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1 | // SPDX-License-Identifier: GPL-1.0+ | |
2 | /* | |
3 | * bus driver for ccw devices | |
4 | * | |
5 | * Copyright IBM Corp. 2002, 2008 | |
6 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) | |
7 | * Cornelia Huck (cornelia.huck@de.ibm.com) | |
8 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
9 | */ | |
10 | ||
11 | #define KMSG_COMPONENT "cio" | |
12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
13 | ||
14 | #include <linux/export.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> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/timer.h> | |
25 | #include <linux/kernel_stat.h> | |
26 | #include <linux/sched/signal.h> | |
27 | #include <linux/dma-mapping.h> | |
28 | ||
29 | #include <asm/ccwdev.h> | |
30 | #include <asm/cio.h> | |
31 | #include <asm/param.h> /* HZ */ | |
32 | #include <asm/cmb.h> | |
33 | #include <asm/isc.h> | |
34 | ||
35 | #include "chp.h" | |
36 | #include "cio.h" | |
37 | #include "cio_debug.h" | |
38 | #include "css.h" | |
39 | #include "device.h" | |
40 | #include "ioasm.h" | |
41 | #include "io_sch.h" | |
42 | #include "blacklist.h" | |
43 | #include "chsc.h" | |
44 | ||
45 | static struct timer_list recovery_timer; | |
46 | static DEFINE_SPINLOCK(recovery_lock); | |
47 | static int recovery_phase; | |
48 | static const unsigned long recovery_delay[] = { 3, 30, 300 }; | |
49 | ||
50 | static atomic_t ccw_device_init_count = ATOMIC_INIT(0); | |
51 | static DECLARE_WAIT_QUEUE_HEAD(ccw_device_init_wq); | |
52 | static struct bus_type ccw_bus_type; | |
53 | ||
54 | /******************* bus type handling ***********************/ | |
55 | ||
56 | /* The Linux driver model distinguishes between a bus type and | |
57 | * the bus itself. Of course we only have one channel | |
58 | * subsystem driver and one channel system per machine, but | |
59 | * we still use the abstraction. T.R. says it's a good idea. */ | |
60 | static int | |
61 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
62 | { | |
63 | struct ccw_device *cdev = to_ccwdev(dev); | |
64 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
65 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
66 | ||
67 | if (!ids) | |
68 | return 0; | |
69 | ||
70 | found = ccw_device_id_match(ids, &cdev->id); | |
71 | if (!found) | |
72 | return 0; | |
73 | ||
74 | cdev->id.driver_info = found->driver_info; | |
75 | ||
76 | return 1; | |
77 | } | |
78 | ||
79 | /* Store modalias string delimited by prefix/suffix string into buffer with | |
80 | * specified size. Return length of resulting string (excluding trailing '\0') | |
81 | * even if string doesn't fit buffer (snprintf semantics). */ | |
82 | static int snprint_alias(char *buf, size_t size, | |
83 | struct ccw_device_id *id, const char *suffix) | |
84 | { | |
85 | int len; | |
86 | ||
87 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); | |
88 | if (len > size) | |
89 | return len; | |
90 | buf += len; | |
91 | size -= len; | |
92 | ||
93 | if (id->dev_type != 0) | |
94 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
95 | id->dev_model, suffix); | |
96 | else | |
97 | len += snprintf(buf, size, "dtdm%s", suffix); | |
98 | ||
99 | return len; | |
100 | } | |
101 | ||
102 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
103 | * non-zero otherwise. */ | |
104 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) | |
105 | { | |
106 | struct ccw_device *cdev = to_ccwdev(dev); | |
107 | struct ccw_device_id *id = &(cdev->id); | |
108 | int ret; | |
109 | char modalias_buf[30]; | |
110 | ||
111 | /* CU_TYPE= */ | |
112 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); | |
113 | if (ret) | |
114 | return ret; | |
115 | ||
116 | /* CU_MODEL= */ | |
117 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); | |
118 | if (ret) | |
119 | return ret; | |
120 | ||
121 | /* The next two can be zero, that's ok for us */ | |
122 | /* DEV_TYPE= */ | |
123 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); | |
124 | if (ret) | |
125 | return ret; | |
126 | ||
127 | /* DEV_MODEL= */ | |
128 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); | |
129 | if (ret) | |
130 | return ret; | |
131 | ||
132 | /* MODALIAS= */ | |
133 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); | |
134 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); | |
135 | return ret; | |
136 | } | |
137 | ||
138 | static void io_subchannel_irq(struct subchannel *); | |
139 | static int io_subchannel_probe(struct subchannel *); | |
140 | static int io_subchannel_remove(struct subchannel *); | |
141 | static void io_subchannel_shutdown(struct subchannel *); | |
142 | static int io_subchannel_sch_event(struct subchannel *, int); | |
143 | static int io_subchannel_chp_event(struct subchannel *, struct chp_link *, | |
144 | int); | |
145 | static void recovery_func(struct timer_list *unused); | |
146 | ||
147 | static struct css_device_id io_subchannel_ids[] = { | |
148 | { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, | |
149 | { /* end of list */ }, | |
150 | }; | |
151 | ||
152 | static int io_subchannel_settle(void) | |
153 | { | |
154 | int ret; | |
155 | ||
156 | ret = wait_event_interruptible(ccw_device_init_wq, | |
157 | atomic_read(&ccw_device_init_count) == 0); | |
158 | if (ret) | |
159 | return -EINTR; | |
160 | flush_workqueue(cio_work_q); | |
161 | return 0; | |
162 | } | |
163 | ||
164 | static struct css_driver io_subchannel_driver = { | |
165 | .drv = { | |
166 | .owner = THIS_MODULE, | |
167 | .name = "io_subchannel", | |
168 | }, | |
169 | .subchannel_type = io_subchannel_ids, | |
170 | .irq = io_subchannel_irq, | |
171 | .sch_event = io_subchannel_sch_event, | |
172 | .chp_event = io_subchannel_chp_event, | |
173 | .probe = io_subchannel_probe, | |
174 | .remove = io_subchannel_remove, | |
175 | .shutdown = io_subchannel_shutdown, | |
176 | .settle = io_subchannel_settle, | |
177 | }; | |
178 | ||
179 | int __init io_subchannel_init(void) | |
180 | { | |
181 | int ret; | |
182 | ||
183 | timer_setup(&recovery_timer, recovery_func, 0); | |
184 | ret = bus_register(&ccw_bus_type); | |
185 | if (ret) | |
186 | return ret; | |
187 | ret = css_driver_register(&io_subchannel_driver); | |
188 | if (ret) | |
189 | bus_unregister(&ccw_bus_type); | |
190 | ||
191 | return ret; | |
192 | } | |
193 | ||
194 | ||
195 | /************************ device handling **************************/ | |
196 | ||
197 | static ssize_t | |
198 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) | |
199 | { | |
200 | struct ccw_device *cdev = to_ccwdev(dev); | |
201 | struct ccw_device_id *id = &(cdev->id); | |
202 | ||
203 | if (id->dev_type != 0) | |
204 | return sprintf(buf, "%04x/%02x\n", | |
205 | id->dev_type, id->dev_model); | |
206 | else | |
207 | return sprintf(buf, "n/a\n"); | |
208 | } | |
209 | ||
210 | static ssize_t | |
211 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) | |
212 | { | |
213 | struct ccw_device *cdev = to_ccwdev(dev); | |
214 | struct ccw_device_id *id = &(cdev->id); | |
215 | ||
216 | return sprintf(buf, "%04x/%02x\n", | |
217 | id->cu_type, id->cu_model); | |
218 | } | |
219 | ||
220 | static ssize_t | |
221 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
222 | { | |
223 | struct ccw_device *cdev = to_ccwdev(dev); | |
224 | struct ccw_device_id *id = &(cdev->id); | |
225 | int len; | |
226 | ||
227 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); | |
228 | ||
229 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
230 | } | |
231 | ||
232 | static ssize_t | |
233 | online_show (struct device *dev, struct device_attribute *attr, char *buf) | |
234 | { | |
235 | struct ccw_device *cdev = to_ccwdev(dev); | |
236 | ||
237 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
238 | } | |
239 | ||
240 | int ccw_device_is_orphan(struct ccw_device *cdev) | |
241 | { | |
242 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
243 | } | |
244 | ||
245 | static void ccw_device_unregister(struct ccw_device *cdev) | |
246 | { | |
247 | if (device_is_registered(&cdev->dev)) { | |
248 | /* Undo device_add(). */ | |
249 | device_del(&cdev->dev); | |
250 | } | |
251 | if (cdev->private->flags.initialized) { | |
252 | cdev->private->flags.initialized = 0; | |
253 | /* Release reference from device_initialize(). */ | |
254 | put_device(&cdev->dev); | |
255 | } | |
256 | } | |
257 | ||
258 | static void io_subchannel_quiesce(struct subchannel *); | |
259 | ||
260 | /** | |
261 | * ccw_device_set_offline() - disable a ccw device for I/O | |
262 | * @cdev: target ccw device | |
263 | * | |
264 | * This function calls the driver's set_offline() function for @cdev, if | |
265 | * given, and then disables @cdev. | |
266 | * Returns: | |
267 | * %0 on success and a negative error value on failure. | |
268 | * Context: | |
269 | * enabled, ccw device lock not held | |
270 | */ | |
271 | int ccw_device_set_offline(struct ccw_device *cdev) | |
272 | { | |
273 | struct subchannel *sch; | |
274 | int ret, state; | |
275 | ||
276 | if (!cdev) | |
277 | return -ENODEV; | |
278 | if (!cdev->online || !cdev->drv) | |
279 | return -EINVAL; | |
280 | ||
281 | if (cdev->drv->set_offline) { | |
282 | ret = cdev->drv->set_offline(cdev); | |
283 | if (ret != 0) | |
284 | return ret; | |
285 | } | |
286 | spin_lock_irq(cdev->ccwlock); | |
287 | sch = to_subchannel(cdev->dev.parent); | |
288 | cdev->online = 0; | |
289 | /* Wait until a final state or DISCONNECTED is reached */ | |
290 | while (!dev_fsm_final_state(cdev) && | |
291 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
292 | spin_unlock_irq(cdev->ccwlock); | |
293 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
294 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
295 | spin_lock_irq(cdev->ccwlock); | |
296 | } | |
297 | do { | |
298 | ret = ccw_device_offline(cdev); | |
299 | if (!ret) | |
300 | break; | |
301 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device " | |
302 | "0.%x.%04x\n", ret, cdev->private->dev_id.ssid, | |
303 | cdev->private->dev_id.devno); | |
304 | if (ret != -EBUSY) | |
305 | goto error; | |
306 | state = cdev->private->state; | |
307 | spin_unlock_irq(cdev->ccwlock); | |
308 | io_subchannel_quiesce(sch); | |
309 | spin_lock_irq(cdev->ccwlock); | |
310 | cdev->private->state = state; | |
311 | } while (ret == -EBUSY); | |
312 | spin_unlock_irq(cdev->ccwlock); | |
313 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
314 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
315 | /* Inform the user if set offline failed. */ | |
316 | if (cdev->private->state == DEV_STATE_BOXED) { | |
317 | pr_warn("%s: The device entered boxed state while being set offline\n", | |
318 | dev_name(&cdev->dev)); | |
319 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
320 | pr_warn("%s: The device stopped operating while being set offline\n", | |
321 | dev_name(&cdev->dev)); | |
322 | } | |
323 | /* Give up reference from ccw_device_set_online(). */ | |
324 | put_device(&cdev->dev); | |
325 | return 0; | |
326 | ||
327 | error: | |
328 | cdev->private->state = DEV_STATE_OFFLINE; | |
329 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
330 | spin_unlock_irq(cdev->ccwlock); | |
331 | /* Give up reference from ccw_device_set_online(). */ | |
332 | put_device(&cdev->dev); | |
333 | return -ENODEV; | |
334 | } | |
335 | ||
336 | /** | |
337 | * ccw_device_set_online() - enable a ccw device for I/O | |
338 | * @cdev: target ccw device | |
339 | * | |
340 | * This function first enables @cdev and then calls the driver's set_online() | |
341 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
342 | * disabled again. | |
343 | * Returns: | |
344 | * %0 on success and a negative error value on failure. | |
345 | * Context: | |
346 | * enabled, ccw device lock not held | |
347 | */ | |
348 | int ccw_device_set_online(struct ccw_device *cdev) | |
349 | { | |
350 | int ret; | |
351 | int ret2; | |
352 | ||
353 | if (!cdev) | |
354 | return -ENODEV; | |
355 | if (cdev->online || !cdev->drv) | |
356 | return -EINVAL; | |
357 | /* Hold on to an extra reference while device is online. */ | |
358 | if (!get_device(&cdev->dev)) | |
359 | return -ENODEV; | |
360 | ||
361 | spin_lock_irq(cdev->ccwlock); | |
362 | ret = ccw_device_online(cdev); | |
363 | spin_unlock_irq(cdev->ccwlock); | |
364 | if (ret == 0) | |
365 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
366 | else { | |
367 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " | |
368 | "device 0.%x.%04x\n", | |
369 | ret, cdev->private->dev_id.ssid, | |
370 | cdev->private->dev_id.devno); | |
371 | /* Give up online reference since onlining failed. */ | |
372 | put_device(&cdev->dev); | |
373 | return ret; | |
374 | } | |
375 | spin_lock_irq(cdev->ccwlock); | |
376 | /* Check if online processing was successful */ | |
377 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
378 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
379 | spin_unlock_irq(cdev->ccwlock); | |
380 | /* Inform the user that set online failed. */ | |
381 | if (cdev->private->state == DEV_STATE_BOXED) { | |
382 | pr_warn("%s: Setting the device online failed because it is boxed\n", | |
383 | dev_name(&cdev->dev)); | |
384 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
385 | pr_warn("%s: Setting the device online failed because it is not operational\n", | |
386 | dev_name(&cdev->dev)); | |
387 | } | |
388 | /* Give up online reference since onlining failed. */ | |
389 | put_device(&cdev->dev); | |
390 | return -ENODEV; | |
391 | } | |
392 | spin_unlock_irq(cdev->ccwlock); | |
393 | if (cdev->drv->set_online) | |
394 | ret = cdev->drv->set_online(cdev); | |
395 | if (ret) | |
396 | goto rollback; | |
397 | ||
398 | spin_lock_irq(cdev->ccwlock); | |
399 | cdev->online = 1; | |
400 | spin_unlock_irq(cdev->ccwlock); | |
401 | return 0; | |
402 | ||
403 | rollback: | |
404 | spin_lock_irq(cdev->ccwlock); | |
405 | /* Wait until a final state or DISCONNECTED is reached */ | |
406 | while (!dev_fsm_final_state(cdev) && | |
407 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
408 | spin_unlock_irq(cdev->ccwlock); | |
409 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
410 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
411 | spin_lock_irq(cdev->ccwlock); | |
412 | } | |
413 | ret2 = ccw_device_offline(cdev); | |
414 | if (ret2) | |
415 | goto error; | |
416 | spin_unlock_irq(cdev->ccwlock); | |
417 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
418 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
419 | /* Give up online reference since onlining failed. */ | |
420 | put_device(&cdev->dev); | |
421 | return ret; | |
422 | ||
423 | error: | |
424 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
425 | "device 0.%x.%04x\n", | |
426 | ret2, cdev->private->dev_id.ssid, | |
427 | cdev->private->dev_id.devno); | |
428 | cdev->private->state = DEV_STATE_OFFLINE; | |
429 | spin_unlock_irq(cdev->ccwlock); | |
430 | /* Give up online reference since onlining failed. */ | |
431 | put_device(&cdev->dev); | |
432 | return ret; | |
433 | } | |
434 | ||
435 | static int online_store_handle_offline(struct ccw_device *cdev) | |
436 | { | |
437 | if (cdev->private->state == DEV_STATE_DISCONNECTED) { | |
438 | spin_lock_irq(cdev->ccwlock); | |
439 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); | |
440 | spin_unlock_irq(cdev->ccwlock); | |
441 | return 0; | |
442 | } | |
443 | if (cdev->drv && cdev->drv->set_offline) | |
444 | return ccw_device_set_offline(cdev); | |
445 | return -EINVAL; | |
446 | } | |
447 | ||
448 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
449 | { | |
450 | /* Do device recognition, if needed. */ | |
451 | if (cdev->private->state == DEV_STATE_BOXED) { | |
452 | spin_lock_irq(cdev->ccwlock); | |
453 | ccw_device_recognition(cdev); | |
454 | spin_unlock_irq(cdev->ccwlock); | |
455 | wait_event(cdev->private->wait_q, | |
456 | cdev->private->flags.recog_done); | |
457 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
458 | /* recognition failed */ | |
459 | return -EAGAIN; | |
460 | } | |
461 | if (cdev->drv && cdev->drv->set_online) | |
462 | return ccw_device_set_online(cdev); | |
463 | return -EINVAL; | |
464 | } | |
465 | ||
466 | static int online_store_handle_online(struct ccw_device *cdev, int force) | |
467 | { | |
468 | int ret; | |
469 | ||
470 | ret = online_store_recog_and_online(cdev); | |
471 | if (ret && !force) | |
472 | return ret; | |
473 | if (force && cdev->private->state == DEV_STATE_BOXED) { | |
474 | ret = ccw_device_stlck(cdev); | |
475 | if (ret) | |
476 | return ret; | |
477 | if (cdev->id.cu_type == 0) | |
478 | cdev->private->state = DEV_STATE_NOT_OPER; | |
479 | ret = online_store_recog_and_online(cdev); | |
480 | if (ret) | |
481 | return ret; | |
482 | } | |
483 | return 0; | |
484 | } | |
485 | ||
486 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
487 | const char *buf, size_t count) | |
488 | { | |
489 | struct ccw_device *cdev = to_ccwdev(dev); | |
490 | int force, ret; | |
491 | unsigned long i; | |
492 | ||
493 | /* Prevent conflict between multiple on-/offline processing requests. */ | |
494 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) | |
495 | return -EAGAIN; | |
496 | /* Prevent conflict between internal I/Os and on-/offline processing. */ | |
497 | if (!dev_fsm_final_state(cdev) && | |
498 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
499 | ret = -EAGAIN; | |
500 | goto out; | |
501 | } | |
502 | /* Prevent conflict between pending work and on-/offline processing.*/ | |
503 | if (work_pending(&cdev->private->todo_work)) { | |
504 | ret = -EAGAIN; | |
505 | goto out; | |
506 | } | |
507 | if (!strncmp(buf, "force\n", count)) { | |
508 | force = 1; | |
509 | i = 1; | |
510 | ret = 0; | |
511 | } else { | |
512 | force = 0; | |
513 | ret = kstrtoul(buf, 16, &i); | |
514 | } | |
515 | if (ret) | |
516 | goto out; | |
517 | ||
518 | device_lock(dev); | |
519 | switch (i) { | |
520 | case 0: | |
521 | ret = online_store_handle_offline(cdev); | |
522 | break; | |
523 | case 1: | |
524 | ret = online_store_handle_online(cdev, force); | |
525 | break; | |
526 | default: | |
527 | ret = -EINVAL; | |
528 | } | |
529 | device_unlock(dev); | |
530 | ||
531 | out: | |
532 | atomic_set(&cdev->private->onoff, 0); | |
533 | return (ret < 0) ? ret : count; | |
534 | } | |
535 | ||
536 | static ssize_t | |
537 | available_show (struct device *dev, struct device_attribute *attr, char *buf) | |
538 | { | |
539 | struct ccw_device *cdev = to_ccwdev(dev); | |
540 | struct subchannel *sch; | |
541 | ||
542 | if (ccw_device_is_orphan(cdev)) | |
543 | return sprintf(buf, "no device\n"); | |
544 | switch (cdev->private->state) { | |
545 | case DEV_STATE_BOXED: | |
546 | return sprintf(buf, "boxed\n"); | |
547 | case DEV_STATE_DISCONNECTED: | |
548 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
549 | case DEV_STATE_NOT_OPER: | |
550 | sch = to_subchannel(dev->parent); | |
551 | if (!sch->lpm) | |
552 | return sprintf(buf, "no path\n"); | |
553 | else | |
554 | return sprintf(buf, "no device\n"); | |
555 | default: | |
556 | /* All other states considered fine. */ | |
557 | return sprintf(buf, "good\n"); | |
558 | } | |
559 | } | |
560 | ||
561 | static ssize_t | |
562 | initiate_logging(struct device *dev, struct device_attribute *attr, | |
563 | const char *buf, size_t count) | |
564 | { | |
565 | struct subchannel *sch = to_subchannel(dev); | |
566 | int rc; | |
567 | ||
568 | rc = chsc_siosl(sch->schid); | |
569 | if (rc < 0) { | |
570 | pr_warn("Logging for subchannel 0.%x.%04x failed with errno=%d\n", | |
571 | sch->schid.ssid, sch->schid.sch_no, rc); | |
572 | return rc; | |
573 | } | |
574 | pr_notice("Logging for subchannel 0.%x.%04x was triggered\n", | |
575 | sch->schid.ssid, sch->schid.sch_no); | |
576 | return count; | |
577 | } | |
578 | ||
579 | static ssize_t vpm_show(struct device *dev, struct device_attribute *attr, | |
580 | char *buf) | |
581 | { | |
582 | struct subchannel *sch = to_subchannel(dev); | |
583 | ||
584 | return sprintf(buf, "%02x\n", sch->vpm); | |
585 | } | |
586 | ||
587 | static DEVICE_ATTR_RO(devtype); | |
588 | static DEVICE_ATTR_RO(cutype); | |
589 | static DEVICE_ATTR_RO(modalias); | |
590 | static DEVICE_ATTR_RW(online); | |
591 | static DEVICE_ATTR(availability, 0444, available_show, NULL); | |
592 | static DEVICE_ATTR(logging, 0200, NULL, initiate_logging); | |
593 | static DEVICE_ATTR_RO(vpm); | |
594 | ||
595 | static struct attribute *io_subchannel_attrs[] = { | |
596 | &dev_attr_logging.attr, | |
597 | &dev_attr_vpm.attr, | |
598 | NULL, | |
599 | }; | |
600 | ||
601 | static const struct attribute_group io_subchannel_attr_group = { | |
602 | .attrs = io_subchannel_attrs, | |
603 | }; | |
604 | ||
605 | static struct attribute * ccwdev_attrs[] = { | |
606 | &dev_attr_devtype.attr, | |
607 | &dev_attr_cutype.attr, | |
608 | &dev_attr_modalias.attr, | |
609 | &dev_attr_online.attr, | |
610 | &dev_attr_cmb_enable.attr, | |
611 | &dev_attr_availability.attr, | |
612 | NULL, | |
613 | }; | |
614 | ||
615 | static const struct attribute_group ccwdev_attr_group = { | |
616 | .attrs = ccwdev_attrs, | |
617 | }; | |
618 | ||
619 | static const struct attribute_group *ccwdev_attr_groups[] = { | |
620 | &ccwdev_attr_group, | |
621 | NULL, | |
622 | }; | |
623 | ||
624 | static int ccw_device_add(struct ccw_device *cdev) | |
625 | { | |
626 | struct device *dev = &cdev->dev; | |
627 | ||
628 | dev->bus = &ccw_bus_type; | |
629 | return device_add(dev); | |
630 | } | |
631 | ||
632 | static int match_dev_id(struct device *dev, const void *data) | |
633 | { | |
634 | struct ccw_device *cdev = to_ccwdev(dev); | |
635 | struct ccw_dev_id *dev_id = (void *)data; | |
636 | ||
637 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); | |
638 | } | |
639 | ||
640 | /** | |
641 | * get_ccwdev_by_dev_id() - obtain device from a ccw device id | |
642 | * @dev_id: id of the device to be searched | |
643 | * | |
644 | * This function searches all devices attached to the ccw bus for a device | |
645 | * matching @dev_id. | |
646 | * Returns: | |
647 | * If a device is found its reference count is increased and returned; | |
648 | * else %NULL is returned. | |
649 | */ | |
650 | struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id) | |
651 | { | |
652 | struct device *dev; | |
653 | ||
654 | dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id); | |
655 | ||
656 | return dev ? to_ccwdev(dev) : NULL; | |
657 | } | |
658 | EXPORT_SYMBOL_GPL(get_ccwdev_by_dev_id); | |
659 | ||
660 | static void ccw_device_do_unbind_bind(struct ccw_device *cdev) | |
661 | { | |
662 | int ret; | |
663 | ||
664 | if (device_is_registered(&cdev->dev)) { | |
665 | device_release_driver(&cdev->dev); | |
666 | ret = device_attach(&cdev->dev); | |
667 | WARN_ON(ret == -ENODEV); | |
668 | } | |
669 | } | |
670 | ||
671 | static void | |
672 | ccw_device_release(struct device *dev) | |
673 | { | |
674 | struct ccw_device *cdev; | |
675 | ||
676 | cdev = to_ccwdev(dev); | |
677 | cio_gp_dma_free(cdev->private->dma_pool, cdev->private->dma_area, | |
678 | sizeof(*cdev->private->dma_area)); | |
679 | cio_gp_dma_destroy(cdev->private->dma_pool, &cdev->dev); | |
680 | /* Release reference of parent subchannel. */ | |
681 | put_device(cdev->dev.parent); | |
682 | kfree(cdev->private); | |
683 | kfree(cdev); | |
684 | } | |
685 | ||
686 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) | |
687 | { | |
688 | struct ccw_device *cdev; | |
689 | struct gen_pool *dma_pool; | |
690 | ||
691 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
692 | if (!cdev) | |
693 | goto err_cdev; | |
694 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
695 | GFP_KERNEL | GFP_DMA); | |
696 | if (!cdev->private) | |
697 | goto err_priv; | |
698 | cdev->dev.coherent_dma_mask = sch->dev.coherent_dma_mask; | |
699 | cdev->dev.dma_mask = sch->dev.dma_mask; | |
700 | dma_pool = cio_gp_dma_create(&cdev->dev, 1); | |
701 | if (!dma_pool) | |
702 | goto err_dma_pool; | |
703 | cdev->private->dma_pool = dma_pool; | |
704 | cdev->private->dma_area = cio_gp_dma_zalloc(dma_pool, &cdev->dev, | |
705 | sizeof(*cdev->private->dma_area)); | |
706 | if (!cdev->private->dma_area) | |
707 | goto err_dma_area; | |
708 | return cdev; | |
709 | err_dma_area: | |
710 | cio_gp_dma_destroy(dma_pool, &cdev->dev); | |
711 | err_dma_pool: | |
712 | kfree(cdev->private); | |
713 | err_priv: | |
714 | kfree(cdev); | |
715 | err_cdev: | |
716 | return ERR_PTR(-ENOMEM); | |
717 | } | |
718 | ||
719 | static void ccw_device_todo(struct work_struct *work); | |
720 | ||
721 | static int io_subchannel_initialize_dev(struct subchannel *sch, | |
722 | struct ccw_device *cdev) | |
723 | { | |
724 | struct ccw_device_private *priv = cdev->private; | |
725 | int ret; | |
726 | ||
727 | priv->cdev = cdev; | |
728 | priv->int_class = IRQIO_CIO; | |
729 | priv->state = DEV_STATE_NOT_OPER; | |
730 | priv->dev_id.devno = sch->schib.pmcw.dev; | |
731 | priv->dev_id.ssid = sch->schid.ssid; | |
732 | ||
733 | INIT_WORK(&priv->todo_work, ccw_device_todo); | |
734 | INIT_LIST_HEAD(&priv->cmb_list); | |
735 | init_waitqueue_head(&priv->wait_q); | |
736 | timer_setup(&priv->timer, ccw_device_timeout, 0); | |
737 | ||
738 | atomic_set(&priv->onoff, 0); | |
739 | cdev->ccwlock = sch->lock; | |
740 | cdev->dev.parent = &sch->dev; | |
741 | cdev->dev.release = ccw_device_release; | |
742 | cdev->dev.groups = ccwdev_attr_groups; | |
743 | /* Do first half of device_register. */ | |
744 | device_initialize(&cdev->dev); | |
745 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, | |
746 | cdev->private->dev_id.devno); | |
747 | if (ret) | |
748 | goto out_put; | |
749 | if (!get_device(&sch->dev)) { | |
750 | ret = -ENODEV; | |
751 | goto out_put; | |
752 | } | |
753 | priv->flags.initialized = 1; | |
754 | spin_lock_irq(sch->lock); | |
755 | sch_set_cdev(sch, cdev); | |
756 | spin_unlock_irq(sch->lock); | |
757 | return 0; | |
758 | ||
759 | out_put: | |
760 | /* Release reference from device_initialize(). */ | |
761 | put_device(&cdev->dev); | |
762 | return ret; | |
763 | } | |
764 | ||
765 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
766 | { | |
767 | struct ccw_device *cdev; | |
768 | int ret; | |
769 | ||
770 | cdev = io_subchannel_allocate_dev(sch); | |
771 | if (!IS_ERR(cdev)) { | |
772 | ret = io_subchannel_initialize_dev(sch, cdev); | |
773 | if (ret) | |
774 | cdev = ERR_PTR(ret); | |
775 | } | |
776 | return cdev; | |
777 | } | |
778 | ||
779 | static void io_subchannel_recog(struct ccw_device *, struct subchannel *); | |
780 | ||
781 | static void sch_create_and_recog_new_device(struct subchannel *sch) | |
782 | { | |
783 | struct ccw_device *cdev; | |
784 | ||
785 | /* Need to allocate a new ccw device. */ | |
786 | cdev = io_subchannel_create_ccwdev(sch); | |
787 | if (IS_ERR(cdev)) { | |
788 | /* OK, we did everything we could... */ | |
789 | css_sch_device_unregister(sch); | |
790 | return; | |
791 | } | |
792 | /* Start recognition for the new ccw device. */ | |
793 | io_subchannel_recog(cdev, sch); | |
794 | } | |
795 | ||
796 | /* | |
797 | * Register recognized device. | |
798 | */ | |
799 | static void io_subchannel_register(struct ccw_device *cdev) | |
800 | { | |
801 | struct subchannel *sch; | |
802 | int ret, adjust_init_count = 1; | |
803 | unsigned long flags; | |
804 | ||
805 | sch = to_subchannel(cdev->dev.parent); | |
806 | /* | |
807 | * Check if subchannel is still registered. It may have become | |
808 | * unregistered if a machine check hit us after finishing | |
809 | * device recognition but before the register work could be | |
810 | * queued. | |
811 | */ | |
812 | if (!device_is_registered(&sch->dev)) | |
813 | goto out_err; | |
814 | css_update_ssd_info(sch); | |
815 | /* | |
816 | * io_subchannel_register() will also be called after device | |
817 | * recognition has been done for a boxed device (which will already | |
818 | * be registered). We need to reprobe since we may now have sense id | |
819 | * information. | |
820 | */ | |
821 | if (device_is_registered(&cdev->dev)) { | |
822 | if (!cdev->drv) { | |
823 | ret = device_reprobe(&cdev->dev); | |
824 | if (ret) | |
825 | /* We can't do much here. */ | |
826 | CIO_MSG_EVENT(0, "device_reprobe() returned" | |
827 | " %d for 0.%x.%04x\n", ret, | |
828 | cdev->private->dev_id.ssid, | |
829 | cdev->private->dev_id.devno); | |
830 | } | |
831 | adjust_init_count = 0; | |
832 | goto out; | |
833 | } | |
834 | /* | |
835 | * Now we know this subchannel will stay, we can throw | |
836 | * our delayed uevent. | |
837 | */ | |
838 | if (dev_get_uevent_suppress(&sch->dev)) { | |
839 | dev_set_uevent_suppress(&sch->dev, 0); | |
840 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); | |
841 | } | |
842 | /* make it known to the system */ | |
843 | ret = ccw_device_add(cdev); | |
844 | if (ret) { | |
845 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", | |
846 | cdev->private->dev_id.ssid, | |
847 | cdev->private->dev_id.devno, ret); | |
848 | spin_lock_irqsave(sch->lock, flags); | |
849 | sch_set_cdev(sch, NULL); | |
850 | spin_unlock_irqrestore(sch->lock, flags); | |
851 | /* Release initial device reference. */ | |
852 | put_device(&cdev->dev); | |
853 | goto out_err; | |
854 | } | |
855 | out: | |
856 | cdev->private->flags.recog_done = 1; | |
857 | wake_up(&cdev->private->wait_q); | |
858 | out_err: | |
859 | if (adjust_init_count && atomic_dec_and_test(&ccw_device_init_count)) | |
860 | wake_up(&ccw_device_init_wq); | |
861 | } | |
862 | ||
863 | static void ccw_device_call_sch_unregister(struct ccw_device *cdev) | |
864 | { | |
865 | struct subchannel *sch; | |
866 | ||
867 | /* Get subchannel reference for local processing. */ | |
868 | if (!get_device(cdev->dev.parent)) | |
869 | return; | |
870 | sch = to_subchannel(cdev->dev.parent); | |
871 | css_sch_device_unregister(sch); | |
872 | /* Release subchannel reference for local processing. */ | |
873 | put_device(&sch->dev); | |
874 | } | |
875 | ||
876 | /* | |
877 | * subchannel recognition done. Called from the state machine. | |
878 | */ | |
879 | void | |
880 | io_subchannel_recog_done(struct ccw_device *cdev) | |
881 | { | |
882 | if (css_init_done == 0) { | |
883 | cdev->private->flags.recog_done = 1; | |
884 | return; | |
885 | } | |
886 | switch (cdev->private->state) { | |
887 | case DEV_STATE_BOXED: | |
888 | /* Device did not respond in time. */ | |
889 | case DEV_STATE_NOT_OPER: | |
890 | cdev->private->flags.recog_done = 1; | |
891 | /* Remove device found not operational. */ | |
892 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
893 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
894 | wake_up(&ccw_device_init_wq); | |
895 | break; | |
896 | case DEV_STATE_OFFLINE: | |
897 | /* | |
898 | * We can't register the device in interrupt context so | |
899 | * we schedule a work item. | |
900 | */ | |
901 | ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER); | |
902 | break; | |
903 | } | |
904 | } | |
905 | ||
906 | static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
907 | { | |
908 | /* Increase counter of devices currently in recognition. */ | |
909 | atomic_inc(&ccw_device_init_count); | |
910 | ||
911 | /* Start async. device sensing. */ | |
912 | spin_lock_irq(sch->lock); | |
913 | ccw_device_recognition(cdev); | |
914 | spin_unlock_irq(sch->lock); | |
915 | } | |
916 | ||
917 | static int ccw_device_move_to_sch(struct ccw_device *cdev, | |
918 | struct subchannel *sch) | |
919 | { | |
920 | struct subchannel *old_sch; | |
921 | int rc, old_enabled = 0; | |
922 | ||
923 | old_sch = to_subchannel(cdev->dev.parent); | |
924 | /* Obtain child reference for new parent. */ | |
925 | if (!get_device(&sch->dev)) | |
926 | return -ENODEV; | |
927 | ||
928 | if (!sch_is_pseudo_sch(old_sch)) { | |
929 | spin_lock_irq(old_sch->lock); | |
930 | old_enabled = old_sch->schib.pmcw.ena; | |
931 | rc = 0; | |
932 | if (old_enabled) | |
933 | rc = cio_disable_subchannel(old_sch); | |
934 | spin_unlock_irq(old_sch->lock); | |
935 | if (rc == -EBUSY) { | |
936 | /* Release child reference for new parent. */ | |
937 | put_device(&sch->dev); | |
938 | return rc; | |
939 | } | |
940 | } | |
941 | ||
942 | mutex_lock(&sch->reg_mutex); | |
943 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); | |
944 | mutex_unlock(&sch->reg_mutex); | |
945 | if (rc) { | |
946 | CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", | |
947 | cdev->private->dev_id.ssid, | |
948 | cdev->private->dev_id.devno, sch->schid.ssid, | |
949 | sch->schib.pmcw.dev, rc); | |
950 | if (old_enabled) { | |
951 | /* Try to reenable the old subchannel. */ | |
952 | spin_lock_irq(old_sch->lock); | |
953 | cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch); | |
954 | spin_unlock_irq(old_sch->lock); | |
955 | } | |
956 | /* Release child reference for new parent. */ | |
957 | put_device(&sch->dev); | |
958 | return rc; | |
959 | } | |
960 | /* Clean up old subchannel. */ | |
961 | if (!sch_is_pseudo_sch(old_sch)) { | |
962 | spin_lock_irq(old_sch->lock); | |
963 | sch_set_cdev(old_sch, NULL); | |
964 | spin_unlock_irq(old_sch->lock); | |
965 | css_schedule_eval(old_sch->schid); | |
966 | } | |
967 | /* Release child reference for old parent. */ | |
968 | put_device(&old_sch->dev); | |
969 | /* Initialize new subchannel. */ | |
970 | spin_lock_irq(sch->lock); | |
971 | cdev->ccwlock = sch->lock; | |
972 | if (!sch_is_pseudo_sch(sch)) | |
973 | sch_set_cdev(sch, cdev); | |
974 | spin_unlock_irq(sch->lock); | |
975 | if (!sch_is_pseudo_sch(sch)) | |
976 | css_update_ssd_info(sch); | |
977 | return 0; | |
978 | } | |
979 | ||
980 | static int ccw_device_move_to_orph(struct ccw_device *cdev) | |
981 | { | |
982 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
983 | struct channel_subsystem *css = to_css(sch->dev.parent); | |
984 | ||
985 | return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); | |
986 | } | |
987 | ||
988 | static void io_subchannel_irq(struct subchannel *sch) | |
989 | { | |
990 | struct ccw_device *cdev; | |
991 | ||
992 | cdev = sch_get_cdev(sch); | |
993 | ||
994 | CIO_TRACE_EVENT(6, "IRQ"); | |
995 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
996 | if (cdev) | |
997 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
998 | else | |
999 | inc_irq_stat(IRQIO_CIO); | |
1000 | } | |
1001 | ||
1002 | void io_subchannel_init_config(struct subchannel *sch) | |
1003 | { | |
1004 | memset(&sch->config, 0, sizeof(sch->config)); | |
1005 | sch->config.csense = 1; | |
1006 | } | |
1007 | ||
1008 | static void io_subchannel_init_fields(struct subchannel *sch) | |
1009 | { | |
1010 | if (cio_is_console(sch->schid)) | |
1011 | sch->opm = 0xff; | |
1012 | else | |
1013 | sch->opm = chp_get_sch_opm(sch); | |
1014 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
1015 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; | |
1016 | ||
1017 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1018 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1019 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1020 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1021 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
1022 | ||
1023 | io_subchannel_init_config(sch); | |
1024 | } | |
1025 | ||
1026 | /* | |
1027 | * Note: We always return 0 so that we bind to the device even on error. | |
1028 | * This is needed so that our remove function is called on unregister. | |
1029 | */ | |
1030 | static int io_subchannel_probe(struct subchannel *sch) | |
1031 | { | |
1032 | struct io_subchannel_private *io_priv; | |
1033 | struct ccw_device *cdev; | |
1034 | int rc; | |
1035 | ||
1036 | if (cio_is_console(sch->schid)) { | |
1037 | rc = sysfs_create_group(&sch->dev.kobj, | |
1038 | &io_subchannel_attr_group); | |
1039 | if (rc) | |
1040 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1041 | "attributes for subchannel " | |
1042 | "0.%x.%04x (rc=%d)\n", | |
1043 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1044 | /* | |
1045 | * The console subchannel already has an associated ccw_device. | |
1046 | * Throw the delayed uevent for the subchannel, register | |
1047 | * the ccw_device and exit. | |
1048 | */ | |
1049 | if (dev_get_uevent_suppress(&sch->dev)) { | |
1050 | /* should always be the case for the console */ | |
1051 | dev_set_uevent_suppress(&sch->dev, 0); | |
1052 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); | |
1053 | } | |
1054 | cdev = sch_get_cdev(sch); | |
1055 | rc = ccw_device_add(cdev); | |
1056 | if (rc) { | |
1057 | /* Release online reference. */ | |
1058 | put_device(&cdev->dev); | |
1059 | goto out_schedule; | |
1060 | } | |
1061 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1062 | wake_up(&ccw_device_init_wq); | |
1063 | return 0; | |
1064 | } | |
1065 | io_subchannel_init_fields(sch); | |
1066 | rc = cio_commit_config(sch); | |
1067 | if (rc) | |
1068 | goto out_schedule; | |
1069 | rc = sysfs_create_group(&sch->dev.kobj, | |
1070 | &io_subchannel_attr_group); | |
1071 | if (rc) | |
1072 | goto out_schedule; | |
1073 | /* Allocate I/O subchannel private data. */ | |
1074 | io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); | |
1075 | if (!io_priv) | |
1076 | goto out_schedule; | |
1077 | ||
1078 | io_priv->dma_area = dma_alloc_coherent(&sch->dev, | |
1079 | sizeof(*io_priv->dma_area), | |
1080 | &io_priv->dma_area_dma, GFP_KERNEL); | |
1081 | if (!io_priv->dma_area) { | |
1082 | kfree(io_priv); | |
1083 | goto out_schedule; | |
1084 | } | |
1085 | ||
1086 | set_io_private(sch, io_priv); | |
1087 | css_schedule_eval(sch->schid); | |
1088 | return 0; | |
1089 | ||
1090 | out_schedule: | |
1091 | spin_lock_irq(sch->lock); | |
1092 | css_sched_sch_todo(sch, SCH_TODO_UNREG); | |
1093 | spin_unlock_irq(sch->lock); | |
1094 | return 0; | |
1095 | } | |
1096 | ||
1097 | static int io_subchannel_remove(struct subchannel *sch) | |
1098 | { | |
1099 | struct io_subchannel_private *io_priv = to_io_private(sch); | |
1100 | struct ccw_device *cdev; | |
1101 | ||
1102 | cdev = sch_get_cdev(sch); | |
1103 | if (!cdev) | |
1104 | goto out_free; | |
1105 | ||
1106 | ccw_device_unregister(cdev); | |
1107 | spin_lock_irq(sch->lock); | |
1108 | sch_set_cdev(sch, NULL); | |
1109 | set_io_private(sch, NULL); | |
1110 | spin_unlock_irq(sch->lock); | |
1111 | out_free: | |
1112 | dma_free_coherent(&sch->dev, sizeof(*io_priv->dma_area), | |
1113 | io_priv->dma_area, io_priv->dma_area_dma); | |
1114 | kfree(io_priv); | |
1115 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); | |
1116 | return 0; | |
1117 | } | |
1118 | ||
1119 | static void io_subchannel_verify(struct subchannel *sch) | |
1120 | { | |
1121 | struct ccw_device *cdev; | |
1122 | ||
1123 | cdev = sch_get_cdev(sch); | |
1124 | if (cdev) | |
1125 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1126 | } | |
1127 | ||
1128 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) | |
1129 | { | |
1130 | struct ccw_device *cdev; | |
1131 | ||
1132 | cdev = sch_get_cdev(sch); | |
1133 | if (!cdev) | |
1134 | return; | |
1135 | if (cio_update_schib(sch)) | |
1136 | goto err; | |
1137 | /* Check for I/O on path. */ | |
1138 | if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask) | |
1139 | goto out; | |
1140 | if (cdev->private->state == DEV_STATE_ONLINE) { | |
1141 | ccw_device_kill_io(cdev); | |
1142 | goto out; | |
1143 | } | |
1144 | if (cio_clear(sch)) | |
1145 | goto err; | |
1146 | out: | |
1147 | /* Trigger path verification. */ | |
1148 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1149 | return; | |
1150 | ||
1151 | err: | |
1152 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
1153 | } | |
1154 | ||
1155 | static int io_subchannel_chp_event(struct subchannel *sch, | |
1156 | struct chp_link *link, int event) | |
1157 | { | |
1158 | struct ccw_device *cdev = sch_get_cdev(sch); | |
1159 | int mask, chpid, valid_bit; | |
1160 | int path_event[8]; | |
1161 | ||
1162 | mask = chp_ssd_get_mask(&sch->ssd_info, link); | |
1163 | if (!mask) | |
1164 | return 0; | |
1165 | switch (event) { | |
1166 | case CHP_VARY_OFF: | |
1167 | sch->opm &= ~mask; | |
1168 | sch->lpm &= ~mask; | |
1169 | if (cdev) | |
1170 | cdev->private->path_gone_mask |= mask; | |
1171 | io_subchannel_terminate_path(sch, mask); | |
1172 | break; | |
1173 | case CHP_VARY_ON: | |
1174 | sch->opm |= mask; | |
1175 | sch->lpm |= mask; | |
1176 | if (cdev) | |
1177 | cdev->private->path_new_mask |= mask; | |
1178 | io_subchannel_verify(sch); | |
1179 | break; | |
1180 | case CHP_OFFLINE: | |
1181 | if (cio_update_schib(sch)) | |
1182 | return -ENODEV; | |
1183 | if (cdev) | |
1184 | cdev->private->path_gone_mask |= mask; | |
1185 | io_subchannel_terminate_path(sch, mask); | |
1186 | break; | |
1187 | case CHP_ONLINE: | |
1188 | if (cio_update_schib(sch)) | |
1189 | return -ENODEV; | |
1190 | sch->lpm |= mask & sch->opm; | |
1191 | if (cdev) | |
1192 | cdev->private->path_new_mask |= mask; | |
1193 | io_subchannel_verify(sch); | |
1194 | break; | |
1195 | case CHP_FCES_EVENT: | |
1196 | /* Forward Endpoint Security event */ | |
1197 | for (chpid = 0, valid_bit = 0x80; chpid < 8; chpid++, | |
1198 | valid_bit >>= 1) { | |
1199 | if (mask & valid_bit) | |
1200 | path_event[chpid] = PE_PATH_FCES_EVENT; | |
1201 | else | |
1202 | path_event[chpid] = PE_NONE; | |
1203 | } | |
1204 | if (cdev) | |
1205 | cdev->drv->path_event(cdev, path_event); | |
1206 | break; | |
1207 | } | |
1208 | return 0; | |
1209 | } | |
1210 | ||
1211 | static void io_subchannel_quiesce(struct subchannel *sch) | |
1212 | { | |
1213 | struct ccw_device *cdev; | |
1214 | int ret; | |
1215 | ||
1216 | spin_lock_irq(sch->lock); | |
1217 | cdev = sch_get_cdev(sch); | |
1218 | if (cio_is_console(sch->schid)) | |
1219 | goto out_unlock; | |
1220 | if (!sch->schib.pmcw.ena) | |
1221 | goto out_unlock; | |
1222 | ret = cio_disable_subchannel(sch); | |
1223 | if (ret != -EBUSY) | |
1224 | goto out_unlock; | |
1225 | if (cdev->handler) | |
1226 | cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO)); | |
1227 | while (ret == -EBUSY) { | |
1228 | cdev->private->state = DEV_STATE_QUIESCE; | |
1229 | cdev->private->iretry = 255; | |
1230 | ret = ccw_device_cancel_halt_clear(cdev); | |
1231 | if (ret == -EBUSY) { | |
1232 | ccw_device_set_timeout(cdev, HZ/10); | |
1233 | spin_unlock_irq(sch->lock); | |
1234 | wait_event(cdev->private->wait_q, | |
1235 | cdev->private->state != DEV_STATE_QUIESCE); | |
1236 | spin_lock_irq(sch->lock); | |
1237 | } | |
1238 | ret = cio_disable_subchannel(sch); | |
1239 | } | |
1240 | out_unlock: | |
1241 | spin_unlock_irq(sch->lock); | |
1242 | } | |
1243 | ||
1244 | static void io_subchannel_shutdown(struct subchannel *sch) | |
1245 | { | |
1246 | io_subchannel_quiesce(sch); | |
1247 | } | |
1248 | ||
1249 | static int device_is_disconnected(struct ccw_device *cdev) | |
1250 | { | |
1251 | if (!cdev) | |
1252 | return 0; | |
1253 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1254 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1255 | } | |
1256 | ||
1257 | static int recovery_check(struct device *dev, void *data) | |
1258 | { | |
1259 | struct ccw_device *cdev = to_ccwdev(dev); | |
1260 | struct subchannel *sch; | |
1261 | int *redo = data; | |
1262 | ||
1263 | spin_lock_irq(cdev->ccwlock); | |
1264 | switch (cdev->private->state) { | |
1265 | case DEV_STATE_ONLINE: | |
1266 | sch = to_subchannel(cdev->dev.parent); | |
1267 | if ((sch->schib.pmcw.pam & sch->opm) == sch->vpm) | |
1268 | break; | |
1269 | fallthrough; | |
1270 | case DEV_STATE_DISCONNECTED: | |
1271 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1272 | cdev->private->dev_id.ssid, | |
1273 | cdev->private->dev_id.devno); | |
1274 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1275 | *redo = 1; | |
1276 | break; | |
1277 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1278 | *redo = 1; | |
1279 | break; | |
1280 | } | |
1281 | spin_unlock_irq(cdev->ccwlock); | |
1282 | ||
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | static void recovery_work_func(struct work_struct *unused) | |
1287 | { | |
1288 | int redo = 0; | |
1289 | ||
1290 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1291 | if (redo) { | |
1292 | spin_lock_irq(&recovery_lock); | |
1293 | if (!timer_pending(&recovery_timer)) { | |
1294 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1295 | recovery_phase++; | |
1296 | mod_timer(&recovery_timer, jiffies + | |
1297 | recovery_delay[recovery_phase] * HZ); | |
1298 | } | |
1299 | spin_unlock_irq(&recovery_lock); | |
1300 | } else | |
1301 | CIO_MSG_EVENT(3, "recovery: end\n"); | |
1302 | } | |
1303 | ||
1304 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1305 | ||
1306 | static void recovery_func(struct timer_list *unused) | |
1307 | { | |
1308 | /* | |
1309 | * We can't do our recovery in softirq context and it's not | |
1310 | * performance critical, so we schedule it. | |
1311 | */ | |
1312 | schedule_work(&recovery_work); | |
1313 | } | |
1314 | ||
1315 | void ccw_device_schedule_recovery(void) | |
1316 | { | |
1317 | unsigned long flags; | |
1318 | ||
1319 | CIO_MSG_EVENT(3, "recovery: schedule\n"); | |
1320 | spin_lock_irqsave(&recovery_lock, flags); | |
1321 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1322 | recovery_phase = 0; | |
1323 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1324 | } | |
1325 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1326 | } | |
1327 | ||
1328 | static int purge_fn(struct device *dev, void *data) | |
1329 | { | |
1330 | struct ccw_device *cdev = to_ccwdev(dev); | |
1331 | struct ccw_dev_id *id = &cdev->private->dev_id; | |
1332 | ||
1333 | spin_lock_irq(cdev->ccwlock); | |
1334 | if (is_blacklisted(id->ssid, id->devno) && | |
1335 | (cdev->private->state == DEV_STATE_OFFLINE) && | |
1336 | (atomic_cmpxchg(&cdev->private->onoff, 0, 1) == 0)) { | |
1337 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid, | |
1338 | id->devno); | |
1339 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1340 | atomic_set(&cdev->private->onoff, 0); | |
1341 | } | |
1342 | spin_unlock_irq(cdev->ccwlock); | |
1343 | /* Abort loop in case of pending signal. */ | |
1344 | if (signal_pending(current)) | |
1345 | return -EINTR; | |
1346 | ||
1347 | return 0; | |
1348 | } | |
1349 | ||
1350 | /** | |
1351 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1352 | * | |
1353 | * Unregister all ccw devices that are offline and on the blacklist. | |
1354 | */ | |
1355 | int ccw_purge_blacklisted(void) | |
1356 | { | |
1357 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1358 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1359 | return 0; | |
1360 | } | |
1361 | ||
1362 | void ccw_device_set_disconnected(struct ccw_device *cdev) | |
1363 | { | |
1364 | if (!cdev) | |
1365 | return; | |
1366 | ccw_device_set_timeout(cdev, 0); | |
1367 | cdev->private->flags.fake_irb = 0; | |
1368 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1369 | if (cdev->online) | |
1370 | ccw_device_schedule_recovery(); | |
1371 | } | |
1372 | ||
1373 | void ccw_device_set_notoper(struct ccw_device *cdev) | |
1374 | { | |
1375 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1376 | ||
1377 | CIO_TRACE_EVENT(2, "notoper"); | |
1378 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); | |
1379 | ccw_device_set_timeout(cdev, 0); | |
1380 | cio_disable_subchannel(sch); | |
1381 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1382 | } | |
1383 | ||
1384 | enum io_sch_action { | |
1385 | IO_SCH_UNREG, | |
1386 | IO_SCH_ORPH_UNREG, | |
1387 | IO_SCH_ATTACH, | |
1388 | IO_SCH_UNREG_ATTACH, | |
1389 | IO_SCH_ORPH_ATTACH, | |
1390 | IO_SCH_REPROBE, | |
1391 | IO_SCH_VERIFY, | |
1392 | IO_SCH_DISC, | |
1393 | IO_SCH_NOP, | |
1394 | }; | |
1395 | ||
1396 | static enum io_sch_action sch_get_action(struct subchannel *sch) | |
1397 | { | |
1398 | struct ccw_device *cdev; | |
1399 | ||
1400 | cdev = sch_get_cdev(sch); | |
1401 | if (cio_update_schib(sch)) { | |
1402 | /* Not operational. */ | |
1403 | if (!cdev) | |
1404 | return IO_SCH_UNREG; | |
1405 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) | |
1406 | return IO_SCH_UNREG; | |
1407 | return IO_SCH_ORPH_UNREG; | |
1408 | } | |
1409 | /* Operational. */ | |
1410 | if (!cdev) | |
1411 | return IO_SCH_ATTACH; | |
1412 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1413 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) | |
1414 | return IO_SCH_UNREG_ATTACH; | |
1415 | return IO_SCH_ORPH_ATTACH; | |
1416 | } | |
1417 | if ((sch->schib.pmcw.pam & sch->opm) == 0) { | |
1418 | if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) | |
1419 | return IO_SCH_UNREG; | |
1420 | return IO_SCH_DISC; | |
1421 | } | |
1422 | if (device_is_disconnected(cdev)) | |
1423 | return IO_SCH_REPROBE; | |
1424 | if (cdev->online) | |
1425 | return IO_SCH_VERIFY; | |
1426 | if (cdev->private->state == DEV_STATE_NOT_OPER) | |
1427 | return IO_SCH_UNREG_ATTACH; | |
1428 | return IO_SCH_NOP; | |
1429 | } | |
1430 | ||
1431 | /** | |
1432 | * io_subchannel_sch_event - process subchannel event | |
1433 | * @sch: subchannel | |
1434 | * @process: non-zero if function is called in process context | |
1435 | * | |
1436 | * An unspecified event occurred for this subchannel. Adjust data according | |
1437 | * to the current operational state of the subchannel and device. Return | |
1438 | * zero when the event has been handled sufficiently or -EAGAIN when this | |
1439 | * function should be called again in process context. | |
1440 | */ | |
1441 | static int io_subchannel_sch_event(struct subchannel *sch, int process) | |
1442 | { | |
1443 | unsigned long flags; | |
1444 | struct ccw_device *cdev; | |
1445 | struct ccw_dev_id dev_id; | |
1446 | enum io_sch_action action; | |
1447 | int rc = -EAGAIN; | |
1448 | ||
1449 | spin_lock_irqsave(sch->lock, flags); | |
1450 | if (!device_is_registered(&sch->dev)) | |
1451 | goto out_unlock; | |
1452 | if (work_pending(&sch->todo_work)) | |
1453 | goto out_unlock; | |
1454 | cdev = sch_get_cdev(sch); | |
1455 | if (cdev && work_pending(&cdev->private->todo_work)) | |
1456 | goto out_unlock; | |
1457 | action = sch_get_action(sch); | |
1458 | CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", | |
1459 | sch->schid.ssid, sch->schid.sch_no, process, | |
1460 | action); | |
1461 | /* Perform immediate actions while holding the lock. */ | |
1462 | switch (action) { | |
1463 | case IO_SCH_REPROBE: | |
1464 | /* Trigger device recognition. */ | |
1465 | ccw_device_trigger_reprobe(cdev); | |
1466 | rc = 0; | |
1467 | goto out_unlock; | |
1468 | case IO_SCH_VERIFY: | |
1469 | /* Trigger path verification. */ | |
1470 | io_subchannel_verify(sch); | |
1471 | rc = 0; | |
1472 | goto out_unlock; | |
1473 | case IO_SCH_DISC: | |
1474 | ccw_device_set_disconnected(cdev); | |
1475 | rc = 0; | |
1476 | goto out_unlock; | |
1477 | case IO_SCH_ORPH_UNREG: | |
1478 | case IO_SCH_ORPH_ATTACH: | |
1479 | ccw_device_set_disconnected(cdev); | |
1480 | break; | |
1481 | case IO_SCH_UNREG_ATTACH: | |
1482 | case IO_SCH_UNREG: | |
1483 | if (!cdev) | |
1484 | break; | |
1485 | if (cdev->private->state == DEV_STATE_SENSE_ID) { | |
1486 | /* | |
1487 | * Note: delayed work triggered by this event | |
1488 | * and repeated calls to sch_event are synchronized | |
1489 | * by the above check for work_pending(cdev). | |
1490 | */ | |
1491 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
1492 | } else | |
1493 | ccw_device_set_notoper(cdev); | |
1494 | break; | |
1495 | case IO_SCH_NOP: | |
1496 | rc = 0; | |
1497 | goto out_unlock; | |
1498 | default: | |
1499 | break; | |
1500 | } | |
1501 | spin_unlock_irqrestore(sch->lock, flags); | |
1502 | /* All other actions require process context. */ | |
1503 | if (!process) | |
1504 | goto out; | |
1505 | /* Handle attached ccw device. */ | |
1506 | switch (action) { | |
1507 | case IO_SCH_ORPH_UNREG: | |
1508 | case IO_SCH_ORPH_ATTACH: | |
1509 | /* Move ccw device to orphanage. */ | |
1510 | rc = ccw_device_move_to_orph(cdev); | |
1511 | if (rc) | |
1512 | goto out; | |
1513 | break; | |
1514 | case IO_SCH_UNREG_ATTACH: | |
1515 | spin_lock_irqsave(sch->lock, flags); | |
1516 | sch_set_cdev(sch, NULL); | |
1517 | spin_unlock_irqrestore(sch->lock, flags); | |
1518 | /* Unregister ccw device. */ | |
1519 | ccw_device_unregister(cdev); | |
1520 | break; | |
1521 | default: | |
1522 | break; | |
1523 | } | |
1524 | /* Handle subchannel. */ | |
1525 | switch (action) { | |
1526 | case IO_SCH_ORPH_UNREG: | |
1527 | case IO_SCH_UNREG: | |
1528 | css_sch_device_unregister(sch); | |
1529 | break; | |
1530 | case IO_SCH_ORPH_ATTACH: | |
1531 | case IO_SCH_UNREG_ATTACH: | |
1532 | case IO_SCH_ATTACH: | |
1533 | dev_id.ssid = sch->schid.ssid; | |
1534 | dev_id.devno = sch->schib.pmcw.dev; | |
1535 | cdev = get_ccwdev_by_dev_id(&dev_id); | |
1536 | if (!cdev) { | |
1537 | sch_create_and_recog_new_device(sch); | |
1538 | break; | |
1539 | } | |
1540 | rc = ccw_device_move_to_sch(cdev, sch); | |
1541 | if (rc) { | |
1542 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1543 | put_device(&cdev->dev); | |
1544 | goto out; | |
1545 | } | |
1546 | spin_lock_irqsave(sch->lock, flags); | |
1547 | ccw_device_trigger_reprobe(cdev); | |
1548 | spin_unlock_irqrestore(sch->lock, flags); | |
1549 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1550 | put_device(&cdev->dev); | |
1551 | break; | |
1552 | default: | |
1553 | break; | |
1554 | } | |
1555 | return 0; | |
1556 | ||
1557 | out_unlock: | |
1558 | spin_unlock_irqrestore(sch->lock, flags); | |
1559 | out: | |
1560 | return rc; | |
1561 | } | |
1562 | ||
1563 | static void ccw_device_set_int_class(struct ccw_device *cdev) | |
1564 | { | |
1565 | struct ccw_driver *cdrv = cdev->drv; | |
1566 | ||
1567 | /* Note: we interpret class 0 in this context as an uninitialized | |
1568 | * field since it translates to a non-I/O interrupt class. */ | |
1569 | if (cdrv->int_class != 0) | |
1570 | cdev->private->int_class = cdrv->int_class; | |
1571 | else | |
1572 | cdev->private->int_class = IRQIO_CIO; | |
1573 | } | |
1574 | ||
1575 | #ifdef CONFIG_CCW_CONSOLE | |
1576 | int __init ccw_device_enable_console(struct ccw_device *cdev) | |
1577 | { | |
1578 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1579 | int rc; | |
1580 | ||
1581 | if (!cdev->drv || !cdev->handler) | |
1582 | return -EINVAL; | |
1583 | ||
1584 | io_subchannel_init_fields(sch); | |
1585 | rc = cio_commit_config(sch); | |
1586 | if (rc) | |
1587 | return rc; | |
1588 | sch->driver = &io_subchannel_driver; | |
1589 | io_subchannel_recog(cdev, sch); | |
1590 | /* Now wait for the async. recognition to come to an end. */ | |
1591 | spin_lock_irq(cdev->ccwlock); | |
1592 | while (!dev_fsm_final_state(cdev)) | |
1593 | ccw_device_wait_idle(cdev); | |
1594 | ||
1595 | /* Hold on to an extra reference while device is online. */ | |
1596 | get_device(&cdev->dev); | |
1597 | rc = ccw_device_online(cdev); | |
1598 | if (rc) | |
1599 | goto out_unlock; | |
1600 | ||
1601 | while (!dev_fsm_final_state(cdev)) | |
1602 | ccw_device_wait_idle(cdev); | |
1603 | ||
1604 | if (cdev->private->state == DEV_STATE_ONLINE) | |
1605 | cdev->online = 1; | |
1606 | else | |
1607 | rc = -EIO; | |
1608 | out_unlock: | |
1609 | spin_unlock_irq(cdev->ccwlock); | |
1610 | if (rc) /* Give up online reference since onlining failed. */ | |
1611 | put_device(&cdev->dev); | |
1612 | return rc; | |
1613 | } | |
1614 | ||
1615 | struct ccw_device * __init ccw_device_create_console(struct ccw_driver *drv) | |
1616 | { | |
1617 | struct io_subchannel_private *io_priv; | |
1618 | struct ccw_device *cdev; | |
1619 | struct subchannel *sch; | |
1620 | ||
1621 | sch = cio_probe_console(); | |
1622 | if (IS_ERR(sch)) | |
1623 | return ERR_CAST(sch); | |
1624 | ||
1625 | io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); | |
1626 | if (!io_priv) | |
1627 | goto err_priv; | |
1628 | io_priv->dma_area = dma_alloc_coherent(&sch->dev, | |
1629 | sizeof(*io_priv->dma_area), | |
1630 | &io_priv->dma_area_dma, GFP_KERNEL); | |
1631 | if (!io_priv->dma_area) | |
1632 | goto err_dma_area; | |
1633 | set_io_private(sch, io_priv); | |
1634 | cdev = io_subchannel_create_ccwdev(sch); | |
1635 | if (IS_ERR(cdev)) { | |
1636 | dma_free_coherent(&sch->dev, sizeof(*io_priv->dma_area), | |
1637 | io_priv->dma_area, io_priv->dma_area_dma); | |
1638 | set_io_private(sch, NULL); | |
1639 | put_device(&sch->dev); | |
1640 | kfree(io_priv); | |
1641 | return cdev; | |
1642 | } | |
1643 | cdev->drv = drv; | |
1644 | ccw_device_set_int_class(cdev); | |
1645 | return cdev; | |
1646 | ||
1647 | err_dma_area: | |
1648 | kfree(io_priv); | |
1649 | err_priv: | |
1650 | put_device(&sch->dev); | |
1651 | return ERR_PTR(-ENOMEM); | |
1652 | } | |
1653 | ||
1654 | void __init ccw_device_destroy_console(struct ccw_device *cdev) | |
1655 | { | |
1656 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1657 | struct io_subchannel_private *io_priv = to_io_private(sch); | |
1658 | ||
1659 | set_io_private(sch, NULL); | |
1660 | dma_free_coherent(&sch->dev, sizeof(*io_priv->dma_area), | |
1661 | io_priv->dma_area, io_priv->dma_area_dma); | |
1662 | put_device(&sch->dev); | |
1663 | put_device(&cdev->dev); | |
1664 | kfree(io_priv); | |
1665 | } | |
1666 | ||
1667 | /** | |
1668 | * ccw_device_wait_idle() - busy wait for device to become idle | |
1669 | * @cdev: ccw device | |
1670 | * | |
1671 | * Poll until activity control is zero, that is, no function or data | |
1672 | * transfer is pending/active. | |
1673 | * Called with device lock being held. | |
1674 | */ | |
1675 | void ccw_device_wait_idle(struct ccw_device *cdev) | |
1676 | { | |
1677 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1678 | ||
1679 | while (1) { | |
1680 | cio_tsch(sch); | |
1681 | if (sch->schib.scsw.cmd.actl == 0) | |
1682 | break; | |
1683 | udelay(100); | |
1684 | } | |
1685 | } | |
1686 | #endif | |
1687 | ||
1688 | /** | |
1689 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1690 | * @cdrv: driver the device is owned by | |
1691 | * @bus_id: bus id of the device to be searched | |
1692 | * | |
1693 | * This function searches all devices owned by @cdrv for a device with a bus | |
1694 | * id matching @bus_id. | |
1695 | * Returns: | |
1696 | * If a match is found, its reference count of the found device is increased | |
1697 | * and it is returned; else %NULL is returned. | |
1698 | */ | |
1699 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1700 | const char *bus_id) | |
1701 | { | |
1702 | struct device *dev; | |
1703 | ||
1704 | dev = driver_find_device_by_name(&cdrv->driver, bus_id); | |
1705 | ||
1706 | return dev ? to_ccwdev(dev) : NULL; | |
1707 | } | |
1708 | ||
1709 | /************************** device driver handling ************************/ | |
1710 | ||
1711 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1712 | * and release methods are initially very similar to the device_driver | |
1713 | * implementations, with the difference that they have ccw_device | |
1714 | * arguments. | |
1715 | * | |
1716 | * A ccw driver also contains the information that is needed for | |
1717 | * device matching. | |
1718 | */ | |
1719 | static int | |
1720 | ccw_device_probe (struct device *dev) | |
1721 | { | |
1722 | struct ccw_device *cdev = to_ccwdev(dev); | |
1723 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1724 | int ret; | |
1725 | ||
1726 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1727 | ccw_device_set_int_class(cdev); | |
1728 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1729 | if (ret) { | |
1730 | cdev->drv = NULL; | |
1731 | cdev->private->int_class = IRQIO_CIO; | |
1732 | return ret; | |
1733 | } | |
1734 | ||
1735 | return 0; | |
1736 | } | |
1737 | ||
1738 | static int ccw_device_remove(struct device *dev) | |
1739 | { | |
1740 | struct ccw_device *cdev = to_ccwdev(dev); | |
1741 | struct ccw_driver *cdrv = cdev->drv; | |
1742 | struct subchannel *sch; | |
1743 | int ret; | |
1744 | ||
1745 | if (cdrv->remove) | |
1746 | cdrv->remove(cdev); | |
1747 | ||
1748 | spin_lock_irq(cdev->ccwlock); | |
1749 | if (cdev->online) { | |
1750 | cdev->online = 0; | |
1751 | ret = ccw_device_offline(cdev); | |
1752 | spin_unlock_irq(cdev->ccwlock); | |
1753 | if (ret == 0) | |
1754 | wait_event(cdev->private->wait_q, | |
1755 | dev_fsm_final_state(cdev)); | |
1756 | else | |
1757 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " | |
1758 | "device 0.%x.%04x\n", | |
1759 | ret, cdev->private->dev_id.ssid, | |
1760 | cdev->private->dev_id.devno); | |
1761 | /* Give up reference obtained in ccw_device_set_online(). */ | |
1762 | put_device(&cdev->dev); | |
1763 | spin_lock_irq(cdev->ccwlock); | |
1764 | } | |
1765 | ccw_device_set_timeout(cdev, 0); | |
1766 | cdev->drv = NULL; | |
1767 | cdev->private->int_class = IRQIO_CIO; | |
1768 | sch = to_subchannel(cdev->dev.parent); | |
1769 | spin_unlock_irq(cdev->ccwlock); | |
1770 | io_subchannel_quiesce(sch); | |
1771 | __disable_cmf(cdev); | |
1772 | ||
1773 | return 0; | |
1774 | } | |
1775 | ||
1776 | static void ccw_device_shutdown(struct device *dev) | |
1777 | { | |
1778 | struct ccw_device *cdev; | |
1779 | ||
1780 | cdev = to_ccwdev(dev); | |
1781 | if (cdev->drv && cdev->drv->shutdown) | |
1782 | cdev->drv->shutdown(cdev); | |
1783 | __disable_cmf(cdev); | |
1784 | } | |
1785 | ||
1786 | static struct bus_type ccw_bus_type = { | |
1787 | .name = "ccw", | |
1788 | .match = ccw_bus_match, | |
1789 | .uevent = ccw_uevent, | |
1790 | .probe = ccw_device_probe, | |
1791 | .remove = ccw_device_remove, | |
1792 | .shutdown = ccw_device_shutdown, | |
1793 | }; | |
1794 | ||
1795 | /** | |
1796 | * ccw_driver_register() - register a ccw driver | |
1797 | * @cdriver: driver to be registered | |
1798 | * | |
1799 | * This function is mainly a wrapper around driver_register(). | |
1800 | * Returns: | |
1801 | * %0 on success and a negative error value on failure. | |
1802 | */ | |
1803 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1804 | { | |
1805 | struct device_driver *drv = &cdriver->driver; | |
1806 | ||
1807 | drv->bus = &ccw_bus_type; | |
1808 | ||
1809 | return driver_register(drv); | |
1810 | } | |
1811 | ||
1812 | /** | |
1813 | * ccw_driver_unregister() - deregister a ccw driver | |
1814 | * @cdriver: driver to be deregistered | |
1815 | * | |
1816 | * This function is mainly a wrapper around driver_unregister(). | |
1817 | */ | |
1818 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1819 | { | |
1820 | driver_unregister(&cdriver->driver); | |
1821 | } | |
1822 | ||
1823 | static void ccw_device_todo(struct work_struct *work) | |
1824 | { | |
1825 | struct ccw_device_private *priv; | |
1826 | struct ccw_device *cdev; | |
1827 | struct subchannel *sch; | |
1828 | enum cdev_todo todo; | |
1829 | ||
1830 | priv = container_of(work, struct ccw_device_private, todo_work); | |
1831 | cdev = priv->cdev; | |
1832 | sch = to_subchannel(cdev->dev.parent); | |
1833 | /* Find out todo. */ | |
1834 | spin_lock_irq(cdev->ccwlock); | |
1835 | todo = priv->todo; | |
1836 | priv->todo = CDEV_TODO_NOTHING; | |
1837 | CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n", | |
1838 | priv->dev_id.ssid, priv->dev_id.devno, todo); | |
1839 | spin_unlock_irq(cdev->ccwlock); | |
1840 | /* Perform todo. */ | |
1841 | switch (todo) { | |
1842 | case CDEV_TODO_ENABLE_CMF: | |
1843 | cmf_reenable(cdev); | |
1844 | break; | |
1845 | case CDEV_TODO_REBIND: | |
1846 | ccw_device_do_unbind_bind(cdev); | |
1847 | break; | |
1848 | case CDEV_TODO_REGISTER: | |
1849 | io_subchannel_register(cdev); | |
1850 | break; | |
1851 | case CDEV_TODO_UNREG_EVAL: | |
1852 | if (!sch_is_pseudo_sch(sch)) | |
1853 | css_schedule_eval(sch->schid); | |
1854 | fallthrough; | |
1855 | case CDEV_TODO_UNREG: | |
1856 | if (sch_is_pseudo_sch(sch)) | |
1857 | ccw_device_unregister(cdev); | |
1858 | else | |
1859 | ccw_device_call_sch_unregister(cdev); | |
1860 | break; | |
1861 | default: | |
1862 | break; | |
1863 | } | |
1864 | /* Release workqueue ref. */ | |
1865 | put_device(&cdev->dev); | |
1866 | } | |
1867 | ||
1868 | /** | |
1869 | * ccw_device_sched_todo - schedule ccw device operation | |
1870 | * @cdev: ccw device | |
1871 | * @todo: todo | |
1872 | * | |
1873 | * Schedule the operation identified by @todo to be performed on the slow path | |
1874 | * workqueue. Do nothing if another operation with higher priority is already | |
1875 | * scheduled. Needs to be called with ccwdev lock held. | |
1876 | */ | |
1877 | void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo) | |
1878 | { | |
1879 | CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n", | |
1880 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
1881 | todo); | |
1882 | if (cdev->private->todo >= todo) | |
1883 | return; | |
1884 | cdev->private->todo = todo; | |
1885 | /* Get workqueue ref. */ | |
1886 | if (!get_device(&cdev->dev)) | |
1887 | return; | |
1888 | if (!queue_work(cio_work_q, &cdev->private->todo_work)) { | |
1889 | /* Already queued, release workqueue ref. */ | |
1890 | put_device(&cdev->dev); | |
1891 | } | |
1892 | } | |
1893 | ||
1894 | /** | |
1895 | * ccw_device_siosl() - initiate logging | |
1896 | * @cdev: ccw device | |
1897 | * | |
1898 | * This function is used to invoke model-dependent logging within the channel | |
1899 | * subsystem. | |
1900 | */ | |
1901 | int ccw_device_siosl(struct ccw_device *cdev) | |
1902 | { | |
1903 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1904 | ||
1905 | return chsc_siosl(sch->schid); | |
1906 | } | |
1907 | EXPORT_SYMBOL_GPL(ccw_device_siosl); | |
1908 | ||
1909 | EXPORT_SYMBOL(ccw_device_set_online); | |
1910 | EXPORT_SYMBOL(ccw_device_set_offline); | |
1911 | EXPORT_SYMBOL(ccw_driver_register); | |
1912 | EXPORT_SYMBOL(ccw_driver_unregister); | |
1913 | EXPORT_SYMBOL(get_ccwdev_by_busid); |