Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device.c | |
3 | * bus driver for ccw devices | |
1da177e4 | 4 | * |
c820de39 | 5 | * Copyright IBM Corp. 2002,2008 |
1da177e4 | 6 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) |
4ce3b30c | 7 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
8 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
9 | */ | |
a7ae2c02 PO |
10 | |
11 | #define KMSG_COMPONENT "cio" | |
12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
13 | ||
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/spinlock.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/workqueue.h> | |
90ab1336 | 23 | #include <linux/timer.h> |
1da177e4 LT |
24 | |
25 | #include <asm/ccwdev.h> | |
26 | #include <asm/cio.h> | |
4e57b681 | 27 | #include <asm/param.h> /* HZ */ |
1842f2b1 | 28 | #include <asm/cmb.h> |
3a3fc29a | 29 | #include <asm/isc.h> |
1da177e4 | 30 | |
0ae7a7b2 | 31 | #include "chp.h" |
1da177e4 | 32 | #include "cio.h" |
d7b5a4c9 | 33 | #include "cio_debug.h" |
1da177e4 LT |
34 | #include "css.h" |
35 | #include "device.h" | |
36 | #include "ioasm.h" | |
cd6b4f27 | 37 | #include "io_sch.h" |
ecf5d9ef | 38 | #include "blacklist.h" |
1da177e4 | 39 | |
90ab1336 | 40 | static struct timer_list recovery_timer; |
486d0a00 | 41 | static DEFINE_SPINLOCK(recovery_lock); |
90ab1336 PO |
42 | static int recovery_phase; |
43 | static const unsigned long recovery_delay[] = { 3, 30, 300 }; | |
44 | ||
1da177e4 LT |
45 | /******************* bus type handling ***********************/ |
46 | ||
47 | /* The Linux driver model distinguishes between a bus type and | |
48 | * the bus itself. Of course we only have one channel | |
49 | * subsystem driver and one channel system per machine, but | |
50 | * we still use the abstraction. T.R. says it's a good idea. */ | |
51 | static int | |
52 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
53 | { | |
54 | struct ccw_device *cdev = to_ccwdev(dev); | |
55 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
56 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
57 | ||
58 | if (!ids) | |
59 | return 0; | |
60 | ||
61 | found = ccw_device_id_match(ids, &cdev->id); | |
62 | if (!found) | |
63 | return 0; | |
64 | ||
65 | cdev->id.driver_info = found->driver_info; | |
66 | ||
67 | return 1; | |
68 | } | |
69 | ||
db0c2d59 PO |
70 | /* Store modalias string delimited by prefix/suffix string into buffer with |
71 | * specified size. Return length of resulting string (excluding trailing '\0') | |
72 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 73 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 74 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 75 | { |
db0c2d59 | 76 | int len; |
1da177e4 | 77 | |
cfbe9bb2 | 78 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
79 | if (len > size) |
80 | return len; | |
81 | buf += len; | |
82 | size -= len; | |
1da177e4 | 83 | |
db0c2d59 PO |
84 | if (id->dev_type != 0) |
85 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
86 | id->dev_model, suffix); | |
87 | else | |
88 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 89 | |
db0c2d59 PO |
90 | return len; |
91 | } | |
92 | ||
93 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
94 | * non-zero otherwise. */ | |
7eff2e7a | 95 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
96 | { |
97 | struct ccw_device *cdev = to_ccwdev(dev); | |
98 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
99 | int ret; |
100 | char modalias_buf[30]; | |
1da177e4 | 101 | |
db0c2d59 | 102 | /* CU_TYPE= */ |
7eff2e7a | 103 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
104 | if (ret) |
105 | return ret; | |
db0c2d59 PO |
106 | |
107 | /* CU_MODEL= */ | |
7eff2e7a | 108 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
109 | if (ret) |
110 | return ret; | |
1da177e4 LT |
111 | |
112 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 113 | /* DEV_TYPE= */ |
7eff2e7a | 114 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
115 | if (ret) |
116 | return ret; | |
1da177e4 | 117 | |
db0c2d59 | 118 | /* DEV_MODEL= */ |
7eff2e7a | 119 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
120 | if (ret) |
121 | return ret; | |
db0c2d59 PO |
122 | |
123 | /* MODALIAS= */ | |
cfbe9bb2 | 124 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
125 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
126 | return ret; | |
1da177e4 LT |
127 | } |
128 | ||
8bbace7e | 129 | struct bus_type ccw_bus_type; |
1da177e4 | 130 | |
602b20f2 CH |
131 | static void io_subchannel_irq(struct subchannel *); |
132 | static int io_subchannel_probe(struct subchannel *); | |
133 | static int io_subchannel_remove(struct subchannel *); | |
8bbace7e | 134 | static void io_subchannel_shutdown(struct subchannel *); |
c820de39 | 135 | static int io_subchannel_sch_event(struct subchannel *, int); |
99611f87 CH |
136 | static int io_subchannel_chp_event(struct subchannel *, struct chp_link *, |
137 | int); | |
8ea7f559 SO |
138 | static void recovery_func(unsigned long data); |
139 | struct workqueue_struct *ccw_device_work; | |
140 | wait_queue_head_t ccw_device_init_wq; | |
141 | atomic_t ccw_device_init_count; | |
1da177e4 | 142 | |
f08adc00 CH |
143 | static struct css_device_id io_subchannel_ids[] = { |
144 | { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, | |
145 | { /* end of list */ }, | |
146 | }; | |
147 | MODULE_DEVICE_TABLE(css, io_subchannel_ids); | |
148 | ||
93a27592 CH |
149 | static int io_subchannel_prepare(struct subchannel *sch) |
150 | { | |
151 | struct ccw_device *cdev; | |
152 | /* | |
153 | * Don't allow suspend while a ccw device registration | |
154 | * is still outstanding. | |
155 | */ | |
156 | cdev = sch_get_cdev(sch); | |
157 | if (cdev && !device_is_registered(&cdev->dev)) | |
158 | return -EAGAIN; | |
159 | return 0; | |
160 | } | |
161 | ||
8ea7f559 SO |
162 | static void io_subchannel_settle(void) |
163 | { | |
164 | wait_event(ccw_device_init_wq, | |
165 | atomic_read(&ccw_device_init_count) == 0); | |
166 | flush_workqueue(ccw_device_work); | |
167 | } | |
168 | ||
f7e5d67c | 169 | static struct css_driver io_subchannel_driver = { |
4beee646 | 170 | .owner = THIS_MODULE, |
f08adc00 | 171 | .subchannel_type = io_subchannel_ids, |
25b7bb58 | 172 | .name = "io_subchannel", |
1da177e4 | 173 | .irq = io_subchannel_irq, |
c820de39 CH |
174 | .sch_event = io_subchannel_sch_event, |
175 | .chp_event = io_subchannel_chp_event, | |
8bbace7e CH |
176 | .probe = io_subchannel_probe, |
177 | .remove = io_subchannel_remove, | |
178 | .shutdown = io_subchannel_shutdown, | |
93a27592 | 179 | .prepare = io_subchannel_prepare, |
8ea7f559 | 180 | .settle = io_subchannel_settle, |
1da177e4 LT |
181 | }; |
182 | ||
2f17644d | 183 | int __init io_subchannel_init(void) |
1da177e4 LT |
184 | { |
185 | int ret; | |
186 | ||
187 | init_waitqueue_head(&ccw_device_init_wq); | |
188 | atomic_set(&ccw_device_init_count, 0); | |
90ab1336 | 189 | setup_timer(&recovery_timer, recovery_func, 0); |
1da177e4 LT |
190 | |
191 | ccw_device_work = create_singlethread_workqueue("cio"); | |
192 | if (!ccw_device_work) | |
2f17644d | 193 | return -ENOMEM; |
1da177e4 LT |
194 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); |
195 | if (!slow_path_wq) { | |
2f17644d | 196 | ret = -ENOMEM; |
1da177e4 LT |
197 | goto out_err; |
198 | } | |
199 | if ((ret = bus_register (&ccw_bus_type))) | |
200 | goto out_err; | |
201 | ||
25b7bb58 CH |
202 | ret = css_driver_register(&io_subchannel_driver); |
203 | if (ret) | |
1da177e4 LT |
204 | goto out_err; |
205 | ||
1da177e4 LT |
206 | return 0; |
207 | out_err: | |
208 | if (ccw_device_work) | |
209 | destroy_workqueue(ccw_device_work); | |
1da177e4 LT |
210 | if (slow_path_wq) |
211 | destroy_workqueue(slow_path_wq); | |
212 | return ret; | |
213 | } | |
214 | ||
1da177e4 LT |
215 | |
216 | /************************ device handling **************************/ | |
217 | ||
218 | /* | |
219 | * A ccw_device has some interfaces in sysfs in addition to the | |
220 | * standard ones. | |
221 | * The following entries are designed to export the information which | |
222 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
223 | * are obvious, so they don't have an entry :) | |
224 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
225 | */ | |
226 | static ssize_t | |
3fd3c0a5 | 227 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
228 | { |
229 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 230 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
231 | ssize_t ret = 0; |
232 | int chp; | |
7ad6a249 PO |
233 | int mask; |
234 | ||
235 | for (chp = 0; chp < 8; chp++) { | |
236 | mask = 0x80 >> chp; | |
237 | if (ssd->path_mask & mask) | |
238 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
239 | else | |
240 | ret += sprintf(buf + ret, "00 "); | |
241 | } | |
1da177e4 LT |
242 | ret += sprintf (buf+ret, "\n"); |
243 | return min((ssize_t)PAGE_SIZE, ret); | |
244 | } | |
245 | ||
246 | static ssize_t | |
3fd3c0a5 | 247 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
248 | { |
249 | struct subchannel *sch = to_subchannel(dev); | |
250 | struct pmcw *pmcw = &sch->schib.pmcw; | |
251 | ||
252 | return sprintf (buf, "%02x %02x %02x\n", | |
253 | pmcw->pim, pmcw->pam, pmcw->pom); | |
254 | } | |
255 | ||
256 | static ssize_t | |
3fd3c0a5 | 257 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
258 | { |
259 | struct ccw_device *cdev = to_ccwdev(dev); | |
260 | struct ccw_device_id *id = &(cdev->id); | |
261 | ||
262 | if (id->dev_type != 0) | |
263 | return sprintf(buf, "%04x/%02x\n", | |
264 | id->dev_type, id->dev_model); | |
265 | else | |
266 | return sprintf(buf, "n/a\n"); | |
267 | } | |
268 | ||
269 | static ssize_t | |
3fd3c0a5 | 270 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
271 | { |
272 | struct ccw_device *cdev = to_ccwdev(dev); | |
273 | struct ccw_device_id *id = &(cdev->id); | |
274 | ||
275 | return sprintf(buf, "%04x/%02x\n", | |
276 | id->cu_type, id->cu_model); | |
277 | } | |
278 | ||
f1fc78a8 BB |
279 | static ssize_t |
280 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
281 | { | |
282 | struct ccw_device *cdev = to_ccwdev(dev); | |
283 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 284 | int len; |
f1fc78a8 | 285 | |
086a6c62 | 286 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
287 | |
288 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
289 | } |
290 | ||
1da177e4 | 291 | static ssize_t |
3fd3c0a5 | 292 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
293 | { |
294 | struct ccw_device *cdev = to_ccwdev(dev); | |
295 | ||
296 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
297 | } | |
298 | ||
d7b5a4c9 CH |
299 | int ccw_device_is_orphan(struct ccw_device *cdev) |
300 | { | |
301 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
302 | } | |
303 | ||
ef99516c | 304 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 305 | { |
3b554a14 | 306 | if (test_and_clear_bit(1, &cdev->private->registered)) { |
ef99516c | 307 | device_del(&cdev->dev); |
3b554a14 SO |
308 | /* Release reference from device_initialize(). */ |
309 | put_device(&cdev->dev); | |
310 | } | |
7674da77 CH |
311 | } |
312 | ||
b2ffd8e9 CH |
313 | /** |
314 | * ccw_device_set_offline() - disable a ccw device for I/O | |
315 | * @cdev: target ccw device | |
316 | * | |
317 | * This function calls the driver's set_offline() function for @cdev, if | |
318 | * given, and then disables @cdev. | |
319 | * Returns: | |
320 | * %0 on success and a negative error value on failure. | |
321 | * Context: | |
322 | * enabled, ccw device lock not held | |
323 | */ | |
324 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 LT |
325 | { |
326 | int ret; | |
327 | ||
328 | if (!cdev) | |
329 | return -ENODEV; | |
330 | if (!cdev->online || !cdev->drv) | |
331 | return -EINVAL; | |
332 | ||
333 | if (cdev->drv->set_offline) { | |
334 | ret = cdev->drv->set_offline(cdev); | |
335 | if (ret != 0) | |
336 | return ret; | |
337 | } | |
338 | cdev->online = 0; | |
339 | spin_lock_irq(cdev->ccwlock); | |
217ee6c6 ME |
340 | /* Wait until a final state or DISCONNECTED is reached */ |
341 | while (!dev_fsm_final_state(cdev) && | |
342 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
1da177e4 | 343 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
344 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
345 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
346 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 | 347 | } |
217ee6c6 ME |
348 | ret = ccw_device_offline(cdev); |
349 | if (ret) | |
350 | goto error; | |
1da177e4 | 351 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
352 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
353 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
a7ae2c02 PO |
354 | /* Inform the user if set offline failed. */ |
355 | if (cdev->private->state == DEV_STATE_BOXED) { | |
356 | pr_warning("%s: The device entered boxed state while " | |
357 | "being set offline\n", dev_name(&cdev->dev)); | |
358 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
359 | pr_warning("%s: The device stopped operating while " | |
360 | "being set offline\n", dev_name(&cdev->dev)); | |
361 | } | |
217ee6c6 ME |
362 | /* Give up reference from ccw_device_set_online(). */ |
363 | put_device(&cdev->dev); | |
364 | return 0; | |
365 | ||
366 | error: | |
367 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device 0.%x.%04x\n", | |
368 | ret, cdev->private->dev_id.ssid, | |
369 | cdev->private->dev_id.devno); | |
370 | cdev->private->state = DEV_STATE_OFFLINE; | |
371 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
372 | spin_unlock_irq(cdev->ccwlock); | |
373 | /* Give up reference from ccw_device_set_online(). */ | |
374 | put_device(&cdev->dev); | |
375 | return -ENODEV; | |
1da177e4 LT |
376 | } |
377 | ||
b2ffd8e9 CH |
378 | /** |
379 | * ccw_device_set_online() - enable a ccw device for I/O | |
380 | * @cdev: target ccw device | |
381 | * | |
382 | * This function first enables @cdev and then calls the driver's set_online() | |
383 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
384 | * disabled again. | |
385 | * Returns: | |
386 | * %0 on success and a negative error value on failure. | |
387 | * Context: | |
388 | * enabled, ccw device lock not held | |
389 | */ | |
390 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
391 | { |
392 | int ret; | |
217ee6c6 | 393 | int ret2; |
1da177e4 LT |
394 | |
395 | if (!cdev) | |
396 | return -ENODEV; | |
397 | if (cdev->online || !cdev->drv) | |
398 | return -EINVAL; | |
9cd67421 CH |
399 | /* Hold on to an extra reference while device is online. */ |
400 | if (!get_device(&cdev->dev)) | |
401 | return -ENODEV; | |
1da177e4 LT |
402 | |
403 | spin_lock_irq(cdev->ccwlock); | |
404 | ret = ccw_device_online(cdev); | |
405 | spin_unlock_irq(cdev->ccwlock); | |
406 | if (ret == 0) | |
407 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
408 | else { | |
139b83dd | 409 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
410 | "device 0.%x.%04x\n", |
411 | ret, cdev->private->dev_id.ssid, | |
412 | cdev->private->dev_id.devno); | |
9cd67421 CH |
413 | /* Give up online reference since onlining failed. */ |
414 | put_device(&cdev->dev); | |
1da177e4 LT |
415 | return ret; |
416 | } | |
217ee6c6 ME |
417 | spin_lock_irq(cdev->ccwlock); |
418 | /* Check if online processing was successful */ | |
419 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
420 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
421 | spin_unlock_irq(cdev->ccwlock); | |
a7ae2c02 PO |
422 | /* Inform the user that set online failed. */ |
423 | if (cdev->private->state == DEV_STATE_BOXED) { | |
424 | pr_warning("%s: Setting the device online failed " | |
425 | "because it is boxed\n", | |
426 | dev_name(&cdev->dev)); | |
427 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
428 | pr_warning("%s: Setting the device online failed " | |
429 | "because it is not operational\n", | |
430 | dev_name(&cdev->dev)); | |
431 | } | |
9cd67421 CH |
432 | /* Give up online reference since onlining failed. */ |
433 | put_device(&cdev->dev); | |
1da177e4 | 434 | return -ENODEV; |
9cd67421 | 435 | } |
217ee6c6 ME |
436 | spin_unlock_irq(cdev->ccwlock); |
437 | if (cdev->drv->set_online) | |
438 | ret = cdev->drv->set_online(cdev); | |
439 | if (ret) | |
440 | goto rollback; | |
441 | cdev->online = 1; | |
442 | return 0; | |
443 | ||
444 | rollback: | |
1da177e4 | 445 | spin_lock_irq(cdev->ccwlock); |
217ee6c6 ME |
446 | /* Wait until a final state or DISCONNECTED is reached */ |
447 | while (!dev_fsm_final_state(cdev) && | |
448 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
449 | spin_unlock_irq(cdev->ccwlock); | |
450 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
451 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
452 | spin_lock_irq(cdev->ccwlock); | |
453 | } | |
454 | ret2 = ccw_device_offline(cdev); | |
455 | if (ret2) | |
456 | goto error; | |
457 | spin_unlock_irq(cdev->ccwlock); | |
458 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
459 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
460 | /* Give up online reference since onlining failed. */ | |
461 | put_device(&cdev->dev); | |
462 | return ret; | |
463 | ||
464 | error: | |
465 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
466 | "device 0.%x.%04x\n", | |
467 | ret2, cdev->private->dev_id.ssid, | |
468 | cdev->private->dev_id.devno); | |
469 | cdev->private->state = DEV_STATE_OFFLINE; | |
1da177e4 | 470 | spin_unlock_irq(cdev->ccwlock); |
9cd67421 CH |
471 | /* Give up online reference since onlining failed. */ |
472 | put_device(&cdev->dev); | |
217ee6c6 | 473 | return ret; |
1da177e4 LT |
474 | } |
475 | ||
e74fe0ce | 476 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 | 477 | { |
37de53bb PO |
478 | if (cdev->private->state == DEV_STATE_DISCONNECTED) { |
479 | spin_lock_irq(cdev->ccwlock); | |
480 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); | |
481 | spin_unlock_irq(cdev->ccwlock); | |
482 | } else if (cdev->online && cdev->drv && cdev->drv->set_offline) | |
e74fe0ce SO |
483 | return ccw_device_set_offline(cdev); |
484 | return 0; | |
f5ba6c86 CH |
485 | } |
486 | ||
487 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
488 | { | |
f5ba6c86 | 489 | /* Do device recognition, if needed. */ |
99f6a570 | 490 | if (cdev->private->state == DEV_STATE_BOXED) { |
1f5bd384 | 491 | spin_lock_irq(cdev->ccwlock); |
736b5db8 | 492 | ccw_device_recognition(cdev); |
1f5bd384 | 493 | spin_unlock_irq(cdev->ccwlock); |
f5ba6c86 CH |
494 | wait_event(cdev->private->wait_q, |
495 | cdev->private->flags.recog_done); | |
156013ff SO |
496 | if (cdev->private->state != DEV_STATE_OFFLINE) |
497 | /* recognition failed */ | |
498 | return -EAGAIN; | |
f5ba6c86 CH |
499 | } |
500 | if (cdev->drv && cdev->drv->set_online) | |
501 | ccw_device_set_online(cdev); | |
502 | return 0; | |
503 | } | |
156013ff | 504 | |
c78aa6cb | 505 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
506 | { |
507 | int ret; | |
508 | ||
509 | ret = online_store_recog_and_online(cdev); | |
156013ff | 510 | if (ret && !force) |
c78aa6cb | 511 | return ret; |
f5ba6c86 CH |
512 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
513 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
514 | if (ret) |
515 | return ret; | |
f5ba6c86 CH |
516 | if (cdev->id.cu_type == 0) |
517 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
518 | ret = online_store_recog_and_online(cdev); |
519 | if (ret) | |
520 | return ret; | |
f5ba6c86 | 521 | } |
c78aa6cb | 522 | return 0; |
f5ba6c86 CH |
523 | } |
524 | ||
525 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
526 | const char *buf, size_t count) | |
1da177e4 LT |
527 | { |
528 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
529 | int force, ret; |
530 | unsigned long i; | |
1da177e4 | 531 | |
350e9120 PO |
532 | if (!dev_fsm_final_state(cdev) && |
533 | cdev->private->state != DEV_STATE_DISCONNECTED) | |
534 | return -EAGAIN; | |
535 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) | |
1da177e4 LT |
536 | return -EAGAIN; |
537 | ||
538 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
539 | atomic_set(&cdev->private->onoff, 0); | |
540 | return -EINVAL; | |
541 | } | |
542 | if (!strncmp(buf, "force\n", count)) { | |
543 | force = 1; | |
544 | i = 1; | |
2f972202 | 545 | ret = 0; |
1da177e4 LT |
546 | } else { |
547 | force = 0; | |
2f972202 | 548 | ret = strict_strtoul(buf, 16, &i); |
1da177e4 | 549 | } |
2f972202 CH |
550 | if (ret) |
551 | goto out; | |
f5ba6c86 CH |
552 | switch (i) { |
553 | case 0: | |
e74fe0ce | 554 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
555 | break; |
556 | case 1: | |
c78aa6cb | 557 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
558 | break; |
559 | default: | |
2f972202 | 560 | ret = -EINVAL; |
1da177e4 | 561 | } |
2f972202 | 562 | out: |
1da177e4 LT |
563 | if (cdev->drv) |
564 | module_put(cdev->drv->owner); | |
565 | atomic_set(&cdev->private->onoff, 0); | |
e74fe0ce | 566 | return (ret < 0) ? ret : count; |
1da177e4 LT |
567 | } |
568 | ||
569 | static ssize_t | |
3fd3c0a5 | 570 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
571 | { |
572 | struct ccw_device *cdev = to_ccwdev(dev); | |
573 | struct subchannel *sch; | |
574 | ||
d7b5a4c9 CH |
575 | if (ccw_device_is_orphan(cdev)) |
576 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
577 | switch (cdev->private->state) { |
578 | case DEV_STATE_BOXED: | |
579 | return sprintf(buf, "boxed\n"); | |
580 | case DEV_STATE_DISCONNECTED: | |
581 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
582 | case DEV_STATE_NOT_OPER: | |
583 | sch = to_subchannel(dev->parent); | |
584 | if (!sch->lpm) | |
585 | return sprintf(buf, "no path\n"); | |
586 | else | |
587 | return sprintf(buf, "no device\n"); | |
588 | default: | |
589 | /* All other states considered fine. */ | |
590 | return sprintf(buf, "good\n"); | |
591 | } | |
592 | } | |
593 | ||
594 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
595 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
596 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
597 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 598 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 599 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 LT |
600 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
601 | ||
7e9db9ea | 602 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
603 | &dev_attr_chpids.attr, |
604 | &dev_attr_pimpampom.attr, | |
605 | NULL, | |
606 | }; | |
607 | ||
7e9db9ea CH |
608 | static struct attribute_group io_subchannel_attr_group = { |
609 | .attrs = io_subchannel_attrs, | |
529192f3 | 610 | }; |
1da177e4 LT |
611 | |
612 | static struct attribute * ccwdev_attrs[] = { | |
613 | &dev_attr_devtype.attr, | |
614 | &dev_attr_cutype.attr, | |
f1fc78a8 | 615 | &dev_attr_modalias.attr, |
1da177e4 LT |
616 | &dev_attr_online.attr, |
617 | &dev_attr_cmb_enable.attr, | |
618 | &dev_attr_availability.attr, | |
619 | NULL, | |
620 | }; | |
621 | ||
622 | static struct attribute_group ccwdev_attr_group = { | |
623 | .attrs = ccwdev_attrs, | |
624 | }; | |
625 | ||
a4dbd674 | 626 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
627 | &ccwdev_attr_group, |
628 | NULL, | |
629 | }; | |
1da177e4 LT |
630 | |
631 | /* this is a simple abstraction for device_register that sets the | |
632 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 633 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
634 | { |
635 | struct device *dev = &cdev->dev; | |
636 | int ret; | |
637 | ||
638 | dev->bus = &ccw_bus_type; | |
3ac276f8 SO |
639 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
640 | cdev->private->dev_id.devno); | |
641 | if (ret) | |
642 | return ret; | |
643 | ret = device_add(dev); | |
644 | if (ret) | |
1da177e4 LT |
645 | return ret; |
646 | ||
647 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
648 | return ret; |
649 | } | |
650 | ||
5d6e6b6f | 651 | static int match_dev_id(struct device *dev, void *data) |
b0744bd2 | 652 | { |
5d6e6b6f PO |
653 | struct ccw_device *cdev = to_ccwdev(dev); |
654 | struct ccw_dev_id *dev_id = data; | |
d7b5a4c9 | 655 | |
d7b5a4c9 CH |
656 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); |
657 | } | |
658 | ||
5d6e6b6f | 659 | static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id) |
d7b5a4c9 CH |
660 | { |
661 | struct device *dev; | |
662 | ||
5d6e6b6f | 663 | dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id); |
d7b5a4c9 CH |
664 | |
665 | return dev ? to_ccwdev(dev) : NULL; | |
666 | } | |
667 | ||
37de53bb | 668 | static void ccw_device_do_unbind_bind(struct ccw_device *cdev) |
1da177e4 | 669 | { |
eb32ae8d | 670 | int ret; |
1da177e4 | 671 | |
eb32ae8d CH |
672 | if (test_bit(1, &cdev->private->registered)) { |
673 | device_release_driver(&cdev->dev); | |
674 | ret = device_attach(&cdev->dev); | |
675 | WARN_ON(ret == -ENODEV); | |
676 | } | |
1da177e4 LT |
677 | } |
678 | ||
679 | static void | |
680 | ccw_device_release(struct device *dev) | |
681 | { | |
682 | struct ccw_device *cdev; | |
683 | ||
684 | cdev = to_ccwdev(dev); | |
6eff208f CH |
685 | /* Release reference of parent subchannel. */ |
686 | put_device(cdev->dev.parent); | |
1da177e4 LT |
687 | kfree(cdev->private); |
688 | kfree(cdev); | |
689 | } | |
690 | ||
7674da77 CH |
691 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
692 | { | |
693 | struct ccw_device *cdev; | |
694 | ||
695 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
696 | if (cdev) { | |
697 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
698 | GFP_KERNEL | GFP_DMA); | |
699 | if (cdev->private) | |
700 | return cdev; | |
701 | } | |
702 | kfree(cdev); | |
703 | return ERR_PTR(-ENOMEM); | |
704 | } | |
705 | ||
37de53bb PO |
706 | static void ccw_device_todo(struct work_struct *work); |
707 | ||
7674da77 CH |
708 | static int io_subchannel_initialize_dev(struct subchannel *sch, |
709 | struct ccw_device *cdev) | |
710 | { | |
711 | cdev->private->cdev = cdev; | |
712 | atomic_set(&cdev->private->onoff, 0); | |
713 | cdev->dev.parent = &sch->dev; | |
714 | cdev->dev.release = ccw_device_release; | |
37de53bb | 715 | INIT_WORK(&cdev->private->todo_work, ccw_device_todo); |
ef99516c | 716 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
717 | /* Do first half of device_register. */ |
718 | device_initialize(&cdev->dev); | |
719 | if (!get_device(&sch->dev)) { | |
283fdd0b CH |
720 | /* Release reference from device_initialize(). */ |
721 | put_device(&cdev->dev); | |
7674da77 CH |
722 | return -ENODEV; |
723 | } | |
724 | return 0; | |
725 | } | |
726 | ||
727 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
728 | { | |
729 | struct ccw_device *cdev; | |
730 | int ret; | |
731 | ||
732 | cdev = io_subchannel_allocate_dev(sch); | |
733 | if (!IS_ERR(cdev)) { | |
734 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 735 | if (ret) |
7674da77 | 736 | cdev = ERR_PTR(ret); |
7674da77 CH |
737 | } |
738 | return cdev; | |
739 | } | |
740 | ||
736b5db8 | 741 | static void io_subchannel_recog(struct ccw_device *, struct subchannel *); |
d7b5a4c9 | 742 | |
d7b5a4c9 CH |
743 | static void sch_create_and_recog_new_device(struct subchannel *sch) |
744 | { | |
745 | struct ccw_device *cdev; | |
746 | ||
747 | /* Need to allocate a new ccw device. */ | |
748 | cdev = io_subchannel_create_ccwdev(sch); | |
749 | if (IS_ERR(cdev)) { | |
750 | /* OK, we did everything we could... */ | |
751 | css_sch_device_unregister(sch); | |
752 | return; | |
753 | } | |
d7b5a4c9 | 754 | /* Start recognition for the new ccw device. */ |
736b5db8 | 755 | io_subchannel_recog(cdev, sch); |
d7b5a4c9 CH |
756 | } |
757 | ||
1da177e4 LT |
758 | /* |
759 | * Register recognized device. | |
760 | */ | |
37de53bb | 761 | static void io_subchannel_register(struct ccw_device *cdev) |
1da177e4 | 762 | { |
1da177e4 LT |
763 | struct subchannel *sch; |
764 | int ret; | |
765 | unsigned long flags; | |
766 | ||
1da177e4 | 767 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
768 | /* |
769 | * Check if subchannel is still registered. It may have become | |
770 | * unregistered if a machine check hit us after finishing | |
771 | * device recognition but before the register work could be | |
772 | * queued. | |
773 | */ | |
774 | if (!device_is_registered(&sch->dev)) | |
775 | goto out_err; | |
82b7ac05 | 776 | css_update_ssd_info(sch); |
47af5518 CH |
777 | /* |
778 | * io_subchannel_register() will also be called after device | |
779 | * recognition has been done for a boxed device (which will already | |
780 | * be registered). We need to reprobe since we may now have sense id | |
781 | * information. | |
782 | */ | |
d6a30761 | 783 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
784 | if (!cdev->drv) { |
785 | ret = device_reprobe(&cdev->dev); | |
786 | if (ret) | |
787 | /* We can't do much here. */ | |
139b83dd | 788 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
789 | " %d for 0.%x.%04x\n", ret, |
790 | cdev->private->dev_id.ssid, | |
791 | cdev->private->dev_id.devno); | |
47af5518 | 792 | } |
1da177e4 LT |
793 | goto out; |
794 | } | |
fa1a8c23 CH |
795 | /* |
796 | * Now we know this subchannel will stay, we can throw | |
797 | * our delayed uevent. | |
798 | */ | |
f67f129e | 799 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 800 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 LT |
801 | /* make it known to the system */ |
802 | ret = ccw_device_register(cdev); | |
803 | if (ret) { | |
e556bbbd CH |
804 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
805 | cdev->private->dev_id.ssid, | |
806 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 807 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 808 | sch_set_cdev(sch, NULL); |
2ec22984 | 809 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
810 | /* Release initial device reference. */ |
811 | put_device(&cdev->dev); | |
5fb6b854 | 812 | goto out_err; |
1da177e4 | 813 | } |
1da177e4 LT |
814 | out: |
815 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 816 | wake_up(&cdev->private->wait_q); |
5fb6b854 | 817 | out_err: |
1da177e4 LT |
818 | if (atomic_dec_and_test(&ccw_device_init_count)) |
819 | wake_up(&ccw_device_init_wq); | |
820 | } | |
821 | ||
37de53bb | 822 | static void ccw_device_call_sch_unregister(struct ccw_device *cdev) |
1da177e4 | 823 | { |
1da177e4 LT |
824 | struct subchannel *sch; |
825 | ||
46fbe4e4 PO |
826 | /* Get subchannel reference for local processing. */ |
827 | if (!get_device(cdev->dev.parent)) | |
828 | return; | |
1da177e4 | 829 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 830 | css_sch_device_unregister(sch); |
46fbe4e4 | 831 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
832 | put_device(&sch->dev); |
833 | } | |
834 | ||
835 | /* | |
836 | * subchannel recognition done. Called from the state machine. | |
837 | */ | |
838 | void | |
839 | io_subchannel_recog_done(struct ccw_device *cdev) | |
840 | { | |
1da177e4 LT |
841 | if (css_init_done == 0) { |
842 | cdev->private->flags.recog_done = 1; | |
843 | return; | |
844 | } | |
845 | switch (cdev->private->state) { | |
47593bfa SO |
846 | case DEV_STATE_BOXED: |
847 | /* Device did not respond in time. */ | |
1da177e4 LT |
848 | case DEV_STATE_NOT_OPER: |
849 | cdev->private->flags.recog_done = 1; | |
37de53bb PO |
850 | /* Remove device found not operational. */ |
851 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1da177e4 LT |
852 | if (atomic_dec_and_test(&ccw_device_init_count)) |
853 | wake_up(&ccw_device_init_wq); | |
854 | break; | |
1da177e4 LT |
855 | case DEV_STATE_OFFLINE: |
856 | /* | |
857 | * We can't register the device in interrupt context so | |
858 | * we schedule a work item. | |
859 | */ | |
37de53bb | 860 | ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER); |
1da177e4 LT |
861 | break; |
862 | } | |
863 | } | |
864 | ||
736b5db8 | 865 | static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) |
1da177e4 | 866 | { |
1da177e4 LT |
867 | struct ccw_device_private *priv; |
868 | ||
2ec22984 | 869 | cdev->ccwlock = sch->lock; |
fb6958a5 | 870 | |
1da177e4 LT |
871 | /* Init private data. */ |
872 | priv = cdev->private; | |
78964268 CH |
873 | priv->dev_id.devno = sch->schib.pmcw.dev; |
874 | priv->dev_id.ssid = sch->schid.ssid; | |
875 | priv->schid = sch->schid; | |
1da177e4 LT |
876 | priv->state = DEV_STATE_NOT_OPER; |
877 | INIT_LIST_HEAD(&priv->cmb_list); | |
878 | init_waitqueue_head(&priv->wait_q); | |
879 | init_timer(&priv->timer); | |
880 | ||
1da177e4 LT |
881 | /* Increase counter of devices currently in recognition. */ |
882 | atomic_inc(&ccw_device_init_count); | |
883 | ||
884 | /* Start async. device sensing. */ | |
2ec22984 | 885 | spin_lock_irq(sch->lock); |
60e4dac1 | 886 | sch_set_cdev(sch, cdev); |
736b5db8 | 887 | ccw_device_recognition(cdev); |
2ec22984 | 888 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
889 | } |
890 | ||
5d6e6b6f PO |
891 | static int ccw_device_move_to_sch(struct ccw_device *cdev, |
892 | struct subchannel *sch) | |
d7b5a4c9 | 893 | { |
5d6e6b6f | 894 | struct subchannel *old_sch; |
d7b5a4c9 | 895 | int rc; |
d7b5a4c9 | 896 | |
5d6e6b6f PO |
897 | old_sch = to_subchannel(cdev->dev.parent); |
898 | /* Obtain child reference for new parent. */ | |
6eff208f | 899 | if (!get_device(&sch->dev)) |
5d6e6b6f | 900 | return -ENODEV; |
d7b5a4c9 | 901 | mutex_lock(&sch->reg_mutex); |
ffa6a705 | 902 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
903 | mutex_unlock(&sch->reg_mutex); |
904 | if (rc) { | |
5d6e6b6f | 905 | CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", |
d7b5a4c9 CH |
906 | cdev->private->dev_id.ssid, |
907 | cdev->private->dev_id.devno, sch->schid.ssid, | |
5d6e6b6f PO |
908 | sch->schib.pmcw.dev, rc); |
909 | /* Release child reference for new parent. */ | |
6eff208f | 910 | put_device(&sch->dev); |
5d6e6b6f | 911 | return rc; |
d7b5a4c9 | 912 | } |
5d6e6b6f PO |
913 | /* Clean up old subchannel. */ |
914 | if (!sch_is_pseudo_sch(old_sch)) { | |
915 | spin_lock_irq(old_sch->lock); | |
916 | sch_set_cdev(old_sch, NULL); | |
917 | cio_disable_subchannel(old_sch); | |
918 | spin_unlock_irq(old_sch->lock); | |
919 | css_schedule_eval(old_sch->schid); | |
d7b5a4c9 | 920 | } |
5d6e6b6f PO |
921 | /* Release child reference for old parent. */ |
922 | put_device(&old_sch->dev); | |
923 | /* Initialize new subchannel. */ | |
924 | spin_lock_irq(sch->lock); | |
925 | cdev->private->schid = sch->schid; | |
926 | cdev->ccwlock = sch->lock; | |
927 | if (!sch_is_pseudo_sch(sch)) | |
928 | sch_set_cdev(sch, cdev); | |
929 | spin_unlock_irq(sch->lock); | |
930 | if (!sch_is_pseudo_sch(sch)) | |
931 | css_update_ssd_info(sch); | |
932 | return 0; | |
933 | } | |
934 | ||
935 | static int ccw_device_move_to_orph(struct ccw_device *cdev) | |
936 | { | |
937 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
938 | struct channel_subsystem *css = to_css(sch->dev.parent); | |
939 | ||
940 | return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); | |
d7b5a4c9 CH |
941 | } |
942 | ||
602b20f2 CH |
943 | static void io_subchannel_irq(struct subchannel *sch) |
944 | { | |
945 | struct ccw_device *cdev; | |
946 | ||
db6a6423 | 947 | cdev = sch_get_cdev(sch); |
602b20f2 | 948 | |
efd986db SO |
949 | CIO_TRACE_EVENT(6, "IRQ"); |
950 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
951 | if (cdev) |
952 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
953 | } | |
954 | ||
13952ec1 SO |
955 | void io_subchannel_init_config(struct subchannel *sch) |
956 | { | |
957 | memset(&sch->config, 0, sizeof(sch->config)); | |
958 | sch->config.csense = 1; | |
13952ec1 SO |
959 | } |
960 | ||
0ae7a7b2 CH |
961 | static void io_subchannel_init_fields(struct subchannel *sch) |
962 | { | |
963 | if (cio_is_console(sch->schid)) | |
964 | sch->opm = 0xff; | |
965 | else | |
966 | sch->opm = chp_get_sch_opm(sch); | |
967 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 968 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
969 | |
970 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
971 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
972 | sch->schib.pmcw.dev, sch->schid.ssid, | |
973 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
974 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
975 | |
976 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
977 | } |
978 | ||
90ed2b69 CH |
979 | /* |
980 | * Note: We always return 0 so that we bind to the device even on error. | |
981 | * This is needed so that our remove function is called on unregister. | |
982 | */ | |
0ae7a7b2 | 983 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 984 | { |
1da177e4 LT |
985 | struct ccw_device *cdev; |
986 | int rc; | |
1da177e4 | 987 | |
6d7c5afc | 988 | if (cio_is_console(sch->schid)) { |
7e9db9ea CH |
989 | rc = sysfs_create_group(&sch->dev.kobj, |
990 | &io_subchannel_attr_group); | |
991 | if (rc) | |
992 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
993 | "attributes for subchannel " | |
994 | "0.%x.%04x (rc=%d)\n", | |
995 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 | 996 | /* |
6d7c5afc | 997 | * The console subchannel already has an associated ccw_device. |
7e9db9ea | 998 | * Throw the delayed uevent for the subchannel, register |
6d7c5afc | 999 | * the ccw_device and exit. |
1da177e4 | 1000 | */ |
f67f129e | 1001 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1002 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
6d7c5afc | 1003 | cdev = sch_get_cdev(sch); |
e1031786 | 1004 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 LT |
1005 | device_initialize(&cdev->dev); |
1006 | ccw_device_register(cdev); | |
1da177e4 LT |
1007 | /* |
1008 | * Check if the device is already online. If it is | |
9cd67421 CH |
1009 | * the reference count needs to be corrected since we |
1010 | * didn't obtain a reference in ccw_device_set_online. | |
1da177e4 LT |
1011 | */ |
1012 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1013 | cdev->private->state != DEV_STATE_OFFLINE && | |
1014 | cdev->private->state != DEV_STATE_BOXED) | |
1015 | get_device(&cdev->dev); | |
1016 | return 0; | |
1017 | } | |
0ae7a7b2 | 1018 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1019 | rc = cio_commit_config(sch); |
1020 | if (rc) | |
1021 | goto out_schedule; | |
7e9db9ea CH |
1022 | rc = sysfs_create_group(&sch->dev.kobj, |
1023 | &io_subchannel_attr_group); | |
1024 | if (rc) | |
90ed2b69 | 1025 | goto out_schedule; |
cd6b4f27 CH |
1026 | /* Allocate I/O subchannel private data. */ |
1027 | sch->private = kzalloc(sizeof(struct io_subchannel_private), | |
1028 | GFP_KERNEL | GFP_DMA); | |
90ed2b69 | 1029 | if (!sch->private) |
48e4c385 | 1030 | goto out_schedule; |
5d6e6b6f | 1031 | css_schedule_eval(sch->schid); |
7e9db9ea | 1032 | return 0; |
48e4c385 | 1033 | |
90ed2b69 | 1034 | out_schedule: |
390935ac PO |
1035 | spin_lock_irq(sch->lock); |
1036 | css_sched_sch_todo(sch, SCH_TODO_UNREG); | |
1037 | spin_unlock_irq(sch->lock); | |
90ed2b69 | 1038 | return 0; |
1da177e4 LT |
1039 | } |
1040 | ||
1da177e4 | 1041 | static int |
8bbace7e | 1042 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1043 | { |
1044 | struct ccw_device *cdev; | |
1045 | unsigned long flags; | |
1046 | ||
db6a6423 CH |
1047 | cdev = sch_get_cdev(sch); |
1048 | if (!cdev) | |
48e4c385 | 1049 | goto out_free; |
1da177e4 LT |
1050 | /* Set ccw device to not operational and drop reference. */ |
1051 | spin_lock_irqsave(cdev->ccwlock, flags); | |
db6a6423 | 1052 | sch_set_cdev(sch, NULL); |
1da177e4 LT |
1053 | cdev->private->state = DEV_STATE_NOT_OPER; |
1054 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
ef99516c | 1055 | ccw_device_unregister(cdev); |
48e4c385 | 1056 | out_free: |
cd6b4f27 | 1057 | kfree(sch->private); |
7e9db9ea | 1058 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1059 | return 0; |
1060 | } | |
1061 | ||
602b20f2 | 1062 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1063 | { |
1064 | struct ccw_device *cdev; | |
1065 | ||
db6a6423 | 1066 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1067 | if (cdev) |
1068 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1069 | } | |
1070 | ||
c820de39 CH |
1071 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1072 | { | |
1073 | struct ccw_device *cdev; | |
1074 | ||
1075 | cdev = sch_get_cdev(sch); | |
1076 | if (!cdev) | |
1077 | return; | |
4257aaec PO |
1078 | if (cio_update_schib(sch)) |
1079 | goto err; | |
1080 | /* Check for I/O on path. */ | |
1081 | if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask) | |
1082 | goto out; | |
1083 | if (cdev->private->state == DEV_STATE_ONLINE) { | |
1084 | ccw_device_kill_io(cdev); | |
1085 | goto out; | |
1086 | } | |
1087 | if (cio_clear(sch)) | |
1088 | goto err; | |
1089 | out: | |
1090 | /* Trigger path verification. */ | |
1091 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1092 | return; | |
c820de39 | 1093 | |
4257aaec PO |
1094 | err: |
1095 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
c820de39 CH |
1096 | } |
1097 | ||
99611f87 CH |
1098 | static int io_subchannel_chp_event(struct subchannel *sch, |
1099 | struct chp_link *link, int event) | |
c820de39 CH |
1100 | { |
1101 | int mask; | |
c820de39 | 1102 | |
99611f87 | 1103 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1104 | if (!mask) |
1105 | return 0; | |
1106 | switch (event) { | |
1107 | case CHP_VARY_OFF: | |
1108 | sch->opm &= ~mask; | |
1109 | sch->lpm &= ~mask; | |
1110 | io_subchannel_terminate_path(sch, mask); | |
1111 | break; | |
1112 | case CHP_VARY_ON: | |
1113 | sch->opm |= mask; | |
1114 | sch->lpm |= mask; | |
1115 | io_subchannel_verify(sch); | |
1116 | break; | |
1117 | case CHP_OFFLINE: | |
cdb912a4 | 1118 | if (cio_update_schib(sch)) |
c820de39 CH |
1119 | return -ENODEV; |
1120 | io_subchannel_terminate_path(sch, mask); | |
1121 | break; | |
1122 | case CHP_ONLINE: | |
cdb912a4 SO |
1123 | if (cio_update_schib(sch)) |
1124 | return -ENODEV; | |
c820de39 CH |
1125 | sch->lpm |= mask & sch->opm; |
1126 | io_subchannel_verify(sch); | |
1127 | break; | |
1128 | } | |
1129 | return 0; | |
1130 | } | |
1131 | ||
1da177e4 | 1132 | static void |
8bbace7e | 1133 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 1134 | { |
1da177e4 LT |
1135 | struct ccw_device *cdev; |
1136 | int ret; | |
1137 | ||
db6a6423 | 1138 | cdev = sch_get_cdev(sch); |
1da177e4 | 1139 | |
a8237fc4 | 1140 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
1141 | return; |
1142 | if (!sch->schib.pmcw.ena) | |
1143 | /* Nothing to do. */ | |
1144 | return; | |
1145 | ret = cio_disable_subchannel(sch); | |
1146 | if (ret != -EBUSY) | |
1147 | /* Subchannel is disabled, we're done. */ | |
1148 | return; | |
1149 | cdev->private->state = DEV_STATE_QUIESCE; | |
1150 | if (cdev->handler) | |
1151 | cdev->handler(cdev, cdev->private->intparm, | |
1152 | ERR_PTR(-EIO)); | |
1153 | ret = ccw_device_cancel_halt_clear(cdev); | |
1154 | if (ret == -EBUSY) { | |
1155 | ccw_device_set_timeout(cdev, HZ/10); | |
1156 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1157 | } | |
1158 | cio_disable_subchannel(sch); | |
1159 | } | |
1160 | ||
c820de39 CH |
1161 | static int device_is_disconnected(struct ccw_device *cdev) |
1162 | { | |
1163 | if (!cdev) | |
1164 | return 0; | |
1165 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1166 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1167 | } | |
1168 | ||
1169 | static int recovery_check(struct device *dev, void *data) | |
1170 | { | |
1171 | struct ccw_device *cdev = to_ccwdev(dev); | |
1172 | int *redo = data; | |
1173 | ||
1174 | spin_lock_irq(cdev->ccwlock); | |
1175 | switch (cdev->private->state) { | |
1176 | case DEV_STATE_DISCONNECTED: | |
1177 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1178 | cdev->private->dev_id.ssid, | |
1179 | cdev->private->dev_id.devno); | |
1180 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1181 | *redo = 1; | |
1182 | break; | |
1183 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1184 | *redo = 1; | |
1185 | break; | |
1186 | } | |
1187 | spin_unlock_irq(cdev->ccwlock); | |
1188 | ||
1189 | return 0; | |
1190 | } | |
1191 | ||
1192 | static void recovery_work_func(struct work_struct *unused) | |
1193 | { | |
1194 | int redo = 0; | |
1195 | ||
1196 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1197 | if (redo) { | |
1198 | spin_lock_irq(&recovery_lock); | |
1199 | if (!timer_pending(&recovery_timer)) { | |
1200 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1201 | recovery_phase++; | |
1202 | mod_timer(&recovery_timer, jiffies + | |
1203 | recovery_delay[recovery_phase] * HZ); | |
1204 | } | |
1205 | spin_unlock_irq(&recovery_lock); | |
1206 | } else | |
1207 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1208 | } | |
1209 | ||
1210 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1211 | ||
1212 | static void recovery_func(unsigned long data) | |
1213 | { | |
1214 | /* | |
1215 | * We can't do our recovery in softirq context and it's not | |
1216 | * performance critical, so we schedule it. | |
1217 | */ | |
1218 | schedule_work(&recovery_work); | |
1219 | } | |
1220 | ||
1221 | static void ccw_device_schedule_recovery(void) | |
1222 | { | |
1223 | unsigned long flags; | |
1224 | ||
1225 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1226 | spin_lock_irqsave(&recovery_lock, flags); | |
1227 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1228 | recovery_phase = 0; | |
1229 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1230 | } | |
1231 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1232 | } | |
1233 | ||
ecf5d9ef PO |
1234 | static int purge_fn(struct device *dev, void *data) |
1235 | { | |
1236 | struct ccw_device *cdev = to_ccwdev(dev); | |
37de53bb | 1237 | struct ccw_dev_id *id = &cdev->private->dev_id; |
ecf5d9ef PO |
1238 | |
1239 | spin_lock_irq(cdev->ccwlock); | |
37de53bb PO |
1240 | if (is_blacklisted(id->ssid, id->devno) && |
1241 | (cdev->private->state == DEV_STATE_OFFLINE)) { | |
1242 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid, | |
1243 | id->devno); | |
1244 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1245 | } | |
ecf5d9ef | 1246 | spin_unlock_irq(cdev->ccwlock); |
ecf5d9ef PO |
1247 | /* Abort loop in case of pending signal. */ |
1248 | if (signal_pending(current)) | |
1249 | return -EINTR; | |
1250 | ||
1251 | return 0; | |
1252 | } | |
1253 | ||
1254 | /** | |
1255 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1256 | * | |
1257 | * Unregister all ccw devices that are offline and on the blacklist. | |
1258 | */ | |
1259 | int ccw_purge_blacklisted(void) | |
1260 | { | |
1261 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1262 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1263 | return 0; | |
1264 | } | |
1265 | ||
6afcc775 | 1266 | void ccw_device_set_disconnected(struct ccw_device *cdev) |
c820de39 CH |
1267 | { |
1268 | if (!cdev) | |
1269 | return; | |
1270 | ccw_device_set_timeout(cdev, 0); | |
1271 | cdev->private->flags.fake_irb = 0; | |
1272 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1273 | if (cdev->online) | |
1274 | ccw_device_schedule_recovery(); | |
1275 | } | |
1276 | ||
91c36919 PO |
1277 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1278 | { | |
1279 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1280 | ||
1281 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1282 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1283 | ccw_device_set_timeout(cdev, 0); |
1284 | cio_disable_subchannel(sch); | |
1285 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1286 | } | |
1287 | ||
5d6e6b6f PO |
1288 | enum io_sch_action { |
1289 | IO_SCH_UNREG, | |
1290 | IO_SCH_ORPH_UNREG, | |
1291 | IO_SCH_ATTACH, | |
1292 | IO_SCH_UNREG_ATTACH, | |
1293 | IO_SCH_ORPH_ATTACH, | |
1294 | IO_SCH_REPROBE, | |
1295 | IO_SCH_VERIFY, | |
1296 | IO_SCH_DISC, | |
1297 | IO_SCH_NOP, | |
1298 | }; | |
1299 | ||
1300 | static enum io_sch_action sch_get_action(struct subchannel *sch) | |
1301 | { | |
1302 | struct ccw_device *cdev; | |
1303 | ||
1304 | cdev = sch_get_cdev(sch); | |
1305 | if (cio_update_schib(sch)) { | |
1306 | /* Not operational. */ | |
1307 | if (!cdev) | |
1308 | return IO_SCH_UNREG; | |
1309 | if (!ccw_device_notify(cdev, CIO_GONE)) | |
1310 | return IO_SCH_UNREG; | |
1311 | return IO_SCH_ORPH_UNREG; | |
1312 | } | |
1313 | /* Operational. */ | |
1314 | if (!cdev) | |
1315 | return IO_SCH_ATTACH; | |
1316 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1317 | if (!ccw_device_notify(cdev, CIO_GONE)) | |
1318 | return IO_SCH_UNREG_ATTACH; | |
1319 | return IO_SCH_ORPH_ATTACH; | |
1320 | } | |
1321 | if ((sch->schib.pmcw.pam & sch->opm) == 0) { | |
1322 | if (!ccw_device_notify(cdev, CIO_NO_PATH)) | |
1323 | return IO_SCH_UNREG; | |
1324 | return IO_SCH_DISC; | |
1325 | } | |
1326 | if (device_is_disconnected(cdev)) | |
1327 | return IO_SCH_REPROBE; | |
1328 | if (cdev->online) | |
1329 | return IO_SCH_VERIFY; | |
1330 | return IO_SCH_NOP; | |
1331 | } | |
1332 | ||
1333 | /** | |
1334 | * io_subchannel_sch_event - process subchannel event | |
1335 | * @sch: subchannel | |
1336 | * @process: non-zero if function is called in process context | |
1337 | * | |
1338 | * An unspecified event occurred for this subchannel. Adjust data according | |
1339 | * to the current operational state of the subchannel and device. Return | |
1340 | * zero when the event has been handled sufficiently or -EAGAIN when this | |
1341 | * function should be called again in process context. | |
1342 | */ | |
1343 | static int io_subchannel_sch_event(struct subchannel *sch, int process) | |
c820de39 | 1344 | { |
c820de39 | 1345 | unsigned long flags; |
c820de39 | 1346 | struct ccw_device *cdev; |
5d6e6b6f PO |
1347 | struct ccw_dev_id dev_id; |
1348 | enum io_sch_action action; | |
1349 | int rc = -EAGAIN; | |
c820de39 CH |
1350 | |
1351 | spin_lock_irqsave(sch->lock, flags); | |
5d6e6b6f PO |
1352 | if (!device_is_registered(&sch->dev)) |
1353 | goto out_unlock; | |
390935ac PO |
1354 | if (work_pending(&sch->todo_work)) |
1355 | goto out_unlock; | |
37de53bb PO |
1356 | cdev = sch_get_cdev(sch); |
1357 | if (cdev && work_pending(&cdev->private->todo_work)) | |
1358 | goto out_unlock; | |
5d6e6b6f PO |
1359 | action = sch_get_action(sch); |
1360 | CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", | |
1361 | sch->schid.ssid, sch->schid.sch_no, process, | |
1362 | action); | |
1363 | /* Perform immediate actions while holding the lock. */ | |
5d6e6b6f PO |
1364 | switch (action) { |
1365 | case IO_SCH_REPROBE: | |
1366 | /* Trigger device recognition. */ | |
1367 | ccw_device_trigger_reprobe(cdev); | |
1368 | rc = 0; | |
1369 | goto out_unlock; | |
1370 | case IO_SCH_VERIFY: | |
1371 | /* Trigger path verification. */ | |
1372 | io_subchannel_verify(sch); | |
1373 | rc = 0; | |
1374 | goto out_unlock; | |
1375 | case IO_SCH_DISC: | |
1376 | ccw_device_set_disconnected(cdev); | |
1377 | rc = 0; | |
1378 | goto out_unlock; | |
1379 | case IO_SCH_ORPH_UNREG: | |
1380 | case IO_SCH_ORPH_ATTACH: | |
1381 | ccw_device_set_disconnected(cdev); | |
1382 | break; | |
1383 | case IO_SCH_UNREG_ATTACH: | |
1384 | case IO_SCH_UNREG: | |
1385 | if (cdev) | |
1386 | ccw_device_set_notoper(cdev); | |
1387 | break; | |
1388 | case IO_SCH_NOP: | |
1389 | rc = 0; | |
1390 | goto out_unlock; | |
1391 | default: | |
1392 | break; | |
c820de39 | 1393 | } |
5d6e6b6f PO |
1394 | spin_unlock_irqrestore(sch->lock, flags); |
1395 | /* All other actions require process context. */ | |
1396 | if (!process) | |
1397 | goto out; | |
1398 | /* Handle attached ccw device. */ | |
1399 | switch (action) { | |
1400 | case IO_SCH_ORPH_UNREG: | |
1401 | case IO_SCH_ORPH_ATTACH: | |
1402 | /* Move ccw device to orphanage. */ | |
1403 | rc = ccw_device_move_to_orph(cdev); | |
1404 | if (rc) | |
1405 | goto out; | |
c820de39 | 1406 | break; |
5d6e6b6f PO |
1407 | case IO_SCH_UNREG_ATTACH: |
1408 | /* Unregister ccw device. */ | |
1409 | ccw_device_unregister(cdev); | |
c820de39 | 1410 | break; |
5d6e6b6f | 1411 | default: |
c820de39 CH |
1412 | break; |
1413 | } | |
5d6e6b6f | 1414 | /* Handle subchannel. */ |
c820de39 | 1415 | switch (action) { |
5d6e6b6f PO |
1416 | case IO_SCH_ORPH_UNREG: |
1417 | case IO_SCH_UNREG: | |
c820de39 | 1418 | css_sch_device_unregister(sch); |
c820de39 | 1419 | break; |
5d6e6b6f PO |
1420 | case IO_SCH_ORPH_ATTACH: |
1421 | case IO_SCH_UNREG_ATTACH: | |
1422 | case IO_SCH_ATTACH: | |
1423 | dev_id.ssid = sch->schid.ssid; | |
1424 | dev_id.devno = sch->schib.pmcw.dev; | |
1425 | cdev = get_ccwdev_by_dev_id(&dev_id); | |
1426 | if (!cdev) { | |
1427 | sch_create_and_recog_new_device(sch); | |
1428 | break; | |
1429 | } | |
1430 | rc = ccw_device_move_to_sch(cdev, sch); | |
1431 | if (rc) { | |
1432 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1433 | put_device(&cdev->dev); | |
1434 | goto out; | |
1435 | } | |
1436 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 | 1437 | ccw_device_trigger_reprobe(cdev); |
5d6e6b6f PO |
1438 | spin_unlock_irqrestore(sch->lock, flags); |
1439 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1440 | put_device(&cdev->dev); | |
91c36919 | 1441 | break; |
c820de39 CH |
1442 | default: |
1443 | break; | |
1444 | } | |
5d6e6b6f | 1445 | return 0; |
c820de39 | 1446 | |
5d6e6b6f PO |
1447 | out_unlock: |
1448 | spin_unlock_irqrestore(sch->lock, flags); | |
1449 | out: | |
1450 | return rc; | |
c820de39 CH |
1451 | } |
1452 | ||
1da177e4 LT |
1453 | #ifdef CONFIG_CCW_CONSOLE |
1454 | static struct ccw_device console_cdev; | |
1455 | static struct ccw_device_private console_private; | |
1456 | static int console_cdev_in_use; | |
1457 | ||
2ec22984 CH |
1458 | static DEFINE_SPINLOCK(ccw_console_lock); |
1459 | ||
1460 | spinlock_t * cio_get_console_lock(void) | |
1461 | { | |
1462 | return &ccw_console_lock; | |
1463 | } | |
1464 | ||
0ae7a7b2 CH |
1465 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1466 | struct subchannel *sch) | |
1da177e4 LT |
1467 | { |
1468 | int rc; | |
1469 | ||
cd6b4f27 CH |
1470 | /* Attach subchannel private data. */ |
1471 | sch->private = cio_get_console_priv(); | |
1472 | memset(sch->private, 0, sizeof(struct io_subchannel_private)); | |
0ae7a7b2 | 1473 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1474 | rc = cio_commit_config(sch); |
1475 | if (rc) | |
1476 | return rc; | |
0ae7a7b2 | 1477 | sch->driver = &io_subchannel_driver; |
1da177e4 | 1478 | /* Initialize the ccw_device structure. */ |
292888c8 | 1479 | cdev->dev.parent= &sch->dev; |
736b5db8 | 1480 | io_subchannel_recog(cdev, sch); |
1da177e4 LT |
1481 | /* Now wait for the async. recognition to come to an end. */ |
1482 | spin_lock_irq(cdev->ccwlock); | |
1483 | while (!dev_fsm_final_state(cdev)) | |
1484 | wait_cons_dev(); | |
1485 | rc = -EIO; | |
1486 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1487 | goto out_unlock; | |
1488 | ccw_device_online(cdev); | |
1489 | while (!dev_fsm_final_state(cdev)) | |
1490 | wait_cons_dev(); | |
1491 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1492 | goto out_unlock; | |
1493 | rc = 0; | |
1494 | out_unlock: | |
1495 | spin_unlock_irq(cdev->ccwlock); | |
736b5db8 | 1496 | return rc; |
1da177e4 LT |
1497 | } |
1498 | ||
1499 | struct ccw_device * | |
1500 | ccw_device_probe_console(void) | |
1501 | { | |
1502 | struct subchannel *sch; | |
1503 | int ret; | |
1504 | ||
1505 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1506 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1507 | sch = cio_probe_console(); |
1508 | if (IS_ERR(sch)) { | |
1509 | console_cdev_in_use = 0; | |
1510 | return (void *) sch; | |
1511 | } | |
1512 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1513 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1514 | console_cdev.private = &console_private; | |
c1637532 | 1515 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1516 | ret = ccw_device_console_enable(&console_cdev, sch); |
1517 | if (ret) { | |
1518 | cio_release_console(); | |
1519 | console_cdev_in_use = 0; | |
1520 | return ERR_PTR(ret); | |
1521 | } | |
1522 | console_cdev.online = 1; | |
1523 | return &console_cdev; | |
1524 | } | |
1f4e7eda | 1525 | |
6664845c MS |
1526 | static int ccw_device_pm_restore(struct device *dev); |
1527 | ||
1528 | int ccw_device_force_console(void) | |
1529 | { | |
1530 | if (!console_cdev_in_use) | |
1531 | return -ENODEV; | |
1532 | return ccw_device_pm_restore(&console_cdev.dev); | |
1533 | } | |
1534 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1535 | #endif |
1536 | ||
1537 | /* | |
1538 | * get ccw_device matching the busid, but only if owned by cdrv | |
1539 | */ | |
b0744bd2 CH |
1540 | static int |
1541 | __ccwdev_check_busid(struct device *dev, void *id) | |
1542 | { | |
1543 | char *bus_id; | |
1544 | ||
12975aef | 1545 | bus_id = id; |
b0744bd2 | 1546 | |
98df67b3 | 1547 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1548 | } |
1549 | ||
1550 | ||
b2ffd8e9 CH |
1551 | /** |
1552 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1553 | * @cdrv: driver the device is owned by | |
1554 | * @bus_id: bus id of the device to be searched | |
1555 | * | |
1556 | * This function searches all devices owned by @cdrv for a device with a bus | |
1557 | * id matching @bus_id. | |
1558 | * Returns: | |
1559 | * If a match is found, its reference count of the found device is increased | |
1560 | * and it is returned; else %NULL is returned. | |
1561 | */ | |
1562 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1563 | const char *bus_id) | |
1da177e4 | 1564 | { |
b0744bd2 | 1565 | struct device *dev; |
1da177e4 LT |
1566 | struct device_driver *drv; |
1567 | ||
1568 | drv = get_driver(&cdrv->driver); | |
1569 | if (!drv) | |
b0744bd2 | 1570 | return NULL; |
1da177e4 | 1571 | |
b0744bd2 CH |
1572 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1573 | __ccwdev_check_busid); | |
1da177e4 LT |
1574 | put_driver(drv); |
1575 | ||
d2c993d8 | 1576 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1577 | } |
1578 | ||
1579 | /************************** device driver handling ************************/ | |
1580 | ||
1581 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1582 | * and release methods are initially very similar to the device_driver | |
1583 | * implementations, with the difference that they have ccw_device | |
1584 | * arguments. | |
1585 | * | |
1586 | * A ccw driver also contains the information that is needed for | |
1587 | * device matching. | |
1588 | */ | |
1589 | static int | |
1590 | ccw_device_probe (struct device *dev) | |
1591 | { | |
1592 | struct ccw_device *cdev = to_ccwdev(dev); | |
1593 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1594 | int ret; | |
1595 | ||
1596 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1597 | ||
1598 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1599 | ||
1600 | if (ret) { | |
d2c993d8 | 1601 | cdev->drv = NULL; |
1da177e4 LT |
1602 | return ret; |
1603 | } | |
1604 | ||
1605 | return 0; | |
1606 | } | |
1607 | ||
1608 | static int | |
1609 | ccw_device_remove (struct device *dev) | |
1610 | { | |
1611 | struct ccw_device *cdev = to_ccwdev(dev); | |
1612 | struct ccw_driver *cdrv = cdev->drv; | |
1613 | int ret; | |
1614 | ||
1da177e4 LT |
1615 | if (cdrv->remove) |
1616 | cdrv->remove(cdev); | |
1617 | if (cdev->online) { | |
1618 | cdev->online = 0; | |
1619 | spin_lock_irq(cdev->ccwlock); | |
1620 | ret = ccw_device_offline(cdev); | |
1621 | spin_unlock_irq(cdev->ccwlock); | |
1622 | if (ret == 0) | |
1623 | wait_event(cdev->private->wait_q, | |
1624 | dev_fsm_final_state(cdev)); | |
1625 | else | |
139b83dd | 1626 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1627 | "device 0.%x.%04x\n", |
1628 | ret, cdev->private->dev_id.ssid, | |
1629 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1630 | /* Give up reference obtained in ccw_device_set_online(). */ |
1631 | put_device(&cdev->dev); | |
1da177e4 LT |
1632 | } |
1633 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1634 | cdev->drv = NULL; |
1da177e4 LT |
1635 | return 0; |
1636 | } | |
1637 | ||
958974fb CH |
1638 | static void ccw_device_shutdown(struct device *dev) |
1639 | { | |
1640 | struct ccw_device *cdev; | |
1641 | ||
1642 | cdev = to_ccwdev(dev); | |
1643 | if (cdev->drv && cdev->drv->shutdown) | |
1644 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1645 | disable_cmf(cdev); |
958974fb CH |
1646 | } |
1647 | ||
823d494a SO |
1648 | static int ccw_device_pm_prepare(struct device *dev) |
1649 | { | |
1650 | struct ccw_device *cdev = to_ccwdev(dev); | |
1651 | ||
37de53bb | 1652 | if (work_pending(&cdev->private->todo_work)) |
823d494a SO |
1653 | return -EAGAIN; |
1654 | /* Fail while device is being set online/offline. */ | |
1655 | if (atomic_read(&cdev->private->onoff)) | |
1656 | return -EAGAIN; | |
1657 | ||
1658 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1659 | return cdev->drv->prepare(cdev); | |
1660 | ||
1661 | return 0; | |
1662 | } | |
1663 | ||
1664 | static void ccw_device_pm_complete(struct device *dev) | |
1665 | { | |
1666 | struct ccw_device *cdev = to_ccwdev(dev); | |
1667 | ||
1668 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1669 | cdev->drv->complete(cdev); | |
1670 | } | |
1671 | ||
1672 | static int ccw_device_pm_freeze(struct device *dev) | |
1673 | { | |
1674 | struct ccw_device *cdev = to_ccwdev(dev); | |
1675 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1676 | int ret, cm_enabled; | |
1677 | ||
1678 | /* Fail suspend while device is in transistional state. */ | |
1679 | if (!dev_fsm_final_state(cdev)) | |
1680 | return -EAGAIN; | |
1681 | if (!cdev->online) | |
1682 | return 0; | |
1683 | if (cdev->drv && cdev->drv->freeze) { | |
1684 | ret = cdev->drv->freeze(cdev); | |
1685 | if (ret) | |
1686 | return ret; | |
1687 | } | |
1688 | ||
1689 | spin_lock_irq(sch->lock); | |
1690 | cm_enabled = cdev->private->cmb != NULL; | |
1691 | spin_unlock_irq(sch->lock); | |
1692 | if (cm_enabled) { | |
1693 | /* Don't have the css write on memory. */ | |
1694 | ret = ccw_set_cmf(cdev, 0); | |
1695 | if (ret) | |
1696 | return ret; | |
1697 | } | |
1698 | /* From here on, disallow device driver I/O. */ | |
1699 | spin_lock_irq(sch->lock); | |
1700 | ret = cio_disable_subchannel(sch); | |
1701 | spin_unlock_irq(sch->lock); | |
1702 | ||
1703 | return ret; | |
1704 | } | |
1705 | ||
1706 | static int ccw_device_pm_thaw(struct device *dev) | |
1707 | { | |
1708 | struct ccw_device *cdev = to_ccwdev(dev); | |
1709 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1710 | int ret, cm_enabled; | |
1711 | ||
1712 | if (!cdev->online) | |
1713 | return 0; | |
1714 | ||
1715 | spin_lock_irq(sch->lock); | |
1716 | /* Allow device driver I/O again. */ | |
1717 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1718 | cm_enabled = cdev->private->cmb != NULL; | |
1719 | spin_unlock_irq(sch->lock); | |
1720 | if (ret) | |
1721 | return ret; | |
1722 | ||
1723 | if (cm_enabled) { | |
1724 | ret = ccw_set_cmf(cdev, 1); | |
1725 | if (ret) | |
1726 | return ret; | |
1727 | } | |
1728 | ||
1729 | if (cdev->drv && cdev->drv->thaw) | |
1730 | ret = cdev->drv->thaw(cdev); | |
1731 | ||
1732 | return ret; | |
1733 | } | |
1734 | ||
1735 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
1736 | { | |
1737 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
823d494a SO |
1738 | |
1739 | if (cio_is_console(sch->schid)) | |
1740 | goto out; | |
1741 | /* | |
1742 | * While we were sleeping, devices may have gone or become | |
1743 | * available again. Kick re-detection. | |
1744 | */ | |
1745 | spin_lock_irq(sch->lock); | |
1746 | cdev->private->flags.resuming = 1; | |
736b5db8 | 1747 | ccw_device_recognition(cdev); |
823d494a | 1748 | spin_unlock_irq(sch->lock); |
823d494a SO |
1749 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || |
1750 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
823d494a SO |
1751 | out: |
1752 | cdev->private->flags.resuming = 0; | |
1753 | } | |
1754 | ||
1755 | static int resume_handle_boxed(struct ccw_device *cdev) | |
1756 | { | |
1757 | cdev->private->state = DEV_STATE_BOXED; | |
1758 | if (ccw_device_notify(cdev, CIO_BOXED)) | |
1759 | return 0; | |
37de53bb | 1760 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1761 | return -ENODEV; |
1762 | } | |
1763 | ||
1764 | static int resume_handle_disc(struct ccw_device *cdev) | |
1765 | { | |
1766 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1767 | if (ccw_device_notify(cdev, CIO_GONE)) | |
1768 | return 0; | |
37de53bb | 1769 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1770 | return -ENODEV; |
1771 | } | |
1772 | ||
1773 | static int ccw_device_pm_restore(struct device *dev) | |
1774 | { | |
1775 | struct ccw_device *cdev = to_ccwdev(dev); | |
1776 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1777 | int ret = 0, cm_enabled; | |
1778 | ||
1779 | __ccw_device_pm_restore(cdev); | |
1780 | spin_lock_irq(sch->lock); | |
1781 | if (cio_is_console(sch->schid)) { | |
1782 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1783 | spin_unlock_irq(sch->lock); | |
1784 | goto out_restore; | |
1785 | } | |
1786 | cdev->private->flags.donotify = 0; | |
1787 | /* check recognition results */ | |
1788 | switch (cdev->private->state) { | |
1789 | case DEV_STATE_OFFLINE: | |
1790 | break; | |
1791 | case DEV_STATE_BOXED: | |
1792 | ret = resume_handle_boxed(cdev); | |
1793 | spin_unlock_irq(sch->lock); | |
1794 | if (ret) | |
1795 | goto out; | |
1796 | goto out_restore; | |
1797 | case DEV_STATE_DISCONNECTED: | |
1798 | goto out_disc_unlock; | |
1799 | default: | |
1800 | goto out_unreg_unlock; | |
1801 | } | |
1802 | /* check if the device id has changed */ | |
1803 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
f014824e SO |
1804 | CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno " |
1805 | "changed from %04x to %04x)\n", | |
1806 | sch->schid.ssid, sch->schid.sch_no, | |
823d494a SO |
1807 | cdev->private->dev_id.devno, |
1808 | sch->schib.pmcw.dev); | |
1809 | goto out_unreg_unlock; | |
1810 | } | |
1811 | /* check if the device type has changed */ | |
1812 | if (!ccw_device_test_sense_data(cdev)) { | |
1813 | ccw_device_update_sense_data(cdev); | |
37de53bb | 1814 | ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); |
823d494a SO |
1815 | ret = -ENODEV; |
1816 | goto out_unlock; | |
1817 | } | |
1818 | if (!cdev->online) { | |
1819 | ret = 0; | |
1820 | goto out_unlock; | |
1821 | } | |
1822 | ret = ccw_device_online(cdev); | |
1823 | if (ret) | |
1824 | goto out_disc_unlock; | |
1825 | ||
1826 | cm_enabled = cdev->private->cmb != NULL; | |
1827 | spin_unlock_irq(sch->lock); | |
1828 | ||
1829 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1830 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
1831 | spin_lock_irq(sch->lock); | |
1832 | goto out_disc_unlock; | |
1833 | } | |
1834 | if (cm_enabled) { | |
1835 | ret = ccw_set_cmf(cdev, 1); | |
1836 | if (ret) { | |
f014824e SO |
1837 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
1838 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
1839 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
1840 | ret = 0; |
1841 | } | |
1842 | } | |
1843 | ||
1844 | out_restore: | |
1845 | if (cdev->online && cdev->drv && cdev->drv->restore) | |
1846 | ret = cdev->drv->restore(cdev); | |
1847 | out: | |
1848 | return ret; | |
1849 | ||
1850 | out_disc_unlock: | |
1851 | ret = resume_handle_disc(cdev); | |
1852 | spin_unlock_irq(sch->lock); | |
1853 | if (ret) | |
1854 | return ret; | |
1855 | goto out_restore; | |
1856 | ||
1857 | out_unreg_unlock: | |
37de53bb | 1858 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); |
823d494a SO |
1859 | ret = -ENODEV; |
1860 | out_unlock: | |
1861 | spin_unlock_irq(sch->lock); | |
1862 | return ret; | |
1863 | } | |
1864 | ||
1865 | static struct dev_pm_ops ccw_pm_ops = { | |
1866 | .prepare = ccw_device_pm_prepare, | |
1867 | .complete = ccw_device_pm_complete, | |
1868 | .freeze = ccw_device_pm_freeze, | |
1869 | .thaw = ccw_device_pm_thaw, | |
1870 | .restore = ccw_device_pm_restore, | |
1871 | }; | |
1872 | ||
8bbace7e CH |
1873 | struct bus_type ccw_bus_type = { |
1874 | .name = "ccw", | |
1875 | .match = ccw_bus_match, | |
1876 | .uevent = ccw_uevent, | |
1877 | .probe = ccw_device_probe, | |
1878 | .remove = ccw_device_remove, | |
958974fb | 1879 | .shutdown = ccw_device_shutdown, |
823d494a | 1880 | .pm = &ccw_pm_ops, |
8bbace7e CH |
1881 | }; |
1882 | ||
b2ffd8e9 CH |
1883 | /** |
1884 | * ccw_driver_register() - register a ccw driver | |
1885 | * @cdriver: driver to be registered | |
1886 | * | |
1887 | * This function is mainly a wrapper around driver_register(). | |
1888 | * Returns: | |
1889 | * %0 on success and a negative error value on failure. | |
1890 | */ | |
1891 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
1892 | { |
1893 | struct device_driver *drv = &cdriver->driver; | |
1894 | ||
1895 | drv->bus = &ccw_bus_type; | |
1896 | drv->name = cdriver->name; | |
4beee646 | 1897 | drv->owner = cdriver->owner; |
1da177e4 LT |
1898 | |
1899 | return driver_register(drv); | |
1900 | } | |
1901 | ||
b2ffd8e9 CH |
1902 | /** |
1903 | * ccw_driver_unregister() - deregister a ccw driver | |
1904 | * @cdriver: driver to be deregistered | |
1905 | * | |
1906 | * This function is mainly a wrapper around driver_unregister(). | |
1907 | */ | |
1908 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
1909 | { |
1910 | driver_unregister(&cdriver->driver); | |
1911 | } | |
1912 | ||
a8237fc4 CH |
1913 | /* Helper func for qdio. */ |
1914 | struct subchannel_id | |
1915 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1916 | { | |
1917 | struct subchannel *sch; | |
1918 | ||
1919 | sch = to_subchannel(cdev->dev.parent); | |
1920 | return sch->schid; | |
1921 | } | |
1922 | ||
37de53bb PO |
1923 | static void ccw_device_todo(struct work_struct *work) |
1924 | { | |
1925 | struct ccw_device_private *priv; | |
1926 | struct ccw_device *cdev; | |
1927 | struct subchannel *sch; | |
1928 | enum cdev_todo todo; | |
1929 | ||
1930 | priv = container_of(work, struct ccw_device_private, todo_work); | |
1931 | cdev = priv->cdev; | |
1932 | sch = to_subchannel(cdev->dev.parent); | |
1933 | /* Find out todo. */ | |
1934 | spin_lock_irq(cdev->ccwlock); | |
1935 | todo = priv->todo; | |
1936 | priv->todo = CDEV_TODO_NOTHING; | |
1937 | CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n", | |
1938 | priv->dev_id.ssid, priv->dev_id.devno, todo); | |
1939 | spin_unlock_irq(cdev->ccwlock); | |
1940 | /* Perform todo. */ | |
1941 | switch (todo) { | |
1942 | case CDEV_TODO_ENABLE_CMF: | |
1943 | cmf_reenable(cdev); | |
1944 | break; | |
1945 | case CDEV_TODO_REBIND: | |
1946 | ccw_device_do_unbind_bind(cdev); | |
1947 | break; | |
1948 | case CDEV_TODO_REGISTER: | |
1949 | io_subchannel_register(cdev); | |
1950 | break; | |
1951 | case CDEV_TODO_UNREG_EVAL: | |
1952 | if (!sch_is_pseudo_sch(sch)) | |
1953 | css_schedule_eval(sch->schid); | |
1954 | /* fall-through */ | |
1955 | case CDEV_TODO_UNREG: | |
1956 | if (sch_is_pseudo_sch(sch)) | |
1957 | ccw_device_unregister(cdev); | |
1958 | else | |
1959 | ccw_device_call_sch_unregister(cdev); | |
1960 | break; | |
1961 | default: | |
1962 | break; | |
1963 | } | |
1964 | /* Release workqueue ref. */ | |
1965 | put_device(&cdev->dev); | |
1966 | } | |
1967 | ||
1968 | /** | |
1969 | * ccw_device_sched_todo - schedule ccw device operation | |
1970 | * @cdev: ccw device | |
1971 | * @todo: todo | |
1972 | * | |
1973 | * Schedule the operation identified by @todo to be performed on the slow path | |
1974 | * workqueue. Do nothing if another operation with higher priority is already | |
1975 | * scheduled. Needs to be called with ccwdev lock held. | |
1976 | */ | |
1977 | void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo) | |
1978 | { | |
1979 | CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n", | |
1980 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
1981 | todo); | |
1982 | if (cdev->private->todo >= todo) | |
1983 | return; | |
1984 | cdev->private->todo = todo; | |
1985 | /* Get workqueue ref. */ | |
1986 | if (!get_device(&cdev->dev)) | |
1987 | return; | |
1988 | if (!queue_work(slow_path_wq, &cdev->private->todo_work)) { | |
1989 | /* Already queued, release workqueue ref. */ | |
1990 | put_device(&cdev->dev); | |
1991 | } | |
1992 | } | |
1993 | ||
1da177e4 LT |
1994 | MODULE_LICENSE("GPL"); |
1995 | EXPORT_SYMBOL(ccw_device_set_online); | |
1996 | EXPORT_SYMBOL(ccw_device_set_offline); | |
1997 | EXPORT_SYMBOL(ccw_driver_register); | |
1998 | EXPORT_SYMBOL(ccw_driver_unregister); | |
1999 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
2000 | EXPORT_SYMBOL(ccw_bus_type); | |
2001 | EXPORT_SYMBOL(ccw_device_work); | |
a8237fc4 | 2002 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |