| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Christoph Hellwig | 8599 | 38.43% | 148 | 29.60% |
| Keith Busch | 3507 | 15.67% | 68 | 13.60% |
| Logan Gunthorpe | 1207 | 5.39% | 7 | 1.40% |
| Sagi Grimberg | 1200 | 5.36% | 39 | 7.80% |
| Andrew Lutomirski | 917 | 4.10% | 7 | 1.40% |
| Ming Lin | 854 | 3.82% | 8 | 1.60% |
| Jens Axboe | 734 | 3.28% | 5 | 1.00% |
| Chaitanya Kulkarni | 626 | 2.80% | 25 | 5.00% |
| Minwoo Im | 429 | 1.92% | 10 | 2.00% |
| Hannes Reinecke | 365 | 1.63% | 14 | 2.80% |
| Johannes Thumshirn | 299 | 1.34% | 6 | 1.20% |
| Arnav Dawn | 257 | 1.15% | 2 | 0.40% |
| Alexey Bogoslavsky | 210 | 0.94% | 1 | 0.20% |
| Victor Gladkov | 210 | 0.94% | 1 | 0.20% |
| Scott Bauer | 206 | 0.92% | 5 | 1.00% |
| Bart Van Assche | 191 | 0.85% | 10 | 2.00% |
| Tao Chiu | 188 | 0.84% | 1 | 0.20% |
| Matias Björling | 168 | 0.75% | 6 | 1.20% |
| Jianchao Wang | 157 | 0.70% | 4 | 0.80% |
| James Smart | 153 | 0.68% | 8 | 1.60% |
| Chao Leng | 152 | 0.68% | 5 | 1.00% |
| Tatsuya Sasaki | 150 | 0.67% | 1 | 0.20% |
| Max Gurtovoy | 140 | 0.63% | 18 | 3.60% |
| Daniel Wagner | 107 | 0.48% | 4 | 0.80% |
| Roy Shterman | 101 | 0.45% | 1 | 0.20% |
| Jon Derrick | 97 | 0.43% | 1 | 0.20% |
| Nitzan Carmi | 65 | 0.29% | 2 | 0.40% |
| Martin K. Petersen | 64 | 0.29% | 1 | 0.20% |
| Linus Torvalds | 58 | 0.26% | 3 | 0.60% |
| Sunad Bhandary | 58 | 0.26% | 1 | 0.20% |
| Israel Rukshin | 57 | 0.25% | 6 | 1.20% |
| Anton Eidelman | 49 | 0.22% | 1 | 0.20% |
| Niklas Svensson (Niklas Cassel) | 43 | 0.19% | 1 | 0.20% |
| Kai-Heng Feng | 43 | 0.19% | 3 | 0.60% |
| Kanchan Joshi | 43 | 0.19% | 3 | 0.60% |
| Damien Le Moal | 40 | 0.18% | 4 | 0.80% |
| Luis R. Rodriguez | 37 | 0.17% | 1 | 0.20% |
| Martin Wilck | 36 | 0.16% | 3 | 0.60% |
| Guilherme G. Piccoli | 35 | 0.16% | 2 | 0.40% |
| Akinobu Mita | 35 | 0.16% | 2 | 0.40% |
| Nicholas Bellinger | 35 | 0.16% | 1 | 0.20% |
| Guenter Roeck | 34 | 0.15% | 1 | 0.20% |
| Adam Manzanares | 32 | 0.14% | 1 | 0.20% |
| Marta Rybczynska | 27 | 0.12% | 1 | 0.20% |
| Javier González | 25 | 0.11% | 6 | 1.20% |
| Ming Lei | 24 | 0.11% | 3 | 0.60% |
| Martin Belanger | 23 | 0.10% | 1 | 0.20% |
| Jeff Lien | 23 | 0.10% | 1 | 0.20% |
| Mario Limonciello | 18 | 0.08% | 1 | 0.20% |
| Gopal Tiwari | 17 | 0.08% | 1 | 0.20% |
| Bo Wu | 16 | 0.07% | 1 | 0.20% |
| Eduard Hasenleithner | 15 | 0.07% | 1 | 0.20% |
| Mikhail Skorzhinskii | 15 | 0.07% | 1 | 0.20% |
| Edmund Nadolski | 15 | 0.07% | 2 | 0.40% |
| James Dingwall | 13 | 0.06% | 1 | 0.20% |
| Gustavo A. R. Silva | 12 | 0.05% | 1 | 0.20% |
| Nick Bowler | 12 | 0.05% | 1 | 0.20% |
| Dan Carpenter | 11 | 0.05% | 4 | 0.80% |
| Laine Walker-Avina | 11 | 0.05% | 1 | 0.20% |
| Thomas Tai | 10 | 0.04% | 1 | 0.20% |
| Gabriel Krisman Bertazi | 10 | 0.04% | 1 | 0.20% |
| Junxiong Guan | 9 | 0.04% | 1 | 0.20% |
| Igor Konopko | 8 | 0.04% | 1 | 0.20% |
| Yufen Yu | 8 | 0.04% | 2 | 0.40% |
| Dan J Williams | 5 | 0.02% | 1 | 0.20% |
| Jiapeng Chong | 5 | 0.02% | 1 | 0.20% |
| Joe Perches | 5 | 0.02% | 1 | 0.20% |
| Anthony Iliopoulos | 5 | 0.02% | 1 | 0.20% |
| Xiao Jiang | 5 | 0.02% | 1 | 0.20% |
| Marc Olson | 4 | 0.02% | 1 | 0.20% |
| Balbir Singh | 4 | 0.02% | 2 | 0.40% |
| Josh Triplett | 4 | 0.02% | 1 | 0.20% |
| Ivan Bornyakov | 4 | 0.02% | 1 | 0.20% |
| weiping zhang | 3 | 0.01% | 1 | 0.20% |
| Parav Pandit | 3 | 0.01% | 1 | 0.20% |
| Rupesh Girase | 3 | 0.01% | 1 | 0.20% |
| Rikard Falkeborn | 2 | 0.01% | 1 | 0.20% |
| Yi Zhang | 2 | 0.01% | 1 | 0.20% |
| Michael Christie | 2 | 0.01% | 2 | 0.40% |
| Baolin Wang | 1 | 0.00% | 1 | 0.20% |
| Paul E. McKenney | 1 | 0.00% | 1 | 0.20% |
| Arnd Bergmann | 1 | 0.00% | 1 | 0.20% |
| John Meneghini | 1 | 0.00% | 1 | 0.20% |
| Chengguang Xu | 1 | 0.00% | 1 | 0.20% |
| David Disseldorp | 1 | 0.00% | 1 | 0.20% |
| Nigel Kirkland | 1 | 0.00% | 1 | 0.20% |
| Lei Ming | 1 | 0.00% | 1 | 0.20% |
| Jaesoo Lee | 1 | 0.00% | 1 | 0.20% |
| Total | 22375 | 500 |
// SPDX-License-Identifier: GPL-2.0 /* * NVM Express device driver * Copyright (c) 2011-2014, Intel Corporation. */ #include <linux/blkdev.h> #include <linux/blk-mq.h> #include <linux/compat.h> #include <linux/delay.h> #include <linux/errno.h> #include <linux/hdreg.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/backing-dev.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/pr.h> #include <linux/ptrace.h> #include <linux/nvme_ioctl.h> #include <linux/pm_qos.h> #include <asm/unaligned.h> #include "nvme.h" #include "fabrics.h" #define CREATE_TRACE_POINTS #include "trace.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 unsigned long apst_primary_timeout_ms = 100; module_param(apst_primary_timeout_ms, ulong, 0644); MODULE_PARM_DESC(apst_primary_timeout_ms, "primary APST timeout in ms"); static unsigned long apst_secondary_timeout_ms = 2000; module_param(apst_secondary_timeout_ms, ulong, 0644); MODULE_PARM_DESC(apst_secondary_timeout_ms, "secondary APST timeout in ms"); static unsigned long apst_primary_latency_tol_us = 15000; module_param(apst_primary_latency_tol_us, ulong, 0644); MODULE_PARM_DESC(apst_primary_latency_tol_us, "primary APST latency tolerance in us"); static unsigned long apst_secondary_latency_tol_us = 100000; module_param(apst_secondary_latency_tol_us, ulong, 0644); MODULE_PARM_DESC(apst_secondary_latency_tol_us, "secondary APST latency tolerance in us"); 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 as scan, aen handling, fw activation, * keep-alive, 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 LIST_HEAD(nvme_subsystems); static DEFINE_MUTEX(nvme_subsystems_lock); static DEFINE_IDA(nvme_instance_ida); static dev_t nvme_ctrl_base_chr_devt; static struct class *nvme_class; static struct class *nvme_subsys_class; static DEFINE_IDA(nvme_ns_chr_minor_ida); static dev_t nvme_ns_chr_devt; static struct class *nvme_ns_chr_class; static void nvme_put_subsystem(struct nvme_subsystem *subsys); static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl, unsigned nsid); static void nvme_update_keep_alive(struct nvme_ctrl *ctrl, struct nvme_command *cmd); /* * Prepare a queue for teardown. * * This must forcibly unquiesce queues to avoid blocking dispatch, and only set * the capacity to 0 after that to avoid blocking dispatchers that may be * holding bd_butex. This will end buffered writers dirtying pages that can't * be synced. */ static void nvme_set_queue_dying(struct nvme_ns *ns) { if (test_and_set_bit(NVME_NS_DEAD, &ns->flags)) return; blk_set_queue_dying(ns->queue); blk_mq_unquiesce_queue(ns->queue); set_capacity_and_notify(ns->disk, 0); } 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 && ctrl->tagset) queue_work(nvme_wq, &ctrl->scan_work); } /* * Use this function to proceed with scheduling reset_work for a controller * that had previously been set to the resetting state. This is intended for * code paths that can't be interrupted by other reset attempts. A hot removal * may prevent this from succeeding. */ int nvme_try_sched_reset(struct nvme_ctrl *ctrl) { if (ctrl->state != NVME_CTRL_RESETTING) return -EBUSY; if (!queue_work(nvme_reset_wq, &ctrl->reset_work)) return -EBUSY; return 0; } EXPORT_SYMBOL_GPL(nvme_try_sched_reset); static void nvme_failfast_work(struct work_struct *work) { struct nvme_ctrl *ctrl = container_of(to_delayed_work(work), struct nvme_ctrl, failfast_work); if (ctrl->state != NVME_CTRL_CONNECTING) return; set_bit(NVME_CTRL_FAILFAST_EXPIRED, &ctrl->flags); dev_info(ctrl->device, "failfast expired\n"); nvme_kick_requeue_lists(ctrl); } static inline void nvme_start_failfast_work(struct nvme_ctrl *ctrl) { if (!ctrl->opts || ctrl->opts->fast_io_fail_tmo == -1) return; schedule_delayed_work(&ctrl->failfast_work, ctrl->opts->fast_io_fail_tmo * HZ); } static inline void nvme_stop_failfast_work(struct nvme_ctrl *ctrl) { if (!ctrl->opts) return; cancel_delayed_work_sync(&ctrl->failfast_work); clear_bit(NVME_CTRL_FAILFAST_EXPIRED, &ctrl->flags); } 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) ret = -ENETRESET; } return ret; } static void nvme_do_delete_ctrl(struct nvme_ctrl *ctrl) { 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); } static void nvme_delete_ctrl_work(struct work_struct *work) { struct nvme_ctrl *ctrl = container_of(work, struct nvme_ctrl, delete_work); nvme_do_delete_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); static void nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl) { /* * Keep a reference until nvme_do_delete_ctrl() complete, * since ->delete_ctrl can free the controller. */ nvme_get_ctrl(ctrl); if (nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING)) nvme_do_delete_ctrl(ctrl); nvme_put_ctrl(ctrl); } static blk_status_t nvme_error_status(u16 status) { switch (status & 0x7ff) { case NVME_SC_SUCCESS: return BLK_STS_OK; case NVME_SC_CAP_EXCEEDED: return BLK_STS_NOSPC; case NVME_SC_LBA_RANGE: case NVME_SC_CMD_INTERRUPTED: case NVME_SC_NS_NOT_READY: 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; case NVME_SC_HOST_PATH_ERROR: return BLK_STS_TRANSPORT; case NVME_SC_ZONE_TOO_MANY_ACTIVE: return BLK_STS_ZONE_ACTIVE_RESOURCE; case NVME_SC_ZONE_TOO_MANY_OPEN: return BLK_STS_ZONE_OPEN_RESOURCE; default: return BLK_STS_IOERR; } } static void nvme_retry_req(struct request *req) { unsigned long delay = 0; u16 crd; /* The mask and shift result must be <= 3 */ crd = (nvme_req(req)->status & NVME_SC_CRD) >> 11; if (crd) delay = nvme_req(req)->ctrl->crdt[crd - 1] * 100; nvme_req(req)->retries++; blk_mq_requeue_request(req, false); blk_mq_delay_kick_requeue_list(req->q, delay); } enum nvme_disposition { COMPLETE, RETRY, FAILOVER, }; static inline enum nvme_disposition nvme_decide_disposition(struct request *req) { if (likely(nvme_req(req)->status == 0)) return COMPLETE; if (blk_noretry_request(req) || (nvme_req(req)->status & NVME_SC_DNR) || nvme_req(req)->retries >= nvme_max_retries) return COMPLETE; if (req->cmd_flags & REQ_NVME_MPATH) { if (nvme_is_path_error(nvme_req(req)->status) || blk_queue_dying(req->q)) return FAILOVER; } else { if (blk_queue_dying(req->q)) return COMPLETE; } return RETRY; } static inline void nvme_end_req(struct request *req) { blk_status_t status = nvme_error_status(nvme_req(req)->status); if (IS_ENABLED(CONFIG_BLK_DEV_ZONED) && req_op(req) == REQ_OP_ZONE_APPEND) req->__sector = nvme_lba_to_sect(req->q->queuedata, le64_to_cpu(nvme_req(req)->result.u64)); nvme_trace_bio_complete(req); blk_mq_end_request(req, status); } void nvme_complete_rq(struct request *req) { trace_nvme_complete_rq(req); nvme_cleanup_cmd(req); if (nvme_req(req)->ctrl->kas) nvme_req(req)->ctrl->comp_seen = true; switch (nvme_decide_disposition(req)) { case COMPLETE: nvme_end_req(req); return; case RETRY: nvme_retry_req(req); return; case FAILOVER: nvme_failover_req(req); return; } } EXPORT_SYMBOL_GPL(nvme_complete_rq); /* * Called to unwind from ->queue_rq on a failed command submission so that the * multipathing code gets called to potentially failover to another path. * The caller needs to unwind all transport specific resource allocations and * must return propagate the return value. */ blk_status_t nvme_host_path_error(struct request *req) { nvme_req(req)->status = NVME_SC_HOST_PATH_ERROR; blk_mq_set_request_complete(req); nvme_complete_rq(req); return BLK_STS_OK; } EXPORT_SYMBOL_GPL(nvme_host_path_error); 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); /* don't abort one completed request */ if (blk_mq_request_completed(req)) return true; nvme_req(req)->status = NVME_SC_HOST_ABORTED_CMD; nvme_req(req)->flags |= NVME_REQ_CANCELLED; blk_mq_complete_request(req); return true; } EXPORT_SYMBOL_GPL(nvme_cancel_request); void nvme_cancel_tagset(struct nvme_ctrl *ctrl) { if (ctrl->tagset) { blk_mq_tagset_busy_iter(ctrl->tagset, nvme_cancel_request, ctrl); blk_mq_tagset_wait_completed_request(ctrl->tagset); } } EXPORT_SYMBOL_GPL(nvme_cancel_tagset); void nvme_cancel_admin_tagset(struct nvme_ctrl *ctrl) { if (ctrl->admin_tagset) { blk_mq_tagset_busy_iter(ctrl->admin_tagset, nvme_cancel_request, ctrl); blk_mq_tagset_wait_completed_request(ctrl->admin_tagset); } } EXPORT_SYMBOL_GPL(nvme_cancel_admin_tagset); 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_LIVE: switch (old_state) { case NVME_CTRL_NEW: case NVME_CTRL_RESETTING: case NVME_CTRL_CONNECTING: changed = true; fallthrough; default: break; } break; case NVME_CTRL_RESETTING: switch (old_state) { case NVME_CTRL_NEW: case NVME_CTRL_LIVE: changed = true; fallthrough; default: break; } break; case NVME_CTRL_CONNECTING: switch (old_state) { case NVME_CTRL_NEW: case NVME_CTRL_RESETTING: changed = true; fallthrough; default: break; } break; case NVME_CTRL_DELETING: switch (old_state) { case NVME_CTRL_LIVE: case NVME_CTRL_RESETTING: case NVME_CTRL_CONNECTING: changed = true; fallthrough; default: break; } break; case NVME_CTRL_DELETING_NOIO: switch (old_state) { case NVME_CTRL_DELETING: case NVME_CTRL_DEAD: changed = true; fallthrough; default: break; } break; case NVME_CTRL_DEAD: switch (old_state) { case NVME_CTRL_DELETING: changed = true; fallthrough; default: break; } break; default: break; } if (changed) { ctrl->state = new_state; wake_up_all(&ctrl->state_wq); } spin_unlock_irqrestore(&ctrl->lock, flags); if (!changed) return false; if (ctrl->state == NVME_CTRL_LIVE) { if (old_state == NVME_CTRL_CONNECTING) nvme_stop_failfast_work(ctrl); nvme_kick_requeue_lists(ctrl); } else if (ctrl->state == NVME_CTRL_CONNECTING && old_state == NVME_CTRL_RESETTING) { nvme_start_failfast_work(ctrl); } return changed; } EXPORT_SYMBOL_GPL(nvme_change_ctrl_state); /* * Returns true for sink states that can't ever transition back to live. */ static bool nvme_state_terminal(struct nvme_ctrl *ctrl) { switch (ctrl->state) { case NVME_CTRL_NEW: case NVME_CTRL_LIVE: case NVME_CTRL_RESETTING: case NVME_CTRL_CONNECTING: return false; case NVME_CTRL_DELETING: case NVME_CTRL_DELETING_NOIO: case NVME_CTRL_DEAD: return true; default: WARN_ONCE(1, "Unhandled ctrl state:%d", ctrl->state); return true; } } /* * Waits for the controller state to be resetting, or returns false if it is * not possible to ever transition to that state. */ bool nvme_wait_reset(struct nvme_ctrl *ctrl) { wait_event(ctrl->state_wq, nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING) || nvme_state_terminal(ctrl)); return ctrl->state == NVME_CTRL_RESETTING; } EXPORT_SYMBOL_GPL(nvme_wait_reset); 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); cleanup_srcu_struct(&head->srcu); nvme_put_subsystem(head->subsys); kfree(head); } bool nvme_tryget_ns_head(struct nvme_ns_head *head) { return kref_get_unless_zero(&head->ref); } 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); put_disk(ns->disk); nvme_put_ns_head(ns->head); nvme_put_ctrl(ns->ctrl); kfree(ns); } static inline bool nvme_get_ns(struct nvme_ns *ns) { return kref_get_unless_zero(&ns->kref); } void nvme_put_ns(struct nvme_ns *ns) { kref_put(&ns->kref, nvme_free_ns); } EXPORT_SYMBOL_NS_GPL(nvme_put_ns, NVME_TARGET_PASSTHRU); static inline void nvme_clear_nvme_request(struct request *req) { nvme_req(req)->status = 0; nvme_req(req)->retries = 0; nvme_req(req)->flags = 0; req->rq_flags |= RQF_DONTPREP; } static inline unsigned int nvme_req_op(struct nvme_command *cmd) { return nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN; } static inline void nvme_init_request(struct request *req, struct nvme_command *cmd) { if (req->q->queuedata) req->timeout = NVME_IO_TIMEOUT; else /* no queuedata implies admin queue */ req->timeout = NVME_ADMIN_TIMEOUT; /* passthru commands should let the driver set the SGL flags */ cmd->common.flags &= ~NVME_CMD_SGL_ALL; req->cmd_flags |= REQ_FAILFAST_DRIVER; if (req->mq_hctx->type == HCTX_TYPE_POLL) req->cmd_flags |= REQ_HIPRI; nvme_clear_nvme_request(req); memcpy(nvme_req(req)->cmd, cmd, sizeof(*cmd)); } struct request *nvme_alloc_request(struct request_queue *q, struct nvme_command *cmd, blk_mq_req_flags_t flags) { struct request *req; req = blk_mq_alloc_request(q, nvme_req_op(cmd), flags); if (!IS_ERR(req)) nvme_init_request(req, cmd); return req; } EXPORT_SYMBOL_GPL(nvme_alloc_request); static struct request *nvme_alloc_request_qid(struct request_queue *q, struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid) { struct request *req; req = blk_mq_alloc_request_hctx(q, nvme_req_op(cmd), flags, qid ? qid - 1 : 0); if (!IS_ERR(req)) nvme_init_request(req, cmd); return req; } /* * For something we're not in a state to send to the device the default action * is to busy it and retry it after the controller state is recovered. However, * if the controller is deleting or if anything is marked for failfast or * nvme multipath it is immediately failed. * * Note: commands used to initialize the controller will be marked for failfast. * Note: nvme cli/ioctl commands are marked for failfast. */ blk_status_t nvme_fail_nonready_command(struct nvme_ctrl *ctrl, struct request *rq) { if (ctrl->state != NVME_CTRL_DELETING_NOIO && ctrl->state != NVME_CTRL_DEAD && !test_bit(NVME_CTRL_FAILFAST_EXPIRED, &ctrl->flags) && !blk_noretry_request(rq) && !(rq->cmd_flags & REQ_NVME_MPATH)) return BLK_STS_RESOURCE; return nvme_host_path_error(rq); } EXPORT_SYMBOL_GPL(nvme_fail_nonready_command); bool __nvme_check_ready(struct nvme_ctrl *ctrl, struct request *rq, bool queue_live) { struct nvme_request *req = nvme_req(rq); /* * currently we have a problem sending passthru commands * on the admin_q if the controller is not LIVE because we can't * make sure that they are going out after the admin connect, * controller enable and/or other commands in the initialization * sequence. until the controller will be LIVE, fail with * BLK_STS_RESOURCE so that they will be rescheduled. */ if (rq->q == ctrl->admin_q && (req->flags & NVME_REQ_USERCMD)) return false; if (ctrl->ops->flags & NVME_F_FABRICS) { /* * Only allow commands on a live queue, except for the connect * command, which is require to set the queue live in the * appropinquate states. */ switch (ctrl->state) { case NVME_CTRL_CONNECTING: if (blk_rq_is_passthrough(rq) && nvme_is_fabrics(req->cmd) && req->cmd->fabrics.fctype == nvme_fabrics_type_connect) return true; break; default: break; case NVME_CTRL_DEAD: return false; } } return queue_live; } EXPORT_SYMBOL_GPL(__nvme_check_ready); static int nvme_toggle_streams(struct nvme_ctrl *ctrl, bool enable) { struct nvme_command 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(s, 0, sizeof(*s)); c.directive.opcode = nvme_admin_directive_recv; c.directive.nsid = cpu_to_le32(nsid); c.directive.numd = cpu_to_le32(nvme_bytes_to_numd(sizeof(*s))); 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) goto out_disable_stream; 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); goto out_disable_stream; } ctrl->nr_streams = min_t(u16, ctrl->nssa, BLK_MAX_WRITE_HINTS - 1); dev_info(ctrl->device, "Using %u streams\n", ctrl->nr_streams); return 0; out_disable_stream: nvme_disable_streams(ctrl); return ret; } /* * 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; /* * Some devices do not consider the DSM 'Number of Ranges' field when * determining how much data to DMA. Always allocate memory for maximum * number of segments to prevent device reading beyond end of buffer. */ static const size_t alloc_size = sizeof(*range) * NVME_DSM_MAX_RANGES; range = kzalloc(alloc_size, 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_sect_to_lba(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 = alloc_size; req->rq_flags |= RQF_SPECIAL_PAYLOAD; return BLK_STS_OK; } static inline blk_status_t nvme_setup_write_zeroes(struct nvme_ns *ns, struct request *req, struct nvme_command *cmnd) { if (ns->ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES) return nvme_setup_discard(ns, req, cmnd); cmnd->write_zeroes.opcode = nvme_cmd_write_zeroes; cmnd->write_zeroes.nsid = cpu_to_le32(ns->head->ns_id); cmnd->write_zeroes.slba = cpu_to_le64(nvme_sect_to_lba(ns, blk_rq_pos(req))); cmnd->write_zeroes.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1); if (nvme_ns_has_pi(ns)) cmnd->write_zeroes.control = cpu_to_le16(NVME_RW_PRINFO_PRACT); else cmnd->write_zeroes.control = 0; return BLK_STS_OK; } static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns, struct request *req, struct nvme_command *cmnd, enum nvme_opcode op) { 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 = op; cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id); cmnd->rw.slba = cpu_to_le64(nvme_sect_to_lba(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; } 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; if (op == nvme_cmd_zone_append) control |= NVME_RW_APPEND_PIREMAP; 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 (req->rq_flags & RQF_SPECIAL_PAYLOAD) { struct nvme_ctrl *ctrl = nvme_req(req)->ctrl; if (req->special_vec.bv_page == ctrl->discard_page) clear_bit_unlock(0, &ctrl->discard_page_busy); else kfree(bvec_virt(&req->special_vec)); } } EXPORT_SYMBOL_GPL(nvme_cleanup_cmd); blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req) { struct nvme_command *cmd = nvme_req(req)->cmd; struct nvme_ctrl *ctrl = nvme_req(req)->ctrl; blk_status_t ret = BLK_STS_OK; if (!(req->rq_flags & RQF_DONTPREP)) { nvme_clear_nvme_request(req); memset(cmd, 0, sizeof(*cmd)); } switch (req_op(req)) { case REQ_OP_DRV_IN: case REQ_OP_DRV_OUT: /* these are setup prior to execution in nvme_init_request() */ break; case REQ_OP_FLUSH: nvme_setup_flush(ns, cmd); break; case REQ_OP_ZONE_RESET_ALL: case REQ_OP_ZONE_RESET: ret = nvme_setup_zone_mgmt_send(ns, req, cmd, NVME_ZONE_RESET); break; case REQ_OP_ZONE_OPEN: ret = nvme_setup_zone_mgmt_send(ns, req, cmd, NVME_ZONE_OPEN); break; case REQ_OP_ZONE_CLOSE: ret = nvme_setup_zone_mgmt_send(ns, req, cmd, NVME_ZONE_CLOSE); break; case REQ_OP_ZONE_FINISH: ret = nvme_setup_zone_mgmt_send(ns, req, cmd, NVME_ZONE_FINISH); break; case REQ_OP_WRITE_ZEROES: ret = nvme_setup_write_zeroes(ns, req, cmd); break; case REQ_OP_DISCARD: ret = nvme_setup_discard(ns, req, cmd); break; case REQ_OP_READ: ret = nvme_setup_rw(ns, req, cmd, nvme_cmd_read); break; case REQ_OP_WRITE: ret = nvme_setup_rw(ns, req, cmd, nvme_cmd_write); break; case REQ_OP_ZONE_APPEND: ret = nvme_setup_rw(ns, req, cmd, nvme_cmd_zone_append); break; default: WARN_ON_ONCE(1); return BLK_STS_IOERR; } if (!(ctrl->quirks & NVME_QUIRK_SKIP_CID_GEN)) nvme_req(req)->genctr++; cmd->common.command_id = nvme_cid(req); trace_nvme_setup_cmd(req, cmd); return ret; } EXPORT_SYMBOL_GPL(nvme_setup_cmd); /* * Return values: * 0: success * >0: nvme controller's cqe status response * <0: kernel error in lieu of controller response */ static int nvme_execute_rq(struct gendisk *disk, struct request *rq, bool at_head) { blk_status_t status; status = blk_execute_rq(disk, rq, at_head); if (nvme_req(rq)->flags & NVME_REQ_CANCELLED) return -EINTR; if (nvme_req(rq)->status) return nvme_req(rq)->status; return blk_status_to_errno(status); } /* * 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) { struct request *req; int ret; if (qid == NVME_QID_ANY) req = nvme_alloc_request(q, cmd, flags); else req = nvme_alloc_request_qid(q, cmd, flags, qid); if (IS_ERR(req)) return PTR_ERR(req); if (timeout) req->timeout = timeout; if (buffer && bufflen) { ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL); if (ret) goto out; } ret = nvme_execute_rq(NULL, req, at_head); if (result && ret >= 0) *result = nvme_req(req)->result; 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); } EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd); static u32 nvme_known_admin_effects(u8 opcode) { switch (opcode) { case nvme_admin_format_nvm: return NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_NCC | NVME_CMD_EFFECTS_CSE_MASK; case nvme_admin_sanitize_nvm: return NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK; default: break; } return 0; } u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u8 opcode) { u32 effects = 0; if (ns) { if (ns->head->effects) effects = le32_to_cpu(ns->head->effects->iocs[opcode]); if (effects & ~(NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC)) dev_warn_once(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]); effects |= nvme_known_admin_effects(opcode); return effects; } EXPORT_SYMBOL_NS_GPL(nvme_command_effects, NVME_TARGET_PASSTHRU); static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u8 opcode) { u32 effects = nvme_command_effects(ctrl, ns, 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_CSE_MASK) { mutex_lock(&ctrl->scan_lock); mutex_lock(&ctrl->subsys->lock); nvme_mpath_start_freeze(ctrl->subsys); nvme_mpath_wait_freeze(ctrl->subsys); nvme_start_freeze(ctrl); nvme_wait_freeze(ctrl); } return effects; } static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects, struct nvme_command *cmd, int status) { if (effects & NVME_CMD_EFFECTS_CSE_MASK) { nvme_unfreeze(ctrl); nvme_mpath_unfreeze(ctrl->subsys); mutex_unlock(&ctrl->subsys->lock); nvme_remove_invalid_namespaces(ctrl, NVME_NSID_ALL); mutex_unlock(&ctrl->scan_lock); } if (effects & NVME_CMD_EFFECTS_CCC) nvme_init_ctrl_finish(ctrl); if (effects & (NVME_CMD_EFFECTS_NIC | NVME_CMD_EFFECTS_NCC)) { nvme_queue_scan(ctrl); flush_work(&ctrl->scan_work); } switch (cmd->common.opcode) { case nvme_admin_set_features: switch (le32_to_cpu(cmd->common.cdw10) & 0xFF) { case NVME_FEAT_KATO: /* * Keep alive commands interval on the host should be * updated when KATO is modified by Set Features * commands. */ if (!status) nvme_update_keep_alive(ctrl, cmd); break; default: break; } break; default: break; } } int nvme_execute_passthru_rq(struct request *rq) { struct nvme_command *cmd = nvme_req(rq)->cmd; struct nvme_ctrl *ctrl = nvme_req(rq)->ctrl; struct nvme_ns *ns = rq->q->queuedata; struct gendisk *disk = ns ? ns->disk : NULL; u32 effects; int ret; effects = nvme_passthru_start(ctrl, ns, cmd->common.opcode); ret = nvme_execute_rq(disk, rq, false); if (effects) /* nothing to be done for zero cmd effects */ nvme_passthru_end(ctrl, effects, cmd, ret); return ret; } EXPORT_SYMBOL_NS_GPL(nvme_execute_passthru_rq, NVME_TARGET_PASSTHRU); /* * Recommended frequency for KATO commands per NVMe 1.4 section 7.12.1: * * The host should send Keep Alive commands at half of the Keep Alive Timeout * accounting for transport roundtrip times [..]. */ static void nvme_queue_keep_alive_work(struct nvme_ctrl *ctrl) { queue_delayed_work(nvme_wq, &ctrl->ka_work, ctrl->kato * HZ / 2); } 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) nvme_queue_keep_alive_work(ctrl); } 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; struct request *rq; if ((ctrl->ctratt & NVME_CTRL_ATTR_TBKAS) && comp_seen) { dev_dbg(ctrl->device, "reschedule traffic based keep-alive timer\n"); ctrl->comp_seen = false; nvme_queue_keep_alive_work(ctrl); return; } rq = nvme_alloc_request(ctrl->admin_q, &ctrl->ka_cmd, BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT); if (IS_ERR(rq)) { /* allocation failure, reset the controller */ dev_err(ctrl->device, "keep-alive failed: %ld\n", PTR_ERR(rq)); nvme_reset_ctrl(ctrl); return; } rq->timeout = ctrl->kato * HZ; rq->end_io_data = ctrl; blk_execute_rq_nowait(NULL, rq, 0, nvme_keep_alive_end_io); } static void nvme_start_keep_alive(struct nvme_ctrl *ctrl) { if (unlikely(ctrl->kato == 0)) return; nvme_queue_keep_alive_work(ctrl); } 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 void nvme_update_keep_alive(struct nvme_ctrl *ctrl, struct nvme_command *cmd) { unsigned int new_kato = DIV_ROUND_UP(le32_to_cpu(cmd->common.cdw11), 1000); dev_info(ctrl->device, "keep alive interval updated from %u ms to %u ms\n", ctrl->kato * 1000 / 2, new_kato * 1000 / 2); nvme_stop_keep_alive(ctrl); ctrl->kato = new_kato; nvme_start_keep_alive(ctrl); } /* * In NVMe 1.0 the CNS field was just a binary controller or namespace * flag, thus sending any new CNS opcodes has a big chance of not working. * Qemu unfortunately had that bug after reporting a 1.1 version compliance * (but not for any later version). */ static bool nvme_ctrl_limited_cns(struct nvme_ctrl *ctrl) { if (ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS) return ctrl->vs < NVME_VS(1, 2, 0); return ctrl->vs < NVME_VS(1, 1, 0); } 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_process_ns_desc(struct nvme_ctrl *ctrl, struct nvme_ns_ids *ids, struct nvme_ns_id_desc *cur, bool *csi_seen) { const char *warn_str = "ctrl returned bogus length:"; void *data = cur; switch (cur->nidt) { case NVME_NIDT_EUI64: if (cur->nidl != NVME_NIDT_EUI64_LEN) { dev_warn(ctrl->device, "%s %d for NVME_NIDT_EUI64\n", warn_str, cur->nidl); return -1; } memcpy(ids->eui64, data + sizeof(*cur), NVME_NIDT_EUI64_LEN); return NVME_NIDT_EUI64_LEN; case NVME_NIDT_NGUID: if (cur->nidl != NVME_NIDT_NGUID_LEN) { dev_warn(ctrl->device, "%s %d for NVME_NIDT_NGUID\n", warn_str, cur->nidl); return -1; } memcpy(ids->nguid, data + sizeof(*cur), NVME_NIDT_NGUID_LEN); return NVME_NIDT_NGUID_LEN; case NVME_NIDT_UUID: if (cur->nidl != NVME_NIDT_UUID_LEN) { dev_warn(ctrl->device, "%s %d for NVME_NIDT_UUID\n", warn_str, cur->nidl); return -1; } uuid_copy(&ids->uuid, data + sizeof(*cur)); return NVME_NIDT_UUID_LEN; case NVME_NIDT_CSI: if (cur->nidl != NVME_NIDT_CSI_LEN) { dev_warn(ctrl->device, "%s %d for NVME_NIDT_CSI\n", warn_str, cur->nidl); return -1; } memcpy(&ids->csi, data + sizeof(*cur), NVME_NIDT_CSI_LEN); *csi_seen = true; return NVME_NIDT_CSI_LEN; default: /* Skip unknown types */ return cur->nidl; } } static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid, struct nvme_ns_ids *ids) { struct nvme_command c = { }; bool csi_seen = false; int status, pos, len; void *data; if (ctrl->vs < NVME_VS(1, 3, 0) && !nvme_multi_css(ctrl)) return 0; if (ctrl->quirks & NVME_QUIRK_NO_NS_DESC_LIST) return 0; 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) { dev_warn(ctrl->device, "Identify Descriptors failed (nsid=%u, status=0x%x)\n", nsid, 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; len = nvme_process_ns_desc(ctrl, ids, cur, &csi_seen); if (len < 0) break; len += sizeof(*cur); } if (nvme_multi_css(ctrl) && !csi_seen) { dev_warn(ctrl->device, "Command set not reported for nsid:%d\n", nsid); status = -EINVAL; } free_data: kfree(data); return status; } static int nvme_identify_ns(struct nvme_ctrl *ctrl, unsigned nsid, struct nvme_ns_ids *ids, 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 -ENOMEM; error = nvme_submit_sync_cmd(ctrl->admin_q, &c, *id, sizeof(**id)); if (error) { dev_warn(ctrl->device, "Identify namespace failed (%d)\n", error); goto out_free_id; } error = NVME_SC_INVALID_NS | NVME_SC_DNR; if ((*id)->ncap == 0) /* namespace not allocated or attached */ goto out_free_id; if (ctrl->vs >= NVME_VS(1, 1, 0) && !memchr_inv(ids->eui64, 0, sizeof(ids->eui64))) memcpy(ids->eui64, (*id)->eui64, sizeof(ids->eui64)); if (ctrl->vs >= NVME_VS(1, 2, 0) && !memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) memcpy(ids->nguid, (*id)->nguid, sizeof(ids->nguid)); return 0; out_free_id: kfree(*id); return error; } static int nvme_features(struct nvme_ctrl *dev, u8 op, unsigned int fid, unsigned int dword11, void *buffer, size_t buflen, u32 *result) { union nvme_result res = { 0 }; struct nvme_command c = { }; int ret; c.features.opcode = op; 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); if (ret >= 0 && result) *result = le32_to_cpu(res.u32); return ret; } int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid, unsigned int dword11, void *buffer, size_t buflen, u32 *result) { return nvme_features(dev, nvme_admin_set_features, fid, dword11, buffer, buflen, result); } EXPORT_SYMBOL_GPL(nvme_set_features); int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid, unsigned int dword11, void *buffer, size_t buflen, u32 *result) { return nvme_features(dev, nvme_admin_get_features, fid, dword11, buffer, buflen, result); } EXPORT_SYMBOL_GPL(nvme_get_features); 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 | NVME_AEN_CFG_DISC_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); queue_work(nvme_wq, &ctrl->async_event_work); } static int nvme_ns_open(struct nvme_ns *ns) { /* should never be called due to GENHD_FL_HIDDEN */ if (WARN_ON_ONCE(nvme_ns_head_multipath(ns->head))) goto fail; if (!nvme_get_ns(ns)) 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_ns_release(struct nvme_ns *ns) { module_put(ns->ctrl->ops->module); nvme_put_ns(ns); } static int nvme_open(struct block_device *bdev, fmode_t mode) { return nvme_ns_open(bdev->bd_disk->private_data); } static void nvme_release(struct gendisk *disk, fmode_t mode) { nvme_ns_release(disk->private_data); } 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, u32 max_integrity_segments) { struct blk_integrity 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, max_integrity_segments); } #else static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type, u32 max_integrity_segments) { } #endif /* CONFIG_BLK_DEV_INTEGRITY */ static void nvme_config_discard(struct gendisk *disk, struct nvme_ns *ns) { struct nvme_ctrl *ctrl = ns->ctrl; struct request_queue *queue = disk->queue; u32 size = queue_logical_block_size(queue); if (ctrl->max_discard_sectors == 0) { 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, ctrl->max_discard_sectors); blk_queue_max_discard_segments(queue, ctrl->max_discard_segments); if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES) blk_queue_max_write_zeroes_sectors(queue, UINT_MAX); } 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 && a->csi == b->csi; } static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u32 *phys_bs, u32 *io_opt) { 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) { *phys_bs = ns->sws * (1 << ns->lba_shift); if (ns->sgs) *io_opt = *phys_bs * ns->sgs; } return 0; } static int nvme_configure_metadata(struct nvme_ns *ns, struct nvme_id_ns *id) { struct nvme_ctrl *ctrl = ns->ctrl; /* * The PI implementation requires the metadata size to be equal to the * t10 pi tuple size. */ ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms); if (ns->ms == sizeof(struct t10_pi_tuple)) ns->pi_type = id->dps & NVME_NS_DPS_PI_MASK; else ns->pi_type = 0; ns->features &= ~(NVME_NS_METADATA_SUPPORTED | NVME_NS_EXT_LBAS); if (!ns->ms || !(ctrl->ops->flags & NVME_F_METADATA_SUPPORTED)) return 0; if (ctrl->ops->flags & NVME_F_FABRICS) { /* * The NVMe over Fabrics specification only supports metadata as * part of the extended data LBA. We rely on HCA/HBA support to * remap the separate metadata buffer from the block layer. */ if (WARN_ON_ONCE(!(id->flbas & NVME_NS_FLBAS_META_EXT))) return -EINVAL; if (ctrl->max_integrity_segments) ns->features |= (NVME_NS_METADATA_SUPPORTED | NVME_NS_EXT_LBAS); } else { /* * For PCIe controllers, we can't easily remap the separate * metadata buffer from the block layer and thus require a * separate metadata buffer for block layer metadata/PI support. * We allow extended LBAs for the passthrough interface, though. */ if (id->flbas & NVME_NS_FLBAS_META_EXT) ns->features |= NVME_NS_EXT_LBAS; else ns->features |= NVME_NS_METADATA_SUPPORTED; } return 0; } static void nvme_set_queue_limits(struct nvme_ctrl *ctrl, struct request_queue *q) { bool vwc = ctrl->vwc & NVME_CTRL_VWC_PRESENT; if (ctrl->max_hw_sectors) { u32 max_segments = (ctrl->max_hw_sectors / (NVME_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)); } blk_queue_virt_boundary(q, NVME_CTRL_PAGE_SIZE - 1); blk_queue_dma_alignment(q, 7); blk_queue_write_cache(q, vwc, vwc); } static void nvme_update_disk_info(struct gendisk *disk, struct nvme_ns *ns, struct nvme_id_ns *id) { sector_t capacity = nvme_lba_to_sect(ns, le64_to_cpu(id->nsze)); unsigned short bs = 1 << ns->lba_shift; u32 atomic_bs, phys_bs, io_opt = 0; /* * The block layer can't support LBA sizes larger than the page size * yet, so catch this early and don't allow block I/O. */ if (ns->lba_shift > PAGE_SHIFT) { capacity = 0; bs = (1 << 9); } blk_integrity_unregister(disk); atomic_bs = phys_bs = bs; nvme_setup_streams_ns(ns->ctrl, ns, &phys_bs, &io_opt); if (id->nabo == 0) { /* * Bit 1 indicates whether NAWUPF is defined for this namespace * and whether it should be used instead of AWUPF. If NAWUPF == * 0 then AWUPF must be used instead. */ if (id->nsfeat & NVME_NS_FEAT_ATOMICS && id->nawupf) atomic_bs = (1 + le16_to_cpu(id->nawupf)) * bs; else atomic_bs = (1 + ns->ctrl->subsys->awupf) * bs; } if (id->nsfeat & NVME_NS_FEAT_IO_OPT) { /* NPWG = Namespace Preferred Write Granularity */ phys_bs = bs * (1 + le16_to_cpu(id->npwg)); /* NOWS = Namespace Optimal Write Size */ io_opt = bs * (1 + le16_to_cpu(id->nows)); } blk_queue_logical_block_size(disk->queue, bs); /* * Linux filesystems assume writing a single physical block is * an atomic operation. Hence limit the physical block size to the * value of the Atomic Write Unit Power Fail parameter. */ blk_queue_physical_block_size(disk->queue, min(phys_bs, atomic_bs)); blk_queue_io_min(disk->queue, phys_bs); blk_queue_io_opt(disk->queue, io_opt); /* * Register a metadata profile for PI, or the plain non-integrity NVMe * metadata masquerading as Type 0 if supported, otherwise reject block * I/O to namespaces with metadata except when the namespace supports * PI, as it can strip/insert in that case. */ if (ns->ms) { if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) && (ns->features & NVME_NS_METADATA_SUPPORTED)) nvme_init_integrity(disk, ns->ms, ns->pi_type, ns->ctrl->max_integrity_segments); else if (!nvme_ns_has_pi(ns)) capacity = 0; } set_capacity_and_notify(disk, capacity); nvme_config_discard(disk, ns); blk_queue_max_write_zeroes_sectors(disk->queue, ns->ctrl->max_zeroes_sectors); set_disk_ro(disk, (id->nsattr & NVME_NS_ATTR_RO) || test_bit(NVME_NS_FORCE_RO, &ns->flags)); } static inline bool nvme_first_scan(struct gendisk *disk) { /* nvme_alloc_ns() scans the disk prior to adding it */ return !disk_live(disk); } static void nvme_set_chunk_sectors(struct nvme_ns *ns, struct nvme_id_ns *id) { struct nvme_ctrl *ctrl = ns->ctrl; u32 iob; if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && is_power_of_2(ctrl->max_hw_sectors)) iob = ctrl->max_hw_sectors; else iob = nvme_lba_to_sect(ns, le16_to_cpu(id->noiob)); if (!iob) return; if (!is_power_of_2(iob)) { if (nvme_first_scan(ns->disk)) pr_warn("%s: ignoring unaligned IO boundary:%u\n", ns->disk->disk_name, iob); return; } if (blk_queue_is_zoned(ns->disk->queue)) { if (nvme_first_scan(ns->disk)) pr_warn("%s: ignoring zoned namespace IO boundary\n", ns->disk->disk_name); return; } blk_queue_chunk_sectors(ns->queue, iob); } static int nvme_update_ns_info(struct nvme_ns *ns, struct nvme_id_ns *id) { unsigned lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK; int ret; blk_mq_freeze_queue(ns->disk->queue); ns->lba_shift = id->lbaf[lbaf].ds; nvme_set_queue_limits(ns->ctrl, ns->queue); ret = nvme_configure_metadata(ns, id); if (ret) goto out_unfreeze; nvme_set_chunk_sectors(ns, id); nvme_update_disk_info(ns->disk, ns, id); if (ns->head->ids.csi == NVME_CSI_ZNS) { ret = nvme_update_zone_info(ns, lbaf); if (ret) goto out_unfreeze; } set_bit(NVME_NS_READY, &ns->flags); blk_mq_unfreeze_queue(ns->disk->queue); if (blk_queue_is_zoned(ns->queue)) { ret = nvme_revalidate_zones(ns); if (ret && !nvme_first_scan(ns->disk)) goto out; } if (nvme_ns_head_multipath(ns->head)) { blk_mq_freeze_queue(ns->head->disk->queue); nvme_update_disk_info(ns->head->disk, ns, id); nvme_mpath_revalidate_paths(ns); blk_stack_limits(&ns->head->disk->queue->limits, &ns->queue->limits, 0); disk_update_readahead(ns->head->disk); blk_mq_unfreeze_queue(ns->head->disk->queue); } return 0; out_unfreeze: blk_mq_unfreeze_queue(ns->disk->queue); out: /* * If probing fails due an unsupported feature, hide the block device, * but still allow other access. */ if (ret == -ENODEV) { ns->disk->flags |= GENHD_FL_HIDDEN; ret = 0; } 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_send_ns_head_pr_command(struct block_device *bdev, struct nvme_command *c, u8 data[16]) { struct nvme_ns_head *head = bdev->bd_disk->private_data; int srcu_idx = srcu_read_lock(&head->srcu); struct nvme_ns *ns = nvme_find_path(head); int ret = -EWOULDBLOCK; if (ns) { c->common.nsid = cpu_to_le32(ns->head->ns_id); ret = nvme_submit_sync_cmd(ns->queue, c, data, 16); } srcu_read_unlock(&head->srcu, srcu_idx); return ret; } static int nvme_send_ns_pr_command(struct nvme_ns *ns, struct nvme_command *c, u8 data[16]) { c->common.nsid = cpu_to_le32(ns->head->ns_id); return nvme_submit_sync_cmd(ns->queue, c, data, 16); } static int nvme_pr_command(struct block_device *bdev, u32 cdw10, u64 key, u64 sa_key, u8 op) { struct nvme_command c = { }; u8 data[16] = { 0, }; put_unaligned_le64(key, &data[0]); put_unaligned_le64(sa_key, &data[8]); c.common.opcode = op; c.common.cdw10 = cpu_to_le32(cdw10); if (IS_ENABLED(CONFIG_NVME_MULTIPATH) && bdev->bd_disk->fops == &nvme_ns_head_ops) return nvme_send_ns_head_pr_command(bdev, &c, data); return nvme_send_ns_pr_command(bdev->bd_disk->private_data, &c, data); } 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); } 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 = { }; 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, 0, NVME_QID_ANY, 1, 0); } EXPORT_SYMBOL_GPL(nvme_sec_submit); #endif /* CONFIG_BLK_SED_OPAL */ #ifdef CONFIG_BLK_DEV_ZONED static int nvme_report_zones(struct gendisk *disk, sector_t sector, unsigned int nr_zones, report_zones_cb cb, void *data) { return nvme_ns_report_zones(disk->private_data, sector, nr_zones, cb, data); } #else #define nvme_report_zones NULL #endif /* CONFIG_BLK_DEV_ZONED */ static const struct block_device_operations nvme_bdev_ops = { .owner = THIS_MODULE, .ioctl = nvme_ioctl, .open = nvme_open, .release = nvme_release, .getgeo = nvme_getgeo, .report_zones = nvme_report_zones, .pr_ops = &nvme_pr_ops, }; 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; usleep_range(1000, 2000); if (fatal_signal_pending(current)) return -EINTR; if (time_after(jiffies, timeout)) { dev_err(ctrl->device, "Device not ready; aborting %s, CSTS=0x%x\n", enabled ? "initialisation" : "reset", csts); 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) { 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, ctrl->cap, false); } EXPORT_SYMBOL_GPL(nvme_disable_ctrl); int nvme_enable_ctrl(struct nvme_ctrl *ctrl) { unsigned dev_page_min; int ret; ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &ctrl->cap); if (ret) { dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret); return ret; } dev_page_min = NVME_CAP_MPSMIN(ctrl->cap) + 12; if (NVME_CTRL_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 << NVME_CTRL_PAGE_SHIFT); return -ENODEV; } if (NVME_CAP_CSS(ctrl->cap) & NVME_CAP_CSS_CSI) ctrl->ctrl_config = NVME_CC_CSS_CSI; else ctrl->ctrl_config = NVME_CC_CSS_NVM; ctrl->ctrl_config |= (NVME_CTRL_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, 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 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; } /* * The function checks whether the given total (exlat + enlat) latency of * a power state allows the latter to be used as an APST transition target. * It does so by comparing the latency to the primary and secondary latency * tolerances defined by module params. If there's a match, the corresponding * timeout value is returned and the matching tolerance index (1 or 2) is * reported. */ static bool nvme_apst_get_transition_time(u64 total_latency, u64 *transition_time, unsigned *last_index) { if (total_latency <= apst_primary_latency_tol_us) { if (*last_index == 1) return false; *last_index = 1; *transition_time = apst_primary_timeout_ms; return true; } if (apst_secondary_timeout_ms && total_latency <= apst_secondary_latency_tol_us) { if (*last_index <= 2) return false; *last_index = 2; *transition_time = apst_secondary_timeout_ms; return true; } return false; } /* * APST (Autonomous Power State Transition) lets us program a table of power * state transitions that the controller will perform automatically. * * Depending on module params, one of the two supported techniques will be used: * * - If the parameters provide explicit timeouts and tolerances, they will be * used to build a table with up to 2 non-operational states to transition to. * The default parameter values were selected based on the values used by * Microsoft's and Intel's NVMe drivers. Yet, since we don't implement dynamic * regeneration of the APST table in the event of switching between external * and battery power, the timeouts and tolerances reflect a compromise * between values used by Microsoft for AC and battery scenarios. * - If not, we'll configure the table 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. */ static int nvme_configure_apst(struct nvme_ctrl *ctrl) { struct nvme_feat_auto_pst *table; unsigned apste = 0; u64 max_lat_us = 0; __le64 target = 0; int max_ps = -1; int state; int ret; unsigned last_lt_index = UINT_MAX; /* * 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. */ dev_dbg(ctrl->device, "APST disabled\n"); goto done; } /* * 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. It can be used as the APST idle target * for higher power states. */ if (apst_primary_timeout_ms && apst_primary_latency_tol_us) { if (!nvme_apst_get_transition_time(total_latency_us, &transition_ms, &last_lt_index)) continue; } else { 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; } 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); apste = 1; done: 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; if (ctrl->state == NVME_CTRL_LIVE) 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, }, { /* * This LiteON CL1-3D*-Q11 firmware version has a race * condition associated with actions related to suspend to idle * LiteON has resolved the problem in future firmware */ .vid = 0x14a4, .fr = "22301111", .quirks = NVME_QUIRK_SIMPLE_SUSPEND, } }; /* 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 device *dev) { struct nvme_subsystem *subsys = container_of(dev, struct nvme_subsystem, dev); if (subsys->instance >= 0) ida_simple_remove(&nvme_instance_ida, subsys->instance); kfree(subsys); } 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); /* * Fail matches for discovery subsystems. This results * in each discovery controller bound to a unique subsystem. * This avoids issues with validating controller values * that can only be true when there is a single unique subsystem. * There may be multiple and completely independent entities * that provide discovery controllers. */ if (!strcmp(subsysnqn, NVME_DISC_SUBSYS_NAME)) return NULL; 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 sysfs_emit(buf, "%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 sysfs_emit(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, #ifdef CONFIG_NVME_MULTIPATH &subsys_attr_iopolicy.attr, #endif NULL, }; static const 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 inline bool nvme_discovery_ctrl(struct nvme_ctrl *ctrl) { return ctrl->opts && ctrl->opts->discovery_nqn; } static bool nvme_validate_cntlid(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) { struct nvme_ctrl *tmp; lockdep_assert_held(&nvme_subsystems_lock); list_for_each_entry(tmp, &subsys->ctrls, subsys_entry) { if (nvme_state_terminal(tmp)) continue; if (tmp->cntlid == ctrl->cntlid) { dev_err(ctrl->device, "Duplicate cntlid %u with %s, rejecting\n", ctrl->cntlid, dev_name(tmp->device)); return false; } if ((id->cmic & NVME_CTRL_CMIC_MULTI_CTRL) || nvme_discovery_ctrl(ctrl)) continue; dev_err(ctrl->device, "Subsystem does not support multiple controllers\n"); return false; } return true; } 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; subsys->instance = -1; 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->awupf = le16_to_cpu(id->awupf); #ifdef CONFIG_NVME_MULTIPATH subsys->iopolicy = NVME_IOPOLICY_NUMA; #endif 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", ctrl->instance); device_initialize(&subsys->dev); mutex_lock(&nvme_subsystems_lock); found = __nvme_find_get_subsystem(subsys->subnqn); if (found) { put_device(&subsys->dev); subsys = found; if (!nvme_validate_cntlid(subsys, ctrl, id)) { ret = -EINVAL; goto out_put_subsystem; } } else { ret = device_add(&subsys->dev); if (ret) { dev_err(ctrl->device, "failed to register subsystem device.\n"); put_device(&subsys->dev); goto out_unlock; } ida_init(&subsys->ns_ida); list_add_tail(&subsys->entry, &nvme_subsystems); } ret = sysfs_create_link(&subsys->dev.kobj, &ctrl->device->kobj, dev_name(ctrl->device)); if (ret) { dev_err(ctrl->device, "failed to create sysfs link from subsystem.\n"); goto out_put_subsystem; } if (!found) subsys->instance = ctrl->instance; ctrl->subsys = subsys; list_add_tail(&ctrl->subsys_entry, &subsys->ctrls); mutex_unlock(&nvme_subsystems_lock); return 0; out_put_subsystem: nvme_put_subsystem(subsys); out_unlock: mutex_unlock(&nvme_subsystems_lock); return ret; } int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, u8 csi, void *log, size_t size, u64 offset) { struct nvme_command c = { }; u32 dwlen = nvme_bytes_to_numd(size); 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)); c.get_log_page.csi = csi; return nvme_submit_sync_cmd(ctrl->admin_q, &c, log, size); } static int nvme_get_effects_log(struct nvme_ctrl *ctrl, u8 csi, struct nvme_effects_log **log) { struct nvme_effects_log *cel = xa_load(&ctrl->cels, csi); int ret; if (cel) goto out; cel = kzalloc(sizeof(*cel), GFP_KERNEL); if (!cel) return -ENOMEM; ret = nvme_get_log(ctrl, 0x00, NVME_LOG_CMD_EFFECTS, 0, csi, cel, sizeof(*cel), 0); if (ret) { kfree(cel); return ret; } xa_store(&ctrl->cels, csi, cel, GFP_KERNEL); out: *log = cel; return 0; } static inline u32 nvme_mps_to_sectors(struct nvme_ctrl *ctrl, u32 units) { u32 page_shift = NVME_CAP_MPSMIN(ctrl->cap) + 12, val; if (check_shl_overflow(1U, units + page_shift - 9, &val)) return UINT_MAX; return val; } static int nvme_init_non_mdts_limits(struct nvme_ctrl *ctrl) { struct nvme_command c = { }; struct nvme_id_ctrl_nvm *id; int ret; if (ctrl->oncs & NVME_CTRL_ONCS_DSM) { ctrl->max_discard_sectors = UINT_MAX; ctrl->max_discard_segments = NVME_DSM_MAX_RANGES; } else { ctrl->max_discard_sectors = 0; ctrl->max_discard_segments = 0; } /* * Even though NVMe spec explicitly states that MDTS is not applicable * to the write-zeroes, we are cautious and limit the size to the * controllers max_hw_sectors value, which is based on the MDTS field * and possibly other limiting factors. */ if ((ctrl->oncs & NVME_CTRL_ONCS_WRITE_ZEROES) && !(ctrl->quirks & NVME_QUIRK_DISABLE_WRITE_ZEROES)) ctrl->max_zeroes_sectors = ctrl->max_hw_sectors; else ctrl->max_zeroes_sectors = 0; if (nvme_ctrl_limited_cns(ctrl)) return 0; id = kzalloc(sizeof(*id), GFP_KERNEL); if (!id) return 0; c.identify.opcode = nvme_admin_identify; c.identify.cns = NVME_ID_CNS_CS_CTRL; c.identify.csi = NVME_CSI_NVM; ret = nvme_submit_sync_cmd(ctrl->admin_q, &c, id, sizeof(*id)); if (ret) goto free_data; if (id->dmrl) ctrl->max_discard_segments = id->dmrl; if (id->dmrsl) ctrl->max_discard_sectors = le32_to_cpu(id->dmrsl); if (id->wzsl) ctrl->max_zeroes_sectors = nvme_mps_to_sectors(ctrl, id->wzsl); free_data: kfree(id); return ret; } static int nvme_init_identify(struct nvme_ctrl *ctrl) { struct nvme_id_ctrl *id; u32 max_hw_sectors; bool prev_apst_enabled; int ret; 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, NVME_CSI_NVM, &ctrl->effects); if (ret < 0) goto out_free; } if (!(ctrl->ops->flags & NVME_F_FABRICS)) ctrl->cntlid = le16_to_cpu(id->cntlid); if (!ctrl->identified) { unsigned 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_cpu(id->oncs); ctrl->mtfa = le16_to_cpu(id->mtfa); ctrl->oaes = le32_to_cpu(id->oaes); ctrl->wctemp = le16_to_cpu(id->wctemp); ctrl->cctemp = le16_to_cpu(id->cctemp); atomic_set(&ctrl->abort_limit, id->acl + 1); ctrl->vwc = id->vwc; if (id->mdts) max_hw_sectors = nvme_mps_to_sectors(ctrl, id->mdts); 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) / USEC_PER_SEC; 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)) { dev_err(ctrl->device, "Mismatching cntlid: Connect %u vs Identify " "%u, rejecting\n", ctrl->cntlid, le16_to_cpu(id->cntlid)); ret = -EINVAL; goto out_free; } if (!nvme_discovery_ctrl(ctrl) && !ctrl->kas) { dev_err(ctrl->device, "keep-alive support is mandatory for fabrics\n"); ret = -EINVAL; goto out_free; } } else { 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_identify(ctrl, id); if (ret < 0) goto out_free; 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); out_free: kfree(id); 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_ctrl_finish(struct nvme_ctrl *ctrl) { int ret; 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; } ctrl->sqsize = min_t(u16, NVME_CAP_MQES(ctrl->cap), ctrl->sqsize); if (ctrl->vs >= NVME_VS(1, 1, 0)) ctrl->subsystem = NVME_CAP_NSSRC(ctrl->cap); ret = nvme_init_identify(ctrl); if (ret) return ret; ret = nvme_init_non_mdts_limits(ctrl); if (ret < 0) return ret; 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; if (!ctrl->identified && !nvme_discovery_ctrl(ctrl)) { ret = nvme_hwmon_init(ctrl); if (ret < 0) return ret; } ctrl->identified = true; return 0; } EXPORT_SYMBOL_GPL(nvme_init_ctrl_finish); 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: break; default: return -EWOULDBLOCK; } nvme_get_ctrl(ctrl); if (!try_module_get(ctrl->ops->module)) { nvme_put_ctrl(ctrl); return -EINVAL; } file->private_data = ctrl; return 0; } static int nvme_dev_release(struct inode *inode, struct file *file) { struct nvme_ctrl *ctrl = container_of(inode->i_cdev, struct nvme_ctrl, cdev); module_put(ctrl->ops->module); nvme_put_ctrl(ctrl); return 0; } static const struct file_operations nvme_dev_fops = { .owner = THIS_MODULE, .open = nvme_dev_open, .release = nvme_dev_release, .unlocked_ioctl = nvme_dev_ioctl, .compat_ioctl = compat_ptr_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_bdev_ops) 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 sysfs_emit(buf, "uuid.%pU\n", &ids->uuid); if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) return sysfs_emit(buf, "eui.%16phN\n", ids->nguid); if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64))) return sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(buf, "%pU\n", ids->nguid); } return sysfs_emit(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 sysfs_emit(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 sysfs_emit(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_bdev_ops) /* 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, 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 sysfs_emit(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 sysfs_emit(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); nvme_show_int_function(queue_count); nvme_show_int_function(sqsize); nvme_show_int_function(kato); 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 sysfs_emit(buf, "%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_RESETTING] = "resetting", [NVME_CTRL_CONNECTING] = "connecting", [NVME_CTRL_DELETING] = "deleting", [NVME_CTRL_DELETING_NOIO]= "deleting (no IO)", [NVME_CTRL_DEAD] = "dead", }; if ((unsigned)ctrl->state < ARRAY_SIZE(state_name) && state_name[ctrl->state]) return sysfs_emit(buf, "%s\n", state_name[ctrl->state]); return sysfs_emit(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 sysfs_emit(buf, "%s\n", ctrl->subsys->subnqn); } static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL); static ssize_t nvme_sysfs_show_hostnqn(struct device *dev, struct device_attribute *attr, char *buf) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); return sysfs_emit(buf, "%s\n", ctrl->opts->host->nqn); } static DEVICE_ATTR(hostnqn, S_IRUGO, nvme_sysfs_show_hostnqn, NULL); static ssize_t nvme_sysfs_show_hostid(struct device *dev, struct device_attribute *attr, char *buf) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); return sysfs_emit(buf, "%pU\n", &ctrl->opts->host->id); } static DEVICE_ATTR(hostid, S_IRUGO, nvme_sysfs_show_hostid, 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 ssize_t nvme_ctrl_loss_tmo_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); struct nvmf_ctrl_options *opts = ctrl->opts; if (ctrl->opts->max_reconnects == -1) return sysfs_emit(buf, "off\n"); return sysfs_emit(buf, "%d\n", opts->max_reconnects * opts->reconnect_delay); } static ssize_t nvme_ctrl_loss_tmo_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); struct nvmf_ctrl_options *opts = ctrl->opts; int ctrl_loss_tmo, err; err = kstrtoint(buf, 10, &ctrl_loss_tmo); if (err) return -EINVAL; if (ctrl_loss_tmo < 0) opts->max_reconnects = -1; else opts->max_reconnects = DIV_ROUND_UP(ctrl_loss_tmo, opts->reconnect_delay); return count; } static DEVICE_ATTR(ctrl_loss_tmo, S_IRUGO | S_IWUSR, nvme_ctrl_loss_tmo_show, nvme_ctrl_loss_tmo_store); static ssize_t nvme_ctrl_reconnect_delay_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); if (ctrl->opts->reconnect_delay == -1) return sysfs_emit(buf, "off\n"); return sysfs_emit(buf, "%d\n", ctrl->opts->reconnect_delay); } static ssize_t nvme_ctrl_reconnect_delay_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); unsigned int v; int err; err = kstrtou32(buf, 10, &v); if (err) return err; ctrl->opts->reconnect_delay = v; return count; } static DEVICE_ATTR(reconnect_delay, S_IRUGO | S_IWUSR, nvme_ctrl_reconnect_delay_show, nvme_ctrl_reconnect_delay_store); static ssize_t nvme_ctrl_fast_io_fail_tmo_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); if (ctrl->opts->fast_io_fail_tmo == -1) return sysfs_emit(buf, "off\n"); return sysfs_emit(buf, "%d\n", ctrl->opts->fast_io_fail_tmo); } static ssize_t nvme_ctrl_fast_io_fail_tmo_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); struct nvmf_ctrl_options *opts = ctrl->opts; int fast_io_fail_tmo, err; err = kstrtoint(buf, 10, &fast_io_fail_tmo); if (err) return -EINVAL; if (fast_io_fail_tmo < 0) opts->fast_io_fail_tmo = -1; else opts->fast_io_fail_tmo = fast_io_fail_tmo; return count; } static DEVICE_ATTR(fast_io_fail_tmo, S_IRUGO | S_IWUSR, nvme_ctrl_fast_io_fail_tmo_show, nvme_ctrl_fast_io_fail_tmo_store); 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, &dev_attr_queue_count.attr, &dev_attr_sqsize.attr, &dev_attr_hostnqn.attr, &dev_attr_hostid.attr, &dev_attr_ctrl_loss_tmo.attr, &dev_attr_reconnect_delay.attr, &dev_attr_fast_io_fail_tmo.attr, &dev_attr_kato.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; if (a == &dev_attr_hostnqn.attr && !ctrl->opts) return 0; if (a == &dev_attr_hostid.attr && !ctrl->opts) return 0; if (a == &dev_attr_ctrl_loss_tmo.attr && !ctrl->opts) return 0; if (a == &dev_attr_reconnect_delay.attr && !ctrl->opts) return 0; if (a == &dev_attr_fast_io_fail_tmo.attr && !ctrl->opts) return 0; return a->mode; } static const 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) continue; if (!list_empty(&h->list) && nvme_tryget_ns_head(h)) 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) && nvme_ns_ids_equal(&new->ids, &h->ids)) return -EINVAL; } return 0; } static void nvme_cdev_rel(struct device *dev) { ida_simple_remove(&nvme_ns_chr_minor_ida, MINOR(dev->devt)); } void nvme_cdev_del(struct cdev *cdev, struct device *cdev_device) { cdev_device_del(cdev, cdev_device); put_device(cdev_device); } int nvme_cdev_add(struct cdev *cdev, struct device *cdev_device, const struct file_operations *fops, struct module *owner) { int minor, ret; minor = ida_simple_get(&nvme_ns_chr_minor_ida, 0, 0, GFP_KERNEL); if (minor < 0) return minor; cdev_device->devt = MKDEV(MAJOR(nvme_ns_chr_devt), minor); cdev_device->class = nvme_ns_chr_class; cdev_device->release = nvme_cdev_rel; device_initialize(cdev_device); cdev_init(cdev, fops); cdev->owner = owner; ret = cdev_device_add(cdev, cdev_device); if (ret) put_device(cdev_device); return ret; } static int nvme_ns_chr_open(struct inode *inode, struct file *file) { return nvme_ns_open(container_of(inode->i_cdev, struct nvme_ns, cdev)); } static int nvme_ns_chr_release(struct inode *inode, struct file *file) { nvme_ns_release(container_of(inode->i_cdev, struct nvme_ns, cdev)); return 0; } static const struct file_operations nvme_ns_chr_fops = { .owner = THIS_MODULE, .open = nvme_ns_chr_open, .release = nvme_ns_chr_release, .unlocked_ioctl = nvme_ns_chr_ioctl, .compat_ioctl = compat_ptr_ioctl, }; static int nvme_add_ns_cdev(struct nvme_ns *ns) { int ret; ns->cdev_device.parent = ns->ctrl->device; ret = dev_set_name(&ns->cdev_device, "ng%dn%d", ns->ctrl->instance, ns->head->instance); if (ret) return ret; return nvme_cdev_add(&ns->cdev, &ns->cdev_device, &nvme_ns_chr_fops, ns->ctrl->ops->module); } static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl, unsigned nsid, struct nvme_ns_ids *ids) { 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; head->ids = *ids; kref_init(&head->ref); ret = __nvme_check_ids(ctrl->subsys, head); if (ret) { dev_err(ctrl->device, "duplicate IDs for nsid %d\n", nsid); goto out_cleanup_srcu; } if (head->ids.csi) { ret = nvme_get_effects_log(ctrl, head->ids.csi, &head->effects); if (ret) goto out_cleanup_srcu; } else head->effects = ctrl->effects; 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: if (ret > 0) ret = blk_status_to_errno(nvme_error_status(ret)); return ERR_PTR(ret); } static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid, struct nvme_ns_ids *ids, bool is_shared) { struct nvme_ctrl *ctrl = ns->ctrl; struct nvme_ns_head *head = NULL; int ret = 0; mutex_lock(&ctrl->subsys->lock); head = nvme_find_ns_head(ctrl->subsys, nsid); if (!head) { head = nvme_alloc_ns_head(ctrl, nsid, ids); if (IS_ERR(head)) { ret = PTR_ERR(head); goto out_unlock; } head->shared = is_shared; } else { ret = -EINVAL; if (!is_shared || !head->shared) { dev_err(ctrl->device, "Duplicate unshared namespace %d\n", nsid); goto out_put_ns_head; } if (!nvme_ns_ids_equal(&head->ids, ids)) { dev_err(ctrl->device, "IDs don't match for shared namespace %d\n", nsid); goto out_put_ns_head; } } list_add_tail_rcu(&ns->siblings, &head->list); ns->head = head; mutex_unlock(&ctrl->subsys->lock); return 0; out_put_ns_head: nvme_put_ns_head(head); out_unlock: mutex_unlock(&ctrl->subsys->lock); return ret; } 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 (!nvme_get_ns(ns)) continue; ret = ns; break; } if (ns->head->ns_id > nsid) break; } up_read(&ctrl->namespaces_rwsem); return ret; } EXPORT_SYMBOL_NS_GPL(nvme_find_get_ns, NVME_TARGET_PASSTHRU); /* * Add the namespace to the controller list while keeping the list ordered. */ static void nvme_ns_add_to_ctrl_list(struct nvme_ns *ns) { struct nvme_ns *tmp; list_for_each_entry_reverse(tmp, &ns->ctrl->namespaces, list) { if (tmp->head->ns_id < ns->head->ns_id) { list_add(&ns->list, &tmp->list); return; } } list_add(&ns->list, &ns->ctrl->namespaces); } static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid, struct nvme_ns_ids *ids) { struct nvme_ns *ns; struct gendisk *disk; struct nvme_id_ns *id; int node = ctrl->numa_node; if (nvme_identify_ns(ctrl, nsid, ids, &id)) return; ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node); if (!ns) goto out_free_id; disk = blk_mq_alloc_disk(ctrl->tagset, ns); if (IS_ERR(disk)) goto out_free_ns; disk->fops = &nvme_bdev_ops; disk->private_data = ns; ns->disk = disk; ns->queue = disk->queue; if (ctrl->opts && ctrl->opts->data_digest) blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, ns->queue); 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->ctrl = ctrl; kref_init(&ns->kref); if (nvme_init_ns_head(ns, nsid, ids, id->nmic & NVME_NS_NMIC_SHARED)) goto out_cleanup_disk; /* * Without the multipath code enabled, multiple controller per * subsystems are visible as devices and thus we cannot use the * subsystem instance. */ if (!nvme_mpath_set_disk_name(ns, disk->disk_name, &disk->flags)) sprintf(disk->disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance); if (nvme_update_ns_info(ns, id)) goto out_unlink_ns; down_write(&ctrl->namespaces_rwsem); nvme_ns_add_to_ctrl_list(ns); up_write(&ctrl->namespaces_rwsem); nvme_get_ctrl(ctrl); if (device_add_disk(ctrl->device, ns->disk, nvme_ns_id_attr_groups)) goto out_cleanup_ns_from_list; if (!nvme_ns_head_multipath(ns->head)) nvme_add_ns_cdev(ns); nvme_mpath_add_disk(ns, id); nvme_fault_inject_init(&ns->fault_inject, ns->disk->disk_name); kfree(id); return; out_cleanup_ns_from_list: nvme_put_ctrl(ctrl); down_write(&ctrl->namespaces_rwsem); list_del_init(&ns->list); up_write(&ctrl->namespaces_rwsem); out_unlink_ns: mutex_lock(&ctrl->subsys->lock); list_del_rcu(&ns->siblings); if (list_empty(&ns->head->list)) list_del_init(&ns->head->entry); mutex_unlock(&ctrl->subsys->lock); nvme_put_ns_head(ns->head); out_cleanup_disk: blk_cleanup_disk(disk); out_free_ns: kfree(ns); out_free_id: kfree(id); } static void nvme_ns_remove(struct nvme_ns *ns) { bool last_path = false; if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags)) return; clear_bit(NVME_NS_READY, &ns->flags); set_capacity(ns->disk, 0); nvme_fault_inject_fini(&ns->fault_inject); mutex_lock(&ns->ctrl->subsys->lock); list_del_rcu(&ns->siblings); if (list_empty(&ns->head->list)) { list_del_init(&ns->head->entry); last_path = true; } mutex_unlock(&ns->ctrl->subsys->lock); /* guarantee not available in head->list */ synchronize_rcu(); /* wait for concurrent submissions */ if (nvme_mpath_clear_current_path(ns)) synchronize_srcu(&ns->head->srcu); if (!nvme_ns_head_multipath(ns->head)) nvme_cdev_del(&ns->cdev, &ns->cdev_device); del_gendisk(ns->disk); blk_cleanup_queue(ns->queue); down_write(&ns->ctrl->namespaces_rwsem); list_del_init(&ns->list); up_write(&ns->ctrl->namespaces_rwsem); if (last_path) nvme_mpath_shutdown_disk(ns->head); nvme_put_ns(ns); } static void nvme_ns_remove_by_nsid(struct nvme_ctrl *ctrl, u32 nsid) { struct nvme_ns *ns = nvme_find_get_ns(ctrl, nsid); if (ns) { nvme_ns_remove(ns); nvme_put_ns(ns); } } static void nvme_validate_ns(struct nvme_ns *ns, struct nvme_ns_ids *ids) { struct nvme_id_ns *id; int ret = NVME_SC_INVALID_NS | NVME_SC_DNR; if (test_bit(NVME_NS_DEAD, &ns->flags)) goto out; ret = nvme_identify_ns(ns->ctrl, ns->head->ns_id, ids, &id); if (ret) goto out; ret = NVME_SC_INVALID_NS | NVME_SC_DNR; if (!nvme_ns_ids_equal(&ns->head->ids, ids)) { dev_err(ns->ctrl->device, "identifiers changed for nsid %d\n", ns->head->ns_id); goto out_free_id; } ret = nvme_update_ns_info(ns, id); out_free_id: kfree(id); out: /* * Only remove the namespace if we got a fatal error back from the * device, otherwise ignore the error and just move on. * * TODO: we should probably schedule a delayed retry here. */ if (ret > 0 && (ret & NVME_SC_DNR)) nvme_ns_remove(ns); } static void nvme_validate_or_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) { struct nvme_ns_ids ids = { }; struct nvme_ns *ns; if (nvme_identify_ns_descs(ctrl, nsid, &ids)) return; ns = nvme_find_get_ns(ctrl, nsid); if (ns) { nvme_validate_ns(ns, &ids); nvme_put_ns(ns); return; } switch (ids.csi) { case NVME_CSI_NVM: nvme_alloc_ns(ctrl, nsid, &ids); break; case NVME_CSI_ZNS: if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED)) { dev_warn(ctrl->device, "nsid %u not supported without CONFIG_BLK_DEV_ZONED\n", nsid); break; } if (!nvme_multi_css(ctrl)) { dev_warn(ctrl->device, "command set not reported for nsid: %d\n", nsid); break; } nvme_alloc_ns(ctrl, nsid, &ids); break; default: dev_warn(ctrl->device, "unknown csi %u for nsid %u\n", ids.csi, nsid); break; } } 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) { const int nr_entries = NVME_IDENTIFY_DATA_SIZE / sizeof(__le32); __le32 *ns_list; u32 prev = 0; int ret = 0, i; if (nvme_ctrl_limited_cns(ctrl)) return -EOPNOTSUPP; ns_list = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL); if (!ns_list) return -ENOMEM; for (;;) { struct nvme_command cmd = { .identify.opcode = nvme_admin_identify, .identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST, .identify.nsid = cpu_to_le32(prev), }; ret = nvme_submit_sync_cmd(ctrl->admin_q, &cmd, ns_list, NVME_IDENTIFY_DATA_SIZE); if (ret) { dev_warn(ctrl->device, "Identify NS List failed (status=0x%x)\n", ret); goto free; } for (i = 0; i < nr_entries; i++) { u32 nsid = le32_to_cpu(ns_list[i]); if (!nsid) /* end of the list? */ goto out; nvme_validate_or_alloc_ns(ctrl, nsid); while (++prev < nsid) nvme_ns_remove_by_nsid(ctrl, prev); } } out: nvme_remove_invalid_namespaces(ctrl, prev); free: kfree(ns_list); return ret; } static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl) { struct nvme_id_ctrl *id; u32 nn, i; if (nvme_identify_ctrl(ctrl, &id)) return; nn = le32_to_cpu(id->nn); kfree(id); for (i = 1; i <= nn; i++) nvme_validate_or_alloc_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, NVME_CSI_NVM, 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); /* No tagset on a live ctrl means IO queues could not created */ if (ctrl->state != NVME_CTRL_LIVE || !ctrl->tagset) return; 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); } mutex_lock(&ctrl->scan_lock); if (nvme_scan_ns_list(ctrl) != 0) nvme_scan_ns_sequential(ctrl); mutex_unlock(&ctrl->scan_lock); } /* * 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); /* * make sure to requeue I/O to all namespaces as these * might result from the scan itself and must complete * for the scan_work to make progress */ nvme_mpath_clear_ctrl_paths(ctrl); /* 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); /* this is a no-op when called from the controller reset handler */ nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING_NOIO); 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 int nvme_class_uevent(struct device *dev, struct kobj_uevent_env *env) { struct nvme_ctrl *ctrl = container_of(dev, struct nvme_ctrl, ctrl_device); struct nvmf_ctrl_options *opts = ctrl->opts; int ret; ret = add_uevent_var(env, "NVME_TRTYPE=%s", ctrl->ops->name); if (ret) return ret; if (opts) { ret = add_uevent_var(env, "NVME_TRADDR=%s", opts->traddr); if (ret) return ret; ret = add_uevent_var(env, "NVME_TRSVCID=%s", opts->trsvcid ?: "none"); if (ret) return ret; ret = add_uevent_var(env, "NVME_HOST_TRADDR=%s", opts->host_traddr ?: "none"); if (ret) return ret; ret = add_uevent_var(env, "NVME_HOST_IFACE=%s", opts->host_iface ?: "none"); } return ret; } 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, NVME_LOG_FW_SLOT, 0, NVME_CSI_NVM, 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_try_sched_reset(ctrl); return; } msleep(100); } if (!nvme_change_ctrl_state(ctrl, 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; trace_nvme_async_event(ctrl, aer_notice_type); switch (aer_notice_type) { case NVME_AER_NOTICE_NS_CHANGED: set_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events); nvme_queue_scan(ctrl); break; case NVME_AER_NOTICE_FW_ACT_STARTING: /* * We are (ab)using the RESETTING state to prevent subsequent * recovery actions from interfering with the controller's * firmware activation. */ if (nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING)) queue_work(nvme_wq, &ctrl->fw_act_work); break; #ifdef CONFIG_NVME_MULTIPATH case NVME_AER_NOTICE_ANA: if (!ctrl->ana_log_buf) break; queue_work(nvme_wq, &ctrl->ana_work); break; #endif case NVME_AER_NOTICE_DISC_CHANGED: ctrl->aen_result = result; break; 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); nvme_stop_failfast_work(ctrl); flush_work(&ctrl->async_event_work); cancel_work_sync(&ctrl->fw_act_work); } EXPORT_SYMBOL_GPL(nvme_stop_ctrl); void nvme_start_ctrl(struct nvme_ctrl *ctrl) { nvme_start_keep_alive(ctrl); nvme_enable_aen(ctrl); if (ctrl->queue_count > 1) { nvme_queue_scan(ctrl); nvme_start_queues(ctrl); } } EXPORT_SYMBOL_GPL(nvme_start_ctrl); void nvme_uninit_ctrl(struct nvme_ctrl *ctrl) { nvme_hwmon_exit(ctrl); nvme_fault_inject_fini(&ctrl->fault_inject); dev_pm_qos_hide_latency_tolerance(ctrl->device); cdev_device_del(&ctrl->cdev, ctrl->device); nvme_put_ctrl(ctrl); } EXPORT_SYMBOL_GPL(nvme_uninit_ctrl); static void nvme_free_cels(struct nvme_ctrl *ctrl) { struct nvme_effects_log *cel; unsigned long i; xa_for_each(&ctrl->cels, i, cel) { xa_erase(&ctrl->cels, i); kfree(cel); } xa_destroy(&ctrl->cels); } 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; if (!subsys || ctrl->instance != subsys->instance) ida_simple_remove(&nvme_instance_ida, ctrl->instance); nvme_free_cels(ctrl); nvme_mpath_uninit(ctrl); __free_page(ctrl->discard_page); if (subsys) { mutex_lock(&nvme_subsystems_lock); list_del(&ctrl->subsys_entry); sysfs_remove_link(&subsys->dev.kobj, dev_name(ctrl->device)); mutex_unlock(&nvme_subsystems_lock); } 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; clear_bit(NVME_CTRL_FAILFAST_EXPIRED, &ctrl->flags); spin_lock_init(&ctrl->lock); mutex_init(&ctrl->scan_lock); INIT_LIST_HEAD(&ctrl->namespaces); xa_init(&ctrl->cels); init_rwsem(&ctrl->namespaces_rwsem); ctrl->dev = dev; ctrl->ops = ops; ctrl->quirks = quirks; ctrl->numa_node = NUMA_NO_NODE; 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_waitqueue_head(&ctrl->state_wq); INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work); INIT_DELAYED_WORK(&ctrl->failfast_work, nvme_failfast_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_ctrl_base_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; nvme_get_ctrl(ctrl); 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)); nvme_fault_inject_init(&ctrl->fault_inject, dev_name(ctrl->device)); nvme_mpath_init_ctrl(ctrl); return 0; out_free_name: nvme_put_ctrl(ctrl); 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); int 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); return timeout; } 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); void nvme_sync_io_queues(struct nvme_ctrl *ctrl) { struct nvme_ns *ns; down_read(&ctrl->namespaces_rwsem); list_for_each_entry(ns, &ctrl->namespaces, list) blk_sync_queue(ns->queue); up_read(&ctrl->namespaces_rwsem); } EXPORT_SYMBOL_GPL(nvme_sync_io_queues); void nvme_sync_queues(struct nvme_ctrl *ctrl) { nvme_sync_io_queues(ctrl); if (ctrl->admin_q) blk_sync_queue(ctrl->admin_q); } EXPORT_SYMBOL_GPL(nvme_sync_queues); struct nvme_ctrl *nvme_ctrl_from_file(struct file *file) { if (file->f_op != &nvme_dev_fops) return NULL; return file->private_data; } EXPORT_SYMBOL_NS_GPL(nvme_ctrl_from_file, NVME_TARGET_PASSTHRU); /* * Check we didn't inadvertently grow the command structure sizes: */ static inline void _nvme_check_size(void) { BUILD_BUG_ON(sizeof(struct nvme_common_command) != 64); BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64); BUILD_BUG_ON(sizeof(struct nvme_identify) != 64); BUILD_BUG_ON(sizeof(struct nvme_features) != 64); BUILD_BUG_ON(sizeof(struct nvme_download_firmware) != 64); BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64); BUILD_BUG_ON(sizeof(struct nvme_dsm_cmd) != 64); BUILD_BUG_ON(sizeof(struct nvme_write_zeroes_cmd) != 64); BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64); BUILD_BUG_ON(sizeof(struct nvme_get_log_page_command) != 64); BUILD_BUG_ON(sizeof(struct nvme_command) != 64); BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != NVME_IDENTIFY_DATA_SIZE); BUILD_BUG_ON(sizeof(struct nvme_id_ns) != NVME_IDENTIFY_DATA_SIZE); BUILD_BUG_ON(sizeof(struct nvme_id_ns_zns) != NVME_IDENTIFY_DATA_SIZE); BUILD_BUG_ON(sizeof(struct nvme_id_ctrl_zns) != NVME_IDENTIFY_DATA_SIZE); BUILD_BUG_ON(sizeof(struct nvme_id_ctrl_nvm) != NVME_IDENTIFY_DATA_SIZE); BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64); BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512); BUILD_BUG_ON(sizeof(struct nvme_dbbuf) != 64); BUILD_BUG_ON(sizeof(struct nvme_directive_cmd) != 64); } static int __init nvme_core_init(void) { int result = -ENOMEM; _nvme_check_size(); 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_ctrl_base_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_class->dev_uevent = nvme_class_uevent; nvme_subsys_class = class_create(THIS_MODULE, "nvme-subsystem"); if (IS_ERR(nvme_subsys_class)) { result = PTR_ERR(nvme_subsys_class); goto destroy_class; } result = alloc_chrdev_region(&nvme_ns_chr_devt, 0, NVME_MINORS, "nvme-generic"); if (result < 0) goto destroy_subsys_class; nvme_ns_chr_class = class_create(THIS_MODULE, "nvme-generic"); if (IS_ERR(nvme_ns_chr_class)) { result = PTR_ERR(nvme_ns_chr_class); goto unregister_generic_ns; } return 0; unregister_generic_ns: unregister_chrdev_region(nvme_ns_chr_devt, NVME_MINORS); destroy_subsys_class: class_destroy(nvme_subsys_class); destroy_class: class_destroy(nvme_class); unregister_chrdev: unregister_chrdev_region(nvme_ctrl_base_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; } static void __exit nvme_core_exit(void) { class_destroy(nvme_ns_chr_class); class_destroy(nvme_subsys_class); class_destroy(nvme_class); unregister_chrdev_region(nvme_ns_chr_devt, NVME_MINORS); unregister_chrdev_region(nvme_ctrl_base_chr_devt, NVME_MINORS); destroy_workqueue(nvme_delete_wq); destroy_workqueue(nvme_reset_wq); destroy_workqueue(nvme_wq); ida_destroy(&nvme_ns_chr_minor_ida); ida_destroy(&nvme_instance_ida); } MODULE_LICENSE("GPL"); MODULE_VERSION("1.0"); module_init(nvme_core_init); module_exit(nvme_core_exit);
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