From patchwork Fri Jul 12 02:47:22 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 11041309 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 D3B2E1395 for ; Fri, 12 Jul 2019 02:47:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C596828AF9 for ; Fri, 12 Jul 2019 02:47:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B935E28BB9; Fri, 12 Jul 2019 02:47:57 +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 6AFC528AF9 for ; Fri, 12 Jul 2019 02:47:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728890AbfGLCrz (ORCPT ); Thu, 11 Jul 2019 22:47:55 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37044 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726505AbfGLCry (ORCPT ); Thu, 11 Jul 2019 22:47:54 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 162113001833; Fri, 12 Jul 2019 02:47:54 +0000 (UTC) Received: from localhost (ovpn-8-19.pek2.redhat.com [10.72.8.19]) by smtp.corp.redhat.com (Postfix) with ESMTP id 133105C5DE; Fri, 12 Jul 2019 02:47:52 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, "James E . J . Bottomley" , "Martin K . Petersen" , linux-scsi@vger.kernel.org, Ming Lei , Bart Van Assche , Hannes Reinecke , Christoph Hellwig , Thomas Gleixner , Keith Busch Subject: [RFC PATCH 3/7] blk-mq: stop to handle IO before hctx's all CPUs become offline Date: Fri, 12 Jul 2019 10:47:22 +0800 Message-Id: <20190712024726.1227-4-ming.lei@redhat.com> In-Reply-To: <20190712024726.1227-1-ming.lei@redhat.com> References: <20190712024726.1227-1-ming.lei@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.40]); Fri, 12 Jul 2019 02:47:54 +0000 (UTC) Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Most of blk-mq drivers depend on managed IRQ's auto-affinity to setup up queue mapping. Thomas mentioned the following point[1]: " That was the constraint of managed interrupts from the very beginning: The driver/subsystem has to quiesce the interrupt line and the associated queue _before_ it gets shutdown in CPU unplug and not fiddle with it until it's restarted by the core when the CPU is plugged in again. " However, current blk-mq implementation doesn't quiesce hw queue before the last CPU in the hctx is shutdown. Even worse, CPUHP_BLK_MQ_DEAD is one cpuhp state handled after the CPU is down, so there isn't any chance to quiesce hctx for blk-mq wrt. CPU hotplug. Add new cpuhp state of CPUHP_AP_BLK_MQ_ONLINE for blk-mq to stop queues and wait for completion of in-flight requests. [1] https://lore.kernel.org/linux-block/alpine.DEB.2.21.1904051331270.1802@nanos.tec.linutronix.de/ Cc: Bart Van Assche Cc: Hannes Reinecke Cc: Christoph Hellwig Cc: Thomas Gleixner Cc: Keith Busch Signed-off-by: Ming Lei --- block/blk-mq-tag.c | 2 +- block/blk-mq-tag.h | 2 ++ block/blk-mq.c | 67 ++++++++++++++++++++++++++++++++++++++ include/linux/blk-mq.h | 1 + include/linux/cpuhotplug.h | 1 + 5 files changed, 72 insertions(+), 1 deletion(-) diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index da19f0bc8876..bcefb213ad69 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -324,7 +324,7 @@ static void bt_tags_for_each(struct blk_mq_tags *tags, struct sbitmap_queue *bt, * true to continue iterating tags, false to stop. * @priv: Will be passed as second argument to @fn. */ -static void blk_mq_all_tag_busy_iter(struct blk_mq_tags *tags, +void blk_mq_all_tag_busy_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn, void *priv) { if (tags->nr_reserved_tags) diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h index 61deab0b5a5a..321fd6f440e6 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_all_tag_busy_iter(struct blk_mq_tags *tags, + busy_tag_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 e5ef40c603ca..028c5d78e409 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2205,6 +2205,64 @@ int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, return -ENOMEM; } +static bool blk_mq_count_inflight_rq(struct request *rq, void *data, + bool reserved) +{ + unsigned *count = data; + + if ((blk_mq_rq_state(rq) == MQ_RQ_IN_FLIGHT)) + (*count)++; + + return true; +} + +unsigned blk_mq_tags_inflight_rqs(struct blk_mq_tags *tags) +{ + unsigned count = 0; + + blk_mq_all_tag_busy_iter(tags, blk_mq_count_inflight_rq, &count); + + return count; +} + +static void blk_mq_drain_inflight_rqs(struct blk_mq_hw_ctx *hctx) +{ + while (1) { + if (!blk_mq_tags_inflight_rqs(hctx->tags)) + break; + msleep(5); + } +} + +static int blk_mq_hctx_notify_online(unsigned int cpu, struct hlist_node *node) +{ + struct blk_mq_hw_ctx *hctx = hlist_entry_safe(node, + struct blk_mq_hw_ctx, cpuhp_online); + unsigned prev_cpu = -1; + + if (hctx->flags & BLK_MQ_F_NO_MANAGED_IRQ) + return 0; + + while (true) { + unsigned other_cpu = cpumask_next_and(prev_cpu, hctx->cpumask, + cpu_online_mask); + + if (other_cpu >= nr_cpu_ids) + break; + + /* return if there is other online CPU on this hctx */ + if (other_cpu != cpu) + return 0; + + prev_cpu = other_cpu; + } + + set_bit(BLK_MQ_S_INTERNAL_STOPPED, &hctx->state); + blk_mq_drain_inflight_rqs(hctx); + + return 0; +} + /* * 'cpu' is going away. splice any existing rq_list entries from this * software queue to the hw queue dispatch list, and ensure that it @@ -2221,6 +2279,9 @@ static int blk_mq_hctx_notify_dead(unsigned int cpu, struct hlist_node *node) ctx = __blk_mq_get_ctx(hctx->queue, cpu); type = hctx->type; + if (test_bit(BLK_MQ_S_INTERNAL_STOPPED, &hctx->state)) + clear_bit(BLK_MQ_S_INTERNAL_STOPPED, &hctx->state); + spin_lock(&ctx->lock); if (!list_empty(&ctx->rq_lists[type])) { list_splice_init(&ctx->rq_lists[type], &tmp); @@ -2243,6 +2304,8 @@ static void blk_mq_remove_cpuhp(struct blk_mq_hw_ctx *hctx) { cpuhp_state_remove_instance_nocalls(CPUHP_BLK_MQ_DEAD, &hctx->cpuhp_dead); + cpuhp_state_remove_instance_nocalls(CPUHP_AP_BLK_MQ_ONLINE, + &hctx->cpuhp_online); } /* hctx->ctxs will be freed in queue's release handler */ @@ -2301,6 +2364,8 @@ static int blk_mq_init_hctx(struct request_queue *q, hctx->queue_num = hctx_idx; cpuhp_state_add_instance_nocalls(CPUHP_BLK_MQ_DEAD, &hctx->cpuhp_dead); + cpuhp_state_add_instance_nocalls(CPUHP_AP_BLK_MQ_ONLINE, + &hctx->cpuhp_online); hctx->tags = set->tags[hctx_idx]; @@ -3536,6 +3601,8 @@ static int __init blk_mq_init(void) { cpuhp_setup_state_multi(CPUHP_BLK_MQ_DEAD, "block/mq:dead", NULL, blk_mq_hctx_notify_dead); + cpuhp_setup_state_multi(CPUHP_AP_BLK_MQ_ONLINE, "block/mq:online", + NULL, blk_mq_hctx_notify_online); return 0; } subsys_initcall(blk_mq_init); diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 911cdc6479dc..dc86bdac08f4 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -59,6 +59,7 @@ struct blk_mq_hw_ctx { atomic_t nr_active; struct hlist_node cpuhp_dead; + struct hlist_node cpuhp_online; struct kobject kobj; unsigned long poll_considered; diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index 87c211adf49e..5177f7bbcb88 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -147,6 +147,7 @@ enum cpuhp_state { CPUHP_AP_SMPBOOT_THREADS, CPUHP_AP_X86_VDSO_VMA_ONLINE, CPUHP_AP_IRQ_AFFINITY_ONLINE, + CPUHP_AP_BLK_MQ_ONLINE, CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS, CPUHP_AP_X86_INTEL_EPB_ONLINE, CPUHP_AP_PERF_ONLINE,