| /* |
| * debugfs ops for process ASIDs |
| * |
| * Copyright (C) 2000, 2001 Paolo Alberelli |
| * Copyright (C) 2003 - 2008 Paul Mundt |
| * Copyright (C) 2003, 2004 Richard Curnow |
| * |
| * Provides a debugfs file that lists out the ASIDs currently associated |
| * with the processes. |
| * |
| * In the SH-5 case, if the DM.PC register is examined through the debug |
| * link, this shows ASID + PC. To make use of this, the PID->ASID |
| * relationship needs to be known. This is primarily for debugging. |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| */ |
| #include <linux/init.h> |
| #include <linux/debugfs.h> |
| #include <linux/seq_file.h> |
| #include <linux/spinlock.h> |
| #include <asm/processor.h> |
| #include <asm/mmu_context.h> |
| |
| static int asids_seq_show(struct seq_file *file, void *iter) |
| { |
| struct task_struct *p; |
| |
| read_lock(&tasklist_lock); |
| |
| for_each_process(p) { |
| int pid = p->pid; |
| |
| if (unlikely(!pid)) |
| continue; |
| |
| if (p->mm) |
| seq_printf(file, "%5d : %04lx\n", pid, |
| cpu_asid(smp_processor_id(), p->mm)); |
| } |
| |
| read_unlock(&tasklist_lock); |
| |
| return 0; |
| } |
| |
| static int asids_debugfs_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, asids_seq_show, inode->i_private); |
| } |
| |
| static const struct file_operations asids_debugfs_fops = { |
| .owner = THIS_MODULE, |
| .open = asids_debugfs_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static int __init asids_debugfs_init(void) |
| { |
| struct dentry *asids_dentry; |
| |
| asids_dentry = debugfs_create_file("asids", S_IRUSR, arch_debugfs_dir, |
| NULL, &asids_debugfs_fops); |
| if (!asids_dentry) |
| return -ENOMEM; |
| |
| return PTR_ERR_OR_ZERO(asids_dentry); |
| } |
| device_initcall(asids_debugfs_init); |