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,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 B4D64C07E9B for ; Wed, 21 Jul 2021 11:33:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A530610D2 for ; Wed, 21 Jul 2021 11:33:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236460AbhGUKwR (ORCPT ); Wed, 21 Jul 2021 06:52:17 -0400 Received: from esa3.hgst.iphmx.com ([216.71.153.141]:53613 "EHLO esa3.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239000AbhGUKBn (ORCPT ); Wed, 21 Jul 2021 06:01:43 -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=1626864137; x=1658400137; h=from:to:subject:date:message-id:in-reply-to:references: mime-version:content-transfer-encoding; bh=eVdP8gEwYf4LJlTw6lqJ7/xD91dkYaBGnEouf+NGHy0=; b=Ridags+ICRLzVeBAmYoa2Nq2tn6fu9zhh2TSGHl5BbE9AlXmvg8gZJzM seyrLFwED+1htCH4j3+kKiRGBCYLSVuItP7syVO+aDA/3Kpm4z97Wafj1 bo+t+FKTx+jtpBsTw6Po95ZAocgl8oh958NwBp8hmxrMt37Fn0M8uK9RI MS1Yh/t46f4HGgbJr5IQylMuTtWGV/7ktFxsthNwphlLsoXJOnoD4BFx4 382FEN2NizZsQu15FNgzBlwu1Bed2qThVpTFfSSJnmm6u2zQ/NcyBvLiP Dbgnt4w7L+ujuHaef6sP1ymKOIht+xVm0+zdQt7lNeMQySq8YNHevpv6w g==; X-IronPort-AV: E=Sophos;i="5.84,257,1620662400"; d="scan'208";a="179944864" Received: from uls-op-cesaip01.wdc.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 21 Jul 2021 18:42:10 +0800 IronPort-SDR: Wp9IfKAJV7RmcCqBb56iNgxHKjlbO64GLakLhmTZVA1VSnJ5Vhx4uGtpF/OiYFTcpv+YABKLlF 1W3Dbi8E3ZYS0FvRdhhdhF8TBMJansM6aOGqynJ3pDyfSas5PjhBQjQ7larWMFbRihPX7ycxmb tRTVU0BTyHlKYpX9azijUekAiceTRh6/VpFl3uG2aqbf0jMyjiud7obK89TMCrrhyUmhDxcTvR e009g2hMNpxaiRuiQB9PuSiKoCYEew/Ii9jDQJYEp/66CiNg8E8tGrrAExg7QZNPzRIV2TYz5+ nUujgpO5Z3q7Jp1++J+9jFFL 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; 21 Jul 2021 03:20:04 -0700 IronPort-SDR: bTMR8BTD0ma/ePjNUwX7cj+5dpncOyhvfCpEgFIFfzTsk8nP3OoG5ZS10kFmIz2Ty6X51XIusa GO64HUf7asGxV01BE4W6aeSaLSDpV2zo9atgdj+tVrIGxOoHVFvJr7pGPJsH10/yd1+8IufS/Q w0Wl9d7UYwZPPDZj65EOFmjWA4/JtKk1sjcYFEHYmaeauAkw/muXPb9G4EzEZIhbuYiZfAlGfQ JFE3Qyu7Pey83V12d+Bw0wICJxvLnytHQip6cUNOpb/hi9qWAxGRYabJ0GLwbJ3XVOxZEG5Hrq EcQ= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip02.wdc.com with ESMTP; 21 Jul 2021 03:42:10 -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 Subject: [PATCH 2/4] scsi: sd: add concurrent positioning ranges support Date: Wed, 21 Jul 2021 19:42:03 +0900 Message-Id: <20210721104205.885115-3-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210721104205.885115-1-damien.lemoal@wdc.com> References: <20210721104205.885115-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Add the sd_read_cpr() function to the sd scsi disk driver to discover if a device has multiple concurrent positioning ranges (i.e. multiple actuators on an HDD). This new function is called from sd_revalidate_disk() and uses the block layer functions blk_alloc_cranges() and blk_queue_set_cranges() to set a device cranges according to the information retrieved from log page B9h, if the device supports it. The format of the Concurrent Positioning Ranges VPD page B9h is defined in section 6.6.6 of SBC-5. Signed-off-by: Damien Le Moal --- drivers/scsi/sd.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/scsi/sd.h | 1 + 2 files changed, 81 insertions(+) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index b8d55af763f9..b1e767a01b9f 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3125,6 +3125,85 @@ static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer) sdkp->security = 1; } +static inline sector_t sd64_to_sectors(struct scsi_disk *sdkp, u8 *buf) +{ + return logical_to_sectors(sdkp->device, get_unaligned_be64(buf)); +} + +/** + * sd_read_cpr - Query concurrent positioning ranges + * @sdkp: disk to query + */ +static void sd_read_cpr(struct scsi_disk *sdkp) +{ + unsigned char *buffer, *desc; + struct blk_cranges *cr = NULL; + unsigned int nr_cpr = 0; + int i, vpd_len, buf_len = SD_BUF_SIZE; + + /* + * We need to have the capacity set first for the block layer to be + * able to check the ranges. + */ + if (sdkp->first_scan) + return; + + if (!sdkp->capacity) + goto out; + + /* + * Concurrent Positioning Ranges VPD: there can be at most 256 ranges, + * leading to a maximum page size of 64 + 256*32 bytes. + */ + buf_len = 64 + 256*32; + buffer = kmalloc(buf_len, GFP_KERNEL); + if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb9, buffer, buf_len)) + goto out; + + /* We must have at least a 64B header and one 32B range descriptor */ + vpd_len = get_unaligned_be16(&buffer[2]) + 3; + if (vpd_len > buf_len || vpd_len < 64 + 32 || (vpd_len & 31)) { + sd_printk(KERN_ERR, sdkp, + "Invalid Concurrent Positioning Ranges VPD page\n"); + goto out; + } + + nr_cpr = (vpd_len - 64) / 32; + if (nr_cpr == 1) { + nr_cpr = 0; + goto out; + } + + cr = blk_alloc_cranges(sdkp->disk, nr_cpr); + if (!cr) { + nr_cpr = 0; + goto out; + } + + desc = &buffer[64]; + for (i = 0; i < nr_cpr; i++, desc += 32) { + if (desc[0] != i) { + sd_printk(KERN_ERR, sdkp, + "Invalid Concurrent Positioning Range number\n"); + nr_cpr = 0; + break; + } + + cr->ranges[i].sector = sd64_to_sectors(sdkp, desc + 8); + cr->ranges[i].nr_sectors = sd64_to_sectors(sdkp, desc + 16); + } + +out: + blk_queue_set_cranges(sdkp->disk, cr); + if (nr_cpr && sdkp->nr_actuators != nr_cpr) { + sd_printk(KERN_NOTICE, sdkp, + "%u concurrent positioning ranges\n", nr_cpr); + sdkp->nr_actuators = nr_cpr; + } + + kfree(buffer); +} + /* * Determine the device's preferred I/O size for reads and writes * unless the reported value is unreasonably small, large, not a @@ -3240,6 +3319,7 @@ static int sd_revalidate_disk(struct gendisk *disk) sd_read_app_tag_own(sdkp, buffer); sd_read_write_same(sdkp, buffer); sd_read_security(sdkp, buffer); + sd_read_cpr(sdkp); } /* diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h index b59136c4125b..2e5932bde43d 100644 --- a/drivers/scsi/sd.h +++ b/drivers/scsi/sd.h @@ -106,6 +106,7 @@ struct scsi_disk { u8 protection_type;/* Data Integrity Field */ u8 provisioning_mode; u8 zeroing_mode; + u8 nr_actuators; /* Number of actuators */ unsigned ATO : 1; /* state of disk ATO bit */ unsigned cache_override : 1; /* temp override of WCE,RCD */ unsigned WCE : 1; /* state of disk WCE bit */ -- 2.31.1