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Diffstat (limited to 'kernel/include/linux/memory.h')
| -rw-r--r-- | kernel/include/linux/memory.h | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/kernel/include/linux/memory.h b/kernel/include/linux/memory.h new file mode 100644 index 000000000..8b8d8d123 --- /dev/null +++ b/kernel/include/linux/memory.h @@ -0,0 +1,156 @@ +/* + * include/linux/memory.h - generic memory definition + * + * This is mainly for topological representation. We define the + * basic "struct memory_block" here, which can be embedded in per-arch + * definitions or NUMA information. + * + * Basic handling of the devices is done in drivers/base/memory.c + * and system devices are handled in drivers/base/sys.c. + * + * Memory block are exported via sysfs in the class/memory/devices/ + * directory. + * + */ +#ifndef _LINUX_MEMORY_H_ +#define _LINUX_MEMORY_H_ + +#include <linux/node.h> +#include <linux/compiler.h> +#include <linux/mutex.h> +#include <linux/notifier.h> + +#define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS) + +struct memory_block { + unsigned long start_section_nr; + unsigned long end_section_nr; + unsigned long state; /* serialized by the dev->lock */ + int section_count; /* serialized by mem_sysfs_mutex */ + int online_type; /* for passing data to online routine */ + int phys_device; /* to which fru does this belong? */ + void *hw; /* optional pointer to fw/hw data */ + int (*phys_callback)(struct memory_block *); + struct device dev; +}; + +int arch_get_memory_phys_device(unsigned long start_pfn); +unsigned long memory_block_size_bytes(void); + +/* These states are exposed to userspace as text strings in sysfs */ +#define MEM_ONLINE (1<<0) /* exposed to userspace */ +#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */ +#define MEM_OFFLINE (1<<2) /* exposed to userspace */ +#define MEM_GOING_ONLINE (1<<3) +#define MEM_CANCEL_ONLINE (1<<4) +#define MEM_CANCEL_OFFLINE (1<<5) + +struct memory_notify { + unsigned long start_pfn; + unsigned long nr_pages; + int status_change_nid_normal; + int status_change_nid_high; + int status_change_nid; +}; + +/* + * During pageblock isolation, count the number of pages within the + * range [start_pfn, start_pfn + nr_pages) which are owned by code + * in the notifier chain. + */ +#define MEM_ISOLATE_COUNT (1<<0) + +struct memory_isolate_notify { + unsigned long start_pfn; /* Start of range to check */ + unsigned int nr_pages; /* # pages in range to check */ + unsigned int pages_found; /* # pages owned found by callbacks */ +}; + +struct notifier_block; +struct mem_section; + +/* + * Priorities for the hotplug memory callback routines (stored in decreasing + * order in the callback chain) + */ +#define SLAB_CALLBACK_PRI 1 +#define IPC_CALLBACK_PRI 10 + +#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE +static inline int memory_dev_init(void) +{ + return 0; +} +static inline int register_memory_notifier(struct notifier_block *nb) +{ + return 0; +} +static inline void unregister_memory_notifier(struct notifier_block *nb) +{ +} +static inline int memory_notify(unsigned long val, void *v) +{ + return 0; +} +static inline int register_memory_isolate_notifier(struct notifier_block *nb) +{ + return 0; +} +static inline void unregister_memory_isolate_notifier(struct notifier_block *nb) +{ +} +static inline int memory_isolate_notify(unsigned long val, void *v) +{ + return 0; +} +#else +extern int register_memory_notifier(struct notifier_block *nb); +extern void unregister_memory_notifier(struct notifier_block *nb); +extern int register_memory_isolate_notifier(struct notifier_block *nb); +extern void unregister_memory_isolate_notifier(struct notifier_block *nb); +extern int register_new_memory(int, struct mem_section *); +#ifdef CONFIG_MEMORY_HOTREMOVE +extern int unregister_memory_section(struct mem_section *); +#endif +extern int memory_dev_init(void); +extern int memory_notify(unsigned long val, void *v); +extern int memory_isolate_notify(unsigned long val, void *v); +extern struct memory_block *find_memory_block_hinted(struct mem_section *, + struct memory_block *); +extern struct memory_block *find_memory_block(struct mem_section *); +#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) +#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ + +#ifdef CONFIG_MEMORY_HOTPLUG +#define hotplug_memory_notifier(fn, pri) ({ \ + static __meminitdata struct notifier_block fn##_mem_nb =\ + { .notifier_call = fn, .priority = pri };\ + register_memory_notifier(&fn##_mem_nb); \ +}) +#define register_hotmemory_notifier(nb) register_memory_notifier(nb) +#define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb) +#else +#define hotplug_memory_notifier(fn, pri) ({ 0; }) +/* These aren't inline functions due to a GCC bug. */ +#define register_hotmemory_notifier(nb) ({ (void)(nb); 0; }) +#define unregister_hotmemory_notifier(nb) ({ (void)(nb); }) +#endif + +/* + * 'struct memory_accessor' is a generic interface to provide + * in-kernel access to persistent memory such as i2c or SPI EEPROMs + */ +struct memory_accessor { + ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset, + size_t count); + ssize_t (*write)(struct memory_accessor *, const char *buf, + off_t offset, size_t count); +}; + +/* + * Kernel text modification mutex, used for code patching. Users of this lock + * can sleep. + */ +extern struct mutex text_mutex; + +#endif /* _LINUX_MEMORY_H_ */ |