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KVM: s390: Set virtio-ccw transport revision

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With the new SET-VIRTIO-REVISION command of the virtio 1.0 standard, we
can now negotiate the virtio-ccw revision after setting a channel online.

Note that we don't negotiate version 1 yet.

[Cornelia Huck: reworked revision loop a bit]
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Thomas Huth 2014-10-07 16:39:50 +02:00 committed by Michael S. Tsirkin
parent 19c1c5a64c
commit 6bb2c835c7
1 changed files with 63 additions and 0 deletions
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63
drivers/s390/kvm/virtio_ccw.c
View file

@ -55,6 +55,7 @@ struct virtio_ccw_device {
struct ccw_device *cdev;
__u32 curr_io;
int err;
unsigned int revision; /* Transport revision */
wait_queue_head_t wait_q;
spinlock_t lock;
struct list_head virtqueues;
@ -86,6 +87,15 @@ struct virtio_thinint_area {
u8 isc;
} __packed;
struct virtio_rev_info {
__u16 revision;
__u16 length;
__u8 data[];
};
/* the highest virtio-ccw revision we support */
#define VIRTIO_CCW_REV_MAX 0
struct virtio_ccw_vq_info {
struct virtqueue *vq;
int num;
@ -122,6 +132,7 @@ static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
#define CCW_CMD_WRITE_STATUS 0x31
#define CCW_CMD_READ_VQ_CONF 0x32
#define CCW_CMD_SET_IND_ADAPTER 0x73
#define CCW_CMD_SET_VIRTIO_REV 0x83
#define VIRTIO_CCW_DOING_SET_VQ 0x00010000
#define VIRTIO_CCW_DOING_RESET 0x00040000
@ -134,6 +145,7 @@ static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
#define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
#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_INTPARM_MASK 0xffff0000
static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev)
@ -933,6 +945,7 @@ static void virtio_ccw_int_handler(struct ccw_device *cdev,
case VIRTIO_CCW_DOING_RESET:
case VIRTIO_CCW_DOING_READ_VQ_CONF:
case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
vcdev->curr_io &= ~activity;
wake_up(&vcdev->wait_q);
break;
@ -1048,6 +1061,51 @@ static int virtio_ccw_offline(struct ccw_device *cdev)
return 0;
}
static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
{
struct virtio_rev_info *rev;
struct ccw1 *ccw;
int ret;
ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
if (!ccw)
return -ENOMEM;
rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL);
if (!rev) {
kfree(ccw);
return -ENOMEM;
}
/* Set transport revision */
ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
ccw->flags = 0;
ccw->count = sizeof(*rev);
ccw->cda = (__u32)(unsigned long)rev;
vcdev->revision = VIRTIO_CCW_REV_MAX;
do {
rev->revision = vcdev->revision;
/* none of our supported revisions carry payload */
rev->length = 0;
ret = ccw_io_helper(vcdev, ccw,
VIRTIO_CCW_DOING_SET_VIRTIO_REV);
if (ret == -EOPNOTSUPP) {
if (vcdev->revision == 0)
/*
* The host device does not support setting
* the revision: let's operate it in legacy
* mode.
*/
ret = 0;
else
vcdev->revision--;
}
} while (ret == -EOPNOTSUPP);
kfree(ccw);
kfree(rev);
return ret;
}
static int virtio_ccw_online(struct ccw_device *cdev)
{
@ -1088,6 +1146,11 @@ static int virtio_ccw_online(struct ccw_device *cdev)
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
vcdev->vdev.id.vendor = cdev->id.cu_type;
vcdev->vdev.id.device = cdev->id.cu_model;
ret = virtio_ccw_set_transport_rev(vcdev);
if (ret)
goto out_free;
ret = register_virtio_device(&vcdev->vdev);
if (ret) {
dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",