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 // SPDX-License-Identifier: GPL-2.0 OR MIT
 /**************************************************************************
  *
  * Copyright 2011-2014 VMware, Inc., Palo Alto, CA., USA
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
  * without limitation the rights to use, copy, modify, merge, publish,
  * distribute, sub license, and/or sell copies of the Software, and to
  * permit persons to whom the Software is furnished to do so, subject to
  * the following conditions:
  *
  * The above copyright notice and this permission notice (including the
  * next paragraph) shall be included in all copies or substantial portions
  * of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  *
  **************************************************************************/
 
 #include <linux/sched/signal.h>
 
 #include "vmwgfx_drv.h"
 
 #define VMW_FENCE_WRAP (1 << 31)
 
 struct vmw_fence_manager {
     int num_fence_objects;
     struct vmw_private *dev_priv;
     spinlock_t lock;
     struct list_head fence_list;
     struct work_struct work;
     bool fifo_down;
     struct list_head cleanup_list;
     uint32_t pending_actions[VMW_ACTION_MAX];
     struct mutex goal_irq_mutex;
     bool goal_irq_on; /* Protected by @goal_irq_mutex */
     bool seqno_valid; /* Protected by @lock, and may not be set to true
                  without the @goal_irq_mutex held. */
     u64 ctx;
 };
 
 struct vmw_user_fence {
     struct ttm_base_object base;
     struct vmw_fence_obj fence;
 };
 
 /**
  * struct vmw_event_fence_action - fence action that delivers a drm event.
  *
  * @action: A struct vmw_fence_action to hook up to a fence.
  * @event: A pointer to the pending event.
  * @fence: A referenced pointer to the fence to keep it alive while @action
  * hangs on it.
  * @dev: Pointer to a struct drm_device so we can access the event stuff.
  * @tv_sec: If non-null, the variable pointed to will be assigned
  * current time tv_sec val when the fence signals.
  * @tv_usec: Must be set if @tv_sec is set, and the variable pointed to will
  * be assigned the current time tv_usec val when the fence signals.
  */
 struct vmw_event_fence_action {
     struct vmw_fence_action action;
 
     struct drm_pending_event *event;
     struct vmw_fence_obj *fence;
     struct drm_device *dev;
 
     uint32_t *tv_sec;
     uint32_t *tv_usec;
 };
 
 static struct vmw_fence_manager *
 fman_from_fence(struct vmw_fence_obj *fence)
 {
     return container_of(fence->base.lock, struct vmw_fence_manager, lock);
 }
 
 static u32 vmw_fence_goal_read(struct vmw_private *vmw)
 {
     if ((vmw->capabilities2 & SVGA_CAP2_EXTRA_REGS) != 0)
         return vmw_read(vmw, SVGA_REG_FENCE_GOAL);
     else
         return vmw_fifo_mem_read(vmw, SVGA_FIFO_FENCE_GOAL);
 }
 
 static void vmw_fence_goal_write(struct vmw_private *vmw, u32 value)
 {
     if ((vmw->capabilities2 & SVGA_CAP2_EXTRA_REGS) != 0)
         vmw_write(vmw, SVGA_REG_FENCE_GOAL, value);
     else
         vmw_fifo_mem_write(vmw, SVGA_FIFO_FENCE_GOAL, value);
 }
 
 /*
  * Note on fencing subsystem usage of irqs:
  * Typically the vmw_fences_update function is called
  *
  * a) When a new fence seqno has been submitted by the fifo code.
  * b) On-demand when we have waiters. Sleeping waiters will switch on the
  * ANY_FENCE irq and call vmw_fences_update function each time an ANY_FENCE
  * irq is received. When the last fence waiter is gone, that IRQ is masked
  * away.
  *
  * In situations where there are no waiters and we don't submit any new fences,
  * fence objects may not be signaled. This is perfectly OK, since there are
  * no consumers of the signaled data, but that is NOT ok when there are fence
  * actions attached to a fence. The fencing subsystem then makes use of the
  * FENCE_GOAL irq and sets the fence goal seqno to that of the next fence
  * which has an action attached, and each time vmw_fences_update is called,
  * the subsystem makes sure the fence goal seqno is updated.
  *
  * The fence goal seqno irq is on as long as there are unsignaled fence
  * objects with actions attached to them.
  */
 
 static void vmw_fence_obj_destroy(struct dma_fence *f)
 {
     struct vmw_fence_obj *fence =
         container_of(f, struct vmw_fence_obj, base);
 
     struct vmw_fence_manager *fman = fman_from_fence(fence);
 
     spin_lock(&fman->lock);
     list_del_init(&fence->head);
     --fman->num_fence_objects;
     spin_unlock(&fman->lock);
     fence->destroy(fence);
 }
 
 static const char *vmw_fence_get_driver_name(struct dma_fence *f)
 {
     return "vmwgfx";
 }
 
 static const char *vmw_fence_get_timeline_name(struct dma_fence *f)
 {
     return "svga";
 }
 
 static bool vmw_fence_enable_signaling(struct dma_fence *f)
 {
     struct vmw_fence_obj *fence =
         container_of(f, struct vmw_fence_obj, base);
 
     struct vmw_fence_manager *fman = fman_from_fence(fence);
     struct vmw_private *dev_priv = fman->dev_priv;
 
     u32 seqno = vmw_fence_read(dev_priv);
     if (seqno - fence->base.seqno < VMW_FENCE_WRAP)
         return false;
 
     return true;
 }
 
 struct vmwgfx_wait_cb {
     struct dma_fence_cb base;
     struct task_struct *task;
 };
 
 static void
 vmwgfx_wait_cb(struct dma_fence *fence, struct dma_fence_cb *cb)
 {
     struct vmwgfx_wait_cb *wait =
         container_of(cb, struct vmwgfx_wait_cb, base);
 
     wake_up_process(wait->task);
 }
 
 static void __vmw_fences_update(struct vmw_fence_manager *fman);
 
 static long vmw_fence_wait(struct dma_fence *f, bool intr, signed long timeout)
 {
     struct vmw_fence_obj *fence =
         container_of(f, struct vmw_fence_obj, base);
 
     struct vmw_fence_manager *fman = fman_from_fence(fence);
     struct vmw_private *dev_priv = fman->dev_priv;
     struct vmwgfx_wait_cb cb;
     long ret = timeout;
 
     if (likely(vmw_fence_obj_signaled(fence)))
         return timeout;
 
     vmw_seqno_waiter_add(dev_priv);
 
     spin_lock(f->lock);
 
     if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &f->flags))
         goto out;
 
     if (intr && signal_pending(current)) {
         ret = -ERESTARTSYS;
         goto out;
     }
 
     cb.base.func = vmwgfx_wait_cb;
     cb.task = current;
     list_add(&cb.base.node, &f->cb_list);
 
     for (;;) {
         __vmw_fences_update(fman);
 
         /*
          * We can use the barrier free __set_current_state() since
          * DMA_FENCE_FLAG_SIGNALED_BIT + wakeup is protected by the
          * fence spinlock.
          */
         if (intr)
             __set_current_state(TASK_INTERRUPTIBLE);
         else
             __set_current_state(TASK_UNINTERRUPTIBLE);
 
         if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &f->flags)) {
             if (ret == 0 && timeout > 0)
                 ret = 1;
             break;
         }
 
         if (intr && signal_pending(current)) {
             ret = -ERESTARTSYS;
             break;
         }
 
         if (ret == 0)
             break;
 
         spin_unlock(f->lock);
 
         ret = schedule_timeout(ret);
 
         spin_lock(f->lock);
     }
     __set_current_state(TASK_RUNNING);
     if (!list_empty(&cb.base.node))
         list_del(&cb.base.node);
 
 out:
     spin_unlock(f->lock);
 
     vmw_seqno_waiter_remove(dev_priv);
 
     return ret;
 }
 
 static const struct dma_fence_ops vmw_fence_ops = {
     .get_driver_name = vmw_fence_get_driver_name,
     .get_timeline_name = vmw_fence_get_timeline_name,
     .enable_signaling = vmw_fence_enable_signaling,
     .wait = vmw_fence_wait,
     .release = vmw_fence_obj_destroy,
 };
 
 
 /*
  * Execute signal actions on fences recently signaled.
  * This is done from a workqueue so we don't have to execute
  * signal actions from atomic context.
  */
 
 static void vmw_fence_work_func(struct work_struct *work)
 {
     struct vmw_fence_manager *fman =
         container_of(work, struct vmw_fence_manager, work);
     struct list_head list;
     struct vmw_fence_action *action, *next_action;
     bool seqno_valid;
 
     do {
         INIT_LIST_HEAD(&list);
         mutex_lock(&fman->goal_irq_mutex);
 
         spin_lock(&fman->lock);
         list_splice_init(&fman->cleanup_list, &list);
         seqno_valid = fman->seqno_valid;
         spin_unlock(&fman->lock);
 
         if (!seqno_valid && fman->goal_irq_on) {
             fman->goal_irq_on = false;
             vmw_goal_waiter_remove(fman->dev_priv);
         }
         mutex_unlock(&fman->goal_irq_mutex);
 
         if (list_empty(&list))
             return;
 
         /*
          * At this point, only we should be able to manipulate the
          * list heads of the actions we have on the private list.
          * hence fman::lock not held.
          */
 
         list_for_each_entry_safe(action, next_action, &list, head) {
             list_del_init(&action->head);
             if (action->cleanup)
                 action->cleanup(action);
         }
     } while (1);
 }
 
 struct vmw_fence_manager *vmw_fence_manager_init(struct vmw_private *dev_priv)
 {
     struct vmw_fence_manager *fman = kzalloc(sizeof(*fman), GFP_KERNEL);
 
     if (unlikely(!fman))
         return NULL;
 
     fman->dev_priv = dev_priv;
     spin_lock_init(&fman->lock);
     INIT_LIST_HEAD(&fman->fence_list);
     INIT_LIST_HEAD(&fman->cleanup_list);
     INIT_WORK(&fman->work, &vmw_fence_work_func);
     fman->fifo_down = true;
     mutex_init(&fman->goal_irq_mutex);
     fman->ctx = dma_fence_context_alloc(1);
 
     return fman;
 }
 
 void vmw_fence_manager_takedown(struct vmw_fence_manager *fman)
 {
     bool lists_empty;
 
     (void) cancel_work_sync(&fman->work);
 
     spin_lock(&fman->lock);
     lists_empty = list_empty(&fman->fence_list) &&
         list_empty(&fman->cleanup_list);
     spin_unlock(&fman->lock);
 
     BUG_ON(!lists_empty);
     kfree(fman);
 }
 
 static int vmw_fence_obj_init(struct vmw_fence_manager *fman,
                   struct vmw_fence_obj *fence, u32 seqno,
                   void (*destroy) (struct vmw_fence_obj *fence))
 {
     int ret = 0;
 
     dma_fence_init(&fence->base, &vmw_fence_ops, &fman->lock,
                fman->ctx, seqno);
     INIT_LIST_HEAD(&fence->seq_passed_actions);
     fence->destroy = destroy;
 
     spin_lock(&fman->lock);
     if (unlikely(fman->fifo_down)) {
         ret = -EBUSY;
         goto out_unlock;
     }
     list_add_tail(&fence->head, &fman->fence_list);
     ++fman->num_fence_objects;
 
 out_unlock:
     spin_unlock(&fman->lock);
     return ret;
 
 }
 
 static void vmw_fences_perform_actions(struct vmw_fence_manager *fman,
                 struct list_head *list)
 {
     struct vmw_fence_action *action, *next_action;
 
     list_for_each_entry_safe(action, next_action, list, head) {
         list_del_init(&action->head);
         fman->pending_actions[action->type]--;
         if (action->seq_passed != NULL)
             action->seq_passed(action);
 
         /*
          * Add the cleanup action to the cleanup list so that
          * it will be performed by a worker task.
          */
 
         list_add_tail(&action->head, &fman->cleanup_list);
     }
 }
 
 /**
  * vmw_fence_goal_new_locked - Figure out a new device fence goal
  * seqno if needed.
  *
  * @fman: Pointer to a fence manager.
  * @passed_seqno: The seqno the device currently signals as passed.
  *
  * This function should be called with the fence manager lock held.
  * It is typically called when we have a new passed_seqno, and
  * we might need to update the fence goal. It checks to see whether
  * the current fence goal has already passed, and, in that case,
  * scans through all unsignaled fences to get the next fence object with an
  * action attached, and sets the seqno of that fence as a new fence goal.
  *
  * returns true if the device goal seqno was updated. False otherwise.
  */
 static bool vmw_fence_goal_new_locked(struct vmw_fence_manager *fman,
                       u32 passed_seqno)
 {
     u32 goal_seqno;
     struct vmw_fence_obj *fence;
 
     if (likely(!fman->seqno_valid))
         return false;
 
     goal_seqno = vmw_fence_goal_read(fman->dev_priv);
     if (likely(passed_seqno - goal_seqno >= VMW_FENCE_WRAP))
         return false;
 
     fman->seqno_valid = false;
     list_for_each_entry(fence, &fman->fence_list, head) {
         if (!list_empty(&fence->seq_passed_actions)) {
             fman->seqno_valid = true;
             vmw_fence_goal_write(fman->dev_priv,
                          fence->base.seqno);
             break;
         }
     }
 
     return true;
 }
 
 
 /**
  * vmw_fence_goal_check_locked - Replace the device fence goal seqno if
  * needed.
  *
  * @fence: Pointer to a struct vmw_fence_obj the seqno of which should be
  * considered as a device fence goal.
  *
  * This function should be called with the fence manager lock held.
  * It is typically called when an action has been attached to a fence to
  * check whether the seqno of that fence should be used for a fence
  * goal interrupt. This is typically needed if the current fence goal is
  * invalid, or has a higher seqno than that of the current fence object.
  *
  * returns true if the device goal seqno was updated. False otherwise.
  */
 static bool vmw_fence_goal_check_locked(struct vmw_fence_obj *fence)
 {
     struct vmw_fence_manager *fman = fman_from_fence(fence);
     u32 goal_seqno;
 
     if (dma_fence_is_signaled_locked(&fence->base))
         return false;
 
     goal_seqno = vmw_fence_goal_read(fman->dev_priv);
     if (likely(fman->seqno_valid &&
            goal_seqno - fence->base.seqno < VMW_FENCE_WRAP))
         return false;
 
     vmw_fence_goal_write(fman->dev_priv, fence->base.seqno);
     fman->seqno_valid = true;
 
     return true;
 }
 
 static void __vmw_fences_update(struct vmw_fence_manager *fman)
 {
     struct vmw_fence_obj *fence, *next_fence;
     struct list_head action_list;
     bool needs_rerun;
     uint32_t seqno, new_seqno;
 
     seqno = vmw_fence_read(fman->dev_priv);
 rerun:
     list_for_each_entry_safe(fence, next_fence, &fman->fence_list, head) {
         if (seqno - fence->base.seqno < VMW_FENCE_WRAP) {
             list_del_init(&fence->head);
             dma_fence_signal_locked(&fence->base);
             INIT_LIST_HEAD(&action_list);
             list_splice_init(&fence->seq_passed_actions,
                      &action_list);
             vmw_fences_perform_actions(fman, &action_list);
         } else
             break;
     }
 
     /*
      * Rerun if the fence goal seqno was updated, and the
      * hardware might have raced with that update, so that
      * we missed a fence_goal irq.
      */
 
     needs_rerun = vmw_fence_goal_new_locked(fman, seqno);
     if (unlikely(needs_rerun)) {
         new_seqno = vmw_fence_read(fman->dev_priv);
         if (new_seqno != seqno) {
             seqno = new_seqno;
             goto rerun;
         }
     }
 
     if (!list_empty(&fman->cleanup_list))
         (void) schedule_work(&fman->work);
 }
 
 void vmw_fences_update(struct vmw_fence_manager *fman)
 {
     spin_lock(&fman->lock);
     __vmw_fences_update(fman);
     spin_unlock(&fman->lock);
 }
 
 bool vmw_fence_obj_signaled(struct vmw_fence_obj *fence)
 {
     struct vmw_fence_manager *fman = fman_from_fence(fence);
 
     if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))
         return true;
 
     vmw_fences_update(fman);
 
     return dma_fence_is_signaled(&fence->base);
 }
 
 int vmw_fence_obj_wait(struct vmw_fence_obj *fence, bool lazy,
                bool interruptible, unsigned long timeout)
 {
     long ret = dma_fence_wait_timeout(&fence->base, interruptible, timeout);
 
     if (likely(ret > 0))
         return 0;
     else if (ret == 0)
         return -EBUSY;
     else
         return ret;
 }
 
 static void vmw_fence_destroy(struct vmw_fence_obj *fence)
 {
     dma_fence_free(&fence->base);
 }
 
 int vmw_fence_create(struct vmw_fence_manager *fman,
              uint32_t seqno,
              struct vmw_fence_obj **p_fence)
 {
     struct vmw_fence_obj *fence;
     int ret;
 
     fence = kzalloc(sizeof(*fence), GFP_KERNEL);
     if (unlikely(!fence))
         return -ENOMEM;
 
     ret = vmw_fence_obj_init(fman, fence, seqno,
                  vmw_fence_destroy);
     if (unlikely(ret != 0))
         goto out_err_init;
 
     *p_fence = fence;
     return 0;
 
 out_err_init:
     kfree(fence);
     return ret;
 }
 
 
 static void vmw_user_fence_destroy(struct vmw_fence_obj *fence)
 {
     struct vmw_user_fence *ufence =
         container_of(fence, struct vmw_user_fence, fence);
 
     ttm_base_object_kfree(ufence, base);
 }
 
 static void vmw_user_fence_base_release(struct ttm_base_object **p_base)
 {
     struct ttm_base_object *base = *p_base;
     struct vmw_user_fence *ufence =
         container_of(base, struct vmw_user_fence, base);
     struct vmw_fence_obj *fence = &ufence->fence;
 
     *p_base = NULL;
     vmw_fence_obj_unreference(&fence);
 }
 
 int vmw_user_fence_create(struct drm_file *file_priv,
               struct vmw_fence_manager *fman,
               uint32_t seqno,
               struct vmw_fence_obj **p_fence,
               uint32_t *p_handle)
 {
     struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
     struct vmw_user_fence *ufence;
     struct vmw_fence_obj *tmp;
     int ret;
 
     ufence = kzalloc(sizeof(*ufence), GFP_KERNEL);
     if (unlikely(!ufence)) {
         ret = -ENOMEM;
         goto out_no_object;
     }
 
     ret = vmw_fence_obj_init(fman, &ufence->fence, seqno,
                  vmw_user_fence_destroy);
     if (unlikely(ret != 0)) {
         kfree(ufence);
         goto out_no_object;
     }
 
     /*
      * The base object holds a reference which is freed in
      * vmw_user_fence_base_release.
      */
     tmp = vmw_fence_obj_reference(&ufence->fence);
 
     ret = ttm_base_object_init(tfile, &ufence->base, false,
                    VMW_RES_FENCE,
                    &vmw_user_fence_base_release);
 
 
     if (unlikely(ret != 0)) {
         /*
          * Free the base object's reference
          */
         vmw_fence_obj_unreference(&tmp);
         goto out_err;
     }
 
     *p_fence = &ufence->fence;
     *p_handle = ufence->base.handle;
 
     return 0;
 out_err:
     tmp = &ufence->fence;
     vmw_fence_obj_unreference(&tmp);
 out_no_object:
     return ret;
 }
 
 /*
  * vmw_fence_fifo_down - signal all unsignaled fence objects.
  */
 
 void vmw_fence_fifo_down(struct vmw_fence_manager *fman)
 {
     struct list_head action_list;
     int ret;
 
     /*
      * The list may be altered while we traverse it, so always
      * restart when we've released the fman->lock.
      */
 
     spin_lock(&fman->lock);
     fman->fifo_down = true;
     while (!list_empty(&fman->fence_list)) {
         struct vmw_fence_obj *fence =
             list_entry(fman->fence_list.prev, struct vmw_fence_obj,
                    head);
         dma_fence_get(&fence->base);
         spin_unlock(&fman->lock);
 
         ret = vmw_fence_obj_wait(fence, false, false,
                      VMW_FENCE_WAIT_TIMEOUT);
 
         if (unlikely(ret != 0)) {
             list_del_init(&fence->head);
             dma_fence_signal(&fence->base);
             INIT_LIST_HEAD(&action_list);
             list_splice_init(&fence->seq_passed_actions,
                      &action_list);
             vmw_fences_perform_actions(fman, &action_list);
         }
 
         BUG_ON(!list_empty(&fence->head));
         dma_fence_put(&fence->base);
         spin_lock(&fman->lock);
     }
     spin_unlock(&fman->lock);
 }
 
 void vmw_fence_fifo_up(struct vmw_fence_manager *fman)
 {
     spin_lock(&fman->lock);
     fman->fifo_down = false;
     spin_unlock(&fman->lock);
 }
 
 
 /**
  * vmw_fence_obj_lookup - Look up a user-space fence object
  *
  * @tfile: A struct ttm_object_file identifying the caller.
  * @handle: A handle identifying the fence object.
  * @return: A struct vmw_user_fence base ttm object on success or
  * an error pointer on failure.
  *
  * The fence object is looked up and type-checked. The caller needs
  * to have opened the fence object first, but since that happens on
  * creation and fence objects aren't shareable, that's not an
  * issue currently.
  */
 static struct ttm_base_object *
 vmw_fence_obj_lookup(struct ttm_object_file *tfile, u32 handle)
 {
     struct ttm_base_object *base = ttm_base_object_lookup(tfile, handle);
 
     if (!base) {
         pr_err("Invalid fence object handle 0x%08lx.\n",
                (unsigned long)handle);
         return ERR_PTR(-EINVAL);
     }
 
     if (base->refcount_release != vmw_user_fence_base_release) {
         pr_err("Invalid fence object handle 0x%08lx.\n",
                (unsigned long)handle);
         ttm_base_object_unref(&base);
         return ERR_PTR(-EINVAL);
     }
 
     return base;
 }
 
 
 int vmw_fence_obj_wait_ioctl(struct drm_device *dev, void *data,
                  struct drm_file *file_priv)
 {
     struct drm_vmw_fence_wait_arg *arg =
         (struct drm_vmw_fence_wait_arg *)data;
     unsigned long timeout;
     struct ttm_base_object *base;
     struct vmw_fence_obj *fence;
     struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
     int ret;
     uint64_t wait_timeout = ((uint64_t)arg->timeout_us * HZ);
 
     /*
      * 64-bit division not present on 32-bit systems, so do an
      * approximation. (Divide by 1000000).
      */
 
     wait_timeout = (wait_timeout >> 20) + (wait_timeout >> 24) -
       (wait_timeout >> 26);
 
     if (!arg->cookie_valid) {
         arg->cookie_valid = 1;
         arg->kernel_cookie = jiffies + wait_timeout;
     }
 
     base = vmw_fence_obj_lookup(tfile, arg->handle);
     if (IS_ERR(base))
         return PTR_ERR(base);
 
     fence = &(container_of(base, struct vmw_user_fence, base)->fence);
 
     timeout = jiffies;
     if (time_after_eq(timeout, (unsigned long)arg->kernel_cookie)) {
         ret = ((vmw_fence_obj_signaled(fence)) ?
                0 : -EBUSY);
         goto out;
     }
 
     timeout = (unsigned long)arg->kernel_cookie - timeout;
 
     ret = vmw_fence_obj_wait(fence, arg->lazy, true, timeout);
 
 out:
     ttm_base_object_unref(&base);
 
     /*
      * Optionally unref the fence object.
      */
 
     if (ret == 0 && (arg->wait_options & DRM_VMW_WAIT_OPTION_UNREF))
         return ttm_ref_object_base_unref(tfile, arg->handle);
     return ret;
 }
 
 int vmw_fence_obj_signaled_ioctl(struct drm_device *dev, void *data,
                  struct drm_file *file_priv)
 {
     struct drm_vmw_fence_signaled_arg *arg =
         (struct drm_vmw_fence_signaled_arg *) data;
     struct ttm_base_object *base;
     struct vmw_fence_obj *fence;
     struct vmw_fence_manager *fman;
     struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
     struct vmw_private *dev_priv = vmw_priv(dev);
 
     base = vmw_fence_obj_lookup(tfile, arg->handle);
     if (IS_ERR(base))
         return PTR_ERR(base);
 
     fence = &(container_of(base, struct vmw_user_fence, base)->fence);
     fman = fman_from_fence(fence);
 
     arg->signaled = vmw_fence_obj_signaled(fence);
 
     arg->signaled_flags = arg->flags;
     spin_lock(&fman->lock);
     arg->passed_seqno = dev_priv->last_read_seqno;
     spin_unlock(&fman->lock);
 
     ttm_base_object_unref(&base);
 
     return 0;
 }
 
 
 int vmw_fence_obj_unref_ioctl(struct drm_device *dev, void *data,
                   struct drm_file *file_priv)
 {
     struct drm_vmw_fence_arg *arg =
         (struct drm_vmw_fence_arg *) data;
 
     return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
                      arg->handle);
 }
 
 /**
  * vmw_event_fence_action_seq_passed
  *
  * @action: The struct vmw_fence_action embedded in a struct
  * vmw_event_fence_action.
  *
  * This function is called when the seqno of the fence where @action is
  * attached has passed. It queues the event on the submitter's event list.
  * This function is always called from atomic context.
  */
 static void vmw_event_fence_action_seq_passed(struct vmw_fence_action *action)
 {
     struct vmw_event_fence_action *eaction =
         container_of(action, struct vmw_event_fence_action, action);
     struct drm_device *dev = eaction->dev;
     struct drm_pending_event *event = eaction->event;
 
     if (unlikely(event == NULL))
         return;
 
     spin_lock_irq(&dev->event_lock);
 
     if (likely(eaction->tv_sec != NULL)) {
         struct timespec64 ts;
 
         ktime_get_ts64(&ts);
         /* monotonic time, so no y2038 overflow */
         *eaction->tv_sec = ts.tv_sec;
         *eaction->tv_usec = ts.tv_nsec / NSEC_PER_USEC;
     }
 
     drm_send_event_locked(dev, eaction->event);
     eaction->event = NULL;
     spin_unlock_irq(&dev->event_lock);
 }
 
 /**
  * vmw_event_fence_action_cleanup
  *
  * @action: The struct vmw_fence_action embedded in a struct
  * vmw_event_fence_action.
  *
  * This function is the struct vmw_fence_action destructor. It's typically
  * called from a workqueue.
  */
 static void vmw_event_fence_action_cleanup(struct vmw_fence_action *action)
 {
     struct vmw_event_fence_action *eaction =
         container_of(action, struct vmw_event_fence_action, action);
 
     vmw_fence_obj_unreference(&eaction->fence);
     kfree(eaction);
 }
 
 
 /**
  * vmw_fence_obj_add_action - Add an action to a fence object.
  *
  * @fence: The fence object.
  * @action: The action to add.
  *
  * Note that the action callbacks may be executed before this function
  * returns.
  */
 static void vmw_fence_obj_add_action(struct vmw_fence_obj *fence,
                   struct vmw_fence_action *action)
 {
     struct vmw_fence_manager *fman = fman_from_fence(fence);
     bool run_update = false;
 
     mutex_lock(&fman->goal_irq_mutex);
     spin_lock(&fman->lock);
 
     fman->pending_actions[action->type]++;
     if (dma_fence_is_signaled_locked(&fence->base)) {
         struct list_head action_list;
 
         INIT_LIST_HEAD(&action_list);
         list_add_tail(&action->head, &action_list);
         vmw_fences_perform_actions(fman, &action_list);
     } else {
         list_add_tail(&action->head, &fence->seq_passed_actions);
 
         /*
          * This function may set fman::seqno_valid, so it must
          * be run with the goal_irq_mutex held.
          */
         run_update = vmw_fence_goal_check_locked(fence);
     }
 
     spin_unlock(&fman->lock);
 
     if (run_update) {
         if (!fman->goal_irq_on) {
             fman->goal_irq_on = true;
             vmw_goal_waiter_add(fman->dev_priv);
         }
         vmw_fences_update(fman);
     }
     mutex_unlock(&fman->goal_irq_mutex);
 
 }
 
 /**
  * vmw_event_fence_action_queue - Post an event for sending when a fence
  * object seqno has passed.
  *
  * @file_priv: The file connection on which the event should be posted.
  * @fence: The fence object on which to post the event.
  * @event: Event to be posted. This event should've been alloced
  * using k[mz]alloc, and should've been completely initialized.
  * @tv_sec: If non-null, the variable pointed to will be assigned
  * current time tv_sec val when the fence signals.
  * @tv_usec: Must be set if @tv_sec is set, and the variable pointed to will
  * be assigned the current time tv_usec val when the fence signals.
  * @interruptible: Interruptible waits if possible.
  *
  * As a side effect, the object pointed to by @event may have been
  * freed when this function returns. If this function returns with
  * an error code, the caller needs to free that object.
  */
 
 int vmw_event_fence_action_queue(struct drm_file *file_priv,
                  struct vmw_fence_obj *fence,
                  struct drm_pending_event *event,
                  uint32_t *tv_sec,
                  uint32_t *tv_usec,
                  bool interruptible)
 {
     struct vmw_event_fence_action *eaction;
     struct vmw_fence_manager *fman = fman_from_fence(fence);
 
     eaction = kzalloc(sizeof(*eaction), GFP_KERNEL);
     if (unlikely(!eaction))
         return -ENOMEM;
 
     eaction->event = event;
 
     eaction->action.seq_passed = vmw_event_fence_action_seq_passed;
     eaction->action.cleanup = vmw_event_fence_action_cleanup;
     eaction->action.type = VMW_ACTION_EVENT;
 
     eaction->fence = vmw_fence_obj_reference(fence);
     eaction->dev = &fman->dev_priv->drm;
     eaction->tv_sec = tv_sec;
     eaction->tv_usec = tv_usec;
 
     vmw_fence_obj_add_action(fence, &eaction->action);
 
     return 0;
 }
 
 struct vmw_event_fence_pending {
     struct drm_pending_event base;
     struct drm_vmw_event_fence event;
 };
 
 static int vmw_event_fence_action_create(struct drm_file *file_priv,
                   struct vmw_fence_obj *fence,
                   uint32_t flags,
                   uint64_t user_data,
                   bool interruptible)
 {
     struct vmw_event_fence_pending *event;
     struct vmw_fence_manager *fman = fman_from_fence(fence);
     struct drm_device *dev = &fman->dev_priv->drm;
     int ret;
 
     event = kzalloc(sizeof(*event), GFP_KERNEL);
     if (unlikely(!event)) {
         DRM_ERROR("Failed to allocate an event.\n");
         ret = -ENOMEM;
         goto out_no_space;
     }
 
     event->event.base.type = DRM_VMW_EVENT_FENCE_SIGNALED;
     event->event.base.length = sizeof(*event);
     event->event.user_data = user_data;
 
     ret = drm_event_reserve_init(dev, file_priv, &event->base, &event->event.base);
 
     if (unlikely(ret != 0)) {
         DRM_ERROR("Failed to allocate event space for this file.\n");
         kfree(event);
         goto out_no_space;
     }
 
     if (flags & DRM_VMW_FE_FLAG_REQ_TIME)
         ret = vmw_event_fence_action_queue(file_priv, fence,
                            &event->base,
                            &event->event.tv_sec,
                            &event->event.tv_usec,
                            interruptible);
     else
         ret = vmw_event_fence_action_queue(file_priv, fence,
                            &event->base,
                            NULL,
                            NULL,
                            interruptible);
     if (ret != 0)
         goto out_no_queue;
 
     return 0;
 
 out_no_queue:
     drm_event_cancel_free(dev, &event->base);
 out_no_space:
     return ret;
 }
 
 int vmw_fence_event_ioctl(struct drm_device *dev, void *data,
               struct drm_file *file_priv)
 {
     struct vmw_private *dev_priv = vmw_priv(dev);
     struct drm_vmw_fence_event_arg *arg =
         (struct drm_vmw_fence_event_arg *) data;
     struct vmw_fence_obj *fence = NULL;
     struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);
     struct ttm_object_file *tfile = vmw_fp->tfile;
     struct drm_vmw_fence_rep __user *user_fence_rep =
         (struct drm_vmw_fence_rep __user *)(unsigned long)
         arg->fence_rep;
     uint32_t handle;
     int ret;
 
     /*
      * Look up an existing fence object,
      * and if user-space wants a new reference,
      * add one.
      */
     if (arg->handle) {
         struct ttm_base_object *base =
             vmw_fence_obj_lookup(tfile, arg->handle);
 
         if (IS_ERR(base))
             return PTR_ERR(base);
 
         fence = &(container_of(base, struct vmw_user_fence,
                        base)->fence);
         (void) vmw_fence_obj_reference(fence);
 
         if (user_fence_rep != NULL) {
             ret = ttm_ref_object_add(vmw_fp->tfile, base,
                          NULL, false);
             if (unlikely(ret != 0)) {
                 DRM_ERROR("Failed to reference a fence "
                       "object.\n");
                 goto out_no_ref_obj;
             }
             handle = base->handle;
         }
         ttm_base_object_unref(&base);
     }
 
     /*
      * Create a new fence object.
      */
     if (!fence) {
         ret = vmw_execbuf_fence_commands(file_priv, dev_priv,
                          &fence,
                          (user_fence_rep) ?
                          &handle : NULL);
         if (unlikely(ret != 0)) {
             DRM_ERROR("Fence event failed to create fence.\n");
             return ret;
         }
     }
 
     BUG_ON(fence == NULL);
 
     ret = vmw_event_fence_action_create(file_priv, fence,
                         arg->flags,
                         arg->user_data,
                         true);
     if (unlikely(ret != 0)) {
         if (ret != -ERESTARTSYS)
             DRM_ERROR("Failed to attach event to fence.\n");
         goto out_no_create;
     }
 
     vmw_execbuf_copy_fence_user(dev_priv, vmw_fp, 0, user_fence_rep, fence,
                     handle, -1);
     vmw_fence_obj_unreference(&fence);
     return 0;
 out_no_create:
     if (user_fence_rep != NULL)
         ttm_ref_object_base_unref(tfile, handle);
 out_no_ref_obj:
     vmw_fence_obj_unreference(&fence);
     return ret;
 }

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