From patchwork Mon Feb 15 07:40:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kashyap Desai X-Patchwork-Id: 12088797 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=-17.1 required=3.0 tests=BAYES_00,DATE_IN_PAST_06_12, DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MIME_HEADER_CTYPE_ONLY,SPF_HELO_NONE,SPF_PASS, T_TVD_MIME_NO_HEADERS,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 A8EAAC433E0 for ; Mon, 15 Feb 2021 16:07:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6DFEC64DEB for ; Mon, 15 Feb 2021 16:07:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231217AbhBOQGJ (ORCPT ); Mon, 15 Feb 2021 11:06:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41790 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231837AbhBOPry (ORCPT ); Mon, 15 Feb 2021 10:47:54 -0500 Received: from mail-pf1-x42f.google.com (mail-pf1-x42f.google.com [IPv6:2607:f8b0:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2752FC061788 for ; Mon, 15 Feb 2021 07:40:27 -0800 (PST) Received: by mail-pf1-x42f.google.com with SMTP id m6so4405952pfk.1 for ; Mon, 15 Feb 2021 07:40:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=LdNiwsZULIGa3Xzw3rEQYh7VR2RNwHPKRJ9WXNftR7U=; b=HZakBmha5skIoXOdkyFIqLDFoy9YGwqHXxXegM3UD7p3xZwS0qByzXlNGQOf2AOJJF fKGIRILL4CZzxuvEGEuVYLMPN14LI2csd9jCwKzK02PH1o9yJVAaqwuEIFGT0V/YkA1R 87LVKgUJFchSkV41LBbE8pAT1C4cxrnQCTaXg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=LdNiwsZULIGa3Xzw3rEQYh7VR2RNwHPKRJ9WXNftR7U=; b=C29bw62BqTBp3IHSyawnd8D04LqXnb7QBU3BXVzQo/CIZqr5Kanv90SkG3gaPlmL2+ h/6vZJjsWm28ut4juiYLhJ0yDCtU0LJnoXaL0wT7AxwiPyi38+NylfxKcNldmK/5g9/R m2/HIKjaR2DtoqDijs6BDdwWa8W3aD3GR+z0/LO3HXaUuA7cvAduFiRva8LHzaPC46SS 623k24HrEpmrcaIgRehYIL154PMPX1dbnObb4x6DjS6TZV4Zsfs/rtL60z+9DDagIaXR cHufDQ90uVsV0yyfcumIC4JrT+LkWmvWL07ezTxeveNuctrSuF1OSrHFeHpRfr/PcLd4 Vf0g== X-Gm-Message-State: AOAM533ncAoW2TkG5S/66ZNeFrD0Upu1XSuGPfOGF1edfROlJfUzchcj vCvfEHvsNojii6vBbEFqesipfA== X-Google-Smtp-Source: ABdhPJwOyR1OmAYtMg3aBKut9tJkP7RSLeB0pUovOFWp6vaOsPBbIadW0rTVGJCqPUGyM2YLljXFvw== X-Received: by 2002:a63:df11:: with SMTP id u17mr15142811pgg.345.1613403626618; Mon, 15 Feb 2021 07:40:26 -0800 (PST) Received: from drv-bst-rhel8.dhcp.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id m4sm18031341pgu.4.2021.02.15.07.40.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Feb 2021 07:40:26 -0800 (PST) From: Kashyap Desai To: linux-scsi@vger.kernel.org Cc: Kashyap Desai , sumit.saxena@broadcom.com, chandrakanth.patil@broadcom.com, linux-block@vger.kernel.org Subject: [PATCH v4 1/5] add io_uring with IOPOLL support in scsi layer Date: Mon, 15 Feb 2021 13:10:44 +0530 Message-Id: <20210215074048.19424-2-kashyap.desai@broadcom.com> X-Mailer: git-send-email 2.18.1 In-Reply-To: <20210215074048.19424-1-kashyap.desai@broadcom.com> References: <20210215074048.19424-1-kashyap.desai@broadcom.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org io_uring with IOPOLL is not currently supported in scsi mid layer. Outside of that everything else should work and no extra support in the driver is needed. Currently io_uring with IOPOLL support is only available in block layer. This patch is to extend support of mq_poll in scsi layer. Signed-off-by: Kashyap Desai Reviewed-by: Hannes Reinecke Reviewed-by: John Garry Cc: sumit.saxena@broadcom.com Cc: chandrakanth.patil@broadcom.com Cc: linux-block@vger.kernel.org --- drivers/scsi/scsi_lib.c | 16 ++++++++++++++++ include/scsi/scsi_cmnd.h | 1 + include/scsi/scsi_host.h | 11 +++++++++++ 3 files changed, 28 insertions(+) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index d0ae586565f8..8c29bf0e4cfd 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1789,6 +1789,19 @@ static void scsi_mq_exit_request(struct blk_mq_tag_set *set, struct request *rq, cmd->sense_buffer); } + +static int scsi_mq_poll(struct blk_mq_hw_ctx *hctx) +{ + struct request_queue *q = hctx->queue; + struct scsi_device *sdev = q->queuedata; + struct Scsi_Host *shost = sdev->host; + + if (shost->hostt->mq_poll) + return shost->hostt->mq_poll(shost, hctx->queue_num); + + return 0; +} + static int scsi_map_queues(struct blk_mq_tag_set *set) { struct Scsi_Host *shost = container_of(set, struct Scsi_Host, tag_set); @@ -1856,6 +1869,7 @@ static const struct blk_mq_ops scsi_mq_ops_no_commit = { .cleanup_rq = scsi_cleanup_rq, .busy = scsi_mq_lld_busy, .map_queues = scsi_map_queues, + .poll = scsi_mq_poll, }; @@ -1884,6 +1898,7 @@ static const struct blk_mq_ops scsi_mq_ops = { .cleanup_rq = scsi_cleanup_rq, .busy = scsi_mq_lld_busy, .map_queues = scsi_map_queues, + .poll = scsi_mq_poll, }; struct request_queue *scsi_mq_alloc_queue(struct scsi_device *sdev) @@ -1916,6 +1931,7 @@ int scsi_mq_setup_tags(struct Scsi_Host *shost) else tag_set->ops = &scsi_mq_ops_no_commit; tag_set->nr_hw_queues = shost->nr_hw_queues ? : 1; + tag_set->nr_maps = shost->nr_maps ? : 1; tag_set->queue_depth = shost->can_queue; tag_set->cmd_size = cmd_size; tag_set->numa_node = NUMA_NO_NODE; diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index ace15b5dc956..1d8a0f6ea8c5 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -10,6 +10,7 @@ #include #include #include +#include #include struct Scsi_Host; diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index e30fd963b97d..3d627bf7b951 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -270,6 +270,16 @@ struct scsi_host_template { */ int (* map_queues)(struct Scsi_Host *shost); + /* + * SCSI interface of blk_poll - poll for IO completions. + * Possible interface only if scsi LLD expose multiple h/w queues. + * + * Return value: Number of completed entries found. + * + * Status: OPTIONAL + */ + int (* mq_poll)(struct Scsi_Host *shost, unsigned int queue_num); + /* * Check if scatterlists need to be padded for DMA draining. * @@ -616,6 +626,7 @@ struct Scsi_Host { * the total queue depth is can_queue. */ unsigned nr_hw_queues; + unsigned nr_maps; unsigned active_mode:2; unsigned unchecked_isa_dma:1;