | * memory blocks; therefore, either all is either early or hotplugged. | |
1018 | */ | |
1019 | if (early_section(__pfn_to_section(page_to_pfn(page)))) | |
1020 | zone->present_early_pages += nr_pages; | |
f9901144 | 1021 | zone->present_pages += nr_pages; |
f9901144 | 1022 | zone->zone_pgdat->node_present_pages += nr_pages; |
836809ec DH |
1023 | |
1024 | if (group && movable) | |
1025 | group->present_movable_pages += nr_pages; | |
1026 | else if (group && !movable) | |
1027 | group->present_kernel_pages += nr_pages; | |
f9901144 DH |
1028 | } |
1029 | ||
a08a2ae3 OS |
1030 | int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages, |
1031 | struct zone *zone) | |
1032 | { | |
1033 | unsigned long end_pfn = pfn + nr_pages; | |
1034 | int ret; | |
1035 | ||
1036 | ret = kasan_add_zero_shadow(__va(PFN_PHYS(pfn)), PFN_PHYS(nr_pages)); | |
1037 | if (ret) | |
1038 | return ret; | |
1039 | ||
1040 | move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_UNMOVABLE); | |
1041 | ||
1042 | /* | |
1043 | * It might be that the vmemmap_pages fully span sections. If that is | |
1044 | * the case, mark those sections online here as otherwise they will be | |
1045 | * left offline. | |
1046 | */ | |
1047 | if (nr_pages >= PAGES_PER_SECTION) | |
1048 | online_mem_sections(pfn, ALIGN_DOWN(end_pfn, PAGES_PER_SECTION)); | |
1049 | ||
1050 | return ret; | |
1051 | } | |
1052 | ||
1053 | void mhp_deinit_memmap_on_memory(unsigned long pfn, unsigned long nr_pages) | |
1054 | { | |
1055 | unsigned long end_pfn = pfn + nr_pages; | |
1056 | ||
1057 | /* | |
1058 | * It might be that the vmemmap_pages fully span sections. If that is | |
1059 | * the case, mark those sections offline here as otherwise they will be | |
1060 | * left online. | |
1061 | */ | |
1062 | if (nr_pages >= PAGES_PER_SECTION) | |
1063 | offline_mem_sections(pfn, ALIGN_DOWN(end_pfn, PAGES_PER_SECTION)); | |
1064 | ||
1065 | /* | |
1066 | * The pages associated with this vmemmap have been offlined, so | |
1067 | * we can reset its state here. | |
1068 | */ | |
1069 | remove_pfn_range_from_zone(page_zone(pfn_to_page(pfn)), pfn, nr_pages); | |
1070 | kasan_remove_zero_shadow(__va(PFN_PHYS(pfn)), PFN_PHYS(nr_pages)); | |
1071 | } | |
1072 | ||
836809ec DH |
1073 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, |
1074 | struct zone *zone, struct memory_group *group) | |
75884fb1 | 1075 | { |
aa47228a | 1076 | unsigned long flags; |
6811378e | 1077 | int need_zonelists_rebuild = 0; |
a08a2ae3 | 1078 | const int nid = zone_to_nid(zone); |
7b78d335 YG |
1079 | int ret; |
1080 | struct memory_notify arg; | |
d0dc12e8 | 1081 | |
dd8e2f23 OS |
1082 | /* |
1083 | * {on,off}lining is constrained to full memory sections (or more | |
041711ce | 1084 | * precisely to memory blocks from the user space POV). |
dd8e2f23 OS |
1085 | * memmap_on_memory is an exception because it reserves initial part |
1086 | * of the physical memory space for vmemmaps. That space is pageblock | |
1087 | * aligned. | |
1088 | */ | |
4986fac1 | 1089 | if (WARN_ON_ONCE(!nr_pages || |
dd8e2f23 OS |
1090 | !IS_ALIGNED(pfn, pageblock_nr_pages) || |
1091 | !IS_ALIGNED(pfn + nr_pages, PAGES_PER_SECTION))) | |
4986fac1 DH |
1092 | return -EINVAL; |
1093 | ||
381eab4a DH |
1094 | mem_hotplug_begin(); |
1095 | ||
f1dd2cd1 | 1096 | /* associate pfn range with the zone */ |
b30c5927 | 1097 | move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_ISOLATE); |
f1dd2cd1 | 1098 | |
7b78d335 YG |
1099 | arg.start_pfn = pfn; |
1100 | arg.nr_pages = nr_pages; | |
d9713679 | 1101 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 | 1102 | |
7b78d335 YG |
1103 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
1104 | ret = notifier_to_errno(ret); | |
e33e33b4 CY |
1105 | if (ret) |
1106 | goto failed_addition; | |
1107 | ||
b30c5927 DH |
1108 | /* |
1109 | * Fixup the number of isolated pageblocks before marking the sections | |
1110 | * onlining, such that undo_isolate_page_range() works correctly. | |
1111 | */ | |
1112 | spin_lock_irqsave(&zone->lock, flags); | |
1113 | zone->nr_isolate_pageblock += nr_pages / pageblock_nr_pages; | |
1114 | spin_unlock_irqrestore(&zone->lock, flags); | |
1115 | ||
6811378e YG |
1116 | /* |
1117 | * If this zone is not populated, then it is not in zonelist. | |
1118 | * This means the page allocator ignores this zone. | |
1119 | * So, zonelist must be updated after online. | |
1120 | */ | |
6dcd73d7 | 1121 | if (!populated_zone(zone)) { |
6811378e | 1122 | need_zonelists_rebuild = 1; |
72675e13 | 1123 | setup_zone_pageset(zone); |
6dcd73d7 | 1124 | } |
6811378e | 1125 | |
aac65321 | 1126 | online_pages_range(pfn, nr_pages); |
836809ec | 1127 | adjust_present_page_count(pfn_to_page(pfn), group, nr_pages); |
aa47228a | 1128 | |
b30c5927 DH |
1129 | node_states_set_node(nid, &arg); |
1130 | if (need_zonelists_rebuild) | |
1131 | build_all_zonelists(NULL); | |
b30c5927 DH |
1132 | |
1133 | /* Basic onlining is complete, allow allocation of onlined pages. */ | |
1134 | undo_isolate_page_range(pfn, pfn + nr_pages, MIGRATE_MOVABLE); | |
1135 | ||
93146d98 | 1136 | /* |
b86c5fc4 DH |
1137 | * Freshly onlined pages aren't shuffled (e.g., all pages are placed to |
1138 | * the tail of the freelist when undoing isolation). Shuffle the whole | |
1139 | * zone to make sure the just onlined pages are properly distributed | |
1140 | * across the whole freelist - to create an initial shuffle. | |
93146d98 | 1141 | */ |
e900a918 DW |
1142 | shuffle_zone(zone); |
1143 | ||
b92ca18e | 1144 | /* reinitialise watermarks and update pcp limits */ |
1b79acc9 KM |
1145 | init_per_zone_wmark_min(); |
1146 | ||
ca9a46f8 DH |
1147 | kswapd_run(nid); |
1148 | kcompactd_run(nid); | |
61b13993 | 1149 | |
2d1d43f6 | 1150 | writeback_set_ratelimit(); |
7b78d335 | 1151 | |
ca9a46f8 | 1152 | memory_notify(MEM_ONLINE, &arg); |
381eab4a | 1153 | mem_hotplug_done(); |
30467e0b | 1154 | return 0; |
e33e33b4 CY |
1155 | |
1156 | failed_addition: | |
1157 | pr_debug("online_pages [mem %#010llx-%#010llx] failed\n", | |
1158 | (unsigned long long) pfn << PAGE_SHIFT, | |
1159 | (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1); | |
1160 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
feee6b29 | 1161 | remove_pfn_range_from_zone(zone, pfn, nr_pages); |
381eab4a | 1162 | mem_hotplug_done(); |
e33e33b4 | 1163 | return ret; |
3947be19 | 1164 | } |
bc02af93 | 1165 | |
0bd85420 TC |
1166 | static void reset_node_present_pages(pg_data_t *pgdat) |
1167 | { | |
1168 | struct zone *z; | |
1169 | ||
1170 | for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) | |
1171 | z->present_pages = 0; | |
1172 | ||
1173 | pgdat->node_present_pages = 0; | |
1174 | } | |
1175 | ||
e1319331 | 1176 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
09f49dca | 1177 | static pg_data_t __ref *hotadd_init_pgdat(int nid) |
9af3c2de YG |
1178 | { |
1179 | struct pglist_data *pgdat; | |
9af3c2de | 1180 | |
09f49dca MH |
1181 | /* |
1182 | * NODE_DATA is preallocated (free_area_init) but its internal | |
1183 | * state is not allocated completely. Add missing pieces. | |
1184 | * Completely offline nodes stay around and they just need | |
1185 | * reintialization. | |
1186 | */ | |
70b5b46a | 1187 | pgdat = NODE_DATA(nid); |
03e85f9d | 1188 | |
9af3c2de | 1189 | /* init node's zones as empty zones, we don't have any present pages.*/ |
70b5b46a | 1190 | free_area_init_core_hotplug(pgdat); |
9af3c2de | 1191 | |
959ecc48 KH |
1192 | /* |
1193 | * The node we allocated has no zone fallback lists. For avoiding | |
1194 | * to access not-initialized zonelist, build here. | |
1195 | */ | |
72675e13 | 1196 | build_all_zonelists(pgdat); |
959ecc48 | 1197 | |
0bd85420 TC |
1198 | /* |
1199 | * When memory is hot-added, all the memory is in offline state. So | |
1200 | * clear all zones' present_pages because they will be updated in | |
1201 | * online_pages() and offline_pages(). | |
70b5b46a | 1202 | * TODO: should be in free_area_init_core_hotplug? |
0bd85420 | 1203 | */ |
03e85f9d | 1204 | reset_node_managed_pages(pgdat); |
0bd85420 TC |
1205 | reset_node_present_pages(pgdat); |
1206 | ||
9af3c2de YG |
1207 | return pgdat; |
1208 | } | |
1209 | ||
ba2d2666 MG |
1210 | /* |
1211 | * __try_online_node - online a node if offlined | |
e8b098fc | 1212 | * @nid: the node ID |
b9ff0360 | 1213 | * @set_node_online: Whether we want to online the node |
cf23422b | 1214 | * called by cpu_up() to online a node without onlined memory. |
b9ff0360 OS |
1215 | * |
1216 | * Returns: | |
1217 | * 1 -> a new node has been allocated | |
1218 | * 0 -> the node is already online | |
1219 | * -ENOMEM -> the node could not be allocated | |
cf23422b | 1220 | */ |
c68ab18c | 1221 | static int __try_online_node(int nid, bool set_node_online) |
cf23422b | 1222 | { |
b9ff0360 OS |
1223 | pg_data_t *pgdat; |
1224 | int ret = 1; | |
cf23422b | 1225 | |
01b0f197 TK |
1226 | if (node_online(nid)) |
1227 | return 0; | |
1228 | ||
09f49dca | 1229 | pgdat = hotadd_init_pgdat(nid); |
7553e8f2 | 1230 | if (!pgdat) { |
01b0f197 | 1231 | pr_err("Cannot online node %d due to NULL pgdat\n", nid); |
cf23422b | 1232 | ret = -ENOMEM; |
1233 | goto out; | |
1234 | } | |
b9ff0360 OS |
1235 | |
1236 | if (set_node_online) { | |
1237 | node_set_online(nid); | |
1238 | ret = register_one_node(nid); | |
1239 | BUG_ON(ret); | |
1240 | } | |
cf23422b | 1241 | out: |
b9ff0360 OS |
1242 | return ret; |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * Users of this function always want to online/register the node | |
1247 | */ | |
1248 | int try_online_node(int nid) | |
1249 | { | |
1250 | int ret; | |
1251 | ||
1252 | mem_hotplug_begin(); | |
c68ab18c | 1253 | ret = __try_online_node(nid, true); |
bfc8c901 | 1254 | mem_hotplug_done(); |
cf23422b | 1255 | return ret; |
1256 | } | |
1257 | ||
27356f54 TK |
1258 | static int check_hotplug_memory_range(u64 start, u64 size) |
1259 | { | |
ba325585 | 1260 | /* memory range must be block size aligned */ |
cec3ebd0 DH |
1261 | if (!size || !IS_ALIGNED(start, memory_block_size_bytes()) || |
1262 | !IS_ALIGNED(size, memory_block_size_bytes())) { | |
ba325585 | 1263 | pr_err("Block size [%#lx] unaligned hotplug range: start %#llx, size %#llx", |
cec3ebd0 | 1264 | memory_block_size_bytes(), start, size); |
27356f54 TK |
1265 | return -EINVAL; |
1266 | } | |
1267 | ||
1268 | return 0; | |
1269 | } | |
1270 | ||
31bc3858 VK |
1271 | static int online_memory_block(struct memory_block *mem, void *arg) |
1272 | { | |
1adf8b46 | 1273 | mem->online_type = mhp_default_online_type; |
dc18d706 | 1274 | return device_online(&mem->dev); |
31bc3858 VK |
1275 | } |
1276 | ||
a08a2ae3 OS |
1277 | bool mhp_supports_memmap_on_memory(unsigned long size) |
1278 | { | |
1279 | unsigned long nr_vmemmap_pages = size / PAGE_SIZE; | |
1280 | unsigned long vmemmap_size = nr_vmemmap_pages * sizeof(struct page); | |
1281 | unsigned long remaining_size = size - vmemmap_size; | |
1282 | ||
1283 | /* | |
1284 | * Besides having arch support and the feature enabled at runtime, we | |
1285 | * need a few more assumptions to hold true: | |
1286 | * | |
1287 | * a) We span a single memory block: memory onlining/offlinin;g happens | |
1288 | * in memory block granularity. We don't want the vmemmap of online | |
1289 | * memory blocks to reside on offline memory blocks. In the future, | |
1290 | * we might want to support variable-sized memory blocks to make the | |
1291 | * feature more versatile. | |
1292 | * | |
1293 | * b) The vmemmap pages span complete PMDs: We don't want vmemmap code | |
1294 | * to populate memory from the altmap for unrelated parts (i.e., | |
1295 | * other memory blocks) | |
1296 | * | |
1297 | * c) The vmemmap pages (and thereby the pages that will be exposed to | |
1298 | * the buddy) have to cover full pageblocks: memory onlining/offlining | |
1299 | * code requires applicable ranges to be page-aligned, for example, to | |
1300 | * set the migratetypes properly. | |
1301 | * | |
1302 | * TODO: Although we have a check here to make sure that vmemmap pages | |
1303 | * fully populate a PMD, it is not the right place to check for | |
1304 | * this. A much better solution involves improving vmemmap code | |
1305 | * to fallback to base pages when trying to populate vmemmap using | |
1306 | * altmap as an alternative source of memory, and we do not exactly | |
1307 | * populate a single PMD. | |
1308 | */ | |
6e02c46b | 1309 | return mhp_memmap_on_memory() && |
a08a2ae3 OS |
1310 | size == memory_block_size_bytes() && |
1311 | IS_ALIGNED(vmemmap_size, PMD_SIZE) && | |
1312 | IS_ALIGNED(remaining_size, (pageblock_nr_pages << PAGE_SHIFT)); | |
1313 | } | |
1314 | ||
8df1d0e4 DH |
1315 | /* |
1316 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1317 | * and online/offline operations (triggered e.g. by sysfs). | |
1318 | * | |
1319 | * we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG | |
1320 | */ | |
b6117199 | 1321 | int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags) |
bc02af93 | 1322 | { |
d15dfd31 | 1323 | struct mhp_params params = { .pgprot = pgprot_mhp(PAGE_KERNEL) }; |
32befe9e | 1324 | enum memblock_flags memblock_flags = MEMBLOCK_NONE; |
a08a2ae3 | 1325 | struct vmem_altmap mhp_altmap = {}; |
028fc57a | 1326 | struct memory_group *group = NULL; |
62cedb9f | 1327 | u64 start, size; |
b9ff0360 | 1328 | bool new_node = false; |
bc02af93 YG |
1329 | int ret; |
1330 | ||
62cedb9f DV |
1331 | start = res->start; |
1332 | size = resource_size(res); | |
1333 | ||
27356f54 TK |
1334 | ret = check_hotplug_memory_range(start, size); |
1335 | if (ret) | |
1336 | return ret; | |
1337 | ||
028fc57a DH |
1338 | if (mhp_flags & MHP_NID_IS_MGID) { |
1339 | group = memory_group_find_by_id(nid); | |
1340 | if (!group) | |
1341 | return -EINVAL; | |
1342 | nid = group->nid; | |
1343 | } | |
1344 | ||
fa6d9ec7 VV |
1345 | if (!node_possible(nid)) { |
1346 | WARN(1, "node %d was absent from the node_possible_map\n", nid); | |
1347 | return -EINVAL; | |
1348 | } | |
1349 | ||
bfc8c901 | 1350 | mem_hotplug_begin(); |
ac13c462 | 1351 | |
53d38316 | 1352 | if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) { |
32befe9e DH |
1353 | if (res->flags & IORESOURCE_SYSRAM_DRIVER_MANAGED) |
1354 | memblock_flags = MEMBLOCK_DRIVER_MANAGED; | |
1355 | ret = memblock_add_node(start, size, nid, memblock_flags); | |
53d38316 DH |
1356 | if (ret) |
1357 | goto error_mem_hotplug_end; | |
1358 | } | |
7f36e3e5 | 1359 | |
c68ab18c | 1360 | ret = __try_online_node(nid, false); |
b9ff0360 OS |
1361 | if (ret < 0) |
1362 | goto error; | |
1363 | new_node = ret; | |
9af3c2de | 1364 | |
a08a2ae3 OS |
1365 | /* |
1366 | * Self hosted memmap array | |
1367 | */ | |
1368 | if (mhp_flags & MHP_MEMMAP_ON_MEMORY) { | |
1369 | if (!mhp_supports_memmap_on_memory(size)) { | |
1370 | ret = -EINVAL; | |
1371 | goto error; | |
1372 | } | |
1373 | mhp_altmap.free = PHYS_PFN(size); | |
1374 | mhp_altmap.base_pfn = PHYS_PFN(start); | |
1375 | params.altmap = &mhp_altmap; | |
1376 | } | |
1377 | ||
bc02af93 | 1378 | /* call arch's memory hotadd */ |
f5637d3b | 1379 | ret = arch_add_memory(nid, start, size, ¶ms); |
9af3c2de YG |
1380 | if (ret < 0) |
1381 | goto error; | |
1382 | ||
db051a0d | 1383 | /* create memory block devices after memory was added */ |
028fc57a DH |
1384 | ret = create_memory_block_devices(start, size, mhp_altmap.alloc, |
1385 | group); | |
db051a0d | 1386 | if (ret) { |
65a2aa5f | 1387 | arch_remove_memory(start, size, NULL); |
db051a0d DH |
1388 | goto error; |
1389 | } | |
1390 | ||
a1e565aa | 1391 | if (new_node) { |
d5b6f6a3 | 1392 | /* If sysfs file of new node can't be created, cpu on the node |
0fc44159 YG |
1393 | * can't be hot-added. There is no rollback way now. |
1394 | * So, check by BUG_ON() to catch it reluctantly.. | |
d5b6f6a3 | 1395 | * We online node here. We can't roll back from here. |
0fc44159 | 1396 | */ |
d5b6f6a3 OS |
1397 | node_set_online(nid); |
1398 | ret = __register_one_node(nid); | |
0fc44159 YG |
1399 | BUG_ON(ret); |
1400 | } | |
1401 | ||
cc651559 DH |
1402 | register_memory_blocks_under_node(nid, PFN_DOWN(start), |
1403 | PFN_UP(start + size - 1), | |
1404 | MEMINIT_HOTPLUG); | |
d5b6f6a3 | 1405 | |
d96ae530 | 1406 | /* create new memmap entry */ |
7b7b2721 DH |
1407 | if (!strcmp(res->name, "System RAM")) |
1408 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
d96ae530 | 1409 | |
381eab4a DH |
1410 | /* device_online() will take the lock when calling online_pages() */ |
1411 | mem_hotplug_done(); | |
1412 | ||
9ca6551e DH |
1413 | /* |
1414 | * In case we're allowed to merge the resource, flag it and trigger | |
1415 | * merging now that adding succeeded. | |
1416 | */ | |
26011267 | 1417 | if (mhp_flags & MHP_MERGE_RESOURCE) |
9ca6551e DH |
1418 | merge_system_ram_resource(res); |
1419 | ||
31bc3858 | 1420 | /* online pages if requested */ |
1adf8b46 | 1421 | if (mhp_default_online_type != MMOP_OFFLINE) |
fbcf73ce | 1422 | walk_memory_blocks(start, size, NULL, online_memory_block); |
31bc3858 | 1423 | |
381eab4a | 1424 | return ret; |
9af3c2de | 1425 | error: |
52219aea DH |
1426 | if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) |
1427 | memblock_remove(start, size); | |
53d38316 | 1428 | error_mem_hotplug_end: |
bfc8c901 | 1429 | mem_hotplug_done(); |
bc02af93 YG |
1430 | return ret; |
1431 | } | |
62cedb9f | 1432 | |
8df1d0e4 | 1433 | /* requires device_hotplug_lock, see add_memory_resource() */ |
b6117199 | 1434 | int __ref __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags) |
62cedb9f DV |
1435 | { |
1436 | struct resource *res; | |
1437 | int ret; | |
1438 | ||
7b7b2721 | 1439 | res = register_memory_resource(start, size, "System RAM"); |
6f754ba4 VK |
1440 | if (IS_ERR(res)) |
1441 | return PTR_ERR(res); | |
62cedb9f | 1442 | |
b6117199 | 1443 | ret = add_memory_resource(nid, res, mhp_flags); |
62cedb9f DV |
1444 | if (ret < 0) |
1445 | release_memory_resource(res); | |
1446 | return ret; | |
1447 | } | |
8df1d0e4 | 1448 | |
b6117199 | 1449 | int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags) |
8df1d0e4 DH |
1450 | { |
1451 | int rc; | |
1452 | ||
1453 | lock_device_hotplug(); | |
b6117199 | 1454 | rc = __add_memory(nid, start, size, mhp_flags); |
8df1d0e4 DH |
1455 | unlock_device_hotplug(); |
1456 | ||
1457 | return rc; | |
1458 | } | |
bc02af93 | 1459 | EXPORT_SYMBOL_GPL(add_memory); |
0c0e6195 | 1460 | |
7b7b2721 DH |
1461 | /* |
1462 | * Add special, driver-managed memory to the system as system RAM. Such | |
1463 | * memory is not exposed via the raw firmware-provided memmap as system | |
1464 | * RAM, instead, it is detected and added by a driver - during cold boot, | |
1465 | * after a reboot, and after kexec. | |
1466 | * | |
1467 | * Reasons why this memory should not be used for the initial memmap of a | |
1468 | * kexec kernel or for placing kexec images: | |
1469 | * - The booting kernel is in charge of determining how this memory will be | |
1470 | * used (e.g., use persistent memory as system RAM) | |
1471 | * - Coordination with a hypervisor is required before this memory | |
1472 | * can be used (e.g., inaccessible parts). | |
1473 | * | |
1474 | * For this memory, no entries in /sys/firmware/memmap ("raw firmware-provided | |
1475 | * memory map") are created. Also, the created memory resource is flagged | |
7cf603d1 | 1476 | * with IORESOURCE_SYSRAM_DRIVER_MANAGED, so in-kernel users can special-case |
7b7b2721 DH |
1477 | * this memory as well (esp., not place kexec images onto it). |
1478 | * | |
1479 | * The resource_name (visible via /proc/iomem) has to have the format | |
1480 | * "System RAM ($DRIVER)". | |
1481 | */ | |
1482 | int add_memory_driver_managed(int nid, u64 start, u64 size, | |
b6117199 | 1483 | const char *resource_name, mhp_t mhp_flags) |
7b7b2721 DH |
1484 | { |
1485 | struct resource *res; | |
1486 | int rc; | |
1487 | ||
1488 | if (!resource_name || | |
1489 | strstr(resource_name, "System RAM (") != resource_name || | |
1490 | resource_name[strlen(resource_name) - 1] != ')') | |
1491 | return -EINVAL; | |
1492 | ||
1493 | lock_device_hotplug(); | |
1494 | ||
1495 | res = register_memory_resource(start, size, resource_name); | |
1496 | if (IS_ERR(res)) { | |
1497 | rc = PTR_ERR(res); | |
1498 | goto out_unlock; | |
1499 | } | |
1500 | ||
b6117199 | 1501 | rc = add_memory_resource(nid, res, mhp_flags); |
7b7b2721 DH |
1502 | if (rc < 0) |
1503 | release_memory_resource(res); | |
1504 | ||
1505 | out_unlock: | |
1506 | unlock_device_hotplug(); | |
1507 | return rc; | |
1508 | } | |
1509 | EXPORT_SYMBOL_GPL(add_memory_driver_managed); | |
1510 | ||
bca3feaa AK |
1511 | /* |
1512 | * Platforms should define arch_get_mappable_range() that provides | |
1513 | * maximum possible addressable physical memory range for which the | |
1514 | * linear mapping could be created. The platform returned address | |
1515 | * range must adhere to these following semantics. | |
1516 | * | |
1517 | * - range.start <= range.end | |
1518 | * - Range includes both end points [range.start..range.end] | |
1519 | * | |
1520 | * There is also a fallback definition provided here, allowing the | |
1521 | * entire possible physical address range in case any platform does | |
1522 | * not define arch_get_mappable_range(). | |
1523 | */ | |
1524 | struct range __weak arch_get_mappable_range(void) | |
1525 | { | |
1526 | struct range mhp_range = { | |
1527 | .start = 0UL, | |
1528 | .end = -1ULL, | |
1529 | }; | |
1530 | return mhp_range; | |
1531 | } | |
1532 | ||
1533 | struct range mhp_get_pluggable_range(bool need_mapping) | |
1534 | { | |
1535 | const u64 max_phys = (1ULL << MAX_PHYSMEM_BITS) - 1; | |
1536 | struct range mhp_range; | |
1537 | ||
1538 | if (need_mapping) { | |
1539 | mhp_range = arch_get_mappable_range(); | |
1540 | if (mhp_range.start > max_phys) { | |
1541 | mhp_range.start = 0; | |
1542 | mhp_range.end = 0; | |
1543 | } | |
1544 | mhp_range.end = min_t(u64, mhp_range.end, max_phys); | |
1545 | } else { | |
1546 | mhp_range.start = 0; | |
1547 | mhp_range.end = max_phys; | |
1548 | } | |
1549 | return mhp_range; | |
1550 | } | |
1551 | EXPORT_SYMBOL_GPL(mhp_get_pluggable_range); | |
1552 | ||
1553 | bool mhp_range_allowed(u64 start, u64 size, bool need_mapping) | |
1554 | { | |
1555 | struct range mhp_range = mhp_get_pluggable_range(need_mapping); | |
1556 | u64 end = start + size; | |
1557 | ||
1558 | if (start < end && start >= mhp_range.start && (end - 1) <= mhp_range.end) | |
1559 | return true; | |
1560 | ||
1561 | pr_warn("Hotplug memory [%#llx-%#llx] exceeds maximum addressable range [%#llx-%#llx]\n", | |
1562 | start, end, mhp_range.start, mhp_range.end); | |
1563 | return false; | |
1564 | } | |
1565 | ||
0c0e6195 | 1566 | #ifdef CONFIG_MEMORY_HOTREMOVE |
0c0e6195 | 1567 | /* |
0efadf48 | 1568 | * Scan pfn range [start,end) to find movable/migratable pages (LRU pages, |
aa218795 DH |
1569 | * non-lru movable pages and hugepages). Will skip over most unmovable |
1570 | * pages (esp., pages that can be skipped when offlining), but bail out on | |
1571 | * definitely unmovable pages. | |
1572 | * | |
1573 | * Returns: | |
1574 | * 0 in case a movable page is found and movable_pfn was updated. | |
1575 | * -ENOENT in case no movable page was found. | |
1576 | * -EBUSY in case a definitely unmovable page was found. | |
0c0e6195 | 1577 | */ |
aa218795 DH |
1578 | static int scan_movable_pages(unsigned long start, unsigned long end, |
1579 | unsigned long *movable_pfn) | |
0c0e6195 KH |
1580 | { |
1581 | unsigned long pfn; | |
eeb0efd0 | 1582 | |
0c0e6195 | 1583 | for (pfn = start; pfn < end; pfn++) { |
eeb0efd0 OS |
1584 | struct page *page, *head; |
1585 | unsigned long skip; | |
1586 | ||
1587 | if (!pfn_valid(pfn)) | |
1588 | continue; | |
1589 | page = pfn_to_page(pfn); | |
1590 | if (PageLRU(page)) | |
aa218795 | 1591 | goto found; |
eeb0efd0 | 1592 | if (__PageMovable(page)) |
aa218795 DH |
1593 | goto found; |
1594 | ||
1595 | /* | |
1596 | * PageOffline() pages that are not marked __PageMovable() and | |
1597 | * have a reference count > 0 (after MEM_GOING_OFFLINE) are | |
1598 | * definitely unmovable. If their reference count would be 0, | |
1599 | * they could at least be skipped when offlining memory. | |
1600 | */ | |
1601 | if (PageOffline(page) && page_count(page)) | |
1602 | return -EBUSY; | |
eeb0efd0 OS |
1603 | |
1604 | if (!PageHuge(page)) | |
1605 | continue; | |
1606 | head = compound_head(page); | |
8f251a3d MK |
1607 | /* |
1608 | * This test is racy as we hold no reference or lock. The | |
1609 | * hugetlb page could have been free'ed and head is no longer | |
1610 | * a hugetlb page before the following check. In such unlikely | |
1611 | * cases false positives and negatives are possible. Calling | |
1612 | * code must deal with these scenarios. | |
1613 | */ | |
1614 | if (HPageMigratable(head)) | |
aa218795 | 1615 | goto found; |
d8c6546b | 1616 | skip = compound_nr(head) - (page - head); |
eeb0efd0 | 1617 | pfn += skip - 1; |
0c0e6195 | 1618 | } |
aa218795 DH |
1619 | return -ENOENT; |
1620 | found: | |
1621 | *movable_pfn = pfn; | |
0c0e6195 KH |
1622 | return 0; |
1623 | } | |
1624 | ||
0c0e6195 KH |
1625 | static int |
1626 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1627 | { | |
1628 | unsigned long pfn; | |
6c357848 | 1629 | struct page *page, *head; |
0c0e6195 KH |
1630 | int ret = 0; |
1631 | LIST_HEAD(source); | |
786dee86 LM |
1632 | static DEFINE_RATELIMIT_STATE(migrate_rs, DEFAULT_RATELIMIT_INTERVAL, |
1633 | DEFAULT_RATELIMIT_BURST); | |
0c0e6195 | 1634 | |
a85009c3 | 1635 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { |
869f7ee6 MWO |
1636 | struct folio *folio; |
1637 | ||
0c0e6195 KH |
1638 | if (!pfn_valid(pfn)) |
1639 | continue; | |
1640 | page = pfn_to_page(pfn); | |
869f7ee6 MWO |
1641 | folio = page_folio(page); |
1642 | head = &folio->page; | |
c8721bbb NH |
1643 | |
1644 | if (PageHuge(page)) { | |
d8c6546b | 1645 | pfn = page_to_pfn(head) + compound_nr(head) - 1; |
daf3538a | 1646 | isolate_huge_page(head, &source); |
c8721bbb | 1647 | continue; |
94723aaf | 1648 | } else if (PageTransHuge(page)) |
6c357848 | 1649 | pfn = page_to_pfn(head) + thp_nr_pages(page) - 1; |
c8721bbb | 1650 | |
b15c8726 MH |
1651 | /* |
1652 | * HWPoison pages have elevated reference counts so the migration would | |
1653 | * fail on them. It also doesn't make any sense to migrate them in the | |
1654 | * first place. Still try to unmap such a page in case it is still mapped | |
1655 | * (e.g. current hwpoison implementation doesn't unmap KSM pages but keep | |
1656 | * the unmap as the catch all safety net). | |
1657 | */ | |
1658 | if (PageHWPoison(page)) { | |
869f7ee6 MWO |
1659 | if (WARN_ON(folio_test_lru(folio))) |
1660 | folio_isolate_lru(folio); | |
1661 | if (folio_mapped(folio)) | |
1662 | try_to_unmap(folio, TTU_IGNORE_MLOCK); | |
b15c8726 MH |
1663 | continue; |
1664 | } | |
1665 | ||
700c2a46 | 1666 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1667 | continue; |
1668 | /* | |
0efadf48 YX |
1669 | * We can skip free pages. And we can deal with pages on |
1670 | * LRU and non-lru movable pages. | |
0c0e6195 | 1671 | */ |
0efadf48 YX |
1672 | if (PageLRU(page)) |
1673 | ret = isolate_lru_page(page); | |
1674 | else | |
1675 | ret = isolate_movable_page(page, ISOLATE_UNEVICTABLE); | |
0c0e6195 | 1676 | if (!ret) { /* Success */ |
62695a84 | 1677 | list_add_tail(&page->lru, &source); |
0efadf48 YX |
1678 | if (!__PageMovable(page)) |
1679 | inc_node_page_state(page, NR_ISOLATED_ANON + | |
9de4f22a | 1680 | page_is_file_lru(page)); |
6d9c285a | 1681 | |
0c0e6195 | 1682 | } else { |
786dee86 LM |
1683 | if (__ratelimit(&migrate_rs)) { |
1684 | pr_warn("failed to isolate pfn %lx\n", pfn); | |
1685 | dump_page(page, "isolation failed"); | |
1686 | } | |
0c0e6195 | 1687 | } |
1723058e | 1688 | put_page(page); |
0c0e6195 | 1689 | } |
f3ab2636 | 1690 | if (!list_empty(&source)) { |
203e6e5c JK |
1691 | nodemask_t nmask = node_states[N_MEMORY]; |
1692 | struct migration_target_control mtc = { | |
1693 | .nmask = &nmask, | |
1694 | .gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL, | |
1695 | }; | |
1696 | ||
1697 | /* | |
1698 | * We have checked that migration range is on a single zone so | |
1699 | * we can use the nid of the first page to all the others. | |
1700 | */ | |
1701 | mtc.nid = page_to_nid(list_first_entry(&source, struct page, lru)); | |
1702 | ||
1703 | /* | |
1704 | * try to allocate from a different node but reuse this node | |
1705 | * if there are no other online nodes to be used (e.g. we are | |
1706 | * offlining a part of the only existing node) | |
1707 | */ | |
1708 | node_clear(mtc.nid, nmask); | |
1709 | if (nodes_empty(nmask)) | |
1710 | node_set(mtc.nid, nmask); | |
1711 | ret = migrate_pages(&source, alloc_migration_target, NULL, | |
5ac95884 | 1712 | (unsigned long)&mtc, MIGRATE_SYNC, MR_MEMORY_HOTPLUG, NULL); |
2932c8b0 MH |
1713 | if (ret) { |
1714 | list_for_each_entry(page, &source, lru) { | |
786dee86 LM |
1715 | if (__ratelimit(&migrate_rs)) { |
1716 | pr_warn("migrating pfn %lx failed ret:%d\n", | |
1717 | page_to_pfn(page), ret); | |
1718 | dump_page(page, "migration failure"); | |
1719 | } | |
2932c8b0 | 1720 | } |
c8721bbb | 1721 | putback_movable_pages(&source); |
2932c8b0 | 1722 | } |
0c0e6195 | 1723 | } |
1723058e | 1724 | |
0c0e6195 KH |
1725 | return ret; |
1726 | } | |
1727 | ||
c5320926 TC |
1728 | static int __init cmdline_parse_movable_node(char *p) |
1729 | { | |
55ac590c | 1730 | movable_node_enabled = true; |
c5320926 TC |
1731 | return 0; |
1732 | } | |
1733 | early_param("movable_node", cmdline_parse_movable_node); | |
1734 | ||
d9713679 LJ |
1735 | /* check which state of node_states will be changed when offline memory */ |
1736 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1737 | struct zone *zone, struct memory_notify *arg) | |
1738 | { | |
1739 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1740 | unsigned long present_pages = 0; | |
86b27bea | 1741 | enum zone_type zt; |
d9713679 | 1742 | |
98fa15f3 AK |
1743 | arg->status_change_nid = NUMA_NO_NODE; |
1744 | arg->status_change_nid_normal = NUMA_NO_NODE; | |
d9713679 LJ |
1745 | |
1746 | /* | |
86b27bea OS |
1747 | * Check whether node_states[N_NORMAL_MEMORY] will be changed. |
1748 | * If the memory to be offline is within the range | |
1749 | * [0..ZONE_NORMAL], and it is the last present memory there, | |
1750 | * the zones in that range will become empty after the offlining, | |
1751 | * thus we can determine that we need to clear the node from | |
1752 | * node_states[N_NORMAL_MEMORY]. | |
d9713679 | 1753 | */ |
86b27bea | 1754 | for (zt = 0; zt <= ZONE_NORMAL; zt++) |
d9713679 | 1755 | present_pages += pgdat->node_zones[zt].present_pages; |
86b27bea | 1756 | if (zone_idx(zone) <= ZONE_NORMAL && nr_pages >= present_pages) |
d9713679 | 1757 | arg->status_change_nid_normal = zone_to_nid(zone); |
d9713679 LJ |
1758 | |
1759 | /* | |
6b740c6c DH |
1760 | * We have accounted the pages from [0..ZONE_NORMAL); ZONE_HIGHMEM |
1761 | * does not apply as we don't support 32bit. | |
86b27bea OS |
1762 | * Here we count the possible pages from ZONE_MOVABLE. |
1763 | * If after having accounted all the pages, we see that the nr_pages | |
1764 | * to be offlined is over or equal to the accounted pages, | |
1765 | * we know that the node will become empty, and so, we can clear | |
1766 | * it for N_MEMORY as well. | |
d9713679 | 1767 | */ |
86b27bea | 1768 | present_pages += pgdat->node_zones[ZONE_MOVABLE].present_pages; |
d9713679 | 1769 | |
d9713679 LJ |
1770 | if (nr_pages >= present_pages) |
1771 | arg->status_change_nid = zone_to_nid(zone); | |
d9713679 LJ |
1772 | } |
1773 | ||
1774 | static void node_states_clear_node(int node, struct memory_notify *arg) | |
1775 | { | |
1776 | if (arg->status_change_nid_normal >= 0) | |
1777 | node_clear_state(node, N_NORMAL_MEMORY); | |
1778 | ||
cf01f6f5 | 1779 | if (arg->status_change_nid >= 0) |
6715ddf9 | 1780 | node_clear_state(node, N_MEMORY); |
d9713679 LJ |
1781 | } |
1782 | ||
c5e79ef5 DH |
1783 | static int count_system_ram_pages_cb(unsigned long start_pfn, |
1784 | unsigned long nr_pages, void *data) | |
1785 | { | |
1786 | unsigned long *nr_system_ram_pages = data; | |
1787 | ||
1788 | *nr_system_ram_pages += nr_pages; | |
1789 | return 0; | |
1790 | } | |
1791 | ||
836809ec | 1792 | int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages, |
395f6081 | 1793 | struct zone *zone, struct memory_group *group) |
0c0e6195 | 1794 | { |
73a11c96 | 1795 | const unsigned long end_pfn = start_pfn + nr_pages; |
0a1a9a00 | 1796 | unsigned long pfn, system_ram_pages = 0; |
395f6081 | 1797 | const int node = zone_to_nid(zone); |
d702909f | 1798 | unsigned long flags; |
7b78d335 | 1799 | struct memory_notify arg; |
79605093 | 1800 | char *reason; |
395f6081 | 1801 | int ret; |
0c0e6195 | 1802 | |
dd8e2f23 OS |
1803 | /* |
1804 | * {on,off}lining is constrained to full memory sections (or more | |
041711ce | 1805 | * precisely to memory blocks from the user space POV). |
dd8e2f23 OS |
1806 | * memmap_on_memory is an exception because it reserves initial part |
1807 | * of the physical memory space for vmemmaps. That space is pageblock | |
1808 | * aligned. | |
1809 | */ | |
4986fac1 | 1810 | if (WARN_ON_ONCE(!nr_pages || |
dd8e2f23 OS |
1811 | !IS_ALIGNED(start_pfn, pageblock_nr_pages) || |
1812 | !IS_ALIGNED(start_pfn + nr_pages, PAGES_PER_SECTION))) | |
4986fac1 DH |
1813 | return -EINVAL; |
1814 | ||
381eab4a DH |
1815 | mem_hotplug_begin(); |
1816 | ||
c5e79ef5 DH |
1817 | /* |
1818 | * Don't allow to offline memory blocks that contain holes. | |
1819 | * Consequently, memory blocks with holes can never get onlined | |
1820 | * via the hotplug path - online_pages() - as hotplugged memory has | |
1821 | * no holes. This way, we e.g., don't have to worry about marking | |
1822 | * memory holes PG_reserved, don't need pfn_valid() checks, and can | |
1823 | * avoid using walk_system_ram_range() later. | |
1824 | */ | |
73a11c96 | 1825 | walk_system_ram_range(start_pfn, nr_pages, &system_ram_pages, |
c5e79ef5 | 1826 | count_system_ram_pages_cb); |
73a11c96 | 1827 | if (system_ram_pages != nr_pages) { |
c5e79ef5 DH |
1828 | ret = -EINVAL; |
1829 | reason = "memory holes"; | |
1830 | goto failed_removal; | |
1831 | } | |
1832 | ||
395f6081 DH |
1833 | /* |
1834 | * We only support offlining of memory blocks managed by a single zone, | |
1835 | * checked by calling code. This is just a sanity check that we might | |
1836 | * want to remove in the future. | |
1837 | */ | |
1838 | if (WARN_ON_ONCE(page_zone(pfn_to_page(start_pfn)) != zone || | |
1839 | page_zone(pfn_to_page(end_pfn - 1)) != zone)) { | |
79605093 MH |
1840 | ret = -EINVAL; |
1841 | reason = "multizone range"; | |
1842 | goto failed_removal; | |
381eab4a | 1843 | } |
7b78d335 | 1844 | |
ec6e8c7e VB |
1845 | /* |
1846 | * Disable pcplists so that page isolation cannot race with freeing | |
1847 | * in a way that pages from isolated pageblock are left on pcplists. | |
1848 | */ | |
1849 | zone_pcp_disable(zone); | |
d479960e | 1850 | lru_cache_disable(); |
ec6e8c7e | 1851 | |
0c0e6195 | 1852 | /* set above range as isolated */ |
b023f468 | 1853 | ret = start_isolate_page_range(start_pfn, end_pfn, |
d381c547 | 1854 | MIGRATE_MOVABLE, |
b2c9e2fb ZY |
1855 | MEMORY_OFFLINE | REPORT_FAILURE, |
1856 | GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL); | |
3fa0c7c7 | 1857 | if (ret) { |
79605093 | 1858 | reason = "failure to isolate range"; |
ec6e8c7e | 1859 | goto failed_removal_pcplists_disabled; |
381eab4a | 1860 | } |
7b78d335 YG |
1861 | |
1862 | arg.start_pfn = start_pfn; | |
1863 | arg.nr_pages = nr_pages; | |
d9713679 | 1864 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1865 | |
1866 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1867 | ret = notifier_to_errno(ret); | |
79605093 MH |
1868 | if (ret) { |
1869 | reason = "notifier failure"; | |
1870 | goto failed_removal_isolated; | |
1871 | } | |
7b78d335 | 1872 | |
bb8965bd | 1873 | do { |
aa218795 DH |
1874 | pfn = start_pfn; |
1875 | do { | |
bb8965bd MH |
1876 | if (signal_pending(current)) { |
1877 | ret = -EINTR; | |
1878 | reason = "signal backoff"; | |
1879 | goto failed_removal_isolated; | |
1880 | } | |
72b39cfc | 1881 | |
bb8965bd | 1882 | cond_resched(); |
bb8965bd | 1883 | |
aa218795 DH |
1884 | ret = scan_movable_pages(pfn, end_pfn, &pfn); |
1885 | if (!ret) { | |
bb8965bd MH |
1886 | /* |
1887 | * TODO: fatal migration failures should bail | |
1888 | * out | |
1889 | */ | |
1890 | do_migrate_range(pfn, end_pfn); | |
1891 | } | |
aa218795 DH |
1892 | } while (!ret); |
1893 | ||
1894 | if (ret != -ENOENT) { | |
1895 | reason = "unmovable page"; | |
1896 | goto failed_removal_isolated; | |
bb8965bd | 1897 | } |
0c0e6195 | 1898 | |
bb8965bd MH |
1899 | /* |
1900 | * Dissolve free hugepages in the memory block before doing | |
1901 | * offlining actually in order to make hugetlbfs's object | |
1902 | * counting consistent. | |
1903 | */ | |
1904 | ret = dissolve_free_huge_pages(start_pfn, end_pfn); | |
1905 | if (ret) { | |
1906 | reason = "failure to dissolve huge pages"; | |
1907 | goto failed_removal_isolated; | |
1908 | } | |
0a1a9a00 | 1909 | |
0a1a9a00 | 1910 | ret = test_pages_isolated(start_pfn, end_pfn, MEMORY_OFFLINE); |
ec6e8c7e | 1911 | |
5557c766 | 1912 | } while (ret); |
72b39cfc | 1913 | |
0a1a9a00 DH |
1914 | /* Mark all sections offline and remove free pages from the buddy. */ |
1915 | __offline_isolated_pages(start_pfn, end_pfn); | |
7c33023a | 1916 | pr_debug("Offlined Pages %ld\n", nr_pages); |
0a1a9a00 | 1917 | |
9b7ea46a | 1918 | /* |
b30c5927 DH |
1919 | * The memory sections are marked offline, and the pageblock flags |
1920 | * effectively stale; nobody should be touching them. Fixup the number | |
1921 | * of isolated pageblocks, memory onlining will properly revert this. | |
9b7ea46a QC |
1922 | */ |
1923 | spin_lock_irqsave(&zone->lock, flags); | |
ea15153c | 1924 | zone->nr_isolate_pageblock -= nr_pages / pageblock_nr_pages; |
9b7ea46a QC |
1925 | spin_unlock_irqrestore(&zone->lock, flags); |
1926 | ||
d479960e | 1927 | lru_cache_enable(); |
ec6e8c7e VB |
1928 | zone_pcp_enable(zone); |
1929 | ||
0c0e6195 | 1930 | /* removal success */ |
0a1a9a00 | 1931 | adjust_managed_page_count(pfn_to_page(start_pfn), -nr_pages); |
836809ec | 1932 | adjust_present_page_count(pfn_to_page(start_pfn), group, -nr_pages); |
7b78d335 | 1933 | |
b92ca18e | 1934 | /* reinitialise watermarks and update pcp limits */ |
1b79acc9 KM |
1935 | init_per_zone_wmark_min(); |
1936 | ||
1e8537ba | 1937 | if (!populated_zone(zone)) { |
340175b7 | 1938 | zone_pcp_reset(zone); |
72675e13 | 1939 | build_all_zonelists(NULL); |
b92ca18e | 1940 | } |
340175b7 | 1941 | |
d9713679 | 1942 | node_states_clear_node(node, &arg); |
698b1b30 | 1943 | if (arg.status_change_nid >= 0) { |
8fe23e05 | 1944 | kswapd_stop(node); |
698b1b30 VB |
1945 | kcompactd_stop(node); |
1946 | } | |
bce7394a | 1947 | |
0c0e6195 | 1948 | writeback_set_ratelimit(); |
7b78d335 YG |
1949 | |
1950 | memory_notify(MEM_OFFLINE, &arg); | |
feee6b29 | 1951 | remove_pfn_range_from_zone(zone, start_pfn, nr_pages); |
381eab4a | 1952 | mem_hotplug_done(); |
0c0e6195 KH |
1953 | return 0; |
1954 | ||
79605093 | 1955 | failed_removal_isolated: |
36ba30bc | 1956 | /* pushback to free area */ |
79605093 | 1957 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
c4efe484 | 1958 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
ec6e8c7e | 1959 | failed_removal_pcplists_disabled: |
946746d1 | 1960 | lru_cache_enable(); |
ec6e8c7e | 1961 | zone_pcp_enable(zone); |
0c0e6195 | 1962 | failed_removal: |
79605093 | 1963 | pr_debug("memory offlining [mem %#010llx-%#010llx] failed due to %s\n", |
e33e33b4 | 1964 | (unsigned long long) start_pfn << PAGE_SHIFT, |
79605093 MH |
1965 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1, |
1966 | reason); | |
381eab4a | 1967 | mem_hotplug_done(); |
0c0e6195 KH |
1968 | return ret; |
1969 | } | |
71088785 | 1970 | |
d6de9d53 | 1971 | static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) |
bbc76be6 WC |
1972 | { |
1973 | int ret = !is_memblock_offlined(mem); | |
e1c158e4 | 1974 | int *nid = arg; |
bbc76be6 | 1975 | |
e1c158e4 | 1976 | *nid = mem->nid; |
349daa0f RD |
1977 | if (unlikely(ret)) { |
1978 | phys_addr_t beginpa, endpa; | |
1979 | ||
1980 | beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); | |
b6c88d3b | 1981 | endpa = beginpa + memory_block_size_bytes() - 1; |
756a025f | 1982 | pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n", |
349daa0f | 1983 | &beginpa, &endpa); |
bbc76be6 | 1984 | |
eca499ab PT |
1985 | return -EBUSY; |
1986 | } | |
1987 | return 0; | |
bbc76be6 WC |
1988 | } |
1989 | ||
a08a2ae3 OS |
1990 | static int get_nr_vmemmap_pages_cb(struct memory_block *mem, void *arg) |
1991 | { | |
1992 | /* | |
1993 | * If not set, continue with the next block. | |
1994 | */ | |
1995 | return mem->nr_vmemmap_pages; | |
1996 | } | |
1997 | ||
b27340a5 | 1998 | static int check_cpu_on_node(int nid) |
60a5a19e | 1999 | { |
60a5a19e TC |
2000 | int cpu; |
2001 | ||
2002 | for_each_present_cpu(cpu) { | |
b27340a5 | 2003 | if (cpu_to_node(cpu) == nid) |
60a5a19e TC |
2004 | /* |
2005 | * the cpu on this node isn't removed, and we can't | |
2006 | * offline this node. | |
2007 | */ | |
2008 | return -EBUSY; | |
2009 | } | |
2010 | ||
2011 | return 0; | |
2012 | } | |
2013 | ||
2c91f8fc DH |
2014 | static int check_no_memblock_for_node_cb(struct memory_block *mem, void *arg) |
2015 | { | |
2016 | int nid = *(int *)arg; | |
2017 | ||
2018 | /* | |
2019 | * If a memory block belongs to multiple nodes, the stored nid is not | |
2020 | * reliable. However, such blocks are always online (e.g., cannot get | |
2021 | * offlined) and, therefore, are still spanned by the node. | |
2022 | */ | |
2023 | return mem->nid == nid ? -EEXIST : 0; | |
2024 | } | |
2025 | ||
0f1cfe9d TK |
2026 | /** |
2027 | * try_offline_node | |
e8b098fc | 2028 | * @nid: the node ID |
0f1cfe9d TK |
2029 | * |
2030 | * Offline a node if all memory sections and cpus of the node are removed. | |
2031 | * | |
2032 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
2033 | * and online/offline operations before this call. | |
2034 | */ | |
90b30cdc | 2035 | void try_offline_node(int nid) |
60a5a19e | 2036 | { |
2c91f8fc | 2037 | int rc; |
60a5a19e | 2038 | |
2c91f8fc DH |
2039 | /* |
2040 | * If the node still spans pages (especially ZONE_DEVICE), don't | |
2041 | * offline it. A node spans memory after move_pfn_range_to_zone(), | |
2042 | * e.g., after the memory block was onlined. | |
2043 | */ | |
b27340a5 | 2044 | if (node_spanned_pages(nid)) |
2c91f8fc | 2045 | return; |
60a5a19e | 2046 | |
2c91f8fc DH |
2047 | /* |
2048 | * Especially offline memory blocks might not be spanned by the | |
2049 | * node. They will get spanned by the node once they get onlined. | |
2050 | * However, they link to the node in sysfs and can get onlined later. | |
2051 | */ | |
2052 | rc = for_each_memory_block(&nid, check_no_memblock_for_node_cb); | |
2053 | if (rc) | |
60a5a19e | 2054 | return; |
60a5a19e | 2055 | |
b27340a5 | 2056 | if (check_cpu_on_node(nid)) |
60a5a19e TC |
2057 | return; |
2058 | ||
2059 | /* | |
2060 | * all memory/cpu of this node are removed, we can offline this | |
2061 | * node now. | |
2062 | */ | |
2063 | node_set_offline(nid); | |
2064 | unregister_one_node(nid); | |
2065 | } | |
90b30cdc | 2066 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 2067 | |
e1c158e4 | 2068 | static int __ref try_remove_memory(u64 start, u64 size) |
bbc76be6 | 2069 | { |
a08a2ae3 OS |
2070 | struct vmem_altmap mhp_altmap = {}; |
2071 | struct vmem_altmap *altmap = NULL; | |
2072 | unsigned long nr_vmemmap_pages; | |
e1c158e4 | 2073 | int rc = 0, nid = NUMA_NO_NODE; |
993c1aad | 2074 | |
27356f54 TK |
2075 | BUG_ON(check_hotplug_memory_range(start, size)); |
2076 | ||
6677e3ea | 2077 | /* |
242831eb | 2078 | * All memory blocks must be offlined before removing memory. Check |
eca499ab | 2079 | * whether all memory blocks in question are offline and return error |
242831eb | 2080 | * if this is not the case. |
e1c158e4 DH |
2081 | * |
2082 | * While at it, determine the nid. Note that if we'd have mixed nodes, | |
2083 | * we'd only try to offline the last determined one -- which is good | |
2084 | * enough for the cases we care about. | |
6677e3ea | 2085 | */ |
e1c158e4 | 2086 | rc = walk_memory_blocks(start, size, &nid, check_memblock_offlined_cb); |
eca499ab | 2087 | if (rc) |
b4223a51 | 2088 | return rc; |
6677e3ea | 2089 | |
a08a2ae3 OS |
2090 | /* |
2091 | * We only support removing memory added with MHP_MEMMAP_ON_MEMORY in | |
2092 | * the same granularity it was added - a single memory block. | |
2093 | */ | |
6e02c46b | 2094 | if (mhp_memmap_on_memory()) { |
a08a2ae3 OS |
2095 | nr_vmemmap_pages = walk_memory_blocks(start, size, NULL, |
2096 | get_nr_vmemmap_pages_cb); | |
2097 | if (nr_vmemmap_pages) { | |
2098 | if (size != memory_block_size_bytes()) { | |
2099 | pr_warn("Refuse to remove %#llx - %#llx," | |
2100 | "wrong granularity\n", | |
2101 | start, start + size); | |
2102 | return -EINVAL; | |
2103 | } | |
2104 | ||
2105 | /* | |
2106 | * Let remove_pmd_table->free_hugepage_table do the | |
2107 | * right thing if we used vmem_altmap when hot-adding | |
2108 | * the range. | |
2109 | */ | |
2110 | mhp_altmap.alloc = nr_vmemmap_pages; | |
2111 | altmap = &mhp_altmap; | |
2112 | } | |
2113 | } | |
2114 | ||
46c66c4b YI |
2115 | /* remove memmap entry */ |
2116 | firmware_map_remove(start, start + size, "System RAM"); | |
4c4b7f9b | 2117 | |
f1037ec0 DW |
2118 | /* |
2119 | * Memory block device removal under the device_hotplug_lock is | |
2120 | * a barrier against racing online attempts. | |
2121 | */ | |
4c4b7f9b | 2122 | remove_memory_block_devices(start, size); |
46c66c4b | 2123 | |
f1037ec0 DW |
2124 | mem_hotplug_begin(); |
2125 | ||
65a2aa5f | 2126 | arch_remove_memory(start, size, altmap); |
52219aea DH |
2127 | |
2128 | if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) { | |
3ecc6834 | 2129 | memblock_phys_free(start, size); |
52219aea DH |
2130 | memblock_remove(start, size); |
2131 | } | |
2132 | ||
cb8e3c8b | 2133 | release_mem_region_adjustable(start, size); |
24d335ca | 2134 | |
e1c158e4 DH |
2135 | if (nid != NUMA_NO_NODE) |
2136 | try_offline_node(nid); | |
60a5a19e | 2137 | |
bfc8c901 | 2138 | mem_hotplug_done(); |
b4223a51 | 2139 | return 0; |
71088785 | 2140 | } |
d15e5926 | 2141 | |
eca499ab | 2142 | /** |
5640c9ca | 2143 | * __remove_memory - Remove memory if every memory block is offline |
eca499ab PT |
2144 | * @start: physical address of the region to remove |
2145 | * @size: size of the region to remove | |
2146 | * | |
2147 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
2148 | * and online/offline operations before this call, as required by | |
2149 | * try_offline_node(). | |
2150 | */ | |
e1c158e4 | 2151 | void __remove_memory(u64 start, u64 size) |
eca499ab PT |
2152 | { |
2153 | ||
2154 | /* | |
29a90db9 | 2155 | * trigger BUG() if some memory is not offlined prior to calling this |
eca499ab PT |
2156 | * function |
2157 | */ | |
e1c158e4 | 2158 | if (try_remove_memory(start, size)) |
eca499ab PT |
2159 | BUG(); |
2160 | } | |
2161 | ||
2162 | /* | |
2163 | * Remove memory if every memory block is offline, otherwise return -EBUSY is | |
2164 | * some memory is not offline | |
2165 | */ | |
e1c158e4 | 2166 | int remove_memory(u64 start, u64 size) |
d15e5926 | 2167 | { |
eca499ab PT |
2168 | int rc; |
2169 | ||
d15e5926 | 2170 | lock_device_hotplug(); |
e1c158e4 | 2171 | rc = try_remove_memory(start, size); |
d15e5926 | 2172 | unlock_device_hotplug(); |
eca499ab PT |
2173 | |
2174 | return rc; | |
d15e5926 | 2175 | } |
71088785 | 2176 | EXPORT_SYMBOL_GPL(remove_memory); |
08b3acd7 | 2177 | |
8dc4bb58 DH |
2178 | static int try_offline_memory_block(struct memory_block *mem, void *arg) |
2179 | { | |
2180 | uint8_t online_type = MMOP_ONLINE_KERNEL; | |
2181 | uint8_t **online_types = arg; | |
2182 | struct page *page; | |
2183 | int rc; | |
2184 | ||
2185 | /* | |
2186 | * Sense the online_type via the zone of the memory block. Offlining | |
2187 | * with multiple zones within one memory block will be rejected | |
2188 | * by offlining code ... so we don't care about that. | |
2189 | */ | |
2190 | page = pfn_to_online_page(section_nr_to_pfn(mem->start_section_nr)); | |
2191 | if (page && zone_idx(page_zone(page)) == ZONE_MOVABLE) | |
2192 | online_type = MMOP_ONLINE_MOVABLE; | |
2193 | ||
2194 | rc = device_offline(&mem->dev); | |
2195 | /* | |
2196 | * Default is MMOP_OFFLINE - change it only if offlining succeeded, | |
2197 | * so try_reonline_memory_block() can do the right thing. | |
2198 | */ | |
2199 | if (!rc) | |
2200 | **online_types = online_type; | |
2201 | ||
2202 | (*online_types)++; | |
2203 | /* Ignore if already offline. */ | |
2204 | return rc < 0 ? rc : 0; | |
2205 | } | |
2206 | ||
2207 | static int try_reonline_memory_block(struct memory_block *mem, void *arg) | |
2208 | { | |
2209 | uint8_t **online_types = arg; | |
2210 | int rc; | |
2211 | ||
2212 | if (**online_types != MMOP_OFFLINE) { | |
2213 | mem->online_type = **online_types; | |
2214 | rc = device_online(&mem->dev); | |
2215 | if (rc < 0) | |
2216 | pr_warn("%s: Failed to re-online memory: %d", | |
2217 | __func__, rc); | |
2218 | } | |
2219 | ||
2220 | /* Continue processing all remaining memory blocks. */ | |
2221 | (*online_types)++; | |
2222 | return 0; | |
2223 | } | |
2224 | ||
08b3acd7 | 2225 | /* |
8dc4bb58 DH |
2226 | * Try to offline and remove memory. Might take a long time to finish in case |
2227 | * memory is still in use. Primarily useful for memory devices that logically | |
2228 | * unplugged all memory (so it's no longer in use) and want to offline + remove | |
2229 | * that memory. | |
08b3acd7 | 2230 | */ |
e1c158e4 | 2231 | int offline_and_remove_memory(u64 start, u64 size) |
08b3acd7 | 2232 | { |
8dc4bb58 DH |
2233 | const unsigned long mb_count = size / memory_block_size_bytes(); |
2234 | uint8_t *online_types, *tmp; | |
2235 | int rc; | |
08b3acd7 DH |
2236 | |
2237 | if (!IS_ALIGNED(start, memory_block_size_bytes()) || | |
8dc4bb58 DH |
2238 | !IS_ALIGNED(size, memory_block_size_bytes()) || !size) |
2239 | return -EINVAL; | |
2240 | ||
2241 | /* | |
2242 | * We'll remember the old online type of each memory block, so we can | |
2243 | * try to revert whatever we did when offlining one memory block fails | |
2244 | * after offlining some others succeeded. | |
2245 | */ | |
2246 | online_types = kmalloc_array(mb_count, sizeof(*online_types), | |
2247 | GFP_KERNEL); | |
2248 | if (!online_types) | |
2249 | return -ENOMEM; | |
2250 | /* | |
2251 | * Initialize all states to MMOP_OFFLINE, so when we abort processing in | |
2252 | * try_offline_memory_block(), we'll skip all unprocessed blocks in | |
2253 | * try_reonline_memory_block(). | |
2254 | */ | |
2255 | memset(online_types, MMOP_OFFLINE, mb_count); | |
08b3acd7 DH |
2256 | |
2257 | lock_device_hotplug(); | |
8dc4bb58 DH |
2258 | |
2259 | tmp = online_types; | |
2260 | rc = walk_memory_blocks(start, size, &tmp, try_offline_memory_block); | |
08b3acd7 DH |
2261 | |
2262 | /* | |
8dc4bb58 | 2263 | * In case we succeeded to offline all memory, remove it. |
08b3acd7 DH |
2264 | * This cannot fail as it cannot get onlined in the meantime. |
2265 | */ | |
2266 | if (!rc) { | |
e1c158e4 | 2267 | rc = try_remove_memory(start, size); |
8dc4bb58 DH |
2268 | if (rc) |
2269 | pr_err("%s: Failed to remove memory: %d", __func__, rc); | |
2270 | } | |
2271 | ||
2272 | /* | |
2273 | * Rollback what we did. While memory onlining might theoretically fail | |
2274 | * (nacked by a notifier), it barely ever happens. | |
2275 | */ | |
2276 | if (rc) { | |
2277 | tmp = online_types; | |
2278 | walk_memory_blocks(start, size, &tmp, | |
2279 | try_reonline_memory_block); | |
08b3acd7 DH |
2280 | } |
2281 | unlock_device_hotplug(); | |
2282 | ||
8dc4bb58 | 2283 | kfree(online_types); |
08b3acd7 DH |
2284 | return rc; |
2285 | } | |
2286 | EXPORT_SYMBOL_GPL(offline_and_remove_memory); | |
aba6efc4 | 2287 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |