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=-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 34581C4338F for ; Mon, 26 Jul 2021 01:38:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 107B260551 for ; Mon, 26 Jul 2021 01:38:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231466AbhGZA5l (ORCPT ); Sun, 25 Jul 2021 20:57:41 -0400 Received: from esa2.hgst.iphmx.com ([68.232.143.124]:5174 "EHLO esa2.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231419AbhGZA5k (ORCPT ); Sun, 25 Jul 2021 20:57:40 -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=1627263490; x=1658799490; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=+4y6QnO0EX2zdAVAuJf41nc6N7i70ACwJW+ZZfsL8Pk=; b=Ws3ZqJbmX238TXZ9UXqiMMFmaqJqrz0rLZIGc7xR4AYAf5/pgavstJVa 7YSEpMBEfZBZUHXIc3zafVNZk3XbKskXzcYKB0VA9hYbXx6trWMPYbPE3 od90HINJJGs/EmBCMBLtjCRbByUeT8fVKvxAaJCV0coW2Tpls8glBStsJ SxkHr0rnd2lHRM5hLAfSBjuyIVAqbBuYCjrKzl4vlRdiKUdp4mtbCnZQr UL65PTdsBzagR3XWQ2A6BFf6n81xdLMnDtIXKas21VNuWSPmy2isyXkCH LqjHanfXG/nugxbR21lSXHMdfS67D7iQC7SE6Rm/zOIG9zq5ZCybeOmjp w==; X-IronPort-AV: E=Sophos;i="5.84,269,1620662400"; d="scan'208";a="279290737" Received: from h199-255-45-15.hgst.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 26 Jul 2021 09:38:10 +0800 IronPort-SDR: v0JO29SNne3OFOoCca7jmgwboAnXK/k0xQd1RR3Ed3HQ/qT3p9DfBndOXoyB9HnOSzDkEFhdRY D0DtjVbt9q+4eFNJW9fKS9EQxCvrSx9/PEER7TwzbRk2L8GxBEFIiMvujB7f/2PP7KNBaVVeFR T0K6ohid7zxB2flf5QFdPlYirMa/6qbsLK0FNbCz2Dpan33XOT1TPSDrmak7pgX3yGnkH3iHMo MMPDSw1SvcKlxZ/ntKzpWsr5i4u+btwtOFSHrOiFvecVxEkkOrsnJJZiUf+5roKnrTofsxcUyl hpAPxWXVgyVEapsN/3E3pJl6 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; 25 Jul 2021 18:14:09 -0700 IronPort-SDR: V0fHofpYZ52+ogEe8QsTWdMnQ3+IeHLoMlvKEuAEEnc/ZaXYhT1a/Yr4Rn/Gfj5zJ2s2vjzHXb ND0bkfOybERihAIBlMxCgB4GrvEvlYGlV7T4TdFrxg2JuuEIb5sde2IcmVMJBPGYJ65n4BDv5K Sm9MjYITO9bKaZATrOhRDyNh0QJljCLiGmdBjZ62IIduQyJfNrnWZVGd5DKjPRBy6z2yPHkHWy dHnMfbj7upQqSm2I0mgy8yiPLVyd3fplRZTk1ihj/JHPr/RJHNl2NP01Ezg3pnZSwF+aPSkqz8 h6I= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip02.wdc.com with ESMTP; 25 Jul 2021 18:38:09 -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 v3 0/4] Initial support for multi-actuator HDDs Date: Mon, 26 Jul 2021 10:38:02 +0900 Message-Id: <20210726013806.84815-1-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-ide@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. 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 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