| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Christoph Hellwig | 9723 | 50.64% | 90 | 30.61% |
| Keith Busch | 2592 | 13.50% | 49 | 16.67% |
| Jens Axboe | 988 | 5.15% | 6 | 2.04% |
| Andrew Lutomirski | 950 | 4.95% | 8 | 2.72% |
| Ming Lin | 902 | 4.70% | 8 | 2.72% |
| Sagi Grimberg | 796 | 4.15% | 17 | 5.78% |
| Johannes Thumshirn | 557 | 2.90% | 8 | 2.72% |
| Matias Björling | 345 | 1.80% | 7 | 2.38% |
| Scott Bauer | 319 | 1.66% | 6 | 2.04% |
| Hannes Reinecke | 272 | 1.42% | 6 | 2.04% |
| Arnav Dawn | 261 | 1.36% | 2 | 0.68% |
| Jianchao Wang | 211 | 1.10% | 5 | 1.70% |
| Max Gurtovoy | 170 | 0.89% | 10 | 3.40% |
| James Smart | 164 | 0.85% | 5 | 1.70% |
| Roy Shterman | 102 | 0.53% | 1 | 0.34% |
| Jon Derrick | 97 | 0.51% | 1 | 0.34% |
| Chaitanya Kulkarni | 90 | 0.47% | 5 | 1.70% |
| Nitzan Carmi | 88 | 0.46% | 4 | 1.36% |
| Israel Rukshin | 78 | 0.41% | 2 | 0.68% |
| Martin K. Petersen | 65 | 0.34% | 1 | 0.34% |
| Sunad Bhandary | 58 | 0.30% | 1 | 0.34% |
| Kai-Heng Feng | 46 | 0.24% | 3 | 1.02% |
| Martin Wilck | 36 | 0.19% | 3 | 1.02% |
| Nicholas Bellinger | 35 | 0.18% | 1 | 0.34% |
| Ming Lei | 29 | 0.15% | 3 | 1.02% |
| Jeff Lien | 27 | 0.14% | 1 | 0.34% |
| Gabriel Krisman Bertazi | 22 | 0.11% | 2 | 0.68% |
| Logan Gunthorpe | 17 | 0.09% | 1 | 0.34% |
| weiping zhang | 16 | 0.08% | 1 | 0.34% |
| James Dingwall | 13 | 0.07% | 1 | 0.34% |
| Jay Freyensee | 13 | 0.07% | 1 | 0.34% |
| Linus Torvalds | 11 | 0.06% | 2 | 0.68% |
| Guilherme G. Piccoli | 11 | 0.06% | 1 | 0.34% |
| Thomas Tai | 10 | 0.05% | 1 | 0.34% |
| Bart Van Assche | 9 | 0.05% | 6 | 2.04% |
| Junxiong Guan | 9 | 0.05% | 1 | 0.34% |
| Parav Pandit | 8 | 0.04% | 1 | 0.34% |
| Igor Konopko | 8 | 0.04% | 1 | 0.34% |
| Kwan (Hingkwan) Huen-SSI | 6 | 0.03% | 1 | 0.34% |
| Charles Machalow | 6 | 0.03% | 1 | 0.34% |
| Dan J Williams | 5 | 0.03% | 1 | 0.34% |
| Joe Perches | 5 | 0.03% | 1 | 0.34% |
| Roland Dreier | 4 | 0.02% | 2 | 0.68% |
| Ivan Bornyakov | 4 | 0.02% | 1 | 0.34% |
| Marc Olson | 4 | 0.02% | 1 | 0.34% |
| Dan Carpenter | 4 | 0.02% | 2 | 0.68% |
| Arnd Bergmann | 3 | 0.02% | 1 | 0.34% |
| Javier González | 3 | 0.02% | 2 | 0.68% |
| Minwoo Im | 3 | 0.02% | 2 | 0.68% |
| Michael Christie | 2 | 0.01% | 2 | 0.68% |
| Milan P. Gandhi | 1 | 0.01% | 1 | 0.34% |
| David Disseldorp | 1 | 0.01% | 1 | 0.34% |
| Lei Ming | 1 | 0.01% | 1 | 0.34% |
| Chengguang Xu | 1 | 0.01% | 1 | 0.34% |
| Minfei Huang | 1 | 0.01% | 1 | 0.34% |
| Total | 19202 | 294 |
/* * NVM Express device driver * Copyright (c) 2011-2014, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. */ #include <linux/blkdev.h> #include <linux/blk-mq.h> #include <linux/delay.h> #include <linux/errno.h> #include <linux/hdreg.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/list_sort.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/pr.h> #include <linux/ptrace.h> #include <linux/nvme_ioctl.h> #include <linux/t10-pi.h> #include <linux/pm_qos.h> #include <asm/unaligned.h> #define CREATE_TRACE_POINTS #include "trace.h" #include "nvme.h" #include "fabrics.h" #define NVME_MINORS (1U << MINORBITS) unsigned int admin_timeout = 60; module_param(admin_timeout, uint, 0644); MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands"); EXPORT_SYMBOL_GPL(admin_timeout); unsigned int nvme_io_timeout = 30; module_param_named(io_timeout, nvme_io_timeout, uint, 0644); MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O"); EXPORT_SYMBOL_GPL(nvme_io_timeout); static unsigned char shutdown_timeout = 5; module_param(shutdown_timeout, byte, 0644); MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown"); static u8 nvme_max_retries = 5; module_param_named(max_retries, nvme_max_retries, byte, 0644); MODULE_PARM_DESC(max_retries, "max number of retries a command may have"); static unsigned long default_ps_max_latency_us = 100000; module_param(default_ps_max_latency_us, ulong, 0644); MODULE_PARM_DESC(default_ps_max_latency_us, "max power saving latency for new devices; use PM QOS to change per device"); static bool force_apst; module_param(force_apst, bool, 0644); MODULE_PARM_DESC(force_apst, "allow APST for newly enumerated devices even if quirked off"); static bool streams; module_param(streams, bool, 0644); MODULE_PARM_DESC(streams, "turn on support for Streams write directives"); /* * nvme_wq - hosts nvme related works that are not reset or delete * nvme_reset_wq - hosts nvme reset works * nvme_delete_wq - hosts nvme delete works * * nvme_wq will host works such are scan, aen handling, fw activation, * keep-alive error recovery, periodic reconnects etc. nvme_reset_wq * runs reset works which also flush works hosted on nvme_wq for * serialization purposes. nvme_delete_wq host controller deletion * works which flush reset works for serialization. */ struct workqueue_struct *nvme_wq; EXPORT_SYMBOL_GPL(nvme_wq); struct workqueue_struct *nvme_reset_wq; EXPORT_SYMBOL_GPL(nvme_reset_wq); struct workqueue_struct *nvme_delete_wq; EXPORT_SYMBOL_GPL(nvme_delete_wq); static DEFINE_IDA(nvme_subsystems_ida); static LIST_HEAD(nvme_subsystems); static DEFINE_MUTEX(nvme_subsystems_lock); static DEFINE_IDA(nvme_instance_ida); static dev_t nvme_chr_devt; static struct class *nvme_class; static struct class *nvme_subsys_class; static int nvme_revalidate_disk(struct gendisk *disk); static void nvme_put_subsystem(struct nvme_subsystem *subsys); static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl, unsigned nsid); static void nvme_set_queue_dying(struct nvme_ns *ns) { /* * Revalidating a dead namespace sets capacity to 0. This will end * buffered writers dirtying pages that can't be synced. */ if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags)) return; revalidate_disk(ns->disk); blk_set_queue_dying(ns->queue); /* Forcibly unquiesce queues to avoid blocking dispatch */ blk_mq_unquiesce_queue(ns->queue); } static void nvme_queue_scan(struct nvme_ctrl *ctrl) { /* * Only new queue scan work when admin and IO queues are both alive */ if (ctrl->state == NVME_CTRL_LIVE) queue_work(nvme_wq, &ctrl->scan_work); } int nvme_reset_ctrl(struct nvme_ctrl *ctrl) { if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING)) return -EBUSY; if (!queue_work(nvme_reset_wq, &ctrl->reset_work)) return -EBUSY; return 0; } EXPORT_SYMBOL_GPL(nvme_reset_ctrl); int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl) { int ret; ret = nvme_reset_ctrl(ctrl); if (!ret) { flush_work(&ctrl->reset_work); if (ctrl->state != NVME_CTRL_LIVE && ctrl->state != NVME_CTRL_ADMIN_ONLY) ret = -ENETRESET; } return ret; } EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync); static void nvme_delete_ctrl_work(struct work_struct *work) { struct nvme_ctrl *ctrl = container_of(work, struct nvme_ctrl, delete_work); dev_info(ctrl->device, "Removing ctrl: NQN \"%s\"\n", ctrl->opts->subsysnqn); flush_work(&ctrl->reset_work); nvme_stop_ctrl(ctrl); nvme_remove_namespaces(ctrl); ctrl->ops->delete_ctrl(ctrl); nvme_uninit_ctrl(ctrl); nvme_put_ctrl(ctrl); } int nvme_delete_ctrl(struct nvme_ctrl *ctrl) { if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING)) return -EBUSY; if (!queue_work(nvme_delete_wq, &ctrl->delete_work)) return -EBUSY; return 0; } EXPORT_SYMBOL_GPL(nvme_delete_ctrl); int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl) { int ret = 0; /* * Keep a reference until the work is flushed since ->delete_ctrl * can free the controller. */ nvme_get_ctrl(ctrl); ret = nvme_delete_ctrl(ctrl); if (!ret) flush_work(&ctrl->delete_work); nvme_put_ctrl(ctrl); return ret; } EXPORT_SYMBOL_GPL(nvme_delete_ctrl_sync); static inline bool nvme_ns_has_pi(struct nvme_ns *ns) { return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple); } static blk_status_t nvme_error_status(struct request *req) { switch (nvme_req(req)->status & 0x7ff) { case NVME_SC_SUCCESS: return BLK_STS_OK; case NVME_SC_CAP_EXCEEDED: return BLK_STS_NOSPC; case NVME_SC_LBA_RANGE: return BLK_STS_TARGET; case NVME_SC_BAD_ATTRIBUTES: case NVME_SC_ONCS_NOT_SUPPORTED: case NVME_SC_INVALID_OPCODE: case NVME_SC_INVALID_FIELD: case NVME_SC_INVALID_NS: return BLK_STS_NOTSUPP; case NVME_SC_WRITE_FAULT: case NVME_SC_READ_ERROR: case NVME_SC_UNWRITTEN_BLOCK: case NVME_SC_ACCESS_DENIED: case NVME_SC_READ_ONLY: case NVME_SC_COMPARE_FAILED: return BLK_STS_MEDIUM; case NVME_SC_GUARD_CHECK: case NVME_SC_APPTAG_CHECK: case NVME_SC_REFTAG_CHECK: case NVME_SC_INVALID_PI: return BLK_STS_PROTECTION; case NVME_SC_RESERVATION_CONFLICT: return BLK_STS_NEXUS; default: return BLK_STS_IOERR; } } static inline bool nvme_req_needs_retry(struct request *req) { if (blk_noretry_request(req)) return false; if (nvme_req(req)->status & NVME_SC_DNR) return false; if (nvme_req(req)->retries >= nvme_max_retries) return false; return true; } static void nvme_retry_req(struct request *req) { struct nvme_ns *ns = req->q->queuedata; unsigned long delay = 0; u16 crd; /* The mask and shift result must be <= 3 */ crd = (nvme_req(req)->status & NVME_SC_CRD) >> 11; if (ns && crd) delay = ns->ctrl->crdt[crd - 1] * 100; nvme_req(req)->retries++; blk_mq_requeue_request(req, false); blk_mq_delay_kick_requeue_list(req->q, delay); } void nvme_complete_rq(struct request *req) { blk_status_t status = nvme_error_status(req); trace_nvme_complete_rq(req); if (nvme_req(req)->ctrl->kas) nvme_req(req)->ctrl->comp_seen = true; if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) { if ((req->cmd_flags & REQ_NVME_MPATH) && blk_path_error(status)) { nvme_failover_req(req); return; } if (!blk_queue_dying(req->q)) { nvme_retry_req(req); return; } } blk_mq_end_request(req, status); } EXPORT_SYMBOL_GPL(nvme_complete_rq); bool nvme_cancel_request(struct request *req, void *data, bool reserved) { dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device, "Cancelling I/O %d", req->tag); nvme_req(req)->status = NVME_SC_ABORT_REQ; blk_mq_complete_request(req); return true; } EXPORT_SYMBOL_GPL(nvme_cancel_request); bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl, enum nvme_ctrl_state new_state) { enum nvme_ctrl_state old_state; unsigned long flags; bool changed = false; spin_lock_irqsave(&ctrl->lock, flags); old_state = ctrl->state; switch (new_state) { case NVME_CTRL_ADMIN_ONLY: switch (old_state) { case NVME_CTRL_CONNECTING: changed = true; /* FALLTHRU */ default: break; } break; case NVME_CTRL_LIVE: switch (old_state) { case NVME_CTRL_NEW: case NVME_CTRL_RESETTING: case NVME_CTRL_CONNECTING: changed = true; /* FALLTHRU */ default: break; } break; case NVME_CTRL_RESETTING: switch (old_state) { case NVME_CTRL_NEW: case NVME_CTRL_LIVE: case NVME_CTRL_ADMIN_ONLY: changed = true; /* FALLTHRU */ default: break; } break; case NVME_CTRL_CONNECTING: switch (old_state) { case NVME_CTRL_NEW: case NVME_CTRL_RESETTING: changed = true; /* FALLTHRU */ default: break; } break; case NVME_CTRL_DELETING: switch (old_state) { case NVME_CTRL_LIVE: case NVME_CTRL_ADMIN_ONLY: case NVME_CTRL_RESETTING: case NVME_CTRL_CONNECTING: changed = true; /* FALLTHRU */ default: break; } break; case NVME_CTRL_DEAD: switch (old_state) { case NVME_CTRL_DELETING: changed = true; /* FALLTHRU */ default: break; } break; default: break; } if (changed) ctrl->state = new_state; spin_unlock_irqrestore(&ctrl->lock, flags); if (changed && ctrl->state == NVME_CTRL_LIVE) nvme_kick_requeue_lists(ctrl); return changed; } EXPORT_SYMBOL_GPL(nvme_change_ctrl_state); static void nvme_free_ns_head(struct kref *ref) { struct nvme_ns_head *head = container_of(ref, struct nvme_ns_head, ref); nvme_mpath_remove_disk(head); ida_simple_remove(&head->subsys->ns_ida, head->instance); list_del_init(&head->entry); cleanup_srcu_struct_quiesced(&head->srcu); nvme_put_subsystem(head->subsys); kfree(head); } static void nvme_put_ns_head(struct nvme_ns_head *head) { kref_put(&head->ref, nvme_free_ns_head); } static void nvme_free_ns(struct kref *kref) { struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref); if (ns->ndev) nvme_nvm_unregister(ns); put_disk(ns->disk); nvme_put_ns_head(ns->head); nvme_put_ctrl(ns->ctrl); kfree(ns); } static void nvme_put_ns(struct nvme_ns *ns) { kref_put(&ns->kref, nvme_free_ns); } static inline void nvme_clear_nvme_request(struct request *req) { if (!(req->rq_flags & RQF_DONTPREP)) { nvme_req(req)->retries = 0; nvme_req(req)->flags = 0; req->rq_flags |= RQF_DONTPREP; } } struct request *nvme_alloc_request(struct request_queue *q, struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid) { unsigned op = nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN; struct request *req; if (qid == NVME_QID_ANY) { req = blk_mq_alloc_request(q, op, flags); } else { req = blk_mq_alloc_request_hctx(q, op, flags, qid ? qid - 1 : 0); } if (IS_ERR(req)) return req; req->cmd_flags |= REQ_FAILFAST_DRIVER; nvme_clear_nvme_request(req); nvme_req(req)->cmd = cmd; return req; } EXPORT_SYMBOL_GPL(nvme_alloc_request); static int nvme_toggle_streams(struct nvme_ctrl *ctrl, bool enable) { struct nvme_command c; memset(&c, 0, sizeof(c)); c.directive.opcode = nvme_admin_directive_send; c.directive.nsid = cpu_to_le32(NVME_NSID_ALL); c.directive.doper = NVME_DIR_SND_ID_OP_ENABLE; c.directive.dtype = NVME_DIR_IDENTIFY; c.directive.tdtype = NVME_DIR_STREAMS; c.directive.endir = enable ? NVME_DIR_ENDIR : 0; return nvme_submit_sync_cmd(ctrl->admin_q, &c, NULL, 0); } static int nvme_disable_streams(struct nvme_ctrl *ctrl) { return nvme_toggle_streams(ctrl, false); } static int nvme_enable_streams(struct nvme_ctrl *ctrl) { return nvme_toggle_streams(ctrl, true); } static int nvme_get_stream_params(struct nvme_ctrl *ctrl, struct streams_directive_params *s, u32 nsid) { struct nvme_command c; memset(&c, 0, sizeof(c)); memset(s, 0, sizeof(*s)); c.directive.opcode = nvme_admin_directive_recv; c.directive.nsid = cpu_to_le32(nsid); c.directive.numd = cpu_to_le32((sizeof(*s) >> 2) - 1); c.directive.doper = NVME_DIR_RCV_ST_OP_PARAM; c.directive.dtype = NVME_DIR_STREAMS; return nvme_submit_sync_cmd(ctrl->admin_q, &c, s, sizeof(*s)); } static int nvme_configure_directives(struct nvme_ctrl *ctrl) { struct streams_directive_params s; int ret; if (!(ctrl->oacs & NVME_CTRL_OACS_DIRECTIVES)) return 0; if (!streams) return 0; ret = nvme_enable_streams(ctrl); if (ret) return ret; ret = nvme_get_stream_params(ctrl, &s, NVME_NSID_ALL); if (ret) return ret; ctrl->nssa = le16_to_cpu(s.nssa); if (ctrl->nssa < BLK_MAX_WRITE_HINTS - 1) { dev_info(ctrl->device, "too few streams (%u) available\n", ctrl->nssa); nvme_disable_streams(ctrl); return 0; } ctrl->nr_streams = min_t(unsigned, ctrl->nssa, BLK_MAX_WRITE_HINTS - 1); dev_info(ctrl->device, "Using %u streams\n", ctrl->nr_streams); return 0; } /* * Check if 'req' has a write hint associated with it. If it does, assign * a valid namespace stream to the write. */ static void nvme_assign_write_stream(struct nvme_ctrl *ctrl, struct request *req, u16 *control, u32 *dsmgmt) { enum rw_hint streamid = req->write_hint; if (streamid == WRITE_LIFE_NOT_SET || streamid == WRITE_LIFE_NONE) streamid = 0; else { streamid--; if (WARN_ON_ONCE(streamid > ctrl->nr_streams)) return; *control |= NVME_RW_DTYPE_STREAMS; *dsmgmt |= streamid << 16; } if (streamid < ARRAY_SIZE(req->q->write_hints)) req->q->write_hints[streamid] += blk_rq_bytes(req) >> 9; } static inline void nvme_setup_flush(struct nvme_ns *ns, struct nvme_command *cmnd) { cmnd->common.opcode = nvme_cmd_flush; cmnd->common.nsid = cpu_to_le32(ns->head->ns_id); } static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req, struct nvme_command *cmnd) { unsigned short segments = blk_rq_nr_discard_segments(req), n = 0; struct nvme_dsm_range *range; struct bio *bio; range = kmalloc_array(segments, sizeof(*range), GFP_ATOMIC | __GFP_NOWARN); if (!range) { /* * If we fail allocation our range, fallback to the controller * discard page. If that's also busy, it's safe to return * busy, as we know we can make progress once that's freed. */ if (test_and_set_bit_lock(0, &ns->ctrl->discard_page_busy)) return BLK_STS_RESOURCE; range = page_address(ns->ctrl->discard_page); } __rq_for_each_bio(bio, req) { u64 slba = nvme_block_nr(ns, bio->bi_iter.bi_sector); u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift; if (n < segments) { range[n].cattr = cpu_to_le32(0); range[n].nlb = cpu_to_le32(nlb); range[n].slba = cpu_to_le64(slba); } n++; } if (WARN_ON_ONCE(n != segments)) { if (virt_to_page(range) == ns->ctrl->discard_page) clear_bit_unlock(0, &ns->ctrl->discard_page_busy); else kfree(range); return BLK_STS_IOERR; } cmnd->dsm.opcode = nvme_cmd_dsm; cmnd->dsm.nsid = cpu_to_le32(ns->head->ns_id); cmnd->dsm.nr = cpu_to_le32(segments - 1); cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); req->special_vec.bv_page = virt_to_page(range); req->special_vec.bv_offset = offset_in_page(range); req->special_vec.bv_len = sizeof(*range) * segments; req->rq_flags |= RQF_SPECIAL_PAYLOAD; return BLK_STS_OK; } static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns, struct request *req, struct nvme_command *cmnd) { struct nvme_ctrl *ctrl = ns->ctrl; u16 control = 0; u32 dsmgmt = 0; if (req->cmd_flags & REQ_FUA) control |= NVME_RW_FUA; if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD)) control |= NVME_RW_LR; if (req->cmd_flags & REQ_RAHEAD) dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH; cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read); cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id); cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1); if (req_op(req) == REQ_OP_WRITE && ctrl->nr_streams) nvme_assign_write_stream(ctrl, req, &control, &dsmgmt); if (ns->ms) { /* * If formated with metadata, the block layer always provides a * metadata buffer if CONFIG_BLK_DEV_INTEGRITY is enabled. Else * we enable the PRACT bit for protection information or set the * namespace capacity to zero to prevent any I/O. */ if (!blk_integrity_rq(req)) { if (WARN_ON_ONCE(!nvme_ns_has_pi(ns))) return BLK_STS_NOTSUPP; control |= NVME_RW_PRINFO_PRACT; } else if (req_op(req) == REQ_OP_WRITE) { t10_pi_prepare(req, ns->pi_type); } switch (ns->pi_type) { case NVME_NS_DPS_PI_TYPE3: control |= NVME_RW_PRINFO_PRCHK_GUARD; break; case NVME_NS_DPS_PI_TYPE1: case NVME_NS_DPS_PI_TYPE2: control |= NVME_RW_PRINFO_PRCHK_GUARD | NVME_RW_PRINFO_PRCHK_REF; cmnd->rw.reftag = cpu_to_le32(t10_pi_ref_tag(req)); break; } } cmnd->rw.control = cpu_to_le16(control); cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt); return 0; } void nvme_cleanup_cmd(struct request *req) { if (blk_integrity_rq(req) && req_op(req) == REQ_OP_READ && nvme_req(req)->status == 0) { struct nvme_ns *ns = req->rq_disk->private_data; t10_pi_complete(req, ns->pi_type, blk_rq_bytes(req) >> ns->lba_shift); } if (req->rq_flags & RQF_SPECIAL_PAYLOAD) { struct nvme_ns *ns = req->rq_disk->private_data; struct page *page = req->special_vec.bv_page; if (page == ns->ctrl->discard_page) clear_bit_unlock(0, &ns->ctrl->discard_page_busy); else kfree(page_address(page) + req->special_vec.bv_offset); } } EXPORT_SYMBOL_GPL(nvme_cleanup_cmd); blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req, struct nvme_command *cmd) { blk_status_t ret = BLK_STS_OK; nvme_clear_nvme_request(req); memset(cmd, 0, sizeof(*cmd)); switch (req_op(req)) { case REQ_OP_DRV_IN: case REQ_OP_DRV_OUT: memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd)); break; case REQ_OP_FLUSH: nvme_setup_flush(ns, cmd); break; case REQ_OP_WRITE_ZEROES: /* currently only aliased to deallocate for a few ctrls: */ case REQ_OP_DISCARD: ret = nvme_setup_discard(ns, req, cmd); break; case REQ_OP_READ: case REQ_OP_WRITE: ret = nvme_setup_rw(ns, req, cmd); break; default: WARN_ON_ONCE(1); return BLK_STS_IOERR; } cmd->common.command_id = req->tag; trace_nvme_setup_cmd(req, cmd); return ret; } EXPORT_SYMBOL_GPL(nvme_setup_cmd); static void nvme_end_sync_rq(struct request *rq, blk_status_t error) { struct completion *waiting = rq->end_io_data; rq->end_io_data = NULL; complete(waiting); } static void nvme_execute_rq_polled(struct request_queue *q, struct gendisk *bd_disk, struct request *rq, int at_head) { DECLARE_COMPLETION_ONSTACK(wait); WARN_ON_ONCE(!test_bit(QUEUE_FLAG_POLL, &q->queue_flags)); rq->cmd_flags |= REQ_HIPRI; rq->end_io_data = &wait; blk_execute_rq_nowait(q, bd_disk, rq, at_head, nvme_end_sync_rq); while (!completion_done(&wait)) { blk_poll(q, request_to_qc_t(rq->mq_hctx, rq), true); cond_resched(); } } /* * Returns 0 on success. If the result is negative, it's a Linux error code; * if the result is positive, it's an NVM Express status code */ int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, union nvme_result *result, void *buffer, unsigned bufflen, unsigned timeout, int qid, int at_head, blk_mq_req_flags_t flags, bool poll) { struct request *req; int ret; req = nvme_alloc_request(q, cmd, flags, qid); if (IS_ERR(req)) return PTR_ERR(req); req->timeout = timeout ? timeout : ADMIN_TIMEOUT; if (buffer && bufflen) { ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL); if (ret) goto out; } if (poll) nvme_execute_rq_polled(req->q, NULL, req, at_head); else blk_execute_rq(req->q, NULL, req, at_head); if (result) *result = nvme_req(req)->result; if (nvme_req(req)->flags & NVME_REQ_CANCELLED) ret = -EINTR; else ret = nvme_req(req)->status; out: blk_mq_free_request(req); return ret; } EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd); int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, void *buffer, unsigned bufflen) { return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0, NVME_QID_ANY, 0, 0, false); } EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd); static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf, unsigned len, u32 seed, bool write) { struct bio_integrity_payload *bip; int ret = -ENOMEM; void *buf; buf = kmalloc(len, GFP_KERNEL); if (!buf) goto out; ret = -EFAULT; if (write && copy_from_user(buf, ubuf, len)) goto out_free_meta; bip = bio_integrity_alloc(bio, GFP_KERNEL, 1); if (IS_ERR(bip)) { ret = PTR_ERR(bip); goto out_free_meta; } bip->bip_iter.bi_size = len; bip->bip_iter.bi_sector = seed; ret = bio_integrity_add_page(bio, virt_to_page(buf), len, offset_in_page(buf)); if (ret == len) return buf; ret = -ENOMEM; out_free_meta: kfree(buf); out: return ERR_PTR(ret); } static int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd, void __user *ubuffer, unsigned bufflen, void __user *meta_buffer, unsigned meta_len, u32 meta_seed, u32 *result, unsigned timeout) { bool write = nvme_is_write(cmd); struct nvme_ns *ns = q->queuedata; struct gendisk *disk = ns ? ns->disk : NULL; struct request *req; struct bio *bio = NULL; void *meta = NULL; int ret; req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY); if (IS_ERR(req)) return PTR_ERR(req); req->timeout = timeout ? timeout : ADMIN_TIMEOUT; nvme_req(req)->flags |= NVME_REQ_USERCMD; if (ubuffer && bufflen) { ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, GFP_KERNEL); if (ret) goto out; bio = req->bio; bio->bi_disk = disk; if (disk && meta_buffer && meta_len) { meta = nvme_add_user_metadata(bio, meta_buffer, meta_len, meta_seed, write); if (IS_ERR(meta)) { ret = PTR_ERR(meta); goto out_unmap; } req->cmd_flags |= REQ_INTEGRITY; } } blk_execute_rq(req->q, disk, req, 0); if (nvme_req(req)->flags & NVME_REQ_CANCELLED) ret = -EINTR; else ret = nvme_req(req)->status; if (result) *result = le32_to_cpu(nvme_req(req)->result.u32); if (meta && !ret && !write) { if (copy_to_user(meta_buffer, meta, meta_len)) ret = -EFAULT; } kfree(meta); out_unmap: if (bio) blk_rq_unmap_user(bio); out: blk_mq_free_request(req); return ret; } static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status) { struct nvme_ctrl *ctrl = rq->end_io_data; unsigned long flags; bool startka = false; blk_mq_free_request(rq); if (status) { dev_err(ctrl->device, "failed nvme_keep_alive_end_io error=%d\n", status); return; } ctrl->comp_seen = false; spin_lock_irqsave(&ctrl->lock, flags); if (ctrl->state == NVME_CTRL_LIVE || ctrl->state == NVME_CTRL_CONNECTING) startka = true; spin_unlock_irqrestore(&ctrl->lock, flags); if (startka) schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); } static int nvme_keep_alive(struct nvme_ctrl *ctrl) { struct request *rq; rq = nvme_alloc_request(ctrl->admin_q, &ctrl->ka_cmd, BLK_MQ_REQ_RESERVED, NVME_QID_ANY); if (IS_ERR(rq)) return PTR_ERR(rq); rq->timeout = ctrl->kato * HZ; rq->end_io_data = ctrl; blk_execute_rq_nowait(rq->q, NULL, rq, 0, nvme_keep_alive_end_io); return 0; } static void nvme_keep_alive_work(struct work_struct *work) { struct nvme_ctrl *ctrl = container_of(to_delayed_work(work), struct nvme_ctrl, ka_work); bool comp_seen = ctrl->comp_seen; if ((ctrl->ctratt & NVME_CTRL_ATTR_TBKAS) && comp_seen) { dev_dbg(ctrl->device, "reschedule traffic based keep-alive timer\n"); ctrl->comp_seen = false; schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); return; } if (nvme_keep_alive(ctrl)) { /* allocation failure, reset the controller */ dev_err(ctrl->device, "keep-alive failed\n"); nvme_reset_ctrl(ctrl); return; } } static void nvme_start_keep_alive(struct nvme_ctrl *ctrl) { if (unlikely(ctrl->kato == 0)) return; schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); } void nvme_stop_keep_alive(struct nvme_ctrl *ctrl) { if (unlikely(ctrl->kato == 0)) return; cancel_delayed_work_sync(&ctrl->ka_work); } EXPORT_SYMBOL_GPL(nvme_stop_keep_alive); static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id) { struct nvme_command c = { }; int error; /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ c.identify.opcode = nvme_admin_identify; c.identify.cns = NVME_ID_CNS_CTRL; *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL); if (!*id) return -ENOMEM; error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, sizeof(struct nvme_id_ctrl)); if (error) kfree(*id); return error; } static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid, struct nvme_ns_ids *ids) { struct nvme_command c = { }; int status; void *data; int pos; int len; c.identify.opcode = nvme_admin_identify; c.identify.nsid = cpu_to_le32(nsid); c.identify.cns = NVME_ID_CNS_NS_DESC_LIST; data = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL); if (!data) return -ENOMEM; status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data, NVME_IDENTIFY_DATA_SIZE); if (status) goto free_data; for (pos = 0; pos < NVME_IDENTIFY_DATA_SIZE; pos += len) { struct nvme_ns_id_desc *cur = data + pos; if (cur->nidl == 0) break; switch (cur->nidt) { case NVME_NIDT_EUI64: if (cur->nidl != NVME_NIDT_EUI64_LEN) { dev_warn(ctrl->device, "ctrl returned bogus length: %d for NVME_NIDT_EUI64\n", cur->nidl); goto free_data; } len = NVME_NIDT_EUI64_LEN; memcpy(ids->eui64, data + pos + sizeof(*cur), len); break; case NVME_NIDT_NGUID: if (cur->nidl != NVME_NIDT_NGUID_LEN) { dev_warn(ctrl->device, "ctrl returned bogus length: %d for NVME_NIDT_NGUID\n", cur->nidl); goto free_data; } len = NVME_NIDT_NGUID_LEN; memcpy(ids->nguid, data + pos + sizeof(*cur), len); break; case NVME_NIDT_UUID: if (cur->nidl != NVME_NIDT_UUID_LEN) { dev_warn(ctrl->device, "ctrl returned bogus length: %d for NVME_NIDT_UUID\n", cur->nidl); goto free_data; } len = NVME_NIDT_UUID_LEN; uuid_copy(&ids->uuid, data + pos + sizeof(*cur)); break; default: /* Skip unknown types */ len = cur->nidl; break; } len += sizeof(*cur); } free_data: kfree(data); return status; } static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list) { struct nvme_command c = { }; c.identify.opcode = nvme_admin_identify; c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST; c.identify.nsid = cpu_to_le32(nsid); return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, NVME_IDENTIFY_DATA_SIZE); } static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl, unsigned nsid) { struct nvme_id_ns *id; struct nvme_command c = { }; int error; /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ c.identify.opcode = nvme_admin_identify; c.identify.nsid = cpu_to_le32(nsid); c.identify.cns = NVME_ID_CNS_NS; id = kmalloc(sizeof(*id), GFP_KERNEL); if (!id) return NULL; error = nvme_submit_sync_cmd(ctrl->admin_q, &c, id, sizeof(*id)); if (error) { dev_warn(ctrl->device, "Identify namespace failed\n"); kfree(id); return NULL; } return id; } static int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11, void *buffer, size_t buflen, u32 *result) { struct nvme_command c; union nvme_result res; int ret; memset(&c, 0, sizeof(c)); c.features.opcode = nvme_admin_set_features; c.features.fid = cpu_to_le32(fid); c.features.dword11 = cpu_to_le32(dword11); ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res, buffer, buflen, 0, NVME_QID_ANY, 0, 0, false); if (ret >= 0 && result) *result = le32_to_cpu(res.u32); return ret; } int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count) { u32 q_count = (*count - 1) | ((*count - 1) << 16); u32 result; int status, nr_io_queues; status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0, &result); if (status < 0) return status; /* * Degraded controllers might return an error when setting the queue * count. We still want to be able to bring them online and offer * access to the admin queue, as that might be only way to fix them up. */ if (status > 0) { dev_err(ctrl->device, "Could not set queue count (%d)\n", status); *count = 0; } else { nr_io_queues = min(result & 0xffff, result >> 16) + 1; *count = min(*count, nr_io_queues); } return 0; } EXPORT_SYMBOL_GPL(nvme_set_queue_count); #define NVME_AEN_SUPPORTED \ (NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_FW_ACT | NVME_AEN_CFG_ANA_CHANGE) static void nvme_enable_aen(struct nvme_ctrl *ctrl) { u32 result, supported_aens = ctrl->oaes & NVME_AEN_SUPPORTED; int status; if (!supported_aens) return; status = nvme_set_features(ctrl, NVME_FEAT_ASYNC_EVENT, supported_aens, NULL, 0, &result); if (status) dev_warn(ctrl->device, "Failed to configure AEN (cfg %x)\n", supported_aens); } static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) { struct nvme_user_io io; struct nvme_command c; unsigned length, meta_len; void __user *metadata; if (copy_from_user(&io, uio, sizeof(io))) return -EFAULT; if (io.flags) return -EINVAL; switch (io.opcode) { case nvme_cmd_write: case nvme_cmd_read: case nvme_cmd_compare: break; default: return -EINVAL; } length = (io.nblocks + 1) << ns->lba_shift; meta_len = (io.nblocks + 1) * ns->ms; metadata = (void __user *)(uintptr_t)io.metadata; if (ns->ext) { length += meta_len; meta_len = 0; } else if (meta_len) { if ((io.metadata & 3) || !io.metadata) return -EINVAL; } memset(&c, 0, sizeof(c)); c.rw.opcode = io.opcode; c.rw.flags = io.flags; c.rw.nsid = cpu_to_le32(ns->head->ns_id); c.rw.slba = cpu_to_le64(io.slba); c.rw.length = cpu_to_le16(io.nblocks); c.rw.control = cpu_to_le16(io.control); c.rw.dsmgmt = cpu_to_le32(io.dsmgmt); c.rw.reftag = cpu_to_le32(io.reftag); c.rw.apptag = cpu_to_le16(io.apptag); c.rw.appmask = cpu_to_le16(io.appmask); return nvme_submit_user_cmd(ns->queue, &c, (void __user *)(uintptr_t)io.addr, length, metadata, meta_len, lower_32_bits(io.slba), NULL, 0); } static u32 nvme_known_admin_effects(u8 opcode) { switch (opcode) { case nvme_admin_format_nvm: return NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK; case nvme_admin_sanitize_nvm: return NVME_CMD_EFFECTS_CSE_MASK; default: break; } return 0; } static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u8 opcode) { u32 effects = 0; if (ns) { if (ctrl->effects) effects = le32_to_cpu(ctrl->effects->iocs[opcode]); if (effects & ~NVME_CMD_EFFECTS_CSUPP) dev_warn(ctrl->device, "IO command:%02x has unhandled effects:%08x\n", opcode, effects); return 0; } if (ctrl->effects) effects = le32_to_cpu(ctrl->effects->acs[opcode]); else effects = nvme_known_admin_effects(opcode); /* * For simplicity, IO to all namespaces is quiesced even if the command * effects say only one namespace is affected. */ if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) { mutex_lock(&ctrl->scan_lock); nvme_start_freeze(ctrl); nvme_wait_freeze(ctrl); } return effects; } static void nvme_update_formats(struct nvme_ctrl *ctrl) { struct nvme_ns *ns; down_read(&ctrl->namespaces_rwsem); list_for_each_entry(ns, &ctrl->namespaces, list) if (ns->disk && nvme_revalidate_disk(ns->disk)) nvme_set_queue_dying(ns); up_read(&ctrl->namespaces_rwsem); nvme_remove_invalid_namespaces(ctrl, NVME_NSID_ALL); } static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects) { /* * Revalidate LBA changes prior to unfreezing. This is necessary to * prevent memory corruption if a logical block size was changed by * this command. */ if (effects & NVME_CMD_EFFECTS_LBCC) nvme_update_formats(ctrl); if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) { nvme_unfreeze(ctrl); mutex_unlock(&ctrl->scan_lock); } if (effects & NVME_CMD_EFFECTS_CCC) nvme_init_identify(ctrl); if (effects & (NVME_CMD_EFFECTS_NIC | NVME_CMD_EFFECTS_NCC)) nvme_queue_scan(ctrl); } static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns, struct nvme_passthru_cmd __user *ucmd) { struct nvme_passthru_cmd cmd; struct nvme_command c; unsigned timeout = 0; u32 effects; int status; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (copy_from_user(&cmd, ucmd, sizeof(cmd))) return -EFAULT; if (cmd.flags) return -EINVAL; memset(&c, 0, sizeof(c)); c.common.opcode = cmd.opcode; c.common.flags = cmd.flags; c.common.nsid = cpu_to_le32(cmd.nsid); c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); c.common.cdw10 = cpu_to_le32(cmd.cdw10); c.common.cdw11 = cpu_to_le32(cmd.cdw11); c.common.cdw12 = cpu_to_le32(cmd.cdw12); c.common.cdw13 = cpu_to_le32(cmd.cdw13); c.common.cdw14 = cpu_to_le32(cmd.cdw14); c.common.cdw15 = cpu_to_le32(cmd.cdw15); if (cmd.timeout_ms) timeout = msecs_to_jiffies(cmd.timeout_ms); effects = nvme_passthru_start(ctrl, ns, cmd.opcode); status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, (void __user *)(uintptr_t)cmd.addr, cmd.data_len, (void __user *)(uintptr_t)cmd.metadata, cmd.metadata_len, 0, &cmd.result, timeout); nvme_passthru_end(ctrl, effects); if (status >= 0) { if (put_user(cmd.result, &ucmd->result)) return -EFAULT; } return status; } /* * Issue ioctl requests on the first available path. Note that unlike normal * block layer requests we will not retry failed request on another controller. */ static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk, struct nvme_ns_head **head, int *srcu_idx) { #ifdef CONFIG_NVME_MULTIPATH if (disk->fops == &nvme_ns_head_ops) { *head = disk->private_data; *srcu_idx = srcu_read_lock(&(*head)->srcu); return nvme_find_path(*head); } #endif *head = NULL; *srcu_idx = -1; return disk->private_data; } static void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx) { if (head) srcu_read_unlock(&head->srcu, idx); } static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned cmd, unsigned long arg) { switch (cmd) { case NVME_IOCTL_ID: force_successful_syscall_return(); return ns->head->ns_id; case NVME_IOCTL_ADMIN_CMD: return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg); case NVME_IOCTL_IO_CMD: return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg); case NVME_IOCTL_SUBMIT_IO: return nvme_submit_io(ns, (void __user *)arg); default: #ifdef CONFIG_NVM if (ns->ndev) return nvme_nvm_ioctl(ns, cmd, arg); #endif if (is_sed_ioctl(cmd)) return sed_ioctl(ns->ctrl->opal_dev, cmd, (void __user *) arg); return -ENOTTY; } } static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) { struct nvme_ns_head *head = NULL; struct nvme_ns *ns; int srcu_idx, ret; ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx); if (unlikely(!ns)) ret = -EWOULDBLOCK; else ret = nvme_ns_ioctl(ns, cmd, arg); nvme_put_ns_from_disk(head, srcu_idx); return ret; } static int nvme_open(struct block_device *bdev, fmode_t mode) { struct nvme_ns *ns = bdev->bd_disk->private_data; #ifdef CONFIG_NVME_MULTIPATH /* should never be called due to GENHD_FL_HIDDEN */ if (WARN_ON_ONCE(ns->head->disk)) goto fail; #endif if (!kref_get_unless_zero(&ns->kref)) goto fail; if (!try_module_get(ns->ctrl->ops->module)) goto fail_put_ns; return 0; fail_put_ns: nvme_put_ns(ns); fail: return -ENXIO; } static void nvme_release(struct gendisk *disk, fmode_t mode) { struct nvme_ns *ns = disk->private_data; module_put(ns->ctrl->ops->module); nvme_put_ns(ns); } static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo) { /* some standard values */ geo->heads = 1 << 6; geo->sectors = 1 << 5; geo->cylinders = get_capacity(bdev->bd_disk) >> 11; return 0; } #ifdef CONFIG_BLK_DEV_INTEGRITY static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type) { struct blk_integrity integrity; memset(&integrity, 0, sizeof(integrity)); switch (pi_type) { case NVME_NS_DPS_PI_TYPE3: integrity.profile = &t10_pi_type3_crc; integrity.tag_size = sizeof(u16) + sizeof(u32); integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE; break; case NVME_NS_DPS_PI_TYPE1: case NVME_NS_DPS_PI_TYPE2: integrity.profile = &t10_pi_type1_crc; integrity.tag_size = sizeof(u16); integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE; break; default: integrity.profile = NULL; break; } integrity.tuple_size = ms; blk_integrity_register(disk, &integrity); blk_queue_max_integrity_segments(disk->queue, 1); } #else static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type) { } #endif /* CONFIG_BLK_DEV_INTEGRITY */ static void nvme_set_chunk_size(struct nvme_ns *ns) { u32 chunk_size = (((u32)ns->noiob) << (ns->lba_shift - 9)); blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size)); } static void nvme_config_discard(struct nvme_ns *ns) { struct nvme_ctrl *ctrl = ns->ctrl; struct request_queue *queue = ns->queue; u32 size = queue_logical_block_size(queue); if (!(ctrl->oncs & NVME_CTRL_ONCS_DSM)) { blk_queue_flag_clear(QUEUE_FLAG_DISCARD, queue); return; } if (ctrl->nr_streams && ns->sws && ns->sgs) size *= ns->sws * ns->sgs; BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) < NVME_DSM_MAX_RANGES); queue->limits.discard_alignment = 0; queue->limits.discard_granularity = size; /* If discard is already enabled, don't reset queue limits */ if (blk_queue_flag_test_and_set(QUEUE_FLAG_DISCARD, queue)) return; blk_queue_max_discard_sectors(queue, UINT_MAX); blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES); if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES) blk_queue_max_write_zeroes_sectors(queue, UINT_MAX); } static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid, struct nvme_id_ns *id, struct nvme_ns_ids *ids) { memset(ids, 0, sizeof(*ids)); if (ctrl->vs >= NVME_VS(1, 1, 0)) memcpy(ids->eui64, id->eui64, sizeof(id->eui64)); if (ctrl->vs >= NVME_VS(1, 2, 0)) memcpy(ids->nguid, id->nguid, sizeof(id->nguid)); if (ctrl->vs >= NVME_VS(1, 3, 0)) { /* Don't treat error as fatal we potentially * already have a NGUID or EUI-64 */ if (nvme_identify_ns_descs(ctrl, nsid, ids)) dev_warn(ctrl->device, "%s: Identify Descriptors failed\n", __func__); } } static bool nvme_ns_ids_valid(struct nvme_ns_ids *ids) { return !uuid_is_null(&ids->uuid) || memchr_inv(ids->nguid, 0, sizeof(ids->nguid)) || memchr_inv(ids->eui64, 0, sizeof(ids->eui64)); } static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b) { return uuid_equal(&a->uuid, &b->uuid) && memcmp(&a->nguid, &b->nguid, sizeof(a->nguid)) == 0 && memcmp(&a->eui64, &b->eui64, sizeof(a->eui64)) == 0; } static void nvme_update_disk_info(struct gendisk *disk, struct nvme_ns *ns, struct nvme_id_ns *id) { sector_t capacity = le64_to_cpup(&id->nsze) << (ns->lba_shift - 9); unsigned short bs = 1 << ns->lba_shift; blk_mq_freeze_queue(disk->queue); blk_integrity_unregister(disk); blk_queue_logical_block_size(disk->queue, bs); blk_queue_physical_block_size(disk->queue, bs); blk_queue_io_min(disk->queue, bs); if (ns->ms && !ns->ext && (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED)) nvme_init_integrity(disk, ns->ms, ns->pi_type); if (ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk)) capacity = 0; set_capacity(disk, capacity); nvme_config_discard(ns); if (id->nsattr & (1 << 0)) set_disk_ro(disk, true); else set_disk_ro(disk, false); blk_mq_unfreeze_queue(disk->queue); } static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id) { struct nvme_ns *ns = disk->private_data; /* * If identify namespace failed, use default 512 byte block size so * block layer can use before failing read/write for 0 capacity. */ ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds; if (ns->lba_shift == 0) ns->lba_shift = 9; ns->noiob = le16_to_cpu(id->noiob); ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms); ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT); /* the PI implementation requires metadata equal t10 pi tuple size */ if (ns->ms == sizeof(struct t10_pi_tuple)) ns->pi_type = id->dps & NVME_NS_DPS_PI_MASK; else ns->pi_type = 0; if (ns->noiob) nvme_set_chunk_size(ns); nvme_update_disk_info(disk, ns, id); #ifdef CONFIG_NVME_MULTIPATH if (ns->head->disk) { nvme_update_disk_info(ns->head->disk, ns, id); blk_queue_stack_limits(ns->head->disk->queue, ns->queue); } #endif } static int nvme_revalidate_disk(struct gendisk *disk) { struct nvme_ns *ns = disk->private_data; struct nvme_ctrl *ctrl = ns->ctrl; struct nvme_id_ns *id; struct nvme_ns_ids ids; int ret = 0; if (test_bit(NVME_NS_DEAD, &ns->flags)) { set_capacity(disk, 0); return -ENODEV; } id = nvme_identify_ns(ctrl, ns->head->ns_id); if (!id) return -ENODEV; if (id->ncap == 0) { ret = -ENODEV; goto out; } __nvme_revalidate_disk(disk, id); nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids); if (!nvme_ns_ids_equal(&ns->head->ids, &ids)) { dev_err(ctrl->device, "identifiers changed for nsid %d\n", ns->head->ns_id); ret = -ENODEV; } out: kfree(id); return ret; } static char nvme_pr_type(enum pr_type type) { switch (type) { case PR_WRITE_EXCLUSIVE: return 1; case PR_EXCLUSIVE_ACCESS: return 2; case PR_WRITE_EXCLUSIVE_REG_ONLY: return 3; case PR_EXCLUSIVE_ACCESS_REG_ONLY: return 4; case PR_WRITE_EXCLUSIVE_ALL_REGS: return 5; case PR_EXCLUSIVE_ACCESS_ALL_REGS: return 6; default: return 0; } }; static int nvme_pr_command(struct block_device *bdev, u32 cdw10, u64 key, u64 sa_key, u8 op) { struct nvme_ns_head *head = NULL; struct nvme_ns *ns; struct nvme_command c; int srcu_idx, ret; u8 data[16] = { 0, }; ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx); if (unlikely(!ns)) return -EWOULDBLOCK; put_unaligned_le64(key, &data[0]); put_unaligned_le64(sa_key, &data[8]); memset(&c, 0, sizeof(c)); c.common.opcode = op; c.common.nsid = cpu_to_le32(ns->head->ns_id); c.common.cdw10 = cpu_to_le32(cdw10); ret = nvme_submit_sync_cmd(ns->queue, &c, data, 16); nvme_put_ns_from_disk(head, srcu_idx); return ret; } static int nvme_pr_register(struct block_device *bdev, u64 old, u64 new, unsigned flags) { u32 cdw10; if (flags & ~PR_FL_IGNORE_KEY) return -EOPNOTSUPP; cdw10 = old ? 2 : 0; cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0; cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */ return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register); } static int nvme_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, unsigned flags) { u32 cdw10; if (flags & ~PR_FL_IGNORE_KEY) return -EOPNOTSUPP; cdw10 = nvme_pr_type(type) << 8; cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0); return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire); } static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new, enum pr_type type, bool abort) { u32 cdw10 = nvme_pr_type(type) << 8 | (abort ? 2 : 1); return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire); } static int nvme_pr_clear(struct block_device *bdev, u64 key) { u32 cdw10 = 1 | (key ? 1 << 3 : 0); return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register); } static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type) { u32 cdw10 = nvme_pr_type(type) << 8 | (key ? 1 << 3 : 0); return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release); } static const struct pr_ops nvme_pr_ops = { .pr_register = nvme_pr_register, .pr_reserve = nvme_pr_reserve, .pr_release = nvme_pr_release, .pr_preempt = nvme_pr_preempt, .pr_clear = nvme_pr_clear, }; #ifdef CONFIG_BLK_SED_OPAL int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len, bool send) { struct nvme_ctrl *ctrl = data; struct nvme_command cmd; memset(&cmd, 0, sizeof(cmd)); if (send) cmd.common.opcode = nvme_admin_security_send; else cmd.common.opcode = nvme_admin_security_recv; cmd.common.nsid = 0; cmd.common.cdw10 = cpu_to_le32(((u32)secp) << 24 | ((u32)spsp) << 8); cmd.common.cdw11 = cpu_to_le32(len); return __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, NULL, buffer, len, ADMIN_TIMEOUT, NVME_QID_ANY, 1, 0, false); } EXPORT_SYMBOL_GPL(nvme_sec_submit); #endif /* CONFIG_BLK_SED_OPAL */ static const struct block_device_operations nvme_fops = { .owner = THIS_MODULE, .ioctl = nvme_ioctl, .compat_ioctl = nvme_ioctl, .open = nvme_open, .release = nvme_release, .getgeo = nvme_getgeo, .revalidate_disk= nvme_revalidate_disk, .pr_ops = &nvme_pr_ops, }; #ifdef CONFIG_NVME_MULTIPATH static int nvme_ns_head_open(struct block_device *bdev, fmode_t mode) { struct nvme_ns_head *head = bdev->bd_disk->private_data; if (!kref_get_unless_zero(&head->ref)) return -ENXIO; return 0; } static void nvme_ns_head_release(struct gendisk *disk, fmode_t mode) { nvme_put_ns_head(disk->private_data); } const struct block_device_operations nvme_ns_head_ops = { .owner = THIS_MODULE, .open = nvme_ns_head_open, .release = nvme_ns_head_release, .ioctl = nvme_ioctl, .compat_ioctl = nvme_ioctl, .getgeo = nvme_getgeo, .pr_ops = &nvme_pr_ops, }; #endif /* CONFIG_NVME_MULTIPATH */ static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled) { unsigned long timeout = ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies; u32 csts, bit = enabled ? NVME_CSTS_RDY : 0; int ret; while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) { if (csts == ~0) return -ENODEV; if ((csts & NVME_CSTS_RDY) == bit) break; msleep(100); if (fatal_signal_pending(current)) return -EINTR; if (time_after(jiffies, timeout)) { dev_err(ctrl->device, "Device not ready; aborting %s\n", enabled ? "initialisation" : "reset"); return -ENODEV; } } return ret; } /* * If the device has been passed off to us in an enabled state, just clear * the enabled bit. The spec says we should set the 'shutdown notification * bits', but doing so may cause the device to complete commands to the * admin queue ... and we don't know what memory that might be pointing at! */ int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap) { int ret; ctrl->ctrl_config &= ~NVME_CC_SHN_MASK; ctrl->ctrl_config &= ~NVME_CC_ENABLE; ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); if (ret) return ret; if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY) msleep(NVME_QUIRK_DELAY_AMOUNT); return nvme_wait_ready(ctrl, cap, false); } EXPORT_SYMBOL_GPL(nvme_disable_ctrl); int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap) { /* * Default to a 4K page size, with the intention to update this * path in the future to accomodate architectures with differing * kernel and IO page sizes. */ unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12; int ret; if (page_shift < dev_page_min) { dev_err(ctrl->device, "Minimum device page size %u too large for host (%u)\n", 1 << dev_page_min, 1 << page_shift); return -ENODEV; } ctrl->page_size = 1 << page_shift; ctrl->ctrl_config = NVME_CC_CSS_NVM; ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT; ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE; ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES; ctrl->ctrl_config |= NVME_CC_ENABLE; ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); if (ret) return ret; return nvme_wait_ready(ctrl, cap, true); } EXPORT_SYMBOL_GPL(nvme_enable_ctrl); int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl) { unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ); u32 csts; int ret; ctrl->ctrl_config &= ~NVME_CC_SHN_MASK; ctrl->ctrl_config |= NVME_CC_SHN_NORMAL; ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); if (ret) return ret; while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) { if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT) break; msleep(100); if (fatal_signal_pending(current)) return -EINTR; if (time_after(jiffies, timeout)) { dev_err(ctrl->device, "Device shutdown incomplete; abort shutdown\n"); return -ENODEV; } } return ret; } EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl); static void nvme_set_queue_limits(struct nvme_ctrl *ctrl, struct request_queue *q) { bool vwc = false; if (ctrl->max_hw_sectors) { u32 max_segments = (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1; max_segments = min_not_zero(max_segments, ctrl->max_segments); blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors); blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX)); } if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && is_power_of_2(ctrl->max_hw_sectors)) blk_queue_chunk_sectors(q, ctrl->max_hw_sectors); blk_queue_virt_boundary(q, ctrl->page_size - 1); if (ctrl->vwc & NVME_CTRL_VWC_PRESENT) vwc = true; blk_queue_write_cache(q, vwc, vwc); } static int nvme_configure_timestamp(struct nvme_ctrl *ctrl) { __le64 ts; int ret; if (!(ctrl->oncs & NVME_CTRL_ONCS_TIMESTAMP)) return 0; ts = cpu_to_le64(ktime_to_ms(ktime_get_real())); ret = nvme_set_features(ctrl, NVME_FEAT_TIMESTAMP, 0, &ts, sizeof(ts), NULL); if (ret) dev_warn_once(ctrl->device, "could not set timestamp (%d)\n", ret); return ret; } static int nvme_configure_acre(struct nvme_ctrl *ctrl) { struct nvme_feat_host_behavior *host; int ret; /* Don't bother enabling the feature if retry delay is not reported */ if (!ctrl->crdt[0]) return 0; host = kzalloc(sizeof(*host), GFP_KERNEL); if (!host) return 0; host->acre = NVME_ENABLE_ACRE; ret = nvme_set_features(ctrl, NVME_FEAT_HOST_BEHAVIOR, 0, host, sizeof(*host), NULL); kfree(host); return ret; } static int nvme_configure_apst(struct nvme_ctrl *ctrl) { /* * APST (Autonomous Power State Transition) lets us program a * table of power state transitions that the controller will * perform automatically. We configure it with a simple * heuristic: we are willing to spend at most 2% of the time * transitioning between power states. Therefore, when running * in any given state, we will enter the next lower-power * non-operational state after waiting 50 * (enlat + exlat) * microseconds, as long as that state's exit latency is under * the requested maximum latency. * * We will not autonomously enter any non-operational state for * which the total latency exceeds ps_max_latency_us. Users * can set ps_max_latency_us to zero to turn off APST. */ unsigned apste; struct nvme_feat_auto_pst *table; u64 max_lat_us = 0; int max_ps = -1; int ret; /* * If APST isn't supported or if we haven't been initialized yet, * then don't do anything. */ if (!ctrl->apsta) return 0; if (ctrl->npss > 31) { dev_warn(ctrl->device, "NPSS is invalid; not using APST\n"); return 0; } table = kzalloc(sizeof(*table), GFP_KERNEL); if (!table) return 0; if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) { /* Turn off APST. */ apste = 0; dev_dbg(ctrl->device, "APST disabled\n"); } else { __le64 target = cpu_to_le64(0); int state; /* * Walk through all states from lowest- to highest-power. * According to the spec, lower-numbered states use more * power. NPSS, despite the name, is the index of the * lowest-power state, not the number of states. */ for (state = (int)ctrl->npss; state >= 0; state--) { u64 total_latency_us, exit_latency_us, transition_ms; if (target) table->entries[state] = target; /* * Don't allow transitions to the deepest state * if it's quirked off. */ if (state == ctrl->npss && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) continue; /* * Is this state a useful non-operational state for * higher-power states to autonomously transition to? */ if (!(ctrl->psd[state].flags & NVME_PS_FLAGS_NON_OP_STATE)) continue; exit_latency_us = (u64)le32_to_cpu(ctrl->psd[state].exit_lat); if (exit_latency_us > ctrl->ps_max_latency_us) continue; total_latency_us = exit_latency_us + le32_to_cpu(ctrl->psd[state].entry_lat); /* * This state is good. Use it as the APST idle * target for higher power states. */ transition_ms = total_latency_us + 19; do_div(transition_ms, 20); if (transition_ms > (1 << 24) - 1) transition_ms = (1 << 24) - 1; target = cpu_to_le64((state << 3) | (transition_ms << 8)); if (max_ps == -1) max_ps = state; if (total_latency_us > max_lat_us) max_lat_us = total_latency_us; } apste = 1; if (max_ps == -1) { dev_dbg(ctrl->device, "APST enabled but no non-operational states are available\n"); } else { dev_dbg(ctrl->device, "APST enabled: max PS = %d, max round-trip latency = %lluus, table = %*phN\n", max_ps, max_lat_us, (int)sizeof(*table), table); } } ret = nvme_set_features(ctrl, NVME_FEAT_AUTO_PST, apste, table, sizeof(*table), NULL); if (ret) dev_err(ctrl->device, "failed to set APST feature (%d)\n", ret); kfree(table); return ret; } static void nvme_set_latency_tolerance(struct device *dev, s32 val) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); u64 latency; switch (val) { case PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT: case PM_QOS_LATENCY_ANY: latency = U64_MAX; break; default: latency = val; } if (ctrl->ps_max_latency_us != latency) { ctrl->ps_max_latency_us = latency; nvme_configure_apst(ctrl); } } struct nvme_core_quirk_entry { /* * NVMe model and firmware strings are padded with spaces. For * simplicity, strings in the quirk table are padded with NULLs * instead. */ u16 vid; const char *mn; const char *fr; unsigned long quirks; }; static const struct nvme_core_quirk_entry core_quirks[] = { { /* * This Toshiba device seems to die using any APST states. See: * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1678184/comments/11 */ .vid = 0x1179, .mn = "THNSF5256GPUK TOSHIBA", .quirks = NVME_QUIRK_NO_APST, } }; /* match is null-terminated but idstr is space-padded. */ static bool string_matches(const char *idstr, const char *match, size_t len) { size_t matchlen; if (!match) return true; matchlen = strlen(match); WARN_ON_ONCE(matchlen > len); if (memcmp(idstr, match, matchlen)) return false; for (; matchlen < len; matchlen++) if (idstr[matchlen] != ' ') return false; return true; } static bool quirk_matches(const struct nvme_id_ctrl *id, const struct nvme_core_quirk_entry *q) { return q->vid == le16_to_cpu(id->vid) && string_matches(id->mn, q->mn, sizeof(id->mn)) && string_matches(id->fr, q->fr, sizeof(id->fr)); } static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) { size_t nqnlen; int off; if(!(ctrl->quirks & NVME_QUIRK_IGNORE_DEV_SUBNQN)) { nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE); if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) { strlcpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE); return; } if (ctrl->vs >= NVME_VS(1, 2, 1)) dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n"); } /* Generate a "fake" NQN per Figure 254 in NVMe 1.3 + ECN 001 */ off = snprintf(subsys->subnqn, NVMF_NQN_SIZE, "nqn.2014.08.org.nvmexpress:%04x%04x", le16_to_cpu(id->vid), le16_to_cpu(id->ssvid)); memcpy(subsys->subnqn + off, id->sn, sizeof(id->sn)); off += sizeof(id->sn); memcpy(subsys->subnqn + off, id->mn, sizeof(id->mn)); off += sizeof(id->mn); memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off); } static void __nvme_release_subsystem(struct nvme_subsystem *subsys) { ida_simple_remove(&nvme_subsystems_ida, subsys->instance); kfree(subsys); } static void nvme_release_subsystem(struct device *dev) { __nvme_release_subsystem(container_of(dev, struct nvme_subsystem, dev)); } static void nvme_destroy_subsystem(struct kref *ref) { struct nvme_subsystem *subsys = container_of(ref, struct nvme_subsystem, ref); mutex_lock(&nvme_subsystems_lock); list_del(&subsys->entry); mutex_unlock(&nvme_subsystems_lock); ida_destroy(&subsys->ns_ida); device_del(&subsys->dev); put_device(&subsys->dev); } static void nvme_put_subsystem(struct nvme_subsystem *subsys) { kref_put(&subsys->ref, nvme_destroy_subsystem); } static struct nvme_subsystem *__nvme_find_get_subsystem(const char *subsysnqn) { struct nvme_subsystem *subsys; lockdep_assert_held(&nvme_subsystems_lock); list_for_each_entry(subsys, &nvme_subsystems, entry) { if (strcmp(subsys->subnqn, subsysnqn)) continue; if (!kref_get_unless_zero(&subsys->ref)) continue; return subsys; } return NULL; } #define SUBSYS_ATTR_RO(_name, _mode, _show) \ struct device_attribute subsys_attr_##_name = \ __ATTR(_name, _mode, _show, NULL) static ssize_t nvme_subsys_show_nqn(struct device *dev, struct device_attribute *attr, char *buf) { struct nvme_subsystem *subsys = container_of(dev, struct nvme_subsystem, dev); return snprintf(buf, PAGE_SIZE, "%s\n", subsys->subnqn); } static SUBSYS_ATTR_RO(subsysnqn, S_IRUGO, nvme_subsys_show_nqn); #define nvme_subsys_show_str_function(field) \ static ssize_t subsys_##field##_show(struct device *dev, \ struct device_attribute *attr, char *buf) \ { \ struct nvme_subsystem *subsys = \ container_of(dev, struct nvme_subsystem, dev); \ return sprintf(buf, "%.*s\n", \ (int)sizeof(subsys->field), subsys->field); \ } \ static SUBSYS_ATTR_RO(field, S_IRUGO, subsys_##field##_show); nvme_subsys_show_str_function(model); nvme_subsys_show_str_function(serial); nvme_subsys_show_str_function(firmware_rev); static struct attribute *nvme_subsys_attrs[] = { &subsys_attr_model.attr, &subsys_attr_serial.attr, &subsys_attr_firmware_rev.attr, &subsys_attr_subsysnqn.attr, NULL, }; static struct attribute_group nvme_subsys_attrs_group = { .attrs = nvme_subsys_attrs, }; static const struct attribute_group *nvme_subsys_attrs_groups[] = { &nvme_subsys_attrs_group, NULL, }; static int nvme_active_ctrls(struct nvme_subsystem *subsys) { int count = 0; struct nvme_ctrl *ctrl; mutex_lock(&subsys->lock); list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) { if (ctrl->state != NVME_CTRL_DELETING && ctrl->state != NVME_CTRL_DEAD) count++; } mutex_unlock(&subsys->lock); return count; } static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) { struct nvme_subsystem *subsys, *found; int ret; subsys = kzalloc(sizeof(*subsys), GFP_KERNEL); if (!subsys) return -ENOMEM; ret = ida_simple_get(&nvme_subsystems_ida, 0, 0, GFP_KERNEL); if (ret < 0) { kfree(subsys); return ret; } subsys->instance = ret; mutex_init(&subsys->lock); kref_init(&subsys->ref); INIT_LIST_HEAD(&subsys->ctrls); INIT_LIST_HEAD(&subsys->nsheads); nvme_init_subnqn(subsys, ctrl, id); memcpy(subsys->serial, id->sn, sizeof(subsys->serial)); memcpy(subsys->model, id->mn, sizeof(subsys->model)); memcpy(subsys->firmware_rev, id->fr, sizeof(subsys->firmware_rev)); subsys->vendor_id = le16_to_cpu(id->vid); subsys->cmic = id->cmic; subsys->dev.class = nvme_subsys_class; subsys->dev.release = nvme_release_subsystem; subsys->dev.groups = nvme_subsys_attrs_groups; dev_set_name(&subsys->dev, "nvme-subsys%d", subsys->instance); device_initialize(&subsys->dev); mutex_lock(&nvme_subsystems_lock); found = __nvme_find_get_subsystem(subsys->subnqn); if (found) { /* * Verify that the subsystem actually supports multiple * controllers, else bail out. */ if (!(ctrl->opts && ctrl->opts->discovery_nqn) && nvme_active_ctrls(found) && !(id->cmic & (1 << 1))) { dev_err(ctrl->device, "ignoring ctrl due to duplicate subnqn (%s).\n", found->subnqn); nvme_put_subsystem(found); ret = -EINVAL; goto out_unlock; } __nvme_release_subsystem(subsys); subsys = found; } else { ret = device_add(&subsys->dev); if (ret) { dev_err(ctrl->device, "failed to register subsystem device.\n"); goto out_unlock; } ida_init(&subsys->ns_ida); list_add_tail(&subsys->entry, &nvme_subsystems); } ctrl->subsys = subsys; mutex_unlock(&nvme_subsystems_lock); if (sysfs_create_link(&subsys->dev.kobj, &ctrl->device->kobj, dev_name(ctrl->device))) { dev_err(ctrl->device, "failed to create sysfs link from subsystem.\n"); /* the transport driver will eventually put the subsystem */ return -EINVAL; } mutex_lock(&subsys->lock); list_add_tail(&ctrl->subsys_entry, &subsys->ctrls); mutex_unlock(&subsys->lock); return 0; out_unlock: mutex_unlock(&nvme_subsystems_lock); put_device(&subsys->dev); return ret; } int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, void *log, size_t size, u64 offset) { struct nvme_command c = { }; unsigned long dwlen = size / 4 - 1; c.get_log_page.opcode = nvme_admin_get_log_page; c.get_log_page.nsid = cpu_to_le32(nsid); c.get_log_page.lid = log_page; c.get_log_page.lsp = lsp; c.get_log_page.numdl = cpu_to_le16(dwlen & ((1 << 16) - 1)); c.get_log_page.numdu = cpu_to_le16(dwlen >> 16); c.get_log_page.lpol = cpu_to_le32(lower_32_bits(offset)); c.get_log_page.lpou = cpu_to_le32(upper_32_bits(offset)); return nvme_submit_sync_cmd(ctrl->admin_q, &c, log, size); } static int nvme_get_effects_log(struct nvme_ctrl *ctrl) { int ret; if (!ctrl->effects) ctrl->effects = kzalloc(sizeof(*ctrl->effects), GFP_KERNEL); if (!ctrl->effects) return 0; ret = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CMD_EFFECTS, 0, ctrl->effects, sizeof(*ctrl->effects), 0); if (ret) { kfree(ctrl->effects); ctrl->effects = NULL; } return ret; } /* * Initialize the cached copies of the Identify data and various controller * register in our nvme_ctrl structure. This should be called as soon as * the admin queue is fully up and running. */ int nvme_init_identify(struct nvme_ctrl *ctrl) { struct nvme_id_ctrl *id; u64 cap; int ret, page_shift; u32 max_hw_sectors; bool prev_apst_enabled; ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs); if (ret) { dev_err(ctrl->device, "Reading VS failed (%d)\n", ret); return ret; } ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap); if (ret) { dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret); return ret; } page_shift = NVME_CAP_MPSMIN(cap) + 12; if (ctrl->vs >= NVME_VS(1, 1, 0)) ctrl->subsystem = NVME_CAP_NSSRC(cap); ret = nvme_identify_ctrl(ctrl, &id); if (ret) { dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret); return -EIO; } if (id->lpa & NVME_CTRL_LPA_CMD_EFFECTS_LOG) { ret = nvme_get_effects_log(ctrl); if (ret < 0) goto out_free; } if (!ctrl->identified) { int i; ret = nvme_init_subsystem(ctrl, id); if (ret) goto out_free; /* * Check for quirks. Quirk can depend on firmware version, * so, in principle, the set of quirks present can change * across a reset. As a possible future enhancement, we * could re-scan for quirks every time we reinitialize * the device, but we'd have to make sure that the driver * behaves intelligently if the quirks change. */ for (i = 0; i < ARRAY_SIZE(core_quirks); i++) { if (quirk_matches(id, &core_quirks[i])) ctrl->quirks |= core_quirks[i].quirks; } } if (force_apst && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) { dev_warn(ctrl->device, "forcibly allowing all power states due to nvme_core.force_apst -- use at your own risk\n"); ctrl->quirks &= ~NVME_QUIRK_NO_DEEPEST_PS; } ctrl->crdt[0] = le16_to_cpu(id->crdt1); ctrl->crdt[1] = le16_to_cpu(id->crdt2); ctrl->crdt[2] = le16_to_cpu(id->crdt3); ctrl->oacs = le16_to_cpu(id->oacs); ctrl->oncs = le16_to_cpup(&id->oncs); ctrl->oaes = le32_to_cpu(id->oaes); atomic_set(&ctrl->abort_limit, id->acl + 1); ctrl->vwc = id->vwc; if (id->mdts) max_hw_sectors = 1 << (id->mdts + page_shift - 9); else max_hw_sectors = UINT_MAX; ctrl->max_hw_sectors = min_not_zero(ctrl->max_hw_sectors, max_hw_sectors); nvme_set_queue_limits(ctrl, ctrl->admin_q); ctrl->sgls = le32_to_cpu(id->sgls); ctrl->kas = le16_to_cpu(id->kas); ctrl->max_namespaces = le32_to_cpu(id->mnan); ctrl->ctratt = le32_to_cpu(id->ctratt); if (id->rtd3e) { /* us -> s */ u32 transition_time = le32_to_cpu(id->rtd3e) / 1000000; ctrl->shutdown_timeout = clamp_t(unsigned int, transition_time, shutdown_timeout, 60); if (ctrl->shutdown_timeout != shutdown_timeout) dev_info(ctrl->device, "Shutdown timeout set to %u seconds\n", ctrl->shutdown_timeout); } else ctrl->shutdown_timeout = shutdown_timeout; ctrl->npss = id->npss; ctrl->apsta = id->apsta; prev_apst_enabled = ctrl->apst_enabled; if (ctrl->quirks & NVME_QUIRK_NO_APST) { if (force_apst && id->apsta) { dev_warn(ctrl->device, "forcibly allowing APST due to nvme_core.force_apst -- use at your own risk\n"); ctrl->apst_enabled = true; } else { ctrl->apst_enabled = false; } } else { ctrl->apst_enabled = id->apsta; } memcpy(ctrl->psd, id->psd, sizeof(ctrl->psd)); if (ctrl->ops->flags & NVME_F_FABRICS) { ctrl->icdoff = le16_to_cpu(id->icdoff); ctrl->ioccsz = le32_to_cpu(id->ioccsz); ctrl->iorcsz = le32_to_cpu(id->iorcsz); ctrl->maxcmd = le16_to_cpu(id->maxcmd); /* * In fabrics we need to verify the cntlid matches the * admin connect */ if (ctrl->cntlid != le16_to_cpu(id->cntlid)) { ret = -EINVAL; goto out_free; } if (!ctrl->opts->discovery_nqn && !ctrl->kas) { dev_err(ctrl->device, "keep-alive support is mandatory for fabrics\n"); ret = -EINVAL; goto out_free; } } else { ctrl->cntlid = le16_to_cpu(id->cntlid); ctrl->hmpre = le32_to_cpu(id->hmpre); ctrl->hmmin = le32_to_cpu(id->hmmin); ctrl->hmminds = le32_to_cpu(id->hmminds); ctrl->hmmaxd = le16_to_cpu(id->hmmaxd); } ret = nvme_mpath_init(ctrl, id); kfree(id); if (ret < 0) return ret; if (ctrl->apst_enabled && !prev_apst_enabled) dev_pm_qos_expose_latency_tolerance(ctrl->device); else if (!ctrl->apst_enabled && prev_apst_enabled) dev_pm_qos_hide_latency_tolerance(ctrl->device); ret = nvme_configure_apst(ctrl); if (ret < 0) return ret; ret = nvme_configure_timestamp(ctrl); if (ret < 0) return ret; ret = nvme_configure_directives(ctrl); if (ret < 0) return ret; ret = nvme_configure_acre(ctrl); if (ret < 0) return ret; ctrl->identified = true; return 0; out_free: kfree(id); return ret; } EXPORT_SYMBOL_GPL(nvme_init_identify); static int nvme_dev_open(struct inode *inode, struct file *file) { struct nvme_ctrl *ctrl = container_of(inode->i_cdev, struct nvme_ctrl, cdev); switch (ctrl->state) { case NVME_CTRL_LIVE: case NVME_CTRL_ADMIN_ONLY: break; default: return -EWOULDBLOCK; } file->private_data = ctrl; return 0; } static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp) { struct nvme_ns *ns; int ret; down_read(&ctrl->namespaces_rwsem); if (list_empty(&ctrl->namespaces)) { ret = -ENOTTY; goto out_unlock; } ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list); if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) { dev_warn(ctrl->device, "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n"); ret = -EINVAL; goto out_unlock; } dev_warn(ctrl->device, "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n"); kref_get(&ns->kref); up_read(&ctrl->namespaces_rwsem); ret = nvme_user_cmd(ctrl, ns, argp); nvme_put_ns(ns); return ret; out_unlock: up_read(&ctrl->namespaces_rwsem); return ret; } static long nvme_dev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct nvme_ctrl *ctrl = file->private_data; void __user *argp = (void __user *)arg; switch (cmd) { case NVME_IOCTL_ADMIN_CMD: return nvme_user_cmd(ctrl, NULL, argp); case NVME_IOCTL_IO_CMD: return nvme_dev_user_cmd(ctrl, argp); case NVME_IOCTL_RESET: dev_warn(ctrl->device, "resetting controller\n"); return nvme_reset_ctrl_sync(ctrl); case NVME_IOCTL_SUBSYS_RESET: return nvme_reset_subsystem(ctrl); case NVME_IOCTL_RESCAN: nvme_queue_scan(ctrl); return 0; default: return -ENOTTY; } } static const struct file_operations nvme_dev_fops = { .owner = THIS_MODULE, .open = nvme_dev_open, .unlocked_ioctl = nvme_dev_ioctl, .compat_ioctl = nvme_dev_ioctl, }; static ssize_t nvme_sysfs_reset(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); int ret; ret = nvme_reset_ctrl_sync(ctrl); if (ret < 0) return ret; return count; } static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset); static ssize_t nvme_sysfs_rescan(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); nvme_queue_scan(ctrl); return count; } static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan); static inline struct nvme_ns_head *dev_to_ns_head(struct device *dev) { struct gendisk *disk = dev_to_disk(dev); if (disk->fops == &nvme_fops) return nvme_get_ns_from_dev(dev)->head; else return disk->private_data; } static ssize_t wwid_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nvme_ns_head *head = dev_to_ns_head(dev); struct nvme_ns_ids *ids = &head->ids; struct nvme_subsystem *subsys = head->subsys; int serial_len = sizeof(subsys->serial); int model_len = sizeof(subsys->model); if (!uuid_is_null(&ids->uuid)) return sprintf(buf, "uuid.%pU\n", &ids->uuid); if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) return sprintf(buf, "eui.%16phN\n", ids->nguid); if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64))) return sprintf(buf, "eui.%8phN\n", ids->eui64); while (serial_len > 0 && (subsys->serial[serial_len - 1] == ' ' || subsys->serial[serial_len - 1] == '\0')) serial_len--; while (model_len > 0 && (subsys->model[model_len - 1] == ' ' || subsys->model[model_len - 1] == '\0')) model_len--; return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", subsys->vendor_id, serial_len, subsys->serial, model_len, subsys->model, head->ns_id); } static DEVICE_ATTR_RO(wwid); static ssize_t nguid_show(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "%pU\n", dev_to_ns_head(dev)->ids.nguid); } static DEVICE_ATTR_RO(nguid); static ssize_t uuid_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids; /* For backward compatibility expose the NGUID to userspace if * we have no UUID set */ if (uuid_is_null(&ids->uuid)) { printk_ratelimited(KERN_WARNING "No UUID available providing old NGUID\n"); return sprintf(buf, "%pU\n", ids->nguid); } return sprintf(buf, "%pU\n", &ids->uuid); } static DEVICE_ATTR_RO(uuid); static ssize_t eui_show(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "%8ph\n", dev_to_ns_head(dev)->ids.eui64); } static DEVICE_ATTR_RO(eui); static ssize_t nsid_show(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "%d\n", dev_to_ns_head(dev)->ns_id); } static DEVICE_ATTR_RO(nsid); static struct attribute *nvme_ns_id_attrs[] = { &dev_attr_wwid.attr, &dev_attr_uuid.attr, &dev_attr_nguid.attr, &dev_attr_eui.attr, &dev_attr_nsid.attr, #ifdef CONFIG_NVME_MULTIPATH &dev_attr_ana_grpid.attr, &dev_attr_ana_state.attr, #endif NULL, }; static umode_t nvme_ns_id_attrs_are_visible(struct kobject *kobj, struct attribute *a, int n) { struct device *dev = container_of(kobj, struct device, kobj); struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids; if (a == &dev_attr_uuid.attr) { if (uuid_is_null(&ids->uuid) && !memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) return 0; } if (a == &dev_attr_nguid.attr) { if (!memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) return 0; } if (a == &dev_attr_eui.attr) { if (!memchr_inv(ids->eui64, 0, sizeof(ids->eui64))) return 0; } #ifdef CONFIG_NVME_MULTIPATH if (a == &dev_attr_ana_grpid.attr || a == &dev_attr_ana_state.attr) { if (dev_to_disk(dev)->fops != &nvme_fops) /* per-path attr */ return 0; if (!nvme_ctrl_use_ana(nvme_get_ns_from_dev(dev)->ctrl)) return 0; } #endif return a->mode; } static const struct attribute_group nvme_ns_id_attr_group = { .attrs = nvme_ns_id_attrs, .is_visible = nvme_ns_id_attrs_are_visible, }; const struct attribute_group *nvme_ns_id_attr_groups[] = { &nvme_ns_id_attr_group, #ifdef CONFIG_NVM &nvme_nvm_attr_group, #endif NULL, }; #define nvme_show_str_function(field) \ static ssize_t field##_show(struct device *dev, \ struct device_attribute *attr, char *buf) \ { \ struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \ return sprintf(buf, "%.*s\n", \ (int)sizeof(ctrl->subsys->field), ctrl->subsys->field); \ } \ static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL); nvme_show_str_function(model); nvme_show_str_function(serial); nvme_show_str_function(firmware_rev); #define nvme_show_int_function(field) \ static ssize_t field##_show(struct device *dev, \ struct device_attribute *attr, char *buf) \ { \ struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \ return sprintf(buf, "%d\n", ctrl->field); \ } \ static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL); nvme_show_int_function(cntlid); nvme_show_int_function(numa_node); static ssize_t nvme_sysfs_delete(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); if (device_remove_file_self(dev, attr)) nvme_delete_ctrl_sync(ctrl); return count; } static DEVICE_ATTR(delete_controller, S_IWUSR, NULL, nvme_sysfs_delete); static ssize_t nvme_sysfs_show_transport(struct device *dev, struct device_attribute *attr, char *buf) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->ops->name); } static DEVICE_ATTR(transport, S_IRUGO, nvme_sysfs_show_transport, NULL); static ssize_t nvme_sysfs_show_state(struct device *dev, struct device_attribute *attr, char *buf) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); static const char *const state_name[] = { [NVME_CTRL_NEW] = "new", [NVME_CTRL_LIVE] = "live", [NVME_CTRL_ADMIN_ONLY] = "only-admin", [NVME_CTRL_RESETTING] = "resetting", [NVME_CTRL_CONNECTING] = "connecting", [NVME_CTRL_DELETING] = "deleting", [NVME_CTRL_DEAD] = "dead", }; if ((unsigned)ctrl->state < ARRAY_SIZE(state_name) && state_name[ctrl->state]) return sprintf(buf, "%s\n", state_name[ctrl->state]); return sprintf(buf, "unknown state\n"); } static DEVICE_ATTR(state, S_IRUGO, nvme_sysfs_show_state, NULL); static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev, struct device_attribute *attr, char *buf) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subsys->subnqn); } static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL); static ssize_t nvme_sysfs_show_address(struct device *dev, struct device_attribute *attr, char *buf) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); return ctrl->ops->get_address(ctrl, buf, PAGE_SIZE); } static DEVICE_ATTR(address, S_IRUGO, nvme_sysfs_show_address, NULL); static struct attribute *nvme_dev_attrs[] = { &dev_attr_reset_controller.attr, &dev_attr_rescan_controller.attr, &dev_attr_model.attr, &dev_attr_serial.attr, &dev_attr_firmware_rev.attr, &dev_attr_cntlid.attr, &dev_attr_delete_controller.attr, &dev_attr_transport.attr, &dev_attr_subsysnqn.attr, &dev_attr_address.attr, &dev_attr_state.attr, &dev_attr_numa_node.attr, NULL }; static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj, struct attribute *a, int n) { struct device *dev = container_of(kobj, struct device, kobj); struct nvme_ctrl *ctrl = dev_get_drvdata(dev); if (a == &dev_attr_delete_controller.attr && !ctrl->ops->delete_ctrl) return 0; if (a == &dev_attr_address.attr && !ctrl->ops->get_address) return 0; return a->mode; } static struct attribute_group nvme_dev_attrs_group = { .attrs = nvme_dev_attrs, .is_visible = nvme_dev_attrs_are_visible, }; static const struct attribute_group *nvme_dev_attr_groups[] = { &nvme_dev_attrs_group, NULL, }; static struct nvme_ns_head *__nvme_find_ns_head(struct nvme_subsystem *subsys, unsigned nsid) { struct nvme_ns_head *h; lockdep_assert_held(&subsys->lock); list_for_each_entry(h, &subsys->nsheads, entry) { if (h->ns_id == nsid && kref_get_unless_zero(&h->ref)) return h; } return NULL; } static int __nvme_check_ids(struct nvme_subsystem *subsys, struct nvme_ns_head *new) { struct nvme_ns_head *h; lockdep_assert_held(&subsys->lock); list_for_each_entry(h, &subsys->nsheads, entry) { if (nvme_ns_ids_valid(&new->ids) && !list_empty(&h->list) && nvme_ns_ids_equal(&new->ids, &h->ids)) return -EINVAL; } return 0; } static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl, unsigned nsid, struct nvme_id_ns *id) { struct nvme_ns_head *head; size_t size = sizeof(*head); int ret = -ENOMEM; #ifdef CONFIG_NVME_MULTIPATH size += num_possible_nodes() * sizeof(struct nvme_ns *); #endif head = kzalloc(size, GFP_KERNEL); if (!head) goto out; ret = ida_simple_get(&ctrl->subsys->ns_ida, 1, 0, GFP_KERNEL); if (ret < 0) goto out_free_head; head->instance = ret; INIT_LIST_HEAD(&head->list); ret = init_srcu_struct(&head->srcu); if (ret) goto out_ida_remove; head->subsys = ctrl->subsys; head->ns_id = nsid; kref_init(&head->ref); nvme_report_ns_ids(ctrl, nsid, id, &head->ids); ret = __nvme_check_ids(ctrl->subsys, head); if (ret) { dev_err(ctrl->device, "duplicate IDs for nsid %d\n", nsid); goto out_cleanup_srcu; } ret = nvme_mpath_alloc_disk(ctrl, head); if (ret) goto out_cleanup_srcu; list_add_tail(&head->entry, &ctrl->subsys->nsheads); kref_get(&ctrl->subsys->ref); return head; out_cleanup_srcu: cleanup_srcu_struct(&head->srcu); out_ida_remove: ida_simple_remove(&ctrl->subsys->ns_ida, head->instance); out_free_head: kfree(head); out: return ERR_PTR(ret); } static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid, struct nvme_id_ns *id) { struct nvme_ctrl *ctrl = ns->ctrl; bool is_shared = id->nmic & (1 << 0); struct nvme_ns_head *head = NULL; int ret = 0; mutex_lock(&ctrl->subsys->lock); if (is_shared) head = __nvme_find_ns_head(ctrl->subsys, nsid); if (!head) { head = nvme_alloc_ns_head(ctrl, nsid, id); if (IS_ERR(head)) { ret = PTR_ERR(head); goto out_unlock; } } else { struct nvme_ns_ids ids; nvme_report_ns_ids(ctrl, nsid, id, &ids); if (!nvme_ns_ids_equal(&head->ids, &ids)) { dev_err(ctrl->device, "IDs don't match for shared namespace %d\n", nsid); ret = -EINVAL; goto out_unlock; } } list_add_tail(&ns->siblings, &head->list); ns->head = head; out_unlock: mutex_unlock(&ctrl->subsys->lock); return ret; } static int ns_cmp(void *priv, struct list_head *a, struct list_head *b) { struct nvme_ns *nsa = container_of(a, struct nvme_ns, list); struct nvme_ns *nsb = container_of(b, struct nvme_ns, list); return nsa->head->ns_id - nsb->head->ns_id; } static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid) { struct nvme_ns *ns, *ret = NULL; down_read(&ctrl->namespaces_rwsem); list_for_each_entry(ns, &ctrl->namespaces, list) { if (ns->head->ns_id == nsid) { if (!kref_get_unless_zero(&ns->kref)) continue; ret = ns; break; } if (ns->head->ns_id > nsid) break; } up_read(&ctrl->namespaces_rwsem); return ret; } static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns) { struct streams_directive_params s; int ret; if (!ctrl->nr_streams) return 0; ret = nvme_get_stream_params(ctrl, &s, ns->head->ns_id); if (ret) return ret; ns->sws = le32_to_cpu(s.sws); ns->sgs = le16_to_cpu(s.sgs); if (ns->sws) { unsigned int bs = 1 << ns->lba_shift; blk_queue_io_min(ns->queue, bs * ns->sws); if (ns->sgs) blk_queue_io_opt(ns->queue, bs * ns->sws * ns->sgs); } return 0; } static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) { struct nvme_ns *ns; struct gendisk *disk; struct nvme_id_ns *id; char disk_name[DISK_NAME_LEN]; int node = ctrl->numa_node, flags = GENHD_FL_EXT_DEVT; ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node); if (!ns) return; ns->queue = blk_mq_init_queue(ctrl->tagset); if (IS_ERR(ns->queue)) goto out_free_ns; blk_queue_flag_set(QUEUE_FLAG_NONROT, ns->queue); if (ctrl->ops->flags & NVME_F_PCI_P2PDMA) blk_queue_flag_set(QUEUE_FLAG_PCI_P2PDMA, ns->queue); ns->queue->queuedata = ns; ns->ctrl = ctrl; kref_init(&ns->kref); ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */ blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift); nvme_set_queue_limits(ctrl, ns->queue); id = nvme_identify_ns(ctrl, nsid); if (!id) goto out_free_queue; if (id->ncap == 0) goto out_free_id; if (nvme_init_ns_head(ns, nsid, id)) goto out_free_id; nvme_setup_streams_ns(ctrl, ns); nvme_set_disk_name(disk_name, ns, ctrl, &flags); disk = alloc_disk_node(0, node); if (!disk) goto out_unlink_ns; disk->fops = &nvme_fops; disk->private_data = ns; disk->queue = ns->queue; disk->flags = flags; memcpy(disk->disk_name, disk_name, DISK_NAME_LEN); ns->disk = disk; __nvme_revalidate_disk(disk, id); if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) { if (nvme_nvm_register(ns, disk_name, node)) { dev_warn(ctrl->device, "LightNVM init failure\n"); goto out_put_disk; } } down_write(&ctrl->namespaces_rwsem); list_add_tail(&ns->list, &ctrl->namespaces); up_write(&ctrl->namespaces_rwsem); nvme_get_ctrl(ctrl); device_add_disk(ctrl->device, ns->disk, nvme_ns_id_attr_groups); nvme_mpath_add_disk(ns, id); nvme_fault_inject_init(ns); kfree(id); return; out_put_disk: put_disk(ns->disk); out_unlink_ns: mutex_lock(&ctrl->subsys->lock); list_del_rcu(&ns->siblings); mutex_unlock(&ctrl->subsys->lock); out_free_id: kfree(id); out_free_queue: blk_cleanup_queue(ns->queue); out_free_ns: kfree(ns); } static void nvme_ns_remove(struct nvme_ns *ns) { if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags)) return; nvme_fault_inject_fini(ns); if (ns->disk && ns->disk->flags & GENHD_FL_UP) { del_gendisk(ns->disk); blk_cleanup_queue(ns->queue); if (blk_get_integrity(ns->disk)) blk_integrity_unregister(ns->disk); } mutex_lock(&ns->ctrl->subsys->lock); list_del_rcu(&ns->siblings); nvme_mpath_clear_current_path(ns); mutex_unlock(&ns->ctrl->subsys->lock); down_write(&ns->ctrl->namespaces_rwsem); list_del_init(&ns->list); up_write(&ns->ctrl->namespaces_rwsem); synchronize_srcu(&ns->head->srcu); nvme_mpath_check_last_path(ns); nvme_put_ns(ns); } static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid) { struct nvme_ns *ns; ns = nvme_find_get_ns(ctrl, nsid); if (ns) { if (ns->disk && revalidate_disk(ns->disk)) nvme_ns_remove(ns); nvme_put_ns(ns); } else nvme_alloc_ns(ctrl, nsid); } static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl, unsigned nsid) { struct nvme_ns *ns, *next; LIST_HEAD(rm_list); down_write(&ctrl->namespaces_rwsem); list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) { if (ns->head->ns_id > nsid || test_bit(NVME_NS_DEAD, &ns->flags)) list_move_tail(&ns->list, &rm_list); } up_write(&ctrl->namespaces_rwsem); list_for_each_entry_safe(ns, next, &rm_list, list) nvme_ns_remove(ns); } static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn) { struct nvme_ns *ns; __le32 *ns_list; unsigned i, j, nsid, prev = 0, num_lists = DIV_ROUND_UP(nn, 1024); int ret = 0; ns_list = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL); if (!ns_list) return -ENOMEM; for (i = 0; i < num_lists; i++) { ret = nvme_identify_ns_list(ctrl, prev, ns_list); if (ret) goto free; for (j = 0; j < min(nn, 1024U); j++) { nsid = le32_to_cpu(ns_list[j]); if (!nsid) goto out; nvme_validate_ns(ctrl, nsid); while (++prev < nsid) { ns = nvme_find_get_ns(ctrl, prev); if (ns) { nvme_ns_remove(ns); nvme_put_ns(ns); } } } nn -= j; } out: nvme_remove_invalid_namespaces(ctrl, prev); free: kfree(ns_list); return ret; } static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn) { unsigned i; for (i = 1; i <= nn; i++) nvme_validate_ns(ctrl, i); nvme_remove_invalid_namespaces(ctrl, nn); } static void nvme_clear_changed_ns_log(struct nvme_ctrl *ctrl) { size_t log_size = NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32); __le32 *log; int error; log = kzalloc(log_size, GFP_KERNEL); if (!log) return; /* * We need to read the log to clear the AEN, but we don't want to rely * on it for the changed namespace information as userspace could have * raced with us in reading the log page, which could cause us to miss * updates. */ error = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CHANGED_NS, 0, log, log_size, 0); if (error) dev_warn(ctrl->device, "reading changed ns log failed: %d\n", error); kfree(log); } static void nvme_scan_work(struct work_struct *work) { struct nvme_ctrl *ctrl = container_of(work, struct nvme_ctrl, scan_work); struct nvme_id_ctrl *id; unsigned nn; if (ctrl->state != NVME_CTRL_LIVE) return; WARN_ON_ONCE(!ctrl->tagset); if (test_and_clear_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events)) { dev_info(ctrl->device, "rescanning namespaces.\n"); nvme_clear_changed_ns_log(ctrl); } if (nvme_identify_ctrl(ctrl, &id)) return; mutex_lock(&ctrl->scan_lock); nn = le32_to_cpu(id->nn); if (ctrl->vs >= NVME_VS(1, 1, 0) && !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) { if (!nvme_scan_ns_list(ctrl, nn)) goto out_free_id; } nvme_scan_ns_sequential(ctrl, nn); out_free_id: mutex_unlock(&ctrl->scan_lock); kfree(id); down_write(&ctrl->namespaces_rwsem); list_sort(NULL, &ctrl->namespaces, ns_cmp); up_write(&ctrl->namespaces_rwsem); } /* * This function iterates the namespace list unlocked to allow recovery from * controller failure. It is up to the caller to ensure the namespace list is * not modified by scan work while this function is executing. */ void nvme_remove_namespaces(struct nvme_ctrl *ctrl) { struct nvme_ns *ns, *next; LIST_HEAD(ns_list); /* prevent racing with ns scanning */ flush_work(&ctrl->scan_work); /* * The dead states indicates the controller was not gracefully * disconnected. In that case, we won't be able to flush any data while * removing the namespaces' disks; fail all the queues now to avoid * potentially having to clean up the failed sync later. */ if (ctrl->state == NVME_CTRL_DEAD) nvme_kill_queues(ctrl); down_write(&ctrl->namespaces_rwsem); list_splice_init(&ctrl->namespaces, &ns_list); up_write(&ctrl->namespaces_rwsem); list_for_each_entry_safe(ns, next, &ns_list, list) nvme_ns_remove(ns); } EXPORT_SYMBOL_GPL(nvme_remove_namespaces); static void nvme_aen_uevent(struct nvme_ctrl *ctrl) { char *envp[2] = { NULL, NULL }; u32 aen_result = ctrl->aen_result; ctrl->aen_result = 0; if (!aen_result) return; envp[0] = kasprintf(GFP_KERNEL, "NVME_AEN=%#08x", aen_result); if (!envp[0]) return; kobject_uevent_env(&ctrl->device->kobj, KOBJ_CHANGE, envp); kfree(envp[0]); } static void nvme_async_event_work(struct work_struct *work) { struct nvme_ctrl *ctrl = container_of(work, struct nvme_ctrl, async_event_work); nvme_aen_uevent(ctrl); ctrl->ops->submit_async_event(ctrl); } static bool nvme_ctrl_pp_status(struct nvme_ctrl *ctrl) { u32 csts; if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) return false; if (csts == ~0) return false; return ((ctrl->ctrl_config & NVME_CC_ENABLE) && (csts & NVME_CSTS_PP)); } static void nvme_get_fw_slot_info(struct nvme_ctrl *ctrl) { struct nvme_fw_slot_info_log *log; log = kmalloc(sizeof(*log), GFP_KERNEL); if (!log) return; if (nvme_get_log(ctrl, NVME_NSID_ALL, 0, NVME_LOG_FW_SLOT, log, sizeof(*log), 0)) dev_warn(ctrl->device, "Get FW SLOT INFO log error\n"); kfree(log); } static void nvme_fw_act_work(struct work_struct *work) { struct nvme_ctrl *ctrl = container_of(work, struct nvme_ctrl, fw_act_work); unsigned long fw_act_timeout; if (ctrl->mtfa) fw_act_timeout = jiffies + msecs_to_jiffies(ctrl->mtfa * 100); else fw_act_timeout = jiffies + msecs_to_jiffies(admin_timeout * 1000); nvme_stop_queues(ctrl); while (nvme_ctrl_pp_status(ctrl)) { if (time_after(jiffies, fw_act_timeout)) { dev_warn(ctrl->device, "Fw activation timeout, reset controller\n"); nvme_reset_ctrl(ctrl); break; } msleep(100); } if (ctrl->state != NVME_CTRL_LIVE) return; nvme_start_queues(ctrl); /* read FW slot information to clear the AER */ nvme_get_fw_slot_info(ctrl); } static void nvme_handle_aen_notice(struct nvme_ctrl *ctrl, u32 result) { u32 aer_notice_type = (result & 0xff00) >> 8; switch (aer_notice_type) { case NVME_AER_NOTICE_NS_CHANGED: trace_nvme_async_event(ctrl, aer_notice_type); set_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events); nvme_queue_scan(ctrl); break; case NVME_AER_NOTICE_FW_ACT_STARTING: trace_nvme_async_event(ctrl, aer_notice_type); queue_work(nvme_wq, &ctrl->fw_act_work); break; #ifdef CONFIG_NVME_MULTIPATH case NVME_AER_NOTICE_ANA: trace_nvme_async_event(ctrl, aer_notice_type); if (!ctrl->ana_log_buf) break; queue_work(nvme_wq, &ctrl->ana_work); break; #endif default: dev_warn(ctrl->device, "async event result %08x\n", result); } } void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status, volatile union nvme_result *res) { u32 result = le32_to_cpu(res->u32); u32 aer_type = result & 0x07; if (le16_to_cpu(status) >> 1 != NVME_SC_SUCCESS) return; switch (aer_type) { case NVME_AER_NOTICE: nvme_handle_aen_notice(ctrl, result); break; case NVME_AER_ERROR: case NVME_AER_SMART: case NVME_AER_CSS: case NVME_AER_VS: trace_nvme_async_event(ctrl, aer_type); ctrl->aen_result = result; break; default: break; } queue_work(nvme_wq, &ctrl->async_event_work); } EXPORT_SYMBOL_GPL(nvme_complete_async_event); void nvme_stop_ctrl(struct nvme_ctrl *ctrl) { nvme_mpath_stop(ctrl); nvme_stop_keep_alive(ctrl); flush_work(&ctrl->async_event_work); cancel_work_sync(&ctrl->fw_act_work); if (ctrl->ops->stop_ctrl) ctrl->ops->stop_ctrl(ctrl); } EXPORT_SYMBOL_GPL(nvme_stop_ctrl); void nvme_start_ctrl(struct nvme_ctrl *ctrl) { if (ctrl->kato) nvme_start_keep_alive(ctrl); if (ctrl->queue_count > 1) { nvme_queue_scan(ctrl); nvme_enable_aen(ctrl); queue_work(nvme_wq, &ctrl->async_event_work); nvme_start_queues(ctrl); } } EXPORT_SYMBOL_GPL(nvme_start_ctrl); void nvme_uninit_ctrl(struct nvme_ctrl *ctrl) { cdev_device_del(&ctrl->cdev, ctrl->device); } EXPORT_SYMBOL_GPL(nvme_uninit_ctrl); static void nvme_free_ctrl(struct device *dev) { struct nvme_ctrl *ctrl = container_of(dev, struct nvme_ctrl, ctrl_device); struct nvme_subsystem *subsys = ctrl->subsys; ida_simple_remove(&nvme_instance_ida, ctrl->instance); kfree(ctrl->effects); nvme_mpath_uninit(ctrl); __free_page(ctrl->discard_page); if (subsys) { mutex_lock(&subsys->lock); list_del(&ctrl->subsys_entry); mutex_unlock(&subsys->lock); sysfs_remove_link(&subsys->dev.kobj, dev_name(ctrl->device)); } ctrl->ops->free_ctrl(ctrl); if (subsys) nvme_put_subsystem(subsys); } /* * Initialize a NVMe controller structures. This needs to be called during * earliest initialization so that we have the initialized structured around * during probing. */ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev, const struct nvme_ctrl_ops *ops, unsigned long quirks) { int ret; ctrl->state = NVME_CTRL_NEW; spin_lock_init(&ctrl->lock); mutex_init(&ctrl->scan_lock); INIT_LIST_HEAD(&ctrl->namespaces); init_rwsem(&ctrl->namespaces_rwsem); ctrl->dev = dev; ctrl->ops = ops; ctrl->quirks = quirks; INIT_WORK(&ctrl->scan_work, nvme_scan_work); INIT_WORK(&ctrl->async_event_work, nvme_async_event_work); INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work); INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work); INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work); memset(&ctrl->ka_cmd, 0, sizeof(ctrl->ka_cmd)); ctrl->ka_cmd.common.opcode = nvme_admin_keep_alive; BUILD_BUG_ON(NVME_DSM_MAX_RANGES * sizeof(struct nvme_dsm_range) > PAGE_SIZE); ctrl->discard_page = alloc_page(GFP_KERNEL); if (!ctrl->discard_page) { ret = -ENOMEM; goto out; } ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL); if (ret < 0) goto out; ctrl->instance = ret; device_initialize(&ctrl->ctrl_device); ctrl->device = &ctrl->ctrl_device; ctrl->device->devt = MKDEV(MAJOR(nvme_chr_devt), ctrl->instance); ctrl->device->class = nvme_class; ctrl->device->parent = ctrl->dev; ctrl->device->groups = nvme_dev_attr_groups; ctrl->device->release = nvme_free_ctrl; dev_set_drvdata(ctrl->device, ctrl); ret = dev_set_name(ctrl->device, "nvme%d", ctrl->instance); if (ret) goto out_release_instance; cdev_init(&ctrl->cdev, &nvme_dev_fops); ctrl->cdev.owner = ops->module; ret = cdev_device_add(&ctrl->cdev, ctrl->device); if (ret) goto out_free_name; /* * Initialize latency tolerance controls. The sysfs files won't * be visible to userspace unless the device actually supports APST. */ ctrl->device->power.set_latency_tolerance = nvme_set_latency_tolerance; dev_pm_qos_update_user_latency_tolerance(ctrl->device, min(default_ps_max_latency_us, (unsigned long)S32_MAX)); return 0; out_free_name: kfree_const(ctrl->device->kobj.name); out_release_instance: ida_simple_remove(&nvme_instance_ida, ctrl->instance); out: if (ctrl->discard_page) __free_page(ctrl->discard_page); return ret; } EXPORT_SYMBOL_GPL(nvme_init_ctrl); /** * nvme_kill_queues(): Ends all namespace queues * @ctrl: the dead controller that needs to end * * Call this function when the driver determines it is unable to get the * controller in a state capable of servicing IO. */ void nvme_kill_queues(struct nvme_ctrl *ctrl) { struct nvme_ns *ns; down_read(&ctrl->namespaces_rwsem); /* Forcibly unquiesce queues to avoid blocking dispatch */ if (ctrl->admin_q && !blk_queue_dying(ctrl->admin_q)) blk_mq_unquiesce_queue(ctrl->admin_q); list_for_each_entry(ns, &ctrl->namespaces, list) nvme_set_queue_dying(ns); up_read(&ctrl->namespaces_rwsem); } EXPORT_SYMBOL_GPL(nvme_kill_queues); void nvme_unfreeze(struct nvme_ctrl *ctrl) { struct nvme_ns *ns; down_read(&ctrl->namespaces_rwsem); list_for_each_entry(ns, &ctrl->namespaces, list) blk_mq_unfreeze_queue(ns->queue); up_read(&ctrl->namespaces_rwsem); } EXPORT_SYMBOL_GPL(nvme_unfreeze); void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout) { struct nvme_ns *ns; down_read(&ctrl->namespaces_rwsem); list_for_each_entry(ns, &ctrl->namespaces, list) { timeout = blk_mq_freeze_queue_wait_timeout(ns->queue, timeout); if (timeout <= 0) break; } up_read(&ctrl->namespaces_rwsem); } EXPORT_SYMBOL_GPL(nvme_wait_freeze_timeout); void nvme_wait_freeze(struct nvme_ctrl *ctrl) { struct nvme_ns *ns; down_read(&ctrl->namespaces_rwsem); list_for_each_entry(ns, &ctrl->namespaces, list) blk_mq_freeze_queue_wait(ns->queue); up_read(&ctrl->namespaces_rwsem); } EXPORT_SYMBOL_GPL(nvme_wait_freeze); void nvme_start_freeze(struct nvme_ctrl *ctrl) { struct nvme_ns *ns; down_read(&ctrl->namespaces_rwsem); list_for_each_entry(ns, &ctrl->namespaces, list) blk_freeze_queue_start(ns->queue); up_read(&ctrl->namespaces_rwsem); } EXPORT_SYMBOL_GPL(nvme_start_freeze); void nvme_stop_queues(struct nvme_ctrl *ctrl) { struct nvme_ns *ns; down_read(&ctrl->namespaces_rwsem); list_for_each_entry(ns, &ctrl->namespaces, list) blk_mq_quiesce_queue(ns->queue); up_read(&ctrl->namespaces_rwsem); } EXPORT_SYMBOL_GPL(nvme_stop_queues); void nvme_start_queues(struct nvme_ctrl *ctrl) { struct nvme_ns *ns; down_read(&ctrl->namespaces_rwsem); list_for_each_entry(ns, &ctrl->namespaces, list) blk_mq_unquiesce_queue(ns->queue); up_read(&ctrl->namespaces_rwsem); } EXPORT_SYMBOL_GPL(nvme_start_queues); int __init nvme_core_init(void) { int result = -ENOMEM; nvme_wq = alloc_workqueue("nvme-wq", WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0); if (!nvme_wq) goto out; nvme_reset_wq = alloc_workqueue("nvme-reset-wq", WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0); if (!nvme_reset_wq) goto destroy_wq; nvme_delete_wq = alloc_workqueue("nvme-delete-wq", WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0); if (!nvme_delete_wq) goto destroy_reset_wq; result = alloc_chrdev_region(&nvme_chr_devt, 0, NVME_MINORS, "nvme"); if (result < 0) goto destroy_delete_wq; nvme_class = class_create(THIS_MODULE, "nvme"); if (IS_ERR(nvme_class)) { result = PTR_ERR(nvme_class); goto unregister_chrdev; } nvme_subsys_class = class_create(THIS_MODULE, "nvme-subsystem"); if (IS_ERR(nvme_subsys_class)) { result = PTR_ERR(nvme_subsys_class); goto destroy_class; } return 0; destroy_class: class_destroy(nvme_class); unregister_chrdev: unregister_chrdev_region(nvme_chr_devt, NVME_MINORS); destroy_delete_wq: destroy_workqueue(nvme_delete_wq); destroy_reset_wq: destroy_workqueue(nvme_reset_wq); destroy_wq: destroy_workqueue(nvme_wq); out: return result; } void __exit nvme_core_exit(void) { ida_destroy(&nvme_subsystems_ida); class_destroy(nvme_subsys_class); class_destroy(nvme_class); unregister_chrdev_region(nvme_chr_devt, NVME_MINORS); destroy_workqueue(nvme_delete_wq); destroy_workqueue(nvme_reset_wq); destroy_workqueue(nvme_wq); } MODULE_LICENSE("GPL"); MODULE_VERSION("1.0"); module_init(nvme_core_init); module_exit(nvme_core_exit);
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