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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>
alistair/sunxi64-5.4-dsi
Haiyang Zhang 2019-08-22 05:05:41 +00:00 committed by David S. Miller
parent e5d2f910cf
commit 348dd93e40
7 changed files with 108 additions and 11 deletions
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1
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

1
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.

7
drivers/pci/controller/Kconfig
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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

1
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

67
drivers/pci/controller/pci-hyperv-intf.c 100644
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@ -0,0 +1,67 @@
// 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");

12
drivers/pci/controller/pci-hyperv.c
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@ -983,7 +983,6 @@ int hv_read_config_block(struct pci_dev *pdev, void *buf, unsigned int len,
*bytes_returned = comp_pkt.bytes_returned;
return 0;
}
EXPORT_SYMBOL(hv_read_config_block);
/**
* hv_pci_write_config_compl() - Invoked when a response packet for a write
@ -1070,7 +1069,6 @@ int hv_write_config_block(struct pci_dev *pdev, void *buf, unsigned int len,
return 0;
}
EXPORT_SYMBOL(hv_write_config_block);
/**
* hv_register_block_invalidate() - Invoked when a config block invalidation
@ -1101,7 +1099,6 @@ int hv_register_block_invalidate(struct pci_dev *pdev, void *context,
return 0;
}
EXPORT_SYMBOL(hv_register_block_invalidate);
/* Interrupt management hooks */
static void hv_int_desc_free(struct hv_pci_dev *hpdev,
@ -3045,10 +3042,19 @@ static struct hv_driver hv_pci_drv = {
static void __exit exit_hv_pci_drv(void)
{
vmbus_driver_unregister(&hv_pci_drv);
hvpci_block_ops.read_block = NULL;
hvpci_block_ops.write_block = NULL;
hvpci_block_ops.reg_blk_invalidate = NULL;
}
static int __init init_hv_pci_drv(void)
{
/* Initialize PCI block r/w interface */
hvpci_block_ops.read_block = hv_read_config_block;
hvpci_block_ops.write_block = hv_write_config_block;
hvpci_block_ops.reg_blk_invalidate = hv_register_block_invalidate;
return vmbus_driver_register(&hv_pci_drv);
}

30
include/linux/hyperv.h
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@ -1579,18 +1579,32 @@ hv_pkt_iter_next(struct vmbus_channel *channel,
pkt = hv_pkt_iter_next(channel, pkt))
/*
* Functions for passing data between SR-IOV PF and VF drivers. The VF driver
* Interface for passing data between SR-IOV PF and VF drivers. The VF driver
* sends requests to read and write blocks. Each block must be 128 bytes or
* smaller. Optionally, the VF driver can register a callback function which
* will be invoked when the host says that one or more of the first 64 block
* IDs is "invalid" which means that the VF driver should reread them.
*/
#define HV_CONFIG_BLOCK_SIZE_MAX 128
int hv_read_config_block(struct pci_dev *dev, void *buf, unsigned int buf_len,
unsigned int block_id, unsigned int *bytes_returned);
int hv_write_config_block(struct pci_dev *dev, void *buf, unsigned int len,
unsigned int block_id);
int hv_register_block_invalidate(struct pci_dev *dev, void *context,
void (*block_invalidate)(void *context,
u64 block_mask));
int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len,
unsigned int block_id, unsigned int *bytes_returned);
int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len,
unsigned int block_id);
int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context,
void (*block_invalidate)(void *context,
u64 block_mask));
struct hyperv_pci_block_ops {
int (*read_block)(struct pci_dev *dev, void *buf, unsigned int buf_len,
unsigned int block_id, unsigned int *bytes_returned);
int (*write_block)(struct pci_dev *dev, void *buf, unsigned int len,
unsigned int block_id);
int (*reg_blk_invalidate)(struct pci_dev *dev, void *context,
void (*block_invalidate)(void *context,
u64 block_mask));
};
extern struct hyperv_pci_block_ops hvpci_block_ops;
#endif /* _HYPERV_H */