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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 bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes);
102
103 mutex_unlock(&iommu_debug_lock);
104 kfree(buf);
105
106 return bytes;
107}
108
109static int
110__dump_tlb_entries(struct omap_iommu *obj, struct cr_regs *crs, int num)
111{
112 int i;
113 struct iotlb_lock saved;
114 struct cr_regs tmp;
115 struct cr_regs *p = crs;
116
117 pm_runtime_get_sync(obj->dev);
118 iotlb_lock_get(obj, &saved);
119
120 for_each_iotlb_cr(obj, num, i, tmp) {
121 if (!iotlb_cr_valid(&tmp))
122 continue;
123 *p++ = tmp;
124 }
125
126 iotlb_lock_set(obj, &saved);
127 pm_runtime_put_sync(obj->dev);
128
129 return p - crs;
130}
131
132static ssize_t iotlb_dump_cr(struct omap_iommu *obj, struct cr_regs *cr,
133 struct seq_file *s)
134{
135 seq_printf(s, "%08x %08x %01x\n", cr->cam, cr->ram,
136 (cr->cam & MMU_CAM_P) ? 1 : 0);
137 return 0;
138}
139
140static size_t omap_dump_tlb_entries(struct omap_iommu *obj, struct seq_file *s)
141{
142 int i, num;
143 struct cr_regs *cr;
144
145 num = obj->nr_tlb_entries;
146
147 cr = kcalloc(num, sizeof(*cr), GFP_KERNEL);
148 if (!cr)
149 return 0;
150
151 num = __dump_tlb_entries(obj, cr, num);
152 for (i = 0; i < num; i++)
153 iotlb_dump_cr(obj, cr + i, s);
154 kfree(cr);
155
156 return 0;
157}
158
159static int tlb_show(struct seq_file *s, void *data)
160{
161 struct omap_iommu *obj = s->private;
162
163 if (is_omap_iommu_detached(obj))
164 return -EPERM;
165
166 mutex_lock(&iommu_debug_lock);
167
168 seq_printf(s, "%8s %8s\n", "cam:", "ram:");
169 seq_puts(s, "-----------------------------------------\n");
170 omap_dump_tlb_entries(obj, s);
171
172 mutex_unlock(&iommu_debug_lock);
173
174 return 0;
175}
176
177static void dump_ioptable(struct seq_file *s)
178{
179 int i, j;
180 u32 da;
181 u32 *iopgd, *iopte;
182 struct omap_iommu *obj = s->private;
183
184 spin_lock(&obj->page_table_lock);
185
186 iopgd = iopgd_offset(obj, 0);
187 for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) {
188 if (!*iopgd)
189 continue;
190
191 if (!(*iopgd & IOPGD_TABLE)) {
192 da = i << IOPGD_SHIFT;
193 seq_printf(s, "1: 0x%08x 0x%08x\n", da, *iopgd);
194 continue;
195 }
196
197 iopte = iopte_offset(iopgd, 0);
198 for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) {
199 if (!*iopte)
200 continue;
201
202 da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT);
203 seq_printf(s, "2: 0x%08x 0x%08x\n", da, *iopte);
204 }
205 }
206
207 spin_unlock(&obj->page_table_lock);
208}
209
210static int pagetable_show(struct seq_file *s, void *data)
211{
212 struct omap_iommu *obj = s->private;
213
214 if (is_omap_iommu_detached(obj))
215 return -EPERM;
216
217 mutex_lock(&iommu_debug_lock);
218
219 seq_printf(s, "L: %8s %8s\n", "da:", "pte:");
220 seq_puts(s, "--------------------------\n");
221 dump_ioptable(s);
222
223 mutex_unlock(&iommu_debug_lock);
224
225 return 0;
226}
227
228#define DEBUG_FOPS_RO(name) \
229 static const struct file_operations name##_fops = { \
230 .open = simple_open, \
231 .read = debug_read_##name, \
232 .llseek = generic_file_llseek, \
233 }
234
235DEBUG_FOPS_RO(regs);
236DEFINE_SHOW_ATTRIBUTE(tlb);
237DEFINE_SHOW_ATTRIBUTE(pagetable);
238
239void omap_iommu_debugfs_add(struct omap_iommu *obj)
240{
241 struct dentry *d;
242
243 if (!iommu_debug_root)
244 return;
245
246 d = debugfs_create_dir(obj->name, iommu_debug_root);
247 obj->debug_dir = d;
248
249 debugfs_create_u32("nr_tlb_entries", 0400, d, &obj->nr_tlb_entries);
250 debugfs_create_file("regs", 0400, d, obj, ®s_fops);
251 debugfs_create_file("tlb", 0400, d, obj, &tlb_fops);
252 debugfs_create_file("pagetable", 0400, d, obj, &pagetable_fops);
253}
254
255void omap_iommu_debugfs_remove(struct omap_iommu *obj)
256{
257 if (!obj->debug_dir)
258 return;
259
260 debugfs_remove_recursive(obj->debug_dir);
261}
262
263void __init omap_iommu_debugfs_init(void)
264{
265 iommu_debug_root = debugfs_create_dir("omap_iommu", NULL);
266}
267
268void __exit omap_iommu_debugfs_exit(void)
269{
270 debugfs_remove(iommu_debug_root);
271}
272
