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iommu/iova: Limit IOVA alignment using CONFIG_ARM64_DMA_IOMMU_ALIGNMENT

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Currently IOVAs are aligned to the next power of two of the size of the
allocation. This can result in unnecessary fragmentation of the IOVA
space.

If defined use CONFIG_ARM64_DMA_IOMMU_ALIGNMENT to limit the maximum IOVA
alignment.

Change-Id: Ica7f6382237e37acac2d35972a564ca1e1f5e84f
Signed-off-by: Liam Mark <lmark@codeaurora.org>
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
This commit is contained in:
Patrick Daly 2019-05-21 15:17:42 -07:00 • committed by Isaac J. Manjarres
commit 8693c2d4c4
1 changed files with 19 additions and 1 deletions
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20
drivers/iommu/iova.c
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@ -177,6 +177,24 @@ iova_insert_rbtree(struct rb_root *root, struct iova *iova,
rb_insert_color(&iova->node, root);
}
#ifdef CONFIG_ARM64_DMA_IOMMU_ALIGNMENT
static unsigned long limit_align(struct iova_domain *iovad,
unsigned long shift)
{
unsigned long max;
max = CONFIG_ARM64_DMA_IOMMU_ALIGNMENT + PAGE_SHIFT
- iova_shift(iovad);
return min(shift, max);
}
#else
static unsigned long limit_align(struct iova_domain *iovad,
unsigned long shift)
{
return shift;
}
#endif
static int __alloc_and_insert_iova_range(struct iova_domain *iovad,
unsigned long size, unsigned long limit_pfn,
struct iova *new, bool size_aligned)
@ -188,7 +206,7 @@ static int __alloc_and_insert_iova_range(struct iova_domain *iovad,
unsigned long align_mask = ~0UL;
if (size_aligned)
align_mask <<= fls_long(size - 1);
align_mask <<= limit_align(iovad, fls_long(size - 1));
/* Walk the tree backwards */
spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);