From patchwork Tue Nov 26 13:10:08 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hannes Reinecke X-Patchwork-Id: 11262209 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 986DF17F0 for ; Tue, 26 Nov 2019 13:10:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 83E602071E for ; Tue, 26 Nov 2019 13:10:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727533AbfKZNKb (ORCPT ); Tue, 26 Nov 2019 08:10:31 -0500 Received: from mx2.suse.de ([195.135.220.15]:36682 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727088AbfKZNKa (ORCPT ); Tue, 26 Nov 2019 08:10:30 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 8DD27B32A; Tue, 26 Nov 2019 13:10:25 +0000 (UTC) From: Hannes Reinecke To: "Martin K. Petersen" Cc: Christoph Hellwig , James Bottomley , Ming Lei , Bart van Assche , John Garry , linux-scsi@vger.kernel.org, linux-block@vger.kernel.org, Hannes Reinecke Subject: [PATCH 7/8] smartpqi: enable host tagset Date: Tue, 26 Nov 2019 14:10:08 +0100 Message-Id: <20191126131009.71726-8-hare@suse.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20191126131009.71726-1-hare@suse.de> References: <20191126131009.71726-1-hare@suse.de> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Enable host tagset for smartpqi; with this we can use the request tag to look command from the pool avoiding the list iteration in the hot path. Signed-off-by: Hannes Reinecke --- drivers/scsi/smartpqi/smartpqi_init.c | 38 ++++++++++++++++++++++++++--------- 1 file changed, 28 insertions(+), 10 deletions(-) diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c index 7b7ef3acb504..c17b533c84ad 100644 --- a/drivers/scsi/smartpqi/smartpqi_init.c +++ b/drivers/scsi/smartpqi/smartpqi_init.c @@ -575,17 +575,29 @@ static inline void pqi_reinit_io_request(struct pqi_io_request *io_request) } static struct pqi_io_request *pqi_alloc_io_request( - struct pqi_ctrl_info *ctrl_info) + struct pqi_ctrl_info *ctrl_info, struct scsi_cmnd *scmd) { struct pqi_io_request *io_request; + unsigned int limit = PQI_RESERVED_IO_SLOTS; u16 i = ctrl_info->next_io_request_slot; /* benignly racy */ - while (1) { + if (scmd) { + u32 blk_tag = blk_mq_unique_tag(scmd->request); + + i = blk_mq_unique_tag_to_tag(blk_tag) + limit; io_request = &ctrl_info->io_request_pool[i]; - if (atomic_inc_return(&io_request->refcount) == 1) - break; - atomic_dec(&io_request->refcount); - i = (i + 1) % ctrl_info->max_io_slots; + if (WARN_ON(atomic_inc_return(&io_request->refcount) > 1)) { + atomic_dec(&io_request->refcount); + return NULL; + } + } else { + while (1) { + io_request = &ctrl_info->io_request_pool[i]; + if (atomic_inc_return(&io_request->refcount) == 1) + break; + atomic_dec(&io_request->refcount); + i = (i + 1) % limit; + } } /* benignly racy */ @@ -4075,7 +4087,7 @@ static int pqi_submit_raid_request_synchronous(struct pqi_ctrl_info *ctrl_info, atomic_inc(&ctrl_info->sync_cmds_outstanding); - io_request = pqi_alloc_io_request(ctrl_info); + io_request = pqi_alloc_io_request(ctrl_info, NULL); put_unaligned_le16(io_request->index, &(((struct pqi_raid_path_request *)request)->request_id)); @@ -5032,7 +5044,9 @@ static inline int pqi_raid_submit_scsi_cmd(struct pqi_ctrl_info *ctrl_info, { struct pqi_io_request *io_request; - io_request = pqi_alloc_io_request(ctrl_info); + io_request = pqi_alloc_io_request(ctrl_info, scmd); + if (!io_request) + return SCSI_MLQUEUE_HOST_BUSY; return pqi_raid_submit_scsi_cmd_with_io_request(ctrl_info, io_request, device, scmd, queue_group); @@ -5230,7 +5244,10 @@ static int pqi_aio_submit_io(struct pqi_ctrl_info *ctrl_info, struct pqi_io_request *io_request; struct pqi_aio_path_request *request; - io_request = pqi_alloc_io_request(ctrl_info); + io_request = pqi_alloc_io_request(ctrl_info, scmd); + if (!io_request) + return SCSI_MLQUEUE_HOST_BUSY; + io_request->io_complete_callback = pqi_aio_io_complete; io_request->scmd = scmd; io_request->raid_bypass = raid_bypass; @@ -5657,7 +5674,7 @@ static int pqi_lun_reset(struct pqi_ctrl_info *ctrl_info, DECLARE_COMPLETION_ONSTACK(wait); struct pqi_task_management_request *request; - io_request = pqi_alloc_io_request(ctrl_info); + io_request = pqi_alloc_io_request(ctrl_info, NULL); io_request->io_complete_callback = pqi_lun_reset_complete; io_request->context = &wait; @@ -6504,6 +6521,7 @@ static struct scsi_host_template pqi_driver_template = { .map_queues = pqi_map_queues, .sdev_attrs = pqi_sdev_attrs, .shost_attrs = pqi_shost_attrs, + .host_tagset = 1, }; static int pqi_register_scsi(struct pqi_ctrl_info *ctrl_info)