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 "sync.h"
  29
  30 #ifdef CONFIG_DEBUG_FS
  31
  32 static LIST_HEAD(sync_timeline_list_head);
  33 static DEFINE_SPINLOCK(sync_timeline_list_lock);
  34 static LIST_HEAD(sync_fence_list_head);
  35 static DEFINE_SPINLOCK(sync_fence_list_lock);
  36
  37 void sync_timeline_debug_add(struct sync_timeline *obj)
  38 {
  39         unsigned long flags;
  40
  41         spin_lock_irqsave(&sync_timeline_list_lock, flags);
  42         list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head);
  43         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
  44 }
  45
  46 void sync_timeline_debug_remove(struct sync_timeline *obj)
  47 {
  48         unsigned long flags;
  49
  50         spin_lock_irqsave(&sync_timeline_list_lock, flags);
  51         list_del(&obj->sync_timeline_list);
  52         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
  53 }
  54
  55 void sync_fence_debug_add(struct sync_fence *fence)
  56 {
  57         unsigned long flags;
  58
  59         spin_lock_irqsave(&sync_fence_list_lock, flags);
  60         list_add_tail(&fence->sync_fence_list, &sync_fence_list_head);
  61         spin_unlock_irqrestore(&sync_fence_list_lock, flags);
  62 }
  63
  64 void sync_fence_debug_remove(struct sync_fence *fence)
  65 {
  66         unsigned long flags;
  67
  68         spin_lock_irqsave(&sync_fence_list_lock, flags);
  69         list_del(&fence->sync_fence_list);
  70         spin_unlock_irqrestore(&sync_fence_list_lock, flags);
  71 }
  72
  73 static const char *sync_status_str(int status)
  74 {
  75         if (status == 0)
  76                 return "signaled";
  77
  78         if (status > 0)
  79                 return "active";
  80
  81         return "error";
  82 }
  83
  84 static void sync_print_pt(struct seq_file *s, struct sync_pt *pt, bool fence)
  85 {
  86         int status = 1;
  87         struct sync_timeline *parent = sync_pt_parent(pt);
  88
  89         if (fence_is_signaled_locked(&pt->base))
  90                 status = pt->base.status;
  91
  92         seq_printf(s, "  %s%spt %s",
  93                    fence ? parent->name : "",
  94                    fence ? "_" : "",
  95                    sync_status_str(status));
  96
  97         if (status <= 0) {
  98                 struct timeval tv = ktime_to_timeval(pt->base.timestamp);
  99
 100                 seq_printf(s, "@%ld.%06ld", tv.tv_sec, tv.tv_usec);
 101         }
 102
 103         if (parent->ops->timeline_value_str &&
 104             parent->ops->pt_value_str) {
 105                 char value[64];
 106
 107                 parent->ops->pt_value_str(pt, value, sizeof(value));
 108                 seq_printf(s, ": %s", value);
 109                 if (fence) {
 110                         parent->ops->timeline_value_str(parent, value,
 111                                                     sizeof(value));
 112                         seq_printf(s, " / %s", value);
 113                 }
 114         }
 115
 116         seq_puts(s, "\n");
 117 }
 118
 119 static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
 120 {
 121         struct list_head *pos;
 122         unsigned long flags;
 123
 124         seq_printf(s, "%s %s", obj->name, obj->ops->driver_name);
 125
 126         if (obj->ops->timeline_value_str) {
 127                 char value[64];
 128
 129                 obj->ops->timeline_value_str(obj, value, sizeof(value));
 130                 seq_printf(s, ": %s", value);
 131         }
 132
 133         seq_puts(s, "\n");
 134
 135         spin_lock_irqsave(&obj->child_list_lock, flags);
 136         list_for_each(pos, &obj->child_list_head) {
 137                 struct sync_pt *pt =
 138                         container_of(pos, struct sync_pt, child_list);
 139                 sync_print_pt(s, pt, false);
 140         }
 141         spin_unlock_irqrestore(&obj->child_list_lock, flags);
 142 }
 143
 144 static void sync_print_fence(struct seq_file *s, struct sync_fence *fence)
 145 {
 146         wait_queue_t *pos;
 147         unsigned long flags;
 148         int i;
 149
 150         seq_printf(s, "[%p] %s: %s\n", fence, fence->name,
 151                    sync_status_str(atomic_read(&fence->status)));
 152
 153         for (i = 0; i < fence->num_fences; ++i) {
 154                 struct sync_pt *pt =
 155                         container_of(fence->cbs[i].sync_pt,
 156                                      struct sync_pt, base);
 157
 158                 sync_print_pt(s, pt, true);
 159         }
 160
 161         spin_lock_irqsave(&fence->wq.lock, flags);
 162         list_for_each_entry(pos, &fence->wq.task_list, task_list) {
 163                 struct sync_fence_waiter *waiter;
 164
 165                 if (pos->func != &sync_fence_wake_up_wq)
 166                         continue;
 167
 168                 waiter = container_of(pos, struct sync_fence_waiter, work);
 169
 170                 seq_printf(s, "waiter %pF\n", waiter->callback);
 171         }
 172         spin_unlock_irqrestore(&fence->wq.lock, flags);
 173 }
 174
 175 static int sync_debugfs_show(struct seq_file *s, void *unused)
 176 {
 177         unsigned long flags;
 178         struct list_head *pos;
 179
 180         seq_puts(s, "objs:\n--------------\n");
 181
 182         spin_lock_irqsave(&sync_timeline_list_lock, flags);
 183         list_for_each(pos, &sync_timeline_list_head) {
 184                 struct sync_timeline *obj =
 185                         container_of(pos, struct sync_timeline,
 186                                      sync_timeline_list);
 187
 188                 sync_print_obj(s, obj);
 189                 seq_puts(s, "\n");
 190         }
 191         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
 192
 193         seq_puts(s, "fences:\n--------------\n");
 194
 195         spin_lock_irqsave(&sync_fence_list_lock, flags);
 196         list_for_each(pos, &sync_fence_list_head) {
 197                 struct sync_fence *fence =
 198                         container_of(pos, struct sync_fence, sync_fence_list);
 199
 200                 sync_print_fence(s, fence);
 201                 seq_puts(s, "\n");
 202         }
 203         spin_unlock_irqrestore(&sync_fence_list_lock, flags);
 204         return 0;
 205 }
 206
 207 static int sync_debugfs_open(struct inode *inode, struct file *file)
 208 {
 209         return single_open(file, sync_debugfs_show, inode->i_private);
 210 }
 211
 212 static const struct file_operations sync_debugfs_fops = {
 213         .open           = sync_debugfs_open,
 214         .read           = seq_read,
 215         .llseek         = seq_lseek,
 216         .release        = single_release,
 217 };
 218
 219 static __init int sync_debugfs_init(void)
 220 {
 221         debugfs_create_file("sync", S_IRUGO, NULL, NULL, &sync_debugfs_fops);
 222         return 0;
 223 }
 224 late_initcall(sync_debugfs_init);
 225
 226 #define DUMP_CHUNK 256
 227 static char sync_dump_buf[64 * 1024];
 228 void sync_dump(void)
 229 {
 230         struct seq_file s = {
 231                 .buf = sync_dump_buf,
 232                 .size = sizeof(sync_dump_buf) - 1,
 233         };
 234         int i;
 235
 236         sync_debugfs_show(&s, NULL);
 237
 238         for (i = 0; i < s.count; i += DUMP_CHUNK) {
 239                 if ((s.count - i) > DUMP_CHUNK) {
 240                         char c = s.buf[i + DUMP_CHUNK];
 241
 242                         s.buf[i + DUMP_CHUNK] = 0;
 243                         pr_cont("%s", s.buf + i);
 244                         s.buf[i + DUMP_CHUNK] = c;
 245                 } else {
 246                         s.buf[s.count] = 0;
 247                         pr_cont("%s", s.buf + i);
 248                 }
 249         }
 250 }
 251
 252 #endif