| /* |
| * 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 <scsi/sg.h> |
| #include <asm/unaligned.h> |
| |
| #include "nvme.h" |
| #include "fabrics.h" |
| |
| #define NVME_MINORS (1U << MINORBITS) |
| |
| unsigned char admin_timeout = 60; |
| module_param(admin_timeout, byte, 0644); |
| MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands"); |
| EXPORT_SYMBOL_GPL(admin_timeout); |
| |
| unsigned char nvme_io_timeout = 30; |
| module_param_named(io_timeout, nvme_io_timeout, byte, 0644); |
| MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O"); |
| EXPORT_SYMBOL_GPL(nvme_io_timeout); |
| |
| unsigned char shutdown_timeout = 5; |
| module_param(shutdown_timeout, byte, 0644); |
| MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown"); |
| |
| unsigned int nvme_max_retries = 5; |
| module_param_named(max_retries, nvme_max_retries, uint, 0644); |
| MODULE_PARM_DESC(max_retries, "max number of retries a command may have"); |
| EXPORT_SYMBOL_GPL(nvme_max_retries); |
| |
| static int nvme_char_major; |
| module_param(nvme_char_major, int, 0); |
| |
| static LIST_HEAD(nvme_ctrl_list); |
| static DEFINE_SPINLOCK(dev_list_lock); |
| |
| static struct class *nvme_class; |
| |
| void nvme_cancel_request(struct request *req, void *data, bool reserved) |
| { |
| int status; |
| |
| if (!blk_mq_request_started(req)) |
| return; |
| |
| dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device, |
| "Cancelling I/O %d", req->tag); |
| |
| status = NVME_SC_ABORT_REQ; |
| if (blk_queue_dying(req->q)) |
| status |= NVME_SC_DNR; |
| blk_mq_complete_request(req, status); |
| } |
| 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 = ctrl->state; |
| bool changed = false; |
| |
| spin_lock_irq(&ctrl->lock); |
| switch (new_state) { |
| case NVME_CTRL_LIVE: |
| switch (old_state) { |
| case NVME_CTRL_NEW: |
| case NVME_CTRL_RESETTING: |
| case NVME_CTRL_RECONNECTING: |
| changed = true; |
| /* FALLTHRU */ |
| default: |
| break; |
| } |
| break; |
| case NVME_CTRL_RESETTING: |
| switch (old_state) { |
| case NVME_CTRL_NEW: |
| case NVME_CTRL_LIVE: |
| case NVME_CTRL_RECONNECTING: |
| changed = true; |
| /* FALLTHRU */ |
| default: |
| break; |
| } |
| break; |
| case NVME_CTRL_RECONNECTING: |
| switch (old_state) { |
| case NVME_CTRL_LIVE: |
| changed = true; |
| /* FALLTHRU */ |
| default: |
| break; |
| } |
| break; |
| case NVME_CTRL_DELETING: |
| switch (old_state) { |
| case NVME_CTRL_LIVE: |
| case NVME_CTRL_RESETTING: |
| case NVME_CTRL_RECONNECTING: |
| 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; |
| } |
| spin_unlock_irq(&ctrl->lock); |
| |
| if (changed) |
| ctrl->state = new_state; |
| |
| return changed; |
| } |
| EXPORT_SYMBOL_GPL(nvme_change_ctrl_state); |
| |
| static void nvme_free_ns(struct kref *kref) |
| { |
| struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref); |
| |
| if (ns->type == NVME_NS_LIGHTNVM) |
| nvme_nvm_unregister(ns->queue, ns->disk->disk_name); |
| |
| spin_lock(&dev_list_lock); |
| ns->disk->private_data = NULL; |
| spin_unlock(&dev_list_lock); |
| |
| put_disk(ns->disk); |
| ida_simple_remove(&ns->ctrl->ns_ida, ns->instance); |
| nvme_put_ctrl(ns->ctrl); |
| kfree(ns); |
| } |
| |
| static void nvme_put_ns(struct nvme_ns *ns) |
| { |
| kref_put(&ns->kref, nvme_free_ns); |
| } |
| |
| static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk) |
| { |
| struct nvme_ns *ns; |
| |
| spin_lock(&dev_list_lock); |
| ns = disk->private_data; |
| if (ns) { |
| if (!kref_get_unless_zero(&ns->kref)) |
| goto fail; |
| if (!try_module_get(ns->ctrl->ops->module)) |
| goto fail_put_ns; |
| } |
| spin_unlock(&dev_list_lock); |
| |
| return ns; |
| |
| fail_put_ns: |
| kref_put(&ns->kref, nvme_free_ns); |
| fail: |
| spin_unlock(&dev_list_lock); |
| return NULL; |
| } |
| |
| void nvme_requeue_req(struct request *req) |
| { |
| unsigned long flags; |
| |
| blk_mq_requeue_request(req); |
| spin_lock_irqsave(req->q->queue_lock, flags); |
| if (!blk_queue_stopped(req->q)) |
| blk_mq_kick_requeue_list(req->q); |
| spin_unlock_irqrestore(req->q->queue_lock, flags); |
| } |
| EXPORT_SYMBOL_GPL(nvme_requeue_req); |
| |
| struct request *nvme_alloc_request(struct request_queue *q, |
| struct nvme_command *cmd, unsigned int flags, int qid) |
| { |
| struct request *req; |
| |
| if (qid == NVME_QID_ANY) { |
| req = blk_mq_alloc_request(q, nvme_is_write(cmd), flags); |
| } else { |
| req = blk_mq_alloc_request_hctx(q, nvme_is_write(cmd), flags, |
| qid ? qid - 1 : 0); |
| } |
| if (IS_ERR(req)) |
| return req; |
| |
| req->cmd_type = REQ_TYPE_DRV_PRIV; |
| req->cmd_flags |= REQ_FAILFAST_DRIVER; |
| req->cmd = (unsigned char *)cmd; |
| req->cmd_len = sizeof(struct nvme_command); |
| |
| return req; |
| } |
| EXPORT_SYMBOL_GPL(nvme_alloc_request); |
| |
| 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->ns_id); |
| } |
| |
| static inline int nvme_setup_discard(struct nvme_ns *ns, struct request *req, |
| struct nvme_command *cmnd) |
| { |
| struct nvme_dsm_range *range; |
| struct page *page; |
| int offset; |
| unsigned int nr_bytes = blk_rq_bytes(req); |
| |
| range = kmalloc(sizeof(*range), GFP_ATOMIC); |
| if (!range) |
| return BLK_MQ_RQ_QUEUE_BUSY; |
| |
| range->cattr = cpu_to_le32(0); |
| range->nlb = cpu_to_le32(nr_bytes >> ns->lba_shift); |
| range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); |
| |
| memset(cmnd, 0, sizeof(*cmnd)); |
| cmnd->dsm.opcode = nvme_cmd_dsm; |
| cmnd->dsm.nsid = cpu_to_le32(ns->ns_id); |
| cmnd->dsm.nr = 0; |
| cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); |
| |
| req->completion_data = range; |
| page = virt_to_page(range); |
| offset = offset_in_page(range); |
| blk_add_request_payload(req, page, offset, sizeof(*range)); |
| |
| /* |
| * we set __data_len back to the size of the area to be discarded |
| * on disk. This allows us to report completion on the full amount |
| * of blocks described by the request. |
| */ |
| req->__data_len = nr_bytes; |
| |
| return 0; |
| } |
| |
| static inline void nvme_setup_rw(struct nvme_ns *ns, struct request *req, |
| struct nvme_command *cmnd) |
| { |
| 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.command_id = req->tag; |
| cmnd->rw.nsid = cpu_to_le32(ns->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 (ns->ms) { |
| 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( |
| nvme_block_nr(ns, blk_rq_pos(req))); |
| break; |
| } |
| if (!blk_integrity_rq(req)) |
| control |= NVME_RW_PRINFO_PRACT; |
| } |
| |
| cmnd->rw.control = cpu_to_le16(control); |
| cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt); |
| } |
| |
| int nvme_setup_cmd(struct nvme_ns *ns, struct request *req, |
| struct nvme_command *cmd) |
| { |
| int ret = 0; |
| |
| if (req->cmd_type == REQ_TYPE_DRV_PRIV) |
| memcpy(cmd, req->cmd, sizeof(*cmd)); |
| else if (req_op(req) == REQ_OP_FLUSH) |
| nvme_setup_flush(ns, cmd); |
| else if (req_op(req) == REQ_OP_DISCARD) |
| ret = nvme_setup_discard(ns, req, cmd); |
| else |
| nvme_setup_rw(ns, 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, |
| struct nvme_completion *cqe, void *buffer, unsigned bufflen, |
| unsigned timeout, int qid, int at_head, int 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; |
| req->special = cqe; |
| |
| 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); |
| ret = req->errors; |
| 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); |
| |
| 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_completion cqe; |
| 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; |
| req->special = &cqe; |
| |
| if (ubuffer && bufflen) { |
| ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, |
| GFP_KERNEL); |
| if (ret) |
| goto out; |
| bio = req->bio; |
| |
| if (!disk) |
| goto submit; |
| bio->bi_bdev = bdget_disk(disk, 0); |
| if (!bio->bi_bdev) { |
| ret = -ENODEV; |
| goto out_unmap; |
| } |
| |
| if (meta_buffer && meta_len) { |
| struct bio_integrity_payload *bip; |
| |
| meta = kmalloc(meta_len, GFP_KERNEL); |
| if (!meta) { |
| ret = -ENOMEM; |
| goto out_unmap; |
| } |
| |
| if (write) { |
| if (copy_from_user(meta, meta_buffer, |
| meta_len)) { |
| ret = -EFAULT; |
| 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 = meta_len; |
| bip->bip_iter.bi_sector = meta_seed; |
| |
| ret = bio_integrity_add_page(bio, virt_to_page(meta), |
| meta_len, offset_in_page(meta)); |
| if (ret != meta_len) { |
| ret = -ENOMEM; |
| goto out_free_meta; |
| } |
| } |
| } |
| submit: |
| blk_execute_rq(req->q, disk, req, 0); |
| ret = req->errors; |
| if (result) |
| *result = le32_to_cpu(cqe.result); |
| if (meta && !ret && !write) { |
| if (copy_to_user(meta_buffer, meta, meta_len)) |
| ret = -EFAULT; |
| } |
| out_free_meta: |
| kfree(meta); |
| out_unmap: |
| if (bio) { |
| if (disk && bio->bi_bdev) |
| bdput(bio->bi_bdev); |
| blk_rq_unmap_user(bio); |
| } |
| out: |
| blk_mq_free_request(req); |
| return ret; |
| } |
| |
| int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd, |
| void __user *ubuffer, unsigned bufflen, u32 *result, |
| unsigned timeout) |
| { |
| return __nvme_submit_user_cmd(q, cmd, ubuffer, bufflen, NULL, 0, 0, |
| result, timeout); |
| } |
| |
| static void nvme_keep_alive_end_io(struct request *rq, int error) |
| { |
| struct nvme_ctrl *ctrl = rq->end_io_data; |
| |
| blk_mq_free_request(rq); |
| |
| if (error) { |
| dev_err(ctrl->device, |
| "failed nvme_keep_alive_end_io error=%d\n", error); |
| return; |
| } |
| |
| schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); |
| } |
| |
| static int nvme_keep_alive(struct nvme_ctrl *ctrl) |
| { |
| struct nvme_command c; |
| struct request *rq; |
| |
| memset(&c, 0, sizeof(c)); |
| c.common.opcode = nvme_admin_keep_alive; |
| |
| rq = nvme_alloc_request(ctrl->admin_q, &c, 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"); |
| ctrl->ops->reset_ctrl(ctrl); |
| return; |
| } |
| } |
| |
| void nvme_start_keep_alive(struct nvme_ctrl *ctrl) |
| { |
| if (unlikely(ctrl->kato == 0)) |
| return; |
| |
| INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work); |
| schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); |
| } |
| EXPORT_SYMBOL_GPL(nvme_start_keep_alive); |
| |
| 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); |
| |
| 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 = cpu_to_le32(1); |
| |
| *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_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list) |
| { |
| struct nvme_command c = { }; |
| |
| c.identify.opcode = nvme_admin_identify; |
| c.identify.cns = cpu_to_le32(2); |
| c.identify.nsid = cpu_to_le32(nsid); |
| return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, 0x1000); |
| } |
| |
| int nvme_identify_ns(struct nvme_ctrl *dev, 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), |
| |
| *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL); |
| if (!*id) |
| return -ENOMEM; |
| |
| error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, |
| sizeof(struct nvme_id_ns)); |
| if (error) |
| kfree(*id); |
| return error; |
| } |
| |
| int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid, |
| dma_addr_t dma_addr, u32 *result) |
| { |
| struct nvme_command c; |
| struct nvme_completion cqe; |
| int ret; |
| |
| memset(&c, 0, sizeof(c)); |
| c.features.opcode = nvme_admin_get_features; |
| c.features.nsid = cpu_to_le32(nsid); |
| c.features.dptr.prp1 = cpu_to_le64(dma_addr); |
| c.features.fid = cpu_to_le32(fid); |
| |
| ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &cqe, NULL, 0, 0, |
| NVME_QID_ANY, 0, 0); |
| if (ret >= 0) |
| *result = le32_to_cpu(cqe.result); |
| return ret; |
| } |
| |
| int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11, |
| dma_addr_t dma_addr, u32 *result) |
| { |
| struct nvme_command c; |
| struct nvme_completion cqe; |
| int ret; |
| |
| memset(&c, 0, sizeof(c)); |
| c.features.opcode = nvme_admin_set_features; |
| c.features.dptr.prp1 = cpu_to_le64(dma_addr); |
| c.features.fid = cpu_to_le32(fid); |
| c.features.dword11 = cpu_to_le32(dword11); |
| |
| ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &cqe, NULL, 0, 0, |
| NVME_QID_ANY, 0, 0); |
| if (ret >= 0) |
| *result = le32_to_cpu(cqe.result); |
| return ret; |
| } |
| |
| int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log) |
| { |
| struct nvme_command c = { }; |
| int error; |
| |
| c.common.opcode = nvme_admin_get_log_page, |
| c.common.nsid = cpu_to_le32(0xFFFFFFFF), |
| c.common.cdw10[0] = cpu_to_le32( |
| (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) | |
| NVME_LOG_SMART), |
| |
| *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL); |
| if (!*log) |
| return -ENOMEM; |
| |
| error = nvme_submit_sync_cmd(dev->admin_q, &c, *log, |
| sizeof(struct nvme_smart_log)); |
| if (error) |
| kfree(*log); |
| return error; |
| } |
| |
| 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, 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->dev, "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); |
| |
| 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->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 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; |
| 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); |
| |
| status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, |
| (void __user *)(uintptr_t)cmd.addr, cmd.data_len, |
| &cmd.result, timeout); |
| if (status >= 0) { |
| if (put_user(cmd.result, &ucmd->result)) |
| return -EFAULT; |
| } |
| |
| return status; |
| } |
| |
| static int nvme_ioctl(struct block_device *bdev, fmode_t mode, |
| unsigned int cmd, unsigned long arg) |
| { |
| struct nvme_ns *ns = bdev->bd_disk->private_data; |
| |
| switch (cmd) { |
| case NVME_IOCTL_ID: |
| force_successful_syscall_return(); |
| return ns->ns_id; |
| case NVME_IOCTL_ADMIN_CMD: |
| return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg); |
| case NVME_IOCTL_IO_CMD: |
| return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg); |
| case NVME_IOCTL_SUBMIT_IO: |
| return nvme_submit_io(ns, (void __user *)arg); |
| #ifdef CONFIG_BLK_DEV_NVME_SCSI |
| case SG_GET_VERSION_NUM: |
| return nvme_sg_get_version_num((void __user *)arg); |
| case SG_IO: |
| return nvme_sg_io(ns, (void __user *)arg); |
| #endif |
| default: |
| return -ENOTTY; |
| } |
| } |
| |
| #ifdef CONFIG_COMPAT |
| static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode, |
| unsigned int cmd, unsigned long arg) |
| { |
| switch (cmd) { |
| case SG_IO: |
| return -ENOIOCTLCMD; |
| } |
| return nvme_ioctl(bdev, mode, cmd, arg); |
| } |
| #else |
| #define nvme_compat_ioctl NULL |
| #endif |
| |
| static int nvme_open(struct block_device *bdev, fmode_t mode) |
| { |
| return nvme_get_ns_from_disk(bdev->bd_disk) ? 0 : -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 nvme_ns *ns) |
| { |
| struct blk_integrity integrity; |
| |
| switch (ns->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 = ns->ms; |
| blk_integrity_register(ns->disk, &integrity); |
| blk_queue_max_integrity_segments(ns->queue, 1); |
| } |
| #else |
| static void nvme_init_integrity(struct nvme_ns *ns) |
| { |
| } |
| #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| static void nvme_config_discard(struct nvme_ns *ns) |
| { |
| struct nvme_ctrl *ctrl = ns->ctrl; |
| u32 logical_block_size = queue_logical_block_size(ns->queue); |
| |
| if (ctrl->quirks & NVME_QUIRK_DISCARD_ZEROES) |
| ns->queue->limits.discard_zeroes_data = 1; |
| else |
| ns->queue->limits.discard_zeroes_data = 0; |
| |
| ns->queue->limits.discard_alignment = logical_block_size; |
| ns->queue->limits.discard_granularity = logical_block_size; |
| blk_queue_max_discard_sectors(ns->queue, UINT_MAX); |
| queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue); |
| } |
| |
| static int nvme_revalidate_disk(struct gendisk *disk) |
| { |
| struct nvme_ns *ns = disk->private_data; |
| struct nvme_id_ns *id; |
| u8 lbaf, pi_type; |
| u16 old_ms; |
| unsigned short bs; |
| |
| if (test_bit(NVME_NS_DEAD, &ns->flags)) { |
| set_capacity(disk, 0); |
| return -ENODEV; |
| } |
| if (nvme_identify_ns(ns->ctrl, ns->ns_id, &id)) { |
| dev_warn(disk_to_dev(ns->disk), "%s: Identify failure\n", |
| __func__); |
| return -ENODEV; |
| } |
| if (id->ncap == 0) { |
| kfree(id); |
| return -ENODEV; |
| } |
| |
| if (nvme_nvm_ns_supported(ns, id) && ns->type != NVME_NS_LIGHTNVM) { |
| if (nvme_nvm_register(ns->queue, disk->disk_name)) { |
| dev_warn(disk_to_dev(ns->disk), |
| "%s: LightNVM init failure\n", __func__); |
| kfree(id); |
| return -ENODEV; |
| } |
| ns->type = NVME_NS_LIGHTNVM; |
| } |
| |
| if (ns->ctrl->vs >= NVME_VS(1, 1)) |
| memcpy(ns->eui, id->eui64, sizeof(ns->eui)); |
| if (ns->ctrl->vs >= NVME_VS(1, 2)) |
| memcpy(ns->uuid, id->nguid, sizeof(ns->uuid)); |
| |
| old_ms = ns->ms; |
| lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK; |
| ns->lba_shift = id->lbaf[lbaf].ds; |
| ns->ms = le16_to_cpu(id->lbaf[lbaf].ms); |
| ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT); |
| |
| /* |
| * If identify namespace failed, use default 512 byte block size so |
| * block layer can use before failing read/write for 0 capacity. |
| */ |
| if (ns->lba_shift == 0) |
| ns->lba_shift = 9; |
| bs = 1 << ns->lba_shift; |
| /* XXX: PI implementation requires metadata equal t10 pi tuple size */ |
| pi_type = ns->ms == sizeof(struct t10_pi_tuple) ? |
| id->dps & NVME_NS_DPS_PI_MASK : 0; |
| |
| blk_mq_freeze_queue(disk->queue); |
| if (blk_get_integrity(disk) && (ns->pi_type != pi_type || |
| ns->ms != old_ms || |
| bs != queue_logical_block_size(disk->queue) || |
| (ns->ms && ns->ext))) |
| blk_integrity_unregister(disk); |
| |
| ns->pi_type = pi_type; |
| blk_queue_logical_block_size(ns->queue, bs); |
| |
| if (ns->ms && !blk_get_integrity(disk) && !ns->ext) |
| nvme_init_integrity(ns); |
| if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk)) |
| set_capacity(disk, 0); |
| else |
| set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9)); |
| |
| if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM) |
| nvme_config_discard(ns); |
| blk_mq_unfreeze_queue(disk->queue); |
| |
| kfree(id); |
| return 0; |
| } |
| |
| 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 *ns = bdev->bd_disk->private_data; |
| struct nvme_command c; |
| u8 data[16] = { 0, }; |
| |
| 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->ns_id); |
| c.common.cdw10[0] = cpu_to_le32(cdw10); |
| |
| return nvme_submit_sync_cmd(ns->queue, &c, data, 16); |
| } |
| |
| 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, |
| }; |
| |
| static const struct block_device_operations nvme_fops = { |
| .owner = THIS_MODULE, |
| .ioctl = nvme_ioctl, |
| .compat_ioctl = nvme_compat_ioctl, |
| .open = nvme_open, |
| .release = nvme_release, |
| .getgeo = nvme_getgeo, |
| .revalidate_disk= nvme_revalidate_disk, |
| .pr_ops = &nvme_pr_ops, |
| }; |
| |
| static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled) |
| { |
| unsigned long timeout = |
| ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies; |
| u32 csts, bit = enabled ? NVME_CSTS_RDY : 0; |
| int ret; |
| |
| while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) { |
| if ((csts & 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; |
| |
| /* Checking for ctrl->tagset is a trick to avoid sleeping on module |
| * load, since we only need the quirk on reset_controller. Notice |
| * that the HGST device needs this delay only in firmware activation |
| * procedure; unfortunately we have no (easy) way to verify this. |
| */ |
| if ((ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY) && ctrl->tagset) |
| 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_ARB_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 = SHUTDOWN_TIMEOUT + jiffies; |
| 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; |
| |
| blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors); |
| blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX)); |
| } |
| if (ctrl->stripe_size) |
| blk_queue_chunk_sectors(q, ctrl->stripe_size >> 9); |
| 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); |
| } |
| |
| /* |
| * 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; |
| |
| 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)) |
| 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; |
| } |
| |
| ctrl->vid = le16_to_cpu(id->vid); |
| ctrl->oncs = le16_to_cpup(&id->oncs); |
| atomic_set(&ctrl->abort_limit, id->acl + 1); |
| ctrl->vwc = id->vwc; |
| ctrl->cntlid = le16_to_cpup(&id->cntlid); |
| memcpy(ctrl->serial, id->sn, sizeof(id->sn)); |
| memcpy(ctrl->model, id->mn, sizeof(id->mn)); |
| memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr)); |
| 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); |
| |
| if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && id->vs[3]) { |
| unsigned int max_hw_sectors; |
| |
| ctrl->stripe_size = 1 << (id->vs[3] + page_shift); |
| max_hw_sectors = ctrl->stripe_size >> (page_shift - 9); |
| if (ctrl->max_hw_sectors) { |
| ctrl->max_hw_sectors = min(max_hw_sectors, |
| ctrl->max_hw_sectors); |
| } else { |
| 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); |
| |
| if (ctrl->ops->is_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; |
| |
| if (!ctrl->opts->discovery_nqn && !ctrl->kas) { |
| dev_err(ctrl->dev, |
| "keep-alive support is mandatory for fabrics\n"); |
| ret = -EINVAL; |
| } |
| } else { |
| ctrl->cntlid = le16_to_cpu(id->cntlid); |
| } |
| |
| 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; |
| int instance = iminor(inode); |
| int ret = -ENODEV; |
| |
| spin_lock(&dev_list_lock); |
| list_for_each_entry(ctrl, &nvme_ctrl_list, node) { |
| if (ctrl->instance != instance) |
| continue; |
| |
| if (!ctrl->admin_q) { |
| ret = -EWOULDBLOCK; |
| break; |
| } |
| if (!kref_get_unless_zero(&ctrl->kref)) |
| break; |
| file->private_data = ctrl; |
| ret = 0; |
| break; |
| } |
| spin_unlock(&dev_list_lock); |
| |
| return ret; |
| } |
| |
| static int nvme_dev_release(struct inode *inode, struct file *file) |
| { |
| nvme_put_ctrl(file->private_data); |
| return 0; |
| } |
| |
| static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp) |
| { |
| struct nvme_ns *ns; |
| int ret; |
| |
| mutex_lock(&ctrl->namespaces_mutex); |
| 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); |
| mutex_unlock(&ctrl->namespaces_mutex); |
| |
| ret = nvme_user_cmd(ctrl, ns, argp); |
| nvme_put_ns(ns); |
| return ret; |
| |
| out_unlock: |
| mutex_unlock(&ctrl->namespaces_mutex); |
| 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 ctrl->ops->reset_ctrl(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, |
| .release = nvme_dev_release, |
| .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 = ctrl->ops->reset_ctrl(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 ssize_t wwid_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct nvme_ns *ns = dev_to_disk(dev)->private_data; |
| struct nvme_ctrl *ctrl = ns->ctrl; |
| int serial_len = sizeof(ctrl->serial); |
| int model_len = sizeof(ctrl->model); |
| |
| if (memchr_inv(ns->uuid, 0, sizeof(ns->uuid))) |
| return sprintf(buf, "eui.%16phN\n", ns->uuid); |
| |
| if (memchr_inv(ns->eui, 0, sizeof(ns->eui))) |
| return sprintf(buf, "eui.%8phN\n", ns->eui); |
| |
| while (ctrl->serial[serial_len - 1] == ' ') |
| serial_len--; |
| while (ctrl->model[model_len - 1] == ' ') |
| model_len--; |
| |
| return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", ctrl->vid, |
| serial_len, ctrl->serial, model_len, ctrl->model, ns->ns_id); |
| } |
| static DEVICE_ATTR(wwid, S_IRUGO, wwid_show, NULL); |
| |
| static ssize_t uuid_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct nvme_ns *ns = dev_to_disk(dev)->private_data; |
| return sprintf(buf, "%pU\n", ns->uuid); |
| } |
| static DEVICE_ATTR(uuid, S_IRUGO, uuid_show, NULL); |
| |
| static ssize_t eui_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct nvme_ns *ns = dev_to_disk(dev)->private_data; |
| return sprintf(buf, "%8phd\n", ns->eui); |
| } |
| static DEVICE_ATTR(eui, S_IRUGO, eui_show, NULL); |
| |
| static ssize_t nsid_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct nvme_ns *ns = dev_to_disk(dev)->private_data; |
| return sprintf(buf, "%d\n", ns->ns_id); |
| } |
| static DEVICE_ATTR(nsid, S_IRUGO, nsid_show, NULL); |
| |
| static struct attribute *nvme_ns_attrs[] = { |
| &dev_attr_wwid.attr, |
| &dev_attr_uuid.attr, |
| &dev_attr_eui.attr, |
| &dev_attr_nsid.attr, |
| NULL, |
| }; |
| |
| static umode_t nvme_ns_attrs_are_visible(struct kobject *kobj, |
| struct attribute *a, int n) |
| { |
| struct device *dev = container_of(kobj, struct device, kobj); |
| struct nvme_ns *ns = dev_to_disk(dev)->private_data; |
| |
| if (a == &dev_attr_uuid.attr) { |
| if (!memchr_inv(ns->uuid, 0, sizeof(ns->uuid))) |
| return 0; |
| } |
| if (a == &dev_attr_eui.attr) { |
| if (!memchr_inv(ns->eui, 0, sizeof(ns->eui))) |
| return 0; |
| } |
| return a->mode; |
| } |
| |
| static const struct attribute_group nvme_ns_attr_group = { |
| .attrs = nvme_ns_attrs, |
| .is_visible = nvme_ns_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->field), ctrl->field); \ |
| } \ |
| static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL); |
| |
| #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_str_function(model); |
| nvme_show_str_function(serial); |
| nvme_show_str_function(firmware_rev); |
| 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)) |
| ctrl->ops->delete_ctrl(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_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->ops->get_subsysnqn(ctrl)); |
| } |
| 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, |
| NULL |
| }; |
| |
| #define CHECK_ATTR(ctrl, a, name) \ |
| if ((a) == &dev_attr_##name.attr && \ |
| !(ctrl)->ops->get_##name) \ |
| return 0 |
| |
| 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) { |
| if (!ctrl->ops->delete_ctrl) |
| return 0; |
| } |
| |
| CHECK_ATTR(ctrl, a, subsysnqn); |
| CHECK_ATTR(ctrl, a, address); |
| |
| 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 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->ns_id - nsb->ns_id; |
| } |
| |
| static struct nvme_ns *nvme_find_ns(struct nvme_ctrl *ctrl, unsigned nsid) |
| { |
| struct nvme_ns *ns; |
| |
| lockdep_assert_held(&ctrl->namespaces_mutex); |
| |
| list_for_each_entry(ns, &ctrl->namespaces, list) { |
| if (ns->ns_id == nsid) |
| return ns; |
| if (ns->ns_id > nsid) |
| break; |
| } |
| return NULL; |
| } |
| |
| static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) |
| { |
| struct nvme_ns *ns; |
| struct gendisk *disk; |
| int node = dev_to_node(ctrl->dev); |
| |
| lockdep_assert_held(&ctrl->namespaces_mutex); |
| |
| ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node); |
| if (!ns) |
| return; |
| |
| ns->instance = ida_simple_get(&ctrl->ns_ida, 1, 0, GFP_KERNEL); |
| if (ns->instance < 0) |
| goto out_free_ns; |
| |
| ns->queue = blk_mq_init_queue(ctrl->tagset); |
| if (IS_ERR(ns->queue)) |
| goto out_release_instance; |
| queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue); |
| ns->queue->queuedata = ns; |
| ns->ctrl = ctrl; |
| |
| disk = alloc_disk_node(0, node); |
| if (!disk) |
| goto out_free_queue; |
| |
| kref_init(&ns->kref); |
| ns->ns_id = nsid; |
| ns->disk = disk; |
| 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); |
| |
| disk->fops = &nvme_fops; |
| disk->private_data = ns; |
| disk->queue = ns->queue; |
| disk->flags = GENHD_FL_EXT_DEVT; |
| sprintf(disk->disk_name, "nvme%dn%d", ctrl->instance, ns->instance); |
| |
| if (nvme_revalidate_disk(ns->disk)) |
| goto out_free_disk; |
| |
| list_add_tail_rcu(&ns->list, &ctrl->namespaces); |
| kref_get(&ctrl->kref); |
| if (ns->type == NVME_NS_LIGHTNVM) |
| return; |
| |
| device_add_disk(ctrl->device, ns->disk); |
| if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj, |
| &nvme_ns_attr_group)) |
| pr_warn("%s: failed to create sysfs group for identification\n", |
| ns->disk->disk_name); |
| return; |
| out_free_disk: |
| kfree(disk); |
| out_free_queue: |
| blk_cleanup_queue(ns->queue); |
| out_release_instance: |
| ida_simple_remove(&ctrl->ns_ida, ns->instance); |
| out_free_ns: |
| kfree(ns); |
| } |
| |
| static void nvme_ns_remove(struct nvme_ns *ns) |
| { |
| lockdep_assert_held(&ns->ctrl->namespaces_mutex); |
| |
| if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags)) |
| return; |
| |
| if (ns->disk->flags & GENHD_FL_UP) { |
| if (blk_get_integrity(ns->disk)) |
| blk_integrity_unregister(ns->disk); |
| sysfs_remove_group(&disk_to_dev(ns->disk)->kobj, |
| &nvme_ns_attr_group); |
| del_gendisk(ns->disk); |
| blk_mq_abort_requeue_list(ns->queue); |
| blk_cleanup_queue(ns->queue); |
| } |
| list_del_init(&ns->list); |
| synchronize_rcu(); |
| nvme_put_ns(ns); |
| } |
| |
| static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid) |
| { |
| struct nvme_ns *ns; |
| |
| ns = nvme_find_ns(ctrl, nsid); |
| if (ns) { |
| if (revalidate_disk(ns->disk)) |
| nvme_ns_remove(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_for_each_entry_safe(ns, next, &ctrl->namespaces, list) { |
| if (ns->ns_id > nsid) |
| nvme_ns_remove(ns); |
| } |
| } |
| |
| static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn) |
| { |
| struct nvme_ns *ns; |
| __le32 *ns_list; |
| unsigned i, j, nsid, prev = 0, num_lists = DIV_ROUND_UP(nn, 1024); |
| int ret = 0; |
| |
| ns_list = kzalloc(0x1000, 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_ns(ctrl, prev); |
| if (ns) |
| nvme_ns_remove(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; |
| |
| lockdep_assert_held(&ctrl->namespaces_mutex); |
| |
| for (i = 1; i <= nn; i++) |
| nvme_validate_ns(ctrl, i); |
| |
| nvme_remove_invalid_namespaces(ctrl, nn); |
| } |
| |
| 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; |
| |
| if (nvme_identify_ctrl(ctrl, &id)) |
| return; |
| |
| mutex_lock(&ctrl->namespaces_mutex); |
| nn = le32_to_cpu(id->nn); |
| if (ctrl->vs >= NVME_VS(1, 1) && |
| !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) { |
| if (!nvme_scan_ns_list(ctrl, nn)) |
| goto done; |
| } |
| nvme_scan_ns_sequential(ctrl, nn); |
| done: |
| list_sort(NULL, &ctrl->namespaces, ns_cmp); |
| mutex_unlock(&ctrl->namespaces_mutex); |
| kfree(id); |
| |
| if (ctrl->ops->post_scan) |
| ctrl->ops->post_scan(ctrl); |
| } |
| |
| void nvme_queue_scan(struct nvme_ctrl *ctrl) |
| { |
| /* |
| * Do not queue new scan work when a controller is reset during |
| * removal. |
| */ |
| if (ctrl->state == NVME_CTRL_LIVE) |
| schedule_work(&ctrl->scan_work); |
| } |
| EXPORT_SYMBOL_GPL(nvme_queue_scan); |
| |
| void nvme_remove_namespaces(struct nvme_ctrl *ctrl) |
| { |
| struct nvme_ns *ns, *next; |
| |
| /* |
| * 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); |
| |
| mutex_lock(&ctrl->namespaces_mutex); |
| list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) |
| nvme_ns_remove(ns); |
| mutex_unlock(&ctrl->namespaces_mutex); |
| } |
| EXPORT_SYMBOL_GPL(nvme_remove_namespaces); |
| |
| static void nvme_async_event_work(struct work_struct *work) |
| { |
| struct nvme_ctrl *ctrl = |
| container_of(work, struct nvme_ctrl, async_event_work); |
| |
| spin_lock_irq(&ctrl->lock); |
| while (ctrl->event_limit > 0) { |
| int aer_idx = --ctrl->event_limit; |
| |
| spin_unlock_irq(&ctrl->lock); |
| ctrl->ops->submit_async_event(ctrl, aer_idx); |
| spin_lock_irq(&ctrl->lock); |
| } |
| spin_unlock_irq(&ctrl->lock); |
| } |
| |
| void nvme_complete_async_event(struct nvme_ctrl *ctrl, |
| struct nvme_completion *cqe) |
| { |
| u16 status = le16_to_cpu(cqe->status) >> 1; |
| u32 result = le32_to_cpu(cqe->result); |
| |
| if (status == NVME_SC_SUCCESS || status == NVME_SC_ABORT_REQ) { |
| ++ctrl->event_limit; |
| schedule_work(&ctrl->async_event_work); |
| } |
| |
| if (status != NVME_SC_SUCCESS) |
| return; |
| |
| switch (result & 0xff07) { |
| case NVME_AER_NOTICE_NS_CHANGED: |
| dev_info(ctrl->device, "rescanning\n"); |
| nvme_queue_scan(ctrl); |
| break; |
| default: |
| dev_warn(ctrl->device, "async event result %08x\n", result); |
| } |
| } |
| EXPORT_SYMBOL_GPL(nvme_complete_async_event); |
| |
| void nvme_queue_async_events(struct nvme_ctrl *ctrl) |
| { |
| ctrl->event_limit = NVME_NR_AERS; |
| schedule_work(&ctrl->async_event_work); |
| } |
| EXPORT_SYMBOL_GPL(nvme_queue_async_events); |
| |
| static DEFINE_IDA(nvme_instance_ida); |
| |
| static int nvme_set_instance(struct nvme_ctrl *ctrl) |
| { |
| int instance, error; |
| |
| do { |
| if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL)) |
| return -ENODEV; |
| |
| spin_lock(&dev_list_lock); |
| error = ida_get_new(&nvme_instance_ida, &instance); |
| spin_unlock(&dev_list_lock); |
| } while (error == -EAGAIN); |
| |
| if (error) |
| return -ENODEV; |
| |
| ctrl->instance = instance; |
| return 0; |
| } |
| |
| static void nvme_release_instance(struct nvme_ctrl *ctrl) |
| { |
| spin_lock(&dev_list_lock); |
| ida_remove(&nvme_instance_ida, ctrl->instance); |
| spin_unlock(&dev_list_lock); |
| } |
| |
| void nvme_uninit_ctrl(struct nvme_ctrl *ctrl) |
| { |
| flush_work(&ctrl->async_event_work); |
| flush_work(&ctrl->scan_work); |
| nvme_remove_namespaces(ctrl); |
| |
| device_destroy(nvme_class, MKDEV(nvme_char_major, ctrl->instance)); |
| |
| spin_lock(&dev_list_lock); |
| list_del(&ctrl->node); |
| spin_unlock(&dev_list_lock); |
| } |
| EXPORT_SYMBOL_GPL(nvme_uninit_ctrl); |
| |
| static void nvme_free_ctrl(struct kref *kref) |
| { |
| struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref); |
| |
| put_device(ctrl->device); |
| nvme_release_instance(ctrl); |
| ida_destroy(&ctrl->ns_ida); |
| |
| ctrl->ops->free_ctrl(ctrl); |
| } |
| |
| void nvme_put_ctrl(struct nvme_ctrl *ctrl) |
| { |
| kref_put(&ctrl->kref, nvme_free_ctrl); |
| } |
| EXPORT_SYMBOL_GPL(nvme_put_ctrl); |
| |
| /* |
| * 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); |
| INIT_LIST_HEAD(&ctrl->namespaces); |
| mutex_init(&ctrl->namespaces_mutex); |
| kref_init(&ctrl->kref); |
| 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); |
| |
| ret = nvme_set_instance(ctrl); |
| if (ret) |
| goto out; |
| |
| ctrl->device = device_create_with_groups(nvme_class, ctrl->dev, |
| MKDEV(nvme_char_major, ctrl->instance), |
| ctrl, nvme_dev_attr_groups, |
| "nvme%d", ctrl->instance); |
| if (IS_ERR(ctrl->device)) { |
| ret = PTR_ERR(ctrl->device); |
| goto out_release_instance; |
| } |
| get_device(ctrl->device); |
| ida_init(&ctrl->ns_ida); |
| |
| spin_lock(&dev_list_lock); |
| list_add_tail(&ctrl->node, &nvme_ctrl_list); |
| spin_unlock(&dev_list_lock); |
| |
| return 0; |
| out_release_instance: |
| nvme_release_instance(ctrl); |
| out: |
| 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; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(ns, &ctrl->namespaces, list) { |
| if (!kref_get_unless_zero(&ns->kref)) |
| continue; |
| |
| /* |
| * Revalidating a dead namespace sets capacity to 0. This will |
| * end buffered writers dirtying pages that can't be synced. |
| */ |
| if (!test_and_set_bit(NVME_NS_DEAD, &ns->flags)) |
| revalidate_disk(ns->disk); |
| |
| blk_set_queue_dying(ns->queue); |
| blk_mq_abort_requeue_list(ns->queue); |
| blk_mq_start_stopped_hw_queues(ns->queue, true); |
| |
| nvme_put_ns(ns); |
| } |
| rcu_read_unlock(); |
| } |
| EXPORT_SYMBOL_GPL(nvme_kill_queues); |
| |
| void nvme_stop_queues(struct nvme_ctrl *ctrl) |
| { |
| struct nvme_ns *ns; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(ns, &ctrl->namespaces, list) { |
| spin_lock_irq(ns->queue->queue_lock); |
| queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue); |
| spin_unlock_irq(ns->queue->queue_lock); |
| |
| blk_mq_cancel_requeue_work(ns->queue); |
| blk_mq_stop_hw_queues(ns->queue); |
| } |
| rcu_read_unlock(); |
| } |
| EXPORT_SYMBOL_GPL(nvme_stop_queues); |
| |
| void nvme_start_queues(struct nvme_ctrl *ctrl) |
| { |
| struct nvme_ns *ns; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(ns, &ctrl->namespaces, list) { |
| queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue); |
| blk_mq_start_stopped_hw_queues(ns->queue, true); |
| blk_mq_kick_requeue_list(ns->queue); |
| } |
| rcu_read_unlock(); |
| } |
| EXPORT_SYMBOL_GPL(nvme_start_queues); |
| |
| int __init nvme_core_init(void) |
| { |
| int result; |
| |
| result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme", |
| &nvme_dev_fops); |
| if (result < 0) |
| return result; |
| else if (result > 0) |
| nvme_char_major = result; |
| |
| nvme_class = class_create(THIS_MODULE, "nvme"); |
| if (IS_ERR(nvme_class)) { |
| result = PTR_ERR(nvme_class); |
| goto unregister_chrdev; |
| } |
| |
| return 0; |
| |
| unregister_chrdev: |
| __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme"); |
| return result; |
| } |
| |
| void nvme_core_exit(void) |
| { |
| class_destroy(nvme_class); |
| __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme"); |
| } |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_VERSION("1.0"); |
| module_init(nvme_core_init); |
| module_exit(nvme_core_exit); |