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; 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 device dev; 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_normal; 58 int status_change_nid_high; 59 int status_change_nid; 60 }; 61 62 /* 63 * During pageblock isolation, count the number of pages within the 64 * range [start_pfn, start_pfn + nr_pages) which are owned by code 65 * in the notifier chain. 66 */ 67 #define MEM_ISOLATE_COUNT (1<<0) 68 69 struct memory_isolate_notify { 70 unsigned long start_pfn; /* Start of range to check */ 71 unsigned int nr_pages; /* # pages in range to check */ 72 unsigned int pages_found; /* # pages owned found by callbacks */ 73 }; 74 75 struct notifier_block; 76 struct mem_section; 77 78 /* 79 * Priorities for the hotplug memory callback routines (stored in decreasing 80 * order in the callback chain) 81 */ 82 #define SLAB_CALLBACK_PRI 1 83 #define IPC_CALLBACK_PRI 10 84 85 #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE 86 static inline int memory_dev_init(void) 87 { 88 return 0; 89 } 90 static inline int register_memory_notifier(struct notifier_block *nb) 91 { 92 return 0; 93 } 94 static inline void unregister_memory_notifier(struct notifier_block *nb) 95 { 96 } 97 static inline int memory_notify(unsigned long val, void *v) 98 { 99 return 0; 100 } 101 static inline int register_memory_isolate_notifier(struct notifier_block *nb) 102 { 103 return 0; 104 } 105 static inline void unregister_memory_isolate_notifier(struct notifier_block *nb) 106 { 107 } 108 static inline int memory_isolate_notify(unsigned long val, void *v) 109 { 110 return 0; 111 } 112 #else 113 extern int register_memory_notifier(struct notifier_block *nb); 114 extern void unregister_memory_notifier(struct notifier_block *nb); 115 extern int register_memory_isolate_notifier(struct notifier_block *nb); 116 extern void unregister_memory_isolate_notifier(struct notifier_block *nb); 117 extern int register_new_memory(int, struct mem_section *); 118 #ifdef CONFIG_MEMORY_HOTREMOVE 119 extern int unregister_memory_section(struct mem_section *); 120 #endif 121 extern int memory_dev_init(void); 122 extern int memory_notify(unsigned long val, void *v); 123 extern int memory_isolate_notify(unsigned long val, void *v); 124 extern struct memory_block *find_memory_block_hinted(struct mem_section *, 125 struct memory_block *); 126 extern struct memory_block *find_memory_block(struct mem_section *); 127 #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) 128 enum mem_add_context { BOOT, HOTPLUG }; 129 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 130 131 #ifdef CONFIG_MEMORY_HOTPLUG 132 #define hotplug_memory_notifier(fn, pri) ({ \ 133 static __meminitdata struct notifier_block fn##_mem_nb =\ 134 { .notifier_call = fn, .priority = pri };\ 135 register_memory_notifier(&fn##_mem_nb); \ 136 }) 137 #define register_hotmemory_notifier(nb) register_memory_notifier(nb) 138 #define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb) 139 #else 140 #define hotplug_memory_notifier(fn, pri) ({ 0; }) 141 /* These aren't inline functions due to a GCC bug. */ 142 #define register_hotmemory_notifier(nb) ({ (void)(nb); 0; }) 143 #define unregister_hotmemory_notifier(nb) ({ (void)(nb); }) 144 #endif 145 146 /* 147 * 'struct memory_accessor' is a generic interface to provide 148 * in-kernel access to persistent memory such as i2c or SPI EEPROMs 149 */ 150 struct memory_accessor { 151 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset, 152 size_t count); 153 ssize_t (*write)(struct memory_accessor *, const char *buf, 154 off_t offset, size_t count); 155 }; 156 157 /* 158 * Kernel text modification mutex, used for code patching. Users of this lock 159 * can sleep. 160 */ 161 extern struct mutex text_mutex; 162 163 #endif /* _LINUX_MEMORY_H_ */ 164