path: root/drivers/s390/virtio
diff options
authorHalil Pasic <pasic@linux.ibm.com>2019-03-26 12:41:09 +0100
committerHeiko Carstens <heiko.carstens@de.ibm.com>2019-06-15 12:25:00 +0200
commit37db8985b2116c89a3cbaf87083a02f83afaba5b (patch)
tree6773488a5f73993f894e4bc164afb4d8c23a9460 /drivers/s390/virtio
parents390/cio: introduce DMA pools to cio (diff)
s390/cio: add basic protected virtualization support
As virtio-ccw devices are channel devices, we need to use the dma area within the common I/O layer for any communication with the hypervisor. Note that we do not need to use that area for control blocks directly referenced by instructions, e.g. the orb. It handles neither QDIO in the common code, nor any device type specific stuff (like channel programs constructed by the DASD driver). An interesting side effect is that virtio structures are now going to get allocated in 31 bit addressable storage. Signed-off-by: Halil Pasic <pasic@linux.ibm.com> Reviewed-by: Sebastian Ott <sebott@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Michael Mueller <mimu@linux.ibm.com> Tested-by: Michael Mueller <mimu@linux.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'drivers/s390/virtio')
1 files changed, 0 insertions, 10 deletions
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index 6a3076881321..f995798bb025 100644
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -66,7 +66,6 @@ struct virtio_ccw_device {
bool device_lost;
unsigned int config_ready;
void *airq_info;
- u64 dma_mask;
struct vq_info_block_legacy {
@@ -1255,16 +1254,7 @@ static int virtio_ccw_online(struct ccw_device *cdev)
ret = -ENOMEM;
goto out_free;
vcdev->vdev.dev.parent = &cdev->dev;
- cdev->dev.dma_mask = &vcdev->dma_mask;
- /* we are fine with common virtio infrastructure using 64 bit DMA */
- ret = dma_set_mask_and_coherent(&cdev->dev, DMA_BIT_MASK(64));
- if (ret) {
- dev_warn(&cdev->dev, "Failed to enable 64-bit DMA.\n");
- goto out_free;
- }
vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
if (!vcdev->config_block) {