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Commit 4eeca8c5 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu/amd: Optimize dma_ops_free_addresses 



Don't flush the iommu tlb when we free something behind the
current next_bit pointer. Update the next_bit pointer
instead and let the flush happen on the next wraparound in
the allocation path.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent ab7032bb

drivers/iommu/amd_iommu.c

+3 −2
Original line number Diff line number Diff line
@@ -1633,8 +1633,7 @@ static void dma_ops_free_addresses(struct dma_ops_domain *dom, 
		return;

#endif



	if (amd_iommu_unmap_flush ||

	    (address + pages > range->next_bit)) {

	if (amd_iommu_unmap_flush) {

		domain_flush_tlb(&dom->domain);

		domain_flush_complete(&dom->domain);

	}
@@ -1642,6 +1641,8 @@ static void dma_ops_free_addresses(struct dma_ops_domain *dom, 
	address = (address % APERTURE_RANGE_SIZE) >> PAGE_SHIFT;



	spin_lock_irqsave(&range->bitmap_lock, flags);

	if (address + pages > range->next_bit)

		range->next_bit = address + pages;

	bitmap_clear(range->bitmap, address, pages);

	spin_unlock_irqrestore(&range->bitmap_lock, flags);