4 * Module interface and handling of zfcp data structures.
6 * Copyright IBM Corporation 2002, 2008
11 * Martin Peschke (originator of the driver)
16 * Heiko Carstens (kernel 2.6 port of the driver)
28 #include <linux/miscdevice.h>
33 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
34 MODULE_DESCRIPTION("FCP HBA driver");
35 MODULE_LICENSE("GPL");
37 module_param(device
, charp
, 0400);
38 MODULE_PARM_DESC(device
, "specify initial device");
40 static int zfcp_reqlist_alloc(struct zfcp_adapter
*adapter
)
44 adapter
->req_list
= kcalloc(REQUEST_LIST_SIZE
, sizeof(struct list_head
),
46 if (!adapter
->req_list
)
49 for (idx
= 0; idx
< REQUEST_LIST_SIZE
; idx
++)
50 INIT_LIST_HEAD(&adapter
->req_list
[idx
]);
55 * zfcp_reqlist_isempty - is the request list empty
56 * @adapter: pointer to struct zfcp_adapter
58 * Returns: true if list is empty, false otherwise
60 int zfcp_reqlist_isempty(struct zfcp_adapter
*adapter
)
64 for (idx
= 0; idx
< REQUEST_LIST_SIZE
; idx
++)
65 if (!list_empty(&adapter
->req_list
[idx
]))
70 static int __init
zfcp_device_setup(char *devstr
)
78 /* duplicate devstr and keep the original for sysfs presentation*/
79 str
= kmalloc(strlen(devstr
) + 1, GFP_KERNEL
);
85 token
= strsep(&str
, ",");
86 if (!token
|| strlen(token
) >= BUS_ID_SIZE
)
88 strncpy(zfcp_data
.init_busid
, token
, BUS_ID_SIZE
);
90 token
= strsep(&str
, ",");
91 if (!token
|| strict_strtoull(token
, 0,
92 (unsigned long long *) &zfcp_data
.init_wwpn
))
95 token
= strsep(&str
, ",");
96 if (!token
|| strict_strtoull(token
, 0,
97 (unsigned long long *) &zfcp_data
.init_fcp_lun
))
105 pr_err("zfcp: %s is not a valid SCSI device\n", devstr
);
109 static void __init
zfcp_init_device_configure(void)
111 struct zfcp_adapter
*adapter
;
112 struct zfcp_port
*port
;
113 struct zfcp_unit
*unit
;
115 down(&zfcp_data
.config_sema
);
116 read_lock_irq(&zfcp_data
.config_lock
);
117 adapter
= zfcp_get_adapter_by_busid(zfcp_data
.init_busid
);
119 zfcp_adapter_get(adapter
);
120 read_unlock_irq(&zfcp_data
.config_lock
);
124 port
= zfcp_port_enqueue(adapter
, zfcp_data
.init_wwpn
, 0, 0);
127 unit
= zfcp_unit_enqueue(port
, zfcp_data
.init_fcp_lun
);
130 up(&zfcp_data
.config_sema
);
131 ccw_device_set_online(adapter
->ccw_device
);
133 zfcp_erp_wait(adapter
);
134 wait_event(adapter
->erp_done_wqh
,
135 !(atomic_read(&unit
->status
) &
136 ZFCP_STATUS_UNIT_SCSI_WORK_PENDING
));
138 down(&zfcp_data
.config_sema
);
143 zfcp_adapter_put(adapter
);
145 up(&zfcp_data
.config_sema
);
149 static struct kmem_cache
*zfcp_cache_create(int size
, char *name
)
152 while ((size
- align
) > 0)
154 return kmem_cache_create(name
, size
, align
, 0, NULL
);
157 static int __init
zfcp_module_init(void)
159 int retval
= -ENOMEM
;
161 zfcp_data
.fsf_req_qtcb_cache
= zfcp_cache_create(
162 sizeof(struct zfcp_fsf_req_qtcb
), "zfcp_fsf");
163 if (!zfcp_data
.fsf_req_qtcb_cache
)
166 zfcp_data
.sr_buffer_cache
= zfcp_cache_create(
167 sizeof(struct fsf_status_read_buffer
), "zfcp_sr");
168 if (!zfcp_data
.sr_buffer_cache
)
171 zfcp_data
.gid_pn_cache
= zfcp_cache_create(
172 sizeof(struct zfcp_gid_pn_data
), "zfcp_gid");
173 if (!zfcp_data
.gid_pn_cache
)
176 zfcp_data
.work_queue
= create_singlethread_workqueue("zfcp_wq");
178 INIT_LIST_HEAD(&zfcp_data
.adapter_list_head
);
179 sema_init(&zfcp_data
.config_sema
, 1);
180 rwlock_init(&zfcp_data
.config_lock
);
182 zfcp_data
.scsi_transport_template
=
183 fc_attach_transport(&zfcp_transport_functions
);
184 if (!zfcp_data
.scsi_transport_template
)
187 retval
= misc_register(&zfcp_cfdc_misc
);
189 pr_err("zfcp: Registering the misc device zfcp_cfdc failed\n");
193 retval
= zfcp_ccw_register();
195 pr_err("zfcp: The zfcp device driver could not register with "
196 "the common I/O layer\n");
197 goto out_ccw_register
;
200 if (zfcp_device_setup(device
))
201 zfcp_init_device_configure();
206 misc_deregister(&zfcp_cfdc_misc
);
208 fc_release_transport(zfcp_data
.scsi_transport_template
);
210 kmem_cache_destroy(zfcp_data
.gid_pn_cache
);
212 kmem_cache_destroy(zfcp_data
.sr_buffer_cache
);
214 kmem_cache_destroy(zfcp_data
.fsf_req_qtcb_cache
);
219 module_init(zfcp_module_init
);
222 * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
223 * @port: pointer to port to search for unit
224 * @fcp_lun: FCP LUN to search for
226 * Returns: pointer to zfcp_unit or NULL
228 struct zfcp_unit
*zfcp_get_unit_by_lun(struct zfcp_port
*port
, u64 fcp_lun
)
230 struct zfcp_unit
*unit
;
232 list_for_each_entry(unit
, &port
->unit_list_head
, list
)
233 if ((unit
->fcp_lun
== fcp_lun
) &&
234 !(atomic_read(&unit
->status
) & ZFCP_STATUS_COMMON_REMOVE
))
240 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
241 * @adapter: pointer to adapter to search for port
242 * @wwpn: wwpn to search for
244 * Returns: pointer to zfcp_port or NULL
246 struct zfcp_port
*zfcp_get_port_by_wwpn(struct zfcp_adapter
*adapter
,
249 struct zfcp_port
*port
;
251 list_for_each_entry(port
, &adapter
->port_list_head
, list
)
252 if ((port
->wwpn
== wwpn
) && !(atomic_read(&port
->status
) &
253 (ZFCP_STATUS_PORT_NO_WWPN
| ZFCP_STATUS_COMMON_REMOVE
)))
258 static void zfcp_sysfs_unit_release(struct device
*dev
)
260 kfree(container_of(dev
, struct zfcp_unit
, sysfs_device
));
264 * zfcp_unit_enqueue - enqueue unit to unit list of a port.
265 * @port: pointer to port where unit is added
266 * @fcp_lun: FCP LUN of unit to be enqueued
267 * Returns: pointer to enqueued unit on success, ERR_PTR on error
268 * Locks: config_sema must be held to serialize changes to the unit list
270 * Sets up some unit internal structures and creates sysfs entry.
272 struct zfcp_unit
*zfcp_unit_enqueue(struct zfcp_port
*port
, u64 fcp_lun
)
274 struct zfcp_unit
*unit
;
276 unit
= kzalloc(sizeof(struct zfcp_unit
), GFP_KERNEL
);
278 return ERR_PTR(-ENOMEM
);
280 atomic_set(&unit
->refcount
, 0);
281 init_waitqueue_head(&unit
->remove_wq
);
284 unit
->fcp_lun
= fcp_lun
;
286 dev_set_name(&unit
->sysfs_device
, "0x%016llx",
287 (unsigned long long) fcp_lun
);
288 unit
->sysfs_device
.parent
= &port
->sysfs_device
;
289 unit
->sysfs_device
.release
= zfcp_sysfs_unit_release
;
290 dev_set_drvdata(&unit
->sysfs_device
, unit
);
292 /* mark unit unusable as long as sysfs registration is not complete */
293 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE
, &unit
->status
);
295 spin_lock_init(&unit
->latencies
.lock
);
296 unit
->latencies
.write
.channel
.min
= 0xFFFFFFFF;
297 unit
->latencies
.write
.fabric
.min
= 0xFFFFFFFF;
298 unit
->latencies
.read
.channel
.min
= 0xFFFFFFFF;
299 unit
->latencies
.read
.fabric
.min
= 0xFFFFFFFF;
300 unit
->latencies
.cmd
.channel
.min
= 0xFFFFFFFF;
301 unit
->latencies
.cmd
.fabric
.min
= 0xFFFFFFFF;
303 read_lock_irq(&zfcp_data
.config_lock
);
304 if (zfcp_get_unit_by_lun(port
, fcp_lun
)) {
305 read_unlock_irq(&zfcp_data
.config_lock
);
308 read_unlock_irq(&zfcp_data
.config_lock
);
310 if (device_register(&unit
->sysfs_device
))
313 if (sysfs_create_group(&unit
->sysfs_device
.kobj
,
314 &zfcp_sysfs_unit_attrs
)) {
315 device_unregister(&unit
->sysfs_device
);
316 return ERR_PTR(-EIO
);
321 write_lock_irq(&zfcp_data
.config_lock
);
322 list_add_tail(&unit
->list
, &port
->unit_list_head
);
323 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE
, &unit
->status
);
324 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING
, &unit
->status
);
326 write_unlock_irq(&zfcp_data
.config_lock
);
334 return ERR_PTR(-EINVAL
);
338 * zfcp_unit_dequeue - dequeue unit
339 * @unit: pointer to zfcp_unit
341 * waits until all work is done on unit and removes it then from the unit->list
342 * of the associated port.
344 void zfcp_unit_dequeue(struct zfcp_unit
*unit
)
346 wait_event(unit
->remove_wq
, atomic_read(&unit
->refcount
) == 0);
347 write_lock_irq(&zfcp_data
.config_lock
);
348 list_del(&unit
->list
);
349 write_unlock_irq(&zfcp_data
.config_lock
);
350 zfcp_port_put(unit
->port
);
351 sysfs_remove_group(&unit
->sysfs_device
.kobj
, &zfcp_sysfs_unit_attrs
);
352 device_unregister(&unit
->sysfs_device
);
355 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter
*adapter
)
357 /* must only be called with zfcp_data.config_sema taken */
358 adapter
->pool
.fsf_req_erp
=
359 mempool_create_slab_pool(1, zfcp_data
.fsf_req_qtcb_cache
);
360 if (!adapter
->pool
.fsf_req_erp
)
363 adapter
->pool
.fsf_req_scsi
=
364 mempool_create_slab_pool(1, zfcp_data
.fsf_req_qtcb_cache
);
365 if (!adapter
->pool
.fsf_req_scsi
)
368 adapter
->pool
.fsf_req_abort
=
369 mempool_create_slab_pool(1, zfcp_data
.fsf_req_qtcb_cache
);
370 if (!adapter
->pool
.fsf_req_abort
)
373 adapter
->pool
.fsf_req_status_read
=
374 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM
,
375 sizeof(struct zfcp_fsf_req
));
376 if (!adapter
->pool
.fsf_req_status_read
)
379 adapter
->pool
.data_status_read
=
380 mempool_create_slab_pool(FSF_STATUS_READS_RECOM
,
381 zfcp_data
.sr_buffer_cache
);
382 if (!adapter
->pool
.data_status_read
)
385 adapter
->pool
.data_gid_pn
=
386 mempool_create_slab_pool(1, zfcp_data
.gid_pn_cache
);
387 if (!adapter
->pool
.data_gid_pn
)
393 static void zfcp_free_low_mem_buffers(struct zfcp_adapter
*adapter
)
395 /* zfcp_data.config_sema must be held */
396 if (adapter
->pool
.fsf_req_erp
)
397 mempool_destroy(adapter
->pool
.fsf_req_erp
);
398 if (adapter
->pool
.fsf_req_scsi
)
399 mempool_destroy(adapter
->pool
.fsf_req_scsi
);
400 if (adapter
->pool
.fsf_req_abort
)
401 mempool_destroy(adapter
->pool
.fsf_req_abort
);
402 if (adapter
->pool
.fsf_req_status_read
)
403 mempool_destroy(adapter
->pool
.fsf_req_status_read
);
404 if (adapter
->pool
.data_status_read
)
405 mempool_destroy(adapter
->pool
.data_status_read
);
406 if (adapter
->pool
.data_gid_pn
)
407 mempool_destroy(adapter
->pool
.data_gid_pn
);
411 * zfcp_status_read_refill - refill the long running status_read_requests
412 * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
414 * Returns: 0 on success, 1 otherwise
416 * if there are 16 or more status_read requests missing an adapter_reopen
419 int zfcp_status_read_refill(struct zfcp_adapter
*adapter
)
421 while (atomic_read(&adapter
->stat_miss
) > 0)
422 if (zfcp_fsf_status_read(adapter
)) {
423 if (atomic_read(&adapter
->stat_miss
) >= 16) {
424 zfcp_erp_adapter_reopen(adapter
, 0, 103, NULL
);
429 atomic_dec(&adapter
->stat_miss
);
433 static void _zfcp_status_read_scheduler(struct work_struct
*work
)
435 zfcp_status_read_refill(container_of(work
, struct zfcp_adapter
,
440 * zfcp_adapter_enqueue - enqueue a new adapter to the list
441 * @ccw_device: pointer to the struct cc_device
443 * Returns: 0 if a new adapter was successfully enqueued
444 * -ENOMEM if alloc failed
445 * Enqueues an adapter at the end of the adapter list in the driver data.
446 * All adapter internal structures are set up.
447 * Proc-fs entries are also created.
448 * locks: config_sema must be held to serialise changes to the adapter list
450 int zfcp_adapter_enqueue(struct ccw_device
*ccw_device
)
452 struct zfcp_adapter
*adapter
;
455 * Note: It is safe to release the list_lock, as any list changes
456 * are protected by the config_sema, which must be held to get here
459 adapter
= kzalloc(sizeof(struct zfcp_adapter
), GFP_KERNEL
);
463 ccw_device
->handler
= NULL
;
464 adapter
->ccw_device
= ccw_device
;
465 atomic_set(&adapter
->refcount
, 0);
467 if (zfcp_qdio_allocate(adapter
))
468 goto qdio_allocate_failed
;
470 if (zfcp_allocate_low_mem_buffers(adapter
))
471 goto failed_low_mem_buffers
;
473 if (zfcp_reqlist_alloc(adapter
))
474 goto failed_low_mem_buffers
;
476 if (zfcp_adapter_debug_register(adapter
))
477 goto debug_register_failed
;
479 init_waitqueue_head(&adapter
->remove_wq
);
480 init_waitqueue_head(&adapter
->erp_thread_wqh
);
481 init_waitqueue_head(&adapter
->erp_done_wqh
);
483 INIT_LIST_HEAD(&adapter
->port_list_head
);
484 INIT_LIST_HEAD(&adapter
->erp_ready_head
);
485 INIT_LIST_HEAD(&adapter
->erp_running_head
);
487 spin_lock_init(&adapter
->req_list_lock
);
489 spin_lock_init(&adapter
->hba_dbf_lock
);
490 spin_lock_init(&adapter
->san_dbf_lock
);
491 spin_lock_init(&adapter
->scsi_dbf_lock
);
492 spin_lock_init(&adapter
->rec_dbf_lock
);
493 spin_lock_init(&adapter
->req_q_lock
);
495 rwlock_init(&adapter
->erp_lock
);
496 rwlock_init(&adapter
->abort_lock
);
498 sema_init(&adapter
->erp_ready_sem
, 0);
500 INIT_WORK(&adapter
->stat_work
, _zfcp_status_read_scheduler
);
501 INIT_WORK(&adapter
->scan_work
, _zfcp_scan_ports_later
);
503 /* mark adapter unusable as long as sysfs registration is not complete */
504 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE
, &adapter
->status
);
506 dev_set_drvdata(&ccw_device
->dev
, adapter
);
508 if (sysfs_create_group(&ccw_device
->dev
.kobj
,
509 &zfcp_sysfs_adapter_attrs
))
512 write_lock_irq(&zfcp_data
.config_lock
);
513 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE
, &adapter
->status
);
514 list_add_tail(&adapter
->list
, &zfcp_data
.adapter_list_head
);
515 write_unlock_irq(&zfcp_data
.config_lock
);
517 zfcp_fc_nameserver_init(adapter
);
522 zfcp_adapter_debug_unregister(adapter
);
523 debug_register_failed
:
524 dev_set_drvdata(&ccw_device
->dev
, NULL
);
525 kfree(adapter
->req_list
);
526 failed_low_mem_buffers
:
527 zfcp_free_low_mem_buffers(adapter
);
528 qdio_allocate_failed
:
529 zfcp_qdio_free(adapter
);
535 * zfcp_adapter_dequeue - remove the adapter from the resource list
536 * @adapter: pointer to struct zfcp_adapter which should be removed
537 * locks: adapter list write lock is assumed to be held by caller
539 void zfcp_adapter_dequeue(struct zfcp_adapter
*adapter
)
544 cancel_work_sync(&adapter
->scan_work
);
545 cancel_work_sync(&adapter
->stat_work
);
546 zfcp_adapter_scsi_unregister(adapter
);
547 sysfs_remove_group(&adapter
->ccw_device
->dev
.kobj
,
548 &zfcp_sysfs_adapter_attrs
);
549 dev_set_drvdata(&adapter
->ccw_device
->dev
, NULL
);
550 /* sanity check: no pending FSF requests */
551 spin_lock_irqsave(&adapter
->req_list_lock
, flags
);
552 retval
= zfcp_reqlist_isempty(adapter
);
553 spin_unlock_irqrestore(&adapter
->req_list_lock
, flags
);
557 zfcp_adapter_debug_unregister(adapter
);
559 /* remove specified adapter data structure from list */
560 write_lock_irq(&zfcp_data
.config_lock
);
561 list_del(&adapter
->list
);
562 write_unlock_irq(&zfcp_data
.config_lock
);
564 zfcp_qdio_free(adapter
);
566 zfcp_free_low_mem_buffers(adapter
);
567 kfree(adapter
->req_list
);
568 kfree(adapter
->fc_stats
);
569 kfree(adapter
->stats_reset_data
);
573 static void zfcp_sysfs_port_release(struct device
*dev
)
575 kfree(container_of(dev
, struct zfcp_port
, sysfs_device
));
579 * zfcp_port_enqueue - enqueue port to port list of adapter
580 * @adapter: adapter where remote port is added
581 * @wwpn: WWPN of the remote port to be enqueued
582 * @status: initial status for the port
583 * @d_id: destination id of the remote port to be enqueued
584 * Returns: pointer to enqueued port on success, ERR_PTR on error
585 * Locks: config_sema must be held to serialize changes to the port list
587 * All port internal structures are set up and the sysfs entry is generated.
588 * d_id is used to enqueue ports with a well known address like the Directory
589 * Service for nameserver lookup.
591 struct zfcp_port
*zfcp_port_enqueue(struct zfcp_adapter
*adapter
, u64 wwpn
,
592 u32 status
, u32 d_id
)
594 struct zfcp_port
*port
;
597 port
= kzalloc(sizeof(struct zfcp_port
), GFP_KERNEL
);
599 return ERR_PTR(-ENOMEM
);
601 init_waitqueue_head(&port
->remove_wq
);
602 INIT_LIST_HEAD(&port
->unit_list_head
);
603 INIT_WORK(&port
->gid_pn_work
, zfcp_erp_port_strategy_open_lookup
);
605 port
->adapter
= adapter
;
609 /* mark port unusable as long as sysfs registration is not complete */
610 atomic_set_mask(status
| ZFCP_STATUS_COMMON_REMOVE
, &port
->status
);
611 atomic_set(&port
->refcount
, 0);
613 dev_set_name(&port
->sysfs_device
, "0x%016llx", wwpn
);
614 port
->sysfs_device
.parent
= &adapter
->ccw_device
->dev
;
616 port
->sysfs_device
.release
= zfcp_sysfs_port_release
;
617 dev_set_drvdata(&port
->sysfs_device
, port
);
619 read_lock_irq(&zfcp_data
.config_lock
);
620 if (!(status
& ZFCP_STATUS_PORT_NO_WWPN
))
621 if (zfcp_get_port_by_wwpn(adapter
, wwpn
)) {
622 read_unlock_irq(&zfcp_data
.config_lock
);
625 read_unlock_irq(&zfcp_data
.config_lock
);
627 if (device_register(&port
->sysfs_device
))
630 retval
= sysfs_create_group(&port
->sysfs_device
.kobj
,
631 &zfcp_sysfs_port_attrs
);
634 device_unregister(&port
->sysfs_device
);
640 write_lock_irq(&zfcp_data
.config_lock
);
641 list_add_tail(&port
->list
, &adapter
->port_list_head
);
642 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE
, &port
->status
);
643 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING
, &port
->status
);
645 write_unlock_irq(&zfcp_data
.config_lock
);
647 zfcp_adapter_get(adapter
);
653 return ERR_PTR(-EINVAL
);
657 * zfcp_port_dequeue - dequeues a port from the port list of the adapter
658 * @port: pointer to struct zfcp_port which should be removed
660 void zfcp_port_dequeue(struct zfcp_port
*port
)
662 wait_event(port
->remove_wq
, atomic_read(&port
->refcount
) == 0);
663 write_lock_irq(&zfcp_data
.config_lock
);
664 list_del(&port
->list
);
665 write_unlock_irq(&zfcp_data
.config_lock
);
667 fc_remote_port_delete(port
->rport
);
669 zfcp_adapter_put(port
->adapter
);
670 sysfs_remove_group(&port
->sysfs_device
.kobj
, &zfcp_sysfs_port_attrs
);
671 device_unregister(&port
->sysfs_device
);
675 * zfcp_sg_free_table - free memory used by scatterlists
676 * @sg: pointer to scatterlist
677 * @count: number of scatterlist which are to be free'ed
678 * the scatterlist are expected to reference pages always
680 void zfcp_sg_free_table(struct scatterlist
*sg
, int count
)
684 for (i
= 0; i
< count
; i
++, sg
++)
686 free_page((unsigned long) sg_virt(sg
));
692 * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers
693 * @sg: pointer to struct scatterlist
694 * @count: number of scatterlists which should be assigned with buffers
697 * Returns: 0 on success, -ENOMEM otherwise
699 int zfcp_sg_setup_table(struct scatterlist
*sg
, int count
)
704 sg_init_table(sg
, count
);
705 for (i
= 0; i
< count
; i
++, sg
++) {
706 addr
= (void *) get_zeroed_page(GFP_KERNEL
);
708 zfcp_sg_free_table(sg
, i
);
711 sg_set_buf(sg
, addr
, PAGE_SIZE
);