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 	struct list_head *pos;
81 	unsigned int i;
82 	int err;
83 
84 	host1x_debug_output(o, "---- syncpts ----\n");
85 
86 	err = pm_runtime_resume_and_get(m->dev);
87 	if (err < 0)
88 		return;
89 
90 	for (i = 0; i < host1x_syncpt_nb_pts(m); i++) {
91 		u32 max = host1x_syncpt_read_max(m->syncpt + i);
92 		u32 min = host1x_syncpt_load(m->syncpt + i);
93 		unsigned int waiters = 0;
94 
95 		spin_lock(&m->syncpt[i].intr.lock);
96 		list_for_each(pos, &m->syncpt[i].intr.wait_head)
97 			waiters++;
98 		spin_unlock(&m->syncpt[i].intr.lock);
99 
100 		if (!kref_read(&m->syncpt[i].ref))
101 			continue;
102 
103 		if (!show_all && !min && !max && !waiters)
104 			continue;
105 
106 		host1x_debug_output(o,
107 				    "id %u (%s) min %d max %d (%d waiters)\n",
108 				    i, m->syncpt[i].name, min, max, waiters);
109 	}
110 
111 	for (i = 0; i < host1x_syncpt_nb_bases(m); i++) {
112 		u32 base_val;
113 
114 		base_val = host1x_syncpt_load_wait_base(m->syncpt + i);
115 		if (base_val)
116 			host1x_debug_output(o, "waitbase id %u val %d\n", i,
117 					    base_val);
118 	}
119 
120 	pm_runtime_put(m->dev);
121 
122 	host1x_debug_output(o, "\n");
123 }
124 
show_all(struct host1x * m,struct output * o,bool show_fifo)125 static void show_all(struct host1x *m, struct output *o, bool show_fifo)
126 {
127 	unsigned int i;
128 
129 	host1x_hw_show_mlocks(m, o);
130 	show_syncpts(m, o, true);
131 	host1x_debug_output(o, "---- channels ----\n");
132 
133 	for (i = 0; i < m->info->nb_channels; ++i) {
134 		struct host1x_channel *ch = host1x_channel_get_index(m, i);
135 
136 		if (ch) {
137 			show_channel(ch, o, show_fifo);
138 			host1x_channel_put(ch);
139 		}
140 	}
141 }
142 
host1x_debug_show_all(struct seq_file * s,void * unused)143 static int host1x_debug_show_all(struct seq_file *s, void *unused)
144 {
145 	struct output o = {
146 		.fn = write_to_seqfile,
147 		.ctx = s
148 	};
149 
150 	show_all(s->private, &o, true);
151 
152 	return 0;
153 }
154 
host1x_debug_show(struct seq_file * s,void * unused)155 static int host1x_debug_show(struct seq_file *s, void *unused)
156 {
157 	struct output o = {
158 		.fn = write_to_seqfile,
159 		.ctx = s
160 	};
161 
162 	show_all(s->private, &o, false);
163 
164 	return 0;
165 }
166 
host1x_debug_open_all(struct inode * inode,struct file * file)167 static int host1x_debug_open_all(struct inode *inode, struct file *file)
168 {
169 	return single_open(file, host1x_debug_show_all, inode->i_private);
170 }
171 
172 static const struct file_operations host1x_debug_all_fops = {
173 	.open = host1x_debug_open_all,
174 	.read = seq_read,
175 	.llseek = seq_lseek,
176 	.release = single_release,
177 };
178 
host1x_debug_open(struct inode * inode,struct file * file)179 static int host1x_debug_open(struct inode *inode, struct file *file)
180 {
181 	return single_open(file, host1x_debug_show, inode->i_private);
182 }
183 
184 static const struct file_operations host1x_debug_fops = {
185 	.open = host1x_debug_open,
186 	.read = seq_read,
187 	.llseek = seq_lseek,
188 	.release = single_release,
189 };
190 
host1x_debugfs_init(struct host1x * host1x)191 static void host1x_debugfs_init(struct host1x *host1x)
192 {
193 	struct dentry *de = debugfs_create_dir("tegra-host1x", NULL);
194 
195 	/* Store the created entry */
196 	host1x->debugfs = de;
197 
198 	debugfs_create_file("status", S_IRUGO, de, host1x, &host1x_debug_fops);
199 	debugfs_create_file("status_all", S_IRUGO, de, host1x,
200 			    &host1x_debug_all_fops);
201 
202 	debugfs_create_u32("trace_cmdbuf", S_IRUGO|S_IWUSR, de,
203 			   &host1x_debug_trace_cmdbuf);
204 
205 	host1x_hw_debug_init(host1x, de);
206 
207 	debugfs_create_u32("force_timeout_pid", S_IRUGO|S_IWUSR, de,
208 			   &host1x_debug_force_timeout_pid);
209 	debugfs_create_u32("force_timeout_val", S_IRUGO|S_IWUSR, de,
210 			   &host1x_debug_force_timeout_val);
211 	debugfs_create_u32("force_timeout_channel", S_IRUGO|S_IWUSR, de,
212 			   &host1x_debug_force_timeout_channel);
213 }
214 
host1x_debugfs_exit(struct host1x * host1x)215 static void host1x_debugfs_exit(struct host1x *host1x)
216 {
217 	debugfs_remove_recursive(host1x->debugfs);
218 }
219 
host1x_debug_init(struct host1x * host1x)220 void host1x_debug_init(struct host1x *host1x)
221 {
222 	if (IS_ENABLED(CONFIG_DEBUG_FS))
223 		host1x_debugfs_init(host1x);
224 }
225 
host1x_debug_deinit(struct host1x * host1x)226 void host1x_debug_deinit(struct host1x *host1x)
227 {
228 	if (IS_ENABLED(CONFIG_DEBUG_FS))
229 		host1x_debugfs_exit(host1x);
230 }
231 
host1x_debug_dump(struct host1x * host1x)232 void host1x_debug_dump(struct host1x *host1x)
233 {
234 	struct output o = {
235 		.fn = write_to_printk
236 	};
237 
238 	show_all(host1x, &o, true);
239 }
240 
host1x_debug_dump_syncpts(struct host1x * host1x)241 void host1x_debug_dump_syncpts(struct host1x *host1x)
242 {
243 	struct output o = {
244 		.fn = write_to_printk
245 	};
246 
247 	show_syncpts(host1x, &o, false);
248 }
249