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Commit 1d1f19cf authored by Michael S. Tsirkin's avatar Michael S. Tsirkin Committed by Roland Dreier
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IB/mthca: Give reserved MTTs a separate cache line 



MTTs are allocated in non-cache-coherent memory, so we must give
reserved MTTs their own cache line, to prevent both device and
CPU from writing into the same cache line at the same time.

Signed-off-by: default avatarMichael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent c7d204e8

drivers/infiniband/hw/mthca/mthca_main.c

+4 −0
Original line number Diff line number Diff line
@@ -464,6 +464,10 @@ static int mthca_init_icm(struct mthca_dev *mdev, 
		goto err_unmap_aux;

	}



	/* CPU writes to non-reserved MTTs, while HCA might DMA to reserved mtts */

	mdev->limits.reserved_mtts = ALIGN(mdev->limits.reserved_mtts * MTHCA_MTT_SEG_SIZE,

					   dma_get_cache_alignment()) / MTHCA_MTT_SEG_SIZE;



	mdev->mr_table.mtt_table = mthca_alloc_icm_table(mdev, init_hca->mtt_base,

							 MTHCA_MTT_SEG_SIZE,

							 mdev->limits.num_mtt_segs,