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 | ||
08f2e631 | 13 | #include <linux/module.h> |
14e0e679 HD |
14 | #include <linux/err.h> |
15 | #include <linux/clk.h> | |
16 | #include <linux/io.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
14e0e679 HD |
18 | #include <linux/uaccess.h> |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/debugfs.h> | |
c8d35c84 | 21 | #include <linux/omap-iommu.h> |
2ab7c848 | 22 | #include <linux/platform_data/iommu-omap.h> |
14e0e679 | 23 | |
2f7702af | 24 | #include "omap-iopgtable.h" |
ed1c7de2 | 25 | #include "omap-iommu.h" |
14e0e679 HD |
26 | |
27 | #define MAXCOLUMN 100 /* for short messages */ | |
28 | ||
29 | static DEFINE_MUTEX(iommu_debug_lock); | |
30 | ||
31 | static struct dentry *iommu_debug_root; | |
32 | ||
33 | static ssize_t debug_read_ver(struct file *file, char __user *userbuf, | |
34 | size_t count, loff_t *ppos) | |
35 | { | |
6c32df43 | 36 | u32 ver = omap_iommu_arch_version(); |
14e0e679 HD |
37 | char buf[MAXCOLUMN], *p = buf; |
38 | ||
39 | p += sprintf(p, "H/W version: %d.%d\n", (ver >> 4) & 0xf , ver & 0xf); | |
40 | ||
41 | return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); | |
42 | } | |
43 | ||
44 | static ssize_t debug_read_regs(struct file *file, char __user *userbuf, | |
45 | size_t count, loff_t *ppos) | |
46 | { | |
46451d62 OBC |
47 | struct device *dev = file->private_data; |
48 | struct omap_iommu *obj = dev_to_omap_iommu(dev); | |
14e0e679 HD |
49 | char *p, *buf; |
50 | ssize_t bytes; | |
51 | ||
52 | buf = kmalloc(count, GFP_KERNEL); | |
53 | if (!buf) | |
54 | return -ENOMEM; | |
55 | p = buf; | |
56 | ||
57 | mutex_lock(&iommu_debug_lock); | |
58 | ||
6c32df43 | 59 | bytes = omap_iommu_dump_ctx(obj, p, count); |
14e0e679 HD |
60 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes); |
61 | ||
62 | mutex_unlock(&iommu_debug_lock); | |
63 | kfree(buf); | |
64 | ||
65 | return bytes; | |
66 | } | |
67 | ||
68 | static ssize_t debug_read_tlb(struct file *file, char __user *userbuf, | |
69 | size_t count, loff_t *ppos) | |
70 | { | |
46451d62 OBC |
71 | struct device *dev = file->private_data; |
72 | struct omap_iommu *obj = dev_to_omap_iommu(dev); | |
14e0e679 HD |
73 | char *p, *buf; |
74 | ssize_t bytes, rest; | |
75 | ||
76 | buf = kmalloc(count, GFP_KERNEL); | |
77 | if (!buf) | |
78 | return -ENOMEM; | |
79 | p = buf; | |
80 | ||
81 | mutex_lock(&iommu_debug_lock); | |
82 | ||
83 | p += sprintf(p, "%8s %8s\n", "cam:", "ram:"); | |
84 | p += sprintf(p, "-----------------------------------------\n"); | |
85 | rest = count - (p - buf); | |
6c32df43 | 86 | p += omap_dump_tlb_entries(obj, p, rest); |
14e0e679 HD |
87 | |
88 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); | |
89 | ||
90 | mutex_unlock(&iommu_debug_lock); | |
91 | kfree(buf); | |
92 | ||
93 | return bytes; | |
94 | } | |
95 | ||
96 | static ssize_t debug_write_pagetable(struct file *file, | |
97 | const char __user *userbuf, size_t count, loff_t *ppos) | |
98 | { | |
99 | struct iotlb_entry e; | |
100 | struct cr_regs cr; | |
101 | int err; | |
46451d62 OBC |
102 | struct device *dev = file->private_data; |
103 | struct omap_iommu *obj = dev_to_omap_iommu(dev); | |
14e0e679 HD |
104 | char buf[MAXCOLUMN], *p = buf; |
105 | ||
106 | count = min(count, sizeof(buf)); | |
107 | ||
108 | mutex_lock(&iommu_debug_lock); | |
109 | if (copy_from_user(p, userbuf, count)) { | |
110 | mutex_unlock(&iommu_debug_lock); | |
111 | return -EFAULT; | |
112 | } | |
113 | ||
114 | sscanf(p, "%x %x", &cr.cam, &cr.ram); | |
115 | if (!cr.cam || !cr.ram) { | |
116 | mutex_unlock(&iommu_debug_lock); | |
117 | return -EINVAL; | |
118 | } | |
119 | ||
6c32df43 OBC |
120 | omap_iotlb_cr_to_e(&cr, &e); |
121 | err = omap_iopgtable_store_entry(obj, &e); | |
14e0e679 HD |
122 | if (err) |
123 | dev_err(obj->dev, "%s: fail to store cr\n", __func__); | |
124 | ||
125 | mutex_unlock(&iommu_debug_lock); | |
126 | return count; | |
127 | } | |
128 | ||
129 | #define dump_ioptable_entry_one(lv, da, val) \ | |
130 | ({ \ | |
131 | int __err = 0; \ | |
132 | ssize_t bytes; \ | |
133 | const int maxcol = 22; \ | |
134 | const char *str = "%d: %08x %08x\n"; \ | |
135 | bytes = snprintf(p, maxcol, str, lv, da, val); \ | |
136 | p += bytes; \ | |
137 | len -= bytes; \ | |
138 | if (len < maxcol) \ | |
139 | __err = -ENOMEM; \ | |
140 | __err; \ | |
141 | }) | |
142 | ||
6c32df43 | 143 | static ssize_t dump_ioptable(struct omap_iommu *obj, char *buf, ssize_t len) |
14e0e679 HD |
144 | { |
145 | int i; | |
146 | u32 *iopgd; | |
147 | char *p = buf; | |
148 | ||
149 | spin_lock(&obj->page_table_lock); | |
150 | ||
151 | iopgd = iopgd_offset(obj, 0); | |
152 | for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) { | |
153 | int j, err; | |
154 | u32 *iopte; | |
155 | u32 da; | |
156 | ||
157 | if (!*iopgd) | |
158 | continue; | |
159 | ||
160 | if (!(*iopgd & IOPGD_TABLE)) { | |
161 | da = i << IOPGD_SHIFT; | |
162 | ||
163 | err = dump_ioptable_entry_one(1, da, *iopgd); | |
164 | if (err) | |
165 | goto out; | |
166 | continue; | |
167 | } | |
168 | ||
169 | iopte = iopte_offset(iopgd, 0); | |
170 | ||
171 | for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) { | |
172 | if (!*iopte) | |
173 | continue; | |
174 | ||
175 | da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT); | |
176 | err = dump_ioptable_entry_one(2, da, *iopgd); | |
177 | if (err) | |
178 | goto out; | |
179 | } | |
180 | } | |
181 | out: | |
182 | spin_unlock(&obj->page_table_lock); | |
183 | ||
184 | return p - buf; | |
185 | } | |
186 | ||
187 | static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf, | |
188 | size_t count, loff_t *ppos) | |
189 | { | |
46451d62 OBC |
190 | struct device *dev = file->private_data; |
191 | struct omap_iommu *obj = dev_to_omap_iommu(dev); | |
14e0e679 HD |
192 | char *p, *buf; |
193 | size_t bytes; | |
194 | ||
195 | buf = (char *)__get_free_page(GFP_KERNEL); | |
196 | if (!buf) | |
197 | return -ENOMEM; | |
198 | p = buf; | |
199 | ||
200 | p += sprintf(p, "L: %8s %8s\n", "da:", "pa:"); | |
201 | p += sprintf(p, "-----------------------------------------\n"); | |
202 | ||
203 | mutex_lock(&iommu_debug_lock); | |
204 | ||
205 | bytes = PAGE_SIZE - (p - buf); | |
206 | p += dump_ioptable(obj, p, bytes); | |
207 | ||
208 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); | |
209 | ||
210 | mutex_unlock(&iommu_debug_lock); | |
211 | free_page((unsigned long)buf); | |
212 | ||
213 | return bytes; | |
214 | } | |
215 | ||
14e0e679 HD |
216 | #define DEBUG_FOPS(name) \ |
217 | static const struct file_operations debug_##name##_fops = { \ | |
234e3405 | 218 | .open = simple_open, \ |
14e0e679 HD |
219 | .read = debug_read_##name, \ |
220 | .write = debug_write_##name, \ | |
c0b0aca0 | 221 | .llseek = generic_file_llseek, \ |
14e0e679 HD |
222 | }; |
223 | ||
224 | #define DEBUG_FOPS_RO(name) \ | |
225 | static const struct file_operations debug_##name##_fops = { \ | |
234e3405 | 226 | .open = simple_open, \ |
14e0e679 | 227 | .read = debug_read_##name, \ |
c0b0aca0 | 228 | .llseek = generic_file_llseek, \ |
14e0e679 HD |
229 | }; |
230 | ||
231 | DEBUG_FOPS_RO(ver); | |
232 | DEBUG_FOPS_RO(regs); | |
233 | DEBUG_FOPS_RO(tlb); | |
234 | DEBUG_FOPS(pagetable); | |
14e0e679 HD |
235 | |
236 | #define __DEBUG_ADD_FILE(attr, mode) \ | |
237 | { \ | |
238 | struct dentry *dent; \ | |
239 | dent = debugfs_create_file(#attr, mode, parent, \ | |
46451d62 | 240 | dev, &debug_##attr##_fops); \ |
14e0e679 HD |
241 | if (!dent) \ |
242 | return -ENOMEM; \ | |
243 | } | |
244 | ||
ff3a2b73 JP |
245 | #define DEBUG_ADD_FILE(name) __DEBUG_ADD_FILE(name, 0600) |
246 | #define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 0400) | |
14e0e679 HD |
247 | |
248 | static int iommu_debug_register(struct device *dev, void *data) | |
249 | { | |
250 | struct platform_device *pdev = to_platform_device(dev); | |
6c32df43 | 251 | struct omap_iommu *obj = platform_get_drvdata(pdev); |
46451d62 | 252 | struct omap_iommu_arch_data *arch_data; |
14e0e679 HD |
253 | struct dentry *d, *parent; |
254 | ||
255 | if (!obj || !obj->dev) | |
256 | return -EINVAL; | |
257 | ||
46451d62 OBC |
258 | arch_data = kzalloc(sizeof(*arch_data), GFP_KERNEL); |
259 | if (!arch_data) | |
260 | return -ENOMEM; | |
261 | ||
262 | arch_data->iommu_dev = obj; | |
263 | ||
264 | dev->archdata.iommu = arch_data; | |
265 | ||
14e0e679 HD |
266 | d = debugfs_create_dir(obj->name, iommu_debug_root); |
267 | if (!d) | |
46451d62 | 268 | goto nomem; |
14e0e679 HD |
269 | parent = d; |
270 | ||
271 | d = debugfs_create_u8("nr_tlb_entries", 400, parent, | |
272 | (u8 *)&obj->nr_tlb_entries); | |
273 | if (!d) | |
46451d62 | 274 | goto nomem; |
14e0e679 HD |
275 | |
276 | DEBUG_ADD_FILE_RO(ver); | |
277 | DEBUG_ADD_FILE_RO(regs); | |
278 | DEBUG_ADD_FILE_RO(tlb); | |
279 | DEBUG_ADD_FILE(pagetable); | |
14e0e679 | 280 | |
46451d62 OBC |
281 | return 0; |
282 | ||
283 | nomem: | |
284 | kfree(arch_data); | |
285 | return -ENOMEM; | |
286 | } | |
287 | ||
288 | static int iommu_debug_unregister(struct device *dev, void *data) | |
289 | { | |
290 | if (!dev->archdata.iommu) | |
291 | return 0; | |
292 | ||
293 | kfree(dev->archdata.iommu); | |
294 | ||
295 | dev->archdata.iommu = NULL; | |
296 | ||
14e0e679 HD |
297 | return 0; |
298 | } | |
299 | ||
300 | static int __init iommu_debug_init(void) | |
301 | { | |
302 | struct dentry *d; | |
303 | int err; | |
304 | ||
305 | d = debugfs_create_dir("iommu", NULL); | |
306 | if (!d) | |
307 | return -ENOMEM; | |
308 | iommu_debug_root = d; | |
309 | ||
6c32df43 | 310 | err = omap_foreach_iommu_device(d, iommu_debug_register); |
14e0e679 HD |
311 | if (err) |
312 | goto err_out; | |
313 | return 0; | |
314 | ||
315 | err_out: | |
316 | debugfs_remove_recursive(iommu_debug_root); | |
317 | return err; | |
318 | } | |
319 | module_init(iommu_debug_init) | |
320 | ||
321 | static void __exit iommu_debugfs_exit(void) | |
322 | { | |
323 | debugfs_remove_recursive(iommu_debug_root); | |
46451d62 | 324 | omap_foreach_iommu_device(NULL, iommu_debug_unregister); |
14e0e679 HD |
325 | } |
326 | module_exit(iommu_debugfs_exit) | |
327 | ||
328 | MODULE_DESCRIPTION("omap iommu: debugfs interface"); | |
329 | MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>"); | |
330 | MODULE_LICENSE("GPL v2"); |