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

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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>
This commit is contained in:
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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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 */