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vfio/fsl-mc: Implement VFIO_DEVICE_GET_INFO ioctl 

Allow userspace to get fsl-mc device info (number of regions
and irqs).

Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
Signed-off-by: Diana Craciun <diana.craciun@oss.nxp.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Diana Craciun 2020-10-05 20:36:47 +03:00 committed by Alex Williamson
parent 704f5082d8
commit f97f4c04e5
1 changed files with 20 additions and 1 deletions
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21
drivers/vfio/fsl-mc/vfio_fsl_mc.c
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@ -33,10 +33,29 @@ static void vfio_fsl_mc_release(void *device_data)
static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
unsigned long arg)
{
unsigned long minsz;
struct vfio_fsl_mc_device *vdev = device_data;
struct fsl_mc_device *mc_dev = vdev->mc_dev;
switch (cmd) {
case VFIO_DEVICE_GET_INFO:
{
return -ENOTTY;
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;
info.flags = VFIO_DEVICE_FLAGS_FSL_MC;
info.num_regions = mc_dev->obj_desc.region_count;
info.num_irqs = mc_dev->obj_desc.irq_count;
return copy_to_user((void __user *)arg, &info, minsz) ?
-EFAULT : 0;
}
case VFIO_DEVICE_GET_REGION_INFO:
{