[PATCH RFC 4/8] vfio: ccw: realize VFIO_DEVICE_GET_INFO ioctl

Dong Jia Shi
2016-04-29T12:11:51Z

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

Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
---
drivers/vfio/ccw/vfio_ccw.c | 20 ++++++++++++++++++++
include/uapi/linux/vfio.h | 1 +
2 files changed, 21 insertions(+)

diff --git a/drivers/vfio/ccw/vfio_ccw.c b/drivers/vfio/ccw/vfio_ccw.c
index 8b0acae..7331aed 100644
--- a/drivers/vfio/ccw/vfio_ccw.c
+++ b/drivers/vfio/ccw/vfio_ccw.c
@@ -58,6 +58,26 @@ static void vfio_ccw_release(void *device_data)
static long vfio_ccw_ioctl(void *device_data, unsigned int cmd,
unsigned long arg)
{
+ unsigned long minsz;
+
+ if (cmd == 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;
+
+ info.flags = VFIO_DEVICE_FLAGS_CCW;
+ info.num_regions = 0;
+ info.num_irqs = 0;
+
+ return copy_to_user((void __user *)arg, &info, minsz);
+ }
+
return -ENOTTY;
}

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 255a211..aaedfcd 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 */
};
--
2.6.6