On Fri, 5 May 2017 04:03:47 +0200
Dong Jia Shi <bjsdjshi@xxxxxxxxxxxxxxxxxx> wrote:
> vfio-ccw provides an MMIO region for I/O operations. We fetch its
> information via ioctls here, then we can use it performing I/O
> instructions and retrieving I/O results later on.
>
> Signed-off-by: Dong Jia Shi <bjsdjshi@xxxxxxxxxxxxxxxxxx>
> ---
Acked-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
> hw/vfio/ccw.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 54 insertions(+)
>
> diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
> index 7d2497c..7ddcfd7 100644
> --- a/hw/vfio/ccw.c
> +++ b/hw/vfio/ccw.c
> @@ -12,6 +12,7 @@
> */
>
> #include <linux/vfio.h>
> +#include <linux/vfio_ccw.h>
> #include <sys/ioctl.h>
>
> #include "qemu/osdep.h"
> @@ -26,6 +27,9 @@
> typedef struct VFIOCCWDevice {
> S390CCWDevice cdev;
> VFIODevice vdev;
> + uint64_t io_region_size;
> + uint64_t io_region_offset;
> + struct ccw_io_region *io_region;
> } VFIOCCWDevice;
>
> static void vfio_ccw_compute_needs_reset(VFIODevice *vdev)
> @@ -50,6 +54,48 @@ static void vfio_ccw_reset(DeviceState *dev)
> ioctl(vcdev->vdev.fd, VFIO_DEVICE_RESET);
> }
>
> +static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
> +{
> + VFIODevice *vdev = &vcdev->vdev;
> + struct vfio_region_info *info;
> + int ret;
> +
> + /* Sanity check device */
> + if (!(vdev->flags & VFIO_DEVICE_FLAGS_CCW)) {
> + error_setg(errp, "vfio: Um, this isn't a vfio-ccw device");
> + return;
> + }
> +
> + if (vdev->num_regions < VFIO_CCW_CONFIG_REGION_INDEX + 1) {
> + error_setg(errp, "vfio: Unexpected number of the I/O region %u",
> + vdev->num_regions);
> + return;
> + }
> +
> + ret = vfio_get_region_info(vdev, VFIO_CCW_CONFIG_REGION_INDEX, &info);
> + if (ret) {
> + error_setg_errno(errp, -ret, "vfio: Error getting config info");
> + return;
> + }
> +
> + vcdev->io_region_size = info->size;
> + if (sizeof(*vcdev->io_region) != vcdev->io_region_size) {
> + error_setg(errp, "vfio: Unexpected size of the I/O region");
> + g_free(info);
> + return;
> + }
> +
> + vcdev->io_region_offset = info->offset;
> + vcdev->io_region = g_malloc0(info->size);
> +
> + g_free(info);
> +}
> +
> +static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
> +{
> + g_free(vcdev->io_region);
> +}
> +
> static void vfio_put_device(VFIOCCWDevice *vcdev)
> {
> g_free(vcdev->vdev.name);
> @@ -122,8 +168,15 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
> goto out_device_err;
> }
>
> + vfio_ccw_get_region(vcdev, &err);
> + if (err) {
> + goto out_region_err;
> + }
> +
> return;
>
> +out_region_err:
> + vfio_put_device(vcdev);
> out_device_err:
> vfio_put_group(group);
> out_group_err:
> @@ -142,6 +195,7 @@ static void vfio_ccw_unrealize(DeviceState *dev, Error **errp)
> S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
> VFIOGroup *group = vcdev->vdev.group;
>
> + vfio_ccw_put_region(vcdev);
> vfio_put_device(vcdev);
> vfio_put_group(group);
>
