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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1539CC433EF for ; Wed, 4 May 2022 16:32:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:CC:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=kHCxhgTRVCZCY0wTUT+Ftx2hh6wYUIhaJ3MlJ1aPO9M=; b=lTQaF5eXixWFyO21mIe8jwbA0S bqIrmhtm0GKQ13pxhnT8qHOTAOC8y/DcGaAPoD71tDXyZTQgpUU6pHigQE/ZiJuhLZrRUwKBKniS5 yTjkPVAA58Fvc5mNweRDkijHQVhc2F3rkf/uTyCfvqclImrICgksKLjM3tlNM7kYYyE2bPZA8OSd1 aLSEWhqidLpXCXrBb7uWS3se6ge+c9ulU8hRCpxHjt0VhfM8nhT56r0OWpgCMQiNlLKKwrmQQd5sa cQXxc1g8bbCdJttDbSv16xP669nGR7atWsNr/W3xVax6Urgkc8845UUbvrC8uYcXglwPafJYCtOgB +SaSAIvw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nmHvj-00Bfno-I3; Wed, 04 May 2022 16:32:47 +0000 Received: from mx0b-00082601.pphosted.com ([67.231.153.30] helo=mx0a-00082601.pphosted.com) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nmHvX-00BfjI-EF for linux-nvme@lists.infradead.org; Wed, 04 May 2022 16:32:36 +0000 Received: from pps.filterd (m0089730.ppops.net [127.0.0.1]) by m0089730.ppops.net (8.17.1.5/8.17.1.5) with ESMTP id 244Dvfor001359 for ; Wed, 4 May 2022 09:32:34 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=kHCxhgTRVCZCY0wTUT+Ftx2hh6wYUIhaJ3MlJ1aPO9M=; b=J3TEJX35Je29viL31mJQhGfNtJyn1qfVpKIZTps77nTQiXaXZKLFg/K4WEkw5San/zgI Kx1dDJyedJG9+Vo2r3RW6BtZTLEIkqVdwMJmhLA9yTVRKjtBdj0gwt3nZghPwymca552 rL4CRes0krZ/3yccBzQVOVYJXOxolC71m6Q= Received: from mail.thefacebook.com ([163.114.132.120]) by m0089730.ppops.net (PPS) with ESMTPS id 3fuf22c20r-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 04 May 2022 09:32:34 -0700 Received: from twshared8508.05.ash9.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:11d::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Wed, 4 May 2022 09:32:33 -0700 Received: by devbig007.nao1.facebook.com (Postfix, from userid 544533) id A22323939681; Wed, 4 May 2022 09:32:22 -0700 (PDT) From: Keith Busch To: , CC: , , Keith Busch Subject: [RFC 1/4] block: export dma_alignment attribute Date: Wed, 4 May 2022 09:32:04 -0700 Message-ID: <20220504163207.891761-2-kbusch@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220504163207.891761-1-kbusch@fb.com> References: <20220504163207.891761-1-kbusch@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-GUID: 1Pd3Cf5XEPQ7L6HsuRTFfkUKmEvM95sv X-Proofpoint-ORIG-GUID: 1Pd3Cf5XEPQ7L6HsuRTFfkUKmEvM95sv X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.858,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-04_04,2022-05-04_02,2022-02-23_01 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220504_093235_640157_C1664AA6 X-CRM114-Status: GOOD ( 15.00 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org From: Keith Busch User space may want to know how to align their buffers to avoid bouncing. Export the queue attribute. Signed-off-by: Keith Busch --- block/blk-sysfs.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 88bd41d4cb59..14607565d781 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -274,6 +274,11 @@ static ssize_t queue_virt_boundary_mask_show(struct = request_queue *q, char *page return queue_var_show(q->limits.virt_boundary_mask, page); } =20 +static ssize_t queue_dma_alignment_show(struct request_queue *q, char *p= age) +{ + return queue_var_show(queue_dma_alignment(q), page); +} + #define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \ static ssize_t \ queue_##name##_show(struct request_queue *q, char *page) \ @@ -606,6 +611,7 @@ QUEUE_RO_ENTRY(queue_dax, "dax"); QUEUE_RW_ENTRY(queue_io_timeout, "io_timeout"); QUEUE_RW_ENTRY(queue_wb_lat, "wbt_lat_usec"); QUEUE_RO_ENTRY(queue_virt_boundary_mask, "virt_boundary_mask"); +QUEUE_RO_ENTRY(queue_dma_alignment, "dma_alignment"); =20 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW QUEUE_RW_ENTRY(blk_throtl_sample_time, "throttle_sample_time"); @@ -667,6 +673,7 @@ static struct attribute *queue_attrs[] =3D { &blk_throtl_sample_time_entry.attr, #endif &queue_virt_boundary_mask_entry.attr, + &queue_dma_alignment_entry.attr, NULL, }; =20 --=20 2.30.2