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 #define MIN_MEMORY_BLOCK_SIZE (1 << SECTION_SIZE_BITS) 24 25 struct memory_block { 26 unsigned long start_section_nr; 27 unsigned long end_section_nr; 28 unsigned long state; 29 int section_count; 30 31 /* 32 * This serializes all state change requests. It isn't 33 * held during creation because the control files are 34 * created long after the critical areas during 35 * initialization. 36 */ 37 struct mutex state_mutex; 38 int phys_device; /* to which fru does this belong? */ 39 void *hw; /* optional pointer to fw/hw data */ 40 int (*phys_callback)(struct memory_block *); 41 struct sys_device sysdev; 42 }; 43 44 int arch_get_memory_phys_device(unsigned long start_pfn); 45 46 /* These states are exposed to userspace as text strings in sysfs */ 47 #define MEM_ONLINE (1<<0) /* exposed to userspace */ 48 #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */ 49 #define MEM_OFFLINE (1<<2) /* exposed to userspace */ 50 #define MEM_GOING_ONLINE (1<<3) 51 #define MEM_CANCEL_ONLINE (1<<4) 52 #define MEM_CANCEL_OFFLINE (1<<5) 53 54 struct memory_notify { 55 unsigned long start_pfn; 56 unsigned long nr_pages; 57 int status_change_nid; 58 }; 59 60 /* 61 * During pageblock isolation, count the number of pages within the 62 * range [start_pfn, start_pfn + nr_pages) which are owned by code 63 * in the notifier chain. 64 */ 65 #define MEM_ISOLATE_COUNT (1<<0) 66 67 struct memory_isolate_notify { 68 unsigned long start_pfn; /* Start of range to check */ 69 unsigned int nr_pages; /* # pages in range to check */ 70 unsigned int pages_found; /* # pages owned found by callbacks */ 71 }; 72 73 struct notifier_block; 74 struct mem_section; 75 76 /* 77 * Priorities for the hotplug memory callback routines (stored in decreasing 78 * order in the callback chain) 79 */ 80 #define SLAB_CALLBACK_PRI 1 81 #define IPC_CALLBACK_PRI 10 82 83 #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE 84 static inline int memory_dev_init(void) 85 { 86 return 0; 87 } 88 static inline int register_memory_notifier(struct notifier_block *nb) 89 { 90 return 0; 91 } 92 static inline void unregister_memory_notifier(struct notifier_block *nb) 93 { 94 } 95 static inline int memory_notify(unsigned long val, void *v) 96 { 97 return 0; 98 } 99 static inline int register_memory_isolate_notifier(struct notifier_block *nb) 100 { 101 return 0; 102 } 103 static inline void unregister_memory_isolate_notifier(struct notifier_block *nb) 104 { 105 } 106 static inline int memory_isolate_notify(unsigned long val, void *v) 107 { 108 return 0; 109 } 110 #else 111 extern int register_memory_notifier(struct notifier_block *nb); 112 extern void unregister_memory_notifier(struct notifier_block *nb); 113 extern int register_memory_isolate_notifier(struct notifier_block *nb); 114 extern void unregister_memory_isolate_notifier(struct notifier_block *nb); 115 extern int register_new_memory(int, struct mem_section *); 116 extern int unregister_memory_section(struct mem_section *); 117 extern int memory_dev_init(void); 118 extern int remove_memory_block(unsigned long, struct mem_section *, int); 119 extern int memory_notify(unsigned long val, void *v); 120 extern int memory_isolate_notify(unsigned long val, void *v); 121 extern struct memory_block *find_memory_block_hinted(struct mem_section *, 122 struct memory_block *); 123 extern struct memory_block *find_memory_block(struct mem_section *); 124 #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) 125 enum mem_add_context { BOOT, HOTPLUG }; 126 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 127 128 #ifdef CONFIG_MEMORY_HOTPLUG 129 #define hotplug_memory_notifier(fn, pri) { \ 130 static __meminitdata struct notifier_block fn##_mem_nb =\ 131 { .notifier_call = fn, .priority = pri }; \ 132 register_memory_notifier(&fn##_mem_nb); \ 133 } 134 #else 135 #define hotplug_memory_notifier(fn, pri) do { } while (0) 136 #endif 137 138 /* 139 * 'struct memory_accessor' is a generic interface to provide 140 * in-kernel access to persistent memory such as i2c or SPI EEPROMs 141 */ 142 struct memory_accessor { 143 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset, 144 size_t count); 145 ssize_t (*write)(struct memory_accessor *, const char *buf, 146 off_t offset, size_t count); 147 }; 148 149 /* 150 * Kernel text modification mutex, used for code patching. Users of this lock 151 * can sleep. 152 */ 153 extern struct mutex text_mutex; 154 155 #endif /* _LINUX_MEMORY_H_ */ 156