Commit 8cb612a2 authored Sep 29, 2020 by Patrick Daly

dma-mapping-fast: Ensure reserved iovas are actually reserved



"mapping->clean_bitmap" holds the iovas which are currently available.
"mapping->bitmap" holds the iovas which will be available after a tlb
invalidate operation.
For an iova to be reserved properly, it needs to be set in both of the
above bitmaps.

Fixes: 07972090 ("dma-mapping-fast: reduce TLBI during map")
Change-Id: I163e63fd1dfc8161733f56d796a9f0a781fd79b1
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>

parent da2e3647

drivers/iommu/dma-mapping-fast.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -893,6 +893,7 @@ static void fast_smmu_reserve_pci_windows(struct device *dev,
		start = (start - mapping->base) >> FAST_PAGE_SHIFT;
		end = (end - mapping->base) >> FAST_PAGE_SHIFT;
		bitmap_set(mapping->bitmap, start, end - start);
		bitmap_set(mapping->clean_bitmap, start, end - start);
		}
		spin_unlock_irqrestore(&mapping->lock, flags);
		}