diff options
| author | Wei Liu <wei.liu2@citrix.com> | 2015-04-03 14:44:59 +0800 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2015-04-15 10:56:47 +0100 |
| commit | ccc9d90a9a8b5c4ad7e9708ec41f75ff9e98d61d (patch) | |
| tree | 2a147c10a289a3f4283d6008708297f07df052a6 /drivers/char | |
| parent | 278edfc07875779a69277f6c5773ec9318a994ee (diff) | |
| download | linux-ccc9d90a9a8b5c4ad7e9708ec41f75ff9e98d61d.tar.bz2 | |
xenbus_client: Extend interface to support multi-page ring
Originally Xen PV drivers only use single-page ring to pass along
information. This might limit the throughput between frontend and
backend.
The patch extends Xenbus driver to support multi-page ring, which in
general should improve throughput if ring is the bottleneck. Changes to
various frontend / backend to adapt to the new interface are also
included.
Affected Xen drivers:
* blkfront/back
* netfront/back
* pcifront/back
* scsifront/back
* vtpmfront
The interface is documented, as before, in xenbus_client.c.
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: Bob Liu <bob.liu@oracle.com>
Cc: Konrad Wilk <konrad.wilk@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/xen-tpmfront.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c index c3b4f5a5ac10..3111f2778079 100644 --- a/drivers/char/tpm/xen-tpmfront.c +++ b/drivers/char/tpm/xen-tpmfront.c @@ -193,6 +193,7 @@ static int setup_ring(struct xenbus_device *dev, struct tpm_private *priv) struct xenbus_transaction xbt; const char *message = NULL; int rv; + grant_ref_t gref; priv->shr = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO); if (!priv->shr) { @@ -200,11 +201,11 @@ static int setup_ring(struct xenbus_device *dev, struct tpm_private *priv) return -ENOMEM; } - rv = xenbus_grant_ring(dev, virt_to_mfn(priv->shr)); + rv = xenbus_grant_ring(dev, &priv->shr, 1, &gref); if (rv < 0) return rv; - priv->ring_ref = rv; + priv->ring_ref = gref; rv = xenbus_alloc_evtchn(dev, &priv->evtchn); if (rv) |