From patchwork Tue Jul 2 09:09:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leon Romanovsky X-Patchwork-Id: 13719193 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ADC97155325; Tue, 2 Jul 2024 09:10:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719911437; cv=none; b=uxnUJdmUE5ZD9FEJxRpKFOg2h3rMmTaevwvE/O3M0Z0PjaLQXQHkLoQIPQDJpS0hMpt7xY2TUYX3cmdbLRKd6sd3br002XDYJWzdZ4Bi3kJx7pN7Vwz0lxhIPdPIDMR1sg6xIW95Himv15319ufn98dPyom6Ezq8zm5Ly2eCNec= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719911437; c=relaxed/simple; bh=UccJQ9nS+AS0vpHIOQiIlzi89+lcmxz/okxY3l4iYQ8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VTyTfrmw/5sTExgyFr9Llzn8Box+ynOwUGBy4H43PfdlniD01ZtKV9BbGMgDjZ/43XKderclY7+f0gL/LJyqO8oErt8lOR8xCdMslTtqNZbnIAlCdoO+MgwCunGPeH9/idXkrTnh/8jLWjztjkGHuA5s9FFVLtaNnXJjl/XDjcU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=iNhBksVu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="iNhBksVu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C3CCCC116B1; Tue, 2 Jul 2024 09:10:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719911437; bh=UccJQ9nS+AS0vpHIOQiIlzi89+lcmxz/okxY3l4iYQ8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iNhBksVuMjdd9OgE12zpQ/G/0gXROuc2JiQtdkq/YPji7n6elUfWNHPpjzLSkzwpD rYUQOCs17v6ZkaTLonG9Qm2hIKwxebLAoNnvhf5uX0T5kMW55FAtOwHN1U58yzjg5H KmCEktqyhOcnCdt2e+XYEsVRIapgAdwwTd3WfQSE5X050+CWU82gphnSKNpW3gg9Yj ZT0bXPA9TCvLuXGiFdBiGVLaWvdhZ6EExdZ0nFexFeg8QlaSTJEauVpUoRW/POrhmm lFbNK4ciqFxYeGoW/fyYyyOismRIotZnY2twO4F1++hPCQz9/9/ERwuYQmgecOSPzd 6W0gz8DC0fy+A== From: Leon Romanovsky To: Jens Axboe , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Keith Busch , Christoph Hellwig , "Zeng, Oak" , Chaitanya Kulkarni Cc: Leon Romanovsky , Sagi Grimberg , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , Marek Szyprowski , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Andrew Morton , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v1 10/18] RDMA/umem: Store ODP access mask information in PFN Date: Tue, 2 Jul 2024 12:09:40 +0300 Message-ID: X-Mailer: git-send-email 2.45.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Leon Romanovsky As a preparation to remove of dma_list, store access mask in PFN pointer and not in dma_addr_t. Signed-off-by: Leon Romanovsky --- drivers/infiniband/core/umem_odp.c | 98 +++++++++++----------------- drivers/infiniband/hw/mlx5/mlx5_ib.h | 1 + drivers/infiniband/hw/mlx5/odp.c | 37 ++++++----- include/rdma/ib_umem_odp.h | 14 +--- 4 files changed, 59 insertions(+), 91 deletions(-) diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c index 955bf338b1bf..c628a98c41b7 100644 --- a/drivers/infiniband/core/umem_odp.c +++ b/drivers/infiniband/core/umem_odp.c @@ -308,22 +308,11 @@ EXPORT_SYMBOL(ib_umem_odp_release); static int ib_umem_odp_map_dma_single_page( struct ib_umem_odp *umem_odp, unsigned int dma_index, - struct page *page, - u64 access_mask) + struct page *page) { struct ib_device *dev = umem_odp->umem.ibdev; dma_addr_t *dma_addr = &umem_odp->dma_list[dma_index]; - if (*dma_addr) { - /* - * If the page is already dma mapped it means it went through - * a non-invalidating trasition, like read-only to writable. - * Resync the flags. - */ - *dma_addr = (*dma_addr & ODP_DMA_ADDR_MASK) | access_mask; - return 0; - } - *dma_addr = ib_dma_map_page(dev, page, 0, 1 << umem_odp->page_shift, DMA_BIDIRECTIONAL); if (ib_dma_mapping_error(dev, *dma_addr)) { @@ -331,7 +320,6 @@ static int ib_umem_odp_map_dma_single_page( return -EFAULT; } umem_odp->npages++; - *dma_addr |= access_mask; return 0; } @@ -367,9 +355,6 @@ int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *umem_odp, u64 user_virt, struct hmm_range range = {}; unsigned long timeout; - if (access_mask == 0) - return -EINVAL; - if (user_virt < ib_umem_start(umem_odp) || user_virt + bcnt > ib_umem_end(umem_odp)) return -EFAULT; @@ -395,7 +380,7 @@ int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *umem_odp, u64 user_virt, if (fault) { range.default_flags = HMM_PFN_REQ_FAULT; - if (access_mask & ODP_WRITE_ALLOWED_BIT) + if (access_mask & HMM_PFN_WRITE) range.default_flags |= HMM_PFN_REQ_WRITE; } @@ -427,22 +412,17 @@ int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *umem_odp, u64 user_virt, for (pfn_index = 0; pfn_index < num_pfns; pfn_index += 1 << (page_shift - PAGE_SHIFT), dma_index++) { - 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; - } + /* + * Since we asked for hmm_range_fault() to populate + * pages it shouldn't return an error entry on success. + */ + WARN_ON(fault && range.hmm_pfns[pfn_index] & HMM_PFN_ERROR); + WARN_ON(fault && !(range.hmm_pfns[pfn_index] & HMM_PFN_VALID)); + if (!(range.hmm_pfns[pfn_index] & HMM_PFN_VALID)) + continue; + + if (range.hmm_pfns[pfn_index] & HMM_PFN_DMA_MAPPED) + continue; 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 @@ -457,13 +437,13 @@ int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *umem_odp, u64 user_virt, } ret = ib_umem_odp_map_dma_single_page( - umem_odp, dma_index, hmm_pfn_to_page(range.hmm_pfns[pfn_index]), - access_mask); + umem_odp, dma_index, hmm_pfn_to_page(range.hmm_pfns[pfn_index])); if (ret < 0) { ibdev_dbg(umem_odp->umem.ibdev, "ib_umem_odp_map_dma_single_page failed with error %d\n", ret); break; } + range.hmm_pfns[pfn_index] |= HMM_PFN_DMA_MAPPED; } /* upon success lock should stay on hold for the callee */ if (!ret) @@ -483,7 +463,6 @@ EXPORT_SYMBOL(ib_umem_odp_map_dma_and_lock); void ib_umem_odp_unmap_dma_pages(struct ib_umem_odp *umem_odp, u64 virt, u64 bound) { - dma_addr_t dma_addr; dma_addr_t dma; int idx; u64 addr; @@ -494,34 +473,33 @@ void ib_umem_odp_unmap_dma_pages(struct ib_umem_odp *umem_odp, u64 virt, virt = max_t(u64, virt, ib_umem_start(umem_odp)); bound = min_t(u64, bound, ib_umem_end(umem_odp)); for (addr = virt; addr < bound; addr += BIT(umem_odp->page_shift)) { + unsigned long pfn_idx = (addr - ib_umem_start(umem_odp)) >> PAGE_SHIFT; + struct page *page = hmm_pfn_to_page(umem_odp->pfn_list[pfn_idx]); + idx = (addr - ib_umem_start(umem_odp)) >> umem_odp->page_shift; dma = umem_odp->dma_list[idx]; - /* The access flags guaranteed a valid DMA address in case was NULL */ - if (dma) { - unsigned long pfn_idx = (addr - ib_umem_start(umem_odp)) >> PAGE_SHIFT; - struct page *page = hmm_pfn_to_page(umem_odp->pfn_list[pfn_idx]); - - dma_addr = dma & ODP_DMA_ADDR_MASK; - ib_dma_unmap_page(dev, dma_addr, - BIT(umem_odp->page_shift), - DMA_BIDIRECTIONAL); - if (dma & ODP_WRITE_ALLOWED_BIT) { - struct page *head_page = compound_head(page); - /* - * set_page_dirty prefers being called with - * the page lock. However, MMU notifiers are - * called sometimes with and sometimes without - * the lock. We rely on the umem_mutex instead - * to prevent other mmu notifiers from - * continuing and allowing the page mapping to - * be removed. - */ - set_page_dirty(head_page); - } - umem_odp->dma_list[idx] = 0; - umem_odp->npages--; + if (!(umem_odp->pfn_list[pfn_idx] & HMM_PFN_VALID)) + continue; + if (!(umem_odp->pfn_list[pfn_idx] & HMM_PFN_DMA_MAPPED)) + continue; + + ib_dma_unmap_page(dev, dma, BIT(umem_odp->page_shift), + DMA_BIDIRECTIONAL); + if (umem_odp->pfn_list[pfn_idx] & HMM_PFN_WRITE) { + struct page *head_page = compound_head(page); + /* + * set_page_dirty prefers being called with + * the page lock. However, MMU notifiers are + * called sometimes with and sometimes without + * the lock. We rely on the umem_mutex instead + * to prevent other mmu notifiers from + * continuing and allowing the page mapping to + * be removed. + */ + set_page_dirty(head_page); } + umem_odp->npages--; } } EXPORT_SYMBOL(ib_umem_odp_unmap_dma_pages); diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h index f255a12e26a0..e8494a803a58 100644 --- a/drivers/infiniband/hw/mlx5/mlx5_ib.h +++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h @@ -334,6 +334,7 @@ struct mlx5_ib_flow_db { #define MLX5_IB_UPD_XLT_PD BIT(4) #define MLX5_IB_UPD_XLT_ACCESS BIT(5) #define MLX5_IB_UPD_XLT_INDIRECT BIT(6) +#define MLX5_IB_UPD_XLT_DOWNGRADE BIT(7) /* Private QP creation flags to be passed in ib_qp_init_attr.create_flags. * diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c index 4a04cbc5b78a..5713fe25f4de 100644 --- a/drivers/infiniband/hw/mlx5/odp.c +++ b/drivers/infiniband/hw/mlx5/odp.c @@ -34,6 +34,7 @@ #include #include #include +#include #include "mlx5_ib.h" #include "cmd.h" @@ -143,22 +144,12 @@ static void populate_klm(struct mlx5_klm *pklm, size_t idx, size_t nentries, } } -static u64 umem_dma_to_mtt(dma_addr_t umem_dma) -{ - u64 mtt_entry = umem_dma & ODP_DMA_ADDR_MASK; - - if (umem_dma & ODP_READ_ALLOWED_BIT) - mtt_entry |= MLX5_IB_MTT_READ; - if (umem_dma & ODP_WRITE_ALLOWED_BIT) - mtt_entry |= MLX5_IB_MTT_WRITE; - - return mtt_entry; -} - static void populate_mtt(__be64 *pas, size_t idx, size_t nentries, struct mlx5_ib_mr *mr, int flags) { struct ib_umem_odp *odp = to_ib_umem_odp(mr->umem); + bool downgrade = flags & MLX5_IB_UPD_XLT_DOWNGRADE; + unsigned long pfn; dma_addr_t pa; size_t i; @@ -166,8 +157,17 @@ static void populate_mtt(__be64 *pas, size_t idx, size_t nentries, return; for (i = 0; i < nentries; i++) { + pfn = odp->pfn_list[idx + i]; + if (!(pfn & HMM_PFN_VALID)) + /* Initial ODP init */ + continue; + pa = odp->dma_list[idx + i]; - pas[i] = cpu_to_be64(umem_dma_to_mtt(pa)); + pa |= MLX5_IB_MTT_READ; + if ((pfn & HMM_PFN_WRITE) && !downgrade) + pa |= MLX5_IB_MTT_WRITE; + + pas[i] = cpu_to_be64(pa); } } @@ -268,8 +268,7 @@ static bool mlx5_ib_invalidate_range(struct mmu_interval_notifier *mni, * estimate the cost of another UMR vs. the cost of bigger * UMR. */ - if (umem_odp->dma_list[idx] & - (ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT)) { + if (umem_odp->pfn_list[idx] & HMM_PFN_VALID) { if (!in_block) { blk_start_idx = idx; in_block = 1; @@ -555,7 +554,7 @@ static int pagefault_real_mr(struct mlx5_ib_mr *mr, struct ib_umem_odp *odp, { int page_shift, ret, np; bool downgrade = flags & MLX5_PF_FLAGS_DOWNGRADE; - u64 access_mask; + u64 access_mask = 0; u64 start_idx; bool fault = !(flags & MLX5_PF_FLAGS_SNAPSHOT); u32 xlt_flags = MLX5_IB_UPD_XLT_ATOMIC; @@ -563,12 +562,14 @@ static int pagefault_real_mr(struct mlx5_ib_mr *mr, struct ib_umem_odp *odp, if (flags & MLX5_PF_FLAGS_ENABLE) xlt_flags |= MLX5_IB_UPD_XLT_ENABLE; + if (flags & MLX5_PF_FLAGS_DOWNGRADE) + xlt_flags |= MLX5_IB_UPD_XLT_DOWNGRADE; + page_shift = odp->page_shift; start_idx = (user_va - ib_umem_start(odp)) >> page_shift; - access_mask = ODP_READ_ALLOWED_BIT; if (odp->umem.writable && !downgrade) - access_mask |= ODP_WRITE_ALLOWED_BIT; + access_mask |= HMM_PFN_WRITE; np = ib_umem_odp_map_dma_and_lock(odp, user_va, bcnt, access_mask, fault); if (np < 0) diff --git a/include/rdma/ib_umem_odp.h b/include/rdma/ib_umem_odp.h index bb2d7f2a5b04..a3f4a5c03bf8 100644 --- a/include/rdma/ib_umem_odp.h +++ b/include/rdma/ib_umem_odp.h @@ -8,6 +8,7 @@ #include #include +#include struct ib_umem_odp { struct ib_umem umem; @@ -68,19 +69,6 @@ static inline size_t ib_umem_odp_num_pages(struct ib_umem_odp *umem_odp) umem_odp->page_shift; } -/* - * The lower 2 bits of the DMA address signal the R/W permissions for - * the entry. To upgrade the permissions, provide the appropriate - * bitmask to the map_dma_pages function. - * - * Be aware that upgrading a mapped address might result in change of - * the DMA address for the page. - */ -#define ODP_READ_ALLOWED_BIT (1<<0ULL) -#define ODP_WRITE_ALLOWED_BIT (1<<1ULL) - -#define ODP_DMA_ADDR_MASK (~(ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT)) - #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING struct ib_umem_odp *