drivers/nvme/host/core.c

   1 /*
   2  * NVM Express device driver
   3  * Copyright (c) 2011-2014, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  */
  14
  15 #include <linux/blkdev.h>
  16 #include <linux/blk-mq.h>
  17 #include <linux/delay.h>
  18 #include <linux/errno.h>
  19 #include <linux/hdreg.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/list_sort.h>
  23 #include <linux/slab.h>
  24 #include <linux/types.h>
  25 #include <linux/pr.h>
  26 #include <linux/ptrace.h>
  27 #include <linux/nvme_ioctl.h>
  28 #include <linux/t10-pi.h>
  29 #include <scsi/sg.h>
  30 #include <asm/unaligned.h>
  31
  32 #include "nvme.h"
  33 #include "fabrics.h"
  34
  35 #define NVME_MINORS             (1U << MINORBITS)
  36
  37 unsigned char admin_timeout = 60;
  38 module_param(admin_timeout, byte, 0644);
  39 MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands");
  40 EXPORT_SYMBOL_GPL(admin_timeout);
  41
  42 unsigned char nvme_io_timeout = 30;
  43 module_param_named(io_timeout, nvme_io_timeout, byte, 0644);
  44 MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
  45 EXPORT_SYMBOL_GPL(nvme_io_timeout);
  46
  47 unsigned char shutdown_timeout = 5;
  48 module_param(shutdown_timeout, byte, 0644);
  49 MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
  50
  51 unsigned int nvme_max_retries = 5;
  52 module_param_named(max_retries, nvme_max_retries, uint, 0644);
  53 MODULE_PARM_DESC(max_retries, "max number of retries a command may have");
  54 EXPORT_SYMBOL_GPL(nvme_max_retries);
  55
  56 static int nvme_char_major;
  57 module_param(nvme_char_major, int, 0);
  58
  59 static LIST_HEAD(nvme_ctrl_list);
  60 static DEFINE_SPINLOCK(dev_list_lock);
  61
  62 static struct class *nvme_class;
  63
  64 void nvme_cancel_request(struct request *req, void *data, bool reserved)
  65 {
  66         int status;
  67
  68         if (!blk_mq_request_started(req))
  69                 return;
  70
  71         dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
  72                                 "Cancelling I/O %d", req->tag);
  73
  74         status = NVME_SC_ABORT_REQ;
  75         if (blk_queue_dying(req->q))
  76                 status |= NVME_SC_DNR;
  77         blk_mq_complete_request(req, status);
  78 }
  79 EXPORT_SYMBOL_GPL(nvme_cancel_request);
  80
  81 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
  82                 enum nvme_ctrl_state new_state)
  83 {
  84         enum nvme_ctrl_state old_state;
  85         bool changed = false;
  86
  87         spin_lock_irq(&ctrl->lock);
  88
  89         old_state = ctrl->state;
  90         switch (new_state) {
  91         case NVME_CTRL_LIVE:
  92                 switch (old_state) {
  93                 case NVME_CTRL_NEW:
  94                 case NVME_CTRL_RESETTING:
  95                 case NVME_CTRL_RECONNECTING:
  96                         changed = true;
  97                         /* FALLTHRU */
  98                 default:
  99                         break;
 100                 }
 101                 break;
 102         case NVME_CTRL_RESETTING:
 103                 switch (old_state) {
 104                 case NVME_CTRL_NEW:
 105                 case NVME_CTRL_LIVE:
 106                 case NVME_CTRL_RECONNECTING:
 107                         changed = true;
 108                         /* FALLTHRU */
 109                 default:
 110                         break;
 111                 }
 112                 break;
 113         case NVME_CTRL_RECONNECTING:
 114                 switch (old_state) {
 115                 case NVME_CTRL_LIVE:
 116                         changed = true;
 117                         /* FALLTHRU */
 118                 default:
 119                         break;
 120                 }
 121                 break;
 122         case NVME_CTRL_DELETING:
 123                 switch (old_state) {
 124                 case NVME_CTRL_LIVE:
 125                 case NVME_CTRL_RESETTING:
 126                 case NVME_CTRL_RECONNECTING:
 127                         changed = true;
 128                         /* FALLTHRU */
 129                 default:
 130                         break;
 131                 }
 132                 break;
 133         case NVME_CTRL_DEAD:
 134                 switch (old_state) {
 135                 case NVME_CTRL_DELETING:
 136                         changed = true;
 137                         /* FALLTHRU */
 138                 default:
 139                         break;
 140                 }
 141                 break;
 142         default:
 143                 break;
 144         }
 145
 146         if (changed)
 147                 ctrl->state = new_state;
 148
 149         spin_unlock_irq(&ctrl->lock);
 150
 151         return changed;
 152 }
 153 EXPORT_SYMBOL_GPL(nvme_change_ctrl_state);
 154
 155 static void nvme_free_ns(struct kref *kref)
 156 {
 157         struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
 158
 159         if (ns->type == NVME_NS_LIGHTNVM)
 160                 nvme_nvm_unregister(ns->queue, ns->disk->disk_name);
 161
 162         spin_lock(&dev_list_lock);
 163         ns->disk->private_data = NULL;
 164         spin_unlock(&dev_list_lock);
 165
 166         put_disk(ns->disk);
 167         ida_simple_remove(&ns->ctrl->ns_ida, ns->instance);
 168         nvme_put_ctrl(ns->ctrl);
 169         kfree(ns);
 170 }
 171
 172 static void nvme_put_ns(struct nvme_ns *ns)
 173 {
 174         kref_put(&ns->kref, nvme_free_ns);
 175 }
 176
 177 static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk)
 178 {
 179         struct nvme_ns *ns;
 180
 181         spin_lock(&dev_list_lock);
 182         ns = disk->private_data;
 183         if (ns) {
 184                 if (!kref_get_unless_zero(&ns->kref))
 185                         goto fail;
 186                 if (!try_module_get(ns->ctrl->ops->module))
 187                         goto fail_put_ns;
 188         }
 189         spin_unlock(&dev_list_lock);
 190
 191         return ns;
 192
 193 fail_put_ns:
 194         kref_put(&ns->kref, nvme_free_ns);
 195 fail:
 196         spin_unlock(&dev_list_lock);
 197         return NULL;
 198 }
 199
 200 void nvme_requeue_req(struct request *req)
 201 {
 202         unsigned long flags;
 203
 204         blk_mq_requeue_request(req);
 205         spin_lock_irqsave(req->q->queue_lock, flags);
 206         if (!blk_queue_stopped(req->q))
 207                 blk_mq_kick_requeue_list(req->q);
 208         spin_unlock_irqrestore(req->q->queue_lock, flags);
 209 }
 210 EXPORT_SYMBOL_GPL(nvme_requeue_req);
 211
 212 struct request *nvme_alloc_request(struct request_queue *q,
 213                 struct nvme_command *cmd, unsigned int flags, int qid)
 214 {
 215         struct request *req;
 216
 217         if (qid == NVME_QID_ANY) {
 218                 req = blk_mq_alloc_request(q, nvme_is_write(cmd), flags);
 219         } else {
 220                 req = blk_mq_alloc_request_hctx(q, nvme_is_write(cmd), flags,
 221                                 qid ? qid - 1 : 0);
 222         }
 223         if (IS_ERR(req))
 224                 return req;
 225
 226         req->cmd_type = REQ_TYPE_DRV_PRIV;
 227         req->cmd_flags |= REQ_FAILFAST_DRIVER;
 228         req->cmd = (unsigned char *)cmd;
 229         req->cmd_len = sizeof(struct nvme_command);
 230
 231         return req;
 232 }
 233 EXPORT_SYMBOL_GPL(nvme_alloc_request);
 234
 235 static inline void nvme_setup_flush(struct nvme_ns *ns,
 236                 struct nvme_command *cmnd)
 237 {
 238         memset(cmnd, 0, sizeof(*cmnd));
 239         cmnd->common.opcode = nvme_cmd_flush;
 240         cmnd->common.nsid = cpu_to_le32(ns->ns_id);
 241 }
 242
 243 static inline int nvme_setup_discard(struct nvme_ns *ns, struct request *req,
 244                 struct nvme_command *cmnd)
 245 {
 246         struct nvme_dsm_range *range;
 247         struct page *page;
 248         int offset;
 249         unsigned int nr_bytes = blk_rq_bytes(req);
 250
 251         range = kmalloc(sizeof(*range), GFP_ATOMIC);
 252         if (!range)
 253                 return BLK_MQ_RQ_QUEUE_BUSY;
 254
 255         range->cattr = cpu_to_le32(0);
 256         range->nlb = cpu_to_le32(nr_bytes >> ns->lba_shift);
 257         range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
 258
 259         memset(cmnd, 0, sizeof(*cmnd));
 260         cmnd->dsm.opcode = nvme_cmd_dsm;
 261         cmnd->dsm.nsid = cpu_to_le32(ns->ns_id);
 262         cmnd->dsm.nr = 0;
 263         cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
 264
 265         req->completion_data = range;
 266         page = virt_to_page(range);
 267         offset = offset_in_page(range);
 268         blk_add_request_payload(req, page, offset, sizeof(*range));
 269
 270         /*
 271          * we set __data_len back to the size of the area to be discarded
 272          * on disk. This allows us to report completion on the full amount
 273          * of blocks described by the request.
 274          */
 275         req->__data_len = nr_bytes;
 276
 277         return 0;
 278 }
 279
 280 static inline void nvme_setup_rw(struct nvme_ns *ns, struct request *req,
 281                 struct nvme_command *cmnd)
 282 {
 283         u16 control = 0;
 284         u32 dsmgmt = 0;
 285
 286         if (req->cmd_flags & REQ_FUA)
 287                 control |= NVME_RW_FUA;
 288         if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
 289                 control |= NVME_RW_LR;
 290
 291         if (req->cmd_flags & REQ_RAHEAD)
 292                 dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
 293
 294         memset(cmnd, 0, sizeof(*cmnd));
 295         cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
 296         cmnd->rw.command_id = req->tag;
 297         cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
 298         cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
 299         cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
 300
 301         if (ns->ms) {
 302                 switch (ns->pi_type) {
 303                 case NVME_NS_DPS_PI_TYPE3:
 304                         control |= NVME_RW_PRINFO_PRCHK_GUARD;
 305                         break;
 306                 case NVME_NS_DPS_PI_TYPE1:
 307                 case NVME_NS_DPS_PI_TYPE2:
 308                         control |= NVME_RW_PRINFO_PRCHK_GUARD |
 309                                         NVME_RW_PRINFO_PRCHK_REF;
 310                         cmnd->rw.reftag = cpu_to_le32(
 311                                         nvme_block_nr(ns, blk_rq_pos(req)));
 312                         break;
 313                 }
 314                 if (!blk_integrity_rq(req))
 315                         control |= NVME_RW_PRINFO_PRACT;
 316         }
 317
 318         cmnd->rw.control = cpu_to_le16(control);
 319         cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
 320 }
 321
 322 int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 323                 struct nvme_command *cmd)
 324 {
 325         int ret = 0;
 326
 327         if (req->cmd_type == REQ_TYPE_DRV_PRIV)
 328                 memcpy(cmd, req->cmd, sizeof(*cmd));
 329         else if (req_op(req) == REQ_OP_FLUSH)
 330                 nvme_setup_flush(ns, cmd);
 331         else if (req_op(req) == REQ_OP_DISCARD)
 332                 ret = nvme_setup_discard(ns, req, cmd);
 333         else
 334                 nvme_setup_rw(ns, req, cmd);
 335
 336         return ret;
 337 }
 338 EXPORT_SYMBOL_GPL(nvme_setup_cmd);
 339
 340 /*
 341  * Returns 0 on success.  If the result is negative, it's a Linux error code;
 342  * if the result is positive, it's an NVM Express status code
 343  */
 344 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 345                 struct nvme_completion *cqe, void *buffer, unsigned bufflen,
 346                 unsigned timeout, int qid, int at_head, int flags)
 347 {
 348         struct request *req;
 349         int ret;
 350
 351         req = nvme_alloc_request(q, cmd, flags, qid);
 352         if (IS_ERR(req))
 353                 return PTR_ERR(req);
 354
 355         req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
 356         req->special = cqe;
 357
 358         if (buffer && bufflen) {
 359                 ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
 360                 if (ret)
 361                         goto out;
 362         }
 363
 364         blk_execute_rq(req->q, NULL, req, at_head);
 365         ret = req->errors;
 366  out:
 367         blk_mq_free_request(req);
 368         return ret;
 369 }
 370 EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd);
 371
 372 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 373                 void *buffer, unsigned bufflen)
 374 {
 375         return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0,
 376                         NVME_QID_ANY, 0, 0);
 377 }
 378 EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
 379
 380 int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 381                 void __user *ubuffer, unsigned bufflen,
 382                 void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
 383                 u32 *result, unsigned timeout)
 384 {
 385         bool write = nvme_is_write(cmd);
 386         struct nvme_completion cqe;
 387         struct nvme_ns *ns = q->queuedata;
 388         struct gendisk *disk = ns ? ns->disk : NULL;
 389         struct request *req;
 390         struct bio *bio = NULL;
 391         void *meta = NULL;
 392         int ret;
 393
 394         req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY);
 395         if (IS_ERR(req))
 396                 return PTR_ERR(req);
 397
 398         req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
 399         req->special = &cqe;
 400
 401         if (ubuffer && bufflen) {
 402                 ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
 403                                 GFP_KERNEL);
 404                 if (ret)
 405                         goto out;
 406                 bio = req->bio;
 407
 408                 if (!disk)
 409                         goto submit;
 410                 bio->bi_bdev = bdget_disk(disk, 0);
 411                 if (!bio->bi_bdev) {
 412                         ret = -ENODEV;
 413                         goto out_unmap;
 414                 }
 415
 416                 if (meta_buffer && meta_len) {
 417                         struct bio_integrity_payload *bip;
 418
 419                         meta = kmalloc(meta_len, GFP_KERNEL);
 420                         if (!meta) {
 421                                 ret = -ENOMEM;
 422                                 goto out_unmap;
 423                         }
 424
 425                         if (write) {
 426                                 if (copy_from_user(meta, meta_buffer,
 427                                                 meta_len)) {
 428                                         ret = -EFAULT;
 429                                         goto out_free_meta;
 430                                 }
 431                         }
 432
 433                         bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
 434                         if (IS_ERR(bip)) {
 435                                 ret = PTR_ERR(bip);
 436                                 goto out_free_meta;
 437                         }
 438
 439                         bip->bip_iter.bi_size = meta_len;
 440                         bip->bip_iter.bi_sector = meta_seed;
 441
 442                         ret = bio_integrity_add_page(bio, virt_to_page(meta),
 443                                         meta_len, offset_in_page(meta));
 444                         if (ret != meta_len) {
 445                                 ret = -ENOMEM;
 446                                 goto out_free_meta;
 447                         }
 448                 }
 449         }
 450  submit:
 451         blk_execute_rq(req->q, disk, req, 0);
 452         ret = req->errors;
 453         if (result)
 454                 *result = le32_to_cpu(cqe.result);
 455         if (meta && !ret && !write) {
 456                 if (copy_to_user(meta_buffer, meta, meta_len))
 457                         ret = -EFAULT;
 458         }
 459  out_free_meta:
 460         kfree(meta);
 461  out_unmap:
 462         if (bio) {
 463                 if (disk && bio->bi_bdev)
 464                         bdput(bio->bi_bdev);
 465                 blk_rq_unmap_user(bio);
 466         }
 467  out:
 468         blk_mq_free_request(req);
 469         return ret;
 470 }
 471
 472 int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 473                 void __user *ubuffer, unsigned bufflen, u32 *result,
 474                 unsigned timeout)
 475 {
 476         return __nvme_submit_user_cmd(q, cmd, ubuffer, bufflen, NULL, 0, 0,
 477                         result, timeout);
 478 }
 479
 480 static void nvme_keep_alive_end_io(struct request *rq, int error)
 481 {
 482         struct nvme_ctrl *ctrl = rq->end_io_data;
 483
 484         blk_mq_free_request(rq);
 485
 486         if (error) {
 487                 dev_err(ctrl->device,
 488                         "failed nvme_keep_alive_end_io error=%d\n", error);
 489                 return;
 490         }
 491
 492         schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
 493 }
 494
 495 static int nvme_keep_alive(struct nvme_ctrl *ctrl)
 496 {
 497         struct nvme_command c;
 498         struct request *rq;
 499
 500         memset(&c, 0, sizeof(c));
 501         c.common.opcode = nvme_admin_keep_alive;
 502
 503         rq = nvme_alloc_request(ctrl->admin_q, &c, BLK_MQ_REQ_RESERVED,
 504                         NVME_QID_ANY);
 505         if (IS_ERR(rq))
 506                 return PTR_ERR(rq);
 507
 508         rq->timeout = ctrl->kato * HZ;
 509         rq->end_io_data = ctrl;
 510
 511         blk_execute_rq_nowait(rq->q, NULL, rq, 0, nvme_keep_alive_end_io);
 512
 513         return 0;
 514 }
 515
 516 static void nvme_keep_alive_work(struct work_struct *work)
 517 {
 518         struct nvme_ctrl *ctrl = container_of(to_delayed_work(work),
 519                         struct nvme_ctrl, ka_work);
 520
 521         if (nvme_keep_alive(ctrl)) {
 522                 /* allocation failure, reset the controller */
 523                 dev_err(ctrl->device, "keep-alive failed\n");
 524                 ctrl->ops->reset_ctrl(ctrl);
 525                 return;
 526         }
 527 }
 528
 529 void nvme_start_keep_alive(struct nvme_ctrl *ctrl)
 530 {
 531         if (unlikely(ctrl->kato == 0))
 532                 return;
 533
 534         INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work);
 535         schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
 536 }
 537 EXPORT_SYMBOL_GPL(nvme_start_keep_alive);
 538
 539 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl)
 540 {
 541         if (unlikely(ctrl->kato == 0))
 542                 return;
 543
 544         cancel_delayed_work_sync(&ctrl->ka_work);
 545 }
 546 EXPORT_SYMBOL_GPL(nvme_stop_keep_alive);
 547
 548 int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
 549 {
 550         struct nvme_command c = { };
 551         int error;
 552
 553         /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
 554         c.identify.opcode = nvme_admin_identify;
 555         c.identify.cns = cpu_to_le32(1);
 556
 557         *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
 558         if (!*id)
 559                 return -ENOMEM;
 560
 561         error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
 562                         sizeof(struct nvme_id_ctrl));
 563         if (error)
 564                 kfree(*id);
 565         return error;
 566 }
 567
 568 static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list)
 569 {
 570         struct nvme_command c = { };
 571
 572         c.identify.opcode = nvme_admin_identify;
 573         c.identify.cns = cpu_to_le32(2);
 574         c.identify.nsid = cpu_to_le32(nsid);
 575         return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, 0x1000);
 576 }
 577
 578 int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
 579                 struct nvme_id_ns **id)
 580 {
 581         struct nvme_command c = { };
 582         int error;
 583
 584         /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
 585         c.identify.opcode = nvme_admin_identify,
 586         c.identify.nsid = cpu_to_le32(nsid),
 587
 588         *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL);
 589         if (!*id)
 590                 return -ENOMEM;
 591
 592         error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
 593                         sizeof(struct nvme_id_ns));
 594         if (error)
 595                 kfree(*id);
 596         return error;
 597 }
 598
 599 int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
 600                                         dma_addr_t dma_addr, u32 *result)
 601 {
 602         struct nvme_command c;
 603         struct nvme_completion cqe;
 604         int ret;
 605
 606         memset(&c, 0, sizeof(c));
 607         c.features.opcode = nvme_admin_get_features;
 608         c.features.nsid = cpu_to_le32(nsid);
 609         c.features.dptr.prp1 = cpu_to_le64(dma_addr);
 610         c.features.fid = cpu_to_le32(fid);
 611
 612         ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &cqe, NULL, 0, 0,
 613                         NVME_QID_ANY, 0, 0);
 614         if (ret >= 0 && result)
 615                 *result = le32_to_cpu(cqe.result);
 616         return ret;
 617 }
 618
 619 int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
 620                                         dma_addr_t dma_addr, u32 *result)
 621 {
 622         struct nvme_command c;
 623         struct nvme_completion cqe;
 624         int ret;
 625
 626         memset(&c, 0, sizeof(c));
 627         c.features.opcode = nvme_admin_set_features;
 628         c.features.dptr.prp1 = cpu_to_le64(dma_addr);
 629         c.features.fid = cpu_to_le32(fid);
 630         c.features.dword11 = cpu_to_le32(dword11);
 631
 632         ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &cqe, NULL, 0, 0,
 633                         NVME_QID_ANY, 0, 0);
 634         if (ret >= 0 && result)
 635                 *result = le32_to_cpu(cqe.result);
 636         return ret;
 637 }
 638
 639 int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log)
 640 {
 641         struct nvme_command c = { };
 642         int error;
 643
 644         c.common.opcode = nvme_admin_get_log_page,
 645         c.common.nsid = cpu_to_le32(0xFFFFFFFF),
 646         c.common.cdw10[0] = cpu_to_le32(
 647                         (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) |
 648                          NVME_LOG_SMART),
 649
 650         *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL);
 651         if (!*log)
 652                 return -ENOMEM;
 653
 654         error = nvme_submit_sync_cmd(dev->admin_q, &c, *log,
 655                         sizeof(struct nvme_smart_log));
 656         if (error)
 657                 kfree(*log);
 658         return error;
 659 }
 660
 661 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
 662 {
 663         u32 q_count = (*count - 1) | ((*count - 1) << 16);
 664         u32 result;
 665         int status, nr_io_queues;
 666
 667         status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, 0,
 668                         &result);
 669         if (status < 0)
 670                 return status;
 671
 672         /*
 673          * Degraded controllers might return an error when setting the queue
 674          * count.  We still want to be able to bring them online and offer
 675          * access to the admin queue, as that might be only way to fix them up.
 676          */
 677         if (status > 0) {
 678                 dev_err(ctrl->dev, "Could not set queue count (%d)\n", status);
 679                 *count = 0;
 680         } else {
 681                 nr_io_queues = min(result & 0xffff, result >> 16) + 1;
 682                 *count = min(*count, nr_io_queues);
 683         }
 684
 685         return 0;
 686 }
 687 EXPORT_SYMBOL_GPL(nvme_set_queue_count);
 688
 689 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
 690 {
 691         struct nvme_user_io io;
 692         struct nvme_command c;
 693         unsigned length, meta_len;
 694         void __user *metadata;
 695
 696         if (copy_from_user(&io, uio, sizeof(io)))
 697                 return -EFAULT;
 698         if (io.flags)
 699                 return -EINVAL;
 700
 701         switch (io.opcode) {
 702         case nvme_cmd_write:
 703         case nvme_cmd_read:
 704         case nvme_cmd_compare:
 705                 break;
 706         default:
 707                 return -EINVAL;
 708         }
 709
 710         length = (io.nblocks + 1) << ns->lba_shift;
 711         meta_len = (io.nblocks + 1) * ns->ms;
 712         metadata = (void __user *)(uintptr_t)io.metadata;
 713
 714         if (ns->ext) {
 715                 length += meta_len;
 716                 meta_len = 0;
 717         } else if (meta_len) {
 718                 if ((io.metadata & 3) || !io.metadata)
 719                         return -EINVAL;
 720         }
 721
 722         memset(&c, 0, sizeof(c));
 723         c.rw.opcode = io.opcode;
 724         c.rw.flags = io.flags;
 725         c.rw.nsid = cpu_to_le32(ns->ns_id);
 726         c.rw.slba = cpu_to_le64(io.slba);
 727         c.rw.length = cpu_to_le16(io.nblocks);
 728         c.rw.control = cpu_to_le16(io.control);
 729         c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
 730         c.rw.reftag = cpu_to_le32(io.reftag);
 731         c.rw.apptag = cpu_to_le16(io.apptag);
 732         c.rw.appmask = cpu_to_le16(io.appmask);
 733
 734         return __nvme_submit_user_cmd(ns->queue, &c,
 735                         (void __user *)(uintptr_t)io.addr, length,
 736                         metadata, meta_len, io.slba, NULL, 0);
 737 }
 738
 739 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 740                         struct nvme_passthru_cmd __user *ucmd)
 741 {
 742         struct nvme_passthru_cmd cmd;
 743         struct nvme_command c;
 744         unsigned timeout = 0;
 745         int status;
 746
 747         if (!capable(CAP_SYS_ADMIN))
 748                 return -EACCES;
 749         if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
 750                 return -EFAULT;
 751         if (cmd.flags)
 752                 return -EINVAL;
 753
 754         memset(&c, 0, sizeof(c));
 755         c.common.opcode = cmd.opcode;
 756         c.common.flags = cmd.flags;
 757         c.common.nsid = cpu_to_le32(cmd.nsid);
 758         c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
 759         c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
 760         c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
 761         c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
 762         c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
 763         c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
 764         c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
 765         c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);
 766
 767         if (cmd.timeout_ms)
 768                 timeout = msecs_to_jiffies(cmd.timeout_ms);
 769
 770         status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
 771                         (void __user *)(uintptr_t)cmd.addr, cmd.data_len,
 772                         &cmd.result, timeout);
 773         if (status >= 0) {
 774                 if (put_user(cmd.result, &ucmd->result))
 775                         return -EFAULT;
 776         }
 777
 778         return status;
 779 }
 780
 781 static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
 782                 unsigned int cmd, unsigned long arg)
 783 {
 784         struct nvme_ns *ns = bdev->bd_disk->private_data;
 785
 786         switch (cmd) {
 787         case NVME_IOCTL_ID:
 788                 force_successful_syscall_return();
 789                 return ns->ns_id;
 790         case NVME_IOCTL_ADMIN_CMD:
 791                 return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg);
 792         case NVME_IOCTL_IO_CMD:
 793                 return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg);
 794         case NVME_IOCTL_SUBMIT_IO:
 795                 return nvme_submit_io(ns, (void __user *)arg);
 796 #ifdef CONFIG_BLK_DEV_NVME_SCSI
 797         case SG_GET_VERSION_NUM:
 798                 return nvme_sg_get_version_num((void __user *)arg);
 799         case SG_IO:
 800                 return nvme_sg_io(ns, (void __user *)arg);
 801 #endif
 802         default:
 803                 return -ENOTTY;
 804         }
 805 }
 806
 807 #ifdef CONFIG_COMPAT
 808 static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
 809                         unsigned int cmd, unsigned long arg)
 810 {
 811         switch (cmd) {
 812         case SG_IO:
 813                 return -ENOIOCTLCMD;
 814         }
 815         return nvme_ioctl(bdev, mode, cmd, arg);
 816 }
 817 #else
 818 #define nvme_compat_ioctl       NULL
 819 #endif
 820
 821 static int nvme_open(struct block_device *bdev, fmode_t mode)
 822 {
 823         return nvme_get_ns_from_disk(bdev->bd_disk) ? 0 : -ENXIO;
 824 }
 825
 826 static void nvme_release(struct gendisk *disk, fmode_t mode)
 827 {
 828         struct nvme_ns *ns = disk->private_data;
 829
 830         module_put(ns->ctrl->ops->module);
 831         nvme_put_ns(ns);
 832 }
 833
 834 static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 835 {
 836         /* some standard values */
 837         geo->heads = 1 << 6;
 838         geo->sectors = 1 << 5;
 839         geo->cylinders = get_capacity(bdev->bd_disk) >> 11;
 840         return 0;
 841 }
 842
 843 #ifdef CONFIG_BLK_DEV_INTEGRITY
 844 static void nvme_init_integrity(struct nvme_ns *ns)
 845 {
 846         struct blk_integrity integrity;
 847
 848         memset(&integrity, 0, sizeof(integrity));
 849         switch (ns->pi_type) {
 850         case NVME_NS_DPS_PI_TYPE3:
 851                 integrity.profile = &t10_pi_type3_crc;
 852                 integrity.tag_size = sizeof(u16) + sizeof(u32);
 853                 integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
 854                 break;
 855         case NVME_NS_DPS_PI_TYPE1:
 856         case NVME_NS_DPS_PI_TYPE2:
 857                 integrity.profile = &t10_pi_type1_crc;
 858                 integrity.tag_size = sizeof(u16);
 859                 integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
 860                 break;
 861         default:
 862                 integrity.profile = NULL;
 863                 break;
 864         }
 865         integrity.tuple_size = ns->ms;
 866         blk_integrity_register(ns->disk, &integrity);
 867         blk_queue_max_integrity_segments(ns->queue, 1);
 868 }
 869 #else
 870 static void nvme_init_integrity(struct nvme_ns *ns)
 871 {
 872 }
 873 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 874
 875 static void nvme_config_discard(struct nvme_ns *ns)
 876 {
 877         struct nvme_ctrl *ctrl = ns->ctrl;
 878         u32 logical_block_size = queue_logical_block_size(ns->queue);
 879
 880         if (ctrl->quirks & NVME_QUIRK_DISCARD_ZEROES)
 881                 ns->queue->limits.discard_zeroes_data = 1;
 882         else
 883                 ns->queue->limits.discard_zeroes_data = 0;
 884
 885         ns->queue->limits.discard_alignment = logical_block_size;
 886         ns->queue->limits.discard_granularity = logical_block_size;
 887         blk_queue_max_discard_sectors(ns->queue, UINT_MAX);
 888         queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue);
 889 }
 890
 891 static int nvme_revalidate_disk(struct gendisk *disk)
 892 {
 893         struct nvme_ns *ns = disk->private_data;
 894         struct nvme_id_ns *id;
 895         u8 lbaf, pi_type;
 896         u16 old_ms;
 897         unsigned short bs;
 898
 899         if (test_bit(NVME_NS_DEAD, &ns->flags)) {
 900                 set_capacity(disk, 0);
 901                 return -ENODEV;
 902         }
 903         if (nvme_identify_ns(ns->ctrl, ns->ns_id, &id)) {
 904                 dev_warn(disk_to_dev(ns->disk), "%s: Identify failure\n",
 905                                 __func__);
 906                 return -ENODEV;
 907         }
 908         if (id->ncap == 0) {
 909                 kfree(id);
 910                 return -ENODEV;
 911         }
 912
 913         if (nvme_nvm_ns_supported(ns, id) && ns->type != NVME_NS_LIGHTNVM) {
 914                 if (nvme_nvm_register(ns->queue, disk->disk_name)) {
 915                         dev_warn(disk_to_dev(ns->disk),
 916                                 "%s: LightNVM init failure\n", __func__);
 917                         kfree(id);
 918                         return -ENODEV;
 919                 }
 920                 ns->type = NVME_NS_LIGHTNVM;
 921         }
 922
 923         if (ns->ctrl->vs >= NVME_VS(1, 1))
 924                 memcpy(ns->eui, id->eui64, sizeof(ns->eui));
 925         if (ns->ctrl->vs >= NVME_VS(1, 2))
 926                 memcpy(ns->uuid, id->nguid, sizeof(ns->uuid));
 927
 928         old_ms = ns->ms;
 929         lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK;
 930         ns->lba_shift = id->lbaf[lbaf].ds;
 931         ns->ms = le16_to_cpu(id->lbaf[lbaf].ms);
 932         ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
 933
 934         /*
 935          * If identify namespace failed, use default 512 byte block size so
 936          * block layer can use before failing read/write for 0 capacity.
 937          */
 938         if (ns->lba_shift == 0)
 939                 ns->lba_shift = 9;
 940         bs = 1 << ns->lba_shift;
 941         /* XXX: PI implementation requires metadata equal t10 pi tuple size */
 942         pi_type = ns->ms == sizeof(struct t10_pi_tuple) ?
 943                                         id->dps & NVME_NS_DPS_PI_MASK : 0;
 944
 945         blk_mq_freeze_queue(disk->queue);
 946         if (blk_get_integrity(disk) && (ns->pi_type != pi_type ||
 947                                 ns->ms != old_ms ||
 948                                 bs != queue_logical_block_size(disk->queue) ||
 949                                 (ns->ms && ns->ext)))
 950                 blk_integrity_unregister(disk);
 951
 952         ns->pi_type = pi_type;
 953         blk_queue_logical_block_size(ns->queue, bs);
 954
 955         if (ns->ms && !blk_get_integrity(disk) && !ns->ext)
 956                 nvme_init_integrity(ns);
 957         if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk))
 958                 set_capacity(disk, 0);
 959         else
 960                 set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
 961
 962         if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM)
 963                 nvme_config_discard(ns);
 964         blk_mq_unfreeze_queue(disk->queue);
 965
 966         kfree(id);
 967         return 0;
 968 }
 969
 970 static char nvme_pr_type(enum pr_type type)
 971 {
 972         switch (type) {
 973         case PR_WRITE_EXCLUSIVE:
 974                 return 1;
 975         case PR_EXCLUSIVE_ACCESS:
 976                 return 2;
 977         case PR_WRITE_EXCLUSIVE_REG_ONLY:
 978                 return 3;
 979         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
 980                 return 4;
 981         case PR_WRITE_EXCLUSIVE_ALL_REGS:
 982                 return 5;
 983         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
 984                 return 6;
 985         default:
 986                 return 0;
 987         }
 988 };
 989
 990 static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
 991                                 u64 key, u64 sa_key, u8 op)
 992 {
 993         struct nvme_ns *ns = bdev->bd_disk->private_data;
 994         struct nvme_command c;
 995         u8 data[16] = { 0, };
 996
 997         put_unaligned_le64(key, &data[0]);
 998         put_unaligned_le64(sa_key, &data[8]);
 999
1000         memset(&c, 0, sizeof(c));
1001         c.common.opcode = op;
1002         c.common.nsid = cpu_to_le32(ns->ns_id);
1003         c.common.cdw10[0] = cpu_to_le32(cdw10);
1004
1005         return nvme_submit_sync_cmd(ns->queue, &c, data, 16);
1006 }
1007
1008 static int nvme_pr_register(struct block_device *bdev, u64 old,
1009                 u64 new, unsigned flags)
1010 {
1011         u32 cdw10;
1012
1013         if (flags & ~PR_FL_IGNORE_KEY)
1014                 return -EOPNOTSUPP;
1015
1016         cdw10 = old ? 2 : 0;
1017         cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;
1018         cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */
1019         return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);
1020 }
1021
1022 static int nvme_pr_reserve(struct block_device *bdev, u64 key,
1023                 enum pr_type type, unsigned flags)
1024 {
1025         u32 cdw10;
1026
1027         if (flags & ~PR_FL_IGNORE_KEY)
1028                 return -EOPNOTSUPP;
1029
1030         cdw10 = nvme_pr_type(type) << 8;
1031         cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);
1032         return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);
1033 }
1034
1035 static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,
1036                 enum pr_type type, bool abort)
1037 {
1038         u32 cdw10 = nvme_pr_type(type) << 8 | abort ? 2 : 1;
1039         return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);
1040 }
1041
1042 static int nvme_pr_clear(struct block_device *bdev, u64 key)
1043 {
1044         u32 cdw10 = 1 | (key ? 1 << 3 : 0);
1045         return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);
1046 }
1047
1048 static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1049 {
1050         u32 cdw10 = nvme_pr_type(type) << 8 | key ? 1 << 3 : 0;
1051         return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
1052 }
1053
1054 static const struct pr_ops nvme_pr_ops = {
1055         .pr_register    = nvme_pr_register,
1056         .pr_reserve     = nvme_pr_reserve,
1057         .pr_release     = nvme_pr_release,
1058         .pr_preempt     = nvme_pr_preempt,
1059         .pr_clear       = nvme_pr_clear,
1060 };
1061
1062 static const struct block_device_operations nvme_fops = {
1063         .owner          = THIS_MODULE,
1064         .ioctl          = nvme_ioctl,
1065         .compat_ioctl   = nvme_compat_ioctl,
1066         .open           = nvme_open,
1067         .release        = nvme_release,
1068         .getgeo         = nvme_getgeo,
1069         .revalidate_disk= nvme_revalidate_disk,
1070         .pr_ops         = &nvme_pr_ops,
1071 };
1072
1073 static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
1074 {
1075         unsigned long timeout =
1076                 ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
1077         u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
1078         int ret;
1079
1080         while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
1081                 if ((csts & NVME_CSTS_RDY) == bit)
1082                         break;
1083
1084                 msleep(100);
1085                 if (fatal_signal_pending(current))
1086                         return -EINTR;
1087                 if (time_after(jiffies, timeout)) {
1088                         dev_err(ctrl->device,
1089                                 "Device not ready; aborting %s\n", enabled ?
1090                                                 "initialisation" : "reset");
1091                         return -ENODEV;
1092                 }
1093         }
1094
1095         return ret;
1096 }
1097
1098 /*
1099  * If the device has been passed off to us in an enabled state, just clear
1100  * the enabled bit.  The spec says we should set the 'shutdown notification
1101  * bits', but doing so may cause the device to complete commands to the
1102  * admin queue ... and we don't know what memory that might be pointing at!
1103  */
1104 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
1105 {
1106         int ret;
1107
1108         ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
1109         ctrl->ctrl_config &= ~NVME_CC_ENABLE;
1110
1111         ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1112         if (ret)
1113                 return ret;
1114
1115         /* Checking for ctrl->tagset is a trick to avoid sleeping on module
1116          * load, since we only need the quirk on reset_controller. Notice
1117          * that the HGST device needs this delay only in firmware activation
1118          * procedure; unfortunately we have no (easy) way to verify this.
1119          */
1120         if ((ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY) && ctrl->tagset)
1121                 msleep(NVME_QUIRK_DELAY_AMOUNT);
1122
1123         return nvme_wait_ready(ctrl, cap, false);
1124 }
1125 EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
1126
1127 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
1128 {
1129         /*
1130          * Default to a 4K page size, with the intention to update this
1131          * path in the future to accomodate architectures with differing
1132          * kernel and IO page sizes.
1133          */
1134         unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12;
1135         int ret;
1136
1137         if (page_shift < dev_page_min) {
1138                 dev_err(ctrl->device,
1139                         "Minimum device page size %u too large for host (%u)\n",
1140                         1 << dev_page_min, 1 << page_shift);
1141                 return -ENODEV;
1142         }
1143
1144         ctrl->page_size = 1 << page_shift;
1145
1146         ctrl->ctrl_config = NVME_CC_CSS_NVM;
1147         ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
1148         ctrl->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
1149         ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
1150         ctrl->ctrl_config |= NVME_CC_ENABLE;
1151
1152         ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1153         if (ret)
1154                 return ret;
1155         return nvme_wait_ready(ctrl, cap, true);
1156 }
1157 EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
1158
1159 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
1160 {
1161         unsigned long timeout = SHUTDOWN_TIMEOUT + jiffies;
1162         u32 csts;
1163         int ret;
1164
1165         ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
1166         ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
1167
1168         ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1169         if (ret)
1170                 return ret;
1171
1172         while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
1173                 if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
1174                         break;
1175
1176                 msleep(100);
1177                 if (fatal_signal_pending(current))
1178                         return -EINTR;
1179                 if (time_after(jiffies, timeout)) {
1180                         dev_err(ctrl->device,
1181                                 "Device shutdown incomplete; abort shutdown\n");
1182                         return -ENODEV;
1183                 }
1184         }
1185
1186         return ret;
1187 }
1188 EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
1189
1190 static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
1191                 struct request_queue *q)
1192 {
1193         bool vwc = false;
1194
1195         if (ctrl->max_hw_sectors) {
1196                 u32 max_segments =
1197                         (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;
1198
1199                 blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
1200                 blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
1201         }
1202         if (ctrl->stripe_size)
1203                 blk_queue_chunk_sectors(q, ctrl->stripe_size >> 9);
1204         blk_queue_virt_boundary(q, ctrl->page_size - 1);
1205         if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
1206                 vwc = true;
1207         blk_queue_write_cache(q, vwc, vwc);
1208 }
1209
1210 /*
1211  * Initialize the cached copies of the Identify data and various controller
1212  * register in our nvme_ctrl structure.  This should be called as soon as
1213  * the admin queue is fully up and running.
1214  */
1215 int nvme_init_identify(struct nvme_ctrl *ctrl)
1216 {
1217         struct nvme_id_ctrl *id;
1218         u64 cap;
1219         int ret, page_shift;
1220         u32 max_hw_sectors;
1221
1222         ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
1223         if (ret) {
1224                 dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
1225                 return ret;
1226         }
1227
1228         ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
1229         if (ret) {
1230                 dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
1231                 return ret;
1232         }
1233         page_shift = NVME_CAP_MPSMIN(cap) + 12;
1234
1235         if (ctrl->vs >= NVME_VS(1, 1))
1236                 ctrl->subsystem = NVME_CAP_NSSRC(cap);
1237
1238         ret = nvme_identify_ctrl(ctrl, &id);
1239         if (ret) {
1240                 dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
1241                 return -EIO;
1242         }
1243
1244         ctrl->vid = le16_to_cpu(id->vid);
1245         ctrl->oncs = le16_to_cpup(&id->oncs);
1246         atomic_set(&ctrl->abort_limit, id->acl + 1);
1247         ctrl->vwc = id->vwc;
1248         ctrl->cntlid = le16_to_cpup(&id->cntlid);
1249         memcpy(ctrl->serial, id->sn, sizeof(id->sn));
1250         memcpy(ctrl->model, id->mn, sizeof(id->mn));
1251         memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr));
1252         if (id->mdts)
1253                 max_hw_sectors = 1 << (id->mdts + page_shift - 9);
1254         else
1255                 max_hw_sectors = UINT_MAX;
1256         ctrl->max_hw_sectors =
1257                 min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
1258
1259         if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && id->vs[3]) {
1260                 unsigned int max_hw_sectors;
1261
1262                 ctrl->stripe_size = 1 << (id->vs[3] + page_shift);
1263                 max_hw_sectors = ctrl->stripe_size >> (page_shift - 9);
1264                 if (ctrl->max_hw_sectors) {
1265                         ctrl->max_hw_sectors = min(max_hw_sectors,
1266                                                         ctrl->max_hw_sectors);
1267                 } else {
1268                         ctrl->max_hw_sectors = max_hw_sectors;
1269                 }
1270         }
1271
1272         nvme_set_queue_limits(ctrl, ctrl->admin_q);
1273         ctrl->sgls = le32_to_cpu(id->sgls);
1274         ctrl->kas = le16_to_cpu(id->kas);
1275
1276         if (ctrl->ops->is_fabrics) {
1277                 ctrl->icdoff = le16_to_cpu(id->icdoff);
1278                 ctrl->ioccsz = le32_to_cpu(id->ioccsz);
1279                 ctrl->iorcsz = le32_to_cpu(id->iorcsz);
1280                 ctrl->maxcmd = le16_to_cpu(id->maxcmd);
1281
1282                 /*
1283                  * In fabrics we need to verify the cntlid matches the
1284                  * admin connect
1285                  */
1286                 if (ctrl->cntlid != le16_to_cpu(id->cntlid))
1287                         ret = -EINVAL;
1288
1289                 if (!ctrl->opts->discovery_nqn && !ctrl->kas) {
1290                         dev_err(ctrl->dev,
1291                                 "keep-alive support is mandatory for fabrics\n");
1292                         ret = -EINVAL;
1293                 }
1294         } else {
1295                 ctrl->cntlid = le16_to_cpu(id->cntlid);
1296         }
1297
1298         kfree(id);
1299         return ret;
1300 }
1301 EXPORT_SYMBOL_GPL(nvme_init_identify);
1302
1303 static int nvme_dev_open(struct inode *inode, struct file *file)
1304 {
1305         struct nvme_ctrl *ctrl;
1306         int instance = iminor(inode);
1307         int ret = -ENODEV;
1308
1309         spin_lock(&dev_list_lock);
1310         list_for_each_entry(ctrl, &nvme_ctrl_list, node) {
1311                 if (ctrl->instance != instance)
1312                         continue;
1313
1314                 if (!ctrl->admin_q) {
1315                         ret = -EWOULDBLOCK;
1316                         break;
1317                 }
1318                 if (!kref_get_unless_zero(&ctrl->kref))
1319                         break;
1320                 file->private_data = ctrl;
1321                 ret = 0;
1322                 break;
1323         }
1324         spin_unlock(&dev_list_lock);
1325
1326         return ret;
1327 }
1328
1329 static int nvme_dev_release(struct inode *inode, struct file *file)
1330 {
1331         nvme_put_ctrl(file->private_data);
1332         return 0;
1333 }
1334
1335 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
1336 {
1337         struct nvme_ns *ns;
1338         int ret;
1339
1340         mutex_lock(&ctrl->namespaces_mutex);
1341         if (list_empty(&ctrl->namespaces)) {
1342                 ret = -ENOTTY;
1343                 goto out_unlock;
1344         }
1345
1346         ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
1347         if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
1348                 dev_warn(ctrl->device,
1349                         "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
1350                 ret = -EINVAL;
1351                 goto out_unlock;
1352         }
1353
1354         dev_warn(ctrl->device,
1355                 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
1356         kref_get(&ns->kref);
1357         mutex_unlock(&ctrl->namespaces_mutex);
1358
1359         ret = nvme_user_cmd(ctrl, ns, argp);
1360         nvme_put_ns(ns);
1361         return ret;
1362
1363 out_unlock:
1364         mutex_unlock(&ctrl->namespaces_mutex);
1365         return ret;
1366 }
1367
1368 static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
1369                 unsigned long arg)
1370 {
1371         struct nvme_ctrl *ctrl = file->private_data;
1372         void __user *argp = (void __user *)arg;
1373
1374         switch (cmd) {
1375         case NVME_IOCTL_ADMIN_CMD:
1376                 return nvme_user_cmd(ctrl, NULL, argp);
1377         case NVME_IOCTL_IO_CMD:
1378                 return nvme_dev_user_cmd(ctrl, argp);
1379         case NVME_IOCTL_RESET:
1380                 dev_warn(ctrl->device, "resetting controller\n");
1381                 return ctrl->ops->reset_ctrl(ctrl);
1382         case NVME_IOCTL_SUBSYS_RESET:
1383                 return nvme_reset_subsystem(ctrl);
1384         case NVME_IOCTL_RESCAN:
1385                 nvme_queue_scan(ctrl);
1386                 return 0;
1387         default:
1388                 return -ENOTTY;
1389         }
1390 }
1391
1392 static const struct file_operations nvme_dev_fops = {
1393         .owner          = THIS_MODULE,
1394         .open           = nvme_dev_open,
1395         .release        = nvme_dev_release,
1396         .unlocked_ioctl = nvme_dev_ioctl,
1397         .compat_ioctl   = nvme_dev_ioctl,
1398 };
1399
1400 static ssize_t nvme_sysfs_reset(struct device *dev,
1401                                 struct device_attribute *attr, const char *buf,
1402                                 size_t count)
1403 {
1404         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
1405         int ret;
1406
1407         ret = ctrl->ops->reset_ctrl(ctrl);
1408         if (ret < 0)
1409                 return ret;
1410         return count;
1411 }
1412 static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
1413
1414 static ssize_t nvme_sysfs_rescan(struct device *dev,
1415                                 struct device_attribute *attr, const char *buf,
1416                                 size_t count)
1417 {
1418         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
1419
1420         nvme_queue_scan(ctrl);
1421         return count;
1422 }
1423 static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan);
1424
1425 static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
1426                                                                 char *buf)
1427 {
1428         struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1429         struct nvme_ctrl *ctrl = ns->ctrl;
1430         int serial_len = sizeof(ctrl->serial);
1431         int model_len = sizeof(ctrl->model);
1432
1433         if (memchr_inv(ns->uuid, 0, sizeof(ns->uuid)))
1434                 return sprintf(buf, "eui.%16phN\n", ns->uuid);
1435
1436         if (memchr_inv(ns->eui, 0, sizeof(ns->eui)))
1437                 return sprintf(buf, "eui.%8phN\n", ns->eui);
1438
1439         while (ctrl->serial[serial_len - 1] == ' ')
1440                 serial_len--;
1441         while (ctrl->model[model_len - 1] == ' ')
1442                 model_len--;
1443
1444         return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", ctrl->vid,
1445                 serial_len, ctrl->serial, model_len, ctrl->model, ns->ns_id);
1446 }
1447 static DEVICE_ATTR(wwid, S_IRUGO, wwid_show, NULL);
1448
1449 static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
1450                                                                 char *buf)
1451 {
1452         struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1453         return sprintf(buf, "%pU\n", ns->uuid);
1454 }
1455 static DEVICE_ATTR(uuid, S_IRUGO, uuid_show, NULL);
1456
1457 static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
1458                                                                 char *buf)
1459 {
1460         struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1461         return sprintf(buf, "%8phd\n", ns->eui);
1462 }
1463 static DEVICE_ATTR(eui, S_IRUGO, eui_show, NULL);
1464
1465 static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
1466                                                                 char *buf)
1467 {
1468         struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1469         return sprintf(buf, "%d\n", ns->ns_id);
1470 }
1471 static DEVICE_ATTR(nsid, S_IRUGO, nsid_show, NULL);
1472
1473 static struct attribute *nvme_ns_attrs[] = {
1474         &dev_attr_wwid.attr,
1475         &dev_attr_uuid.attr,
1476         &dev_attr_eui.attr,
1477         &dev_attr_nsid.attr,
1478         NULL,
1479 };
1480
1481 static umode_t nvme_ns_attrs_are_visible(struct kobject *kobj,
1482                 struct attribute *a, int n)
1483 {
1484         struct device *dev = container_of(kobj, struct device, kobj);
1485         struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1486
1487         if (a == &dev_attr_uuid.attr) {
1488                 if (!memchr_inv(ns->uuid, 0, sizeof(ns->uuid)))
1489                         return 0;
1490         }
1491         if (a == &dev_attr_eui.attr) {
1492                 if (!memchr_inv(ns->eui, 0, sizeof(ns->eui)))
1493                         return 0;
1494         }
1495         return a->mode;
1496 }
1497
1498 static const struct attribute_group nvme_ns_attr_group = {
1499         .attrs          = nvme_ns_attrs,
1500         .is_visible     = nvme_ns_attrs_are_visible,
1501 };
1502
1503 #define nvme_show_str_function(field)                                           \
1504 static ssize_t  field##_show(struct device *dev,                                \
1505                             struct device_attribute *attr, char *buf)           \
1506 {                                                                               \
1507         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);                          \
1508         return sprintf(buf, "%.*s\n", (int)sizeof(ctrl->field), ctrl->field);   \
1509 }                                                                               \
1510 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
1511
1512 #define nvme_show_int_function(field)                                           \
1513 static ssize_t  field##_show(struct device *dev,                                \
1514                             struct device_attribute *attr, char *buf)           \
1515 {                                                                               \
1516         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);                          \
1517         return sprintf(buf, "%d\n", ctrl->field);       \
1518 }                                                                               \
1519 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
1520
1521 nvme_show_str_function(model);
1522 nvme_show_str_function(serial);
1523 nvme_show_str_function(firmware_rev);
1524 nvme_show_int_function(cntlid);
1525
1526 static ssize_t nvme_sysfs_delete(struct device *dev,
1527                                 struct device_attribute *attr, const char *buf,
1528                                 size_t count)
1529 {
1530         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
1531
1532         if (device_remove_file_self(dev, attr))
1533                 ctrl->ops->delete_ctrl(ctrl);
1534         return count;
1535 }
1536 static DEVICE_ATTR(delete_controller, S_IWUSR, NULL, nvme_sysfs_delete);
1537
1538 static ssize_t nvme_sysfs_show_transport(struct device *dev,
1539                                          struct device_attribute *attr,
1540                                          char *buf)
1541 {
1542         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
1543
1544         return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->ops->name);
1545 }
1546 static DEVICE_ATTR(transport, S_IRUGO, nvme_sysfs_show_transport, NULL);
1547
1548 static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev,
1549                                          struct device_attribute *attr,
1550                                          char *buf)
1551 {
1552         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
1553
1554         return snprintf(buf, PAGE_SIZE, "%s\n",
1555                         ctrl->ops->get_subsysnqn(ctrl));
1556 }
1557 static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL);
1558
1559 static ssize_t nvme_sysfs_show_address(struct device *dev,
1560                                          struct device_attribute *attr,
1561                                          char *buf)
1562 {
1563         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
1564
1565         return ctrl->ops->get_address(ctrl, buf, PAGE_SIZE);
1566 }
1567 static DEVICE_ATTR(address, S_IRUGO, nvme_sysfs_show_address, NULL);
1568
1569 static struct attribute *nvme_dev_attrs[] = {
1570         &dev_attr_reset_controller.attr,
1571         &dev_attr_rescan_controller.attr,
1572         &dev_attr_model.attr,
1573         &dev_attr_serial.attr,
1574         &dev_attr_firmware_rev.attr,
1575         &dev_attr_cntlid.attr,
1576         &dev_attr_delete_controller.attr,
1577         &dev_attr_transport.attr,
1578         &dev_attr_subsysnqn.attr,
1579         &dev_attr_address.attr,
1580         NULL
1581 };
1582
1583 #define CHECK_ATTR(ctrl, a, name)               \
1584         if ((a) == &dev_attr_##name.attr &&     \
1585             !(ctrl)->ops->get_##name)           \
1586                 return 0
1587
1588 static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
1589                 struct attribute *a, int n)
1590 {
1591         struct device *dev = container_of(kobj, struct device, kobj);
1592         struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
1593
1594         if (a == &dev_attr_delete_controller.attr) {
1595                 if (!ctrl->ops->delete_ctrl)
1596                         return 0;
1597         }
1598
1599         CHECK_ATTR(ctrl, a, subsysnqn);
1600         CHECK_ATTR(ctrl, a, address);
1601
1602         return a->mode;
1603 }
1604
1605 static struct attribute_group nvme_dev_attrs_group = {
1606         .attrs          = nvme_dev_attrs,
1607         .is_visible     = nvme_dev_attrs_are_visible,
1608 };
1609
1610 static const struct attribute_group *nvme_dev_attr_groups[] = {
1611         &nvme_dev_attrs_group,
1612         NULL,
1613 };
1614
1615 static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
1616 {
1617         struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
1618         struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
1619
1620         return nsa->ns_id - nsb->ns_id;
1621 }
1622
1623 static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1624 {
1625         struct nvme_ns *ns, *ret = NULL;
1626
1627         mutex_lock(&ctrl->namespaces_mutex);
1628         list_for_each_entry(ns, &ctrl->namespaces, list) {
1629                 if (ns->ns_id == nsid) {
1630                         kref_get(&ns->kref);
1631                         ret = ns;
1632                         break;
1633                 }
1634                 if (ns->ns_id > nsid)
1635                         break;
1636         }
1637         mutex_unlock(&ctrl->namespaces_mutex);
1638         return ret;
1639 }
1640
1641 static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1642 {
1643         struct nvme_ns *ns;
1644         struct gendisk *disk;
1645         int node = dev_to_node(ctrl->dev);
1646
1647         ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
1648         if (!ns)
1649                 return;
1650
1651         ns->instance = ida_simple_get(&ctrl->ns_ida, 1, 0, GFP_KERNEL);
1652         if (ns->instance < 0)
1653                 goto out_free_ns;
1654
1655         ns->queue = blk_mq_init_queue(ctrl->tagset);
1656         if (IS_ERR(ns->queue))
1657                 goto out_release_instance;
1658         queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
1659         ns->queue->queuedata = ns;
1660         ns->ctrl = ctrl;
1661
1662         disk = alloc_disk_node(0, node);
1663         if (!disk)
1664                 goto out_free_queue;
1665
1666         kref_init(&ns->kref);
1667         ns->ns_id = nsid;
1668         ns->disk = disk;
1669         ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */
1670
1671
1672         blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
1673         nvme_set_queue_limits(ctrl, ns->queue);
1674
1675         disk->fops = &nvme_fops;
1676         disk->private_data = ns;
1677         disk->queue = ns->queue;
1678         disk->flags = GENHD_FL_EXT_DEVT;
1679         sprintf(disk->disk_name, "nvme%dn%d", ctrl->instance, ns->instance);
1680
1681         if (nvme_revalidate_disk(ns->disk))
1682                 goto out_free_disk;
1683
1684         mutex_lock(&ctrl->namespaces_mutex);
1685         list_add_tail(&ns->list, &ctrl->namespaces);
1686         mutex_unlock(&ctrl->namespaces_mutex);
1687
1688         kref_get(&ctrl->kref);
1689         if (ns->type == NVME_NS_LIGHTNVM)
1690                 return;
1691
1692         device_add_disk(ctrl->device, ns->disk);
1693         if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
1694                                         &nvme_ns_attr_group))
1695                 pr_warn("%s: failed to create sysfs group for identification\n",
1696                         ns->disk->disk_name);
1697         return;
1698  out_free_disk:
1699         kfree(disk);
1700  out_free_queue:
1701         blk_cleanup_queue(ns->queue);
1702  out_release_instance:
1703         ida_simple_remove(&ctrl->ns_ida, ns->instance);
1704  out_free_ns:
1705         kfree(ns);
1706 }
1707
1708 static void nvme_ns_remove(struct nvme_ns *ns)
1709 {
1710         if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
1711                 return;
1712
1713         if (ns->disk->flags & GENHD_FL_UP) {
1714                 if (blk_get_integrity(ns->disk))
1715                         blk_integrity_unregister(ns->disk);
1716                 sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
1717                                         &nvme_ns_attr_group);
1718                 del_gendisk(ns->disk);
1719                 blk_mq_abort_requeue_list(ns->queue);
1720                 blk_cleanup_queue(ns->queue);
1721         }
1722
1723         mutex_lock(&ns->ctrl->namespaces_mutex);
1724         list_del_init(&ns->list);
1725         mutex_unlock(&ns->ctrl->namespaces_mutex);
1726
1727         nvme_put_ns(ns);
1728 }
1729
1730 static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1731 {
1732         struct nvme_ns *ns;
1733
1734         ns = nvme_find_get_ns(ctrl, nsid);
1735         if (ns) {
1736                 if (revalidate_disk(ns->disk))
1737                         nvme_ns_remove(ns);
1738                 nvme_put_ns(ns);
1739         } else
1740                 nvme_alloc_ns(ctrl, nsid);
1741 }
1742
1743 static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
1744                                         unsigned nsid)
1745 {
1746         struct nvme_ns *ns, *next;
1747
1748         list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
1749                 if (ns->ns_id > nsid)
1750                         nvme_ns_remove(ns);
1751         }
1752 }
1753
1754 static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn)
1755 {
1756         struct nvme_ns *ns;
1757         __le32 *ns_list;
1758         unsigned i, j, nsid, prev = 0, num_lists = DIV_ROUND_UP(nn, 1024);
1759         int ret = 0;
1760
1761         ns_list = kzalloc(0x1000, GFP_KERNEL);
1762         if (!ns_list)
1763                 return -ENOMEM;
1764
1765         for (i = 0; i < num_lists; i++) {
1766                 ret = nvme_identify_ns_list(ctrl, prev, ns_list);
1767                 if (ret)
1768                         goto free;
1769
1770                 for (j = 0; j < min(nn, 1024U); j++) {
1771                         nsid = le32_to_cpu(ns_list[j]);
1772                         if (!nsid)
1773                                 goto out;
1774
1775                         nvme_validate_ns(ctrl, nsid);
1776
1777                         while (++prev < nsid) {
1778                                 ns = nvme_find_get_ns(ctrl, prev);
1779                                 if (ns) {
1780                                         nvme_ns_remove(ns);
1781                                         nvme_put_ns(ns);
1782                                 }
1783                         }
1784                 }
1785                 nn -= j;
1786         }
1787  out:
1788         nvme_remove_invalid_namespaces(ctrl, prev);
1789  free:
1790         kfree(ns_list);
1791         return ret;
1792 }
1793
1794 static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn)
1795 {
1796         unsigned i;
1797
1798         for (i = 1; i <= nn; i++)
1799                 nvme_validate_ns(ctrl, i);
1800
1801         nvme_remove_invalid_namespaces(ctrl, nn);
1802 }
1803
1804 static void nvme_scan_work(struct work_struct *work)
1805 {
1806         struct nvme_ctrl *ctrl =
1807                 container_of(work, struct nvme_ctrl, scan_work);
1808         struct nvme_id_ctrl *id;
1809         unsigned nn;
1810
1811         if (ctrl->state != NVME_CTRL_LIVE)
1812                 return;
1813
1814         if (nvme_identify_ctrl(ctrl, &id))
1815                 return;
1816
1817         nn = le32_to_cpu(id->nn);
1818         if (ctrl->vs >= NVME_VS(1, 1) &&
1819             !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) {
1820                 if (!nvme_scan_ns_list(ctrl, nn))
1821                         goto done;
1822         }
1823         nvme_scan_ns_sequential(ctrl, nn);
1824  done:
1825         mutex_lock(&ctrl->namespaces_mutex);
1826         list_sort(NULL, &ctrl->namespaces, ns_cmp);
1827         mutex_unlock(&ctrl->namespaces_mutex);
1828         kfree(id);
1829
1830         if (ctrl->ops->post_scan)
1831                 ctrl->ops->post_scan(ctrl);
1832 }
1833
1834 void nvme_queue_scan(struct nvme_ctrl *ctrl)
1835 {
1836         /*
1837          * Do not queue new scan work when a controller is reset during
1838          * removal.
1839          */
1840         if (ctrl->state == NVME_CTRL_LIVE)
1841                 schedule_work(&ctrl->scan_work);
1842 }
1843 EXPORT_SYMBOL_GPL(nvme_queue_scan);
1844
1845 /*
1846  * This function iterates the namespace list unlocked to allow recovery from
1847  * controller failure. It is up to the caller to ensure the namespace list is
1848  * not modified by scan work while this function is executing.
1849  */
1850 void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
1851 {
1852         struct nvme_ns *ns, *next;
1853
1854         /*
1855          * The dead states indicates the controller was not gracefully
1856          * disconnected. In that case, we won't be able to flush any data while
1857          * removing the namespaces' disks; fail all the queues now to avoid
1858          * potentially having to clean up the failed sync later.
1859          */
1860         if (ctrl->state == NVME_CTRL_DEAD)
1861                 nvme_kill_queues(ctrl);
1862
1863         list_for_each_entry_safe(ns, next, &ctrl->namespaces, list)
1864                 nvme_ns_remove(ns);
1865 }
1866 EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
1867
1868 static void nvme_async_event_work(struct work_struct *work)
1869 {
1870         struct nvme_ctrl *ctrl =
1871                 container_of(work, struct nvme_ctrl, async_event_work);
1872
1873         spin_lock_irq(&ctrl->lock);
1874         while (ctrl->event_limit > 0) {
1875                 int aer_idx = --ctrl->event_limit;
1876
1877                 spin_unlock_irq(&ctrl->lock);
1878                 ctrl->ops->submit_async_event(ctrl, aer_idx);
1879                 spin_lock_irq(&ctrl->lock);
1880         }
1881         spin_unlock_irq(&ctrl->lock);
1882 }
1883
1884 void nvme_complete_async_event(struct nvme_ctrl *ctrl,
1885                 struct nvme_completion *cqe)
1886 {
1887         u16 status = le16_to_cpu(cqe->status) >> 1;
1888         u32 result = le32_to_cpu(cqe->result);
1889
1890         if (status == NVME_SC_SUCCESS || status == NVME_SC_ABORT_REQ) {
1891                 ++ctrl->event_limit;
1892                 schedule_work(&ctrl->async_event_work);
1893         }
1894
1895         if (status != NVME_SC_SUCCESS)
1896                 return;
1897
1898         switch (result & 0xff07) {
1899         case NVME_AER_NOTICE_NS_CHANGED:
1900                 dev_info(ctrl->device, "rescanning\n");
1901                 nvme_queue_scan(ctrl);
1902                 break;
1903         default:
1904                 dev_warn(ctrl->device, "async event result %08x\n", result);
1905         }
1906 }
1907 EXPORT_SYMBOL_GPL(nvme_complete_async_event);
1908
1909 void nvme_queue_async_events(struct nvme_ctrl *ctrl)
1910 {
1911         ctrl->event_limit = NVME_NR_AERS;
1912         schedule_work(&ctrl->async_event_work);
1913 }
1914 EXPORT_SYMBOL_GPL(nvme_queue_async_events);
1915
1916 static DEFINE_IDA(nvme_instance_ida);
1917
1918 static int nvme_set_instance(struct nvme_ctrl *ctrl)
1919 {
1920         int instance, error;
1921
1922         do {
1923                 if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL))
1924                         return -ENODEV;
1925
1926                 spin_lock(&dev_list_lock);
1927                 error = ida_get_new(&nvme_instance_ida, &instance);
1928                 spin_unlock(&dev_list_lock);
1929         } while (error == -EAGAIN);
1930
1931         if (error)
1932                 return -ENODEV;
1933
1934         ctrl->instance = instance;
1935         return 0;
1936 }
1937
1938 static void nvme_release_instance(struct nvme_ctrl *ctrl)
1939 {
1940         spin_lock(&dev_list_lock);
1941         ida_remove(&nvme_instance_ida, ctrl->instance);
1942         spin_unlock(&dev_list_lock);
1943 }
1944
1945 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
1946 {
1947         flush_work(&ctrl->async_event_work);
1948         flush_work(&ctrl->scan_work);
1949         nvme_remove_namespaces(ctrl);
1950
1951         device_destroy(nvme_class, MKDEV(nvme_char_major, ctrl->instance));
1952
1953         spin_lock(&dev_list_lock);
1954         list_del(&ctrl->node);
1955         spin_unlock(&dev_list_lock);
1956 }
1957 EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
1958
1959 static void nvme_free_ctrl(struct kref *kref)
1960 {
1961         struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref);
1962
1963         put_device(ctrl->device);
1964         nvme_release_instance(ctrl);
1965         ida_destroy(&ctrl->ns_ida);
1966
1967         ctrl->ops->free_ctrl(ctrl);
1968 }
1969
1970 void nvme_put_ctrl(struct nvme_ctrl *ctrl)
1971 {
1972         kref_put(&ctrl->kref, nvme_free_ctrl);
1973 }
1974 EXPORT_SYMBOL_GPL(nvme_put_ctrl);
1975
1976 /*
1977  * Initialize a NVMe controller structures.  This needs to be called during
1978  * earliest initialization so that we have the initialized structured around
1979  * during probing.
1980  */
1981 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
1982                 const struct nvme_ctrl_ops *ops, unsigned long quirks)
1983 {
1984         int ret;
1985
1986         ctrl->state = NVME_CTRL_NEW;
1987         spin_lock_init(&ctrl->lock);
1988         INIT_LIST_HEAD(&ctrl->namespaces);
1989         mutex_init(&ctrl->namespaces_mutex);
1990         kref_init(&ctrl->kref);
1991         ctrl->dev = dev;
1992         ctrl->ops = ops;
1993         ctrl->quirks = quirks;
1994         INIT_WORK(&ctrl->scan_work, nvme_scan_work);
1995         INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
1996
1997         ret = nvme_set_instance(ctrl);
1998         if (ret)
1999                 goto out;
2000
2001         ctrl->device = device_create_with_groups(nvme_class, ctrl->dev,
2002                                 MKDEV(nvme_char_major, ctrl->instance),
2003                                 ctrl, nvme_dev_attr_groups,
2004                                 "nvme%d", ctrl->instance);
2005         if (IS_ERR(ctrl->device)) {
2006                 ret = PTR_ERR(ctrl->device);
2007                 goto out_release_instance;
2008         }
2009         get_device(ctrl->device);
2010         ida_init(&ctrl->ns_ida);
2011
2012         spin_lock(&dev_list_lock);
2013         list_add_tail(&ctrl->node, &nvme_ctrl_list);
2014         spin_unlock(&dev_list_lock);
2015
2016         return 0;
2017 out_release_instance:
2018         nvme_release_instance(ctrl);
2019 out:
2020         return ret;
2021 }
2022 EXPORT_SYMBOL_GPL(nvme_init_ctrl);
2023
2024 /**
2025  * nvme_kill_queues(): Ends all namespace queues
2026  * @ctrl: the dead controller that needs to end
2027  *
2028  * Call this function when the driver determines it is unable to get the
2029  * controller in a state capable of servicing IO.
2030  */
2031 void nvme_kill_queues(struct nvme_ctrl *ctrl)
2032 {
2033         struct nvme_ns *ns;
2034
2035         mutex_lock(&ctrl->namespaces_mutex);
2036         list_for_each_entry(ns, &ctrl->namespaces, list) {
2037                 /*
2038                  * Revalidating a dead namespace sets capacity to 0. This will
2039                  * end buffered writers dirtying pages that can't be synced.
2040                  */
2041                 if (!test_and_set_bit(NVME_NS_DEAD, &ns->flags))
2042                         revalidate_disk(ns->disk);
2043
2044                 blk_set_queue_dying(ns->queue);
2045                 blk_mq_abort_requeue_list(ns->queue);
2046                 blk_mq_start_stopped_hw_queues(ns->queue, true);
2047         }
2048         mutex_unlock(&ctrl->namespaces_mutex);
2049 }
2050 EXPORT_SYMBOL_GPL(nvme_kill_queues);
2051
2052 void nvme_stop_queues(struct nvme_ctrl *ctrl)
2053 {
2054         struct nvme_ns *ns;
2055
2056         mutex_lock(&ctrl->namespaces_mutex);
2057         list_for_each_entry(ns, &ctrl->namespaces, list) {
2058                 spin_lock_irq(ns->queue->queue_lock);
2059                 queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue);
2060                 spin_unlock_irq(ns->queue->queue_lock);
2061
2062                 blk_mq_cancel_requeue_work(ns->queue);
2063                 blk_mq_stop_hw_queues(ns->queue);
2064         }
2065         mutex_unlock(&ctrl->namespaces_mutex);
2066 }
2067 EXPORT_SYMBOL_GPL(nvme_stop_queues);
2068
2069 void nvme_start_queues(struct nvme_ctrl *ctrl)
2070 {
2071         struct nvme_ns *ns;
2072
2073         mutex_lock(&ctrl->namespaces_mutex);
2074         list_for_each_entry(ns, &ctrl->namespaces, list) {
2075                 queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue);
2076                 blk_mq_start_stopped_hw_queues(ns->queue, true);
2077                 blk_mq_kick_requeue_list(ns->queue);
2078         }
2079         mutex_unlock(&ctrl->namespaces_mutex);
2080 }
2081 EXPORT_SYMBOL_GPL(nvme_start_queues);
2082
2083 int __init nvme_core_init(void)
2084 {
2085         int result;
2086
2087         result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme",
2088                                                         &nvme_dev_fops);
2089         if (result < 0)
2090                 return result;
2091         else if (result > 0)
2092                 nvme_char_major = result;
2093
2094         nvme_class = class_create(THIS_MODULE, "nvme");
2095         if (IS_ERR(nvme_class)) {
2096                 result = PTR_ERR(nvme_class);
2097                 goto unregister_chrdev;
2098         }
2099
2100         return 0;
2101
2102  unregister_chrdev:
2103         __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
2104         return result;
2105 }
2106
2107 void nvme_core_exit(void)
2108 {
2109         class_destroy(nvme_class);
2110         __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
2111 }
2112
2113 MODULE_LICENSE("GPL");
2114 MODULE_VERSION("1.0");
2115 module_init(nvme_core_init);
2116 module_exit(nvme_core_exit);