]> Git Repo - linux.git/blob - drivers/staging/android/sync_debug.c
mm: rework virtual memory accounting
[linux.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 fence *pt, bool fence)
86 {
87         int status = 1;
88
89         if (fence_is_signaled_locked(pt))
90                 status = pt->status;
91
92         seq_printf(s, "  %s%spt %s",
93                    fence && pt->ops->get_timeline_name ?
94                    pt->ops->get_timeline_name(pt) : "",
95                    fence ? "_" : "",
96                    sync_status_str(status));
97
98         if (status <= 0) {
99                 struct timespec64 ts64 =
100                         ktime_to_timespec64(pt->timestamp);
101
102                 seq_printf(s, "@%lld.%09ld", (s64)ts64.tv_sec, ts64.tv_nsec);
103         }
104
105         if ((!fence || pt->ops->timeline_value_str) &&
106             pt->ops->fence_value_str) {
107                 char value[64];
108                 bool success;
109
110                 pt->ops->fence_value_str(pt, value, sizeof(value));
111                 success = strlen(value);
112
113                 if (success)
114                         seq_printf(s, ": %s", value);
115
116                 if (success && fence) {
117                         pt->ops->timeline_value_str(pt, value, sizeof(value));
118
119                         if (strlen(value))
120                                 seq_printf(s, " / %s", value);
121                 }
122         }
123
124         seq_puts(s, "\n");
125 }
126
127 static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
128 {
129         struct list_head *pos;
130         unsigned long flags;
131
132         seq_printf(s, "%s %s", obj->name, obj->ops->driver_name);
133
134         if (obj->ops->timeline_value_str) {
135                 char value[64];
136
137                 obj->ops->timeline_value_str(obj, value, sizeof(value));
138                 seq_printf(s, ": %s", value);
139         }
140
141         seq_puts(s, "\n");
142
143         spin_lock_irqsave(&obj->child_list_lock, flags);
144         list_for_each(pos, &obj->child_list_head) {
145                 struct sync_pt *pt =
146                         container_of(pos, struct sync_pt, child_list);
147                 sync_print_pt(s, &pt->base, false);
148         }
149         spin_unlock_irqrestore(&obj->child_list_lock, flags);
150 }
151
152 static void sync_print_fence(struct seq_file *s, struct sync_fence *fence)
153 {
154         wait_queue_t *pos;
155         unsigned long flags;
156         int i;
157
158         seq_printf(s, "[%p] %s: %s\n", fence, fence->name,
159                    sync_status_str(atomic_read(&fence->status)));
160
161         for (i = 0; i < fence->num_fences; ++i) {
162                 sync_print_pt(s, fence->cbs[i].sync_pt, true);
163         }
164
165         spin_lock_irqsave(&fence->wq.lock, flags);
166         list_for_each_entry(pos, &fence->wq.task_list, task_list) {
167                 struct sync_fence_waiter *waiter;
168
169                 if (pos->func != &sync_fence_wake_up_wq)
170                         continue;
171
172                 waiter = container_of(pos, struct sync_fence_waiter, work);
173
174                 seq_printf(s, "waiter %pF\n", waiter->callback);
175         }
176         spin_unlock_irqrestore(&fence->wq.lock, flags);
177 }
178
179 static int sync_debugfs_show(struct seq_file *s, void *unused)
180 {
181         unsigned long flags;
182         struct list_head *pos;
183
184         seq_puts(s, "objs:\n--------------\n");
185
186         spin_lock_irqsave(&sync_timeline_list_lock, flags);
187         list_for_each(pos, &sync_timeline_list_head) {
188                 struct sync_timeline *obj =
189                         container_of(pos, struct sync_timeline,
190                                      sync_timeline_list);
191
192                 sync_print_obj(s, obj);
193                 seq_puts(s, "\n");
194         }
195         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
196
197         seq_puts(s, "fences:\n--------------\n");
198
199         spin_lock_irqsave(&sync_fence_list_lock, flags);
200         list_for_each(pos, &sync_fence_list_head) {
201                 struct sync_fence *fence =
202                         container_of(pos, struct sync_fence, sync_fence_list);
203
204                 sync_print_fence(s, fence);
205                 seq_puts(s, "\n");
206         }
207         spin_unlock_irqrestore(&sync_fence_list_lock, flags);
208         return 0;
209 }
210
211 static int sync_debugfs_open(struct inode *inode, struct file *file)
212 {
213         return single_open(file, sync_debugfs_show, inode->i_private);
214 }
215
216 static const struct file_operations sync_debugfs_fops = {
217         .open           = sync_debugfs_open,
218         .read           = seq_read,
219         .llseek         = seq_lseek,
220         .release        = single_release,
221 };
222
223 static __init int sync_debugfs_init(void)
224 {
225         debugfs_create_file("sync", S_IRUGO, NULL, NULL, &sync_debugfs_fops);
226         return 0;
227 }
228 late_initcall(sync_debugfs_init);
229
230 #define DUMP_CHUNK 256
231 static char sync_dump_buf[64 * 1024];
232 void sync_dump(void)
233 {
234         struct seq_file s = {
235                 .buf = sync_dump_buf,
236                 .size = sizeof(sync_dump_buf) - 1,
237         };
238         int i;
239
240         sync_debugfs_show(&s, NULL);
241
242         for (i = 0; i < s.count; i += DUMP_CHUNK) {
243                 if ((s.count - i) > DUMP_CHUNK) {
244                         char c = s.buf[i + DUMP_CHUNK];
245
246                         s.buf[i + DUMP_CHUNK] = 0;
247                         pr_cont("%s", s.buf + i);
248                         s.buf[i + DUMP_CHUNK] = c;
249                 } else {
250                         s.buf[s.count] = 0;
251                         pr_cont("%s", s.buf + i);
252                 }
253         }
254 }
255
256 #endif
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