From 0a2fd01c28ae490a639a32a52b81fb2df48b92a0 Mon Sep 17 00:00:00 2001 From: Yishai Hadas Date: Tue, 24 Mar 2020 08:01:43 +0200 Subject: [PATCH] IB/mlx5: Move to fully dynamic UAR mode once user space supports it Move to fully dynamic UAR mode once user space supports it. In this case we prevent any legacy mode of UARs on the allocated context and prevent redundant allocation of the static ones. Link: https://lore.kernel.org/r/20200324060143.1569116-6-leon@kernel.org Signed-off-by: Yishai Hadas Reviewed-by: Michael Guralnik Signed-off-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe --- drivers/infiniband/hw/mlx5/cq.c | 8 ++++++-- drivers/infiniband/hw/mlx5/main.c | 13 ++++++++++++- drivers/infiniband/hw/mlx5/mlx5_ib.h | 1 + drivers/infiniband/hw/mlx5/qp.c | 6 ++++++ include/uapi/rdma/mlx5-abi.h | 1 + 5 files changed, 26 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/hw/mlx5/cq.c b/drivers/infiniband/hw/mlx5/cq.c index 1d184bd5c759..f1c7fa561b16 100644 --- a/drivers/infiniband/hw/mlx5/cq.c +++ b/drivers/infiniband/hw/mlx5/cq.c @@ -741,10 +741,14 @@ static int create_cq_user(struct mlx5_ib_dev *dev, struct ib_udata *udata, MLX5_SET(cqc, cqc, log_page_size, page_shift - MLX5_ADAPTER_PAGE_SHIFT); - if (ucmd.flags & MLX5_IB_CREATE_CQ_FLAGS_UAR_PAGE_INDEX) + if (ucmd.flags & MLX5_IB_CREATE_CQ_FLAGS_UAR_PAGE_INDEX) { *index = ucmd.uar_page_index; - else + } else if (context->bfregi.lib_uar_dyn) { + err = -EINVAL; + goto err_cqb; + } else { *index = context->bfregi.sys_pages[0]; + } if (ucmd.cqe_comp_en == 1) { int mini_cqe_format; diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c index 289445f6af21..12273851f2db 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -1786,6 +1786,7 @@ static int mlx5_ib_alloc_ucontext(struct ib_ucontext *uctx, max_cqe_version); u32 dump_fill_mkey; bool lib_uar_4k; + bool lib_uar_dyn; if (!dev->ib_active) return -EAGAIN; @@ -1844,8 +1845,14 @@ static int mlx5_ib_alloc_ucontext(struct ib_ucontext *uctx, } lib_uar_4k = req.lib_caps & MLX5_LIB_CAP_4K_UAR; + lib_uar_dyn = req.lib_caps & MLX5_LIB_CAP_DYN_UAR; bfregi = &context->bfregi; + if (lib_uar_dyn) { + bfregi->lib_uar_dyn = lib_uar_dyn; + goto uar_done; + } + /* updates req->total_num_bfregs */ err = calc_total_bfregs(dev, lib_uar_4k, &req, bfregi); if (err) @@ -1872,6 +1879,7 @@ static int mlx5_ib_alloc_ucontext(struct ib_ucontext *uctx, if (err) goto out_sys_pages; +uar_done: if (req.flags & MLX5_IB_ALLOC_UCTX_DEVX) { err = mlx5_ib_devx_create(dev, true); if (err < 0) @@ -1893,7 +1901,7 @@ static int mlx5_ib_alloc_ucontext(struct ib_ucontext *uctx, INIT_LIST_HEAD(&context->db_page_list); mutex_init(&context->db_page_mutex); - resp.tot_bfregs = req.total_num_bfregs; + resp.tot_bfregs = lib_uar_dyn ? 0 : req.total_num_bfregs; resp.num_ports = dev->num_ports; if (offsetofend(typeof(resp), cqe_version) <= udata->outlen) @@ -2141,6 +2149,9 @@ static int uar_mmap(struct mlx5_ib_dev *dev, enum mlx5_ib_mmap_cmd cmd, int max_valid_idx = dyn_uar ? bfregi->num_sys_pages : bfregi->num_static_sys_pages; + if (bfregi->lib_uar_dyn) + return -EINVAL; + if (vma->vm_end - vma->vm_start != PAGE_SIZE) return -EINVAL; diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h index ae6289133cd8..b88414acb993 100644 --- a/drivers/infiniband/hw/mlx5/mlx5_ib.h +++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h @@ -139,6 +139,7 @@ struct mlx5_bfreg_info { struct mutex lock; u32 ver; u8 lib_uar_4k : 1; + u8 lib_uar_dyn : 1; u32 num_sys_pages; u32 num_static_sys_pages; u32 total_num_bfregs; diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c index b708a0484f77..aa7834d80493 100644 --- a/drivers/infiniband/hw/mlx5/qp.c +++ b/drivers/infiniband/hw/mlx5/qp.c @@ -697,6 +697,9 @@ static int alloc_bfreg(struct mlx5_ib_dev *dev, { int bfregn = -ENOMEM; + if (bfregi->lib_uar_dyn) + return -EINVAL; + mutex_lock(&bfregi->lock); if (bfregi->ver >= 2) { bfregn = alloc_high_class_bfreg(dev, bfregi); @@ -768,6 +771,9 @@ int bfregn_to_uar_index(struct mlx5_ib_dev *dev, u32 index_of_sys_page; u32 offset; + if (bfregi->lib_uar_dyn) + return -EINVAL; + bfregs_per_sys_page = get_uars_per_sys_page(dev, bfregi->lib_uar_4k) * MLX5_NON_FP_BFREGS_PER_UAR; index_of_sys_page = bfregn / bfregs_per_sys_page; diff --git a/include/uapi/rdma/mlx5-abi.h b/include/uapi/rdma/mlx5-abi.h index a65d60b44829..df1cc3641bda 100644 --- a/include/uapi/rdma/mlx5-abi.h +++ b/include/uapi/rdma/mlx5-abi.h @@ -79,6 +79,7 @@ struct mlx5_ib_alloc_ucontext_req { enum mlx5_lib_caps { MLX5_LIB_CAP_4K_UAR = (__u64)1 << 0, + MLX5_LIB_CAP_DYN_UAR = (__u64)1 << 1, }; enum mlx5_ib_alloc_uctx_v2_flags {