1/* 2 * include/linux/memory.h - generic memory definition 3 * 4 * This is mainly for topological representation. We define the 5 * basic "struct memory_block" here, which can be embedded in per-arch 6 * definitions or NUMA information. 7 * 8 * Basic handling of the devices is done in drivers/base/memory.c 9 * and system devices are handled in drivers/base/sys.c. 10 * 11 * Memory block are exported via sysfs in the class/memory/devices/ 12 * directory. 13 * 14 */ 15#ifndef _LINUX_MEMORY_H_ 16#define _LINUX_MEMORY_H_ 17 18#include <linux/node.h> 19#include <linux/compiler.h> 20#include <linux/mutex.h> 21 22#define MIN_MEMORY_BLOCK_SIZE (1 << SECTION_SIZE_BITS) 23 24struct memory_block { 25 unsigned long start_section_nr; 26 unsigned long end_section_nr; 27 unsigned long state; 28 int section_count; 29 30 /* 31 * This serializes all state change requests. It isn't 32 * held during creation because the control files are 33 * created long after the critical areas during 34 * initialization. 35 */ 36 struct mutex state_mutex; 37 int phys_device; /* to which fru does this belong? */ 38 void *hw; /* optional pointer to fw/hw data */ 39 int (*phys_callback)(struct memory_block *); 40 struct device dev; 41}; 42 43int arch_get_memory_phys_device(unsigned long start_pfn); 44 45/* These states are exposed to userspace as text strings in sysfs */ 46#define MEM_ONLINE (1<<0) /* exposed to userspace */ 47#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */ 48#define MEM_OFFLINE (1<<2) /* exposed to userspace */ 49#define MEM_GOING_ONLINE (1<<3) 50#define MEM_CANCEL_ONLINE (1<<4) 51#define MEM_CANCEL_OFFLINE (1<<5) 52 53struct memory_notify { 54 unsigned long start_pfn; 55 unsigned long nr_pages; 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); 114extern int register_new_memory(int, struct mem_section *); 115extern int unregister_memory_section(struct mem_section *); 116extern int memory_dev_init(void); 117extern int remove_memory_block(unsigned long, struct mem_section *, int); 118extern int memory_notify(unsigned long val, void *v); 119extern int memory_isolate_notify(unsigned long val, void *v); 120extern struct memory_block *find_memory_block_hinted(struct mem_section *, 121 struct memory_block *); 122extern struct memory_block *find_memory_block(struct mem_section *); 123#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) 124enum mem_add_context { BOOT, HOTPLUG }; 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#else 134#define hotplug_memory_notifier(fn, pri) do { } while (0) 135#endif 136 137/* 138 * 'struct memory_accessor' is a generic interface to provide 139 * in-kernel access to persistent memory such as i2c or SPI EEPROMs 140 */ 141struct memory_accessor { 142 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset, 143 size_t count); 144 ssize_t (*write)(struct memory_accessor *, const char *buf, 145 off_t offset, size_t count); 146}; 147 148/* 149 * Kernel text modification mutex, used for code patching. Users of this lock 150 * can sleep. 151 */ 152extern struct mutex text_mutex; 153 154#endif /* _LINUX_MEMORY_H_ */ 155