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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> | |
14 | #include <linux/clk.h> | |
15 | #include <linux/io.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
14e0e679 HD |
17 | #include <linux/uaccess.h> |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/debugfs.h> | |
20 | ||
ce491cf8 TL |
21 | #include <plat/iommu.h> |
22 | #include <plat/iovmm.h> | |
14e0e679 HD |
23 | |
24 | #include "iopgtable.h" | |
25 | ||
26 | #define MAXCOLUMN 100 /* for short messages */ | |
27 | ||
28 | static DEFINE_MUTEX(iommu_debug_lock); | |
29 | ||
30 | static struct dentry *iommu_debug_root; | |
31 | ||
32 | static ssize_t debug_read_ver(struct file *file, char __user *userbuf, | |
33 | size_t count, loff_t *ppos) | |
34 | { | |
35 | u32 ver = iommu_arch_version(); | |
36 | char buf[MAXCOLUMN], *p = buf; | |
37 | ||
38 | p += sprintf(p, "H/W version: %d.%d\n", (ver >> 4) & 0xf , ver & 0xf); | |
39 | ||
40 | return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); | |
41 | } | |
42 | ||
43 | static ssize_t debug_read_regs(struct file *file, char __user *userbuf, | |
44 | size_t count, loff_t *ppos) | |
45 | { | |
46 | struct iommu *obj = file->private_data; | |
47 | char *p, *buf; | |
48 | ssize_t bytes; | |
49 | ||
50 | buf = kmalloc(count, GFP_KERNEL); | |
51 | if (!buf) | |
52 | return -ENOMEM; | |
53 | p = buf; | |
54 | ||
55 | mutex_lock(&iommu_debug_lock); | |
56 | ||
57 | bytes = iommu_dump_ctx(obj, p, count); | |
58 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes); | |
59 | ||
60 | mutex_unlock(&iommu_debug_lock); | |
61 | kfree(buf); | |
62 | ||
63 | return bytes; | |
64 | } | |
65 | ||
66 | static ssize_t debug_read_tlb(struct file *file, char __user *userbuf, | |
67 | size_t count, loff_t *ppos) | |
68 | { | |
69 | struct iommu *obj = file->private_data; | |
70 | char *p, *buf; | |
71 | ssize_t bytes, rest; | |
72 | ||
73 | buf = kmalloc(count, GFP_KERNEL); | |
74 | if (!buf) | |
75 | return -ENOMEM; | |
76 | p = buf; | |
77 | ||
78 | mutex_lock(&iommu_debug_lock); | |
79 | ||
80 | p += sprintf(p, "%8s %8s\n", "cam:", "ram:"); | |
81 | p += sprintf(p, "-----------------------------------------\n"); | |
82 | rest = count - (p - buf); | |
83 | p += dump_tlb_entries(obj, p, rest); | |
84 | ||
85 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); | |
86 | ||
87 | mutex_unlock(&iommu_debug_lock); | |
88 | kfree(buf); | |
89 | ||
90 | return bytes; | |
91 | } | |
92 | ||
93 | static ssize_t debug_write_pagetable(struct file *file, | |
94 | const char __user *userbuf, size_t count, loff_t *ppos) | |
95 | { | |
96 | struct iotlb_entry e; | |
97 | struct cr_regs cr; | |
98 | int err; | |
99 | struct iommu *obj = file->private_data; | |
100 | char buf[MAXCOLUMN], *p = buf; | |
101 | ||
102 | count = min(count, sizeof(buf)); | |
103 | ||
104 | mutex_lock(&iommu_debug_lock); | |
105 | if (copy_from_user(p, userbuf, count)) { | |
106 | mutex_unlock(&iommu_debug_lock); | |
107 | return -EFAULT; | |
108 | } | |
109 | ||
110 | sscanf(p, "%x %x", &cr.cam, &cr.ram); | |
111 | if (!cr.cam || !cr.ram) { | |
112 | mutex_unlock(&iommu_debug_lock); | |
113 | return -EINVAL; | |
114 | } | |
115 | ||
116 | iotlb_cr_to_e(&cr, &e); | |
117 | err = iopgtable_store_entry(obj, &e); | |
118 | if (err) | |
119 | dev_err(obj->dev, "%s: fail to store cr\n", __func__); | |
120 | ||
121 | mutex_unlock(&iommu_debug_lock); | |
122 | return count; | |
123 | } | |
124 | ||
125 | #define dump_ioptable_entry_one(lv, da, val) \ | |
126 | ({ \ | |
127 | int __err = 0; \ | |
128 | ssize_t bytes; \ | |
129 | const int maxcol = 22; \ | |
130 | const char *str = "%d: %08x %08x\n"; \ | |
131 | bytes = snprintf(p, maxcol, str, lv, da, val); \ | |
132 | p += bytes; \ | |
133 | len -= bytes; \ | |
134 | if (len < maxcol) \ | |
135 | __err = -ENOMEM; \ | |
136 | __err; \ | |
137 | }) | |
138 | ||
139 | static ssize_t dump_ioptable(struct iommu *obj, char *buf, ssize_t len) | |
140 | { | |
141 | int i; | |
142 | u32 *iopgd; | |
143 | char *p = buf; | |
144 | ||
145 | spin_lock(&obj->page_table_lock); | |
146 | ||
147 | iopgd = iopgd_offset(obj, 0); | |
148 | for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) { | |
149 | int j, err; | |
150 | u32 *iopte; | |
151 | u32 da; | |
152 | ||
153 | if (!*iopgd) | |
154 | continue; | |
155 | ||
156 | if (!(*iopgd & IOPGD_TABLE)) { | |
157 | da = i << IOPGD_SHIFT; | |
158 | ||
159 | err = dump_ioptable_entry_one(1, da, *iopgd); | |
160 | if (err) | |
161 | goto out; | |
162 | continue; | |
163 | } | |
164 | ||
165 | iopte = iopte_offset(iopgd, 0); | |
166 | ||
167 | for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) { | |
168 | if (!*iopte) | |
169 | continue; | |
170 | ||
171 | da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT); | |
172 | err = dump_ioptable_entry_one(2, da, *iopgd); | |
173 | if (err) | |
174 | goto out; | |
175 | } | |
176 | } | |
177 | out: | |
178 | spin_unlock(&obj->page_table_lock); | |
179 | ||
180 | return p - buf; | |
181 | } | |
182 | ||
183 | static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf, | |
184 | size_t count, loff_t *ppos) | |
185 | { | |
186 | struct iommu *obj = file->private_data; | |
187 | char *p, *buf; | |
188 | size_t bytes; | |
189 | ||
190 | buf = (char *)__get_free_page(GFP_KERNEL); | |
191 | if (!buf) | |
192 | return -ENOMEM; | |
193 | p = buf; | |
194 | ||
195 | p += sprintf(p, "L: %8s %8s\n", "da:", "pa:"); | |
196 | p += sprintf(p, "-----------------------------------------\n"); | |
197 | ||
198 | mutex_lock(&iommu_debug_lock); | |
199 | ||
200 | bytes = PAGE_SIZE - (p - buf); | |
201 | p += dump_ioptable(obj, p, bytes); | |
202 | ||
203 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); | |
204 | ||
205 | mutex_unlock(&iommu_debug_lock); | |
206 | free_page((unsigned long)buf); | |
207 | ||
208 | return bytes; | |
209 | } | |
210 | ||
211 | static ssize_t debug_read_mmap(struct file *file, char __user *userbuf, | |
212 | size_t count, loff_t *ppos) | |
213 | { | |
214 | struct iommu *obj = file->private_data; | |
215 | char *p, *buf; | |
216 | struct iovm_struct *tmp; | |
217 | int uninitialized_var(i); | |
218 | ssize_t bytes; | |
219 | ||
220 | buf = (char *)__get_free_page(GFP_KERNEL); | |
221 | if (!buf) | |
222 | return -ENOMEM; | |
223 | p = buf; | |
224 | ||
225 | p += sprintf(p, "%-3s %-8s %-8s %6s %8s\n", | |
226 | "No", "start", "end", "size", "flags"); | |
227 | p += sprintf(p, "-------------------------------------------------\n"); | |
228 | ||
229 | mutex_lock(&iommu_debug_lock); | |
230 | ||
231 | list_for_each_entry(tmp, &obj->mmap, list) { | |
232 | size_t len; | |
233 | const char *str = "%3d %08x-%08x %6x %8x\n"; | |
234 | const int maxcol = 39; | |
235 | ||
236 | len = tmp->da_end - tmp->da_start; | |
237 | p += snprintf(p, maxcol, str, | |
238 | i, tmp->da_start, tmp->da_end, len, tmp->flags); | |
239 | ||
240 | if (PAGE_SIZE - (p - buf) < maxcol) | |
241 | break; | |
242 | i++; | |
243 | } | |
244 | ||
245 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); | |
246 | ||
247 | mutex_unlock(&iommu_debug_lock); | |
248 | free_page((unsigned long)buf); | |
249 | ||
250 | return bytes; | |
251 | } | |
252 | ||
253 | static ssize_t debug_read_mem(struct file *file, char __user *userbuf, | |
254 | size_t count, loff_t *ppos) | |
255 | { | |
256 | struct iommu *obj = file->private_data; | |
257 | char *p, *buf; | |
258 | struct iovm_struct *area; | |
259 | ssize_t bytes; | |
260 | ||
261 | count = min_t(ssize_t, count, PAGE_SIZE); | |
262 | ||
263 | buf = (char *)__get_free_page(GFP_KERNEL); | |
264 | if (!buf) | |
265 | return -ENOMEM; | |
266 | p = buf; | |
267 | ||
268 | mutex_lock(&iommu_debug_lock); | |
269 | ||
270 | area = find_iovm_area(obj, (u32)ppos); | |
271 | if (IS_ERR(area)) { | |
272 | bytes = -EINVAL; | |
273 | goto err_out; | |
274 | } | |
275 | memcpy(p, area->va, count); | |
276 | p += count; | |
277 | ||
278 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); | |
279 | err_out: | |
280 | mutex_unlock(&iommu_debug_lock); | |
281 | free_page((unsigned long)buf); | |
282 | ||
283 | return bytes; | |
284 | } | |
285 | ||
286 | static ssize_t debug_write_mem(struct file *file, const char __user *userbuf, | |
287 | size_t count, loff_t *ppos) | |
288 | { | |
289 | struct iommu *obj = file->private_data; | |
290 | struct iovm_struct *area; | |
291 | char *p, *buf; | |
292 | ||
293 | count = min_t(size_t, count, PAGE_SIZE); | |
294 | ||
295 | buf = (char *)__get_free_page(GFP_KERNEL); | |
296 | if (!buf) | |
297 | return -ENOMEM; | |
298 | p = buf; | |
299 | ||
300 | mutex_lock(&iommu_debug_lock); | |
301 | ||
302 | if (copy_from_user(p, userbuf, count)) { | |
303 | count = -EFAULT; | |
304 | goto err_out; | |
305 | } | |
306 | ||
307 | area = find_iovm_area(obj, (u32)ppos); | |
308 | if (IS_ERR(area)) { | |
309 | count = -EINVAL; | |
310 | goto err_out; | |
311 | } | |
312 | memcpy(area->va, p, count); | |
313 | err_out: | |
314 | mutex_unlock(&iommu_debug_lock); | |
315 | free_page((unsigned long)buf); | |
316 | ||
317 | return count; | |
318 | } | |
319 | ||
320 | static int debug_open_generic(struct inode *inode, struct file *file) | |
321 | { | |
322 | file->private_data = inode->i_private; | |
323 | return 0; | |
324 | } | |
325 | ||
326 | #define DEBUG_FOPS(name) \ | |
327 | static const struct file_operations debug_##name##_fops = { \ | |
328 | .open = debug_open_generic, \ | |
329 | .read = debug_read_##name, \ | |
330 | .write = debug_write_##name, \ | |
331 | }; | |
332 | ||
333 | #define DEBUG_FOPS_RO(name) \ | |
334 | static const struct file_operations debug_##name##_fops = { \ | |
335 | .open = debug_open_generic, \ | |
336 | .read = debug_read_##name, \ | |
337 | }; | |
338 | ||
339 | DEBUG_FOPS_RO(ver); | |
340 | DEBUG_FOPS_RO(regs); | |
341 | DEBUG_FOPS_RO(tlb); | |
342 | DEBUG_FOPS(pagetable); | |
343 | DEBUG_FOPS_RO(mmap); | |
344 | DEBUG_FOPS(mem); | |
345 | ||
346 | #define __DEBUG_ADD_FILE(attr, mode) \ | |
347 | { \ | |
348 | struct dentry *dent; \ | |
349 | dent = debugfs_create_file(#attr, mode, parent, \ | |
350 | obj, &debug_##attr##_fops); \ | |
351 | if (!dent) \ | |
352 | return -ENOMEM; \ | |
353 | } | |
354 | ||
355 | #define DEBUG_ADD_FILE(name) __DEBUG_ADD_FILE(name, 600) | |
356 | #define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 400) | |
357 | ||
358 | static int iommu_debug_register(struct device *dev, void *data) | |
359 | { | |
360 | struct platform_device *pdev = to_platform_device(dev); | |
361 | struct iommu *obj = platform_get_drvdata(pdev); | |
362 | struct dentry *d, *parent; | |
363 | ||
364 | if (!obj || !obj->dev) | |
365 | return -EINVAL; | |
366 | ||
367 | d = debugfs_create_dir(obj->name, iommu_debug_root); | |
368 | if (!d) | |
369 | return -ENOMEM; | |
370 | parent = d; | |
371 | ||
372 | d = debugfs_create_u8("nr_tlb_entries", 400, parent, | |
373 | (u8 *)&obj->nr_tlb_entries); | |
374 | if (!d) | |
375 | return -ENOMEM; | |
376 | ||
377 | DEBUG_ADD_FILE_RO(ver); | |
378 | DEBUG_ADD_FILE_RO(regs); | |
379 | DEBUG_ADD_FILE_RO(tlb); | |
380 | DEBUG_ADD_FILE(pagetable); | |
381 | DEBUG_ADD_FILE_RO(mmap); | |
382 | DEBUG_ADD_FILE(mem); | |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
387 | static int __init iommu_debug_init(void) | |
388 | { | |
389 | struct dentry *d; | |
390 | int err; | |
391 | ||
392 | d = debugfs_create_dir("iommu", NULL); | |
393 | if (!d) | |
394 | return -ENOMEM; | |
395 | iommu_debug_root = d; | |
396 | ||
397 | err = foreach_iommu_device(d, iommu_debug_register); | |
398 | if (err) | |
399 | goto err_out; | |
400 | return 0; | |
401 | ||
402 | err_out: | |
403 | debugfs_remove_recursive(iommu_debug_root); | |
404 | return err; | |
405 | } | |
406 | module_init(iommu_debug_init) | |
407 | ||
408 | static void __exit iommu_debugfs_exit(void) | |
409 | { | |
410 | debugfs_remove_recursive(iommu_debug_root); | |
411 | } | |
412 | module_exit(iommu_debugfs_exit) | |
413 | ||
414 | MODULE_DESCRIPTION("omap iommu: debugfs interface"); | |
415 | MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>"); | |
416 | MODULE_LICENSE("GPL v2"); |