virtio/s390: support READ_STATUS command for virtio-ccw

As virtio-1 introduced the possibility of the device manipulating the
status byte, revision 2 of the virtio-ccw transport introduced a means
of getting the status byte from the device via READ_STATUS. Let's wire
it up for revisions >= 2 and fall back to returning the stored status
byte if not supported.

Signed-off-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>

diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index 639ed4e..01e3dcf 100644 (file)
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -145,6 +145,7 @@ static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
 #define CCW_CMD_WRITE_CONF 0x21
 #define CCW_CMD_WRITE_STATUS 0x31
 #define CCW_CMD_READ_VQ_CONF 0x32
+#define CCW_CMD_READ_STATUS 0x72
 #define CCW_CMD_SET_IND_ADAPTER 0x73
 #define CCW_CMD_SET_VIRTIO_REV 0x83
 
@@ -160,6 +161,7 @@ static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000
 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000
+#define VIRTIO_CCW_DOING_READ_STATUS 0x20000000
 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000
 
 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev)
@@ -892,6 +894,28 @@ out_free:
 static u8 virtio_ccw_get_status(struct virtio_device *vdev)
 {
        struct virtio_ccw_device *vcdev = to_vc_device(vdev);
+       u8 old_status = *vcdev->status;
+       struct ccw1 *ccw;
+
+       if (vcdev->revision < 1)
+               return *vcdev->status;
+
+       ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
+       if (!ccw)
+               return old_status;
+
+       ccw->cmd_code = CCW_CMD_READ_STATUS;
+       ccw->flags = 0;
+       ccw->count = sizeof(*vcdev->status);
+       ccw->cda = (__u32)(unsigned long)vcdev->status;
+       ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS);
+/*
+ * If the channel program failed (should only happen if the device
+ * was hotunplugged, and then we clean up via the machine check
+ * handler anyway), vcdev->status was not overwritten and we just
+ * return the old status, which is fine.
+*/
+       kfree(ccw);
 
        return *vcdev->status;
 }
@@ -987,6 +1011,7 @@ static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev,
                case VIRTIO_CCW_DOING_READ_CONFIG:
                case VIRTIO_CCW_DOING_WRITE_CONFIG:
                case VIRTIO_CCW_DOING_WRITE_STATUS:
+               case VIRTIO_CCW_DOING_READ_STATUS:
                case VIRTIO_CCW_DOING_SET_VQ:
                case VIRTIO_CCW_DOING_SET_IND:
                case VIRTIO_CCW_DOING_SET_CONF_IND: