Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1d1f19cfce7687b557cebdc41bf8a5eeba8a9882
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
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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