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