This patch changes memoryX/phys_device to symbolic link.
This phys_device always contains 0 now, and of no use.
This patch changes it to symbolic link. acpi memohotplug is changed to support
this.
When this is applied, phys_device becomes meaningful.
==
[kamezawa@casares ~]$ readlink /sys/devices/system/memory/memory10/phys_device
../../../../firmware/acpi/namespace/ACPI/_SB/LSB1/MEM2
==
I posted previous version in Feb/2006.
Several changes to acpi_memhotplug.c in these days simplified acpi part of
this patch :) This patch is against 2.6.17-rc1-mm2.
Note:
There looks no code to make symbolic link to acpi namespace now. But this patch
will not bother Patrick-san's acpi refactoring work now goes on.
(I asked him , he answerd if enough simple.)
[1/2] includes sysfs changes.
[2/2] includes acpi memhoplug changes.
Thanks,
-Kame
Now, memory device 's sysfs entry (/sys/devices/system/memory/memoryX)
has phys_device file. Now, it contains just an integer.
But it is always 0.
The purpose of phys_device is to show relationship between memory section
and physical ram device. But to show relationship, we have to maintain
a table phys_device number <-> device.
This patch changes phys_device file to symbolic link to the device.
By this, phys_device directly points to a physical device to which it
belongs to.
Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Index: linux-2.6.17-rc1-mm2/drivers/base/memory.c
===================================================================
--- linux-2.6.17-rc1-mm2.orig/drivers/base/memory.c 2006-04-10 15:48:17.000000000 +0900
+++ linux-2.6.17-rc1-mm2/drivers/base/memory.c 2006-04-10 15:50:19.000000000 +0900
@@ -252,31 +252,33 @@
return count;
}
-/*
- * phys_device is a bad name for this. What I really want
- * is a way to differentiate between memory ranges that
- * are part of physical devices that constitute
- * a complete removable unit or fru.
- * i.e. do these ranges belong to the same physical device,
- * s.t. if I offline all of these sections I can then
- * remove the physical device?
- */
-static ssize_t show_phys_device(struct sys_device *dev, char *buf)
-{
- struct memory_block *mem =
- container_of(dev, struct memory_block, sysdev);
- return sprintf(buf, "%d\n", mem->phys_device);
-}
static SYSDEV_ATTR(phys_index, 0444, show_mem_phys_index, NULL);
static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state);
-static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL);
#define mem_create_simple_file(mem, attr_name) \
sysdev_create_file(&mem->sysdev, &attr_##attr_name)
#define mem_remove_simple_file(mem, attr_name) \
sysdev_remove_file(&mem->sysdev, &attr_##attr_name)
+static int attach_phys_device(struct memory_block *mem, struct kobject *kobj)
+{
+ int ret;
+ ret = sysfs_create_link(&mem->sysdev.kobj, kobj, "phys_device");
+ if (ret)
+ return ret;
+ mem->phys_device = kobj;
+ return 0;
+}
+
+static void remove_phys_device(struct memory_block *mem)
+{
+ if (mem->phys_device) {
+ sysfs_remove_link(&mem->sysdev.kobj, "phys_device");
+ mem->phys_device = NULL;
+ }
+}
+
/*
* Block size attribute stuff
*/
@@ -330,13 +332,13 @@
#endif
/*
- * Note that phys_device is optional. It is here to allow for
- * differentiation between which *physical* devices each
- * section belongs to...
+ * kobj is a kobject of physical memory device to which this section
+ * belongs. If kobj != NULL, symbolic link to device from mem section is
+ * created
*/
static int add_memory_block(unsigned long node_id, struct mem_section *section,
- unsigned long state, int phys_device)
+ unsigned long state, struct kobject *kobj)
{
struct memory_block *mem = kzalloc(sizeof(*mem), GFP_KERNEL);
int ret = 0;
@@ -346,16 +348,17 @@
mem->phys_index = __section_nr(section);
mem->state = state;
+ mem->phys_device = NULL;
init_MUTEX(&mem->state_sem);
- mem->phys_device = phys_device;
+
ret = register_memory(mem, section, NULL);
if (!ret)
ret = mem_create_simple_file(mem, phys_index);
if (!ret)
ret = mem_create_simple_file(mem, state);
- if (!ret)
- ret = mem_create_simple_file(mem, phys_device);
+ if (!ret && kobj)
+ ret = attach_phys_device(mem, kobj);
return ret;
}
@@ -391,27 +394,54 @@
return mem;
}
-int remove_memory_block(unsigned long node_id, struct mem_section *section,
- int phys_device)
+static struct memory_block *pfn_to_memory_block(unsigned long pfn)
+{
+ struct mem_section *section;
+ section = __nr_to_section(pfn_to_section_nr(pfn));
+ return find_memory_block(section);
+}
+
+int remove_memory_block(unsigned long node_id, struct mem_section *section)
{
struct memory_block *mem;
mem = find_memory_block(section);
mem_remove_simple_file(mem, phys_index);
mem_remove_simple_file(mem, state);
- mem_remove_simple_file(mem, phys_device);
+ remove_phys_device(mem);
unregister_memory(mem, section, NULL);
return 0;
}
/*
+ * attach device's kobject to memory section.
+ * This is called after add_memory().
+ */
+int attach_device_to_memsection(u64 start_addr, u64 end_addr,
+ struct kobject *kobj)
+{
+ unsigned long pfn = start_addr >> PAGE_SHIFT;
+ unsigned long end_pfn = end_addr >> PAGE_SHIFT;
+ struct memory_block *mem;
+ int ret = 0;
+
+ for (; !ret && (pfn < end_pfn); pfn += PAGES_PER_SECTION) {
+ mem = pfn_to_memory_block(pfn);
+ if (mem)
+ ret = attach_phys_device(mem, kobj);
+ }
+ return ret;
+}
+EXPORT_SYMBOL_GPL(attach_device_to_memsection);
+
+/*
* need an interface for the VM to add new memory regions,
* but without onlining it.
*/
int register_new_memory(struct mem_section *section)
{
- return add_memory_block(0, section, MEM_OFFLINE, 0);
+ return add_memory_block(0, section, MEM_OFFLINE, NULL);
}
int unregister_memory_section(struct mem_section *section)
@@ -419,7 +449,7 @@
if (!valid_section(section))
return -EINVAL;
- return remove_memory_block(0, section, 0);
+ return remove_memory_block(0, section);
}
/*
Index: linux-2.6.17-rc1-mm2/include/linux/memory.h
===================================================================
--- linux-2.6.17-rc1-mm2.orig/include/linux/memory.h 2006-04-10 15:48:30.000000000 +0900
+++ linux-2.6.17-rc1-mm2/include/linux/memory.h 2006-04-10 15:50:19.000000000 +0900
@@ -31,7 +31,7 @@
* initialization.
*/
struct semaphore state_sem;
- int phys_device; /* to which fru does this belong? */
+ struct kobject *phys_device; /* to which kobj does this belong? */
void *hw; /* optional pointer to fw/hw data */
int (*phys_callback)(struct memory_block *);
struct sys_device sysdev;
@@ -73,7 +73,9 @@
extern int register_new_memory(struct mem_section *);
extern int unregister_memory_section(struct mem_section *);
extern int memory_dev_init(void);
-extern int remove_memory_block(unsigned long, struct mem_section *, int);
+extern int remove_memory_block(unsigned long, struct mem_section *);
+extern int attach_device_to_memsection(u64 start_addr, u64 end_addr,
+ struct kobject *kobj);
#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
-
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
