4 * Copyright (C) 2012 Google, Inc.
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
17 #include <linux/debugfs.h>
18 #include <linux/export.h>
19 #include <linux/file.h>
21 #include <linux/kernel.h>
22 #include <linux/poll.h>
23 #include <linux/sched.h>
24 #include <linux/seq_file.h>
25 #include <linux/slab.h>
26 #include <linux/uaccess.h>
27 #include <linux/anon_inodes.h>
28 #include <linux/time64.h>
31 #ifdef CONFIG_DEBUG_FS
33 static struct dentry
*dbgfs
;
35 static LIST_HEAD(sync_timeline_list_head
);
36 static DEFINE_SPINLOCK(sync_timeline_list_lock
);
37 static LIST_HEAD(sync_file_list_head
);
38 static DEFINE_SPINLOCK(sync_file_list_lock
);
40 void sync_timeline_debug_add(struct sync_timeline
*obj
)
44 spin_lock_irqsave(&sync_timeline_list_lock
, flags
);
45 list_add_tail(&obj
->sync_timeline_list
, &sync_timeline_list_head
);
46 spin_unlock_irqrestore(&sync_timeline_list_lock
, flags
);
49 void sync_timeline_debug_remove(struct sync_timeline
*obj
)
53 spin_lock_irqsave(&sync_timeline_list_lock
, flags
);
54 list_del(&obj
->sync_timeline_list
);
55 spin_unlock_irqrestore(&sync_timeline_list_lock
, flags
);
58 void sync_file_debug_add(struct sync_file
*sync_file
)
62 spin_lock_irqsave(&sync_file_list_lock
, flags
);
63 list_add_tail(&sync_file
->sync_file_list
, &sync_file_list_head
);
64 spin_unlock_irqrestore(&sync_file_list_lock
, flags
);
67 void sync_file_debug_remove(struct sync_file
*sync_file
)
71 spin_lock_irqsave(&sync_file_list_lock
, flags
);
72 list_del(&sync_file
->sync_file_list
);
73 spin_unlock_irqrestore(&sync_file_list_lock
, flags
);
76 static const char *sync_status_str(int status
)
87 static void sync_print_fence(struct seq_file
*s
, struct fence
*fence
, bool show
)
90 struct sync_timeline
*parent
= fence_parent(fence
);
92 if (fence_is_signaled_locked(fence
))
93 status
= fence
->status
;
95 seq_printf(s
, " %s%sfence %s",
96 show
? parent
->name
: "",
98 sync_status_str(status
));
101 struct timespec64 ts64
=
102 ktime_to_timespec64(fence
->timestamp
);
104 seq_printf(s
, "@%lld.%09ld", (s64
)ts64
.tv_sec
, ts64
.tv_nsec
);
107 if ((!fence
|| fence
->ops
->timeline_value_str
) &&
108 fence
->ops
->fence_value_str
) {
112 fence
->ops
->fence_value_str(fence
, value
, sizeof(value
));
113 success
= strlen(value
);
116 seq_printf(s
, ": %s", value
);
118 if (success
&& fence
) {
119 fence
->ops
->timeline_value_str(fence
, value
,
123 seq_printf(s
, " / %s", value
);
130 static void sync_print_obj(struct seq_file
*s
, struct sync_timeline
*obj
)
132 struct list_head
*pos
;
135 seq_printf(s
, "%s %s", obj
->name
, obj
->ops
->driver_name
);
137 if (obj
->ops
->timeline_value_str
) {
140 obj
->ops
->timeline_value_str(obj
, value
, sizeof(value
));
141 seq_printf(s
, ": %s", value
);
146 spin_lock_irqsave(&obj
->child_list_lock
, flags
);
147 list_for_each(pos
, &obj
->child_list_head
) {
148 struct fence
*fence
=
149 container_of(pos
, struct fence
, child_list
);
150 sync_print_fence(s
, fence
, false);
152 spin_unlock_irqrestore(&obj
->child_list_lock
, flags
);
155 static void sync_print_sync_file(struct seq_file
*s
,
156 struct sync_file
*sync_file
)
160 seq_printf(s
, "[%p] %s: %s\n", sync_file
, sync_file
->name
,
161 sync_status_str(atomic_read(&sync_file
->status
)));
163 for (i
= 0; i
< sync_file
->num_fences
; ++i
)
164 sync_print_fence(s
, sync_file
->cbs
[i
].fence
, true);
167 static int sync_debugfs_show(struct seq_file
*s
, void *unused
)
170 struct list_head
*pos
;
172 seq_puts(s
, "objs:\n--------------\n");
174 spin_lock_irqsave(&sync_timeline_list_lock
, flags
);
175 list_for_each(pos
, &sync_timeline_list_head
) {
176 struct sync_timeline
*obj
=
177 container_of(pos
, struct sync_timeline
,
180 sync_print_obj(s
, obj
);
183 spin_unlock_irqrestore(&sync_timeline_list_lock
, flags
);
185 seq_puts(s
, "fences:\n--------------\n");
187 spin_lock_irqsave(&sync_file_list_lock
, flags
);
188 list_for_each(pos
, &sync_file_list_head
) {
189 struct sync_file
*sync_file
=
190 container_of(pos
, struct sync_file
, sync_file_list
);
192 sync_print_sync_file(s
, sync_file
);
195 spin_unlock_irqrestore(&sync_file_list_lock
, flags
);
199 static int sync_info_debugfs_open(struct inode
*inode
, struct file
*file
)
201 return single_open(file
, sync_debugfs_show
, inode
->i_private
);
204 static const struct file_operations sync_info_debugfs_fops
= {
205 .open
= sync_info_debugfs_open
,
208 .release
= single_release
,
214 * improper use of this can result in deadlocking kernel drivers from userspace.
217 /* opening sw_sync create a new sync obj */
218 static int sw_sync_debugfs_open(struct inode
*inode
, struct file
*file
)
220 struct sw_sync_timeline
*obj
;
221 char task_comm
[TASK_COMM_LEN
];
223 get_task_comm(task_comm
, current
);
225 obj
= sw_sync_timeline_create(task_comm
);
229 file
->private_data
= obj
;
234 static int sw_sync_debugfs_release(struct inode
*inode
, struct file
*file
)
236 struct sw_sync_timeline
*obj
= file
->private_data
;
238 sync_timeline_destroy(&obj
->obj
);
242 static long sw_sync_ioctl_create_fence(struct sw_sync_timeline
*obj
,
245 int fd
= get_unused_fd_flags(O_CLOEXEC
);
248 struct sync_file
*sync_file
;
249 struct sw_sync_create_fence_data data
;
254 if (copy_from_user(&data
, (void __user
*)arg
, sizeof(data
))) {
259 fence
= sw_sync_pt_create(obj
, data
.value
);
265 data
.name
[sizeof(data
.name
) - 1] = '\0';
266 sync_file
= sync_file_create(data
.name
, fence
);
274 if (copy_to_user((void __user
*)arg
, &data
, sizeof(data
))) {
275 sync_file_put(sync_file
);
280 sync_file_install(sync_file
, fd
);
289 static long sw_sync_ioctl_inc(struct sw_sync_timeline
*obj
, unsigned long arg
)
293 if (copy_from_user(&value
, (void __user
*)arg
, sizeof(value
)))
296 sw_sync_timeline_inc(obj
, value
);
301 static long sw_sync_ioctl(struct file
*file
, unsigned int cmd
,
304 struct sw_sync_timeline
*obj
= file
->private_data
;
307 case SW_SYNC_IOC_CREATE_FENCE
:
308 return sw_sync_ioctl_create_fence(obj
, arg
);
310 case SW_SYNC_IOC_INC
:
311 return sw_sync_ioctl_inc(obj
, arg
);
318 static const struct file_operations sw_sync_debugfs_fops
= {
319 .open
= sw_sync_debugfs_open
,
320 .release
= sw_sync_debugfs_release
,
321 .unlocked_ioctl
= sw_sync_ioctl
,
322 .compat_ioctl
= sw_sync_ioctl
,
325 static __init
int sync_debugfs_init(void)
327 dbgfs
= debugfs_create_dir("sync", NULL
);
329 debugfs_create_file("info", 0444, dbgfs
, NULL
, &sync_info_debugfs_fops
);
330 debugfs_create_file("sw_sync", 0644, dbgfs
, NULL
,
331 &sw_sync_debugfs_fops
);
335 late_initcall(sync_debugfs_init
);
337 #define DUMP_CHUNK 256
338 static char sync_dump_buf
[64 * 1024];
341 struct seq_file s
= {
342 .buf
= sync_dump_buf
,
343 .size
= sizeof(sync_dump_buf
) - 1,
347 sync_debugfs_show(&s
, NULL
);
349 for (i
= 0; i
< s
.count
; i
+= DUMP_CHUNK
) {
350 if ((s
.count
- i
) > DUMP_CHUNK
) {
351 char c
= s
.buf
[i
+ DUMP_CHUNK
];
353 s
.buf
[i
+ DUMP_CHUNK
] = 0;
354 pr_cont("%s", s
.buf
+ i
);
355 s
.buf
[i
+ DUMP_CHUNK
] = c
;
358 pr_cont("%s", s
.buf
+ i
);