diff options
Diffstat (limited to 'include/linux/memory_hotplug.h')
| -rw-r--r-- | include/linux/memory_hotplug.h | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h new file mode 100644 index 000000000..6ffa0ac7f --- /dev/null +++ b/include/linux/memory_hotplug.h @@ -0,0 +1,279 @@ +#ifndef __LINUX_MEMORY_HOTPLUG_H +#define __LINUX_MEMORY_HOTPLUG_H + +#include <linux/mmzone.h> +#include <linux/spinlock.h> +#include <linux/notifier.h> +#include <linux/bug.h> + +struct page; +struct zone; +struct pglist_data; +struct mem_section; +struct memory_block; + +#ifdef CONFIG_MEMORY_HOTPLUG + +/* + * Types for free bootmem stored in page->lru.next. These have to be in + * some random range in unsigned long space for debugging purposes. + */ +enum { + MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, + SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, + MIX_SECTION_INFO, + NODE_INFO, + MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, +}; + +/* Types for control the zone type of onlined and offlined memory */ +enum { + MMOP_OFFLINE = -1, + MMOP_ONLINE_KEEP, + MMOP_ONLINE_KERNEL, + MMOP_ONLINE_MOVABLE, +}; + +/* + * pgdat resizing functions + */ +static inline +void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) +{ + spin_lock_irqsave(&pgdat->node_size_lock, *flags); +} +static inline +void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) +{ + spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); +} +static inline +void pgdat_resize_init(struct pglist_data *pgdat) +{ + spin_lock_init(&pgdat->node_size_lock); +} +/* + * Zone resizing functions + * + * Note: any attempt to resize a zone should has pgdat_resize_lock() + * zone_span_writelock() both held. This ensure the size of a zone + * can't be changed while pgdat_resize_lock() held. + */ +static inline unsigned zone_span_seqbegin(struct zone *zone) +{ + return read_seqbegin(&zone->span_seqlock); +} +static inline int zone_span_seqretry(struct zone *zone, unsigned iv) +{ + return read_seqretry(&zone->span_seqlock, iv); +} +static inline void zone_span_writelock(struct zone *zone) +{ + write_seqlock(&zone->span_seqlock); +} +static inline void zone_span_writeunlock(struct zone *zone) +{ + write_sequnlock(&zone->span_seqlock); +} +static inline void zone_seqlock_init(struct zone *zone) +{ + seqlock_init(&zone->span_seqlock); +} +extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); +extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); +extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); +/* VM interface that may be used by firmware interface */ +extern int online_pages(unsigned long, unsigned long, int); +extern int test_pages_in_a_zone(unsigned long, unsigned long); +extern void __offline_isolated_pages(unsigned long, unsigned long); + +typedef void (*online_page_callback_t)(struct page *page); + +extern int set_online_page_callback(online_page_callback_t callback); +extern int restore_online_page_callback(online_page_callback_t callback); + +extern void __online_page_set_limits(struct page *page); +extern void __online_page_increment_counters(struct page *page); +extern void __online_page_free(struct page *page); + +extern int try_online_node(int nid); + +#ifdef CONFIG_MEMORY_HOTREMOVE +extern bool is_pageblock_removable_nolock(struct page *page); +extern int arch_remove_memory(u64 start, u64 size); +extern int __remove_pages(struct zone *zone, unsigned long start_pfn, + unsigned long nr_pages); +#endif /* CONFIG_MEMORY_HOTREMOVE */ + +/* reasonably generic interface to expand the physical pages in a zone */ +extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, + unsigned long nr_pages); + +#ifdef CONFIG_NUMA +extern int memory_add_physaddr_to_nid(u64 start); +#else +static inline int memory_add_physaddr_to_nid(u64 start) +{ + return 0; +} +#endif + +#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION +/* + * For supporting node-hotadd, we have to allocate a new pgdat. + * + * If an arch has generic style NODE_DATA(), + * node_data[nid] = kzalloc() works well. But it depends on the architecture. + * + * In general, generic_alloc_nodedata() is used. + * Now, arch_free_nodedata() is just defined for error path of node_hot_add. + * + */ +extern pg_data_t *arch_alloc_nodedata(int nid); +extern void arch_free_nodedata(pg_data_t *pgdat); +extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); + +#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ + +#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) +#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) + +#ifdef CONFIG_NUMA +/* + * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. + * XXX: kmalloc_node() can't work well to get new node's memory at this time. + * Because, pgdat for the new node is not allocated/initialized yet itself. + * To use new node's memory, more consideration will be necessary. + */ +#define generic_alloc_nodedata(nid) \ +({ \ + kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ +}) +/* + * This definition is just for error path in node hotadd. + * For node hotremove, we have to replace this. + */ +#define generic_free_nodedata(pgdat) kfree(pgdat) + +extern pg_data_t *node_data[]; +static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) +{ + node_data[nid] = pgdat; +} + +#else /* !CONFIG_NUMA */ + +/* never called */ +static inline pg_data_t *generic_alloc_nodedata(int nid) +{ + BUG(); + return NULL; +} +static inline void generic_free_nodedata(pg_data_t *pgdat) +{ +} +static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) +{ +} +#endif /* CONFIG_NUMA */ +#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ + +#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE +extern void register_page_bootmem_info_node(struct pglist_data *pgdat); +#else +static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) +{ +} +#endif +extern void put_page_bootmem(struct page *page); +extern void get_page_bootmem(unsigned long ingo, struct page *page, + unsigned long type); + +void get_online_mems(void); +void put_online_mems(void); + +void mem_hotplug_begin(void); +void mem_hotplug_done(void); + +#else /* ! CONFIG_MEMORY_HOTPLUG */ +/* + * Stub functions for when hotplug is off + */ +static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} +static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} +static inline void pgdat_resize_init(struct pglist_data *pgdat) {} + +static inline unsigned zone_span_seqbegin(struct zone *zone) +{ + return 0; +} +static inline int zone_span_seqretry(struct zone *zone, unsigned iv) +{ + return 0; +} +static inline void zone_span_writelock(struct zone *zone) {} +static inline void zone_span_writeunlock(struct zone *zone) {} +static inline void zone_seqlock_init(struct zone *zone) {} + +static inline int mhp_notimplemented(const char *func) +{ + printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); + dump_stack(); + return -ENOSYS; +} + +static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) +{ +} + +static inline int try_online_node(int nid) +{ + return 0; +} + +static inline void get_online_mems(void) {} +static inline void put_online_mems(void) {} + +static inline void mem_hotplug_begin(void) {} +static inline void mem_hotplug_done(void) {} + +#endif /* ! CONFIG_MEMORY_HOTPLUG */ + +#ifdef CONFIG_MEMORY_HOTREMOVE + +extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); +extern void try_offline_node(int nid); +extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); +extern void remove_memory(int nid, u64 start, u64 size); + +#else +static inline int is_mem_section_removable(unsigned long pfn, + unsigned long nr_pages) +{ + return 0; +} + +static inline void try_offline_node(int nid) {} + +static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) +{ + return -EINVAL; +} + +static inline void remove_memory(int nid, u64 start, u64 size) {} +#endif /* CONFIG_MEMORY_HOTREMOVE */ + +extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, + void *arg, int (*func)(struct memory_block *, void *)); +extern int add_memory(int nid, u64 start, u64 size); +extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default); +extern int arch_add_memory(int nid, u64 start, u64 size); +extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); +extern bool is_memblock_offlined(struct memory_block *mem); +extern void remove_memory(int nid, u64 start, u64 size); +extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn); +extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); +extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, + unsigned long pnum); + +#endif /* __LINUX_MEMORY_HOTPLUG_H */ |