Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device.c | |
3 | * bus driver for ccw devices | |
1da177e4 | 4 | * |
c820de39 | 5 | * Copyright IBM Corp. 2002,2008 |
1da177e4 | 6 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) |
4ce3b30c | 7 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
8 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
9 | */ | |
a7ae2c02 PO |
10 | |
11 | #define KMSG_COMPONENT "cio" | |
12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
13 | ||
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/spinlock.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/workqueue.h> | |
90ab1336 | 23 | #include <linux/timer.h> |
1da177e4 LT |
24 | |
25 | #include <asm/ccwdev.h> | |
26 | #include <asm/cio.h> | |
4e57b681 | 27 | #include <asm/param.h> /* HZ */ |
1842f2b1 | 28 | #include <asm/cmb.h> |
3a3fc29a | 29 | #include <asm/isc.h> |
1da177e4 | 30 | |
0ae7a7b2 | 31 | #include "chp.h" |
1da177e4 | 32 | #include "cio.h" |
d7b5a4c9 | 33 | #include "cio_debug.h" |
1da177e4 LT |
34 | #include "css.h" |
35 | #include "device.h" | |
36 | #include "ioasm.h" | |
cd6b4f27 | 37 | #include "io_sch.h" |
ecf5d9ef | 38 | #include "blacklist.h" |
1da177e4 | 39 | |
90ab1336 | 40 | static struct timer_list recovery_timer; |
486d0a00 | 41 | static DEFINE_SPINLOCK(recovery_lock); |
90ab1336 PO |
42 | static int recovery_phase; |
43 | static const unsigned long recovery_delay[] = { 3, 30, 300 }; | |
44 | ||
1da177e4 LT |
45 | /******************* bus type handling ***********************/ |
46 | ||
47 | /* The Linux driver model distinguishes between a bus type and | |
48 | * the bus itself. Of course we only have one channel | |
49 | * subsystem driver and one channel system per machine, but | |
50 | * we still use the abstraction. T.R. says it's a good idea. */ | |
51 | static int | |
52 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
53 | { | |
54 | struct ccw_device *cdev = to_ccwdev(dev); | |
55 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
56 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
57 | ||
58 | if (!ids) | |
59 | return 0; | |
60 | ||
61 | found = ccw_device_id_match(ids, &cdev->id); | |
62 | if (!found) | |
63 | return 0; | |
64 | ||
65 | cdev->id.driver_info = found->driver_info; | |
66 | ||
67 | return 1; | |
68 | } | |
69 | ||
db0c2d59 PO |
70 | /* Store modalias string delimited by prefix/suffix string into buffer with |
71 | * specified size. Return length of resulting string (excluding trailing '\0') | |
72 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 73 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 74 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 75 | { |
db0c2d59 | 76 | int len; |
1da177e4 | 77 | |
cfbe9bb2 | 78 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
79 | if (len > size) |
80 | return len; | |
81 | buf += len; | |
82 | size -= len; | |
1da177e4 | 83 | |
db0c2d59 PO |
84 | if (id->dev_type != 0) |
85 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
86 | id->dev_model, suffix); | |
87 | else | |
88 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 89 | |
db0c2d59 PO |
90 | return len; |
91 | } | |
92 | ||
93 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
94 | * non-zero otherwise. */ | |
7eff2e7a | 95 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
96 | { |
97 | struct ccw_device *cdev = to_ccwdev(dev); | |
98 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
99 | int ret; |
100 | char modalias_buf[30]; | |
1da177e4 | 101 | |
db0c2d59 | 102 | /* CU_TYPE= */ |
7eff2e7a | 103 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
104 | if (ret) |
105 | return ret; | |
db0c2d59 PO |
106 | |
107 | /* CU_MODEL= */ | |
7eff2e7a | 108 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
109 | if (ret) |
110 | return ret; | |
1da177e4 LT |
111 | |
112 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 113 | /* DEV_TYPE= */ |
7eff2e7a | 114 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
115 | if (ret) |
116 | return ret; | |
1da177e4 | 117 | |
db0c2d59 | 118 | /* DEV_MODEL= */ |
7eff2e7a | 119 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
120 | if (ret) |
121 | return ret; | |
db0c2d59 PO |
122 | |
123 | /* MODALIAS= */ | |
cfbe9bb2 | 124 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
125 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
126 | return ret; | |
1da177e4 LT |
127 | } |
128 | ||
8bbace7e | 129 | struct bus_type ccw_bus_type; |
1da177e4 | 130 | |
602b20f2 CH |
131 | static void io_subchannel_irq(struct subchannel *); |
132 | static int io_subchannel_probe(struct subchannel *); | |
133 | static int io_subchannel_remove(struct subchannel *); | |
8bbace7e | 134 | static void io_subchannel_shutdown(struct subchannel *); |
c820de39 | 135 | static int io_subchannel_sch_event(struct subchannel *, int); |
99611f87 CH |
136 | static int io_subchannel_chp_event(struct subchannel *, struct chp_link *, |
137 | int); | |
8ea7f559 SO |
138 | static void recovery_func(unsigned long data); |
139 | struct workqueue_struct *ccw_device_work; | |
140 | wait_queue_head_t ccw_device_init_wq; | |
141 | atomic_t ccw_device_init_count; | |
1da177e4 | 142 | |
f08adc00 CH |
143 | static struct css_device_id io_subchannel_ids[] = { |
144 | { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, | |
145 | { /* end of list */ }, | |
146 | }; | |
147 | MODULE_DEVICE_TABLE(css, io_subchannel_ids); | |
148 | ||
93a27592 CH |
149 | static int io_subchannel_prepare(struct subchannel *sch) |
150 | { | |
151 | struct ccw_device *cdev; | |
152 | /* | |
153 | * Don't allow suspend while a ccw device registration | |
154 | * is still outstanding. | |
155 | */ | |
156 | cdev = sch_get_cdev(sch); | |
157 | if (cdev && !device_is_registered(&cdev->dev)) | |
158 | return -EAGAIN; | |
159 | return 0; | |
160 | } | |
161 | ||
8ea7f559 SO |
162 | static void io_subchannel_settle(void) |
163 | { | |
164 | wait_event(ccw_device_init_wq, | |
165 | atomic_read(&ccw_device_init_count) == 0); | |
166 | flush_workqueue(ccw_device_work); | |
167 | } | |
168 | ||
f7e5d67c | 169 | static struct css_driver io_subchannel_driver = { |
4beee646 | 170 | .owner = THIS_MODULE, |
f08adc00 | 171 | .subchannel_type = io_subchannel_ids, |
25b7bb58 | 172 | .name = "io_subchannel", |
1da177e4 | 173 | .irq = io_subchannel_irq, |
c820de39 CH |
174 | .sch_event = io_subchannel_sch_event, |
175 | .chp_event = io_subchannel_chp_event, | |
8bbace7e CH |
176 | .probe = io_subchannel_probe, |
177 | .remove = io_subchannel_remove, | |
178 | .shutdown = io_subchannel_shutdown, | |
93a27592 | 179 | .prepare = io_subchannel_prepare, |
8ea7f559 | 180 | .settle = io_subchannel_settle, |
1da177e4 LT |
181 | }; |
182 | ||
2f17644d | 183 | int __init io_subchannel_init(void) |
1da177e4 LT |
184 | { |
185 | int ret; | |
186 | ||
187 | init_waitqueue_head(&ccw_device_init_wq); | |
188 | atomic_set(&ccw_device_init_count, 0); | |
90ab1336 | 189 | setup_timer(&recovery_timer, recovery_func, 0); |
1da177e4 LT |
190 | |
191 | ccw_device_work = create_singlethread_workqueue("cio"); | |
192 | if (!ccw_device_work) | |
2f17644d | 193 | return -ENOMEM; |
1da177e4 LT |
194 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); |
195 | if (!slow_path_wq) { | |
2f17644d | 196 | ret = -ENOMEM; |
1da177e4 LT |
197 | goto out_err; |
198 | } | |
199 | if ((ret = bus_register (&ccw_bus_type))) | |
200 | goto out_err; | |
201 | ||
25b7bb58 CH |
202 | ret = css_driver_register(&io_subchannel_driver); |
203 | if (ret) | |
1da177e4 LT |
204 | goto out_err; |
205 | ||
1da177e4 LT |
206 | return 0; |
207 | out_err: | |
208 | if (ccw_device_work) | |
209 | destroy_workqueue(ccw_device_work); | |
1da177e4 LT |
210 | if (slow_path_wq) |
211 | destroy_workqueue(slow_path_wq); | |
212 | return ret; | |
213 | } | |
214 | ||
1da177e4 LT |
215 | |
216 | /************************ device handling **************************/ | |
217 | ||
218 | /* | |
219 | * A ccw_device has some interfaces in sysfs in addition to the | |
220 | * standard ones. | |
221 | * The following entries are designed to export the information which | |
222 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
223 | * are obvious, so they don't have an entry :) | |
224 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
225 | */ | |
226 | static ssize_t | |
3fd3c0a5 | 227 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
228 | { |
229 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 230 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
231 | ssize_t ret = 0; |
232 | int chp; | |
7ad6a249 PO |
233 | int mask; |
234 | ||
235 | for (chp = 0; chp < 8; chp++) { | |
236 | mask = 0x80 >> chp; | |
237 | if (ssd->path_mask & mask) | |
238 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
239 | else | |
240 | ret += sprintf(buf + ret, "00 "); | |
241 | } | |
1da177e4 LT |
242 | ret += sprintf (buf+ret, "\n"); |
243 | return min((ssize_t)PAGE_SIZE, ret); | |
244 | } | |
245 | ||
246 | static ssize_t | |
3fd3c0a5 | 247 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
248 | { |
249 | struct subchannel *sch = to_subchannel(dev); | |
250 | struct pmcw *pmcw = &sch->schib.pmcw; | |
251 | ||
252 | return sprintf (buf, "%02x %02x %02x\n", | |
253 | pmcw->pim, pmcw->pam, pmcw->pom); | |
254 | } | |
255 | ||
256 | static ssize_t | |
3fd3c0a5 | 257 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
258 | { |
259 | struct ccw_device *cdev = to_ccwdev(dev); | |
260 | struct ccw_device_id *id = &(cdev->id); | |
261 | ||
262 | if (id->dev_type != 0) | |
263 | return sprintf(buf, "%04x/%02x\n", | |
264 | id->dev_type, id->dev_model); | |
265 | else | |
266 | return sprintf(buf, "n/a\n"); | |
267 | } | |
268 | ||
269 | static ssize_t | |
3fd3c0a5 | 270 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
271 | { |
272 | struct ccw_device *cdev = to_ccwdev(dev); | |
273 | struct ccw_device_id *id = &(cdev->id); | |
274 | ||
275 | return sprintf(buf, "%04x/%02x\n", | |
276 | id->cu_type, id->cu_model); | |
277 | } | |
278 | ||
f1fc78a8 BB |
279 | static ssize_t |
280 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
281 | { | |
282 | struct ccw_device *cdev = to_ccwdev(dev); | |
283 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 284 | int len; |
f1fc78a8 | 285 | |
086a6c62 | 286 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
287 | |
288 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
289 | } |
290 | ||
1da177e4 | 291 | static ssize_t |
3fd3c0a5 | 292 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
293 | { |
294 | struct ccw_device *cdev = to_ccwdev(dev); | |
295 | ||
296 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
297 | } | |
298 | ||
d7b5a4c9 CH |
299 | int ccw_device_is_orphan(struct ccw_device *cdev) |
300 | { | |
301 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
302 | } | |
303 | ||
ef99516c | 304 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 305 | { |
7d253b9a | 306 | if (device_is_registered(&cdev->dev)) { |
24a1872d | 307 | /* Undo device_add(). */ |
ef99516c | 308 | device_del(&cdev->dev); |
24a1872d SO |
309 | } |
310 | if (cdev->private->flags.initialized) { | |
311 | cdev->private->flags.initialized = 0; | |
3b554a14 SO |
312 | /* Release reference from device_initialize(). */ |
313 | put_device(&cdev->dev); | |
314 | } | |
7674da77 CH |
315 | } |
316 | ||
d40f7b75 SO |
317 | static void io_subchannel_quiesce(struct subchannel *); |
318 | ||
b2ffd8e9 CH |
319 | /** |
320 | * ccw_device_set_offline() - disable a ccw device for I/O | |
321 | * @cdev: target ccw device | |
322 | * | |
323 | * This function calls the driver's set_offline() function for @cdev, if | |
324 | * given, and then disables @cdev. | |
325 | * Returns: | |
326 | * %0 on success and a negative error value on failure. | |
327 | * Context: | |
328 | * enabled, ccw device lock not held | |
329 | */ | |
330 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 | 331 | { |
d40f7b75 SO |
332 | struct subchannel *sch; |
333 | int ret, state; | |
1da177e4 LT |
334 | |
335 | if (!cdev) | |
336 | return -ENODEV; | |
337 | if (!cdev->online || !cdev->drv) | |
338 | return -EINVAL; | |
339 | ||
340 | if (cdev->drv->set_offline) { | |
341 | ret = cdev->drv->set_offline(cdev); | |
342 | if (ret != 0) | |
343 | return ret; | |
344 | } | |
345 | cdev->online = 0; | |
346 | spin_lock_irq(cdev->ccwlock); | |
d40f7b75 | 347 | sch = to_subchannel(cdev->dev.parent); |
217ee6c6 ME |
348 | /* Wait until a final state or DISCONNECTED is reached */ |
349 | while (!dev_fsm_final_state(cdev) && | |
350 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
1da177e4 | 351 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
352 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
353 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
354 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 | 355 | } |
d40f7b75 SO |
356 | do { |
357 | ret = ccw_device_offline(cdev); | |
358 | if (!ret) | |
359 | break; | |
360 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device " | |
361 | "0.%x.%04x\n", ret, cdev->private->dev_id.ssid, | |
362 | cdev->private->dev_id.devno); | |
363 | if (ret != -EBUSY) | |
364 | goto error; | |
365 | state = cdev->private->state; | |
366 | spin_unlock_irq(cdev->ccwlock); | |
367 | io_subchannel_quiesce(sch); | |
368 | spin_lock_irq(cdev->ccwlock); | |
369 | cdev->private->state = state; | |
370 | } while (ret == -EBUSY); | |
1da177e4 | 371 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
372 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
373 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
a7ae2c02 PO |
374 | /* Inform the user if set offline failed. */ |
375 | if (cdev->private->state == DEV_STATE_BOXED) { | |
376 | pr_warning("%s: The device entered boxed state while " | |
377 | "being set offline\n", dev_name(&cdev->dev)); | |
378 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
379 | pr_warning("%s: The device stopped operating while " | |
380 | "being set offline\n", dev_name(&cdev->dev)); | |
381 | } | |
217ee6c6 ME |
382 | /* Give up reference from ccw_device_set_online(). */ |
383 | put_device(&cdev->dev); | |
384 | return 0; | |
385 | ||
386 | error: | |
217ee6c6 ME |
387 | cdev->private->state = DEV_STATE_OFFLINE; |
388 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
389 | spin_unlock_irq(cdev->ccwlock); | |
390 | /* Give up reference from ccw_device_set_online(). */ | |
391 | put_device(&cdev->dev); | |
392 | return -ENODEV; | |
1da177e4 LT |
393 | } |
394 | ||
b2ffd8e9 CH |
395 | /** |
396 | * ccw_device_set_online() - enable a ccw device for I/O | |
397 | * @cdev: target ccw device | |
398 | * | |
399 | * This function first enables @cdev and then calls the driver's set_online() | |
400 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
401 | * disabled again. | |
402 | * Returns: | |
403 | * %0 on success and a negative error value on failure. | |
404 | * Context: | |
405 | * enabled, ccw device lock not held | |
406 | */ | |
407 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
408 | { |
409 | int ret; | |
217ee6c6 | 410 | int ret2; |
1da177e4 LT |
411 | |
412 | if (!cdev) | |
413 | return -ENODEV; | |
414 | if (cdev->online || !cdev->drv) | |
415 | return -EINVAL; | |
9cd67421 CH |
416 | /* Hold on to an extra reference while device is online. */ |
417 | if (!get_device(&cdev->dev)) | |
418 | return -ENODEV; | |
1da177e4 LT |
419 | |
420 | spin_lock_irq(cdev->ccwlock); | |
421 | ret = ccw_device_online(cdev); | |
422 | spin_unlock_irq(cdev->ccwlock); | |
423 | if (ret == 0) | |
424 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
425 | else { | |
139b83dd | 426 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
427 | "device 0.%x.%04x\n", |
428 | ret, cdev->private->dev_id.ssid, | |
429 | cdev->private->dev_id.devno); | |
9cd67421 CH |
430 | /* Give up online reference since onlining failed. */ |
431 | put_device(&cdev->dev); | |
1da177e4 LT |
432 | return ret; |
433 | } | |
217ee6c6 ME |
434 | spin_lock_irq(cdev->ccwlock); |
435 | /* Check if online processing was successful */ | |
436 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
437 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
438 | spin_unlock_irq(cdev->ccwlock); | |
a7ae2c02 PO |
439 | /* Inform the user that set online failed. */ |
440 | if (cdev->private->state == DEV_STATE_BOXED) { | |
441 | pr_warning("%s: Setting the device online failed " | |
442 | "because it is boxed\n", | |
443 | dev_name(&cdev->dev)); | |
444 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
445 | pr_warning("%s: Setting the device online failed " | |
446 | "because it is not operational\n", | |
447 | dev_name(&cdev->dev)); | |
448 | } | |
9cd67421 CH |
449 | /* Give up online reference since onlining failed. */ |
450 | put_device(&cdev->dev); | |
1da177e4 | 451 | return -ENODEV; |
9cd67421 | 452 | } |
217ee6c6 ME |
453 | spin_unlock_irq(cdev->ccwlock); |
454 | if (cdev->drv->set_online) | |
455 | ret = cdev->drv->set_online(cdev); | |
456 | if (ret) | |
457 | goto rollback; | |
458 | cdev->online = 1; | |
459 | return 0; | |
460 | ||
461 | rollback: | |
1da177e4 | 462 | spin_lock_irq(cdev->ccwlock); |
217ee6c6 ME |
463 | /* Wait until a final state or DISCONNECTED is reached */ |
464 | while (!dev_fsm_final_state(cdev) && | |
465 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
466 | spin_unlock_irq(cdev->ccwlock); | |
467 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
468 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
469 | spin_lock_irq(cdev->ccwlock); | |
470 | } | |
471 | ret2 = ccw_device_offline(cdev); | |
472 | if (ret2) | |
473 | goto error; | |
474 | spin_unlock_irq(cdev->ccwlock); | |
475 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
476 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
477 | /* Give up online reference since onlining failed. */ | |
478 | put_device(&cdev->dev); | |
479 | return ret; | |
480 | ||
481 | error: | |
482 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
483 | "device 0.%x.%04x\n", | |
484 | ret2, cdev->private->dev_id.ssid, | |
485 | cdev->private->dev_id.devno); | |
486 | cdev->private->state = DEV_STATE_OFFLINE; | |
1da177e4 | 487 | spin_unlock_irq(cdev->ccwlock); |
9cd67421 CH |
488 | /* Give up online reference since onlining failed. */ |
489 | put_device(&cdev->dev); | |
217ee6c6 | 490 | return ret; |
1da177e4 LT |
491 | } |
492 | ||
e74fe0ce | 493 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 | 494 | { |
37de53bb PO |
495 | if (cdev->private->state == DEV_STATE_DISCONNECTED) { |
496 | spin_lock_irq(cdev->ccwlock); | |
497 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); | |
498 | spin_unlock_irq(cdev->ccwlock); | |
499 | } else if (cdev->online && cdev->drv && cdev->drv->set_offline) | |
e74fe0ce SO |
500 | return ccw_device_set_offline(cdev); |
501 | return 0; | |
f5ba6c86 CH |
502 | } |
503 | ||
504 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
505 | { | |
f5ba6c86 | 506 | /* Do device recognition, if needed. */ |
99f6a570 | 507 | if (cdev->private->state == DEV_STATE_BOXED) { |
1f5bd384 | 508 | spin_lock_irq(cdev->ccwlock); |
736b5db8 | 509 | ccw_device_recognition(cdev); |
1f5bd384 | 510 | spin_unlock_irq(cdev->ccwlock); |
f5ba6c86 CH |
511 | wait_event(cdev->private->wait_q, |
512 | cdev->private->flags.recog_done); | |
156013ff SO |
513 | if (cdev->private->state != DEV_STATE_OFFLINE) |
514 | /* recognition failed */ | |
515 | return -EAGAIN; | |
f5ba6c86 CH |
516 | } |
517 | if (cdev->drv && cdev->drv->set_online) | |
518 | ccw_device_set_online(cdev); | |
519 | return 0; | |
520 | } | |
156013ff | 521 | |
c78aa6cb | 522 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
523 | { |
524 | int ret; | |
525 | ||
526 | ret = online_store_recog_and_online(cdev); | |
156013ff | 527 | if (ret && !force) |
c78aa6cb | 528 | return ret; |
f5ba6c86 CH |
529 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
530 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
531 | if (ret) |
532 | return ret; | |
f5ba6c86 CH |
533 | if (cdev->id.cu_type == 0) |
534 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
535 | ret = online_store_recog_and_online(cdev); |
536 | if (ret) | |
537 | return ret; | |
f5ba6c86 | 538 | } |
c78aa6cb | 539 | return 0; |
f5ba6c86 CH |
540 | } |
541 | ||
542 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
543 | const char *buf, size_t count) | |
1da177e4 LT |
544 | { |
545 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
546 | int force, ret; |
547 | unsigned long i; | |
1da177e4 | 548 | |
350e9120 PO |
549 | if (!dev_fsm_final_state(cdev) && |
550 | cdev->private->state != DEV_STATE_DISCONNECTED) | |
551 | return -EAGAIN; | |
552 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) | |
1da177e4 LT |
553 | return -EAGAIN; |
554 | ||
555 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
556 | atomic_set(&cdev->private->onoff, 0); | |
557 | return -EINVAL; | |
558 | } | |
559 | if (!strncmp(buf, "force\n", count)) { | |
560 | force = 1; | |
561 | i = 1; | |
2f972202 | 562 | ret = 0; |
1da177e4 LT |
563 | } else { |
564 | force = 0; | |
2f972202 | 565 | ret = strict_strtoul(buf, 16, &i); |
1da177e4 | 566 | } |
2f972202 CH |
567 | if (ret) |
568 | goto out; | |
f5ba6c86 CH |
569 | switch (i) { |
570 | case 0: | |
e74fe0ce | 571 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
572 | break; |
573 | case 1: | |
c78aa6cb | 574 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
575 | break; |
576 | default: | |
2f972202 | 577 | ret = -EINVAL; |
1da177e4 | 578 | } |
2f972202 | 579 | out: |
1da177e4 LT |
580 | if (cdev->drv) |
581 | module_put(cdev->drv->owner); | |
582 | atomic_set(&cdev->private->onoff, 0); | |
e74fe0ce | 583 | return (ret < 0) ? ret : count; |
1da177e4 LT |
584 | } |
585 | ||
586 | static ssize_t | |
3fd3c0a5 | 587 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
588 | { |
589 | struct ccw_device *cdev = to_ccwdev(dev); | |
590 | struct subchannel *sch; | |
591 | ||
d7b5a4c9 CH |
592 | if (ccw_device_is_orphan(cdev)) |
593 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
594 | switch (cdev->private->state) { |
595 | case DEV_STATE_BOXED: | |
596 | return sprintf(buf, "boxed\n"); | |
597 | case DEV_STATE_DISCONNECTED: | |
598 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
599 | case DEV_STATE_NOT_OPER: | |
600 | sch = to_subchannel(dev->parent); | |
601 | if (!sch->lpm) | |
602 | return sprintf(buf, "no path\n"); | |
603 | else | |
604 | return sprintf(buf, "no device\n"); | |
605 | default: | |
606 | /* All other states considered fine. */ | |
607 | return sprintf(buf, "good\n"); | |
608 | } | |
609 | } | |
610 | ||
611 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
612 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
613 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
614 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 615 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 616 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 LT |
617 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
618 | ||
7e9db9ea | 619 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
620 | &dev_attr_chpids.attr, |
621 | &dev_attr_pimpampom.attr, | |
622 | NULL, | |
623 | }; | |
624 | ||
7e9db9ea CH |
625 | static struct attribute_group io_subchannel_attr_group = { |
626 | .attrs = io_subchannel_attrs, | |
529192f3 | 627 | }; |
1da177e4 LT |
628 | |
629 | static struct attribute * ccwdev_attrs[] = { | |
630 | &dev_attr_devtype.attr, | |
631 | &dev_attr_cutype.attr, | |
f1fc78a8 | 632 | &dev_attr_modalias.attr, |
1da177e4 LT |
633 | &dev_attr_online.attr, |
634 | &dev_attr_cmb_enable.attr, | |
635 | &dev_attr_availability.attr, | |
636 | NULL, | |
637 | }; | |
638 | ||
639 | static struct attribute_group ccwdev_attr_group = { | |
640 | .attrs = ccwdev_attrs, | |
641 | }; | |
642 | ||
a4dbd674 | 643 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
644 | &ccwdev_attr_group, |
645 | NULL, | |
646 | }; | |
1da177e4 LT |
647 | |
648 | /* this is a simple abstraction for device_register that sets the | |
649 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 650 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
651 | { |
652 | struct device *dev = &cdev->dev; | |
653 | int ret; | |
654 | ||
655 | dev->bus = &ccw_bus_type; | |
3ac276f8 SO |
656 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
657 | cdev->private->dev_id.devno); | |
658 | if (ret) | |
659 | return ret; | |
7d253b9a | 660 | return device_add(dev); |
1da177e4 LT |
661 | } |
662 | ||
5d6e6b6f | 663 | static int match_dev_id(struct device *dev, void *data) |
b0744bd2 | 664 | { |
5d6e6b6f PO |
665 | struct ccw_device *cdev = to_ccwdev(dev); |
666 | struct ccw_dev_id *dev_id = data; | |
d7b5a4c9 | 667 | |
d7b5a4c9 CH |
668 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); |
669 | } | |
670 | ||
5d6e6b6f | 671 | static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id) |
d7b5a4c9 CH |
672 | { |
673 | struct device *dev; | |
674 | ||
5d6e6b6f | 675 | dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id); |
d7b5a4c9 CH |
676 | |
677 | return dev ? to_ccwdev(dev) : NULL; | |
678 | } | |
679 | ||
37de53bb | 680 | static void ccw_device_do_unbind_bind(struct ccw_device *cdev) |
1da177e4 | 681 | { |
eb32ae8d | 682 | int ret; |
1da177e4 | 683 | |
7d253b9a | 684 | if (device_is_registered(&cdev->dev)) { |
eb32ae8d CH |
685 | device_release_driver(&cdev->dev); |
686 | ret = device_attach(&cdev->dev); | |
687 | WARN_ON(ret == -ENODEV); | |
688 | } | |
1da177e4 LT |
689 | } |
690 | ||
691 | static void | |
692 | ccw_device_release(struct device *dev) | |
693 | { | |
694 | struct ccw_device *cdev; | |
695 | ||
696 | cdev = to_ccwdev(dev); | |
6eff208f CH |
697 | /* Release reference of parent subchannel. */ |
698 | put_device(cdev->dev.parent); | |
1da177e4 LT |
699 | kfree(cdev->private); |
700 | kfree(cdev); | |
701 | } | |
702 | ||
7674da77 CH |
703 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
704 | { | |
705 | struct ccw_device *cdev; | |
706 | ||
707 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
708 | if (cdev) { | |
709 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
710 | GFP_KERNEL | GFP_DMA); | |
711 | if (cdev->private) | |
712 | return cdev; | |
713 | } | |
714 | kfree(cdev); | |
715 | return ERR_PTR(-ENOMEM); | |
716 | } | |
717 | ||
37de53bb PO |
718 | static void ccw_device_todo(struct work_struct *work); |
719 | ||
7674da77 CH |
720 | static int io_subchannel_initialize_dev(struct subchannel *sch, |
721 | struct ccw_device *cdev) | |
722 | { | |
723 | cdev->private->cdev = cdev; | |
724 | atomic_set(&cdev->private->onoff, 0); | |
725 | cdev->dev.parent = &sch->dev; | |
726 | cdev->dev.release = ccw_device_release; | |
37de53bb | 727 | INIT_WORK(&cdev->private->todo_work, ccw_device_todo); |
ef99516c | 728 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
729 | /* Do first half of device_register. */ |
730 | device_initialize(&cdev->dev); | |
731 | if (!get_device(&sch->dev)) { | |
283fdd0b CH |
732 | /* Release reference from device_initialize(). */ |
733 | put_device(&cdev->dev); | |
7674da77 CH |
734 | return -ENODEV; |
735 | } | |
24a1872d | 736 | cdev->private->flags.initialized = 1; |
7674da77 CH |
737 | return 0; |
738 | } | |
739 | ||
740 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
741 | { | |
742 | struct ccw_device *cdev; | |
743 | int ret; | |
744 | ||
745 | cdev = io_subchannel_allocate_dev(sch); | |
746 | if (!IS_ERR(cdev)) { | |
747 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 748 | if (ret) |
7674da77 | 749 | cdev = ERR_PTR(ret); |
7674da77 CH |
750 | } |
751 | return cdev; | |
752 | } | |
753 | ||
736b5db8 | 754 | static void io_subchannel_recog(struct ccw_device *, struct subchannel *); |
d7b5a4c9 | 755 | |
d7b5a4c9 CH |
756 | static void sch_create_and_recog_new_device(struct subchannel *sch) |
757 | { | |
758 | struct ccw_device *cdev; | |
759 | ||
760 | /* Need to allocate a new ccw device. */ | |
761 | cdev = io_subchannel_create_ccwdev(sch); | |
762 | if (IS_ERR(cdev)) { | |
763 | /* OK, we did everything we could... */ | |
764 | css_sch_device_unregister(sch); | |
765 | return; | |
766 | } | |
d7b5a4c9 | 767 | /* Start recognition for the new ccw device. */ |
736b5db8 | 768 | io_subchannel_recog(cdev, sch); |
d7b5a4c9 CH |
769 | } |
770 | ||
1da177e4 LT |
771 | /* |
772 | * Register recognized device. | |
773 | */ | |
37de53bb | 774 | static void io_subchannel_register(struct ccw_device *cdev) |
1da177e4 | 775 | { |
1da177e4 LT |
776 | struct subchannel *sch; |
777 | int ret; | |
778 | unsigned long flags; | |
779 | ||
1da177e4 | 780 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
781 | /* |
782 | * Check if subchannel is still registered. It may have become | |
783 | * unregistered if a machine check hit us after finishing | |
784 | * device recognition but before the register work could be | |
785 | * queued. | |
786 | */ | |
787 | if (!device_is_registered(&sch->dev)) | |
788 | goto out_err; | |
82b7ac05 | 789 | css_update_ssd_info(sch); |
47af5518 CH |
790 | /* |
791 | * io_subchannel_register() will also be called after device | |
792 | * recognition has been done for a boxed device (which will already | |
793 | * be registered). We need to reprobe since we may now have sense id | |
794 | * information. | |
795 | */ | |
d6a30761 | 796 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
797 | if (!cdev->drv) { |
798 | ret = device_reprobe(&cdev->dev); | |
799 | if (ret) | |
800 | /* We can't do much here. */ | |
139b83dd | 801 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
802 | " %d for 0.%x.%04x\n", ret, |
803 | cdev->private->dev_id.ssid, | |
804 | cdev->private->dev_id.devno); | |
47af5518 | 805 | } |
1da177e4 LT |
806 | goto out; |
807 | } | |
fa1a8c23 CH |
808 | /* |
809 | * Now we know this subchannel will stay, we can throw | |
810 | * our delayed uevent. | |
811 | */ | |
f67f129e | 812 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 813 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 LT |
814 | /* make it known to the system */ |
815 | ret = ccw_device_register(cdev); | |
816 | if (ret) { | |
e556bbbd CH |
817 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
818 | cdev->private->dev_id.ssid, | |
819 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 820 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 821 | sch_set_cdev(sch, NULL); |
2ec22984 | 822 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
823 | /* Release initial device reference. */ |
824 | put_device(&cdev->dev); | |
5fb6b854 | 825 | goto out_err; |
1da177e4 | 826 | } |
1da177e4 LT |
827 | out: |
828 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 829 | wake_up(&cdev->private->wait_q); |
5fb6b854 | 830 | out_err: |
1da177e4 LT |
831 | if (atomic_dec_and_test(&ccw_device_init_count)) |
832 | wake_up(&ccw_device_init_wq); | |
833 | } | |
834 | ||
37de53bb | 835 | static void ccw_device_call_sch_unregister(struct ccw_device *cdev) |
1da177e4 | 836 | { |
1da177e4 LT |
837 | struct subchannel *sch; |
838 | ||
46fbe4e4 PO |
839 | /* Get subchannel reference for local processing. */ |
840 | if (!get_device(cdev->dev.parent)) | |
841 | return; | |
1da177e4 | 842 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 843 | css_sch_device_unregister(sch); |
46fbe4e4 | 844 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
845 | put_device(&sch->dev); |
846 | } | |
847 | ||
848 | /* | |
849 | * subchannel recognition done. Called from the state machine. | |
850 | */ | |
851 | void | |
852 | io_subchannel_recog_done(struct ccw_device *cdev) | |
853 | { | |
1da177e4 LT |
854 | if (css_init_done == 0) { |
855 | cdev->private->flags.recog_done = 1; | |
856 | return; | |
857 | } | |
858 | switch (cdev->private->state) { | |
47593bfa SO |
859 | case DEV_STATE_BOXED: |
860 | /* Device did not respond in time. */ | |
1da177e4 LT |
861 | case DEV_STATE_NOT_OPER: |
862 | cdev->private->flags.recog_done = 1; | |
37de53bb PO |
863 | /* Remove device found not operational. */ |
864 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1da177e4 LT |
865 | if (atomic_dec_and_test(&ccw_device_init_count)) |
866 | wake_up(&ccw_device_init_wq); | |
867 | break; | |
1da177e4 LT |
868 | case DEV_STATE_OFFLINE: |
869 | /* | |
870 | * We can't register the device in interrupt context so | |
871 | * we schedule a work item. | |
872 | */ | |
37de53bb | 873 | ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER); |
1da177e4 LT |
874 | break; |
875 | } | |
876 | } | |
877 | ||
736b5db8 | 878 | static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) |
1da177e4 | 879 | { |
1da177e4 LT |
880 | struct ccw_device_private *priv; |
881 | ||
2ec22984 | 882 | cdev->ccwlock = sch->lock; |
fb6958a5 | 883 | |
1da177e4 LT |
884 | /* Init private data. */ |
885 | priv = cdev->private; | |
78964268 CH |
886 | priv->dev_id.devno = sch->schib.pmcw.dev; |
887 | priv->dev_id.ssid = sch->schid.ssid; | |
888 | priv->schid = sch->schid; | |
1da177e4 LT |
889 | priv->state = DEV_STATE_NOT_OPER; |
890 | INIT_LIST_HEAD(&priv->cmb_list); | |
891 | init_waitqueue_head(&priv->wait_q); | |
892 | init_timer(&priv->timer); | |
893 | ||
1da177e4 LT |
894 | /* Increase counter of devices currently in recognition. */ |
895 | atomic_inc(&ccw_device_init_count); | |
896 | ||
897 | /* Start async. device sensing. */ | |
2ec22984 | 898 | spin_lock_irq(sch->lock); |
60e4dac1 | 899 | sch_set_cdev(sch, cdev); |
736b5db8 | 900 | ccw_device_recognition(cdev); |
2ec22984 | 901 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
902 | } |
903 | ||
5d6e6b6f PO |
904 | static int ccw_device_move_to_sch(struct ccw_device *cdev, |
905 | struct subchannel *sch) | |
d7b5a4c9 | 906 | { |
5d6e6b6f | 907 | struct subchannel *old_sch; |
0c609fca | 908 | int rc, old_enabled = 0; |
d7b5a4c9 | 909 | |
5d6e6b6f PO |
910 | old_sch = to_subchannel(cdev->dev.parent); |
911 | /* Obtain child reference for new parent. */ | |
6eff208f | 912 | if (!get_device(&sch->dev)) |
5d6e6b6f | 913 | return -ENODEV; |
0c609fca SO |
914 | |
915 | if (!sch_is_pseudo_sch(old_sch)) { | |
916 | spin_lock_irq(old_sch->lock); | |
917 | old_enabled = old_sch->schib.pmcw.ena; | |
918 | rc = 0; | |
919 | if (old_enabled) | |
920 | rc = cio_disable_subchannel(old_sch); | |
921 | spin_unlock_irq(old_sch->lock); | |
922 | if (rc == -EBUSY) { | |
923 | /* Release child reference for new parent. */ | |
924 | put_device(&sch->dev); | |
925 | return rc; | |
926 | } | |
927 | } | |
928 | ||
d7b5a4c9 | 929 | mutex_lock(&sch->reg_mutex); |
ffa6a705 | 930 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
931 | mutex_unlock(&sch->reg_mutex); |
932 | if (rc) { | |
5d6e6b6f | 933 | CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", |
d7b5a4c9 CH |
934 | cdev->private->dev_id.ssid, |
935 | cdev->private->dev_id.devno, sch->schid.ssid, | |
5d6e6b6f | 936 | sch->schib.pmcw.dev, rc); |
0c609fca SO |
937 | if (old_enabled) { |
938 | /* Try to reenable the old subchannel. */ | |
939 | spin_lock_irq(old_sch->lock); | |
940 | cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch); | |
941 | spin_unlock_irq(old_sch->lock); | |
942 | } | |
5d6e6b6f | 943 | /* Release child reference for new parent. */ |
6eff208f | 944 | put_device(&sch->dev); |
5d6e6b6f | 945 | return rc; |
d7b5a4c9 | 946 | } |
5d6e6b6f PO |
947 | /* Clean up old subchannel. */ |
948 | if (!sch_is_pseudo_sch(old_sch)) { | |
949 | spin_lock_irq(old_sch->lock); | |
950 | sch_set_cdev(old_sch, NULL); | |
5d6e6b6f PO |
951 | spin_unlock_irq(old_sch->lock); |
952 | css_schedule_eval(old_sch->schid); | |
d7b5a4c9 | 953 | } |
5d6e6b6f PO |
954 | /* Release child reference for old parent. */ |
955 | put_device(&old_sch->dev); | |
956 | /* Initialize new subchannel. */ | |
957 | spin_lock_irq(sch->lock); | |
958 | cdev->private->schid = sch->schid; | |
959 | cdev->ccwlock = sch->lock; | |
960 | if (!sch_is_pseudo_sch(sch)) | |
961 | sch_set_cdev(sch, cdev); | |
962 | spin_unlock_irq(sch->lock); | |
963 | if (!sch_is_pseudo_sch(sch)) | |
964 | css_update_ssd_info(sch); | |
965 | return 0; | |
966 | } | |
967 | ||
968 | static int ccw_device_move_to_orph(struct ccw_device *cdev) | |
969 | { | |
970 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
971 | struct channel_subsystem *css = to_css(sch->dev.parent); | |
972 | ||
973 | return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); | |
d7b5a4c9 CH |
974 | } |
975 | ||
602b20f2 CH |
976 | static void io_subchannel_irq(struct subchannel *sch) |
977 | { | |
978 | struct ccw_device *cdev; | |
979 | ||
db6a6423 | 980 | cdev = sch_get_cdev(sch); |
602b20f2 | 981 | |
efd986db SO |
982 | CIO_TRACE_EVENT(6, "IRQ"); |
983 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
984 | if (cdev) |
985 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
986 | } | |
987 | ||
13952ec1 SO |
988 | void io_subchannel_init_config(struct subchannel *sch) |
989 | { | |
990 | memset(&sch->config, 0, sizeof(sch->config)); | |
991 | sch->config.csense = 1; | |
13952ec1 SO |
992 | } |
993 | ||
0ae7a7b2 CH |
994 | static void io_subchannel_init_fields(struct subchannel *sch) |
995 | { | |
996 | if (cio_is_console(sch->schid)) | |
997 | sch->opm = 0xff; | |
998 | else | |
999 | sch->opm = chp_get_sch_opm(sch); | |
1000 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1001 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1002 | |
1003 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1004 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1005 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1006 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1007 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
1008 | |
1009 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1010 | } |
1011 | ||
90ed2b69 CH |
1012 | /* |
1013 | * Note: We always return 0 so that we bind to the device even on error. | |
1014 | * This is needed so that our remove function is called on unregister. | |
1015 | */ | |
0ae7a7b2 | 1016 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1017 | { |
1da177e4 LT |
1018 | struct ccw_device *cdev; |
1019 | int rc; | |
1da177e4 | 1020 | |
6d7c5afc | 1021 | if (cio_is_console(sch->schid)) { |
7e9db9ea CH |
1022 | rc = sysfs_create_group(&sch->dev.kobj, |
1023 | &io_subchannel_attr_group); | |
1024 | if (rc) | |
1025 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1026 | "attributes for subchannel " | |
1027 | "0.%x.%04x (rc=%d)\n", | |
1028 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 | 1029 | /* |
6d7c5afc | 1030 | * The console subchannel already has an associated ccw_device. |
7e9db9ea | 1031 | * Throw the delayed uevent for the subchannel, register |
6d7c5afc | 1032 | * the ccw_device and exit. |
1da177e4 | 1033 | */ |
f67f129e | 1034 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1035 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
6d7c5afc | 1036 | cdev = sch_get_cdev(sch); |
e1031786 | 1037 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 | 1038 | device_initialize(&cdev->dev); |
24a1872d | 1039 | cdev->private->flags.initialized = 1; |
1da177e4 | 1040 | ccw_device_register(cdev); |
1da177e4 LT |
1041 | /* |
1042 | * Check if the device is already online. If it is | |
9cd67421 CH |
1043 | * the reference count needs to be corrected since we |
1044 | * didn't obtain a reference in ccw_device_set_online. | |
1da177e4 LT |
1045 | */ |
1046 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1047 | cdev->private->state != DEV_STATE_OFFLINE && | |
1048 | cdev->private->state != DEV_STATE_BOXED) | |
1049 | get_device(&cdev->dev); | |
1050 | return 0; | |
1051 | } | |
0ae7a7b2 | 1052 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1053 | rc = cio_commit_config(sch); |
1054 | if (rc) | |
1055 | goto out_schedule; | |
7e9db9ea CH |
1056 | rc = sysfs_create_group(&sch->dev.kobj, |
1057 | &io_subchannel_attr_group); | |
1058 | if (rc) | |
90ed2b69 | 1059 | goto out_schedule; |
cd6b4f27 CH |
1060 | /* Allocate I/O subchannel private data. */ |
1061 | sch->private = kzalloc(sizeof(struct io_subchannel_private), | |
1062 | GFP_KERNEL | GFP_DMA); | |
90ed2b69 | 1063 | if (!sch->private) |
48e4c385 | 1064 | goto out_schedule; |
5d6e6b6f | 1065 | css_schedule_eval(sch->schid); |
7e9db9ea | 1066 | return 0; |
48e4c385 | 1067 | |
90ed2b69 | 1068 | out_schedule: |
390935ac PO |
1069 | spin_lock_irq(sch->lock); |
1070 | css_sched_sch_todo(sch, SCH_TODO_UNREG); | |
1071 | spin_unlock_irq(sch->lock); | |
90ed2b69 | 1072 | return 0; |
1da177e4 LT |
1073 | } |
1074 | ||
1da177e4 | 1075 | static int |
8bbace7e | 1076 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1077 | { |
1078 | struct ccw_device *cdev; | |
1da177e4 | 1079 | |
db6a6423 CH |
1080 | cdev = sch_get_cdev(sch); |
1081 | if (!cdev) | |
48e4c385 | 1082 | goto out_free; |
6e9a0f67 | 1083 | io_subchannel_quiesce(sch); |
1da177e4 | 1084 | /* Set ccw device to not operational and drop reference. */ |
7a8ad100 | 1085 | spin_lock_irq(cdev->ccwlock); |
db6a6423 | 1086 | sch_set_cdev(sch, NULL); |
1da177e4 | 1087 | cdev->private->state = DEV_STATE_NOT_OPER; |
7a8ad100 | 1088 | spin_unlock_irq(cdev->ccwlock); |
ef99516c | 1089 | ccw_device_unregister(cdev); |
48e4c385 | 1090 | out_free: |
cd6b4f27 | 1091 | kfree(sch->private); |
7e9db9ea | 1092 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1093 | return 0; |
1094 | } | |
1095 | ||
602b20f2 | 1096 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1097 | { |
1098 | struct ccw_device *cdev; | |
1099 | ||
db6a6423 | 1100 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1101 | if (cdev) |
1102 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1103 | } | |
1104 | ||
c820de39 CH |
1105 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1106 | { | |
1107 | struct ccw_device *cdev; | |
1108 | ||
1109 | cdev = sch_get_cdev(sch); | |
1110 | if (!cdev) | |
1111 | return; | |
4257aaec PO |
1112 | if (cio_update_schib(sch)) |
1113 | goto err; | |
1114 | /* Check for I/O on path. */ | |
1115 | if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask) | |
1116 | goto out; | |
1117 | if (cdev->private->state == DEV_STATE_ONLINE) { | |
1118 | ccw_device_kill_io(cdev); | |
1119 | goto out; | |
1120 | } | |
1121 | if (cio_clear(sch)) | |
1122 | goto err; | |
1123 | out: | |
1124 | /* Trigger path verification. */ | |
1125 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1126 | return; | |
c820de39 | 1127 | |
4257aaec PO |
1128 | err: |
1129 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
c820de39 CH |
1130 | } |
1131 | ||
99611f87 CH |
1132 | static int io_subchannel_chp_event(struct subchannel *sch, |
1133 | struct chp_link *link, int event) | |
c820de39 CH |
1134 | { |
1135 | int mask; | |
c820de39 | 1136 | |
99611f87 | 1137 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1138 | if (!mask) |
1139 | return 0; | |
1140 | switch (event) { | |
1141 | case CHP_VARY_OFF: | |
1142 | sch->opm &= ~mask; | |
1143 | sch->lpm &= ~mask; | |
1144 | io_subchannel_terminate_path(sch, mask); | |
1145 | break; | |
1146 | case CHP_VARY_ON: | |
1147 | sch->opm |= mask; | |
1148 | sch->lpm |= mask; | |
1149 | io_subchannel_verify(sch); | |
1150 | break; | |
1151 | case CHP_OFFLINE: | |
cdb912a4 | 1152 | if (cio_update_schib(sch)) |
c820de39 CH |
1153 | return -ENODEV; |
1154 | io_subchannel_terminate_path(sch, mask); | |
1155 | break; | |
1156 | case CHP_ONLINE: | |
cdb912a4 SO |
1157 | if (cio_update_schib(sch)) |
1158 | return -ENODEV; | |
c820de39 CH |
1159 | sch->lpm |= mask & sch->opm; |
1160 | io_subchannel_verify(sch); | |
1161 | break; | |
1162 | } | |
1163 | return 0; | |
1164 | } | |
1165 | ||
6e9a0f67 | 1166 | static void io_subchannel_quiesce(struct subchannel *sch) |
1da177e4 | 1167 | { |
1da177e4 LT |
1168 | struct ccw_device *cdev; |
1169 | int ret; | |
1170 | ||
56e6b796 | 1171 | spin_lock_irq(sch->lock); |
db6a6423 | 1172 | cdev = sch_get_cdev(sch); |
a8237fc4 | 1173 | if (cio_is_console(sch->schid)) |
56e6b796 | 1174 | goto out_unlock; |
1da177e4 | 1175 | if (!sch->schib.pmcw.ena) |
56e6b796 | 1176 | goto out_unlock; |
1da177e4 LT |
1177 | ret = cio_disable_subchannel(sch); |
1178 | if (ret != -EBUSY) | |
56e6b796 | 1179 | goto out_unlock; |
1da177e4 | 1180 | if (cdev->handler) |
56e6b796 SO |
1181 | cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO)); |
1182 | while (ret == -EBUSY) { | |
1183 | cdev->private->state = DEV_STATE_QUIESCE; | |
1184 | ret = ccw_device_cancel_halt_clear(cdev); | |
1185 | if (ret == -EBUSY) { | |
1186 | ccw_device_set_timeout(cdev, HZ/10); | |
1187 | spin_unlock_irq(sch->lock); | |
1188 | wait_event(cdev->private->wait_q, | |
1189 | cdev->private->state != DEV_STATE_QUIESCE); | |
1190 | spin_lock_irq(sch->lock); | |
1191 | } | |
1192 | ret = cio_disable_subchannel(sch); | |
1da177e4 | 1193 | } |
56e6b796 SO |
1194 | out_unlock: |
1195 | spin_unlock_irq(sch->lock); | |
1da177e4 LT |
1196 | } |
1197 | ||
6e9a0f67 SO |
1198 | static void io_subchannel_shutdown(struct subchannel *sch) |
1199 | { | |
1200 | io_subchannel_quiesce(sch); | |
1201 | } | |
1202 | ||
c820de39 CH |
1203 | static int device_is_disconnected(struct ccw_device *cdev) |
1204 | { | |
1205 | if (!cdev) | |
1206 | return 0; | |
1207 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1208 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1209 | } | |
1210 | ||
1211 | static int recovery_check(struct device *dev, void *data) | |
1212 | { | |
1213 | struct ccw_device *cdev = to_ccwdev(dev); | |
1214 | int *redo = data; | |
1215 | ||
1216 | spin_lock_irq(cdev->ccwlock); | |
1217 | switch (cdev->private->state) { | |
1218 | case DEV_STATE_DISCONNECTED: | |
1219 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1220 | cdev->private->dev_id.ssid, | |
1221 | cdev->private->dev_id.devno); | |
1222 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1223 | *redo = 1; | |
1224 | break; | |
1225 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1226 | *redo = 1; | |
1227 | break; | |
1228 | } | |
1229 | spin_unlock_irq(cdev->ccwlock); | |
1230 | ||
1231 | return 0; | |
1232 | } | |
1233 | ||
1234 | static void recovery_work_func(struct work_struct *unused) | |
1235 | { | |
1236 | int redo = 0; | |
1237 | ||
1238 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1239 | if (redo) { | |
1240 | spin_lock_irq(&recovery_lock); | |
1241 | if (!timer_pending(&recovery_timer)) { | |
1242 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1243 | recovery_phase++; | |
1244 | mod_timer(&recovery_timer, jiffies + | |
1245 | recovery_delay[recovery_phase] * HZ); | |
1246 | } | |
1247 | spin_unlock_irq(&recovery_lock); | |
1248 | } else | |
1249 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1250 | } | |
1251 | ||
1252 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1253 | ||
1254 | static void recovery_func(unsigned long data) | |
1255 | { | |
1256 | /* | |
1257 | * We can't do our recovery in softirq context and it's not | |
1258 | * performance critical, so we schedule it. | |
1259 | */ | |
1260 | schedule_work(&recovery_work); | |
1261 | } | |
1262 | ||
1263 | static void ccw_device_schedule_recovery(void) | |
1264 | { | |
1265 | unsigned long flags; | |
1266 | ||
1267 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1268 | spin_lock_irqsave(&recovery_lock, flags); | |
1269 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1270 | recovery_phase = 0; | |
1271 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1272 | } | |
1273 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1274 | } | |
1275 | ||
ecf5d9ef PO |
1276 | static int purge_fn(struct device *dev, void *data) |
1277 | { | |
1278 | struct ccw_device *cdev = to_ccwdev(dev); | |
37de53bb | 1279 | struct ccw_dev_id *id = &cdev->private->dev_id; |
ecf5d9ef PO |
1280 | |
1281 | spin_lock_irq(cdev->ccwlock); | |
37de53bb PO |
1282 | if (is_blacklisted(id->ssid, id->devno) && |
1283 | (cdev->private->state == DEV_STATE_OFFLINE)) { | |
1284 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid, | |
1285 | id->devno); | |
1286 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1287 | } | |
ecf5d9ef | 1288 | spin_unlock_irq(cdev->ccwlock); |
ecf5d9ef PO |
1289 | /* Abort loop in case of pending signal. */ |
1290 | if (signal_pending(current)) | |
1291 | return -EINTR; | |
1292 | ||
1293 | return 0; | |
1294 | } | |
1295 | ||
1296 | /** | |
1297 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1298 | * | |
1299 | * Unregister all ccw devices that are offline and on the blacklist. | |
1300 | */ | |
1301 | int ccw_purge_blacklisted(void) | |
1302 | { | |
1303 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1304 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1305 | return 0; | |
1306 | } | |
1307 | ||
6afcc775 | 1308 | void ccw_device_set_disconnected(struct ccw_device *cdev) |
c820de39 CH |
1309 | { |
1310 | if (!cdev) | |
1311 | return; | |
1312 | ccw_device_set_timeout(cdev, 0); | |
1313 | cdev->private->flags.fake_irb = 0; | |
1314 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1315 | if (cdev->online) | |
1316 | ccw_device_schedule_recovery(); | |
1317 | } | |
1318 | ||
91c36919 PO |
1319 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1320 | { | |
1321 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1322 | ||
1323 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1324 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1325 | ccw_device_set_timeout(cdev, 0); |
1326 | cio_disable_subchannel(sch); | |
1327 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1328 | } | |
1329 | ||
5d6e6b6f PO |
1330 | enum io_sch_action { |
1331 | IO_SCH_UNREG, | |
1332 | IO_SCH_ORPH_UNREG, | |
1333 | IO_SCH_ATTACH, | |
1334 | IO_SCH_UNREG_ATTACH, | |
1335 | IO_SCH_ORPH_ATTACH, | |
1336 | IO_SCH_REPROBE, | |
1337 | IO_SCH_VERIFY, | |
1338 | IO_SCH_DISC, | |
1339 | IO_SCH_NOP, | |
1340 | }; | |
1341 | ||
1342 | static enum io_sch_action sch_get_action(struct subchannel *sch) | |
1343 | { | |
1344 | struct ccw_device *cdev; | |
1345 | ||
1346 | cdev = sch_get_cdev(sch); | |
1347 | if (cio_update_schib(sch)) { | |
1348 | /* Not operational. */ | |
1349 | if (!cdev) | |
1350 | return IO_SCH_UNREG; | |
1351 | if (!ccw_device_notify(cdev, CIO_GONE)) | |
1352 | return IO_SCH_UNREG; | |
1353 | return IO_SCH_ORPH_UNREG; | |
1354 | } | |
1355 | /* Operational. */ | |
1356 | if (!cdev) | |
1357 | return IO_SCH_ATTACH; | |
1358 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1359 | if (!ccw_device_notify(cdev, CIO_GONE)) | |
1360 | return IO_SCH_UNREG_ATTACH; | |
1361 | return IO_SCH_ORPH_ATTACH; | |
1362 | } | |
1363 | if ((sch->schib.pmcw.pam & sch->opm) == 0) { | |
1364 | if (!ccw_device_notify(cdev, CIO_NO_PATH)) | |
1365 | return IO_SCH_UNREG; | |
1366 | return IO_SCH_DISC; | |
1367 | } | |
1368 | if (device_is_disconnected(cdev)) | |
1369 | return IO_SCH_REPROBE; | |
1370 | if (cdev->online) | |
1371 | return IO_SCH_VERIFY; | |
1372 | return IO_SCH_NOP; | |
1373 | } | |
1374 | ||
1375 | /** | |
1376 | * io_subchannel_sch_event - process subchannel event | |
1377 | * @sch: subchannel | |
1378 | * @process: non-zero if function is called in process context | |
1379 | * | |
1380 | * An unspecified event occurred for this subchannel. Adjust data according | |
1381 | * to the current operational state of the subchannel and device. Return | |
1382 | * zero when the event has been handled sufficiently or -EAGAIN when this | |
1383 | * function should be called again in process context. | |
1384 | */ | |
1385 | static int io_subchannel_sch_event(struct subchannel *sch, int process) | |
c820de39 | 1386 | { |
c820de39 | 1387 | unsigned long flags; |
c820de39 | 1388 | struct ccw_device *cdev; |
5d6e6b6f PO |
1389 | struct ccw_dev_id dev_id; |
1390 | enum io_sch_action action; | |
1391 | int rc = -EAGAIN; | |
c820de39 CH |
1392 | |
1393 | spin_lock_irqsave(sch->lock, flags); | |
5d6e6b6f PO |
1394 | if (!device_is_registered(&sch->dev)) |
1395 | goto out_unlock; | |
390935ac PO |
1396 | if (work_pending(&sch->todo_work)) |
1397 | goto out_unlock; | |
37de53bb PO |
1398 | cdev = sch_get_cdev(sch); |
1399 | if (cdev && work_pending(&cdev->private->todo_work)) | |
1400 | goto out_unlock; | |
5d6e6b6f PO |
1401 | action = sch_get_action(sch); |
1402 | CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", | |
1403 | sch->schid.ssid, sch->schid.sch_no, process, | |
1404 | action); | |
1405 | /* Perform immediate actions while holding the lock. */ | |
5d6e6b6f PO |
1406 | switch (action) { |
1407 | case IO_SCH_REPROBE: | |
1408 | /* Trigger device recognition. */ | |
1409 | ccw_device_trigger_reprobe(cdev); | |
1410 | rc = 0; | |
1411 | goto out_unlock; | |
1412 | case IO_SCH_VERIFY: | |
1413 | /* Trigger path verification. */ | |
1414 | io_subchannel_verify(sch); | |
1415 | rc = 0; | |
1416 | goto out_unlock; | |
1417 | case IO_SCH_DISC: | |
1418 | ccw_device_set_disconnected(cdev); | |
1419 | rc = 0; | |
1420 | goto out_unlock; | |
1421 | case IO_SCH_ORPH_UNREG: | |
1422 | case IO_SCH_ORPH_ATTACH: | |
1423 | ccw_device_set_disconnected(cdev); | |
1424 | break; | |
1425 | case IO_SCH_UNREG_ATTACH: | |
1426 | case IO_SCH_UNREG: | |
1427 | if (cdev) | |
1428 | ccw_device_set_notoper(cdev); | |
1429 | break; | |
1430 | case IO_SCH_NOP: | |
1431 | rc = 0; | |
1432 | goto out_unlock; | |
1433 | default: | |
1434 | break; | |
c820de39 | 1435 | } |
5d6e6b6f PO |
1436 | spin_unlock_irqrestore(sch->lock, flags); |
1437 | /* All other actions require process context. */ | |
1438 | if (!process) | |
1439 | goto out; | |
1440 | /* Handle attached ccw device. */ | |
1441 | switch (action) { | |
1442 | case IO_SCH_ORPH_UNREG: | |
1443 | case IO_SCH_ORPH_ATTACH: | |
1444 | /* Move ccw device to orphanage. */ | |
1445 | rc = ccw_device_move_to_orph(cdev); | |
1446 | if (rc) | |
1447 | goto out; | |
c820de39 | 1448 | break; |
5d6e6b6f PO |
1449 | case IO_SCH_UNREG_ATTACH: |
1450 | /* Unregister ccw device. */ | |
1451 | ccw_device_unregister(cdev); | |
c820de39 | 1452 | break; |
5d6e6b6f | 1453 | default: |
c820de39 CH |
1454 | break; |
1455 | } | |
5d6e6b6f | 1456 | /* Handle subchannel. */ |
c820de39 | 1457 | switch (action) { |
5d6e6b6f PO |
1458 | case IO_SCH_ORPH_UNREG: |
1459 | case IO_SCH_UNREG: | |
c820de39 | 1460 | css_sch_device_unregister(sch); |
c820de39 | 1461 | break; |
5d6e6b6f PO |
1462 | case IO_SCH_ORPH_ATTACH: |
1463 | case IO_SCH_UNREG_ATTACH: | |
1464 | case IO_SCH_ATTACH: | |
1465 | dev_id.ssid = sch->schid.ssid; | |
1466 | dev_id.devno = sch->schib.pmcw.dev; | |
1467 | cdev = get_ccwdev_by_dev_id(&dev_id); | |
1468 | if (!cdev) { | |
1469 | sch_create_and_recog_new_device(sch); | |
1470 | break; | |
1471 | } | |
1472 | rc = ccw_device_move_to_sch(cdev, sch); | |
1473 | if (rc) { | |
1474 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1475 | put_device(&cdev->dev); | |
1476 | goto out; | |
1477 | } | |
1478 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 | 1479 | ccw_device_trigger_reprobe(cdev); |
5d6e6b6f PO |
1480 | spin_unlock_irqrestore(sch->lock, flags); |
1481 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1482 | put_device(&cdev->dev); | |
91c36919 | 1483 | break; |
c820de39 CH |
1484 | default: |
1485 | break; | |
1486 | } | |
5d6e6b6f | 1487 | return 0; |
c820de39 | 1488 | |
5d6e6b6f PO |
1489 | out_unlock: |
1490 | spin_unlock_irqrestore(sch->lock, flags); | |
1491 | out: | |
1492 | return rc; | |
c820de39 CH |
1493 | } |
1494 | ||
1da177e4 LT |
1495 | #ifdef CONFIG_CCW_CONSOLE |
1496 | static struct ccw_device console_cdev; | |
1497 | static struct ccw_device_private console_private; | |
1498 | static int console_cdev_in_use; | |
1499 | ||
2ec22984 CH |
1500 | static DEFINE_SPINLOCK(ccw_console_lock); |
1501 | ||
1502 | spinlock_t * cio_get_console_lock(void) | |
1503 | { | |
1504 | return &ccw_console_lock; | |
1505 | } | |
1506 | ||
0ae7a7b2 CH |
1507 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1508 | struct subchannel *sch) | |
1da177e4 LT |
1509 | { |
1510 | int rc; | |
1511 | ||
cd6b4f27 CH |
1512 | /* Attach subchannel private data. */ |
1513 | sch->private = cio_get_console_priv(); | |
1514 | memset(sch->private, 0, sizeof(struct io_subchannel_private)); | |
0ae7a7b2 | 1515 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1516 | rc = cio_commit_config(sch); |
1517 | if (rc) | |
1518 | return rc; | |
0ae7a7b2 | 1519 | sch->driver = &io_subchannel_driver; |
1da177e4 | 1520 | /* Initialize the ccw_device structure. */ |
292888c8 | 1521 | cdev->dev.parent= &sch->dev; |
736b5db8 | 1522 | io_subchannel_recog(cdev, sch); |
1da177e4 LT |
1523 | /* Now wait for the async. recognition to come to an end. */ |
1524 | spin_lock_irq(cdev->ccwlock); | |
1525 | while (!dev_fsm_final_state(cdev)) | |
1526 | wait_cons_dev(); | |
1527 | rc = -EIO; | |
1528 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1529 | goto out_unlock; | |
1530 | ccw_device_online(cdev); | |
1531 | while (!dev_fsm_final_state(cdev)) | |
1532 | wait_cons_dev(); | |
1533 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1534 | goto out_unlock; | |
1535 | rc = 0; | |
1536 | out_unlock: | |
1537 | spin_unlock_irq(cdev->ccwlock); | |
736b5db8 | 1538 | return rc; |
1da177e4 LT |
1539 | } |
1540 | ||
1541 | struct ccw_device * | |
1542 | ccw_device_probe_console(void) | |
1543 | { | |
1544 | struct subchannel *sch; | |
1545 | int ret; | |
1546 | ||
1547 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1548 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1549 | sch = cio_probe_console(); |
1550 | if (IS_ERR(sch)) { | |
1551 | console_cdev_in_use = 0; | |
1552 | return (void *) sch; | |
1553 | } | |
1554 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1555 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1556 | console_cdev.private = &console_private; | |
c1637532 | 1557 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1558 | ret = ccw_device_console_enable(&console_cdev, sch); |
1559 | if (ret) { | |
1560 | cio_release_console(); | |
1561 | console_cdev_in_use = 0; | |
1562 | return ERR_PTR(ret); | |
1563 | } | |
1564 | console_cdev.online = 1; | |
1565 | return &console_cdev; | |
1566 | } | |
1f4e7eda | 1567 | |
6664845c MS |
1568 | static int ccw_device_pm_restore(struct device *dev); |
1569 | ||
1570 | int ccw_device_force_console(void) | |
1571 | { | |
1572 | if (!console_cdev_in_use) | |
1573 | return -ENODEV; | |
1574 | return ccw_device_pm_restore(&console_cdev.dev); | |
1575 | } | |
1576 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1577 | #endif |
1578 | ||
1579 | /* | |
1580 | * get ccw_device matching the busid, but only if owned by cdrv | |
1581 | */ | |
b0744bd2 CH |
1582 | static int |
1583 | __ccwdev_check_busid(struct device *dev, void *id) | |
1584 | { | |
1585 | char *bus_id; | |
1586 | ||
12975aef | 1587 | bus_id = id; |
b0744bd2 | 1588 | |
98df67b3 | 1589 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1590 | } |
1591 | ||
1592 | ||
b2ffd8e9 CH |
1593 | /** |
1594 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1595 | * @cdrv: driver the device is owned by | |
1596 | * @bus_id: bus id of the device to be searched | |
1597 | * | |
1598 | * This function searches all devices owned by @cdrv for a device with a bus | |
1599 | * id matching @bus_id. | |
1600 | * Returns: | |
1601 | * If a match is found, its reference count of the found device is increased | |
1602 | * and it is returned; else %NULL is returned. | |
1603 | */ | |
1604 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1605 | const char *bus_id) | |
1da177e4 | 1606 | { |
b0744bd2 | 1607 | struct device *dev; |
1da177e4 LT |
1608 | struct device_driver *drv; |
1609 | ||
1610 | drv = get_driver(&cdrv->driver); | |
1611 | if (!drv) | |
b0744bd2 | 1612 | return NULL; |
1da177e4 | 1613 | |
b0744bd2 CH |
1614 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1615 | __ccwdev_check_busid); | |
1da177e4 LT |
1616 | put_driver(drv); |
1617 | ||
d2c993d8 | 1618 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1619 | } |
1620 | ||
1621 | /************************** device driver handling ************************/ | |
1622 | ||
1623 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1624 | * and release methods are initially very similar to the device_driver | |
1625 | * implementations, with the difference that they have ccw_device | |
1626 | * arguments. | |
1627 | * | |
1628 | * A ccw driver also contains the information that is needed for | |
1629 | * device matching. | |
1630 | */ | |
1631 | static int | |
1632 | ccw_device_probe (struct device *dev) | |
1633 | { | |
1634 | struct ccw_device *cdev = to_ccwdev(dev); | |
1635 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1636 | int ret; | |
1637 | ||
1638 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1639 | ||
1640 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1641 | ||
1642 | if (ret) { | |
d2c993d8 | 1643 | cdev->drv = NULL; |
1da177e4 LT |
1644 | return ret; |
1645 | } | |
1646 | ||
1647 | return 0; | |
1648 | } | |
1649 | ||
1650 | static int | |
1651 | ccw_device_remove (struct device *dev) | |
1652 | { | |
1653 | struct ccw_device *cdev = to_ccwdev(dev); | |
1654 | struct ccw_driver *cdrv = cdev->drv; | |
1655 | int ret; | |
1656 | ||
1da177e4 LT |
1657 | if (cdrv->remove) |
1658 | cdrv->remove(cdev); | |
1659 | if (cdev->online) { | |
1660 | cdev->online = 0; | |
1661 | spin_lock_irq(cdev->ccwlock); | |
1662 | ret = ccw_device_offline(cdev); | |
1663 | spin_unlock_irq(cdev->ccwlock); | |
1664 | if (ret == 0) | |
1665 | wait_event(cdev->private->wait_q, | |
1666 | dev_fsm_final_state(cdev)); | |
1667 | else | |
139b83dd | 1668 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1669 | "device 0.%x.%04x\n", |
1670 | ret, cdev->private->dev_id.ssid, | |
1671 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1672 | /* Give up reference obtained in ccw_device_set_online(). */ |
1673 | put_device(&cdev->dev); | |
1da177e4 LT |
1674 | } |
1675 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1676 | cdev->drv = NULL; |
1da177e4 LT |
1677 | return 0; |
1678 | } | |
1679 | ||
958974fb CH |
1680 | static void ccw_device_shutdown(struct device *dev) |
1681 | { | |
1682 | struct ccw_device *cdev; | |
1683 | ||
1684 | cdev = to_ccwdev(dev); | |
1685 | if (cdev->drv && cdev->drv->shutdown) | |
1686 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1687 | disable_cmf(cdev); |
958974fb CH |
1688 | } |
1689 | ||
823d494a SO |
1690 | static int ccw_device_pm_prepare(struct device *dev) |
1691 | { | |
1692 | struct ccw_device *cdev = to_ccwdev(dev); | |
1693 | ||
37de53bb | 1694 | if (work_pending(&cdev->private->todo_work)) |
823d494a SO |
1695 | return -EAGAIN; |
1696 | /* Fail while device is being set online/offline. */ | |
1697 | if (atomic_read(&cdev->private->onoff)) | |
1698 | return -EAGAIN; | |
1699 | ||
1700 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1701 | return cdev->drv->prepare(cdev); | |
1702 | ||
1703 | return 0; | |
1704 | } | |
1705 | ||
1706 | static void ccw_device_pm_complete(struct device *dev) | |
1707 | { | |
1708 | struct ccw_device *cdev = to_ccwdev(dev); | |
1709 | ||
1710 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1711 | cdev->drv->complete(cdev); | |
1712 | } | |
1713 | ||
1714 | static int ccw_device_pm_freeze(struct device *dev) | |
1715 | { | |
1716 | struct ccw_device *cdev = to_ccwdev(dev); | |
1717 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1718 | int ret, cm_enabled; | |
1719 | ||
1720 | /* Fail suspend while device is in transistional state. */ | |
1721 | if (!dev_fsm_final_state(cdev)) | |
1722 | return -EAGAIN; | |
1723 | if (!cdev->online) | |
1724 | return 0; | |
1725 | if (cdev->drv && cdev->drv->freeze) { | |
1726 | ret = cdev->drv->freeze(cdev); | |
1727 | if (ret) | |
1728 | return ret; | |
1729 | } | |
1730 | ||
1731 | spin_lock_irq(sch->lock); | |
1732 | cm_enabled = cdev->private->cmb != NULL; | |
1733 | spin_unlock_irq(sch->lock); | |
1734 | if (cm_enabled) { | |
1735 | /* Don't have the css write on memory. */ | |
1736 | ret = ccw_set_cmf(cdev, 0); | |
1737 | if (ret) | |
1738 | return ret; | |
1739 | } | |
1740 | /* From here on, disallow device driver I/O. */ | |
1741 | spin_lock_irq(sch->lock); | |
1742 | ret = cio_disable_subchannel(sch); | |
1743 | spin_unlock_irq(sch->lock); | |
1744 | ||
1745 | return ret; | |
1746 | } | |
1747 | ||
1748 | static int ccw_device_pm_thaw(struct device *dev) | |
1749 | { | |
1750 | struct ccw_device *cdev = to_ccwdev(dev); | |
1751 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1752 | int ret, cm_enabled; | |
1753 | ||
1754 | if (!cdev->online) | |
1755 | return 0; | |
1756 | ||
1757 | spin_lock_irq(sch->lock); | |
1758 | /* Allow device driver I/O again. */ | |
1759 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1760 | cm_enabled = cdev->private->cmb != NULL; | |
1761 | spin_unlock_irq(sch->lock); | |
1762 | if (ret) | |
1763 | return ret; | |
1764 | ||
1765 | if (cm_enabled) { | |
1766 | ret = ccw_set_cmf(cdev, 1); | |
1767 | if (ret) | |
1768 | return ret; | |
1769 | } | |
1770 | ||
1771 | if (cdev->drv && cdev->drv->thaw) | |
1772 | ret = cdev->drv->thaw(cdev); | |
1773 | ||
1774 | return ret; | |
1775 | } | |
1776 | ||
1777 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
1778 | { | |
1779 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
823d494a SO |
1780 | |
1781 | if (cio_is_console(sch->schid)) | |
1782 | goto out; | |
1783 | /* | |
1784 | * While we were sleeping, devices may have gone or become | |
1785 | * available again. Kick re-detection. | |
1786 | */ | |
1787 | spin_lock_irq(sch->lock); | |
1788 | cdev->private->flags.resuming = 1; | |
736b5db8 | 1789 | ccw_device_recognition(cdev); |
823d494a | 1790 | spin_unlock_irq(sch->lock); |
823d494a SO |
1791 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || |
1792 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
823d494a SO |
1793 | out: |
1794 | cdev->private->flags.resuming = 0; | |
1795 | } | |
1796 | ||
1797 | static int resume_handle_boxed(struct ccw_device *cdev) | |
1798 | { | |
1799 | cdev->private->state = DEV_STATE_BOXED; | |
1800 | if (ccw_device_notify(cdev, CIO_BOXED)) | |
1801 | return 0; | |
37de53bb | 1802 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1803 | return -ENODEV; |
1804 | } | |
1805 | ||
1806 | static int resume_handle_disc(struct ccw_device *cdev) | |
1807 | { | |
1808 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1809 | if (ccw_device_notify(cdev, CIO_GONE)) | |
1810 | return 0; | |
37de53bb | 1811 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1812 | return -ENODEV; |
1813 | } | |
1814 | ||
1815 | static int ccw_device_pm_restore(struct device *dev) | |
1816 | { | |
1817 | struct ccw_device *cdev = to_ccwdev(dev); | |
1818 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1819 | int ret = 0, cm_enabled; | |
1820 | ||
1821 | __ccw_device_pm_restore(cdev); | |
1822 | spin_lock_irq(sch->lock); | |
1823 | if (cio_is_console(sch->schid)) { | |
1824 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1825 | spin_unlock_irq(sch->lock); | |
1826 | goto out_restore; | |
1827 | } | |
1828 | cdev->private->flags.donotify = 0; | |
1829 | /* check recognition results */ | |
1830 | switch (cdev->private->state) { | |
1831 | case DEV_STATE_OFFLINE: | |
1832 | break; | |
1833 | case DEV_STATE_BOXED: | |
1834 | ret = resume_handle_boxed(cdev); | |
1835 | spin_unlock_irq(sch->lock); | |
1836 | if (ret) | |
1837 | goto out; | |
1838 | goto out_restore; | |
1839 | case DEV_STATE_DISCONNECTED: | |
1840 | goto out_disc_unlock; | |
1841 | default: | |
1842 | goto out_unreg_unlock; | |
1843 | } | |
1844 | /* check if the device id has changed */ | |
1845 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
f014824e SO |
1846 | CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno " |
1847 | "changed from %04x to %04x)\n", | |
1848 | sch->schid.ssid, sch->schid.sch_no, | |
823d494a SO |
1849 | cdev->private->dev_id.devno, |
1850 | sch->schib.pmcw.dev); | |
1851 | goto out_unreg_unlock; | |
1852 | } | |
1853 | /* check if the device type has changed */ | |
1854 | if (!ccw_device_test_sense_data(cdev)) { | |
1855 | ccw_device_update_sense_data(cdev); | |
37de53bb | 1856 | ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); |
823d494a SO |
1857 | ret = -ENODEV; |
1858 | goto out_unlock; | |
1859 | } | |
1860 | if (!cdev->online) { | |
1861 | ret = 0; | |
1862 | goto out_unlock; | |
1863 | } | |
1864 | ret = ccw_device_online(cdev); | |
1865 | if (ret) | |
1866 | goto out_disc_unlock; | |
1867 | ||
1868 | cm_enabled = cdev->private->cmb != NULL; | |
1869 | spin_unlock_irq(sch->lock); | |
1870 | ||
1871 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1872 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
1873 | spin_lock_irq(sch->lock); | |
1874 | goto out_disc_unlock; | |
1875 | } | |
1876 | if (cm_enabled) { | |
1877 | ret = ccw_set_cmf(cdev, 1); | |
1878 | if (ret) { | |
f014824e SO |
1879 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
1880 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
1881 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
1882 | ret = 0; |
1883 | } | |
1884 | } | |
1885 | ||
1886 | out_restore: | |
1887 | if (cdev->online && cdev->drv && cdev->drv->restore) | |
1888 | ret = cdev->drv->restore(cdev); | |
1889 | out: | |
1890 | return ret; | |
1891 | ||
1892 | out_disc_unlock: | |
1893 | ret = resume_handle_disc(cdev); | |
1894 | spin_unlock_irq(sch->lock); | |
1895 | if (ret) | |
1896 | return ret; | |
1897 | goto out_restore; | |
1898 | ||
1899 | out_unreg_unlock: | |
37de53bb | 1900 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); |
823d494a SO |
1901 | ret = -ENODEV; |
1902 | out_unlock: | |
1903 | spin_unlock_irq(sch->lock); | |
1904 | return ret; | |
1905 | } | |
1906 | ||
47145210 | 1907 | static const struct dev_pm_ops ccw_pm_ops = { |
823d494a SO |
1908 | .prepare = ccw_device_pm_prepare, |
1909 | .complete = ccw_device_pm_complete, | |
1910 | .freeze = ccw_device_pm_freeze, | |
1911 | .thaw = ccw_device_pm_thaw, | |
1912 | .restore = ccw_device_pm_restore, | |
1913 | }; | |
1914 | ||
8bbace7e CH |
1915 | struct bus_type ccw_bus_type = { |
1916 | .name = "ccw", | |
1917 | .match = ccw_bus_match, | |
1918 | .uevent = ccw_uevent, | |
1919 | .probe = ccw_device_probe, | |
1920 | .remove = ccw_device_remove, | |
958974fb | 1921 | .shutdown = ccw_device_shutdown, |
823d494a | 1922 | .pm = &ccw_pm_ops, |
8bbace7e CH |
1923 | }; |
1924 | ||
b2ffd8e9 CH |
1925 | /** |
1926 | * ccw_driver_register() - register a ccw driver | |
1927 | * @cdriver: driver to be registered | |
1928 | * | |
1929 | * This function is mainly a wrapper around driver_register(). | |
1930 | * Returns: | |
1931 | * %0 on success and a negative error value on failure. | |
1932 | */ | |
1933 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
1934 | { |
1935 | struct device_driver *drv = &cdriver->driver; | |
1936 | ||
1937 | drv->bus = &ccw_bus_type; | |
1938 | drv->name = cdriver->name; | |
4beee646 | 1939 | drv->owner = cdriver->owner; |
1da177e4 LT |
1940 | |
1941 | return driver_register(drv); | |
1942 | } | |
1943 | ||
b2ffd8e9 CH |
1944 | /** |
1945 | * ccw_driver_unregister() - deregister a ccw driver | |
1946 | * @cdriver: driver to be deregistered | |
1947 | * | |
1948 | * This function is mainly a wrapper around driver_unregister(). | |
1949 | */ | |
1950 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
1951 | { |
1952 | driver_unregister(&cdriver->driver); | |
1953 | } | |
1954 | ||
a8237fc4 CH |
1955 | /* Helper func for qdio. */ |
1956 | struct subchannel_id | |
1957 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1958 | { | |
1959 | struct subchannel *sch; | |
1960 | ||
1961 | sch = to_subchannel(cdev->dev.parent); | |
1962 | return sch->schid; | |
1963 | } | |
1964 | ||
37de53bb PO |
1965 | static void ccw_device_todo(struct work_struct *work) |
1966 | { | |
1967 | struct ccw_device_private *priv; | |
1968 | struct ccw_device *cdev; | |
1969 | struct subchannel *sch; | |
1970 | enum cdev_todo todo; | |
1971 | ||
1972 | priv = container_of(work, struct ccw_device_private, todo_work); | |
1973 | cdev = priv->cdev; | |
1974 | sch = to_subchannel(cdev->dev.parent); | |
1975 | /* Find out todo. */ | |
1976 | spin_lock_irq(cdev->ccwlock); | |
1977 | todo = priv->todo; | |
1978 | priv->todo = CDEV_TODO_NOTHING; | |
1979 | CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n", | |
1980 | priv->dev_id.ssid, priv->dev_id.devno, todo); | |
1981 | spin_unlock_irq(cdev->ccwlock); | |
1982 | /* Perform todo. */ | |
1983 | switch (todo) { | |
1984 | case CDEV_TODO_ENABLE_CMF: | |
1985 | cmf_reenable(cdev); | |
1986 | break; | |
1987 | case CDEV_TODO_REBIND: | |
1988 | ccw_device_do_unbind_bind(cdev); | |
1989 | break; | |
1990 | case CDEV_TODO_REGISTER: | |
1991 | io_subchannel_register(cdev); | |
1992 | break; | |
1993 | case CDEV_TODO_UNREG_EVAL: | |
1994 | if (!sch_is_pseudo_sch(sch)) | |
1995 | css_schedule_eval(sch->schid); | |
1996 | /* fall-through */ | |
1997 | case CDEV_TODO_UNREG: | |
1998 | if (sch_is_pseudo_sch(sch)) | |
1999 | ccw_device_unregister(cdev); | |
2000 | else | |
2001 | ccw_device_call_sch_unregister(cdev); | |
2002 | break; | |
2003 | default: | |
2004 | break; | |
2005 | } | |
2006 | /* Release workqueue ref. */ | |
2007 | put_device(&cdev->dev); | |
2008 | } | |
2009 | ||
2010 | /** | |
2011 | * ccw_device_sched_todo - schedule ccw device operation | |
2012 | * @cdev: ccw device | |
2013 | * @todo: todo | |
2014 | * | |
2015 | * Schedule the operation identified by @todo to be performed on the slow path | |
2016 | * workqueue. Do nothing if another operation with higher priority is already | |
2017 | * scheduled. Needs to be called with ccwdev lock held. | |
2018 | */ | |
2019 | void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo) | |
2020 | { | |
2021 | CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n", | |
2022 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
2023 | todo); | |
2024 | if (cdev->private->todo >= todo) | |
2025 | return; | |
2026 | cdev->private->todo = todo; | |
2027 | /* Get workqueue ref. */ | |
2028 | if (!get_device(&cdev->dev)) | |
2029 | return; | |
2030 | if (!queue_work(slow_path_wq, &cdev->private->todo_work)) { | |
2031 | /* Already queued, release workqueue ref. */ | |
2032 | put_device(&cdev->dev); | |
2033 | } | |
2034 | } | |
2035 | ||
1da177e4 LT |
2036 | MODULE_LICENSE("GPL"); |
2037 | EXPORT_SYMBOL(ccw_device_set_online); | |
2038 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2039 | EXPORT_SYMBOL(ccw_driver_register); | |
2040 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2041 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
2042 | EXPORT_SYMBOL(ccw_bus_type); | |
2043 | EXPORT_SYMBOL(ccw_device_work); | |
a8237fc4 | 2044 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |