mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 00:16:48 +07:00
188917e183
Some of the stuff in /proc/ppc64 such as the RTAS bits are actually useful to some 32-bit platforms. Rename the file, and create a symlink on 64-bit for backward compatibility Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
127 lines
3.0 KiB
C
127 lines
3.0 KiB
C
/*
|
|
* Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include <asm/machdep.h>
|
|
#include <asm/vdso_datapage.h>
|
|
#include <asm/rtas.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/prom.h>
|
|
|
|
#ifdef CONFIG_PPC64
|
|
|
|
static loff_t page_map_seek( struct file *file, loff_t off, int whence)
|
|
{
|
|
loff_t new;
|
|
struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
|
|
|
|
switch(whence) {
|
|
case 0:
|
|
new = off;
|
|
break;
|
|
case 1:
|
|
new = file->f_pos + off;
|
|
break;
|
|
case 2:
|
|
new = dp->size + off;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
if ( new < 0 || new > dp->size )
|
|
return -EINVAL;
|
|
return (file->f_pos = new);
|
|
}
|
|
|
|
static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes,
|
|
loff_t *ppos)
|
|
{
|
|
struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
|
|
return simple_read_from_buffer(buf, nbytes, ppos, dp->data, dp->size);
|
|
}
|
|
|
|
static int page_map_mmap( struct file *file, struct vm_area_struct *vma )
|
|
{
|
|
struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
|
|
|
|
if ((vma->vm_end - vma->vm_start) > dp->size)
|
|
return -EINVAL;
|
|
|
|
remap_pfn_range(vma, vma->vm_start, __pa(dp->data) >> PAGE_SHIFT,
|
|
dp->size, vma->vm_page_prot);
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations page_map_fops = {
|
|
.llseek = page_map_seek,
|
|
.read = page_map_read,
|
|
.mmap = page_map_mmap
|
|
};
|
|
|
|
|
|
static int __init proc_ppc64_init(void)
|
|
{
|
|
struct proc_dir_entry *pde;
|
|
|
|
pde = proc_create_data("powerpc/systemcfg", S_IFREG|S_IRUGO, NULL,
|
|
&page_map_fops, vdso_data);
|
|
if (!pde)
|
|
return 1;
|
|
pde->size = PAGE_SIZE;
|
|
|
|
return 0;
|
|
}
|
|
__initcall(proc_ppc64_init);
|
|
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
/*
|
|
* Create the ppc64 and ppc64/rtas directories early. This allows us to
|
|
* assume that they have been previously created in drivers.
|
|
*/
|
|
static int __init proc_ppc64_create(void)
|
|
{
|
|
struct proc_dir_entry *root;
|
|
|
|
root = proc_mkdir("powerpc", NULL);
|
|
if (!root)
|
|
return 1;
|
|
|
|
#ifdef CONFIG_PPC64
|
|
if (!proc_symlink("ppc64", NULL, "powerpc"))
|
|
pr_err("Failed to create link /proc/ppc64 -> /proc/powerpc\n");
|
|
#endif
|
|
|
|
if (!of_find_node_by_path("/rtas"))
|
|
return 0;
|
|
|
|
if (!proc_mkdir("rtas", root))
|
|
return 1;
|
|
|
|
if (!proc_symlink("rtas", NULL, "powerpc/rtas"))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
core_initcall(proc_ppc64_create);
|