From patchwork Sun Oct 27 14:21:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leon Romanovsky X-Patchwork-Id: 13852567 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0E39FD13562 for ; Sun, 27 Oct 2024 14:22:37 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 8F7E68D0002; Sun, 27 Oct 2024 10:22:36 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8A6498D0001; Sun, 27 Oct 2024 10:22:36 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6D2FF8D0002; Sun, 27 Oct 2024 10:22:36 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 426128D0001 for ; Sun, 27 Oct 2024 10:22:36 -0400 (EDT) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 48823121B85 for ; Sun, 27 Oct 2024 14:22:16 +0000 (UTC) X-FDA: 82719597660.14.25FE70A Received: from nyc.source.kernel.org (nyc.source.kernel.org [147.75.193.91]) by imf08.hostedemail.com (Postfix) with ESMTP id 6DB5416001F for ; Sun, 27 Oct 2024 14:22:19 +0000 (UTC) Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=p469KH+i; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf08.hostedemail.com: domain of leon@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=leon@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1730038781; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=PhW4VjnvtzkDooyFGath+3T4tsAPk9cdglqFB5sUC1Q=; b=BlJnhrfeCSaJ1qsN9qLdwqgkXlU/c/aLcyWqS2eLMIwzbwpEZpj4xyJFygr852sxZ4AHcO FTPdzHuGMnKExlBnAVCBvNSwfPm/fytt25FTGyL1jSYQ20yTH1D6SI4NrRDpGkBsBBnat9 i1k8Ig7GzGfeJwbKyzKHpqplgH8qyNM= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1730038781; a=rsa-sha256; cv=none; b=fDHxoSiG/SvaGVysvS13G7zKFttUrqVmPClHCnkO9g3XIhOHxnyIOncFpO4B696638rtf5 OvWLvwhBhqnTL3yodBb7o4yqWpioNVIqpSwr4mcM3wYnsi1/Phd1Zg7CBdDESx4RIJ9NUc 6G65neFM6rC0uY2dv7PApTy2HN8CfLc= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=p469KH+i; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf08.hostedemail.com: domain of leon@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=leon@kernel.org Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 00CB0A40FA4; Sun, 27 Oct 2024 14:20:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0792FC4CEC3; Sun, 27 Oct 2024 14:22:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730038952; bh=RCW7z84/26BITUxg8PndrrKsB8pTf34fxPy1qnPVTz8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=p469KH+iYKJpE42ausBaBh8WvcfCIuLRW+/Ozj9WyaS1awuuaSGbTYgDOqftciJYn tYLopKnnfSl5vD/Zx8A/kVhx2smNtfxLcxnKp0YBwvo6isKlJPBvKOEANH8xHWPI3u BEwvOeSuvNFGcEAVRwCURH5KJVNClvtUfMssTSQ81yaWUw0XSyZEmG6HBxA3vb+VnI fYsuqFi8i9W/SUik2wC7KbpMDsjkC3EQKlW+wpTMkwZgDyky1gesPtr4uLlpQaqpES beis3VfX/oGZC3vRYVyuC3mPz868lFfuTz1MEcaVLULeCwdQXwWk74JMotfSEdoy7x etTNqb1MXlY7Q== From: Leon Romanovsky To: Jens Axboe , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Christoph Hellwig , Sagi Grimberg Cc: Leon Romanovsky , Keith Busch , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , Marek Szyprowski , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Andrew Morton , Jonathan Corbet , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@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: [PATCH 16/18] vfio/mlx5: Rewrite create mkey flow to allow better code reuse Date: Sun, 27 Oct 2024 16:21:16 +0200 Message-ID: <3b0710f67d75daecc15529307de11d01da45f52c.1730037276.git.leon@kernel.org> X-Mailer: git-send-email 2.46.2 In-Reply-To: References: MIME-Version: 1.0 X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 6DB5416001F X-Stat-Signature: qjz9g6h8c8ziab6fhj6btwgg8a9qotdb X-Rspam-User: X-HE-Tag: 1730038939-733075 X-HE-Meta: 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 jEYIzCTR unU1ecXKNhXyfFEdxeFv1g1zjon5ff+5gHBzk/RHo435EPeCQZ2eyyd8N3144szA/qsgn2Y5k3sxQBcsN8F+zSXEyNiZuykRuWEFB6TdZfPAEceVQnjnqzLkRycD3Y11/7vwF1k8iYZRi8mWJJOc+UlCmsdZAaXZHFycCsgIuKH2wdN1N2JwTZUJs8vPl6HSLGgRcKqZu2BRnN2vImJRuPvqqtIcYYLfdPqe+k43f9eBuuc0= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Leon Romanovsky Change the creation of mkey to be performed in multiple steps: data allocation, DMA setup and actual call to HW to create that mkey. In this new flow, the whole input to MKEY command is saved to eliminate the need to keep array of pointers for DMA addresses for receive list and in the future patches for send list too. In addition to memory size reduce and elimination of unnecessary data movements to set MKEY input, the code is prepared for future reuse. Signed-off-by: Leon Romanovsky --- drivers/vfio/pci/mlx5/cmd.c | 156 ++++++++++++++++++++---------------- drivers/vfio/pci/mlx5/cmd.h | 4 +- 2 files changed, 90 insertions(+), 70 deletions(-) diff --git a/drivers/vfio/pci/mlx5/cmd.c b/drivers/vfio/pci/mlx5/cmd.c index fdc3e515741f..1832a6c1f35d 100644 --- a/drivers/vfio/pci/mlx5/cmd.c +++ b/drivers/vfio/pci/mlx5/cmd.c @@ -313,39 +313,21 @@ static int mlx5vf_cmd_get_vhca_id(struct mlx5_core_dev *mdev, u16 function_id, return ret; } -static int _create_mkey(struct mlx5_core_dev *mdev, u32 pdn, - struct mlx5_vhca_data_buffer *buf, - struct mlx5_vhca_recv_buf *recv_buf, - u32 *mkey) +static u32 *alloc_mkey_in(u32 npages, u32 pdn) { - size_t npages = buf ? buf->npages : recv_buf->npages; - int err = 0, inlen; - __be64 *mtt; + int inlen; void *mkc; u32 *in; inlen = MLX5_ST_SZ_BYTES(create_mkey_in) + - sizeof(*mtt) * round_up(npages, 2); + sizeof(__be64) * round_up(npages, 2); - in = kvzalloc(inlen, GFP_KERNEL); + in = kvzalloc(inlen, GFP_KERNEL_ACCOUNT); if (!in) - return -ENOMEM; + return NULL; MLX5_SET(create_mkey_in, in, translations_octword_actual_size, DIV_ROUND_UP(npages, 2)); - mtt = (__be64 *)MLX5_ADDR_OF(create_mkey_in, in, klm_pas_mtt); - - if (buf) { - struct sg_dma_page_iter dma_iter; - - for_each_sgtable_dma_page(&buf->table.sgt, &dma_iter, 0) - *mtt++ = cpu_to_be64(sg_page_iter_dma_address(&dma_iter)); - } else { - int i; - - for (i = 0; i < npages; i++) - *mtt++ = cpu_to_be64(recv_buf->dma_addrs[i]); - } mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry); MLX5_SET(mkc, mkc, access_mode_1_0, MLX5_MKC_ACCESS_MODE_MTT); @@ -359,9 +341,29 @@ static int _create_mkey(struct mlx5_core_dev *mdev, u32 pdn, MLX5_SET(mkc, mkc, log_page_size, PAGE_SHIFT); MLX5_SET(mkc, mkc, translations_octword_size, DIV_ROUND_UP(npages, 2)); MLX5_SET64(mkc, mkc, len, npages * PAGE_SIZE); - err = mlx5_core_create_mkey(mdev, mkey, in, inlen); - kvfree(in); - return err; + + return in; +} + +static int create_mkey(struct mlx5_core_dev *mdev, u32 npages, + struct mlx5_vhca_data_buffer *buf, u32 *mkey_in, + u32 *mkey) +{ + __be64 *mtt; + int inlen; + + mtt = (__be64 *)MLX5_ADDR_OF(create_mkey_in, mkey_in, klm_pas_mtt); + if (buf) { + struct sg_dma_page_iter dma_iter; + + for_each_sgtable_dma_page(&buf->table.sgt, &dma_iter, 0) + *mtt++ = cpu_to_be64(sg_page_iter_dma_address(&dma_iter)); + } + + inlen = MLX5_ST_SZ_BYTES(create_mkey_in) + + sizeof(__be64) * round_up(npages, 2); + + return mlx5_core_create_mkey(mdev, mkey, mkey_in, inlen); } static int mlx5vf_dma_data_buffer(struct mlx5_vhca_data_buffer *buf) @@ -374,20 +376,28 @@ static int mlx5vf_dma_data_buffer(struct mlx5_vhca_data_buffer *buf) if (mvdev->mdev_detach) return -ENOTCONN; - if (buf->dmaed || !buf->npages) + if (buf->mkey_in || !buf->npages) return -EINVAL; ret = dma_map_sgtable(mdev->device, &buf->table.sgt, buf->dma_dir, 0); if (ret) return ret; - ret = _create_mkey(mdev, buf->migf->pdn, buf, NULL, &buf->mkey); - if (ret) + buf->mkey_in = alloc_mkey_in(buf->npages, buf->migf->pdn); + if (!buf->mkey_in) { + ret = -ENOMEM; goto err; + } - buf->dmaed = true; + ret = create_mkey(mdev, buf->npages, buf, buf->mkey_in, &buf->mkey); + if (ret) + goto err_create_mkey; return 0; + +err_create_mkey: + kvfree(buf->mkey_in); + buf->mkey_in = NULL; err: dma_unmap_sgtable(mdev->device, &buf->table.sgt, buf->dma_dir, 0); return ret; @@ -401,8 +411,9 @@ void mlx5vf_free_data_buffer(struct mlx5_vhca_data_buffer *buf) lockdep_assert_held(&migf->mvdev->state_mutex); WARN_ON(migf->mvdev->mdev_detach); - if (buf->dmaed) { + if (buf->mkey_in) { mlx5_core_destroy_mkey(migf->mvdev->mdev, buf->mkey); + kvfree(buf->mkey_in); dma_unmap_sgtable(migf->mvdev->mdev->device, &buf->table.sgt, buf->dma_dir, 0); } @@ -779,7 +790,7 @@ int mlx5vf_cmd_load_vhca_state(struct mlx5vf_pci_core_device *mvdev, if (mvdev->mdev_detach) return -ENOTCONN; - if (!buf->dmaed) { + if (!buf->mkey_in) { err = mlx5vf_dma_data_buffer(buf); if (err) return err; @@ -1380,56 +1391,54 @@ static int alloc_recv_pages(struct mlx5_vhca_recv_buf *recv_buf, kvfree(recv_buf->page_list); return -ENOMEM; } +static void unregister_dma_pages(struct mlx5_core_dev *mdev, u32 npages, + u32 *mkey_in) +{ + dma_addr_t addr; + __be64 *mtt; + int i; + + mtt = (__be64 *)MLX5_ADDR_OF(create_mkey_in, mkey_in, klm_pas_mtt); + for (i = npages - 1; i >= 0; i--) { + addr = be64_to_cpu(mtt[i]); + dma_unmap_single(mdev->device, addr, PAGE_SIZE, + DMA_FROM_DEVICE); + } +} -static int register_dma_recv_pages(struct mlx5_core_dev *mdev, - struct mlx5_vhca_recv_buf *recv_buf) +static int register_dma_pages(struct mlx5_core_dev *mdev, u32 npages, + struct page **page_list, u32 *mkey_in) { - int i, j; + dma_addr_t addr; + __be64 *mtt; + int i; - recv_buf->dma_addrs = kvcalloc(recv_buf->npages, - sizeof(*recv_buf->dma_addrs), - GFP_KERNEL_ACCOUNT); - if (!recv_buf->dma_addrs) - return -ENOMEM; + mtt = (__be64 *)MLX5_ADDR_OF(create_mkey_in, mkey_in, klm_pas_mtt); - for (i = 0; i < recv_buf->npages; i++) { - recv_buf->dma_addrs[i] = dma_map_page(mdev->device, - recv_buf->page_list[i], - 0, PAGE_SIZE, - DMA_FROM_DEVICE); - if (dma_mapping_error(mdev->device, recv_buf->dma_addrs[i])) + for (i = 0; i < npages; i++) { + addr = dma_map_page(mdev->device, page_list[i], 0, PAGE_SIZE, + DMA_FROM_DEVICE); + if (dma_mapping_error(mdev->device, addr)) goto error; + + *mtt++ = cpu_to_be64(addr); } + return 0; error: - for (j = 0; j < i; j++) - dma_unmap_single(mdev->device, recv_buf->dma_addrs[j], - PAGE_SIZE, DMA_FROM_DEVICE); - - kvfree(recv_buf->dma_addrs); + unregister_dma_pages(mdev, i, mkey_in); return -ENOMEM; } -static void unregister_dma_recv_pages(struct mlx5_core_dev *mdev, - struct mlx5_vhca_recv_buf *recv_buf) -{ - int i; - - for (i = 0; i < recv_buf->npages; i++) - dma_unmap_single(mdev->device, recv_buf->dma_addrs[i], - PAGE_SIZE, DMA_FROM_DEVICE); - - kvfree(recv_buf->dma_addrs); -} - static void mlx5vf_free_qp_recv_resources(struct mlx5_core_dev *mdev, struct mlx5_vhca_qp *qp) { struct mlx5_vhca_recv_buf *recv_buf = &qp->recv_buf; mlx5_core_destroy_mkey(mdev, recv_buf->mkey); - unregister_dma_recv_pages(mdev, recv_buf); + unregister_dma_pages(mdev, recv_buf->npages, recv_buf->mkey_in); + kvfree(recv_buf->mkey_in); free_recv_pages(&qp->recv_buf); } @@ -1445,18 +1454,29 @@ static int mlx5vf_alloc_qp_recv_resources(struct mlx5_core_dev *mdev, if (err < 0) return err; - err = register_dma_recv_pages(mdev, recv_buf); - if (err) + recv_buf->mkey_in = alloc_mkey_in(npages, pdn); + if (!recv_buf->mkey_in) { + err = -ENOMEM; goto end; + } + + err = register_dma_pages(mdev, npages, recv_buf->page_list, + recv_buf->mkey_in); + if (err) + goto err_register_dma; - err = _create_mkey(mdev, pdn, NULL, recv_buf, &recv_buf->mkey); + err = create_mkey(mdev, npages, NULL, recv_buf->mkey_in, + &recv_buf->mkey); if (err) goto err_create_mkey; return 0; err_create_mkey: - unregister_dma_recv_pages(mdev, recv_buf); + unregister_dma_pages(mdev, npages, recv_buf->mkey_in); +err_register_dma: + kvfree(recv_buf->mkey_in); + recv_buf->mkey_in = NULL; end: free_recv_pages(recv_buf); return err; diff --git a/drivers/vfio/pci/mlx5/cmd.h b/drivers/vfio/pci/mlx5/cmd.h index 7d4a833b6900..25dd6ff54591 100644 --- a/drivers/vfio/pci/mlx5/cmd.h +++ b/drivers/vfio/pci/mlx5/cmd.h @@ -58,8 +58,8 @@ struct mlx5_vhca_data_buffer { u64 length; u32 npages; u32 mkey; + u32 *mkey_in; enum dma_data_direction dma_dir; - u8 dmaed:1; u8 stop_copy_chunk_num; struct list_head buf_elm; struct mlx5_vf_migration_file *migf; @@ -133,8 +133,8 @@ struct mlx5_vhca_cq { struct mlx5_vhca_recv_buf { u32 npages; struct page **page_list; - dma_addr_t *dma_addrs; u32 next_rq_offset; + u32 *mkey_in; u32 mkey; };