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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Common code for the NVMe target.
- * Copyright (c) 2015-2016 HGST, a Western Digital Company.
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/module.h>
- #include <linux/random.h>
- #include <linux/rculist.h>
- #include <linux/pci-p2pdma.h>
- #include <linux/scatterlist.h>
- #define CREATE_TRACE_POINTS
- #include "trace.h"
- #include "nvmet.h"
- struct workqueue_struct *buffered_io_wq;
- static const struct nvmet_fabrics_ops *nvmet_transports[NVMF_TRTYPE_MAX];
- static DEFINE_IDA(cntlid_ida);
- /*
- * This read/write semaphore is used to synchronize access to configuration
- * information on a target system that will result in discovery log page
- * information change for at least one host.
- * The full list of resources to protected by this semaphore is:
- *
- * - subsystems list
- * - per-subsystem allowed hosts list
- * - allow_any_host subsystem attribute
- * - nvmet_genctr
- * - the nvmet_transports array
- *
- * When updating any of those lists/structures write lock should be obtained,
- * while when reading (popolating discovery log page or checking host-subsystem
- * link) read lock is obtained to allow concurrent reads.
- */
- DECLARE_RWSEM(nvmet_config_sem);
- u32 nvmet_ana_group_enabled[NVMET_MAX_ANAGRPS + 1];
- u64 nvmet_ana_chgcnt;
- DECLARE_RWSEM(nvmet_ana_sem);
- inline u16 errno_to_nvme_status(struct nvmet_req *req, int errno)
- {
- u16 status;
- switch (errno) {
- case 0:
- status = NVME_SC_SUCCESS;
- break;
- case -ENOSPC:
- req->error_loc = offsetof(struct nvme_rw_command, length);
- status = NVME_SC_CAP_EXCEEDED | NVME_SC_DNR;
- break;
- case -EREMOTEIO:
- req->error_loc = offsetof(struct nvme_rw_command, slba);
- status = NVME_SC_LBA_RANGE | NVME_SC_DNR;
- break;
- case -EOPNOTSUPP:
- req->error_loc = offsetof(struct nvme_common_command, opcode);
- switch (req->cmd->common.opcode) {
- case nvme_cmd_dsm:
- case nvme_cmd_write_zeroes:
- status = NVME_SC_ONCS_NOT_SUPPORTED | NVME_SC_DNR;
- break;
- default:
- status = NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
- }
- break;
- case -ENODATA:
- req->error_loc = offsetof(struct nvme_rw_command, nsid);
- status = NVME_SC_ACCESS_DENIED;
- break;
- case -EIO:
- fallthrough;
- default:
- req->error_loc = offsetof(struct nvme_common_command, opcode);
- status = NVME_SC_INTERNAL | NVME_SC_DNR;
- }
- return status;
- }
- static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port,
- const char *subsysnqn);
- u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf,
- size_t len)
- {
- if (sg_pcopy_from_buffer(req->sg, req->sg_cnt, buf, len, off) != len) {
- req->error_loc = offsetof(struct nvme_common_command, dptr);
- return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR;
- }
- return 0;
- }
- u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, size_t len)
- {
- if (sg_pcopy_to_buffer(req->sg, req->sg_cnt, buf, len, off) != len) {
- req->error_loc = offsetof(struct nvme_common_command, dptr);
- return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR;
- }
- return 0;
- }
- u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len)
- {
- if (sg_zero_buffer(req->sg, req->sg_cnt, len, off) != len) {
- req->error_loc = offsetof(struct nvme_common_command, dptr);
- return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR;
- }
- return 0;
- }
- static unsigned int nvmet_max_nsid(struct nvmet_subsys *subsys)
- {
- unsigned long nsid = 0;
- struct nvmet_ns *cur;
- unsigned long idx;
- xa_for_each(&subsys->namespaces, idx, cur)
- nsid = cur->nsid;
- return nsid;
- }
- static u32 nvmet_async_event_result(struct nvmet_async_event *aen)
- {
- return aen->event_type | (aen->event_info << 8) | (aen->log_page << 16);
- }
- static void nvmet_async_events_failall(struct nvmet_ctrl *ctrl)
- {
- u16 status = NVME_SC_INTERNAL | NVME_SC_DNR;
- struct nvmet_req *req;
- mutex_lock(&ctrl->lock);
- while (ctrl->nr_async_event_cmds) {
- req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds];
- mutex_unlock(&ctrl->lock);
- nvmet_req_complete(req, status);
- mutex_lock(&ctrl->lock);
- }
- mutex_unlock(&ctrl->lock);
- }
- static void nvmet_async_events_process(struct nvmet_ctrl *ctrl)
- {
- struct nvmet_async_event *aen;
- struct nvmet_req *req;
- mutex_lock(&ctrl->lock);
- while (ctrl->nr_async_event_cmds && !list_empty(&ctrl->async_events)) {
- aen = list_first_entry(&ctrl->async_events,
- struct nvmet_async_event, entry);
- req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds];
- nvmet_set_result(req, nvmet_async_event_result(aen));
- list_del(&aen->entry);
- kfree(aen);
- mutex_unlock(&ctrl->lock);
- trace_nvmet_async_event(ctrl, req->cqe->result.u32);
- nvmet_req_complete(req, 0);
- mutex_lock(&ctrl->lock);
- }
- mutex_unlock(&ctrl->lock);
- }
- static void nvmet_async_events_free(struct nvmet_ctrl *ctrl)
- {
- struct nvmet_async_event *aen, *tmp;
- mutex_lock(&ctrl->lock);
- list_for_each_entry_safe(aen, tmp, &ctrl->async_events, entry) {
- list_del(&aen->entry);
- kfree(aen);
- }
- mutex_unlock(&ctrl->lock);
- }
- static void nvmet_async_event_work(struct work_struct *work)
- {
- struct nvmet_ctrl *ctrl =
- container_of(work, struct nvmet_ctrl, async_event_work);
- nvmet_async_events_process(ctrl);
- }
- void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
- u8 event_info, u8 log_page)
- {
- struct nvmet_async_event *aen;
- aen = kmalloc(sizeof(*aen), GFP_KERNEL);
- if (!aen)
- return;
- aen->event_type = event_type;
- aen->event_info = event_info;
- aen->log_page = log_page;
- mutex_lock(&ctrl->lock);
- list_add_tail(&aen->entry, &ctrl->async_events);
- mutex_unlock(&ctrl->lock);
- schedule_work(&ctrl->async_event_work);
- }
- static void nvmet_add_to_changed_ns_log(struct nvmet_ctrl *ctrl, __le32 nsid)
- {
- u32 i;
- mutex_lock(&ctrl->lock);
- if (ctrl->nr_changed_ns > NVME_MAX_CHANGED_NAMESPACES)
- goto out_unlock;
- for (i = 0; i < ctrl->nr_changed_ns; i++) {
- if (ctrl->changed_ns_list[i] == nsid)
- goto out_unlock;
- }
- if (ctrl->nr_changed_ns == NVME_MAX_CHANGED_NAMESPACES) {
- ctrl->changed_ns_list[0] = cpu_to_le32(0xffffffff);
- ctrl->nr_changed_ns = U32_MAX;
- goto out_unlock;
- }
- ctrl->changed_ns_list[ctrl->nr_changed_ns++] = nsid;
- out_unlock:
- mutex_unlock(&ctrl->lock);
- }
- void nvmet_ns_changed(struct nvmet_subsys *subsys, u32 nsid)
- {
- struct nvmet_ctrl *ctrl;
- lockdep_assert_held(&subsys->lock);
- list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
- nvmet_add_to_changed_ns_log(ctrl, cpu_to_le32(nsid));
- if (nvmet_aen_bit_disabled(ctrl, NVME_AEN_BIT_NS_ATTR))
- continue;
- nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE,
- NVME_AER_NOTICE_NS_CHANGED,
- NVME_LOG_CHANGED_NS);
- }
- }
- void nvmet_send_ana_event(struct nvmet_subsys *subsys,
- struct nvmet_port *port)
- {
- struct nvmet_ctrl *ctrl;
- mutex_lock(&subsys->lock);
- list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
- if (port && ctrl->port != port)
- continue;
- if (nvmet_aen_bit_disabled(ctrl, NVME_AEN_BIT_ANA_CHANGE))
- continue;
- nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE,
- NVME_AER_NOTICE_ANA, NVME_LOG_ANA);
- }
- mutex_unlock(&subsys->lock);
- }
- void nvmet_port_send_ana_event(struct nvmet_port *port)
- {
- struct nvmet_subsys_link *p;
- down_read(&nvmet_config_sem);
- list_for_each_entry(p, &port->subsystems, entry)
- nvmet_send_ana_event(p->subsys, port);
- up_read(&nvmet_config_sem);
- }
- int nvmet_register_transport(const struct nvmet_fabrics_ops *ops)
- {
- int ret = 0;
- down_write(&nvmet_config_sem);
- if (nvmet_transports[ops->type])
- ret = -EINVAL;
- else
- nvmet_transports[ops->type] = ops;
- up_write(&nvmet_config_sem);
- return ret;
- }
- EXPORT_SYMBOL_GPL(nvmet_register_transport);
- void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops)
- {
- down_write(&nvmet_config_sem);
- nvmet_transports[ops->type] = NULL;
- up_write(&nvmet_config_sem);
- }
- EXPORT_SYMBOL_GPL(nvmet_unregister_transport);
- void nvmet_port_del_ctrls(struct nvmet_port *port, struct nvmet_subsys *subsys)
- {
- struct nvmet_ctrl *ctrl;
- mutex_lock(&subsys->lock);
- list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
- if (ctrl->port == port)
- ctrl->ops->delete_ctrl(ctrl);
- }
- mutex_unlock(&subsys->lock);
- }
- int nvmet_enable_port(struct nvmet_port *port)
- {
- const struct nvmet_fabrics_ops *ops;
- int ret;
- lockdep_assert_held(&nvmet_config_sem);
- ops = nvmet_transports[port->disc_addr.trtype];
- if (!ops) {
- up_write(&nvmet_config_sem);
- request_module("nvmet-transport-%d", port->disc_addr.trtype);
- down_write(&nvmet_config_sem);
- ops = nvmet_transports[port->disc_addr.trtype];
- if (!ops) {
- pr_err("transport type %d not supported\n",
- port->disc_addr.trtype);
- return -EINVAL;
- }
- }
- if (!try_module_get(ops->owner))
- return -EINVAL;
- /*
- * If the user requested PI support and the transport isn't pi capable,
- * don't enable the port.
- */
- if (port->pi_enable && !(ops->flags & NVMF_METADATA_SUPPORTED)) {
- pr_err("T10-PI is not supported by transport type %d\n",
- port->disc_addr.trtype);
- ret = -EINVAL;
- goto out_put;
- }
- ret = ops->add_port(port);
- if (ret)
- goto out_put;
- /* If the transport didn't set inline_data_size, then disable it. */
- if (port->inline_data_size < 0)
- port->inline_data_size = 0;
- port->enabled = true;
- port->tr_ops = ops;
- return 0;
- out_put:
- module_put(ops->owner);
- return ret;
- }
- void nvmet_disable_port(struct nvmet_port *port)
- {
- const struct nvmet_fabrics_ops *ops;
- lockdep_assert_held(&nvmet_config_sem);
- port->enabled = false;
- port->tr_ops = NULL;
- ops = nvmet_transports[port->disc_addr.trtype];
- ops->remove_port(port);
- module_put(ops->owner);
- }
- static void nvmet_keep_alive_timer(struct work_struct *work)
- {
- struct nvmet_ctrl *ctrl = container_of(to_delayed_work(work),
- struct nvmet_ctrl, ka_work);
- bool reset_tbkas = ctrl->reset_tbkas;
- ctrl->reset_tbkas = false;
- if (reset_tbkas) {
- pr_debug("ctrl %d reschedule traffic based keep-alive timer\n",
- ctrl->cntlid);
- schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
- return;
- }
- pr_err("ctrl %d keep-alive timer (%d seconds) expired!\n",
- ctrl->cntlid, ctrl->kato);
- nvmet_ctrl_fatal_error(ctrl);
- }
- void nvmet_start_keep_alive_timer(struct nvmet_ctrl *ctrl)
- {
- if (unlikely(ctrl->kato == 0))
- return;
- pr_debug("ctrl %d start keep-alive timer for %d secs\n",
- ctrl->cntlid, ctrl->kato);
- INIT_DELAYED_WORK(&ctrl->ka_work, nvmet_keep_alive_timer);
- schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
- }
- void nvmet_stop_keep_alive_timer(struct nvmet_ctrl *ctrl)
- {
- if (unlikely(ctrl->kato == 0))
- return;
- pr_debug("ctrl %d stop keep-alive\n", ctrl->cntlid);
- cancel_delayed_work_sync(&ctrl->ka_work);
- }
- struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid)
- {
- struct nvmet_ns *ns;
- ns = xa_load(&ctrl->subsys->namespaces, le32_to_cpu(nsid));
- if (ns)
- percpu_ref_get(&ns->ref);
- return ns;
- }
- static void nvmet_destroy_namespace(struct percpu_ref *ref)
- {
- struct nvmet_ns *ns = container_of(ref, struct nvmet_ns, ref);
- complete(&ns->disable_done);
- }
- void nvmet_put_namespace(struct nvmet_ns *ns)
- {
- percpu_ref_put(&ns->ref);
- }
- static void nvmet_ns_dev_disable(struct nvmet_ns *ns)
- {
- nvmet_bdev_ns_disable(ns);
- nvmet_file_ns_disable(ns);
- }
- static int nvmet_p2pmem_ns_enable(struct nvmet_ns *ns)
- {
- int ret;
- struct pci_dev *p2p_dev;
- if (!ns->use_p2pmem)
- return 0;
- if (!ns->bdev) {
- pr_err("peer-to-peer DMA is not supported by non-block device namespaces\n");
- return -EINVAL;
- }
- if (!blk_queue_pci_p2pdma(ns->bdev->bd_disk->queue)) {
- pr_err("peer-to-peer DMA is not supported by the driver of %s\n",
- ns->device_path);
- return -EINVAL;
- }
- if (ns->p2p_dev) {
- ret = pci_p2pdma_distance(ns->p2p_dev, nvmet_ns_dev(ns), true);
- if (ret < 0)
- return -EINVAL;
- } else {
- /*
- * Right now we just check that there is p2pmem available so
- * we can report an error to the user right away if there
- * is not. We'll find the actual device to use once we
- * setup the controller when the port's device is available.
- */
- p2p_dev = pci_p2pmem_find(nvmet_ns_dev(ns));
- if (!p2p_dev) {
- pr_err("no peer-to-peer memory is available for %s\n",
- ns->device_path);
- return -EINVAL;
- }
- pci_dev_put(p2p_dev);
- }
- return 0;
- }
- /*
- * Note: ctrl->subsys->lock should be held when calling this function
- */
- static void nvmet_p2pmem_ns_add_p2p(struct nvmet_ctrl *ctrl,
- struct nvmet_ns *ns)
- {
- struct device *clients[2];
- struct pci_dev *p2p_dev;
- int ret;
- if (!ctrl->p2p_client || !ns->use_p2pmem)
- return;
- if (ns->p2p_dev) {
- ret = pci_p2pdma_distance(ns->p2p_dev, ctrl->p2p_client, true);
- if (ret < 0)
- return;
- p2p_dev = pci_dev_get(ns->p2p_dev);
- } else {
- clients[0] = ctrl->p2p_client;
- clients[1] = nvmet_ns_dev(ns);
- p2p_dev = pci_p2pmem_find_many(clients, ARRAY_SIZE(clients));
- if (!p2p_dev) {
- pr_err("no peer-to-peer memory is available that's supported by %s and %s\n",
- dev_name(ctrl->p2p_client), ns->device_path);
- return;
- }
- }
- ret = radix_tree_insert(&ctrl->p2p_ns_map, ns->nsid, p2p_dev);
- if (ret < 0)
- pci_dev_put(p2p_dev);
- pr_info("using p2pmem on %s for nsid %d\n", pci_name(p2p_dev),
- ns->nsid);
- }
- void nvmet_ns_revalidate(struct nvmet_ns *ns)
- {
- loff_t oldsize = ns->size;
- if (ns->bdev)
- nvmet_bdev_ns_revalidate(ns);
- else
- nvmet_file_ns_revalidate(ns);
- if (oldsize != ns->size)
- nvmet_ns_changed(ns->subsys, ns->nsid);
- }
- int nvmet_ns_enable(struct nvmet_ns *ns)
- {
- struct nvmet_subsys *subsys = ns->subsys;
- struct nvmet_ctrl *ctrl;
- int ret;
- mutex_lock(&subsys->lock);
- ret = 0;
- if (nvmet_passthru_ctrl(subsys)) {
- pr_info("cannot enable both passthru and regular namespaces for a single subsystem");
- goto out_unlock;
- }
- if (ns->enabled)
- goto out_unlock;
- ret = -EMFILE;
- if (subsys->nr_namespaces == NVMET_MAX_NAMESPACES)
- goto out_unlock;
- ret = nvmet_bdev_ns_enable(ns);
- if (ret == -ENOTBLK)
- ret = nvmet_file_ns_enable(ns);
- if (ret)
- goto out_unlock;
- ret = nvmet_p2pmem_ns_enable(ns);
- if (ret)
- goto out_dev_disable;
- list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry)
- nvmet_p2pmem_ns_add_p2p(ctrl, ns);
- ret = percpu_ref_init(&ns->ref, nvmet_destroy_namespace,
- 0, GFP_KERNEL);
- if (ret)
- goto out_dev_put;
- if (ns->nsid > subsys->max_nsid)
- subsys->max_nsid = ns->nsid;
- ret = xa_insert(&subsys->namespaces, ns->nsid, ns, GFP_KERNEL);
- if (ret)
- goto out_restore_subsys_maxnsid;
- subsys->nr_namespaces++;
- nvmet_ns_changed(subsys, ns->nsid);
- ns->enabled = true;
- ret = 0;
- out_unlock:
- mutex_unlock(&subsys->lock);
- return ret;
- out_restore_subsys_maxnsid:
- subsys->max_nsid = nvmet_max_nsid(subsys);
- percpu_ref_exit(&ns->ref);
- out_dev_put:
- list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry)
- pci_dev_put(radix_tree_delete(&ctrl->p2p_ns_map, ns->nsid));
- out_dev_disable:
- nvmet_ns_dev_disable(ns);
- goto out_unlock;
- }
- void nvmet_ns_disable(struct nvmet_ns *ns)
- {
- struct nvmet_subsys *subsys = ns->subsys;
- struct nvmet_ctrl *ctrl;
- mutex_lock(&subsys->lock);
- if (!ns->enabled)
- goto out_unlock;
- ns->enabled = false;
- xa_erase(&ns->subsys->namespaces, ns->nsid);
- if (ns->nsid == subsys->max_nsid)
- subsys->max_nsid = nvmet_max_nsid(subsys);
- list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry)
- pci_dev_put(radix_tree_delete(&ctrl->p2p_ns_map, ns->nsid));
- mutex_unlock(&subsys->lock);
- /*
- * Now that we removed the namespaces from the lookup list, we
- * can kill the per_cpu ref and wait for any remaining references
- * to be dropped, as well as a RCU grace period for anyone only
- * using the namepace under rcu_read_lock(). Note that we can't
- * use call_rcu here as we need to ensure the namespaces have
- * been fully destroyed before unloading the module.
- */
- percpu_ref_kill(&ns->ref);
- synchronize_rcu();
- wait_for_completion(&ns->disable_done);
- percpu_ref_exit(&ns->ref);
- mutex_lock(&subsys->lock);
- subsys->nr_namespaces--;
- nvmet_ns_changed(subsys, ns->nsid);
- nvmet_ns_dev_disable(ns);
- out_unlock:
- mutex_unlock(&subsys->lock);
- }
- void nvmet_ns_free(struct nvmet_ns *ns)
- {
- nvmet_ns_disable(ns);
- down_write(&nvmet_ana_sem);
- nvmet_ana_group_enabled[ns->anagrpid]--;
- up_write(&nvmet_ana_sem);
- kfree(ns->device_path);
- kfree(ns);
- }
- struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid)
- {
- struct nvmet_ns *ns;
- ns = kzalloc(sizeof(*ns), GFP_KERNEL);
- if (!ns)
- return NULL;
- init_completion(&ns->disable_done);
- ns->nsid = nsid;
- ns->subsys = subsys;
- down_write(&nvmet_ana_sem);
- ns->anagrpid = NVMET_DEFAULT_ANA_GRPID;
- nvmet_ana_group_enabled[ns->anagrpid]++;
- up_write(&nvmet_ana_sem);
- uuid_gen(&ns->uuid);
- ns->buffered_io = false;
- return ns;
- }
- static void nvmet_update_sq_head(struct nvmet_req *req)
- {
- if (req->sq->size) {
- u32 old_sqhd, new_sqhd;
- do {
- old_sqhd = req->sq->sqhd;
- new_sqhd = (old_sqhd + 1) % req->sq->size;
- } while (cmpxchg(&req->sq->sqhd, old_sqhd, new_sqhd) !=
- old_sqhd);
- }
- req->cqe->sq_head = cpu_to_le16(req->sq->sqhd & 0x0000FFFF);
- }
- static void nvmet_set_error(struct nvmet_req *req, u16 status)
- {
- struct nvmet_ctrl *ctrl = req->sq->ctrl;
- struct nvme_error_slot *new_error_slot;
- unsigned long flags;
- req->cqe->status = cpu_to_le16(status << 1);
- if (!ctrl || req->error_loc == NVMET_NO_ERROR_LOC)
- return;
- spin_lock_irqsave(&ctrl->error_lock, flags);
- ctrl->err_counter++;
- new_error_slot =
- &ctrl->slots[ctrl->err_counter % NVMET_ERROR_LOG_SLOTS];
- new_error_slot->error_count = cpu_to_le64(ctrl->err_counter);
- new_error_slot->sqid = cpu_to_le16(req->sq->qid);
- new_error_slot->cmdid = cpu_to_le16(req->cmd->common.command_id);
- new_error_slot->status_field = cpu_to_le16(status << 1);
- new_error_slot->param_error_location = cpu_to_le16(req->error_loc);
- new_error_slot->lba = cpu_to_le64(req->error_slba);
- new_error_slot->nsid = req->cmd->common.nsid;
- spin_unlock_irqrestore(&ctrl->error_lock, flags);
- /* set the more bit for this request */
- req->cqe->status |= cpu_to_le16(1 << 14);
- }
- static void __nvmet_req_complete(struct nvmet_req *req, u16 status)
- {
- if (!req->sq->sqhd_disabled)
- nvmet_update_sq_head(req);
- req->cqe->sq_id = cpu_to_le16(req->sq->qid);
- req->cqe->command_id = req->cmd->common.command_id;
- if (unlikely(status))
- nvmet_set_error(req, status);
- trace_nvmet_req_complete(req);
- if (req->ns)
- nvmet_put_namespace(req->ns);
- req->ops->queue_response(req);
- }
- void nvmet_req_complete(struct nvmet_req *req, u16 status)
- {
- __nvmet_req_complete(req, status);
- percpu_ref_put(&req->sq->ref);
- }
- EXPORT_SYMBOL_GPL(nvmet_req_complete);
- void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq,
- u16 qid, u16 size)
- {
- cq->qid = qid;
- cq->size = size;
- }
- void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq,
- u16 qid, u16 size)
- {
- sq->sqhd = 0;
- sq->qid = qid;
- sq->size = size;
- ctrl->sqs[qid] = sq;
- }
- static void nvmet_confirm_sq(struct percpu_ref *ref)
- {
- struct nvmet_sq *sq = container_of(ref, struct nvmet_sq, ref);
- complete(&sq->confirm_done);
- }
- void nvmet_sq_destroy(struct nvmet_sq *sq)
- {
- struct nvmet_ctrl *ctrl = sq->ctrl;
- /*
- * If this is the admin queue, complete all AERs so that our
- * queue doesn't have outstanding requests on it.
- */
- if (ctrl && ctrl->sqs && ctrl->sqs[0] == sq)
- nvmet_async_events_failall(ctrl);
- percpu_ref_kill_and_confirm(&sq->ref, nvmet_confirm_sq);
- wait_for_completion(&sq->confirm_done);
- wait_for_completion(&sq->free_done);
- percpu_ref_exit(&sq->ref);
- if (ctrl) {
- /*
- * The teardown flow may take some time, and the host may not
- * send us keep-alive during this period, hence reset the
- * traffic based keep-alive timer so we don't trigger a
- * controller teardown as a result of a keep-alive expiration.
- */
- ctrl->reset_tbkas = true;
- nvmet_ctrl_put(ctrl);
- sq->ctrl = NULL; /* allows reusing the queue later */
- }
- }
- EXPORT_SYMBOL_GPL(nvmet_sq_destroy);
- static void nvmet_sq_free(struct percpu_ref *ref)
- {
- struct nvmet_sq *sq = container_of(ref, struct nvmet_sq, ref);
- complete(&sq->free_done);
- }
- int nvmet_sq_init(struct nvmet_sq *sq)
- {
- int ret;
- ret = percpu_ref_init(&sq->ref, nvmet_sq_free, 0, GFP_KERNEL);
- if (ret) {
- pr_err("percpu_ref init failed!\n");
- return ret;
- }
- init_completion(&sq->free_done);
- init_completion(&sq->confirm_done);
- return 0;
- }
- EXPORT_SYMBOL_GPL(nvmet_sq_init);
- static inline u16 nvmet_check_ana_state(struct nvmet_port *port,
- struct nvmet_ns *ns)
- {
- enum nvme_ana_state state = port->ana_state[ns->anagrpid];
- if (unlikely(state == NVME_ANA_INACCESSIBLE))
- return NVME_SC_ANA_INACCESSIBLE;
- if (unlikely(state == NVME_ANA_PERSISTENT_LOSS))
- return NVME_SC_ANA_PERSISTENT_LOSS;
- if (unlikely(state == NVME_ANA_CHANGE))
- return NVME_SC_ANA_TRANSITION;
- return 0;
- }
- static inline u16 nvmet_io_cmd_check_access(struct nvmet_req *req)
- {
- if (unlikely(req->ns->readonly)) {
- switch (req->cmd->common.opcode) {
- case nvme_cmd_read:
- case nvme_cmd_flush:
- break;
- default:
- return NVME_SC_NS_WRITE_PROTECTED;
- }
- }
- return 0;
- }
- static u16 nvmet_parse_io_cmd(struct nvmet_req *req)
- {
- struct nvme_command *cmd = req->cmd;
- u16 ret;
- ret = nvmet_check_ctrl_status(req, cmd);
- if (unlikely(ret))
- return ret;
- if (nvmet_req_passthru_ctrl(req))
- return nvmet_parse_passthru_io_cmd(req);
- req->ns = nvmet_find_namespace(req->sq->ctrl, cmd->rw.nsid);
- if (unlikely(!req->ns)) {
- req->error_loc = offsetof(struct nvme_common_command, nsid);
- return NVME_SC_INVALID_NS | NVME_SC_DNR;
- }
- ret = nvmet_check_ana_state(req->port, req->ns);
- if (unlikely(ret)) {
- req->error_loc = offsetof(struct nvme_common_command, nsid);
- return ret;
- }
- ret = nvmet_io_cmd_check_access(req);
- if (unlikely(ret)) {
- req->error_loc = offsetof(struct nvme_common_command, nsid);
- return ret;
- }
- if (req->ns->file)
- return nvmet_file_parse_io_cmd(req);
- else
- return nvmet_bdev_parse_io_cmd(req);
- }
- bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
- struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops)
- {
- u8 flags = req->cmd->common.flags;
- u16 status;
- req->cq = cq;
- req->sq = sq;
- req->ops = ops;
- req->sg = NULL;
- req->metadata_sg = NULL;
- req->sg_cnt = 0;
- req->metadata_sg_cnt = 0;
- req->transfer_len = 0;
- req->metadata_len = 0;
- req->cqe->status = 0;
- req->cqe->sq_head = 0;
- req->ns = NULL;
- req->error_loc = NVMET_NO_ERROR_LOC;
- req->error_slba = 0;
- /* no support for fused commands yet */
- if (unlikely(flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND))) {
- req->error_loc = offsetof(struct nvme_common_command, flags);
- status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
- goto fail;
- }
- /*
- * For fabrics, PSDT field shall describe metadata pointer (MPTR) that
- * contains an address of a single contiguous physical buffer that is
- * byte aligned.
- */
- if (unlikely((flags & NVME_CMD_SGL_ALL) != NVME_CMD_SGL_METABUF)) {
- req->error_loc = offsetof(struct nvme_common_command, flags);
- status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
- goto fail;
- }
- if (unlikely(!req->sq->ctrl))
- /* will return an error for any non-connect command: */
- status = nvmet_parse_connect_cmd(req);
- else if (likely(req->sq->qid != 0))
- status = nvmet_parse_io_cmd(req);
- else
- status = nvmet_parse_admin_cmd(req);
- if (status)
- goto fail;
- trace_nvmet_req_init(req, req->cmd);
- if (unlikely(!percpu_ref_tryget_live(&sq->ref))) {
- status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
- goto fail;
- }
- if (sq->ctrl)
- sq->ctrl->reset_tbkas = true;
- return true;
- fail:
- __nvmet_req_complete(req, status);
- return false;
- }
- EXPORT_SYMBOL_GPL(nvmet_req_init);
- void nvmet_req_uninit(struct nvmet_req *req)
- {
- percpu_ref_put(&req->sq->ref);
- if (req->ns)
- nvmet_put_namespace(req->ns);
- }
- EXPORT_SYMBOL_GPL(nvmet_req_uninit);
- bool nvmet_check_transfer_len(struct nvmet_req *req, size_t len)
- {
- if (unlikely(len != req->transfer_len)) {
- req->error_loc = offsetof(struct nvme_common_command, dptr);
- nvmet_req_complete(req, NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR);
- return false;
- }
- return true;
- }
- EXPORT_SYMBOL_GPL(nvmet_check_transfer_len);
- bool nvmet_check_data_len_lte(struct nvmet_req *req, size_t data_len)
- {
- if (unlikely(data_len > req->transfer_len)) {
- req->error_loc = offsetof(struct nvme_common_command, dptr);
- nvmet_req_complete(req, NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR);
- return false;
- }
- return true;
- }
- static unsigned int nvmet_data_transfer_len(struct nvmet_req *req)
- {
- return req->transfer_len - req->metadata_len;
- }
- static int nvmet_req_alloc_p2pmem_sgls(struct pci_dev *p2p_dev,
- struct nvmet_req *req)
- {
- req->sg = pci_p2pmem_alloc_sgl(p2p_dev, &req->sg_cnt,
- nvmet_data_transfer_len(req));
- if (!req->sg)
- goto out_err;
- if (req->metadata_len) {
- req->metadata_sg = pci_p2pmem_alloc_sgl(p2p_dev,
- &req->metadata_sg_cnt, req->metadata_len);
- if (!req->metadata_sg)
- goto out_free_sg;
- }
- req->p2p_dev = p2p_dev;
- return 0;
- out_free_sg:
- pci_p2pmem_free_sgl(req->p2p_dev, req->sg);
- out_err:
- return -ENOMEM;
- }
- static struct pci_dev *nvmet_req_find_p2p_dev(struct nvmet_req *req)
- {
- if (!IS_ENABLED(CONFIG_PCI_P2PDMA) ||
- !req->sq->ctrl || !req->sq->qid || !req->ns)
- return NULL;
- return radix_tree_lookup(&req->sq->ctrl->p2p_ns_map, req->ns->nsid);
- }
- int nvmet_req_alloc_sgls(struct nvmet_req *req)
- {
- struct pci_dev *p2p_dev = nvmet_req_find_p2p_dev(req);
- if (p2p_dev && !nvmet_req_alloc_p2pmem_sgls(p2p_dev, req))
- return 0;
- req->sg = sgl_alloc(nvmet_data_transfer_len(req), GFP_KERNEL,
- &req->sg_cnt);
- if (unlikely(!req->sg))
- goto out;
- if (req->metadata_len) {
- req->metadata_sg = sgl_alloc(req->metadata_len, GFP_KERNEL,
- &req->metadata_sg_cnt);
- if (unlikely(!req->metadata_sg))
- goto out_free;
- }
- return 0;
- out_free:
- sgl_free(req->sg);
- out:
- return -ENOMEM;
- }
- EXPORT_SYMBOL_GPL(nvmet_req_alloc_sgls);
- void nvmet_req_free_sgls(struct nvmet_req *req)
- {
- if (req->p2p_dev) {
- pci_p2pmem_free_sgl(req->p2p_dev, req->sg);
- if (req->metadata_sg)
- pci_p2pmem_free_sgl(req->p2p_dev, req->metadata_sg);
- req->p2p_dev = NULL;
- } else {
- sgl_free(req->sg);
- if (req->metadata_sg)
- sgl_free(req->metadata_sg);
- }
- req->sg = NULL;
- req->metadata_sg = NULL;
- req->sg_cnt = 0;
- req->metadata_sg_cnt = 0;
- }
- EXPORT_SYMBOL_GPL(nvmet_req_free_sgls);
- static inline bool nvmet_cc_en(u32 cc)
- {
- return (cc >> NVME_CC_EN_SHIFT) & 0x1;
- }
- static inline u8 nvmet_cc_css(u32 cc)
- {
- return (cc >> NVME_CC_CSS_SHIFT) & 0x7;
- }
- static inline u8 nvmet_cc_mps(u32 cc)
- {
- return (cc >> NVME_CC_MPS_SHIFT) & 0xf;
- }
- static inline u8 nvmet_cc_ams(u32 cc)
- {
- return (cc >> NVME_CC_AMS_SHIFT) & 0x7;
- }
- static inline u8 nvmet_cc_shn(u32 cc)
- {
- return (cc >> NVME_CC_SHN_SHIFT) & 0x3;
- }
- static inline u8 nvmet_cc_iosqes(u32 cc)
- {
- return (cc >> NVME_CC_IOSQES_SHIFT) & 0xf;
- }
- static inline u8 nvmet_cc_iocqes(u32 cc)
- {
- return (cc >> NVME_CC_IOCQES_SHIFT) & 0xf;
- }
- static void nvmet_start_ctrl(struct nvmet_ctrl *ctrl)
- {
- lockdep_assert_held(&ctrl->lock);
- /*
- * Only I/O controllers should verify iosqes,iocqes.
- * Strictly speaking, the spec says a discovery controller
- * should verify iosqes,iocqes are zeroed, however that
- * would break backwards compatibility, so don't enforce it.
- */
- if (ctrl->subsys->type != NVME_NQN_DISC &&
- (nvmet_cc_iosqes(ctrl->cc) != NVME_NVM_IOSQES ||
- nvmet_cc_iocqes(ctrl->cc) != NVME_NVM_IOCQES)) {
- ctrl->csts = NVME_CSTS_CFS;
- return;
- }
- if (nvmet_cc_mps(ctrl->cc) != 0 ||
- nvmet_cc_ams(ctrl->cc) != 0 ||
- nvmet_cc_css(ctrl->cc) != 0) {
- ctrl->csts = NVME_CSTS_CFS;
- return;
- }
- ctrl->csts = NVME_CSTS_RDY;
- /*
- * Controllers that are not yet enabled should not really enforce the
- * keep alive timeout, but we still want to track a timeout and cleanup
- * in case a host died before it enabled the controller. Hence, simply
- * reset the keep alive timer when the controller is enabled.
- */
- if (ctrl->kato)
- mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ);
- }
- static void nvmet_clear_ctrl(struct nvmet_ctrl *ctrl)
- {
- lockdep_assert_held(&ctrl->lock);
- /* XXX: tear down queues? */
- ctrl->csts &= ~NVME_CSTS_RDY;
- ctrl->cc = 0;
- }
- void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new)
- {
- u32 old;
- mutex_lock(&ctrl->lock);
- old = ctrl->cc;
- ctrl->cc = new;
- if (nvmet_cc_en(new) && !nvmet_cc_en(old))
- nvmet_start_ctrl(ctrl);
- if (!nvmet_cc_en(new) && nvmet_cc_en(old))
- nvmet_clear_ctrl(ctrl);
- if (nvmet_cc_shn(new) && !nvmet_cc_shn(old)) {
- nvmet_clear_ctrl(ctrl);
- ctrl->csts |= NVME_CSTS_SHST_CMPLT;
- }
- if (!nvmet_cc_shn(new) && nvmet_cc_shn(old))
- ctrl->csts &= ~NVME_CSTS_SHST_CMPLT;
- mutex_unlock(&ctrl->lock);
- }
- static void nvmet_init_cap(struct nvmet_ctrl *ctrl)
- {
- /* command sets supported: NVMe command set: */
- ctrl->cap = (1ULL << 37);
- /* CC.EN timeout in 500msec units: */
- ctrl->cap |= (15ULL << 24);
- /* maximum queue entries supported: */
- ctrl->cap |= NVMET_QUEUE_SIZE - 1;
- }
- u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid,
- struct nvmet_req *req, struct nvmet_ctrl **ret)
- {
- struct nvmet_subsys *subsys;
- struct nvmet_ctrl *ctrl;
- u16 status = 0;
- subsys = nvmet_find_get_subsys(req->port, subsysnqn);
- if (!subsys) {
- pr_warn("connect request for invalid subsystem %s!\n",
- subsysnqn);
- req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(subsysnqn);
- return NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
- }
- mutex_lock(&subsys->lock);
- list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
- if (ctrl->cntlid == cntlid) {
- if (strncmp(hostnqn, ctrl->hostnqn, NVMF_NQN_SIZE)) {
- pr_warn("hostnqn mismatch.\n");
- continue;
- }
- if (!kref_get_unless_zero(&ctrl->ref))
- continue;
- *ret = ctrl;
- goto out;
- }
- }
- pr_warn("could not find controller %d for subsys %s / host %s\n",
- cntlid, subsysnqn, hostnqn);
- req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid);
- status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
- out:
- mutex_unlock(&subsys->lock);
- nvmet_subsys_put(subsys);
- return status;
- }
- u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd)
- {
- if (unlikely(!(req->sq->ctrl->cc & NVME_CC_ENABLE))) {
- pr_err("got cmd %d while CC.EN == 0 on qid = %d\n",
- cmd->common.opcode, req->sq->qid);
- return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
- }
- if (unlikely(!(req->sq->ctrl->csts & NVME_CSTS_RDY))) {
- pr_err("got cmd %d while CSTS.RDY == 0 on qid = %d\n",
- cmd->common.opcode, req->sq->qid);
- return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
- }
- return 0;
- }
- bool nvmet_host_allowed(struct nvmet_subsys *subsys, const char *hostnqn)
- {
- struct nvmet_host_link *p;
- lockdep_assert_held(&nvmet_config_sem);
- if (subsys->allow_any_host)
- return true;
- if (subsys->type == NVME_NQN_DISC) /* allow all access to disc subsys */
- return true;
- list_for_each_entry(p, &subsys->hosts, entry) {
- if (!strcmp(nvmet_host_name(p->host), hostnqn))
- return true;
- }
- return false;
- }
- /*
- * Note: ctrl->subsys->lock should be held when calling this function
- */
- static void nvmet_setup_p2p_ns_map(struct nvmet_ctrl *ctrl,
- struct nvmet_req *req)
- {
- struct nvmet_ns *ns;
- unsigned long idx;
- if (!req->p2p_client)
- return;
- ctrl->p2p_client = get_device(req->p2p_client);
- xa_for_each(&ctrl->subsys->namespaces, idx, ns)
- nvmet_p2pmem_ns_add_p2p(ctrl, ns);
- }
- /*
- * Note: ctrl->subsys->lock should be held when calling this function
- */
- static void nvmet_release_p2p_ns_map(struct nvmet_ctrl *ctrl)
- {
- struct radix_tree_iter iter;
- void __rcu **slot;
- radix_tree_for_each_slot(slot, &ctrl->p2p_ns_map, &iter, 0)
- pci_dev_put(radix_tree_deref_slot(slot));
- put_device(ctrl->p2p_client);
- }
- static void nvmet_fatal_error_handler(struct work_struct *work)
- {
- struct nvmet_ctrl *ctrl =
- container_of(work, struct nvmet_ctrl, fatal_err_work);
- pr_err("ctrl %d fatal error occurred!\n", ctrl->cntlid);
- ctrl->ops->delete_ctrl(ctrl);
- }
- u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
- struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp)
- {
- struct nvmet_subsys *subsys;
- struct nvmet_ctrl *ctrl;
- int ret;
- u16 status;
- status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
- subsys = nvmet_find_get_subsys(req->port, subsysnqn);
- if (!subsys) {
- pr_warn("connect request for invalid subsystem %s!\n",
- subsysnqn);
- req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(subsysnqn);
- goto out;
- }
- status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
- down_read(&nvmet_config_sem);
- if (!nvmet_host_allowed(subsys, hostnqn)) {
- pr_info("connect by host %s for subsystem %s not allowed\n",
- hostnqn, subsysnqn);
- req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(hostnqn);
- up_read(&nvmet_config_sem);
- status = NVME_SC_CONNECT_INVALID_HOST | NVME_SC_DNR;
- goto out_put_subsystem;
- }
- up_read(&nvmet_config_sem);
- status = NVME_SC_INTERNAL;
- ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
- if (!ctrl)
- goto out_put_subsystem;
- mutex_init(&ctrl->lock);
- nvmet_init_cap(ctrl);
- ctrl->port = req->port;
- INIT_WORK(&ctrl->async_event_work, nvmet_async_event_work);
- INIT_LIST_HEAD(&ctrl->async_events);
- INIT_RADIX_TREE(&ctrl->p2p_ns_map, GFP_KERNEL);
- INIT_WORK(&ctrl->fatal_err_work, nvmet_fatal_error_handler);
- memcpy(ctrl->subsysnqn, subsysnqn, NVMF_NQN_SIZE);
- memcpy(ctrl->hostnqn, hostnqn, NVMF_NQN_SIZE);
- kref_init(&ctrl->ref);
- ctrl->subsys = subsys;
- WRITE_ONCE(ctrl->aen_enabled, NVMET_AEN_CFG_OPTIONAL);
- ctrl->changed_ns_list = kmalloc_array(NVME_MAX_CHANGED_NAMESPACES,
- sizeof(__le32), GFP_KERNEL);
- if (!ctrl->changed_ns_list)
- goto out_free_ctrl;
- ctrl->sqs = kcalloc(subsys->max_qid + 1,
- sizeof(struct nvmet_sq *),
- GFP_KERNEL);
- if (!ctrl->sqs)
- goto out_free_changed_ns_list;
- if (subsys->cntlid_min > subsys->cntlid_max)
- goto out_free_sqs;
- ret = ida_simple_get(&cntlid_ida,
- subsys->cntlid_min, subsys->cntlid_max,
- GFP_KERNEL);
- if (ret < 0) {
- status = NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR;
- goto out_free_sqs;
- }
- ctrl->cntlid = ret;
- ctrl->ops = req->ops;
- /*
- * Discovery controllers may use some arbitrary high value
- * in order to cleanup stale discovery sessions
- */
- if ((ctrl->subsys->type == NVME_NQN_DISC) && !kato)
- kato = NVMET_DISC_KATO_MS;
- /* keep-alive timeout in seconds */
- ctrl->kato = DIV_ROUND_UP(kato, 1000);
- ctrl->err_counter = 0;
- spin_lock_init(&ctrl->error_lock);
- nvmet_start_keep_alive_timer(ctrl);
- mutex_lock(&subsys->lock);
- list_add_tail(&ctrl->subsys_entry, &subsys->ctrls);
- nvmet_setup_p2p_ns_map(ctrl, req);
- mutex_unlock(&subsys->lock);
- *ctrlp = ctrl;
- return 0;
- out_free_sqs:
- kfree(ctrl->sqs);
- out_free_changed_ns_list:
- kfree(ctrl->changed_ns_list);
- out_free_ctrl:
- kfree(ctrl);
- out_put_subsystem:
- nvmet_subsys_put(subsys);
- out:
- return status;
- }
- static void nvmet_ctrl_free(struct kref *ref)
- {
- struct nvmet_ctrl *ctrl = container_of(ref, struct nvmet_ctrl, ref);
- struct nvmet_subsys *subsys = ctrl->subsys;
- mutex_lock(&subsys->lock);
- nvmet_release_p2p_ns_map(ctrl);
- list_del(&ctrl->subsys_entry);
- mutex_unlock(&subsys->lock);
- nvmet_stop_keep_alive_timer(ctrl);
- flush_work(&ctrl->async_event_work);
- cancel_work_sync(&ctrl->fatal_err_work);
- ida_simple_remove(&cntlid_ida, ctrl->cntlid);
- nvmet_async_events_free(ctrl);
- kfree(ctrl->sqs);
- kfree(ctrl->changed_ns_list);
- kfree(ctrl);
- nvmet_subsys_put(subsys);
- }
- void nvmet_ctrl_put(struct nvmet_ctrl *ctrl)
- {
- kref_put(&ctrl->ref, nvmet_ctrl_free);
- }
- void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl)
- {
- mutex_lock(&ctrl->lock);
- if (!(ctrl->csts & NVME_CSTS_CFS)) {
- ctrl->csts |= NVME_CSTS_CFS;
- schedule_work(&ctrl->fatal_err_work);
- }
- mutex_unlock(&ctrl->lock);
- }
- EXPORT_SYMBOL_GPL(nvmet_ctrl_fatal_error);
- static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port,
- const char *subsysnqn)
- {
- struct nvmet_subsys_link *p;
- if (!port)
- return NULL;
- if (!strcmp(NVME_DISC_SUBSYS_NAME, subsysnqn)) {
- if (!kref_get_unless_zero(&nvmet_disc_subsys->ref))
- return NULL;
- return nvmet_disc_subsys;
- }
- down_read(&nvmet_config_sem);
- list_for_each_entry(p, &port->subsystems, entry) {
- if (!strncmp(p->subsys->subsysnqn, subsysnqn,
- NVMF_NQN_SIZE)) {
- if (!kref_get_unless_zero(&p->subsys->ref))
- break;
- up_read(&nvmet_config_sem);
- return p->subsys;
- }
- }
- up_read(&nvmet_config_sem);
- return NULL;
- }
- struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
- enum nvme_subsys_type type)
- {
- struct nvmet_subsys *subsys;
- subsys = kzalloc(sizeof(*subsys), GFP_KERNEL);
- if (!subsys)
- return ERR_PTR(-ENOMEM);
- subsys->ver = NVMET_DEFAULT_VS;
- /* generate a random serial number as our controllers are ephemeral: */
- get_random_bytes(&subsys->serial, sizeof(subsys->serial));
- switch (type) {
- case NVME_NQN_NVME:
- subsys->max_qid = NVMET_NR_QUEUES;
- break;
- case NVME_NQN_DISC:
- subsys->max_qid = 0;
- break;
- default:
- pr_err("%s: Unknown Subsystem type - %d\n", __func__, type);
- kfree(subsys);
- return ERR_PTR(-EINVAL);
- }
- subsys->type = type;
- subsys->subsysnqn = kstrndup(subsysnqn, NVMF_NQN_SIZE,
- GFP_KERNEL);
- if (!subsys->subsysnqn) {
- kfree(subsys);
- return ERR_PTR(-ENOMEM);
- }
- subsys->cntlid_min = NVME_CNTLID_MIN;
- subsys->cntlid_max = NVME_CNTLID_MAX;
- kref_init(&subsys->ref);
- mutex_init(&subsys->lock);
- xa_init(&subsys->namespaces);
- INIT_LIST_HEAD(&subsys->ctrls);
- INIT_LIST_HEAD(&subsys->hosts);
- return subsys;
- }
- static void nvmet_subsys_free(struct kref *ref)
- {
- struct nvmet_subsys *subsys =
- container_of(ref, struct nvmet_subsys, ref);
- WARN_ON_ONCE(!xa_empty(&subsys->namespaces));
- xa_destroy(&subsys->namespaces);
- nvmet_passthru_subsys_free(subsys);
- kfree(subsys->subsysnqn);
- kfree_rcu(subsys->model, rcuhead);
- kfree(subsys);
- }
- void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys)
- {
- struct nvmet_ctrl *ctrl;
- mutex_lock(&subsys->lock);
- list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry)
- ctrl->ops->delete_ctrl(ctrl);
- mutex_unlock(&subsys->lock);
- }
- void nvmet_subsys_put(struct nvmet_subsys *subsys)
- {
- kref_put(&subsys->ref, nvmet_subsys_free);
- }
- static int __init nvmet_init(void)
- {
- int error;
- nvmet_ana_group_enabled[NVMET_DEFAULT_ANA_GRPID] = 1;
- buffered_io_wq = alloc_workqueue("nvmet-buffered-io-wq",
- WQ_MEM_RECLAIM, 0);
- if (!buffered_io_wq) {
- error = -ENOMEM;
- goto out;
- }
- error = nvmet_init_discovery();
- if (error)
- goto out_free_work_queue;
- error = nvmet_init_configfs();
- if (error)
- goto out_exit_discovery;
- return 0;
- out_exit_discovery:
- nvmet_exit_discovery();
- out_free_work_queue:
- destroy_workqueue(buffered_io_wq);
- out:
- return error;
- }
- static void __exit nvmet_exit(void)
- {
- nvmet_exit_configfs();
- nvmet_exit_discovery();
- ida_destroy(&cntlid_ida);
- destroy_workqueue(buffered_io_wq);
- BUILD_BUG_ON(sizeof(struct nvmf_disc_rsp_page_entry) != 1024);
- BUILD_BUG_ON(sizeof(struct nvmf_disc_rsp_page_hdr) != 1024);
- }
- module_init(nvmet_init);
- module_exit(nvmet_exit);
- MODULE_LICENSE("GPL v2");
- MODULE_IMPORT_NS(VFS_internal_I_am_really_a_filesystem_and_am_NOT_a_driver);
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