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https://github.com/edk2-porting/linux-next.git
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667471386d
Use proc_create()/proc_create_data() to make sure that ->proc_fops and ->data be setup before gluing PDE to main tree. Add correct ->owner to proc_fops to fix reading/module unloading race. Signed-off-by: Denis V. Lunev <den@openvz.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/*
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* Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/proc_fs.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <asm/machdep.h>
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#include <asm/vdso_datapage.h>
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#include <asm/rtas.h>
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#include <asm/uaccess.h>
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#include <asm/prom.h>
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static loff_t page_map_seek( struct file *file, loff_t off, int whence);
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static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes,
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loff_t *ppos);
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static int page_map_mmap( struct file *file, struct vm_area_struct *vma );
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static const struct file_operations page_map_fops = {
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.llseek = page_map_seek,
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.read = page_map_read,
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.mmap = page_map_mmap
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};
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/*
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* Create the ppc64 and ppc64/rtas directories early. This allows us to
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* assume that they have been previously created in drivers.
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*/
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static int __init proc_ppc64_create(void)
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{
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struct proc_dir_entry *root;
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root = proc_mkdir("ppc64", NULL);
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if (!root)
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return 1;
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if (!of_find_node_by_path("/rtas"))
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return 0;
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if (!proc_mkdir("rtas", root))
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return 1;
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if (!proc_symlink("rtas", NULL, "ppc64/rtas"))
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return 1;
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return 0;
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}
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core_initcall(proc_ppc64_create);
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static int __init proc_ppc64_init(void)
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{
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struct proc_dir_entry *pde;
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pde = proc_create_data("ppc64/systemcfg", S_IFREG|S_IRUGO, NULL,
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&page_map_fops, vdso_data);
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if (!pde)
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return 1;
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pde->size = PAGE_SIZE;
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return 0;
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}
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__initcall(proc_ppc64_init);
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static loff_t page_map_seek( struct file *file, loff_t off, int whence)
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{
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loff_t new;
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struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
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switch(whence) {
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case 0:
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new = off;
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break;
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case 1:
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new = file->f_pos + off;
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break;
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case 2:
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new = dp->size + off;
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break;
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default:
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return -EINVAL;
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}
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if ( new < 0 || new > dp->size )
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return -EINVAL;
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return (file->f_pos = new);
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}
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static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes,
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loff_t *ppos)
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{
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struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
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return simple_read_from_buffer(buf, nbytes, ppos, dp->data, dp->size);
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}
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static int page_map_mmap( struct file *file, struct vm_area_struct *vma )
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{
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struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
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if ((vma->vm_end - vma->vm_start) > dp->size)
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return -EINVAL;
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remap_pfn_range(vma, vma->vm_start, __pa(dp->data) >> PAGE_SHIFT,
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dp->size, vma->vm_page_prot);
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return 0;
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}
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