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14e0e679 HD |
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> | |
14e0e679 | 14 | #include <linux/io.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
14e0e679 | 16 | #include <linux/uaccess.h> |
69c2c196 | 17 | #include <linux/pm_runtime.h> |
14e0e679 | 18 | #include <linux/debugfs.h> |
2ab7c848 | 19 | #include <linux/platform_data/iommu-omap.h> |
14e0e679 | 20 | |
2f7702af | 21 | #include "omap-iopgtable.h" |
ed1c7de2 | 22 | #include "omap-iommu.h" |
14e0e679 | 23 | |
14e0e679 HD |
24 | static DEFINE_MUTEX(iommu_debug_lock); |
25 | ||
26 | static struct dentry *iommu_debug_root; | |
27 | ||
c5cf5c53 SA |
28 | static inline bool is_omap_iommu_detached(struct omap_iommu *obj) |
29 | { | |
30 | return !obj->domain; | |
31 | } | |
32 | ||
69c2c196 SA |
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 | ||
14e0e679 HD |
86 | static ssize_t debug_read_regs(struct file *file, char __user *userbuf, |
87 | size_t count, loff_t *ppos) | |
88 | { | |
61c75352 | 89 | struct omap_iommu *obj = file->private_data; |
14e0e679 HD |
90 | char *p, *buf; |
91 | ssize_t bytes; | |
92 | ||
c5cf5c53 SA |
93 | if (is_omap_iommu_detached(obj)) |
94 | return -EPERM; | |
95 | ||
14e0e679 HD |
96 | buf = kmalloc(count, GFP_KERNEL); |
97 | if (!buf) | |
98 | return -ENOMEM; | |
99 | p = buf; | |
100 | ||
101 | mutex_lock(&iommu_debug_lock); | |
102 | ||
6c32df43 | 103 | bytes = omap_iommu_dump_ctx(obj, p, count); |
14e0e679 HD |
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 | ||
69c2c196 SA |
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, | |
e203db29 | 136 | struct seq_file *s) |
69c2c196 | 137 | { |
e203db29 SP |
138 | return seq_printf(s, "%08x %08x %01x\n", cr->cam, cr->ram, |
139 | (cr->cam & MMU_CAM_P) ? 1 : 0); | |
69c2c196 SA |
140 | } |
141 | ||
e203db29 | 142 | static size_t omap_dump_tlb_entries(struct omap_iommu *obj, struct seq_file *s) |
69c2c196 SA |
143 | { |
144 | int i, num; | |
145 | struct cr_regs *cr; | |
69c2c196 | 146 | |
e203db29 | 147 | num = obj->nr_tlb_entries; |
69c2c196 SA |
148 | |
149 | cr = kcalloc(num, sizeof(*cr), GFP_KERNEL); | |
150 | if (!cr) | |
151 | return 0; | |
152 | ||
153 | num = __dump_tlb_entries(obj, cr, num); | |
154 | for (i = 0; i < num; i++) | |
e203db29 | 155 | iotlb_dump_cr(obj, cr + i, s); |
69c2c196 SA |
156 | kfree(cr); |
157 | ||
e203db29 | 158 | return 0; |
69c2c196 SA |
159 | } |
160 | ||
e203db29 | 161 | static int debug_read_tlb(struct seq_file *s, void *data) |
14e0e679 | 162 | { |
e203db29 | 163 | struct omap_iommu *obj = s->private; |
14e0e679 | 164 | |
c5cf5c53 SA |
165 | if (is_omap_iommu_detached(obj)) |
166 | return -EPERM; | |
167 | ||
14e0e679 HD |
168 | mutex_lock(&iommu_debug_lock); |
169 | ||
e203db29 SP |
170 | seq_printf(s, "%8s %8s\n", "cam:", "ram:"); |
171 | seq_puts(s, "-----------------------------------------\n"); | |
172 | omap_dump_tlb_entries(obj, s); | |
14e0e679 HD |
173 | |
174 | mutex_unlock(&iommu_debug_lock); | |
14e0e679 | 175 | |
e203db29 | 176 | return 0; |
14e0e679 HD |
177 | } |
178 | ||
9c83e9f3 | 179 | static void dump_ioptable(struct seq_file *s) |
14e0e679 | 180 | { |
9c83e9f3 SA |
181 | int i, j; |
182 | u32 da; | |
183 | u32 *iopgd, *iopte; | |
184 | struct omap_iommu *obj = s->private; | |
14e0e679 HD |
185 | |
186 | spin_lock(&obj->page_table_lock); | |
187 | ||
188 | iopgd = iopgd_offset(obj, 0); | |
189 | for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) { | |
14e0e679 HD |
190 | if (!*iopgd) |
191 | continue; | |
192 | ||
193 | if (!(*iopgd & IOPGD_TABLE)) { | |
194 | da = i << IOPGD_SHIFT; | |
9c83e9f3 | 195 | seq_printf(s, "1: 0x%08x 0x%08x\n", da, *iopgd); |
14e0e679 HD |
196 | continue; |
197 | } | |
198 | ||
199 | iopte = iopte_offset(iopgd, 0); | |
14e0e679 HD |
200 | for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) { |
201 | if (!*iopte) | |
202 | continue; | |
203 | ||
204 | da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT); | |
9c83e9f3 | 205 | seq_printf(s, "2: 0x%08x 0x%08x\n", da, *iopte); |
14e0e679 HD |
206 | } |
207 | } | |
14e0e679 | 208 | |
9c83e9f3 | 209 | spin_unlock(&obj->page_table_lock); |
14e0e679 HD |
210 | } |
211 | ||
9c83e9f3 | 212 | static int debug_read_pagetable(struct seq_file *s, void *data) |
14e0e679 | 213 | { |
9c83e9f3 | 214 | struct omap_iommu *obj = s->private; |
14e0e679 | 215 | |
c5cf5c53 SA |
216 | if (is_omap_iommu_detached(obj)) |
217 | return -EPERM; | |
218 | ||
14e0e679 HD |
219 | mutex_lock(&iommu_debug_lock); |
220 | ||
9c83e9f3 SA |
221 | seq_printf(s, "L: %8s %8s\n", "da:", "pte:"); |
222 | seq_puts(s, "--------------------------\n"); | |
223 | dump_ioptable(s); | |
14e0e679 HD |
224 | |
225 | mutex_unlock(&iommu_debug_lock); | |
14e0e679 | 226 | |
9c83e9f3 | 227 | return 0; |
14e0e679 HD |
228 | } |
229 | ||
9c83e9f3 SA |
230 | #define DEBUG_SEQ_FOPS_RO(name) \ |
231 | static int debug_open_##name(struct inode *inode, struct file *file) \ | |
232 | { \ | |
233 | return single_open(file, debug_read_##name, inode->i_private); \ | |
234 | } \ | |
235 | \ | |
236 | static const struct file_operations debug_##name##_fops = { \ | |
237 | .open = debug_open_##name, \ | |
238 | .read = seq_read, \ | |
239 | .llseek = seq_lseek, \ | |
240 | .release = single_release, \ | |
241 | } | |
242 | ||
14e0e679 HD |
243 | #define DEBUG_FOPS_RO(name) \ |
244 | static const struct file_operations debug_##name##_fops = { \ | |
234e3405 | 245 | .open = simple_open, \ |
14e0e679 | 246 | .read = debug_read_##name, \ |
c0b0aca0 | 247 | .llseek = generic_file_llseek, \ |
5b39a37a | 248 | } |
14e0e679 | 249 | |
14e0e679 | 250 | DEBUG_FOPS_RO(regs); |
e203db29 | 251 | DEBUG_SEQ_FOPS_RO(tlb); |
9c83e9f3 | 252 | DEBUG_SEQ_FOPS_RO(pagetable); |
14e0e679 HD |
253 | |
254 | #define __DEBUG_ADD_FILE(attr, mode) \ | |
255 | { \ | |
256 | struct dentry *dent; \ | |
61c75352 SA |
257 | dent = debugfs_create_file(#attr, mode, obj->debug_dir, \ |
258 | obj, &debug_##attr##_fops); \ | |
14e0e679 | 259 | if (!dent) \ |
61c75352 | 260 | goto err; \ |
14e0e679 HD |
261 | } |
262 | ||
ff3a2b73 | 263 | #define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 0400) |
14e0e679 | 264 | |
61c75352 | 265 | void omap_iommu_debugfs_add(struct omap_iommu *obj) |
14e0e679 | 266 | { |
61c75352 | 267 | struct dentry *d; |
46451d62 | 268 | |
61c75352 SA |
269 | if (!iommu_debug_root) |
270 | return; | |
46451d62 | 271 | |
61c75352 SA |
272 | obj->debug_dir = debugfs_create_dir(obj->name, iommu_debug_root); |
273 | if (!obj->debug_dir) | |
274 | return; | |
14e0e679 | 275 | |
61c75352 | 276 | d = debugfs_create_u8("nr_tlb_entries", 0400, obj->debug_dir, |
14e0e679 HD |
277 | (u8 *)&obj->nr_tlb_entries); |
278 | if (!d) | |
61c75352 | 279 | return; |
14e0e679 | 280 | |
14e0e679 HD |
281 | DEBUG_ADD_FILE_RO(regs); |
282 | DEBUG_ADD_FILE_RO(tlb); | |
3ca5db07 | 283 | DEBUG_ADD_FILE_RO(pagetable); |
14e0e679 | 284 | |
61c75352 | 285 | return; |
46451d62 | 286 | |
61c75352 SA |
287 | err: |
288 | debugfs_remove_recursive(obj->debug_dir); | |
46451d62 OBC |
289 | } |
290 | ||
61c75352 | 291 | void omap_iommu_debugfs_remove(struct omap_iommu *obj) |
46451d62 | 292 | { |
61c75352 SA |
293 | if (!obj->debug_dir) |
294 | return; | |
46451d62 | 295 | |
61c75352 | 296 | debugfs_remove_recursive(obj->debug_dir); |
14e0e679 HD |
297 | } |
298 | ||
61c75352 | 299 | void __init omap_iommu_debugfs_init(void) |
14e0e679 | 300 | { |
61c75352 SA |
301 | iommu_debug_root = debugfs_create_dir("omap_iommu", NULL); |
302 | if (!iommu_debug_root) | |
303 | pr_err("can't create debugfs dir\n"); | |
14e0e679 | 304 | } |
14e0e679 | 305 | |
61c75352 | 306 | void __exit omap_iommu_debugfs_exit(void) |
14e0e679 | 307 | { |
61c75352 | 308 | debugfs_remove(iommu_debug_root); |
14e0e679 | 309 | } |