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Commit 9ce3a72c authored by Joerg Roedel's avatar Joerg Roedel
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iommu/amd: Free already flushed ring-buffer entries before full-check 



To benefit from IOTLB flushes on other CPUs we have to free
the already flushed IOVAs from the ring-buffer before we do
the queue_ring_full() check.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent ffa080eb

drivers/iommu/amd_iommu.c

+9 −3
Original line number Diff line number Diff line
@@ -1910,15 +1910,21 @@ static void queue_add(struct dma_ops_domain *dom, 
	queue = get_cpu_ptr(dom->flush_queue);

	spin_lock_irqsave(&queue->lock, flags);



	/*

	 * First remove the enries from the ring-buffer that are already

	 * flushed to make the below queue_ring_full() check less likely

	 */

	queue_ring_free_flushed(dom, queue);



	/*

	 * When ring-queue is full, flush the entries from the IOTLB so

	 * that we can free all entries with queue_ring_free_flushed()

	 * below.

	 */

	if (queue_ring_full(queue))

	if (queue_ring_full(queue)) {

		dma_ops_domain_flush_tlb(dom);



		queue_ring_free_flushed(dom, queue);

	}



	idx = queue_ring_add(queue);