[RFC,11/15] s390-bios: Refactor virtio to run channel programs via cio

Commit Message

Jason J. Herne July 5, 2018, 5:25 p.m. UTC

From: "Jason J. Herne" <[e-mail]>

Now that we have a Channel I/O library let's modify virtio boot code to
make use of it for running channel programs.

Signed-off-by: Jason J. Herne <[e-mail]>
Signed-off-by: Jason J. Herne <[e-mail]>
---
 pc-bios/s390-ccw/virtio.c | 21 ++-------------------
 1 file changed, 2 insertions(+), 19 deletions(-)

Patch

diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index aa9da72..5fb49e2 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -92,30 +92,13 @@  int drain_irqs(SubChannelId schid)
 static int run_ccw(VDev *vdev, int cmd, void *ptr, int len)
 {
     Ccw1 ccw = {};
-    CmdOrb orb = {};
-    int r;
-
-    enable_subchannel(vdev->schid);
-
-    /* start subchannel command */
-    orb.fmt = 1;
-    orb.cpa = (u32)(long)&ccw;
-    orb.lpm = 0x80;
 
     ccw.cmd_code = cmd;
     ccw.cda = (long)ptr;
     ccw.count = len;
 
-    r = ssch(vdev->schid, &orb);
-    /*
-     * XXX Wait until device is done processing the CCW. For now we can
-     *     assume that a simple tsch will have finished the CCW processing,
-     *     but the architecture allows for asynchronous operation
-     */
-    if (!r) {
-        r = drain_irqs(vdev->schid);
-    }
-    return r;
+    enable_subchannel(vdev->schid);
+    return do_cio(vdev->schid, ptr2u32(&ccw), CCW_FMT1);
 }
 
 static void vring_init(VRing *vr, VqInfo *info)