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| author |   Jason Gunthorpe <jgg@nvidia.com> | 2020-09-04 19:41:47 -0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2020-09-11 10:24:53 -0300 |
| commit | a665aca89a411115e35ea937c2d3fb2ee4f5a701 (patch) | |
| tree | 79c8a3e6ba1b0df6d1cfe1e1067a40b72bc1f942 /drivers/infiniband/hw/cxgb4 | |
| parent | RDMA/umem: Replace for_each_sg_dma_page with rdma_umem_for_each_dma_block (diff) | |
| download | linux-dev-a665aca89a411115e35ea937c2d3fb2ee4f5a701.tar.xz linux-dev-a665aca89a411115e35ea937c2d3fb2ee4f5a701.zip | |
RDMA/umem: Split ib_umem_num_pages() into ib_umem_num_dma_blocks()
ib_umem_num_pages() should only be used by things working with the SGL in
CPU pages directly.
Drivers building DMA lists should use the new ib_num_dma_blocks() which
returns the number of blocks rdma_umem_for_each_block() will return.
To make this general for DMA drivers requires a different implementation.
Computing DMA block count based on umem->address only works if the
requested page size is < PAGE_SIZE and/or the IOVA == umem->address.
Instead the number of DMA pages should be computed in the IOVA address
space, not umem->address. Thus the IOVA has to be stored inside the umem
so it can be used for these calculations.
For now set it to umem->address by default and fix it up if
ib_umem_find_best_pgsz() was called. This allows drivers to be converted
to ib_umem_num_dma_blocks() safely.
Link: https://lore.kernel.org/r/6-v2-270386b7e60b+28f4-umem_1_jgg@nvidia.com
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers/infiniband/hw/cxgb4')
| -rw-r--r-- | drivers/infiniband/hw/cxgb4/mem.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/cxgb4/mem.c b/drivers/infiniband/hw/cxgb4/mem.c index 82afdb1987ef..22c8f5745047 100644 --- a/drivers/infiniband/hw/cxgb4/mem.c +++ b/drivers/infiniband/hw/cxgb4/mem.c @@ -548,7 +548,7 @@ struct ib_mr *c4iw_reg_user_mr(struct ib_pd *pd, u64 start, u64 length, shift = PAGE_SHIFT; - n = ib_umem_num_pages(mhp->umem); + n = ib_umem_num_dma_blocks(mhp->umem, 1 << shift); err = alloc_pbl(mhp, n); if (err) goto err_umem_release; |