Commit 348dd93e authored by Haiyang Zhang's avatar Haiyang Zhang Committed by David S. Miller
Browse files

PCI: hv: Add a Hyper-V PCI interface driver for software backchannel interface 



This interface driver is a helper driver allows other drivers to
have a common interface with the Hyper-V PCI frontend driver.

Signed-off-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: default avatarSaeed Mahameed <saeedm@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e5d2f910

MAINTAINERS

+1 −0
Original line number Diff line number Diff line
@@ -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

+1 −0
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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
Original line number Diff line number Diff line
@@ -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

+1 −0
Original line number Diff line number Diff line
@@ -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
+67 −0
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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");