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);
141 static inline void nvme_setup_flush(struct nvme_ns *ns,
142 struct nvme_command *cmnd)
144 memset(cmnd, 0, sizeof(*cmnd));
145 cmnd->common.opcode = nvme_cmd_flush;
146 cmnd->common.nsid = cpu_to_le32(ns->ns_id);
149 static inline int nvme_setup_discard(struct nvme_ns *ns, struct request *req,
150 struct nvme_command *cmnd)
152 struct nvme_dsm_range *range;
155 unsigned int nr_bytes = blk_rq_bytes(req);
157 range = kmalloc(sizeof(*range), GFP_ATOMIC);
159 return BLK_MQ_RQ_QUEUE_BUSY;
161 range->cattr = cpu_to_le32(0);
162 range->nlb = cpu_to_le32(nr_bytes >> ns->lba_shift);
163 range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
165 memset(cmnd, 0, sizeof(*cmnd));
166 cmnd->dsm.opcode = nvme_cmd_dsm;
167 cmnd->dsm.nsid = cpu_to_le32(ns->ns_id);
169 cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
171 req->completion_data = range;
172 page = virt_to_page(range);
173 offset = offset_in_page(range);
174 blk_add_request_payload(req, page, offset, sizeof(*range));
177 * we set __data_len back to the size of the area to be discarded
178 * on disk. This allows us to report completion on the full amount
179 * of blocks described by the request.
181 req->__data_len = nr_bytes;
186 static inline void nvme_setup_rw(struct nvme_ns *ns, struct request *req,
187 struct nvme_command *cmnd)
192 if (req->cmd_flags & REQ_FUA)
193 control |= NVME_RW_FUA;
194 if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
195 control |= NVME_RW_LR;
197 if (req->cmd_flags & REQ_RAHEAD)
198 dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
200 memset(cmnd, 0, sizeof(*cmnd));
201 cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
202 cmnd->rw.command_id = req->tag;
203 cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
204 cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
205 cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
208 switch (ns->pi_type) {
209 case NVME_NS_DPS_PI_TYPE3:
210 control |= NVME_RW_PRINFO_PRCHK_GUARD;
212 case NVME_NS_DPS_PI_TYPE1:
213 case NVME_NS_DPS_PI_TYPE2:
214 control |= NVME_RW_PRINFO_PRCHK_GUARD |
215 NVME_RW_PRINFO_PRCHK_REF;
216 cmnd->rw.reftag = cpu_to_le32(
217 nvme_block_nr(ns, blk_rq_pos(req)));
220 if (!blk_integrity_rq(req))
221 control |= NVME_RW_PRINFO_PRACT;
224 cmnd->rw.control = cpu_to_le16(control);
225 cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
228 int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
229 struct nvme_command *cmd)
233 if (req->cmd_type == REQ_TYPE_DRV_PRIV)
234 memcpy(cmd, req->cmd, sizeof(*cmd));
235 else if (req->cmd_flags & REQ_FLUSH)
236 nvme_setup_flush(ns, cmd);
237 else if (req->cmd_flags & REQ_DISCARD)
238 ret = nvme_setup_discard(ns, req, cmd);
240 nvme_setup_rw(ns, req, cmd);
244 EXPORT_SYMBOL_GPL(nvme_setup_cmd);
247 * Returns 0 on success. If the result is negative, it's a Linux error code;
248 * if the result is positive, it's an NVM Express status code
250 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
251 struct nvme_completion *cqe, void *buffer, unsigned bufflen,
257 req = nvme_alloc_request(q, cmd, 0);
261 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
264 if (buffer && bufflen) {
265 ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
270 blk_execute_rq(req->q, NULL, req, 0);
273 blk_mq_free_request(req);
277 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
278 void *buffer, unsigned bufflen)
280 return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0);
282 EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
284 int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
285 void __user *ubuffer, unsigned bufflen,
286 void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
287 u32 *result, unsigned timeout)
289 bool write = cmd->common.opcode & 1;
290 struct nvme_completion cqe;
291 struct nvme_ns *ns = q->queuedata;
292 struct gendisk *disk = ns ? ns->disk : NULL;
294 struct bio *bio = NULL;
298 req = nvme_alloc_request(q, cmd, 0);
302 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
305 if (ubuffer && bufflen) {
306 ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
314 bio->bi_bdev = bdget_disk(disk, 0);
320 if (meta_buffer && meta_len) {
321 struct bio_integrity_payload *bip;
323 meta = kmalloc(meta_len, GFP_KERNEL);
330 if (copy_from_user(meta, meta_buffer,
337 bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
343 bip->bip_iter.bi_size = meta_len;
344 bip->bip_iter.bi_sector = meta_seed;
346 ret = bio_integrity_add_page(bio, virt_to_page(meta),
347 meta_len, offset_in_page(meta));
348 if (ret != meta_len) {
355 blk_execute_rq(req->q, disk, req, 0);
358 *result = le32_to_cpu(cqe.result);
359 if (meta && !ret && !write) {
360 if (copy_to_user(meta_buffer, meta, meta_len))
367 if (disk && bio->bi_bdev)
369 blk_rq_unmap_user(bio);
372 blk_mq_free_request(req);
376 int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
377 void __user *ubuffer, unsigned bufflen, u32 *result,
380 return __nvme_submit_user_cmd(q, cmd, ubuffer, bufflen, NULL, 0, 0,
384 int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
386 struct nvme_command c = { };
389 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
390 c.identify.opcode = nvme_admin_identify;
391 c.identify.cns = cpu_to_le32(1);
393 *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
397 error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
398 sizeof(struct nvme_id_ctrl));
404 static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list)
406 struct nvme_command c = { };
408 c.identify.opcode = nvme_admin_identify;
409 c.identify.cns = cpu_to_le32(2);
410 c.identify.nsid = cpu_to_le32(nsid);
411 return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, 0x1000);
414 int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
415 struct nvme_id_ns **id)
417 struct nvme_command c = { };
420 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
421 c.identify.opcode = nvme_admin_identify,
422 c.identify.nsid = cpu_to_le32(nsid),
424 *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL);
428 error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
429 sizeof(struct nvme_id_ns));
435 int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
436 dma_addr_t dma_addr, u32 *result)
438 struct nvme_command c;
439 struct nvme_completion cqe;
442 memset(&c, 0, sizeof(c));
443 c.features.opcode = nvme_admin_get_features;
444 c.features.nsid = cpu_to_le32(nsid);
445 c.features.prp1 = cpu_to_le64(dma_addr);
446 c.features.fid = cpu_to_le32(fid);
448 ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &cqe, NULL, 0, 0);
450 *result = le32_to_cpu(cqe.result);
454 int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
455 dma_addr_t dma_addr, u32 *result)
457 struct nvme_command c;
458 struct nvme_completion cqe;
461 memset(&c, 0, sizeof(c));
462 c.features.opcode = nvme_admin_set_features;
463 c.features.prp1 = cpu_to_le64(dma_addr);
464 c.features.fid = cpu_to_le32(fid);
465 c.features.dword11 = cpu_to_le32(dword11);
467 ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &cqe, NULL, 0, 0);
469 *result = le32_to_cpu(cqe.result);
473 int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log)
475 struct nvme_command c = { };
478 c.common.opcode = nvme_admin_get_log_page,
479 c.common.nsid = cpu_to_le32(0xFFFFFFFF),
480 c.common.cdw10[0] = cpu_to_le32(
481 (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) |
484 *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL);
488 error = nvme_submit_sync_cmd(dev->admin_q, &c, *log,
489 sizeof(struct nvme_smart_log));
495 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
497 u32 q_count = (*count - 1) | ((*count - 1) << 16);
499 int status, nr_io_queues;
501 status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, 0,
506 nr_io_queues = min(result & 0xffff, result >> 16) + 1;
507 *count = min(*count, nr_io_queues);
510 EXPORT_SYMBOL_GPL(nvme_set_queue_count);
512 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
514 struct nvme_user_io io;
515 struct nvme_command c;
516 unsigned length, meta_len;
517 void __user *metadata;
519 if (copy_from_user(&io, uio, sizeof(io)))
527 case nvme_cmd_compare:
533 length = (io.nblocks + 1) << ns->lba_shift;
534 meta_len = (io.nblocks + 1) * ns->ms;
535 metadata = (void __user *)(uintptr_t)io.metadata;
540 } else if (meta_len) {
541 if ((io.metadata & 3) || !io.metadata)
545 memset(&c, 0, sizeof(c));
546 c.rw.opcode = io.opcode;
547 c.rw.flags = io.flags;
548 c.rw.nsid = cpu_to_le32(ns->ns_id);
549 c.rw.slba = cpu_to_le64(io.slba);
550 c.rw.length = cpu_to_le16(io.nblocks);
551 c.rw.control = cpu_to_le16(io.control);
552 c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
553 c.rw.reftag = cpu_to_le32(io.reftag);
554 c.rw.apptag = cpu_to_le16(io.apptag);
555 c.rw.appmask = cpu_to_le16(io.appmask);
557 return __nvme_submit_user_cmd(ns->queue, &c,
558 (void __user *)(uintptr_t)io.addr, length,
559 metadata, meta_len, io.slba, NULL, 0);
562 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
563 struct nvme_passthru_cmd __user *ucmd)
565 struct nvme_passthru_cmd cmd;
566 struct nvme_command c;
567 unsigned timeout = 0;
570 if (!capable(CAP_SYS_ADMIN))
572 if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
577 memset(&c, 0, sizeof(c));
578 c.common.opcode = cmd.opcode;
579 c.common.flags = cmd.flags;
580 c.common.nsid = cpu_to_le32(cmd.nsid);
581 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
582 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
583 c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
584 c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
585 c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
586 c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
587 c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
588 c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);
591 timeout = msecs_to_jiffies(cmd.timeout_ms);
593 status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
594 (void __user *)(uintptr_t)cmd.addr, cmd.data_len,
595 &cmd.result, timeout);
597 if (put_user(cmd.result, &ucmd->result))
604 static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
605 unsigned int cmd, unsigned long arg)
607 struct nvme_ns *ns = bdev->bd_disk->private_data;
611 force_successful_syscall_return();
613 case NVME_IOCTL_ADMIN_CMD:
614 return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg);
615 case NVME_IOCTL_IO_CMD:
616 return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg);
617 case NVME_IOCTL_SUBMIT_IO:
618 return nvme_submit_io(ns, (void __user *)arg);
619 #ifdef CONFIG_BLK_DEV_NVME_SCSI
620 case SG_GET_VERSION_NUM:
621 return nvme_sg_get_version_num((void __user *)arg);
623 return nvme_sg_io(ns, (void __user *)arg);
631 static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
632 unsigned int cmd, unsigned long arg)
638 return nvme_ioctl(bdev, mode, cmd, arg);
641 #define nvme_compat_ioctl NULL
644 static int nvme_open(struct block_device *bdev, fmode_t mode)
646 return nvme_get_ns_from_disk(bdev->bd_disk) ? 0 : -ENXIO;
649 static void nvme_release(struct gendisk *disk, fmode_t mode)
651 struct nvme_ns *ns = disk->private_data;
653 module_put(ns->ctrl->ops->module);
657 static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
659 /* some standard values */
661 geo->sectors = 1 << 5;
662 geo->cylinders = get_capacity(bdev->bd_disk) >> 11;
666 #ifdef CONFIG_BLK_DEV_INTEGRITY
667 static void nvme_init_integrity(struct nvme_ns *ns)
669 struct blk_integrity integrity;
671 switch (ns->pi_type) {
672 case NVME_NS_DPS_PI_TYPE3:
673 integrity.profile = &t10_pi_type3_crc;
675 case NVME_NS_DPS_PI_TYPE1:
676 case NVME_NS_DPS_PI_TYPE2:
677 integrity.profile = &t10_pi_type1_crc;
680 integrity.profile = NULL;
683 integrity.tuple_size = ns->ms;
684 blk_integrity_register(ns->disk, &integrity);
685 blk_queue_max_integrity_segments(ns->queue, 1);
688 static void nvme_init_integrity(struct nvme_ns *ns)
691 #endif /* CONFIG_BLK_DEV_INTEGRITY */
693 static void nvme_config_discard(struct nvme_ns *ns)
695 struct nvme_ctrl *ctrl = ns->ctrl;
696 u32 logical_block_size = queue_logical_block_size(ns->queue);
698 if (ctrl->quirks & NVME_QUIRK_DISCARD_ZEROES)
699 ns->queue->limits.discard_zeroes_data = 1;
701 ns->queue->limits.discard_zeroes_data = 0;
703 ns->queue->limits.discard_alignment = logical_block_size;
704 ns->queue->limits.discard_granularity = logical_block_size;
705 blk_queue_max_discard_sectors(ns->queue, 0xffffffff);
706 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue);
709 static int nvme_revalidate_disk(struct gendisk *disk)
711 struct nvme_ns *ns = disk->private_data;
712 struct nvme_id_ns *id;
717 if (test_bit(NVME_NS_DEAD, &ns->flags)) {
718 set_capacity(disk, 0);
721 if (nvme_identify_ns(ns->ctrl, ns->ns_id, &id)) {
722 dev_warn(disk_to_dev(ns->disk), "%s: Identify failure\n",
731 if (nvme_nvm_ns_supported(ns, id) && ns->type != NVME_NS_LIGHTNVM) {
732 if (nvme_nvm_register(ns->queue, disk->disk_name)) {
733 dev_warn(disk_to_dev(ns->disk),
734 "%s: LightNVM init failure\n", __func__);
738 ns->type = NVME_NS_LIGHTNVM;
741 if (ns->ctrl->vs >= NVME_VS(1, 1))
742 memcpy(ns->eui, id->eui64, sizeof(ns->eui));
743 if (ns->ctrl->vs >= NVME_VS(1, 2))
744 memcpy(ns->uuid, id->nguid, sizeof(ns->uuid));
747 lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK;
748 ns->lba_shift = id->lbaf[lbaf].ds;
749 ns->ms = le16_to_cpu(id->lbaf[lbaf].ms);
750 ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
753 * If identify namespace failed, use default 512 byte block size so
754 * block layer can use before failing read/write for 0 capacity.
756 if (ns->lba_shift == 0)
758 bs = 1 << ns->lba_shift;
759 /* XXX: PI implementation requires metadata equal t10 pi tuple size */
760 pi_type = ns->ms == sizeof(struct t10_pi_tuple) ?
761 id->dps & NVME_NS_DPS_PI_MASK : 0;
763 blk_mq_freeze_queue(disk->queue);
764 if (blk_get_integrity(disk) && (ns->pi_type != pi_type ||
766 bs != queue_logical_block_size(disk->queue) ||
767 (ns->ms && ns->ext)))
768 blk_integrity_unregister(disk);
770 ns->pi_type = pi_type;
771 blk_queue_logical_block_size(ns->queue, bs);
773 if (ns->ms && !blk_get_integrity(disk) && !ns->ext)
774 nvme_init_integrity(ns);
775 if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk))
776 set_capacity(disk, 0);
778 set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
780 if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM)
781 nvme_config_discard(ns);
782 blk_mq_unfreeze_queue(disk->queue);
788 static char nvme_pr_type(enum pr_type type)
791 case PR_WRITE_EXCLUSIVE:
793 case PR_EXCLUSIVE_ACCESS:
795 case PR_WRITE_EXCLUSIVE_REG_ONLY:
797 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
799 case PR_WRITE_EXCLUSIVE_ALL_REGS:
801 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
808 static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
809 u64 key, u64 sa_key, u8 op)
811 struct nvme_ns *ns = bdev->bd_disk->private_data;
812 struct nvme_command c;
813 u8 data[16] = { 0, };
815 put_unaligned_le64(key, &data[0]);
816 put_unaligned_le64(sa_key, &data[8]);
818 memset(&c, 0, sizeof(c));
819 c.common.opcode = op;
820 c.common.nsid = cpu_to_le32(ns->ns_id);
821 c.common.cdw10[0] = cpu_to_le32(cdw10);
823 return nvme_submit_sync_cmd(ns->queue, &c, data, 16);
826 static int nvme_pr_register(struct block_device *bdev, u64 old,
827 u64 new, unsigned flags)
831 if (flags & ~PR_FL_IGNORE_KEY)
835 cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;
836 cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */
837 return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);
840 static int nvme_pr_reserve(struct block_device *bdev, u64 key,
841 enum pr_type type, unsigned flags)
845 if (flags & ~PR_FL_IGNORE_KEY)
848 cdw10 = nvme_pr_type(type) << 8;
849 cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);
850 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);
853 static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,
854 enum pr_type type, bool abort)
856 u32 cdw10 = nvme_pr_type(type) << 8 | abort ? 2 : 1;
857 return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);
860 static int nvme_pr_clear(struct block_device *bdev, u64 key)
862 u32 cdw10 = 1 | (key ? 1 << 3 : 0);
863 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);
866 static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
868 u32 cdw10 = nvme_pr_type(type) << 8 | key ? 1 << 3 : 0;
869 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
872 static const struct pr_ops nvme_pr_ops = {
873 .pr_register = nvme_pr_register,
874 .pr_reserve = nvme_pr_reserve,
875 .pr_release = nvme_pr_release,
876 .pr_preempt = nvme_pr_preempt,
877 .pr_clear = nvme_pr_clear,
880 static const struct block_device_operations nvme_fops = {
881 .owner = THIS_MODULE,
883 .compat_ioctl = nvme_compat_ioctl,
885 .release = nvme_release,
886 .getgeo = nvme_getgeo,
887 .revalidate_disk= nvme_revalidate_disk,
888 .pr_ops = &nvme_pr_ops,
891 static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
893 unsigned long timeout =
894 ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
895 u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
898 while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
899 if ((csts & NVME_CSTS_RDY) == bit)
903 if (fatal_signal_pending(current))
905 if (time_after(jiffies, timeout)) {
906 dev_err(ctrl->device,
907 "Device not ready; aborting %s\n", enabled ?
908 "initialisation" : "reset");
917 * If the device has been passed off to us in an enabled state, just clear
918 * the enabled bit. The spec says we should set the 'shutdown notification
919 * bits', but doing so may cause the device to complete commands to the
920 * admin queue ... and we don't know what memory that might be pointing at!
922 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
926 ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
927 ctrl->ctrl_config &= ~NVME_CC_ENABLE;
929 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
932 return nvme_wait_ready(ctrl, cap, false);
934 EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
936 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
939 * Default to a 4K page size, with the intention to update this
940 * path in the future to accomodate architectures with differing
941 * kernel and IO page sizes.
943 unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12;
946 if (page_shift < dev_page_min) {
947 dev_err(ctrl->device,
948 "Minimum device page size %u too large for host (%u)\n",
949 1 << dev_page_min, 1 << page_shift);
953 ctrl->page_size = 1 << page_shift;
955 ctrl->ctrl_config = NVME_CC_CSS_NVM;
956 ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
957 ctrl->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
958 ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
959 ctrl->ctrl_config |= NVME_CC_ENABLE;
961 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
964 return nvme_wait_ready(ctrl, cap, true);
966 EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
968 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
970 unsigned long timeout = SHUTDOWN_TIMEOUT + jiffies;
974 ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
975 ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
977 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
981 while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
982 if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
986 if (fatal_signal_pending(current))
988 if (time_after(jiffies, timeout)) {
989 dev_err(ctrl->device,
990 "Device shutdown incomplete; abort shutdown\n");
997 EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
999 static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
1000 struct request_queue *q)
1004 if (ctrl->max_hw_sectors) {
1006 (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;
1008 blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
1009 blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
1011 if (ctrl->stripe_size)
1012 blk_queue_chunk_sectors(q, ctrl->stripe_size >> 9);
1013 blk_queue_virt_boundary(q, ctrl->page_size - 1);
1014 if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
1016 blk_queue_write_cache(q, vwc, vwc);
1020 * Initialize the cached copies of the Identify data and various controller
1021 * register in our nvme_ctrl structure. This should be called as soon as
1022 * the admin queue is fully up and running.
1024 int nvme_init_identify(struct nvme_ctrl *ctrl)
1026 struct nvme_id_ctrl *id;
1028 int ret, page_shift;
1030 ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
1032 dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
1036 ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
1038 dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
1041 page_shift = NVME_CAP_MPSMIN(cap) + 12;
1043 if (ctrl->vs >= NVME_VS(1, 1))
1044 ctrl->subsystem = NVME_CAP_NSSRC(cap);
1046 ret = nvme_identify_ctrl(ctrl, &id);
1048 dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
1052 ctrl->vid = le16_to_cpu(id->vid);
1053 ctrl->oncs = le16_to_cpup(&id->oncs);
1054 atomic_set(&ctrl->abort_limit, id->acl + 1);
1055 ctrl->vwc = id->vwc;
1056 ctrl->cntlid = le16_to_cpup(&id->cntlid);
1057 memcpy(ctrl->serial, id->sn, sizeof(id->sn));
1058 memcpy(ctrl->model, id->mn, sizeof(id->mn));
1059 memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr));
1061 ctrl->max_hw_sectors = 1 << (id->mdts + page_shift - 9);
1063 ctrl->max_hw_sectors = UINT_MAX;
1065 if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && id->vs[3]) {
1066 unsigned int max_hw_sectors;
1068 ctrl->stripe_size = 1 << (id->vs[3] + page_shift);
1069 max_hw_sectors = ctrl->stripe_size >> (page_shift - 9);
1070 if (ctrl->max_hw_sectors) {
1071 ctrl->max_hw_sectors = min(max_hw_sectors,
1072 ctrl->max_hw_sectors);
1074 ctrl->max_hw_sectors = max_hw_sectors;
1078 nvme_set_queue_limits(ctrl, ctrl->admin_q);
1083 EXPORT_SYMBOL_GPL(nvme_init_identify);
1085 static int nvme_dev_open(struct inode *inode, struct file *file)
1087 struct nvme_ctrl *ctrl;
1088 int instance = iminor(inode);
1091 spin_lock(&dev_list_lock);
1092 list_for_each_entry(ctrl, &nvme_ctrl_list, node) {
1093 if (ctrl->instance != instance)
1096 if (!ctrl->admin_q) {
1100 if (!kref_get_unless_zero(&ctrl->kref))
1102 file->private_data = ctrl;
1106 spin_unlock(&dev_list_lock);
1111 static int nvme_dev_release(struct inode *inode, struct file *file)
1113 nvme_put_ctrl(file->private_data);
1117 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
1122 mutex_lock(&ctrl->namespaces_mutex);
1123 if (list_empty(&ctrl->namespaces)) {
1128 ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
1129 if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
1130 dev_warn(ctrl->device,
1131 "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
1136 dev_warn(ctrl->device,
1137 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
1138 kref_get(&ns->kref);
1139 mutex_unlock(&ctrl->namespaces_mutex);
1141 ret = nvme_user_cmd(ctrl, ns, argp);
1146 mutex_unlock(&ctrl->namespaces_mutex);
1150 static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
1153 struct nvme_ctrl *ctrl = file->private_data;
1154 void __user *argp = (void __user *)arg;
1157 case NVME_IOCTL_ADMIN_CMD:
1158 return nvme_user_cmd(ctrl, NULL, argp);
1159 case NVME_IOCTL_IO_CMD:
1160 return nvme_dev_user_cmd(ctrl, argp);
1161 case NVME_IOCTL_RESET:
1162 dev_warn(ctrl->device, "resetting controller\n");
1163 return ctrl->ops->reset_ctrl(ctrl);
1164 case NVME_IOCTL_SUBSYS_RESET:
1165 return nvme_reset_subsystem(ctrl);
1171 static const struct file_operations nvme_dev_fops = {
1172 .owner = THIS_MODULE,
1173 .open = nvme_dev_open,
1174 .release = nvme_dev_release,
1175 .unlocked_ioctl = nvme_dev_ioctl,
1176 .compat_ioctl = nvme_dev_ioctl,
1179 static ssize_t nvme_sysfs_reset(struct device *dev,
1180 struct device_attribute *attr, const char *buf,
1183 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
1186 ret = ctrl->ops->reset_ctrl(ctrl);
1191 static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
1193 static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
1196 struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1197 struct nvme_ctrl *ctrl = ns->ctrl;
1198 int serial_len = sizeof(ctrl->serial);
1199 int model_len = sizeof(ctrl->model);
1201 if (memchr_inv(ns->uuid, 0, sizeof(ns->uuid)))
1202 return sprintf(buf, "eui.%16phN\n", ns->uuid);
1204 if (memchr_inv(ns->eui, 0, sizeof(ns->eui)))
1205 return sprintf(buf, "eui.%8phN\n", ns->eui);
1207 while (ctrl->serial[serial_len - 1] == ' ')
1209 while (ctrl->model[model_len - 1] == ' ')
1212 return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", ctrl->vid,
1213 serial_len, ctrl->serial, model_len, ctrl->model, ns->ns_id);
1215 static DEVICE_ATTR(wwid, S_IRUGO, wwid_show, NULL);
1217 static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
1220 struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1221 return sprintf(buf, "%pU\n", ns->uuid);
1223 static DEVICE_ATTR(uuid, S_IRUGO, uuid_show, NULL);
1225 static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
1228 struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1229 return sprintf(buf, "%8phd\n", ns->eui);
1231 static DEVICE_ATTR(eui, S_IRUGO, eui_show, NULL);
1233 static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
1236 struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1237 return sprintf(buf, "%d\n", ns->ns_id);
1239 static DEVICE_ATTR(nsid, S_IRUGO, nsid_show, NULL);
1241 static struct attribute *nvme_ns_attrs[] = {
1242 &dev_attr_wwid.attr,
1243 &dev_attr_uuid.attr,
1245 &dev_attr_nsid.attr,
1249 static umode_t nvme_attrs_are_visible(struct kobject *kobj,
1250 struct attribute *a, int n)
1252 struct device *dev = container_of(kobj, struct device, kobj);
1253 struct nvme_ns *ns = dev_to_disk(dev)->private_data;
1255 if (a == &dev_attr_uuid.attr) {
1256 if (!memchr_inv(ns->uuid, 0, sizeof(ns->uuid)))
1259 if (a == &dev_attr_eui.attr) {
1260 if (!memchr_inv(ns->eui, 0, sizeof(ns->eui)))
1266 static const struct attribute_group nvme_ns_attr_group = {
1267 .attrs = nvme_ns_attrs,
1268 .is_visible = nvme_attrs_are_visible,
1271 #define nvme_show_str_function(field) \
1272 static ssize_t field##_show(struct device *dev, \
1273 struct device_attribute *attr, char *buf) \
1275 struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
1276 return sprintf(buf, "%.*s\n", (int)sizeof(ctrl->field), ctrl->field); \
1278 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
1280 #define nvme_show_int_function(field) \
1281 static ssize_t field##_show(struct device *dev, \
1282 struct device_attribute *attr, char *buf) \
1284 struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
1285 return sprintf(buf, "%d\n", ctrl->field); \
1287 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
1289 nvme_show_str_function(model);
1290 nvme_show_str_function(serial);
1291 nvme_show_str_function(firmware_rev);
1292 nvme_show_int_function(cntlid);
1294 static struct attribute *nvme_dev_attrs[] = {
1295 &dev_attr_reset_controller.attr,
1296 &dev_attr_model.attr,
1297 &dev_attr_serial.attr,
1298 &dev_attr_firmware_rev.attr,
1299 &dev_attr_cntlid.attr,
1303 static struct attribute_group nvme_dev_attrs_group = {
1304 .attrs = nvme_dev_attrs,
1307 static const struct attribute_group *nvme_dev_attr_groups[] = {
1308 &nvme_dev_attrs_group,
1312 static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
1314 struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
1315 struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
1317 return nsa->ns_id - nsb->ns_id;
1320 static struct nvme_ns *nvme_find_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1324 lockdep_assert_held(&ctrl->namespaces_mutex);
1326 list_for_each_entry(ns, &ctrl->namespaces, list) {
1327 if (ns->ns_id == nsid)
1329 if (ns->ns_id > nsid)
1335 static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1338 struct gendisk *disk;
1339 int node = dev_to_node(ctrl->dev);
1341 lockdep_assert_held(&ctrl->namespaces_mutex);
1343 ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
1347 ns->instance = ida_simple_get(&ctrl->ns_ida, 1, 0, GFP_KERNEL);
1348 if (ns->instance < 0)
1351 ns->queue = blk_mq_init_queue(ctrl->tagset);
1352 if (IS_ERR(ns->queue))
1353 goto out_release_instance;
1354 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
1355 ns->queue->queuedata = ns;
1358 disk = alloc_disk_node(0, node);
1360 goto out_free_queue;
1362 kref_init(&ns->kref);
1365 ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */
1368 blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
1369 nvme_set_queue_limits(ctrl, ns->queue);
1371 disk->major = nvme_major;
1372 disk->first_minor = 0;
1373 disk->fops = &nvme_fops;
1374 disk->private_data = ns;
1375 disk->queue = ns->queue;
1376 disk->driverfs_dev = ctrl->device;
1377 disk->flags = GENHD_FL_EXT_DEVT;
1378 sprintf(disk->disk_name, "nvme%dn%d", ctrl->instance, ns->instance);
1380 if (nvme_revalidate_disk(ns->disk))
1383 list_add_tail(&ns->list, &ctrl->namespaces);
1384 kref_get(&ctrl->kref);
1385 if (ns->type == NVME_NS_LIGHTNVM)
1389 if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
1390 &nvme_ns_attr_group))
1391 pr_warn("%s: failed to create sysfs group for identification\n",
1392 ns->disk->disk_name);
1397 blk_cleanup_queue(ns->queue);
1398 out_release_instance:
1399 ida_simple_remove(&ctrl->ns_ida, ns->instance);
1404 static void nvme_ns_remove(struct nvme_ns *ns)
1406 if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
1409 if (ns->disk->flags & GENHD_FL_UP) {
1410 if (blk_get_integrity(ns->disk))
1411 blk_integrity_unregister(ns->disk);
1412 sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
1413 &nvme_ns_attr_group);
1414 del_gendisk(ns->disk);
1415 blk_mq_abort_requeue_list(ns->queue);
1416 blk_cleanup_queue(ns->queue);
1418 mutex_lock(&ns->ctrl->namespaces_mutex);
1419 list_del_init(&ns->list);
1420 mutex_unlock(&ns->ctrl->namespaces_mutex);
1424 static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
1428 ns = nvme_find_ns(ctrl, nsid);
1430 if (revalidate_disk(ns->disk))
1433 nvme_alloc_ns(ctrl, nsid);
1436 static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn)
1440 unsigned i, j, nsid, prev = 0, num_lists = DIV_ROUND_UP(nn, 1024);
1443 ns_list = kzalloc(0x1000, GFP_KERNEL);
1447 for (i = 0; i < num_lists; i++) {
1448 ret = nvme_identify_ns_list(ctrl, prev, ns_list);
1452 for (j = 0; j < min(nn, 1024U); j++) {
1453 nsid = le32_to_cpu(ns_list[j]);
1457 nvme_validate_ns(ctrl, nsid);
1459 while (++prev < nsid) {
1460 ns = nvme_find_ns(ctrl, prev);
1472 static void __nvme_scan_namespaces(struct nvme_ctrl *ctrl, unsigned nn)
1474 struct nvme_ns *ns, *next;
1477 lockdep_assert_held(&ctrl->namespaces_mutex);
1479 for (i = 1; i <= nn; i++)
1480 nvme_validate_ns(ctrl, i);
1482 list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
1488 void nvme_scan_namespaces(struct nvme_ctrl *ctrl)
1490 struct nvme_id_ctrl *id;
1493 if (nvme_identify_ctrl(ctrl, &id))
1496 mutex_lock(&ctrl->namespaces_mutex);
1497 nn = le32_to_cpu(id->nn);
1498 if (ctrl->vs >= NVME_VS(1, 1) &&
1499 !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) {
1500 if (!nvme_scan_ns_list(ctrl, nn))
1503 __nvme_scan_namespaces(ctrl, le32_to_cpup(&id->nn));
1505 list_sort(NULL, &ctrl->namespaces, ns_cmp);
1506 mutex_unlock(&ctrl->namespaces_mutex);
1509 EXPORT_SYMBOL_GPL(nvme_scan_namespaces);
1511 void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
1513 struct nvme_ns *ns, *next;
1515 list_for_each_entry_safe(ns, next, &ctrl->namespaces, list)
1518 EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
1520 static DEFINE_IDA(nvme_instance_ida);
1522 static int nvme_set_instance(struct nvme_ctrl *ctrl)
1524 int instance, error;
1527 if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL))
1530 spin_lock(&dev_list_lock);
1531 error = ida_get_new(&nvme_instance_ida, &instance);
1532 spin_unlock(&dev_list_lock);
1533 } while (error == -EAGAIN);
1538 ctrl->instance = instance;
1542 static void nvme_release_instance(struct nvme_ctrl *ctrl)
1544 spin_lock(&dev_list_lock);
1545 ida_remove(&nvme_instance_ida, ctrl->instance);
1546 spin_unlock(&dev_list_lock);
1549 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
1551 device_destroy(nvme_class, MKDEV(nvme_char_major, ctrl->instance));
1553 spin_lock(&dev_list_lock);
1554 list_del(&ctrl->node);
1555 spin_unlock(&dev_list_lock);
1557 EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
1559 static void nvme_free_ctrl(struct kref *kref)
1561 struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref);
1563 put_device(ctrl->device);
1564 nvme_release_instance(ctrl);
1565 ida_destroy(&ctrl->ns_ida);
1567 ctrl->ops->free_ctrl(ctrl);
1570 void nvme_put_ctrl(struct nvme_ctrl *ctrl)
1572 kref_put(&ctrl->kref, nvme_free_ctrl);
1574 EXPORT_SYMBOL_GPL(nvme_put_ctrl);
1577 * Initialize a NVMe controller structures. This needs to be called during
1578 * earliest initialization so that we have the initialized structured around
1581 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
1582 const struct nvme_ctrl_ops *ops, unsigned long quirks)
1586 INIT_LIST_HEAD(&ctrl->namespaces);
1587 mutex_init(&ctrl->namespaces_mutex);
1588 kref_init(&ctrl->kref);
1591 ctrl->quirks = quirks;
1593 ret = nvme_set_instance(ctrl);
1597 ctrl->device = device_create_with_groups(nvme_class, ctrl->dev,
1598 MKDEV(nvme_char_major, ctrl->instance),
1599 ctrl, nvme_dev_attr_groups,
1600 "nvme%d", ctrl->instance);
1601 if (IS_ERR(ctrl->device)) {
1602 ret = PTR_ERR(ctrl->device);
1603 goto out_release_instance;
1605 get_device(ctrl->device);
1606 ida_init(&ctrl->ns_ida);
1608 spin_lock(&dev_list_lock);
1609 list_add_tail(&ctrl->node, &nvme_ctrl_list);
1610 spin_unlock(&dev_list_lock);
1613 out_release_instance:
1614 nvme_release_instance(ctrl);
1618 EXPORT_SYMBOL_GPL(nvme_init_ctrl);
1621 * nvme_kill_queues(): Ends all namespace queues
1622 * @ctrl: the dead controller that needs to end
1624 * Call this function when the driver determines it is unable to get the
1625 * controller in a state capable of servicing IO.
1627 void nvme_kill_queues(struct nvme_ctrl *ctrl)
1631 mutex_lock(&ctrl->namespaces_mutex);
1632 list_for_each_entry(ns, &ctrl->namespaces, list) {
1633 if (!kref_get_unless_zero(&ns->kref))
1637 * Revalidating a dead namespace sets capacity to 0. This will
1638 * end buffered writers dirtying pages that can't be synced.
1640 if (!test_and_set_bit(NVME_NS_DEAD, &ns->flags))
1641 revalidate_disk(ns->disk);
1643 blk_set_queue_dying(ns->queue);
1644 blk_mq_abort_requeue_list(ns->queue);
1645 blk_mq_start_stopped_hw_queues(ns->queue, true);
1649 mutex_unlock(&ctrl->namespaces_mutex);
1651 EXPORT_SYMBOL_GPL(nvme_kill_queues);
1653 void nvme_stop_queues(struct nvme_ctrl *ctrl)
1657 mutex_lock(&ctrl->namespaces_mutex);
1658 list_for_each_entry(ns, &ctrl->namespaces, list) {
1659 spin_lock_irq(ns->queue->queue_lock);
1660 queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue);
1661 spin_unlock_irq(ns->queue->queue_lock);
1663 blk_mq_cancel_requeue_work(ns->queue);
1664 blk_mq_stop_hw_queues(ns->queue);
1666 mutex_unlock(&ctrl->namespaces_mutex);
1668 EXPORT_SYMBOL_GPL(nvme_stop_queues);
1670 void nvme_start_queues(struct nvme_ctrl *ctrl)
1674 mutex_lock(&ctrl->namespaces_mutex);
1675 list_for_each_entry(ns, &ctrl->namespaces, list) {
1676 queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue);
1677 blk_mq_start_stopped_hw_queues(ns->queue, true);
1678 blk_mq_kick_requeue_list(ns->queue);
1680 mutex_unlock(&ctrl->namespaces_mutex);
1682 EXPORT_SYMBOL_GPL(nvme_start_queues);
1684 int __init nvme_core_init(void)
1688 result = register_blkdev(nvme_major, "nvme");
1691 else if (result > 0)
1692 nvme_major = result;
1694 result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme",
1697 goto unregister_blkdev;
1698 else if (result > 0)
1699 nvme_char_major = result;
1701 nvme_class = class_create(THIS_MODULE, "nvme");
1702 if (IS_ERR(nvme_class)) {
1703 result = PTR_ERR(nvme_class);
1704 goto unregister_chrdev;
1710 __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
1712 unregister_blkdev(nvme_major, "nvme");
1716 void nvme_core_exit(void)
1718 unregister_blkdev(nvme_major, "nvme");
1719 class_destroy(nvme_class);
1720 __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
1723 MODULE_LICENSE("GPL");
1724 MODULE_VERSION("1.0");
1725 module_init(nvme_core_init);
1726 module_exit(nvme_core_exit);