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Support Bus master enable and Bus master disable on CDX bus control. Signed-off-by: Shubham Rohila Signed-off-by: Nipun Gupta --- Changes in v4: - This patch is newly added which uses cdx_set_master() and cdx_clear_master() APIs. drivers/vfio/cdx/main.c | 26 ++++++++++++++++++++++++++ include/uapi/linux/vfio.h | 14 ++++++++++++++ 2 files changed, 40 insertions(+) diff --git a/drivers/vfio/cdx/main.c b/drivers/vfio/cdx/main.c index c376a69d2db2..c39a965716f4 100644 --- a/drivers/vfio/cdx/main.c +++ b/drivers/vfio/cdx/main.c @@ -98,6 +98,30 @@ static int vfio_cdx_ioctl_get_region_info(struct vfio_cdx_device *vdev, return copy_to_user(arg, &info, minsz) ? -EFAULT : 0; } +static int vfio_cdx_ioctl_ctrl(struct vfio_cdx_device *vdev, + struct vfio_device_cdx_ctrl __user *arg) +{ + unsigned long minsz = offsetofend(struct vfio_device_cdx_ctrl, op); + struct cdx_device *cdx_dev = to_cdx_device(vdev->vdev.dev); + struct vfio_device_cdx_ctrl ops; + + if (copy_from_user(&ops, arg, minsz)) + return -EFAULT; + + if (ops.argsz < minsz) + return -EINVAL; + + switch (ops.op) { + case VFIO_CDX_CTRL_CLEAR_MASTER: + cdx_clear_master(cdx_dev); + return 0; + case VFIO_CDX_CTRL_SET_MASTER: + return cdx_set_master(cdx_dev); + default: + return -EINVAL; + } +} + static long vfio_cdx_ioctl(struct vfio_device *core_vdev, unsigned int cmd, unsigned long arg) { @@ -112,6 +136,8 @@ static long vfio_cdx_ioctl(struct vfio_device *core_vdev, return vfio_cdx_ioctl_get_region_info(vdev, uarg); case VFIO_DEVICE_RESET: return cdx_dev_reset(core_vdev->dev); + case VFIO_DEVICE_CDX_CTRL: + return vfio_cdx_ioctl_ctrl(vdev, uarg); default: return -ENOTTY; } diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index 20c804bdc09c..5f6a58f9f8e2 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -1649,6 +1649,20 @@ struct vfio_iommu_spapr_tce_remove { }; #define VFIO_IOMMU_SPAPR_TCE_REMOVE _IO(VFIO_TYPE, VFIO_BASE + 20) +/** + * VFIO_DEVICE_CDX_CTRL - _IO(VFIO_TYPE, VFIO_BASE + 21) + * + * Control CDX device. + * Variable op is set as per the operation required + */ +struct vfio_device_cdx_ctrl { + __u32 argsz; + __u32 op; +#define VFIO_CDX_CTRL_SET_MASTER 0 /* Set Bus Master */ +#define VFIO_CDX_CTRL_CLEAR_MASTER 1 /* Clear Bus Master */ +}; +#define VFIO_DEVICE_CDX_CTRL _IO(VFIO_TYPE, VFIO_BASE + 21) + /* ***************************************************************** */ #endif /* _UAPIVFIO_H */