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