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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;
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