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authorDiana Craciun <diana.craciun@oss.nxp.com>2020-10-05 20:36:47 +0300
committerAlex Williamson <alex.williamson@redhat.com>2020-10-12 20:32:19 +0300
commitf97f4c04e5d6ca8b90b5b412bd7e72de79426263 (patch)
tree748e6ba9a6705d8d8dd06b36d02a3073ee572789 /drivers/vfio
parent704f5082d8457a2166eb4cb4e460510117c70928 (diff)
downloadlinux-f97f4c04e5d6ca8b90b5b412bd7e72de79426263.tar.xz
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>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/fsl-mc/vfio_fsl_mc.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
index 594760203268..161c2cbe07dc 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -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:
{