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authorWei Liu <wei.liu2@citrix.com>2015-04-03 09:44:59 +0300
committerDavid Vrabel <david.vrabel@citrix.com>2015-04-15 12:56:47 +0300
commitccc9d90a9a8b5c4ad7e9708ec41f75ff9e98d61d (patch)
tree2a147c10a289a3f4283d6008708297f07df052a6 /drivers/char
parent278edfc07875779a69277f6c5773ec9318a994ee (diff)
downloadlinux-ccc9d90a9a8b5c4ad7e9708ec41f75ff9e98d61d.tar.xz
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.c5
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)