From patchwork Mon Nov 22 11:08:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shunsuke Mie X-Patchwork-Id: 12631673 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6B332C433F5 for ; Mon, 22 Nov 2021 11:08:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236049AbhKVLLn (ORCPT ); Mon, 22 Nov 2021 06:11:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56488 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235587AbhKVLLk (ORCPT ); Mon, 22 Nov 2021 06:11:40 -0500 Received: from mail-pj1-x102d.google.com (mail-pj1-x102d.google.com [IPv6:2607:f8b0:4864:20::102d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4FB5DC061757 for ; Mon, 22 Nov 2021 03:08:33 -0800 (PST) Received: by mail-pj1-x102d.google.com with SMTP id p18-20020a17090ad31200b001a78bb52876so16554772pju.3 for ; Mon, 22 Nov 2021 03:08:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=igel-co-jp.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=r3BsV1GTEqKXRyiYvYJGLvk2Pn1r3f4nsDFd9biBydc=; b=APqXzT+zadmpYq9XewB4Hxtxw2cFZymST7E4a8Ff9UdwuRgpWx9lTe53jJVda6Adu0 KQO96VWw9lOKubLh15GUKl2EWg3hZ4kYQwOeqXIRENbzfM8e/bE4HOEM1vUApRpUmHZX HtuTHt/R+0RwD8/bQ2zy5/TXGRtZzjNxZZKe3mVv5liLwRC3jL1cwRDaJ7e9um/te3wh hlkH1Zm+Zs4lV0jPODxLw0ubCpIV9TDCGAOEjST4TsMv6GOAlX/5fcHMy5O5rBmjNyt8 3UK+axs8zvTmpRSietmqLcjCO1SRGUHaxOpsajyPEGdygQlCX0OkPqgtm43URr7qGsIu qqFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=r3BsV1GTEqKXRyiYvYJGLvk2Pn1r3f4nsDFd9biBydc=; b=xOGVWDvr0qYroKSXHYv0MfmkFgSdvGTcOxh9nUlJVRESVyC5fuKliPvaiMv6q53f9A RFgfiRXvMP2h9Jphwx3g5vNE/bx1IdDDHENLb7nBzUzg6MqOX2ICSSeWcnv9KydLCxrA 46ac85zHWPtQU1+GLxaZytiLt1v/9I0MdGBQEk0fIxyfsD3jz+IoRX1caM1Kf0thDrYn pU/VBg0feIjjvJbSyqw+AywZgp3zLwVTlKhuMVVmGnhKMxSEiQeXYF7rAGKQL+zEz5uz lZIgRNihUe+cp+9XUeinuqdfoujExnflDMmWKqT0998BWJrs1jdYBdEP1X9+1KisUH2D 3Nrg== X-Gm-Message-State: AOAM530ca86Hg4JNV6A7hFS38/08XpAEfGpd3PshVCod40Zhc0nFdJ67 fk+XjLKOvBT8fuHSca1C0PMKlw== X-Google-Smtp-Source: ABdhPJy9uqTeKGDE2WvyoBL+W3QZz3Y0/gkcwR4vQfRwPr0FI5APvxamrkxamDcP1aJbG1p46s9cEw== X-Received: by 2002:a17:90a:5d8b:: with SMTP id t11mr29665906pji.8.1637579312795; Mon, 22 Nov 2021 03:08:32 -0800 (PST) Received: from tyrell.hq.igel.co.jp (napt.igel.co.jp. [219.106.231.132]) by smtp.gmail.com with ESMTPSA id h6sm9572816pfh.82.2021.11.22.03.08.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Nov 2021 03:08:32 -0800 (PST) From: Shunsuke Mie To: Zhu Yanjun Cc: Shunsuke Mie , =?utf-8?q?Christian_K=C3=B6nig?= , Alex Deucher , Daniel Vetter , Doug Ledford , Jason Gunthorpe , Jianxin Xiong , Leon Romanovsky , Maor Gottlieb , Sean Hefty , Sumit Semwal , dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, dhobsong@igel.co.jp, taki@igel.co.jp, etom@igel.co.jp Subject: [RFC PATCH v4 1/2] RDMA/umem: Change for rdma devices has not dma device Date: Mon, 22 Nov 2021 20:08:16 +0900 Message-Id: <20211122110817.33319-2-mie@igel.co.jp> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211122110817.33319-1-mie@igel.co.jp> References: <20211122110817.33319-1-mie@igel.co.jp> Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org Current implementation requires a dma device for RDMA driver to use dma-buf memory space as RDMA buffer. However, software RDMA drivers has not dma device and copy RDMA data using CPU instead of hardware. This patch changes to be hold a dma-buf on struct ib_umem_dmabuf. This allows the software RDMA driver to map dma-buf memory for CPU memory accessing. Signed-off-by: Shunsuke Mie --- drivers/infiniband/core/umem_dmabuf.c | 20 ++++++++++++++++---- include/rdma/ib_umem.h | 1 + 2 files changed, 17 insertions(+), 4 deletions(-) diff --git a/drivers/infiniband/core/umem_dmabuf.c b/drivers/infiniband/core/umem_dmabuf.c index e824baf4640d..ebbb0a259fd4 100644 --- a/drivers/infiniband/core/umem_dmabuf.c +++ b/drivers/infiniband/core/umem_dmabuf.c @@ -117,9 +117,6 @@ struct ib_umem_dmabuf *ib_umem_dmabuf_get(struct ib_device *device, if (check_add_overflow(offset, (unsigned long)size, &end)) return ret; - if (unlikely(!ops || !ops->move_notify)) - return ret; - dmabuf = dma_buf_get(fd); if (IS_ERR(dmabuf)) return ERR_CAST(dmabuf); @@ -133,6 +130,8 @@ struct ib_umem_dmabuf *ib_umem_dmabuf_get(struct ib_device *device, goto out_release_dmabuf; } + umem_dmabuf->dmabuf = dmabuf; + umem = &umem_dmabuf->umem; umem->ibdev = device; umem->length = size; @@ -143,6 +142,13 @@ struct ib_umem_dmabuf *ib_umem_dmabuf_get(struct ib_device *device, if (!ib_umem_num_pages(umem)) goto out_free_umem; + /* Software RDMA drivers has not dma device. Just get dmabuf from fd */ + if (!device->dma_device) + goto done; + + if (unlikely(!ops || !ops->move_notify)) + goto out_free_umem; + umem_dmabuf->attach = dma_buf_dynamic_attach( dmabuf, device->dma_device, @@ -152,6 +158,7 @@ struct ib_umem_dmabuf *ib_umem_dmabuf_get(struct ib_device *device, ret = ERR_CAST(umem_dmabuf->attach); goto out_free_umem; } +done: return umem_dmabuf; out_free_umem: @@ -165,13 +172,18 @@ EXPORT_SYMBOL(ib_umem_dmabuf_get); void ib_umem_dmabuf_release(struct ib_umem_dmabuf *umem_dmabuf) { - struct dma_buf *dmabuf = umem_dmabuf->attach->dmabuf; + struct dma_buf *dmabuf = umem_dmabuf->dmabuf; + + if (!umem_dmabuf->attach) + goto free_dmabuf; dma_resv_lock(dmabuf->resv, NULL); ib_umem_dmabuf_unmap_pages(umem_dmabuf); dma_resv_unlock(dmabuf->resv); dma_buf_detach(dmabuf, umem_dmabuf->attach); + +free_dmabuf: dma_buf_put(dmabuf); kfree(umem_dmabuf); } diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h index 5ae9dff74dac..11c0cf7e0dd8 100644 --- a/include/rdma/ib_umem.h +++ b/include/rdma/ib_umem.h @@ -32,6 +32,7 @@ struct ib_umem { struct ib_umem_dmabuf { struct ib_umem umem; struct dma_buf_attachment *attach; + struct dma_buf *dmabuf; struct sg_table *sgt; struct scatterlist *first_sg; struct scatterlist *last_sg;