sync.c revision 1d5db2ce93089db91d7997927b4cfd92a88c5aad
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 29#include "sync.h" 30 31static void sync_fence_signal_pt(struct sync_pt *pt); 32static int _sync_pt_has_signaled(struct sync_pt *pt); 33static void sync_fence_free(struct kref *kref); 34static void sync_dump(void); 35 36static LIST_HEAD(sync_timeline_list_head); 37static DEFINE_SPINLOCK(sync_timeline_list_lock); 38 39static LIST_HEAD(sync_fence_list_head); 40static DEFINE_SPINLOCK(sync_fence_list_lock); 41 42struct sync_timeline *sync_timeline_create(const struct sync_timeline_ops *ops, 43 int size, const char *name) 44{ 45 struct sync_timeline *obj; 46 unsigned long flags; 47 48 if (size < sizeof(struct sync_timeline)) 49 return NULL; 50 51 obj = kzalloc(size, GFP_KERNEL); 52 if (obj == NULL) 53 return NULL; 54 55 kref_init(&obj->kref); 56 obj->ops = ops; 57 strlcpy(obj->name, name, sizeof(obj->name)); 58 59 INIT_LIST_HEAD(&obj->child_list_head); 60 spin_lock_init(&obj->child_list_lock); 61 62 INIT_LIST_HEAD(&obj->active_list_head); 63 spin_lock_init(&obj->active_list_lock); 64 65 spin_lock_irqsave(&sync_timeline_list_lock, flags); 66 list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head); 67 spin_unlock_irqrestore(&sync_timeline_list_lock, flags); 68 69 return obj; 70} 71EXPORT_SYMBOL(sync_timeline_create); 72 73static void sync_timeline_free(struct kref *kref) 74{ 75 struct sync_timeline *obj = 76 container_of(kref, struct sync_timeline, kref); 77 unsigned long flags; 78 79 if (obj->ops->release_obj) 80 obj->ops->release_obj(obj); 81 82 spin_lock_irqsave(&sync_timeline_list_lock, flags); 83 list_del(&obj->sync_timeline_list); 84 spin_unlock_irqrestore(&sync_timeline_list_lock, flags); 85 86 kfree(obj); 87} 88 89void sync_timeline_destroy(struct sync_timeline *obj) 90{ 91 obj->destroyed = true; 92 93 /* 94 * If this is not the last reference, signal any children 95 * that their parent is going away. 96 */ 97 98 if (!kref_put(&obj->kref, sync_timeline_free)) 99 sync_timeline_signal(obj); 100} 101EXPORT_SYMBOL(sync_timeline_destroy); 102 103static void sync_timeline_add_pt(struct sync_timeline *obj, struct sync_pt *pt) 104{ 105 unsigned long flags; 106 107 pt->parent = obj; 108 109 spin_lock_irqsave(&obj->child_list_lock, flags); 110 list_add_tail(&pt->child_list, &obj->child_list_head); 111 spin_unlock_irqrestore(&obj->child_list_lock, flags); 112} 113 114static void sync_timeline_remove_pt(struct sync_pt *pt) 115{ 116 struct sync_timeline *obj = pt->parent; 117 unsigned long flags; 118 119 spin_lock_irqsave(&obj->active_list_lock, flags); 120 if (!list_empty(&pt->active_list)) 121 list_del_init(&pt->active_list); 122 spin_unlock_irqrestore(&obj->active_list_lock, flags); 123 124 spin_lock_irqsave(&obj->child_list_lock, flags); 125 if (!list_empty(&pt->child_list)) { 126 list_del_init(&pt->child_list); 127 } 128 spin_unlock_irqrestore(&obj->child_list_lock, flags); 129} 130 131void sync_timeline_signal(struct sync_timeline *obj) 132{ 133 unsigned long flags; 134 LIST_HEAD(signaled_pts); 135 struct list_head *pos, *n; 136 137 spin_lock_irqsave(&obj->active_list_lock, flags); 138 139 list_for_each_safe(pos, n, &obj->active_list_head) { 140 struct sync_pt *pt = 141 container_of(pos, struct sync_pt, active_list); 142 143 if (_sync_pt_has_signaled(pt)) { 144 list_del_init(pos); 145 list_add(&pt->signaled_list, &signaled_pts); 146 kref_get(&pt->fence->kref); 147 } 148 } 149 150 spin_unlock_irqrestore(&obj->active_list_lock, flags); 151 152 list_for_each_safe(pos, n, &signaled_pts) { 153 struct sync_pt *pt = 154 container_of(pos, struct sync_pt, signaled_list); 155 156 list_del_init(pos); 157 sync_fence_signal_pt(pt); 158 kref_put(&pt->fence->kref, sync_fence_free); 159 } 160} 161EXPORT_SYMBOL(sync_timeline_signal); 162 163struct sync_pt *sync_pt_create(struct sync_timeline *parent, int size) 164{ 165 struct sync_pt *pt; 166 167 if (size < sizeof(struct sync_pt)) 168 return NULL; 169 170 pt = kzalloc(size, GFP_KERNEL); 171 if (pt == NULL) 172 return NULL; 173 174 INIT_LIST_HEAD(&pt->active_list); 175 kref_get(&parent->kref); 176 sync_timeline_add_pt(parent, pt); 177 178 return pt; 179} 180EXPORT_SYMBOL(sync_pt_create); 181 182void sync_pt_free(struct sync_pt *pt) 183{ 184 if (pt->parent->ops->free_pt) 185 pt->parent->ops->free_pt(pt); 186 187 sync_timeline_remove_pt(pt); 188 189 kref_put(&pt->parent->kref, sync_timeline_free); 190 191 kfree(pt); 192} 193EXPORT_SYMBOL(sync_pt_free); 194 195/* call with pt->parent->active_list_lock held */ 196static int _sync_pt_has_signaled(struct sync_pt *pt) 197{ 198 int old_status = pt->status; 199 200 if (!pt->status) 201 pt->status = pt->parent->ops->has_signaled(pt); 202 203 if (!pt->status && pt->parent->destroyed) 204 pt->status = -ENOENT; 205 206 if (pt->status != old_status) 207 pt->timestamp = ktime_get(); 208 209 return pt->status; 210} 211 212static struct sync_pt *sync_pt_dup(struct sync_pt *pt) 213{ 214 return pt->parent->ops->dup(pt); 215} 216 217/* Adds a sync pt to the active queue. Called when added to a fence */ 218static void sync_pt_activate(struct sync_pt *pt) 219{ 220 struct sync_timeline *obj = pt->parent; 221 unsigned long flags; 222 int err; 223 224 spin_lock_irqsave(&obj->active_list_lock, flags); 225 226 err = _sync_pt_has_signaled(pt); 227 if (err != 0) 228 goto out; 229 230 list_add_tail(&pt->active_list, &obj->active_list_head); 231 232out: 233 spin_unlock_irqrestore(&obj->active_list_lock, flags); 234} 235 236static int sync_fence_release(struct inode *inode, struct file *file); 237static unsigned int sync_fence_poll(struct file *file, poll_table *wait); 238static long sync_fence_ioctl(struct file *file, unsigned int cmd, 239 unsigned long arg); 240 241 242static const struct file_operations sync_fence_fops = { 243 .release = sync_fence_release, 244 .poll = sync_fence_poll, 245 .unlocked_ioctl = sync_fence_ioctl, 246}; 247 248static struct sync_fence *sync_fence_alloc(const char *name) 249{ 250 struct sync_fence *fence; 251 unsigned long flags; 252 253 fence = kzalloc(sizeof(struct sync_fence), GFP_KERNEL); 254 if (fence == NULL) 255 return NULL; 256 257 fence->file = anon_inode_getfile("sync_fence", &sync_fence_fops, 258 fence, 0); 259 if (fence->file == NULL) 260 goto err; 261 262 kref_init(&fence->kref); 263 strlcpy(fence->name, name, sizeof(fence->name)); 264 265 INIT_LIST_HEAD(&fence->pt_list_head); 266 INIT_LIST_HEAD(&fence->waiter_list_head); 267 spin_lock_init(&fence->waiter_list_lock); 268 269 init_waitqueue_head(&fence->wq); 270 271 spin_lock_irqsave(&sync_fence_list_lock, flags); 272 list_add_tail(&fence->sync_fence_list, &sync_fence_list_head); 273 spin_unlock_irqrestore(&sync_fence_list_lock, flags); 274 275 return fence; 276 277err: 278 kfree(fence); 279 return NULL; 280} 281 282/* TODO: implement a create which takes more that one sync_pt */ 283struct sync_fence *sync_fence_create(const char *name, struct sync_pt *pt) 284{ 285 struct sync_fence *fence; 286 287 if (pt->fence) 288 return NULL; 289 290 fence = sync_fence_alloc(name); 291 if (fence == NULL) 292 return NULL; 293 294 pt->fence = fence; 295 list_add(&pt->pt_list, &fence->pt_list_head); 296 sync_pt_activate(pt); 297 298 return fence; 299} 300EXPORT_SYMBOL(sync_fence_create); 301 302static int sync_fence_copy_pts(struct sync_fence *dst, struct sync_fence *src) 303{ 304 struct list_head *pos; 305 306 list_for_each(pos, &src->pt_list_head) { 307 struct sync_pt *orig_pt = 308 container_of(pos, struct sync_pt, pt_list); 309 struct sync_pt *new_pt = sync_pt_dup(orig_pt); 310 311 if (new_pt == NULL) 312 return -ENOMEM; 313 314 new_pt->fence = dst; 315 list_add(&new_pt->pt_list, &dst->pt_list_head); 316 sync_pt_activate(new_pt); 317 } 318 319 return 0; 320} 321 322static int sync_fence_merge_pts(struct sync_fence *dst, struct sync_fence *src) 323{ 324 struct list_head *src_pos, *dst_pos, *n; 325 326 list_for_each(src_pos, &src->pt_list_head) { 327 struct sync_pt *src_pt = 328 container_of(src_pos, struct sync_pt, pt_list); 329 bool collapsed = false; 330 331 list_for_each_safe(dst_pos, n, &dst->pt_list_head) { 332 struct sync_pt *dst_pt = 333 container_of(dst_pos, struct sync_pt, pt_list); 334 /* collapse two sync_pts on the same timeline 335 * to a single sync_pt that will signal at 336 * the later of the two 337 */ 338 if (dst_pt->parent == src_pt->parent) { 339 if (dst_pt->parent->ops->compare(dst_pt, src_pt) 340 == -1) { 341 struct sync_pt *new_pt = 342 sync_pt_dup(src_pt); 343 if (new_pt == NULL) 344 return -ENOMEM; 345 346 new_pt->fence = dst; 347 list_replace(&dst_pt->pt_list, 348 &new_pt->pt_list); 349 sync_pt_activate(new_pt); 350 sync_pt_free(dst_pt); 351 } 352 collapsed = true; 353 break; 354 } 355 } 356 357 if (!collapsed) { 358 struct sync_pt *new_pt = sync_pt_dup(src_pt); 359 360 if (new_pt == NULL) 361 return -ENOMEM; 362 363 new_pt->fence = dst; 364 list_add(&new_pt->pt_list, &dst->pt_list_head); 365 sync_pt_activate(new_pt); 366 } 367 } 368 369 return 0; 370} 371 372static void sync_fence_detach_pts(struct sync_fence *fence) 373{ 374 struct list_head *pos, *n; 375 376 list_for_each_safe(pos, n, &fence->pt_list_head) { 377 struct sync_pt *pt = container_of(pos, struct sync_pt, pt_list); 378 sync_timeline_remove_pt(pt); 379 } 380} 381 382static void sync_fence_free_pts(struct sync_fence *fence) 383{ 384 struct list_head *pos, *n; 385 386 list_for_each_safe(pos, n, &fence->pt_list_head) { 387 struct sync_pt *pt = container_of(pos, struct sync_pt, pt_list); 388 sync_pt_free(pt); 389 } 390} 391 392struct sync_fence *sync_fence_fdget(int fd) 393{ 394 struct file *file = fget(fd); 395 396 if (file == NULL) 397 return NULL; 398 399 if (file->f_op != &sync_fence_fops) 400 goto err; 401 402 return file->private_data; 403 404err: 405 fput(file); 406 return NULL; 407} 408EXPORT_SYMBOL(sync_fence_fdget); 409 410void sync_fence_put(struct sync_fence *fence) 411{ 412 fput(fence->file); 413} 414EXPORT_SYMBOL(sync_fence_put); 415 416void sync_fence_install(struct sync_fence *fence, int fd) 417{ 418 fd_install(fd, fence->file); 419} 420EXPORT_SYMBOL(sync_fence_install); 421 422static int sync_fence_get_status(struct sync_fence *fence) 423{ 424 struct list_head *pos; 425 int status = 1; 426 427 list_for_each(pos, &fence->pt_list_head) { 428 struct sync_pt *pt = container_of(pos, struct sync_pt, pt_list); 429 int pt_status = pt->status; 430 431 if (pt_status < 0) { 432 status = pt_status; 433 break; 434 } else if (status == 1) { 435 status = pt_status; 436 } 437 } 438 439 return status; 440} 441 442struct sync_fence *sync_fence_merge(const char *name, 443 struct sync_fence *a, struct sync_fence *b) 444{ 445 struct sync_fence *fence; 446 int err; 447 448 fence = sync_fence_alloc(name); 449 if (fence == NULL) 450 return NULL; 451 452 err = sync_fence_copy_pts(fence, a); 453 if (err < 0) 454 goto err; 455 456 err = sync_fence_merge_pts(fence, b); 457 if (err < 0) 458 goto err; 459 460 fence->status = sync_fence_get_status(fence); 461 462 return fence; 463err: 464 sync_fence_free_pts(fence); 465 kfree(fence); 466 return NULL; 467} 468EXPORT_SYMBOL(sync_fence_merge); 469 470static void sync_fence_signal_pt(struct sync_pt *pt) 471{ 472 LIST_HEAD(signaled_waiters); 473 struct sync_fence *fence = pt->fence; 474 struct list_head *pos; 475 struct list_head *n; 476 unsigned long flags; 477 int status; 478 479 status = sync_fence_get_status(fence); 480 481 spin_lock_irqsave(&fence->waiter_list_lock, flags); 482 /* 483 * this should protect against two threads racing on the signaled 484 * false -> true transition 485 */ 486 if (status && !fence->status) { 487 list_for_each_safe(pos, n, &fence->waiter_list_head) 488 list_move(pos, &signaled_waiters); 489 490 fence->status = status; 491 } else { 492 status = 0; 493 } 494 spin_unlock_irqrestore(&fence->waiter_list_lock, flags); 495 496 if (status) { 497 list_for_each_safe(pos, n, &signaled_waiters) { 498 struct sync_fence_waiter *waiter = 499 container_of(pos, struct sync_fence_waiter, 500 waiter_list); 501 502 list_del(pos); 503 waiter->callback(fence, waiter); 504 } 505 wake_up(&fence->wq); 506 } 507} 508 509int sync_fence_wait_async(struct sync_fence *fence, 510 struct sync_fence_waiter *waiter) 511{ 512 unsigned long flags; 513 int err = 0; 514 515 spin_lock_irqsave(&fence->waiter_list_lock, flags); 516 517 if (fence->status) { 518 err = fence->status; 519 goto out; 520 } 521 522 list_add_tail(&waiter->waiter_list, &fence->waiter_list_head); 523out: 524 spin_unlock_irqrestore(&fence->waiter_list_lock, flags); 525 526 return err; 527} 528EXPORT_SYMBOL(sync_fence_wait_async); 529 530int sync_fence_cancel_async(struct sync_fence *fence, 531 struct sync_fence_waiter *waiter) 532{ 533 struct list_head *pos; 534 struct list_head *n; 535 unsigned long flags; 536 int ret = -ENOENT; 537 538 spin_lock_irqsave(&fence->waiter_list_lock, flags); 539 /* 540 * Make sure waiter is still in waiter_list because it is possible for 541 * the waiter to be removed from the list while the callback is still 542 * pending. 543 */ 544 list_for_each_safe(pos, n, &fence->waiter_list_head) { 545 struct sync_fence_waiter *list_waiter = 546 container_of(pos, struct sync_fence_waiter, 547 waiter_list); 548 if (list_waiter == waiter) { 549 list_del(pos); 550 ret = 0; 551 break; 552 } 553 } 554 spin_unlock_irqrestore(&fence->waiter_list_lock, flags); 555 return ret; 556} 557EXPORT_SYMBOL(sync_fence_cancel_async); 558 559int sync_fence_wait(struct sync_fence *fence, long timeout) 560{ 561 int err = 0; 562 563 if (timeout > 0) { 564 timeout = msecs_to_jiffies(timeout); 565 err = wait_event_interruptible_timeout(fence->wq, 566 fence->status != 0, 567 timeout); 568 } else if (timeout < 0) { 569 err = wait_event_interruptible(fence->wq, fence->status != 0); 570 } 571 572 if (err < 0) 573 return err; 574 575 if (fence->status < 0) 576 return fence->status; 577 578 if (fence->status == 0) { 579 pr_info("fence timeout on [%p] after %dms\n", fence, 580 jiffies_to_msecs(timeout)); 581 sync_dump(); 582 return -ETIME; 583 } 584 585 return 0; 586} 587EXPORT_SYMBOL(sync_fence_wait); 588 589static void sync_fence_free(struct kref *kref) 590{ 591 struct sync_fence *fence = container_of(kref, struct sync_fence, kref); 592 593 sync_fence_free_pts(fence); 594 595 kfree(fence); 596} 597 598static int sync_fence_release(struct inode *inode, struct file *file) 599{ 600 struct sync_fence *fence = file->private_data; 601 unsigned long flags; 602 603 /* 604 * We need to remove all ways to access this fence before droping 605 * our ref. 606 * 607 * start with its membership in the global fence list 608 */ 609 spin_lock_irqsave(&sync_fence_list_lock, flags); 610 list_del(&fence->sync_fence_list); 611 spin_unlock_irqrestore(&sync_fence_list_lock, flags); 612 613 /* 614 * remove its pts from their parents so that sync_timeline_signal() 615 * can't reference the fence. 616 */ 617 sync_fence_detach_pts(fence); 618 619 kref_put(&fence->kref, sync_fence_free); 620 621 return 0; 622} 623 624static unsigned int sync_fence_poll(struct file *file, poll_table *wait) 625{ 626 struct sync_fence *fence = file->private_data; 627 628 poll_wait(file, &fence->wq, wait); 629 630 if (fence->status == 1) 631 return POLLIN; 632 else if (fence->status < 0) 633 return POLLERR; 634 else 635 return 0; 636} 637 638static long sync_fence_ioctl_wait(struct sync_fence *fence, unsigned long arg) 639{ 640 __s32 value; 641 642 if (copy_from_user(&value, (void __user *)arg, sizeof(value))) 643 return -EFAULT; 644 645 return sync_fence_wait(fence, value); 646} 647 648static long sync_fence_ioctl_merge(struct sync_fence *fence, unsigned long arg) 649{ 650 int fd = get_unused_fd(); 651 int err; 652 struct sync_fence *fence2, *fence3; 653 struct sync_merge_data data; 654 655 if (fd < 0) 656 return fd; 657 658 if (copy_from_user(&data, (void __user *)arg, sizeof(data))) { 659 err = -EFAULT; 660 goto err_put_fd; 661 } 662 663 fence2 = sync_fence_fdget(data.fd2); 664 if (fence2 == NULL) { 665 err = -ENOENT; 666 goto err_put_fd; 667 } 668 669 data.name[sizeof(data.name) - 1] = '\0'; 670 fence3 = sync_fence_merge(data.name, fence, fence2); 671 if (fence3 == NULL) { 672 err = -ENOMEM; 673 goto err_put_fence2; 674 } 675 676 data.fence = fd; 677 if (copy_to_user((void __user *)arg, &data, sizeof(data))) { 678 err = -EFAULT; 679 goto err_put_fence3; 680 } 681 682 sync_fence_install(fence3, fd); 683 sync_fence_put(fence2); 684 return 0; 685 686err_put_fence3: 687 sync_fence_put(fence3); 688 689err_put_fence2: 690 sync_fence_put(fence2); 691 692err_put_fd: 693 put_unused_fd(fd); 694 return err; 695} 696 697static int sync_fill_pt_info(struct sync_pt *pt, void *data, int size) 698{ 699 struct sync_pt_info *info = data; 700 int ret; 701 702 if (size < sizeof(struct sync_pt_info)) 703 return -ENOMEM; 704 705 info->len = sizeof(struct sync_pt_info); 706 707 if (pt->parent->ops->fill_driver_data) { 708 ret = pt->parent->ops->fill_driver_data(pt, info->driver_data, 709 size - sizeof(*info)); 710 if (ret < 0) 711 return ret; 712 713 info->len += ret; 714 } 715 716 strlcpy(info->obj_name, pt->parent->name, sizeof(info->obj_name)); 717 strlcpy(info->driver_name, pt->parent->ops->driver_name, 718 sizeof(info->driver_name)); 719 info->status = pt->status; 720 info->timestamp_ns = ktime_to_ns(pt->timestamp); 721 722 return info->len; 723} 724 725static long sync_fence_ioctl_fence_info(struct sync_fence *fence, 726 unsigned long arg) 727{ 728 struct sync_fence_info_data *data; 729 struct list_head *pos; 730 __u32 size; 731 __u32 len = 0; 732 int ret; 733 734 if (copy_from_user(&size, (void __user *)arg, sizeof(size))) 735 return -EFAULT; 736 737 if (size < sizeof(struct sync_fence_info_data)) 738 return -EINVAL; 739 740 if (size > 4096) 741 size = 4096; 742 743 data = kzalloc(size, GFP_KERNEL); 744 if (data == NULL) 745 return -ENOMEM; 746 747 strlcpy(data->name, fence->name, sizeof(data->name)); 748 data->status = fence->status; 749 len = sizeof(struct sync_fence_info_data); 750 751 list_for_each(pos, &fence->pt_list_head) { 752 struct sync_pt *pt = 753 container_of(pos, struct sync_pt, pt_list); 754 755 ret = sync_fill_pt_info(pt, (u8 *)data + len, size - len); 756 757 if (ret < 0) 758 goto out; 759 760 len += ret; 761 } 762 763 data->len = len; 764 765 if (copy_to_user((void __user *)arg, data, len)) 766 ret = -EFAULT; 767 else 768 ret = 0; 769 770out: 771 kfree(data); 772 773 return ret; 774} 775 776static long sync_fence_ioctl(struct file *file, unsigned int cmd, 777 unsigned long arg) 778{ 779 struct sync_fence *fence = file->private_data; 780 switch (cmd) { 781 case SYNC_IOC_WAIT: 782 return sync_fence_ioctl_wait(fence, arg); 783 784 case SYNC_IOC_MERGE: 785 return sync_fence_ioctl_merge(fence, arg); 786 787 case SYNC_IOC_FENCE_INFO: 788 return sync_fence_ioctl_fence_info(fence, arg); 789 790 default: 791 return -ENOTTY; 792 } 793} 794 795#ifdef CONFIG_DEBUG_FS 796static const char *sync_status_str(int status) 797{ 798 if (status > 0) 799 return "signaled"; 800 else if (status == 0) 801 return "active"; 802 else 803 return "error"; 804} 805 806static void sync_print_pt(struct seq_file *s, struct sync_pt *pt, bool fence) 807{ 808 int status = pt->status; 809 seq_printf(s, " %s%spt %s", 810 fence ? pt->parent->name : "", 811 fence ? "_" : "", 812 sync_status_str(status)); 813 if (pt->status) { 814 struct timeval tv = ktime_to_timeval(pt->timestamp); 815 seq_printf(s, "@%ld.%06ld", tv.tv_sec, tv.tv_usec); 816 } 817 818 if (pt->parent->ops->print_pt) { 819 seq_printf(s, ": "); 820 pt->parent->ops->print_pt(s, pt); 821 } 822 823 seq_printf(s, "\n"); 824} 825 826static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj) 827{ 828 struct list_head *pos; 829 unsigned long flags; 830 831 seq_printf(s, "%s %s", obj->name, obj->ops->driver_name); 832 833 if (obj->ops->print_obj) { 834 seq_printf(s, ": "); 835 obj->ops->print_obj(s, obj); 836 } 837 838 seq_printf(s, "\n"); 839 840 spin_lock_irqsave(&obj->child_list_lock, flags); 841 list_for_each(pos, &obj->child_list_head) { 842 struct sync_pt *pt = 843 container_of(pos, struct sync_pt, child_list); 844 sync_print_pt(s, pt, false); 845 } 846 spin_unlock_irqrestore(&obj->child_list_lock, flags); 847} 848 849static void sync_print_fence(struct seq_file *s, struct sync_fence *fence) 850{ 851 struct list_head *pos; 852 unsigned long flags; 853 854 seq_printf(s, "[%p] %s: %s\n", fence, fence->name, 855 sync_status_str(fence->status)); 856 857 list_for_each(pos, &fence->pt_list_head) { 858 struct sync_pt *pt = 859 container_of(pos, struct sync_pt, pt_list); 860 sync_print_pt(s, pt, true); 861 } 862 863 spin_lock_irqsave(&fence->waiter_list_lock, flags); 864 list_for_each(pos, &fence->waiter_list_head) { 865 struct sync_fence_waiter *waiter = 866 container_of(pos, struct sync_fence_waiter, 867 waiter_list); 868 869 seq_printf(s, "waiter %pF\n", waiter->callback); 870 } 871 spin_unlock_irqrestore(&fence->waiter_list_lock, flags); 872} 873 874static int sync_debugfs_show(struct seq_file *s, void *unused) 875{ 876 unsigned long flags; 877 struct list_head *pos; 878 879 seq_printf(s, "objs:\n--------------\n"); 880 881 spin_lock_irqsave(&sync_timeline_list_lock, flags); 882 list_for_each(pos, &sync_timeline_list_head) { 883 struct sync_timeline *obj = 884 container_of(pos, struct sync_timeline, 885 sync_timeline_list); 886 887 sync_print_obj(s, obj); 888 seq_printf(s, "\n"); 889 } 890 spin_unlock_irqrestore(&sync_timeline_list_lock, flags); 891 892 seq_printf(s, "fences:\n--------------\n"); 893 894 spin_lock_irqsave(&sync_fence_list_lock, flags); 895 list_for_each(pos, &sync_fence_list_head) { 896 struct sync_fence *fence = 897 container_of(pos, struct sync_fence, sync_fence_list); 898 899 sync_print_fence(s, fence); 900 seq_printf(s, "\n"); 901 } 902 spin_unlock_irqrestore(&sync_fence_list_lock, flags); 903 return 0; 904} 905 906static int sync_debugfs_open(struct inode *inode, struct file *file) 907{ 908 return single_open(file, sync_debugfs_show, inode->i_private); 909} 910 911static const struct file_operations sync_debugfs_fops = { 912 .open = sync_debugfs_open, 913 .read = seq_read, 914 .llseek = seq_lseek, 915 .release = single_release, 916}; 917 918static __init int sync_debugfs_init(void) 919{ 920 debugfs_create_file("sync", S_IRUGO, NULL, NULL, &sync_debugfs_fops); 921 return 0; 922} 923late_initcall(sync_debugfs_init); 924 925#define DUMP_CHUNK 256 926static char sync_dump_buf[64 * 1024]; 927void sync_dump(void) 928{ 929 struct seq_file s = { 930 .buf = sync_dump_buf, 931 .size = sizeof(sync_dump_buf) - 1, 932 }; 933 int i; 934 935 sync_debugfs_show(&s, NULL); 936 937 for (i = 0; i < s.count; i += DUMP_CHUNK) { 938 if ((s.count - i) > DUMP_CHUNK) { 939 char c = s.buf[i + DUMP_CHUNK]; 940 s.buf[i + DUMP_CHUNK] = 0; 941 pr_cont("%s", s.buf + i); 942 s.buf[i + DUMP_CHUNK] = c; 943 } else { 944 s.buf[s.count] = 0; 945 pr_cont("%s", s.buf + i); 946 } 947 } 948} 949#else 950static void sync_dump(void) 951{ 952} 953#endif 954