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| author | Michael S. Tsirkin <mst@mellanox.co.il> | 2007-02-10 22:17:26 +0100 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2007-02-13 01:16:29 +0100 |
| commit | 1d1f19cfce7687b557cebdc41bf8a5eeba8a9882 (patch) | |
| tree | 3e9aa12df4777242a7607dd580d0c36945b8f634 | |
| parent | IB/mthca: Fix reserved MTTs calculation on mem-free HCAs (diff) | |
| download | linux-1d1f19cfce7687b557cebdc41bf8a5eeba8a9882.tar.xz linux-1d1f19cfce7687b557cebdc41bf8a5eeba8a9882.zip | |
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>
| -rw-r--r-- | 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 b/drivers/infiniband/hw/mthca/mthca_main.c index 44bc6cc734ab..9a9dd32885a0 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, |