From patchwork Wed Oct 27 02:22:18 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: 12586179 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C717DC4332F for ; Wed, 27 Oct 2021 02:22:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B437F60D42 for ; Wed, 27 Oct 2021 02:22:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237846AbhJ0CYu (ORCPT ); Tue, 26 Oct 2021 22:24:50 -0400 Received: from esa5.hgst.iphmx.com ([216.71.153.144]:63763 "EHLO esa5.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236505AbhJ0CYt (ORCPT ); Tue, 26 Oct 2021 22:24:49 -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=1635301345; x=1666837345; h=from:to:subject:date:message-id:mime-version: content-transfer-encoding; bh=qkcdkfnKQ+VIwnl2Cu/kNnIVze3tKolVFa6rlrS0vIo=; b=qUNcfW0SAHf+7yY2wkuDXAAoy9SwuhAlOW+tx+Opt+MPhd86mAl6U/zw 2iJ3hyeUgQqaI2f6/KX0X23F8xD4QEt5dS+A1aTgyUN7ItYNJ2fyWo5MV CxVuhrFCLESjDzgGuQmR9Yn6lT5U2arM+uPyau9sqZI1vyGIaC+T70y2g noQF8P7GXp+QNEmho13+aENhEMKFx2yoTxAVz46xKTy6GFd5ItWtOMCEg XZMQ6ZoF7ruJ9uLgcf+mMGGearD4R1U0ZmKl4Qr0PuCfIl+2QqeAsY2TQ TA61D0aL/GlclMBzgVIsljAH9y7dBYD5974BUjPjWf95Lh8S5IvcB0U1i A==; X-IronPort-AV: E=Sophos;i="5.87,184,1631548800"; d="scan'208";a="183924733" Received: from uls-op-cesaip01.wdc.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 27 Oct 2021 10:22:24 +0800 IronPort-SDR: 5LMXtI3UH7yeNLciy5doXy/SOqesuk7xqZ0C50yCcu0mAomSizdTGzta8rsjuGxHo4y+Swn34m kOFzVh/ah2MRyu0xNssUFfeZkVFyQsT/V3I+VNtugybjUvLaYTJRgHwcgUDHlPrYBD+KIAMNvs D04SA4p7N89OAMa9TgD1gHUKm1M5mur5z2J1MXXk1SADu0vh8Mb7HGLC9Y3T5//V8JCkrpcAmk xFLnftEUKA2aPeM4mapbRH+9FKSZWVzt3ndSzO2wkcbqIavGk88UFEa02V9MmNbFVDYr2/OWoq a++h48VixrQ6TJyy58tahk92 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; 26 Oct 2021 18:57:54 -0700 IronPort-SDR: HGySe0BeOzipMfM2MFHofSspQG5XR6ZwYfQsq+QDnHaUAA8QlUrbOozU2AYL+ekoRJeJCR2hbj rhZKTV8mvA+XYDpn7j+4IgaB8TKqdTBNXaxyEjqUJgmu88nhQD2LVU1M79+RLHOM7NCIatWkgq fjTc8YHYCJS1xv7wgdm2GliRdDEy5+Wol93ntY9Bvd+AwB7ZJslXwaSIhjMGbhVv5i//WHkTR3 Kcc5pk0Dfl/FjqqfeIQoG3pz+XPuIN45LWUifqPokFakanFfbQXe1rmzUDVLiAf2vGXwozaE8e 3yg= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip02.wdc.com with ESMTP; 26 Oct 2021 19:22:25 -0700 From: Damien Le Moal To: Jens Axboe , linux-block@vger.kernel.org, linux-ide@vger.kernel.org, "Martin K . Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH v9 0/5] Initial support for multi-actuator HDDs Date: Wed, 27 Oct 2021 11:22:18 +0900 Message-Id: <20211027022223.183838-1-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Damien Le Moal 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 to 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 schedulers or filesystems). This initial support only exposes the independent access ranges information to user space through sysfs. Changes from v8: * Rebase on latest for-5.16/block tree * Added reviewed-by tags Changes from v7: * Renamed functions to spell out "independent_access_range" instead of using contracted names such as iaranges. Structure fields names are changed to ia_ranges from iaranges. * Added reviewed-by tags in patch 4 and 5 Changes from v6: * Changed patch 1 to prevent a device from registering overlapping independent access ranges. Changes from v5: * Changed type names in patch 1: - struct blk_crange -> sturct blk_independent_access_range - struct blk_cranges -> sturct blk_independent_access_ranges All functions and variables are renamed accordingly, using shorter names related to the new type names, e.g. sturct blk_independent_access_ranges -> iaranges or iars. * Update the commit message of patch 1 to 4. Patch 1 and 4 titles are also changed. * Dropped reviewed-tags on modified patches. Patch 3 and 5 are unmodified Changes from v4: * Fixed kdoc comment function name mismatch for disk_register_cranges() in patch 1 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