target/linux/layerscape/patches-5.4/821-vfio-0010-vfio-fsl-mc-Map-the-VFIO-region-according-to-the-fla.patch

   1 From 41a18521d40ed19c2e22d8e41cc427d18f082b71 Mon Sep 17 00:00:00 2001
   2 From: Diana Craciun <diana.craciun@nxp.com>
   3 Date: Mon, 18 Nov 2019 16:32:08 +0200
   4 Subject: [PATCH] vfio/fsl-mc: Map the VFIO region according to the flags
   5  received from mc firmware
   6
   7 There are some VFIO regions which are cacheable (QMAN CENA region).
   8 These regions should be mapped cacheable.
   9
  10 Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
  11 ---
  12  drivers/vfio/fsl-mc/vfio_fsl_mc.c | 8 +++++++-
  13  1 file changed, 7 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 @@ -106,6 +106,7 @@ static int vfio_fsl_mc_regions_init(stru
  18                 vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ;
  19                 if (!(mc_dev->regions[i].flags & IORESOURCE_READONLY))
  20                         vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_WRITE;
  21 +               vdev->regions[i].type = mc_dev->regions[i].flags & IORESOURCE_BITS;
  22         }
  23
  24         vdev->num_regions = mc_dev->obj_desc.region_count;
  25 @@ -451,7 +452,12 @@ static int vfio_fsl_mc_mmap_mmio(struct
  26         if (region.size < PAGE_SIZE || base + size > region.size)
  27                 return -EINVAL;
  28
  29 -       vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
  30 +       if (region.type & DPRC_REGION_CACHEABLE) {
  31 +               if (!(region.type & DPRC_REGION_SHAREABLE))
  32 +                       vma->vm_page_prot = pgprot_cached_ns(vma->vm_page_prot);
  33 +       } else
  34 +               vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
  35 +
  36         vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
  37
  38         return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,