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| author |   Juergen Gross <jgross@suse.com> | 2022-06-02 22:23:47 +0300 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2022-06-06 08:54:35 +0200 |
| commit | 02a9e681a3f7998074f39ec265080bf934871530 (patch) | |
| tree | 8cb2d7887ecc0d5a875bbebbaed870a2e45f44d7 /include/xen | |
| parent | arm/xen: Introduce xen_setup_dma_ops() (diff) | |
| download | linux-dev-02a9e681a3f7998074f39ec265080bf934871530.tar.xz linux-dev-02a9e681a3f7998074f39ec265080bf934871530.zip | |
xen/grants: support allocating consecutive grants
For support of virtio via grant mappings in rare cases larger mappings
using consecutive grants are needed. Support those by adding a bitmap
of free grants.
As consecutive grants will be needed only in very rare cases (e.g. when
configuring a virtio device with a multi-page ring), optimize for the
normal case of non-consecutive allocations.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/1654197833-25362-3-git-send-email-olekstysh@gmail.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'include/xen')
| -rw-r--r-- | include/xen/grant_table.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h index 527c9907f99c..e279be353e3f 100644 --- a/include/xen/grant_table.h +++ b/include/xen/grant_table.h @@ -127,10 +127,14 @@ int gnttab_try_end_foreign_access(grant_ref_t ref); */ int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head); +int gnttab_alloc_grant_reference_seq(unsigned int count, grant_ref_t *first); + void gnttab_free_grant_reference(grant_ref_t ref); void gnttab_free_grant_references(grant_ref_t head); +void gnttab_free_grant_reference_seq(grant_ref_t head, unsigned int count); + int gnttab_empty_grant_references(const grant_ref_t *pprivate_head); int gnttab_claim_grant_reference(grant_ref_t *pprivate_head); |