From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753273AbcFFVWM (ORCPT ); Mon, 6 Jun 2016 17:22:12 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:41262 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752503AbcFFVWK (ORCPT ); Mon, 6 Jun 2016 17:22:10 -0400 From: Christoph Hellwig To: axboe@kernel.dk, keith.busch@intel.com Cc: linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Ming Lin Subject: [PATCH 1/8] blk-mq: add blk_mq_alloc_request_hctx Date: Mon, 6 Jun 2016 23:21:52 +0200 Message-Id: <1465248119-17875-2-git-send-email-hch@lst.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1465248119-17875-1-git-send-email-hch@lst.de> References: <1465248119-17875-1-git-send-email-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ming Lin For some protocols like NVMe over Fabrics we need to be able to send initialization commands to a specific queue. Based on an earlier patch from Christoph Hellwig . Signed-off-by: Ming Lin Signed-off-by: Christoph Hellwig --- block/blk-mq.c | 33 +++++++++++++++++++++++++++++++++ include/linux/blk-mq.h | 2 ++ 2 files changed, 35 insertions(+) diff --git a/block/blk-mq.c b/block/blk-mq.c index 29cbc1b..7bb45ed 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -266,6 +266,39 @@ struct request *blk_mq_alloc_request(struct request_queue *q, int rw, } EXPORT_SYMBOL(blk_mq_alloc_request); +struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int rw, + unsigned int flags, unsigned int hctx_idx) +{ + struct blk_mq_hw_ctx *hctx; + struct blk_mq_ctx *ctx; + struct request *rq; + struct blk_mq_alloc_data alloc_data; + int ret; + + ret = blk_queue_enter(q, flags & BLK_MQ_REQ_NOWAIT); + if (ret) + return ERR_PTR(ret); + + hctx = q->queue_hw_ctx[hctx_idx]; + ctx = __blk_mq_get_ctx(q, cpumask_first(hctx->cpumask)); + + blk_mq_set_alloc_data(&alloc_data, q, flags, ctx, hctx); + + rq = __blk_mq_alloc_request(&alloc_data, rw); + if (!rq && !(flags & BLK_MQ_REQ_NOWAIT)) { + __blk_mq_run_hw_queue(hctx); + + rq = __blk_mq_alloc_request(&alloc_data, rw); + } + if (!rq) { + blk_queue_exit(q); + return ERR_PTR(-EWOULDBLOCK); + } + + return rq; +} +EXPORT_SYMBOL(blk_mq_alloc_request_hctx); + static void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, struct request *rq) { diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 2498fdf..6bf8735 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -196,6 +196,8 @@ enum { struct request *blk_mq_alloc_request(struct request_queue *q, int rw, unsigned int flags); +struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int rw, + unsigned int flags, unsigned int hctx_idx); struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag); struct cpumask *blk_mq_tags_cpumask(struct blk_mq_tags *tags); -- 2.1.4