drivers/gpu/drm/vmwgfx/vmwgfx_context.c - kernel/msm-4.9 - Gitiles

 /**************************************************************************
  *
  * 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 "ttm/ttm_placement.h"

 struct vmw_user_context {
 	struct ttm_base_object base;
 	struct vmw_resource res;
 	struct vmw_ctx_binding_state cbs;
 };


 typedef int (*vmw_scrub_func)(struct vmw_ctx_bindinfo *);

 static void vmw_user_context_free(struct vmw_resource *res);
 static struct vmw_resource *
 vmw_user_context_base_to_res(struct ttm_base_object *base);

 static int vmw_gb_context_create(struct vmw_resource *res);
 static int vmw_gb_context_bind(struct vmw_resource *res,
 			       struct ttm_validate_buffer *val_buf);
 static int vmw_gb_context_unbind(struct vmw_resource *res,
 				 bool readback,
 				 struct ttm_validate_buffer *val_buf);
 static int vmw_gb_context_destroy(struct vmw_resource *res);
 static int vmw_context_scrub_shader(struct vmw_ctx_bindinfo *bi);
 static int vmw_context_scrub_render_target(struct vmw_ctx_bindinfo *bi);
 static int vmw_context_scrub_texture(struct vmw_ctx_bindinfo *bi);
 static void vmw_context_binding_state_kill(struct vmw_ctx_binding_state *cbs);
 static uint64_t vmw_user_context_size;

 static const struct vmw_user_resource_conv user_context_conv = {
 	.object_type = VMW_RES_CONTEXT,
 	.base_obj_to_res = vmw_user_context_base_to_res,
 	.res_free = vmw_user_context_free
 };

 const struct vmw_user_resource_conv *user_context_converter =
 	&user_context_conv;


 static const struct vmw_res_func vmw_legacy_context_func = {
 	.res_type = vmw_res_context,
 	.needs_backup = false,
 	.may_evict = false,
 	.type_name = "legacy contexts",
 	.backup_placement = NULL,
 	.create = NULL,
 	.destroy = NULL,
 	.bind = NULL,
 	.unbind = NULL
 };

 static const struct vmw_res_func vmw_gb_context_func = {
 	.res_type = vmw_res_context,
 	.needs_backup = true,
 	.may_evict = true,
 	.type_name = "guest backed contexts",
 	.backup_placement = &vmw_mob_placement,
 	.create = vmw_gb_context_create,
 	.destroy = vmw_gb_context_destroy,
 	.bind = vmw_gb_context_bind,
 	.unbind = vmw_gb_context_unbind
 };

 static const vmw_scrub_func vmw_scrub_funcs[vmw_ctx_binding_max] = {
 	[vmw_ctx_binding_shader] = vmw_context_scrub_shader,
 	[vmw_ctx_binding_rt] = vmw_context_scrub_render_target,
 	[vmw_ctx_binding_tex] = vmw_context_scrub_texture };

 /**
  * Context management:
  */

 static void vmw_hw_context_destroy(struct vmw_resource *res)
 {

 	struct vmw_private *dev_priv = res->dev_priv;
 	struct {
 		SVGA3dCmdHeader header;
 		SVGA3dCmdDestroyContext body;
 	} *cmd;


 	if (res->func->destroy == vmw_gb_context_destroy) {
 		mutex_lock(&dev_priv->cmdbuf_mutex);
 		(void) vmw_gb_context_destroy(res);
 		if (dev_priv->pinned_bo != NULL &&
 		    !dev_priv->query_cid_valid)
 			__vmw_execbuf_release_pinned_bo(dev_priv, NULL);
 		mutex_unlock(&dev_priv->cmdbuf_mutex);
 		return;
 	}

 	vmw_execbuf_release_pinned_bo(dev_priv);
 	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 	if (unlikely(cmd == NULL)) {
 		DRM_ERROR("Failed reserving FIFO space for surface "
 			  "destruction.\n");
 		return;
 	}

 	cmd->header.id = cpu_to_le32(SVGA_3D_CMD_CONTEXT_DESTROY);
 	cmd->header.size = cpu_to_le32(sizeof(cmd->body));
 	cmd->body.cid = cpu_to_le32(res->id);

 	vmw_fifo_commit(dev_priv, sizeof(*cmd));
 	vmw_3d_resource_dec(dev_priv, false);
 }

 static int vmw_gb_context_init(struct vmw_private *dev_priv,
 			       struct vmw_resource *res,
 			       void (*res_free) (struct vmw_resource *res))
 {
 	int ret;
 	struct vmw_user_context *uctx =
 		container_of(res, struct vmw_user_context, res);

 	ret = vmw_resource_init(dev_priv, res, true,
 				res_free, &vmw_gb_context_func);
 	res->backup_size = SVGA3D_CONTEXT_DATA_SIZE;

 	if (unlikely(ret != 0)) {
 		if (res_free)
 			res_free(res);
 		else
 			kfree(res);
 		return ret;
 	}

 	memset(&uctx->cbs, 0, sizeof(uctx->cbs));
 	INIT_LIST_HEAD(&uctx->cbs.list);

 	vmw_resource_activate(res, vmw_hw_context_destroy);
 	return 0;
 }

 static int vmw_context_init(struct vmw_private *dev_priv,
 			    struct vmw_resource *res,
 			    void (*res_free) (struct vmw_resource *res))
 {
 	int ret;

 	struct {
 		SVGA3dCmdHeader header;
 		SVGA3dCmdDefineContext body;
 	} *cmd;

 	if (dev_priv->has_mob)
 		return vmw_gb_context_init(dev_priv, res, res_free);

 	ret = vmw_resource_init(dev_priv, res, false,
 				res_free, &vmw_legacy_context_func);

 	if (unlikely(ret != 0)) {
 		DRM_ERROR("Failed to allocate a resource id.\n");
 		goto out_early;
 	}

 	if (unlikely(res->id >= SVGA3D_MAX_CONTEXT_IDS)) {
 		DRM_ERROR("Out of hw context ids.\n");
 		vmw_resource_unreference(&res);
 		return -ENOMEM;
 	}

 	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 	if (unlikely(cmd == NULL)) {
 		DRM_ERROR("Fifo reserve failed.\n");
 		vmw_resource_unreference(&res);
 		return -ENOMEM;
 	}

 	cmd->header.id = cpu_to_le32(SVGA_3D_CMD_CONTEXT_DEFINE);
 	cmd->header.size = cpu_to_le32(sizeof(cmd->body));
 	cmd->body.cid = cpu_to_le32(res->id);

 	vmw_fifo_commit(dev_priv, sizeof(*cmd));
 	(void) vmw_3d_resource_inc(dev_priv, false);
 	vmw_resource_activate(res, vmw_hw_context_destroy);
 	return 0;

 out_early:
 	if (res_free == NULL)
 		kfree(res);
 	else
 		res_free(res);
 	return ret;
 }

 struct vmw_resource *vmw_context_alloc(struct vmw_private *dev_priv)
 {
 	struct vmw_resource *res = kmalloc(sizeof(*res), GFP_KERNEL);
 	int ret;

 	if (unlikely(res == NULL))
 		return NULL;

 	ret = vmw_context_init(dev_priv, res, NULL);

 	return (ret == 0) ? res : NULL;
 }


 static int vmw_gb_context_create(struct vmw_resource *res)
 {
 	struct vmw_private *dev_priv = res->dev_priv;
 	int ret;
 	struct {
 		SVGA3dCmdHeader header;
 		SVGA3dCmdDefineGBContext body;
 	} *cmd;

 	if (likely(res->id != -1))
 		return 0;

 	ret = vmw_resource_alloc_id(res);
 	if (unlikely(ret != 0)) {
 		DRM_ERROR("Failed to allocate a context id.\n");
 		goto out_no_id;
 	}

 	if (unlikely(res->id >= VMWGFX_NUM_GB_CONTEXT)) {
 		ret = -EBUSY;
 		goto out_no_fifo;
 	}

 	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 	if (unlikely(cmd == NULL)) {
 		DRM_ERROR("Failed reserving FIFO space for context "
 			  "creation.\n");
 		ret = -ENOMEM;
 		goto out_no_fifo;
 	}

 	cmd->header.id = SVGA_3D_CMD_DEFINE_GB_CONTEXT;
 	cmd->header.size = sizeof(cmd->body);
 	cmd->body.cid = res->id;
 	vmw_fifo_commit(dev_priv, sizeof(*cmd));
 	(void) vmw_3d_resource_inc(dev_priv, false);

 	return 0;

 out_no_fifo:
 	vmw_resource_release_id(res);
 out_no_id:
 	return ret;
 }

 static int vmw_gb_context_bind(struct vmw_resource *res,
 			       struct ttm_validate_buffer *val_buf)
 {
 	struct vmw_private *dev_priv = res->dev_priv;
 	struct {
 		SVGA3dCmdHeader header;
 		SVGA3dCmdBindGBContext body;
 	} *cmd;
 	struct ttm_buffer_object *bo = val_buf->bo;

 	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);

 	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 	if (unlikely(cmd == NULL)) {
 		DRM_ERROR("Failed reserving FIFO space for context "
 			  "binding.\n");
 		return -ENOMEM;
 	}

 	cmd->header.id = SVGA_3D_CMD_BIND_GB_CONTEXT;
 	cmd->header.size = sizeof(cmd->body);
 	cmd->body.cid = res->id;
 	cmd->body.mobid = bo->mem.start;
 	cmd->body.validContents = res->backup_dirty;
 	res->backup_dirty = false;
 	vmw_fifo_commit(dev_priv, sizeof(*cmd));

 	return 0;
 }

 static int vmw_gb_context_unbind(struct vmw_resource *res,
 				 bool readback,
 				 struct ttm_validate_buffer *val_buf)
 {
 	struct vmw_private *dev_priv = res->dev_priv;
 	struct ttm_buffer_object *bo = val_buf->bo;
 	struct vmw_fence_obj *fence;
 	struct vmw_user_context *uctx =
 		container_of(res, struct vmw_user_context, res);

 	struct {
 		SVGA3dCmdHeader header;
 		SVGA3dCmdReadbackGBContext body;
 	} *cmd1;
 	struct {
 		SVGA3dCmdHeader header;
 		SVGA3dCmdBindGBContext body;
 	} *cmd2;
 	uint32_t submit_size;
 	uint8_t *cmd;


 	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);

 	mutex_lock(&dev_priv->binding_mutex);
 	vmw_context_binding_state_kill(&uctx->cbs);

 	submit_size = sizeof(*cmd2) + (readback ? sizeof(*cmd1) : 0);

 	cmd = vmw_fifo_reserve(dev_priv, submit_size);
 	if (unlikely(cmd == NULL)) {
 		DRM_ERROR("Failed reserving FIFO space for context "
 			  "unbinding.\n");
 		mutex_unlock(&dev_priv->binding_mutex);
 		return -ENOMEM;
 	}

 	cmd2 = (void *) cmd;
 	if (readback) {
 		cmd1 = (void *) cmd;
 		cmd1->header.id = SVGA_3D_CMD_READBACK_GB_CONTEXT;
 		cmd1->header.size = sizeof(cmd1->body);
 		cmd1->body.cid = res->id;
 		cmd2 = (void *) (&cmd1[1]);
 	}
 	cmd2->header.id = SVGA_3D_CMD_BIND_GB_CONTEXT;
 	cmd2->header.size = sizeof(cmd2->body);
 	cmd2->body.cid = res->id;
 	cmd2->body.mobid = SVGA3D_INVALID_ID;

 	vmw_fifo_commit(dev_priv, submit_size);
 	mutex_unlock(&dev_priv->binding_mutex);

 	/*
 	 * Create a fence object and fence the backup buffer.
 	 */

 	(void) vmw_execbuf_fence_commands(NULL, dev_priv,
 					  &fence, NULL);

 	vmw_fence_single_bo(bo, fence);

 	if (likely(fence != NULL))
 		vmw_fence_obj_unreference(&fence);

 	return 0;
 }

 static int vmw_gb_context_destroy(struct vmw_resource *res)
 {
 	struct vmw_private *dev_priv = res->dev_priv;
 	struct {
 		SVGA3dCmdHeader header;
 		SVGA3dCmdDestroyGBContext body;
 	} *cmd;
 	struct vmw_user_context *uctx =
 		container_of(res, struct vmw_user_context, res);

 	BUG_ON(!list_empty(&uctx->cbs.list));

 	if (likely(res->id == -1))
 		return 0;

 	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 	if (unlikely(cmd == NULL)) {
 		DRM_ERROR("Failed reserving FIFO space for context "
 			  "destruction.\n");
 		return -ENOMEM;
 	}

 	cmd->header.id = SVGA_3D_CMD_DESTROY_GB_CONTEXT;
 	cmd->header.size = sizeof(cmd->body);
 	cmd->body.cid = res->id;
 	vmw_fifo_commit(dev_priv, sizeof(*cmd));
 	if (dev_priv->query_cid == res->id)
 		dev_priv->query_cid_valid = false;
 	vmw_resource_release_id(res);
 	vmw_3d_resource_dec(dev_priv, false);

 	return 0;
 }

 /**
  * User-space context management:
  */

 static struct vmw_resource *
 vmw_user_context_base_to_res(struct ttm_base_object *base)
 {
 	return &(container_of(base, struct vmw_user_context, base)->res);
 }

 static void vmw_user_context_free(struct vmw_resource *res)
 {
 	struct vmw_user_context *ctx =
 	    container_of(res, struct vmw_user_context, res);
 	struct vmw_private *dev_priv = res->dev_priv;

 	ttm_base_object_kfree(ctx, base);
 	ttm_mem_global_free(vmw_mem_glob(dev_priv),
 			    vmw_user_context_size);
 }

 /**
  * This function is called when user space has no more references on the
  * base object. It releases the base-object's reference on the resource object.
  */

 static void vmw_user_context_base_release(struct ttm_base_object **p_base)
 {
 	struct ttm_base_object *base = *p_base;
 	struct vmw_user_context *ctx =
 	    container_of(base, struct vmw_user_context, base);
 	struct vmw_resource *res = &ctx->res;

 	*p_base = NULL;
 	vmw_resource_unreference(&res);
 }

 int vmw_context_destroy_ioctl(struct drm_device *dev, void *data,
 			      struct drm_file *file_priv)
 {
 	struct drm_vmw_context_arg *arg = (struct drm_vmw_context_arg *)data;
 	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;

 	return ttm_ref_object_base_unref(tfile, arg->cid, TTM_REF_USAGE);
 }

 int vmw_context_define_ioctl(struct drm_device *dev, void *data,
 			     struct drm_file *file_priv)
 {
 	struct vmw_private *dev_priv = vmw_priv(dev);
 	struct vmw_user_context *ctx;
 	struct vmw_resource *res;
 	struct vmw_resource *tmp;
 	struct drm_vmw_context_arg *arg = (struct drm_vmw_context_arg *)data;
 	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 	struct vmw_master *vmaster = vmw_master(file_priv->master);
 	int ret;


 	/*
 	 * Approximate idr memory usage with 128 bytes. It will be limited
 	 * by maximum number_of contexts anyway.
 	 */

 	if (unlikely(vmw_user_context_size == 0))
 		vmw_user_context_size = ttm_round_pot(sizeof(*ctx)) + 128;

 	ret = ttm_read_lock(&vmaster->lock, true);
 	if (unlikely(ret != 0))
 		return ret;

 	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
 				   vmw_user_context_size,
 				   false, true);
 	if (unlikely(ret != 0)) {
 		if (ret != -ERESTARTSYS)
 			DRM_ERROR("Out of graphics memory for context"
 				  " creation.\n");
 		goto out_unlock;
 	}

 	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 	if (unlikely(ctx == NULL)) {
 		ttm_mem_global_free(vmw_mem_glob(dev_priv),
 				    vmw_user_context_size);
 		ret = -ENOMEM;
 		goto out_unlock;
 	}

 	res = &ctx->res;
 	ctx->base.shareable = false;
 	ctx->base.tfile = NULL;

 	/*
 	 * From here on, the destructor takes over resource freeing.
 	 */

 	ret = vmw_context_init(dev_priv, res, vmw_user_context_free);
 	if (unlikely(ret != 0))
 		goto out_unlock;

 	tmp = vmw_resource_reference(&ctx->res);
 	ret = ttm_base_object_init(tfile, &ctx->base, false, VMW_RES_CONTEXT,
 				   &vmw_user_context_base_release, NULL);

 	if (unlikely(ret != 0)) {
 		vmw_resource_unreference(&tmp);
 		goto out_err;
 	}

 	arg->cid = ctx->base.hash.key;
 out_err:
 	vmw_resource_unreference(&res);
 out_unlock:
 	ttm_read_unlock(&vmaster->lock);
 	return ret;

 }

 /**
  * vmw_context_scrub_shader - scrub a shader binding from a context.
  *
  * @bi: single binding information.
  */
 static int vmw_context_scrub_shader(struct vmw_ctx_bindinfo *bi)
 {
 	struct vmw_private *dev_priv = bi->ctx->dev_priv;
 	struct {
 		SVGA3dCmdHeader header;
 		SVGA3dCmdSetShader body;
 	} *cmd;

 	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 	if (unlikely(cmd == NULL)) {
 		DRM_ERROR("Failed reserving FIFO space for shader "
 			  "unbinding.\n");
 		return -ENOMEM;
 	}

 	cmd->header.id = SVGA_3D_CMD_SET_SHADER;
 	cmd->header.size = sizeof(cmd->body);
 	cmd->body.cid = bi->ctx->id;
 	cmd->body.type = bi->i1.shader_type;
 	cmd->body.shid = SVGA3D_INVALID_ID;
 	vmw_fifo_commit(dev_priv, sizeof(*cmd));

 	return 0;
 }

 /**
  * vmw_context_scrub_render_target - scrub a render target binding
  * from a context.
  *
  * @bi: single binding information.
  */
 static int vmw_context_scrub_render_target(struct vmw_ctx_bindinfo *bi)
 {
 	struct vmw_private *dev_priv = bi->ctx->dev_priv;
 	struct {
 		SVGA3dCmdHeader header;
 		SVGA3dCmdSetRenderTarget body;
 	} *cmd;

 	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 	if (unlikely(cmd == NULL)) {
 		DRM_ERROR("Failed reserving FIFO space for render target "
 			  "unbinding.\n");
 		return -ENOMEM;
 	}

 	cmd->header.id = SVGA_3D_CMD_SETRENDERTARGET;
 	cmd->header.size = sizeof(cmd->body);
 	cmd->body.cid = bi->ctx->id;
 	cmd->body.type = bi->i1.rt_type;
 	cmd->body.target.sid = SVGA3D_INVALID_ID;
 	cmd->body.target.face = 0;
 	cmd->body.target.mipmap = 0;
 	vmw_fifo_commit(dev_priv, sizeof(*cmd));

 	return 0;
 }

 /**
  * vmw_context_scrub_texture - scrub a texture binding from a context.
  *
  * @bi: single binding information.
  *
  * TODO: Possibly complement this function with a function that takes
  * a list of texture bindings and combines them to a single command.
  */
 static int vmw_context_scrub_texture(struct vmw_ctx_bindinfo *bi)
 {
 	struct vmw_private *dev_priv = bi->ctx->dev_priv;
 	struct {
 		SVGA3dCmdHeader header;
 		struct {
 			SVGA3dCmdSetTextureState c;
 			SVGA3dTextureState s1;
 		} body;
 	} *cmd;

 	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 	if (unlikely(cmd == NULL)) {
 		DRM_ERROR("Failed reserving FIFO space for texture "
 			  "unbinding.\n");
 		return -ENOMEM;
 	}


 	cmd->header.id = SVGA_3D_CMD_SETTEXTURESTATE;
 	cmd->header.size = sizeof(cmd->body);
 	cmd->body.c.cid = bi->ctx->id;
 	cmd->body.s1.stage = bi->i1.texture_stage;
 	cmd->body.s1.name = SVGA3D_TS_BIND_TEXTURE;
 	cmd->body.s1.value = (uint32) SVGA3D_INVALID_ID;
 	vmw_fifo_commit(dev_priv, sizeof(*cmd));

 	return 0;
 }

 /**
  * vmw_context_binding_drop: Stop tracking a context binding
  *
  * @cb: Pointer to binding tracker storage.
  *
  * Stops tracking a context binding, and re-initializes its storage.
  * Typically used when the context binding is replaced with a binding to
  * another (or the same, for that matter) resource.
  */
 static void vmw_context_binding_drop(struct vmw_ctx_binding *cb)
 {
 	list_del(&cb->ctx_list);
 	if (!list_empty(&cb->res_list))
 		list_del(&cb->res_list);
 	cb->bi.ctx = NULL;
 }

 /**
  * vmw_context_binding_add: Start tracking a context binding
  *
  * @cbs: Pointer to the context binding state tracker.
  * @bi: Information about the binding to track.
  *
  * Performs basic checks on the binding to make sure arguments are within
  * bounds and then starts tracking the binding in the context binding
  * state structure @cbs.
  */
 int vmw_context_binding_add(struct vmw_ctx_binding_state *cbs,
 			    const struct vmw_ctx_bindinfo *bi)
 {
 	struct vmw_ctx_binding *loc;

 	switch (bi->bt) {
 	case vmw_ctx_binding_rt:
 		if (unlikely((unsigned)bi->i1.rt_type >= SVGA3D_RT_MAX)) {
 			DRM_ERROR("Illegal render target type %u.\n",
 				  (unsigned) bi->i1.rt_type);
 			return -EINVAL;
 		}
 		loc = &cbs->render_targets[bi->i1.rt_type];
 		break;
 	case vmw_ctx_binding_tex:
 		if (unlikely((unsigned)bi->i1.texture_stage >=
 			     SVGA3D_NUM_TEXTURE_UNITS)) {
 			DRM_ERROR("Illegal texture/sampler unit %u.\n",
 				  (unsigned) bi->i1.texture_stage);
 			return -EINVAL;
 		}
 		loc = &cbs->texture_units[bi->i1.texture_stage];
 		break;
 	case vmw_ctx_binding_shader:
 		if (unlikely((unsigned)bi->i1.shader_type >=
 			     SVGA3D_SHADERTYPE_MAX)) {
 			DRM_ERROR("Illegal shader type %u.\n",
 				  (unsigned) bi->i1.shader_type);
 			return -EINVAL;
 		}
 		loc = &cbs->shaders[bi->i1.shader_type];
 		break;
 	default:
 		BUG();
 	}

 	if (loc->bi.ctx != NULL)
 		vmw_context_binding_drop(loc);

 	loc->bi = *bi;
 	list_add_tail(&loc->ctx_list, &cbs->list);
 	INIT_LIST_HEAD(&loc->res_list);

 	return 0;
 }

 /**
  * vmw_context_binding_transfer: Transfer a context binding tracking entry.
  *
  * @cbs: Pointer to the persistent context binding state tracker.
  * @bi: Information about the binding to track.
  *
  */
 static void vmw_context_binding_transfer(struct vmw_ctx_binding_state *cbs,
 					 const struct vmw_ctx_bindinfo *bi)
 {
 	struct vmw_ctx_binding *loc;

 	switch (bi->bt) {
 	case vmw_ctx_binding_rt:
 		loc = &cbs->render_targets[bi->i1.rt_type];
 		break;
 	case vmw_ctx_binding_tex:
 		loc = &cbs->texture_units[bi->i1.texture_stage];
 		break;
 	case vmw_ctx_binding_shader:
 		loc = &cbs->shaders[bi->i1.shader_type];
 		break;
 	default:
 		BUG();
 	}

 	if (loc->bi.ctx != NULL)
 		vmw_context_binding_drop(loc);

 	loc->bi = *bi;
 	list_add_tail(&loc->ctx_list, &cbs->list);
 	if (bi->res != NULL)
 		list_add_tail(&loc->res_list, &bi->res->binding_head);
 	else
 		INIT_LIST_HEAD(&loc->res_list);
 }

 /**
  * vmw_context_binding_kill - Kill a binding on the device
  * and stop tracking it.
  *
  * @cb: Pointer to binding tracker storage.
  *
  * Emits FIFO commands to scrub a binding represented by @cb.
  * Then stops tracking the binding and re-initializes its storage.
  */
 static void vmw_context_binding_kill(struct vmw_ctx_binding *cb)
 {
 	(void) vmw_scrub_funcs[cb->bi.bt](&cb->bi);
 	vmw_context_binding_drop(cb);
 }

 /**
  * vmw_context_binding_state_kill - Kill all bindings associated with a
  * struct vmw_ctx_binding state structure, and re-initialize the structure.
  *
  * @cbs: Pointer to the context binding state tracker.
  *
  * Emits commands to scrub all bindings associated with the
  * context binding state tracker. Then re-initializes the whole structure.
  */
 static void vmw_context_binding_state_kill(struct vmw_ctx_binding_state *cbs)
 {
 	struct vmw_ctx_binding *entry, *next;

 	list_for_each_entry_safe(entry, next, &cbs->list, ctx_list)
 		vmw_context_binding_kill(entry);
 }

 /**
  * vmw_context_binding_res_list_kill - Kill all bindings on a
  * resource binding list
  *
  * @head: list head of resource binding list
  *
  * Kills all bindings associated with a specific resource. Typically
  * called before the resource is destroyed.
  */
 void vmw_context_binding_res_list_kill(struct list_head *head)
 {
 	struct vmw_ctx_binding *entry, *next;

 	list_for_each_entry_safe(entry, next, head, res_list)
 		vmw_context_binding_kill(entry);
 }

 /**
  * vmw_context_binding_state_transfer - Commit staged binding info
  *
  * @ctx: Pointer to context to commit the staged binding info to.
  * @from: Staged binding info built during execbuf.
  *
  * Transfers binding info from a temporary structure to the persistent
  * structure in the context. This can be done once commands
  */
 void vmw_context_binding_state_transfer(struct vmw_resource *ctx,
 					struct vmw_ctx_binding_state *from)
 {
 	struct vmw_user_context *uctx =
 		container_of(ctx, struct vmw_user_context, res);
 	struct vmw_ctx_binding *entry, *next;

 	list_for_each_entry_safe(entry, next, &from->list, ctx_list)
 		vmw_context_binding_transfer(&uctx->cbs, &entry->bi);
 }
	/**************************************************************************
	*
	* 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 "ttm/ttm_placement.h"

	struct vmw_user_context {
	struct ttm_base_object base;
	struct vmw_resource res;
	struct vmw_ctx_binding_state cbs;
	};



	typedef int (vmw_scrub_func)(struct vmw_ctx_bindinfo );

	static void vmw_user_context_free(struct vmw_resource *res);
	static struct vmw_resource *
	vmw_user_context_base_to_res(struct ttm_base_object *base);

	static int vmw_gb_context_create(struct vmw_resource *res);
	static int vmw_gb_context_bind(struct vmw_resource *res,
	struct ttm_validate_buffer *val_buf);
	static int vmw_gb_context_unbind(struct vmw_resource *res,
	bool readback,
	struct ttm_validate_buffer *val_buf);
	static int vmw_gb_context_destroy(struct vmw_resource *res);
	static int vmw_context_scrub_shader(struct vmw_ctx_bindinfo *bi);
	static int vmw_context_scrub_render_target(struct vmw_ctx_bindinfo *bi);
	static int vmw_context_scrub_texture(struct vmw_ctx_bindinfo *bi);
	static void vmw_context_binding_state_kill(struct vmw_ctx_binding_state *cbs);
	static uint64_t vmw_user_context_size;

	static const struct vmw_user_resource_conv user_context_conv = {
	.object_type = VMW_RES_CONTEXT,
	.base_obj_to_res = vmw_user_context_base_to_res,
	.res_free = vmw_user_context_free
	};

	const struct vmw_user_resource_conv *user_context_converter =
	&user_context_conv;


	static const struct vmw_res_func vmw_legacy_context_func = {
	.res_type = vmw_res_context,
	.needs_backup = false,
	.may_evict = false,
	.type_name = "legacy contexts",
	.backup_placement = NULL,
	.create = NULL,
	.destroy = NULL,
	.bind = NULL,
	.unbind = NULL
	};

	static const struct vmw_res_func vmw_gb_context_func = {
	.res_type = vmw_res_context,
	.needs_backup = true,
	.may_evict = true,
	.type_name = "guest backed contexts",
	.backup_placement = &vmw_mob_placement,
	.create = vmw_gb_context_create,
	.destroy = vmw_gb_context_destroy,
	.bind = vmw_gb_context_bind,
	.unbind = vmw_gb_context_unbind
	};

	static const vmw_scrub_func vmw_scrub_funcs[vmw_ctx_binding_max] = {
	[vmw_ctx_binding_shader] = vmw_context_scrub_shader,
	[vmw_ctx_binding_rt] = vmw_context_scrub_render_target,
	[vmw_ctx_binding_tex] = vmw_context_scrub_texture };

	/**
	* Context management:
	*/

	static void vmw_hw_context_destroy(struct vmw_resource *res)
	{

	struct vmw_private *dev_priv = res->dev_priv;
	struct {
	SVGA3dCmdHeader header;
	SVGA3dCmdDestroyContext body;
	} *cmd;


	if (res->func->destroy == vmw_gb_context_destroy) {
	mutex_lock(&dev_priv->cmdbuf_mutex);
	(void) vmw_gb_context_destroy(res);
	if (dev_priv->pinned_bo != NULL &&
	!dev_priv->query_cid_valid)
	__vmw_execbuf_release_pinned_bo(dev_priv, NULL);
	mutex_unlock(&dev_priv->cmdbuf_mutex);
	return;
	}

	vmw_execbuf_release_pinned_bo(dev_priv);
	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
	DRM_ERROR("Failed reserving FIFO space for surface "
	"destruction.\n");
	return;
	}

	cmd->header.id = cpu_to_le32(SVGA_3D_CMD_CONTEXT_DESTROY);
	cmd->header.size = cpu_to_le32(sizeof(cmd->body));
	cmd->body.cid = cpu_to_le32(res->id);

	vmw_fifo_commit(dev_priv, sizeof(*cmd));
	vmw_3d_resource_dec(dev_priv, false);
	}

	static int vmw_gb_context_init(struct vmw_private *dev_priv,
	struct vmw_resource *res,
	void (res_free) (struct vmw_resource res))
	{
	int ret;
	struct vmw_user_context *uctx =
	container_of(res, struct vmw_user_context, res);

	ret = vmw_resource_init(dev_priv, res, true,
	res_free, &vmw_gb_context_func);
	res->backup_size = SVGA3D_CONTEXT_DATA_SIZE;

	if (unlikely(ret != 0)) {
	if (res_free)
	res_free(res);
	else
	kfree(res);
	return ret;
	}

	memset(&uctx->cbs, 0, sizeof(uctx->cbs));
	INIT_LIST_HEAD(&uctx->cbs.list);

	vmw_resource_activate(res, vmw_hw_context_destroy);
	return 0;
	}

	static int vmw_context_init(struct vmw_private *dev_priv,
	struct vmw_resource *res,
	void (res_free) (struct vmw_resource res))
	{
	int ret;

	struct {
	SVGA3dCmdHeader header;
	SVGA3dCmdDefineContext body;
	} *cmd;

	if (dev_priv->has_mob)
	return vmw_gb_context_init(dev_priv, res, res_free);

	ret = vmw_resource_init(dev_priv, res, false,
	res_free, &vmw_legacy_context_func);

	if (unlikely(ret != 0)) {
	DRM_ERROR("Failed to allocate a resource id.\n");
	goto out_early;
	}

	if (unlikely(res->id >= SVGA3D_MAX_CONTEXT_IDS)) {
	DRM_ERROR("Out of hw context ids.\n");
	vmw_resource_unreference(&res);
	return -ENOMEM;
	}

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
	DRM_ERROR("Fifo reserve failed.\n");
	vmw_resource_unreference(&res);
	return -ENOMEM;
	}

	cmd->header.id = cpu_to_le32(SVGA_3D_CMD_CONTEXT_DEFINE);
	cmd->header.size = cpu_to_le32(sizeof(cmd->body));
	cmd->body.cid = cpu_to_le32(res->id);

	vmw_fifo_commit(dev_priv, sizeof(*cmd));
	(void) vmw_3d_resource_inc(dev_priv, false);
	vmw_resource_activate(res, vmw_hw_context_destroy);
	return 0;

	out_early:
	if (res_free == NULL)
	kfree(res);
	else
	res_free(res);
	return ret;
	}

	struct vmw_resource vmw_context_alloc(struct vmw_private dev_priv)
	{
	struct vmw_resource res = kmalloc(sizeof(res), GFP_KERNEL);
	int ret;

	if (unlikely(res == NULL))
	return NULL;

	ret = vmw_context_init(dev_priv, res, NULL);

	return (ret == 0) ? res : NULL;
	}


	static int vmw_gb_context_create(struct vmw_resource *res)
	{
	struct vmw_private *dev_priv = res->dev_priv;
	int ret;
	struct {
	SVGA3dCmdHeader header;
	SVGA3dCmdDefineGBContext body;
	} *cmd;

	if (likely(res->id != -1))
	return 0;

	ret = vmw_resource_alloc_id(res);
	if (unlikely(ret != 0)) {
	DRM_ERROR("Failed to allocate a context id.\n");
	goto out_no_id;
	}

	if (unlikely(res->id >= VMWGFX_NUM_GB_CONTEXT)) {
	ret = -EBUSY;
	goto out_no_fifo;
	}

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
	DRM_ERROR("Failed reserving FIFO space for context "
	"creation.\n");
	ret = -ENOMEM;
	goto out_no_fifo;
	}

	cmd->header.id = SVGA_3D_CMD_DEFINE_GB_CONTEXT;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.cid = res->id;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));
	(void) vmw_3d_resource_inc(dev_priv, false);

	return 0;

	out_no_fifo:
	vmw_resource_release_id(res);
	out_no_id:
	return ret;
	}

	static int vmw_gb_context_bind(struct vmw_resource *res,
	struct ttm_validate_buffer *val_buf)
	{
	struct vmw_private *dev_priv = res->dev_priv;
	struct {
	SVGA3dCmdHeader header;
	SVGA3dCmdBindGBContext body;
	} *cmd;
	struct ttm_buffer_object *bo = val_buf->bo;

	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
	DRM_ERROR("Failed reserving FIFO space for context "
	"binding.\n");
	return -ENOMEM;
	}

	cmd->header.id = SVGA_3D_CMD_BIND_GB_CONTEXT;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.cid = res->id;
	cmd->body.mobid = bo->mem.start;
	cmd->body.validContents = res->backup_dirty;
	res->backup_dirty = false;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	return 0;
	}

	static int vmw_gb_context_unbind(struct vmw_resource *res,
	bool readback,
	struct ttm_validate_buffer *val_buf)
	{
	struct vmw_private *dev_priv = res->dev_priv;
	struct ttm_buffer_object *bo = val_buf->bo;
	struct vmw_fence_obj *fence;
	struct vmw_user_context *uctx =
	container_of(res, struct vmw_user_context, res);

	struct {
	SVGA3dCmdHeader header;
	SVGA3dCmdReadbackGBContext body;
	} *cmd1;
	struct {
	SVGA3dCmdHeader header;
	SVGA3dCmdBindGBContext body;
	} *cmd2;
	uint32_t submit_size;
	uint8_t *cmd;


	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);

	mutex_lock(&dev_priv->binding_mutex);
	vmw_context_binding_state_kill(&uctx->cbs);

	submit_size = sizeof(cmd2) + (readback ? sizeof(cmd1) : 0);

	cmd = vmw_fifo_reserve(dev_priv, submit_size);
	if (unlikely(cmd == NULL)) {
	DRM_ERROR("Failed reserving FIFO space for context "
	"unbinding.\n");
	mutex_unlock(&dev_priv->binding_mutex);
	return -ENOMEM;
	}

	cmd2 = (void *) cmd;
	if (readback) {
	cmd1 = (void *) cmd;
	cmd1->header.id = SVGA_3D_CMD_READBACK_GB_CONTEXT;
	cmd1->header.size = sizeof(cmd1->body);
	cmd1->body.cid = res->id;
	cmd2 = (void *) (&cmd1[1]);
	}
	cmd2->header.id = SVGA_3D_CMD_BIND_GB_CONTEXT;
	cmd2->header.size = sizeof(cmd2->body);
	cmd2->body.cid = res->id;
	cmd2->body.mobid = SVGA3D_INVALID_ID;

	vmw_fifo_commit(dev_priv, submit_size);
	mutex_unlock(&dev_priv->binding_mutex);

	/*
	* Create a fence object and fence the backup buffer.
	*/

	(void) vmw_execbuf_fence_commands(NULL, dev_priv,
	&fence, NULL);

	vmw_fence_single_bo(bo, fence);

	if (likely(fence != NULL))
	vmw_fence_obj_unreference(&fence);

	return 0;
	}

	static int vmw_gb_context_destroy(struct vmw_resource *res)
	{
	struct vmw_private *dev_priv = res->dev_priv;
	struct {
	SVGA3dCmdHeader header;
	SVGA3dCmdDestroyGBContext body;
	} *cmd;
	struct vmw_user_context *uctx =
	container_of(res, struct vmw_user_context, res);

	BUG_ON(!list_empty(&uctx->cbs.list));

	if (likely(res->id == -1))
	return 0;

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
	DRM_ERROR("Failed reserving FIFO space for context "
	"destruction.\n");
	return -ENOMEM;
	}

	cmd->header.id = SVGA_3D_CMD_DESTROY_GB_CONTEXT;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.cid = res->id;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));
	if (dev_priv->query_cid == res->id)
	dev_priv->query_cid_valid = false;
	vmw_resource_release_id(res);
	vmw_3d_resource_dec(dev_priv, false);

	return 0;
	}

	/**
	* User-space context management:
	*/

	static struct vmw_resource *
	vmw_user_context_base_to_res(struct ttm_base_object *base)
	{
	return &(container_of(base, struct vmw_user_context, base)->res);
	}

	static void vmw_user_context_free(struct vmw_resource *res)
	{
	struct vmw_user_context *ctx =
	container_of(res, struct vmw_user_context, res);
	struct vmw_private *dev_priv = res->dev_priv;

	ttm_base_object_kfree(ctx, base);
	ttm_mem_global_free(vmw_mem_glob(dev_priv),
	vmw_user_context_size);
	}

	/**
	* This function is called when user space has no more references on the
	* base object. It releases the base-object's reference on the resource object.
	*/

	static void vmw_user_context_base_release(struct ttm_base_object **p_base)
	{
	struct ttm_base_object base = p_base;
	struct vmw_user_context *ctx =
	container_of(base, struct vmw_user_context, base);
	struct vmw_resource *res = &ctx->res;

	*p_base = NULL;
	vmw_resource_unreference(&res);
	}

	int vmw_context_destroy_ioctl(struct drm_device dev, void data,
	struct drm_file *file_priv)
	{
	struct drm_vmw_context_arg arg = (struct drm_vmw_context_arg )data;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;

	return ttm_ref_object_base_unref(tfile, arg->cid, TTM_REF_USAGE);
	}

	int vmw_context_define_ioctl(struct drm_device dev, void data,
	struct drm_file *file_priv)
	{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct vmw_user_context *ctx;
	struct vmw_resource *res;
	struct vmw_resource *tmp;
	struct drm_vmw_context_arg arg = (struct drm_vmw_context_arg )data;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	struct vmw_master *vmaster = vmw_master(file_priv->master);
	int ret;


	/*
	* Approximate idr memory usage with 128 bytes. It will be limited
	* by maximum number_of contexts anyway.
	*/

	if (unlikely(vmw_user_context_size == 0))
	vmw_user_context_size = ttm_round_pot(sizeof(*ctx)) + 128;

	ret = ttm_read_lock(&vmaster->lock, true);
	if (unlikely(ret != 0))
	return ret;

	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
	vmw_user_context_size,
	false, true);
	if (unlikely(ret != 0)) {
	if (ret != -ERESTARTSYS)
	DRM_ERROR("Out of graphics memory for context"
	" creation.\n");
	goto out_unlock;
	}

	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
	if (unlikely(ctx == NULL)) {
	ttm_mem_global_free(vmw_mem_glob(dev_priv),
	vmw_user_context_size);
	ret = -ENOMEM;
	goto out_unlock;
	}

	res = &ctx->res;
	ctx->base.shareable = false;
	ctx->base.tfile = NULL;

	/*
	* From here on, the destructor takes over resource freeing.
	*/

	ret = vmw_context_init(dev_priv, res, vmw_user_context_free);
	if (unlikely(ret != 0))
	goto out_unlock;

	tmp = vmw_resource_reference(&ctx->res);
	ret = ttm_base_object_init(tfile, &ctx->base, false, VMW_RES_CONTEXT,
	&vmw_user_context_base_release, NULL);

	if (unlikely(ret != 0)) {
	vmw_resource_unreference(&tmp);
	goto out_err;
	}

	arg->cid = ctx->base.hash.key;
	out_err:
	vmw_resource_unreference(&res);
	out_unlock:
	ttm_read_unlock(&vmaster->lock);
	return ret;

	}

	/**
	* vmw_context_scrub_shader - scrub a shader binding from a context.
	*
	* @bi: single binding information.
	*/
	static int vmw_context_scrub_shader(struct vmw_ctx_bindinfo *bi)
	{
	struct vmw_private *dev_priv = bi->ctx->dev_priv;
	struct {
	SVGA3dCmdHeader header;
	SVGA3dCmdSetShader body;
	} *cmd;

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
	DRM_ERROR("Failed reserving FIFO space for shader "
	"unbinding.\n");
	return -ENOMEM;
	}

	cmd->header.id = SVGA_3D_CMD_SET_SHADER;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.cid = bi->ctx->id;
	cmd->body.type = bi->i1.shader_type;
	cmd->body.shid = SVGA3D_INVALID_ID;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	return 0;
	}

	/**
	* vmw_context_scrub_render_target - scrub a render target binding
	* from a context.
	*
	* @bi: single binding information.
	*/
	static int vmw_context_scrub_render_target(struct vmw_ctx_bindinfo *bi)
	{
	struct vmw_private *dev_priv = bi->ctx->dev_priv;
	struct {
	SVGA3dCmdHeader header;
	SVGA3dCmdSetRenderTarget body;
	} *cmd;

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
	DRM_ERROR("Failed reserving FIFO space for render target "
	"unbinding.\n");
	return -ENOMEM;
	}

	cmd->header.id = SVGA_3D_CMD_SETRENDERTARGET;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.cid = bi->ctx->id;
	cmd->body.type = bi->i1.rt_type;
	cmd->body.target.sid = SVGA3D_INVALID_ID;
	cmd->body.target.face = 0;
	cmd->body.target.mipmap = 0;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	return 0;
	}

	/**
	* vmw_context_scrub_texture - scrub a texture binding from a context.
	*
	* @bi: single binding information.
	*
	* TODO: Possibly complement this function with a function that takes
	* a list of texture bindings and combines them to a single command.
	*/
	static int vmw_context_scrub_texture(struct vmw_ctx_bindinfo *bi)
	{
	struct vmw_private *dev_priv = bi->ctx->dev_priv;
	struct {
	SVGA3dCmdHeader header;
	struct {
	SVGA3dCmdSetTextureState c;
	SVGA3dTextureState s1;
	} body;
	} *cmd;

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
	DRM_ERROR("Failed reserving FIFO space for texture "
	"unbinding.\n");
	return -ENOMEM;
	}


	cmd->header.id = SVGA_3D_CMD_SETTEXTURESTATE;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.c.cid = bi->ctx->id;
	cmd->body.s1.stage = bi->i1.texture_stage;
	cmd->body.s1.name = SVGA3D_TS_BIND_TEXTURE;
	cmd->body.s1.value = (uint32) SVGA3D_INVALID_ID;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	return 0;
	}

	/**
	* vmw_context_binding_drop: Stop tracking a context binding
	*
	* @cb: Pointer to binding tracker storage.
	*
	* Stops tracking a context binding, and re-initializes its storage.
	* Typically used when the context binding is replaced with a binding to
	* another (or the same, for that matter) resource.
	*/
	static void vmw_context_binding_drop(struct vmw_ctx_binding *cb)
	{
	list_del(&cb->ctx_list);
	if (!list_empty(&cb->res_list))
	list_del(&cb->res_list);
	cb->bi.ctx = NULL;
	}

	/**
	* vmw_context_binding_add: Start tracking a context binding
	*
	* @cbs: Pointer to the context binding state tracker.
	* @bi: Information about the binding to track.
	*
	* Performs basic checks on the binding to make sure arguments are within
	* bounds and then starts tracking the binding in the context binding
	* state structure @cbs.
	*/
	int vmw_context_binding_add(struct vmw_ctx_binding_state *cbs,
	const struct vmw_ctx_bindinfo *bi)
	{
	struct vmw_ctx_binding *loc;

	switch (bi->bt) {
	case vmw_ctx_binding_rt:
	if (unlikely((unsigned)bi->i1.rt_type >= SVGA3D_RT_MAX)) {
	DRM_ERROR("Illegal render target type %u.\n",
	(unsigned) bi->i1.rt_type);
	return -EINVAL;
	}
	loc = &cbs->render_targets[bi->i1.rt_type];
	break;
	case vmw_ctx_binding_tex:
	if (unlikely((unsigned)bi->i1.texture_stage >=
	SVGA3D_NUM_TEXTURE_UNITS)) {
	DRM_ERROR("Illegal texture/sampler unit %u.\n",
	(unsigned) bi->i1.texture_stage);
	return -EINVAL;
	}
	loc = &cbs->texture_units[bi->i1.texture_stage];
	break;
	case vmw_ctx_binding_shader:
	if (unlikely((unsigned)bi->i1.shader_type >=
	SVGA3D_SHADERTYPE_MAX)) {
	DRM_ERROR("Illegal shader type %u.\n",
	(unsigned) bi->i1.shader_type);
	return -EINVAL;
	}
	loc = &cbs->shaders[bi->i1.shader_type];
	break;
	default:
	BUG();
	}

	if (loc->bi.ctx != NULL)
	vmw_context_binding_drop(loc);

	loc->bi = *bi;
	list_add_tail(&loc->ctx_list, &cbs->list);
	INIT_LIST_HEAD(&loc->res_list);

	return 0;
	}

	/**
	* vmw_context_binding_transfer: Transfer a context binding tracking entry.
	*
	* @cbs: Pointer to the persistent context binding state tracker.
	* @bi: Information about the binding to track.
	*
	*/
	static void vmw_context_binding_transfer(struct vmw_ctx_binding_state *cbs,
	const struct vmw_ctx_bindinfo *bi)
	{
	struct vmw_ctx_binding *loc;

	switch (bi->bt) {
	case vmw_ctx_binding_rt:
	loc = &cbs->render_targets[bi->i1.rt_type];
	break;
	case vmw_ctx_binding_tex:
	loc = &cbs->texture_units[bi->i1.texture_stage];
	break;
	case vmw_ctx_binding_shader:
	loc = &cbs->shaders[bi->i1.shader_type];
	break;
	default:
	BUG();
	}

	if (loc->bi.ctx != NULL)
	vmw_context_binding_drop(loc);

	loc->bi = *bi;
	list_add_tail(&loc->ctx_list, &cbs->list);
	if (bi->res != NULL)
	list_add_tail(&loc->res_list, &bi->res->binding_head);
	else
	INIT_LIST_HEAD(&loc->res_list);
	}

	/**
	* vmw_context_binding_kill - Kill a binding on the device
	* and stop tracking it.
	*
	* @cb: Pointer to binding tracker storage.
	*
	* Emits FIFO commands to scrub a binding represented by @cb.
	* Then stops tracking the binding and re-initializes its storage.
	*/
	static void vmw_context_binding_kill(struct vmw_ctx_binding *cb)
	{
	(void) vmw_scrub_funcs[cb->bi.bt](&cb->bi);
	vmw_context_binding_drop(cb);
	}

	/**
	* vmw_context_binding_state_kill - Kill all bindings associated with a
	* struct vmw_ctx_binding state structure, and re-initialize the structure.
	*
	* @cbs: Pointer to the context binding state tracker.
	*
	* Emits commands to scrub all bindings associated with the
	* context binding state tracker. Then re-initializes the whole structure.
	*/
	static void vmw_context_binding_state_kill(struct vmw_ctx_binding_state *cbs)
	{
	struct vmw_ctx_binding entry, next;

	list_for_each_entry_safe(entry, next, &cbs->list, ctx_list)
	vmw_context_binding_kill(entry);
	}

	/**
	* vmw_context_binding_res_list_kill - Kill all bindings on a
	* resource binding list
	*
	* @head: list head of resource binding list
	*
	* Kills all bindings associated with a specific resource. Typically
	* called before the resource is destroyed.
	*/
	void vmw_context_binding_res_list_kill(struct list_head *head)
	{
	struct vmw_ctx_binding entry, next;

	list_for_each_entry_safe(entry, next, head, res_list)
	vmw_context_binding_kill(entry);
	}

	/**
	* vmw_context_binding_state_transfer - Commit staged binding info
	*
	* @ctx: Pointer to context to commit the staged binding info to.
	* @from: Staged binding info built during execbuf.
	*
	* Transfers binding info from a temporary structure to the persistent
	* structure in the context. This can be done once commands
	*/
	void vmw_context_binding_state_transfer(struct vmw_resource *ctx,
	struct vmw_ctx_binding_state *from)
	{
	struct vmw_user_context *uctx =
	container_of(ctx, struct vmw_user_context, res);
	struct vmw_ctx_binding entry, next;

	list_for_each_entry_safe(entry, next, &from->list, ctx_list)
	vmw_context_binding_transfer(&uctx->cbs, &entry->bi);
	}