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| author | Michael Guralnik <michaelgur@mellanox.com> | 2020-02-12 09:35:59 +0200 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2020-02-13 13:38:02 -0400 |
| commit | f03d9fadfe13a78ee28fec320d43f7b37574adcb (patch) | |
| tree | 93e35fb818ea3843ba89a9bbec7bb68e0e85bff8 | |
| parent | ca750d4a9c426854e221ca404fbefeab9800134e (diff) | |
| download | linux-stable-f03d9fadfe13a78ee28fec320d43f7b37574adcb.tar.gz linux-stable-f03d9fadfe13a78ee28fec320d43f7b37574adcb.tar.bz2 linux-stable-f03d9fadfe13a78ee28fec320d43f7b37574adcb.zip | |
RDMA/core: Add weak ordering dma attr to dma mapping
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.
Link: https://lore.kernel.org/r/20200212073559.684139-1-leon@kernel.org
Signed-off-by: Michael Guralnik <michaelgur@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
| -rw-r--r-- | drivers/infiniband/core/umem.c | 11 |
1 files 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; |