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S390: ccw firmware: Add virtio device drivers
In order to boot, we need to be able to access a virtio-blk device throughthe CCW bus. Implement support for this.
Signed-off-by: Alexander Graf <agraf@suse.de>
s390-ccw.img: Fix compile warning in s390 ccw virtio code
Lets fix this gcc warning:
virtio.c: In function ‘vring_send_buf’:virtio.c:125:35: error: operation on ‘vr->next_idx’ may be undefined[-Werror=sequence-point]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>...
s390-ccw.img: Enhance drain_irqs().
- Use tpi + tsch to get interrupts.- Return an error if the irb indicates problems.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>Signed-off-by: Alexander Graf <agraf@suse.de>
s390-ccw.img: Rudimentary error checking.
Try to handle at least some of the errors that may happen.
s390-ccw.img: Get queue config from host.
Ask the host about the configuration instead of guessing it.