1 files changed, 592 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
new file mode 100644
index 000000000..9cf769f8e
--- /dev/null
+++ b/drivers/gpu/drm/i915/gvt/vgpu.c
@@ -0,0 +1,592 @@
+/*
+ * 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:
+ *    Eddie Dong <eddie.dong@intel.com>
+ *    Kevin Tian <kevin.tian@intel.com>
+ *
+ * Contributors:
+ *    Ping Gao <ping.a.gao@intel.com>
+ *    Zhi Wang <zhi.a.wang@intel.com>
+ *    Bing Niu <bing.niu@intel.com>
+ *
+ */
+
+#include "i915_drv.h"
+#include "gvt.h"
+#include "i915_pvinfo.h"
+
+void populate_pvinfo_page(struct intel_vgpu *vgpu)
+{
+	/* setup the ballooning information */
+	vgpu_vreg64_t(vgpu, vgtif_reg(magic)) = VGT_MAGIC;
+	vgpu_vreg_t(vgpu, vgtif_reg(version_major)) = 1;
+	vgpu_vreg_t(vgpu, vgtif_reg(version_minor)) = 0;
+	vgpu_vreg_t(vgpu, vgtif_reg(display_ready)) = 0;
+	vgpu_vreg_t(vgpu, vgtif_reg(vgt_id)) = vgpu->id;
+
+	vgpu_vreg_t(vgpu, vgtif_reg(vgt_caps)) = VGT_CAPS_FULL_48BIT_PPGTT;
+	vgpu_vreg_t(vgpu, vgtif_reg(vgt_caps)) |= VGT_CAPS_HWSP_EMULATION;
+	vgpu_vreg_t(vgpu, vgtif_reg(vgt_caps)) |= VGT_CAPS_HUGE_GTT;
+
+	vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.mappable_gmadr.base)) =
+		vgpu_aperture_gmadr_base(vgpu);
+	vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.mappable_gmadr.size)) =
+		vgpu_aperture_sz(vgpu);
+	vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.nonmappable_gmadr.base)) =
+		vgpu_hidden_gmadr_base(vgpu);
+	vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.nonmappable_gmadr.size)) =
+		vgpu_hidden_sz(vgpu);
+
+	vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.fence_num)) = vgpu_fence_sz(vgpu);
+
+	vgpu_vreg_t(vgpu, vgtif_reg(cursor_x_hot)) = UINT_MAX;
+	vgpu_vreg_t(vgpu, vgtif_reg(cursor_y_hot)) = UINT_MAX;
+
+	gvt_dbg_core("Populate PVINFO PAGE for vGPU %d\n", vgpu->id);
+	gvt_dbg_core("aperture base [GMADR] 0x%llx size 0x%llx\n",
+		vgpu_aperture_gmadr_base(vgpu), vgpu_aperture_sz(vgpu));
+	gvt_dbg_core("hidden base [GMADR] 0x%llx size=0x%llx\n",
+		vgpu_hidden_gmadr_base(vgpu), vgpu_hidden_sz(vgpu));
+	gvt_dbg_core("fence size %d\n", vgpu_fence_sz(vgpu));
+
+	WARN_ON(sizeof(struct vgt_if) != VGT_PVINFO_SIZE);
+}
+
+#define VGPU_MAX_WEIGHT 16
+#define VGPU_WEIGHT(vgpu_num)	\
+	(VGPU_MAX_WEIGHT / (vgpu_num))
+
+static struct {
+	unsigned int low_mm;
+	unsigned int high_mm;
+	unsigned int fence;
+
+	/* A vGPU with a weight of 8 will get twice as much GPU as a vGPU
+	 * with a weight of 4 on a contended host, different vGPU type has
+	 * different weight set. Legal weights range from 1 to 16.
+	 */
+	unsigned int weight;
+	enum intel_vgpu_edid edid;
+	char *name;
+} vgpu_types[] = {
+/* Fixed vGPU type table */
+	{ MB_TO_BYTES(64), MB_TO_BYTES(384), 4, VGPU_WEIGHT(8), GVT_EDID_1024_768, "8" },
+	{ MB_TO_BYTES(128), MB_TO_BYTES(512), 4, VGPU_WEIGHT(4), GVT_EDID_1920_1200, "4" },
+	{ MB_TO_BYTES(256), MB_TO_BYTES(1024), 4, VGPU_WEIGHT(2), GVT_EDID_1920_1200, "2" },
+	{ MB_TO_BYTES(512), MB_TO_BYTES(2048), 4, VGPU_WEIGHT(1), GVT_EDID_1920_1200, "1" },
+};
+
+/**
+ * intel_gvt_init_vgpu_types - initialize vGPU type list
+ * @gvt : GVT device
+ *
+ * Initialize vGPU type list based on available resource.
+ *
+ */
+int intel_gvt_init_vgpu_types(struct intel_gvt *gvt)
+{
+	unsigned int num_types;
+	unsigned int i, low_avail, high_avail;
+	unsigned int min_low;
+
+	/* vGPU type name is defined as GVTg_Vx_y which contains
+	 * physical GPU generation type (e.g V4 as BDW server, V5 as
+	 * SKL server).
+	 *
+	 * Depend on physical SKU resource, might see vGPU types like
+	 * GVTg_V4_8, GVTg_V4_4, GVTg_V4_2, etc. We can create
+	 * different types of vGPU on same physical GPU depending on
+	 * available resource. Each vGPU type will have "avail_instance"
+	 * to indicate how many vGPU instance can be created for this
+	 * type.
+	 *
+	 */
+	low_avail = gvt_aperture_sz(gvt) - HOST_LOW_GM_SIZE;
+	high_avail = gvt_hidden_sz(gvt) - HOST_HIGH_GM_SIZE;
+	num_types = sizeof(vgpu_types) / sizeof(vgpu_types[0]);
+
+	gvt->types = kcalloc(num_types, sizeof(struct intel_vgpu_type),
+			     GFP_KERNEL);
+	if (!gvt->types)
+		return -ENOMEM;
+
+	min_low = MB_TO_BYTES(32);
+	for (i = 0; i < num_types; ++i) {
+		if (low_avail / vgpu_types[i].low_mm == 0)
+			break;
+
+		gvt->types[i].low_gm_size = vgpu_types[i].low_mm;
+		gvt->types[i].high_gm_size = vgpu_types[i].high_mm;
+		gvt->types[i].fence = vgpu_types[i].fence;
+
+		if (vgpu_types[i].weight < 1 ||
+					vgpu_types[i].weight > VGPU_MAX_WEIGHT)
+			return -EINVAL;
+
+		gvt->types[i].weight = vgpu_types[i].weight;
+		gvt->types[i].resolution = vgpu_types[i].edid;
+		gvt->types[i].avail_instance = min(low_avail / vgpu_types[i].low_mm,
+						   high_avail / vgpu_types[i].high_mm);
+
+		if (IS_GEN8(gvt->dev_priv))
+			sprintf(gvt->types[i].name, "GVTg_V4_%s",
+						vgpu_types[i].name);
+		else if (IS_GEN9(gvt->dev_priv))
+			sprintf(gvt->types[i].name, "GVTg_V5_%s",
+						vgpu_types[i].name);
+
+		gvt_dbg_core("type[%d]: %s avail %u low %u high %u fence %u weight %u res %s\n",
+			     i, gvt->types[i].name,
+			     gvt->types[i].avail_instance,
+			     gvt->types[i].low_gm_size,
+			     gvt->types[i].high_gm_size, gvt->types[i].fence,
+			     gvt->types[i].weight,
+			     vgpu_edid_str(gvt->types[i].resolution));
+	}
+
+	gvt->num_types = i;
+	return 0;
+}
+
+void intel_gvt_clean_vgpu_types(struct intel_gvt *gvt)
+{
+	kfree(gvt->types);
+}
+
+static void intel_gvt_update_vgpu_types(struct intel_gvt *gvt)
+{
+	int i;
+	unsigned int low_gm_avail, high_gm_avail, fence_avail;
+	unsigned int low_gm_min, high_gm_min, fence_min;
+
+	/* Need to depend on maxium hw resource size but keep on
+	 * static config for now.
+	 */
+	low_gm_avail = gvt_aperture_sz(gvt) - HOST_LOW_GM_SIZE -
+		gvt->gm.vgpu_allocated_low_gm_size;
+	high_gm_avail = gvt_hidden_sz(gvt) - HOST_HIGH_GM_SIZE -
+		gvt->gm.vgpu_allocated_high_gm_size;
+	fence_avail = gvt_fence_sz(gvt) - HOST_FENCE -
+		gvt->fence.vgpu_allocated_fence_num;
+
+	for (i = 0; i < gvt->num_types; i++) {
+		low_gm_min = low_gm_avail / gvt->types[i].low_gm_size;
+		high_gm_min = high_gm_avail / gvt->types[i].high_gm_size;
+		fence_min = fence_avail / gvt->types[i].fence;
+		gvt->types[i].avail_instance = min(min(low_gm_min, high_gm_min),
+						   fence_min);
+
+		gvt_dbg_core("update type[%d]: %s avail %u low %u high %u fence %u\n",
+		       i, gvt->types[i].name,
+		       gvt->types[i].avail_instance, gvt->types[i].low_gm_size,
+		       gvt->types[i].high_gm_size, gvt->types[i].fence);
+	}
+}
+
+/**
+ * intel_gvt_active_vgpu - activate a virtual GPU
+ * @vgpu: virtual GPU
+ *
+ * This function is called when user wants to activate a virtual GPU.
+ *
+ */
+void intel_gvt_activate_vgpu(struct intel_vgpu *vgpu)
+{
+	mutex_lock(&vgpu->gvt->lock);
+	vgpu->active = true;
+	mutex_unlock(&vgpu->gvt->lock);
+}
+
+/**
+ * intel_gvt_deactive_vgpu - deactivate a virtual GPU
+ * @vgpu: virtual GPU
+ *
+ * This function is called when user wants to deactivate a virtual GPU.
+ * The virtual GPU will be stopped.
+ *
+ */
+void intel_gvt_deactivate_vgpu(struct intel_vgpu *vgpu)
+{
+	mutex_lock(&vgpu->vgpu_lock);
+
+	vgpu->active = false;
+
+	if (atomic_read(&vgpu->submission.running_workload_num)) {
+		mutex_unlock(&vgpu->vgpu_lock);
+		intel_gvt_wait_vgpu_idle(vgpu);
+		mutex_lock(&vgpu->vgpu_lock);
+	}
+
+	intel_vgpu_stop_schedule(vgpu);
+
+	mutex_unlock(&vgpu->vgpu_lock);
+}
+
+/**
+ * intel_gvt_release_vgpu - release a virtual GPU
+ * @vgpu: virtual GPU
+ *
+ * This function is called when user wants to release a virtual GPU.
+ * The virtual GPU will be stopped and all runtime information will be
+ * destroyed.
+ *
+ */
+void intel_gvt_release_vgpu(struct intel_vgpu *vgpu)
+{
+	intel_gvt_deactivate_vgpu(vgpu);
+
+	mutex_lock(&vgpu->vgpu_lock);
+	intel_vgpu_clean_workloads(vgpu, ALL_ENGINES);
+	intel_vgpu_dmabuf_cleanup(vgpu);
+	mutex_unlock(&vgpu->vgpu_lock);
+}
+
+/**
+ * intel_gvt_destroy_vgpu - destroy a virtual GPU
+ * @vgpu: virtual GPU
+ *
+ * This function is called when user wants to destroy a virtual GPU.
+ *
+ */
+void intel_gvt_destroy_vgpu(struct intel_vgpu *vgpu)
+{
+	struct intel_gvt *gvt = vgpu->gvt;
+
+	WARN(vgpu->active, "vGPU is still active!\n");
+
+	/*
+	 * remove idr first so later clean can judge if need to stop
+	 * service if no active vgpu.
+	 */
+	mutex_lock(&gvt->lock);
+	idr_remove(&gvt->vgpu_idr, vgpu->id);
+	mutex_unlock(&gvt->lock);
+
+	mutex_lock(&vgpu->vgpu_lock);
+	intel_gvt_debugfs_remove_vgpu(vgpu);
+	intel_vgpu_clean_sched_policy(vgpu);
+	intel_vgpu_clean_submission(vgpu);
+	intel_vgpu_clean_display(vgpu);
+	intel_vgpu_clean_opregion(vgpu);
+	intel_vgpu_reset_ggtt(vgpu, true);
+	intel_vgpu_clean_gtt(vgpu);
+	intel_gvt_hypervisor_detach_vgpu(vgpu);
+	intel_vgpu_free_resource(vgpu);
+	intel_vgpu_clean_mmio(vgpu);
+	intel_vgpu_dmabuf_cleanup(vgpu);
+	mutex_unlock(&vgpu->vgpu_lock);
+
+	mutex_lock(&gvt->lock);
+	if (idr_is_empty(&gvt->vgpu_idr))
+		intel_gvt_clean_irq(gvt);
+	intel_gvt_update_vgpu_types(gvt);
+	mutex_unlock(&gvt->lock);
+
+	vfree(vgpu);
+}
+
+#define IDLE_VGPU_IDR 0
+
+/**
+ * intel_gvt_create_idle_vgpu - create an idle virtual GPU
+ * @gvt: GVT device
+ *
+ * This function is called when user wants to create an idle virtual GPU.
+ *
+ * Returns:
+ * pointer to intel_vgpu, error pointer if failed.
+ */
+struct intel_vgpu *intel_gvt_create_idle_vgpu(struct intel_gvt *gvt)
+{
+	struct intel_vgpu *vgpu;
+	enum intel_engine_id i;
+	int ret;
+
+	vgpu = vzalloc(sizeof(*vgpu));
+	if (!vgpu)
+		return ERR_PTR(-ENOMEM);
+
+	vgpu->id = IDLE_VGPU_IDR;
+	vgpu->gvt = gvt;
+	mutex_init(&vgpu->vgpu_lock);
+
+	for (i = 0; i < I915_NUM_ENGINES; i++)
+		INIT_LIST_HEAD(&vgpu->submission.workload_q_head[i]);
+
+	ret = intel_vgpu_init_sched_policy(vgpu);
+	if (ret)
+		goto out_free_vgpu;
+
+	vgpu->active = false;
+
+	return vgpu;
+
+out_free_vgpu:
+	vfree(vgpu);
+	return ERR_PTR(ret);
+}
+
+/**
+ * intel_gvt_destroy_vgpu - destroy an idle virtual GPU
+ * @vgpu: virtual GPU
+ *
+ * This function is called when user wants to destroy an idle virtual GPU.
+ *
+ */
+void intel_gvt_destroy_idle_vgpu(struct intel_vgpu *vgpu)
+{
+	mutex_lock(&vgpu->vgpu_lock);
+	intel_vgpu_clean_sched_policy(vgpu);
+	mutex_unlock(&vgpu->vgpu_lock);
+
+	vfree(vgpu);
+}
+
+static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt,
+		struct intel_vgpu_creation_params *param)
+{
+	struct intel_vgpu *vgpu;
+	int ret;
+
+	gvt_dbg_core("handle %llu low %llu MB high %llu MB fence %llu\n",
+			param->handle, param->low_gm_sz, param->high_gm_sz,
+			param->fence_sz);
+
+	vgpu = vzalloc(sizeof(*vgpu));
+	if (!vgpu)
+		return ERR_PTR(-ENOMEM);
+
+	ret = idr_alloc(&gvt->vgpu_idr, vgpu, IDLE_VGPU_IDR + 1, GVT_MAX_VGPU,
+		GFP_KERNEL);
+	if (ret < 0)
+		goto out_free_vgpu;
+
+	vgpu->id = ret;
+	vgpu->handle = param->handle;
+	vgpu->gvt = gvt;
+	vgpu->sched_ctl.weight = param->weight;
+	mutex_init(&vgpu->vgpu_lock);
+	mutex_init(&vgpu->dmabuf_lock);
+	INIT_LIST_HEAD(&vgpu->dmabuf_obj_list_head);
+	INIT_RADIX_TREE(&vgpu->page_track_tree, GFP_KERNEL);
+	idr_init(&vgpu->object_idr);
+	intel_vgpu_init_cfg_space(vgpu, param->primary);
+
+	ret = intel_vgpu_init_mmio(vgpu);
+	if (ret)
+		goto out_clean_idr;
+
+	ret = intel_vgpu_alloc_resource(vgpu, param);
+	if (ret)
+		goto out_clean_vgpu_mmio;
+
+	populate_pvinfo_page(vgpu);
+
+	ret = intel_gvt_hypervisor_attach_vgpu(vgpu);
+	if (ret)
+		goto out_clean_vgpu_resource;
+
+	ret = intel_vgpu_init_gtt(vgpu);
+	if (ret)
+		goto out_detach_hypervisor_vgpu;
+
+	ret = intel_vgpu_init_opregion(vgpu);
+	if (ret)
+		goto out_clean_gtt;
+
+	ret = intel_vgpu_init_display(vgpu, param->resolution);
+	if (ret)
+		goto out_clean_opregion;
+
+	ret = intel_vgpu_setup_submission(vgpu);
+	if (ret)
+		goto out_clean_display;
+
+	ret = intel_vgpu_init_sched_policy(vgpu);
+	if (ret)
+		goto out_clean_submission;
+
+	ret = intel_gvt_debugfs_add_vgpu(vgpu);
+	if (ret)
+		goto out_clean_sched_policy;
+
+	ret = intel_gvt_hypervisor_set_opregion(vgpu);
+	if (ret)
+		goto out_clean_sched_policy;
+
+	return vgpu;
+
+out_clean_sched_policy:
+	intel_vgpu_clean_sched_policy(vgpu);
+out_clean_submission:
+	intel_vgpu_clean_submission(vgpu);
+out_clean_display:
+	intel_vgpu_clean_display(vgpu);
+out_clean_opregion:
+	intel_vgpu_clean_opregion(vgpu);
+out_clean_gtt:
+	intel_vgpu_clean_gtt(vgpu);
+out_detach_hypervisor_vgpu:
+	intel_gvt_hypervisor_detach_vgpu(vgpu);
+out_clean_vgpu_resource:
+	intel_vgpu_free_resource(vgpu);
+out_clean_vgpu_mmio:
+	intel_vgpu_clean_mmio(vgpu);
+out_clean_idr:
+	idr_remove(&gvt->vgpu_idr, vgpu->id);
+out_free_vgpu:
+	vfree(vgpu);
+	return ERR_PTR(ret);
+}
+
+/**
+ * intel_gvt_create_vgpu - create a virtual GPU
+ * @gvt: GVT device
+ * @type: type of the vGPU to create
+ *
+ * This function is called when user wants to create a virtual GPU.
+ *
+ * Returns:
+ * pointer to intel_vgpu, error pointer if failed.
+ */
+struct intel_vgpu *intel_gvt_create_vgpu(struct intel_gvt *gvt,
+				struct intel_vgpu_type *type)
+{
+	struct intel_vgpu_creation_params param;
+	struct intel_vgpu *vgpu;
+
+	param.handle = 0;
+	param.primary = 1;
+	param.low_gm_sz = type->low_gm_size;
+	param.high_gm_sz = type->high_gm_size;
+	param.fence_sz = type->fence;
+	param.weight = type->weight;
+	param.resolution = type->resolution;
+
+	/* XXX current param based on MB */
+	param.low_gm_sz = BYTES_TO_MB(param.low_gm_sz);
+	param.high_gm_sz = BYTES_TO_MB(param.high_gm_sz);
+
+	mutex_lock(&gvt->lock);
+	vgpu = __intel_gvt_create_vgpu(gvt, &param);
+	if (!IS_ERR(vgpu))
+		/* calculate left instance change for types */
+		intel_gvt_update_vgpu_types(gvt);
+	mutex_unlock(&gvt->lock);
+
+	return vgpu;
+}
+
+/**
+ * intel_gvt_reset_vgpu_locked - reset a virtual GPU by DMLR or GT reset
+ * @vgpu: virtual GPU
+ * @dmlr: vGPU Device Model Level Reset or GT Reset
+ * @engine_mask: engines to reset for GT reset
+ *
+ * This function is called when user wants to reset a virtual GPU through
+ * device model reset or GT reset. The caller should hold the vgpu lock.
+ *
+ * vGPU Device Model Level Reset (DMLR) simulates the PCI level reset to reset
+ * the whole vGPU to default state as when it is created. This vGPU function
+ * is required both for functionary and security concerns.The ultimate goal
+ * of vGPU FLR is that reuse a vGPU instance by virtual machines. When we
+ * assign a vGPU to a virtual machine we must isse such reset first.
+ *
+ * Full GT Reset and Per-Engine GT Reset are soft reset flow for GPU engines
+ * (Render, Blitter, Video, Video Enhancement). It is defined by GPU Spec.
+ * Unlike the FLR, GT reset only reset particular resource of a vGPU per
+ * the reset request. Guest driver can issue a GT reset by programming the
+ * virtual GDRST register to reset specific virtual GPU engine or all
+ * engines.
+ *
+ * The parameter dev_level is to identify if we will do DMLR or GT reset.
+ * The parameter engine_mask is to specific the engines that need to be
+ * resetted. If value ALL_ENGINES is given for engine_mask, it means
+ * the caller requests a full GT reset that we will reset all virtual
+ * GPU engines. For FLR, engine_mask is ignored.
+ */
+void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
+				 unsigned int engine_mask)
+{
+	struct intel_gvt *gvt = vgpu->gvt;
+	struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
+	unsigned int resetting_eng = dmlr ? ALL_ENGINES : engine_mask;
+
+	gvt_dbg_core("------------------------------------------\n");
+	gvt_dbg_core("resseting vgpu%d, dmlr %d, engine_mask %08x\n",
+		     vgpu->id, dmlr, engine_mask);
+
+	vgpu->resetting_eng = resetting_eng;
+
+	intel_vgpu_stop_schedule(vgpu);
+	/*
+	 * The current_vgpu will set to NULL after stopping the
+	 * scheduler when the reset is triggered by current vgpu.
+	 */
+	if (scheduler->current_vgpu == NULL) {
+		mutex_unlock(&vgpu->vgpu_lock);
+		intel_gvt_wait_vgpu_idle(vgpu);
+		mutex_lock(&vgpu->vgpu_lock);
+	}
+
+	intel_vgpu_reset_submission(vgpu, resetting_eng);
+	/* full GPU reset or device model level reset */
+	if (engine_mask == ALL_ENGINES || dmlr) {
+		intel_vgpu_select_submission_ops(vgpu, ALL_ENGINES, 0);
+		intel_vgpu_invalidate_ppgtt(vgpu);
+		/*fence will not be reset during virtual reset */
+		if (dmlr) {
+			intel_vgpu_reset_gtt(vgpu);
+			intel_vgpu_reset_resource(vgpu);
+		}
+
+		intel_vgpu_reset_mmio(vgpu, dmlr);
+		populate_pvinfo_page(vgpu);
+
+		if (dmlr) {
+			intel_vgpu_reset_display(vgpu);
+			intel_vgpu_reset_cfg_space(vgpu);
+			/* only reset the failsafe mode when dmlr reset */
+			vgpu->failsafe = false;
+			vgpu->pv_notified = false;
+		}
+	}
+
+	vgpu->resetting_eng = 0;
+	gvt_dbg_core("reset vgpu%d done\n", vgpu->id);
+	gvt_dbg_core("------------------------------------------\n");
+}
+
+/**
+ * intel_gvt_reset_vgpu - reset a virtual GPU (Function Level)
+ * @vgpu: virtual GPU
+ *
+ * This function is called when user wants to reset a virtual GPU.
+ *
+ */
+void intel_gvt_reset_vgpu(struct intel_vgpu *vgpu)
+{
+	mutex_lock(&vgpu->vgpu_lock);
+	intel_gvt_reset_vgpu_locked(vgpu, true, 0);
+	mutex_unlock(&vgpu->vgpu_lock);
+}