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