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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * omap iommu: debugfs interface
4 *
5 * Copyright (C) 2008-2009 Nokia Corporation
6 *
7 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
8 */
9
10#include <linux/err.h>
11#include <linux/io.h>
12#include <linux/slab.h>
13#include <linux/uaccess.h>
14#include <linux/pm_runtime.h>
15#include <linux/debugfs.h>
16#include <linux/platform_data/iommu-omap.h>
17
18#include "omap-iopgtable.h"
19#include "omap-iommu.h"
20
21static DEFINE_MUTEX(iommu_debug_lock);
22
23static struct dentry *iommu_debug_root;
24
25static inline bool is_omap_iommu_detached(struct omap_iommu *obj)
26{
27 return !obj->domain;
28}
29
30#define pr_reg(name) \
31 do { \
32 ssize_t bytes; \
33 const char *str = "%20s: %08x\n"; \
34 const int maxcol = 32; \
35 if (len < maxcol) \
36 goto out; \
37 bytes = scnprintf(p, maxcol, str, __stringify(name), \
38 iommu_read_reg(obj, MMU_##name)); \
39 p += bytes; \
40 len -= bytes; \
41 } while (0)
42
43static ssize_t
44omap2_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len)
45{
46 char *p = buf;
47
48 pr_reg(REVISION);
49 pr_reg(IRQSTATUS);
50 pr_reg(IRQENABLE);
51 pr_reg(WALKING_ST);
52 pr_reg(CNTL);
53 pr_reg(FAULT_AD);
54 pr_reg(TTB);
55 pr_reg(LOCK);
56 pr_reg(LD_TLB);
57 pr_reg(CAM);
58 pr_reg(RAM);
59 pr_reg(GFLUSH);
60 pr_reg(FLUSH_ENTRY);
61 pr_reg(READ_CAM);
62 pr_reg(READ_RAM);
63 pr_reg(EMU_FAULT_AD);
64out:
65 return p - buf;
66}
67
68static ssize_t omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf,
69 ssize_t bytes)
70{
71 if (!obj || !buf)
72 return -EINVAL;
73
74 pm_runtime_get_sync(obj->dev);
75
76 bytes = omap2_iommu_dump_ctx(obj, buf, bytes);
77
78 pm_runtime_put_sync(obj->dev);
79
80 return bytes;
81}
82
83static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
84 size_t count, loff_t *ppos)
85{
86 struct omap_iommu *obj = file->private_data;
87 char *p, *buf;
88 ssize_t bytes;
89
90 if (is_omap_iommu_detached(obj))
91 return -EPERM;
92
93 buf = kmalloc(count, GFP_KERNEL);
94 if (!buf)
95 return -ENOMEM;
96 p = buf;
97
98 mutex_lock(&iommu_debug_lock);
99
100 bytes = omap_iommu_dump_ctx(obj, p, count);
101 if (bytes < 0)
102 goto err;
103 bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes);
104
105err:
106 mutex_unlock(&iommu_debug_lock);
107 kfree(buf);
108
109 return bytes;
110}
111
112static int
113__dump_tlb_entries(struct omap_iommu *obj, struct cr_regs *crs, int num)
114{
115 int i;
116 struct iotlb_lock saved;
117 struct cr_regs tmp;
118 struct cr_regs *p = crs;
119
120 pm_runtime_get_sync(obj->dev);
121 iotlb_lock_get(obj, &saved);
122
123 for_each_iotlb_cr(obj, num, i, tmp) {
124 if (!iotlb_cr_valid(&tmp))
125 continue;
126 *p++ = tmp;
127 }
128
129 iotlb_lock_set(obj, &saved);
130 pm_runtime_put_sync(obj->dev);
131
132 return p - crs;
133}
134
135static ssize_t iotlb_dump_cr(struct omap_iommu *obj, struct cr_regs *cr,
136 struct seq_file *s)
137{
138 seq_printf(s, "%08x %08x %01x\n", cr->cam, cr->ram,
139 (cr->cam & MMU_CAM_P) ? 1 : 0);
140 return 0;
141}
142
143static size_t omap_dump_tlb_entries(struct omap_iommu *obj, struct seq_file *s)
144{
145 int i, num;
146 struct cr_regs *cr;
147
148 num = obj->nr_tlb_entries;
149
150 cr = kcalloc(num, sizeof(*cr), GFP_KERNEL);
151 if (!cr)
152 return 0;
153
154 num = __dump_tlb_entries(obj, cr, num);
155 for (i = 0; i < num; i++)
156 iotlb_dump_cr(obj, cr + i, s);
157 kfree(cr);
158
159 return 0;
160}
161
162static int tlb_show(struct seq_file *s, void *data)
163{
164 struct omap_iommu *obj = s->private;
165
166 if (is_omap_iommu_detached(obj))
167 return -EPERM;
168
169 mutex_lock(&iommu_debug_lock);
170
171 seq_printf(s, "%8s %8s\n", "cam:", "ram:");
172 seq_puts(s, "-----------------------------------------\n");
173 omap_dump_tlb_entries(obj, s);
174
175 mutex_unlock(&iommu_debug_lock);
176
177 return 0;
178}
179
180static void dump_ioptable(struct seq_file *s)
181{
182 int i, j;
183 u32 da;
184 u32 *iopgd, *iopte;
185 struct omap_iommu *obj = s->private;
186
187 spin_lock(&obj->page_table_lock);
188
189 iopgd = iopgd_offset(obj, 0);
190 for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) {
191 if (!*iopgd)
192 continue;
193
194 if (!(*iopgd & IOPGD_TABLE)) {
195 da = i << IOPGD_SHIFT;
196 seq_printf(s, "1: 0x%08x 0x%08x\n", da, *iopgd);
197 continue;
198 }
199
200 iopte = iopte_offset(iopgd, 0);
201 for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) {
202 if (!*iopte)
203 continue;
204
205 da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT);
206 seq_printf(s, "2: 0x%08x 0x%08x\n", da, *iopte);
207 }
208 }
209
210 spin_unlock(&obj->page_table_lock);
211}
212
213static int pagetable_show(struct seq_file *s, void *data)
214{
215 struct omap_iommu *obj = s->private;
216
217 if (is_omap_iommu_detached(obj))
218 return -EPERM;
219
220 mutex_lock(&iommu_debug_lock);
221
222 seq_printf(s, "L: %8s %8s\n", "da:", "pte:");
223 seq_puts(s, "--------------------------\n");
224 dump_ioptable(s);
225
226 mutex_unlock(&iommu_debug_lock);
227
228 return 0;
229}
230
231#define DEBUG_FOPS_RO(name) \
232 static const struct file_operations name##_fops = { \
233 .open = simple_open, \
234 .read = debug_read_##name, \
235 .llseek = generic_file_llseek, \
236 }
237
238DEBUG_FOPS_RO(regs);
239DEFINE_SHOW_ATTRIBUTE(tlb);
240DEFINE_SHOW_ATTRIBUTE(pagetable);
241
242void omap_iommu_debugfs_add(struct omap_iommu *obj)
243{
244 struct dentry *d;
245
246 if (!iommu_debug_root)
247 return;
248
249 d = debugfs_create_dir(obj->name, iommu_debug_root);
250 obj->debug_dir = d;
251
252 debugfs_create_u32("nr_tlb_entries", 0400, d, &obj->nr_tlb_entries);
253 debugfs_create_file("regs", 0400, d, obj, ®s_fops);
254 debugfs_create_file("tlb", 0400, d, obj, &tlb_fops);
255 debugfs_create_file("pagetable", 0400, d, obj, &pagetable_fops);
256}
257
258void omap_iommu_debugfs_remove(struct omap_iommu *obj)
259{
260 if (!obj->debug_dir)
261 return;
262
263 debugfs_remove_recursive(obj->debug_dir);
264}
265
266void __init omap_iommu_debugfs_init(void)
267{
268 iommu_debug_root = debugfs_create_dir("omap_iommu", NULL);
269}
270
271void __exit omap_iommu_debugfs_exit(void)
272{
273 debugfs_remove(iommu_debug_root);
274}
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
22#include <plat/iommu.h>
23#include <plat/iovmm.h>
24
25#include <plat/iopgtable.h>
26
27#define MAXCOLUMN 100 /* for short messages */
28
29static DEFINE_MUTEX(iommu_debug_lock);
30
31static struct dentry *iommu_debug_root;
32
33static 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
44static 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
68static 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
96static 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
143static 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 }
181out:
182 spin_unlock(&obj->page_table_lock);
183
184 return p - buf;
185}
186
187static 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
216static 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
259static 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);
285err_out:
286 mutex_unlock(&iommu_debug_lock);
287 free_page((unsigned long)buf);
288
289 return bytes;
290}
291
292static 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);
319err_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
341DEBUG_FOPS_RO(ver);
342DEBUG_FOPS_RO(regs);
343DEBUG_FOPS_RO(tlb);
344DEBUG_FOPS(pagetable);
345DEBUG_FOPS_RO(mmap);
346DEBUG_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
360static 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
397nomem:
398 kfree(arch_data);
399 return -ENOMEM;
400}
401
402static 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
414static 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
429err_out:
430 debugfs_remove_recursive(iommu_debug_root);
431 return err;
432}
433module_init(iommu_debug_init)
434
435static void __exit iommu_debugfs_exit(void)
436{
437 debugfs_remove_recursive(iommu_debug_root);
438 omap_foreach_iommu_device(NULL, iommu_debug_unregister);
439}
440module_exit(iommu_debugfs_exit)
441
442MODULE_DESCRIPTION("omap iommu: debugfs interface");
443MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
444MODULE_LICENSE("GPL v2");