From patchwork Mon Feb 15 22:26:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Don Brace X-Patchwork-Id: 12089227 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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 558AEC433DB for ; Mon, 15 Feb 2021 22:28:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 168AA64DF4 for ; Mon, 15 Feb 2021 22:28:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229733AbhBOW2R (ORCPT ); Mon, 15 Feb 2021 17:28:17 -0500 Received: from esa.microchip.iphmx.com ([68.232.153.233]:58784 "EHLO esa.microchip.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229702AbhBOW2Q (ORCPT ); Mon, 15 Feb 2021 17:28:16 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1613428097; x=1644964097; h=subject:from:to:cc:date:message-id:mime-version: content-transfer-encoding; bh=bPEeeX3iM1XATxCG1SFWJDkf4Of310g6wnHUTObj1ds=; b=SB//lVityRsDMBlFCU/ybneJd5ZzmZHAjSHqvuYjtnDaRKoesUaUN8SD l1G8pzocNORYXBe3vAc05p78caDbK5nrIrwtyHQUYgCSb3TGHuOyS4kxB OdR1JccnqQNpDAmhCFKVIEFnzPRAtn6n/xNzbl2GTmLDuWb8p7U8hzZBs 0iCRko0aPCVcgalJGNoxNPLGOL4moyvyCd/eyUNpjiEcJHNvAz9U+taD5 TBvOh9pwglmSvohBwj5rtHk2hF6eO4eqiuYAJdgzP2egf8cLIydD2Is/e 2LbiiUalAG+4mBhDYRytWoBoNqekEFE1SGtwvBkIfv7vRQtT/0ZHkmXvL g==; IronPort-SDR: YKLH9oZooAXlHE1S0DzR0PhRTMq8akRKdyAD3M3C+CqinlHYRr3QMJkph/f6L2eLtNMEvTMvtV 7UsDaN664167m+ASiRLwUTX5/A1BDlkc4JcNUpOhNPyYShOBw0QwpvyxSChf3KdEErGO50qpFg 4d+QXl3Alidg7uVXPS8VjzYQPRJUXVEItBnKd0LOapKQ7mjJlxFRcPPAsPdry4nvCMfwUXlkZR 1IIp/buHJePqEZD7NH053DjIpP6KxqIhuAeCQfkTsDAJ2Gt6aXeihAKxlqweZewLQSWULrBCtG odk= X-IronPort-AV: E=Sophos;i="5.81,181,1610434800"; d="scan'208";a="109288926" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa5.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 15 Feb 2021 15:26:59 -0700 Received: from chn-vm-ex03.mchp-main.com (10.10.85.151) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Mon, 15 Feb 2021 15:26:58 -0700 Received: from [127.0.1.1] (10.10.115.15) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server id 15.1.1979.3 via Frontend Transport; Mon, 15 Feb 2021 15:26:57 -0700 Subject: [PATCH] hpsa: correct dev cmds outstanding for retried cmds From: Don Brace To: , , , , , , , , , CC: Date: Mon, 15 Feb 2021 16:26:57 -0600 Message-ID: <161342801747.29388.13045495968308188518.stgit@brunhilda> User-Agent: StGit/0.23-dirty MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Prevent incrementing device->commands_outstanding for ioaccel command retries that are driver initiated. If the command goes through the retry path, the device->commands_outstanding counter has already accounted for the number of commands outstanding to the device. Only commands going through function hpsa_cmd_resolve_events decrement this counter. * ioaccel commands go to either HBA disks or to logical volumes comprised of SSDs. The extra increment is causing device resets to hang. * Resets wait for all device outstanding commands to complete before returning. Replace unused field abort_pending with retry_pending. This is a maintenance driver so these changes have the least impact/risk. Tested-by: Joe Szczypek Reviewed-by: Scott Benesh Reviewed-by: Scott Teel Reviewed-by: Tomas Henzl Signed-off-by: Don Brace --- drivers/scsi/hpsa.c | 51 +++++++++++++++++++++++++++++++++++++++++------ drivers/scsi/hpsa_cmd.h | 2 +- 2 files changed, 45 insertions(+), 8 deletions(-) diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c index 337d3aa91945..38369766511c 100644 --- a/drivers/scsi/hpsa.c +++ b/drivers/scsi/hpsa.c @@ -1151,7 +1151,10 @@ static void __enqueue_cmd_and_start_io(struct ctlr_info *h, { dial_down_lockup_detection_during_fw_flash(h, c); atomic_inc(&h->commands_outstanding); - if (c->device) + /* + * Check to see if the command is being retried. + */ + if (c->device && !c->retry_pending) atomic_inc(&c->device->commands_outstanding); reply_queue = h->reply_map[raw_smp_processor_id()]; @@ -5567,7 +5570,8 @@ static inline void hpsa_cmd_partial_init(struct ctlr_info *h, int index, } static int hpsa_ioaccel_submit(struct ctlr_info *h, - struct CommandList *c, struct scsi_cmnd *cmd) + struct CommandList *c, struct scsi_cmnd *cmd, + bool retry) { struct hpsa_scsi_dev_t *dev = cmd->device->hostdata; int rc = IO_ACCEL_INELIGIBLE; @@ -5584,18 +5588,22 @@ static int hpsa_ioaccel_submit(struct ctlr_info *h, cmd->host_scribble = (unsigned char *) c; if (dev->offload_enabled) { - hpsa_cmd_init(h, c->cmdindex, c); + hpsa_cmd_init(h, c->cmdindex, c); /* Zeroes out all fields */ c->cmd_type = CMD_SCSI; c->scsi_cmd = cmd; c->device = dev; + if (retry) /* Resubmit but do not increment device->commands_outstanding. */ + c->retry_pending = true; rc = hpsa_scsi_ioaccel_raid_map(h, c); if (rc < 0) /* scsi_dma_map failed. */ rc = SCSI_MLQUEUE_HOST_BUSY; } else if (dev->hba_ioaccel_enabled) { - hpsa_cmd_init(h, c->cmdindex, c); + hpsa_cmd_init(h, c->cmdindex, c); /* Zeroes out all fields */ c->cmd_type = CMD_SCSI; c->scsi_cmd = cmd; c->device = dev; + if (retry) /* Resubmit but do not increment device->commands_outstanding. */ + c->retry_pending = true; rc = hpsa_scsi_ioaccel_direct_map(h, c); if (rc < 0) /* scsi_dma_map failed. */ rc = SCSI_MLQUEUE_HOST_BUSY; @@ -5628,7 +5636,8 @@ static void hpsa_command_resubmit_worker(struct work_struct *work) if (c2->error_data.serv_response == IOACCEL2_STATUS_SR_TASK_COMP_SET_FULL) { - rc = hpsa_ioaccel_submit(h, c, cmd); + /* Resubmit with the retry_pending flag set. */ + rc = hpsa_ioaccel_submit(h, c, cmd, true); if (rc == 0) return; if (rc == SCSI_MLQUEUE_HOST_BUSY) { @@ -5644,6 +5653,15 @@ static void hpsa_command_resubmit_worker(struct work_struct *work) } } hpsa_cmd_partial_init(c->h, c->cmdindex, c); + /* + * Here we have not come in though queue_command, so we + * can set the retry_pending flag to true for a driver initiated + * retry attempt (I.E. not a SML retry). + * I.E. We are submitting a driver initiated retry. + * Note: hpsa_ciss_submit does not zero out the command fields like + * ioaccel submit does. + */ + c->retry_pending = true; if (hpsa_ciss_submit(c->h, c, cmd, dev)) { /* * If we get here, it means dma mapping failed. Try @@ -5706,11 +5724,16 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd) /* * Call alternate submit routine for I/O accelerated commands. * Retries always go down the normal I/O path. + * Note: If cmd->retries is non-zero, then this is a SML + * initiated retry and not a driver initiated retry. + * This command has been obtained from cmd_tagged_alloc + * and is therefore a brand-new command. */ if (likely(cmd->retries == 0 && !blk_rq_is_passthrough(cmd->request) && h->acciopath_status)) { - rc = hpsa_ioaccel_submit(h, c, cmd); + /* Submit with the retry_pending flag unset. */ + rc = hpsa_ioaccel_submit(h, c, cmd, false); if (rc == 0) return 0; if (rc == SCSI_MLQUEUE_HOST_BUSY) { @@ -6105,6 +6128,7 @@ static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd) * at init, and managed by cmd_tagged_alloc() and cmd_tagged_free() using the * block request tag as an index into a table of entries. cmd_tagged_free() is * the complement, although cmd_free() may be called instead. + * This function is only called for new requests from queue_command. */ static struct CommandList *cmd_tagged_alloc(struct ctlr_info *h, struct scsi_cmnd *scmd) @@ -6139,8 +6163,14 @@ static struct CommandList *cmd_tagged_alloc(struct ctlr_info *h, } atomic_inc(&c->refcount); - hpsa_cmd_partial_init(h, idx, c); + + /* + * This is a new command obtained from queue_command so + * there have not been any driver initiated retry attempts. + */ + c->retry_pending = false; + return c; } @@ -6208,6 +6238,13 @@ static struct CommandList *cmd_alloc(struct ctlr_info *h) } hpsa_cmd_partial_init(h, i, c); c->device = NULL; + + /* + * cmd_alloc is for "internal" commands and they are never + * retried. + */ + c->retry_pending = false; + return c; } diff --git a/drivers/scsi/hpsa_cmd.h b/drivers/scsi/hpsa_cmd.h index 46df2e3ff89b..d126bb877250 100644 --- a/drivers/scsi/hpsa_cmd.h +++ b/drivers/scsi/hpsa_cmd.h @@ -448,7 +448,7 @@ struct CommandList { */ struct hpsa_scsi_dev_t *phys_disk; - int abort_pending; + bool retry_pending; struct hpsa_scsi_dev_t *device; atomic_t refcount; /* Must be last to avoid memset in hpsa_cmd_init() */ } __aligned(COMMANDLIST_ALIGNMENT);