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RDMA/umem: Use consistent DMA attributes when unmapping entries 

The DMA API expects that mapping and unmapping use the same DMA
attributes. The RDMA umem code did not meet this requirement, so fix
the mismatch.

Fixes: f03d9fadfe ("RDMA/core: Add weak ordering dma attr to dma mapping")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
master
Leon Romanovsky 2026-03-23 22:10:18 +02:00 committed by Leon Romanovsky
parent e6fd249178
commit 179b320958
2 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/infiniband/core/umem.c
View File

@ -55,8 +55,7 @@ static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int d
if (dirty)
ib_dma_unmap_sgtable_attrs(dev, &umem->sgt_append.sgt,
DMA_BIDIRECTIONAL,
DMA_ATTR_REQUIRE_COHERENT);
DMA_BIDIRECTIONAL, umem->dma_attrs);
for_each_sgtable_sg(&umem->sgt_append.sgt, sg, i) {
unpin_user_page_range_dirty_lock(sg_page(sg),
@ -170,7 +169,6 @@ 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 = DMA_ATTR_REQUIRE_COHERENT;
struct mm_struct *mm;
unsigned long npages;
int pinned, ret;
@ -203,6 +201,10 @@ struct ib_umem *ib_umem_get(struct ib_device *device, unsigned long addr,
umem->iova = addr;
umem->writable = ib_access_writable(access);
umem->owning_mm = mm = current->mm;
umem->dma_attrs = DMA_ATTR_REQUIRE_COHERENT;
if (access & IB_ACCESS_RELAXED_ORDERING)
umem->dma_attrs |= DMA_ATTR_WEAK_ORDERING;
mmgrab(mm);
page_list = (struct page **) __get_free_page(GFP_KERNEL);
@ -255,11 +257,8 @@ struct ib_umem *ib_umem_get(struct ib_device *device, unsigned long addr,
}
}
if (access & IB_ACCESS_RELAXED_ORDERING)
dma_attr |= DMA_ATTR_WEAK_ORDERING;
ret = ib_dma_map_sgtable_attrs(device, &umem->sgt_append.sgt,
DMA_BIDIRECTIONAL, dma_attr);
DMA_BIDIRECTIONAL, umem->dma_attrs);
if (ret)
goto umem_release;
goto out;

1
include/rdma/ib_umem.h
View File

@ -18,6 +18,7 @@ struct ib_umem {
u64 iova;
size_t length;
unsigned long address;
unsigned long dma_attrs;
u32 writable : 1;
u32 is_odp : 1;
u32 is_dmabuf : 1;