Unverified Commit be0a5121 authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
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!5262 [OLK-6.6]HYGON: Support Hygon DCU passthrough to VMs 

Merge Pull Request from: @hanliyang 
 
Support Hygon DCU passthrough to VMs

issue:
https://gitee.com/open_euler/dashboard?issue_id=I98WRI

Hygon DCU doesn't support to control to reset. When using the vfio-pci driver for PCI device passthru, the vfio-pci driver code will initialize the device, including the reset device process, but if the passthru device is a Hygon DCU, the VMM will not work properly. In order to solve this problem, the hydcu-fixup-header driver is introduced, the PCI_DEV_FLAGS_NO_BUS_RESET flag will be set to the Hygon DCU to indicate that the device is not resettable. 
 
Link:https://gitee.com/openeuler/kernel/pulls/5262

 

Reviewed-by: default avatarLiu Chao <liuchao173@huawei.com>
Signed-off-by: default avatarZhang Peng <zhangpeng362@huawei.com>
parents d7f142ee bafe7735

Documentation/gpu/hydcu-fixup-header.rst

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.. SPDX-License-Identifier: GPL-2.0-only



=========================

 drm/hygon/hydcu-fixup-header hydcu-fixup-header driver

=========================



The  drm/hygon/hydcu-fixup-header driver supports all HYGON DCUs.



General description

======================



The drm/hygon/hydcu-fixup-header driver adds flags NO_BUS_RESET to hydcu

device to disable vfio pci reset, as dcu is not support now.

arch/x86/configs/openeuler_defconfig

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@@ -5666,6 +5666,7 @@ CONFIG_DRM_CIRRUS_QEMU=m 
# CONFIG_DRM_LEGACY is not set

CONFIG_DRM_PANEL_ORIENTATION_QUIRKS=y

CONFIG_DRM_PRIVACY_SCREEN=y

CONFIG_HYDCU_FIXUP_HEADER=y



#

# Frame buffer Devices

drivers/gpu/drm/Kconfig

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@@ -438,3 +438,11 @@ config DRM_LIB_RANDOM 
config DRM_PRIVACY_SCREEN

	bool

	default n



config HYDCU_FIXUP_HEADER

	tristate "Enable fixup header support for HYDCU"

	default y

	depends on X86_64

	help

	  Choose this option if you want to use pci passthrough with HYDCU

	  HYDCU cannot support pci reset, so enable this module to disable pci reset

drivers/gpu/drm/Makefile

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@@ -199,3 +199,4 @@ obj-y += solomon/ 
obj-$(CONFIG_DRM_SPRD) += sprd/

obj-$(CONFIG_DRM_LOONGSON) += loongson/

obj-$(CONFIG_DRM_PHYTIUM) += phytium/

obj-$(CONFIG_HYDCU_FIXUP_HEADER) += hygon/hydcu-fixup-header/

drivers/gpu/drm/hygon/hydcu-fixup-header/Makefile

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# SPDX-License-Identifier: GPL-2.0-only



obj-$(CONFIG_HYDCU_FIXUP_HEADER) += hydcu_pci_fixup_header.o
 
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