summaryrefslogtreecommitdiffstats
path: root/drivers/iommu/omap-iommu-debug.c
blob: 80fffba7f12dfd77dcff90d06a9783613d131827 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
/*
 * omap iommu: debugfs interface
 *
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/debugfs.h>
#include <linux/omap-iommu.h>
#include <linux/platform_data/iommu-omap.h>

#include "omap-iopgtable.h"
#include "omap-iommu.h"

#define MAXCOLUMN 100 /* for short messages */

static DEFINE_MUTEX(iommu_debug_lock);

static struct dentry *iommu_debug_root;

static ssize_t debug_read_ver(struct file *file, char __user *userbuf,
			      size_t count, loff_t *ppos)
{
	u32 ver = omap_iommu_arch_version();
	char buf[MAXCOLUMN], *p = buf;

	p += sprintf(p, "H/W version: %d.%d\n", (ver >> 4) & 0xf , ver & 0xf);

	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
}

static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
			       size_t count, loff_t *ppos)
{
	struct device *dev = file->private_data;
	struct omap_iommu *obj = dev_to_omap_iommu(dev);
	char *p, *buf;
	ssize_t bytes;

	buf = kmalloc(count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	p = buf;

	mutex_lock(&iommu_debug_lock);

	bytes = omap_iommu_dump_ctx(obj, p, count);
	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes);

	mutex_unlock(&iommu_debug_lock);
	kfree(buf);

	return bytes;
}

static ssize_t debug_read_tlb(struct file *file, char __user *userbuf,
			      size_t count, loff_t *ppos)
{
	struct device *dev = file->private_data;
	struct omap_iommu *obj = dev_to_omap_iommu(dev);
	char *p, *buf;
	ssize_t bytes, rest;

	buf = kmalloc(count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	p = buf;

	mutex_lock(&iommu_debug_lock);

	p += sprintf(p, "%8s %8s\n", "cam:", "ram:");
	p += sprintf(p, "-----------------------------------------\n");
	rest = count - (p - buf);
	p += omap_dump_tlb_entries(obj, p, rest);

	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);

	mutex_unlock(&iommu_debug_lock);
	kfree(buf);

	return bytes;
}

static ssize_t debug_write_pagetable(struct file *file,
		     const char __user *userbuf, size_t count, loff_t *ppos)
{
	struct iotlb_entry e;
	struct cr_regs cr;
	int err;
	struct device *dev = file->private_data;
	struct omap_iommu *obj = dev_to_omap_iommu(dev);
	char buf[MAXCOLUMN], *p = buf;

	count = min(count, sizeof(buf));

	mutex_lock(&iommu_debug_lock);
	if (copy_from_user(p, userbuf, count)) {
		mutex_unlock(&iommu_debug_lock);
		return -EFAULT;
	}

	sscanf(p, "%x %x", &cr.cam, &cr.ram);
	if (!cr.cam || !cr.ram) {
		mutex_unlock(&iommu_debug_lock);
		return -EINVAL;
	}

	omap_iotlb_cr_to_e(&cr, &e);
	err = omap_iopgtable_store_entry(obj, &e);
	if (err)
		dev_err(obj->dev, "%s: fail to store cr\n", __func__);

	mutex_unlock(&iommu_debug_lock);
	return count;
}

#define dump_ioptable_entry_one(lv, da, val)			\
	({							\
		int __err = 0;					\
		ssize_t bytes;					\
		const int maxcol = 22;				\
		const char *str = "%d: %08x %08x\n";		\
		bytes = snprintf(p, maxcol, str, lv, da, val);	\
		p += bytes;					\
		len -= bytes;					\
		if (len < maxcol)				\
			__err = -ENOMEM;			\
		__err;						\
	})

static ssize_t dump_ioptable(struct omap_iommu *obj, char *buf, ssize_t len)
{
	int i;
	u32 *iopgd;
	char *p = buf;

	spin_lock(&obj->page_table_lock);

	iopgd = iopgd_offset(obj, 0);
	for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) {
		int j, err;
		u32 *iopte;
		u32 da;

		if (!*iopgd)
			continue;

		if (!(*iopgd & IOPGD_TABLE)) {
			da = i << IOPGD_SHIFT;

			err = dump_ioptable_entry_one(1, da, *iopgd);
			if (err)
				goto out;
			continue;
		}

		iopte = iopte_offset(iopgd, 0);

		for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) {
			if (!*iopte)
				continue;

			da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT);
			err = dump_ioptable_entry_one(2, da, *iopgd);
			if (err)
				goto out;
		}
	}
out:
	spin_unlock(&obj->page_table_lock);

	return p - buf;
}

static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf,
				    size_t count, loff_t *ppos)
{
	struct device *dev = file->private_data;
	struct omap_iommu *obj = dev_to_omap_iommu(dev);
	char *p, *buf;
	size_t bytes;

	buf = (char *)__get_free_page(GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	p = buf;

	p += sprintf(p, "L: %8s %8s\n", "da:", "pa:");
	p += sprintf(p, "-----------------------------------------\n");

	mutex_lock(&iommu_debug_lock);

	bytes = PAGE_SIZE - (p - buf);
	p += dump_ioptable(obj, p, bytes);

	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);

	mutex_unlock(&iommu_debug_lock);
	free_page((unsigned long)buf);

	return bytes;
}

static ssize_t debug_read_mmap(struct file *file, char __user *userbuf,
			       size_t count, loff_t *ppos)
{
	struct device *dev = file->private_data;
	struct omap_iommu *obj = dev_to_omap_iommu(dev);
	char *p, *buf;
	struct iovm_struct *tmp;
	int uninitialized_var(i);
	ssize_t bytes;

	buf = (char *)__get_free_page(GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	p = buf;

	p += sprintf(p, "%-3s %-8s %-8s %6s %8s\n",
		     "No", "start", "end", "size", "flags");
	p += sprintf(p, "-------------------------------------------------\n");

	mutex_lock(&iommu_debug_lock);

	list_for_each_entry(tmp, &obj->mmap, list) {
		size_t len;
		const char *str = "%3d %08x-%08x %6x %8x\n";
		const int maxcol = 39;

		len = tmp->da_end - tmp->da_start;
		p += snprintf(p, maxcol, str,
			      i, tmp->da_start, tmp->da_end, len, tmp->flags);

		if (PAGE_SIZE - (p - buf) < maxcol)
			break;
		i++;
	}

	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);

	mutex_unlock(&iommu_debug_lock);
	free_page((unsigned long)buf);

	return bytes;
}

static ssize_t debug_read_mem(struct file *file, char __user *userbuf,
			      size_t count, loff_t *ppos)
{
	struct device *dev = file->private_data;
	char *p, *buf;
	struct iovm_struct *area;
	ssize_t bytes;

	count = min_t(ssize_t, count, PAGE_SIZE);

	buf = (char *)__get_free_page(GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	p = buf;

	mutex_lock(&iommu_debug_lock);

	area = omap_find_iovm_area(dev, (u32)ppos);
	if (!area) {
		bytes = -EINVAL;
		goto err_out;
	}
	memcpy(p, area->va, count);
	p += count;

	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
err_out:
	mutex_unlock(&iommu_debug_lock);
	free_page((unsigned long)buf);

	return bytes;
}

static ssize_t debug_write_mem(struct file *file, const char __user *userbuf,
			       size_t count, loff_t *ppos)
{
	struct device *dev = file->private_data;
	struct iovm_struct *area;
	char *p, *buf;

	count = min_t(size_t, count, PAGE_SIZE);

	buf = (char *)__get_free_page(GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	p = buf;

	mutex_lock(&iommu_debug_lock);

	if (copy_from_user(p, userbuf, count)) {
		count =  -EFAULT;
		goto err_out;
	}

	area = omap_find_iovm_area(dev, (u32)ppos);
	if (!area) {
		count = -EINVAL;
		goto err_out;
	}
	memcpy(area->va, p, count);
err_out:
	mutex_unlock(&iommu_debug_lock);
	free_page((unsigned long)buf);

	return count;
}

#define DEBUG_FOPS(name)						\
	static const struct file_operations debug_##name##_fops = {	\
		.open = simple_open,					\
		.read = debug_read_##name,				\
		.write = debug_write_##name,				\
		.llseek = generic_file_llseek,				\
	};

#define DEBUG_FOPS_RO(name)						\
	static const struct file_operations debug_##name##_fops = {	\
		.open = simple_open,					\
		.read = debug_read_##name,				\
		.llseek = generic_file_llseek,				\
	};

DEBUG_FOPS_RO(ver);
DEBUG_FOPS_RO(regs);
DEBUG_FOPS_RO(tlb);
DEBUG_FOPS(pagetable);
DEBUG_FOPS_RO(mmap);
DEBUG_FOPS(mem);

#define __DEBUG_ADD_FILE(attr, mode)					\
	{								\
		struct dentry *dent;					\
		dent = debugfs_create_file(#attr, mode, parent,		\
					   dev, &debug_##attr##_fops);	\
		if (!dent)						\
			return -ENOMEM;					\
	}

#define DEBUG_ADD_FILE(name) __DEBUG_ADD_FILE(name, 0600)
#define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 0400)

static int iommu_debug_register(struct device *dev, void *data)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct omap_iommu *obj = platform_get_drvdata(pdev);
	struct omap_iommu_arch_data *arch_data;
	struct dentry *d, *parent;

	if (!obj || !obj->dev)
		return -EINVAL;

	arch_data = kzalloc(sizeof(*arch_data), GFP_KERNEL);
	if (!arch_data)
		return -ENOMEM;

	arch_data->iommu_dev = obj;

	dev->archdata.iommu = arch_data;

	d = debugfs_create_dir(obj->name, iommu_debug_root);
	if (!d)
		goto nomem;
	parent = d;

	d = debugfs_create_u8("nr_tlb_entries", 400, parent,
			      (u8 *)&obj->nr_tlb_entries);
	if (!d)
		goto nomem;

	DEBUG_ADD_FILE_RO(ver);
	DEBUG_ADD_FILE_RO(regs);
	DEBUG_ADD_FILE_RO(tlb);
	DEBUG_ADD_FILE(pagetable);
	DEBUG_ADD_FILE_RO(mmap);
	DEBUG_ADD_FILE(mem);

	return 0;

nomem:
	kfree(arch_data);
	return -ENOMEM;
}

static int iommu_debug_unregister(struct device *dev, void *data)
{
	if (!dev->archdata.iommu)
		return 0;

	kfree(dev->archdata.iommu);

	dev->archdata.iommu = NULL;

	return 0;
}

static int __init iommu_debug_init(void)
{
	struct dentry *d;
	int err;

	d = debugfs_create_dir("iommu", NULL);
	if (!d)
		return -ENOMEM;
	iommu_debug_root = d;

	err = omap_foreach_iommu_device(d, iommu_debug_register);
	if (err)
		goto err_out;
	return 0;

err_out:
	debugfs_remove_recursive(iommu_debug_root);
	return err;
}
module_init(iommu_debug_init)

static void __exit iommu_debugfs_exit(void)
{
	debugfs_remove_recursive(iommu_debug_root);
	omap_foreach_iommu_device(NULL, iommu_debug_unregister);
}
module_exit(iommu_debugfs_exit)

MODULE_DESCRIPTION("omap iommu: debugfs interface");
MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
MODULE_LICENSE("GPL v2");