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authorEugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>2015-10-28 11:12:13 +0100
committerCornelia Huck <cornelia.huck@de.ibm.com>2016-03-23 16:13:38 +0100
commit8944edc3dd9928b10f39194350b035cac0b40d0d (patch)
treeacb6fa798be18e04cb9d46d1a81ab3f9c7cef5e8 /pc-bios
parenta1102cebbfa0c9b3f66641ab97cf2c602c98d220 (diff)
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pc-bios/s390-ccw: add simplified virtio call
Add virtio_run(VirtioCmd) call to use simple declarative approach. Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Diffstat (limited to 'pc-bios')
-rw-r--r--pc-bios/s390-ccw/virtio.c17
-rw-r--r--pc-bios/s390-ccw/virtio.h9
2 files changed, 26 insertions, 0 deletions
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index 56734af..4ab4d47 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -225,6 +225,23 @@ static int vring_wait_reply(void)
return 1;
}
+int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd)
+{
+ VRing *vr = &vdev->vrings[vqid];
+ int i = 0;
+
+ do {
+ vring_send_buf(vr, cmd[i].data, cmd[i].size,
+ cmd[i].flags | (i ? VRING_HIDDEN_IS_CHAIN : 0));
+ } while (cmd[i++].flags & VRING_DESC_F_NEXT);
+
+ vring_wait_reply();
+ if (drain_irqs(vr->schid)) {
+ return -1;
+ }
+ return 0;
+}
+
/***********************************************
* Virtio block *
***********************************************/
diff --git a/pc-bios/s390-ccw/virtio.h b/pc-bios/s390-ccw/virtio.h
index 7b227db..57c71a2 100644
--- a/pc-bios/s390-ccw/virtio.h
+++ b/pc-bios/s390-ccw/virtio.h
@@ -248,4 +248,13 @@ typedef struct VDev VDev;
VDev *virtio_get_device(void);
VirtioDevType virtio_get_device_type(void);
+struct VirtioCmd {
+ void *data;
+ int size;
+ int flags;
+};
+typedef struct VirtioCmd VirtioCmd;
+
+int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd);
+
#endif /* VIRTIO_H */