From: Diana Craciun <diana.craciun@oss.nxp.com>
Date: Mon, 5 Oct 2020 17:36:47 +0000 (+0300)
Subject: vfio/fsl-mc: Implement VFIO_DEVICE_GET_INFO ioctl
X-Git-Tag: v5.10-rc1~53^2~5^2~7
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f97f4c04e5d6ca8b90b5b412bd7e72de79426263;p=thirdparty%2Fkernel%2Flinux.git

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>
---

diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
index 5947602032684..161c2cbe07dcc 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:
 	{