I see...
> Region 0: Memory at 400c0800000 (64-bit, non-prefetchable) [size=1M]
> Region 2: Memory at 400c0000000 (64-bit, prefetchable) [size=8M]
> Capabilities: [40] MSI-X: Enable- Mask- TabSize=32
you are running an HCA with the 3rd BAR hidden.
Can you try the patch below and see if things work better?
diff --git a/drivers/infiniband/hw/mthca/mthca_mr.c
b/drivers/infiniband/hw/mthca/mthca_mr.c
index fdb576d..818c27e 100644
--- a/drivers/infiniband/hw/mthca/mthca_mr.c
+++ b/drivers/infiniband/hw/mthca/mthca_mr.c
@@ -926,7 +926,9 @@ int mthca_init_mr_table(struct mthca_dev *dev)
dev->mr_table.fmr_mtt_buddy =
&dev->mr_table.tavor_fmr.mtt_buddy;
- } else
+ } else if (dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN)
+ dev->mr_table.fmr_mtt_buddy = NULL;
+ else
dev->mr_table.fmr_mtt_buddy = &dev->mr_table.mtt_buddy;
/* FMR table is always the first, take reserved MTTs out of there */
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