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Commit e01bcdd6 authored by Dong Jia Shi's avatar Dong Jia Shi Committed by Cornelia Huck
Browse files

vfio: ccw: realize VFIO_DEVICE_GET_REGION_INFO ioctl 



Introduce device information about vfio-ccw: VFIO_DEVICE_FLAGS_CCW.
Realize VFIO_DEVICE_GET_REGION_INFO ioctl for vfio-ccw.

Reviewed-by: default avatarPierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: default avatarDong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Acked-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Message-Id: <20170317031743.40128-10-bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
parent 4e149e43

drivers/s390/cio/vfio_ccw_ops.c

+78 −0
Original line number Diff line number Diff line
@@ -188,6 +188,83 @@ static ssize_t vfio_ccw_mdev_write(struct mdev_device *mdev, 
	return count;

}



static int vfio_ccw_mdev_get_device_info(struct vfio_device_info *info)

{

	info->flags = VFIO_DEVICE_FLAGS_CCW;

	info->num_regions = VFIO_CCW_NUM_REGIONS;

	info->num_irqs = 0;



	return 0;

}



static int vfio_ccw_mdev_get_region_info(struct vfio_region_info *info,

					 u16 *cap_type_id,

					 void **cap_type)

{

	switch (info->index) {

	case VFIO_CCW_CONFIG_REGION_INDEX:

		info->offset = 0;

		info->size = sizeof(struct ccw_io_region);

		info->flags = VFIO_REGION_INFO_FLAG_READ

			      | VFIO_REGION_INFO_FLAG_WRITE;

		return 0;

	default:

		return -EINVAL;

	}

}



static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev,

				   unsigned int cmd,

				   unsigned long arg)

{

	int ret = 0;

	unsigned long minsz;



	switch (cmd) {

	case VFIO_DEVICE_GET_INFO:

	{

		struct vfio_device_info info;



		minsz = offsetofend(struct vfio_device_info, num_irqs);



		if (copy_from_user(&info, (void __user *)arg, minsz))

			return -EFAULT;



		if (info.argsz < minsz)

			return -EINVAL;



		ret = vfio_ccw_mdev_get_device_info(&info);

		if (ret)

			return ret;



		return copy_to_user((void __user *)arg, &info, minsz);

	}

	case VFIO_DEVICE_GET_REGION_INFO:

	{

		struct vfio_region_info info;

		u16 cap_type_id = 0;

		void *cap_type = NULL;



		minsz = offsetofend(struct vfio_region_info, offset);



		if (copy_from_user(&info, (void __user *)arg, minsz))

			return -EFAULT;



		if (info.argsz < minsz)

			return -EINVAL;



		ret = vfio_ccw_mdev_get_region_info(&info, &cap_type_id,

						    &cap_type);

		if (ret)

			return ret;



		return copy_to_user((void __user *)arg, &info, minsz);

	}

	default:

		return -ENOTTY;

	}

}



static const struct mdev_parent_ops vfio_ccw_mdev_ops = {

	.owner			= THIS_MODULE,

	.supported_type_groups  = mdev_type_groups,
@@ -197,6 +274,7 @@ static const struct mdev_parent_ops vfio_ccw_mdev_ops = { 
	.release		= vfio_ccw_mdev_release,

	.read			= vfio_ccw_mdev_read,

	.write			= vfio_ccw_mdev_write,

	.ioctl			= vfio_ccw_mdev_ioctl,

};



int vfio_ccw_mdev_reg(struct subchannel *sch)

include/uapi/linux/vfio.h

+11 −0
Original line number Diff line number Diff line
@@ -198,6 +198,7 @@ struct vfio_device_info { 
#define VFIO_DEVICE_FLAGS_PCI	(1 << 1)	/* vfio-pci device */

#define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2)	/* vfio-platform device */

#define VFIO_DEVICE_FLAGS_AMBA  (1 << 3)	/* vfio-amba device */

#define VFIO_DEVICE_FLAGS_CCW	(1 << 4)	/* vfio-ccw device */

	__u32	num_regions;	/* Max region index + 1 */

	__u32	num_irqs;	/* Max IRQ index + 1 */

};
@@ -447,6 +448,16 @@ enum { 
	VFIO_PCI_NUM_IRQS

};



/*

 * The vfio-ccw bus driver makes use of the following fixed region.

 * Unimplemented regions return a size of zero.

 */



enum {

	VFIO_CCW_CONFIG_REGION_INDEX,

	VFIO_CCW_NUM_REGIONS

};



/**

 * VFIO_DEVICE_GET_PCI_HOT_RESET_INFO - _IORW(VFIO_TYPE, VFIO_BASE + 12,

 *					      struct vfio_pci_hot_reset_info)