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