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 26DDCC433EF for ; Fri, 10 Jun 2022 20:04:26 +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=d8bkh7bfZZY5WjJ1g5p81fAjYDMdOKOPAhoGcAryaQs=; b=BikpHZvQJINSIkDu/FSQOSpK+y aiO/jslBtHVbNLNtB7c3s6OL19XxlNqB9Uo/ozLcmx0digceUxlIwA2G35Drh0pz8dqQRttgsSa/V 3gPhjrlsBc/qj8OWWNKnNVWcsVhn5PbCR1E4ph7wwK90R1jmlBLQRk05SvRRiwaeVUCk0OnNvOhtW yMsxQOmjdbphgzr3MHcTnLX1R6eOY0JsBULW7vzCxsJoI+Ak3J9gljLHJG2m61Tb+UkVRMGsVyyTu u3NJo2yCLP2u1kkjiZADxv1XLFtqb1MTsTLT9djCFokIJP2uYR+5Vars5hiMmQRwf5qb7VoPu9/Sh 4wYNZM6w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nzkrm-009dQB-LF; Fri, 10 Jun 2022 20:04:22 +0000 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nzkrf-009dOU-DC for linux-nvme@lists.infradead.org; Fri, 10 Jun 2022 20:04:18 +0000 Received: from pps.filterd (m0109332.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 25AIDr74028846 for ; Fri, 10 Jun 2022 13:04:12 -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=d8bkh7bfZZY5WjJ1g5p81fAjYDMdOKOPAhoGcAryaQs=; b=kH9v/ayu679VGaCZ+C4IvFjZt/07EaKj4vRvCHMau5dISJI6AY4GAnsiCwvwwY3NHgXy Tx8HdLP79eCJ3hsE/UMFk6wQmSrDWm28Txay4ArVEAeznAu/CMNKzJLc+OJDxAbmzXnR TQadrCvQLuqT1F0VBQ+GIShLSuoHGanKD6E= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3gmb208m54-6 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 10 Jun 2022 13:04:11 -0700 Received: from twshared5413.23.frc3.facebook.com (2620:10d:c085:108::4) by mail.thefacebook.com (2620:10d:c085:11d::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.28; Fri, 10 Jun 2022 13:04:10 -0700 Received: by devbig007.nao1.facebook.com (Postfix, from userid 544533) id 99F384E9D696; Fri, 10 Jun 2022 12:58:31 -0700 (PDT) From: Keith Busch To: , , CC: , Kernel Team , , , , , , Keith Busch , Johannes Thumshirn Subject: [PATCHv6 03/11] block: export dma_alignment attribute Date: Fri, 10 Jun 2022 12:58:22 -0700 Message-ID: <20220610195830.3574005-4-kbusch@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220610195830.3574005-1-kbusch@fb.com> References: <20220610195830.3574005-1-kbusch@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-GUID: K7QI5MLIpPCU6sor0aywwM5AArwm_0ZY X-Proofpoint-ORIG-GUID: K7QI5MLIpPCU6sor0aywwM5AArwm_0ZY X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.517,FMLib:17.11.64.514 definitions=2022-06-10_08,2022-06-09_02,2022-02-23_01 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220610_130415_942655_0E29C998 X-CRM114-Status: GOOD ( 15.14 ) 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 Reviewed-by: Johannes Thumshirn Reviewed-by: Christoph Hellwig --- 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..cd14ecb3c9a5 100644 --- a/Documentation/ABI/stable/sysfs-block +++ b/Documentation/ABI/stable/sysfs-block @@ -260,6 +260,15 @@ Description: for discards, and don't read this file. =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/fua Date: May 2018 Contact: linux-block@vger.kernel.org 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