| /* |
| * NVM Express device driver |
| * Copyright (c) 2011-2014, Intel Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| */ |
| |
| #include <linux/blkdev.h> |
| #include <linux/blk-mq.h> |
| #include <linux/delay.h> |
| #include <linux/errno.h> |
| #include <linux/hdreg.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/list_sort.h> |
| #include <linux/slab.h> |
| #include <linux/types.h> |
| #include <linux/pr.h> |
| #include <linux/ptrace.h> |
| #include <linux/nvme_ioctl.h> |
| #include <linux/t10-pi.h> |
| #include <linux/pm_qos.h> |
| #include <asm/unaligned.h> |
| |
| #define CREATE_TRACE_POINTS |
| #include "trace.h" |
| |
| #include "nvme.h" |
| #include "fabrics.h" |
| |
| #define NVME_MINORS (1U << MINORBITS) |
| |
| unsigned int admin_timeout = 60; |
| module_param(admin_timeout, uint, 0644); |
| MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands"); |
| EXPORT_SYMBOL_GPL(admin_timeout); |
| |
| unsigned int nvme_io_timeout = 30; |
| module_param_named(io_timeout, nvme_io_timeout, uint, 0644); |
| MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O"); |
| EXPORT_SYMBOL_GPL(nvme_io_timeout); |
| |
| static unsigned char shutdown_timeout = 5; |
| module_param(shutdown_timeout, byte, 0644); |
| MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown"); |
| |
| static u8 nvme_max_retries = 5; |
| module_param_named(max_retries, nvme_max_retries, byte, 0644); |
| MODULE_PARM_DESC(max_retries, "max number of retries a command may have"); |
| |
| static unsigned long default_ps_max_latency_us = 100000; |
| module_param(default_ps_max_latency_us, ulong, 0644); |
| MODULE_PARM_DESC(default_ps_max_latency_us, |
| "max power saving latency for new devices; use PM QOS to change per device"); |
| |
| static bool force_apst; |
| module_param(force_apst, bool, 0644); |
| MODULE_PARM_DESC(force_apst, "allow APST for newly enumerated devices even if quirked off"); |
| |
| static bool streams; |
| module_param(streams, bool, 0644); |
| MODULE_PARM_DESC(streams, "turn on support for Streams write directives"); |
| |
| /* |
| * nvme_wq - hosts nvme related works that are not reset or delete |
| * nvme_reset_wq - hosts nvme reset works |
| * nvme_delete_wq - hosts nvme delete works |
| * |
| * nvme_wq will host works such are scan, aen handling, fw activation, |
| * keep-alive error recovery, periodic reconnects etc. nvme_reset_wq |
| * runs reset works which also flush works hosted on nvme_wq for |
| * serialization purposes. nvme_delete_wq host controller deletion |
| * works which flush reset works for serialization. |
| */ |
| struct workqueue_struct *nvme_wq; |
| EXPORT_SYMBOL_GPL(nvme_wq); |
| |
| struct workqueue_struct *nvme_reset_wq; |
| EXPORT_SYMBOL_GPL(nvme_reset_wq); |
| |
| struct workqueue_struct *nvme_delete_wq; |
| EXPORT_SYMBOL_GPL(nvme_delete_wq); |
| |
| static DEFINE_IDA(nvme_subsystems_ida); |
| static LIST_HEAD(nvme_subsystems); |
| static DEFINE_MUTEX(nvme_subsystems_lock); |
| |
| static DEFINE_IDA(nvme_instance_ida); |
| static dev_t nvme_chr_devt; |
| static struct class *nvme_class; |
| static struct class *nvme_subsys_class; |
| |
| static void nvme_ns_remove(struct nvme_ns *ns); |
| static int nvme_revalidate_disk(struct gendisk *disk); |
| static void nvme_put_subsystem(struct nvme_subsystem *subsys); |
| static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl, |
| unsigned nsid); |
| |
| static void nvme_set_queue_dying(struct nvme_ns *ns) |
| { |
| /* |
| * Revalidating a dead namespace sets capacity to 0. This will end |
| * buffered writers dirtying pages that can't be synced. |
| */ |
| if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags)) |
| return; |
| blk_set_queue_dying(ns->queue); |
| /* Forcibly unquiesce queues to avoid blocking dispatch */ |
| blk_mq_unquiesce_queue(ns->queue); |
| /* |
| * Revalidate after unblocking dispatchers that may be holding bd_butex |
| */ |
| revalidate_disk(ns->disk); |
| } |
| |
| static void nvme_queue_scan(struct nvme_ctrl *ctrl) |
| { |
| /* |
| * Only new queue scan work when admin and IO queues are both alive |
| */ |
| if (ctrl->state == NVME_CTRL_LIVE) |
| queue_work(nvme_wq, &ctrl->scan_work); |
| } |
| |
| int nvme_reset_ctrl(struct nvme_ctrl *ctrl) |
| { |
| if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING)) |
| return -EBUSY; |
| if (!queue_work(nvme_reset_wq, &ctrl->reset_work)) |
| return -EBUSY; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(nvme_reset_ctrl); |
| |
| int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl) |
| { |
| int ret; |
| |
| ret = nvme_reset_ctrl(ctrl); |
| if (!ret) { |
| flush_work(&ctrl->reset_work); |
| if (ctrl->state != NVME_CTRL_LIVE && |
| ctrl->state != NVME_CTRL_ADMIN_ONLY) |
| ret = -ENETRESET; |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync); |
| |
| static void nvme_delete_ctrl_work(struct work_struct *work) |
| { |
| struct nvme_ctrl *ctrl = |
| container_of(work, struct nvme_ctrl, delete_work); |
| |
| dev_info(ctrl->device, |
| "Removing ctrl: NQN \"%s\"\n", ctrl->opts->subsysnqn); |
| |
| flush_work(&ctrl->reset_work); |
| nvme_stop_ctrl(ctrl); |
| nvme_remove_namespaces(ctrl); |
| ctrl->ops->delete_ctrl(ctrl); |
| nvme_uninit_ctrl(ctrl); |
| nvme_put_ctrl(ctrl); |
| } |
| |
| int nvme_delete_ctrl(struct nvme_ctrl *ctrl) |
| { |
| if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING)) |
| return -EBUSY; |
| if (!queue_work(nvme_delete_wq, &ctrl->delete_work)) |
| return -EBUSY; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(nvme_delete_ctrl); |
| |
| int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl) |
| { |
| int ret = 0; |
| |
| /* |
| * Keep a reference until the work is flushed since ->delete_ctrl |
| * can free the controller. |
| */ |
| nvme_get_ctrl(ctrl); |
| ret = nvme_delete_ctrl(ctrl); |
| if (!ret) |
| flush_work(&ctrl->delete_work); |
| nvme_put_ctrl(ctrl); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(nvme_delete_ctrl_sync); |
| |
| static inline bool nvme_ns_has_pi(struct nvme_ns *ns) |
| { |
| return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple); |
| } |
| |
| static blk_status_t nvme_error_status(struct request *req) |
| { |
| switch (nvme_req(req)->status & 0x7ff) { |
| case NVME_SC_SUCCESS: |
| return BLK_STS_OK; |
| case NVME_SC_CAP_EXCEEDED: |
| return BLK_STS_NOSPC; |
| case NVME_SC_LBA_RANGE: |
| return BLK_STS_TARGET; |
| case NVME_SC_BAD_ATTRIBUTES: |
| case NVME_SC_ONCS_NOT_SUPPORTED: |
| case NVME_SC_INVALID_OPCODE: |
| case NVME_SC_INVALID_FIELD: |
| case NVME_SC_INVALID_NS: |
| return BLK_STS_NOTSUPP; |
| case NVME_SC_WRITE_FAULT: |
| case NVME_SC_READ_ERROR: |
| case NVME_SC_UNWRITTEN_BLOCK: |
| case NVME_SC_ACCESS_DENIED: |
| case NVME_SC_READ_ONLY: |
| case NVME_SC_COMPARE_FAILED: |
| return BLK_STS_MEDIUM; |
| case NVME_SC_GUARD_CHECK: |
| case NVME_SC_APPTAG_CHECK: |
| case NVME_SC_REFTAG_CHECK: |
| case NVME_SC_INVALID_PI: |
| return BLK_STS_PROTECTION; |
| case NVME_SC_RESERVATION_CONFLICT: |
| return BLK_STS_NEXUS; |
| default: |
| return BLK_STS_IOERR; |
| } |
| } |
| |
| static inline bool nvme_req_needs_retry(struct request *req) |
| { |
| if (blk_noretry_request(req)) |
| return false; |
| if (nvme_req(req)->status & NVME_SC_DNR) |
| return false; |
| if (nvme_req(req)->retries >= nvme_max_retries) |
| return false; |
| return true; |
| } |
| |
| void nvme_complete_rq(struct request *req) |
| { |
| blk_status_t status = nvme_error_status(req); |
| |
| trace_nvme_complete_rq(req); |
| |
| if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) { |
| if ((req->cmd_flags & REQ_NVME_MPATH) && |
| blk_path_error(status)) { |
| nvme_failover_req(req); |
| return; |
| } |
| |
| if (!blk_queue_dying(req->q)) { |
| nvme_req(req)->retries++; |
| blk_mq_requeue_request(req, true); |
| return; |
| } |
| } |
| blk_mq_end_request(req, status); |
| } |
| EXPORT_SYMBOL_GPL(nvme_complete_rq); |
| |
| void nvme_cancel_request(struct request *req, void *data, bool reserved) |
| { |
| dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device, |
| "Cancelling I/O %d", req->tag); |
| |
| nvme_req(req)->status = NVME_SC_ABORT_REQ; |
| blk_mq_complete_request(req); |
| |
| } |
| EXPORT_SYMBOL_GPL(nvme_cancel_request); |
| |
| bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl, |
| enum nvme_ctrl_state new_state) |
| { |
| enum nvme_ctrl_state old_state; |
| unsigned long flags; |
| bool changed = false; |
| |
| spin_lock_irqsave(&ctrl->lock, flags); |
| |
| old_state = ctrl->state; |
| switch (new_state) { |
| case NVME_CTRL_ADMIN_ONLY: |
| switch (old_state) { |
| case NVME_CTRL_CONNECTING: |
| changed = true; |
| /* FALLTHRU */ |
| default: |
| break; |
| } |
| break; |
| case NVME_CTRL_LIVE: |
| switch (old_state) { |
| case NVME_CTRL_NEW: |
| case NVME_CTRL_RESETTING: |
| case NVME_CTRL_CONNECTING: |
| changed = true; |
| /* FALLTHRU */ |
| default: |
| break; |
| } |
| break; |
| case NVME_CTRL_RESETTING: |
| switch (old_state) { |
| case NVME_CTRL_NEW: |
| case NVME_CTRL_LIVE: |
| case NVME_CTRL_ADMIN_ONLY: |
| changed = true; |
| /* FALLTHRU */ |
| default: |
| break; |
| } |
| break; |
| case NVME_CTRL_CONNECTING: |
| switch (old_state) { |
| case NVME_CTRL_NEW: |
| case NVME_CTRL_RESETTING: |
| changed = true; |
| /* FALLTHRU */ |
| default: |
| break; |
| } |
| break; |
| case NVME_CTRL_DELETING: |
| switch (old_state) { |
| case NVME_CTRL_LIVE: |
| case NVME_CTRL_ADMIN_ONLY: |
| case NVME_CTRL_RESETTING: |
| case NVME_CTRL_CONNECTING: |
| changed = true; |
| /* FALLTHRU */ |
| default: |
| break; |
| } |
| break; |
| case NVME_CTRL_DEAD: |
| switch (old_state) { |
| case NVME_CTRL_DELETING: |
| changed = true; |
| /* FALLTHRU */ |
| default: |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| |
| if (changed) |
| ctrl->state = new_state; |
| |
| spin_unlock_irqrestore(&ctrl->lock, flags); |
| if (changed && ctrl->state == NVME_CTRL_LIVE) |
| nvme_kick_requeue_lists(ctrl); |
| return changed; |
| } |
| EXPORT_SYMBOL_GPL(nvme_change_ctrl_state); |
| |
| static void nvme_free_ns_head(struct kref *ref) |
| { |
| struct nvme_ns_head *head = |
| container_of(ref, struct nvme_ns_head, ref); |
| |
| nvme_mpath_remove_disk(head); |
| ida_simple_remove(&head->subsys->ns_ida, head->instance); |
| list_del_init(&head->entry); |
| cleanup_srcu_struct_quiesced(&head->srcu); |
| nvme_put_subsystem(head->subsys); |
| kfree(head); |
| } |
| |
| static void nvme_put_ns_head(struct nvme_ns_head *head) |
| { |
| kref_put(&head->ref, nvme_free_ns_head); |
| } |
| |
| static void nvme_free_ns(struct kref *kref) |
| { |
| struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref); |
| |
| if (ns->ndev) |
| nvme_nvm_unregister(ns); |
| |
| put_disk(ns->disk); |
| nvme_put_ns_head(ns->head); |
| nvme_put_ctrl(ns->ctrl); |
| kfree(ns); |
| } |
| |
| static void nvme_put_ns(struct nvme_ns *ns) |
| { |
| kref_put(&ns->kref, nvme_free_ns); |
| } |
| |
| static inline void nvme_clear_nvme_request(struct request *req) |
| { |
| if (!(req->rq_flags & RQF_DONTPREP)) { |
| nvme_req(req)->retries = 0; |
| nvme_req(req)->flags = 0; |
| req->rq_flags |= RQF_DONTPREP; |
| } |
| } |
| |
| struct request *nvme_alloc_request(struct request_queue *q, |
| struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid) |
| { |
| unsigned op = nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN; |
| struct request *req; |
| |
| if (qid == NVME_QID_ANY) { |
| req = blk_mq_alloc_request(q, op, flags); |
| } else { |
| req = blk_mq_alloc_request_hctx(q, op, flags, |
| qid ? qid - 1 : 0); |
| } |
| if (IS_ERR(req)) |
| return req; |
| |
| req->cmd_flags |= REQ_FAILFAST_DRIVER; |
| nvme_clear_nvme_request(req); |
| nvme_req(req)->cmd = cmd; |
| |
| return req; |
| } |
| EXPORT_SYMBOL_GPL(nvme_alloc_request); |
| |
| static int nvme_toggle_streams(struct nvme_ctrl *ctrl, bool enable) |
| { |
| struct nvme_command c; |
| |
| memset(&c, 0, sizeof(c)); |
| |
| c.directive.opcode = nvme_admin_directive_send; |
| c.directive.nsid = cpu_to_le32(NVME_NSID_ALL); |
| c.directive.doper = NVME_DIR_SND_ID_OP_ENABLE; |
| c.directive.dtype = NVME_DIR_IDENTIFY; |
| c.directive.tdtype = NVME_DIR_STREAMS; |
| c.directive.endir = enable ? NVME_DIR_ENDIR : 0; |
| |
| return nvme_submit_sync_cmd(ctrl->admin_q, &c, NULL, 0); |
| } |
| |
| static int nvme_disable_streams(struct nvme_ctrl *ctrl) |
| { |
| return nvme_toggle_streams(ctrl, false); |
| } |
| |
| static int nvme_enable_streams(struct nvme_ctrl *ctrl) |
| { |
| return nvme_toggle_streams(ctrl, true); |
| } |
| |
| static int nvme_get_stream_params(struct nvme_ctrl *ctrl, |
| struct streams_directive_params *s, u32 nsid) |
| { |
| struct nvme_command c; |
| |
| memset(&c, 0, sizeof(c)); |
| memset(s, 0, sizeof(*s)); |
| |
| c.directive.opcode = nvme_admin_directive_recv; |
| c.directive.nsid = cpu_to_le32(nsid); |
| c.directive.numd = cpu_to_le32((sizeof(*s) >> 2) - 1); |
| c.directive.doper = NVME_DIR_RCV_ST_OP_PARAM; |
| c.directive.dtype = NVME_DIR_STREAMS; |
| |
| return nvme_submit_sync_cmd(ctrl->admin_q, &c, s, sizeof(*s)); |
| } |
| |
| static int nvme_configure_directives(struct nvme_ctrl *ctrl) |
| { |
| struct streams_directive_params s; |
| int ret; |
| |
| if (!(ctrl->oacs & NVME_CTRL_OACS_DIRECTIVES)) |
| return 0; |
| if (!streams) |
| return 0; |
| |
| ret = nvme_enable_streams(ctrl); |
| if (ret) |
| return ret; |
| |
| ret = nvme_get_stream_params(ctrl, &s, NVME_NSID_ALL); |
| if (ret) |
| return ret; |
| |
| ctrl->nssa = le16_to_cpu(s.nssa); |
| if (ctrl->nssa < BLK_MAX_WRITE_HINTS - 1) { |
| dev_info(ctrl->device, "too few streams (%u) available\n", |
| ctrl->nssa); |
| nvme_disable_streams(ctrl); |
| return 0; |
| } |
| |
| ctrl->nr_streams = min_t(unsigned, ctrl->nssa, BLK_MAX_WRITE_HINTS - 1); |
| dev_info(ctrl->device, "Using %u streams\n", ctrl->nr_streams); |
| return 0; |
| } |
| |
| /* |
| * Check if 'req' has a write hint associated with it. If it does, assign |
| * a valid namespace stream to the write. |
| */ |
| static void nvme_assign_write_stream(struct nvme_ctrl *ctrl, |
| struct request *req, u16 *control, |
| u32 *dsmgmt) |
| { |
| enum rw_hint streamid = req->write_hint; |
| |
| if (streamid == WRITE_LIFE_NOT_SET || streamid == WRITE_LIFE_NONE) |
| streamid = 0; |
| else { |
| streamid--; |
| if (WARN_ON_ONCE(streamid > ctrl->nr_streams)) |
| return; |
| |
| *control |= NVME_RW_DTYPE_STREAMS; |
| *dsmgmt |= streamid << 16; |
| } |
| |
| if (streamid < ARRAY_SIZE(req->q->write_hints)) |
| req->q->write_hints[streamid] += blk_rq_bytes(req) >> 9; |
| } |
| |
| static inline void nvme_setup_flush(struct nvme_ns *ns, |
| struct nvme_command *cmnd) |
| { |
| memset(cmnd, 0, sizeof(*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_block_nr(ns, bio->bi_iter.bi_sector); |
| u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift; |
| |
| if (n < segments) { |
| range[n].cattr = cpu_to_le32(0); |
| range[n].nlb = cpu_to_le32(nlb); |
| range[n].slba = cpu_to_le64(slba); |
| } |
| n++; |
| } |
| |
| if (WARN_ON_ONCE(n != segments)) { |
| if (virt_to_page(range) == ns->ctrl->discard_page) |
| clear_bit_unlock(0, &ns->ctrl->discard_page_busy); |
| else |
| kfree(range); |
| return BLK_STS_IOERR; |
| } |
| |
| memset(cmnd, 0, sizeof(*cmnd)); |
| 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_rw(struct nvme_ns *ns, |
| struct request *req, struct nvme_command *cmnd) |
| { |
| struct nvme_ctrl *ctrl = ns->ctrl; |
| u16 control = 0; |
| u32 dsmgmt = 0; |
| |
| if (req->cmd_flags & REQ_FUA) |
| control |= NVME_RW_FUA; |
| if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD)) |
| control |= NVME_RW_LR; |
| |
| if (req->cmd_flags & REQ_RAHEAD) |
| dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH; |
| |
| memset(cmnd, 0, sizeof(*cmnd)); |
| cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read); |
| cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id); |
| cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); |
| cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1); |
| |
| if (req_op(req) == REQ_OP_WRITE && ctrl->nr_streams) |
| nvme_assign_write_stream(ctrl, req, &control, &dsmgmt); |
| |
| if (ns->ms) { |
| /* |
| * If formated with metadata, the block layer always provides a |
| * metadata buffer if CONFIG_BLK_DEV_INTEGRITY is enabled. Else |
| * we enable the PRACT bit for protection information or set the |
| * namespace capacity to zero to prevent any I/O. |
| */ |
| if (!blk_integrity_rq(req)) { |
| if (WARN_ON_ONCE(!nvme_ns_has_pi(ns))) |
| return BLK_STS_NOTSUPP; |
| control |= NVME_RW_PRINFO_PRACT; |
| } else if (req_op(req) == REQ_OP_WRITE) { |
| t10_pi_prepare(req, ns->pi_type); |
| } |
| |
| switch (ns->pi_type) { |
| case NVME_NS_DPS_PI_TYPE3: |
| control |= NVME_RW_PRINFO_PRCHK_GUARD; |
| break; |
| case NVME_NS_DPS_PI_TYPE1: |
| case NVME_NS_DPS_PI_TYPE2: |
| control |= NVME_RW_PRINFO_PRCHK_GUARD | |
| NVME_RW_PRINFO_PRCHK_REF; |
| cmnd->rw.reftag = cpu_to_le32(t10_pi_ref_tag(req)); |
| break; |
| } |
| } |
| |
| cmnd->rw.control = cpu_to_le16(control); |
| cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt); |
| return 0; |
| } |
| |
| void nvme_cleanup_cmd(struct request *req) |
| { |
| if (blk_integrity_rq(req) && req_op(req) == REQ_OP_READ && |
| nvme_req(req)->status == 0) { |
| struct nvme_ns *ns = req->rq_disk->private_data; |
| |
| t10_pi_complete(req, ns->pi_type, |
| blk_rq_bytes(req) >> ns->lba_shift); |
| } |
| if (req->rq_flags & RQF_SPECIAL_PAYLOAD) { |
| struct nvme_ns *ns = req->rq_disk->private_data; |
| struct page *page = req->special_vec.bv_page; |
| |
| if (page == ns->ctrl->discard_page) |
| clear_bit_unlock(0, &ns->ctrl->discard_page_busy); |
| else |
| kfree(page_address(page) + req->special_vec.bv_offset); |
| } |
| } |
| EXPORT_SYMBOL_GPL(nvme_cleanup_cmd); |
| |
| blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req, |
| struct nvme_command *cmd) |
| { |
| blk_status_t ret = BLK_STS_OK; |
| |
| nvme_clear_nvme_request(req); |
| |
| switch (req_op(req)) { |
| case REQ_OP_DRV_IN: |
| case REQ_OP_DRV_OUT: |
| memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd)); |
| break; |
| case REQ_OP_FLUSH: |
| nvme_setup_flush(ns, cmd); |
| break; |
| case REQ_OP_WRITE_ZEROES: |
| /* currently only aliased to deallocate for a few ctrls: */ |
| case REQ_OP_DISCARD: |
| ret = nvme_setup_discard(ns, req, cmd); |
| break; |
| case REQ_OP_READ: |
| case REQ_OP_WRITE: |
| ret = nvme_setup_rw(ns, req, cmd); |
| break; |
| default: |
| WARN_ON_ONCE(1); |
| return BLK_STS_IOERR; |
| } |
| |
| cmd->common.command_id = req->tag; |
| trace_nvme_setup_cmd(req, cmd); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(nvme_setup_cmd); |
| |
| /* |
| * 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; |
| |
| req = nvme_alloc_request(q, cmd, flags, qid); |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| req->timeout = timeout ? timeout : ADMIN_TIMEOUT; |
| |
| if (buffer && bufflen) { |
| ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL); |
| if (ret) |
| goto out; |
| } |
| |
| blk_execute_rq(req->q, NULL, req, at_head); |
| if (result) |
| *result = nvme_req(req)->result; |
| if (nvme_req(req)->flags & NVME_REQ_CANCELLED) |
| ret = -EINTR; |
| else |
| ret = nvme_req(req)->status; |
| out: |
| blk_mq_free_request(req); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd); |
| |
| int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, |
| void *buffer, unsigned bufflen) |
| { |
| return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0, |
| NVME_QID_ANY, 0, 0); |
| } |
| EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd); |
| |
| static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf, |
| unsigned len, u32 seed, bool write) |
| { |
| struct bio_integrity_payload *bip; |
| int ret = -ENOMEM; |
| void *buf; |
| |
| buf = kmalloc(len, GFP_KERNEL); |
| if (!buf) |
| goto out; |
| |
| ret = -EFAULT; |
| if (write && copy_from_user(buf, ubuf, len)) |
| goto out_free_meta; |
| |
| bip = bio_integrity_alloc(bio, GFP_KERNEL, 1); |
| if (IS_ERR(bip)) { |
| ret = PTR_ERR(bip); |
| goto out_free_meta; |
| } |
| |
| bip->bip_iter.bi_size = len; |
| bip->bip_iter.bi_sector = seed; |
| ret = bio_integrity_add_page(bio, virt_to_page(buf), len, |
| offset_in_page(buf)); |
| if (ret == len) |
| return buf; |
| ret = -ENOMEM; |
| out_free_meta: |
| kfree(buf); |
| out: |
| return ERR_PTR(ret); |
| } |
| |
| static int nvme_submit_user_cmd(struct request_queue *q, |
| struct nvme_command *cmd, void __user *ubuffer, |
| unsigned bufflen, void __user *meta_buffer, unsigned meta_len, |
| u32 meta_seed, u32 *result, unsigned timeout) |
| { |
| bool write = nvme_is_write(cmd); |
| struct nvme_ns *ns = q->queuedata; |
| struct gendisk *disk = ns ? ns->disk : NULL; |
| struct request *req; |
| struct bio *bio = NULL; |
| void *meta = NULL; |
| int ret; |
| |
| req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY); |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| req->timeout = timeout ? timeout : ADMIN_TIMEOUT; |
| nvme_req(req)->flags |= NVME_REQ_USERCMD; |
| |
| if (ubuffer && bufflen) { |
| ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, |
| GFP_KERNEL); |
| if (ret) |
| goto out; |
| bio = req->bio; |
| bio->bi_disk = disk; |
| if (disk && meta_buffer && meta_len) { |
| meta = nvme_add_user_metadata(bio, meta_buffer, meta_len, |
| meta_seed, write); |
| if (IS_ERR(meta)) { |
| ret = PTR_ERR(meta); |
| goto out_unmap; |
| } |
| req->cmd_flags |= REQ_INTEGRITY; |
| } |
| } |
| |
| blk_execute_rq(req->q, disk, req, 0); |
| if (nvme_req(req)->flags & NVME_REQ_CANCELLED) |
| ret = -EINTR; |
| else |
| ret = nvme_req(req)->status; |
| if (result) |
| *result = le32_to_cpu(nvme_req(req)->result.u32); |
| if (meta && !ret && !write) { |
| if (copy_to_user(meta_buffer, meta, meta_len)) |
| ret = -EFAULT; |
| } |
| kfree(meta); |
| out_unmap: |
| if (bio) |
| blk_rq_unmap_user(bio); |
| out: |
| blk_mq_free_request(req); |
| return ret; |
| } |
| |
| static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status) |
| { |
| struct nvme_ctrl *ctrl = rq->end_io_data; |
| unsigned long flags; |
| bool startka = false; |
| |
| blk_mq_free_request(rq); |
| |
| if (status) { |
| dev_err(ctrl->device, |
| "failed nvme_keep_alive_end_io error=%d\n", |
| status); |
| return; |
| } |
| |
| spin_lock_irqsave(&ctrl->lock, flags); |
| if (ctrl->state == NVME_CTRL_LIVE || |
| ctrl->state == NVME_CTRL_CONNECTING) |
| startka = true; |
| spin_unlock_irqrestore(&ctrl->lock, flags); |
| if (startka) |
| schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); |
| } |
| |
| static int nvme_keep_alive(struct nvme_ctrl *ctrl) |
| { |
| struct request *rq; |
| |
| rq = nvme_alloc_request(ctrl->admin_q, &ctrl->ka_cmd, BLK_MQ_REQ_RESERVED, |
| NVME_QID_ANY); |
| if (IS_ERR(rq)) |
| return PTR_ERR(rq); |
| |
| rq->timeout = ctrl->kato * HZ; |
| rq->end_io_data = ctrl; |
| |
| blk_execute_rq_nowait(rq->q, NULL, rq, 0, nvme_keep_alive_end_io); |
| |
| return 0; |
| } |
| |
| static void nvme_keep_alive_work(struct work_struct *work) |
| { |
| struct nvme_ctrl *ctrl = container_of(to_delayed_work(work), |
| struct nvme_ctrl, ka_work); |
| |
| if (nvme_keep_alive(ctrl)) { |
| /* allocation failure, reset the controller */ |
| dev_err(ctrl->device, "keep-alive failed\n"); |
| nvme_reset_ctrl(ctrl); |
| return; |
| } |
| } |
| |
| static void nvme_start_keep_alive(struct nvme_ctrl *ctrl) |
| { |
| if (unlikely(ctrl->kato == 0)) |
| return; |
| |
| schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); |
| } |
| |
| void nvme_stop_keep_alive(struct nvme_ctrl *ctrl) |
| { |
| if (unlikely(ctrl->kato == 0)) |
| return; |
| |
| cancel_delayed_work_sync(&ctrl->ka_work); |
| } |
| EXPORT_SYMBOL_GPL(nvme_stop_keep_alive); |
| |
| static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id) |
| { |
| struct nvme_command c = { }; |
| int error; |
| |
| /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ |
| c.identify.opcode = nvme_admin_identify; |
| c.identify.cns = NVME_ID_CNS_CTRL; |
| |
| *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL); |
| if (!*id) |
| return -ENOMEM; |
| |
| error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, |
| sizeof(struct nvme_id_ctrl)); |
| if (error) |
| kfree(*id); |
| return error; |
| } |
| |
| static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid, |
| struct nvme_ns_ids *ids) |
| { |
| struct nvme_command c = { }; |
| int status; |
| void *data; |
| int pos; |
| int len; |
| |
| c.identify.opcode = nvme_admin_identify; |
| c.identify.nsid = cpu_to_le32(nsid); |
| c.identify.cns = NVME_ID_CNS_NS_DESC_LIST; |
| |
| data = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL); |
| if (!data) |
| return -ENOMEM; |
| |
| status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data, |
| NVME_IDENTIFY_DATA_SIZE); |
| if (status) |
| goto free_data; |
| |
| for (pos = 0; pos < NVME_IDENTIFY_DATA_SIZE; pos += len) { |
| struct nvme_ns_id_desc *cur = data + pos; |
| |
| if (cur->nidl == 0) |
| break; |
| |
| switch (cur->nidt) { |
| case NVME_NIDT_EUI64: |
| if (cur->nidl != NVME_NIDT_EUI64_LEN) { |
| dev_warn(ctrl->device, |
| "ctrl returned bogus length: %d for NVME_NIDT_EUI64\n", |
| cur->nidl); |
| goto free_data; |
| } |
| len = NVME_NIDT_EUI64_LEN; |
| memcpy(ids->eui64, data + pos + sizeof(*cur), len); |
| break; |
| case NVME_NIDT_NGUID: |
| if (cur->nidl != NVME_NIDT_NGUID_LEN) { |
| dev_warn(ctrl->device, |
| "ctrl returned bogus length: %d for NVME_NIDT_NGUID\n", |
| cur->nidl); |
| goto free_data; |
| } |
| len = NVME_NIDT_NGUID_LEN; |
| memcpy(ids->nguid, data + pos + sizeof(*cur), len); |
| break; |
| case NVME_NIDT_UUID: |
| if (cur->nidl != NVME_NIDT_UUID_LEN) { |
| dev_warn(ctrl->device, |
| "ctrl returned bogus length: %d for NVME_NIDT_UUID\n", |
| cur->nidl); |
| goto free_data; |
| } |
| len = NVME_NIDT_UUID_LEN; |
| uuid_copy(&ids->uuid, data + pos + sizeof(*cur)); |
| break; |
| default: |
| /* Skip unnkown types */ |
| len = cur->nidl; |
| break; |
| } |
| |
| len += sizeof(*cur); |
| } |
| free_data: |
| kfree(data); |
| return status; |
| } |
| |
| static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list) |
| { |
| struct nvme_command c = { }; |
| |
| c.identify.opcode = nvme_admin_identify; |
| c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST; |
| c.identify.nsid = cpu_to_le32(nsid); |
| return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, |
| NVME_IDENTIFY_DATA_SIZE); |
| } |
| |
| static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl, |
| unsigned nsid) |
| { |
| struct nvme_id_ns *id; |
| struct nvme_command c = { }; |
| int error; |
| |
| /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ |
| c.identify.opcode = nvme_admin_identify; |
| c.identify.nsid = cpu_to_le32(nsid); |
| c.identify.cns = NVME_ID_CNS_NS; |
| |
| id = kmalloc(sizeof(*id), GFP_KERNEL); |
| if (!id) |
| return NULL; |
| |
| error = nvme_submit_sync_cmd(ctrl->admin_q, &c, id, sizeof(*id)); |
| if (error) { |
| dev_warn(ctrl->device, "Identify namespace failed\n"); |
| kfree(id); |
| return NULL; |
| } |
| |
| return id; |
| } |
| |
| static int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11, |
| void *buffer, size_t buflen, u32 *result) |
| { |
| struct nvme_command c; |
| union nvme_result res; |
| int ret; |
| |
| memset(&c, 0, sizeof(c)); |
| c.features.opcode = nvme_admin_set_features; |
| c.features.fid = cpu_to_le32(fid); |
| c.features.dword11 = cpu_to_le32(dword11); |
| |
| ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res, |
| buffer, buflen, 0, NVME_QID_ANY, 0, 0); |
| if (ret >= 0 && result) |
| *result = le32_to_cpu(res.u32); |
| return ret; |
| } |
| |
| int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count) |
| { |
| u32 q_count = (*count - 1) | ((*count - 1) << 16); |
| u32 result; |
| int status, nr_io_queues; |
| |
| status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0, |
| &result); |
| if (status < 0) |
| return status; |
| |
| /* |
| * Degraded controllers might return an error when setting the queue |
| * count. We still want to be able to bring them online and offer |
| * access to the admin queue, as that might be only way to fix them up. |
| */ |
| if (status > 0) { |
| dev_err(ctrl->device, "Could not set queue count (%d)\n", status); |
| *count = 0; |
| } else { |
| nr_io_queues = min(result & 0xffff, result >> 16) + 1; |
| *count = min(*count, nr_io_queues); |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(nvme_set_queue_count); |
| |
| #define NVME_AEN_SUPPORTED \ |
| (NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_FW_ACT | NVME_AEN_CFG_ANA_CHANGE) |
| |
| static void nvme_enable_aen(struct nvme_ctrl *ctrl) |
| { |
| u32 result, supported_aens = ctrl->oaes & NVME_AEN_SUPPORTED; |
| int status; |
| |
| if (!supported_aens) |
| return; |
| |
| status = nvme_set_features(ctrl, NVME_FEAT_ASYNC_EVENT, supported_aens, |
| NULL, 0, &result); |
| if (status) |
| dev_warn(ctrl->device, "Failed to configure AEN (cfg %x)\n", |
| supported_aens); |
| } |
| |
| static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) |
| { |
| struct nvme_user_io io; |
| struct nvme_command c; |
| unsigned length, meta_len; |
| void __user *metadata; |
| |
| if (copy_from_user(&io, uio, sizeof(io))) |
| return -EFAULT; |
| if (io.flags) |
| return -EINVAL; |
| |
| switch (io.opcode) { |
| case nvme_cmd_write: |
| case nvme_cmd_read: |
| case nvme_cmd_compare: |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| length = (io.nblocks + 1) << ns->lba_shift; |
| meta_len = (io.nblocks + 1) * ns->ms; |
| metadata = (void __user *)(uintptr_t)io.metadata; |
| |
| if (ns->ext) { |
| length += meta_len; |
| meta_len = 0; |
| } else if (meta_len) { |
| if ((io.metadata & 3) || !io.metadata) |
| return -EINVAL; |
| } |
| |
| memset(&c, 0, sizeof(c)); |
| c.rw.opcode = io.opcode; |
| c.rw.flags = io.flags; |
| c.rw.nsid = cpu_to_le32(ns->head->ns_id); |
| c.rw.slba = cpu_to_le64(io.slba); |
| c.rw.length = cpu_to_le16(io.nblocks); |
| c.rw.control = cpu_to_le16(io.control); |
| c.rw.dsmgmt = cpu_to_le32(io.dsmgmt); |
| c.rw.reftag = cpu_to_le32(io.reftag); |
| c.rw.apptag = cpu_to_le16(io.apptag); |
| c.rw.appmask = cpu_to_le16(io.appmask); |
| |
| return nvme_submit_user_cmd(ns->queue, &c, |
| (void __user *)(uintptr_t)io.addr, length, |
| metadata, meta_len, io.slba, NULL, 0); |
| } |
| |
| static u32 nvme_known_admin_effects(u8 opcode) |
| { |
| switch (opcode) { |
| case nvme_admin_format_nvm: |
| return NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC | |
| NVME_CMD_EFFECTS_CSE_MASK; |
| case nvme_admin_sanitize_nvm: |
| return NVME_CMD_EFFECTS_CSE_MASK; |
| default: |
| break; |
| } |
| return 0; |
| } |
| |
| static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns, |
| u8 opcode) |
| { |
| u32 effects = 0; |
| |
| if (ns) { |
| if (ctrl->effects) |
| effects = le32_to_cpu(ctrl->effects->iocs[opcode]); |
| if (effects & ~NVME_CMD_EFFECTS_CSUPP) |
| dev_warn(ctrl->device, |
| "IO command:%02x has unhandled effects:%08x\n", |
| opcode, effects); |
| return 0; |
| } |
| |
| if (ctrl->effects) |
| effects = le32_to_cpu(ctrl->effects->acs[opcode]); |
| else |
| effects = nvme_known_admin_effects(opcode); |
| |
| /* |
| * For simplicity, IO to all namespaces is quiesced even if the command |
| * effects say only one namespace is affected. |
| */ |
| if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) { |
| mutex_lock(&ctrl->scan_lock); |
| 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_update_formats(struct nvme_ctrl *ctrl) |
| { |
| struct nvme_ns *ns; |
| |
| down_read(&ctrl->namespaces_rwsem); |
| list_for_each_entry(ns, &ctrl->namespaces, list) |
| if (ns->disk && nvme_revalidate_disk(ns->disk)) |
| nvme_set_queue_dying(ns); |
| up_read(&ctrl->namespaces_rwsem); |
| |
| nvme_remove_invalid_namespaces(ctrl, NVME_NSID_ALL); |
| } |
| |
| static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects) |
| { |
| /* |
| * Revalidate LBA changes prior to unfreezing. This is necessary to |
| * prevent memory corruption if a logical block size was changed by |
| * this command. |
| */ |
| if (effects & NVME_CMD_EFFECTS_LBCC) |
| nvme_update_formats(ctrl); |
| if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) { |
| nvme_unfreeze(ctrl); |
| nvme_mpath_unfreeze(ctrl->subsys); |
| mutex_unlock(&ctrl->subsys->lock); |
| mutex_unlock(&ctrl->scan_lock); |
| } |
| if (effects & NVME_CMD_EFFECTS_CCC) |
| nvme_init_identify(ctrl); |
| if (effects & (NVME_CMD_EFFECTS_NIC | NVME_CMD_EFFECTS_NCC)) |
| nvme_queue_scan(ctrl); |
| } |
| |
| static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns, |
| struct nvme_passthru_cmd __user *ucmd) |
| { |
| struct nvme_passthru_cmd cmd; |
| struct nvme_command c; |
| unsigned timeout = 0; |
| u32 effects; |
| int status; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| if (copy_from_user(&cmd, ucmd, sizeof(cmd))) |
| return -EFAULT; |
| if (cmd.flags) |
| return -EINVAL; |
| |
| memset(&c, 0, sizeof(c)); |
| c.common.opcode = cmd.opcode; |
| c.common.flags = cmd.flags; |
| c.common.nsid = cpu_to_le32(cmd.nsid); |
| c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); |
| c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); |
| c.common.cdw10[0] = cpu_to_le32(cmd.cdw10); |
| c.common.cdw10[1] = cpu_to_le32(cmd.cdw11); |
| c.common.cdw10[2] = cpu_to_le32(cmd.cdw12); |
| c.common.cdw10[3] = cpu_to_le32(cmd.cdw13); |
| c.common.cdw10[4] = cpu_to_le32(cmd.cdw14); |
| c.common.cdw10[5] = cpu_to_le32(cmd.cdw15); |
| |
| if (cmd.timeout_ms) |
| timeout = msecs_to_jiffies(cmd.timeout_ms); |
| |
| effects = nvme_passthru_start(ctrl, ns, cmd.opcode); |
| status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, |
| (void __user *)(uintptr_t)cmd.addr, cmd.data_len, |
| (void __user *)(uintptr_t)cmd.metadata, cmd.metadata_len, |
| 0, &cmd.result, timeout); |
| nvme_passthru_end(ctrl, effects); |
| |
| if (status >= 0) { |
| if (put_user(cmd.result, &ucmd->result)) |
| return -EFAULT; |
| } |
| |
| return status; |
| } |
| |
| /* |
| * Issue ioctl requests on the first available path. Note that unlike normal |
| * block layer requests we will not retry failed request on another controller. |
| */ |
| static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk, |
| struct nvme_ns_head **head, int *srcu_idx) |
| { |
| #ifdef CONFIG_NVME_MULTIPATH |
| if (disk->fops == &nvme_ns_head_ops) { |
| struct nvme_ns *ns; |
| |
| *head = disk->private_data; |
| *srcu_idx = srcu_read_lock(&(*head)->srcu); |
| ns = nvme_find_path(*head); |
| if (!ns) |
| srcu_read_unlock(&(*head)->srcu, *srcu_idx); |
| return ns; |
| } |
| #endif |
| *head = NULL; |
| *srcu_idx = -1; |
| return disk->private_data; |
| } |
| |
| static void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx) |
| { |
| if (head) |
| srcu_read_unlock(&head->srcu, idx); |
| } |
| |
| static int nvme_ioctl(struct block_device *bdev, fmode_t mode, |
| unsigned int cmd, unsigned long arg) |
| { |
| struct nvme_ns_head *head = NULL; |
| void __user *argp = (void __user *)arg; |
| struct nvme_ns *ns; |
| int srcu_idx, ret; |
| |
| ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx); |
| if (unlikely(!ns)) |
| return -EWOULDBLOCK; |
| |
| /* |
| * Handle ioctls that apply to the controller instead of the namespace |
| * seperately and drop the ns SRCU reference early. This avoids a |
| * deadlock when deleting namespaces using the passthrough interface. |
| */ |
| if (cmd == NVME_IOCTL_ADMIN_CMD || is_sed_ioctl(cmd)) { |
| struct nvme_ctrl *ctrl = ns->ctrl; |
| |
| nvme_get_ctrl(ns->ctrl); |
| nvme_put_ns_from_disk(head, srcu_idx); |
| |
| if (cmd == NVME_IOCTL_ADMIN_CMD) |
| ret = nvme_user_cmd(ctrl, NULL, argp); |
| else |
| ret = sed_ioctl(ctrl->opal_dev, cmd, argp); |
| |
| nvme_put_ctrl(ctrl); |
| return ret; |
| } |
| |
| switch (cmd) { |
| case NVME_IOCTL_ID: |
| force_successful_syscall_return(); |
| ret = ns->head->ns_id; |
| break; |
| case NVME_IOCTL_IO_CMD: |
| ret = nvme_user_cmd(ns->ctrl, ns, argp); |
| break; |
| case NVME_IOCTL_SUBMIT_IO: |
| ret = nvme_submit_io(ns, argp); |
| break; |
| default: |
| if (ns->ndev) |
| ret = nvme_nvm_ioctl(ns, cmd, arg); |
| else |
| ret = -ENOTTY; |
| } |
| |
| nvme_put_ns_from_disk(head, srcu_idx); |
| return ret; |
| } |
| |
| static int nvme_open(struct block_device *bdev, fmode_t mode) |
| { |
| struct nvme_ns *ns = bdev->bd_disk->private_data; |
| |
| #ifdef CONFIG_NVME_MULTIPATH |
| /* should never be called due to GENHD_FL_HIDDEN */ |
| if (WARN_ON_ONCE(ns->head->disk)) |
| goto fail; |
| #endif |
| if (!kref_get_unless_zero(&ns->kref)) |
| goto fail; |
| if (!try_module_get(ns->ctrl->ops->module)) |
| goto fail_put_ns; |
| |
| return 0; |
| |
| fail_put_ns: |
| nvme_put_ns(ns); |
| fail: |
| return -ENXIO; |
| } |
| |
| static void nvme_release(struct gendisk *disk, fmode_t mode) |
| { |
| struct nvme_ns *ns = disk->private_data; |
| |
| module_put(ns->ctrl->ops->module); |
| nvme_put_ns(ns); |
| } |
| |
| static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| { |
| /* some standard values */ |
| geo->heads = 1 << 6; |
| geo->sectors = 1 << 5; |
| geo->cylinders = get_capacity(bdev->bd_disk) >> 11; |
| return 0; |
| } |
| |
| #ifdef CONFIG_BLK_DEV_INTEGRITY |
| static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type) |
| { |
| struct blk_integrity integrity; |
| |
| memset(&integrity, 0, sizeof(integrity)); |
| switch (pi_type) { |
| case NVME_NS_DPS_PI_TYPE3: |
| integrity.profile = &t10_pi_type3_crc; |
| integrity.tag_size = sizeof(u16) + sizeof(u32); |
| integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE; |
| break; |
| case NVME_NS_DPS_PI_TYPE1: |
| case NVME_NS_DPS_PI_TYPE2: |
| integrity.profile = &t10_pi_type1_crc; |
| integrity.tag_size = sizeof(u16); |
| integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE; |
| break; |
| default: |
| integrity.profile = NULL; |
| break; |
| } |
| integrity.tuple_size = ms; |
| blk_integrity_register(disk, &integrity); |
| blk_queue_max_integrity_segments(disk->queue, 1); |
| } |
| #else |
| static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type) |
| { |
| } |
| #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| static void nvme_set_chunk_size(struct nvme_ns *ns) |
| { |
| u32 chunk_size = (((u32)ns->noiob) << (ns->lba_shift - 9)); |
| blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size)); |
| } |
| |
| static void nvme_config_discard(struct nvme_ns *ns) |
| { |
| struct nvme_ctrl *ctrl = ns->ctrl; |
| struct request_queue *queue = ns->queue; |
| u32 size = queue_logical_block_size(queue); |
| |
| if (!(ctrl->oncs & NVME_CTRL_ONCS_DSM)) { |
| blk_queue_flag_clear(QUEUE_FLAG_DISCARD, queue); |
| return; |
| } |
| |
| if (ctrl->nr_streams && ns->sws && ns->sgs) |
| size *= ns->sws * ns->sgs; |
| |
| BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) < |
| NVME_DSM_MAX_RANGES); |
| |
| queue->limits.discard_alignment = 0; |
| queue->limits.discard_granularity = size; |
| |
| /* If discard is already enabled, don't reset queue limits */ |
| if (blk_queue_flag_test_and_set(QUEUE_FLAG_DISCARD, queue)) |
| return; |
| |
| blk_queue_max_discard_sectors(queue, UINT_MAX); |
| blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES); |
| |
| if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES) |
| blk_queue_max_write_zeroes_sectors(queue, UINT_MAX); |
| } |
| |
| static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid, |
| struct nvme_id_ns *id, struct nvme_ns_ids *ids) |
| { |
| memset(ids, 0, sizeof(*ids)); |
| |
| if (ctrl->vs >= NVME_VS(1, 1, 0)) |
| memcpy(ids->eui64, id->eui64, sizeof(id->eui64)); |
| if (ctrl->vs >= NVME_VS(1, 2, 0)) |
| memcpy(ids->nguid, id->nguid, sizeof(id->nguid)); |
| if (ctrl->vs >= NVME_VS(1, 3, 0)) { |
| /* Don't treat error as fatal we potentially |
| * already have a NGUID or EUI-64 |
| */ |
| if (nvme_identify_ns_descs(ctrl, nsid, ids)) |
| dev_warn(ctrl->device, |
| "%s: Identify Descriptors failed\n", __func__); |
| } |
| } |
| |
| static bool nvme_ns_ids_valid(struct nvme_ns_ids *ids) |
| { |
| return !uuid_is_null(&ids->uuid) || |
| memchr_inv(ids->nguid, 0, sizeof(ids->nguid)) || |
| memchr_inv(ids->eui64, 0, sizeof(ids->eui64)); |
| } |
| |
| static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b) |
| { |
| return uuid_equal(&a->uuid, &b->uuid) && |
| memcmp(&a->nguid, &b->nguid, sizeof(a->nguid)) == 0 && |
| memcmp(&a->eui64, &b->eui64, sizeof(a->eui64)) == 0; |
| } |
| |
| static void nvme_update_disk_info(struct gendisk *disk, |
| struct nvme_ns *ns, struct nvme_id_ns *id) |
| { |
| sector_t capacity = le64_to_cpup(&id->nsze) << (ns->lba_shift - 9); |
| unsigned short bs = 1 << ns->lba_shift; |
| |
| if (ns->lba_shift > PAGE_SHIFT) { |
| /* unsupported block size, set capacity to 0 later */ |
| bs = (1 << 9); |
| } |
| blk_mq_freeze_queue(disk->queue); |
| blk_integrity_unregister(disk); |
| |
| blk_queue_logical_block_size(disk->queue, bs); |
| blk_queue_physical_block_size(disk->queue, bs); |
| blk_queue_io_min(disk->queue, bs); |
| |
| if (ns->ms && !ns->ext && |
| (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED)) |
| nvme_init_integrity(disk, ns->ms, ns->pi_type); |
| if ((ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk)) || |
| ns->lba_shift > PAGE_SHIFT) |
| capacity = 0; |
| |
| set_capacity(disk, capacity); |
| nvme_config_discard(ns); |
| |
| if (id->nsattr & (1 << 0)) |
| set_disk_ro(disk, true); |
| else |
| set_disk_ro(disk, false); |
| |
| blk_mq_unfreeze_queue(disk->queue); |
| } |
| |
| static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id) |
| { |
| struct nvme_ns *ns = disk->private_data; |
| |
| /* |
| * If identify namespace failed, use default 512 byte block size so |
| * block layer can use before failing read/write for 0 capacity. |
| */ |
| ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds; |
| if (ns->lba_shift == 0) |
| ns->lba_shift = 9; |
| ns->noiob = le16_to_cpu(id->noiob); |
| ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms); |
| ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT); |
| /* the PI implementation requires metadata equal t10 pi tuple size */ |
| if (ns->ms == sizeof(struct t10_pi_tuple)) |
| ns->pi_type = id->dps & NVME_NS_DPS_PI_MASK; |
| else |
| ns->pi_type = 0; |
| |
| if (ns->noiob) |
| nvme_set_chunk_size(ns); |
| nvme_update_disk_info(disk, ns, id); |
| if (ns->ndev) |
| nvme_nvm_update_nvm_info(ns); |
| #ifdef CONFIG_NVME_MULTIPATH |
| if (ns->head->disk) { |
| nvme_update_disk_info(ns->head->disk, ns, id); |
| blk_queue_stack_limits(ns->head->disk->queue, ns->queue); |
| revalidate_disk(ns->head->disk); |
| } |
| #endif |
| } |
| |
| static int nvme_revalidate_disk(struct gendisk *disk) |
| { |
| struct nvme_ns *ns = disk->private_data; |
| struct nvme_ctrl *ctrl = ns->ctrl; |
| struct nvme_id_ns *id; |
| struct nvme_ns_ids ids; |
| int ret = 0; |
| |
| if (test_bit(NVME_NS_DEAD, &ns->flags)) { |
| set_capacity(disk, 0); |
| return -ENODEV; |
| } |
| |
| id = nvme_identify_ns(ctrl, ns->head->ns_id); |
| if (!id) |
| return -ENODEV; |
| |
| if (id->ncap == 0) { |
| ret = -ENODEV; |
| goto out; |
| } |
| |
| __nvme_revalidate_disk(disk, id); |
| nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids); |
| if (!nvme_ns_ids_equal(&ns->head->ids, &ids)) { |
| dev_err(ctrl->device, |
| "identifiers changed for nsid %d\n", ns->head->ns_id); |
| ret = -ENODEV; |
| } |
| |
| out: |
| kfree(id); |
| return ret; |
| } |
| |
| static char nvme_pr_type(enum pr_type type) |
| { |
| switch (type) { |
| case PR_WRITE_EXCLUSIVE: |
| return 1; |
| case PR_EXCLUSIVE_ACCESS: |
| return 2; |
| case PR_WRITE_EXCLUSIVE_REG_ONLY: |
| return 3; |
| case PR_EXCLUSIVE_ACCESS_REG_ONLY: |
| return 4; |
| case PR_WRITE_EXCLUSIVE_ALL_REGS: |
| return 5; |
| case PR_EXCLUSIVE_ACCESS_ALL_REGS: |
| return 6; |
| default: |
| return 0; |
| } |
| }; |
| |
| static int nvme_pr_command(struct block_device *bdev, u32 cdw10, |
| u64 key, u64 sa_key, u8 op) |
| { |
| struct nvme_ns_head *head = NULL; |
| struct nvme_ns *ns; |
| struct nvme_command c; |
| int srcu_idx, ret; |
| u8 data[16] = { 0, }; |
| |
| ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx); |
| if (unlikely(!ns)) |
| return -EWOULDBLOCK; |
| |
| put_unaligned_le64(key, &data[0]); |
| put_unaligned_le64(sa_key, &data[8]); |
| |
| memset(&c, 0, sizeof(c)); |
| c.common.opcode = op; |
| c.common.nsid = cpu_to_le32(ns->head->ns_id); |
| c.common.cdw10[0] = cpu_to_le32(cdw10); |
| |
| ret = nvme_submit_sync_cmd(ns->queue, &c, data, 16); |
| nvme_put_ns_from_disk(head, srcu_idx); |
| return ret; |
| } |
| |
| static int nvme_pr_register(struct block_device *bdev, u64 old, |
| u64 new, unsigned flags) |
| { |
| u32 cdw10; |
| |
| if (flags & ~PR_FL_IGNORE_KEY) |
| return -EOPNOTSUPP; |
| |
| cdw10 = old ? 2 : 0; |
| cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0; |
| cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */ |
| return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register); |
| } |
| |
| static int nvme_pr_reserve(struct block_device *bdev, u64 key, |
| enum pr_type type, unsigned flags) |
| { |
| u32 cdw10; |
| |
| if (flags & ~PR_FL_IGNORE_KEY) |
| return -EOPNOTSUPP; |
| |
| cdw10 = nvme_pr_type(type) << 8; |
| cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0); |
| return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire); |
| } |
| |
| static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new, |
| enum pr_type type, bool abort) |
| { |
| u32 cdw10 = nvme_pr_type(type) << 8 | (abort ? 2 : 1); |
| return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire); |
| } |
| |
| static int nvme_pr_clear(struct block_device *bdev, u64 key) |
| { |
| u32 cdw10 = 1 | (key ? 1 << 3 : 0); |
| return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register); |
| } |
| |
| static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type) |
| { |
| u32 cdw10 = nvme_pr_type(type) << 8 | (key ? 1 << 3 : 0); |
| return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release); |
| } |
| |
| static const struct pr_ops nvme_pr_ops = { |
| .pr_register = nvme_pr_register, |
| .pr_reserve = nvme_pr_reserve, |
| .pr_release = nvme_pr_release, |
| .pr_preempt = nvme_pr_preempt, |
| .pr_clear = nvme_pr_clear, |
| }; |
| |
| #ifdef CONFIG_BLK_SED_OPAL |
| int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len, |
| bool send) |
| { |
| struct nvme_ctrl *ctrl = data; |
| struct nvme_command cmd; |
| |
| memset(&cmd, 0, sizeof(cmd)); |
| if (send) |
| cmd.common.opcode = nvme_admin_security_send; |
| else |
| cmd.common.opcode = nvme_admin_security_recv; |
| cmd.common.nsid = 0; |
| cmd.common.cdw10[0] = cpu_to_le32(((u32)secp) << 24 | ((u32)spsp) << 8); |
| cmd.common.cdw10[1] = cpu_to_le32(len); |
| |
| return __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, NULL, buffer, len, |
| ADMIN_TIMEOUT, NVME_QID_ANY, 1, 0); |
| } |
| EXPORT_SYMBOL_GPL(nvme_sec_submit); |
| #endif /* CONFIG_BLK_SED_OPAL */ |
| |
| static const struct block_device_operations nvme_fops = { |
| .owner = THIS_MODULE, |
| .ioctl = nvme_ioctl, |
| .compat_ioctl = nvme_ioctl, |
| .open = nvme_open, |
| .release = nvme_release, |
| .getgeo = nvme_getgeo, |
| .revalidate_disk= nvme_revalidate_disk, |
| .pr_ops = &nvme_pr_ops, |
| }; |
| |
| #ifdef CONFIG_NVME_MULTIPATH |
| static int nvme_ns_head_open(struct block_device *bdev, fmode_t mode) |
| { |
| struct nvme_ns_head *head = bdev->bd_disk->private_data; |
| |
| if (!kref_get_unless_zero(&head->ref)) |
| return -ENXIO; |
| return 0; |
| } |
| |
| static void nvme_ns_head_release(struct gendisk *disk, fmode_t mode) |
| { |
| nvme_put_ns_head(disk->private_data); |
| } |
| |
| const struct block_device_operations nvme_ns_head_ops = { |
| .owner = THIS_MODULE, |
| .open = nvme_ns_head_open, |
| .release = nvme_ns_head_release, |
| .ioctl = nvme_ioctl, |
| .compat_ioctl = nvme_ioctl, |
| .getgeo = nvme_getgeo, |
| .pr_ops = &nvme_pr_ops, |
| }; |
| #endif /* CONFIG_NVME_MULTIPATH */ |
| |
| static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled) |
| { |
| unsigned long timeout = |
| ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies; |
| u32 csts, bit = enabled ? NVME_CSTS_RDY : 0; |
| int ret; |
| |
| while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) { |
| if (csts == ~0) |
| return -ENODEV; |
| if ((csts & NVME_CSTS_RDY) == bit) |
| break; |
| |
| msleep(100); |
| if (fatal_signal_pending(current)) |
| return -EINTR; |
| if (time_after(jiffies, timeout)) { |
| dev_err(ctrl->device, |
| "Device not ready; aborting %s\n", enabled ? |
| "initialisation" : "reset"); |
| return -ENODEV; |
| } |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * If the device has been passed off to us in an enabled state, just clear |
| * the enabled bit. The spec says we should set the 'shutdown notification |
| * bits', but doing so may cause the device to complete commands to the |
| * admin queue ... and we don't know what memory that might be pointing at! |
| */ |
| int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap) |
| { |
| int ret; |
| |
| ctrl->ctrl_config &= ~NVME_CC_SHN_MASK; |
| ctrl->ctrl_config &= ~NVME_CC_ENABLE; |
| |
| ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); |
| if (ret) |
| return ret; |
| |
| if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY) |
| msleep(NVME_QUIRK_DELAY_AMOUNT); |
| |
| return nvme_wait_ready(ctrl, cap, false); |
| } |
| EXPORT_SYMBOL_GPL(nvme_disable_ctrl); |
| |
| int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap) |
| { |
| /* |
| * Default to a 4K page size, with the intention to update this |
| * path in the future to accomodate architectures with differing |
| * kernel and IO page sizes. |
| */ |
| unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12; |
| int ret; |
| |
| if (page_shift < dev_page_min) { |
| dev_err(ctrl->device, |
| "Minimum device page size %u too large for host (%u)\n", |
| 1 << dev_page_min, 1 << page_shift); |
| return -ENODEV; |
| } |
| |
| ctrl->page_size = 1 << page_shift; |
| |
| ctrl->ctrl_config = NVME_CC_CSS_NVM; |
| ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT; |
| ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE; |
| ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES; |
| ctrl->ctrl_config |= NVME_CC_ENABLE; |
| |
| ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); |
| if (ret) |
| return ret; |
| return nvme_wait_ready(ctrl, cap, true); |
| } |
| EXPORT_SYMBOL_GPL(nvme_enable_ctrl); |
| |
| int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl) |
| { |
| unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ); |
| u32 csts; |
| int ret; |
| |
| ctrl->ctrl_config &= ~NVME_CC_SHN_MASK; |
| ctrl->ctrl_config |= NVME_CC_SHN_NORMAL; |
| |
| ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); |
| if (ret) |
| return ret; |
| |
| while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) { |
| if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT) |
| break; |
| |
| msleep(100); |
| if (fatal_signal_pending(current)) |
| return -EINTR; |
| if (time_after(jiffies, timeout)) { |
| dev_err(ctrl->device, |
| "Device shutdown incomplete; abort shutdown\n"); |
| return -ENODEV; |
| } |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl); |
| |
| static void nvme_set_queue_limits(struct nvme_ctrl *ctrl, |
| struct request_queue *q) |
| { |
| bool vwc = false; |
| |
| if (ctrl->max_hw_sectors) { |
| u32 max_segments = |
| (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1; |
| |
| max_segments = min_not_zero(max_segments, ctrl->max_segments); |
| blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors); |
| blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX)); |
| } |
| if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && |
| is_power_of_2(ctrl->max_hw_sectors)) |
| blk_queue_chunk_sectors(q, ctrl->max_hw_sectors); |
| blk_queue_virt_boundary(q, ctrl->page_size - 1); |
| if (ctrl->vwc & NVME_CTRL_VWC_PRESENT) |
| vwc = true; |
| blk_queue_write_cache(q, vwc, vwc); |
| } |
| |
| static int nvme_configure_timestamp(struct nvme_ctrl *ctrl) |
| { |
| __le64 ts; |
| int ret; |
| |
| if (!(ctrl->oncs & NVME_CTRL_ONCS_TIMESTAMP)) |
| return 0; |
| |
| ts = cpu_to_le64(ktime_to_ms(ktime_get_real())); |
| ret = nvme_set_features(ctrl, NVME_FEAT_TIMESTAMP, 0, &ts, sizeof(ts), |
| NULL); |
| if (ret) |
| dev_warn_once(ctrl->device, |
| "could not set timestamp (%d)\n", ret); |
| return ret; |
| } |
| |
| static int nvme_configure_apst(struct nvme_ctrl *ctrl) |
| { |
| /* |
| * APST (Autonomous Power State Transition) lets us program a |
| * table of power state transitions that the controller will |
| * perform automatically. We configure it with a simple |
| * heuristic: we are willing to spend at most 2% of the time |
| * transitioning between power states. Therefore, when running |
| * in any given state, we will enter the next lower-power |
| * non-operational state after waiting 50 * (enlat + exlat) |
| * microseconds, as long as that state's exit latency is under |
| * the requested maximum latency. |
| * |
| * We will not autonomously enter any non-operational state for |
| * which the total latency exceeds ps_max_latency_us. Users |
| * can set ps_max_latency_us to zero to turn off APST. |
| */ |
| |
| unsigned apste; |
| struct nvme_feat_auto_pst *table; |
| u64 max_lat_us = 0; |
| int max_ps = -1; |
| int ret; |
| |
| /* |
| * If APST isn't supported or if we haven't been initialized yet, |
| * then don't do anything. |
| */ |
| if (!ctrl->apsta) |
| return 0; |
| |
| if (ctrl->npss > 31) { |
| dev_warn(ctrl->device, "NPSS is invalid; not using APST\n"); |
| return 0; |
| } |
| |
| table = kzalloc(sizeof(*table), GFP_KERNEL); |
| if (!table) |
| return 0; |
| |
| if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) { |
| /* Turn off APST. */ |
| apste = 0; |
| dev_dbg(ctrl->device, "APST disabled\n"); |
| } else { |
| __le64 target = cpu_to_le64(0); |
| int state; |
| |
| /* |
| * Walk through all states from lowest- to highest-power. |
| * According to the spec, lower-numbered states use more |
| * power. NPSS, despite the name, is the index of the |
| * lowest-power state, not the number of states. |
| */ |
| for (state = (int)ctrl->npss; state >= 0; state--) { |
| u64 total_latency_us, exit_latency_us, transition_ms; |
| |
| if (target) |
| table->entries[state] = target; |
| |
| /* |
| * Don't allow transitions to the deepest state |
| * if it's quirked off. |
| */ |
| if (state == ctrl->npss && |
| (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) |
| continue; |
| |
| /* |
| * Is this state a useful non-operational state for |
| * higher-power states to autonomously transition to? |
| */ |
| if (!(ctrl->psd[state].flags & |
| NVME_PS_FLAGS_NON_OP_STATE)) |
| continue; |
| |
| exit_latency_us = |
| (u64)le32_to_cpu(ctrl->psd[state].exit_lat); |
| if (exit_latency_us > ctrl->ps_max_latency_us) |
| continue; |
| |
| total_latency_us = |
| exit_latency_us + |
| le32_to_cpu(ctrl->psd[state].entry_lat); |
| |
| /* |
| * This state is good. Use it as the APST idle |
| * target for higher power states. |
| */ |
| transition_ms = total_latency_us + 19; |
| do_div(transition_ms, 20); |
| if (transition_ms > (1 << 24) - 1) |
| transition_ms = (1 << 24) - 1; |
| |
| target = cpu_to_le64((state << 3) | |
| (transition_ms << 8)); |
| |
| if (max_ps == -1) |
| max_ps = state; |
| |
| if (total_latency_us > max_lat_us) |
| max_lat_us = total_latency_us; |
| } |
| |
| apste = 1; |
| |
| if (max_ps == -1) { |
| dev_dbg(ctrl->device, "APST enabled but no non-operational states are available\n"); |
| } else { |
| dev_dbg(ctrl->device, "APST enabled: max PS = %d, max round-trip latency = %lluus, table = %*phN\n", |
| max_ps, max_lat_us, (int)sizeof(*table), table); |
| } |
| } |
| |
| ret = nvme_set_features(ctrl, NVME_FEAT_AUTO_PST, apste, |
| table, sizeof(*table), NULL); |
| if (ret) |
| dev_err(ctrl->device, "failed to set APST feature (%d)\n", ret); |
| |
| kfree(table); |
| return ret; |
| } |
| |
| static void nvme_set_latency_tolerance(struct device *dev, s32 val) |
| { |
| struct nvme_ctrl *ctrl = dev_get_drvdata(dev); |
| u64 latency; |
| |
| switch (val) { |
| case PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT: |
| case PM_QOS_LATENCY_ANY: |
| latency = U64_MAX; |
| break; |
| |
| default: |
| latency = val; |
| } |
| |
| if (ctrl->ps_max_latency_us != latency) { |
| ctrl->ps_max_latency_us = latency; |
| nvme_configure_apst(ctrl); |
| } |
| } |
| |
| struct nvme_core_quirk_entry { |
| /* |
| * NVMe model and firmware strings are padded with spaces. For |
| * simplicity, strings in the quirk table are padded with NULLs |
| * instead. |
| */ |
| u16 vid; |
| const char *mn; |
| const char *fr; |
| unsigned long quirks; |
| }; |
| |
| static const struct nvme_core_quirk_entry core_quirks[] = { |
| { |
| /* |
| * This Toshiba device seems to die using any APST states. See: |
| * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1678184/comments/11 |
| */ |
| .vid = 0x1179, |
| .mn = "THNSF5256GPUK TOSHIBA", |
| .quirks = NVME_QUIRK_NO_APST, |
| } |
| }; |
| |
| /* match is null-terminated but idstr is space-padded. */ |
| static bool string_matches(const char *idstr, const char *match, size_t len) |
| { |
| size_t matchlen; |
| |
| if (!match) |
| return true; |
| |
| matchlen = strlen(match); |
| WARN_ON_ONCE(matchlen > len); |
| |
| if (memcmp(idstr, match, matchlen)) |
| return false; |
| |
| for (; matchlen < len; matchlen++) |
| if (idstr[matchlen] != ' ') |
| return false; |
| |
| return true; |
| } |
| |
| static bool quirk_matches(const struct nvme_id_ctrl *id, |
| const struct nvme_core_quirk_entry *q) |
| { |
| return q->vid == le16_to_cpu(id->vid) && |
| string_matches(id->mn, q->mn, sizeof(id->mn)) && |
| string_matches(id->fr, q->fr, sizeof(id->fr)); |
| } |
| |
| static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl, |
| struct nvme_id_ctrl *id) |
| { |
| size_t nqnlen; |
| int off; |
| |
| nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE); |
| if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) { |
| strncpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE); |
| return; |
| } |
| |
| if (ctrl->vs >= NVME_VS(1, 2, 1)) |
| dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n"); |
| |
| /* Generate a "fake" NQN per Figure 254 in NVMe 1.3 + ECN 001 */ |
| off = snprintf(subsys->subnqn, NVMF_NQN_SIZE, |
| "nqn.2014.08.org.nvmexpress:%04x%04x", |
| le16_to_cpu(id->vid), le16_to_cpu(id->ssvid)); |
| memcpy(subsys->subnqn + off, id->sn, sizeof(id->sn)); |
| off += sizeof(id->sn); |
| memcpy(subsys->subnqn + off, id->mn, sizeof(id->mn)); |
| off += sizeof(id->mn); |
| memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off); |
| } |
| |
| static void __nvme_release_subsystem(struct nvme_subsystem *subsys) |
| { |
| ida_simple_remove(&nvme_subsystems_ida, subsys->instance); |
| kfree(subsys); |
| } |
| |
| static void nvme_release_subsystem(struct device *dev) |
| { |
| __nvme_release_subsystem(container_of(dev, struct nvme_subsystem, dev)); |
| } |
| |
| static void nvme_destroy_subsystem(struct kref *ref) |
| { |
| struct nvme_subsystem *subsys = |
| container_of(ref, struct nvme_subsystem, ref); |
| |
| mutex_lock(&nvme_subsystems_lock); |
| list_del(&subsys->entry); |
| mutex_unlock(&nvme_subsystems_lock); |
| |
| ida_destroy(&subsys->ns_ida); |
| device_del(&subsys->dev); |
| put_device(&subsys->dev); |
| } |
| |
| static void nvme_put_subsystem(struct nvme_subsystem *subsys) |
| { |
| kref_put(&subsys->ref, nvme_destroy_subsystem); |
| } |
| |
| static struct nvme_subsystem *__nvme_find_get_subsystem(const char *subsysnqn) |
| { |
| struct nvme_subsystem *subsys; |
| |
| lockdep_assert_held(&nvme_subsystems_lock); |
| |
| list_for_each_entry(subsys, &nvme_subsystems, entry) { |
| if (strcmp(subsys->subnqn, subsysnqn)) |
| continue; |
| if (!kref_get_unless_zero(&subsys->ref)) |
| continue; |
| return subsys; |
| } |
| |
| return NULL; |
| } |
| |
| #define SUBSYS_ATTR_RO(_name, _mode, _show) \ |
| struct device_attribute subsys_attr_##_name = \ |
| __ATTR(_name, _mode, _show, NULL) |
| |
| static ssize_t nvme_subsys_show_nqn(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct nvme_subsystem *subsys = |
| container_of(dev, struct nvme_subsystem, dev); |
| |
| return snprintf(buf, PAGE_SIZE, "%s\n", subsys->subnqn); |
| } |
| static SUBSYS_ATTR_RO(subsysnqn, S_IRUGO, nvme_subsys_show_nqn); |
| |
| #define nvme_subsys_show_str_function(field) \ |
| static ssize_t subsys_##field##_show(struct device *dev, \ |
| struct device_attribute *attr, char *buf) \ |
| { \ |
| struct nvme_subsystem *subsys = \ |
| container_of(dev, struct nvme_subsystem, dev); \ |
| return sprintf(buf, "%.*s\n", \ |
| (int)sizeof(subsys->field), subsys->field); \ |
| } \ |
| static SUBSYS_ATTR_RO(field, S_IRUGO, subsys_##field##_show); |
| |
| nvme_subsys_show_str_function(model); |
| nvme_subsys_show_str_function(serial); |
| nvme_subsys_show_str_function(firmware_rev); |
| |
| static struct attribute *nvme_subsys_attrs[] = { |
| &subsys_attr_model.attr, |
| &subsys_attr_serial.attr, |
| &subsys_attr_firmware_rev.attr, |
| &subsys_attr_subsysnqn.attr, |
| NULL, |
| }; |
| |
| static struct attribute_group nvme_subsys_attrs_group = { |
| .attrs = nvme_subsys_attrs, |
| }; |
| |
| static const struct attribute_group *nvme_subsys_attrs_groups[] = { |
| &nvme_subsys_attrs_group, |
| NULL, |
| }; |
| |
| static int nvme_active_ctrls(struct nvme_subsystem *subsys) |
| { |
| int count = 0; |
| struct nvme_ctrl *ctrl; |
| |
| mutex_lock(&subsys->lock); |
| list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) { |
| if (ctrl->state != NVME_CTRL_DELETING && |
| ctrl->state != NVME_CTRL_DEAD) |
| count++; |
| } |
| mutex_unlock(&subsys->lock); |
| |
| return count; |
| } |
| |
| static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) |
| { |
| struct nvme_subsystem *subsys, *found; |
| int ret; |
| |
| subsys = kzalloc(sizeof(*subsys), GFP_KERNEL); |
| if (!subsys) |
| return -ENOMEM; |
| ret = ida_simple_get(&nvme_subsystems_ida, 0, 0, GFP_KERNEL); |
| if (ret < 0) { |
| kfree(subsys); |
| return ret; |
| } |
| subsys->instance = ret; |
| mutex_init(&subsys->lock); |
| kref_init(&subsys->ref); |
| INIT_LIST_HEAD(&subsys->ctrls); |
| INIT_LIST_HEAD(&subsys->nsheads); |
| nvme_init_subnqn(subsys, ctrl, id); |
| memcpy(subsys->serial, id->sn, sizeof(subsys->serial)); |
| memcpy(subsys->model, id->mn, sizeof(subsys->model)); |
| memcpy(subsys->firmware_rev, id->fr, sizeof(subsys->firmware_rev)); |
| subsys->vendor_id = le16_to_cpu(id->vid); |
| subsys->cmic = id->cmic; |
| |
| subsys->dev.class = nvme_subsys_class; |
| subsys->dev.release = nvme_release_subsystem; |
| subsys->dev.groups = nvme_subsys_attrs_groups; |
| dev_set_name(&subsys->dev, "nvme-subsys%d", subsys->instance); |
| device_initialize(&subsys->dev); |
| |
| mutex_lock(&nvme_subsystems_lock); |
| found = __nvme_find_get_subsystem(subsys->subnqn); |
| if (found) { |
| /* |
| * Verify that the subsystem actually supports multiple |
| * controllers, else bail out. |
| */ |
| if (!(ctrl->opts && ctrl->opts->discovery_nqn) && |
| nvme_active_ctrls(found) && !(id->cmic & (1 << 1))) { |
| dev_err(ctrl->device, |
| "ignoring ctrl due to duplicate subnqn (%s).\n", |
| found->subnqn); |
| nvme_put_subsystem(found); |
| ret = -EINVAL; |
| goto out_unlock; |
| } |
| |
| __nvme_release_subsystem(subsys); |
| subsys = found; |
| } else { |
| ret = device_add(&subsys->dev); |
| if (ret) { |
| dev_err(ctrl->device, |
| "failed to register subsystem device.\n"); |
| goto out_unlock; |
| } |
| ida_init(&subsys->ns_ida); |
| list_add_tail(&subsys->entry, &nvme_subsystems); |
| } |
| |
| ctrl->subsys = subsys; |
| mutex_unlock(&nvme_subsystems_lock); |
| |
| if (sysfs_create_link(&subsys->dev.kobj, &ctrl->device->kobj, |
| dev_name(ctrl->device))) { |
| dev_err(ctrl->device, |
| "failed to create sysfs link from subsystem.\n"); |
| /* the transport driver will eventually put the subsystem */ |
| return -EINVAL; |
| } |
| |
| mutex_lock(&subsys->lock); |
| list_add_tail(&ctrl->subsys_entry, &subsys->ctrls); |
| mutex_unlock(&subsys->lock); |
| |
| return 0; |
| |
| out_unlock: |
| mutex_unlock(&nvme_subsystems_lock); |
| put_device(&subsys->dev); |
| return ret; |
| } |
| |
| int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, |
| void *log, size_t size, u64 offset) |
| { |
| struct nvme_command c = { }; |
| unsigned long dwlen = size / 4 - 1; |
| |
| c.get_log_page.opcode = nvme_admin_get_log_page; |
| c.get_log_page.nsid = cpu_to_le32(nsid); |
| c.get_log_page.lid = log_page; |
| c.get_log_page.lsp = lsp; |
| c.get_log_page.numdl = cpu_to_le16(dwlen & ((1 << 16) - 1)); |
| c.get_log_page.numdu = cpu_to_le16(dwlen >> 16); |
| c.get_log_page.lpol = cpu_to_le32(lower_32_bits(offset)); |
| c.get_log_page.lpou = cpu_to_le32(upper_32_bits(offset)); |
| |
| return nvme_submit_sync_cmd(ctrl->admin_q, &c, log, size); |
| } |
| |
| static int nvme_get_effects_log(struct nvme_ctrl *ctrl) |
| { |
| int ret; |
| |
| if (!ctrl->effects) |
| ctrl->effects = kzalloc(sizeof(*ctrl->effects), GFP_KERNEL); |
| |
| if (!ctrl->effects) |
| return 0; |
| |
| ret = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CMD_EFFECTS, 0, |
| ctrl->effects, sizeof(*ctrl->effects), 0); |
| if (ret) { |
| kfree(ctrl->effects); |
| ctrl->effects = NULL; |
| } |
| return ret; |
| } |
| |
| /* |
| * Initialize the cached copies of the Identify data and various controller |
| * register in our nvme_ctrl structure. This should be called as soon as |
| * the admin queue is fully up and running. |
| */ |
| int nvme_init_identify(struct nvme_ctrl *ctrl) |
| { |
| struct nvme_id_ctrl *id; |
| u64 cap; |
| int ret, page_shift; |
| u32 max_hw_sectors; |
| bool prev_apst_enabled; |
| |
| ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs); |
| if (ret) { |
| dev_err(ctrl->device, "Reading VS failed (%d)\n", ret); |
| return ret; |
| } |
| |
| ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap); |
| if (ret) { |
| dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret); |
| return ret; |
| } |
| page_shift = NVME_CAP_MPSMIN(cap) + 12; |
| |
| if (ctrl->vs >= NVME_VS(1, 1, 0)) |
| ctrl->subsystem = NVME_CAP_NSSRC(cap); |
| |
| ret = nvme_identify_ctrl(ctrl, &id); |
| if (ret) { |
| dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret); |
| return -EIO; |
| } |
| |
| if (id->lpa & NVME_CTRL_LPA_CMD_EFFECTS_LOG) { |
| ret = nvme_get_effects_log(ctrl); |
| if (ret < 0) |
| goto out_free; |
| } |
| |
| if (!ctrl->identified) { |
| int i; |
| |
| ret = nvme_init_subsystem(ctrl, id); |
| if (ret) |
| goto out_free; |
| |
| /* |
| * Check for quirks. Quirk can depend on firmware version, |
| * so, in principle, the set of quirks present can change |
| * across a reset. As a possible future enhancement, we |
| * could re-scan for quirks every time we reinitialize |
| * the device, but we'd have to make sure that the driver |
| * behaves intelligently if the quirks change. |
| */ |
| for (i = 0; i < ARRAY_SIZE(core_quirks); i++) { |
| if (quirk_matches(id, &core_quirks[i])) |
| ctrl->quirks |= core_quirks[i].quirks; |
| } |
| } |
| |
| if (force_apst && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) { |
| dev_warn(ctrl->device, "forcibly allowing all power states due to nvme_core.force_apst -- use at your own risk\n"); |
| ctrl->quirks &= ~NVME_QUIRK_NO_DEEPEST_PS; |
| } |
| |
| ctrl->oacs = le16_to_cpu(id->oacs); |
| ctrl->oncs = le16_to_cpup(&id->oncs); |
| ctrl->oaes = le32_to_cpu(id->oaes); |
| atomic_set(&ctrl->abort_limit, id->acl + 1); |
| ctrl->vwc = id->vwc; |
| ctrl->cntlid = le16_to_cpup(&id->cntlid); |
| if (id->mdts) |
| max_hw_sectors = 1 << (id->mdts + page_shift - 9); |
| else |
| max_hw_sectors = UINT_MAX; |
| ctrl->max_hw_sectors = |
| min_not_zero(ctrl->max_hw_sectors, max_hw_sectors); |
| |
| nvme_set_queue_limits(ctrl, ctrl->admin_q); |
| ctrl->sgls = le32_to_cpu(id->sgls); |
| ctrl->kas = le16_to_cpu(id->kas); |
| ctrl->max_namespaces = le32_to_cpu(id->mnan); |
| |
| if (id->rtd3e) { |
| /* us -> s */ |
| u32 transition_time = le32_to_cpu(id->rtd3e) / 1000000; |
| |
| ctrl->shutdown_timeout = clamp_t(unsigned int, transition_time, |
| shutdown_timeout, 60); |
| |
| if (ctrl->shutdown_timeout != shutdown_timeout) |
| dev_info(ctrl->device, |
| "Shutdown timeout set to %u seconds\n", |
| ctrl->shutdown_timeout); |
| } else |
| ctrl->shutdown_timeout = shutdown_timeout; |
| |
| ctrl->npss = id->npss; |
| ctrl->apsta = id->apsta; |
| prev_apst_enabled = ctrl->apst_enabled; |
| if (ctrl->quirks & NVME_QUIRK_NO_APST) { |
| if (force_apst && id->apsta) { |
| dev_warn(ctrl->device, "forcibly allowing APST due to nvme_core.force_apst -- use at your own risk\n"); |
| ctrl->apst_enabled = true; |
| } else { |
| ctrl->apst_enabled = false; |
| } |
| } else { |
| ctrl->apst_enabled = id->apsta; |
| } |
| memcpy(ctrl->psd, id->psd, sizeof(ctrl->psd)); |
| |
| if (ctrl->ops->flags & NVME_F_FABRICS) { |
| ctrl->icdoff = le16_to_cpu(id->icdoff); |
| ctrl->ioccsz = le32_to_cpu(id->ioccsz); |
| ctrl->iorcsz = le32_to_cpu(id->iorcsz); |
| ctrl->maxcmd = le16_to_cpu(id->maxcmd); |
| |
| /* |
| * In fabrics we need to verify the cntlid matches the |
| * admin connect |
| */ |
| if (ctrl->cntlid != le16_to_cpu(id->cntlid)) { |
| ret = -EINVAL; |
| goto out_free; |
| } |
| |
| if (!ctrl->opts->discovery_nqn && !ctrl->kas) { |
| dev_err(ctrl->device, |
| "keep-alive support is mandatory for fabrics\n"); |
| ret = -EINVAL; |
| goto out_free; |
| } |
| } else { |
| ctrl->cntlid = le16_to_cpu(id->cntlid); |
| ctrl->hmpre = le32_to_cpu(id->hmpre); |
| ctrl->hmmin = le32_to_cpu(id->hmmin); |
| ctrl->hmminds = le32_to_cpu(id->hmminds); |
| ctrl->hmmaxd = le16_to_cpu(id->hmmaxd); |
| } |
| |
| ret = nvme_mpath_init(ctrl, id); |
| kfree(id); |
| |
| if (ret < 0) |
| return ret; |
| |
| if (ctrl->apst_enabled && !prev_apst_enabled) |
| dev_pm_qos_expose_latency_tolerance(ctrl->device); |
| else if (!ctrl->apst_enabled && prev_apst_enabled) |
| dev_pm_qos_hide_latency_tolerance(ctrl->device); |
| |
| ret = nvme_configure_apst(ctrl); |
| if (ret < 0) |
| return ret; |
| |
| ret = nvme_configure_timestamp(ctrl); |
| if (ret < 0) |
| return ret; |
| |
| ret = nvme_configure_directives(ctrl); |
| if (ret < 0) |
| return ret; |
| |
| ctrl->identified = true; |
| |
| return 0; |
| |
| out_free: |
| kfree(id); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(nvme_init_identify); |
| |
| static int nvme_dev_open(struct inode *inode, struct file *file) |
| { |
| struct nvme_ctrl *ctrl = |
| container_of(inode->i_cdev, struct nvme_ctrl, cdev); |
| |
| switch (ctrl->state) { |
| case NVME_CTRL_LIVE: |
| case NVME_CTRL_ADMIN_ONLY: |
| break; |
| default: |
| return -EWOULDBLOCK; |
| } |
| |
| file->private_data = ctrl; |
| return 0; |
| } |
| |
| static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp) |
| { |
| struct nvme_ns *ns; |
| int ret; |
| |
| down_read(&ctrl->namespaces_rwsem); |
| if (list_empty(&ctrl->namespaces)) { |
| ret = -ENOTTY; |
| goto out_unlock; |
| } |
| |
| ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list); |
| if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) { |
| dev_warn(ctrl->device, |
| "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n"); |
| ret = -EINVAL; |
| goto out_unlock; |
| } |
| |
| dev_warn(ctrl->device, |
| "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n"); |
| kref_get(&ns->kref); |
| up_read(&ctrl->namespaces_rwsem); |
| |
| ret = nvme_user_cmd(ctrl, ns, argp); |
| nvme_put_ns(ns); |
| return ret; |
| |
| out_unlock: |
| up_read(&ctrl->namespaces_rwsem); |
| return ret; |
| } |
| |
| static long nvme_dev_ioctl(struct file *file, unsigned int cmd, |
| unsigned long arg) |
| { |
| struct nvme_ctrl *ctrl = file->private_data; |
| void __user *argp = (void __user *)arg; |
| |
| switch (cmd) { |
| case NVME_IOCTL_ADMIN_CMD: |
| return nvme_user_cmd(ctrl, NULL, argp); |
| case NVME_IOCTL_IO_CMD: |
| return nvme_dev_user_cmd(ctrl, argp); |
| case NVME_IOCTL_RESET: |
| dev_warn(ctrl->device, "resetting controller\n"); |
| return nvme_reset_ctrl_sync(ctrl); |
| case NVME_IOCTL_SUBSYS_RESET: |
| return nvme_reset_subsystem(ctrl); |
| case NVME_IOCTL_RESCAN: |
| nvme_queue_scan(ctrl); |
| return 0; |
| default: |
| return -ENOTTY; |
| } |
| } |
| |
| static const struct file_operations nvme_dev_fops = { |
| .owner = THIS_MODULE, |
| .open = nvme_dev_open, |
| .unlocked_ioctl = nvme_dev_ioctl, |
| .compat_ioctl = nvme_dev_ioctl, |
| }; |
| |
| static ssize_t nvme_sysfs_reset(struct device *dev, |
| struct device_attribute *attr, const char *buf, |
| size_t count) |
| { |
| struct nvme_ctrl *ctrl = dev_get_drvdata(dev); |
| int ret; |
| |
| ret = nvme_reset_ctrl_sync(ctrl); |
| if (ret < 0) |
| return ret; |
| return count; |
| } |
| static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset); |
| |
| static ssize_t nvme_sysfs_rescan(struct device *dev, |
| struct device_attribute *attr, const char *buf, |
| size_t count) |
| { |
| struct nvme_ctrl *ctrl = dev_get_drvdata(dev); |
| |
| nvme_queue_scan(ctrl); |
| return count; |
| } |
| static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan); |
| |
| static inline struct nvme_ns_head *dev_to_ns_head(struct device *dev) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| if (disk->fops == &nvme_fops) |
| return nvme_get_ns_from_dev(dev)->head; |
| else |
| return disk->private_data; |
| } |
| |
| static ssize_t wwid_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct nvme_ns_head *head = dev_to_ns_head(dev); |
| struct nvme_ns_ids *ids = &head->ids; |
| struct nvme_subsystem *subsys = head->subsys; |
| int serial_len = sizeof(subsys->serial); |
| int model_len = sizeof(subsys->model); |
| |
| if (!uuid_is_null(&ids->uuid)) |
| return sprintf(buf, "uuid.%pU\n", &ids->uuid); |
| |
| if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) |
| return sprintf(buf, "eui.%16phN\n", ids->nguid); |
| |
| if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64))) |
| return sprintf(buf, "eui.%8phN\n", ids->eui64); |
| |
| while (serial_len > 0 && (subsys->serial[serial_len - 1] == ' ' || |
| subsys->serial[serial_len - 1] == '\0')) |
| serial_len--; |
| while (model_len > 0 && (subsys->model[model_len - 1] == ' ' || |
| subsys->model[model_len - 1] == '\0')) |
| model_len--; |
| |
| return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", subsys->vendor_id, |
| serial_len, subsys->serial, model_len, subsys->model, |
| head->ns_id); |
| } |
| static DEVICE_ATTR_RO(wwid); |
| |
| static ssize_t nguid_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| return sprintf(buf, "%pU\n", dev_to_ns_head(dev)->ids.nguid); |
| } |
| static DEVICE_ATTR_RO(nguid); |
| |
| static ssize_t uuid_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids; |
| |
| /* For backward compatibility expose the NGUID to userspace if |
| * we have no UUID set |
| */ |
| if (uuid_is_null(&ids->uuid)) { |
| printk_ratelimited(KERN_WARNING |
| "No UUID available providing old NGUID\n"); |
| return sprintf(buf, "%pU\n", ids->nguid); |
| } |
| return sprintf(buf, "%pU\n", &ids->uuid); |
| } |
| static DEVICE_ATTR_RO(uuid); |
| |
| static ssize_t eui_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| return sprintf(buf, "%8ph\n", dev_to_ns_head(dev)->ids.eui64); |
| } |
| static DEVICE_ATTR_RO(eui); |
| |
| static ssize_t nsid_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| return sprintf(buf, "%d\n", dev_to_ns_head(dev)->ns_id); |
| } |
| static DEVICE_ATTR_RO(nsid); |
| |
| static struct attribute *nvme_ns_id_attrs[] = { |
| &dev_attr_wwid.attr, |
| &dev_attr_uuid.attr, |
| &dev_attr_nguid.attr, |
| &dev_attr_eui.attr, |
| &dev_attr_nsid.attr, |
| #ifdef CONFIG_NVME_MULTIPATH |
| &dev_attr_ana_grpid.attr, |
| &dev_attr_ana_state.attr, |
| #endif |
| NULL, |
| }; |
| |
| static umode_t nvme_ns_id_attrs_are_visible(struct kobject *kobj, |
| struct attribute *a, int n) |
| { |
| struct device *dev = container_of(kobj, struct device, kobj); |
| struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids; |
| |
| if (a == &dev_attr_uuid.attr) { |
| if (uuid_is_null(&ids->uuid) && |
| !memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) |
| return 0; |
| } |
| if (a == &dev_attr_nguid.attr) { |
| if (!memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) |
| return 0; |
| } |
| if (a == &dev_attr_eui.attr) { |
| if (!memchr_inv(ids->eui64, 0, sizeof(ids->eui64))) |
| return 0; |
| } |
| #ifdef CONFIG_NVME_MULTIPATH |
| if (a == &dev_attr_ana_grpid.attr || a == &dev_attr_ana_state.attr) { |
| if (dev_to_disk(dev)->fops != &nvme_fops) /* per-path attr */ |
| return 0; |
| if (!nvme_ctrl_use_ana(nvme_get_ns_from_dev(dev)->ctrl)) |
| return 0; |
| } |
| #endif |
| return a->mode; |
| } |
| |
| const struct attribute_group nvme_ns_id_attr_group = { |
| .attrs = nvme_ns_id_attrs, |
| .is_visible = nvme_ns_id_attrs_are_visible, |
| }; |
| |
| #define nvme_show_str_function(field) \ |
| static ssize_t field##_show(struct device *dev, \ |
| struct device_attribute *attr, char *buf) \ |
| { \ |
| struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \ |
| return sprintf(buf, "%.*s\n", \ |
| (int)sizeof(ctrl->subsys->field), ctrl->subsys->field); \ |
| } \ |
| static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL); |
| |
| nvme_show_str_function(model); |
| nvme_show_str_function(serial); |
| nvme_show_str_function(firmware_rev); |
| |
| #define nvme_show_int_function(field) \ |
| static ssize_t field##_show(struct device *dev, \ |
| struct device_attribute *attr, char *buf) \ |
| { \ |
| struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \ |
| return sprintf(buf, "%d\n", ctrl->field); \ |
| } \ |
| static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL); |
| |
| nvme_show_int_function(cntlid); |
| |
| static ssize_t nvme_sysfs_delete(struct device *dev, |
| struct device_attribute *attr, const char *buf, |
| size_t count) |
| { |
| struct nvme_ctrl *ctrl = dev_get_drvdata(dev); |
| |
| if (device_remove_file_self(dev, attr)) |
| nvme_delete_ctrl_sync(ctrl); |
| return count; |
| } |
| static DEVICE_ATTR(delete_controller, S_IWUSR, NULL, nvme_sysfs_delete); |
| |
| static ssize_t nvme_sysfs_show_transport(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct nvme_ctrl *ctrl = dev_get_drvdata(dev); |
| |
| return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->ops->name); |
| } |
| static DEVICE_ATTR(transport, S_IRUGO, nvme_sysfs_show_transport, NULL); |
| |
| static ssize_t nvme_sysfs_show_state(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct nvme_ctrl *ctrl = dev_get_drvdata(dev); |
| static const char *const state_name[] = { |
| [NVME_CTRL_NEW] = "new", |
| [NVME_CTRL_LIVE] = "live", |
| [NVME_CTRL_ADMIN_ONLY] = "only-admin", |
| [NVME_CTRL_RESETTING] = "resetting", |
| [NVME_CTRL_CONNECTING] = "connecting", |
| [NVME_CTRL_DELETING] = "deleting", |
| [NVME_CTRL_DEAD] = "dead", |
| }; |
| |
| if ((unsigned)ctrl->state < ARRAY_SIZE(state_name) && |
| state_name[ctrl->state]) |
| return sprintf(buf, "%s\n", state_name[ctrl->state]); |
| |
| return sprintf(buf, "unknown state\n"); |
| } |
| |
| static DEVICE_ATTR(state, S_IRUGO, nvme_sysfs_show_state, NULL); |
| |
| static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct nvme_ctrl *ctrl = dev_get_drvdata(dev); |
| |
| return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subsys->subnqn); |
| } |
| static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL); |
| |
| static ssize_t nvme_sysfs_show_address(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct nvme_ctrl *ctrl = dev_get_drvdata(dev); |
| |
| return ctrl->ops->get_address(ctrl, buf, PAGE_SIZE); |
| } |
| static DEVICE_ATTR(address, S_IRUGO, nvme_sysfs_show_address, NULL); |
| |
| static struct attribute *nvme_dev_attrs[] = { |
| &dev_attr_reset_controller.attr, |
| &dev_attr_rescan_controller.attr, |
| &dev_attr_model.attr, |
| &dev_attr_serial.attr, |
| &dev_attr_firmware_rev.attr, |
| &dev_attr_cntlid.attr, |
| &dev_attr_delete_controller.attr, |
| &dev_attr_transport.attr, |
| &dev_attr_subsysnqn.attr, |
| &dev_attr_address.attr, |
| &dev_attr_state.attr, |
| NULL |
| }; |
| |
| static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj, |
| struct attribute *a, int n) |
| { |
| struct device *dev = container_of(kobj, struct device, kobj); |
| struct nvme_ctrl *ctrl = dev_get_drvdata(dev); |
| |
| if (a == &dev_attr_delete_controller.attr && !ctrl->ops->delete_ctrl) |
| return 0; |
| if (a == &dev_attr_address.attr && !ctrl->ops->get_address) |
| return 0; |
| |
| return a->mode; |
| } |
| |
| static struct attribute_group nvme_dev_attrs_group = { |
| .attrs = nvme_dev_attrs, |
| .is_visible = nvme_dev_attrs_are_visible, |
| }; |
| |
| static const struct attribute_group *nvme_dev_attr_groups[] = { |
| &nvme_dev_attrs_group, |
| NULL, |
| }; |
| |
| static struct nvme_ns_head *__nvme_find_ns_head(struct nvme_subsystem *subsys, |
| unsigned nsid) |
| { |
| struct nvme_ns_head *h; |
| |
| lockdep_assert_held(&subsys->lock); |
| |
| list_for_each_entry(h, &subsys->nsheads, entry) { |
| if (h->ns_id == nsid && kref_get_unless_zero(&h->ref)) |
| return h; |
| } |
| |
| return NULL; |
| } |
| |
| static int __nvme_check_ids(struct nvme_subsystem *subsys, |
| struct nvme_ns_head *new) |
| { |
| struct nvme_ns_head *h; |
| |
| lockdep_assert_held(&subsys->lock); |
| |
| list_for_each_entry(h, &subsys->nsheads, entry) { |
| if (nvme_ns_ids_valid(&new->ids) && |
| !list_empty(&h->list) && |
| nvme_ns_ids_equal(&new->ids, &h->ids)) |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl, |
| unsigned nsid, struct nvme_id_ns *id) |
| { |
| struct nvme_ns_head *head; |
| int ret = -ENOMEM; |
| |
| head = kzalloc(sizeof(*head), GFP_KERNEL); |
| if (!head) |
| goto out; |
| ret = ida_simple_get(&ctrl->subsys->ns_ida, 1, 0, GFP_KERNEL); |
| if (ret < 0) |
| goto out_free_head; |
| head->instance = ret; |
| INIT_LIST_HEAD(&head->list); |
| ret = init_srcu_struct(&head->srcu); |
| if (ret) |
| goto out_ida_remove; |
| head->subsys = ctrl->subsys; |
| head->ns_id = nsid; |
| kref_init(&head->ref); |
| |
| nvme_report_ns_ids(ctrl, nsid, id, &head->ids); |
| |
| ret = __nvme_check_ids(ctrl->subsys, head); |
| if (ret) { |
| dev_err(ctrl->device, |
| "duplicate IDs for nsid %d\n", nsid); |
| goto out_cleanup_srcu; |
| } |
| |
| ret = nvme_mpath_alloc_disk(ctrl, head); |
| if (ret) |
| goto out_cleanup_srcu; |
| |
| list_add_tail(&head->entry, &ctrl->subsys->nsheads); |
| |
| kref_get(&ctrl->subsys->ref); |
| |
| return head; |
| out_cleanup_srcu: |
| cleanup_srcu_struct(&head->srcu); |
| out_ida_remove: |
| ida_simple_remove(&ctrl->subsys->ns_ida, head->instance); |
| out_free_head: |
| kfree(head); |
| out: |
| return ERR_PTR(ret); |
| } |
| |
| static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid, |
| struct nvme_id_ns *id) |
| { |
| struct nvme_ctrl *ctrl = ns->ctrl; |
| bool is_shared = id->nmic & (1 << 0); |
| struct nvme_ns_head *head = NULL; |
| int ret = 0; |
| |
| mutex_lock(&ctrl->subsys->lock); |
| if (is_shared) |
| head = __nvme_find_ns_head(ctrl->subsys, nsid); |
| if (!head) { |
| head = nvme_alloc_ns_head(ctrl, nsid, id); |
| if (IS_ERR(head)) { |
| ret = PTR_ERR(head); |
| goto out_unlock; |
| } |
| } else { |
| struct nvme_ns_ids ids; |
| |
| nvme_report_ns_ids(ctrl, nsid, id, &ids); |
| if (!nvme_ns_ids_equal(&head->ids, &ids)) { |
| dev_err(ctrl->device, |
| "IDs don't match for shared namespace %d\n", |
| nsid); |
| ret = -EINVAL; |
| goto out_unlock; |
| } |
| } |
| |
| list_add_tail(&ns->siblings, &head->list); |
| ns->head = head; |
| |
| out_unlock: |
| mutex_unlock(&ctrl->subsys->lock); |
| return ret; |
| } |
| |
| static int ns_cmp(void *priv, struct list_head *a, struct list_head *b) |
| { |
| struct nvme_ns *nsa = container_of(a, struct nvme_ns, list); |
| struct nvme_ns *nsb = container_of(b, struct nvme_ns, list); |
| |
| return nsa->head->ns_id - nsb->head->ns_id; |
| } |
| |
| static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid) |
| { |
| struct nvme_ns *ns, *ret = NULL; |
| |
| down_read(&ctrl->namespaces_rwsem); |
| list_for_each_entry(ns, &ctrl->namespaces, list) { |
| if (ns->head->ns_id == nsid) { |
| if (!kref_get_unless_zero(&ns->kref)) |
| continue; |
| ret = ns; |
| break; |
| } |
| if (ns->head->ns_id > nsid) |
| break; |
| } |
| up_read(&ctrl->namespaces_rwsem); |
| return ret; |
| } |
| |
| static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns) |
| { |
| struct streams_directive_params s; |
| int ret; |
| |
| if (!ctrl->nr_streams) |
| return 0; |
| |
| ret = nvme_get_stream_params(ctrl, &s, ns->head->ns_id); |
| if (ret) |
| return ret; |
| |
| ns->sws = le32_to_cpu(s.sws); |
| ns->sgs = le16_to_cpu(s.sgs); |
| |
| if (ns->sws) { |
| unsigned int bs = 1 << ns->lba_shift; |
| |
| blk_queue_io_min(ns->queue, bs * ns->sws); |
| if (ns->sgs) |
| blk_queue_io_opt(ns->queue, bs * ns->sws * ns->sgs); |
| } |
| |
| return 0; |
| } |
| |
| static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) |
| { |
| struct nvme_ns *ns; |
| struct gendisk *disk; |
| struct nvme_id_ns *id; |
| char disk_name[DISK_NAME_LEN]; |
| int node = dev_to_node(ctrl->dev), flags = GENHD_FL_EXT_DEVT; |
| |
| ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node); |
| if (!ns) |
| return; |
| |
| ns->queue = blk_mq_init_queue(ctrl->tagset); |
| if (IS_ERR(ns->queue)) |
| goto out_free_ns; |
| blk_queue_flag_set(QUEUE_FLAG_NONROT, ns->queue); |
| ns->queue->queuedata = ns; |
| ns->ctrl = ctrl; |
| |
| kref_init(&ns->kref); |
| ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */ |
| |
| blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift); |
| nvme_set_queue_limits(ctrl, ns->queue); |
| |
| id = nvme_identify_ns(ctrl, nsid); |
| if (!id) |
| goto out_free_queue; |
| |
| if (id->ncap == 0) |
| goto out_free_id; |
| |
| if (nvme_init_ns_head(ns, nsid, id)) |
| goto out_free_id; |
| nvme_setup_streams_ns(ctrl, ns); |
| nvme_set_disk_name(disk_name, ns, ctrl, &flags); |
| |
| if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) { |
| if (nvme_nvm_register(ns, disk_name, node)) { |
| dev_warn(ctrl->device, "LightNVM init failure\n"); |
| goto out_unlink_ns; |
| } |
| } |
| |
| disk = alloc_disk_node(0, node); |
| if (!disk) |
| goto out_unlink_ns; |
| |
| disk->fops = &nvme_fops; |
| disk->private_data = ns; |
| disk->queue = ns->queue; |
| disk->flags = flags; |
| memcpy(disk->disk_name, disk_name, DISK_NAME_LEN); |
| ns->disk = disk; |
| |
| __nvme_revalidate_disk(disk, id); |
| |
| down_write(&ctrl->namespaces_rwsem); |
| list_add_tail(&ns->list, &ctrl->namespaces); |
| up_write(&ctrl->namespaces_rwsem); |
| |
| nvme_get_ctrl(ctrl); |
| |
| device_add_disk(ctrl->device, ns->disk); |
| if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj, |
| &nvme_ns_id_attr_group)) |
| pr_warn("%s: failed to create sysfs group for identification\n", |
| ns->disk->disk_name); |
| if (ns->ndev && nvme_nvm_register_sysfs(ns)) |
| pr_warn("%s: failed to register lightnvm sysfs group for identification\n", |
| ns->disk->disk_name); |
| |
| nvme_mpath_add_disk(ns, id); |
| nvme_fault_inject_init(ns); |
| kfree(id); |
| |
| return; |
| out_unlink_ns: |
| mutex_lock(&ctrl->subsys->lock); |
| list_del_rcu(&ns->siblings); |
| mutex_unlock(&ctrl->subsys->lock); |
| out_free_id: |
| kfree(id); |
| out_free_queue: |
| blk_cleanup_queue(ns->queue); |
| out_free_ns: |
| kfree(ns); |
| } |
| |
| static void nvme_ns_remove(struct nvme_ns *ns) |
| { |
| if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags)) |
| return; |
| |
| nvme_fault_inject_fini(ns); |
| |
| mutex_lock(&ns->ctrl->subsys->lock); |
| list_del_rcu(&ns->siblings); |
| mutex_unlock(&ns->ctrl->subsys->lock); |
| synchronize_rcu(); /* guarantee not available in head->list */ |
| nvme_mpath_clear_current_path(ns); |
| synchronize_srcu(&ns->head->srcu); /* wait for concurrent submissions */ |
| |
| if (ns->disk && ns->disk->flags & GENHD_FL_UP) { |
| sysfs_remove_group(&disk_to_dev(ns->disk)->kobj, |
| &nvme_ns_id_attr_group); |
| if (ns->ndev) |
| nvme_nvm_unregister_sysfs(ns); |
| del_gendisk(ns->disk); |
| blk_cleanup_queue(ns->queue); |
| if (blk_get_integrity(ns->disk)) |
| blk_integrity_unregister(ns->disk); |
| } |
| |
| down_write(&ns->ctrl->namespaces_rwsem); |
| list_del_init(&ns->list); |
| up_write(&ns->ctrl->namespaces_rwsem); |
| |
| nvme_mpath_check_last_path(ns); |
| nvme_put_ns(ns); |
| } |
| |
| static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid) |
| { |
| struct nvme_ns *ns; |
| |
| ns = nvme_find_get_ns(ctrl, nsid); |
| if (ns) { |
| if (ns->disk && revalidate_disk(ns->disk)) |
| nvme_ns_remove(ns); |
| nvme_put_ns(ns); |
| } else |
| nvme_alloc_ns(ctrl, nsid); |
| } |
| |
| static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl, |
| unsigned nsid) |
| { |
| struct nvme_ns *ns, *next; |
| LIST_HEAD(rm_list); |
| |
| down_write(&ctrl->namespaces_rwsem); |
| list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) { |
| if (ns->head->ns_id > nsid || test_bit(NVME_NS_DEAD, &ns->flags)) |
| list_move_tail(&ns->list, &rm_list); |
| } |
| up_write(&ctrl->namespaces_rwsem); |
| |
| list_for_each_entry_safe(ns, next, &rm_list, list) |
| nvme_ns_remove(ns); |
| |
| } |
| |
| static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn) |
| { |
| struct nvme_ns *ns; |
| __le32 *ns_list; |
| unsigned i, j, nsid, prev = 0; |
| unsigned num_lists = DIV_ROUND_UP_ULL((u64)nn, 1024); |
| int ret = 0; |
| |
| ns_list = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL); |
| if (!ns_list) |
| return -ENOMEM; |
| |
| for (i = 0; i < num_lists; i++) { |
| ret = nvme_identify_ns_list(ctrl, prev, ns_list); |
| if (ret) |
| goto free; |
| |
| for (j = 0; j < min(nn, 1024U); j++) { |
| nsid = le32_to_cpu(ns_list[j]); |
| if (!nsid) |
| goto out; |
| |
| nvme_validate_ns(ctrl, nsid); |
| |
| while (++prev < nsid) { |
| ns = nvme_find_get_ns(ctrl, prev); |
| if (ns) { |
| nvme_ns_remove(ns); |
| nvme_put_ns(ns); |
| } |
| } |
| } |
| nn -= j; |
| } |
| out: |
| nvme_remove_invalid_namespaces(ctrl, prev); |
| free: |
| kfree(ns_list); |
| return ret; |
| } |
| |
| static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn) |
| { |
| unsigned i; |
| |
| for (i = 1; i <= nn; i++) |
| nvme_validate_ns(ctrl, i); |
| |
| nvme_remove_invalid_namespaces(ctrl, nn); |
| } |
| |
| static void nvme_clear_changed_ns_log(struct nvme_ctrl *ctrl) |
| { |
| size_t log_size = NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32); |
| __le32 *log; |
| int error; |
| |
| log = kzalloc(log_size, GFP_KERNEL); |
| if (!log) |
| return; |
| |
| /* |
| * We need to read the log to clear the AEN, but we don't want to rely |
| * on it for the changed namespace information as userspace could have |
| * raced with us in reading the log page, which could cause us to miss |
| * updates. |
| */ |
| error = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CHANGED_NS, 0, log, |
| log_size, 0); |
| if (error) |
| dev_warn(ctrl->device, |
| "reading changed ns log failed: %d\n", error); |
| |
| kfree(log); |
| } |
| |
| static void nvme_scan_work(struct work_struct *work) |
| { |
| struct nvme_ctrl *ctrl = |
| container_of(work, struct nvme_ctrl, scan_work); |
| struct nvme_id_ctrl *id; |
| unsigned nn; |
| |
| if (ctrl->state != NVME_CTRL_LIVE) |
| return; |
| |
| WARN_ON_ONCE(!ctrl->tagset); |
| |
| if (test_and_clear_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events)) { |
| dev_info(ctrl->device, "rescanning namespaces.\n"); |
| nvme_clear_changed_ns_log(ctrl); |
| } |
| |
| if (nvme_identify_ctrl(ctrl, &id)) |
| return; |
| |
| mutex_lock(&ctrl->scan_lock); |
| nn = le32_to_cpu(id->nn); |
| if (ctrl->vs >= NVME_VS(1, 1, 0) && |
| !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) { |
| if (!nvme_scan_ns_list(ctrl, nn)) |
| goto out_free_id; |
| } |
| nvme_scan_ns_sequential(ctrl, nn); |
| out_free_id: |
| mutex_unlock(&ctrl->scan_lock); |
| kfree(id); |
| down_write(&ctrl->namespaces_rwsem); |
| list_sort(NULL, &ctrl->namespaces, ns_cmp); |
| up_write(&ctrl->namespaces_rwsem); |
| } |
| |
| /* |
| * This function iterates the namespace list unlocked to allow recovery from |
| * controller failure. It is up to the caller to ensure the namespace list is |
| * not modified by scan work while this function is executing. |
| */ |
| void nvme_remove_namespaces(struct nvme_ctrl *ctrl) |
| { |
| struct nvme_ns *ns, *next; |
| LIST_HEAD(ns_list); |
| |
| /* prevent racing with ns scanning */ |
| flush_work(&ctrl->scan_work); |
| |
| /* |
| * The dead states indicates the controller was not gracefully |
| * disconnected. In that case, we won't be able to flush any data while |
| * removing the namespaces' disks; fail all the queues now to avoid |
| * potentially having to clean up the failed sync later. |
| */ |
| if (ctrl->state == NVME_CTRL_DEAD) |
| nvme_kill_queues(ctrl); |
| |
| down_write(&ctrl->namespaces_rwsem); |
| list_splice_init(&ctrl->namespaces, &ns_list); |
| up_write(&ctrl->namespaces_rwsem); |
| |
| list_for_each_entry_safe(ns, next, &ns_list, list) |
| nvme_ns_remove(ns); |
| } |
| EXPORT_SYMBOL_GPL(nvme_remove_namespaces); |
| |
| static void nvme_aen_uevent(struct nvme_ctrl *ctrl) |
| { |
| char *envp[2] = { NULL, NULL }; |
| u32 aen_result = ctrl->aen_result; |
| |
| ctrl->aen_result = 0; |
| if (!aen_result) |
| return; |
| |
| envp[0] = kasprintf(GFP_KERNEL, "NVME_AEN=%#08x", aen_result); |
| if (!envp[0]) |
| return; |
| kobject_uevent_env(&ctrl->device->kobj, KOBJ_CHANGE, envp); |
| kfree(envp[0]); |
| } |
| |
| static void nvme_async_event_work(struct work_struct *work) |
| { |
| struct nvme_ctrl *ctrl = |
| container_of(work, struct nvme_ctrl, async_event_work); |
| |
| nvme_aen_uevent(ctrl); |
| ctrl->ops->submit_async_event(ctrl); |
| } |
| |
| static bool nvme_ctrl_pp_status(struct nvme_ctrl *ctrl) |
| { |
| |
| u32 csts; |
| |
| if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) |
| return false; |
| |
| if (csts == ~0) |
| return false; |
| |
| return ((ctrl->ctrl_config & NVME_CC_ENABLE) && (csts & NVME_CSTS_PP)); |
| } |
| |
| static void nvme_get_fw_slot_info(struct nvme_ctrl *ctrl) |
| { |
| struct nvme_fw_slot_info_log *log; |
| |
| log = kmalloc(sizeof(*log), GFP_KERNEL); |
| if (!log) |
| return; |
| |
| if (nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_FW_SLOT, 0, log, |
| sizeof(*log), 0)) |
| dev_warn(ctrl->device, "Get FW SLOT INFO log error\n"); |
| kfree(log); |
| } |
| |
| static void nvme_fw_act_work(struct work_struct *work) |
| { |
| struct nvme_ctrl *ctrl = container_of(work, |
| struct nvme_ctrl, fw_act_work); |
| unsigned long fw_act_timeout; |
| |
| if (ctrl->mtfa) |
| fw_act_timeout = jiffies + |
| msecs_to_jiffies(ctrl->mtfa * 100); |
| else |
| fw_act_timeout = jiffies + |
| msecs_to_jiffies(admin_timeout * 1000); |
| |
| nvme_stop_queues(ctrl); |
| while (nvme_ctrl_pp_status(ctrl)) { |
| if (time_after(jiffies, fw_act_timeout)) { |
| dev_warn(ctrl->device, |
| "Fw activation timeout, reset controller\n"); |
| nvme_reset_ctrl(ctrl); |
| break; |
| } |
| msleep(100); |
| } |
| |
| if (ctrl->state != NVME_CTRL_LIVE) |
| return; |
| |
| nvme_start_queues(ctrl); |
| /* read FW slot information to clear the AER */ |
| nvme_get_fw_slot_info(ctrl); |
| } |
| |
| static void nvme_handle_aen_notice(struct nvme_ctrl *ctrl, u32 result) |
| { |
| switch ((result & 0xff00) >> 8) { |
| 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: |
| 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 |
| 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); |
| |
| if (le16_to_cpu(status) >> 1 != NVME_SC_SUCCESS) |
| return; |
| |
| switch (result & 0x7) { |
| 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: |
| ctrl->aen_result = result; |
| break; |
| default: |
| break; |
| } |
| queue_work(nvme_wq, &ctrl->async_event_work); |
| } |
| EXPORT_SYMBOL_GPL(nvme_complete_async_event); |
| |
| void nvme_stop_ctrl(struct nvme_ctrl *ctrl) |
| { |
| nvme_mpath_stop(ctrl); |
| nvme_stop_keep_alive(ctrl); |
| flush_work(&ctrl->async_event_work); |
| cancel_work_sync(&ctrl->fw_act_work); |
| if (ctrl->ops->stop_ctrl) |
| ctrl->ops->stop_ctrl(ctrl); |
| } |
| EXPORT_SYMBOL_GPL(nvme_stop_ctrl); |
| |
| void nvme_start_ctrl(struct nvme_ctrl *ctrl) |
| { |
| if (ctrl->kato) |
| nvme_start_keep_alive(ctrl); |
| |
| if (ctrl->queue_count > 1) { |
| nvme_queue_scan(ctrl); |
| nvme_enable_aen(ctrl); |
| queue_work(nvme_wq, &ctrl->async_event_work); |
| nvme_start_queues(ctrl); |
| } |
| } |
| EXPORT_SYMBOL_GPL(nvme_start_ctrl); |
| |
| void nvme_uninit_ctrl(struct nvme_ctrl *ctrl) |
| { |
| dev_pm_qos_hide_latency_tolerance(ctrl->device); |
| cdev_device_del(&ctrl->cdev, ctrl->device); |
| } |
| EXPORT_SYMBOL_GPL(nvme_uninit_ctrl); |
| |
| static void nvme_free_ctrl(struct device *dev) |
| { |
| struct nvme_ctrl *ctrl = |
| container_of(dev, struct nvme_ctrl, ctrl_device); |
| struct nvme_subsystem *subsys = ctrl->subsys; |
| |
| ida_simple_remove(&nvme_instance_ida, ctrl->instance); |
| kfree(ctrl->effects); |
| nvme_mpath_uninit(ctrl); |
| __free_page(ctrl->discard_page); |
| |
| if (subsys) { |
| mutex_lock(&subsys->lock); |
| list_del(&ctrl->subsys_entry); |
| mutex_unlock(&subsys->lock); |
| sysfs_remove_link(&subsys->dev.kobj, dev_name(ctrl->device)); |
| } |
| |
| ctrl->ops->free_ctrl(ctrl); |
| |
| if (subsys) |
| nvme_put_subsystem(subsys); |
| } |
| |
| /* |
| * Initialize a NVMe controller structures. This needs to be called during |
| * earliest initialization so that we have the initialized structured around |
| * during probing. |
| */ |
| int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev, |
| const struct nvme_ctrl_ops *ops, unsigned long quirks) |
| { |
| int ret; |
| |
| ctrl->state = NVME_CTRL_NEW; |
| spin_lock_init(&ctrl->lock); |
| mutex_init(&ctrl->scan_lock); |
| INIT_LIST_HEAD(&ctrl->namespaces); |
| init_rwsem(&ctrl->namespaces_rwsem); |
| ctrl->dev = dev; |
| ctrl->ops = ops; |
| ctrl->quirks = quirks; |
| INIT_WORK(&ctrl->scan_work, nvme_scan_work); |
| INIT_WORK(&ctrl->async_event_work, nvme_async_event_work); |
| INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work); |
| INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work); |
| |
| INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work); |
| memset(&ctrl->ka_cmd, 0, sizeof(ctrl->ka_cmd)); |
| ctrl->ka_cmd.common.opcode = nvme_admin_keep_alive; |
| |
| BUILD_BUG_ON(NVME_DSM_MAX_RANGES * sizeof(struct nvme_dsm_range) > |
| PAGE_SIZE); |
| ctrl->discard_page = alloc_page(GFP_KERNEL); |
| if (!ctrl->discard_page) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL); |
| if (ret < 0) |
| goto out; |
| ctrl->instance = ret; |
| |
| device_initialize(&ctrl->ctrl_device); |
| ctrl->device = &ctrl->ctrl_device; |
| ctrl->device->devt = MKDEV(MAJOR(nvme_chr_devt), ctrl->instance); |
| ctrl->device->class = nvme_class; |
| ctrl->device->parent = ctrl->dev; |
| ctrl->device->groups = nvme_dev_attr_groups; |
| ctrl->device->release = nvme_free_ctrl; |
| dev_set_drvdata(ctrl->device, ctrl); |
| ret = dev_set_name(ctrl->device, "nvme%d", ctrl->instance); |
| if (ret) |
| goto out_release_instance; |
| |
| cdev_init(&ctrl->cdev, &nvme_dev_fops); |
| ctrl->cdev.owner = ops->module; |
| ret = cdev_device_add(&ctrl->cdev, ctrl->device); |
| if (ret) |
| goto out_free_name; |
| |
| /* |
| * Initialize latency tolerance controls. The sysfs files won't |
| * be visible to userspace unless the device actually supports APST. |
| */ |
| ctrl->device->power.set_latency_tolerance = nvme_set_latency_tolerance; |
| dev_pm_qos_update_user_latency_tolerance(ctrl->device, |
| min(default_ps_max_latency_us, (unsigned long)S32_MAX)); |
| |
| return 0; |
| out_free_name: |
| kfree_const(ctrl->device->kobj.name); |
| out_release_instance: |
| ida_simple_remove(&nvme_instance_ida, ctrl->instance); |
| out: |
| if (ctrl->discard_page) |
| __free_page(ctrl->discard_page); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(nvme_init_ctrl); |
| |
| /** |
| * nvme_kill_queues(): Ends all namespace queues |
| * @ctrl: the dead controller that needs to end |
| * |
| * Call this function when the driver determines it is unable to get the |
| * controller in a state capable of servicing IO. |
| */ |
| void nvme_kill_queues(struct nvme_ctrl *ctrl) |
| { |
| struct nvme_ns *ns; |
| |
| down_read(&ctrl->namespaces_rwsem); |
| |
| /* Forcibly unquiesce queues to avoid blocking dispatch */ |
| if (ctrl->admin_q && !blk_queue_dying(ctrl->admin_q)) |
| blk_mq_unquiesce_queue(ctrl->admin_q); |
| |
| list_for_each_entry(ns, &ctrl->namespaces, list) |
| nvme_set_queue_dying(ns); |
| |
| up_read(&ctrl->namespaces_rwsem); |
| } |
| EXPORT_SYMBOL_GPL(nvme_kill_queues); |
| |
| void nvme_unfreeze(struct nvme_ctrl *ctrl) |
| { |
| struct nvme_ns *ns; |
| |
| down_read(&ctrl->namespaces_rwsem); |
| list_for_each_entry(ns, &ctrl->namespaces, list) |
| blk_mq_unfreeze_queue(ns->queue); |
| up_read(&ctrl->namespaces_rwsem); |
| } |
| EXPORT_SYMBOL_GPL(nvme_unfreeze); |
| |
| void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout) |
| { |
| struct nvme_ns *ns; |
| |
| down_read(&ctrl->namespaces_rwsem); |
| list_for_each_entry(ns, &ctrl->namespaces, list) { |
| timeout = blk_mq_freeze_queue_wait_timeout(ns->queue, timeout); |
| if (timeout <= 0) |
| break; |
| } |
| up_read(&ctrl->namespaces_rwsem); |
| } |
| EXPORT_SYMBOL_GPL(nvme_wait_freeze_timeout); |
| |
| void nvme_wait_freeze(struct nvme_ctrl *ctrl) |
| { |
| struct nvme_ns *ns; |
| |
| down_read(&ctrl->namespaces_rwsem); |
| list_for_each_entry(ns, &ctrl->namespaces, list) |
| blk_mq_freeze_queue_wait(ns->queue); |
| up_read(&ctrl->namespaces_rwsem); |
| } |
| EXPORT_SYMBOL_GPL(nvme_wait_freeze); |
| |
| void nvme_start_freeze(struct nvme_ctrl *ctrl) |
| { |
| struct nvme_ns *ns; |
| |
| down_read(&ctrl->namespaces_rwsem); |
| list_for_each_entry(ns, &ctrl->namespaces, list) |
| blk_freeze_queue_start(ns->queue); |
| up_read(&ctrl->namespaces_rwsem); |
| } |
| EXPORT_SYMBOL_GPL(nvme_start_freeze); |
| |
| void nvme_stop_queues(struct nvme_ctrl *ctrl) |
| { |
| struct nvme_ns *ns; |
| |
| down_read(&ctrl->namespaces_rwsem); |
| list_for_each_entry(ns, &ctrl->namespaces, list) |
| blk_mq_quiesce_queue(ns->queue); |
| up_read(&ctrl->namespaces_rwsem); |
| } |
| EXPORT_SYMBOL_GPL(nvme_stop_queues); |
| |
| void nvme_start_queues(struct nvme_ctrl *ctrl) |
| { |
| struct nvme_ns *ns; |
| |
| down_read(&ctrl->namespaces_rwsem); |
| list_for_each_entry(ns, &ctrl->namespaces, list) |
| blk_mq_unquiesce_queue(ns->queue); |
| up_read(&ctrl->namespaces_rwsem); |
| } |
| EXPORT_SYMBOL_GPL(nvme_start_queues); |
| |
| int __init nvme_core_init(void) |
| { |
| int result = -ENOMEM; |
| |
| nvme_wq = alloc_workqueue("nvme-wq", |
| WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0); |
| if (!nvme_wq) |
| goto out; |
| |
| nvme_reset_wq = alloc_workqueue("nvme-reset-wq", |
| WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0); |
| if (!nvme_reset_wq) |
| goto destroy_wq; |
| |
| nvme_delete_wq = alloc_workqueue("nvme-delete-wq", |
| WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0); |
| if (!nvme_delete_wq) |
| goto destroy_reset_wq; |
| |
| result = alloc_chrdev_region(&nvme_chr_devt, 0, NVME_MINORS, "nvme"); |
| if (result < 0) |
| goto destroy_delete_wq; |
| |
| nvme_class = class_create(THIS_MODULE, "nvme"); |
| if (IS_ERR(nvme_class)) { |
| result = PTR_ERR(nvme_class); |
| goto unregister_chrdev; |
| } |
| |
| nvme_subsys_class = class_create(THIS_MODULE, "nvme-subsystem"); |
| if (IS_ERR(nvme_subsys_class)) { |
| result = PTR_ERR(nvme_subsys_class); |
| goto destroy_class; |
| } |
| return 0; |
| |
| destroy_class: |
| class_destroy(nvme_class); |
| unregister_chrdev: |
| unregister_chrdev_region(nvme_chr_devt, NVME_MINORS); |
| destroy_delete_wq: |
| destroy_workqueue(nvme_delete_wq); |
| destroy_reset_wq: |
| destroy_workqueue(nvme_reset_wq); |
| destroy_wq: |
| destroy_workqueue(nvme_wq); |
| out: |
| return result; |
| } |
| |
| void nvme_core_exit(void) |
| { |
| ida_destroy(&nvme_subsystems_ida); |
| class_destroy(nvme_subsys_class); |
| class_destroy(nvme_class); |
| unregister_chrdev_region(nvme_chr_devt, NVME_MINORS); |
| destroy_workqueue(nvme_delete_wq); |
| destroy_workqueue(nvme_reset_wq); |
| destroy_workqueue(nvme_wq); |
| } |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_VERSION("1.0"); |
| module_init(nvme_core_init); |
| module_exit(nvme_core_exit); |