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/sysdev.h> 19 #include <linux/node.h> 20 #include <linux/compiler.h> 21 #include <linux/mutex.h> 22 23 struct memory_block { 24 unsigned long phys_index; 25 unsigned long state; 26 /* 27 * This serializes all state change requests. It isn't 28 * held during creation because the control files are 29 * created long after the critical areas during 30 * initialization. 31 */ 32 struct mutex state_mutex; 33 int phys_device; /* to which fru does this belong? */ 34 void *hw; /* optional pointer to fw/hw data */ 35 int (*phys_callback)(struct memory_block *); 36 struct sys_device sysdev; 37 }; 38 39 /* These states are exposed to userspace as text strings in sysfs */ 40 #define MEM_ONLINE (1<<0) /* exposed to userspace */ 41 #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */ 42 #define MEM_OFFLINE (1<<2) /* exposed to userspace */ 43 #define MEM_GOING_ONLINE (1<<3) 44 #define MEM_CANCEL_ONLINE (1<<4) 45 #define MEM_CANCEL_OFFLINE (1<<5) 46 47 struct memory_notify { 48 unsigned long start_pfn; 49 unsigned long nr_pages; 50 int status_change_nid; 51 }; 52 53 /* 54 * During pageblock isolation, count the number of pages within the 55 * range [start_pfn, start_pfn + nr_pages) which are owned by code 56 * in the notifier chain. 57 */ 58 #define MEM_ISOLATE_COUNT (1<<0) 59 60 struct memory_isolate_notify { 61 unsigned long start_pfn; /* Start of range to check */ 62 unsigned int nr_pages; /* # pages in range to check */ 63 unsigned int pages_found; /* # pages owned found by callbacks */ 64 }; 65 66 struct notifier_block; 67 struct mem_section; 68 69 /* 70 * Priorities for the hotplug memory callback routines (stored in decreasing 71 * order in the callback chain) 72 */ 73 #define SLAB_CALLBACK_PRI 1 74 #define IPC_CALLBACK_PRI 10 75 76 #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE 77 static inline int memory_dev_init(void) 78 { 79 return 0; 80 } 81 static inline int register_memory_notifier(struct notifier_block *nb) 82 { 83 return 0; 84 } 85 static inline void unregister_memory_notifier(struct notifier_block *nb) 86 { 87 } 88 static inline int memory_notify(unsigned long val, void *v) 89 { 90 return 0; 91 } 92 static inline int register_memory_isolate_notifier(struct notifier_block *nb) 93 { 94 return 0; 95 } 96 static inline void unregister_memory_isolate_notifier(struct notifier_block *nb) 97 { 98 } 99 static inline int memory_isolate_notify(unsigned long val, void *v) 100 { 101 return 0; 102 } 103 #else 104 extern int register_memory_notifier(struct notifier_block *nb); 105 extern void unregister_memory_notifier(struct notifier_block *nb); 106 extern int register_memory_isolate_notifier(struct notifier_block *nb); 107 extern void unregister_memory_isolate_notifier(struct notifier_block *nb); 108 extern int register_new_memory(int, struct mem_section *); 109 extern int unregister_memory_section(struct mem_section *); 110 extern int memory_dev_init(void); 111 extern int remove_memory_block(unsigned long, struct mem_section *, int); 112 extern int memory_notify(unsigned long val, void *v); 113 extern int memory_isolate_notify(unsigned long val, void *v); 114 extern struct memory_block *find_memory_block(struct mem_section *); 115 #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) 116 enum mem_add_context { BOOT, HOTPLUG }; 117 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 118 119 #ifdef CONFIG_MEMORY_HOTPLUG 120 #define hotplug_memory_notifier(fn, pri) { \ 121 static __meminitdata struct notifier_block fn##_mem_nb =\ 122 { .notifier_call = fn, .priority = pri }; \ 123 register_memory_notifier(&fn##_mem_nb); \ 124 } 125 #else 126 #define hotplug_memory_notifier(fn, pri) do { } while (0) 127 #endif 128 129 /* 130 * 'struct memory_accessor' is a generic interface to provide 131 * in-kernel access to persistent memory such as i2c or SPI EEPROMs 132 */ 133 struct memory_accessor { 134 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset, 135 size_t count); 136 ssize_t (*write)(struct memory_accessor *, const char *buf, 137 off_t offset, size_t count); 138 }; 139 140 /* 141 * Kernel text modification mutex, used for code patching. Users of this lock 142 * can sleep. 143 */ 144 extern struct mutex text_mutex; 145 146 #endif /* _LINUX_MEMORY_H_ */ 147