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pc-bios/s390-ccw: add simplified virtio call

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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>
This commit is contained in:
Eugene (jno) Dvurechenski 2015-10-28 11:12:13 +01:00 • committed by Cornelia Huck
parent a1102cebbf
commit 8944edc3dd
2 changed files with 26 additions and 0 deletions
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17
pc-bios/s390-ccw/virtio.c
View file

@ -225,6 +225,23 @@ static int vring_wait_reply(void)
return 1; 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 * * Virtio block *
***********************************************/ ***********************************************/

9
pc-bios/s390-ccw/virtio.h
View file

@ -248,4 +248,13 @@ typedef struct VDev VDev;
VDev *virtio_get_device(void); VDev *virtio_get_device(void);
VirtioDevType virtio_get_device_type(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 */ #endif /* VIRTIO_H */