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   1 From 10abb46294d1569826854f77bcdb5d38d8db8e79 Mon Sep 17 00:00:00 2001
   2 From: Diana Craciun <diana.craciun@nxp.com>
   3 Date: Thu, 26 Sep 2019 15:13:24 +0300
   4 Subject: [PATCH] vfio/fsl-mc: Implement VFIO_DEVICE_GET_REGION_INFO ioctl call
   5
   6 Expose to userspace information about the memory regions.
   7
   8 Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
   9 Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
  10 ---
  11  drivers/vfio/fsl-mc/vfio_fsl_mc.c         | 76 ++++++++++++++++++++++++++++++-
  12  drivers/vfio/fsl-mc/vfio_fsl_mc_private.h | 19 ++++++++
  13  2 files changed, 94 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 @@ -16,16 +16,70 @@
  18  #include "vfio_fsl_mc_private.h"
  19
  20
  21 +static int vfio_fsl_mc_regions_init(struct vfio_fsl_mc_device *vdev)
  22 +{
  23 +       struct fsl_mc_device *mc_dev = vdev->mc_dev;
  24 +       int count = mc_dev->obj_desc.region_count;
  25 +       int i;
  26 +
  27 +       vdev->regions = kcalloc(count, sizeof(struct vfio_fsl_mc_region),
  28 +                               GFP_KERNEL);
  29 +       if (!vdev->regions)
  30 +               return -ENOMEM;
  31 +
  32 +       for (i = 0; i < count; i++) {
  33 +               struct resource *res = &mc_dev->regions[i];
  34 +
  35 +               vdev->regions[i].addr = res->start;
  36 +               vdev->regions[i].size = PAGE_ALIGN((resource_size(res)));
  37 +               vdev->regions[i].flags = 0;
  38 +       }
  39 +
  40 +       vdev->num_regions = mc_dev->obj_desc.region_count;
  41 +       return 0;
  42 +}
  43 +static void vfio_fsl_mc_regions_cleanup(struct vfio_fsl_mc_device *vdev)
  44 +{
  45 +       vdev->num_regions = 0;
  46 +       kfree(vdev->regions);
  47 +}
  48 +
  49  static int vfio_fsl_mc_open(void *device_data)
  50  {
  51 +       struct vfio_fsl_mc_device *vdev = device_data;
  52 +       int ret;
  53 +
  54         if (!try_module_get(THIS_MODULE))
  55                 return -ENODEV;
  56
  57 +       mutex_lock(&vdev->driver_lock);
  58 +       if (!vdev->refcnt) {
  59 +               ret = vfio_fsl_mc_regions_init(vdev);
  60 +               if (ret)
  61 +                       goto err_reg_init;
  62 +       }
  63 +       vdev->refcnt++;
  64 +
  65 +       mutex_unlock(&vdev->driver_lock);
  66         return 0;
  67 +
  68 +err_reg_init:
  69 +       mutex_unlock(&vdev->driver_lock);
  70 +       module_put(THIS_MODULE);
  71 +       return ret;
  72  }
  73
  74  static void vfio_fsl_mc_release(void *device_data)
  75  {
  76 +       struct vfio_fsl_mc_device *vdev = device_data;
  77 +
  78 +       mutex_lock(&vdev->driver_lock);
  79 +
  80 +       if (!(--vdev->refcnt))
  81 +               vfio_fsl_mc_regions_cleanup(vdev);
  82 +
  83 +       mutex_unlock(&vdev->driver_lock);
  84 +
  85         module_put(THIS_MODULE);
  86  }
  87
  88 @@ -59,7 +113,26 @@ static long vfio_fsl_mc_ioctl(void *devi
  89         }
  90         case VFIO_DEVICE_GET_REGION_INFO:
  91         {
  92 -               return -EINVAL;
  93 +               struct vfio_region_info info;
  94 +
  95 +               minsz = offsetofend(struct vfio_region_info, offset);
  96 +
  97 +               if (copy_from_user(&info, (void __user *)arg, minsz))
  98 +                       return -EFAULT;
  99 +
 100 +               if (info.argsz < minsz)
 101 +                       return -EINVAL;
 102 +
 103 +               if (info.index >= vdev->num_regions)
 104 +                       return -EINVAL;
 105 +
 106 +               /* map offset to the physical address  */
 107 +               info.offset = VFIO_FSL_MC_INDEX_TO_OFFSET(info.index);
 108 +               info.size = vdev->regions[info.index].size;
 109 +               info.flags = vdev->regions[info.index].flags;
 110 +
 111 +               return copy_to_user((void __user *)arg, &info, minsz);
 112 +
 113         }
 114         case VFIO_DEVICE_GET_IRQ_INFO:
 115         {
 116 @@ -206,6 +279,7 @@ static int vfio_fsl_mc_probe(struct fsl_
 117                 vfio_iommu_group_put(group, dev);
 118                 return ret;
 119         }
 120 +       mutex_init(&vdev->driver_lock);
 121
 122         return ret;
 123  }
 124 --- a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
 125 +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
 126 @@ -7,8 +7,27 @@
 127  #ifndef VFIO_FSL_MC_PRIVATE_H
 128  #define VFIO_FSL_MC_PRIVATE_H
 129
 130 +#define VFIO_FSL_MC_OFFSET_SHIFT    40
 131 +#define VFIO_FSL_MC_OFFSET_MASK (((u64)(1) << VFIO_FSL_MC_OFFSET_SHIFT) - 1)
 132 +
 133 +#define VFIO_FSL_MC_OFFSET_TO_INDEX(off) (off >> VFIO_FSL_MC_OFFSET_SHIFT)
 134 +
 135 +#define VFIO_FSL_MC_INDEX_TO_OFFSET(index)     \
 136 +       ((u64)(index) << VFIO_FSL_MC_OFFSET_SHIFT)
 137 +
 138 +struct vfio_fsl_mc_region {
 139 +       u32                     flags;
 140 +       u32                     type;
 141 +       u64                     addr;
 142 +       resource_size_t         size;
 143 +};
 144 +
 145  struct vfio_fsl_mc_device {
 146         struct fsl_mc_device            *mc_dev;
 147 +       int                             refcnt;
 148 +       u32                             num_regions;
 149 +       struct vfio_fsl_mc_region       *regions;
 150 +       struct mutex driver_lock;
 151  };
 152
 153  #endif /* VFIO_PCI_PRIVATE_H */