Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 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 | |
Tim Schmielau | 8c65b4a | 2005-11-07 00:59:43 -0800 | [diff] [blame] | 57 | struct notifier_block; |
| 58 | struct mem_section; |
| 59 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 60 | #ifndef CONFIG_MEMORY_HOTPLUG |
| 61 | static inline int memory_dev_init(void) |
| 62 | { |
| 63 | return 0; |
| 64 | } |
| 65 | static inline int register_memory_notifier(struct notifier_block *nb) |
| 66 | { |
| 67 | return 0; |
| 68 | } |
| 69 | static inline void unregister_memory_notifier(struct notifier_block *nb) |
| 70 | { |
| 71 | } |
| 72 | #else |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 73 | extern int register_new_memory(struct mem_section *); |
| 74 | extern int unregister_memory_section(struct mem_section *); |
| 75 | extern int memory_dev_init(void); |
Olaf Hering | b792de3 | 2006-01-08 01:00:32 -0800 | [diff] [blame] | 76 | extern int remove_memory_block(unsigned long, struct mem_section *, int); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 77 | |
| 78 | #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) |
| 79 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 80 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 81 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 82 | |
| 83 | #define hotplug_memory_notifier(fn, pri) { \ |
| 84 | static struct notifier_block fn##_mem_nb = \ |
| 85 | { .notifier_call = fn, .priority = pri }; \ |
| 86 | register_memory_notifier(&fn##_mem_nb); \ |
| 87 | } |
| 88 | |
| 89 | #endif /* _LINUX_MEMORY_H_ */ |