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vfio/ccw: get io region info 

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.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Message-Id: <20170517004813.58227-9-bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Dong Jia Shi 2017-05-17 02:48:08 +02:00 committed by Cornelia Huck
parent 1dcac3e152
commit c14e706ce9
1 changed files with 54 additions and 0 deletions
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54
hw/vfio/ccw.c
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@ -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);