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: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -7469,6 +7469,7 @@ F: drivers/hid/hid-hyperv.c
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F: drivers/hv/
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F: drivers/input/serio/hyperv-keyboard.c
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F: drivers/pci/controller/pci-hyperv.c
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F: drivers/pci/controller/pci-hyperv-intf.c
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F: drivers/net/hyperv/
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F: drivers/scsi/storvsc_drv.c
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F: drivers/uio/uio_hv_generic.c
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@ -182,6 +182,7 @@ config PCI_LABEL
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config PCI_HYPERV
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tristate "Hyper-V PCI Frontend"
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depends on X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64
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select PCI_HYPERV_INTERFACE
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help
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The PCI device frontend driver allows the kernel to import arbitrary
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PCI devices from a PCI backend to support PCI driver domains.
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@ -281,5 +281,12 @@ config VMD
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To compile this driver as a module, choose M here: the
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module will be called vmd.
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config PCI_HYPERV_INTERFACE
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tristate "Hyper-V PCI Interface"
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depends on X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64
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help
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The Hyper-V PCI Interface is a helper driver allows other drivers to
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have a common interface with the Hyper-V PCI frontend driver.
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source "drivers/pci/controller/dwc/Kconfig"
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endmenu
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@ -4,6 +4,7 @@ obj-$(CONFIG_PCIE_CADENCE_HOST) += pcie-cadence-host.o
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obj-$(CONFIG_PCIE_CADENCE_EP) += pcie-cadence-ep.o
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obj-$(CONFIG_PCI_FTPCI100) += pci-ftpci100.o
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obj-$(CONFIG_PCI_HYPERV) += pci-hyperv.o
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obj-$(CONFIG_PCI_HYPERV_INTERFACE) += pci-hyperv-intf.o
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obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
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obj-$(CONFIG_PCI_AARDVARK) += pci-aardvark.o
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obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
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@ -0,0 +1,67 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) Microsoft Corporation.
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*
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* Author:
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* Haiyang Zhang <haiyangz@microsoft.com>
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*
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* This small module is a helper driver allows other drivers to
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* have a common interface with the Hyper-V PCI frontend driver.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/hyperv.h>
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struct hyperv_pci_block_ops hvpci_block_ops;
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EXPORT_SYMBOL_GPL(hvpci_block_ops);
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int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len,
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unsigned int block_id, unsigned int *bytes_returned)
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{
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if (!hvpci_block_ops.read_block)
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return -EOPNOTSUPP;
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return hvpci_block_ops.read_block(dev, buf, buf_len, block_id,
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bytes_returned);
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}
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EXPORT_SYMBOL_GPL(hyperv_read_cfg_blk);
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int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len,
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unsigned int block_id)
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{
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if (!hvpci_block_ops.write_block)
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return -EOPNOTSUPP;
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return hvpci_block_ops.write_block(dev, buf, len, block_id);
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}
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EXPORT_SYMBOL_GPL(hyperv_write_cfg_blk);
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int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context,
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void (*block_invalidate)(void *context,
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u64 block_mask))
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{
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if (!hvpci_block_ops.reg_blk_invalidate)
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return -EOPNOTSUPP;
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return hvpci_block_ops.reg_blk_invalidate(dev, context,
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block_invalidate);
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}
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EXPORT_SYMBOL_GPL(hyperv_reg_block_invalidate);
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static void __exit exit_hv_pci_intf(void)
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{
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}
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static int __init init_hv_pci_intf(void)
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{
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return 0;
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}
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module_init(init_hv_pci_intf);
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module_exit(exit_hv_pci_intf);
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MODULE_DESCRIPTION("Hyper-V PCI Interface");
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MODULE_LICENSE("GPL v2");
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@ -983,7 +983,6 @@ int hv_read_config_block(struct pci_dev *pdev, void *buf, unsigned int len,
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*bytes_returned = comp_pkt.bytes_returned;
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return 0;
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}
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EXPORT_SYMBOL(hv_read_config_block);
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/**
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* hv_pci_write_config_compl() - Invoked when a response packet for a write
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@ -1070,7 +1069,6 @@ int hv_write_config_block(struct pci_dev *pdev, void *buf, unsigned int len,
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return 0;
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}
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EXPORT_SYMBOL(hv_write_config_block);
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/**
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* hv_register_block_invalidate() - Invoked when a config block invalidation
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@ -1101,7 +1099,6 @@ int hv_register_block_invalidate(struct pci_dev *pdev, void *context,
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return 0;
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}
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EXPORT_SYMBOL(hv_register_block_invalidate);
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/* Interrupt management hooks */
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static void hv_int_desc_free(struct hv_pci_dev *hpdev,
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@ -3045,10 +3042,19 @@ static struct hv_driver hv_pci_drv = {
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static void __exit exit_hv_pci_drv(void)
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{
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vmbus_driver_unregister(&hv_pci_drv);
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hvpci_block_ops.read_block = NULL;
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hvpci_block_ops.write_block = NULL;
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hvpci_block_ops.reg_blk_invalidate = NULL;
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}
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static int __init init_hv_pci_drv(void)
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{
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/* Initialize PCI block r/w interface */
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hvpci_block_ops.read_block = hv_read_config_block;
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hvpci_block_ops.write_block = hv_write_config_block;
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hvpci_block_ops.reg_blk_invalidate = hv_register_block_invalidate;
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return vmbus_driver_register(&hv_pci_drv);
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}
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@ -1579,18 +1579,32 @@ hv_pkt_iter_next(struct vmbus_channel *channel,
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pkt = hv_pkt_iter_next(channel, pkt))
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/*
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* Functions for passing data between SR-IOV PF and VF drivers. The VF driver
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* Interface for passing data between SR-IOV PF and VF drivers. The VF driver
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* sends requests to read and write blocks. Each block must be 128 bytes or
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* smaller. Optionally, the VF driver can register a callback function which
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* will be invoked when the host says that one or more of the first 64 block
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* IDs is "invalid" which means that the VF driver should reread them.
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*/
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#define HV_CONFIG_BLOCK_SIZE_MAX 128
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int hv_read_config_block(struct pci_dev *dev, void *buf, unsigned int buf_len,
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unsigned int block_id, unsigned int *bytes_returned);
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int hv_write_config_block(struct pci_dev *dev, void *buf, unsigned int len,
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unsigned int block_id);
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int hv_register_block_invalidate(struct pci_dev *dev, void *context,
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void (*block_invalidate)(void *context,
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u64 block_mask));
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int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len,
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unsigned int block_id, unsigned int *bytes_returned);
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int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len,
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unsigned int block_id);
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int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context,
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void (*block_invalidate)(void *context,
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u64 block_mask));
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struct hyperv_pci_block_ops {
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int (*read_block)(struct pci_dev *dev, void *buf, unsigned int buf_len,
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unsigned int block_id, unsigned int *bytes_returned);
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int (*write_block)(struct pci_dev *dev, void *buf, unsigned int len,
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unsigned int block_id);
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int (*reg_blk_invalidate)(struct pci_dev *dev, void *context,
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void (*block_invalidate)(void *context,
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u64 block_mask));
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};
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extern struct hyperv_pci_block_ops hvpci_block_ops;
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#endif /* _HYPERV_H */
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