提交 d96ae530 编写于 作者: A akpm@linux-foundation.org 提交者: Linus Torvalds

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: NShaohui Zheng <shaohui.zheng@intel.com>
Acked-by: NAndi Kleen <ak@linux.intel.com>
Acked-by: NYasunori Goto <y-goto@jp.fujitsu.com>
Reviewed-by: NWu Fengguang <fengguang.wu@intel.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 9d8cebd4
......@@ -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;
}
......
......@@ -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;
}
......
......@@ -28,6 +28,7 @@
#include <linux/pfn.h>
#include <linux/suspend.h>
#include <linux/mm_inline.h>
#include <linux/firmware-map.h>
#include <asm/tlbflush.h>
......@@ -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:
......
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