From patchwork Thu May 11 01:13:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Niklas Cassel X-Patchwork-Id: 681114 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8D245C7EE26 for ; Thu, 11 May 2023 01:20:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236657AbjEKBU2 (ORCPT ); Wed, 10 May 2023 21:20:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50868 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230004AbjEKBUZ (ORCPT ); Wed, 10 May 2023 21:20:25 -0400 Received: from mail-lj1-x22a.google.com (mail-lj1-x22a.google.com [IPv6:2a00:1450:4864:20::22a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A0BF22121; Wed, 10 May 2023 18:20:23 -0700 (PDT) Received: by mail-lj1-x22a.google.com with SMTP id 38308e7fff4ca-2ac785015d7so88252011fa.1; Wed, 10 May 2023 18:20:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683768022; x=1686360022; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:dkim-signature:dkim-signature :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=4rU14LiuFCl4R/CtsScL1JI6loSxXd5fNC08v600PCQ=; b=lbfzOxIxgtn0Ix8JP1gZUU/Lyr9ScjDOR+6a4tIPLrMS8uTviYrJ1g+3GHZTm14CmS XYsfSoBRj4g/cuY93tjAeD5LqoRNSzhF/cYmTBJXGq2RHrz8TbjcaCt22vzOI8QhUjPl gEp1TVnflVyfMuU8V56w5Z4iJ5eUZTUbeK7e9/Eqmrf0rCoNpstNKAfFfc4GG0rntIVg jEksPTRTFiVZW5C2g7qz/n6sTO9yoVBjhq3ibhyQulD95BT2ULziEugRp7suLYRVjO3x 0wYcN0Xco40zEIttxwVHml+NVGu0/lHxWTlEF6Gwg3ArHUn0XwICYRPIm7qg86I+3C5K GURA== X-Gm-Message-State: AC+VfDxY6wpBpkhjs64gi8gVHcEujO9zq4vqorMFl1j3eCwRxDjzDJJV cOphkvnaLGv3AfqwqUArX1FbD7g/GM0EzlrZ X-Google-Smtp-Source: ACHHUZ5C7gU5vRWUncKAY4livfjwRRajHYmD0Zf9zS8QJlo312YhoZeB9aM1lrA2vCauO7xC7Li2AA== X-Received: by 2002:ac2:482d:0:b0:4f0:4b3:fb1f with SMTP id 13-20020ac2482d000000b004f004b3fb1fmr2116009lft.6.1683768021806; Wed, 10 May 2023 18:20:21 -0700 (PDT) Received: from flawful.org (c-fcf6e255.011-101-6d6c6d3.bbcust.telenor.se. [85.226.246.252]) by smtp.gmail.com with ESMTPSA id q29-20020ac25a1d000000b004eaf55936eesm915528lfn.233.2023.05.10.18.20.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 May 2023 18:20:21 -0700 (PDT) Received: by flawful.org (Postfix, from userid 112) id 9D3413C7; Thu, 11 May 2023 03:20:20 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=flawful.org; s=mail; t=1683768020; bh=3vXze6CSPuz6IPU6hZzKRYE9LmDrSyFYOqKwiZw+STs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gjJdEn/1xMu8h83BXdAFQoc5aqFBO7WQvuFrzkCefbeIinW6+osGNpUnoo147rzcf 3UhXfBj7R0yVDEHPCLcoOFNAByHNMpMib7WUwILpKtrpqFL9mEnu+inHiaSONoDHeo II1mGg7ROHiFse1ZSUQBgLyWB0opC/uiegjfuSCA= Received: from x1-carbon.. (unknown [64.141.80.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by flawful.org (Postfix) with ESMTPSA id 22186733; Thu, 11 May 2023 03:15:10 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=flawful.org; s=mail; t=1683767713; bh=3vXze6CSPuz6IPU6hZzKRYE9LmDrSyFYOqKwiZw+STs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fhmjE8rYV++A/cjwP33H35KMWEauITQlFqqbJSs24pj/VTcrwCYu4w+RsZCt9S6j/ m99M/aQ+pPjZ/klcnVEvIxKxWjadNanfz6fFF6QP6W70nlSdJvawrPy0zmCLlYxvLZ po+L7w28DOi5Le0ctC3E54/daMIT9CEvxF8lE3xM= From: Niklas Cassel To: Jens Axboe , "Martin K. Petersen" , "James E.J. Bottomley" Cc: Bart Van Assche , Christoph Hellwig , Hannes Reinecke , Damien Le Moal , linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org, linux-block@vger.kernel.org, Niklas Cassel Subject: [PATCH v7 08/19] scsi: detect support for command duration limits Date: Thu, 11 May 2023 03:13:41 +0200 Message-Id: <20230511011356.227789-9-nks@flawful.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230511011356.227789-1-nks@flawful.org> References: <20230511011356.227789-1-nks@flawful.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Damien Le Moal Introduce the function scsi_cdl_check() to detect if a device supports command duration limits (CDL). Support for the READ 16, WRITE 16, READ 32 and WRITE 32 commands are checked using the function scsi_report_opcode() to probe the rwcdlp and cdlp bits as they indicate the mode page defining the command duration limits descriptors that apply to the command being tested. If any of these commands support CDL, the field cdl_supported of struct scsi_device is set to 1 to indicate that the device supports CDL. Support for CDL for a device is advertizes through sysfs using the new cdl_supported device attribute. This attribute value is 1 for a device supporting CDL and 0 otherwise. Signed-off-by: Damien Le Moal Co-developed-by: Niklas Cassel Reviewed-by: Hannes Reinecke Signed-off-by: Niklas Cassel --- Documentation/ABI/testing/sysfs-block-device | 9 +++ drivers/scsi/scsi.c | 81 ++++++++++++++++++++ drivers/scsi/scsi_scan.c | 3 + drivers/scsi/scsi_sysfs.c | 2 + include/scsi/scsi_device.h | 3 + 5 files changed, 98 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-block-device b/Documentation/ABI/testing/sysfs-block-device index 7ac7b19b2f72..ffc3358cba57 100644 --- a/Documentation/ABI/testing/sysfs-block-device +++ b/Documentation/ABI/testing/sysfs-block-device @@ -95,3 +95,12 @@ Description: This file does not exist if the HBA driver does not implement support for the SATA NCQ priority feature, regardless of the device support for this feature. + + +What: /sys/block/*/device/cdl_supported +Date: May, 2023 +KernelVersion: v6.5 +Contact: linux-scsi@vger.kernel.org +Description: + (RO) Indicates if the device supports the command duration + limits feature found in some ATA and SCSI devices. diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 62d9472e08e9..c03814ce23ca 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -570,6 +570,87 @@ int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, } EXPORT_SYMBOL(scsi_report_opcode); +#define SCSI_CDL_CHECK_BUF_LEN 64 + +static bool scsi_cdl_check_cmd(struct scsi_device *sdev, u8 opcode, u16 sa, + unsigned char *buf) +{ + int ret; + u8 cdlp; + + /* Check operation code */ + ret = scsi_report_opcode(sdev, buf, SCSI_CDL_CHECK_BUF_LEN, opcode, sa); + if (ret <= 0) + return false; + + if ((buf[1] & 0x03) != 0x03) + return false; + + /* See SPC-6, one command format of REPORT SUPPORTED OPERATION CODES */ + cdlp = (buf[1] & 0x18) >> 3; + if (buf[0] & 0x01) { + /* rwcdlp == 1 */ + switch (cdlp) { + case 0x01: + /* T2A page */ + return true; + case 0x02: + /* T2B page */ + return true; + } + } else { + /* rwcdlp == 0 */ + switch (cdlp) { + case 0x01: + /* A page */ + return true; + case 0x02: + /* B page */ + return true; + } + } + + return false; +} + +/** + * scsi_cdl_check - Check if a SCSI device supports Command Duration Limits + * @sdev: The device to check + */ +void scsi_cdl_check(struct scsi_device *sdev) +{ + bool cdl_supported; + unsigned char *buf; + + buf = kmalloc(SCSI_CDL_CHECK_BUF_LEN, GFP_KERNEL); + if (!buf) { + sdev->cdl_supported = 0; + return; + } + + /* Check support for READ_16, WRITE_16, READ_32 and WRITE_32 commands */ + cdl_supported = + scsi_cdl_check_cmd(sdev, READ_16, 0, buf) || + scsi_cdl_check_cmd(sdev, WRITE_16, 0, buf) || + scsi_cdl_check_cmd(sdev, VARIABLE_LENGTH_CMD, READ_32, buf) || + scsi_cdl_check_cmd(sdev, VARIABLE_LENGTH_CMD, WRITE_32, buf); + if (cdl_supported) { + /* + * We have CDL support: force the use of READ16/WRITE16. + * READ32 and WRITE32 will be used for devices that support + * the T10_PI_TYPE2_PROTECTION protection type. + */ + sdev->use_16_for_rw = 1; + sdev->use_10_for_rw = 0; + + sdev->cdl_supported = 1; + } else { + sdev->cdl_supported = 0; + } + + kfree(buf); +} + /** * scsi_device_get - get an additional reference to a scsi_device * @sdev: device to get a reference to diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index d217be323cc6..aa13feb17c62 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -1087,6 +1087,8 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, if (sdev->scsi_level >= SCSI_3) scsi_attach_vpd(sdev); + scsi_cdl_check(sdev); + sdev->max_queue_depth = sdev->queue_depth; WARN_ON_ONCE(sdev->max_queue_depth > sdev->budget_map.depth); sdev->sdev_bflags = *bflags; @@ -1624,6 +1626,7 @@ void scsi_rescan_device(struct device *dev) device_lock(dev); scsi_attach_vpd(sdev); + scsi_cdl_check(sdev); if (sdev->handler && sdev->handler->rescan) sdev->handler->rescan(sdev); diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 603e8fcfcb8a..98fcbbf1c1e3 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -670,6 +670,7 @@ sdev_rd_attr (scsi_level, "%d\n"); sdev_rd_attr (vendor, "%.8s\n"); sdev_rd_attr (model, "%.16s\n"); sdev_rd_attr (rev, "%.4s\n"); +sdev_rd_attr (cdl_supported, "%d\n"); static ssize_t sdev_show_device_busy(struct device *dev, struct device_attribute *attr, @@ -1300,6 +1301,7 @@ static struct attribute *scsi_sdev_attrs[] = { &dev_attr_preferred_path.attr, #endif &dev_attr_queue_ramp_up_period.attr, + &dev_attr_cdl_supported.attr, REF_EVT(media_change), REF_EVT(inquiry_change_reported), REF_EVT(capacity_change_reported), diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index c93c5aaf637e..6b8df9e253a0 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -218,6 +218,8 @@ struct scsi_device { unsigned silence_suspend:1; /* Do not print runtime PM related messages */ unsigned no_vpd_size:1; /* No VPD size reported in header */ + unsigned cdl_supported:1; /* Command duration limits supported */ + unsigned int queue_stopped; /* request queue is quiesced */ bool offline_already; /* Device offline message logged */ @@ -364,6 +366,7 @@ extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); extern void scsi_remove_device(struct scsi_device *); extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); void scsi_attach_vpd(struct scsi_device *sdev); +void scsi_cdl_check(struct scsi_device *sdev); extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); extern int __must_check scsi_device_get(struct scsi_device *);