From: Michael Guralnik <michaelgur@xxxxxxxxxxxx>
For memory regions registered with IB_ACCESS_RELAXED_ORDERING will be
dma mapped with the DMA_ATTR_WEAK_ORDERING.
This will allow reads and writes to the mapping to be weakly ordered,
such change can enhance performance on some supporting architectures.
Signed-off-by: Michael Guralnik <michaelgur@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
drivers/infiniband/core/umem.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index 06b6125b5ae1..82455a1392f1 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -197,6 +197,7 @@ struct ib_umem *ib_umem_get(struct ib_device *device, unsigned long addr,
unsigned long lock_limit;
unsigned long new_pinned;
unsigned long cur_base;
+ unsigned long dma_attr = 0;
struct mm_struct *mm;
unsigned long npages;
int ret;
@@ -278,10 +279,12 @@ struct ib_umem *ib_umem_get(struct ib_device *device, unsigned long addr,
sg_mark_end(sg);
- umem->nmap = ib_dma_map_sg(device,
- umem->sg_head.sgl,
- umem->sg_nents,
- DMA_BIDIRECTIONAL);
+ if (access & IB_ACCESS_RELAXED_ORDERING)
+ dma_attr |= DMA_ATTR_WEAK_ORDERING;
+
+ umem->nmap =
+ ib_dma_map_sg_attrs(device, umem->sg_head.sgl, umem->sg_nents,
+ DMA_BIDIRECTIONAL, dma_attr);
if (!umem->nmap) {
ret = -ENOMEM;
--
2.24.1
