1 /**************************************************************************
3 * Copyright © 2011-2014 VMware, Inc., Palo Alto, CA., USA
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
29 #include "vmwgfx_drv.h"
31 #define VMW_FENCE_WRAP (1 << 31)
33 struct vmw_fence_manager {
34 int num_fence_objects;
35 struct vmw_private *dev_priv;
37 struct list_head fence_list;
38 struct work_struct work;
41 u32 event_fence_action_size;
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. */
52 struct vmw_user_fence {
53 struct ttm_base_object base;
54 struct vmw_fence_obj fence;
58 * struct vmw_event_fence_action - fence action that delivers a drm event.
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
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.
72 struct vmw_event_fence_action {
73 struct vmw_fence_action action;
75 struct drm_pending_event *event;
76 struct vmw_fence_obj *fence;
77 struct drm_device *dev;
83 static struct vmw_fence_manager *
84 fman_from_fence(struct vmw_fence_obj *fence)
86 return container_of(fence->base.lock, struct vmw_fence_manager, lock);
90 * Note on fencing subsystem usage of irqs:
91 * Typically the vmw_fences_update function is called
93 * a) When a new fence seqno has been submitted by the fifo code.
94 * b) On-demand when we have waiters. Sleeping waiters will switch on the
95 * ANY_FENCE irq and call vmw_fences_update function each time an ANY_FENCE
96 * irq is received. When the last fence waiter is gone, that IRQ is masked
99 * In situations where there are no waiters and we don't submit any new fences,
100 * fence objects may not be signaled. This is perfectly OK, since there are
101 * no consumers of the signaled data, but that is NOT ok when there are fence
102 * actions attached to a fence. The fencing subsystem then makes use of the
103 * FENCE_GOAL irq and sets the fence goal seqno to that of the next fence
104 * which has an action attached, and each time vmw_fences_update is called,
105 * the subsystem makes sure the fence goal seqno is updated.
107 * The fence goal seqno irq is on as long as there are unsignaled fence
108 * objects with actions attached to them.
111 static void vmw_fence_obj_destroy(struct dma_fence *f)
113 struct vmw_fence_obj *fence =
114 container_of(f, struct vmw_fence_obj, base);
116 struct vmw_fence_manager *fman = fman_from_fence(fence);
118 spin_lock(&fman->lock);
119 list_del_init(&fence->head);
120 --fman->num_fence_objects;
121 spin_unlock(&fman->lock);
122 fence->destroy(fence);
125 static const char *vmw_fence_get_driver_name(struct dma_fence *f)
130 static const char *vmw_fence_get_timeline_name(struct dma_fence *f)
135 static bool vmw_fence_enable_signaling(struct dma_fence *f)
137 struct vmw_fence_obj *fence =
138 container_of(f, struct vmw_fence_obj, base);
140 struct vmw_fence_manager *fman = fman_from_fence(fence);
141 struct vmw_private *dev_priv = fman->dev_priv;
143 u32 *fifo_mem = dev_priv->mmio_virt;
144 u32 seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
145 if (seqno - fence->base.seqno < VMW_FENCE_WRAP)
148 vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
153 struct vmwgfx_wait_cb {
154 struct dma_fence_cb base;
155 struct task_struct *task;
159 vmwgfx_wait_cb(struct dma_fence *fence, struct dma_fence_cb *cb)
161 struct vmwgfx_wait_cb *wait =
162 container_of(cb, struct vmwgfx_wait_cb, base);
164 wake_up_process(wait->task);
167 static void __vmw_fences_update(struct vmw_fence_manager *fman);
169 static long vmw_fence_wait(struct dma_fence *f, bool intr, signed long timeout)
171 struct vmw_fence_obj *fence =
172 container_of(f, struct vmw_fence_obj, base);
174 struct vmw_fence_manager *fman = fman_from_fence(fence);
175 struct vmw_private *dev_priv = fman->dev_priv;
176 struct vmwgfx_wait_cb cb;
178 unsigned long irq_flags;
180 if (likely(vmw_fence_obj_signaled(fence)))
183 vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
184 vmw_seqno_waiter_add(dev_priv);
186 spin_lock_irqsave(f->lock, irq_flags);
188 if (intr && signal_pending(current)) {
193 cb.base.func = vmwgfx_wait_cb;
195 list_add(&cb.base.node, &f->cb_list);
198 __vmw_fences_update(fman);
199 if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &f->flags))
203 __set_current_state(TASK_INTERRUPTIBLE);
205 __set_current_state(TASK_UNINTERRUPTIBLE);
206 spin_unlock_irqrestore(f->lock, irq_flags);
208 ret = schedule_timeout(ret);
210 spin_lock_irqsave(f->lock, irq_flags);
211 if (ret > 0 && intr && signal_pending(current))
215 if (!list_empty(&cb.base.node))
216 list_del(&cb.base.node);
217 __set_current_state(TASK_RUNNING);
220 spin_unlock_irqrestore(f->lock, irq_flags);
222 vmw_seqno_waiter_remove(dev_priv);
227 static const struct dma_fence_ops vmw_fence_ops = {
228 .get_driver_name = vmw_fence_get_driver_name,
229 .get_timeline_name = vmw_fence_get_timeline_name,
230 .enable_signaling = vmw_fence_enable_signaling,
231 .wait = vmw_fence_wait,
232 .release = vmw_fence_obj_destroy,
237 * Execute signal actions on fences recently signaled.
238 * This is done from a workqueue so we don't have to execute
239 * signal actions from atomic context.
242 static void vmw_fence_work_func(struct work_struct *work)
244 struct vmw_fence_manager *fman =
245 container_of(work, struct vmw_fence_manager, work);
246 struct list_head list;
247 struct vmw_fence_action *action, *next_action;
251 INIT_LIST_HEAD(&list);
252 mutex_lock(&fman->goal_irq_mutex);
254 spin_lock(&fman->lock);
255 list_splice_init(&fman->cleanup_list, &list);
256 seqno_valid = fman->seqno_valid;
257 spin_unlock(&fman->lock);
259 if (!seqno_valid && fman->goal_irq_on) {
260 fman->goal_irq_on = false;
261 vmw_goal_waiter_remove(fman->dev_priv);
263 mutex_unlock(&fman->goal_irq_mutex);
265 if (list_empty(&list))
269 * At this point, only we should be able to manipulate the
270 * list heads of the actions we have on the private list.
271 * hence fman::lock not held.
274 list_for_each_entry_safe(action, next_action, &list, head) {
275 list_del_init(&action->head);
277 action->cleanup(action);
282 struct vmw_fence_manager *vmw_fence_manager_init(struct vmw_private *dev_priv)
284 struct vmw_fence_manager *fman = kzalloc(sizeof(*fman), GFP_KERNEL);
289 fman->dev_priv = dev_priv;
290 spin_lock_init(&fman->lock);
291 INIT_LIST_HEAD(&fman->fence_list);
292 INIT_LIST_HEAD(&fman->cleanup_list);
293 INIT_WORK(&fman->work, &vmw_fence_work_func);
294 fman->fifo_down = true;
295 fman->user_fence_size = ttm_round_pot(sizeof(struct vmw_user_fence));
296 fman->fence_size = ttm_round_pot(sizeof(struct vmw_fence_obj));
297 fman->event_fence_action_size =
298 ttm_round_pot(sizeof(struct vmw_event_fence_action));
299 mutex_init(&fman->goal_irq_mutex);
300 fman->ctx = dma_fence_context_alloc(1);
305 void vmw_fence_manager_takedown(struct vmw_fence_manager *fman)
309 (void) cancel_work_sync(&fman->work);
311 spin_lock(&fman->lock);
312 lists_empty = list_empty(&fman->fence_list) &&
313 list_empty(&fman->cleanup_list);
314 spin_unlock(&fman->lock);
316 BUG_ON(!lists_empty);
320 static int vmw_fence_obj_init(struct vmw_fence_manager *fman,
321 struct vmw_fence_obj *fence, u32 seqno,
322 void (*destroy) (struct vmw_fence_obj *fence))
326 dma_fence_init(&fence->base, &vmw_fence_ops, &fman->lock,
328 INIT_LIST_HEAD(&fence->seq_passed_actions);
329 fence->destroy = destroy;
331 spin_lock(&fman->lock);
332 if (unlikely(fman->fifo_down)) {
336 list_add_tail(&fence->head, &fman->fence_list);
337 ++fman->num_fence_objects;
340 spin_unlock(&fman->lock);
345 static void vmw_fences_perform_actions(struct vmw_fence_manager *fman,
346 struct list_head *list)
348 struct vmw_fence_action *action, *next_action;
350 list_for_each_entry_safe(action, next_action, list, head) {
351 list_del_init(&action->head);
352 fman->pending_actions[action->type]--;
353 if (action->seq_passed != NULL)
354 action->seq_passed(action);
357 * Add the cleanup action to the cleanup list so that
358 * it will be performed by a worker task.
361 list_add_tail(&action->head, &fman->cleanup_list);
366 * vmw_fence_goal_new_locked - Figure out a new device fence goal
369 * @fman: Pointer to a fence manager.
370 * @passed_seqno: The seqno the device currently signals as passed.
372 * This function should be called with the fence manager lock held.
373 * It is typically called when we have a new passed_seqno, and
374 * we might need to update the fence goal. It checks to see whether
375 * the current fence goal has already passed, and, in that case,
376 * scans through all unsignaled fences to get the next fence object with an
377 * action attached, and sets the seqno of that fence as a new fence goal.
379 * returns true if the device goal seqno was updated. False otherwise.
381 static bool vmw_fence_goal_new_locked(struct vmw_fence_manager *fman,
386 struct vmw_fence_obj *fence;
388 if (likely(!fman->seqno_valid))
391 fifo_mem = fman->dev_priv->mmio_virt;
392 goal_seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE_GOAL);
393 if (likely(passed_seqno - goal_seqno >= VMW_FENCE_WRAP))
396 fman->seqno_valid = false;
397 list_for_each_entry(fence, &fman->fence_list, head) {
398 if (!list_empty(&fence->seq_passed_actions)) {
399 fman->seqno_valid = true;
400 vmw_mmio_write(fence->base.seqno,
401 fifo_mem + SVGA_FIFO_FENCE_GOAL);
411 * vmw_fence_goal_check_locked - Replace the device fence goal seqno if
414 * @fence: Pointer to a struct vmw_fence_obj the seqno of which should be
415 * considered as a device fence goal.
417 * This function should be called with the fence manager lock held.
418 * It is typically called when an action has been attached to a fence to
419 * check whether the seqno of that fence should be used for a fence
420 * goal interrupt. This is typically needed if the current fence goal is
421 * invalid, or has a higher seqno than that of the current fence object.
423 * returns true if the device goal seqno was updated. False otherwise.
425 static bool vmw_fence_goal_check_locked(struct vmw_fence_obj *fence)
427 struct vmw_fence_manager *fman = fman_from_fence(fence);
431 if (dma_fence_is_signaled_locked(&fence->base))
434 fifo_mem = fman->dev_priv->mmio_virt;
435 goal_seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE_GOAL);
436 if (likely(fman->seqno_valid &&
437 goal_seqno - fence->base.seqno < VMW_FENCE_WRAP))
440 vmw_mmio_write(fence->base.seqno, fifo_mem + SVGA_FIFO_FENCE_GOAL);
441 fman->seqno_valid = true;
446 static void __vmw_fences_update(struct vmw_fence_manager *fman)
448 struct vmw_fence_obj *fence, *next_fence;
449 struct list_head action_list;
451 uint32_t seqno, new_seqno;
452 u32 *fifo_mem = fman->dev_priv->mmio_virt;
454 seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
456 list_for_each_entry_safe(fence, next_fence, &fman->fence_list, head) {
457 if (seqno - fence->base.seqno < VMW_FENCE_WRAP) {
458 list_del_init(&fence->head);
459 dma_fence_signal_locked(&fence->base);
460 INIT_LIST_HEAD(&action_list);
461 list_splice_init(&fence->seq_passed_actions,
463 vmw_fences_perform_actions(fman, &action_list);
469 * Rerun if the fence goal seqno was updated, and the
470 * hardware might have raced with that update, so that
471 * we missed a fence_goal irq.
474 needs_rerun = vmw_fence_goal_new_locked(fman, seqno);
475 if (unlikely(needs_rerun)) {
476 new_seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
477 if (new_seqno != seqno) {
483 if (!list_empty(&fman->cleanup_list))
484 (void) schedule_work(&fman->work);
487 void vmw_fences_update(struct vmw_fence_manager *fman)
489 spin_lock(&fman->lock);
490 __vmw_fences_update(fman);
491 spin_unlock(&fman->lock);
494 bool vmw_fence_obj_signaled(struct vmw_fence_obj *fence)
496 struct vmw_fence_manager *fman = fman_from_fence(fence);
498 if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))
501 vmw_fences_update(fman);
503 return dma_fence_is_signaled(&fence->base);
506 int vmw_fence_obj_wait(struct vmw_fence_obj *fence, bool lazy,
507 bool interruptible, unsigned long timeout)
509 long ret = dma_fence_wait_timeout(&fence->base, interruptible, timeout);
519 void vmw_fence_obj_flush(struct vmw_fence_obj *fence)
521 struct vmw_private *dev_priv = fman_from_fence(fence)->dev_priv;
523 vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
526 static void vmw_fence_destroy(struct vmw_fence_obj *fence)
528 dma_fence_free(&fence->base);
531 int vmw_fence_create(struct vmw_fence_manager *fman,
533 struct vmw_fence_obj **p_fence)
535 struct vmw_fence_obj *fence;
538 fence = kzalloc(sizeof(*fence), GFP_KERNEL);
539 if (unlikely(!fence))
542 ret = vmw_fence_obj_init(fman, fence, seqno,
544 if (unlikely(ret != 0))
556 static void vmw_user_fence_destroy(struct vmw_fence_obj *fence)
558 struct vmw_user_fence *ufence =
559 container_of(fence, struct vmw_user_fence, fence);
560 struct vmw_fence_manager *fman = fman_from_fence(fence);
562 ttm_base_object_kfree(ufence, base);
564 * Free kernel space accounting.
566 ttm_mem_global_free(vmw_mem_glob(fman->dev_priv),
567 fman->user_fence_size);
570 static void vmw_user_fence_base_release(struct ttm_base_object **p_base)
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;
578 vmw_fence_obj_unreference(&fence);
581 int vmw_user_fence_create(struct drm_file *file_priv,
582 struct vmw_fence_manager *fman,
584 struct vmw_fence_obj **p_fence,
587 struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
588 struct vmw_user_fence *ufence;
589 struct vmw_fence_obj *tmp;
590 struct ttm_mem_global *mem_glob = vmw_mem_glob(fman->dev_priv);
594 * Kernel memory space accounting, since this object may
595 * be created by a user-space request.
598 ret = ttm_mem_global_alloc(mem_glob, fman->user_fence_size,
600 if (unlikely(ret != 0))
603 ufence = kzalloc(sizeof(*ufence), GFP_KERNEL);
604 if (unlikely(!ufence)) {
609 ret = vmw_fence_obj_init(fman, &ufence->fence, seqno,
610 vmw_user_fence_destroy);
611 if (unlikely(ret != 0)) {
617 * The base object holds a reference which is freed in
618 * vmw_user_fence_base_release.
620 tmp = vmw_fence_obj_reference(&ufence->fence);
621 ret = ttm_base_object_init(tfile, &ufence->base, false,
623 &vmw_user_fence_base_release, NULL);
626 if (unlikely(ret != 0)) {
628 * Free the base object's reference
630 vmw_fence_obj_unreference(&tmp);
634 *p_fence = &ufence->fence;
635 *p_handle = ufence->base.hash.key;
639 tmp = &ufence->fence;
640 vmw_fence_obj_unreference(&tmp);
642 ttm_mem_global_free(mem_glob, fman->user_fence_size);
648 * vmw_wait_dma_fence - Wait for a dma fence
650 * @fman: pointer to a fence manager
651 * @fence: DMA fence to wait on
653 * This function handles the case when the fence is actually a fence
654 * array. If that's the case, it'll wait on each of the child fence
656 int vmw_wait_dma_fence(struct vmw_fence_manager *fman,
657 struct dma_fence *fence)
659 struct dma_fence_array *fence_array;
664 if (dma_fence_is_signaled(fence))
667 if (!dma_fence_is_array(fence))
668 return dma_fence_wait(fence, true);
670 /* From i915: Note that if the fence-array was created in
671 * signal-on-any mode, we should *not* decompose it into its individual
672 * fences. However, we don't currently store which mode the fence-array
673 * is operating in. Fortunately, the only user of signal-on-any is
674 * private to amdgpu and we should not see any incoming fence-array
675 * from sync-file being in signal-on-any mode.
678 fence_array = to_dma_fence_array(fence);
679 for (i = 0; i < fence_array->num_fences; i++) {
680 struct dma_fence *child = fence_array->fences[i];
682 ret = dma_fence_wait(child, true);
693 * vmw_fence_fifo_down - signal all unsignaled fence objects.
696 void vmw_fence_fifo_down(struct vmw_fence_manager *fman)
698 struct list_head action_list;
702 * The list may be altered while we traverse it, so always
703 * restart when we've released the fman->lock.
706 spin_lock(&fman->lock);
707 fman->fifo_down = true;
708 while (!list_empty(&fman->fence_list)) {
709 struct vmw_fence_obj *fence =
710 list_entry(fman->fence_list.prev, struct vmw_fence_obj,
712 dma_fence_get(&fence->base);
713 spin_unlock(&fman->lock);
715 ret = vmw_fence_obj_wait(fence, false, false,
716 VMW_FENCE_WAIT_TIMEOUT);
718 if (unlikely(ret != 0)) {
719 list_del_init(&fence->head);
720 dma_fence_signal(&fence->base);
721 INIT_LIST_HEAD(&action_list);
722 list_splice_init(&fence->seq_passed_actions,
724 vmw_fences_perform_actions(fman, &action_list);
727 BUG_ON(!list_empty(&fence->head));
728 dma_fence_put(&fence->base);
729 spin_lock(&fman->lock);
731 spin_unlock(&fman->lock);
734 void vmw_fence_fifo_up(struct vmw_fence_manager *fman)
736 spin_lock(&fman->lock);
737 fman->fifo_down = false;
738 spin_unlock(&fman->lock);
743 * vmw_fence_obj_lookup - Look up a user-space fence object
745 * @tfile: A struct ttm_object_file identifying the caller.
746 * @handle: A handle identifying the fence object.
747 * @return: A struct vmw_user_fence base ttm object on success or
748 * an error pointer on failure.
750 * The fence object is looked up and type-checked. The caller needs
751 * to have opened the fence object first, but since that happens on
752 * creation and fence objects aren't shareable, that's not an
755 static struct ttm_base_object *
756 vmw_fence_obj_lookup(struct ttm_object_file *tfile, u32 handle)
758 struct ttm_base_object *base = ttm_base_object_lookup(tfile, handle);
761 pr_err("Invalid fence object handle 0x%08lx.\n",
762 (unsigned long)handle);
763 return ERR_PTR(-EINVAL);
766 if (base->refcount_release != vmw_user_fence_base_release) {
767 pr_err("Invalid fence object handle 0x%08lx.\n",
768 (unsigned long)handle);
769 ttm_base_object_unref(&base);
770 return ERR_PTR(-EINVAL);
777 int vmw_fence_obj_wait_ioctl(struct drm_device *dev, void *data,
778 struct drm_file *file_priv)
780 struct drm_vmw_fence_wait_arg *arg =
781 (struct drm_vmw_fence_wait_arg *)data;
782 unsigned long timeout;
783 struct ttm_base_object *base;
784 struct vmw_fence_obj *fence;
785 struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
787 uint64_t wait_timeout = ((uint64_t)arg->timeout_us * HZ);
790 * 64-bit division not present on 32-bit systems, so do an
791 * approximation. (Divide by 1000000).
794 wait_timeout = (wait_timeout >> 20) + (wait_timeout >> 24) -
795 (wait_timeout >> 26);
797 if (!arg->cookie_valid) {
798 arg->cookie_valid = 1;
799 arg->kernel_cookie = jiffies + wait_timeout;
802 base = vmw_fence_obj_lookup(tfile, arg->handle);
804 return PTR_ERR(base);
806 fence = &(container_of(base, struct vmw_user_fence, base)->fence);
809 if (time_after_eq(timeout, (unsigned long)arg->kernel_cookie)) {
810 ret = ((vmw_fence_obj_signaled(fence)) ?
815 timeout = (unsigned long)arg->kernel_cookie - timeout;
817 ret = vmw_fence_obj_wait(fence, arg->lazy, true, timeout);
820 ttm_base_object_unref(&base);
823 * Optionally unref the fence object.
826 if (ret == 0 && (arg->wait_options & DRM_VMW_WAIT_OPTION_UNREF))
827 return ttm_ref_object_base_unref(tfile, arg->handle,
832 int vmw_fence_obj_signaled_ioctl(struct drm_device *dev, void *data,
833 struct drm_file *file_priv)
835 struct drm_vmw_fence_signaled_arg *arg =
836 (struct drm_vmw_fence_signaled_arg *) data;
837 struct ttm_base_object *base;
838 struct vmw_fence_obj *fence;
839 struct vmw_fence_manager *fman;
840 struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
841 struct vmw_private *dev_priv = vmw_priv(dev);
843 base = vmw_fence_obj_lookup(tfile, arg->handle);
845 return PTR_ERR(base);
847 fence = &(container_of(base, struct vmw_user_fence, base)->fence);
848 fman = fman_from_fence(fence);
850 arg->signaled = vmw_fence_obj_signaled(fence);
852 arg->signaled_flags = arg->flags;
853 spin_lock(&fman->lock);
854 arg->passed_seqno = dev_priv->last_read_seqno;
855 spin_unlock(&fman->lock);
857 ttm_base_object_unref(&base);
863 int vmw_fence_obj_unref_ioctl(struct drm_device *dev, void *data,
864 struct drm_file *file_priv)
866 struct drm_vmw_fence_arg *arg =
867 (struct drm_vmw_fence_arg *) data;
869 return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
875 * vmw_event_fence_action_seq_passed
877 * @action: The struct vmw_fence_action embedded in a struct
878 * vmw_event_fence_action.
880 * This function is called when the seqno of the fence where @action is
881 * attached has passed. It queues the event on the submitter's event list.
882 * This function is always called from atomic context.
884 static void vmw_event_fence_action_seq_passed(struct vmw_fence_action *action)
886 struct vmw_event_fence_action *eaction =
887 container_of(action, struct vmw_event_fence_action, action);
888 struct drm_device *dev = eaction->dev;
889 struct drm_pending_event *event = eaction->event;
890 struct drm_file *file_priv;
893 if (unlikely(event == NULL))
896 file_priv = event->file_priv;
897 spin_lock_irq(&dev->event_lock);
899 if (likely(eaction->tv_sec != NULL)) {
902 do_gettimeofday(&tv);
903 *eaction->tv_sec = tv.tv_sec;
904 *eaction->tv_usec = tv.tv_usec;
907 drm_send_event_locked(dev, eaction->event);
908 eaction->event = NULL;
909 spin_unlock_irq(&dev->event_lock);
913 * vmw_event_fence_action_cleanup
915 * @action: The struct vmw_fence_action embedded in a struct
916 * vmw_event_fence_action.
918 * This function is the struct vmw_fence_action destructor. It's typically
919 * called from a workqueue.
921 static void vmw_event_fence_action_cleanup(struct vmw_fence_action *action)
923 struct vmw_event_fence_action *eaction =
924 container_of(action, struct vmw_event_fence_action, action);
926 vmw_fence_obj_unreference(&eaction->fence);
932 * vmw_fence_obj_add_action - Add an action to a fence object.
934 * @fence - The fence object.
935 * @action - The action to add.
937 * Note that the action callbacks may be executed before this function
940 static void vmw_fence_obj_add_action(struct vmw_fence_obj *fence,
941 struct vmw_fence_action *action)
943 struct vmw_fence_manager *fman = fman_from_fence(fence);
944 bool run_update = false;
946 mutex_lock(&fman->goal_irq_mutex);
947 spin_lock(&fman->lock);
949 fman->pending_actions[action->type]++;
950 if (dma_fence_is_signaled_locked(&fence->base)) {
951 struct list_head action_list;
953 INIT_LIST_HEAD(&action_list);
954 list_add_tail(&action->head, &action_list);
955 vmw_fences_perform_actions(fman, &action_list);
957 list_add_tail(&action->head, &fence->seq_passed_actions);
960 * This function may set fman::seqno_valid, so it must
961 * be run with the goal_irq_mutex held.
963 run_update = vmw_fence_goal_check_locked(fence);
966 spin_unlock(&fman->lock);
969 if (!fman->goal_irq_on) {
970 fman->goal_irq_on = true;
971 vmw_goal_waiter_add(fman->dev_priv);
973 vmw_fences_update(fman);
975 mutex_unlock(&fman->goal_irq_mutex);
980 * vmw_event_fence_action_create - Post an event for sending when a fence
981 * object seqno has passed.
983 * @file_priv: The file connection on which the event should be posted.
984 * @fence: The fence object on which to post the event.
985 * @event: Event to be posted. This event should've been alloced
986 * using k[mz]alloc, and should've been completely initialized.
987 * @interruptible: Interruptible waits if possible.
989 * As a side effect, the object pointed to by @event may have been
990 * freed when this function returns. If this function returns with
991 * an error code, the caller needs to free that object.
994 int vmw_event_fence_action_queue(struct drm_file *file_priv,
995 struct vmw_fence_obj *fence,
996 struct drm_pending_event *event,
1001 struct vmw_event_fence_action *eaction;
1002 struct vmw_fence_manager *fman = fman_from_fence(fence);
1004 eaction = kzalloc(sizeof(*eaction), GFP_KERNEL);
1005 if (unlikely(!eaction))
1008 eaction->event = event;
1010 eaction->action.seq_passed = vmw_event_fence_action_seq_passed;
1011 eaction->action.cleanup = vmw_event_fence_action_cleanup;
1012 eaction->action.type = VMW_ACTION_EVENT;
1014 eaction->fence = vmw_fence_obj_reference(fence);
1015 eaction->dev = fman->dev_priv->dev;
1016 eaction->tv_sec = tv_sec;
1017 eaction->tv_usec = tv_usec;
1019 vmw_fence_obj_add_action(fence, &eaction->action);
1024 struct vmw_event_fence_pending {
1025 struct drm_pending_event base;
1026 struct drm_vmw_event_fence event;
1029 static int vmw_event_fence_action_create(struct drm_file *file_priv,
1030 struct vmw_fence_obj *fence,
1035 struct vmw_event_fence_pending *event;
1036 struct vmw_fence_manager *fman = fman_from_fence(fence);
1037 struct drm_device *dev = fman->dev_priv->dev;
1040 event = kzalloc(sizeof(*event), GFP_KERNEL);
1041 if (unlikely(!event)) {
1042 DRM_ERROR("Failed to allocate an event.\n");
1047 event->event.base.type = DRM_VMW_EVENT_FENCE_SIGNALED;
1048 event->event.base.length = sizeof(*event);
1049 event->event.user_data = user_data;
1051 ret = drm_event_reserve_init(dev, file_priv, &event->base, &event->event.base);
1053 if (unlikely(ret != 0)) {
1054 DRM_ERROR("Failed to allocate event space for this file.\n");
1059 if (flags & DRM_VMW_FE_FLAG_REQ_TIME)
1060 ret = vmw_event_fence_action_queue(file_priv, fence,
1062 &event->event.tv_sec,
1063 &event->event.tv_usec,
1066 ret = vmw_event_fence_action_queue(file_priv, fence,
1077 drm_event_cancel_free(dev, &event->base);
1082 int vmw_fence_event_ioctl(struct drm_device *dev, void *data,
1083 struct drm_file *file_priv)
1085 struct vmw_private *dev_priv = vmw_priv(dev);
1086 struct drm_vmw_fence_event_arg *arg =
1087 (struct drm_vmw_fence_event_arg *) data;
1088 struct vmw_fence_obj *fence = NULL;
1089 struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);
1090 struct ttm_object_file *tfile = vmw_fp->tfile;
1091 struct drm_vmw_fence_rep __user *user_fence_rep =
1092 (struct drm_vmw_fence_rep __user *)(unsigned long)
1098 * Look up an existing fence object,
1099 * and if user-space wants a new reference,
1103 struct ttm_base_object *base =
1104 vmw_fence_obj_lookup(tfile, arg->handle);
1107 return PTR_ERR(base);
1109 fence = &(container_of(base, struct vmw_user_fence,
1111 (void) vmw_fence_obj_reference(fence);
1113 if (user_fence_rep != NULL) {
1114 ret = ttm_ref_object_add(vmw_fp->tfile, base,
1115 TTM_REF_USAGE, NULL, false);
1116 if (unlikely(ret != 0)) {
1117 DRM_ERROR("Failed to reference a fence "
1119 goto out_no_ref_obj;
1121 handle = base->hash.key;
1123 ttm_base_object_unref(&base);
1127 * Create a new fence object.
1130 ret = vmw_execbuf_fence_commands(file_priv, dev_priv,
1134 if (unlikely(ret != 0)) {
1135 DRM_ERROR("Fence event failed to create fence.\n");
1140 BUG_ON(fence == NULL);
1142 ret = vmw_event_fence_action_create(file_priv, fence,
1146 if (unlikely(ret != 0)) {
1147 if (ret != -ERESTARTSYS)
1148 DRM_ERROR("Failed to attach event to fence.\n");
1152 vmw_execbuf_copy_fence_user(dev_priv, vmw_fp, 0, user_fence_rep, fence,
1154 vmw_fence_obj_unreference(&fence);
1157 if (user_fence_rep != NULL)
1158 ttm_ref_object_base_unref(tfile, handle, TTM_REF_USAGE);
1160 vmw_fence_obj_unreference(&fence);