drivers/gpu/drm/vmwgfx/vmwgfx_fence.c

   1 /**************************************************************************
   2  *
   3  * Copyright © 2011 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include <drm/drmP.h>
  29 #include "vmwgfx_drv.h"
  30
  31 #define VMW_FENCE_WRAP (1 << 31)
  32
  33 struct vmw_fence_manager {
  34         int num_fence_objects;
  35         struct vmw_private *dev_priv;
  36         spinlock_t lock;
  37         struct list_head fence_list;
  38         struct work_struct work, ping_work;
  39         u32 user_fence_size;
  40         u32 fence_size;
  41         u32 event_fence_action_size;
  42         bool fifo_down;
  43         struct list_head cleanup_list;
  44         uint32_t pending_actions[VMW_ACTION_MAX];
  45         struct mutex goal_irq_mutex;
  46         bool goal_irq_on; /* Protected by @goal_irq_mutex */
  47         bool seqno_valid; /* Protected by @lock, and may not be set to true
  48                              without the @goal_irq_mutex held. */
  49         unsigned ctx;
  50 };
  51
  52 struct vmw_user_fence {
  53         struct ttm_base_object base;
  54         struct vmw_fence_obj fence;
  55 };
  56
  57 /**
  58  * struct vmw_event_fence_action - fence action that delivers a drm event.
  59  *
  60  * @e: A struct drm_pending_event that controls the event delivery.
  61  * @action: A struct vmw_fence_action to hook up to a fence.
  62  * @fence: A referenced pointer to the fence to keep it alive while @action
  63  * hangs on it.
  64  * @dev: Pointer to a struct drm_device so we can access the event stuff.
  65  * @kref: Both @e and @action has destructors, so we need to refcount.
  66  * @size: Size accounted for this object.
  67  * @tv_sec: If non-null, the variable pointed to will be assigned
  68  * current time tv_sec val when the fence signals.
  69  * @tv_usec: Must be set if @tv_sec is set, and the variable pointed to will
  70  * be assigned the current time tv_usec val when the fence signals.
  71  */
  72 struct vmw_event_fence_action {
  73         struct vmw_fence_action action;
  74         struct list_head fpriv_head;
  75
  76         struct drm_pending_event *event;
  77         struct vmw_fence_obj *fence;
  78         struct drm_device *dev;
  79
  80         uint32_t *tv_sec;
  81         uint32_t *tv_usec;
  82 };
  83
  84 static struct vmw_fence_manager *
  85 fman_from_fence(struct vmw_fence_obj *fence)
  86 {
  87         return container_of(fence->base.lock, struct vmw_fence_manager, lock);
  88 }
  89
  90 /**
  91  * Note on fencing subsystem usage of irqs:
  92  * Typically the vmw_fences_update function is called
  93  *
  94  * a) When a new fence seqno has been submitted by the fifo code.
  95  * b) On-demand when we have waiters. Sleeping waiters will switch on the
  96  * ANY_FENCE irq and call vmw_fences_update function each time an ANY_FENCE
  97  * irq is received. When the last fence waiter is gone, that IRQ is masked
  98  * away.
  99  *
 100  * In situations where there are no waiters and we don't submit any new fences,
 101  * fence objects may not be signaled. This is perfectly OK, since there are
 102  * no consumers of the signaled data, but that is NOT ok when there are fence
 103  * actions attached to a fence. The fencing subsystem then makes use of the
 104  * FENCE_GOAL irq and sets the fence goal seqno to that of the next fence
 105  * which has an action attached, and each time vmw_fences_update is called,
 106  * the subsystem makes sure the fence goal seqno is updated.
 107  *
 108  * The fence goal seqno irq is on as long as there are unsignaled fence
 109  * objects with actions attached to them.
 110  */
 111
 112 static void vmw_fence_obj_destroy(struct fence *f)
 113 {
 114         struct vmw_fence_obj *fence =
 115                 container_of(f, struct vmw_fence_obj, base);
 116
 117         struct vmw_fence_manager *fman = fman_from_fence(fence);
 118         unsigned long irq_flags;
 119
 120         spin_lock_irqsave(&fman->lock, irq_flags);
 121         list_del_init(&fence->head);
 122         --fman->num_fence_objects;
 123         spin_unlock_irqrestore(&fman->lock, irq_flags);
 124         fence->destroy(fence);
 125 }
 126
 127 static const char *vmw_fence_get_driver_name(struct fence *f)
 128 {
 129         return "vmwgfx";
 130 }
 131
 132 static const char *vmw_fence_get_timeline_name(struct fence *f)
 133 {
 134         return "svga";
 135 }
 136
 137 static void vmw_fence_ping_func(struct work_struct *work)
 138 {
 139         struct vmw_fence_manager *fman =
 140                 container_of(work, struct vmw_fence_manager, ping_work);
 141
 142         vmw_fifo_ping_host(fman->dev_priv, SVGA_SYNC_GENERIC);
 143 }
 144
 145 static bool vmw_fence_enable_signaling(struct fence *f)
 146 {
 147         struct vmw_fence_obj *fence =
 148                 container_of(f, struct vmw_fence_obj, base);
 149
 150         struct vmw_fence_manager *fman = fman_from_fence(fence);
 151         struct vmw_private *dev_priv = fman->dev_priv;
 152
 153         __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
 154         u32 seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE);
 155         if (seqno - fence->base.seqno < VMW_FENCE_WRAP)
 156                 return false;
 157
 158         if (mutex_trylock(&dev_priv->hw_mutex)) {
 159                 vmw_fifo_ping_host_locked(dev_priv, SVGA_SYNC_GENERIC);
 160                 mutex_unlock(&dev_priv->hw_mutex);
 161         } else
 162                 schedule_work(&fman->ping_work);
 163
 164         return true;
 165 }
 166
 167 struct vmwgfx_wait_cb {
 168         struct fence_cb base;
 169         struct task_struct *task;
 170 };
 171
 172 static void
 173 vmwgfx_wait_cb(struct fence *fence, struct fence_cb *cb)
 174 {
 175         struct vmwgfx_wait_cb *wait =
 176                 container_of(cb, struct vmwgfx_wait_cb, base);
 177
 178         wake_up_process(wait->task);
 179 }
 180
 181 static void __vmw_fences_update(struct vmw_fence_manager *fman);
 182
 183 static long vmw_fence_wait(struct fence *f, bool intr, signed long timeout)
 184 {
 185         struct vmw_fence_obj *fence =
 186                 container_of(f, struct vmw_fence_obj, base);
 187
 188         struct vmw_fence_manager *fman = fman_from_fence(fence);
 189         struct vmw_private *dev_priv = fman->dev_priv;
 190         struct vmwgfx_wait_cb cb;
 191         long ret = timeout;
 192         unsigned long irq_flags;
 193
 194         if (likely(vmw_fence_obj_signaled(fence)))
 195                 return timeout;
 196
 197         vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
 198         vmw_seqno_waiter_add(dev_priv);
 199
 200         spin_lock_irqsave(f->lock, irq_flags);
 201
 202         if (intr && signal_pending(current)) {
 203                 ret = -ERESTARTSYS;
 204                 goto out;
 205         }
 206
 207         cb.base.func = vmwgfx_wait_cb;
 208         cb.task = current;
 209         list_add(&cb.base.node, &f->cb_list);
 210
 211         while (ret > 0) {
 212                 __vmw_fences_update(fman);
 213                 if (test_bit(FENCE_FLAG_SIGNALED_BIT, &f->flags))
 214                         break;
 215
 216                 if (intr)
 217                         __set_current_state(TASK_INTERRUPTIBLE);
 218                 else
 219                         __set_current_state(TASK_UNINTERRUPTIBLE);
 220                 spin_unlock_irqrestore(f->lock, irq_flags);
 221
 222                 ret = schedule_timeout(ret);
 223
 224                 spin_lock_irqsave(f->lock, irq_flags);
 225                 if (ret > 0 && intr && signal_pending(current))
 226                         ret = -ERESTARTSYS;
 227         }
 228
 229         if (!list_empty(&cb.base.node))
 230                 list_del(&cb.base.node);
 231         __set_current_state(TASK_RUNNING);
 232
 233 out:
 234         spin_unlock_irqrestore(f->lock, irq_flags);
 235
 236         vmw_seqno_waiter_remove(dev_priv);
 237
 238         return ret;
 239 }
 240
 241 static struct fence_ops vmw_fence_ops = {
 242         .get_driver_name = vmw_fence_get_driver_name,
 243         .get_timeline_name = vmw_fence_get_timeline_name,
 244         .enable_signaling = vmw_fence_enable_signaling,
 245         .wait = vmw_fence_wait,
 246         .release = vmw_fence_obj_destroy,
 247 };
 248
 249
 250 /**
 251  * Execute signal actions on fences recently signaled.
 252  * This is done from a workqueue so we don't have to execute
 253  * signal actions from atomic context.
 254  */
 255
 256 static void vmw_fence_work_func(struct work_struct *work)
 257 {
 258         struct vmw_fence_manager *fman =
 259                 container_of(work, struct vmw_fence_manager, work);
 260         struct list_head list;
 261         struct vmw_fence_action *action, *next_action;
 262         bool seqno_valid;
 263
 264         do {
 265                 INIT_LIST_HEAD(&list);
 266                 mutex_lock(&fman->goal_irq_mutex);
 267
 268                 spin_lock_irq(&fman->lock);
 269                 list_splice_init(&fman->cleanup_list, &list);
 270                 seqno_valid = fman->seqno_valid;
 271                 spin_unlock_irq(&fman->lock);
 272
 273                 if (!seqno_valid && fman->goal_irq_on) {
 274                         fman->goal_irq_on = false;
 275                         vmw_goal_waiter_remove(fman->dev_priv);
 276                 }
 277                 mutex_unlock(&fman->goal_irq_mutex);
 278
 279                 if (list_empty(&list))
 280                         return;
 281
 282                 /*
 283                  * At this point, only we should be able to manipulate the
 284                  * list heads of the actions we have on the private list.
 285                  * hence fman::lock not held.
 286                  */
 287
 288                 list_for_each_entry_safe(action, next_action, &list, head) {
 289                         list_del_init(&action->head);
 290                         if (action->cleanup)
 291                                 action->cleanup(action);
 292                 }
 293         } while (1);
 294 }
 295
 296 struct vmw_fence_manager *vmw_fence_manager_init(struct vmw_private *dev_priv)
 297 {
 298         struct vmw_fence_manager *fman = kzalloc(sizeof(*fman), GFP_KERNEL);
 299
 300         if (unlikely(fman == NULL))
 301                 return NULL;
 302
 303         fman->dev_priv = dev_priv;
 304         spin_lock_init(&fman->lock);
 305         INIT_LIST_HEAD(&fman->fence_list);
 306         INIT_LIST_HEAD(&fman->cleanup_list);
 307         INIT_WORK(&fman->work, &vmw_fence_work_func);
 308         INIT_WORK(&fman->ping_work, &vmw_fence_ping_func);
 309         fman->fifo_down = true;
 310         fman->user_fence_size = ttm_round_pot(sizeof(struct vmw_user_fence));
 311         fman->fence_size = ttm_round_pot(sizeof(struct vmw_fence_obj));
 312         fman->event_fence_action_size =
 313                 ttm_round_pot(sizeof(struct vmw_event_fence_action));
 314         mutex_init(&fman->goal_irq_mutex);
 315         fman->ctx = fence_context_alloc(1);
 316
 317         return fman;
 318 }
 319
 320 void vmw_fence_manager_takedown(struct vmw_fence_manager *fman)
 321 {
 322         unsigned long irq_flags;
 323         bool lists_empty;
 324
 325         (void) cancel_work_sync(&fman->work);
 326         (void) cancel_work_sync(&fman->ping_work);
 327
 328         spin_lock_irqsave(&fman->lock, irq_flags);
 329         lists_empty = list_empty(&fman->fence_list) &&
 330                 list_empty(&fman->cleanup_list);
 331         spin_unlock_irqrestore(&fman->lock, irq_flags);
 332
 333         BUG_ON(!lists_empty);
 334         kfree(fman);
 335 }
 336
 337 static int vmw_fence_obj_init(struct vmw_fence_manager *fman,
 338                               struct vmw_fence_obj *fence, u32 seqno,
 339                               void (*destroy) (struct vmw_fence_obj *fence))
 340 {
 341         unsigned long irq_flags;
 342         int ret = 0;
 343
 344         fence_init(&fence->base, &vmw_fence_ops, &fman->lock,
 345                    fman->ctx, seqno);
 346         INIT_LIST_HEAD(&fence->seq_passed_actions);
 347         fence->destroy = destroy;
 348
 349         spin_lock_irqsave(&fman->lock, irq_flags);
 350         if (unlikely(fman->fifo_down)) {
 351                 ret = -EBUSY;
 352                 goto out_unlock;
 353         }
 354         list_add_tail(&fence->head, &fman->fence_list);
 355         ++fman->num_fence_objects;
 356
 357 out_unlock:
 358         spin_unlock_irqrestore(&fman->lock, irq_flags);
 359         return ret;
 360
 361 }
 362
 363 static void vmw_fences_perform_actions(struct vmw_fence_manager *fman,
 364                                 struct list_head *list)
 365 {
 366         struct vmw_fence_action *action, *next_action;
 367
 368         list_for_each_entry_safe(action, next_action, list, head) {
 369                 list_del_init(&action->head);
 370                 fman->pending_actions[action->type]--;
 371                 if (action->seq_passed != NULL)
 372                         action->seq_passed(action);
 373
 374                 /*
 375                  * Add the cleanup action to the cleanup list so that
 376                  * it will be performed by a worker task.
 377                  */
 378
 379                 list_add_tail(&action->head, &fman->cleanup_list);
 380         }
 381 }
 382
 383 /**
 384  * vmw_fence_goal_new_locked - Figure out a new device fence goal
 385  * seqno if needed.
 386  *
 387  * @fman: Pointer to a fence manager.
 388  * @passed_seqno: The seqno the device currently signals as passed.
 389  *
 390  * This function should be called with the fence manager lock held.
 391  * It is typically called when we have a new passed_seqno, and
 392  * we might need to update the fence goal. It checks to see whether
 393  * the current fence goal has already passed, and, in that case,
 394  * scans through all unsignaled fences to get the next fence object with an
 395  * action attached, and sets the seqno of that fence as a new fence goal.
 396  *
 397  * returns true if the device goal seqno was updated. False otherwise.
 398  */
 399 static bool vmw_fence_goal_new_locked(struct vmw_fence_manager *fman,
 400                                       u32 passed_seqno)
 401 {
 402         u32 goal_seqno;
 403         __le32 __iomem *fifo_mem;
 404         struct vmw_fence_obj *fence;
 405
 406         if (likely(!fman->seqno_valid))
 407                 return false;
 408
 409         fifo_mem = fman->dev_priv->mmio_virt;
 410         goal_seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE_GOAL);
 411         if (likely(passed_seqno - goal_seqno >= VMW_FENCE_WRAP))
 412                 return false;
 413
 414         fman->seqno_valid = false;
 415         list_for_each_entry(fence, &fman->fence_list, head) {
 416                 if (!list_empty(&fence->seq_passed_actions)) {
 417                         fman->seqno_valid = true;
 418                         iowrite32(fence->base.seqno,
 419                                   fifo_mem + SVGA_FIFO_FENCE_GOAL);
 420                         break;
 421                 }
 422         }
 423
 424         return true;
 425 }
 426
 427
 428 /**
 429  * vmw_fence_goal_check_locked - Replace the device fence goal seqno if
 430  * needed.
 431  *
 432  * @fence: Pointer to a struct vmw_fence_obj the seqno of which should be
 433  * considered as a device fence goal.
 434  *
 435  * This function should be called with the fence manager lock held.
 436  * It is typically called when an action has been attached to a fence to
 437  * check whether the seqno of that fence should be used for a fence
 438  * goal interrupt. This is typically needed if the current fence goal is
 439  * invalid, or has a higher seqno than that of the current fence object.
 440  *
 441  * returns true if the device goal seqno was updated. False otherwise.
 442  */
 443 static bool vmw_fence_goal_check_locked(struct vmw_fence_obj *fence)
 444 {
 445         struct vmw_fence_manager *fman = fman_from_fence(fence);
 446         u32 goal_seqno;
 447         __le32 __iomem *fifo_mem;
 448
 449         if (fence_is_signaled_locked(&fence->base))
 450                 return false;
 451
 452         fifo_mem = fman->dev_priv->mmio_virt;
 453         goal_seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE_GOAL);
 454         if (likely(fman->seqno_valid &&
 455                    goal_seqno - fence->base.seqno < VMW_FENCE_WRAP))
 456                 return false;
 457
 458         iowrite32(fence->base.seqno, fifo_mem + SVGA_FIFO_FENCE_GOAL);
 459         fman->seqno_valid = true;
 460
 461         return true;
 462 }
 463
 464 static void __vmw_fences_update(struct vmw_fence_manager *fman)
 465 {
 466         struct vmw_fence_obj *fence, *next_fence;
 467         struct list_head action_list;
 468         bool needs_rerun;
 469         uint32_t seqno, new_seqno;
 470         __le32 __iomem *fifo_mem = fman->dev_priv->mmio_virt;
 471
 472         seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE);
 473 rerun:
 474         list_for_each_entry_safe(fence, next_fence, &fman->fence_list, head) {
 475                 if (seqno - fence->base.seqno < VMW_FENCE_WRAP) {
 476                         list_del_init(&fence->head);
 477                         fence_signal_locked(&fence->base);
 478                         INIT_LIST_HEAD(&action_list);
 479                         list_splice_init(&fence->seq_passed_actions,
 480                                          &action_list);
 481                         vmw_fences_perform_actions(fman, &action_list);
 482                 } else
 483                         break;
 484         }
 485
 486         /*
 487          * Rerun if the fence goal seqno was updated, and the
 488          * hardware might have raced with that update, so that
 489          * we missed a fence_goal irq.
 490          */
 491
 492         needs_rerun = vmw_fence_goal_new_locked(fman, seqno);
 493         if (unlikely(needs_rerun)) {
 494                 new_seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE);
 495                 if (new_seqno != seqno) {
 496                         seqno = new_seqno;
 497                         goto rerun;
 498                 }
 499         }
 500
 501         if (!list_empty(&fman->cleanup_list))
 502                 (void) schedule_work(&fman->work);
 503 }
 504
 505 void vmw_fences_update(struct vmw_fence_manager *fman)
 506 {
 507         unsigned long irq_flags;
 508
 509         spin_lock_irqsave(&fman->lock, irq_flags);
 510         __vmw_fences_update(fman);
 511         spin_unlock_irqrestore(&fman->lock, irq_flags);
 512 }
 513
 514 bool vmw_fence_obj_signaled(struct vmw_fence_obj *fence)
 515 {
 516         struct vmw_fence_manager *fman = fman_from_fence(fence);
 517
 518         if (test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))
 519                 return 1;
 520
 521         vmw_fences_update(fman);
 522
 523         return fence_is_signaled(&fence->base);
 524 }
 525
 526 int vmw_fence_obj_wait(struct vmw_fence_obj *fence, bool lazy,
 527                        bool interruptible, unsigned long timeout)
 528 {
 529         long ret = fence_wait_timeout(&fence->base, interruptible, timeout);
 530
 531         if (likely(ret > 0))
 532                 return 0;
 533         else if (ret == 0)
 534                 return -EBUSY;
 535         else
 536                 return ret;
 537 }
 538
 539 void vmw_fence_obj_flush(struct vmw_fence_obj *fence)
 540 {
 541         struct vmw_private *dev_priv = fman_from_fence(fence)->dev_priv;
 542
 543         vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
 544 }
 545
 546 static void vmw_fence_destroy(struct vmw_fence_obj *fence)
 547 {
 548         struct vmw_fence_manager *fman = fman_from_fence(fence);
 549
 550         fence_free(&fence->base);
 551
 552         /*
 553          * Free kernel space accounting.
 554          */
 555         ttm_mem_global_free(vmw_mem_glob(fman->dev_priv),
 556                             fman->fence_size);
 557 }
 558
 559 int vmw_fence_create(struct vmw_fence_manager *fman,
 560                      uint32_t seqno,
 561                      struct vmw_fence_obj **p_fence)
 562 {
 563         struct ttm_mem_global *mem_glob = vmw_mem_glob(fman->dev_priv);
 564         struct vmw_fence_obj *fence;
 565         int ret;
 566
 567         ret = ttm_mem_global_alloc(mem_glob, fman->fence_size,
 568                                    false, false);
 569         if (unlikely(ret != 0))
 570                 return ret;
 571
 572         fence = kzalloc(sizeof(*fence), GFP_KERNEL);
 573         if (unlikely(fence == NULL)) {
 574                 ret = -ENOMEM;
 575                 goto out_no_object;
 576         }
 577
 578         ret = vmw_fence_obj_init(fman, fence, seqno,
 579                                  vmw_fence_destroy);
 580         if (unlikely(ret != 0))
 581                 goto out_err_init;
 582
 583         *p_fence = fence;
 584         return 0;
 585
 586 out_err_init:
 587         kfree(fence);
 588 out_no_object:
 589         ttm_mem_global_free(mem_glob, fman->fence_size);
 590         return ret;
 591 }
 592
 593
 594 static void vmw_user_fence_destroy(struct vmw_fence_obj *fence)
 595 {
 596         struct vmw_user_fence *ufence =
 597                 container_of(fence, struct vmw_user_fence, fence);
 598         struct vmw_fence_manager *fman = fman_from_fence(fence);
 599
 600         ttm_base_object_kfree(ufence, base);
 601         /*
 602          * Free kernel space accounting.
 603          */
 604         ttm_mem_global_free(vmw_mem_glob(fman->dev_priv),
 605                             fman->user_fence_size);
 606 }
 607
 608 static void vmw_user_fence_base_release(struct ttm_base_object **p_base)
 609 {
 610         struct ttm_base_object *base = *p_base;
 611         struct vmw_user_fence *ufence =
 612                 container_of(base, struct vmw_user_fence, base);
 613         struct vmw_fence_obj *fence = &ufence->fence;
 614
 615         *p_base = NULL;
 616         vmw_fence_obj_unreference(&fence);
 617 }
 618
 619 int vmw_user_fence_create(struct drm_file *file_priv,
 620                           struct vmw_fence_manager *fman,
 621                           uint32_t seqno,
 622                           struct vmw_fence_obj **p_fence,
 623                           uint32_t *p_handle)
 624 {
 625         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 626         struct vmw_user_fence *ufence;
 627         struct vmw_fence_obj *tmp;
 628         struct ttm_mem_global *mem_glob = vmw_mem_glob(fman->dev_priv);
 629         int ret;
 630
 631         /*
 632          * Kernel memory space accounting, since this object may
 633          * be created by a user-space request.
 634          */
 635
 636         ret = ttm_mem_global_alloc(mem_glob, fman->user_fence_size,
 637                                    false, false);
 638         if (unlikely(ret != 0))
 639                 return ret;
 640
 641         ufence = kzalloc(sizeof(*ufence), GFP_KERNEL);
 642         if (unlikely(ufence == NULL)) {
 643                 ret = -ENOMEM;
 644                 goto out_no_object;
 645         }
 646
 647         ret = vmw_fence_obj_init(fman, &ufence->fence, seqno,
 648                                  vmw_user_fence_destroy);
 649         if (unlikely(ret != 0)) {
 650                 kfree(ufence);
 651                 goto out_no_object;
 652         }
 653
 654         /*
 655          * The base object holds a reference which is freed in
 656          * vmw_user_fence_base_release.
 657          */
 658         tmp = vmw_fence_obj_reference(&ufence->fence);
 659         ret = ttm_base_object_init(tfile, &ufence->base, false,
 660                                    VMW_RES_FENCE,
 661                                    &vmw_user_fence_base_release, NULL);
 662
 663
 664         if (unlikely(ret != 0)) {
 665                 /*
 666                  * Free the base object's reference
 667                  */
 668                 vmw_fence_obj_unreference(&tmp);
 669                 goto out_err;
 670         }
 671
 672         *p_fence = &ufence->fence;
 673         *p_handle = ufence->base.hash.key;
 674
 675         return 0;
 676 out_err:
 677         tmp = &ufence->fence;
 678         vmw_fence_obj_unreference(&tmp);
 679 out_no_object:
 680         ttm_mem_global_free(mem_glob, fman->user_fence_size);
 681         return ret;
 682 }
 683
 684
 685 /**
 686  * vmw_fence_fifo_down - signal all unsignaled fence objects.
 687  */
 688
 689 void vmw_fence_fifo_down(struct vmw_fence_manager *fman)
 690 {
 691         struct list_head action_list;
 692         int ret;
 693
 694         /*
 695          * The list may be altered while we traverse it, so always
 696          * restart when we've released the fman->lock.
 697          */
 698
 699         spin_lock_irq(&fman->lock);
 700         fman->fifo_down = true;
 701         while (!list_empty(&fman->fence_list)) {
 702                 struct vmw_fence_obj *fence =
 703                         list_entry(fman->fence_list.prev, struct vmw_fence_obj,
 704                                    head);
 705                 fence_get(&fence->base);
 706                 spin_unlock_irq(&fman->lock);
 707
 708                 ret = vmw_fence_obj_wait(fence, false, false,
 709                                          VMW_FENCE_WAIT_TIMEOUT);
 710
 711                 if (unlikely(ret != 0)) {
 712                         list_del_init(&fence->head);
 713                         fence_signal(&fence->base);
 714                         INIT_LIST_HEAD(&action_list);
 715                         list_splice_init(&fence->seq_passed_actions,
 716                                          &action_list);
 717                         vmw_fences_perform_actions(fman, &action_list);
 718                 }
 719
 720                 BUG_ON(!list_empty(&fence->head));
 721                 fence_put(&fence->base);
 722                 spin_lock_irq(&fman->lock);
 723         }
 724         spin_unlock_irq(&fman->lock);
 725 }
 726
 727 void vmw_fence_fifo_up(struct vmw_fence_manager *fman)
 728 {
 729         unsigned long irq_flags;
 730
 731         spin_lock_irqsave(&fman->lock, irq_flags);
 732         fman->fifo_down = false;
 733         spin_unlock_irqrestore(&fman->lock, irq_flags);
 734 }
 735
 736
 737 int vmw_fence_obj_wait_ioctl(struct drm_device *dev, void *data,
 738                              struct drm_file *file_priv)
 739 {
 740         struct drm_vmw_fence_wait_arg *arg =
 741             (struct drm_vmw_fence_wait_arg *)data;
 742         unsigned long timeout;
 743         struct ttm_base_object *base;
 744         struct vmw_fence_obj *fence;
 745         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 746         int ret;
 747         uint64_t wait_timeout = ((uint64_t)arg->timeout_us * HZ);
 748
 749         /*
 750          * 64-bit division not present on 32-bit systems, so do an
 751          * approximation. (Divide by 1000000).
 752          */
 753
 754         wait_timeout = (wait_timeout >> 20) + (wait_timeout >> 24) -
 755           (wait_timeout >> 26);
 756
 757         if (!arg->cookie_valid) {
 758                 arg->cookie_valid = 1;
 759                 arg->kernel_cookie = jiffies + wait_timeout;
 760         }
 761
 762         base = ttm_base_object_lookup(tfile, arg->handle);
 763         if (unlikely(base == NULL)) {
 764                 printk(KERN_ERR "Wait invalid fence object handle "
 765                        "0x%08lx.\n",
 766                        (unsigned long)arg->handle);
 767                 return -EINVAL;
 768         }
 769
 770         fence = &(container_of(base, struct vmw_user_fence, base)->fence);
 771
 772         timeout = jiffies;
 773         if (time_after_eq(timeout, (unsigned long)arg->kernel_cookie)) {
 774                 ret = ((vmw_fence_obj_signaled(fence)) ?
 775                        0 : -EBUSY);
 776                 goto out;
 777         }
 778
 779         timeout = (unsigned long)arg->kernel_cookie - timeout;
 780
 781         ret = vmw_fence_obj_wait(fence, arg->lazy, true, timeout);
 782
 783 out:
 784         ttm_base_object_unref(&base);
 785
 786         /*
 787          * Optionally unref the fence object.
 788          */
 789
 790         if (ret == 0 && (arg->wait_options & DRM_VMW_WAIT_OPTION_UNREF))
 791                 return ttm_ref_object_base_unref(tfile, arg->handle,
 792                                                  TTM_REF_USAGE);
 793         return ret;
 794 }
 795
 796 int vmw_fence_obj_signaled_ioctl(struct drm_device *dev, void *data,
 797                                  struct drm_file *file_priv)
 798 {
 799         struct drm_vmw_fence_signaled_arg *arg =
 800                 (struct drm_vmw_fence_signaled_arg *) data;
 801         struct ttm_base_object *base;
 802         struct vmw_fence_obj *fence;
 803         struct vmw_fence_manager *fman;
 804         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 805         struct vmw_private *dev_priv = vmw_priv(dev);
 806
 807         base = ttm_base_object_lookup(tfile, arg->handle);
 808         if (unlikely(base == NULL)) {
 809                 printk(KERN_ERR "Fence signaled invalid fence object handle "
 810                        "0x%08lx.\n",
 811                        (unsigned long)arg->handle);
 812                 return -EINVAL;
 813         }
 814
 815         fence = &(container_of(base, struct vmw_user_fence, base)->fence);
 816         fman = fman_from_fence(fence);
 817
 818         arg->signaled = vmw_fence_obj_signaled(fence);
 819
 820         arg->signaled_flags = arg->flags;
 821         spin_lock_irq(&fman->lock);
 822         arg->passed_seqno = dev_priv->last_read_seqno;
 823         spin_unlock_irq(&fman->lock);
 824
 825         ttm_base_object_unref(&base);
 826
 827         return 0;
 828 }
 829
 830
 831 int vmw_fence_obj_unref_ioctl(struct drm_device *dev, void *data,
 832                               struct drm_file *file_priv)
 833 {
 834         struct drm_vmw_fence_arg *arg =
 835                 (struct drm_vmw_fence_arg *) data;
 836
 837         return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
 838                                          arg->handle,
 839                                          TTM_REF_USAGE);
 840 }
 841
 842 /**
 843  * vmw_event_fence_fpriv_gone - Remove references to struct drm_file objects
 844  *
 845  * @fman: Pointer to a struct vmw_fence_manager
 846  * @event_list: Pointer to linked list of struct vmw_event_fence_action objects
 847  * with pointers to a struct drm_file object about to be closed.
 848  *
 849  * This function removes all pending fence events with references to a
 850  * specific struct drm_file object about to be closed. The caller is required
 851  * to pass a list of all struct vmw_event_fence_action objects with such
 852  * events attached. This function is typically called before the
 853  * struct drm_file object's event management is taken down.
 854  */
 855 void vmw_event_fence_fpriv_gone(struct vmw_fence_manager *fman,
 856                                 struct list_head *event_list)
 857 {
 858         struct vmw_event_fence_action *eaction;
 859         struct drm_pending_event *event;
 860         unsigned long irq_flags;
 861
 862         while (1) {
 863                 spin_lock_irqsave(&fman->lock, irq_flags);
 864                 if (list_empty(event_list))
 865                         goto out_unlock;
 866                 eaction = list_first_entry(event_list,
 867                                            struct vmw_event_fence_action,
 868                                            fpriv_head);
 869                 list_del_init(&eaction->fpriv_head);
 870                 event = eaction->event;
 871                 eaction->event = NULL;
 872                 spin_unlock_irqrestore(&fman->lock, irq_flags);
 873                 event->destroy(event);
 874         }
 875 out_unlock:
 876         spin_unlock_irqrestore(&fman->lock, irq_flags);
 877 }
 878
 879
 880 /**
 881  * vmw_event_fence_action_seq_passed
 882  *
 883  * @action: The struct vmw_fence_action embedded in a struct
 884  * vmw_event_fence_action.
 885  *
 886  * This function is called when the seqno of the fence where @action is
 887  * attached has passed. It queues the event on the submitter's event list.
 888  * This function is always called from atomic context, and may be called
 889  * from irq context.
 890  */
 891 static void vmw_event_fence_action_seq_passed(struct vmw_fence_action *action)
 892 {
 893         struct vmw_event_fence_action *eaction =
 894                 container_of(action, struct vmw_event_fence_action, action);
 895         struct drm_device *dev = eaction->dev;
 896         struct drm_pending_event *event = eaction->event;
 897         struct drm_file *file_priv;
 898         unsigned long irq_flags;
 899
 900         if (unlikely(event == NULL))
 901                 return;
 902
 903         file_priv = event->file_priv;
 904         spin_lock_irqsave(&dev->event_lock, irq_flags);
 905
 906         if (likely(eaction->tv_sec != NULL)) {
 907                 struct timeval tv;
 908
 909                 do_gettimeofday(&tv);
 910                 *eaction->tv_sec = tv.tv_sec;
 911                 *eaction->tv_usec = tv.tv_usec;
 912         }
 913
 914         list_del_init(&eaction->fpriv_head);
 915         list_add_tail(&eaction->event->link, &file_priv->event_list);
 916         eaction->event = NULL;
 917         wake_up_all(&file_priv->event_wait);
 918         spin_unlock_irqrestore(&dev->event_lock, irq_flags);
 919 }
 920
 921 /**
 922  * vmw_event_fence_action_cleanup
 923  *
 924  * @action: The struct vmw_fence_action embedded in a struct
 925  * vmw_event_fence_action.
 926  *
 927  * This function is the struct vmw_fence_action destructor. It's typically
 928  * called from a workqueue.
 929  */
 930 static void vmw_event_fence_action_cleanup(struct vmw_fence_action *action)
 931 {
 932         struct vmw_event_fence_action *eaction =
 933                 container_of(action, struct vmw_event_fence_action, action);
 934         struct vmw_fence_manager *fman = fman_from_fence(eaction->fence);
 935         unsigned long irq_flags;
 936
 937         spin_lock_irqsave(&fman->lock, irq_flags);
 938         list_del(&eaction->fpriv_head);
 939         spin_unlock_irqrestore(&fman->lock, irq_flags);
 940
 941         vmw_fence_obj_unreference(&eaction->fence);
 942         kfree(eaction);
 943 }
 944
 945
 946 /**
 947  * vmw_fence_obj_add_action - Add an action to a fence object.
 948  *
 949  * @fence - The fence object.
 950  * @action - The action to add.
 951  *
 952  * Note that the action callbacks may be executed before this function
 953  * returns.
 954  */
 955 static void vmw_fence_obj_add_action(struct vmw_fence_obj *fence,
 956                               struct vmw_fence_action *action)
 957 {
 958         struct vmw_fence_manager *fman = fman_from_fence(fence);
 959         unsigned long irq_flags;
 960         bool run_update = false;
 961
 962         mutex_lock(&fman->goal_irq_mutex);
 963         spin_lock_irqsave(&fman->lock, irq_flags);
 964
 965         fman->pending_actions[action->type]++;
 966         if (fence_is_signaled_locked(&fence->base)) {
 967                 struct list_head action_list;
 968
 969                 INIT_LIST_HEAD(&action_list);
 970                 list_add_tail(&action->head, &action_list);
 971                 vmw_fences_perform_actions(fman, &action_list);
 972         } else {
 973                 list_add_tail(&action->head, &fence->seq_passed_actions);
 974
 975                 /*
 976                  * This function may set fman::seqno_valid, so it must
 977                  * be run with the goal_irq_mutex held.
 978                  */
 979                 run_update = vmw_fence_goal_check_locked(fence);
 980         }
 981
 982         spin_unlock_irqrestore(&fman->lock, irq_flags);
 983
 984         if (run_update) {
 985                 if (!fman->goal_irq_on) {
 986                         fman->goal_irq_on = true;
 987                         vmw_goal_waiter_add(fman->dev_priv);
 988                 }
 989                 vmw_fences_update(fman);
 990         }
 991         mutex_unlock(&fman->goal_irq_mutex);
 992
 993 }
 994
 995 /**
 996  * vmw_event_fence_action_create - Post an event for sending when a fence
 997  * object seqno has passed.
 998  *
 999  * @file_priv: The file connection on which the event should be posted.
1000  * @fence: The fence object on which to post the event.
1001  * @event: Event to be posted. This event should've been alloced
1002  * using k[mz]alloc, and should've been completely initialized.
1003  * @interruptible: Interruptible waits if possible.
1004  *
1005  * As a side effect, the object pointed to by @event may have been
1006  * freed when this function returns. If this function returns with
1007  * an error code, the caller needs to free that object.
1008  */
1009
1010 int vmw_event_fence_action_queue(struct drm_file *file_priv,
1011                                  struct vmw_fence_obj *fence,
1012                                  struct drm_pending_event *event,
1013                                  uint32_t *tv_sec,
1014                                  uint32_t *tv_usec,
1015                                  bool interruptible)
1016 {
1017         struct vmw_event_fence_action *eaction;
1018         struct vmw_fence_manager *fman = fman_from_fence(fence);
1019         struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);
1020         unsigned long irq_flags;
1021
1022         eaction = kzalloc(sizeof(*eaction), GFP_KERNEL);
1023         if (unlikely(eaction == NULL))
1024                 return -ENOMEM;
1025
1026         eaction->event = event;
1027
1028         eaction->action.seq_passed = vmw_event_fence_action_seq_passed;
1029         eaction->action.cleanup = vmw_event_fence_action_cleanup;
1030         eaction->action.type = VMW_ACTION_EVENT;
1031
1032         eaction->fence = vmw_fence_obj_reference(fence);
1033         eaction->dev = fman->dev_priv->dev;
1034         eaction->tv_sec = tv_sec;
1035         eaction->tv_usec = tv_usec;
1036
1037         spin_lock_irqsave(&fman->lock, irq_flags);
1038         list_add_tail(&eaction->fpriv_head, &vmw_fp->fence_events);
1039         spin_unlock_irqrestore(&fman->lock, irq_flags);
1040
1041         vmw_fence_obj_add_action(fence, &eaction->action);
1042
1043         return 0;
1044 }
1045
1046 struct vmw_event_fence_pending {
1047         struct drm_pending_event base;
1048         struct drm_vmw_event_fence event;
1049 };
1050
1051 static int vmw_event_fence_action_create(struct drm_file *file_priv,
1052                                   struct vmw_fence_obj *fence,
1053                                   uint32_t flags,
1054                                   uint64_t user_data,
1055                                   bool interruptible)
1056 {
1057         struct vmw_event_fence_pending *event;
1058         struct vmw_fence_manager *fman = fman_from_fence(fence);
1059         struct drm_device *dev = fman->dev_priv->dev;
1060         unsigned long irq_flags;
1061         int ret;
1062
1063         spin_lock_irqsave(&dev->event_lock, irq_flags);
1064
1065         ret = (file_priv->event_space < sizeof(event->event)) ? -EBUSY : 0;
1066         if (likely(ret == 0))
1067                 file_priv->event_space -= sizeof(event->event);
1068
1069         spin_unlock_irqrestore(&dev->event_lock, irq_flags);
1070
1071         if (unlikely(ret != 0)) {
1072                 DRM_ERROR("Failed to allocate event space for this file.\n");
1073                 goto out_no_space;
1074         }
1075
1076
1077         event = kzalloc(sizeof(*event), GFP_KERNEL);
1078         if (unlikely(event == NULL)) {
1079                 DRM_ERROR("Failed to allocate an event.\n");
1080                 ret = -ENOMEM;
1081                 goto out_no_event;
1082         }
1083
1084         event->event.base.type = DRM_VMW_EVENT_FENCE_SIGNALED;
1085         event->event.base.length = sizeof(*event);
1086         event->event.user_data = user_data;
1087
1088         event->base.event = &event->event.base;
1089         event->base.file_priv = file_priv;
1090         event->base.destroy = (void (*) (struct drm_pending_event *)) kfree;
1091
1092
1093         if (flags & DRM_VMW_FE_FLAG_REQ_TIME)
1094                 ret = vmw_event_fence_action_queue(file_priv, fence,
1095                                                    &event->base,
1096                                                    &event->event.tv_sec,
1097                                                    &event->event.tv_usec,
1098                                                    interruptible);
1099         else
1100                 ret = vmw_event_fence_action_queue(file_priv, fence,
1101                                                    &event->base,
1102                                                    NULL,
1103                                                    NULL,
1104                                                    interruptible);
1105         if (ret != 0)
1106                 goto out_no_queue;
1107
1108 out_no_queue:
1109         event->base.destroy(&event->base);
1110 out_no_event:
1111         spin_lock_irqsave(&dev->event_lock, irq_flags);
1112         file_priv->event_space += sizeof(*event);
1113         spin_unlock_irqrestore(&dev->event_lock, irq_flags);
1114 out_no_space:
1115         return ret;
1116 }
1117
1118 int vmw_fence_event_ioctl(struct drm_device *dev, void *data,
1119                           struct drm_file *file_priv)
1120 {
1121         struct vmw_private *dev_priv = vmw_priv(dev);
1122         struct drm_vmw_fence_event_arg *arg =
1123                 (struct drm_vmw_fence_event_arg *) data;
1124         struct vmw_fence_obj *fence = NULL;
1125         struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);
1126         struct drm_vmw_fence_rep __user *user_fence_rep =
1127                 (struct drm_vmw_fence_rep __user *)(unsigned long)
1128                 arg->fence_rep;
1129         uint32_t handle;
1130         int ret;
1131
1132         /*
1133          * Look up an existing fence object,
1134          * and if user-space wants a new reference,
1135          * add one.
1136          */
1137         if (arg->handle) {
1138                 struct ttm_base_object *base =
1139                         ttm_base_object_lookup_for_ref(dev_priv->tdev,
1140                                                        arg->handle);
1141
1142                 if (unlikely(base == NULL)) {
1143                         DRM_ERROR("Fence event invalid fence object handle "
1144                                   "0x%08lx.\n",
1145                                   (unsigned long)arg->handle);
1146                         return -EINVAL;
1147                 }
1148                 fence = &(container_of(base, struct vmw_user_fence,
1149                                        base)->fence);
1150                 (void) vmw_fence_obj_reference(fence);
1151
1152                 if (user_fence_rep != NULL) {
1153                         bool existed;
1154
1155                         ret = ttm_ref_object_add(vmw_fp->tfile, base,
1156                                                  TTM_REF_USAGE, &existed);
1157                         if (unlikely(ret != 0)) {
1158                                 DRM_ERROR("Failed to reference a fence "
1159                                           "object.\n");
1160                                 goto out_no_ref_obj;
1161                         }
1162                         handle = base->hash.key;
1163                 }
1164                 ttm_base_object_unref(&base);
1165         }
1166
1167         /*
1168          * Create a new fence object.
1169          */
1170         if (!fence) {
1171                 ret = vmw_execbuf_fence_commands(file_priv, dev_priv,
1172                                                  &fence,
1173                                                  (user_fence_rep) ?
1174                                                  &handle : NULL);
1175                 if (unlikely(ret != 0)) {
1176                         DRM_ERROR("Fence event failed to create fence.\n");
1177                         return ret;
1178                 }
1179         }
1180
1181         BUG_ON(fence == NULL);
1182
1183         if (arg->flags & DRM_VMW_FE_FLAG_REQ_TIME)
1184                 ret = vmw_event_fence_action_create(file_priv, fence,
1185                                                     arg->flags,
1186                                                     arg->user_data,
1187                                                     true);
1188         else
1189                 ret = vmw_event_fence_action_create(file_priv, fence,
1190                                                     arg->flags,
1191                                                     arg->user_data,
1192                                                     true);
1193
1194         if (unlikely(ret != 0)) {
1195                 if (ret != -ERESTARTSYS)
1196                         DRM_ERROR("Failed to attach event to fence.\n");
1197                 goto out_no_create;
1198         }
1199
1200         vmw_execbuf_copy_fence_user(dev_priv, vmw_fp, 0, user_fence_rep, fence,
1201                                     handle);
1202         vmw_fence_obj_unreference(&fence);
1203         return 0;
1204 out_no_create:
1205         if (user_fence_rep != NULL)
1206                 ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
1207                                           handle, TTM_REF_USAGE);
1208 out_no_ref_obj:
1209         vmw_fence_obj_unreference(&fence);
1210         return ret;
1211 }