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

 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
 /*
  * Copyright (c) 2021-2024 Broadcom. All Rights Reserved. The term
  * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
  *
  * Permission is hereby granted, free of charge, to any person
  * obtaining a copy of this software and associated documentation
  * files (the "Software"), to deal in the Software without
  * restriction, including without limitation the rights to use, copy,
  * modify, merge, publish, distribute, sublicense, and/or sell copies
  * of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be
  * included in all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  *
  */

 #include "vmwgfx_bo.h"
 #include "vmwgfx_drv.h"

 #include "drm/drm_prime.h"
 #include "drm/drm_gem_ttm_helper.h"

 #include <linux/debugfs.h>

 static void vmw_gem_object_free(struct drm_gem_object *gobj)
 {
 	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gobj);
 	if (bo)
 		ttm_bo_put(bo);
 }

 static int vmw_gem_object_open(struct drm_gem_object *obj,
 			       struct drm_file *file_priv)
 {
 	return 0;
 }

 static void vmw_gem_object_close(struct drm_gem_object *obj,
 				 struct drm_file *file_priv)
 {
 }

 static int vmw_gem_object_pin(struct drm_gem_object *obj)
 {
 	struct vmw_bo *vbo = to_vmw_bo(obj);

 	vmw_bo_pin_reserved(vbo, true);

 	return 0;
 }

 static void vmw_gem_object_unpin(struct drm_gem_object *obj)
 {
 	struct vmw_bo *vbo = to_vmw_bo(obj);

 	vmw_bo_pin_reserved(vbo, false);
 }

 static struct sg_table *vmw_gem_object_get_sg_table(struct drm_gem_object *obj)
 {
 	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
 	struct vmw_ttm_tt *vmw_tt =
 		container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm);

 	if (vmw_tt->vsgt.sgt)
 		return vmw_tt->vsgt.sgt;

 	return drm_prime_pages_to_sg(obj->dev, vmw_tt->dma_ttm.pages, vmw_tt->dma_ttm.num_pages);
 }

 static int vmw_gem_vmap(struct drm_gem_object *obj, struct iosys_map *map)
 {
 	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
 	int ret;

 	if (obj->import_attach) {
 		ret = dma_buf_vmap(obj->import_attach->dmabuf, map);
 		if (!ret) {
 			if (drm_WARN_ON(obj->dev, map->is_iomem)) {
 				dma_buf_vunmap(obj->import_attach->dmabuf, map);
 				return -EIO;
 			}
 		}
 	} else {
 		ret = ttm_bo_vmap(bo, map);
 	}

 	return ret;
 }

 static void vmw_gem_vunmap(struct drm_gem_object *obj, struct iosys_map *map)
 {
 	if (obj->import_attach)
 		dma_buf_vunmap(obj->import_attach->dmabuf, map);
 	else
 		drm_gem_ttm_vunmap(obj, map);
 }

 static int vmw_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 {
 	int ret;

 	if (obj->import_attach) {
 		/*
 		 * Reset both vm_ops and vm_private_data, so we don't end up with
 		 * vm_ops pointing to our implementation if the dma-buf backend
 		 * doesn't set those fields.
 		 */
 		vma->vm_private_data = NULL;
 		vma->vm_ops = NULL;

 		ret = dma_buf_mmap(obj->dma_buf, vma, 0);

 		/* Drop the reference drm_gem_mmap_obj() acquired.*/
 		if (!ret)
 			drm_gem_object_put(obj);

 		return ret;
 	}

 	return drm_gem_ttm_mmap(obj, vma);
 }

 static const struct vm_operations_struct vmw_vm_ops = {
 	.pfn_mkwrite = vmw_bo_vm_mkwrite,
 	.page_mkwrite = vmw_bo_vm_mkwrite,
 	.fault = vmw_bo_vm_fault,
 	.open = ttm_bo_vm_open,
 	.close = ttm_bo_vm_close,
 };

 static const struct drm_gem_object_funcs vmw_gem_object_funcs = {
 	.free = vmw_gem_object_free,
 	.open = vmw_gem_object_open,
 	.close = vmw_gem_object_close,
 	.print_info = drm_gem_ttm_print_info,
 	.pin = vmw_gem_object_pin,
 	.unpin = vmw_gem_object_unpin,
 	.get_sg_table = vmw_gem_object_get_sg_table,
 	.vmap = vmw_gem_vmap,
 	.vunmap = vmw_gem_vunmap,
 	.mmap = vmw_gem_mmap,
 	.vm_ops = &vmw_vm_ops,
 };

 int vmw_gem_object_create(struct vmw_private *vmw,
 			  struct vmw_bo_params *params,
 			  struct vmw_bo **p_vbo)
 {
 	int ret = vmw_bo_create(vmw, params, p_vbo);

 	if (ret != 0)
 		goto out_no_bo;

 	(*p_vbo)->tbo.base.funcs = &vmw_gem_object_funcs;
 out_no_bo:
 	return ret;
 }

 int vmw_gem_object_create_with_handle(struct vmw_private *dev_priv,
 				      struct drm_file *filp,
 				      uint32_t size,
 				      uint32_t *handle,
 				      struct vmw_bo **p_vbo)
 {
 	int ret;
 	struct vmw_bo_params params = {
 		.domain = (dev_priv->has_mob) ? VMW_BO_DOMAIN_SYS : VMW_BO_DOMAIN_VRAM,
 		.busy_domain = VMW_BO_DOMAIN_SYS,
 		.bo_type = ttm_bo_type_device,
 		.size = size,
 		.pin = false
 	};

 	ret = vmw_gem_object_create(dev_priv, &params, p_vbo);
 	if (ret != 0)
 		goto out_no_bo;

 	ret = drm_gem_handle_create(filp, &(*p_vbo)->tbo.base, handle);
 out_no_bo:
 	return ret;
 }

 struct drm_gem_object *vmw_prime_import_sg_table(struct drm_device *dev,
 						 struct dma_buf_attachment *attach,
 						 struct sg_table *table)
 {
 	int ret;
 	struct vmw_private *dev_priv = vmw_priv(dev);
 	struct drm_gem_object *gem = NULL;
 	struct vmw_bo *vbo;
 	struct vmw_bo_params params = {
 		.domain = (dev_priv->has_mob) ? VMW_BO_DOMAIN_SYS : VMW_BO_DOMAIN_VRAM,
 		.busy_domain = VMW_BO_DOMAIN_SYS,
 		.bo_type = ttm_bo_type_sg,
 		.size = attach->dmabuf->size,
 		.pin = false,
 		.resv = attach->dmabuf->resv,
 		.sg = table,

 	};

 	dma_resv_lock(params.resv, NULL);

 	ret = vmw_bo_create(dev_priv, &params, &vbo);
 	if (ret != 0)
 		goto out_no_bo;

 	vbo->tbo.base.funcs = &vmw_gem_object_funcs;

 	gem = &vbo->tbo.base;
 out_no_bo:
 	dma_resv_unlock(params.resv);
 	return gem;
 }

 int vmw_gem_object_create_ioctl(struct drm_device *dev, void *data,
 				struct drm_file *filp)
 {
 	struct vmw_private *dev_priv = vmw_priv(dev);
 	union drm_vmw_alloc_dmabuf_arg *arg =
 	    (union drm_vmw_alloc_dmabuf_arg *)data;
 	struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
 	struct drm_vmw_dmabuf_rep *rep = &arg->rep;
 	struct vmw_bo *vbo;
 	uint32_t handle;
 	int ret;

 	ret = vmw_gem_object_create_with_handle(dev_priv, filp,
 						req->size, &handle, &vbo);
 	if (ret)
 		goto out_no_bo;

 	rep->handle = handle;
 	rep->map_handle = drm_vma_node_offset_addr(&vbo->tbo.base.vma_node);
 	rep->cur_gmr_id = handle;
 	rep->cur_gmr_offset = 0;
 	/* drop reference from allocate - handle holds it now */
 	drm_gem_object_put(&vbo->tbo.base);
 out_no_bo:
 	return ret;
 }

 #if defined(CONFIG_DEBUG_FS)

 static void vmw_bo_print_info(int id, struct vmw_bo *bo, struct seq_file *m)
 {
 	const char *placement;
 	const char *type;

 	switch (bo->tbo.resource->mem_type) {
 	case TTM_PL_SYSTEM:
 		placement = " CPU";
 		break;
 	case VMW_PL_GMR:
 		placement = " GMR";
 		break;
 	case VMW_PL_MOB:
 		placement = " MOB";
 		break;
 	case VMW_PL_SYSTEM:
 		placement = "VCPU";
 		break;
 	case TTM_PL_VRAM:
 		placement = "VRAM";
 		break;
 	default:
 		placement = "None";
 		break;
 	}

 	switch (bo->tbo.type) {
 	case ttm_bo_type_device:
 		type = "device";
 		break;
 	case ttm_bo_type_kernel:
 		type = "kernel";
 		break;
 	case ttm_bo_type_sg:
 		type = "sg    ";
 		break;
 	default:
 		type = "none  ";
 		break;
 	}

 	seq_printf(m, "\t\t0x%08x: %12zu bytes %s, type = %s",
 		   id, bo->tbo.base.size, placement, type);
 	seq_printf(m, ", priority = %u, pin_count = %u, GEM refs = %d, TTM refs = %d",
 		   bo->tbo.priority,
 		   bo->tbo.pin_count,
 		   kref_read(&bo->tbo.base.refcount),
 		   kref_read(&bo->tbo.kref));
 	seq_puts(m, "\n");
 }

 static int vmw_debugfs_gem_info_show(struct seq_file *m, void *unused)
 {
 	struct vmw_private *vdev = (struct vmw_private *)m->private;
 	struct drm_device *dev = &vdev->drm;
 	struct drm_file *file;
 	int r;

 	r = mutex_lock_interruptible(&dev->filelist_mutex);
 	if (r)
 		return r;

 	list_for_each_entry(file, &dev->filelist, lhead) {
 		struct task_struct *task;
 		struct drm_gem_object *gobj;
 		struct pid *pid;
 		int id;

 		/*
 		 * Although we have a valid reference on file->pid, that does
 		 * not guarantee that the task_struct who called get_pid() is
 		 * still alive (e.g. get_pid(current) => fork() => exit()).
 		 * Therefore, we need to protect this ->comm access using RCU.
 		 */
 		rcu_read_lock();
 		pid = rcu_dereference(file->pid);
 		task = pid_task(pid, PIDTYPE_TGID);
 		seq_printf(m, "pid %8d command %s:\n", pid_nr(pid),
 			   task ? task->comm : "<unknown>");
 		rcu_read_unlock();

 		spin_lock(&file->table_lock);
 		idr_for_each_entry(&file->object_idr, gobj, id) {
 			struct vmw_bo *bo = to_vmw_bo(gobj);

 			vmw_bo_print_info(id, bo, m);
 		}
 		spin_unlock(&file->table_lock);
 	}

 	mutex_unlock(&dev->filelist_mutex);
 	return 0;
 }

 DEFINE_SHOW_ATTRIBUTE(vmw_debugfs_gem_info);

 #endif

 void vmw_debugfs_gem_init(struct vmw_private *vdev)
 {
 #if defined(CONFIG_DEBUG_FS)
 	struct drm_minor *minor = vdev->drm.primary;
 	struct dentry *root = minor->debugfs_root;

 	debugfs_create_file("vmwgfx_gem_info", 0444, root, vdev,
 			    &vmw_debugfs_gem_info_fops);
 #endif
 }
	/* SPDX-License-Identifier: GPL-2.0 OR MIT */
	/*
	* Copyright (c) 2021-2024 Broadcom. All Rights Reserved. The term
	* “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
	*
	* Permission is hereby granted, free of charge, to any person
	* obtaining a copy of this software and associated documentation
	* files (the "Software"), to deal in the Software without
	* restriction, including without limitation the rights to use, copy,
	* modify, merge, publish, distribute, sublicense, and/or sell copies
	* of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be
	* included in all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	* SOFTWARE.
	*
	*/

	#include "vmwgfx_bo.h"
	#include "vmwgfx_drv.h"

	#include "drm/drm_prime.h"
	#include "drm/drm_gem_ttm_helper.h"

	#include <linux/debugfs.h>

	static void vmw_gem_object_free(struct drm_gem_object *gobj)
	{
	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gobj);
	if (bo)
	ttm_bo_put(bo);
	}

	static int vmw_gem_object_open(struct drm_gem_object *obj,
	struct drm_file *file_priv)
	{
	return 0;
	}

	static void vmw_gem_object_close(struct drm_gem_object *obj,
	struct drm_file *file_priv)
	{
	}

	static int vmw_gem_object_pin(struct drm_gem_object *obj)
	{
	struct vmw_bo *vbo = to_vmw_bo(obj);

	vmw_bo_pin_reserved(vbo, true);

	return 0;
	}

	static void vmw_gem_object_unpin(struct drm_gem_object *obj)
	{
	struct vmw_bo *vbo = to_vmw_bo(obj);

	vmw_bo_pin_reserved(vbo, false);
	}

	static struct sg_table vmw_gem_object_get_sg_table(struct drm_gem_object obj)
	{
	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
	struct vmw_ttm_tt *vmw_tt =
	container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm);

	if (vmw_tt->vsgt.sgt)
	return vmw_tt->vsgt.sgt;

	return drm_prime_pages_to_sg(obj->dev, vmw_tt->dma_ttm.pages, vmw_tt->dma_ttm.num_pages);
	}

	static int vmw_gem_vmap(struct drm_gem_object obj, struct iosys_map map)
	{
	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
	int ret;

	if (obj->import_attach) {
	ret = dma_buf_vmap(obj->import_attach->dmabuf, map);
	if (!ret) {
	if (drm_WARN_ON(obj->dev, map->is_iomem)) {
	dma_buf_vunmap(obj->import_attach->dmabuf, map);
	return -EIO;
	}
	}
	} else {
	ret = ttm_bo_vmap(bo, map);
	}

	return ret;
	}

	static void vmw_gem_vunmap(struct drm_gem_object obj, struct iosys_map map)
	{
	if (obj->import_attach)
	dma_buf_vunmap(obj->import_attach->dmabuf, map);
	else
	drm_gem_ttm_vunmap(obj, map);
	}

	static int vmw_gem_mmap(struct drm_gem_object obj, struct vm_area_struct vma)
	{
	int ret;

	if (obj->import_attach) {
	/*
	* Reset both vm_ops and vm_private_data, so we don't end up with
	* vm_ops pointing to our implementation if the dma-buf backend
	* doesn't set those fields.
	*/
	vma->vm_private_data = NULL;
	vma->vm_ops = NULL;

	ret = dma_buf_mmap(obj->dma_buf, vma, 0);

	/* Drop the reference drm_gem_mmap_obj() acquired.*/
	if (!ret)
	drm_gem_object_put(obj);

	return ret;
	}

	return drm_gem_ttm_mmap(obj, vma);
	}

	static const struct vm_operations_struct vmw_vm_ops = {
	.pfn_mkwrite = vmw_bo_vm_mkwrite,
	.page_mkwrite = vmw_bo_vm_mkwrite,
	.fault = vmw_bo_vm_fault,
	.open = ttm_bo_vm_open,
	.close = ttm_bo_vm_close,
	};

	static const struct drm_gem_object_funcs vmw_gem_object_funcs = {
	.free = vmw_gem_object_free,
	.open = vmw_gem_object_open,
	.close = vmw_gem_object_close,
	.print_info = drm_gem_ttm_print_info,
	.pin = vmw_gem_object_pin,
	.unpin = vmw_gem_object_unpin,
	.get_sg_table = vmw_gem_object_get_sg_table,
	.vmap = vmw_gem_vmap,
	.vunmap = vmw_gem_vunmap,
	.mmap = vmw_gem_mmap,
	.vm_ops = &vmw_vm_ops,
	};

	int vmw_gem_object_create(struct vmw_private *vmw,
	struct vmw_bo_params *params,
	struct vmw_bo **p_vbo)
	{
	int ret = vmw_bo_create(vmw, params, p_vbo);

	if (ret != 0)
	goto out_no_bo;

	(*p_vbo)->tbo.base.funcs = &vmw_gem_object_funcs;
	out_no_bo:
	return ret;
	}

	int vmw_gem_object_create_with_handle(struct vmw_private *dev_priv,
	struct drm_file *filp,
	uint32_t size,
	uint32_t *handle,
	struct vmw_bo **p_vbo)
	{
	int ret;
	struct vmw_bo_params params = {
	.domain = (dev_priv->has_mob) ? VMW_BO_DOMAIN_SYS : VMW_BO_DOMAIN_VRAM,
	.busy_domain = VMW_BO_DOMAIN_SYS,
	.bo_type = ttm_bo_type_device,
	.size = size,
	.pin = false
	};

	ret = vmw_gem_object_create(dev_priv, &params, p_vbo);
	if (ret != 0)
	goto out_no_bo;

	ret = drm_gem_handle_create(filp, &(*p_vbo)->tbo.base, handle);
	out_no_bo:
	return ret;
	}

	struct drm_gem_object vmw_prime_import_sg_table(struct drm_device dev,
	struct dma_buf_attachment *attach,
	struct sg_table *table)
	{
	int ret;
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct drm_gem_object *gem = NULL;
	struct vmw_bo *vbo;
	struct vmw_bo_params params = {
	.domain = (dev_priv->has_mob) ? VMW_BO_DOMAIN_SYS : VMW_BO_DOMAIN_VRAM,
	.busy_domain = VMW_BO_DOMAIN_SYS,
	.bo_type = ttm_bo_type_sg,
	.size = attach->dmabuf->size,
	.pin = false,
	.resv = attach->dmabuf->resv,
	.sg = table,

	};

	dma_resv_lock(params.resv, NULL);

	ret = vmw_bo_create(dev_priv, &params, &vbo);
	if (ret != 0)
	goto out_no_bo;

	vbo->tbo.base.funcs = &vmw_gem_object_funcs;

	gem = &vbo->tbo.base;
	out_no_bo:
	dma_resv_unlock(params.resv);
	return gem;
	}

	int vmw_gem_object_create_ioctl(struct drm_device dev, void data,
	struct drm_file *filp)
	{
	struct vmw_private *dev_priv = vmw_priv(dev);
	union drm_vmw_alloc_dmabuf_arg *arg =
	(union drm_vmw_alloc_dmabuf_arg *)data;
	struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
	struct drm_vmw_dmabuf_rep *rep = &arg->rep;
	struct vmw_bo *vbo;
	uint32_t handle;
	int ret;

	ret = vmw_gem_object_create_with_handle(dev_priv, filp,
	req->size, &handle, &vbo);
	if (ret)
	goto out_no_bo;

	rep->handle = handle;
	rep->map_handle = drm_vma_node_offset_addr(&vbo->tbo.base.vma_node);
	rep->cur_gmr_id = handle;
	rep->cur_gmr_offset = 0;
	/* drop reference from allocate - handle holds it now */
	drm_gem_object_put(&vbo->tbo.base);
	out_no_bo:
	return ret;
	}

	#if defined(CONFIG_DEBUG_FS)

	static void vmw_bo_print_info(int id, struct vmw_bo bo, struct seq_file m)
	{
	const char *placement;
	const char *type;

	switch (bo->tbo.resource->mem_type) {
	case TTM_PL_SYSTEM:
	placement = " CPU";
	break;
	case VMW_PL_GMR:
	placement = " GMR";
	break;
	case VMW_PL_MOB:
	placement = " MOB";
	break;
	case VMW_PL_SYSTEM:
	placement = "VCPU";
	break;
	case TTM_PL_VRAM:
	placement = "VRAM";
	break;
	default:
	placement = "None";
	break;
	}

	switch (bo->tbo.type) {
	case ttm_bo_type_device:
	type = "device";
	break;
	case ttm_bo_type_kernel:
	type = "kernel";
	break;
	case ttm_bo_type_sg:
	type = "sg ";
	break;
	default:
	type = "none ";
	break;
	}

	seq_printf(m, "\t\t0x%08x: %12zu bytes %s, type = %s",
	id, bo->tbo.base.size, placement, type);
	seq_printf(m, ", priority = %u, pin_count = %u, GEM refs = %d, TTM refs = %d",
	bo->tbo.priority,
	bo->tbo.pin_count,
	kref_read(&bo->tbo.base.refcount),
	kref_read(&bo->tbo.kref));
	seq_puts(m, "\n");
	}

	static int vmw_debugfs_gem_info_show(struct seq_file m, void unused)
	{
	struct vmw_private vdev = (struct vmw_private )m->private;
	struct drm_device *dev = &vdev->drm;
	struct drm_file *file;
	int r;

	r = mutex_lock_interruptible(&dev->filelist_mutex);
	if (r)
	return r;

	list_for_each_entry(file, &dev->filelist, lhead) {
	struct task_struct *task;
	struct drm_gem_object *gobj;
	struct pid *pid;
	int id;

	/*
	* Although we have a valid reference on file->pid, that does
	* not guarantee that the task_struct who called get_pid() is
	* still alive (e.g. get_pid(current) => fork() => exit()).
	* Therefore, we need to protect this ->comm access using RCU.
	*/
	rcu_read_lock();
	pid = rcu_dereference(file->pid);
	task = pid_task(pid, PIDTYPE_TGID);
	seq_printf(m, "pid %8d command %s:\n", pid_nr(pid),
	task ? task->comm : "<unknown>");
	rcu_read_unlock();

	spin_lock(&file->table_lock);
	idr_for_each_entry(&file->object_idr, gobj, id) {
	struct vmw_bo *bo = to_vmw_bo(gobj);

	vmw_bo_print_info(id, bo, m);
	}
	spin_unlock(&file->table_lock);
	}

	mutex_unlock(&dev->filelist_mutex);
	return 0;
	}

	DEFINE_SHOW_ATTRIBUTE(vmw_debugfs_gem_info);

	#endif

	void vmw_debugfs_gem_init(struct vmw_private *vdev)
	{
	#if defined(CONFIG_DEBUG_FS)
	struct drm_minor *minor = vdev->drm.primary;
	struct dentry *root = minor->debugfs_root;

	debugfs_create_file("vmwgfx_gem_info", 0444, root, vdev,
	&vmw_debugfs_gem_info_fops);
	#endif
	}