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| author |   Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> | 2018-07-20 12:01:46 +0300 |
|---|---|---|
| committer |   Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2018-07-26 23:05:14 -0400 |
| commit | 975ef7ff81bb000af6e6c8e63e81f89f3468dcf7 (patch) | |
| tree | 4613c67c6a592e60631d0957a1e30133bf2a839c /include/uapi/xen/gntdev.h | |
| parent | xen/grant-table: Allow allocating buffers suitable for DMA (diff) | |
| download | linux-dev-975ef7ff81bb000af6e6c8e63e81f89f3468dcf7.tar.xz linux-dev-975ef7ff81bb000af6e6c8e63e81f89f3468dcf7.zip | |
xen/gntdev: Allow mappings for DMA buffers
Allow mappings for DMA backed buffers if grant table module
supports such: this extends grant device to not only map buffers
made of balloon pages, but also from buffers allocated with
dma_alloc_xxx.
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/uapi/xen/gntdev.h')
| -rw-r--r-- | include/uapi/xen/gntdev.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/uapi/xen/gntdev.h b/include/uapi/xen/gntdev.h index 6d1163456c03..4b9d498a31d4 100644 --- a/include/uapi/xen/gntdev.h +++ b/include/uapi/xen/gntdev.h @@ -200,4 +200,19 @@ struct ioctl_gntdev_grant_copy { /* Send an interrupt on the indicated event channel */ #define UNMAP_NOTIFY_SEND_EVENT 0x2 +/* + * Flags to be used while requesting memory mapping's backing storage + * to be allocated with DMA API. + */ + +/* + * The buffer is backed with memory allocated with dma_alloc_wc. + */ +#define GNTDEV_DMA_FLAG_WC (1 << 0) + +/* + * The buffer is backed with memory allocated with dma_alloc_coherent. + */ +#define GNTDEV_DMA_FLAG_COHERENT (1 << 1) + #endif /* __LINUX_PUBLIC_GNTDEV_H__ */ |