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authorOleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>2018-07-20 12:01:45 +0300
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2018-07-26 23:05:14 -0400
commit9bdc7304f536f3f77f0a69e7c3a8f5afda561a68 (patch)
treeb2d1da458c919c4e78b6f3cb65a89f8cce15cd45 /drivers/xen/Kconfig
parentae4c51a50c990d6feba7058c181dc8f22ca5f1d8 (diff)
xen/grant-table: Allow allocating buffers suitable for DMA
Extend grant table module API to allow allocating buffers that can be used for DMA operations and mapping foreign grant references on top of those. The resulting buffer is similar to the one allocated by the balloon driver in that proper memory reservation is made by ({increase|decrease}_reservation and VA mappings are updated if needed). This is useful for sharing foreign buffers with HW drivers which cannot work with scattered buffers provided by the balloon driver, but require DMAable memory instead. Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers/xen/Kconfig')
-rw-r--r--drivers/xen/Kconfig14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index e5d0c28372ea..75e5c40f80a5 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -161,6 +161,20 @@ config XEN_GRANT_DEV_ALLOC
to other domains. This can be used to implement frontend drivers
or as part of an inter-domain shared memory channel.
+config XEN_GRANT_DMA_ALLOC
+ bool "Allow allocating DMA capable buffers with grant reference module"
+ depends on XEN && HAS_DMA
+ help
+ Extends grant table module API to allow allocating DMA capable
+ buffers and mapping foreign grant references on top of it.
+ The resulting buffer is similar to one allocated by the balloon
+ driver in that proper memory reservation is made by
+ ({increase|decrease}_reservation and VA mappings are updated if
+ needed).
+ This is useful for sharing foreign buffers with HW drivers which
+ cannot work with scattered buffers provided by the balloon driver,
+ but require DMAable memory instead.
+
config SWIOTLB_XEN
def_bool y
select SWIOTLB