vmwgfx_fence.c 30.9 KB
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/**************************************************************************
 *
 * Copyright © 2011 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.
 *
 **************************************************************************/

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#include <drm/drmP.h>
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#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;
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	u32 event_fence_action_size;
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	bool fifo_down;
	struct list_head cleanup_list;
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	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. */
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};

struct vmw_user_fence {
	struct ttm_base_object base;
	struct vmw_fence_obj fence;
};

/**
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 * struct vmw_event_fence_action - fence action that delivers a drm event.
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 *
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 * @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;
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	struct list_head fpriv_head;
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	struct drm_pending_event *event;
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	struct vmw_fence_obj *fence;
	struct drm_device *dev;
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	uint32_t *tv_sec;
	uint32_t *tv_usec;
};

/**
 * 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.
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 */

static void vmw_fence_obj_destroy_locked(struct kref *kref)
{
	struct vmw_fence_obj *fence =
		container_of(kref, struct vmw_fence_obj, kref);

	struct vmw_fence_manager *fman = fence->fman;
	unsigned int num_fences;

	list_del_init(&fence->head);
	num_fences = --fman->num_fence_objects;
	spin_unlock_irq(&fman->lock);
	if (fence->destroy)
		fence->destroy(fence);
	else
		kfree(fence);

	spin_lock_irq(&fman->lock);
}


/**
 * 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;
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	bool seqno_valid;
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	do {
		INIT_LIST_HEAD(&list);
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		mutex_lock(&fman->goal_irq_mutex);

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		spin_lock_irq(&fman->lock);
		list_splice_init(&fman->cleanup_list, &list);
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		seqno_valid = fman->seqno_valid;
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		spin_unlock_irq(&fman->lock);

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		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);

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		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.
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		 * hence fman::lock not held.
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		 */

		list_for_each_entry_safe(action, next_action, &list, head) {
			list_del_init(&action->head);
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			if (action->cleanup)
				action->cleanup(action);
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		}
	} 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));
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	fman->event_fence_action_size =
		ttm_round_pot(sizeof(struct vmw_event_fence_action));
	mutex_init(&fman->goal_irq_mutex);
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	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,
			      uint32_t mask,
			      void (*destroy) (struct vmw_fence_obj *fence))
{
	unsigned long irq_flags;
	unsigned int num_fences;
	int ret = 0;

	fence->seqno = seqno;
	INIT_LIST_HEAD(&fence->seq_passed_actions);
	fence->fman = fman;
	fence->signaled = 0;
	fence->signal_mask = mask;
	kref_init(&fence->kref);
	fence->destroy = destroy;
	init_waitqueue_head(&fence->queue);

	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);
	num_fences = ++fman->num_fence_objects;

out_unlock:
	spin_unlock_irqrestore(&fman->lock, irq_flags);
	return ret;

}

struct vmw_fence_obj *vmw_fence_obj_reference(struct vmw_fence_obj *fence)
{
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	if (unlikely(fence == NULL))
		return NULL;

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	kref_get(&fence->kref);
	return fence;
}

/**
 * vmw_fence_obj_unreference
 *
 * Note that this function may not be entered with disabled irqs since
 * it may re-enable them in the destroy function.
 *
 */
void vmw_fence_obj_unreference(struct vmw_fence_obj **fence_p)
{
	struct vmw_fence_obj *fence = *fence_p;
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	struct vmw_fence_manager *fman;

	if (unlikely(fence == NULL))
		return;
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	fman = fence->fman;
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	*fence_p = NULL;
	spin_lock_irq(&fman->lock);
	BUG_ON(atomic_read(&fence->kref.refcount) == 0);
	kref_put(&fence->kref, vmw_fence_obj_destroy_locked);
	spin_unlock_irq(&fman->lock);
}

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);
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		fman->pending_actions[action->type]--;
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		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.
		 */

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		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;
	__le32 __iomem *fifo_mem;
	struct vmw_fence_obj *fence;

	if (likely(!fman->seqno_valid))
		return false;

	fifo_mem = fman->dev_priv->mmio_virt;
	goal_seqno = ioread32(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;
			iowrite32(fence->seqno,
				  fifo_mem + SVGA_FIFO_FENCE_GOAL);
			break;
		}
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	}
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	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)
{
	u32 goal_seqno;
	__le32 __iomem *fifo_mem;

	if (fence->signaled & DRM_VMW_FENCE_FLAG_EXEC)
		return false;

	fifo_mem = fence->fman->dev_priv->mmio_virt;
	goal_seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE_GOAL);
	if (likely(fence->fman->seqno_valid &&
		   goal_seqno - fence->seqno < VMW_FENCE_WRAP))
		return false;

	iowrite32(fence->seqno, fifo_mem + SVGA_FIFO_FENCE_GOAL);
	fence->fman->seqno_valid = true;

	return true;
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}

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void vmw_fences_update(struct vmw_fence_manager *fman)
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{
	unsigned long flags;
	struct vmw_fence_obj *fence, *next_fence;
	struct list_head action_list;
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	bool needs_rerun;
	uint32_t seqno, new_seqno;
	__le32 __iomem *fifo_mem = fman->dev_priv->mmio_virt;
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	seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE);
rerun:
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	spin_lock_irqsave(&fman->lock, flags);
	list_for_each_entry_safe(fence, next_fence, &fman->fence_list, head) {
		if (seqno - fence->seqno < VMW_FENCE_WRAP) {
			list_del_init(&fence->head);
			fence->signaled |= DRM_VMW_FENCE_FLAG_EXEC;
			INIT_LIST_HEAD(&action_list);
			list_splice_init(&fence->seq_passed_actions,
					 &action_list);
			vmw_fences_perform_actions(fman, &action_list);
			wake_up_all(&fence->queue);
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		} else
			break;
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	}
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	needs_rerun = vmw_fence_goal_new_locked(fman, seqno);

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	if (!list_empty(&fman->cleanup_list))
		(void) schedule_work(&fman->work);
	spin_unlock_irqrestore(&fman->lock, flags);

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	/*
	 * 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.
	 */

	if (unlikely(needs_rerun)) {
		new_seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE);
		if (new_seqno != seqno) {
			seqno = new_seqno;
			goto rerun;
		}
	}
}
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bool vmw_fence_obj_signaled(struct vmw_fence_obj *fence,
			    uint32_t flags)
{
	struct vmw_fence_manager *fman = fence->fman;
	unsigned long irq_flags;
	uint32_t signaled;

	spin_lock_irqsave(&fman->lock, irq_flags);
	signaled = fence->signaled;
	spin_unlock_irqrestore(&fman->lock, irq_flags);

	flags &= fence->signal_mask;
	if ((signaled & flags) == flags)
		return 1;

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	if ((signaled & DRM_VMW_FENCE_FLAG_EXEC) == 0)
		vmw_fences_update(fman);
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	spin_lock_irqsave(&fman->lock, irq_flags);
	signaled = fence->signaled;
	spin_unlock_irqrestore(&fman->lock, irq_flags);

	return ((signaled & flags) == flags);
}

int vmw_fence_obj_wait(struct vmw_fence_obj *fence,
		       uint32_t flags, bool lazy,
		       bool interruptible, unsigned long timeout)
{
	struct vmw_private *dev_priv = fence->fman->dev_priv;
	long ret;

	if (likely(vmw_fence_obj_signaled(fence, flags)))
		return 0;

	vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
	vmw_seqno_waiter_add(dev_priv);

	if (interruptible)
		ret = wait_event_interruptible_timeout
			(fence->queue,
			 vmw_fence_obj_signaled(fence, flags),
			 timeout);
	else
		ret = wait_event_timeout
			(fence->queue,
			 vmw_fence_obj_signaled(fence, flags),
			 timeout);

	vmw_seqno_waiter_remove(dev_priv);

	if (unlikely(ret == 0))
		ret = -EBUSY;
	else if (likely(ret > 0))
		ret = 0;

	return ret;
}

void vmw_fence_obj_flush(struct vmw_fence_obj *fence)
{
	struct vmw_private *dev_priv = fence->fman->dev_priv;

	vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
}

static void vmw_fence_destroy(struct vmw_fence_obj *fence)
{
	struct vmw_fence_manager *fman = fence->fman;

	kfree(fence);
	/*
	 * Free kernel space accounting.
	 */
	ttm_mem_global_free(vmw_mem_glob(fman->dev_priv),
			    fman->fence_size);
}

int vmw_fence_create(struct vmw_fence_manager *fman,
		     uint32_t seqno,
		     uint32_t mask,
		     struct vmw_fence_obj **p_fence)
{
	struct ttm_mem_global *mem_glob = vmw_mem_glob(fman->dev_priv);
	struct vmw_fence_obj *fence;
	int ret;

	ret = ttm_mem_global_alloc(mem_glob, fman->fence_size,
				   false, false);
	if (unlikely(ret != 0))
		return ret;

	fence = kzalloc(sizeof(*fence), GFP_KERNEL);
	if (unlikely(fence == NULL)) {
		ret = -ENOMEM;
		goto out_no_object;
	}

	ret = vmw_fence_obj_init(fman, fence, seqno, mask,
				 vmw_fence_destroy);
	if (unlikely(ret != 0))
		goto out_err_init;

	*p_fence = fence;
	return 0;

out_err_init:
	kfree(fence);
out_no_object:
	ttm_mem_global_free(mem_glob, fman->fence_size);
	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 = fence->fman;

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	ttm_base_object_kfree(ufence, base);
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	/*
	 * 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,
			  uint32_t mask,
			  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,
				 mask, 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)
{
	unsigned long irq_flags;
	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_irqsave(&fman->lock, irq_flags);
	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);
		kref_get(&fence->kref);
		spin_unlock_irq(&fman->lock);

		ret = vmw_fence_obj_wait(fence, fence->signal_mask,
					 false, false,
					 VMW_FENCE_WAIT_TIMEOUT);

		if (unlikely(ret != 0)) {
			list_del_init(&fence->head);
			fence->signaled |= DRM_VMW_FENCE_FLAG_EXEC;
			INIT_LIST_HEAD(&action_list);
			list_splice_init(&fence->seq_passed_actions,
					 &action_list);
			vmw_fences_perform_actions(fman, &action_list);
			wake_up_all(&fence->queue);
		}

		spin_lock_irq(&fman->lock);

		BUG_ON(!list_empty(&fence->head));
		kref_put(&fence->kref, vmw_fence_obj_destroy_locked);
	}
	spin_unlock_irqrestore(&fman->lock, irq_flags);
}

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, arg->flags)) ?
		       0 : -EBUSY);
		goto out;
	}

	timeout = (unsigned long)arg->kernel_cookie - timeout;

	ret = vmw_fence_obj_wait(fence, arg->flags, 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 = fence->fman;

	arg->signaled = vmw_fence_obj_signaled(fence, arg->flags);
	spin_lock_irq(&fman->lock);

	arg->signaled_flags = fence->signaled;
	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);
}
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/**
 * 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);
}

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/**
 * 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
834
 * from irq context.
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 */
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;
841 842
	struct drm_pending_event *event = eaction->event;
	struct drm_file *file_priv;
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	unsigned long irq_flags;

845 846 847 848
	if (unlikely(event == NULL))
		return;

	file_priv = event->file_priv;
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	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;
	}

859
	list_del_init(&eaction->fpriv_head);
860
	list_add_tail(&eaction->event->link, &file_priv->event_list);
861
	eaction->event = NULL;
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	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);
879 880 881 882 883 884
	struct vmw_fence_manager *fman = eaction->fence->fman;
	unsigned long irq_flags;

	spin_lock_irqsave(&fman->lock, irq_flags);
	list_del(&eaction->fpriv_head);
	spin_unlock_irqrestore(&fman->lock, irq_flags);
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	vmw_fence_obj_unreference(&eaction->fence);
887
	kfree(eaction);
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}


/**
 * 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.
 */
void vmw_fence_obj_add_action(struct vmw_fence_obj *fence,
			      struct vmw_fence_action *action)
{
	struct vmw_fence_manager *fman = fence->fman;
	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->signaled & DRM_VMW_FENCE_FLAG_EXEC) {
		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.
 */

955 956 957 958 959 960
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)
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{
962
	struct vmw_event_fence_action *eaction;
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	struct vmw_fence_manager *fman = fence->fman;
964 965
	struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);
	unsigned long irq_flags;
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	eaction = kzalloc(sizeof(*eaction), GFP_KERNEL);
968
	if (unlikely(eaction == NULL))
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		return -ENOMEM;

971
	eaction->event = event;
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	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;

982 983 984 985
	spin_lock_irqsave(&fman->lock, irq_flags);
	list_add_tail(&eaction->fpriv_head, &vmw_fp->fence_events);
	spin_unlock_irqrestore(&fman->lock, irq_flags);

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	vmw_fence_obj_add_action(fence, &eaction->action);

	return 0;
}

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struct vmw_event_fence_pending {
	struct drm_pending_event base;
	struct drm_vmw_event_fence event;
};

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 drm_device *dev = fence->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;
	}


1021
	event = kzalloc(sizeof(*event), GFP_KERNEL);
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061
	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;

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;
}

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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 =
1083 1084
			ttm_base_object_lookup_for_ref(dev_priv->tdev,
						       arg->handle);
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		if (unlikely(base == NULL)) {
			DRM_ERROR("Fence event invalid fence object handle "
				  "0x%08lx.\n",
				  (unsigned long)arg->handle);
			return -EINVAL;
		}
		fence = &(container_of(base, struct vmw_user_fence,
				       base)->fence);
		(void) vmw_fence_obj_reference(fence);

		if (user_fence_rep != NULL) {
			bool existed;

			ret = ttm_ref_object_add(vmw_fp->tfile, base,
						 TTM_REF_USAGE, &existed);
			if (unlikely(ret != 0)) {
				DRM_ERROR("Failed to reference a fence "
					  "object.\n");
				goto out_no_ref_obj;
			}
			handle = base->hash.key;
		}
		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);

	if (arg->flags & DRM_VMW_FE_FLAG_REQ_TIME)
		ret = vmw_event_fence_action_create(file_priv, fence,
1129 1130
						    arg->flags,
						    arg->user_data,
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						    true);
	else
		ret = vmw_event_fence_action_create(file_priv, fence,
1134 1135
						    arg->flags,
						    arg->user_data,
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						    true);

	if (unlikely(ret != 0)) {
		if (ret != -ERESTARTSYS)
			DRM_ERROR("Failed to attach event to fence.\n");
1141
		goto out_no_create;
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	}

	vmw_execbuf_copy_fence_user(dev_priv, vmw_fp, 0, user_fence_rep, fence,
				    handle);
	vmw_fence_obj_unreference(&fence);
	return 0;
1148
out_no_create:
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	if (user_fence_rep != NULL)
		ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
					  handle, TTM_REF_USAGE);
out_no_ref_obj:
	vmw_fence_obj_unreference(&fence);
	return ret;
}