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: Joerg Roedel <jroedel@suse.de>
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 39a2048..c657e48 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1633,8 +1633,7 @@
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 @@
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);