/include/linux/memory.h
C++ Header | 148 lines | 96 code | 14 blank | 38 comment | 1 complexity | aa9488987b84d2ab0edd40242d1241d6 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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#include <linux/mutex.h> 22 23struct memory_block { 24 unsigned long phys_index; 25 unsigned long state; 26 /* 27 * This serializes all state change requests. It isn't 28 * held during creation because the control files are 29 * created long after the critical areas during 30 * initialization. 31 */ 32 struct mutex state_mutex; 33 int phys_device; /* to which fru does this belong? */ 34 void *hw; /* optional pointer to fw/hw data */ 35 int (*phys_callback)(struct memory_block *); 36 struct sys_device sysdev; 37}; 38 39int arch_get_memory_phys_device(unsigned long start_pfn); 40 41/* These states are exposed to userspace as text strings in sysfs */ 42#define MEM_ONLINE (1<<0) /* exposed to userspace */ 43#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */ 44#define MEM_OFFLINE (1<<2) /* exposed to userspace */ 45#define MEM_GOING_ONLINE (1<<3) 46#define MEM_CANCEL_ONLINE (1<<4) 47#define MEM_CANCEL_OFFLINE (1<<5) 48 49struct memory_notify { 50 unsigned long start_pfn; 51 unsigned long nr_pages; 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 62struct 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 68struct notifier_block; 69struct 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 79static inline int memory_dev_init(void) 80{ 81 return 0; 82} 83static inline int register_memory_notifier(struct notifier_block *nb) 84{ 85 return 0; 86} 87static inline void unregister_memory_notifier(struct notifier_block *nb) 88{ 89} 90static inline int memory_notify(unsigned long val, void *v) 91{ 92 return 0; 93} 94static inline int register_memory_isolate_notifier(struct notifier_block *nb) 95{ 96 return 0; 97} 98static inline void unregister_memory_isolate_notifier(struct notifier_block *nb) 99{ 100} 101static inline int memory_isolate_notify(unsigned long val, void *v) 102{ 103 return 0; 104} 105#else 106extern int register_memory_notifier(struct notifier_block *nb); 107extern void unregister_memory_notifier(struct notifier_block *nb); 108extern int register_memory_isolate_notifier(struct notifier_block *nb); 109extern void unregister_memory_isolate_notifier(struct notifier_block *nb); 110extern int register_new_memory(int, struct mem_section *); 111extern int unregister_memory_section(struct mem_section *); 112extern int memory_dev_init(void); 113extern int remove_memory_block(unsigned long, struct mem_section *, int); 114extern int memory_notify(unsigned long val, void *v); 115extern int memory_isolate_notify(unsigned long val, void *v); 116extern struct memory_block *find_memory_block(struct mem_section *); 117#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) 118enum mem_add_context { BOOT, HOTPLUG }; 119#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 120 121#ifdef CONFIG_MEMORY_HOTPLUG 122#define hotplug_memory_notifier(fn, pri) { \ 123 static __meminitdata struct notifier_block fn##_mem_nb =\ 124 { .notifier_call = fn, .priority = pri }; \ 125 register_memory_notifier(&fn##_mem_nb); \ 126} 127#else 128#define hotplug_memory_notifier(fn, pri) do { } while (0) 129#endif 130 131/* 132 * 'struct memory_accessor' is a generic interface to provide 133 * in-kernel access to persistent memory such as i2c or SPI EEPROMs 134 */ 135struct memory_accessor { 136 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset, 137 size_t count); 138 ssize_t (*write)(struct memory_accessor *, const char *buf, 139 off_t offset, size_t count); 140}; 141 142/* 143 * Kernel text modification mutex, used for code patching. Users of this lock 144 * can sleep. 145 */ 146extern struct mutex text_mutex; 147 148#endif /* _LINUX_MEMORY_H_ */