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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 C5212C43219 for ; Thu, 2 May 2019 00:58:42 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 43BD12081C for ; Thu, 2 May 2019 00:58:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 43BD12081C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 44vcMh3tsRzDqV7 for ; Thu, 2 May 2019 10:58:40 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=linux.ibm.com (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=tyreld@linux.ibm.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.ibm.com Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 44vc783bbLzDqDd for ; Thu, 2 May 2019 10:47:42 +1000 (AEST) Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x420kd0Q037444 for ; Wed, 1 May 2019 20:47:38 -0400 Received: from e13.ny.us.ibm.com (e13.ny.us.ibm.com [129.33.205.203]) by mx0a-001b2d01.pphosted.com with ESMTP id 2s7j5axw34-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 01 May 2019 20:47:38 -0400 Received: from localhost by e13.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 2 May 2019 01:47:34 +0100 Received: from b01ledav001.gho.pok.ibm.com (b01ledav001.gho.pok.ibm.com [9.57.199.106]) by b01cxnp23033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x420lX5133489066 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 2 May 2019 00:47:33 GMT Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B89CF28060; Thu, 2 May 2019 00:47:33 +0000 (GMT) Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 30B7D28058; Thu, 2 May 2019 00:47:33 +0000 (GMT) Received: from ltcalpine2-lp11.aus.stglabs.ibm.com (unknown [9.40.195.194]) by b01ledav001.gho.pok.ibm.com (Postfix) with ESMTP; Thu, 2 May 2019 00:47:33 +0000 (GMT) From: Tyrel Datwyler To: james.bottomley@hansenpartnership.com Subject: [PATCH 2/3] ibmvscsi: redo driver work thread to use enum action states Date: Wed, 1 May 2019 19:47:28 -0500 X-Mailer: git-send-email 2.18.1 In-Reply-To: <20190502004729.19962-1-tyreld@linux.ibm.com> References: <20190502004729.19962-1-tyreld@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19050200-0064-0000-0000-000003D54504 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00011032; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000285; SDB=6.01197265; UDB=6.00627943; IPR=6.00978119; MB=3.00026688; MTD=3.00000008; XFM=3.00000015; UTC=2019-05-02 00:47:36 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19050200-0065-0000-0000-00003D495A80 Message-Id: <20190502004729.19962-2-tyreld@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-05-01_11:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=805 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905020004 X-Mailman-Approved-At: Thu, 02 May 2019 10:55:59 +1000 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tyrel Datwyler , martin.petersen@oracle.com, linux-scsi@vger.kernel.org, Tyrel Datwyler , brking@linux.ibm.com, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Tyrel Datwyler The current implemenation relies on two flags in the drivers private host structure to signal the need for a host reset or to reenable the CRQ after a LPAR migration. This patch does away with those flags and introduces a single action flag and defined enums for the supported kthread work actions. Lastly, the if/else logic is replaced with a switch statement. Signed-off-by: Tyrel Datwyler --- drivers/scsi/ibmvscsi/ibmvscsi.c | 57 +++++++++++++++++++++----------- drivers/scsi/ibmvscsi/ibmvscsi.h | 9 +++-- 2 files changed, 45 insertions(+), 21 deletions(-) diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c index 1c37244f16a0..683139e6c63f 100644 --- a/drivers/scsi/ibmvscsi/ibmvscsi.c +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c @@ -828,7 +828,7 @@ static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) atomic_set(&hostdata->request_limit, 0); purge_requests(hostdata, DID_ERROR); - hostdata->reset_crq = 1; + hostdata->action = IBMVSCSI_HOST_ACTION_RESET; wake_up(&hostdata->work_wait_q); } @@ -1797,7 +1797,7 @@ static void ibmvscsi_handle_crq(struct viosrp_crq *crq, /* We need to re-setup the interpartition connection */ dev_info(hostdata->dev, "Re-enabling adapter!\n"); hostdata->client_migrated = 1; - hostdata->reenable_crq = 1; + hostdata->action = IBMVSCSI_HOST_ACTION_REENABLE; purge_requests(hostdata, DID_REQUEUE); wake_up(&hostdata->work_wait_q); } else { @@ -2118,26 +2118,32 @@ static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata) { + unsigned long flags; int rc; char *action = "reset"; - if (hostdata->reset_crq) { - smp_rmb(); - hostdata->reset_crq = 0; - + spin_lock_irqsave(hostdata->host->host_lock, flags); + switch (hostdata->action) { + case IBMVSCSI_HOST_ACTION_NONE: + break; + case IBMVSCSI_HOST_ACTION_RESET: rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata); if (!rc) rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); vio_enable_interrupts(to_vio_dev(hostdata->dev)); - } else if (hostdata->reenable_crq) { - smp_rmb(); + break; + case IBMVSCSI_HOST_ACTION_REENABLE: action = "enable"; rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata); - hostdata->reenable_crq = 0; if (!rc) rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); - } else - return; + break; + default: + break; + } + + hostdata->action = IBMVSCSI_HOST_ACTION_NONE; + spin_unlock_irqrestore(hostdata->host->host_lock, flags); if (rc) { atomic_set(&hostdata->request_limit, -1); @@ -2147,19 +2153,32 @@ static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata) scsi_unblock_requests(hostdata->host); } -static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) +static int __ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) { if (kthread_should_stop()) return 1; - else if (hostdata->reset_crq) { - smp_rmb(); - return 1; - } else if (hostdata->reenable_crq) { - smp_rmb(); - return 1; + switch (hostdata->action) { + case IBMVSCSI_HOST_ACTION_NONE: + return 0; + case IBMVSCSI_HOST_ACTION_RESET: + case IBMVSCSI_HOST_ACTION_REENABLE: + default: + break; } - return 0; + return 1; +} + +static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) +{ + unsigned long flags; + int rc; + + spin_lock_irqsave(hostdata->host->host_lock, flags); + rc = __ibmvscsi_work_to_do(hostdata); + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + + return rc; } static int ibmvscsi_work(void *data) diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.h b/drivers/scsi/ibmvscsi/ibmvscsi.h index 3a7875575616..04bcbc832dc9 100644 --- a/drivers/scsi/ibmvscsi/ibmvscsi.h +++ b/drivers/scsi/ibmvscsi/ibmvscsi.h @@ -88,13 +88,18 @@ struct event_pool { dma_addr_t iu_token; }; +enum ibmvscsi_host_action { + IBMVSCSI_HOST_ACTION_NONE = 0, + IBMVSCSI_HOST_ACTION_RESET, + IBMVSCSI_HOST_ACTION_REENABLE, +}; + /* all driver data associated with a host adapter */ struct ibmvscsi_host_data { struct list_head host_list; atomic_t request_limit; int client_migrated; - int reset_crq; - int reenable_crq; + enum ibmvscsi_host_action action; struct device *dev; struct event_pool pool; struct crq_queue queue; -- 2.18.1