target/linux/layerscape/patches-5.4/821-vfio-0003-vfio-fsl-mc-Implement-VFIO_DEVICE_GET_INFO-ioctl.patch

   1 From a548dc00536e2cc6e7e7f95487f5261b3133a0d7 Mon Sep 17 00:00:00 2001
   2 From: Diana Craciun <diana.craciun@nxp.com>
   3 Date: Wed, 18 Sep 2019 18:26:14 +0300
   4 Subject: [PATCH] vfio/fsl-mc: Implement VFIO_DEVICE_GET_INFO ioctl
   5
   6 Allow userspace to get fsl-mc device info (number of regions
   7 and irqs).
   8
   9 Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
  10 Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
  11 ---
  12  drivers/vfio/fsl-mc/vfio_fsl_mc.c | 22 +++++++++++++++++++++-
  13  1 file changed, 21 insertions(+), 1 deletion(-)
  14
  15 --- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
  16 +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
  17 @@ -32,10 +32,30 @@ static void vfio_fsl_mc_release(void *de
  18  static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
  19                               unsigned long arg)
  20  {
  21 +       unsigned long minsz;
  22 +       struct vfio_fsl_mc_device *vdev = device_data;
  23 +       struct fsl_mc_device *mc_dev = vdev->mc_dev;
  24 +
  25         switch (cmd) {
  26         case VFIO_DEVICE_GET_INFO:
  27         {
  28 -               return -EINVAL;
  29 +               struct vfio_device_info info;
  30 +
  31 +               minsz = offsetofend(struct vfio_device_info, num_irqs);
  32 +
  33 +               if (copy_from_user(&info, (void __user *)arg, minsz))
  34 +                       return -EFAULT;
  35 +
  36 +               if (info.argsz < minsz)
  37 +                       return -EINVAL;
  38 +
  39 +               info.flags = VFIO_DEVICE_FLAGS_FSL_MC;
  40 +               info.num_regions = mc_dev->obj_desc.region_count;
  41 +               info.num_irqs = mc_dev->obj_desc.irq_count;
  42 +
  43 +               return copy_to_user((void __user *)arg, &info, minsz) ?
  44 +                       -EFAULT : 0;
  45 +
  46         }
  47         case VFIO_DEVICE_GET_REGION_INFO:
  48         {