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 | ||
6ab4879a CH |
112 | int css_sch_device_register(struct subchannel *sch) |
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 | ||
194 | int | |
a8237fc4 | 195 | css_probe_device(struct subchannel_id schid) |
1da177e4 LT |
196 | { |
197 | int ret; | |
198 | struct subchannel *sch; | |
199 | ||
a8237fc4 | 200 | sch = css_alloc_subchannel(schid); |
1da177e4 LT |
201 | if (IS_ERR(sch)) |
202 | return PTR_ERR(sch); | |
203 | ret = css_register_subchannel(sch); | |
204 | if (ret) | |
205 | css_free_subchannel(sch); | |
206 | return ret; | |
207 | } | |
208 | ||
b0744bd2 CH |
209 | static int |
210 | check_subchannel(struct device * dev, void * data) | |
211 | { | |
212 | struct subchannel *sch; | |
a8237fc4 | 213 | struct subchannel_id *schid = data; |
b0744bd2 CH |
214 | |
215 | sch = to_subchannel(dev); | |
a8237fc4 | 216 | return schid_equal(&sch->schid, schid); |
b0744bd2 CH |
217 | } |
218 | ||
1da177e4 | 219 | struct subchannel * |
a8237fc4 | 220 | get_subchannel_by_schid(struct subchannel_id schid) |
1da177e4 | 221 | { |
1da177e4 LT |
222 | struct device *dev; |
223 | ||
b0744bd2 | 224 | dev = bus_find_device(&css_bus_type, NULL, |
12975aef | 225 | &schid, check_subchannel); |
1da177e4 | 226 | |
b0744bd2 | 227 | return dev ? to_subchannel(dev) : NULL; |
1da177e4 LT |
228 | } |
229 | ||
4d284cac | 230 | static int css_get_subchannel_status(struct subchannel *sch) |
1da177e4 LT |
231 | { |
232 | struct schib schib; | |
1da177e4 | 233 | |
564337f3 | 234 | if (stsch(sch->schid, &schib) || !schib.pmcw.dnv) |
1da177e4 | 235 | return CIO_GONE; |
564337f3 | 236 | if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev)) |
1da177e4 | 237 | return CIO_REVALIDATE; |
564337f3 | 238 | if (!sch->lpm) |
1da177e4 LT |
239 | return CIO_NO_PATH; |
240 | return CIO_OPER; | |
241 | } | |
564337f3 PO |
242 | |
243 | static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) | |
1da177e4 LT |
244 | { |
245 | int event, ret, disc; | |
1da177e4 | 246 | unsigned long flags; |
564337f3 | 247 | enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE } action; |
1da177e4 | 248 | |
2ec22984 | 249 | spin_lock_irqsave(sch->lock, flags); |
564337f3 | 250 | disc = device_is_disconnected(sch); |
1da177e4 | 251 | if (disc && slow) { |
564337f3 | 252 | /* Disconnected devices are evaluated directly only.*/ |
2ec22984 | 253 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 254 | return 0; |
1da177e4 | 255 | } |
564337f3 PO |
256 | /* No interrupt after machine check - kill pending timers. */ |
257 | device_kill_pending_timer(sch); | |
1da177e4 | 258 | if (!disc && !slow) { |
564337f3 | 259 | /* Non-disconnected devices are evaluated on the slow path. */ |
2ec22984 | 260 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 261 | return -EAGAIN; |
1da177e4 | 262 | } |
564337f3 | 263 | event = css_get_subchannel_status(sch); |
fb6958a5 | 264 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n", |
564337f3 PO |
265 | sch->schid.ssid, sch->schid.sch_no, event, |
266 | disc ? "disconnected" : "normal", | |
267 | slow ? "slow" : "fast"); | |
268 | /* Analyze subchannel status. */ | |
269 | action = NONE; | |
1da177e4 LT |
270 | switch (event) { |
271 | case CIO_NO_PATH: | |
564337f3 PO |
272 | if (disc) { |
273 | /* Check if paths have become available. */ | |
274 | action = REPROBE; | |
1da177e4 LT |
275 | break; |
276 | } | |
564337f3 PO |
277 | /* fall through */ |
278 | case CIO_GONE: | |
279 | /* Prevent unwanted effects when opening lock. */ | |
280 | cio_disable_subchannel(sch); | |
281 | device_set_disconnected(sch); | |
282 | /* Ask driver what to do with device. */ | |
283 | action = UNREGISTER; | |
284 | if (sch->driver && sch->driver->notify) { | |
2ec22984 | 285 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 286 | ret = sch->driver->notify(&sch->dev, event); |
2ec22984 | 287 | spin_lock_irqsave(sch->lock, flags); |
564337f3 PO |
288 | if (ret) |
289 | action = NONE; | |
1da177e4 | 290 | } |
1da177e4 LT |
291 | break; |
292 | case CIO_REVALIDATE: | |
564337f3 PO |
293 | /* Device will be removed, so no notify necessary. */ |
294 | if (disc) | |
295 | /* Reprobe because immediate unregister might block. */ | |
296 | action = REPROBE; | |
297 | else | |
298 | action = UNREGISTER_PROBE; | |
1da177e4 LT |
299 | break; |
300 | case CIO_OPER: | |
564337f3 | 301 | if (disc) |
1da177e4 | 302 | /* Get device operational again. */ |
564337f3 PO |
303 | action = REPROBE; |
304 | break; | |
305 | } | |
306 | /* Perform action. */ | |
307 | ret = 0; | |
308 | switch (action) { | |
309 | case UNREGISTER: | |
310 | case UNREGISTER_PROBE: | |
311 | /* Unregister device (will use subchannel lock). */ | |
2ec22984 | 312 | spin_unlock_irqrestore(sch->lock, flags); |
564337f3 | 313 | css_sch_device_unregister(sch); |
2ec22984 | 314 | spin_lock_irqsave(sch->lock, flags); |
564337f3 PO |
315 | |
316 | /* Reset intparm to zeroes. */ | |
317 | sch->schib.pmcw.intparm = 0; | |
318 | cio_modify(sch); | |
564337f3 PO |
319 | break; |
320 | case REPROBE: | |
321 | device_trigger_reprobe(sch); | |
1da177e4 LT |
322 | break; |
323 | default: | |
564337f3 PO |
324 | break; |
325 | } | |
2ec22984 | 326 | spin_unlock_irqrestore(sch->lock, flags); |
c2b1449b CH |
327 | /* Probe if necessary. */ |
328 | if (action == UNREGISTER_PROBE) | |
329 | ret = css_probe_device(sch->schid); | |
564337f3 PO |
330 | |
331 | return ret; | |
332 | } | |
333 | ||
334 | static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) | |
335 | { | |
336 | struct schib schib; | |
337 | ||
338 | if (!slow) { | |
339 | /* Will be done on the slow path. */ | |
340 | return -EAGAIN; | |
341 | } | |
758976f9 | 342 | if (stsch_err(schid, &schib) || !schib.pmcw.dnv) { |
564337f3 PO |
343 | /* Unusable - ignore. */ |
344 | return 0; | |
1da177e4 | 345 | } |
564337f3 PO |
346 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, unknown, " |
347 | "slow path.\n", schid.ssid, schid.sch_no, CIO_OPER); | |
348 | ||
349 | return css_probe_device(schid); | |
350 | } | |
351 | ||
83b3370c | 352 | static void css_evaluate_subchannel(struct subchannel_id schid, int slow) |
564337f3 PO |
353 | { |
354 | struct subchannel *sch; | |
355 | int ret; | |
356 | ||
357 | sch = get_subchannel_by_schid(schid); | |
358 | if (sch) { | |
359 | ret = css_evaluate_known_subchannel(sch, slow); | |
360 | put_device(&sch->dev); | |
361 | } else | |
362 | ret = css_evaluate_new_subchannel(schid, slow); | |
83b3370c PO |
363 | if (ret == -EAGAIN) |
364 | css_schedule_eval(schid); | |
1da177e4 LT |
365 | } |
366 | ||
83b3370c PO |
367 | static struct idset *slow_subchannel_set; |
368 | static spinlock_t slow_subchannel_lock; | |
369 | ||
370 | static int __init slow_subchannel_init(void) | |
1da177e4 | 371 | { |
83b3370c PO |
372 | spin_lock_init(&slow_subchannel_lock); |
373 | slow_subchannel_set = idset_sch_new(); | |
374 | if (!slow_subchannel_set) { | |
375 | printk(KERN_WARNING "cio: could not allocate slow subchannel " | |
376 | "set\n"); | |
377 | return -ENOMEM; | |
378 | } | |
379 | return 0; | |
1da177e4 LT |
380 | } |
381 | ||
83b3370c | 382 | subsys_initcall(slow_subchannel_init); |
1da177e4 | 383 | |
83b3370c | 384 | static void css_slow_path_func(struct work_struct *unused) |
1da177e4 | 385 | { |
83b3370c | 386 | struct subchannel_id schid; |
1da177e4 | 387 | |
83b3370c | 388 | CIO_TRACE_EVENT(4, "slowpath"); |
1da177e4 | 389 | spin_lock_irq(&slow_subchannel_lock); |
83b3370c PO |
390 | init_subchannel_id(&schid); |
391 | while (idset_sch_get_first(slow_subchannel_set, &schid)) { | |
392 | idset_sch_del(slow_subchannel_set, schid); | |
1da177e4 | 393 | spin_unlock_irq(&slow_subchannel_lock); |
83b3370c | 394 | css_evaluate_subchannel(schid, 1); |
1da177e4 | 395 | spin_lock_irq(&slow_subchannel_lock); |
1da177e4 LT |
396 | } |
397 | spin_unlock_irq(&slow_subchannel_lock); | |
398 | } | |
399 | ||
83b3370c | 400 | static DECLARE_WORK(slow_path_work, css_slow_path_func); |
1da177e4 LT |
401 | struct workqueue_struct *slow_path_wq; |
402 | ||
83b3370c PO |
403 | void css_schedule_eval(struct subchannel_id schid) |
404 | { | |
405 | unsigned long flags; | |
406 | ||
407 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
408 | idset_sch_add(slow_subchannel_set, schid); | |
409 | queue_work(slow_path_wq, &slow_path_work); | |
410 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
411 | } | |
412 | ||
413 | void css_schedule_eval_all(void) | |
414 | { | |
415 | unsigned long flags; | |
416 | ||
417 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
418 | idset_fill(slow_subchannel_set); | |
419 | queue_work(slow_path_wq, &slow_path_work); | |
420 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
421 | } | |
422 | ||
40154b82 PO |
423 | /* Reprobe subchannel if unregistered. */ |
424 | static int reprobe_subchannel(struct subchannel_id schid, void *data) | |
425 | { | |
426 | struct subchannel *sch; | |
427 | int ret; | |
428 | ||
429 | CIO_DEBUG(KERN_INFO, 6, "cio: reprobe 0.%x.%04x\n", | |
430 | schid.ssid, schid.sch_no); | |
431 | if (need_reprobe) | |
432 | return -EAGAIN; | |
433 | ||
434 | sch = get_subchannel_by_schid(schid); | |
435 | if (sch) { | |
436 | /* Already known. */ | |
437 | put_device(&sch->dev); | |
438 | return 0; | |
439 | } | |
440 | ||
441 | ret = css_probe_device(schid); | |
442 | switch (ret) { | |
443 | case 0: | |
444 | break; | |
445 | case -ENXIO: | |
446 | case -ENOMEM: | |
447 | /* These should abort looping */ | |
448 | break; | |
449 | default: | |
450 | ret = 0; | |
451 | } | |
452 | ||
453 | return ret; | |
454 | } | |
455 | ||
456 | /* Work function used to reprobe all unregistered subchannels. */ | |
4927b3f7 | 457 | static void reprobe_all(struct work_struct *unused) |
40154b82 PO |
458 | { |
459 | int ret; | |
460 | ||
461 | CIO_MSG_EVENT(2, "reprobe start\n"); | |
462 | ||
463 | need_reprobe = 0; | |
464 | /* Make sure initial subchannel scan is done. */ | |
465 | wait_event(ccw_device_init_wq, | |
466 | atomic_read(&ccw_device_init_count) == 0); | |
467 | ret = for_each_subchannel(reprobe_subchannel, NULL); | |
468 | ||
469 | CIO_MSG_EVENT(2, "reprobe done (rc=%d, need_reprobe=%d)\n", ret, | |
470 | need_reprobe); | |
471 | } | |
472 | ||
2b67fc46 | 473 | static DECLARE_WORK(css_reprobe_work, reprobe_all); |
40154b82 PO |
474 | |
475 | /* Schedule reprobing of all unregistered subchannels. */ | |
476 | void css_schedule_reprobe(void) | |
477 | { | |
478 | need_reprobe = 1; | |
479 | queue_work(ccw_device_work, &css_reprobe_work); | |
480 | } | |
481 | ||
482 | EXPORT_SYMBOL_GPL(css_schedule_reprobe); | |
483 | ||
1da177e4 LT |
484 | /* |
485 | * Called from the machine check handler for subchannel report words. | |
486 | */ | |
83b3370c | 487 | void css_process_crw(int rsid1, int rsid2) |
1da177e4 | 488 | { |
a8237fc4 | 489 | struct subchannel_id mchk_schid; |
1da177e4 | 490 | |
fb6958a5 CH |
491 | CIO_CRW_EVENT(2, "source is subchannel %04X, subsystem id %x\n", |
492 | rsid1, rsid2); | |
a8237fc4 | 493 | init_subchannel_id(&mchk_schid); |
fb6958a5 CH |
494 | mchk_schid.sch_no = rsid1; |
495 | if (rsid2 != 0) | |
496 | mchk_schid.ssid = (rsid2 >> 8) & 3; | |
497 | ||
1da177e4 LT |
498 | /* |
499 | * Since we are always presented with IPI in the CRW, we have to | |
500 | * use stsch() to find out if the subchannel in question has come | |
501 | * or gone. | |
502 | */ | |
83b3370c | 503 | css_evaluate_subchannel(mchk_schid, 0); |
1da177e4 LT |
504 | } |
505 | ||
f97a56fb CH |
506 | static int __init |
507 | __init_channel_subsystem(struct subchannel_id schid, void *data) | |
508 | { | |
509 | struct subchannel *sch; | |
510 | int ret; | |
511 | ||
512 | if (cio_is_console(schid)) | |
513 | sch = cio_get_console_subchannel(); | |
514 | else { | |
515 | sch = css_alloc_subchannel(schid); | |
516 | if (IS_ERR(sch)) | |
517 | ret = PTR_ERR(sch); | |
518 | else | |
519 | ret = 0; | |
520 | switch (ret) { | |
521 | case 0: | |
522 | break; | |
523 | case -ENOMEM: | |
524 | panic("Out of memory in init_channel_subsystem\n"); | |
525 | /* -ENXIO: no more subchannels. */ | |
526 | case -ENXIO: | |
527 | return ret; | |
e843e280 GS |
528 | /* -EIO: this subchannel set not supported. */ |
529 | case -EIO: | |
530 | return ret; | |
f97a56fb CH |
531 | default: |
532 | return 0; | |
533 | } | |
534 | } | |
535 | /* | |
536 | * We register ALL valid subchannels in ioinfo, even those | |
537 | * that have been present before init_channel_subsystem. | |
538 | * These subchannels can't have been registered yet (kmalloc | |
539 | * not working) so we do it now. This is true e.g. for the | |
540 | * console subchannel. | |
541 | */ | |
542 | css_register_subchannel(sch); | |
543 | return 0; | |
544 | } | |
545 | ||
1da177e4 | 546 | static void __init |
a28c6944 | 547 | css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
1da177e4 | 548 | { |
a28c6944 CH |
549 | if (css_characteristics_avail && css_general_characteristics.mcss) { |
550 | css->global_pgid.pgid_high.ext_cssid.version = 0x80; | |
551 | css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; | |
552 | } else { | |
1da177e4 | 553 | #ifdef CONFIG_SMP |
a28c6944 | 554 | css->global_pgid.pgid_high.cpu_addr = hard_smp_processor_id(); |
1da177e4 | 555 | #else |
a28c6944 | 556 | css->global_pgid.pgid_high.cpu_addr = 0; |
1da177e4 LT |
557 | #endif |
558 | } | |
a28c6944 CH |
559 | css->global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident; |
560 | css->global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine; | |
561 | css->global_pgid.tod_high = tod_high; | |
562 | ||
563 | } | |
564 | ||
3b793060 CH |
565 | static void |
566 | channel_subsystem_release(struct device *dev) | |
567 | { | |
568 | struct channel_subsystem *css; | |
569 | ||
570 | css = to_css(dev); | |
495a5b45 | 571 | mutex_destroy(&css->mutex); |
3b793060 CH |
572 | kfree(css); |
573 | } | |
574 | ||
495a5b45 CH |
575 | static ssize_t |
576 | css_cm_enable_show(struct device *dev, struct device_attribute *attr, | |
577 | char *buf) | |
578 | { | |
579 | struct channel_subsystem *css = to_css(dev); | |
580 | ||
581 | if (!css) | |
582 | return 0; | |
583 | return sprintf(buf, "%x\n", css->cm_enabled); | |
584 | } | |
585 | ||
586 | static ssize_t | |
587 | css_cm_enable_store(struct device *dev, struct device_attribute *attr, | |
588 | const char *buf, size_t count) | |
589 | { | |
590 | struct channel_subsystem *css = to_css(dev); | |
591 | int ret; | |
592 | ||
593 | switch (buf[0]) { | |
594 | case '0': | |
595 | ret = css->cm_enabled ? chsc_secm(css, 0) : 0; | |
596 | break; | |
597 | case '1': | |
598 | ret = css->cm_enabled ? 0 : chsc_secm(css, 1); | |
599 | break; | |
600 | default: | |
601 | ret = -EINVAL; | |
602 | } | |
603 | return ret < 0 ? ret : count; | |
604 | } | |
605 | ||
606 | static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); | |
607 | ||
4d284cac | 608 | static int __init setup_css(int nr) |
a28c6944 CH |
609 | { |
610 | u32 tod_high; | |
d7b5a4c9 | 611 | int ret; |
a28c6944 CH |
612 | |
613 | memset(css[nr], 0, sizeof(struct channel_subsystem)); | |
d7b5a4c9 CH |
614 | css[nr]->pseudo_subchannel = |
615 | kzalloc(sizeof(*css[nr]->pseudo_subchannel), GFP_KERNEL); | |
616 | if (!css[nr]->pseudo_subchannel) | |
617 | return -ENOMEM; | |
618 | css[nr]->pseudo_subchannel->dev.parent = &css[nr]->device; | |
619 | css[nr]->pseudo_subchannel->dev.release = css_subchannel_release; | |
620 | sprintf(css[nr]->pseudo_subchannel->dev.bus_id, "defunct"); | |
621 | ret = cio_create_sch_lock(css[nr]->pseudo_subchannel); | |
622 | if (ret) { | |
623 | kfree(css[nr]->pseudo_subchannel); | |
624 | return ret; | |
625 | } | |
495a5b45 | 626 | mutex_init(&css[nr]->mutex); |
a28c6944 CH |
627 | css[nr]->valid = 1; |
628 | css[nr]->cssid = nr; | |
629 | sprintf(css[nr]->device.bus_id, "css%x", nr); | |
3b793060 | 630 | css[nr]->device.release = channel_subsystem_release; |
a28c6944 CH |
631 | tod_high = (u32) (get_clock() >> 32); |
632 | css_generate_pgid(css[nr], tod_high); | |
d7b5a4c9 | 633 | return 0; |
1da177e4 LT |
634 | } |
635 | ||
636 | /* | |
637 | * Now that the driver core is running, we can setup our channel subsystem. | |
638 | * The struct subchannel's are created during probing (except for the | |
639 | * static console subchannel). | |
640 | */ | |
641 | static int __init | |
642 | init_channel_subsystem (void) | |
643 | { | |
a28c6944 | 644 | int ret, i; |
1da177e4 LT |
645 | |
646 | if (chsc_determine_css_characteristics() == 0) | |
647 | css_characteristics_avail = 1; | |
648 | ||
1da177e4 LT |
649 | if ((ret = bus_register(&css_bus_type))) |
650 | goto out; | |
1da177e4 | 651 | |
fb6958a5 CH |
652 | /* Try to enable MSS. */ |
653 | ret = chsc_enable_facility(CHSC_SDA_OC_MSS); | |
654 | switch (ret) { | |
655 | case 0: /* Success. */ | |
656 | max_ssid = __MAX_SSID; | |
657 | break; | |
658 | case -ENOMEM: | |
659 | goto out_bus; | |
660 | default: | |
661 | max_ssid = 0; | |
662 | } | |
a28c6944 CH |
663 | /* Setup css structure. */ |
664 | for (i = 0; i <= __MAX_CSSID; i++) { | |
665 | css[i] = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL); | |
666 | if (!css[i]) { | |
667 | ret = -ENOMEM; | |
fb6958a5 | 668 | goto out_unregister; |
a28c6944 | 669 | } |
d7b5a4c9 | 670 | ret = setup_css(i); |
a28c6944 CH |
671 | if (ret) |
672 | goto out_free; | |
d7b5a4c9 CH |
673 | ret = device_register(&css[i]->device); |
674 | if (ret) | |
675 | goto out_free_all; | |
7e560814 CH |
676 | if (css_characteristics_avail && |
677 | css_chsc_characteristics.secm) { | |
678 | ret = device_create_file(&css[i]->device, | |
679 | &dev_attr_cm_enable); | |
680 | if (ret) | |
681 | goto out_device; | |
682 | } | |
d7b5a4c9 CH |
683 | ret = device_register(&css[i]->pseudo_subchannel->dev); |
684 | if (ret) | |
685 | goto out_file; | |
a28c6944 | 686 | } |
1da177e4 LT |
687 | css_init_done = 1; |
688 | ||
689 | ctl_set_bit(6, 28); | |
690 | ||
f97a56fb | 691 | for_each_subchannel(__init_channel_subsystem, NULL); |
1da177e4 | 692 | return 0; |
d7b5a4c9 CH |
693 | out_file: |
694 | device_remove_file(&css[i]->device, &dev_attr_cm_enable); | |
7e560814 CH |
695 | out_device: |
696 | device_unregister(&css[i]->device); | |
d7b5a4c9 CH |
697 | out_free_all: |
698 | kfree(css[i]->pseudo_subchannel->lock); | |
699 | kfree(css[i]->pseudo_subchannel); | |
a28c6944 CH |
700 | out_free: |
701 | kfree(css[i]); | |
fb6958a5 | 702 | out_unregister: |
a28c6944 CH |
703 | while (i > 0) { |
704 | i--; | |
d7b5a4c9 | 705 | device_unregister(&css[i]->pseudo_subchannel->dev); |
495a5b45 CH |
706 | if (css_characteristics_avail && css_chsc_characteristics.secm) |
707 | device_remove_file(&css[i]->device, | |
708 | &dev_attr_cm_enable); | |
a28c6944 CH |
709 | device_unregister(&css[i]->device); |
710 | } | |
fb6958a5 | 711 | out_bus: |
1da177e4 LT |
712 | bus_unregister(&css_bus_type); |
713 | out: | |
714 | return ret; | |
715 | } | |
716 | ||
d7b5a4c9 CH |
717 | int sch_is_pseudo_sch(struct subchannel *sch) |
718 | { | |
719 | return sch == to_css(sch->dev.parent)->pseudo_subchannel; | |
720 | } | |
721 | ||
1da177e4 LT |
722 | /* |
723 | * find a driver for a subchannel. They identify by the subchannel | |
724 | * type with the exception that the console subchannel driver has its own | |
725 | * subchannel type although the device is an i/o subchannel | |
726 | */ | |
727 | static int | |
728 | css_bus_match (struct device *dev, struct device_driver *drv) | |
729 | { | |
730 | struct subchannel *sch = container_of (dev, struct subchannel, dev); | |
731 | struct css_driver *driver = container_of (drv, struct css_driver, drv); | |
732 | ||
733 | if (sch->st == driver->subchannel_type) | |
734 | return 1; | |
735 | ||
736 | return 0; | |
737 | } | |
738 | ||
8bbace7e CH |
739 | static int |
740 | css_probe (struct device *dev) | |
741 | { | |
742 | struct subchannel *sch; | |
743 | ||
744 | sch = to_subchannel(dev); | |
745 | sch->driver = container_of (dev->driver, struct css_driver, drv); | |
746 | return (sch->driver->probe ? sch->driver->probe(sch) : 0); | |
747 | } | |
748 | ||
749 | static int | |
750 | css_remove (struct device *dev) | |
751 | { | |
752 | struct subchannel *sch; | |
753 | ||
754 | sch = to_subchannel(dev); | |
755 | return (sch->driver->remove ? sch->driver->remove(sch) : 0); | |
756 | } | |
757 | ||
758 | static void | |
759 | css_shutdown (struct device *dev) | |
760 | { | |
761 | struct subchannel *sch; | |
762 | ||
763 | sch = to_subchannel(dev); | |
764 | if (sch->driver->shutdown) | |
765 | sch->driver->shutdown(sch); | |
766 | } | |
767 | ||
1da177e4 | 768 | struct bus_type css_bus_type = { |
8bbace7e CH |
769 | .name = "css", |
770 | .match = css_bus_match, | |
771 | .probe = css_probe, | |
772 | .remove = css_remove, | |
773 | .shutdown = css_shutdown, | |
1da177e4 LT |
774 | }; |
775 | ||
776 | subsys_initcall(init_channel_subsystem); | |
777 | ||
1da177e4 LT |
778 | MODULE_LICENSE("GPL"); |
779 | EXPORT_SYMBOL(css_bus_type); | |
1da177e4 | 780 | EXPORT_SYMBOL_GPL(css_characteristics_avail); |