[PATCH v4 09/16] vfio: ccw: realize VFIO_DEVICE_GET_REGION_INFO ioctl

Dong Jia Shi
2017-03-17T03:46:35Z

Introduce device information about vfio-ccw: VFIO_DEVICE_FLAGS_CCW.
Realize VFIO_DEVICE_GET_REGION_INFO ioctl for vfio-ccw.

Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
---
drivers/s390/cio/vfio_ccw_ops.c | 78 +++++++++++++++++++++++++++++++++++++++++
include/uapi/linux/vfio.h | 11 ++++++
2 files changed, 89 insertions(+)

diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 878c882..f3300dd 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -188,6 +188,83 @@ static ssize_t vfio_ccw_mdev_write(struct mdev_device *mdev,
return count;
}

+static int vfio_ccw_mdev_get_device_info(struct vfio_device_info *info)
+{
+ info->flags = VFIO_DEVICE_FLAGS_CCW;
+ info->num_regions = VFIO_CCW_NUM_REGIONS;
+ info->num_irqs = 0;
+
+ return 0;
+}
+
+static int vfio_ccw_mdev_get_region_info(struct vfio_region_info *info,
+ u16 *cap_type_id,
+ void **cap_type)
+{
+ switch (info->index) {
+ case VFIO_CCW_CONFIG_REGION_INDEX:
+ info->offset = 0;
+ info->size = sizeof(struct ccw_io_region);
+ info->flags = VFIO_REGION_INFO_FLAG_READ
+ | VFIO_REGION_INFO_FLAG_WRITE;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev,
+ unsigned int cmd,
+ unsigned long arg)
+{
+ int ret = 0;
+ unsigned long minsz;
+
+ switch (cmd) {
+ case VFIO_DEVICE_GET_INFO:
+ {
+ struct vfio_device_info info;
+
+ minsz = offsetofend(struct vfio_device_info, num_irqs);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ ret = vfio_ccw_mdev_get_device_info(&info);
+ if (ret)
+ return ret;
+
+ return copy_to_user((void __user *)arg, &info, minsz);
+ }
+ case VFIO_DEVICE_GET_REGION_INFO:
+ {
+ struct vfio_region_info info;
+ u16 cap_type_id = 0;
+ void *cap_type = NULL;
+
+ minsz = offsetofend(struct vfio_region_info, offset);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ ret = vfio_ccw_mdev_get_region_info(&info, &cap_type_id,
+ &cap_type);
+ if (ret)
+ return ret;
+
+ return copy_to_user((void __user *)arg, &info, minsz);
+ }
+ default:
+ return -ENOTTY;
+ }
+}
+
static const struct mdev_parent_ops vfio_ccw_mdev_ops = {
.owner = THIS_MODULE,
.supported_type_groups = mdev_type_groups,
@@ -197,6 +274,7 @@ static const struct mdev_parent_ops vfio_ccw_mdev_ops = {
.release = vfio_ccw_mdev_release,
.read = vfio_ccw_mdev_read,
.write = vfio_ccw_mdev_write,
+ .ioctl = vfio_ccw_mdev_ioctl,
};

int vfio_ccw_mdev_reg(struct subchannel *sch)
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 6183789..3fd70ff 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -198,6 +198,7 @@ struct vfio_device_info {
#define VFIO_DEVICE_FLAGS_PCI (1 << 1) /* vfio-pci device */
#define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2) /* vfio-platform device */
#define VFIO_DEVICE_FLAGS_AMBA (1 << 3) /* vfio-amba device */
+#define VFIO_DEVICE_FLAGS_CCW (1 << 4) /* vfio-ccw device */
__u32 num_regions; /* Max region index + 1 */
__u32 num_irqs; /* Max IRQ index + 1 */
};
@@ -447,6 +448,16 @@ enum {
VFIO_PCI_NUM_IRQS
};

+/*
+ * The vfio-ccw bus driver makes use of the following fixed region.
+ * Unimplemented regions return a size of zero.
+ */
+
+enum {
+ VFIO_CCW_CONFIG_REGION_INDEX,
+ VFIO_CCW_NUM_REGIONS
+};
+
/**
* VFIO_DEVICE_GET_PCI_HOT_RESET_INFO - _IORW(VFIO_TYPE, VFIO_BASE + 12,
* struct vfio_pci_hot_reset_info)
--
2.8.4