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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/module.h> |
14 | #include <linux/err.h> |
15 | #include <linux/clk.h> |
16 | #include <linux/io.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/uaccess.h> |
19 | #include <linux/platform_device.h> |
20 | #include <linux/debugfs.h> |
21 | #include <linux/omap-iommu.h> |
22 | #include <linux/platform_data/iommu-omap.h> |
23 | |
24 | #include "omap-iopgtable.h" |
25 | #include "omap-iommu.h" |
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 | { |
36 | u32 ver = omap_iommu_arch_version(); |
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 | { |
47 | struct device *dev = file->private_data; |
48 | struct omap_iommu *obj = dev_to_omap_iommu(dev); |
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 | |
59 | bytes = omap_iommu_dump_ctx(obj, p, count); |
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 | { |
71 | struct device *dev = file->private_data; |
72 | struct omap_iommu *obj = dev_to_omap_iommu(dev); |
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); |
86 | p += omap_dump_tlb_entries(obj, p, rest); |
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; |
102 | struct device *dev = file->private_data; |
103 | struct omap_iommu *obj = dev_to_omap_iommu(dev); |
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 | |
120 | omap_iotlb_cr_to_e(&cr, &e); |
121 | err = omap_iopgtable_store_entry(obj, &e); |
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 | |
143 | static ssize_t dump_ioptable(struct omap_iommu *obj, char *buf, ssize_t len) |
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 | { |
190 | struct device *dev = file->private_data; |
191 | struct omap_iommu *obj = dev_to_omap_iommu(dev); |
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 | |
216 | static ssize_t debug_read_mmap(struct file *file, char __user *userbuf, |
217 | size_t count, loff_t *ppos) |
218 | { |
219 | struct device *dev = file->private_data; |
220 | struct omap_iommu *obj = dev_to_omap_iommu(dev); |
221 | char *p, *buf; |
222 | struct iovm_struct *tmp; |
223 | int uninitialized_var(i); |
224 | ssize_t bytes; |
225 | |
226 | buf = (char *)__get_free_page(GFP_KERNEL); |
227 | if (!buf) |
228 | return -ENOMEM; |
229 | p = buf; |
230 | |
231 | p += sprintf(p, "%-3s %-8s %-8s %6s %8s\n", |
232 | "No", "start", "end", "size", "flags"); |
233 | p += sprintf(p, "-------------------------------------------------\n"); |
234 | |
235 | mutex_lock(&iommu_debug_lock); |
236 | |
237 | list_for_each_entry(tmp, &obj->mmap, list) { |
238 | size_t len; |
239 | const char *str = "%3d %08x-%08x %6x %8x\n"; |
240 | const int maxcol = 39; |
241 | |
242 | len = tmp->da_end - tmp->da_start; |
243 | p += snprintf(p, maxcol, str, |
244 | i, tmp->da_start, tmp->da_end, len, tmp->flags); |
245 | |
246 | if (PAGE_SIZE - (p - buf) < maxcol) |
247 | break; |
248 | i++; |
249 | } |
250 | |
251 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); |
252 | |
253 | mutex_unlock(&iommu_debug_lock); |
254 | free_page((unsigned long)buf); |
255 | |
256 | return bytes; |
257 | } |
258 | |
259 | static ssize_t debug_read_mem(struct file *file, char __user *userbuf, |
260 | size_t count, loff_t *ppos) |
261 | { |
262 | struct device *dev = file->private_data; |
263 | char *p, *buf; |
264 | struct iovm_struct *area; |
265 | ssize_t bytes; |
266 | |
267 | count = min_t(ssize_t, count, PAGE_SIZE); |
268 | |
269 | buf = (char *)__get_free_page(GFP_KERNEL); |
270 | if (!buf) |
271 | return -ENOMEM; |
272 | p = buf; |
273 | |
274 | mutex_lock(&iommu_debug_lock); |
275 | |
276 | area = omap_find_iovm_area(dev, (u32)ppos); |
277 | if (!area) { |
278 | bytes = -EINVAL; |
279 | goto err_out; |
280 | } |
281 | memcpy(p, area->va, count); |
282 | p += count; |
283 | |
284 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); |
285 | err_out: |
286 | mutex_unlock(&iommu_debug_lock); |
287 | free_page((unsigned long)buf); |
288 | |
289 | return bytes; |
290 | } |
291 | |
292 | static ssize_t debug_write_mem(struct file *file, const char __user *userbuf, |
293 | size_t count, loff_t *ppos) |
294 | { |
295 | struct device *dev = file->private_data; |
296 | struct iovm_struct *area; |
297 | char *p, *buf; |
298 | |
299 | count = min_t(size_t, count, PAGE_SIZE); |
300 | |
301 | buf = (char *)__get_free_page(GFP_KERNEL); |
302 | if (!buf) |
303 | return -ENOMEM; |
304 | p = buf; |
305 | |
306 | mutex_lock(&iommu_debug_lock); |
307 | |
308 | if (copy_from_user(p, userbuf, count)) { |
309 | count = -EFAULT; |
310 | goto err_out; |
311 | } |
312 | |
313 | area = omap_find_iovm_area(dev, (u32)ppos); |
314 | if (!area) { |
315 | count = -EINVAL; |
316 | goto err_out; |
317 | } |
318 | memcpy(area->va, p, count); |
319 | err_out: |
320 | mutex_unlock(&iommu_debug_lock); |
321 | free_page((unsigned long)buf); |
322 | |
323 | return count; |
324 | } |
325 | |
326 | #define DEBUG_FOPS(name) \ |
327 | static const struct file_operations debug_##name##_fops = { \ |
328 | .open = simple_open, \ |
329 | .read = debug_read_##name, \ |
330 | .write = debug_write_##name, \ |
331 | .llseek = generic_file_llseek, \ |
332 | }; |
333 | |
334 | #define DEBUG_FOPS_RO(name) \ |
335 | static const struct file_operations debug_##name##_fops = { \ |
336 | .open = simple_open, \ |
337 | .read = debug_read_##name, \ |
338 | .llseek = generic_file_llseek, \ |
339 | }; |
340 | |
341 | DEBUG_FOPS_RO(ver); |
342 | DEBUG_FOPS_RO(regs); |
343 | DEBUG_FOPS_RO(tlb); |
344 | DEBUG_FOPS(pagetable); |
345 | DEBUG_FOPS_RO(mmap); |
346 | DEBUG_FOPS(mem); |
347 | |
348 | #define __DEBUG_ADD_FILE(attr, mode) \ |
349 | { \ |
350 | struct dentry *dent; \ |
351 | dent = debugfs_create_file(#attr, mode, parent, \ |
352 | dev, &debug_##attr##_fops); \ |
353 | if (!dent) \ |
354 | return -ENOMEM; \ |
355 | } |
356 | |
357 | #define DEBUG_ADD_FILE(name) __DEBUG_ADD_FILE(name, 600) |
358 | #define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 400) |
359 | |
360 | static int iommu_debug_register(struct device *dev, void *data) |
361 | { |
362 | struct platform_device *pdev = to_platform_device(dev); |
363 | struct omap_iommu *obj = platform_get_drvdata(pdev); |
364 | struct omap_iommu_arch_data *arch_data; |
365 | struct dentry *d, *parent; |
366 | |
367 | if (!obj || !obj->dev) |
368 | return -EINVAL; |
369 | |
370 | arch_data = kzalloc(sizeof(*arch_data), GFP_KERNEL); |
371 | if (!arch_data) |
372 | return -ENOMEM; |
373 | |
374 | arch_data->iommu_dev = obj; |
375 | |
376 | dev->archdata.iommu = arch_data; |
377 | |
378 | d = debugfs_create_dir(obj->name, iommu_debug_root); |
379 | if (!d) |
380 | goto nomem; |
381 | parent = d; |
382 | |
383 | d = debugfs_create_u8("nr_tlb_entries", 400, parent, |
384 | (u8 *)&obj->nr_tlb_entries); |
385 | if (!d) |
386 | goto nomem; |
387 | |
388 | DEBUG_ADD_FILE_RO(ver); |
389 | DEBUG_ADD_FILE_RO(regs); |
390 | DEBUG_ADD_FILE_RO(tlb); |
391 | DEBUG_ADD_FILE(pagetable); |
392 | DEBUG_ADD_FILE_RO(mmap); |
393 | DEBUG_ADD_FILE(mem); |
394 | |
395 | return 0; |
396 | |
397 | nomem: |
398 | kfree(arch_data); |
399 | return -ENOMEM; |
400 | } |
401 | |
402 | static int iommu_debug_unregister(struct device *dev, void *data) |
403 | { |
404 | if (!dev->archdata.iommu) |
405 | return 0; |
406 | |
407 | kfree(dev->archdata.iommu); |
408 | |
409 | dev->archdata.iommu = NULL; |
410 | |
411 | return 0; |
412 | } |
413 | |
414 | static int __init iommu_debug_init(void) |
415 | { |
416 | struct dentry *d; |
417 | int err; |
418 | |
419 | d = debugfs_create_dir("iommu", NULL); |
420 | if (!d) |
421 | return -ENOMEM; |
422 | iommu_debug_root = d; |
423 | |
424 | err = omap_foreach_iommu_device(d, iommu_debug_register); |
425 | if (err) |
426 | goto err_out; |
427 | return 0; |
428 | |
429 | err_out: |
430 | debugfs_remove_recursive(iommu_debug_root); |
431 | return err; |
432 | } |
433 | module_init(iommu_debug_init) |
434 | |
435 | static void __exit iommu_debugfs_exit(void) |
436 | { |
437 | debugfs_remove_recursive(iommu_debug_root); |
438 | omap_foreach_iommu_device(NULL, iommu_debug_unregister); |
439 | } |
440 | module_exit(iommu_debugfs_exit) |
441 | |
442 | MODULE_DESCRIPTION("omap iommu: debugfs interface"); |
443 | MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>"); |
444 | MODULE_LICENSE("GPL v2"); |
445 |
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