path: root/include/xen
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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 /include/xen
parentxen/balloon: Share common memory reservation routines (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 'include/xen')
1 files changed, 18 insertions, 0 deletions
diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h
index de03f2542bb7..9bc5bc07d4d3 100644
--- a/include/xen/grant_table.h
+++ b/include/xen/grant_table.h
@@ -198,6 +198,24 @@ void gnttab_free_auto_xlat_frames(void);
int gnttab_alloc_pages(int nr_pages, struct page **pages);
void gnttab_free_pages(int nr_pages, struct page **pages);
+struct gnttab_dma_alloc_args {
+ /* Device for which DMA memory will be/was allocated. */
+ struct device *dev;
+ /* If set then DMA buffer is coherent and write-combine otherwise. */
+ bool coherent;
+ int nr_pages;
+ struct page **pages;
+ xen_pfn_t *frames;
+ void *vaddr;
+ dma_addr_t dev_bus_addr;
+int gnttab_dma_alloc_pages(struct gnttab_dma_alloc_args *args);
+int gnttab_dma_free_pages(struct gnttab_dma_alloc_args *args);
int gnttab_pages_set_private(int nr_pages, struct page **pages);
void gnttab_pages_clear_private(int nr_pages, struct page **pages);