Commit | Line | Data |
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14e0e679 HD |
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> | |
14e0e679 | 14 | #include <linux/io.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
14e0e679 | 16 | #include <linux/uaccess.h> |
14e0e679 | 17 | #include <linux/debugfs.h> |
2ab7c848 | 18 | #include <linux/platform_data/iommu-omap.h> |
14e0e679 | 19 | |
2f7702af | 20 | #include "omap-iopgtable.h" |
ed1c7de2 | 21 | #include "omap-iommu.h" |
14e0e679 | 22 | |
14e0e679 HD |
23 | static DEFINE_MUTEX(iommu_debug_lock); |
24 | ||
25 | static struct dentry *iommu_debug_root; | |
26 | ||
c5cf5c53 SA |
27 | static inline bool is_omap_iommu_detached(struct omap_iommu *obj) |
28 | { | |
29 | return !obj->domain; | |
30 | } | |
31 | ||
14e0e679 HD |
32 | static ssize_t debug_read_regs(struct file *file, char __user *userbuf, |
33 | size_t count, loff_t *ppos) | |
34 | { | |
61c75352 | 35 | struct omap_iommu *obj = file->private_data; |
14e0e679 HD |
36 | char *p, *buf; |
37 | ssize_t bytes; | |
38 | ||
c5cf5c53 SA |
39 | if (is_omap_iommu_detached(obj)) |
40 | return -EPERM; | |
41 | ||
14e0e679 HD |
42 | buf = kmalloc(count, GFP_KERNEL); |
43 | if (!buf) | |
44 | return -ENOMEM; | |
45 | p = buf; | |
46 | ||
47 | mutex_lock(&iommu_debug_lock); | |
48 | ||
6c32df43 | 49 | bytes = omap_iommu_dump_ctx(obj, p, count); |
14e0e679 HD |
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 | { | |
61c75352 | 61 | struct omap_iommu *obj = file->private_data; |
14e0e679 HD |
62 | char *p, *buf; |
63 | ssize_t bytes, rest; | |
64 | ||
c5cf5c53 SA |
65 | if (is_omap_iommu_detached(obj)) |
66 | return -EPERM; | |
67 | ||
14e0e679 HD |
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); | |
6c32df43 | 78 | p += omap_dump_tlb_entries(obj, p, rest); |
14e0e679 HD |
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 | ||
9c83e9f3 | 88 | static void dump_ioptable(struct seq_file *s) |
14e0e679 | 89 | { |
9c83e9f3 SA |
90 | int i, j; |
91 | u32 da; | |
92 | u32 *iopgd, *iopte; | |
93 | struct omap_iommu *obj = s->private; | |
14e0e679 HD |
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++) { | |
14e0e679 HD |
99 | if (!*iopgd) |
100 | continue; | |
101 | ||
102 | if (!(*iopgd & IOPGD_TABLE)) { | |
103 | da = i << IOPGD_SHIFT; | |
9c83e9f3 | 104 | seq_printf(s, "1: 0x%08x 0x%08x\n", da, *iopgd); |
14e0e679 HD |
105 | continue; |
106 | } | |
107 | ||
108 | iopte = iopte_offset(iopgd, 0); | |
14e0e679 HD |
109 | for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) { |
110 | if (!*iopte) | |
111 | continue; | |
112 | ||
113 | da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT); | |
9c83e9f3 | 114 | seq_printf(s, "2: 0x%08x 0x%08x\n", da, *iopte); |
14e0e679 HD |
115 | } |
116 | } | |
14e0e679 | 117 | |
9c83e9f3 | 118 | spin_unlock(&obj->page_table_lock); |
14e0e679 HD |
119 | } |
120 | ||
9c83e9f3 | 121 | static int debug_read_pagetable(struct seq_file *s, void *data) |
14e0e679 | 122 | { |
9c83e9f3 | 123 | struct omap_iommu *obj = s->private; |
14e0e679 | 124 | |
c5cf5c53 SA |
125 | if (is_omap_iommu_detached(obj)) |
126 | return -EPERM; | |
127 | ||
14e0e679 HD |
128 | mutex_lock(&iommu_debug_lock); |
129 | ||
9c83e9f3 SA |
130 | seq_printf(s, "L: %8s %8s\n", "da:", "pte:"); |
131 | seq_puts(s, "--------------------------\n"); | |
132 | dump_ioptable(s); | |
14e0e679 HD |
133 | |
134 | mutex_unlock(&iommu_debug_lock); | |
14e0e679 | 135 | |
9c83e9f3 | 136 | return 0; |
14e0e679 HD |
137 | } |
138 | ||
9c83e9f3 SA |
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 | ||
14e0e679 HD |
152 | #define DEBUG_FOPS_RO(name) \ |
153 | static const struct file_operations debug_##name##_fops = { \ | |
234e3405 | 154 | .open = simple_open, \ |
14e0e679 | 155 | .read = debug_read_##name, \ |
c0b0aca0 | 156 | .llseek = generic_file_llseek, \ |
14e0e679 HD |
157 | }; |
158 | ||
14e0e679 HD |
159 | DEBUG_FOPS_RO(regs); |
160 | DEBUG_FOPS_RO(tlb); | |
9c83e9f3 | 161 | DEBUG_SEQ_FOPS_RO(pagetable); |
14e0e679 HD |
162 | |
163 | #define __DEBUG_ADD_FILE(attr, mode) \ | |
164 | { \ | |
165 | struct dentry *dent; \ | |
61c75352 SA |
166 | dent = debugfs_create_file(#attr, mode, obj->debug_dir, \ |
167 | obj, &debug_##attr##_fops); \ | |
14e0e679 | 168 | if (!dent) \ |
61c75352 | 169 | goto err; \ |
14e0e679 HD |
170 | } |
171 | ||
ff3a2b73 | 172 | #define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 0400) |
14e0e679 | 173 | |
61c75352 | 174 | void omap_iommu_debugfs_add(struct omap_iommu *obj) |
14e0e679 | 175 | { |
61c75352 | 176 | struct dentry *d; |
46451d62 | 177 | |
61c75352 SA |
178 | if (!iommu_debug_root) |
179 | return; | |
46451d62 | 180 | |
61c75352 SA |
181 | obj->debug_dir = debugfs_create_dir(obj->name, iommu_debug_root); |
182 | if (!obj->debug_dir) | |
183 | return; | |
14e0e679 | 184 | |
61c75352 | 185 | d = debugfs_create_u8("nr_tlb_entries", 0400, obj->debug_dir, |
14e0e679 HD |
186 | (u8 *)&obj->nr_tlb_entries); |
187 | if (!d) | |
61c75352 | 188 | return; |
14e0e679 | 189 | |
14e0e679 HD |
190 | DEBUG_ADD_FILE_RO(regs); |
191 | DEBUG_ADD_FILE_RO(tlb); | |
3ca5db07 | 192 | DEBUG_ADD_FILE_RO(pagetable); |
14e0e679 | 193 | |
61c75352 | 194 | return; |
46451d62 | 195 | |
61c75352 SA |
196 | err: |
197 | debugfs_remove_recursive(obj->debug_dir); | |
46451d62 OBC |
198 | } |
199 | ||
61c75352 | 200 | void omap_iommu_debugfs_remove(struct omap_iommu *obj) |
46451d62 | 201 | { |
61c75352 SA |
202 | if (!obj->debug_dir) |
203 | return; | |
46451d62 | 204 | |
61c75352 | 205 | debugfs_remove_recursive(obj->debug_dir); |
14e0e679 HD |
206 | } |
207 | ||
61c75352 | 208 | void __init omap_iommu_debugfs_init(void) |
14e0e679 | 209 | { |
61c75352 SA |
210 | iommu_debug_root = debugfs_create_dir("omap_iommu", NULL); |
211 | if (!iommu_debug_root) | |
212 | pr_err("can't create debugfs dir\n"); | |
14e0e679 | 213 | } |
14e0e679 | 214 | |
61c75352 | 215 | void __exit omap_iommu_debugfs_exit(void) |
14e0e679 | 216 | { |
61c75352 | 217 | debugfs_remove(iommu_debug_root); |
14e0e679 | 218 | } |