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