| /* |
| * zfcp device driver |
| * |
| * Module interface and handling of zfcp data structures. |
| * |
| * Copyright IBM Corporation 2002, 2009 |
| */ |
| |
| /* |
| * Driver authors: |
| * Martin Peschke (originator of the driver) |
| * Raimund Schroeder |
| * Aron Zeh |
| * Wolfgang Taphorn |
| * Stefan Bader |
| * Heiko Carstens (kernel 2.6 port of the driver) |
| * Andreas Herrmann |
| * Maxim Shchetynin |
| * Volker Sameske |
| * Ralph Wuerthner |
| * Michael Loehr |
| * Swen Schillig |
| * Christof Schmitt |
| * Martin Petermann |
| * Sven Schuetz |
| */ |
| |
| #define KMSG_COMPONENT "zfcp" |
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| |
| #include <linux/miscdevice.h> |
| #include <linux/seq_file.h> |
| #include "zfcp_ext.h" |
| |
| #define ZFCP_BUS_ID_SIZE 20 |
| |
| MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com"); |
| MODULE_DESCRIPTION("FCP HBA driver"); |
| MODULE_LICENSE("GPL"); |
| |
| static char *init_device; |
| module_param_named(device, init_device, charp, 0400); |
| MODULE_PARM_DESC(device, "specify initial device"); |
| |
| static struct kmem_cache *zfcp_cache_hw_align(const char *name, |
| unsigned long size) |
| { |
| return kmem_cache_create(name, size, roundup_pow_of_two(size), 0, NULL); |
| } |
| |
| static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter) |
| { |
| int idx; |
| |
| adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head), |
| GFP_KERNEL); |
| if (!adapter->req_list) |
| return -ENOMEM; |
| |
| for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) |
| INIT_LIST_HEAD(&adapter->req_list[idx]); |
| return 0; |
| } |
| |
| /** |
| * zfcp_reqlist_isempty - is the request list empty |
| * @adapter: pointer to struct zfcp_adapter |
| * |
| * Returns: true if list is empty, false otherwise |
| */ |
| int zfcp_reqlist_isempty(struct zfcp_adapter *adapter) |
| { |
| unsigned int idx; |
| |
| for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) |
| if (!list_empty(&adapter->req_list[idx])) |
| return 0; |
| return 1; |
| } |
| |
| static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun) |
| { |
| struct ccw_device *ccwdev; |
| struct zfcp_adapter *adapter; |
| struct zfcp_port *port; |
| struct zfcp_unit *unit; |
| |
| ccwdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid); |
| if (!ccwdev) |
| return; |
| |
| if (ccw_device_set_online(ccwdev)) |
| goto out_ccwdev; |
| |
| mutex_lock(&zfcp_data.config_mutex); |
| adapter = dev_get_drvdata(&ccwdev->dev); |
| if (!adapter) |
| goto out_unlock; |
| zfcp_adapter_get(adapter); |
| |
| port = zfcp_get_port_by_wwpn(adapter, wwpn); |
| if (!port) |
| goto out_port; |
| |
| zfcp_port_get(port); |
| unit = zfcp_unit_enqueue(port, lun); |
| if (IS_ERR(unit)) |
| goto out_unit; |
| mutex_unlock(&zfcp_data.config_mutex); |
| |
| zfcp_erp_unit_reopen(unit, 0, "auidc_1", NULL); |
| zfcp_erp_wait(adapter); |
| flush_work(&unit->scsi_work); |
| |
| mutex_lock(&zfcp_data.config_mutex); |
| zfcp_unit_put(unit); |
| out_unit: |
| zfcp_port_put(port); |
| out_port: |
| zfcp_adapter_put(adapter); |
| out_unlock: |
| mutex_unlock(&zfcp_data.config_mutex); |
| out_ccwdev: |
| put_device(&ccwdev->dev); |
| return; |
| } |
| |
| static void __init zfcp_init_device_setup(char *devstr) |
| { |
| char *token; |
| char *str, *str_saved; |
| char busid[ZFCP_BUS_ID_SIZE]; |
| u64 wwpn, lun; |
| |
| /* duplicate devstr and keep the original for sysfs presentation*/ |
| str_saved = kmalloc(strlen(devstr) + 1, GFP_KERNEL); |
| str = str_saved; |
| if (!str) |
| return; |
| |
| strcpy(str, devstr); |
| |
| token = strsep(&str, ","); |
| if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE) |
| goto err_out; |
| strncpy(busid, token, ZFCP_BUS_ID_SIZE); |
| |
| token = strsep(&str, ","); |
| if (!token || strict_strtoull(token, 0, (unsigned long long *) &wwpn)) |
| goto err_out; |
| |
| token = strsep(&str, ","); |
| if (!token || strict_strtoull(token, 0, (unsigned long long *) &lun)) |
| goto err_out; |
| |
| kfree(str_saved); |
| zfcp_init_device_configure(busid, wwpn, lun); |
| return; |
| |
| err_out: |
| kfree(str_saved); |
| pr_err("%s is not a valid SCSI device\n", devstr); |
| } |
| |
| static int __init zfcp_module_init(void) |
| { |
| int retval = -ENOMEM; |
| |
| zfcp_data.gpn_ft_cache = zfcp_cache_hw_align("zfcp_gpn", |
| sizeof(struct ct_iu_gpn_ft_req)); |
| if (!zfcp_data.gpn_ft_cache) |
| goto out; |
| |
| zfcp_data.qtcb_cache = zfcp_cache_hw_align("zfcp_qtcb", |
| sizeof(struct fsf_qtcb)); |
| if (!zfcp_data.qtcb_cache) |
| goto out_qtcb_cache; |
| |
| zfcp_data.sr_buffer_cache = zfcp_cache_hw_align("zfcp_sr", |
| sizeof(struct fsf_status_read_buffer)); |
| if (!zfcp_data.sr_buffer_cache) |
| goto out_sr_cache; |
| |
| zfcp_data.gid_pn_cache = zfcp_cache_hw_align("zfcp_gid", |
| sizeof(struct zfcp_gid_pn_data)); |
| if (!zfcp_data.gid_pn_cache) |
| goto out_gid_cache; |
| |
| mutex_init(&zfcp_data.config_mutex); |
| rwlock_init(&zfcp_data.config_lock); |
| |
| zfcp_data.scsi_transport_template = |
| fc_attach_transport(&zfcp_transport_functions); |
| if (!zfcp_data.scsi_transport_template) |
| goto out_transport; |
| |
| retval = misc_register(&zfcp_cfdc_misc); |
| if (retval) { |
| pr_err("Registering the misc device zfcp_cfdc failed\n"); |
| goto out_misc; |
| } |
| |
| retval = zfcp_ccw_register(); |
| if (retval) { |
| pr_err("The zfcp device driver could not register with " |
| "the common I/O layer\n"); |
| goto out_ccw_register; |
| } |
| |
| if (init_device) |
| zfcp_init_device_setup(init_device); |
| return 0; |
| |
| out_ccw_register: |
| misc_deregister(&zfcp_cfdc_misc); |
| out_misc: |
| fc_release_transport(zfcp_data.scsi_transport_template); |
| out_transport: |
| kmem_cache_destroy(zfcp_data.gid_pn_cache); |
| out_gid_cache: |
| kmem_cache_destroy(zfcp_data.sr_buffer_cache); |
| out_sr_cache: |
| kmem_cache_destroy(zfcp_data.qtcb_cache); |
| out_qtcb_cache: |
| kmem_cache_destroy(zfcp_data.gpn_ft_cache); |
| out: |
| return retval; |
| } |
| |
| module_init(zfcp_module_init); |
| |
| /** |
| * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN |
| * @port: pointer to port to search for unit |
| * @fcp_lun: FCP LUN to search for |
| * |
| * Returns: pointer to zfcp_unit or NULL |
| */ |
| struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *port, u64 fcp_lun) |
| { |
| struct zfcp_unit *unit; |
| |
| list_for_each_entry(unit, &port->unit_list_head, list) |
| if ((unit->fcp_lun == fcp_lun) && |
| !(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_REMOVE)) |
| return unit; |
| return NULL; |
| } |
| |
| /** |
| * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn |
| * @adapter: pointer to adapter to search for port |
| * @wwpn: wwpn to search for |
| * |
| * Returns: pointer to zfcp_port or NULL |
| */ |
| struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, |
| u64 wwpn) |
| { |
| struct zfcp_port *port; |
| |
| list_for_each_entry(port, &adapter->port_list_head, list) |
| if ((port->wwpn == wwpn) && |
| !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_REMOVE)) |
| return port; |
| return NULL; |
| } |
| |
| static void zfcp_sysfs_unit_release(struct device *dev) |
| { |
| kfree(container_of(dev, struct zfcp_unit, sysfs_device)); |
| } |
| |
| /** |
| * zfcp_unit_enqueue - enqueue unit to unit list of a port. |
| * @port: pointer to port where unit is added |
| * @fcp_lun: FCP LUN of unit to be enqueued |
| * Returns: pointer to enqueued unit on success, ERR_PTR on error |
| * Locks: config_mutex must be held to serialize changes to the unit list |
| * |
| * Sets up some unit internal structures and creates sysfs entry. |
| */ |
| struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, u64 fcp_lun) |
| { |
| struct zfcp_unit *unit; |
| |
| read_lock_irq(&zfcp_data.config_lock); |
| if (zfcp_get_unit_by_lun(port, fcp_lun)) { |
| read_unlock_irq(&zfcp_data.config_lock); |
| return ERR_PTR(-EINVAL); |
| } |
| read_unlock_irq(&zfcp_data.config_lock); |
| |
| unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL); |
| if (!unit) |
| return ERR_PTR(-ENOMEM); |
| |
| atomic_set(&unit->refcount, 0); |
| init_waitqueue_head(&unit->remove_wq); |
| INIT_WORK(&unit->scsi_work, zfcp_scsi_scan); |
| |
| unit->port = port; |
| unit->fcp_lun = fcp_lun; |
| |
| if (dev_set_name(&unit->sysfs_device, "0x%016llx", |
| (unsigned long long) fcp_lun)) { |
| kfree(unit); |
| return ERR_PTR(-ENOMEM); |
| } |
| unit->sysfs_device.parent = &port->sysfs_device; |
| unit->sysfs_device.release = zfcp_sysfs_unit_release; |
| dev_set_drvdata(&unit->sysfs_device, unit); |
| |
| /* mark unit unusable as long as sysfs registration is not complete */ |
| atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status); |
| |
| spin_lock_init(&unit->latencies.lock); |
| unit->latencies.write.channel.min = 0xFFFFFFFF; |
| unit->latencies.write.fabric.min = 0xFFFFFFFF; |
| unit->latencies.read.channel.min = 0xFFFFFFFF; |
| unit->latencies.read.fabric.min = 0xFFFFFFFF; |
| unit->latencies.cmd.channel.min = 0xFFFFFFFF; |
| unit->latencies.cmd.fabric.min = 0xFFFFFFFF; |
| |
| if (device_register(&unit->sysfs_device)) { |
| put_device(&unit->sysfs_device); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| if (sysfs_create_group(&unit->sysfs_device.kobj, |
| &zfcp_sysfs_unit_attrs)) { |
| device_unregister(&unit->sysfs_device); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| zfcp_unit_get(unit); |
| |
| write_lock_irq(&zfcp_data.config_lock); |
| list_add_tail(&unit->list, &port->unit_list_head); |
| atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status); |
| atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status); |
| |
| write_unlock_irq(&zfcp_data.config_lock); |
| |
| zfcp_port_get(port); |
| |
| return unit; |
| } |
| |
| /** |
| * zfcp_unit_dequeue - dequeue unit |
| * @unit: pointer to zfcp_unit |
| * |
| * waits until all work is done on unit and removes it then from the unit->list |
| * of the associated port. |
| */ |
| void zfcp_unit_dequeue(struct zfcp_unit *unit) |
| { |
| wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0); |
| write_lock_irq(&zfcp_data.config_lock); |
| list_del(&unit->list); |
| write_unlock_irq(&zfcp_data.config_lock); |
| zfcp_port_put(unit->port); |
| sysfs_remove_group(&unit->sysfs_device.kobj, &zfcp_sysfs_unit_attrs); |
| device_unregister(&unit->sysfs_device); |
| } |
| |
| static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter) |
| { |
| /* must only be called with zfcp_data.config_mutex taken */ |
| adapter->pool.erp_req = |
| mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); |
| if (!adapter->pool.erp_req) |
| return -ENOMEM; |
| |
| adapter->pool.gid_pn_req = |
| mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); |
| if (!adapter->pool.gid_pn_req) |
| return -ENOMEM; |
| |
| adapter->pool.scsi_req = |
| mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); |
| if (!adapter->pool.scsi_req) |
| return -ENOMEM; |
| |
| adapter->pool.scsi_abort = |
| mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); |
| if (!adapter->pool.scsi_abort) |
| return -ENOMEM; |
| |
| adapter->pool.status_read_req = |
| mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM, |
| sizeof(struct zfcp_fsf_req)); |
| if (!adapter->pool.status_read_req) |
| return -ENOMEM; |
| |
| adapter->pool.qtcb_pool = |
| mempool_create_slab_pool(4, zfcp_data.qtcb_cache); |
| if (!adapter->pool.qtcb_pool) |
| return -ENOMEM; |
| |
| adapter->pool.status_read_data = |
| mempool_create_slab_pool(FSF_STATUS_READS_RECOM, |
| zfcp_data.sr_buffer_cache); |
| if (!adapter->pool.status_read_data) |
| return -ENOMEM; |
| |
| adapter->pool.gid_pn_data = |
| mempool_create_slab_pool(1, zfcp_data.gid_pn_cache); |
| if (!adapter->pool.gid_pn_data) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter) |
| { |
| /* zfcp_data.config_mutex must be held */ |
| if (adapter->pool.erp_req) |
| mempool_destroy(adapter->pool.erp_req); |
| if (adapter->pool.scsi_req) |
| mempool_destroy(adapter->pool.scsi_req); |
| if (adapter->pool.scsi_abort) |
| mempool_destroy(adapter->pool.scsi_abort); |
| if (adapter->pool.qtcb_pool) |
| mempool_destroy(adapter->pool.qtcb_pool); |
| if (adapter->pool.status_read_req) |
| mempool_destroy(adapter->pool.status_read_req); |
| if (adapter->pool.status_read_data) |
| mempool_destroy(adapter->pool.status_read_data); |
| if (adapter->pool.gid_pn_data) |
| mempool_destroy(adapter->pool.gid_pn_data); |
| } |
| |
| /** |
| * zfcp_status_read_refill - refill the long running status_read_requests |
| * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled |
| * |
| * Returns: 0 on success, 1 otherwise |
| * |
| * if there are 16 or more status_read requests missing an adapter_reopen |
| * is triggered |
| */ |
| int zfcp_status_read_refill(struct zfcp_adapter *adapter) |
| { |
| while (atomic_read(&adapter->stat_miss) > 0) |
| if (zfcp_fsf_status_read(adapter->qdio)) { |
| if (atomic_read(&adapter->stat_miss) >= 16) { |
| zfcp_erp_adapter_reopen(adapter, 0, "axsref1", |
| NULL); |
| return 1; |
| } |
| break; |
| } else |
| atomic_dec(&adapter->stat_miss); |
| return 0; |
| } |
| |
| static void _zfcp_status_read_scheduler(struct work_struct *work) |
| { |
| zfcp_status_read_refill(container_of(work, struct zfcp_adapter, |
| stat_work)); |
| } |
| |
| static void zfcp_print_sl(struct seq_file *m, struct service_level *sl) |
| { |
| struct zfcp_adapter *adapter = |
| container_of(sl, struct zfcp_adapter, service_level); |
| |
| seq_printf(m, "zfcp: %s microcode level %x\n", |
| dev_name(&adapter->ccw_device->dev), |
| adapter->fsf_lic_version); |
| } |
| |
| static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter) |
| { |
| char name[TASK_COMM_LEN]; |
| |
| snprintf(name, sizeof(name), "zfcp_q_%s", |
| dev_name(&adapter->ccw_device->dev)); |
| adapter->work_queue = create_singlethread_workqueue(name); |
| |
| if (adapter->work_queue) |
| return 0; |
| return -ENOMEM; |
| } |
| |
| static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter) |
| { |
| if (adapter->work_queue) |
| destroy_workqueue(adapter->work_queue); |
| adapter->work_queue = NULL; |
| |
| } |
| |
| /** |
| * zfcp_adapter_enqueue - enqueue a new adapter to the list |
| * @ccw_device: pointer to the struct cc_device |
| * |
| * Returns: 0 if a new adapter was successfully enqueued |
| * -ENOMEM if alloc failed |
| * Enqueues an adapter at the end of the adapter list in the driver data. |
| * All adapter internal structures are set up. |
| * Proc-fs entries are also created. |
| * locks: config_mutex must be held to serialize changes to the adapter list |
| */ |
| int zfcp_adapter_enqueue(struct ccw_device *ccw_device) |
| { |
| struct zfcp_adapter *adapter; |
| |
| /* |
| * Note: It is safe to release the list_lock, as any list changes |
| * are protected by the config_mutex, which must be held to get here |
| */ |
| |
| adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL); |
| if (!adapter) |
| return -ENOMEM; |
| |
| ccw_device->handler = NULL; |
| adapter->ccw_device = ccw_device; |
| atomic_set(&adapter->refcount, 0); |
| |
| if (zfcp_qdio_setup(adapter)) |
| goto qdio_failed; |
| |
| if (zfcp_allocate_low_mem_buffers(adapter)) |
| goto low_mem_buffers_failed; |
| |
| if (zfcp_reqlist_alloc(adapter)) |
| goto low_mem_buffers_failed; |
| |
| if (zfcp_dbf_adapter_register(adapter)) |
| goto debug_register_failed; |
| |
| if (zfcp_setup_adapter_work_queue(adapter)) |
| goto work_queue_failed; |
| |
| if (zfcp_fc_gs_setup(adapter)) |
| goto generic_services_failed; |
| |
| init_waitqueue_head(&adapter->remove_wq); |
| init_waitqueue_head(&adapter->erp_ready_wq); |
| init_waitqueue_head(&adapter->erp_done_wqh); |
| |
| INIT_LIST_HEAD(&adapter->port_list_head); |
| INIT_LIST_HEAD(&adapter->erp_ready_head); |
| INIT_LIST_HEAD(&adapter->erp_running_head); |
| |
| spin_lock_init(&adapter->req_list_lock); |
| |
| rwlock_init(&adapter->erp_lock); |
| rwlock_init(&adapter->abort_lock); |
| |
| if (zfcp_erp_thread_setup(adapter)) |
| goto erp_thread_failed; |
| |
| INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler); |
| INIT_WORK(&adapter->scan_work, _zfcp_fc_scan_ports_later); |
| |
| adapter->service_level.seq_print = zfcp_print_sl; |
| |
| /* mark adapter unusable as long as sysfs registration is not complete */ |
| atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status); |
| |
| dev_set_drvdata(&ccw_device->dev, adapter); |
| |
| if (sysfs_create_group(&ccw_device->dev.kobj, |
| &zfcp_sysfs_adapter_attrs)) |
| goto sysfs_failed; |
| |
| atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status); |
| |
| if (!zfcp_adapter_scsi_register(adapter)) |
| return 0; |
| |
| sysfs_failed: |
| zfcp_erp_thread_kill(adapter); |
| erp_thread_failed: |
| zfcp_fc_gs_destroy(adapter); |
| generic_services_failed: |
| zfcp_destroy_adapter_work_queue(adapter); |
| work_queue_failed: |
| zfcp_dbf_adapter_unregister(adapter->dbf); |
| debug_register_failed: |
| dev_set_drvdata(&ccw_device->dev, NULL); |
| kfree(adapter->req_list); |
| low_mem_buffers_failed: |
| zfcp_free_low_mem_buffers(adapter); |
| qdio_failed: |
| zfcp_qdio_destroy(adapter->qdio); |
| kfree(adapter); |
| return -ENOMEM; |
| } |
| |
| /** |
| * zfcp_adapter_dequeue - remove the adapter from the resource list |
| * @adapter: pointer to struct zfcp_adapter which should be removed |
| * locks: adapter list write lock is assumed to be held by caller |
| */ |
| void zfcp_adapter_dequeue(struct zfcp_adapter *adapter) |
| { |
| int retval = 0; |
| unsigned long flags; |
| |
| cancel_work_sync(&adapter->stat_work); |
| zfcp_fc_wka_ports_force_offline(adapter->gs); |
| sysfs_remove_group(&adapter->ccw_device->dev.kobj, |
| &zfcp_sysfs_adapter_attrs); |
| dev_set_drvdata(&adapter->ccw_device->dev, NULL); |
| /* sanity check: no pending FSF requests */ |
| spin_lock_irqsave(&adapter->req_list_lock, flags); |
| retval = zfcp_reqlist_isempty(adapter); |
| spin_unlock_irqrestore(&adapter->req_list_lock, flags); |
| if (!retval) |
| return; |
| |
| zfcp_fc_gs_destroy(adapter); |
| zfcp_erp_thread_kill(adapter); |
| zfcp_destroy_adapter_work_queue(adapter); |
| zfcp_dbf_adapter_unregister(adapter->dbf); |
| zfcp_free_low_mem_buffers(adapter); |
| zfcp_qdio_destroy(adapter->qdio); |
| kfree(adapter->req_list); |
| kfree(adapter->fc_stats); |
| kfree(adapter->stats_reset_data); |
| kfree(adapter); |
| } |
| |
| static void zfcp_sysfs_port_release(struct device *dev) |
| { |
| kfree(container_of(dev, struct zfcp_port, sysfs_device)); |
| } |
| |
| /** |
| * zfcp_port_enqueue - enqueue port to port list of adapter |
| * @adapter: adapter where remote port is added |
| * @wwpn: WWPN of the remote port to be enqueued |
| * @status: initial status for the port |
| * @d_id: destination id of the remote port to be enqueued |
| * Returns: pointer to enqueued port on success, ERR_PTR on error |
| * Locks: config_mutex must be held to serialize changes to the port list |
| * |
| * All port internal structures are set up and the sysfs entry is generated. |
| * d_id is used to enqueue ports with a well known address like the Directory |
| * Service for nameserver lookup. |
| */ |
| struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn, |
| u32 status, u32 d_id) |
| { |
| struct zfcp_port *port; |
| |
| read_lock_irq(&zfcp_data.config_lock); |
| if (zfcp_get_port_by_wwpn(adapter, wwpn)) { |
| read_unlock_irq(&zfcp_data.config_lock); |
| return ERR_PTR(-EINVAL); |
| } |
| read_unlock_irq(&zfcp_data.config_lock); |
| |
| port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL); |
| if (!port) |
| return ERR_PTR(-ENOMEM); |
| |
| init_waitqueue_head(&port->remove_wq); |
| INIT_LIST_HEAD(&port->unit_list_head); |
| INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup); |
| INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work); |
| INIT_WORK(&port->rport_work, zfcp_scsi_rport_work); |
| |
| port->adapter = adapter; |
| port->d_id = d_id; |
| port->wwpn = wwpn; |
| port->rport_task = RPORT_NONE; |
| |
| /* mark port unusable as long as sysfs registration is not complete */ |
| atomic_set_mask(status | ZFCP_STATUS_COMMON_REMOVE, &port->status); |
| atomic_set(&port->refcount, 0); |
| |
| if (dev_set_name(&port->sysfs_device, "0x%016llx", |
| (unsigned long long)wwpn)) { |
| kfree(port); |
| return ERR_PTR(-ENOMEM); |
| } |
| port->sysfs_device.parent = &adapter->ccw_device->dev; |
| port->sysfs_device.release = zfcp_sysfs_port_release; |
| dev_set_drvdata(&port->sysfs_device, port); |
| |
| if (device_register(&port->sysfs_device)) { |
| put_device(&port->sysfs_device); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| if (sysfs_create_group(&port->sysfs_device.kobj, |
| &zfcp_sysfs_port_attrs)) { |
| device_unregister(&port->sysfs_device); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| zfcp_port_get(port); |
| |
| write_lock_irq(&zfcp_data.config_lock); |
| list_add_tail(&port->list, &adapter->port_list_head); |
| atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status); |
| atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status); |
| |
| write_unlock_irq(&zfcp_data.config_lock); |
| |
| zfcp_adapter_get(adapter); |
| return port; |
| } |
| |
| /** |
| * zfcp_port_dequeue - dequeues a port from the port list of the adapter |
| * @port: pointer to struct zfcp_port which should be removed |
| */ |
| void zfcp_port_dequeue(struct zfcp_port *port) |
| { |
| write_lock_irq(&zfcp_data.config_lock); |
| list_del(&port->list); |
| write_unlock_irq(&zfcp_data.config_lock); |
| wait_event(port->remove_wq, atomic_read(&port->refcount) == 0); |
| cancel_work_sync(&port->rport_work); /* usually not necessary */ |
| zfcp_adapter_put(port->adapter); |
| sysfs_remove_group(&port->sysfs_device.kobj, &zfcp_sysfs_port_attrs); |
| device_unregister(&port->sysfs_device); |
| } |
| |
| /** |
| * zfcp_sg_free_table - free memory used by scatterlists |
| * @sg: pointer to scatterlist |
| * @count: number of scatterlist which are to be free'ed |
| * the scatterlist are expected to reference pages always |
| */ |
| void zfcp_sg_free_table(struct scatterlist *sg, int count) |
| { |
| int i; |
| |
| for (i = 0; i < count; i++, sg++) |
| if (sg) |
| free_page((unsigned long) sg_virt(sg)); |
| else |
| break; |
| } |
| |
| /** |
| * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers |
| * @sg: pointer to struct scatterlist |
| * @count: number of scatterlists which should be assigned with buffers |
| * of size page |
| * |
| * Returns: 0 on success, -ENOMEM otherwise |
| */ |
| int zfcp_sg_setup_table(struct scatterlist *sg, int count) |
| { |
| void *addr; |
| int i; |
| |
| sg_init_table(sg, count); |
| for (i = 0; i < count; i++, sg++) { |
| addr = (void *) get_zeroed_page(GFP_KERNEL); |
| if (!addr) { |
| zfcp_sg_free_table(sg, i); |
| return -ENOMEM; |
| } |
| sg_set_buf(sg, addr, PAGE_SIZE); |
| } |
| return 0; |
| } |