diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/821-vfio-0005-vfio-fsl-mc-Allow-userspace-to-MMAP-fsl-mc-device-MM.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/821-vfio-0005-vfio-fsl-mc-Allow-userspace-to-MMAP-fsl-mc-device-MM.patch | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/821-vfio-0005-vfio-fsl-mc-Allow-userspace-to-MMAP-fsl-mc-device-MM.patch b/target/linux/layerscape/patches-5.4/821-vfio-0005-vfio-fsl-mc-Allow-userspace-to-MMAP-fsl-mc-device-MM.patch new file mode 100644 index 0000000000..67bdd20800 --- /dev/null +++ b/target/linux/layerscape/patches-5.4/821-vfio-0005-vfio-fsl-mc-Allow-userspace-to-MMAP-fsl-mc-device-MM.patch @@ -0,0 +1,99 @@ +From 3b81ac2bdcff0f611cad468329cc726600bb23ba Mon Sep 17 00:00:00 2001 +From: Diana Craciun <diana.craciun@nxp.com> +Date: Fri, 27 Sep 2019 16:40:34 +0300 +Subject: [PATCH] vfio/fsl-mc: Allow userspace to MMAP fsl-mc device MMIO + regions + +Allow userspace to mmap device regions for direct access of +fsl-mc devices. + +Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com> +Signed-off-by: Diana Craciun <diana.craciun@nxp.com> +--- + drivers/vfio/fsl-mc/vfio_fsl_mc.c | 65 +++++++++++++++++++++++++++++++++++++-- + 1 file changed, 63 insertions(+), 2 deletions(-) + +--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c ++++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c +@@ -32,7 +32,10 @@ static int vfio_fsl_mc_regions_init(stru + + vdev->regions[i].addr = res->start; + vdev->regions[i].size = PAGE_ALIGN((resource_size(res))); +- vdev->regions[i].flags = 0; ++ vdev->regions[i].flags = VFIO_REGION_INFO_FLAG_MMAP; ++ vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ; ++ if (!(mc_dev->regions[i].flags & IORESOURCE_READONLY)) ++ vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_WRITE; + } + + vdev->num_regions = mc_dev->obj_desc.region_count; +@@ -163,10 +166,68 @@ static ssize_t vfio_fsl_mc_write(void *d + return -EINVAL; + } + ++static int vfio_fsl_mc_mmap_mmio(struct vfio_fsl_mc_region region, ++ struct vm_area_struct *vma) ++{ ++ u64 size = vma->vm_end - vma->vm_start; ++ u64 pgoff, base; ++ ++ pgoff = vma->vm_pgoff & ++ ((1U << (VFIO_FSL_MC_OFFSET_SHIFT - PAGE_SHIFT)) - 1); ++ base = pgoff << PAGE_SHIFT; ++ ++ if (region.size < PAGE_SIZE || base + size > region.size) ++ return -EINVAL; ++ ++ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); ++ ++ vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff; ++ ++ return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, ++ size, vma->vm_page_prot); ++} ++ + static int vfio_fsl_mc_mmap(void *device_data, struct vm_area_struct *vma) + { +- return -EINVAL; ++ struct vfio_fsl_mc_device *vdev = device_data; ++ struct fsl_mc_device *mc_dev = vdev->mc_dev; ++ unsigned long size, addr; ++ int index; ++ ++ index = vma->vm_pgoff >> (VFIO_FSL_MC_OFFSET_SHIFT - PAGE_SHIFT); ++ ++ if (vma->vm_end < vma->vm_start) ++ return -EINVAL; ++ if (vma->vm_start & ~PAGE_MASK) ++ return -EINVAL; ++ if (vma->vm_end & ~PAGE_MASK) ++ return -EINVAL; ++ if (!(vma->vm_flags & VM_SHARED)) ++ return -EINVAL; ++ if (index >= vdev->num_regions) ++ return -EINVAL; ++ ++ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP)) ++ return -EINVAL; ++ ++ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ) ++ && (vma->vm_flags & VM_READ)) ++ return -EINVAL; ++ ++ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE) ++ && (vma->vm_flags & VM_WRITE)) ++ return -EINVAL; ++ ++ addr = vdev->regions[index].addr; ++ size = vdev->regions[index].size; ++ ++ vma->vm_private_data = mc_dev; ++ ++ return vfio_fsl_mc_mmap_mmio(vdev->regions[index], vma); ++ ++ return -EFAULT; + } ++ + static int vfio_fsl_mc_init_device(struct vfio_fsl_mc_device *vdev) + { + struct fsl_mc_device *mc_dev = vdev->mc_dev; |