From patchwork Thu Aug 12 07:50:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 12432765 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=-11.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 7F925C4338F for ; Thu, 12 Aug 2021 07:50:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5F45C6101E for ; Thu, 12 Aug 2021 07:50:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234795AbhHLHum (ORCPT ); Thu, 12 Aug 2021 03:50:42 -0400 Received: from esa6.hgst.iphmx.com ([216.71.154.45]:51846 "EHLO esa6.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232348AbhHLHum (ORCPT ); Thu, 12 Aug 2021 03:50:42 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1628754618; x=1660290618; h=from:to:subject:date:message-id:mime-version: content-transfer-encoding; bh=4u8e9rFyNPDmv1NIZxmllueH6Qf71aOKm4JtYfad7S4=; b=O2YiMC/gmNcRBmXV5fcRz4fkPAqpfbbQM1cdyb5t1+Ql43QAsVjs8iLY lKlGXLg9lEuWAA/LJiCR7ua+EvEeftL4JDjgPr1s5N4cCJQ+bJ5MOLAUB FQ8CU2EcaQKJg/7zKWsR59g6TvV7YRaKyXmkLBQgF8i+KVwW8czajPdWa dApbO015ItBTtcDOsf32KVXSkEUB9xVS/KN2sNBSyeD4su7MAKtsTxu5R EckDA86waDQnch3BGx8NBLIclV5ROj35h378Pgzamdus8Gerlx56mBM0I LvBXb1Px2FNY8U/YIzBN90iDVUfaJey/2Q4qYc1xidh6izgMdvxBz/Bvy A==; X-IronPort-AV: E=Sophos;i="5.84,315,1620662400"; d="scan'208";a="177596931" Received: from uls-op-cesaip02.wdc.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 12 Aug 2021 15:50:17 +0800 IronPort-SDR: +tNerFHQTUi0RC1CH+kq2x1BZFyTsav8fNaXr2hA2/0l+f8PJacb94iSqJv44EZNS47Fy/unDf maQ4y631dp5at/aJqvyVt8NFmOk8LWP/GNelaNN0Ij6P5UZ7Sw25yFC4idXYx49DKGqMnyjCJ2 kIZSMw78eD8s4B4LBroFS5ozA3jLwxiSbqTmx6xCAoUUAdKJgxYzxH59kTELH1t87WgTmml+s2 xf2saIkFi5jLEdsFGDa4DBVIgb6HagSzUKmV5GzZzrM7URQIraqRiUFNXwe8GWQ/dHBwIn/N2u 7KoEgQrrsLr6JkPFCt64hCuk Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Aug 2021 00:25:46 -0700 IronPort-SDR: +Bh2yLsoIrS4Vo5rs2t1Ncasyk/+FAgq9Rd/MOpoIyaztNsjj4pPwEybVx1gsD9EbPL9hIG6/S KPyd1whWQOHPQu7NXbYA8fkacAwelOYyQeDltxpuMA9EzLvt+TU2wBR3y1+3ikozan9rYDRYNE 0H4skHVgS+iKBv1OBb6/bNYlHWQSWGhNmGujpTzfgIS3XrEAB7akPQIAZ9nx8+LM64Nv/TCOgQ kffKW34ututYaNPTowaXQJ3ajrB7BIACibD94egjjTNQlQ6SelJ8TSancjWfemGfGoNiD79tfo 0Aw= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip02.wdc.com with ESMTP; 12 Aug 2021 00:50:16 -0700 From: Damien Le Moal To: Jens Axboe , linux-block@vger.kernel.org, "Martin K . Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH v5 0/5] Initial support for multi-actuator HDDs Date: Thu, 12 Aug 2021 16:50:10 +0900 Message-Id: <20210812075015.1090959-1-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Single LUN multi-actuator hard-disks are cappable to seek and execute multiple commands in parallel. This capability is exposed to the host using the Concurrent Positioning Ranges VPD page (SCSI) and Log (ATA). Each positioning range describes the contiguous set of LBAs that an actuator serves. This series adds support the scsi disk driver to retreive this information and advertize it to user space through sysfs. libata is also modified to handle ATA drives. The first patch adds the block layer plumbing to expose concurrent sector ranges of the device through sysfs as a sub-directory of the device sysfs queue directory. Patch 2 and 3 add support to sd and libata. Finally patch 4 documents the sysfs queue attributed changes. Patch 5 fixes a typo in the document file (strictly speaking, not related to this series). This series does not attempt in any way to optimize accesses to multi-actuator devices (e.g. block IO scheduler or filesystems). This initial support only exposes the actuators information to user space through sysfs. Changes from v4: * Fixed kdoc comment function name mismatch for disk_register_cranges() in patch 1 Changes from v3: * Modified patch 1: - Prefix functions that take a struct gendisk as argument with "disk_". Modified patch 2 accordingly. - Added a functional release operation for struct blk_cranges kobj to ensure that this structure is freed only after all references to it are released, including kobject_del() execution for all crange sysfs entries. * Added patch 5 to separate the typo fix from the crange documentation addition. * Added reviewed-by tags Changes from v2: * Update patch 1 to fix a compilation warning for a potential NULL pointer dereference of the cr argument of blk_queue_set_cranges(). Warning reported by the kernel test robot ). Changes from v1: * Moved libata-scsi hunk from patch 1 to patch 3 where it belongs * Fixed unintialized variable in patch 2 Reported-by: kernel test robot Reported-by: Dan Carpenter