2 * NVM Express device driver
3 * Copyright (c) 2011-2014, Intel Corporation.
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.
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
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>
26 #include <linux/ptrace.h>
27 #include <linux/nvme_ioctl.h>
28 #include <linux/t10-pi.h>
30 #include <asm/unaligned.h>
34 #define NVME_MINORS (1U << MINORBITS)
36 unsigned char admin_timeout = 60;
37 module_param(admin_timeout, byte, 0644);
38 MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands");
39 EXPORT_SYMBOL_GPL(admin_timeout);
41 unsigned char nvme_io_timeout = 30;
42 module_param_named(io_timeout, nvme_io_timeout, byte, 0644);
43 MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
44 EXPORT_SYMBOL_GPL(nvme_io_timeout);
46 unsigned char shutdown_timeout = 5;
47 module_param(shutdown_timeout, byte, 0644);
48 MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
50 static int nvme_major;
51 module_param(nvme_major, int, 0);
53 static int nvme_char_major;
54 module_param(nvme_char_major, int, 0);
56 static LIST_HEAD(nvme_ctrl_list);
57 static DEFINE_SPINLOCK(dev_list_lock);
59 static struct class *nvme_class;
61 static void nvme_free_ns(struct kref *kref)
63 struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
65 if (ns->type == NVME_NS_LIGHTNVM)
66 nvme_nvm_unregister(ns->queue, ns->disk->disk_name);
68 spin_lock(&dev_list_lock);
69 ns->disk->private_data = NULL;
70 spin_unlock(&dev_list_lock);
73 ida_simple_remove(&ns->ctrl->ns_ida, ns->instance);
74 nvme_put_ctrl(ns->ctrl);
78 static void nvme_put_ns(struct nvme_ns *ns)
80 kref_put(&ns->kref, nvme_free_ns);
83 static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk)
87 spin_lock(&dev_list_lock);
88 ns = disk->private_data;
90 if (!kref_get_unless_zero(&ns->kref))
92 if (!try_module_get(ns->ctrl->ops->module))
95 spin_unlock(&dev_list_lock);
100 kref_put(&ns->kref, nvme_free_ns);
102 spin_unlock(&dev_list_lock);
106 void nvme_requeue_req(struct request *req)
110 blk_mq_requeue_request(req);
111 spin_lock_irqsave(req->q->queue_lock, flags);
112 if (!blk_queue_stopped(req->q))
113 blk_mq_kick_requeue_list(req->q);
114 spin_unlock_irqrestore(req->q->queue_lock, flags);
116 EXPORT_SYMBOL_GPL(nvme_requeue_req);
118 struct request *nvme_alloc_request(struct request_queue *q,
119 struct nvme_command *cmd, unsigned int flags)
121 bool write = cmd->common.opcode & 1;
124 req = blk_mq_alloc_request(q, write, flags);
128 req->cmd_type = REQ_TYPE_DRV_PRIV;
129 req->cmd_flags |= REQ_FAILFAST_DRIVER;
131 req->__sector = (sector_t) -1;
132 req->bio = req->biotail = NULL;
134 req->cmd = (unsigned char *)cmd;
135 req->cmd_len = sizeof(struct nvme_command);
139 EXPORT_SYMBOL_GPL(nvme_alloc_request);
142 * Returns 0 on success. If the result is negative, it's a Linux error code;
143 * if the result is positive, it's an NVM Express status code
145 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
146 struct nvme_completion *cqe, void *buffer, unsigned bufflen,
152 req = nvme_alloc_request(q, cmd, 0);
156 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
159 if (buffer && bufflen) {
160 ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
165 blk_execute_rq(req->q, NULL, req, 0);
168 blk_mq_free_request(req);
172 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
173 void *buffer, unsigned bufflen)
175 return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0);
177 EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
179 int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
180 void __user *ubuffer, unsigned bufflen,
181 void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
182 u32 *result, unsigned timeout)
184 bool write = cmd->common.opcode & 1;
185 struct nvme_completion cqe;
186 struct nvme_ns *ns = q->queuedata;
187 struct gendisk *disk = ns ? ns->disk : NULL;
189 struct bio *bio = NULL;
193 req = nvme_alloc_request(q, cmd, 0);
197 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
200 if (ubuffer && bufflen) {
201 ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
209 bio->bi_bdev = bdget_disk(disk, 0);
215 if (meta_buffer && meta_len) {
216 struct bio_integrity_payload *bip;
218 meta = kmalloc(meta_len, GFP_KERNEL);
225 if (copy_from_user(meta, meta_buffer,
232 bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
238 bip->bip_iter.bi_size = meta_len;
239 bip->bip_iter.bi_sector = meta_seed;
241 ret = bio_integrity_add_page(bio, virt_to_page(meta),
242 meta_len, offset_in_page(meta));
243 if (ret != meta_len) {
250 blk_execute_rq(req->q, disk, req, 0);
253 *result = le32_to_cpu(cqe.result);
254 if (meta && !ret && !write) {
255 if (copy_to_user(meta_buffer, meta, meta_len))
262 if (disk && bio->bi_bdev)
264 blk_rq_unmap_user(bio);
267 blk_mq_free_request(req);
271 int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
272 void __user *ubuffer, unsigned bufflen, u32 *result,
275 return __nvme_submit_user_cmd(q, cmd, ubuffer, bufflen, NULL, 0, 0,
279 int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
281 struct nvme_command c = { };
284 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
285 c.identify.opcode = nvme_admin_identify;
286 c.identify.cns = cpu_to_le32(1);
288 *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
292 error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
293 sizeof(struct nvme_id_ctrl));
299 static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list)
301 struct nvme_command c = { };
303 c.identify.opcode = nvme_admin_identify;
304 c.identify.cns = cpu_to_le32(2);
305 c.identify.nsid = cpu_to_le32(nsid);
306 return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, 0x1000);
309 int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
310 struct nvme_id_ns **id)
312 struct nvme_command c = { };
315 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
316 c.identify.opcode = nvme_admin_identify,
317 c.identify.nsid = cpu_to_le32(nsid),
319 *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL);
323 error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
324 sizeof(struct nvme_id_ns));
330 int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
331 dma_addr_t dma_addr, u32 *result)
333 struct nvme_command c;
334 struct nvme_completion cqe;
337 memset(&c, 0, sizeof(c));
338 c.features.opcode = nvme_admin_get_features;
339 c.features.nsid = cpu_to_le32(nsid);
340 c.features.prp1 = cpu_to_le64(dma_addr);
341 c.features.fid = cpu_to_le32(fid);
343 ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &cqe, NULL, 0, 0);
345 *result = le32_to_cpu(cqe.result);
349 int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
350 dma_addr_t dma_addr, u32 *result)
352 struct nvme_command c;
353 struct nvme_completion cqe;
356 memset(&c, 0, sizeof(c));
357 c.features.opcode = nvme_admin_set_features;
358 c.features.prp1 = cpu_to_le64(dma_addr);
359 c.features.fid = cpu_to_le32(fid);
360 c.features.dword11 = cpu_to_le32(dword11);
362 ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &cqe, NULL, 0, 0);
364 *result = le32_to_cpu(cqe.result);
368 int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log)
370 struct nvme_command c = { };
373 c.common.opcode = nvme_admin_get_log_page,
374 c.common.nsid = cpu_to_le32(0xFFFFFFFF),
375 c.common.cdw10[0] = cpu_to_le32(
376 (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) |
379 *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL);
383 error = nvme_submit_sync_cmd(dev->admin_q, &c, *log,
384 sizeof(struct nvme_smart_log));
390 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
392 u32 q_count = (*count - 1) | ((*count - 1) << 16);
394 int status, nr_io_queues;
396 status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, 0,
401 nr_io_queues = min(result & 0xffff, result >> 16) + 1;
402 *count = min(*count, nr_io_queues);
405 EXPORT_SYMBOL_GPL(nvme_set_queue_count);
407 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
409 struct nvme_user_io io;
410 struct nvme_command c;
411 unsigned length, meta_len;
412 void __user *metadata;
414 if (copy_from_user(&io, uio, sizeof(io)))
422 case nvme_cmd_compare:
428 length = (io.nblocks + 1) << ns->lba_shift;
429 meta_len = (io.nblocks + 1) * ns->ms;
430 metadata = (void __user *)(uintptr_t)io.metadata;
435 } else if (meta_len) {
436 if ((io.metadata & 3) || !io.metadata)
440 memset(&c, 0, sizeof(c));
441 c.rw.opcode = io.opcode;
442 c.rw.flags = io.flags;
443 c.rw.nsid = cpu_to_le32(ns->ns_id);
444 c.rw.slba = cpu_to_le64(io.slba);
445 c.rw.length = cpu_to_le16(io.nblocks);
446 c.rw.control = cpu_to_le16(io.control);
447 c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
448 c.rw.reftag = cpu_to_le32(io.reftag);
449 c.rw.apptag = cpu_to_le16(io.apptag);
450 c.rw.appmask = cpu_to_le16(io.appmask);
452 return __nvme_submit_user_cmd(ns->queue, &c,
453 (void __user *)(uintptr_t)io.addr, length,
454 metadata, meta_len, io.slba, NULL, 0);
457 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
458 struct nvme_passthru_cmd __user *ucmd)
460 struct nvme_passthru_cmd cmd;
461 struct nvme_command c;
462 unsigned timeout = 0;
465 if (!capable(CAP_SYS_ADMIN))
467 if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
472 memset(&c, 0, sizeof(c));
473 c.common.opcode = cmd.opcode;
474 c.common.flags = cmd.flags;
475 c.common.nsid = cpu_to_le32(cmd.nsid);
476 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
477 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
478 c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
479 c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
480 c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
481 c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
482 c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
483 c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);
486 timeout = msecs_to_jiffies(cmd.timeout_ms);
488 status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
489 (void __user *)(uintptr_t)cmd.addr, cmd.data_len,
490 &cmd.result, timeout);
492 if (put_user(cmd.result, &ucmd->result))
499 static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
500 unsigned int cmd, unsigned long arg)
502 struct nvme_ns *ns = bdev->bd_disk->private_data;
506 force_successful_syscall_return();
508 case NVME_IOCTL_ADMIN_CMD:
509 return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg);
510 case NVME_IOCTL_IO_CMD:
511 return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg);
512 case NVME_IOCTL_SUBMIT_IO:
513 return nvme_submit_io(ns, (void __user *)arg);
514 #ifdef CONFIG_BLK_DEV_NVME_SCSI
515 case SG_GET_VERSION_NUM:
516 return nvme_sg_get_version_num((void __user *)arg);
518 return nvme_sg_io(ns, (void __user *)arg);
526 static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
527 unsigned int cmd, unsigned long arg)
533 return nvme_ioctl(bdev, mode, cmd, arg);
536 #define nvme_compat_ioctl NULL
539 static int nvme_open(struct block_device *bdev, fmode_t mode)
541 return nvme_get_ns_from_disk(bdev->bd_disk) ? 0 : -ENXIO;
544 static void nvme_release(struct gendisk *disk, fmode_t mode)
546 struct nvme_ns *ns = disk->private_data;
548 module_put(ns->ctrl->ops->module);
552 static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
554 /* some standard values */
556 geo->sectors = 1 << 5;
557 geo->cylinders = get_capacity(bdev->bd_disk) >> 11;
561 #ifdef CONFIG_BLK_DEV_INTEGRITY
562 static void nvme_init_integrity(struct nvme_ns *ns)
564 struct blk_integrity integrity;
566 switch (ns->pi_type) {
567 case NVME_NS_DPS_PI_TYPE3:
568 integrity.profile = &t10_pi_type3_crc;
570 case NVME_NS_DPS_PI_TYPE1:
571 case NVME_NS_DPS_PI_TYPE2:
572 integrity.profile = &t10_pi_type1_crc;
575 integrity.profile = NULL;
578 integrity.tuple_size = ns->ms;
579 blk_integrity_register(ns->disk, &integrity);
580 blk_queue_max_integrity_segments(ns->queue, 1);
583 static void nvme_init_integrity(struct nvme_ns *ns)
586 #endif /* CONFIG_BLK_DEV_INTEGRITY */
588 static void nvme_config_discard(struct nvme_ns *ns)
590 struct nvme_ctrl *ctrl = ns->ctrl;
591 u32 logical_block_size = queue_logical_block_size(ns->queue);
593 if (ctrl->quirks & NVME_QUIRK_DISCARD_ZEROES)
594 ns->queue->limits.discard_zeroes_data = 1;
596 ns->queue->limits.discard_zeroes_data = 0;
598 ns->queue->limits.discard_alignment = logical_block_size;
599 ns->queue->limits.discard_granularity = logical_block_size;
600 blk_queue_max_discard_sectors(ns->queue, 0xffffffff);
601 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue);
604 static int nvme_revalidate_disk(struct gendisk *disk)
606 struct nvme_ns *ns = disk->private_data;
607 struct nvme_id_ns *id;
612 if (test_bit(NVME_NS_DEAD, &ns->flags)) {
613 set_capacity(disk, 0);
616 if (nvme_identify_ns(ns->ctrl, ns->ns_id, &id)) {
617 dev_warn(disk_to_dev(ns->disk), "%s: Identify failure\n",
626 if (nvme_nvm_ns_supported(ns, id) && ns->type != NVME_NS_LIGHTNVM) {
627 if (nvme_nvm_register(ns->queue, disk->disk_name)) {
628 dev_warn(disk_to_dev(ns->disk),
629 "%s: LightNVM init failure\n", __func__);
633 ns->type = NVME_NS_LIGHTNVM;
636 if (ns->ctrl->vs >= NVME_VS(1, 1))
637 memcpy(ns->eui, id->eui64, sizeof(ns->eui));
638 if (ns->ctrl->vs >= NVME_VS(1, 2))
639 memcpy(ns->uuid, id->nguid, sizeof(ns->uuid));
642 lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK;
643 ns->lba_shift = id->lbaf[lbaf].ds;
644 ns->ms = le16_to_cpu(id->lbaf[lbaf].ms);
645 ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
648 * If identify namespace failed, use default 512 byte block size so
649 * block layer can use before failing read/write for 0 capacity.
651 if (ns->lba_shift == 0)
653 bs = 1 << ns->lba_shift;
654 /* XXX: PI implementation requires metadata equal t10 pi tuple size */
655 pi_type = ns->ms == sizeof(struct t10_pi_tuple) ?
656 id->dps & NVME_NS_DPS_PI_MASK : 0;
658 blk_mq_freeze_queue(disk->queue);
659 if (blk_get_integrity(disk) && (ns->pi_type != pi_type ||
661 bs != queue_logical_block_size(disk->queue) ||
662 (ns->ms && ns->ext)))
663 blk_integrity_unregister(disk);
665 ns->pi_type = pi_type;
666 blk_queue_logical_block_size(ns->queue, bs);
668 if (ns->ms && !blk_get_integrity(disk) && !ns->ext)
669 nvme_init_integrity(ns);
670 if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk))
671 set_capacity(disk, 0);
673 set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
675 if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM)
676 nvme_config_discard(ns);
677 blk_mq_unfreeze_queue(disk->queue);
683 static char nvme_pr_type(enum pr_type type)
686 case PR_WRITE_EXCLUSIVE:
688 case PR_EXCLUSIVE_ACCESS:
690 case PR_WRITE_EXCLUSIVE_REG_ONLY:
692 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
694 case PR_WRITE_EXCLUSIVE_ALL_REGS:
696 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
703 static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
704 u64 key, u64 sa_key, u8 op)
706 struct nvme_ns *ns = bdev->bd_disk->private_data;
707 struct nvme_command c;
708 u8 data[16] = { 0, };
710 put_unaligned_le64(key, &data[0]);
711 put_unaligned_le64(sa_key, &data[8]);
713 memset(&c, 0, sizeof(c));
714 c.common.opcode = op;
715 c.common.nsid = cpu_to_le32(ns->ns_id);
716 c.common.cdw10[0] = cpu_to_le32(cdw10);
718 return nvme_submit_sync_cmd(ns->queue, &c, data, 16);
721 static int nvme_pr_register(struct block_device *bdev, u64 old,
722 u64 new, unsigned flags)
726 if (flags & ~PR_FL_IGNORE_KEY)
730 cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;
731 cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */
732 return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);
735 static int nvme_pr_reserve(struct block_device *bdev, u64 key,
736 enum pr_type type, unsigned flags)
740 if (flags & ~PR_FL_IGNORE_KEY)
743 cdw10 = nvme_pr_type(type) << 8;
744 cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);
745 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);
748 static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,
749 enum pr_type type, bool abort)
751 u32 cdw10 = nvme_pr_type(type) << 8 | abort ? 2 : 1;
752 return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);
755 static int nvme_pr_clear(struct block_device *bdev, u64 key)
757 u32 cdw10 = 1 | (key ? 1 << 3 : 0);
758 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);
761 static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
763 u32 cdw10 = nvme_pr_type(type) << 8 | key ? 1 << 3 : 0;
764 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
767 static const struct pr_ops nvme_pr_ops = {
768 .pr_register = nvme_pr_register,
769 .pr_reserve = nvme_pr_reserve,
770 .pr_release = nvme_pr_release,
771 .pr_preempt = nvme_pr_preempt,
772 .pr_clear = nvme_pr_clear,
775 static const struct block_device_operations nvme_fops = {
776 .owner = THIS_MODULE,
778 .compat_ioctl = nvme_compat_ioctl,
780 .release = nvme_release,
781 .getgeo = nvme_getgeo,
782 .revalidate_disk= nvme_revalidate_disk,
783 .pr_ops = &nvme_pr_ops,
786 static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
788 unsigned long timeout =
789 ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
790 u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
793 while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
794 if ((csts & NVME_CSTS_RDY) == bit)
798 if (fatal_signal_pending(current))
800 if (time_after(jiffies, timeout)) {
801 dev_err(ctrl->device,
802 "Device not ready; aborting %s\n", enabled ?
803 "initialisation" : "reset");
812 * If the device has been passed off to us in an enabled state, just clear
813 * the enabled bit. The spec says we should set the 'shutdown notification
814 * bits', but doing so may cause the device to complete commands to the
815 * admin queue ... and we don't know what memory that might be pointing at!
817 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
821 ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
822 ctrl->ctrl_config &= ~NVME_CC_ENABLE;
824 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
827 return nvme_wait_ready(ctrl, cap, false);
829 EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
831 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
834 * Default to a 4K page size, with the intention to update this
835 * path in the future to accomodate architectures with differing
836 * kernel and IO page sizes.
838 unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12;
841 if (page_shift < dev_page_min) {
842 dev_err(ctrl->device,
843 "Minimum device page size %u too large for host (%u)\n",
844 1 << dev_page_min, 1 << page_shift);
848 ctrl->page_size = 1 << page_shift;
850 ctrl->ctrl_config = NVME_CC_CSS_NVM;
851 ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
852 ctrl->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
853 ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
854 ctrl->ctrl_config |= NVME_CC_ENABLE;
856 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
859 return nvme_wait_ready(ctrl, cap, true);
861 EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
863 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
865 unsigned long timeout = SHUTDOWN_TIMEOUT + jiffies;
869 ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
870 ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
872 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
876 while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
877 if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
881 if (fatal_signal_pending(current))
883 if (time_after(jiffies, timeout)) {
884 dev_err(ctrl->device,
885 "Device shutdown incomplete; abort shutdown\n");
892 EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
894 static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
895 struct request_queue *q)
897 if (ctrl->max_hw_sectors) {
899 (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;
901 blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
902 blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
904 if (ctrl->stripe_size)
905 blk_queue_chunk_sectors(q, ctrl->stripe_size >> 9);
906 if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
907 blk_queue_flush(q, REQ_FLUSH | REQ_FUA);
908 blk_queue_virt_boundary(q, ctrl->page_size - 1);
912 * Initialize the cached copies of the Identify data and various controller
913 * register in our nvme_ctrl structure. This should be called as soon as
914 * the admin queue is fully up and running.
916 int nvme_init_identify(struct nvme_ctrl *ctrl)
918 struct nvme_id_ctrl *id;
922 ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
924 dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
928 ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
930 dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
933 page_shift = NVME_CAP_MPSMIN(cap) + 12;
935 if (ctrl->vs >= NVME_VS(1, 1))
936 ctrl->subsystem = NVME_CAP_NSSRC(cap);
938 ret = nvme_identify_ctrl(ctrl, &id);
940 dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
944 ctrl->vid = le16_to_cpu(id->vid);
945 ctrl->oncs = le16_to_cpup(&id->oncs);
946 atomic_set(&ctrl->abort_limit, id->acl + 1);
948 ctrl->cntlid = le16_to_cpup(&id->cntlid);
949 memcpy(ctrl->serial, id->sn, sizeof(id->sn));
950 memcpy(ctrl->model, id->mn, sizeof(id->mn));
951 memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr));
953 ctrl->max_hw_sectors = 1 << (id->mdts + page_shift - 9);
955 ctrl->max_hw_sectors = UINT_MAX;
957 if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && id->vs[3]) {
958 unsigned int max_hw_sectors;
960 ctrl->stripe_size = 1 << (id->vs[3] + page_shift);
961 max_hw_sectors = ctrl->stripe_size >> (page_shift - 9);
962 if (ctrl->max_hw_sectors) {
963 ctrl->max_hw_sectors = min(max_hw_sectors,
964 ctrl->max_hw_sectors);
966 ctrl->max_hw_sectors = max_hw_sectors;
970 nvme_set_queue_limits(ctrl, ctrl->admin_q);
975 EXPORT_SYMBOL_GPL(nvme_init_identify);
977 static int nvme_dev_open(struct inode *inode, struct file *file)
979 struct nvme_ctrl *ctrl;
980 int instance = iminor(inode);
983 spin_lock(&dev_list_lock);
984 list_for_each_entry(ctrl, &nvme_ctrl_list, node) {
985 if (ctrl->instance != instance)
988 if (!ctrl->admin_q) {
992 if (!kref_get_unless_zero(&ctrl->kref))
994 file->private_data = ctrl;
998 spin_unlock(&dev_list_lock);
1003 static int nvme_dev_release(struct inode *inode, struct file *file)
1005 nvme_put_ctrl(file->private_data);
1009 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
1014 mutex_lock(&ctrl->namespaces_mutex);
1015 if (list_empty(&ctrl->namespaces)) {
1020 ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
1021 if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
1022 dev_warn(ctrl->device,
1023 "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
1028 dev_warn(ctrl->device,
1029 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
1030 kref_get(&ns->kref);
1031 mutex_unlock(&ctrl->namespaces_mutex);
1033 ret = nvme_user_cmd(ctrl, ns, argp);
1038 mutex_unlock(&ctrl->namespaces_mutex);
1042 static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
1045 struct nvme_ctrl *ctrl = file->private_data;
1046 void __user *argp = (void __user *)arg;
1049 case NVME_IOCTL_ADMIN_CMD:
1050 return nvme_user_cmd(ctrl, NULL, argp);
1051 case NVME_IOCTL_IO_CMD:
1052 return nvme_dev_user_cmd(ctrl, argp);
1053 case NVME_IOCTL_RESET:
1054 dev_warn(ctrl->device, "resetting controller\n");
1055 return ctrl->ops->reset_ctrl(ctrl);
1056 case NVME_IOCTL_SUBSYS_RESET:
1057 return nvme_reset_subsystem(ctrl);
1063 static const struct file_operations nvme_dev_fops = {
1064 .owner = THIS_MODULE,
1065 .open = nvme_dev_open,
1066 .release = nvme_dev_release,
1067 .unlocked_ioctl = nvme_dev_ioctl,
1068 .compat_ioctl = nvme_dev_ioctl,
1071 static ssize_t nvme_sysfs_reset(struct device *dev,
1072 struct device_attribute *attr, const char *buf,
1075 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
1078 ret = ctrl->ops->reset_ctrl(ctrl);
1083 static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
1085 static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
1088 struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1089 struct nvme_ctrl *ctrl = ns->ctrl;
1090 int serial_len = sizeof(ctrl->serial);
1091 int model_len = sizeof(ctrl->model);
1093 if (memchr_inv(ns->uuid, 0, sizeof(ns->uuid)))
1094 return sprintf(buf, "eui.%16phN\n", ns->uuid);
1096 if (memchr_inv(ns->eui, 0, sizeof(ns->eui)))
1097 return sprintf(buf, "eui.%8phN\n", ns->eui);
1099 while (ctrl->serial[serial_len - 1] == ' ')
1101 while (ctrl->model[model_len - 1] == ' ')
1104 return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", ctrl->vid,
1105 serial_len, ctrl->serial, model_len, ctrl->model, ns->ns_id);
1107 static DEVICE_ATTR(wwid, S_IRUGO, wwid_show, NULL);
1109 static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
1112 struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1113 return sprintf(buf, "%pU\n", ns->uuid);
1115 static DEVICE_ATTR(uuid, S_IRUGO, uuid_show, NULL);
1117 static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
1120 struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1121 return sprintf(buf, "%8phd\n", ns->eui);
1123 static DEVICE_ATTR(eui, S_IRUGO, eui_show, NULL);
1125 static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
1128 struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1129 return sprintf(buf, "%d\n", ns->ns_id);
1131 static DEVICE_ATTR(nsid, S_IRUGO, nsid_show, NULL);
1133 static struct attribute *nvme_ns_attrs[] = {
1134 &dev_attr_wwid.attr,
1135 &dev_attr_uuid.attr,
1137 &dev_attr_nsid.attr,
1141 static umode_t nvme_attrs_are_visible(struct kobject *kobj,
1142 struct attribute *a, int n)
1144 struct device *dev = container_of(kobj, struct device, kobj);
1145 struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1147 if (a == &dev_attr_uuid.attr) {
1148 if (!memchr_inv(ns->uuid, 0, sizeof(ns->uuid)))
1151 if (a == &dev_attr_eui.attr) {
1152 if (!memchr_inv(ns->eui, 0, sizeof(ns->eui)))
1158 static const struct attribute_group nvme_ns_attr_group = {
1159 .attrs = nvme_ns_attrs,
1160 .is_visible = nvme_attrs_are_visible,
1163 #define nvme_show_str_function(field) \
1164 static ssize_t field##_show(struct device *dev, \
1165 struct device_attribute *attr, char *buf) \
1167 struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
1168 return sprintf(buf, "%.*s\n", (int)sizeof(ctrl->field), ctrl->field); \
1170 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
1172 #define nvme_show_int_function(field) \
1173 static ssize_t field##_show(struct device *dev, \
1174 struct device_attribute *attr, char *buf) \
1176 struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
1177 return sprintf(buf, "%d\n", ctrl->field); \
1179 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
1181 nvme_show_str_function(model);
1182 nvme_show_str_function(serial);
1183 nvme_show_str_function(firmware_rev);
1184 nvme_show_int_function(cntlid);
1186 static struct attribute *nvme_dev_attrs[] = {
1187 &dev_attr_reset_controller.attr,
1188 &dev_attr_model.attr,
1189 &dev_attr_serial.attr,
1190 &dev_attr_firmware_rev.attr,
1191 &dev_attr_cntlid.attr,
1195 static struct attribute_group nvme_dev_attrs_group = {
1196 .attrs = nvme_dev_attrs,
1199 static const struct attribute_group *nvme_dev_attr_groups[] = {
1200 &nvme_dev_attrs_group,
1204 static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
1206 struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
1207 struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
1209 return nsa->ns_id - nsb->ns_id;
1212 static struct nvme_ns *nvme_find_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1216 lockdep_assert_held(&ctrl->namespaces_mutex);
1218 list_for_each_entry(ns, &ctrl->namespaces, list) {
1219 if (ns->ns_id == nsid)
1221 if (ns->ns_id > nsid)
1227 static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1230 struct gendisk *disk;
1231 int node = dev_to_node(ctrl->dev);
1233 lockdep_assert_held(&ctrl->namespaces_mutex);
1235 ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
1239 ns->instance = ida_simple_get(&ctrl->ns_ida, 1, 0, GFP_KERNEL);
1240 if (ns->instance < 0)
1243 ns->queue = blk_mq_init_queue(ctrl->tagset);
1244 if (IS_ERR(ns->queue))
1245 goto out_release_instance;
1246 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
1247 ns->queue->queuedata = ns;
1250 disk = alloc_disk_node(0, node);
1252 goto out_free_queue;
1254 kref_init(&ns->kref);
1257 ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */
1260 blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
1261 nvme_set_queue_limits(ctrl, ns->queue);
1263 disk->major = nvme_major;
1264 disk->first_minor = 0;
1265 disk->fops = &nvme_fops;
1266 disk->private_data = ns;
1267 disk->queue = ns->queue;
1268 disk->driverfs_dev = ctrl->device;
1269 disk->flags = GENHD_FL_EXT_DEVT;
1270 sprintf(disk->disk_name, "nvme%dn%d", ctrl->instance, ns->instance);
1272 if (nvme_revalidate_disk(ns->disk))
1275 list_add_tail(&ns->list, &ctrl->namespaces);
1276 kref_get(&ctrl->kref);
1277 if (ns->type == NVME_NS_LIGHTNVM)
1281 if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
1282 &nvme_ns_attr_group))
1283 pr_warn("%s: failed to create sysfs group for identification\n",
1284 ns->disk->disk_name);
1289 blk_cleanup_queue(ns->queue);
1290 out_release_instance:
1291 ida_simple_remove(&ctrl->ns_ida, ns->instance);
1296 static void nvme_ns_remove(struct nvme_ns *ns)
1298 if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
1301 if (ns->disk->flags & GENHD_FL_UP) {
1302 if (blk_get_integrity(ns->disk))
1303 blk_integrity_unregister(ns->disk);
1304 sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
1305 &nvme_ns_attr_group);
1306 del_gendisk(ns->disk);
1307 blk_mq_abort_requeue_list(ns->queue);
1308 blk_cleanup_queue(ns->queue);
1310 mutex_lock(&ns->ctrl->namespaces_mutex);
1311 list_del_init(&ns->list);
1312 mutex_unlock(&ns->ctrl->namespaces_mutex);
1316 static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1320 ns = nvme_find_ns(ctrl, nsid);
1322 if (revalidate_disk(ns->disk))
1325 nvme_alloc_ns(ctrl, nsid);
1328 static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn)
1332 unsigned i, j, nsid, prev = 0, num_lists = DIV_ROUND_UP(nn, 1024);
1335 ns_list = kzalloc(0x1000, GFP_KERNEL);
1339 for (i = 0; i < num_lists; i++) {
1340 ret = nvme_identify_ns_list(ctrl, prev, ns_list);
1344 for (j = 0; j < min(nn, 1024U); j++) {
1345 nsid = le32_to_cpu(ns_list[j]);
1349 nvme_validate_ns(ctrl, nsid);
1351 while (++prev < nsid) {
1352 ns = nvme_find_ns(ctrl, prev);
1364 static void __nvme_scan_namespaces(struct nvme_ctrl *ctrl, unsigned nn)
1366 struct nvme_ns *ns, *next;
1369 lockdep_assert_held(&ctrl->namespaces_mutex);
1371 for (i = 1; i <= nn; i++)
1372 nvme_validate_ns(ctrl, i);
1374 list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
1380 void nvme_scan_namespaces(struct nvme_ctrl *ctrl)
1382 struct nvme_id_ctrl *id;
1385 if (nvme_identify_ctrl(ctrl, &id))
1388 mutex_lock(&ctrl->namespaces_mutex);
1389 nn = le32_to_cpu(id->nn);
1390 if (ctrl->vs >= NVME_VS(1, 1) &&
1391 !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) {
1392 if (!nvme_scan_ns_list(ctrl, nn))
1395 __nvme_scan_namespaces(ctrl, le32_to_cpup(&id->nn));
1397 list_sort(NULL, &ctrl->namespaces, ns_cmp);
1398 mutex_unlock(&ctrl->namespaces_mutex);
1401 EXPORT_SYMBOL_GPL(nvme_scan_namespaces);
1403 void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
1405 struct nvme_ns *ns, *next;
1407 list_for_each_entry_safe(ns, next, &ctrl->namespaces, list)
1410 EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
1412 static DEFINE_IDA(nvme_instance_ida);
1414 static int nvme_set_instance(struct nvme_ctrl *ctrl)
1416 int instance, error;
1419 if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL))
1422 spin_lock(&dev_list_lock);
1423 error = ida_get_new(&nvme_instance_ida, &instance);
1424 spin_unlock(&dev_list_lock);
1425 } while (error == -EAGAIN);
1430 ctrl->instance = instance;
1434 static void nvme_release_instance(struct nvme_ctrl *ctrl)
1436 spin_lock(&dev_list_lock);
1437 ida_remove(&nvme_instance_ida, ctrl->instance);
1438 spin_unlock(&dev_list_lock);
1441 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
1443 device_destroy(nvme_class, MKDEV(nvme_char_major, ctrl->instance));
1445 spin_lock(&dev_list_lock);
1446 list_del(&ctrl->node);
1447 spin_unlock(&dev_list_lock);
1449 EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
1451 static void nvme_free_ctrl(struct kref *kref)
1453 struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref);
1455 put_device(ctrl->device);
1456 nvme_release_instance(ctrl);
1457 ida_destroy(&ctrl->ns_ida);
1459 ctrl->ops->free_ctrl(ctrl);
1462 void nvme_put_ctrl(struct nvme_ctrl *ctrl)
1464 kref_put(&ctrl->kref, nvme_free_ctrl);
1466 EXPORT_SYMBOL_GPL(nvme_put_ctrl);
1469 * Initialize a NVMe controller structures. This needs to be called during
1470 * earliest initialization so that we have the initialized structured around
1473 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
1474 const struct nvme_ctrl_ops *ops, unsigned long quirks)
1478 INIT_LIST_HEAD(&ctrl->namespaces);
1479 mutex_init(&ctrl->namespaces_mutex);
1480 kref_init(&ctrl->kref);
1483 ctrl->quirks = quirks;
1485 ret = nvme_set_instance(ctrl);
1489 ctrl->device = device_create_with_groups(nvme_class, ctrl->dev,
1490 MKDEV(nvme_char_major, ctrl->instance),
1491 ctrl, nvme_dev_attr_groups,
1492 "nvme%d", ctrl->instance);
1493 if (IS_ERR(ctrl->device)) {
1494 ret = PTR_ERR(ctrl->device);
1495 goto out_release_instance;
1497 get_device(ctrl->device);
1498 ida_init(&ctrl->ns_ida);
1500 spin_lock(&dev_list_lock);
1501 list_add_tail(&ctrl->node, &nvme_ctrl_list);
1502 spin_unlock(&dev_list_lock);
1505 out_release_instance:
1506 nvme_release_instance(ctrl);
1510 EXPORT_SYMBOL_GPL(nvme_init_ctrl);
1513 * nvme_kill_queues(): Ends all namespace queues
1514 * @ctrl: the dead controller that needs to end
1516 * Call this function when the driver determines it is unable to get the
1517 * controller in a state capable of servicing IO.
1519 void nvme_kill_queues(struct nvme_ctrl *ctrl)
1523 mutex_lock(&ctrl->namespaces_mutex);
1524 list_for_each_entry(ns, &ctrl->namespaces, list) {
1525 if (!kref_get_unless_zero(&ns->kref))
1529 * Revalidating a dead namespace sets capacity to 0. This will
1530 * end buffered writers dirtying pages that can't be synced.
1532 if (!test_and_set_bit(NVME_NS_DEAD, &ns->flags))
1533 revalidate_disk(ns->disk);
1535 blk_set_queue_dying(ns->queue);
1536 blk_mq_abort_requeue_list(ns->queue);
1537 blk_mq_start_stopped_hw_queues(ns->queue, true);
1541 mutex_unlock(&ctrl->namespaces_mutex);
1543 EXPORT_SYMBOL_GPL(nvme_kill_queues);
1545 void nvme_stop_queues(struct nvme_ctrl *ctrl)
1549 mutex_lock(&ctrl->namespaces_mutex);
1550 list_for_each_entry(ns, &ctrl->namespaces, list) {
1551 spin_lock_irq(ns->queue->queue_lock);
1552 queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue);
1553 spin_unlock_irq(ns->queue->queue_lock);
1555 blk_mq_cancel_requeue_work(ns->queue);
1556 blk_mq_stop_hw_queues(ns->queue);
1558 mutex_unlock(&ctrl->namespaces_mutex);
1560 EXPORT_SYMBOL_GPL(nvme_stop_queues);
1562 void nvme_start_queues(struct nvme_ctrl *ctrl)
1566 mutex_lock(&ctrl->namespaces_mutex);
1567 list_for_each_entry(ns, &ctrl->namespaces, list) {
1568 queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue);
1569 blk_mq_start_stopped_hw_queues(ns->queue, true);
1570 blk_mq_kick_requeue_list(ns->queue);
1572 mutex_unlock(&ctrl->namespaces_mutex);
1574 EXPORT_SYMBOL_GPL(nvme_start_queues);
1576 int __init nvme_core_init(void)
1580 result = register_blkdev(nvme_major, "nvme");
1583 else if (result > 0)
1584 nvme_major = result;
1586 result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme",
1589 goto unregister_blkdev;
1590 else if (result > 0)
1591 nvme_char_major = result;
1593 nvme_class = class_create(THIS_MODULE, "nvme");
1594 if (IS_ERR(nvme_class)) {
1595 result = PTR_ERR(nvme_class);
1596 goto unregister_chrdev;
1602 __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
1604 unregister_blkdev(nvme_major, "nvme");
1608 void nvme_core_exit(void)
1610 unregister_blkdev(nvme_major, "nvme");
1611 class_destroy(nvme_class);
1612 __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
1615 MODULE_LICENSE("GPL");
1616 MODULE_VERSION("1.0");
1617 module_init(nvme_core_init);
1618 module_exit(nvme_core_exit);