drivers/gpu/drm/i915/gvt/gvt.c - linux - Git at Google

 /*
  * Copyright(c) 2011-2016 Intel Corporation. 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, 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 (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 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.
  *
  * Authors:
  *    Kevin Tian <kevin.tian@intel.com>
  *    Eddie Dong <eddie.dong@intel.com>
  *
  * Contributors:
  *    Niu Bing <bing.niu@intel.com>
  *    Zhi Wang <zhi.a.wang@intel.com>
  *
  */

 #include <linux/types.h>
 #include <xen/xen.h>
 #include <linux/kthread.h>

 #include "i915_drv.h"
 #include "gvt.h"
 #include <linux/vfio.h>
 #include <linux/mdev.h>

 struct intel_gvt_host intel_gvt_host;

 static const char * const supported_hypervisors[] = {
 	[INTEL_GVT_HYPERVISOR_XEN] = "XEN",
 	[INTEL_GVT_HYPERVISOR_KVM] = "KVM",
 };

 static struct intel_vgpu_type *intel_gvt_find_vgpu_type(struct intel_gvt *gvt,
 		const char *name)
 {
 	int i;
 	struct intel_vgpu_type *t;
 	const char *driver_name = dev_driver_string(
 			&gvt->dev_priv->drm.pdev->dev);

 	for (i = 0; i < gvt->num_types; i++) {
 		t = &gvt->types[i];
 		if (!strncmp(t->name, name + strlen(driver_name) + 1,
 			sizeof(t->name)))
 			return t;
 	}

 	return NULL;
 }

 static ssize_t available_instances_show(struct kobject *kobj,
 					struct device *dev, char *buf)
 {
 	struct intel_vgpu_type *type;
 	unsigned int num = 0;
 	void *gvt = kdev_to_i915(dev)->gvt;

 	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
 	if (!type)
 		num = 0;
 	else
 		num = type->avail_instance;

 	return sprintf(buf, "%u\n", num);
 }

 static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
 		char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }

 static ssize_t description_show(struct kobject *kobj, struct device *dev,
 		char *buf)
 {
 	struct intel_vgpu_type *type;
 	void *gvt = kdev_to_i915(dev)->gvt;

 	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
 	if (!type)
 		return 0;

 	return sprintf(buf, "low_gm_size: %dMB\nhigh_gm_size: %dMB\n"
 		       "fence: %d\nresolution: %s\n"
 		       "weight: %d\n",
 		       BYTES_TO_MB(type->low_gm_size),
 		       BYTES_TO_MB(type->high_gm_size),
 		       type->fence, vgpu_edid_str(type->resolution),
 		       type->weight);
 }

 static MDEV_TYPE_ATTR_RO(available_instances);
 static MDEV_TYPE_ATTR_RO(device_api);
 static MDEV_TYPE_ATTR_RO(description);

 static struct attribute *gvt_type_attrs[] = {
 	&mdev_type_attr_available_instances.attr,
 	&mdev_type_attr_device_api.attr,
 	&mdev_type_attr_description.attr,
 	NULL,
 };

 static struct attribute_group *gvt_vgpu_type_groups[] = {
 	[0 ... NR_MAX_INTEL_VGPU_TYPES - 1] = NULL,
 };

 static bool intel_get_gvt_attrs(struct attribute ***type_attrs,
 		struct attribute_group ***intel_vgpu_type_groups)
 {
 	*type_attrs = gvt_type_attrs;
 	*intel_vgpu_type_groups = gvt_vgpu_type_groups;
 	return true;
 }

 static bool intel_gvt_init_vgpu_type_groups(struct intel_gvt *gvt)
 {
 	int i, j;
 	struct intel_vgpu_type *type;
 	struct attribute_group *group;

 	for (i = 0; i < gvt->num_types; i++) {
 		type = &gvt->types[i];

 		group = kzalloc(sizeof(struct attribute_group), GFP_KERNEL);
 		if (WARN_ON(!group))
 			goto unwind;

 		group->name = type->name;
 		group->attrs = gvt_type_attrs;
 		gvt_vgpu_type_groups[i] = group;
 	}

 	return true;

 unwind:
 	for (j = 0; j < i; j++) {
 		group = gvt_vgpu_type_groups[j];
 		kfree(group);
 	}

 	return false;
 }

 static void intel_gvt_cleanup_vgpu_type_groups(struct intel_gvt *gvt)
 {
 	int i;
 	struct attribute_group *group;

 	for (i = 0; i < gvt->num_types; i++) {
 		group = gvt_vgpu_type_groups[i];
 		gvt_vgpu_type_groups[i] = NULL;
 		kfree(group);
 	}
 }

 static const struct intel_gvt_ops intel_gvt_ops = {
 	.emulate_cfg_read = intel_vgpu_emulate_cfg_read,
 	.emulate_cfg_write = intel_vgpu_emulate_cfg_write,
 	.emulate_mmio_read = intel_vgpu_emulate_mmio_read,
 	.emulate_mmio_write = intel_vgpu_emulate_mmio_write,
 	.vgpu_create = intel_gvt_create_vgpu,
 	.vgpu_destroy = intel_gvt_destroy_vgpu,
 	.vgpu_release = intel_gvt_release_vgpu,
 	.vgpu_reset = intel_gvt_reset_vgpu,
 	.vgpu_activate = intel_gvt_activate_vgpu,
 	.vgpu_deactivate = intel_gvt_deactivate_vgpu,
 	.gvt_find_vgpu_type = intel_gvt_find_vgpu_type,
 	.get_gvt_attrs = intel_get_gvt_attrs,
 	.vgpu_query_plane = intel_vgpu_query_plane,
 	.vgpu_get_dmabuf = intel_vgpu_get_dmabuf,
 	.write_protect_handler = intel_vgpu_page_track_handler,
 };

 /**
  * intel_gvt_init_host - Load MPT modules and detect if we're running in host
  * @gvt: intel gvt device
  *
  * This function is called at the driver loading stage. If failed to find a
  * loadable MPT module or detect currently we're running in a VM, then GVT-g
  * will be disabled
  *
  * Returns:
  * Zero on success, negative error code if failed.
  *
  */
 int intel_gvt_init_host(void)
 {
 	if (intel_gvt_host.initialized)
 		return 0;

 	/* Xen DOM U */
 	if (xen_domain() && !xen_initial_domain())
 		return -ENODEV;

 	/* Try to load MPT modules for hypervisors */
 	if (xen_initial_domain()) {
 		/* In Xen dom0 */
 		intel_gvt_host.mpt = try_then_request_module(
 				symbol_get(xengt_mpt), "xengt");
 		intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_XEN;
 	} else {
 #if IS_ENABLED(CONFIG_DRM_I915_GVT_KVMGT)
 		/* not in Xen. Try KVMGT */
 		intel_gvt_host.mpt = try_then_request_module(
 				symbol_get(kvmgt_mpt), "kvmgt");
 		intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_KVM;
 #endif
 	}

 	/* Fail to load MPT modules - bail out */
 	if (!intel_gvt_host.mpt)
 		return -EINVAL;

 	gvt_dbg_core("Running with hypervisor %s in host mode\n",
 			supported_hypervisors[intel_gvt_host.hypervisor_type]);

 	intel_gvt_host.initialized = true;
 	return 0;
 }

 static void init_device_info(struct intel_gvt *gvt)
 {
 	struct intel_gvt_device_info *info = &gvt->device_info;
 	struct pci_dev *pdev = gvt->dev_priv->drm.pdev;

 	info->max_support_vgpus = 8;
 	info->cfg_space_size = PCI_CFG_SPACE_EXP_SIZE;
 	info->mmio_size = 2 * 1024 * 1024;
 	info->mmio_bar = 0;
 	info->gtt_start_offset = 8 * 1024 * 1024;
 	info->gtt_entry_size = 8;
 	info->gtt_entry_size_shift = 3;
 	info->gmadr_bytes_in_cmd = 8;
 	info->max_surface_size = 36 * 1024 * 1024;
 	info->msi_cap_offset = pdev->msi_cap;
 }

 static int gvt_service_thread(void *data)
 {
 	struct intel_gvt *gvt = (struct intel_gvt *)data;
 	int ret;

 	gvt_dbg_core("service thread start\n");

 	while (!kthread_should_stop()) {
 		ret = wait_event_interruptible(gvt->service_thread_wq,
 				kthread_should_stop() || gvt->service_request);

 		if (kthread_should_stop())
 			break;

 		if (WARN_ONCE(ret, "service thread is waken up by signal.\n"))
 			continue;

 		if (test_and_clear_bit(INTEL_GVT_REQUEST_EMULATE_VBLANK,
 					(void *)&gvt->service_request))
 			intel_gvt_emulate_vblank(gvt);

 		if (test_bit(INTEL_GVT_REQUEST_SCHED,
 				(void *)&gvt->service_request) ||
 			test_bit(INTEL_GVT_REQUEST_EVENT_SCHED,
 					(void *)&gvt->service_request)) {
 			intel_gvt_schedule(gvt);
 		}
 	}

 	return 0;
 }

 static void clean_service_thread(struct intel_gvt *gvt)
 {
 	kthread_stop(gvt->service_thread);
 }

 static int init_service_thread(struct intel_gvt *gvt)
 {
 	init_waitqueue_head(&gvt->service_thread_wq);

 	gvt->service_thread = kthread_run(gvt_service_thread,
 			gvt, "gvt_service_thread");
 	if (IS_ERR(gvt->service_thread)) {
 		gvt_err("fail to start service thread.\n");
 		return PTR_ERR(gvt->service_thread);
 	}
 	return 0;
 }

 /**
  * intel_gvt_clean_device - clean a GVT device
  * @gvt: intel gvt device
  *
  * This function is called at the driver unloading stage, to free the
  * resources owned by a GVT device.
  *
  */
 void intel_gvt_clean_device(struct drm_i915_private *dev_priv)
 {
 	struct intel_gvt *gvt = to_gvt(dev_priv);

 	if (WARN_ON(!gvt))
 		return;

 	intel_gvt_destroy_idle_vgpu(gvt->idle_vgpu);
 	intel_gvt_hypervisor_host_exit(&dev_priv->drm.pdev->dev, gvt);
 	intel_gvt_cleanup_vgpu_type_groups(gvt);
 	intel_gvt_clean_vgpu_types(gvt);

 	intel_gvt_debugfs_clean(gvt);
 	clean_service_thread(gvt);
 	intel_gvt_clean_cmd_parser(gvt);
 	intel_gvt_clean_sched_policy(gvt);
 	intel_gvt_clean_workload_scheduler(gvt);
 	intel_gvt_clean_gtt(gvt);
 	intel_gvt_clean_irq(gvt);
 	intel_gvt_free_firmware(gvt);
 	intel_gvt_clean_mmio_info(gvt);
 	idr_destroy(&gvt->vgpu_idr);

 	kfree(dev_priv->gvt);
 	dev_priv->gvt = NULL;
 }

 /**
  * intel_gvt_init_device - initialize a GVT device
  * @dev_priv: drm i915 private data
  *
  * This function is called at the initialization stage, to initialize
  * necessary GVT components.
  *
  * Returns:
  * Zero on success, negative error code if failed.
  *
  */
 int intel_gvt_init_device(struct drm_i915_private *dev_priv)
 {
 	struct intel_gvt *gvt;
 	struct intel_vgpu *vgpu;
 	int ret;

 	/*
 	 * Cannot initialize GVT device without intel_gvt_host gets
 	 * initialized first.
 	 */
 	if (WARN_ON(!intel_gvt_host.initialized))
 		return -EINVAL;

 	if (WARN_ON(dev_priv->gvt))
 		return -EEXIST;

 	gvt = kzalloc(sizeof(struct intel_gvt), GFP_KERNEL);
 	if (!gvt)
 		return -ENOMEM;

 	gvt_dbg_core("init gvt device\n");

 	idr_init(&gvt->vgpu_idr);
 	spin_lock_init(&gvt->scheduler.mmio_context_lock);
 	mutex_init(&gvt->lock);
 	mutex_init(&gvt->sched_lock);
 	gvt->dev_priv = dev_priv;

 	init_device_info(gvt);

 	ret = intel_gvt_setup_mmio_info(gvt);
 	if (ret)
 		goto out_clean_idr;

 	intel_gvt_init_engine_mmio_context(gvt);

 	ret = intel_gvt_load_firmware(gvt);
 	if (ret)
 		goto out_clean_mmio_info;

 	ret = intel_gvt_init_irq(gvt);
 	if (ret)
 		goto out_free_firmware;

 	ret = intel_gvt_init_gtt(gvt);
 	if (ret)
 		goto out_clean_irq;

 	ret = intel_gvt_init_workload_scheduler(gvt);
 	if (ret)
 		goto out_clean_gtt;

 	ret = intel_gvt_init_sched_policy(gvt);
 	if (ret)
 		goto out_clean_workload_scheduler;

 	ret = intel_gvt_init_cmd_parser(gvt);
 	if (ret)
 		goto out_clean_sched_policy;

 	ret = init_service_thread(gvt);
 	if (ret)
 		goto out_clean_cmd_parser;

 	ret = intel_gvt_init_vgpu_types(gvt);
 	if (ret)
 		goto out_clean_thread;

 	ret = intel_gvt_init_vgpu_type_groups(gvt);
 	if (ret == false) {
 		gvt_err("failed to init vgpu type groups: %d\n", ret);
 		goto out_clean_types;
 	}

 	ret = intel_gvt_hypervisor_host_init(&dev_priv->drm.pdev->dev, gvt,
 				&intel_gvt_ops);
 	if (ret) {
 		gvt_err("failed to register gvt-g host device: %d\n", ret);
 		goto out_clean_types;
 	}

 	vgpu = intel_gvt_create_idle_vgpu(gvt);
 	if (IS_ERR(vgpu)) {
 		ret = PTR_ERR(vgpu);
 		gvt_err("failed to create idle vgpu\n");
 		goto out_clean_types;
 	}
 	gvt->idle_vgpu = vgpu;

 	ret = intel_gvt_debugfs_init(gvt);
 	if (ret)
 		gvt_err("debugfs registeration failed, go on.\n");

 	gvt_dbg_core("gvt device initialization is done\n");
 	dev_priv->gvt = gvt;
 	return 0;

 out_clean_types:
 	intel_gvt_clean_vgpu_types(gvt);
 out_clean_thread:
 	clean_service_thread(gvt);
 out_clean_cmd_parser:
 	intel_gvt_clean_cmd_parser(gvt);
 out_clean_sched_policy:
 	intel_gvt_clean_sched_policy(gvt);
 out_clean_workload_scheduler:
 	intel_gvt_clean_workload_scheduler(gvt);
 out_clean_gtt:
 	intel_gvt_clean_gtt(gvt);
 out_clean_irq:
 	intel_gvt_clean_irq(gvt);
 out_free_firmware:
 	intel_gvt_free_firmware(gvt);
 out_clean_mmio_info:
 	intel_gvt_clean_mmio_info(gvt);
 out_clean_idr:
 	idr_destroy(&gvt->vgpu_idr);
 	kfree(gvt);
 	return ret;
 }

 #if IS_ENABLED(CONFIG_DRM_I915_GVT_KVMGT)
 MODULE_SOFTDEP("pre: kvmgt");
 #endif
	/*
	* Copyright(c) 2011-2016 Intel Corporation. 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, 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 (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 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.
	*
	* Authors:
	* Kevin Tian <kevin.tian@intel.com>
	* Eddie Dong <eddie.dong@intel.com>
	*
	* Contributors:
	* Niu Bing <bing.niu@intel.com>
	* Zhi Wang <zhi.a.wang@intel.com>
	*
	*/

	#include <linux/types.h>
	#include <xen/xen.h>
	#include <linux/kthread.h>

	#include "i915_drv.h"
	#include "gvt.h"
	#include <linux/vfio.h>
	#include <linux/mdev.h>

	struct intel_gvt_host intel_gvt_host;

	static const char * const supported_hypervisors[] = {
	[INTEL_GVT_HYPERVISOR_XEN] = "XEN",
	[INTEL_GVT_HYPERVISOR_KVM] = "KVM",
	};

	static struct intel_vgpu_type intel_gvt_find_vgpu_type(struct intel_gvt gvt,
	const char *name)
	{
	int i;
	struct intel_vgpu_type *t;
	const char *driver_name = dev_driver_string(
	&gvt->dev_priv->drm.pdev->dev);

	for (i = 0; i < gvt->num_types; i++) {
	t = &gvt->types[i];
	if (!strncmp(t->name, name + strlen(driver_name) + 1,
	sizeof(t->name)))
	return t;
	}

	return NULL;
	}

	static ssize_t available_instances_show(struct kobject *kobj,
	struct device dev, char buf)
	{
	struct intel_vgpu_type *type;
	unsigned int num = 0;
	void *gvt = kdev_to_i915(dev)->gvt;

	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
	if (!type)
	num = 0;
	else
	num = type->avail_instance;

	return sprintf(buf, "%u\n", num);
	}

	static ssize_t device_api_show(struct kobject kobj, struct device dev,
	char *buf)
	{
	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
	}

	static ssize_t description_show(struct kobject kobj, struct device dev,
	char *buf)
	{
	struct intel_vgpu_type *type;
	void *gvt = kdev_to_i915(dev)->gvt;

	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
	if (!type)
	return 0;

	return sprintf(buf, "low_gm_size: %dMB\nhigh_gm_size: %dMB\n"
	"fence: %d\nresolution: %s\n"
	"weight: %d\n",
	BYTES_TO_MB(type->low_gm_size),
	BYTES_TO_MB(type->high_gm_size),
	type->fence, vgpu_edid_str(type->resolution),
	type->weight);
	}

	static MDEV_TYPE_ATTR_RO(available_instances);
	static MDEV_TYPE_ATTR_RO(device_api);
	static MDEV_TYPE_ATTR_RO(description);

	static struct attribute *gvt_type_attrs[] = {
	&mdev_type_attr_available_instances.attr,
	&mdev_type_attr_device_api.attr,
	&mdev_type_attr_description.attr,
	NULL,
	};

	static struct attribute_group *gvt_vgpu_type_groups[] = {
	[0 ... NR_MAX_INTEL_VGPU_TYPES - 1] = NULL,
	};

	static bool intel_get_gvt_attrs(struct attribute ***type_attrs,
	struct attribute_group ***intel_vgpu_type_groups)
	{
	*type_attrs = gvt_type_attrs;
	*intel_vgpu_type_groups = gvt_vgpu_type_groups;
	return true;
	}

	static bool intel_gvt_init_vgpu_type_groups(struct intel_gvt *gvt)
	{
	int i, j;
	struct intel_vgpu_type *type;
	struct attribute_group *group;

	for (i = 0; i < gvt->num_types; i++) {
	type = &gvt->types[i];

	group = kzalloc(sizeof(struct attribute_group), GFP_KERNEL);
	if (WARN_ON(!group))
	goto unwind;

	group->name = type->name;
	group->attrs = gvt_type_attrs;
	gvt_vgpu_type_groups[i] = group;
	}

	return true;

	unwind:
	for (j = 0; j < i; j++) {
	group = gvt_vgpu_type_groups[j];
	kfree(group);
	}

	return false;
	}

	static void intel_gvt_cleanup_vgpu_type_groups(struct intel_gvt *gvt)
	{
	int i;
	struct attribute_group *group;

	for (i = 0; i < gvt->num_types; i++) {
	group = gvt_vgpu_type_groups[i];
	gvt_vgpu_type_groups[i] = NULL;
	kfree(group);
	}
	}

	static const struct intel_gvt_ops intel_gvt_ops = {
	.emulate_cfg_read = intel_vgpu_emulate_cfg_read,
	.emulate_cfg_write = intel_vgpu_emulate_cfg_write,
	.emulate_mmio_read = intel_vgpu_emulate_mmio_read,
	.emulate_mmio_write = intel_vgpu_emulate_mmio_write,
	.vgpu_create = intel_gvt_create_vgpu,
	.vgpu_destroy = intel_gvt_destroy_vgpu,
	.vgpu_release = intel_gvt_release_vgpu,
	.vgpu_reset = intel_gvt_reset_vgpu,
	.vgpu_activate = intel_gvt_activate_vgpu,
	.vgpu_deactivate = intel_gvt_deactivate_vgpu,
	.gvt_find_vgpu_type = intel_gvt_find_vgpu_type,
	.get_gvt_attrs = intel_get_gvt_attrs,
	.vgpu_query_plane = intel_vgpu_query_plane,
	.vgpu_get_dmabuf = intel_vgpu_get_dmabuf,
	.write_protect_handler = intel_vgpu_page_track_handler,
	};

	/**
	* intel_gvt_init_host - Load MPT modules and detect if we're running in host
	* @gvt: intel gvt device
	*
	* This function is called at the driver loading stage. If failed to find a
	* loadable MPT module or detect currently we're running in a VM, then GVT-g
	* will be disabled
	*
	* Returns:
	* Zero on success, negative error code if failed.
	*
	*/
	int intel_gvt_init_host(void)
	{
	if (intel_gvt_host.initialized)
	return 0;

	/* Xen DOM U */
	if (xen_domain() && !xen_initial_domain())
	return -ENODEV;

	/* Try to load MPT modules for hypervisors */
	if (xen_initial_domain()) {
	/* In Xen dom0 */
	intel_gvt_host.mpt = try_then_request_module(
	symbol_get(xengt_mpt), "xengt");
	intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_XEN;
	} else {
	#if IS_ENABLED(CONFIG_DRM_I915_GVT_KVMGT)
	/* not in Xen. Try KVMGT */
	intel_gvt_host.mpt = try_then_request_module(
	symbol_get(kvmgt_mpt), "kvmgt");
	intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_KVM;
	#endif
	}

	/* Fail to load MPT modules - bail out */
	if (!intel_gvt_host.mpt)
	return -EINVAL;

	gvt_dbg_core("Running with hypervisor %s in host mode\n",
	supported_hypervisors[intel_gvt_host.hypervisor_type]);

	intel_gvt_host.initialized = true;
	return 0;
	}

	static void init_device_info(struct intel_gvt *gvt)
	{
	struct intel_gvt_device_info *info = &gvt->device_info;
	struct pci_dev *pdev = gvt->dev_priv->drm.pdev;

	info->max_support_vgpus = 8;
	info->cfg_space_size = PCI_CFG_SPACE_EXP_SIZE;
	info->mmio_size = 2 * 1024 * 1024;
	info->mmio_bar = 0;
	info->gtt_start_offset = 8 * 1024 * 1024;
	info->gtt_entry_size = 8;
	info->gtt_entry_size_shift = 3;
	info->gmadr_bytes_in_cmd = 8;
	info->max_surface_size = 36 * 1024 * 1024;
	info->msi_cap_offset = pdev->msi_cap;
	}

	static int gvt_service_thread(void *data)
	{
	struct intel_gvt gvt = (struct intel_gvt )data;
	int ret;

	gvt_dbg_core("service thread start\n");

	while (!kthread_should_stop()) {
	ret = wait_event_interruptible(gvt->service_thread_wq,
	kthread_should_stop() \|\| gvt->service_request);

	if (kthread_should_stop())
	break;

	if (WARN_ONCE(ret, "service thread is waken up by signal.\n"))
	continue;

	if (test_and_clear_bit(INTEL_GVT_REQUEST_EMULATE_VBLANK,
	(void *)&gvt->service_request))
	intel_gvt_emulate_vblank(gvt);

	if (test_bit(INTEL_GVT_REQUEST_SCHED,
	(void *)&gvt->service_request) \|\|
	test_bit(INTEL_GVT_REQUEST_EVENT_SCHED,
	(void *)&gvt->service_request)) {
	intel_gvt_schedule(gvt);
	}
	}

	return 0;
	}

	static void clean_service_thread(struct intel_gvt *gvt)
	{
	kthread_stop(gvt->service_thread);
	}

	static int init_service_thread(struct intel_gvt *gvt)
	{
	init_waitqueue_head(&gvt->service_thread_wq);

	gvt->service_thread = kthread_run(gvt_service_thread,
	gvt, "gvt_service_thread");
	if (IS_ERR(gvt->service_thread)) {
	gvt_err("fail to start service thread.\n");
	return PTR_ERR(gvt->service_thread);
	}
	return 0;
	}

	/**
	* intel_gvt_clean_device - clean a GVT device
	* @gvt: intel gvt device
	*
	* This function is called at the driver unloading stage, to free the
	* resources owned by a GVT device.
	*
	*/
	void intel_gvt_clean_device(struct drm_i915_private *dev_priv)
	{
	struct intel_gvt *gvt = to_gvt(dev_priv);

	if (WARN_ON(!gvt))
	return;

	intel_gvt_destroy_idle_vgpu(gvt->idle_vgpu);
	intel_gvt_hypervisor_host_exit(&dev_priv->drm.pdev->dev, gvt);
	intel_gvt_cleanup_vgpu_type_groups(gvt);
	intel_gvt_clean_vgpu_types(gvt);

	intel_gvt_debugfs_clean(gvt);
	clean_service_thread(gvt);
	intel_gvt_clean_cmd_parser(gvt);
	intel_gvt_clean_sched_policy(gvt);
	intel_gvt_clean_workload_scheduler(gvt);
	intel_gvt_clean_gtt(gvt);
	intel_gvt_clean_irq(gvt);
	intel_gvt_free_firmware(gvt);
	intel_gvt_clean_mmio_info(gvt);
	idr_destroy(&gvt->vgpu_idr);

	kfree(dev_priv->gvt);
	dev_priv->gvt = NULL;
	}

	/**
	* intel_gvt_init_device - initialize a GVT device
	* @dev_priv: drm i915 private data
	*
	* This function is called at the initialization stage, to initialize
	* necessary GVT components.
	*
	* Returns:
	* Zero on success, negative error code if failed.
	*
	*/
	int intel_gvt_init_device(struct drm_i915_private *dev_priv)
	{
	struct intel_gvt *gvt;
	struct intel_vgpu *vgpu;
	int ret;

	/*
	* Cannot initialize GVT device without intel_gvt_host gets
	* initialized first.
	*/
	if (WARN_ON(!intel_gvt_host.initialized))
	return -EINVAL;

	if (WARN_ON(dev_priv->gvt))
	return -EEXIST;

	gvt = kzalloc(sizeof(struct intel_gvt), GFP_KERNEL);
	if (!gvt)
	return -ENOMEM;

	gvt_dbg_core("init gvt device\n");

	idr_init(&gvt->vgpu_idr);
	spin_lock_init(&gvt->scheduler.mmio_context_lock);
	mutex_init(&gvt->lock);
	mutex_init(&gvt->sched_lock);
	gvt->dev_priv = dev_priv;

	init_device_info(gvt);

	ret = intel_gvt_setup_mmio_info(gvt);
	if (ret)
	goto out_clean_idr;

	intel_gvt_init_engine_mmio_context(gvt);

	ret = intel_gvt_load_firmware(gvt);
	if (ret)
	goto out_clean_mmio_info;

	ret = intel_gvt_init_irq(gvt);
	if (ret)
	goto out_free_firmware;

	ret = intel_gvt_init_gtt(gvt);
	if (ret)
	goto out_clean_irq;

	ret = intel_gvt_init_workload_scheduler(gvt);
	if (ret)
	goto out_clean_gtt;

	ret = intel_gvt_init_sched_policy(gvt);
	if (ret)
	goto out_clean_workload_scheduler;

	ret = intel_gvt_init_cmd_parser(gvt);
	if (ret)
	goto out_clean_sched_policy;

	ret = init_service_thread(gvt);
	if (ret)
	goto out_clean_cmd_parser;

	ret = intel_gvt_init_vgpu_types(gvt);
	if (ret)
	goto out_clean_thread;

	ret = intel_gvt_init_vgpu_type_groups(gvt);
	if (ret == false) {
	gvt_err("failed to init vgpu type groups: %d\n", ret);
	goto out_clean_types;
	}

	ret = intel_gvt_hypervisor_host_init(&dev_priv->drm.pdev->dev, gvt,
	&intel_gvt_ops);
	if (ret) {
	gvt_err("failed to register gvt-g host device: %d\n", ret);
	goto out_clean_types;
	}

	vgpu = intel_gvt_create_idle_vgpu(gvt);
	if (IS_ERR(vgpu)) {
	ret = PTR_ERR(vgpu);
	gvt_err("failed to create idle vgpu\n");
	goto out_clean_types;
	}
	gvt->idle_vgpu = vgpu;

	ret = intel_gvt_debugfs_init(gvt);
	if (ret)
	gvt_err("debugfs registeration failed, go on.\n");

	gvt_dbg_core("gvt device initialization is done\n");
	dev_priv->gvt = gvt;
	return 0;

	out_clean_types:
	intel_gvt_clean_vgpu_types(gvt);
	out_clean_thread:
	clean_service_thread(gvt);
	out_clean_cmd_parser:
	intel_gvt_clean_cmd_parser(gvt);
	out_clean_sched_policy:
	intel_gvt_clean_sched_policy(gvt);
	out_clean_workload_scheduler:
	intel_gvt_clean_workload_scheduler(gvt);
	out_clean_gtt:
	intel_gvt_clean_gtt(gvt);
	out_clean_irq:
	intel_gvt_clean_irq(gvt);
	out_free_firmware:
	intel_gvt_free_firmware(gvt);
	out_clean_mmio_info:
	intel_gvt_clean_mmio_info(gvt);
	out_clean_idr:
	idr_destroy(&gvt->vgpu_idr);
	kfree(gvt);
	return ret;
	}

	#if IS_ENABLED(CONFIG_DRM_I915_GVT_KVMGT)
	MODULE_SOFTDEP("pre: kvmgt");
	#endif