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| author | Joao Martins <joao.m.martins@oracle.com> | 2024-06-27 14:01:01 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2024-06-28 19:12:23 +0300 |
| commit | a84c690e10ae03f1cddec908ac7f5068ceed67a8 (patch) | |
| tree | 59f5d2c0f0d1b137c1b6bd1b5052574d52b1dc60 /drivers | |
| parent | 792583656f554e35383d6b2325371c8fe056a56b (diff) | |
| download | linux-a84c690e10ae03f1cddec908ac7f5068ceed67a8.tar.xz | |
iommufd/iova_bitmap: Cache mapped length in iova_bitmap_map struct
The amount of IOVA mapped will be used more often in iova_bitmap_set() in
preparation to dynamically iterate the bitmap. Cache said length to avoid
having to calculate it all the time.
Link: https://lore.kernel.org/r/20240627110105.62325-8-joao.m.martins@oracle.com
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Matt Ochs <mochs@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/iommufd/iova_bitmap.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/iommu/iommufd/iova_bitmap.c b/drivers/iommu/iommufd/iova_bitmap.c index e33ddfc239b5..2b87ea16ad66 100644 --- a/drivers/iommu/iommufd/iova_bitmap.c +++ b/drivers/iommu/iommufd/iova_bitmap.c @@ -35,6 +35,9 @@ struct iova_bitmap_map { /* base IOVA representing bit 0 of the first page */ unsigned long iova; + /* mapped length */ + unsigned long length; + /* page size order that each bit granules to */ unsigned long pgshift; @@ -156,6 +159,8 @@ static unsigned long iova_bitmap_mapped_iova(struct iova_bitmap *bitmap) return bitmap->iova + iova_bitmap_index_to_offset(bitmap, skip); } +static unsigned long iova_bitmap_mapped_length(struct iova_bitmap *bitmap); + /* * Pins the bitmap user pages for the current range window. * This is internal to IOVA bitmap and called when advancing the @@ -206,6 +211,7 @@ static int iova_bitmap_get(struct iova_bitmap *bitmap) * aligned. */ mapped->pgoff = offset_in_page(addr); + mapped->length = iova_bitmap_mapped_length(bitmap); return 0; } |