From patchwork Thu Aug 12 07:50:14 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: 12432777 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=-16.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,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 1856DC4320A for ; Thu, 12 Aug 2021 07:50:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0182A60FC4 for ; Thu, 12 Aug 2021 07:50:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234889AbhHLHuq (ORCPT ); Thu, 12 Aug 2021 03:50:46 -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 S234835AbhHLHuq (ORCPT ); Thu, 12 Aug 2021 03:50:46 -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=1628754622; x=1660290622; h=from:to:subject:date:message-id:in-reply-to:references: mime-version:content-transfer-encoding; bh=YlAMtc1NFjSacQjRaTROX9F+tPKC3ulFDw9e3bnV9hc=; b=Vm7+3fYEDsUDGjRIgh2yBAeCMsi514ySRNf59otq2mInB6FB024aTxS0 X548oAW8fScw8M6bLMDSaDqeNeD6M1PfaqDNt/1/izsS30EdoGAWPgaFq uJ8cp2DQdeTXeYNMu8jfRPjVXKiONrHKTD3Qg/Kz0EdRBYs6umxJaSvZE hOOZ4vEGZnjuFXHGYOaiTpmirh/QNQrQI/ysDx+NiGtXiHNA3lWmilvYX YjXEkhFMzwNHznA58OsWWzXDtOjEct1AgcRYrG4vHwkrBF0I9xYHrbOjW bdFsQMI3MWTqbhpwnhq/45p30vEN70XPt/nhdSxri4bNd2HP3kOiDXQ9F Q==; X-IronPort-AV: E=Sophos;i="5.84,315,1620662400"; d="scan'208";a="177596940" 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 15:50:22 +0800 IronPort-SDR: 511GsPTHmc/zdqV5gAOTtCjQbfj1BOAP6+LhLMVoG1FzyUsYgBV5zx2oHEpGVlY20quHnnvwQ+ NLVcfSk6yyJnBYjvBZts+/BvIWrzWW0o7MRqLi0MWeYo44FB9Iw/R2iEXH3aAQAtqcviQkwUyS v0pATP5y6epbVrMssohp1d47GgU3RFMKJ0/K4YyrcYrWI1Z9ue3zM73yEKYZdbiyCi8rtUN41i 3YVKC8iJpG802o6Q9wd/PxNOl22p2kpDk5mwlEJyVwPoM17Vrv+xkwhhyfSMfrAIOdxk+5UpDh OQw46Ow+wsaF2Abs/CIigCxG 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 00:25:50 -0700 IronPort-SDR: 45mIB9a3kPaZT45ITWNTcPeuOKSyxNfYC91NcK604gespplMBM3w22tgseVEaWVa5nMU6D2pxv QQAMePXmBcorhCm6O0u8a9ulOpYtbaFnBcdvzS31wn2+X5JeeLmJATE3p9Hpd0mFD5+thuRFuK 4MTlvpGynw7jwhhNeDc9w8wQU/CowBzeftWYrEJS+dfaLIjJJX9LGtmHuISSfgQqW+MklhzQ4R DJgd7hMyaJPevSKlt6l8gvxkO+dDL3SMoTU1N7fF76yXjG9ZmONrAEH3ysbaj22w5Wy3q/9Kpi KHc= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip02.wdc.com with ESMTP; 12 Aug 2021 00:50:20 -0700 From: Damien Le Moal To: Jens Axboe , linux-block@vger.kernel.org, "Martin K . Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH v5 4/5] doc: document sysfs queue/cranges attributes Date: Thu, 12 Aug 2021 16:50:14 +0900 Message-Id: <20210812075015.1090959-5-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210812075015.1090959-1-damien.lemoal@wdc.com> References: <20210812075015.1090959-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Update the file Documentation/block/queue-sysfs.rst to add a description of a device queue sysfs entries related to concurrent sector ranges (e.g. concurrent positioning ranges for multi-actuator hard-disks). While at it, also fix a typo in this file introduction paragraph. Signed-off-by: Damien Le Moal Reviewed-by: Hannes Reinecke Reviewed-by: Christoph Hellwig --- Documentation/block/queue-sysfs.rst | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/Documentation/block/queue-sysfs.rst b/Documentation/block/queue-sysfs.rst index 4dc7f0d499a8..757609bbb1e2 100644 --- a/Documentation/block/queue-sysfs.rst +++ b/Documentation/block/queue-sysfs.rst @@ -286,4 +286,32 @@ sequential zones of zoned block devices (devices with a zoned attributed that reports "host-managed" or "host-aware"). This value is always 0 for regular block devices. +cranges (RO) +------------ + +The presence of this sub-directory of the /sys/block/xxx/queue/ directory +indicates that the device is capable of executing requests targeting +different sector ranges in parallel. For instance, single LUN multi-actuator +hard-disks will likely have a cranges directory if the device correctly +advertizes the sector ranges of its actuators. + +The cranges directory contains one directory per concurrent range, with each +range described using the sector (RO) attribute file to indicate the first +sector of the range and the nr_sectors (RO) attribute file to indicate the +total number of sector in the range starting from the first sector. +For example, a dual-actuator hard disk will have the following cranges +entries.:: + + $ tree /sys/block//queue/cranges/ + /sys/block//queue/cranges/ + |-- 0 + | |-- nr_sectors + | `-- sector + `-- 1 + |-- nr_sectors + `-- sector + +The sector and nr_sectors attributes use 512B sector unit, regardless of +the actual block size of the device. + Jens Axboe , February 2009