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| author |   Halil Pasic <pasic@linux.ibm.com> | 2019-03-26 12:41:09 +0100 |
|---|---|---|
| committer |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2019-06-15 12:25:00 +0200 |
| commit | 37db8985b2116c89a3cbaf87083a02f83afaba5b (patch) | |
| tree | 6773488a5f73993f894e4bc164afb4d8c23a9460 /drivers/s390/cio/ccwreq.c | |
| parent | s390/cio: introduce DMA pools to cio (diff) | |
| download | linux-dev-37db8985b2116c89a3cbaf87083a02f83afaba5b.tar.xz linux-dev-37db8985b2116c89a3cbaf87083a02f83afaba5b.zip | |
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/cio/ccwreq.c')
| -rw-r--r-- | drivers/s390/cio/ccwreq.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/s390/cio/ccwreq.c b/drivers/s390/cio/ccwreq.c index 603268a33ea1..73582a0a2622 100644 --- a/drivers/s390/cio/ccwreq.c +++ b/drivers/s390/cio/ccwreq.c @@ -63,7 +63,7 @@ static void ccwreq_stop(struct ccw_device *cdev, int rc) return; req->done = 1; ccw_device_set_timeout(cdev, 0); - memset(&cdev->private->irb, 0, sizeof(struct irb)); + memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb)); if (rc && rc != -ENODEV && req->drc) rc = req->drc; req->callback(cdev, req->data, rc); @@ -86,7 +86,7 @@ static void ccwreq_do(struct ccw_device *cdev) continue; } /* Perform start function. */ - memset(&cdev->private->irb, 0, sizeof(struct irb)); + memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb)); rc = cio_start(sch, cp, (u8) req->mask); if (rc == 0) { /* I/O started successfully. */ @@ -169,7 +169,7 @@ int ccw_request_cancel(struct ccw_device *cdev) */ static enum io_status ccwreq_status(struct ccw_device *cdev, struct irb *lcirb) { - struct irb *irb = &cdev->private->irb; + struct irb *irb = &cdev->private->dma_area->irb; struct cmd_scsw *scsw = &irb->scsw.cmd; enum uc_todo todo; @@ -187,7 +187,8 @@ static enum io_status ccwreq_status(struct ccw_device *cdev, struct irb *lcirb) CIO_TRACE_EVENT(2, "sensedata"); CIO_HEX_EVENT(2, &cdev->private->dev_id, sizeof(struct ccw_dev_id)); - CIO_HEX_EVENT(2, &cdev->private->irb.ecw, SENSE_MAX_COUNT); + CIO_HEX_EVENT(2, &cdev->private->dma_area->irb.ecw, + SENSE_MAX_COUNT); /* Check for command reject. */ if (irb->ecw[0] & SNS0_CMD_REJECT) return IO_REJECTED; |