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[SPARC64]: Allow userspace to get at the machine description.

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Like the OF device tree, it's useful to let userland get
at the machine description so it can pretty print the
graph etc.

The implementation is a simple MISC device with a read method.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2007-08-15 21:02:23 -07:00
parent 70b0e7a919
commit 0fdb7f96d8
1 changed files with 38 additions and 0 deletions
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38
arch/sparc64/kernel/mdesc.c
View file

@ -9,6 +9,7 @@
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <asm/hypervisor.h>
#include <asm/mdesc.h>
@ -836,6 +837,43 @@ void __devinit mdesc_fill_in_cpu_data(cpumask_t mask)
mdesc_release(hp);
}
static ssize_t mdesc_read(struct file *file, char __user *buf,
size_t len, loff_t *offp)
{
struct mdesc_handle *hp = mdesc_grab();
int err;
if (!hp)
return -ENODEV;
err = hp->handle_size;
if (len < hp->handle_size)
err = -EMSGSIZE;
else if (copy_to_user(buf, &hp->mdesc, hp->handle_size))
err = -EFAULT;
mdesc_release(hp);
return err;
}
static const struct file_operations mdesc_fops = {
.read = mdesc_read,
.owner = THIS_MODULE,
};
static struct miscdevice mdesc_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "mdesc",
.fops = &mdesc_fops,
};
static int __init mdesc_misc_init(void)
{
return misc_register(&mdesc_misc);
}
__initcall(mdesc_misc_init);
void __init sun4v_mdesc_init(void)
{
struct mdesc_handle *hp;