Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device.c | |
3 | * bus driver for ccw devices | |
1da177e4 | 4 | * |
c820de39 | 5 | * Copyright IBM Corp. 2002,2008 |
1da177e4 | 6 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) |
4ce3b30c | 7 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
8 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
9 | */ | |
a7ae2c02 PO |
10 | |
11 | #define KMSG_COMPONENT "cio" | |
12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
13 | ||
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/spinlock.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/workqueue.h> | |
90ab1336 | 23 | #include <linux/timer.h> |
1da177e4 LT |
24 | |
25 | #include <asm/ccwdev.h> | |
26 | #include <asm/cio.h> | |
4e57b681 | 27 | #include <asm/param.h> /* HZ */ |
1842f2b1 | 28 | #include <asm/cmb.h> |
3a3fc29a | 29 | #include <asm/isc.h> |
1da177e4 | 30 | |
0ae7a7b2 | 31 | #include "chp.h" |
1da177e4 | 32 | #include "cio.h" |
d7b5a4c9 | 33 | #include "cio_debug.h" |
1da177e4 LT |
34 | #include "css.h" |
35 | #include "device.h" | |
36 | #include "ioasm.h" | |
cd6b4f27 | 37 | #include "io_sch.h" |
ecf5d9ef | 38 | #include "blacklist.h" |
1da177e4 | 39 | |
90ab1336 | 40 | static struct timer_list recovery_timer; |
486d0a00 | 41 | static DEFINE_SPINLOCK(recovery_lock); |
90ab1336 PO |
42 | static int recovery_phase; |
43 | static const unsigned long recovery_delay[] = { 3, 30, 300 }; | |
44 | ||
1da177e4 LT |
45 | /******************* bus type handling ***********************/ |
46 | ||
47 | /* The Linux driver model distinguishes between a bus type and | |
48 | * the bus itself. Of course we only have one channel | |
49 | * subsystem driver and one channel system per machine, but | |
50 | * we still use the abstraction. T.R. says it's a good idea. */ | |
51 | static int | |
52 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
53 | { | |
54 | struct ccw_device *cdev = to_ccwdev(dev); | |
55 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
56 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
57 | ||
58 | if (!ids) | |
59 | return 0; | |
60 | ||
61 | found = ccw_device_id_match(ids, &cdev->id); | |
62 | if (!found) | |
63 | return 0; | |
64 | ||
65 | cdev->id.driver_info = found->driver_info; | |
66 | ||
67 | return 1; | |
68 | } | |
69 | ||
db0c2d59 PO |
70 | /* Store modalias string delimited by prefix/suffix string into buffer with |
71 | * specified size. Return length of resulting string (excluding trailing '\0') | |
72 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 73 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 74 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 75 | { |
db0c2d59 | 76 | int len; |
1da177e4 | 77 | |
cfbe9bb2 | 78 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
79 | if (len > size) |
80 | return len; | |
81 | buf += len; | |
82 | size -= len; | |
1da177e4 | 83 | |
db0c2d59 PO |
84 | if (id->dev_type != 0) |
85 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
86 | id->dev_model, suffix); | |
87 | else | |
88 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 89 | |
db0c2d59 PO |
90 | return len; |
91 | } | |
92 | ||
93 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
94 | * non-zero otherwise. */ | |
7eff2e7a | 95 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
96 | { |
97 | struct ccw_device *cdev = to_ccwdev(dev); | |
98 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
99 | int ret; |
100 | char modalias_buf[30]; | |
1da177e4 | 101 | |
db0c2d59 | 102 | /* CU_TYPE= */ |
7eff2e7a | 103 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
104 | if (ret) |
105 | return ret; | |
db0c2d59 PO |
106 | |
107 | /* CU_MODEL= */ | |
7eff2e7a | 108 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
109 | if (ret) |
110 | return ret; | |
1da177e4 LT |
111 | |
112 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 113 | /* DEV_TYPE= */ |
7eff2e7a | 114 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
115 | if (ret) |
116 | return ret; | |
1da177e4 | 117 | |
db0c2d59 | 118 | /* DEV_MODEL= */ |
7eff2e7a | 119 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
120 | if (ret) |
121 | return ret; | |
db0c2d59 PO |
122 | |
123 | /* MODALIAS= */ | |
cfbe9bb2 | 124 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
125 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
126 | return ret; | |
1da177e4 LT |
127 | } |
128 | ||
8bbace7e | 129 | struct bus_type ccw_bus_type; |
1da177e4 | 130 | |
602b20f2 CH |
131 | static void io_subchannel_irq(struct subchannel *); |
132 | static int io_subchannel_probe(struct subchannel *); | |
133 | static int io_subchannel_remove(struct subchannel *); | |
8bbace7e | 134 | static void io_subchannel_shutdown(struct subchannel *); |
c820de39 | 135 | static int io_subchannel_sch_event(struct subchannel *, int); |
99611f87 CH |
136 | static int io_subchannel_chp_event(struct subchannel *, struct chp_link *, |
137 | int); | |
8ea7f559 | 138 | static void recovery_func(unsigned long data); |
8ea7f559 SO |
139 | wait_queue_head_t ccw_device_init_wq; |
140 | atomic_t ccw_device_init_count; | |
1da177e4 | 141 | |
f08adc00 CH |
142 | static struct css_device_id io_subchannel_ids[] = { |
143 | { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, | |
144 | { /* end of list */ }, | |
145 | }; | |
146 | MODULE_DEVICE_TABLE(css, io_subchannel_ids); | |
147 | ||
93a27592 CH |
148 | static int io_subchannel_prepare(struct subchannel *sch) |
149 | { | |
150 | struct ccw_device *cdev; | |
151 | /* | |
152 | * Don't allow suspend while a ccw device registration | |
153 | * is still outstanding. | |
154 | */ | |
155 | cdev = sch_get_cdev(sch); | |
156 | if (cdev && !device_is_registered(&cdev->dev)) | |
157 | return -EAGAIN; | |
158 | return 0; | |
159 | } | |
160 | ||
b4c70721 | 161 | static int io_subchannel_settle(void) |
8ea7f559 | 162 | { |
b4c70721 SO |
163 | int ret; |
164 | ||
165 | ret = wait_event_interruptible(ccw_device_init_wq, | |
166 | atomic_read(&ccw_device_init_count) == 0); | |
167 | if (ret) | |
168 | return -EINTR; | |
be5d3823 | 169 | flush_workqueue(cio_work_q); |
b4c70721 | 170 | return 0; |
8ea7f559 SO |
171 | } |
172 | ||
f7e5d67c | 173 | static struct css_driver io_subchannel_driver = { |
4beee646 | 174 | .owner = THIS_MODULE, |
f08adc00 | 175 | .subchannel_type = io_subchannel_ids, |
25b7bb58 | 176 | .name = "io_subchannel", |
1da177e4 | 177 | .irq = io_subchannel_irq, |
c820de39 CH |
178 | .sch_event = io_subchannel_sch_event, |
179 | .chp_event = io_subchannel_chp_event, | |
8bbace7e CH |
180 | .probe = io_subchannel_probe, |
181 | .remove = io_subchannel_remove, | |
182 | .shutdown = io_subchannel_shutdown, | |
93a27592 | 183 | .prepare = io_subchannel_prepare, |
8ea7f559 | 184 | .settle = io_subchannel_settle, |
1da177e4 LT |
185 | }; |
186 | ||
2f17644d | 187 | int __init io_subchannel_init(void) |
1da177e4 LT |
188 | { |
189 | int ret; | |
190 | ||
191 | init_waitqueue_head(&ccw_device_init_wq); | |
192 | atomic_set(&ccw_device_init_count, 0); | |
90ab1336 | 193 | setup_timer(&recovery_timer, recovery_func, 0); |
1da177e4 | 194 | |
be5d3823 SO |
195 | ret = bus_register(&ccw_bus_type); |
196 | if (ret) | |
197 | return ret; | |
25b7bb58 CH |
198 | ret = css_driver_register(&io_subchannel_driver); |
199 | if (ret) | |
be5d3823 | 200 | bus_unregister(&ccw_bus_type); |
1da177e4 | 201 | |
1da177e4 LT |
202 | return ret; |
203 | } | |
204 | ||
1da177e4 LT |
205 | |
206 | /************************ device handling **************************/ | |
207 | ||
208 | /* | |
209 | * A ccw_device has some interfaces in sysfs in addition to the | |
210 | * standard ones. | |
211 | * The following entries are designed to export the information which | |
212 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
213 | * are obvious, so they don't have an entry :) | |
214 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
215 | */ | |
216 | static ssize_t | |
3fd3c0a5 | 217 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
218 | { |
219 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 220 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
221 | ssize_t ret = 0; |
222 | int chp; | |
7ad6a249 PO |
223 | int mask; |
224 | ||
225 | for (chp = 0; chp < 8; chp++) { | |
226 | mask = 0x80 >> chp; | |
227 | if (ssd->path_mask & mask) | |
228 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
229 | else | |
230 | ret += sprintf(buf + ret, "00 "); | |
231 | } | |
1da177e4 LT |
232 | ret += sprintf (buf+ret, "\n"); |
233 | return min((ssize_t)PAGE_SIZE, ret); | |
234 | } | |
235 | ||
236 | static ssize_t | |
3fd3c0a5 | 237 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
238 | { |
239 | struct subchannel *sch = to_subchannel(dev); | |
240 | struct pmcw *pmcw = &sch->schib.pmcw; | |
241 | ||
242 | return sprintf (buf, "%02x %02x %02x\n", | |
243 | pmcw->pim, pmcw->pam, pmcw->pom); | |
244 | } | |
245 | ||
246 | static ssize_t | |
3fd3c0a5 | 247 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
248 | { |
249 | struct ccw_device *cdev = to_ccwdev(dev); | |
250 | struct ccw_device_id *id = &(cdev->id); | |
251 | ||
252 | if (id->dev_type != 0) | |
253 | return sprintf(buf, "%04x/%02x\n", | |
254 | id->dev_type, id->dev_model); | |
255 | else | |
256 | return sprintf(buf, "n/a\n"); | |
257 | } | |
258 | ||
259 | static ssize_t | |
3fd3c0a5 | 260 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
261 | { |
262 | struct ccw_device *cdev = to_ccwdev(dev); | |
263 | struct ccw_device_id *id = &(cdev->id); | |
264 | ||
265 | return sprintf(buf, "%04x/%02x\n", | |
266 | id->cu_type, id->cu_model); | |
267 | } | |
268 | ||
f1fc78a8 BB |
269 | static ssize_t |
270 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
271 | { | |
272 | struct ccw_device *cdev = to_ccwdev(dev); | |
273 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 274 | int len; |
f1fc78a8 | 275 | |
086a6c62 | 276 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
277 | |
278 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
279 | } |
280 | ||
1da177e4 | 281 | static ssize_t |
3fd3c0a5 | 282 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
283 | { |
284 | struct ccw_device *cdev = to_ccwdev(dev); | |
285 | ||
286 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
287 | } | |
288 | ||
d7b5a4c9 CH |
289 | int ccw_device_is_orphan(struct ccw_device *cdev) |
290 | { | |
291 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
292 | } | |
293 | ||
ef99516c | 294 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 295 | { |
7d253b9a | 296 | if (device_is_registered(&cdev->dev)) { |
24a1872d | 297 | /* Undo device_add(). */ |
ef99516c | 298 | device_del(&cdev->dev); |
24a1872d SO |
299 | } |
300 | if (cdev->private->flags.initialized) { | |
301 | cdev->private->flags.initialized = 0; | |
3b554a14 SO |
302 | /* Release reference from device_initialize(). */ |
303 | put_device(&cdev->dev); | |
304 | } | |
7674da77 CH |
305 | } |
306 | ||
d40f7b75 SO |
307 | static void io_subchannel_quiesce(struct subchannel *); |
308 | ||
b2ffd8e9 CH |
309 | /** |
310 | * ccw_device_set_offline() - disable a ccw device for I/O | |
311 | * @cdev: target ccw device | |
312 | * | |
313 | * This function calls the driver's set_offline() function for @cdev, if | |
314 | * given, and then disables @cdev. | |
315 | * Returns: | |
316 | * %0 on success and a negative error value on failure. | |
317 | * Context: | |
318 | * enabled, ccw device lock not held | |
319 | */ | |
320 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 | 321 | { |
d40f7b75 SO |
322 | struct subchannel *sch; |
323 | int ret, state; | |
1da177e4 LT |
324 | |
325 | if (!cdev) | |
326 | return -ENODEV; | |
327 | if (!cdev->online || !cdev->drv) | |
328 | return -EINVAL; | |
329 | ||
330 | if (cdev->drv->set_offline) { | |
331 | ret = cdev->drv->set_offline(cdev); | |
332 | if (ret != 0) | |
333 | return ret; | |
334 | } | |
335 | cdev->online = 0; | |
336 | spin_lock_irq(cdev->ccwlock); | |
d40f7b75 | 337 | sch = to_subchannel(cdev->dev.parent); |
217ee6c6 ME |
338 | /* Wait until a final state or DISCONNECTED is reached */ |
339 | while (!dev_fsm_final_state(cdev) && | |
340 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
1da177e4 | 341 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
342 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
343 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
344 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 | 345 | } |
d40f7b75 SO |
346 | do { |
347 | ret = ccw_device_offline(cdev); | |
348 | if (!ret) | |
349 | break; | |
350 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device " | |
351 | "0.%x.%04x\n", ret, cdev->private->dev_id.ssid, | |
352 | cdev->private->dev_id.devno); | |
353 | if (ret != -EBUSY) | |
354 | goto error; | |
355 | state = cdev->private->state; | |
356 | spin_unlock_irq(cdev->ccwlock); | |
357 | io_subchannel_quiesce(sch); | |
358 | spin_lock_irq(cdev->ccwlock); | |
359 | cdev->private->state = state; | |
360 | } while (ret == -EBUSY); | |
1da177e4 | 361 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
362 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
363 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
a7ae2c02 PO |
364 | /* Inform the user if set offline failed. */ |
365 | if (cdev->private->state == DEV_STATE_BOXED) { | |
366 | pr_warning("%s: The device entered boxed state while " | |
367 | "being set offline\n", dev_name(&cdev->dev)); | |
368 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
369 | pr_warning("%s: The device stopped operating while " | |
370 | "being set offline\n", dev_name(&cdev->dev)); | |
371 | } | |
217ee6c6 ME |
372 | /* Give up reference from ccw_device_set_online(). */ |
373 | put_device(&cdev->dev); | |
374 | return 0; | |
375 | ||
376 | error: | |
217ee6c6 ME |
377 | cdev->private->state = DEV_STATE_OFFLINE; |
378 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
379 | spin_unlock_irq(cdev->ccwlock); | |
380 | /* Give up reference from ccw_device_set_online(). */ | |
381 | put_device(&cdev->dev); | |
382 | return -ENODEV; | |
1da177e4 LT |
383 | } |
384 | ||
b2ffd8e9 CH |
385 | /** |
386 | * ccw_device_set_online() - enable a ccw device for I/O | |
387 | * @cdev: target ccw device | |
388 | * | |
389 | * This function first enables @cdev and then calls the driver's set_online() | |
390 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
391 | * disabled again. | |
392 | * Returns: | |
393 | * %0 on success and a negative error value on failure. | |
394 | * Context: | |
395 | * enabled, ccw device lock not held | |
396 | */ | |
397 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
398 | { |
399 | int ret; | |
217ee6c6 | 400 | int ret2; |
1da177e4 LT |
401 | |
402 | if (!cdev) | |
403 | return -ENODEV; | |
404 | if (cdev->online || !cdev->drv) | |
405 | return -EINVAL; | |
9cd67421 CH |
406 | /* Hold on to an extra reference while device is online. */ |
407 | if (!get_device(&cdev->dev)) | |
408 | return -ENODEV; | |
1da177e4 LT |
409 | |
410 | spin_lock_irq(cdev->ccwlock); | |
411 | ret = ccw_device_online(cdev); | |
412 | spin_unlock_irq(cdev->ccwlock); | |
413 | if (ret == 0) | |
414 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
415 | else { | |
139b83dd | 416 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
417 | "device 0.%x.%04x\n", |
418 | ret, cdev->private->dev_id.ssid, | |
419 | cdev->private->dev_id.devno); | |
9cd67421 CH |
420 | /* Give up online reference since onlining failed. */ |
421 | put_device(&cdev->dev); | |
1da177e4 LT |
422 | return ret; |
423 | } | |
217ee6c6 ME |
424 | spin_lock_irq(cdev->ccwlock); |
425 | /* Check if online processing was successful */ | |
426 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
427 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
428 | spin_unlock_irq(cdev->ccwlock); | |
a7ae2c02 PO |
429 | /* Inform the user that set online failed. */ |
430 | if (cdev->private->state == DEV_STATE_BOXED) { | |
431 | pr_warning("%s: Setting the device online failed " | |
432 | "because it is boxed\n", | |
433 | dev_name(&cdev->dev)); | |
434 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
435 | pr_warning("%s: Setting the device online failed " | |
436 | "because it is not operational\n", | |
437 | dev_name(&cdev->dev)); | |
438 | } | |
9cd67421 CH |
439 | /* Give up online reference since onlining failed. */ |
440 | put_device(&cdev->dev); | |
1da177e4 | 441 | return -ENODEV; |
9cd67421 | 442 | } |
217ee6c6 ME |
443 | spin_unlock_irq(cdev->ccwlock); |
444 | if (cdev->drv->set_online) | |
445 | ret = cdev->drv->set_online(cdev); | |
446 | if (ret) | |
447 | goto rollback; | |
448 | cdev->online = 1; | |
449 | return 0; | |
450 | ||
451 | rollback: | |
1da177e4 | 452 | spin_lock_irq(cdev->ccwlock); |
217ee6c6 ME |
453 | /* Wait until a final state or DISCONNECTED is reached */ |
454 | while (!dev_fsm_final_state(cdev) && | |
455 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
456 | spin_unlock_irq(cdev->ccwlock); | |
457 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
458 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
459 | spin_lock_irq(cdev->ccwlock); | |
460 | } | |
461 | ret2 = ccw_device_offline(cdev); | |
462 | if (ret2) | |
463 | goto error; | |
464 | spin_unlock_irq(cdev->ccwlock); | |
465 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
466 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
467 | /* Give up online reference since onlining failed. */ | |
468 | put_device(&cdev->dev); | |
469 | return ret; | |
470 | ||
471 | error: | |
472 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
473 | "device 0.%x.%04x\n", | |
474 | ret2, cdev->private->dev_id.ssid, | |
475 | cdev->private->dev_id.devno); | |
476 | cdev->private->state = DEV_STATE_OFFLINE; | |
1da177e4 | 477 | spin_unlock_irq(cdev->ccwlock); |
9cd67421 CH |
478 | /* Give up online reference since onlining failed. */ |
479 | put_device(&cdev->dev); | |
217ee6c6 | 480 | return ret; |
1da177e4 LT |
481 | } |
482 | ||
e74fe0ce | 483 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 | 484 | { |
37de53bb PO |
485 | if (cdev->private->state == DEV_STATE_DISCONNECTED) { |
486 | spin_lock_irq(cdev->ccwlock); | |
487 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); | |
488 | spin_unlock_irq(cdev->ccwlock); | |
489 | } else if (cdev->online && cdev->drv && cdev->drv->set_offline) | |
e74fe0ce SO |
490 | return ccw_device_set_offline(cdev); |
491 | return 0; | |
f5ba6c86 CH |
492 | } |
493 | ||
494 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
495 | { | |
f5ba6c86 | 496 | /* Do device recognition, if needed. */ |
99f6a570 | 497 | if (cdev->private->state == DEV_STATE_BOXED) { |
1f5bd384 | 498 | spin_lock_irq(cdev->ccwlock); |
736b5db8 | 499 | ccw_device_recognition(cdev); |
1f5bd384 | 500 | spin_unlock_irq(cdev->ccwlock); |
f5ba6c86 CH |
501 | wait_event(cdev->private->wait_q, |
502 | cdev->private->flags.recog_done); | |
156013ff SO |
503 | if (cdev->private->state != DEV_STATE_OFFLINE) |
504 | /* recognition failed */ | |
505 | return -EAGAIN; | |
f5ba6c86 CH |
506 | } |
507 | if (cdev->drv && cdev->drv->set_online) | |
508 | ccw_device_set_online(cdev); | |
509 | return 0; | |
510 | } | |
156013ff | 511 | |
c78aa6cb | 512 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
513 | { |
514 | int ret; | |
515 | ||
516 | ret = online_store_recog_and_online(cdev); | |
156013ff | 517 | if (ret && !force) |
c78aa6cb | 518 | return ret; |
f5ba6c86 CH |
519 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
520 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
521 | if (ret) |
522 | return ret; | |
f5ba6c86 CH |
523 | if (cdev->id.cu_type == 0) |
524 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
525 | ret = online_store_recog_and_online(cdev); |
526 | if (ret) | |
527 | return ret; | |
f5ba6c86 | 528 | } |
c78aa6cb | 529 | return 0; |
f5ba6c86 CH |
530 | } |
531 | ||
532 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
533 | const char *buf, size_t count) | |
1da177e4 LT |
534 | { |
535 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
536 | int force, ret; |
537 | unsigned long i; | |
1da177e4 | 538 | |
350e9120 PO |
539 | if (!dev_fsm_final_state(cdev) && |
540 | cdev->private->state != DEV_STATE_DISCONNECTED) | |
541 | return -EAGAIN; | |
542 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) | |
1da177e4 LT |
543 | return -EAGAIN; |
544 | ||
545 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
546 | atomic_set(&cdev->private->onoff, 0); | |
547 | return -EINVAL; | |
548 | } | |
549 | if (!strncmp(buf, "force\n", count)) { | |
550 | force = 1; | |
551 | i = 1; | |
2f972202 | 552 | ret = 0; |
1da177e4 LT |
553 | } else { |
554 | force = 0; | |
2f972202 | 555 | ret = strict_strtoul(buf, 16, &i); |
1da177e4 | 556 | } |
2f972202 CH |
557 | if (ret) |
558 | goto out; | |
f5ba6c86 CH |
559 | switch (i) { |
560 | case 0: | |
e74fe0ce | 561 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
562 | break; |
563 | case 1: | |
c78aa6cb | 564 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
565 | break; |
566 | default: | |
2f972202 | 567 | ret = -EINVAL; |
1da177e4 | 568 | } |
2f972202 | 569 | out: |
1da177e4 LT |
570 | if (cdev->drv) |
571 | module_put(cdev->drv->owner); | |
572 | atomic_set(&cdev->private->onoff, 0); | |
e74fe0ce | 573 | return (ret < 0) ? ret : count; |
1da177e4 LT |
574 | } |
575 | ||
576 | static ssize_t | |
3fd3c0a5 | 577 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
578 | { |
579 | struct ccw_device *cdev = to_ccwdev(dev); | |
580 | struct subchannel *sch; | |
581 | ||
d7b5a4c9 CH |
582 | if (ccw_device_is_orphan(cdev)) |
583 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
584 | switch (cdev->private->state) { |
585 | case DEV_STATE_BOXED: | |
586 | return sprintf(buf, "boxed\n"); | |
587 | case DEV_STATE_DISCONNECTED: | |
588 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
589 | case DEV_STATE_NOT_OPER: | |
590 | sch = to_subchannel(dev->parent); | |
591 | if (!sch->lpm) | |
592 | return sprintf(buf, "no path\n"); | |
593 | else | |
594 | return sprintf(buf, "no device\n"); | |
595 | default: | |
596 | /* All other states considered fine. */ | |
597 | return sprintf(buf, "good\n"); | |
598 | } | |
599 | } | |
600 | ||
601 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
602 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
603 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
604 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 605 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 606 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 LT |
607 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
608 | ||
7e9db9ea | 609 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
610 | &dev_attr_chpids.attr, |
611 | &dev_attr_pimpampom.attr, | |
612 | NULL, | |
613 | }; | |
614 | ||
7e9db9ea CH |
615 | static struct attribute_group io_subchannel_attr_group = { |
616 | .attrs = io_subchannel_attrs, | |
529192f3 | 617 | }; |
1da177e4 LT |
618 | |
619 | static struct attribute * ccwdev_attrs[] = { | |
620 | &dev_attr_devtype.attr, | |
621 | &dev_attr_cutype.attr, | |
f1fc78a8 | 622 | &dev_attr_modalias.attr, |
1da177e4 LT |
623 | &dev_attr_online.attr, |
624 | &dev_attr_cmb_enable.attr, | |
625 | &dev_attr_availability.attr, | |
626 | NULL, | |
627 | }; | |
628 | ||
629 | static struct attribute_group ccwdev_attr_group = { | |
630 | .attrs = ccwdev_attrs, | |
631 | }; | |
632 | ||
a4dbd674 | 633 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
634 | &ccwdev_attr_group, |
635 | NULL, | |
636 | }; | |
1da177e4 LT |
637 | |
638 | /* this is a simple abstraction for device_register that sets the | |
639 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 640 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
641 | { |
642 | struct device *dev = &cdev->dev; | |
643 | int ret; | |
644 | ||
645 | dev->bus = &ccw_bus_type; | |
3ac276f8 SO |
646 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
647 | cdev->private->dev_id.devno); | |
648 | if (ret) | |
649 | return ret; | |
7d253b9a | 650 | return device_add(dev); |
1da177e4 LT |
651 | } |
652 | ||
5d6e6b6f | 653 | static int match_dev_id(struct device *dev, void *data) |
b0744bd2 | 654 | { |
5d6e6b6f PO |
655 | struct ccw_device *cdev = to_ccwdev(dev); |
656 | struct ccw_dev_id *dev_id = data; | |
d7b5a4c9 | 657 | |
d7b5a4c9 CH |
658 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); |
659 | } | |
660 | ||
5d6e6b6f | 661 | static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id) |
d7b5a4c9 CH |
662 | { |
663 | struct device *dev; | |
664 | ||
5d6e6b6f | 665 | dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id); |
d7b5a4c9 CH |
666 | |
667 | return dev ? to_ccwdev(dev) : NULL; | |
668 | } | |
669 | ||
37de53bb | 670 | static void ccw_device_do_unbind_bind(struct ccw_device *cdev) |
1da177e4 | 671 | { |
eb32ae8d | 672 | int ret; |
1da177e4 | 673 | |
7d253b9a | 674 | if (device_is_registered(&cdev->dev)) { |
eb32ae8d CH |
675 | device_release_driver(&cdev->dev); |
676 | ret = device_attach(&cdev->dev); | |
677 | WARN_ON(ret == -ENODEV); | |
678 | } | |
1da177e4 LT |
679 | } |
680 | ||
681 | static void | |
682 | ccw_device_release(struct device *dev) | |
683 | { | |
684 | struct ccw_device *cdev; | |
685 | ||
686 | cdev = to_ccwdev(dev); | |
6eff208f CH |
687 | /* Release reference of parent subchannel. */ |
688 | put_device(cdev->dev.parent); | |
1da177e4 LT |
689 | kfree(cdev->private); |
690 | kfree(cdev); | |
691 | } | |
692 | ||
7674da77 CH |
693 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
694 | { | |
695 | struct ccw_device *cdev; | |
696 | ||
697 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
698 | if (cdev) { | |
699 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
700 | GFP_KERNEL | GFP_DMA); | |
701 | if (cdev->private) | |
702 | return cdev; | |
703 | } | |
704 | kfree(cdev); | |
705 | return ERR_PTR(-ENOMEM); | |
706 | } | |
707 | ||
37de53bb PO |
708 | static void ccw_device_todo(struct work_struct *work); |
709 | ||
7674da77 CH |
710 | static int io_subchannel_initialize_dev(struct subchannel *sch, |
711 | struct ccw_device *cdev) | |
712 | { | |
713 | cdev->private->cdev = cdev; | |
714 | atomic_set(&cdev->private->onoff, 0); | |
715 | cdev->dev.parent = &sch->dev; | |
716 | cdev->dev.release = ccw_device_release; | |
37de53bb | 717 | INIT_WORK(&cdev->private->todo_work, ccw_device_todo); |
ef99516c | 718 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
719 | /* Do first half of device_register. */ |
720 | device_initialize(&cdev->dev); | |
721 | if (!get_device(&sch->dev)) { | |
283fdd0b CH |
722 | /* Release reference from device_initialize(). */ |
723 | put_device(&cdev->dev); | |
7674da77 CH |
724 | return -ENODEV; |
725 | } | |
24a1872d | 726 | cdev->private->flags.initialized = 1; |
7674da77 CH |
727 | return 0; |
728 | } | |
729 | ||
730 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
731 | { | |
732 | struct ccw_device *cdev; | |
733 | int ret; | |
734 | ||
735 | cdev = io_subchannel_allocate_dev(sch); | |
736 | if (!IS_ERR(cdev)) { | |
737 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 738 | if (ret) |
7674da77 | 739 | cdev = ERR_PTR(ret); |
7674da77 CH |
740 | } |
741 | return cdev; | |
742 | } | |
743 | ||
736b5db8 | 744 | static void io_subchannel_recog(struct ccw_device *, struct subchannel *); |
d7b5a4c9 | 745 | |
d7b5a4c9 CH |
746 | static void sch_create_and_recog_new_device(struct subchannel *sch) |
747 | { | |
748 | struct ccw_device *cdev; | |
749 | ||
750 | /* Need to allocate a new ccw device. */ | |
751 | cdev = io_subchannel_create_ccwdev(sch); | |
752 | if (IS_ERR(cdev)) { | |
753 | /* OK, we did everything we could... */ | |
754 | css_sch_device_unregister(sch); | |
755 | return; | |
756 | } | |
d7b5a4c9 | 757 | /* Start recognition for the new ccw device. */ |
736b5db8 | 758 | io_subchannel_recog(cdev, sch); |
d7b5a4c9 CH |
759 | } |
760 | ||
1da177e4 LT |
761 | /* |
762 | * Register recognized device. | |
763 | */ | |
37de53bb | 764 | static void io_subchannel_register(struct ccw_device *cdev) |
1da177e4 | 765 | { |
1da177e4 LT |
766 | struct subchannel *sch; |
767 | int ret; | |
768 | unsigned long flags; | |
769 | ||
1da177e4 | 770 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
771 | /* |
772 | * Check if subchannel is still registered. It may have become | |
773 | * unregistered if a machine check hit us after finishing | |
774 | * device recognition but before the register work could be | |
775 | * queued. | |
776 | */ | |
777 | if (!device_is_registered(&sch->dev)) | |
778 | goto out_err; | |
82b7ac05 | 779 | css_update_ssd_info(sch); |
47af5518 CH |
780 | /* |
781 | * io_subchannel_register() will also be called after device | |
782 | * recognition has been done for a boxed device (which will already | |
783 | * be registered). We need to reprobe since we may now have sense id | |
784 | * information. | |
785 | */ | |
d6a30761 | 786 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
787 | if (!cdev->drv) { |
788 | ret = device_reprobe(&cdev->dev); | |
789 | if (ret) | |
790 | /* We can't do much here. */ | |
139b83dd | 791 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
792 | " %d for 0.%x.%04x\n", ret, |
793 | cdev->private->dev_id.ssid, | |
794 | cdev->private->dev_id.devno); | |
47af5518 | 795 | } |
1da177e4 LT |
796 | goto out; |
797 | } | |
fa1a8c23 CH |
798 | /* |
799 | * Now we know this subchannel will stay, we can throw | |
800 | * our delayed uevent. | |
801 | */ | |
f67f129e | 802 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 803 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 LT |
804 | /* make it known to the system */ |
805 | ret = ccw_device_register(cdev); | |
806 | if (ret) { | |
e556bbbd CH |
807 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
808 | cdev->private->dev_id.ssid, | |
809 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 810 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 811 | sch_set_cdev(sch, NULL); |
2ec22984 | 812 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
813 | /* Release initial device reference. */ |
814 | put_device(&cdev->dev); | |
5fb6b854 | 815 | goto out_err; |
1da177e4 | 816 | } |
1da177e4 LT |
817 | out: |
818 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 819 | wake_up(&cdev->private->wait_q); |
5fb6b854 | 820 | out_err: |
1da177e4 LT |
821 | if (atomic_dec_and_test(&ccw_device_init_count)) |
822 | wake_up(&ccw_device_init_wq); | |
823 | } | |
824 | ||
37de53bb | 825 | static void ccw_device_call_sch_unregister(struct ccw_device *cdev) |
1da177e4 | 826 | { |
1da177e4 LT |
827 | struct subchannel *sch; |
828 | ||
46fbe4e4 PO |
829 | /* Get subchannel reference for local processing. */ |
830 | if (!get_device(cdev->dev.parent)) | |
831 | return; | |
1da177e4 | 832 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 833 | css_sch_device_unregister(sch); |
46fbe4e4 | 834 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
835 | put_device(&sch->dev); |
836 | } | |
837 | ||
838 | /* | |
839 | * subchannel recognition done. Called from the state machine. | |
840 | */ | |
841 | void | |
842 | io_subchannel_recog_done(struct ccw_device *cdev) | |
843 | { | |
1da177e4 LT |
844 | if (css_init_done == 0) { |
845 | cdev->private->flags.recog_done = 1; | |
846 | return; | |
847 | } | |
848 | switch (cdev->private->state) { | |
47593bfa SO |
849 | case DEV_STATE_BOXED: |
850 | /* Device did not respond in time. */ | |
1da177e4 LT |
851 | case DEV_STATE_NOT_OPER: |
852 | cdev->private->flags.recog_done = 1; | |
37de53bb PO |
853 | /* Remove device found not operational. */ |
854 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1da177e4 LT |
855 | if (atomic_dec_and_test(&ccw_device_init_count)) |
856 | wake_up(&ccw_device_init_wq); | |
857 | break; | |
1da177e4 LT |
858 | case DEV_STATE_OFFLINE: |
859 | /* | |
860 | * We can't register the device in interrupt context so | |
861 | * we schedule a work item. | |
862 | */ | |
37de53bb | 863 | ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER); |
1da177e4 LT |
864 | break; |
865 | } | |
866 | } | |
867 | ||
736b5db8 | 868 | static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) |
1da177e4 | 869 | { |
1da177e4 LT |
870 | struct ccw_device_private *priv; |
871 | ||
2ec22984 | 872 | cdev->ccwlock = sch->lock; |
fb6958a5 | 873 | |
1da177e4 LT |
874 | /* Init private data. */ |
875 | priv = cdev->private; | |
78964268 CH |
876 | priv->dev_id.devno = sch->schib.pmcw.dev; |
877 | priv->dev_id.ssid = sch->schid.ssid; | |
878 | priv->schid = sch->schid; | |
1da177e4 LT |
879 | priv->state = DEV_STATE_NOT_OPER; |
880 | INIT_LIST_HEAD(&priv->cmb_list); | |
881 | init_waitqueue_head(&priv->wait_q); | |
882 | init_timer(&priv->timer); | |
883 | ||
1da177e4 LT |
884 | /* Increase counter of devices currently in recognition. */ |
885 | atomic_inc(&ccw_device_init_count); | |
886 | ||
887 | /* Start async. device sensing. */ | |
2ec22984 | 888 | spin_lock_irq(sch->lock); |
60e4dac1 | 889 | sch_set_cdev(sch, cdev); |
736b5db8 | 890 | ccw_device_recognition(cdev); |
2ec22984 | 891 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
892 | } |
893 | ||
5d6e6b6f PO |
894 | static int ccw_device_move_to_sch(struct ccw_device *cdev, |
895 | struct subchannel *sch) | |
d7b5a4c9 | 896 | { |
5d6e6b6f | 897 | struct subchannel *old_sch; |
0c609fca | 898 | int rc, old_enabled = 0; |
d7b5a4c9 | 899 | |
5d6e6b6f PO |
900 | old_sch = to_subchannel(cdev->dev.parent); |
901 | /* Obtain child reference for new parent. */ | |
6eff208f | 902 | if (!get_device(&sch->dev)) |
5d6e6b6f | 903 | return -ENODEV; |
0c609fca SO |
904 | |
905 | if (!sch_is_pseudo_sch(old_sch)) { | |
906 | spin_lock_irq(old_sch->lock); | |
907 | old_enabled = old_sch->schib.pmcw.ena; | |
908 | rc = 0; | |
909 | if (old_enabled) | |
910 | rc = cio_disable_subchannel(old_sch); | |
911 | spin_unlock_irq(old_sch->lock); | |
912 | if (rc == -EBUSY) { | |
913 | /* Release child reference for new parent. */ | |
914 | put_device(&sch->dev); | |
915 | return rc; | |
916 | } | |
917 | } | |
918 | ||
d7b5a4c9 | 919 | mutex_lock(&sch->reg_mutex); |
ffa6a705 | 920 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
921 | mutex_unlock(&sch->reg_mutex); |
922 | if (rc) { | |
5d6e6b6f | 923 | CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", |
d7b5a4c9 CH |
924 | cdev->private->dev_id.ssid, |
925 | cdev->private->dev_id.devno, sch->schid.ssid, | |
5d6e6b6f | 926 | sch->schib.pmcw.dev, rc); |
0c609fca SO |
927 | if (old_enabled) { |
928 | /* Try to reenable the old subchannel. */ | |
929 | spin_lock_irq(old_sch->lock); | |
930 | cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch); | |
931 | spin_unlock_irq(old_sch->lock); | |
932 | } | |
5d6e6b6f | 933 | /* Release child reference for new parent. */ |
6eff208f | 934 | put_device(&sch->dev); |
5d6e6b6f | 935 | return rc; |
d7b5a4c9 | 936 | } |
5d6e6b6f PO |
937 | /* Clean up old subchannel. */ |
938 | if (!sch_is_pseudo_sch(old_sch)) { | |
939 | spin_lock_irq(old_sch->lock); | |
940 | sch_set_cdev(old_sch, NULL); | |
5d6e6b6f PO |
941 | spin_unlock_irq(old_sch->lock); |
942 | css_schedule_eval(old_sch->schid); | |
d7b5a4c9 | 943 | } |
5d6e6b6f PO |
944 | /* Release child reference for old parent. */ |
945 | put_device(&old_sch->dev); | |
946 | /* Initialize new subchannel. */ | |
947 | spin_lock_irq(sch->lock); | |
948 | cdev->private->schid = sch->schid; | |
949 | cdev->ccwlock = sch->lock; | |
950 | if (!sch_is_pseudo_sch(sch)) | |
951 | sch_set_cdev(sch, cdev); | |
952 | spin_unlock_irq(sch->lock); | |
953 | if (!sch_is_pseudo_sch(sch)) | |
954 | css_update_ssd_info(sch); | |
955 | return 0; | |
956 | } | |
957 | ||
958 | static int ccw_device_move_to_orph(struct ccw_device *cdev) | |
959 | { | |
960 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
961 | struct channel_subsystem *css = to_css(sch->dev.parent); | |
962 | ||
963 | return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); | |
d7b5a4c9 CH |
964 | } |
965 | ||
602b20f2 CH |
966 | static void io_subchannel_irq(struct subchannel *sch) |
967 | { | |
968 | struct ccw_device *cdev; | |
969 | ||
db6a6423 | 970 | cdev = sch_get_cdev(sch); |
602b20f2 | 971 | |
efd986db SO |
972 | CIO_TRACE_EVENT(6, "IRQ"); |
973 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
974 | if (cdev) |
975 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
976 | } | |
977 | ||
13952ec1 SO |
978 | void io_subchannel_init_config(struct subchannel *sch) |
979 | { | |
980 | memset(&sch->config, 0, sizeof(sch->config)); | |
981 | sch->config.csense = 1; | |
13952ec1 SO |
982 | } |
983 | ||
0ae7a7b2 CH |
984 | static void io_subchannel_init_fields(struct subchannel *sch) |
985 | { | |
986 | if (cio_is_console(sch->schid)) | |
987 | sch->opm = 0xff; | |
988 | else | |
989 | sch->opm = chp_get_sch_opm(sch); | |
990 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 991 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
992 | |
993 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
994 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
995 | sch->schib.pmcw.dev, sch->schid.ssid, | |
996 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
997 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
998 | |
999 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1000 | } |
1001 | ||
90ed2b69 CH |
1002 | /* |
1003 | * Note: We always return 0 so that we bind to the device even on error. | |
1004 | * This is needed so that our remove function is called on unregister. | |
1005 | */ | |
0ae7a7b2 | 1006 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1007 | { |
1da177e4 LT |
1008 | struct ccw_device *cdev; |
1009 | int rc; | |
1da177e4 | 1010 | |
6d7c5afc | 1011 | if (cio_is_console(sch->schid)) { |
7e9db9ea CH |
1012 | rc = sysfs_create_group(&sch->dev.kobj, |
1013 | &io_subchannel_attr_group); | |
1014 | if (rc) | |
1015 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1016 | "attributes for subchannel " | |
1017 | "0.%x.%04x (rc=%d)\n", | |
1018 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 | 1019 | /* |
6d7c5afc | 1020 | * The console subchannel already has an associated ccw_device. |
7e9db9ea | 1021 | * Throw the delayed uevent for the subchannel, register |
6d7c5afc | 1022 | * the ccw_device and exit. |
1da177e4 | 1023 | */ |
f67f129e | 1024 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1025 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
6d7c5afc | 1026 | cdev = sch_get_cdev(sch); |
e1031786 | 1027 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 | 1028 | device_initialize(&cdev->dev); |
24a1872d | 1029 | cdev->private->flags.initialized = 1; |
1da177e4 | 1030 | ccw_device_register(cdev); |
1da177e4 LT |
1031 | /* |
1032 | * Check if the device is already online. If it is | |
9cd67421 CH |
1033 | * the reference count needs to be corrected since we |
1034 | * didn't obtain a reference in ccw_device_set_online. | |
1da177e4 LT |
1035 | */ |
1036 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1037 | cdev->private->state != DEV_STATE_OFFLINE && | |
1038 | cdev->private->state != DEV_STATE_BOXED) | |
1039 | get_device(&cdev->dev); | |
1040 | return 0; | |
1041 | } | |
0ae7a7b2 | 1042 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1043 | rc = cio_commit_config(sch); |
1044 | if (rc) | |
1045 | goto out_schedule; | |
7e9db9ea CH |
1046 | rc = sysfs_create_group(&sch->dev.kobj, |
1047 | &io_subchannel_attr_group); | |
1048 | if (rc) | |
90ed2b69 | 1049 | goto out_schedule; |
cd6b4f27 CH |
1050 | /* Allocate I/O subchannel private data. */ |
1051 | sch->private = kzalloc(sizeof(struct io_subchannel_private), | |
1052 | GFP_KERNEL | GFP_DMA); | |
90ed2b69 | 1053 | if (!sch->private) |
48e4c385 | 1054 | goto out_schedule; |
5d6e6b6f | 1055 | css_schedule_eval(sch->schid); |
7e9db9ea | 1056 | return 0; |
48e4c385 | 1057 | |
90ed2b69 | 1058 | out_schedule: |
390935ac PO |
1059 | spin_lock_irq(sch->lock); |
1060 | css_sched_sch_todo(sch, SCH_TODO_UNREG); | |
1061 | spin_unlock_irq(sch->lock); | |
90ed2b69 | 1062 | return 0; |
1da177e4 LT |
1063 | } |
1064 | ||
1da177e4 | 1065 | static int |
8bbace7e | 1066 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1067 | { |
1068 | struct ccw_device *cdev; | |
1da177e4 | 1069 | |
db6a6423 CH |
1070 | cdev = sch_get_cdev(sch); |
1071 | if (!cdev) | |
48e4c385 | 1072 | goto out_free; |
6e9a0f67 | 1073 | io_subchannel_quiesce(sch); |
1da177e4 | 1074 | /* Set ccw device to not operational and drop reference. */ |
7a8ad100 | 1075 | spin_lock_irq(cdev->ccwlock); |
db6a6423 | 1076 | sch_set_cdev(sch, NULL); |
1da177e4 | 1077 | cdev->private->state = DEV_STATE_NOT_OPER; |
7a8ad100 | 1078 | spin_unlock_irq(cdev->ccwlock); |
ef99516c | 1079 | ccw_device_unregister(cdev); |
48e4c385 | 1080 | out_free: |
cd6b4f27 | 1081 | kfree(sch->private); |
7e9db9ea | 1082 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1083 | return 0; |
1084 | } | |
1085 | ||
602b20f2 | 1086 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1087 | { |
1088 | struct ccw_device *cdev; | |
1089 | ||
db6a6423 | 1090 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1091 | if (cdev) |
1092 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1093 | } | |
1094 | ||
c820de39 CH |
1095 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1096 | { | |
1097 | struct ccw_device *cdev; | |
1098 | ||
1099 | cdev = sch_get_cdev(sch); | |
1100 | if (!cdev) | |
1101 | return; | |
4257aaec PO |
1102 | if (cio_update_schib(sch)) |
1103 | goto err; | |
1104 | /* Check for I/O on path. */ | |
1105 | if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask) | |
1106 | goto out; | |
1107 | if (cdev->private->state == DEV_STATE_ONLINE) { | |
1108 | ccw_device_kill_io(cdev); | |
1109 | goto out; | |
1110 | } | |
1111 | if (cio_clear(sch)) | |
1112 | goto err; | |
1113 | out: | |
1114 | /* Trigger path verification. */ | |
1115 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1116 | return; | |
c820de39 | 1117 | |
4257aaec PO |
1118 | err: |
1119 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
c820de39 CH |
1120 | } |
1121 | ||
99611f87 CH |
1122 | static int io_subchannel_chp_event(struct subchannel *sch, |
1123 | struct chp_link *link, int event) | |
c820de39 CH |
1124 | { |
1125 | int mask; | |
c820de39 | 1126 | |
99611f87 | 1127 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1128 | if (!mask) |
1129 | return 0; | |
1130 | switch (event) { | |
1131 | case CHP_VARY_OFF: | |
1132 | sch->opm &= ~mask; | |
1133 | sch->lpm &= ~mask; | |
1134 | io_subchannel_terminate_path(sch, mask); | |
1135 | break; | |
1136 | case CHP_VARY_ON: | |
1137 | sch->opm |= mask; | |
1138 | sch->lpm |= mask; | |
1139 | io_subchannel_verify(sch); | |
1140 | break; | |
1141 | case CHP_OFFLINE: | |
cdb912a4 | 1142 | if (cio_update_schib(sch)) |
c820de39 CH |
1143 | return -ENODEV; |
1144 | io_subchannel_terminate_path(sch, mask); | |
1145 | break; | |
1146 | case CHP_ONLINE: | |
cdb912a4 SO |
1147 | if (cio_update_schib(sch)) |
1148 | return -ENODEV; | |
c820de39 CH |
1149 | sch->lpm |= mask & sch->opm; |
1150 | io_subchannel_verify(sch); | |
1151 | break; | |
1152 | } | |
1153 | return 0; | |
1154 | } | |
1155 | ||
6e9a0f67 | 1156 | static void io_subchannel_quiesce(struct subchannel *sch) |
1da177e4 | 1157 | { |
1da177e4 LT |
1158 | struct ccw_device *cdev; |
1159 | int ret; | |
1160 | ||
56e6b796 | 1161 | spin_lock_irq(sch->lock); |
db6a6423 | 1162 | cdev = sch_get_cdev(sch); |
a8237fc4 | 1163 | if (cio_is_console(sch->schid)) |
56e6b796 | 1164 | goto out_unlock; |
1da177e4 | 1165 | if (!sch->schib.pmcw.ena) |
56e6b796 | 1166 | goto out_unlock; |
1da177e4 LT |
1167 | ret = cio_disable_subchannel(sch); |
1168 | if (ret != -EBUSY) | |
56e6b796 | 1169 | goto out_unlock; |
1da177e4 | 1170 | if (cdev->handler) |
56e6b796 SO |
1171 | cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO)); |
1172 | while (ret == -EBUSY) { | |
1173 | cdev->private->state = DEV_STATE_QUIESCE; | |
1174 | ret = ccw_device_cancel_halt_clear(cdev); | |
1175 | if (ret == -EBUSY) { | |
1176 | ccw_device_set_timeout(cdev, HZ/10); | |
1177 | spin_unlock_irq(sch->lock); | |
1178 | wait_event(cdev->private->wait_q, | |
1179 | cdev->private->state != DEV_STATE_QUIESCE); | |
1180 | spin_lock_irq(sch->lock); | |
1181 | } | |
1182 | ret = cio_disable_subchannel(sch); | |
1da177e4 | 1183 | } |
56e6b796 SO |
1184 | out_unlock: |
1185 | spin_unlock_irq(sch->lock); | |
1da177e4 LT |
1186 | } |
1187 | ||
6e9a0f67 SO |
1188 | static void io_subchannel_shutdown(struct subchannel *sch) |
1189 | { | |
1190 | io_subchannel_quiesce(sch); | |
1191 | } | |
1192 | ||
c820de39 CH |
1193 | static int device_is_disconnected(struct ccw_device *cdev) |
1194 | { | |
1195 | if (!cdev) | |
1196 | return 0; | |
1197 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1198 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1199 | } | |
1200 | ||
1201 | static int recovery_check(struct device *dev, void *data) | |
1202 | { | |
1203 | struct ccw_device *cdev = to_ccwdev(dev); | |
1204 | int *redo = data; | |
1205 | ||
1206 | spin_lock_irq(cdev->ccwlock); | |
1207 | switch (cdev->private->state) { | |
1208 | case DEV_STATE_DISCONNECTED: | |
1209 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1210 | cdev->private->dev_id.ssid, | |
1211 | cdev->private->dev_id.devno); | |
1212 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1213 | *redo = 1; | |
1214 | break; | |
1215 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1216 | *redo = 1; | |
1217 | break; | |
1218 | } | |
1219 | spin_unlock_irq(cdev->ccwlock); | |
1220 | ||
1221 | return 0; | |
1222 | } | |
1223 | ||
1224 | static void recovery_work_func(struct work_struct *unused) | |
1225 | { | |
1226 | int redo = 0; | |
1227 | ||
1228 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1229 | if (redo) { | |
1230 | spin_lock_irq(&recovery_lock); | |
1231 | if (!timer_pending(&recovery_timer)) { | |
1232 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1233 | recovery_phase++; | |
1234 | mod_timer(&recovery_timer, jiffies + | |
1235 | recovery_delay[recovery_phase] * HZ); | |
1236 | } | |
1237 | spin_unlock_irq(&recovery_lock); | |
1238 | } else | |
1239 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1240 | } | |
1241 | ||
1242 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1243 | ||
1244 | static void recovery_func(unsigned long data) | |
1245 | { | |
1246 | /* | |
1247 | * We can't do our recovery in softirq context and it's not | |
1248 | * performance critical, so we schedule it. | |
1249 | */ | |
1250 | schedule_work(&recovery_work); | |
1251 | } | |
1252 | ||
1253 | static void ccw_device_schedule_recovery(void) | |
1254 | { | |
1255 | unsigned long flags; | |
1256 | ||
1257 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1258 | spin_lock_irqsave(&recovery_lock, flags); | |
1259 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1260 | recovery_phase = 0; | |
1261 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1262 | } | |
1263 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1264 | } | |
1265 | ||
ecf5d9ef PO |
1266 | static int purge_fn(struct device *dev, void *data) |
1267 | { | |
1268 | struct ccw_device *cdev = to_ccwdev(dev); | |
37de53bb | 1269 | struct ccw_dev_id *id = &cdev->private->dev_id; |
ecf5d9ef PO |
1270 | |
1271 | spin_lock_irq(cdev->ccwlock); | |
37de53bb PO |
1272 | if (is_blacklisted(id->ssid, id->devno) && |
1273 | (cdev->private->state == DEV_STATE_OFFLINE)) { | |
1274 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid, | |
1275 | id->devno); | |
1276 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1277 | } | |
ecf5d9ef | 1278 | spin_unlock_irq(cdev->ccwlock); |
ecf5d9ef PO |
1279 | /* Abort loop in case of pending signal. */ |
1280 | if (signal_pending(current)) | |
1281 | return -EINTR; | |
1282 | ||
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | /** | |
1287 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1288 | * | |
1289 | * Unregister all ccw devices that are offline and on the blacklist. | |
1290 | */ | |
1291 | int ccw_purge_blacklisted(void) | |
1292 | { | |
1293 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1294 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1295 | return 0; | |
1296 | } | |
1297 | ||
6afcc775 | 1298 | void ccw_device_set_disconnected(struct ccw_device *cdev) |
c820de39 CH |
1299 | { |
1300 | if (!cdev) | |
1301 | return; | |
1302 | ccw_device_set_timeout(cdev, 0); | |
1303 | cdev->private->flags.fake_irb = 0; | |
1304 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1305 | if (cdev->online) | |
1306 | ccw_device_schedule_recovery(); | |
1307 | } | |
1308 | ||
91c36919 PO |
1309 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1310 | { | |
1311 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1312 | ||
1313 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1314 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1315 | ccw_device_set_timeout(cdev, 0); |
1316 | cio_disable_subchannel(sch); | |
1317 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1318 | } | |
1319 | ||
5d6e6b6f PO |
1320 | enum io_sch_action { |
1321 | IO_SCH_UNREG, | |
1322 | IO_SCH_ORPH_UNREG, | |
1323 | IO_SCH_ATTACH, | |
1324 | IO_SCH_UNREG_ATTACH, | |
1325 | IO_SCH_ORPH_ATTACH, | |
1326 | IO_SCH_REPROBE, | |
1327 | IO_SCH_VERIFY, | |
1328 | IO_SCH_DISC, | |
1329 | IO_SCH_NOP, | |
1330 | }; | |
1331 | ||
1332 | static enum io_sch_action sch_get_action(struct subchannel *sch) | |
1333 | { | |
1334 | struct ccw_device *cdev; | |
1335 | ||
1336 | cdev = sch_get_cdev(sch); | |
1337 | if (cio_update_schib(sch)) { | |
1338 | /* Not operational. */ | |
1339 | if (!cdev) | |
1340 | return IO_SCH_UNREG; | |
76e6fb4b | 1341 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1342 | return IO_SCH_UNREG; |
1343 | return IO_SCH_ORPH_UNREG; | |
1344 | } | |
1345 | /* Operational. */ | |
1346 | if (!cdev) | |
1347 | return IO_SCH_ATTACH; | |
1348 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
76e6fb4b | 1349 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1350 | return IO_SCH_UNREG_ATTACH; |
1351 | return IO_SCH_ORPH_ATTACH; | |
1352 | } | |
1353 | if ((sch->schib.pmcw.pam & sch->opm) == 0) { | |
76e6fb4b | 1354 | if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) |
5d6e6b6f PO |
1355 | return IO_SCH_UNREG; |
1356 | return IO_SCH_DISC; | |
1357 | } | |
1358 | if (device_is_disconnected(cdev)) | |
1359 | return IO_SCH_REPROBE; | |
1360 | if (cdev->online) | |
1361 | return IO_SCH_VERIFY; | |
1362 | return IO_SCH_NOP; | |
1363 | } | |
1364 | ||
1365 | /** | |
1366 | * io_subchannel_sch_event - process subchannel event | |
1367 | * @sch: subchannel | |
1368 | * @process: non-zero if function is called in process context | |
1369 | * | |
1370 | * An unspecified event occurred for this subchannel. Adjust data according | |
1371 | * to the current operational state of the subchannel and device. Return | |
1372 | * zero when the event has been handled sufficiently or -EAGAIN when this | |
1373 | * function should be called again in process context. | |
1374 | */ | |
1375 | static int io_subchannel_sch_event(struct subchannel *sch, int process) | |
c820de39 | 1376 | { |
c820de39 | 1377 | unsigned long flags; |
c820de39 | 1378 | struct ccw_device *cdev; |
5d6e6b6f PO |
1379 | struct ccw_dev_id dev_id; |
1380 | enum io_sch_action action; | |
1381 | int rc = -EAGAIN; | |
c820de39 CH |
1382 | |
1383 | spin_lock_irqsave(sch->lock, flags); | |
5d6e6b6f PO |
1384 | if (!device_is_registered(&sch->dev)) |
1385 | goto out_unlock; | |
390935ac PO |
1386 | if (work_pending(&sch->todo_work)) |
1387 | goto out_unlock; | |
37de53bb PO |
1388 | cdev = sch_get_cdev(sch); |
1389 | if (cdev && work_pending(&cdev->private->todo_work)) | |
1390 | goto out_unlock; | |
5d6e6b6f PO |
1391 | action = sch_get_action(sch); |
1392 | CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", | |
1393 | sch->schid.ssid, sch->schid.sch_no, process, | |
1394 | action); | |
1395 | /* Perform immediate actions while holding the lock. */ | |
5d6e6b6f PO |
1396 | switch (action) { |
1397 | case IO_SCH_REPROBE: | |
1398 | /* Trigger device recognition. */ | |
1399 | ccw_device_trigger_reprobe(cdev); | |
1400 | rc = 0; | |
1401 | goto out_unlock; | |
1402 | case IO_SCH_VERIFY: | |
0d01bb89 SO |
1403 | if (cdev->private->flags.resuming == 1) { |
1404 | if (cio_enable_subchannel(sch, (u32)(addr_t)sch)) { | |
1405 | ccw_device_set_notoper(cdev); | |
1406 | break; | |
1407 | } | |
1408 | } | |
5d6e6b6f PO |
1409 | /* Trigger path verification. */ |
1410 | io_subchannel_verify(sch); | |
1411 | rc = 0; | |
1412 | goto out_unlock; | |
1413 | case IO_SCH_DISC: | |
1414 | ccw_device_set_disconnected(cdev); | |
1415 | rc = 0; | |
1416 | goto out_unlock; | |
1417 | case IO_SCH_ORPH_UNREG: | |
1418 | case IO_SCH_ORPH_ATTACH: | |
1419 | ccw_device_set_disconnected(cdev); | |
1420 | break; | |
1421 | case IO_SCH_UNREG_ATTACH: | |
1422 | case IO_SCH_UNREG: | |
1423 | if (cdev) | |
1424 | ccw_device_set_notoper(cdev); | |
1425 | break; | |
1426 | case IO_SCH_NOP: | |
1427 | rc = 0; | |
1428 | goto out_unlock; | |
1429 | default: | |
1430 | break; | |
c820de39 | 1431 | } |
5d6e6b6f PO |
1432 | spin_unlock_irqrestore(sch->lock, flags); |
1433 | /* All other actions require process context. */ | |
1434 | if (!process) | |
1435 | goto out; | |
1436 | /* Handle attached ccw device. */ | |
1437 | switch (action) { | |
1438 | case IO_SCH_ORPH_UNREG: | |
1439 | case IO_SCH_ORPH_ATTACH: | |
1440 | /* Move ccw device to orphanage. */ | |
1441 | rc = ccw_device_move_to_orph(cdev); | |
1442 | if (rc) | |
1443 | goto out; | |
c820de39 | 1444 | break; |
5d6e6b6f PO |
1445 | case IO_SCH_UNREG_ATTACH: |
1446 | /* Unregister ccw device. */ | |
0d01bb89 SO |
1447 | if (!cdev->private->flags.resuming) |
1448 | ccw_device_unregister(cdev); | |
c820de39 | 1449 | break; |
5d6e6b6f | 1450 | default: |
c820de39 CH |
1451 | break; |
1452 | } | |
5d6e6b6f | 1453 | /* Handle subchannel. */ |
c820de39 | 1454 | switch (action) { |
5d6e6b6f PO |
1455 | case IO_SCH_ORPH_UNREG: |
1456 | case IO_SCH_UNREG: | |
0d01bb89 SO |
1457 | if (!cdev || !cdev->private->flags.resuming) |
1458 | css_sch_device_unregister(sch); | |
c820de39 | 1459 | break; |
5d6e6b6f PO |
1460 | case IO_SCH_ORPH_ATTACH: |
1461 | case IO_SCH_UNREG_ATTACH: | |
1462 | case IO_SCH_ATTACH: | |
1463 | dev_id.ssid = sch->schid.ssid; | |
1464 | dev_id.devno = sch->schib.pmcw.dev; | |
1465 | cdev = get_ccwdev_by_dev_id(&dev_id); | |
1466 | if (!cdev) { | |
1467 | sch_create_and_recog_new_device(sch); | |
1468 | break; | |
1469 | } | |
1470 | rc = ccw_device_move_to_sch(cdev, sch); | |
1471 | if (rc) { | |
1472 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1473 | put_device(&cdev->dev); | |
1474 | goto out; | |
1475 | } | |
1476 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 | 1477 | ccw_device_trigger_reprobe(cdev); |
5d6e6b6f PO |
1478 | spin_unlock_irqrestore(sch->lock, flags); |
1479 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1480 | put_device(&cdev->dev); | |
91c36919 | 1481 | break; |
c820de39 CH |
1482 | default: |
1483 | break; | |
1484 | } | |
5d6e6b6f | 1485 | return 0; |
c820de39 | 1486 | |
5d6e6b6f PO |
1487 | out_unlock: |
1488 | spin_unlock_irqrestore(sch->lock, flags); | |
1489 | out: | |
1490 | return rc; | |
c820de39 CH |
1491 | } |
1492 | ||
1da177e4 LT |
1493 | #ifdef CONFIG_CCW_CONSOLE |
1494 | static struct ccw_device console_cdev; | |
1495 | static struct ccw_device_private console_private; | |
1496 | static int console_cdev_in_use; | |
1497 | ||
2ec22984 CH |
1498 | static DEFINE_SPINLOCK(ccw_console_lock); |
1499 | ||
1500 | spinlock_t * cio_get_console_lock(void) | |
1501 | { | |
1502 | return &ccw_console_lock; | |
1503 | } | |
1504 | ||
0ae7a7b2 CH |
1505 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1506 | struct subchannel *sch) | |
1da177e4 LT |
1507 | { |
1508 | int rc; | |
1509 | ||
cd6b4f27 CH |
1510 | /* Attach subchannel private data. */ |
1511 | sch->private = cio_get_console_priv(); | |
1512 | memset(sch->private, 0, sizeof(struct io_subchannel_private)); | |
0ae7a7b2 | 1513 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1514 | rc = cio_commit_config(sch); |
1515 | if (rc) | |
1516 | return rc; | |
0ae7a7b2 | 1517 | sch->driver = &io_subchannel_driver; |
1da177e4 | 1518 | /* Initialize the ccw_device structure. */ |
292888c8 | 1519 | cdev->dev.parent= &sch->dev; |
ffa8d2a3 | 1520 | sch_set_cdev(sch, cdev); |
736b5db8 | 1521 | io_subchannel_recog(cdev, sch); |
1da177e4 LT |
1522 | /* Now wait for the async. recognition to come to an end. */ |
1523 | spin_lock_irq(cdev->ccwlock); | |
1524 | while (!dev_fsm_final_state(cdev)) | |
1525 | wait_cons_dev(); | |
1526 | rc = -EIO; | |
1527 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1528 | goto out_unlock; | |
1529 | ccw_device_online(cdev); | |
1530 | while (!dev_fsm_final_state(cdev)) | |
1531 | wait_cons_dev(); | |
1532 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1533 | goto out_unlock; | |
1534 | rc = 0; | |
1535 | out_unlock: | |
1536 | spin_unlock_irq(cdev->ccwlock); | |
736b5db8 | 1537 | return rc; |
1da177e4 LT |
1538 | } |
1539 | ||
1540 | struct ccw_device * | |
1541 | ccw_device_probe_console(void) | |
1542 | { | |
1543 | struct subchannel *sch; | |
1544 | int ret; | |
1545 | ||
1546 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1547 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1548 | sch = cio_probe_console(); |
1549 | if (IS_ERR(sch)) { | |
1550 | console_cdev_in_use = 0; | |
1551 | return (void *) sch; | |
1552 | } | |
1553 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1554 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1555 | console_cdev.private = &console_private; | |
c1637532 | 1556 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1557 | ret = ccw_device_console_enable(&console_cdev, sch); |
1558 | if (ret) { | |
1559 | cio_release_console(); | |
1560 | console_cdev_in_use = 0; | |
1561 | return ERR_PTR(ret); | |
1562 | } | |
1563 | console_cdev.online = 1; | |
1564 | return &console_cdev; | |
1565 | } | |
1f4e7eda | 1566 | |
6664845c MS |
1567 | static int ccw_device_pm_restore(struct device *dev); |
1568 | ||
1569 | int ccw_device_force_console(void) | |
1570 | { | |
1571 | if (!console_cdev_in_use) | |
1572 | return -ENODEV; | |
1573 | return ccw_device_pm_restore(&console_cdev.dev); | |
1574 | } | |
1575 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1576 | #endif |
1577 | ||
1578 | /* | |
1579 | * get ccw_device matching the busid, but only if owned by cdrv | |
1580 | */ | |
b0744bd2 CH |
1581 | static int |
1582 | __ccwdev_check_busid(struct device *dev, void *id) | |
1583 | { | |
1584 | char *bus_id; | |
1585 | ||
12975aef | 1586 | bus_id = id; |
b0744bd2 | 1587 | |
98df67b3 | 1588 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1589 | } |
1590 | ||
1591 | ||
b2ffd8e9 CH |
1592 | /** |
1593 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1594 | * @cdrv: driver the device is owned by | |
1595 | * @bus_id: bus id of the device to be searched | |
1596 | * | |
1597 | * This function searches all devices owned by @cdrv for a device with a bus | |
1598 | * id matching @bus_id. | |
1599 | * Returns: | |
1600 | * If a match is found, its reference count of the found device is increased | |
1601 | * and it is returned; else %NULL is returned. | |
1602 | */ | |
1603 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1604 | const char *bus_id) | |
1da177e4 | 1605 | { |
b0744bd2 | 1606 | struct device *dev; |
1da177e4 LT |
1607 | struct device_driver *drv; |
1608 | ||
1609 | drv = get_driver(&cdrv->driver); | |
1610 | if (!drv) | |
b0744bd2 | 1611 | return NULL; |
1da177e4 | 1612 | |
b0744bd2 CH |
1613 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1614 | __ccwdev_check_busid); | |
1da177e4 LT |
1615 | put_driver(drv); |
1616 | ||
d2c993d8 | 1617 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1618 | } |
1619 | ||
1620 | /************************** device driver handling ************************/ | |
1621 | ||
1622 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1623 | * and release methods are initially very similar to the device_driver | |
1624 | * implementations, with the difference that they have ccw_device | |
1625 | * arguments. | |
1626 | * | |
1627 | * A ccw driver also contains the information that is needed for | |
1628 | * device matching. | |
1629 | */ | |
1630 | static int | |
1631 | ccw_device_probe (struct device *dev) | |
1632 | { | |
1633 | struct ccw_device *cdev = to_ccwdev(dev); | |
1634 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1635 | int ret; | |
1636 | ||
1637 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1638 | ||
1639 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1640 | ||
1641 | if (ret) { | |
d2c993d8 | 1642 | cdev->drv = NULL; |
1da177e4 LT |
1643 | return ret; |
1644 | } | |
1645 | ||
1646 | return 0; | |
1647 | } | |
1648 | ||
1649 | static int | |
1650 | ccw_device_remove (struct device *dev) | |
1651 | { | |
1652 | struct ccw_device *cdev = to_ccwdev(dev); | |
1653 | struct ccw_driver *cdrv = cdev->drv; | |
1654 | int ret; | |
1655 | ||
1da177e4 LT |
1656 | if (cdrv->remove) |
1657 | cdrv->remove(cdev); | |
1658 | if (cdev->online) { | |
1659 | cdev->online = 0; | |
1660 | spin_lock_irq(cdev->ccwlock); | |
1661 | ret = ccw_device_offline(cdev); | |
1662 | spin_unlock_irq(cdev->ccwlock); | |
1663 | if (ret == 0) | |
1664 | wait_event(cdev->private->wait_q, | |
1665 | dev_fsm_final_state(cdev)); | |
1666 | else | |
139b83dd | 1667 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1668 | "device 0.%x.%04x\n", |
1669 | ret, cdev->private->dev_id.ssid, | |
1670 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1671 | /* Give up reference obtained in ccw_device_set_online(). */ |
1672 | put_device(&cdev->dev); | |
1da177e4 LT |
1673 | } |
1674 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1675 | cdev->drv = NULL; |
1da177e4 LT |
1676 | return 0; |
1677 | } | |
1678 | ||
958974fb CH |
1679 | static void ccw_device_shutdown(struct device *dev) |
1680 | { | |
1681 | struct ccw_device *cdev; | |
1682 | ||
1683 | cdev = to_ccwdev(dev); | |
1684 | if (cdev->drv && cdev->drv->shutdown) | |
1685 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1686 | disable_cmf(cdev); |
958974fb CH |
1687 | } |
1688 | ||
823d494a SO |
1689 | static int ccw_device_pm_prepare(struct device *dev) |
1690 | { | |
1691 | struct ccw_device *cdev = to_ccwdev(dev); | |
1692 | ||
37de53bb | 1693 | if (work_pending(&cdev->private->todo_work)) |
823d494a SO |
1694 | return -EAGAIN; |
1695 | /* Fail while device is being set online/offline. */ | |
1696 | if (atomic_read(&cdev->private->onoff)) | |
1697 | return -EAGAIN; | |
1698 | ||
1699 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1700 | return cdev->drv->prepare(cdev); | |
1701 | ||
1702 | return 0; | |
1703 | } | |
1704 | ||
1705 | static void ccw_device_pm_complete(struct device *dev) | |
1706 | { | |
1707 | struct ccw_device *cdev = to_ccwdev(dev); | |
1708 | ||
1709 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1710 | cdev->drv->complete(cdev); | |
1711 | } | |
1712 | ||
1713 | static int ccw_device_pm_freeze(struct device *dev) | |
1714 | { | |
1715 | struct ccw_device *cdev = to_ccwdev(dev); | |
1716 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1717 | int ret, cm_enabled; | |
1718 | ||
1719 | /* Fail suspend while device is in transistional state. */ | |
1720 | if (!dev_fsm_final_state(cdev)) | |
1721 | return -EAGAIN; | |
1722 | if (!cdev->online) | |
1723 | return 0; | |
1724 | if (cdev->drv && cdev->drv->freeze) { | |
1725 | ret = cdev->drv->freeze(cdev); | |
1726 | if (ret) | |
1727 | return ret; | |
1728 | } | |
1729 | ||
1730 | spin_lock_irq(sch->lock); | |
1731 | cm_enabled = cdev->private->cmb != NULL; | |
1732 | spin_unlock_irq(sch->lock); | |
1733 | if (cm_enabled) { | |
1734 | /* Don't have the css write on memory. */ | |
1735 | ret = ccw_set_cmf(cdev, 0); | |
1736 | if (ret) | |
1737 | return ret; | |
1738 | } | |
1739 | /* From here on, disallow device driver I/O. */ | |
1740 | spin_lock_irq(sch->lock); | |
1741 | ret = cio_disable_subchannel(sch); | |
1742 | spin_unlock_irq(sch->lock); | |
1743 | ||
1744 | return ret; | |
1745 | } | |
1746 | ||
1747 | static int ccw_device_pm_thaw(struct device *dev) | |
1748 | { | |
1749 | struct ccw_device *cdev = to_ccwdev(dev); | |
1750 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1751 | int ret, cm_enabled; | |
1752 | ||
1753 | if (!cdev->online) | |
1754 | return 0; | |
1755 | ||
1756 | spin_lock_irq(sch->lock); | |
1757 | /* Allow device driver I/O again. */ | |
1758 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1759 | cm_enabled = cdev->private->cmb != NULL; | |
1760 | spin_unlock_irq(sch->lock); | |
1761 | if (ret) | |
1762 | return ret; | |
1763 | ||
1764 | if (cm_enabled) { | |
1765 | ret = ccw_set_cmf(cdev, 1); | |
1766 | if (ret) | |
1767 | return ret; | |
1768 | } | |
1769 | ||
1770 | if (cdev->drv && cdev->drv->thaw) | |
1771 | ret = cdev->drv->thaw(cdev); | |
1772 | ||
1773 | return ret; | |
1774 | } | |
1775 | ||
1776 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
1777 | { | |
1778 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
823d494a | 1779 | |
0d01bb89 SO |
1780 | spin_lock_irq(sch->lock); |
1781 | if (cio_is_console(sch->schid)) { | |
1782 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1783 | goto out_unlock; | |
1784 | } | |
823d494a SO |
1785 | /* |
1786 | * While we were sleeping, devices may have gone or become | |
1787 | * available again. Kick re-detection. | |
1788 | */ | |
823d494a | 1789 | cdev->private->flags.resuming = 1; |
0d01bb89 SO |
1790 | css_schedule_eval(sch->schid); |
1791 | spin_unlock_irq(sch->lock); | |
1792 | css_complete_work(); | |
1793 | ||
1794 | /* cdev may have been moved to a different subchannel. */ | |
1795 | sch = to_subchannel(cdev->dev.parent); | |
1796 | spin_lock_irq(sch->lock); | |
1797 | if (cdev->private->state != DEV_STATE_ONLINE && | |
1798 | cdev->private->state != DEV_STATE_OFFLINE) | |
1799 | goto out_unlock; | |
1800 | ||
736b5db8 | 1801 | ccw_device_recognition(cdev); |
823d494a | 1802 | spin_unlock_irq(sch->lock); |
823d494a SO |
1803 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || |
1804 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
0d01bb89 SO |
1805 | spin_lock_irq(sch->lock); |
1806 | ||
1807 | out_unlock: | |
823d494a | 1808 | cdev->private->flags.resuming = 0; |
0d01bb89 | 1809 | spin_unlock_irq(sch->lock); |
823d494a SO |
1810 | } |
1811 | ||
1812 | static int resume_handle_boxed(struct ccw_device *cdev) | |
1813 | { | |
1814 | cdev->private->state = DEV_STATE_BOXED; | |
76e6fb4b | 1815 | if (ccw_device_notify(cdev, CIO_BOXED) == NOTIFY_OK) |
823d494a | 1816 | return 0; |
37de53bb | 1817 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1818 | return -ENODEV; |
1819 | } | |
1820 | ||
1821 | static int resume_handle_disc(struct ccw_device *cdev) | |
1822 | { | |
1823 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
76e6fb4b | 1824 | if (ccw_device_notify(cdev, CIO_GONE) == NOTIFY_OK) |
823d494a | 1825 | return 0; |
37de53bb | 1826 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1827 | return -ENODEV; |
1828 | } | |
1829 | ||
1830 | static int ccw_device_pm_restore(struct device *dev) | |
1831 | { | |
1832 | struct ccw_device *cdev = to_ccwdev(dev); | |
0d01bb89 SO |
1833 | struct subchannel *sch; |
1834 | int ret = 0; | |
823d494a SO |
1835 | |
1836 | __ccw_device_pm_restore(cdev); | |
0d01bb89 | 1837 | sch = to_subchannel(cdev->dev.parent); |
823d494a | 1838 | spin_lock_irq(sch->lock); |
0d01bb89 | 1839 | if (cio_is_console(sch->schid)) |
823d494a | 1840 | goto out_restore; |
0d01bb89 | 1841 | |
823d494a SO |
1842 | /* check recognition results */ |
1843 | switch (cdev->private->state) { | |
1844 | case DEV_STATE_OFFLINE: | |
0d01bb89 SO |
1845 | case DEV_STATE_ONLINE: |
1846 | cdev->private->flags.donotify = 0; | |
823d494a SO |
1847 | break; |
1848 | case DEV_STATE_BOXED: | |
1849 | ret = resume_handle_boxed(cdev); | |
823d494a | 1850 | if (ret) |
0d01bb89 | 1851 | goto out_unlock; |
823d494a | 1852 | goto out_restore; |
823d494a | 1853 | default: |
0d01bb89 SO |
1854 | ret = resume_handle_disc(cdev); |
1855 | if (ret) | |
1856 | goto out_unlock; | |
1857 | goto out_restore; | |
823d494a SO |
1858 | } |
1859 | /* check if the device type has changed */ | |
1860 | if (!ccw_device_test_sense_data(cdev)) { | |
1861 | ccw_device_update_sense_data(cdev); | |
37de53bb | 1862 | ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); |
823d494a SO |
1863 | ret = -ENODEV; |
1864 | goto out_unlock; | |
1865 | } | |
0d01bb89 | 1866 | if (!cdev->online) |
823d494a | 1867 | goto out_unlock; |
823d494a | 1868 | |
0d01bb89 SO |
1869 | if (ccw_device_online(cdev)) { |
1870 | ret = resume_handle_disc(cdev); | |
1871 | if (ret) | |
1872 | goto out_unlock; | |
1873 | goto out_restore; | |
1874 | } | |
823d494a | 1875 | spin_unlock_irq(sch->lock); |
823d494a | 1876 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
0d01bb89 SO |
1877 | spin_lock_irq(sch->lock); |
1878 | ||
1879 | if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) { | |
1880 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1881 | ret = -ENODEV; | |
1882 | goto out_unlock; | |
823d494a | 1883 | } |
0d01bb89 SO |
1884 | |
1885 | /* reenable cmf, if needed */ | |
1886 | if (cdev->private->cmb) { | |
1887 | spin_unlock_irq(sch->lock); | |
823d494a | 1888 | ret = ccw_set_cmf(cdev, 1); |
0d01bb89 | 1889 | spin_lock_irq(sch->lock); |
823d494a | 1890 | if (ret) { |
f014824e SO |
1891 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
1892 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
1893 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
1894 | ret = 0; |
1895 | } | |
1896 | } | |
1897 | ||
1898 | out_restore: | |
0d01bb89 | 1899 | spin_unlock_irq(sch->lock); |
823d494a SO |
1900 | if (cdev->online && cdev->drv && cdev->drv->restore) |
1901 | ret = cdev->drv->restore(cdev); | |
823d494a SO |
1902 | return ret; |
1903 | ||
823d494a SO |
1904 | out_unlock: |
1905 | spin_unlock_irq(sch->lock); | |
1906 | return ret; | |
1907 | } | |
1908 | ||
47145210 | 1909 | static const struct dev_pm_ops ccw_pm_ops = { |
823d494a SO |
1910 | .prepare = ccw_device_pm_prepare, |
1911 | .complete = ccw_device_pm_complete, | |
1912 | .freeze = ccw_device_pm_freeze, | |
1913 | .thaw = ccw_device_pm_thaw, | |
1914 | .restore = ccw_device_pm_restore, | |
1915 | }; | |
1916 | ||
8bbace7e CH |
1917 | struct bus_type ccw_bus_type = { |
1918 | .name = "ccw", | |
1919 | .match = ccw_bus_match, | |
1920 | .uevent = ccw_uevent, | |
1921 | .probe = ccw_device_probe, | |
1922 | .remove = ccw_device_remove, | |
958974fb | 1923 | .shutdown = ccw_device_shutdown, |
823d494a | 1924 | .pm = &ccw_pm_ops, |
8bbace7e CH |
1925 | }; |
1926 | ||
b2ffd8e9 CH |
1927 | /** |
1928 | * ccw_driver_register() - register a ccw driver | |
1929 | * @cdriver: driver to be registered | |
1930 | * | |
1931 | * This function is mainly a wrapper around driver_register(). | |
1932 | * Returns: | |
1933 | * %0 on success and a negative error value on failure. | |
1934 | */ | |
1935 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
1936 | { |
1937 | struct device_driver *drv = &cdriver->driver; | |
1938 | ||
1939 | drv->bus = &ccw_bus_type; | |
1940 | drv->name = cdriver->name; | |
4beee646 | 1941 | drv->owner = cdriver->owner; |
1da177e4 LT |
1942 | |
1943 | return driver_register(drv); | |
1944 | } | |
1945 | ||
b2ffd8e9 CH |
1946 | /** |
1947 | * ccw_driver_unregister() - deregister a ccw driver | |
1948 | * @cdriver: driver to be deregistered | |
1949 | * | |
1950 | * This function is mainly a wrapper around driver_unregister(). | |
1951 | */ | |
1952 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
1953 | { |
1954 | driver_unregister(&cdriver->driver); | |
1955 | } | |
1956 | ||
a8237fc4 CH |
1957 | /* Helper func for qdio. */ |
1958 | struct subchannel_id | |
1959 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1960 | { | |
1961 | struct subchannel *sch; | |
1962 | ||
1963 | sch = to_subchannel(cdev->dev.parent); | |
1964 | return sch->schid; | |
1965 | } | |
1966 | ||
37de53bb PO |
1967 | static void ccw_device_todo(struct work_struct *work) |
1968 | { | |
1969 | struct ccw_device_private *priv; | |
1970 | struct ccw_device *cdev; | |
1971 | struct subchannel *sch; | |
1972 | enum cdev_todo todo; | |
1973 | ||
1974 | priv = container_of(work, struct ccw_device_private, todo_work); | |
1975 | cdev = priv->cdev; | |
1976 | sch = to_subchannel(cdev->dev.parent); | |
1977 | /* Find out todo. */ | |
1978 | spin_lock_irq(cdev->ccwlock); | |
1979 | todo = priv->todo; | |
1980 | priv->todo = CDEV_TODO_NOTHING; | |
1981 | CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n", | |
1982 | priv->dev_id.ssid, priv->dev_id.devno, todo); | |
1983 | spin_unlock_irq(cdev->ccwlock); | |
1984 | /* Perform todo. */ | |
1985 | switch (todo) { | |
1986 | case CDEV_TODO_ENABLE_CMF: | |
1987 | cmf_reenable(cdev); | |
1988 | break; | |
1989 | case CDEV_TODO_REBIND: | |
1990 | ccw_device_do_unbind_bind(cdev); | |
1991 | break; | |
1992 | case CDEV_TODO_REGISTER: | |
1993 | io_subchannel_register(cdev); | |
1994 | break; | |
1995 | case CDEV_TODO_UNREG_EVAL: | |
1996 | if (!sch_is_pseudo_sch(sch)) | |
1997 | css_schedule_eval(sch->schid); | |
1998 | /* fall-through */ | |
1999 | case CDEV_TODO_UNREG: | |
2000 | if (sch_is_pseudo_sch(sch)) | |
2001 | ccw_device_unregister(cdev); | |
2002 | else | |
2003 | ccw_device_call_sch_unregister(cdev); | |
2004 | break; | |
2005 | default: | |
2006 | break; | |
2007 | } | |
2008 | /* Release workqueue ref. */ | |
2009 | put_device(&cdev->dev); | |
2010 | } | |
2011 | ||
2012 | /** | |
2013 | * ccw_device_sched_todo - schedule ccw device operation | |
2014 | * @cdev: ccw device | |
2015 | * @todo: todo | |
2016 | * | |
2017 | * Schedule the operation identified by @todo to be performed on the slow path | |
2018 | * workqueue. Do nothing if another operation with higher priority is already | |
2019 | * scheduled. Needs to be called with ccwdev lock held. | |
2020 | */ | |
2021 | void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo) | |
2022 | { | |
2023 | CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n", | |
2024 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
2025 | todo); | |
2026 | if (cdev->private->todo >= todo) | |
2027 | return; | |
2028 | cdev->private->todo = todo; | |
2029 | /* Get workqueue ref. */ | |
2030 | if (!get_device(&cdev->dev)) | |
2031 | return; | |
be5d3823 | 2032 | if (!queue_work(cio_work_q, &cdev->private->todo_work)) { |
37de53bb PO |
2033 | /* Already queued, release workqueue ref. */ |
2034 | put_device(&cdev->dev); | |
2035 | } | |
2036 | } | |
2037 | ||
1da177e4 LT |
2038 | MODULE_LICENSE("GPL"); |
2039 | EXPORT_SYMBOL(ccw_device_set_online); | |
2040 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2041 | EXPORT_SYMBOL(ccw_driver_register); | |
2042 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2043 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
2044 | EXPORT_SYMBOL(ccw_bus_type); | |
a8237fc4 | 2045 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |