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

 * Copyright 2009-2011 VMware, Inc.  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, sublicense, 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 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

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

 * 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.

 *

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

/*

 * TODO:

 *

 * Fencing is currently a bit inefficient, since we need to call the

 * kernel do determine a fence object signaled status if the fence is not

 * signaled. This can be greatly improved upon by using the fact that the

 * execbuf ioctl returns the last signaled fence seqno, as does the

 * fence signaled ioctl. We should set up a ring of fence objects and

 * walk through them checking for signaled status each time we receive a

 * new passed fence seqno.

 */

#include "util/u_memory.h"

#include "util/u_atomic.h"

#include "pipebuffer/pb_buffer_fenced.h"

#include "vmw_screen.h"

#include "vmw_fence.h"

struct vmw_fence_ops

{

   struct pb_fence_ops base;

   struct vmw_winsys_screen *vws;

};

struct vmw_fence

{

   int32_t refcount;

   uint32_t handle;

   uint32_t mask;

   int32_t signalled;

};

/**

 * vmw_fence - return the vmw_fence object identified by a

 * struct pipe_fence_handle *

 *

 * @fence: The opaque pipe fence handle.

 */

static INLINE struct vmw_fence *

vmw_fence(struct pipe_fence_handle *fence)

{

   return (struct vmw_fence *) fence;

}

/**

 * vmw_fence_create - Create a user-space fence object.

 *

 * @handle: Handle identifying the kernel fence object.

 * @mask: Mask of flags that this fence object may signal.

 *

 * Returns NULL on failure.

 */

struct pipe_fence_handle *

vmw_fence_create(uint32_t handle, uint32_t mask)

{

   struct vmw_fence *fence = CALLOC_STRUCT(vmw_fence);

   if (!fence)

      return NULL;

   p_atomic_set(&fence->refcount, 1);

   fence->handle = handle;

   fence->mask = mask;

   p_atomic_set(&fence->signalled, 0);

   return (struct pipe_fence_handle *) fence;

}

/**

 * vmw_fence_ops - Return the vmw_fence_ops structure backing a

 * struct pb_fence_ops pointer.

 *

 * @ops: Pointer to a struct pb_fence_ops.

 *

 */

static INLINE struct vmw_fence_ops *

vmw_fence_ops(struct pb_fence_ops *ops)

{

   assert(ops);

   return (struct vmw_fence_ops *)ops;

}

/**

 * vmw_fence_reference - Reference / unreference a vmw fence object.

 *

 * @vws: Pointer to the winsys screen.

 * @ptr: Pointer to reference transfer destination.

 * @fence: Pointer to object to reference. May be NULL.

 */

void

vmw_fence_reference(struct vmw_winsys_screen *vws,

		    struct pipe_fence_handle **ptr,

		    struct pipe_fence_handle *fence)

{

   if (*ptr) {

      struct vmw_fence *vfence = vmw_fence(*ptr);

      if (p_atomic_dec_zero(&vfence->refcount)) {

	 vmw_ioctl_fence_unref(vws, vfence->handle);

	 FREE(vfence);

      }

   }

   if (fence) {

      struct vmw_fence *vfence = vmw_fence(fence);

      p_atomic_inc(&vfence->refcount);

   }

   *ptr = fence;

}

/**

 * vmw_fence_signalled - Check whether a fence object is signalled.

 *

 * @vws: Pointer to the winsys screen.

 * @fence: Handle to the fence object.

 * @flag: Fence flags to check. If the fence object can't signal

 * a flag, it is assumed to be already signaled.

 *

 * Returns 0 if the fence object was signaled, nonzero otherwise.

 */

int

vmw_fence_signalled(struct vmw_winsys_screen *vws,

		   struct pipe_fence_handle *fence,

		   unsigned flag)

{

   struct vmw_fence *vfence;

   int32_t vflags = SVGA_FENCE_FLAG_EXEC;

   int ret;

   uint32_t old;

   if (!fence)

      return 0;

   vfence = vmw_fence(fence);

   old = p_atomic_read(&vfence->signalled);

   vflags &= ~vfence->mask;

   if ((old & vflags) == vflags)

      return 0;

   ret = vmw_ioctl_fence_signalled(vws, vfence->handle, vflags);

   if (ret == 0) {

      int32_t prev = old;

      do {

	 old = prev;

	 prev = p_atomic_cmpxchg(&vfence->signalled, old, old | vflags);

      } while (prev != old);

   }

   return ret;

}

/**

 * vmw_fence_finish - Wait for a fence object to signal.

 *

 * @vws: Pointer to the winsys screen.

 * @fence: Handle to the fence object.

 * @flag: Fence flags to wait for. If the fence object can't signal

 * a flag, it is assumed to be already signaled.

 *

 * Returns 0 if the wait succeeded. Nonzero otherwise.

 */

int

vmw_fence_finish(struct vmw_winsys_screen *vws,

		 struct pipe_fence_handle *fence,

		 unsigned flag)

{

   struct vmw_fence *vfence;

   int32_t vflags = SVGA_FENCE_FLAG_EXEC;

   int ret;

   uint32_t old;

   if (!fence)

      return 0;

   vfence = vmw_fence(fence);

   old = p_atomic_read(&vfence->signalled);

   vflags &= ~vfence->mask;

   if ((old & vflags) == vflags)

      return 0;

   ret = vmw_ioctl_fence_finish(vws, vfence->handle, vflags);

   if (ret == 0) {

      int32_t prev = old;

      do {

	 old = prev;

	 prev = p_atomic_cmpxchg(&vfence->signalled, old, old | vflags);

      } while (prev != old);

   }

   return ret;

}

/**

 * vmw_fence_ops_fence_reference - wrapper for the pb_fence_ops api.

 *

 * wrapper around vmw_fence_reference.

 */

static void

vmw_fence_ops_fence_reference(struct pb_fence_ops *ops,

                              struct pipe_fence_handle **ptr,

                              struct pipe_fence_handle *fence)

{

   struct vmw_winsys_screen *vws = vmw_fence_ops(ops)->vws;

   vmw_fence_reference(vws, ptr, fence);

}

/**

 * vmw_fence_ops_fence_signalled - wrapper for the pb_fence_ops api.

 *

 * wrapper around vmw_fence_signalled.

 */

static int

vmw_fence_ops_fence_signalled(struct pb_fence_ops *ops,

                              struct pipe_fence_handle *fence,

                              unsigned flag)

{

   struct vmw_winsys_screen *vws = vmw_fence_ops(ops)->vws;

   return vmw_fence_signalled(vws, fence, flag);

}

/**

 * vmw_fence_ops_fence_finish - wrapper for the pb_fence_ops api.

 *

 * wrapper around vmw_fence_finish.

 */

static int

vmw_fence_ops_fence_finish(struct pb_fence_ops *ops,

                           struct pipe_fence_handle *fence,

                           unsigned flag)

{

   struct vmw_winsys_screen *vws = vmw_fence_ops(ops)->vws;

   return vmw_fence_finish(vws, fence, flag);

}

/**

 * vmw_fence_ops_destroy - Destroy a pb_fence_ops function table.

 *

 * @ops: The function table to destroy.

 *

 * Part of the pb_fence_ops api.

 */

static void

vmw_fence_ops_destroy(struct pb_fence_ops *ops)

{

   FREE(ops);

}

/**

 * vmw_fence_ops_create - Create a pb_fence_ops function table.

 *

 * @vws: Pointer to a struct vmw_winsys_screen.

 *

 * Returns a pointer to a pb_fence_ops function table to interface

 * with pipe_buffer. This function is typically called on driver setup.

 *

 * Returns NULL on failure.

 */

struct pb_fence_ops *

vmw_fence_ops_create(struct vmw_winsys_screen *vws)

{

   struct vmw_fence_ops *ops;

   ops = CALLOC_STRUCT(vmw_fence_ops);

   if(!ops)

      return NULL;

   ops->base.destroy = &vmw_fence_ops_destroy;

   ops->base.fence_reference = &vmw_fence_ops_fence_reference;

   ops->base.fence_signalled = &vmw_fence_ops_fence_signalled;

   ops->base.fence_finish = &vmw_fence_ops_fence_finish;

   ops->vws = vws;

   return &ops->base;

}