Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/css.c | |
3 | * driver for channel subsystem | |
1da177e4 LT |
4 | * |
5 | * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, | |
6 | * IBM Corporation | |
7 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) | |
4ce3b30c | 8 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
9 | */ |
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/list.h> | |
16 | ||
17 | #include "css.h" | |
18 | #include "cio.h" | |
19 | #include "cio_debug.h" | |
20 | #include "ioasm.h" | |
21 | #include "chsc.h" | |
40154b82 | 22 | #include "device.h" |
1da177e4 | 23 | |
1da177e4 LT |
24 | int need_rescan = 0; |
25 | int css_init_done = 0; | |
40154b82 | 26 | static int need_reprobe = 0; |
fb6958a5 | 27 | static int max_ssid = 0; |
1da177e4 | 28 | |
a28c6944 | 29 | struct channel_subsystem *css[__MAX_CSSID + 1]; |
1da177e4 | 30 | |
a28c6944 | 31 | int css_characteristics_avail = 0; |
1da177e4 | 32 | |
f97a56fb CH |
33 | inline int |
34 | for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data) | |
35 | { | |
36 | struct subchannel_id schid; | |
37 | int ret; | |
38 | ||
39 | init_subchannel_id(&schid); | |
40 | ret = -ENODEV; | |
41 | do { | |
fb6958a5 CH |
42 | do { |
43 | ret = fn(schid, data); | |
44 | if (ret) | |
45 | break; | |
46 | } while (schid.sch_no++ < __MAX_SUBCHANNEL); | |
47 | schid.sch_no = 0; | |
48 | } while (schid.ssid++ < max_ssid); | |
f97a56fb CH |
49 | return ret; |
50 | } | |
51 | ||
1da177e4 | 52 | static struct subchannel * |
a8237fc4 | 53 | css_alloc_subchannel(struct subchannel_id schid) |
1da177e4 LT |
54 | { |
55 | struct subchannel *sch; | |
56 | int ret; | |
57 | ||
58 | sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA); | |
59 | if (sch == NULL) | |
60 | return ERR_PTR(-ENOMEM); | |
a8237fc4 | 61 | ret = cio_validate_subchannel (sch, schid); |
1da177e4 LT |
62 | if (ret < 0) { |
63 | kfree(sch); | |
64 | return ERR_PTR(ret); | |
65 | } | |
1da177e4 LT |
66 | |
67 | if (sch->st != SUBCHANNEL_TYPE_IO) { | |
68 | /* For now we ignore all non-io subchannels. */ | |
69 | kfree(sch); | |
70 | return ERR_PTR(-EINVAL); | |
71 | } | |
72 | ||
73 | /* | |
74 | * Set intparm to subchannel address. | |
75 | * This is fine even on 64bit since the subchannel is always located | |
76 | * under 2G. | |
77 | */ | |
78 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; | |
79 | ret = cio_modify(sch); | |
80 | if (ret) { | |
81 | kfree(sch); | |
82 | return ERR_PTR(ret); | |
83 | } | |
84 | return sch; | |
85 | } | |
86 | ||
87 | static void | |
88 | css_free_subchannel(struct subchannel *sch) | |
89 | { | |
90 | if (sch) { | |
91 | /* Reset intparm to zeroes. */ | |
92 | sch->schib.pmcw.intparm = 0; | |
93 | cio_modify(sch); | |
2ec22984 | 94 | kfree(sch->lock); |
1da177e4 LT |
95 | kfree(sch); |
96 | } | |
1da177e4 LT |
97 | } |
98 | ||
99 | static void | |
100 | css_subchannel_release(struct device *dev) | |
101 | { | |
102 | struct subchannel *sch; | |
103 | ||
104 | sch = to_subchannel(dev); | |
2ec22984 CH |
105 | if (!cio_is_console(sch->schid)) { |
106 | kfree(sch->lock); | |
1da177e4 | 107 | kfree(sch); |
2ec22984 | 108 | } |
1da177e4 LT |
109 | } |
110 | ||
6ab4879a CH |
111 | int css_sch_device_register(struct subchannel *sch) |
112 | { | |
113 | int ret; | |
114 | ||
115 | mutex_lock(&sch->reg_mutex); | |
116 | ret = device_register(&sch->dev); | |
117 | mutex_unlock(&sch->reg_mutex); | |
118 | return ret; | |
119 | } | |
120 | ||
121 | void css_sch_device_unregister(struct subchannel *sch) | |
122 | { | |
123 | mutex_lock(&sch->reg_mutex); | |
124 | device_unregister(&sch->dev); | |
125 | mutex_unlock(&sch->reg_mutex); | |
126 | } | |
127 | ||
1da177e4 LT |
128 | static int |
129 | css_register_subchannel(struct subchannel *sch) | |
130 | { | |
131 | int ret; | |
132 | ||
133 | /* Initialize the subchannel structure */ | |
a28c6944 | 134 | sch->dev.parent = &css[0]->device; |
1da177e4 LT |
135 | sch->dev.bus = &css_bus_type; |
136 | sch->dev.release = &css_subchannel_release; | |
529192f3 | 137 | sch->dev.groups = subch_attr_groups; |
7674da77 | 138 | |
e42734e2 SB |
139 | css_get_ssd_info(sch); |
140 | ||
1da177e4 | 141 | /* make it known to the system */ |
6ab4879a | 142 | ret = css_sch_device_register(sch); |
7674da77 | 143 | if (ret) { |
1da177e4 LT |
144 | printk (KERN_WARNING "%s: could not register %s\n", |
145 | __func__, sch->dev.bus_id); | |
7674da77 CH |
146 | return ret; |
147 | } | |
1da177e4 LT |
148 | return ret; |
149 | } | |
150 | ||
151 | int | |
a8237fc4 | 152 | css_probe_device(struct subchannel_id schid) |
1da177e4 LT |
153 | { |
154 | int ret; | |
155 | struct subchannel *sch; | |
156 | ||
a8237fc4 | 157 | sch = css_alloc_subchannel(schid); |
1da177e4 LT |
158 | if (IS_ERR(sch)) |
159 | return PTR_ERR(sch); | |
160 | ret = css_register_subchannel(sch); | |
161 | if (ret) | |
162 | css_free_subchannel(sch); | |
163 | return ret; | |
164 | } | |
165 | ||
b0744bd2 CH |
166 | static int |
167 | check_subchannel(struct device * dev, void * data) | |
168 | { | |
169 | struct subchannel *sch; | |
a8237fc4 | 170 | struct subchannel_id *schid = data; |
b0744bd2 CH |
171 | |
172 | sch = to_subchannel(dev); | |
a8237fc4 | 173 | return schid_equal(&sch->schid, schid); |
b0744bd2 CH |
174 | } |
175 | ||
1da177e4 | 176 | struct subchannel * |
a8237fc4 | 177 | get_subchannel_by_schid(struct subchannel_id schid) |
1da177e4 | 178 | { |
1da177e4 LT |
179 | struct device *dev; |
180 | ||
b0744bd2 | 181 | dev = bus_find_device(&css_bus_type, NULL, |
12975aef | 182 | &schid, check_subchannel); |
1da177e4 | 183 | |
b0744bd2 | 184 | return dev ? to_subchannel(dev) : NULL; |
1da177e4 LT |
185 | } |
186 | ||
564337f3 | 187 | static inline int css_get_subchannel_status(struct subchannel *sch) |
1da177e4 LT |
188 | { |
189 | struct schib schib; | |
1da177e4 | 190 | |
564337f3 | 191 | if (stsch(sch->schid, &schib) || !schib.pmcw.dnv) |
1da177e4 | 192 | return CIO_GONE; |
564337f3 | 193 | if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev)) |
1da177e4 | 194 | return CIO_REVALIDATE; |
564337f3 | 195 | if (!sch->lpm) |
1da177e4 LT |
196 | return CIO_NO_PATH; |
197 | return CIO_OPER; | |
198 | } | |
564337f3 PO |
199 | |
200 | static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) | |
1da177e4 LT |
201 | { |
202 | int event, ret, disc; | |
1da177e4 | 203 | unsigned long flags; |
564337f3 | 204 | enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE } action; |
1da177e4 | 205 | |
2ec22984 | 206 | spin_lock_irqsave(sch->lock, flags); |
564337f3 | 207 | disc = device_is_disconnected(sch); |
1da177e4 | 208 | if (disc && slow) { |
564337f3 | 209 | /* Disconnected devices are evaluated directly only.*/ |
2ec22984 | 210 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 211 | return 0; |
1da177e4 | 212 | } |
564337f3 PO |
213 | /* No interrupt after machine check - kill pending timers. */ |
214 | device_kill_pending_timer(sch); | |
1da177e4 | 215 | if (!disc && !slow) { |
564337f3 | 216 | /* Non-disconnected devices are evaluated on the slow path. */ |
2ec22984 | 217 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 218 | return -EAGAIN; |
1da177e4 | 219 | } |
564337f3 | 220 | event = css_get_subchannel_status(sch); |
fb6958a5 | 221 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n", |
564337f3 PO |
222 | sch->schid.ssid, sch->schid.sch_no, event, |
223 | disc ? "disconnected" : "normal", | |
224 | slow ? "slow" : "fast"); | |
225 | /* Analyze subchannel status. */ | |
226 | action = NONE; | |
1da177e4 LT |
227 | switch (event) { |
228 | case CIO_NO_PATH: | |
564337f3 PO |
229 | if (disc) { |
230 | /* Check if paths have become available. */ | |
231 | action = REPROBE; | |
1da177e4 LT |
232 | break; |
233 | } | |
564337f3 PO |
234 | /* fall through */ |
235 | case CIO_GONE: | |
236 | /* Prevent unwanted effects when opening lock. */ | |
237 | cio_disable_subchannel(sch); | |
238 | device_set_disconnected(sch); | |
239 | /* Ask driver what to do with device. */ | |
240 | action = UNREGISTER; | |
241 | if (sch->driver && sch->driver->notify) { | |
2ec22984 | 242 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 243 | ret = sch->driver->notify(&sch->dev, event); |
2ec22984 | 244 | spin_lock_irqsave(sch->lock, flags); |
564337f3 PO |
245 | if (ret) |
246 | action = NONE; | |
1da177e4 | 247 | } |
1da177e4 LT |
248 | break; |
249 | case CIO_REVALIDATE: | |
564337f3 PO |
250 | /* Device will be removed, so no notify necessary. */ |
251 | if (disc) | |
252 | /* Reprobe because immediate unregister might block. */ | |
253 | action = REPROBE; | |
254 | else | |
255 | action = UNREGISTER_PROBE; | |
1da177e4 LT |
256 | break; |
257 | case CIO_OPER: | |
564337f3 | 258 | if (disc) |
1da177e4 | 259 | /* Get device operational again. */ |
564337f3 PO |
260 | action = REPROBE; |
261 | break; | |
262 | } | |
263 | /* Perform action. */ | |
264 | ret = 0; | |
265 | switch (action) { | |
266 | case UNREGISTER: | |
267 | case UNREGISTER_PROBE: | |
268 | /* Unregister device (will use subchannel lock). */ | |
2ec22984 | 269 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 270 | css_sch_device_unregister(sch); |
2ec22984 | 271 | spin_lock_irqsave(sch->lock, flags); |
564337f3 PO |
272 | |
273 | /* Reset intparm to zeroes. */ | |
274 | sch->schib.pmcw.intparm = 0; | |
275 | cio_modify(sch); | |
564337f3 PO |
276 | break; |
277 | case REPROBE: | |
278 | device_trigger_reprobe(sch); | |
1da177e4 LT |
279 | break; |
280 | default: | |
564337f3 PO |
281 | break; |
282 | } | |
2ec22984 | 283 | spin_unlock_irqrestore(sch->lock, flags); |
c2b1449b CH |
284 | /* Probe if necessary. */ |
285 | if (action == UNREGISTER_PROBE) | |
286 | ret = css_probe_device(sch->schid); | |
564337f3 PO |
287 | |
288 | return ret; | |
289 | } | |
290 | ||
291 | static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) | |
292 | { | |
293 | struct schib schib; | |
294 | ||
295 | if (!slow) { | |
296 | /* Will be done on the slow path. */ | |
297 | return -EAGAIN; | |
298 | } | |
758976f9 | 299 | if (stsch_err(schid, &schib) || !schib.pmcw.dnv) { |
564337f3 PO |
300 | /* Unusable - ignore. */ |
301 | return 0; | |
1da177e4 | 302 | } |
564337f3 PO |
303 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, unknown, " |
304 | "slow path.\n", schid.ssid, schid.sch_no, CIO_OPER); | |
305 | ||
306 | return css_probe_device(schid); | |
307 | } | |
308 | ||
309 | static int css_evaluate_subchannel(struct subchannel_id schid, int slow) | |
310 | { | |
311 | struct subchannel *sch; | |
312 | int ret; | |
313 | ||
314 | sch = get_subchannel_by_schid(schid); | |
315 | if (sch) { | |
316 | ret = css_evaluate_known_subchannel(sch, slow); | |
317 | put_device(&sch->dev); | |
318 | } else | |
319 | ret = css_evaluate_new_subchannel(schid, slow); | |
320 | ||
1da177e4 LT |
321 | return ret; |
322 | } | |
323 | ||
f97a56fb CH |
324 | static int |
325 | css_rescan_devices(struct subchannel_id schid, void *data) | |
1da177e4 | 326 | { |
f97a56fb | 327 | return css_evaluate_subchannel(schid, 1); |
1da177e4 LT |
328 | } |
329 | ||
330 | struct slow_subchannel { | |
331 | struct list_head slow_list; | |
a8237fc4 | 332 | struct subchannel_id schid; |
1da177e4 LT |
333 | }; |
334 | ||
335 | static LIST_HEAD(slow_subchannels_head); | |
336 | static DEFINE_SPINLOCK(slow_subchannel_lock); | |
337 | ||
338 | static void | |
4927b3f7 | 339 | css_trigger_slow_path(struct work_struct *unused) |
1da177e4 LT |
340 | { |
341 | CIO_TRACE_EVENT(4, "slowpath"); | |
342 | ||
343 | if (need_rescan) { | |
344 | need_rescan = 0; | |
f97a56fb | 345 | for_each_subchannel(css_rescan_devices, NULL); |
1da177e4 LT |
346 | return; |
347 | } | |
348 | ||
349 | spin_lock_irq(&slow_subchannel_lock); | |
350 | while (!list_empty(&slow_subchannels_head)) { | |
351 | struct slow_subchannel *slow_sch = | |
352 | list_entry(slow_subchannels_head.next, | |
353 | struct slow_subchannel, slow_list); | |
354 | ||
355 | list_del_init(slow_subchannels_head.next); | |
356 | spin_unlock_irq(&slow_subchannel_lock); | |
357 | css_evaluate_subchannel(slow_sch->schid, 1); | |
358 | spin_lock_irq(&slow_subchannel_lock); | |
359 | kfree(slow_sch); | |
360 | } | |
361 | spin_unlock_irq(&slow_subchannel_lock); | |
362 | } | |
363 | ||
4927b3f7 | 364 | DECLARE_WORK(slow_path_work, css_trigger_slow_path); |
1da177e4 LT |
365 | struct workqueue_struct *slow_path_wq; |
366 | ||
40154b82 PO |
367 | /* Reprobe subchannel if unregistered. */ |
368 | static int reprobe_subchannel(struct subchannel_id schid, void *data) | |
369 | { | |
370 | struct subchannel *sch; | |
371 | int ret; | |
372 | ||
373 | CIO_DEBUG(KERN_INFO, 6, "cio: reprobe 0.%x.%04x\n", | |
374 | schid.ssid, schid.sch_no); | |
375 | if (need_reprobe) | |
376 | return -EAGAIN; | |
377 | ||
378 | sch = get_subchannel_by_schid(schid); | |
379 | if (sch) { | |
380 | /* Already known. */ | |
381 | put_device(&sch->dev); | |
382 | return 0; | |
383 | } | |
384 | ||
385 | ret = css_probe_device(schid); | |
386 | switch (ret) { | |
387 | case 0: | |
388 | break; | |
389 | case -ENXIO: | |
390 | case -ENOMEM: | |
391 | /* These should abort looping */ | |
392 | break; | |
393 | default: | |
394 | ret = 0; | |
395 | } | |
396 | ||
397 | return ret; | |
398 | } | |
399 | ||
400 | /* Work function used to reprobe all unregistered subchannels. */ | |
4927b3f7 | 401 | static void reprobe_all(struct work_struct *unused) |
40154b82 PO |
402 | { |
403 | int ret; | |
404 | ||
405 | CIO_MSG_EVENT(2, "reprobe start\n"); | |
406 | ||
407 | need_reprobe = 0; | |
408 | /* Make sure initial subchannel scan is done. */ | |
409 | wait_event(ccw_device_init_wq, | |
410 | atomic_read(&ccw_device_init_count) == 0); | |
411 | ret = for_each_subchannel(reprobe_subchannel, NULL); | |
412 | ||
413 | CIO_MSG_EVENT(2, "reprobe done (rc=%d, need_reprobe=%d)\n", ret, | |
414 | need_reprobe); | |
415 | } | |
416 | ||
2b67fc46 | 417 | static DECLARE_WORK(css_reprobe_work, reprobe_all); |
40154b82 PO |
418 | |
419 | /* Schedule reprobing of all unregistered subchannels. */ | |
420 | void css_schedule_reprobe(void) | |
421 | { | |
422 | need_reprobe = 1; | |
423 | queue_work(ccw_device_work, &css_reprobe_work); | |
424 | } | |
425 | ||
426 | EXPORT_SYMBOL_GPL(css_schedule_reprobe); | |
427 | ||
1da177e4 LT |
428 | /* |
429 | * Rescan for new devices. FIXME: This is slow. | |
430 | * This function is called when we have lost CRWs due to overflows and we have | |
431 | * to do subchannel housekeeping. | |
432 | */ | |
433 | void | |
434 | css_reiterate_subchannels(void) | |
435 | { | |
436 | css_clear_subchannel_slow_list(); | |
437 | need_rescan = 1; | |
438 | } | |
439 | ||
440 | /* | |
441 | * Called from the machine check handler for subchannel report words. | |
442 | */ | |
443 | int | |
fb6958a5 | 444 | css_process_crw(int rsid1, int rsid2) |
1da177e4 LT |
445 | { |
446 | int ret; | |
a8237fc4 | 447 | struct subchannel_id mchk_schid; |
1da177e4 | 448 | |
fb6958a5 CH |
449 | CIO_CRW_EVENT(2, "source is subchannel %04X, subsystem id %x\n", |
450 | rsid1, rsid2); | |
1da177e4 LT |
451 | |
452 | if (need_rescan) | |
453 | /* We need to iterate all subchannels anyway. */ | |
454 | return -EAGAIN; | |
a8237fc4 CH |
455 | |
456 | init_subchannel_id(&mchk_schid); | |
fb6958a5 CH |
457 | mchk_schid.sch_no = rsid1; |
458 | if (rsid2 != 0) | |
459 | mchk_schid.ssid = (rsid2 >> 8) & 3; | |
460 | ||
1da177e4 LT |
461 | /* |
462 | * Since we are always presented with IPI in the CRW, we have to | |
463 | * use stsch() to find out if the subchannel in question has come | |
464 | * or gone. | |
465 | */ | |
a8237fc4 | 466 | ret = css_evaluate_subchannel(mchk_schid, 0); |
1da177e4 | 467 | if (ret == -EAGAIN) { |
a8237fc4 | 468 | if (css_enqueue_subchannel_slow(mchk_schid)) { |
1da177e4 LT |
469 | css_clear_subchannel_slow_list(); |
470 | need_rescan = 1; | |
471 | } | |
472 | } | |
473 | return ret; | |
474 | } | |
475 | ||
f97a56fb CH |
476 | static int __init |
477 | __init_channel_subsystem(struct subchannel_id schid, void *data) | |
478 | { | |
479 | struct subchannel *sch; | |
480 | int ret; | |
481 | ||
482 | if (cio_is_console(schid)) | |
483 | sch = cio_get_console_subchannel(); | |
484 | else { | |
485 | sch = css_alloc_subchannel(schid); | |
486 | if (IS_ERR(sch)) | |
487 | ret = PTR_ERR(sch); | |
488 | else | |
489 | ret = 0; | |
490 | switch (ret) { | |
491 | case 0: | |
492 | break; | |
493 | case -ENOMEM: | |
494 | panic("Out of memory in init_channel_subsystem\n"); | |
495 | /* -ENXIO: no more subchannels. */ | |
496 | case -ENXIO: | |
497 | return ret; | |
e843e280 GS |
498 | /* -EIO: this subchannel set not supported. */ |
499 | case -EIO: | |
500 | return ret; | |
f97a56fb CH |
501 | default: |
502 | return 0; | |
503 | } | |
504 | } | |
505 | /* | |
506 | * We register ALL valid subchannels in ioinfo, even those | |
507 | * that have been present before init_channel_subsystem. | |
508 | * These subchannels can't have been registered yet (kmalloc | |
509 | * not working) so we do it now. This is true e.g. for the | |
510 | * console subchannel. | |
511 | */ | |
512 | css_register_subchannel(sch); | |
513 | return 0; | |
514 | } | |
515 | ||
1da177e4 | 516 | static void __init |
a28c6944 | 517 | css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
1da177e4 | 518 | { |
a28c6944 CH |
519 | if (css_characteristics_avail && css_general_characteristics.mcss) { |
520 | css->global_pgid.pgid_high.ext_cssid.version = 0x80; | |
521 | css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; | |
522 | } else { | |
1da177e4 | 523 | #ifdef CONFIG_SMP |
a28c6944 | 524 | css->global_pgid.pgid_high.cpu_addr = hard_smp_processor_id(); |
1da177e4 | 525 | #else |
a28c6944 | 526 | css->global_pgid.pgid_high.cpu_addr = 0; |
1da177e4 LT |
527 | #endif |
528 | } | |
a28c6944 CH |
529 | css->global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident; |
530 | css->global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine; | |
531 | css->global_pgid.tod_high = tod_high; | |
532 | ||
533 | } | |
534 | ||
3b793060 CH |
535 | static void |
536 | channel_subsystem_release(struct device *dev) | |
537 | { | |
538 | struct channel_subsystem *css; | |
539 | ||
540 | css = to_css(dev); | |
495a5b45 | 541 | mutex_destroy(&css->mutex); |
3b793060 CH |
542 | kfree(css); |
543 | } | |
544 | ||
495a5b45 CH |
545 | static ssize_t |
546 | css_cm_enable_show(struct device *dev, struct device_attribute *attr, | |
547 | char *buf) | |
548 | { | |
549 | struct channel_subsystem *css = to_css(dev); | |
550 | ||
551 | if (!css) | |
552 | return 0; | |
553 | return sprintf(buf, "%x\n", css->cm_enabled); | |
554 | } | |
555 | ||
556 | static ssize_t | |
557 | css_cm_enable_store(struct device *dev, struct device_attribute *attr, | |
558 | const char *buf, size_t count) | |
559 | { | |
560 | struct channel_subsystem *css = to_css(dev); | |
561 | int ret; | |
562 | ||
563 | switch (buf[0]) { | |
564 | case '0': | |
565 | ret = css->cm_enabled ? chsc_secm(css, 0) : 0; | |
566 | break; | |
567 | case '1': | |
568 | ret = css->cm_enabled ? 0 : chsc_secm(css, 1); | |
569 | break; | |
570 | default: | |
571 | ret = -EINVAL; | |
572 | } | |
573 | return ret < 0 ? ret : count; | |
574 | } | |
575 | ||
576 | static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); | |
577 | ||
d7b5a4c9 | 578 | static inline int __init setup_css(int nr) |
a28c6944 CH |
579 | { |
580 | u32 tod_high; | |
d7b5a4c9 | 581 | int ret; |
a28c6944 CH |
582 | |
583 | memset(css[nr], 0, sizeof(struct channel_subsystem)); | |
d7b5a4c9 CH |
584 | css[nr]->pseudo_subchannel = |
585 | kzalloc(sizeof(*css[nr]->pseudo_subchannel), GFP_KERNEL); | |
586 | if (!css[nr]->pseudo_subchannel) | |
587 | return -ENOMEM; | |
588 | css[nr]->pseudo_subchannel->dev.parent = &css[nr]->device; | |
589 | css[nr]->pseudo_subchannel->dev.release = css_subchannel_release; | |
590 | sprintf(css[nr]->pseudo_subchannel->dev.bus_id, "defunct"); | |
591 | ret = cio_create_sch_lock(css[nr]->pseudo_subchannel); | |
592 | if (ret) { | |
593 | kfree(css[nr]->pseudo_subchannel); | |
594 | return ret; | |
595 | } | |
495a5b45 | 596 | mutex_init(&css[nr]->mutex); |
a28c6944 CH |
597 | css[nr]->valid = 1; |
598 | css[nr]->cssid = nr; | |
599 | sprintf(css[nr]->device.bus_id, "css%x", nr); | |
3b793060 | 600 | css[nr]->device.release = channel_subsystem_release; |
a28c6944 CH |
601 | tod_high = (u32) (get_clock() >> 32); |
602 | css_generate_pgid(css[nr], tod_high); | |
d7b5a4c9 | 603 | return 0; |
1da177e4 LT |
604 | } |
605 | ||
606 | /* | |
607 | * Now that the driver core is running, we can setup our channel subsystem. | |
608 | * The struct subchannel's are created during probing (except for the | |
609 | * static console subchannel). | |
610 | */ | |
611 | static int __init | |
612 | init_channel_subsystem (void) | |
613 | { | |
a28c6944 | 614 | int ret, i; |
1da177e4 LT |
615 | |
616 | if (chsc_determine_css_characteristics() == 0) | |
617 | css_characteristics_avail = 1; | |
618 | ||
1da177e4 LT |
619 | if ((ret = bus_register(&css_bus_type))) |
620 | goto out; | |
1da177e4 | 621 | |
fb6958a5 CH |
622 | /* Try to enable MSS. */ |
623 | ret = chsc_enable_facility(CHSC_SDA_OC_MSS); | |
624 | switch (ret) { | |
625 | case 0: /* Success. */ | |
626 | max_ssid = __MAX_SSID; | |
627 | break; | |
628 | case -ENOMEM: | |
629 | goto out_bus; | |
630 | default: | |
631 | max_ssid = 0; | |
632 | } | |
a28c6944 CH |
633 | /* Setup css structure. */ |
634 | for (i = 0; i <= __MAX_CSSID; i++) { | |
635 | css[i] = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL); | |
636 | if (!css[i]) { | |
637 | ret = -ENOMEM; | |
fb6958a5 | 638 | goto out_unregister; |
a28c6944 | 639 | } |
d7b5a4c9 | 640 | ret = setup_css(i); |
a28c6944 CH |
641 | if (ret) |
642 | goto out_free; | |
d7b5a4c9 CH |
643 | ret = device_register(&css[i]->device); |
644 | if (ret) | |
645 | goto out_free_all; | |
7e560814 CH |
646 | if (css_characteristics_avail && |
647 | css_chsc_characteristics.secm) { | |
648 | ret = device_create_file(&css[i]->device, | |
649 | &dev_attr_cm_enable); | |
650 | if (ret) | |
651 | goto out_device; | |
652 | } | |
d7b5a4c9 CH |
653 | ret = device_register(&css[i]->pseudo_subchannel->dev); |
654 | if (ret) | |
655 | goto out_file; | |
a28c6944 | 656 | } |
1da177e4 LT |
657 | css_init_done = 1; |
658 | ||
659 | ctl_set_bit(6, 28); | |
660 | ||
f97a56fb | 661 | for_each_subchannel(__init_channel_subsystem, NULL); |
1da177e4 | 662 | return 0; |
d7b5a4c9 CH |
663 | out_file: |
664 | device_remove_file(&css[i]->device, &dev_attr_cm_enable); | |
7e560814 CH |
665 | out_device: |
666 | device_unregister(&css[i]->device); | |
d7b5a4c9 CH |
667 | out_free_all: |
668 | kfree(css[i]->pseudo_subchannel->lock); | |
669 | kfree(css[i]->pseudo_subchannel); | |
a28c6944 CH |
670 | out_free: |
671 | kfree(css[i]); | |
fb6958a5 | 672 | out_unregister: |
a28c6944 CH |
673 | while (i > 0) { |
674 | i--; | |
d7b5a4c9 | 675 | device_unregister(&css[i]->pseudo_subchannel->dev); |
495a5b45 CH |
676 | if (css_characteristics_avail && css_chsc_characteristics.secm) |
677 | device_remove_file(&css[i]->device, | |
678 | &dev_attr_cm_enable); | |
a28c6944 CH |
679 | device_unregister(&css[i]->device); |
680 | } | |
fb6958a5 | 681 | out_bus: |
1da177e4 LT |
682 | bus_unregister(&css_bus_type); |
683 | out: | |
684 | return ret; | |
685 | } | |
686 | ||
d7b5a4c9 CH |
687 | int sch_is_pseudo_sch(struct subchannel *sch) |
688 | { | |
689 | return sch == to_css(sch->dev.parent)->pseudo_subchannel; | |
690 | } | |
691 | ||
1da177e4 LT |
692 | /* |
693 | * find a driver for a subchannel. They identify by the subchannel | |
694 | * type with the exception that the console subchannel driver has its own | |
695 | * subchannel type although the device is an i/o subchannel | |
696 | */ | |
697 | static int | |
698 | css_bus_match (struct device *dev, struct device_driver *drv) | |
699 | { | |
700 | struct subchannel *sch = container_of (dev, struct subchannel, dev); | |
701 | struct css_driver *driver = container_of (drv, struct css_driver, drv); | |
702 | ||
703 | if (sch->st == driver->subchannel_type) | |
704 | return 1; | |
705 | ||
706 | return 0; | |
707 | } | |
708 | ||
8bbace7e CH |
709 | static int |
710 | css_probe (struct device *dev) | |
711 | { | |
712 | struct subchannel *sch; | |
713 | ||
714 | sch = to_subchannel(dev); | |
715 | sch->driver = container_of (dev->driver, struct css_driver, drv); | |
716 | return (sch->driver->probe ? sch->driver->probe(sch) : 0); | |
717 | } | |
718 | ||
719 | static int | |
720 | css_remove (struct device *dev) | |
721 | { | |
722 | struct subchannel *sch; | |
723 | ||
724 | sch = to_subchannel(dev); | |
725 | return (sch->driver->remove ? sch->driver->remove(sch) : 0); | |
726 | } | |
727 | ||
728 | static void | |
729 | css_shutdown (struct device *dev) | |
730 | { | |
731 | struct subchannel *sch; | |
732 | ||
733 | sch = to_subchannel(dev); | |
734 | if (sch->driver->shutdown) | |
735 | sch->driver->shutdown(sch); | |
736 | } | |
737 | ||
1da177e4 | 738 | struct bus_type css_bus_type = { |
8bbace7e CH |
739 | .name = "css", |
740 | .match = css_bus_match, | |
741 | .probe = css_probe, | |
742 | .remove = css_remove, | |
743 | .shutdown = css_shutdown, | |
1da177e4 LT |
744 | }; |
745 | ||
746 | subsys_initcall(init_channel_subsystem); | |
747 | ||
1da177e4 | 748 | int |
a8237fc4 | 749 | css_enqueue_subchannel_slow(struct subchannel_id schid) |
1da177e4 LT |
750 | { |
751 | struct slow_subchannel *new_slow_sch; | |
752 | unsigned long flags; | |
753 | ||
88abaab4 | 754 | new_slow_sch = kzalloc(sizeof(struct slow_subchannel), GFP_ATOMIC); |
1da177e4 LT |
755 | if (!new_slow_sch) |
756 | return -ENOMEM; | |
1da177e4 LT |
757 | new_slow_sch->schid = schid; |
758 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
759 | list_add_tail(&new_slow_sch->slow_list, &slow_subchannels_head); | |
760 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
761 | return 0; | |
762 | } | |
763 | ||
764 | void | |
765 | css_clear_subchannel_slow_list(void) | |
766 | { | |
767 | unsigned long flags; | |
768 | ||
769 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
770 | while (!list_empty(&slow_subchannels_head)) { | |
771 | struct slow_subchannel *slow_sch = | |
772 | list_entry(slow_subchannels_head.next, | |
773 | struct slow_subchannel, slow_list); | |
774 | ||
775 | list_del_init(slow_subchannels_head.next); | |
776 | kfree(slow_sch); | |
777 | } | |
778 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
779 | } | |
780 | ||
781 | ||
782 | ||
783 | int | |
784 | css_slow_subchannels_exist(void) | |
785 | { | |
786 | return (!list_empty(&slow_subchannels_head)); | |
787 | } | |
788 | ||
789 | MODULE_LICENSE("GPL"); | |
790 | EXPORT_SYMBOL(css_bus_type); | |
1da177e4 | 791 | EXPORT_SYMBOL_GPL(css_characteristics_avail); |