drivers/gpu/drm/i915/gvt/opregion.c - linux/kernel/git/bpf/bpf - 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.
  */

 #include <linux/acpi.h>
 #include "i915_drv.h"
 #include "gvt.h"

 /*
  * Note: Only for GVT-g virtual VBT generation, other usage must
  * not do like this.
  */
 #define _INTEL_BIOS_PRIVATE
 #include "display/intel_vbt_defs.h"

 #define OPREGION_SIGNATURE "IntelGraphicsMem"
 #define MBOX_VBT      (1<<3)

 /* device handle */
 #define DEVICE_TYPE_CRT    0x01
 #define DEVICE_TYPE_EFP1   0x04
 #define DEVICE_TYPE_EFP2   0x40
 #define DEVICE_TYPE_EFP3   0x20
 #define DEVICE_TYPE_EFP4   0x10

 struct opregion_header {
 	u8 signature[16];
 	u32 size;
 	u32 opregion_ver;
 	u8 bios_ver[32];
 	u8 vbios_ver[16];
 	u8 driver_ver[16];
 	u32 mboxes;
 	u32 driver_model;
 	u32 pcon;
 	u8 dver[32];
 	u8 rsvd[124];
 } __packed;

 struct bdb_data_header {
 	u8 id;
 	u16 size; /* data size */
 } __packed;

 /* For supporting windows guest with opregion, here hardcode the emulated
  * bdb header version as '186', and the corresponding child_device_config
  * length should be '33' but not '38'.
  */
 struct efp_child_device_config {
 	u16 handle;
 	u16 device_type;
 	u16 device_class;
 	u8 i2c_speed;
 	u8 dp_onboard_redriver; /* 158 */
 	u8 dp_ondock_redriver; /* 158 */
 	u8 hdmi_level_shifter_value:4; /* 169 */
 	u8 hdmi_max_data_rate:4; /* 204 */
 	u16 dtd_buf_ptr; /* 161 */
 	u8 edidless_efp:1; /* 161 */
 	u8 compression_enable:1; /* 198 */
 	u8 compression_method:1; /* 198 */
 	u8 ganged_edp:1; /* 202 */
 	u8 skip0:4;
 	u8 compression_structure_index:4; /* 198 */
 	u8 skip1:4;
 	u8 slave_port; /*  202 */
 	u8 skip2;
 	u8 dvo_port;
 	u8 i2c_pin; /* for add-in card */
 	u8 slave_addr; /* for add-in card */
 	u8 ddc_pin;
 	u16 edid_ptr;
 	u8 dvo_config;
 	u8 efp_docked_port:1; /* 158 */
 	u8 lane_reversal:1; /* 184 */
 	u8 onboard_lspcon:1; /* 192 */
 	u8 iboost_enable:1; /* 196 */
 	u8 hpd_invert:1; /* BXT 196 */
 	u8 slip3:3;
 	u8 hdmi_compat:1;
 	u8 dp_compat:1;
 	u8 tmds_compat:1;
 	u8 skip4:5;
 	u8 aux_channel;
 	u8 dongle_detect;
 	u8 pipe_cap:2;
 	u8 sdvo_stall:1; /* 158 */
 	u8 hpd_status:2;
 	u8 integrated_encoder:1;
 	u8 skip5:2;
 	u8 dvo_wiring;
 	u8 mipi_bridge_type; /* 171 */
 	u16 device_class_ext;
 	u8 dvo_function;
 } __packed;

 struct vbt {
 	/* header->bdb_offset point to bdb_header offset */
 	struct vbt_header header;
 	struct bdb_header bdb_header;

 	struct bdb_data_header general_features_header;
 	struct bdb_general_features general_features;

 	struct bdb_data_header general_definitions_header;
 	struct bdb_general_definitions general_definitions;

 	struct efp_child_device_config child0;
 	struct efp_child_device_config child1;
 	struct efp_child_device_config child2;
 	struct efp_child_device_config child3;

 	struct bdb_data_header driver_features_header;
 	struct bdb_driver_features driver_features;
 };

 static void virt_vbt_generation(struct vbt *v)
 {
 	int num_child;

 	memset(v, 0, sizeof(struct vbt));

 	v->header.signature[0] = '$';
 	v->header.signature[1] = 'V';
 	v->header.signature[2] = 'B';
 	v->header.signature[3] = 'T';

 	/* there's features depending on version! */
 	v->header.version = 155;
 	v->header.header_size = sizeof(v->header);
 	v->header.vbt_size = sizeof(struct vbt) - sizeof(v->header);
 	v->header.bdb_offset = offsetof(struct vbt, bdb_header);

 	strcpy(&v->bdb_header.signature[0], "BIOS_DATA_BLOCK");
 	v->bdb_header.version = 186; /* child_dev_size = 33 */
 	v->bdb_header.header_size = sizeof(v->bdb_header);

 	v->bdb_header.bdb_size = sizeof(struct vbt) - sizeof(struct vbt_header)
 		- sizeof(struct bdb_header);

 	/* general features */
 	v->general_features_header.id = BDB_GENERAL_FEATURES;
 	v->general_features_header.size = sizeof(struct bdb_general_features);
 	v->general_features.int_crt_support = 0;
 	v->general_features.int_tv_support = 0;

 	/* child device */
 	num_child = 4; /* each port has one child */
 	v->general_definitions.child_dev_size =
 		sizeof(struct efp_child_device_config);
 	v->general_definitions_header.id = BDB_GENERAL_DEFINITIONS;
 	/* size will include child devices */
 	v->general_definitions_header.size =
 		sizeof(struct bdb_general_definitions) +
 			num_child * v->general_definitions.child_dev_size;

 	/* portA */
 	v->child0.handle = DEVICE_TYPE_EFP1;
 	v->child0.device_type = DEVICE_TYPE_DP;
 	v->child0.dvo_port = DVO_PORT_DPA;
 	v->child0.aux_channel = DP_AUX_A;
 	v->child0.dp_compat = true;
 	v->child0.integrated_encoder = true;

 	/* portB */
 	v->child1.handle = DEVICE_TYPE_EFP2;
 	v->child1.device_type = DEVICE_TYPE_DP;
 	v->child1.dvo_port = DVO_PORT_DPB;
 	v->child1.aux_channel = DP_AUX_B;
 	v->child1.dp_compat = true;
 	v->child1.integrated_encoder = true;

 	/* portC */
 	v->child2.handle = DEVICE_TYPE_EFP3;
 	v->child2.device_type = DEVICE_TYPE_DP;
 	v->child2.dvo_port = DVO_PORT_DPC;
 	v->child2.aux_channel = DP_AUX_C;
 	v->child2.dp_compat = true;
 	v->child2.integrated_encoder = true;

 	/* portD */
 	v->child3.handle = DEVICE_TYPE_EFP4;
 	v->child3.device_type = DEVICE_TYPE_DP;
 	v->child3.dvo_port = DVO_PORT_DPD;
 	v->child3.aux_channel = DP_AUX_D;
 	v->child3.dp_compat = true;
 	v->child3.integrated_encoder = true;

 	/* driver features */
 	v->driver_features_header.id = BDB_DRIVER_FEATURES;
 	v->driver_features_header.size = sizeof(struct bdb_driver_features);
 	v->driver_features.lvds_config = BDB_DRIVER_FEATURE_NO_LVDS;
 }

 /**
  * intel_vgpu_init_opregion - initialize the stuff used to emulate opregion
  * @vgpu: a vGPU
  *
  * Returns:
  * Zero on success, negative error code if failed.
  */
 int intel_vgpu_init_opregion(struct intel_vgpu *vgpu)
 {
 	u8 *buf;
 	struct opregion_header *header;
 	struct vbt v;
 	const char opregion_signature[16] = OPREGION_SIGNATURE;

 	gvt_dbg_core("init vgpu%d opregion\n", vgpu->id);
 	vgpu_opregion(vgpu)->va = (void *)__get_free_pages(GFP_KERNEL |
 			__GFP_ZERO,
 			get_order(INTEL_GVT_OPREGION_SIZE));
 	if (!vgpu_opregion(vgpu)->va) {
 		gvt_err("fail to get memory for vgpu virt opregion\n");
 		return -ENOMEM;
 	}

 	/* emulated opregion with VBT mailbox only */
 	buf = (u8 *)vgpu_opregion(vgpu)->va;
 	header = (struct opregion_header *)buf;
 	memcpy(header->signature, opregion_signature,
 	       sizeof(opregion_signature));
 	header->size = 0x8;
 	header->opregion_ver = 0x02000000;
 	header->mboxes = MBOX_VBT;

 	/* for unknown reason, the value in LID field is incorrect
 	 * which block the windows guest, so workaround it by force
 	 * setting it to "OPEN"
 	 */
 	buf[INTEL_GVT_OPREGION_CLID] = 0x3;

 	/* emulated vbt from virt vbt generation */
 	virt_vbt_generation(&v);
 	memcpy(buf + INTEL_GVT_OPREGION_VBT_OFFSET, &v, sizeof(struct vbt));

 	return 0;
 }

 static int map_vgpu_opregion(struct intel_vgpu *vgpu, bool map)
 {
 	u64 mfn;
 	int i, ret;

 	for (i = 0; i < INTEL_GVT_OPREGION_PAGES; i++) {
 		mfn = intel_gvt_hypervisor_virt_to_mfn(vgpu_opregion(vgpu)->va
 			+ i * PAGE_SIZE);
 		if (mfn == INTEL_GVT_INVALID_ADDR) {
 			gvt_vgpu_err("fail to get MFN from VA\n");
 			return -EINVAL;
 		}
 		ret = intel_gvt_hypervisor_map_gfn_to_mfn(vgpu,
 				vgpu_opregion(vgpu)->gfn[i],
 				mfn, 1, map);
 		if (ret) {
 			gvt_vgpu_err("fail to map GFN to MFN, errno: %d\n",
 				ret);
 			return ret;
 		}
 	}

 	vgpu_opregion(vgpu)->mapped = map;

 	return 0;
 }

 /**
  * intel_vgpu_opregion_base_write_handler - Opregion base register write handler
  *
  * @vgpu: a vGPU
  * @gpa: guest physical address of opregion
  *
  * Returns:
  * Zero on success, negative error code if failed.
  */
 int intel_vgpu_opregion_base_write_handler(struct intel_vgpu *vgpu, u32 gpa)
 {

 	int i, ret = 0;

 	gvt_dbg_core("emulate opregion from kernel\n");

 	switch (intel_gvt_host.hypervisor_type) {
 	case INTEL_GVT_HYPERVISOR_KVM:
 		for (i = 0; i < INTEL_GVT_OPREGION_PAGES; i++)
 			vgpu_opregion(vgpu)->gfn[i] = (gpa >> PAGE_SHIFT) + i;
 		break;
 	case INTEL_GVT_HYPERVISOR_XEN:
 		/**
 		 * Wins guest on Xengt will write this register twice: xen
 		 * hvmloader and windows graphic driver.
 		 */
 		if (vgpu_opregion(vgpu)->mapped)
 			map_vgpu_opregion(vgpu, false);

 		for (i = 0; i < INTEL_GVT_OPREGION_PAGES; i++)
 			vgpu_opregion(vgpu)->gfn[i] = (gpa >> PAGE_SHIFT) + i;

 		ret = map_vgpu_opregion(vgpu, true);
 		break;
 	default:
 		ret = -EINVAL;
 		gvt_vgpu_err("not supported hypervisor\n");
 	}

 	return ret;
 }

 /**
  * intel_vgpu_clean_opregion - clean the stuff used to emulate opregion
  * @vgpu: a vGPU
  *
  */
 void intel_vgpu_clean_opregion(struct intel_vgpu *vgpu)
 {
 	gvt_dbg_core("vgpu%d: clean vgpu opregion\n", vgpu->id);

 	if (!vgpu_opregion(vgpu)->va)
 		return;

 	if (intel_gvt_host.hypervisor_type == INTEL_GVT_HYPERVISOR_XEN) {
 		if (vgpu_opregion(vgpu)->mapped)
 			map_vgpu_opregion(vgpu, false);
 	} else if (intel_gvt_host.hypervisor_type == INTEL_GVT_HYPERVISOR_KVM) {
 		/* Guest opregion is released by VFIO */
 	}
 	free_pages((unsigned long)vgpu_opregion(vgpu)->va,
 		   get_order(INTEL_GVT_OPREGION_SIZE));

 	vgpu_opregion(vgpu)->va = NULL;

 }


 #define GVT_OPREGION_FUNC(scic)					\
 	({							\
 	 u32 __ret;						\
 	 __ret = (scic & OPREGION_SCIC_FUNC_MASK) >>		\
 	 OPREGION_SCIC_FUNC_SHIFT;				\
 	 __ret;							\
 	 })

 #define GVT_OPREGION_SUBFUNC(scic)				\
 	({							\
 	 u32 __ret;						\
 	 __ret = (scic & OPREGION_SCIC_SUBFUNC_MASK) >>		\
 	 OPREGION_SCIC_SUBFUNC_SHIFT;				\
 	 __ret;							\
 	 })

 static const char *opregion_func_name(u32 func)
 {
 	const char *name = NULL;

 	switch (func) {
 	case 0 ... 3:
 	case 5:
 	case 7 ... 15:
 		name = "Reserved";
 		break;

 	case 4:
 		name = "Get BIOS Data";
 		break;

 	case 6:
 		name = "System BIOS Callbacks";
 		break;

 	default:
 		name = "Unknown";
 		break;
 	}
 	return name;
 }

 static const char *opregion_subfunc_name(u32 subfunc)
 {
 	const char *name = NULL;

 	switch (subfunc) {
 	case 0:
 		name = "Supported Calls";
 		break;

 	case 1:
 		name = "Requested Callbacks";
 		break;

 	case 2 ... 3:
 	case 8 ... 9:
 		name = "Reserved";
 		break;

 	case 5:
 		name = "Boot Display";
 		break;

 	case 6:
 		name = "TV-Standard/Video-Connector";
 		break;

 	case 7:
 		name = "Internal Graphics";
 		break;

 	case 10:
 		name = "Spread Spectrum Clocks";
 		break;

 	case 11:
 		name = "Get AKSV";
 		break;

 	default:
 		name = "Unknown";
 		break;
 	}
 	return name;
 };

 static bool querying_capabilities(u32 scic)
 {
 	u32 func, subfunc;

 	func = GVT_OPREGION_FUNC(scic);
 	subfunc = GVT_OPREGION_SUBFUNC(scic);

 	if ((func == INTEL_GVT_OPREGION_SCIC_F_GETBIOSDATA &&
 		subfunc == INTEL_GVT_OPREGION_SCIC_SF_SUPPRTEDCALLS)
 		|| (func == INTEL_GVT_OPREGION_SCIC_F_GETBIOSDATA &&
 		 subfunc == INTEL_GVT_OPREGION_SCIC_SF_REQEUSTEDCALLBACKS)
 		|| (func == INTEL_GVT_OPREGION_SCIC_F_GETBIOSCALLBACKS &&
 		 subfunc == INTEL_GVT_OPREGION_SCIC_SF_SUPPRTEDCALLS)) {
 		return true;
 	}
 	return false;
 }

 /**
  * intel_vgpu_emulate_opregion_request - emulating OpRegion request
  * @vgpu: a vGPU
  * @swsci: SWSCI request
  *
  * Returns:
  * Zero on success, negative error code if failed
  */
 int intel_vgpu_emulate_opregion_request(struct intel_vgpu *vgpu, u32 swsci)
 {
 	u32 scic, parm;
 	u32 func, subfunc;
 	u64 scic_pa = 0, parm_pa = 0;
 	int ret;

 	switch (intel_gvt_host.hypervisor_type) {
 	case INTEL_GVT_HYPERVISOR_XEN:
 		scic = *((u32 *)vgpu_opregion(vgpu)->va +
 					INTEL_GVT_OPREGION_SCIC);
 		parm = *((u32 *)vgpu_opregion(vgpu)->va +
 					INTEL_GVT_OPREGION_PARM);
 		break;
 	case INTEL_GVT_HYPERVISOR_KVM:
 		scic_pa = (vgpu_opregion(vgpu)->gfn[0] << PAGE_SHIFT) +
 					INTEL_GVT_OPREGION_SCIC;
 		parm_pa = (vgpu_opregion(vgpu)->gfn[0] << PAGE_SHIFT) +
 					INTEL_GVT_OPREGION_PARM;

 		ret = intel_gvt_hypervisor_read_gpa(vgpu, scic_pa,
 						    &scic, sizeof(scic));
 		if (ret) {
 			gvt_vgpu_err("guest opregion read error %d, gpa 0x%llx, len %lu\n",
 				ret, scic_pa, sizeof(scic));
 			return ret;
 		}

 		ret = intel_gvt_hypervisor_read_gpa(vgpu, parm_pa,
 						    &parm, sizeof(parm));
 		if (ret) {
 			gvt_vgpu_err("guest opregion read error %d, gpa 0x%llx, len %lu\n",
 				ret, scic_pa, sizeof(scic));
 			return ret;
 		}

 		break;
 	default:
 		gvt_vgpu_err("not supported hypervisor\n");
 		return -EINVAL;
 	}

 	if (!(swsci & SWSCI_SCI_SELECT)) {
 		gvt_vgpu_err("requesting SMI service\n");
 		return 0;
 	}
 	/* ignore non 0->1 trasitions */
 	if ((vgpu_cfg_space(vgpu)[INTEL_GVT_PCI_SWSCI]
 				& SWSCI_SCI_TRIGGER) ||
 			!(swsci & SWSCI_SCI_TRIGGER)) {
 		return 0;
 	}

 	func = GVT_OPREGION_FUNC(scic);
 	subfunc = GVT_OPREGION_SUBFUNC(scic);
 	if (!querying_capabilities(scic)) {
 		gvt_vgpu_err("requesting runtime service: func \"%s\","
 				" subfunc \"%s\"\n",
 				opregion_func_name(func),
 				opregion_subfunc_name(subfunc));
 		/*
 		 * emulate exit status of function call, '0' means
 		 * "failure, generic, unsupported or unknown cause"
 		 */
 		scic &= ~OPREGION_SCIC_EXIT_MASK;
 		goto out;
 	}

 	scic = 0;
 	parm = 0;

 out:
 	switch (intel_gvt_host.hypervisor_type) {
 	case INTEL_GVT_HYPERVISOR_XEN:
 		*((u32 *)vgpu_opregion(vgpu)->va +
 					INTEL_GVT_OPREGION_SCIC) = scic;
 		*((u32 *)vgpu_opregion(vgpu)->va +
 					INTEL_GVT_OPREGION_PARM) = parm;
 		break;
 	case INTEL_GVT_HYPERVISOR_KVM:
 		ret = intel_gvt_hypervisor_write_gpa(vgpu, scic_pa,
 						    &scic, sizeof(scic));
 		if (ret) {
 			gvt_vgpu_err("guest opregion write error %d, gpa 0x%llx, len %lu\n",
 				ret, scic_pa, sizeof(scic));
 			return ret;
 		}

 		ret = intel_gvt_hypervisor_write_gpa(vgpu, parm_pa,
 						    &parm, sizeof(parm));
 		if (ret) {
 			gvt_vgpu_err("guest opregion write error %d, gpa 0x%llx, len %lu\n",
 				ret, scic_pa, sizeof(scic));
 			return ret;
 		}

 		break;
 	default:
 		gvt_vgpu_err("not supported hypervisor\n");
 		return -EINVAL;
 	}

 	return 0;
 }
	/*
	* 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.
	*/

	#include <linux/acpi.h>
	#include "i915_drv.h"
	#include "gvt.h"

	/*
	* Note: Only for GVT-g virtual VBT generation, other usage must
	* not do like this.
	*/
	#define _INTEL_BIOS_PRIVATE
	#include "display/intel_vbt_defs.h"

	#define OPREGION_SIGNATURE "IntelGraphicsMem"
	#define MBOX_VBT (1<<3)

	/* device handle */
	#define DEVICE_TYPE_CRT 0x01
	#define DEVICE_TYPE_EFP1 0x04
	#define DEVICE_TYPE_EFP2 0x40
	#define DEVICE_TYPE_EFP3 0x20
	#define DEVICE_TYPE_EFP4 0x10

	struct opregion_header {
	u8 signature[16];
	u32 size;
	u32 opregion_ver;
	u8 bios_ver[32];
	u8 vbios_ver[16];
	u8 driver_ver[16];
	u32 mboxes;
	u32 driver_model;
	u32 pcon;
	u8 dver[32];
	u8 rsvd[124];
	} __packed;

	struct bdb_data_header {
	u8 id;
	u16 size; /* data size */
	} __packed;

	/* For supporting windows guest with opregion, here hardcode the emulated
	* bdb header version as '186', and the corresponding child_device_config
	* length should be '33' but not '38'.
	*/
	struct efp_child_device_config {
	u16 handle;
	u16 device_type;
	u16 device_class;
	u8 i2c_speed;
	u8 dp_onboard_redriver; /* 158 */
	u8 dp_ondock_redriver; /* 158 */
	u8 hdmi_level_shifter_value:4; /* 169 */
	u8 hdmi_max_data_rate:4; /* 204 */
	u16 dtd_buf_ptr; /* 161 */
	u8 edidless_efp:1; /* 161 */
	u8 compression_enable:1; /* 198 */
	u8 compression_method:1; /* 198 */
	u8 ganged_edp:1; /* 202 */
	u8 skip0:4;
	u8 compression_structure_index:4; /* 198 */
	u8 skip1:4;
	u8 slave_port; /* 202 */
	u8 skip2;
	u8 dvo_port;
	u8 i2c_pin; /* for add-in card */
	u8 slave_addr; /* for add-in card */
	u8 ddc_pin;
	u16 edid_ptr;
	u8 dvo_config;
	u8 efp_docked_port:1; /* 158 */
	u8 lane_reversal:1; /* 184 */
	u8 onboard_lspcon:1; /* 192 */
	u8 iboost_enable:1; /* 196 */
	u8 hpd_invert:1; /* BXT 196 */
	u8 slip3:3;
	u8 hdmi_compat:1;
	u8 dp_compat:1;
	u8 tmds_compat:1;
	u8 skip4:5;
	u8 aux_channel;
	u8 dongle_detect;
	u8 pipe_cap:2;
	u8 sdvo_stall:1; /* 158 */
	u8 hpd_status:2;
	u8 integrated_encoder:1;
	u8 skip5:2;
	u8 dvo_wiring;
	u8 mipi_bridge_type; /* 171 */
	u16 device_class_ext;
	u8 dvo_function;
	} __packed;

	struct vbt {
	/* header->bdb_offset point to bdb_header offset */
	struct vbt_header header;
	struct bdb_header bdb_header;

	struct bdb_data_header general_features_header;
	struct bdb_general_features general_features;

	struct bdb_data_header general_definitions_header;
	struct bdb_general_definitions general_definitions;

	struct efp_child_device_config child0;
	struct efp_child_device_config child1;
	struct efp_child_device_config child2;
	struct efp_child_device_config child3;

	struct bdb_data_header driver_features_header;
	struct bdb_driver_features driver_features;
	};

	static void virt_vbt_generation(struct vbt *v)
	{
	int num_child;

	memset(v, 0, sizeof(struct vbt));

	v->header.signature[0] = '$';
	v->header.signature[1] = 'V';
	v->header.signature[2] = 'B';
	v->header.signature[3] = 'T';

	/* there's features depending on version! */
	v->header.version = 155;
	v->header.header_size = sizeof(v->header);
	v->header.vbt_size = sizeof(struct vbt) - sizeof(v->header);
	v->header.bdb_offset = offsetof(struct vbt, bdb_header);

	strcpy(&v->bdb_header.signature[0], "BIOS_DATA_BLOCK");
	v->bdb_header.version = 186; /* child_dev_size = 33 */
	v->bdb_header.header_size = sizeof(v->bdb_header);

	v->bdb_header.bdb_size = sizeof(struct vbt) - sizeof(struct vbt_header)
	- sizeof(struct bdb_header);

	/* general features */
	v->general_features_header.id = BDB_GENERAL_FEATURES;
	v->general_features_header.size = sizeof(struct bdb_general_features);
	v->general_features.int_crt_support = 0;
	v->general_features.int_tv_support = 0;

	/* child device */
	num_child = 4; /* each port has one child */
	v->general_definitions.child_dev_size =
	sizeof(struct efp_child_device_config);
	v->general_definitions_header.id = BDB_GENERAL_DEFINITIONS;
	/* size will include child devices */
	v->general_definitions_header.size =
	sizeof(struct bdb_general_definitions) +
	num_child * v->general_definitions.child_dev_size;

	/* portA */
	v->child0.handle = DEVICE_TYPE_EFP1;
	v->child0.device_type = DEVICE_TYPE_DP;
	v->child0.dvo_port = DVO_PORT_DPA;
	v->child0.aux_channel = DP_AUX_A;
	v->child0.dp_compat = true;
	v->child0.integrated_encoder = true;

	/* portB */
	v->child1.handle = DEVICE_TYPE_EFP2;
	v->child1.device_type = DEVICE_TYPE_DP;
	v->child1.dvo_port = DVO_PORT_DPB;
	v->child1.aux_channel = DP_AUX_B;
	v->child1.dp_compat = true;
	v->child1.integrated_encoder = true;

	/* portC */
	v->child2.handle = DEVICE_TYPE_EFP3;
	v->child2.device_type = DEVICE_TYPE_DP;
	v->child2.dvo_port = DVO_PORT_DPC;
	v->child2.aux_channel = DP_AUX_C;
	v->child2.dp_compat = true;
	v->child2.integrated_encoder = true;

	/* portD */
	v->child3.handle = DEVICE_TYPE_EFP4;
	v->child3.device_type = DEVICE_TYPE_DP;
	v->child3.dvo_port = DVO_PORT_DPD;
	v->child3.aux_channel = DP_AUX_D;
	v->child3.dp_compat = true;
	v->child3.integrated_encoder = true;

	/* driver features */
	v->driver_features_header.id = BDB_DRIVER_FEATURES;
	v->driver_features_header.size = sizeof(struct bdb_driver_features);
	v->driver_features.lvds_config = BDB_DRIVER_FEATURE_NO_LVDS;
	}

	/**
	* intel_vgpu_init_opregion - initialize the stuff used to emulate opregion
	* @vgpu: a vGPU
	*
	* Returns:
	* Zero on success, negative error code if failed.
	*/
	int intel_vgpu_init_opregion(struct intel_vgpu *vgpu)
	{
	u8 *buf;
	struct opregion_header *header;
	struct vbt v;
	const char opregion_signature[16] = OPREGION_SIGNATURE;

	gvt_dbg_core("init vgpu%d opregion\n", vgpu->id);
	vgpu_opregion(vgpu)->va = (void *)__get_free_pages(GFP_KERNEL \|
	__GFP_ZERO,
	get_order(INTEL_GVT_OPREGION_SIZE));
	if (!vgpu_opregion(vgpu)->va) {
	gvt_err("fail to get memory for vgpu virt opregion\n");
	return -ENOMEM;
	}

	/* emulated opregion with VBT mailbox only */
	buf = (u8 *)vgpu_opregion(vgpu)->va;
	header = (struct opregion_header *)buf;
	memcpy(header->signature, opregion_signature,
	sizeof(opregion_signature));
	header->size = 0x8;
	header->opregion_ver = 0x02000000;
	header->mboxes = MBOX_VBT;

	/* for unknown reason, the value in LID field is incorrect
	* which block the windows guest, so workaround it by force
	* setting it to "OPEN"
	*/
	buf[INTEL_GVT_OPREGION_CLID] = 0x3;

	/* emulated vbt from virt vbt generation */
	virt_vbt_generation(&v);
	memcpy(buf + INTEL_GVT_OPREGION_VBT_OFFSET, &v, sizeof(struct vbt));

	return 0;
	}

	static int map_vgpu_opregion(struct intel_vgpu *vgpu, bool map)
	{
	u64 mfn;
	int i, ret;

	for (i = 0; i < INTEL_GVT_OPREGION_PAGES; i++) {
	mfn = intel_gvt_hypervisor_virt_to_mfn(vgpu_opregion(vgpu)->va
	+ i * PAGE_SIZE);
	if (mfn == INTEL_GVT_INVALID_ADDR) {
	gvt_vgpu_err("fail to get MFN from VA\n");
	return -EINVAL;
	}
	ret = intel_gvt_hypervisor_map_gfn_to_mfn(vgpu,
	vgpu_opregion(vgpu)->gfn[i],
	mfn, 1, map);
	if (ret) {
	gvt_vgpu_err("fail to map GFN to MFN, errno: %d\n",
	ret);
	return ret;
	}
	}

	vgpu_opregion(vgpu)->mapped = map;

	return 0;
	}

	/**
	* intel_vgpu_opregion_base_write_handler - Opregion base register write handler
	*
	* @vgpu: a vGPU
	* @gpa: guest physical address of opregion
	*
	* Returns:
	* Zero on success, negative error code if failed.
	*/
	int intel_vgpu_opregion_base_write_handler(struct intel_vgpu *vgpu, u32 gpa)
	{

	int i, ret = 0;

	gvt_dbg_core("emulate opregion from kernel\n");

	switch (intel_gvt_host.hypervisor_type) {
	case INTEL_GVT_HYPERVISOR_KVM:
	for (i = 0; i < INTEL_GVT_OPREGION_PAGES; i++)
	vgpu_opregion(vgpu)->gfn[i] = (gpa >> PAGE_SHIFT) + i;
	break;
	case INTEL_GVT_HYPERVISOR_XEN:
	/**
	* Wins guest on Xengt will write this register twice: xen
	* hvmloader and windows graphic driver.
	*/
	if (vgpu_opregion(vgpu)->mapped)
	map_vgpu_opregion(vgpu, false);

	for (i = 0; i < INTEL_GVT_OPREGION_PAGES; i++)
	vgpu_opregion(vgpu)->gfn[i] = (gpa >> PAGE_SHIFT) + i;

	ret = map_vgpu_opregion(vgpu, true);
	break;
	default:
	ret = -EINVAL;
	gvt_vgpu_err("not supported hypervisor\n");
	}

	return ret;
	}

	/**
	* intel_vgpu_clean_opregion - clean the stuff used to emulate opregion
	* @vgpu: a vGPU
	*
	*/
	void intel_vgpu_clean_opregion(struct intel_vgpu *vgpu)
	{
	gvt_dbg_core("vgpu%d: clean vgpu opregion\n", vgpu->id);

	if (!vgpu_opregion(vgpu)->va)
	return;

	if (intel_gvt_host.hypervisor_type == INTEL_GVT_HYPERVISOR_XEN) {
	if (vgpu_opregion(vgpu)->mapped)
	map_vgpu_opregion(vgpu, false);
	} else if (intel_gvt_host.hypervisor_type == INTEL_GVT_HYPERVISOR_KVM) {
	/* Guest opregion is released by VFIO */
	}
	free_pages((unsigned long)vgpu_opregion(vgpu)->va,
	get_order(INTEL_GVT_OPREGION_SIZE));

	vgpu_opregion(vgpu)->va = NULL;

	}


	#define GVT_OPREGION_FUNC(scic) \
	({ \
	u32 __ret; \
	__ret = (scic & OPREGION_SCIC_FUNC_MASK) >> \
	OPREGION_SCIC_FUNC_SHIFT; \
	__ret; \
	})

	#define GVT_OPREGION_SUBFUNC(scic) \
	({ \
	u32 __ret; \
	__ret = (scic & OPREGION_SCIC_SUBFUNC_MASK) >> \
	OPREGION_SCIC_SUBFUNC_SHIFT; \
	__ret; \
	})

	static const char *opregion_func_name(u32 func)
	{
	const char *name = NULL;

	switch (func) {
	case 0 ... 3:
	case 5:
	case 7 ... 15:
	name = "Reserved";
	break;

	case 4:
	name = "Get BIOS Data";
	break;

	case 6:
	name = "System BIOS Callbacks";
	break;

	default:
	name = "Unknown";
	break;
	}
	return name;
	}

	static const char *opregion_subfunc_name(u32 subfunc)
	{
	const char *name = NULL;

	switch (subfunc) {
	case 0:
	name = "Supported Calls";
	break;

	case 1:
	name = "Requested Callbacks";
	break;

	case 2 ... 3:
	case 8 ... 9:
	name = "Reserved";
	break;

	case 5:
	name = "Boot Display";
	break;

	case 6:
	name = "TV-Standard/Video-Connector";
	break;

	case 7:
	name = "Internal Graphics";
	break;

	case 10:
	name = "Spread Spectrum Clocks";
	break;

	case 11:
	name = "Get AKSV";
	break;

	default:
	name = "Unknown";
	break;
	}
	return name;
	};

	static bool querying_capabilities(u32 scic)
	{
	u32 func, subfunc;

	func = GVT_OPREGION_FUNC(scic);
	subfunc = GVT_OPREGION_SUBFUNC(scic);

	if ((func == INTEL_GVT_OPREGION_SCIC_F_GETBIOSDATA &&
	subfunc == INTEL_GVT_OPREGION_SCIC_SF_SUPPRTEDCALLS)
	\|\| (func == INTEL_GVT_OPREGION_SCIC_F_GETBIOSDATA &&
	subfunc == INTEL_GVT_OPREGION_SCIC_SF_REQEUSTEDCALLBACKS)
	\|\| (func == INTEL_GVT_OPREGION_SCIC_F_GETBIOSCALLBACKS &&
	subfunc == INTEL_GVT_OPREGION_SCIC_SF_SUPPRTEDCALLS)) {
	return true;
	}
	return false;
	}

	/**
	* intel_vgpu_emulate_opregion_request - emulating OpRegion request
	* @vgpu: a vGPU
	* @swsci: SWSCI request
	*
	* Returns:
	* Zero on success, negative error code if failed
	*/
	int intel_vgpu_emulate_opregion_request(struct intel_vgpu *vgpu, u32 swsci)
	{
	u32 scic, parm;
	u32 func, subfunc;
	u64 scic_pa = 0, parm_pa = 0;
	int ret;

	switch (intel_gvt_host.hypervisor_type) {
	case INTEL_GVT_HYPERVISOR_XEN:
	scic = ((u32 )vgpu_opregion(vgpu)->va +
	INTEL_GVT_OPREGION_SCIC);
	parm = ((u32 )vgpu_opregion(vgpu)->va +
	INTEL_GVT_OPREGION_PARM);
	break;
	case INTEL_GVT_HYPERVISOR_KVM:
	scic_pa = (vgpu_opregion(vgpu)->gfn[0] << PAGE_SHIFT) +
	INTEL_GVT_OPREGION_SCIC;
	parm_pa = (vgpu_opregion(vgpu)->gfn[0] << PAGE_SHIFT) +
	INTEL_GVT_OPREGION_PARM;

	ret = intel_gvt_hypervisor_read_gpa(vgpu, scic_pa,
	&scic, sizeof(scic));
	if (ret) {
	gvt_vgpu_err("guest opregion read error %d, gpa 0x%llx, len %lu\n",
	ret, scic_pa, sizeof(scic));
	return ret;
	}

	ret = intel_gvt_hypervisor_read_gpa(vgpu, parm_pa,
	&parm, sizeof(parm));
	if (ret) {
	gvt_vgpu_err("guest opregion read error %d, gpa 0x%llx, len %lu\n",
	ret, scic_pa, sizeof(scic));
	return ret;
	}

	break;
	default:
	gvt_vgpu_err("not supported hypervisor\n");
	return -EINVAL;
	}

	if (!(swsci & SWSCI_SCI_SELECT)) {
	gvt_vgpu_err("requesting SMI service\n");
	return 0;
	}
	/* ignore non 0->1 trasitions */
	if ((vgpu_cfg_space(vgpu)[INTEL_GVT_PCI_SWSCI]
	& SWSCI_SCI_TRIGGER) \|\|
	!(swsci & SWSCI_SCI_TRIGGER)) {
	return 0;
	}

	func = GVT_OPREGION_FUNC(scic);
	subfunc = GVT_OPREGION_SUBFUNC(scic);
	if (!querying_capabilities(scic)) {
	gvt_vgpu_err("requesting runtime service: func \"%s\","
	" subfunc \"%s\"\n",
	opregion_func_name(func),
	opregion_subfunc_name(subfunc));
	/*
	* emulate exit status of function call, '0' means
	* "failure, generic, unsupported or unknown cause"
	*/
	scic &= ~OPREGION_SCIC_EXIT_MASK;
	goto out;
	}

	scic = 0;
	parm = 0;

	out:
	switch (intel_gvt_host.hypervisor_type) {
	case INTEL_GVT_HYPERVISOR_XEN:
	((u32 )vgpu_opregion(vgpu)->va +
	INTEL_GVT_OPREGION_SCIC) = scic;
	((u32 )vgpu_opregion(vgpu)->va +
	INTEL_GVT_OPREGION_PARM) = parm;
	break;
	case INTEL_GVT_HYPERVISOR_KVM:
	ret = intel_gvt_hypervisor_write_gpa(vgpu, scic_pa,
	&scic, sizeof(scic));
	if (ret) {
	gvt_vgpu_err("guest opregion write error %d, gpa 0x%llx, len %lu\n",
	ret, scic_pa, sizeof(scic));
	return ret;
	}

	ret = intel_gvt_hypervisor_write_gpa(vgpu, parm_pa,
	&parm, sizeof(parm));
	if (ret) {
	gvt_vgpu_err("guest opregion write error %d, gpa 0x%llx, len %lu\n",
	ret, scic_pa, sizeof(scic));
	return ret;
	}

	break;
	default:
	gvt_vgpu_err("not supported hypervisor\n");
	return -EINVAL;
	}

	return 0;
	}