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Diffstat (limited to 'include/linux/memory.h')
| -rw-r--r-- | include/linux/memory.h | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/include/linux/memory.h b/include/linux/memory.h new file mode 100644 index 000000000..f53cfdaaa --- /dev/null +++ b/include/linux/memory.h @@ -0,0 +1,182 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * 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> + +#define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS) + +/** + * struct memory_group - a logical group of memory blocks + * @nid: The node id for all memory blocks inside the memory group. + * @blocks: List of all memory blocks belonging to this memory group. + * @present_kernel_pages: Present (online) memory outside ZONE_MOVABLE of this + * memory group. + * @present_movable_pages: Present (online) memory in ZONE_MOVABLE of this + * memory group. + * @is_dynamic: The memory group type: static vs. dynamic + * @s.max_pages: Valid with &memory_group.is_dynamic == false. The maximum + * number of pages we'll have in this static memory group. + * @d.unit_pages: Valid with &memory_group.is_dynamic == true. Unit in pages + * in which memory is added/removed in this dynamic memory group. + * This granularity defines the alignment of a unit in physical + * address space; it has to be at least as big as a single + * memory block. + * + * A memory group logically groups memory blocks; each memory block + * belongs to at most one memory group. A memory group corresponds to + * a memory device, such as a DIMM or a NUMA node, which spans multiple + * memory blocks and might even span multiple non-contiguous physical memory + * ranges. + * + * Modification of members after registration is serialized by memory + * hot(un)plug code. + */ +struct memory_group { + int nid; + struct list_head memory_blocks; + unsigned long present_kernel_pages; + unsigned long present_movable_pages; + bool is_dynamic; + union { + struct { + unsigned long max_pages; + } s; + struct { + unsigned long unit_pages; + } d; + }; +}; + +struct memory_block { + unsigned long start_section_nr; + unsigned long state; /* serialized by the dev->lock */ + int online_type; /* for passing data to online routine */ + int nid; /* NID for this memory block */ + /* + * The single zone of this memory block if all PFNs of this memory block + * that are System RAM (not a memory hole, not ZONE_DEVICE ranges) are + * managed by a single zone. NULL if multiple zones (including nodes) + * apply. + */ + struct zone *zone; + struct device dev; + struct vmem_altmap *altmap; + struct memory_group *group; /* group (if any) for this block */ + struct list_head group_next; /* next block inside memory group */ +#if defined(CONFIG_MEMORY_FAILURE) && defined(CONFIG_MEMORY_HOTPLUG) + atomic_long_t nr_hwpoison; +#endif +}; + +int arch_get_memory_phys_device(unsigned long start_pfn); +unsigned long memory_block_size_bytes(void); +int set_memory_block_size_order(unsigned int order); + +/* 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; +}; + +struct notifier_block; +struct mem_section; + +/* + * Priorities for the hotplug memory callback routines (stored in decreasing + * order in the callback chain) + */ +#define DEFAULT_CALLBACK_PRI 0 +#define SLAB_CALLBACK_PRI 1 +#define HMAT_CALLBACK_PRI 2 +#define MM_COMPUTE_BATCH_PRI 10 +#define CPUSET_CALLBACK_PRI 10 +#define MEMTIER_HOTPLUG_PRI 100 +#define KSM_CALLBACK_PRI 100 + +#ifndef CONFIG_MEMORY_HOTPLUG +static inline void memory_dev_init(void) +{ + return; +} +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 hotplug_memory_notifier(notifier_fn_t fn, int pri) +{ + return 0; +} +#else /* CONFIG_MEMORY_HOTPLUG */ +extern int register_memory_notifier(struct notifier_block *nb); +extern void unregister_memory_notifier(struct notifier_block *nb); +int create_memory_block_devices(unsigned long start, unsigned long size, + struct vmem_altmap *altmap, + struct memory_group *group); +void remove_memory_block_devices(unsigned long start, unsigned long size); +extern void memory_dev_init(void); +extern int memory_notify(unsigned long val, void *v); +extern struct memory_block *find_memory_block(unsigned long section_nr); +typedef int (*walk_memory_blocks_func_t)(struct memory_block *, void *); +extern int walk_memory_blocks(unsigned long start, unsigned long size, + void *arg, walk_memory_blocks_func_t func); +extern int for_each_memory_block(void *arg, walk_memory_blocks_func_t func); + +extern int memory_group_register_static(int nid, unsigned long max_pages); +extern int memory_group_register_dynamic(int nid, unsigned long unit_pages); +extern int memory_group_unregister(int mgid); +struct memory_group *memory_group_find_by_id(int mgid); +typedef int (*walk_memory_groups_func_t)(struct memory_group *, void *); +int walk_dynamic_memory_groups(int nid, walk_memory_groups_func_t func, + struct memory_group *excluded, void *arg); +#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); \ +}) + +#ifdef CONFIG_NUMA +void memory_block_add_nid(struct memory_block *mem, int nid, + enum meminit_context context); +#endif /* CONFIG_NUMA */ +#endif /* CONFIG_MEMORY_HOTPLUG */ + +/* + * Kernel text modification mutex, used for code patching. Users of this lock + * can sleep. + */ +extern struct mutex text_mutex; + +#endif /* _LINUX_MEMORY_H_ */ |