From owner-svn-src-head@freebsd.org Thu Dec 27 18:28:20 2018 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 03DB8141EF09; Thu, 27 Dec 2018 18:28:20 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id A0219863C2; Thu, 27 Dec 2018 18:28:19 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 93821F6EE; Thu, 27 Dec 2018 18:28:19 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id wBRISJJP054434; Thu, 27 Dec 2018 18:28:19 GMT (envelope-from mav@FreeBSD.org) Received: (from mav@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wBRISJIV054433; Thu, 27 Dec 2018 18:28:19 GMT (envelope-from mav@FreeBSD.org) Message-Id: <201812271828.wBRISJIV054433@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: mav set sender to mav@FreeBSD.org using -f From: Alexander Motin Date: Thu, 27 Dec 2018 18:28:19 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r342557 - head/sys/dev/nvd X-SVN-Group: head X-SVN-Commit-Author: mav X-SVN-Commit-Paths: head/sys/dev/nvd X-SVN-Commit-Revision: 342557 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: A0219863C2 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.97 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.999,0]; NEURAL_HAM_SHORT(-0.97)[-0.970,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; NEURAL_HAM_LONG(-1.00)[-0.999,0] X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 Dec 2018 18:28:20 -0000 Author: mav Date: Thu Dec 27 18:28:19 2018 New Revision: 342557 URL: https://svnweb.freebsd.org/changeset/base/342557 Log: Reimplement nvd(4) detach handling. Previous code typically crashed in case of NVMe device unplug or even clean detach while some I/Os are still in flight. To fix this the new code calls disk_gone() and waits for confirmation of all references gone before calling disk_destroy(), freeing other resources and allowing controller detach. While there, fix disk lists locking and reimplement unit numbers assignment. MFC after: 1 month Sponsored by: iXsystems, Inc. Modified: head/sys/dev/nvd/nvd.c Modified: head/sys/dev/nvd/nvd.c ============================================================================== --- head/sys/dev/nvd/nvd.c Thu Dec 27 17:23:01 2018 (r342556) +++ head/sys/dev/nvd/nvd.c Thu Dec 27 18:28:19 2018 (r342557) @@ -2,6 +2,7 @@ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (C) 2012-2016 Intel Corporation + * Copyright (C) 2018 Alexander Motin * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -34,9 +35,11 @@ __FBSDID("$FreeBSD$"); #include #include #include +#include #include #include #include +#include #include #include @@ -46,15 +49,16 @@ __FBSDID("$FreeBSD$"); #define NVD_STR "nvd" struct nvd_disk; +struct nvd_controller; static disk_ioctl_t nvd_ioctl; static disk_strategy_t nvd_strategy; static dumper_t nvd_dump; static void nvd_done(void *arg, const struct nvme_completion *cpl); +static void nvd_gone(struct nvd_disk *ndisk); static void *nvd_new_disk(struct nvme_namespace *ns, void *ctrlr); -static void destroy_geom_disk(struct nvd_disk *ndisk); static void *nvd_new_controller(struct nvme_controller *ctrlr); static void nvd_controller_fail(void *ctrlr); @@ -67,6 +71,7 @@ MALLOC_DEFINE(M_NVD, "nvd", "nvd(4) allocations"); struct nvme_consumer *consumer_handle; struct nvd_disk { + struct nvd_controller *ctrlr; struct bio_queue_head bioq; struct task bioqtask; @@ -78,6 +83,7 @@ struct nvd_disk { uint32_t cur_depth; uint32_t ordered_in_flight; + u_int unit; TAILQ_ENTRY(nvd_disk) global_tailq; TAILQ_ENTRY(nvd_disk) ctrlr_tailq; @@ -89,6 +95,7 @@ struct nvd_controller { TAILQ_HEAD(, nvd_disk) disk_head; }; +static struct mtx nvd_lock; static TAILQ_HEAD(, nvd_controller) ctrlr_head; static TAILQ_HEAD(disk_list, nvd_disk) disk_head; @@ -139,6 +146,7 @@ nvd_load() if (!nvme_use_nvd) return 0; + mtx_init(&nvd_lock, "nvd_lock", NULL, MTX_DEF); TAILQ_INIT(&ctrlr_head); TAILQ_INIT(&disk_head); @@ -152,25 +160,25 @@ static void nvd_unload() { struct nvd_controller *ctrlr; - struct nvd_disk *disk; + struct nvd_disk *ndisk; if (!nvme_use_nvd) return; - while (!TAILQ_EMPTY(&ctrlr_head)) { - ctrlr = TAILQ_FIRST(&ctrlr_head); + mtx_lock(&nvd_lock); + while ((ctrlr = TAILQ_FIRST(&ctrlr_head)) != NULL) { TAILQ_REMOVE(&ctrlr_head, ctrlr, tailq); + TAILQ_FOREACH(ndisk, &ctrlr->disk_head, ctrlr_tailq) + nvd_gone(ndisk); + while (!TAILQ_EMPTY(&ctrlr->disk_head)) + msleep(&ctrlr->disk_head, &nvd_lock, 0, "nvd_unload",0); free(ctrlr, M_NVD); } + mtx_unlock(&nvd_lock); - while (!TAILQ_EMPTY(&disk_head)) { - disk = TAILQ_FIRST(&disk_head); - TAILQ_REMOVE(&disk_head, disk, global_tailq); - destroy_geom_disk(disk); - free(disk, M_NVD); - } - nvme_unregister_consumer(consumer_handle); + + mtx_destroy(&nvd_lock); } static int @@ -220,6 +228,42 @@ nvd_strategy(struct bio *bp) taskqueue_enqueue(ndisk->tq, &ndisk->bioqtask); } +static void +nvd_gone(struct nvd_disk *ndisk) +{ + struct bio *bp; + + printf(NVD_STR"%u: detached\n", ndisk->unit); + mtx_lock(&ndisk->bioqlock); + disk_gone(ndisk->disk); + while ((bp = bioq_takefirst(&ndisk->bioq)) != NULL) { + if (__predict_false(bp->bio_flags & BIO_ORDERED)) + atomic_add_int(&ndisk->ordered_in_flight, -1); + bp->bio_error = ENXIO; + bp->bio_flags |= BIO_ERROR; + bp->bio_resid = bp->bio_bcount; + biodone(bp); + } + mtx_unlock(&ndisk->bioqlock); +} + +static void +nvd_gonecb(struct disk *dp) +{ + struct nvd_disk *ndisk = (struct nvd_disk *)dp->d_drv1; + + disk_destroy(ndisk->disk); + mtx_lock(&nvd_lock); + TAILQ_REMOVE(&disk_head, ndisk, global_tailq); + TAILQ_REMOVE(&ndisk->ctrlr->disk_head, ndisk, ctrlr_tailq); + if (TAILQ_EMPTY(&ndisk->ctrlr->disk_head)) + wakeup(&ndisk->ctrlr->disk_head); + mtx_unlock(&nvd_lock); + taskqueue_free(ndisk->tq); + mtx_destroy(&ndisk->bioqlock); + free(ndisk, M_NVD); +} + static int nvd_ioctl(struct disk *ndisk, u_long cmd, void *data, int fflag, struct thread *td) @@ -304,7 +348,9 @@ nvd_new_controller(struct nvme_controller *ctrlr) M_ZERO | M_WAITOK); TAILQ_INIT(&nvd_ctrlr->disk_head); + mtx_lock(&nvd_lock); TAILQ_INSERT_TAIL(&ctrlr_head, nvd_ctrlr, tailq); + mtx_unlock(&nvd_lock); return (nvd_ctrlr); } @@ -313,46 +359,61 @@ static void * nvd_new_disk(struct nvme_namespace *ns, void *ctrlr_arg) { uint8_t descr[NVME_MODEL_NUMBER_LENGTH+1]; - struct nvd_disk *ndisk; + struct nvd_disk *ndisk, *tnd; struct disk *disk; struct nvd_controller *ctrlr = ctrlr_arg; + int unit; ndisk = malloc(sizeof(struct nvd_disk), M_NVD, M_ZERO | M_WAITOK); + ndisk->ctrlr = ctrlr; + ndisk->ns = ns; + ndisk->cur_depth = 0; + ndisk->ordered_in_flight = 0; + mtx_init(&ndisk->bioqlock, "nvd bioq lock", NULL, MTX_DEF); + bioq_init(&ndisk->bioq); + TASK_INIT(&ndisk->bioqtask, 0, nvd_bioq_process, ndisk); - disk = disk_alloc(); + mtx_lock(&nvd_lock); + unit = 0; + TAILQ_FOREACH(tnd, &disk_head, global_tailq) { + if (tnd->unit > unit) + break; + unit = tnd->unit + 1; + } + ndisk->unit = unit; + if (tnd != NULL) + TAILQ_INSERT_BEFORE(tnd, ndisk, global_tailq); + else + TAILQ_INSERT_TAIL(&disk_head, ndisk, global_tailq); + TAILQ_INSERT_TAIL(&ctrlr->disk_head, ndisk, ctrlr_tailq); + mtx_unlock(&nvd_lock); + + ndisk->tq = taskqueue_create("nvd_taskq", M_WAITOK, + taskqueue_thread_enqueue, &ndisk->tq); + taskqueue_start_threads(&ndisk->tq, 1, PI_DISK, "nvd taskq"); + + disk = ndisk->disk = disk_alloc(); disk->d_strategy = nvd_strategy; disk->d_ioctl = nvd_ioctl; disk->d_dump = nvd_dump; + disk->d_gone = nvd_gonecb; disk->d_name = NVD_STR; + disk->d_unit = ndisk->unit; disk->d_drv1 = ndisk; - disk->d_maxsize = nvme_ns_get_max_io_xfer_size(ns); disk->d_sectorsize = nvme_ns_get_sector_size(ns); disk->d_mediasize = (off_t)nvme_ns_get_size(ns); + disk->d_maxsize = nvme_ns_get_max_io_xfer_size(ns); disk->d_delmaxsize = (off_t)nvme_ns_get_size(ns); if (disk->d_delmaxsize > nvd_delete_max) disk->d_delmaxsize = nvd_delete_max; disk->d_stripesize = nvme_ns_get_stripesize(ns); - - if (TAILQ_EMPTY(&disk_head)) - disk->d_unit = 0; - else - disk->d_unit = - TAILQ_LAST(&disk_head, disk_list)->disk->d_unit + 1; - - disk->d_flags = DISKFLAG_DIRECT_COMPLETION; - + disk->d_flags = DISKFLAG_UNMAPPED_BIO | DISKFLAG_DIRECT_COMPLETION; if (nvme_ns_get_flags(ns) & NVME_NS_DEALLOCATE_SUPPORTED) disk->d_flags |= DISKFLAG_CANDELETE; - if (nvme_ns_get_flags(ns) & NVME_NS_FLUSH_SUPPORTED) disk->d_flags |= DISKFLAG_CANFLUSHCACHE; -/* ifdef used here to ease porting to stable branches at a later point. */ -#ifdef DISKFLAG_UNMAPPED_BIO - disk->d_flags |= DISKFLAG_UNMAPPED_BIO; -#endif - /* * d_ident and d_descr are both far bigger than the length of either * the serial or model number strings. @@ -365,22 +426,6 @@ nvd_new_disk(struct nvme_namespace *ns, void *ctrlr_ar disk->d_rotation_rate = DISK_RR_NON_ROTATING; - ndisk->ns = ns; - ndisk->disk = disk; - ndisk->cur_depth = 0; - ndisk->ordered_in_flight = 0; - - mtx_init(&ndisk->bioqlock, "NVD bioq lock", NULL, MTX_DEF); - bioq_init(&ndisk->bioq); - - TASK_INIT(&ndisk->bioqtask, 0, nvd_bioq_process, ndisk); - ndisk->tq = taskqueue_create("nvd_taskq", M_WAITOK, - taskqueue_thread_enqueue, &ndisk->tq); - taskqueue_start_threads(&ndisk->tq, 1, PI_DISK, "nvd taskq"); - - TAILQ_INSERT_TAIL(&disk_head, ndisk, global_tailq); - TAILQ_INSERT_TAIL(&ctrlr->disk_head, ndisk, ctrlr_tailq); - disk_create(disk, DISK_VERSION); printf(NVD_STR"%u: <%s> NVMe namespace\n", disk->d_unit, descr); @@ -389,58 +434,22 @@ nvd_new_disk(struct nvme_namespace *ns, void *ctrlr_ar (uintmax_t)disk->d_mediasize / disk->d_sectorsize, disk->d_sectorsize); - return (NULL); + return (ndisk); } static void -destroy_geom_disk(struct nvd_disk *ndisk) -{ - struct bio *bp; - struct disk *disk; - uint32_t unit; - int cnt = 0; - - disk = ndisk->disk; - unit = disk->d_unit; - taskqueue_free(ndisk->tq); - - disk_destroy(ndisk->disk); - - mtx_lock(&ndisk->bioqlock); - for (;;) { - bp = bioq_takefirst(&ndisk->bioq); - if (bp == NULL) - break; - bp->bio_error = EIO; - bp->bio_flags |= BIO_ERROR; - bp->bio_resid = bp->bio_bcount; - cnt++; - biodone(bp); - } - - printf(NVD_STR"%u: lost device - %d outstanding\n", unit, cnt); - printf(NVD_STR"%u: removing device entry\n", unit); - - mtx_unlock(&ndisk->bioqlock); - - mtx_destroy(&ndisk->bioqlock); -} - -static void nvd_controller_fail(void *ctrlr_arg) { struct nvd_controller *ctrlr = ctrlr_arg; - struct nvd_disk *disk; + struct nvd_disk *ndisk; - while (!TAILQ_EMPTY(&ctrlr->disk_head)) { - disk = TAILQ_FIRST(&ctrlr->disk_head); - TAILQ_REMOVE(&disk_head, disk, global_tailq); - TAILQ_REMOVE(&ctrlr->disk_head, disk, ctrlr_tailq); - destroy_geom_disk(disk); - free(disk, M_NVD); - } - + mtx_lock(&nvd_lock); TAILQ_REMOVE(&ctrlr_head, ctrlr, tailq); + TAILQ_FOREACH(ndisk, &ctrlr->disk_head, ctrlr_tailq) + nvd_gone(ndisk); + while (!TAILQ_EMPTY(&ctrlr->disk_head)) + msleep(&ctrlr->disk_head, &nvd_lock, 0, "nvd_fail", 0); + mtx_unlock(&nvd_lock); free(ctrlr, M_NVD); }