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 | |
21 | static DEFINE_MUTEX(iommu_debug_lock); |
22 | |
23 | static struct dentry *iommu_debug_root; |
24 | |
25 | static 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 | |
43 | static ssize_t |
44 | omap2_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); |
64 | out: |
65 | return p - buf; |
66 | } |
67 | |
68 | static 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(dev: obj->dev); |
75 | |
76 | bytes = omap2_iommu_dump_ctx(obj, buf, len: bytes); |
77 | |
78 | pm_runtime_put_sync(dev: obj->dev); |
79 | |
80 | return bytes; |
81 | } |
82 | |
83 | static 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(size: 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, buf: p, bytes: count); |
101 | if (bytes < 0) |
102 | goto err; |
103 | bytes = simple_read_from_buffer(to: userbuf, count, ppos, from: buf, available: bytes); |
104 | |
105 | err: |
106 | mutex_unlock(lock: &iommu_debug_lock); |
107 | kfree(objp: 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(dev: obj->dev); |
121 | iotlb_lock_get(obj, l: &saved); |
122 | |
123 | for_each_iotlb_cr(obj, num, i, tmp) { |
124 | if (!iotlb_cr_valid(cr: &tmp)) |
125 | continue; |
126 | *p++ = tmp; |
127 | } |
128 | |
129 | iotlb_lock_set(obj, l: &saved); |
130 | pm_runtime_put_sync(dev: 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(m: s, fmt: "%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(n: num, size: sizeof(*cr), GFP_KERNEL); |
151 | if (!cr) |
152 | return 0; |
153 | |
154 | num = __dump_tlb_entries(obj, crs: cr, num); |
155 | for (i = 0; i < num; i++) |
156 | iotlb_dump_cr(obj, cr: cr + i, s); |
157 | kfree(objp: cr); |
158 | |
159 | return 0; |
160 | } |
161 | |
162 | static 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(m: s, fmt: "%8s %8s\n" , "cam:" , "ram:" ); |
172 | seq_puts(m: s, s: "-----------------------------------------\n" ); |
173 | omap_dump_tlb_entries(obj, s); |
174 | |
175 | mutex_unlock(lock: &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(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(m: s, fmt: "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(m: s, fmt: "2: 0x%08x 0x%08x\n" , da, *iopte); |
207 | } |
208 | } |
209 | |
210 | spin_unlock(lock: &obj->page_table_lock); |
211 | } |
212 | |
213 | static 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(m: s, fmt: "L: %8s %8s\n" , "da:" , "pte:" ); |
223 | seq_puts(m: s, s: "--------------------------\n" ); |
224 | dump_ioptable(s); |
225 | |
226 | mutex_unlock(lock: &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 | |
238 | DEBUG_FOPS_RO(regs); |
239 | DEFINE_SHOW_ATTRIBUTE(tlb); |
240 | DEFINE_SHOW_ATTRIBUTE(pagetable); |
241 | |
242 | void 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(name: obj->name, parent: iommu_debug_root); |
250 | obj->debug_dir = d; |
251 | |
252 | debugfs_create_u32(name: "nr_tlb_entries" , mode: 0400, parent: d, value: &obj->nr_tlb_entries); |
253 | debugfs_create_file(name: "regs" , mode: 0400, parent: d, data: obj, fops: ®s_fops); |
254 | debugfs_create_file(name: "tlb" , mode: 0400, parent: d, data: obj, fops: &tlb_fops); |
255 | debugfs_create_file(name: "pagetable" , mode: 0400, parent: d, data: obj, fops: &pagetable_fops); |
256 | } |
257 | |
258 | void omap_iommu_debugfs_remove(struct omap_iommu *obj) |
259 | { |
260 | if (!obj->debug_dir) |
261 | return; |
262 | |
263 | debugfs_remove_recursive(dentry: obj->debug_dir); |
264 | } |
265 | |
266 | void __init omap_iommu_debugfs_init(void) |
267 | { |
268 | iommu_debug_root = debugfs_create_dir(name: "omap_iommu" , NULL); |
269 | } |
270 | |
271 | void __exit omap_iommu_debugfs_exit(void) |
272 | { |
273 | debugfs_remove(dentry: iommu_debug_root); |
274 | } |
275 | |