1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * include/linux/memory.h - generic memory definition 4 * 5 * This is mainly for topological representation. We define the 6 * basic "struct memory_block" here, which can be embedded in per-arch 7 * definitions or NUMA information. 8 * 9 * Basic handling of the devices is done in drivers/base/memory.c 10 * and system devices are handled in drivers/base/sys.c. 11 * 12 * Memory block are exported via sysfs in the class/memory/devices/ 13 * directory. 14 * 15 */ 16#ifndef _LINUX_MEMORY_H_ 17#define _LINUX_MEMORY_H_ 18 19#include <linux/node.h> 20#include <linux/compiler.h> 21#include <linux/mutex.h> 22#include <linux/notifier.h> 23 24#define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS) 25 26struct memory_block { 27 unsigned long start_section_nr; 28 unsigned long end_section_nr; 29 unsigned long state; /* serialized by the dev->lock */ 30 int section_count; /* serialized by mem_sysfs_mutex */ 31 int online_type; /* for passing data to online routine */ 32 int phys_device; /* to which fru does this belong? */ 33 void *hw; /* optional pointer to fw/hw data */ 34 int (*phys_callback)(struct memory_block *); 35 struct device dev; 36 int nid; /* NID for this memory block */ 37}; 38 39int arch_get_memory_phys_device(unsigned long start_pfn); 40unsigned long memory_block_size_bytes(void); 41int set_memory_block_size_order(unsigned int order); 42 43/* These states are exposed to userspace as text strings in sysfs */ 44#define MEM_ONLINE (1<<0) /* exposed to userspace */ 45#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */ 46#define MEM_OFFLINE (1<<2) /* exposed to userspace */ 47#define MEM_GOING_ONLINE (1<<3) 48#define MEM_CANCEL_ONLINE (1<<4) 49#define MEM_CANCEL_OFFLINE (1<<5) 50 51struct memory_notify { 52 unsigned long start_pfn; 53 unsigned long nr_pages; 54 int status_change_nid_normal; 55 int status_change_nid_high; 56 int status_change_nid; 57}; 58 59/* 60 * During pageblock isolation, count the number of pages within the 61 * range [start_pfn, start_pfn + nr_pages) which are owned by code 62 * in the notifier chain. 63 */ 64#define MEM_ISOLATE_COUNT (1<<0) 65 66struct memory_isolate_notify { 67 unsigned long start_pfn; /* Start of range to check */ 68 unsigned int nr_pages; /* # pages in range to check */ 69 unsigned int pages_found; /* # pages owned found by callbacks */ 70}; 71 72struct notifier_block; 73struct mem_section; 74 75/* 76 * Priorities for the hotplug memory callback routines (stored in decreasing 77 * order in the callback chain) 78 */ 79#define SLAB_CALLBACK_PRI 1 80#define IPC_CALLBACK_PRI 10 81 82#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE 83static inline int memory_dev_init(void) 84{ 85 return 0; 86} 87static inline int register_memory_notifier(struct notifier_block *nb) 88{ 89 return 0; 90} 91static inline void unregister_memory_notifier(struct notifier_block *nb) 92{ 93} 94static inline int memory_notify(unsigned long val, void *v) 95{ 96 return 0; 97} 98static inline int register_memory_isolate_notifier(struct notifier_block *nb) 99{ 100 return 0; 101} 102static inline void unregister_memory_isolate_notifier(struct notifier_block *nb) 103{ 104} 105static inline int memory_isolate_notify(unsigned long val, void *v) 106{ 107 return 0; 108} 109#else 110extern int register_memory_notifier(struct notifier_block *nb); 111extern void unregister_memory_notifier(struct notifier_block *nb); 112extern int register_memory_isolate_notifier(struct notifier_block *nb); 113extern void unregister_memory_isolate_notifier(struct notifier_block *nb); 114int hotplug_memory_register(int nid, struct mem_section *section); 115#ifdef CONFIG_MEMORY_HOTREMOVE 116extern int unregister_memory_section(struct mem_section *); 117#endif 118extern int memory_dev_init(void); 119extern int memory_notify(unsigned long val, void *v); 120extern int memory_isolate_notify(unsigned long val, void *v); 121extern struct memory_block *find_memory_block_hinted(struct mem_section *, 122 struct memory_block *); 123extern struct memory_block *find_memory_block(struct mem_section *); 124#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) 125#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 126 127#ifdef CONFIG_MEMORY_HOTPLUG 128#define hotplug_memory_notifier(fn, pri) ({ \ 129 static __meminitdata struct notifier_block fn##_mem_nb =\ 130 { .notifier_call = fn, .priority = pri };\ 131 register_memory_notifier(&fn##_mem_nb); \ 132}) 133#define register_hotmemory_notifier(nb) register_memory_notifier(nb) 134#define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb) 135#else 136#define hotplug_memory_notifier(fn, pri) ({ 0; }) 137/* These aren't inline functions due to a GCC bug. */ 138#define register_hotmemory_notifier(nb) ({ (void)(nb); 0; }) 139#define unregister_hotmemory_notifier(nb) ({ (void)(nb); }) 140#endif 141 142/* 143 * Kernel text modification mutex, used for code patching. Users of this lock 144 * can sleep. 145 */ 146extern struct mutex text_mutex; 147 148#endif /* _LINUX_MEMORY_H_ */ 149