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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> | |
21 | ||
ce491cf8 TL |
22 | #include <plat/iommu.h> |
23 | #include <plat/iovmm.h> | |
14e0e679 | 24 | |
fcf3a6ef | 25 | #include <plat/iopgtable.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 | { | |
6c32df43 | 47 | struct omap_iommu *obj = file->private_data; |
14e0e679 HD |
48 | char *p, *buf; |
49 | ssize_t bytes; | |
50 | ||
51 | buf = kmalloc(count, GFP_KERNEL); | |
52 | if (!buf) | |
53 | return -ENOMEM; | |
54 | p = buf; | |
55 | ||
56 | mutex_lock(&iommu_debug_lock); | |
57 | ||
6c32df43 | 58 | bytes = omap_iommu_dump_ctx(obj, p, count); |
14e0e679 HD |
59 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes); |
60 | ||
61 | mutex_unlock(&iommu_debug_lock); | |
62 | kfree(buf); | |
63 | ||
64 | return bytes; | |
65 | } | |
66 | ||
67 | static ssize_t debug_read_tlb(struct file *file, char __user *userbuf, | |
68 | size_t count, loff_t *ppos) | |
69 | { | |
6c32df43 | 70 | struct omap_iommu *obj = file->private_data; |
14e0e679 HD |
71 | char *p, *buf; |
72 | ssize_t bytes, rest; | |
73 | ||
74 | buf = kmalloc(count, GFP_KERNEL); | |
75 | if (!buf) | |
76 | return -ENOMEM; | |
77 | p = buf; | |
78 | ||
79 | mutex_lock(&iommu_debug_lock); | |
80 | ||
81 | p += sprintf(p, "%8s %8s\n", "cam:", "ram:"); | |
82 | p += sprintf(p, "-----------------------------------------\n"); | |
83 | rest = count - (p - buf); | |
6c32df43 | 84 | p += omap_dump_tlb_entries(obj, p, rest); |
14e0e679 HD |
85 | |
86 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); | |
87 | ||
88 | mutex_unlock(&iommu_debug_lock); | |
89 | kfree(buf); | |
90 | ||
91 | return bytes; | |
92 | } | |
93 | ||
94 | static ssize_t debug_write_pagetable(struct file *file, | |
95 | const char __user *userbuf, size_t count, loff_t *ppos) | |
96 | { | |
97 | struct iotlb_entry e; | |
98 | struct cr_regs cr; | |
99 | int err; | |
6c32df43 | 100 | struct omap_iommu *obj = file->private_data; |
14e0e679 HD |
101 | char buf[MAXCOLUMN], *p = buf; |
102 | ||
103 | count = min(count, sizeof(buf)); | |
104 | ||
105 | mutex_lock(&iommu_debug_lock); | |
106 | if (copy_from_user(p, userbuf, count)) { | |
107 | mutex_unlock(&iommu_debug_lock); | |
108 | return -EFAULT; | |
109 | } | |
110 | ||
111 | sscanf(p, "%x %x", &cr.cam, &cr.ram); | |
112 | if (!cr.cam || !cr.ram) { | |
113 | mutex_unlock(&iommu_debug_lock); | |
114 | return -EINVAL; | |
115 | } | |
116 | ||
6c32df43 OBC |
117 | omap_iotlb_cr_to_e(&cr, &e); |
118 | err = omap_iopgtable_store_entry(obj, &e); | |
14e0e679 HD |
119 | if (err) |
120 | dev_err(obj->dev, "%s: fail to store cr\n", __func__); | |
121 | ||
122 | mutex_unlock(&iommu_debug_lock); | |
123 | return count; | |
124 | } | |
125 | ||
126 | #define dump_ioptable_entry_one(lv, da, val) \ | |
127 | ({ \ | |
128 | int __err = 0; \ | |
129 | ssize_t bytes; \ | |
130 | const int maxcol = 22; \ | |
131 | const char *str = "%d: %08x %08x\n"; \ | |
132 | bytes = snprintf(p, maxcol, str, lv, da, val); \ | |
133 | p += bytes; \ | |
134 | len -= bytes; \ | |
135 | if (len < maxcol) \ | |
136 | __err = -ENOMEM; \ | |
137 | __err; \ | |
138 | }) | |
139 | ||
6c32df43 | 140 | static ssize_t dump_ioptable(struct omap_iommu *obj, char *buf, ssize_t len) |
14e0e679 HD |
141 | { |
142 | int i; | |
143 | u32 *iopgd; | |
144 | char *p = buf; | |
145 | ||
146 | spin_lock(&obj->page_table_lock); | |
147 | ||
148 | iopgd = iopgd_offset(obj, 0); | |
149 | for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) { | |
150 | int j, err; | |
151 | u32 *iopte; | |
152 | u32 da; | |
153 | ||
154 | if (!*iopgd) | |
155 | continue; | |
156 | ||
157 | if (!(*iopgd & IOPGD_TABLE)) { | |
158 | da = i << IOPGD_SHIFT; | |
159 | ||
160 | err = dump_ioptable_entry_one(1, da, *iopgd); | |
161 | if (err) | |
162 | goto out; | |
163 | continue; | |
164 | } | |
165 | ||
166 | iopte = iopte_offset(iopgd, 0); | |
167 | ||
168 | for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) { | |
169 | if (!*iopte) | |
170 | continue; | |
171 | ||
172 | da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT); | |
173 | err = dump_ioptable_entry_one(2, da, *iopgd); | |
174 | if (err) | |
175 | goto out; | |
176 | } | |
177 | } | |
178 | out: | |
179 | spin_unlock(&obj->page_table_lock); | |
180 | ||
181 | return p - buf; | |
182 | } | |
183 | ||
184 | static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf, | |
185 | size_t count, loff_t *ppos) | |
186 | { | |
6c32df43 | 187 | struct omap_iommu *obj = file->private_data; |
14e0e679 HD |
188 | char *p, *buf; |
189 | size_t bytes; | |
190 | ||
191 | buf = (char *)__get_free_page(GFP_KERNEL); | |
192 | if (!buf) | |
193 | return -ENOMEM; | |
194 | p = buf; | |
195 | ||
196 | p += sprintf(p, "L: %8s %8s\n", "da:", "pa:"); | |
197 | p += sprintf(p, "-----------------------------------------\n"); | |
198 | ||
199 | mutex_lock(&iommu_debug_lock); | |
200 | ||
201 | bytes = PAGE_SIZE - (p - buf); | |
202 | p += dump_ioptable(obj, p, bytes); | |
203 | ||
204 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); | |
205 | ||
206 | mutex_unlock(&iommu_debug_lock); | |
207 | free_page((unsigned long)buf); | |
208 | ||
209 | return bytes; | |
210 | } | |
211 | ||
212 | static ssize_t debug_read_mmap(struct file *file, char __user *userbuf, | |
213 | size_t count, loff_t *ppos) | |
214 | { | |
6c32df43 | 215 | struct omap_iommu *obj = file->private_data; |
14e0e679 HD |
216 | char *p, *buf; |
217 | struct iovm_struct *tmp; | |
218 | int uninitialized_var(i); | |
219 | ssize_t bytes; | |
220 | ||
221 | buf = (char *)__get_free_page(GFP_KERNEL); | |
222 | if (!buf) | |
223 | return -ENOMEM; | |
224 | p = buf; | |
225 | ||
226 | p += sprintf(p, "%-3s %-8s %-8s %6s %8s\n", | |
227 | "No", "start", "end", "size", "flags"); | |
228 | p += sprintf(p, "-------------------------------------------------\n"); | |
229 | ||
230 | mutex_lock(&iommu_debug_lock); | |
231 | ||
232 | list_for_each_entry(tmp, &obj->mmap, list) { | |
233 | size_t len; | |
234 | const char *str = "%3d %08x-%08x %6x %8x\n"; | |
235 | const int maxcol = 39; | |
236 | ||
237 | len = tmp->da_end - tmp->da_start; | |
238 | p += snprintf(p, maxcol, str, | |
239 | i, tmp->da_start, tmp->da_end, len, tmp->flags); | |
240 | ||
241 | if (PAGE_SIZE - (p - buf) < maxcol) | |
242 | break; | |
243 | i++; | |
244 | } | |
245 | ||
246 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); | |
247 | ||
248 | mutex_unlock(&iommu_debug_lock); | |
249 | free_page((unsigned long)buf); | |
250 | ||
251 | return bytes; | |
252 | } | |
253 | ||
254 | static ssize_t debug_read_mem(struct file *file, char __user *userbuf, | |
255 | size_t count, loff_t *ppos) | |
256 | { | |
6c32df43 | 257 | struct omap_iommu *obj = file->private_data; |
14e0e679 HD |
258 | char *p, *buf; |
259 | struct iovm_struct *area; | |
260 | ssize_t bytes; | |
261 | ||
262 | count = min_t(ssize_t, count, PAGE_SIZE); | |
263 | ||
264 | buf = (char *)__get_free_page(GFP_KERNEL); | |
265 | if (!buf) | |
266 | return -ENOMEM; | |
267 | p = buf; | |
268 | ||
269 | mutex_lock(&iommu_debug_lock); | |
270 | ||
6c32df43 | 271 | area = omap_find_iovm_area(obj, (u32)ppos); |
14e0e679 HD |
272 | if (IS_ERR(area)) { |
273 | bytes = -EINVAL; | |
274 | goto err_out; | |
275 | } | |
276 | memcpy(p, area->va, count); | |
277 | p += count; | |
278 | ||
279 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); | |
280 | err_out: | |
281 | mutex_unlock(&iommu_debug_lock); | |
282 | free_page((unsigned long)buf); | |
283 | ||
284 | return bytes; | |
285 | } | |
286 | ||
287 | static ssize_t debug_write_mem(struct file *file, const char __user *userbuf, | |
288 | size_t count, loff_t *ppos) | |
289 | { | |
6c32df43 | 290 | struct omap_iommu *obj = file->private_data; |
14e0e679 HD |
291 | struct iovm_struct *area; |
292 | char *p, *buf; | |
293 | ||
294 | count = min_t(size_t, count, PAGE_SIZE); | |
295 | ||
296 | buf = (char *)__get_free_page(GFP_KERNEL); | |
297 | if (!buf) | |
298 | return -ENOMEM; | |
299 | p = buf; | |
300 | ||
301 | mutex_lock(&iommu_debug_lock); | |
302 | ||
303 | if (copy_from_user(p, userbuf, count)) { | |
304 | count = -EFAULT; | |
305 | goto err_out; | |
306 | } | |
307 | ||
6c32df43 | 308 | area = omap_find_iovm_area(obj, (u32)ppos); |
14e0e679 HD |
309 | if (IS_ERR(area)) { |
310 | count = -EINVAL; | |
311 | goto err_out; | |
312 | } | |
313 | memcpy(area->va, p, count); | |
314 | err_out: | |
315 | mutex_unlock(&iommu_debug_lock); | |
316 | free_page((unsigned long)buf); | |
317 | ||
318 | return count; | |
319 | } | |
320 | ||
321 | static int debug_open_generic(struct inode *inode, struct file *file) | |
322 | { | |
323 | file->private_data = inode->i_private; | |
324 | return 0; | |
325 | } | |
326 | ||
327 | #define DEBUG_FOPS(name) \ | |
328 | static const struct file_operations debug_##name##_fops = { \ | |
329 | .open = debug_open_generic, \ | |
330 | .read = debug_read_##name, \ | |
331 | .write = debug_write_##name, \ | |
c0b0aca0 | 332 | .llseek = generic_file_llseek, \ |
14e0e679 HD |
333 | }; |
334 | ||
335 | #define DEBUG_FOPS_RO(name) \ | |
336 | static const struct file_operations debug_##name##_fops = { \ | |
337 | .open = debug_open_generic, \ | |
338 | .read = debug_read_##name, \ | |
c0b0aca0 | 339 | .llseek = generic_file_llseek, \ |
14e0e679 HD |
340 | }; |
341 | ||
342 | DEBUG_FOPS_RO(ver); | |
343 | DEBUG_FOPS_RO(regs); | |
344 | DEBUG_FOPS_RO(tlb); | |
345 | DEBUG_FOPS(pagetable); | |
346 | DEBUG_FOPS_RO(mmap); | |
347 | DEBUG_FOPS(mem); | |
348 | ||
349 | #define __DEBUG_ADD_FILE(attr, mode) \ | |
350 | { \ | |
351 | struct dentry *dent; \ | |
352 | dent = debugfs_create_file(#attr, mode, parent, \ | |
353 | obj, &debug_##attr##_fops); \ | |
354 | if (!dent) \ | |
355 | return -ENOMEM; \ | |
356 | } | |
357 | ||
358 | #define DEBUG_ADD_FILE(name) __DEBUG_ADD_FILE(name, 600) | |
359 | #define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 400) | |
360 | ||
361 | static int iommu_debug_register(struct device *dev, void *data) | |
362 | { | |
363 | struct platform_device *pdev = to_platform_device(dev); | |
6c32df43 | 364 | struct omap_iommu *obj = platform_get_drvdata(pdev); |
14e0e679 HD |
365 | struct dentry *d, *parent; |
366 | ||
367 | if (!obj || !obj->dev) | |
368 | return -EINVAL; | |
369 | ||
370 | d = debugfs_create_dir(obj->name, iommu_debug_root); | |
371 | if (!d) | |
372 | return -ENOMEM; | |
373 | parent = d; | |
374 | ||
375 | d = debugfs_create_u8("nr_tlb_entries", 400, parent, | |
376 | (u8 *)&obj->nr_tlb_entries); | |
377 | if (!d) | |
378 | return -ENOMEM; | |
379 | ||
380 | DEBUG_ADD_FILE_RO(ver); | |
381 | DEBUG_ADD_FILE_RO(regs); | |
382 | DEBUG_ADD_FILE_RO(tlb); | |
383 | DEBUG_ADD_FILE(pagetable); | |
384 | DEBUG_ADD_FILE_RO(mmap); | |
385 | DEBUG_ADD_FILE(mem); | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | static int __init iommu_debug_init(void) | |
391 | { | |
392 | struct dentry *d; | |
393 | int err; | |
394 | ||
395 | d = debugfs_create_dir("iommu", NULL); | |
396 | if (!d) | |
397 | return -ENOMEM; | |
398 | iommu_debug_root = d; | |
399 | ||
6c32df43 | 400 | err = omap_foreach_iommu_device(d, iommu_debug_register); |
14e0e679 HD |
401 | if (err) |
402 | goto err_out; | |
403 | return 0; | |
404 | ||
405 | err_out: | |
406 | debugfs_remove_recursive(iommu_debug_root); | |
407 | return err; | |
408 | } | |
409 | module_init(iommu_debug_init) | |
410 | ||
411 | static void __exit iommu_debugfs_exit(void) | |
412 | { | |
413 | debugfs_remove_recursive(iommu_debug_root); | |
414 | } | |
415 | module_exit(iommu_debugfs_exit) | |
416 | ||
417 | MODULE_DESCRIPTION("omap iommu: debugfs interface"); | |
418 | MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>"); | |
419 | MODULE_LICENSE("GPL v2"); |