From patchwork Fri Sep 1 09:41:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wenchao Hao X-Patchwork-Id: 719723 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 5401ACA0FE1 for ; Fri, 1 Sep 2023 09:42:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235597AbjIAJm2 (ORCPT ); Fri, 1 Sep 2023 05:42:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43622 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348939AbjIAJmP (ORCPT ); Fri, 1 Sep 2023 05:42:15 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 86A0F1726; Fri, 1 Sep 2023 02:42:00 -0700 (PDT) Received: from kwepemm600012.china.huawei.com (unknown [172.30.72.57]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4RcY003ytWzVkR3; Fri, 1 Sep 2023 17:39:28 +0800 (CST) Received: from build.huawei.com (10.175.101.6) by kwepemm600012.china.huawei.com (7.193.23.74) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.31; Fri, 1 Sep 2023 17:41:57 +0800 From: Wenchao Hao To: "James E . J . Bottomley" , "Martin K . Petersen" , CC: Hannes Reinecke , , , , Wenchao Hao Subject: [RFC PATCH v2 10/19] scsi: scsi_error: Add helper to handle scsi target's error command list Date: Fri, 1 Sep 2023 17:41:18 +0800 Message-ID: <20230901094127.2010873-11-haowenchao2@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20230901094127.2010873-1-haowenchao2@huawei.com> References: <20230901094127.2010873-1-haowenchao2@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.101.6] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To kwepemm600012.china.huawei.com (7.193.23.74) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Add helper scsi_starget_eh() to handle scsi target's error command list, it would perform some steps which can be done with target's IO blocked, including check sense, start unit, reset lun and reset target. Signed-off-by: Wenchao Hao --- drivers/scsi/scsi_error.c | 129 ++++++++++++++++++++++++++++++++++++++ include/scsi/scsi_eh.h | 2 + 2 files changed, 131 insertions(+) diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index b17bf1dea799..50cd8104175d 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -2547,6 +2547,135 @@ int scsi_sdev_eh(struct scsi_device *sdev, } EXPORT_SYMBOL_GPL(scsi_sdev_eh); +static int starget_eh_stu(struct scsi_target *starget, + struct list_head *work_q, + struct list_head *done_q) +{ + struct scsi_device *sdev; + struct scsi_cmnd *scmd, *stu_scmd; + + list_for_each_entry(sdev, &starget->devices, same_target_siblings) { + if (sdev_stu_done(sdev)) + continue; + + stu_scmd = NULL; + list_for_each_entry(scmd, work_q, eh_entry) + if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && + scsi_check_sense(scmd) == FAILED) { + stu_scmd = scmd; + break; + } + if (!stu_scmd) + continue; + + if (scsi_eh_sdev_stu(stu_scmd, work_q, done_q)) + return 1; + } + + return 0; +} + +static int starget_eh_reset_lun(struct scsi_target *starget, + struct list_head *work_q, + struct list_head *done_q) +{ + struct scsi_device *sdev; + struct scsi_cmnd *scmd, *bdr_scmd; + + list_for_each_entry(sdev, &starget->devices, same_target_siblings) { + if (sdev_reset_done(sdev)) + continue; + + bdr_scmd = NULL; + list_for_each_entry(scmd, work_q, eh_entry) + if (scmd->device) { + bdr_scmd = scmd; + break; + } + if (!bdr_scmd) + continue; + + if (scsi_eh_sdev_reset(bdr_scmd, work_q, done_q)) + return 1; + } + + return 0; +} + +static int starget_eh_reset_target(struct scsi_target *starget, + struct list_head *work_q, + struct list_head *done_q) +{ + enum scsi_disposition rtn; + struct scsi_cmnd *scmd, *next; + LIST_HEAD(check_list); + + scmd = list_first_entry(work_q, struct scsi_cmnd, eh_entry); + + SCSI_LOG_ERROR_RECOVERY(3, starget_printk(KERN_INFO, starget, + "%s: Sending target reset\n", current->comm)); + + rtn = scsi_try_target_reset(scmd); + if (rtn != SUCCESS && rtn != FAST_IO_FAIL) { + SCSI_LOG_ERROR_RECOVERY(3, starget_printk(KERN_INFO, starget, + "%s: Target reset failed\n", + current->comm)); + return 0; + } + + SCSI_LOG_ERROR_RECOVERY(3, starget_printk(KERN_INFO, starget, + "%s: Target reset success\n", current->comm)); + + list_for_each_entry_safe(scmd, next, work_q, eh_entry) { + if (rtn == SUCCESS) + list_move_tail(&scmd->eh_entry, &check_list); + else if (rtn == FAST_IO_FAIL) + scsi_eh_finish_cmd(scmd, done_q); + } + + return scsi_eh_test_devices(&check_list, work_q, done_q, 0); +} + +/* + * Target based error handle + * + * @work_q: list of scsi commands need to recovery + * @done_q: list of scsi commands handled + * + * return: return 1 if all commands in work_q is recoveryed, else 0 is returned + */ +int scsi_starget_eh(struct scsi_target *starget, + struct list_head *work_q, + struct list_head *done_q) +{ + int ret = 0; + + SCSI_LOG_ERROR_RECOVERY(2, starget_printk(KERN_INFO, starget, + "%s:targeteh: checking sense\n", current->comm)); + ret = scsi_eh_get_sense(work_q, done_q); + if (ret) + return ret; + + SCSI_LOG_ERROR_RECOVERY(2, starget_printk(KERN_INFO, starget, + "%s:targeteh: start unit\n", current->comm)); + ret = starget_eh_stu(starget, work_q, done_q); + if (ret) + return ret; + + SCSI_LOG_ERROR_RECOVERY(2, starget_printk(KERN_INFO, starget, + "%s:targeteh reset LUN\n", current->comm)); + ret = starget_eh_reset_lun(starget, work_q, done_q); + if (ret) + return ret; + + SCSI_LOG_ERROR_RECOVERY(2, starget_printk(KERN_INFO, starget, + "%s:targeteh reset target\n", current->comm)); + ret = starget_eh_reset_target(starget, work_q, done_q); + + return ret; +} +EXPORT_SYMBOL_GPL(scsi_starget_eh); + /* * Function: scsi_report_bus_reset() * diff --git a/include/scsi/scsi_eh.h b/include/scsi/scsi_eh.h index 89b471aa484f..80e2f130e884 100644 --- a/include/scsi/scsi_eh.h +++ b/include/scsi/scsi_eh.h @@ -20,6 +20,8 @@ extern bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd, extern enum scsi_disposition scsi_check_sense(struct scsi_cmnd *); extern int scsi_sdev_eh(struct scsi_device *sdev, struct list_head *workq, struct list_head *doneq); +extern int scsi_starget_eh(struct scsi_target *starget, + struct list_head *workq, struct list_head *doneq); extern int scsi_device_setup_eh(struct scsi_device *sdev, int fallback); extern void scsi_device_clear_eh(struct scsi_device *sdev);