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-rw-r--r--arch/arm/plat-omap/iommu-debug.c415
1 files changed, 415 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/iommu-debug.c b/arch/arm/plat-omap/iommu-debug.c
new file mode 100644
index 000000000000..c799b3b0d709
--- /dev/null
+++ b/arch/arm/plat-omap/iommu-debug.c
@@ -0,0 +1,415 @@
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
27static DEFINE_MUTEX(iommu_debug_lock);
28
29static struct dentry *iommu_debug_root;
30
31static 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
42static 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
65static 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
92static 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
138static 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 }
176out:
177 spin_unlock(&obj->page_table_lock);
178
179 return p - buf;
180}
181
182static 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
210static 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
252static 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);
278err_out:
279 mutex_unlock(&iommu_debug_lock);
280 free_page((unsigned long)buf);
281
282 return bytes;
283}
284
285static 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);
312err_out:
313 mutex_unlock(&iommu_debug_lock);
314 free_page((unsigned long)buf);
315
316 return count;
317}
318
319static 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
338DEBUG_FOPS_RO(ver);
339DEBUG_FOPS_RO(regs);
340DEBUG_FOPS_RO(tlb);
341DEBUG_FOPS(pagetable);
342DEBUG_FOPS_RO(mmap);
343DEBUG_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
357static 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
386static 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
401err_out:
402 debugfs_remove_recursive(iommu_debug_root);
403 return err;
404}
405module_init(iommu_debug_init)
406
407static void __exit iommu_debugfs_exit(void)
408{
409 debugfs_remove_recursive(iommu_debug_root);
410}
411module_exit(iommu_debugfs_exit)
412
413MODULE_DESCRIPTION("omap iommu: debugfs interface");
414MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
415MODULE_LICENSE("GPL v2");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-25 20:55:36 -0500