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a99d6fde PM |
1 | /* |
2 | * debugfs ops for process ASIDs | |
3 | * | |
4 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
5 | * Copyright (C) 2003 - 2008 Paul Mundt | |
6 | * Copyright (C) 2003, 2004 Richard Curnow | |
7 | * | |
8 | * Provides a debugfs file that lists out the ASIDs currently associated | |
9 | * with the processes. | |
10 | * | |
11 | * In the SH-5 case, if the DM.PC register is examined through the debug | |
12 | * link, this shows ASID + PC. To make use of this, the PID->ASID | |
13 | * relationship needs to be known. This is primarily for debugging. | |
14 | * | |
15 | * This file is subject to the terms and conditions of the GNU General Public | |
16 | * License. See the file "COPYING" in the main directory of this archive | |
17 | * for more details. | |
18 | */ | |
19 | #include <linux/init.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/debugfs.h> | |
22 | #include <linux/seq_file.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <asm/processor.h> | |
25 | #include <asm/mmu_context.h> | |
26 | ||
27 | static int asids_seq_show(struct seq_file *file, void *iter) | |
28 | { | |
29 | struct task_struct *p; | |
30 | ||
31 | read_lock(&tasklist_lock); | |
32 | ||
33 | for_each_process(p) { | |
34 | int pid = p->pid; | |
35 | ||
36 | if (unlikely(!pid)) | |
37 | continue; | |
38 | ||
39 | if (p->mm) | |
3a3b311c | 40 | seq_printf(file, "%5d : %04lx\n", pid, |
a99d6fde | 41 | cpu_asid(smp_processor_id(), p->mm)); |
a99d6fde PM |
42 | } |
43 | ||
44 | read_unlock(&tasklist_lock); | |
45 | ||
46 | return 0; | |
47 | } | |
48 | ||
49 | static int asids_debugfs_open(struct inode *inode, struct file *file) | |
50 | { | |
51 | return single_open(file, asids_seq_show, inode->i_private); | |
52 | } | |
53 | ||
54 | static const struct file_operations asids_debugfs_fops = { | |
55 | .owner = THIS_MODULE, | |
56 | .open = asids_debugfs_open, | |
57 | .read = seq_read, | |
58 | .llseek = seq_lseek, | |
59 | .release = single_release, | |
60 | }; | |
61 | ||
62 | static int __init asids_debugfs_init(void) | |
63 | { | |
64 | struct dentry *asids_dentry; | |
65 | ||
3f224f4e | 66 | asids_dentry = debugfs_create_file("asids", S_IRUSR, arch_debugfs_dir, |
a99d6fde PM |
67 | NULL, &asids_debugfs_fops); |
68 | if (!asids_dentry) | |
69 | return -ENOMEM; | |
a99d6fde | 70 | |
88f9802c | 71 | return PTR_ERR_OR_ZERO(asids_dentry); |
a99d6fde PM |
72 | } |
73 | module_init(asids_debugfs_init); | |
74 | ||
75 | MODULE_LICENSE("GPL v2"); |