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=-5.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 E8429C4338F for ; Thu, 12 Aug 2021 17:10:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C697660FD7 for ; Thu, 12 Aug 2021 17:10:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234839AbhHLRLO (ORCPT ); Thu, 12 Aug 2021 13:11:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57832 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234573AbhHLRLN (ORCPT ); Thu, 12 Aug 2021 13:11:13 -0400 Received: from mail-ot1-x32b.google.com (mail-ot1-x32b.google.com [IPv6:2607:f8b0:4864:20::32b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 826CBC061756 for ; Thu, 12 Aug 2021 10:10:48 -0700 (PDT) Received: by mail-ot1-x32b.google.com with SMTP id r16-20020a0568304190b02904f26cead745so8567156otu.10 for ; Thu, 12 Aug 2021 10:10:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=iFS9qOblqQmttFL690SIJWfn2LXx3IsxFKD/wvqpkkY=; b=PTfZTeLU78/zGK/WM3f4bsx4rMtBnFnYfYpRJbX72vZE+Gkg75Gze/9MiZxmVcc21T YivAN5Mkj6AW9M+34NjHtlTQhnmceFoGww778eQgPDfYDwO0V3Dnp3041aIOSlEYfrk8 I1GebLeh0XgUsQIjAHBT9j3vI3nh+QdWrROkw4LSL3CkBdnt/qengmlt5nL6Yg922+oM CQtMJfDL0nhDPG7tiMKg9+7F0SJv1Wcp8tp9Z7ctq2a5u3Xio3JKdlIZ0ToGntbZulX6 wB7XY9NqYzg/rD2Hrba9QKl39RxDOmojNOgqFXMzDPJ0WqkuQpjow2YsPwgyc1WAQJh4 Pjqw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=iFS9qOblqQmttFL690SIJWfn2LXx3IsxFKD/wvqpkkY=; b=f2/qudKbhb1E6+OPwqXjdI73yF+s/ZyxRmtFA9KPLkGsEdn0MIvOaFrDN0Pf57zelQ XMTNfTreplr4rcwVxUZyk7lGUzLtNTCIJHMAK8Y4tO6BEWSzym3Jfllbd9EPnpSfIGCL 0v4DukBUKQtKKgtDPntSPD3R92DREvbDCLZGSGKrrbgaEZofhOR6SkoLt0/sV9Vq0xhw xLhBbeYGNxhGdVZ9O7L77TlIV88+o+KE7AZQN4jkYh1K9JdsmciMSG7FLFpNfDzLxHJb 2RlgObF3X3aG5IOXjStSFPYno3u2hRX572muQ/Q5Lke0NZXzOFLQzEC99KBI5aQEZNW6 PwYw== X-Gm-Message-State: AOAM531N7cmsMnwsm/2MepH4XjFCnk6FYyMuF3YHSVopYPl9xulczl/O 8jx2lvUm+J7j5yzZ2BXTNzwmbQ== X-Google-Smtp-Source: ABdhPJyn1zrVG9sragtzjo/jHG0l9dMVSToslwW+34qJfH5xzLYAsXvt8QSI6wukzEvWuFAtuMe0SQ== X-Received: by 2002:a05:6830:264b:: with SMTP id f11mr4376631otu.8.1628788247900; Thu, 12 Aug 2021 10:10:47 -0700 (PDT) Received: from [192.168.1.30] ([207.135.234.126]) by smtp.gmail.com with ESMTPSA id bf41sm749526oib.41.2021.08.12.10.10.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 12 Aug 2021 10:10:47 -0700 (PDT) Subject: Re: [PATCH v5 0/5] Initial support for multi-actuator HDDs To: Damien Le Moal , linux-block@vger.kernel.org, "Martin K . Petersen" , linux-scsi@vger.kernel.org References: <20210812075015.1090959-1-damien.lemoal@wdc.com> From: Jens Axboe Message-ID: Date: Thu, 12 Aug 2021 11:10:46 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210812075015.1090959-1-damien.lemoal@wdc.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 8/12/21 1:50 AM, Damien Le Moal wrote: > 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. This looks good to me now - are we taking this through the block tree? If so, would be nice to get a SCSI signoff on patch 2. -- Jens Axboe