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1// SPDX-License-Identifier: GPL-2.0 OR MIT2/**************************************************************************3 *4 * Copyright 2011-2023 VMware, Inc., Palo Alto, CA., USA5 *6 * Permission is hereby granted, free of charge, to any person obtaining a7 * copy of this software and associated documentation files (the8 * "Software"), to deal in the Software without restriction, including9 * without limitation the rights to use, copy, modify, merge, publish,10 * distribute, sub license, and/or sell copies of the Software, and to11 * permit persons to whom the Software is furnished to do so, subject to12 * the following conditions:13 *14 * The above copyright notice and this permission notice (including the15 * next paragraph) shall be included in all copies or substantial portions16 * of the Software.17 *18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL21 * 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 OR23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE24 * USE OR OTHER DEALINGS IN THE SOFTWARE.25 *26 **************************************************************************/27 28#include <linux/sched/signal.h>29 30#include "vmwgfx_drv.h"31 32#define VMW_FENCE_WRAP (1 << 31)33 34struct vmw_fence_manager {35 struct vmw_private *dev_priv;36 spinlock_t lock;37 struct list_head fence_list;38 struct work_struct work;39 bool fifo_down;40 struct list_head cleanup_list;41 uint32_t pending_actions[VMW_ACTION_MAX];42 struct mutex goal_irq_mutex;43 bool goal_irq_on; /* Protected by @goal_irq_mutex */44 bool seqno_valid; /* Protected by @lock, and may not be set to true45 without the @goal_irq_mutex held. */46 u64 ctx;47};48 49struct vmw_user_fence {50 struct ttm_base_object base;51 struct vmw_fence_obj fence;52};53 54/**55 * struct vmw_event_fence_action - fence action that delivers a drm event.56 *57 * @action: A struct vmw_fence_action to hook up to a fence.58 * @event: A pointer to the pending event.59 * @fence: A referenced pointer to the fence to keep it alive while @action60 * hangs on it.61 * @dev: Pointer to a struct drm_device so we can access the event stuff.62 * @tv_sec: If non-null, the variable pointed to will be assigned63 * current time tv_sec val when the fence signals.64 * @tv_usec: Must be set if @tv_sec is set, and the variable pointed to will65 * be assigned the current time tv_usec val when the fence signals.66 */67struct vmw_event_fence_action {68 struct vmw_fence_action action;69 70 struct drm_pending_event *event;71 struct vmw_fence_obj *fence;72 struct drm_device *dev;73 74 uint32_t *tv_sec;75 uint32_t *tv_usec;76};77 78static struct vmw_fence_manager *79fman_from_fence(struct vmw_fence_obj *fence)80{81 return container_of(fence->base.lock, struct vmw_fence_manager, lock);82}83 84static u32 vmw_fence_goal_read(struct vmw_private *vmw)85{86 if ((vmw->capabilities2 & SVGA_CAP2_EXTRA_REGS) != 0)87 return vmw_read(vmw, SVGA_REG_FENCE_GOAL);88 else89 return vmw_fifo_mem_read(vmw, SVGA_FIFO_FENCE_GOAL);90}91 92static void vmw_fence_goal_write(struct vmw_private *vmw, u32 value)93{94 if ((vmw->capabilities2 & SVGA_CAP2_EXTRA_REGS) != 0)95 vmw_write(vmw, SVGA_REG_FENCE_GOAL, value);96 else97 vmw_fifo_mem_write(vmw, SVGA_FIFO_FENCE_GOAL, value);98}99 100/*101 * Note on fencing subsystem usage of irqs:102 * Typically the vmw_fences_update function is called103 *104 * a) When a new fence seqno has been submitted by the fifo code.105 * b) On-demand when we have waiters. Sleeping waiters will switch on the106 * ANY_FENCE irq and call vmw_fences_update function each time an ANY_FENCE107 * irq is received. When the last fence waiter is gone, that IRQ is masked108 * away.109 *110 * In situations where there are no waiters and we don't submit any new fences,111 * fence objects may not be signaled. This is perfectly OK, since there are112 * no consumers of the signaled data, but that is NOT ok when there are fence113 * actions attached to a fence. The fencing subsystem then makes use of the114 * FENCE_GOAL irq and sets the fence goal seqno to that of the next fence115 * which has an action attached, and each time vmw_fences_update is called,116 * the subsystem makes sure the fence goal seqno is updated.117 *118 * The fence goal seqno irq is on as long as there are unsignaled fence119 * objects with actions attached to them.120 */121 122static void vmw_fence_obj_destroy(struct dma_fence *f)123{124 struct vmw_fence_obj *fence =125 container_of(f, struct vmw_fence_obj, base);126 struct vmw_fence_manager *fman = fman_from_fence(fence);127 128 if (!list_empty(&fence->head)) {129 spin_lock(&fman->lock);130 list_del_init(&fence->head);131 spin_unlock(&fman->lock);132 }133 fence->destroy(fence);134}135 136static const char *vmw_fence_get_driver_name(struct dma_fence *f)137{138 return "vmwgfx";139}140 141static const char *vmw_fence_get_timeline_name(struct dma_fence *f)142{143 return "svga";144}145 146static bool vmw_fence_enable_signaling(struct dma_fence *f)147{148 struct vmw_fence_obj *fence =149 container_of(f, struct vmw_fence_obj, base);150 151 struct vmw_fence_manager *fman = fman_from_fence(fence);152 struct vmw_private *dev_priv = fman->dev_priv;153 154 u32 seqno = vmw_fence_read(dev_priv);155 if (seqno - fence->base.seqno < VMW_FENCE_WRAP)156 return false;157 158 return true;159}160 161struct vmwgfx_wait_cb {162 struct dma_fence_cb base;163 struct task_struct *task;164};165 166static void167vmwgfx_wait_cb(struct dma_fence *fence, struct dma_fence_cb *cb)168{169 struct vmwgfx_wait_cb *wait =170 container_of(cb, struct vmwgfx_wait_cb, base);171 172 wake_up_process(wait->task);173}174 175static void __vmw_fences_update(struct vmw_fence_manager *fman);176 177static long vmw_fence_wait(struct dma_fence *f, bool intr, signed long timeout)178{179 struct vmw_fence_obj *fence =180 container_of(f, struct vmw_fence_obj, base);181 182 struct vmw_fence_manager *fman = fman_from_fence(fence);183 struct vmw_private *dev_priv = fman->dev_priv;184 struct vmwgfx_wait_cb cb;185 long ret = timeout;186 187 if (likely(vmw_fence_obj_signaled(fence)))188 return timeout;189 190 vmw_seqno_waiter_add(dev_priv);191 192 spin_lock(f->lock);193 194 if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &f->flags))195 goto out;196 197 if (intr && signal_pending(current)) {198 ret = -ERESTARTSYS;199 goto out;200 }201 202 cb.base.func = vmwgfx_wait_cb;203 cb.task = current;204 list_add(&cb.base.node, &f->cb_list);205 206 for (;;) {207 __vmw_fences_update(fman);208 209 /*210 * We can use the barrier free __set_current_state() since211 * DMA_FENCE_FLAG_SIGNALED_BIT + wakeup is protected by the212 * fence spinlock.213 */214 if (intr)215 __set_current_state(TASK_INTERRUPTIBLE);216 else217 __set_current_state(TASK_UNINTERRUPTIBLE);218 219 if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &f->flags)) {220 if (ret == 0 && timeout > 0)221 ret = 1;222 break;223 }224 225 if (intr && signal_pending(current)) {226 ret = -ERESTARTSYS;227 break;228 }229 230 if (ret == 0)231 break;232 233 spin_unlock(f->lock);234 235 ret = schedule_timeout(ret);236 237 spin_lock(f->lock);238 }239 __set_current_state(TASK_RUNNING);240 if (!list_empty(&cb.base.node))241 list_del(&cb.base.node);242 243out:244 spin_unlock(f->lock);245 246 vmw_seqno_waiter_remove(dev_priv);247 248 return ret;249}250 251static const struct dma_fence_ops vmw_fence_ops = {252 .get_driver_name = vmw_fence_get_driver_name,253 .get_timeline_name = vmw_fence_get_timeline_name,254 .enable_signaling = vmw_fence_enable_signaling,255 .wait = vmw_fence_wait,256 .release = vmw_fence_obj_destroy,257};258 259/*260 * Execute signal actions on fences recently signaled.261 * This is done from a workqueue so we don't have to execute262 * signal actions from atomic context.263 */264 265static void vmw_fence_work_func(struct work_struct *work)266{267 struct vmw_fence_manager *fman =268 container_of(work, struct vmw_fence_manager, work);269 struct list_head list;270 struct vmw_fence_action *action, *next_action;271 bool seqno_valid;272 273 do {274 INIT_LIST_HEAD(&list);275 mutex_lock(&fman->goal_irq_mutex);276 277 spin_lock(&fman->lock);278 list_splice_init(&fman->cleanup_list, &list);279 seqno_valid = fman->seqno_valid;280 spin_unlock(&fman->lock);281 282 if (!seqno_valid && fman->goal_irq_on) {283 fman->goal_irq_on = false;284 vmw_goal_waiter_remove(fman->dev_priv);285 }286 mutex_unlock(&fman->goal_irq_mutex);287 288 if (list_empty(&list))289 return;290 291 /*292 * At this point, only we should be able to manipulate the293 * list heads of the actions we have on the private list.294 * hence fman::lock not held.295 */296 297 list_for_each_entry_safe(action, next_action, &list, head) {298 list_del_init(&action->head);299 if (action->cleanup)300 action->cleanup(action);301 }302 } while (1);303}304 305struct vmw_fence_manager *vmw_fence_manager_init(struct vmw_private *dev_priv)306{307 struct vmw_fence_manager *fman = kzalloc(sizeof(*fman), GFP_KERNEL);308 309 if (unlikely(!fman))310 return NULL;311 312 fman->dev_priv = dev_priv;313 spin_lock_init(&fman->lock);314 INIT_LIST_HEAD(&fman->fence_list);315 INIT_LIST_HEAD(&fman->cleanup_list);316 INIT_WORK(&fman->work, &vmw_fence_work_func);317 fman->fifo_down = true;318 mutex_init(&fman->goal_irq_mutex);319 fman->ctx = dma_fence_context_alloc(1);320 321 return fman;322}323 324void vmw_fence_manager_takedown(struct vmw_fence_manager *fman)325{326 bool lists_empty;327 328 (void) cancel_work_sync(&fman->work);329 330 spin_lock(&fman->lock);331 lists_empty = list_empty(&fman->fence_list) &&332 list_empty(&fman->cleanup_list);333 spin_unlock(&fman->lock);334 335 BUG_ON(!lists_empty);336 kfree(fman);337}338 339static int vmw_fence_obj_init(struct vmw_fence_manager *fman,340 struct vmw_fence_obj *fence, u32 seqno,341 void (*destroy) (struct vmw_fence_obj *fence))342{343 int ret = 0;344 345 dma_fence_init(&fence->base, &vmw_fence_ops, &fman->lock,346 fman->ctx, seqno);347 INIT_LIST_HEAD(&fence->seq_passed_actions);348 fence->destroy = destroy;349 350 spin_lock(&fman->lock);351 if (unlikely(fman->fifo_down)) {352 ret = -EBUSY;353 goto out_unlock;354 }355 list_add_tail(&fence->head, &fman->fence_list);356 357out_unlock:358 spin_unlock(&fman->lock);359 return ret;360 361}362 363static 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 that376 * 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 goal385 * 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, and392 * we might need to update the fence goal. It checks to see whether393 * the current fence goal has already passed, and, in that case,394 * scans through all unsignaled fences to get the next fence object with an395 * 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 */399static bool vmw_fence_goal_new_locked(struct vmw_fence_manager *fman,400 u32 passed_seqno)401{402 u32 goal_seqno;403 struct vmw_fence_obj *fence, *next_fence;404 405 if (likely(!fman->seqno_valid))406 return false;407 408 goal_seqno = vmw_fence_goal_read(fman->dev_priv);409 if (likely(passed_seqno - goal_seqno >= VMW_FENCE_WRAP))410 return false;411 412 fman->seqno_valid = false;413 list_for_each_entry_safe(fence, next_fence, &fman->fence_list, head) {414 if (!list_empty(&fence->seq_passed_actions)) {415 fman->seqno_valid = true;416 vmw_fence_goal_write(fman->dev_priv,417 fence->base.seqno);418 break;419 }420 }421 422 return true;423}424 425 426/**427 * vmw_fence_goal_check_locked - Replace the device fence goal seqno if428 * needed.429 *430 * @fence: Pointer to a struct vmw_fence_obj the seqno of which should be431 * considered as a device fence goal.432 *433 * This function should be called with the fence manager lock held.434 * It is typically called when an action has been attached to a fence to435 * check whether the seqno of that fence should be used for a fence436 * goal interrupt. This is typically needed if the current fence goal is437 * invalid, or has a higher seqno than that of the current fence object.438 *439 * returns true if the device goal seqno was updated. False otherwise.440 */441static bool vmw_fence_goal_check_locked(struct vmw_fence_obj *fence)442{443 struct vmw_fence_manager *fman = fman_from_fence(fence);444 u32 goal_seqno;445 446 if (dma_fence_is_signaled_locked(&fence->base))447 return false;448 449 goal_seqno = vmw_fence_goal_read(fman->dev_priv);450 if (likely(fman->seqno_valid &&451 goal_seqno - fence->base.seqno < VMW_FENCE_WRAP))452 return false;453 454 vmw_fence_goal_write(fman->dev_priv, fence->base.seqno);455 fman->seqno_valid = true;456 457 return true;458}459 460static void __vmw_fences_update(struct vmw_fence_manager *fman)461{462 struct vmw_fence_obj *fence, *next_fence;463 struct list_head action_list;464 bool needs_rerun;465 uint32_t seqno, new_seqno;466 467 seqno = vmw_fence_read(fman->dev_priv);468rerun:469 list_for_each_entry_safe(fence, next_fence, &fman->fence_list, head) {470 if (seqno - fence->base.seqno < VMW_FENCE_WRAP) {471 list_del_init(&fence->head);472 dma_fence_signal_locked(&fence->base);473 INIT_LIST_HEAD(&action_list);474 list_splice_init(&fence->seq_passed_actions,475 &action_list);476 vmw_fences_perform_actions(fman, &action_list);477 } else478 break;479 }480 481 /*482 * Rerun if the fence goal seqno was updated, and the483 * hardware might have raced with that update, so that484 * we missed a fence_goal irq.485 */486 487 needs_rerun = vmw_fence_goal_new_locked(fman, seqno);488 if (unlikely(needs_rerun)) {489 new_seqno = vmw_fence_read(fman->dev_priv);490 if (new_seqno != seqno) {491 seqno = new_seqno;492 goto rerun;493 }494 }495 496 if (!list_empty(&fman->cleanup_list))497 (void) schedule_work(&fman->work);498}499 500void vmw_fences_update(struct vmw_fence_manager *fman)501{502 spin_lock(&fman->lock);503 __vmw_fences_update(fman);504 spin_unlock(&fman->lock);505}506 507bool vmw_fence_obj_signaled(struct vmw_fence_obj *fence)508{509 struct vmw_fence_manager *fman = fman_from_fence(fence);510 511 if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))512 return true;513 514 vmw_fences_update(fman);515 516 return dma_fence_is_signaled(&fence->base);517}518 519int vmw_fence_obj_wait(struct vmw_fence_obj *fence, bool lazy,520 bool interruptible, unsigned long timeout)521{522 long ret = dma_fence_wait_timeout(&fence->base, interruptible, timeout);523 524 if (likely(ret > 0))525 return 0;526 else if (ret == 0)527 return -EBUSY;528 else529 return ret;530}531 532static void vmw_fence_destroy(struct vmw_fence_obj *fence)533{534 dma_fence_free(&fence->base);535}536 537int vmw_fence_create(struct vmw_fence_manager *fman,538 uint32_t seqno,539 struct vmw_fence_obj **p_fence)540{541 struct vmw_fence_obj *fence;542 int ret;543 544 fence = kzalloc(sizeof(*fence), GFP_KERNEL);545 if (unlikely(!fence))546 return -ENOMEM;547 548 ret = vmw_fence_obj_init(fman, fence, seqno,549 vmw_fence_destroy);550 if (unlikely(ret != 0))551 goto out_err_init;552 553 *p_fence = fence;554 return 0;555 556out_err_init:557 kfree(fence);558 return ret;559}560 561 562static void vmw_user_fence_destroy(struct vmw_fence_obj *fence)563{564 struct vmw_user_fence *ufence =565 container_of(fence, struct vmw_user_fence, fence);566 567 ttm_base_object_kfree(ufence, base);568}569 570static void vmw_user_fence_base_release(struct ttm_base_object **p_base)571{572 struct ttm_base_object *base = *p_base;573 struct vmw_user_fence *ufence =574 container_of(base, struct vmw_user_fence, base);575 struct vmw_fence_obj *fence = &ufence->fence;576 577 *p_base = NULL;578 vmw_fence_obj_unreference(&fence);579}580 581int vmw_user_fence_create(struct drm_file *file_priv,582 struct vmw_fence_manager *fman,583 uint32_t seqno,584 struct vmw_fence_obj **p_fence,585 uint32_t *p_handle)586{587 struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;588 struct vmw_user_fence *ufence;589 struct vmw_fence_obj *tmp;590 int ret;591 592 ufence = kzalloc(sizeof(*ufence), GFP_KERNEL);593 if (unlikely(!ufence)) {594 ret = -ENOMEM;595 goto out_no_object;596 }597 598 ret = vmw_fence_obj_init(fman, &ufence->fence, seqno,599 vmw_user_fence_destroy);600 if (unlikely(ret != 0)) {601 kfree(ufence);602 goto out_no_object;603 }604 605 /*606 * The base object holds a reference which is freed in607 * vmw_user_fence_base_release.608 */609 tmp = vmw_fence_obj_reference(&ufence->fence);610 611 ret = ttm_base_object_init(tfile, &ufence->base, false,612 VMW_RES_FENCE,613 &vmw_user_fence_base_release);614 615 616 if (unlikely(ret != 0)) {617 /*618 * Free the base object's reference619 */620 vmw_fence_obj_unreference(&tmp);621 goto out_err;622 }623 624 *p_fence = &ufence->fence;625 *p_handle = ufence->base.handle;626 627 return 0;628out_err:629 tmp = &ufence->fence;630 vmw_fence_obj_unreference(&tmp);631out_no_object:632 return ret;633}634 635/*636 * vmw_fence_fifo_down - signal all unsignaled fence objects.637 */638 639void vmw_fence_fifo_down(struct vmw_fence_manager *fman)640{641 struct list_head action_list;642 int ret;643 644 /*645 * The list may be altered while we traverse it, so always646 * restart when we've released the fman->lock.647 */648 649 spin_lock(&fman->lock);650 fman->fifo_down = true;651 while (!list_empty(&fman->fence_list)) {652 struct vmw_fence_obj *fence =653 list_entry(fman->fence_list.prev, struct vmw_fence_obj,654 head);655 dma_fence_get(&fence->base);656 spin_unlock(&fman->lock);657 658 ret = vmw_fence_obj_wait(fence, false, false,659 VMW_FENCE_WAIT_TIMEOUT);660 661 if (unlikely(ret != 0)) {662 list_del_init(&fence->head);663 dma_fence_signal(&fence->base);664 INIT_LIST_HEAD(&action_list);665 list_splice_init(&fence->seq_passed_actions,666 &action_list);667 vmw_fences_perform_actions(fman, &action_list);668 }669 670 BUG_ON(!list_empty(&fence->head));671 dma_fence_put(&fence->base);672 spin_lock(&fman->lock);673 }674 spin_unlock(&fman->lock);675}676 677void vmw_fence_fifo_up(struct vmw_fence_manager *fman)678{679 spin_lock(&fman->lock);680 fman->fifo_down = false;681 spin_unlock(&fman->lock);682}683 684 685/**686 * vmw_fence_obj_lookup - Look up a user-space fence object687 *688 * @tfile: A struct ttm_object_file identifying the caller.689 * @handle: A handle identifying the fence object.690 * @return: A struct vmw_user_fence base ttm object on success or691 * an error pointer on failure.692 *693 * The fence object is looked up and type-checked. The caller needs694 * to have opened the fence object first, but since that happens on695 * creation and fence objects aren't shareable, that's not an696 * issue currently.697 */698static struct ttm_base_object *699vmw_fence_obj_lookup(struct ttm_object_file *tfile, u32 handle)700{701 struct ttm_base_object *base = ttm_base_object_lookup(tfile, handle);702 703 if (!base) {704 pr_err("Invalid fence object handle 0x%08lx.\n",705 (unsigned long)handle);706 return ERR_PTR(-EINVAL);707 }708 709 if (base->refcount_release != vmw_user_fence_base_release) {710 pr_err("Invalid fence object handle 0x%08lx.\n",711 (unsigned long)handle);712 ttm_base_object_unref(&base);713 return ERR_PTR(-EINVAL);714 }715 716 return base;717}718 719 720int vmw_fence_obj_wait_ioctl(struct drm_device *dev, void *data,721 struct drm_file *file_priv)722{723 struct drm_vmw_fence_wait_arg *arg =724 (struct drm_vmw_fence_wait_arg *)data;725 unsigned long timeout;726 struct ttm_base_object *base;727 struct vmw_fence_obj *fence;728 struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;729 int ret;730 uint64_t wait_timeout = ((uint64_t)arg->timeout_us * HZ);731 732 /*733 * 64-bit division not present on 32-bit systems, so do an734 * approximation. (Divide by 1000000).735 */736 737 wait_timeout = (wait_timeout >> 20) + (wait_timeout >> 24) -738 (wait_timeout >> 26);739 740 if (!arg->cookie_valid) {741 arg->cookie_valid = 1;742 arg->kernel_cookie = jiffies + wait_timeout;743 }744 745 base = vmw_fence_obj_lookup(tfile, arg->handle);746 if (IS_ERR(base))747 return PTR_ERR(base);748 749 fence = &(container_of(base, struct vmw_user_fence, base)->fence);750 751 timeout = jiffies;752 if (time_after_eq(timeout, (unsigned long)arg->kernel_cookie)) {753 ret = ((vmw_fence_obj_signaled(fence)) ?754 0 : -EBUSY);755 goto out;756 }757 758 timeout = (unsigned long)arg->kernel_cookie - timeout;759 760 ret = vmw_fence_obj_wait(fence, arg->lazy, true, timeout);761 762out:763 ttm_base_object_unref(&base);764 765 /*766 * Optionally unref the fence object.767 */768 769 if (ret == 0 && (arg->wait_options & DRM_VMW_WAIT_OPTION_UNREF))770 return ttm_ref_object_base_unref(tfile, arg->handle);771 return ret;772}773 774int vmw_fence_obj_signaled_ioctl(struct drm_device *dev, void *data,775 struct drm_file *file_priv)776{777 struct drm_vmw_fence_signaled_arg *arg =778 (struct drm_vmw_fence_signaled_arg *) data;779 struct ttm_base_object *base;780 struct vmw_fence_obj *fence;781 struct vmw_fence_manager *fman;782 struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;783 struct vmw_private *dev_priv = vmw_priv(dev);784 785 base = vmw_fence_obj_lookup(tfile, arg->handle);786 if (IS_ERR(base))787 return PTR_ERR(base);788 789 fence = &(container_of(base, struct vmw_user_fence, base)->fence);790 fman = fman_from_fence(fence);791 792 arg->signaled = vmw_fence_obj_signaled(fence);793 794 arg->signaled_flags = arg->flags;795 spin_lock(&fman->lock);796 arg->passed_seqno = dev_priv->last_read_seqno;797 spin_unlock(&fman->lock);798 799 ttm_base_object_unref(&base);800 801 return 0;802}803 804 805int vmw_fence_obj_unref_ioctl(struct drm_device *dev, void *data,806 struct drm_file *file_priv)807{808 struct drm_vmw_fence_arg *arg =809 (struct drm_vmw_fence_arg *) data;810 811 return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,812 arg->handle);813}814 815/**816 * vmw_event_fence_action_seq_passed817 *818 * @action: The struct vmw_fence_action embedded in a struct819 * vmw_event_fence_action.820 *821 * This function is called when the seqno of the fence where @action is822 * attached has passed. It queues the event on the submitter's event list.823 * This function is always called from atomic context.824 */825static void vmw_event_fence_action_seq_passed(struct vmw_fence_action *action)826{827 struct vmw_event_fence_action *eaction =828 container_of(action, struct vmw_event_fence_action, action);829 struct drm_device *dev = eaction->dev;830 struct drm_pending_event *event = eaction->event;831 832 if (unlikely(event == NULL))833 return;834 835 spin_lock_irq(&dev->event_lock);836 837 if (likely(eaction->tv_sec != NULL)) {838 struct timespec64 ts;839 840 ktime_get_ts64(&ts);841 /* monotonic time, so no y2038 overflow */842 *eaction->tv_sec = ts.tv_sec;843 *eaction->tv_usec = ts.tv_nsec / NSEC_PER_USEC;844 }845 846 drm_send_event_locked(dev, eaction->event);847 eaction->event = NULL;848 spin_unlock_irq(&dev->event_lock);849}850 851/**852 * vmw_event_fence_action_cleanup853 *854 * @action: The struct vmw_fence_action embedded in a struct855 * vmw_event_fence_action.856 *857 * This function is the struct vmw_fence_action destructor. It's typically858 * called from a workqueue.859 */860static void vmw_event_fence_action_cleanup(struct vmw_fence_action *action)861{862 struct vmw_event_fence_action *eaction =863 container_of(action, struct vmw_event_fence_action, action);864 865 vmw_fence_obj_unreference(&eaction->fence);866 kfree(eaction);867}868 869 870/**871 * vmw_fence_obj_add_action - Add an action to a fence object.872 *873 * @fence: The fence object.874 * @action: The action to add.875 *876 * Note that the action callbacks may be executed before this function877 * returns.878 */879static void vmw_fence_obj_add_action(struct vmw_fence_obj *fence,880 struct vmw_fence_action *action)881{882 struct vmw_fence_manager *fman = fman_from_fence(fence);883 bool run_update = false;884 885 mutex_lock(&fman->goal_irq_mutex);886 spin_lock(&fman->lock);887 888 fman->pending_actions[action->type]++;889 if (dma_fence_is_signaled_locked(&fence->base)) {890 struct list_head action_list;891 892 INIT_LIST_HEAD(&action_list);893 list_add_tail(&action->head, &action_list);894 vmw_fences_perform_actions(fman, &action_list);895 } else {896 list_add_tail(&action->head, &fence->seq_passed_actions);897 898 /*899 * This function may set fman::seqno_valid, so it must900 * be run with the goal_irq_mutex held.901 */902 run_update = vmw_fence_goal_check_locked(fence);903 }904 905 spin_unlock(&fman->lock);906 907 if (run_update) {908 if (!fman->goal_irq_on) {909 fman->goal_irq_on = true;910 vmw_goal_waiter_add(fman->dev_priv);911 }912 vmw_fences_update(fman);913 }914 mutex_unlock(&fman->goal_irq_mutex);915 916}917 918/**919 * vmw_event_fence_action_queue - Post an event for sending when a fence920 * object seqno has passed.921 *922 * @file_priv: The file connection on which the event should be posted.923 * @fence: The fence object on which to post the event.924 * @event: Event to be posted. This event should've been alloced925 * using k[mz]alloc, and should've been completely initialized.926 * @tv_sec: If non-null, the variable pointed to will be assigned927 * current time tv_sec val when the fence signals.928 * @tv_usec: Must be set if @tv_sec is set, and the variable pointed to will929 * be assigned the current time tv_usec val when the fence signals.930 * @interruptible: Interruptible waits if possible.931 *932 * As a side effect, the object pointed to by @event may have been933 * freed when this function returns. If this function returns with934 * an error code, the caller needs to free that object.935 */936 937int vmw_event_fence_action_queue(struct drm_file *file_priv,938 struct vmw_fence_obj *fence,939 struct drm_pending_event *event,940 uint32_t *tv_sec,941 uint32_t *tv_usec,942 bool interruptible)943{944 struct vmw_event_fence_action *eaction;945 struct vmw_fence_manager *fman = fman_from_fence(fence);946 947 eaction = kzalloc(sizeof(*eaction), GFP_KERNEL);948 if (unlikely(!eaction))949 return -ENOMEM;950 951 eaction->event = event;952 953 eaction->action.seq_passed = vmw_event_fence_action_seq_passed;954 eaction->action.cleanup = vmw_event_fence_action_cleanup;955 eaction->action.type = VMW_ACTION_EVENT;956 957 eaction->fence = vmw_fence_obj_reference(fence);958 eaction->dev = &fman->dev_priv->drm;959 eaction->tv_sec = tv_sec;960 eaction->tv_usec = tv_usec;961 962 vmw_fence_obj_add_action(fence, &eaction->action);963 964 return 0;965}966 967struct vmw_event_fence_pending {968 struct drm_pending_event base;969 struct drm_vmw_event_fence event;970};971 972static int vmw_event_fence_action_create(struct drm_file *file_priv,973 struct vmw_fence_obj *fence,974 uint32_t flags,975 uint64_t user_data,976 bool interruptible)977{978 struct vmw_event_fence_pending *event;979 struct vmw_fence_manager *fman = fman_from_fence(fence);980 struct drm_device *dev = &fman->dev_priv->drm;981 int ret;982 983 event = kzalloc(sizeof(*event), GFP_KERNEL);984 if (unlikely(!event)) {985 DRM_ERROR("Failed to allocate an event.\n");986 ret = -ENOMEM;987 goto out_no_space;988 }989 990 event->event.base.type = DRM_VMW_EVENT_FENCE_SIGNALED;991 event->event.base.length = sizeof(event->event);992 event->event.user_data = user_data;993 994 ret = drm_event_reserve_init(dev, file_priv, &event->base, &event->event.base);995 996 if (unlikely(ret != 0)) {997 DRM_ERROR("Failed to allocate event space for this file.\n");998 kfree(event);999 goto out_no_space;1000 }1001 1002 if (flags & DRM_VMW_FE_FLAG_REQ_TIME)1003 ret = vmw_event_fence_action_queue(file_priv, fence,1004 &event->base,1005 &event->event.tv_sec,1006 &event->event.tv_usec,1007 interruptible);1008 else1009 ret = vmw_event_fence_action_queue(file_priv, fence,1010 &event->base,1011 NULL,1012 NULL,1013 interruptible);1014 if (ret != 0)1015 goto out_no_queue;1016 1017 return 0;1018 1019out_no_queue:1020 drm_event_cancel_free(dev, &event->base);1021out_no_space:1022 return ret;1023}1024 1025int vmw_fence_event_ioctl(struct drm_device *dev, void *data,1026 struct drm_file *file_priv)1027{1028 struct vmw_private *dev_priv = vmw_priv(dev);1029 struct drm_vmw_fence_event_arg *arg =1030 (struct drm_vmw_fence_event_arg *) data;1031 struct vmw_fence_obj *fence = NULL;1032 struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);1033 struct ttm_object_file *tfile = vmw_fp->tfile;1034 struct drm_vmw_fence_rep __user *user_fence_rep =1035 (struct drm_vmw_fence_rep __user *)(unsigned long)1036 arg->fence_rep;1037 uint32_t handle;1038 int ret;1039 1040 /*1041 * Look up an existing fence object,1042 * and if user-space wants a new reference,1043 * add one.1044 */1045 if (arg->handle) {1046 struct ttm_base_object *base =1047 vmw_fence_obj_lookup(tfile, arg->handle);1048 1049 if (IS_ERR(base))1050 return PTR_ERR(base);1051 1052 fence = &(container_of(base, struct vmw_user_fence,1053 base)->fence);1054 (void) vmw_fence_obj_reference(fence);1055 1056 if (user_fence_rep != NULL) {1057 ret = ttm_ref_object_add(vmw_fp->tfile, base,1058 NULL, false);1059 if (unlikely(ret != 0)) {1060 DRM_ERROR("Failed to reference a fence "1061 "object.\n");1062 goto out_no_ref_obj;1063 }1064 handle = base->handle;1065 }1066 ttm_base_object_unref(&base);1067 }1068 1069 /*1070 * Create a new fence object.1071 */1072 if (!fence) {1073 ret = vmw_execbuf_fence_commands(file_priv, dev_priv,1074 &fence,1075 (user_fence_rep) ?1076 &handle : NULL);1077 if (unlikely(ret != 0)) {1078 DRM_ERROR("Fence event failed to create fence.\n");1079 return ret;1080 }1081 }1082 1083 BUG_ON(fence == NULL);1084 1085 ret = vmw_event_fence_action_create(file_priv, fence,1086 arg->flags,1087 arg->user_data,1088 true);1089 if (unlikely(ret != 0)) {1090 if (ret != -ERESTARTSYS)1091 DRM_ERROR("Failed to attach event to fence.\n");1092 goto out_no_create;1093 }1094 1095 vmw_execbuf_copy_fence_user(dev_priv, vmw_fp, 0, user_fence_rep, fence,1096 handle, -1);1097 vmw_fence_obj_unreference(&fence);1098 return 0;1099out_no_create:1100 if (user_fence_rep != NULL)1101 ttm_ref_object_base_unref(tfile, handle);1102out_no_ref_obj:1103 vmw_fence_obj_unreference(&fence);1104 return ret;1105}1106