From: Michael Guralnik Date: Wed, 12 Feb 2020 07:35:59 +0000 (+0200) Subject: RDMA/core: Add weak ordering dma attr to dma mapping X-Git-Tag: rel_imx_5.10.35_2.0.0-somdevices.0~2515^2~125 X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=f03d9fadfe13a78ee28fec320d43f7b37574adcb;p=linux.git 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 Signed-off-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe --- 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;