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[2620:137:e000::1:20]) by mx.google.com with ESMTP id x19-20020a05640226d300b0043dfc949d31si2687906edd.25.2022.10.25.02.53.32; Tue, 25 Oct 2022 02:53:56 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=huawei.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230025AbiJYJsm (ORCPT + 99 others); Tue, 25 Oct 2022 05:48:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33026 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231614AbiJYJsN (ORCPT ); Tue, 25 Oct 2022 05:48:13 -0400 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 03A91111B99; Tue, 25 Oct 2022 02:48:12 -0700 (PDT) Received: from fraeml703-chm.china.huawei.com (unknown [172.18.147.226]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4MxRqW5gcqz67xV0; Tue, 25 Oct 2022 17:44:39 +0800 (CST) Received: from lhrpeml500003.china.huawei.com (7.191.162.67) by fraeml703-chm.china.huawei.com (10.206.15.52) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2375.31; Tue, 25 Oct 2022 11:48:09 +0200 Received: from localhost.localdomain (10.69.192.58) by lhrpeml500003.china.huawei.com (7.191.162.67) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Tue, 25 Oct 2022 10:48:05 +0100 From: John Garry To: , , , , , , , , , CC: , , , , , John Garry Subject: [PATCH RFC v3 04/22] scsi: core: Add support to send reserved commands Date: Tue, 25 Oct 2022 18:17:58 +0800 Message-ID: <1666693096-180008-5-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1666693096-180008-1-git-send-email-john.garry@huawei.com> References: <1666693096-180008-1-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.69.192.58] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To lhrpeml500003.china.huawei.com (7.191.162.67) X-CFilter-Loop: Reflected X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_MED, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747652849357371853?= X-GMAIL-MSGID: =?utf-8?q?1747652849357371853?= Add a method to queue reserved commands. Signed-off-by: John Garry --- drivers/scsi/hosts.c | 6 ++++++ drivers/scsi/scsi_lib.c | 25 +++++++++++++++++++++++++ include/scsi/scsi_host.h | 1 + 3 files changed, 32 insertions(+) diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index db89afc37bc9..78968553089f 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -230,6 +230,12 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, goto fail; } + if (shost->nr_reserved_cmds && !sht->reserved_queuecommand) { + shost_printk(KERN_ERR, shost, + "nr_reserved_cmds set but no method to queue\n"); + goto fail; + } + /* Use min_t(int, ...) in case shost->can_queue exceeds SHRT_MAX */ shost->cmd_per_lun = min_t(int, shost->cmd_per_lun, shost->can_queue); diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index a8c4e7c037ae..08015c42c326 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1428,6 +1428,16 @@ static void scsi_complete(struct request *rq) struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq); enum scsi_disposition disposition; + if (blk_mq_is_reserved_rq(rq)) { + struct scsi_device *sdev = cmd->device; + + scsi_mq_uninit_cmd(cmd); + scsi_device_unbusy(sdev, cmd); + __blk_mq_end_request(rq, 0); + + return; + } + INIT_LIST_HEAD(&cmd->eh_entry); atomic_inc(&cmd->device->iodone_cnt); @@ -1718,6 +1728,21 @@ static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx, blk_status_t ret; int reason; + if (blk_mq_is_reserved_rq(req)) { + if (!(req->rq_flags & RQF_DONTPREP)) { + ret = scsi_prepare_cmd(req); + if (ret != BLK_STS_OK) + goto out_dec_host_busy; + + req->rq_flags |= RQF_DONTPREP; + } else { + clear_bit(SCMD_STATE_COMPLETE, &cmd->state); + } + blk_mq_start_request(req); + + return shost->hostt->reserved_queuecommand(shost, cmd); + } + WARN_ON_ONCE(cmd->budget_token < 0); /* diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 91678c77398e..a39f36aa0b0d 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -73,6 +73,7 @@ struct scsi_host_template { * STATUS: REQUIRED */ int (* queuecommand)(struct Scsi_Host *, struct scsi_cmnd *); + int (*reserved_queuecommand)(struct Scsi_Host *, struct scsi_cmnd *); /* * The commit_rqs function is used to trigger a hardware