diff options
| 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/mlx5 | |
| parent | 89603f7e7e5a6b719f1a163a05bd8a9231b58318 (diff) | |
| download | linux-a665aca89a411115e35ea937c2d3fb2ee4f5a701.tar.gz | |
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/mlx5')
| -rw-r--r-- | drivers/infiniband/hw/mlx5/mem.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/mlx5/mem.c b/drivers/infiniband/hw/mlx5/mem.c index c19ec9fd8a63..13de3d2edd34 100644 --- a/drivers/infiniband/hw/mlx5/mem.c +++ b/drivers/infiniband/hw/mlx5/mem.c @@ -169,8 +169,8 @@ void mlx5_ib_populate_pas(struct mlx5_ib_dev *dev, struct ib_umem *umem, int page_shift, __be64 *pas, int access_flags) { return __mlx5_ib_populate_pas(dev, umem, page_shift, 0, - ib_umem_num_pages(umem), pas, - access_flags); + ib_umem_num_dma_blocks(umem, PAGE_SIZE), + pas, access_flags); } int mlx5_ib_get_buf_offset(u64 addr, int page_shift, u32 *offset) { |