drivers/gpu/drm/i915/gvt/display.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:
  *    Ke Yu
  *    Zhiyuan Lv <zhiyuan.lv@intel.com>
  *
  * Contributors:
  *    Terrence Xu <terrence.xu@intel.com>
  *    Changbin Du <changbin.du@intel.com>
  *    Bing Niu <bing.niu@intel.com>
  *    Zhi Wang <zhi.a.wang@intel.com>
  *
  */

 #include "i915_drv.h"
 #include "gvt.h"

 static int get_edp_pipe(struct intel_vgpu *vgpu)
 {
 	u32 data = vgpu_vreg(vgpu, _TRANS_DDI_FUNC_CTL_EDP);
 	int pipe = -1;

 	switch (data & TRANS_DDI_EDP_INPUT_MASK) {
 	case TRANS_DDI_EDP_INPUT_A_ON:
 	case TRANS_DDI_EDP_INPUT_A_ONOFF:
 		pipe = PIPE_A;
 		break;
 	case TRANS_DDI_EDP_INPUT_B_ONOFF:
 		pipe = PIPE_B;
 		break;
 	case TRANS_DDI_EDP_INPUT_C_ONOFF:
 		pipe = PIPE_C;
 		break;
 	}
 	return pipe;
 }

 static int edp_pipe_is_enabled(struct intel_vgpu *vgpu)
 {
 	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;

 	if (!(vgpu_vreg(vgpu, PIPECONF(_PIPE_EDP)) & PIPECONF_ENABLE))
 		return 0;

 	if (!(vgpu_vreg(vgpu, _TRANS_DDI_FUNC_CTL_EDP) & TRANS_DDI_FUNC_ENABLE))
 		return 0;
 	return 1;
 }

 static int pipe_is_enabled(struct intel_vgpu *vgpu, int pipe)
 {
 	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;

 	if (WARN_ON(pipe < PIPE_A || pipe >= I915_MAX_PIPES))
 		return -EINVAL;

 	if (vgpu_vreg(vgpu, PIPECONF(pipe)) & PIPECONF_ENABLE)
 		return 1;

 	if (edp_pipe_is_enabled(vgpu) &&
 			get_edp_pipe(vgpu) == pipe)
 		return 1;
 	return 0;
 }

 /* EDID with 1024x768 as its resolution */
 static unsigned char virtual_dp_monitor_edid[] = {
 	/*Header*/
 	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
 	/* Vendor & Product Identification */
 	0x22, 0xf0, 0x54, 0x29, 0x00, 0x00, 0x00, 0x00, 0x04, 0x17,
 	/* Version & Revision */
 	0x01, 0x04,
 	/* Basic Display Parameters & Features */
 	0xa5, 0x34, 0x20, 0x78, 0x23,
 	/* Color Characteristics */
 	0xfc, 0x81, 0xa4, 0x55, 0x4d, 0x9d, 0x25, 0x12, 0x50, 0x54,
 	/* Established Timings: maximum resolution is 1024x768 */
 	0x21, 0x08, 0x00,
 	/* Standard Timings. All invalid */
 	0x00, 0xc0, 0x00, 0xc0, 0x00, 0x40, 0x00, 0x80, 0x00, 0x00,
 	0x00, 0x40, 0x00, 0x00, 0x00, 0x01,
 	/* 18 Byte Data Blocks 1: invalid */
 	0x00, 0x00, 0x80, 0xa0, 0x70, 0xb0,
 	0x23, 0x40, 0x30, 0x20, 0x36, 0x00, 0x06, 0x44, 0x21, 0x00, 0x00, 0x1a,
 	/* 18 Byte Data Blocks 2: invalid */
 	0x00, 0x00, 0x00, 0xfd, 0x00, 0x18, 0x3c, 0x18, 0x50, 0x11, 0x00, 0x0a,
 	0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
 	/* 18 Byte Data Blocks 3: invalid */
 	0x00, 0x00, 0x00, 0xfc, 0x00, 0x48,
 	0x50, 0x20, 0x5a, 0x52, 0x32, 0x34, 0x34, 0x30, 0x77, 0x0a, 0x20, 0x20,
 	/* 18 Byte Data Blocks 4: invalid */
 	0x00, 0x00, 0x00, 0xff, 0x00, 0x43, 0x4e, 0x34, 0x33, 0x30, 0x34, 0x30,
 	0x44, 0x58, 0x51, 0x0a, 0x20, 0x20,
 	/* Extension Block Count */
 	0x00,
 	/* Checksum */
 	0xef,
 };

 #define DPCD_HEADER_SIZE        0xb

 static u8 dpcd_fix_data[DPCD_HEADER_SIZE] = {
 	0x11, 0x0a, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 };

 static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
 {
 	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
 	vgpu_vreg(vgpu, SDEISR) &= ~(SDE_PORTB_HOTPLUG_CPT |
 			SDE_PORTC_HOTPLUG_CPT |
 			SDE_PORTD_HOTPLUG_CPT);

 	if (IS_SKYLAKE(dev_priv))
 		vgpu_vreg(vgpu, SDEISR) &= ~(SDE_PORTA_HOTPLUG_SPT |
 				SDE_PORTE_HOTPLUG_SPT);

 	if (intel_vgpu_has_monitor_on_port(vgpu, PORT_B))
 		vgpu_vreg(vgpu, SDEISR) |= SDE_PORTB_HOTPLUG_CPT;

 	if (intel_vgpu_has_monitor_on_port(vgpu, PORT_C))
 		vgpu_vreg(vgpu, SDEISR) |= SDE_PORTC_HOTPLUG_CPT;

 	if (intel_vgpu_has_monitor_on_port(vgpu, PORT_D))
 		vgpu_vreg(vgpu, SDEISR) |= SDE_PORTD_HOTPLUG_CPT;

 	if (IS_SKYLAKE(dev_priv) &&
 			intel_vgpu_has_monitor_on_port(vgpu, PORT_E)) {
 		vgpu_vreg(vgpu, SDEISR) |= SDE_PORTE_HOTPLUG_SPT;
 	}

 	if (intel_vgpu_has_monitor_on_port(vgpu, PORT_A)) {
 		if (IS_BROADWELL(dev_priv))
 			vgpu_vreg(vgpu, GEN8_DE_PORT_ISR) |=
 				GEN8_PORT_DP_A_HOTPLUG;
 		else
 			vgpu_vreg(vgpu, SDEISR) |= SDE_PORTA_HOTPLUG_SPT;
 	}
 }

 static void clean_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num)
 {
 	struct intel_vgpu_port *port = intel_vgpu_port(vgpu, port_num);

 	kfree(port->edid);
 	port->edid = NULL;

 	kfree(port->dpcd);
 	port->dpcd = NULL;
 }

 static int setup_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num,
 		int type)
 {
 	struct intel_vgpu_port *port = intel_vgpu_port(vgpu, port_num);

 	port->edid = kzalloc(sizeof(*(port->edid)), GFP_KERNEL);
 	if (!port->edid)
 		return -ENOMEM;

 	port->dpcd = kzalloc(sizeof(*(port->dpcd)), GFP_KERNEL);
 	if (!port->dpcd) {
 		kfree(port->edid);
 		return -ENOMEM;
 	}

 	memcpy(port->edid->edid_block, virtual_dp_monitor_edid,
 			EDID_SIZE);
 	port->edid->data_valid = true;

 	memcpy(port->dpcd->data, dpcd_fix_data, DPCD_HEADER_SIZE);
 	port->dpcd->data_valid = true;
 	port->dpcd->data[DPCD_SINK_COUNT] = 0x1;
 	port->type = type;

 	emulate_monitor_status_change(vgpu);
 	return 0;
 }

 /**
  * intel_gvt_check_vblank_emulation - check if vblank emulation timer should
  * be turned on/off when a virtual pipe is enabled/disabled.
  * @gvt: a GVT device
  *
  * This function is used to turn on/off vblank timer according to currently
  * enabled/disabled virtual pipes.
  *
  */
 void intel_gvt_check_vblank_emulation(struct intel_gvt *gvt)
 {
 	struct intel_gvt_irq *irq = &gvt->irq;
 	struct intel_vgpu *vgpu;
 	bool have_enabled_pipe = false;
 	int pipe, id;

 	if (WARN_ON(!mutex_is_locked(&gvt->lock)))
 		return;

 	hrtimer_cancel(&irq->vblank_timer.timer);

 	for_each_active_vgpu(gvt, vgpu, id) {
 		for (pipe = 0; pipe < I915_MAX_PIPES; pipe++) {
 			have_enabled_pipe =
 				pipe_is_enabled(vgpu, pipe);
 			if (have_enabled_pipe)
 				break;
 		}
 	}

 	if (have_enabled_pipe)
 		hrtimer_start(&irq->vblank_timer.timer,
 			ktime_add_ns(ktime_get(), irq->vblank_timer.period),
 			HRTIMER_MODE_ABS);
 }

 static void emulate_vblank_on_pipe(struct intel_vgpu *vgpu, int pipe)
 {
 	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
 	struct intel_vgpu_irq *irq = &vgpu->irq;
 	int vblank_event[] = {
 		[PIPE_A] = PIPE_A_VBLANK,
 		[PIPE_B] = PIPE_B_VBLANK,
 		[PIPE_C] = PIPE_C_VBLANK,
 	};
 	int event;

 	if (pipe < PIPE_A || pipe > PIPE_C)
 		return;

 	for_each_set_bit(event, irq->flip_done_event[pipe],
 			INTEL_GVT_EVENT_MAX) {
 		clear_bit(event, irq->flip_done_event[pipe]);
 		if (!pipe_is_enabled(vgpu, pipe))
 			continue;

 		vgpu_vreg(vgpu, PIPE_FLIPCOUNT_G4X(pipe))++;
 		intel_vgpu_trigger_virtual_event(vgpu, event);
 	}

 	if (pipe_is_enabled(vgpu, pipe)) {
 		vgpu_vreg(vgpu, PIPE_FRMCOUNT_G4X(pipe))++;
 		intel_vgpu_trigger_virtual_event(vgpu, vblank_event[pipe]);
 	}
 }

 static void emulate_vblank(struct intel_vgpu *vgpu)
 {
 	int pipe;

 	for_each_pipe(vgpu->gvt->dev_priv, pipe)
 		emulate_vblank_on_pipe(vgpu, pipe);
 }

 /**
  * intel_gvt_emulate_vblank - trigger vblank events for vGPUs on GVT device
  * @gvt: a GVT device
  *
  * This function is used to trigger vblank interrupts for vGPUs on GVT device
  *
  */
 void intel_gvt_emulate_vblank(struct intel_gvt *gvt)
 {
 	struct intel_vgpu *vgpu;
 	int id;

 	if (WARN_ON(!mutex_is_locked(&gvt->lock)))
 		return;

 	for_each_active_vgpu(gvt, vgpu, id)
 		emulate_vblank(vgpu);
 }

 /**
  * intel_vgpu_clean_display - clean vGPU virtual display emulation
  * @vgpu: a vGPU
  *
  * This function is used to clean vGPU virtual display emulation stuffs
  *
  */
 void intel_vgpu_clean_display(struct intel_vgpu *vgpu)
 {
 	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;

 	if (IS_SKYLAKE(dev_priv))
 		clean_virtual_dp_monitor(vgpu, PORT_D);
 	else
 		clean_virtual_dp_monitor(vgpu, PORT_B);
 }

 /**
  * intel_vgpu_init_display- initialize vGPU virtual display emulation
  * @vgpu: a vGPU
  *
  * This function is used to initialize vGPU virtual display emulation stuffs
  *
  * Returns:
  * Zero on success, negative error code if failed.
  *
  */
 int intel_vgpu_init_display(struct intel_vgpu *vgpu)
 {
 	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;

 	intel_vgpu_init_i2c_edid(vgpu);

 	if (IS_SKYLAKE(dev_priv))
 		return setup_virtual_dp_monitor(vgpu, PORT_D, GVT_DP_D);
 	else
 		return setup_virtual_dp_monitor(vgpu, PORT_B, GVT_DP_B);
 }
	/*
	* 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:
	* Ke Yu
	* Zhiyuan Lv <zhiyuan.lv@intel.com>
	*
	* Contributors:
	* Terrence Xu <terrence.xu@intel.com>
	* Changbin Du <changbin.du@intel.com>
	* Bing Niu <bing.niu@intel.com>
	* Zhi Wang <zhi.a.wang@intel.com>
	*
	*/

	#include "i915_drv.h"
	#include "gvt.h"

	static int get_edp_pipe(struct intel_vgpu *vgpu)
	{
	u32 data = vgpu_vreg(vgpu, _TRANS_DDI_FUNC_CTL_EDP);
	int pipe = -1;

	switch (data & TRANS_DDI_EDP_INPUT_MASK) {
	case TRANS_DDI_EDP_INPUT_A_ON:
	case TRANS_DDI_EDP_INPUT_A_ONOFF:
	pipe = PIPE_A;
	break;
	case TRANS_DDI_EDP_INPUT_B_ONOFF:
	pipe = PIPE_B;
	break;
	case TRANS_DDI_EDP_INPUT_C_ONOFF:
	pipe = PIPE_C;
	break;
	}
	return pipe;
	}

	static int edp_pipe_is_enabled(struct intel_vgpu *vgpu)
	{
	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;

	if (!(vgpu_vreg(vgpu, PIPECONF(_PIPE_EDP)) & PIPECONF_ENABLE))
	return 0;

	if (!(vgpu_vreg(vgpu, _TRANS_DDI_FUNC_CTL_EDP) & TRANS_DDI_FUNC_ENABLE))
	return 0;
	return 1;
	}

	static int pipe_is_enabled(struct intel_vgpu *vgpu, int pipe)
	{
	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;

	if (WARN_ON(pipe < PIPE_A \|\| pipe >= I915_MAX_PIPES))
	return -EINVAL;

	if (vgpu_vreg(vgpu, PIPECONF(pipe)) & PIPECONF_ENABLE)
	return 1;

	if (edp_pipe_is_enabled(vgpu) &&
	get_edp_pipe(vgpu) == pipe)
	return 1;
	return 0;
	}

	/* EDID with 1024x768 as its resolution */
	static unsigned char virtual_dp_monitor_edid[] = {
	/Header/
	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
	/* Vendor & Product Identification */
	0x22, 0xf0, 0x54, 0x29, 0x00, 0x00, 0x00, 0x00, 0x04, 0x17,
	/* Version & Revision */
	0x01, 0x04,
	/* Basic Display Parameters & Features */
	0xa5, 0x34, 0x20, 0x78, 0x23,
	/* Color Characteristics */
	0xfc, 0x81, 0xa4, 0x55, 0x4d, 0x9d, 0x25, 0x12, 0x50, 0x54,
	/* Established Timings: maximum resolution is 1024x768 */
	0x21, 0x08, 0x00,
	/* Standard Timings. All invalid */
	0x00, 0xc0, 0x00, 0xc0, 0x00, 0x40, 0x00, 0x80, 0x00, 0x00,
	0x00, 0x40, 0x00, 0x00, 0x00, 0x01,
	/* 18 Byte Data Blocks 1: invalid */
	0x00, 0x00, 0x80, 0xa0, 0x70, 0xb0,
	0x23, 0x40, 0x30, 0x20, 0x36, 0x00, 0x06, 0x44, 0x21, 0x00, 0x00, 0x1a,
	/* 18 Byte Data Blocks 2: invalid */
	0x00, 0x00, 0x00, 0xfd, 0x00, 0x18, 0x3c, 0x18, 0x50, 0x11, 0x00, 0x0a,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	/* 18 Byte Data Blocks 3: invalid */
	0x00, 0x00, 0x00, 0xfc, 0x00, 0x48,
	0x50, 0x20, 0x5a, 0x52, 0x32, 0x34, 0x34, 0x30, 0x77, 0x0a, 0x20, 0x20,
	/* 18 Byte Data Blocks 4: invalid */
	0x00, 0x00, 0x00, 0xff, 0x00, 0x43, 0x4e, 0x34, 0x33, 0x30, 0x34, 0x30,
	0x44, 0x58, 0x51, 0x0a, 0x20, 0x20,
	/* Extension Block Count */
	0x00,
	/* Checksum */
	0xef,
	};

	#define DPCD_HEADER_SIZE 0xb

	static u8 dpcd_fix_data[DPCD_HEADER_SIZE] = {
	0x11, 0x0a, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
	};

	static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
	{
	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
	vgpu_vreg(vgpu, SDEISR) &= ~(SDE_PORTB_HOTPLUG_CPT \|
	SDE_PORTC_HOTPLUG_CPT \|
	SDE_PORTD_HOTPLUG_CPT);

	if (IS_SKYLAKE(dev_priv))
	vgpu_vreg(vgpu, SDEISR) &= ~(SDE_PORTA_HOTPLUG_SPT \|
	SDE_PORTE_HOTPLUG_SPT);

	if (intel_vgpu_has_monitor_on_port(vgpu, PORT_B))
	vgpu_vreg(vgpu, SDEISR) \|= SDE_PORTB_HOTPLUG_CPT;

	if (intel_vgpu_has_monitor_on_port(vgpu, PORT_C))
	vgpu_vreg(vgpu, SDEISR) \|= SDE_PORTC_HOTPLUG_CPT;

	if (intel_vgpu_has_monitor_on_port(vgpu, PORT_D))
	vgpu_vreg(vgpu, SDEISR) \|= SDE_PORTD_HOTPLUG_CPT;

	if (IS_SKYLAKE(dev_priv) &&
	intel_vgpu_has_monitor_on_port(vgpu, PORT_E)) {
	vgpu_vreg(vgpu, SDEISR) \|= SDE_PORTE_HOTPLUG_SPT;
	}

	if (intel_vgpu_has_monitor_on_port(vgpu, PORT_A)) {
	if (IS_BROADWELL(dev_priv))
	vgpu_vreg(vgpu, GEN8_DE_PORT_ISR) \|=
	GEN8_PORT_DP_A_HOTPLUG;
	else
	vgpu_vreg(vgpu, SDEISR) \|= SDE_PORTA_HOTPLUG_SPT;
	}
	}

	static void clean_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num)
	{
	struct intel_vgpu_port *port = intel_vgpu_port(vgpu, port_num);

	kfree(port->edid);
	port->edid = NULL;

	kfree(port->dpcd);
	port->dpcd = NULL;
	}

	static int setup_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num,
	int type)
	{
	struct intel_vgpu_port *port = intel_vgpu_port(vgpu, port_num);

	port->edid = kzalloc(sizeof(*(port->edid)), GFP_KERNEL);
	if (!port->edid)
	return -ENOMEM;

	port->dpcd = kzalloc(sizeof(*(port->dpcd)), GFP_KERNEL);
	if (!port->dpcd) {
	kfree(port->edid);
	return -ENOMEM;
	}

	memcpy(port->edid->edid_block, virtual_dp_monitor_edid,
	EDID_SIZE);
	port->edid->data_valid = true;

	memcpy(port->dpcd->data, dpcd_fix_data, DPCD_HEADER_SIZE);
	port->dpcd->data_valid = true;
	port->dpcd->data[DPCD_SINK_COUNT] = 0x1;
	port->type = type;

	emulate_monitor_status_change(vgpu);
	return 0;
	}

	/**
	* intel_gvt_check_vblank_emulation - check if vblank emulation timer should
	* be turned on/off when a virtual pipe is enabled/disabled.
	* @gvt: a GVT device
	*
	* This function is used to turn on/off vblank timer according to currently
	* enabled/disabled virtual pipes.
	*
	*/
	void intel_gvt_check_vblank_emulation(struct intel_gvt *gvt)
	{
	struct intel_gvt_irq *irq = &gvt->irq;
	struct intel_vgpu *vgpu;
	bool have_enabled_pipe = false;
	int pipe, id;

	if (WARN_ON(!mutex_is_locked(&gvt->lock)))
	return;

	hrtimer_cancel(&irq->vblank_timer.timer);

	for_each_active_vgpu(gvt, vgpu, id) {
	for (pipe = 0; pipe < I915_MAX_PIPES; pipe++) {
	have_enabled_pipe =
	pipe_is_enabled(vgpu, pipe);
	if (have_enabled_pipe)
	break;
	}
	}

	if (have_enabled_pipe)
	hrtimer_start(&irq->vblank_timer.timer,
	ktime_add_ns(ktime_get(), irq->vblank_timer.period),
	HRTIMER_MODE_ABS);
	}

	static void emulate_vblank_on_pipe(struct intel_vgpu *vgpu, int pipe)
	{
	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
	struct intel_vgpu_irq *irq = &vgpu->irq;
	int vblank_event[] = {
	[PIPE_A] = PIPE_A_VBLANK,
	[PIPE_B] = PIPE_B_VBLANK,
	[PIPE_C] = PIPE_C_VBLANK,
	};
	int event;

	if (pipe < PIPE_A \|\| pipe > PIPE_C)
	return;

	for_each_set_bit(event, irq->flip_done_event[pipe],
	INTEL_GVT_EVENT_MAX) {
	clear_bit(event, irq->flip_done_event[pipe]);
	if (!pipe_is_enabled(vgpu, pipe))
	continue;

	vgpu_vreg(vgpu, PIPE_FLIPCOUNT_G4X(pipe))++;
	intel_vgpu_trigger_virtual_event(vgpu, event);
	}

	if (pipe_is_enabled(vgpu, pipe)) {
	vgpu_vreg(vgpu, PIPE_FRMCOUNT_G4X(pipe))++;
	intel_vgpu_trigger_virtual_event(vgpu, vblank_event[pipe]);
	}
	}

	static void emulate_vblank(struct intel_vgpu *vgpu)
	{
	int pipe;

	for_each_pipe(vgpu->gvt->dev_priv, pipe)
	emulate_vblank_on_pipe(vgpu, pipe);
	}

	/**
	* intel_gvt_emulate_vblank - trigger vblank events for vGPUs on GVT device
	* @gvt: a GVT device
	*
	* This function is used to trigger vblank interrupts for vGPUs on GVT device
	*
	*/
	void intel_gvt_emulate_vblank(struct intel_gvt *gvt)
	{
	struct intel_vgpu *vgpu;
	int id;

	if (WARN_ON(!mutex_is_locked(&gvt->lock)))
	return;

	for_each_active_vgpu(gvt, vgpu, id)
	emulate_vblank(vgpu);
	}

	/**
	* intel_vgpu_clean_display - clean vGPU virtual display emulation
	* @vgpu: a vGPU
	*
	* This function is used to clean vGPU virtual display emulation stuffs
	*
	*/
	void intel_vgpu_clean_display(struct intel_vgpu *vgpu)
	{
	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;

	if (IS_SKYLAKE(dev_priv))
	clean_virtual_dp_monitor(vgpu, PORT_D);
	else
	clean_virtual_dp_monitor(vgpu, PORT_B);
	}

	/**
	* intel_vgpu_init_display- initialize vGPU virtual display emulation
	* @vgpu: a vGPU
	*
	* This function is used to initialize vGPU virtual display emulation stuffs
	*
	* Returns:
	* Zero on success, negative error code if failed.
	*
	*/
	int intel_vgpu_init_display(struct intel_vgpu *vgpu)
	{
	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;

	intel_vgpu_init_i2c_edid(vgpu);

	if (IS_SKYLAKE(dev_priv))
	return setup_virtual_dp_monitor(vgpu, PORT_D, GVT_DP_D);
	else
	return setup_virtual_dp_monitor(vgpu, PORT_B, GVT_DP_B);
	}