From patchwork Thu Aug 12 02:26:21 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: 12432301 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=-11.6 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 BF21CC432BE for ; Thu, 12 Aug 2021 02:26:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 935966105A for ; Thu, 12 Aug 2021 02:26:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233533AbhHLC1N (ORCPT ); Wed, 11 Aug 2021 22:27:13 -0400 Received: from esa2.hgst.iphmx.com ([68.232.143.124]:55294 "EHLO esa2.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229729AbhHLC1M (ORCPT ); Wed, 11 Aug 2021 22:27:12 -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=1628735208; x=1660271208; h=from:to:subject:date:message-id:mime-version: content-transfer-encoding; bh=oyDc3RkVhBAkytz5i1T7Vr3QZ0lcUkXM3PwELPUqjKg=; b=ILt6FpwZ8wvayyH8/Uns4x6oAzA5JbdNDgufIdmAmjpE2lXwOwILBEcy NCT40OpxHqIT70M8CCfGNu8KF6uEkrHVikAherT6IMsNzLhb0iirix1K8 pwRzSHMoXcwMcP8Pbm/FcflduhCcIpB6Pwvazal9ACXYskrvnC0+q7m1v foYT+QTprVTpskzxMBeanvV4s0ODO2hmLuzIo3W8aGzmnHT3nGTsJVRv7 PGIofwHAuj0NVOISl9jlNGTBcOZR4dl4ATs71scGp807H3WtPLdcw6AkH 9cH74zS2msAAxnzJtYLPngLB8+XPMRuPCyUEga6Idjtp6FJeIJ7uoKRNF A==; X-IronPort-AV: E=Sophos;i="5.84,314,1620662400"; d="scan'208";a="280823436" Received: from h199-255-45-14.hgst.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 12 Aug 2021 10:26:47 +0800 IronPort-SDR: K4IDMOqqRVYdA9knFfcud/MQdjfvXOnVSJcR4YWmkeXxwJ9WjEJetUR3EA4DVQkuqBaLhdpxLj XGgoQNoHoUouHv1TouwPdRu+lABjBP0wt/TR3pTiaTr4WazgZ4ZsEUcj/rwcAQN9Z32gticdoL iASNSmSy1bgwxBkMZtwt44STmysLlbJhH0mo6+FtAFGYdEdx5Ph9Vouw5G2cXSZcsfwdQFp78Q HSws10/Z9L9MNp/5kANldnv8A/R3zOx1HqM1CElzloUhijaM+CfS9jok/4+ZMaaAPOZumypP66 eZPfzsfFtPyhj2kkS3pOH1F4 Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep01.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Aug 2021 19:04:06 -0700 IronPort-SDR: KV+44CP4TlrGMAu2vQokGzgK1dMAF/Lw80OLF0vmMjyR4SLS48sDRO3k2r6a1NaV2L0aEVni09 dAzAINK2JNNxPt3Hk+rbnLj7PNG8Oeo7HAcKSIBoDVuKQjkN0TGkybMQJC/uj3n558tMs/nHOa XJsMq9wm5rJ6zMMXJfLrfWDGqbSnDyTwZ6tywvBln1aHlF8pbGqYNYIIZUGLCPEn9rdsMiWMJY 1m4eqsUjcH9empNbbPJqTcQ5P7K/jINawEBuK8Rzx9Zka14OSW0s/mV8hGvWcis9mEMq/skGLn 95I= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip02.wdc.com with ESMTP; 11 Aug 2021 19:26:46 -0700 From: Damien Le Moal To: Jens Axboe , linux-block@vger.kernel.org, "Martin K . Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH v4 0/5] Initial support for multi-actuator HDDs Date: Thu, 12 Aug 2021 11:26:21 +0900 Message-Id: <20210812022626.694329-1-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@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 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