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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
*/
#include <linux/vfio.h>
#include <linux/cdx/cdx_bus.h>
#include "private.h"
static int vfio_cdx_open_device(struct vfio_device *core_vdev)
{
struct vfio_cdx_device *vdev =
container_of(core_vdev, struct vfio_cdx_device, vdev);
struct cdx_device *cdx_dev = to_cdx_device(core_vdev->dev);
int count = cdx_dev->res_count;
int i;
vdev->regions = kcalloc(count, sizeof(struct vfio_cdx_region),
GFP_KERNEL_ACCOUNT);
if (!vdev->regions)
return -ENOMEM;
for (i = 0; i < count; i++) {
struct resource *res = &cdx_dev->res[i];
vdev->regions[i].addr = res->start;
vdev->regions[i].size = resource_size(res);
vdev->regions[i].type = res->flags;
/*
* Only regions addressed with PAGE granularity may be
* MMAP'ed securely.
*/
if (!(vdev->regions[i].addr & ~PAGE_MASK) &&
!(vdev->regions[i].size & ~PAGE_MASK))
vdev->regions[i].flags |=
VFIO_REGION_INFO_FLAG_MMAP;
vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ;
if (!(cdx_dev->res[i].flags & IORESOURCE_READONLY))
vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_WRITE;
}
return 0;
}
static void vfio_cdx_close_device(struct vfio_device *core_vdev)
{
struct vfio_cdx_device *vdev =
container_of(core_vdev, struct vfio_cdx_device, vdev);
kfree(vdev->regions);
cdx_dev_reset(core_vdev->dev);
}
static int vfio_cdx_ioctl_get_info(struct vfio_cdx_device *vdev,
struct vfio_device_info __user *arg)
{
unsigned long minsz = offsetofend(struct vfio_device_info, num_irqs);
struct cdx_device *cdx_dev = to_cdx_device(vdev->vdev.dev);
struct vfio_device_info info;
if (copy_from_user(&info, arg, minsz))
return -EFAULT;
if (info.argsz < minsz)
return -EINVAL;
info.flags = VFIO_DEVICE_FLAGS_CDX;
info.flags |= VFIO_DEVICE_FLAGS_RESET;
info.num_regions = cdx_dev->res_count;
info.num_irqs = 0;
return copy_to_user(arg, &info, minsz) ? -EFAULT : 0;
}
static int vfio_cdx_ioctl_get_region_info(struct vfio_cdx_device *vdev,
struct vfio_region_info __user *arg)
{
unsigned long minsz = offsetofend(struct vfio_region_info, offset);
struct cdx_device *cdx_dev = to_cdx_device(vdev->vdev.dev);
struct vfio_region_info info;
if (copy_from_user(&info, arg, minsz))
return -EFAULT;
if (info.argsz < minsz)
return -EINVAL;
if (info.index >= cdx_dev->res_count)
return -EINVAL;
/* map offset to the physical address */
info.offset = vfio_cdx_index_to_offset(info.index);
info.size = vdev->regions[info.index].size;
info.flags = vdev->regions[info.index].flags;
return copy_to_user(arg, &info, minsz) ? -EFAULT : 0;
}
static long vfio_cdx_ioctl(struct vfio_device *core_vdev,
unsigned int cmd, unsigned long arg)
{
struct vfio_cdx_device *vdev =
container_of(core_vdev, struct vfio_cdx_device, vdev);
void __user *uarg = (void __user *)arg;
switch (cmd) {
case VFIO_DEVICE_GET_INFO:
return vfio_cdx_ioctl_get_info(vdev, uarg);
case VFIO_DEVICE_GET_REGION_INFO:
return vfio_cdx_ioctl_get_region_info(vdev, uarg);
case VFIO_DEVICE_RESET:
return cdx_dev_reset(core_vdev->dev);
default:
return -ENOTTY;
}
}
static int vfio_cdx_mmap_mmio(struct vfio_cdx_region region,
struct vm_area_struct *vma)
{
u64 size = vma->vm_end - vma->vm_start;
u64 pgoff, base;
pgoff = vma->vm_pgoff &
((1U << (VFIO_CDX_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
base = pgoff << PAGE_SHIFT;
if (base + size > region.size)
return -EINVAL;
vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
vma->vm_page_prot = pgprot_device(vma->vm_page_prot);
return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
size, vma->vm_page_prot);
}
static int vfio_cdx_mmap(struct vfio_device *core_vdev,
struct vm_area_struct *vma)
{
struct vfio_cdx_device *vdev =
container_of(core_vdev, struct vfio_cdx_device, vdev);
struct cdx_device *cdx_dev = to_cdx_device(core_vdev->dev);
unsigned int index;
index = vma->vm_pgoff >> (VFIO_CDX_OFFSET_SHIFT - PAGE_SHIFT);
if (index >= cdx_dev->res_count)
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 -EPERM;
if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE) &&
(vma->vm_flags & VM_WRITE))
return -EPERM;
return vfio_cdx_mmap_mmio(vdev->regions[index], vma);
}
static const struct vfio_device_ops vfio_cdx_ops = {
.name = "vfio-cdx",
.open_device = vfio_cdx_open_device,
.close_device = vfio_cdx_close_device,
.ioctl = vfio_cdx_ioctl,
.mmap = vfio_cdx_mmap,
.bind_iommufd = vfio_iommufd_physical_bind,
.unbind_iommufd = vfio_iommufd_physical_unbind,
.attach_ioas = vfio_iommufd_physical_attach_ioas,
};
static int vfio_cdx_probe(struct cdx_device *cdx_dev)
{
struct vfio_cdx_device *vdev;
struct device *dev = &cdx_dev->dev;
int ret;
vdev = vfio_alloc_device(vfio_cdx_device, vdev, dev,
&vfio_cdx_ops);
if (IS_ERR(vdev))
return PTR_ERR(vdev);
ret = vfio_register_group_dev(&vdev->vdev);
if (ret)
goto out_uninit;
dev_set_drvdata(dev, vdev);
return 0;
out_uninit:
vfio_put_device(&vdev->vdev);
return ret;
}
static int vfio_cdx_remove(struct cdx_device *cdx_dev)
{
struct device *dev = &cdx_dev->dev;
struct vfio_cdx_device *vdev = dev_get_drvdata(dev);
vfio_unregister_group_dev(&vdev->vdev);
vfio_put_device(&vdev->vdev);
return 0;
}
static const struct cdx_device_id vfio_cdx_table[] = {
{ CDX_DEVICE_DRIVER_OVERRIDE(CDX_ANY_ID, CDX_ANY_ID,
CDX_ID_F_VFIO_DRIVER_OVERRIDE) }, /* match all by default */
{}
};
MODULE_DEVICE_TABLE(cdx, vfio_cdx_table);
static struct cdx_driver vfio_cdx_driver = {
.probe = vfio_cdx_probe,
.remove = vfio_cdx_remove,
.match_id_table = vfio_cdx_table,
.driver = {
.name = "vfio-cdx",
},
.driver_managed_dma = true,
};
module_driver(vfio_cdx_driver, cdx_driver_register, cdx_driver_unregister);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("VFIO for CDX devices - User Level meta-driver");
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