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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> | |
188561a4 | 22 | #include <linux/delay.h> |
90ab1336 | 23 | #include <linux/timer.h> |
de400d6b | 24 | #include <linux/kernel_stat.h> |
1da177e4 LT |
25 | |
26 | #include <asm/ccwdev.h> | |
27 | #include <asm/cio.h> | |
4e57b681 | 28 | #include <asm/param.h> /* HZ */ |
1842f2b1 | 29 | #include <asm/cmb.h> |
3a3fc29a | 30 | #include <asm/isc.h> |
1da177e4 | 31 | |
0ae7a7b2 | 32 | #include "chp.h" |
1da177e4 | 33 | #include "cio.h" |
d7b5a4c9 | 34 | #include "cio_debug.h" |
1da177e4 LT |
35 | #include "css.h" |
36 | #include "device.h" | |
37 | #include "ioasm.h" | |
cd6b4f27 | 38 | #include "io_sch.h" |
ecf5d9ef | 39 | #include "blacklist.h" |
fd0457a6 | 40 | #include "chsc.h" |
1da177e4 | 41 | |
90ab1336 | 42 | static struct timer_list recovery_timer; |
486d0a00 | 43 | static DEFINE_SPINLOCK(recovery_lock); |
90ab1336 PO |
44 | static int recovery_phase; |
45 | static const unsigned long recovery_delay[] = { 3, 30, 300 }; | |
46 | ||
0ad8f714 SO |
47 | static atomic_t ccw_device_init_count = ATOMIC_INIT(0); |
48 | static DECLARE_WAIT_QUEUE_HEAD(ccw_device_init_wq); | |
49 | static struct bus_type ccw_bus_type; | |
50 | ||
1da177e4 LT |
51 | /******************* bus type handling ***********************/ |
52 | ||
53 | /* The Linux driver model distinguishes between a bus type and | |
54 | * the bus itself. Of course we only have one channel | |
55 | * subsystem driver and one channel system per machine, but | |
56 | * we still use the abstraction. T.R. says it's a good idea. */ | |
57 | static int | |
58 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
59 | { | |
60 | struct ccw_device *cdev = to_ccwdev(dev); | |
61 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
62 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
63 | ||
64 | if (!ids) | |
65 | return 0; | |
66 | ||
67 | found = ccw_device_id_match(ids, &cdev->id); | |
68 | if (!found) | |
69 | return 0; | |
70 | ||
71 | cdev->id.driver_info = found->driver_info; | |
72 | ||
73 | return 1; | |
74 | } | |
75 | ||
db0c2d59 PO |
76 | /* Store modalias string delimited by prefix/suffix string into buffer with |
77 | * specified size. Return length of resulting string (excluding trailing '\0') | |
78 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 79 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 80 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 81 | { |
db0c2d59 | 82 | int len; |
1da177e4 | 83 | |
cfbe9bb2 | 84 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
85 | if (len > size) |
86 | return len; | |
87 | buf += len; | |
88 | size -= len; | |
1da177e4 | 89 | |
db0c2d59 PO |
90 | if (id->dev_type != 0) |
91 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
92 | id->dev_model, suffix); | |
93 | else | |
94 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 95 | |
db0c2d59 PO |
96 | return len; |
97 | } | |
98 | ||
99 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
100 | * non-zero otherwise. */ | |
7eff2e7a | 101 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
102 | { |
103 | struct ccw_device *cdev = to_ccwdev(dev); | |
104 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
105 | int ret; |
106 | char modalias_buf[30]; | |
1da177e4 | 107 | |
db0c2d59 | 108 | /* CU_TYPE= */ |
7eff2e7a | 109 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
110 | if (ret) |
111 | return ret; | |
db0c2d59 PO |
112 | |
113 | /* CU_MODEL= */ | |
7eff2e7a | 114 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
115 | if (ret) |
116 | return ret; | |
1da177e4 LT |
117 | |
118 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 119 | /* DEV_TYPE= */ |
7eff2e7a | 120 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
121 | if (ret) |
122 | return ret; | |
1da177e4 | 123 | |
db0c2d59 | 124 | /* DEV_MODEL= */ |
7eff2e7a | 125 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
126 | if (ret) |
127 | return ret; | |
db0c2d59 PO |
128 | |
129 | /* MODALIAS= */ | |
cfbe9bb2 | 130 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
131 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
132 | return ret; | |
1da177e4 LT |
133 | } |
134 | ||
602b20f2 CH |
135 | static void io_subchannel_irq(struct subchannel *); |
136 | static int io_subchannel_probe(struct subchannel *); | |
137 | static int io_subchannel_remove(struct subchannel *); | |
8bbace7e | 138 | static void io_subchannel_shutdown(struct subchannel *); |
c820de39 | 139 | static int io_subchannel_sch_event(struct subchannel *, int); |
99611f87 CH |
140 | static int io_subchannel_chp_event(struct subchannel *, struct chp_link *, |
141 | int); | |
8ea7f559 | 142 | static void recovery_func(unsigned long data); |
1da177e4 | 143 | |
f08adc00 CH |
144 | static struct css_device_id io_subchannel_ids[] = { |
145 | { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, | |
146 | { /* end of list */ }, | |
147 | }; | |
148 | MODULE_DEVICE_TABLE(css, io_subchannel_ids); | |
149 | ||
93a27592 CH |
150 | static int io_subchannel_prepare(struct subchannel *sch) |
151 | { | |
152 | struct ccw_device *cdev; | |
153 | /* | |
154 | * Don't allow suspend while a ccw device registration | |
155 | * is still outstanding. | |
156 | */ | |
157 | cdev = sch_get_cdev(sch); | |
158 | if (cdev && !device_is_registered(&cdev->dev)) | |
159 | return -EAGAIN; | |
160 | return 0; | |
161 | } | |
162 | ||
b4c70721 | 163 | static int io_subchannel_settle(void) |
8ea7f559 | 164 | { |
b4c70721 SO |
165 | int ret; |
166 | ||
167 | ret = wait_event_interruptible(ccw_device_init_wq, | |
168 | atomic_read(&ccw_device_init_count) == 0); | |
169 | if (ret) | |
170 | return -EINTR; | |
be5d3823 | 171 | flush_workqueue(cio_work_q); |
b4c70721 | 172 | return 0; |
8ea7f559 SO |
173 | } |
174 | ||
f7e5d67c | 175 | static struct css_driver io_subchannel_driver = { |
e6aed122 SO |
176 | .drv = { |
177 | .owner = THIS_MODULE, | |
178 | .name = "io_subchannel", | |
179 | }, | |
f08adc00 | 180 | .subchannel_type = io_subchannel_ids, |
1da177e4 | 181 | .irq = io_subchannel_irq, |
c820de39 CH |
182 | .sch_event = io_subchannel_sch_event, |
183 | .chp_event = io_subchannel_chp_event, | |
8bbace7e CH |
184 | .probe = io_subchannel_probe, |
185 | .remove = io_subchannel_remove, | |
186 | .shutdown = io_subchannel_shutdown, | |
93a27592 | 187 | .prepare = io_subchannel_prepare, |
8ea7f559 | 188 | .settle = io_subchannel_settle, |
1da177e4 LT |
189 | }; |
190 | ||
2f17644d | 191 | int __init io_subchannel_init(void) |
1da177e4 LT |
192 | { |
193 | int ret; | |
194 | ||
90ab1336 | 195 | setup_timer(&recovery_timer, recovery_func, 0); |
be5d3823 SO |
196 | ret = bus_register(&ccw_bus_type); |
197 | if (ret) | |
198 | return ret; | |
25b7bb58 CH |
199 | ret = css_driver_register(&io_subchannel_driver); |
200 | if (ret) | |
be5d3823 | 201 | bus_unregister(&ccw_bus_type); |
1da177e4 | 202 | |
1da177e4 LT |
203 | return ret; |
204 | } | |
205 | ||
1da177e4 LT |
206 | |
207 | /************************ device handling **************************/ | |
208 | ||
209 | /* | |
210 | * A ccw_device has some interfaces in sysfs in addition to the | |
211 | * standard ones. | |
212 | * The following entries are designed to export the information which | |
213 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
214 | * are obvious, so they don't have an entry :) | |
215 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
216 | */ | |
217 | static ssize_t | |
3fd3c0a5 | 218 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
219 | { |
220 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 221 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
222 | ssize_t ret = 0; |
223 | int chp; | |
7ad6a249 PO |
224 | int mask; |
225 | ||
226 | for (chp = 0; chp < 8; chp++) { | |
227 | mask = 0x80 >> chp; | |
228 | if (ssd->path_mask & mask) | |
229 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
230 | else | |
231 | ret += sprintf(buf + ret, "00 "); | |
232 | } | |
1da177e4 LT |
233 | ret += sprintf (buf+ret, "\n"); |
234 | return min((ssize_t)PAGE_SIZE, ret); | |
235 | } | |
236 | ||
237 | static ssize_t | |
3fd3c0a5 | 238 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
239 | { |
240 | struct subchannel *sch = to_subchannel(dev); | |
241 | struct pmcw *pmcw = &sch->schib.pmcw; | |
242 | ||
243 | return sprintf (buf, "%02x %02x %02x\n", | |
244 | pmcw->pim, pmcw->pam, pmcw->pom); | |
245 | } | |
246 | ||
247 | static ssize_t | |
3fd3c0a5 | 248 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
249 | { |
250 | struct ccw_device *cdev = to_ccwdev(dev); | |
251 | struct ccw_device_id *id = &(cdev->id); | |
252 | ||
253 | if (id->dev_type != 0) | |
254 | return sprintf(buf, "%04x/%02x\n", | |
255 | id->dev_type, id->dev_model); | |
256 | else | |
257 | return sprintf(buf, "n/a\n"); | |
258 | } | |
259 | ||
260 | static ssize_t | |
3fd3c0a5 | 261 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
262 | { |
263 | struct ccw_device *cdev = to_ccwdev(dev); | |
264 | struct ccw_device_id *id = &(cdev->id); | |
265 | ||
266 | return sprintf(buf, "%04x/%02x\n", | |
267 | id->cu_type, id->cu_model); | |
268 | } | |
269 | ||
f1fc78a8 BB |
270 | static ssize_t |
271 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
272 | { | |
273 | struct ccw_device *cdev = to_ccwdev(dev); | |
274 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 275 | int len; |
f1fc78a8 | 276 | |
086a6c62 | 277 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
278 | |
279 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
280 | } |
281 | ||
1da177e4 | 282 | static ssize_t |
3fd3c0a5 | 283 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
284 | { |
285 | struct ccw_device *cdev = to_ccwdev(dev); | |
286 | ||
287 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
288 | } | |
289 | ||
d7b5a4c9 CH |
290 | int ccw_device_is_orphan(struct ccw_device *cdev) |
291 | { | |
292 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
293 | } | |
294 | ||
ef99516c | 295 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 296 | { |
7d253b9a | 297 | if (device_is_registered(&cdev->dev)) { |
24a1872d | 298 | /* Undo device_add(). */ |
ef99516c | 299 | device_del(&cdev->dev); |
24a1872d SO |
300 | } |
301 | if (cdev->private->flags.initialized) { | |
302 | cdev->private->flags.initialized = 0; | |
3b554a14 SO |
303 | /* Release reference from device_initialize(). */ |
304 | put_device(&cdev->dev); | |
305 | } | |
7674da77 CH |
306 | } |
307 | ||
d40f7b75 SO |
308 | static void io_subchannel_quiesce(struct subchannel *); |
309 | ||
b2ffd8e9 CH |
310 | /** |
311 | * ccw_device_set_offline() - disable a ccw device for I/O | |
312 | * @cdev: target ccw device | |
313 | * | |
314 | * This function calls the driver's set_offline() function for @cdev, if | |
315 | * given, and then disables @cdev. | |
316 | * Returns: | |
317 | * %0 on success and a negative error value on failure. | |
318 | * Context: | |
319 | * enabled, ccw device lock not held | |
320 | */ | |
321 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 | 322 | { |
d40f7b75 SO |
323 | struct subchannel *sch; |
324 | int ret, state; | |
1da177e4 LT |
325 | |
326 | if (!cdev) | |
327 | return -ENODEV; | |
328 | if (!cdev->online || !cdev->drv) | |
329 | return -EINVAL; | |
330 | ||
331 | if (cdev->drv->set_offline) { | |
332 | ret = cdev->drv->set_offline(cdev); | |
333 | if (ret != 0) | |
334 | return ret; | |
335 | } | |
1da177e4 | 336 | spin_lock_irq(cdev->ccwlock); |
d40f7b75 | 337 | sch = to_subchannel(cdev->dev.parent); |
74bd0d85 | 338 | cdev->online = 0; |
217ee6c6 ME |
339 | /* Wait until a final state or DISCONNECTED is reached */ |
340 | while (!dev_fsm_final_state(cdev) && | |
341 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
1da177e4 | 342 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
343 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
344 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
345 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 | 346 | } |
d40f7b75 SO |
347 | do { |
348 | ret = ccw_device_offline(cdev); | |
349 | if (!ret) | |
350 | break; | |
351 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device " | |
352 | "0.%x.%04x\n", ret, cdev->private->dev_id.ssid, | |
353 | cdev->private->dev_id.devno); | |
354 | if (ret != -EBUSY) | |
355 | goto error; | |
356 | state = cdev->private->state; | |
357 | spin_unlock_irq(cdev->ccwlock); | |
358 | io_subchannel_quiesce(sch); | |
359 | spin_lock_irq(cdev->ccwlock); | |
360 | cdev->private->state = state; | |
361 | } while (ret == -EBUSY); | |
1da177e4 | 362 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
363 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
364 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
a7ae2c02 PO |
365 | /* Inform the user if set offline failed. */ |
366 | if (cdev->private->state == DEV_STATE_BOXED) { | |
367 | pr_warning("%s: The device entered boxed state while " | |
368 | "being set offline\n", dev_name(&cdev->dev)); | |
369 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
370 | pr_warning("%s: The device stopped operating while " | |
371 | "being set offline\n", dev_name(&cdev->dev)); | |
372 | } | |
217ee6c6 ME |
373 | /* Give up reference from ccw_device_set_online(). */ |
374 | put_device(&cdev->dev); | |
375 | return 0; | |
376 | ||
377 | error: | |
217ee6c6 ME |
378 | cdev->private->state = DEV_STATE_OFFLINE; |
379 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
380 | spin_unlock_irq(cdev->ccwlock); | |
381 | /* Give up reference from ccw_device_set_online(). */ | |
382 | put_device(&cdev->dev); | |
383 | return -ENODEV; | |
1da177e4 LT |
384 | } |
385 | ||
b2ffd8e9 CH |
386 | /** |
387 | * ccw_device_set_online() - enable a ccw device for I/O | |
388 | * @cdev: target ccw device | |
389 | * | |
390 | * This function first enables @cdev and then calls the driver's set_online() | |
391 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
392 | * disabled again. | |
393 | * Returns: | |
394 | * %0 on success and a negative error value on failure. | |
395 | * Context: | |
396 | * enabled, ccw device lock not held | |
397 | */ | |
398 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
399 | { |
400 | int ret; | |
217ee6c6 | 401 | int ret2; |
1da177e4 LT |
402 | |
403 | if (!cdev) | |
404 | return -ENODEV; | |
405 | if (cdev->online || !cdev->drv) | |
406 | return -EINVAL; | |
9cd67421 CH |
407 | /* Hold on to an extra reference while device is online. */ |
408 | if (!get_device(&cdev->dev)) | |
409 | return -ENODEV; | |
1da177e4 LT |
410 | |
411 | spin_lock_irq(cdev->ccwlock); | |
412 | ret = ccw_device_online(cdev); | |
413 | spin_unlock_irq(cdev->ccwlock); | |
414 | if (ret == 0) | |
415 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
416 | else { | |
139b83dd | 417 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
418 | "device 0.%x.%04x\n", |
419 | ret, cdev->private->dev_id.ssid, | |
420 | cdev->private->dev_id.devno); | |
9cd67421 CH |
421 | /* Give up online reference since onlining failed. */ |
422 | put_device(&cdev->dev); | |
1da177e4 LT |
423 | return ret; |
424 | } | |
217ee6c6 ME |
425 | spin_lock_irq(cdev->ccwlock); |
426 | /* Check if online processing was successful */ | |
427 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
428 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
429 | spin_unlock_irq(cdev->ccwlock); | |
a7ae2c02 PO |
430 | /* Inform the user that set online failed. */ |
431 | if (cdev->private->state == DEV_STATE_BOXED) { | |
432 | pr_warning("%s: Setting the device online failed " | |
433 | "because it is boxed\n", | |
434 | dev_name(&cdev->dev)); | |
435 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
436 | pr_warning("%s: Setting the device online failed " | |
437 | "because it is not operational\n", | |
438 | dev_name(&cdev->dev)); | |
439 | } | |
9cd67421 CH |
440 | /* Give up online reference since onlining failed. */ |
441 | put_device(&cdev->dev); | |
1da177e4 | 442 | return -ENODEV; |
9cd67421 | 443 | } |
217ee6c6 ME |
444 | spin_unlock_irq(cdev->ccwlock); |
445 | if (cdev->drv->set_online) | |
446 | ret = cdev->drv->set_online(cdev); | |
447 | if (ret) | |
448 | goto rollback; | |
74bd0d85 SO |
449 | |
450 | spin_lock_irq(cdev->ccwlock); | |
217ee6c6 | 451 | cdev->online = 1; |
74bd0d85 | 452 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
453 | return 0; |
454 | ||
455 | rollback: | |
1da177e4 | 456 | spin_lock_irq(cdev->ccwlock); |
217ee6c6 ME |
457 | /* Wait until a final state or DISCONNECTED is reached */ |
458 | while (!dev_fsm_final_state(cdev) && | |
459 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
460 | spin_unlock_irq(cdev->ccwlock); | |
461 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
462 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
463 | spin_lock_irq(cdev->ccwlock); | |
464 | } | |
465 | ret2 = ccw_device_offline(cdev); | |
466 | if (ret2) | |
467 | goto error; | |
468 | spin_unlock_irq(cdev->ccwlock); | |
469 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
470 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
471 | /* Give up online reference since onlining failed. */ | |
472 | put_device(&cdev->dev); | |
473 | return ret; | |
474 | ||
475 | error: | |
476 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
477 | "device 0.%x.%04x\n", | |
478 | ret2, cdev->private->dev_id.ssid, | |
479 | cdev->private->dev_id.devno); | |
480 | cdev->private->state = DEV_STATE_OFFLINE; | |
1da177e4 | 481 | spin_unlock_irq(cdev->ccwlock); |
9cd67421 CH |
482 | /* Give up online reference since onlining failed. */ |
483 | put_device(&cdev->dev); | |
217ee6c6 | 484 | return ret; |
1da177e4 LT |
485 | } |
486 | ||
e74fe0ce | 487 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 | 488 | { |
37de53bb PO |
489 | if (cdev->private->state == DEV_STATE_DISCONNECTED) { |
490 | spin_lock_irq(cdev->ccwlock); | |
491 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); | |
492 | spin_unlock_irq(cdev->ccwlock); | |
7cd40314 SO |
493 | return 0; |
494 | } | |
495 | if (cdev->drv && cdev->drv->set_offline) | |
e74fe0ce | 496 | return ccw_device_set_offline(cdev); |
7cd40314 | 497 | return -EINVAL; |
f5ba6c86 CH |
498 | } |
499 | ||
500 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
501 | { | |
f5ba6c86 | 502 | /* Do device recognition, if needed. */ |
99f6a570 | 503 | if (cdev->private->state == DEV_STATE_BOXED) { |
1f5bd384 | 504 | spin_lock_irq(cdev->ccwlock); |
736b5db8 | 505 | ccw_device_recognition(cdev); |
1f5bd384 | 506 | spin_unlock_irq(cdev->ccwlock); |
f5ba6c86 CH |
507 | wait_event(cdev->private->wait_q, |
508 | cdev->private->flags.recog_done); | |
156013ff SO |
509 | if (cdev->private->state != DEV_STATE_OFFLINE) |
510 | /* recognition failed */ | |
511 | return -EAGAIN; | |
f5ba6c86 CH |
512 | } |
513 | if (cdev->drv && cdev->drv->set_online) | |
7cd40314 SO |
514 | return ccw_device_set_online(cdev); |
515 | return -EINVAL; | |
f5ba6c86 | 516 | } |
156013ff | 517 | |
c78aa6cb | 518 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
519 | { |
520 | int ret; | |
521 | ||
522 | ret = online_store_recog_and_online(cdev); | |
156013ff | 523 | if (ret && !force) |
c78aa6cb | 524 | return ret; |
f5ba6c86 CH |
525 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
526 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
527 | if (ret) |
528 | return ret; | |
f5ba6c86 CH |
529 | if (cdev->id.cu_type == 0) |
530 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
531 | ret = online_store_recog_and_online(cdev); |
532 | if (ret) | |
533 | return ret; | |
f5ba6c86 | 534 | } |
c78aa6cb | 535 | return 0; |
f5ba6c86 CH |
536 | } |
537 | ||
538 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
539 | const char *buf, size_t count) | |
1da177e4 LT |
540 | { |
541 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
542 | int force, ret; |
543 | unsigned long i; | |
1da177e4 | 544 | |
a2fc8485 | 545 | /* Prevent conflict between multiple on-/offline processing requests. */ |
350e9120 | 546 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
1da177e4 | 547 | return -EAGAIN; |
a2fc8485 PO |
548 | /* Prevent conflict between internal I/Os and on-/offline processing. */ |
549 | if (!dev_fsm_final_state(cdev) && | |
550 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
551 | ret = -EAGAIN; | |
00381eeb | 552 | goto out; |
a2fc8485 PO |
553 | } |
554 | /* Prevent conflict between pending work and on-/offline processing.*/ | |
555 | if (work_pending(&cdev->private->todo_work)) { | |
556 | ret = -EAGAIN; | |
00381eeb | 557 | goto out; |
1da177e4 LT |
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; | |
0178722b | 565 | ret = kstrtoul(buf, 16, &i); |
1da177e4 | 566 | } |
2f972202 CH |
567 | if (ret) |
568 | goto out; | |
00381eeb SO |
569 | |
570 | device_lock(dev); | |
f5ba6c86 CH |
571 | switch (i) { |
572 | case 0: | |
e74fe0ce | 573 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
574 | break; |
575 | case 1: | |
c78aa6cb | 576 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
577 | break; |
578 | default: | |
2f972202 | 579 | ret = -EINVAL; |
1da177e4 | 580 | } |
00381eeb SO |
581 | device_unlock(dev); |
582 | ||
2f972202 | 583 | out: |
1da177e4 | 584 | atomic_set(&cdev->private->onoff, 0); |
e74fe0ce | 585 | return (ret < 0) ? ret : count; |
1da177e4 LT |
586 | } |
587 | ||
588 | static ssize_t | |
3fd3c0a5 | 589 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
590 | { |
591 | struct ccw_device *cdev = to_ccwdev(dev); | |
592 | struct subchannel *sch; | |
593 | ||
d7b5a4c9 CH |
594 | if (ccw_device_is_orphan(cdev)) |
595 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
596 | switch (cdev->private->state) { |
597 | case DEV_STATE_BOXED: | |
598 | return sprintf(buf, "boxed\n"); | |
599 | case DEV_STATE_DISCONNECTED: | |
600 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
601 | case DEV_STATE_NOT_OPER: | |
602 | sch = to_subchannel(dev->parent); | |
603 | if (!sch->lpm) | |
604 | return sprintf(buf, "no path\n"); | |
605 | else | |
606 | return sprintf(buf, "no device\n"); | |
607 | default: | |
608 | /* All other states considered fine. */ | |
609 | return sprintf(buf, "good\n"); | |
610 | } | |
611 | } | |
612 | ||
fd0457a6 ME |
613 | static ssize_t |
614 | initiate_logging(struct device *dev, struct device_attribute *attr, | |
615 | const char *buf, size_t count) | |
616 | { | |
617 | struct subchannel *sch = to_subchannel(dev); | |
618 | int rc; | |
619 | ||
620 | rc = chsc_siosl(sch->schid); | |
621 | if (rc < 0) { | |
622 | pr_warning("Logging for subchannel 0.%x.%04x failed with " | |
623 | "errno=%d\n", | |
624 | sch->schid.ssid, sch->schid.sch_no, rc); | |
625 | return rc; | |
626 | } | |
627 | pr_notice("Logging for subchannel 0.%x.%04x was triggered\n", | |
628 | sch->schid.ssid, sch->schid.sch_no); | |
629 | return count; | |
630 | } | |
631 | ||
84c57ad5 SO |
632 | static ssize_t vpm_show(struct device *dev, struct device_attribute *attr, |
633 | char *buf) | |
634 | { | |
635 | struct subchannel *sch = to_subchannel(dev); | |
636 | ||
637 | return sprintf(buf, "%02x\n", sch->vpm); | |
638 | } | |
639 | ||
1da177e4 LT |
640 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); |
641 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
642 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
643 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 644 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 645 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 | 646 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
fd0457a6 | 647 | static DEVICE_ATTR(logging, 0200, NULL, initiate_logging); |
84c57ad5 | 648 | static DEVICE_ATTR(vpm, 0444, vpm_show, NULL); |
1da177e4 | 649 | |
7e9db9ea | 650 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
651 | &dev_attr_chpids.attr, |
652 | &dev_attr_pimpampom.attr, | |
fd0457a6 | 653 | &dev_attr_logging.attr, |
84c57ad5 | 654 | &dev_attr_vpm.attr, |
1da177e4 LT |
655 | NULL, |
656 | }; | |
657 | ||
7e9db9ea CH |
658 | static struct attribute_group io_subchannel_attr_group = { |
659 | .attrs = io_subchannel_attrs, | |
529192f3 | 660 | }; |
1da177e4 LT |
661 | |
662 | static struct attribute * ccwdev_attrs[] = { | |
663 | &dev_attr_devtype.attr, | |
664 | &dev_attr_cutype.attr, | |
f1fc78a8 | 665 | &dev_attr_modalias.attr, |
1da177e4 LT |
666 | &dev_attr_online.attr, |
667 | &dev_attr_cmb_enable.attr, | |
668 | &dev_attr_availability.attr, | |
669 | NULL, | |
670 | }; | |
671 | ||
672 | static struct attribute_group ccwdev_attr_group = { | |
673 | .attrs = ccwdev_attrs, | |
674 | }; | |
675 | ||
a4dbd674 | 676 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
677 | &ccwdev_attr_group, |
678 | NULL, | |
679 | }; | |
1da177e4 | 680 | |
2c3e7e15 | 681 | static int ccw_device_add(struct ccw_device *cdev) |
1da177e4 LT |
682 | { |
683 | struct device *dev = &cdev->dev; | |
1da177e4 LT |
684 | |
685 | dev->bus = &ccw_bus_type; | |
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 | { | |
2c3e7e15 SO |
760 | struct ccw_device_private *priv = cdev->private; |
761 | int ret; | |
762 | ||
763 | priv->cdev = cdev; | |
764 | priv->int_class = IRQIO_CIO; | |
765 | priv->state = DEV_STATE_NOT_OPER; | |
766 | priv->dev_id.devno = sch->schib.pmcw.dev; | |
767 | priv->dev_id.ssid = sch->schid.ssid; | |
768 | priv->schid = sch->schid; | |
769 | ||
770 | INIT_WORK(&priv->todo_work, ccw_device_todo); | |
771 | INIT_LIST_HEAD(&priv->cmb_list); | |
772 | init_waitqueue_head(&priv->wait_q); | |
773 | init_timer(&priv->timer); | |
774 | ||
775 | atomic_set(&priv->onoff, 0); | |
776 | cdev->ccwlock = sch->lock; | |
7674da77 CH |
777 | cdev->dev.parent = &sch->dev; |
778 | cdev->dev.release = ccw_device_release; | |
ef99516c | 779 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
780 | /* Do first half of device_register. */ |
781 | device_initialize(&cdev->dev); | |
2c3e7e15 SO |
782 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
783 | cdev->private->dev_id.devno); | |
784 | if (ret) | |
785 | goto out_put; | |
7674da77 | 786 | if (!get_device(&sch->dev)) { |
2c3e7e15 SO |
787 | ret = -ENODEV; |
788 | goto out_put; | |
7674da77 | 789 | } |
2c3e7e15 SO |
790 | priv->flags.initialized = 1; |
791 | spin_lock_irq(sch->lock); | |
792 | sch_set_cdev(sch, cdev); | |
793 | spin_unlock_irq(sch->lock); | |
7674da77 | 794 | return 0; |
2c3e7e15 SO |
795 | |
796 | out_put: | |
797 | /* Release reference from device_initialize(). */ | |
798 | put_device(&cdev->dev); | |
799 | return ret; | |
7674da77 CH |
800 | } |
801 | ||
802 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
803 | { | |
804 | struct ccw_device *cdev; | |
805 | int ret; | |
806 | ||
807 | cdev = io_subchannel_allocate_dev(sch); | |
808 | if (!IS_ERR(cdev)) { | |
809 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 810 | if (ret) |
7674da77 | 811 | cdev = ERR_PTR(ret); |
7674da77 CH |
812 | } |
813 | return cdev; | |
814 | } | |
815 | ||
736b5db8 | 816 | static void io_subchannel_recog(struct ccw_device *, struct subchannel *); |
d7b5a4c9 | 817 | |
d7b5a4c9 CH |
818 | static void sch_create_and_recog_new_device(struct subchannel *sch) |
819 | { | |
820 | struct ccw_device *cdev; | |
821 | ||
822 | /* Need to allocate a new ccw device. */ | |
823 | cdev = io_subchannel_create_ccwdev(sch); | |
824 | if (IS_ERR(cdev)) { | |
825 | /* OK, we did everything we could... */ | |
826 | css_sch_device_unregister(sch); | |
827 | return; | |
828 | } | |
d7b5a4c9 | 829 | /* Start recognition for the new ccw device. */ |
736b5db8 | 830 | io_subchannel_recog(cdev, sch); |
d7b5a4c9 CH |
831 | } |
832 | ||
1da177e4 LT |
833 | /* |
834 | * Register recognized device. | |
835 | */ | |
37de53bb | 836 | static void io_subchannel_register(struct ccw_device *cdev) |
1da177e4 | 837 | { |
1da177e4 | 838 | struct subchannel *sch; |
a290156f | 839 | int ret, adjust_init_count = 1; |
1da177e4 LT |
840 | unsigned long flags; |
841 | ||
1da177e4 | 842 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
843 | /* |
844 | * Check if subchannel is still registered. It may have become | |
845 | * unregistered if a machine check hit us after finishing | |
846 | * device recognition but before the register work could be | |
847 | * queued. | |
848 | */ | |
849 | if (!device_is_registered(&sch->dev)) | |
850 | goto out_err; | |
82b7ac05 | 851 | css_update_ssd_info(sch); |
47af5518 CH |
852 | /* |
853 | * io_subchannel_register() will also be called after device | |
854 | * recognition has been done for a boxed device (which will already | |
855 | * be registered). We need to reprobe since we may now have sense id | |
856 | * information. | |
857 | */ | |
d6a30761 | 858 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
859 | if (!cdev->drv) { |
860 | ret = device_reprobe(&cdev->dev); | |
861 | if (ret) | |
862 | /* We can't do much here. */ | |
139b83dd | 863 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
864 | " %d for 0.%x.%04x\n", ret, |
865 | cdev->private->dev_id.ssid, | |
866 | cdev->private->dev_id.devno); | |
47af5518 | 867 | } |
a290156f | 868 | adjust_init_count = 0; |
1da177e4 LT |
869 | goto out; |
870 | } | |
fa1a8c23 CH |
871 | /* |
872 | * Now we know this subchannel will stay, we can throw | |
873 | * our delayed uevent. | |
874 | */ | |
f67f129e | 875 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 876 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 | 877 | /* make it known to the system */ |
2c3e7e15 | 878 | ret = ccw_device_add(cdev); |
1da177e4 | 879 | if (ret) { |
e556bbbd CH |
880 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
881 | cdev->private->dev_id.ssid, | |
882 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 883 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 884 | sch_set_cdev(sch, NULL); |
2ec22984 | 885 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
886 | /* Release initial device reference. */ |
887 | put_device(&cdev->dev); | |
5fb6b854 | 888 | goto out_err; |
1da177e4 | 889 | } |
1da177e4 LT |
890 | out: |
891 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 892 | wake_up(&cdev->private->wait_q); |
5fb6b854 | 893 | out_err: |
a290156f | 894 | if (adjust_init_count && atomic_dec_and_test(&ccw_device_init_count)) |
1da177e4 LT |
895 | wake_up(&ccw_device_init_wq); |
896 | } | |
897 | ||
37de53bb | 898 | static void ccw_device_call_sch_unregister(struct ccw_device *cdev) |
1da177e4 | 899 | { |
1da177e4 LT |
900 | struct subchannel *sch; |
901 | ||
46fbe4e4 PO |
902 | /* Get subchannel reference for local processing. */ |
903 | if (!get_device(cdev->dev.parent)) | |
904 | return; | |
1da177e4 | 905 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 906 | css_sch_device_unregister(sch); |
46fbe4e4 | 907 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
908 | put_device(&sch->dev); |
909 | } | |
910 | ||
911 | /* | |
912 | * subchannel recognition done. Called from the state machine. | |
913 | */ | |
914 | void | |
915 | io_subchannel_recog_done(struct ccw_device *cdev) | |
916 | { | |
1da177e4 LT |
917 | if (css_init_done == 0) { |
918 | cdev->private->flags.recog_done = 1; | |
919 | return; | |
920 | } | |
921 | switch (cdev->private->state) { | |
47593bfa SO |
922 | case DEV_STATE_BOXED: |
923 | /* Device did not respond in time. */ | |
1da177e4 LT |
924 | case DEV_STATE_NOT_OPER: |
925 | cdev->private->flags.recog_done = 1; | |
37de53bb PO |
926 | /* Remove device found not operational. */ |
927 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1da177e4 LT |
928 | if (atomic_dec_and_test(&ccw_device_init_count)) |
929 | wake_up(&ccw_device_init_wq); | |
930 | break; | |
1da177e4 LT |
931 | case DEV_STATE_OFFLINE: |
932 | /* | |
933 | * We can't register the device in interrupt context so | |
934 | * we schedule a work item. | |
935 | */ | |
37de53bb | 936 | ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER); |
1da177e4 LT |
937 | break; |
938 | } | |
939 | } | |
940 | ||
736b5db8 | 941 | static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) |
1da177e4 | 942 | { |
1da177e4 LT |
943 | /* Increase counter of devices currently in recognition. */ |
944 | atomic_inc(&ccw_device_init_count); | |
945 | ||
946 | /* Start async. device sensing. */ | |
2ec22984 | 947 | spin_lock_irq(sch->lock); |
736b5db8 | 948 | ccw_device_recognition(cdev); |
2ec22984 | 949 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
950 | } |
951 | ||
5d6e6b6f PO |
952 | static int ccw_device_move_to_sch(struct ccw_device *cdev, |
953 | struct subchannel *sch) | |
d7b5a4c9 | 954 | { |
5d6e6b6f | 955 | struct subchannel *old_sch; |
0c609fca | 956 | int rc, old_enabled = 0; |
d7b5a4c9 | 957 | |
5d6e6b6f PO |
958 | old_sch = to_subchannel(cdev->dev.parent); |
959 | /* Obtain child reference for new parent. */ | |
6eff208f | 960 | if (!get_device(&sch->dev)) |
5d6e6b6f | 961 | return -ENODEV; |
0c609fca SO |
962 | |
963 | if (!sch_is_pseudo_sch(old_sch)) { | |
964 | spin_lock_irq(old_sch->lock); | |
965 | old_enabled = old_sch->schib.pmcw.ena; | |
966 | rc = 0; | |
967 | if (old_enabled) | |
968 | rc = cio_disable_subchannel(old_sch); | |
969 | spin_unlock_irq(old_sch->lock); | |
970 | if (rc == -EBUSY) { | |
971 | /* Release child reference for new parent. */ | |
972 | put_device(&sch->dev); | |
973 | return rc; | |
974 | } | |
975 | } | |
976 | ||
d7b5a4c9 | 977 | mutex_lock(&sch->reg_mutex); |
ffa6a705 | 978 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
979 | mutex_unlock(&sch->reg_mutex); |
980 | if (rc) { | |
5d6e6b6f | 981 | CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", |
d7b5a4c9 CH |
982 | cdev->private->dev_id.ssid, |
983 | cdev->private->dev_id.devno, sch->schid.ssid, | |
5d6e6b6f | 984 | sch->schib.pmcw.dev, rc); |
0c609fca SO |
985 | if (old_enabled) { |
986 | /* Try to reenable the old subchannel. */ | |
987 | spin_lock_irq(old_sch->lock); | |
988 | cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch); | |
989 | spin_unlock_irq(old_sch->lock); | |
990 | } | |
5d6e6b6f | 991 | /* Release child reference for new parent. */ |
6eff208f | 992 | put_device(&sch->dev); |
5d6e6b6f | 993 | return rc; |
d7b5a4c9 | 994 | } |
5d6e6b6f PO |
995 | /* Clean up old subchannel. */ |
996 | if (!sch_is_pseudo_sch(old_sch)) { | |
997 | spin_lock_irq(old_sch->lock); | |
998 | sch_set_cdev(old_sch, NULL); | |
5d6e6b6f PO |
999 | spin_unlock_irq(old_sch->lock); |
1000 | css_schedule_eval(old_sch->schid); | |
d7b5a4c9 | 1001 | } |
5d6e6b6f PO |
1002 | /* Release child reference for old parent. */ |
1003 | put_device(&old_sch->dev); | |
1004 | /* Initialize new subchannel. */ | |
1005 | spin_lock_irq(sch->lock); | |
1006 | cdev->private->schid = sch->schid; | |
1007 | cdev->ccwlock = sch->lock; | |
1008 | if (!sch_is_pseudo_sch(sch)) | |
1009 | sch_set_cdev(sch, cdev); | |
1010 | spin_unlock_irq(sch->lock); | |
1011 | if (!sch_is_pseudo_sch(sch)) | |
1012 | css_update_ssd_info(sch); | |
1013 | return 0; | |
1014 | } | |
1015 | ||
1016 | static int ccw_device_move_to_orph(struct ccw_device *cdev) | |
1017 | { | |
1018 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1019 | struct channel_subsystem *css = to_css(sch->dev.parent); | |
1020 | ||
1021 | return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); | |
d7b5a4c9 CH |
1022 | } |
1023 | ||
602b20f2 CH |
1024 | static void io_subchannel_irq(struct subchannel *sch) |
1025 | { | |
1026 | struct ccw_device *cdev; | |
1027 | ||
db6a6423 | 1028 | cdev = sch_get_cdev(sch); |
602b20f2 | 1029 | |
efd986db SO |
1030 | CIO_TRACE_EVENT(6, "IRQ"); |
1031 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
1032 | if (cdev) |
1033 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
de400d6b | 1034 | else |
420f42ec | 1035 | inc_irq_stat(IRQIO_CIO); |
602b20f2 CH |
1036 | } |
1037 | ||
13952ec1 SO |
1038 | void io_subchannel_init_config(struct subchannel *sch) |
1039 | { | |
1040 | memset(&sch->config, 0, sizeof(sch->config)); | |
1041 | sch->config.csense = 1; | |
13952ec1 SO |
1042 | } |
1043 | ||
0ae7a7b2 CH |
1044 | static void io_subchannel_init_fields(struct subchannel *sch) |
1045 | { | |
1046 | if (cio_is_console(sch->schid)) | |
1047 | sch->opm = 0xff; | |
1048 | else | |
1049 | sch->opm = chp_get_sch_opm(sch); | |
1050 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1051 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1052 | |
1053 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1054 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1055 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1056 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1057 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
1058 | |
1059 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1060 | } |
1061 | ||
90ed2b69 CH |
1062 | /* |
1063 | * Note: We always return 0 so that we bind to the device even on error. | |
1064 | * This is needed so that our remove function is called on unregister. | |
1065 | */ | |
0ae7a7b2 | 1066 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1067 | { |
f92519e8 | 1068 | struct io_subchannel_private *io_priv; |
1da177e4 LT |
1069 | struct ccw_device *cdev; |
1070 | int rc; | |
1da177e4 | 1071 | |
6d7c5afc | 1072 | if (cio_is_console(sch->schid)) { |
7e9db9ea CH |
1073 | rc = sysfs_create_group(&sch->dev.kobj, |
1074 | &io_subchannel_attr_group); | |
1075 | if (rc) | |
1076 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1077 | "attributes for subchannel " | |
1078 | "0.%x.%04x (rc=%d)\n", | |
1079 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 | 1080 | /* |
6d7c5afc | 1081 | * The console subchannel already has an associated ccw_device. |
7e9db9ea | 1082 | * Throw the delayed uevent for the subchannel, register |
6d7c5afc | 1083 | * the ccw_device and exit. |
1da177e4 | 1084 | */ |
f67f129e | 1085 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1086 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
6d7c5afc | 1087 | cdev = sch_get_cdev(sch); |
2c3e7e15 | 1088 | rc = ccw_device_add(cdev); |
afdfed0f SO |
1089 | if (rc) { |
1090 | /* Release online reference. */ | |
1091 | put_device(&cdev->dev); | |
1092 | goto out_schedule; | |
1093 | } | |
0ad8f714 SO |
1094 | if (atomic_dec_and_test(&ccw_device_init_count)) |
1095 | wake_up(&ccw_device_init_wq); | |
1da177e4 LT |
1096 | return 0; |
1097 | } | |
0ae7a7b2 | 1098 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1099 | rc = cio_commit_config(sch); |
1100 | if (rc) | |
1101 | goto out_schedule; | |
7e9db9ea CH |
1102 | rc = sysfs_create_group(&sch->dev.kobj, |
1103 | &io_subchannel_attr_group); | |
1104 | if (rc) | |
90ed2b69 | 1105 | goto out_schedule; |
cd6b4f27 | 1106 | /* Allocate I/O subchannel private data. */ |
f92519e8 SO |
1107 | io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); |
1108 | if (!io_priv) | |
48e4c385 | 1109 | goto out_schedule; |
f92519e8 SO |
1110 | |
1111 | set_io_private(sch, io_priv); | |
5d6e6b6f | 1112 | css_schedule_eval(sch->schid); |
7e9db9ea | 1113 | return 0; |
48e4c385 | 1114 | |
90ed2b69 | 1115 | out_schedule: |
390935ac PO |
1116 | spin_lock_irq(sch->lock); |
1117 | css_sched_sch_todo(sch, SCH_TODO_UNREG); | |
1118 | spin_unlock_irq(sch->lock); | |
90ed2b69 | 1119 | return 0; |
1da177e4 LT |
1120 | } |
1121 | ||
1da177e4 | 1122 | static int |
8bbace7e | 1123 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 | 1124 | { |
f92519e8 | 1125 | struct io_subchannel_private *io_priv = to_io_private(sch); |
1da177e4 | 1126 | struct ccw_device *cdev; |
1da177e4 | 1127 | |
db6a6423 CH |
1128 | cdev = sch_get_cdev(sch); |
1129 | if (!cdev) | |
48e4c385 | 1130 | goto out_free; |
6e9a0f67 | 1131 | io_subchannel_quiesce(sch); |
1da177e4 | 1132 | /* Set ccw device to not operational and drop reference. */ |
7a8ad100 | 1133 | spin_lock_irq(cdev->ccwlock); |
db6a6423 | 1134 | sch_set_cdev(sch, NULL); |
f92519e8 | 1135 | set_io_private(sch, NULL); |
1da177e4 | 1136 | cdev->private->state = DEV_STATE_NOT_OPER; |
7a8ad100 | 1137 | spin_unlock_irq(cdev->ccwlock); |
ef99516c | 1138 | ccw_device_unregister(cdev); |
48e4c385 | 1139 | out_free: |
f92519e8 | 1140 | kfree(io_priv); |
7e9db9ea | 1141 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1142 | return 0; |
1143 | } | |
1144 | ||
602b20f2 | 1145 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1146 | { |
1147 | struct ccw_device *cdev; | |
1148 | ||
db6a6423 | 1149 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1150 | if (cdev) |
1151 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1152 | } | |
1153 | ||
c820de39 CH |
1154 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1155 | { | |
1156 | struct ccw_device *cdev; | |
1157 | ||
1158 | cdev = sch_get_cdev(sch); | |
1159 | if (!cdev) | |
1160 | return; | |
4257aaec PO |
1161 | if (cio_update_schib(sch)) |
1162 | goto err; | |
1163 | /* Check for I/O on path. */ | |
1164 | if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask) | |
1165 | goto out; | |
1166 | if (cdev->private->state == DEV_STATE_ONLINE) { | |
1167 | ccw_device_kill_io(cdev); | |
1168 | goto out; | |
1169 | } | |
1170 | if (cio_clear(sch)) | |
1171 | goto err; | |
1172 | out: | |
1173 | /* Trigger path verification. */ | |
1174 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1175 | return; | |
c820de39 | 1176 | |
4257aaec PO |
1177 | err: |
1178 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
c820de39 CH |
1179 | } |
1180 | ||
99611f87 CH |
1181 | static int io_subchannel_chp_event(struct subchannel *sch, |
1182 | struct chp_link *link, int event) | |
c820de39 | 1183 | { |
585b954e | 1184 | struct ccw_device *cdev = sch_get_cdev(sch); |
c820de39 | 1185 | int mask; |
c820de39 | 1186 | |
99611f87 | 1187 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1188 | if (!mask) |
1189 | return 0; | |
1190 | switch (event) { | |
1191 | case CHP_VARY_OFF: | |
1192 | sch->opm &= ~mask; | |
1193 | sch->lpm &= ~mask; | |
585b954e SO |
1194 | if (cdev) |
1195 | cdev->private->path_gone_mask |= mask; | |
c820de39 CH |
1196 | io_subchannel_terminate_path(sch, mask); |
1197 | break; | |
1198 | case CHP_VARY_ON: | |
1199 | sch->opm |= mask; | |
1200 | sch->lpm |= mask; | |
585b954e SO |
1201 | if (cdev) |
1202 | cdev->private->path_new_mask |= mask; | |
c820de39 CH |
1203 | io_subchannel_verify(sch); |
1204 | break; | |
1205 | case CHP_OFFLINE: | |
cdb912a4 | 1206 | if (cio_update_schib(sch)) |
c820de39 | 1207 | return -ENODEV; |
585b954e SO |
1208 | if (cdev) |
1209 | cdev->private->path_gone_mask |= mask; | |
c820de39 CH |
1210 | io_subchannel_terminate_path(sch, mask); |
1211 | break; | |
1212 | case CHP_ONLINE: | |
cdb912a4 SO |
1213 | if (cio_update_schib(sch)) |
1214 | return -ENODEV; | |
c820de39 | 1215 | sch->lpm |= mask & sch->opm; |
585b954e SO |
1216 | if (cdev) |
1217 | cdev->private->path_new_mask |= mask; | |
c820de39 CH |
1218 | io_subchannel_verify(sch); |
1219 | break; | |
1220 | } | |
1221 | return 0; | |
1222 | } | |
1223 | ||
6e9a0f67 | 1224 | static void io_subchannel_quiesce(struct subchannel *sch) |
1da177e4 | 1225 | { |
1da177e4 LT |
1226 | struct ccw_device *cdev; |
1227 | int ret; | |
1228 | ||
56e6b796 | 1229 | spin_lock_irq(sch->lock); |
db6a6423 | 1230 | cdev = sch_get_cdev(sch); |
a8237fc4 | 1231 | if (cio_is_console(sch->schid)) |
56e6b796 | 1232 | goto out_unlock; |
1da177e4 | 1233 | if (!sch->schib.pmcw.ena) |
56e6b796 | 1234 | goto out_unlock; |
1da177e4 LT |
1235 | ret = cio_disable_subchannel(sch); |
1236 | if (ret != -EBUSY) | |
56e6b796 | 1237 | goto out_unlock; |
1da177e4 | 1238 | if (cdev->handler) |
56e6b796 SO |
1239 | cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO)); |
1240 | while (ret == -EBUSY) { | |
1241 | cdev->private->state = DEV_STATE_QUIESCE; | |
376ae475 | 1242 | cdev->private->iretry = 255; |
56e6b796 SO |
1243 | ret = ccw_device_cancel_halt_clear(cdev); |
1244 | if (ret == -EBUSY) { | |
1245 | ccw_device_set_timeout(cdev, HZ/10); | |
1246 | spin_unlock_irq(sch->lock); | |
1247 | wait_event(cdev->private->wait_q, | |
1248 | cdev->private->state != DEV_STATE_QUIESCE); | |
1249 | spin_lock_irq(sch->lock); | |
1250 | } | |
1251 | ret = cio_disable_subchannel(sch); | |
1da177e4 | 1252 | } |
56e6b796 SO |
1253 | out_unlock: |
1254 | spin_unlock_irq(sch->lock); | |
1da177e4 LT |
1255 | } |
1256 | ||
6e9a0f67 SO |
1257 | static void io_subchannel_shutdown(struct subchannel *sch) |
1258 | { | |
1259 | io_subchannel_quiesce(sch); | |
1260 | } | |
1261 | ||
c820de39 CH |
1262 | static int device_is_disconnected(struct ccw_device *cdev) |
1263 | { | |
1264 | if (!cdev) | |
1265 | return 0; | |
1266 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1267 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1268 | } | |
1269 | ||
1270 | static int recovery_check(struct device *dev, void *data) | |
1271 | { | |
1272 | struct ccw_device *cdev = to_ccwdev(dev); | |
1273 | int *redo = data; | |
1274 | ||
1275 | spin_lock_irq(cdev->ccwlock); | |
1276 | switch (cdev->private->state) { | |
1277 | case DEV_STATE_DISCONNECTED: | |
1278 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1279 | cdev->private->dev_id.ssid, | |
1280 | cdev->private->dev_id.devno); | |
1281 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1282 | *redo = 1; | |
1283 | break; | |
1284 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1285 | *redo = 1; | |
1286 | break; | |
1287 | } | |
1288 | spin_unlock_irq(cdev->ccwlock); | |
1289 | ||
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | static void recovery_work_func(struct work_struct *unused) | |
1294 | { | |
1295 | int redo = 0; | |
1296 | ||
1297 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1298 | if (redo) { | |
1299 | spin_lock_irq(&recovery_lock); | |
1300 | if (!timer_pending(&recovery_timer)) { | |
1301 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1302 | recovery_phase++; | |
1303 | mod_timer(&recovery_timer, jiffies + | |
1304 | recovery_delay[recovery_phase] * HZ); | |
1305 | } | |
1306 | spin_unlock_irq(&recovery_lock); | |
1307 | } else | |
1308 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1309 | } | |
1310 | ||
1311 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1312 | ||
1313 | static void recovery_func(unsigned long data) | |
1314 | { | |
1315 | /* | |
1316 | * We can't do our recovery in softirq context and it's not | |
1317 | * performance critical, so we schedule it. | |
1318 | */ | |
1319 | schedule_work(&recovery_work); | |
1320 | } | |
1321 | ||
1322 | static void ccw_device_schedule_recovery(void) | |
1323 | { | |
1324 | unsigned long flags; | |
1325 | ||
1326 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1327 | spin_lock_irqsave(&recovery_lock, flags); | |
1328 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1329 | recovery_phase = 0; | |
1330 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1331 | } | |
1332 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1333 | } | |
1334 | ||
ecf5d9ef PO |
1335 | static int purge_fn(struct device *dev, void *data) |
1336 | { | |
1337 | struct ccw_device *cdev = to_ccwdev(dev); | |
37de53bb | 1338 | struct ccw_dev_id *id = &cdev->private->dev_id; |
ecf5d9ef PO |
1339 | |
1340 | spin_lock_irq(cdev->ccwlock); | |
37de53bb | 1341 | if (is_blacklisted(id->ssid, id->devno) && |
a2fc8485 PO |
1342 | (cdev->private->state == DEV_STATE_OFFLINE) && |
1343 | (atomic_cmpxchg(&cdev->private->onoff, 0, 1) == 0)) { | |
37de53bb PO |
1344 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid, |
1345 | id->devno); | |
1346 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
a2fc8485 | 1347 | atomic_set(&cdev->private->onoff, 0); |
37de53bb | 1348 | } |
ecf5d9ef | 1349 | spin_unlock_irq(cdev->ccwlock); |
ecf5d9ef PO |
1350 | /* Abort loop in case of pending signal. */ |
1351 | if (signal_pending(current)) | |
1352 | return -EINTR; | |
1353 | ||
1354 | return 0; | |
1355 | } | |
1356 | ||
1357 | /** | |
1358 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1359 | * | |
1360 | * Unregister all ccw devices that are offline and on the blacklist. | |
1361 | */ | |
1362 | int ccw_purge_blacklisted(void) | |
1363 | { | |
1364 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1365 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1366 | return 0; | |
1367 | } | |
1368 | ||
6afcc775 | 1369 | void ccw_device_set_disconnected(struct ccw_device *cdev) |
c820de39 CH |
1370 | { |
1371 | if (!cdev) | |
1372 | return; | |
1373 | ccw_device_set_timeout(cdev, 0); | |
1374 | cdev->private->flags.fake_irb = 0; | |
1375 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1376 | if (cdev->online) | |
1377 | ccw_device_schedule_recovery(); | |
1378 | } | |
1379 | ||
91c36919 PO |
1380 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1381 | { | |
1382 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1383 | ||
1384 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1385 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1386 | ccw_device_set_timeout(cdev, 0); |
1387 | cio_disable_subchannel(sch); | |
1388 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1389 | } | |
1390 | ||
5d6e6b6f PO |
1391 | enum io_sch_action { |
1392 | IO_SCH_UNREG, | |
1393 | IO_SCH_ORPH_UNREG, | |
1394 | IO_SCH_ATTACH, | |
1395 | IO_SCH_UNREG_ATTACH, | |
1396 | IO_SCH_ORPH_ATTACH, | |
1397 | IO_SCH_REPROBE, | |
1398 | IO_SCH_VERIFY, | |
1399 | IO_SCH_DISC, | |
1400 | IO_SCH_NOP, | |
1401 | }; | |
1402 | ||
1403 | static enum io_sch_action sch_get_action(struct subchannel *sch) | |
1404 | { | |
1405 | struct ccw_device *cdev; | |
1406 | ||
1407 | cdev = sch_get_cdev(sch); | |
1408 | if (cio_update_schib(sch)) { | |
1409 | /* Not operational. */ | |
1410 | if (!cdev) | |
1411 | return IO_SCH_UNREG; | |
76e6fb4b | 1412 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1413 | return IO_SCH_UNREG; |
1414 | return IO_SCH_ORPH_UNREG; | |
1415 | } | |
1416 | /* Operational. */ | |
1417 | if (!cdev) | |
1418 | return IO_SCH_ATTACH; | |
1419 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
76e6fb4b | 1420 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1421 | return IO_SCH_UNREG_ATTACH; |
1422 | return IO_SCH_ORPH_ATTACH; | |
1423 | } | |
1424 | if ((sch->schib.pmcw.pam & sch->opm) == 0) { | |
76e6fb4b | 1425 | if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) |
5d6e6b6f PO |
1426 | return IO_SCH_UNREG; |
1427 | return IO_SCH_DISC; | |
1428 | } | |
1429 | if (device_is_disconnected(cdev)) | |
1430 | return IO_SCH_REPROBE; | |
31370f75 | 1431 | if (cdev->online && !cdev->private->flags.resuming) |
5d6e6b6f | 1432 | return IO_SCH_VERIFY; |
43d0be75 SO |
1433 | if (cdev->private->state == DEV_STATE_NOT_OPER) |
1434 | return IO_SCH_UNREG_ATTACH; | |
5d6e6b6f PO |
1435 | return IO_SCH_NOP; |
1436 | } | |
1437 | ||
1438 | /** | |
1439 | * io_subchannel_sch_event - process subchannel event | |
1440 | * @sch: subchannel | |
1441 | * @process: non-zero if function is called in process context | |
1442 | * | |
1443 | * An unspecified event occurred for this subchannel. Adjust data according | |
1444 | * to the current operational state of the subchannel and device. Return | |
1445 | * zero when the event has been handled sufficiently or -EAGAIN when this | |
1446 | * function should be called again in process context. | |
1447 | */ | |
1448 | static int io_subchannel_sch_event(struct subchannel *sch, int process) | |
c820de39 | 1449 | { |
c820de39 | 1450 | unsigned long flags; |
c820de39 | 1451 | struct ccw_device *cdev; |
5d6e6b6f PO |
1452 | struct ccw_dev_id dev_id; |
1453 | enum io_sch_action action; | |
1454 | int rc = -EAGAIN; | |
c820de39 CH |
1455 | |
1456 | spin_lock_irqsave(sch->lock, flags); | |
5d6e6b6f PO |
1457 | if (!device_is_registered(&sch->dev)) |
1458 | goto out_unlock; | |
390935ac PO |
1459 | if (work_pending(&sch->todo_work)) |
1460 | goto out_unlock; | |
37de53bb PO |
1461 | cdev = sch_get_cdev(sch); |
1462 | if (cdev && work_pending(&cdev->private->todo_work)) | |
1463 | goto out_unlock; | |
5d6e6b6f PO |
1464 | action = sch_get_action(sch); |
1465 | CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", | |
1466 | sch->schid.ssid, sch->schid.sch_no, process, | |
1467 | action); | |
1468 | /* Perform immediate actions while holding the lock. */ | |
5d6e6b6f PO |
1469 | switch (action) { |
1470 | case IO_SCH_REPROBE: | |
1471 | /* Trigger device recognition. */ | |
1472 | ccw_device_trigger_reprobe(cdev); | |
1473 | rc = 0; | |
1474 | goto out_unlock; | |
1475 | case IO_SCH_VERIFY: | |
1476 | /* Trigger path verification. */ | |
1477 | io_subchannel_verify(sch); | |
1478 | rc = 0; | |
1479 | goto out_unlock; | |
1480 | case IO_SCH_DISC: | |
1481 | ccw_device_set_disconnected(cdev); | |
1482 | rc = 0; | |
1483 | goto out_unlock; | |
1484 | case IO_SCH_ORPH_UNREG: | |
1485 | case IO_SCH_ORPH_ATTACH: | |
1486 | ccw_device_set_disconnected(cdev); | |
1487 | break; | |
1488 | case IO_SCH_UNREG_ATTACH: | |
1489 | case IO_SCH_UNREG: | |
16d2ce27 SO |
1490 | if (!cdev) |
1491 | break; | |
1492 | if (cdev->private->state == DEV_STATE_SENSE_ID) { | |
1493 | /* | |
1494 | * Note: delayed work triggered by this event | |
1495 | * and repeated calls to sch_event are synchronized | |
1496 | * by the above check for work_pending(cdev). | |
1497 | */ | |
1498 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
1499 | } else | |
5d6e6b6f PO |
1500 | ccw_device_set_notoper(cdev); |
1501 | break; | |
1502 | case IO_SCH_NOP: | |
1503 | rc = 0; | |
1504 | goto out_unlock; | |
1505 | default: | |
1506 | break; | |
c820de39 | 1507 | } |
5d6e6b6f PO |
1508 | spin_unlock_irqrestore(sch->lock, flags); |
1509 | /* All other actions require process context. */ | |
1510 | if (!process) | |
1511 | goto out; | |
1512 | /* Handle attached ccw device. */ | |
1513 | switch (action) { | |
1514 | case IO_SCH_ORPH_UNREG: | |
1515 | case IO_SCH_ORPH_ATTACH: | |
1516 | /* Move ccw device to orphanage. */ | |
1517 | rc = ccw_device_move_to_orph(cdev); | |
1518 | if (rc) | |
1519 | goto out; | |
c820de39 | 1520 | break; |
5d6e6b6f | 1521 | case IO_SCH_UNREG_ATTACH: |
3368ba25 | 1522 | spin_lock_irqsave(sch->lock, flags); |
74b6127e SO |
1523 | if (cdev->private->flags.resuming) { |
1524 | /* Device will be handled later. */ | |
1525 | rc = 0; | |
3368ba25 | 1526 | goto out_unlock; |
74b6127e | 1527 | } |
3368ba25 SO |
1528 | sch_set_cdev(sch, NULL); |
1529 | spin_unlock_irqrestore(sch->lock, flags); | |
5d6e6b6f | 1530 | /* Unregister ccw device. */ |
74b6127e | 1531 | ccw_device_unregister(cdev); |
c820de39 | 1532 | break; |
5d6e6b6f | 1533 | default: |
c820de39 CH |
1534 | break; |
1535 | } | |
5d6e6b6f | 1536 | /* Handle subchannel. */ |
c820de39 | 1537 | switch (action) { |
5d6e6b6f PO |
1538 | case IO_SCH_ORPH_UNREG: |
1539 | case IO_SCH_UNREG: | |
0d01bb89 SO |
1540 | if (!cdev || !cdev->private->flags.resuming) |
1541 | css_sch_device_unregister(sch); | |
c820de39 | 1542 | break; |
5d6e6b6f PO |
1543 | case IO_SCH_ORPH_ATTACH: |
1544 | case IO_SCH_UNREG_ATTACH: | |
1545 | case IO_SCH_ATTACH: | |
1546 | dev_id.ssid = sch->schid.ssid; | |
1547 | dev_id.devno = sch->schib.pmcw.dev; | |
1548 | cdev = get_ccwdev_by_dev_id(&dev_id); | |
1549 | if (!cdev) { | |
1550 | sch_create_and_recog_new_device(sch); | |
1551 | break; | |
1552 | } | |
1553 | rc = ccw_device_move_to_sch(cdev, sch); | |
1554 | if (rc) { | |
1555 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1556 | put_device(&cdev->dev); | |
1557 | goto out; | |
1558 | } | |
1559 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 | 1560 | ccw_device_trigger_reprobe(cdev); |
5d6e6b6f PO |
1561 | spin_unlock_irqrestore(sch->lock, flags); |
1562 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1563 | put_device(&cdev->dev); | |
91c36919 | 1564 | break; |
c820de39 CH |
1565 | default: |
1566 | break; | |
1567 | } | |
5d6e6b6f | 1568 | return 0; |
c820de39 | 1569 | |
5d6e6b6f PO |
1570 | out_unlock: |
1571 | spin_unlock_irqrestore(sch->lock, flags); | |
1572 | out: | |
1573 | return rc; | |
c820de39 CH |
1574 | } |
1575 | ||
137a14f4 SO |
1576 | static void ccw_device_set_int_class(struct ccw_device *cdev) |
1577 | { | |
1578 | struct ccw_driver *cdrv = cdev->drv; | |
1579 | ||
1580 | /* Note: we interpret class 0 in this context as an uninitialized | |
1581 | * field since it translates to a non-I/O interrupt class. */ | |
1582 | if (cdrv->int_class != 0) | |
1583 | cdev->private->int_class = cdrv->int_class; | |
1584 | else | |
1585 | cdev->private->int_class = IRQIO_CIO; | |
1586 | } | |
1587 | ||
1da177e4 | 1588 | #ifdef CONFIG_CCW_CONSOLE |
1e532096 | 1589 | int __init ccw_device_enable_console(struct ccw_device *cdev) |
1da177e4 | 1590 | { |
1e532096 | 1591 | struct subchannel *sch = to_subchannel(cdev->dev.parent); |
1da177e4 LT |
1592 | int rc; |
1593 | ||
1e532096 SO |
1594 | if (!cdev->drv || !cdev->handler) |
1595 | return -EINVAL; | |
1596 | ||
0ae7a7b2 | 1597 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1598 | rc = cio_commit_config(sch); |
1599 | if (rc) | |
1600 | return rc; | |
0ae7a7b2 | 1601 | sch->driver = &io_subchannel_driver; |
736b5db8 | 1602 | io_subchannel_recog(cdev, sch); |
1da177e4 LT |
1603 | /* Now wait for the async. recognition to come to an end. */ |
1604 | spin_lock_irq(cdev->ccwlock); | |
1605 | while (!dev_fsm_final_state(cdev)) | |
188561a4 SO |
1606 | ccw_device_wait_idle(cdev); |
1607 | ||
afdfed0f SO |
1608 | /* Hold on to an extra reference while device is online. */ |
1609 | get_device(&cdev->dev); | |
1610 | rc = ccw_device_online(cdev); | |
1611 | if (rc) | |
1da177e4 | 1612 | goto out_unlock; |
afdfed0f | 1613 | |
1da177e4 | 1614 | while (!dev_fsm_final_state(cdev)) |
188561a4 SO |
1615 | ccw_device_wait_idle(cdev); |
1616 | ||
afdfed0f SO |
1617 | if (cdev->private->state == DEV_STATE_ONLINE) |
1618 | cdev->online = 1; | |
1619 | else | |
1620 | rc = -EIO; | |
1da177e4 LT |
1621 | out_unlock: |
1622 | spin_unlock_irq(cdev->ccwlock); | |
afdfed0f SO |
1623 | if (rc) /* Give up online reference since onlining failed. */ |
1624 | put_device(&cdev->dev); | |
736b5db8 | 1625 | return rc; |
1da177e4 LT |
1626 | } |
1627 | ||
1e532096 | 1628 | struct ccw_device * __init ccw_device_create_console(struct ccw_driver *drv) |
1da177e4 | 1629 | { |
863fc849 | 1630 | struct io_subchannel_private *io_priv; |
afdfed0f | 1631 | struct ccw_device *cdev; |
1da177e4 | 1632 | struct subchannel *sch; |
1da177e4 | 1633 | |
1da177e4 | 1634 | sch = cio_probe_console(); |
afdfed0f SO |
1635 | if (IS_ERR(sch)) |
1636 | return ERR_CAST(sch); | |
863fc849 SO |
1637 | |
1638 | io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); | |
1639 | if (!io_priv) { | |
1640 | put_device(&sch->dev); | |
1641 | return ERR_PTR(-ENOMEM); | |
1642 | } | |
2c3e7e15 | 1643 | set_io_private(sch, io_priv); |
afdfed0f SO |
1644 | cdev = io_subchannel_create_ccwdev(sch); |
1645 | if (IS_ERR(cdev)) { | |
1646 | put_device(&sch->dev); | |
1647 | kfree(io_priv); | |
1648 | return cdev; | |
1649 | } | |
2253e8d7 | 1650 | cdev->drv = drv; |
137a14f4 | 1651 | ccw_device_set_int_class(cdev); |
afdfed0f | 1652 | return cdev; |
1da177e4 | 1653 | } |
1f4e7eda | 1654 | |
1e532096 SO |
1655 | void __init ccw_device_destroy_console(struct ccw_device *cdev) |
1656 | { | |
1657 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1658 | struct io_subchannel_private *io_priv = to_io_private(sch); | |
1659 | ||
1660 | set_io_private(sch, NULL); | |
1661 | put_device(&sch->dev); | |
1662 | put_device(&cdev->dev); | |
1663 | kfree(io_priv); | |
1664 | } | |
1665 | ||
188561a4 SO |
1666 | /** |
1667 | * ccw_device_wait_idle() - busy wait for device to become idle | |
1668 | * @cdev: ccw device | |
1669 | * | |
1670 | * Poll until activity control is zero, that is, no function or data | |
1671 | * transfer is pending/active. | |
1672 | * Called with device lock being held. | |
1673 | */ | |
1674 | void ccw_device_wait_idle(struct ccw_device *cdev) | |
1675 | { | |
1676 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1677 | ||
1678 | while (1) { | |
1679 | cio_tsch(sch); | |
1680 | if (sch->schib.scsw.cmd.actl == 0) | |
1681 | break; | |
1682 | udelay_simple(100); | |
1683 | } | |
1684 | } | |
1685 | ||
6664845c MS |
1686 | static int ccw_device_pm_restore(struct device *dev); |
1687 | ||
f10ccca7 | 1688 | int ccw_device_force_console(struct ccw_device *cdev) |
6664845c | 1689 | { |
f10ccca7 | 1690 | return ccw_device_pm_restore(&cdev->dev); |
6664845c MS |
1691 | } |
1692 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1693 | #endif |
1694 | ||
1695 | /* | |
1696 | * get ccw_device matching the busid, but only if owned by cdrv | |
1697 | */ | |
b0744bd2 CH |
1698 | static int |
1699 | __ccwdev_check_busid(struct device *dev, void *id) | |
1700 | { | |
1701 | char *bus_id; | |
1702 | ||
12975aef | 1703 | bus_id = id; |
b0744bd2 | 1704 | |
98df67b3 | 1705 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1706 | } |
1707 | ||
1708 | ||
b2ffd8e9 CH |
1709 | /** |
1710 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1711 | * @cdrv: driver the device is owned by | |
1712 | * @bus_id: bus id of the device to be searched | |
1713 | * | |
1714 | * This function searches all devices owned by @cdrv for a device with a bus | |
1715 | * id matching @bus_id. | |
1716 | * Returns: | |
1717 | * If a match is found, its reference count of the found device is increased | |
1718 | * and it is returned; else %NULL is returned. | |
1719 | */ | |
1720 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1721 | const char *bus_id) | |
1da177e4 | 1722 | { |
b0744bd2 | 1723 | struct device *dev; |
1da177e4 | 1724 | |
9f30ea95 | 1725 | dev = driver_find_device(&cdrv->driver, NULL, (void *)bus_id, |
b0744bd2 | 1726 | __ccwdev_check_busid); |
1da177e4 | 1727 | |
d2c993d8 | 1728 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1729 | } |
1730 | ||
1731 | /************************** device driver handling ************************/ | |
1732 | ||
1733 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1734 | * and release methods are initially very similar to the device_driver | |
1735 | * implementations, with the difference that they have ccw_device | |
1736 | * arguments. | |
1737 | * | |
1738 | * A ccw driver also contains the information that is needed for | |
1739 | * device matching. | |
1740 | */ | |
1741 | static int | |
1742 | ccw_device_probe (struct device *dev) | |
1743 | { | |
1744 | struct ccw_device *cdev = to_ccwdev(dev); | |
1745 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1746 | int ret; | |
1747 | ||
1748 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
137a14f4 | 1749 | ccw_device_set_int_class(cdev); |
1da177e4 | 1750 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; |
1da177e4 | 1751 | if (ret) { |
d2c993d8 | 1752 | cdev->drv = NULL; |
420f42ec | 1753 | cdev->private->int_class = IRQIO_CIO; |
1da177e4 LT |
1754 | return ret; |
1755 | } | |
1756 | ||
1757 | return 0; | |
1758 | } | |
1759 | ||
74bd0d85 | 1760 | static int ccw_device_remove(struct device *dev) |
1da177e4 LT |
1761 | { |
1762 | struct ccw_device *cdev = to_ccwdev(dev); | |
1763 | struct ccw_driver *cdrv = cdev->drv; | |
1764 | int ret; | |
1765 | ||
1da177e4 LT |
1766 | if (cdrv->remove) |
1767 | cdrv->remove(cdev); | |
74bd0d85 SO |
1768 | |
1769 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 LT |
1770 | if (cdev->online) { |
1771 | cdev->online = 0; | |
1da177e4 LT |
1772 | ret = ccw_device_offline(cdev); |
1773 | spin_unlock_irq(cdev->ccwlock); | |
1774 | if (ret == 0) | |
1775 | wait_event(cdev->private->wait_q, | |
1776 | dev_fsm_final_state(cdev)); | |
1777 | else | |
139b83dd | 1778 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1779 | "device 0.%x.%04x\n", |
1780 | ret, cdev->private->dev_id.ssid, | |
1781 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1782 | /* Give up reference obtained in ccw_device_set_online(). */ |
1783 | put_device(&cdev->dev); | |
74bd0d85 | 1784 | spin_lock_irq(cdev->ccwlock); |
1da177e4 LT |
1785 | } |
1786 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1787 | cdev->drv = NULL; |
420f42ec | 1788 | cdev->private->int_class = IRQIO_CIO; |
74bd0d85 | 1789 | spin_unlock_irq(cdev->ccwlock); |
a6ef1565 SO |
1790 | __disable_cmf(cdev); |
1791 | ||
1da177e4 LT |
1792 | return 0; |
1793 | } | |
1794 | ||
958974fb CH |
1795 | static void ccw_device_shutdown(struct device *dev) |
1796 | { | |
1797 | struct ccw_device *cdev; | |
1798 | ||
1799 | cdev = to_ccwdev(dev); | |
1800 | if (cdev->drv && cdev->drv->shutdown) | |
1801 | cdev->drv->shutdown(cdev); | |
1bc6664b | 1802 | __disable_cmf(cdev); |
958974fb CH |
1803 | } |
1804 | ||
823d494a SO |
1805 | static int ccw_device_pm_prepare(struct device *dev) |
1806 | { | |
1807 | struct ccw_device *cdev = to_ccwdev(dev); | |
1808 | ||
37de53bb | 1809 | if (work_pending(&cdev->private->todo_work)) |
823d494a SO |
1810 | return -EAGAIN; |
1811 | /* Fail while device is being set online/offline. */ | |
1812 | if (atomic_read(&cdev->private->onoff)) | |
1813 | return -EAGAIN; | |
1814 | ||
1815 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1816 | return cdev->drv->prepare(cdev); | |
1817 | ||
1818 | return 0; | |
1819 | } | |
1820 | ||
1821 | static void ccw_device_pm_complete(struct device *dev) | |
1822 | { | |
1823 | struct ccw_device *cdev = to_ccwdev(dev); | |
1824 | ||
1825 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1826 | cdev->drv->complete(cdev); | |
1827 | } | |
1828 | ||
1829 | static int ccw_device_pm_freeze(struct device *dev) | |
1830 | { | |
1831 | struct ccw_device *cdev = to_ccwdev(dev); | |
1832 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1833 | int ret, cm_enabled; | |
1834 | ||
1835 | /* Fail suspend while device is in transistional state. */ | |
1836 | if (!dev_fsm_final_state(cdev)) | |
1837 | return -EAGAIN; | |
1838 | if (!cdev->online) | |
1839 | return 0; | |
1840 | if (cdev->drv && cdev->drv->freeze) { | |
1841 | ret = cdev->drv->freeze(cdev); | |
1842 | if (ret) | |
1843 | return ret; | |
1844 | } | |
1845 | ||
1846 | spin_lock_irq(sch->lock); | |
1847 | cm_enabled = cdev->private->cmb != NULL; | |
1848 | spin_unlock_irq(sch->lock); | |
1849 | if (cm_enabled) { | |
1850 | /* Don't have the css write on memory. */ | |
1851 | ret = ccw_set_cmf(cdev, 0); | |
1852 | if (ret) | |
1853 | return ret; | |
1854 | } | |
1855 | /* From here on, disallow device driver I/O. */ | |
1856 | spin_lock_irq(sch->lock); | |
1857 | ret = cio_disable_subchannel(sch); | |
1858 | spin_unlock_irq(sch->lock); | |
1859 | ||
1860 | return ret; | |
1861 | } | |
1862 | ||
1863 | static int ccw_device_pm_thaw(struct device *dev) | |
1864 | { | |
1865 | struct ccw_device *cdev = to_ccwdev(dev); | |
1866 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1867 | int ret, cm_enabled; | |
1868 | ||
1869 | if (!cdev->online) | |
1870 | return 0; | |
1871 | ||
1872 | spin_lock_irq(sch->lock); | |
1873 | /* Allow device driver I/O again. */ | |
1874 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1875 | cm_enabled = cdev->private->cmb != NULL; | |
1876 | spin_unlock_irq(sch->lock); | |
1877 | if (ret) | |
1878 | return ret; | |
1879 | ||
1880 | if (cm_enabled) { | |
1881 | ret = ccw_set_cmf(cdev, 1); | |
1882 | if (ret) | |
1883 | return ret; | |
1884 | } | |
1885 | ||
1886 | if (cdev->drv && cdev->drv->thaw) | |
1887 | ret = cdev->drv->thaw(cdev); | |
1888 | ||
1889 | return ret; | |
1890 | } | |
1891 | ||
1892 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
1893 | { | |
1894 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
823d494a | 1895 | |
0d01bb89 SO |
1896 | spin_lock_irq(sch->lock); |
1897 | if (cio_is_console(sch->schid)) { | |
1898 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1899 | goto out_unlock; | |
1900 | } | |
823d494a SO |
1901 | /* |
1902 | * While we were sleeping, devices may have gone or become | |
1903 | * available again. Kick re-detection. | |
1904 | */ | |
823d494a | 1905 | cdev->private->flags.resuming = 1; |
b17295e6 | 1906 | cdev->private->path_new_mask = LPM_ANYPATH; |
817e5000 | 1907 | css_sched_sch_todo(sch, SCH_TODO_EVAL); |
0d01bb89 | 1908 | spin_unlock_irq(sch->lock); |
817e5000 | 1909 | css_wait_for_slow_path(); |
0d01bb89 SO |
1910 | |
1911 | /* cdev may have been moved to a different subchannel. */ | |
1912 | sch = to_subchannel(cdev->dev.parent); | |
1913 | spin_lock_irq(sch->lock); | |
1914 | if (cdev->private->state != DEV_STATE_ONLINE && | |
1915 | cdev->private->state != DEV_STATE_OFFLINE) | |
1916 | goto out_unlock; | |
1917 | ||
736b5db8 | 1918 | ccw_device_recognition(cdev); |
823d494a | 1919 | spin_unlock_irq(sch->lock); |
823d494a SO |
1920 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || |
1921 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
0d01bb89 SO |
1922 | spin_lock_irq(sch->lock); |
1923 | ||
1924 | out_unlock: | |
823d494a | 1925 | cdev->private->flags.resuming = 0; |
0d01bb89 | 1926 | spin_unlock_irq(sch->lock); |
823d494a SO |
1927 | } |
1928 | ||
1929 | static int resume_handle_boxed(struct ccw_device *cdev) | |
1930 | { | |
1931 | cdev->private->state = DEV_STATE_BOXED; | |
76e6fb4b | 1932 | if (ccw_device_notify(cdev, CIO_BOXED) == NOTIFY_OK) |
823d494a | 1933 | return 0; |
37de53bb | 1934 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1935 | return -ENODEV; |
1936 | } | |
1937 | ||
1938 | static int resume_handle_disc(struct ccw_device *cdev) | |
1939 | { | |
1940 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
76e6fb4b | 1941 | if (ccw_device_notify(cdev, CIO_GONE) == NOTIFY_OK) |
823d494a | 1942 | return 0; |
37de53bb | 1943 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1944 | return -ENODEV; |
1945 | } | |
1946 | ||
1947 | static int ccw_device_pm_restore(struct device *dev) | |
1948 | { | |
1949 | struct ccw_device *cdev = to_ccwdev(dev); | |
0d01bb89 SO |
1950 | struct subchannel *sch; |
1951 | int ret = 0; | |
823d494a SO |
1952 | |
1953 | __ccw_device_pm_restore(cdev); | |
0d01bb89 | 1954 | sch = to_subchannel(cdev->dev.parent); |
823d494a | 1955 | spin_lock_irq(sch->lock); |
0d01bb89 | 1956 | if (cio_is_console(sch->schid)) |
823d494a | 1957 | goto out_restore; |
0d01bb89 | 1958 | |
823d494a SO |
1959 | /* check recognition results */ |
1960 | switch (cdev->private->state) { | |
1961 | case DEV_STATE_OFFLINE: | |
0d01bb89 SO |
1962 | case DEV_STATE_ONLINE: |
1963 | cdev->private->flags.donotify = 0; | |
823d494a SO |
1964 | break; |
1965 | case DEV_STATE_BOXED: | |
1966 | ret = resume_handle_boxed(cdev); | |
823d494a | 1967 | if (ret) |
0d01bb89 | 1968 | goto out_unlock; |
823d494a | 1969 | goto out_restore; |
823d494a | 1970 | default: |
0d01bb89 SO |
1971 | ret = resume_handle_disc(cdev); |
1972 | if (ret) | |
1973 | goto out_unlock; | |
1974 | goto out_restore; | |
823d494a SO |
1975 | } |
1976 | /* check if the device type has changed */ | |
1977 | if (!ccw_device_test_sense_data(cdev)) { | |
1978 | ccw_device_update_sense_data(cdev); | |
37de53bb | 1979 | ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); |
823d494a SO |
1980 | ret = -ENODEV; |
1981 | goto out_unlock; | |
1982 | } | |
0d01bb89 | 1983 | if (!cdev->online) |
823d494a | 1984 | goto out_unlock; |
823d494a | 1985 | |
0d01bb89 SO |
1986 | if (ccw_device_online(cdev)) { |
1987 | ret = resume_handle_disc(cdev); | |
1988 | if (ret) | |
1989 | goto out_unlock; | |
1990 | goto out_restore; | |
1991 | } | |
823d494a | 1992 | spin_unlock_irq(sch->lock); |
823d494a | 1993 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
0d01bb89 SO |
1994 | spin_lock_irq(sch->lock); |
1995 | ||
1996 | if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) { | |
1997 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1998 | ret = -ENODEV; | |
1999 | goto out_unlock; | |
823d494a | 2000 | } |
0d01bb89 SO |
2001 | |
2002 | /* reenable cmf, if needed */ | |
2003 | if (cdev->private->cmb) { | |
2004 | spin_unlock_irq(sch->lock); | |
823d494a | 2005 | ret = ccw_set_cmf(cdev, 1); |
0d01bb89 | 2006 | spin_lock_irq(sch->lock); |
823d494a | 2007 | if (ret) { |
f014824e SO |
2008 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
2009 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
2010 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
2011 | ret = 0; |
2012 | } | |
2013 | } | |
2014 | ||
2015 | out_restore: | |
0d01bb89 | 2016 | spin_unlock_irq(sch->lock); |
823d494a SO |
2017 | if (cdev->online && cdev->drv && cdev->drv->restore) |
2018 | ret = cdev->drv->restore(cdev); | |
823d494a SO |
2019 | return ret; |
2020 | ||
823d494a SO |
2021 | out_unlock: |
2022 | spin_unlock_irq(sch->lock); | |
2023 | return ret; | |
2024 | } | |
2025 | ||
47145210 | 2026 | static const struct dev_pm_ops ccw_pm_ops = { |
823d494a SO |
2027 | .prepare = ccw_device_pm_prepare, |
2028 | .complete = ccw_device_pm_complete, | |
2029 | .freeze = ccw_device_pm_freeze, | |
2030 | .thaw = ccw_device_pm_thaw, | |
2031 | .restore = ccw_device_pm_restore, | |
2032 | }; | |
2033 | ||
d5ab5276 | 2034 | static struct bus_type ccw_bus_type = { |
8bbace7e CH |
2035 | .name = "ccw", |
2036 | .match = ccw_bus_match, | |
2037 | .uevent = ccw_uevent, | |
2038 | .probe = ccw_device_probe, | |
2039 | .remove = ccw_device_remove, | |
958974fb | 2040 | .shutdown = ccw_device_shutdown, |
823d494a | 2041 | .pm = &ccw_pm_ops, |
8bbace7e CH |
2042 | }; |
2043 | ||
b2ffd8e9 CH |
2044 | /** |
2045 | * ccw_driver_register() - register a ccw driver | |
2046 | * @cdriver: driver to be registered | |
2047 | * | |
2048 | * This function is mainly a wrapper around driver_register(). | |
2049 | * Returns: | |
2050 | * %0 on success and a negative error value on failure. | |
2051 | */ | |
2052 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
2053 | { |
2054 | struct device_driver *drv = &cdriver->driver; | |
2055 | ||
2056 | drv->bus = &ccw_bus_type; | |
1da177e4 LT |
2057 | |
2058 | return driver_register(drv); | |
2059 | } | |
2060 | ||
b2ffd8e9 CH |
2061 | /** |
2062 | * ccw_driver_unregister() - deregister a ccw driver | |
2063 | * @cdriver: driver to be deregistered | |
2064 | * | |
2065 | * This function is mainly a wrapper around driver_unregister(). | |
2066 | */ | |
2067 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
2068 | { |
2069 | driver_unregister(&cdriver->driver); | |
2070 | } | |
2071 | ||
37de53bb PO |
2072 | static void ccw_device_todo(struct work_struct *work) |
2073 | { | |
2074 | struct ccw_device_private *priv; | |
2075 | struct ccw_device *cdev; | |
2076 | struct subchannel *sch; | |
2077 | enum cdev_todo todo; | |
2078 | ||
2079 | priv = container_of(work, struct ccw_device_private, todo_work); | |
2080 | cdev = priv->cdev; | |
2081 | sch = to_subchannel(cdev->dev.parent); | |
2082 | /* Find out todo. */ | |
2083 | spin_lock_irq(cdev->ccwlock); | |
2084 | todo = priv->todo; | |
2085 | priv->todo = CDEV_TODO_NOTHING; | |
2086 | CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n", | |
2087 | priv->dev_id.ssid, priv->dev_id.devno, todo); | |
2088 | spin_unlock_irq(cdev->ccwlock); | |
2089 | /* Perform todo. */ | |
2090 | switch (todo) { | |
2091 | case CDEV_TODO_ENABLE_CMF: | |
2092 | cmf_reenable(cdev); | |
2093 | break; | |
2094 | case CDEV_TODO_REBIND: | |
2095 | ccw_device_do_unbind_bind(cdev); | |
2096 | break; | |
2097 | case CDEV_TODO_REGISTER: | |
2098 | io_subchannel_register(cdev); | |
2099 | break; | |
2100 | case CDEV_TODO_UNREG_EVAL: | |
2101 | if (!sch_is_pseudo_sch(sch)) | |
2102 | css_schedule_eval(sch->schid); | |
2103 | /* fall-through */ | |
2104 | case CDEV_TODO_UNREG: | |
2105 | if (sch_is_pseudo_sch(sch)) | |
2106 | ccw_device_unregister(cdev); | |
2107 | else | |
2108 | ccw_device_call_sch_unregister(cdev); | |
2109 | break; | |
2110 | default: | |
2111 | break; | |
2112 | } | |
2113 | /* Release workqueue ref. */ | |
2114 | put_device(&cdev->dev); | |
2115 | } | |
2116 | ||
2117 | /** | |
2118 | * ccw_device_sched_todo - schedule ccw device operation | |
2119 | * @cdev: ccw device | |
2120 | * @todo: todo | |
2121 | * | |
2122 | * Schedule the operation identified by @todo to be performed on the slow path | |
2123 | * workqueue. Do nothing if another operation with higher priority is already | |
2124 | * scheduled. Needs to be called with ccwdev lock held. | |
2125 | */ | |
2126 | void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo) | |
2127 | { | |
2128 | CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n", | |
2129 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
2130 | todo); | |
2131 | if (cdev->private->todo >= todo) | |
2132 | return; | |
2133 | cdev->private->todo = todo; | |
2134 | /* Get workqueue ref. */ | |
2135 | if (!get_device(&cdev->dev)) | |
2136 | return; | |
be5d3823 | 2137 | if (!queue_work(cio_work_q, &cdev->private->todo_work)) { |
37de53bb PO |
2138 | /* Already queued, release workqueue ref. */ |
2139 | put_device(&cdev->dev); | |
2140 | } | |
2141 | } | |
2142 | ||
fd0457a6 ME |
2143 | /** |
2144 | * ccw_device_siosl() - initiate logging | |
2145 | * @cdev: ccw device | |
2146 | * | |
2147 | * This function is used to invoke model-dependent logging within the channel | |
2148 | * subsystem. | |
2149 | */ | |
2150 | int ccw_device_siosl(struct ccw_device *cdev) | |
2151 | { | |
2152 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
2153 | ||
2154 | return chsc_siosl(sch->schid); | |
2155 | } | |
2156 | EXPORT_SYMBOL_GPL(ccw_device_siosl); | |
2157 | ||
1da177e4 LT |
2158 | MODULE_LICENSE("GPL"); |
2159 | EXPORT_SYMBOL(ccw_device_set_online); | |
2160 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2161 | EXPORT_SYMBOL(ccw_driver_register); | |
2162 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2163 | EXPORT_SYMBOL(get_ccwdev_by_busid); |