drivers/dma-buf/sync_debug.c

   1 /*
   2  * Sync File validation framework and debug information
   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 "error";
  67
  68         if (status > 0)
  69                 return "signaled";
  70
  71         return "active";
  72 }
  73
  74 static void sync_print_fence(struct seq_file *s,
  75                              struct fence *fence, bool show)
  76 {
  77         struct sync_timeline *parent = fence_parent(fence);
  78         int status;
  79
  80         status = fence_get_status_locked(fence);
  81
  82         seq_printf(s, "  %s%sfence %s",
  83                    show ? parent->name : "",
  84                    show ? "_" : "",
  85                    sync_status_str(status));
  86
  87         if (status) {
  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
 120         seq_printf(s, "%s: %d\n", obj->name, obj->value);
 121
 122         spin_lock_irq(&obj->lock);
 123         list_for_each(pos, &obj->pt_list) {
 124                 struct sync_pt *pt = container_of(pos, struct sync_pt, link);
 125                 sync_print_fence(s, &pt->base, false);
 126         }
 127         spin_unlock_irq(&obj->lock);
 128 }
 129
 130 static void sync_print_sync_file(struct seq_file *s,
 131                                   struct sync_file *sync_file)
 132 {
 133         int i;
 134
 135         seq_printf(s, "[%p] %s: %s\n", sync_file, sync_file->name,
 136                    sync_status_str(fence_get_status(sync_file->fence)));
 137
 138         if (fence_is_array(sync_file->fence)) {
 139                 struct fence_array *array = to_fence_array(sync_file->fence);
 140
 141                 for (i = 0; i < array->num_fences; ++i)
 142                         sync_print_fence(s, array->fences[i], true);
 143         } else {
 144                 sync_print_fence(s, sync_file->fence, true);
 145         }
 146 }
 147
 148 static int sync_debugfs_show(struct seq_file *s, void *unused)
 149 {
 150         struct list_head *pos;
 151
 152         seq_puts(s, "objs:\n--------------\n");
 153
 154         spin_lock_irq(&sync_timeline_list_lock);
 155         list_for_each(pos, &sync_timeline_list_head) {
 156                 struct sync_timeline *obj =
 157                         container_of(pos, struct sync_timeline,
 158                                      sync_timeline_list);
 159
 160                 sync_print_obj(s, obj);
 161                 seq_puts(s, "\n");
 162         }
 163         spin_unlock_irq(&sync_timeline_list_lock);
 164
 165         seq_puts(s, "fences:\n--------------\n");
 166
 167         spin_lock_irq(&sync_file_list_lock);
 168         list_for_each(pos, &sync_file_list_head) {
 169                 struct sync_file *sync_file =
 170                         container_of(pos, struct sync_file, sync_file_list);
 171
 172                 sync_print_sync_file(s, sync_file);
 173                 seq_puts(s, "\n");
 174         }
 175         spin_unlock_irq(&sync_file_list_lock);
 176         return 0;
 177 }
 178
 179 static int sync_info_debugfs_open(struct inode *inode, struct file *file)
 180 {
 181         return single_open(file, sync_debugfs_show, inode->i_private);
 182 }
 183
 184 static const struct file_operations sync_info_debugfs_fops = {
 185         .open           = sync_info_debugfs_open,
 186         .read           = seq_read,
 187         .llseek         = seq_lseek,
 188         .release        = single_release,
 189 };
 190
 191 static __init int sync_debugfs_init(void)
 192 {
 193         dbgfs = debugfs_create_dir("sync", NULL);
 194
 195         /*
 196          * The debugfs files won't ever get removed and thus, there is
 197          * no need to protect it against removal races. The use of
 198          * debugfs_create_file_unsafe() is actually safe here.
 199          */
 200         debugfs_create_file_unsafe("info", 0444, dbgfs, NULL,
 201                                    &sync_info_debugfs_fops);
 202         debugfs_create_file_unsafe("sw_sync", 0644, dbgfs, NULL,
 203                                    &sw_sync_debugfs_fops);
 204
 205         return 0;
 206 }
 207 late_initcall(sync_debugfs_init);
 208
 209 #define DUMP_CHUNK 256
 210 static char sync_dump_buf[64 * 1024];
 211 void sync_dump(void)
 212 {
 213         struct seq_file s = {
 214                 .buf = sync_dump_buf,
 215                 .size = sizeof(sync_dump_buf) - 1,
 216         };
 217         int i;
 218
 219         sync_debugfs_show(&s, NULL);
 220
 221         for (i = 0; i < s.count; i += DUMP_CHUNK) {
 222                 if ((s.count - i) > DUMP_CHUNK) {
 223                         char c = s.buf[i + DUMP_CHUNK];
 224
 225                         s.buf[i + DUMP_CHUNK] = 0;
 226                         pr_cont("%s", s.buf + i);
 227                         s.buf[i + DUMP_CHUNK] = c;
 228                 } else {
 229                         s.buf[s.count] = 0;
 230                         pr_cont("%s", s.buf + i);
 231                 }
 232         }
 233 }