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 4FC2BC433E1 for ; Mon, 18 May 2020 01:22:08 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 06631207F9 for ; Mon, 18 May 2020 01:22:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="CX1C6gQ3" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 06631207F9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 698AF80005; Sun, 17 May 2020 21:22:02 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4390E8000C; Sun, 17 May 2020 21:22:02 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2B6CA80005; Sun, 17 May 2020 21:22:02 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0196.hostedemail.com [216.40.44.196]) by kanga.kvack.org (Postfix) with ESMTP id D37728000C for ; Sun, 17 May 2020 21:22:01 -0400 (EDT) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 9ABBA824805A for ; Mon, 18 May 2020 01:22:01 +0000 (UTC) X-FDA: 76828088442.02.baby03_86091c96d3f49 X-HE-Tag: baby03_86091c96d3f49 X-Filterd-Recvd-Size: 9096 Received: from hqnvemgate24.nvidia.com (hqnvemgate24.nvidia.com [216.228.121.143]) by imf12.hostedemail.com (Postfix) with ESMTP for ; Mon, 18 May 2020 01:22:00 +0000 (UTC) Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate24.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Sun, 17 May 2020 18:19:38 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Sun, 17 May 2020 18:21:59 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Sun, 17 May 2020 18:21:59 -0700 Received: from HQMAIL109.nvidia.com (172.20.187.15) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Mon, 18 May 2020 01:21:59 +0000 Received: from hqnvemgw03.nvidia.com (10.124.88.68) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Mon, 18 May 2020 01:21:59 +0000 Received: from sandstorm.nvidia.com (Not Verified[10.2.48.175]) by hqnvemgw03.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Sun, 17 May 2020 18:21:59 -0700 From: John Hubbard To: Andrew Morton CC: Andy Walls , Mauro Carvalho Chehab , , LKML , , John Hubbard Subject: [PATCH 2/2] ivtv: convert get_user_pages() --> pin_user_pages() Date: Sun, 17 May 2020 18:21:57 -0700 Message-ID: <20200518012157.1178336-3-jhubbard@nvidia.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200518012157.1178336-1-jhubbard@nvidia.com> References: <20200518012157.1178336-1-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=1589764778; bh=xH5C6dG4bePEiW5mi0F4Wccp6bZO0ppe4EGiUHwyKL4=; 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=CX1C6gQ3Uc4S7SSx/ZsxTBahVSnoaDpWC3l01HcZefatkGC66AlShWq5rJKl8AifA vmW5VlhQ+4xVmr4wRskks+yW0d/6wd8ctYDfKqIVJNwkmEjThrCDShyUhqjvK1PyYF 1OdpyULk2UJckuFPpW3kXEuVt2CidPkPfH6LzRJhNUI0scO09uClU/UcEUjwHD9J0T fQcr50jUUVPfi8XG6JThpmWKhEUKScyCEW4gI0754E5+rtHXPqHsekQkFnEkZzAIB5 FQsBTB9Dmtwpjx0KZeyPtowlZVDTtViOoniPMR//5lVfjA1TLHuHZnMnIKvreTJXLp YZgjH86pydYVg== 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: This code was using get_user_pages*(), in a "Case 2" scenario (DMA/RDMA), using the categorization from [1]. That means that it's time to convert the get_user_pages*() + put_page() calls to pin_user_pages*() + unpin_user_pages() calls. There is some helpful background in [2]: basically, this is a small part of fixing a long-standing disconnect between pinning pages, and file systems' use of those pages. [1] Documentation/core-api/pin_user_pages.rst [2] "Explicit pinning of user-space pages": https://lwn.net/Articles/807108/ Signed-off-by: John Hubbard --- drivers/media/pci/ivtv/ivtv-udma.c | 19 ++++++------------- drivers/media/pci/ivtv/ivtv-yuv.c | 17 ++++++----------- drivers/media/pci/ivtv/ivtvfb.c | 4 ++-- 3 files changed, 14 insertions(+), 26 deletions(-) diff --git a/drivers/media/pci/ivtv/ivtv-udma.c b/drivers/media/pci/ivtv/iv= tv-udma.c index 5f8883031c9c..0d8372cc364a 100644 --- a/drivers/media/pci/ivtv/ivtv-udma.c +++ b/drivers/media/pci/ivtv/ivtv-udma.c @@ -92,7 +92,7 @@ int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_= dest_addr, { struct ivtv_dma_page_info user_dma; struct ivtv_user_dma *dma =3D &itv->udma; - int i, err; + int err; =20 IVTV_DEBUG_DMA("ivtv_udma_setup, dst: 0x%08x\n", (unsigned int)ivtv_dest_= addr); =20 @@ -111,16 +111,15 @@ int ivtv_udma_setup(struct ivtv *itv, unsigned long i= vtv_dest_addr, return -EINVAL; } =20 - /* Get user pages for DMA Xfer */ - err =3D get_user_pages_unlocked(user_dma.uaddr, user_dma.page_count, + /* Pin user pages for DMA Xfer */ + err =3D pin_user_pages_unlocked(user_dma.uaddr, user_dma.page_count, dma->map, FOLL_FORCE); =20 if (user_dma.page_count !=3D err) { IVTV_DEBUG_WARN("failed to map user pages, returned %d instead of %d\n", err, user_dma.page_count); if (err >=3D 0) { - for (i =3D 0; i < err; i++) - put_page(dma->map[i]); + unpin_user_pages(dma->map, err); return -EINVAL; } return err; @@ -130,9 +129,7 @@ int ivtv_udma_setup(struct ivtv *itv, unsigned long ivt= v_dest_addr, =20 /* Fill SG List with new values */ if (ivtv_udma_fill_sg_list(dma, &user_dma, 0) < 0) { - for (i =3D 0; i < dma->page_count; i++) { - put_page(dma->map[i]); - } + unpin_user_pages(dma->map, dma->page_count); dma->page_count =3D 0; return -ENOMEM; } @@ -153,7 +150,6 @@ int ivtv_udma_setup(struct ivtv *itv, unsigned long ivt= v_dest_addr, void ivtv_udma_unmap(struct ivtv *itv) { struct ivtv_user_dma *dma =3D &itv->udma; - int i; =20 IVTV_DEBUG_INFO("ivtv_unmap_user_dma\n"); =20 @@ -169,10 +165,7 @@ void ivtv_udma_unmap(struct ivtv *itv) /* sync DMA */ ivtv_udma_sync_for_cpu(itv); =20 - /* Release User Pages */ - for (i =3D 0; i < dma->page_count; i++) { - put_page(dma->map[i]); - } + unpin_user_pages(dma->map, dma->page_count); dma->page_count =3D 0; } =20 diff --git a/drivers/media/pci/ivtv/ivtv-yuv.c b/drivers/media/pci/ivtv/ivt= v-yuv.c index cd2fe2d444c0..5f7dc9771f8d 100644 --- a/drivers/media/pci/ivtv/ivtv-yuv.c +++ b/drivers/media/pci/ivtv/ivtv-yuv.c @@ -30,7 +30,6 @@ static int ivtv_yuv_prep_user_dma(struct ivtv *itv, struc= t ivtv_user_dma *dma, struct yuv_playback_info *yi =3D &itv->yuv_info; u8 frame =3D yi->draw_frame; struct yuv_frame_info *f =3D &yi->new_frame_info[frame]; - int i; int y_pages, uv_pages; unsigned long y_buffer_offset, uv_buffer_offset; int y_decode_height, uv_decode_height, y_size; @@ -62,12 +61,12 @@ static int ivtv_yuv_prep_user_dma(struct ivtv *itv, str= uct ivtv_user_dma *dma, ivtv_udma_get_page_info (&y_dma, (unsigned long)args->y_source, 720 * y_d= ecode_height); ivtv_udma_get_page_info (&uv_dma, (unsigned long)args->uv_source, 360 * u= v_decode_height); =20 - /* Get user pages for DMA Xfer */ - y_pages =3D get_user_pages_unlocked(y_dma.uaddr, + /* Pin user pages for DMA Xfer */ + y_pages =3D pin_user_pages_unlocked(y_dma.uaddr, y_dma.page_count, &dma->map[0], FOLL_FORCE); uv_pages =3D 0; /* silence gcc. value is set and consumed only if: */ if (y_pages =3D=3D y_dma.page_count) { - uv_pages =3D get_user_pages_unlocked(uv_dma.uaddr, + uv_pages =3D pin_user_pages_unlocked(uv_dma.uaddr, uv_dma.page_count, &dma->map[y_pages], FOLL_FORCE); } @@ -81,8 +80,7 @@ static int ivtv_yuv_prep_user_dma(struct ivtv *itv, struc= t ivtv_user_dma *dma, uv_pages, uv_dma.page_count); =20 if (uv_pages >=3D 0) { - for (i =3D 0; i < uv_pages; i++) - put_page(dma->map[y_pages + i]); + unpin_user_pages(&dma->map[y_pages], uv_pages); rc =3D -EFAULT; } else { rc =3D uv_pages; @@ -93,8 +91,7 @@ static int ivtv_yuv_prep_user_dma(struct ivtv *itv, struc= t ivtv_user_dma *dma, y_pages, y_dma.page_count); } if (y_pages >=3D 0) { - for (i =3D 0; i < y_pages; i++) - put_page(dma->map[i]); + unpin_user_pages(dma->map, y_pages); /* * Inherit the -EFAULT from rc's * initialization, but allow it to be @@ -112,9 +109,7 @@ static int ivtv_yuv_prep_user_dma(struct ivtv *itv, str= uct ivtv_user_dma *dma, /* Fill & map SG List */ if (ivtv_udma_fill_sg_list (dma, &uv_dma, ivtv_udma_fill_sg_list (dma, &y= _dma, 0)) < 0) { IVTV_DEBUG_WARN("could not allocate bounce buffers for highmem userspace= buffers\n"); - for (i =3D 0; i < dma->page_count; i++) { - put_page(dma->map[i]); - } + unpin_user_pages(dma->map, dma->page_count); dma->page_count =3D 0; return -ENOMEM; } diff --git a/drivers/media/pci/ivtv/ivtvfb.c b/drivers/media/pci/ivtv/ivtvf= b.c index 0c2859844081..e2d56dca5be4 100644 --- a/drivers/media/pci/ivtv/ivtvfb.c +++ b/drivers/media/pci/ivtv/ivtvfb.c @@ -281,10 +281,10 @@ static int ivtvfb_prep_dec_dma_to_device(struct ivtv = *itv, /* Map User DMA */ if (ivtv_udma_setup(itv, ivtv_dest_addr, userbuf, size_in_bytes) <=3D 0) = { mutex_unlock(&itv->udma.lock); - IVTVFB_WARN("ivtvfb_prep_dec_dma_to_device, Error with get_user_pages: %= d bytes, %d pages returned\n", + IVTVFB_WARN("ivtvfb_prep_dec_dma_to_device, Error with pin_user_pages: %= d bytes, %d pages returned\n", size_in_bytes, itv->udma.page_count); =20 - /* get_user_pages must have failed completely */ + /* pin_user_pages must have failed completely */ return -EIO; } =20 --=20 2.26.2