From a548dc00536e2cc6e7e7f95487f5261b3133a0d7 Mon Sep 17 00:00:00 2001 From: Diana Craciun Date: Wed, 18 Sep 2019 18:26:14 +0300 Subject: [PATCH] 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 Signed-off-by: Diana Craciun --- drivers/vfio/fsl-mc/vfio_fsl_mc.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) --- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c @@ -32,10 +32,30 @@ static void vfio_fsl_mc_release(void *de 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 -EINVAL; + 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: {