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 EDACDC4332F for ; Wed, 23 Nov 2022 20:58:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239384AbiKWU6U (ORCPT ); Wed, 23 Nov 2022 15:58:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52440 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239170AbiKWU6H (ORCPT ); Wed, 23 Nov 2022 15:58:07 -0500 Received: from mail-pf1-f178.google.com (mail-pf1-f178.google.com [209.85.210.178]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0AF29E0C8; Wed, 23 Nov 2022 12:58:03 -0800 (PST) Received: by mail-pf1-f178.google.com with SMTP id x66so9828778pfx.3; Wed, 23 Nov 2022 12:58:03 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=rbxM8TRTKqiQCaG2etHAP+UycEMVCiMfi11R98Xmp3U=; b=dRsh2TZAbnpcILQaMRoIWftrBqPvKesDwUIFtUZnHRRLPGM6pj8qRJoSOcRiL2K1xH kNam7ApNCTtkj1N511uYtf5mQmOxtA9RFEAl46LJiTG6jI8fth47oCJ49Cx46YaQjRVA 7FY8IPl17Zv8Ij/Vz/2/gqeKj+EBSExgq5CReHcAHIK7xZW6dAlNtgKLnhtj9jEGhvjJ Ti2sO3EMELf1lwRo8nMrSeDW12+1/lZ4petgaajCjmfA/+rNG1JVPq55gDURmS9CTId0 n6BysEyMpACHWGrhGuwtAJ/aDLeTK8Jq0dB5dm173F6NixVJe7ARU09DAvs9qC2iwxrK LUdw== X-Gm-Message-State: ANoB5pmEwTY/kxhFSS+eorcxJZaMjcmVvrgm5zMgVSNh4DGPr8g/wrkW +wPexIx3dqz8M5SQZQOYs4o= X-Google-Smtp-Source: AA0mqf59rGefP6xlUHtt0s7z/ntEnAYFtQJ3hLgZe4eN8vMiGWPmpoRjliG1W+ukJ2I0u6tPnBmwRA== X-Received: by 2002:a62:5f81:0:b0:56b:bb06:7dd5 with SMTP id t123-20020a625f81000000b0056bbb067dd5mr11190009pfb.3.1669237082397; Wed, 23 Nov 2022 12:58:02 -0800 (PST) Received: from bvanassche-glaptop2.roam.corp.google.com ([2601:642:4c02:686d:4311:4764:eee7:ac6d]) by smtp.gmail.com with ESMTPSA id i89-20020a17090a3de200b0020b2082e0acsm1858809pjc.0.2022.11.23.12.58.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Nov 2022 12:58:01 -0800 (PST) From: Bart Van Assche To: Jens Axboe Cc: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, Christoph Hellwig , Adrian Hunter , Avri Altman , Bart Van Assche Subject: [PATCH v2 0/8] Add support for segments smaller than one page Date: Wed, 23 Nov 2022 12:57:32 -0800 Message-Id: <20221123205740.463185-1-bvanassche@acm.org> X-Mailer: git-send-email 2.38.1.584.g0f3c55d4c2-goog MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Hi Jens, Several embedded storage controllers need support for DMA segments that are smaller than the size of one virtual memory page. Hence this patch series. Please consider this patch series for the next merge window. Thanks, Bart. Changes compared to v1: - Added a CONFIG variable that controls whether or not small segment support is enabled. - Improved patch descriptions. Bart Van Assche (8): block: Introduce CONFIG_BLK_SUB_PAGE_SEGMENTS and QUEUE_FLAG_SUB_PAGE_SEGMENTS block: Support configuring limits below the page size block: Support submitting passthrough requests with small segments block: Add support for filesystem requests and small segments block: Add support for small segments in blk_rq_map_user_iov() scsi: core: Set the SUB_PAGE_SEGMENTS request queue flag scsi_debug: Support configuring the maximum segment size null_blk: Support configuring the maximum segment size block/Kconfig | 9 +++++++ block/blk-map.c | 43 ++++++++++++++++++++++++++----- block/blk-merge.c | 6 +++-- block/blk-mq.c | 2 ++ block/blk-settings.c | 20 ++++++++------ block/blk.h | 14 +++++++++- drivers/block/null_blk/main.c | 20 +++++++++++--- drivers/block/null_blk/null_blk.h | 1 + drivers/scsi/scsi_debug.c | 3 +++ drivers/scsi/scsi_lib.c | 2 ++ include/linux/blkdev.h | 7 +++++ 11 files changed, 107 insertions(+), 20 deletions(-)