xen: Introduce shared buffer helpers for page directory...

based frontends. Currently the frontends which implement similar code for sharing big buffers between frontend and backend are para-virtualized DRM and sound drivers. Both define the same way to share grant references of a data buffer with the corresponding backend with little differences. Move shared code into a helper module, so there is a single implementation of the same functionality for all. This patch introduces code which is used by sound and display frontend drivers without functional changes with the intention to remove shared code from the corresponding drivers. Signed-off-by: Oleksandr Andrushchenko <[email protected]> Acked-by: Boris Ostrovsky <[email protected]> Signed-off-by: Boris Ostrovsky <[email protected]>
ambv · Dec 18, 2018 · b338397 · b338397
1 parent 1669907
commit b338397
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diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
@@ -340,4 +340,7 @@ config XEN_SYMS
 config XEN_HAVE_VPMU
        bool
 
+config XEN_FRONT_PGDIR_SHBUF
+	tristate
+
 endmenu
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
@@ -44,3 +44,4 @@ xen-gntdev-y				:= gntdev.o
 xen-gntdev-$(CONFIG_XEN_GNTDEV_DMABUF)	+= gntdev-dmabuf.o
 xen-gntalloc-y				:= gntalloc.o
 xen-privcmd-y				:= privcmd.o privcmd-buf.o
+obj-$(CONFIG_XEN_FRONT_PGDIR_SHBUF)	+= xen-front-pgdir-shbuf.o