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vfio-cdx: add bus mastering device feature support

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Support Bus master enable and disable on VFIO-CDX devices using
VFIO_DEVICE_FEATURE_BUS_MASTER flag over VFIO_DEVICE_FEATURE IOCTL.

Co-developed-by: Shubham Rohila <shubham.rohila@amd.com>
Signed-off-by: Shubham Rohila <shubham.rohila@amd.com>
Signed-off-by: Nipun Gupta <nipun.gupta@amd.com>
Link: https://lore.kernel.org/r/20230915045423.31630-3-nipun.gupta@amd.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Nipun Gupta 2023-09-15 10:24:23 +05:30 committed by Alex Williamson
parent f59a7b6af0
commit 8a97ab9b8b
2 changed files with 58 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
drivers/vfio/cdx/main.c
View File

@ -14,7 +14,7 @@ static int vfio_cdx_open_device(struct vfio_device *core_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;
int i, ret;
vdev->regions = kcalloc(count, sizeof(struct vfio_cdx_region),
GFP_KERNEL_ACCOUNT);
@ -39,6 +39,17 @@ static int vfio_cdx_open_device(struct vfio_device *core_vdev)
if (!(cdx_dev->res[i].flags & IORESOURCE_READONLY))
vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_WRITE;
}
ret = cdx_dev_reset(core_vdev->dev);
if (ret) {
kfree(vdev->regions);
vdev->regions = NULL;
return ret;
}
ret = cdx_clear_master(cdx_dev);
if (ret)
vdev->flags &= ~BME_SUPPORT;
else
vdev->flags |= BME_SUPPORT;
return 0;
}
@ -52,6 +63,49 @@ static void vfio_cdx_close_device(struct vfio_device *core_vdev)
cdx_dev_reset(core_vdev->dev);
}
static int vfio_cdx_bm_ctrl(struct vfio_device *core_vdev, u32 flags,
void __user *arg, size_t argsz)
{
size_t minsz =
offsetofend(struct vfio_device_feature_bus_master, op);
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);
struct vfio_device_feature_bus_master ops;
int ret;
if (!vdev->flags & BME_SUPPORT)
return -ENOTTY;
ret = vfio_check_feature(flags, argsz, VFIO_DEVICE_FEATURE_SET,
sizeof(ops));
if (ret != 1)
return ret;
if (copy_from_user(&ops, arg, minsz))
return -EFAULT;
switch (ops.op) {
case VFIO_DEVICE_FEATURE_CLEAR_MASTER:
return cdx_clear_master(cdx_dev);
case VFIO_DEVICE_FEATURE_SET_MASTER:
return cdx_set_master(cdx_dev);
default:
return -EINVAL;
}
}
static int vfio_cdx_ioctl_feature(struct vfio_device *device, u32 flags,
void __user *arg, size_t argsz)
{
switch (flags & VFIO_DEVICE_FEATURE_MASK) {
case VFIO_DEVICE_FEATURE_BUS_MASTER:
return vfio_cdx_bm_ctrl(device, flags, arg, argsz);
default:
return -ENOTTY;
}
}
static int vfio_cdx_ioctl_get_info(struct vfio_cdx_device *vdev,
struct vfio_device_info __user *arg)
{
@ -169,6 +223,7 @@ static const struct vfio_device_ops vfio_cdx_ops = {
.open_device = vfio_cdx_open_device,
.close_device = vfio_cdx_close_device,
.ioctl = vfio_cdx_ioctl,
.device_feature = vfio_cdx_ioctl_feature,
.mmap = vfio_cdx_mmap,
.bind_iommufd = vfio_iommufd_physical_bind,
.unbind_iommufd = vfio_iommufd_physical_unbind,

2
drivers/vfio/cdx/private.h
View File

@ -23,6 +23,8 @@ struct vfio_cdx_region {
struct vfio_cdx_device {
struct vfio_device vdev;
struct vfio_cdx_region *regions;
u32 flags;
#define BME_SUPPORT BIT(0)
};
#endif /* VFIO_CDX_PRIVATE_H */