sys/dev/nvme/nvme.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (C) 2012-2014 Intel Corporation
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/bus.h>
  34 #include <sys/conf.h>
  35 #include <sys/module.h>
  36
  37 #include <vm/uma.h>
  38
  39 #include "nvme_private.h"
  40
  41 struct nvme_consumer {
  42         uint32_t                id;
  43         nvme_cons_ns_fn_t       ns_fn;
  44         nvme_cons_ctrlr_fn_t    ctrlr_fn;
  45         nvme_cons_async_fn_t    async_fn;
  46         nvme_cons_fail_fn_t     fail_fn;
  47 };
  48
  49 struct nvme_consumer nvme_consumer[NVME_MAX_CONSUMERS];
  50 #define INVALID_CONSUMER_ID     0xFFFF
  51
  52 uma_zone_t      nvme_request_zone;
  53 int32_t         nvme_retry_count;
  54
  55
  56 MALLOC_DEFINE(M_NVME, "nvme", "nvme(4) memory allocations");
  57
  58 devclass_t nvme_devclass;
  59
  60 static void
  61 nvme_init(void)
  62 {
  63         uint32_t        i;
  64
  65         nvme_request_zone = uma_zcreate("nvme_request",
  66             sizeof(struct nvme_request), NULL, NULL, NULL, NULL, 0, 0);
  67
  68         for (i = 0; i < NVME_MAX_CONSUMERS; i++)
  69                 nvme_consumer[i].id = INVALID_CONSUMER_ID;
  70 }
  71
  72 SYSINIT(nvme_register, SI_SUB_DRIVERS, SI_ORDER_SECOND, nvme_init, NULL);
  73
  74 static void
  75 nvme_uninit(void)
  76 {
  77         uma_zdestroy(nvme_request_zone);
  78 }
  79
  80 SYSUNINIT(nvme_unregister, SI_SUB_DRIVERS, SI_ORDER_SECOND, nvme_uninit, NULL);
  81
  82 int
  83 nvme_shutdown(device_t dev)
  84 {
  85         struct nvme_controller  *ctrlr;
  86
  87         ctrlr = DEVICE2SOFTC(dev);
  88         nvme_ctrlr_shutdown(ctrlr);
  89
  90         return (0);
  91 }
  92
  93 void
  94 nvme_dump_command(struct nvme_command *cmd)
  95 {
  96
  97         printf(
  98 "opc:%x f:%x cid:%x nsid:%x r2:%x r3:%x mptr:%jx prp1:%jx prp2:%jx cdw:%x %x %x %x %x %x\n",
  99             cmd->opc, cmd->fuse, cmd->cid, le32toh(cmd->nsid),
 100             cmd->rsvd2, cmd->rsvd3,
 101             (uintmax_t)le64toh(cmd->mptr), (uintmax_t)le64toh(cmd->prp1), (uintmax_t)le64toh(cmd->prp2),
 102             le32toh(cmd->cdw10), le32toh(cmd->cdw11), le32toh(cmd->cdw12),
 103             le32toh(cmd->cdw13), le32toh(cmd->cdw14), le32toh(cmd->cdw15));
 104 }
 105
 106 void
 107 nvme_dump_completion(struct nvme_completion *cpl)
 108 {
 109         uint8_t p, sc, sct, m, dnr;
 110         uint16_t status;
 111
 112         status = le16toh(cpl->status);
 113
 114         p = NVME_STATUS_GET_P(status);
 115         sc = NVME_STATUS_GET_SC(status);
 116         sct = NVME_STATUS_GET_SCT(status);
 117         m = NVME_STATUS_GET_M(status);
 118         dnr = NVME_STATUS_GET_DNR(status);
 119
 120         printf("cdw0:%08x sqhd:%04x sqid:%04x "
 121             "cid:%04x p:%x sc:%02x sct:%x m:%x dnr:%x\n",
 122             le32toh(cpl->cdw0), le16toh(cpl->sqhd), le16toh(cpl->sqid),
 123             cpl->cid, p, sc, sct, m, dnr);
 124 }
 125
 126 int
 127 nvme_attach(device_t dev)
 128 {
 129         struct nvme_controller  *ctrlr = DEVICE2SOFTC(dev);
 130         int                     status;
 131
 132         status = nvme_ctrlr_construct(ctrlr, dev);
 133         if (status != 0) {
 134                 nvme_ctrlr_destruct(ctrlr, dev);
 135                 return (status);
 136         }
 137
 138         ctrlr->config_hook.ich_func = nvme_ctrlr_start_config_hook;
 139         ctrlr->config_hook.ich_arg = ctrlr;
 140
 141         config_intrhook_establish(&ctrlr->config_hook);
 142
 143         return (0);
 144 }
 145
 146 int
 147 nvme_detach (device_t dev)
 148 {
 149         struct nvme_controller  *ctrlr = DEVICE2SOFTC(dev);
 150
 151         nvme_ctrlr_destruct(ctrlr, dev);
 152         return (0);
 153 }
 154
 155 static void
 156 nvme_notify(struct nvme_consumer *cons,
 157             struct nvme_controller *ctrlr)
 158 {
 159         struct nvme_namespace   *ns;
 160         void                    *ctrlr_cookie;
 161         int                     cmpset, ns_idx;
 162
 163         /*
 164          * The consumer may register itself after the nvme devices
 165          *  have registered with the kernel, but before the
 166          *  driver has completed initialization.  In that case,
 167          *  return here, and when initialization completes, the
 168          *  controller will make sure the consumer gets notified.
 169          */
 170         if (!ctrlr->is_initialized)
 171                 return;
 172
 173         cmpset = atomic_cmpset_32(&ctrlr->notification_sent, 0, 1);
 174         if (cmpset == 0)
 175                 return;
 176
 177         if (cons->ctrlr_fn != NULL)
 178                 ctrlr_cookie = (*cons->ctrlr_fn)(ctrlr);
 179         else
 180                 ctrlr_cookie = (void *)(uintptr_t)0xdeadc0dedeadc0de;
 181         ctrlr->cons_cookie[cons->id] = ctrlr_cookie;
 182
 183         /* ctrlr_fn has failed.  Nothing to notify here any more. */
 184         if (ctrlr_cookie == NULL)
 185                 return;
 186
 187         if (ctrlr->is_failed) {
 188                 ctrlr->cons_cookie[cons->id] = NULL;
 189                 if (cons->fail_fn != NULL)
 190                         (*cons->fail_fn)(ctrlr_cookie);
 191                 /*
 192                  * Do not notify consumers about the namespaces of a
 193                  *  failed controller.
 194                  */
 195                 return;
 196         }
 197         for (ns_idx = 0; ns_idx < min(ctrlr->cdata.nn, NVME_MAX_NAMESPACES); ns_idx++) {
 198                 ns = &ctrlr->ns[ns_idx];
 199                 if (ns->data.nsze == 0)
 200                         continue;
 201                 if (cons->ns_fn != NULL)
 202                         ns->cons_cookie[cons->id] =
 203                             (*cons->ns_fn)(ns, ctrlr_cookie);
 204         }
 205 }
 206
 207 void
 208 nvme_notify_new_controller(struct nvme_controller *ctrlr)
 209 {
 210         int i;
 211
 212         for (i = 0; i < NVME_MAX_CONSUMERS; i++) {
 213                 if (nvme_consumer[i].id != INVALID_CONSUMER_ID) {
 214                         nvme_notify(&nvme_consumer[i], ctrlr);
 215                 }
 216         }
 217 }
 218
 219 static void
 220 nvme_notify_new_consumer(struct nvme_consumer *cons)
 221 {
 222         device_t                *devlist;
 223         struct nvme_controller  *ctrlr;
 224         int                     dev_idx, devcount;
 225
 226         if (devclass_get_devices(nvme_devclass, &devlist, &devcount))
 227                 return;
 228
 229         for (dev_idx = 0; dev_idx < devcount; dev_idx++) {
 230                 ctrlr = DEVICE2SOFTC(devlist[dev_idx]);
 231                 nvme_notify(cons, ctrlr);
 232         }
 233
 234         free(devlist, M_TEMP);
 235 }
 236
 237 void
 238 nvme_notify_async_consumers(struct nvme_controller *ctrlr,
 239                             const struct nvme_completion *async_cpl,
 240                             uint32_t log_page_id, void *log_page_buffer,
 241                             uint32_t log_page_size)
 242 {
 243         struct nvme_consumer    *cons;
 244         void                    *ctrlr_cookie;
 245         uint32_t                i;
 246
 247         for (i = 0; i < NVME_MAX_CONSUMERS; i++) {
 248                 cons = &nvme_consumer[i];
 249                 if (cons->id != INVALID_CONSUMER_ID && cons->async_fn != NULL &&
 250                     (ctrlr_cookie = ctrlr->cons_cookie[i]) != NULL) {
 251                         (*cons->async_fn)(ctrlr_cookie, async_cpl,
 252                             log_page_id, log_page_buffer, log_page_size);
 253                 }
 254         }
 255 }
 256
 257 void
 258 nvme_notify_fail_consumers(struct nvme_controller *ctrlr)
 259 {
 260         struct nvme_consumer    *cons;
 261         void                    *ctrlr_cookie;
 262         uint32_t                i;
 263
 264         /*
 265          * This controller failed during initialization (i.e. IDENTIFY
 266          *  command failed or timed out).  Do not notify any nvme
 267          *  consumers of the failure here, since the consumer does not
 268          *  even know about the controller yet.
 269          */
 270         if (!ctrlr->is_initialized)
 271                 return;
 272
 273         for (i = 0; i < NVME_MAX_CONSUMERS; i++) {
 274                 cons = &nvme_consumer[i];
 275                 if (cons->id != INVALID_CONSUMER_ID &&
 276                     (ctrlr_cookie = ctrlr->cons_cookie[i]) != NULL) {
 277                         ctrlr->cons_cookie[i] = NULL;
 278                         if (cons->fail_fn != NULL)
 279                                 cons->fail_fn(ctrlr_cookie);
 280                 }
 281         }
 282 }
 283
 284 void
 285 nvme_notify_ns(struct nvme_controller *ctrlr, int nsid)
 286 {
 287         struct nvme_consumer    *cons;
 288         struct nvme_namespace   *ns = &ctrlr->ns[nsid - 1];
 289         void                    *ctrlr_cookie;
 290         uint32_t                i;
 291
 292         if (!ctrlr->is_initialized)
 293                 return;
 294
 295         for (i = 0; i < NVME_MAX_CONSUMERS; i++) {
 296                 cons = &nvme_consumer[i];
 297                 if (cons->id != INVALID_CONSUMER_ID && cons->ns_fn != NULL &&
 298                     (ctrlr_cookie = ctrlr->cons_cookie[i]) != NULL)
 299                         ns->cons_cookie[i] = (*cons->ns_fn)(ns, ctrlr_cookie);
 300         }
 301 }
 302
 303 struct nvme_consumer *
 304 nvme_register_consumer(nvme_cons_ns_fn_t ns_fn, nvme_cons_ctrlr_fn_t ctrlr_fn,
 305                        nvme_cons_async_fn_t async_fn,
 306                        nvme_cons_fail_fn_t fail_fn)
 307 {
 308         int i;
 309
 310         /*
 311          * TODO: add locking around consumer registration.
 312          */
 313         for (i = 0; i < NVME_MAX_CONSUMERS; i++)
 314                 if (nvme_consumer[i].id == INVALID_CONSUMER_ID) {
 315                         nvme_consumer[i].id = i;
 316                         nvme_consumer[i].ns_fn = ns_fn;
 317                         nvme_consumer[i].ctrlr_fn = ctrlr_fn;
 318                         nvme_consumer[i].async_fn = async_fn;
 319                         nvme_consumer[i].fail_fn = fail_fn;
 320
 321                         nvme_notify_new_consumer(&nvme_consumer[i]);
 322                         return (&nvme_consumer[i]);
 323                 }
 324
 325         printf("nvme(4): consumer not registered - no slots available\n");
 326         return (NULL);
 327 }
 328
 329 void
 330 nvme_unregister_consumer(struct nvme_consumer *consumer)
 331 {
 332
 333         consumer->id = INVALID_CONSUMER_ID;
 334 }
 335
 336 void
 337 nvme_completion_poll_cb(void *arg, const struct nvme_completion *cpl)
 338 {
 339         struct nvme_completion_poll_status      *status = arg;
 340
 341         /*
 342          * Copy status into the argument passed by the caller, so that
 343          *  the caller can check the status to determine if the
 344          *  the request passed or failed.
 345          */
 346         memcpy(&status->cpl, cpl, sizeof(*cpl));
 347         atomic_store_rel_int(&status->done, 1);
 348 }
 349
 350 static int
 351 nvme_modevent(module_t mod __unused, int type __unused, void *argp __unused)
 352 {
 353        return (0);
 354 }
 355
 356 static moduledata_t nvme_mod = {
 357        "nvme",
 358        nvme_modevent,
 359        0
 360 };
 361
 362 DECLARE_MODULE(nvme, nvme_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
 363 MODULE_VERSION(nvme, 1);
 364 MODULE_DEPEND(nvme, cam, 1, 1, 1);