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| author | Wei Liu <wei.liu2@citrix.com> | 2015-04-03 09:44:59 +0300 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2015-04-15 12:56:47 +0300 |
| commit | ccc9d90a9a8b5c4ad7e9708ec41f75ff9e98d61d (patch) | |
| tree | 2a147c10a289a3f4283d6008708297f07df052a6 /include/xen/xenbus.h | |
| parent | 278edfc07875779a69277f6c5773ec9318a994ee (diff) | |
| download | linux-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 'include/xen/xenbus.h')
| -rw-r--r-- | include/xen/xenbus.h | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h index b0f1c9e5d687..289c0b5f08fe 100644 --- a/include/xen/xenbus.h +++ b/include/xen/xenbus.h @@ -46,6 +46,10 @@ #include <xen/interface/io/xenbus.h> #include <xen/interface/io/xs_wire.h> +#define XENBUS_MAX_RING_PAGE_ORDER 4 +#define XENBUS_MAX_RING_PAGES (1U << XENBUS_MAX_RING_PAGE_ORDER) +#define INVALID_GRANT_HANDLE (~0U) + /* Register callback to watch this node. */ struct xenbus_watch { @@ -199,15 +203,19 @@ int xenbus_watch_pathfmt(struct xenbus_device *dev, struct xenbus_watch *watch, const char *pathfmt, ...); int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state new_state); -int xenbus_grant_ring(struct xenbus_device *dev, unsigned long ring_mfn); -int xenbus_map_ring_valloc(struct xenbus_device *dev, - int gnt_ref, void **vaddr); -int xenbus_map_ring(struct xenbus_device *dev, int gnt_ref, - grant_handle_t *handle, void *vaddr); +int xenbus_grant_ring(struct xenbus_device *dev, void *vaddr, + unsigned int nr_pages, grant_ref_t *grefs); +int xenbus_map_ring_valloc(struct xenbus_device *dev, grant_ref_t *gnt_refs, + unsigned int nr_grefs, void **vaddr); +int xenbus_map_ring(struct xenbus_device *dev, + grant_ref_t *gnt_refs, unsigned int nr_grefs, + grant_handle_t *handles, unsigned long *vaddrs, + bool *leaked); int xenbus_unmap_ring_vfree(struct xenbus_device *dev, void *vaddr); int xenbus_unmap_ring(struct xenbus_device *dev, - grant_handle_t handle, void *vaddr); + grant_handle_t *handles, unsigned int nr_handles, + unsigned long *vaddrs); int xenbus_alloc_evtchn(struct xenbus_device *dev, int *port); int xenbus_free_evtchn(struct xenbus_device *dev, int port); |