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 22 #include <asm/semaphore.h> 23 24 struct memory_block { 25 unsigned long phys_index; 26 unsigned long state; 27 /* 28 * This serializes all state change requests. It isn't 29 * held during creation because the control files are 30 * created long after the critical areas during 31 * initialization. 32 */ 33 struct semaphore state_sem; 34 int phys_device; /* to which fru does this belong? */ 35 void *hw; /* optional pointer to fw/hw data */ 36 int (*phys_callback)(struct memory_block *); 37 struct sys_device sysdev; 38 }; 39 40 /* These states are exposed to userspace as text strings in sysfs */ 41 #define MEM_ONLINE (1<<0) /* exposed to userspace */ 42 #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */ 43 #define MEM_OFFLINE (1<<2) /* exposed to userspace */ 44 45 /* 46 * All of these states are currently kernel-internal for notifying 47 * kernel components and architectures. 48 * 49 * For MEM_MAPPING_INVALID, all notifier chains with priority >0 50 * are called before pfn_to_page() becomes invalid. The priority=0 51 * entry is reserved for the function that actually makes 52 * pfn_to_page() stop working. Any notifiers that want to be called 53 * after that should have priority <0. 54 */ 55 #define MEM_MAPPING_INVALID (1<<3) 56 57 #ifndef CONFIG_MEMORY_HOTPLUG 58 static inline int memory_dev_init(void) 59 { 60 return 0; 61 } 62 static inline int register_memory_notifier(struct notifier_block *nb) 63 { 64 return 0; 65 } 66 static inline void unregister_memory_notifier(struct notifier_block *nb) 67 { 68 } 69 #else 70 extern int register_memory(struct memory_block *, struct mem_section *section, struct node *); 71 extern int register_new_memory(struct mem_section *); 72 extern int unregister_memory_section(struct mem_section *); 73 extern int memory_dev_init(void); 74 extern int register_memory_notifier(struct notifier_block *nb); 75 extern void unregister_memory_notifier(struct notifier_block *nb); 76 77 #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) 78 79 extern int invalidate_phys_mapping(unsigned long, unsigned long); 80 struct notifier_block; 81 82 extern int register_memory_notifier(struct notifier_block *nb); 83 extern void unregister_memory_notifier(struct notifier_block *nb); 84 85 extern struct sysdev_class memory_sysdev_class; 86 #endif /* CONFIG_MEMORY_HOTPLUG */ 87 88 #define hotplug_memory_notifier(fn, pri) { \ 89 static struct notifier_block fn##_mem_nb = \ 90 { .notifier_call = fn, .priority = pri }; \ 91 register_memory_notifier(&fn##_mem_nb); \ 92 } 93 94 #endif /* _LINUX_MEMORY_H_ */ 95