From patchwork Thu Sep 13 12:15:30 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599349 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 164AF14F9 for ; Thu, 13 Sep 2018 12:16:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 06EB62AABC for ; Thu, 13 Sep 2018 12:16:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EED032AAC0; Thu, 13 Sep 2018 12:16:02 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 824852AABD for ; Thu, 13 Sep 2018 12:16:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727365AbeIMRZN (ORCPT ); Thu, 13 Sep 2018 13:25:13 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37674 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727194AbeIMRZN (ORCPT ); Thu, 13 Sep 2018 13:25:13 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id DD4CB3005145; Thu, 13 Sep 2018 12:16:00 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id C1F9F104C529; Thu, 13 Sep 2018 12:15:56 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 01/17] blk-mq: allow to pass default queue flags for creating & initializing queue Date: Thu, 13 Sep 2018 20:15:30 +0800 Message-Id: <20180913121546.5710-2-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.40]); Thu, 13 Sep 2018 12:16:01 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Prepare for converting the flag of BLK_MQ_F_NO_SCHED into per-queue flag, since the following patches need this way for supporting per-host admin queue. Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- block/blk-mq.c | 16 +++++++++------- include/linux/blk-mq.h | 19 ++++++++++++++++--- 2 files changed, 25 insertions(+), 10 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 85a1c1a59c72..d524efc5d1bc 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2476,7 +2476,8 @@ void blk_mq_release(struct request_queue *q) free_percpu(q->queue_ctx); } -struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set) +struct request_queue *__blk_mq_init_queue(struct blk_mq_tag_set *set, + unsigned long def_flags) { struct request_queue *uninit_q, *q; @@ -2484,13 +2485,13 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set) if (!uninit_q) return ERR_PTR(-ENOMEM); - q = blk_mq_init_allocated_queue(set, uninit_q); + q = __blk_mq_init_allocated_queue(set, uninit_q, def_flags); if (IS_ERR(q)) blk_cleanup_queue(uninit_q); return q; } -EXPORT_SYMBOL(blk_mq_init_queue); +EXPORT_SYMBOL(__blk_mq_init_queue); static int blk_mq_hw_ctx_size(struct blk_mq_tag_set *tag_set) { @@ -2564,8 +2565,9 @@ static void blk_mq_realloc_hw_ctxs(struct blk_mq_tag_set *set, blk_mq_sysfs_register(q); } -struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, - struct request_queue *q) +struct request_queue *__blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, + struct request_queue *q, + unsigned long def_flags) { /* mark the queue as mq asap */ q->mq_ops = set->ops; @@ -2599,7 +2601,7 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, q->nr_queues = nr_cpu_ids; - q->queue_flags |= QUEUE_FLAG_MQ_DEFAULT; + q->queue_flags |= def_flags; if (!(set->flags & BLK_MQ_F_SG_MERGE)) queue_flag_set_unlocked(QUEUE_FLAG_NO_SG_MERGE, q); @@ -2649,7 +2651,7 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, q->mq_ops = NULL; return ERR_PTR(-ENOMEM); } -EXPORT_SYMBOL(blk_mq_init_allocated_queue); +EXPORT_SYMBOL(__blk_mq_init_allocated_queue); void blk_mq_free_queue(struct request_queue *q) { diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 1da59c16f637..7f6ecd7b35ce 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -200,9 +200,22 @@ enum { ((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \ << BLK_MQ_F_ALLOC_POLICY_START_BIT) -struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *); -struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, - struct request_queue *q); +struct request_queue *__blk_mq_init_queue(struct blk_mq_tag_set *, unsigned long); +struct request_queue *__blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, + struct request_queue *q, + unsigned long def_flags); + +static inline struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set) +{ + return __blk_mq_init_queue(set, QUEUE_FLAG_MQ_DEFAULT); +} + +static inline struct request_queue * +blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, struct request_queue *q) +{ + return __blk_mq_init_allocated_queue(set, q, QUEUE_FLAG_MQ_DEFAULT); +} + int blk_mq_register_dev(struct device *, struct request_queue *); void blk_mq_unregister_dev(struct device *, struct request_queue *); From patchwork Thu Sep 13 12:15:31 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599351 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6163914BD for ; Thu, 13 Sep 2018 12:16:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4FFAC2AAC0 for ; Thu, 13 Sep 2018 12:16:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 43B7A2AABC; Thu, 13 Sep 2018 12:16:09 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7C4D22AABC for ; Thu, 13 Sep 2018 12:16:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727384AbeIMRZU (ORCPT ); Thu, 13 Sep 2018 13:25:20 -0400 Received: from mx1.redhat.com ([209.132.183.28]:31120 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727194AbeIMRZU (ORCPT ); Thu, 13 Sep 2018 13:25:20 -0400 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.25]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C630666CB8; Thu, 13 Sep 2018 12:16:07 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id 539822010CF7; Thu, 13 Sep 2018 12:16:03 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 02/17] blk-mq: convert BLK_MQ_F_NO_SCHED into per-queue flag Date: Thu, 13 Sep 2018 20:15:31 +0800 Message-Id: <20180913121546.5710-3-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.25 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Thu, 13 Sep 2018 12:16:08 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We need to support admin queue for scsi host, and not like NVMe, this support is only from logic view, and the admin queue still has to share same tags with IO queues. Convert BLK_MQ_F_NO_SCHED into per-queue flag so that we can support admin queue for SCSI. Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- block/blk-mq-debugfs.c | 2 +- block/blk-mq.c | 2 +- block/elevator.c | 3 +-- drivers/block/null_blk_main.c | 7 ++++--- drivers/nvme/host/fc.c | 4 ++-- drivers/nvme/host/pci.c | 4 ++-- drivers/nvme/host/rdma.c | 4 ++-- drivers/nvme/target/loop.c | 4 ++-- include/linux/blk-mq.h | 1 - include/linux/blkdev.h | 5 +++++ 10 files changed, 20 insertions(+), 16 deletions(-) diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index cb1e6cf7ac48..246c9afb6f5d 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -133,6 +133,7 @@ static const char *const blk_queue_flag_name[] = { QUEUE_FLAG_NAME(SCSI_PASSTHROUGH), QUEUE_FLAG_NAME(QUIESCED), QUEUE_FLAG_NAME(PREEMPT_ONLY), + QUEUE_FLAG_NAME(NO_SCHED), }; #undef QUEUE_FLAG_NAME @@ -246,7 +247,6 @@ static const char *const hctx_flag_name[] = { HCTX_FLAG_NAME(TAG_SHARED), HCTX_FLAG_NAME(SG_MERGE), HCTX_FLAG_NAME(BLOCKING), - HCTX_FLAG_NAME(NO_SCHED), }; #undef HCTX_FLAG_NAME diff --git a/block/blk-mq.c b/block/blk-mq.c index d524efc5d1bc..5b56ed306cd9 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2633,7 +2633,7 @@ struct request_queue *__blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, blk_mq_add_queue_tag_set(set, q); blk_mq_map_swqueue(q); - if (!(set->flags & BLK_MQ_F_NO_SCHED)) { + if (!blk_queue_no_sched(q)) { int ret; ret = elevator_init_mq(q); diff --git a/block/elevator.c b/block/elevator.c index 6a06b5d040e5..8fb8754222fa 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -1111,8 +1111,7 @@ static int __elevator_change(struct request_queue *q, const char *name) static inline bool elv_support_iosched(struct request_queue *q) { - if (q->mq_ops && q->tag_set && (q->tag_set->flags & - BLK_MQ_F_NO_SCHED)) + if (q->mq_ops && blk_queue_no_sched(q)) return false; return true; } diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c index 6127e3ff7b4b..5d9504e65725 100644 --- a/drivers/block/null_blk_main.c +++ b/drivers/block/null_blk_main.c @@ -1617,8 +1617,6 @@ static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) set->numa_node = nullb ? nullb->dev->home_node : g_home_node; set->cmd_size = sizeof(struct nullb_cmd); set->flags = BLK_MQ_F_SHOULD_MERGE; - if (g_no_sched) - set->flags |= BLK_MQ_F_NO_SCHED; set->driver_data = NULL; if ((nullb && nullb->dev->blocking) || g_blocking) @@ -1703,6 +1701,9 @@ static int null_add_dev(struct nullb_device *dev) goto out_free_nullb; if (dev->queue_mode == NULL_Q_MQ) { + unsigned long q_flags = g_no_sched ? + QUEUE_FLAG_MQ_NO_SCHED_DEFAULT : QUEUE_FLAG_MQ_DEFAULT; + if (shared_tags) { nullb->tag_set = &tag_set; rv = 0; @@ -1718,7 +1719,7 @@ static int null_add_dev(struct nullb_device *dev) goto out_cleanup_queues; nullb->tag_set->timeout = 5 * HZ; - nullb->q = blk_mq_init_queue(nullb->tag_set); + nullb->q = __blk_mq_init_queue(nullb->tag_set, q_flags); if (IS_ERR(nullb->q)) { rv = -ENOMEM; goto out_cleanup_tags; diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c index 611e70cae754..7048e1444210 100644 --- a/drivers/nvme/host/fc.c +++ b/drivers/nvme/host/fc.c @@ -3034,14 +3034,14 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, ctrl->admin_tag_set.driver_data = ctrl; ctrl->admin_tag_set.nr_hw_queues = 1; ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; - ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; ret = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); if (ret) goto out_free_queues; ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; - ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); + ctrl->ctrl.admin_q = __blk_mq_init_queue(&ctrl->admin_tag_set, + QUEUE_FLAG_MQ_NO_SCHED_DEFAULT); if (IS_ERR(ctrl->ctrl.admin_q)) { ret = PTR_ERR(ctrl->ctrl.admin_q); goto out_free_admin_tag_set; diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index d668682f91df..73a3bd980fc9 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1492,14 +1492,14 @@ static int nvme_alloc_admin_tags(struct nvme_dev *dev) dev->admin_tagset.timeout = ADMIN_TIMEOUT; dev->admin_tagset.numa_node = dev_to_node(dev->dev); dev->admin_tagset.cmd_size = nvme_pci_cmd_size(dev, false); - dev->admin_tagset.flags = BLK_MQ_F_NO_SCHED; dev->admin_tagset.driver_data = dev; if (blk_mq_alloc_tag_set(&dev->admin_tagset)) return -ENOMEM; dev->ctrl.admin_tagset = &dev->admin_tagset; - dev->ctrl.admin_q = blk_mq_init_queue(&dev->admin_tagset); + dev->ctrl.admin_q = __blk_mq_init_queue(&dev->admin_tagset, + QUEUE_FLAG_MQ_NO_SCHED_DEFAULT); if (IS_ERR(dev->ctrl.admin_q)) { blk_mq_free_tag_set(&dev->admin_tagset); return -ENOMEM; diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index dc042017c293..d61c057c0a71 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -692,7 +692,6 @@ static struct blk_mq_tag_set *nvme_rdma_alloc_tagset(struct nvme_ctrl *nctrl, set->driver_data = ctrl; set->nr_hw_queues = 1; set->timeout = ADMIN_TIMEOUT; - set->flags = BLK_MQ_F_NO_SCHED; } else { set = &ctrl->tag_set; memset(set, 0, sizeof(*set)); @@ -770,7 +769,8 @@ static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl, goto out_free_async_qe; } - ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); + ctrl->ctrl.admin_q = __blk_mq_init_queue(&ctrl->admin_tag_set, + QUEUE_FLAG_MQ_NO_SCHED_DEFAULT); if (IS_ERR(ctrl->ctrl.admin_q)) { error = PTR_ERR(ctrl->ctrl.admin_q); goto out_free_tagset; diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c index 9908082b32c4..c689621c2187 100644 --- a/drivers/nvme/target/loop.c +++ b/drivers/nvme/target/loop.c @@ -368,7 +368,6 @@ static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) ctrl->admin_tag_set.driver_data = ctrl; ctrl->admin_tag_set.nr_hw_queues = 1; ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; - ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; ctrl->queues[0].ctrl = ctrl; error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); @@ -381,7 +380,8 @@ static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) goto out_free_sq; ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; - ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); + ctrl->ctrl.admin_q = __blk_mq_init_queue(&ctrl->admin_tag_set, + QUEUE_FLAG_MQ_NO_SCHED_DEFAULT); if (IS_ERR(ctrl->ctrl.admin_q)) { error = PTR_ERR(ctrl->ctrl.admin_q); goto out_free_tagset; diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 7f6ecd7b35ce..afde18ac5b31 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -181,7 +181,6 @@ enum { BLK_MQ_F_TAG_SHARED = 1 << 1, BLK_MQ_F_SG_MERGE = 1 << 2, BLK_MQ_F_BLOCKING = 1 << 5, - BLK_MQ_F_NO_SCHED = 1 << 6, BLK_MQ_F_ALLOC_POLICY_START_BIT = 8, BLK_MQ_F_ALLOC_POLICY_BITS = 1, diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index d6869e0e2b64..a2b110ec422d 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -699,6 +699,7 @@ struct request_queue { #define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */ #define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */ #define QUEUE_FLAG_PREEMPT_ONLY 29 /* only process REQ_PREEMPT requests */ +#define QUEUE_FLAG_NO_SCHED 30 /* no scheduler allowed */ #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ (1 << QUEUE_FLAG_SAME_COMP) | \ @@ -708,6 +709,9 @@ struct request_queue { (1 << QUEUE_FLAG_SAME_COMP) | \ (1 << QUEUE_FLAG_POLL)) +#define QUEUE_FLAG_MQ_NO_SCHED_DEFAULT (QUEUE_FLAG_MQ_DEFAULT | \ + (1 << QUEUE_FLAG_NO_SCHED)) + void blk_queue_flag_set(unsigned int flag, struct request_queue *q); void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); @@ -739,6 +743,7 @@ bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q); #define blk_queue_preempt_only(q) \ test_bit(QUEUE_FLAG_PREEMPT_ONLY, &(q)->queue_flags) #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) +#define blk_queue_no_sched(q) test_bit(QUEUE_FLAG_NO_SCHED, &(q)->queue_flags) extern int blk_set_preempt_only(struct request_queue *q); extern void blk_clear_preempt_only(struct request_queue *q); From patchwork Thu Sep 13 12:15:32 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599357 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 89DAE14F9 for ; Thu, 13 Sep 2018 12:16:17 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7A5F82AABC for ; Thu, 13 Sep 2018 12:16:17 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 62B072AAC0; Thu, 13 Sep 2018 12:16:17 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D24712AABD for ; Thu, 13 Sep 2018 12:16:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727534AbeIMRZ2 (ORCPT ); Thu, 13 Sep 2018 13:25:28 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45464 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727194AbeIMRZ2 (ORCPT ); Thu, 13 Sep 2018 13:25:28 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3AE00C04B920; Thu, 13 Sep 2018 12:16:15 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id 681775D6B5; Thu, 13 Sep 2018 12:16:10 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 03/17] block: rename QUEUE_FLAG_NO_SCHED as QUEUE_FLAG_ADMIN Date: Thu, 13 Sep 2018 20:15:32 +0800 Message-Id: <20180913121546.5710-4-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Thu, 13 Sep 2018 12:16:15 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Now all users of QUEUE_FLAG_NO_SCHED is for admin queue only, and not see any drivers need this flag for IO queue. So rename it as QUEUE_FLAG_ADMIN, which looks more straightforward. Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- block/blk-mq-debugfs.c | 2 +- block/blk-mq.c | 2 +- block/elevator.c | 2 +- drivers/block/null_blk_main.c | 2 +- drivers/nvme/host/fc.c | 2 +- drivers/nvme/host/pci.c | 2 +- drivers/nvme/host/rdma.c | 2 +- drivers/nvme/target/loop.c | 2 +- include/linux/blkdev.h | 8 ++++---- 9 files changed, 12 insertions(+), 12 deletions(-) diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index 246c9afb6f5d..8df013e9f242 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -133,7 +133,7 @@ static const char *const blk_queue_flag_name[] = { QUEUE_FLAG_NAME(SCSI_PASSTHROUGH), QUEUE_FLAG_NAME(QUIESCED), QUEUE_FLAG_NAME(PREEMPT_ONLY), - QUEUE_FLAG_NAME(NO_SCHED), + QUEUE_FLAG_NAME(ADMIN), }; #undef QUEUE_FLAG_NAME diff --git a/block/blk-mq.c b/block/blk-mq.c index 5b56ed306cd9..7868daaf6de0 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2633,7 +2633,7 @@ struct request_queue *__blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, blk_mq_add_queue_tag_set(set, q); blk_mq_map_swqueue(q); - if (!blk_queue_no_sched(q)) { + if (!blk_queue_admin(q)) { int ret; ret = elevator_init_mq(q); diff --git a/block/elevator.c b/block/elevator.c index 8fb8754222fa..d6abba76c89e 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -1111,7 +1111,7 @@ static int __elevator_change(struct request_queue *q, const char *name) static inline bool elv_support_iosched(struct request_queue *q) { - if (q->mq_ops && blk_queue_no_sched(q)) + if (q->mq_ops && blk_queue_admin(q)) return false; return true; } diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c index 5d9504e65725..9fb358007e43 100644 --- a/drivers/block/null_blk_main.c +++ b/drivers/block/null_blk_main.c @@ -1702,7 +1702,7 @@ static int null_add_dev(struct nullb_device *dev) if (dev->queue_mode == NULL_Q_MQ) { unsigned long q_flags = g_no_sched ? - QUEUE_FLAG_MQ_NO_SCHED_DEFAULT : QUEUE_FLAG_MQ_DEFAULT; + QUEUE_FLAG_MQ_ADMIN_DEFAULT : QUEUE_FLAG_MQ_DEFAULT; if (shared_tags) { nullb->tag_set = &tag_set; diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c index 7048e1444210..a920d13c3538 100644 --- a/drivers/nvme/host/fc.c +++ b/drivers/nvme/host/fc.c @@ -3041,7 +3041,7 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; ctrl->ctrl.admin_q = __blk_mq_init_queue(&ctrl->admin_tag_set, - QUEUE_FLAG_MQ_NO_SCHED_DEFAULT); + QUEUE_FLAG_MQ_ADMIN_DEFAULT); if (IS_ERR(ctrl->ctrl.admin_q)) { ret = PTR_ERR(ctrl->ctrl.admin_q); goto out_free_admin_tag_set; diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 73a3bd980fc9..10716a00a6b4 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1499,7 +1499,7 @@ static int nvme_alloc_admin_tags(struct nvme_dev *dev) dev->ctrl.admin_tagset = &dev->admin_tagset; dev->ctrl.admin_q = __blk_mq_init_queue(&dev->admin_tagset, - QUEUE_FLAG_MQ_NO_SCHED_DEFAULT); + QUEUE_FLAG_MQ_ADMIN_DEFAULT); if (IS_ERR(dev->ctrl.admin_q)) { blk_mq_free_tag_set(&dev->admin_tagset); return -ENOMEM; diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index d61c057c0a71..f901b3dafac5 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -770,7 +770,7 @@ static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl, } ctrl->ctrl.admin_q = __blk_mq_init_queue(&ctrl->admin_tag_set, - QUEUE_FLAG_MQ_NO_SCHED_DEFAULT); + QUEUE_FLAG_MQ_ADMIN_DEFAULT); if (IS_ERR(ctrl->ctrl.admin_q)) { error = PTR_ERR(ctrl->ctrl.admin_q); goto out_free_tagset; diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c index c689621c2187..8fca59e6b3c3 100644 --- a/drivers/nvme/target/loop.c +++ b/drivers/nvme/target/loop.c @@ -381,7 +381,7 @@ static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; ctrl->ctrl.admin_q = __blk_mq_init_queue(&ctrl->admin_tag_set, - QUEUE_FLAG_MQ_NO_SCHED_DEFAULT); + QUEUE_FLAG_MQ_ADMIN_DEFAULT); if (IS_ERR(ctrl->ctrl.admin_q)) { error = PTR_ERR(ctrl->ctrl.admin_q); goto out_free_tagset; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index a2b110ec422d..2dbc7524a169 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -699,7 +699,7 @@ struct request_queue { #define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */ #define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */ #define QUEUE_FLAG_PREEMPT_ONLY 29 /* only process REQ_PREEMPT requests */ -#define QUEUE_FLAG_NO_SCHED 30 /* no scheduler allowed */ +#define QUEUE_FLAG_ADMIN 30 /* admin queue */ #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ (1 << QUEUE_FLAG_SAME_COMP) | \ @@ -709,8 +709,8 @@ struct request_queue { (1 << QUEUE_FLAG_SAME_COMP) | \ (1 << QUEUE_FLAG_POLL)) -#define QUEUE_FLAG_MQ_NO_SCHED_DEFAULT (QUEUE_FLAG_MQ_DEFAULT | \ - (1 << QUEUE_FLAG_NO_SCHED)) +#define QUEUE_FLAG_MQ_ADMIN_DEFAULT (QUEUE_FLAG_MQ_DEFAULT | \ + (1 << QUEUE_FLAG_ADMIN)) void blk_queue_flag_set(unsigned int flag, struct request_queue *q); void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); @@ -743,7 +743,7 @@ bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q); #define blk_queue_preempt_only(q) \ test_bit(QUEUE_FLAG_PREEMPT_ONLY, &(q)->queue_flags) #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) -#define blk_queue_no_sched(q) test_bit(QUEUE_FLAG_NO_SCHED, &(q)->queue_flags) +#define blk_queue_admin(q) test_bit(QUEUE_FLAG_ADMIN, &(q)->queue_flags) extern int blk_set_preempt_only(struct request_queue *q); extern void blk_clear_preempt_only(struct request_queue *q); From patchwork Thu Sep 13 12:15:33 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599359 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1CD6D14F9 for ; Thu, 13 Sep 2018 12:16:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0CB272AABC for ; Thu, 13 Sep 2018 12:16:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 009002AABD; Thu, 13 Sep 2018 12:16:21 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8CA662AABD for ; Thu, 13 Sep 2018 12:16:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727689AbeIMRZd (ORCPT ); Thu, 13 Sep 2018 13:25:33 -0400 Received: from mx1.redhat.com ([209.132.183.28]:44660 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727194AbeIMRZc (ORCPT ); Thu, 13 Sep 2018 13:25:32 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 773FB81DE1; Thu, 13 Sep 2018 12:16:20 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id A49F819936; Thu, 13 Sep 2018 12:16:17 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 04/17] blk-mq: don't reserve tags for admin queue Date: Thu, 13 Sep 2018 20:15:33 +0800 Message-Id: <20180913121546.5710-5-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Thu, 13 Sep 2018 12:16:20 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Not necessary to reserve tags for admin queue since there isn't many inflight commands in admin queue usually. This change won't starve admin queue too because each blocked queue has equal priority to get one new tag when one driver tag is released, no matter it is freed from any queue. So that IO performance won't be affected after admin queue(shared tags with IO queues) is introduced in the following patches. Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- block/blk-mq-tag.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index 94e1ed667b6e..7b0390f1c764 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -30,7 +30,8 @@ bool blk_mq_has_free_tags(struct blk_mq_tags *tags) bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx) { if (!test_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state) && - !test_and_set_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state)) + !test_and_set_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state) && + !blk_queue_admin(hctx->queue)) atomic_inc(&hctx->tags->active_queues); return true; @@ -57,7 +58,8 @@ void __blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx) if (!test_and_clear_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state)) return; - atomic_dec(&tags->active_queues); + if (!blk_queue_admin(hctx->queue)) + atomic_dec(&tags->active_queues); blk_mq_tag_wakeup_all(tags, false); } @@ -82,6 +84,12 @@ static inline bool hctx_may_queue(struct blk_mq_hw_ctx *hctx, if (bt->sb.depth == 1) return true; + /* + * Needn't to deal with admin queue specially here even though we + * don't take it account to tags->active_queues, so blk_queue_admin() + * can be avoided to check in the fast path, also with implicit benefit + * of avoiding too many in-flight admin requests + */ users = atomic_read(&hctx->tags->active_queues); if (!users) return true; From patchwork Thu Sep 13 12:15:34 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599365 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7670E14F9 for ; Thu, 13 Sep 2018 12:16:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6805E2AABD for ; Thu, 13 Sep 2018 12:16:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5C7672AACE; Thu, 13 Sep 2018 12:16:28 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DDEAD2AAC0 for ; Thu, 13 Sep 2018 12:16:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727697AbeIMRZj (ORCPT ); Thu, 13 Sep 2018 13:25:39 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41090 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727194AbeIMRZj (ORCPT ); Thu, 13 Sep 2018 13:25:39 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 2660761463; Thu, 13 Sep 2018 12:16:26 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id 19EB760BE0; Thu, 13 Sep 2018 12:16:22 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 05/17] SCSI: try to retrieve request_queue via 'scsi_cmnd' if possible Date: Thu, 13 Sep 2018 20:15:34 +0800 Message-Id: <20180913121546.5710-6-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Thu, 13 Sep 2018 12:16:26 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Prepare for introduing per-host admin queue. The most important part is that the request originated from admin queue can't be called back to the IO queue associated with scsi_device, especially, one request may be requeued, timedout or completed via block layer helper, so what we should do is to use 'scsi_cmnd->request->q' to retrieve the request queue, and pass that to block layer helper, instead of sdev->request_queue. Fortunately most of users of 'scsi_device->request_queue' aren't in related IO path(requeue, timeout, complete, run queue), so the audit isn't more difficult than I thought of. Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- drivers/ata/libata-eh.c | 2 +- drivers/scsi/libsas/sas_ata.c | 2 +- drivers/scsi/libsas/sas_scsi_host.c | 2 +- drivers/scsi/scsi_error.c | 2 +- drivers/scsi/scsi_lib.c | 6 +++--- 5 files changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c index 01306c018398..fbceea6b62a9 100644 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -919,7 +919,7 @@ static void ata_eh_set_pending(struct ata_port *ap, int fastdrain) void ata_qc_schedule_eh(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; - struct request_queue *q = qc->scsicmd->device->request_queue; + struct request_queue *q = qc->scsicmd->request->q; unsigned long flags; WARN_ON(!ap->ops->error_handler); diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c index 64a958a99f6a..fcf46437b756 100644 --- a/drivers/scsi/libsas/sas_ata.c +++ b/drivers/scsi/libsas/sas_ata.c @@ -601,7 +601,7 @@ void sas_ata_task_abort(struct sas_task *task) /* Bounce SCSI-initiated commands to the SCSI EH */ if (qc->scsicmd) { - struct request_queue *q = qc->scsicmd->device->request_queue; + struct request_queue *q = qc->scsicmd->request->q; unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c index 33229348dcb6..91e192f93ae1 100644 --- a/drivers/scsi/libsas/sas_scsi_host.c +++ b/drivers/scsi/libsas/sas_scsi_host.c @@ -933,7 +933,7 @@ void sas_task_abort(struct sas_task *task) if (dev_is_sata(task->dev)) { sas_ata_task_abort(task); } else { - struct request_queue *q = sc->device->request_queue; + struct request_queue *q = sc->request->q; unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index b7a8fdfeb2f4..9f19c80b983c 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -1360,7 +1360,7 @@ static int scsi_eh_try_stu(struct scsi_cmnd *scmd) int i, rtn = NEEDS_RETRY; for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) - rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); + rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->request->q->rq_timeout, 0); if (rtn == SUCCESS) return 0; diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index eb97d2dd3651..6fb8fd3ccc2c 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -168,7 +168,7 @@ static void scsi_mq_requeue_cmd(struct scsi_cmnd *cmd) static void __scsi_queue_insert(struct scsi_cmnd *cmd, int reason, bool unbusy) { struct scsi_device *device = cmd->device; - struct request_queue *q = device->request_queue; + struct request_queue *q = cmd->request->q; unsigned long flags; SCSI_LOG_MLQUEUE(1, scmd_printk(KERN_INFO, cmd, @@ -668,7 +668,7 @@ static bool scsi_end_request(struct request *req, blk_status_t error, { struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req); struct scsi_device *sdev = cmd->device; - struct request_queue *q = sdev->request_queue; + struct request_queue *q = cmd->request->q; if (blk_update_request(req, error, bytes)) return true; @@ -1038,7 +1038,7 @@ static int scsi_io_completion_nz_result(struct scsi_cmnd *cmd, int result, void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) { int result = cmd->result; - struct request_queue *q = cmd->device->request_queue; + struct request_queue *q = cmd->request->q; struct request *req = cmd->request; blk_status_t blk_stat = BLK_STS_OK; From patchwork Thu Sep 13 12:15:35 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599369 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2EE6C14F9 for ; Thu, 13 Sep 2018 12:16:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 20B7E2AABC for ; Thu, 13 Sep 2018 12:16:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 14AB12AABD; Thu, 13 Sep 2018 12:16:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B5C322AABC for ; Thu, 13 Sep 2018 12:16:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727730AbeIMRZm (ORCPT ); Thu, 13 Sep 2018 13:25:42 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37802 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727194AbeIMRZl (ORCPT ); Thu, 13 Sep 2018 13:25:41 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 648BD30842A8; Thu, 13 Sep 2018 12:16:29 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9626560BE0; Thu, 13 Sep 2018 12:16:28 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 06/17] SCSI: pass 'scsi_device' instance from 'scsi_request' Date: Thu, 13 Sep 2018 20:15:35 +0800 Message-Id: <20180913121546.5710-7-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.40]); Thu, 13 Sep 2018 12:16:29 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch prepares for introducing SCSI per-host admin queue, which is only used for queuing admin requests, which are now submitted via __scsi_execute(). Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- drivers/scsi/scsi_lib.c | 2 ++ include/scsi/scsi_request.h | 5 ++++- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 6fb8fd3ccc2c..2800dfae19cd 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -279,6 +279,8 @@ int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, rq->cmd_len = COMMAND_SIZE(cmd[0]); memcpy(rq->cmd, cmd, rq->cmd_len); rq->retries = retries; + rq->sdev = sdev; /* only valid in submit path */ + req->timeout = timeout; req->cmd_flags |= flags; req->rq_flags |= rq_flags | RQF_QUIET; diff --git a/include/scsi/scsi_request.h b/include/scsi/scsi_request.h index b06f28c74908..0de6901b48ab 100644 --- a/include/scsi/scsi_request.h +++ b/include/scsi/scsi_request.h @@ -14,7 +14,10 @@ struct scsi_request { unsigned int sense_len; unsigned int resid_len; /* residual count */ int retries; - void *sense; + union { + void *sense; + struct scsi_device *sdev; + }; }; static inline struct scsi_request *scsi_req(struct request *rq) From patchwork Thu Sep 13 12:15:36 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599373 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9679914F9 for ; Thu, 13 Sep 2018 12:16:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 874062AABC for ; Thu, 13 Sep 2018 12:16:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7BA682AACD; Thu, 13 Sep 2018 12:16:34 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0EC222AABD for ; Thu, 13 Sep 2018 12:16:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727734AbeIMRZp (ORCPT ); Thu, 13 Sep 2018 13:25:45 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52098 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727194AbeIMRZp (ORCPT ); Thu, 13 Sep 2018 13:25:45 -0400 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.24]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E01EF3001873; Thu, 13 Sep 2018 12:16:32 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id 04F2F308BE75; Thu, 13 Sep 2018 12:16:31 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 07/17] SCSI: prepare for introducing admin queue for legacy path Date: Thu, 13 Sep 2018 20:15:36 +0800 Message-Id: <20180913121546.5710-8-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.24 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Thu, 13 Sep 2018 12:16:33 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Uses scsi_is_admin_queue() and scsi_get_scsi_dev() to retrieve 'scsi_device' for legacy path. The same approach can be used in SCSI_MQ path too, just not very efficiently, and will deal with that in the patch when introducing admin queue for SCSI_MQ. Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- drivers/scsi/scsi_lib.c | 37 +++++++++++++++++++++++++++++-------- 1 file changed, 29 insertions(+), 8 deletions(-) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 2800dfae19cd..2f541b4fb32b 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -46,6 +46,20 @@ static DEFINE_MUTEX(scsi_sense_cache_mutex); static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd); +/* For admin queue, its queuedata is NULL */ +static inline bool scsi_is_admin_queue(struct request_queue *q) +{ + return !q->queuedata; +} + +/* This helper can only be used in req prep stage */ +static inline struct scsi_device *scsi_get_scsi_dev(struct request *rq) +{ + if (scsi_is_admin_queue(rq->q)) + return scsi_req(rq)->sdev; + return rq->q->queuedata; +} + static inline struct kmem_cache * scsi_select_sense_cache(bool unchecked_isa_dma) { @@ -1426,10 +1440,9 @@ scsi_prep_state_check(struct scsi_device *sdev, struct request *req) } static int -scsi_prep_return(struct request_queue *q, struct request *req, int ret) +scsi_prep_return(struct scsi_device *sdev, struct request_queue *q, + struct request *req, int ret) { - struct scsi_device *sdev = q->queuedata; - switch (ret) { case BLKPREP_KILL: case BLKPREP_INVALID: @@ -1461,7 +1474,7 @@ scsi_prep_return(struct request_queue *q, struct request *req, int ret) static int scsi_prep_fn(struct request_queue *q, struct request *req) { - struct scsi_device *sdev = q->queuedata; + struct scsi_device *sdev = scsi_get_scsi_dev(req); struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req); int ret; @@ -1486,7 +1499,7 @@ static int scsi_prep_fn(struct request_queue *q, struct request *req) ret = scsi_setup_cmnd(sdev, req); out: - return scsi_prep_return(q, req, ret); + return scsi_prep_return(sdev, q, req, ret); } static void scsi_unprep_fn(struct request_queue *q, struct request *req) @@ -1663,6 +1676,9 @@ static int scsi_lld_busy(struct request_queue *q) if (blk_queue_dying(q)) return 0; + if (WARN_ON_ONCE(scsi_is_admin_queue(q))) + return 0; + shost = sdev->host; /* @@ -1866,7 +1882,7 @@ static void scsi_request_fn(struct request_queue *q) __releases(q->queue_lock) __acquires(q->queue_lock) { - struct scsi_device *sdev = q->queuedata; + struct scsi_device *sdev; struct Scsi_Host *shost; struct scsi_cmnd *cmd; struct request *req; @@ -1875,7 +1891,6 @@ static void scsi_request_fn(struct request_queue *q) * To start with, we keep looping until the queue is empty, or until * the host is no longer able to accept any more requests. */ - shost = sdev->host; for (;;) { int rtn; /* @@ -1887,6 +1902,10 @@ static void scsi_request_fn(struct request_queue *q) if (!req) break; + cmd = blk_mq_rq_to_pdu(req); + sdev = cmd->device; + shost = sdev->host; + if (unlikely(!scsi_device_online(sdev))) { sdev_printk(KERN_ERR, sdev, "rejecting I/O to offline device\n"); @@ -1904,7 +1923,6 @@ static void scsi_request_fn(struct request_queue *q) blk_start_request(req); spin_unlock_irq(q->queue_lock); - cmd = blk_mq_rq_to_pdu(req); if (cmd != req->special) { printk(KERN_CRIT "impossible request in %s.\n" "please mail a stack trace to " @@ -2382,6 +2400,9 @@ struct scsi_device *scsi_device_from_queue(struct request_queue *q) { struct scsi_device *sdev = NULL; + /* admin queue won't be exposed to external users */ + WARN_ON_ONCE(scsi_is_admin_queue(q)); + if (q->mq_ops) { if (q->mq_ops == &scsi_mq_ops) sdev = q->queuedata; From patchwork Thu Sep 13 12:15:37 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599375 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 05305921 for ; Thu, 13 Sep 2018 12:16:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E12062AABC for ; Thu, 13 Sep 2018 12:16:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D2F172AACA; Thu, 13 Sep 2018 12:16:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 87D6A2AABC for ; Thu, 13 Sep 2018 12:16:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727689AbeIMRZv (ORCPT ); Thu, 13 Sep 2018 13:25:51 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39280 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727194AbeIMRZv (ORCPT ); Thu, 13 Sep 2018 13:25:51 -0400 Received: from smtp.corp.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.26]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E65CE30012C7; Thu, 13 Sep 2018 12:16:38 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5973D3091323; Thu, 13 Sep 2018 12:16:35 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 08/17] SCSI: pass scsi_device to scsi_mq_prep_fn Date: Thu, 13 Sep 2018 20:15:37 +0800 Message-Id: <20180913121546.5710-9-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Thu, 13 Sep 2018 12:16:39 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patchset will introduce per-host admin queue, so it may not to get 'scsi_device' via q->queuedata. Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- drivers/scsi/scsi_lib.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 2f541b4fb32b..bc04389de560 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2020,10 +2020,9 @@ static unsigned int scsi_mq_sgl_size(struct Scsi_Host *shost) sizeof(struct scatterlist); } -static int scsi_mq_prep_fn(struct request *req) +static int scsi_mq_prep_fn(struct scsi_device *sdev, struct request *req) { struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req); - struct scsi_device *sdev = req->q->queuedata; struct Scsi_Host *shost = sdev->host; struct scatterlist *sg; @@ -2119,7 +2118,7 @@ static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx, goto out_dec_target_busy; if (!(req->rq_flags & RQF_DONTPREP)) { - ret = prep_to_mq(scsi_mq_prep_fn(req)); + ret = prep_to_mq(scsi_mq_prep_fn(sdev, req)); if (ret != BLK_STS_OK) goto out_dec_host_busy; req->rq_flags |= RQF_DONTPREP; From patchwork Thu Sep 13 12:15:38 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599379 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D632714BD for ; Thu, 13 Sep 2018 12:16:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C646A2AABC for ; Thu, 13 Sep 2018 12:16:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BAC1B2AAC0; Thu, 13 Sep 2018 12:16:43 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 66A282AABC for ; Thu, 13 Sep 2018 12:16:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727745AbeIMRZz (ORCPT ); Thu, 13 Sep 2018 13:25:55 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52212 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727194AbeIMRZz (ORCPT ); Thu, 13 Sep 2018 13:25:55 -0400 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.24]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7CD213091DB3; Thu, 13 Sep 2018 12:16:42 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id 83D85308BDA1; Thu, 13 Sep 2018 12:16:41 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 09/17] SCSI: don't set .queuedata in scsi_mq_alloc_queue() Date: Thu, 13 Sep 2018 20:15:38 +0800 Message-Id: <20180913121546.5710-10-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.24 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Thu, 13 Sep 2018 12:16:42 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP .queuedata is set in scsi_alloc_sdev() for both non-mq and scsi_mq, so not necessary to do it in scsi_mq_alloc_queue(). Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- drivers/scsi/scsi_lib.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index bc04389de560..1072b2e303d9 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2354,7 +2354,6 @@ struct request_queue *scsi_mq_alloc_queue(struct scsi_device *sdev) if (IS_ERR(sdev->request_queue)) return NULL; - sdev->request_queue->queuedata = sdev; __scsi_init_queue(sdev->host, sdev->request_queue); blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, sdev->request_queue); return sdev->request_queue; From patchwork Thu Sep 13 12:15:39 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599383 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 31BEC14F9 for ; Thu, 13 Sep 2018 12:16:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 20B662AABC for ; Thu, 13 Sep 2018 12:16:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 151882AAC2; Thu, 13 Sep 2018 12:16:50 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 701182AABC for ; Thu, 13 Sep 2018 12:16:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727473AbeIMR0B (ORCPT ); Thu, 13 Sep 2018 13:26:01 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59700 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727300AbeIMR0B (ORCPT ); Thu, 13 Sep 2018 13:26:01 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 162DC2C9725; Thu, 13 Sep 2018 12:16:48 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1CEFE60BE0; Thu, 13 Sep 2018 12:16:44 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 10/17] SCSI: deal with admin queue busy Date: Thu, 13 Sep 2018 20:15:39 +0800 Message-Id: <20180913121546.5710-11-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Thu, 13 Sep 2018 12:16:48 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When request originated from admin queue isn't queued successfully, we deal with it just like for normal requests, that said the admin queue will be rerun after one request in this host is completed. Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- drivers/scsi/scsi_lib.c | 61 ++++++++++++++++++++++++++++++++++-------------- include/scsi/scsi_host.h | 2 ++ 2 files changed, 46 insertions(+), 17 deletions(-) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 1072b2e303d9..8d129b601cc5 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -475,10 +475,14 @@ static void scsi_starved_list_run(struct Scsi_Host *shost) LIST_HEAD(starved_list); struct scsi_device *sdev; unsigned long flags; + bool run_admin; spin_lock_irqsave(shost->host_lock, flags); list_splice_init(&shost->starved_list, &starved_list); + run_admin = shost->run_admin_queue; + shost->run_admin_queue = false; + while (!list_empty(&starved_list)) { struct request_queue *slq; @@ -527,6 +531,10 @@ static void scsi_starved_list_run(struct Scsi_Host *shost) /* put any unprocessed entries back */ list_splice(&starved_list, &shost->starved_list); spin_unlock_irqrestore(shost->host_lock, flags); + + /* no need to get queue for admin_q */ + if (run_admin) + scsi_kick_queue(shost->admin_q); } /* @@ -534,26 +542,30 @@ static void scsi_starved_list_run(struct Scsi_Host *shost) * * Purpose: Select a proper request queue to serve next * - * Arguments: q - last request's queue + * Arguments: sdev - the last request's scsi_device + * q - last request's queue, which may points to + * host->admin_q * * Returns: Nothing * * Notes: The previous command was completely finished, start * a new one if possible. */ -static void scsi_run_queue(struct request_queue *q) +static void scsi_run_queue(struct scsi_device *sdev, struct request_queue *q) { - struct scsi_device *sdev = q->queuedata; + struct Scsi_Host *shost = sdev->host; if (scsi_target(sdev)->single_lun) scsi_single_lun_run(sdev); - if (!list_empty(&sdev->host->starved_list)) - scsi_starved_list_run(sdev->host); - if (q->mq_ops) - blk_mq_run_hw_queues(q, false); - else - blk_run_queue(q); + if (!list_empty(&shost->starved_list) || shost->run_admin_queue) + scsi_starved_list_run(shost); + + scsi_kick_queue(q); + + /* q may points to host->admin_queue */ + if (sdev->request_queue != q) + scsi_kick_queue(sdev->request_queue); } void scsi_requeue_run_queue(struct work_struct *work) @@ -563,7 +575,7 @@ void scsi_requeue_run_queue(struct work_struct *work) sdev = container_of(work, struct scsi_device, requeue_work); q = sdev->request_queue; - scsi_run_queue(q); + scsi_run_queue(sdev, q); } /* @@ -597,7 +609,7 @@ static void scsi_requeue_command(struct request_queue *q, struct scsi_cmnd *cmd) blk_requeue_request(q, req); spin_unlock_irqrestore(q->queue_lock, flags); - scsi_run_queue(q); + scsi_run_queue(sdev, q); put_device(&sdev->sdev_gendev); } @@ -607,7 +619,7 @@ void scsi_run_host_queues(struct Scsi_Host *shost) struct scsi_device *sdev; shost_for_each_device(sdev, shost) - scsi_run_queue(sdev->request_queue); + scsi_run_queue(sdev, sdev->request_queue); } static void scsi_uninit_cmd(struct scsi_cmnd *cmd) @@ -715,8 +727,13 @@ static bool scsi_end_request(struct request *req, blk_status_t error, __blk_mq_end_request(req, error); + /* + * scsi_device is shared between host->admin_queue and + * sdev->request_queue + */ if (scsi_target(sdev)->single_lun || - !list_empty(&sdev->host->starved_list)) + !list_empty(&sdev->host->starved_list) || + sdev->host->run_admin_queue || scsi_is_admin_queue(q)) kblockd_schedule_work(&sdev->requeue_work); else blk_mq_run_hw_queues(q, true); @@ -732,7 +749,7 @@ static bool scsi_end_request(struct request *req, blk_status_t error, blk_finish_request(req, error); spin_unlock_irqrestore(q->queue_lock, flags); - scsi_run_queue(q); + scsi_run_queue(sdev, q); } put_device(&sdev->sdev_gendev); @@ -1544,6 +1561,12 @@ static inline int scsi_dev_queue_ready(struct request_queue *q, return 1; out_dec: atomic_dec(&sdev->device_busy); + + if (unlikely(scsi_is_admin_queue(q))) { + spin_lock_irq(sdev->host->host_lock); + sdev->host->run_admin_queue = true; + spin_unlock_irq(sdev->host->host_lock); + } return 0; } @@ -1552,7 +1575,7 @@ static inline int scsi_dev_queue_ready(struct request_queue *q, * @sdev: scsi device on starget to check. */ static inline int scsi_target_queue_ready(struct Scsi_Host *shost, - struct scsi_device *sdev) + struct scsi_device *sdev, bool admin) { struct scsi_target *starget = scsi_target(sdev); unsigned int busy; @@ -1594,6 +1617,8 @@ static inline int scsi_target_queue_ready(struct Scsi_Host *shost, starved: spin_lock_irq(shost->host_lock); list_move_tail(&sdev->starved_entry, &shost->starved_list); + if (admin) + shost->run_admin_queue = true; spin_unlock_irq(shost->host_lock); out_dec: if (starget->can_queue > 0) @@ -1650,6 +1675,8 @@ static inline int scsi_host_queue_ready(struct request_queue *q, spin_lock_irq(shost->host_lock); if (list_empty(&sdev->starved_entry)) list_add_tail(&sdev->starved_entry, &shost->starved_list); + if (scsi_is_admin_queue(q)) + shost->run_admin_queue = true; spin_unlock_irq(shost->host_lock); out_dec: scsi_dec_host_busy(shost); @@ -1949,7 +1976,7 @@ static void scsi_request_fn(struct request_queue *q) goto not_ready; } - if (!scsi_target_queue_ready(shost, sdev)) + if (!scsi_target_queue_ready(shost, sdev, scsi_is_admin_queue(q))) goto not_ready; if (!scsi_host_queue_ready(q, shost, sdev)) @@ -2112,7 +2139,7 @@ static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx, goto out_put_budget; ret = BLK_STS_RESOURCE; - if (!scsi_target_queue_ready(shost, sdev)) + if (!scsi_target_queue_ready(shost, sdev, scsi_is_admin_queue(q))) goto out_put_budget; if (!scsi_host_queue_ready(q, shost, sdev)) goto out_dec_target_busy; diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 5ea06d310a25..4896e6003aeb 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -532,6 +532,8 @@ struct Scsi_Host { struct list_head __devices; struct list_head __targets; + struct request_queue *admin_q; + bool run_admin_queue; struct list_head starved_list; spinlock_t default_lock; From patchwork Thu Sep 13 12:15:40 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599389 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 05B2317DF for ; Thu, 13 Sep 2018 12:16:53 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E86812AABD for ; Thu, 13 Sep 2018 12:16:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DC6892AACA; Thu, 13 Sep 2018 12:16:52 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7D3742AABD for ; Thu, 13 Sep 2018 12:16:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727749AbeIMR0E (ORCPT ); Thu, 13 Sep 2018 13:26:04 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46332 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727300AbeIMR0D (ORCPT ); Thu, 13 Sep 2018 13:26:03 -0400 Received: from smtp.corp.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.26]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4FD6285A05; Thu, 13 Sep 2018 12:16:51 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id 801C03091323; Thu, 13 Sep 2018 12:16:50 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 11/17] SCSI: track pending admin commands Date: Thu, 13 Sep 2018 20:15:40 +0800 Message-Id: <20180913121546.5710-12-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Thu, 13 Sep 2018 12:16:51 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Firstly we have to make sure that all pending admin commands to one same scsi_device are completed before removing the scsi_device. Secondly scsi_internal_device_block() needs this too. So introduce one waitqueue and atomic counter for this purpose. Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- drivers/scsi/scsi_lib.c | 6 ++++++ drivers/scsi/scsi_scan.c | 1 + drivers/scsi/scsi_sysfs.c | 1 + include/scsi/scsi_device.h | 4 ++++ 4 files changed, 12 insertions(+) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 8d129b601cc5..4db08458a127 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -299,6 +299,8 @@ int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, req->cmd_flags |= flags; req->rq_flags |= rq_flags | RQF_QUIET; + atomic_inc(&sdev->nr_admin_pending); + /* * head injection *required* here otherwise quiesce won't work */ @@ -323,6 +325,9 @@ int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, out: blk_put_request(req); + atomic_dec(&sdev->nr_admin_pending); + wake_up_all(&sdev->admin_wq); + return ret; } EXPORT_SYMBOL(__scsi_execute); @@ -3246,6 +3251,7 @@ static int scsi_internal_device_block(struct scsi_device *sdev) else scsi_wait_for_queuecommand(sdev); } + wait_event(sdev->admin_wq, !atomic_read(&sdev->nr_admin_pending)); mutex_unlock(&sdev->state_mutex); return err; diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 78ca63dfba4a..b83ad0dc8890 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -243,6 +243,7 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, mutex_init(&sdev->inquiry_mutex); INIT_WORK(&sdev->event_work, scsi_evt_thread); INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue); + init_waitqueue_head(&sdev->admin_wq); sdev->sdev_gendev.parent = get_device(&starget->dev); sdev->sdev_target = starget; diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 3aee9464a7bf..8bcb7ecc0c06 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -1393,6 +1393,7 @@ void __scsi_remove_device(struct scsi_device *sdev) blk_cleanup_queue(sdev->request_queue); cancel_work_sync(&sdev->requeue_work); + wait_event(sdev->admin_wq, !atomic_read(&sdev->nr_admin_pending)); if (sdev->host->hostt->slave_destroy) sdev->host->hostt->slave_destroy(sdev); diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index 202f4d6a4342..f6820da1dc37 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -227,6 +227,10 @@ struct scsi_device { struct mutex state_mutex; enum scsi_device_state sdev_state; struct task_struct *quiesced_by; + + atomic_t nr_admin_pending; + wait_queue_head_t admin_wq; + unsigned long sdev_data[0]; } __attribute__((aligned(sizeof(unsigned long)))); From patchwork Thu Sep 13 12:15:41 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599393 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 45FF914F9 for ; Thu, 13 Sep 2018 12:17:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 367302AABC for ; Thu, 13 Sep 2018 12:17:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2A3FA2AAC0; Thu, 13 Sep 2018 12:17:00 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B46FD2AABD for ; Thu, 13 Sep 2018 12:16:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727762AbeIMR0J (ORCPT ); Thu, 13 Sep 2018 13:26:09 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49896 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727756AbeIMR0J (ORCPT ); Thu, 13 Sep 2018 13:26:09 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D56BC30820CE; Thu, 13 Sep 2018 12:16:56 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id 06BBB608E6; Thu, 13 Sep 2018 12:16:53 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 12/17] SCSI: create admin queue for each host Date: Thu, 13 Sep 2018 20:15:41 +0800 Message-Id: <20180913121546.5710-13-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.47]); Thu, 13 Sep 2018 12:16:57 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The created admin queue will be used to send internal admin commands, so we can simplify the sync between some admin commands and IO requests, typical examples are system suspend and runtime PM. Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- drivers/scsi/hosts.c | 9 ++++ drivers/scsi/scsi_lib.c | 117 +++++++++++++++++++++++++++++++++++++++++------ drivers/scsi/scsi_priv.h | 1 + 3 files changed, 114 insertions(+), 13 deletions(-) diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index ea4b0bb0c1cd..7c1f56c85475 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -242,6 +242,9 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, shost->dma_dev = dma_dev; + if (!scsi_init_admin_queue(shost)) + goto out_remove_tags; + /* * Increase usage count temporarily here so that calling * scsi_autopm_put_host() will trigger runtime idle if there is @@ -309,6 +312,9 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, pm_runtime_disable(&shost->shost_gendev); pm_runtime_set_suspended(&shost->shost_gendev); pm_runtime_put_noidle(&shost->shost_gendev); + blk_cleanup_queue(shost->admin_q); + blk_put_queue(shost->admin_q); + out_remove_tags: if (shost_use_blk_mq(shost)) scsi_mq_destroy_tags(shost); fail: @@ -344,6 +350,9 @@ static void scsi_host_dev_release(struct device *dev) kfree(dev_name(&shost->shost_dev)); } + blk_cleanup_queue(shost->admin_q); + blk_put_queue(shost->admin_q); + if (shost_use_blk_mq(shost)) { if (shost->tag_set.tags) scsi_mq_destroy_tags(shost); diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 4db08458a127..87a88094b1eb 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2099,19 +2099,22 @@ static void scsi_mq_done(struct scsi_cmnd *cmd) blk_mq_complete_request(cmd->request); } -static void scsi_mq_put_budget(struct blk_mq_hw_ctx *hctx) +static void __scsi_mq_put_budget(struct blk_mq_hw_ctx *hctx, + struct scsi_device *sdev) { - struct request_queue *q = hctx->queue; - struct scsi_device *sdev = q->queuedata; - atomic_dec(&sdev->device_busy); put_device(&sdev->sdev_gendev); } -static bool scsi_mq_get_budget(struct blk_mq_hw_ctx *hctx) +static void scsi_mq_put_budget(struct blk_mq_hw_ctx *hctx) +{ + __scsi_mq_put_budget(hctx, hctx->queue->queuedata); +} + +static bool __scsi_mq_get_budget(struct blk_mq_hw_ctx *hctx, + struct scsi_device *sdev) { struct request_queue *q = hctx->queue; - struct scsi_device *sdev = q->queuedata; if (!get_device(&sdev->sdev_gendev)) goto out; @@ -2128,12 +2131,17 @@ static bool scsi_mq_get_budget(struct blk_mq_hw_ctx *hctx) return false; } -static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx, - const struct blk_mq_queue_data *bd) +static bool scsi_mq_get_budget(struct blk_mq_hw_ctx *hctx) +{ + return __scsi_mq_get_budget(hctx, hctx->queue->queuedata); +} + +static blk_status_t __scsi_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *bd, + struct scsi_device *sdev) { struct request *req = bd->rq; struct request_queue *q = req->q; - struct scsi_device *sdev = q->queuedata; struct Scsi_Host *shost = sdev->host; struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req); blk_status_t ret; @@ -2181,7 +2189,7 @@ static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx, if (scsi_target(sdev)->can_queue > 0) atomic_dec(&scsi_target(sdev)->target_busy); out_put_budget: - scsi_mq_put_budget(hctx); + __scsi_mq_put_budget(hctx, sdev); switch (ret) { case BLK_STS_OK: break; @@ -2203,6 +2211,29 @@ static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx, return ret; } +static blk_status_t scsi_admin_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *bd) +{ + struct scsi_device *sdev = scsi_req(bd->rq)->sdev; + + WARN_ON_ONCE(hctx->queue == sdev->request_queue); + + if (!__scsi_mq_get_budget(hctx, sdev)) + return BLK_STS_RESOURCE; + + return __scsi_queue_rq(hctx, bd, sdev); +} + +static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *bd) +{ + struct scsi_device *sdev = hctx->queue->queuedata; + + WARN_ON_ONCE(hctx->queue == sdev->host->admin_q); + + return __scsi_queue_rq(hctx, bd, hctx->queue->queuedata); +} + static enum blk_eh_timer_return scsi_timeout(struct request *req, bool reserved) { @@ -2335,9 +2366,9 @@ static void scsi_old_exit_rq(struct request_queue *q, struct request *rq) cmd->sense_buffer); } -struct request_queue *scsi_old_alloc_queue(struct scsi_device *sdev) +static struct request_queue *__scsi_old_alloc_queue(struct Scsi_Host *shost, + bool admin) { - struct Scsi_Host *shost = sdev->host; struct request_queue *q; q = blk_alloc_queue_node(GFP_KERNEL, NUMA_NO_NODE, NULL); @@ -2356,7 +2387,9 @@ struct request_queue *scsi_old_alloc_queue(struct scsi_device *sdev) } __scsi_init_queue(shost, q); - blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, q); + + if (!admin) + blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, q); blk_queue_prep_rq(q, scsi_prep_fn); blk_queue_unprep_rq(q, scsi_unprep_fn); blk_queue_softirq_done(q, scsi_softirq_done); @@ -2365,6 +2398,23 @@ struct request_queue *scsi_old_alloc_queue(struct scsi_device *sdev) return q; } +struct request_queue *scsi_old_alloc_queue(struct scsi_device *sdev) +{ + return __scsi_old_alloc_queue(sdev->host, false); +} + +static struct request_queue *scsi_old_alloc_admin_queue(struct Scsi_Host *shost) +{ + struct request_queue *q = __scsi_old_alloc_queue(shost, true); + + if (!q) + return NULL; + + blk_queue_init_tags(q, shost->cmd_per_lun, shost->bqt, + shost->hostt->tag_alloc_policy); + return q; +} + static const struct blk_mq_ops scsi_mq_ops = { .get_budget = scsi_mq_get_budget, .put_budget = scsi_mq_put_budget, @@ -2380,6 +2430,16 @@ static const struct blk_mq_ops scsi_mq_ops = { .map_queues = scsi_map_queues, }; +static const struct blk_mq_ops scsi_mq_admin_ops = { + .queue_rq = scsi_admin_queue_rq, + .complete = scsi_softirq_done, + .timeout = scsi_timeout, + .init_request = scsi_mq_init_request, + .exit_request = scsi_mq_exit_request, + .initialize_rq_fn = scsi_initialize_rq, + .map_queues = scsi_map_queues, +}; + struct request_queue *scsi_mq_alloc_queue(struct scsi_device *sdev) { sdev->request_queue = blk_mq_init_queue(&sdev->host->tag_set); @@ -2391,6 +2451,37 @@ struct request_queue *scsi_mq_alloc_queue(struct scsi_device *sdev) return sdev->request_queue; } +static struct request_queue *scsi_mq_alloc_admin_queue(struct Scsi_Host *shost) +{ + struct request_queue *q = __blk_mq_init_queue(&shost->tag_set, + QUEUE_FLAG_MQ_ADMIN_DEFAULT); + if (IS_ERR(q)) + return NULL; + + q->mq_ops = &scsi_mq_admin_ops; + + __scsi_init_queue(shost, q); + + return q; +} + +struct request_queue *scsi_init_admin_queue(struct Scsi_Host *shost) +{ + struct request_queue *q; + + if (shost_use_blk_mq(shost)) + q = scsi_mq_alloc_admin_queue(shost); + else + q = scsi_old_alloc_admin_queue(shost); + + if (!q) + return NULL; + + WARN_ON(!blk_get_queue(q)); + shost->admin_q = q; + return q; +} + int scsi_mq_setup_tags(struct Scsi_Host *shost) { unsigned int cmd_size, sgl_size; diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h index 99f1db5e467e..0553acbc3f65 100644 --- a/drivers/scsi/scsi_priv.h +++ b/drivers/scsi/scsi_priv.h @@ -94,6 +94,7 @@ extern void scsi_run_host_queues(struct Scsi_Host *shost); extern void scsi_requeue_run_queue(struct work_struct *work); extern struct request_queue *scsi_old_alloc_queue(struct scsi_device *sdev); extern struct request_queue *scsi_mq_alloc_queue(struct scsi_device *sdev); +extern struct request_queue *scsi_init_admin_queue(struct Scsi_Host *shost); extern void scsi_start_queue(struct scsi_device *sdev); extern int scsi_mq_setup_tags(struct Scsi_Host *shost); extern void scsi_mq_destroy_tags(struct Scsi_Host *shost); From patchwork Thu Sep 13 12:15:42 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599395 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CB61714F9 for ; Thu, 13 Sep 2018 12:17:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BABC12AABC for ; Thu, 13 Sep 2018 12:17:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AF2312AAC2; Thu, 13 Sep 2018 12:17:03 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 46E962AABC for ; Thu, 13 Sep 2018 12:17:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727730AbeIMR0P (ORCPT ); Thu, 13 Sep 2018 13:26:15 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33354 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727577AbeIMR0O (ORCPT ); Thu, 13 Sep 2018 13:26:14 -0400 Received: from smtp.corp.redhat.com (int-mx12.intmail.prod.int.phx2.redhat.com [10.5.11.27]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 2C3DC300286B; Thu, 13 Sep 2018 12:17:02 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3D65874BB9; Thu, 13 Sep 2018 12:16:58 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 13/17] SCSI: use the dedicated admin queue to send admin commands Date: Thu, 13 Sep 2018 20:15:42 +0800 Message-Id: <20180913121546.5710-14-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.27 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Thu, 13 Sep 2018 12:17:02 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Now the per-host dedicated admin queue is ready, so use this queue to send admin commands only. Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- drivers/scsi/scsi_lib.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 87a88094b1eb..1e75515cc7ba 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -279,14 +279,14 @@ int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, struct scsi_request *rq; int ret = DRIVER_ERROR << 24; - req = blk_get_request(sdev->request_queue, + req = blk_get_request(sdev->host->admin_q, data_direction == DMA_TO_DEVICE ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, BLK_MQ_REQ_PREEMPT); if (IS_ERR(req)) return ret; rq = scsi_req(req); - if (bufflen && blk_rq_map_kern(sdev->request_queue, req, + if (bufflen && blk_rq_map_kern(req->q, req, buffer, bufflen, GFP_NOIO)) goto out; From patchwork Thu Sep 13 12:15:43 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599401 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EDC1C17DF for ; Thu, 13 Sep 2018 12:17:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DEECE2AABD for ; Thu, 13 Sep 2018 12:17:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D30472AAC0; Thu, 13 Sep 2018 12:17:10 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8449B2AAC2 for ; Thu, 13 Sep 2018 12:17:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727795AbeIMR0V (ORCPT ); Thu, 13 Sep 2018 13:26:21 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45156 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727300AbeIMR0V (ORCPT ); Thu, 13 Sep 2018 13:26:21 -0400 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.25]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 35F9C99D39; Thu, 13 Sep 2018 12:17:09 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id BE3B02010CF7; Thu, 13 Sep 2018 12:17:04 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 14/17] SCSI: transport_spi: resume a quiesced device Date: Thu, 13 Sep 2018 20:15:43 +0800 Message-Id: <20180913121546.5710-15-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.25 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Thu, 13 Sep 2018 12:17:09 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We have to preempt freeze queue in scsi_device_quiesce(), and unfreeze in scsi_device_resume(), so call scsi_device_resume() for the device which is quiesced by scsi_device_quiesce(). Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- drivers/scsi/scsi_transport_spi.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c index 40b85b752b79..e4174e8137a8 100644 --- a/drivers/scsi/scsi_transport_spi.c +++ b/drivers/scsi/scsi_transport_spi.c @@ -1052,6 +1052,9 @@ spi_dv_device(struct scsi_device *sdev) scsi_target_resume(starget); + /* undo what scsi_device_quiesce() did */ + scsi_device_resume(sdev); + spi_initial_dv(starget) = 1; out_free: From patchwork Thu Sep 13 12:15:44 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599403 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 495D8112B for ; Thu, 13 Sep 2018 12:17:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 387942AABC for ; Thu, 13 Sep 2018 12:17:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2C2CB2AACA; Thu, 13 Sep 2018 12:17:19 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 103722AABC for ; Thu, 13 Sep 2018 12:17:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727796AbeIMR03 (ORCPT ); Thu, 13 Sep 2018 13:26:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38064 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727300AbeIMR02 (ORCPT ); Thu, 13 Sep 2018 13:26:28 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id CE627308403C; Thu, 13 Sep 2018 12:17:15 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id CED7C5D6B3; Thu, 13 Sep 2018 12:17:11 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 15/17] SCSI: use admin queue to implement queue QUIESCE Date: Thu, 13 Sep 2018 20:15:44 +0800 Message-Id: <20180913121546.5710-16-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.40]); Thu, 13 Sep 2018 12:17:16 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP All admin commands are sent via per-host admin queue, so we can simply freeze the IO queue for quiescing scsi device. Also the current SCSI stack guarantees that any request originated from admin queue won't be called back to block layer via the associated IO queue, and it is always dealt with by the admin queue. So it is safe to submit admin request via admin queue when the associated IO queue is frozen, and this way matches the PREEMPT flag perfectly. Finally, we can remove the preempt_only approach for supporting SCSI quiesce, then the code in block fast path is simplified a lot. Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- block/blk-core.c | 44 ++------------------------------------------ block/blk-mq-debugfs.c | 1 - drivers/scsi/scsi_lib.c | 29 +++-------------------------- include/linux/blkdev.h | 6 ------ include/scsi/scsi_device.h | 1 - 5 files changed, 5 insertions(+), 76 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index 4dbc93f43b38..f51c19b381e3 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -421,26 +421,6 @@ void blk_sync_queue(struct request_queue *q) EXPORT_SYMBOL(blk_sync_queue); /** - * blk_set_preempt_only - set QUEUE_FLAG_PREEMPT_ONLY - * @q: request queue pointer - * - * Returns the previous value of the PREEMPT_ONLY flag - 0 if the flag was not - * set and 1 if the flag was already set. - */ -int blk_set_preempt_only(struct request_queue *q) -{ - return blk_queue_flag_test_and_set(QUEUE_FLAG_PREEMPT_ONLY, q); -} -EXPORT_SYMBOL_GPL(blk_set_preempt_only); - -void blk_clear_preempt_only(struct request_queue *q) -{ - blk_queue_flag_clear(QUEUE_FLAG_PREEMPT_ONLY, q); - wake_up_all(&q->mq_freeze_wq); -} -EXPORT_SYMBOL_GPL(blk_clear_preempt_only); - -/** * __blk_run_queue_uncond - run a queue whether or not it has been stopped * @q: The queue to run * @@ -917,27 +897,8 @@ EXPORT_SYMBOL(blk_alloc_queue); */ int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags) { - const bool preempt = flags & BLK_MQ_REQ_PREEMPT; - while (true) { - bool success = false; - - rcu_read_lock(); - if (percpu_ref_tryget_live(&q->q_usage_counter)) { - /* - * The code that sets the PREEMPT_ONLY flag is - * responsible for ensuring that that flag is globally - * visible before the queue is unfrozen. - */ - if (preempt || !blk_queue_preempt_only(q)) { - success = true; - } else { - percpu_ref_put(&q->q_usage_counter); - } - } - rcu_read_unlock(); - - if (success) + if (percpu_ref_tryget_live(&q->q_usage_counter)) return 0; if (flags & BLK_MQ_REQ_NOWAIT) @@ -953,8 +914,7 @@ int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags) smp_rmb(); wait_event(q->mq_freeze_wq, - (atomic_read(&q->mq_freeze_depth) == 0 && - (preempt || !blk_queue_preempt_only(q))) || + atomic_read(&q->mq_freeze_depth) == 0 || blk_queue_dying(q)); if (blk_queue_dying(q)) return -ENODEV; diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index 8df013e9f242..82df43ec322f 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -132,7 +132,6 @@ static const char *const blk_queue_flag_name[] = { QUEUE_FLAG_NAME(REGISTERED), QUEUE_FLAG_NAME(SCSI_PASSTHROUGH), QUEUE_FLAG_NAME(QUIESCED), - QUEUE_FLAG_NAME(PREEMPT_ONLY), QUEUE_FLAG_NAME(ADMIN), }; #undef QUEUE_FLAG_NAME diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 1e75515cc7ba..85fed8d96c8a 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -3180,34 +3180,12 @@ static void scsi_wait_for_queuecommand(struct scsi_device *sdev) int scsi_device_quiesce(struct scsi_device *sdev) { - struct request_queue *q = sdev->request_queue; int err; - /* - * It is allowed to call scsi_device_quiesce() multiple times from - * the same context but concurrent scsi_device_quiesce() calls are - * not allowed. - */ - WARN_ON_ONCE(sdev->quiesced_by && sdev->quiesced_by != current); - - blk_set_preempt_only(q); - - blk_mq_freeze_queue(q); - /* - * Ensure that the effect of blk_set_preempt_only() will be visible - * for percpu_ref_tryget() callers that occur after the queue - * unfreeze even if the queue was already frozen before this function - * was called. See also https://lwn.net/Articles/573497/. - */ - synchronize_rcu(); - blk_mq_unfreeze_queue(q); + blk_mq_freeze_queue(sdev->request_queue); mutex_lock(&sdev->state_mutex); err = scsi_device_set_state(sdev, SDEV_QUIESCE); - if (err == 0) - sdev->quiesced_by = current; - else - blk_clear_preempt_only(q); mutex_unlock(&sdev->state_mutex); return err; @@ -3230,12 +3208,11 @@ void scsi_device_resume(struct scsi_device *sdev) * device deleted during suspend) */ mutex_lock(&sdev->state_mutex); - WARN_ON_ONCE(!sdev->quiesced_by); - sdev->quiesced_by = NULL; - blk_clear_preempt_only(sdev->request_queue); if (sdev->sdev_state == SDEV_QUIESCE) scsi_device_set_state(sdev, SDEV_RUNNING); mutex_unlock(&sdev->state_mutex); + + blk_mq_unfreeze_queue(sdev->request_queue); } EXPORT_SYMBOL(scsi_device_resume); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 2dbc7524a169..1bd4f02d11c0 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -698,7 +698,6 @@ struct request_queue { #define QUEUE_FLAG_REGISTERED 26 /* queue has been registered to a disk */ #define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */ #define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */ -#define QUEUE_FLAG_PREEMPT_ONLY 29 /* only process REQ_PREEMPT requests */ #define QUEUE_FLAG_ADMIN 30 /* admin queue */ #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ @@ -740,14 +739,9 @@ bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q); ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ REQ_FAILFAST_DRIVER)) #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) -#define blk_queue_preempt_only(q) \ - test_bit(QUEUE_FLAG_PREEMPT_ONLY, &(q)->queue_flags) #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) #define blk_queue_admin(q) test_bit(QUEUE_FLAG_ADMIN, &(q)->queue_flags) -extern int blk_set_preempt_only(struct request_queue *q); -extern void blk_clear_preempt_only(struct request_queue *q); - static inline int queue_in_flight(struct request_queue *q) { return q->in_flight[0] + q->in_flight[1]; diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index f6820da1dc37..666b58799cec 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -226,7 +226,6 @@ struct scsi_device { unsigned char access_state; struct mutex state_mutex; enum scsi_device_state sdev_state; - struct task_struct *quiesced_by; atomic_t nr_admin_pending; wait_queue_head_t admin_wq; From patchwork Thu Sep 13 12:15:45 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599409 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 544B969B4 for ; Thu, 13 Sep 2018 12:17:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 455CF2AABD for ; Thu, 13 Sep 2018 12:17:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3955E2AAC2; Thu, 13 Sep 2018 12:17:25 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5DACE2AAC0 for ; Thu, 13 Sep 2018 12:17:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727730AbeIMR0f (ORCPT ); Thu, 13 Sep 2018 13:26:35 -0400 Received: from mx1.redhat.com ([209.132.183.28]:5416 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727473AbeIMR0f (ORCPT ); Thu, 13 Sep 2018 13:26:35 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C1C62310E98C; Thu, 13 Sep 2018 12:17:22 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2F2CA104C529; Thu, 13 Sep 2018 12:17:17 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 16/17] block: simplify runtime PM support Date: Thu, 13 Sep 2018 20:15:45 +0800 Message-Id: <20180913121546.5710-17-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Thu, 13 Sep 2018 12:17:22 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch simplifies runtime PM support by the following approach: 1) resume device in blk_queue_enter() if this device is runtime-suspended or runtime-suspending 2) freeze queue in blk_pre_runtime_suspend() 3) unfreeze queue in blk_pre_runtime_resume() 4) remove checking on RRF_PM because now we requires out-of-band PM request to resume device 5) introduce blk_unfreeze_queue_lock() and blk_freeze_queue_lock() so that both runtime-PM and system-PM can use them to freeze/unfreeze queue and avoid freeze & unfreeze mismatch Then we can remove blk_pm_allow_request(), and more importantly this way can be applied to blk-mq path too. Finally the IO queue associated with scsi_device is kept as runtime resumed in __scsi_execute() when sending non-PM RQF_REQUEST, and this way makes sure that the LUN is active for handling non-PM RQF_PREEMPT. Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- block/blk-core.c | 106 ++++++++++++++++++++++++++++-------------------- block/blk-mq.c | 22 ++++++++++ block/elevator.c | 25 ------------ drivers/scsi/scsi_lib.c | 14 +++++-- include/linux/blk-mq.h | 2 + include/linux/blkdev.h | 3 ++ 6 files changed, 101 insertions(+), 71 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index f51c19b381e3..07c5243c51ec 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -890,6 +890,28 @@ struct request_queue *blk_alloc_queue(gfp_t gfp_mask) } EXPORT_SYMBOL(blk_alloc_queue); +#ifdef CONFIG_PM +static void blk_resume_queue(struct request_queue *q) +{ + int rpm_status; + + if (!q->dev) + return; + + spin_lock_irq(q->queue_lock); + rpm_status = q->rpm_status; + spin_unlock_irq(q->queue_lock); + + /* PM request needs to be dealt with out of band */ + if (rpm_status == RPM_SUSPENDED || rpm_status == RPM_SUSPENDING) + pm_runtime_resume(q->dev); +} +#else +static void blk_resume_queue(struct request_queue *q) +{ +} +#endif + /** * blk_queue_enter() - try to increase q->q_usage_counter * @q: request queue pointer @@ -913,11 +935,20 @@ int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags) */ smp_rmb(); + blk_resume_queue(q); + wait_event(q->mq_freeze_wq, atomic_read(&q->mq_freeze_depth) == 0 || blk_queue_dying(q)); if (blk_queue_dying(q)) return -ENODEV; + + /* + * This allocation may be blocked via queue freezing before + * the queue is suspended, so we have to resume queue again + * after waking up. + */ + blk_resume_queue(q); } } @@ -1023,6 +1054,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id, q->bypass_depth = 1; queue_flag_set_unlocked(QUEUE_FLAG_BYPASS, q); + mutex_init(&q->freeze_lock); init_waitqueue_head(&q->mq_freeze_wq); /* @@ -1470,6 +1502,23 @@ static struct request *__get_request(struct request_list *rl, unsigned int op, return ERR_PTR(-ENOMEM); } +#ifdef CONFIG_PM +static void blk_pm_add_request(struct request_queue *q) +{ + if (q->dev) + q->nr_pending++; +} +static void blk_pm_put_request(struct request_queue *q) +{ + if (q->dev && !--q->nr_pending) + pm_runtime_mark_last_busy(q->dev); +} +#else +static inline void blk_pm_put_request(struct request_queue *q) {} +static inline void blk_pm_add_request(struct request_queue *q){} +#endif + + /** * get_request - get a free request * @q: request_queue to allocate request from @@ -1498,16 +1547,19 @@ static struct request *get_request(struct request_queue *q, unsigned int op, rl = blk_get_rl(q, bio); /* transferred to @rq on success */ retry: + blk_pm_add_request(q); rq = __get_request(rl, op, bio, flags, gfp); if (!IS_ERR(rq)) return rq; if (op & REQ_NOWAIT) { + blk_pm_put_request(q); blk_put_rl(rl); return ERR_PTR(-EAGAIN); } if ((flags & BLK_MQ_REQ_NOWAIT) || unlikely(blk_queue_dying(q))) { + blk_pm_put_request(q); blk_put_rl(rl); return rq; } @@ -1518,6 +1570,7 @@ static struct request *get_request(struct request_queue *q, unsigned int op, trace_block_sleeprq(q, bio, op); + blk_pm_put_request(q); spin_unlock_irq(q->queue_lock); io_schedule(); @@ -1686,16 +1739,6 @@ void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part) } EXPORT_SYMBOL_GPL(part_round_stats); -#ifdef CONFIG_PM -static void blk_pm_put_request(struct request *rq) -{ - if (rq->q->dev && !(rq->rq_flags & RQF_PM) && !--rq->q->nr_pending) - pm_runtime_mark_last_busy(rq->q->dev); -} -#else -static inline void blk_pm_put_request(struct request *rq) {} -#endif - void __blk_put_request(struct request_queue *q, struct request *req) { req_flags_t rq_flags = req->rq_flags; @@ -1711,7 +1754,7 @@ void __blk_put_request(struct request_queue *q, struct request *req) lockdep_assert_held(q->queue_lock); blk_req_zone_write_unlock(req); - blk_pm_put_request(req); + blk_pm_put_request(q); elv_completed_request(q, req); @@ -2712,30 +2755,6 @@ void blk_account_io_done(struct request *req, u64 now) } } -#ifdef CONFIG_PM -/* - * Don't process normal requests when queue is suspended - * or in the process of suspending/resuming - */ -static bool blk_pm_allow_request(struct request *rq) -{ - switch (rq->q->rpm_status) { - case RPM_RESUMING: - case RPM_SUSPENDING: - return rq->rq_flags & RQF_PM; - case RPM_SUSPENDED: - return false; - default: - return true; - } -} -#else -static bool blk_pm_allow_request(struct request *rq) -{ - return true; -} -#endif - void blk_account_io_start(struct request *rq, bool new_io) { struct hd_struct *part; @@ -2780,13 +2799,8 @@ static struct request *elv_next_request(struct request_queue *q) WARN_ON_ONCE(q->mq_ops); while (1) { - list_for_each_entry(rq, &q->queue_head, queuelist) { - if (blk_pm_allow_request(rq)) - return rq; - - if (rq->rq_flags & RQF_SOFTBARRIER) - break; - } + list_for_each_entry(rq, &q->queue_head, queuelist) + return rq; /* * Flush request is running and flush request isn't queueable @@ -3790,6 +3804,10 @@ int blk_pre_runtime_suspend(struct request_queue *q) q->rpm_status = RPM_SUSPENDING; } spin_unlock_irq(q->queue_lock); + + if (!ret) + blk_freeze_queue_lock(q); + return ret; } EXPORT_SYMBOL(blk_pre_runtime_suspend); @@ -3867,13 +3885,15 @@ void blk_post_runtime_resume(struct request_queue *q, int err) spin_lock_irq(q->queue_lock); if (!err) { q->rpm_status = RPM_ACTIVE; - __blk_run_queue(q); pm_runtime_mark_last_busy(q->dev); pm_request_autosuspend(q->dev); } else { q->rpm_status = RPM_SUSPENDED; } spin_unlock_irq(q->queue_lock); + + if (!err) + blk_unfreeze_queue_lock(q); } EXPORT_SYMBOL(blk_post_runtime_resume); diff --git a/block/blk-mq.c b/block/blk-mq.c index 7868daaf6de0..c119336d0561 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -204,6 +204,28 @@ void blk_mq_unfreeze_queue(struct request_queue *q) } EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue); +void blk_unfreeze_queue_lock(struct request_queue *q) +{ + mutex_lock(&q->freeze_lock); + if (q->q_frozen) { + blk_mq_unfreeze_queue(q); + q->q_frozen = false; + } + mutex_unlock(&q->freeze_lock); +} +EXPORT_SYMBOL(blk_unfreeze_queue_lock); + +void blk_freeze_queue_lock(struct request_queue *q) +{ + mutex_lock(&q->freeze_lock); + if (!q->q_frozen) { + blk_mq_freeze_queue(q); + q->q_frozen = true; + } + mutex_unlock(&q->freeze_lock); +} +EXPORT_SYMBOL(blk_freeze_queue_lock); + /* * FIXME: replace the scsi_internal_device_*block_nowait() calls in the * mpt3sas driver such that this function can be removed. diff --git a/block/elevator.c b/block/elevator.c index d6abba76c89e..2e4d347ad726 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -557,27 +557,6 @@ void elv_bio_merged(struct request_queue *q, struct request *rq, e->type->ops.sq.elevator_bio_merged_fn(q, rq, bio); } -#ifdef CONFIG_PM -static void blk_pm_requeue_request(struct request *rq) -{ - if (rq->q->dev && !(rq->rq_flags & RQF_PM)) - rq->q->nr_pending--; -} - -static void blk_pm_add_request(struct request_queue *q, struct request *rq) -{ - if (q->dev && !(rq->rq_flags & RQF_PM) && q->nr_pending++ == 0 && - (q->rpm_status == RPM_SUSPENDED || q->rpm_status == RPM_SUSPENDING)) - pm_request_resume(q->dev); -} -#else -static inline void blk_pm_requeue_request(struct request *rq) {} -static inline void blk_pm_add_request(struct request_queue *q, - struct request *rq) -{ -} -#endif - void elv_requeue_request(struct request_queue *q, struct request *rq) { /* @@ -592,8 +571,6 @@ void elv_requeue_request(struct request_queue *q, struct request *rq) rq->rq_flags &= ~RQF_STARTED; - blk_pm_requeue_request(rq); - __elv_add_request(q, rq, ELEVATOR_INSERT_REQUEUE); } @@ -620,8 +597,6 @@ void __elv_add_request(struct request_queue *q, struct request *rq, int where) { trace_block_rq_insert(q, rq); - blk_pm_add_request(q, rq); - rq->q = q; if (rq->rq_flags & RQF_SOFTBARRIER) { diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 85fed8d96c8a..84d1c450b858 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -278,12 +278,17 @@ int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, struct request *req; struct scsi_request *rq; int ret = DRIVER_ERROR << 24; + bool pm_rq = rq_flags & RQF_PM; + + if (!pm_rq) + scsi_autopm_get_device(sdev); req = blk_get_request(sdev->host->admin_q, data_direction == DMA_TO_DEVICE ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, BLK_MQ_REQ_PREEMPT); if (IS_ERR(req)) - return ret; + goto fail; + rq = scsi_req(req); if (bufflen && blk_rq_map_kern(req->q, req, @@ -327,6 +332,9 @@ int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, atomic_dec(&sdev->nr_admin_pending); wake_up_all(&sdev->admin_wq); + fail: + if (!pm_rq) + scsi_autopm_put_device(sdev); return ret; } @@ -3182,7 +3190,7 @@ scsi_device_quiesce(struct scsi_device *sdev) { int err; - blk_mq_freeze_queue(sdev->request_queue); + blk_freeze_queue_lock(sdev->request_queue); mutex_lock(&sdev->state_mutex); err = scsi_device_set_state(sdev, SDEV_QUIESCE); @@ -3212,7 +3220,7 @@ void scsi_device_resume(struct scsi_device *sdev) scsi_device_set_state(sdev, SDEV_RUNNING); mutex_unlock(&sdev->state_mutex); - blk_mq_unfreeze_queue(sdev->request_queue); + blk_unfreeze_queue_lock(sdev->request_queue); } EXPORT_SYMBOL(scsi_device_resume); diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index afde18ac5b31..00970a0b4b06 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -295,6 +295,8 @@ void blk_freeze_queue_start(struct request_queue *q); void blk_mq_freeze_queue_wait(struct request_queue *q); int blk_mq_freeze_queue_wait_timeout(struct request_queue *q, unsigned long timeout); +void blk_freeze_queue_lock(struct request_queue *q); +void blk_unfreeze_queue_lock(struct request_queue *q); int blk_mq_map_queues(struct blk_mq_tag_set *set); void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 1bd4f02d11c0..4b2abdccec1f 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -635,6 +635,9 @@ struct request_queue { int bypass_depth; atomic_t mq_freeze_depth; + bool q_frozen; + struct mutex freeze_lock; + #if defined(CONFIG_BLK_DEV_BSG) bsg_job_fn *bsg_job_fn; struct bsg_class_device bsg_dev; From patchwork Thu Sep 13 12:15:46 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 10599413 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 28D8214E5 for ; Thu, 13 Sep 2018 12:17:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 196802AABC for ; Thu, 13 Sep 2018 12:17:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0CEA82AAC0; Thu, 13 Sep 2018 12:17:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 19E7A2AABD for ; Thu, 13 Sep 2018 12:17:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727749AbeIMR0m (ORCPT ); Thu, 13 Sep 2018 13:26:42 -0400 Received: from mx1.redhat.com ([209.132.183.28]:50988 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727358AbeIMR0m (ORCPT ); Thu, 13 Sep 2018 13:26:42 -0400 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.24]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B424B36883; Thu, 13 Sep 2018 12:17:29 +0000 (UTC) Received: from localhost (ovpn-8-34.pek2.redhat.com [10.72.8.34]) by smtp.corp.redhat.com (Postfix) with ESMTP id 58E97308BE75; Thu, 13 Sep 2018 12:17:25 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , Alan Stern , Christoph Hellwig , Bart Van Assche , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , Adrian Hunter , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH V3 17/17] block: enable runtime PM for blk-mq Date: Thu, 13 Sep 2018 20:15:46 +0800 Message-Id: <20180913121546.5710-18-ming.lei@redhat.com> In-Reply-To: <20180913121546.5710-1-ming.lei@redhat.com> References: <20180913121546.5710-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.24 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Thu, 13 Sep 2018 12:17:29 +0000 (UTC) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Now blk-mq can borrow the runtime PM approach from legacy path, so enable it simply. The only difference with legacy is that: 1) blk_mq_queue_sched_tag_busy_iter() is introduced for checking if queue is idle, instead of maintaining one counter. 2) we have to iterate over scheduler tags for counting how many requests entering queue because requests in hw tags don't cover these allocated and not dispatched. Cc: Alan Stern Cc: Christoph Hellwig Cc: Bart Van Assche Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Adrian Hunter Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- block/blk-core.c | 39 ++++++++++++++++++++++++++++++++++----- block/blk-mq-tag.c | 21 +++++++++++++++++++-- block/blk-mq-tag.h | 2 ++ block/blk-mq.c | 4 ++++ 4 files changed, 59 insertions(+), 7 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index 07c5243c51ec..1aac76ae8c52 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -3755,11 +3755,8 @@ EXPORT_SYMBOL(blk_finish_plug); */ void blk_pm_runtime_init(struct request_queue *q, struct device *dev) { - /* Don't enable runtime PM for blk-mq until it is ready */ - if (q->mq_ops) { - pm_runtime_disable(dev); + if (WARN_ON_ONCE(blk_queue_admin(q))) return; - } q->dev = dev; q->rpm_status = RPM_ACTIVE; @@ -3768,6 +3765,23 @@ void blk_pm_runtime_init(struct request_queue *q, struct device *dev) } EXPORT_SYMBOL(blk_pm_runtime_init); +static void blk_mq_pm_count_req(struct blk_mq_hw_ctx *hctx, + struct request *rq, void *priv, bool reserved) +{ + unsigned long *cnt = priv; + + (*cnt)++; +} + +static bool blk_mq_pm_queue_busy(struct request_queue *q) +{ + unsigned long cnt = 0; + + blk_mq_queue_sched_tag_busy_iter(q, blk_mq_pm_count_req, &cnt); + + return cnt > 0; +} + /** * blk_pre_runtime_suspend - Pre runtime suspend check * @q: the queue of the device @@ -3792,12 +3806,20 @@ EXPORT_SYMBOL(blk_pm_runtime_init); int blk_pre_runtime_suspend(struct request_queue *q) { int ret = 0; + bool busy = true; + unsigned long last_busy; if (!q->dev) return ret; + last_busy = READ_ONCE(q->dev->power.last_busy); + + if (q->mq_ops) + busy = blk_mq_pm_queue_busy(q); + spin_lock_irq(q->queue_lock); - if (q->nr_pending) { + busy = q->mq_ops ? busy : !!q->nr_pending; + if (busy) { ret = -EBUSY; pm_runtime_mark_last_busy(q->dev); } else { @@ -3805,6 +3827,13 @@ int blk_pre_runtime_suspend(struct request_queue *q) } spin_unlock_irq(q->queue_lock); + /* + * Any new IO during this window will prevent the current suspend + * from going on + */ + if (unlikely(last_busy != READ_ONCE(q->dev->power.last_busy))) + ret = -EBUSY; + if (!ret) blk_freeze_queue_lock(q); diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index 7b0390f1c764..70e76dd035c1 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -322,8 +322,8 @@ void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset, } EXPORT_SYMBOL(blk_mq_tagset_busy_iter); -void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn, - void *priv) +static void __blk_mq_queue_tag_busy_iter(struct request_queue *q, + busy_iter_fn *fn, void *priv, bool sched_tag) { struct blk_mq_hw_ctx *hctx; int i; @@ -344,6 +344,9 @@ void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn, queue_for_each_hw_ctx(q, hctx, i) { struct blk_mq_tags *tags = hctx->tags; + if (sched_tag && hctx->sched_tags) + tags = hctx->sched_tags; + /* * If not software queues are currently mapped to this * hardware queue, there's nothing to check @@ -358,6 +361,20 @@ void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn, rcu_read_unlock(); } +void blk_mq_queue_tag_busy_iter(struct request_queue *q, + busy_iter_fn *fn, void *priv) +{ + + __blk_mq_queue_tag_busy_iter(q, fn, priv, false); +} + +void blk_mq_queue_sched_tag_busy_iter(struct request_queue *q, + busy_iter_fn *fn, void *priv) +{ + + __blk_mq_queue_tag_busy_iter(q, fn, priv, true); +} + static int bt_alloc(struct sbitmap_queue *bt, unsigned int depth, bool round_robin, int node) { diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h index 61deab0b5a5a..5513c3eeab00 100644 --- a/block/blk-mq-tag.h +++ b/block/blk-mq-tag.h @@ -35,6 +35,8 @@ extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx, extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool); void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn, void *priv); +void blk_mq_queue_sched_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn, + void *priv); static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt, struct blk_mq_hw_ctx *hctx) diff --git a/block/blk-mq.c b/block/blk-mq.c index c119336d0561..1f6bc927804e 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -25,6 +25,7 @@ #include #include #include +#include #include @@ -503,6 +504,9 @@ static void __blk_mq_free_request(struct request *rq) blk_mq_put_tag(hctx, hctx->sched_tags, ctx, sched_tag); blk_mq_sched_restart(hctx); blk_queue_exit(q); + + if (q->dev) + pm_runtime_mark_last_busy(q->dev); } void blk_mq_free_request(struct request *rq)