> -----Original Message-----
> From: Leon Romanovsky <l...@kernel.org>
> Sent: Tuesday, December 08, 2020 10:45 PM
> To: Xiong, Jianxin <jianxin.xi...@intel.com>
> Cc: linux-r...@vger.kernel.org; dri-devel@lists.freedesktop.org; Doug Ledford
> <dledf...@redhat.com>; Jason Gunthorpe <j...@ziepe.ca>;
> Sumit Semwal <sumit.sem...@linaro.org>; Christian Koenig
> <christian.koe...@amd.com>; Vetter, Daniel <daniel.vet...@intel.com>
> Subject: Re: [PATCH v14 4/4] RDMA/mlx5: Support dma-buf based userspace
> memory region
>
> On Tue, Dec 08, 2020 at 02:39:15PM -0800, Jianxin Xiong wrote:
> > Implement the new driver method 'reg_user_mr_dmabuf'. Utilize the
> > core functions to import dma-buf based memory region and update the
> > mappings.
> >
> > Add code to handle dma-buf related page fault.
> >
> > Signed-off-by: Jianxin Xiong <jianxin.xi...@intel.com>
> > Reviewed-by: Sean Hefty <sean.he...@intel.com>
> > Acked-by: Michael J. Ruhl <michael.j.r...@intel.com>
> > Acked-by: Christian Koenig <christian.koe...@amd.com>
> > Acked-by: Daniel Vetter <daniel.vet...@ffwll.ch>
> > ---
> > drivers/infiniband/hw/mlx5/main.c | 2 +
> > drivers/infiniband/hw/mlx5/mlx5_ib.h | 18 +++++
> > drivers/infiniband/hw/mlx5/mr.c | 128
> > +++++++++++++++++++++++++++++++++--
> > drivers/infiniband/hw/mlx5/odp.c | 86 +++++++++++++++++++++--
> > 4 files changed, 225 insertions(+), 9 deletions(-)
>
> <...>
>
> >
> > +
> > + umem = ib_umem_dmabuf_get(&dev->ib_dev, offset, length, fd,
> > access_flags,
> > + &mlx5_ib_dmabuf_attach_ops);
> > + if (IS_ERR(umem)) {
> > + mlx5_ib_dbg(dev, "umem get failed (%ld)\n", PTR_ERR(umem));
> > + return ERR_PTR(PTR_ERR(umem));
>
> return ERR_CAST(umem);
>
> > + }
>
> <...>
>
> > + dma_resv_lock(umem_dmabuf->attach->dmabuf->resv, NULL);
> > + err = ib_umem_dmabuf_map_pages(umem_dmabuf);
> > + if (!err) {
> > + page_size = mlx5_umem_find_best_pgsz(&umem_dmabuf->umem, mkc,
> > + log_page_size, 0,
> > + umem_dmabuf->umem.iova);
> > + if (unlikely(page_size < PAGE_SIZE)) {
> > + ib_umem_dmabuf_unmap_pages(umem_dmabuf);
> > + err = -EINVAL;
> > + } else {
> > + err = mlx5_ib_update_mr_pas(mr, xlt_flags);
> > + }
> > + }
> > + dma_resv_unlock(umem_dmabuf->attach->dmabuf->resv);
>
> Let's write this section in kernel coding style, please
>
> dma_resv_lock(umem_dmabuf->attach->dmabuf->resv, NULL); err =
> ib_umem_dmabuf_map_pages(umem_dmabuf);
> if (err) {
> dma_resv_unlock(umem_dmabuf->attach->dmabuf->resv);
> return err;
> }
> .....
>
Thanks a lot. Will fix these.
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