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