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 start_section_nr; 25 unsigned long end_section_nr; 26 unsigned long state; 27 int section_count; 28 29 /* 30 * This serializes all state change requests. It isn't 31 * held during creation because the control files are 32 * created long after the critical areas during 33 * initialization. 34 */ 35 struct mutex state_mutex; 36 int phys_device; /* to which fru does this belong? */ 37 void *hw; /* optional pointer to fw/hw data */ 38 int (*phys_callback)(struct memory_block *); 39 struct sys_device sysdev; 40 }; 41 42 int arch_get_memory_phys_device(unsigned long start_pfn); 43 44 /* These states are exposed to userspace as text strings in sysfs */ 45 #define MEM_ONLINE (1<<0) /* exposed to userspace */ 46 #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */ 47 #define MEM_OFFLINE (1<<2) /* exposed to userspace */ 48 #define MEM_GOING_ONLINE (1<<3) 49 #define MEM_CANCEL_ONLINE (1<<4) 50 #define MEM_CANCEL_OFFLINE (1<<5) 51 52 struct memory_notify { 53 unsigned long start_pfn; 54 unsigned long nr_pages; 55 int status_change_nid; 56 }; 57 58 /* 59 * During pageblock isolation, count the number of pages within the 60 * range [start_pfn, start_pfn + nr_pages) which are owned by code 61 * in the notifier chain. 62 */ 63 #define MEM_ISOLATE_COUNT (1<<0) 64 65 struct memory_isolate_notify { 66 unsigned long start_pfn; /* Start of range to check */ 67 unsigned int nr_pages; /* # pages in range to check */ 68 unsigned int pages_found; /* # pages owned found by callbacks */ 69 }; 70 71 struct notifier_block; 72 struct mem_section; 73 74 /* 75 * Priorities for the hotplug memory callback routines (stored in decreasing 76 * order in the callback chain) 77 */ 78 #define SLAB_CALLBACK_PRI 1 79 #define IPC_CALLBACK_PRI 10 80 81 #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE 82 static inline int memory_dev_init(void) 83 { 84 return 0; 85 } 86 static inline int register_memory_notifier(struct notifier_block *nb) 87 { 88 return 0; 89 } 90 static inline void unregister_memory_notifier(struct notifier_block *nb) 91 { 92 } 93 static inline int memory_notify(unsigned long val, void *v) 94 { 95 return 0; 96 } 97 static inline int register_memory_isolate_notifier(struct notifier_block *nb) 98 { 99 return 0; 100 } 101 static inline void unregister_memory_isolate_notifier(struct notifier_block *nb) 102 { 103 } 104 static inline int memory_isolate_notify(unsigned long val, void *v) 105 { 106 return 0; 107 } 108 #else 109 extern int register_memory_notifier(struct notifier_block *nb); 110 extern void unregister_memory_notifier(struct notifier_block *nb); 111 extern int register_memory_isolate_notifier(struct notifier_block *nb); 112 extern void unregister_memory_isolate_notifier(struct notifier_block *nb); 113 extern int register_new_memory(int, struct mem_section *); 114 extern int unregister_memory_section(struct mem_section *); 115 extern int memory_dev_init(void); 116 extern int remove_memory_block(unsigned long, struct mem_section *, int); 117 extern int memory_notify(unsigned long val, void *v); 118 extern int memory_isolate_notify(unsigned long val, void *v); 119 extern struct memory_block *find_memory_block_hinted(struct mem_section *, 120 struct memory_block *); 121 extern struct memory_block *find_memory_block(struct mem_section *); 122 #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) 123 enum mem_add_context { BOOT, HOTPLUG }; 124 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 125 126 #ifdef CONFIG_MEMORY_HOTPLUG 127 #define hotplug_memory_notifier(fn, pri) { \ 128 static __meminitdata struct notifier_block fn##_mem_nb =\ 129 { .notifier_call = fn, .priority = pri }; \ 130 register_memory_notifier(&fn##_mem_nb); \ 131 } 132 #else 133 #define hotplug_memory_notifier(fn, pri) do { } while (0) 134 #endif 135 136 /* 137 * 'struct memory_accessor' is a generic interface to provide 138 * in-kernel access to persistent memory such as i2c or SPI EEPROMs 139 */ 140 struct memory_accessor { 141 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset, 142 size_t count); 143 ssize_t (*write)(struct memory_accessor *, const char *buf, 144 off_t offset, size_t count); 145 }; 146 147 /* 148 * Kernel text modification mutex, used for code patching. Users of this lock 149 * can sleep. 150 */ 151 extern struct mutex text_mutex; 152 153 #endif /* _LINUX_MEMORY_H_ */ 154