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| author |   Juergen Gross <jgross@suse.com> | 2019-06-14 07:46:04 +0200 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2019-08-01 06:39:33 +0200 |
| commit | b877ac9815a8fe7e5f6d7fdde3dc34652408840a (patch) | |
| tree | 0b1477601024cd45a16c092feffde094070cf6cd /include/linux/page-flags.h | |
| parent | xen/swiotlb: simplify range_straddles_page_boundary() (diff) | |
| download | wireguard-linux-b877ac9815a8fe7e5f6d7fdde3dc34652408840a.tar.xz wireguard-linux-b877ac9815a8fe7e5f6d7fdde3dc34652408840a.zip | |
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/linux/page-flags.h')
| -rw-r--r-- | include/linux/page-flags.h | 4 |
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) |