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-rw-r--r--include/linux/memory.h46
1 files changed, 45 insertions, 1 deletions
diff --git a/include/linux/memory.h b/include/linux/memory.h
index 97e92e8b556a..d505c12c5c77 100644
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -23,6 +23,42 @@
#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.
+ * @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;
+ 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 */
@@ -34,6 +70,8 @@ struct memory_block {
* lay at the beginning of the memory block.
*/
unsigned long nr_vmemmap_pages;
+ struct memory_group *group; /* group (if any) for this block */
+ struct list_head group_next; /* next block inside memory group */
};
int arch_get_memory_phys_device(unsigned long start_pfn);
@@ -86,7 +124,8 @@ static inline int memory_notify(unsigned long val, void *v)
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,
- unsigned long vmemmap_pages);
+ unsigned long vmemmap_pages,
+ 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);
@@ -96,6 +135,11 @@ 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);
#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
+
+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);
#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
#ifdef CONFIG_MEMORY_HOTPLUG