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| author | Yan Zhao <yan.y.zhao@intel.com> | 2020-03-24 18:27:57 +0300 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2020-03-24 18:27:57 +0300 |
| commit | 40280cf7e8ca7d31bb0a9d626f36f458fec32815 (patch) | |
| tree | cc55f06e79d3e7d99ae50e9f5a27b58b36153599 /include/linux/vfio.h | |
| parent | 8d46c0cca5f4dc0538173d62cd36b1119b5105bc (diff) | |
| download | linux-40280cf7e8ca7d31bb0a9d626f36f458fec32815.tar.xz | |
vfio: avoid inefficient operations on VFIO group in vfio_pin/unpin_pages
vfio_group_pin_pages() and vfio_group_unpin_pages() are introduced to
avoid inefficient search/check/ref/deref opertions associated with VFIO
group as those in each calling into vfio_pin_pages() and
vfio_unpin_pages().
VFIO group is taken as arg directly. The callers combine
search/check/ref/deref operations associated with VFIO group by calling
vfio_group_get_external_user()/vfio_group_get_external_user_from_dev()
beforehand, and vfio_group_put_external_user() afterwards.
Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'include/linux/vfio.h')
| -rw-r--r-- | include/linux/vfio.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/vfio.h b/include/linux/vfio.h index 34b2fdf4de6e..be2bd358b952 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -111,6 +111,12 @@ extern int vfio_pin_pages(struct device *dev, unsigned long *user_pfn, extern int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn, int npage); +extern int vfio_group_pin_pages(struct vfio_group *group, + unsigned long *user_iova_pfn, int npage, + int prot, unsigned long *phys_pfn); +extern int vfio_group_unpin_pages(struct vfio_group *group, + unsigned long *user_iova_pfn, int npage); + extern int vfio_dma_rw(struct vfio_group *group, dma_addr_t user_iova, void *data, size_t len, bool write); |