Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux...
[firefly-linux-kernel-4.4.55.git] / drivers / staging / android / sync_debug.c
1 /*
2  * drivers/base/sync.c
3  *
4  * Copyright (C) 2012 Google, Inc.
5  *
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.
9  *
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.
14  *
15  */
16
17 #include <linux/debugfs.h>
18 #include <linux/export.h>
19 #include <linux/file.h>
20 #include <linux/fs.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>
29 #include "sync.h"
30
31 #ifdef CONFIG_DEBUG_FS
32
33 static LIST_HEAD(sync_timeline_list_head);
34 static DEFINE_SPINLOCK(sync_timeline_list_lock);
35 static LIST_HEAD(sync_fence_list_head);
36 static DEFINE_SPINLOCK(sync_fence_list_lock);
37
38 void sync_timeline_debug_add(struct sync_timeline *obj)
39 {
40         unsigned long flags;
41
42         spin_lock_irqsave(&sync_timeline_list_lock, flags);
43         list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head);
44         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
45 }
46
47 void sync_timeline_debug_remove(struct sync_timeline *obj)
48 {
49         unsigned long flags;
50
51         spin_lock_irqsave(&sync_timeline_list_lock, flags);
52         list_del(&obj->sync_timeline_list);
53         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
54 }
55
56 void sync_fence_debug_add(struct sync_fence *fence)
57 {
58         unsigned long flags;
59
60         spin_lock_irqsave(&sync_fence_list_lock, flags);
61         list_add_tail(&fence->sync_fence_list, &sync_fence_list_head);
62         spin_unlock_irqrestore(&sync_fence_list_lock, flags);
63 }
64
65 void sync_fence_debug_remove(struct sync_fence *fence)
66 {
67         unsigned long flags;
68
69         spin_lock_irqsave(&sync_fence_list_lock, flags);
70         list_del(&fence->sync_fence_list);
71         spin_unlock_irqrestore(&sync_fence_list_lock, flags);
72 }
73
74 static const char *sync_status_str(int status)
75 {
76         if (status == 0)
77                 return "signaled";
78
79         if (status > 0)
80                 return "active";
81
82         return "error";
83 }
84
85 static void sync_print_pt(struct seq_file *s, struct sync_pt *pt, bool fence)
86 {
87         int status = 1;
88         struct sync_timeline *parent = sync_pt_parent(pt);
89
90         if (fence_is_signaled_locked(&pt->base))
91                 status = pt->base.status;
92
93         seq_printf(s, "  %s%spt %s",
94                    fence ? parent->name : "",
95                    fence ? "_" : "",
96                    sync_status_str(status));
97
98         if (status <= 0) {
99                 struct timespec64 ts64 = ktime_to_timespec64(pt->base.timestamp);
100
101                 seq_printf(s, "@%lld.%09ld", (s64)ts64.tv_sec, ts64.tv_nsec);
102         }
103
104         if (parent->ops->timeline_value_str &&
105             parent->ops->pt_value_str) {
106                 char value[64];
107
108                 parent->ops->pt_value_str(pt, value, sizeof(value));
109                 seq_printf(s, ": %s", value);
110                 if (fence) {
111                         parent->ops->timeline_value_str(parent, value,
112                                                     sizeof(value));
113                         seq_printf(s, " / %s", value);
114                 }
115         }
116
117         seq_puts(s, "\n");
118 }
119
120 static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
121 {
122         struct list_head *pos;
123         unsigned long flags;
124
125         seq_printf(s, "%s %s", obj->name, obj->ops->driver_name);
126
127         if (obj->ops->timeline_value_str) {
128                 char value[64];
129
130                 obj->ops->timeline_value_str(obj, value, sizeof(value));
131                 seq_printf(s, ": %s", value);
132         }
133
134         seq_puts(s, "\n");
135
136         spin_lock_irqsave(&obj->child_list_lock, flags);
137         list_for_each(pos, &obj->child_list_head) {
138                 struct sync_pt *pt =
139                         container_of(pos, struct sync_pt, child_list);
140                 sync_print_pt(s, pt, false);
141         }
142         spin_unlock_irqrestore(&obj->child_list_lock, flags);
143 }
144
145 static void sync_print_fence(struct seq_file *s, struct sync_fence *fence)
146 {
147         wait_queue_t *pos;
148         unsigned long flags;
149         int i;
150
151         seq_printf(s, "[%p] %s: %s\n", fence, fence->name,
152                    sync_status_str(atomic_read(&fence->status)));
153
154         for (i = 0; i < fence->num_fences; ++i) {
155                 struct sync_pt *pt =
156                         container_of(fence->cbs[i].sync_pt,
157                                      struct sync_pt, base);
158
159                 sync_print_pt(s, pt, true);
160         }
161
162         spin_lock_irqsave(&fence->wq.lock, flags);
163         list_for_each_entry(pos, &fence->wq.task_list, task_list) {
164                 struct sync_fence_waiter *waiter;
165
166                 if (pos->func != &sync_fence_wake_up_wq)
167                         continue;
168
169                 waiter = container_of(pos, struct sync_fence_waiter, work);
170
171                 seq_printf(s, "waiter %pF\n", waiter->callback);
172         }
173         spin_unlock_irqrestore(&fence->wq.lock, flags);
174 }
175
176 static int sync_debugfs_show(struct seq_file *s, void *unused)
177 {
178         unsigned long flags;
179         struct list_head *pos;
180
181         seq_puts(s, "objs:\n--------------\n");
182
183         spin_lock_irqsave(&sync_timeline_list_lock, flags);
184         list_for_each(pos, &sync_timeline_list_head) {
185                 struct sync_timeline *obj =
186                         container_of(pos, struct sync_timeline,
187                                      sync_timeline_list);
188
189                 sync_print_obj(s, obj);
190                 seq_puts(s, "\n");
191         }
192         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
193
194         seq_puts(s, "fences:\n--------------\n");
195
196         spin_lock_irqsave(&sync_fence_list_lock, flags);
197         list_for_each(pos, &sync_fence_list_head) {
198                 struct sync_fence *fence =
199                         container_of(pos, struct sync_fence, sync_fence_list);
200
201                 sync_print_fence(s, fence);
202                 seq_puts(s, "\n");
203         }
204         spin_unlock_irqrestore(&sync_fence_list_lock, flags);
205         return 0;
206 }
207
208 static int sync_debugfs_open(struct inode *inode, struct file *file)
209 {
210         return single_open(file, sync_debugfs_show, inode->i_private);
211 }
212
213 static const struct file_operations sync_debugfs_fops = {
214         .open           = sync_debugfs_open,
215         .read           = seq_read,
216         .llseek         = seq_lseek,
217         .release        = single_release,
218 };
219
220 static __init int sync_debugfs_init(void)
221 {
222         debugfs_create_file("sync", S_IRUGO, NULL, NULL, &sync_debugfs_fops);
223         return 0;
224 }
225 late_initcall(sync_debugfs_init);
226
227 #define DUMP_CHUNK 256
228 static char sync_dump_buf[64 * 1024];
229 void sync_dump(void)
230 {
231         struct seq_file s = {
232                 .buf = sync_dump_buf,
233                 .size = sizeof(sync_dump_buf) - 1,
234         };
235         int i;
236
237         sync_debugfs_show(&s, NULL);
238
239         for (i = 0; i < s.count; i += DUMP_CHUNK) {
240                 if ((s.count - i) > DUMP_CHUNK) {
241                         char c = s.buf[i + DUMP_CHUNK];
242
243                         s.buf[i + DUMP_CHUNK] = 0;
244                         pr_cont("%s", s.buf + i);
245                         s.buf[i + DUMP_CHUNK] = c;
246                 } else {
247                         s.buf[s.count] = 0;
248                         pr_cont("%s", s.buf + i);
249                 }
250         }
251 }
252
253 #endif