nvd.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (C) 2012-2016 Intel Corporation
    5  * All rights reserved.
    6  * Copyright (C) 2018-2020 Alexander Motin <mav@FreeBSD.org>
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include <sys/param.h>
   34 #include <sys/bio.h>
   35 #include <sys/kernel.h>
   36 #include <sys/malloc.h>
   37 #include <sys/module.h>
   38 #include <sys/queue.h>
   39 #include <sys/sysctl.h>
   40 #include <sys/systm.h>
   41 #include <sys/taskqueue.h>
   42 #include <machine/atomic.h>
   43 
   44 #include <geom/geom.h>
   45 #include <geom/geom_disk.h>
   46 
   47 #include <dev/nvme/nvme.h>
   48 #include <dev/nvme/nvme_private.h>
   49 
   50 #include <dev/pci/pcivar.h>
   51 
   52 #define NVD_STR         "nvd"
   53 
   54 struct nvd_disk;
   55 struct nvd_controller;
   56 
   57 static disk_ioctl_t nvd_ioctl;
   58 static disk_strategy_t nvd_strategy;
   59 static dumper_t nvd_dump;
   60 static disk_getattr_t nvd_getattr;
   61 
   62 static void nvd_done(void *arg, const struct nvme_completion *cpl);
   63 static void nvd_gone(struct nvd_disk *ndisk);
   64 
   65 static void *nvd_new_disk(struct nvme_namespace *ns, void *ctrlr);
   66 
   67 static void *nvd_new_controller(struct nvme_controller *ctrlr);
   68 static void nvd_controller_fail(void *ctrlr);
   69 
   70 static int nvd_load(void);
   71 static void nvd_unload(void);
   72 
   73 MALLOC_DEFINE(M_NVD, "nvd", "nvd(4) allocations");
   74 
   75 struct nvme_consumer *consumer_handle;
   76 
   77 struct nvd_disk {
   78         struct nvd_controller   *ctrlr;
   79 
   80         struct bio_queue_head   bioq;
   81         struct task             bioqtask;
   82         struct mtx              bioqlock;
   83 
   84         struct disk             *disk;
   85         struct taskqueue        *tq;
   86         struct nvme_namespace   *ns;
   87 
   88         uint32_t                cur_depth;
   89 #define NVD_ODEPTH      (1 << 30)
   90         uint32_t                ordered_in_flight;
   91         u_int                   unit;
   92 
   93         TAILQ_ENTRY(nvd_disk)   global_tailq;
   94         TAILQ_ENTRY(nvd_disk)   ctrlr_tailq;
   95 };
   96 
   97 struct nvd_controller {
   98         struct nvme_controller          *ctrlr;
   99         TAILQ_ENTRY(nvd_controller)     tailq;
  100         TAILQ_HEAD(, nvd_disk)          disk_head;
  101 };
  102 
  103 static struct mtx                       nvd_lock;
  104 static TAILQ_HEAD(, nvd_controller)     ctrlr_head;
  105 static TAILQ_HEAD(disk_list, nvd_disk)  disk_head;
  106 
  107 static SYSCTL_NODE(_hw, OID_AUTO, nvd, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
  108     "nvd driver parameters");
  109 /*
  110  * The NVMe specification does not define a maximum or optimal delete size, so
  111  *  technically max delete size is min(full size of the namespace, 2^32 - 1
  112  *  LBAs).  A single delete for a multi-TB NVMe namespace though may take much
  113  *  longer to complete than the nvme(4) I/O timeout period.  So choose a sensible
  114  *  default here that is still suitably large to minimize the number of overall
  115  *  delete operations.
  116  */
  117 static uint64_t nvd_delete_max = (1024 * 1024 * 1024);  /* 1GB */
  118 SYSCTL_UQUAD(_hw_nvd, OID_AUTO, delete_max, CTLFLAG_RDTUN, &nvd_delete_max, 0,
  119              "nvd maximum BIO_DELETE size in bytes");
  120 
  121 static int nvd_modevent(module_t mod, int type, void *arg)
  122 {
  123         int error = 0;
  124 
  125         switch (type) {
  126         case MOD_LOAD:
  127                 error = nvd_load();
  128                 break;
  129         case MOD_UNLOAD:
  130                 nvd_unload();
  131                 break;
  132         default:
  133                 break;
  134         }
  135 
  136         return (error);
  137 }
  138 
  139 moduledata_t nvd_mod = {
  140         NVD_STR,
  141         (modeventhand_t)nvd_modevent,
  142         0
  143 };
  144 
  145 DECLARE_MODULE(nvd, nvd_mod, SI_SUB_DRIVERS, SI_ORDER_ANY);
  146 MODULE_VERSION(nvd, 1);
  147 MODULE_DEPEND(nvd, nvme, 1, 1, 1);
  148 
  149 static int
  150 nvd_load(void)
  151 {
  152         if (!nvme_use_nvd)
  153                 return 0;
  154 
  155         mtx_init(&nvd_lock, "nvd_lock", NULL, MTX_DEF);
  156         TAILQ_INIT(&ctrlr_head);
  157         TAILQ_INIT(&disk_head);
  158 
  159         consumer_handle = nvme_register_consumer(nvd_new_disk,
  160             nvd_new_controller, NULL, nvd_controller_fail);
  161 
  162         return (consumer_handle != NULL ? 0 : -1);
  163 }
  164 
  165 static void
  166 nvd_unload(void)
  167 {
  168         struct nvd_controller   *ctrlr;
  169         struct nvd_disk         *ndisk;
  170 
  171         if (!nvme_use_nvd)
  172                 return;
  173 
  174         mtx_lock(&nvd_lock);
  175         while ((ctrlr = TAILQ_FIRST(&ctrlr_head)) != NULL) {
  176                 TAILQ_REMOVE(&ctrlr_head, ctrlr, tailq);
  177                 TAILQ_FOREACH(ndisk, &ctrlr->disk_head, ctrlr_tailq)
  178                         nvd_gone(ndisk);
  179                 while (!TAILQ_EMPTY(&ctrlr->disk_head))
  180                         msleep(&ctrlr->disk_head, &nvd_lock, 0, "nvd_unload",0);
  181                 free(ctrlr, M_NVD);
  182         }
  183         mtx_unlock(&nvd_lock);
  184 
  185         nvme_unregister_consumer(consumer_handle);
  186 
  187         mtx_destroy(&nvd_lock);
  188 }
  189 
  190 static void
  191 nvd_bio_submit(struct nvd_disk *ndisk, struct bio *bp)
  192 {
  193         int err;
  194 
  195         bp->bio_driver1 = NULL;
  196         if (__predict_false(bp->bio_flags & BIO_ORDERED))
  197                 atomic_add_int(&ndisk->cur_depth, NVD_ODEPTH);
  198         else
  199                 atomic_add_int(&ndisk->cur_depth, 1);
  200         err = nvme_ns_bio_process(ndisk->ns, bp, nvd_done);
  201         if (err) {
  202                 if (__predict_false(bp->bio_flags & BIO_ORDERED)) {
  203                         atomic_add_int(&ndisk->cur_depth, -NVD_ODEPTH);
  204                         atomic_add_int(&ndisk->ordered_in_flight, -1);
  205                         wakeup(&ndisk->cur_depth);
  206                 } else {
  207                         if (atomic_fetchadd_int(&ndisk->cur_depth, -1) == 1 &&
  208                             __predict_false(ndisk->ordered_in_flight != 0))
  209                                 wakeup(&ndisk->cur_depth);
  210                 }
  211                 bp->bio_error = err;
  212                 bp->bio_flags |= BIO_ERROR;
  213                 bp->bio_resid = bp->bio_bcount;
  214                 biodone(bp);
  215         }
  216 }
  217 
  218 static void
  219 nvd_strategy(struct bio *bp)
  220 {
  221         struct nvd_disk *ndisk = (struct nvd_disk *)bp->bio_disk->d_drv1;
  222 
  223         /*
  224          * bio with BIO_ORDERED flag must be executed after all previous
  225          * bios in the queue, and before any successive bios.
  226          */
  227         if (__predict_false(bp->bio_flags & BIO_ORDERED)) {
  228                 if (atomic_fetchadd_int(&ndisk->ordered_in_flight, 1) == 0 &&
  229                     ndisk->cur_depth == 0 && bioq_first(&ndisk->bioq) == NULL) {
  230                         nvd_bio_submit(ndisk, bp);
  231                         return;
  232                 }
  233         } else if (__predict_true(ndisk->ordered_in_flight == 0)) {
  234                 nvd_bio_submit(ndisk, bp);
  235                 return;
  236         }
  237 
  238         /*
  239          * There are ordered bios in flight, so we need to submit
  240          *  bios through the task queue to enforce ordering.
  241          */
  242         mtx_lock(&ndisk->bioqlock);
  243         bioq_insert_tail(&ndisk->bioq, bp);
  244         mtx_unlock(&ndisk->bioqlock);
  245         taskqueue_enqueue(ndisk->tq, &ndisk->bioqtask);
  246 }
  247 
  248 static void
  249 nvd_gone(struct nvd_disk *ndisk)
  250 {
  251         struct bio      *bp;
  252 
  253         printf(NVD_STR"%u: detached\n", ndisk->unit);
  254         mtx_lock(&ndisk->bioqlock);
  255         disk_gone(ndisk->disk);
  256         while ((bp = bioq_takefirst(&ndisk->bioq)) != NULL) {
  257                 if (__predict_false(bp->bio_flags & BIO_ORDERED))
  258                         atomic_add_int(&ndisk->ordered_in_flight, -1);
  259                 bp->bio_error = ENXIO;
  260                 bp->bio_flags |= BIO_ERROR;
  261                 bp->bio_resid = bp->bio_bcount;
  262                 biodone(bp);
  263         }
  264         mtx_unlock(&ndisk->bioqlock);
  265 }
  266 
  267 static void
  268 nvd_gonecb(struct disk *dp)
  269 {
  270         struct nvd_disk *ndisk = (struct nvd_disk *)dp->d_drv1;
  271 
  272         disk_destroy(ndisk->disk);
  273         mtx_lock(&nvd_lock);
  274         TAILQ_REMOVE(&disk_head, ndisk, global_tailq);
  275         TAILQ_REMOVE(&ndisk->ctrlr->disk_head, ndisk, ctrlr_tailq);
  276         if (TAILQ_EMPTY(&ndisk->ctrlr->disk_head))
  277                 wakeup(&ndisk->ctrlr->disk_head);
  278         mtx_unlock(&nvd_lock);
  279         taskqueue_free(ndisk->tq);
  280         mtx_destroy(&ndisk->bioqlock);
  281         free(ndisk, M_NVD);
  282 }
  283 
  284 static int
  285 nvd_ioctl(struct disk *dp, u_long cmd, void *data, int fflag,
  286     struct thread *td)
  287 {
  288         struct nvd_disk         *ndisk = dp->d_drv1;
  289 
  290         return (nvme_ns_ioctl_process(ndisk->ns, cmd, data, fflag, td));
  291 }
  292 
  293 static int
  294 nvd_dump(void *arg, void *virt, off_t offset, size_t len)
  295 {
  296         struct disk *dp = arg;
  297         struct nvd_disk *ndisk = dp->d_drv1;
  298 
  299         return (nvme_ns_dump(ndisk->ns, virt, offset, len));
  300 }
  301 
  302 static int
  303 nvd_getattr(struct bio *bp)
  304 {
  305         struct nvd_disk *ndisk = (struct nvd_disk *)bp->bio_disk->d_drv1;
  306         const struct nvme_namespace_data *nsdata;
  307         u_int i;
  308 
  309         if (!strcmp("GEOM::lunid", bp->bio_attribute)) {
  310                 nsdata = nvme_ns_get_data(ndisk->ns);
  311 
  312                 /* Try to return NGUID as lunid. */
  313                 for (i = 0; i < sizeof(nsdata->nguid); i++) {
  314                         if (nsdata->nguid[i] != 0)
  315                                 break;
  316                 }
  317                 if (i < sizeof(nsdata->nguid)) {
  318                         if (bp->bio_length < sizeof(nsdata->nguid) * 2 + 1)
  319                                 return (EFAULT);
  320                         for (i = 0; i < sizeof(nsdata->nguid); i++) {
  321                                 sprintf(&bp->bio_data[i * 2], "%02x",
  322                                     nsdata->nguid[i]);
  323                         }
  324                         bp->bio_completed = bp->bio_length;
  325                         return (0);
  326                 }
  327 
  328                 /* Try to return EUI64 as lunid. */
  329                 for (i = 0; i < sizeof(nsdata->eui64); i++) {
  330                         if (nsdata->eui64[i] != 0)
  331                                 break;
  332                 }
  333                 if (i < sizeof(nsdata->eui64)) {
  334                         if (bp->bio_length < sizeof(nsdata->eui64) * 2 + 1)
  335                                 return (EFAULT);
  336                         for (i = 0; i < sizeof(nsdata->eui64); i++) {
  337                                 sprintf(&bp->bio_data[i * 2], "%02x",
  338                                     nsdata->eui64[i]);
  339                         }
  340                         bp->bio_completed = bp->bio_length;
  341                         return (0);
  342                 }
  343         }
  344         return (-1);
  345 }
  346 
  347 static void
  348 nvd_done(void *arg, const struct nvme_completion *cpl)
  349 {
  350         struct bio *bp = (struct bio *)arg;
  351         struct nvd_disk *ndisk = bp->bio_disk->d_drv1;
  352 
  353         if (__predict_false(bp->bio_flags & BIO_ORDERED)) {
  354                 atomic_add_int(&ndisk->cur_depth, -NVD_ODEPTH);
  355                 atomic_add_int(&ndisk->ordered_in_flight, -1);
  356                 wakeup(&ndisk->cur_depth);
  357         } else {
  358                 if (atomic_fetchadd_int(&ndisk->cur_depth, -1) == 1 &&
  359                     __predict_false(ndisk->ordered_in_flight != 0))
  360                         wakeup(&ndisk->cur_depth);
  361         }
  362 
  363         biodone(bp);
  364 }
  365 
  366 static void
  367 nvd_bioq_process(void *arg, int pending)
  368 {
  369         struct nvd_disk *ndisk = arg;
  370         struct bio *bp;
  371 
  372         for (;;) {
  373                 mtx_lock(&ndisk->bioqlock);
  374                 bp = bioq_takefirst(&ndisk->bioq);
  375                 mtx_unlock(&ndisk->bioqlock);
  376                 if (bp == NULL)
  377                         break;
  378 
  379                 if (__predict_false(bp->bio_flags & BIO_ORDERED)) {
  380                         /*
  381                          * bio with BIO_ORDERED flag set must be executed
  382                          * after all previous bios.
  383                          */
  384                         while (ndisk->cur_depth > 0)
  385                                 tsleep(&ndisk->cur_depth, 0, "nvdorb", 1);
  386                 } else {
  387                         /*
  388                          * bio with BIO_ORDERED flag set must be completed
  389                          * before proceeding with additional bios.
  390                          */
  391                         while (ndisk->cur_depth >= NVD_ODEPTH)
  392                                 tsleep(&ndisk->cur_depth, 0, "nvdora", 1);
  393                 }
  394 
  395                 nvd_bio_submit(ndisk, bp);
  396         }
  397 }
  398 
  399 static void *
  400 nvd_new_controller(struct nvme_controller *ctrlr)
  401 {
  402         struct nvd_controller   *nvd_ctrlr;
  403 
  404         nvd_ctrlr = malloc(sizeof(struct nvd_controller), M_NVD,
  405             M_ZERO | M_WAITOK);
  406 
  407         nvd_ctrlr->ctrlr = ctrlr;
  408         TAILQ_INIT(&nvd_ctrlr->disk_head);
  409         mtx_lock(&nvd_lock);
  410         TAILQ_INSERT_TAIL(&ctrlr_head, nvd_ctrlr, tailq);
  411         mtx_unlock(&nvd_lock);
  412 
  413         return (nvd_ctrlr);
  414 }
  415 
  416 static void *
  417 nvd_new_disk(struct nvme_namespace *ns, void *ctrlr_arg)
  418 {
  419         uint8_t                 descr[NVME_MODEL_NUMBER_LENGTH+1];
  420         struct nvd_disk         *ndisk, *tnd;
  421         struct disk             *disk;
  422         struct nvd_controller   *ctrlr = ctrlr_arg;
  423         device_t                 dev = ctrlr->ctrlr->dev;
  424         int unit;
  425 
  426         ndisk = malloc(sizeof(struct nvd_disk), M_NVD, M_ZERO | M_WAITOK);
  427         ndisk->ctrlr = ctrlr;
  428         ndisk->ns = ns;
  429         ndisk->cur_depth = 0;
  430         ndisk->ordered_in_flight = 0;
  431         mtx_init(&ndisk->bioqlock, "nvd bioq lock", NULL, MTX_DEF);
  432         bioq_init(&ndisk->bioq);
  433         TASK_INIT(&ndisk->bioqtask, 0, nvd_bioq_process, ndisk);
  434 
  435         mtx_lock(&nvd_lock);
  436         unit = 0;
  437         TAILQ_FOREACH(tnd, &disk_head, global_tailq) {
  438                 if (tnd->unit > unit)
  439                         break;
  440                 unit = tnd->unit + 1;
  441         }
  442         ndisk->unit = unit;
  443         if (tnd != NULL)
  444                 TAILQ_INSERT_BEFORE(tnd, ndisk, global_tailq);
  445         else
  446                 TAILQ_INSERT_TAIL(&disk_head, ndisk, global_tailq);
  447         TAILQ_INSERT_TAIL(&ctrlr->disk_head, ndisk, ctrlr_tailq);
  448         mtx_unlock(&nvd_lock);
  449 
  450         ndisk->tq = taskqueue_create("nvd_taskq", M_WAITOK,
  451             taskqueue_thread_enqueue, &ndisk->tq);
  452         taskqueue_start_threads(&ndisk->tq, 1, PI_DISK, "nvd taskq");
  453 
  454         disk = ndisk->disk = disk_alloc();
  455         disk->d_strategy = nvd_strategy;
  456         disk->d_ioctl = nvd_ioctl;
  457         disk->d_dump = nvd_dump;
  458         disk->d_getattr = nvd_getattr;
  459         disk->d_gone = nvd_gonecb;
  460         disk->d_name = NVD_STR;
  461         disk->d_unit = ndisk->unit;
  462         disk->d_drv1 = ndisk;
  463 
  464         disk->d_sectorsize = nvme_ns_get_sector_size(ns);
  465         disk->d_mediasize = (off_t)nvme_ns_get_size(ns);
  466         disk->d_maxsize = nvme_ns_get_max_io_xfer_size(ns);
  467         disk->d_delmaxsize = (off_t)nvme_ns_get_size(ns);
  468         if (disk->d_delmaxsize > nvd_delete_max)
  469                 disk->d_delmaxsize = nvd_delete_max;
  470         disk->d_stripesize = nvme_ns_get_stripesize(ns);
  471         disk->d_flags = DISKFLAG_UNMAPPED_BIO | DISKFLAG_DIRECT_COMPLETION;
  472         if (nvme_ns_get_flags(ns) & NVME_NS_DEALLOCATE_SUPPORTED)
  473                 disk->d_flags |= DISKFLAG_CANDELETE;
  474         if (nvme_ns_get_flags(ns) & NVME_NS_FLUSH_SUPPORTED)
  475                 disk->d_flags |= DISKFLAG_CANFLUSHCACHE;
  476 
  477         /*
  478          * d_ident and d_descr are both far bigger than the length of either
  479          *  the serial or model number strings.
  480          */
  481         nvme_strvis(disk->d_ident, nvme_ns_get_serial_number(ns),
  482             sizeof(disk->d_ident), NVME_SERIAL_NUMBER_LENGTH);
  483         nvme_strvis(descr, nvme_ns_get_model_number(ns), sizeof(descr),
  484             NVME_MODEL_NUMBER_LENGTH);
  485         strlcpy(disk->d_descr, descr, sizeof(descr));
  486 
  487         /*
  488          * For devices that are reported as children of the AHCI controller,
  489          * which has no access to the config space for this controller, report
  490          * the AHCI controller's data.
  491          */
  492         if (ctrlr->ctrlr->quirks & QUIRK_AHCI)
  493                 dev = device_get_parent(dev);
  494         disk->d_hba_vendor = pci_get_vendor(dev);
  495         disk->d_hba_device = pci_get_device(dev);
  496         disk->d_hba_subvendor = pci_get_subvendor(dev);
  497         disk->d_hba_subdevice = pci_get_subdevice(dev);
  498         disk->d_rotation_rate = DISK_RR_NON_ROTATING;
  499         strlcpy(disk->d_attachment, device_get_nameunit(dev),
  500             sizeof(disk->d_attachment));
  501 
  502         disk_create(disk, DISK_VERSION);
  503 
  504         printf(NVD_STR"%u: <%s> NVMe namespace\n", disk->d_unit, descr);
  505         printf(NVD_STR"%u: %juMB (%ju %u byte sectors)\n", disk->d_unit,
  506                 (uintmax_t)disk->d_mediasize / (1024*1024),
  507                 (uintmax_t)disk->d_mediasize / disk->d_sectorsize,
  508                 disk->d_sectorsize);
  509 
  510         return (ndisk);
  511 }
  512 
  513 static void
  514 nvd_controller_fail(void *ctrlr_arg)
  515 {
  516         struct nvd_controller   *ctrlr = ctrlr_arg;
  517         struct nvd_disk         *ndisk;
  518 
  519         mtx_lock(&nvd_lock);
  520         TAILQ_REMOVE(&ctrlr_head, ctrlr, tailq);
  521         TAILQ_FOREACH(ndisk, &ctrlr->disk_head, ctrlr_tailq)
  522                 nvd_gone(ndisk);
  523         while (!TAILQ_EMPTY(&ctrlr->disk_head))
  524                 msleep(&ctrlr->disk_head, &nvd_lock, 0, "nvd_fail", 0);
  525         mtx_unlock(&nvd_lock);
  526         free(ctrlr, M_NVD);
  527 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/nvd/nvd.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/nvd/nvd.c
