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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: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Message-Id: <20170317031743.40128-10-bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Dong Jia Shi 2017-03-17 04:17:36 +01:00 committed by Cornelia Huck
parent 4e149e431a
commit e01bcdd613
2 changed files with 89 additions and 0 deletions
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78
drivers/s390/cio/vfio_ccw_ops.c
View File

@ -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)

11
include/uapi/linux/vfio.h
View File

@ -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)