[PATCH RFC v2 08/12] vfio/ccw: get io region info

Dong Jia Shi
2017-01-12T07:25:09Z

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: Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
---
hw/vfio/ccw.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 52 insertions(+)

diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 881010b..93394c2 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -21,11 +21,15 @@
#include "hw/vfio/vfio-common.h"
#include "hw/s390x/s390-ccw.h"
#include "hw/s390x/ccw-device.h"
+#include "standard-headers/asm-s390/vfio_ccw.h"

#define TYPE_VFIO_CCW "vfio-ccw"
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 +54,46 @@ 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_NUM_REGIONS) {
+ 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(errp, "vfio: Error getting config info: %d", ret);
+ 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");
+ 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);
@@ -144,8 +188,15 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
goto out_device_err;
}

+ vfio_ccw_get_region(vcdev, errp);
+ if (*errp) {
+ goto out_region_err;
+ }
+
return;

+out_region_err:
+ vfio_put_device(vcdev);
out_device_err:
vfio_ccw_put_group(group, path);
out_group_err:
@@ -166,6 +217,7 @@ static void vfio_ccw_unrealize(DeviceState *dev, Error **errp)
cdc->unrealize(cdev, errp);
}

+ vfio_ccw_put_region(vcdev);
vfio_put_device(vcdev);
vfio_put_group(group);
}
--
2.8.4