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" |
83b3370c | 23 | #include "idset.h" |
7ad6a249 | 24 | #include "chp.h" |
1da177e4 | 25 | |
1da177e4 | 26 | int css_init_done = 0; |
40154b82 | 27 | static int need_reprobe = 0; |
fb6958a5 | 28 | static int max_ssid = 0; |
1da177e4 | 29 | |
a28c6944 | 30 | struct channel_subsystem *css[__MAX_CSSID + 1]; |
1da177e4 | 31 | |
a28c6944 | 32 | int css_characteristics_avail = 0; |
1da177e4 | 33 | |
4d284cac | 34 | int |
f97a56fb CH |
35 | for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data) |
36 | { | |
37 | struct subchannel_id schid; | |
38 | int ret; | |
39 | ||
40 | init_subchannel_id(&schid); | |
41 | ret = -ENODEV; | |
42 | do { | |
fb6958a5 CH |
43 | do { |
44 | ret = fn(schid, data); | |
45 | if (ret) | |
46 | break; | |
47 | } while (schid.sch_no++ < __MAX_SUBCHANNEL); | |
48 | schid.sch_no = 0; | |
49 | } while (schid.ssid++ < max_ssid); | |
f97a56fb CH |
50 | return ret; |
51 | } | |
52 | ||
1da177e4 | 53 | static struct subchannel * |
a8237fc4 | 54 | css_alloc_subchannel(struct subchannel_id schid) |
1da177e4 LT |
55 | { |
56 | struct subchannel *sch; | |
57 | int ret; | |
58 | ||
59 | sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA); | |
60 | if (sch == NULL) | |
61 | return ERR_PTR(-ENOMEM); | |
a8237fc4 | 62 | ret = cio_validate_subchannel (sch, schid); |
1da177e4 LT |
63 | if (ret < 0) { |
64 | kfree(sch); | |
65 | return ERR_PTR(ret); | |
66 | } | |
1da177e4 LT |
67 | |
68 | if (sch->st != SUBCHANNEL_TYPE_IO) { | |
69 | /* For now we ignore all non-io subchannels. */ | |
70 | kfree(sch); | |
71 | return ERR_PTR(-EINVAL); | |
72 | } | |
73 | ||
74 | /* | |
75 | * Set intparm to subchannel address. | |
76 | * This is fine even on 64bit since the subchannel is always located | |
77 | * under 2G. | |
78 | */ | |
79 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; | |
80 | ret = cio_modify(sch); | |
81 | if (ret) { | |
82 | kfree(sch); | |
83 | return ERR_PTR(ret); | |
84 | } | |
85 | return sch; | |
86 | } | |
87 | ||
88 | static void | |
89 | css_free_subchannel(struct subchannel *sch) | |
90 | { | |
91 | if (sch) { | |
92 | /* Reset intparm to zeroes. */ | |
93 | sch->schib.pmcw.intparm = 0; | |
94 | cio_modify(sch); | |
2ec22984 | 95 | kfree(sch->lock); |
1da177e4 LT |
96 | kfree(sch); |
97 | } | |
1da177e4 LT |
98 | } |
99 | ||
100 | static void | |
101 | css_subchannel_release(struct device *dev) | |
102 | { | |
103 | struct subchannel *sch; | |
104 | ||
105 | sch = to_subchannel(dev); | |
2ec22984 CH |
106 | if (!cio_is_console(sch->schid)) { |
107 | kfree(sch->lock); | |
1da177e4 | 108 | kfree(sch); |
2ec22984 | 109 | } |
1da177e4 LT |
110 | } |
111 | ||
07c6a338 | 112 | static int css_sch_device_register(struct subchannel *sch) |
6ab4879a CH |
113 | { |
114 | int ret; | |
115 | ||
116 | mutex_lock(&sch->reg_mutex); | |
117 | ret = device_register(&sch->dev); | |
118 | mutex_unlock(&sch->reg_mutex); | |
119 | return ret; | |
120 | } | |
121 | ||
122 | void css_sch_device_unregister(struct subchannel *sch) | |
123 | { | |
124 | mutex_lock(&sch->reg_mutex); | |
125 | device_unregister(&sch->dev); | |
126 | mutex_unlock(&sch->reg_mutex); | |
127 | } | |
128 | ||
7ad6a249 PO |
129 | static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw) |
130 | { | |
131 | int i; | |
132 | int mask; | |
133 | ||
134 | memset(ssd, 0, sizeof(struct chsc_ssd_info)); | |
135 | ssd->path_mask = pmcw->pim; | |
136 | for (i = 0; i < 8; i++) { | |
137 | mask = 0x80 >> i; | |
138 | if (pmcw->pim & mask) { | |
139 | chp_id_init(&ssd->chpid[i]); | |
140 | ssd->chpid[i].id = pmcw->chpid[i]; | |
141 | } | |
142 | } | |
143 | } | |
144 | ||
145 | static void ssd_register_chpids(struct chsc_ssd_info *ssd) | |
146 | { | |
147 | int i; | |
148 | int mask; | |
149 | ||
150 | for (i = 0; i < 8; i++) { | |
151 | mask = 0x80 >> i; | |
152 | if (ssd->path_mask & mask) | |
153 | if (!chp_is_registered(ssd->chpid[i])) | |
154 | chp_new(ssd->chpid[i]); | |
155 | } | |
156 | } | |
157 | ||
158 | void css_update_ssd_info(struct subchannel *sch) | |
159 | { | |
160 | int ret; | |
161 | ||
162 | if (cio_is_console(sch->schid)) { | |
163 | /* Console is initialized too early for functions requiring | |
164 | * memory allocation. */ | |
165 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); | |
166 | } else { | |
167 | ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info); | |
168 | if (ret) | |
169 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); | |
170 | ssd_register_chpids(&sch->ssd_info); | |
171 | } | |
172 | } | |
173 | ||
174 | static int css_register_subchannel(struct subchannel *sch) | |
1da177e4 LT |
175 | { |
176 | int ret; | |
177 | ||
178 | /* Initialize the subchannel structure */ | |
a28c6944 | 179 | sch->dev.parent = &css[0]->device; |
1da177e4 LT |
180 | sch->dev.bus = &css_bus_type; |
181 | sch->dev.release = &css_subchannel_release; | |
529192f3 | 182 | sch->dev.groups = subch_attr_groups; |
7ad6a249 | 183 | css_update_ssd_info(sch); |
1da177e4 | 184 | /* make it known to the system */ |
6ab4879a | 185 | ret = css_sch_device_register(sch); |
7674da77 | 186 | if (ret) { |
1da177e4 LT |
187 | printk (KERN_WARNING "%s: could not register %s\n", |
188 | __func__, sch->dev.bus_id); | |
7674da77 CH |
189 | return ret; |
190 | } | |
1da177e4 LT |
191 | return ret; |
192 | } | |
193 | ||
f7e5d67c | 194 | static int css_probe_device(struct subchannel_id schid) |
1da177e4 LT |
195 | { |
196 | int ret; | |
197 | struct subchannel *sch; | |
198 | ||
a8237fc4 | 199 | sch = css_alloc_subchannel(schid); |
1da177e4 LT |
200 | if (IS_ERR(sch)) |
201 | return PTR_ERR(sch); | |
202 | ret = css_register_subchannel(sch); | |
203 | if (ret) | |
204 | css_free_subchannel(sch); | |
205 | return ret; | |
206 | } | |
207 | ||
b0744bd2 CH |
208 | static int |
209 | check_subchannel(struct device * dev, void * data) | |
210 | { | |
211 | struct subchannel *sch; | |
a8237fc4 | 212 | struct subchannel_id *schid = data; |
b0744bd2 CH |
213 | |
214 | sch = to_subchannel(dev); | |
a8237fc4 | 215 | return schid_equal(&sch->schid, schid); |
b0744bd2 CH |
216 | } |
217 | ||
1da177e4 | 218 | struct subchannel * |
a8237fc4 | 219 | get_subchannel_by_schid(struct subchannel_id schid) |
1da177e4 | 220 | { |
1da177e4 LT |
221 | struct device *dev; |
222 | ||
b0744bd2 | 223 | dev = bus_find_device(&css_bus_type, NULL, |
12975aef | 224 | &schid, check_subchannel); |
1da177e4 | 225 | |
b0744bd2 | 226 | return dev ? to_subchannel(dev) : NULL; |
1da177e4 LT |
227 | } |
228 | ||
4d284cac | 229 | static int css_get_subchannel_status(struct subchannel *sch) |
1da177e4 LT |
230 | { |
231 | struct schib schib; | |
1da177e4 | 232 | |
564337f3 | 233 | if (stsch(sch->schid, &schib) || !schib.pmcw.dnv) |
1da177e4 | 234 | return CIO_GONE; |
564337f3 | 235 | if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev)) |
1da177e4 | 236 | return CIO_REVALIDATE; |
564337f3 | 237 | if (!sch->lpm) |
1da177e4 LT |
238 | return CIO_NO_PATH; |
239 | return CIO_OPER; | |
240 | } | |
564337f3 PO |
241 | |
242 | static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) | |
1da177e4 LT |
243 | { |
244 | int event, ret, disc; | |
1da177e4 | 245 | unsigned long flags; |
564337f3 | 246 | enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE } action; |
1da177e4 | 247 | |
2ec22984 | 248 | spin_lock_irqsave(sch->lock, flags); |
564337f3 | 249 | disc = device_is_disconnected(sch); |
1da177e4 | 250 | if (disc && slow) { |
564337f3 | 251 | /* Disconnected devices are evaluated directly only.*/ |
2ec22984 | 252 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 253 | return 0; |
1da177e4 | 254 | } |
564337f3 PO |
255 | /* No interrupt after machine check - kill pending timers. */ |
256 | device_kill_pending_timer(sch); | |
1da177e4 | 257 | if (!disc && !slow) { |
564337f3 | 258 | /* Non-disconnected devices are evaluated on the slow path. */ |
2ec22984 | 259 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 260 | return -EAGAIN; |
1da177e4 | 261 | } |
564337f3 | 262 | event = css_get_subchannel_status(sch); |
fb6958a5 | 263 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n", |
564337f3 PO |
264 | sch->schid.ssid, sch->schid.sch_no, event, |
265 | disc ? "disconnected" : "normal", | |
266 | slow ? "slow" : "fast"); | |
267 | /* Analyze subchannel status. */ | |
268 | action = NONE; | |
1da177e4 LT |
269 | switch (event) { |
270 | case CIO_NO_PATH: | |
564337f3 PO |
271 | if (disc) { |
272 | /* Check if paths have become available. */ | |
273 | action = REPROBE; | |
1da177e4 LT |
274 | break; |
275 | } | |
564337f3 PO |
276 | /* fall through */ |
277 | case CIO_GONE: | |
278 | /* Prevent unwanted effects when opening lock. */ | |
279 | cio_disable_subchannel(sch); | |
280 | device_set_disconnected(sch); | |
281 | /* Ask driver what to do with device. */ | |
282 | action = UNREGISTER; | |
283 | if (sch->driver && sch->driver->notify) { | |
2ec22984 | 284 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 285 | ret = sch->driver->notify(&sch->dev, event); |
2ec22984 | 286 | spin_lock_irqsave(sch->lock, flags); |
564337f3 PO |
287 | if (ret) |
288 | action = NONE; | |
1da177e4 | 289 | } |
1da177e4 LT |
290 | break; |
291 | case CIO_REVALIDATE: | |
564337f3 PO |
292 | /* Device will be removed, so no notify necessary. */ |
293 | if (disc) | |
294 | /* Reprobe because immediate unregister might block. */ | |
295 | action = REPROBE; | |
296 | else | |
297 | action = UNREGISTER_PROBE; | |
1da177e4 LT |
298 | break; |
299 | case CIO_OPER: | |
564337f3 | 300 | if (disc) |
1da177e4 | 301 | /* Get device operational again. */ |
564337f3 PO |
302 | action = REPROBE; |
303 | break; | |
304 | } | |
305 | /* Perform action. */ | |
306 | ret = 0; | |
307 | switch (action) { | |
308 | case UNREGISTER: | |
309 | case UNREGISTER_PROBE: | |
310 | /* Unregister device (will use subchannel lock). */ | |
2ec22984 | 311 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 312 | css_sch_device_unregister(sch); |
2ec22984 | 313 | spin_lock_irqsave(sch->lock, flags); |
564337f3 PO |
314 | |
315 | /* Reset intparm to zeroes. */ | |
316 | sch->schib.pmcw.intparm = 0; | |
317 | cio_modify(sch); | |
564337f3 PO |
318 | break; |
319 | case REPROBE: | |
320 | device_trigger_reprobe(sch); | |
1da177e4 LT |
321 | break; |
322 | default: | |
564337f3 PO |
323 | break; |
324 | } | |
2ec22984 | 325 | spin_unlock_irqrestore(sch->lock, flags); |
c2b1449b CH |
326 | /* Probe if necessary. */ |
327 | if (action == UNREGISTER_PROBE) | |
328 | ret = css_probe_device(sch->schid); | |
564337f3 PO |
329 | |
330 | return ret; | |
331 | } | |
332 | ||
333 | static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) | |
334 | { | |
335 | struct schib schib; | |
336 | ||
337 | if (!slow) { | |
338 | /* Will be done on the slow path. */ | |
339 | return -EAGAIN; | |
340 | } | |
758976f9 | 341 | if (stsch_err(schid, &schib) || !schib.pmcw.dnv) { |
564337f3 PO |
342 | /* Unusable - ignore. */ |
343 | return 0; | |
1da177e4 | 344 | } |
564337f3 PO |
345 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, unknown, " |
346 | "slow path.\n", schid.ssid, schid.sch_no, CIO_OPER); | |
347 | ||
348 | return css_probe_device(schid); | |
349 | } | |
350 | ||
83b3370c | 351 | static void css_evaluate_subchannel(struct subchannel_id schid, int slow) |
564337f3 PO |
352 | { |
353 | struct subchannel *sch; | |
354 | int ret; | |
355 | ||
356 | sch = get_subchannel_by_schid(schid); | |
357 | if (sch) { | |
358 | ret = css_evaluate_known_subchannel(sch, slow); | |
359 | put_device(&sch->dev); | |
360 | } else | |
361 | ret = css_evaluate_new_subchannel(schid, slow); | |
83b3370c PO |
362 | if (ret == -EAGAIN) |
363 | css_schedule_eval(schid); | |
1da177e4 LT |
364 | } |
365 | ||
83b3370c PO |
366 | static struct idset *slow_subchannel_set; |
367 | static spinlock_t slow_subchannel_lock; | |
368 | ||
369 | static int __init slow_subchannel_init(void) | |
1da177e4 | 370 | { |
83b3370c PO |
371 | spin_lock_init(&slow_subchannel_lock); |
372 | slow_subchannel_set = idset_sch_new(); | |
373 | if (!slow_subchannel_set) { | |
374 | printk(KERN_WARNING "cio: could not allocate slow subchannel " | |
375 | "set\n"); | |
376 | return -ENOMEM; | |
377 | } | |
378 | return 0; | |
1da177e4 LT |
379 | } |
380 | ||
83b3370c | 381 | subsys_initcall(slow_subchannel_init); |
1da177e4 | 382 | |
83b3370c | 383 | static void css_slow_path_func(struct work_struct *unused) |
1da177e4 | 384 | { |
83b3370c | 385 | struct subchannel_id schid; |
1da177e4 | 386 | |
83b3370c | 387 | CIO_TRACE_EVENT(4, "slowpath"); |
1da177e4 | 388 | spin_lock_irq(&slow_subchannel_lock); |
83b3370c PO |
389 | init_subchannel_id(&schid); |
390 | while (idset_sch_get_first(slow_subchannel_set, &schid)) { | |
391 | idset_sch_del(slow_subchannel_set, schid); | |
1da177e4 | 392 | spin_unlock_irq(&slow_subchannel_lock); |
83b3370c | 393 | css_evaluate_subchannel(schid, 1); |
1da177e4 | 394 | spin_lock_irq(&slow_subchannel_lock); |
1da177e4 LT |
395 | } |
396 | spin_unlock_irq(&slow_subchannel_lock); | |
397 | } | |
398 | ||
83b3370c | 399 | static DECLARE_WORK(slow_path_work, css_slow_path_func); |
1da177e4 LT |
400 | struct workqueue_struct *slow_path_wq; |
401 | ||
83b3370c PO |
402 | void css_schedule_eval(struct subchannel_id schid) |
403 | { | |
404 | unsigned long flags; | |
405 | ||
406 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
407 | idset_sch_add(slow_subchannel_set, schid); | |
408 | queue_work(slow_path_wq, &slow_path_work); | |
409 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
410 | } | |
411 | ||
412 | void css_schedule_eval_all(void) | |
413 | { | |
414 | unsigned long flags; | |
415 | ||
416 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
417 | idset_fill(slow_subchannel_set); | |
418 | queue_work(slow_path_wq, &slow_path_work); | |
419 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
420 | } | |
421 | ||
40154b82 PO |
422 | /* Reprobe subchannel if unregistered. */ |
423 | static int reprobe_subchannel(struct subchannel_id schid, void *data) | |
424 | { | |
425 | struct subchannel *sch; | |
426 | int ret; | |
427 | ||
428 | CIO_DEBUG(KERN_INFO, 6, "cio: reprobe 0.%x.%04x\n", | |
429 | schid.ssid, schid.sch_no); | |
430 | if (need_reprobe) | |
431 | return -EAGAIN; | |
432 | ||
433 | sch = get_subchannel_by_schid(schid); | |
434 | if (sch) { | |
435 | /* Already known. */ | |
436 | put_device(&sch->dev); | |
437 | return 0; | |
438 | } | |
439 | ||
440 | ret = css_probe_device(schid); | |
441 | switch (ret) { | |
442 | case 0: | |
443 | break; | |
444 | case -ENXIO: | |
445 | case -ENOMEM: | |
446 | /* These should abort looping */ | |
447 | break; | |
448 | default: | |
449 | ret = 0; | |
450 | } | |
451 | ||
452 | return ret; | |
453 | } | |
454 | ||
455 | /* Work function used to reprobe all unregistered subchannels. */ | |
4927b3f7 | 456 | static void reprobe_all(struct work_struct *unused) |
40154b82 PO |
457 | { |
458 | int ret; | |
459 | ||
460 | CIO_MSG_EVENT(2, "reprobe start\n"); | |
461 | ||
462 | need_reprobe = 0; | |
463 | /* Make sure initial subchannel scan is done. */ | |
464 | wait_event(ccw_device_init_wq, | |
465 | atomic_read(&ccw_device_init_count) == 0); | |
466 | ret = for_each_subchannel(reprobe_subchannel, NULL); | |
467 | ||
468 | CIO_MSG_EVENT(2, "reprobe done (rc=%d, need_reprobe=%d)\n", ret, | |
469 | need_reprobe); | |
470 | } | |
471 | ||
2b67fc46 | 472 | static DECLARE_WORK(css_reprobe_work, reprobe_all); |
40154b82 PO |
473 | |
474 | /* Schedule reprobing of all unregistered subchannels. */ | |
475 | void css_schedule_reprobe(void) | |
476 | { | |
477 | need_reprobe = 1; | |
478 | queue_work(ccw_device_work, &css_reprobe_work); | |
479 | } | |
480 | ||
481 | EXPORT_SYMBOL_GPL(css_schedule_reprobe); | |
482 | ||
1da177e4 LT |
483 | /* |
484 | * Called from the machine check handler for subchannel report words. | |
485 | */ | |
83b3370c | 486 | void css_process_crw(int rsid1, int rsid2) |
1da177e4 | 487 | { |
a8237fc4 | 488 | struct subchannel_id mchk_schid; |
1da177e4 | 489 | |
fb6958a5 CH |
490 | CIO_CRW_EVENT(2, "source is subchannel %04X, subsystem id %x\n", |
491 | rsid1, rsid2); | |
a8237fc4 | 492 | init_subchannel_id(&mchk_schid); |
fb6958a5 CH |
493 | mchk_schid.sch_no = rsid1; |
494 | if (rsid2 != 0) | |
495 | mchk_schid.ssid = (rsid2 >> 8) & 3; | |
496 | ||
1da177e4 LT |
497 | /* |
498 | * Since we are always presented with IPI in the CRW, we have to | |
499 | * use stsch() to find out if the subchannel in question has come | |
500 | * or gone. | |
501 | */ | |
83b3370c | 502 | css_evaluate_subchannel(mchk_schid, 0); |
1da177e4 LT |
503 | } |
504 | ||
f97a56fb CH |
505 | static int __init |
506 | __init_channel_subsystem(struct subchannel_id schid, void *data) | |
507 | { | |
508 | struct subchannel *sch; | |
509 | int ret; | |
510 | ||
511 | if (cio_is_console(schid)) | |
512 | sch = cio_get_console_subchannel(); | |
513 | else { | |
514 | sch = css_alloc_subchannel(schid); | |
515 | if (IS_ERR(sch)) | |
516 | ret = PTR_ERR(sch); | |
517 | else | |
518 | ret = 0; | |
519 | switch (ret) { | |
520 | case 0: | |
521 | break; | |
522 | case -ENOMEM: | |
523 | panic("Out of memory in init_channel_subsystem\n"); | |
524 | /* -ENXIO: no more subchannels. */ | |
525 | case -ENXIO: | |
526 | return ret; | |
e843e280 GS |
527 | /* -EIO: this subchannel set not supported. */ |
528 | case -EIO: | |
529 | return ret; | |
f97a56fb CH |
530 | default: |
531 | return 0; | |
532 | } | |
533 | } | |
534 | /* | |
535 | * We register ALL valid subchannels in ioinfo, even those | |
536 | * that have been present before init_channel_subsystem. | |
537 | * These subchannels can't have been registered yet (kmalloc | |
538 | * not working) so we do it now. This is true e.g. for the | |
539 | * console subchannel. | |
540 | */ | |
541 | css_register_subchannel(sch); | |
542 | return 0; | |
543 | } | |
544 | ||
1da177e4 | 545 | static void __init |
a28c6944 | 546 | css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
1da177e4 | 547 | { |
a28c6944 CH |
548 | if (css_characteristics_avail && css_general_characteristics.mcss) { |
549 | css->global_pgid.pgid_high.ext_cssid.version = 0x80; | |
550 | css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; | |
551 | } else { | |
1da177e4 | 552 | #ifdef CONFIG_SMP |
a28c6944 | 553 | css->global_pgid.pgid_high.cpu_addr = hard_smp_processor_id(); |
1da177e4 | 554 | #else |
a28c6944 | 555 | css->global_pgid.pgid_high.cpu_addr = 0; |
1da177e4 LT |
556 | #endif |
557 | } | |
a28c6944 CH |
558 | css->global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident; |
559 | css->global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine; | |
560 | css->global_pgid.tod_high = tod_high; | |
561 | ||
562 | } | |
563 | ||
3b793060 CH |
564 | static void |
565 | channel_subsystem_release(struct device *dev) | |
566 | { | |
567 | struct channel_subsystem *css; | |
568 | ||
569 | css = to_css(dev); | |
495a5b45 | 570 | mutex_destroy(&css->mutex); |
3b793060 CH |
571 | kfree(css); |
572 | } | |
573 | ||
495a5b45 CH |
574 | static ssize_t |
575 | css_cm_enable_show(struct device *dev, struct device_attribute *attr, | |
576 | char *buf) | |
577 | { | |
578 | struct channel_subsystem *css = to_css(dev); | |
579 | ||
580 | if (!css) | |
581 | return 0; | |
582 | return sprintf(buf, "%x\n", css->cm_enabled); | |
583 | } | |
584 | ||
585 | static ssize_t | |
586 | css_cm_enable_store(struct device *dev, struct device_attribute *attr, | |
587 | const char *buf, size_t count) | |
588 | { | |
589 | struct channel_subsystem *css = to_css(dev); | |
590 | int ret; | |
591 | ||
592 | switch (buf[0]) { | |
593 | case '0': | |
594 | ret = css->cm_enabled ? chsc_secm(css, 0) : 0; | |
595 | break; | |
596 | case '1': | |
597 | ret = css->cm_enabled ? 0 : chsc_secm(css, 1); | |
598 | break; | |
599 | default: | |
600 | ret = -EINVAL; | |
601 | } | |
602 | return ret < 0 ? ret : count; | |
603 | } | |
604 | ||
605 | static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); | |
606 | ||
4d284cac | 607 | static int __init setup_css(int nr) |
a28c6944 CH |
608 | { |
609 | u32 tod_high; | |
d7b5a4c9 | 610 | int ret; |
a28c6944 CH |
611 | |
612 | memset(css[nr], 0, sizeof(struct channel_subsystem)); | |
d7b5a4c9 CH |
613 | css[nr]->pseudo_subchannel = |
614 | kzalloc(sizeof(*css[nr]->pseudo_subchannel), GFP_KERNEL); | |
615 | if (!css[nr]->pseudo_subchannel) | |
616 | return -ENOMEM; | |
617 | css[nr]->pseudo_subchannel->dev.parent = &css[nr]->device; | |
618 | css[nr]->pseudo_subchannel->dev.release = css_subchannel_release; | |
619 | sprintf(css[nr]->pseudo_subchannel->dev.bus_id, "defunct"); | |
620 | ret = cio_create_sch_lock(css[nr]->pseudo_subchannel); | |
621 | if (ret) { | |
622 | kfree(css[nr]->pseudo_subchannel); | |
623 | return ret; | |
624 | } | |
495a5b45 | 625 | mutex_init(&css[nr]->mutex); |
a28c6944 CH |
626 | css[nr]->valid = 1; |
627 | css[nr]->cssid = nr; | |
628 | sprintf(css[nr]->device.bus_id, "css%x", nr); | |
3b793060 | 629 | css[nr]->device.release = channel_subsystem_release; |
a28c6944 CH |
630 | tod_high = (u32) (get_clock() >> 32); |
631 | css_generate_pgid(css[nr], tod_high); | |
d7b5a4c9 | 632 | return 0; |
1da177e4 LT |
633 | } |
634 | ||
635 | /* | |
636 | * Now that the driver core is running, we can setup our channel subsystem. | |
637 | * The struct subchannel's are created during probing (except for the | |
638 | * static console subchannel). | |
639 | */ | |
640 | static int __init | |
641 | init_channel_subsystem (void) | |
642 | { | |
a28c6944 | 643 | int ret, i; |
1da177e4 LT |
644 | |
645 | if (chsc_determine_css_characteristics() == 0) | |
646 | css_characteristics_avail = 1; | |
647 | ||
1da177e4 LT |
648 | if ((ret = bus_register(&css_bus_type))) |
649 | goto out; | |
1da177e4 | 650 | |
fb6958a5 CH |
651 | /* Try to enable MSS. */ |
652 | ret = chsc_enable_facility(CHSC_SDA_OC_MSS); | |
653 | switch (ret) { | |
654 | case 0: /* Success. */ | |
655 | max_ssid = __MAX_SSID; | |
656 | break; | |
657 | case -ENOMEM: | |
658 | goto out_bus; | |
659 | default: | |
660 | max_ssid = 0; | |
661 | } | |
a28c6944 CH |
662 | /* Setup css structure. */ |
663 | for (i = 0; i <= __MAX_CSSID; i++) { | |
664 | css[i] = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL); | |
665 | if (!css[i]) { | |
666 | ret = -ENOMEM; | |
fb6958a5 | 667 | goto out_unregister; |
a28c6944 | 668 | } |
d7b5a4c9 | 669 | ret = setup_css(i); |
a28c6944 CH |
670 | if (ret) |
671 | goto out_free; | |
d7b5a4c9 CH |
672 | ret = device_register(&css[i]->device); |
673 | if (ret) | |
674 | goto out_free_all; | |
7e560814 CH |
675 | if (css_characteristics_avail && |
676 | css_chsc_characteristics.secm) { | |
677 | ret = device_create_file(&css[i]->device, | |
678 | &dev_attr_cm_enable); | |
679 | if (ret) | |
680 | goto out_device; | |
681 | } | |
d7b5a4c9 CH |
682 | ret = device_register(&css[i]->pseudo_subchannel->dev); |
683 | if (ret) | |
684 | goto out_file; | |
a28c6944 | 685 | } |
1da177e4 LT |
686 | css_init_done = 1; |
687 | ||
688 | ctl_set_bit(6, 28); | |
689 | ||
f97a56fb | 690 | for_each_subchannel(__init_channel_subsystem, NULL); |
1da177e4 | 691 | return 0; |
d7b5a4c9 CH |
692 | out_file: |
693 | device_remove_file(&css[i]->device, &dev_attr_cm_enable); | |
7e560814 CH |
694 | out_device: |
695 | device_unregister(&css[i]->device); | |
d7b5a4c9 CH |
696 | out_free_all: |
697 | kfree(css[i]->pseudo_subchannel->lock); | |
698 | kfree(css[i]->pseudo_subchannel); | |
a28c6944 CH |
699 | out_free: |
700 | kfree(css[i]); | |
fb6958a5 | 701 | out_unregister: |
a28c6944 CH |
702 | while (i > 0) { |
703 | i--; | |
d7b5a4c9 | 704 | device_unregister(&css[i]->pseudo_subchannel->dev); |
495a5b45 CH |
705 | if (css_characteristics_avail && css_chsc_characteristics.secm) |
706 | device_remove_file(&css[i]->device, | |
707 | &dev_attr_cm_enable); | |
a28c6944 CH |
708 | device_unregister(&css[i]->device); |
709 | } | |
fb6958a5 | 710 | out_bus: |
1da177e4 LT |
711 | bus_unregister(&css_bus_type); |
712 | out: | |
713 | return ret; | |
714 | } | |
715 | ||
d7b5a4c9 CH |
716 | int sch_is_pseudo_sch(struct subchannel *sch) |
717 | { | |
718 | return sch == to_css(sch->dev.parent)->pseudo_subchannel; | |
719 | } | |
720 | ||
1da177e4 LT |
721 | /* |
722 | * find a driver for a subchannel. They identify by the subchannel | |
723 | * type with the exception that the console subchannel driver has its own | |
724 | * subchannel type although the device is an i/o subchannel | |
725 | */ | |
726 | static int | |
727 | css_bus_match (struct device *dev, struct device_driver *drv) | |
728 | { | |
729 | struct subchannel *sch = container_of (dev, struct subchannel, dev); | |
730 | struct css_driver *driver = container_of (drv, struct css_driver, drv); | |
731 | ||
732 | if (sch->st == driver->subchannel_type) | |
733 | return 1; | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
8bbace7e CH |
738 | static int |
739 | css_probe (struct device *dev) | |
740 | { | |
741 | struct subchannel *sch; | |
742 | ||
743 | sch = to_subchannel(dev); | |
744 | sch->driver = container_of (dev->driver, struct css_driver, drv); | |
745 | return (sch->driver->probe ? sch->driver->probe(sch) : 0); | |
746 | } | |
747 | ||
748 | static int | |
749 | css_remove (struct device *dev) | |
750 | { | |
751 | struct subchannel *sch; | |
752 | ||
753 | sch = to_subchannel(dev); | |
754 | return (sch->driver->remove ? sch->driver->remove(sch) : 0); | |
755 | } | |
756 | ||
757 | static void | |
758 | css_shutdown (struct device *dev) | |
759 | { | |
760 | struct subchannel *sch; | |
761 | ||
762 | sch = to_subchannel(dev); | |
763 | if (sch->driver->shutdown) | |
764 | sch->driver->shutdown(sch); | |
765 | } | |
766 | ||
1da177e4 | 767 | struct bus_type css_bus_type = { |
8bbace7e CH |
768 | .name = "css", |
769 | .match = css_bus_match, | |
770 | .probe = css_probe, | |
771 | .remove = css_remove, | |
772 | .shutdown = css_shutdown, | |
1da177e4 LT |
773 | }; |
774 | ||
775 | subsys_initcall(init_channel_subsystem); | |
776 | ||
1da177e4 LT |
777 | MODULE_LICENSE("GPL"); |
778 | EXPORT_SYMBOL(css_bus_type); | |
1da177e4 | 779 | EXPORT_SYMBOL_GPL(css_characteristics_avail); |