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 X-Spam-Level: X-Spam-Status: No, score=-16.6 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=unavailable 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 BD1CEC00142 for ; Fri, 23 Jul 2021 01:22:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9AF2560EBC for ; Fri, 23 Jul 2021 01:22:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233070AbhGWAlg (ORCPT ); Thu, 22 Jul 2021 20:41:36 -0400 Received: from esa6.hgst.iphmx.com ([216.71.154.45]:43109 "EHLO esa6.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233050AbhGWAld (ORCPT ); Thu, 22 Jul 2021 20:41:33 -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=1627003329; x=1658539329; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Fpqlmg/Ix9cd3tQyYAdjWjc+IVx8h6CJqsftFHNVSGM=; b=HNkapwUe74UDa5SEJWZOZtsZlAUnQAjg4alhZFxBBR97A/Rtvk64m5aw 0HZKs6ZZ/THMkk9xxNUWdkDYrY12mtqXNy4dfTxsq8Gb0JK5018BoowGC p6HPts+NrionfJPMfv2IRdvjCPI55G38F/9pqbXS0zMIj6L7BeATIksxV l69qWhA8HKdaXUGeUikH51zdgxYGta6kjtxw6zZzXngEitJVUVeTOwmxf xZSgq4p1a9N/0cEpzWUZl0XLdfXVGwJICPytrKtAVuiaNMNgJrbc1/ilL R0KVtE+kPm50vbpdD9t05MOasS9XzqcIWVil+KlYqDZdLmeJ3AarIafPd Q==; X-IronPort-AV: E=Sophos;i="5.84,262,1620662400"; d="scan'208";a="175874127" Received: from uls-op-cesaip01.wdc.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 23 Jul 2021 09:22:08 +0800 IronPort-SDR: OAuTfhH1Ku7ElghWYcsAVbdMF2fINNdMDQ5Lw8LT/ydP+SwQ6gpTj7dPP6NWtyM9AcjysdkMkI Li0hAVvLEdPp/hp/KNo4m5sCNqzxHBSeC6Sb6OdQ2UqyEQVeS/vroBGPliV35b5PFnBwsTU5Cb ykYnjMf9ZTanp6yK5ja8mP0b1e21qktFJchnCbNrhNwWG7LLbaFwhf3lzsrLEyJE1Zn2AEZeyB mls5HparWPza2odeXshwe1COmwQ6SIQGBnCi48fI0pvR9URCDH+RAjHWGvPNen2YjcTWx5i+av wY+TA+IM4zf9NXZCLE9cMcW7 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; 22 Jul 2021 17:59:58 -0700 IronPort-SDR: Ro+nQZ4/KBXkhCujmPzqjhLSP41jBw0T/A8simmQRMIEb2T8owBdgZFP67YRVgyS6OM/GVcWai KCy091i+ByoI82fMdp63P6YgDWcA/Yr6JcItgvqzZhOKKDobIdg8+qAW6M5kgmm0tz1W4k5ZGN l78NVgo3FZmmOZ35grDlOq35rFJi6ehn2ufU558SwT5hgMFgoOBGwamLJ+CDdBDxAG13im0Pmo AEpZWlkcO+LaJTN5+lHhswINPUMe9zNm1GM7+JozNuvZHDbYQ3kb3XkYse5KlG94bIbRoq2Zy7 N0w= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip02.wdc.com with ESMTP; 22 Jul 2021 18:22:06 -0700 From: Damien Le Moal To: linux-block@vger.kernel.org, Jens Axboe , linux-scsi@vger.kernel.org, "Martin K . Petersen" , linux-ide@vger.kernel.org Cc: Hannes Reinecke Subject: [PATCH v2 4/4] doc: document sysfs queue/cranges attributes Date: Fri, 23 Jul 2021 10:22:00 +0900 Message-Id: <20210723012200.953825-5-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210723012200.953825-1-damien.lemoal@wdc.com> References: <20210723012200.953825-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 --- Documentation/block/queue-sysfs.rst | 30 ++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff --git a/Documentation/block/queue-sysfs.rst b/Documentation/block/queue-sysfs.rst index 4dc7f0d499a8..25f4a768f450 100644 --- a/Documentation/block/queue-sysfs.rst +++ b/Documentation/block/queue-sysfs.rst @@ -4,7 +4,7 @@ Queue sysfs files This text file will detail the queue files that are located in the sysfs tree for each block device. Note that stacked devices typically do not export -any settings, since their queue merely functions are a remapping target. +any settings, since their queue merely functions as a remapping target. These files are the ones found in the /sys/block/xxx/queue/ directory. Files denoted with a RO postfix are readonly and the RW postfix means @@ -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 -- 2.31.1