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 | ||
ecf39d42 CS |
28 | #define KMSG_COMPONENT "zfcp" |
29 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
30 | ||
45633fdc | 31 | #include <linux/miscdevice.h> |
bd43a42b | 32 | #include <linux/seq_file.h> |
1da177e4 LT |
33 | #include "zfcp_ext.h" |
34 | ||
98df67b3 KS |
35 | #define ZFCP_BUS_ID_SIZE 20 |
36 | ||
1da177e4 | 37 | static char *device; |
1da177e4 | 38 | |
4a9d2d8b | 39 | MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com"); |
317e6b65 | 40 | MODULE_DESCRIPTION("FCP HBA driver"); |
1da177e4 LT |
41 | MODULE_LICENSE("GPL"); |
42 | ||
6f71d9bc | 43 | module_param(device, charp, 0400); |
1da177e4 LT |
44 | MODULE_PARM_DESC(device, "specify initial device"); |
45 | ||
ca2d02c2 | 46 | static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter) |
fea9d6c7 | 47 | { |
ca2d02c2 | 48 | int idx; |
fea9d6c7 VS |
49 | |
50 | adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head), | |
51 | GFP_KERNEL); | |
fea9d6c7 VS |
52 | if (!adapter->req_list) |
53 | return -ENOMEM; | |
54 | ||
ca2d02c2 HC |
55 | for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) |
56 | INIT_LIST_HEAD(&adapter->req_list[idx]); | |
fea9d6c7 VS |
57 | return 0; |
58 | } | |
59 | ||
317e6b65 SS |
60 | /** |
61 | * zfcp_reqlist_isempty - is the request list empty | |
62 | * @adapter: pointer to struct zfcp_adapter | |
63 | * | |
64 | * Returns: true if list is empty, false otherwise | |
65 | */ | |
fea9d6c7 VS |
66 | int zfcp_reqlist_isempty(struct zfcp_adapter *adapter) |
67 | { | |
ca2d02c2 | 68 | unsigned int idx; |
fea9d6c7 | 69 | |
ca2d02c2 HC |
70 | for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) |
71 | if (!list_empty(&adapter->req_list[idx])) | |
fea9d6c7 | 72 | return 0; |
fea9d6c7 VS |
73 | return 1; |
74 | } | |
75 | ||
317e6b65 | 76 | static int __init zfcp_device_setup(char *devstr) |
1da177e4 | 77 | { |
317e6b65 SS |
78 | char *token; |
79 | char *str; | |
1da177e4 | 80 | |
cd8a383e | 81 | if (!devstr) |
1da177e4 LT |
82 | return 0; |
83 | ||
317e6b65 SS |
84 | /* duplicate devstr and keep the original for sysfs presentation*/ |
85 | str = kmalloc(strlen(devstr) + 1, GFP_KERNEL); | |
86 | if (!str) | |
553448f6 | 87 | return 0; |
cd8a383e | 88 | |
317e6b65 | 89 | strcpy(str, devstr); |
1da177e4 | 90 | |
317e6b65 | 91 | token = strsep(&str, ","); |
98df67b3 | 92 | if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE) |
1da177e4 | 93 | goto err_out; |
98df67b3 | 94 | strncpy(zfcp_data.init_busid, token, ZFCP_BUS_ID_SIZE); |
317e6b65 SS |
95 | |
96 | token = strsep(&str, ","); | |
7ba58c9c SS |
97 | if (!token || strict_strtoull(token, 0, |
98 | (unsigned long long *) &zfcp_data.init_wwpn)) | |
1da177e4 LT |
99 | goto err_out; |
100 | ||
317e6b65 | 101 | token = strsep(&str, ","); |
7ba58c9c SS |
102 | if (!token || strict_strtoull(token, 0, |
103 | (unsigned long long *) &zfcp_data.init_fcp_lun)) | |
1da177e4 | 104 | goto err_out; |
317e6b65 | 105 | |
cd8a383e | 106 | kfree(str); |
1da177e4 LT |
107 | return 1; |
108 | ||
109 | err_out: | |
cd8a383e | 110 | kfree(str); |
ecf39d42 | 111 | pr_err("%s is not a valid SCSI device\n", devstr); |
1da177e4 LT |
112 | return 0; |
113 | } | |
114 | ||
317e6b65 | 115 | static void __init zfcp_init_device_configure(void) |
1da177e4 LT |
116 | { |
117 | struct zfcp_adapter *adapter; | |
118 | struct zfcp_port *port; | |
119 | struct zfcp_unit *unit; | |
120 | ||
121 | down(&zfcp_data.config_sema); | |
122 | read_lock_irq(&zfcp_data.config_lock); | |
123 | adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid); | |
124 | if (adapter) | |
125 | zfcp_adapter_get(adapter); | |
126 | read_unlock_irq(&zfcp_data.config_lock); | |
127 | ||
317e6b65 | 128 | if (!adapter) |
1da177e4 LT |
129 | goto out_adapter; |
130 | port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0); | |
317e6b65 | 131 | if (IS_ERR(port)) |
1da177e4 LT |
132 | goto out_port; |
133 | unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun); | |
317e6b65 | 134 | if (IS_ERR(unit)) |
1da177e4 LT |
135 | goto out_unit; |
136 | up(&zfcp_data.config_sema); | |
137 | ccw_device_set_online(adapter->ccw_device); | |
091694a5 | 138 | |
1da177e4 | 139 | zfcp_erp_wait(adapter); |
091694a5 SS |
140 | wait_event(adapter->erp_done_wqh, |
141 | !(atomic_read(&unit->status) & | |
142 | ZFCP_STATUS_UNIT_SCSI_WORK_PENDING)); | |
143 | ||
1da177e4 LT |
144 | down(&zfcp_data.config_sema); |
145 | zfcp_unit_put(unit); | |
317e6b65 | 146 | out_unit: |
1da177e4 | 147 | zfcp_port_put(port); |
317e6b65 | 148 | out_port: |
1da177e4 | 149 | zfcp_adapter_put(adapter); |
317e6b65 | 150 | out_adapter: |
1da177e4 LT |
151 | up(&zfcp_data.config_sema); |
152 | return; | |
153 | } | |
154 | ||
317e6b65 | 155 | static struct kmem_cache *zfcp_cache_create(int size, char *name) |
dd52e0ea HC |
156 | { |
157 | int align = 1; | |
dd52e0ea HC |
158 | while ((size - align) > 0) |
159 | align <<= 1; | |
317e6b65 | 160 | return kmem_cache_create(name , size, align, 0, NULL); |
dd52e0ea HC |
161 | } |
162 | ||
317e6b65 | 163 | static int __init zfcp_module_init(void) |
1da177e4 | 164 | { |
dd52e0ea | 165 | int retval = -ENOMEM; |
dd52e0ea | 166 | |
317e6b65 SS |
167 | zfcp_data.fsf_req_qtcb_cache = zfcp_cache_create( |
168 | sizeof(struct zfcp_fsf_req_qtcb), "zfcp_fsf"); | |
dd52e0ea HC |
169 | if (!zfcp_data.fsf_req_qtcb_cache) |
170 | goto out; | |
1da177e4 | 171 | |
317e6b65 SS |
172 | zfcp_data.sr_buffer_cache = zfcp_cache_create( |
173 | sizeof(struct fsf_status_read_buffer), "zfcp_sr"); | |
dd52e0ea HC |
174 | if (!zfcp_data.sr_buffer_cache) |
175 | goto out_sr_cache; | |
176 | ||
317e6b65 SS |
177 | zfcp_data.gid_pn_cache = zfcp_cache_create( |
178 | sizeof(struct zfcp_gid_pn_data), "zfcp_gid"); | |
dd52e0ea HC |
179 | if (!zfcp_data.gid_pn_cache) |
180 | goto out_gid_cache; | |
1da177e4 | 181 | |
b7f15f3c SS |
182 | zfcp_data.work_queue = create_singlethread_workqueue("zfcp_wq"); |
183 | ||
1da177e4 | 184 | INIT_LIST_HEAD(&zfcp_data.adapter_list_head); |
317e6b65 SS |
185 | sema_init(&zfcp_data.config_sema, 1); |
186 | rwlock_init(&zfcp_data.config_lock); | |
187 | ||
dd52e0ea HC |
188 | zfcp_data.scsi_transport_template = |
189 | fc_attach_transport(&zfcp_transport_functions); | |
190 | if (!zfcp_data.scsi_transport_template) | |
191 | goto out_transport; | |
1da177e4 | 192 | |
1da177e4 | 193 | retval = misc_register(&zfcp_cfdc_misc); |
317e6b65 | 194 | if (retval) { |
ecf39d42 | 195 | pr_err("Registering the misc device zfcp_cfdc failed\n"); |
dd52e0ea | 196 | goto out_misc; |
1da177e4 LT |
197 | } |
198 | ||
1da177e4 LT |
199 | retval = zfcp_ccw_register(); |
200 | if (retval) { | |
ecf39d42 | 201 | pr_err("The zfcp device driver could not register with " |
ff3b24fa | 202 | "the common I/O layer\n"); |
1da177e4 LT |
203 | goto out_ccw_register; |
204 | } | |
205 | ||
206 | if (zfcp_device_setup(device)) | |
207 | zfcp_init_device_configure(); | |
208 | ||
209 | goto out; | |
210 | ||
317e6b65 | 211 | out_ccw_register: |
1da177e4 | 212 | misc_deregister(&zfcp_cfdc_misc); |
317e6b65 | 213 | out_misc: |
dd52e0ea | 214 | fc_release_transport(zfcp_data.scsi_transport_template); |
317e6b65 | 215 | out_transport: |
dd52e0ea | 216 | kmem_cache_destroy(zfcp_data.gid_pn_cache); |
317e6b65 | 217 | out_gid_cache: |
dd52e0ea | 218 | kmem_cache_destroy(zfcp_data.sr_buffer_cache); |
317e6b65 | 219 | out_sr_cache: |
dd52e0ea | 220 | kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache); |
317e6b65 | 221 | out: |
1da177e4 LT |
222 | return retval; |
223 | } | |
224 | ||
317e6b65 | 225 | module_init(zfcp_module_init); |
1da177e4 | 226 | |
1da177e4 LT |
227 | /** |
228 | * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN | |
229 | * @port: pointer to port to search for unit | |
230 | * @fcp_lun: FCP LUN to search for | |
317e6b65 SS |
231 | * |
232 | * Returns: pointer to zfcp_unit or NULL | |
1da177e4 | 233 | */ |
7ba58c9c | 234 | struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *port, u64 fcp_lun) |
1da177e4 LT |
235 | { |
236 | struct zfcp_unit *unit; | |
1da177e4 | 237 | |
317e6b65 | 238 | list_for_each_entry(unit, &port->unit_list_head, list) |
1da177e4 | 239 | if ((unit->fcp_lun == fcp_lun) && |
317e6b65 SS |
240 | !(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_REMOVE)) |
241 | return unit; | |
242 | return NULL; | |
1da177e4 LT |
243 | } |
244 | ||
245 | /** | |
246 | * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn | |
247 | * @adapter: pointer to adapter to search for port | |
248 | * @wwpn: wwpn to search for | |
317e6b65 SS |
249 | * |
250 | * Returns: pointer to zfcp_port or NULL | |
1da177e4 | 251 | */ |
317e6b65 | 252 | struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, |
7ba58c9c | 253 | u64 wwpn) |
1da177e4 LT |
254 | { |
255 | struct zfcp_port *port; | |
1da177e4 | 256 | |
317e6b65 SS |
257 | list_for_each_entry(port, &adapter->port_list_head, list) |
258 | if ((port->wwpn == wwpn) && !(atomic_read(&port->status) & | |
259 | (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) | |
260 | return port; | |
261 | return NULL; | |
1da177e4 LT |
262 | } |
263 | ||
60221920 SS |
264 | static void zfcp_sysfs_unit_release(struct device *dev) |
265 | { | |
266 | kfree(container_of(dev, struct zfcp_unit, sysfs_device)); | |
267 | } | |
268 | ||
1da177e4 LT |
269 | /** |
270 | * zfcp_unit_enqueue - enqueue unit to unit list of a port. | |
271 | * @port: pointer to port where unit is added | |
272 | * @fcp_lun: FCP LUN of unit to be enqueued | |
317e6b65 | 273 | * Returns: pointer to enqueued unit on success, ERR_PTR on error |
1da177e4 LT |
274 | * Locks: config_sema must be held to serialize changes to the unit list |
275 | * | |
276 | * Sets up some unit internal structures and creates sysfs entry. | |
277 | */ | |
7ba58c9c | 278 | struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, u64 fcp_lun) |
1da177e4 | 279 | { |
462b7859 | 280 | struct zfcp_unit *unit; |
1da177e4 | 281 | |
317e6b65 | 282 | unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL); |
1da177e4 | 283 | if (!unit) |
317e6b65 | 284 | return ERR_PTR(-ENOMEM); |
1da177e4 | 285 | |
1da177e4 LT |
286 | atomic_set(&unit->refcount, 0); |
287 | init_waitqueue_head(&unit->remove_wq); | |
288 | ||
289 | unit->port = port; | |
290 | unit->fcp_lun = fcp_lun; | |
291 | ||
1bf5b285 CH |
292 | dev_set_name(&unit->sysfs_device, "0x%016llx", |
293 | (unsigned long long) fcp_lun); | |
1da177e4 LT |
294 | unit->sysfs_device.parent = &port->sysfs_device; |
295 | unit->sysfs_device.release = zfcp_sysfs_unit_release; | |
296 | dev_set_drvdata(&unit->sysfs_device, unit); | |
297 | ||
298 | /* mark unit unusable as long as sysfs registration is not complete */ | |
299 | atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status); | |
300 | ||
c9615858 CS |
301 | spin_lock_init(&unit->latencies.lock); |
302 | unit->latencies.write.channel.min = 0xFFFFFFFF; | |
303 | unit->latencies.write.fabric.min = 0xFFFFFFFF; | |
304 | unit->latencies.read.channel.min = 0xFFFFFFFF; | |
305 | unit->latencies.read.fabric.min = 0xFFFFFFFF; | |
306 | unit->latencies.cmd.channel.min = 0xFFFFFFFF; | |
307 | unit->latencies.cmd.fabric.min = 0xFFFFFFFF; | |
308 | ||
317e6b65 SS |
309 | read_lock_irq(&zfcp_data.config_lock); |
310 | if (zfcp_get_unit_by_lun(port, fcp_lun)) { | |
311 | read_unlock_irq(&zfcp_data.config_lock); | |
312 | goto err_out_free; | |
1da177e4 | 313 | } |
317e6b65 SS |
314 | read_unlock_irq(&zfcp_data.config_lock); |
315 | ||
316 | if (device_register(&unit->sysfs_device)) | |
317 | goto err_out_free; | |
1da177e4 | 318 | |
60221920 SS |
319 | if (sysfs_create_group(&unit->sysfs_device.kobj, |
320 | &zfcp_sysfs_unit_attrs)) { | |
1da177e4 | 321 | device_unregister(&unit->sysfs_device); |
317e6b65 | 322 | return ERR_PTR(-EIO); |
1da177e4 LT |
323 | } |
324 | ||
325 | zfcp_unit_get(unit); | |
326 | ||
1da177e4 | 327 | write_lock_irq(&zfcp_data.config_lock); |
462b7859 | 328 | list_add_tail(&unit->list, &port->unit_list_head); |
1da177e4 LT |
329 | atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status); |
330 | atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status); | |
317e6b65 | 331 | |
1da177e4 LT |
332 | write_unlock_irq(&zfcp_data.config_lock); |
333 | ||
1da177e4 LT |
334 | zfcp_port_get(port); |
335 | ||
336 | return unit; | |
317e6b65 SS |
337 | |
338 | err_out_free: | |
339 | kfree(unit); | |
340 | return ERR_PTR(-EINVAL); | |
1da177e4 LT |
341 | } |
342 | ||
317e6b65 SS |
343 | /** |
344 | * zfcp_unit_dequeue - dequeue unit | |
345 | * @unit: pointer to zfcp_unit | |
346 | * | |
347 | * waits until all work is done on unit and removes it then from the unit->list | |
348 | * of the associated port. | |
349 | */ | |
350 | void zfcp_unit_dequeue(struct zfcp_unit *unit) | |
1da177e4 | 351 | { |
44cc76f2 | 352 | wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0); |
1da177e4 LT |
353 | write_lock_irq(&zfcp_data.config_lock); |
354 | list_del(&unit->list); | |
355 | write_unlock_irq(&zfcp_data.config_lock); | |
1da177e4 | 356 | zfcp_port_put(unit->port); |
60221920 | 357 | sysfs_remove_group(&unit->sysfs_device.kobj, &zfcp_sysfs_unit_attrs); |
1da177e4 LT |
358 | device_unregister(&unit->sysfs_device); |
359 | } | |
360 | ||
317e6b65 | 361 | static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter) |
1da177e4 | 362 | { |
317e6b65 | 363 | /* must only be called with zfcp_data.config_sema taken */ |
1da177e4 | 364 | adapter->pool.fsf_req_erp = |
317e6b65 | 365 | mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache); |
0eaae62a | 366 | if (!adapter->pool.fsf_req_erp) |
1da177e4 LT |
367 | return -ENOMEM; |
368 | ||
369 | adapter->pool.fsf_req_scsi = | |
317e6b65 | 370 | mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache); |
0eaae62a | 371 | if (!adapter->pool.fsf_req_scsi) |
1da177e4 LT |
372 | return -ENOMEM; |
373 | ||
374 | adapter->pool.fsf_req_abort = | |
317e6b65 | 375 | mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache); |
0eaae62a | 376 | if (!adapter->pool.fsf_req_abort) |
1da177e4 LT |
377 | return -ENOMEM; |
378 | ||
379 | adapter->pool.fsf_req_status_read = | |
317e6b65 | 380 | mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM, |
0eaae62a MD |
381 | sizeof(struct zfcp_fsf_req)); |
382 | if (!adapter->pool.fsf_req_status_read) | |
1da177e4 LT |
383 | return -ENOMEM; |
384 | ||
385 | adapter->pool.data_status_read = | |
317e6b65 | 386 | mempool_create_slab_pool(FSF_STATUS_READS_RECOM, |
dd52e0ea | 387 | zfcp_data.sr_buffer_cache); |
0eaae62a | 388 | if (!adapter->pool.data_status_read) |
1da177e4 LT |
389 | return -ENOMEM; |
390 | ||
391 | adapter->pool.data_gid_pn = | |
317e6b65 | 392 | mempool_create_slab_pool(1, zfcp_data.gid_pn_cache); |
0eaae62a | 393 | if (!adapter->pool.data_gid_pn) |
1da177e4 LT |
394 | return -ENOMEM; |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
317e6b65 | 399 | static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter) |
1da177e4 | 400 | { |
317e6b65 | 401 | /* zfcp_data.config_sema must be held */ |
1da177e4 LT |
402 | if (adapter->pool.fsf_req_erp) |
403 | mempool_destroy(adapter->pool.fsf_req_erp); | |
404 | if (adapter->pool.fsf_req_scsi) | |
405 | mempool_destroy(adapter->pool.fsf_req_scsi); | |
406 | if (adapter->pool.fsf_req_abort) | |
407 | mempool_destroy(adapter->pool.fsf_req_abort); | |
408 | if (adapter->pool.fsf_req_status_read) | |
409 | mempool_destroy(adapter->pool.fsf_req_status_read); | |
410 | if (adapter->pool.data_status_read) | |
411 | mempool_destroy(adapter->pool.data_status_read); | |
412 | if (adapter->pool.data_gid_pn) | |
413 | mempool_destroy(adapter->pool.data_gid_pn); | |
414 | } | |
415 | ||
317e6b65 SS |
416 | /** |
417 | * zfcp_status_read_refill - refill the long running status_read_requests | |
418 | * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled | |
419 | * | |
420 | * Returns: 0 on success, 1 otherwise | |
421 | * | |
422 | * if there are 16 or more status_read requests missing an adapter_reopen | |
423 | * is triggered | |
424 | */ | |
d26ab06e SS |
425 | int zfcp_status_read_refill(struct zfcp_adapter *adapter) |
426 | { | |
427 | while (atomic_read(&adapter->stat_miss) > 0) | |
c41f8cbd | 428 | if (zfcp_fsf_status_read(adapter)) { |
7afe29f7 SS |
429 | if (atomic_read(&adapter->stat_miss) >= 16) { |
430 | zfcp_erp_adapter_reopen(adapter, 0, 103, NULL); | |
431 | return 1; | |
432 | } | |
d26ab06e | 433 | break; |
7afe29f7 SS |
434 | } else |
435 | atomic_dec(&adapter->stat_miss); | |
d26ab06e SS |
436 | return 0; |
437 | } | |
438 | ||
439 | static void _zfcp_status_read_scheduler(struct work_struct *work) | |
440 | { | |
441 | zfcp_status_read_refill(container_of(work, struct zfcp_adapter, | |
442 | stat_work)); | |
443 | } | |
444 | ||
bd43a42b CS |
445 | static void zfcp_print_sl(struct seq_file *m, struct service_level *sl) |
446 | { | |
447 | struct zfcp_adapter *adapter = | |
448 | container_of(sl, struct zfcp_adapter, service_level); | |
449 | ||
450 | seq_printf(m, "zfcp: %s microcode level %x\n", | |
451 | dev_name(&adapter->ccw_device->dev), | |
452 | adapter->fsf_lic_version); | |
453 | } | |
454 | ||
317e6b65 SS |
455 | /** |
456 | * zfcp_adapter_enqueue - enqueue a new adapter to the list | |
457 | * @ccw_device: pointer to the struct cc_device | |
458 | * | |
459 | * Returns: 0 if a new adapter was successfully enqueued | |
460 | * -ENOMEM if alloc failed | |
1da177e4 LT |
461 | * Enqueues an adapter at the end of the adapter list in the driver data. |
462 | * All adapter internal structures are set up. | |
463 | * Proc-fs entries are also created. | |
1da177e4 LT |
464 | * locks: config_sema must be held to serialise changes to the adapter list |
465 | */ | |
317e6b65 | 466 | int zfcp_adapter_enqueue(struct ccw_device *ccw_device) |
1da177e4 | 467 | { |
1da177e4 LT |
468 | struct zfcp_adapter *adapter; |
469 | ||
470 | /* | |
41fa2ada | 471 | * Note: It is safe to release the list_lock, as any list changes |
1da177e4 LT |
472 | * are protected by the config_sema, which must be held to get here |
473 | */ | |
474 | ||
317e6b65 | 475 | adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL); |
553448f6 | 476 | if (!adapter) |
317e6b65 | 477 | return -ENOMEM; |
1da177e4 LT |
478 | |
479 | ccw_device->handler = NULL; | |
1da177e4 | 480 | adapter->ccw_device = ccw_device; |
317e6b65 | 481 | atomic_set(&adapter->refcount, 0); |
1da177e4 | 482 | |
00bab910 | 483 | if (zfcp_qdio_allocate(adapter)) |
1da177e4 LT |
484 | goto qdio_allocate_failed; |
485 | ||
00bab910 | 486 | if (zfcp_allocate_low_mem_buffers(adapter)) |
1da177e4 | 487 | goto failed_low_mem_buffers; |
1da177e4 | 488 | |
317e6b65 SS |
489 | if (zfcp_reqlist_alloc(adapter)) |
490 | goto failed_low_mem_buffers; | |
491 | ||
492 | if (zfcp_adapter_debug_register(adapter)) | |
493 | goto debug_register_failed; | |
494 | ||
1da177e4 | 495 | init_waitqueue_head(&adapter->remove_wq); |
317e6b65 SS |
496 | init_waitqueue_head(&adapter->erp_thread_wqh); |
497 | init_waitqueue_head(&adapter->erp_done_wqh); | |
1da177e4 | 498 | |
1da177e4 | 499 | INIT_LIST_HEAD(&adapter->port_list_head); |
317e6b65 SS |
500 | INIT_LIST_HEAD(&adapter->erp_ready_head); |
501 | INIT_LIST_HEAD(&adapter->erp_running_head); | |
1da177e4 | 502 | |
fea9d6c7 | 503 | spin_lock_init(&adapter->req_list_lock); |
c48a29d0 | 504 | |
c48a29d0 HC |
505 | spin_lock_init(&adapter->hba_dbf_lock); |
506 | spin_lock_init(&adapter->san_dbf_lock); | |
507 | spin_lock_init(&adapter->scsi_dbf_lock); | |
d79a83db | 508 | spin_lock_init(&adapter->rec_dbf_lock); |
0406289e | 509 | spin_lock_init(&adapter->req_q_lock); |
c48a29d0 | 510 | |
c48a29d0 | 511 | rwlock_init(&adapter->erp_lock); |
1da177e4 LT |
512 | rwlock_init(&adapter->abort_lock); |
513 | ||
317e6b65 | 514 | sema_init(&adapter->erp_ready_sem, 0); |
1da177e4 | 515 | |
d26ab06e | 516 | INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler); |
cc8c2829 | 517 | INIT_WORK(&adapter->scan_work, _zfcp_scan_ports_later); |
1da177e4 | 518 | |
bd43a42b CS |
519 | adapter->service_level.seq_print = zfcp_print_sl; |
520 | ||
1da177e4 LT |
521 | /* mark adapter unusable as long as sysfs registration is not complete */ |
522 | atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status); | |
523 | ||
1da177e4 LT |
524 | dev_set_drvdata(&ccw_device->dev, adapter); |
525 | ||
60221920 SS |
526 | if (sysfs_create_group(&ccw_device->dev.kobj, |
527 | &zfcp_sysfs_adapter_attrs)) | |
1da177e4 LT |
528 | goto sysfs_failed; |
529 | ||
1da177e4 LT |
530 | write_lock_irq(&zfcp_data.config_lock); |
531 | atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status); | |
532 | list_add_tail(&adapter->list, &zfcp_data.adapter_list_head); | |
533 | write_unlock_irq(&zfcp_data.config_lock); | |
534 | ||
5ab944f9 | 535 | zfcp_fc_nameserver_init(adapter); |
cc8c2829 | 536 | |
317e6b65 | 537 | return 0; |
1da177e4 | 538 | |
317e6b65 | 539 | sysfs_failed: |
ff17a29d | 540 | zfcp_adapter_debug_unregister(adapter); |
317e6b65 | 541 | debug_register_failed: |
1da177e4 | 542 | dev_set_drvdata(&ccw_device->dev, NULL); |
317e6b65 SS |
543 | kfree(adapter->req_list); |
544 | failed_low_mem_buffers: | |
1da177e4 | 545 | zfcp_free_low_mem_buffers(adapter); |
317e6b65 | 546 | qdio_allocate_failed: |
00bab910 | 547 | zfcp_qdio_free(adapter); |
1da177e4 | 548 | kfree(adapter); |
317e6b65 | 549 | return -ENOMEM; |
1da177e4 LT |
550 | } |
551 | ||
317e6b65 SS |
552 | /** |
553 | * zfcp_adapter_dequeue - remove the adapter from the resource list | |
554 | * @adapter: pointer to struct zfcp_adapter which should be removed | |
1da177e4 | 555 | * locks: adapter list write lock is assumed to be held by caller |
1da177e4 | 556 | */ |
317e6b65 | 557 | void zfcp_adapter_dequeue(struct zfcp_adapter *adapter) |
1da177e4 LT |
558 | { |
559 | int retval = 0; | |
560 | unsigned long flags; | |
561 | ||
cc8c2829 | 562 | cancel_work_sync(&adapter->scan_work); |
d26ab06e | 563 | cancel_work_sync(&adapter->stat_work); |
9f28745a | 564 | zfcp_adapter_scsi_unregister(adapter); |
60221920 SS |
565 | sysfs_remove_group(&adapter->ccw_device->dev.kobj, |
566 | &zfcp_sysfs_adapter_attrs); | |
1da177e4 LT |
567 | dev_set_drvdata(&adapter->ccw_device->dev, NULL); |
568 | /* sanity check: no pending FSF requests */ | |
fea9d6c7 VS |
569 | spin_lock_irqsave(&adapter->req_list_lock, flags); |
570 | retval = zfcp_reqlist_isempty(adapter); | |
571 | spin_unlock_irqrestore(&adapter->req_list_lock, flags); | |
317e6b65 SS |
572 | if (!retval) |
573 | return; | |
1da177e4 | 574 | |
ff17a29d CS |
575 | zfcp_adapter_debug_unregister(adapter); |
576 | ||
1da177e4 LT |
577 | /* remove specified adapter data structure from list */ |
578 | write_lock_irq(&zfcp_data.config_lock); | |
579 | list_del(&adapter->list); | |
580 | write_unlock_irq(&zfcp_data.config_lock); | |
581 | ||
00bab910 | 582 | zfcp_qdio_free(adapter); |
1da177e4 LT |
583 | |
584 | zfcp_free_low_mem_buffers(adapter); | |
317e6b65 | 585 | kfree(adapter->req_list); |
f6cd94b1 AH |
586 | kfree(adapter->fc_stats); |
587 | kfree(adapter->stats_reset_data); | |
1da177e4 | 588 | kfree(adapter); |
1da177e4 LT |
589 | } |
590 | ||
60221920 SS |
591 | static void zfcp_sysfs_port_release(struct device *dev) |
592 | { | |
593 | kfree(container_of(dev, struct zfcp_port, sysfs_device)); | |
594 | } | |
595 | ||
1da177e4 LT |
596 | /** |
597 | * zfcp_port_enqueue - enqueue port to port list of adapter | |
598 | * @adapter: adapter where remote port is added | |
599 | * @wwpn: WWPN of the remote port to be enqueued | |
600 | * @status: initial status for the port | |
601 | * @d_id: destination id of the remote port to be enqueued | |
317e6b65 | 602 | * Returns: pointer to enqueued port on success, ERR_PTR on error |
1da177e4 LT |
603 | * Locks: config_sema must be held to serialize changes to the port list |
604 | * | |
605 | * All port internal structures are set up and the sysfs entry is generated. | |
606 | * d_id is used to enqueue ports with a well known address like the Directory | |
607 | * Service for nameserver lookup. | |
608 | */ | |
7ba58c9c | 609 | struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn, |
317e6b65 | 610 | u32 status, u32 d_id) |
1da177e4 | 611 | { |
3859f6a2 | 612 | struct zfcp_port *port; |
60221920 | 613 | int retval; |
1da177e4 | 614 | |
317e6b65 | 615 | port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL); |
1da177e4 | 616 | if (!port) |
317e6b65 | 617 | return ERR_PTR(-ENOMEM); |
1da177e4 | 618 | |
1da177e4 | 619 | init_waitqueue_head(&port->remove_wq); |
1da177e4 | 620 | INIT_LIST_HEAD(&port->unit_list_head); |
5ab944f9 | 621 | INIT_WORK(&port->gid_pn_work, zfcp_erp_port_strategy_open_lookup); |
1da177e4 LT |
622 | |
623 | port->adapter = adapter; | |
317e6b65 SS |
624 | port->d_id = d_id; |
625 | port->wwpn = wwpn; | |
1da177e4 | 626 | |
317e6b65 SS |
627 | /* mark port unusable as long as sysfs registration is not complete */ |
628 | atomic_set_mask(status | ZFCP_STATUS_COMMON_REMOVE, &port->status); | |
629 | atomic_set(&port->refcount, 0); | |
1da177e4 | 630 | |
adc90daf CS |
631 | dev_set_name(&port->sysfs_device, "0x%016llx", |
632 | (unsigned long long)wwpn); | |
5ab944f9 | 633 | port->sysfs_device.parent = &adapter->ccw_device->dev; |
cc8c2829 | 634 | |
1da177e4 LT |
635 | port->sysfs_device.release = zfcp_sysfs_port_release; |
636 | dev_set_drvdata(&port->sysfs_device, port); | |
637 | ||
317e6b65 SS |
638 | read_lock_irq(&zfcp_data.config_lock); |
639 | if (!(status & ZFCP_STATUS_PORT_NO_WWPN)) | |
640 | if (zfcp_get_port_by_wwpn(adapter, wwpn)) { | |
641 | read_unlock_irq(&zfcp_data.config_lock); | |
642 | goto err_out_free; | |
643 | } | |
644 | read_unlock_irq(&zfcp_data.config_lock); | |
1da177e4 | 645 | |
317e6b65 SS |
646 | if (device_register(&port->sysfs_device)) |
647 | goto err_out_free; | |
1da177e4 | 648 | |
5ab944f9 SS |
649 | retval = sysfs_create_group(&port->sysfs_device.kobj, |
650 | &zfcp_sysfs_port_attrs); | |
60221920 SS |
651 | |
652 | if (retval) { | |
1da177e4 | 653 | device_unregister(&port->sysfs_device); |
317e6b65 | 654 | goto err_out; |
1da177e4 LT |
655 | } |
656 | ||
657 | zfcp_port_get(port); | |
658 | ||
1da177e4 | 659 | write_lock_irq(&zfcp_data.config_lock); |
3859f6a2 | 660 | list_add_tail(&port->list, &adapter->port_list_head); |
1da177e4 LT |
661 | atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status); |
662 | atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status); | |
317e6b65 | 663 | |
1da177e4 LT |
664 | write_unlock_irq(&zfcp_data.config_lock); |
665 | ||
666 | zfcp_adapter_get(adapter); | |
1da177e4 | 667 | return port; |
317e6b65 SS |
668 | |
669 | err_out_free: | |
670 | kfree(port); | |
671 | err_out: | |
672 | return ERR_PTR(-EINVAL); | |
1da177e4 LT |
673 | } |
674 | ||
317e6b65 SS |
675 | /** |
676 | * zfcp_port_dequeue - dequeues a port from the port list of the adapter | |
677 | * @port: pointer to struct zfcp_port which should be removed | |
678 | */ | |
679 | void zfcp_port_dequeue(struct zfcp_port *port) | |
1da177e4 | 680 | { |
44cc76f2 | 681 | wait_event(port->remove_wq, atomic_read(&port->refcount) == 0); |
1da177e4 LT |
682 | write_lock_irq(&zfcp_data.config_lock); |
683 | list_del(&port->list); | |
1da177e4 | 684 | write_unlock_irq(&zfcp_data.config_lock); |
3859f6a2 | 685 | if (port->rport) |
20b1730a HC |
686 | fc_remote_port_delete(port->rport); |
687 | port->rport = NULL; | |
1da177e4 | 688 | zfcp_adapter_put(port->adapter); |
5ab944f9 | 689 | sysfs_remove_group(&port->sysfs_device.kobj, &zfcp_sysfs_port_attrs); |
1da177e4 LT |
690 | device_unregister(&port->sysfs_device); |
691 | } | |
692 | ||
317e6b65 SS |
693 | /** |
694 | * zfcp_sg_free_table - free memory used by scatterlists | |
695 | * @sg: pointer to scatterlist | |
696 | * @count: number of scatterlist which are to be free'ed | |
697 | * the scatterlist are expected to reference pages always | |
698 | */ | |
45633fdc CS |
699 | void zfcp_sg_free_table(struct scatterlist *sg, int count) |
700 | { | |
701 | int i; | |
702 | ||
703 | for (i = 0; i < count; i++, sg++) | |
704 | if (sg) | |
705 | free_page((unsigned long) sg_virt(sg)); | |
706 | else | |
707 | break; | |
708 | } | |
709 | ||
317e6b65 SS |
710 | /** |
711 | * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers | |
712 | * @sg: pointer to struct scatterlist | |
713 | * @count: number of scatterlists which should be assigned with buffers | |
714 | * of size page | |
715 | * | |
716 | * Returns: 0 on success, -ENOMEM otherwise | |
717 | */ | |
45633fdc CS |
718 | int zfcp_sg_setup_table(struct scatterlist *sg, int count) |
719 | { | |
720 | void *addr; | |
721 | int i; | |
722 | ||
723 | sg_init_table(sg, count); | |
724 | for (i = 0; i < count; i++, sg++) { | |
725 | addr = (void *) get_zeroed_page(GFP_KERNEL); | |
726 | if (!addr) { | |
727 | zfcp_sg_free_table(sg, i); | |
728 | return -ENOMEM; | |
729 | } | |
730 | sg_set_buf(sg, addr, PAGE_SIZE); | |
731 | } | |
732 | return 0; | |
733 | } |