drm/i915/gvt: opregion virtualization for win guest

this is an enhanced opregion emulation for win guest support
by initializing more data members including opregion header
size, version and child device propertity for display port.
for simplicity, redefined child_device_config structure.
Signed-off-by: Xiaolin Zhang <xiaolin.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drivers/gpu/drm/i915/gvt/opregion.c

@@ -63,6 +63,60 @@ struct bdb_data_header {
 	u16 size; /* data size */
 } __packed;
 
+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;
+	u8 dp_usb_type_c:1; /* 195 */
+	u8 skip6:7;
+	u8 dp_usb_type_c_2x_gpio_index; /* 195 */
+	u16 dp_usb_type_c_2x_gpio_pin; /* 195 */
+	u8 iboost_dp:4; /* 196 */
+	u8 iboost_hdmi:4; /* 196 */
+} __packed;
+
 struct vbt {
 	/* header->bdb_offset point to bdb_header offset */
 	struct vbt_header header;
@@ -73,10 +127,11 @@ struct vbt {
 
 	struct bdb_data_header general_definitions_header;
 	struct bdb_general_definitions general_definitions;
-	struct child_device_config child0;
-	struct child_device_config child1;
-	struct child_device_config child2;
-	struct child_device_config child3;
+
+	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;
@@ -100,7 +155,7 @@ static void virt_vbt_generation(struct vbt *v)
 	v->header.bdb_offset = offsetof(struct vbt, bdb_header);
 
 	strcpy(&v->bdb_header.signature[0], "BIOS_DATA_BLOCK");
-	v->bdb_header.version = 198; /* child_dev_size = 38 */
+	v->bdb_header.version = 186; /* child_dev_size = 38 */
 	v->bdb_header.header_size = sizeof(v->bdb_header);
 
 	v->bdb_header.bdb_size = sizeof(struct vbt) - sizeof(struct vbt_header)
@@ -125,24 +180,32 @@ static void virt_vbt_generation(struct vbt *v)
 	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;
@@ -278,22 +341,23 @@ int intel_gvt_init_opregion(struct intel_gvt *gvt)
 	}
 
 	/* emulated opregion with VBT mailbox only */
-	header = (struct opregion_header *)gvt->opregion.opregion_va;
+	buf = (u8 *)gvt->opregion.opregion_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 = (u8 *)gvt->opregion.opregion_va;
 	buf[INTEL_GVT_OPREGION_CLID] = 0x3;
 
 	/* emulated vbt from virt vbt generation */
 	virt_vbt_generation(&v);
-	memcpy(gvt->opregion.opregion_va + INTEL_GVT_OPREGION_VBT_OFFSET,
-			&v, sizeof(struct vbt));
+	memcpy(buf + INTEL_GVT_OPREGION_VBT_OFFSET, &v, sizeof(struct vbt));
 
 	return 0;
 }