13947be19SDave Hansen /* 23947be19SDave Hansen * linux/mm/memory_hotplug.c 33947be19SDave Hansen * 43947be19SDave Hansen * Copyright (C) 53947be19SDave Hansen */ 63947be19SDave Hansen 73947be19SDave Hansen #include <linux/stddef.h> 83947be19SDave Hansen #include <linux/mm.h> 9174cd4b1SIngo Molnar #include <linux/sched/signal.h> 103947be19SDave Hansen #include <linux/swap.h> 113947be19SDave Hansen #include <linux/interrupt.h> 123947be19SDave Hansen #include <linux/pagemap.h> 133947be19SDave Hansen #include <linux/compiler.h> 14b95f1b31SPaul Gortmaker #include <linux/export.h> 153947be19SDave Hansen #include <linux/pagevec.h> 162d1d43f6SChandra Seetharaman #include <linux/writeback.h> 173947be19SDave Hansen #include <linux/slab.h> 183947be19SDave Hansen #include <linux/sysctl.h> 193947be19SDave Hansen #include <linux/cpu.h> 203947be19SDave Hansen #include <linux/memory.h> 214b94ffdcSDan Williams #include <linux/memremap.h> 223947be19SDave Hansen #include <linux/memory_hotplug.h> 233947be19SDave Hansen #include <linux/highmem.h> 243947be19SDave Hansen #include <linux/vmalloc.h> 250a547039SKAMEZAWA Hiroyuki #include <linux/ioport.h> 260c0e6195SKAMEZAWA Hiroyuki #include <linux/delay.h> 270c0e6195SKAMEZAWA Hiroyuki #include <linux/migrate.h> 280c0e6195SKAMEZAWA Hiroyuki #include <linux/page-isolation.h> 2971088785SBadari Pulavarty #include <linux/pfn.h> 306ad696d2SAndi Kleen #include <linux/suspend.h> 316d9c285aSKOSAKI Motohiro #include <linux/mm_inline.h> 32d96ae530Sakpm@linux-foundation.org #include <linux/firmware-map.h> 3360a5a19eSTang Chen #include <linux/stop_machine.h> 34c8721bbbSNaoya Horiguchi #include <linux/hugetlb.h> 35c5320926STang Chen #include <linux/memblock.h> 36698b1b30SVlastimil Babka #include <linux/compaction.h> 37b15c8726SMichal Hocko #include <linux/rmap.h> 383947be19SDave Hansen 393947be19SDave Hansen #include <asm/tlbflush.h> 403947be19SDave Hansen 411e5ad9a3SAdrian Bunk #include "internal.h" 42*e900a918SDan Williams #include "shuffle.h" 431e5ad9a3SAdrian Bunk 449d0ad8caSDaniel Kiper /* 459d0ad8caSDaniel Kiper * online_page_callback contains pointer to current page onlining function. 469d0ad8caSDaniel Kiper * Initially it is generic_online_page(). If it is required it could be 479d0ad8caSDaniel Kiper * changed by calling set_online_page_callback() for callback registration 489d0ad8caSDaniel Kiper * and restore_online_page_callback() for generic callback restore. 499d0ad8caSDaniel Kiper */ 509d0ad8caSDaniel Kiper 51a9cd410aSArun KS static void generic_online_page(struct page *page, unsigned int order); 529d0ad8caSDaniel Kiper 539d0ad8caSDaniel Kiper static online_page_callback_t online_page_callback = generic_online_page; 54bfc8c901SVladimir Davydov static DEFINE_MUTEX(online_page_callback_lock); 559d0ad8caSDaniel Kiper 563f906ba2SThomas Gleixner DEFINE_STATIC_PERCPU_RWSEM(mem_hotplug_lock); 5720d6c96bSKOSAKI Motohiro 583f906ba2SThomas Gleixner void get_online_mems(void) 593f906ba2SThomas Gleixner { 603f906ba2SThomas Gleixner percpu_down_read(&mem_hotplug_lock); 613f906ba2SThomas Gleixner } 62bfc8c901SVladimir Davydov 633f906ba2SThomas Gleixner void put_online_mems(void) 643f906ba2SThomas Gleixner { 653f906ba2SThomas Gleixner percpu_up_read(&mem_hotplug_lock); 663f906ba2SThomas Gleixner } 67bfc8c901SVladimir Davydov 684932381eSMichal Hocko bool movable_node_enabled = false; 694932381eSMichal Hocko 708604d9e5SVitaly Kuznetsov #ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE 7131bc3858SVitaly Kuznetsov bool memhp_auto_online; 728604d9e5SVitaly Kuznetsov #else 738604d9e5SVitaly Kuznetsov bool memhp_auto_online = true; 748604d9e5SVitaly Kuznetsov #endif 7531bc3858SVitaly Kuznetsov EXPORT_SYMBOL_GPL(memhp_auto_online); 7631bc3858SVitaly Kuznetsov 7786dd995dSVitaly Kuznetsov static int __init setup_memhp_default_state(char *str) 7886dd995dSVitaly Kuznetsov { 7986dd995dSVitaly Kuznetsov if (!strcmp(str, "online")) 8086dd995dSVitaly Kuznetsov memhp_auto_online = true; 8186dd995dSVitaly Kuznetsov else if (!strcmp(str, "offline")) 8286dd995dSVitaly Kuznetsov memhp_auto_online = false; 8386dd995dSVitaly Kuznetsov 8486dd995dSVitaly Kuznetsov return 1; 8586dd995dSVitaly Kuznetsov } 8686dd995dSVitaly Kuznetsov __setup("memhp_default_state=", setup_memhp_default_state); 8786dd995dSVitaly Kuznetsov 8830467e0bSDavid Rientjes void mem_hotplug_begin(void) 89bfc8c901SVladimir Davydov { 903f906ba2SThomas Gleixner cpus_read_lock(); 913f906ba2SThomas Gleixner percpu_down_write(&mem_hotplug_lock); 92bfc8c901SVladimir Davydov } 93bfc8c901SVladimir Davydov 9430467e0bSDavid Rientjes void mem_hotplug_done(void) 95bfc8c901SVladimir Davydov { 963f906ba2SThomas Gleixner percpu_up_write(&mem_hotplug_lock); 973f906ba2SThomas Gleixner cpus_read_unlock(); 98bfc8c901SVladimir Davydov } 9920d6c96bSKOSAKI Motohiro 100357b4da5SJuergen Gross u64 max_mem_size = U64_MAX; 101357b4da5SJuergen Gross 10245e0b78bSKeith Mannthey /* add this memory to iomem resource */ 10345e0b78bSKeith Mannthey static struct resource *register_memory_resource(u64 start, u64 size) 10445e0b78bSKeith Mannthey { 1052794129eSDave Hansen struct resource *res; 1062794129eSDave Hansen unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 1072794129eSDave Hansen char *resource_name = "System RAM"; 108357b4da5SJuergen Gross 109357b4da5SJuergen Gross if (start + size > max_mem_size) 110357b4da5SJuergen Gross return ERR_PTR(-E2BIG); 111357b4da5SJuergen Gross 1122794129eSDave Hansen /* 1132794129eSDave Hansen * Request ownership of the new memory range. This might be 1142794129eSDave Hansen * a child of an existing resource that was present but 1152794129eSDave Hansen * not marked as busy. 1162794129eSDave Hansen */ 1172794129eSDave Hansen res = __request_region(&iomem_resource, start, size, 1182794129eSDave Hansen resource_name, flags); 11945e0b78bSKeith Mannthey 1202794129eSDave Hansen if (!res) { 1212794129eSDave Hansen pr_debug("Unable to reserve System RAM region: %016llx->%016llx\n", 1222794129eSDave Hansen start, start + size); 1236f754ba4SVitaly Kuznetsov return ERR_PTR(-EEXIST); 12445e0b78bSKeith Mannthey } 12545e0b78bSKeith Mannthey return res; 12645e0b78bSKeith Mannthey } 12745e0b78bSKeith Mannthey 12845e0b78bSKeith Mannthey static void release_memory_resource(struct resource *res) 12945e0b78bSKeith Mannthey { 13045e0b78bSKeith Mannthey if (!res) 13145e0b78bSKeith Mannthey return; 13245e0b78bSKeith Mannthey release_resource(res); 13345e0b78bSKeith Mannthey kfree(res); 13445e0b78bSKeith Mannthey return; 13545e0b78bSKeith Mannthey } 13645e0b78bSKeith Mannthey 13753947027SKeith Mannthey #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 13846723bfaSYasuaki Ishimatsu void get_page_bootmem(unsigned long info, struct page *page, 1395f24ce5fSAndrea Arcangeli unsigned long type) 14004753278SYasunori Goto { 141ddffe98dSYasuaki Ishimatsu page->freelist = (void *)type; 14204753278SYasunori Goto SetPagePrivate(page); 14304753278SYasunori Goto set_page_private(page, info); 144fe896d18SJoonsoo Kim page_ref_inc(page); 14504753278SYasunori Goto } 14604753278SYasunori Goto 147170a5a7eSJiang Liu void put_page_bootmem(struct page *page) 14804753278SYasunori Goto { 1495f24ce5fSAndrea Arcangeli unsigned long type; 15004753278SYasunori Goto 151ddffe98dSYasuaki Ishimatsu type = (unsigned long) page->freelist; 1525f24ce5fSAndrea Arcangeli BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || 1535f24ce5fSAndrea Arcangeli type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); 15404753278SYasunori Goto 155fe896d18SJoonsoo Kim if (page_ref_dec_return(page) == 1) { 156ddffe98dSYasuaki Ishimatsu page->freelist = NULL; 15704753278SYasunori Goto ClearPagePrivate(page); 15804753278SYasunori Goto set_page_private(page, 0); 1595f24ce5fSAndrea Arcangeli INIT_LIST_HEAD(&page->lru); 160170a5a7eSJiang Liu free_reserved_page(page); 16104753278SYasunori Goto } 16204753278SYasunori Goto } 16304753278SYasunori Goto 16446723bfaSYasuaki Ishimatsu #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE 16546723bfaSYasuaki Ishimatsu #ifndef CONFIG_SPARSEMEM_VMEMMAP 166d92bc318SAdrian Bunk static void register_page_bootmem_info_section(unsigned long start_pfn) 16704753278SYasunori Goto { 16804753278SYasunori Goto unsigned long *usemap, mapsize, section_nr, i; 16904753278SYasunori Goto struct mem_section *ms; 17004753278SYasunori Goto struct page *page, *memmap; 17104753278SYasunori Goto 17204753278SYasunori Goto section_nr = pfn_to_section_nr(start_pfn); 17304753278SYasunori Goto ms = __nr_to_section(section_nr); 17404753278SYasunori Goto 17504753278SYasunori Goto /* Get section's memmap address */ 17604753278SYasunori Goto memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); 17704753278SYasunori Goto 17804753278SYasunori Goto /* 17904753278SYasunori Goto * Get page for the memmap's phys address 18004753278SYasunori Goto * XXX: need more consideration for sparse_vmemmap... 18104753278SYasunori Goto */ 18204753278SYasunori Goto page = virt_to_page(memmap); 18304753278SYasunori Goto mapsize = sizeof(struct page) * PAGES_PER_SECTION; 18404753278SYasunori Goto mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; 18504753278SYasunori Goto 18604753278SYasunori Goto /* remember memmap's page */ 18704753278SYasunori Goto for (i = 0; i < mapsize; i++, page++) 18804753278SYasunori Goto get_page_bootmem(section_nr, page, SECTION_INFO); 18904753278SYasunori Goto 1909ac9322dSOscar Salvador usemap = ms->pageblock_flags; 19104753278SYasunori Goto page = virt_to_page(usemap); 19204753278SYasunori Goto 19304753278SYasunori Goto mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; 19404753278SYasunori Goto 19504753278SYasunori Goto for (i = 0; i < mapsize; i++, page++) 196af370fb8SYasunori Goto get_page_bootmem(section_nr, page, MIX_SECTION_INFO); 19704753278SYasunori Goto 19804753278SYasunori Goto } 19946723bfaSYasuaki Ishimatsu #else /* CONFIG_SPARSEMEM_VMEMMAP */ 20046723bfaSYasuaki Ishimatsu static void register_page_bootmem_info_section(unsigned long start_pfn) 20146723bfaSYasuaki Ishimatsu { 20246723bfaSYasuaki Ishimatsu unsigned long *usemap, mapsize, section_nr, i; 20346723bfaSYasuaki Ishimatsu struct mem_section *ms; 20446723bfaSYasuaki Ishimatsu struct page *page, *memmap; 20546723bfaSYasuaki Ishimatsu 20646723bfaSYasuaki Ishimatsu section_nr = pfn_to_section_nr(start_pfn); 20746723bfaSYasuaki Ishimatsu ms = __nr_to_section(section_nr); 20846723bfaSYasuaki Ishimatsu 20946723bfaSYasuaki Ishimatsu memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); 21046723bfaSYasuaki Ishimatsu 21146723bfaSYasuaki Ishimatsu register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); 21246723bfaSYasuaki Ishimatsu 2139ac9322dSOscar Salvador usemap = ms->pageblock_flags; 21446723bfaSYasuaki Ishimatsu page = virt_to_page(usemap); 21546723bfaSYasuaki Ishimatsu 21646723bfaSYasuaki Ishimatsu mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; 21746723bfaSYasuaki Ishimatsu 21846723bfaSYasuaki Ishimatsu for (i = 0; i < mapsize; i++, page++) 21946723bfaSYasuaki Ishimatsu get_page_bootmem(section_nr, page, MIX_SECTION_INFO); 22046723bfaSYasuaki Ishimatsu } 22146723bfaSYasuaki Ishimatsu #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ 22204753278SYasunori Goto 2237ded384aSLinus Torvalds void __init register_page_bootmem_info_node(struct pglist_data *pgdat) 22404753278SYasunori Goto { 22504753278SYasunori Goto unsigned long i, pfn, end_pfn, nr_pages; 22604753278SYasunori Goto int node = pgdat->node_id; 22704753278SYasunori Goto struct page *page; 22804753278SYasunori Goto 22904753278SYasunori Goto nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; 23004753278SYasunori Goto page = virt_to_page(pgdat); 23104753278SYasunori Goto 23204753278SYasunori Goto for (i = 0; i < nr_pages; i++, page++) 23304753278SYasunori Goto get_page_bootmem(node, page, NODE_INFO); 23404753278SYasunori Goto 23504753278SYasunori Goto pfn = pgdat->node_start_pfn; 236c1f19495SCody P Schafer end_pfn = pgdat_end_pfn(pgdat); 23704753278SYasunori Goto 2387e9f5eb0STang Chen /* register section info */ 239f14851afSqiuxishi for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { 240f14851afSqiuxishi /* 241f14851afSqiuxishi * Some platforms can assign the same pfn to multiple nodes - on 242f14851afSqiuxishi * node0 as well as nodeN. To avoid registering a pfn against 243f14851afSqiuxishi * multiple nodes we check that this pfn does not already 2447e9f5eb0STang Chen * reside in some other nodes. 245f14851afSqiuxishi */ 246f65e91dfSYang Shi if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node)) 24704753278SYasunori Goto register_page_bootmem_info_section(pfn); 248f14851afSqiuxishi } 24904753278SYasunori Goto } 25046723bfaSYasuaki Ishimatsu #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */ 25104753278SYasunori Goto 252f1dd2cd1SMichal Hocko static int __meminit __add_section(int nid, unsigned long phys_start_pfn, 2537b73d978SChristoph Hellwig struct vmem_altmap *altmap, bool want_memblock) 2543947be19SDave Hansen { 2553947be19SDave Hansen int ret; 2563947be19SDave Hansen 257ebd15302SKAMEZAWA Hiroyuki if (pfn_valid(phys_start_pfn)) 258ebd15302SKAMEZAWA Hiroyuki return -EEXIST; 259ebd15302SKAMEZAWA Hiroyuki 2604e0d2e7eSWei Yang ret = sparse_add_one_section(nid, phys_start_pfn, altmap); 2613947be19SDave Hansen if (ret < 0) 2623947be19SDave Hansen return ret; 2633947be19SDave Hansen 2641b862aecSMichal Hocko if (!want_memblock) 2651b862aecSMichal Hocko return 0; 2661b862aecSMichal Hocko 267fc44f7f9SPavel Tatashin return hotplug_memory_register(nid, __pfn_to_section(phys_start_pfn)); 2683947be19SDave Hansen } 2693947be19SDave Hansen 2704edd7cefSDavid Rientjes /* 2714edd7cefSDavid Rientjes * Reasonably generic function for adding memory. It is 2724edd7cefSDavid Rientjes * expected that archs that support memory hotplug will 2734edd7cefSDavid Rientjes * call this function after deciding the zone to which to 2744edd7cefSDavid Rientjes * add the new pages. 2754edd7cefSDavid Rientjes */ 276f1dd2cd1SMichal Hocko int __ref __add_pages(int nid, unsigned long phys_start_pfn, 277940519f0SMichal Hocko unsigned long nr_pages, struct mhp_restrictions *restrictions) 2784edd7cefSDavid Rientjes { 2794edd7cefSDavid Rientjes unsigned long i; 2804edd7cefSDavid Rientjes int err = 0; 2814edd7cefSDavid Rientjes int start_sec, end_sec; 282940519f0SMichal Hocko struct vmem_altmap *altmap = restrictions->altmap; 2834b94ffdcSDan Williams 2844edd7cefSDavid Rientjes /* during initialize mem_map, align hot-added range to section */ 2854edd7cefSDavid Rientjes start_sec = pfn_to_section_nr(phys_start_pfn); 2864edd7cefSDavid Rientjes end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); 2874edd7cefSDavid Rientjes 2884b94ffdcSDan Williams if (altmap) { 2894b94ffdcSDan Williams /* 2904b94ffdcSDan Williams * Validate altmap is within bounds of the total request 2914b94ffdcSDan Williams */ 2924b94ffdcSDan Williams if (altmap->base_pfn != phys_start_pfn 2934b94ffdcSDan Williams || vmem_altmap_offset(altmap) > nr_pages) { 2944b94ffdcSDan Williams pr_warn_once("memory add fail, invalid altmap\n"); 2957cf91a98SJoonsoo Kim err = -EINVAL; 2967cf91a98SJoonsoo Kim goto out; 2974b94ffdcSDan Williams } 2984b94ffdcSDan Williams altmap->alloc = 0; 2994b94ffdcSDan Williams } 3004b94ffdcSDan Williams 3014edd7cefSDavid Rientjes for (i = start_sec; i <= end_sec; i++) { 3027b73d978SChristoph Hellwig err = __add_section(nid, section_nr_to_pfn(i), altmap, 303940519f0SMichal Hocko restrictions->flags & MHP_MEMBLOCK_API); 3044edd7cefSDavid Rientjes 3054edd7cefSDavid Rientjes /* 3064edd7cefSDavid Rientjes * EEXIST is finally dealt with by ioresource collision 3074edd7cefSDavid Rientjes * check. see add_memory() => register_memory_resource() 3084edd7cefSDavid Rientjes * Warning will be printed if there is collision. 3094edd7cefSDavid Rientjes */ 3104edd7cefSDavid Rientjes if (err && (err != -EEXIST)) 3114edd7cefSDavid Rientjes break; 3124edd7cefSDavid Rientjes err = 0; 313f64ac5e6SMichal Hocko cond_resched(); 3144edd7cefSDavid Rientjes } 315c435a390SZhu Guihua vmemmap_populate_print_last(); 3167cf91a98SJoonsoo Kim out: 3174edd7cefSDavid Rientjes return err; 3184edd7cefSDavid Rientjes } 3194edd7cefSDavid Rientjes 3204edd7cefSDavid Rientjes #ifdef CONFIG_MEMORY_HOTREMOVE 321815121d2SYasuaki Ishimatsu /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ 322d09b0137SYASUAKI ISHIMATSU static unsigned long find_smallest_section_pfn(int nid, struct zone *zone, 323815121d2SYasuaki Ishimatsu unsigned long start_pfn, 324815121d2SYasuaki Ishimatsu unsigned long end_pfn) 325815121d2SYasuaki Ishimatsu { 326815121d2SYasuaki Ishimatsu struct mem_section *ms; 327815121d2SYasuaki Ishimatsu 328815121d2SYasuaki Ishimatsu for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) { 329815121d2SYasuaki Ishimatsu ms = __pfn_to_section(start_pfn); 330815121d2SYasuaki Ishimatsu 331815121d2SYasuaki Ishimatsu if (unlikely(!valid_section(ms))) 332815121d2SYasuaki Ishimatsu continue; 333815121d2SYasuaki Ishimatsu 334815121d2SYasuaki Ishimatsu if (unlikely(pfn_to_nid(start_pfn) != nid)) 335815121d2SYasuaki Ishimatsu continue; 336815121d2SYasuaki Ishimatsu 337815121d2SYasuaki Ishimatsu if (zone && zone != page_zone(pfn_to_page(start_pfn))) 338815121d2SYasuaki Ishimatsu continue; 339815121d2SYasuaki Ishimatsu 340815121d2SYasuaki Ishimatsu return start_pfn; 341815121d2SYasuaki Ishimatsu } 342815121d2SYasuaki Ishimatsu 343815121d2SYasuaki Ishimatsu return 0; 344815121d2SYasuaki Ishimatsu } 345815121d2SYasuaki Ishimatsu 346815121d2SYasuaki Ishimatsu /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ 347d09b0137SYASUAKI ISHIMATSU static unsigned long find_biggest_section_pfn(int nid, struct zone *zone, 348815121d2SYasuaki Ishimatsu unsigned long start_pfn, 349815121d2SYasuaki Ishimatsu unsigned long end_pfn) 350815121d2SYasuaki Ishimatsu { 351815121d2SYasuaki Ishimatsu struct mem_section *ms; 352815121d2SYasuaki Ishimatsu unsigned long pfn; 353815121d2SYasuaki Ishimatsu 354815121d2SYasuaki Ishimatsu /* pfn is the end pfn of a memory section. */ 355815121d2SYasuaki Ishimatsu pfn = end_pfn - 1; 356815121d2SYasuaki Ishimatsu for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) { 357815121d2SYasuaki Ishimatsu ms = __pfn_to_section(pfn); 358815121d2SYasuaki Ishimatsu 359815121d2SYasuaki Ishimatsu if (unlikely(!valid_section(ms))) 360815121d2SYasuaki Ishimatsu continue; 361815121d2SYasuaki Ishimatsu 362815121d2SYasuaki Ishimatsu if (unlikely(pfn_to_nid(pfn) != nid)) 363815121d2SYasuaki Ishimatsu continue; 364815121d2SYasuaki Ishimatsu 365815121d2SYasuaki Ishimatsu if (zone && zone != page_zone(pfn_to_page(pfn))) 366815121d2SYasuaki Ishimatsu continue; 367815121d2SYasuaki Ishimatsu 368815121d2SYasuaki Ishimatsu return pfn; 369815121d2SYasuaki Ishimatsu } 370815121d2SYasuaki Ishimatsu 371815121d2SYasuaki Ishimatsu return 0; 372815121d2SYasuaki Ishimatsu } 373815121d2SYasuaki Ishimatsu 374815121d2SYasuaki Ishimatsu static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, 375815121d2SYasuaki Ishimatsu unsigned long end_pfn) 376815121d2SYasuaki Ishimatsu { 377815121d2SYasuaki Ishimatsu unsigned long zone_start_pfn = zone->zone_start_pfn; 378c33bc315SXishi Qiu unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */ 379c33bc315SXishi Qiu unsigned long zone_end_pfn = z; 380815121d2SYasuaki Ishimatsu unsigned long pfn; 381815121d2SYasuaki Ishimatsu struct mem_section *ms; 382815121d2SYasuaki Ishimatsu int nid = zone_to_nid(zone); 383815121d2SYasuaki Ishimatsu 384815121d2SYasuaki Ishimatsu zone_span_writelock(zone); 385815121d2SYasuaki Ishimatsu if (zone_start_pfn == start_pfn) { 386815121d2SYasuaki Ishimatsu /* 387815121d2SYasuaki Ishimatsu * If the section is smallest section in the zone, it need 388815121d2SYasuaki Ishimatsu * shrink zone->zone_start_pfn and zone->zone_spanned_pages. 389815121d2SYasuaki Ishimatsu * In this case, we find second smallest valid mem_section 390815121d2SYasuaki Ishimatsu * for shrinking zone. 391815121d2SYasuaki Ishimatsu */ 392815121d2SYasuaki Ishimatsu pfn = find_smallest_section_pfn(nid, zone, end_pfn, 393815121d2SYasuaki Ishimatsu zone_end_pfn); 394815121d2SYasuaki Ishimatsu if (pfn) { 395815121d2SYasuaki Ishimatsu zone->zone_start_pfn = pfn; 396815121d2SYasuaki Ishimatsu zone->spanned_pages = zone_end_pfn - pfn; 397815121d2SYasuaki Ishimatsu } 398815121d2SYasuaki Ishimatsu } else if (zone_end_pfn == end_pfn) { 399815121d2SYasuaki Ishimatsu /* 400815121d2SYasuaki Ishimatsu * If the section is biggest section in the zone, it need 401815121d2SYasuaki Ishimatsu * shrink zone->spanned_pages. 402815121d2SYasuaki Ishimatsu * In this case, we find second biggest valid mem_section for 403815121d2SYasuaki Ishimatsu * shrinking zone. 404815121d2SYasuaki Ishimatsu */ 405815121d2SYasuaki Ishimatsu pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn, 406815121d2SYasuaki Ishimatsu start_pfn); 407815121d2SYasuaki Ishimatsu if (pfn) 408815121d2SYasuaki Ishimatsu zone->spanned_pages = pfn - zone_start_pfn + 1; 409815121d2SYasuaki Ishimatsu } 410815121d2SYasuaki Ishimatsu 411815121d2SYasuaki Ishimatsu /* 412815121d2SYasuaki Ishimatsu * The section is not biggest or smallest mem_section in the zone, it 413815121d2SYasuaki Ishimatsu * only creates a hole in the zone. So in this case, we need not 414815121d2SYasuaki Ishimatsu * change the zone. But perhaps, the zone has only hole data. Thus 415815121d2SYasuaki Ishimatsu * it check the zone has only hole or not. 416815121d2SYasuaki Ishimatsu */ 417815121d2SYasuaki Ishimatsu pfn = zone_start_pfn; 418815121d2SYasuaki Ishimatsu for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) { 419815121d2SYasuaki Ishimatsu ms = __pfn_to_section(pfn); 420815121d2SYasuaki Ishimatsu 421815121d2SYasuaki Ishimatsu if (unlikely(!valid_section(ms))) 422815121d2SYasuaki Ishimatsu continue; 423815121d2SYasuaki Ishimatsu 424815121d2SYasuaki Ishimatsu if (page_zone(pfn_to_page(pfn)) != zone) 425815121d2SYasuaki Ishimatsu continue; 426815121d2SYasuaki Ishimatsu 427815121d2SYasuaki Ishimatsu /* If the section is current section, it continues the loop */ 428815121d2SYasuaki Ishimatsu if (start_pfn == pfn) 429815121d2SYasuaki Ishimatsu continue; 430815121d2SYasuaki Ishimatsu 431815121d2SYasuaki Ishimatsu /* If we find valid section, we have nothing to do */ 432815121d2SYasuaki Ishimatsu zone_span_writeunlock(zone); 433815121d2SYasuaki Ishimatsu return; 434815121d2SYasuaki Ishimatsu } 435815121d2SYasuaki Ishimatsu 436815121d2SYasuaki Ishimatsu /* The zone has no valid section */ 437815121d2SYasuaki Ishimatsu zone->zone_start_pfn = 0; 438815121d2SYasuaki Ishimatsu zone->spanned_pages = 0; 439815121d2SYasuaki Ishimatsu zone_span_writeunlock(zone); 440815121d2SYasuaki Ishimatsu } 441815121d2SYasuaki Ishimatsu 442815121d2SYasuaki Ishimatsu static void shrink_pgdat_span(struct pglist_data *pgdat, 443815121d2SYasuaki Ishimatsu unsigned long start_pfn, unsigned long end_pfn) 444815121d2SYasuaki Ishimatsu { 445815121d2SYasuaki Ishimatsu unsigned long pgdat_start_pfn = pgdat->node_start_pfn; 44683285c72SXishi Qiu unsigned long p = pgdat_end_pfn(pgdat); /* pgdat_end_pfn namespace clash */ 44783285c72SXishi Qiu unsigned long pgdat_end_pfn = p; 448815121d2SYasuaki Ishimatsu unsigned long pfn; 449815121d2SYasuaki Ishimatsu struct mem_section *ms; 450815121d2SYasuaki Ishimatsu int nid = pgdat->node_id; 451815121d2SYasuaki Ishimatsu 452815121d2SYasuaki Ishimatsu if (pgdat_start_pfn == start_pfn) { 453815121d2SYasuaki Ishimatsu /* 454815121d2SYasuaki Ishimatsu * If the section is smallest section in the pgdat, it need 455815121d2SYasuaki Ishimatsu * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages. 456815121d2SYasuaki Ishimatsu * In this case, we find second smallest valid mem_section 457815121d2SYasuaki Ishimatsu * for shrinking zone. 458815121d2SYasuaki Ishimatsu */ 459815121d2SYasuaki Ishimatsu pfn = find_smallest_section_pfn(nid, NULL, end_pfn, 460815121d2SYasuaki Ishimatsu pgdat_end_pfn); 461815121d2SYasuaki Ishimatsu if (pfn) { 462815121d2SYasuaki Ishimatsu pgdat->node_start_pfn = pfn; 463815121d2SYasuaki Ishimatsu pgdat->node_spanned_pages = pgdat_end_pfn - pfn; 464815121d2SYasuaki Ishimatsu } 465815121d2SYasuaki Ishimatsu } else if (pgdat_end_pfn == end_pfn) { 466815121d2SYasuaki Ishimatsu /* 467815121d2SYasuaki Ishimatsu * If the section is biggest section in the pgdat, it need 468815121d2SYasuaki Ishimatsu * shrink pgdat->node_spanned_pages. 469815121d2SYasuaki Ishimatsu * In this case, we find second biggest valid mem_section for 470815121d2SYasuaki Ishimatsu * shrinking zone. 471815121d2SYasuaki Ishimatsu */ 472815121d2SYasuaki Ishimatsu pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn, 473815121d2SYasuaki Ishimatsu start_pfn); 474815121d2SYasuaki Ishimatsu if (pfn) 475815121d2SYasuaki Ishimatsu pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1; 476815121d2SYasuaki Ishimatsu } 477815121d2SYasuaki Ishimatsu 478815121d2SYasuaki Ishimatsu /* 479815121d2SYasuaki Ishimatsu * If the section is not biggest or smallest mem_section in the pgdat, 480815121d2SYasuaki Ishimatsu * it only creates a hole in the pgdat. So in this case, we need not 481815121d2SYasuaki Ishimatsu * change the pgdat. 482815121d2SYasuaki Ishimatsu * But perhaps, the pgdat has only hole data. Thus it check the pgdat 483815121d2SYasuaki Ishimatsu * has only hole or not. 484815121d2SYasuaki Ishimatsu */ 485815121d2SYasuaki Ishimatsu pfn = pgdat_start_pfn; 486815121d2SYasuaki Ishimatsu for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) { 487815121d2SYasuaki Ishimatsu ms = __pfn_to_section(pfn); 488815121d2SYasuaki Ishimatsu 489815121d2SYasuaki Ishimatsu if (unlikely(!valid_section(ms))) 490815121d2SYasuaki Ishimatsu continue; 491815121d2SYasuaki Ishimatsu 492815121d2SYasuaki Ishimatsu if (pfn_to_nid(pfn) != nid) 493815121d2SYasuaki Ishimatsu continue; 494815121d2SYasuaki Ishimatsu 495815121d2SYasuaki Ishimatsu /* If the section is current section, it continues the loop */ 496815121d2SYasuaki Ishimatsu if (start_pfn == pfn) 497815121d2SYasuaki Ishimatsu continue; 498815121d2SYasuaki Ishimatsu 499815121d2SYasuaki Ishimatsu /* If we find valid section, we have nothing to do */ 500815121d2SYasuaki Ishimatsu return; 501815121d2SYasuaki Ishimatsu } 502815121d2SYasuaki Ishimatsu 503815121d2SYasuaki Ishimatsu /* The pgdat has no valid section */ 504815121d2SYasuaki Ishimatsu pgdat->node_start_pfn = 0; 505815121d2SYasuaki Ishimatsu pgdat->node_spanned_pages = 0; 506815121d2SYasuaki Ishimatsu } 507815121d2SYasuaki Ishimatsu 508815121d2SYasuaki Ishimatsu static void __remove_zone(struct zone *zone, unsigned long start_pfn) 509815121d2SYasuaki Ishimatsu { 510815121d2SYasuaki Ishimatsu struct pglist_data *pgdat = zone->zone_pgdat; 511815121d2SYasuaki Ishimatsu int nr_pages = PAGES_PER_SECTION; 512815121d2SYasuaki Ishimatsu unsigned long flags; 513815121d2SYasuaki Ishimatsu 514815121d2SYasuaki Ishimatsu pgdat_resize_lock(zone->zone_pgdat, &flags); 515815121d2SYasuaki Ishimatsu shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); 516815121d2SYasuaki Ishimatsu shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages); 517815121d2SYasuaki Ishimatsu pgdat_resize_unlock(zone->zone_pgdat, &flags); 518815121d2SYasuaki Ishimatsu } 519815121d2SYasuaki Ishimatsu 5209d1d887dSDavid Hildenbrand static void __remove_section(struct zone *zone, struct mem_section *ms, 5219d1d887dSDavid Hildenbrand unsigned long map_offset, 5229d1d887dSDavid Hildenbrand struct vmem_altmap *altmap) 523ea01ea93SBadari Pulavarty { 524815121d2SYasuaki Ishimatsu unsigned long start_pfn; 525815121d2SYasuaki Ishimatsu int scn_nr; 526ea01ea93SBadari Pulavarty 5279d1d887dSDavid Hildenbrand if (WARN_ON_ONCE(!valid_section(ms))) 5289d1d887dSDavid Hildenbrand return; 529ea01ea93SBadari Pulavarty 530cb7b3a36SDavid Hildenbrand unregister_memory_section(ms); 531ea01ea93SBadari Pulavarty 532815121d2SYasuaki Ishimatsu scn_nr = __section_nr(ms); 5331dd2bfc8SYASUAKI ISHIMATSU start_pfn = section_nr_to_pfn((unsigned long)scn_nr); 534815121d2SYasuaki Ishimatsu __remove_zone(zone, start_pfn); 535815121d2SYasuaki Ishimatsu 53624b6d416SChristoph Hellwig sparse_remove_one_section(zone, ms, map_offset, altmap); 537ea01ea93SBadari Pulavarty } 538ea01ea93SBadari Pulavarty 539ea01ea93SBadari Pulavarty /** 540ea01ea93SBadari Pulavarty * __remove_pages() - remove sections of pages from a zone 541ea01ea93SBadari Pulavarty * @zone: zone from which pages need to be removed 542ea01ea93SBadari Pulavarty * @phys_start_pfn: starting pageframe (must be aligned to start of a section) 543ea01ea93SBadari Pulavarty * @nr_pages: number of pages to remove (must be multiple of section size) 544e8b098fcSMike Rapoport * @altmap: alternative device page map or %NULL if default memmap is used 545ea01ea93SBadari Pulavarty * 546ea01ea93SBadari Pulavarty * Generic helper function to remove section mappings and sysfs entries 547ea01ea93SBadari Pulavarty * for the section of the memory we are removing. Caller needs to make 548ea01ea93SBadari Pulavarty * sure that pages are marked reserved and zones are adjust properly by 549ea01ea93SBadari Pulavarty * calling offline_pages(). 550ea01ea93SBadari Pulavarty */ 551ac5c9426SDavid Hildenbrand void __remove_pages(struct zone *zone, unsigned long phys_start_pfn, 552da024512SChristoph Hellwig unsigned long nr_pages, struct vmem_altmap *altmap) 553ea01ea93SBadari Pulavarty { 554fe74ebb1SToshi Kani unsigned long i; 5554b94ffdcSDan Williams unsigned long map_offset = 0; 5569d1d887dSDavid Hildenbrand int sections_to_remove; 5574b94ffdcSDan Williams 5584b94ffdcSDan Williams /* In the ZONE_DEVICE case device driver owns the memory region */ 5594b94ffdcSDan Williams if (is_dev_zone(zone)) { 5604b94ffdcSDan Williams if (altmap) 5614b94ffdcSDan Williams map_offset = vmem_altmap_offset(altmap); 5624b94ffdcSDan Williams } 563ea01ea93SBadari Pulavarty 5647cf91a98SJoonsoo Kim clear_zone_contiguous(zone); 5657cf91a98SJoonsoo Kim 566ea01ea93SBadari Pulavarty /* 567ea01ea93SBadari Pulavarty * We can only remove entire sections 568ea01ea93SBadari Pulavarty */ 569ea01ea93SBadari Pulavarty BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); 570ea01ea93SBadari Pulavarty BUG_ON(nr_pages % PAGES_PER_SECTION); 571ea01ea93SBadari Pulavarty 572ea01ea93SBadari Pulavarty sections_to_remove = nr_pages / PAGES_PER_SECTION; 573ea01ea93SBadari Pulavarty for (i = 0; i < sections_to_remove; i++) { 574ea01ea93SBadari Pulavarty unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; 5754b94ffdcSDan Williams 576dd33ad7bSMichal Hocko cond_resched(); 5779d1d887dSDavid Hildenbrand __remove_section(zone, __pfn_to_section(pfn), map_offset, 57824b6d416SChristoph Hellwig altmap); 5794b94ffdcSDan Williams map_offset = 0; 580ea01ea93SBadari Pulavarty } 5817cf91a98SJoonsoo Kim 5827cf91a98SJoonsoo Kim set_zone_contiguous(zone); 583ea01ea93SBadari Pulavarty } 5844edd7cefSDavid Rientjes #endif /* CONFIG_MEMORY_HOTREMOVE */ 585ea01ea93SBadari Pulavarty 5869d0ad8caSDaniel Kiper int set_online_page_callback(online_page_callback_t callback) 5879d0ad8caSDaniel Kiper { 5889d0ad8caSDaniel Kiper int rc = -EINVAL; 5899d0ad8caSDaniel Kiper 590bfc8c901SVladimir Davydov get_online_mems(); 591bfc8c901SVladimir Davydov mutex_lock(&online_page_callback_lock); 5929d0ad8caSDaniel Kiper 5939d0ad8caSDaniel Kiper if (online_page_callback == generic_online_page) { 5949d0ad8caSDaniel Kiper online_page_callback = callback; 5959d0ad8caSDaniel Kiper rc = 0; 5969d0ad8caSDaniel Kiper } 5979d0ad8caSDaniel Kiper 598bfc8c901SVladimir Davydov mutex_unlock(&online_page_callback_lock); 599bfc8c901SVladimir Davydov put_online_mems(); 6009d0ad8caSDaniel Kiper 6019d0ad8caSDaniel Kiper return rc; 6029d0ad8caSDaniel Kiper } 6039d0ad8caSDaniel Kiper EXPORT_SYMBOL_GPL(set_online_page_callback); 6049d0ad8caSDaniel Kiper 6059d0ad8caSDaniel Kiper int restore_online_page_callback(online_page_callback_t callback) 6069d0ad8caSDaniel Kiper { 6079d0ad8caSDaniel Kiper int rc = -EINVAL; 6089d0ad8caSDaniel Kiper 609bfc8c901SVladimir Davydov get_online_mems(); 610bfc8c901SVladimir Davydov mutex_lock(&online_page_callback_lock); 6119d0ad8caSDaniel Kiper 6129d0ad8caSDaniel Kiper if (online_page_callback == callback) { 6139d0ad8caSDaniel Kiper online_page_callback = generic_online_page; 6149d0ad8caSDaniel Kiper rc = 0; 6159d0ad8caSDaniel Kiper } 6169d0ad8caSDaniel Kiper 617bfc8c901SVladimir Davydov mutex_unlock(&online_page_callback_lock); 618bfc8c901SVladimir Davydov put_online_mems(); 6199d0ad8caSDaniel Kiper 6209d0ad8caSDaniel Kiper return rc; 6219d0ad8caSDaniel Kiper } 6229d0ad8caSDaniel Kiper EXPORT_SYMBOL_GPL(restore_online_page_callback); 6239d0ad8caSDaniel Kiper 6249d0ad8caSDaniel Kiper void __online_page_set_limits(struct page *page) 625180c06efSJeremy Fitzhardinge { 6269d0ad8caSDaniel Kiper } 6279d0ad8caSDaniel Kiper EXPORT_SYMBOL_GPL(__online_page_set_limits); 6289d0ad8caSDaniel Kiper 6299d0ad8caSDaniel Kiper void __online_page_increment_counters(struct page *page) 6309d0ad8caSDaniel Kiper { 6313dcc0571SJiang Liu adjust_managed_page_count(page, 1); 6329d0ad8caSDaniel Kiper } 6339d0ad8caSDaniel Kiper EXPORT_SYMBOL_GPL(__online_page_increment_counters); 634180c06efSJeremy Fitzhardinge 6359d0ad8caSDaniel Kiper void __online_page_free(struct page *page) 6369d0ad8caSDaniel Kiper { 6373dcc0571SJiang Liu __free_reserved_page(page); 638180c06efSJeremy Fitzhardinge } 6399d0ad8caSDaniel Kiper EXPORT_SYMBOL_GPL(__online_page_free); 6409d0ad8caSDaniel Kiper 641a9cd410aSArun KS static void generic_online_page(struct page *page, unsigned int order) 6429d0ad8caSDaniel Kiper { 643cd02cf1aSQian Cai kernel_map_pages(page, 1 << order, 1); 644a9cd410aSArun KS __free_pages_core(page, order); 645a9cd410aSArun KS totalram_pages_add(1UL << order); 646a9cd410aSArun KS #ifdef CONFIG_HIGHMEM 647a9cd410aSArun KS if (PageHighMem(page)) 648a9cd410aSArun KS totalhigh_pages_add(1UL << order); 649a9cd410aSArun KS #endif 650a9cd410aSArun KS } 651a9cd410aSArun KS 652a9cd410aSArun KS static int online_pages_blocks(unsigned long start, unsigned long nr_pages) 653a9cd410aSArun KS { 654a9cd410aSArun KS unsigned long end = start + nr_pages; 655a9cd410aSArun KS int order, onlined_pages = 0; 656a9cd410aSArun KS 657a9cd410aSArun KS while (start < end) { 658a9cd410aSArun KS order = min(MAX_ORDER - 1, 659a9cd410aSArun KS get_order(PFN_PHYS(end) - PFN_PHYS(start))); 660a9cd410aSArun KS (*online_page_callback)(pfn_to_page(start), order); 661a9cd410aSArun KS 662a9cd410aSArun KS onlined_pages += (1UL << order); 663a9cd410aSArun KS start += (1UL << order); 664a9cd410aSArun KS } 665a9cd410aSArun KS return onlined_pages; 6669d0ad8caSDaniel Kiper } 667180c06efSJeremy Fitzhardinge 66875884fb1SKAMEZAWA Hiroyuki static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, 66975884fb1SKAMEZAWA Hiroyuki void *arg) 6703947be19SDave Hansen { 67175884fb1SKAMEZAWA Hiroyuki unsigned long onlined_pages = *(unsigned long *)arg; 6722d070eabSMichal Hocko 67375884fb1SKAMEZAWA Hiroyuki if (PageReserved(pfn_to_page(start_pfn))) 674a9cd410aSArun KS onlined_pages += online_pages_blocks(start_pfn, nr_pages); 6752d070eabSMichal Hocko 6762d070eabSMichal Hocko online_mem_sections(start_pfn, start_pfn + nr_pages); 6772d070eabSMichal Hocko 67875884fb1SKAMEZAWA Hiroyuki *(unsigned long *)arg = onlined_pages; 67975884fb1SKAMEZAWA Hiroyuki return 0; 68075884fb1SKAMEZAWA Hiroyuki } 68175884fb1SKAMEZAWA Hiroyuki 682d9713679SLai Jiangshan /* check which state of node_states will be changed when online memory */ 683d9713679SLai Jiangshan static void node_states_check_changes_online(unsigned long nr_pages, 684d9713679SLai Jiangshan struct zone *zone, struct memory_notify *arg) 685d9713679SLai Jiangshan { 686d9713679SLai Jiangshan int nid = zone_to_nid(zone); 687d9713679SLai Jiangshan 68898fa15f3SAnshuman Khandual arg->status_change_nid = NUMA_NO_NODE; 68998fa15f3SAnshuman Khandual arg->status_change_nid_normal = NUMA_NO_NODE; 69098fa15f3SAnshuman Khandual arg->status_change_nid_high = NUMA_NO_NODE; 6916715ddf9SLai Jiangshan 6926715ddf9SLai Jiangshan if (!node_state(nid, N_MEMORY)) 693d9713679SLai Jiangshan arg->status_change_nid = nid; 6948efe33f4SOscar Salvador if (zone_idx(zone) <= ZONE_NORMAL && !node_state(nid, N_NORMAL_MEMORY)) 6958efe33f4SOscar Salvador arg->status_change_nid_normal = nid; 6968efe33f4SOscar Salvador #ifdef CONFIG_HIGHMEM 697d3ba3ae1SBaoquan He if (zone_idx(zone) <= ZONE_HIGHMEM && !node_state(nid, N_HIGH_MEMORY)) 6988efe33f4SOscar Salvador arg->status_change_nid_high = nid; 6998efe33f4SOscar Salvador #endif 700d9713679SLai Jiangshan } 701d9713679SLai Jiangshan 702d9713679SLai Jiangshan static void node_states_set_node(int node, struct memory_notify *arg) 703d9713679SLai Jiangshan { 704d9713679SLai Jiangshan if (arg->status_change_nid_normal >= 0) 705d9713679SLai Jiangshan node_set_state(node, N_NORMAL_MEMORY); 706d9713679SLai Jiangshan 7076715ddf9SLai Jiangshan if (arg->status_change_nid_high >= 0) 708d9713679SLai Jiangshan node_set_state(node, N_HIGH_MEMORY); 7096715ddf9SLai Jiangshan 71083d83612SOscar Salvador if (arg->status_change_nid >= 0) 7116715ddf9SLai Jiangshan node_set_state(node, N_MEMORY); 712d9713679SLai Jiangshan } 713d9713679SLai Jiangshan 714f1dd2cd1SMichal Hocko static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, 715f1dd2cd1SMichal Hocko unsigned long nr_pages) 716f1dd2cd1SMichal Hocko { 717f1dd2cd1SMichal Hocko unsigned long old_end_pfn = zone_end_pfn(zone); 718f1dd2cd1SMichal Hocko 719f1dd2cd1SMichal Hocko if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) 720f1dd2cd1SMichal Hocko zone->zone_start_pfn = start_pfn; 721f1dd2cd1SMichal Hocko 722f1dd2cd1SMichal Hocko zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn; 723f1dd2cd1SMichal Hocko } 724f1dd2cd1SMichal Hocko 725f1dd2cd1SMichal Hocko static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned long start_pfn, 726f1dd2cd1SMichal Hocko unsigned long nr_pages) 727f1dd2cd1SMichal Hocko { 728f1dd2cd1SMichal Hocko unsigned long old_end_pfn = pgdat_end_pfn(pgdat); 729f1dd2cd1SMichal Hocko 730f1dd2cd1SMichal Hocko if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) 731f1dd2cd1SMichal Hocko pgdat->node_start_pfn = start_pfn; 732f1dd2cd1SMichal Hocko 733f1dd2cd1SMichal Hocko pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn; 734f1dd2cd1SMichal Hocko } 735f1dd2cd1SMichal Hocko 736a99583e7SChristoph Hellwig void __ref move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, 737a99583e7SChristoph Hellwig unsigned long nr_pages, struct vmem_altmap *altmap) 738f1dd2cd1SMichal Hocko { 739f1dd2cd1SMichal Hocko struct pglist_data *pgdat = zone->zone_pgdat; 740f1dd2cd1SMichal Hocko int nid = pgdat->node_id; 741f1dd2cd1SMichal Hocko unsigned long flags; 742f1dd2cd1SMichal Hocko 743f1dd2cd1SMichal Hocko clear_zone_contiguous(zone); 744f1dd2cd1SMichal Hocko 745f1dd2cd1SMichal Hocko /* TODO Huh pgdat is irqsave while zone is not. It used to be like that before */ 746f1dd2cd1SMichal Hocko pgdat_resize_lock(pgdat, &flags); 747f1dd2cd1SMichal Hocko zone_span_writelock(zone); 748fa004ab7SWei Yang if (zone_is_empty(zone)) 749fa004ab7SWei Yang init_currently_empty_zone(zone, start_pfn, nr_pages); 750f1dd2cd1SMichal Hocko resize_zone_range(zone, start_pfn, nr_pages); 751f1dd2cd1SMichal Hocko zone_span_writeunlock(zone); 752f1dd2cd1SMichal Hocko resize_pgdat_range(pgdat, start_pfn, nr_pages); 753f1dd2cd1SMichal Hocko pgdat_resize_unlock(pgdat, &flags); 754f1dd2cd1SMichal Hocko 755f1dd2cd1SMichal Hocko /* 756f1dd2cd1SMichal Hocko * TODO now we have a visible range of pages which are not associated 757f1dd2cd1SMichal Hocko * with their zone properly. Not nice but set_pfnblock_flags_mask 758f1dd2cd1SMichal Hocko * expects the zone spans the pfn range. All the pages in the range 759f1dd2cd1SMichal Hocko * are reserved so nobody should be touching them so we should be safe 760f1dd2cd1SMichal Hocko */ 761a99583e7SChristoph Hellwig memmap_init_zone(nr_pages, nid, zone_idx(zone), start_pfn, 762a99583e7SChristoph Hellwig MEMMAP_HOTPLUG, altmap); 763f1dd2cd1SMichal Hocko 764f1dd2cd1SMichal Hocko set_zone_contiguous(zone); 765f1dd2cd1SMichal Hocko } 766f1dd2cd1SMichal Hocko 767f1dd2cd1SMichal Hocko /* 768c246a213SMichal Hocko * Returns a default kernel memory zone for the given pfn range. 769c246a213SMichal Hocko * If no kernel zone covers this pfn range it will automatically go 770c246a213SMichal Hocko * to the ZONE_NORMAL. 771c246a213SMichal Hocko */ 772c6f03e29SMichal Hocko static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn, 773c246a213SMichal Hocko unsigned long nr_pages) 774c246a213SMichal Hocko { 775c246a213SMichal Hocko struct pglist_data *pgdat = NODE_DATA(nid); 776c246a213SMichal Hocko int zid; 777c246a213SMichal Hocko 778c246a213SMichal Hocko for (zid = 0; zid <= ZONE_NORMAL; zid++) { 779c246a213SMichal Hocko struct zone *zone = &pgdat->node_zones[zid]; 780c246a213SMichal Hocko 781c246a213SMichal Hocko if (zone_intersects(zone, start_pfn, nr_pages)) 782c246a213SMichal Hocko return zone; 783c246a213SMichal Hocko } 784c246a213SMichal Hocko 785c246a213SMichal Hocko return &pgdat->node_zones[ZONE_NORMAL]; 786c246a213SMichal Hocko } 787c246a213SMichal Hocko 788c6f03e29SMichal Hocko static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, 789c6f03e29SMichal Hocko unsigned long nr_pages) 790e5e68930SMichal Hocko { 791c6f03e29SMichal Hocko struct zone *kernel_zone = default_kernel_zone_for_pfn(nid, start_pfn, 792c6f03e29SMichal Hocko nr_pages); 793c6f03e29SMichal Hocko struct zone *movable_zone = &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; 794c6f03e29SMichal Hocko bool in_kernel = zone_intersects(kernel_zone, start_pfn, nr_pages); 795c6f03e29SMichal Hocko bool in_movable = zone_intersects(movable_zone, start_pfn, nr_pages); 796e5e68930SMichal Hocko 797e5e68930SMichal Hocko /* 798c6f03e29SMichal Hocko * We inherit the existing zone in a simple case where zones do not 799c6f03e29SMichal Hocko * overlap in the given range 800e5e68930SMichal Hocko */ 801c6f03e29SMichal Hocko if (in_kernel ^ in_movable) 802c6f03e29SMichal Hocko return (in_kernel) ? kernel_zone : movable_zone; 803e5e68930SMichal Hocko 804c6f03e29SMichal Hocko /* 805c6f03e29SMichal Hocko * If the range doesn't belong to any zone or two zones overlap in the 806c6f03e29SMichal Hocko * given range then we use movable zone only if movable_node is 807c6f03e29SMichal Hocko * enabled because we always online to a kernel zone by default. 808c6f03e29SMichal Hocko */ 809c6f03e29SMichal Hocko return movable_node_enabled ? movable_zone : kernel_zone; 8109f123ab5SMichal Hocko } 8119f123ab5SMichal Hocko 812e5e68930SMichal Hocko struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, 813e5e68930SMichal Hocko unsigned long nr_pages) 814f1dd2cd1SMichal Hocko { 815c6f03e29SMichal Hocko if (online_type == MMOP_ONLINE_KERNEL) 816c6f03e29SMichal Hocko return default_kernel_zone_for_pfn(nid, start_pfn, nr_pages); 817f1dd2cd1SMichal Hocko 818c6f03e29SMichal Hocko if (online_type == MMOP_ONLINE_MOVABLE) 819c6f03e29SMichal Hocko return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; 820f1dd2cd1SMichal Hocko 821c6f03e29SMichal Hocko return default_zone_for_pfn(nid, start_pfn, nr_pages); 822e5e68930SMichal Hocko } 823e5e68930SMichal Hocko 824e5e68930SMichal Hocko /* 825e5e68930SMichal Hocko * Associates the given pfn range with the given node and the zone appropriate 826e5e68930SMichal Hocko * for the given online type. 827e5e68930SMichal Hocko */ 828e5e68930SMichal Hocko static struct zone * __meminit move_pfn_range(int online_type, int nid, 829e5e68930SMichal Hocko unsigned long start_pfn, unsigned long nr_pages) 830e5e68930SMichal Hocko { 831e5e68930SMichal Hocko struct zone *zone; 832e5e68930SMichal Hocko 833e5e68930SMichal Hocko zone = zone_for_pfn_range(online_type, nid, start_pfn, nr_pages); 834a99583e7SChristoph Hellwig move_pfn_range_to_zone(zone, start_pfn, nr_pages, NULL); 835f1dd2cd1SMichal Hocko return zone; 836df429ac0SReza Arbab } 83775884fb1SKAMEZAWA Hiroyuki 838511c2abaSLai Jiangshan int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) 83975884fb1SKAMEZAWA Hiroyuki { 840aa47228aSCody P Schafer unsigned long flags; 8413947be19SDave Hansen unsigned long onlined_pages = 0; 8423947be19SDave Hansen struct zone *zone; 8436811378eSYasunori Goto int need_zonelists_rebuild = 0; 8447b78d335SYasunori Goto int nid; 8457b78d335SYasunori Goto int ret; 8467b78d335SYasunori Goto struct memory_notify arg; 847d0dc12e8SPavel Tatashin struct memory_block *mem; 8483947be19SDave Hansen 849381eab4aSDavid Hildenbrand mem_hotplug_begin(); 850381eab4aSDavid Hildenbrand 851d0dc12e8SPavel Tatashin /* 852d0dc12e8SPavel Tatashin * We can't use pfn_to_nid() because nid might be stored in struct page 853d0dc12e8SPavel Tatashin * which is not yet initialized. Instead, we find nid from memory block. 854d0dc12e8SPavel Tatashin */ 855d0dc12e8SPavel Tatashin mem = find_memory_block(__pfn_to_section(pfn)); 856d0dc12e8SPavel Tatashin nid = mem->nid; 85789c02e69SDavid Hildenbrand put_device(&mem->dev); 858d0dc12e8SPavel Tatashin 859f1dd2cd1SMichal Hocko /* associate pfn range with the zone */ 860f1dd2cd1SMichal Hocko zone = move_pfn_range(online_type, nid, pfn, nr_pages); 861511c2abaSLai Jiangshan 8627b78d335SYasunori Goto arg.start_pfn = pfn; 8637b78d335SYasunori Goto arg.nr_pages = nr_pages; 864d9713679SLai Jiangshan node_states_check_changes_online(nr_pages, zone, &arg); 8657b78d335SYasunori Goto 8667b78d335SYasunori Goto ret = memory_notify(MEM_GOING_ONLINE, &arg); 8677b78d335SYasunori Goto ret = notifier_to_errno(ret); 868e33e33b4SChen Yucong if (ret) 869e33e33b4SChen Yucong goto failed_addition; 870e33e33b4SChen Yucong 8713947be19SDave Hansen /* 8726811378eSYasunori Goto * If this zone is not populated, then it is not in zonelist. 8736811378eSYasunori Goto * This means the page allocator ignores this zone. 8746811378eSYasunori Goto * So, zonelist must be updated after online. 8756811378eSYasunori Goto */ 8766dcd73d7SWen Congyang if (!populated_zone(zone)) { 8776811378eSYasunori Goto need_zonelists_rebuild = 1; 87872675e13SMichal Hocko setup_zone_pageset(zone); 8796dcd73d7SWen Congyang } 8806811378eSYasunori Goto 881908eedc6SKAMEZAWA Hiroyuki ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, 88275884fb1SKAMEZAWA Hiroyuki online_pages_range); 883fd8a4221SGeoff Levand if (ret) { 8846dcd73d7SWen Congyang if (need_zonelists_rebuild) 8856dcd73d7SWen Congyang zone_pcp_reset(zone); 886e33e33b4SChen Yucong goto failed_addition; 887fd8a4221SGeoff Levand } 888fd8a4221SGeoff Levand 8893947be19SDave Hansen zone->present_pages += onlined_pages; 890aa47228aSCody P Schafer 891aa47228aSCody P Schafer pgdat_resize_lock(zone->zone_pgdat, &flags); 892f2937be5SYasunori Goto zone->zone_pgdat->node_present_pages += onlined_pages; 893aa47228aSCody P Schafer pgdat_resize_unlock(zone->zone_pgdat, &flags); 894aa47228aSCody P Schafer 895*e900a918SDan Williams shuffle_zone(zone); 896*e900a918SDan Williams 89708dff7b7SJiang Liu if (onlined_pages) { 898e888ca35SVlastimil Babka node_states_set_node(nid, &arg); 8991f522509SHaicheng Li if (need_zonelists_rebuild) 90072675e13SMichal Hocko build_all_zonelists(NULL); 9011f522509SHaicheng Li else 902112067f0SShaohua Li zone_pcp_update(zone); 90308dff7b7SJiang Liu } 9041f522509SHaicheng Li 9051b79acc9SKOSAKI Motohiro init_per_zone_wmark_min(); 9061b79acc9SKOSAKI Motohiro 907698b1b30SVlastimil Babka if (onlined_pages) { 908e888ca35SVlastimil Babka kswapd_run(nid); 909698b1b30SVlastimil Babka kcompactd_run(nid); 910698b1b30SVlastimil Babka } 91161b13993SDave Hansen 9125a4d4361SKAMEZAWA Hiroyuki vm_total_pages = nr_free_pagecache_pages(); 9132f7f24ecSKent Liu 9142d1d43f6SChandra Seetharaman writeback_set_ratelimit(); 9157b78d335SYasunori Goto 9167b78d335SYasunori Goto if (onlined_pages) 9177b78d335SYasunori Goto memory_notify(MEM_ONLINE, &arg); 918381eab4aSDavid Hildenbrand mem_hotplug_done(); 91930467e0bSDavid Rientjes return 0; 920e33e33b4SChen Yucong 921e33e33b4SChen Yucong failed_addition: 922e33e33b4SChen Yucong pr_debug("online_pages [mem %#010llx-%#010llx] failed\n", 923e33e33b4SChen Yucong (unsigned long long) pfn << PAGE_SHIFT, 924e33e33b4SChen Yucong (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1); 925e33e33b4SChen Yucong memory_notify(MEM_CANCEL_ONLINE, &arg); 926381eab4aSDavid Hildenbrand mem_hotplug_done(); 927e33e33b4SChen Yucong return ret; 9283947be19SDave Hansen } 92953947027SKeith Mannthey #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 930bc02af93SYasunori Goto 9310bd85420STang Chen static void reset_node_present_pages(pg_data_t *pgdat) 9320bd85420STang Chen { 9330bd85420STang Chen struct zone *z; 9340bd85420STang Chen 9350bd85420STang Chen for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) 9360bd85420STang Chen z->present_pages = 0; 9370bd85420STang Chen 9380bd85420STang Chen pgdat->node_present_pages = 0; 9390bd85420STang Chen } 9400bd85420STang Chen 941e1319331SHidetoshi Seto /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ 942e1319331SHidetoshi Seto static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) 9439af3c2deSYasunori Goto { 9449af3c2deSYasunori Goto struct pglist_data *pgdat; 945c8e861a5SFabian Frederick unsigned long start_pfn = PFN_DOWN(start); 9469af3c2deSYasunori Goto 947a1e565aaSTang Chen pgdat = NODE_DATA(nid); 948a1e565aaSTang Chen if (!pgdat) { 9499af3c2deSYasunori Goto pgdat = arch_alloc_nodedata(nid); 9509af3c2deSYasunori Goto if (!pgdat) 9519af3c2deSYasunori Goto return NULL; 9529af3c2deSYasunori Goto 9539af3c2deSYasunori Goto arch_refresh_nodedata(nid, pgdat); 954b0dc3a34SGu Zheng } else { 955e716f2ebSMel Gorman /* 956e716f2ebSMel Gorman * Reset the nr_zones, order and classzone_idx before reuse. 957e716f2ebSMel Gorman * Note that kswapd will init kswapd_classzone_idx properly 958e716f2ebSMel Gorman * when it starts in the near future. 959e716f2ebSMel Gorman */ 960b0dc3a34SGu Zheng pgdat->nr_zones = 0; 96138087d9bSMel Gorman pgdat->kswapd_order = 0; 96238087d9bSMel Gorman pgdat->kswapd_classzone_idx = 0; 963a1e565aaSTang Chen } 9649af3c2deSYasunori Goto 9659af3c2deSYasunori Goto /* we can use NODE_DATA(nid) from here */ 9669af3c2deSYasunori Goto 96703e85f9dSOscar Salvador pgdat->node_id = nid; 96803e85f9dSOscar Salvador pgdat->node_start_pfn = start_pfn; 96903e85f9dSOscar Salvador 9709af3c2deSYasunori Goto /* init node's zones as empty zones, we don't have any present pages.*/ 97103e85f9dSOscar Salvador free_area_init_core_hotplug(nid); 9725830169fSReza Arbab pgdat->per_cpu_nodestats = alloc_percpu(struct per_cpu_nodestat); 9739af3c2deSYasunori Goto 974959ecc48SKAMEZAWA Hiroyuki /* 975959ecc48SKAMEZAWA Hiroyuki * The node we allocated has no zone fallback lists. For avoiding 976959ecc48SKAMEZAWA Hiroyuki * to access not-initialized zonelist, build here. 977959ecc48SKAMEZAWA Hiroyuki */ 97872675e13SMichal Hocko build_all_zonelists(pgdat); 979959ecc48SKAMEZAWA Hiroyuki 980f784a3f1STang Chen /* 9810bd85420STang Chen * When memory is hot-added, all the memory is in offline state. So 9820bd85420STang Chen * clear all zones' present_pages because they will be updated in 9830bd85420STang Chen * online_pages() and offline_pages(). 9840bd85420STang Chen */ 98503e85f9dSOscar Salvador reset_node_managed_pages(pgdat); 9860bd85420STang Chen reset_node_present_pages(pgdat); 9870bd85420STang Chen 9889af3c2deSYasunori Goto return pgdat; 9899af3c2deSYasunori Goto } 9909af3c2deSYasunori Goto 991b9ff0360SOscar Salvador static void rollback_node_hotadd(int nid) 9929af3c2deSYasunori Goto { 993b9ff0360SOscar Salvador pg_data_t *pgdat = NODE_DATA(nid); 994b9ff0360SOscar Salvador 9959af3c2deSYasunori Goto arch_refresh_nodedata(nid, NULL); 9965830169fSReza Arbab free_percpu(pgdat->per_cpu_nodestats); 9979af3c2deSYasunori Goto arch_free_nodedata(pgdat); 9989af3c2deSYasunori Goto return; 9999af3c2deSYasunori Goto } 10009af3c2deSYasunori Goto 10010a547039SKAMEZAWA Hiroyuki 100201b0f197SToshi Kani /** 100301b0f197SToshi Kani * try_online_node - online a node if offlined 1004e8b098fcSMike Rapoport * @nid: the node ID 1005b9ff0360SOscar Salvador * @start: start addr of the node 1006b9ff0360SOscar Salvador * @set_node_online: Whether we want to online the node 1007cf23422bSminskey guo * called by cpu_up() to online a node without onlined memory. 1008b9ff0360SOscar Salvador * 1009b9ff0360SOscar Salvador * Returns: 1010b9ff0360SOscar Salvador * 1 -> a new node has been allocated 1011b9ff0360SOscar Salvador * 0 -> the node is already online 1012b9ff0360SOscar Salvador * -ENOMEM -> the node could not be allocated 1013cf23422bSminskey guo */ 1014b9ff0360SOscar Salvador static int __try_online_node(int nid, u64 start, bool set_node_online) 1015cf23422bSminskey guo { 1016cf23422bSminskey guo pg_data_t *pgdat; 1017b9ff0360SOscar Salvador int ret = 1; 1018cf23422bSminskey guo 101901b0f197SToshi Kani if (node_online(nid)) 102001b0f197SToshi Kani return 0; 102101b0f197SToshi Kani 1022b9ff0360SOscar Salvador pgdat = hotadd_new_pgdat(nid, start); 10237553e8f2SDavid Rientjes if (!pgdat) { 102401b0f197SToshi Kani pr_err("Cannot online node %d due to NULL pgdat\n", nid); 1025cf23422bSminskey guo ret = -ENOMEM; 1026cf23422bSminskey guo goto out; 1027cf23422bSminskey guo } 1028b9ff0360SOscar Salvador 1029b9ff0360SOscar Salvador if (set_node_online) { 1030cf23422bSminskey guo node_set_online(nid); 1031cf23422bSminskey guo ret = register_one_node(nid); 1032cf23422bSminskey guo BUG_ON(ret); 1033b9ff0360SOscar Salvador } 1034cf23422bSminskey guo out: 1035b9ff0360SOscar Salvador return ret; 1036b9ff0360SOscar Salvador } 1037b9ff0360SOscar Salvador 1038b9ff0360SOscar Salvador /* 1039b9ff0360SOscar Salvador * Users of this function always want to online/register the node 1040b9ff0360SOscar Salvador */ 1041b9ff0360SOscar Salvador int try_online_node(int nid) 1042b9ff0360SOscar Salvador { 1043b9ff0360SOscar Salvador int ret; 1044b9ff0360SOscar Salvador 1045b9ff0360SOscar Salvador mem_hotplug_begin(); 1046b9ff0360SOscar Salvador ret = __try_online_node(nid, 0, true); 1047bfc8c901SVladimir Davydov mem_hotplug_done(); 1048cf23422bSminskey guo return ret; 1049cf23422bSminskey guo } 1050cf23422bSminskey guo 105127356f54SToshi Kani static int check_hotplug_memory_range(u64 start, u64 size) 105227356f54SToshi Kani { 1053ba325585SPavel Tatashin unsigned long block_sz = memory_block_size_bytes(); 1054ba325585SPavel Tatashin u64 block_nr_pages = block_sz >> PAGE_SHIFT; 105527356f54SToshi Kani u64 nr_pages = size >> PAGE_SHIFT; 1056ba325585SPavel Tatashin u64 start_pfn = PFN_DOWN(start); 105727356f54SToshi Kani 1058ba325585SPavel Tatashin /* memory range must be block size aligned */ 1059ba325585SPavel Tatashin if (!nr_pages || !IS_ALIGNED(start_pfn, block_nr_pages) || 1060ba325585SPavel Tatashin !IS_ALIGNED(nr_pages, block_nr_pages)) { 1061ba325585SPavel Tatashin pr_err("Block size [%#lx] unaligned hotplug range: start %#llx, size %#llx", 1062ba325585SPavel Tatashin block_sz, start, size); 106327356f54SToshi Kani return -EINVAL; 106427356f54SToshi Kani } 106527356f54SToshi Kani 106627356f54SToshi Kani return 0; 106727356f54SToshi Kani } 106827356f54SToshi Kani 106931bc3858SVitaly Kuznetsov static int online_memory_block(struct memory_block *mem, void *arg) 107031bc3858SVitaly Kuznetsov { 1071dc18d706SNathan Fontenot return device_online(&mem->dev); 107231bc3858SVitaly Kuznetsov } 107331bc3858SVitaly Kuznetsov 10748df1d0e4SDavid Hildenbrand /* 10758df1d0e4SDavid Hildenbrand * NOTE: The caller must call lock_device_hotplug() to serialize hotplug 10768df1d0e4SDavid Hildenbrand * and online/offline operations (triggered e.g. by sysfs). 10778df1d0e4SDavid Hildenbrand * 10788df1d0e4SDavid Hildenbrand * we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG 10798df1d0e4SDavid Hildenbrand */ 1080f29d8e9cSDavid Hildenbrand int __ref add_memory_resource(int nid, struct resource *res) 1081bc02af93SYasunori Goto { 1082940519f0SMichal Hocko struct mhp_restrictions restrictions = { 1083940519f0SMichal Hocko .flags = MHP_MEMBLOCK_API, 1084940519f0SMichal Hocko }; 108562cedb9fSDavid Vrabel u64 start, size; 1086b9ff0360SOscar Salvador bool new_node = false; 1087bc02af93SYasunori Goto int ret; 1088bc02af93SYasunori Goto 108962cedb9fSDavid Vrabel start = res->start; 109062cedb9fSDavid Vrabel size = resource_size(res); 109162cedb9fSDavid Vrabel 109227356f54SToshi Kani ret = check_hotplug_memory_range(start, size); 109327356f54SToshi Kani if (ret) 109427356f54SToshi Kani return ret; 109527356f54SToshi Kani 1096bfc8c901SVladimir Davydov mem_hotplug_begin(); 1097ac13c462SNathan Zimmer 10987f36e3e5STang Chen /* 10997f36e3e5STang Chen * Add new range to memblock so that when hotadd_new_pgdat() is called 11007f36e3e5STang Chen * to allocate new pgdat, get_pfn_range_for_nid() will be able to find 11017f36e3e5STang Chen * this new range and calculate total pages correctly. The range will 11027f36e3e5STang Chen * be removed at hot-remove time. 11037f36e3e5STang Chen */ 11047f36e3e5STang Chen memblock_add_node(start, size, nid); 11057f36e3e5STang Chen 1106b9ff0360SOscar Salvador ret = __try_online_node(nid, start, false); 1107b9ff0360SOscar Salvador if (ret < 0) 110841b9e2d7SWen Congyang goto error; 1109b9ff0360SOscar Salvador new_node = ret; 11109af3c2deSYasunori Goto 1111bc02af93SYasunori Goto /* call arch's memory hotadd */ 1112940519f0SMichal Hocko ret = arch_add_memory(nid, start, size, &restrictions); 11139af3c2deSYasunori Goto if (ret < 0) 11149af3c2deSYasunori Goto goto error; 11159af3c2deSYasunori Goto 1116a1e565aaSTang Chen if (new_node) { 1117d5b6f6a3SOscar Salvador /* If sysfs file of new node can't be created, cpu on the node 11180fc44159SYasunori Goto * can't be hot-added. There is no rollback way now. 11190fc44159SYasunori Goto * So, check by BUG_ON() to catch it reluctantly.. 1120d5b6f6a3SOscar Salvador * We online node here. We can't roll back from here. 11210fc44159SYasunori Goto */ 1122d5b6f6a3SOscar Salvador node_set_online(nid); 1123d5b6f6a3SOscar Salvador ret = __register_one_node(nid); 11240fc44159SYasunori Goto BUG_ON(ret); 11250fc44159SYasunori Goto } 11260fc44159SYasunori Goto 1127d5b6f6a3SOscar Salvador /* link memory sections under this node.*/ 11284fbce633SOscar Salvador ret = link_mem_sections(nid, PFN_DOWN(start), PFN_UP(start + size - 1)); 1129d5b6f6a3SOscar Salvador BUG_ON(ret); 1130d5b6f6a3SOscar Salvador 1131d96ae530Sakpm@linux-foundation.org /* create new memmap entry */ 1132d96ae530Sakpm@linux-foundation.org firmware_map_add_hotplug(start, start + size, "System RAM"); 1133d96ae530Sakpm@linux-foundation.org 1134381eab4aSDavid Hildenbrand /* device_online() will take the lock when calling online_pages() */ 1135381eab4aSDavid Hildenbrand mem_hotplug_done(); 1136381eab4aSDavid Hildenbrand 113731bc3858SVitaly Kuznetsov /* online pages if requested */ 1138f29d8e9cSDavid Hildenbrand if (memhp_auto_online) 113931bc3858SVitaly Kuznetsov walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), 114031bc3858SVitaly Kuznetsov NULL, online_memory_block); 114131bc3858SVitaly Kuznetsov 1142381eab4aSDavid Hildenbrand return ret; 11439af3c2deSYasunori Goto error: 11449af3c2deSYasunori Goto /* rollback pgdat allocation and others */ 1145b9ff0360SOscar Salvador if (new_node) 1146b9ff0360SOscar Salvador rollback_node_hotadd(nid); 11477f36e3e5STang Chen memblock_remove(start, size); 1148bfc8c901SVladimir Davydov mem_hotplug_done(); 1149bc02af93SYasunori Goto return ret; 1150bc02af93SYasunori Goto } 115162cedb9fSDavid Vrabel 11528df1d0e4SDavid Hildenbrand /* requires device_hotplug_lock, see add_memory_resource() */ 11538df1d0e4SDavid Hildenbrand int __ref __add_memory(int nid, u64 start, u64 size) 115462cedb9fSDavid Vrabel { 115562cedb9fSDavid Vrabel struct resource *res; 115662cedb9fSDavid Vrabel int ret; 115762cedb9fSDavid Vrabel 115862cedb9fSDavid Vrabel res = register_memory_resource(start, size); 11596f754ba4SVitaly Kuznetsov if (IS_ERR(res)) 11606f754ba4SVitaly Kuznetsov return PTR_ERR(res); 116162cedb9fSDavid Vrabel 1162f29d8e9cSDavid Hildenbrand ret = add_memory_resource(nid, res); 116362cedb9fSDavid Vrabel if (ret < 0) 116462cedb9fSDavid Vrabel release_memory_resource(res); 116562cedb9fSDavid Vrabel return ret; 116662cedb9fSDavid Vrabel } 11678df1d0e4SDavid Hildenbrand 11688df1d0e4SDavid Hildenbrand int add_memory(int nid, u64 start, u64 size) 11698df1d0e4SDavid Hildenbrand { 11708df1d0e4SDavid Hildenbrand int rc; 11718df1d0e4SDavid Hildenbrand 11728df1d0e4SDavid Hildenbrand lock_device_hotplug(); 11738df1d0e4SDavid Hildenbrand rc = __add_memory(nid, start, size); 11748df1d0e4SDavid Hildenbrand unlock_device_hotplug(); 11758df1d0e4SDavid Hildenbrand 11768df1d0e4SDavid Hildenbrand return rc; 11778df1d0e4SDavid Hildenbrand } 1178bc02af93SYasunori Goto EXPORT_SYMBOL_GPL(add_memory); 11790c0e6195SKAMEZAWA Hiroyuki 11800c0e6195SKAMEZAWA Hiroyuki #ifdef CONFIG_MEMORY_HOTREMOVE 11810c0e6195SKAMEZAWA Hiroyuki /* 11825c755e9fSBadari Pulavarty * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy 11835c755e9fSBadari Pulavarty * set and the size of the free page is given by page_order(). Using this, 11845c755e9fSBadari Pulavarty * the function determines if the pageblock contains only free pages. 11855c755e9fSBadari Pulavarty * Due to buddy contraints, a free page at least the size of a pageblock will 11865c755e9fSBadari Pulavarty * be located at the start of the pageblock 11875c755e9fSBadari Pulavarty */ 11885c755e9fSBadari Pulavarty static inline int pageblock_free(struct page *page) 11895c755e9fSBadari Pulavarty { 11905c755e9fSBadari Pulavarty return PageBuddy(page) && page_order(page) >= pageblock_order; 11915c755e9fSBadari Pulavarty } 11925c755e9fSBadari Pulavarty 1193891cb2a7SMichal Hocko /* Return the pfn of the start of the next active pageblock after a given pfn */ 1194891cb2a7SMichal Hocko static unsigned long next_active_pageblock(unsigned long pfn) 11955c755e9fSBadari Pulavarty { 1196891cb2a7SMichal Hocko struct page *page = pfn_to_page(pfn); 1197891cb2a7SMichal Hocko 11985c755e9fSBadari Pulavarty /* Ensure the starting page is pageblock-aligned */ 1199891cb2a7SMichal Hocko BUG_ON(pfn & (pageblock_nr_pages - 1)); 12005c755e9fSBadari Pulavarty 12015c755e9fSBadari Pulavarty /* If the entire pageblock is free, move to the end of free page */ 12020dcc48c1SKAMEZAWA Hiroyuki if (pageblock_free(page)) { 12030dcc48c1SKAMEZAWA Hiroyuki int order; 12040dcc48c1SKAMEZAWA Hiroyuki /* be careful. we don't have locks, page_order can be changed.*/ 12050dcc48c1SKAMEZAWA Hiroyuki order = page_order(page); 12060dcc48c1SKAMEZAWA Hiroyuki if ((order < MAX_ORDER) && (order >= pageblock_order)) 1207891cb2a7SMichal Hocko return pfn + (1 << order); 12080dcc48c1SKAMEZAWA Hiroyuki } 12095c755e9fSBadari Pulavarty 1210891cb2a7SMichal Hocko return pfn + pageblock_nr_pages; 12115c755e9fSBadari Pulavarty } 12125c755e9fSBadari Pulavarty 1213891cb2a7SMichal Hocko static bool is_pageblock_removable_nolock(unsigned long pfn) 1214fb52bbaeSMathieu Malaterre { 1215891cb2a7SMichal Hocko struct page *page = pfn_to_page(pfn); 1216fb52bbaeSMathieu Malaterre struct zone *zone; 1217fb52bbaeSMathieu Malaterre 1218fb52bbaeSMathieu Malaterre /* 1219fb52bbaeSMathieu Malaterre * We have to be careful here because we are iterating over memory 1220fb52bbaeSMathieu Malaterre * sections which are not zone aware so we might end up outside of 1221fb52bbaeSMathieu Malaterre * the zone but still within the section. 1222fb52bbaeSMathieu Malaterre * We have to take care about the node as well. If the node is offline 1223fb52bbaeSMathieu Malaterre * its NODE_DATA will be NULL - see page_zone. 1224fb52bbaeSMathieu Malaterre */ 1225fb52bbaeSMathieu Malaterre if (!node_online(page_to_nid(page))) 1226fb52bbaeSMathieu Malaterre return false; 1227fb52bbaeSMathieu Malaterre 1228fb52bbaeSMathieu Malaterre zone = page_zone(page); 1229fb52bbaeSMathieu Malaterre pfn = page_to_pfn(page); 1230fb52bbaeSMathieu Malaterre if (!zone_spans_pfn(zone, pfn)) 1231fb52bbaeSMathieu Malaterre return false; 1232fb52bbaeSMathieu Malaterre 1233d381c547SMichal Hocko return !has_unmovable_pages(zone, page, 0, MIGRATE_MOVABLE, SKIP_HWPOISON); 1234fb52bbaeSMathieu Malaterre } 1235fb52bbaeSMathieu Malaterre 12365c755e9fSBadari Pulavarty /* Checks if this range of memory is likely to be hot-removable. */ 1237c98940f6SYaowei Bai bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) 12385c755e9fSBadari Pulavarty { 1239891cb2a7SMichal Hocko unsigned long end_pfn, pfn; 1240891cb2a7SMichal Hocko 1241891cb2a7SMichal Hocko end_pfn = min(start_pfn + nr_pages, 1242891cb2a7SMichal Hocko zone_end_pfn(page_zone(pfn_to_page(start_pfn)))); 12435c755e9fSBadari Pulavarty 12445c755e9fSBadari Pulavarty /* Check the starting page of each pageblock within the range */ 1245891cb2a7SMichal Hocko for (pfn = start_pfn; pfn < end_pfn; pfn = next_active_pageblock(pfn)) { 1246891cb2a7SMichal Hocko if (!is_pageblock_removable_nolock(pfn)) 1247c98940f6SYaowei Bai return false; 124849ac8255SKAMEZAWA Hiroyuki cond_resched(); 12495c755e9fSBadari Pulavarty } 12505c755e9fSBadari Pulavarty 12515c755e9fSBadari Pulavarty /* All pageblocks in the memory block are likely to be hot-removable */ 1252c98940f6SYaowei Bai return true; 12535c755e9fSBadari Pulavarty } 12545c755e9fSBadari Pulavarty 12555c755e9fSBadari Pulavarty /* 1256deb88a2aSToshi Kani * Confirm all pages in a range [start, end) belong to the same zone. 1257a96dfddbSToshi Kani * When true, return its valid [start, end). 12580c0e6195SKAMEZAWA Hiroyuki */ 1259a96dfddbSToshi Kani int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, 1260a96dfddbSToshi Kani unsigned long *valid_start, unsigned long *valid_end) 12610c0e6195SKAMEZAWA Hiroyuki { 12625f0f2887SAndrew Banman unsigned long pfn, sec_end_pfn; 1263a96dfddbSToshi Kani unsigned long start, end; 12640c0e6195SKAMEZAWA Hiroyuki struct zone *zone = NULL; 12650c0e6195SKAMEZAWA Hiroyuki struct page *page; 12660c0e6195SKAMEZAWA Hiroyuki int i; 1267deb88a2aSToshi Kani for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn + 1); 12680c0e6195SKAMEZAWA Hiroyuki pfn < end_pfn; 1269deb88a2aSToshi Kani pfn = sec_end_pfn, sec_end_pfn += PAGES_PER_SECTION) { 12705f0f2887SAndrew Banman /* Make sure the memory section is present first */ 12715f0f2887SAndrew Banman if (!present_section_nr(pfn_to_section_nr(pfn))) 12725f0f2887SAndrew Banman continue; 12735f0f2887SAndrew Banman for (; pfn < sec_end_pfn && pfn < end_pfn; 12740c0e6195SKAMEZAWA Hiroyuki pfn += MAX_ORDER_NR_PAGES) { 12750c0e6195SKAMEZAWA Hiroyuki i = 0; 12760c0e6195SKAMEZAWA Hiroyuki /* This is just a CONFIG_HOLES_IN_ZONE check.*/ 12775f0f2887SAndrew Banman while ((i < MAX_ORDER_NR_PAGES) && 12785f0f2887SAndrew Banman !pfn_valid_within(pfn + i)) 12790c0e6195SKAMEZAWA Hiroyuki i++; 1280d6d8c8a4Szhong jiang if (i == MAX_ORDER_NR_PAGES || pfn + i >= end_pfn) 12810c0e6195SKAMEZAWA Hiroyuki continue; 128224feb47cSMikhail Zaslonko /* Check if we got outside of the zone */ 128324feb47cSMikhail Zaslonko if (zone && !zone_spans_pfn(zone, pfn + i)) 128424feb47cSMikhail Zaslonko return 0; 12850c0e6195SKAMEZAWA Hiroyuki page = pfn_to_page(pfn + i); 12860c0e6195SKAMEZAWA Hiroyuki if (zone && page_zone(page) != zone) 12870c0e6195SKAMEZAWA Hiroyuki return 0; 1288a96dfddbSToshi Kani if (!zone) 1289a96dfddbSToshi Kani start = pfn + i; 12900c0e6195SKAMEZAWA Hiroyuki zone = page_zone(page); 1291a96dfddbSToshi Kani end = pfn + MAX_ORDER_NR_PAGES; 12920c0e6195SKAMEZAWA Hiroyuki } 12935f0f2887SAndrew Banman } 1294deb88a2aSToshi Kani 1295a96dfddbSToshi Kani if (zone) { 1296a96dfddbSToshi Kani *valid_start = start; 1297d6d8c8a4Szhong jiang *valid_end = min(end, end_pfn); 12980c0e6195SKAMEZAWA Hiroyuki return 1; 1299a96dfddbSToshi Kani } else { 1300deb88a2aSToshi Kani return 0; 13010c0e6195SKAMEZAWA Hiroyuki } 1302a96dfddbSToshi Kani } 13030c0e6195SKAMEZAWA Hiroyuki 13040c0e6195SKAMEZAWA Hiroyuki /* 13050efadf48SYisheng Xie * Scan pfn range [start,end) to find movable/migratable pages (LRU pages, 13060efadf48SYisheng Xie * non-lru movable pages and hugepages). We scan pfn because it's much 13070efadf48SYisheng Xie * easier than scanning over linked list. This function returns the pfn 13080efadf48SYisheng Xie * of the first found movable page if it's found, otherwise 0. 13090c0e6195SKAMEZAWA Hiroyuki */ 1310c8721bbbSNaoya Horiguchi static unsigned long scan_movable_pages(unsigned long start, unsigned long end) 13110c0e6195SKAMEZAWA Hiroyuki { 13120c0e6195SKAMEZAWA Hiroyuki unsigned long pfn; 1313eeb0efd0SOscar Salvador 13140c0e6195SKAMEZAWA Hiroyuki for (pfn = start; pfn < end; pfn++) { 1315eeb0efd0SOscar Salvador struct page *page, *head; 1316eeb0efd0SOscar Salvador unsigned long skip; 1317eeb0efd0SOscar Salvador 1318eeb0efd0SOscar Salvador if (!pfn_valid(pfn)) 1319eeb0efd0SOscar Salvador continue; 13200c0e6195SKAMEZAWA Hiroyuki page = pfn_to_page(pfn); 13210c0e6195SKAMEZAWA Hiroyuki if (PageLRU(page)) 13220c0e6195SKAMEZAWA Hiroyuki return pfn; 13230efadf48SYisheng Xie if (__PageMovable(page)) 13240efadf48SYisheng Xie return pfn; 1325eeb0efd0SOscar Salvador 1326eeb0efd0SOscar Salvador if (!PageHuge(page)) 1327eeb0efd0SOscar Salvador continue; 1328eeb0efd0SOscar Salvador head = compound_head(page); 132939186cbeSOscar Salvador if (page_huge_active(head)) 1330c8721bbbSNaoya Horiguchi return pfn; 1331eeb0efd0SOscar Salvador skip = (1 << compound_order(head)) - (page - head); 1332eeb0efd0SOscar Salvador pfn += skip - 1; 13330c0e6195SKAMEZAWA Hiroyuki } 13340c0e6195SKAMEZAWA Hiroyuki return 0; 13350c0e6195SKAMEZAWA Hiroyuki } 13360c0e6195SKAMEZAWA Hiroyuki 1337666feb21SMichal Hocko static struct page *new_node_page(struct page *page, unsigned long private) 1338394e31d2SXishi Qiu { 1339394e31d2SXishi Qiu int nid = page_to_nid(page); 1340231e97e2SLi Zhong nodemask_t nmask = node_states[N_MEMORY]; 13417f252f27SMichal Hocko 13427f252f27SMichal Hocko /* 13437f252f27SMichal Hocko * try to allocate from a different node but reuse this node if there 13447f252f27SMichal Hocko * are no other online nodes to be used (e.g. we are offlining a part 13457f252f27SMichal Hocko * of the only existing node) 13467f252f27SMichal Hocko */ 13477f252f27SMichal Hocko node_clear(nid, nmask); 13487f252f27SMichal Hocko if (nodes_empty(nmask)) 13497f252f27SMichal Hocko node_set(nid, nmask); 1350394e31d2SXishi Qiu 13518b913238SMichal Hocko return new_page_nodemask(page, nid, &nmask); 1352394e31d2SXishi Qiu } 1353394e31d2SXishi Qiu 13540c0e6195SKAMEZAWA Hiroyuki static int 13550c0e6195SKAMEZAWA Hiroyuki do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) 13560c0e6195SKAMEZAWA Hiroyuki { 13570c0e6195SKAMEZAWA Hiroyuki unsigned long pfn; 13580c0e6195SKAMEZAWA Hiroyuki struct page *page; 13590c0e6195SKAMEZAWA Hiroyuki int ret = 0; 13600c0e6195SKAMEZAWA Hiroyuki LIST_HEAD(source); 13610c0e6195SKAMEZAWA Hiroyuki 1362a85009c3SMichal Hocko for (pfn = start_pfn; pfn < end_pfn; pfn++) { 13630c0e6195SKAMEZAWA Hiroyuki if (!pfn_valid(pfn)) 13640c0e6195SKAMEZAWA Hiroyuki continue; 13650c0e6195SKAMEZAWA Hiroyuki page = pfn_to_page(pfn); 1366c8721bbbSNaoya Horiguchi 1367c8721bbbSNaoya Horiguchi if (PageHuge(page)) { 1368c8721bbbSNaoya Horiguchi struct page *head = compound_head(page); 1369daf3538aSOscar Salvador pfn = page_to_pfn(head) + (1<<compound_order(head)) - 1; 1370daf3538aSOscar Salvador isolate_huge_page(head, &source); 1371c8721bbbSNaoya Horiguchi continue; 137294723aafSMichal Hocko } else if (PageTransHuge(page)) 13738135d892SNaoya Horiguchi pfn = page_to_pfn(compound_head(page)) 13748135d892SNaoya Horiguchi + hpage_nr_pages(page) - 1; 1375c8721bbbSNaoya Horiguchi 1376b15c8726SMichal Hocko /* 1377b15c8726SMichal Hocko * HWPoison pages have elevated reference counts so the migration would 1378b15c8726SMichal Hocko * fail on them. It also doesn't make any sense to migrate them in the 1379b15c8726SMichal Hocko * first place. Still try to unmap such a page in case it is still mapped 1380b15c8726SMichal Hocko * (e.g. current hwpoison implementation doesn't unmap KSM pages but keep 1381b15c8726SMichal Hocko * the unmap as the catch all safety net). 1382b15c8726SMichal Hocko */ 1383b15c8726SMichal Hocko if (PageHWPoison(page)) { 1384b15c8726SMichal Hocko if (WARN_ON(PageLRU(page))) 1385b15c8726SMichal Hocko isolate_lru_page(page); 1386b15c8726SMichal Hocko if (page_mapped(page)) 1387b15c8726SMichal Hocko try_to_unmap(page, TTU_IGNORE_MLOCK | TTU_IGNORE_ACCESS); 1388b15c8726SMichal Hocko continue; 1389b15c8726SMichal Hocko } 1390b15c8726SMichal Hocko 1391700c2a46SKonstantin Khlebnikov if (!get_page_unless_zero(page)) 13920c0e6195SKAMEZAWA Hiroyuki continue; 13930c0e6195SKAMEZAWA Hiroyuki /* 13940efadf48SYisheng Xie * We can skip free pages. And we can deal with pages on 13950efadf48SYisheng Xie * LRU and non-lru movable pages. 13960c0e6195SKAMEZAWA Hiroyuki */ 13970efadf48SYisheng Xie if (PageLRU(page)) 139862695a84SNick Piggin ret = isolate_lru_page(page); 13990efadf48SYisheng Xie else 14000efadf48SYisheng Xie ret = isolate_movable_page(page, ISOLATE_UNEVICTABLE); 14010c0e6195SKAMEZAWA Hiroyuki if (!ret) { /* Success */ 140262695a84SNick Piggin list_add_tail(&page->lru, &source); 14030efadf48SYisheng Xie if (!__PageMovable(page)) 1404599d0c95SMel Gorman inc_node_page_state(page, NR_ISOLATED_ANON + 14056d9c285aSKOSAKI Motohiro page_is_file_cache(page)); 14066d9c285aSKOSAKI Motohiro 14070c0e6195SKAMEZAWA Hiroyuki } else { 14082932c8b0SMichal Hocko pr_warn("failed to isolate pfn %lx\n", pfn); 14090efadf48SYisheng Xie dump_page(page, "isolation failed"); 14101723058eSOscar Salvador } 1411700c2a46SKonstantin Khlebnikov put_page(page); 14120c0e6195SKAMEZAWA Hiroyuki } 1413f3ab2636SBob Liu if (!list_empty(&source)) { 1414394e31d2SXishi Qiu /* Allocate a new page from the nearest neighbor node */ 1415394e31d2SXishi Qiu ret = migrate_pages(&source, new_node_page, NULL, 0, 14169c620e2bSHugh Dickins MIGRATE_SYNC, MR_MEMORY_HOTPLUG); 14172932c8b0SMichal Hocko if (ret) { 14182932c8b0SMichal Hocko list_for_each_entry(page, &source, lru) { 14192932c8b0SMichal Hocko pr_warn("migrating pfn %lx failed ret:%d ", 14202932c8b0SMichal Hocko page_to_pfn(page), ret); 14212932c8b0SMichal Hocko dump_page(page, "migration failure"); 14222932c8b0SMichal Hocko } 1423c8721bbbSNaoya Horiguchi putback_movable_pages(&source); 1424f3ab2636SBob Liu } 14252932c8b0SMichal Hocko } 14261723058eSOscar Salvador 14270c0e6195SKAMEZAWA Hiroyuki return ret; 14280c0e6195SKAMEZAWA Hiroyuki } 14290c0e6195SKAMEZAWA Hiroyuki 14300c0e6195SKAMEZAWA Hiroyuki /* 14310c0e6195SKAMEZAWA Hiroyuki * remove from free_area[] and mark all as Reserved. 14320c0e6195SKAMEZAWA Hiroyuki */ 14330c0e6195SKAMEZAWA Hiroyuki static int 14340c0e6195SKAMEZAWA Hiroyuki offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, 14350c0e6195SKAMEZAWA Hiroyuki void *data) 14360c0e6195SKAMEZAWA Hiroyuki { 14375557c766SMichal Hocko unsigned long *offlined_pages = (unsigned long *)data; 14380c0e6195SKAMEZAWA Hiroyuki 14395557c766SMichal Hocko *offlined_pages += __offline_isolated_pages(start, start + nr_pages); 14405557c766SMichal Hocko return 0; 14410c0e6195SKAMEZAWA Hiroyuki } 14420c0e6195SKAMEZAWA Hiroyuki 14430c0e6195SKAMEZAWA Hiroyuki /* 14440c0e6195SKAMEZAWA Hiroyuki * Check all pages in range, recoreded as memory resource, are isolated. 14450c0e6195SKAMEZAWA Hiroyuki */ 14460c0e6195SKAMEZAWA Hiroyuki static int 14470c0e6195SKAMEZAWA Hiroyuki check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, 14480c0e6195SKAMEZAWA Hiroyuki void *data) 14490c0e6195SKAMEZAWA Hiroyuki { 14505557c766SMichal Hocko return test_pages_isolated(start_pfn, start_pfn + nr_pages, true); 14510c0e6195SKAMEZAWA Hiroyuki } 14520c0e6195SKAMEZAWA Hiroyuki 1453c5320926STang Chen static int __init cmdline_parse_movable_node(char *p) 1454c5320926STang Chen { 14554932381eSMichal Hocko #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 145655ac590cSTang Chen movable_node_enabled = true; 14574932381eSMichal Hocko #else 14584932381eSMichal Hocko pr_warn("movable_node parameter depends on CONFIG_HAVE_MEMBLOCK_NODE_MAP to work properly\n"); 14594932381eSMichal Hocko #endif 1460c5320926STang Chen return 0; 1461c5320926STang Chen } 1462c5320926STang Chen early_param("movable_node", cmdline_parse_movable_node); 1463c5320926STang Chen 1464d9713679SLai Jiangshan /* check which state of node_states will be changed when offline memory */ 1465d9713679SLai Jiangshan static void node_states_check_changes_offline(unsigned long nr_pages, 1466d9713679SLai Jiangshan struct zone *zone, struct memory_notify *arg) 1467d9713679SLai Jiangshan { 1468d9713679SLai Jiangshan struct pglist_data *pgdat = zone->zone_pgdat; 1469d9713679SLai Jiangshan unsigned long present_pages = 0; 147086b27beaSOscar Salvador enum zone_type zt; 1471d9713679SLai Jiangshan 147298fa15f3SAnshuman Khandual arg->status_change_nid = NUMA_NO_NODE; 147398fa15f3SAnshuman Khandual arg->status_change_nid_normal = NUMA_NO_NODE; 147498fa15f3SAnshuman Khandual arg->status_change_nid_high = NUMA_NO_NODE; 147586b27beaSOscar Salvador 147686b27beaSOscar Salvador /* 147786b27beaSOscar Salvador * Check whether node_states[N_NORMAL_MEMORY] will be changed. 147886b27beaSOscar Salvador * If the memory to be offline is within the range 147986b27beaSOscar Salvador * [0..ZONE_NORMAL], and it is the last present memory there, 148086b27beaSOscar Salvador * the zones in that range will become empty after the offlining, 148186b27beaSOscar Salvador * thus we can determine that we need to clear the node from 148286b27beaSOscar Salvador * node_states[N_NORMAL_MEMORY]. 148386b27beaSOscar Salvador */ 148486b27beaSOscar Salvador for (zt = 0; zt <= ZONE_NORMAL; zt++) 148586b27beaSOscar Salvador present_pages += pgdat->node_zones[zt].present_pages; 148686b27beaSOscar Salvador if (zone_idx(zone) <= ZONE_NORMAL && nr_pages >= present_pages) 148786b27beaSOscar Salvador arg->status_change_nid_normal = zone_to_nid(zone); 1488d9713679SLai Jiangshan 14896715ddf9SLai Jiangshan #ifdef CONFIG_HIGHMEM 14906715ddf9SLai Jiangshan /* 149186b27beaSOscar Salvador * node_states[N_HIGH_MEMORY] contains nodes which 149286b27beaSOscar Salvador * have normal memory or high memory. 149386b27beaSOscar Salvador * Here we add the present_pages belonging to ZONE_HIGHMEM. 149486b27beaSOscar Salvador * If the zone is within the range of [0..ZONE_HIGHMEM), and 149586b27beaSOscar Salvador * we determine that the zones in that range become empty, 149686b27beaSOscar Salvador * we need to clear the node for N_HIGH_MEMORY. 14976715ddf9SLai Jiangshan */ 149886b27beaSOscar Salvador present_pages += pgdat->node_zones[ZONE_HIGHMEM].present_pages; 149986b27beaSOscar Salvador if (zone_idx(zone) <= ZONE_HIGHMEM && nr_pages >= present_pages) 15006715ddf9SLai Jiangshan arg->status_change_nid_high = zone_to_nid(zone); 15016715ddf9SLai Jiangshan #endif 15026715ddf9SLai Jiangshan 1503d9713679SLai Jiangshan /* 150486b27beaSOscar Salvador * We have accounted the pages from [0..ZONE_NORMAL), and 150586b27beaSOscar Salvador * in case of CONFIG_HIGHMEM the pages from ZONE_HIGHMEM 150686b27beaSOscar Salvador * as well. 150786b27beaSOscar Salvador * Here we count the possible pages from ZONE_MOVABLE. 150886b27beaSOscar Salvador * If after having accounted all the pages, we see that the nr_pages 150986b27beaSOscar Salvador * to be offlined is over or equal to the accounted pages, 151086b27beaSOscar Salvador * we know that the node will become empty, and so, we can clear 151186b27beaSOscar Salvador * it for N_MEMORY as well. 1512d9713679SLai Jiangshan */ 151386b27beaSOscar Salvador present_pages += pgdat->node_zones[ZONE_MOVABLE].present_pages; 1514d9713679SLai Jiangshan 1515d9713679SLai Jiangshan if (nr_pages >= present_pages) 1516d9713679SLai Jiangshan arg->status_change_nid = zone_to_nid(zone); 1517d9713679SLai Jiangshan } 1518d9713679SLai Jiangshan 1519d9713679SLai Jiangshan static void node_states_clear_node(int node, struct memory_notify *arg) 1520d9713679SLai Jiangshan { 1521d9713679SLai Jiangshan if (arg->status_change_nid_normal >= 0) 1522d9713679SLai Jiangshan node_clear_state(node, N_NORMAL_MEMORY); 1523d9713679SLai Jiangshan 1524cf01f6f5SOscar Salvador if (arg->status_change_nid_high >= 0) 1525d9713679SLai Jiangshan node_clear_state(node, N_HIGH_MEMORY); 15266715ddf9SLai Jiangshan 1527cf01f6f5SOscar Salvador if (arg->status_change_nid >= 0) 15286715ddf9SLai Jiangshan node_clear_state(node, N_MEMORY); 1529d9713679SLai Jiangshan } 1530d9713679SLai Jiangshan 1531a16cee10SWen Congyang static int __ref __offline_pages(unsigned long start_pfn, 1532ecde0f3eSMichal Hocko unsigned long end_pfn) 15330c0e6195SKAMEZAWA Hiroyuki { 1534ecde0f3eSMichal Hocko unsigned long pfn, nr_pages; 15355557c766SMichal Hocko unsigned long offlined_pages = 0; 15369b7ea46aSQian Cai int ret, node, nr_isolate_pageblock; 1537d702909fSCody P Schafer unsigned long flags; 1538a96dfddbSToshi Kani unsigned long valid_start, valid_end; 15390c0e6195SKAMEZAWA Hiroyuki struct zone *zone; 15407b78d335SYasunori Goto struct memory_notify arg; 154179605093SMichal Hocko char *reason; 15420c0e6195SKAMEZAWA Hiroyuki 1543381eab4aSDavid Hildenbrand mem_hotplug_begin(); 1544381eab4aSDavid Hildenbrand 15450c0e6195SKAMEZAWA Hiroyuki /* This makes hotplug much easier...and readable. 15460c0e6195SKAMEZAWA Hiroyuki we assume this for now. .*/ 1547381eab4aSDavid Hildenbrand if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start, 1548381eab4aSDavid Hildenbrand &valid_end)) { 154979605093SMichal Hocko ret = -EINVAL; 155079605093SMichal Hocko reason = "multizone range"; 155179605093SMichal Hocko goto failed_removal; 1552381eab4aSDavid Hildenbrand } 15537b78d335SYasunori Goto 1554a96dfddbSToshi Kani zone = page_zone(pfn_to_page(valid_start)); 15557b78d335SYasunori Goto node = zone_to_nid(zone); 15567b78d335SYasunori Goto nr_pages = end_pfn - start_pfn; 15577b78d335SYasunori Goto 15580c0e6195SKAMEZAWA Hiroyuki /* set above range as isolated */ 1559b023f468SWen Congyang ret = start_isolate_page_range(start_pfn, end_pfn, 1560d381c547SMichal Hocko MIGRATE_MOVABLE, 1561d381c547SMichal Hocko SKIP_HWPOISON | REPORT_FAILURE); 15629b7ea46aSQian Cai if (ret < 0) { 156379605093SMichal Hocko reason = "failure to isolate range"; 156479605093SMichal Hocko goto failed_removal; 1565381eab4aSDavid Hildenbrand } 15669b7ea46aSQian Cai nr_isolate_pageblock = ret; 15677b78d335SYasunori Goto 15687b78d335SYasunori Goto arg.start_pfn = start_pfn; 15697b78d335SYasunori Goto arg.nr_pages = nr_pages; 1570d9713679SLai Jiangshan node_states_check_changes_offline(nr_pages, zone, &arg); 15717b78d335SYasunori Goto 15727b78d335SYasunori Goto ret = memory_notify(MEM_GOING_OFFLINE, &arg); 15737b78d335SYasunori Goto ret = notifier_to_errno(ret); 157479605093SMichal Hocko if (ret) { 157579605093SMichal Hocko reason = "notifier failure"; 157679605093SMichal Hocko goto failed_removal_isolated; 157779605093SMichal Hocko } 15787b78d335SYasunori Goto 1579bb8965bdSMichal Hocko do { 1580bb8965bdSMichal Hocko for (pfn = start_pfn; pfn;) { 158179605093SMichal Hocko if (signal_pending(current)) { 1582bb8965bdSMichal Hocko ret = -EINTR; 158379605093SMichal Hocko reason = "signal backoff"; 158479605093SMichal Hocko goto failed_removal_isolated; 158579605093SMichal Hocko } 158672b39cfcSMichal Hocko 15870c0e6195SKAMEZAWA Hiroyuki cond_resched(); 15889852a721SMichal Hocko lru_add_drain_all(); 15890c0e6195SKAMEZAWA Hiroyuki 1590bb8965bdSMichal Hocko pfn = scan_movable_pages(pfn, end_pfn); 1591bb8965bdSMichal Hocko if (pfn) { 1592bb8965bdSMichal Hocko /* 1593bb8965bdSMichal Hocko * TODO: fatal migration failures should bail 1594bb8965bdSMichal Hocko * out 1595bb8965bdSMichal Hocko */ 1596bb8965bdSMichal Hocko do_migrate_range(pfn, end_pfn); 1597bb8965bdSMichal Hocko } 15980c0e6195SKAMEZAWA Hiroyuki } 159972b39cfcSMichal Hocko 1600c8721bbbSNaoya Horiguchi /* 1601bb8965bdSMichal Hocko * Dissolve free hugepages in the memory block before doing 1602bb8965bdSMichal Hocko * offlining actually in order to make hugetlbfs's object 1603bb8965bdSMichal Hocko * counting consistent. 1604c8721bbbSNaoya Horiguchi */ 1605082d5b6bSGerald Schaefer ret = dissolve_free_huge_pages(start_pfn, end_pfn); 160679605093SMichal Hocko if (ret) { 160779605093SMichal Hocko reason = "failure to dissolve huge pages"; 160879605093SMichal Hocko goto failed_removal_isolated; 160979605093SMichal Hocko } 16100c0e6195SKAMEZAWA Hiroyuki /* check again */ 16115557c766SMichal Hocko ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, 16125557c766SMichal Hocko NULL, check_pages_isolated_cb); 16135557c766SMichal Hocko } while (ret); 1614bb8965bdSMichal Hocko 1615b3834be5SAdam Buchbinder /* Ok, all of our target is isolated. 16160c0e6195SKAMEZAWA Hiroyuki We cannot do rollback at this point. */ 16175557c766SMichal Hocko walk_system_ram_range(start_pfn, end_pfn - start_pfn, 16185557c766SMichal Hocko &offlined_pages, offline_isolated_pages_cb); 16195557c766SMichal Hocko pr_info("Offlined Pages %ld\n", offlined_pages); 16209b7ea46aSQian Cai /* 16219b7ea46aSQian Cai * Onlining will reset pagetype flags and makes migrate type 16229b7ea46aSQian Cai * MOVABLE, so just need to decrease the number of isolated 16239b7ea46aSQian Cai * pageblocks zone counter here. 16249b7ea46aSQian Cai */ 16259b7ea46aSQian Cai spin_lock_irqsave(&zone->lock, flags); 16269b7ea46aSQian Cai zone->nr_isolate_pageblock -= nr_isolate_pageblock; 16279b7ea46aSQian Cai spin_unlock_irqrestore(&zone->lock, flags); 16289b7ea46aSQian Cai 16290c0e6195SKAMEZAWA Hiroyuki /* removal success */ 16303dcc0571SJiang Liu adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages); 16310c0e6195SKAMEZAWA Hiroyuki zone->present_pages -= offlined_pages; 1632d702909fSCody P Schafer 1633d702909fSCody P Schafer pgdat_resize_lock(zone->zone_pgdat, &flags); 16340c0e6195SKAMEZAWA Hiroyuki zone->zone_pgdat->node_present_pages -= offlined_pages; 1635d702909fSCody P Schafer pgdat_resize_unlock(zone->zone_pgdat, &flags); 16367b78d335SYasunori Goto 16371b79acc9SKOSAKI Motohiro init_per_zone_wmark_min(); 16381b79acc9SKOSAKI Motohiro 16391e8537baSXishi Qiu if (!populated_zone(zone)) { 1640340175b7SJiang Liu zone_pcp_reset(zone); 164172675e13SMichal Hocko build_all_zonelists(NULL); 16421e8537baSXishi Qiu } else 16431e8537baSXishi Qiu zone_pcp_update(zone); 1644340175b7SJiang Liu 1645d9713679SLai Jiangshan node_states_clear_node(node, &arg); 1646698b1b30SVlastimil Babka if (arg.status_change_nid >= 0) { 16478fe23e05SDavid Rientjes kswapd_stop(node); 1648698b1b30SVlastimil Babka kcompactd_stop(node); 1649698b1b30SVlastimil Babka } 1650bce7394aSMinchan Kim 16510c0e6195SKAMEZAWA Hiroyuki vm_total_pages = nr_free_pagecache_pages(); 16520c0e6195SKAMEZAWA Hiroyuki writeback_set_ratelimit(); 16537b78d335SYasunori Goto 16547b78d335SYasunori Goto memory_notify(MEM_OFFLINE, &arg); 1655381eab4aSDavid Hildenbrand mem_hotplug_done(); 16560c0e6195SKAMEZAWA Hiroyuki return 0; 16570c0e6195SKAMEZAWA Hiroyuki 165879605093SMichal Hocko failed_removal_isolated: 165979605093SMichal Hocko undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); 1660c4efe484SQian Cai memory_notify(MEM_CANCEL_OFFLINE, &arg); 16610c0e6195SKAMEZAWA Hiroyuki failed_removal: 166279605093SMichal Hocko pr_debug("memory offlining [mem %#010llx-%#010llx] failed due to %s\n", 1663a62e2f4fSBjorn Helgaas (unsigned long long) start_pfn << PAGE_SHIFT, 166479605093SMichal Hocko ((unsigned long long) end_pfn << PAGE_SHIFT) - 1, 166579605093SMichal Hocko reason); 16660c0e6195SKAMEZAWA Hiroyuki /* pushback to free area */ 1667381eab4aSDavid Hildenbrand mem_hotplug_done(); 16680c0e6195SKAMEZAWA Hiroyuki return ret; 16690c0e6195SKAMEZAWA Hiroyuki } 167071088785SBadari Pulavarty 1671a16cee10SWen Congyang int offline_pages(unsigned long start_pfn, unsigned long nr_pages) 1672a16cee10SWen Congyang { 1673ecde0f3eSMichal Hocko return __offline_pages(start_pfn, start_pfn + nr_pages); 1674a16cee10SWen Congyang } 1675e2ff3940SRafael J. Wysocki #endif /* CONFIG_MEMORY_HOTREMOVE */ 1676a16cee10SWen Congyang 1677bbc76be6SWen Congyang /** 1678bbc76be6SWen Congyang * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) 1679bbc76be6SWen Congyang * @start_pfn: start pfn of the memory range 1680e05c4bbfSToshi Kani * @end_pfn: end pfn of the memory range 1681bbc76be6SWen Congyang * @arg: argument passed to func 1682bbc76be6SWen Congyang * @func: callback for each memory section walked 1683bbc76be6SWen Congyang * 1684bbc76be6SWen Congyang * This function walks through all present mem sections in range 1685bbc76be6SWen Congyang * [start_pfn, end_pfn) and call func on each mem section. 1686bbc76be6SWen Congyang * 1687bbc76be6SWen Congyang * Returns the return value of func. 1688bbc76be6SWen Congyang */ 1689e2ff3940SRafael J. Wysocki int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, 1690bbc76be6SWen Congyang void *arg, int (*func)(struct memory_block *, void *)) 169171088785SBadari Pulavarty { 1692e90bdb7fSWen Congyang struct memory_block *mem = NULL; 1693e90bdb7fSWen Congyang struct mem_section *section; 1694e90bdb7fSWen Congyang unsigned long pfn, section_nr; 1695e90bdb7fSWen Congyang int ret; 169671088785SBadari Pulavarty 1697e90bdb7fSWen Congyang for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { 1698e90bdb7fSWen Congyang section_nr = pfn_to_section_nr(pfn); 1699e90bdb7fSWen Congyang if (!present_section_nr(section_nr)) 1700e90bdb7fSWen Congyang continue; 1701e90bdb7fSWen Congyang 1702e90bdb7fSWen Congyang section = __nr_to_section(section_nr); 1703e90bdb7fSWen Congyang /* same memblock? */ 1704e90bdb7fSWen Congyang if (mem) 1705e90bdb7fSWen Congyang if ((section_nr >= mem->start_section_nr) && 1706e90bdb7fSWen Congyang (section_nr <= mem->end_section_nr)) 1707e90bdb7fSWen Congyang continue; 1708e90bdb7fSWen Congyang 1709e90bdb7fSWen Congyang mem = find_memory_block_hinted(section, mem); 1710e90bdb7fSWen Congyang if (!mem) 1711e90bdb7fSWen Congyang continue; 1712e90bdb7fSWen Congyang 1713bbc76be6SWen Congyang ret = func(mem, arg); 1714e90bdb7fSWen Congyang if (ret) { 1715e90bdb7fSWen Congyang kobject_put(&mem->dev.kobj); 1716e90bdb7fSWen Congyang return ret; 1717e90bdb7fSWen Congyang } 1718e90bdb7fSWen Congyang } 1719e90bdb7fSWen Congyang 1720e90bdb7fSWen Congyang if (mem) 1721e90bdb7fSWen Congyang kobject_put(&mem->dev.kobj); 1722e90bdb7fSWen Congyang 1723bbc76be6SWen Congyang return 0; 1724bbc76be6SWen Congyang } 1725bbc76be6SWen Congyang 1726e2ff3940SRafael J. Wysocki #ifdef CONFIG_MEMORY_HOTREMOVE 1727d6de9d53SXishi Qiu static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) 1728bbc76be6SWen Congyang { 1729bbc76be6SWen Congyang int ret = !is_memblock_offlined(mem); 1730bbc76be6SWen Congyang 1731349daa0fSRandy Dunlap if (unlikely(ret)) { 1732349daa0fSRandy Dunlap phys_addr_t beginpa, endpa; 1733349daa0fSRandy Dunlap 1734349daa0fSRandy Dunlap beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); 1735349daa0fSRandy Dunlap endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1; 1736756a025fSJoe Perches pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n", 1737349daa0fSRandy Dunlap &beginpa, &endpa); 1738349daa0fSRandy Dunlap } 1739bbc76be6SWen Congyang 1740bbc76be6SWen Congyang return ret; 1741bbc76be6SWen Congyang } 1742bbc76be6SWen Congyang 17430f1cfe9dSToshi Kani static int check_cpu_on_node(pg_data_t *pgdat) 174460a5a19eSTang Chen { 174560a5a19eSTang Chen int cpu; 174660a5a19eSTang Chen 174760a5a19eSTang Chen for_each_present_cpu(cpu) { 174860a5a19eSTang Chen if (cpu_to_node(cpu) == pgdat->node_id) 174960a5a19eSTang Chen /* 175060a5a19eSTang Chen * the cpu on this node isn't removed, and we can't 175160a5a19eSTang Chen * offline this node. 175260a5a19eSTang Chen */ 175360a5a19eSTang Chen return -EBUSY; 175460a5a19eSTang Chen } 175560a5a19eSTang Chen 175660a5a19eSTang Chen return 0; 175760a5a19eSTang Chen } 175860a5a19eSTang Chen 17590f1cfe9dSToshi Kani /** 17600f1cfe9dSToshi Kani * try_offline_node 1761e8b098fcSMike Rapoport * @nid: the node ID 17620f1cfe9dSToshi Kani * 17630f1cfe9dSToshi Kani * Offline a node if all memory sections and cpus of the node are removed. 17640f1cfe9dSToshi Kani * 17650f1cfe9dSToshi Kani * NOTE: The caller must call lock_device_hotplug() to serialize hotplug 17660f1cfe9dSToshi Kani * and online/offline operations before this call. 17670f1cfe9dSToshi Kani */ 176890b30cdcSWen Congyang void try_offline_node(int nid) 176960a5a19eSTang Chen { 1770d822b86aSWen Congyang pg_data_t *pgdat = NODE_DATA(nid); 1771d822b86aSWen Congyang unsigned long start_pfn = pgdat->node_start_pfn; 1772d822b86aSWen Congyang unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; 177360a5a19eSTang Chen unsigned long pfn; 177460a5a19eSTang Chen 177560a5a19eSTang Chen for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { 177660a5a19eSTang Chen unsigned long section_nr = pfn_to_section_nr(pfn); 177760a5a19eSTang Chen 177860a5a19eSTang Chen if (!present_section_nr(section_nr)) 177960a5a19eSTang Chen continue; 178060a5a19eSTang Chen 178160a5a19eSTang Chen if (pfn_to_nid(pfn) != nid) 178260a5a19eSTang Chen continue; 178360a5a19eSTang Chen 178460a5a19eSTang Chen /* 178560a5a19eSTang Chen * some memory sections of this node are not removed, and we 178660a5a19eSTang Chen * can't offline node now. 178760a5a19eSTang Chen */ 178860a5a19eSTang Chen return; 178960a5a19eSTang Chen } 179060a5a19eSTang Chen 179146a3679bSMichal Hocko if (check_cpu_on_node(pgdat)) 179260a5a19eSTang Chen return; 179360a5a19eSTang Chen 179460a5a19eSTang Chen /* 179560a5a19eSTang Chen * all memory/cpu of this node are removed, we can offline this 179660a5a19eSTang Chen * node now. 179760a5a19eSTang Chen */ 179860a5a19eSTang Chen node_set_offline(nid); 179960a5a19eSTang Chen unregister_one_node(nid); 180060a5a19eSTang Chen } 180190b30cdcSWen Congyang EXPORT_SYMBOL(try_offline_node); 180260a5a19eSTang Chen 1803d9eb1417SDavid Hildenbrand static void __release_memory_resource(resource_size_t start, 1804d9eb1417SDavid Hildenbrand resource_size_t size) 1805d9eb1417SDavid Hildenbrand { 1806d9eb1417SDavid Hildenbrand int ret; 1807d9eb1417SDavid Hildenbrand 1808d9eb1417SDavid Hildenbrand /* 1809d9eb1417SDavid Hildenbrand * When removing memory in the same granularity as it was added, 1810d9eb1417SDavid Hildenbrand * this function never fails. It might only fail if resources 1811d9eb1417SDavid Hildenbrand * have to be adjusted or split. We'll ignore the error, as 1812d9eb1417SDavid Hildenbrand * removing of memory cannot fail. 1813d9eb1417SDavid Hildenbrand */ 1814d9eb1417SDavid Hildenbrand ret = release_mem_region_adjustable(&iomem_resource, start, size); 1815d9eb1417SDavid Hildenbrand if (ret) { 1816d9eb1417SDavid Hildenbrand resource_size_t endres = start + size - 1; 1817d9eb1417SDavid Hildenbrand 1818d9eb1417SDavid Hildenbrand pr_warn("Unable to release resource <%pa-%pa> (%d)\n", 1819d9eb1417SDavid Hildenbrand &start, &endres, ret); 1820d9eb1417SDavid Hildenbrand } 1821d9eb1417SDavid Hildenbrand } 1822d9eb1417SDavid Hildenbrand 18230f1cfe9dSToshi Kani /** 18240f1cfe9dSToshi Kani * remove_memory 1825e8b098fcSMike Rapoport * @nid: the node ID 1826e8b098fcSMike Rapoport * @start: physical address of the region to remove 1827e8b098fcSMike Rapoport * @size: size of the region to remove 18280f1cfe9dSToshi Kani * 18290f1cfe9dSToshi Kani * NOTE: The caller must call lock_device_hotplug() to serialize hotplug 18300f1cfe9dSToshi Kani * and online/offline operations before this call, as required by 18310f1cfe9dSToshi Kani * try_offline_node(). 18320f1cfe9dSToshi Kani */ 1833d15e5926SDavid Hildenbrand void __ref __remove_memory(int nid, u64 start, u64 size) 1834bbc76be6SWen Congyang { 1835242831ebSRafael J. Wysocki int ret; 1836993c1aadSWen Congyang 183727356f54SToshi Kani BUG_ON(check_hotplug_memory_range(start, size)); 183827356f54SToshi Kani 1839bfc8c901SVladimir Davydov mem_hotplug_begin(); 18406677e3eaSYasuaki Ishimatsu 18416677e3eaSYasuaki Ishimatsu /* 1842242831ebSRafael J. Wysocki * All memory blocks must be offlined before removing memory. Check 1843242831ebSRafael J. Wysocki * whether all memory blocks in question are offline and trigger a BUG() 1844242831ebSRafael J. Wysocki * if this is not the case. 18456677e3eaSYasuaki Ishimatsu */ 1846242831ebSRafael J. Wysocki ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, 1847d6de9d53SXishi Qiu check_memblock_offlined_cb); 1848bfc8c901SVladimir Davydov if (ret) 1849242831ebSRafael J. Wysocki BUG(); 18506677e3eaSYasuaki Ishimatsu 185146c66c4bSYasuaki Ishimatsu /* remove memmap entry */ 185246c66c4bSYasuaki Ishimatsu firmware_map_remove(start, start + size, "System RAM"); 1853f9126ab9SXishi Qiu memblock_free(start, size); 1854f9126ab9SXishi Qiu memblock_remove(start, size); 185546c66c4bSYasuaki Ishimatsu 18562c2a5af6SOscar Salvador arch_remove_memory(nid, start, size, NULL); 1857d9eb1417SDavid Hildenbrand __release_memory_resource(start, size); 185824d335caSWen Congyang 185960a5a19eSTang Chen try_offline_node(nid); 186060a5a19eSTang Chen 1861bfc8c901SVladimir Davydov mem_hotplug_done(); 186271088785SBadari Pulavarty } 1863d15e5926SDavid Hildenbrand 1864d15e5926SDavid Hildenbrand void remove_memory(int nid, u64 start, u64 size) 1865d15e5926SDavid Hildenbrand { 1866d15e5926SDavid Hildenbrand lock_device_hotplug(); 1867d15e5926SDavid Hildenbrand __remove_memory(nid, start, size); 1868d15e5926SDavid Hildenbrand unlock_device_hotplug(); 1869d15e5926SDavid Hildenbrand } 187071088785SBadari Pulavarty EXPORT_SYMBOL_GPL(remove_memory); 1871aba6efc4SRafael J. Wysocki #endif /* CONFIG_MEMORY_HOTREMOVE */ 1872