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| author | Wei Liu <wei.liu2@citrix.com> | 2015-04-03 08:44:59 +0200 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2015-04-15 11:56:47 +0200 |
| commit | ccc9d90a9a8b5c4ad7e9708ec41f75ff9e98d61d (patch) | |
| tree | 2a147c10a289a3f4283d6008708297f07df052a6 /drivers/block/xen-blkback | |
| parent | xen-pciback: also support disabling of bus-mastering and memory-write-invalidate (diff) | |
| download | linux-ccc9d90a9a8b5c4ad7e9708ec41f75ff9e98d61d.tar.xz linux-ccc9d90a9a8b5c4ad7e9708ec41f75ff9e98d61d.zip | |
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/block/xen-blkback')
| -rw-r--r-- | drivers/block/xen-blkback/xenbus.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c index e3afe97280b1..ff3025922c14 100644 --- a/drivers/block/xen-blkback/xenbus.c +++ b/drivers/block/xen-blkback/xenbus.c @@ -193,7 +193,7 @@ fail: return ERR_PTR(-ENOMEM); } -static int xen_blkif_map(struct xen_blkif *blkif, unsigned long shared_page, +static int xen_blkif_map(struct xen_blkif *blkif, grant_ref_t gref, unsigned int evtchn) { int err; @@ -202,7 +202,8 @@ static int xen_blkif_map(struct xen_blkif *blkif, unsigned long shared_page, if (blkif->irq) return 0; - err = xenbus_map_ring_valloc(blkif->be->dev, shared_page, &blkif->blk_ring); + err = xenbus_map_ring_valloc(blkif->be->dev, &gref, 1, + &blkif->blk_ring); if (err < 0) return err; |