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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: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Michael S. Tsirkin 2007-02-10 23:17:26 +02:00 committed by Roland Dreier
parent c7d204e8fd
commit 1d1f19cfce
1 changed files with 4 additions and 0 deletions
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4
drivers/infiniband/hw/mthca/mthca_main.c
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@ -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,