From patchwork Fri Aug 27 07:50:41 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: 12461459 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=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 937E4C43214 for ; Fri, 27 Aug 2021 07:50:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 807E460FF2 for ; Fri, 27 Aug 2021 07:50:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244536AbhH0Hvm (ORCPT ); Fri, 27 Aug 2021 03:51:42 -0400 Received: from esa3.hgst.iphmx.com ([216.71.153.141]:42485 "EHLO esa3.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244495AbhH0Hvi (ORCPT ); Fri, 27 Aug 2021 03:51:38 -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=1630050648; x=1661586648; h=from:to:subject:date:message-id:in-reply-to:references: mime-version:content-transfer-encoding; bh=ISHlTPMJP9UUVggdxZ0huPi7O49JHqjc4UhUHb2wpms=; b=bJIuT6NjZJ3DsZ8St0feOPIxG575pKDyQKw9goEER+XdsxOj5TcIs3xS xSKJDITmVC244td+ZcCan0VjkXAVp6Lwg1tqg49t1KaBUcEsOwPX79w4N HL4+Rdrvqdx9zLH/a/b2fvInVYhiKt7aFnwUxhNpP/HomVaaDi2kNGEJD XBzw3BVweTwGITo4meTPXtC+fQp0Sr66/WHgKcgWrYj+DsbPN/Ms/uvMz +p9VctogLJf7oxY++98R8nauq7aw2ejCN36DK52tfNG2Ko8xBugtrMLae WNiq/UXK3gISFE9BOfklKhw61Uv/+C6no1646T3wxCNLimP5JyvTRv77h w==; X-IronPort-AV: E=Sophos;i="5.84,356,1620662400"; d="scan'208";a="183342788" Received: from uls-op-cesaip02.wdc.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 27 Aug 2021 15:50:48 +0800 IronPort-SDR: xLQLkIVohWynuewzNVreshDi1YszmnQMkpKcY7ulNeeg/PKAn931ryGvC7MkZNIz3cc46PT1MR HKJD8FOAmgZx0RfeDh0EUGNC0UfGuZsgY1+CsSr1l1HnSm8XJdD7u7Jrvjq6ACScF8YPvXIvDr 1ZaOZWGWmLfoQrJIm3QNwWdbCwmnuStYH1t2oXkF39RmD8AColuhex8Q9AhL4hVBtWuS33CgJP SMBgVGBb+pDXD/RQ4fQHODbnVwcyax3KvgBCtYBjZih0atym9Wlin371w5PdrvoXV8eQDqumib 6ABAZpPkdkPk+SJG6IByOAwt 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; 27 Aug 2021 00:26:01 -0700 IronPort-SDR: zZUgMCRPIIOcWSC6nOcWjThdcsg1VhpY72xJlmIxkgrE0vade1Tsd7qCNPx2aDfVRaU1XT91tI x7uNHoZFejJtLL3Le6w48Du1mQnc46JBAHsdXDjc5zdZ1DZ2AUjoLtoOExN3elvtgXKezVZ2AK pg7FyTKri8qDXuBbvnBB5f0kB+MZaWGEkjQ4/NYARkEO+XNiJ8VeKzsdSW2vaOQianeojAyj0k bnlP/PrQIl1zeqnvwwGCL3TM9+5wNP4gWfP+SbT2AG2fpCmu97C2OPyqzLElY1S/+PkmpipT3f qmc= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip02.wdc.com with ESMTP; 27 Aug 2021 00:50:48 -0700 From: Damien Le Moal To: Jens Axboe , linux-block@vger.kernel.org, "Martin K . Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH v6 2/5] scsi: sd: add concurrent positioning ranges support Date: Fri, 27 Aug 2021 16:50:41 +0900 Message-Id: <20210827075045.642269-3-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210827075045.642269-1-damien.lemoal@wdc.com> References: <20210827075045.642269-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@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). The existence of VPD page B9h indicates if a device has multiple concurrent positioning ranges. The page content describes each range supported by the device. sd_read_cpr() is called from sd_revalidate_disk() and uses the block layer functions disk_alloc_iaranges() and disk_set_iaranges() to represent the set of actuators of the device as independent access ranges. 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 | 81 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/scsi/sd.h | 1 + 2 files changed, 82 insertions(+) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 610ebba0d66e..1bb49d74c3db 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3126,6 +3126,86 @@ 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) +{ + struct blk_independent_access_ranges *iars = NULL; + unsigned char *buffer = NULL; + unsigned int nr_cpr = 0; + int i, vpd_len, buf_len = SD_BUF_SIZE; + u8 *desc; + + /* + * 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; + } + + iars = disk_alloc_iaranges(sdkp->disk, nr_cpr); + if (!iars) { + 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; + } + + iars->iarange[i].sector = sd64_to_sectors(sdkp, desc + 8); + iars->iarange[i].nr_sectors = sd64_to_sectors(sdkp, desc + 16); + } + +out: + disk_set_iaranges(sdkp->disk, iars); + 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 @@ -3241,6 +3321,7 @@ 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 */