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iommufd/iova_bitmap: Cache mapped length in iova_bitmap_map struct

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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>
This commit is contained in:
Joao Martins 2024-06-27 12:01:01 +01:00 committed by Jason Gunthorpe
parent 792583656f
commit a84c690e10
1 changed files with 6 additions and 0 deletions
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6
drivers/iommu/iommufd/iova_bitmap.c
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@ -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;
}