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 | ||
111 | extern int css_get_ssd_info(struct subchannel *sch); | |
112 | ||
6ab4879a CH |
113 | |
114 | int css_sch_device_register(struct subchannel *sch) | |
115 | { | |
116 | int ret; | |
117 | ||
118 | mutex_lock(&sch->reg_mutex); | |
119 | ret = device_register(&sch->dev); | |
120 | mutex_unlock(&sch->reg_mutex); | |
121 | return ret; | |
122 | } | |
123 | ||
124 | void css_sch_device_unregister(struct subchannel *sch) | |
125 | { | |
126 | mutex_lock(&sch->reg_mutex); | |
127 | device_unregister(&sch->dev); | |
128 | mutex_unlock(&sch->reg_mutex); | |
129 | } | |
130 | ||
1da177e4 LT |
131 | static int |
132 | css_register_subchannel(struct subchannel *sch) | |
133 | { | |
134 | int ret; | |
135 | ||
136 | /* Initialize the subchannel structure */ | |
a28c6944 | 137 | sch->dev.parent = &css[0]->device; |
1da177e4 LT |
138 | sch->dev.bus = &css_bus_type; |
139 | sch->dev.release = &css_subchannel_release; | |
529192f3 | 140 | sch->dev.groups = subch_attr_groups; |
7674da77 | 141 | |
e42734e2 SB |
142 | css_get_ssd_info(sch); |
143 | ||
1da177e4 | 144 | /* make it known to the system */ |
6ab4879a | 145 | ret = css_sch_device_register(sch); |
7674da77 | 146 | if (ret) { |
1da177e4 LT |
147 | printk (KERN_WARNING "%s: could not register %s\n", |
148 | __func__, sch->dev.bus_id); | |
7674da77 CH |
149 | return ret; |
150 | } | |
1da177e4 LT |
151 | return ret; |
152 | } | |
153 | ||
154 | int | |
a8237fc4 | 155 | css_probe_device(struct subchannel_id schid) |
1da177e4 LT |
156 | { |
157 | int ret; | |
158 | struct subchannel *sch; | |
159 | ||
a8237fc4 | 160 | sch = css_alloc_subchannel(schid); |
1da177e4 LT |
161 | if (IS_ERR(sch)) |
162 | return PTR_ERR(sch); | |
163 | ret = css_register_subchannel(sch); | |
164 | if (ret) | |
165 | css_free_subchannel(sch); | |
166 | return ret; | |
167 | } | |
168 | ||
b0744bd2 CH |
169 | static int |
170 | check_subchannel(struct device * dev, void * data) | |
171 | { | |
172 | struct subchannel *sch; | |
a8237fc4 | 173 | struct subchannel_id *schid = data; |
b0744bd2 CH |
174 | |
175 | sch = to_subchannel(dev); | |
a8237fc4 | 176 | return schid_equal(&sch->schid, schid); |
b0744bd2 CH |
177 | } |
178 | ||
1da177e4 | 179 | struct subchannel * |
a8237fc4 | 180 | get_subchannel_by_schid(struct subchannel_id schid) |
1da177e4 | 181 | { |
1da177e4 LT |
182 | struct device *dev; |
183 | ||
b0744bd2 | 184 | dev = bus_find_device(&css_bus_type, NULL, |
12975aef | 185 | &schid, check_subchannel); |
1da177e4 | 186 | |
b0744bd2 | 187 | return dev ? to_subchannel(dev) : NULL; |
1da177e4 LT |
188 | } |
189 | ||
564337f3 | 190 | static inline int css_get_subchannel_status(struct subchannel *sch) |
1da177e4 LT |
191 | { |
192 | struct schib schib; | |
1da177e4 | 193 | |
564337f3 | 194 | if (stsch(sch->schid, &schib) || !schib.pmcw.dnv) |
1da177e4 | 195 | return CIO_GONE; |
564337f3 | 196 | if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev)) |
1da177e4 | 197 | return CIO_REVALIDATE; |
564337f3 | 198 | if (!sch->lpm) |
1da177e4 LT |
199 | return CIO_NO_PATH; |
200 | return CIO_OPER; | |
201 | } | |
564337f3 PO |
202 | |
203 | static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) | |
1da177e4 LT |
204 | { |
205 | int event, ret, disc; | |
1da177e4 | 206 | unsigned long flags; |
564337f3 | 207 | enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE } action; |
1da177e4 | 208 | |
2ec22984 | 209 | spin_lock_irqsave(sch->lock, flags); |
564337f3 | 210 | disc = device_is_disconnected(sch); |
1da177e4 | 211 | if (disc && slow) { |
564337f3 | 212 | /* Disconnected devices are evaluated directly only.*/ |
2ec22984 | 213 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 214 | return 0; |
1da177e4 | 215 | } |
564337f3 PO |
216 | /* No interrupt after machine check - kill pending timers. */ |
217 | device_kill_pending_timer(sch); | |
1da177e4 | 218 | if (!disc && !slow) { |
564337f3 | 219 | /* Non-disconnected devices are evaluated on the slow path. */ |
2ec22984 | 220 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 221 | return -EAGAIN; |
1da177e4 | 222 | } |
564337f3 | 223 | event = css_get_subchannel_status(sch); |
fb6958a5 | 224 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n", |
564337f3 PO |
225 | sch->schid.ssid, sch->schid.sch_no, event, |
226 | disc ? "disconnected" : "normal", | |
227 | slow ? "slow" : "fast"); | |
228 | /* Analyze subchannel status. */ | |
229 | action = NONE; | |
1da177e4 LT |
230 | switch (event) { |
231 | case CIO_NO_PATH: | |
564337f3 PO |
232 | if (disc) { |
233 | /* Check if paths have become available. */ | |
234 | action = REPROBE; | |
1da177e4 LT |
235 | break; |
236 | } | |
564337f3 PO |
237 | /* fall through */ |
238 | case CIO_GONE: | |
239 | /* Prevent unwanted effects when opening lock. */ | |
240 | cio_disable_subchannel(sch); | |
241 | device_set_disconnected(sch); | |
242 | /* Ask driver what to do with device. */ | |
243 | action = UNREGISTER; | |
244 | if (sch->driver && sch->driver->notify) { | |
2ec22984 | 245 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 246 | ret = sch->driver->notify(&sch->dev, event); |
2ec22984 | 247 | spin_lock_irqsave(sch->lock, flags); |
564337f3 PO |
248 | if (ret) |
249 | action = NONE; | |
1da177e4 | 250 | } |
1da177e4 LT |
251 | break; |
252 | case CIO_REVALIDATE: | |
564337f3 PO |
253 | /* Device will be removed, so no notify necessary. */ |
254 | if (disc) | |
255 | /* Reprobe because immediate unregister might block. */ | |
256 | action = REPROBE; | |
257 | else | |
258 | action = UNREGISTER_PROBE; | |
1da177e4 LT |
259 | break; |
260 | case CIO_OPER: | |
564337f3 | 261 | if (disc) |
1da177e4 | 262 | /* Get device operational again. */ |
564337f3 PO |
263 | action = REPROBE; |
264 | break; | |
265 | } | |
266 | /* Perform action. */ | |
267 | ret = 0; | |
268 | switch (action) { | |
269 | case UNREGISTER: | |
270 | case UNREGISTER_PROBE: | |
271 | /* Unregister device (will use subchannel lock). */ | |
2ec22984 | 272 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 273 | css_sch_device_unregister(sch); |
2ec22984 | 274 | spin_lock_irqsave(sch->lock, flags); |
564337f3 PO |
275 | |
276 | /* Reset intparm to zeroes. */ | |
277 | sch->schib.pmcw.intparm = 0; | |
278 | cio_modify(sch); | |
564337f3 PO |
279 | break; |
280 | case REPROBE: | |
281 | device_trigger_reprobe(sch); | |
1da177e4 LT |
282 | break; |
283 | default: | |
564337f3 PO |
284 | break; |
285 | } | |
2ec22984 | 286 | spin_unlock_irqrestore(sch->lock, flags); |
c2b1449b CH |
287 | /* Probe if necessary. */ |
288 | if (action == UNREGISTER_PROBE) | |
289 | ret = css_probe_device(sch->schid); | |
564337f3 PO |
290 | |
291 | return ret; | |
292 | } | |
293 | ||
294 | static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) | |
295 | { | |
296 | struct schib schib; | |
297 | ||
298 | if (!slow) { | |
299 | /* Will be done on the slow path. */ | |
300 | return -EAGAIN; | |
301 | } | |
302 | if (stsch(schid, &schib) || !schib.pmcw.dnv) { | |
303 | /* Unusable - ignore. */ | |
304 | return 0; | |
1da177e4 | 305 | } |
564337f3 PO |
306 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, unknown, " |
307 | "slow path.\n", schid.ssid, schid.sch_no, CIO_OPER); | |
308 | ||
309 | return css_probe_device(schid); | |
310 | } | |
311 | ||
312 | static int css_evaluate_subchannel(struct subchannel_id schid, int slow) | |
313 | { | |
314 | struct subchannel *sch; | |
315 | int ret; | |
316 | ||
317 | sch = get_subchannel_by_schid(schid); | |
318 | if (sch) { | |
319 | ret = css_evaluate_known_subchannel(sch, slow); | |
320 | put_device(&sch->dev); | |
321 | } else | |
322 | ret = css_evaluate_new_subchannel(schid, slow); | |
323 | ||
1da177e4 LT |
324 | return ret; |
325 | } | |
326 | ||
f97a56fb CH |
327 | static int |
328 | css_rescan_devices(struct subchannel_id schid, void *data) | |
1da177e4 | 329 | { |
f97a56fb | 330 | return css_evaluate_subchannel(schid, 1); |
1da177e4 LT |
331 | } |
332 | ||
333 | struct slow_subchannel { | |
334 | struct list_head slow_list; | |
a8237fc4 | 335 | struct subchannel_id schid; |
1da177e4 LT |
336 | }; |
337 | ||
338 | static LIST_HEAD(slow_subchannels_head); | |
339 | static DEFINE_SPINLOCK(slow_subchannel_lock); | |
340 | ||
341 | static void | |
4927b3f7 | 342 | css_trigger_slow_path(struct work_struct *unused) |
1da177e4 LT |
343 | { |
344 | CIO_TRACE_EVENT(4, "slowpath"); | |
345 | ||
346 | if (need_rescan) { | |
347 | need_rescan = 0; | |
f97a56fb | 348 | for_each_subchannel(css_rescan_devices, NULL); |
1da177e4 LT |
349 | return; |
350 | } | |
351 | ||
352 | spin_lock_irq(&slow_subchannel_lock); | |
353 | while (!list_empty(&slow_subchannels_head)) { | |
354 | struct slow_subchannel *slow_sch = | |
355 | list_entry(slow_subchannels_head.next, | |
356 | struct slow_subchannel, slow_list); | |
357 | ||
358 | list_del_init(slow_subchannels_head.next); | |
359 | spin_unlock_irq(&slow_subchannel_lock); | |
360 | css_evaluate_subchannel(slow_sch->schid, 1); | |
361 | spin_lock_irq(&slow_subchannel_lock); | |
362 | kfree(slow_sch); | |
363 | } | |
364 | spin_unlock_irq(&slow_subchannel_lock); | |
365 | } | |
366 | ||
4927b3f7 | 367 | DECLARE_WORK(slow_path_work, css_trigger_slow_path); |
1da177e4 LT |
368 | struct workqueue_struct *slow_path_wq; |
369 | ||
40154b82 PO |
370 | /* Reprobe subchannel if unregistered. */ |
371 | static int reprobe_subchannel(struct subchannel_id schid, void *data) | |
372 | { | |
373 | struct subchannel *sch; | |
374 | int ret; | |
375 | ||
376 | CIO_DEBUG(KERN_INFO, 6, "cio: reprobe 0.%x.%04x\n", | |
377 | schid.ssid, schid.sch_no); | |
378 | if (need_reprobe) | |
379 | return -EAGAIN; | |
380 | ||
381 | sch = get_subchannel_by_schid(schid); | |
382 | if (sch) { | |
383 | /* Already known. */ | |
384 | put_device(&sch->dev); | |
385 | return 0; | |
386 | } | |
387 | ||
388 | ret = css_probe_device(schid); | |
389 | switch (ret) { | |
390 | case 0: | |
391 | break; | |
392 | case -ENXIO: | |
393 | case -ENOMEM: | |
394 | /* These should abort looping */ | |
395 | break; | |
396 | default: | |
397 | ret = 0; | |
398 | } | |
399 | ||
400 | return ret; | |
401 | } | |
402 | ||
403 | /* Work function used to reprobe all unregistered subchannels. */ | |
4927b3f7 | 404 | static void reprobe_all(struct work_struct *unused) |
40154b82 PO |
405 | { |
406 | int ret; | |
407 | ||
408 | CIO_MSG_EVENT(2, "reprobe start\n"); | |
409 | ||
410 | need_reprobe = 0; | |
411 | /* Make sure initial subchannel scan is done. */ | |
412 | wait_event(ccw_device_init_wq, | |
413 | atomic_read(&ccw_device_init_count) == 0); | |
414 | ret = for_each_subchannel(reprobe_subchannel, NULL); | |
415 | ||
416 | CIO_MSG_EVENT(2, "reprobe done (rc=%d, need_reprobe=%d)\n", ret, | |
417 | need_reprobe); | |
418 | } | |
419 | ||
4927b3f7 | 420 | DECLARE_WORK(css_reprobe_work, reprobe_all); |
40154b82 PO |
421 | |
422 | /* Schedule reprobing of all unregistered subchannels. */ | |
423 | void css_schedule_reprobe(void) | |
424 | { | |
425 | need_reprobe = 1; | |
426 | queue_work(ccw_device_work, &css_reprobe_work); | |
427 | } | |
428 | ||
429 | EXPORT_SYMBOL_GPL(css_schedule_reprobe); | |
430 | ||
1da177e4 LT |
431 | /* |
432 | * Rescan for new devices. FIXME: This is slow. | |
433 | * This function is called when we have lost CRWs due to overflows and we have | |
434 | * to do subchannel housekeeping. | |
435 | */ | |
436 | void | |
437 | css_reiterate_subchannels(void) | |
438 | { | |
439 | css_clear_subchannel_slow_list(); | |
440 | need_rescan = 1; | |
441 | } | |
442 | ||
443 | /* | |
444 | * Called from the machine check handler for subchannel report words. | |
445 | */ | |
446 | int | |
fb6958a5 | 447 | css_process_crw(int rsid1, int rsid2) |
1da177e4 LT |
448 | { |
449 | int ret; | |
a8237fc4 | 450 | struct subchannel_id mchk_schid; |
1da177e4 | 451 | |
fb6958a5 CH |
452 | CIO_CRW_EVENT(2, "source is subchannel %04X, subsystem id %x\n", |
453 | rsid1, rsid2); | |
1da177e4 LT |
454 | |
455 | if (need_rescan) | |
456 | /* We need to iterate all subchannels anyway. */ | |
457 | return -EAGAIN; | |
a8237fc4 CH |
458 | |
459 | init_subchannel_id(&mchk_schid); | |
fb6958a5 CH |
460 | mchk_schid.sch_no = rsid1; |
461 | if (rsid2 != 0) | |
462 | mchk_schid.ssid = (rsid2 >> 8) & 3; | |
463 | ||
1da177e4 LT |
464 | /* |
465 | * Since we are always presented with IPI in the CRW, we have to | |
466 | * use stsch() to find out if the subchannel in question has come | |
467 | * or gone. | |
468 | */ | |
a8237fc4 | 469 | ret = css_evaluate_subchannel(mchk_schid, 0); |
1da177e4 | 470 | if (ret == -EAGAIN) { |
a8237fc4 | 471 | if (css_enqueue_subchannel_slow(mchk_schid)) { |
1da177e4 LT |
472 | css_clear_subchannel_slow_list(); |
473 | need_rescan = 1; | |
474 | } | |
475 | } | |
476 | return ret; | |
477 | } | |
478 | ||
f97a56fb CH |
479 | static int __init |
480 | __init_channel_subsystem(struct subchannel_id schid, void *data) | |
481 | { | |
482 | struct subchannel *sch; | |
483 | int ret; | |
484 | ||
485 | if (cio_is_console(schid)) | |
486 | sch = cio_get_console_subchannel(); | |
487 | else { | |
488 | sch = css_alloc_subchannel(schid); | |
489 | if (IS_ERR(sch)) | |
490 | ret = PTR_ERR(sch); | |
491 | else | |
492 | ret = 0; | |
493 | switch (ret) { | |
494 | case 0: | |
495 | break; | |
496 | case -ENOMEM: | |
497 | panic("Out of memory in init_channel_subsystem\n"); | |
498 | /* -ENXIO: no more subchannels. */ | |
499 | case -ENXIO: | |
500 | return ret; | |
e843e280 GS |
501 | /* -EIO: this subchannel set not supported. */ |
502 | case -EIO: | |
503 | return ret; | |
f97a56fb CH |
504 | default: |
505 | return 0; | |
506 | } | |
507 | } | |
508 | /* | |
509 | * We register ALL valid subchannels in ioinfo, even those | |
510 | * that have been present before init_channel_subsystem. | |
511 | * These subchannels can't have been registered yet (kmalloc | |
512 | * not working) so we do it now. This is true e.g. for the | |
513 | * console subchannel. | |
514 | */ | |
515 | css_register_subchannel(sch); | |
516 | return 0; | |
517 | } | |
518 | ||
1da177e4 | 519 | static void __init |
a28c6944 | 520 | css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
1da177e4 | 521 | { |
a28c6944 CH |
522 | if (css_characteristics_avail && css_general_characteristics.mcss) { |
523 | css->global_pgid.pgid_high.ext_cssid.version = 0x80; | |
524 | css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; | |
525 | } else { | |
1da177e4 | 526 | #ifdef CONFIG_SMP |
a28c6944 | 527 | css->global_pgid.pgid_high.cpu_addr = hard_smp_processor_id(); |
1da177e4 | 528 | #else |
a28c6944 | 529 | css->global_pgid.pgid_high.cpu_addr = 0; |
1da177e4 LT |
530 | #endif |
531 | } | |
a28c6944 CH |
532 | css->global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident; |
533 | css->global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine; | |
534 | css->global_pgid.tod_high = tod_high; | |
535 | ||
536 | } | |
537 | ||
3b793060 CH |
538 | static void |
539 | channel_subsystem_release(struct device *dev) | |
540 | { | |
541 | struct channel_subsystem *css; | |
542 | ||
543 | css = to_css(dev); | |
495a5b45 | 544 | mutex_destroy(&css->mutex); |
3b793060 CH |
545 | kfree(css); |
546 | } | |
547 | ||
495a5b45 CH |
548 | static ssize_t |
549 | css_cm_enable_show(struct device *dev, struct device_attribute *attr, | |
550 | char *buf) | |
551 | { | |
552 | struct channel_subsystem *css = to_css(dev); | |
553 | ||
554 | if (!css) | |
555 | return 0; | |
556 | return sprintf(buf, "%x\n", css->cm_enabled); | |
557 | } | |
558 | ||
559 | static ssize_t | |
560 | css_cm_enable_store(struct device *dev, struct device_attribute *attr, | |
561 | const char *buf, size_t count) | |
562 | { | |
563 | struct channel_subsystem *css = to_css(dev); | |
564 | int ret; | |
565 | ||
566 | switch (buf[0]) { | |
567 | case '0': | |
568 | ret = css->cm_enabled ? chsc_secm(css, 0) : 0; | |
569 | break; | |
570 | case '1': | |
571 | ret = css->cm_enabled ? 0 : chsc_secm(css, 1); | |
572 | break; | |
573 | default: | |
574 | ret = -EINVAL; | |
575 | } | |
576 | return ret < 0 ? ret : count; | |
577 | } | |
578 | ||
579 | static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); | |
580 | ||
d7b5a4c9 | 581 | static inline int __init setup_css(int nr) |
a28c6944 CH |
582 | { |
583 | u32 tod_high; | |
d7b5a4c9 | 584 | int ret; |
a28c6944 CH |
585 | |
586 | memset(css[nr], 0, sizeof(struct channel_subsystem)); | |
d7b5a4c9 CH |
587 | css[nr]->pseudo_subchannel = |
588 | kzalloc(sizeof(*css[nr]->pseudo_subchannel), GFP_KERNEL); | |
589 | if (!css[nr]->pseudo_subchannel) | |
590 | return -ENOMEM; | |
591 | css[nr]->pseudo_subchannel->dev.parent = &css[nr]->device; | |
592 | css[nr]->pseudo_subchannel->dev.release = css_subchannel_release; | |
593 | sprintf(css[nr]->pseudo_subchannel->dev.bus_id, "defunct"); | |
594 | ret = cio_create_sch_lock(css[nr]->pseudo_subchannel); | |
595 | if (ret) { | |
596 | kfree(css[nr]->pseudo_subchannel); | |
597 | return ret; | |
598 | } | |
495a5b45 | 599 | mutex_init(&css[nr]->mutex); |
a28c6944 CH |
600 | css[nr]->valid = 1; |
601 | css[nr]->cssid = nr; | |
602 | sprintf(css[nr]->device.bus_id, "css%x", nr); | |
3b793060 | 603 | css[nr]->device.release = channel_subsystem_release; |
a28c6944 CH |
604 | tod_high = (u32) (get_clock() >> 32); |
605 | css_generate_pgid(css[nr], tod_high); | |
d7b5a4c9 | 606 | return 0; |
1da177e4 LT |
607 | } |
608 | ||
609 | /* | |
610 | * Now that the driver core is running, we can setup our channel subsystem. | |
611 | * The struct subchannel's are created during probing (except for the | |
612 | * static console subchannel). | |
613 | */ | |
614 | static int __init | |
615 | init_channel_subsystem (void) | |
616 | { | |
a28c6944 | 617 | int ret, i; |
1da177e4 LT |
618 | |
619 | if (chsc_determine_css_characteristics() == 0) | |
620 | css_characteristics_avail = 1; | |
621 | ||
1da177e4 LT |
622 | if ((ret = bus_register(&css_bus_type))) |
623 | goto out; | |
1da177e4 | 624 | |
fb6958a5 CH |
625 | /* Try to enable MSS. */ |
626 | ret = chsc_enable_facility(CHSC_SDA_OC_MSS); | |
627 | switch (ret) { | |
628 | case 0: /* Success. */ | |
629 | max_ssid = __MAX_SSID; | |
630 | break; | |
631 | case -ENOMEM: | |
632 | goto out_bus; | |
633 | default: | |
634 | max_ssid = 0; | |
635 | } | |
a28c6944 CH |
636 | /* Setup css structure. */ |
637 | for (i = 0; i <= __MAX_CSSID; i++) { | |
638 | css[i] = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL); | |
639 | if (!css[i]) { | |
640 | ret = -ENOMEM; | |
fb6958a5 | 641 | goto out_unregister; |
a28c6944 | 642 | } |
d7b5a4c9 | 643 | ret = setup_css(i); |
a28c6944 CH |
644 | if (ret) |
645 | goto out_free; | |
d7b5a4c9 CH |
646 | ret = device_register(&css[i]->device); |
647 | if (ret) | |
648 | goto out_free_all; | |
7e560814 CH |
649 | if (css_characteristics_avail && |
650 | css_chsc_characteristics.secm) { | |
651 | ret = device_create_file(&css[i]->device, | |
652 | &dev_attr_cm_enable); | |
653 | if (ret) | |
654 | goto out_device; | |
655 | } | |
d7b5a4c9 CH |
656 | ret = device_register(&css[i]->pseudo_subchannel->dev); |
657 | if (ret) | |
658 | goto out_file; | |
a28c6944 | 659 | } |
1da177e4 LT |
660 | css_init_done = 1; |
661 | ||
662 | ctl_set_bit(6, 28); | |
663 | ||
f97a56fb | 664 | for_each_subchannel(__init_channel_subsystem, NULL); |
1da177e4 | 665 | return 0; |
d7b5a4c9 CH |
666 | out_file: |
667 | device_remove_file(&css[i]->device, &dev_attr_cm_enable); | |
7e560814 CH |
668 | out_device: |
669 | device_unregister(&css[i]->device); | |
d7b5a4c9 CH |
670 | out_free_all: |
671 | kfree(css[i]->pseudo_subchannel->lock); | |
672 | kfree(css[i]->pseudo_subchannel); | |
a28c6944 CH |
673 | out_free: |
674 | kfree(css[i]); | |
fb6958a5 | 675 | out_unregister: |
a28c6944 CH |
676 | while (i > 0) { |
677 | i--; | |
d7b5a4c9 | 678 | device_unregister(&css[i]->pseudo_subchannel->dev); |
495a5b45 CH |
679 | if (css_characteristics_avail && css_chsc_characteristics.secm) |
680 | device_remove_file(&css[i]->device, | |
681 | &dev_attr_cm_enable); | |
a28c6944 CH |
682 | device_unregister(&css[i]->device); |
683 | } | |
fb6958a5 | 684 | out_bus: |
1da177e4 LT |
685 | bus_unregister(&css_bus_type); |
686 | out: | |
687 | return ret; | |
688 | } | |
689 | ||
d7b5a4c9 CH |
690 | int sch_is_pseudo_sch(struct subchannel *sch) |
691 | { | |
692 | return sch == to_css(sch->dev.parent)->pseudo_subchannel; | |
693 | } | |
694 | ||
1da177e4 LT |
695 | /* |
696 | * find a driver for a subchannel. They identify by the subchannel | |
697 | * type with the exception that the console subchannel driver has its own | |
698 | * subchannel type although the device is an i/o subchannel | |
699 | */ | |
700 | static int | |
701 | css_bus_match (struct device *dev, struct device_driver *drv) | |
702 | { | |
703 | struct subchannel *sch = container_of (dev, struct subchannel, dev); | |
704 | struct css_driver *driver = container_of (drv, struct css_driver, drv); | |
705 | ||
706 | if (sch->st == driver->subchannel_type) | |
707 | return 1; | |
708 | ||
709 | return 0; | |
710 | } | |
711 | ||
8bbace7e CH |
712 | static int |
713 | css_probe (struct device *dev) | |
714 | { | |
715 | struct subchannel *sch; | |
716 | ||
717 | sch = to_subchannel(dev); | |
718 | sch->driver = container_of (dev->driver, struct css_driver, drv); | |
719 | return (sch->driver->probe ? sch->driver->probe(sch) : 0); | |
720 | } | |
721 | ||
722 | static int | |
723 | css_remove (struct device *dev) | |
724 | { | |
725 | struct subchannel *sch; | |
726 | ||
727 | sch = to_subchannel(dev); | |
728 | return (sch->driver->remove ? sch->driver->remove(sch) : 0); | |
729 | } | |
730 | ||
731 | static void | |
732 | css_shutdown (struct device *dev) | |
733 | { | |
734 | struct subchannel *sch; | |
735 | ||
736 | sch = to_subchannel(dev); | |
737 | if (sch->driver->shutdown) | |
738 | sch->driver->shutdown(sch); | |
739 | } | |
740 | ||
1da177e4 | 741 | struct bus_type css_bus_type = { |
8bbace7e CH |
742 | .name = "css", |
743 | .match = css_bus_match, | |
744 | .probe = css_probe, | |
745 | .remove = css_remove, | |
746 | .shutdown = css_shutdown, | |
1da177e4 LT |
747 | }; |
748 | ||
749 | subsys_initcall(init_channel_subsystem); | |
750 | ||
1da177e4 | 751 | int |
a8237fc4 | 752 | css_enqueue_subchannel_slow(struct subchannel_id schid) |
1da177e4 LT |
753 | { |
754 | struct slow_subchannel *new_slow_sch; | |
755 | unsigned long flags; | |
756 | ||
88abaab4 | 757 | new_slow_sch = kzalloc(sizeof(struct slow_subchannel), GFP_ATOMIC); |
1da177e4 LT |
758 | if (!new_slow_sch) |
759 | return -ENOMEM; | |
1da177e4 LT |
760 | new_slow_sch->schid = schid; |
761 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
762 | list_add_tail(&new_slow_sch->slow_list, &slow_subchannels_head); | |
763 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
764 | return 0; | |
765 | } | |
766 | ||
767 | void | |
768 | css_clear_subchannel_slow_list(void) | |
769 | { | |
770 | unsigned long flags; | |
771 | ||
772 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
773 | while (!list_empty(&slow_subchannels_head)) { | |
774 | struct slow_subchannel *slow_sch = | |
775 | list_entry(slow_subchannels_head.next, | |
776 | struct slow_subchannel, slow_list); | |
777 | ||
778 | list_del_init(slow_subchannels_head.next); | |
779 | kfree(slow_sch); | |
780 | } | |
781 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
782 | } | |
783 | ||
784 | ||
785 | ||
786 | int | |
787 | css_slow_subchannels_exist(void) | |
788 | { | |
789 | return (!list_empty(&slow_subchannels_head)); | |
790 | } | |
791 | ||
792 | MODULE_LICENSE("GPL"); | |
793 | EXPORT_SYMBOL(css_bus_type); | |
1da177e4 | 794 | EXPORT_SYMBOL_GPL(css_characteristics_avail); |