PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / s390 / scsi / zfcp_aux.c
blob8004b071a9f2e59f5cb9bbe90993ff7b108f973c
1 /*
2 * zfcp device driver
4 * Module interface and handling of zfcp data structures.
6 * Copyright IBM Corp. 2002, 2013
7 */
9 /*
10 * Driver authors:
11 * Martin Peschke (originator of the driver)
12 * Raimund Schroeder
13 * Aron Zeh
14 * Wolfgang Taphorn
15 * Stefan Bader
16 * Heiko Carstens (kernel 2.6 port of the driver)
17 * Andreas Herrmann
18 * Maxim Shchetynin
19 * Volker Sameske
20 * Ralph Wuerthner
21 * Michael Loehr
22 * Swen Schillig
23 * Christof Schmitt
24 * Martin Petermann
25 * Sven Schuetz
26 * Steffen Maier
29 #define KMSG_COMPONENT "zfcp"
30 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
32 #include <linux/miscdevice.h>
33 #include <linux/seq_file.h>
34 #include <linux/slab.h>
35 #include <linux/module.h>
36 #include "zfcp_ext.h"
37 #include "zfcp_fc.h"
38 #include "zfcp_reqlist.h"
40 #define ZFCP_BUS_ID_SIZE 20
42 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
43 MODULE_DESCRIPTION("FCP HBA driver");
44 MODULE_LICENSE("GPL");
46 static char *init_device;
47 module_param_named(device, init_device, charp, 0400);
48 MODULE_PARM_DESC(device, "specify initial device");
50 static struct kmem_cache * __init zfcp_cache_hw_align(const char *name,
51 unsigned long size)
53 return kmem_cache_create(name, size, roundup_pow_of_two(size), 0, NULL);
56 static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun)
58 struct ccw_device *cdev;
59 struct zfcp_adapter *adapter;
60 struct zfcp_port *port;
62 cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
63 if (!cdev)
64 return;
66 if (ccw_device_set_online(cdev))
67 goto out_ccw_device;
69 adapter = zfcp_ccw_adapter_by_cdev(cdev);
70 if (!adapter)
71 goto out_ccw_device;
73 port = zfcp_get_port_by_wwpn(adapter, wwpn);
74 if (!port)
75 goto out_port;
76 flush_work(&port->rport_work);
78 zfcp_unit_add(port, lun);
79 put_device(&port->dev);
81 out_port:
82 zfcp_ccw_adapter_put(adapter);
83 out_ccw_device:
84 put_device(&cdev->dev);
85 return;
88 static void __init zfcp_init_device_setup(char *devstr)
90 char *token;
91 char *str, *str_saved;
92 char busid[ZFCP_BUS_ID_SIZE];
93 u64 wwpn, lun;
95 /* duplicate devstr and keep the original for sysfs presentation*/
96 str_saved = kstrdup(devstr, GFP_KERNEL);
97 str = str_saved;
98 if (!str)
99 return;
101 token = strsep(&str, ",");
102 if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE)
103 goto err_out;
104 strncpy(busid, token, ZFCP_BUS_ID_SIZE);
106 token = strsep(&str, ",");
107 if (!token || kstrtoull(token, 0, (unsigned long long *) &wwpn))
108 goto err_out;
110 token = strsep(&str, ",");
111 if (!token || kstrtoull(token, 0, (unsigned long long *) &lun))
112 goto err_out;
114 kfree(str_saved);
115 zfcp_init_device_configure(busid, wwpn, lun);
116 return;
118 err_out:
119 kfree(str_saved);
120 pr_err("%s is not a valid SCSI device\n", devstr);
123 static int __init zfcp_module_init(void)
125 int retval = -ENOMEM;
127 zfcp_fsf_qtcb_cache = zfcp_cache_hw_align("zfcp_fsf_qtcb",
128 sizeof(struct fsf_qtcb));
129 if (!zfcp_fsf_qtcb_cache)
130 goto out_qtcb_cache;
132 zfcp_fc_req_cache = zfcp_cache_hw_align("zfcp_fc_req",
133 sizeof(struct zfcp_fc_req));
134 if (!zfcp_fc_req_cache)
135 goto out_fc_cache;
137 zfcp_scsi_transport_template =
138 fc_attach_transport(&zfcp_transport_functions);
139 if (!zfcp_scsi_transport_template)
140 goto out_transport;
141 scsi_transport_reserve_device(zfcp_scsi_transport_template,
142 sizeof(struct zfcp_scsi_dev));
144 retval = ccw_driver_register(&zfcp_ccw_driver);
145 if (retval) {
146 pr_err("The zfcp device driver could not register with "
147 "the common I/O layer\n");
148 goto out_ccw_register;
151 if (init_device)
152 zfcp_init_device_setup(init_device);
153 return 0;
155 out_ccw_register:
156 fc_release_transport(zfcp_scsi_transport_template);
157 out_transport:
158 kmem_cache_destroy(zfcp_fc_req_cache);
159 out_fc_cache:
160 kmem_cache_destroy(zfcp_fsf_qtcb_cache);
161 out_qtcb_cache:
162 return retval;
165 module_init(zfcp_module_init);
167 static void __exit zfcp_module_exit(void)
169 ccw_driver_unregister(&zfcp_ccw_driver);
170 fc_release_transport(zfcp_scsi_transport_template);
171 kmem_cache_destroy(zfcp_fc_req_cache);
172 kmem_cache_destroy(zfcp_fsf_qtcb_cache);
175 module_exit(zfcp_module_exit);
178 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
179 * @adapter: pointer to adapter to search for port
180 * @wwpn: wwpn to search for
182 * Returns: pointer to zfcp_port or NULL
184 struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
185 u64 wwpn)
187 unsigned long flags;
188 struct zfcp_port *port;
190 read_lock_irqsave(&adapter->port_list_lock, flags);
191 list_for_each_entry(port, &adapter->port_list, list)
192 if (port->wwpn == wwpn) {
193 if (!get_device(&port->dev))
194 port = NULL;
195 read_unlock_irqrestore(&adapter->port_list_lock, flags);
196 return port;
198 read_unlock_irqrestore(&adapter->port_list_lock, flags);
199 return NULL;
202 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
204 adapter->pool.erp_req =
205 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
206 if (!adapter->pool.erp_req)
207 return -ENOMEM;
209 adapter->pool.gid_pn_req =
210 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
211 if (!adapter->pool.gid_pn_req)
212 return -ENOMEM;
214 adapter->pool.scsi_req =
215 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
216 if (!adapter->pool.scsi_req)
217 return -ENOMEM;
219 adapter->pool.scsi_abort =
220 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
221 if (!adapter->pool.scsi_abort)
222 return -ENOMEM;
224 adapter->pool.status_read_req =
225 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
226 sizeof(struct zfcp_fsf_req));
227 if (!adapter->pool.status_read_req)
228 return -ENOMEM;
230 adapter->pool.qtcb_pool =
231 mempool_create_slab_pool(4, zfcp_fsf_qtcb_cache);
232 if (!adapter->pool.qtcb_pool)
233 return -ENOMEM;
235 BUILD_BUG_ON(sizeof(struct fsf_status_read_buffer) > PAGE_SIZE);
236 adapter->pool.sr_data =
237 mempool_create_page_pool(FSF_STATUS_READS_RECOM, 0);
238 if (!adapter->pool.sr_data)
239 return -ENOMEM;
241 adapter->pool.gid_pn =
242 mempool_create_slab_pool(1, zfcp_fc_req_cache);
243 if (!adapter->pool.gid_pn)
244 return -ENOMEM;
246 return 0;
249 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
251 if (adapter->pool.erp_req)
252 mempool_destroy(adapter->pool.erp_req);
253 if (adapter->pool.scsi_req)
254 mempool_destroy(adapter->pool.scsi_req);
255 if (adapter->pool.scsi_abort)
256 mempool_destroy(adapter->pool.scsi_abort);
257 if (adapter->pool.qtcb_pool)
258 mempool_destroy(adapter->pool.qtcb_pool);
259 if (adapter->pool.status_read_req)
260 mempool_destroy(adapter->pool.status_read_req);
261 if (adapter->pool.sr_data)
262 mempool_destroy(adapter->pool.sr_data);
263 if (adapter->pool.gid_pn)
264 mempool_destroy(adapter->pool.gid_pn);
268 * zfcp_status_read_refill - refill the long running status_read_requests
269 * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
271 * Returns: 0 on success, 1 otherwise
273 * if there are 16 or more status_read requests missing an adapter_reopen
274 * is triggered
276 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
278 while (atomic_read(&adapter->stat_miss) > 0)
279 if (zfcp_fsf_status_read(adapter->qdio)) {
280 if (atomic_read(&adapter->stat_miss) >=
281 adapter->stat_read_buf_num) {
282 zfcp_erp_adapter_reopen(adapter, 0, "axsref1");
283 return 1;
285 break;
286 } else
287 atomic_dec(&adapter->stat_miss);
288 return 0;
291 static void _zfcp_status_read_scheduler(struct work_struct *work)
293 zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
294 stat_work));
297 static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)
299 struct zfcp_adapter *adapter =
300 container_of(sl, struct zfcp_adapter, service_level);
302 seq_printf(m, "zfcp: %s microcode level %x\n",
303 dev_name(&adapter->ccw_device->dev),
304 adapter->fsf_lic_version);
307 static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter)
309 char name[TASK_COMM_LEN];
311 snprintf(name, sizeof(name), "zfcp_q_%s",
312 dev_name(&adapter->ccw_device->dev));
313 adapter->work_queue = create_singlethread_workqueue(name);
315 if (adapter->work_queue)
316 return 0;
317 return -ENOMEM;
320 static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter)
322 if (adapter->work_queue)
323 destroy_workqueue(adapter->work_queue);
324 adapter->work_queue = NULL;
329 * zfcp_adapter_enqueue - enqueue a new adapter to the list
330 * @ccw_device: pointer to the struct cc_device
332 * Returns: struct zfcp_adapter*
333 * Enqueues an adapter at the end of the adapter list in the driver data.
334 * All adapter internal structures are set up.
335 * Proc-fs entries are also created.
337 struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device)
339 struct zfcp_adapter *adapter;
341 if (!get_device(&ccw_device->dev))
342 return ERR_PTR(-ENODEV);
344 adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
345 if (!adapter) {
346 put_device(&ccw_device->dev);
347 return ERR_PTR(-ENOMEM);
350 kref_init(&adapter->ref);
352 ccw_device->handler = NULL;
353 adapter->ccw_device = ccw_device;
355 INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
356 INIT_WORK(&adapter->scan_work, zfcp_fc_scan_ports);
357 INIT_WORK(&adapter->ns_up_work, zfcp_fc_sym_name_update);
359 if (zfcp_qdio_setup(adapter))
360 goto failed;
362 if (zfcp_allocate_low_mem_buffers(adapter))
363 goto failed;
365 adapter->req_list = zfcp_reqlist_alloc();
366 if (!adapter->req_list)
367 goto failed;
369 if (zfcp_dbf_adapter_register(adapter))
370 goto failed;
372 if (zfcp_setup_adapter_work_queue(adapter))
373 goto failed;
375 if (zfcp_fc_gs_setup(adapter))
376 goto failed;
378 rwlock_init(&adapter->port_list_lock);
379 INIT_LIST_HEAD(&adapter->port_list);
381 INIT_LIST_HEAD(&adapter->events.list);
382 INIT_WORK(&adapter->events.work, zfcp_fc_post_event);
383 spin_lock_init(&adapter->events.list_lock);
385 init_waitqueue_head(&adapter->erp_ready_wq);
386 init_waitqueue_head(&adapter->erp_done_wqh);
388 INIT_LIST_HEAD(&adapter->erp_ready_head);
389 INIT_LIST_HEAD(&adapter->erp_running_head);
391 rwlock_init(&adapter->erp_lock);
392 rwlock_init(&adapter->abort_lock);
394 if (zfcp_erp_thread_setup(adapter))
395 goto failed;
397 adapter->service_level.seq_print = zfcp_print_sl;
399 dev_set_drvdata(&ccw_device->dev, adapter);
401 if (sysfs_create_group(&ccw_device->dev.kobj,
402 &zfcp_sysfs_adapter_attrs))
403 goto failed;
405 /* report size limit per scatter-gather segment */
406 adapter->dma_parms.max_segment_size = ZFCP_QDIO_SBALE_LEN;
407 adapter->ccw_device->dev.dma_parms = &adapter->dma_parms;
409 adapter->stat_read_buf_num = FSF_STATUS_READS_RECOM;
411 if (!zfcp_scsi_adapter_register(adapter))
412 return adapter;
414 failed:
415 zfcp_adapter_unregister(adapter);
416 return ERR_PTR(-ENOMEM);
419 void zfcp_adapter_unregister(struct zfcp_adapter *adapter)
421 struct ccw_device *cdev = adapter->ccw_device;
423 cancel_work_sync(&adapter->scan_work);
424 cancel_work_sync(&adapter->stat_work);
425 cancel_work_sync(&adapter->ns_up_work);
426 zfcp_destroy_adapter_work_queue(adapter);
428 zfcp_fc_wka_ports_force_offline(adapter->gs);
429 zfcp_scsi_adapter_unregister(adapter);
430 sysfs_remove_group(&cdev->dev.kobj, &zfcp_sysfs_adapter_attrs);
432 zfcp_erp_thread_kill(adapter);
433 zfcp_dbf_adapter_unregister(adapter);
434 zfcp_qdio_destroy(adapter->qdio);
436 zfcp_ccw_adapter_put(adapter); /* final put to release */
440 * zfcp_adapter_release - remove the adapter from the resource list
441 * @ref: pointer to struct kref
442 * locks: adapter list write lock is assumed to be held by caller
444 void zfcp_adapter_release(struct kref *ref)
446 struct zfcp_adapter *adapter = container_of(ref, struct zfcp_adapter,
447 ref);
448 struct ccw_device *cdev = adapter->ccw_device;
450 dev_set_drvdata(&adapter->ccw_device->dev, NULL);
451 zfcp_fc_gs_destroy(adapter);
452 zfcp_free_low_mem_buffers(adapter);
453 kfree(adapter->req_list);
454 kfree(adapter->fc_stats);
455 kfree(adapter->stats_reset_data);
456 kfree(adapter);
457 put_device(&cdev->dev);
460 static void zfcp_port_release(struct device *dev)
462 struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
464 zfcp_ccw_adapter_put(port->adapter);
465 kfree(port);
469 * zfcp_port_enqueue - enqueue port to port list of adapter
470 * @adapter: adapter where remote port is added
471 * @wwpn: WWPN of the remote port to be enqueued
472 * @status: initial status for the port
473 * @d_id: destination id of the remote port to be enqueued
474 * Returns: pointer to enqueued port on success, ERR_PTR on error
476 * All port internal structures are set up and the sysfs entry is generated.
477 * d_id is used to enqueue ports with a well known address like the Directory
478 * Service for nameserver lookup.
480 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
481 u32 status, u32 d_id)
483 struct zfcp_port *port;
484 int retval = -ENOMEM;
486 kref_get(&adapter->ref);
488 port = zfcp_get_port_by_wwpn(adapter, wwpn);
489 if (port) {
490 put_device(&port->dev);
491 retval = -EEXIST;
492 goto err_out;
495 port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
496 if (!port)
497 goto err_out;
499 rwlock_init(&port->unit_list_lock);
500 INIT_LIST_HEAD(&port->unit_list);
501 atomic_set(&port->units, 0);
503 INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup);
504 INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);
505 INIT_WORK(&port->rport_work, zfcp_scsi_rport_work);
507 port->adapter = adapter;
508 port->d_id = d_id;
509 port->wwpn = wwpn;
510 port->rport_task = RPORT_NONE;
511 port->dev.parent = &adapter->ccw_device->dev;
512 port->dev.groups = zfcp_port_attr_groups;
513 port->dev.release = zfcp_port_release;
515 if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) {
516 kfree(port);
517 goto err_out;
519 retval = -EINVAL;
521 if (device_register(&port->dev)) {
522 put_device(&port->dev);
523 goto err_out;
526 write_lock_irq(&adapter->port_list_lock);
527 list_add_tail(&port->list, &adapter->port_list);
528 write_unlock_irq(&adapter->port_list_lock);
530 atomic_set_mask(status | ZFCP_STATUS_COMMON_RUNNING, &port->status);
532 return port;
534 err_out:
535 zfcp_ccw_adapter_put(adapter);
536 return ERR_PTR(retval);
540 * zfcp_sg_free_table - free memory used by scatterlists
541 * @sg: pointer to scatterlist
542 * @count: number of scatterlist which are to be free'ed
543 * the scatterlist are expected to reference pages always
545 void zfcp_sg_free_table(struct scatterlist *sg, int count)
547 int i;
549 for (i = 0; i < count; i++, sg++)
550 if (sg)
551 free_page((unsigned long) sg_virt(sg));
552 else
553 break;
557 * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers
558 * @sg: pointer to struct scatterlist
559 * @count: number of scatterlists which should be assigned with buffers
560 * of size page
562 * Returns: 0 on success, -ENOMEM otherwise
564 int zfcp_sg_setup_table(struct scatterlist *sg, int count)
566 void *addr;
567 int i;
569 sg_init_table(sg, count);
570 for (i = 0; i < count; i++, sg++) {
571 addr = (void *) get_zeroed_page(GFP_KERNEL);
572 if (!addr) {
573 zfcp_sg_free_table(sg, i);
574 return -ENOMEM;
576 sg_set_buf(sg, addr, PAGE_SIZE);
578 return 0;