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Commit | Line | Data |
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a6a8d9f8 CS |
1 | /* |
2 | * SCSI device handler infrastruture. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the | |
6 | * Free Software Foundation; either version 2 of the License, or (at your | |
7 | * option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
18 | * Copyright IBM Corporation, 2007 | |
19 | * Authors: | |
20 | * Chandra Seetharaman <sekharan@us.ibm.com> | |
21 | * Mike Anderson <andmike@linux.vnet.ibm.com> | |
22 | */ | |
23 | ||
5a0e3ad6 | 24 | #include <linux/slab.h> |
acf3368f | 25 | #include <linux/module.h> |
a6a8d9f8 | 26 | #include <scsi/scsi_dh.h> |
daaa858b | 27 | #include "scsi_priv.h" |
a6a8d9f8 CS |
28 | |
29 | static DEFINE_SPINLOCK(list_lock); | |
30 | static LIST_HEAD(scsi_dh_list); | |
31 | ||
d95dbff2 CH |
32 | struct scsi_dh_blist { |
33 | const char *vendor; | |
34 | const char *model; | |
35 | const char *driver; | |
36 | }; | |
37 | ||
38 | static const struct scsi_dh_blist scsi_dh_blist[] = { | |
0ba43a81 XVP |
39 | {"DGC", "RAID", "emc" }, |
40 | {"DGC", "DISK", "emc" }, | |
41 | {"DGC", "VRAID", "emc" }, | |
d95dbff2 CH |
42 | |
43 | {"COMPAQ", "MSA1000 VOLUME", "hp_sw" }, | |
44 | {"COMPAQ", "HSV110", "hp_sw" }, | |
45 | {"HP", "HSV100", "hp_sw"}, | |
46 | {"DEC", "HSG80", "hp_sw"}, | |
47 | ||
48 | {"IBM", "1722", "rdac", }, | |
49 | {"IBM", "1724", "rdac", }, | |
50 | {"IBM", "1726", "rdac", }, | |
51 | {"IBM", "1742", "rdac", }, | |
52 | {"IBM", "1745", "rdac", }, | |
53 | {"IBM", "1746", "rdac", }, | |
54 | {"IBM", "1813", "rdac", }, | |
55 | {"IBM", "1814", "rdac", }, | |
56 | {"IBM", "1815", "rdac", }, | |
57 | {"IBM", "1818", "rdac", }, | |
58 | {"IBM", "3526", "rdac", }, | |
4b3aec2b XVP |
59 | {"IBM", "3542", "rdac", }, |
60 | {"IBM", "3552", "rdac", }, | |
37b37d26 XVP |
61 | {"SGI", "TP9300", "rdac", }, |
62 | {"SGI", "TP9400", "rdac", }, | |
63 | {"SGI", "TP9500", "rdac", }, | |
64 | {"SGI", "TP9700", "rdac", }, | |
d95dbff2 | 65 | {"SGI", "IS", "rdac", }, |
4b3aec2b | 66 | {"STK", "OPENstorage", "rdac", }, |
d95dbff2 | 67 | {"STK", "FLEXLINE 380", "rdac", }, |
4b3aec2b | 68 | {"STK", "BladeCtlr", "rdac", }, |
d95dbff2 CH |
69 | {"SUN", "CSM", "rdac", }, |
70 | {"SUN", "LCSM100", "rdac", }, | |
71 | {"SUN", "STK6580_6780", "rdac", }, | |
72 | {"SUN", "SUN_6180", "rdac", }, | |
73 | {"SUN", "ArrayStorage", "rdac", }, | |
74 | {"DELL", "MD3", "rdac", }, | |
75 | {"NETAPP", "INF-01-00", "rdac", }, | |
76 | {"LSI", "INF-01-00", "rdac", }, | |
77 | {"ENGENIO", "INF-01-00", "rdac", }, | |
78 | {NULL, NULL, NULL }, | |
79 | }; | |
80 | ||
81 | static const char * | |
82 | scsi_dh_find_driver(struct scsi_device *sdev) | |
83 | { | |
84 | const struct scsi_dh_blist *b; | |
85 | ||
86 | if (scsi_device_tpgs(sdev)) | |
87 | return "alua"; | |
88 | ||
89 | for (b = scsi_dh_blist; b->vendor; b++) { | |
90 | if (!strncmp(sdev->vendor, b->vendor, strlen(b->vendor)) && | |
91 | !strncmp(sdev->model, b->model, strlen(b->model))) { | |
92 | return b->driver; | |
93 | } | |
94 | } | |
95 | return NULL; | |
96 | } | |
97 | ||
98 | ||
566079c8 | 99 | static struct scsi_device_handler *__scsi_dh_lookup(const char *name) |
a6a8d9f8 CS |
100 | { |
101 | struct scsi_device_handler *tmp, *found = NULL; | |
102 | ||
103 | spin_lock(&list_lock); | |
104 | list_for_each_entry(tmp, &scsi_dh_list, list) { | |
765cbc6d | 105 | if (!strncmp(tmp->name, name, strlen(tmp->name))) { |
a6a8d9f8 CS |
106 | found = tmp; |
107 | break; | |
108 | } | |
109 | } | |
110 | spin_unlock(&list_lock); | |
111 | return found; | |
112 | } | |
113 | ||
566079c8 CH |
114 | static struct scsi_device_handler *scsi_dh_lookup(const char *name) |
115 | { | |
116 | struct scsi_device_handler *dh; | |
117 | ||
2ee5671e JT |
118 | if (!name || strlen(name) == 0) |
119 | return NULL; | |
120 | ||
566079c8 CH |
121 | dh = __scsi_dh_lookup(name); |
122 | if (!dh) { | |
1378889c | 123 | request_module("scsi_dh_%s", name); |
566079c8 CH |
124 | dh = __scsi_dh_lookup(name); |
125 | } | |
126 | ||
127 | return dh; | |
128 | } | |
129 | ||
a6a8d9f8 | 130 | /* |
765cbc6d HR |
131 | * scsi_dh_handler_attach - Attach a device handler to a device |
132 | * @sdev - SCSI device the device handler should attach to | |
133 | * @scsi_dh - The device handler to attach | |
134 | */ | |
135 | static int scsi_dh_handler_attach(struct scsi_device *sdev, | |
136 | struct scsi_device_handler *scsi_dh) | |
137 | { | |
2a8f7a03 | 138 | int error, ret = 0; |
765cbc6d | 139 | |
1f12ffa5 CH |
140 | if (!try_module_get(scsi_dh->module)) |
141 | return -EINVAL; | |
27c888f0 | 142 | |
ee14c674 | 143 | error = scsi_dh->attach(sdev); |
2a8f7a03 HR |
144 | if (error != SCSI_DH_OK) { |
145 | switch (error) { | |
146 | case SCSI_DH_NOMEM: | |
147 | ret = -ENOMEM; | |
148 | break; | |
149 | case SCSI_DH_RES_TEMP_UNAVAIL: | |
150 | ret = -EAGAIN; | |
151 | break; | |
2930f817 HR |
152 | case SCSI_DH_DEV_UNSUPP: |
153 | case SCSI_DH_NOSYS: | |
154 | ret = -ENODEV; | |
155 | break; | |
2a8f7a03 HR |
156 | default: |
157 | ret = -EINVAL; | |
158 | break; | |
159 | } | |
2930f817 HR |
160 | if (ret != -ENODEV) |
161 | sdev_printk(KERN_ERR, sdev, "%s: Attach failed (%d)\n", | |
162 | scsi_dh->name, error); | |
1f12ffa5 | 163 | module_put(scsi_dh->module); |
ee14c674 CH |
164 | } else |
165 | sdev->handler = scsi_dh; | |
1d520328 | 166 | |
2a8f7a03 | 167 | return ret; |
765cbc6d HR |
168 | } |
169 | ||
1bab0de0 CH |
170 | /* |
171 | * scsi_dh_handler_detach - Detach a device handler from a device | |
172 | * @sdev - SCSI device the device handler should be detached from | |
173 | */ | |
174 | static void scsi_dh_handler_detach(struct scsi_device *sdev) | |
6c10db72 | 175 | { |
ee14c674 CH |
176 | sdev->handler->detach(sdev); |
177 | sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", sdev->handler->name); | |
178 | module_put(sdev->handler->module); | |
6c10db72 CS |
179 | } |
180 | ||
2930f817 | 181 | void scsi_dh_add_device(struct scsi_device *sdev) |
4c05ae52 | 182 | { |
d95dbff2 CH |
183 | struct scsi_device_handler *devinfo = NULL; |
184 | const char *drv; | |
4c05ae52 | 185 | |
d95dbff2 CH |
186 | drv = scsi_dh_find_driver(sdev); |
187 | if (drv) | |
d6a32b98 | 188 | devinfo = __scsi_dh_lookup(drv); |
2930f817 HR |
189 | /* |
190 | * device_handler is optional, so ignore errors | |
191 | * from scsi_dh_handler_attach() | |
192 | */ | |
086b91d0 | 193 | if (devinfo) |
2930f817 | 194 | (void)scsi_dh_handler_attach(sdev, devinfo); |
a6a8d9f8 | 195 | } |
a6a8d9f8 | 196 | |
23695e41 | 197 | void scsi_dh_release_device(struct scsi_device *sdev) |
765cbc6d | 198 | { |
ee14c674 | 199 | if (sdev->handler) |
1bab0de0 | 200 | scsi_dh_handler_detach(sdev); |
23695e41 JN |
201 | } |
202 | ||
765cbc6d HR |
203 | /* |
204 | * scsi_register_device_handler - register a device handler personality | |
205 | * module. | |
206 | * @scsi_dh - device handler to be registered. | |
207 | * | |
208 | * Returns 0 on success, -EBUSY if handler already registered. | |
209 | */ | |
210 | int scsi_register_device_handler(struct scsi_device_handler *scsi_dh) | |
211 | { | |
566079c8 | 212 | if (__scsi_dh_lookup(scsi_dh->name)) |
765cbc6d HR |
213 | return -EBUSY; |
214 | ||
1f12ffa5 CH |
215 | if (!scsi_dh->attach || !scsi_dh->detach) |
216 | return -EINVAL; | |
217 | ||
765cbc6d HR |
218 | spin_lock(&list_lock); |
219 | list_add(&scsi_dh->list, &scsi_dh_list); | |
220 | spin_unlock(&list_lock); | |
940d7faa | 221 | |
765cbc6d HR |
222 | printk(KERN_INFO "%s: device handler registered\n", scsi_dh->name); |
223 | ||
224 | return SCSI_DH_OK; | |
225 | } | |
226 | EXPORT_SYMBOL_GPL(scsi_register_device_handler); | |
227 | ||
a6a8d9f8 CS |
228 | /* |
229 | * scsi_unregister_device_handler - register a device handler personality | |
230 | * module. | |
231 | * @scsi_dh - device handler to be unregistered. | |
232 | * | |
233 | * Returns 0 on success, -ENODEV if handler not registered. | |
234 | */ | |
235 | int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh) | |
236 | { | |
566079c8 | 237 | if (!__scsi_dh_lookup(scsi_dh->name)) |
765cbc6d | 238 | return -ENODEV; |
a6a8d9f8 | 239 | |
a6a8d9f8 CS |
240 | spin_lock(&list_lock); |
241 | list_del(&scsi_dh->list); | |
242 | spin_unlock(&list_lock); | |
765cbc6d | 243 | printk(KERN_INFO "%s: device handler unregistered\n", scsi_dh->name); |
a6a8d9f8 | 244 | |
765cbc6d | 245 | return SCSI_DH_OK; |
a6a8d9f8 CS |
246 | } |
247 | EXPORT_SYMBOL_GPL(scsi_unregister_device_handler); | |
248 | ||
249 | /* | |
250 | * scsi_dh_activate - activate the path associated with the scsi_device | |
251 | * corresponding to the given request queue. | |
3ae31f6a CS |
252 | * Returns immediately without waiting for activation to be completed. |
253 | * @q - Request queue that is associated with the scsi_device to be | |
254 | * activated. | |
255 | * @fn - Function to be called upon completion of the activation. | |
256 | * Function fn is called with data (below) and the error code. | |
257 | * Function fn may be called from the same calling context. So, | |
258 | * do not hold the lock in the caller which may be needed in fn. | |
259 | * @data - data passed to the function fn upon completion. | |
260 | * | |
a6a8d9f8 | 261 | */ |
3ae31f6a | 262 | int scsi_dh_activate(struct request_queue *q, activate_complete fn, void *data) |
a6a8d9f8 | 263 | { |
a6a8d9f8 | 264 | struct scsi_device *sdev; |
e959ed9a | 265 | int err = SCSI_DH_NOSYS; |
a6a8d9f8 | 266 | |
857de6e0 | 267 | sdev = scsi_device_from_queue(q); |
a18a920c | 268 | if (!sdev) { |
a18a920c MB |
269 | if (fn) |
270 | fn(data, err); | |
271 | return err; | |
272 | } | |
273 | ||
e959ed9a CH |
274 | if (!sdev->handler) |
275 | goto out_fn; | |
710105fd | 276 | err = SCSI_DH_NOTCONN; |
e959ed9a | 277 | if (sdev->sdev_state == SDEV_CANCEL || |
db422318 | 278 | sdev->sdev_state == SDEV_DEL) |
e959ed9a | 279 | goto out_fn; |
a6a8d9f8 | 280 | |
e959ed9a CH |
281 | err = SCSI_DH_DEV_OFFLINED; |
282 | if (sdev->sdev_state == SDEV_OFFLINE) | |
283 | goto out_fn; | |
a6a8d9f8 | 284 | |
ee14c674 CH |
285 | if (sdev->handler->activate) |
286 | err = sdev->handler->activate(sdev, fn, data); | |
e959ed9a CH |
287 | |
288 | out_put_device: | |
289 | put_device(&sdev->sdev_gendev); | |
a6a8d9f8 | 290 | return err; |
e959ed9a CH |
291 | |
292 | out_fn: | |
293 | if (fn) | |
294 | fn(data, err); | |
295 | goto out_put_device; | |
a6a8d9f8 CS |
296 | } |
297 | EXPORT_SYMBOL_GPL(scsi_dh_activate); | |
298 | ||
18ee70c9 CS |
299 | /* |
300 | * scsi_dh_set_params - set the parameters for the device as per the | |
301 | * string specified in params. | |
302 | * @q - Request queue that is associated with the scsi_device for | |
303 | * which the parameters to be set. | |
304 | * @params - parameters in the following format | |
305 | * "no_of_params\0param1\0param2\0param3\0...\0" | |
306 | * for example, string for 2 parameters with value 10 and 21 | |
307 | * is specified as "2\010\021\0". | |
308 | */ | |
309 | int scsi_dh_set_params(struct request_queue *q, const char *params) | |
310 | { | |
18ee70c9 | 311 | struct scsi_device *sdev; |
e959ed9a | 312 | int err = -SCSI_DH_NOSYS; |
18ee70c9 | 313 | |
857de6e0 | 314 | sdev = scsi_device_from_queue(q); |
e959ed9a | 315 | if (!sdev) |
18ee70c9 | 316 | return err; |
e959ed9a CH |
317 | |
318 | if (sdev->handler && sdev->handler->set_params) | |
319 | err = sdev->handler->set_params(sdev, params); | |
18ee70c9 CS |
320 | put_device(&sdev->sdev_gendev); |
321 | return err; | |
322 | } | |
323 | EXPORT_SYMBOL_GPL(scsi_dh_set_params); | |
324 | ||
ae11b1b3 | 325 | /* |
2a9ab40f | 326 | * scsi_dh_attach - Attach device handler |
7e8a74b1 MS |
327 | * @q - Request queue that is associated with the scsi_device |
328 | * the handler should be attached to | |
ae11b1b3 HR |
329 | * @name - name of the handler to attach |
330 | */ | |
331 | int scsi_dh_attach(struct request_queue *q, const char *name) | |
332 | { | |
ae11b1b3 HR |
333 | struct scsi_device *sdev; |
334 | struct scsi_device_handler *scsi_dh; | |
335 | int err = 0; | |
336 | ||
857de6e0 | 337 | sdev = scsi_device_from_queue(q); |
e959ed9a CH |
338 | if (!sdev) |
339 | return -ENODEV; | |
ae11b1b3 | 340 | |
e959ed9a CH |
341 | scsi_dh = scsi_dh_lookup(name); |
342 | if (!scsi_dh) { | |
343 | err = -EINVAL; | |
344 | goto out_put_device; | |
345 | } | |
ae11b1b3 | 346 | |
ee14c674 CH |
347 | if (sdev->handler) { |
348 | if (sdev->handler != scsi_dh) | |
1bab0de0 CH |
349 | err = -EBUSY; |
350 | goto out_put_device; | |
ae11b1b3 | 351 | } |
1bab0de0 CH |
352 | |
353 | err = scsi_dh_handler_attach(sdev, scsi_dh); | |
354 | ||
355 | out_put_device: | |
ae11b1b3 | 356 | put_device(&sdev->sdev_gendev); |
1bab0de0 | 357 | return err; |
ae11b1b3 | 358 | } |
1bab0de0 | 359 | EXPORT_SYMBOL_GPL(scsi_dh_attach); |
ae11b1b3 | 360 | |
7e8a74b1 MS |
361 | /* |
362 | * scsi_dh_attached_handler_name - Get attached device handler's name | |
363 | * @q - Request queue that is associated with the scsi_device | |
364 | * that may have a device handler attached | |
365 | * @gfp - the GFP mask used in the kmalloc() call when allocating memory | |
366 | * | |
367 | * Returns name of attached handler, NULL if no handler is attached. | |
368 | * Caller must take care to free the returned string. | |
369 | */ | |
370 | const char *scsi_dh_attached_handler_name(struct request_queue *q, gfp_t gfp) | |
371 | { | |
7e8a74b1 MS |
372 | struct scsi_device *sdev; |
373 | const char *handler_name = NULL; | |
374 | ||
857de6e0 | 375 | sdev = scsi_device_from_queue(q); |
7e8a74b1 MS |
376 | if (!sdev) |
377 | return NULL; | |
378 | ||
ee14c674 CH |
379 | if (sdev->handler) |
380 | handler_name = kstrdup(sdev->handler->name, gfp); | |
7e8a74b1 MS |
381 | put_device(&sdev->sdev_gendev); |
382 | return handler_name; | |
383 | } | |
384 | EXPORT_SYMBOL_GPL(scsi_dh_attached_handler_name); |