diff options
| author | Yong Wu <[email protected]> | 2020-12-07 17:35:53 +0800 |
|---|---|---|
| committer | Will Deacon <[email protected]> | 2020-12-07 10:49:34 +0000 |
| commit | 093b32a849b336b5b48bdde1041fc06f91ae475c (patch) | |
| tree | 824c546de9567462e6cfa887d3829e77fb7f9735 /scripts/bpf_helpers_doc.py | |
| parent | 058236eef606ea53ea7317afc20e9469cf3c3b91 (diff) | |
iommu: Improve the performance for direct_mapping
Currently direct_mapping always use the smallest pgsize which is SZ_4K
normally to mapping. This is unnecessary. we could gather the size, and
call iommu_map then, iommu_map could decide how to map better with the
just right pgsize.
>From the original comment, we should take care overlap, otherwise,
iommu_map may return -EEXIST. In this overlap case, we should map the
previous region before overlap firstly. then map the left part.
Each a iommu device will call this direct_mapping when its iommu
initialize, This patch is effective to improve the boot/initialization
time especially while it only needs level 1 mapping.
Signed-off-by: Anan Sun <[email protected]>
Signed-off-by: Yong Wu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>
Diffstat (limited to 'scripts/bpf_helpers_doc.py')
0 files changed, 0 insertions, 0 deletions