Merge tag 'staging-4.1-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[sfrench/cifs-2.6.git] / drivers / iommu / omap-iommu-debug.c
1 /*
2  * omap iommu: debugfs interface
3  *
4  * Copyright (C) 2008-2009 Nokia Corporation
5  *
6  * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12
13 #include <linux/err.h>
14 #include <linux/io.h>
15 #include <linux/slab.h>
16 #include <linux/uaccess.h>
17 #include <linux/debugfs.h>
18 #include <linux/platform_data/iommu-omap.h>
19
20 #include "omap-iopgtable.h"
21 #include "omap-iommu.h"
22
23 static DEFINE_MUTEX(iommu_debug_lock);
24
25 static struct dentry *iommu_debug_root;
26
27 static inline bool is_omap_iommu_detached(struct omap_iommu *obj)
28 {
29         return !obj->domain;
30 }
31
32 static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
33                                size_t count, loff_t *ppos)
34 {
35         struct omap_iommu *obj = file->private_data;
36         char *p, *buf;
37         ssize_t bytes;
38
39         if (is_omap_iommu_detached(obj))
40                 return -EPERM;
41
42         buf = kmalloc(count, GFP_KERNEL);
43         if (!buf)
44                 return -ENOMEM;
45         p = buf;
46
47         mutex_lock(&iommu_debug_lock);
48
49         bytes = omap_iommu_dump_ctx(obj, p, count);
50         bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes);
51
52         mutex_unlock(&iommu_debug_lock);
53         kfree(buf);
54
55         return bytes;
56 }
57
58 static ssize_t debug_read_tlb(struct file *file, char __user *userbuf,
59                               size_t count, loff_t *ppos)
60 {
61         struct omap_iommu *obj = file->private_data;
62         char *p, *buf;
63         ssize_t bytes, rest;
64
65         if (is_omap_iommu_detached(obj))
66                 return -EPERM;
67
68         buf = kmalloc(count, GFP_KERNEL);
69         if (!buf)
70                 return -ENOMEM;
71         p = buf;
72
73         mutex_lock(&iommu_debug_lock);
74
75         p += sprintf(p, "%8s %8s\n", "cam:", "ram:");
76         p += sprintf(p, "-----------------------------------------\n");
77         rest = count - (p - buf);
78         p += omap_dump_tlb_entries(obj, p, rest);
79
80         bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
81
82         mutex_unlock(&iommu_debug_lock);
83         kfree(buf);
84
85         return bytes;
86 }
87
88 static void dump_ioptable(struct seq_file *s)
89 {
90         int i, j;
91         u32 da;
92         u32 *iopgd, *iopte;
93         struct omap_iommu *obj = s->private;
94
95         spin_lock(&obj->page_table_lock);
96
97         iopgd = iopgd_offset(obj, 0);
98         for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) {
99                 if (!*iopgd)
100                         continue;
101
102                 if (!(*iopgd & IOPGD_TABLE)) {
103                         da = i << IOPGD_SHIFT;
104                         seq_printf(s, "1: 0x%08x 0x%08x\n", da, *iopgd);
105                         continue;
106                 }
107
108                 iopte = iopte_offset(iopgd, 0);
109                 for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) {
110                         if (!*iopte)
111                                 continue;
112
113                         da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT);
114                         seq_printf(s, "2: 0x%08x 0x%08x\n", da, *iopte);
115                 }
116         }
117
118         spin_unlock(&obj->page_table_lock);
119 }
120
121 static int debug_read_pagetable(struct seq_file *s, void *data)
122 {
123         struct omap_iommu *obj = s->private;
124
125         if (is_omap_iommu_detached(obj))
126                 return -EPERM;
127
128         mutex_lock(&iommu_debug_lock);
129
130         seq_printf(s, "L: %8s %8s\n", "da:", "pte:");
131         seq_puts(s, "--------------------------\n");
132         dump_ioptable(s);
133
134         mutex_unlock(&iommu_debug_lock);
135
136         return 0;
137 }
138
139 #define DEBUG_SEQ_FOPS_RO(name)                                                \
140         static int debug_open_##name(struct inode *inode, struct file *file)   \
141         {                                                                      \
142                 return single_open(file, debug_read_##name, inode->i_private); \
143         }                                                                      \
144                                                                                \
145         static const struct file_operations debug_##name##_fops = {            \
146                 .open           = debug_open_##name,                           \
147                 .read           = seq_read,                                    \
148                 .llseek         = seq_lseek,                                   \
149                 .release        = single_release,                              \
150         }
151
152 #define DEBUG_FOPS_RO(name)                                             \
153         static const struct file_operations debug_##name##_fops = {     \
154                 .open = simple_open,                                    \
155                 .read = debug_read_##name,                              \
156                 .llseek = generic_file_llseek,                          \
157         };
158
159 DEBUG_FOPS_RO(regs);
160 DEBUG_FOPS_RO(tlb);
161 DEBUG_SEQ_FOPS_RO(pagetable);
162
163 #define __DEBUG_ADD_FILE(attr, mode)                                    \
164         {                                                               \
165                 struct dentry *dent;                                    \
166                 dent = debugfs_create_file(#attr, mode, obj->debug_dir, \
167                                            obj, &debug_##attr##_fops);  \
168                 if (!dent)                                              \
169                         goto err;                                       \
170         }
171
172 #define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 0400)
173
174 void omap_iommu_debugfs_add(struct omap_iommu *obj)
175 {
176         struct dentry *d;
177
178         if (!iommu_debug_root)
179                 return;
180
181         obj->debug_dir = debugfs_create_dir(obj->name, iommu_debug_root);
182         if (!obj->debug_dir)
183                 return;
184
185         d = debugfs_create_u8("nr_tlb_entries", 0400, obj->debug_dir,
186                               (u8 *)&obj->nr_tlb_entries);
187         if (!d)
188                 return;
189
190         DEBUG_ADD_FILE_RO(regs);
191         DEBUG_ADD_FILE_RO(tlb);
192         DEBUG_ADD_FILE_RO(pagetable);
193
194         return;
195
196 err:
197         debugfs_remove_recursive(obj->debug_dir);
198 }
199
200 void omap_iommu_debugfs_remove(struct omap_iommu *obj)
201 {
202         if (!obj->debug_dir)
203                 return;
204
205         debugfs_remove_recursive(obj->debug_dir);
206 }
207
208 void __init omap_iommu_debugfs_init(void)
209 {
210         iommu_debug_root = debugfs_create_dir("omap_iommu", NULL);
211         if (!iommu_debug_root)
212                 pr_err("can't create debugfs dir\n");
213 }
214
215 void __exit omap_iommu_debugfs_exit(void)
216 {
217         debugfs_remove(iommu_debug_root);
218 }