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 (1UL << SECTION_SIZE_BITS) 23 24 struct 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 43 int 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 53 struct memory_notify { 54 unsigned long start_pfn; 55 unsigned long nr_pages; 56 int status_change_nid_normal; 57 int status_change_nid_high; 58 int status_change_nid; 59 }; 60 61 /* 62 * During pageblock isolation, count the number of pages within the 63 * range [start_pfn, start_pfn + nr_pages) which are owned by code 64 * in the notifier chain. 65 */ 66 #define MEM_ISOLATE_COUNT (1<<0) 67 68 struct memory_isolate_notify { 69 unsigned long start_pfn; /* Start of range to check */ 70 unsigned int nr_pages; /* # pages in range to check */ 71 unsigned int pages_found; /* # pages owned found by callbacks */ 72 }; 73 74 struct notifier_block; 75 struct mem_section; 76 77 /* 78 * Priorities for the hotplug memory callback routines (stored in decreasing 79 * order in the callback chain) 80 */ 81 #define SLAB_CALLBACK_PRI 1 82 #define IPC_CALLBACK_PRI 10 83 84 #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE 85 static inline int memory_dev_init(void) 86 { 87 return 0; 88 } 89 static inline int register_memory_notifier(struct notifier_block *nb) 90 { 91 return 0; 92 } 93 static inline void unregister_memory_notifier(struct notifier_block *nb) 94 { 95 } 96 static inline int memory_notify(unsigned long val, void *v) 97 { 98 return 0; 99 } 100 static inline int register_memory_isolate_notifier(struct notifier_block *nb) 101 { 102 return 0; 103 } 104 static inline void unregister_memory_isolate_notifier(struct notifier_block *nb) 105 { 106 } 107 static inline int memory_isolate_notify(unsigned long val, void *v) 108 { 109 return 0; 110 } 111 #else 112 extern int register_memory_notifier(struct notifier_block *nb); 113 extern void unregister_memory_notifier(struct notifier_block *nb); 114 extern int register_memory_isolate_notifier(struct notifier_block *nb); 115 extern void unregister_memory_isolate_notifier(struct notifier_block *nb); 116 extern int register_new_memory(int, struct mem_section *); 117 extern int unregister_memory_section(struct mem_section *); 118 extern int memory_dev_init(void); 119 extern int remove_memory_block(unsigned long, struct mem_section *, int); 120 extern int memory_notify(unsigned long val, void *v); 121 extern int memory_isolate_notify(unsigned long val, void *v); 122 extern struct memory_block *find_memory_block_hinted(struct mem_section *, 123 struct memory_block *); 124 extern struct memory_block *find_memory_block(struct mem_section *); 125 #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) 126 enum mem_add_context { BOOT, HOTPLUG }; 127 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 128 129 #ifdef CONFIG_MEMORY_HOTPLUG 130 #define hotplug_memory_notifier(fn, pri) { \ 131 static __meminitdata struct notifier_block fn##_mem_nb =\ 132 { .notifier_call = fn, .priority = pri }; \ 133 register_memory_notifier(&fn##_mem_nb); \ 134 } 135 #else 136 #define hotplug_memory_notifier(fn, pri) do { } while (0) 137 #endif 138 139 /* 140 * 'struct memory_accessor' is a generic interface to provide 141 * in-kernel access to persistent memory such as i2c or SPI EEPROMs 142 */ 143 struct memory_accessor { 144 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset, 145 size_t count); 146 ssize_t (*write)(struct memory_accessor *, const char *buf, 147 off_t offset, size_t count); 148 }; 149 150 /* 151 * Kernel text modification mutex, used for code patching. Users of this lock 152 * can sleep. 153 */ 154 extern struct mutex text_mutex; 155 156 #endif /* _LINUX_MEMORY_H_ */ 157