1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 23947be19SDave Hansen /* 33947be19SDave Hansen * linux/mm/memory_hotplug.c 43947be19SDave Hansen * 53947be19SDave Hansen * Copyright (C) 63947be19SDave Hansen */ 73947be19SDave Hansen 83947be19SDave Hansen #include <linux/stddef.h> 93947be19SDave Hansen #include <linux/mm.h> 10174cd4b1SIngo Molnar #include <linux/sched/signal.h> 113947be19SDave Hansen #include <linux/swap.h> 123947be19SDave Hansen #include <linux/interrupt.h> 133947be19SDave Hansen #include <linux/pagemap.h> 143947be19SDave Hansen #include <linux/compiler.h> 15b95f1b31SPaul Gortmaker #include <linux/export.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/vmalloc.h> 240a547039SKAMEZAWA Hiroyuki #include <linux/ioport.h> 250c0e6195SKAMEZAWA Hiroyuki #include <linux/delay.h> 260c0e6195SKAMEZAWA Hiroyuki #include <linux/migrate.h> 270c0e6195SKAMEZAWA Hiroyuki #include <linux/page-isolation.h> 2871088785SBadari Pulavarty #include <linux/pfn.h> 296ad696d2SAndi Kleen #include <linux/suspend.h> 306d9c285aSKOSAKI Motohiro #include <linux/mm_inline.h> 31d96ae530Sakpm@linux-foundation.org #include <linux/firmware-map.h> 3260a5a19eSTang Chen #include <linux/stop_machine.h> 33c8721bbbSNaoya Horiguchi #include <linux/hugetlb.h> 34c5320926STang Chen #include <linux/memblock.h> 35698b1b30SVlastimil Babka #include <linux/compaction.h> 36b15c8726SMichal Hocko #include <linux/rmap.h> 378581fd40SJakub Kicinski #include <linux/module.h> 383947be19SDave Hansen 393947be19SDave Hansen #include <asm/tlbflush.h> 403947be19SDave Hansen 411e5ad9a3SAdrian Bunk #include "internal.h" 42e900a918SDan Williams #include "shuffle.h" 431e5ad9a3SAdrian Bunk 442d1f649cSAneesh Kumar K.V enum { 452d1f649cSAneesh Kumar K.V MEMMAP_ON_MEMORY_DISABLE = 0, 462d1f649cSAneesh Kumar K.V MEMMAP_ON_MEMORY_ENABLE, 472d1f649cSAneesh Kumar K.V MEMMAP_ON_MEMORY_FORCE, 482d1f649cSAneesh Kumar K.V }; 492d1f649cSAneesh Kumar K.V 502d1f649cSAneesh Kumar K.V static int memmap_mode __read_mostly = MEMMAP_ON_MEMORY_DISABLE; 512d1f649cSAneesh Kumar K.V 522d1f649cSAneesh Kumar K.V static inline unsigned long memory_block_memmap_size(void) 532d1f649cSAneesh Kumar K.V { 542d1f649cSAneesh Kumar K.V return PHYS_PFN(memory_block_size_bytes()) * sizeof(struct page); 552d1f649cSAneesh Kumar K.V } 562d1f649cSAneesh Kumar K.V 572d1f649cSAneesh Kumar K.V static inline unsigned long memory_block_memmap_on_memory_pages(void) 582d1f649cSAneesh Kumar K.V { 592d1f649cSAneesh Kumar K.V unsigned long nr_pages = PFN_UP(memory_block_memmap_size()); 602d1f649cSAneesh Kumar K.V 612d1f649cSAneesh Kumar K.V /* 622d1f649cSAneesh Kumar K.V * In "forced" memmap_on_memory mode, we add extra pages to align the 632d1f649cSAneesh Kumar K.V * vmemmap size to cover full pageblocks. That way, we can add memory 642d1f649cSAneesh Kumar K.V * even if the vmemmap size is not properly aligned, however, we might waste 652d1f649cSAneesh Kumar K.V * memory. 662d1f649cSAneesh Kumar K.V */ 672d1f649cSAneesh Kumar K.V if (memmap_mode == MEMMAP_ON_MEMORY_FORCE) 682d1f649cSAneesh Kumar K.V return pageblock_align(nr_pages); 692d1f649cSAneesh Kumar K.V return nr_pages; 702d1f649cSAneesh Kumar K.V } 712d1f649cSAneesh Kumar K.V 726e02c46bSMuchun Song #ifdef CONFIG_MHP_MEMMAP_ON_MEMORY 73e3a9d9fcSOscar Salvador /* 74e3a9d9fcSOscar Salvador * memory_hotplug.memmap_on_memory parameter 75e3a9d9fcSOscar Salvador */ 762d1f649cSAneesh Kumar K.V static int set_memmap_mode(const char *val, const struct kernel_param *kp) 772d1f649cSAneesh Kumar K.V { 782d1f649cSAneesh Kumar K.V int ret, mode; 792d1f649cSAneesh Kumar K.V bool enabled; 802d1f649cSAneesh Kumar K.V 812d1f649cSAneesh Kumar K.V if (sysfs_streq(val, "force") || sysfs_streq(val, "FORCE")) { 822d1f649cSAneesh Kumar K.V mode = MEMMAP_ON_MEMORY_FORCE; 832d1f649cSAneesh Kumar K.V } else { 842d1f649cSAneesh Kumar K.V ret = kstrtobool(val, &enabled); 852d1f649cSAneesh Kumar K.V if (ret < 0) 862d1f649cSAneesh Kumar K.V return ret; 872d1f649cSAneesh Kumar K.V if (enabled) 882d1f649cSAneesh Kumar K.V mode = MEMMAP_ON_MEMORY_ENABLE; 892d1f649cSAneesh Kumar K.V else 902d1f649cSAneesh Kumar K.V mode = MEMMAP_ON_MEMORY_DISABLE; 912d1f649cSAneesh Kumar K.V } 922d1f649cSAneesh Kumar K.V *((int *)kp->arg) = mode; 932d1f649cSAneesh Kumar K.V if (mode == MEMMAP_ON_MEMORY_FORCE) { 942d1f649cSAneesh Kumar K.V unsigned long memmap_pages = memory_block_memmap_on_memory_pages(); 952d1f649cSAneesh Kumar K.V 962d1f649cSAneesh Kumar K.V pr_info_once("Memory hotplug will waste %ld pages in each memory block\n", 972d1f649cSAneesh Kumar K.V memmap_pages - PFN_UP(memory_block_memmap_size())); 982d1f649cSAneesh Kumar K.V } 992d1f649cSAneesh Kumar K.V return 0; 1002d1f649cSAneesh Kumar K.V } 1012d1f649cSAneesh Kumar K.V 1022d1f649cSAneesh Kumar K.V static int get_memmap_mode(char *buffer, const struct kernel_param *kp) 1032d1f649cSAneesh Kumar K.V { 10411684134SSumanth Korikkar int mode = *((int *)kp->arg); 10511684134SSumanth Korikkar 10611684134SSumanth Korikkar if (mode == MEMMAP_ON_MEMORY_FORCE) 1072d1f649cSAneesh Kumar K.V return sprintf(buffer, "force\n"); 10811684134SSumanth Korikkar return sprintf(buffer, "%c\n", mode ? 'Y' : 'N'); 1092d1f649cSAneesh Kumar K.V } 1102d1f649cSAneesh Kumar K.V 1112d1f649cSAneesh Kumar K.V static const struct kernel_param_ops memmap_mode_ops = { 1122d1f649cSAneesh Kumar K.V .set = set_memmap_mode, 1132d1f649cSAneesh Kumar K.V .get = get_memmap_mode, 1142d1f649cSAneesh Kumar K.V }; 1152d1f649cSAneesh Kumar K.V module_param_cb(memmap_on_memory, &memmap_mode_ops, &memmap_mode, 0444); 1162d1f649cSAneesh Kumar K.V MODULE_PARM_DESC(memmap_on_memory, "Enable memmap on memory for memory hotplug\n" 1172d1f649cSAneesh Kumar K.V "With value \"force\" it could result in memory wastage due " 1182d1f649cSAneesh Kumar K.V "to memmap size limitations (Y/N/force)"); 1196e02c46bSMuchun Song 12066361095SMuchun Song static inline bool mhp_memmap_on_memory(void) 1216e02c46bSMuchun Song { 1222d1f649cSAneesh Kumar K.V return memmap_mode != MEMMAP_ON_MEMORY_DISABLE; 1236e02c46bSMuchun Song } 12466361095SMuchun Song #else 12566361095SMuchun Song static inline bool mhp_memmap_on_memory(void) 12666361095SMuchun Song { 12766361095SMuchun Song return false; 12866361095SMuchun Song } 129e3a9d9fcSOscar Salvador #endif 130a08a2ae3SOscar Salvador 131e83a437fSDavid Hildenbrand enum { 132e83a437fSDavid Hildenbrand ONLINE_POLICY_CONTIG_ZONES = 0, 133e83a437fSDavid Hildenbrand ONLINE_POLICY_AUTO_MOVABLE, 134e83a437fSDavid Hildenbrand }; 135e83a437fSDavid Hildenbrand 136ac62554bSTang Yizhou static const char * const online_policy_to_str[] = { 137e83a437fSDavid Hildenbrand [ONLINE_POLICY_CONTIG_ZONES] = "contig-zones", 138e83a437fSDavid Hildenbrand [ONLINE_POLICY_AUTO_MOVABLE] = "auto-movable", 139e83a437fSDavid Hildenbrand }; 140e83a437fSDavid Hildenbrand 141e83a437fSDavid Hildenbrand static int set_online_policy(const char *val, const struct kernel_param *kp) 142e83a437fSDavid Hildenbrand { 143e83a437fSDavid Hildenbrand int ret = sysfs_match_string(online_policy_to_str, val); 144e83a437fSDavid Hildenbrand 145e83a437fSDavid Hildenbrand if (ret < 0) 146e83a437fSDavid Hildenbrand return ret; 147e83a437fSDavid Hildenbrand *((int *)kp->arg) = ret; 148e83a437fSDavid Hildenbrand return 0; 149e83a437fSDavid Hildenbrand } 150e83a437fSDavid Hildenbrand 151e83a437fSDavid Hildenbrand static int get_online_policy(char *buffer, const struct kernel_param *kp) 152e83a437fSDavid Hildenbrand { 153e83a437fSDavid Hildenbrand return sprintf(buffer, "%s\n", online_policy_to_str[*((int *)kp->arg)]); 154e83a437fSDavid Hildenbrand } 155e83a437fSDavid Hildenbrand 156e83a437fSDavid Hildenbrand /* 157e83a437fSDavid Hildenbrand * memory_hotplug.online_policy: configure online behavior when onlining without 158e83a437fSDavid Hildenbrand * specifying a zone (MMOP_ONLINE) 159e83a437fSDavid Hildenbrand * 160e83a437fSDavid Hildenbrand * "contig-zones": keep zone contiguous 161e83a437fSDavid Hildenbrand * "auto-movable": online memory to ZONE_MOVABLE if the configuration 162e83a437fSDavid Hildenbrand * (auto_movable_ratio, auto_movable_numa_aware) allows for it 163e83a437fSDavid Hildenbrand */ 164e83a437fSDavid Hildenbrand static int online_policy __read_mostly = ONLINE_POLICY_CONTIG_ZONES; 165e83a437fSDavid Hildenbrand static const struct kernel_param_ops online_policy_ops = { 166e83a437fSDavid Hildenbrand .set = set_online_policy, 167e83a437fSDavid Hildenbrand .get = get_online_policy, 168e83a437fSDavid Hildenbrand }; 169e83a437fSDavid Hildenbrand module_param_cb(online_policy, &online_policy_ops, &online_policy, 0644); 170e83a437fSDavid Hildenbrand MODULE_PARM_DESC(online_policy, 171e83a437fSDavid Hildenbrand "Set the online policy (\"contig-zones\", \"auto-movable\") " 172e83a437fSDavid Hildenbrand "Default: \"contig-zones\""); 173e83a437fSDavid Hildenbrand 174e83a437fSDavid Hildenbrand /* 175e83a437fSDavid Hildenbrand * memory_hotplug.auto_movable_ratio: specify maximum MOVABLE:KERNEL ratio 176e83a437fSDavid Hildenbrand * 177e83a437fSDavid Hildenbrand * The ratio represent an upper limit and the kernel might decide to not 178e83a437fSDavid Hildenbrand * online some memory to ZONE_MOVABLE -- e.g., because hotplugged KERNEL memory 179e83a437fSDavid Hildenbrand * doesn't allow for more MOVABLE memory. 180e83a437fSDavid Hildenbrand */ 181e83a437fSDavid Hildenbrand static unsigned int auto_movable_ratio __read_mostly = 301; 182e83a437fSDavid Hildenbrand module_param(auto_movable_ratio, uint, 0644); 183e83a437fSDavid Hildenbrand MODULE_PARM_DESC(auto_movable_ratio, 184e83a437fSDavid Hildenbrand "Set the maximum ratio of MOVABLE:KERNEL memory in the system " 185e83a437fSDavid Hildenbrand "in percent for \"auto-movable\" online policy. Default: 301"); 186e83a437fSDavid Hildenbrand 187e83a437fSDavid Hildenbrand /* 188e83a437fSDavid Hildenbrand * memory_hotplug.auto_movable_numa_aware: consider numa node stats 189e83a437fSDavid Hildenbrand */ 190e83a437fSDavid Hildenbrand #ifdef CONFIG_NUMA 191e83a437fSDavid Hildenbrand static bool auto_movable_numa_aware __read_mostly = true; 192e83a437fSDavid Hildenbrand module_param(auto_movable_numa_aware, bool, 0644); 193e83a437fSDavid Hildenbrand MODULE_PARM_DESC(auto_movable_numa_aware, 194e83a437fSDavid Hildenbrand "Consider numa node stats in addition to global stats in " 195e83a437fSDavid Hildenbrand "\"auto-movable\" online policy. Default: true"); 196e83a437fSDavid Hildenbrand #endif /* CONFIG_NUMA */ 197e83a437fSDavid Hildenbrand 1989d0ad8caSDaniel Kiper /* 1999d0ad8caSDaniel Kiper * online_page_callback contains pointer to current page onlining function. 2009d0ad8caSDaniel Kiper * Initially it is generic_online_page(). If it is required it could be 2019d0ad8caSDaniel Kiper * changed by calling set_online_page_callback() for callback registration 2029d0ad8caSDaniel Kiper * and restore_online_page_callback() for generic callback restore. 2039d0ad8caSDaniel Kiper */ 2049d0ad8caSDaniel Kiper 2059d0ad8caSDaniel Kiper static online_page_callback_t online_page_callback = generic_online_page; 206bfc8c901SVladimir Davydov static DEFINE_MUTEX(online_page_callback_lock); 2079d0ad8caSDaniel Kiper 2083f906ba2SThomas Gleixner DEFINE_STATIC_PERCPU_RWSEM(mem_hotplug_lock); 20920d6c96bSKOSAKI Motohiro 2103f906ba2SThomas Gleixner void get_online_mems(void) 2113f906ba2SThomas Gleixner { 2123f906ba2SThomas Gleixner percpu_down_read(&mem_hotplug_lock); 2133f906ba2SThomas Gleixner } 214bfc8c901SVladimir Davydov 2153f906ba2SThomas Gleixner void put_online_mems(void) 2163f906ba2SThomas Gleixner { 2173f906ba2SThomas Gleixner percpu_up_read(&mem_hotplug_lock); 2183f906ba2SThomas Gleixner } 219bfc8c901SVladimir Davydov 2204932381eSMichal Hocko bool movable_node_enabled = false; 2214932381eSMichal Hocko 2228604d9e5SVitaly Kuznetsov #ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE 2231adf8b46SAnshuman Khandual int mhp_default_online_type = MMOP_OFFLINE; 2248604d9e5SVitaly Kuznetsov #else 2251adf8b46SAnshuman Khandual int mhp_default_online_type = MMOP_ONLINE; 2268604d9e5SVitaly Kuznetsov #endif 22731bc3858SVitaly Kuznetsov 22886dd995dSVitaly Kuznetsov static int __init setup_memhp_default_state(char *str) 22986dd995dSVitaly Kuznetsov { 2301adf8b46SAnshuman Khandual const int online_type = mhp_online_type_from_str(str); 2315f47adf7SDavid Hildenbrand 2325f47adf7SDavid Hildenbrand if (online_type >= 0) 2331adf8b46SAnshuman Khandual mhp_default_online_type = online_type; 23486dd995dSVitaly Kuznetsov 23586dd995dSVitaly Kuznetsov return 1; 23686dd995dSVitaly Kuznetsov } 23786dd995dSVitaly Kuznetsov __setup("memhp_default_state=", setup_memhp_default_state); 23886dd995dSVitaly Kuznetsov 23930467e0bSDavid Rientjes void mem_hotplug_begin(void) 240bfc8c901SVladimir Davydov { 2413f906ba2SThomas Gleixner cpus_read_lock(); 2423f906ba2SThomas Gleixner percpu_down_write(&mem_hotplug_lock); 243bfc8c901SVladimir Davydov } 244bfc8c901SVladimir Davydov 24530467e0bSDavid Rientjes void mem_hotplug_done(void) 246bfc8c901SVladimir Davydov { 2473f906ba2SThomas Gleixner percpu_up_write(&mem_hotplug_lock); 2483f906ba2SThomas Gleixner cpus_read_unlock(); 249bfc8c901SVladimir Davydov } 25020d6c96bSKOSAKI Motohiro 251357b4da5SJuergen Gross u64 max_mem_size = U64_MAX; 252357b4da5SJuergen Gross 25345e0b78bSKeith Mannthey /* add this memory to iomem resource */ 2547b7b2721SDavid Hildenbrand static struct resource *register_memory_resource(u64 start, u64 size, 2557b7b2721SDavid Hildenbrand const char *resource_name) 25645e0b78bSKeith Mannthey { 2572794129eSDave Hansen struct resource *res; 2582794129eSDave Hansen unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 2597b7b2721SDavid Hildenbrand 2607b7b2721SDavid Hildenbrand if (strcmp(resource_name, "System RAM")) 2617cf603d1SDavid Hildenbrand flags |= IORESOURCE_SYSRAM_DRIVER_MANAGED; 262357b4da5SJuergen Gross 263bca3feaaSAnshuman Khandual if (!mhp_range_allowed(start, size, true)) 264bca3feaaSAnshuman Khandual return ERR_PTR(-E2BIG); 265bca3feaaSAnshuman Khandual 266f3cd4c86SBaoquan He /* 267f3cd4c86SBaoquan He * Make sure value parsed from 'mem=' only restricts memory adding 268f3cd4c86SBaoquan He * while booting, so that memory hotplug won't be impacted. Please 269f3cd4c86SBaoquan He * refer to document of 'mem=' in kernel-parameters.txt for more 270f3cd4c86SBaoquan He * details. 271f3cd4c86SBaoquan He */ 272f3cd4c86SBaoquan He if (start + size > max_mem_size && system_state < SYSTEM_RUNNING) 273357b4da5SJuergen Gross return ERR_PTR(-E2BIG); 274357b4da5SJuergen Gross 2752794129eSDave Hansen /* 2762794129eSDave Hansen * Request ownership of the new memory range. This might be 2772794129eSDave Hansen * a child of an existing resource that was present but 2782794129eSDave Hansen * not marked as busy. 2792794129eSDave Hansen */ 2802794129eSDave Hansen res = __request_region(&iomem_resource, start, size, 2812794129eSDave Hansen resource_name, flags); 28245e0b78bSKeith Mannthey 2832794129eSDave Hansen if (!res) { 2842794129eSDave Hansen pr_debug("Unable to reserve System RAM region: %016llx->%016llx\n", 2852794129eSDave Hansen start, start + size); 2866f754ba4SVitaly Kuznetsov return ERR_PTR(-EEXIST); 28745e0b78bSKeith Mannthey } 28845e0b78bSKeith Mannthey return res; 28945e0b78bSKeith Mannthey } 29045e0b78bSKeith Mannthey 29145e0b78bSKeith Mannthey static void release_memory_resource(struct resource *res) 29245e0b78bSKeith Mannthey { 29345e0b78bSKeith Mannthey if (!res) 29445e0b78bSKeith Mannthey return; 29545e0b78bSKeith Mannthey release_resource(res); 29645e0b78bSKeith Mannthey kfree(res); 29745e0b78bSKeith Mannthey } 29845e0b78bSKeith Mannthey 299943189dbSAnshuman Khandual static int check_pfn_span(unsigned long pfn, unsigned long nr_pages) 3007ea62160SDan Williams { 3017ea62160SDan Williams /* 3027ea62160SDan Williams * Disallow all operations smaller than a sub-section and only 3037ea62160SDan Williams * allow operations smaller than a section for 3047ea62160SDan Williams * SPARSEMEM_VMEMMAP. Note that check_hotplug_memory_range() 3057ea62160SDan Williams * enforces a larger memory_block_size_bytes() granularity for 3067ea62160SDan Williams * memory that will be marked online, so this check should only 3077ea62160SDan Williams * fire for direct arch_{add,remove}_memory() users outside of 3087ea62160SDan Williams * add_memory_resource(). 3097ea62160SDan Williams */ 3107ea62160SDan Williams unsigned long min_align; 3117ea62160SDan Williams 3127ea62160SDan Williams if (IS_ENABLED(CONFIG_SPARSEMEM_VMEMMAP)) 3137ea62160SDan Williams min_align = PAGES_PER_SUBSECTION; 3147ea62160SDan Williams else 3157ea62160SDan Williams min_align = PAGES_PER_SECTION; 316943189dbSAnshuman Khandual if (!IS_ALIGNED(pfn | nr_pages, min_align)) 3177ea62160SDan Williams return -EINVAL; 3187ea62160SDan Williams return 0; 3197ea62160SDan Williams } 3207ea62160SDan Williams 3214edd7cefSDavid Rientjes /* 3229f605f26SDan Williams * Return page for the valid pfn only if the page is online. All pfn 3239f605f26SDan Williams * walkers which rely on the fully initialized page->flags and others 3249f605f26SDan Williams * should use this rather than pfn_valid && pfn_to_page 3259f605f26SDan Williams */ 3269f605f26SDan Williams struct page *pfn_to_online_page(unsigned long pfn) 3279f605f26SDan Williams { 3289f605f26SDan Williams unsigned long nr = pfn_to_section_nr(pfn); 3291f90a347SDan Williams struct dev_pagemap *pgmap; 3309f9b02e5SDan Williams struct mem_section *ms; 3319f605f26SDan Williams 3329f9b02e5SDan Williams if (nr >= NR_MEM_SECTIONS) 3339f605f26SDan Williams return NULL; 3349f9b02e5SDan Williams 3359f9b02e5SDan Williams ms = __nr_to_section(nr); 3369f9b02e5SDan Williams if (!online_section(ms)) 3379f9b02e5SDan Williams return NULL; 3389f9b02e5SDan Williams 3399f9b02e5SDan Williams /* 3409f9b02e5SDan Williams * Save some code text when online_section() + 3419f9b02e5SDan Williams * pfn_section_valid() are sufficient. 3429f9b02e5SDan Williams */ 3439f9b02e5SDan Williams if (IS_ENABLED(CONFIG_HAVE_ARCH_PFN_VALID) && !pfn_valid(pfn)) 3449f9b02e5SDan Williams return NULL; 3459f9b02e5SDan Williams 3469f9b02e5SDan Williams if (!pfn_section_valid(ms, pfn)) 3479f9b02e5SDan Williams return NULL; 3489f9b02e5SDan Williams 3491f90a347SDan Williams if (!online_device_section(ms)) 3501f90a347SDan Williams return pfn_to_page(pfn); 3511f90a347SDan Williams 3521f90a347SDan Williams /* 3531f90a347SDan Williams * Slowpath: when ZONE_DEVICE collides with 3541f90a347SDan Williams * ZONE_{NORMAL,MOVABLE} within the same section some pfns in 3551f90a347SDan Williams * the section may be 'offline' but 'valid'. Only 3561f90a347SDan Williams * get_dev_pagemap() can determine sub-section online status. 3571f90a347SDan Williams */ 3581f90a347SDan Williams pgmap = get_dev_pagemap(pfn, NULL); 3591f90a347SDan Williams put_dev_pagemap(pgmap); 3601f90a347SDan Williams 3611f90a347SDan Williams /* The presence of a pgmap indicates ZONE_DEVICE offline pfn */ 3621f90a347SDan Williams if (pgmap) 3631f90a347SDan Williams return NULL; 3641f90a347SDan Williams 3659f9b02e5SDan Williams return pfn_to_page(pfn); 3669f605f26SDan Williams } 3679f605f26SDan Williams EXPORT_SYMBOL_GPL(pfn_to_online_page); 3689f605f26SDan Williams 3697ea62160SDan Williams int __ref __add_pages(int nid, unsigned long pfn, unsigned long nr_pages, 370f5637d3bSLogan Gunthorpe struct mhp_params *params) 3714edd7cefSDavid Rientjes { 3726cdd0b30SDavid Hildenbrand const unsigned long end_pfn = pfn + nr_pages; 3736cdd0b30SDavid Hildenbrand unsigned long cur_nr_pages; 3749a845030SDan Williams int err; 375f5637d3bSLogan Gunthorpe struct vmem_altmap *altmap = params->altmap; 3764b94ffdcSDan Williams 3776366238bSliusongtang if (WARN_ON_ONCE(!pgprot_val(params->pgprot))) 378bfeb022fSLogan Gunthorpe return -EINVAL; 379bfeb022fSLogan Gunthorpe 380bca3feaaSAnshuman Khandual VM_BUG_ON(!mhp_range_allowed(PFN_PHYS(pfn), nr_pages * PAGE_SIZE, false)); 381dca4436dSAlastair D'Silva 3824b94ffdcSDan Williams if (altmap) { 3834b94ffdcSDan Williams /* 3844b94ffdcSDan Williams * Validate altmap is within bounds of the total request 3854b94ffdcSDan Williams */ 3867ea62160SDan Williams if (altmap->base_pfn != pfn 3874b94ffdcSDan Williams || vmem_altmap_offset(altmap) > nr_pages) { 3884b94ffdcSDan Williams pr_warn_once("memory add fail, invalid altmap\n"); 3897ea62160SDan Williams return -EINVAL; 3904b94ffdcSDan Williams } 3914b94ffdcSDan Williams altmap->alloc = 0; 3924b94ffdcSDan Williams } 3934b94ffdcSDan Williams 394943189dbSAnshuman Khandual if (check_pfn_span(pfn, nr_pages)) { 39550135045SRick Wertenbroek WARN(1, "Misaligned %s start: %#lx end: %#lx\n", __func__, pfn, pfn + nr_pages - 1); 396943189dbSAnshuman Khandual return -EINVAL; 397943189dbSAnshuman Khandual } 3987ea62160SDan Williams 3996cdd0b30SDavid Hildenbrand for (; pfn < end_pfn; pfn += cur_nr_pages) { 4006cdd0b30SDavid Hildenbrand /* Select all remaining pages up to the next section boundary */ 4016cdd0b30SDavid Hildenbrand cur_nr_pages = min(end_pfn - pfn, 4026cdd0b30SDavid Hildenbrand SECTION_ALIGN_UP(pfn + 1) - pfn); 403e3246d8fSJoao Martins err = sparse_add_section(nid, pfn, cur_nr_pages, altmap, 404e3246d8fSJoao Martins params->pgmap); 405ba72b4c8SDan Williams if (err) 406ba72b4c8SDan Williams break; 407f64ac5e6SMichal Hocko cond_resched(); 4084edd7cefSDavid Rientjes } 409c435a390SZhu Guihua vmemmap_populate_print_last(); 4104edd7cefSDavid Rientjes return err; 4114edd7cefSDavid Rientjes } 4124edd7cefSDavid Rientjes 413815121d2SYasuaki Ishimatsu /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ 414d09b0137SYASUAKI ISHIMATSU static unsigned long find_smallest_section_pfn(int nid, struct zone *zone, 415815121d2SYasuaki Ishimatsu unsigned long start_pfn, 416815121d2SYasuaki Ishimatsu unsigned long end_pfn) 417815121d2SYasuaki Ishimatsu { 41849ba3c6bSDan Williams for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SUBSECTION) { 4197ce700bfSDavid Hildenbrand if (unlikely(!pfn_to_online_page(start_pfn))) 420815121d2SYasuaki Ishimatsu continue; 421815121d2SYasuaki Ishimatsu 422815121d2SYasuaki Ishimatsu if (unlikely(pfn_to_nid(start_pfn) != nid)) 423815121d2SYasuaki Ishimatsu continue; 424815121d2SYasuaki Ishimatsu 4259b05158fSDavid Hildenbrand if (zone != page_zone(pfn_to_page(start_pfn))) 426815121d2SYasuaki Ishimatsu continue; 427815121d2SYasuaki Ishimatsu 428815121d2SYasuaki Ishimatsu return start_pfn; 429815121d2SYasuaki Ishimatsu } 430815121d2SYasuaki Ishimatsu 431815121d2SYasuaki Ishimatsu return 0; 432815121d2SYasuaki Ishimatsu } 433815121d2SYasuaki Ishimatsu 434815121d2SYasuaki Ishimatsu /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ 435d09b0137SYASUAKI ISHIMATSU static unsigned long find_biggest_section_pfn(int nid, struct zone *zone, 436815121d2SYasuaki Ishimatsu unsigned long start_pfn, 437815121d2SYasuaki Ishimatsu unsigned long end_pfn) 438815121d2SYasuaki Ishimatsu { 439815121d2SYasuaki Ishimatsu unsigned long pfn; 440815121d2SYasuaki Ishimatsu 441815121d2SYasuaki Ishimatsu /* pfn is the end pfn of a memory section. */ 442815121d2SYasuaki Ishimatsu pfn = end_pfn - 1; 44349ba3c6bSDan Williams for (; pfn >= start_pfn; pfn -= PAGES_PER_SUBSECTION) { 4447ce700bfSDavid Hildenbrand if (unlikely(!pfn_to_online_page(pfn))) 445815121d2SYasuaki Ishimatsu continue; 446815121d2SYasuaki Ishimatsu 447815121d2SYasuaki Ishimatsu if (unlikely(pfn_to_nid(pfn) != nid)) 448815121d2SYasuaki Ishimatsu continue; 449815121d2SYasuaki Ishimatsu 4509b05158fSDavid Hildenbrand if (zone != page_zone(pfn_to_page(pfn))) 451815121d2SYasuaki Ishimatsu continue; 452815121d2SYasuaki Ishimatsu 453815121d2SYasuaki Ishimatsu return pfn; 454815121d2SYasuaki Ishimatsu } 455815121d2SYasuaki Ishimatsu 456815121d2SYasuaki Ishimatsu return 0; 457815121d2SYasuaki Ishimatsu } 458815121d2SYasuaki Ishimatsu 459815121d2SYasuaki Ishimatsu static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, 460815121d2SYasuaki Ishimatsu unsigned long end_pfn) 461815121d2SYasuaki Ishimatsu { 462815121d2SYasuaki Ishimatsu unsigned long pfn; 463815121d2SYasuaki Ishimatsu int nid = zone_to_nid(zone); 464815121d2SYasuaki Ishimatsu 4655d12071cSDavid Hildenbrand if (zone->zone_start_pfn == start_pfn) { 466815121d2SYasuaki Ishimatsu /* 467815121d2SYasuaki Ishimatsu * If the section is smallest section in the zone, it need 468815121d2SYasuaki Ishimatsu * shrink zone->zone_start_pfn and zone->zone_spanned_pages. 469815121d2SYasuaki Ishimatsu * In this case, we find second smallest valid mem_section 470815121d2SYasuaki Ishimatsu * for shrinking zone. 471815121d2SYasuaki Ishimatsu */ 472815121d2SYasuaki Ishimatsu pfn = find_smallest_section_pfn(nid, zone, end_pfn, 4735d12071cSDavid Hildenbrand zone_end_pfn(zone)); 474815121d2SYasuaki Ishimatsu if (pfn) { 4755d12071cSDavid Hildenbrand zone->spanned_pages = zone_end_pfn(zone) - pfn; 476815121d2SYasuaki Ishimatsu zone->zone_start_pfn = pfn; 477950b68d9SDavid Hildenbrand } else { 478950b68d9SDavid Hildenbrand zone->zone_start_pfn = 0; 479950b68d9SDavid Hildenbrand zone->spanned_pages = 0; 480815121d2SYasuaki Ishimatsu } 4815d12071cSDavid Hildenbrand } else if (zone_end_pfn(zone) == end_pfn) { 482815121d2SYasuaki Ishimatsu /* 483815121d2SYasuaki Ishimatsu * If the section is biggest section in the zone, it need 484815121d2SYasuaki Ishimatsu * shrink zone->spanned_pages. 485815121d2SYasuaki Ishimatsu * In this case, we find second biggest valid mem_section for 486815121d2SYasuaki Ishimatsu * shrinking zone. 487815121d2SYasuaki Ishimatsu */ 4885d12071cSDavid Hildenbrand pfn = find_biggest_section_pfn(nid, zone, zone->zone_start_pfn, 489815121d2SYasuaki Ishimatsu start_pfn); 490815121d2SYasuaki Ishimatsu if (pfn) 4915d12071cSDavid Hildenbrand zone->spanned_pages = pfn - zone->zone_start_pfn + 1; 492950b68d9SDavid Hildenbrand else { 493815121d2SYasuaki Ishimatsu zone->zone_start_pfn = 0; 494815121d2SYasuaki Ishimatsu zone->spanned_pages = 0; 495950b68d9SDavid Hildenbrand } 496950b68d9SDavid Hildenbrand } 497815121d2SYasuaki Ishimatsu } 498815121d2SYasuaki Ishimatsu 49900d6c019SDavid Hildenbrand static void update_pgdat_span(struct pglist_data *pgdat) 500815121d2SYasuaki Ishimatsu { 50100d6c019SDavid Hildenbrand unsigned long node_start_pfn = 0, node_end_pfn = 0; 50200d6c019SDavid Hildenbrand struct zone *zone; 503815121d2SYasuaki Ishimatsu 50400d6c019SDavid Hildenbrand for (zone = pgdat->node_zones; 50500d6c019SDavid Hildenbrand zone < pgdat->node_zones + MAX_NR_ZONES; zone++) { 5066c922cf7SMiaohe Lin unsigned long end_pfn = zone_end_pfn(zone); 50700d6c019SDavid Hildenbrand 50800d6c019SDavid Hildenbrand /* No need to lock the zones, they can't change. */ 509656d5711SDavid Hildenbrand if (!zone->spanned_pages) 510656d5711SDavid Hildenbrand continue; 511656d5711SDavid Hildenbrand if (!node_end_pfn) { 512656d5711SDavid Hildenbrand node_start_pfn = zone->zone_start_pfn; 5136c922cf7SMiaohe Lin node_end_pfn = end_pfn; 514656d5711SDavid Hildenbrand continue; 515656d5711SDavid Hildenbrand } 516656d5711SDavid Hildenbrand 5176c922cf7SMiaohe Lin if (end_pfn > node_end_pfn) 5186c922cf7SMiaohe Lin node_end_pfn = end_pfn; 51900d6c019SDavid Hildenbrand if (zone->zone_start_pfn < node_start_pfn) 52000d6c019SDavid Hildenbrand node_start_pfn = zone->zone_start_pfn; 521815121d2SYasuaki Ishimatsu } 522815121d2SYasuaki Ishimatsu 52300d6c019SDavid Hildenbrand pgdat->node_start_pfn = node_start_pfn; 52400d6c019SDavid Hildenbrand pgdat->node_spanned_pages = node_end_pfn - node_start_pfn; 525815121d2SYasuaki Ishimatsu } 526815121d2SYasuaki Ishimatsu 527feee6b29SDavid Hildenbrand void __ref remove_pfn_range_from_zone(struct zone *zone, 528feee6b29SDavid Hildenbrand unsigned long start_pfn, 5297ea62160SDan Williams unsigned long nr_pages) 530815121d2SYasuaki Ishimatsu { 531b7e3debdSBen Widawsky const unsigned long end_pfn = start_pfn + nr_pages; 532815121d2SYasuaki Ishimatsu struct pglist_data *pgdat = zone->zone_pgdat; 53327cacaadSOscar Salvador unsigned long pfn, cur_nr_pages; 534815121d2SYasuaki Ishimatsu 535d33695b1SDavid Hildenbrand /* Poison struct pages because they are now uninitialized again. */ 536b7e3debdSBen Widawsky for (pfn = start_pfn; pfn < end_pfn; pfn += cur_nr_pages) { 537b7e3debdSBen Widawsky cond_resched(); 538b7e3debdSBen Widawsky 539b7e3debdSBen Widawsky /* Select all remaining pages up to the next section boundary */ 540b7e3debdSBen Widawsky cur_nr_pages = 541b7e3debdSBen Widawsky min(end_pfn - pfn, SECTION_ALIGN_UP(pfn + 1) - pfn); 542b7e3debdSBen Widawsky page_init_poison(pfn_to_page(pfn), 543b7e3debdSBen Widawsky sizeof(struct page) * cur_nr_pages); 544b7e3debdSBen Widawsky } 545d33695b1SDavid Hildenbrand 5467ce700bfSDavid Hildenbrand /* 5477ce700bfSDavid Hildenbrand * Zone shrinking code cannot properly deal with ZONE_DEVICE. So 5487ce700bfSDavid Hildenbrand * we will not try to shrink the zones - which is okay as 5497ce700bfSDavid Hildenbrand * set_zone_contiguous() cannot deal with ZONE_DEVICE either way. 5507ce700bfSDavid Hildenbrand */ 5515ef5f810SMiaohe Lin if (zone_is_zone_device(zone)) 5527ce700bfSDavid Hildenbrand return; 5537ce700bfSDavid Hildenbrand 554feee6b29SDavid Hildenbrand clear_zone_contiguous(zone); 555feee6b29SDavid Hildenbrand 556815121d2SYasuaki Ishimatsu shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); 55700d6c019SDavid Hildenbrand update_pgdat_span(pgdat); 558feee6b29SDavid Hildenbrand 559feee6b29SDavid Hildenbrand set_zone_contiguous(zone); 560815121d2SYasuaki Ishimatsu } 561815121d2SYasuaki Ishimatsu 562ea01ea93SBadari Pulavarty /** 563feee6b29SDavid Hildenbrand * __remove_pages() - remove sections of pages 5647ea62160SDan Williams * @pfn: starting pageframe (must be aligned to start of a section) 565ea01ea93SBadari Pulavarty * @nr_pages: number of pages to remove (must be multiple of section size) 566e8b098fcSMike Rapoport * @altmap: alternative device page map or %NULL if default memmap is used 567ea01ea93SBadari Pulavarty * 568ea01ea93SBadari Pulavarty * Generic helper function to remove section mappings and sysfs entries 569ea01ea93SBadari Pulavarty * for the section of the memory we are removing. Caller needs to make 570ea01ea93SBadari Pulavarty * sure that pages are marked reserved and zones are adjust properly by 571ea01ea93SBadari Pulavarty * calling offline_pages(). 572ea01ea93SBadari Pulavarty */ 573feee6b29SDavid Hildenbrand void __remove_pages(unsigned long pfn, unsigned long nr_pages, 574feee6b29SDavid Hildenbrand struct vmem_altmap *altmap) 575ea01ea93SBadari Pulavarty { 57652fb87c8SDavid Hildenbrand const unsigned long end_pfn = pfn + nr_pages; 57752fb87c8SDavid Hildenbrand unsigned long cur_nr_pages; 578ea01ea93SBadari Pulavarty 579943189dbSAnshuman Khandual if (check_pfn_span(pfn, nr_pages)) { 58050135045SRick Wertenbroek WARN(1, "Misaligned %s start: %#lx end: %#lx\n", __func__, pfn, pfn + nr_pages - 1); 5817ea62160SDan Williams return; 582943189dbSAnshuman Khandual } 583ea01ea93SBadari Pulavarty 58452fb87c8SDavid Hildenbrand for (; pfn < end_pfn; pfn += cur_nr_pages) { 585dd33ad7bSMichal Hocko cond_resched(); 58652fb87c8SDavid Hildenbrand /* Select all remaining pages up to the next section boundary */ 587a11b9419SDavid Hildenbrand cur_nr_pages = min(end_pfn - pfn, 588a11b9419SDavid Hildenbrand SECTION_ALIGN_UP(pfn + 1) - pfn); 589bd5f79abSYajun Deng sparse_remove_section(pfn, cur_nr_pages, altmap); 590ea01ea93SBadari Pulavarty } 591ea01ea93SBadari Pulavarty } 592ea01ea93SBadari Pulavarty 5939d0ad8caSDaniel Kiper int set_online_page_callback(online_page_callback_t callback) 5949d0ad8caSDaniel Kiper { 5959d0ad8caSDaniel Kiper int rc = -EINVAL; 5969d0ad8caSDaniel Kiper 597bfc8c901SVladimir Davydov get_online_mems(); 598bfc8c901SVladimir Davydov mutex_lock(&online_page_callback_lock); 5999d0ad8caSDaniel Kiper 6009d0ad8caSDaniel Kiper if (online_page_callback == generic_online_page) { 6019d0ad8caSDaniel Kiper online_page_callback = callback; 6029d0ad8caSDaniel Kiper rc = 0; 6039d0ad8caSDaniel Kiper } 6049d0ad8caSDaniel Kiper 605bfc8c901SVladimir Davydov mutex_unlock(&online_page_callback_lock); 606bfc8c901SVladimir Davydov put_online_mems(); 6079d0ad8caSDaniel Kiper 6089d0ad8caSDaniel Kiper return rc; 6099d0ad8caSDaniel Kiper } 6109d0ad8caSDaniel Kiper EXPORT_SYMBOL_GPL(set_online_page_callback); 6119d0ad8caSDaniel Kiper 6129d0ad8caSDaniel Kiper int restore_online_page_callback(online_page_callback_t callback) 6139d0ad8caSDaniel Kiper { 6149d0ad8caSDaniel Kiper int rc = -EINVAL; 6159d0ad8caSDaniel Kiper 616bfc8c901SVladimir Davydov get_online_mems(); 617bfc8c901SVladimir Davydov mutex_lock(&online_page_callback_lock); 6189d0ad8caSDaniel Kiper 6199d0ad8caSDaniel Kiper if (online_page_callback == callback) { 6209d0ad8caSDaniel Kiper online_page_callback = generic_online_page; 6219d0ad8caSDaniel Kiper rc = 0; 6229d0ad8caSDaniel Kiper } 6239d0ad8caSDaniel Kiper 624bfc8c901SVladimir Davydov mutex_unlock(&online_page_callback_lock); 625bfc8c901SVladimir Davydov put_online_mems(); 6269d0ad8caSDaniel Kiper 6279d0ad8caSDaniel Kiper return rc; 6289d0ad8caSDaniel Kiper } 6299d0ad8caSDaniel Kiper EXPORT_SYMBOL_GPL(restore_online_page_callback); 6309d0ad8caSDaniel Kiper 63118db1491SDavid Hildenbrand void generic_online_page(struct page *page, unsigned int order) 6329d0ad8caSDaniel Kiper { 633c87cbc1fSVlastimil Babka /* 634c87cbc1fSVlastimil Babka * Freeing the page with debug_pagealloc enabled will try to unmap it, 635c87cbc1fSVlastimil Babka * so we should map it first. This is better than introducing a special 636c87cbc1fSVlastimil Babka * case in page freeing fast path. 637c87cbc1fSVlastimil Babka */ 63877bc7fd6SMike Rapoport debug_pagealloc_map_pages(page, 1 << order); 639a9cd410aSArun KS __free_pages_core(page, order); 640a9cd410aSArun KS totalram_pages_add(1UL << order); 641a9cd410aSArun KS } 64218db1491SDavid Hildenbrand EXPORT_SYMBOL_GPL(generic_online_page); 643a9cd410aSArun KS 644aac65321SDavid Hildenbrand static void online_pages_range(unsigned long start_pfn, unsigned long nr_pages) 6453947be19SDave Hansen { 646b2c2ab20SDavid Hildenbrand const unsigned long end_pfn = start_pfn + nr_pages; 647b2c2ab20SDavid Hildenbrand unsigned long pfn; 6482d070eabSMichal Hocko 649b2c2ab20SDavid Hildenbrand /* 6505e0a760bSKirill A. Shutemov * Online the pages in MAX_PAGE_ORDER aligned chunks. The callback might 651aac65321SDavid Hildenbrand * decide to not expose all pages to the buddy (e.g., expose them 652aac65321SDavid Hildenbrand * later). We account all pages as being online and belonging to this 653aac65321SDavid Hildenbrand * zone ("present"). 654a08a2ae3SOscar Salvador * When using memmap_on_memory, the range might not be aligned to 655a08a2ae3SOscar Salvador * MAX_ORDER_NR_PAGES - 1, but pageblock aligned. __ffs() will detect 656a08a2ae3SOscar Salvador * this and the first chunk to online will be pageblock_nr_pages. 657b2c2ab20SDavid Hildenbrand */ 658a08a2ae3SOscar Salvador for (pfn = start_pfn; pfn < end_pfn;) { 65959f876fbSKirill A. Shutemov int order; 66059f876fbSKirill A. Shutemov 66159f876fbSKirill A. Shutemov /* 66259f876fbSKirill A. Shutemov * Free to online pages in the largest chunks alignment allows. 66359f876fbSKirill A. Shutemov * 66459f876fbSKirill A. Shutemov * __ffs() behaviour is undefined for 0. start == 0 is 6655e0a760bSKirill A. Shutemov * MAX_PAGE_ORDER-aligned, Set order to MAX_PAGE_ORDER for 6665e0a760bSKirill A. Shutemov * the case. 66759f876fbSKirill A. Shutemov */ 66859f876fbSKirill A. Shutemov if (pfn) 6695e0a760bSKirill A. Shutemov order = min_t(int, MAX_PAGE_ORDER, __ffs(pfn)); 67059f876fbSKirill A. Shutemov else 6715e0a760bSKirill A. Shutemov order = MAX_PAGE_ORDER; 672a08a2ae3SOscar Salvador 673a08a2ae3SOscar Salvador (*online_page_callback)(pfn_to_page(pfn), order); 674a08a2ae3SOscar Salvador pfn += (1UL << order); 675a08a2ae3SOscar Salvador } 6762d070eabSMichal Hocko 677b2c2ab20SDavid Hildenbrand /* mark all involved sections as online */ 678b2c2ab20SDavid Hildenbrand online_mem_sections(start_pfn, end_pfn); 67975884fb1SKAMEZAWA Hiroyuki } 68075884fb1SKAMEZAWA Hiroyuki 681d9713679SLai Jiangshan /* check which state of node_states will be changed when online memory */ 682d9713679SLai Jiangshan static void node_states_check_changes_online(unsigned long nr_pages, 683d9713679SLai Jiangshan struct zone *zone, struct memory_notify *arg) 684d9713679SLai Jiangshan { 685d9713679SLai Jiangshan int nid = zone_to_nid(zone); 686d9713679SLai Jiangshan 68798fa15f3SAnshuman Khandual arg->status_change_nid = NUMA_NO_NODE; 68898fa15f3SAnshuman Khandual arg->status_change_nid_normal = NUMA_NO_NODE; 6896715ddf9SLai Jiangshan 6906715ddf9SLai Jiangshan if (!node_state(nid, N_MEMORY)) 691d9713679SLai Jiangshan arg->status_change_nid = nid; 6928efe33f4SOscar Salvador if (zone_idx(zone) <= ZONE_NORMAL && !node_state(nid, N_NORMAL_MEMORY)) 6938efe33f4SOscar Salvador arg->status_change_nid_normal = nid; 694d9713679SLai Jiangshan } 695d9713679SLai Jiangshan 696d9713679SLai Jiangshan static void node_states_set_node(int node, struct memory_notify *arg) 697d9713679SLai Jiangshan { 698d9713679SLai Jiangshan if (arg->status_change_nid_normal >= 0) 699d9713679SLai Jiangshan node_set_state(node, N_NORMAL_MEMORY); 700d9713679SLai Jiangshan 70183d83612SOscar Salvador if (arg->status_change_nid >= 0) 7026715ddf9SLai Jiangshan node_set_state(node, N_MEMORY); 703d9713679SLai Jiangshan } 704d9713679SLai Jiangshan 705f1dd2cd1SMichal Hocko static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, 706f1dd2cd1SMichal Hocko unsigned long nr_pages) 707f1dd2cd1SMichal Hocko { 708f1dd2cd1SMichal Hocko unsigned long old_end_pfn = zone_end_pfn(zone); 709f1dd2cd1SMichal Hocko 710f1dd2cd1SMichal Hocko if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) 711f1dd2cd1SMichal Hocko zone->zone_start_pfn = start_pfn; 712f1dd2cd1SMichal Hocko 713f1dd2cd1SMichal Hocko zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn; 714f1dd2cd1SMichal Hocko } 715f1dd2cd1SMichal Hocko 716f1dd2cd1SMichal Hocko static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned long start_pfn, 717f1dd2cd1SMichal Hocko unsigned long nr_pages) 718f1dd2cd1SMichal Hocko { 719f1dd2cd1SMichal Hocko unsigned long old_end_pfn = pgdat_end_pfn(pgdat); 720f1dd2cd1SMichal Hocko 721f1dd2cd1SMichal Hocko if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) 722f1dd2cd1SMichal Hocko pgdat->node_start_pfn = start_pfn; 723f1dd2cd1SMichal Hocko 724f1dd2cd1SMichal Hocko pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn; 725f1dd2cd1SMichal Hocko 7263fccb74cSDavid Hildenbrand } 7271f90a347SDan Williams 728ed7802ddSMuchun Song #ifdef CONFIG_ZONE_DEVICE 7291f90a347SDan Williams static void section_taint_zone_device(unsigned long pfn) 7301f90a347SDan Williams { 7311f90a347SDan Williams struct mem_section *ms = __pfn_to_section(pfn); 7321f90a347SDan Williams 7331f90a347SDan Williams ms->section_mem_map |= SECTION_TAINT_ZONE_DEVICE; 7341f90a347SDan Williams } 735ed7802ddSMuchun Song #else 736ed7802ddSMuchun Song static inline void section_taint_zone_device(unsigned long pfn) 737ed7802ddSMuchun Song { 738ed7802ddSMuchun Song } 739ed7802ddSMuchun Song #endif 7401f90a347SDan Williams 7413fccb74cSDavid Hildenbrand /* 7423fccb74cSDavid Hildenbrand * Associate the pfn range with the given zone, initializing the memmaps 7433fccb74cSDavid Hildenbrand * and resizing the pgdat/zone data to span the added pages. After this 7443fccb74cSDavid Hildenbrand * call, all affected pages are PG_reserved. 745d882c006SDavid Hildenbrand * 746d882c006SDavid Hildenbrand * All aligned pageblocks are initialized to the specified migratetype 747d882c006SDavid Hildenbrand * (usually MIGRATE_MOVABLE). Besides setting the migratetype, no related 748d882c006SDavid Hildenbrand * zone stats (e.g., nr_isolate_pageblock) are touched. 7493fccb74cSDavid Hildenbrand */ 750a99583e7SChristoph Hellwig void __ref move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, 751d882c006SDavid Hildenbrand unsigned long nr_pages, 752d882c006SDavid Hildenbrand struct vmem_altmap *altmap, int migratetype) 753f1dd2cd1SMichal Hocko { 754f1dd2cd1SMichal Hocko struct pglist_data *pgdat = zone->zone_pgdat; 755f1dd2cd1SMichal Hocko int nid = pgdat->node_id; 756f1dd2cd1SMichal Hocko 757f1dd2cd1SMichal Hocko clear_zone_contiguous(zone); 758f1dd2cd1SMichal Hocko 759fa004ab7SWei Yang if (zone_is_empty(zone)) 760fa004ab7SWei Yang init_currently_empty_zone(zone, start_pfn, nr_pages); 761f1dd2cd1SMichal Hocko resize_zone_range(zone, start_pfn, nr_pages); 762f1dd2cd1SMichal Hocko resize_pgdat_range(pgdat, start_pfn, nr_pages); 763f1dd2cd1SMichal Hocko 764f1dd2cd1SMichal Hocko /* 7651f90a347SDan Williams * Subsection population requires care in pfn_to_online_page(). 7661f90a347SDan Williams * Set the taint to enable the slow path detection of 7671f90a347SDan Williams * ZONE_DEVICE pages in an otherwise ZONE_{NORMAL,MOVABLE} 7681f90a347SDan Williams * section. 7691f90a347SDan Williams */ 7701f90a347SDan Williams if (zone_is_zone_device(zone)) { 7711f90a347SDan Williams if (!IS_ALIGNED(start_pfn, PAGES_PER_SECTION)) 7721f90a347SDan Williams section_taint_zone_device(start_pfn); 7731f90a347SDan Williams if (!IS_ALIGNED(start_pfn + nr_pages, PAGES_PER_SECTION)) 7741f90a347SDan Williams section_taint_zone_device(start_pfn + nr_pages); 7751f90a347SDan Williams } 7761f90a347SDan Williams 7771f90a347SDan Williams /* 778f1dd2cd1SMichal Hocko * TODO now we have a visible range of pages which are not associated 779f1dd2cd1SMichal Hocko * with their zone properly. Not nice but set_pfnblock_flags_mask 780f1dd2cd1SMichal Hocko * expects the zone spans the pfn range. All the pages in the range 781f1dd2cd1SMichal Hocko * are reserved so nobody should be touching them so we should be safe 782f1dd2cd1SMichal Hocko */ 783ab28cb6eSBaoquan He memmap_init_range(nr_pages, nid, zone_idx(zone), start_pfn, 0, 784d882c006SDavid Hildenbrand MEMINIT_HOTPLUG, altmap, migratetype); 785f1dd2cd1SMichal Hocko 786f1dd2cd1SMichal Hocko set_zone_contiguous(zone); 787f1dd2cd1SMichal Hocko } 788f1dd2cd1SMichal Hocko 789e83a437fSDavid Hildenbrand struct auto_movable_stats { 790e83a437fSDavid Hildenbrand unsigned long kernel_early_pages; 791e83a437fSDavid Hildenbrand unsigned long movable_pages; 792e83a437fSDavid Hildenbrand }; 793e83a437fSDavid Hildenbrand 794e83a437fSDavid Hildenbrand static void auto_movable_stats_account_zone(struct auto_movable_stats *stats, 795e83a437fSDavid Hildenbrand struct zone *zone) 796e83a437fSDavid Hildenbrand { 797e83a437fSDavid Hildenbrand if (zone_idx(zone) == ZONE_MOVABLE) { 798e83a437fSDavid Hildenbrand stats->movable_pages += zone->present_pages; 799e83a437fSDavid Hildenbrand } else { 800e83a437fSDavid Hildenbrand stats->kernel_early_pages += zone->present_early_pages; 801e83a437fSDavid Hildenbrand #ifdef CONFIG_CMA 802e83a437fSDavid Hildenbrand /* 803e83a437fSDavid Hildenbrand * CMA pages (never on hotplugged memory) behave like 804e83a437fSDavid Hildenbrand * ZONE_MOVABLE. 805e83a437fSDavid Hildenbrand */ 806e83a437fSDavid Hildenbrand stats->movable_pages += zone->cma_pages; 807e83a437fSDavid Hildenbrand stats->kernel_early_pages -= zone->cma_pages; 808e83a437fSDavid Hildenbrand #endif /* CONFIG_CMA */ 809e83a437fSDavid Hildenbrand } 810e83a437fSDavid Hildenbrand } 8113fcebf90SDavid Hildenbrand struct auto_movable_group_stats { 8123fcebf90SDavid Hildenbrand unsigned long movable_pages; 8133fcebf90SDavid Hildenbrand unsigned long req_kernel_early_pages; 8143fcebf90SDavid Hildenbrand }; 815e83a437fSDavid Hildenbrand 8163fcebf90SDavid Hildenbrand static int auto_movable_stats_account_group(struct memory_group *group, 8173fcebf90SDavid Hildenbrand void *arg) 818e83a437fSDavid Hildenbrand { 8193fcebf90SDavid Hildenbrand const int ratio = READ_ONCE(auto_movable_ratio); 8203fcebf90SDavid Hildenbrand struct auto_movable_group_stats *stats = arg; 8213fcebf90SDavid Hildenbrand long pages; 8223fcebf90SDavid Hildenbrand 8233fcebf90SDavid Hildenbrand /* 8243fcebf90SDavid Hildenbrand * We don't support modifying the config while the auto-movable online 8253fcebf90SDavid Hildenbrand * policy is already enabled. Just avoid the division by zero below. 8263fcebf90SDavid Hildenbrand */ 8273fcebf90SDavid Hildenbrand if (!ratio) 8283fcebf90SDavid Hildenbrand return 0; 8293fcebf90SDavid Hildenbrand 8303fcebf90SDavid Hildenbrand /* 8313fcebf90SDavid Hildenbrand * Calculate how many early kernel pages this group requires to 8323fcebf90SDavid Hildenbrand * satisfy the configured zone ratio. 8333fcebf90SDavid Hildenbrand */ 8343fcebf90SDavid Hildenbrand pages = group->present_movable_pages * 100 / ratio; 8353fcebf90SDavid Hildenbrand pages -= group->present_kernel_pages; 8363fcebf90SDavid Hildenbrand 8373fcebf90SDavid Hildenbrand if (pages > 0) 8383fcebf90SDavid Hildenbrand stats->req_kernel_early_pages += pages; 8393fcebf90SDavid Hildenbrand stats->movable_pages += group->present_movable_pages; 8403fcebf90SDavid Hildenbrand return 0; 8413fcebf90SDavid Hildenbrand } 8423fcebf90SDavid Hildenbrand 8433fcebf90SDavid Hildenbrand static bool auto_movable_can_online_movable(int nid, struct memory_group *group, 8443fcebf90SDavid Hildenbrand unsigned long nr_pages) 8453fcebf90SDavid Hildenbrand { 846e83a437fSDavid Hildenbrand unsigned long kernel_early_pages, movable_pages; 8473fcebf90SDavid Hildenbrand struct auto_movable_group_stats group_stats = {}; 8483fcebf90SDavid Hildenbrand struct auto_movable_stats stats = {}; 849e83a437fSDavid Hildenbrand pg_data_t *pgdat = NODE_DATA(nid); 850e83a437fSDavid Hildenbrand struct zone *zone; 851e83a437fSDavid Hildenbrand int i; 852e83a437fSDavid Hildenbrand 853e83a437fSDavid Hildenbrand /* Walk all relevant zones and collect MOVABLE vs. KERNEL stats. */ 854e83a437fSDavid Hildenbrand if (nid == NUMA_NO_NODE) { 855e83a437fSDavid Hildenbrand /* TODO: cache values */ 856e83a437fSDavid Hildenbrand for_each_populated_zone(zone) 857e83a437fSDavid Hildenbrand auto_movable_stats_account_zone(&stats, zone); 858e83a437fSDavid Hildenbrand } else { 859e83a437fSDavid Hildenbrand for (i = 0; i < MAX_NR_ZONES; i++) { 860e83a437fSDavid Hildenbrand zone = pgdat->node_zones + i; 861e83a437fSDavid Hildenbrand if (populated_zone(zone)) 862e83a437fSDavid Hildenbrand auto_movable_stats_account_zone(&stats, zone); 863e83a437fSDavid Hildenbrand } 864e83a437fSDavid Hildenbrand } 865e83a437fSDavid Hildenbrand 866e83a437fSDavid Hildenbrand kernel_early_pages = stats.kernel_early_pages; 867e83a437fSDavid Hildenbrand movable_pages = stats.movable_pages; 868e83a437fSDavid Hildenbrand 869e83a437fSDavid Hildenbrand /* 8703fcebf90SDavid Hildenbrand * Kernel memory inside dynamic memory group allows for more MOVABLE 8713fcebf90SDavid Hildenbrand * memory within the same group. Remove the effect of all but the 8723fcebf90SDavid Hildenbrand * current group from the stats. 8733fcebf90SDavid Hildenbrand */ 8743fcebf90SDavid Hildenbrand walk_dynamic_memory_groups(nid, auto_movable_stats_account_group, 8753fcebf90SDavid Hildenbrand group, &group_stats); 8763fcebf90SDavid Hildenbrand if (kernel_early_pages <= group_stats.req_kernel_early_pages) 8773fcebf90SDavid Hildenbrand return false; 8783fcebf90SDavid Hildenbrand kernel_early_pages -= group_stats.req_kernel_early_pages; 8793fcebf90SDavid Hildenbrand movable_pages -= group_stats.movable_pages; 8803fcebf90SDavid Hildenbrand 8813fcebf90SDavid Hildenbrand if (group && group->is_dynamic) 8823fcebf90SDavid Hildenbrand kernel_early_pages += group->present_kernel_pages; 8833fcebf90SDavid Hildenbrand 8843fcebf90SDavid Hildenbrand /* 885e83a437fSDavid Hildenbrand * Test if we could online the given number of pages to ZONE_MOVABLE 886e83a437fSDavid Hildenbrand * and still stay in the configured ratio. 887e83a437fSDavid Hildenbrand */ 888e83a437fSDavid Hildenbrand movable_pages += nr_pages; 889e83a437fSDavid Hildenbrand return movable_pages <= (auto_movable_ratio * kernel_early_pages) / 100; 890e83a437fSDavid Hildenbrand } 891e83a437fSDavid Hildenbrand 892f1dd2cd1SMichal Hocko /* 893c246a213SMichal Hocko * Returns a default kernel memory zone for the given pfn range. 894c246a213SMichal Hocko * If no kernel zone covers this pfn range it will automatically go 895c246a213SMichal Hocko * to the ZONE_NORMAL. 896c246a213SMichal Hocko */ 897c6f03e29SMichal Hocko static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn, 898c246a213SMichal Hocko unsigned long nr_pages) 899c246a213SMichal Hocko { 900c246a213SMichal Hocko struct pglist_data *pgdat = NODE_DATA(nid); 901c246a213SMichal Hocko int zid; 902c246a213SMichal Hocko 903d6aad201SMiaohe Lin for (zid = 0; zid < ZONE_NORMAL; zid++) { 904c246a213SMichal Hocko struct zone *zone = &pgdat->node_zones[zid]; 905c246a213SMichal Hocko 906c246a213SMichal Hocko if (zone_intersects(zone, start_pfn, nr_pages)) 907c246a213SMichal Hocko return zone; 908c246a213SMichal Hocko } 909c246a213SMichal Hocko 910c246a213SMichal Hocko return &pgdat->node_zones[ZONE_NORMAL]; 911c246a213SMichal Hocko } 912c246a213SMichal Hocko 913e83a437fSDavid Hildenbrand /* 914e83a437fSDavid Hildenbrand * Determine to which zone to online memory dynamically based on user 915e83a437fSDavid Hildenbrand * configuration and system stats. We care about the following ratio: 916e83a437fSDavid Hildenbrand * 917e83a437fSDavid Hildenbrand * MOVABLE : KERNEL 918e83a437fSDavid Hildenbrand * 919e83a437fSDavid Hildenbrand * Whereby MOVABLE is memory in ZONE_MOVABLE and KERNEL is memory in 920e83a437fSDavid Hildenbrand * one of the kernel zones. CMA pages inside one of the kernel zones really 921e83a437fSDavid Hildenbrand * behaves like ZONE_MOVABLE, so we treat them accordingly. 922e83a437fSDavid Hildenbrand * 923e83a437fSDavid Hildenbrand * We don't allow for hotplugged memory in a KERNEL zone to increase the 924e83a437fSDavid Hildenbrand * amount of MOVABLE memory we can have, so we end up with: 925e83a437fSDavid Hildenbrand * 926e83a437fSDavid Hildenbrand * MOVABLE : KERNEL_EARLY 927e83a437fSDavid Hildenbrand * 928e83a437fSDavid Hildenbrand * Whereby KERNEL_EARLY is memory in one of the kernel zones, available sinze 929e83a437fSDavid Hildenbrand * boot. We base our calculation on KERNEL_EARLY internally, because: 930e83a437fSDavid Hildenbrand * 931e83a437fSDavid Hildenbrand * a) Hotplugged memory in one of the kernel zones can sometimes still get 932e83a437fSDavid Hildenbrand * hotunplugged, especially when hot(un)plugging individual memory blocks. 933e83a437fSDavid Hildenbrand * There is no coordination across memory devices, therefore "automatic" 934e83a437fSDavid Hildenbrand * hotunplugging, as implemented in hypervisors, could result in zone 935e83a437fSDavid Hildenbrand * imbalances. 936e83a437fSDavid Hildenbrand * b) Early/boot memory in one of the kernel zones can usually not get 937e83a437fSDavid Hildenbrand * hotunplugged again (e.g., no firmware interface to unplug, fragmented 938e83a437fSDavid Hildenbrand * with unmovable allocations). While there are corner cases where it might 939e83a437fSDavid Hildenbrand * still work, it is barely relevant in practice. 940e83a437fSDavid Hildenbrand * 9413fcebf90SDavid Hildenbrand * Exceptions are dynamic memory groups, which allow for more MOVABLE 9423fcebf90SDavid Hildenbrand * memory within the same memory group -- because in that case, there is 9433fcebf90SDavid Hildenbrand * coordination within the single memory device managed by a single driver. 9443fcebf90SDavid Hildenbrand * 945e83a437fSDavid Hildenbrand * We rely on "present pages" instead of "managed pages", as the latter is 946e83a437fSDavid Hildenbrand * highly unreliable and dynamic in virtualized environments, and does not 947e83a437fSDavid Hildenbrand * consider boot time allocations. For example, memory ballooning adjusts the 948e83a437fSDavid Hildenbrand * managed pages when inflating/deflating the balloon, and balloon compaction 949e83a437fSDavid Hildenbrand * can even migrate inflated pages between zones. 950e83a437fSDavid Hildenbrand * 951e83a437fSDavid Hildenbrand * Using "present pages" is better but some things to keep in mind are: 952e83a437fSDavid Hildenbrand * 953e83a437fSDavid Hildenbrand * a) Some memblock allocations, such as for the crashkernel area, are 954e83a437fSDavid Hildenbrand * effectively unused by the kernel, yet they account to "present pages". 955e83a437fSDavid Hildenbrand * Fortunately, these allocations are comparatively small in relevant setups 956e83a437fSDavid Hildenbrand * (e.g., fraction of system memory). 957e83a437fSDavid Hildenbrand * b) Some hotplugged memory blocks in virtualized environments, esecially 958e83a437fSDavid Hildenbrand * hotplugged by virtio-mem, look like they are completely present, however, 959e83a437fSDavid Hildenbrand * only parts of the memory block are actually currently usable. 960e83a437fSDavid Hildenbrand * "present pages" is an upper limit that can get reached at runtime. As 961e83a437fSDavid Hildenbrand * we base our calculations on KERNEL_EARLY, this is not an issue. 962e83a437fSDavid Hildenbrand */ 963445fcf7cSDavid Hildenbrand static struct zone *auto_movable_zone_for_pfn(int nid, 964445fcf7cSDavid Hildenbrand struct memory_group *group, 965445fcf7cSDavid Hildenbrand unsigned long pfn, 966e83a437fSDavid Hildenbrand unsigned long nr_pages) 967e83a437fSDavid Hildenbrand { 968445fcf7cSDavid Hildenbrand unsigned long online_pages = 0, max_pages, end_pfn; 969445fcf7cSDavid Hildenbrand struct page *page; 970445fcf7cSDavid Hildenbrand 971e83a437fSDavid Hildenbrand if (!auto_movable_ratio) 972e83a437fSDavid Hildenbrand goto kernel_zone; 973e83a437fSDavid Hildenbrand 974445fcf7cSDavid Hildenbrand if (group && !group->is_dynamic) { 975445fcf7cSDavid Hildenbrand max_pages = group->s.max_pages; 976445fcf7cSDavid Hildenbrand online_pages = group->present_movable_pages; 977445fcf7cSDavid Hildenbrand 978445fcf7cSDavid Hildenbrand /* If anything is !MOVABLE online the rest !MOVABLE. */ 979445fcf7cSDavid Hildenbrand if (group->present_kernel_pages) 980445fcf7cSDavid Hildenbrand goto kernel_zone; 981445fcf7cSDavid Hildenbrand } else if (!group || group->d.unit_pages == nr_pages) { 982445fcf7cSDavid Hildenbrand max_pages = nr_pages; 983445fcf7cSDavid Hildenbrand } else { 984445fcf7cSDavid Hildenbrand max_pages = group->d.unit_pages; 985445fcf7cSDavid Hildenbrand /* 986445fcf7cSDavid Hildenbrand * Take a look at all online sections in the current unit. 987445fcf7cSDavid Hildenbrand * We can safely assume that all pages within a section belong 988445fcf7cSDavid Hildenbrand * to the same zone, because dynamic memory groups only deal 989445fcf7cSDavid Hildenbrand * with hotplugged memory. 990445fcf7cSDavid Hildenbrand */ 991445fcf7cSDavid Hildenbrand pfn = ALIGN_DOWN(pfn, group->d.unit_pages); 992445fcf7cSDavid Hildenbrand end_pfn = pfn + group->d.unit_pages; 993445fcf7cSDavid Hildenbrand for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { 994445fcf7cSDavid Hildenbrand page = pfn_to_online_page(pfn); 995445fcf7cSDavid Hildenbrand if (!page) 996445fcf7cSDavid Hildenbrand continue; 997445fcf7cSDavid Hildenbrand /* If anything is !MOVABLE online the rest !MOVABLE. */ 99807252dfeSKefeng Wang if (!is_zone_movable_page(page)) 999445fcf7cSDavid Hildenbrand goto kernel_zone; 1000445fcf7cSDavid Hildenbrand online_pages += PAGES_PER_SECTION; 1001445fcf7cSDavid Hildenbrand } 1002445fcf7cSDavid Hildenbrand } 1003445fcf7cSDavid Hildenbrand 1004445fcf7cSDavid Hildenbrand /* 1005445fcf7cSDavid Hildenbrand * Online MOVABLE if we could *currently* online all remaining parts 1006445fcf7cSDavid Hildenbrand * MOVABLE. We expect to (add+) online them immediately next, so if 1007445fcf7cSDavid Hildenbrand * nobody interferes, all will be MOVABLE if possible. 1008445fcf7cSDavid Hildenbrand */ 1009445fcf7cSDavid Hildenbrand nr_pages = max_pages - online_pages; 10103fcebf90SDavid Hildenbrand if (!auto_movable_can_online_movable(NUMA_NO_NODE, group, nr_pages)) 1011e83a437fSDavid Hildenbrand goto kernel_zone; 1012e83a437fSDavid Hildenbrand 1013e83a437fSDavid Hildenbrand #ifdef CONFIG_NUMA 1014e83a437fSDavid Hildenbrand if (auto_movable_numa_aware && 10153fcebf90SDavid Hildenbrand !auto_movable_can_online_movable(nid, group, nr_pages)) 1016e83a437fSDavid Hildenbrand goto kernel_zone; 1017e83a437fSDavid Hildenbrand #endif /* CONFIG_NUMA */ 1018e83a437fSDavid Hildenbrand 1019e83a437fSDavid Hildenbrand return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; 1020e83a437fSDavid Hildenbrand kernel_zone: 1021e83a437fSDavid Hildenbrand return default_kernel_zone_for_pfn(nid, pfn, nr_pages); 1022e83a437fSDavid Hildenbrand } 1023e83a437fSDavid Hildenbrand 1024c6f03e29SMichal Hocko static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, 1025c6f03e29SMichal Hocko unsigned long nr_pages) 1026e5e68930SMichal Hocko { 1027c6f03e29SMichal Hocko struct zone *kernel_zone = default_kernel_zone_for_pfn(nid, start_pfn, 1028c6f03e29SMichal Hocko nr_pages); 1029c6f03e29SMichal Hocko struct zone *movable_zone = &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; 1030c6f03e29SMichal Hocko bool in_kernel = zone_intersects(kernel_zone, start_pfn, nr_pages); 1031c6f03e29SMichal Hocko bool in_movable = zone_intersects(movable_zone, start_pfn, nr_pages); 1032e5e68930SMichal Hocko 1033e5e68930SMichal Hocko /* 1034c6f03e29SMichal Hocko * We inherit the existing zone in a simple case where zones do not 1035c6f03e29SMichal Hocko * overlap in the given range 1036e5e68930SMichal Hocko */ 1037c6f03e29SMichal Hocko if (in_kernel ^ in_movable) 1038c6f03e29SMichal Hocko return (in_kernel) ? kernel_zone : movable_zone; 1039e5e68930SMichal Hocko 1040c6f03e29SMichal Hocko /* 1041c6f03e29SMichal Hocko * If the range doesn't belong to any zone or two zones overlap in the 1042c6f03e29SMichal Hocko * given range then we use movable zone only if movable_node is 1043c6f03e29SMichal Hocko * enabled because we always online to a kernel zone by default. 1044c6f03e29SMichal Hocko */ 1045c6f03e29SMichal Hocko return movable_node_enabled ? movable_zone : kernel_zone; 10469f123ab5SMichal Hocko } 10479f123ab5SMichal Hocko 10487cf209baSDavid Hildenbrand struct zone *zone_for_pfn_range(int online_type, int nid, 1049445fcf7cSDavid Hildenbrand struct memory_group *group, unsigned long start_pfn, 1050e5e68930SMichal Hocko unsigned long nr_pages) 1051f1dd2cd1SMichal Hocko { 1052c6f03e29SMichal Hocko if (online_type == MMOP_ONLINE_KERNEL) 1053c6f03e29SMichal Hocko return default_kernel_zone_for_pfn(nid, start_pfn, nr_pages); 1054f1dd2cd1SMichal Hocko 1055c6f03e29SMichal Hocko if (online_type == MMOP_ONLINE_MOVABLE) 1056c6f03e29SMichal Hocko return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; 1057f1dd2cd1SMichal Hocko 1058e83a437fSDavid Hildenbrand if (online_policy == ONLINE_POLICY_AUTO_MOVABLE) 1059445fcf7cSDavid Hildenbrand return auto_movable_zone_for_pfn(nid, group, start_pfn, nr_pages); 1060e83a437fSDavid Hildenbrand 1061c6f03e29SMichal Hocko return default_zone_for_pfn(nid, start_pfn, nr_pages); 1062e5e68930SMichal Hocko } 1063e5e68930SMichal Hocko 1064a08a2ae3SOscar Salvador /* 1065a08a2ae3SOscar Salvador * This function should only be called by memory_block_{online,offline}, 1066a08a2ae3SOscar Salvador * and {online,offline}_pages. 1067a08a2ae3SOscar Salvador */ 1068836809ecSDavid Hildenbrand void adjust_present_page_count(struct page *page, struct memory_group *group, 1069836809ecSDavid Hildenbrand long nr_pages) 1070f9901144SDavid Hildenbrand { 10714b097002SDavid Hildenbrand struct zone *zone = page_zone(page); 1072836809ecSDavid Hildenbrand const bool movable = zone_idx(zone) == ZONE_MOVABLE; 10734b097002SDavid Hildenbrand 10744b097002SDavid Hildenbrand /* 10754b097002SDavid Hildenbrand * We only support onlining/offlining/adding/removing of complete 10764b097002SDavid Hildenbrand * memory blocks; therefore, either all is either early or hotplugged. 10774b097002SDavid Hildenbrand */ 10784b097002SDavid Hildenbrand if (early_section(__pfn_to_section(page_to_pfn(page)))) 10794b097002SDavid Hildenbrand zone->present_early_pages += nr_pages; 1080f9901144SDavid Hildenbrand zone->present_pages += nr_pages; 1081f9901144SDavid Hildenbrand zone->zone_pgdat->node_present_pages += nr_pages; 1082836809ecSDavid Hildenbrand 1083836809ecSDavid Hildenbrand if (group && movable) 1084836809ecSDavid Hildenbrand group->present_movable_pages += nr_pages; 1085836809ecSDavid Hildenbrand else if (group && !movable) 1086836809ecSDavid Hildenbrand group->present_kernel_pages += nr_pages; 1087f9901144SDavid Hildenbrand } 1088f9901144SDavid Hildenbrand 1089a08a2ae3SOscar Salvador int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages, 1090c5f1e2d1SSumanth Korikkar struct zone *zone, bool mhp_off_inaccessible) 1091a08a2ae3SOscar Salvador { 1092a08a2ae3SOscar Salvador unsigned long end_pfn = pfn + nr_pages; 109366361095SMuchun Song int ret, i; 1094a08a2ae3SOscar Salvador 1095a08a2ae3SOscar Salvador ret = kasan_add_zero_shadow(__va(PFN_PHYS(pfn)), PFN_PHYS(nr_pages)); 1096a08a2ae3SOscar Salvador if (ret) 1097a08a2ae3SOscar Salvador return ret; 1098a08a2ae3SOscar Salvador 1099c5f1e2d1SSumanth Korikkar /* 1100c5f1e2d1SSumanth Korikkar * Memory block is accessible at this stage and hence poison the struct 1101c5f1e2d1SSumanth Korikkar * pages now. If the memory block is accessible during memory hotplug 1102c5f1e2d1SSumanth Korikkar * addition phase, then page poisining is already performed in 1103c5f1e2d1SSumanth Korikkar * sparse_add_section(). 1104c5f1e2d1SSumanth Korikkar */ 1105c5f1e2d1SSumanth Korikkar if (mhp_off_inaccessible) 1106c5f1e2d1SSumanth Korikkar page_init_poison(pfn_to_page(pfn), sizeof(struct page) * nr_pages); 1107c5f1e2d1SSumanth Korikkar 1108a08a2ae3SOscar Salvador move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_UNMOVABLE); 1109a08a2ae3SOscar Salvador 111066361095SMuchun Song for (i = 0; i < nr_pages; i++) 111166361095SMuchun Song SetPageVmemmapSelfHosted(pfn_to_page(pfn + i)); 111266361095SMuchun Song 1113a08a2ae3SOscar Salvador /* 1114a08a2ae3SOscar Salvador * It might be that the vmemmap_pages fully span sections. If that is 1115a08a2ae3SOscar Salvador * the case, mark those sections online here as otherwise they will be 1116a08a2ae3SOscar Salvador * left offline. 1117a08a2ae3SOscar Salvador */ 1118a08a2ae3SOscar Salvador if (nr_pages >= PAGES_PER_SECTION) 1119a08a2ae3SOscar Salvador online_mem_sections(pfn, ALIGN_DOWN(end_pfn, PAGES_PER_SECTION)); 1120a08a2ae3SOscar Salvador 1121a08a2ae3SOscar Salvador return ret; 1122a08a2ae3SOscar Salvador } 1123a08a2ae3SOscar Salvador 1124a08a2ae3SOscar Salvador void mhp_deinit_memmap_on_memory(unsigned long pfn, unsigned long nr_pages) 1125a08a2ae3SOscar Salvador { 1126a08a2ae3SOscar Salvador unsigned long end_pfn = pfn + nr_pages; 1127a08a2ae3SOscar Salvador 1128a08a2ae3SOscar Salvador /* 1129a08a2ae3SOscar Salvador * It might be that the vmemmap_pages fully span sections. If that is 1130a08a2ae3SOscar Salvador * the case, mark those sections offline here as otherwise they will be 1131a08a2ae3SOscar Salvador * left online. 1132a08a2ae3SOscar Salvador */ 1133a08a2ae3SOscar Salvador if (nr_pages >= PAGES_PER_SECTION) 1134a08a2ae3SOscar Salvador offline_mem_sections(pfn, ALIGN_DOWN(end_pfn, PAGES_PER_SECTION)); 1135a08a2ae3SOscar Salvador 1136a08a2ae3SOscar Salvador /* 1137a08a2ae3SOscar Salvador * The pages associated with this vmemmap have been offlined, so 1138a08a2ae3SOscar Salvador * we can reset its state here. 1139a08a2ae3SOscar Salvador */ 1140a08a2ae3SOscar Salvador remove_pfn_range_from_zone(page_zone(pfn_to_page(pfn)), pfn, nr_pages); 1141a08a2ae3SOscar Salvador kasan_remove_zero_shadow(__va(PFN_PHYS(pfn)), PFN_PHYS(nr_pages)); 1142a08a2ae3SOscar Salvador } 1143a08a2ae3SOscar Salvador 1144001002e7SSumanth Korikkar /* 1145001002e7SSumanth Korikkar * Must be called with mem_hotplug_lock in write mode. 1146001002e7SSumanth Korikkar */ 1147836809ecSDavid Hildenbrand int __ref online_pages(unsigned long pfn, unsigned long nr_pages, 1148836809ecSDavid Hildenbrand struct zone *zone, struct memory_group *group) 114975884fb1SKAMEZAWA Hiroyuki { 1150aa47228aSCody P Schafer unsigned long flags; 11516811378eSYasunori Goto int need_zonelists_rebuild = 0; 1152a08a2ae3SOscar Salvador const int nid = zone_to_nid(zone); 11537b78d335SYasunori Goto int ret; 11547b78d335SYasunori Goto struct memory_notify arg; 11553947be19SDave Hansen 1156dd8e2f23SOscar Salvador /* 1157dd8e2f23SOscar Salvador * {on,off}lining is constrained to full memory sections (or more 1158041711ceSZhen Lei * precisely to memory blocks from the user space POV). 1159dd8e2f23SOscar Salvador * memmap_on_memory is an exception because it reserves initial part 1160dd8e2f23SOscar Salvador * of the physical memory space for vmemmaps. That space is pageblock 1161dd8e2f23SOscar Salvador * aligned. 1162dd8e2f23SOscar Salvador */ 1163ee0913c4SKefeng Wang if (WARN_ON_ONCE(!nr_pages || !pageblock_aligned(pfn) || 1164dd8e2f23SOscar Salvador !IS_ALIGNED(pfn + nr_pages, PAGES_PER_SECTION))) 11654986fac1SDavid Hildenbrand return -EINVAL; 11664986fac1SDavid Hildenbrand 1167381eab4aSDavid Hildenbrand 1168f1dd2cd1SMichal Hocko /* associate pfn range with the zone */ 1169b30c5927SDavid Hildenbrand move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_ISOLATE); 1170511c2abaSLai Jiangshan 11717b78d335SYasunori Goto arg.start_pfn = pfn; 11727b78d335SYasunori Goto arg.nr_pages = nr_pages; 1173d9713679SLai Jiangshan node_states_check_changes_online(nr_pages, zone, &arg); 11747b78d335SYasunori Goto 11757b78d335SYasunori Goto ret = memory_notify(MEM_GOING_ONLINE, &arg); 11767b78d335SYasunori Goto ret = notifier_to_errno(ret); 1177e33e33b4SChen Yucong if (ret) 1178e33e33b4SChen Yucong goto failed_addition; 1179e33e33b4SChen Yucong 11803947be19SDave Hansen /* 1181b30c5927SDavid Hildenbrand * Fixup the number of isolated pageblocks before marking the sections 1182b30c5927SDavid Hildenbrand * onlining, such that undo_isolate_page_range() works correctly. 1183b30c5927SDavid Hildenbrand */ 1184b30c5927SDavid Hildenbrand spin_lock_irqsave(&zone->lock, flags); 1185b30c5927SDavid Hildenbrand zone->nr_isolate_pageblock += nr_pages / pageblock_nr_pages; 1186b30c5927SDavid Hildenbrand spin_unlock_irqrestore(&zone->lock, flags); 1187b30c5927SDavid Hildenbrand 1188b30c5927SDavid Hildenbrand /* 11896811378eSYasunori Goto * If this zone is not populated, then it is not in zonelist. 11906811378eSYasunori Goto * This means the page allocator ignores this zone. 11916811378eSYasunori Goto * So, zonelist must be updated after online. 11926811378eSYasunori Goto */ 11936dcd73d7SWen Congyang if (!populated_zone(zone)) { 11946811378eSYasunori Goto need_zonelists_rebuild = 1; 119572675e13SMichal Hocko setup_zone_pageset(zone); 11966dcd73d7SWen Congyang } 11976811378eSYasunori Goto 1198aac65321SDavid Hildenbrand online_pages_range(pfn, nr_pages); 1199836809ecSDavid Hildenbrand adjust_present_page_count(pfn_to_page(pfn), group, nr_pages); 1200aa47228aSCody P Schafer 1201b30c5927SDavid Hildenbrand node_states_set_node(nid, &arg); 1202b30c5927SDavid Hildenbrand if (need_zonelists_rebuild) 1203b30c5927SDavid Hildenbrand build_all_zonelists(NULL); 1204b30c5927SDavid Hildenbrand 1205b30c5927SDavid Hildenbrand /* Basic onlining is complete, allow allocation of onlined pages. */ 1206b30c5927SDavid Hildenbrand undo_isolate_page_range(pfn, pfn + nr_pages, MIGRATE_MOVABLE); 1207b30c5927SDavid Hildenbrand 120893146d98SDavid Hildenbrand /* 1209b86c5fc4SDavid Hildenbrand * Freshly onlined pages aren't shuffled (e.g., all pages are placed to 1210b86c5fc4SDavid Hildenbrand * the tail of the freelist when undoing isolation). Shuffle the whole 1211b86c5fc4SDavid Hildenbrand * zone to make sure the just onlined pages are properly distributed 1212b86c5fc4SDavid Hildenbrand * across the whole freelist - to create an initial shuffle. 121393146d98SDavid Hildenbrand */ 1214e900a918SDan Williams shuffle_zone(zone); 1215e900a918SDan Williams 1216b92ca18eSMel Gorman /* reinitialise watermarks and update pcp limits */ 12171b79acc9SKOSAKI Motohiro init_per_zone_wmark_min(); 12181b79acc9SKOSAKI Motohiro 1219e888ca35SVlastimil Babka kswapd_run(nid); 1220698b1b30SVlastimil Babka kcompactd_run(nid); 122161b13993SDave Hansen 12222d1d43f6SChandra Seetharaman writeback_set_ratelimit(); 12237b78d335SYasunori Goto 12247b78d335SYasunori Goto memory_notify(MEM_ONLINE, &arg); 122530467e0bSDavid Rientjes return 0; 1226e33e33b4SChen Yucong 1227e33e33b4SChen Yucong failed_addition: 1228e33e33b4SChen Yucong pr_debug("online_pages [mem %#010llx-%#010llx] failed\n", 1229e33e33b4SChen Yucong (unsigned long long) pfn << PAGE_SHIFT, 1230e33e33b4SChen Yucong (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1); 1231e33e33b4SChen Yucong memory_notify(MEM_CANCEL_ONLINE, &arg); 1232feee6b29SDavid Hildenbrand remove_pfn_range_from_zone(zone, pfn, nr_pages); 1233e33e33b4SChen Yucong return ret; 12343947be19SDave Hansen } 1235bc02af93SYasunori Goto 1236e1319331SHidetoshi Seto /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ 123709f49dcaSMichal Hocko static pg_data_t __ref *hotadd_init_pgdat(int nid) 12389af3c2deSYasunori Goto { 12399af3c2deSYasunori Goto struct pglist_data *pgdat; 12409af3c2deSYasunori Goto 124109f49dcaSMichal Hocko /* 124209f49dcaSMichal Hocko * NODE_DATA is preallocated (free_area_init) but its internal 124309f49dcaSMichal Hocko * state is not allocated completely. Add missing pieces. 124409f49dcaSMichal Hocko * Completely offline nodes stay around and they just need 124509f49dcaSMichal Hocko * reintialization. 124609f49dcaSMichal Hocko */ 124770b5b46aSMichal Hocko pgdat = NODE_DATA(nid); 124803e85f9dSOscar Salvador 12499af3c2deSYasunori Goto /* init node's zones as empty zones, we don't have any present pages.*/ 125070b5b46aSMichal Hocko free_area_init_core_hotplug(pgdat); 12519af3c2deSYasunori Goto 1252959ecc48SKAMEZAWA Hiroyuki /* 1253959ecc48SKAMEZAWA Hiroyuki * The node we allocated has no zone fallback lists. For avoiding 1254959ecc48SKAMEZAWA Hiroyuki * to access not-initialized zonelist, build here. 1255959ecc48SKAMEZAWA Hiroyuki */ 125672675e13SMichal Hocko build_all_zonelists(pgdat); 1257959ecc48SKAMEZAWA Hiroyuki 12589af3c2deSYasunori Goto return pgdat; 12599af3c2deSYasunori Goto } 12609af3c2deSYasunori Goto 1261ba2d2666SMel Gorman /* 1262ba2d2666SMel Gorman * __try_online_node - online a node if offlined 1263e8b098fcSMike Rapoport * @nid: the node ID 1264b9ff0360SOscar Salvador * @set_node_online: Whether we want to online the node 1265cf23422bSminskey guo * called by cpu_up() to online a node without onlined memory. 1266b9ff0360SOscar Salvador * 1267b9ff0360SOscar Salvador * Returns: 1268b9ff0360SOscar Salvador * 1 -> a new node has been allocated 1269b9ff0360SOscar Salvador * 0 -> the node is already online 1270b9ff0360SOscar Salvador * -ENOMEM -> the node could not be allocated 1271cf23422bSminskey guo */ 1272c68ab18cSDavid Hildenbrand static int __try_online_node(int nid, bool set_node_online) 1273cf23422bSminskey guo { 1274cf23422bSminskey guo pg_data_t *pgdat; 1275b9ff0360SOscar Salvador int ret = 1; 1276cf23422bSminskey guo 127701b0f197SToshi Kani if (node_online(nid)) 127801b0f197SToshi Kani return 0; 127901b0f197SToshi Kani 128009f49dcaSMichal Hocko pgdat = hotadd_init_pgdat(nid); 12817553e8f2SDavid Rientjes if (!pgdat) { 128201b0f197SToshi Kani pr_err("Cannot online node %d due to NULL pgdat\n", nid); 1283cf23422bSminskey guo ret = -ENOMEM; 1284cf23422bSminskey guo goto out; 1285cf23422bSminskey guo } 1286b9ff0360SOscar Salvador 1287b9ff0360SOscar Salvador if (set_node_online) { 1288cf23422bSminskey guo node_set_online(nid); 1289cf23422bSminskey guo ret = register_one_node(nid); 1290cf23422bSminskey guo BUG_ON(ret); 1291b9ff0360SOscar Salvador } 1292cf23422bSminskey guo out: 1293b9ff0360SOscar Salvador return ret; 1294b9ff0360SOscar Salvador } 1295b9ff0360SOscar Salvador 1296b9ff0360SOscar Salvador /* 1297b9ff0360SOscar Salvador * Users of this function always want to online/register the node 1298b9ff0360SOscar Salvador */ 1299b9ff0360SOscar Salvador int try_online_node(int nid) 1300b9ff0360SOscar Salvador { 1301b9ff0360SOscar Salvador int ret; 1302b9ff0360SOscar Salvador 1303b9ff0360SOscar Salvador mem_hotplug_begin(); 1304c68ab18cSDavid Hildenbrand ret = __try_online_node(nid, true); 1305bfc8c901SVladimir Davydov mem_hotplug_done(); 1306cf23422bSminskey guo return ret; 1307cf23422bSminskey guo } 1308cf23422bSminskey guo 130927356f54SToshi Kani static int check_hotplug_memory_range(u64 start, u64 size) 131027356f54SToshi Kani { 1311ba325585SPavel Tatashin /* memory range must be block size aligned */ 1312cec3ebd0SDavid Hildenbrand if (!size || !IS_ALIGNED(start, memory_block_size_bytes()) || 1313cec3ebd0SDavid Hildenbrand !IS_ALIGNED(size, memory_block_size_bytes())) { 1314ba325585SPavel Tatashin pr_err("Block size [%#lx] unaligned hotplug range: start %#llx, size %#llx", 1315cec3ebd0SDavid Hildenbrand memory_block_size_bytes(), start, size); 131627356f54SToshi Kani return -EINVAL; 131727356f54SToshi Kani } 131827356f54SToshi Kani 131927356f54SToshi Kani return 0; 132027356f54SToshi Kani } 132127356f54SToshi Kani 132231bc3858SVitaly Kuznetsov static int online_memory_block(struct memory_block *mem, void *arg) 132331bc3858SVitaly Kuznetsov { 13241adf8b46SAnshuman Khandual mem->online_type = mhp_default_online_type; 1325dc18d706SNathan Fontenot return device_online(&mem->dev); 132631bc3858SVitaly Kuznetsov } 132731bc3858SVitaly Kuznetsov 132885a2b4b0SAneesh Kumar K.V #ifndef arch_supports_memmap_on_memory 132985a2b4b0SAneesh Kumar K.V static inline bool arch_supports_memmap_on_memory(unsigned long vmemmap_size) 133085a2b4b0SAneesh Kumar K.V { 133185a2b4b0SAneesh Kumar K.V /* 133285a2b4b0SAneesh Kumar K.V * As default, we want the vmemmap to span a complete PMD such that we 133385a2b4b0SAneesh Kumar K.V * can map the vmemmap using a single PMD if supported by the 133485a2b4b0SAneesh Kumar K.V * architecture. 133585a2b4b0SAneesh Kumar K.V */ 133685a2b4b0SAneesh Kumar K.V return IS_ALIGNED(vmemmap_size, PMD_SIZE); 133785a2b4b0SAneesh Kumar K.V } 133885a2b4b0SAneesh Kumar K.V #endif 133985a2b4b0SAneesh Kumar K.V 1340*42d93582SVishal Verma bool mhp_supports_memmap_on_memory(void) 1341a08a2ae3SOscar Salvador { 134285a2b4b0SAneesh Kumar K.V unsigned long vmemmap_size = memory_block_memmap_size(); 13432d1f649cSAneesh Kumar K.V unsigned long memmap_pages = memory_block_memmap_on_memory_pages(); 1344a08a2ae3SOscar Salvador 1345a08a2ae3SOscar Salvador /* 1346a08a2ae3SOscar Salvador * Besides having arch support and the feature enabled at runtime, we 1347a08a2ae3SOscar Salvador * need a few more assumptions to hold true: 1348a08a2ae3SOscar Salvador * 1349*42d93582SVishal Verma * a) The vmemmap pages span complete PMDs: We don't want vmemmap code 1350a08a2ae3SOscar Salvador * to populate memory from the altmap for unrelated parts (i.e., 1351a08a2ae3SOscar Salvador * other memory blocks) 1352a08a2ae3SOscar Salvador * 1353*42d93582SVishal Verma * b) The vmemmap pages (and thereby the pages that will be exposed to 1354a08a2ae3SOscar Salvador * the buddy) have to cover full pageblocks: memory onlining/offlining 1355a08a2ae3SOscar Salvador * code requires applicable ranges to be page-aligned, for example, to 1356a08a2ae3SOscar Salvador * set the migratetypes properly. 1357a08a2ae3SOscar Salvador * 1358a08a2ae3SOscar Salvador * TODO: Although we have a check here to make sure that vmemmap pages 1359a08a2ae3SOscar Salvador * fully populate a PMD, it is not the right place to check for 1360a08a2ae3SOscar Salvador * this. A much better solution involves improving vmemmap code 1361a08a2ae3SOscar Salvador * to fallback to base pages when trying to populate vmemmap using 1362a08a2ae3SOscar Salvador * altmap as an alternative source of memory, and we do not exactly 1363a08a2ae3SOscar Salvador * populate a single PMD. 1364a08a2ae3SOscar Salvador */ 1365*42d93582SVishal Verma if (!mhp_memmap_on_memory()) 13662d1f649cSAneesh Kumar K.V return false; 13672d1f649cSAneesh Kumar K.V 13682d1f649cSAneesh Kumar K.V /* 13692d1f649cSAneesh Kumar K.V * Make sure the vmemmap allocation is fully contained 13702d1f649cSAneesh Kumar K.V * so that we always allocate vmemmap memory from altmap area. 13712d1f649cSAneesh Kumar K.V */ 13722d1f649cSAneesh Kumar K.V if (!IS_ALIGNED(vmemmap_size, PAGE_SIZE)) 13732d1f649cSAneesh Kumar K.V return false; 13742d1f649cSAneesh Kumar K.V 13752d1f649cSAneesh Kumar K.V /* 13762d1f649cSAneesh Kumar K.V * start pfn should be pageblock_nr_pages aligned for correctly 13772d1f649cSAneesh Kumar K.V * setting migrate types 13782d1f649cSAneesh Kumar K.V */ 13792d1f649cSAneesh Kumar K.V if (!pageblock_aligned(memmap_pages)) 13802d1f649cSAneesh Kumar K.V return false; 13812d1f649cSAneesh Kumar K.V 13822d1f649cSAneesh Kumar K.V if (memmap_pages == PHYS_PFN(memory_block_size_bytes())) 13832d1f649cSAneesh Kumar K.V /* No effective hotplugged memory doesn't make sense. */ 13842d1f649cSAneesh Kumar K.V return false; 13852d1f649cSAneesh Kumar K.V 13862d1f649cSAneesh Kumar K.V return arch_supports_memmap_on_memory(vmemmap_size); 1387a08a2ae3SOscar Salvador } 1388*42d93582SVishal Verma EXPORT_SYMBOL_GPL(mhp_supports_memmap_on_memory); 1389a08a2ae3SOscar Salvador 13906b8f0798SVishal Verma static void __ref remove_memory_blocks_and_altmaps(u64 start, u64 size) 13916b8f0798SVishal Verma { 13926b8f0798SVishal Verma unsigned long memblock_size = memory_block_size_bytes(); 13936b8f0798SVishal Verma u64 cur_start; 13946b8f0798SVishal Verma 13956b8f0798SVishal Verma /* 13966b8f0798SVishal Verma * For memmap_on_memory, the altmaps were added on a per-memblock 13976b8f0798SVishal Verma * basis; we have to process each individual memory block. 13986b8f0798SVishal Verma */ 13996b8f0798SVishal Verma for (cur_start = start; cur_start < start + size; 14006b8f0798SVishal Verma cur_start += memblock_size) { 14016b8f0798SVishal Verma struct vmem_altmap *altmap = NULL; 14026b8f0798SVishal Verma struct memory_block *mem; 14036b8f0798SVishal Verma 14046b8f0798SVishal Verma mem = find_memory_block(pfn_to_section_nr(PFN_DOWN(cur_start))); 14056b8f0798SVishal Verma if (WARN_ON_ONCE(!mem)) 14066b8f0798SVishal Verma continue; 14076b8f0798SVishal Verma 14086b8f0798SVishal Verma altmap = mem->altmap; 14096b8f0798SVishal Verma mem->altmap = NULL; 14106b8f0798SVishal Verma 14116b8f0798SVishal Verma remove_memory_block_devices(cur_start, memblock_size); 14126b8f0798SVishal Verma 14136b8f0798SVishal Verma arch_remove_memory(cur_start, memblock_size, altmap); 14146b8f0798SVishal Verma 14156b8f0798SVishal Verma /* Verify that all vmemmap pages have actually been freed. */ 14166b8f0798SVishal Verma WARN(altmap->alloc, "Altmap not fully unmapped"); 14176b8f0798SVishal Verma kfree(altmap); 14186b8f0798SVishal Verma } 14196b8f0798SVishal Verma } 14206b8f0798SVishal Verma 14216b8f0798SVishal Verma static int create_altmaps_and_memory_blocks(int nid, struct memory_group *group, 1422c5f1e2d1SSumanth Korikkar u64 start, u64 size, mhp_t mhp_flags) 14236b8f0798SVishal Verma { 14246b8f0798SVishal Verma unsigned long memblock_size = memory_block_size_bytes(); 14256b8f0798SVishal Verma u64 cur_start; 14266b8f0798SVishal Verma int ret; 14276b8f0798SVishal Verma 14286b8f0798SVishal Verma for (cur_start = start; cur_start < start + size; 14296b8f0798SVishal Verma cur_start += memblock_size) { 14306b8f0798SVishal Verma struct mhp_params params = { .pgprot = 14316b8f0798SVishal Verma pgprot_mhp(PAGE_KERNEL) }; 14326b8f0798SVishal Verma struct vmem_altmap mhp_altmap = { 14336b8f0798SVishal Verma .base_pfn = PHYS_PFN(cur_start), 14346b8f0798SVishal Verma .end_pfn = PHYS_PFN(cur_start + memblock_size - 1), 14356b8f0798SVishal Verma }; 14366b8f0798SVishal Verma 14376b8f0798SVishal Verma mhp_altmap.free = memory_block_memmap_on_memory_pages(); 1438c5f1e2d1SSumanth Korikkar if (mhp_flags & MHP_OFFLINE_INACCESSIBLE) 1439c5f1e2d1SSumanth Korikkar mhp_altmap.inaccessible = true; 14406b8f0798SVishal Verma params.altmap = kmemdup(&mhp_altmap, sizeof(struct vmem_altmap), 14416b8f0798SVishal Verma GFP_KERNEL); 14426b8f0798SVishal Verma if (!params.altmap) { 14436b8f0798SVishal Verma ret = -ENOMEM; 14446b8f0798SVishal Verma goto out; 14456b8f0798SVishal Verma } 14466b8f0798SVishal Verma 14476b8f0798SVishal Verma /* call arch's memory hotadd */ 14486b8f0798SVishal Verma ret = arch_add_memory(nid, cur_start, memblock_size, ¶ms); 14496b8f0798SVishal Verma if (ret < 0) { 14506b8f0798SVishal Verma kfree(params.altmap); 14516b8f0798SVishal Verma goto out; 14526b8f0798SVishal Verma } 14536b8f0798SVishal Verma 14546b8f0798SVishal Verma /* create memory block devices after memory was added */ 14556b8f0798SVishal Verma ret = create_memory_block_devices(cur_start, memblock_size, 14566b8f0798SVishal Verma params.altmap, group); 14576b8f0798SVishal Verma if (ret) { 14586b8f0798SVishal Verma arch_remove_memory(cur_start, memblock_size, NULL); 14596b8f0798SVishal Verma kfree(params.altmap); 14606b8f0798SVishal Verma goto out; 14616b8f0798SVishal Verma } 14626b8f0798SVishal Verma } 14636b8f0798SVishal Verma 14646b8f0798SVishal Verma return 0; 14656b8f0798SVishal Verma out: 14666b8f0798SVishal Verma if (ret && cur_start != start) 14676b8f0798SVishal Verma remove_memory_blocks_and_altmaps(start, cur_start - start); 14686b8f0798SVishal Verma return ret; 14696b8f0798SVishal Verma } 14706b8f0798SVishal Verma 14718df1d0e4SDavid Hildenbrand /* 14728df1d0e4SDavid Hildenbrand * NOTE: The caller must call lock_device_hotplug() to serialize hotplug 14738df1d0e4SDavid Hildenbrand * and online/offline operations (triggered e.g. by sysfs). 14748df1d0e4SDavid Hildenbrand * 14758df1d0e4SDavid Hildenbrand * we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG 14768df1d0e4SDavid Hildenbrand */ 1477b6117199SDavid Hildenbrand int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags) 1478bc02af93SYasunori Goto { 1479d15dfd31SCatalin Marinas struct mhp_params params = { .pgprot = pgprot_mhp(PAGE_KERNEL) }; 148032befe9eSDavid Hildenbrand enum memblock_flags memblock_flags = MEMBLOCK_NONE; 1481028fc57aSDavid Hildenbrand struct memory_group *group = NULL; 148262cedb9fSDavid Vrabel u64 start, size; 1483b9ff0360SOscar Salvador bool new_node = false; 1484bc02af93SYasunori Goto int ret; 1485bc02af93SYasunori Goto 148662cedb9fSDavid Vrabel start = res->start; 148762cedb9fSDavid Vrabel size = resource_size(res); 148862cedb9fSDavid Vrabel 148927356f54SToshi Kani ret = check_hotplug_memory_range(start, size); 149027356f54SToshi Kani if (ret) 149127356f54SToshi Kani return ret; 149227356f54SToshi Kani 1493028fc57aSDavid Hildenbrand if (mhp_flags & MHP_NID_IS_MGID) { 1494028fc57aSDavid Hildenbrand group = memory_group_find_by_id(nid); 1495028fc57aSDavid Hildenbrand if (!group) 1496028fc57aSDavid Hildenbrand return -EINVAL; 1497028fc57aSDavid Hildenbrand nid = group->nid; 1498028fc57aSDavid Hildenbrand } 1499028fc57aSDavid Hildenbrand 1500fa6d9ec7SVishal Verma if (!node_possible(nid)) { 1501fa6d9ec7SVishal Verma WARN(1, "node %d was absent from the node_possible_map\n", nid); 1502fa6d9ec7SVishal Verma return -EINVAL; 1503fa6d9ec7SVishal Verma } 1504fa6d9ec7SVishal Verma 1505bfc8c901SVladimir Davydov mem_hotplug_begin(); 1506ac13c462SNathan Zimmer 150753d38316SDavid Hildenbrand if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) { 150832befe9eSDavid Hildenbrand if (res->flags & IORESOURCE_SYSRAM_DRIVER_MANAGED) 150932befe9eSDavid Hildenbrand memblock_flags = MEMBLOCK_DRIVER_MANAGED; 151032befe9eSDavid Hildenbrand ret = memblock_add_node(start, size, nid, memblock_flags); 151153d38316SDavid Hildenbrand if (ret) 151253d38316SDavid Hildenbrand goto error_mem_hotplug_end; 151353d38316SDavid Hildenbrand } 15147f36e3e5STang Chen 1515c68ab18cSDavid Hildenbrand ret = __try_online_node(nid, false); 1516b9ff0360SOscar Salvador if (ret < 0) 151741b9e2d7SWen Congyang goto error; 1518b9ff0360SOscar Salvador new_node = ret; 15199af3c2deSYasunori Goto 1520a08a2ae3SOscar Salvador /* 1521a08a2ae3SOscar Salvador * Self hosted memmap array 1522a08a2ae3SOscar Salvador */ 15236b8f0798SVishal Verma if ((mhp_flags & MHP_MEMMAP_ON_MEMORY) && 1524*42d93582SVishal Verma mhp_supports_memmap_on_memory()) { 1525c5f1e2d1SSumanth Korikkar ret = create_altmaps_and_memory_blocks(nid, group, start, size, mhp_flags); 15266b8f0798SVishal Verma if (ret) 15271a8c64e1SAneesh Kumar K.V goto error; 15286b8f0798SVishal Verma } else { 1529f5637d3bSLogan Gunthorpe ret = arch_add_memory(nid, start, size, ¶ms); 15309af3c2deSYasunori Goto if (ret < 0) 15316b8f0798SVishal Verma goto error; 15329af3c2deSYasunori Goto 1533db051a0dSDavid Hildenbrand /* create memory block devices after memory was added */ 15346b8f0798SVishal Verma ret = create_memory_block_devices(start, size, NULL, group); 1535db051a0dSDavid Hildenbrand if (ret) { 1536f42ce5f0SSumanth Korikkar arch_remove_memory(start, size, params.altmap); 15376b8f0798SVishal Verma goto error; 15386b8f0798SVishal Verma } 1539db051a0dSDavid Hildenbrand } 1540db051a0dSDavid Hildenbrand 1541a1e565aaSTang Chen if (new_node) { 1542d5b6f6a3SOscar Salvador /* If sysfs file of new node can't be created, cpu on the node 15430fc44159SYasunori Goto * can't be hot-added. There is no rollback way now. 15440fc44159SYasunori Goto * So, check by BUG_ON() to catch it reluctantly.. 1545d5b6f6a3SOscar Salvador * We online node here. We can't roll back from here. 15460fc44159SYasunori Goto */ 1547d5b6f6a3SOscar Salvador node_set_online(nid); 1548d5b6f6a3SOscar Salvador ret = __register_one_node(nid); 15490fc44159SYasunori Goto BUG_ON(ret); 15500fc44159SYasunori Goto } 15510fc44159SYasunori Goto 1552cc651559SDavid Hildenbrand register_memory_blocks_under_node(nid, PFN_DOWN(start), 1553cc651559SDavid Hildenbrand PFN_UP(start + size - 1), 1554f85086f9SLaurent Dufour MEMINIT_HOTPLUG); 1555d5b6f6a3SOscar Salvador 1556d96ae530Sakpm@linux-foundation.org /* create new memmap entry */ 15577b7b2721SDavid Hildenbrand if (!strcmp(res->name, "System RAM")) 1558d96ae530Sakpm@linux-foundation.org firmware_map_add_hotplug(start, start + size, "System RAM"); 1559d96ae530Sakpm@linux-foundation.org 1560381eab4aSDavid Hildenbrand /* device_online() will take the lock when calling online_pages() */ 1561381eab4aSDavid Hildenbrand mem_hotplug_done(); 1562381eab4aSDavid Hildenbrand 15639ca6551eSDavid Hildenbrand /* 15649ca6551eSDavid Hildenbrand * In case we're allowed to merge the resource, flag it and trigger 15659ca6551eSDavid Hildenbrand * merging now that adding succeeded. 15669ca6551eSDavid Hildenbrand */ 156726011267SDavid Hildenbrand if (mhp_flags & MHP_MERGE_RESOURCE) 15689ca6551eSDavid Hildenbrand merge_system_ram_resource(res); 15699ca6551eSDavid Hildenbrand 157031bc3858SVitaly Kuznetsov /* online pages if requested */ 15711adf8b46SAnshuman Khandual if (mhp_default_online_type != MMOP_OFFLINE) 1572fbcf73ceSDavid Hildenbrand walk_memory_blocks(start, size, NULL, online_memory_block); 157331bc3858SVitaly Kuznetsov 1574381eab4aSDavid Hildenbrand return ret; 15759af3c2deSYasunori Goto error: 157652219aeaSDavid Hildenbrand if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) 15777f36e3e5STang Chen memblock_remove(start, size); 157853d38316SDavid Hildenbrand error_mem_hotplug_end: 1579bfc8c901SVladimir Davydov mem_hotplug_done(); 1580bc02af93SYasunori Goto return ret; 1581bc02af93SYasunori Goto } 158262cedb9fSDavid Vrabel 15838df1d0e4SDavid Hildenbrand /* requires device_hotplug_lock, see add_memory_resource() */ 1584b6117199SDavid Hildenbrand int __ref __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags) 158562cedb9fSDavid Vrabel { 158662cedb9fSDavid Vrabel struct resource *res; 158762cedb9fSDavid Vrabel int ret; 158862cedb9fSDavid Vrabel 15897b7b2721SDavid Hildenbrand res = register_memory_resource(start, size, "System RAM"); 15906f754ba4SVitaly Kuznetsov if (IS_ERR(res)) 15916f754ba4SVitaly Kuznetsov return PTR_ERR(res); 159262cedb9fSDavid Vrabel 1593b6117199SDavid Hildenbrand ret = add_memory_resource(nid, res, mhp_flags); 159462cedb9fSDavid Vrabel if (ret < 0) 159562cedb9fSDavid Vrabel release_memory_resource(res); 159662cedb9fSDavid Vrabel return ret; 159762cedb9fSDavid Vrabel } 15988df1d0e4SDavid Hildenbrand 1599b6117199SDavid Hildenbrand int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags) 16008df1d0e4SDavid Hildenbrand { 16018df1d0e4SDavid Hildenbrand int rc; 16028df1d0e4SDavid Hildenbrand 16038df1d0e4SDavid Hildenbrand lock_device_hotplug(); 1604b6117199SDavid Hildenbrand rc = __add_memory(nid, start, size, mhp_flags); 16058df1d0e4SDavid Hildenbrand unlock_device_hotplug(); 16068df1d0e4SDavid Hildenbrand 16078df1d0e4SDavid Hildenbrand return rc; 16088df1d0e4SDavid Hildenbrand } 1609bc02af93SYasunori Goto EXPORT_SYMBOL_GPL(add_memory); 16100c0e6195SKAMEZAWA Hiroyuki 16117b7b2721SDavid Hildenbrand /* 16127b7b2721SDavid Hildenbrand * Add special, driver-managed memory to the system as system RAM. Such 16137b7b2721SDavid Hildenbrand * memory is not exposed via the raw firmware-provided memmap as system 16147b7b2721SDavid Hildenbrand * RAM, instead, it is detected and added by a driver - during cold boot, 16157b7b2721SDavid Hildenbrand * after a reboot, and after kexec. 16167b7b2721SDavid Hildenbrand * 16177b7b2721SDavid Hildenbrand * Reasons why this memory should not be used for the initial memmap of a 16187b7b2721SDavid Hildenbrand * kexec kernel or for placing kexec images: 16197b7b2721SDavid Hildenbrand * - The booting kernel is in charge of determining how this memory will be 16207b7b2721SDavid Hildenbrand * used (e.g., use persistent memory as system RAM) 16217b7b2721SDavid Hildenbrand * - Coordination with a hypervisor is required before this memory 16227b7b2721SDavid Hildenbrand * can be used (e.g., inaccessible parts). 16237b7b2721SDavid Hildenbrand * 16247b7b2721SDavid Hildenbrand * For this memory, no entries in /sys/firmware/memmap ("raw firmware-provided 16257b7b2721SDavid Hildenbrand * memory map") are created. Also, the created memory resource is flagged 16267cf603d1SDavid Hildenbrand * with IORESOURCE_SYSRAM_DRIVER_MANAGED, so in-kernel users can special-case 16277b7b2721SDavid Hildenbrand * this memory as well (esp., not place kexec images onto it). 16287b7b2721SDavid Hildenbrand * 16297b7b2721SDavid Hildenbrand * The resource_name (visible via /proc/iomem) has to have the format 16307b7b2721SDavid Hildenbrand * "System RAM ($DRIVER)". 16317b7b2721SDavid Hildenbrand */ 16327b7b2721SDavid Hildenbrand int add_memory_driver_managed(int nid, u64 start, u64 size, 1633b6117199SDavid Hildenbrand const char *resource_name, mhp_t mhp_flags) 16347b7b2721SDavid Hildenbrand { 16357b7b2721SDavid Hildenbrand struct resource *res; 16367b7b2721SDavid Hildenbrand int rc; 16377b7b2721SDavid Hildenbrand 16387b7b2721SDavid Hildenbrand if (!resource_name || 16397b7b2721SDavid Hildenbrand strstr(resource_name, "System RAM (") != resource_name || 16407b7b2721SDavid Hildenbrand resource_name[strlen(resource_name) - 1] != ')') 16417b7b2721SDavid Hildenbrand return -EINVAL; 16427b7b2721SDavid Hildenbrand 16437b7b2721SDavid Hildenbrand lock_device_hotplug(); 16447b7b2721SDavid Hildenbrand 16457b7b2721SDavid Hildenbrand res = register_memory_resource(start, size, resource_name); 16467b7b2721SDavid Hildenbrand if (IS_ERR(res)) { 16477b7b2721SDavid Hildenbrand rc = PTR_ERR(res); 16487b7b2721SDavid Hildenbrand goto out_unlock; 16497b7b2721SDavid Hildenbrand } 16507b7b2721SDavid Hildenbrand 1651b6117199SDavid Hildenbrand rc = add_memory_resource(nid, res, mhp_flags); 16527b7b2721SDavid Hildenbrand if (rc < 0) 16537b7b2721SDavid Hildenbrand release_memory_resource(res); 16547b7b2721SDavid Hildenbrand 16557b7b2721SDavid Hildenbrand out_unlock: 16567b7b2721SDavid Hildenbrand unlock_device_hotplug(); 16577b7b2721SDavid Hildenbrand return rc; 16587b7b2721SDavid Hildenbrand } 16597b7b2721SDavid Hildenbrand EXPORT_SYMBOL_GPL(add_memory_driver_managed); 16607b7b2721SDavid Hildenbrand 1661bca3feaaSAnshuman Khandual /* 1662bca3feaaSAnshuman Khandual * Platforms should define arch_get_mappable_range() that provides 1663bca3feaaSAnshuman Khandual * maximum possible addressable physical memory range for which the 1664bca3feaaSAnshuman Khandual * linear mapping could be created. The platform returned address 1665bca3feaaSAnshuman Khandual * range must adhere to these following semantics. 1666bca3feaaSAnshuman Khandual * 1667bca3feaaSAnshuman Khandual * - range.start <= range.end 1668bca3feaaSAnshuman Khandual * - Range includes both end points [range.start..range.end] 1669bca3feaaSAnshuman Khandual * 1670bca3feaaSAnshuman Khandual * There is also a fallback definition provided here, allowing the 1671bca3feaaSAnshuman Khandual * entire possible physical address range in case any platform does 1672bca3feaaSAnshuman Khandual * not define arch_get_mappable_range(). 1673bca3feaaSAnshuman Khandual */ 1674bca3feaaSAnshuman Khandual struct range __weak arch_get_mappable_range(void) 1675bca3feaaSAnshuman Khandual { 1676bca3feaaSAnshuman Khandual struct range mhp_range = { 1677bca3feaaSAnshuman Khandual .start = 0UL, 1678bca3feaaSAnshuman Khandual .end = -1ULL, 1679bca3feaaSAnshuman Khandual }; 1680bca3feaaSAnshuman Khandual return mhp_range; 1681bca3feaaSAnshuman Khandual } 1682bca3feaaSAnshuman Khandual 1683bca3feaaSAnshuman Khandual struct range mhp_get_pluggable_range(bool need_mapping) 1684bca3feaaSAnshuman Khandual { 1685bca3feaaSAnshuman Khandual const u64 max_phys = (1ULL << MAX_PHYSMEM_BITS) - 1; 1686bca3feaaSAnshuman Khandual struct range mhp_range; 1687bca3feaaSAnshuman Khandual 1688bca3feaaSAnshuman Khandual if (need_mapping) { 1689bca3feaaSAnshuman Khandual mhp_range = arch_get_mappable_range(); 1690bca3feaaSAnshuman Khandual if (mhp_range.start > max_phys) { 1691bca3feaaSAnshuman Khandual mhp_range.start = 0; 1692bca3feaaSAnshuman Khandual mhp_range.end = 0; 1693bca3feaaSAnshuman Khandual } 1694bca3feaaSAnshuman Khandual mhp_range.end = min_t(u64, mhp_range.end, max_phys); 1695bca3feaaSAnshuman Khandual } else { 1696bca3feaaSAnshuman Khandual mhp_range.start = 0; 1697bca3feaaSAnshuman Khandual mhp_range.end = max_phys; 1698bca3feaaSAnshuman Khandual } 1699bca3feaaSAnshuman Khandual return mhp_range; 1700bca3feaaSAnshuman Khandual } 1701bca3feaaSAnshuman Khandual EXPORT_SYMBOL_GPL(mhp_get_pluggable_range); 1702bca3feaaSAnshuman Khandual 1703bca3feaaSAnshuman Khandual bool mhp_range_allowed(u64 start, u64 size, bool need_mapping) 1704bca3feaaSAnshuman Khandual { 1705bca3feaaSAnshuman Khandual struct range mhp_range = mhp_get_pluggable_range(need_mapping); 1706bca3feaaSAnshuman Khandual u64 end = start + size; 1707bca3feaaSAnshuman Khandual 1708bca3feaaSAnshuman Khandual if (start < end && start >= mhp_range.start && (end - 1) <= mhp_range.end) 1709bca3feaaSAnshuman Khandual return true; 1710bca3feaaSAnshuman Khandual 1711bca3feaaSAnshuman Khandual pr_warn("Hotplug memory [%#llx-%#llx] exceeds maximum addressable range [%#llx-%#llx]\n", 1712bca3feaaSAnshuman Khandual start, end, mhp_range.start, mhp_range.end); 1713bca3feaaSAnshuman Khandual return false; 1714bca3feaaSAnshuman Khandual } 1715bca3feaaSAnshuman Khandual 17160c0e6195SKAMEZAWA Hiroyuki #ifdef CONFIG_MEMORY_HOTREMOVE 17170c0e6195SKAMEZAWA Hiroyuki /* 17180efadf48SYisheng Xie * Scan pfn range [start,end) to find movable/migratable pages (LRU pages, 1719aa218795SDavid Hildenbrand * non-lru movable pages and hugepages). Will skip over most unmovable 1720aa218795SDavid Hildenbrand * pages (esp., pages that can be skipped when offlining), but bail out on 1721aa218795SDavid Hildenbrand * definitely unmovable pages. 1722aa218795SDavid Hildenbrand * 1723aa218795SDavid Hildenbrand * Returns: 1724aa218795SDavid Hildenbrand * 0 in case a movable page is found and movable_pfn was updated. 1725aa218795SDavid Hildenbrand * -ENOENT in case no movable page was found. 1726aa218795SDavid Hildenbrand * -EBUSY in case a definitely unmovable page was found. 17270c0e6195SKAMEZAWA Hiroyuki */ 1728aa218795SDavid Hildenbrand static int scan_movable_pages(unsigned long start, unsigned long end, 1729aa218795SDavid Hildenbrand unsigned long *movable_pfn) 17300c0e6195SKAMEZAWA Hiroyuki { 17310c0e6195SKAMEZAWA Hiroyuki unsigned long pfn; 1732eeb0efd0SOscar Salvador 17330c0e6195SKAMEZAWA Hiroyuki for (pfn = start; pfn < end; pfn++) { 1734eeb0efd0SOscar Salvador struct page *page, *head; 1735eeb0efd0SOscar Salvador unsigned long skip; 1736eeb0efd0SOscar Salvador 1737eeb0efd0SOscar Salvador if (!pfn_valid(pfn)) 1738eeb0efd0SOscar Salvador continue; 17390c0e6195SKAMEZAWA Hiroyuki page = pfn_to_page(pfn); 17400c0e6195SKAMEZAWA Hiroyuki if (PageLRU(page)) 1741aa218795SDavid Hildenbrand goto found; 17420efadf48SYisheng Xie if (__PageMovable(page)) 1743aa218795SDavid Hildenbrand goto found; 1744aa218795SDavid Hildenbrand 1745aa218795SDavid Hildenbrand /* 1746aa218795SDavid Hildenbrand * PageOffline() pages that are not marked __PageMovable() and 1747aa218795SDavid Hildenbrand * have a reference count > 0 (after MEM_GOING_OFFLINE) are 1748aa218795SDavid Hildenbrand * definitely unmovable. If their reference count would be 0, 1749aa218795SDavid Hildenbrand * they could at least be skipped when offlining memory. 1750aa218795SDavid Hildenbrand */ 1751aa218795SDavid Hildenbrand if (PageOffline(page) && page_count(page)) 1752aa218795SDavid Hildenbrand return -EBUSY; 1753eeb0efd0SOscar Salvador 1754eeb0efd0SOscar Salvador if (!PageHuge(page)) 1755eeb0efd0SOscar Salvador continue; 1756eeb0efd0SOscar Salvador head = compound_head(page); 17578f251a3dSMike Kravetz /* 17588f251a3dSMike Kravetz * This test is racy as we hold no reference or lock. The 17598f251a3dSMike Kravetz * hugetlb page could have been free'ed and head is no longer 17608f251a3dSMike Kravetz * a hugetlb page before the following check. In such unlikely 17618f251a3dSMike Kravetz * cases false positives and negatives are possible. Calling 17628f251a3dSMike Kravetz * code must deal with these scenarios. 17638f251a3dSMike Kravetz */ 17648f251a3dSMike Kravetz if (HPageMigratable(head)) 1765aa218795SDavid Hildenbrand goto found; 17661640a0efSZi Yan skip = compound_nr(head) - (pfn - page_to_pfn(head)); 1767eeb0efd0SOscar Salvador pfn += skip - 1; 17680c0e6195SKAMEZAWA Hiroyuki } 1769aa218795SDavid Hildenbrand return -ENOENT; 1770aa218795SDavid Hildenbrand found: 1771aa218795SDavid Hildenbrand *movable_pfn = pfn; 17720c0e6195SKAMEZAWA Hiroyuki return 0; 17730c0e6195SKAMEZAWA Hiroyuki } 17740c0e6195SKAMEZAWA Hiroyuki 177532cf666eSSeongJae Park static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) 17760c0e6195SKAMEZAWA Hiroyuki { 17770c0e6195SKAMEZAWA Hiroyuki unsigned long pfn; 17786c357848SMatthew Wilcox (Oracle) struct page *page, *head; 17790c0e6195SKAMEZAWA Hiroyuki LIST_HEAD(source); 1780786dee86SLiam Mark static DEFINE_RATELIMIT_STATE(migrate_rs, DEFAULT_RATELIMIT_INTERVAL, 1781786dee86SLiam Mark DEFAULT_RATELIMIT_BURST); 17820c0e6195SKAMEZAWA Hiroyuki 1783a85009c3SMichal Hocko for (pfn = start_pfn; pfn < end_pfn; pfn++) { 1784869f7ee6SMatthew Wilcox (Oracle) struct folio *folio; 1785f7f9c00dSBaolin Wang bool isolated; 1786869f7ee6SMatthew Wilcox (Oracle) 17870c0e6195SKAMEZAWA Hiroyuki if (!pfn_valid(pfn)) 17880c0e6195SKAMEZAWA Hiroyuki continue; 17890c0e6195SKAMEZAWA Hiroyuki page = pfn_to_page(pfn); 1790869f7ee6SMatthew Wilcox (Oracle) folio = page_folio(page); 1791869f7ee6SMatthew Wilcox (Oracle) head = &folio->page; 1792c8721bbbSNaoya Horiguchi 1793c8721bbbSNaoya Horiguchi if (PageHuge(page)) { 1794d8c6546bSMatthew Wilcox (Oracle) pfn = page_to_pfn(head) + compound_nr(head) - 1; 17956aa3a920SSidhartha Kumar isolate_hugetlb(folio, &source); 1796c8721bbbSNaoya Horiguchi continue; 179794723aafSMichal Hocko } else if (PageTransHuge(page)) 17986c357848SMatthew Wilcox (Oracle) pfn = page_to_pfn(head) + thp_nr_pages(page) - 1; 1799c8721bbbSNaoya Horiguchi 1800b15c8726SMichal Hocko /* 1801b15c8726SMichal Hocko * HWPoison pages have elevated reference counts so the migration would 1802b15c8726SMichal Hocko * fail on them. It also doesn't make any sense to migrate them in the 1803b15c8726SMichal Hocko * first place. Still try to unmap such a page in case it is still mapped 1804b15c8726SMichal Hocko * (e.g. current hwpoison implementation doesn't unmap KSM pages but keep 1805b15c8726SMichal Hocko * the unmap as the catch all safety net). 1806b15c8726SMichal Hocko */ 1807b15c8726SMichal Hocko if (PageHWPoison(page)) { 1808869f7ee6SMatthew Wilcox (Oracle) if (WARN_ON(folio_test_lru(folio))) 1809869f7ee6SMatthew Wilcox (Oracle) folio_isolate_lru(folio); 1810869f7ee6SMatthew Wilcox (Oracle) if (folio_mapped(folio)) 1811869f7ee6SMatthew Wilcox (Oracle) try_to_unmap(folio, TTU_IGNORE_MLOCK); 1812b15c8726SMichal Hocko continue; 1813b15c8726SMichal Hocko } 1814b15c8726SMichal Hocko 1815700c2a46SKonstantin Khlebnikov if (!get_page_unless_zero(page)) 18160c0e6195SKAMEZAWA Hiroyuki continue; 18170c0e6195SKAMEZAWA Hiroyuki /* 18180efadf48SYisheng Xie * We can skip free pages. And we can deal with pages on 18190efadf48SYisheng Xie * LRU and non-lru movable pages. 18200c0e6195SKAMEZAWA Hiroyuki */ 1821cd775580SBaolin Wang if (PageLRU(page)) 1822f7f9c00dSBaolin Wang isolated = isolate_lru_page(page); 1823cd775580SBaolin Wang else 1824cd775580SBaolin Wang isolated = isolate_movable_page(page, ISOLATE_UNEVICTABLE); 1825cd775580SBaolin Wang if (isolated) { 182662695a84SNick Piggin list_add_tail(&page->lru, &source); 18270efadf48SYisheng Xie if (!__PageMovable(page)) 1828599d0c95SMel Gorman inc_node_page_state(page, NR_ISOLATED_ANON + 18299de4f22aSHuang Ying page_is_file_lru(page)); 18306d9c285aSKOSAKI Motohiro 18310c0e6195SKAMEZAWA Hiroyuki } else { 1832786dee86SLiam Mark if (__ratelimit(&migrate_rs)) { 18332932c8b0SMichal Hocko pr_warn("failed to isolate pfn %lx\n", pfn); 18340efadf48SYisheng Xie dump_page(page, "isolation failed"); 18351723058eSOscar Salvador } 1836786dee86SLiam Mark } 1837700c2a46SKonstantin Khlebnikov put_page(page); 18380c0e6195SKAMEZAWA Hiroyuki } 1839f3ab2636SBob Liu if (!list_empty(&source)) { 1840203e6e5cSJoonsoo Kim nodemask_t nmask = node_states[N_MEMORY]; 1841203e6e5cSJoonsoo Kim struct migration_target_control mtc = { 1842203e6e5cSJoonsoo Kim .nmask = &nmask, 1843203e6e5cSJoonsoo Kim .gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL, 1844203e6e5cSJoonsoo Kim }; 184532cf666eSSeongJae Park int ret; 1846203e6e5cSJoonsoo Kim 1847203e6e5cSJoonsoo Kim /* 1848203e6e5cSJoonsoo Kim * We have checked that migration range is on a single zone so 1849203e6e5cSJoonsoo Kim * we can use the nid of the first page to all the others. 1850203e6e5cSJoonsoo Kim */ 1851203e6e5cSJoonsoo Kim mtc.nid = page_to_nid(list_first_entry(&source, struct page, lru)); 1852203e6e5cSJoonsoo Kim 1853203e6e5cSJoonsoo Kim /* 1854203e6e5cSJoonsoo Kim * try to allocate from a different node but reuse this node 1855203e6e5cSJoonsoo Kim * if there are no other online nodes to be used (e.g. we are 1856203e6e5cSJoonsoo Kim * offlining a part of the only existing node) 1857203e6e5cSJoonsoo Kim */ 1858203e6e5cSJoonsoo Kim node_clear(mtc.nid, nmask); 1859203e6e5cSJoonsoo Kim if (nodes_empty(nmask)) 1860203e6e5cSJoonsoo Kim node_set(mtc.nid, nmask); 1861203e6e5cSJoonsoo Kim ret = migrate_pages(&source, alloc_migration_target, NULL, 18625ac95884SYang Shi (unsigned long)&mtc, MIGRATE_SYNC, MR_MEMORY_HOTPLUG, NULL); 18632932c8b0SMichal Hocko if (ret) { 18642932c8b0SMichal Hocko list_for_each_entry(page, &source, lru) { 1865786dee86SLiam Mark if (__ratelimit(&migrate_rs)) { 1866786dee86SLiam Mark pr_warn("migrating pfn %lx failed ret:%d\n", 18672932c8b0SMichal Hocko page_to_pfn(page), ret); 18682932c8b0SMichal Hocko dump_page(page, "migration failure"); 18692932c8b0SMichal Hocko } 1870786dee86SLiam Mark } 1871c8721bbbSNaoya Horiguchi putback_movable_pages(&source); 1872f3ab2636SBob Liu } 18732932c8b0SMichal Hocko } 18740c0e6195SKAMEZAWA Hiroyuki } 18750c0e6195SKAMEZAWA Hiroyuki 1876c5320926STang Chen static int __init cmdline_parse_movable_node(char *p) 1877c5320926STang Chen { 187855ac590cSTang Chen movable_node_enabled = true; 1879c5320926STang Chen return 0; 1880c5320926STang Chen } 1881c5320926STang Chen early_param("movable_node", cmdline_parse_movable_node); 1882c5320926STang Chen 1883d9713679SLai Jiangshan /* check which state of node_states will be changed when offline memory */ 1884d9713679SLai Jiangshan static void node_states_check_changes_offline(unsigned long nr_pages, 1885d9713679SLai Jiangshan struct zone *zone, struct memory_notify *arg) 1886d9713679SLai Jiangshan { 1887d9713679SLai Jiangshan struct pglist_data *pgdat = zone->zone_pgdat; 1888d9713679SLai Jiangshan unsigned long present_pages = 0; 188986b27beaSOscar Salvador enum zone_type zt; 1890d9713679SLai Jiangshan 189198fa15f3SAnshuman Khandual arg->status_change_nid = NUMA_NO_NODE; 189298fa15f3SAnshuman Khandual arg->status_change_nid_normal = NUMA_NO_NODE; 189386b27beaSOscar Salvador 189486b27beaSOscar Salvador /* 189586b27beaSOscar Salvador * Check whether node_states[N_NORMAL_MEMORY] will be changed. 189686b27beaSOscar Salvador * If the memory to be offline is within the range 189786b27beaSOscar Salvador * [0..ZONE_NORMAL], and it is the last present memory there, 189886b27beaSOscar Salvador * the zones in that range will become empty after the offlining, 189986b27beaSOscar Salvador * thus we can determine that we need to clear the node from 190086b27beaSOscar Salvador * node_states[N_NORMAL_MEMORY]. 190186b27beaSOscar Salvador */ 190286b27beaSOscar Salvador for (zt = 0; zt <= ZONE_NORMAL; zt++) 190386b27beaSOscar Salvador present_pages += pgdat->node_zones[zt].present_pages; 190486b27beaSOscar Salvador if (zone_idx(zone) <= ZONE_NORMAL && nr_pages >= present_pages) 190586b27beaSOscar Salvador arg->status_change_nid_normal = zone_to_nid(zone); 1906d9713679SLai Jiangshan 19076715ddf9SLai Jiangshan /* 19086b740c6cSDavid Hildenbrand * We have accounted the pages from [0..ZONE_NORMAL); ZONE_HIGHMEM 19096b740c6cSDavid Hildenbrand * does not apply as we don't support 32bit. 191086b27beaSOscar Salvador * Here we count the possible pages from ZONE_MOVABLE. 191186b27beaSOscar Salvador * If after having accounted all the pages, we see that the nr_pages 191286b27beaSOscar Salvador * to be offlined is over or equal to the accounted pages, 191386b27beaSOscar Salvador * we know that the node will become empty, and so, we can clear 191486b27beaSOscar Salvador * it for N_MEMORY as well. 1915d9713679SLai Jiangshan */ 191686b27beaSOscar Salvador present_pages += pgdat->node_zones[ZONE_MOVABLE].present_pages; 1917d9713679SLai Jiangshan 1918d9713679SLai Jiangshan if (nr_pages >= present_pages) 1919d9713679SLai Jiangshan arg->status_change_nid = zone_to_nid(zone); 1920d9713679SLai Jiangshan } 1921d9713679SLai Jiangshan 1922d9713679SLai Jiangshan static void node_states_clear_node(int node, struct memory_notify *arg) 1923d9713679SLai Jiangshan { 1924d9713679SLai Jiangshan if (arg->status_change_nid_normal >= 0) 1925d9713679SLai Jiangshan node_clear_state(node, N_NORMAL_MEMORY); 1926d9713679SLai Jiangshan 1927cf01f6f5SOscar Salvador if (arg->status_change_nid >= 0) 19286715ddf9SLai Jiangshan node_clear_state(node, N_MEMORY); 1929d9713679SLai Jiangshan } 1930d9713679SLai Jiangshan 1931c5e79ef5SDavid Hildenbrand static int count_system_ram_pages_cb(unsigned long start_pfn, 1932c5e79ef5SDavid Hildenbrand unsigned long nr_pages, void *data) 1933c5e79ef5SDavid Hildenbrand { 1934c5e79ef5SDavid Hildenbrand unsigned long *nr_system_ram_pages = data; 1935c5e79ef5SDavid Hildenbrand 1936c5e79ef5SDavid Hildenbrand *nr_system_ram_pages += nr_pages; 1937c5e79ef5SDavid Hildenbrand return 0; 1938c5e79ef5SDavid Hildenbrand } 1939c5e79ef5SDavid Hildenbrand 1940001002e7SSumanth Korikkar /* 1941001002e7SSumanth Korikkar * Must be called with mem_hotplug_lock in write mode. 1942001002e7SSumanth Korikkar */ 1943836809ecSDavid Hildenbrand int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages, 1944395f6081SDavid Hildenbrand struct zone *zone, struct memory_group *group) 19450c0e6195SKAMEZAWA Hiroyuki { 194673a11c96SDavid Hildenbrand const unsigned long end_pfn = start_pfn + nr_pages; 19470a1a9a00SDavid Hildenbrand unsigned long pfn, system_ram_pages = 0; 1948395f6081SDavid Hildenbrand const int node = zone_to_nid(zone); 1949d702909fSCody P Schafer unsigned long flags; 19507b78d335SYasunori Goto struct memory_notify arg; 195179605093SMichal Hocko char *reason; 1952395f6081SDavid Hildenbrand int ret; 19530c0e6195SKAMEZAWA Hiroyuki 1954dd8e2f23SOscar Salvador /* 1955dd8e2f23SOscar Salvador * {on,off}lining is constrained to full memory sections (or more 1956041711ceSZhen Lei * precisely to memory blocks from the user space POV). 1957dd8e2f23SOscar Salvador * memmap_on_memory is an exception because it reserves initial part 1958dd8e2f23SOscar Salvador * of the physical memory space for vmemmaps. That space is pageblock 1959dd8e2f23SOscar Salvador * aligned. 1960dd8e2f23SOscar Salvador */ 1961ee0913c4SKefeng Wang if (WARN_ON_ONCE(!nr_pages || !pageblock_aligned(start_pfn) || 1962dd8e2f23SOscar Salvador !IS_ALIGNED(start_pfn + nr_pages, PAGES_PER_SECTION))) 19634986fac1SDavid Hildenbrand return -EINVAL; 19644986fac1SDavid Hildenbrand 1965c5e79ef5SDavid Hildenbrand /* 1966c5e79ef5SDavid Hildenbrand * Don't allow to offline memory blocks that contain holes. 1967c5e79ef5SDavid Hildenbrand * Consequently, memory blocks with holes can never get onlined 1968c5e79ef5SDavid Hildenbrand * via the hotplug path - online_pages() - as hotplugged memory has 1969c5e79ef5SDavid Hildenbrand * no holes. This way, we e.g., don't have to worry about marking 1970c5e79ef5SDavid Hildenbrand * memory holes PG_reserved, don't need pfn_valid() checks, and can 1971c5e79ef5SDavid Hildenbrand * avoid using walk_system_ram_range() later. 1972c5e79ef5SDavid Hildenbrand */ 197373a11c96SDavid Hildenbrand walk_system_ram_range(start_pfn, nr_pages, &system_ram_pages, 1974c5e79ef5SDavid Hildenbrand count_system_ram_pages_cb); 197573a11c96SDavid Hildenbrand if (system_ram_pages != nr_pages) { 1976c5e79ef5SDavid Hildenbrand ret = -EINVAL; 1977c5e79ef5SDavid Hildenbrand reason = "memory holes"; 1978c5e79ef5SDavid Hildenbrand goto failed_removal; 1979c5e79ef5SDavid Hildenbrand } 1980c5e79ef5SDavid Hildenbrand 1981395f6081SDavid Hildenbrand /* 1982395f6081SDavid Hildenbrand * We only support offlining of memory blocks managed by a single zone, 1983395f6081SDavid Hildenbrand * checked by calling code. This is just a sanity check that we might 1984395f6081SDavid Hildenbrand * want to remove in the future. 1985395f6081SDavid Hildenbrand */ 1986395f6081SDavid Hildenbrand if (WARN_ON_ONCE(page_zone(pfn_to_page(start_pfn)) != zone || 1987395f6081SDavid Hildenbrand page_zone(pfn_to_page(end_pfn - 1)) != zone)) { 198879605093SMichal Hocko ret = -EINVAL; 198979605093SMichal Hocko reason = "multizone range"; 199079605093SMichal Hocko goto failed_removal; 1991381eab4aSDavid Hildenbrand } 19927b78d335SYasunori Goto 1993ec6e8c7eSVlastimil Babka /* 1994ec6e8c7eSVlastimil Babka * Disable pcplists so that page isolation cannot race with freeing 1995ec6e8c7eSVlastimil Babka * in a way that pages from isolated pageblock are left on pcplists. 1996ec6e8c7eSVlastimil Babka */ 1997ec6e8c7eSVlastimil Babka zone_pcp_disable(zone); 1998d479960eSMinchan Kim lru_cache_disable(); 1999ec6e8c7eSVlastimil Babka 20000c0e6195SKAMEZAWA Hiroyuki /* set above range as isolated */ 2001b023f468SWen Congyang ret = start_isolate_page_range(start_pfn, end_pfn, 2002d381c547SMichal Hocko MIGRATE_MOVABLE, 2003b2c9e2fbSZi Yan MEMORY_OFFLINE | REPORT_FAILURE, 2004b2c9e2fbSZi Yan GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL); 20053fa0c7c7SDavid Hildenbrand if (ret) { 200679605093SMichal Hocko reason = "failure to isolate range"; 2007ec6e8c7eSVlastimil Babka goto failed_removal_pcplists_disabled; 2008381eab4aSDavid Hildenbrand } 20097b78d335SYasunori Goto 20107b78d335SYasunori Goto arg.start_pfn = start_pfn; 20117b78d335SYasunori Goto arg.nr_pages = nr_pages; 2012d9713679SLai Jiangshan node_states_check_changes_offline(nr_pages, zone, &arg); 20137b78d335SYasunori Goto 20147b78d335SYasunori Goto ret = memory_notify(MEM_GOING_OFFLINE, &arg); 20157b78d335SYasunori Goto ret = notifier_to_errno(ret); 201679605093SMichal Hocko if (ret) { 201779605093SMichal Hocko reason = "notifier failure"; 201879605093SMichal Hocko goto failed_removal_isolated; 201979605093SMichal Hocko } 20207b78d335SYasunori Goto 2021bb8965bdSMichal Hocko do { 2022aa218795SDavid Hildenbrand pfn = start_pfn; 2023aa218795SDavid Hildenbrand do { 2024de7cb03dSDavid Hildenbrand /* 2025de7cb03dSDavid Hildenbrand * Historically we always checked for any signal and 2026de7cb03dSDavid Hildenbrand * can't limit it to fatal signals without eventually 2027de7cb03dSDavid Hildenbrand * breaking user space. 2028de7cb03dSDavid Hildenbrand */ 202979605093SMichal Hocko if (signal_pending(current)) { 2030bb8965bdSMichal Hocko ret = -EINTR; 203179605093SMichal Hocko reason = "signal backoff"; 203279605093SMichal Hocko goto failed_removal_isolated; 203379605093SMichal Hocko } 203472b39cfcSMichal Hocko 20350c0e6195SKAMEZAWA Hiroyuki cond_resched(); 20360c0e6195SKAMEZAWA Hiroyuki 2037aa218795SDavid Hildenbrand ret = scan_movable_pages(pfn, end_pfn, &pfn); 2038aa218795SDavid Hildenbrand if (!ret) { 2039bb8965bdSMichal Hocko /* 2040bb8965bdSMichal Hocko * TODO: fatal migration failures should bail 2041bb8965bdSMichal Hocko * out 2042bb8965bdSMichal Hocko */ 2043bb8965bdSMichal Hocko do_migrate_range(pfn, end_pfn); 2044bb8965bdSMichal Hocko } 2045aa218795SDavid Hildenbrand } while (!ret); 2046aa218795SDavid Hildenbrand 2047aa218795SDavid Hildenbrand if (ret != -ENOENT) { 2048aa218795SDavid Hildenbrand reason = "unmovable page"; 2049aa218795SDavid Hildenbrand goto failed_removal_isolated; 20500c0e6195SKAMEZAWA Hiroyuki } 205172b39cfcSMichal Hocko 2052c8721bbbSNaoya Horiguchi /* 2053bb8965bdSMichal Hocko * Dissolve free hugepages in the memory block before doing 2054bb8965bdSMichal Hocko * offlining actually in order to make hugetlbfs's object 2055bb8965bdSMichal Hocko * counting consistent. 2056c8721bbbSNaoya Horiguchi */ 2057082d5b6bSGerald Schaefer ret = dissolve_free_huge_pages(start_pfn, end_pfn); 205879605093SMichal Hocko if (ret) { 205979605093SMichal Hocko reason = "failure to dissolve huge pages"; 206079605093SMichal Hocko goto failed_removal_isolated; 206179605093SMichal Hocko } 20620a1a9a00SDavid Hildenbrand 20630a1a9a00SDavid Hildenbrand ret = test_pages_isolated(start_pfn, end_pfn, MEMORY_OFFLINE); 2064ec6e8c7eSVlastimil Babka 20655557c766SMichal Hocko } while (ret); 2066bb8965bdSMichal Hocko 20670a1a9a00SDavid Hildenbrand /* Mark all sections offline and remove free pages from the buddy. */ 20680a1a9a00SDavid Hildenbrand __offline_isolated_pages(start_pfn, end_pfn); 20697c33023aSLaurent Dufour pr_debug("Offlined Pages %ld\n", nr_pages); 20700a1a9a00SDavid Hildenbrand 20719b7ea46aSQian Cai /* 2072b30c5927SDavid Hildenbrand * The memory sections are marked offline, and the pageblock flags 2073b30c5927SDavid Hildenbrand * effectively stale; nobody should be touching them. Fixup the number 2074b30c5927SDavid Hildenbrand * of isolated pageblocks, memory onlining will properly revert this. 20759b7ea46aSQian Cai */ 20769b7ea46aSQian Cai spin_lock_irqsave(&zone->lock, flags); 2077ea15153cSDavid Hildenbrand zone->nr_isolate_pageblock -= nr_pages / pageblock_nr_pages; 20789b7ea46aSQian Cai spin_unlock_irqrestore(&zone->lock, flags); 20799b7ea46aSQian Cai 2080d479960eSMinchan Kim lru_cache_enable(); 2081ec6e8c7eSVlastimil Babka zone_pcp_enable(zone); 2082ec6e8c7eSVlastimil Babka 20830c0e6195SKAMEZAWA Hiroyuki /* removal success */ 20840a1a9a00SDavid Hildenbrand adjust_managed_page_count(pfn_to_page(start_pfn), -nr_pages); 2085836809ecSDavid Hildenbrand adjust_present_page_count(pfn_to_page(start_pfn), group, -nr_pages); 20867b78d335SYasunori Goto 2087b92ca18eSMel Gorman /* reinitialise watermarks and update pcp limits */ 20881b79acc9SKOSAKI Motohiro init_per_zone_wmark_min(); 20891b79acc9SKOSAKI Motohiro 2090b7812c86SQi Zheng /* 2091b7812c86SQi Zheng * Make sure to mark the node as memory-less before rebuilding the zone 2092b7812c86SQi Zheng * list. Otherwise this node would still appear in the fallback lists. 2093b7812c86SQi Zheng */ 2094b7812c86SQi Zheng node_states_clear_node(node, &arg); 20951e8537baSXishi Qiu if (!populated_zone(zone)) { 2096340175b7SJiang Liu zone_pcp_reset(zone); 209772675e13SMichal Hocko build_all_zonelists(NULL); 2098b92ca18eSMel Gorman } 2099340175b7SJiang Liu 2100698b1b30SVlastimil Babka if (arg.status_change_nid >= 0) { 2101698b1b30SVlastimil Babka kcompactd_stop(node); 2102b4a0215eSKefeng Wang kswapd_stop(node); 2103698b1b30SVlastimil Babka } 2104bce7394aSMinchan Kim 21050c0e6195SKAMEZAWA Hiroyuki writeback_set_ratelimit(); 21067b78d335SYasunori Goto 21077b78d335SYasunori Goto memory_notify(MEM_OFFLINE, &arg); 2108feee6b29SDavid Hildenbrand remove_pfn_range_from_zone(zone, start_pfn, nr_pages); 21090c0e6195SKAMEZAWA Hiroyuki return 0; 21100c0e6195SKAMEZAWA Hiroyuki 211179605093SMichal Hocko failed_removal_isolated: 211236ba30bcSMiaohe Lin /* pushback to free area */ 211379605093SMichal Hocko undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); 2114c4efe484SQian Cai memory_notify(MEM_CANCEL_OFFLINE, &arg); 2115ec6e8c7eSVlastimil Babka failed_removal_pcplists_disabled: 2116946746d1SMiaohe Lin lru_cache_enable(); 2117ec6e8c7eSVlastimil Babka zone_pcp_enable(zone); 21180c0e6195SKAMEZAWA Hiroyuki failed_removal: 211979605093SMichal Hocko pr_debug("memory offlining [mem %#010llx-%#010llx] failed due to %s\n", 2120a62e2f4fSBjorn Helgaas (unsigned long long) start_pfn << PAGE_SHIFT, 212179605093SMichal Hocko ((unsigned long long) end_pfn << PAGE_SHIFT) - 1, 212279605093SMichal Hocko reason); 21230c0e6195SKAMEZAWA Hiroyuki return ret; 21240c0e6195SKAMEZAWA Hiroyuki } 212571088785SBadari Pulavarty 2126d6de9d53SXishi Qiu static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) 2127bbc76be6SWen Congyang { 2128e1c158e4SDavid Hildenbrand int *nid = arg; 2129bbc76be6SWen Congyang 2130e1c158e4SDavid Hildenbrand *nid = mem->nid; 2131639118d1SKefeng Wang if (unlikely(mem->state != MEM_OFFLINE)) { 2132349daa0fSRandy Dunlap phys_addr_t beginpa, endpa; 2133349daa0fSRandy Dunlap 2134349daa0fSRandy Dunlap beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); 2135b6c88d3bSDavid Hildenbrand endpa = beginpa + memory_block_size_bytes() - 1; 2136756a025fSJoe Perches pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n", 2137349daa0fSRandy Dunlap &beginpa, &endpa); 2138bbc76be6SWen Congyang 2139eca499abSPavel Tatashin return -EBUSY; 2140eca499abSPavel Tatashin } 2141eca499abSPavel Tatashin return 0; 2142bbc76be6SWen Congyang } 2143bbc76be6SWen Congyang 21446b8f0798SVishal Verma static int count_memory_range_altmaps_cb(struct memory_block *mem, void *arg) 2145a08a2ae3SOscar Salvador { 21466b8f0798SVishal Verma u64 *num_altmaps = (u64 *)arg; 21476b8f0798SVishal Verma 21486b8f0798SVishal Verma if (mem->altmap) 21496b8f0798SVishal Verma *num_altmaps += 1; 21506b8f0798SVishal Verma 21511a8c64e1SAneesh Kumar K.V return 0; 2152a08a2ae3SOscar Salvador } 2153a08a2ae3SOscar Salvador 2154b27340a5SMiaohe Lin static int check_cpu_on_node(int nid) 215560a5a19eSTang Chen { 215660a5a19eSTang Chen int cpu; 215760a5a19eSTang Chen 215860a5a19eSTang Chen for_each_present_cpu(cpu) { 2159b27340a5SMiaohe Lin if (cpu_to_node(cpu) == nid) 216060a5a19eSTang Chen /* 216160a5a19eSTang Chen * the cpu on this node isn't removed, and we can't 216260a5a19eSTang Chen * offline this node. 216360a5a19eSTang Chen */ 216460a5a19eSTang Chen return -EBUSY; 216560a5a19eSTang Chen } 216660a5a19eSTang Chen 216760a5a19eSTang Chen return 0; 216860a5a19eSTang Chen } 216960a5a19eSTang Chen 21702c91f8fcSDavid Hildenbrand static int check_no_memblock_for_node_cb(struct memory_block *mem, void *arg) 21712c91f8fcSDavid Hildenbrand { 21722c91f8fcSDavid Hildenbrand int nid = *(int *)arg; 21732c91f8fcSDavid Hildenbrand 21742c91f8fcSDavid Hildenbrand /* 21752c91f8fcSDavid Hildenbrand * If a memory block belongs to multiple nodes, the stored nid is not 21762c91f8fcSDavid Hildenbrand * reliable. However, such blocks are always online (e.g., cannot get 21772c91f8fcSDavid Hildenbrand * offlined) and, therefore, are still spanned by the node. 21782c91f8fcSDavid Hildenbrand */ 21792c91f8fcSDavid Hildenbrand return mem->nid == nid ? -EEXIST : 0; 21802c91f8fcSDavid Hildenbrand } 21812c91f8fcSDavid Hildenbrand 21820f1cfe9dSToshi Kani /** 21830f1cfe9dSToshi Kani * try_offline_node 2184e8b098fcSMike Rapoport * @nid: the node ID 21850f1cfe9dSToshi Kani * 21860f1cfe9dSToshi Kani * Offline a node if all memory sections and cpus of the node are removed. 21870f1cfe9dSToshi Kani * 21880f1cfe9dSToshi Kani * NOTE: The caller must call lock_device_hotplug() to serialize hotplug 21890f1cfe9dSToshi Kani * and online/offline operations before this call. 21900f1cfe9dSToshi Kani */ 219190b30cdcSWen Congyang void try_offline_node(int nid) 219260a5a19eSTang Chen { 21932c91f8fcSDavid Hildenbrand int rc; 219460a5a19eSTang Chen 219560a5a19eSTang Chen /* 21962c91f8fcSDavid Hildenbrand * If the node still spans pages (especially ZONE_DEVICE), don't 21972c91f8fcSDavid Hildenbrand * offline it. A node spans memory after move_pfn_range_to_zone(), 21982c91f8fcSDavid Hildenbrand * e.g., after the memory block was onlined. 219960a5a19eSTang Chen */ 2200b27340a5SMiaohe Lin if (node_spanned_pages(nid)) 220160a5a19eSTang Chen return; 22022c91f8fcSDavid Hildenbrand 22032c91f8fcSDavid Hildenbrand /* 22042c91f8fcSDavid Hildenbrand * Especially offline memory blocks might not be spanned by the 22052c91f8fcSDavid Hildenbrand * node. They will get spanned by the node once they get onlined. 22062c91f8fcSDavid Hildenbrand * However, they link to the node in sysfs and can get onlined later. 22072c91f8fcSDavid Hildenbrand */ 22082c91f8fcSDavid Hildenbrand rc = for_each_memory_block(&nid, check_no_memblock_for_node_cb); 22092c91f8fcSDavid Hildenbrand if (rc) 22102c91f8fcSDavid Hildenbrand return; 221160a5a19eSTang Chen 2212b27340a5SMiaohe Lin if (check_cpu_on_node(nid)) 221360a5a19eSTang Chen return; 221460a5a19eSTang Chen 221560a5a19eSTang Chen /* 221660a5a19eSTang Chen * all memory/cpu of this node are removed, we can offline this 221760a5a19eSTang Chen * node now. 221860a5a19eSTang Chen */ 221960a5a19eSTang Chen node_set_offline(nid); 222060a5a19eSTang Chen unregister_one_node(nid); 222160a5a19eSTang Chen } 222290b30cdcSWen Congyang EXPORT_SYMBOL(try_offline_node); 222360a5a19eSTang Chen 22246b8f0798SVishal Verma static int memory_blocks_have_altmaps(u64 start, u64 size) 22256b8f0798SVishal Verma { 22266b8f0798SVishal Verma u64 num_memblocks = size / memory_block_size_bytes(); 22276b8f0798SVishal Verma u64 num_altmaps = 0; 22286b8f0798SVishal Verma 22296b8f0798SVishal Verma if (!mhp_memmap_on_memory()) 22306b8f0798SVishal Verma return 0; 22316b8f0798SVishal Verma 22326b8f0798SVishal Verma walk_memory_blocks(start, size, &num_altmaps, 22336b8f0798SVishal Verma count_memory_range_altmaps_cb); 22346b8f0798SVishal Verma 22356b8f0798SVishal Verma if (num_altmaps == 0) 22366b8f0798SVishal Verma return 0; 22376b8f0798SVishal Verma 22386b8f0798SVishal Verma if (WARN_ON_ONCE(num_memblocks != num_altmaps)) 22396b8f0798SVishal Verma return -EINVAL; 22406b8f0798SVishal Verma 22416b8f0798SVishal Verma return 1; 22426b8f0798SVishal Verma } 22436b8f0798SVishal Verma 2244e1c158e4SDavid Hildenbrand static int __ref try_remove_memory(u64 start, u64 size) 2245bbc76be6SWen Congyang { 22466b8f0798SVishal Verma int rc, nid = NUMA_NO_NODE; 2247993c1aadSWen Congyang 224827356f54SToshi Kani BUG_ON(check_hotplug_memory_range(start, size)); 224927356f54SToshi Kani 22506677e3eaSYasuaki Ishimatsu /* 2251242831ebSRafael J. Wysocki * All memory blocks must be offlined before removing memory. Check 2252eca499abSPavel Tatashin * whether all memory blocks in question are offline and return error 2253242831ebSRafael J. Wysocki * if this is not the case. 2254e1c158e4SDavid Hildenbrand * 2255e1c158e4SDavid Hildenbrand * While at it, determine the nid. Note that if we'd have mixed nodes, 2256e1c158e4SDavid Hildenbrand * we'd only try to offline the last determined one -- which is good 2257e1c158e4SDavid Hildenbrand * enough for the cases we care about. 22586677e3eaSYasuaki Ishimatsu */ 2259e1c158e4SDavid Hildenbrand rc = walk_memory_blocks(start, size, &nid, check_memblock_offlined_cb); 2260eca499abSPavel Tatashin if (rc) 2261b4223a51SJia He return rc; 22626677e3eaSYasuaki Ishimatsu 226346c66c4bSYasuaki Ishimatsu /* remove memmap entry */ 226446c66c4bSYasuaki Ishimatsu firmware_map_remove(start, start + size, "System RAM"); 226546c66c4bSYasuaki Ishimatsu 22666b8f0798SVishal Verma mem_hotplug_begin(); 22676b8f0798SVishal Verma 22686b8f0798SVishal Verma rc = memory_blocks_have_altmaps(start, size); 22696b8f0798SVishal Verma if (rc < 0) { 22706b8f0798SVishal Verma mem_hotplug_done(); 22716b8f0798SVishal Verma return rc; 22726b8f0798SVishal Verma } else if (!rc) { 2273f1037ec0SDan Williams /* 2274f1037ec0SDan Williams * Memory block device removal under the device_hotplug_lock is 2275f1037ec0SDan Williams * a barrier against racing online attempts. 22766b8f0798SVishal Verma * No altmaps present, do the removal directly 2277f1037ec0SDan Williams */ 22784c4b7f9bSDavid Hildenbrand remove_memory_block_devices(start, size); 22796b8f0798SVishal Verma arch_remove_memory(start, size, NULL); 22806b8f0798SVishal Verma } else { 22816b8f0798SVishal Verma /* all memblocks in the range have altmaps */ 22826b8f0798SVishal Verma remove_memory_blocks_and_altmaps(start, size); 22831a8c64e1SAneesh Kumar K.V } 22841a8c64e1SAneesh Kumar K.V 228552219aeaSDavid Hildenbrand if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) { 22863ecc6834SMike Rapoport memblock_phys_free(start, size); 228732d1fe8fSAnshuman Khandual memblock_remove(start, size); 228852219aeaSDavid Hildenbrand } 228952219aeaSDavid Hildenbrand 2290cb8e3c8bSDavid Hildenbrand release_mem_region_adjustable(start, size); 229124d335caSWen Congyang 2292e1c158e4SDavid Hildenbrand if (nid != NUMA_NO_NODE) 229360a5a19eSTang Chen try_offline_node(nid); 229460a5a19eSTang Chen 2295bfc8c901SVladimir Davydov mem_hotplug_done(); 2296b4223a51SJia He return 0; 229771088785SBadari Pulavarty } 2298d15e5926SDavid Hildenbrand 2299eca499abSPavel Tatashin /** 23005640c9caSMel Gorman * __remove_memory - Remove memory if every memory block is offline 2301eca499abSPavel Tatashin * @start: physical address of the region to remove 2302eca499abSPavel Tatashin * @size: size of the region to remove 2303eca499abSPavel Tatashin * 2304eca499abSPavel Tatashin * NOTE: The caller must call lock_device_hotplug() to serialize hotplug 2305eca499abSPavel Tatashin * and online/offline operations before this call, as required by 2306eca499abSPavel Tatashin * try_offline_node(). 2307eca499abSPavel Tatashin */ 2308e1c158e4SDavid Hildenbrand void __remove_memory(u64 start, u64 size) 2309d15e5926SDavid Hildenbrand { 2310eca499abSPavel Tatashin 2311eca499abSPavel Tatashin /* 231229a90db9SSouptick Joarder * trigger BUG() if some memory is not offlined prior to calling this 2313eca499abSPavel Tatashin * function 2314eca499abSPavel Tatashin */ 2315e1c158e4SDavid Hildenbrand if (try_remove_memory(start, size)) 2316eca499abSPavel Tatashin BUG(); 2317eca499abSPavel Tatashin } 2318eca499abSPavel Tatashin 2319eca499abSPavel Tatashin /* 2320eca499abSPavel Tatashin * Remove memory if every memory block is offline, otherwise return -EBUSY is 2321eca499abSPavel Tatashin * some memory is not offline 2322eca499abSPavel Tatashin */ 2323e1c158e4SDavid Hildenbrand int remove_memory(u64 start, u64 size) 2324eca499abSPavel Tatashin { 2325eca499abSPavel Tatashin int rc; 2326eca499abSPavel Tatashin 2327d15e5926SDavid Hildenbrand lock_device_hotplug(); 2328e1c158e4SDavid Hildenbrand rc = try_remove_memory(start, size); 2329d15e5926SDavid Hildenbrand unlock_device_hotplug(); 2330eca499abSPavel Tatashin 2331eca499abSPavel Tatashin return rc; 2332d15e5926SDavid Hildenbrand } 233371088785SBadari Pulavarty EXPORT_SYMBOL_GPL(remove_memory); 233408b3acd7SDavid Hildenbrand 23358dc4bb58SDavid Hildenbrand static int try_offline_memory_block(struct memory_block *mem, void *arg) 23368dc4bb58SDavid Hildenbrand { 23378dc4bb58SDavid Hildenbrand uint8_t online_type = MMOP_ONLINE_KERNEL; 23388dc4bb58SDavid Hildenbrand uint8_t **online_types = arg; 23398dc4bb58SDavid Hildenbrand struct page *page; 23408dc4bb58SDavid Hildenbrand int rc; 23418dc4bb58SDavid Hildenbrand 234208b3acd7SDavid Hildenbrand /* 23438dc4bb58SDavid Hildenbrand * Sense the online_type via the zone of the memory block. Offlining 23448dc4bb58SDavid Hildenbrand * with multiple zones within one memory block will be rejected 23458dc4bb58SDavid Hildenbrand * by offlining code ... so we don't care about that. 23468dc4bb58SDavid Hildenbrand */ 23478dc4bb58SDavid Hildenbrand page = pfn_to_online_page(section_nr_to_pfn(mem->start_section_nr)); 23488dc4bb58SDavid Hildenbrand if (page && zone_idx(page_zone(page)) == ZONE_MOVABLE) 23498dc4bb58SDavid Hildenbrand online_type = MMOP_ONLINE_MOVABLE; 23508dc4bb58SDavid Hildenbrand 23518dc4bb58SDavid Hildenbrand rc = device_offline(&mem->dev); 23528dc4bb58SDavid Hildenbrand /* 23538dc4bb58SDavid Hildenbrand * Default is MMOP_OFFLINE - change it only if offlining succeeded, 23548dc4bb58SDavid Hildenbrand * so try_reonline_memory_block() can do the right thing. 23558dc4bb58SDavid Hildenbrand */ 23568dc4bb58SDavid Hildenbrand if (!rc) 23578dc4bb58SDavid Hildenbrand **online_types = online_type; 23588dc4bb58SDavid Hildenbrand 23598dc4bb58SDavid Hildenbrand (*online_types)++; 23608dc4bb58SDavid Hildenbrand /* Ignore if already offline. */ 23618dc4bb58SDavid Hildenbrand return rc < 0 ? rc : 0; 23628dc4bb58SDavid Hildenbrand } 23638dc4bb58SDavid Hildenbrand 23648dc4bb58SDavid Hildenbrand static int try_reonline_memory_block(struct memory_block *mem, void *arg) 23658dc4bb58SDavid Hildenbrand { 23668dc4bb58SDavid Hildenbrand uint8_t **online_types = arg; 23678dc4bb58SDavid Hildenbrand int rc; 23688dc4bb58SDavid Hildenbrand 23698dc4bb58SDavid Hildenbrand if (**online_types != MMOP_OFFLINE) { 23708dc4bb58SDavid Hildenbrand mem->online_type = **online_types; 23718dc4bb58SDavid Hildenbrand rc = device_online(&mem->dev); 23728dc4bb58SDavid Hildenbrand if (rc < 0) 23738dc4bb58SDavid Hildenbrand pr_warn("%s: Failed to re-online memory: %d", 23748dc4bb58SDavid Hildenbrand __func__, rc); 23758dc4bb58SDavid Hildenbrand } 23768dc4bb58SDavid Hildenbrand 23778dc4bb58SDavid Hildenbrand /* Continue processing all remaining memory blocks. */ 23788dc4bb58SDavid Hildenbrand (*online_types)++; 23798dc4bb58SDavid Hildenbrand return 0; 23808dc4bb58SDavid Hildenbrand } 23818dc4bb58SDavid Hildenbrand 23828dc4bb58SDavid Hildenbrand /* 23838dc4bb58SDavid Hildenbrand * Try to offline and remove memory. Might take a long time to finish in case 23848dc4bb58SDavid Hildenbrand * memory is still in use. Primarily useful for memory devices that logically 23858dc4bb58SDavid Hildenbrand * unplugged all memory (so it's no longer in use) and want to offline + remove 23868dc4bb58SDavid Hildenbrand * that memory. 238708b3acd7SDavid Hildenbrand */ 2388e1c158e4SDavid Hildenbrand int offline_and_remove_memory(u64 start, u64 size) 238908b3acd7SDavid Hildenbrand { 23908dc4bb58SDavid Hildenbrand const unsigned long mb_count = size / memory_block_size_bytes(); 23918dc4bb58SDavid Hildenbrand uint8_t *online_types, *tmp; 23928dc4bb58SDavid Hildenbrand int rc; 239308b3acd7SDavid Hildenbrand 239408b3acd7SDavid Hildenbrand if (!IS_ALIGNED(start, memory_block_size_bytes()) || 23958dc4bb58SDavid Hildenbrand !IS_ALIGNED(size, memory_block_size_bytes()) || !size) 23968dc4bb58SDavid Hildenbrand return -EINVAL; 239708b3acd7SDavid Hildenbrand 239808b3acd7SDavid Hildenbrand /* 23998dc4bb58SDavid Hildenbrand * We'll remember the old online type of each memory block, so we can 24008dc4bb58SDavid Hildenbrand * try to revert whatever we did when offlining one memory block fails 24018dc4bb58SDavid Hildenbrand * after offlining some others succeeded. 24028dc4bb58SDavid Hildenbrand */ 24038dc4bb58SDavid Hildenbrand online_types = kmalloc_array(mb_count, sizeof(*online_types), 24048dc4bb58SDavid Hildenbrand GFP_KERNEL); 24058dc4bb58SDavid Hildenbrand if (!online_types) 24068dc4bb58SDavid Hildenbrand return -ENOMEM; 24078dc4bb58SDavid Hildenbrand /* 24088dc4bb58SDavid Hildenbrand * Initialize all states to MMOP_OFFLINE, so when we abort processing in 24098dc4bb58SDavid Hildenbrand * try_offline_memory_block(), we'll skip all unprocessed blocks in 24108dc4bb58SDavid Hildenbrand * try_reonline_memory_block(). 24118dc4bb58SDavid Hildenbrand */ 24128dc4bb58SDavid Hildenbrand memset(online_types, MMOP_OFFLINE, mb_count); 24138dc4bb58SDavid Hildenbrand 24148dc4bb58SDavid Hildenbrand lock_device_hotplug(); 24158dc4bb58SDavid Hildenbrand 24168dc4bb58SDavid Hildenbrand tmp = online_types; 24178dc4bb58SDavid Hildenbrand rc = walk_memory_blocks(start, size, &tmp, try_offline_memory_block); 24188dc4bb58SDavid Hildenbrand 24198dc4bb58SDavid Hildenbrand /* 24208dc4bb58SDavid Hildenbrand * In case we succeeded to offline all memory, remove it. 242108b3acd7SDavid Hildenbrand * This cannot fail as it cannot get onlined in the meantime. 242208b3acd7SDavid Hildenbrand */ 242308b3acd7SDavid Hildenbrand if (!rc) { 2424e1c158e4SDavid Hildenbrand rc = try_remove_memory(start, size); 24258dc4bb58SDavid Hildenbrand if (rc) 24268dc4bb58SDavid Hildenbrand pr_err("%s: Failed to remove memory: %d", __func__, rc); 24278dc4bb58SDavid Hildenbrand } 24288dc4bb58SDavid Hildenbrand 24298dc4bb58SDavid Hildenbrand /* 24308dc4bb58SDavid Hildenbrand * Rollback what we did. While memory onlining might theoretically fail 24318dc4bb58SDavid Hildenbrand * (nacked by a notifier), it barely ever happens. 24328dc4bb58SDavid Hildenbrand */ 24338dc4bb58SDavid Hildenbrand if (rc) { 24348dc4bb58SDavid Hildenbrand tmp = online_types; 24358dc4bb58SDavid Hildenbrand walk_memory_blocks(start, size, &tmp, 24368dc4bb58SDavid Hildenbrand try_reonline_memory_block); 243708b3acd7SDavid Hildenbrand } 243808b3acd7SDavid Hildenbrand unlock_device_hotplug(); 243908b3acd7SDavid Hildenbrand 24408dc4bb58SDavid Hildenbrand kfree(online_types); 244108b3acd7SDavid Hildenbrand return rc; 244208b3acd7SDavid Hildenbrand } 244308b3acd7SDavid Hildenbrand EXPORT_SYMBOL_GPL(offline_and_remove_memory); 2444aba6efc4SRafael J. Wysocki #endif /* CONFIG_MEMORY_HOTREMOVE */ 2445