drivers/gpu/drm/vmwgfx/vmwgfx_shader.c - maze/linux - Git at Google

 /**************************************************************************
  *
  * 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_shader {
 	struct vmw_resource res;
 	SVGA3dShaderType type;
 	uint32_t size;
 };

 struct vmw_user_shader {
 	struct ttm_base_object base;
 	struct vmw_shader shader;
 };

 static void vmw_user_shader_free(struct vmw_resource *res);
 static struct vmw_resource *
 vmw_user_shader_base_to_res(struct ttm_base_object *base);

 static int vmw_gb_shader_create(struct vmw_resource *res);
 static int vmw_gb_shader_bind(struct vmw_resource *res,
 			       struct ttm_validate_buffer *val_buf);
 static int vmw_gb_shader_unbind(struct vmw_resource *res,
 				 bool readback,
 				 struct ttm_validate_buffer *val_buf);
 static int vmw_gb_shader_destroy(struct vmw_resource *res);

 static uint64_t vmw_user_shader_size;

 static const struct vmw_user_resource_conv user_shader_conv = {
 	.object_type = VMW_RES_SHADER,
 	.base_obj_to_res = vmw_user_shader_base_to_res,
 	.res_free = vmw_user_shader_free
 };

 const struct vmw_user_resource_conv *user_shader_converter =
 	&user_shader_conv;


 static const struct vmw_res_func vmw_gb_shader_func = {
 	.res_type = vmw_res_shader,
 	.needs_backup = true,
 	.may_evict = true,
 	.type_name = "guest backed shaders",
 	.backup_placement = &vmw_mob_placement,
 	.create = vmw_gb_shader_create,
 	.destroy = vmw_gb_shader_destroy,
 	.bind = vmw_gb_shader_bind,
 	.unbind = vmw_gb_shader_unbind
 };

 /**
  * Shader management:
  */

 static inline struct vmw_shader *
 vmw_res_to_shader(struct vmw_resource *res)
 {
 	return container_of(res, struct vmw_shader, res);
 }

 static void vmw_hw_shader_destroy(struct vmw_resource *res)
 {
 	(void) vmw_gb_shader_destroy(res);
 }

 static int vmw_gb_shader_init(struct vmw_private *dev_priv,
 			      struct vmw_resource *res,
 			      uint32_t size,
 			      uint64_t offset,
 			      SVGA3dShaderType type,
 			      struct vmw_dma_buffer *byte_code,
 			      void (*res_free) (struct vmw_resource *res))
 {
 	struct vmw_shader *shader = vmw_res_to_shader(res);
 	int ret;

 	ret = vmw_resource_init(dev_priv, res, true,
 				res_free, &vmw_gb_shader_func);


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

 	res->backup_size = size;
 	if (byte_code) {
 		res->backup = vmw_dmabuf_reference(byte_code);
 		res->backup_offset = offset;
 	}
 	shader->size = size;
 	shader->type = type;

 	vmw_resource_activate(res, vmw_hw_shader_destroy);
 	return 0;
 }

 static int vmw_gb_shader_create(struct vmw_resource *res)
 {
 	struct vmw_private *dev_priv = res->dev_priv;
 	struct vmw_shader *shader = vmw_res_to_shader(res);
 	int ret;
 	struct {
 		SVGA3dCmdHeader header;
 		SVGA3dCmdDefineGBShader 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 shader id.\n");
 		goto out_no_id;
 	}

 	if (unlikely(res->id >= VMWGFX_NUM_GB_SHADER)) {
 		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 shader "
 			  "creation.\n");
 		ret = -ENOMEM;
 		goto out_no_fifo;
 	}

 	cmd->header.id = SVGA_3D_CMD_DEFINE_GB_SHADER;
 	cmd->header.size = sizeof(cmd->body);
 	cmd->body.shid = res->id;
 	cmd->body.type = shader->type;
 	cmd->body.sizeInBytes = shader->size;
 	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_shader_bind(struct vmw_resource *res,
 			      struct ttm_validate_buffer *val_buf)
 {
 	struct vmw_private *dev_priv = res->dev_priv;
 	struct {
 		SVGA3dCmdHeader header;
 		SVGA3dCmdBindGBShader 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 shader "
 			  "binding.\n");
 		return -ENOMEM;
 	}

 	cmd->header.id = SVGA_3D_CMD_BIND_GB_SHADER;
 	cmd->header.size = sizeof(cmd->body);
 	cmd->body.shid = res->id;
 	cmd->body.mobid = bo->mem.start;
 	cmd->body.offsetInBytes = 0;
 	res->backup_dirty = false;
 	vmw_fifo_commit(dev_priv, sizeof(*cmd));

 	return 0;
 }

 static int vmw_gb_shader_unbind(struct vmw_resource *res,
 				bool readback,
 				struct ttm_validate_buffer *val_buf)
 {
 	struct vmw_private *dev_priv = res->dev_priv;
 	struct {
 		SVGA3dCmdHeader header;
 		SVGA3dCmdBindGBShader body;
 	} *cmd;
 	struct vmw_fence_obj *fence;

 	BUG_ON(res->backup->base.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 shader "
 			  "unbinding.\n");
 		return -ENOMEM;
 	}

 	cmd->header.id = SVGA_3D_CMD_BIND_GB_SHADER;
 	cmd->header.size = sizeof(cmd->body);
 	cmd->body.shid = res->id;
 	cmd->body.mobid = SVGA3D_INVALID_ID;
 	cmd->body.offsetInBytes = 0;
 	vmw_fifo_commit(dev_priv, sizeof(*cmd));

 	/*
 	 * 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;
 }

 static int vmw_gb_shader_destroy(struct vmw_resource *res)
 {
 	struct vmw_private *dev_priv = res->dev_priv;
 	struct {
 		SVGA3dCmdHeader header;
 		SVGA3dCmdDestroyGBShader body;
 	} *cmd;

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

 	mutex_lock(&dev_priv->binding_mutex);
 	vmw_context_binding_res_list_kill(&res->binding_head);

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

 	cmd->header.id = SVGA_3D_CMD_DESTROY_GB_SHADER;
 	cmd->header.size = sizeof(cmd->body);
 	cmd->body.shid = res->id;
 	vmw_fifo_commit(dev_priv, sizeof(*cmd));
 	mutex_unlock(&dev_priv->binding_mutex);
 	vmw_resource_release_id(res);
 	vmw_3d_resource_dec(dev_priv, false);

 	return 0;
 }

 /**
  * User-space shader management:
  */

 static struct vmw_resource *
 vmw_user_shader_base_to_res(struct ttm_base_object *base)
 {
 	return &(container_of(base, struct vmw_user_shader, base)->
 		 shader.res);
 }

 static void vmw_user_shader_free(struct vmw_resource *res)
 {
 	struct vmw_user_shader *ushader =
 		container_of(res, struct vmw_user_shader, shader.res);
 	struct vmw_private *dev_priv = res->dev_priv;

 	ttm_base_object_kfree(ushader, base);
 	ttm_mem_global_free(vmw_mem_glob(dev_priv),
 			    vmw_user_shader_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_shader_base_release(struct ttm_base_object **p_base)
 {
 	struct ttm_base_object *base = *p_base;
 	struct vmw_resource *res = vmw_user_shader_base_to_res(base);

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

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

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

 int vmw_shader_define_ioctl(struct drm_device *dev, void *data,
 			     struct drm_file *file_priv)
 {
 	struct vmw_private *dev_priv = vmw_priv(dev);
 	struct vmw_user_shader *ushader;
 	struct vmw_resource *res;
 	struct vmw_resource *tmp;
 	struct drm_vmw_shader_create_arg *arg =
 		(struct drm_vmw_shader_create_arg *)data;
 	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 	struct vmw_master *vmaster = vmw_master(file_priv->master);
 	struct vmw_dma_buffer *buffer = NULL;
 	SVGA3dShaderType shader_type;
 	int ret;

 	if (arg->buffer_handle != SVGA3D_INVALID_ID) {
 		ret = vmw_user_dmabuf_lookup(tfile, arg->buffer_handle,
 					     &buffer);
 		if (unlikely(ret != 0)) {
 			DRM_ERROR("Could not find buffer for shader "
 				  "creation.\n");
 			return ret;
 		}

 		if ((u64)buffer->base.num_pages * PAGE_SIZE <
 		    (u64)arg->size + (u64)arg->offset) {
 			DRM_ERROR("Illegal buffer- or shader size.\n");
 			ret = -EINVAL;
 			goto out_bad_arg;
 		}
 	}

 	switch (arg->shader_type) {
 	case drm_vmw_shader_type_vs:
 		shader_type = SVGA3D_SHADERTYPE_VS;
 		break;
 	case drm_vmw_shader_type_ps:
 		shader_type = SVGA3D_SHADERTYPE_PS;
 		break;
 	case drm_vmw_shader_type_gs:
 		shader_type = SVGA3D_SHADERTYPE_GS;
 		break;
 	default:
 		DRM_ERROR("Illegal shader type.\n");
 		ret = -EINVAL;
 		goto out_bad_arg;
 	}

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

 	if (unlikely(vmw_user_shader_size == 0))
 		vmw_user_shader_size = ttm_round_pot(sizeof(*ushader))
 			+ 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_shader_size,
 				   false, true);
 	if (unlikely(ret != 0)) {
 		if (ret != -ERESTARTSYS)
 			DRM_ERROR("Out of graphics memory for shader"
 				  " creation.\n");
 		goto out_unlock;
 	}

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

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

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

 	ret = vmw_gb_shader_init(dev_priv, res, arg->size,
 				 arg->offset, shader_type, buffer,
 				 vmw_user_shader_free);
 	if (unlikely(ret != 0))
 		goto out_unlock;

 	tmp = vmw_resource_reference(res);
 	ret = ttm_base_object_init(tfile, &ushader->base, false,
 				   VMW_RES_SHADER,
 				   &vmw_user_shader_base_release, NULL);

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

 	arg->shader_handle = ushader->base.hash.key;
 out_err:
 	vmw_resource_unreference(&res);
 out_unlock:
 	ttm_read_unlock(&vmaster->lock);
 out_bad_arg:
 	vmw_dmabuf_unreference(&buffer);

 	return ret;

 }
	/**************************************************************************
	*
	* 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_shader {
	struct vmw_resource res;
	SVGA3dShaderType type;
	uint32_t size;
	};

	struct vmw_user_shader {
	struct ttm_base_object base;
	struct vmw_shader shader;
	};

	static void vmw_user_shader_free(struct vmw_resource *res);
	static struct vmw_resource *
	vmw_user_shader_base_to_res(struct ttm_base_object *base);

	static int vmw_gb_shader_create(struct vmw_resource *res);
	static int vmw_gb_shader_bind(struct vmw_resource *res,
	struct ttm_validate_buffer *val_buf);
	static int vmw_gb_shader_unbind(struct vmw_resource *res,
	bool readback,
	struct ttm_validate_buffer *val_buf);
	static int vmw_gb_shader_destroy(struct vmw_resource *res);

	static uint64_t vmw_user_shader_size;

	static const struct vmw_user_resource_conv user_shader_conv = {
	.object_type = VMW_RES_SHADER,
	.base_obj_to_res = vmw_user_shader_base_to_res,
	.res_free = vmw_user_shader_free
	};

	const struct vmw_user_resource_conv *user_shader_converter =
	&user_shader_conv;


	static const struct vmw_res_func vmw_gb_shader_func = {
	.res_type = vmw_res_shader,
	.needs_backup = true,
	.may_evict = true,
	.type_name = "guest backed shaders",
	.backup_placement = &vmw_mob_placement,
	.create = vmw_gb_shader_create,
	.destroy = vmw_gb_shader_destroy,
	.bind = vmw_gb_shader_bind,
	.unbind = vmw_gb_shader_unbind
	};

	/**
	* Shader management:
	*/

	static inline struct vmw_shader *
	vmw_res_to_shader(struct vmw_resource *res)
	{
	return container_of(res, struct vmw_shader, res);
	}

	static void vmw_hw_shader_destroy(struct vmw_resource *res)
	{
	(void) vmw_gb_shader_destroy(res);
	}

	static int vmw_gb_shader_init(struct vmw_private *dev_priv,
	struct vmw_resource *res,
	uint32_t size,
	uint64_t offset,
	SVGA3dShaderType type,
	struct vmw_dma_buffer *byte_code,
	void (res_free) (struct vmw_resource res))
	{
	struct vmw_shader *shader = vmw_res_to_shader(res);
	int ret;

	ret = vmw_resource_init(dev_priv, res, true,
	res_free, &vmw_gb_shader_func);


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

	res->backup_size = size;
	if (byte_code) {
	res->backup = vmw_dmabuf_reference(byte_code);
	res->backup_offset = offset;
	}
	shader->size = size;
	shader->type = type;

	vmw_resource_activate(res, vmw_hw_shader_destroy);
	return 0;
	}

	static int vmw_gb_shader_create(struct vmw_resource *res)
	{
	struct vmw_private *dev_priv = res->dev_priv;
	struct vmw_shader *shader = vmw_res_to_shader(res);
	int ret;
	struct {
	SVGA3dCmdHeader header;
	SVGA3dCmdDefineGBShader 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 shader id.\n");
	goto out_no_id;
	}

	if (unlikely(res->id >= VMWGFX_NUM_GB_SHADER)) {
	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 shader "
	"creation.\n");
	ret = -ENOMEM;
	goto out_no_fifo;
	}

	cmd->header.id = SVGA_3D_CMD_DEFINE_GB_SHADER;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.shid = res->id;
	cmd->body.type = shader->type;
	cmd->body.sizeInBytes = shader->size;
	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_shader_bind(struct vmw_resource *res,
	struct ttm_validate_buffer *val_buf)
	{
	struct vmw_private *dev_priv = res->dev_priv;
	struct {
	SVGA3dCmdHeader header;
	SVGA3dCmdBindGBShader 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 shader "
	"binding.\n");
	return -ENOMEM;
	}

	cmd->header.id = SVGA_3D_CMD_BIND_GB_SHADER;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.shid = res->id;
	cmd->body.mobid = bo->mem.start;
	cmd->body.offsetInBytes = 0;
	res->backup_dirty = false;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	return 0;
	}

	static int vmw_gb_shader_unbind(struct vmw_resource *res,
	bool readback,
	struct ttm_validate_buffer *val_buf)
	{
	struct vmw_private *dev_priv = res->dev_priv;
	struct {
	SVGA3dCmdHeader header;
	SVGA3dCmdBindGBShader body;
	} *cmd;
	struct vmw_fence_obj *fence;

	BUG_ON(res->backup->base.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 shader "
	"unbinding.\n");
	return -ENOMEM;
	}

	cmd->header.id = SVGA_3D_CMD_BIND_GB_SHADER;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.shid = res->id;
	cmd->body.mobid = SVGA3D_INVALID_ID;
	cmd->body.offsetInBytes = 0;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	/*
	* 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;
	}

	static int vmw_gb_shader_destroy(struct vmw_resource *res)
	{
	struct vmw_private *dev_priv = res->dev_priv;
	struct {
	SVGA3dCmdHeader header;
	SVGA3dCmdDestroyGBShader body;
	} *cmd;

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

	mutex_lock(&dev_priv->binding_mutex);
	vmw_context_binding_res_list_kill(&res->binding_head);

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

	cmd->header.id = SVGA_3D_CMD_DESTROY_GB_SHADER;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.shid = res->id;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));
	mutex_unlock(&dev_priv->binding_mutex);
	vmw_resource_release_id(res);
	vmw_3d_resource_dec(dev_priv, false);

	return 0;
	}

	/**
	* User-space shader management:
	*/

	static struct vmw_resource *
	vmw_user_shader_base_to_res(struct ttm_base_object *base)
	{
	return &(container_of(base, struct vmw_user_shader, base)->
	shader.res);
	}

	static void vmw_user_shader_free(struct vmw_resource *res)
	{
	struct vmw_user_shader *ushader =
	container_of(res, struct vmw_user_shader, shader.res);
	struct vmw_private *dev_priv = res->dev_priv;

	ttm_base_object_kfree(ushader, base);
	ttm_mem_global_free(vmw_mem_glob(dev_priv),
	vmw_user_shader_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_shader_base_release(struct ttm_base_object **p_base)
	{
	struct ttm_base_object base = p_base;
	struct vmw_resource *res = vmw_user_shader_base_to_res(base);

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

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

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

	int vmw_shader_define_ioctl(struct drm_device dev, void data,
	struct drm_file *file_priv)
	{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct vmw_user_shader *ushader;
	struct vmw_resource *res;
	struct vmw_resource *tmp;
	struct drm_vmw_shader_create_arg *arg =
	(struct drm_vmw_shader_create_arg *)data;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	struct vmw_master *vmaster = vmw_master(file_priv->master);
	struct vmw_dma_buffer *buffer = NULL;
	SVGA3dShaderType shader_type;
	int ret;

	if (arg->buffer_handle != SVGA3D_INVALID_ID) {
	ret = vmw_user_dmabuf_lookup(tfile, arg->buffer_handle,
	&buffer);
	if (unlikely(ret != 0)) {
	DRM_ERROR("Could not find buffer for shader "
	"creation.\n");
	return ret;
	}

	if ((u64)buffer->base.num_pages * PAGE_SIZE <
	(u64)arg->size + (u64)arg->offset) {
	DRM_ERROR("Illegal buffer- or shader size.\n");
	ret = -EINVAL;
	goto out_bad_arg;
	}
	}

	switch (arg->shader_type) {
	case drm_vmw_shader_type_vs:
	shader_type = SVGA3D_SHADERTYPE_VS;
	break;
	case drm_vmw_shader_type_ps:
	shader_type = SVGA3D_SHADERTYPE_PS;
	break;
	case drm_vmw_shader_type_gs:
	shader_type = SVGA3D_SHADERTYPE_GS;
	break;
	default:
	DRM_ERROR("Illegal shader type.\n");
	ret = -EINVAL;
	goto out_bad_arg;
	}

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

	if (unlikely(vmw_user_shader_size == 0))
	vmw_user_shader_size = ttm_round_pot(sizeof(*ushader))
	+ 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_shader_size,
	false, true);
	if (unlikely(ret != 0)) {
	if (ret != -ERESTARTSYS)
	DRM_ERROR("Out of graphics memory for shader"
	" creation.\n");
	goto out_unlock;
	}

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

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

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

	ret = vmw_gb_shader_init(dev_priv, res, arg->size,
	arg->offset, shader_type, buffer,
	vmw_user_shader_free);
	if (unlikely(ret != 0))
	goto out_unlock;

	tmp = vmw_resource_reference(res);
	ret = ttm_base_object_init(tfile, &ushader->base, false,
	VMW_RES_SHADER,
	&vmw_user_shader_base_release, NULL);

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

	arg->shader_handle = ushader->base.hash.key;
	out_err:
	vmw_resource_unreference(&res);
	out_unlock:
	ttm_read_unlock(&vmaster->lock);
	out_bad_arg:
	vmw_dmabuf_unreference(&buffer);

	return ret;

	}