Commit e111dabe authored by fangbaoshun's avatar fangbaoshun Committed by hanliyang
Browse files

drm/hygon: Add support to passthrough Hygon DCU to virtual machine 

hygon inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I98WRI


CVE: NA

---------------------------

PCI RESET will cause failure to passthrough Hygon DCU to the guest. Fix
this issue by add hydcu-fixup-header driver to disable PCI RESET.

Signed-off-by: default avatarfangbaoshun <fangbaoshun@hygon.cn>
Signed-off-by: default avatarhanliyang <hanliyang@hygon.cn>
parent 10bfbd53

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.

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
 
 No newline at end of file

drivers/gpu/drm/hygon/hydcu-fixup-header/hydcu_pci_fixup_header.c

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

/*

 * HYGON DCU fixup driver

 *

 * Copyright (C) 2024 Hygon Info Technologies Ltd.

 *

 * Author: Baoshun Fang <baoshunfang@hygon.cn>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt



#include <linux/device.h>

#include <linux/file.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/delay.h>



#define PCI_VENDOR_ID_HYGON 0x1d94



#define DEVICE_Z100SM		0x51b7

#define DEVICE_C878182		0x52b7

#define DEVICE_C878186		0x53b7

#define DEVICE_Z100		0x54b7

#define DEVICE_Z100L		0x55b7

#define DEVICE_C878181		0x56b7

#define DEVICE_C878185		0x57b7

#define DEVICE_C878188		0x58b7

#define DEVICE_C878174		0x59b7

#define DEVICE_KONGMING		0x61b7

#define DEVICE_KONGMING_E	0x6210



#define DRIVER_VERSION  "0.2"

#define DRIVER_AUTHOR   "huangjun <huangjun@hygon.cn>"

#define DRIVER_DESC     "fix dcu header"



static int hydcu_pci_fixup_header_probe(struct pci_dev *pdev, const struct pci_device_id *id)

{

	dev_info(&pdev->dev, "add flags NO_BUS_RESET\n");

	pdev->dev_flags |= PCI_DEV_FLAGS_NO_BUS_RESET;

	pdev->pm_cap = 0;

	dev_info(&pdev->dev, "will abort probe\n");



	return -EINVAL;

}



static void hydcu_pci_fixup_header_remove(struct pci_dev *pdev)

{

}



static const struct pci_device_id hydcu_pci_fixup_header_ids[] = {

	{ PCI_VDEVICE(HYGON, DEVICE_Z100SM), },

	{ PCI_VDEVICE(HYGON, DEVICE_C878182), },

	{ PCI_VDEVICE(HYGON, DEVICE_C878186), },

	{ PCI_VDEVICE(HYGON, DEVICE_Z100), },

	{ PCI_VDEVICE(HYGON, DEVICE_Z100L), },

	{ PCI_VDEVICE(HYGON, DEVICE_C878181), },

	{ PCI_VDEVICE(HYGON, DEVICE_C878185), },

	{ PCI_VDEVICE(HYGON, DEVICE_C878188), },

	{ PCI_VDEVICE(HYGON, DEVICE_C878174), },

	{ PCI_VDEVICE(HYGON, DEVICE_KONGMING), },

	{ PCI_VDEVICE(HYGON, DEVICE_KONGMING_E), },

	{},

};



static struct pci_driver hydcu_pci_fixup_header_driver = {

	.name		= "hydcu-fixup-header",

	.id_table	= hydcu_pci_fixup_header_ids,

	.probe		= hydcu_pci_fixup_header_probe,

	.remove		= hydcu_pci_fixup_header_remove,

};



static int __init hydcu_pci_fixup_header_init(void)

{

	/* Register and scan for devices */

	return pci_register_driver(&hydcu_pci_fixup_header_driver);

}



static void __exit hydcu_pci_fixup_header_cleanup(void)

{

	pci_unregister_driver(&hydcu_pci_fixup_header_driver);

}



module_init(hydcu_pci_fixup_header_init);

module_exit(hydcu_pci_fixup_header_cleanup);



MODULE_VERSION(DRIVER_VERSION);

MODULE_LICENSE("GPL");

MODULE_AUTHOR(DRIVER_AUTHOR);

MODULE_DESCRIPTION(DRIVER_DESC);