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 #include <linux/notifier.h> 22 23 #define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS) 24 25 struct memory_block { 26 unsigned long start_section_nr; 27 unsigned long end_section_nr; 28 unsigned long state; /* serialized by the dev->lock */ 29 int section_count; /* serialized by mem_sysfs_mutex */ 30 int online_type; /* for passing data to online routine */ 31 int phys_device; /* to which fru does this belong? */ 32 void *hw; /* optional pointer to fw/hw data */ 33 int (*phys_callback)(struct memory_block *); 34 struct device dev; 35 }; 36 37 int arch_get_memory_phys_device(unsigned long start_pfn); 38 39 /* These states are exposed to userspace as text strings in sysfs */ 40 #define MEM_ONLINE (1<<0) /* exposed to userspace */ 41 #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */ 42 #define MEM_OFFLINE (1<<2) /* exposed to userspace */ 43 #define MEM_GOING_ONLINE (1<<3) 44 #define MEM_CANCEL_ONLINE (1<<4) 45 #define MEM_CANCEL_OFFLINE (1<<5) 46 47 struct memory_notify { 48 unsigned long start_pfn; 49 unsigned long nr_pages; 50 int status_change_nid_normal; 51 int status_change_nid_high; 52 int status_change_nid; 53 }; 54 55 /* 56 * During pageblock isolation, count the number of pages within the 57 * range [start_pfn, start_pfn + nr_pages) which are owned by code 58 * in the notifier chain. 59 */ 60 #define MEM_ISOLATE_COUNT (1<<0) 61 62 struct memory_isolate_notify { 63 unsigned long start_pfn; /* Start of range to check */ 64 unsigned int nr_pages; /* # pages in range to check */ 65 unsigned int pages_found; /* # pages owned found by callbacks */ 66 }; 67 68 struct notifier_block; 69 struct mem_section; 70 71 /* 72 * Priorities for the hotplug memory callback routines (stored in decreasing 73 * order in the callback chain) 74 */ 75 #define SLAB_CALLBACK_PRI 1 76 #define IPC_CALLBACK_PRI 10 77 78 #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE 79 static inline int memory_dev_init(void) 80 { 81 return 0; 82 } 83 static inline int register_memory_notifier(struct notifier_block *nb) 84 { 85 return 0; 86 } 87 static inline void unregister_memory_notifier(struct notifier_block *nb) 88 { 89 } 90 static inline int memory_notify(unsigned long val, void *v) 91 { 92 return 0; 93 } 94 static inline int register_memory_isolate_notifier(struct notifier_block *nb) 95 { 96 return 0; 97 } 98 static inline void unregister_memory_isolate_notifier(struct notifier_block *nb) 99 { 100 } 101 static inline int memory_isolate_notify(unsigned long val, void *v) 102 { 103 return 0; 104 } 105 #else 106 extern int register_memory_notifier(struct notifier_block *nb); 107 extern void unregister_memory_notifier(struct notifier_block *nb); 108 extern int register_memory_isolate_notifier(struct notifier_block *nb); 109 extern void unregister_memory_isolate_notifier(struct notifier_block *nb); 110 extern int register_new_memory(int, struct mem_section *); 111 #ifdef CONFIG_MEMORY_HOTREMOVE 112 extern int unregister_memory_section(struct mem_section *); 113 #endif 114 extern int memory_dev_init(void); 115 extern int memory_notify(unsigned long val, void *v); 116 extern int memory_isolate_notify(unsigned long val, void *v); 117 extern struct memory_block *find_memory_block_hinted(struct mem_section *, 118 struct memory_block *); 119 extern struct memory_block *find_memory_block(struct mem_section *); 120 #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) 121 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 122 123 #ifdef CONFIG_MEMORY_HOTPLUG 124 #define hotplug_memory_notifier(fn, pri) ({ \ 125 static __meminitdata struct notifier_block fn##_mem_nb =\ 126 { .notifier_call = fn, .priority = pri };\ 127 register_memory_notifier(&fn##_mem_nb); \ 128 }) 129 #define register_hotmemory_notifier(nb) register_memory_notifier(nb) 130 #define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb) 131 #else 132 #define hotplug_memory_notifier(fn, pri) ({ 0; }) 133 /* These aren't inline functions due to a GCC bug. */ 134 #define register_hotmemory_notifier(nb) ({ (void)(nb); 0; }) 135 #define unregister_hotmemory_notifier(nb) ({ (void)(nb); }) 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