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 <linux/sync_file.h>
  30 #include "sw_sync.h"
  31
  32 #ifdef CONFIG_DEBUG_FS
  33
  34 static struct dentry *dbgfs;
  35
  36 static LIST_HEAD(sync_timeline_list_head);
  37 static DEFINE_SPINLOCK(sync_timeline_list_lock);
  38 static LIST_HEAD(sync_file_list_head);
  39 static DEFINE_SPINLOCK(sync_file_list_lock);
  40
  41 void sync_timeline_debug_add(struct sync_timeline *obj)
  42 {
  43         unsigned long flags;
  44
  45         spin_lock_irqsave(&sync_timeline_list_lock, flags);
  46         list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head);
  47         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
  48 }
  49
  50 void sync_timeline_debug_remove(struct sync_timeline *obj)
  51 {
  52         unsigned long flags;
  53
  54         spin_lock_irqsave(&sync_timeline_list_lock, flags);
  55         list_del(&obj->sync_timeline_list);
  56         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
  57 }
  58
  59 void sync_file_debug_add(struct sync_file *sync_file)
  60 {
  61         unsigned long flags;
  62
  63         spin_lock_irqsave(&sync_file_list_lock, flags);
  64         list_add_tail(&sync_file->sync_file_list, &sync_file_list_head);
  65         spin_unlock_irqrestore(&sync_file_list_lock, flags);
  66 }
  67
  68 void sync_file_debug_remove(struct sync_file *sync_file)
  69 {
  70         unsigned long flags;
  71
  72         spin_lock_irqsave(&sync_file_list_lock, flags);
  73         list_del(&sync_file->sync_file_list);
  74         spin_unlock_irqrestore(&sync_file_list_lock, flags);
  75 }
  76
  77 static const char *sync_status_str(int status)
  78 {
  79         if (status == 0)
  80                 return "signaled";
  81
  82         if (status > 0)
  83                 return "active";
  84
  85         return "error";
  86 }
  87
  88 static void sync_print_fence(struct seq_file *s, struct fence *fence, bool show)
  89 {
  90         int status = 1;
  91         struct sync_timeline *parent = fence_parent(fence);
  92
  93         if (fence_is_signaled_locked(fence))
  94                 status = fence->status;
  95
  96         seq_printf(s, "  %s%sfence %s",
  97                    show ? parent->name : "",
  98                    show ? "_" : "",
  99                    sync_status_str(status));
 100
 101         if (status <= 0) {
 102                 struct timespec64 ts64 =
 103                         ktime_to_timespec64(fence->timestamp);
 104
 105                 seq_printf(s, "@%lld.%09ld", (s64)ts64.tv_sec, ts64.tv_nsec);
 106         }
 107
 108         if ((!fence || fence->ops->timeline_value_str) &&
 109                 fence->ops->fence_value_str) {
 110                 char value[64];
 111                 bool success;
 112
 113                 fence->ops->fence_value_str(fence, value, sizeof(value));
 114                 success = strlen(value);
 115
 116                 if (success)
 117                         seq_printf(s, ": %s", value);
 118
 119                 if (success && fence) {
 120                         fence->ops->timeline_value_str(fence, value,
 121                                                        sizeof(value));
 122
 123                         if (strlen(value))
 124                                 seq_printf(s, " / %s", value);
 125                 }
 126         }
 127
 128         seq_puts(s, "\n");
 129 }
 130
 131 static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
 132 {
 133         struct list_head *pos;
 134         unsigned long flags;
 135
 136         seq_printf(s, "%s %s", obj->name, obj->ops->driver_name);
 137
 138         if (obj->ops->timeline_value_str) {
 139                 char value[64];
 140
 141                 obj->ops->timeline_value_str(obj, value, sizeof(value));
 142                 seq_printf(s, ": %s", value);
 143         }
 144
 145         seq_puts(s, "\n");
 146
 147         spin_lock_irqsave(&obj->child_list_lock, flags);
 148         list_for_each(pos, &obj->child_list_head) {
 149                 struct fence *fence =
 150                         container_of(pos, struct fence, child_list);
 151                 sync_print_fence(s, fence, false);
 152         }
 153         spin_unlock_irqrestore(&obj->child_list_lock, flags);
 154 }
 155
 156 static void sync_print_sync_file(struct seq_file *s,
 157                                   struct sync_file *sync_file)
 158 {
 159         int i;
 160
 161         seq_printf(s, "[%p] %s: %s\n", sync_file, sync_file->name,
 162                    sync_status_str(atomic_read(&sync_file->status)));
 163
 164         for (i = 0; i < sync_file->num_fences; ++i)
 165                 sync_print_fence(s, sync_file->cbs[i].fence, true);
 166 }
 167
 168 static int sync_debugfs_show(struct seq_file *s, void *unused)
 169 {
 170         unsigned long flags;
 171         struct list_head *pos;
 172
 173         seq_puts(s, "objs:\n--------------\n");
 174
 175         spin_lock_irqsave(&sync_timeline_list_lock, flags);
 176         list_for_each(pos, &sync_timeline_list_head) {
 177                 struct sync_timeline *obj =
 178                         container_of(pos, struct sync_timeline,
 179                                      sync_timeline_list);
 180
 181                 sync_print_obj(s, obj);
 182                 seq_puts(s, "\n");
 183         }
 184         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
 185
 186         seq_puts(s, "fences:\n--------------\n");
 187
 188         spin_lock_irqsave(&sync_file_list_lock, flags);
 189         list_for_each(pos, &sync_file_list_head) {
 190                 struct sync_file *sync_file =
 191                         container_of(pos, struct sync_file, sync_file_list);
 192
 193                 sync_print_sync_file(s, sync_file);
 194                 seq_puts(s, "\n");
 195         }
 196         spin_unlock_irqrestore(&sync_file_list_lock, flags);
 197         return 0;
 198 }
 199
 200 static int sync_info_debugfs_open(struct inode *inode, struct file *file)
 201 {
 202         return single_open(file, sync_debugfs_show, inode->i_private);
 203 }
 204
 205 static const struct file_operations sync_info_debugfs_fops = {
 206         .open           = sync_info_debugfs_open,
 207         .read           = seq_read,
 208         .llseek         = seq_lseek,
 209         .release        = single_release,
 210 };
 211
 212 /*
 213  * *WARNING*
 214  *
 215  * improper use of this can result in deadlocking kernel drivers from userspace.
 216  */
 217
 218 /* opening sw_sync create a new sync obj */
 219 static int sw_sync_debugfs_open(struct inode *inode, struct file *file)
 220 {
 221         struct sw_sync_timeline *obj;
 222         char task_comm[TASK_COMM_LEN];
 223
 224         get_task_comm(task_comm, current);
 225
 226         obj = sw_sync_timeline_create(task_comm);
 227         if (!obj)
 228                 return -ENOMEM;
 229
 230         file->private_data = obj;
 231
 232         return 0;
 233 }
 234
 235 static int sw_sync_debugfs_release(struct inode *inode, struct file *file)
 236 {
 237         struct sw_sync_timeline *obj = file->private_data;
 238
 239         sync_timeline_destroy(&obj->obj);
 240         return 0;
 241 }
 242
 243 static long sw_sync_ioctl_create_fence(struct sw_sync_timeline *obj,
 244                                        unsigned long arg)
 245 {
 246         int fd = get_unused_fd_flags(O_CLOEXEC);
 247         int err;
 248         struct fence *fence;
 249         struct sync_file *sync_file;
 250         struct sw_sync_create_fence_data data;
 251
 252         if (fd < 0)
 253                 return fd;
 254
 255         if (copy_from_user(&data, (void __user *)arg, sizeof(data))) {
 256                 err = -EFAULT;
 257                 goto err;
 258         }
 259
 260         fence = sw_sync_pt_create(obj, data.value);
 261         if (!fence) {
 262                 err = -ENOMEM;
 263                 goto err;
 264         }
 265
 266         sync_file = sync_file_create(fence);
 267         if (!sync_file) {
 268                 fence_put(fence);
 269                 err = -ENOMEM;
 270                 goto err;
 271         }
 272
 273         data.fence = fd;
 274         if (copy_to_user((void __user *)arg, &data, sizeof(data))) {
 275                 fput(sync_file->file);
 276                 err = -EFAULT;
 277                 goto err;
 278         }
 279
 280         fd_install(fd, sync_file->file);
 281
 282         return 0;
 283
 284 err:
 285         put_unused_fd(fd);
 286         return err;
 287 }
 288
 289 static long sw_sync_ioctl_inc(struct sw_sync_timeline *obj, unsigned long arg)
 290 {
 291         u32 value;
 292
 293         if (copy_from_user(&value, (void __user *)arg, sizeof(value)))
 294                 return -EFAULT;
 295
 296         sw_sync_timeline_inc(obj, value);
 297
 298         return 0;
 299 }
 300
 301 static long sw_sync_ioctl(struct file *file, unsigned int cmd,
 302                           unsigned long arg)
 303 {
 304         struct sw_sync_timeline *obj = file->private_data;
 305
 306         switch (cmd) {
 307         case SW_SYNC_IOC_CREATE_FENCE:
 308                 return sw_sync_ioctl_create_fence(obj, arg);
 309
 310         case SW_SYNC_IOC_INC:
 311                 return sw_sync_ioctl_inc(obj, arg);
 312
 313         default:
 314                 return -ENOTTY;
 315         }
 316 }
 317
 318 static const struct file_operations sw_sync_debugfs_fops = {
 319         .open           = sw_sync_debugfs_open,
 320         .release        = sw_sync_debugfs_release,
 321         .unlocked_ioctl = sw_sync_ioctl,
 322         .compat_ioctl = sw_sync_ioctl,
 323 };
 324
 325 static __init int sync_debugfs_init(void)
 326 {
 327         dbgfs = debugfs_create_dir("sync", NULL);
 328
 329         debugfs_create_file("info", 0444, dbgfs, NULL, &sync_info_debugfs_fops);
 330         debugfs_create_file("sw_sync", 0644, dbgfs, NULL,
 331                             &sw_sync_debugfs_fops);
 332
 333         return 0;
 334 }
 335 late_initcall(sync_debugfs_init);
 336
 337 #define DUMP_CHUNK 256
 338 static char sync_dump_buf[64 * 1024];
 339 void sync_dump(void)
 340 {
 341         struct seq_file s = {
 342                 .buf = sync_dump_buf,
 343                 .size = sizeof(sync_dump_buf) - 1,
 344         };
 345         int i;
 346
 347         sync_debugfs_show(&s, NULL);
 348
 349         for (i = 0; i < s.count; i += DUMP_CHUNK) {
 350                 if ((s.count - i) > DUMP_CHUNK) {
 351                         char c = s.buf[i + DUMP_CHUNK];
 352
 353                         s.buf[i + DUMP_CHUNK] = 0;
 354                         pr_cont("%s", s.buf + i);
 355                         s.buf[i + DUMP_CHUNK] = c;
 356                 } else {
 357                         s.buf[s.count] = 0;
 358                         pr_cont("%s", s.buf + i);
 359                 }
 360         }
 361 }
 362
 363 #endif