Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
553448f6 | 2 | * zfcp device driver |
1da177e4 | 3 | * |
553448f6 | 4 | * Module interface and handling of zfcp data structures. |
1da177e4 | 5 | * |
553448f6 | 6 | * Copyright IBM Corporation 2002, 2008 |
1da177e4 LT |
7 | */ |
8 | ||
4a9d2d8b AH |
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 | |
553448f6 CS |
21 | * Michael Loehr |
22 | * Swen Schillig | |
23 | * Christof Schmitt | |
24 | * Martin Petermann | |
25 | * Sven Schuetz | |
4a9d2d8b AH |
26 | */ |
27 | ||
45633fdc | 28 | #include <linux/miscdevice.h> |
1da177e4 LT |
29 | #include "zfcp_ext.h" |
30 | ||
1da177e4 | 31 | static char *device; |
1da177e4 | 32 | |
4a9d2d8b | 33 | MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com"); |
317e6b65 | 34 | MODULE_DESCRIPTION("FCP HBA driver"); |
1da177e4 LT |
35 | MODULE_LICENSE("GPL"); |
36 | ||
6f71d9bc | 37 | module_param(device, charp, 0400); |
1da177e4 LT |
38 | MODULE_PARM_DESC(device, "specify initial device"); |
39 | ||
ca2d02c2 | 40 | static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter) |
fea9d6c7 | 41 | { |
ca2d02c2 | 42 | int idx; |
fea9d6c7 VS |
43 | |
44 | adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head), | |
45 | GFP_KERNEL); | |
fea9d6c7 VS |
46 | if (!adapter->req_list) |
47 | return -ENOMEM; | |
48 | ||
ca2d02c2 HC |
49 | for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) |
50 | INIT_LIST_HEAD(&adapter->req_list[idx]); | |
fea9d6c7 VS |
51 | return 0; |
52 | } | |
53 | ||
317e6b65 SS |
54 | /** |
55 | * zfcp_reqlist_isempty - is the request list empty | |
56 | * @adapter: pointer to struct zfcp_adapter | |
57 | * | |
58 | * Returns: true if list is empty, false otherwise | |
59 | */ | |
fea9d6c7 VS |
60 | int zfcp_reqlist_isempty(struct zfcp_adapter *adapter) |
61 | { | |
ca2d02c2 | 62 | unsigned int idx; |
fea9d6c7 | 63 | |
ca2d02c2 HC |
64 | for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) |
65 | if (!list_empty(&adapter->req_list[idx])) | |
fea9d6c7 | 66 | return 0; |
fea9d6c7 VS |
67 | return 1; |
68 | } | |
69 | ||
317e6b65 | 70 | static int __init zfcp_device_setup(char *devstr) |
1da177e4 | 71 | { |
317e6b65 SS |
72 | char *token; |
73 | char *str; | |
1da177e4 | 74 | |
cd8a383e | 75 | if (!devstr) |
1da177e4 LT |
76 | return 0; |
77 | ||
317e6b65 SS |
78 | /* duplicate devstr and keep the original for sysfs presentation*/ |
79 | str = kmalloc(strlen(devstr) + 1, GFP_KERNEL); | |
80 | if (!str) | |
553448f6 | 81 | return 0; |
cd8a383e | 82 | |
317e6b65 | 83 | strcpy(str, devstr); |
1da177e4 | 84 | |
317e6b65 SS |
85 | token = strsep(&str, ","); |
86 | if (!token || strlen(token) >= BUS_ID_SIZE) | |
1da177e4 | 87 | goto err_out; |
317e6b65 SS |
88 | strncpy(zfcp_data.init_busid, token, BUS_ID_SIZE); |
89 | ||
90 | token = strsep(&str, ","); | |
7ba58c9c SS |
91 | if (!token || strict_strtoull(token, 0, |
92 | (unsigned long long *) &zfcp_data.init_wwpn)) | |
1da177e4 LT |
93 | goto err_out; |
94 | ||
317e6b65 | 95 | token = strsep(&str, ","); |
7ba58c9c SS |
96 | if (!token || strict_strtoull(token, 0, |
97 | (unsigned long long *) &zfcp_data.init_fcp_lun)) | |
1da177e4 | 98 | goto err_out; |
317e6b65 | 99 | |
cd8a383e | 100 | kfree(str); |
1da177e4 LT |
101 | return 1; |
102 | ||
103 | err_out: | |
cd8a383e | 104 | kfree(str); |
ff3b24fa | 105 | pr_err("zfcp: %s is not a valid SCSI device\n", devstr); |
1da177e4 LT |
106 | return 0; |
107 | } | |
108 | ||
317e6b65 | 109 | static void __init zfcp_init_device_configure(void) |
1da177e4 LT |
110 | { |
111 | struct zfcp_adapter *adapter; | |
112 | struct zfcp_port *port; | |
113 | struct zfcp_unit *unit; | |
114 | ||
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); | |
118 | if (adapter) | |
119 | zfcp_adapter_get(adapter); | |
120 | read_unlock_irq(&zfcp_data.config_lock); | |
121 | ||
317e6b65 | 122 | if (!adapter) |
1da177e4 LT |
123 | goto out_adapter; |
124 | port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0); | |
317e6b65 | 125 | if (IS_ERR(port)) |
1da177e4 LT |
126 | goto out_port; |
127 | unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun); | |
317e6b65 | 128 | if (IS_ERR(unit)) |
1da177e4 LT |
129 | goto out_unit; |
130 | up(&zfcp_data.config_sema); | |
131 | ccw_device_set_online(adapter->ccw_device); | |
091694a5 | 132 | |
1da177e4 | 133 | zfcp_erp_wait(adapter); |
091694a5 SS |
134 | wait_event(adapter->erp_done_wqh, |
135 | !(atomic_read(&unit->status) & | |
136 | ZFCP_STATUS_UNIT_SCSI_WORK_PENDING)); | |
137 | ||
1da177e4 LT |
138 | down(&zfcp_data.config_sema); |
139 | zfcp_unit_put(unit); | |
317e6b65 | 140 | out_unit: |
1da177e4 | 141 | zfcp_port_put(port); |
317e6b65 | 142 | out_port: |
1da177e4 | 143 | zfcp_adapter_put(adapter); |
317e6b65 | 144 | out_adapter: |
1da177e4 LT |
145 | up(&zfcp_data.config_sema); |
146 | return; | |
147 | } | |
148 | ||
317e6b65 | 149 | static struct kmem_cache *zfcp_cache_create(int size, char *name) |
dd52e0ea HC |
150 | { |
151 | int align = 1; | |
dd52e0ea HC |
152 | while ((size - align) > 0) |
153 | align <<= 1; | |
317e6b65 | 154 | return kmem_cache_create(name , size, align, 0, NULL); |
dd52e0ea HC |
155 | } |
156 | ||
317e6b65 | 157 | static int __init zfcp_module_init(void) |
1da177e4 | 158 | { |
dd52e0ea | 159 | int retval = -ENOMEM; |
dd52e0ea | 160 | |
317e6b65 SS |
161 | zfcp_data.fsf_req_qtcb_cache = zfcp_cache_create( |
162 | sizeof(struct zfcp_fsf_req_qtcb), "zfcp_fsf"); | |
dd52e0ea HC |
163 | if (!zfcp_data.fsf_req_qtcb_cache) |
164 | goto out; | |
1da177e4 | 165 | |
317e6b65 SS |
166 | zfcp_data.sr_buffer_cache = zfcp_cache_create( |
167 | sizeof(struct fsf_status_read_buffer), "zfcp_sr"); | |
dd52e0ea HC |
168 | if (!zfcp_data.sr_buffer_cache) |
169 | goto out_sr_cache; | |
170 | ||
317e6b65 SS |
171 | zfcp_data.gid_pn_cache = zfcp_cache_create( |
172 | sizeof(struct zfcp_gid_pn_data), "zfcp_gid"); | |
dd52e0ea HC |
173 | if (!zfcp_data.gid_pn_cache) |
174 | goto out_gid_cache; | |
1da177e4 | 175 | |
b7f15f3c SS |
176 | zfcp_data.work_queue = create_singlethread_workqueue("zfcp_wq"); |
177 | ||
1da177e4 | 178 | INIT_LIST_HEAD(&zfcp_data.adapter_list_head); |
317e6b65 SS |
179 | sema_init(&zfcp_data.config_sema, 1); |
180 | rwlock_init(&zfcp_data.config_lock); | |
181 | ||
dd52e0ea HC |
182 | zfcp_data.scsi_transport_template = |
183 | fc_attach_transport(&zfcp_transport_functions); | |
184 | if (!zfcp_data.scsi_transport_template) | |
185 | goto out_transport; | |
1da177e4 | 186 | |
1da177e4 | 187 | retval = misc_register(&zfcp_cfdc_misc); |
317e6b65 | 188 | if (retval) { |
ff3b24fa | 189 | pr_err("zfcp: Registering the misc device zfcp_cfdc failed\n"); |
dd52e0ea | 190 | goto out_misc; |
1da177e4 LT |
191 | } |
192 | ||
1da177e4 LT |
193 | retval = zfcp_ccw_register(); |
194 | if (retval) { | |
ff3b24fa CS |
195 | pr_err("zfcp: The zfcp device driver could not register with " |
196 | "the common I/O layer\n"); | |
1da177e4 LT |
197 | goto out_ccw_register; |
198 | } | |
199 | ||
200 | if (zfcp_device_setup(device)) | |
201 | zfcp_init_device_configure(); | |
202 | ||
203 | goto out; | |
204 | ||
317e6b65 | 205 | out_ccw_register: |
1da177e4 | 206 | misc_deregister(&zfcp_cfdc_misc); |
317e6b65 | 207 | out_misc: |
dd52e0ea | 208 | fc_release_transport(zfcp_data.scsi_transport_template); |
317e6b65 | 209 | out_transport: |
dd52e0ea | 210 | kmem_cache_destroy(zfcp_data.gid_pn_cache); |
317e6b65 | 211 | out_gid_cache: |
dd52e0ea | 212 | kmem_cache_destroy(zfcp_data.sr_buffer_cache); |
317e6b65 | 213 | out_sr_cache: |
dd52e0ea | 214 | kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache); |
317e6b65 | 215 | out: |
1da177e4 LT |
216 | return retval; |
217 | } | |
218 | ||
317e6b65 | 219 | module_init(zfcp_module_init); |
1da177e4 | 220 | |
1da177e4 LT |
221 | /** |
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 | |
317e6b65 SS |
225 | * |
226 | * Returns: pointer to zfcp_unit or NULL | |
1da177e4 | 227 | */ |
7ba58c9c | 228 | struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *port, u64 fcp_lun) |
1da177e4 LT |
229 | { |
230 | struct zfcp_unit *unit; | |
1da177e4 | 231 | |
317e6b65 | 232 | list_for_each_entry(unit, &port->unit_list_head, list) |
1da177e4 | 233 | if ((unit->fcp_lun == fcp_lun) && |
317e6b65 SS |
234 | !(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_REMOVE)) |
235 | return unit; | |
236 | return NULL; | |
1da177e4 LT |
237 | } |
238 | ||
239 | /** | |
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 | |
317e6b65 SS |
243 | * |
244 | * Returns: pointer to zfcp_port or NULL | |
1da177e4 | 245 | */ |
317e6b65 | 246 | struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, |
7ba58c9c | 247 | u64 wwpn) |
1da177e4 LT |
248 | { |
249 | struct zfcp_port *port; | |
1da177e4 | 250 | |
317e6b65 SS |
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))) | |
254 | return port; | |
255 | return NULL; | |
1da177e4 LT |
256 | } |
257 | ||
60221920 SS |
258 | static void zfcp_sysfs_unit_release(struct device *dev) |
259 | { | |
260 | kfree(container_of(dev, struct zfcp_unit, sysfs_device)); | |
261 | } | |
262 | ||
1da177e4 LT |
263 | /** |
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 | |
317e6b65 | 267 | * Returns: pointer to enqueued unit on success, ERR_PTR on error |
1da177e4 LT |
268 | * Locks: config_sema must be held to serialize changes to the unit list |
269 | * | |
270 | * Sets up some unit internal structures and creates sysfs entry. | |
271 | */ | |
7ba58c9c | 272 | struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, u64 fcp_lun) |
1da177e4 | 273 | { |
462b7859 | 274 | struct zfcp_unit *unit; |
1da177e4 | 275 | |
317e6b65 | 276 | unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL); |
1da177e4 | 277 | if (!unit) |
317e6b65 | 278 | return ERR_PTR(-ENOMEM); |
1da177e4 | 279 | |
1da177e4 LT |
280 | atomic_set(&unit->refcount, 0); |
281 | init_waitqueue_head(&unit->remove_wq); | |
282 | ||
283 | unit->port = port; | |
284 | unit->fcp_lun = fcp_lun; | |
285 | ||
1bf5b285 CH |
286 | dev_set_name(&unit->sysfs_device, "0x%016llx", |
287 | (unsigned long long) fcp_lun); | |
1da177e4 LT |
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); | |
291 | ||
292 | /* mark unit unusable as long as sysfs registration is not complete */ | |
293 | atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status); | |
294 | ||
c9615858 CS |
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; | |
302 | ||
317e6b65 SS |
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); | |
306 | goto err_out_free; | |
1da177e4 | 307 | } |
317e6b65 SS |
308 | read_unlock_irq(&zfcp_data.config_lock); |
309 | ||
310 | if (device_register(&unit->sysfs_device)) | |
311 | goto err_out_free; | |
1da177e4 | 312 | |
60221920 SS |
313 | if (sysfs_create_group(&unit->sysfs_device.kobj, |
314 | &zfcp_sysfs_unit_attrs)) { | |
1da177e4 | 315 | device_unregister(&unit->sysfs_device); |
317e6b65 | 316 | return ERR_PTR(-EIO); |
1da177e4 LT |
317 | } |
318 | ||
319 | zfcp_unit_get(unit); | |
320 | ||
1da177e4 | 321 | write_lock_irq(&zfcp_data.config_lock); |
462b7859 | 322 | list_add_tail(&unit->list, &port->unit_list_head); |
1da177e4 LT |
323 | atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status); |
324 | atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status); | |
317e6b65 | 325 | |
1da177e4 LT |
326 | write_unlock_irq(&zfcp_data.config_lock); |
327 | ||
1da177e4 LT |
328 | zfcp_port_get(port); |
329 | ||
330 | return unit; | |
317e6b65 SS |
331 | |
332 | err_out_free: | |
333 | kfree(unit); | |
334 | return ERR_PTR(-EINVAL); | |
1da177e4 LT |
335 | } |
336 | ||
317e6b65 SS |
337 | /** |
338 | * zfcp_unit_dequeue - dequeue unit | |
339 | * @unit: pointer to zfcp_unit | |
340 | * | |
341 | * waits until all work is done on unit and removes it then from the unit->list | |
342 | * of the associated port. | |
343 | */ | |
344 | void zfcp_unit_dequeue(struct zfcp_unit *unit) | |
1da177e4 | 345 | { |
44cc76f2 | 346 | wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0); |
1da177e4 LT |
347 | write_lock_irq(&zfcp_data.config_lock); |
348 | list_del(&unit->list); | |
349 | write_unlock_irq(&zfcp_data.config_lock); | |
1da177e4 | 350 | zfcp_port_put(unit->port); |
60221920 | 351 | sysfs_remove_group(&unit->sysfs_device.kobj, &zfcp_sysfs_unit_attrs); |
1da177e4 LT |
352 | device_unregister(&unit->sysfs_device); |
353 | } | |
354 | ||
317e6b65 | 355 | static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter) |
1da177e4 | 356 | { |
317e6b65 | 357 | /* must only be called with zfcp_data.config_sema taken */ |
1da177e4 | 358 | adapter->pool.fsf_req_erp = |
317e6b65 | 359 | mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache); |
0eaae62a | 360 | if (!adapter->pool.fsf_req_erp) |
1da177e4 LT |
361 | return -ENOMEM; |
362 | ||
363 | adapter->pool.fsf_req_scsi = | |
317e6b65 | 364 | mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache); |
0eaae62a | 365 | if (!adapter->pool.fsf_req_scsi) |
1da177e4 LT |
366 | return -ENOMEM; |
367 | ||
368 | adapter->pool.fsf_req_abort = | |
317e6b65 | 369 | mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache); |
0eaae62a | 370 | if (!adapter->pool.fsf_req_abort) |
1da177e4 LT |
371 | return -ENOMEM; |
372 | ||
373 | adapter->pool.fsf_req_status_read = | |
317e6b65 | 374 | mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM, |
0eaae62a MD |
375 | sizeof(struct zfcp_fsf_req)); |
376 | if (!adapter->pool.fsf_req_status_read) | |
1da177e4 LT |
377 | return -ENOMEM; |
378 | ||
379 | adapter->pool.data_status_read = | |
317e6b65 | 380 | mempool_create_slab_pool(FSF_STATUS_READS_RECOM, |
dd52e0ea | 381 | zfcp_data.sr_buffer_cache); |
0eaae62a | 382 | if (!adapter->pool.data_status_read) |
1da177e4 LT |
383 | return -ENOMEM; |
384 | ||
385 | adapter->pool.data_gid_pn = | |
317e6b65 | 386 | mempool_create_slab_pool(1, zfcp_data.gid_pn_cache); |
0eaae62a | 387 | if (!adapter->pool.data_gid_pn) |
1da177e4 LT |
388 | return -ENOMEM; |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
317e6b65 | 393 | static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter) |
1da177e4 | 394 | { |
317e6b65 | 395 | /* zfcp_data.config_sema must be held */ |
1da177e4 LT |
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); | |
408 | } | |
409 | ||
317e6b65 SS |
410 | /** |
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 | |
413 | * | |
414 | * Returns: 0 on success, 1 otherwise | |
415 | * | |
416 | * if there are 16 or more status_read requests missing an adapter_reopen | |
417 | * is triggered | |
418 | */ | |
d26ab06e SS |
419 | int zfcp_status_read_refill(struct zfcp_adapter *adapter) |
420 | { | |
421 | while (atomic_read(&adapter->stat_miss) > 0) | |
c41f8cbd | 422 | if (zfcp_fsf_status_read(adapter)) { |
7afe29f7 SS |
423 | if (atomic_read(&adapter->stat_miss) >= 16) { |
424 | zfcp_erp_adapter_reopen(adapter, 0, 103, NULL); | |
425 | return 1; | |
426 | } | |
d26ab06e | 427 | break; |
7afe29f7 SS |
428 | } else |
429 | atomic_dec(&adapter->stat_miss); | |
d26ab06e SS |
430 | return 0; |
431 | } | |
432 | ||
433 | static void _zfcp_status_read_scheduler(struct work_struct *work) | |
434 | { | |
435 | zfcp_status_read_refill(container_of(work, struct zfcp_adapter, | |
436 | stat_work)); | |
437 | } | |
438 | ||
317e6b65 SS |
439 | /** |
440 | * zfcp_adapter_enqueue - enqueue a new adapter to the list | |
441 | * @ccw_device: pointer to the struct cc_device | |
442 | * | |
443 | * Returns: 0 if a new adapter was successfully enqueued | |
444 | * -ENOMEM if alloc failed | |
1da177e4 LT |
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. | |
1da177e4 LT |
448 | * locks: config_sema must be held to serialise changes to the adapter list |
449 | */ | |
317e6b65 | 450 | int zfcp_adapter_enqueue(struct ccw_device *ccw_device) |
1da177e4 | 451 | { |
1da177e4 LT |
452 | struct zfcp_adapter *adapter; |
453 | ||
454 | /* | |
41fa2ada | 455 | * Note: It is safe to release the list_lock, as any list changes |
1da177e4 LT |
456 | * are protected by the config_sema, which must be held to get here |
457 | */ | |
458 | ||
317e6b65 | 459 | adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL); |
553448f6 | 460 | if (!adapter) |
317e6b65 | 461 | return -ENOMEM; |
1da177e4 LT |
462 | |
463 | ccw_device->handler = NULL; | |
1da177e4 | 464 | adapter->ccw_device = ccw_device; |
317e6b65 | 465 | atomic_set(&adapter->refcount, 0); |
1da177e4 | 466 | |
00bab910 | 467 | if (zfcp_qdio_allocate(adapter)) |
1da177e4 LT |
468 | goto qdio_allocate_failed; |
469 | ||
00bab910 | 470 | if (zfcp_allocate_low_mem_buffers(adapter)) |
1da177e4 | 471 | goto failed_low_mem_buffers; |
1da177e4 | 472 | |
317e6b65 SS |
473 | if (zfcp_reqlist_alloc(adapter)) |
474 | goto failed_low_mem_buffers; | |
475 | ||
476 | if (zfcp_adapter_debug_register(adapter)) | |
477 | goto debug_register_failed; | |
478 | ||
1da177e4 | 479 | init_waitqueue_head(&adapter->remove_wq); |
317e6b65 SS |
480 | init_waitqueue_head(&adapter->erp_thread_wqh); |
481 | init_waitqueue_head(&adapter->erp_done_wqh); | |
1da177e4 | 482 | |
1da177e4 | 483 | INIT_LIST_HEAD(&adapter->port_list_head); |
317e6b65 SS |
484 | INIT_LIST_HEAD(&adapter->erp_ready_head); |
485 | INIT_LIST_HEAD(&adapter->erp_running_head); | |
1da177e4 | 486 | |
fea9d6c7 | 487 | spin_lock_init(&adapter->req_list_lock); |
c48a29d0 | 488 | |
c48a29d0 HC |
489 | spin_lock_init(&adapter->hba_dbf_lock); |
490 | spin_lock_init(&adapter->san_dbf_lock); | |
491 | spin_lock_init(&adapter->scsi_dbf_lock); | |
d79a83db | 492 | spin_lock_init(&adapter->rec_dbf_lock); |
0406289e | 493 | spin_lock_init(&adapter->req_q_lock); |
c48a29d0 | 494 | |
c48a29d0 | 495 | rwlock_init(&adapter->erp_lock); |
1da177e4 LT |
496 | rwlock_init(&adapter->abort_lock); |
497 | ||
317e6b65 | 498 | sema_init(&adapter->erp_ready_sem, 0); |
1da177e4 | 499 | |
d26ab06e | 500 | INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler); |
cc8c2829 | 501 | INIT_WORK(&adapter->scan_work, _zfcp_scan_ports_later); |
1da177e4 | 502 | |
1da177e4 LT |
503 | /* mark adapter unusable as long as sysfs registration is not complete */ |
504 | atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status); | |
505 | ||
1da177e4 LT |
506 | dev_set_drvdata(&ccw_device->dev, adapter); |
507 | ||
60221920 SS |
508 | if (sysfs_create_group(&ccw_device->dev.kobj, |
509 | &zfcp_sysfs_adapter_attrs)) | |
1da177e4 LT |
510 | goto sysfs_failed; |
511 | ||
1da177e4 LT |
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); | |
516 | ||
5ab944f9 | 517 | zfcp_fc_nameserver_init(adapter); |
cc8c2829 | 518 | |
317e6b65 | 519 | return 0; |
1da177e4 | 520 | |
317e6b65 | 521 | sysfs_failed: |
ff17a29d | 522 | zfcp_adapter_debug_unregister(adapter); |
317e6b65 | 523 | debug_register_failed: |
1da177e4 | 524 | dev_set_drvdata(&ccw_device->dev, NULL); |
317e6b65 SS |
525 | kfree(adapter->req_list); |
526 | failed_low_mem_buffers: | |
1da177e4 | 527 | zfcp_free_low_mem_buffers(adapter); |
317e6b65 | 528 | qdio_allocate_failed: |
00bab910 | 529 | zfcp_qdio_free(adapter); |
1da177e4 | 530 | kfree(adapter); |
317e6b65 | 531 | return -ENOMEM; |
1da177e4 LT |
532 | } |
533 | ||
317e6b65 SS |
534 | /** |
535 | * zfcp_adapter_dequeue - remove the adapter from the resource list | |
536 | * @adapter: pointer to struct zfcp_adapter which should be removed | |
1da177e4 | 537 | * locks: adapter list write lock is assumed to be held by caller |
1da177e4 | 538 | */ |
317e6b65 | 539 | void zfcp_adapter_dequeue(struct zfcp_adapter *adapter) |
1da177e4 LT |
540 | { |
541 | int retval = 0; | |
542 | unsigned long flags; | |
543 | ||
cc8c2829 | 544 | cancel_work_sync(&adapter->scan_work); |
d26ab06e | 545 | cancel_work_sync(&adapter->stat_work); |
9f28745a | 546 | zfcp_adapter_scsi_unregister(adapter); |
60221920 SS |
547 | sysfs_remove_group(&adapter->ccw_device->dev.kobj, |
548 | &zfcp_sysfs_adapter_attrs); | |
1da177e4 LT |
549 | dev_set_drvdata(&adapter->ccw_device->dev, NULL); |
550 | /* sanity check: no pending FSF requests */ | |
fea9d6c7 VS |
551 | spin_lock_irqsave(&adapter->req_list_lock, flags); |
552 | retval = zfcp_reqlist_isempty(adapter); | |
553 | spin_unlock_irqrestore(&adapter->req_list_lock, flags); | |
317e6b65 SS |
554 | if (!retval) |
555 | return; | |
1da177e4 | 556 | |
ff17a29d CS |
557 | zfcp_adapter_debug_unregister(adapter); |
558 | ||
1da177e4 LT |
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); | |
563 | ||
00bab910 | 564 | zfcp_qdio_free(adapter); |
1da177e4 LT |
565 | |
566 | zfcp_free_low_mem_buffers(adapter); | |
317e6b65 | 567 | kfree(adapter->req_list); |
f6cd94b1 AH |
568 | kfree(adapter->fc_stats); |
569 | kfree(adapter->stats_reset_data); | |
1da177e4 | 570 | kfree(adapter); |
1da177e4 LT |
571 | } |
572 | ||
60221920 SS |
573 | static void zfcp_sysfs_port_release(struct device *dev) |
574 | { | |
575 | kfree(container_of(dev, struct zfcp_port, sysfs_device)); | |
576 | } | |
577 | ||
1da177e4 LT |
578 | /** |
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 | |
317e6b65 | 584 | * Returns: pointer to enqueued port on success, ERR_PTR on error |
1da177e4 LT |
585 | * Locks: config_sema must be held to serialize changes to the port list |
586 | * | |
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. | |
590 | */ | |
7ba58c9c | 591 | struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn, |
317e6b65 | 592 | u32 status, u32 d_id) |
1da177e4 | 593 | { |
3859f6a2 | 594 | struct zfcp_port *port; |
60221920 | 595 | int retval; |
1da177e4 | 596 | |
317e6b65 | 597 | port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL); |
1da177e4 | 598 | if (!port) |
317e6b65 | 599 | return ERR_PTR(-ENOMEM); |
1da177e4 | 600 | |
1da177e4 | 601 | init_waitqueue_head(&port->remove_wq); |
1da177e4 | 602 | INIT_LIST_HEAD(&port->unit_list_head); |
5ab944f9 | 603 | INIT_WORK(&port->gid_pn_work, zfcp_erp_port_strategy_open_lookup); |
1da177e4 LT |
604 | |
605 | port->adapter = adapter; | |
317e6b65 SS |
606 | port->d_id = d_id; |
607 | port->wwpn = wwpn; | |
1da177e4 | 608 | |
317e6b65 SS |
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); | |
1da177e4 | 612 | |
adc90daf CS |
613 | dev_set_name(&port->sysfs_device, "0x%016llx", |
614 | (unsigned long long)wwpn); | |
5ab944f9 | 615 | port->sysfs_device.parent = &adapter->ccw_device->dev; |
cc8c2829 | 616 | |
1da177e4 LT |
617 | port->sysfs_device.release = zfcp_sysfs_port_release; |
618 | dev_set_drvdata(&port->sysfs_device, port); | |
619 | ||
317e6b65 SS |
620 | read_lock_irq(&zfcp_data.config_lock); |
621 | if (!(status & ZFCP_STATUS_PORT_NO_WWPN)) | |
622 | if (zfcp_get_port_by_wwpn(adapter, wwpn)) { | |
623 | read_unlock_irq(&zfcp_data.config_lock); | |
624 | goto err_out_free; | |
625 | } | |
626 | read_unlock_irq(&zfcp_data.config_lock); | |
1da177e4 | 627 | |
317e6b65 SS |
628 | if (device_register(&port->sysfs_device)) |
629 | goto err_out_free; | |
1da177e4 | 630 | |
5ab944f9 SS |
631 | retval = sysfs_create_group(&port->sysfs_device.kobj, |
632 | &zfcp_sysfs_port_attrs); | |
60221920 SS |
633 | |
634 | if (retval) { | |
1da177e4 | 635 | device_unregister(&port->sysfs_device); |
317e6b65 | 636 | goto err_out; |
1da177e4 LT |
637 | } |
638 | ||
639 | zfcp_port_get(port); | |
640 | ||
1da177e4 | 641 | write_lock_irq(&zfcp_data.config_lock); |
3859f6a2 | 642 | list_add_tail(&port->list, &adapter->port_list_head); |
1da177e4 LT |
643 | atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status); |
644 | atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status); | |
317e6b65 | 645 | |
1da177e4 LT |
646 | write_unlock_irq(&zfcp_data.config_lock); |
647 | ||
648 | zfcp_adapter_get(adapter); | |
1da177e4 | 649 | return port; |
317e6b65 SS |
650 | |
651 | err_out_free: | |
652 | kfree(port); | |
653 | err_out: | |
654 | return ERR_PTR(-EINVAL); | |
1da177e4 LT |
655 | } |
656 | ||
317e6b65 SS |
657 | /** |
658 | * zfcp_port_dequeue - dequeues a port from the port list of the adapter | |
659 | * @port: pointer to struct zfcp_port which should be removed | |
660 | */ | |
661 | void zfcp_port_dequeue(struct zfcp_port *port) | |
1da177e4 | 662 | { |
44cc76f2 | 663 | wait_event(port->remove_wq, atomic_read(&port->refcount) == 0); |
1da177e4 LT |
664 | write_lock_irq(&zfcp_data.config_lock); |
665 | list_del(&port->list); | |
1da177e4 | 666 | write_unlock_irq(&zfcp_data.config_lock); |
3859f6a2 | 667 | if (port->rport) |
20b1730a HC |
668 | fc_remote_port_delete(port->rport); |
669 | port->rport = NULL; | |
1da177e4 | 670 | zfcp_adapter_put(port->adapter); |
5ab944f9 | 671 | sysfs_remove_group(&port->sysfs_device.kobj, &zfcp_sysfs_port_attrs); |
1da177e4 LT |
672 | device_unregister(&port->sysfs_device); |
673 | } | |
674 | ||
317e6b65 SS |
675 | /** |
676 | * zfcp_sg_free_table - free memory used by scatterlists | |
677 | * @sg: pointer to scatterlist | |
678 | * @count: number of scatterlist which are to be free'ed | |
679 | * the scatterlist are expected to reference pages always | |
680 | */ | |
45633fdc CS |
681 | void zfcp_sg_free_table(struct scatterlist *sg, int count) |
682 | { | |
683 | int i; | |
684 | ||
685 | for (i = 0; i < count; i++, sg++) | |
686 | if (sg) | |
687 | free_page((unsigned long) sg_virt(sg)); | |
688 | else | |
689 | break; | |
690 | } | |
691 | ||
317e6b65 SS |
692 | /** |
693 | * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers | |
694 | * @sg: pointer to struct scatterlist | |
695 | * @count: number of scatterlists which should be assigned with buffers | |
696 | * of size page | |
697 | * | |
698 | * Returns: 0 on success, -ENOMEM otherwise | |
699 | */ | |
45633fdc CS |
700 | int zfcp_sg_setup_table(struct scatterlist *sg, int count) |
701 | { | |
702 | void *addr; | |
703 | int i; | |
704 | ||
705 | sg_init_table(sg, count); | |
706 | for (i = 0; i < count; i++, sg++) { | |
707 | addr = (void *) get_zeroed_page(GFP_KERNEL); | |
708 | if (!addr) { | |
709 | zfcp_sg_free_table(sg, i); | |
710 | return -ENOMEM; | |
711 | } | |
712 | sg_set_buf(sg, addr, PAGE_SIZE); | |
713 | } | |
714 | return 0; | |
715 | } |