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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 bytes = snprintf(p, maxcol, str, __stringify(name), \
36 iommu_read_reg(obj, MMU_##name)); \
37 p += bytes; \
38 len -= bytes; \
39 if (len < maxcol) \
40 goto out; \
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}
275
