Re: [Qemu-devel] [RFC PATCH v4 1/3] Mediated device Core driver

[Dong Jia <bjsdjshi@linux.vnet.ibm.com>]

On Wed, 25 May 2016 01:28:15 +0530
Kirti Wankhede <kwankhede@nvidia.com> wrote:


...snip...

> +struct phy_device_ops {
> +	struct module   *owner;
> +	const struct attribute_group **dev_attr_groups;
> +	const struct attribute_group **mdev_attr_groups;
> +
> +	int	(*supported_config)(struct device *dev, char *config);
> +	int     (*create)(struct device *dev, uuid_le uuid,
> +			  uint32_t instance, char *mdev_params);
> +	int     (*destroy)(struct device *dev, uuid_le uuid,
> +			   uint32_t instance);
> +	int     (*start)(uuid_le uuid);
> +	int     (*shutdown)(uuid_le uuid);
> +	ssize_t (*read)(struct mdev_device *vdev, char *buf, size_t count,
> +			enum mdev_emul_space address_space, loff_t pos);
> +	ssize_t (*write)(struct mdev_device *vdev, char *buf, size_t count,
> +			 enum mdev_emul_space address_space, loff_t pos);
> +	int     (*set_irqs)(struct mdev_device *vdev, uint32_t flags,
> +			    unsigned int index, unsigned int start,
> +			    unsigned int count, void *data);
> +	int	(*get_region_info)(struct mdev_device *vdev, int region_index,
> +				 struct pci_region_info *region_info);
> +	int	(*validate_map_request)(struct mdev_device *vdev,
> +					unsigned long virtaddr,
> +					unsigned long *pfn, unsigned long *size,
> +					pgprot_t *prot);
> +};

Dear Kirti:

When I rebased my vfio-ccw patches on this series, I found I need an
extra 'ioctl' callback in phy_device_ops.

The ccw physical device only supports one ccw mediated device. And I
have two new ioctl commands for the ccw mediated device. One is 
to hot-reset the resource in the physical device that allocated for
the mediated device, the other is to do an I/O instruction translation
and perform an I/O operation on the physical device. I found the
existing callbacks could not meet my requirements.

Something like the following would be fine for my case:
	int (*ioctl)(struct mdev_device *vdev,
		     unsigned int cmd,
		     unsigned long arg);

What do you think about this?

--------
Dong Jia