From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DEDB3C43603 for ; Wed, 4 Dec 2019 21:36:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AAC11206DF for ; Wed, 4 Dec 2019 21:36:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="ptXEQ04x" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727982AbfLDVgM (ORCPT ); Wed, 4 Dec 2019 16:36:12 -0500 Received: from hqnvemgate25.nvidia.com ([216.228.121.64]:3166 "EHLO hqnvemgate25.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728011AbfLDVgI (ORCPT ); Wed, 4 Dec 2019 16:36:08 -0500 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate25.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Wed, 04 Dec 2019 13:36:03 -0800 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Wed, 04 Dec 2019 13:36:07 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Wed, 04 Dec 2019 13:36:07 -0800 Received: from HQMAIL111.nvidia.com (172.20.187.18) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 4 Dec 2019 21:36:04 +0000 Received: from hqnvemgw03.nvidia.com (10.124.88.68) by HQMAIL111.nvidia.com (172.20.187.18) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Wed, 4 Dec 2019 21:36:04 +0000 Received: from blueforge.nvidia.com (Not Verified[10.110.48.28]) by hqnvemgw03.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Wed, 04 Dec 2019 13:36:04 -0800 From: John Hubbard To: Andrew Morton , Jason Gunthorpe , Leon Romanovsky , Christoph Hellwig CC: Ira Weiny , , , LKML , John Hubbard , Christoph Hellwig , Jan Kara , Jason Gunthorpe Subject: [PATCH v2 2/2] IB/umem: use get_user_pages_fast() to pin DMA pages Date: Wed, 4 Dec 2019 13:36:03 -0800 Message-ID: <20191204213603.464373-3-jhubbard@nvidia.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191204213603.464373-1-jhubbard@nvidia.com> References: <20191204213603.464373-1-jhubbard@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable Content-Type: text/plain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1575495363; bh=wK/7Zcr9JkY1oVaBb+a1odFvVDUbZPXG7o4esu8lpZI=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:X-NVConfidentiality: Content-Transfer-Encoding:Content-Type; b=ptXEQ04xcPn8GdBQs2rp1XVY1OuF77GjHPSFFgY17UMuAVXRuuciVJqui9dCSv87B yCbOSxw7VjnSJQGnrVsT1Xq5Wqzv4+IqtS9m8ZPYl8LmZw6MkaTA5hLyDoM0xHXNPO Av16EWu/XC/kClF+whWx+5CFr/TIxNY7i2Se1qYu2a6jWWeRXdqPqg3uus4rEBVfaS i+8V/puwLz7IlHI2zyKxfZlWG0cjzbtmv0aDISe02uxsmQUApNlguxclaR436XBAyk 7gYqtM6Sg/CovzDx0g3o8qQgztOvXDyXdmH1W1G4A4gb863I1mfGx+WrBqJHiFIclE Pb9Y3ZnPvGwUQ== Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org And get rid of the mmap_sem calls, as part of that. Note that get_user_pages_fast() will, if necessary, fall back to __gup_longterm_unlocked(), which takes the mmap_sem as needed. Reviewed-by: Christoph Hellwig Reviewed-by: Jan Kara Reviewed-by: Jason Gunthorpe Reviewed-by: Ira Weiny Signed-off-by: John Hubbard --- drivers/infiniband/core/umem.c | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-) diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.= c index 7a3b99597ead..214e87aa609d 100644 --- a/drivers/infiniband/core/umem.c +++ b/drivers/infiniband/core/umem.c @@ -266,16 +266,13 @@ struct ib_umem *ib_umem_get(struct ib_udata *udata, u= nsigned long addr, sg =3D umem->sg_head.sgl; =20 while (npages) { - down_read(&mm->mmap_sem); - ret =3D get_user_pages(cur_base, - min_t(unsigned long, npages, - PAGE_SIZE / sizeof (struct page *)), - gup_flags | FOLL_LONGTERM, - page_list, NULL); - if (ret < 0) { - up_read(&mm->mmap_sem); + ret =3D get_user_pages_fast(cur_base, + min_t(unsigned long, npages, + PAGE_SIZE / + sizeof(struct page *)), + gup_flags | FOLL_LONGTERM, page_list); + if (ret < 0) goto umem_release; - } =20 cur_base +=3D ret * PAGE_SIZE; npages -=3D ret; @@ -283,8 +280,6 @@ struct ib_umem *ib_umem_get(struct ib_udata *udata, uns= igned long addr, sg =3D ib_umem_add_sg_table(sg, page_list, ret, dma_get_max_seg_size(context->device->dma_device), &umem->sg_nents); - - up_read(&mm->mmap_sem); } =20 sg_mark_end(sg); --=20 2.24.0