1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2010 Google, Inc.
4 * Author: Erik Gilling <konkers@android.com>
5 *
6 * Copyright (C) 2011-2013 NVIDIA Corporation
7 */
8
9 #include <linux/debugfs.h>
10 #include <linux/pm_runtime.h>
11 #include <linux/seq_file.h>
12 #include <linux/uaccess.h>
13
14 #include <linux/io.h>
15
16 #include "dev.h"
17 #include "debug.h"
18 #include "channel.h"
19
20 static DEFINE_MUTEX(debug_lock);
21
22 unsigned int host1x_debug_trace_cmdbuf;
23
24 static pid_t host1x_debug_force_timeout_pid;
25 static u32 host1x_debug_force_timeout_val;
26 static u32 host1x_debug_force_timeout_channel;
27
host1x_debug_output(struct output * o,const char * fmt,...)28 void host1x_debug_output(struct output *o, const char *fmt, ...)
29 {
30 va_list args;
31 int len;
32
33 va_start(args, fmt);
34 len = vsnprintf(o->buf, sizeof(o->buf), fmt, args);
35 va_end(args);
36
37 o->fn(o->ctx, o->buf, len, false);
38 }
39
host1x_debug_cont(struct output * o,const char * fmt,...)40 void host1x_debug_cont(struct output *o, const char *fmt, ...)
41 {
42 va_list args;
43 int len;
44
45 va_start(args, fmt);
46 len = vsnprintf(o->buf, sizeof(o->buf), fmt, args);
47 va_end(args);
48
49 o->fn(o->ctx, o->buf, len, true);
50 }
51
show_channel(struct host1x_channel * ch,void * data,bool show_fifo)52 static int show_channel(struct host1x_channel *ch, void *data, bool show_fifo)
53 {
54 struct host1x *m = dev_get_drvdata(ch->dev->parent);
55 struct output *o = data;
56 int err;
57
58 err = pm_runtime_resume_and_get(m->dev);
59 if (err < 0)
60 return err;
61
62 mutex_lock(&ch->cdma.lock);
63 mutex_lock(&debug_lock);
64
65 if (show_fifo)
66 host1x_hw_show_channel_fifo(m, ch, o);
67
68 host1x_hw_show_channel_cdma(m, ch, o);
69
70 mutex_unlock(&debug_lock);
71 mutex_unlock(&ch->cdma.lock);
72
73 pm_runtime_put(m->dev);
74
75 return 0;
76 }
77
show_syncpts(struct host1x * m,struct output * o,bool show_all)78 static void show_syncpts(struct host1x *m, struct output *o, bool show_all)
79 {
80 unsigned long irqflags;
81 struct list_head *pos;
82 unsigned int i;
83 int err;
84
85 host1x_debug_output(o, "---- syncpts ----\n");
86
87 err = pm_runtime_resume_and_get(m->dev);
88 if (err < 0)
89 return;
90
91 for (i = 0; i < host1x_syncpt_nb_pts(m); i++) {
92 u32 max = host1x_syncpt_read_max(m->syncpt + i);
93 u32 min = host1x_syncpt_load(m->syncpt + i);
94 unsigned int waiters = 0;
95
96 spin_lock_irqsave(&m->syncpt[i].fences.lock, irqflags);
97 list_for_each(pos, &m->syncpt[i].fences.list)
98 waiters++;
99 spin_unlock_irqrestore(&m->syncpt[i].fences.lock, irqflags);
100
101 if (!kref_read(&m->syncpt[i].ref))
102 continue;
103
104 if (!show_all && !min && !max && !waiters)
105 continue;
106
107 host1x_debug_output(o,
108 "id %u (%s) min %d max %d (%d waiters)\n",
109 i, m->syncpt[i].name, min, max, waiters);
110 }
111
112 for (i = 0; i < host1x_syncpt_nb_bases(m); i++) {
113 u32 base_val;
114
115 base_val = host1x_syncpt_load_wait_base(m->syncpt + i);
116 if (base_val)
117 host1x_debug_output(o, "waitbase id %u val %d\n", i,
118 base_val);
119 }
120
121 pm_runtime_put(m->dev);
122
123 host1x_debug_output(o, "\n");
124 }
125
show_all(struct host1x * m,struct output * o,bool show_fifo)126 static void show_all(struct host1x *m, struct output *o, bool show_fifo)
127 {
128 unsigned int i;
129
130 host1x_hw_show_mlocks(m, o);
131 show_syncpts(m, o, true);
132 host1x_debug_output(o, "---- channels ----\n");
133
134 for (i = 0; i < m->info->nb_channels; ++i) {
135 struct host1x_channel *ch = host1x_channel_get_index(m, i);
136
137 if (ch) {
138 show_channel(ch, o, show_fifo);
139 host1x_channel_put(ch);
140 }
141 }
142 }
143
host1x_debug_all_show(struct seq_file * s,void * unused)144 static int host1x_debug_all_show(struct seq_file *s, void *unused)
145 {
146 struct output o = {
147 .fn = write_to_seqfile,
148 .ctx = s
149 };
150
151 show_all(s->private, &o, true);
152
153 return 0;
154 }
155 DEFINE_SHOW_ATTRIBUTE(host1x_debug_all);
156
host1x_debug_show(struct seq_file * s,void * unused)157 static int host1x_debug_show(struct seq_file *s, void *unused)
158 {
159 struct output o = {
160 .fn = write_to_seqfile,
161 .ctx = s
162 };
163
164 show_all(s->private, &o, false);
165
166 return 0;
167 }
168 DEFINE_SHOW_ATTRIBUTE(host1x_debug);
169
host1x_debugfs_init(struct host1x * host1x)170 static void host1x_debugfs_init(struct host1x *host1x)
171 {
172 struct dentry *de = debugfs_create_dir("tegra-host1x", NULL);
173
174 /* Store the created entry */
175 host1x->debugfs = de;
176
177 debugfs_create_file("status", S_IRUGO, de, host1x, &host1x_debug_fops);
178 debugfs_create_file("status_all", S_IRUGO, de, host1x,
179 &host1x_debug_all_fops);
180
181 debugfs_create_u32("trace_cmdbuf", S_IRUGO|S_IWUSR, de,
182 &host1x_debug_trace_cmdbuf);
183
184 host1x_hw_debug_init(host1x, de);
185
186 debugfs_create_u32("force_timeout_pid", S_IRUGO|S_IWUSR, de,
187 &host1x_debug_force_timeout_pid);
188 debugfs_create_u32("force_timeout_val", S_IRUGO|S_IWUSR, de,
189 &host1x_debug_force_timeout_val);
190 debugfs_create_u32("force_timeout_channel", S_IRUGO|S_IWUSR, de,
191 &host1x_debug_force_timeout_channel);
192 }
193
host1x_debugfs_exit(struct host1x * host1x)194 static void host1x_debugfs_exit(struct host1x *host1x)
195 {
196 debugfs_remove_recursive(host1x->debugfs);
197 }
198
host1x_debug_init(struct host1x * host1x)199 void host1x_debug_init(struct host1x *host1x)
200 {
201 if (IS_ENABLED(CONFIG_DEBUG_FS))
202 host1x_debugfs_init(host1x);
203 }
204
host1x_debug_deinit(struct host1x * host1x)205 void host1x_debug_deinit(struct host1x *host1x)
206 {
207 if (IS_ENABLED(CONFIG_DEBUG_FS))
208 host1x_debugfs_exit(host1x);
209 }
210
host1x_debug_dump(struct host1x * host1x)211 void host1x_debug_dump(struct host1x *host1x)
212 {
213 struct output o = {
214 .fn = write_to_printk
215 };
216
217 show_all(host1x, &o, true);
218 }
219
host1x_debug_dump_syncpts(struct host1x * host1x)220 void host1x_debug_dump_syncpts(struct host1x *host1x)
221 {
222 struct output o = {
223 .fn = write_to_printk
224 };
225
226 show_syncpts(host1x, &o, false);
227 }
228