PCI: hv: Add a Hyper-V PCI interface driver for software backchannel interface (348dd93e) · Commits · 戴 / test

MAINTAINERS

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		@@ -7469,6 +7469,7 @@ F: drivers/hid/hid-hyperv.c
		F: drivers/hv/
		F: drivers/input/serio/hyperv-keyboard.c
		F: drivers/pci/controller/pci-hyperv.c
		F: drivers/pci/controller/pci-hyperv-intf.c
		F: drivers/net/hyperv/
		F: drivers/scsi/storvsc_drv.c
		F: drivers/uio/uio_hv_generic.c

drivers/pci/Kconfig

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		@@ -182,6 +182,7 @@ config PCI_LABEL
		config PCI_HYPERV
		tristate "Hyper-V PCI Frontend"
		depends on X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64
		select PCI_HYPERV_INTERFACE
		help
		The PCI device frontend driver allows the kernel to import arbitrary
		PCI devices from a PCI backend to support PCI driver domains.

drivers/pci/controller/Kconfig

+7 −0

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		@@ -281,5 +281,12 @@ config VMD
		To compile this driver as a module, choose M here: the
		module will be called vmd.

		config PCI_HYPERV_INTERFACE
		tristate "Hyper-V PCI Interface"
		depends on X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64
		help
		The Hyper-V PCI Interface is a helper driver allows other drivers to
		have a common interface with the Hyper-V PCI frontend driver.

		source "drivers/pci/controller/dwc/Kconfig"
		endmenu

drivers/pci/controller/Makefile

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		@@ -4,6 +4,7 @@ obj-$(CONFIG_PCIE_CADENCE_HOST) += pcie-cadence-host.o
		obj-$(CONFIG_PCIE_CADENCE_EP) += pcie-cadence-ep.o
		obj-$(CONFIG_PCI_FTPCI100) += pci-ftpci100.o
		obj-$(CONFIG_PCI_HYPERV) += pci-hyperv.o
		obj-$(CONFIG_PCI_HYPERV_INTERFACE) += pci-hyperv-intf.o
		obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
		obj-$(CONFIG_PCI_AARDVARK) += pci-aardvark.o
		obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o

drivers/pci/controller/pci-hyperv-intf.c

0 → 100644

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		// SPDX-License-Identifier: GPL-2.0
		/*
		* Copyright (c) Microsoft Corporation.
		*
		* Author:
		* Haiyang Zhang <haiyangz@microsoft.com>
		*
		* This small module is a helper driver allows other drivers to
		* have a common interface with the Hyper-V PCI frontend driver.
		*/

		#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/hyperv.h>

		struct hyperv_pci_block_ops hvpci_block_ops;
		EXPORT_SYMBOL_GPL(hvpci_block_ops);

		int hyperv_read_cfg_blk(struct pci_dev dev, void buf, unsigned int buf_len,
		unsigned int block_id, unsigned int *bytes_returned)
		{
		if (!hvpci_block_ops.read_block)
		return -EOPNOTSUPP;

		return hvpci_block_ops.read_block(dev, buf, buf_len, block_id,
		bytes_returned);
		}
		EXPORT_SYMBOL_GPL(hyperv_read_cfg_blk);

		int hyperv_write_cfg_blk(struct pci_dev dev, void buf, unsigned int len,
		unsigned int block_id)
		{
		if (!hvpci_block_ops.write_block)
		return -EOPNOTSUPP;

		return hvpci_block_ops.write_block(dev, buf, len, block_id);
		}
		EXPORT_SYMBOL_GPL(hyperv_write_cfg_blk);

		int hyperv_reg_block_invalidate(struct pci_dev dev, void context,
		void (block_invalidate)(void context,
		u64 block_mask))
		{
		if (!hvpci_block_ops.reg_blk_invalidate)
		return -EOPNOTSUPP;

		return hvpci_block_ops.reg_blk_invalidate(dev, context,
		block_invalidate);
		}
		EXPORT_SYMBOL_GPL(hyperv_reg_block_invalidate);

		static void __exit exit_hv_pci_intf(void)
		{
		}

		static int __init init_hv_pci_intf(void)
		{
		return 0;
		}

		module_init(init_hv_pci_intf);
		module_exit(exit_hv_pci_intf);

		MODULE_DESCRIPTION("Hyper-V PCI Interface");
		MODULE_LICENSE("GPL v2");

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