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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A7DC0C433F5 for ; Mon, 23 May 2022 21:02:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230271AbiEWVCP (ORCPT ); Mon, 23 May 2022 17:02:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58164 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230256AbiEWVB4 (ORCPT ); Mon, 23 May 2022 17:01:56 -0400 Received: from mx0a-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6BB46544D6 for ; Mon, 23 May 2022 14:01:54 -0700 (PDT) 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 24NKGS7I006514 for ; Mon, 23 May 2022 14:01:53 -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=ilot6pF2tnHcFgaXZ5dBLN2SL/JleYqHLnnHZG/ZMrY=; b=NWzM4z0yrVK6M8HqzbubslSNH2njepeMor6vTNfJmpMugXHZG/qU+JJMG2OluNSrD8+4 AwYYYrkmiRYidvqJ0PFUM4OnJWaVXloKlO7p2XTs3NfGQMgadmFz7DvEHQ9AYTsADl1r czGI9FOdENUF+EUH+1jtI/nU8ly0HrA6egA= Received: from maileast.thefacebook.com ([163.114.130.16]) by m0089730.ppops.net (PPS) with ESMTPS id 3g6uk7m7cs-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Mon, 23 May 2022 14:01:53 -0700 Received: from twshared8508.05.ash9.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.28; Mon, 23 May 2022 14:01:51 -0700 Received: by devbig007.nao1.facebook.com (Postfix, from userid 544533) id 8C8934464152; Mon, 23 May 2022 14:01:34 -0700 (PDT) From: Keith Busch To: , CC: , Kernel Team , , , , , Keith Busch Subject: [PATCHv3 2/6] block: export dma_alignment attribute Date: Mon, 23 May 2022 14:01:15 -0700 Message-ID: <20220523210119.2500150-3-kbusch@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220523210119.2500150-1-kbusch@fb.com> References: <20220523210119.2500150-1-kbusch@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-ORIG-GUID: d5w-ST-C0CVljUzOIj0yn1NC5MIpJWOg X-Proofpoint-GUID: d5w-ST-C0CVljUzOIj0yn1NC5MIpJWOg X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-23_09,2022-05-23_01,2022-02-23_01 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.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 --- v2->v3: Added Documentation (Bart) Documentation/ABI/stable/sysfs-block | 9 +++++++++ block/blk-sysfs.c | 7 +++++++ 2 files changed, 16 insertions(+) diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/sta= ble/sysfs-block index e8797cd09aff..08f6d00df138 100644 --- a/Documentation/ABI/stable/sysfs-block +++ b/Documentation/ABI/stable/sysfs-block @@ -142,6 +142,15 @@ Description: Default value of this file is '1'(on). =20 =20 +What: /sys/block//queue/dma_alignment +Date: May 2022 +Contact: linux-block@vger.kernel.org +Description: + Reports the alignment that user space addresses must have to be + used for raw block device access with O_DIRECT and other driver + specific passthrough mechanisms. + + What: /sys/block//queue/chunk_sectors Date: September 2016 Contact: Hannes Reinecke 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