[PATCH v7 08/13] vfio/ccw: get io region info

Dong Jia Shi
2017-05-05T02:03:47Z

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@linux.vnet.ibm.com>
---
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);

--
2.10.2