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authorMichael S. Tsirkin <mst@mellanox.co.il>2007-02-10 23:17:26 +0200
committerRoland Dreier <rolandd@cisco.com>2007-02-12 16:16:29 -0800
commit1d1f19cfce7687b557cebdc41bf8a5eeba8a9882 (patch)
tree3e9aa12df4777242a7607dd580d0c36945b8f634 /drivers
parentc7d204e8fdf02f88d91707213f473805bcfb977b (diff)
downloadop-kernel-dev-1d1f19cfce7687b557cebdc41bf8a5eeba8a9882.zip
op-kernel-dev-1d1f19cfce7687b557cebdc41bf8a5eeba8a9882.tar.gz
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/infiniband/hw/mthca/mthca_main.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_main.c b/drivers/infiniband/hw/mthca/mthca_main.c
index 44bc6cc..9a9dd32 100644
--- a/drivers/infiniband/hw/mthca/mthca_main.c
+++ b/drivers/infiniband/hw/mthca/mthca_main.c
@@ -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,
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