!151 [next-6.6]Hygon: Support passthru DCU to virtual machine

Merge pull request !151 from hanliyang/next_hydcu

Documentation/gpu/hydcu-fixup-header.rst

@@ -0,0 +1,13 @@
+.. 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

@@ -438,3 +438,9 @@ config DRM_LIB_RANDOM
 config DRM_PRIVACY_SCREEN
 	bool
 	default n
+
+config HYDCU_FIXUP_HEADER
+	bool "Enable fixup header support for HYDCU"
+	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

@@ -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

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+obj-$(CONFIG_HYDCU_FIXUP_HEADER) += hydcu_pci_fixup_header.o

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

@@ -0,0 +1,93 @@
+// 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);