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 "sw_sync.h"
  30
  31 #ifdef CONFIG_DEBUG_FS
  32
  33 static struct dentry *dbgfs;
  34
  35 static LIST_HEAD(sync_timeline_list_head);
  36 static DEFINE_SPINLOCK(sync_timeline_list_lock);
  37 static LIST_HEAD(sync_file_list_head);
  38 static DEFINE_SPINLOCK(sync_file_list_lock);
  39
  40 void sync_timeline_debug_add(struct sync_timeline *obj)
  41 {
  42         unsigned long flags;
  43
  44         spin_lock_irqsave(&sync_timeline_list_lock, flags);
  45         list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head);
  46         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
  47 }
  48
  49 void sync_timeline_debug_remove(struct sync_timeline *obj)
  50 {
  51         unsigned long flags;
  52
  53         spin_lock_irqsave(&sync_timeline_list_lock, flags);
  54         list_del(&obj->sync_timeline_list);
  55         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
  56 }
  57
  58 void sync_file_debug_add(struct sync_file *sync_file)
  59 {
  60         unsigned long flags;
  61
  62         spin_lock_irqsave(&sync_file_list_lock, flags);
  63         list_add_tail(&sync_file->sync_file_list, &sync_file_list_head);
  64         spin_unlock_irqrestore(&sync_file_list_lock, flags);
  65 }
  66
  67 void sync_file_debug_remove(struct sync_file *sync_file)
  68 {
  69         unsigned long flags;
  70
  71         spin_lock_irqsave(&sync_file_list_lock, flags);
  72         list_del(&sync_file->sync_file_list);
  73         spin_unlock_irqrestore(&sync_file_list_lock, flags);
  74 }
  75
  76 static const char *sync_status_str(int status)
  77 {
  78         if (status == 0)
  79                 return "signaled";
  80
  81         if (status > 0)
  82                 return "active";
  83
  84         return "error";
  85 }
  86
  87 static void sync_print_fence(struct seq_file *s, struct fence *fence, bool show)
  88 {
  89         int status = 1;
  90         struct sync_timeline *parent = fence_parent(fence);
  91
  92         if (fence_is_signaled_locked(fence))
  93                 status = fence->status;
  94
  95         seq_printf(s, "  %s%sfence %s",
  96                    show ? parent->name : "",
  97                    show ? "_" : "",
  98                    sync_status_str(status));
  99
 100         if (status <= 0) {
 101                 struct timespec64 ts64 =
 102                         ktime_to_timespec64(fence->timestamp);
 103
 104                 seq_printf(s, "@%lld.%09ld", (s64)ts64.tv_sec, ts64.tv_nsec);
 105         }
 106
 107         if ((!fence || fence->ops->timeline_value_str) &&
 108                 fence->ops->fence_value_str) {
 109                 char value[64];
 110                 bool success;
 111
 112                 fence->ops->fence_value_str(fence, value, sizeof(value));
 113                 success = strlen(value);
 114
 115                 if (success)
 116                         seq_printf(s, ": %s", value);
 117
 118                 if (success && fence) {
 119                         fence->ops->timeline_value_str(fence, value,
 120                                                        sizeof(value));
 121
 122                         if (strlen(value))
 123                                 seq_printf(s, " / %s", value);
 124                 }
 125         }
 126
 127         seq_puts(s, "\n");
 128 }
 129
 130 static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
 131 {
 132         struct list_head *pos;
 133         unsigned long flags;
 134
 135         seq_printf(s, "%s %s", obj->name, obj->ops->driver_name);
 136
 137         if (obj->ops->timeline_value_str) {
 138                 char value[64];
 139
 140                 obj->ops->timeline_value_str(obj, value, sizeof(value));
 141                 seq_printf(s, ": %s", value);
 142         }
 143
 144         seq_puts(s, "\n");
 145
 146         spin_lock_irqsave(&obj->child_list_lock, flags);
 147         list_for_each(pos, &obj->child_list_head) {
 148                 struct fence *fence =
 149                         container_of(pos, struct fence, child_list);
 150                 sync_print_fence(s, fence, false);
 151         }
 152         spin_unlock_irqrestore(&obj->child_list_lock, flags);
 153 }
 154
 155 static void sync_print_sync_file(struct seq_file *s,
 156                                   struct sync_file *sync_file)
 157 {
 158         int i;
 159
 160         seq_printf(s, "[%p] %s: %s\n", sync_file, sync_file->name,
 161                    sync_status_str(atomic_read(&sync_file->status)));
 162
 163         for (i = 0; i < sync_file->num_fences; ++i)
 164                 sync_print_fence(s, sync_file->cbs[i].fence, true);
 165 }
 166
 167 static int sync_debugfs_show(struct seq_file *s, void *unused)
 168 {
 169         unsigned long flags;
 170         struct list_head *pos;
 171
 172         seq_puts(s, "objs:\n--------------\n");
 173
 174         spin_lock_irqsave(&sync_timeline_list_lock, flags);
 175         list_for_each(pos, &sync_timeline_list_head) {
 176                 struct sync_timeline *obj =
 177                         container_of(pos, struct sync_timeline,
 178                                      sync_timeline_list);
 179
 180                 sync_print_obj(s, obj);
 181                 seq_puts(s, "\n");
 182         }
 183         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
 184
 185         seq_puts(s, "fences:\n--------------\n");
 186
 187         spin_lock_irqsave(&sync_file_list_lock, flags);
 188         list_for_each(pos, &sync_file_list_head) {
 189                 struct sync_file *sync_file =
 190                         container_of(pos, struct sync_file, sync_file_list);
 191
 192                 sync_print_sync_file(s, sync_file);
 193                 seq_puts(s, "\n");
 194         }
 195         spin_unlock_irqrestore(&sync_file_list_lock, flags);
 196         return 0;
 197 }
 198
 199 static int sync_info_debugfs_open(struct inode *inode, struct file *file)
 200 {
 201         return single_open(file, sync_debugfs_show, inode->i_private);
 202 }
 203
 204 static const struct file_operations sync_info_debugfs_fops = {
 205         .open           = sync_info_debugfs_open,
 206         .read           = seq_read,
 207         .llseek         = seq_lseek,
 208         .release        = single_release,
 209 };
 210
 211 /*
 212  * *WARNING*
 213  *
 214  * improper use of this can result in deadlocking kernel drivers from userspace.
 215  */
 216
 217 /* opening sw_sync create a new sync obj */
 218 static int sw_sync_debugfs_open(struct inode *inode, struct file *file)
 219 {
 220         struct sw_sync_timeline *obj;
 221         char task_comm[TASK_COMM_LEN];
 222
 223         get_task_comm(task_comm, current);
 224
 225         obj = sw_sync_timeline_create(task_comm);
 226         if (!obj)
 227                 return -ENOMEM;
 228
 229         file->private_data = obj;
 230
 231         return 0;
 232 }
 233
 234 static int sw_sync_debugfs_release(struct inode *inode, struct file *file)
 235 {
 236         struct sw_sync_timeline *obj = file->private_data;
 237
 238         sync_timeline_destroy(&obj->obj);
 239         return 0;
 240 }
 241
 242 static long sw_sync_ioctl_create_fence(struct sw_sync_timeline *obj,
 243                                        unsigned long arg)
 244 {
 245         int fd = get_unused_fd_flags(O_CLOEXEC);
 246         int err;
 247         struct fence *fence;
 248         struct sync_file *sync_file;
 249         struct sw_sync_create_fence_data data;
 250
 251         if (fd < 0)
 252                 return fd;
 253
 254         if (copy_from_user(&data, (void __user *)arg, sizeof(data))) {
 255                 err = -EFAULT;
 256                 goto err;
 257         }
 258
 259         fence = sw_sync_pt_create(obj, data.value);
 260         if (!fence) {
 261                 err = -ENOMEM;
 262                 goto err;
 263         }
 264
 265         data.name[sizeof(data.name) - 1] = '\0';
 266         sync_file = sync_file_create(data.name, 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                 sync_file_put(sync_file);
 276                 err = -EFAULT;
 277                 goto err;
 278         }
 279
 280         sync_file_install(sync_file, fd);
 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