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

 *

 * Copyright © 2011-2015 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 

#include "vmwgfx_drv.h"

/**

 * vmw_dmabuf_pin_in_placement - Validate a buffer to placement.

 *

 * @dev_priv:  Driver private.

 * @buf:  DMA buffer to move.

 * @placement:  The placement to pin it.

 * @interruptible:  Use interruptible wait.

 *

 * Returns

 *  -ERESTARTSYS if interrupted by a signal.

 */

int vmw_dmabuf_pin_in_placement(struct vmw_private *dev_priv,

				struct vmw_dma_buffer *buf,

				struct ttm_placement *placement,

				bool interruptible)

{

	struct ttm_buffer_object *bo = &buf->base;

	int ret;

	ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);

	if (unlikely(ret != 0))

		return ret;

	vmw_execbuf_release_pinned_bo(dev_priv);

	ret = ttm_bo_reserve(bo, interruptible, false, false, NULL);

	if (unlikely(ret != 0))

		goto err;

	ret = ttm_bo_validate(bo, placement, interruptible, false);

	if (!ret)

		vmw_bo_pin_reserved(buf, true);

	ttm_bo_unreserve(bo);

err:

	ttm_write_unlock(&dev_priv->reservation_sem);

	return ret;

}

/**

 * vmw_dmabuf_pin_in_vram_or_gmr - Move a buffer to vram or gmr.

 *

 * This function takes the reservation_sem in write mode.

 * Flushes and unpins the query bo to avoid failures.

 *

 * @dev_priv:  Driver private.

 * @buf:  DMA buffer to move.

 * @pin:  Pin buffer if true.

 * @interruptible:  Use interruptible wait.

 *

 * Returns

 * -ERESTARTSYS if interrupted by a signal.

 */

int vmw_dmabuf_pin_in_vram_or_gmr(struct vmw_private *dev_priv,

				  struct vmw_dma_buffer *buf,

				  bool interruptible)

{

	struct ttm_buffer_object *bo = &buf->base;

	int ret;

	ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);

	if (unlikely(ret != 0))

		return ret;

	vmw_execbuf_release_pinned_bo(dev_priv);

	ret = ttm_bo_reserve(bo, interruptible, false, false, NULL);

	if (unlikely(ret != 0))

		goto err;

	ret = ttm_bo_validate(bo, &vmw_vram_gmr_placement, interruptible,

			      false);

	if (likely(ret == 0) || ret == -ERESTARTSYS)

		goto out_unreserve;

	ret = ttm_bo_validate(bo, &vmw_vram_placement, interruptible, false);

out_unreserve:

	if (!ret)

		vmw_bo_pin_reserved(buf, true);

	ttm_bo_unreserve(bo);

err:

	ttm_write_unlock(&dev_priv->reservation_sem);

	return ret;

}

/**

 * vmw_dmabuf_pin_in_vram - Move a buffer to vram.

 *

 * This function takes the reservation_sem in write mode.

 * Flushes and unpins the query bo to avoid failures.

 *

 * @dev_priv:  Driver private.

 * @buf:  DMA buffer to move.

 * @interruptible:  Use interruptible wait.

 *

 * Returns

 * -ERESTARTSYS if interrupted by a signal.

 */

int vmw_dmabuf_pin_in_vram(struct vmw_private *dev_priv,

			   struct vmw_dma_buffer *buf,

			   bool interruptible)

{

	return vmw_dmabuf_pin_in_placement(dev_priv, buf, &vmw_vram_placement,

					   interruptible);

}

/**

 * vmw_dmabuf_pin_in_start_of_vram - Move a buffer to start of vram.

 *

 * This function takes the reservation_sem in write mode.

 * Flushes and unpins the query bo to avoid failures.

 *

 * @dev_priv:  Driver private.

 * @buf:  DMA buffer to pin.

 * @interruptible:  Use interruptible wait.

 *

 * Returns

 * -ERESTARTSYS if interrupted by a signal.

 */

int vmw_dmabuf_pin_in_start_of_vram(struct vmw_private *dev_priv,

				    struct vmw_dma_buffer *buf,

				    bool interruptible)

{

	struct ttm_buffer_object *bo = &buf->base;

	struct ttm_placement placement;

	struct ttm_place place;

	int ret = 0;

	place = vmw_vram_placement.placement[0];

	place.lpfn = bo->num_pages;

	placement.num_placement = 1;

	placement.placement = &place;

	placement.num_busy_placement = 1;

	placement.busy_placement = &place;

	ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);

	if (unlikely(ret != 0))

		return ret;

	vmw_execbuf_release_pinned_bo(dev_priv);

	ret = ttm_bo_reserve(bo, interruptible, false, false, NULL);

	if (unlikely(ret != 0))

		goto err_unlock;

	/*

	 * Is this buffer already in vram but not at the start of it?

	 * In that case, evict it first because TTM isn't good at handling

	 * that situation.

	 */

	if (bo->mem.mem_type == TTM_PL_VRAM &&

	    bo->mem.start < bo->num_pages &&

	    bo->mem.start > 0)

		(void) ttm_bo_validate(bo, &vmw_sys_placement, false, false);

	ret = ttm_bo_validate(bo, &placement, interruptible, false);

	/* For some reason we didn't end up at the start of vram */

	WARN_ON(ret == 0 && bo->offset != 0);

	if (!ret)

		vmw_bo_pin_reserved(buf, true);

	ttm_bo_unreserve(bo);

err_unlock:

	ttm_write_unlock(&dev_priv->reservation_sem);

	return ret;

}

/**

 * vmw_dmabuf_unpin - Unpin the buffer given buffer, does not move the buffer.

 *

 * This function takes the reservation_sem in write mode.

 *

 * @dev_priv:  Driver private.

 * @buf:  DMA buffer to unpin.

 * @interruptible:  Use interruptible wait.

 *

 * Returns

 * -ERESTARTSYS if interrupted by a signal.

 */

int vmw_dmabuf_unpin(struct vmw_private *dev_priv,

		     struct vmw_dma_buffer *buf,

		     bool interruptible)

{

	struct ttm_buffer_object *bo = &buf->base;

	int ret;

	ret = ttm_read_lock(&dev_priv->reservation_sem, interruptible);

	if (unlikely(ret != 0))

		return ret;

	ret = ttm_bo_reserve(bo, interruptible, false, false, NULL);

	if (unlikely(ret != 0))

		goto err;

	vmw_bo_pin_reserved(buf, false);

	ttm_bo_unreserve(bo);

err:

	ttm_read_unlock(&dev_priv->reservation_sem);

	return ret;

}

/**

 * vmw_bo_get_guest_ptr - Get the guest ptr representing the current placement

 * of a buffer.

 *

 * @bo: Pointer to a struct ttm_buffer_object. Must be pinned or reserved.

 * @ptr: SVGAGuestPtr returning the result.

 */

void vmw_bo_get_guest_ptr(const struct ttm_buffer_object *bo,

			  SVGAGuestPtr *ptr)

{

	if (bo->mem.mem_type == TTM_PL_VRAM) {

		ptr->gmrId = SVGA_GMR_FRAMEBUFFER;

		ptr->offset = bo->offset;

	} else {

		ptr->gmrId = bo->mem.start;

		ptr->offset = 0;

	}

}

/**

 * vmw_bo_pin_reserved - Pin or unpin a buffer object without moving it.

 *

 * @vbo: The buffer object. Must be reserved.

 * @pin: Whether to pin or unpin.

 *

 */

void vmw_bo_pin_reserved(struct vmw_dma_buffer *vbo, bool pin)

{

	struct ttm_place pl;

	struct ttm_placement placement;

	struct ttm_buffer_object *bo = &vbo->base;

	uint32_t old_mem_type = bo->mem.mem_type;

	int ret;

	lockdep_assert_held(&bo->resv->lock.base);

	if (pin) {

		if (vbo->pin_count++ > 0)

			return;

	} else {

		WARN_ON(vbo->pin_count <= 0);

		if (--vbo->pin_count > 0)

			return;

	}

	pl.fpfn = 0;

	pl.lpfn = 0;

	pl.flags = TTM_PL_FLAG_VRAM | VMW_PL_FLAG_GMR | VMW_PL_FLAG_MOB

		| TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;

	if (pin)

		pl.flags |= TTM_PL_FLAG_NO_EVICT;

	memset(&placement, 0, sizeof(placement));

	placement.num_placement = 1;

	placement.placement = &pl;

	ret = ttm_bo_validate(bo, &placement, false, true);

	BUG_ON(ret != 0 || bo->mem.mem_type != old_mem_type);

}