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authorJuergen Gross <jgross@suse.com>2019-06-14 07:46:04 +0200
committerJuergen Gross <jgross@suse.com>2019-08-01 06:39:33 +0200
commitb877ac9815a8fe7e5f6d7fdde3dc34652408840a (patch)
tree0b1477601024cd45a16c092feffde094070cf6cd /include
parentbf70726668c6116aa4976e0cc87f470be6268a2f (diff)
downloadlinux-b877ac9815a8fe7e5f6d7fdde3dc34652408840a.tar.bz2
xen/swiotlb: remember having called xen_create_contiguous_region()
Instead of always calling xen_destroy_contiguous_region() in case the memory is DMA-able for the used device, do so only in case it has been made DMA-able via xen_create_contiguous_region() before. This will avoid a lot of xen_destroy_contiguous_region() calls for 64-bit capable devices. As the memory in question is owned by swiotlb-xen the PG_owner_priv_1 flag of the first allocated page can be used for remembering. Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/page-flags.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index b848517da64c..f91cb8898ff0 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -152,6 +152,8 @@ enum pageflags {
PG_savepinned = PG_dirty,
/* Has a grant mapping of another (foreign) domain's page. */
PG_foreign = PG_owner_priv_1,
+ /* Remapped by swiotlb-xen. */
+ PG_xen_remapped = PG_owner_priv_1,
/* SLOB */
PG_slob_free = PG_private,
@@ -329,6 +331,8 @@ PAGEFLAG(Pinned, pinned, PF_NO_COMPOUND)
TESTSCFLAG(Pinned, pinned, PF_NO_COMPOUND)
PAGEFLAG(SavePinned, savepinned, PF_NO_COMPOUND);
PAGEFLAG(Foreign, foreign, PF_NO_COMPOUND);
+PAGEFLAG(XenRemapped, xen_remapped, PF_NO_COMPOUND)
+ TESTCLEARFLAG(XenRemapped, xen_remapped, PF_NO_COMPOUND)
PAGEFLAG(Reserved, reserved, PF_NO_COMPOUND)
__CLEARPAGEFLAG(Reserved, reserved, PF_NO_COMPOUND)