diff options
Diffstat (limited to 'drivers/base/node.c')
| -rw-r--r-- | drivers/base/node.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/drivers/base/node.c b/drivers/base/node.c index 91636cd8b6c..43fa90b837e 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -6,6 +6,7 @@ #include <linux/module.h> #include <linux/init.h> #include <linux/mm.h> +#include <linux/memory.h> #include <linux/node.h> #include <linux/hugetlb.h> #include <linux/cpumask.h> @@ -248,6 +249,105 @@ int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) return 0; } +#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE +#define page_initialized(page) (page->lru.next) + +static int get_nid_for_pfn(unsigned long pfn) +{ + struct page *page; + + if (!pfn_valid_within(pfn)) + return -1; + page = pfn_to_page(pfn); + if (!page_initialized(page)) + return -1; + return pfn_to_nid(pfn); +} + +/* register memory section under specified node if it spans that node */ +int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) +{ + unsigned long pfn, sect_start_pfn, sect_end_pfn; + + if (!mem_blk) + return -EFAULT; + if (!node_online(nid)) + return 0; + sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); + sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; + for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { + int page_nid; + + page_nid = get_nid_for_pfn(pfn); + if (page_nid < 0) + continue; + if (page_nid != nid) + continue; + return sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj, + &mem_blk->sysdev.kobj, + kobject_name(&mem_blk->sysdev.kobj)); + } + /* mem section does not span the specified node */ + return 0; +} + +/* unregister memory section under all nodes that it spans */ +int unregister_mem_sect_under_nodes(struct memory_block *mem_blk) +{ + nodemask_t unlinked_nodes; + unsigned long pfn, sect_start_pfn, sect_end_pfn; + + if (!mem_blk) + return -EFAULT; + nodes_clear(unlinked_nodes); + sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); + sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; + for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { + unsigned int nid; + + nid = get_nid_for_pfn(pfn); + if (nid < 0) + continue; + if (!node_online(nid)) + continue; + if (node_test_and_set(nid, unlinked_nodes)) + continue; + sysfs_remove_link(&node_devices[nid].sysdev.kobj, + kobject_name(&mem_blk->sysdev.kobj)); + } + return 0; +} + +static int link_mem_sections(int nid) +{ + unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; + unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; + unsigned long pfn; + int err = 0; + + for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { + unsigned long section_nr = pfn_to_section_nr(pfn); + struct mem_section *mem_sect; + struct memory_block *mem_blk; + int ret; + + if (!present_section_nr(section_nr)) + continue; + mem_sect = __nr_to_section(section_nr); + mem_blk = find_memory_block(mem_sect); + ret = register_mem_sect_under_node(mem_blk, nid); + if (!err) + err = ret; + + /* discard ref obtained in find_memory_block() */ + kobject_put(&mem_blk->sysdev.kobj); + } + return err; +} +#else +static int link_mem_sections(int nid) { return 0; } +#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ + int register_one_node(int nid) { int error = 0; @@ -267,6 +367,9 @@ int register_one_node(int nid) if (cpu_to_node(cpu) == nid) register_cpu_under_node(cpu, nid); } + + /* link memory sections under this node */ + error = link_mem_sections(nid); } return error; |