--- /dev/null
+/*
+ * 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 = 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: 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;
+
+ 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;
+
+ 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_set_mask(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;
+}
Code Review / kvmfornfv.git / blobdiff