From a84c690e10ae03f1cddec908ac7f5068ceed67a8 Mon Sep 17 00:00:00 2001 From: Joao Martins Date: Thu, 27 Jun 2024 12:01:01 +0100 Subject: [PATCH] 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 Reviewed-by: Kevin Tian Tested-by: Matt Ochs Signed-off-by: Jason Gunthorpe --- drivers/iommu/iommufd/iova_bitmap.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/iommu/iommufd/iova_bitmap.c b/drivers/iommu/iommufd/iova_bitmap.c index e33ddfc239b5b..2b87ea16ad669 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; } -- 2.39.5