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- /*
- * zfcp device driver
- *
- * Module interface and handling of zfcp data structures.
- *
- * Copyright IBM Corp. 2002, 2013
- */
- /*
- * 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
- * Steffen Maier
- */
- #define KMSG_COMPONENT "zfcp"
- #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
- #include <linux/miscdevice.h>
- #include <linux/seq_file.h>
- #include <linux/slab.h>
- #include <linux/module.h>
- #include "zfcp_ext.h"
- #include "zfcp_fc.h"
- #include "zfcp_reqlist.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 * __init zfcp_cache_hw_align(const char *name,
- unsigned long size)
- {
- return kmem_cache_create(name, size, roundup_pow_of_two(size), 0, NULL);
- }
- static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun)
- {
- struct ccw_device *cdev;
- struct zfcp_adapter *adapter;
- struct zfcp_port *port;
- cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
- if (!cdev)
- return;
- if (ccw_device_set_online(cdev))
- goto out_ccw_device;
- adapter = zfcp_ccw_adapter_by_cdev(cdev);
- if (!adapter)
- goto out_ccw_device;
- port = zfcp_get_port_by_wwpn(adapter, wwpn);
- if (!port)
- goto out_port;
- flush_work(&port->rport_work);
- zfcp_unit_add(port, lun);
- put_device(&port->dev);
- out_port:
- zfcp_ccw_adapter_put(adapter);
- out_ccw_device:
- put_device(&cdev->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 = kstrdup(devstr, GFP_KERNEL);
- str = str_saved;
- if (!str)
- return;
- 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 || kstrtoull(token, 0, (unsigned long long *) &wwpn))
- goto err_out;
- token = strsep(&str, ",");
- if (!token || kstrtoull(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_fsf_qtcb_cache = zfcp_cache_hw_align("zfcp_fsf_qtcb",
- sizeof(struct fsf_qtcb));
- if (!zfcp_fsf_qtcb_cache)
- goto out_qtcb_cache;
- zfcp_fc_req_cache = zfcp_cache_hw_align("zfcp_fc_req",
- sizeof(struct zfcp_fc_req));
- if (!zfcp_fc_req_cache)
- goto out_fc_cache;
- zfcp_scsi_transport_template =
- fc_attach_transport(&zfcp_transport_functions);
- if (!zfcp_scsi_transport_template)
- goto out_transport;
- scsi_transport_reserve_device(zfcp_scsi_transport_template,
- sizeof(struct zfcp_scsi_dev));
- retval = ccw_driver_register(&zfcp_ccw_driver);
- 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:
- fc_release_transport(zfcp_scsi_transport_template);
- out_transport:
- kmem_cache_destroy(zfcp_fc_req_cache);
- out_fc_cache:
- kmem_cache_destroy(zfcp_fsf_qtcb_cache);
- out_qtcb_cache:
- return retval;
- }
- module_init(zfcp_module_init);
- static void __exit zfcp_module_exit(void)
- {
- ccw_driver_unregister(&zfcp_ccw_driver);
- fc_release_transport(zfcp_scsi_transport_template);
- kmem_cache_destroy(zfcp_fc_req_cache);
- kmem_cache_destroy(zfcp_fsf_qtcb_cache);
- }
- module_exit(zfcp_module_exit);
- /**
- * 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)
- {
- unsigned long flags;
- struct zfcp_port *port;
- read_lock_irqsave(&adapter->port_list_lock, flags);
- list_for_each_entry(port, &adapter->port_list, list)
- if (port->wwpn == wwpn) {
- if (!get_device(&port->dev))
- port = NULL;
- read_unlock_irqrestore(&adapter->port_list_lock, flags);
- return port;
- }
- read_unlock_irqrestore(&adapter->port_list_lock, flags);
- return NULL;
- }
- static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
- {
- 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_fsf_qtcb_cache);
- if (!adapter->pool.qtcb_pool)
- return -ENOMEM;
- BUILD_BUG_ON(sizeof(struct fsf_status_read_buffer) > PAGE_SIZE);
- adapter->pool.sr_data =
- mempool_create_page_pool(FSF_STATUS_READS_RECOM, 0);
- if (!adapter->pool.sr_data)
- return -ENOMEM;
- adapter->pool.gid_pn =
- mempool_create_slab_pool(1, zfcp_fc_req_cache);
- if (!adapter->pool.gid_pn)
- return -ENOMEM;
- return 0;
- }
- static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
- {
- 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.sr_data)
- mempool_destroy(adapter->pool.sr_data);
- if (adapter->pool.gid_pn)
- mempool_destroy(adapter->pool.gid_pn);
- }
- /**
- * 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) >=
- adapter->stat_read_buf_num) {
- zfcp_erp_adapter_reopen(adapter, 0, "axsref1");
- 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 = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
- 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: struct zfcp_adapter*
- * 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.
- */
- struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device)
- {
- struct zfcp_adapter *adapter;
- if (!get_device(&ccw_device->dev))
- return ERR_PTR(-ENODEV);
- adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
- if (!adapter) {
- put_device(&ccw_device->dev);
- return ERR_PTR(-ENOMEM);
- }
- kref_init(&adapter->ref);
- ccw_device->handler = NULL;
- adapter->ccw_device = ccw_device;
- INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
- INIT_DELAYED_WORK(&adapter->scan_work, zfcp_fc_scan_ports);
- INIT_WORK(&adapter->ns_up_work, zfcp_fc_sym_name_update);
- adapter->next_port_scan = jiffies;
- adapter->erp_action.adapter = adapter;
- if (zfcp_qdio_setup(adapter))
- goto failed;
- if (zfcp_allocate_low_mem_buffers(adapter))
- goto failed;
- adapter->req_list = zfcp_reqlist_alloc();
- if (!adapter->req_list)
- goto failed;
- if (zfcp_dbf_adapter_register(adapter))
- goto failed;
- if (zfcp_setup_adapter_work_queue(adapter))
- goto failed;
- if (zfcp_fc_gs_setup(adapter))
- goto failed;
- rwlock_init(&adapter->port_list_lock);
- INIT_LIST_HEAD(&adapter->port_list);
- INIT_LIST_HEAD(&adapter->events.list);
- INIT_WORK(&adapter->events.work, zfcp_fc_post_event);
- spin_lock_init(&adapter->events.list_lock);
- init_waitqueue_head(&adapter->erp_ready_wq);
- init_waitqueue_head(&adapter->erp_done_wqh);
- INIT_LIST_HEAD(&adapter->erp_ready_head);
- INIT_LIST_HEAD(&adapter->erp_running_head);
- rwlock_init(&adapter->erp_lock);
- rwlock_init(&adapter->abort_lock);
- if (zfcp_erp_thread_setup(adapter))
- goto failed;
- adapter->service_level.seq_print = zfcp_print_sl;
- dev_set_drvdata(&ccw_device->dev, adapter);
- if (sysfs_create_group(&ccw_device->dev.kobj,
- &zfcp_sysfs_adapter_attrs))
- goto failed;
- /* report size limit per scatter-gather segment */
- adapter->dma_parms.max_segment_size = ZFCP_QDIO_SBALE_LEN;
- adapter->ccw_device->dev.dma_parms = &adapter->dma_parms;
- adapter->stat_read_buf_num = FSF_STATUS_READS_RECOM;
- if (!zfcp_scsi_adapter_register(adapter))
- return adapter;
- failed:
- zfcp_adapter_unregister(adapter);
- return ERR_PTR(-ENOMEM);
- }
- void zfcp_adapter_unregister(struct zfcp_adapter *adapter)
- {
- struct ccw_device *cdev = adapter->ccw_device;
- cancel_delayed_work_sync(&adapter->scan_work);
- cancel_work_sync(&adapter->stat_work);
- cancel_work_sync(&adapter->ns_up_work);
- zfcp_destroy_adapter_work_queue(adapter);
- zfcp_fc_wka_ports_force_offline(adapter->gs);
- zfcp_scsi_adapter_unregister(adapter);
- sysfs_remove_group(&cdev->dev.kobj, &zfcp_sysfs_adapter_attrs);
- zfcp_erp_thread_kill(adapter);
- zfcp_dbf_adapter_unregister(adapter);
- zfcp_qdio_destroy(adapter->qdio);
- zfcp_ccw_adapter_put(adapter); /* final put to release */
- }
- /**
- * zfcp_adapter_release - remove the adapter from the resource list
- * @ref: pointer to struct kref
- * locks: adapter list write lock is assumed to be held by caller
- */
- void zfcp_adapter_release(struct kref *ref)
- {
- struct zfcp_adapter *adapter = container_of(ref, struct zfcp_adapter,
- ref);
- struct ccw_device *cdev = adapter->ccw_device;
- dev_set_drvdata(&adapter->ccw_device->dev, NULL);
- zfcp_fc_gs_destroy(adapter);
- zfcp_free_low_mem_buffers(adapter);
- kfree(adapter->req_list);
- kfree(adapter->fc_stats);
- kfree(adapter->stats_reset_data);
- kfree(adapter);
- put_device(&cdev->dev);
- }
- static void zfcp_port_release(struct device *dev)
- {
- struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
- zfcp_ccw_adapter_put(port->adapter);
- kfree(port);
- }
- /**
- * 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
- *
- * 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;
- int retval = -ENOMEM;
- kref_get(&adapter->ref);
- port = zfcp_get_port_by_wwpn(adapter, wwpn);
- if (port) {
- put_device(&port->dev);
- retval = -EEXIST;
- goto err_out;
- }
- port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
- if (!port)
- goto err_out;
- rwlock_init(&port->unit_list_lock);
- INIT_LIST_HEAD(&port->unit_list);
- atomic_set(&port->units, 0);
- 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;
- port->dev.parent = &adapter->ccw_device->dev;
- port->dev.groups = zfcp_port_attr_groups;
- port->dev.release = zfcp_port_release;
- port->erp_action.adapter = adapter;
- port->erp_action.port = port;
- if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) {
- kfree(port);
- goto err_out;
- }
- retval = -EINVAL;
- if (device_register(&port->dev)) {
- put_device(&port->dev);
- goto err_out;
- }
- write_lock_irq(&adapter->port_list_lock);
- list_add_tail(&port->list, &adapter->port_list);
- write_unlock_irq(&adapter->port_list_lock);
- atomic_or(status | ZFCP_STATUS_COMMON_RUNNING, &port->status);
- return port;
- err_out:
- zfcp_ccw_adapter_put(adapter);
- return ERR_PTR(retval);
- }
- /**
- * 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;
- }
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