Merge branch 'pcmcia' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia
[sfrench/cifs-2.6.git] / drivers / iommu / omap-iommu-debug.c
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/io.h>
15 #include <linux/slab.h>
16 #include <linux/uaccess.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/debugfs.h>
19 #include <linux/platform_data/iommu-omap.h>
20
21 #include "omap-iopgtable.h"
22 #include "omap-iommu.h"
23
24 static DEFINE_MUTEX(iommu_debug_lock);
25
26 static struct dentry *iommu_debug_root;
27
28 static inline bool is_omap_iommu_detached(struct omap_iommu *obj)
29 {
30         return !obj->domain;
31 }
32
33 #define pr_reg(name)                                                    \
34         do {                                                            \
35                 ssize_t bytes;                                          \
36                 const char *str = "%20s: %08x\n";                       \
37                 const int maxcol = 32;                                  \
38                 bytes = snprintf(p, maxcol, str, __stringify(name),     \
39                                  iommu_read_reg(obj, MMU_##name));      \
40                 p += bytes;                                             \
41                 len -= bytes;                                           \
42                 if (len < maxcol)                                       \
43                         goto out;                                       \
44         } while (0)
45
46 static ssize_t
47 omap2_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len)
48 {
49         char *p = buf;
50
51         pr_reg(REVISION);
52         pr_reg(IRQSTATUS);
53         pr_reg(IRQENABLE);
54         pr_reg(WALKING_ST);
55         pr_reg(CNTL);
56         pr_reg(FAULT_AD);
57         pr_reg(TTB);
58         pr_reg(LOCK);
59         pr_reg(LD_TLB);
60         pr_reg(CAM);
61         pr_reg(RAM);
62         pr_reg(GFLUSH);
63         pr_reg(FLUSH_ENTRY);
64         pr_reg(READ_CAM);
65         pr_reg(READ_RAM);
66         pr_reg(EMU_FAULT_AD);
67 out:
68         return p - buf;
69 }
70
71 static ssize_t omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf,
72                                    ssize_t bytes)
73 {
74         if (!obj || !buf)
75                 return -EINVAL;
76
77         pm_runtime_get_sync(obj->dev);
78
79         bytes = omap2_iommu_dump_ctx(obj, buf, bytes);
80
81         pm_runtime_put_sync(obj->dev);
82
83         return bytes;
84 }
85
86 static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
87                                size_t count, loff_t *ppos)
88 {
89         struct omap_iommu *obj = file->private_data;
90         char *p, *buf;
91         ssize_t bytes;
92
93         if (is_omap_iommu_detached(obj))
94                 return -EPERM;
95
96         buf = kmalloc(count, GFP_KERNEL);
97         if (!buf)
98                 return -ENOMEM;
99         p = buf;
100
101         mutex_lock(&iommu_debug_lock);
102
103         bytes = omap_iommu_dump_ctx(obj, p, count);
104         bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes);
105
106         mutex_unlock(&iommu_debug_lock);
107         kfree(buf);
108
109         return bytes;
110 }
111
112 static 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
135 static 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
143 static 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
162 static int debug_read_tlb(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
180 static 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
213 static int debug_read_pagetable(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_SEQ_FOPS_RO(name)                                                \
232         static int debug_open_##name(struct inode *inode, struct file *file)   \
233         {                                                                      \
234                 return single_open(file, debug_read_##name, inode->i_private); \
235         }                                                                      \
236                                                                                \
237         static const struct file_operations debug_##name##_fops = {            \
238                 .open           = debug_open_##name,                           \
239                 .read           = seq_read,                                    \
240                 .llseek         = seq_lseek,                                   \
241                 .release        = single_release,                              \
242         }
243
244 #define DEBUG_FOPS_RO(name)                                             \
245         static const struct file_operations debug_##name##_fops = {     \
246                 .open = simple_open,                                    \
247                 .read = debug_read_##name,                              \
248                 .llseek = generic_file_llseek,                          \
249         }
250
251 DEBUG_FOPS_RO(regs);
252 DEBUG_SEQ_FOPS_RO(tlb);
253 DEBUG_SEQ_FOPS_RO(pagetable);
254
255 #define __DEBUG_ADD_FILE(attr, mode)                                    \
256         {                                                               \
257                 struct dentry *dent;                                    \
258                 dent = debugfs_create_file(#attr, mode, obj->debug_dir, \
259                                            obj, &debug_##attr##_fops);  \
260                 if (!dent)                                              \
261                         goto err;                                       \
262         }
263
264 #define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 0400)
265
266 void omap_iommu_debugfs_add(struct omap_iommu *obj)
267 {
268         struct dentry *d;
269
270         if (!iommu_debug_root)
271                 return;
272
273         obj->debug_dir = debugfs_create_dir(obj->name, iommu_debug_root);
274         if (!obj->debug_dir)
275                 return;
276
277         d = debugfs_create_u8("nr_tlb_entries", 0400, obj->debug_dir,
278                               (u8 *)&obj->nr_tlb_entries);
279         if (!d)
280                 return;
281
282         DEBUG_ADD_FILE_RO(regs);
283         DEBUG_ADD_FILE_RO(tlb);
284         DEBUG_ADD_FILE_RO(pagetable);
285
286         return;
287
288 err:
289         debugfs_remove_recursive(obj->debug_dir);
290 }
291
292 void omap_iommu_debugfs_remove(struct omap_iommu *obj)
293 {
294         if (!obj->debug_dir)
295                 return;
296
297         debugfs_remove_recursive(obj->debug_dir);
298 }
299
300 void __init omap_iommu_debugfs_init(void)
301 {
302         iommu_debug_root = debugfs_create_dir("omap_iommu", NULL);
303         if (!iommu_debug_root)
304                 pr_err("can't create debugfs dir\n");
305 }
306
307 void __exit omap_iommu_debugfs_exit(void)
308 {
309         debugfs_remove(iommu_debug_root);
310 }