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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 41D5BC8300C for ; Thu, 30 Apr 2020 13:20:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1B04E2076D for ; Thu, 30 Apr 2020 13:20:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726782AbgD3NUE (ORCPT ); Thu, 30 Apr 2020 09:20:04 -0400 Received: from mx2.suse.de ([195.135.220.15]:60578 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726743AbgD3NUE (ORCPT ); Thu, 30 Apr 2020 09:20:04 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id BAD9AAF01; Thu, 30 Apr 2020 13:20:01 +0000 (UTC) From: Hannes Reinecke To: "Martin K. Petersen" Cc: Christoph Hellwig , James Bottomley , John Garry , Ming Lei , Bart van Assche , linux-scsi@vger.kernel.org, Hannes Reinecke , Hannes Reinecke Subject: [PATCH RFC v3 02/41] scsi: add scsi_{get,put}_reserved_cmd() Date: Thu, 30 Apr 2020 15:18:25 +0200 Message-Id: <20200430131904.5847-3-hare@suse.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20200430131904.5847-1-hare@suse.de> References: <20200430131904.5847-1-hare@suse.de> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Add helper functions to retrieve SCSI commands from the reserved tag pool. Signed-off-by: Hannes Reinecke --- drivers/scsi/scsi_lib.c | 35 +++++++++++++++++++++++++++++++++++ include/scsi/scsi_device.h | 3 +++ 2 files changed, 38 insertions(+) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 5358f553f526..d0972744ea7f 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1901,6 +1901,41 @@ void scsi_mq_destroy_tags(struct Scsi_Host *shost) blk_mq_free_tag_set(&shost->tag_set); } +/** + * scsi_get_reserved_cmd - allocate a SCSI command from reserved tags + * @sdev: SCSI device from which to allocate the command + * @data_direction: Data direction for the allocated command + */ +struct scsi_cmnd *scsi_get_reserved_cmd(struct scsi_device *sdev, + int data_direction) +{ + struct request *rq; + struct scsi_cmnd *scmd; + + rq = blk_mq_alloc_request(sdev->request_queue, + data_direction == DMA_TO_DEVICE ? + REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN | REQ_NOWAIT, + BLK_MQ_REQ_RESERVED); + if (IS_ERR(rq)) + return NULL; + scmd = blk_mq_rq_to_pdu(rq); + scmd->request = rq; + return scmd; +} +EXPORT_SYMBOL_GPL(scsi_get_reserved_cmd); + +/** + * scsi_put_reserved_cmd - free a SCSI command allocated from reserved tags + * @scmd: SCSI command to be freed + */ +void scsi_put_reserved_cmd(struct scsi_cmnd *scmd) +{ + struct request *rq = blk_mq_rq_from_pdu(scmd); + + blk_mq_free_request(rq); +} +EXPORT_SYMBOL_GPL(scsi_put_reserved_cmd); + /** * scsi_device_from_queue - return sdev associated with a request_queue * @q: The request queue to return the sdev from diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index c3cba2aaf934..e74c7e671aa0 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -457,6 +457,9 @@ static inline int scsi_execute_req(struct scsi_device *sdev, return scsi_execute(sdev, cmd, data_direction, buffer, bufflen, NULL, sshdr, timeout, retries, 0, 0, resid); } +struct scsi_cmnd *scsi_get_reserved_cmd(struct scsi_device *sdev, + int data_direction); +void scsi_put_reserved_cmd(struct scsi_cmnd *scmd); extern void sdev_disable_disk_events(struct scsi_device *sdev); extern void sdev_enable_disk_events(struct scsi_device *sdev); extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); -- 2.16.4