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/**************************************************************************

 *

 * Copyright © 2011-2014 VMware, Inc., Palo Alto, CA., USA

 * All Rights Reserved.

 *

 * 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 

#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;

	u32 user_fence_size;

	u32 fence_size;

	u32 event_fence_action_size;

	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. */

	unsigned 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.

 *

 * @e: A struct drm_pending_event that controls the event delivery.

 * @action: A struct vmw_fence_action to hook up to a fence.

 * @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.

 * @kref: Both @e and @action has destructors, so we need to refcount.

 * @size: Size accounted for this object.

 * @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 list_head fpriv_head;

	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);

}

/**

 * 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 fence *f)

{

	struct vmw_fence_obj *fence =

		container_of(f, struct vmw_fence_obj, base);

	struct vmw_fence_manager *fman = fman_from_fence(fence);

	unsigned long irq_flags;

	spin_lock_irqsave(&fman->lock, irq_flags);

	list_del_init(&fence->head);

	--fman->num_fence_objects;

	spin_unlock_irqrestore(&fman->lock, irq_flags);

	fence->destroy(fence);

}

static const char *vmw_fence_get_driver_name(struct fence *f)

{

	return "vmwgfx";

}

static const char *vmw_fence_get_timeline_name(struct fence *f)

{

	return "svga";

}

static bool vmw_fence_enable_signaling(struct 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 *fifo_mem = dev_priv->mmio_virt;

	u32 seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);

	if (seqno - fence->base.seqno < VMW_FENCE_WRAP)

		return false;

	vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);

	return true;

}

struct vmwgfx_wait_cb {

	struct fence_cb base;

	struct task_struct *task;

};

static void

vmwgfx_wait_cb(struct fence *fence, struct 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 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;

	unsigned long irq_flags;

	if (likely(vmw_fence_obj_signaled(fence)))

		return timeout;

	vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);

	vmw_seqno_waiter_add(dev_priv);

	spin_lock_irqsave(f->lock, irq_flags);

//   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);

	while (ret > 0) {

		__vmw_fences_update(fman);

		if (test_bit(FENCE_FLAG_SIGNALED_BIT, &f->flags))

			break;

		spin_unlock_irqrestore(f->lock, irq_flags);

//		ret = schedule_timeout(ret);

		delay(1);

		ret = 0;

		spin_lock_irqsave(f->lock, irq_flags);

//       if (ret > 0 && intr && signal_pending(current))

//           ret = -ERESTARTSYS;

	}

	if (!list_empty(&cb.base.node))

		list_del(&cb.base.node);

out:

	spin_unlock_irqrestore(f->lock, irq_flags);

	vmw_seqno_waiter_remove(dev_priv);

	return ret;

}

static struct 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_irq(&fman->lock);

		list_splice_init(&fman->cleanup_list, &list);

		seqno_valid = fman->seqno_valid;

		spin_unlock_irq(&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 == NULL))

		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;

	fman->user_fence_size = ttm_round_pot(sizeof(struct vmw_user_fence));

	fman->fence_size = ttm_round_pot(sizeof(struct vmw_fence_obj));

	fman->event_fence_action_size =

		ttm_round_pot(sizeof(struct vmw_event_fence_action));

	mutex_init(&fman->goal_irq_mutex);

	fman->ctx = fence_context_alloc(1);

	return fman;

}

void vmw_fence_manager_takedown(struct vmw_fence_manager *fman)

{

	unsigned long irq_flags;

	bool lists_empty;

 //  (void) cancel_work_sync(&fman->work);

	spin_lock_irqsave(&fman->lock, irq_flags);

	lists_empty = list_empty(&fman->fence_list) &&

		list_empty(&fman->cleanup_list);

	spin_unlock_irqrestore(&fman->lock, irq_flags);

	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))

{

	unsigned long irq_flags;

	int ret = 0;

	fence_init(&fence->base, &vmw_fence_ops, &fman->lock,

		   fman->ctx, seqno);

	INIT_LIST_HEAD(&fence->seq_passed_actions);

	fence->destroy = destroy;

	spin_lock_irqsave(&fman->lock, irq_flags);

	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_irqrestore(&fman->lock, irq_flags);

	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;

	u32 *fifo_mem;

	struct vmw_fence_obj *fence;

	if (likely(!fman->seqno_valid))

		return false;

	fifo_mem = fman->dev_priv->mmio_virt;

	goal_seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE_GOAL);

	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_mmio_write(fence->base.seqno,

				       fifo_mem + SVGA_FIFO_FENCE_GOAL);

			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;

	u32 *fifo_mem;

	if (fence_is_signaled_locked(&fence->base))

		return false;

	fifo_mem = fman->dev_priv->mmio_virt;

	goal_seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE_GOAL);

	if (likely(fman->seqno_valid &&

		   goal_seqno - fence->base.seqno < VMW_FENCE_WRAP))

		return false;

	vmw_mmio_write(fence->base.seqno, fifo_mem + SVGA_FIFO_FENCE_GOAL);

	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;

	u32 *fifo_mem = fman->dev_priv->mmio_virt;

	seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);

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);

			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_mmio_read(fifo_mem + SVGA_FIFO_FENCE);

		if (new_seqno != seqno) {

			seqno = new_seqno;

			goto rerun;

		}

	}

}

void vmw_fences_update(struct vmw_fence_manager *fman)

{

	unsigned long irq_flags;

	spin_lock_irqsave(&fman->lock, irq_flags);

	__vmw_fences_update(fman);

	spin_unlock_irqrestore(&fman->lock, irq_flags);

}

bool vmw_fence_obj_signaled(struct vmw_fence_obj *fence)

{

	struct vmw_fence_manager *fman = fman_from_fence(fence);

	if (test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))

		return 1;

	vmw_fences_update(fman);

	return fence_is_signaled(&fence->base);

}

int vmw_fence_obj_wait(struct vmw_fence_obj *fence, bool lazy,

		       bool interruptible, unsigned long timeout)

{

	long ret = fence_wait_timeout(&fence->base, interruptible, timeout);

	if (likely(ret > 0))

		return 0;

	else if (ret == 0)

		return -EBUSY;

	else

		return ret;

}

void vmw_fence_obj_flush(struct vmw_fence_obj *fence)

{

	struct vmw_private *dev_priv = fman_from_fence(fence)->dev_priv;

	vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);

}

static void vmw_fence_destroy(struct vmw_fence_obj *fence)

{

	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 == NULL))

		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);

	struct vmw_fence_manager *fman = fman_from_fence(fence);

	ttm_base_object_kfree(ufence, base);

	/*

	 * Free kernel space accounting.

	 */

	ttm_mem_global_free(vmw_mem_glob(fman->dev_priv),

			    fman->user_fence_size);

}

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;

	struct ttm_mem_global *mem_glob = vmw_mem_glob(fman->dev_priv);

	int ret;

	/*

	 * Kernel memory space accounting, since this object may

	 * be created by a user-space request.

	 */

	ret = ttm_mem_global_alloc(mem_glob, fman->user_fence_size,

				   false, false);

	if (unlikely(ret != 0))

		return ret;

	ufence = kzalloc(sizeof(*ufence), GFP_KERNEL);

	if (unlikely(ufence == NULL)) {

		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, NULL);

	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.hash.key;

	return 0;

out_err:

	tmp = &ufence->fence;

	vmw_fence_obj_unreference(&tmp);

out_no_object:

	ttm_mem_global_free(mem_glob, fman->user_fence_size);

	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_irq(&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);

		fence_get(&fence->base);

		spin_unlock_irq(&fman->lock);

		ret = vmw_fence_obj_wait(fence, false, false,

					 VMW_FENCE_WAIT_TIMEOUT);

		if (unlikely(ret != 0)) {

			list_del_init(&fence->head);

			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));

		fence_put(&fence->base);

		spin_lock_irq(&fman->lock);

	}

	spin_unlock_irq(&fman->lock);

}

void vmw_fence_fifo_up(struct vmw_fence_manager *fman)

{

	unsigned long irq_flags;

	spin_lock_irqsave(&fman->lock, irq_flags);

	fman->fifo_down = false;

	spin_unlock_irqrestore(&fman->lock, irq_flags);

}

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 = ttm_base_object_lookup(tfile, arg->handle);

	if (unlikely(base == NULL)) {

		printk(KERN_ERR "Wait invalid fence object handle "

		       "0x%08lx.\n",

		       (unsigned long)arg->handle);

		return -EINVAL;

	}

	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)) ?

		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,

						 TTM_REF_USAGE);

	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 = ttm_base_object_lookup(tfile, arg->handle);

	if (unlikely(base == NULL)) {

		printk(KERN_ERR "Fence signaled invalid fence object handle "

		       "0x%08lx.\n",

		       (unsigned long)arg->handle);

		return -EINVAL;

	}

	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_irq(&fman->lock);

	arg->passed_seqno = dev_priv->last_read_seqno;

	spin_unlock_irq(&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,

					 TTM_REF_USAGE);

}

/**

 * vmw_event_fence_fpriv_gone - Remove references to struct drm_file objects

 *

 * @fman: Pointer to a struct vmw_fence_manager

 * @event_list: Pointer to linked list of struct vmw_event_fence_action objects

 * with pointers to a struct drm_file object about to be closed.

 *

 * This function removes all pending fence events with references to a

 * specific struct drm_file object about to be closed. The caller is required

 * to pass a list of all struct vmw_event_fence_action objects with such

 * events attached. This function is typically called before the

 * struct drm_file object's event management is taken down.

 */

void vmw_event_fence_fpriv_gone(struct vmw_fence_manager *fman,

				struct list_head *event_list)

{

	struct vmw_event_fence_action *eaction;

	struct drm_pending_event *event;

	unsigned long irq_flags;

	while (1) {

		spin_lock_irqsave(&fman->lock, irq_flags);

		if (list_empty(event_list))

			goto out_unlock;

		eaction = list_first_entry(event_list,

					   struct vmw_event_fence_action,

					   fpriv_head);

		list_del_init(&eaction->fpriv_head);

		event = eaction->event;

		eaction->event = NULL;

		spin_unlock_irqrestore(&fman->lock, irq_flags);

		event->destroy(event);

	}

out_unlock:

	spin_unlock_irqrestore(&fman->lock, irq_flags);

}

/**

 * 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, and may be called

 * from irq 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;

	struct drm_file *file_priv;

	unsigned long irq_flags;

	if (unlikely(event == NULL))

		return;

	file_priv = event->file_priv;

	spin_lock_irqsave(&dev->event_lock, irq_flags);

	if (likely(eaction->tv_sec != NULL)) {

		struct timeval tv;

//       do_gettimeofday(&tv);

		*eaction->tv_sec = tv.tv_sec;

		*eaction->tv_usec = tv.tv_usec;

	}

	list_del_init(&eaction->fpriv_head);

	list_add_tail(&eaction->event->link, &file_priv->event_list);

	eaction->event = NULL;

	wake_up_all(&file_priv->event_wait);

	spin_unlock_irqrestore(&dev->event_lock, irq_flags);

}

/**

 * 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);

	struct vmw_fence_manager *fman = fman_from_fence(eaction->fence);

	unsigned long irq_flags;

	spin_lock_irqsave(&fman->lock, irq_flags);

	list_del(&eaction->fpriv_head);

	spin_unlock_irqrestore(&fman->lock, irq_flags);

	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);

	unsigned long irq_flags;

	bool run_update = false;

	mutex_lock(&fman->goal_irq_mutex);

	spin_lock_irqsave(&fman->lock, irq_flags);

	fman->pending_actions[action->type]++;

	if (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_irqrestore(&fman->lock, irq_flags);

	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_create - 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.

 * @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);

	struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);

	unsigned long irq_flags;

	eaction = kzalloc(sizeof(*eaction), GFP_KERNEL);

	if (unlikely(eaction == NULL))

		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->dev;

	eaction->tv_sec = tv_sec;

	eaction->tv_usec = tv_usec;

	spin_lock_irqsave(&fman->lock, irq_flags);

	list_add_tail(&eaction->fpriv_head, &vmw_fp->fence_events);

	spin_unlock_irqrestore(&fman->lock, irq_flags);

	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->dev;

	unsigned long irq_flags;

	int ret;

	spin_lock_irqsave(&dev->event_lock, irq_flags);

	ret = (file_priv->event_space < sizeof(event->event)) ? -EBUSY : 0;

	if (likely(ret == 0))

		file_priv->event_space -= sizeof(event->event);

	spin_unlock_irqrestore(&dev->event_lock, irq_flags);

	if (unlikely(ret != 0)) {

		DRM_ERROR("Failed to allocate event space for this file.\n");

		goto out_no_space;

	}

	event = kzalloc(sizeof(*event), GFP_KERNEL);

	if (unlikely(event == NULL)) {

		DRM_ERROR("Failed to allocate an event.\n");

		ret = -ENOMEM;

		goto out_no_event;

	}

	event->event.base.type = DRM_VMW_EVENT_FENCE_SIGNALED;

	event->event.base.length = sizeof(*event);

	event->event.user_data = user_data;

	event->base.event = &event->event.base;

	event->base.file_priv = file_priv;

	event->base.destroy = (void (*) (struct drm_pending_event *)) kfree;

	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:

	event->base.destroy(&event->base);

out_no_event:

	spin_lock_irqsave(&dev->event_lock, irq_flags);

	file_priv->event_space += sizeof(*event);

	spin_unlock_irqrestore(&dev->event_lock, irq_flags);

out_no_space:

	return ret;

}

#if 0

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 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 =

			ttm_base_object_lookup_for_ref(dev_priv->tdev,

						       arg->handle);

		if (unlikely(base == NULL)) {

			DRM_ERROR("Fence event invalid fence object handle "