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

 *

 * Copyright © 2009-2012 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 "vmwgfx_drv.h"

#include "vmwgfx_resource_priv.h"

#include 

#include "svga3d_surfacedefs.h"

/**

 * struct vmw_user_surface - User-space visible surface resource

 *

 * @base:           The TTM base object handling user-space visibility.

 * @srf:            The surface metadata.

 * @size:           TTM accounting size for the surface.

 * @master:         master of the creating client. Used for security check.

 */

struct vmw_user_surface {

	struct ttm_prime_object prime;

	struct vmw_surface srf;

	uint32_t size;

};

/**

 * struct vmw_surface_offset - Backing store mip level offset info

 *

 * @face:           Surface face.

 * @mip:            Mip level.

 * @bo_offset:      Offset into backing store of this mip level.

 *

 */

struct vmw_surface_offset {

	uint32_t face;

	uint32_t mip;

	uint32_t bo_offset;

};

static void vmw_user_surface_free(struct vmw_resource *res);

static struct vmw_resource *

vmw_user_surface_base_to_res(struct ttm_base_object *base);

static int vmw_legacy_srf_bind(struct vmw_resource *res,

			       struct ttm_validate_buffer *val_buf);

static int vmw_legacy_srf_unbind(struct vmw_resource *res,

				 bool readback,

				 struct ttm_validate_buffer *val_buf);

static int vmw_legacy_srf_create(struct vmw_resource *res);

static int vmw_legacy_srf_destroy(struct vmw_resource *res);

static int vmw_gb_surface_create(struct vmw_resource *res);

static int vmw_gb_surface_bind(struct vmw_resource *res,

			       struct ttm_validate_buffer *val_buf);

static int vmw_gb_surface_unbind(struct vmw_resource *res,

				 bool readback,

				 struct ttm_validate_buffer *val_buf);

static int vmw_gb_surface_destroy(struct vmw_resource *res);

static const struct vmw_user_resource_conv user_surface_conv = {

	.object_type = VMW_RES_SURFACE,

	.base_obj_to_res = vmw_user_surface_base_to_res,

	.res_free = vmw_user_surface_free

};

const struct vmw_user_resource_conv *user_surface_converter =

	&user_surface_conv;

static uint64_t vmw_user_surface_size;

static const struct vmw_res_func vmw_legacy_surface_func = {

	.res_type = vmw_res_surface,

	.needs_backup = false,

	.may_evict = true,

	.type_name = "legacy surfaces",

	.backup_placement = &vmw_srf_placement,

	.create = &vmw_legacy_srf_create,

	.destroy = &vmw_legacy_srf_destroy,

	.bind = &vmw_legacy_srf_bind,

	.unbind = &vmw_legacy_srf_unbind

};

static const struct vmw_res_func vmw_gb_surface_func = {

	.res_type = vmw_res_surface,

	.needs_backup = true,

	.may_evict = true,

	.type_name = "guest backed surfaces",

	.backup_placement = &vmw_mob_placement,

	.create = vmw_gb_surface_create,

	.destroy = vmw_gb_surface_destroy,

	.bind = vmw_gb_surface_bind,

	.unbind = vmw_gb_surface_unbind

};

/**

 * struct vmw_surface_dma - SVGA3D DMA command

 */

struct vmw_surface_dma {

	SVGA3dCmdHeader header;

	SVGA3dCmdSurfaceDMA body;

	SVGA3dCopyBox cb;

	SVGA3dCmdSurfaceDMASuffix suffix;

};

/**

 * struct vmw_surface_define - SVGA3D Surface Define command

 */

struct vmw_surface_define {

	SVGA3dCmdHeader header;

	SVGA3dCmdDefineSurface body;

};

/**

 * struct vmw_surface_destroy - SVGA3D Surface Destroy command

 */

struct vmw_surface_destroy {

	SVGA3dCmdHeader header;

	SVGA3dCmdDestroySurface body;

};

/**

 * vmw_surface_dma_size - Compute fifo size for a dma command.

 *

 * @srf: Pointer to a struct vmw_surface

 *

 * Computes the required size for a surface dma command for backup or

 * restoration of the surface represented by @srf.

 */

static inline uint32_t vmw_surface_dma_size(const struct vmw_surface *srf)

{

	return srf->num_sizes * sizeof(struct vmw_surface_dma);

}

/**

 * vmw_surface_define_size - Compute fifo size for a surface define command.

 *

 * @srf: Pointer to a struct vmw_surface

 *

 * Computes the required size for a surface define command for the definition

 * of the surface represented by @srf.

 */

static inline uint32_t vmw_surface_define_size(const struct vmw_surface *srf)

{

	return sizeof(struct vmw_surface_define) + srf->num_sizes *

		sizeof(SVGA3dSize);

}

/**

 * vmw_surface_destroy_size - Compute fifo size for a surface destroy command.

 *

 * Computes the required size for a surface destroy command for the destruction

 * of a hw surface.

 */

static inline uint32_t vmw_surface_destroy_size(void)

{

	return sizeof(struct vmw_surface_destroy);

}

/**

 * vmw_surface_destroy_encode - Encode a surface_destroy command.

 *

 * @id: The surface id

 * @cmd_space: Pointer to memory area in which the commands should be encoded.

 */

static void vmw_surface_destroy_encode(uint32_t id,

				       void *cmd_space)

{

	struct vmw_surface_destroy *cmd = (struct vmw_surface_destroy *)

		cmd_space;

	cmd->header.id = SVGA_3D_CMD_SURFACE_DESTROY;

	cmd->header.size = sizeof(cmd->body);

	cmd->body.sid = id;

}

/**

 * vmw_surface_define_encode - Encode a surface_define command.

 *

 * @srf: Pointer to a struct vmw_surface object.

 * @cmd_space: Pointer to memory area in which the commands should be encoded.

 */

static void vmw_surface_define_encode(const struct vmw_surface *srf,

				      void *cmd_space)

{

	struct vmw_surface_define *cmd = (struct vmw_surface_define *)

		cmd_space;

	struct drm_vmw_size *src_size;

	SVGA3dSize *cmd_size;

	uint32_t cmd_len;

	int i;

	cmd_len = sizeof(cmd->body) + srf->num_sizes * sizeof(SVGA3dSize);

	cmd->header.id = SVGA_3D_CMD_SURFACE_DEFINE;

	cmd->header.size = cmd_len;

	cmd->body.sid = srf->res.id;

	cmd->body.surfaceFlags = srf->flags;

	cmd->body.format = cpu_to_le32(srf->format);

	for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i)

		cmd->body.face[i].numMipLevels = srf->mip_levels[i];

	cmd += 1;

	cmd_size = (SVGA3dSize *) cmd;

	src_size = srf->sizes;

	for (i = 0; i < srf->num_sizes; ++i, cmd_size++, src_size++) {

		cmd_size->width = src_size->width;

		cmd_size->height = src_size->height;

		cmd_size->depth = src_size->depth;

	}

}

/**

 * vmw_surface_dma_encode - Encode a surface_dma command.

 *

 * @srf: Pointer to a struct vmw_surface object.

 * @cmd_space: Pointer to memory area in which the commands should be encoded.

 * @ptr: Pointer to an SVGAGuestPtr indicating where the surface contents

 * should be placed or read from.

 * @to_surface: Boolean whether to DMA to the surface or from the surface.

 */

static void vmw_surface_dma_encode(struct vmw_surface *srf,

				   void *cmd_space,

				   const SVGAGuestPtr *ptr,

				   bool to_surface)

{

	uint32_t i;

	struct vmw_surface_dma *cmd = (struct vmw_surface_dma *)cmd_space;

	const struct svga3d_surface_desc *desc =

		svga3dsurface_get_desc(srf->format);

	for (i = 0; i < srf->num_sizes; ++i) {

		SVGA3dCmdHeader *header = &cmd->header;

		SVGA3dCmdSurfaceDMA *body = &cmd->body;

		SVGA3dCopyBox *cb = &cmd->cb;

		SVGA3dCmdSurfaceDMASuffix *suffix = &cmd->suffix;

		const struct vmw_surface_offset *cur_offset = &srf->offsets[i];

		const struct drm_vmw_size *cur_size = &srf->sizes[i];

		header->id = SVGA_3D_CMD_SURFACE_DMA;

		header->size = sizeof(*body) + sizeof(*cb) + sizeof(*suffix);

		body->guest.ptr = *ptr;

		body->guest.ptr.offset += cur_offset->bo_offset;

		body->guest.pitch = svga3dsurface_calculate_pitch(desc,

								  cur_size);

		body->host.sid = srf->res.id;

		body->host.face = cur_offset->face;

		body->host.mipmap = cur_offset->mip;

		body->transfer = ((to_surface) ?  SVGA3D_WRITE_HOST_VRAM :

				  SVGA3D_READ_HOST_VRAM);

		cb->x = 0;

		cb->y = 0;

		cb->z = 0;

		cb->srcx = 0;

		cb->srcy = 0;

		cb->srcz = 0;

		cb->w = cur_size->width;

		cb->h = cur_size->height;

		cb->d = cur_size->depth;

		suffix->suffixSize = sizeof(*suffix);

		suffix->maximumOffset =

			svga3dsurface_get_image_buffer_size(desc, cur_size,

							    body->guest.pitch);

		suffix->flags.discard = 0;

		suffix->flags.unsynchronized = 0;

		suffix->flags.reserved = 0;

		++cmd;

	}

};

/**

 * vmw_hw_surface_destroy - destroy a Device surface

 *

 * @res:        Pointer to a struct vmw_resource embedded in a struct

 *              vmw_surface.

 *

 * Destroys a the device surface associated with a struct vmw_surface if

 * any, and adjusts accounting and resource count accordingly.

 */

static void vmw_hw_surface_destroy(struct vmw_resource *res)

{

	struct vmw_private *dev_priv = res->dev_priv;

	struct vmw_surface *srf;

	void *cmd;

	if (res->func->destroy == vmw_gb_surface_destroy) {

		(void) vmw_gb_surface_destroy(res);

		return;

	}

	if (res->id != -1) {

		cmd = vmw_fifo_reserve(dev_priv, vmw_surface_destroy_size());

		if (unlikely(cmd == NULL)) {

			DRM_ERROR("Failed reserving FIFO space for surface "

				  "destruction.\n");

			return;

		}

		vmw_surface_destroy_encode(res->id, cmd);

		vmw_fifo_commit(dev_priv, vmw_surface_destroy_size());

		/*

		 * used_memory_size_atomic, or separate lock

		 * to avoid taking dev_priv::cmdbuf_mutex in

		 * the destroy path.

		 */

		mutex_lock(&dev_priv->cmdbuf_mutex);

		srf = vmw_res_to_srf(res);

		dev_priv->used_memory_size -= res->backup_size;

		mutex_unlock(&dev_priv->cmdbuf_mutex);

	}

	vmw_3d_resource_dec(dev_priv, false);

}

/**

 * vmw_legacy_srf_create - Create a device surface as part of the

 * resource validation process.

 *

 * @res: Pointer to a struct vmw_surface.

 *

 * If the surface doesn't have a hw id.

 *

 * Returns -EBUSY if there wasn't sufficient device resources to

 * complete the validation. Retry after freeing up resources.

 *

 * May return other errors if the kernel is out of guest resources.

 */

static int vmw_legacy_srf_create(struct vmw_resource *res)

{

	struct vmw_private *dev_priv = res->dev_priv;

	struct vmw_surface *srf;

	uint32_t submit_size;

	uint8_t *cmd;

	int ret;

	if (likely(res->id != -1))

		return 0;

	srf = vmw_res_to_srf(res);

	if (unlikely(dev_priv->used_memory_size + res->backup_size >=

		     dev_priv->memory_size))

		return -EBUSY;

	/*

	 * Alloc id for the resource.

	 */

	ret = vmw_resource_alloc_id(res);

	if (unlikely(ret != 0)) {

		DRM_ERROR("Failed to allocate a surface id.\n");

		goto out_no_id;

	}

	if (unlikely(res->id >= SVGA3D_MAX_SURFACE_IDS)) {

		ret = -EBUSY;

		goto out_no_fifo;

	}

	/*

	 * Encode surface define- commands.

	 */

	submit_size = vmw_surface_define_size(srf);

	cmd = vmw_fifo_reserve(dev_priv, submit_size);

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Failed reserving FIFO space for surface "

			  "creation.\n");

		ret = -ENOMEM;

		goto out_no_fifo;

	}

	vmw_surface_define_encode(srf, cmd);

	vmw_fifo_commit(dev_priv, submit_size);

	/*

	 * Surface memory usage accounting.

	 */

	dev_priv->used_memory_size += res->backup_size;

	return 0;

out_no_fifo:

	vmw_resource_release_id(res);

out_no_id:

	return ret;

}

/**

 * vmw_legacy_srf_dma - Copy backup data to or from a legacy surface.

 *

 * @res:            Pointer to a struct vmw_res embedded in a struct

 *                  vmw_surface.

 * @val_buf:        Pointer to a struct ttm_validate_buffer containing

 *                  information about the backup buffer.

 * @bind:           Boolean wether to DMA to the surface.

 *

 * Transfer backup data to or from a legacy surface as part of the

 * validation process.

 * May return other errors if the kernel is out of guest resources.

 * The backup buffer will be fenced or idle upon successful completion,

 * and if the surface needs persistent backup storage, the backup buffer

 * will also be returned reserved iff @bind is true.

 */

static int vmw_legacy_srf_dma(struct vmw_resource *res,

			      struct ttm_validate_buffer *val_buf,

			      bool bind)

{

	SVGAGuestPtr ptr;

	struct vmw_fence_obj *fence;

	uint32_t submit_size;

	struct vmw_surface *srf = vmw_res_to_srf(res);

	uint8_t *cmd;

	struct vmw_private *dev_priv = res->dev_priv;

	BUG_ON(val_buf->bo == NULL);

	submit_size = vmw_surface_dma_size(srf);

	cmd = vmw_fifo_reserve(dev_priv, submit_size);

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Failed reserving FIFO space for surface "

			  "DMA.\n");

		return -ENOMEM;

	}

	vmw_bo_get_guest_ptr(val_buf->bo, &ptr);

	vmw_surface_dma_encode(srf, cmd, &ptr, bind);

	vmw_fifo_commit(dev_priv, submit_size);

	/*

	 * Create a fence object and fence the backup buffer.

	 */

	(void) vmw_execbuf_fence_commands(NULL, dev_priv,

					  &fence, NULL);

	vmw_fence_single_bo(val_buf->bo, fence);

	if (likely(fence != NULL))

		vmw_fence_obj_unreference(&fence);

	return 0;

}

/**

 * vmw_legacy_srf_bind - Perform a legacy surface bind as part of the

 *                       surface validation process.

 *

 * @res:            Pointer to a struct vmw_res embedded in a struct

 *                  vmw_surface.

 * @val_buf:        Pointer to a struct ttm_validate_buffer containing

 *                  information about the backup buffer.

 *

 * This function will copy backup data to the surface if the

 * backup buffer is dirty.

 */

static int vmw_legacy_srf_bind(struct vmw_resource *res,

			       struct ttm_validate_buffer *val_buf)

{

	if (!res->backup_dirty)

		return 0;

	return vmw_legacy_srf_dma(res, val_buf, true);

}

/**

 * vmw_legacy_srf_unbind - Perform a legacy surface unbind as part of the

 *                         surface eviction process.

 *

 * @res:            Pointer to a struct vmw_res embedded in a struct

 *                  vmw_surface.

 * @val_buf:        Pointer to a struct ttm_validate_buffer containing

 *                  information about the backup buffer.

 *

 * This function will copy backup data from the surface.

 */

static int vmw_legacy_srf_unbind(struct vmw_resource *res,

				 bool readback,

				 struct ttm_validate_buffer *val_buf)

{

	if (unlikely(readback))

		return vmw_legacy_srf_dma(res, val_buf, false);

	return 0;

}

/**

 * vmw_legacy_srf_destroy - Destroy a device surface as part of a

 *                          resource eviction process.

 *

 * @res:            Pointer to a struct vmw_res embedded in a struct

 *                  vmw_surface.

 */

static int vmw_legacy_srf_destroy(struct vmw_resource *res)

{

	struct vmw_private *dev_priv = res->dev_priv;

	uint32_t submit_size;

	uint8_t *cmd;

	BUG_ON(res->id == -1);

	/*

	 * Encode the dma- and surface destroy commands.

	 */

	submit_size = vmw_surface_destroy_size();

	cmd = vmw_fifo_reserve(dev_priv, submit_size);

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Failed reserving FIFO space for surface "

			  "eviction.\n");

		return -ENOMEM;

	}

	vmw_surface_destroy_encode(res->id, cmd);

	vmw_fifo_commit(dev_priv, submit_size);

	/*

	 * Surface memory usage accounting.

	 */

	dev_priv->used_memory_size -= res->backup_size;

	/*

	 * Release the surface ID.

	 */

	vmw_resource_release_id(res);

	return 0;

}

/**

 * vmw_surface_init - initialize a struct vmw_surface

 *

 * @dev_priv:       Pointer to a device private struct.

 * @srf:            Pointer to the struct vmw_surface to initialize.

 * @res_free:       Pointer to a resource destructor used to free

 *                  the object.

 */

static int vmw_surface_init(struct vmw_private *dev_priv,

			    struct vmw_surface *srf,

			    void (*res_free) (struct vmw_resource *res))

{

	int ret;

	struct vmw_resource *res = &srf->res;

	BUG_ON(res_free == NULL);

	if (!dev_priv->has_mob)

	(void) vmw_3d_resource_inc(dev_priv, false);

	ret = vmw_resource_init(dev_priv, res, true, res_free,

				(dev_priv->has_mob) ? &vmw_gb_surface_func :

				&vmw_legacy_surface_func);

	if (unlikely(ret != 0)) {

		if (!dev_priv->has_mob)

		vmw_3d_resource_dec(dev_priv, false);

		res_free(res);

		return ret;

	}

	/*

	 * The surface won't be visible to hardware until a

	 * surface validate.

	 */

	vmw_resource_activate(res, vmw_hw_surface_destroy);

	return ret;

}

/**

 * vmw_user_surface_base_to_res - TTM base object to resource converter for

 *                                user visible surfaces

 *

 * @base:           Pointer to a TTM base object

 *

 * Returns the struct vmw_resource embedded in a struct vmw_surface

 * for the user-visible object identified by the TTM base object @base.

 */

static struct vmw_resource *

vmw_user_surface_base_to_res(struct ttm_base_object *base)

{

	return &(container_of(base, struct vmw_user_surface,

			      prime.base)->srf.res);

}

/**

 * vmw_user_surface_free - User visible surface resource destructor

 *

 * @res:            A struct vmw_resource embedded in a struct vmw_surface.

 */

static void vmw_user_surface_free(struct vmw_resource *res)

{

	struct vmw_surface *srf = vmw_res_to_srf(res);

	struct vmw_user_surface *user_srf =

	    container_of(srf, struct vmw_user_surface, srf);

	struct vmw_private *dev_priv = srf->res.dev_priv;

	uint32_t size = user_srf->size;

	kfree(srf->offsets);

	kfree(srf->sizes);

	kfree(srf->snooper.image);

//   ttm_base_object_kfree(user_srf, base);

	ttm_mem_global_free(vmw_mem_glob(dev_priv), size);

}

/**

 * vmw_user_surface_free - User visible surface TTM base object destructor

 *

 * @p_base:         Pointer to a pointer to a TTM base object

 *                  embedded in a struct vmw_user_surface.

 *

 * Drops the base object's reference on its resource, and the

 * pointer pointed to by *p_base is set to NULL.

 */

static void vmw_user_surface_base_release(struct ttm_base_object **p_base)

{

	struct ttm_base_object *base = *p_base;

	struct vmw_user_surface *user_srf =

	    container_of(base, struct vmw_user_surface, prime.base);

	struct vmw_resource *res = &user_srf->srf.res;

	*p_base = NULL;

	vmw_resource_unreference(&res);

}

#if 0

/**

 * vmw_user_surface_define_ioctl - Ioctl function implementing

 *                                  the user surface define functionality.

 *

 * @dev:            Pointer to a struct drm_device.

 * @data:           Pointer to data copied from / to user-space.

 * @file_priv:      Pointer to a drm file private structure.

 */

int vmw_surface_define_ioctl(struct drm_device *dev, void *data,

			     struct drm_file *file_priv)

{

	struct vmw_private *dev_priv = vmw_priv(dev);

	struct vmw_user_surface *user_srf;

	struct vmw_surface *srf;

	struct vmw_resource *res;

	struct vmw_resource *tmp;

	union drm_vmw_surface_create_arg *arg =

	    (union drm_vmw_surface_create_arg *)data;

	struct drm_vmw_surface_create_req *req = &arg->req;

	struct drm_vmw_surface_arg *rep = &arg->rep;

	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;

	struct drm_vmw_size __user *user_sizes;

	int ret;

	int i, j;

	uint32_t cur_bo_offset;

	struct drm_vmw_size *cur_size;

	struct vmw_surface_offset *cur_offset;

	uint32_t num_sizes;

	uint32_t size;

	const struct svga3d_surface_desc *desc;

	if (unlikely(vmw_user_surface_size == 0))

		vmw_user_surface_size = ttm_round_pot(sizeof(*user_srf)) +

			128;

	num_sizes = 0;

	for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i)

		num_sizes += req->mip_levels[i];

	if (num_sizes > DRM_VMW_MAX_SURFACE_FACES *

	    DRM_VMW_MAX_MIP_LEVELS)

		return -EINVAL;

	size = vmw_user_surface_size + 128 +

		ttm_round_pot(num_sizes * sizeof(struct drm_vmw_size)) +

		ttm_round_pot(num_sizes * sizeof(struct vmw_surface_offset));

	desc = svga3dsurface_get_desc(req->format);

	if (unlikely(desc->block_desc == SVGA3DBLOCKDESC_NONE)) {

		DRM_ERROR("Invalid surface format for surface creation.\n");

		return -EINVAL;

	}

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

	if (unlikely(ret != 0))

		return ret;

	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),

				   size, false, true);

	if (unlikely(ret != 0)) {

		if (ret != -ERESTARTSYS)

			DRM_ERROR("Out of graphics memory for surface"

				  " creation.\n");

		goto out_unlock;

	}

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

	if (unlikely(user_srf == NULL)) {

		ret = -ENOMEM;

		goto out_no_user_srf;

	}

	srf = &user_srf->srf;

	res = &srf->res;

	srf->flags = req->flags;

	srf->format = req->format;

	srf->scanout = req->scanout;

	memcpy(srf->mip_levels, req->mip_levels, sizeof(srf->mip_levels));

	srf->num_sizes = num_sizes;

	user_srf->size = size;

	srf->sizes = kmalloc(srf->num_sizes * sizeof(*srf->sizes), GFP_KERNEL);

	if (unlikely(srf->sizes == NULL)) {

		ret = -ENOMEM;

		goto out_no_sizes;

	}

	srf->offsets = kmalloc(srf->num_sizes * sizeof(*srf->offsets),

			       GFP_KERNEL);

	if (unlikely(srf->sizes == NULL)) {

		ret = -ENOMEM;

		goto out_no_offsets;

	}

	user_sizes = (struct drm_vmw_size __user *)(unsigned long)

	    req->size_addr;

	ret = copy_from_user(srf->sizes, user_sizes,

			     srf->num_sizes * sizeof(*srf->sizes));

	if (unlikely(ret != 0)) {

		ret = -EFAULT;

		goto out_no_copy;

	}

	srf->base_size = *srf->sizes;

	srf->autogen_filter = SVGA3D_TEX_FILTER_NONE;

	srf->multisample_count = 0;

	cur_bo_offset = 0;

	cur_offset = srf->offsets;

	cur_size = srf->sizes;

	for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i) {

		for (j = 0; j < srf->mip_levels[i]; ++j) {

			uint32_t stride = svga3dsurface_calculate_pitch

				(desc, cur_size);

			cur_offset->face = i;

			cur_offset->mip = j;

			cur_offset->bo_offset = cur_bo_offset;

			cur_bo_offset += svga3dsurface_get_image_buffer_size

				(desc, cur_size, stride);

			++cur_offset;

			++cur_size;

		}

	}

	res->backup_size = cur_bo_offset;

	if (srf->scanout &&

	    srf->num_sizes == 1 &&

	    srf->sizes[0].width == 64 &&

	    srf->sizes[0].height == 64 &&

	    srf->format == SVGA3D_A8R8G8B8) {

		srf->snooper.image = kmalloc(64 * 64 * 4, GFP_KERNEL);

		/* clear the image */

		if (srf->snooper.image) {

			memset(srf->snooper.image, 0x00, 64 * 64 * 4);

		} else {

			DRM_ERROR("Failed to allocate cursor_image\n");

			ret = -ENOMEM;

			goto out_no_copy;

		}

	} else {

		srf->snooper.image = NULL;

	}

	srf->snooper.crtc = NULL;

	user_srf->prime.base.shareable = false;

	user_srf->prime.base.tfile = NULL;

	/**

	 * From this point, the generic resource management functions

	 * destroy the object on failure.

	 */

	ret = vmw_surface_init(dev_priv, srf, vmw_user_surface_free);

	if (unlikely(ret != 0))

		goto out_unlock;

	tmp = vmw_resource_reference(&srf->res);

	ret = ttm_prime_object_init(tfile, res->backup_size, &user_srf->prime,

				   req->shareable, VMW_RES_SURFACE,

				   &vmw_user_surface_base_release, NULL);

	if (unlikely(ret != 0)) {

		vmw_resource_unreference(&tmp);

		vmw_resource_unreference(&res);

		goto out_unlock;

	}

	rep->sid = user_srf->prime.base.hash.key;

	vmw_resource_unreference(&res);

	ttm_read_unlock(&dev_priv->reservation_sem);

	return 0;

out_no_copy:

	kfree(srf->offsets);

out_no_offsets:

	kfree(srf->sizes);

out_no_sizes:

	ttm_prime_object_kfree(user_srf, prime);

out_no_user_srf:

	ttm_mem_global_free(vmw_mem_glob(dev_priv), size);

out_unlock:

	ttm_read_unlock(&dev_priv->reservation_sem);

	return ret;

}

/**

 * vmw_user_surface_define_ioctl - Ioctl function implementing

 *                                  the user surface reference functionality.

 *

 * @dev:            Pointer to a struct drm_device.

 * @data:           Pointer to data copied from / to user-space.

 * @file_priv:      Pointer to a drm file private structure.

 */

int vmw_surface_reference_ioctl(struct drm_device *dev, void *data,

				struct drm_file *file_priv)

{

	struct vmw_private *dev_priv = vmw_priv(dev);

	union drm_vmw_surface_reference_arg *arg =

	    (union drm_vmw_surface_reference_arg *)data;

	struct drm_vmw_surface_arg *req = &arg->req;

	struct drm_vmw_surface_create_req *rep = &arg->rep;

	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;

	struct vmw_surface *srf;

	struct vmw_user_surface *user_srf;

	struct drm_vmw_size __user *user_sizes;

	struct ttm_base_object *base;

	int ret;

	ret = vmw_surface_handle_reference(dev_priv, file_priv, req->sid,

					   req->handle_type, &base);

	if (unlikely(ret != 0))

		return ret;

	user_srf = container_of(base, struct vmw_user_surface, prime.base);

	srf = &user_srf->srf;

	rep->flags = srf->flags;

	rep->format = srf->format;

	memcpy(rep->mip_levels, srf->mip_levels, sizeof(srf->mip_levels));

	user_sizes = (struct drm_vmw_size __user *)(unsigned long)

	    rep->size_addr;

	if (user_sizes)

		ret = copy_to_user(user_sizes, &srf->base_size,

				   sizeof(srf->base_size));

	if (unlikely(ret != 0)) {

		DRM_ERROR("copy_to_user failed %p %u\n",

			  user_sizes, srf->num_sizes);

		ttm_ref_object_base_unref(tfile, base->hash.key, TTM_REF_USAGE);

		ret = -EFAULT;

	}

out_bad_resource:

out_no_reference:

	ttm_base_object_unref(&base);

	return ret;

}

#endif