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: %d\n", obj->name, obj->drv_name, obj->value);
 137
 138         spin_lock_irqsave(&obj->child_list_lock, flags);
 139         list_for_each(pos, &obj->child_list_head) {
 140                 struct fence *fence =
 141                         container_of(pos, struct fence, child_list);
 142                 sync_print_fence(s, fence, false);
 143         }
 144         spin_unlock_irqrestore(&obj->child_list_lock, flags);
 145 }
 146
 147 static void sync_print_sync_file(struct seq_file *s,
 148                                   struct sync_file *sync_file)
 149 {
 150         int i;
 151
 152         seq_printf(s, "[%p] %s: %s\n", sync_file, sync_file->name,
 153                    sync_status_str(atomic_read(&sync_file->status)));
 154
 155         for (i = 0; i < sync_file->num_fences; ++i)
 156                 sync_print_fence(s, sync_file->cbs[i].fence, true);
 157 }
 158
 159 static int sync_debugfs_show(struct seq_file *s, void *unused)
 160 {
 161         unsigned long flags;
 162         struct list_head *pos;
 163
 164         seq_puts(s, "objs:\n--------------\n");
 165
 166         spin_lock_irqsave(&sync_timeline_list_lock, flags);
 167         list_for_each(pos, &sync_timeline_list_head) {
 168                 struct sync_timeline *obj =
 169                         container_of(pos, struct sync_timeline,
 170                                      sync_timeline_list);
 171
 172                 sync_print_obj(s, obj);
 173                 seq_puts(s, "\n");
 174         }
 175         spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
 176
 177         seq_puts(s, "fences:\n--------------\n");
 178
 179         spin_lock_irqsave(&sync_file_list_lock, flags);
 180         list_for_each(pos, &sync_file_list_head) {
 181                 struct sync_file *sync_file =
 182                         container_of(pos, struct sync_file, sync_file_list);
 183
 184                 sync_print_sync_file(s, sync_file);
 185                 seq_puts(s, "\n");
 186         }
 187         spin_unlock_irqrestore(&sync_file_list_lock, flags);
 188         return 0;
 189 }
 190
 191 static int sync_info_debugfs_open(struct inode *inode, struct file *file)
 192 {
 193         return single_open(file, sync_debugfs_show, inode->i_private);
 194 }
 195
 196 static const struct file_operations sync_info_debugfs_fops = {
 197         .open           = sync_info_debugfs_open,
 198         .read           = seq_read,
 199         .llseek         = seq_lseek,
 200         .release        = single_release,
 201 };
 202
 203 /*
 204  * *WARNING*
 205  *
 206  * improper use of this can result in deadlocking kernel drivers from userspace.
 207  */
 208
 209 /* opening sw_sync create a new sync obj */
 210 static int sw_sync_debugfs_open(struct inode *inode, struct file *file)
 211 {
 212         struct sw_sync_timeline *obj;
 213         char task_comm[TASK_COMM_LEN];
 214
 215         get_task_comm(task_comm, current);
 216
 217         obj = sw_sync_timeline_create(task_comm);
 218         if (!obj)
 219                 return -ENOMEM;
 220
 221         file->private_data = obj;
 222
 223         return 0;
 224 }
 225
 226 static int sw_sync_debugfs_release(struct inode *inode, struct file *file)
 227 {
 228         struct sw_sync_timeline *obj = file->private_data;
 229
 230         sync_timeline_destroy(&obj->obj);
 231         return 0;
 232 }
 233
 234 static long sw_sync_ioctl_create_fence(struct sw_sync_timeline *obj,
 235                                        unsigned long arg)
 236 {
 237         int fd = get_unused_fd_flags(O_CLOEXEC);
 238         int err;
 239         struct fence *fence;
 240         struct sync_file *sync_file;
 241         struct sw_sync_create_fence_data data;
 242
 243         if (fd < 0)
 244                 return fd;
 245
 246         if (copy_from_user(&data, (void __user *)arg, sizeof(data))) {
 247                 err = -EFAULT;
 248                 goto err;
 249         }
 250
 251         fence = sw_sync_pt_create(obj, data.value);
 252         if (!fence) {
 253                 err = -ENOMEM;
 254                 goto err;
 255         }
 256
 257         sync_file = sync_file_create(fence);
 258         if (!sync_file) {
 259                 fence_put(fence);
 260                 err = -ENOMEM;
 261                 goto err;
 262         }
 263
 264         data.fence = fd;
 265         if (copy_to_user((void __user *)arg, &data, sizeof(data))) {
 266                 fput(sync_file->file);
 267                 err = -EFAULT;
 268                 goto err;
 269         }
 270
 271         fd_install(fd, sync_file->file);
 272
 273         return 0;
 274
 275 err:
 276         put_unused_fd(fd);
 277         return err;
 278 }
 279
 280 static long sw_sync_ioctl_inc(struct sw_sync_timeline *obj, unsigned long arg)
 281 {
 282         u32 value;
 283
 284         if (copy_from_user(&value, (void __user *)arg, sizeof(value)))
 285                 return -EFAULT;
 286
 287         sw_sync_timeline_inc(obj, value);
 288
 289         return 0;
 290 }
 291
 292 static long sw_sync_ioctl(struct file *file, unsigned int cmd,
 293                           unsigned long arg)
 294 {
 295         struct sw_sync_timeline *obj = file->private_data;
 296
 297         switch (cmd) {
 298         case SW_SYNC_IOC_CREATE_FENCE:
 299                 return sw_sync_ioctl_create_fence(obj, arg);
 300
 301         case SW_SYNC_IOC_INC:
 302                 return sw_sync_ioctl_inc(obj, arg);
 303
 304         default:
 305                 return -ENOTTY;
 306         }
 307 }
 308
 309 static const struct file_operations sw_sync_debugfs_fops = {
 310         .open           = sw_sync_debugfs_open,
 311         .release        = sw_sync_debugfs_release,
 312         .unlocked_ioctl = sw_sync_ioctl,
 313         .compat_ioctl = sw_sync_ioctl,
 314 };
 315
 316 static __init int sync_debugfs_init(void)
 317 {
 318         dbgfs = debugfs_create_dir("sync", NULL);
 319
 320         debugfs_create_file("info", 0444, dbgfs, NULL, &sync_info_debugfs_fops);
 321         debugfs_create_file("sw_sync", 0644, dbgfs, NULL,
 322                             &sw_sync_debugfs_fops);
 323
 324         return 0;
 325 }
 326 late_initcall(sync_debugfs_init);
 327
 328 #define DUMP_CHUNK 256
 329 static char sync_dump_buf[64 * 1024];
 330 void sync_dump(void)
 331 {
 332         struct seq_file s = {
 333                 .buf = sync_dump_buf,
 334                 .size = sizeof(sync_dump_buf) - 1,
 335         };
 336         int i;
 337
 338         sync_debugfs_show(&s, NULL);
 339
 340         for (i = 0; i < s.count; i += DUMP_CHUNK) {
 341                 if ((s.count - i) > DUMP_CHUNK) {
 342                         char c = s.buf[i + DUMP_CHUNK];
 343
 344                         s.buf[i + DUMP_CHUNK] = 0;
 345                         pr_cont("%s", s.buf + i);
 346                         s.buf[i + DUMP_CHUNK] = c;
 347                 } else {
 348                         s.buf[s.count] = 0;
 349                         pr_cont("%s", s.buf + i);
 350                 }
 351         }
 352 }
 353
 354 #endif