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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" |
fd0457a6 | 39 | #include "chsc.h" |
1da177e4 | 40 | |
90ab1336 | 41 | static struct timer_list recovery_timer; |
486d0a00 | 42 | static DEFINE_SPINLOCK(recovery_lock); |
90ab1336 PO |
43 | static int recovery_phase; |
44 | static const unsigned long recovery_delay[] = { 3, 30, 300 }; | |
45 | ||
1da177e4 LT |
46 | /******************* bus type handling ***********************/ |
47 | ||
48 | /* The Linux driver model distinguishes between a bus type and | |
49 | * the bus itself. Of course we only have one channel | |
50 | * subsystem driver and one channel system per machine, but | |
51 | * we still use the abstraction. T.R. says it's a good idea. */ | |
52 | static int | |
53 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
54 | { | |
55 | struct ccw_device *cdev = to_ccwdev(dev); | |
56 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
57 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
58 | ||
59 | if (!ids) | |
60 | return 0; | |
61 | ||
62 | found = ccw_device_id_match(ids, &cdev->id); | |
63 | if (!found) | |
64 | return 0; | |
65 | ||
66 | cdev->id.driver_info = found->driver_info; | |
67 | ||
68 | return 1; | |
69 | } | |
70 | ||
db0c2d59 PO |
71 | /* Store modalias string delimited by prefix/suffix string into buffer with |
72 | * specified size. Return length of resulting string (excluding trailing '\0') | |
73 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 74 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 75 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 76 | { |
db0c2d59 | 77 | int len; |
1da177e4 | 78 | |
cfbe9bb2 | 79 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
80 | if (len > size) |
81 | return len; | |
82 | buf += len; | |
83 | size -= len; | |
1da177e4 | 84 | |
db0c2d59 PO |
85 | if (id->dev_type != 0) |
86 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
87 | id->dev_model, suffix); | |
88 | else | |
89 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 90 | |
db0c2d59 PO |
91 | return len; |
92 | } | |
93 | ||
94 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
95 | * non-zero otherwise. */ | |
7eff2e7a | 96 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
97 | { |
98 | struct ccw_device *cdev = to_ccwdev(dev); | |
99 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
100 | int ret; |
101 | char modalias_buf[30]; | |
1da177e4 | 102 | |
db0c2d59 | 103 | /* CU_TYPE= */ |
7eff2e7a | 104 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
105 | if (ret) |
106 | return ret; | |
db0c2d59 PO |
107 | |
108 | /* CU_MODEL= */ | |
7eff2e7a | 109 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
110 | if (ret) |
111 | return ret; | |
1da177e4 LT |
112 | |
113 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 114 | /* DEV_TYPE= */ |
7eff2e7a | 115 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
116 | if (ret) |
117 | return ret; | |
1da177e4 | 118 | |
db0c2d59 | 119 | /* DEV_MODEL= */ |
7eff2e7a | 120 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
121 | if (ret) |
122 | return ret; | |
db0c2d59 PO |
123 | |
124 | /* MODALIAS= */ | |
cfbe9bb2 | 125 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
126 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
127 | return ret; | |
1da177e4 LT |
128 | } |
129 | ||
8bbace7e | 130 | struct bus_type ccw_bus_type; |
1da177e4 | 131 | |
602b20f2 CH |
132 | static void io_subchannel_irq(struct subchannel *); |
133 | static int io_subchannel_probe(struct subchannel *); | |
134 | static int io_subchannel_remove(struct subchannel *); | |
8bbace7e | 135 | static void io_subchannel_shutdown(struct subchannel *); |
c820de39 | 136 | static int io_subchannel_sch_event(struct subchannel *, int); |
99611f87 CH |
137 | static int io_subchannel_chp_event(struct subchannel *, struct chp_link *, |
138 | int); | |
8ea7f559 | 139 | static void recovery_func(unsigned long data); |
8ea7f559 SO |
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 | ||
b4c70721 | 162 | static int io_subchannel_settle(void) |
8ea7f559 | 163 | { |
b4c70721 SO |
164 | int ret; |
165 | ||
166 | ret = wait_event_interruptible(ccw_device_init_wq, | |
167 | atomic_read(&ccw_device_init_count) == 0); | |
168 | if (ret) | |
169 | return -EINTR; | |
be5d3823 | 170 | flush_workqueue(cio_work_q); |
b4c70721 | 171 | return 0; |
8ea7f559 SO |
172 | } |
173 | ||
f7e5d67c | 174 | static struct css_driver io_subchannel_driver = { |
4beee646 | 175 | .owner = THIS_MODULE, |
f08adc00 | 176 | .subchannel_type = io_subchannel_ids, |
25b7bb58 | 177 | .name = "io_subchannel", |
1da177e4 | 178 | .irq = io_subchannel_irq, |
c820de39 CH |
179 | .sch_event = io_subchannel_sch_event, |
180 | .chp_event = io_subchannel_chp_event, | |
8bbace7e CH |
181 | .probe = io_subchannel_probe, |
182 | .remove = io_subchannel_remove, | |
183 | .shutdown = io_subchannel_shutdown, | |
93a27592 | 184 | .prepare = io_subchannel_prepare, |
8ea7f559 | 185 | .settle = io_subchannel_settle, |
1da177e4 LT |
186 | }; |
187 | ||
2f17644d | 188 | int __init io_subchannel_init(void) |
1da177e4 LT |
189 | { |
190 | int ret; | |
191 | ||
192 | init_waitqueue_head(&ccw_device_init_wq); | |
193 | atomic_set(&ccw_device_init_count, 0); | |
90ab1336 | 194 | setup_timer(&recovery_timer, recovery_func, 0); |
1da177e4 | 195 | |
be5d3823 SO |
196 | ret = bus_register(&ccw_bus_type); |
197 | if (ret) | |
198 | return ret; | |
25b7bb58 CH |
199 | ret = css_driver_register(&io_subchannel_driver); |
200 | if (ret) | |
be5d3823 | 201 | bus_unregister(&ccw_bus_type); |
1da177e4 | 202 | |
1da177e4 LT |
203 | return ret; |
204 | } | |
205 | ||
1da177e4 LT |
206 | |
207 | /************************ device handling **************************/ | |
208 | ||
209 | /* | |
210 | * A ccw_device has some interfaces in sysfs in addition to the | |
211 | * standard ones. | |
212 | * The following entries are designed to export the information which | |
213 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
214 | * are obvious, so they don't have an entry :) | |
215 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
216 | */ | |
217 | static ssize_t | |
3fd3c0a5 | 218 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
219 | { |
220 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 221 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
222 | ssize_t ret = 0; |
223 | int chp; | |
7ad6a249 PO |
224 | int mask; |
225 | ||
226 | for (chp = 0; chp < 8; chp++) { | |
227 | mask = 0x80 >> chp; | |
228 | if (ssd->path_mask & mask) | |
229 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
230 | else | |
231 | ret += sprintf(buf + ret, "00 "); | |
232 | } | |
1da177e4 LT |
233 | ret += sprintf (buf+ret, "\n"); |
234 | return min((ssize_t)PAGE_SIZE, ret); | |
235 | } | |
236 | ||
237 | static ssize_t | |
3fd3c0a5 | 238 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
239 | { |
240 | struct subchannel *sch = to_subchannel(dev); | |
241 | struct pmcw *pmcw = &sch->schib.pmcw; | |
242 | ||
243 | return sprintf (buf, "%02x %02x %02x\n", | |
244 | pmcw->pim, pmcw->pam, pmcw->pom); | |
245 | } | |
246 | ||
247 | static ssize_t | |
3fd3c0a5 | 248 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
249 | { |
250 | struct ccw_device *cdev = to_ccwdev(dev); | |
251 | struct ccw_device_id *id = &(cdev->id); | |
252 | ||
253 | if (id->dev_type != 0) | |
254 | return sprintf(buf, "%04x/%02x\n", | |
255 | id->dev_type, id->dev_model); | |
256 | else | |
257 | return sprintf(buf, "n/a\n"); | |
258 | } | |
259 | ||
260 | static ssize_t | |
3fd3c0a5 | 261 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
262 | { |
263 | struct ccw_device *cdev = to_ccwdev(dev); | |
264 | struct ccw_device_id *id = &(cdev->id); | |
265 | ||
266 | return sprintf(buf, "%04x/%02x\n", | |
267 | id->cu_type, id->cu_model); | |
268 | } | |
269 | ||
f1fc78a8 BB |
270 | static ssize_t |
271 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
272 | { | |
273 | struct ccw_device *cdev = to_ccwdev(dev); | |
274 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 275 | int len; |
f1fc78a8 | 276 | |
086a6c62 | 277 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
278 | |
279 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
280 | } |
281 | ||
1da177e4 | 282 | static ssize_t |
3fd3c0a5 | 283 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
284 | { |
285 | struct ccw_device *cdev = to_ccwdev(dev); | |
286 | ||
287 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
288 | } | |
289 | ||
d7b5a4c9 CH |
290 | int ccw_device_is_orphan(struct ccw_device *cdev) |
291 | { | |
292 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
293 | } | |
294 | ||
ef99516c | 295 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 296 | { |
7d253b9a | 297 | if (device_is_registered(&cdev->dev)) { |
24a1872d | 298 | /* Undo device_add(). */ |
ef99516c | 299 | device_del(&cdev->dev); |
24a1872d SO |
300 | } |
301 | if (cdev->private->flags.initialized) { | |
302 | cdev->private->flags.initialized = 0; | |
3b554a14 SO |
303 | /* Release reference from device_initialize(). */ |
304 | put_device(&cdev->dev); | |
305 | } | |
7674da77 CH |
306 | } |
307 | ||
d40f7b75 SO |
308 | static void io_subchannel_quiesce(struct subchannel *); |
309 | ||
b2ffd8e9 CH |
310 | /** |
311 | * ccw_device_set_offline() - disable a ccw device for I/O | |
312 | * @cdev: target ccw device | |
313 | * | |
314 | * This function calls the driver's set_offline() function for @cdev, if | |
315 | * given, and then disables @cdev. | |
316 | * Returns: | |
317 | * %0 on success and a negative error value on failure. | |
318 | * Context: | |
319 | * enabled, ccw device lock not held | |
320 | */ | |
321 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 | 322 | { |
d40f7b75 SO |
323 | struct subchannel *sch; |
324 | int ret, state; | |
1da177e4 LT |
325 | |
326 | if (!cdev) | |
327 | return -ENODEV; | |
328 | if (!cdev->online || !cdev->drv) | |
329 | return -EINVAL; | |
330 | ||
331 | if (cdev->drv->set_offline) { | |
332 | ret = cdev->drv->set_offline(cdev); | |
333 | if (ret != 0) | |
334 | return ret; | |
335 | } | |
336 | cdev->online = 0; | |
337 | spin_lock_irq(cdev->ccwlock); | |
d40f7b75 | 338 | sch = to_subchannel(cdev->dev.parent); |
217ee6c6 ME |
339 | /* Wait until a final state or DISCONNECTED is reached */ |
340 | while (!dev_fsm_final_state(cdev) && | |
341 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
1da177e4 | 342 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
343 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
344 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
345 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 | 346 | } |
d40f7b75 SO |
347 | do { |
348 | ret = ccw_device_offline(cdev); | |
349 | if (!ret) | |
350 | break; | |
351 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device " | |
352 | "0.%x.%04x\n", ret, cdev->private->dev_id.ssid, | |
353 | cdev->private->dev_id.devno); | |
354 | if (ret != -EBUSY) | |
355 | goto error; | |
356 | state = cdev->private->state; | |
357 | spin_unlock_irq(cdev->ccwlock); | |
358 | io_subchannel_quiesce(sch); | |
359 | spin_lock_irq(cdev->ccwlock); | |
360 | cdev->private->state = state; | |
361 | } while (ret == -EBUSY); | |
1da177e4 | 362 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
363 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
364 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
a7ae2c02 PO |
365 | /* Inform the user if set offline failed. */ |
366 | if (cdev->private->state == DEV_STATE_BOXED) { | |
367 | pr_warning("%s: The device entered boxed state while " | |
368 | "being set offline\n", dev_name(&cdev->dev)); | |
369 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
370 | pr_warning("%s: The device stopped operating while " | |
371 | "being set offline\n", dev_name(&cdev->dev)); | |
372 | } | |
217ee6c6 ME |
373 | /* Give up reference from ccw_device_set_online(). */ |
374 | put_device(&cdev->dev); | |
375 | return 0; | |
376 | ||
377 | error: | |
217ee6c6 ME |
378 | cdev->private->state = DEV_STATE_OFFLINE; |
379 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
380 | spin_unlock_irq(cdev->ccwlock); | |
381 | /* Give up reference from ccw_device_set_online(). */ | |
382 | put_device(&cdev->dev); | |
383 | return -ENODEV; | |
1da177e4 LT |
384 | } |
385 | ||
b2ffd8e9 CH |
386 | /** |
387 | * ccw_device_set_online() - enable a ccw device for I/O | |
388 | * @cdev: target ccw device | |
389 | * | |
390 | * This function first enables @cdev and then calls the driver's set_online() | |
391 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
392 | * disabled again. | |
393 | * Returns: | |
394 | * %0 on success and a negative error value on failure. | |
395 | * Context: | |
396 | * enabled, ccw device lock not held | |
397 | */ | |
398 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
399 | { |
400 | int ret; | |
217ee6c6 | 401 | int ret2; |
1da177e4 LT |
402 | |
403 | if (!cdev) | |
404 | return -ENODEV; | |
405 | if (cdev->online || !cdev->drv) | |
406 | return -EINVAL; | |
9cd67421 CH |
407 | /* Hold on to an extra reference while device is online. */ |
408 | if (!get_device(&cdev->dev)) | |
409 | return -ENODEV; | |
1da177e4 LT |
410 | |
411 | spin_lock_irq(cdev->ccwlock); | |
412 | ret = ccw_device_online(cdev); | |
413 | spin_unlock_irq(cdev->ccwlock); | |
414 | if (ret == 0) | |
415 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
416 | else { | |
139b83dd | 417 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
418 | "device 0.%x.%04x\n", |
419 | ret, cdev->private->dev_id.ssid, | |
420 | cdev->private->dev_id.devno); | |
9cd67421 CH |
421 | /* Give up online reference since onlining failed. */ |
422 | put_device(&cdev->dev); | |
1da177e4 LT |
423 | return ret; |
424 | } | |
217ee6c6 ME |
425 | spin_lock_irq(cdev->ccwlock); |
426 | /* Check if online processing was successful */ | |
427 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
428 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
429 | spin_unlock_irq(cdev->ccwlock); | |
a7ae2c02 PO |
430 | /* Inform the user that set online failed. */ |
431 | if (cdev->private->state == DEV_STATE_BOXED) { | |
432 | pr_warning("%s: Setting the device online failed " | |
433 | "because it is boxed\n", | |
434 | dev_name(&cdev->dev)); | |
435 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
436 | pr_warning("%s: Setting the device online failed " | |
437 | "because it is not operational\n", | |
438 | dev_name(&cdev->dev)); | |
439 | } | |
9cd67421 CH |
440 | /* Give up online reference since onlining failed. */ |
441 | put_device(&cdev->dev); | |
1da177e4 | 442 | return -ENODEV; |
9cd67421 | 443 | } |
217ee6c6 ME |
444 | spin_unlock_irq(cdev->ccwlock); |
445 | if (cdev->drv->set_online) | |
446 | ret = cdev->drv->set_online(cdev); | |
447 | if (ret) | |
448 | goto rollback; | |
449 | cdev->online = 1; | |
450 | return 0; | |
451 | ||
452 | rollback: | |
1da177e4 | 453 | spin_lock_irq(cdev->ccwlock); |
217ee6c6 ME |
454 | /* Wait until a final state or DISCONNECTED is reached */ |
455 | while (!dev_fsm_final_state(cdev) && | |
456 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
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 | spin_lock_irq(cdev->ccwlock); | |
461 | } | |
462 | ret2 = ccw_device_offline(cdev); | |
463 | if (ret2) | |
464 | goto error; | |
465 | spin_unlock_irq(cdev->ccwlock); | |
466 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
467 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
468 | /* Give up online reference since onlining failed. */ | |
469 | put_device(&cdev->dev); | |
470 | return ret; | |
471 | ||
472 | error: | |
473 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
474 | "device 0.%x.%04x\n", | |
475 | ret2, cdev->private->dev_id.ssid, | |
476 | cdev->private->dev_id.devno); | |
477 | cdev->private->state = DEV_STATE_OFFLINE; | |
1da177e4 | 478 | spin_unlock_irq(cdev->ccwlock); |
9cd67421 CH |
479 | /* Give up online reference since onlining failed. */ |
480 | put_device(&cdev->dev); | |
217ee6c6 | 481 | return ret; |
1da177e4 LT |
482 | } |
483 | ||
e74fe0ce | 484 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 | 485 | { |
37de53bb PO |
486 | if (cdev->private->state == DEV_STATE_DISCONNECTED) { |
487 | spin_lock_irq(cdev->ccwlock); | |
488 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); | |
489 | spin_unlock_irq(cdev->ccwlock); | |
7cd40314 SO |
490 | return 0; |
491 | } | |
492 | if (cdev->drv && cdev->drv->set_offline) | |
e74fe0ce | 493 | return ccw_device_set_offline(cdev); |
7cd40314 | 494 | return -EINVAL; |
f5ba6c86 CH |
495 | } |
496 | ||
497 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
498 | { | |
f5ba6c86 | 499 | /* Do device recognition, if needed. */ |
99f6a570 | 500 | if (cdev->private->state == DEV_STATE_BOXED) { |
1f5bd384 | 501 | spin_lock_irq(cdev->ccwlock); |
736b5db8 | 502 | ccw_device_recognition(cdev); |
1f5bd384 | 503 | spin_unlock_irq(cdev->ccwlock); |
f5ba6c86 CH |
504 | wait_event(cdev->private->wait_q, |
505 | cdev->private->flags.recog_done); | |
156013ff SO |
506 | if (cdev->private->state != DEV_STATE_OFFLINE) |
507 | /* recognition failed */ | |
508 | return -EAGAIN; | |
f5ba6c86 CH |
509 | } |
510 | if (cdev->drv && cdev->drv->set_online) | |
7cd40314 SO |
511 | return ccw_device_set_online(cdev); |
512 | return -EINVAL; | |
f5ba6c86 | 513 | } |
156013ff | 514 | |
c78aa6cb | 515 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
516 | { |
517 | int ret; | |
518 | ||
519 | ret = online_store_recog_and_online(cdev); | |
156013ff | 520 | if (ret && !force) |
c78aa6cb | 521 | return ret; |
f5ba6c86 CH |
522 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
523 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
524 | if (ret) |
525 | return ret; | |
f5ba6c86 CH |
526 | if (cdev->id.cu_type == 0) |
527 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
528 | ret = online_store_recog_and_online(cdev); |
529 | if (ret) | |
530 | return ret; | |
f5ba6c86 | 531 | } |
c78aa6cb | 532 | return 0; |
f5ba6c86 CH |
533 | } |
534 | ||
535 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
536 | const char *buf, size_t count) | |
1da177e4 LT |
537 | { |
538 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
539 | int force, ret; |
540 | unsigned long i; | |
1da177e4 | 541 | |
350e9120 PO |
542 | if (!dev_fsm_final_state(cdev) && |
543 | cdev->private->state != DEV_STATE_DISCONNECTED) | |
544 | return -EAGAIN; | |
545 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) | |
1da177e4 LT |
546 | return -EAGAIN; |
547 | ||
548 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
549 | atomic_set(&cdev->private->onoff, 0); | |
550 | return -EINVAL; | |
551 | } | |
552 | if (!strncmp(buf, "force\n", count)) { | |
553 | force = 1; | |
554 | i = 1; | |
2f972202 | 555 | ret = 0; |
1da177e4 LT |
556 | } else { |
557 | force = 0; | |
2f972202 | 558 | ret = strict_strtoul(buf, 16, &i); |
1da177e4 | 559 | } |
2f972202 CH |
560 | if (ret) |
561 | goto out; | |
f5ba6c86 CH |
562 | switch (i) { |
563 | case 0: | |
e74fe0ce | 564 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
565 | break; |
566 | case 1: | |
c78aa6cb | 567 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
568 | break; |
569 | default: | |
2f972202 | 570 | ret = -EINVAL; |
1da177e4 | 571 | } |
2f972202 | 572 | out: |
1da177e4 LT |
573 | if (cdev->drv) |
574 | module_put(cdev->drv->owner); | |
575 | atomic_set(&cdev->private->onoff, 0); | |
e74fe0ce | 576 | return (ret < 0) ? ret : count; |
1da177e4 LT |
577 | } |
578 | ||
579 | static ssize_t | |
3fd3c0a5 | 580 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
581 | { |
582 | struct ccw_device *cdev = to_ccwdev(dev); | |
583 | struct subchannel *sch; | |
584 | ||
d7b5a4c9 CH |
585 | if (ccw_device_is_orphan(cdev)) |
586 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
587 | switch (cdev->private->state) { |
588 | case DEV_STATE_BOXED: | |
589 | return sprintf(buf, "boxed\n"); | |
590 | case DEV_STATE_DISCONNECTED: | |
591 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
592 | case DEV_STATE_NOT_OPER: | |
593 | sch = to_subchannel(dev->parent); | |
594 | if (!sch->lpm) | |
595 | return sprintf(buf, "no path\n"); | |
596 | else | |
597 | return sprintf(buf, "no device\n"); | |
598 | default: | |
599 | /* All other states considered fine. */ | |
600 | return sprintf(buf, "good\n"); | |
601 | } | |
602 | } | |
603 | ||
fd0457a6 ME |
604 | static ssize_t |
605 | initiate_logging(struct device *dev, struct device_attribute *attr, | |
606 | const char *buf, size_t count) | |
607 | { | |
608 | struct subchannel *sch = to_subchannel(dev); | |
609 | int rc; | |
610 | ||
611 | rc = chsc_siosl(sch->schid); | |
612 | if (rc < 0) { | |
613 | pr_warning("Logging for subchannel 0.%x.%04x failed with " | |
614 | "errno=%d\n", | |
615 | sch->schid.ssid, sch->schid.sch_no, rc); | |
616 | return rc; | |
617 | } | |
618 | pr_notice("Logging for subchannel 0.%x.%04x was triggered\n", | |
619 | sch->schid.ssid, sch->schid.sch_no); | |
620 | return count; | |
621 | } | |
622 | ||
1da177e4 LT |
623 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); |
624 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
625 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
626 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 627 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 628 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 | 629 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
fd0457a6 | 630 | static DEVICE_ATTR(logging, 0200, NULL, initiate_logging); |
1da177e4 | 631 | |
7e9db9ea | 632 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
633 | &dev_attr_chpids.attr, |
634 | &dev_attr_pimpampom.attr, | |
fd0457a6 | 635 | &dev_attr_logging.attr, |
1da177e4 LT |
636 | NULL, |
637 | }; | |
638 | ||
7e9db9ea CH |
639 | static struct attribute_group io_subchannel_attr_group = { |
640 | .attrs = io_subchannel_attrs, | |
529192f3 | 641 | }; |
1da177e4 LT |
642 | |
643 | static struct attribute * ccwdev_attrs[] = { | |
644 | &dev_attr_devtype.attr, | |
645 | &dev_attr_cutype.attr, | |
f1fc78a8 | 646 | &dev_attr_modalias.attr, |
1da177e4 LT |
647 | &dev_attr_online.attr, |
648 | &dev_attr_cmb_enable.attr, | |
649 | &dev_attr_availability.attr, | |
650 | NULL, | |
651 | }; | |
652 | ||
653 | static struct attribute_group ccwdev_attr_group = { | |
654 | .attrs = ccwdev_attrs, | |
655 | }; | |
656 | ||
a4dbd674 | 657 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
658 | &ccwdev_attr_group, |
659 | NULL, | |
660 | }; | |
1da177e4 LT |
661 | |
662 | /* this is a simple abstraction for device_register that sets the | |
663 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 664 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
665 | { |
666 | struct device *dev = &cdev->dev; | |
667 | int ret; | |
668 | ||
669 | dev->bus = &ccw_bus_type; | |
3ac276f8 SO |
670 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
671 | cdev->private->dev_id.devno); | |
672 | if (ret) | |
673 | return ret; | |
7d253b9a | 674 | return device_add(dev); |
1da177e4 LT |
675 | } |
676 | ||
5d6e6b6f | 677 | static int match_dev_id(struct device *dev, void *data) |
b0744bd2 | 678 | { |
5d6e6b6f PO |
679 | struct ccw_device *cdev = to_ccwdev(dev); |
680 | struct ccw_dev_id *dev_id = data; | |
d7b5a4c9 | 681 | |
d7b5a4c9 CH |
682 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); |
683 | } | |
684 | ||
5d6e6b6f | 685 | static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id) |
d7b5a4c9 CH |
686 | { |
687 | struct device *dev; | |
688 | ||
5d6e6b6f | 689 | dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id); |
d7b5a4c9 CH |
690 | |
691 | return dev ? to_ccwdev(dev) : NULL; | |
692 | } | |
693 | ||
37de53bb | 694 | static void ccw_device_do_unbind_bind(struct ccw_device *cdev) |
1da177e4 | 695 | { |
eb32ae8d | 696 | int ret; |
1da177e4 | 697 | |
7d253b9a | 698 | if (device_is_registered(&cdev->dev)) { |
eb32ae8d CH |
699 | device_release_driver(&cdev->dev); |
700 | ret = device_attach(&cdev->dev); | |
701 | WARN_ON(ret == -ENODEV); | |
702 | } | |
1da177e4 LT |
703 | } |
704 | ||
705 | static void | |
706 | ccw_device_release(struct device *dev) | |
707 | { | |
708 | struct ccw_device *cdev; | |
709 | ||
710 | cdev = to_ccwdev(dev); | |
6eff208f CH |
711 | /* Release reference of parent subchannel. */ |
712 | put_device(cdev->dev.parent); | |
1da177e4 LT |
713 | kfree(cdev->private); |
714 | kfree(cdev); | |
715 | } | |
716 | ||
7674da77 CH |
717 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
718 | { | |
719 | struct ccw_device *cdev; | |
720 | ||
721 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
722 | if (cdev) { | |
723 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
724 | GFP_KERNEL | GFP_DMA); | |
725 | if (cdev->private) | |
726 | return cdev; | |
727 | } | |
728 | kfree(cdev); | |
729 | return ERR_PTR(-ENOMEM); | |
730 | } | |
731 | ||
37de53bb PO |
732 | static void ccw_device_todo(struct work_struct *work); |
733 | ||
7674da77 CH |
734 | static int io_subchannel_initialize_dev(struct subchannel *sch, |
735 | struct ccw_device *cdev) | |
736 | { | |
737 | cdev->private->cdev = cdev; | |
738 | atomic_set(&cdev->private->onoff, 0); | |
739 | cdev->dev.parent = &sch->dev; | |
740 | cdev->dev.release = ccw_device_release; | |
37de53bb | 741 | INIT_WORK(&cdev->private->todo_work, ccw_device_todo); |
ef99516c | 742 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
743 | /* Do first half of device_register. */ |
744 | device_initialize(&cdev->dev); | |
745 | if (!get_device(&sch->dev)) { | |
283fdd0b CH |
746 | /* Release reference from device_initialize(). */ |
747 | put_device(&cdev->dev); | |
7674da77 CH |
748 | return -ENODEV; |
749 | } | |
24a1872d | 750 | cdev->private->flags.initialized = 1; |
7674da77 CH |
751 | return 0; |
752 | } | |
753 | ||
754 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
755 | { | |
756 | struct ccw_device *cdev; | |
757 | int ret; | |
758 | ||
759 | cdev = io_subchannel_allocate_dev(sch); | |
760 | if (!IS_ERR(cdev)) { | |
761 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 762 | if (ret) |
7674da77 | 763 | cdev = ERR_PTR(ret); |
7674da77 CH |
764 | } |
765 | return cdev; | |
766 | } | |
767 | ||
736b5db8 | 768 | static void io_subchannel_recog(struct ccw_device *, struct subchannel *); |
d7b5a4c9 | 769 | |
d7b5a4c9 CH |
770 | static void sch_create_and_recog_new_device(struct subchannel *sch) |
771 | { | |
772 | struct ccw_device *cdev; | |
773 | ||
774 | /* Need to allocate a new ccw device. */ | |
775 | cdev = io_subchannel_create_ccwdev(sch); | |
776 | if (IS_ERR(cdev)) { | |
777 | /* OK, we did everything we could... */ | |
778 | css_sch_device_unregister(sch); | |
779 | return; | |
780 | } | |
d7b5a4c9 | 781 | /* Start recognition for the new ccw device. */ |
736b5db8 | 782 | io_subchannel_recog(cdev, sch); |
d7b5a4c9 CH |
783 | } |
784 | ||
1da177e4 LT |
785 | /* |
786 | * Register recognized device. | |
787 | */ | |
37de53bb | 788 | static void io_subchannel_register(struct ccw_device *cdev) |
1da177e4 | 789 | { |
1da177e4 | 790 | struct subchannel *sch; |
a290156f | 791 | int ret, adjust_init_count = 1; |
1da177e4 LT |
792 | unsigned long flags; |
793 | ||
1da177e4 | 794 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
795 | /* |
796 | * Check if subchannel is still registered. It may have become | |
797 | * unregistered if a machine check hit us after finishing | |
798 | * device recognition but before the register work could be | |
799 | * queued. | |
800 | */ | |
801 | if (!device_is_registered(&sch->dev)) | |
802 | goto out_err; | |
82b7ac05 | 803 | css_update_ssd_info(sch); |
47af5518 CH |
804 | /* |
805 | * io_subchannel_register() will also be called after device | |
806 | * recognition has been done for a boxed device (which will already | |
807 | * be registered). We need to reprobe since we may now have sense id | |
808 | * information. | |
809 | */ | |
d6a30761 | 810 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
811 | if (!cdev->drv) { |
812 | ret = device_reprobe(&cdev->dev); | |
813 | if (ret) | |
814 | /* We can't do much here. */ | |
139b83dd | 815 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
816 | " %d for 0.%x.%04x\n", ret, |
817 | cdev->private->dev_id.ssid, | |
818 | cdev->private->dev_id.devno); | |
47af5518 | 819 | } |
a290156f | 820 | adjust_init_count = 0; |
1da177e4 LT |
821 | goto out; |
822 | } | |
fa1a8c23 CH |
823 | /* |
824 | * Now we know this subchannel will stay, we can throw | |
825 | * our delayed uevent. | |
826 | */ | |
f67f129e | 827 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 828 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 LT |
829 | /* make it known to the system */ |
830 | ret = ccw_device_register(cdev); | |
831 | if (ret) { | |
e556bbbd CH |
832 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
833 | cdev->private->dev_id.ssid, | |
834 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 835 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 836 | sch_set_cdev(sch, NULL); |
2ec22984 | 837 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
838 | /* Release initial device reference. */ |
839 | put_device(&cdev->dev); | |
5fb6b854 | 840 | goto out_err; |
1da177e4 | 841 | } |
1da177e4 LT |
842 | out: |
843 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 844 | wake_up(&cdev->private->wait_q); |
5fb6b854 | 845 | out_err: |
a290156f | 846 | if (adjust_init_count && atomic_dec_and_test(&ccw_device_init_count)) |
1da177e4 LT |
847 | wake_up(&ccw_device_init_wq); |
848 | } | |
849 | ||
37de53bb | 850 | static void ccw_device_call_sch_unregister(struct ccw_device *cdev) |
1da177e4 | 851 | { |
1da177e4 LT |
852 | struct subchannel *sch; |
853 | ||
46fbe4e4 PO |
854 | /* Get subchannel reference for local processing. */ |
855 | if (!get_device(cdev->dev.parent)) | |
856 | return; | |
1da177e4 | 857 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 858 | css_sch_device_unregister(sch); |
46fbe4e4 | 859 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
860 | put_device(&sch->dev); |
861 | } | |
862 | ||
863 | /* | |
864 | * subchannel recognition done. Called from the state machine. | |
865 | */ | |
866 | void | |
867 | io_subchannel_recog_done(struct ccw_device *cdev) | |
868 | { | |
1da177e4 LT |
869 | if (css_init_done == 0) { |
870 | cdev->private->flags.recog_done = 1; | |
871 | return; | |
872 | } | |
873 | switch (cdev->private->state) { | |
47593bfa SO |
874 | case DEV_STATE_BOXED: |
875 | /* Device did not respond in time. */ | |
1da177e4 LT |
876 | case DEV_STATE_NOT_OPER: |
877 | cdev->private->flags.recog_done = 1; | |
37de53bb PO |
878 | /* Remove device found not operational. */ |
879 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1da177e4 LT |
880 | if (atomic_dec_and_test(&ccw_device_init_count)) |
881 | wake_up(&ccw_device_init_wq); | |
882 | break; | |
1da177e4 LT |
883 | case DEV_STATE_OFFLINE: |
884 | /* | |
885 | * We can't register the device in interrupt context so | |
886 | * we schedule a work item. | |
887 | */ | |
37de53bb | 888 | ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER); |
1da177e4 LT |
889 | break; |
890 | } | |
891 | } | |
892 | ||
736b5db8 | 893 | static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) |
1da177e4 | 894 | { |
1da177e4 LT |
895 | struct ccw_device_private *priv; |
896 | ||
2ec22984 | 897 | cdev->ccwlock = sch->lock; |
fb6958a5 | 898 | |
1da177e4 LT |
899 | /* Init private data. */ |
900 | priv = cdev->private; | |
78964268 CH |
901 | priv->dev_id.devno = sch->schib.pmcw.dev; |
902 | priv->dev_id.ssid = sch->schid.ssid; | |
903 | priv->schid = sch->schid; | |
1da177e4 LT |
904 | priv->state = DEV_STATE_NOT_OPER; |
905 | INIT_LIST_HEAD(&priv->cmb_list); | |
906 | init_waitqueue_head(&priv->wait_q); | |
907 | init_timer(&priv->timer); | |
908 | ||
1da177e4 LT |
909 | /* Increase counter of devices currently in recognition. */ |
910 | atomic_inc(&ccw_device_init_count); | |
911 | ||
912 | /* Start async. device sensing. */ | |
2ec22984 | 913 | spin_lock_irq(sch->lock); |
60e4dac1 | 914 | sch_set_cdev(sch, cdev); |
736b5db8 | 915 | ccw_device_recognition(cdev); |
2ec22984 | 916 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
917 | } |
918 | ||
5d6e6b6f PO |
919 | static int ccw_device_move_to_sch(struct ccw_device *cdev, |
920 | struct subchannel *sch) | |
d7b5a4c9 | 921 | { |
5d6e6b6f | 922 | struct subchannel *old_sch; |
0c609fca | 923 | int rc, old_enabled = 0; |
d7b5a4c9 | 924 | |
5d6e6b6f PO |
925 | old_sch = to_subchannel(cdev->dev.parent); |
926 | /* Obtain child reference for new parent. */ | |
6eff208f | 927 | if (!get_device(&sch->dev)) |
5d6e6b6f | 928 | return -ENODEV; |
0c609fca SO |
929 | |
930 | if (!sch_is_pseudo_sch(old_sch)) { | |
931 | spin_lock_irq(old_sch->lock); | |
932 | old_enabled = old_sch->schib.pmcw.ena; | |
933 | rc = 0; | |
934 | if (old_enabled) | |
935 | rc = cio_disable_subchannel(old_sch); | |
936 | spin_unlock_irq(old_sch->lock); | |
937 | if (rc == -EBUSY) { | |
938 | /* Release child reference for new parent. */ | |
939 | put_device(&sch->dev); | |
940 | return rc; | |
941 | } | |
942 | } | |
943 | ||
d7b5a4c9 | 944 | mutex_lock(&sch->reg_mutex); |
ffa6a705 | 945 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
946 | mutex_unlock(&sch->reg_mutex); |
947 | if (rc) { | |
5d6e6b6f | 948 | CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", |
d7b5a4c9 CH |
949 | cdev->private->dev_id.ssid, |
950 | cdev->private->dev_id.devno, sch->schid.ssid, | |
5d6e6b6f | 951 | sch->schib.pmcw.dev, rc); |
0c609fca SO |
952 | if (old_enabled) { |
953 | /* Try to reenable the old subchannel. */ | |
954 | spin_lock_irq(old_sch->lock); | |
955 | cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch); | |
956 | spin_unlock_irq(old_sch->lock); | |
957 | } | |
5d6e6b6f | 958 | /* Release child reference for new parent. */ |
6eff208f | 959 | put_device(&sch->dev); |
5d6e6b6f | 960 | return rc; |
d7b5a4c9 | 961 | } |
5d6e6b6f PO |
962 | /* Clean up old subchannel. */ |
963 | if (!sch_is_pseudo_sch(old_sch)) { | |
964 | spin_lock_irq(old_sch->lock); | |
965 | sch_set_cdev(old_sch, NULL); | |
5d6e6b6f PO |
966 | spin_unlock_irq(old_sch->lock); |
967 | css_schedule_eval(old_sch->schid); | |
d7b5a4c9 | 968 | } |
5d6e6b6f PO |
969 | /* Release child reference for old parent. */ |
970 | put_device(&old_sch->dev); | |
971 | /* Initialize new subchannel. */ | |
972 | spin_lock_irq(sch->lock); | |
973 | cdev->private->schid = sch->schid; | |
974 | cdev->ccwlock = sch->lock; | |
975 | if (!sch_is_pseudo_sch(sch)) | |
976 | sch_set_cdev(sch, cdev); | |
977 | spin_unlock_irq(sch->lock); | |
978 | if (!sch_is_pseudo_sch(sch)) | |
979 | css_update_ssd_info(sch); | |
980 | return 0; | |
981 | } | |
982 | ||
983 | static int ccw_device_move_to_orph(struct ccw_device *cdev) | |
984 | { | |
985 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
986 | struct channel_subsystem *css = to_css(sch->dev.parent); | |
987 | ||
988 | return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); | |
d7b5a4c9 CH |
989 | } |
990 | ||
602b20f2 CH |
991 | static void io_subchannel_irq(struct subchannel *sch) |
992 | { | |
993 | struct ccw_device *cdev; | |
994 | ||
db6a6423 | 995 | cdev = sch_get_cdev(sch); |
602b20f2 | 996 | |
efd986db SO |
997 | CIO_TRACE_EVENT(6, "IRQ"); |
998 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
999 | if (cdev) |
1000 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
1001 | } | |
1002 | ||
13952ec1 SO |
1003 | void io_subchannel_init_config(struct subchannel *sch) |
1004 | { | |
1005 | memset(&sch->config, 0, sizeof(sch->config)); | |
1006 | sch->config.csense = 1; | |
13952ec1 SO |
1007 | } |
1008 | ||
0ae7a7b2 CH |
1009 | static void io_subchannel_init_fields(struct subchannel *sch) |
1010 | { | |
1011 | if (cio_is_console(sch->schid)) | |
1012 | sch->opm = 0xff; | |
1013 | else | |
1014 | sch->opm = chp_get_sch_opm(sch); | |
1015 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1016 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1017 | |
1018 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1019 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1020 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1021 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1022 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
1023 | |
1024 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1025 | } |
1026 | ||
90ed2b69 CH |
1027 | /* |
1028 | * Note: We always return 0 so that we bind to the device even on error. | |
1029 | * This is needed so that our remove function is called on unregister. | |
1030 | */ | |
0ae7a7b2 | 1031 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1032 | { |
1da177e4 LT |
1033 | struct ccw_device *cdev; |
1034 | int rc; | |
1da177e4 | 1035 | |
6d7c5afc | 1036 | if (cio_is_console(sch->schid)) { |
7e9db9ea CH |
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); | |
1da177e4 | 1044 | /* |
6d7c5afc | 1045 | * The console subchannel already has an associated ccw_device. |
7e9db9ea | 1046 | * Throw the delayed uevent for the subchannel, register |
6d7c5afc | 1047 | * the ccw_device and exit. |
1da177e4 | 1048 | */ |
f67f129e | 1049 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1050 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
6d7c5afc | 1051 | cdev = sch_get_cdev(sch); |
e1031786 | 1052 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 | 1053 | device_initialize(&cdev->dev); |
24a1872d | 1054 | cdev->private->flags.initialized = 1; |
1da177e4 | 1055 | ccw_device_register(cdev); |
1da177e4 LT |
1056 | /* |
1057 | * Check if the device is already online. If it is | |
9cd67421 CH |
1058 | * the reference count needs to be corrected since we |
1059 | * didn't obtain a reference in ccw_device_set_online. | |
1da177e4 LT |
1060 | */ |
1061 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1062 | cdev->private->state != DEV_STATE_OFFLINE && | |
1063 | cdev->private->state != DEV_STATE_BOXED) | |
1064 | get_device(&cdev->dev); | |
1065 | return 0; | |
1066 | } | |
0ae7a7b2 | 1067 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1068 | rc = cio_commit_config(sch); |
1069 | if (rc) | |
1070 | goto out_schedule; | |
7e9db9ea CH |
1071 | rc = sysfs_create_group(&sch->dev.kobj, |
1072 | &io_subchannel_attr_group); | |
1073 | if (rc) | |
90ed2b69 | 1074 | goto out_schedule; |
cd6b4f27 CH |
1075 | /* Allocate I/O subchannel private data. */ |
1076 | sch->private = kzalloc(sizeof(struct io_subchannel_private), | |
1077 | GFP_KERNEL | GFP_DMA); | |
90ed2b69 | 1078 | if (!sch->private) |
48e4c385 | 1079 | goto out_schedule; |
5d6e6b6f | 1080 | css_schedule_eval(sch->schid); |
7e9db9ea | 1081 | return 0; |
48e4c385 | 1082 | |
90ed2b69 | 1083 | out_schedule: |
390935ac PO |
1084 | spin_lock_irq(sch->lock); |
1085 | css_sched_sch_todo(sch, SCH_TODO_UNREG); | |
1086 | spin_unlock_irq(sch->lock); | |
90ed2b69 | 1087 | return 0; |
1da177e4 LT |
1088 | } |
1089 | ||
1da177e4 | 1090 | static int |
8bbace7e | 1091 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1092 | { |
1093 | struct ccw_device *cdev; | |
1da177e4 | 1094 | |
db6a6423 CH |
1095 | cdev = sch_get_cdev(sch); |
1096 | if (!cdev) | |
48e4c385 | 1097 | goto out_free; |
6e9a0f67 | 1098 | io_subchannel_quiesce(sch); |
1da177e4 | 1099 | /* Set ccw device to not operational and drop reference. */ |
7a8ad100 | 1100 | spin_lock_irq(cdev->ccwlock); |
db6a6423 | 1101 | sch_set_cdev(sch, NULL); |
1da177e4 | 1102 | cdev->private->state = DEV_STATE_NOT_OPER; |
7a8ad100 | 1103 | spin_unlock_irq(cdev->ccwlock); |
ef99516c | 1104 | ccw_device_unregister(cdev); |
48e4c385 | 1105 | out_free: |
cd6b4f27 | 1106 | kfree(sch->private); |
7e9db9ea | 1107 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1108 | return 0; |
1109 | } | |
1110 | ||
602b20f2 | 1111 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1112 | { |
1113 | struct ccw_device *cdev; | |
1114 | ||
db6a6423 | 1115 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1116 | if (cdev) |
1117 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1118 | } | |
1119 | ||
c820de39 CH |
1120 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1121 | { | |
1122 | struct ccw_device *cdev; | |
1123 | ||
1124 | cdev = sch_get_cdev(sch); | |
1125 | if (!cdev) | |
1126 | return; | |
4257aaec PO |
1127 | if (cio_update_schib(sch)) |
1128 | goto err; | |
1129 | /* Check for I/O on path. */ | |
1130 | if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask) | |
1131 | goto out; | |
1132 | if (cdev->private->state == DEV_STATE_ONLINE) { | |
1133 | ccw_device_kill_io(cdev); | |
1134 | goto out; | |
1135 | } | |
1136 | if (cio_clear(sch)) | |
1137 | goto err; | |
1138 | out: | |
1139 | /* Trigger path verification. */ | |
1140 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1141 | return; | |
c820de39 | 1142 | |
4257aaec PO |
1143 | err: |
1144 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
c820de39 CH |
1145 | } |
1146 | ||
99611f87 CH |
1147 | static int io_subchannel_chp_event(struct subchannel *sch, |
1148 | struct chp_link *link, int event) | |
c820de39 CH |
1149 | { |
1150 | int mask; | |
c820de39 | 1151 | |
99611f87 | 1152 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1153 | if (!mask) |
1154 | return 0; | |
1155 | switch (event) { | |
1156 | case CHP_VARY_OFF: | |
1157 | sch->opm &= ~mask; | |
1158 | sch->lpm &= ~mask; | |
1159 | io_subchannel_terminate_path(sch, mask); | |
1160 | break; | |
1161 | case CHP_VARY_ON: | |
1162 | sch->opm |= mask; | |
1163 | sch->lpm |= mask; | |
1164 | io_subchannel_verify(sch); | |
1165 | break; | |
1166 | case CHP_OFFLINE: | |
cdb912a4 | 1167 | if (cio_update_schib(sch)) |
c820de39 CH |
1168 | return -ENODEV; |
1169 | io_subchannel_terminate_path(sch, mask); | |
1170 | break; | |
1171 | case CHP_ONLINE: | |
cdb912a4 SO |
1172 | if (cio_update_schib(sch)) |
1173 | return -ENODEV; | |
c820de39 CH |
1174 | sch->lpm |= mask & sch->opm; |
1175 | io_subchannel_verify(sch); | |
1176 | break; | |
1177 | } | |
1178 | return 0; | |
1179 | } | |
1180 | ||
6e9a0f67 | 1181 | static void io_subchannel_quiesce(struct subchannel *sch) |
1da177e4 | 1182 | { |
1da177e4 LT |
1183 | struct ccw_device *cdev; |
1184 | int ret; | |
1185 | ||
56e6b796 | 1186 | spin_lock_irq(sch->lock); |
db6a6423 | 1187 | cdev = sch_get_cdev(sch); |
a8237fc4 | 1188 | if (cio_is_console(sch->schid)) |
56e6b796 | 1189 | goto out_unlock; |
1da177e4 | 1190 | if (!sch->schib.pmcw.ena) |
56e6b796 | 1191 | goto out_unlock; |
1da177e4 LT |
1192 | ret = cio_disable_subchannel(sch); |
1193 | if (ret != -EBUSY) | |
56e6b796 | 1194 | goto out_unlock; |
1da177e4 | 1195 | if (cdev->handler) |
56e6b796 SO |
1196 | cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO)); |
1197 | while (ret == -EBUSY) { | |
1198 | cdev->private->state = DEV_STATE_QUIESCE; | |
1199 | ret = ccw_device_cancel_halt_clear(cdev); | |
1200 | if (ret == -EBUSY) { | |
1201 | ccw_device_set_timeout(cdev, HZ/10); | |
1202 | spin_unlock_irq(sch->lock); | |
1203 | wait_event(cdev->private->wait_q, | |
1204 | cdev->private->state != DEV_STATE_QUIESCE); | |
1205 | spin_lock_irq(sch->lock); | |
1206 | } | |
1207 | ret = cio_disable_subchannel(sch); | |
1da177e4 | 1208 | } |
56e6b796 SO |
1209 | out_unlock: |
1210 | spin_unlock_irq(sch->lock); | |
1da177e4 LT |
1211 | } |
1212 | ||
6e9a0f67 SO |
1213 | static void io_subchannel_shutdown(struct subchannel *sch) |
1214 | { | |
1215 | io_subchannel_quiesce(sch); | |
1216 | } | |
1217 | ||
c820de39 CH |
1218 | static int device_is_disconnected(struct ccw_device *cdev) |
1219 | { | |
1220 | if (!cdev) | |
1221 | return 0; | |
1222 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1223 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1224 | } | |
1225 | ||
1226 | static int recovery_check(struct device *dev, void *data) | |
1227 | { | |
1228 | struct ccw_device *cdev = to_ccwdev(dev); | |
1229 | int *redo = data; | |
1230 | ||
1231 | spin_lock_irq(cdev->ccwlock); | |
1232 | switch (cdev->private->state) { | |
1233 | case DEV_STATE_DISCONNECTED: | |
1234 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1235 | cdev->private->dev_id.ssid, | |
1236 | cdev->private->dev_id.devno); | |
1237 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1238 | *redo = 1; | |
1239 | break; | |
1240 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1241 | *redo = 1; | |
1242 | break; | |
1243 | } | |
1244 | spin_unlock_irq(cdev->ccwlock); | |
1245 | ||
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | static void recovery_work_func(struct work_struct *unused) | |
1250 | { | |
1251 | int redo = 0; | |
1252 | ||
1253 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1254 | if (redo) { | |
1255 | spin_lock_irq(&recovery_lock); | |
1256 | if (!timer_pending(&recovery_timer)) { | |
1257 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1258 | recovery_phase++; | |
1259 | mod_timer(&recovery_timer, jiffies + | |
1260 | recovery_delay[recovery_phase] * HZ); | |
1261 | } | |
1262 | spin_unlock_irq(&recovery_lock); | |
1263 | } else | |
1264 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1265 | } | |
1266 | ||
1267 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1268 | ||
1269 | static void recovery_func(unsigned long data) | |
1270 | { | |
1271 | /* | |
1272 | * We can't do our recovery in softirq context and it's not | |
1273 | * performance critical, so we schedule it. | |
1274 | */ | |
1275 | schedule_work(&recovery_work); | |
1276 | } | |
1277 | ||
1278 | static void ccw_device_schedule_recovery(void) | |
1279 | { | |
1280 | unsigned long flags; | |
1281 | ||
1282 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1283 | spin_lock_irqsave(&recovery_lock, flags); | |
1284 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1285 | recovery_phase = 0; | |
1286 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1287 | } | |
1288 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1289 | } | |
1290 | ||
ecf5d9ef PO |
1291 | static int purge_fn(struct device *dev, void *data) |
1292 | { | |
1293 | struct ccw_device *cdev = to_ccwdev(dev); | |
37de53bb | 1294 | struct ccw_dev_id *id = &cdev->private->dev_id; |
ecf5d9ef PO |
1295 | |
1296 | spin_lock_irq(cdev->ccwlock); | |
37de53bb PO |
1297 | if (is_blacklisted(id->ssid, id->devno) && |
1298 | (cdev->private->state == DEV_STATE_OFFLINE)) { | |
1299 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid, | |
1300 | id->devno); | |
1301 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1302 | } | |
ecf5d9ef | 1303 | spin_unlock_irq(cdev->ccwlock); |
ecf5d9ef PO |
1304 | /* Abort loop in case of pending signal. */ |
1305 | if (signal_pending(current)) | |
1306 | return -EINTR; | |
1307 | ||
1308 | return 0; | |
1309 | } | |
1310 | ||
1311 | /** | |
1312 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1313 | * | |
1314 | * Unregister all ccw devices that are offline and on the blacklist. | |
1315 | */ | |
1316 | int ccw_purge_blacklisted(void) | |
1317 | { | |
1318 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1319 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1320 | return 0; | |
1321 | } | |
1322 | ||
6afcc775 | 1323 | void ccw_device_set_disconnected(struct ccw_device *cdev) |
c820de39 CH |
1324 | { |
1325 | if (!cdev) | |
1326 | return; | |
1327 | ccw_device_set_timeout(cdev, 0); | |
1328 | cdev->private->flags.fake_irb = 0; | |
1329 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1330 | if (cdev->online) | |
1331 | ccw_device_schedule_recovery(); | |
1332 | } | |
1333 | ||
91c36919 PO |
1334 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1335 | { | |
1336 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1337 | ||
1338 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1339 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1340 | ccw_device_set_timeout(cdev, 0); |
1341 | cio_disable_subchannel(sch); | |
1342 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1343 | } | |
1344 | ||
5d6e6b6f PO |
1345 | enum io_sch_action { |
1346 | IO_SCH_UNREG, | |
1347 | IO_SCH_ORPH_UNREG, | |
1348 | IO_SCH_ATTACH, | |
1349 | IO_SCH_UNREG_ATTACH, | |
1350 | IO_SCH_ORPH_ATTACH, | |
1351 | IO_SCH_REPROBE, | |
1352 | IO_SCH_VERIFY, | |
1353 | IO_SCH_DISC, | |
1354 | IO_SCH_NOP, | |
1355 | }; | |
1356 | ||
1357 | static enum io_sch_action sch_get_action(struct subchannel *sch) | |
1358 | { | |
1359 | struct ccw_device *cdev; | |
1360 | ||
1361 | cdev = sch_get_cdev(sch); | |
1362 | if (cio_update_schib(sch)) { | |
1363 | /* Not operational. */ | |
1364 | if (!cdev) | |
1365 | return IO_SCH_UNREG; | |
76e6fb4b | 1366 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1367 | return IO_SCH_UNREG; |
1368 | return IO_SCH_ORPH_UNREG; | |
1369 | } | |
1370 | /* Operational. */ | |
1371 | if (!cdev) | |
1372 | return IO_SCH_ATTACH; | |
1373 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
76e6fb4b | 1374 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1375 | return IO_SCH_UNREG_ATTACH; |
1376 | return IO_SCH_ORPH_ATTACH; | |
1377 | } | |
1378 | if ((sch->schib.pmcw.pam & sch->opm) == 0) { | |
76e6fb4b | 1379 | if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) |
5d6e6b6f PO |
1380 | return IO_SCH_UNREG; |
1381 | return IO_SCH_DISC; | |
1382 | } | |
1383 | if (device_is_disconnected(cdev)) | |
1384 | return IO_SCH_REPROBE; | |
1385 | if (cdev->online) | |
1386 | return IO_SCH_VERIFY; | |
1387 | return IO_SCH_NOP; | |
1388 | } | |
1389 | ||
1390 | /** | |
1391 | * io_subchannel_sch_event - process subchannel event | |
1392 | * @sch: subchannel | |
1393 | * @process: non-zero if function is called in process context | |
1394 | * | |
1395 | * An unspecified event occurred for this subchannel. Adjust data according | |
1396 | * to the current operational state of the subchannel and device. Return | |
1397 | * zero when the event has been handled sufficiently or -EAGAIN when this | |
1398 | * function should be called again in process context. | |
1399 | */ | |
1400 | static int io_subchannel_sch_event(struct subchannel *sch, int process) | |
c820de39 | 1401 | { |
c820de39 | 1402 | unsigned long flags; |
c820de39 | 1403 | struct ccw_device *cdev; |
5d6e6b6f PO |
1404 | struct ccw_dev_id dev_id; |
1405 | enum io_sch_action action; | |
1406 | int rc = -EAGAIN; | |
c820de39 CH |
1407 | |
1408 | spin_lock_irqsave(sch->lock, flags); | |
5d6e6b6f PO |
1409 | if (!device_is_registered(&sch->dev)) |
1410 | goto out_unlock; | |
390935ac PO |
1411 | if (work_pending(&sch->todo_work)) |
1412 | goto out_unlock; | |
37de53bb PO |
1413 | cdev = sch_get_cdev(sch); |
1414 | if (cdev && work_pending(&cdev->private->todo_work)) | |
1415 | goto out_unlock; | |
5d6e6b6f PO |
1416 | action = sch_get_action(sch); |
1417 | CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", | |
1418 | sch->schid.ssid, sch->schid.sch_no, process, | |
1419 | action); | |
1420 | /* Perform immediate actions while holding the lock. */ | |
5d6e6b6f PO |
1421 | switch (action) { |
1422 | case IO_SCH_REPROBE: | |
1423 | /* Trigger device recognition. */ | |
1424 | ccw_device_trigger_reprobe(cdev); | |
1425 | rc = 0; | |
1426 | goto out_unlock; | |
1427 | case IO_SCH_VERIFY: | |
0d01bb89 SO |
1428 | if (cdev->private->flags.resuming == 1) { |
1429 | if (cio_enable_subchannel(sch, (u32)(addr_t)sch)) { | |
1430 | ccw_device_set_notoper(cdev); | |
1431 | break; | |
1432 | } | |
1433 | } | |
5d6e6b6f PO |
1434 | /* Trigger path verification. */ |
1435 | io_subchannel_verify(sch); | |
1436 | rc = 0; | |
1437 | goto out_unlock; | |
1438 | case IO_SCH_DISC: | |
1439 | ccw_device_set_disconnected(cdev); | |
1440 | rc = 0; | |
1441 | goto out_unlock; | |
1442 | case IO_SCH_ORPH_UNREG: | |
1443 | case IO_SCH_ORPH_ATTACH: | |
1444 | ccw_device_set_disconnected(cdev); | |
1445 | break; | |
1446 | case IO_SCH_UNREG_ATTACH: | |
1447 | case IO_SCH_UNREG: | |
1448 | if (cdev) | |
1449 | ccw_device_set_notoper(cdev); | |
1450 | break; | |
1451 | case IO_SCH_NOP: | |
1452 | rc = 0; | |
1453 | goto out_unlock; | |
1454 | default: | |
1455 | break; | |
c820de39 | 1456 | } |
5d6e6b6f PO |
1457 | spin_unlock_irqrestore(sch->lock, flags); |
1458 | /* All other actions require process context. */ | |
1459 | if (!process) | |
1460 | goto out; | |
1461 | /* Handle attached ccw device. */ | |
1462 | switch (action) { | |
1463 | case IO_SCH_ORPH_UNREG: | |
1464 | case IO_SCH_ORPH_ATTACH: | |
1465 | /* Move ccw device to orphanage. */ | |
1466 | rc = ccw_device_move_to_orph(cdev); | |
1467 | if (rc) | |
1468 | goto out; | |
c820de39 | 1469 | break; |
5d6e6b6f | 1470 | case IO_SCH_UNREG_ATTACH: |
74b6127e SO |
1471 | if (cdev->private->flags.resuming) { |
1472 | /* Device will be handled later. */ | |
1473 | rc = 0; | |
1474 | goto out; | |
1475 | } | |
5d6e6b6f | 1476 | /* Unregister ccw device. */ |
74b6127e | 1477 | ccw_device_unregister(cdev); |
c820de39 | 1478 | break; |
5d6e6b6f | 1479 | default: |
c820de39 CH |
1480 | break; |
1481 | } | |
5d6e6b6f | 1482 | /* Handle subchannel. */ |
c820de39 | 1483 | switch (action) { |
5d6e6b6f PO |
1484 | case IO_SCH_ORPH_UNREG: |
1485 | case IO_SCH_UNREG: | |
0d01bb89 SO |
1486 | if (!cdev || !cdev->private->flags.resuming) |
1487 | css_sch_device_unregister(sch); | |
c820de39 | 1488 | break; |
5d6e6b6f PO |
1489 | case IO_SCH_ORPH_ATTACH: |
1490 | case IO_SCH_UNREG_ATTACH: | |
1491 | case IO_SCH_ATTACH: | |
1492 | dev_id.ssid = sch->schid.ssid; | |
1493 | dev_id.devno = sch->schib.pmcw.dev; | |
1494 | cdev = get_ccwdev_by_dev_id(&dev_id); | |
1495 | if (!cdev) { | |
1496 | sch_create_and_recog_new_device(sch); | |
1497 | break; | |
1498 | } | |
1499 | rc = ccw_device_move_to_sch(cdev, sch); | |
1500 | if (rc) { | |
1501 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1502 | put_device(&cdev->dev); | |
1503 | goto out; | |
1504 | } | |
1505 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 | 1506 | ccw_device_trigger_reprobe(cdev); |
5d6e6b6f PO |
1507 | spin_unlock_irqrestore(sch->lock, flags); |
1508 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1509 | put_device(&cdev->dev); | |
91c36919 | 1510 | break; |
c820de39 CH |
1511 | default: |
1512 | break; | |
1513 | } | |
5d6e6b6f | 1514 | return 0; |
c820de39 | 1515 | |
5d6e6b6f PO |
1516 | out_unlock: |
1517 | spin_unlock_irqrestore(sch->lock, flags); | |
1518 | out: | |
1519 | return rc; | |
c820de39 CH |
1520 | } |
1521 | ||
1da177e4 LT |
1522 | #ifdef CONFIG_CCW_CONSOLE |
1523 | static struct ccw_device console_cdev; | |
1524 | static struct ccw_device_private console_private; | |
1525 | static int console_cdev_in_use; | |
1526 | ||
2ec22984 CH |
1527 | static DEFINE_SPINLOCK(ccw_console_lock); |
1528 | ||
1529 | spinlock_t * cio_get_console_lock(void) | |
1530 | { | |
1531 | return &ccw_console_lock; | |
1532 | } | |
1533 | ||
0ae7a7b2 CH |
1534 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1535 | struct subchannel *sch) | |
1da177e4 LT |
1536 | { |
1537 | int rc; | |
1538 | ||
cd6b4f27 CH |
1539 | /* Attach subchannel private data. */ |
1540 | sch->private = cio_get_console_priv(); | |
1541 | memset(sch->private, 0, sizeof(struct io_subchannel_private)); | |
0ae7a7b2 | 1542 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1543 | rc = cio_commit_config(sch); |
1544 | if (rc) | |
1545 | return rc; | |
0ae7a7b2 | 1546 | sch->driver = &io_subchannel_driver; |
1da177e4 | 1547 | /* Initialize the ccw_device structure. */ |
292888c8 | 1548 | cdev->dev.parent= &sch->dev; |
ffa8d2a3 | 1549 | sch_set_cdev(sch, cdev); |
736b5db8 | 1550 | io_subchannel_recog(cdev, sch); |
1da177e4 LT |
1551 | /* Now wait for the async. recognition to come to an end. */ |
1552 | spin_lock_irq(cdev->ccwlock); | |
1553 | while (!dev_fsm_final_state(cdev)) | |
1554 | wait_cons_dev(); | |
1555 | rc = -EIO; | |
1556 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1557 | goto out_unlock; | |
1558 | ccw_device_online(cdev); | |
1559 | while (!dev_fsm_final_state(cdev)) | |
1560 | wait_cons_dev(); | |
1561 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1562 | goto out_unlock; | |
1563 | rc = 0; | |
1564 | out_unlock: | |
1565 | spin_unlock_irq(cdev->ccwlock); | |
736b5db8 | 1566 | return rc; |
1da177e4 LT |
1567 | } |
1568 | ||
1569 | struct ccw_device * | |
1570 | ccw_device_probe_console(void) | |
1571 | { | |
1572 | struct subchannel *sch; | |
1573 | int ret; | |
1574 | ||
1575 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1576 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1577 | sch = cio_probe_console(); |
1578 | if (IS_ERR(sch)) { | |
1579 | console_cdev_in_use = 0; | |
1580 | return (void *) sch; | |
1581 | } | |
1582 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1583 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1584 | console_cdev.private = &console_private; | |
c1637532 | 1585 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1586 | ret = ccw_device_console_enable(&console_cdev, sch); |
1587 | if (ret) { | |
1588 | cio_release_console(); | |
1589 | console_cdev_in_use = 0; | |
1590 | return ERR_PTR(ret); | |
1591 | } | |
1592 | console_cdev.online = 1; | |
1593 | return &console_cdev; | |
1594 | } | |
1f4e7eda | 1595 | |
6664845c MS |
1596 | static int ccw_device_pm_restore(struct device *dev); |
1597 | ||
1598 | int ccw_device_force_console(void) | |
1599 | { | |
1600 | if (!console_cdev_in_use) | |
1601 | return -ENODEV; | |
1602 | return ccw_device_pm_restore(&console_cdev.dev); | |
1603 | } | |
1604 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1605 | #endif |
1606 | ||
1607 | /* | |
1608 | * get ccw_device matching the busid, but only if owned by cdrv | |
1609 | */ | |
b0744bd2 CH |
1610 | static int |
1611 | __ccwdev_check_busid(struct device *dev, void *id) | |
1612 | { | |
1613 | char *bus_id; | |
1614 | ||
12975aef | 1615 | bus_id = id; |
b0744bd2 | 1616 | |
98df67b3 | 1617 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1618 | } |
1619 | ||
1620 | ||
b2ffd8e9 CH |
1621 | /** |
1622 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1623 | * @cdrv: driver the device is owned by | |
1624 | * @bus_id: bus id of the device to be searched | |
1625 | * | |
1626 | * This function searches all devices owned by @cdrv for a device with a bus | |
1627 | * id matching @bus_id. | |
1628 | * Returns: | |
1629 | * If a match is found, its reference count of the found device is increased | |
1630 | * and it is returned; else %NULL is returned. | |
1631 | */ | |
1632 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1633 | const char *bus_id) | |
1da177e4 | 1634 | { |
b0744bd2 | 1635 | struct device *dev; |
1da177e4 LT |
1636 | struct device_driver *drv; |
1637 | ||
1638 | drv = get_driver(&cdrv->driver); | |
1639 | if (!drv) | |
b0744bd2 | 1640 | return NULL; |
1da177e4 | 1641 | |
b0744bd2 CH |
1642 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1643 | __ccwdev_check_busid); | |
1da177e4 LT |
1644 | put_driver(drv); |
1645 | ||
d2c993d8 | 1646 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1647 | } |
1648 | ||
1649 | /************************** device driver handling ************************/ | |
1650 | ||
1651 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1652 | * and release methods are initially very similar to the device_driver | |
1653 | * implementations, with the difference that they have ccw_device | |
1654 | * arguments. | |
1655 | * | |
1656 | * A ccw driver also contains the information that is needed for | |
1657 | * device matching. | |
1658 | */ | |
1659 | static int | |
1660 | ccw_device_probe (struct device *dev) | |
1661 | { | |
1662 | struct ccw_device *cdev = to_ccwdev(dev); | |
1663 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1664 | int ret; | |
1665 | ||
1666 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1667 | ||
1668 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1669 | ||
1670 | if (ret) { | |
d2c993d8 | 1671 | cdev->drv = NULL; |
1da177e4 LT |
1672 | return ret; |
1673 | } | |
1674 | ||
1675 | return 0; | |
1676 | } | |
1677 | ||
1678 | static int | |
1679 | ccw_device_remove (struct device *dev) | |
1680 | { | |
1681 | struct ccw_device *cdev = to_ccwdev(dev); | |
1682 | struct ccw_driver *cdrv = cdev->drv; | |
1683 | int ret; | |
1684 | ||
1da177e4 LT |
1685 | if (cdrv->remove) |
1686 | cdrv->remove(cdev); | |
1687 | if (cdev->online) { | |
1688 | cdev->online = 0; | |
1689 | spin_lock_irq(cdev->ccwlock); | |
1690 | ret = ccw_device_offline(cdev); | |
1691 | spin_unlock_irq(cdev->ccwlock); | |
1692 | if (ret == 0) | |
1693 | wait_event(cdev->private->wait_q, | |
1694 | dev_fsm_final_state(cdev)); | |
1695 | else | |
139b83dd | 1696 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1697 | "device 0.%x.%04x\n", |
1698 | ret, cdev->private->dev_id.ssid, | |
1699 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1700 | /* Give up reference obtained in ccw_device_set_online(). */ |
1701 | put_device(&cdev->dev); | |
1da177e4 LT |
1702 | } |
1703 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1704 | cdev->drv = NULL; |
1da177e4 LT |
1705 | return 0; |
1706 | } | |
1707 | ||
958974fb CH |
1708 | static void ccw_device_shutdown(struct device *dev) |
1709 | { | |
1710 | struct ccw_device *cdev; | |
1711 | ||
1712 | cdev = to_ccwdev(dev); | |
1713 | if (cdev->drv && cdev->drv->shutdown) | |
1714 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1715 | disable_cmf(cdev); |
958974fb CH |
1716 | } |
1717 | ||
823d494a SO |
1718 | static int ccw_device_pm_prepare(struct device *dev) |
1719 | { | |
1720 | struct ccw_device *cdev = to_ccwdev(dev); | |
1721 | ||
37de53bb | 1722 | if (work_pending(&cdev->private->todo_work)) |
823d494a SO |
1723 | return -EAGAIN; |
1724 | /* Fail while device is being set online/offline. */ | |
1725 | if (atomic_read(&cdev->private->onoff)) | |
1726 | return -EAGAIN; | |
1727 | ||
1728 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1729 | return cdev->drv->prepare(cdev); | |
1730 | ||
1731 | return 0; | |
1732 | } | |
1733 | ||
1734 | static void ccw_device_pm_complete(struct device *dev) | |
1735 | { | |
1736 | struct ccw_device *cdev = to_ccwdev(dev); | |
1737 | ||
1738 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1739 | cdev->drv->complete(cdev); | |
1740 | } | |
1741 | ||
1742 | static int ccw_device_pm_freeze(struct device *dev) | |
1743 | { | |
1744 | struct ccw_device *cdev = to_ccwdev(dev); | |
1745 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1746 | int ret, cm_enabled; | |
1747 | ||
1748 | /* Fail suspend while device is in transistional state. */ | |
1749 | if (!dev_fsm_final_state(cdev)) | |
1750 | return -EAGAIN; | |
1751 | if (!cdev->online) | |
1752 | return 0; | |
1753 | if (cdev->drv && cdev->drv->freeze) { | |
1754 | ret = cdev->drv->freeze(cdev); | |
1755 | if (ret) | |
1756 | return ret; | |
1757 | } | |
1758 | ||
1759 | spin_lock_irq(sch->lock); | |
1760 | cm_enabled = cdev->private->cmb != NULL; | |
1761 | spin_unlock_irq(sch->lock); | |
1762 | if (cm_enabled) { | |
1763 | /* Don't have the css write on memory. */ | |
1764 | ret = ccw_set_cmf(cdev, 0); | |
1765 | if (ret) | |
1766 | return ret; | |
1767 | } | |
1768 | /* From here on, disallow device driver I/O. */ | |
1769 | spin_lock_irq(sch->lock); | |
1770 | ret = cio_disable_subchannel(sch); | |
1771 | spin_unlock_irq(sch->lock); | |
1772 | ||
1773 | return ret; | |
1774 | } | |
1775 | ||
1776 | static int ccw_device_pm_thaw(struct device *dev) | |
1777 | { | |
1778 | struct ccw_device *cdev = to_ccwdev(dev); | |
1779 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1780 | int ret, cm_enabled; | |
1781 | ||
1782 | if (!cdev->online) | |
1783 | return 0; | |
1784 | ||
1785 | spin_lock_irq(sch->lock); | |
1786 | /* Allow device driver I/O again. */ | |
1787 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1788 | cm_enabled = cdev->private->cmb != NULL; | |
1789 | spin_unlock_irq(sch->lock); | |
1790 | if (ret) | |
1791 | return ret; | |
1792 | ||
1793 | if (cm_enabled) { | |
1794 | ret = ccw_set_cmf(cdev, 1); | |
1795 | if (ret) | |
1796 | return ret; | |
1797 | } | |
1798 | ||
1799 | if (cdev->drv && cdev->drv->thaw) | |
1800 | ret = cdev->drv->thaw(cdev); | |
1801 | ||
1802 | return ret; | |
1803 | } | |
1804 | ||
1805 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
1806 | { | |
1807 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
823d494a | 1808 | |
0d01bb89 SO |
1809 | spin_lock_irq(sch->lock); |
1810 | if (cio_is_console(sch->schid)) { | |
1811 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1812 | goto out_unlock; | |
1813 | } | |
823d494a SO |
1814 | /* |
1815 | * While we were sleeping, devices may have gone or become | |
1816 | * available again. Kick re-detection. | |
1817 | */ | |
823d494a | 1818 | cdev->private->flags.resuming = 1; |
0d01bb89 SO |
1819 | css_schedule_eval(sch->schid); |
1820 | spin_unlock_irq(sch->lock); | |
1821 | css_complete_work(); | |
1822 | ||
1823 | /* cdev may have been moved to a different subchannel. */ | |
1824 | sch = to_subchannel(cdev->dev.parent); | |
1825 | spin_lock_irq(sch->lock); | |
1826 | if (cdev->private->state != DEV_STATE_ONLINE && | |
1827 | cdev->private->state != DEV_STATE_OFFLINE) | |
1828 | goto out_unlock; | |
1829 | ||
736b5db8 | 1830 | ccw_device_recognition(cdev); |
823d494a | 1831 | spin_unlock_irq(sch->lock); |
823d494a SO |
1832 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || |
1833 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
0d01bb89 SO |
1834 | spin_lock_irq(sch->lock); |
1835 | ||
1836 | out_unlock: | |
823d494a | 1837 | cdev->private->flags.resuming = 0; |
0d01bb89 | 1838 | spin_unlock_irq(sch->lock); |
823d494a SO |
1839 | } |
1840 | ||
1841 | static int resume_handle_boxed(struct ccw_device *cdev) | |
1842 | { | |
1843 | cdev->private->state = DEV_STATE_BOXED; | |
76e6fb4b | 1844 | if (ccw_device_notify(cdev, CIO_BOXED) == NOTIFY_OK) |
823d494a | 1845 | return 0; |
37de53bb | 1846 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1847 | return -ENODEV; |
1848 | } | |
1849 | ||
1850 | static int resume_handle_disc(struct ccw_device *cdev) | |
1851 | { | |
1852 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
76e6fb4b | 1853 | if (ccw_device_notify(cdev, CIO_GONE) == NOTIFY_OK) |
823d494a | 1854 | return 0; |
37de53bb | 1855 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1856 | return -ENODEV; |
1857 | } | |
1858 | ||
1859 | static int ccw_device_pm_restore(struct device *dev) | |
1860 | { | |
1861 | struct ccw_device *cdev = to_ccwdev(dev); | |
0d01bb89 SO |
1862 | struct subchannel *sch; |
1863 | int ret = 0; | |
823d494a SO |
1864 | |
1865 | __ccw_device_pm_restore(cdev); | |
0d01bb89 | 1866 | sch = to_subchannel(cdev->dev.parent); |
823d494a | 1867 | spin_lock_irq(sch->lock); |
0d01bb89 | 1868 | if (cio_is_console(sch->schid)) |
823d494a | 1869 | goto out_restore; |
0d01bb89 | 1870 | |
823d494a SO |
1871 | /* check recognition results */ |
1872 | switch (cdev->private->state) { | |
1873 | case DEV_STATE_OFFLINE: | |
0d01bb89 SO |
1874 | case DEV_STATE_ONLINE: |
1875 | cdev->private->flags.donotify = 0; | |
823d494a SO |
1876 | break; |
1877 | case DEV_STATE_BOXED: | |
1878 | ret = resume_handle_boxed(cdev); | |
823d494a | 1879 | if (ret) |
0d01bb89 | 1880 | goto out_unlock; |
823d494a | 1881 | goto out_restore; |
823d494a | 1882 | default: |
0d01bb89 SO |
1883 | ret = resume_handle_disc(cdev); |
1884 | if (ret) | |
1885 | goto out_unlock; | |
1886 | goto out_restore; | |
823d494a SO |
1887 | } |
1888 | /* check if the device type has changed */ | |
1889 | if (!ccw_device_test_sense_data(cdev)) { | |
1890 | ccw_device_update_sense_data(cdev); | |
37de53bb | 1891 | ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); |
823d494a SO |
1892 | ret = -ENODEV; |
1893 | goto out_unlock; | |
1894 | } | |
0d01bb89 | 1895 | if (!cdev->online) |
823d494a | 1896 | goto out_unlock; |
823d494a | 1897 | |
0d01bb89 SO |
1898 | if (ccw_device_online(cdev)) { |
1899 | ret = resume_handle_disc(cdev); | |
1900 | if (ret) | |
1901 | goto out_unlock; | |
1902 | goto out_restore; | |
1903 | } | |
823d494a | 1904 | spin_unlock_irq(sch->lock); |
823d494a | 1905 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
0d01bb89 SO |
1906 | spin_lock_irq(sch->lock); |
1907 | ||
1908 | if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) { | |
1909 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1910 | ret = -ENODEV; | |
1911 | goto out_unlock; | |
823d494a | 1912 | } |
0d01bb89 SO |
1913 | |
1914 | /* reenable cmf, if needed */ | |
1915 | if (cdev->private->cmb) { | |
1916 | spin_unlock_irq(sch->lock); | |
823d494a | 1917 | ret = ccw_set_cmf(cdev, 1); |
0d01bb89 | 1918 | spin_lock_irq(sch->lock); |
823d494a | 1919 | if (ret) { |
f014824e SO |
1920 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
1921 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
1922 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
1923 | ret = 0; |
1924 | } | |
1925 | } | |
1926 | ||
1927 | out_restore: | |
0d01bb89 | 1928 | spin_unlock_irq(sch->lock); |
823d494a SO |
1929 | if (cdev->online && cdev->drv && cdev->drv->restore) |
1930 | ret = cdev->drv->restore(cdev); | |
823d494a SO |
1931 | return ret; |
1932 | ||
823d494a SO |
1933 | out_unlock: |
1934 | spin_unlock_irq(sch->lock); | |
1935 | return ret; | |
1936 | } | |
1937 | ||
47145210 | 1938 | static const struct dev_pm_ops ccw_pm_ops = { |
823d494a SO |
1939 | .prepare = ccw_device_pm_prepare, |
1940 | .complete = ccw_device_pm_complete, | |
1941 | .freeze = ccw_device_pm_freeze, | |
1942 | .thaw = ccw_device_pm_thaw, | |
1943 | .restore = ccw_device_pm_restore, | |
1944 | }; | |
1945 | ||
8bbace7e CH |
1946 | struct bus_type ccw_bus_type = { |
1947 | .name = "ccw", | |
1948 | .match = ccw_bus_match, | |
1949 | .uevent = ccw_uevent, | |
1950 | .probe = ccw_device_probe, | |
1951 | .remove = ccw_device_remove, | |
958974fb | 1952 | .shutdown = ccw_device_shutdown, |
823d494a | 1953 | .pm = &ccw_pm_ops, |
8bbace7e CH |
1954 | }; |
1955 | ||
b2ffd8e9 CH |
1956 | /** |
1957 | * ccw_driver_register() - register a ccw driver | |
1958 | * @cdriver: driver to be registered | |
1959 | * | |
1960 | * This function is mainly a wrapper around driver_register(). | |
1961 | * Returns: | |
1962 | * %0 on success and a negative error value on failure. | |
1963 | */ | |
1964 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
1965 | { |
1966 | struct device_driver *drv = &cdriver->driver; | |
1967 | ||
1968 | drv->bus = &ccw_bus_type; | |
1969 | drv->name = cdriver->name; | |
4beee646 | 1970 | drv->owner = cdriver->owner; |
1da177e4 LT |
1971 | |
1972 | return driver_register(drv); | |
1973 | } | |
1974 | ||
b2ffd8e9 CH |
1975 | /** |
1976 | * ccw_driver_unregister() - deregister a ccw driver | |
1977 | * @cdriver: driver to be deregistered | |
1978 | * | |
1979 | * This function is mainly a wrapper around driver_unregister(). | |
1980 | */ | |
1981 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
1982 | { |
1983 | driver_unregister(&cdriver->driver); | |
1984 | } | |
1985 | ||
a8237fc4 CH |
1986 | /* Helper func for qdio. */ |
1987 | struct subchannel_id | |
1988 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1989 | { | |
1990 | struct subchannel *sch; | |
1991 | ||
1992 | sch = to_subchannel(cdev->dev.parent); | |
1993 | return sch->schid; | |
1994 | } | |
1995 | ||
37de53bb PO |
1996 | static void ccw_device_todo(struct work_struct *work) |
1997 | { | |
1998 | struct ccw_device_private *priv; | |
1999 | struct ccw_device *cdev; | |
2000 | struct subchannel *sch; | |
2001 | enum cdev_todo todo; | |
2002 | ||
2003 | priv = container_of(work, struct ccw_device_private, todo_work); | |
2004 | cdev = priv->cdev; | |
2005 | sch = to_subchannel(cdev->dev.parent); | |
2006 | /* Find out todo. */ | |
2007 | spin_lock_irq(cdev->ccwlock); | |
2008 | todo = priv->todo; | |
2009 | priv->todo = CDEV_TODO_NOTHING; | |
2010 | CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n", | |
2011 | priv->dev_id.ssid, priv->dev_id.devno, todo); | |
2012 | spin_unlock_irq(cdev->ccwlock); | |
2013 | /* Perform todo. */ | |
2014 | switch (todo) { | |
2015 | case CDEV_TODO_ENABLE_CMF: | |
2016 | cmf_reenable(cdev); | |
2017 | break; | |
2018 | case CDEV_TODO_REBIND: | |
2019 | ccw_device_do_unbind_bind(cdev); | |
2020 | break; | |
2021 | case CDEV_TODO_REGISTER: | |
2022 | io_subchannel_register(cdev); | |
2023 | break; | |
2024 | case CDEV_TODO_UNREG_EVAL: | |
2025 | if (!sch_is_pseudo_sch(sch)) | |
2026 | css_schedule_eval(sch->schid); | |
2027 | /* fall-through */ | |
2028 | case CDEV_TODO_UNREG: | |
2029 | if (sch_is_pseudo_sch(sch)) | |
2030 | ccw_device_unregister(cdev); | |
2031 | else | |
2032 | ccw_device_call_sch_unregister(cdev); | |
2033 | break; | |
2034 | default: | |
2035 | break; | |
2036 | } | |
2037 | /* Release workqueue ref. */ | |
2038 | put_device(&cdev->dev); | |
2039 | } | |
2040 | ||
2041 | /** | |
2042 | * ccw_device_sched_todo - schedule ccw device operation | |
2043 | * @cdev: ccw device | |
2044 | * @todo: todo | |
2045 | * | |
2046 | * Schedule the operation identified by @todo to be performed on the slow path | |
2047 | * workqueue. Do nothing if another operation with higher priority is already | |
2048 | * scheduled. Needs to be called with ccwdev lock held. | |
2049 | */ | |
2050 | void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo) | |
2051 | { | |
2052 | CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n", | |
2053 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
2054 | todo); | |
2055 | if (cdev->private->todo >= todo) | |
2056 | return; | |
2057 | cdev->private->todo = todo; | |
2058 | /* Get workqueue ref. */ | |
2059 | if (!get_device(&cdev->dev)) | |
2060 | return; | |
be5d3823 | 2061 | if (!queue_work(cio_work_q, &cdev->private->todo_work)) { |
37de53bb PO |
2062 | /* Already queued, release workqueue ref. */ |
2063 | put_device(&cdev->dev); | |
2064 | } | |
2065 | } | |
2066 | ||
fd0457a6 ME |
2067 | /** |
2068 | * ccw_device_siosl() - initiate logging | |
2069 | * @cdev: ccw device | |
2070 | * | |
2071 | * This function is used to invoke model-dependent logging within the channel | |
2072 | * subsystem. | |
2073 | */ | |
2074 | int ccw_device_siosl(struct ccw_device *cdev) | |
2075 | { | |
2076 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
2077 | ||
2078 | return chsc_siosl(sch->schid); | |
2079 | } | |
2080 | EXPORT_SYMBOL_GPL(ccw_device_siosl); | |
2081 | ||
1da177e4 LT |
2082 | MODULE_LICENSE("GPL"); |
2083 | EXPORT_SYMBOL(ccw_device_set_online); | |
2084 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2085 | EXPORT_SYMBOL(ccw_driver_register); | |
2086 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2087 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
2088 | EXPORT_SYMBOL(ccw_bus_type); | |
a8237fc4 | 2089 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |