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Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 | 2 | * bus driver for ccw devices |
1da177e4 | 3 | * |
a53c8fab | 4 | * Copyright IBM Corp. 2002, 2008 |
1da177e4 | 5 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) |
4ce3b30c | 6 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
7 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
8 | */ | |
a7ae2c02 PO |
9 | |
10 | #define KMSG_COMPONENT "cio" | |
11 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
12 | ||
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/spinlock.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/workqueue.h> | |
90ab1336 | 22 | #include <linux/timer.h> |
de400d6b | 23 | #include <linux/kernel_stat.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 | ||
d5ab5276 | 130 | static 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 = { |
e6aed122 SO |
175 | .drv = { |
176 | .owner = THIS_MODULE, | |
177 | .name = "io_subchannel", | |
178 | }, | |
f08adc00 | 179 | .subchannel_type = io_subchannel_ids, |
1da177e4 | 180 | .irq = io_subchannel_irq, |
c820de39 CH |
181 | .sch_event = io_subchannel_sch_event, |
182 | .chp_event = io_subchannel_chp_event, | |
8bbace7e CH |
183 | .probe = io_subchannel_probe, |
184 | .remove = io_subchannel_remove, | |
185 | .shutdown = io_subchannel_shutdown, | |
93a27592 | 186 | .prepare = io_subchannel_prepare, |
8ea7f559 | 187 | .settle = io_subchannel_settle, |
1da177e4 LT |
188 | }; |
189 | ||
2f17644d | 190 | int __init io_subchannel_init(void) |
1da177e4 LT |
191 | { |
192 | int ret; | |
193 | ||
194 | init_waitqueue_head(&ccw_device_init_wq); | |
195 | atomic_set(&ccw_device_init_count, 0); | |
90ab1336 | 196 | setup_timer(&recovery_timer, recovery_func, 0); |
1da177e4 | 197 | |
be5d3823 SO |
198 | ret = bus_register(&ccw_bus_type); |
199 | if (ret) | |
200 | return ret; | |
25b7bb58 CH |
201 | ret = css_driver_register(&io_subchannel_driver); |
202 | if (ret) | |
be5d3823 | 203 | bus_unregister(&ccw_bus_type); |
1da177e4 | 204 | |
1da177e4 LT |
205 | return ret; |
206 | } | |
207 | ||
1da177e4 LT |
208 | |
209 | /************************ device handling **************************/ | |
210 | ||
211 | /* | |
212 | * A ccw_device has some interfaces in sysfs in addition to the | |
213 | * standard ones. | |
214 | * The following entries are designed to export the information which | |
215 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
216 | * are obvious, so they don't have an entry :) | |
217 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
218 | */ | |
219 | static ssize_t | |
3fd3c0a5 | 220 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
221 | { |
222 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 223 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
224 | ssize_t ret = 0; |
225 | int chp; | |
7ad6a249 PO |
226 | int mask; |
227 | ||
228 | for (chp = 0; chp < 8; chp++) { | |
229 | mask = 0x80 >> chp; | |
230 | if (ssd->path_mask & mask) | |
231 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
232 | else | |
233 | ret += sprintf(buf + ret, "00 "); | |
234 | } | |
1da177e4 LT |
235 | ret += sprintf (buf+ret, "\n"); |
236 | return min((ssize_t)PAGE_SIZE, ret); | |
237 | } | |
238 | ||
239 | static ssize_t | |
3fd3c0a5 | 240 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
241 | { |
242 | struct subchannel *sch = to_subchannel(dev); | |
243 | struct pmcw *pmcw = &sch->schib.pmcw; | |
244 | ||
245 | return sprintf (buf, "%02x %02x %02x\n", | |
246 | pmcw->pim, pmcw->pam, pmcw->pom); | |
247 | } | |
248 | ||
249 | static ssize_t | |
3fd3c0a5 | 250 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
251 | { |
252 | struct ccw_device *cdev = to_ccwdev(dev); | |
253 | struct ccw_device_id *id = &(cdev->id); | |
254 | ||
255 | if (id->dev_type != 0) | |
256 | return sprintf(buf, "%04x/%02x\n", | |
257 | id->dev_type, id->dev_model); | |
258 | else | |
259 | return sprintf(buf, "n/a\n"); | |
260 | } | |
261 | ||
262 | static ssize_t | |
3fd3c0a5 | 263 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
264 | { |
265 | struct ccw_device *cdev = to_ccwdev(dev); | |
266 | struct ccw_device_id *id = &(cdev->id); | |
267 | ||
268 | return sprintf(buf, "%04x/%02x\n", | |
269 | id->cu_type, id->cu_model); | |
270 | } | |
271 | ||
f1fc78a8 BB |
272 | static ssize_t |
273 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
274 | { | |
275 | struct ccw_device *cdev = to_ccwdev(dev); | |
276 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 277 | int len; |
f1fc78a8 | 278 | |
086a6c62 | 279 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
280 | |
281 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
282 | } |
283 | ||
1da177e4 | 284 | static ssize_t |
3fd3c0a5 | 285 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
286 | { |
287 | struct ccw_device *cdev = to_ccwdev(dev); | |
288 | ||
289 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
290 | } | |
291 | ||
d7b5a4c9 CH |
292 | int ccw_device_is_orphan(struct ccw_device *cdev) |
293 | { | |
294 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
295 | } | |
296 | ||
ef99516c | 297 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 298 | { |
7d253b9a | 299 | if (device_is_registered(&cdev->dev)) { |
24a1872d | 300 | /* Undo device_add(). */ |
ef99516c | 301 | device_del(&cdev->dev); |
24a1872d SO |
302 | } |
303 | if (cdev->private->flags.initialized) { | |
304 | cdev->private->flags.initialized = 0; | |
3b554a14 SO |
305 | /* Release reference from device_initialize(). */ |
306 | put_device(&cdev->dev); | |
307 | } | |
7674da77 CH |
308 | } |
309 | ||
d40f7b75 SO |
310 | static void io_subchannel_quiesce(struct subchannel *); |
311 | ||
b2ffd8e9 CH |
312 | /** |
313 | * ccw_device_set_offline() - disable a ccw device for I/O | |
314 | * @cdev: target ccw device | |
315 | * | |
316 | * This function calls the driver's set_offline() function for @cdev, if | |
317 | * given, and then disables @cdev. | |
318 | * Returns: | |
319 | * %0 on success and a negative error value on failure. | |
320 | * Context: | |
321 | * enabled, ccw device lock not held | |
322 | */ | |
323 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 | 324 | { |
d40f7b75 SO |
325 | struct subchannel *sch; |
326 | int ret, state; | |
1da177e4 LT |
327 | |
328 | if (!cdev) | |
329 | return -ENODEV; | |
330 | if (!cdev->online || !cdev->drv) | |
331 | return -EINVAL; | |
332 | ||
333 | if (cdev->drv->set_offline) { | |
334 | ret = cdev->drv->set_offline(cdev); | |
335 | if (ret != 0) | |
336 | return ret; | |
337 | } | |
338 | cdev->online = 0; | |
339 | spin_lock_irq(cdev->ccwlock); | |
d40f7b75 | 340 | sch = to_subchannel(cdev->dev.parent); |
217ee6c6 ME |
341 | /* Wait until a final state or DISCONNECTED is reached */ |
342 | while (!dev_fsm_final_state(cdev) && | |
343 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
1da177e4 | 344 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
345 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
346 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
347 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 | 348 | } |
d40f7b75 SO |
349 | do { |
350 | ret = ccw_device_offline(cdev); | |
351 | if (!ret) | |
352 | break; | |
353 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device " | |
354 | "0.%x.%04x\n", ret, cdev->private->dev_id.ssid, | |
355 | cdev->private->dev_id.devno); | |
356 | if (ret != -EBUSY) | |
357 | goto error; | |
358 | state = cdev->private->state; | |
359 | spin_unlock_irq(cdev->ccwlock); | |
360 | io_subchannel_quiesce(sch); | |
361 | spin_lock_irq(cdev->ccwlock); | |
362 | cdev->private->state = state; | |
363 | } while (ret == -EBUSY); | |
1da177e4 | 364 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
365 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
366 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
a7ae2c02 PO |
367 | /* Inform the user if set offline failed. */ |
368 | if (cdev->private->state == DEV_STATE_BOXED) { | |
369 | pr_warning("%s: The device entered boxed state while " | |
370 | "being set offline\n", dev_name(&cdev->dev)); | |
371 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
372 | pr_warning("%s: The device stopped operating while " | |
373 | "being set offline\n", dev_name(&cdev->dev)); | |
374 | } | |
217ee6c6 ME |
375 | /* Give up reference from ccw_device_set_online(). */ |
376 | put_device(&cdev->dev); | |
377 | return 0; | |
378 | ||
379 | error: | |
217ee6c6 ME |
380 | cdev->private->state = DEV_STATE_OFFLINE; |
381 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
382 | spin_unlock_irq(cdev->ccwlock); | |
383 | /* Give up reference from ccw_device_set_online(). */ | |
384 | put_device(&cdev->dev); | |
385 | return -ENODEV; | |
1da177e4 LT |
386 | } |
387 | ||
b2ffd8e9 CH |
388 | /** |
389 | * ccw_device_set_online() - enable a ccw device for I/O | |
390 | * @cdev: target ccw device | |
391 | * | |
392 | * This function first enables @cdev and then calls the driver's set_online() | |
393 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
394 | * disabled again. | |
395 | * Returns: | |
396 | * %0 on success and a negative error value on failure. | |
397 | * Context: | |
398 | * enabled, ccw device lock not held | |
399 | */ | |
400 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
401 | { |
402 | int ret; | |
217ee6c6 | 403 | int ret2; |
1da177e4 LT |
404 | |
405 | if (!cdev) | |
406 | return -ENODEV; | |
407 | if (cdev->online || !cdev->drv) | |
408 | return -EINVAL; | |
9cd67421 CH |
409 | /* Hold on to an extra reference while device is online. */ |
410 | if (!get_device(&cdev->dev)) | |
411 | return -ENODEV; | |
1da177e4 LT |
412 | |
413 | spin_lock_irq(cdev->ccwlock); | |
414 | ret = ccw_device_online(cdev); | |
415 | spin_unlock_irq(cdev->ccwlock); | |
416 | if (ret == 0) | |
417 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
418 | else { | |
139b83dd | 419 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
420 | "device 0.%x.%04x\n", |
421 | ret, cdev->private->dev_id.ssid, | |
422 | cdev->private->dev_id.devno); | |
9cd67421 CH |
423 | /* Give up online reference since onlining failed. */ |
424 | put_device(&cdev->dev); | |
1da177e4 LT |
425 | return ret; |
426 | } | |
217ee6c6 ME |
427 | spin_lock_irq(cdev->ccwlock); |
428 | /* Check if online processing was successful */ | |
429 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
430 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
431 | spin_unlock_irq(cdev->ccwlock); | |
a7ae2c02 PO |
432 | /* Inform the user that set online failed. */ |
433 | if (cdev->private->state == DEV_STATE_BOXED) { | |
434 | pr_warning("%s: Setting the device online failed " | |
435 | "because it is boxed\n", | |
436 | dev_name(&cdev->dev)); | |
437 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
438 | pr_warning("%s: Setting the device online failed " | |
439 | "because it is not operational\n", | |
440 | dev_name(&cdev->dev)); | |
441 | } | |
9cd67421 CH |
442 | /* Give up online reference since onlining failed. */ |
443 | put_device(&cdev->dev); | |
1da177e4 | 444 | return -ENODEV; |
9cd67421 | 445 | } |
217ee6c6 ME |
446 | spin_unlock_irq(cdev->ccwlock); |
447 | if (cdev->drv->set_online) | |
448 | ret = cdev->drv->set_online(cdev); | |
449 | if (ret) | |
450 | goto rollback; | |
451 | cdev->online = 1; | |
452 | return 0; | |
453 | ||
454 | rollback: | |
1da177e4 | 455 | spin_lock_irq(cdev->ccwlock); |
217ee6c6 ME |
456 | /* Wait until a final state or DISCONNECTED is reached */ |
457 | while (!dev_fsm_final_state(cdev) && | |
458 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
459 | spin_unlock_irq(cdev->ccwlock); | |
460 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
461 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
462 | spin_lock_irq(cdev->ccwlock); | |
463 | } | |
464 | ret2 = ccw_device_offline(cdev); | |
465 | if (ret2) | |
466 | goto error; | |
467 | spin_unlock_irq(cdev->ccwlock); | |
468 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
469 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
470 | /* Give up online reference since onlining failed. */ | |
471 | put_device(&cdev->dev); | |
472 | return ret; | |
473 | ||
474 | error: | |
475 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
476 | "device 0.%x.%04x\n", | |
477 | ret2, cdev->private->dev_id.ssid, | |
478 | cdev->private->dev_id.devno); | |
479 | cdev->private->state = DEV_STATE_OFFLINE; | |
1da177e4 | 480 | spin_unlock_irq(cdev->ccwlock); |
9cd67421 CH |
481 | /* Give up online reference since onlining failed. */ |
482 | put_device(&cdev->dev); | |
217ee6c6 | 483 | return ret; |
1da177e4 LT |
484 | } |
485 | ||
e74fe0ce | 486 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 | 487 | { |
37de53bb PO |
488 | if (cdev->private->state == DEV_STATE_DISCONNECTED) { |
489 | spin_lock_irq(cdev->ccwlock); | |
490 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); | |
491 | spin_unlock_irq(cdev->ccwlock); | |
7cd40314 SO |
492 | return 0; |
493 | } | |
494 | if (cdev->drv && cdev->drv->set_offline) | |
e74fe0ce | 495 | return ccw_device_set_offline(cdev); |
7cd40314 | 496 | return -EINVAL; |
f5ba6c86 CH |
497 | } |
498 | ||
499 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
500 | { | |
f5ba6c86 | 501 | /* Do device recognition, if needed. */ |
99f6a570 | 502 | if (cdev->private->state == DEV_STATE_BOXED) { |
1f5bd384 | 503 | spin_lock_irq(cdev->ccwlock); |
736b5db8 | 504 | ccw_device_recognition(cdev); |
1f5bd384 | 505 | spin_unlock_irq(cdev->ccwlock); |
f5ba6c86 CH |
506 | wait_event(cdev->private->wait_q, |
507 | cdev->private->flags.recog_done); | |
156013ff SO |
508 | if (cdev->private->state != DEV_STATE_OFFLINE) |
509 | /* recognition failed */ | |
510 | return -EAGAIN; | |
f5ba6c86 CH |
511 | } |
512 | if (cdev->drv && cdev->drv->set_online) | |
7cd40314 SO |
513 | return ccw_device_set_online(cdev); |
514 | return -EINVAL; | |
f5ba6c86 | 515 | } |
156013ff | 516 | |
c78aa6cb | 517 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
518 | { |
519 | int ret; | |
520 | ||
521 | ret = online_store_recog_and_online(cdev); | |
156013ff | 522 | if (ret && !force) |
c78aa6cb | 523 | return ret; |
f5ba6c86 CH |
524 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
525 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
526 | if (ret) |
527 | return ret; | |
f5ba6c86 CH |
528 | if (cdev->id.cu_type == 0) |
529 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
530 | ret = online_store_recog_and_online(cdev); |
531 | if (ret) | |
532 | return ret; | |
f5ba6c86 | 533 | } |
c78aa6cb | 534 | return 0; |
f5ba6c86 CH |
535 | } |
536 | ||
537 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
538 | const char *buf, size_t count) | |
1da177e4 LT |
539 | { |
540 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
541 | int force, ret; |
542 | unsigned long i; | |
1da177e4 | 543 | |
a2fc8485 | 544 | /* Prevent conflict between multiple on-/offline processing requests. */ |
350e9120 | 545 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
1da177e4 | 546 | return -EAGAIN; |
a2fc8485 PO |
547 | /* Prevent conflict between internal I/Os and on-/offline processing. */ |
548 | if (!dev_fsm_final_state(cdev) && | |
549 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
550 | ret = -EAGAIN; | |
551 | goto out_onoff; | |
552 | } | |
553 | /* Prevent conflict between pending work and on-/offline processing.*/ | |
554 | if (work_pending(&cdev->private->todo_work)) { | |
555 | ret = -EAGAIN; | |
556 | goto out_onoff; | |
557 | } | |
1da177e4 | 558 | |
3bda058b | 559 | if (cdev->drv && !try_module_get(cdev->drv->driver.owner)) { |
a2fc8485 PO |
560 | ret = -EINVAL; |
561 | goto out_onoff; | |
1da177e4 LT |
562 | } |
563 | if (!strncmp(buf, "force\n", count)) { | |
564 | force = 1; | |
565 | i = 1; | |
2f972202 | 566 | ret = 0; |
1da177e4 LT |
567 | } else { |
568 | force = 0; | |
2f972202 | 569 | ret = strict_strtoul(buf, 16, &i); |
1da177e4 | 570 | } |
2f972202 CH |
571 | if (ret) |
572 | goto out; | |
f5ba6c86 CH |
573 | switch (i) { |
574 | case 0: | |
e74fe0ce | 575 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
576 | break; |
577 | case 1: | |
c78aa6cb | 578 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
579 | break; |
580 | default: | |
2f972202 | 581 | ret = -EINVAL; |
1da177e4 | 582 | } |
2f972202 | 583 | out: |
1da177e4 | 584 | if (cdev->drv) |
3bda058b | 585 | module_put(cdev->drv->driver.owner); |
a2fc8485 | 586 | out_onoff: |
1da177e4 | 587 | atomic_set(&cdev->private->onoff, 0); |
e74fe0ce | 588 | return (ret < 0) ? ret : count; |
1da177e4 LT |
589 | } |
590 | ||
591 | static ssize_t | |
3fd3c0a5 | 592 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
593 | { |
594 | struct ccw_device *cdev = to_ccwdev(dev); | |
595 | struct subchannel *sch; | |
596 | ||
d7b5a4c9 CH |
597 | if (ccw_device_is_orphan(cdev)) |
598 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
599 | switch (cdev->private->state) { |
600 | case DEV_STATE_BOXED: | |
601 | return sprintf(buf, "boxed\n"); | |
602 | case DEV_STATE_DISCONNECTED: | |
603 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
604 | case DEV_STATE_NOT_OPER: | |
605 | sch = to_subchannel(dev->parent); | |
606 | if (!sch->lpm) | |
607 | return sprintf(buf, "no path\n"); | |
608 | else | |
609 | return sprintf(buf, "no device\n"); | |
610 | default: | |
611 | /* All other states considered fine. */ | |
612 | return sprintf(buf, "good\n"); | |
613 | } | |
614 | } | |
615 | ||
fd0457a6 ME |
616 | static ssize_t |
617 | initiate_logging(struct device *dev, struct device_attribute *attr, | |
618 | const char *buf, size_t count) | |
619 | { | |
620 | struct subchannel *sch = to_subchannel(dev); | |
621 | int rc; | |
622 | ||
623 | rc = chsc_siosl(sch->schid); | |
624 | if (rc < 0) { | |
625 | pr_warning("Logging for subchannel 0.%x.%04x failed with " | |
626 | "errno=%d\n", | |
627 | sch->schid.ssid, sch->schid.sch_no, rc); | |
628 | return rc; | |
629 | } | |
630 | pr_notice("Logging for subchannel 0.%x.%04x was triggered\n", | |
631 | sch->schid.ssid, sch->schid.sch_no); | |
632 | return count; | |
633 | } | |
634 | ||
1da177e4 LT |
635 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); |
636 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
637 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
638 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 639 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 640 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 | 641 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
fd0457a6 | 642 | static DEVICE_ATTR(logging, 0200, NULL, initiate_logging); |
1da177e4 | 643 | |
7e9db9ea | 644 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
645 | &dev_attr_chpids.attr, |
646 | &dev_attr_pimpampom.attr, | |
fd0457a6 | 647 | &dev_attr_logging.attr, |
1da177e4 LT |
648 | NULL, |
649 | }; | |
650 | ||
7e9db9ea CH |
651 | static struct attribute_group io_subchannel_attr_group = { |
652 | .attrs = io_subchannel_attrs, | |
529192f3 | 653 | }; |
1da177e4 LT |
654 | |
655 | static struct attribute * ccwdev_attrs[] = { | |
656 | &dev_attr_devtype.attr, | |
657 | &dev_attr_cutype.attr, | |
f1fc78a8 | 658 | &dev_attr_modalias.attr, |
1da177e4 LT |
659 | &dev_attr_online.attr, |
660 | &dev_attr_cmb_enable.attr, | |
661 | &dev_attr_availability.attr, | |
662 | NULL, | |
663 | }; | |
664 | ||
665 | static struct attribute_group ccwdev_attr_group = { | |
666 | .attrs = ccwdev_attrs, | |
667 | }; | |
668 | ||
a4dbd674 | 669 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
670 | &ccwdev_attr_group, |
671 | NULL, | |
672 | }; | |
1da177e4 LT |
673 | |
674 | /* this is a simple abstraction for device_register that sets the | |
675 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 676 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
677 | { |
678 | struct device *dev = &cdev->dev; | |
679 | int ret; | |
680 | ||
681 | dev->bus = &ccw_bus_type; | |
3ac276f8 SO |
682 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
683 | cdev->private->dev_id.devno); | |
684 | if (ret) | |
685 | return ret; | |
7d253b9a | 686 | return device_add(dev); |
1da177e4 LT |
687 | } |
688 | ||
5d6e6b6f | 689 | static int match_dev_id(struct device *dev, void *data) |
b0744bd2 | 690 | { |
5d6e6b6f PO |
691 | struct ccw_device *cdev = to_ccwdev(dev); |
692 | struct ccw_dev_id *dev_id = data; | |
d7b5a4c9 | 693 | |
d7b5a4c9 CH |
694 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); |
695 | } | |
696 | ||
b7a610f7 SO |
697 | /** |
698 | * get_ccwdev_by_dev_id() - obtain device from a ccw device id | |
699 | * @dev_id: id of the device to be searched | |
700 | * | |
701 | * This function searches all devices attached to the ccw bus for a device | |
702 | * matching @dev_id. | |
703 | * Returns: | |
704 | * If a device is found its reference count is increased and returned; | |
705 | * else %NULL is returned. | |
706 | */ | |
707 | struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id) | |
d7b5a4c9 CH |
708 | { |
709 | struct device *dev; | |
710 | ||
5d6e6b6f | 711 | dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id); |
d7b5a4c9 CH |
712 | |
713 | return dev ? to_ccwdev(dev) : NULL; | |
714 | } | |
b7a610f7 | 715 | EXPORT_SYMBOL_GPL(get_ccwdev_by_dev_id); |
d7b5a4c9 | 716 | |
37de53bb | 717 | static void ccw_device_do_unbind_bind(struct ccw_device *cdev) |
1da177e4 | 718 | { |
eb32ae8d | 719 | int ret; |
1da177e4 | 720 | |
7d253b9a | 721 | if (device_is_registered(&cdev->dev)) { |
eb32ae8d CH |
722 | device_release_driver(&cdev->dev); |
723 | ret = device_attach(&cdev->dev); | |
724 | WARN_ON(ret == -ENODEV); | |
725 | } | |
1da177e4 LT |
726 | } |
727 | ||
728 | static void | |
729 | ccw_device_release(struct device *dev) | |
730 | { | |
731 | struct ccw_device *cdev; | |
732 | ||
733 | cdev = to_ccwdev(dev); | |
6eff208f CH |
734 | /* Release reference of parent subchannel. */ |
735 | put_device(cdev->dev.parent); | |
1da177e4 LT |
736 | kfree(cdev->private); |
737 | kfree(cdev); | |
738 | } | |
739 | ||
7674da77 CH |
740 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
741 | { | |
742 | struct ccw_device *cdev; | |
743 | ||
744 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
745 | if (cdev) { | |
746 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
747 | GFP_KERNEL | GFP_DMA); | |
748 | if (cdev->private) | |
749 | return cdev; | |
750 | } | |
751 | kfree(cdev); | |
752 | return ERR_PTR(-ENOMEM); | |
753 | } | |
754 | ||
37de53bb PO |
755 | static void ccw_device_todo(struct work_struct *work); |
756 | ||
7674da77 CH |
757 | static int io_subchannel_initialize_dev(struct subchannel *sch, |
758 | struct ccw_device *cdev) | |
759 | { | |
760 | cdev->private->cdev = cdev; | |
420f42ec | 761 | cdev->private->int_class = IRQIO_CIO; |
7674da77 CH |
762 | atomic_set(&cdev->private->onoff, 0); |
763 | cdev->dev.parent = &sch->dev; | |
764 | cdev->dev.release = ccw_device_release; | |
37de53bb | 765 | INIT_WORK(&cdev->private->todo_work, ccw_device_todo); |
ef99516c | 766 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
767 | /* Do first half of device_register. */ |
768 | device_initialize(&cdev->dev); | |
769 | if (!get_device(&sch->dev)) { | |
283fdd0b CH |
770 | /* Release reference from device_initialize(). */ |
771 | put_device(&cdev->dev); | |
7674da77 CH |
772 | return -ENODEV; |
773 | } | |
24a1872d | 774 | cdev->private->flags.initialized = 1; |
7674da77 CH |
775 | return 0; |
776 | } | |
777 | ||
778 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
779 | { | |
780 | struct ccw_device *cdev; | |
781 | int ret; | |
782 | ||
783 | cdev = io_subchannel_allocate_dev(sch); | |
784 | if (!IS_ERR(cdev)) { | |
785 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 786 | if (ret) |
7674da77 | 787 | cdev = ERR_PTR(ret); |
7674da77 CH |
788 | } |
789 | return cdev; | |
790 | } | |
791 | ||
736b5db8 | 792 | static void io_subchannel_recog(struct ccw_device *, struct subchannel *); |
d7b5a4c9 | 793 | |
d7b5a4c9 CH |
794 | static void sch_create_and_recog_new_device(struct subchannel *sch) |
795 | { | |
796 | struct ccw_device *cdev; | |
797 | ||
798 | /* Need to allocate a new ccw device. */ | |
799 | cdev = io_subchannel_create_ccwdev(sch); | |
800 | if (IS_ERR(cdev)) { | |
801 | /* OK, we did everything we could... */ | |
802 | css_sch_device_unregister(sch); | |
803 | return; | |
804 | } | |
d7b5a4c9 | 805 | /* Start recognition for the new ccw device. */ |
736b5db8 | 806 | io_subchannel_recog(cdev, sch); |
d7b5a4c9 CH |
807 | } |
808 | ||
1da177e4 LT |
809 | /* |
810 | * Register recognized device. | |
811 | */ | |
37de53bb | 812 | static void io_subchannel_register(struct ccw_device *cdev) |
1da177e4 | 813 | { |
1da177e4 | 814 | struct subchannel *sch; |
a290156f | 815 | int ret, adjust_init_count = 1; |
1da177e4 LT |
816 | unsigned long flags; |
817 | ||
1da177e4 | 818 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
819 | /* |
820 | * Check if subchannel is still registered. It may have become | |
821 | * unregistered if a machine check hit us after finishing | |
822 | * device recognition but before the register work could be | |
823 | * queued. | |
824 | */ | |
825 | if (!device_is_registered(&sch->dev)) | |
826 | goto out_err; | |
82b7ac05 | 827 | css_update_ssd_info(sch); |
47af5518 CH |
828 | /* |
829 | * io_subchannel_register() will also be called after device | |
830 | * recognition has been done for a boxed device (which will already | |
831 | * be registered). We need to reprobe since we may now have sense id | |
832 | * information. | |
833 | */ | |
d6a30761 | 834 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
835 | if (!cdev->drv) { |
836 | ret = device_reprobe(&cdev->dev); | |
837 | if (ret) | |
838 | /* We can't do much here. */ | |
139b83dd | 839 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
840 | " %d for 0.%x.%04x\n", ret, |
841 | cdev->private->dev_id.ssid, | |
842 | cdev->private->dev_id.devno); | |
47af5518 | 843 | } |
a290156f | 844 | adjust_init_count = 0; |
1da177e4 LT |
845 | goto out; |
846 | } | |
fa1a8c23 CH |
847 | /* |
848 | * Now we know this subchannel will stay, we can throw | |
849 | * our delayed uevent. | |
850 | */ | |
f67f129e | 851 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 852 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 LT |
853 | /* make it known to the system */ |
854 | ret = ccw_device_register(cdev); | |
855 | if (ret) { | |
e556bbbd CH |
856 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
857 | cdev->private->dev_id.ssid, | |
858 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 859 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 860 | sch_set_cdev(sch, NULL); |
2ec22984 | 861 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
862 | /* Release initial device reference. */ |
863 | put_device(&cdev->dev); | |
5fb6b854 | 864 | goto out_err; |
1da177e4 | 865 | } |
1da177e4 LT |
866 | out: |
867 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 868 | wake_up(&cdev->private->wait_q); |
5fb6b854 | 869 | out_err: |
a290156f | 870 | if (adjust_init_count && atomic_dec_and_test(&ccw_device_init_count)) |
1da177e4 LT |
871 | wake_up(&ccw_device_init_wq); |
872 | } | |
873 | ||
37de53bb | 874 | static void ccw_device_call_sch_unregister(struct ccw_device *cdev) |
1da177e4 | 875 | { |
1da177e4 LT |
876 | struct subchannel *sch; |
877 | ||
46fbe4e4 PO |
878 | /* Get subchannel reference for local processing. */ |
879 | if (!get_device(cdev->dev.parent)) | |
880 | return; | |
1da177e4 | 881 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 882 | css_sch_device_unregister(sch); |
46fbe4e4 | 883 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
884 | put_device(&sch->dev); |
885 | } | |
886 | ||
887 | /* | |
888 | * subchannel recognition done. Called from the state machine. | |
889 | */ | |
890 | void | |
891 | io_subchannel_recog_done(struct ccw_device *cdev) | |
892 | { | |
1da177e4 LT |
893 | if (css_init_done == 0) { |
894 | cdev->private->flags.recog_done = 1; | |
895 | return; | |
896 | } | |
897 | switch (cdev->private->state) { | |
47593bfa SO |
898 | case DEV_STATE_BOXED: |
899 | /* Device did not respond in time. */ | |
1da177e4 LT |
900 | case DEV_STATE_NOT_OPER: |
901 | cdev->private->flags.recog_done = 1; | |
37de53bb PO |
902 | /* Remove device found not operational. */ |
903 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1da177e4 LT |
904 | if (atomic_dec_and_test(&ccw_device_init_count)) |
905 | wake_up(&ccw_device_init_wq); | |
906 | break; | |
1da177e4 LT |
907 | case DEV_STATE_OFFLINE: |
908 | /* | |
909 | * We can't register the device in interrupt context so | |
910 | * we schedule a work item. | |
911 | */ | |
37de53bb | 912 | ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER); |
1da177e4 LT |
913 | break; |
914 | } | |
915 | } | |
916 | ||
736b5db8 | 917 | static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) |
1da177e4 | 918 | { |
1da177e4 LT |
919 | struct ccw_device_private *priv; |
920 | ||
2ec22984 | 921 | cdev->ccwlock = sch->lock; |
fb6958a5 | 922 | |
1da177e4 LT |
923 | /* Init private data. */ |
924 | priv = cdev->private; | |
78964268 CH |
925 | priv->dev_id.devno = sch->schib.pmcw.dev; |
926 | priv->dev_id.ssid = sch->schid.ssid; | |
927 | priv->schid = sch->schid; | |
1da177e4 LT |
928 | priv->state = DEV_STATE_NOT_OPER; |
929 | INIT_LIST_HEAD(&priv->cmb_list); | |
930 | init_waitqueue_head(&priv->wait_q); | |
931 | init_timer(&priv->timer); | |
932 | ||
1da177e4 LT |
933 | /* Increase counter of devices currently in recognition. */ |
934 | atomic_inc(&ccw_device_init_count); | |
935 | ||
936 | /* Start async. device sensing. */ | |
2ec22984 | 937 | spin_lock_irq(sch->lock); |
60e4dac1 | 938 | sch_set_cdev(sch, cdev); |
736b5db8 | 939 | ccw_device_recognition(cdev); |
2ec22984 | 940 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
941 | } |
942 | ||
5d6e6b6f PO |
943 | static int ccw_device_move_to_sch(struct ccw_device *cdev, |
944 | struct subchannel *sch) | |
d7b5a4c9 | 945 | { |
5d6e6b6f | 946 | struct subchannel *old_sch; |
0c609fca | 947 | int rc, old_enabled = 0; |
d7b5a4c9 | 948 | |
5d6e6b6f PO |
949 | old_sch = to_subchannel(cdev->dev.parent); |
950 | /* Obtain child reference for new parent. */ | |
6eff208f | 951 | if (!get_device(&sch->dev)) |
5d6e6b6f | 952 | return -ENODEV; |
0c609fca SO |
953 | |
954 | if (!sch_is_pseudo_sch(old_sch)) { | |
955 | spin_lock_irq(old_sch->lock); | |
956 | old_enabled = old_sch->schib.pmcw.ena; | |
957 | rc = 0; | |
958 | if (old_enabled) | |
959 | rc = cio_disable_subchannel(old_sch); | |
960 | spin_unlock_irq(old_sch->lock); | |
961 | if (rc == -EBUSY) { | |
962 | /* Release child reference for new parent. */ | |
963 | put_device(&sch->dev); | |
964 | return rc; | |
965 | } | |
966 | } | |
967 | ||
d7b5a4c9 | 968 | mutex_lock(&sch->reg_mutex); |
ffa6a705 | 969 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
970 | mutex_unlock(&sch->reg_mutex); |
971 | if (rc) { | |
5d6e6b6f | 972 | CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", |
d7b5a4c9 CH |
973 | cdev->private->dev_id.ssid, |
974 | cdev->private->dev_id.devno, sch->schid.ssid, | |
5d6e6b6f | 975 | sch->schib.pmcw.dev, rc); |
0c609fca SO |
976 | if (old_enabled) { |
977 | /* Try to reenable the old subchannel. */ | |
978 | spin_lock_irq(old_sch->lock); | |
979 | cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch); | |
980 | spin_unlock_irq(old_sch->lock); | |
981 | } | |
5d6e6b6f | 982 | /* Release child reference for new parent. */ |
6eff208f | 983 | put_device(&sch->dev); |
5d6e6b6f | 984 | return rc; |
d7b5a4c9 | 985 | } |
5d6e6b6f PO |
986 | /* Clean up old subchannel. */ |
987 | if (!sch_is_pseudo_sch(old_sch)) { | |
988 | spin_lock_irq(old_sch->lock); | |
989 | sch_set_cdev(old_sch, NULL); | |
5d6e6b6f PO |
990 | spin_unlock_irq(old_sch->lock); |
991 | css_schedule_eval(old_sch->schid); | |
d7b5a4c9 | 992 | } |
5d6e6b6f PO |
993 | /* Release child reference for old parent. */ |
994 | put_device(&old_sch->dev); | |
995 | /* Initialize new subchannel. */ | |
996 | spin_lock_irq(sch->lock); | |
997 | cdev->private->schid = sch->schid; | |
998 | cdev->ccwlock = sch->lock; | |
999 | if (!sch_is_pseudo_sch(sch)) | |
1000 | sch_set_cdev(sch, cdev); | |
1001 | spin_unlock_irq(sch->lock); | |
1002 | if (!sch_is_pseudo_sch(sch)) | |
1003 | css_update_ssd_info(sch); | |
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | static int ccw_device_move_to_orph(struct ccw_device *cdev) | |
1008 | { | |
1009 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1010 | struct channel_subsystem *css = to_css(sch->dev.parent); | |
1011 | ||
1012 | return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); | |
d7b5a4c9 CH |
1013 | } |
1014 | ||
602b20f2 CH |
1015 | static void io_subchannel_irq(struct subchannel *sch) |
1016 | { | |
1017 | struct ccw_device *cdev; | |
1018 | ||
db6a6423 | 1019 | cdev = sch_get_cdev(sch); |
602b20f2 | 1020 | |
efd986db SO |
1021 | CIO_TRACE_EVENT(6, "IRQ"); |
1022 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
1023 | if (cdev) |
1024 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
de400d6b | 1025 | else |
420f42ec | 1026 | inc_irq_stat(IRQIO_CIO); |
602b20f2 CH |
1027 | } |
1028 | ||
13952ec1 SO |
1029 | void io_subchannel_init_config(struct subchannel *sch) |
1030 | { | |
1031 | memset(&sch->config, 0, sizeof(sch->config)); | |
1032 | sch->config.csense = 1; | |
13952ec1 SO |
1033 | } |
1034 | ||
0ae7a7b2 CH |
1035 | static void io_subchannel_init_fields(struct subchannel *sch) |
1036 | { | |
1037 | if (cio_is_console(sch->schid)) | |
1038 | sch->opm = 0xff; | |
1039 | else | |
1040 | sch->opm = chp_get_sch_opm(sch); | |
1041 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1042 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1043 | |
1044 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1045 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1046 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1047 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1048 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
1049 | |
1050 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1051 | } |
1052 | ||
90ed2b69 CH |
1053 | /* |
1054 | * Note: We always return 0 so that we bind to the device even on error. | |
1055 | * This is needed so that our remove function is called on unregister. | |
1056 | */ | |
0ae7a7b2 | 1057 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1058 | { |
f92519e8 | 1059 | struct io_subchannel_private *io_priv; |
1da177e4 LT |
1060 | struct ccw_device *cdev; |
1061 | int rc; | |
1da177e4 | 1062 | |
6d7c5afc | 1063 | if (cio_is_console(sch->schid)) { |
7e9db9ea CH |
1064 | rc = sysfs_create_group(&sch->dev.kobj, |
1065 | &io_subchannel_attr_group); | |
1066 | if (rc) | |
1067 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1068 | "attributes for subchannel " | |
1069 | "0.%x.%04x (rc=%d)\n", | |
1070 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 | 1071 | /* |
6d7c5afc | 1072 | * The console subchannel already has an associated ccw_device. |
7e9db9ea | 1073 | * Throw the delayed uevent for the subchannel, register |
6d7c5afc | 1074 | * the ccw_device and exit. |
1da177e4 | 1075 | */ |
f67f129e | 1076 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1077 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
6d7c5afc | 1078 | cdev = sch_get_cdev(sch); |
e1031786 | 1079 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 | 1080 | device_initialize(&cdev->dev); |
24a1872d | 1081 | cdev->private->flags.initialized = 1; |
1da177e4 | 1082 | ccw_device_register(cdev); |
1da177e4 LT |
1083 | /* |
1084 | * Check if the device is already online. If it is | |
9cd67421 CH |
1085 | * the reference count needs to be corrected since we |
1086 | * didn't obtain a reference in ccw_device_set_online. | |
1da177e4 LT |
1087 | */ |
1088 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1089 | cdev->private->state != DEV_STATE_OFFLINE && | |
1090 | cdev->private->state != DEV_STATE_BOXED) | |
1091 | get_device(&cdev->dev); | |
1092 | return 0; | |
1093 | } | |
0ae7a7b2 | 1094 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1095 | rc = cio_commit_config(sch); |
1096 | if (rc) | |
1097 | goto out_schedule; | |
7e9db9ea CH |
1098 | rc = sysfs_create_group(&sch->dev.kobj, |
1099 | &io_subchannel_attr_group); | |
1100 | if (rc) | |
90ed2b69 | 1101 | goto out_schedule; |
cd6b4f27 | 1102 | /* Allocate I/O subchannel private data. */ |
f92519e8 SO |
1103 | io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); |
1104 | if (!io_priv) | |
48e4c385 | 1105 | goto out_schedule; |
f92519e8 SO |
1106 | |
1107 | set_io_private(sch, io_priv); | |
5d6e6b6f | 1108 | css_schedule_eval(sch->schid); |
7e9db9ea | 1109 | return 0; |
48e4c385 | 1110 | |
90ed2b69 | 1111 | out_schedule: |
390935ac PO |
1112 | spin_lock_irq(sch->lock); |
1113 | css_sched_sch_todo(sch, SCH_TODO_UNREG); | |
1114 | spin_unlock_irq(sch->lock); | |
90ed2b69 | 1115 | return 0; |
1da177e4 LT |
1116 | } |
1117 | ||
1da177e4 | 1118 | static int |
8bbace7e | 1119 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 | 1120 | { |
f92519e8 | 1121 | struct io_subchannel_private *io_priv = to_io_private(sch); |
1da177e4 | 1122 | struct ccw_device *cdev; |
1da177e4 | 1123 | |
db6a6423 CH |
1124 | cdev = sch_get_cdev(sch); |
1125 | if (!cdev) | |
48e4c385 | 1126 | goto out_free; |
6e9a0f67 | 1127 | io_subchannel_quiesce(sch); |
1da177e4 | 1128 | /* Set ccw device to not operational and drop reference. */ |
7a8ad100 | 1129 | spin_lock_irq(cdev->ccwlock); |
db6a6423 | 1130 | sch_set_cdev(sch, NULL); |
f92519e8 | 1131 | set_io_private(sch, NULL); |
1da177e4 | 1132 | cdev->private->state = DEV_STATE_NOT_OPER; |
7a8ad100 | 1133 | spin_unlock_irq(cdev->ccwlock); |
ef99516c | 1134 | ccw_device_unregister(cdev); |
48e4c385 | 1135 | out_free: |
f92519e8 | 1136 | kfree(io_priv); |
7e9db9ea | 1137 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1138 | return 0; |
1139 | } | |
1140 | ||
602b20f2 | 1141 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1142 | { |
1143 | struct ccw_device *cdev; | |
1144 | ||
db6a6423 | 1145 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1146 | if (cdev) |
1147 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1148 | } | |
1149 | ||
c820de39 CH |
1150 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1151 | { | |
1152 | struct ccw_device *cdev; | |
1153 | ||
1154 | cdev = sch_get_cdev(sch); | |
1155 | if (!cdev) | |
1156 | return; | |
4257aaec PO |
1157 | if (cio_update_schib(sch)) |
1158 | goto err; | |
1159 | /* Check for I/O on path. */ | |
1160 | if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask) | |
1161 | goto out; | |
1162 | if (cdev->private->state == DEV_STATE_ONLINE) { | |
1163 | ccw_device_kill_io(cdev); | |
1164 | goto out; | |
1165 | } | |
1166 | if (cio_clear(sch)) | |
1167 | goto err; | |
1168 | out: | |
1169 | /* Trigger path verification. */ | |
1170 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1171 | return; | |
c820de39 | 1172 | |
4257aaec PO |
1173 | err: |
1174 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
c820de39 CH |
1175 | } |
1176 | ||
99611f87 CH |
1177 | static int io_subchannel_chp_event(struct subchannel *sch, |
1178 | struct chp_link *link, int event) | |
c820de39 | 1179 | { |
585b954e | 1180 | struct ccw_device *cdev = sch_get_cdev(sch); |
c820de39 | 1181 | int mask; |
c820de39 | 1182 | |
99611f87 | 1183 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1184 | if (!mask) |
1185 | return 0; | |
1186 | switch (event) { | |
1187 | case CHP_VARY_OFF: | |
1188 | sch->opm &= ~mask; | |
1189 | sch->lpm &= ~mask; | |
585b954e SO |
1190 | if (cdev) |
1191 | cdev->private->path_gone_mask |= mask; | |
c820de39 CH |
1192 | io_subchannel_terminate_path(sch, mask); |
1193 | break; | |
1194 | case CHP_VARY_ON: | |
1195 | sch->opm |= mask; | |
1196 | sch->lpm |= mask; | |
585b954e SO |
1197 | if (cdev) |
1198 | cdev->private->path_new_mask |= mask; | |
c820de39 CH |
1199 | io_subchannel_verify(sch); |
1200 | break; | |
1201 | case CHP_OFFLINE: | |
cdb912a4 | 1202 | if (cio_update_schib(sch)) |
c820de39 | 1203 | return -ENODEV; |
585b954e SO |
1204 | if (cdev) |
1205 | cdev->private->path_gone_mask |= mask; | |
c820de39 CH |
1206 | io_subchannel_terminate_path(sch, mask); |
1207 | break; | |
1208 | case CHP_ONLINE: | |
cdb912a4 SO |
1209 | if (cio_update_schib(sch)) |
1210 | return -ENODEV; | |
c820de39 | 1211 | sch->lpm |= mask & sch->opm; |
585b954e SO |
1212 | if (cdev) |
1213 | cdev->private->path_new_mask |= mask; | |
c820de39 CH |
1214 | io_subchannel_verify(sch); |
1215 | break; | |
1216 | } | |
1217 | return 0; | |
1218 | } | |
1219 | ||
6e9a0f67 | 1220 | static void io_subchannel_quiesce(struct subchannel *sch) |
1da177e4 | 1221 | { |
1da177e4 LT |
1222 | struct ccw_device *cdev; |
1223 | int ret; | |
1224 | ||
56e6b796 | 1225 | spin_lock_irq(sch->lock); |
db6a6423 | 1226 | cdev = sch_get_cdev(sch); |
a8237fc4 | 1227 | if (cio_is_console(sch->schid)) |
56e6b796 | 1228 | goto out_unlock; |
1da177e4 | 1229 | if (!sch->schib.pmcw.ena) |
56e6b796 | 1230 | goto out_unlock; |
1da177e4 LT |
1231 | ret = cio_disable_subchannel(sch); |
1232 | if (ret != -EBUSY) | |
56e6b796 | 1233 | goto out_unlock; |
1da177e4 | 1234 | if (cdev->handler) |
56e6b796 SO |
1235 | cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO)); |
1236 | while (ret == -EBUSY) { | |
1237 | cdev->private->state = DEV_STATE_QUIESCE; | |
376ae475 | 1238 | cdev->private->iretry = 255; |
56e6b796 SO |
1239 | ret = ccw_device_cancel_halt_clear(cdev); |
1240 | if (ret == -EBUSY) { | |
1241 | ccw_device_set_timeout(cdev, HZ/10); | |
1242 | spin_unlock_irq(sch->lock); | |
1243 | wait_event(cdev->private->wait_q, | |
1244 | cdev->private->state != DEV_STATE_QUIESCE); | |
1245 | spin_lock_irq(sch->lock); | |
1246 | } | |
1247 | ret = cio_disable_subchannel(sch); | |
1da177e4 | 1248 | } |
56e6b796 SO |
1249 | out_unlock: |
1250 | spin_unlock_irq(sch->lock); | |
1da177e4 LT |
1251 | } |
1252 | ||
6e9a0f67 SO |
1253 | static void io_subchannel_shutdown(struct subchannel *sch) |
1254 | { | |
1255 | io_subchannel_quiesce(sch); | |
1256 | } | |
1257 | ||
c820de39 CH |
1258 | static int device_is_disconnected(struct ccw_device *cdev) |
1259 | { | |
1260 | if (!cdev) | |
1261 | return 0; | |
1262 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1263 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1264 | } | |
1265 | ||
1266 | static int recovery_check(struct device *dev, void *data) | |
1267 | { | |
1268 | struct ccw_device *cdev = to_ccwdev(dev); | |
1269 | int *redo = data; | |
1270 | ||
1271 | spin_lock_irq(cdev->ccwlock); | |
1272 | switch (cdev->private->state) { | |
1273 | case DEV_STATE_DISCONNECTED: | |
1274 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1275 | cdev->private->dev_id.ssid, | |
1276 | cdev->private->dev_id.devno); | |
1277 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1278 | *redo = 1; | |
1279 | break; | |
1280 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1281 | *redo = 1; | |
1282 | break; | |
1283 | } | |
1284 | spin_unlock_irq(cdev->ccwlock); | |
1285 | ||
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | static void recovery_work_func(struct work_struct *unused) | |
1290 | { | |
1291 | int redo = 0; | |
1292 | ||
1293 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1294 | if (redo) { | |
1295 | spin_lock_irq(&recovery_lock); | |
1296 | if (!timer_pending(&recovery_timer)) { | |
1297 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1298 | recovery_phase++; | |
1299 | mod_timer(&recovery_timer, jiffies + | |
1300 | recovery_delay[recovery_phase] * HZ); | |
1301 | } | |
1302 | spin_unlock_irq(&recovery_lock); | |
1303 | } else | |
1304 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1305 | } | |
1306 | ||
1307 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1308 | ||
1309 | static void recovery_func(unsigned long data) | |
1310 | { | |
1311 | /* | |
1312 | * We can't do our recovery in softirq context and it's not | |
1313 | * performance critical, so we schedule it. | |
1314 | */ | |
1315 | schedule_work(&recovery_work); | |
1316 | } | |
1317 | ||
1318 | static void ccw_device_schedule_recovery(void) | |
1319 | { | |
1320 | unsigned long flags; | |
1321 | ||
1322 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1323 | spin_lock_irqsave(&recovery_lock, flags); | |
1324 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1325 | recovery_phase = 0; | |
1326 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1327 | } | |
1328 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1329 | } | |
1330 | ||
ecf5d9ef PO |
1331 | static int purge_fn(struct device *dev, void *data) |
1332 | { | |
1333 | struct ccw_device *cdev = to_ccwdev(dev); | |
37de53bb | 1334 | struct ccw_dev_id *id = &cdev->private->dev_id; |
ecf5d9ef PO |
1335 | |
1336 | spin_lock_irq(cdev->ccwlock); | |
37de53bb | 1337 | if (is_blacklisted(id->ssid, id->devno) && |
a2fc8485 PO |
1338 | (cdev->private->state == DEV_STATE_OFFLINE) && |
1339 | (atomic_cmpxchg(&cdev->private->onoff, 0, 1) == 0)) { | |
37de53bb PO |
1340 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid, |
1341 | id->devno); | |
1342 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
a2fc8485 | 1343 | atomic_set(&cdev->private->onoff, 0); |
37de53bb | 1344 | } |
ecf5d9ef | 1345 | spin_unlock_irq(cdev->ccwlock); |
ecf5d9ef PO |
1346 | /* Abort loop in case of pending signal. */ |
1347 | if (signal_pending(current)) | |
1348 | return -EINTR; | |
1349 | ||
1350 | return 0; | |
1351 | } | |
1352 | ||
1353 | /** | |
1354 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1355 | * | |
1356 | * Unregister all ccw devices that are offline and on the blacklist. | |
1357 | */ | |
1358 | int ccw_purge_blacklisted(void) | |
1359 | { | |
1360 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1361 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1362 | return 0; | |
1363 | } | |
1364 | ||
6afcc775 | 1365 | void ccw_device_set_disconnected(struct ccw_device *cdev) |
c820de39 CH |
1366 | { |
1367 | if (!cdev) | |
1368 | return; | |
1369 | ccw_device_set_timeout(cdev, 0); | |
1370 | cdev->private->flags.fake_irb = 0; | |
1371 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1372 | if (cdev->online) | |
1373 | ccw_device_schedule_recovery(); | |
1374 | } | |
1375 | ||
91c36919 PO |
1376 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1377 | { | |
1378 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1379 | ||
1380 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1381 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1382 | ccw_device_set_timeout(cdev, 0); |
1383 | cio_disable_subchannel(sch); | |
1384 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1385 | } | |
1386 | ||
5d6e6b6f PO |
1387 | enum io_sch_action { |
1388 | IO_SCH_UNREG, | |
1389 | IO_SCH_ORPH_UNREG, | |
1390 | IO_SCH_ATTACH, | |
1391 | IO_SCH_UNREG_ATTACH, | |
1392 | IO_SCH_ORPH_ATTACH, | |
1393 | IO_SCH_REPROBE, | |
1394 | IO_SCH_VERIFY, | |
1395 | IO_SCH_DISC, | |
1396 | IO_SCH_NOP, | |
1397 | }; | |
1398 | ||
1399 | static enum io_sch_action sch_get_action(struct subchannel *sch) | |
1400 | { | |
1401 | struct ccw_device *cdev; | |
1402 | ||
1403 | cdev = sch_get_cdev(sch); | |
1404 | if (cio_update_schib(sch)) { | |
1405 | /* Not operational. */ | |
1406 | if (!cdev) | |
1407 | return IO_SCH_UNREG; | |
76e6fb4b | 1408 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1409 | return IO_SCH_UNREG; |
1410 | return IO_SCH_ORPH_UNREG; | |
1411 | } | |
1412 | /* Operational. */ | |
1413 | if (!cdev) | |
1414 | return IO_SCH_ATTACH; | |
1415 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
76e6fb4b | 1416 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1417 | return IO_SCH_UNREG_ATTACH; |
1418 | return IO_SCH_ORPH_ATTACH; | |
1419 | } | |
1420 | if ((sch->schib.pmcw.pam & sch->opm) == 0) { | |
76e6fb4b | 1421 | if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) |
5d6e6b6f PO |
1422 | return IO_SCH_UNREG; |
1423 | return IO_SCH_DISC; | |
1424 | } | |
1425 | if (device_is_disconnected(cdev)) | |
1426 | return IO_SCH_REPROBE; | |
31370f75 | 1427 | if (cdev->online && !cdev->private->flags.resuming) |
5d6e6b6f | 1428 | return IO_SCH_VERIFY; |
43d0be75 SO |
1429 | if (cdev->private->state == DEV_STATE_NOT_OPER) |
1430 | return IO_SCH_UNREG_ATTACH; | |
5d6e6b6f PO |
1431 | return IO_SCH_NOP; |
1432 | } | |
1433 | ||
1434 | /** | |
1435 | * io_subchannel_sch_event - process subchannel event | |
1436 | * @sch: subchannel | |
1437 | * @process: non-zero if function is called in process context | |
1438 | * | |
1439 | * An unspecified event occurred for this subchannel. Adjust data according | |
1440 | * to the current operational state of the subchannel and device. Return | |
1441 | * zero when the event has been handled sufficiently or -EAGAIN when this | |
1442 | * function should be called again in process context. | |
1443 | */ | |
1444 | static int io_subchannel_sch_event(struct subchannel *sch, int process) | |
c820de39 | 1445 | { |
c820de39 | 1446 | unsigned long flags; |
c820de39 | 1447 | struct ccw_device *cdev; |
5d6e6b6f PO |
1448 | struct ccw_dev_id dev_id; |
1449 | enum io_sch_action action; | |
1450 | int rc = -EAGAIN; | |
c820de39 CH |
1451 | |
1452 | spin_lock_irqsave(sch->lock, flags); | |
5d6e6b6f PO |
1453 | if (!device_is_registered(&sch->dev)) |
1454 | goto out_unlock; | |
390935ac PO |
1455 | if (work_pending(&sch->todo_work)) |
1456 | goto out_unlock; | |
37de53bb PO |
1457 | cdev = sch_get_cdev(sch); |
1458 | if (cdev && work_pending(&cdev->private->todo_work)) | |
1459 | goto out_unlock; | |
5d6e6b6f PO |
1460 | action = sch_get_action(sch); |
1461 | CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", | |
1462 | sch->schid.ssid, sch->schid.sch_no, process, | |
1463 | action); | |
1464 | /* Perform immediate actions while holding the lock. */ | |
5d6e6b6f PO |
1465 | switch (action) { |
1466 | case IO_SCH_REPROBE: | |
1467 | /* Trigger device recognition. */ | |
1468 | ccw_device_trigger_reprobe(cdev); | |
1469 | rc = 0; | |
1470 | goto out_unlock; | |
1471 | case IO_SCH_VERIFY: | |
1472 | /* Trigger path verification. */ | |
1473 | io_subchannel_verify(sch); | |
1474 | rc = 0; | |
1475 | goto out_unlock; | |
1476 | case IO_SCH_DISC: | |
1477 | ccw_device_set_disconnected(cdev); | |
1478 | rc = 0; | |
1479 | goto out_unlock; | |
1480 | case IO_SCH_ORPH_UNREG: | |
1481 | case IO_SCH_ORPH_ATTACH: | |
1482 | ccw_device_set_disconnected(cdev); | |
1483 | break; | |
1484 | case IO_SCH_UNREG_ATTACH: | |
1485 | case IO_SCH_UNREG: | |
16d2ce27 SO |
1486 | if (!cdev) |
1487 | break; | |
1488 | if (cdev->private->state == DEV_STATE_SENSE_ID) { | |
1489 | /* | |
1490 | * Note: delayed work triggered by this event | |
1491 | * and repeated calls to sch_event are synchronized | |
1492 | * by the above check for work_pending(cdev). | |
1493 | */ | |
1494 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
1495 | } else | |
5d6e6b6f PO |
1496 | ccw_device_set_notoper(cdev); |
1497 | break; | |
1498 | case IO_SCH_NOP: | |
1499 | rc = 0; | |
1500 | goto out_unlock; | |
1501 | default: | |
1502 | break; | |
c820de39 | 1503 | } |
5d6e6b6f PO |
1504 | spin_unlock_irqrestore(sch->lock, flags); |
1505 | /* All other actions require process context. */ | |
1506 | if (!process) | |
1507 | goto out; | |
1508 | /* Handle attached ccw device. */ | |
1509 | switch (action) { | |
1510 | case IO_SCH_ORPH_UNREG: | |
1511 | case IO_SCH_ORPH_ATTACH: | |
1512 | /* Move ccw device to orphanage. */ | |
1513 | rc = ccw_device_move_to_orph(cdev); | |
1514 | if (rc) | |
1515 | goto out; | |
c820de39 | 1516 | break; |
5d6e6b6f | 1517 | case IO_SCH_UNREG_ATTACH: |
3368ba25 | 1518 | spin_lock_irqsave(sch->lock, flags); |
74b6127e SO |
1519 | if (cdev->private->flags.resuming) { |
1520 | /* Device will be handled later. */ | |
1521 | rc = 0; | |
3368ba25 | 1522 | goto out_unlock; |
74b6127e | 1523 | } |
3368ba25 SO |
1524 | sch_set_cdev(sch, NULL); |
1525 | spin_unlock_irqrestore(sch->lock, flags); | |
5d6e6b6f | 1526 | /* Unregister ccw device. */ |
74b6127e | 1527 | ccw_device_unregister(cdev); |
c820de39 | 1528 | break; |
5d6e6b6f | 1529 | default: |
c820de39 CH |
1530 | break; |
1531 | } | |
5d6e6b6f | 1532 | /* Handle subchannel. */ |
c820de39 | 1533 | switch (action) { |
5d6e6b6f PO |
1534 | case IO_SCH_ORPH_UNREG: |
1535 | case IO_SCH_UNREG: | |
0d01bb89 SO |
1536 | if (!cdev || !cdev->private->flags.resuming) |
1537 | css_sch_device_unregister(sch); | |
c820de39 | 1538 | break; |
5d6e6b6f PO |
1539 | case IO_SCH_ORPH_ATTACH: |
1540 | case IO_SCH_UNREG_ATTACH: | |
1541 | case IO_SCH_ATTACH: | |
1542 | dev_id.ssid = sch->schid.ssid; | |
1543 | dev_id.devno = sch->schib.pmcw.dev; | |
1544 | cdev = get_ccwdev_by_dev_id(&dev_id); | |
1545 | if (!cdev) { | |
1546 | sch_create_and_recog_new_device(sch); | |
1547 | break; | |
1548 | } | |
1549 | rc = ccw_device_move_to_sch(cdev, sch); | |
1550 | if (rc) { | |
1551 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1552 | put_device(&cdev->dev); | |
1553 | goto out; | |
1554 | } | |
1555 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 | 1556 | ccw_device_trigger_reprobe(cdev); |
5d6e6b6f PO |
1557 | spin_unlock_irqrestore(sch->lock, flags); |
1558 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1559 | put_device(&cdev->dev); | |
91c36919 | 1560 | break; |
c820de39 CH |
1561 | default: |
1562 | break; | |
1563 | } | |
5d6e6b6f | 1564 | return 0; |
c820de39 | 1565 | |
5d6e6b6f PO |
1566 | out_unlock: |
1567 | spin_unlock_irqrestore(sch->lock, flags); | |
1568 | out: | |
1569 | return rc; | |
c820de39 CH |
1570 | } |
1571 | ||
1da177e4 LT |
1572 | #ifdef CONFIG_CCW_CONSOLE |
1573 | static struct ccw_device console_cdev; | |
1574 | static struct ccw_device_private console_private; | |
1575 | static int console_cdev_in_use; | |
1576 | ||
2ec22984 CH |
1577 | static DEFINE_SPINLOCK(ccw_console_lock); |
1578 | ||
1579 | spinlock_t * cio_get_console_lock(void) | |
1580 | { | |
1581 | return &ccw_console_lock; | |
1582 | } | |
1583 | ||
0ae7a7b2 CH |
1584 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1585 | struct subchannel *sch) | |
1da177e4 | 1586 | { |
f92519e8 | 1587 | struct io_subchannel_private *io_priv = cio_get_console_priv(); |
1da177e4 LT |
1588 | int rc; |
1589 | ||
cd6b4f27 | 1590 | /* Attach subchannel private data. */ |
f92519e8 SO |
1591 | memset(io_priv, 0, sizeof(*io_priv)); |
1592 | set_io_private(sch, io_priv); | |
0ae7a7b2 | 1593 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1594 | rc = cio_commit_config(sch); |
1595 | if (rc) | |
1596 | return rc; | |
0ae7a7b2 | 1597 | sch->driver = &io_subchannel_driver; |
1da177e4 | 1598 | /* Initialize the ccw_device structure. */ |
292888c8 | 1599 | cdev->dev.parent= &sch->dev; |
ffa8d2a3 | 1600 | sch_set_cdev(sch, cdev); |
736b5db8 | 1601 | io_subchannel_recog(cdev, sch); |
1da177e4 LT |
1602 | /* Now wait for the async. recognition to come to an end. */ |
1603 | spin_lock_irq(cdev->ccwlock); | |
1604 | while (!dev_fsm_final_state(cdev)) | |
1605 | wait_cons_dev(); | |
1606 | rc = -EIO; | |
1607 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1608 | goto out_unlock; | |
1609 | ccw_device_online(cdev); | |
1610 | while (!dev_fsm_final_state(cdev)) | |
1611 | wait_cons_dev(); | |
1612 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1613 | goto out_unlock; | |
1614 | rc = 0; | |
1615 | out_unlock: | |
1616 | spin_unlock_irq(cdev->ccwlock); | |
736b5db8 | 1617 | return rc; |
1da177e4 LT |
1618 | } |
1619 | ||
1620 | struct ccw_device * | |
1621 | ccw_device_probe_console(void) | |
1622 | { | |
1623 | struct subchannel *sch; | |
1624 | int ret; | |
1625 | ||
1626 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1627 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1628 | sch = cio_probe_console(); |
1629 | if (IS_ERR(sch)) { | |
1630 | console_cdev_in_use = 0; | |
1631 | return (void *) sch; | |
1632 | } | |
1633 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1634 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1635 | console_cdev.private = &console_private; | |
c1637532 | 1636 | console_private.cdev = &console_cdev; |
420f42ec | 1637 | console_private.int_class = IRQIO_CIO; |
1da177e4 LT |
1638 | ret = ccw_device_console_enable(&console_cdev, sch); |
1639 | if (ret) { | |
1640 | cio_release_console(); | |
1641 | console_cdev_in_use = 0; | |
1642 | return ERR_PTR(ret); | |
1643 | } | |
1644 | console_cdev.online = 1; | |
1645 | return &console_cdev; | |
1646 | } | |
1f4e7eda | 1647 | |
6664845c MS |
1648 | static int ccw_device_pm_restore(struct device *dev); |
1649 | ||
1650 | int ccw_device_force_console(void) | |
1651 | { | |
1652 | if (!console_cdev_in_use) | |
1653 | return -ENODEV; | |
1654 | return ccw_device_pm_restore(&console_cdev.dev); | |
1655 | } | |
1656 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1657 | #endif |
1658 | ||
1659 | /* | |
1660 | * get ccw_device matching the busid, but only if owned by cdrv | |
1661 | */ | |
b0744bd2 CH |
1662 | static int |
1663 | __ccwdev_check_busid(struct device *dev, void *id) | |
1664 | { | |
1665 | char *bus_id; | |
1666 | ||
12975aef | 1667 | bus_id = id; |
b0744bd2 | 1668 | |
98df67b3 | 1669 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1670 | } |
1671 | ||
1672 | ||
b2ffd8e9 CH |
1673 | /** |
1674 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1675 | * @cdrv: driver the device is owned by | |
1676 | * @bus_id: bus id of the device to be searched | |
1677 | * | |
1678 | * This function searches all devices owned by @cdrv for a device with a bus | |
1679 | * id matching @bus_id. | |
1680 | * Returns: | |
1681 | * If a match is found, its reference count of the found device is increased | |
1682 | * and it is returned; else %NULL is returned. | |
1683 | */ | |
1684 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1685 | const char *bus_id) | |
1da177e4 | 1686 | { |
b0744bd2 | 1687 | struct device *dev; |
1da177e4 | 1688 | |
9f30ea95 | 1689 | dev = driver_find_device(&cdrv->driver, NULL, (void *)bus_id, |
b0744bd2 | 1690 | __ccwdev_check_busid); |
1da177e4 | 1691 | |
d2c993d8 | 1692 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1693 | } |
1694 | ||
1695 | /************************** device driver handling ************************/ | |
1696 | ||
1697 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1698 | * and release methods are initially very similar to the device_driver | |
1699 | * implementations, with the difference that they have ccw_device | |
1700 | * arguments. | |
1701 | * | |
1702 | * A ccw driver also contains the information that is needed for | |
1703 | * device matching. | |
1704 | */ | |
1705 | static int | |
1706 | ccw_device_probe (struct device *dev) | |
1707 | { | |
1708 | struct ccw_device *cdev = to_ccwdev(dev); | |
1709 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1710 | int ret; | |
1711 | ||
1712 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
de400d6b PO |
1713 | /* Note: we interpret class 0 in this context as an uninitialized |
1714 | * field since it translates to a non-I/O interrupt class. */ | |
1715 | if (cdrv->int_class != 0) | |
1716 | cdev->private->int_class = cdrv->int_class; | |
1717 | else | |
420f42ec | 1718 | cdev->private->int_class = IRQIO_CIO; |
1da177e4 LT |
1719 | |
1720 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1721 | ||
1722 | if (ret) { | |
d2c993d8 | 1723 | cdev->drv = NULL; |
420f42ec | 1724 | cdev->private->int_class = IRQIO_CIO; |
1da177e4 LT |
1725 | return ret; |
1726 | } | |
1727 | ||
1728 | return 0; | |
1729 | } | |
1730 | ||
1731 | static int | |
1732 | ccw_device_remove (struct device *dev) | |
1733 | { | |
1734 | struct ccw_device *cdev = to_ccwdev(dev); | |
1735 | struct ccw_driver *cdrv = cdev->drv; | |
1736 | int ret; | |
1737 | ||
1da177e4 LT |
1738 | if (cdrv->remove) |
1739 | cdrv->remove(cdev); | |
1740 | if (cdev->online) { | |
1741 | cdev->online = 0; | |
1742 | spin_lock_irq(cdev->ccwlock); | |
1743 | ret = ccw_device_offline(cdev); | |
1744 | spin_unlock_irq(cdev->ccwlock); | |
1745 | if (ret == 0) | |
1746 | wait_event(cdev->private->wait_q, | |
1747 | dev_fsm_final_state(cdev)); | |
1748 | else | |
139b83dd | 1749 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1750 | "device 0.%x.%04x\n", |
1751 | ret, cdev->private->dev_id.ssid, | |
1752 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1753 | /* Give up reference obtained in ccw_device_set_online(). */ |
1754 | put_device(&cdev->dev); | |
1da177e4 LT |
1755 | } |
1756 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1757 | cdev->drv = NULL; |
420f42ec | 1758 | cdev->private->int_class = IRQIO_CIO; |
1da177e4 LT |
1759 | return 0; |
1760 | } | |
1761 | ||
958974fb CH |
1762 | static void ccw_device_shutdown(struct device *dev) |
1763 | { | |
1764 | struct ccw_device *cdev; | |
1765 | ||
1766 | cdev = to_ccwdev(dev); | |
1767 | if (cdev->drv && cdev->drv->shutdown) | |
1768 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1769 | disable_cmf(cdev); |
958974fb CH |
1770 | } |
1771 | ||
823d494a SO |
1772 | static int ccw_device_pm_prepare(struct device *dev) |
1773 | { | |
1774 | struct ccw_device *cdev = to_ccwdev(dev); | |
1775 | ||
37de53bb | 1776 | if (work_pending(&cdev->private->todo_work)) |
823d494a SO |
1777 | return -EAGAIN; |
1778 | /* Fail while device is being set online/offline. */ | |
1779 | if (atomic_read(&cdev->private->onoff)) | |
1780 | return -EAGAIN; | |
1781 | ||
1782 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1783 | return cdev->drv->prepare(cdev); | |
1784 | ||
1785 | return 0; | |
1786 | } | |
1787 | ||
1788 | static void ccw_device_pm_complete(struct device *dev) | |
1789 | { | |
1790 | struct ccw_device *cdev = to_ccwdev(dev); | |
1791 | ||
1792 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1793 | cdev->drv->complete(cdev); | |
1794 | } | |
1795 | ||
1796 | static int ccw_device_pm_freeze(struct device *dev) | |
1797 | { | |
1798 | struct ccw_device *cdev = to_ccwdev(dev); | |
1799 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1800 | int ret, cm_enabled; | |
1801 | ||
1802 | /* Fail suspend while device is in transistional state. */ | |
1803 | if (!dev_fsm_final_state(cdev)) | |
1804 | return -EAGAIN; | |
1805 | if (!cdev->online) | |
1806 | return 0; | |
1807 | if (cdev->drv && cdev->drv->freeze) { | |
1808 | ret = cdev->drv->freeze(cdev); | |
1809 | if (ret) | |
1810 | return ret; | |
1811 | } | |
1812 | ||
1813 | spin_lock_irq(sch->lock); | |
1814 | cm_enabled = cdev->private->cmb != NULL; | |
1815 | spin_unlock_irq(sch->lock); | |
1816 | if (cm_enabled) { | |
1817 | /* Don't have the css write on memory. */ | |
1818 | ret = ccw_set_cmf(cdev, 0); | |
1819 | if (ret) | |
1820 | return ret; | |
1821 | } | |
1822 | /* From here on, disallow device driver I/O. */ | |
1823 | spin_lock_irq(sch->lock); | |
1824 | ret = cio_disable_subchannel(sch); | |
1825 | spin_unlock_irq(sch->lock); | |
1826 | ||
1827 | return ret; | |
1828 | } | |
1829 | ||
1830 | static int ccw_device_pm_thaw(struct device *dev) | |
1831 | { | |
1832 | struct ccw_device *cdev = to_ccwdev(dev); | |
1833 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1834 | int ret, cm_enabled; | |
1835 | ||
1836 | if (!cdev->online) | |
1837 | return 0; | |
1838 | ||
1839 | spin_lock_irq(sch->lock); | |
1840 | /* Allow device driver I/O again. */ | |
1841 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1842 | cm_enabled = cdev->private->cmb != NULL; | |
1843 | spin_unlock_irq(sch->lock); | |
1844 | if (ret) | |
1845 | return ret; | |
1846 | ||
1847 | if (cm_enabled) { | |
1848 | ret = ccw_set_cmf(cdev, 1); | |
1849 | if (ret) | |
1850 | return ret; | |
1851 | } | |
1852 | ||
1853 | if (cdev->drv && cdev->drv->thaw) | |
1854 | ret = cdev->drv->thaw(cdev); | |
1855 | ||
1856 | return ret; | |
1857 | } | |
1858 | ||
1859 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
1860 | { | |
1861 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
823d494a | 1862 | |
0d01bb89 SO |
1863 | spin_lock_irq(sch->lock); |
1864 | if (cio_is_console(sch->schid)) { | |
1865 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1866 | goto out_unlock; | |
1867 | } | |
823d494a SO |
1868 | /* |
1869 | * While we were sleeping, devices may have gone or become | |
1870 | * available again. Kick re-detection. | |
1871 | */ | |
823d494a | 1872 | cdev->private->flags.resuming = 1; |
b17295e6 | 1873 | cdev->private->path_new_mask = LPM_ANYPATH; |
817e5000 | 1874 | css_sched_sch_todo(sch, SCH_TODO_EVAL); |
0d01bb89 | 1875 | spin_unlock_irq(sch->lock); |
817e5000 | 1876 | css_wait_for_slow_path(); |
0d01bb89 SO |
1877 | |
1878 | /* cdev may have been moved to a different subchannel. */ | |
1879 | sch = to_subchannel(cdev->dev.parent); | |
1880 | spin_lock_irq(sch->lock); | |
1881 | if (cdev->private->state != DEV_STATE_ONLINE && | |
1882 | cdev->private->state != DEV_STATE_OFFLINE) | |
1883 | goto out_unlock; | |
1884 | ||
736b5db8 | 1885 | ccw_device_recognition(cdev); |
823d494a | 1886 | spin_unlock_irq(sch->lock); |
823d494a SO |
1887 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || |
1888 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
0d01bb89 SO |
1889 | spin_lock_irq(sch->lock); |
1890 | ||
1891 | out_unlock: | |
823d494a | 1892 | cdev->private->flags.resuming = 0; |
0d01bb89 | 1893 | spin_unlock_irq(sch->lock); |
823d494a SO |
1894 | } |
1895 | ||
1896 | static int resume_handle_boxed(struct ccw_device *cdev) | |
1897 | { | |
1898 | cdev->private->state = DEV_STATE_BOXED; | |
76e6fb4b | 1899 | if (ccw_device_notify(cdev, CIO_BOXED) == NOTIFY_OK) |
823d494a | 1900 | return 0; |
37de53bb | 1901 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1902 | return -ENODEV; |
1903 | } | |
1904 | ||
1905 | static int resume_handle_disc(struct ccw_device *cdev) | |
1906 | { | |
1907 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
76e6fb4b | 1908 | if (ccw_device_notify(cdev, CIO_GONE) == NOTIFY_OK) |
823d494a | 1909 | return 0; |
37de53bb | 1910 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1911 | return -ENODEV; |
1912 | } | |
1913 | ||
1914 | static int ccw_device_pm_restore(struct device *dev) | |
1915 | { | |
1916 | struct ccw_device *cdev = to_ccwdev(dev); | |
0d01bb89 SO |
1917 | struct subchannel *sch; |
1918 | int ret = 0; | |
823d494a SO |
1919 | |
1920 | __ccw_device_pm_restore(cdev); | |
0d01bb89 | 1921 | sch = to_subchannel(cdev->dev.parent); |
823d494a | 1922 | spin_lock_irq(sch->lock); |
0d01bb89 | 1923 | if (cio_is_console(sch->schid)) |
823d494a | 1924 | goto out_restore; |
0d01bb89 | 1925 | |
823d494a SO |
1926 | /* check recognition results */ |
1927 | switch (cdev->private->state) { | |
1928 | case DEV_STATE_OFFLINE: | |
0d01bb89 SO |
1929 | case DEV_STATE_ONLINE: |
1930 | cdev->private->flags.donotify = 0; | |
823d494a SO |
1931 | break; |
1932 | case DEV_STATE_BOXED: | |
1933 | ret = resume_handle_boxed(cdev); | |
823d494a | 1934 | if (ret) |
0d01bb89 | 1935 | goto out_unlock; |
823d494a | 1936 | goto out_restore; |
823d494a | 1937 | default: |
0d01bb89 SO |
1938 | ret = resume_handle_disc(cdev); |
1939 | if (ret) | |
1940 | goto out_unlock; | |
1941 | goto out_restore; | |
823d494a SO |
1942 | } |
1943 | /* check if the device type has changed */ | |
1944 | if (!ccw_device_test_sense_data(cdev)) { | |
1945 | ccw_device_update_sense_data(cdev); | |
37de53bb | 1946 | ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); |
823d494a SO |
1947 | ret = -ENODEV; |
1948 | goto out_unlock; | |
1949 | } | |
0d01bb89 | 1950 | if (!cdev->online) |
823d494a | 1951 | goto out_unlock; |
823d494a | 1952 | |
0d01bb89 SO |
1953 | if (ccw_device_online(cdev)) { |
1954 | ret = resume_handle_disc(cdev); | |
1955 | if (ret) | |
1956 | goto out_unlock; | |
1957 | goto out_restore; | |
1958 | } | |
823d494a | 1959 | spin_unlock_irq(sch->lock); |
823d494a | 1960 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
0d01bb89 SO |
1961 | spin_lock_irq(sch->lock); |
1962 | ||
1963 | if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) { | |
1964 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1965 | ret = -ENODEV; | |
1966 | goto out_unlock; | |
823d494a | 1967 | } |
0d01bb89 SO |
1968 | |
1969 | /* reenable cmf, if needed */ | |
1970 | if (cdev->private->cmb) { | |
1971 | spin_unlock_irq(sch->lock); | |
823d494a | 1972 | ret = ccw_set_cmf(cdev, 1); |
0d01bb89 | 1973 | spin_lock_irq(sch->lock); |
823d494a | 1974 | if (ret) { |
f014824e SO |
1975 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
1976 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
1977 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
1978 | ret = 0; |
1979 | } | |
1980 | } | |
1981 | ||
1982 | out_restore: | |
0d01bb89 | 1983 | spin_unlock_irq(sch->lock); |
823d494a SO |
1984 | if (cdev->online && cdev->drv && cdev->drv->restore) |
1985 | ret = cdev->drv->restore(cdev); | |
823d494a SO |
1986 | return ret; |
1987 | ||
823d494a SO |
1988 | out_unlock: |
1989 | spin_unlock_irq(sch->lock); | |
1990 | return ret; | |
1991 | } | |
1992 | ||
47145210 | 1993 | static const struct dev_pm_ops ccw_pm_ops = { |
823d494a SO |
1994 | .prepare = ccw_device_pm_prepare, |
1995 | .complete = ccw_device_pm_complete, | |
1996 | .freeze = ccw_device_pm_freeze, | |
1997 | .thaw = ccw_device_pm_thaw, | |
1998 | .restore = ccw_device_pm_restore, | |
1999 | }; | |
2000 | ||
d5ab5276 | 2001 | static struct bus_type ccw_bus_type = { |
8bbace7e CH |
2002 | .name = "ccw", |
2003 | .match = ccw_bus_match, | |
2004 | .uevent = ccw_uevent, | |
2005 | .probe = ccw_device_probe, | |
2006 | .remove = ccw_device_remove, | |
958974fb | 2007 | .shutdown = ccw_device_shutdown, |
823d494a | 2008 | .pm = &ccw_pm_ops, |
8bbace7e CH |
2009 | }; |
2010 | ||
b2ffd8e9 CH |
2011 | /** |
2012 | * ccw_driver_register() - register a ccw driver | |
2013 | * @cdriver: driver to be registered | |
2014 | * | |
2015 | * This function is mainly a wrapper around driver_register(). | |
2016 | * Returns: | |
2017 | * %0 on success and a negative error value on failure. | |
2018 | */ | |
2019 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
2020 | { |
2021 | struct device_driver *drv = &cdriver->driver; | |
2022 | ||
2023 | drv->bus = &ccw_bus_type; | |
1da177e4 LT |
2024 | |
2025 | return driver_register(drv); | |
2026 | } | |
2027 | ||
b2ffd8e9 CH |
2028 | /** |
2029 | * ccw_driver_unregister() - deregister a ccw driver | |
2030 | * @cdriver: driver to be deregistered | |
2031 | * | |
2032 | * This function is mainly a wrapper around driver_unregister(). | |
2033 | */ | |
2034 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
2035 | { |
2036 | driver_unregister(&cdriver->driver); | |
2037 | } | |
2038 | ||
37de53bb PO |
2039 | static void ccw_device_todo(struct work_struct *work) |
2040 | { | |
2041 | struct ccw_device_private *priv; | |
2042 | struct ccw_device *cdev; | |
2043 | struct subchannel *sch; | |
2044 | enum cdev_todo todo; | |
2045 | ||
2046 | priv = container_of(work, struct ccw_device_private, todo_work); | |
2047 | cdev = priv->cdev; | |
2048 | sch = to_subchannel(cdev->dev.parent); | |
2049 | /* Find out todo. */ | |
2050 | spin_lock_irq(cdev->ccwlock); | |
2051 | todo = priv->todo; | |
2052 | priv->todo = CDEV_TODO_NOTHING; | |
2053 | CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n", | |
2054 | priv->dev_id.ssid, priv->dev_id.devno, todo); | |
2055 | spin_unlock_irq(cdev->ccwlock); | |
2056 | /* Perform todo. */ | |
2057 | switch (todo) { | |
2058 | case CDEV_TODO_ENABLE_CMF: | |
2059 | cmf_reenable(cdev); | |
2060 | break; | |
2061 | case CDEV_TODO_REBIND: | |
2062 | ccw_device_do_unbind_bind(cdev); | |
2063 | break; | |
2064 | case CDEV_TODO_REGISTER: | |
2065 | io_subchannel_register(cdev); | |
2066 | break; | |
2067 | case CDEV_TODO_UNREG_EVAL: | |
2068 | if (!sch_is_pseudo_sch(sch)) | |
2069 | css_schedule_eval(sch->schid); | |
2070 | /* fall-through */ | |
2071 | case CDEV_TODO_UNREG: | |
2072 | if (sch_is_pseudo_sch(sch)) | |
2073 | ccw_device_unregister(cdev); | |
2074 | else | |
2075 | ccw_device_call_sch_unregister(cdev); | |
2076 | break; | |
2077 | default: | |
2078 | break; | |
2079 | } | |
2080 | /* Release workqueue ref. */ | |
2081 | put_device(&cdev->dev); | |
2082 | } | |
2083 | ||
2084 | /** | |
2085 | * ccw_device_sched_todo - schedule ccw device operation | |
2086 | * @cdev: ccw device | |
2087 | * @todo: todo | |
2088 | * | |
2089 | * Schedule the operation identified by @todo to be performed on the slow path | |
2090 | * workqueue. Do nothing if another operation with higher priority is already | |
2091 | * scheduled. Needs to be called with ccwdev lock held. | |
2092 | */ | |
2093 | void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo) | |
2094 | { | |
2095 | CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n", | |
2096 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
2097 | todo); | |
2098 | if (cdev->private->todo >= todo) | |
2099 | return; | |
2100 | cdev->private->todo = todo; | |
2101 | /* Get workqueue ref. */ | |
2102 | if (!get_device(&cdev->dev)) | |
2103 | return; | |
be5d3823 | 2104 | if (!queue_work(cio_work_q, &cdev->private->todo_work)) { |
37de53bb PO |
2105 | /* Already queued, release workqueue ref. */ |
2106 | put_device(&cdev->dev); | |
2107 | } | |
2108 | } | |
2109 | ||
fd0457a6 ME |
2110 | /** |
2111 | * ccw_device_siosl() - initiate logging | |
2112 | * @cdev: ccw device | |
2113 | * | |
2114 | * This function is used to invoke model-dependent logging within the channel | |
2115 | * subsystem. | |
2116 | */ | |
2117 | int ccw_device_siosl(struct ccw_device *cdev) | |
2118 | { | |
2119 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
2120 | ||
2121 | return chsc_siosl(sch->schid); | |
2122 | } | |
2123 | EXPORT_SYMBOL_GPL(ccw_device_siosl); | |
2124 | ||
1da177e4 LT |
2125 | MODULE_LICENSE("GPL"); |
2126 | EXPORT_SYMBOL(ccw_device_set_online); | |
2127 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2128 | EXPORT_SYMBOL(ccw_driver_register); | |
2129 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2130 | EXPORT_SYMBOL(get_ccwdev_by_busid); |