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 "sync_debug.h"
  19
  20 static struct dentry *dbgfs;
  21
  22 static LIST_HEAD(sync_timeline_list_head);
  23 static DEFINE_SPINLOCK(sync_timeline_list_lock);
  24 static LIST_HEAD(sync_file_list_head);
  25 static DEFINE_SPINLOCK(sync_file_list_lock);
  26
  27 void sync_timeline_debug_add(struct sync_timeline *obj)
  28 {
  29         unsigned long flags;
  30
  31         spin_lock_irqsave(&sync_timeline_list_lock, flags);
  32         list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head);
  33         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
  34 }
  35
  36 void sync_timeline_debug_remove(struct sync_timeline *obj)
  37 {
  38         unsigned long flags;
  39
  40         spin_lock_irqsave(&sync_timeline_list_lock, flags);
  41         list_del(&obj->sync_timeline_list);
  42         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
  43 }
  44
  45 void sync_file_debug_add(struct sync_file *sync_file)
  46 {
  47         unsigned long flags;
  48
  49         spin_lock_irqsave(&sync_file_list_lock, flags);
  50         list_add_tail(&sync_file->sync_file_list, &sync_file_list_head);
  51         spin_unlock_irqrestore(&sync_file_list_lock, flags);
  52 }
  53
  54 void sync_file_debug_remove(struct sync_file *sync_file)
  55 {
  56         unsigned long flags;
  57
  58         spin_lock_irqsave(&sync_file_list_lock, flags);
  59         list_del(&sync_file->sync_file_list);
  60         spin_unlock_irqrestore(&sync_file_list_lock, flags);
  61 }
  62
  63 static const char *sync_status_str(int status)
  64 {
  65         if (status == 0)
  66                 return "signaled";
  67
  68         if (status > 0)
  69                 return "active";
  70
  71         return "error";
  72 }
  73
  74 static void sync_print_fence(struct seq_file *s, struct fence *fence, bool show)
  75 {
  76         int status = 1;
  77         struct sync_timeline *parent = fence_parent(fence);
  78
  79         if (fence_is_signaled_locked(fence))
  80                 status = fence->status;
  81
  82         seq_printf(s, "  %s%sfence %s",
  83                    show ? parent->name : "",
  84                    show ? "_" : "",
  85                    sync_status_str(status));
  86
  87         if (status <= 0) {
  88                 struct timespec64 ts64 =
  89                         ktime_to_timespec64(fence->timestamp);
  90
  91                 seq_printf(s, "@%lld.%09ld", (s64)ts64.tv_sec, ts64.tv_nsec);
  92         }
  93
  94         if (fence->ops->timeline_value_str &&
  95                 fence->ops->fence_value_str) {
  96                 char value[64];
  97                 bool success;
  98
  99                 fence->ops->fence_value_str(fence, value, sizeof(value));
 100                 success = strlen(value);
 101
 102                 if (success) {
 103                         seq_printf(s, ": %s", value);
 104
 105                         fence->ops->timeline_value_str(fence, value,
 106                                                        sizeof(value));
 107
 108                         if (strlen(value))
 109                                 seq_printf(s, " / %s", value);
 110                 }
 111         }
 112
 113         seq_puts(s, "\n");
 114 }
 115
 116 static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
 117 {
 118         struct list_head *pos;
 119         unsigned long flags;
 120
 121         seq_printf(s, "%s: %d\n", obj->name, obj->value);
 122
 123         spin_lock_irqsave(&obj->child_list_lock, flags);
 124         list_for_each(pos, &obj->child_list_head) {
 125                 struct sync_pt *pt =
 126                         container_of(pos, struct sync_pt, child_list);
 127                 sync_print_fence(s, &pt->base, false);
 128         }
 129         spin_unlock_irqrestore(&obj->child_list_lock, flags);
 130 }
 131
 132 static void sync_print_sync_file(struct seq_file *s,
 133                                   struct sync_file *sync_file)
 134 {
 135         int i;
 136
 137         seq_printf(s, "[%p] %s: %s\n", sync_file, sync_file->name,
 138                    sync_status_str(atomic_read(&sync_file->status)));
 139
 140         for (i = 0; i < sync_file->num_fences; ++i)
 141                 sync_print_fence(s, sync_file->cbs[i].fence, true);
 142 }
 143
 144 static int sync_debugfs_show(struct seq_file *s, void *unused)
 145 {
 146         unsigned long flags;
 147         struct list_head *pos;
 148
 149         seq_puts(s, "objs:\n--------------\n");
 150
 151         spin_lock_irqsave(&sync_timeline_list_lock, flags);
 152         list_for_each(pos, &sync_timeline_list_head) {
 153                 struct sync_timeline *obj =
 154                         container_of(pos, struct sync_timeline,
 155                                      sync_timeline_list);
 156
 157                 sync_print_obj(s, obj);
 158                 seq_puts(s, "\n");
 159         }
 160         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
 161
 162         seq_puts(s, "fences:\n--------------\n");
 163
 164         spin_lock_irqsave(&sync_file_list_lock, flags);
 165         list_for_each(pos, &sync_file_list_head) {
 166                 struct sync_file *sync_file =
 167                         container_of(pos, struct sync_file, sync_file_list);
 168
 169                 sync_print_sync_file(s, sync_file);
 170                 seq_puts(s, "\n");
 171         }
 172         spin_unlock_irqrestore(&sync_file_list_lock, flags);
 173         return 0;
 174 }
 175
 176 static int sync_info_debugfs_open(struct inode *inode, struct file *file)
 177 {
 178         return single_open(file, sync_debugfs_show, inode->i_private);
 179 }
 180
 181 static const struct file_operations sync_info_debugfs_fops = {
 182         .open           = sync_info_debugfs_open,
 183         .read           = seq_read,
 184         .llseek         = seq_lseek,
 185         .release        = single_release,
 186 };
 187
 188 static __init int sync_debugfs_init(void)
 189 {
 190         dbgfs = debugfs_create_dir("sync", NULL);
 191
 192         /*
 193          * The debugfs files won't ever get removed and thus, there is
 194          * no need to protect it against removal races. The use of
 195          * debugfs_create_file_unsafe() is actually safe here.
 196          */
 197         debugfs_create_file_unsafe("info", 0444, dbgfs, NULL,
 198                                    &sync_info_debugfs_fops);
 199         debugfs_create_file_unsafe("sw_sync", 0644, dbgfs, NULL,
 200                                    &sw_sync_debugfs_fops);
 201
 202         return 0;
 203 }
 204 late_initcall(sync_debugfs_init);
 205
 206 #define DUMP_CHUNK 256
 207 static char sync_dump_buf[64 * 1024];
 208 void sync_dump(void)
 209 {
 210         struct seq_file s = {
 211                 .buf = sync_dump_buf,
 212                 .size = sizeof(sync_dump_buf) - 1,
 213         };
 214         int i;
 215
 216         sync_debugfs_show(&s, NULL);
 217
 218         for (i = 0; i < s.count; i += DUMP_CHUNK) {
 219                 if ((s.count - i) > DUMP_CHUNK) {
 220                         char c = s.buf[i + DUMP_CHUNK];
 221
 222                         s.buf[i + DUMP_CHUNK] = 0;
 223                         pr_cont("%s", s.buf + i);
 224                         s.buf[i + DUMP_CHUNK] = c;
 225                 } else {
 226                         s.buf[s.count] = 0;
 227                         pr_cont("%s", s.buf + i);
 228                 }
 229         }
 230 }