From d96ae5309165d9ed7c008a178238977b73595cd9 Mon Sep 17 00:00:00 2001 From: "akpm@linux-foundation.org" Date: Fri, 5 Mar 2010 13:41:58 -0800 Subject: [PATCH] memory-hotplug: create /sys/firmware/memmap entry for new memory A memmap is a directory in sysfs which includes 3 text files: start, end and type. For example: start: 0x100000 end: 0x7e7b1cff type: System RAM Interface firmware_map_add was not called explicitly. Remove it and add function firmware_map_add_hotplug as hotplug interface of memmap. Each memory entry has a memmap in sysfs, When we hot-add new memory, sysfs does not export memmap entry for it. We add a call in function add_memory to function firmware_map_add_hotplug. Add a new function add_sysfs_fw_map_entry() to create memmap entry, it will be called when initialize memmap and hot-add memory. [akpm@linux-foundation.org: un-kernedoc a no longer kerneldoc comment] Signed-off-by: Shaohui Zheng Acked-by: Andi Kleen Acked-by: Yasunori Goto Reviewed-by: Wu Fengguang Cc: Dave Hansen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/firmware/memmap.c | 57 +++++++++++++++++++++++------------- include/linux/firmware-map.h | 6 ++-- mm/memory_hotplug.c | 4 +++ 3 files changed, 43 insertions(+), 24 deletions(-) diff --git a/drivers/firmware/memmap.c b/drivers/firmware/memmap.c index 56f9234781fa..20f645743ead 100644 --- a/drivers/firmware/memmap.c +++ b/drivers/firmware/memmap.c @@ -122,29 +122,53 @@ static int firmware_map_add_entry(u64 start, u64 end, return 0; } +/* + * Add memmap entry on sysfs + */ +static int add_sysfs_fw_map_entry(struct firmware_map_entry *entry) +{ + static int map_entries_nr; + static struct kset *mmap_kset; + + if (!mmap_kset) { + mmap_kset = kset_create_and_add("memmap", NULL, firmware_kobj); + if (!mmap_kset) + return -ENOMEM; + } + + entry->kobj.kset = mmap_kset; + if (kobject_add(&entry->kobj, NULL, "%d", map_entries_nr++)) + kobject_put(&entry->kobj); + + return 0; +} + /** - * firmware_map_add() - Adds a firmware mapping entry. + * firmware_map_add_hotplug() - Adds a firmware mapping entry when we do + * memory hotplug. * @start: Start of the memory range. * @end: End of the memory range (inclusive). * @type: Type of the memory range. * - * This function uses kmalloc() for memory - * allocation. Use firmware_map_add_early() if you want to use the bootmem - * allocator. - * - * That function must be called before late_initcall. + * Adds a firmware mapping entry. This function is for memory hotplug, it is + * similar to function firmware_map_add_early(). The only difference is that + * it will create the syfs entry dynamically. * * Returns 0 on success, or -ENOMEM if no memory could be allocated. **/ -int firmware_map_add(u64 start, u64 end, const char *type) +int __meminit firmware_map_add_hotplug(u64 start, u64 end, const char *type) { struct firmware_map_entry *entry; - entry = kmalloc(sizeof(struct firmware_map_entry), GFP_ATOMIC); + entry = kzalloc(sizeof(struct firmware_map_entry), GFP_ATOMIC); if (!entry) return -ENOMEM; - return firmware_map_add_entry(start, end, type, entry); + firmware_map_add_entry(start, end, type, entry); + /* create the memmap entry */ + add_sysfs_fw_map_entry(entry); + + return 0; } /** @@ -154,7 +178,7 @@ int firmware_map_add(u64 start, u64 end, const char *type) * @type: Type of the memory range. * * Adds a firmware mapping entry. This function uses the bootmem allocator - * for memory allocation. Use firmware_map_add() if you want to use kmalloc(). + * for memory allocation. * * That function must be called before late_initcall. * @@ -214,19 +238,10 @@ static ssize_t memmap_attr_show(struct kobject *kobj, */ static int __init memmap_init(void) { - int i = 0; struct firmware_map_entry *entry; - struct kset *memmap_kset; - - memmap_kset = kset_create_and_add("memmap", NULL, firmware_kobj); - if (WARN_ON(!memmap_kset)) - return -ENOMEM; - list_for_each_entry(entry, &map_entries, list) { - entry->kobj.kset = memmap_kset; - if (kobject_add(&entry->kobj, NULL, "%d", i++)) - kobject_put(&entry->kobj); - } + list_for_each_entry(entry, &map_entries, list) + add_sysfs_fw_map_entry(entry); return 0; } diff --git a/include/linux/firmware-map.h b/include/linux/firmware-map.h index 875451f1373a..c6dcc1dfe781 100644 --- a/include/linux/firmware-map.h +++ b/include/linux/firmware-map.h @@ -24,17 +24,17 @@ */ #ifdef CONFIG_FIRMWARE_MEMMAP -int firmware_map_add(u64 start, u64 end, const char *type); int firmware_map_add_early(u64 start, u64 end, const char *type); +int firmware_map_add_hotplug(u64 start, u64 end, const char *type); #else /* CONFIG_FIRMWARE_MEMMAP */ -static inline int firmware_map_add(u64 start, u64 end, const char *type) +static inline int firmware_map_add_early(u64 start, u64 end, const char *type) { return 0; } -static inline int firmware_map_add_early(u64 start, u64 end, const char *type) +static inline int firmware_map_add_hotplug(u64 start, u64 end, const char *type) { return 0; } diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 030ce8a5bb0e..78e34e63c7b8 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -28,6 +28,7 @@ #include #include #include +#include #include @@ -523,6 +524,9 @@ int __ref add_memory(int nid, u64 start, u64 size) BUG_ON(ret); } + /* create new memmap entry */ + firmware_map_add_hotplug(start, start + size, "System RAM"); + goto out; error: -- GitLab