From 8bfafde08693cc2e740134c3e32b40254f5d82ae Mon Sep 17 00:00:00 2001 From: Yishai Hadas Date: Wed, 30 Sep 2020 19:38:26 +0300 Subject: [PATCH] IB/core: Enable ODP sync without faulting Enable ODP sync without faulting, this improves performance by reducing the number of page faults in the system. The gain from this option is that the device page table can be aligned with the presented pages in the CPU page table without causing page faults. As of that, the overhead on data path from hardware point of view to trigger a fault which end-up by calling the driver to bring the pages will be dropped. Link: https://lore.kernel.org/r/20200930163828.1336747-3-leon@kernel.org Signed-off-by: Yishai Hadas Signed-off-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe --- drivers/infiniband/core/umem_odp.c | 35 +++++++++++++++++++++--------- drivers/infiniband/hw/mlx5/odp.c | 2 +- include/rdma/ib_umem_odp.h | 2 +- 3 files changed, 27 insertions(+), 12 deletions(-) diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c index ad3b2ec688e8..323f6cf00682 100644 --- a/drivers/infiniband/core/umem_odp.c +++ b/drivers/infiniband/core/umem_odp.c @@ -347,9 +347,10 @@ static int ib_umem_odp_map_dma_single_page( * the return value. * @access_mask: bit mask of the requested access permissions for the given * range. + * @fault: is faulting required for the given range */ int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *umem_odp, u64 user_virt, - u64 bcnt, u64 access_mask) + u64 bcnt, u64 access_mask, bool fault) __acquires(&umem_odp->umem_mutex) { struct task_struct *owning_process = NULL; @@ -385,10 +386,12 @@ int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *umem_odp, u64 user_virt, range.end = ALIGN(user_virt + bcnt, 1UL << page_shift); pfn_start_idx = (range.start - ib_umem_start(umem_odp)) >> PAGE_SHIFT; num_pfns = (range.end - range.start) >> PAGE_SHIFT; - range.default_flags = HMM_PFN_REQ_FAULT; + if (fault) { + range.default_flags = HMM_PFN_REQ_FAULT; - if (access_mask & ODP_WRITE_ALLOWED_BIT) - range.default_flags |= HMM_PFN_REQ_WRITE; + if (access_mask & ODP_WRITE_ALLOWED_BIT) + range.default_flags |= HMM_PFN_REQ_WRITE; + } range.hmm_pfns = &(umem_odp->pfn_list[pfn_start_idx]); timeout = jiffies + msecs_to_jiffies(HMM_RANGE_DEFAULT_TIMEOUT); @@ -417,12 +420,24 @@ retry: for (pfn_index = 0; pfn_index < num_pfns; pfn_index += 1 << (page_shift - PAGE_SHIFT), dma_index++) { - /* - * Since we asked for hmm_range_fault() to populate pages, - * it shouldn't return an error entry on success. - */ - WARN_ON(range.hmm_pfns[pfn_index] & HMM_PFN_ERROR); - WARN_ON(!(range.hmm_pfns[pfn_index] & HMM_PFN_VALID)); + + if (fault) { + /* + * Since we asked for hmm_range_fault() to populate + * pages it shouldn't return an error entry on success. + */ + WARN_ON(range.hmm_pfns[pfn_index] & HMM_PFN_ERROR); + WARN_ON(!(range.hmm_pfns[pfn_index] & HMM_PFN_VALID)); + } else { + if (!(range.hmm_pfns[pfn_index] & HMM_PFN_VALID)) { + WARN_ON(umem_odp->dma_list[dma_index]); + continue; + } + access_mask = ODP_READ_ALLOWED_BIT; + if (range.hmm_pfns[pfn_index] & HMM_PFN_WRITE) + access_mask |= ODP_WRITE_ALLOWED_BIT; + } + hmm_order = hmm_pfn_to_map_order(range.hmm_pfns[pfn_index]); /* If a hugepage was detected and ODP wasn't set for, the umem * page_shift will be used, the opposite case is an error. diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c index cca9e85b2ea4..4743ef78afe0 100644 --- a/drivers/infiniband/hw/mlx5/odp.c +++ b/drivers/infiniband/hw/mlx5/odp.c @@ -681,7 +681,7 @@ static int pagefault_real_mr(struct mlx5_ib_mr *mr, struct ib_umem_odp *odp, if (odp->umem.writable && !downgrade) access_mask |= ODP_WRITE_ALLOWED_BIT; - np = ib_umem_odp_map_dma_and_lock(odp, user_va, bcnt, access_mask); + np = ib_umem_odp_map_dma_and_lock(odp, user_va, bcnt, access_mask, true); if (np < 0) return np; diff --git a/include/rdma/ib_umem_odp.h b/include/rdma/ib_umem_odp.h index a53b62ac8a9d..0844c1d05ac6 100644 --- a/include/rdma/ib_umem_odp.h +++ b/include/rdma/ib_umem_odp.h @@ -94,7 +94,7 @@ ib_umem_odp_alloc_child(struct ib_umem_odp *root_umem, unsigned long addr, void ib_umem_odp_release(struct ib_umem_odp *umem_odp); int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *umem_odp, u64 start_offset, - u64 bcnt, u64 access_mask); + u64 bcnt, u64 access_mask, bool fault); void ib_umem_odp_unmap_dma_pages(struct ib_umem_odp *umem_odp, u64 start_offset, u64 bound);