Commit:     1d1f19cfce7687b557cebdc41bf8a5eeba8a9882
Parent:     c7d204e8fdf02f88d91707213f473805bcfb977b
Author:     Michael S. Tsirkin <[EMAIL PROTECTED]>
AuthorDate: Sat Feb 10 23:17:26 2007 +0200
Committer:  Roland Dreier <[EMAIL PROTECTED]>
CommitDate: Mon Feb 12 16:16:29 2007 -0800

    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 <[EMAIL PROTECTED]>
    Signed-off-by: Roland Dreier <[EMAIL PROTECTED]>
 drivers/infiniband/hw/mthca/mthca_main.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/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 * 
+                                          dma_get_cache_alignment()) / 
        mdev->mr_table.mtt_table = mthca_alloc_icm_table(mdev, 
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