1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Driver for s390 chsc subchannels
4 *
5 * Copyright IBM Corp. 2008, 2011
6 *
7 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
8 *
9 */
10
11 #include <linux/slab.h>
12 #include <linux/compat.h>
13 #include <linux/device.h>
14 #include <linux/io.h>
15 #include <linux/module.h>
16 #include <linux/uaccess.h>
17 #include <linux/miscdevice.h>
18 #include <linux/kernel_stat.h>
19
20 #include <asm/cio.h>
21 #include <asm/chsc.h>
22 #include <asm/isc.h>
23
24 #include "cio.h"
25 #include "cio_debug.h"
26 #include "css.h"
27 #include "chsc_sch.h"
28 #include "ioasm.h"
29
30 static debug_info_t *chsc_debug_msg_id;
31 static debug_info_t *chsc_debug_log_id;
32
33 static struct chsc_request *on_close_request;
34 static struct chsc_async_area *on_close_chsc_area;
35 static DEFINE_MUTEX(on_close_mutex);
36
37 #define CHSC_MSG(imp, args...) do { \
38 debug_sprintf_event(chsc_debug_msg_id, imp , ##args); \
39 } while (0)
40
41 #define CHSC_LOG(imp, txt) do { \
42 debug_text_event(chsc_debug_log_id, imp , txt); \
43 } while (0)
44
CHSC_LOG_HEX(int level,void * data,int length)45 static void CHSC_LOG_HEX(int level, void *data, int length)
46 {
47 debug_event(chsc_debug_log_id, level, data, length);
48 }
49
50 MODULE_AUTHOR("IBM Corporation");
51 MODULE_DESCRIPTION("driver for s390 chsc subchannels");
52 MODULE_LICENSE("GPL");
53
chsc_subchannel_irq(struct subchannel * sch)54 static void chsc_subchannel_irq(struct subchannel *sch)
55 {
56 struct chsc_private *private = dev_get_drvdata(&sch->dev);
57 struct chsc_request *request = private->request;
58 struct irb *irb = this_cpu_ptr(&cio_irb);
59
60 CHSC_LOG(4, "irb");
61 CHSC_LOG_HEX(4, irb, sizeof(*irb));
62 inc_irq_stat(IRQIO_CSC);
63
64 /* Copy irb to provided request and set done. */
65 if (!request) {
66 CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n",
67 sch->schid.ssid, sch->schid.sch_no);
68 return;
69 }
70 private->request = NULL;
71 memcpy(&request->irb, irb, sizeof(*irb));
72 cio_update_schib(sch);
73 complete(&request->completion);
74 put_device(&sch->dev);
75 }
76
chsc_subchannel_probe(struct subchannel * sch)77 static int chsc_subchannel_probe(struct subchannel *sch)
78 {
79 struct chsc_private *private;
80 int ret;
81
82 CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n",
83 sch->schid.ssid, sch->schid.sch_no);
84 sch->isc = CHSC_SCH_ISC;
85 private = kzalloc(sizeof(*private), GFP_KERNEL);
86 if (!private)
87 return -ENOMEM;
88 dev_set_drvdata(&sch->dev, private);
89 ret = cio_enable_subchannel(sch, (u32)virt_to_phys(sch));
90 if (ret) {
91 CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
92 sch->schid.ssid, sch->schid.sch_no, ret);
93 dev_set_drvdata(&sch->dev, NULL);
94 kfree(private);
95 }
96 return ret;
97 }
98
chsc_subchannel_remove(struct subchannel * sch)99 static void chsc_subchannel_remove(struct subchannel *sch)
100 {
101 struct chsc_private *private;
102
103 cio_disable_subchannel(sch);
104 private = dev_get_drvdata(&sch->dev);
105 dev_set_drvdata(&sch->dev, NULL);
106 if (private->request) {
107 complete(&private->request->completion);
108 put_device(&sch->dev);
109 }
110 kfree(private);
111 }
112
chsc_subchannel_shutdown(struct subchannel * sch)113 static void chsc_subchannel_shutdown(struct subchannel *sch)
114 {
115 cio_disable_subchannel(sch);
116 }
117
118 static struct css_device_id chsc_subchannel_ids[] = {
119 { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
120 { /* end of list */ },
121 };
122 MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
123
124 static struct css_driver chsc_subchannel_driver = {
125 .drv = {
126 .owner = THIS_MODULE,
127 .name = "chsc_subchannel",
128 },
129 .subchannel_type = chsc_subchannel_ids,
130 .irq = chsc_subchannel_irq,
131 .probe = chsc_subchannel_probe,
132 .remove = chsc_subchannel_remove,
133 .shutdown = chsc_subchannel_shutdown,
134 };
135
chsc_init_dbfs(void)136 static int __init chsc_init_dbfs(void)
137 {
138 chsc_debug_msg_id = debug_register("chsc_msg", 8, 1, 4 * sizeof(long));
139 if (!chsc_debug_msg_id)
140 goto out;
141 debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
142 debug_set_level(chsc_debug_msg_id, 2);
143 chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
144 if (!chsc_debug_log_id)
145 goto out;
146 debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
147 debug_set_level(chsc_debug_log_id, 2);
148 return 0;
149 out:
150 debug_unregister(chsc_debug_msg_id);
151 return -ENOMEM;
152 }
153
chsc_remove_dbfs(void)154 static void chsc_remove_dbfs(void)
155 {
156 debug_unregister(chsc_debug_log_id);
157 debug_unregister(chsc_debug_msg_id);
158 }
159
chsc_init_sch_driver(void)160 static int __init chsc_init_sch_driver(void)
161 {
162 return css_driver_register(&chsc_subchannel_driver);
163 }
164
chsc_cleanup_sch_driver(void)165 static void chsc_cleanup_sch_driver(void)
166 {
167 css_driver_unregister(&chsc_subchannel_driver);
168 }
169
170 static DEFINE_SPINLOCK(chsc_lock);
171
chsc_subchannel_match_next_free(struct device * dev,const void * data)172 static int chsc_subchannel_match_next_free(struct device *dev, const void *data)
173 {
174 struct subchannel *sch = to_subchannel(dev);
175
176 return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
177 }
178
chsc_get_next_subchannel(struct subchannel * sch)179 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
180 {
181 struct device *dev;
182
183 dev = driver_find_device(&chsc_subchannel_driver.drv,
184 sch ? &sch->dev : NULL, NULL,
185 chsc_subchannel_match_next_free);
186 return dev ? to_subchannel(dev) : NULL;
187 }
188
189 /**
190 * chsc_async() - try to start a chsc request asynchronously
191 * @chsc_area: request to be started
192 * @request: request structure to associate
193 *
194 * Tries to start a chsc request on one of the existing chsc subchannels.
195 * Returns:
196 * %0 if the request was performed synchronously
197 * %-EINPROGRESS if the request was successfully started
198 * %-EBUSY if all chsc subchannels are busy
199 * %-ENODEV if no chsc subchannels are available
200 * Context:
201 * interrupts disabled, chsc_lock held
202 */
chsc_async(struct chsc_async_area * chsc_area,struct chsc_request * request)203 static int chsc_async(struct chsc_async_area *chsc_area,
204 struct chsc_request *request)
205 {
206 int cc;
207 struct chsc_private *private;
208 struct subchannel *sch = NULL;
209 int ret = -ENODEV;
210 char dbf[10];
211
212 chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
213 while ((sch = chsc_get_next_subchannel(sch))) {
214 spin_lock(&sch->lock);
215 private = dev_get_drvdata(&sch->dev);
216 if (private->request) {
217 spin_unlock(&sch->lock);
218 ret = -EBUSY;
219 continue;
220 }
221 chsc_area->header.sid = sch->schid;
222 CHSC_LOG(2, "schid");
223 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
224 cc = chsc(chsc_area);
225 snprintf(dbf, sizeof(dbf), "cc:%d", cc);
226 CHSC_LOG(2, dbf);
227 switch (cc) {
228 case 0:
229 ret = 0;
230 break;
231 case 1:
232 sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
233 ret = -EINPROGRESS;
234 private->request = request;
235 break;
236 case 2:
237 ret = -EBUSY;
238 break;
239 default:
240 ret = -ENODEV;
241 }
242 spin_unlock(&sch->lock);
243 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
244 sch->schid.ssid, sch->schid.sch_no, cc);
245 if (ret == -EINPROGRESS)
246 return -EINPROGRESS;
247 put_device(&sch->dev);
248 if (ret == 0)
249 return 0;
250 }
251 return ret;
252 }
253
chsc_log_command(void * chsc_area)254 static void chsc_log_command(void *chsc_area)
255 {
256 char dbf[10];
257
258 snprintf(dbf, sizeof(dbf), "CHSC:%x", ((uint16_t *)chsc_area)[1]);
259 CHSC_LOG(0, dbf);
260 CHSC_LOG_HEX(0, chsc_area, 32);
261 }
262
chsc_examine_irb(struct chsc_request * request)263 static int chsc_examine_irb(struct chsc_request *request)
264 {
265 int backed_up;
266
267 if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
268 return -EIO;
269 backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
270 request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
271 if (scsw_cstat(&request->irb.scsw) == 0)
272 return 0;
273 if (!backed_up)
274 return 0;
275 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
276 return -EIO;
277 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
278 return -EPERM;
279 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
280 return -EAGAIN;
281 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
282 return -EAGAIN;
283 return -EIO;
284 }
285
chsc_ioctl_start(void __user * user_area)286 static int chsc_ioctl_start(void __user *user_area)
287 {
288 struct chsc_request *request;
289 struct chsc_async_area *chsc_area;
290 int ret;
291 char dbf[10];
292
293 if (!css_general_characteristics.dynio)
294 /* It makes no sense to try. */
295 return -EOPNOTSUPP;
296 chsc_area = (void *)get_zeroed_page(GFP_KERNEL);
297 if (!chsc_area)
298 return -ENOMEM;
299 request = kzalloc(sizeof(*request), GFP_KERNEL);
300 if (!request) {
301 ret = -ENOMEM;
302 goto out_free;
303 }
304 init_completion(&request->completion);
305 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
306 ret = -EFAULT;
307 goto out_free;
308 }
309 chsc_log_command(chsc_area);
310 spin_lock_irq(&chsc_lock);
311 ret = chsc_async(chsc_area, request);
312 spin_unlock_irq(&chsc_lock);
313 if (ret == -EINPROGRESS) {
314 wait_for_completion(&request->completion);
315 ret = chsc_examine_irb(request);
316 }
317 /* copy area back to user */
318 if (!ret)
319 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
320 ret = -EFAULT;
321 out_free:
322 snprintf(dbf, sizeof(dbf), "ret:%d", ret);
323 CHSC_LOG(0, dbf);
324 kfree(request);
325 free_page((unsigned long)chsc_area);
326 return ret;
327 }
328
chsc_ioctl_on_close_set(void __user * user_area)329 static int chsc_ioctl_on_close_set(void __user *user_area)
330 {
331 char dbf[13];
332 int ret;
333
334 mutex_lock(&on_close_mutex);
335 if (on_close_chsc_area) {
336 ret = -EBUSY;
337 goto out_unlock;
338 }
339 on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL);
340 if (!on_close_request) {
341 ret = -ENOMEM;
342 goto out_unlock;
343 }
344 on_close_chsc_area = (void *)get_zeroed_page(GFP_KERNEL);
345 if (!on_close_chsc_area) {
346 ret = -ENOMEM;
347 goto out_free_request;
348 }
349 if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) {
350 ret = -EFAULT;
351 goto out_free_chsc;
352 }
353 ret = 0;
354 goto out_unlock;
355
356 out_free_chsc:
357 free_page((unsigned long)on_close_chsc_area);
358 on_close_chsc_area = NULL;
359 out_free_request:
360 kfree(on_close_request);
361 on_close_request = NULL;
362 out_unlock:
363 mutex_unlock(&on_close_mutex);
364 snprintf(dbf, sizeof(dbf), "ocsret:%d", ret);
365 CHSC_LOG(0, dbf);
366 return ret;
367 }
368
chsc_ioctl_on_close_remove(void)369 static int chsc_ioctl_on_close_remove(void)
370 {
371 char dbf[13];
372 int ret;
373
374 mutex_lock(&on_close_mutex);
375 if (!on_close_chsc_area) {
376 ret = -ENOENT;
377 goto out_unlock;
378 }
379 free_page((unsigned long)on_close_chsc_area);
380 on_close_chsc_area = NULL;
381 kfree(on_close_request);
382 on_close_request = NULL;
383 ret = 0;
384 out_unlock:
385 mutex_unlock(&on_close_mutex);
386 snprintf(dbf, sizeof(dbf), "ocrret:%d", ret);
387 CHSC_LOG(0, dbf);
388 return ret;
389 }
390
chsc_ioctl_start_sync(void __user * user_area)391 static int chsc_ioctl_start_sync(void __user *user_area)
392 {
393 struct chsc_sync_area *chsc_area;
394 int ret, ccode;
395
396 chsc_area = (void *)get_zeroed_page(GFP_KERNEL);
397 if (!chsc_area)
398 return -ENOMEM;
399 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
400 ret = -EFAULT;
401 goto out_free;
402 }
403 if (chsc_area->header.code & 0x4000) {
404 ret = -EINVAL;
405 goto out_free;
406 }
407 chsc_log_command(chsc_area);
408 ccode = chsc(chsc_area);
409 if (ccode != 0) {
410 ret = -EIO;
411 goto out_free;
412 }
413 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
414 ret = -EFAULT;
415 else
416 ret = 0;
417 out_free:
418 free_page((unsigned long)chsc_area);
419 return ret;
420 }
421
chsc_ioctl_info_channel_path(void __user * user_cd)422 static int chsc_ioctl_info_channel_path(void __user *user_cd)
423 {
424 struct chsc_chp_cd *cd;
425 int ret, ccode;
426 struct {
427 struct chsc_header request;
428 u32 : 2;
429 u32 m : 1;
430 u32 : 1;
431 u32 fmt1 : 4;
432 u32 cssid : 8;
433 u32 : 8;
434 u32 first_chpid : 8;
435 u32 : 24;
436 u32 last_chpid : 8;
437 u32 : 32;
438 struct chsc_header response;
439 u8 data[PAGE_SIZE - 20];
440 } __attribute__ ((packed)) *scpcd_area;
441
442 scpcd_area = (void *)get_zeroed_page(GFP_KERNEL);
443 if (!scpcd_area)
444 return -ENOMEM;
445 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
446 if (!cd) {
447 ret = -ENOMEM;
448 goto out_free;
449 }
450 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
451 ret = -EFAULT;
452 goto out_free;
453 }
454 scpcd_area->request.length = 0x0010;
455 scpcd_area->request.code = 0x0028;
456 scpcd_area->m = cd->m;
457 scpcd_area->fmt1 = cd->fmt;
458 scpcd_area->cssid = cd->chpid.cssid;
459 scpcd_area->first_chpid = cd->chpid.id;
460 scpcd_area->last_chpid = cd->chpid.id;
461
462 ccode = chsc(scpcd_area);
463 if (ccode != 0) {
464 ret = -EIO;
465 goto out_free;
466 }
467 if (scpcd_area->response.code != 0x0001) {
468 ret = -EIO;
469 CHSC_MSG(0, "scpcd: response code=%x\n",
470 scpcd_area->response.code);
471 goto out_free;
472 }
473 memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
474 if (copy_to_user(user_cd, cd, sizeof(*cd)))
475 ret = -EFAULT;
476 else
477 ret = 0;
478 out_free:
479 kfree(cd);
480 free_page((unsigned long)scpcd_area);
481 return ret;
482 }
483
chsc_ioctl_info_cu(void __user * user_cd)484 static int chsc_ioctl_info_cu(void __user *user_cd)
485 {
486 struct chsc_cu_cd *cd;
487 int ret, ccode;
488 struct {
489 struct chsc_header request;
490 u32 : 2;
491 u32 m : 1;
492 u32 : 1;
493 u32 fmt1 : 4;
494 u32 cssid : 8;
495 u32 : 8;
496 u32 first_cun : 8;
497 u32 : 24;
498 u32 last_cun : 8;
499 u32 : 32;
500 struct chsc_header response;
501 u8 data[PAGE_SIZE - 20];
502 } __attribute__ ((packed)) *scucd_area;
503
504 scucd_area = (void *)get_zeroed_page(GFP_KERNEL);
505 if (!scucd_area)
506 return -ENOMEM;
507 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
508 if (!cd) {
509 ret = -ENOMEM;
510 goto out_free;
511 }
512 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
513 ret = -EFAULT;
514 goto out_free;
515 }
516 scucd_area->request.length = 0x0010;
517 scucd_area->request.code = 0x0026;
518 scucd_area->m = cd->m;
519 scucd_area->fmt1 = cd->fmt;
520 scucd_area->cssid = cd->cssid;
521 scucd_area->first_cun = cd->cun;
522 scucd_area->last_cun = cd->cun;
523
524 ccode = chsc(scucd_area);
525 if (ccode != 0) {
526 ret = -EIO;
527 goto out_free;
528 }
529 if (scucd_area->response.code != 0x0001) {
530 ret = -EIO;
531 CHSC_MSG(0, "scucd: response code=%x\n",
532 scucd_area->response.code);
533 goto out_free;
534 }
535 memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
536 if (copy_to_user(user_cd, cd, sizeof(*cd)))
537 ret = -EFAULT;
538 else
539 ret = 0;
540 out_free:
541 kfree(cd);
542 free_page((unsigned long)scucd_area);
543 return ret;
544 }
545
chsc_ioctl_info_sch_cu(void __user * user_cud)546 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
547 {
548 struct chsc_sch_cud *cud;
549 int ret, ccode;
550 struct {
551 struct chsc_header request;
552 u32 : 2;
553 u32 m : 1;
554 u32 : 5;
555 u32 fmt1 : 4;
556 u32 : 2;
557 u32 ssid : 2;
558 u32 first_sch : 16;
559 u32 : 8;
560 u32 cssid : 8;
561 u32 last_sch : 16;
562 u32 : 32;
563 struct chsc_header response;
564 u8 data[PAGE_SIZE - 20];
565 } __attribute__ ((packed)) *sscud_area;
566
567 sscud_area = (void *)get_zeroed_page(GFP_KERNEL);
568 if (!sscud_area)
569 return -ENOMEM;
570 cud = kzalloc(sizeof(*cud), GFP_KERNEL);
571 if (!cud) {
572 ret = -ENOMEM;
573 goto out_free;
574 }
575 if (copy_from_user(cud, user_cud, sizeof(*cud))) {
576 ret = -EFAULT;
577 goto out_free;
578 }
579 sscud_area->request.length = 0x0010;
580 sscud_area->request.code = 0x0006;
581 sscud_area->m = cud->schid.m;
582 sscud_area->fmt1 = cud->fmt;
583 sscud_area->ssid = cud->schid.ssid;
584 sscud_area->first_sch = cud->schid.sch_no;
585 sscud_area->cssid = cud->schid.cssid;
586 sscud_area->last_sch = cud->schid.sch_no;
587
588 ccode = chsc(sscud_area);
589 if (ccode != 0) {
590 ret = -EIO;
591 goto out_free;
592 }
593 if (sscud_area->response.code != 0x0001) {
594 ret = -EIO;
595 CHSC_MSG(0, "sscud: response code=%x\n",
596 sscud_area->response.code);
597 goto out_free;
598 }
599 memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
600 if (copy_to_user(user_cud, cud, sizeof(*cud)))
601 ret = -EFAULT;
602 else
603 ret = 0;
604 out_free:
605 kfree(cud);
606 free_page((unsigned long)sscud_area);
607 return ret;
608 }
609
chsc_ioctl_conf_info(void __user * user_ci)610 static int chsc_ioctl_conf_info(void __user *user_ci)
611 {
612 struct chsc_conf_info *ci;
613 int ret, ccode;
614 struct {
615 struct chsc_header request;
616 u32 : 2;
617 u32 m : 1;
618 u32 : 1;
619 u32 fmt1 : 4;
620 u32 cssid : 8;
621 u32 : 6;
622 u32 ssid : 2;
623 u32 : 8;
624 u64 : 64;
625 struct chsc_header response;
626 u8 data[PAGE_SIZE - 20];
627 } __attribute__ ((packed)) *sci_area;
628
629 sci_area = (void *)get_zeroed_page(GFP_KERNEL);
630 if (!sci_area)
631 return -ENOMEM;
632 ci = kzalloc(sizeof(*ci), GFP_KERNEL);
633 if (!ci) {
634 ret = -ENOMEM;
635 goto out_free;
636 }
637 if (copy_from_user(ci, user_ci, sizeof(*ci))) {
638 ret = -EFAULT;
639 goto out_free;
640 }
641 sci_area->request.length = 0x0010;
642 sci_area->request.code = 0x0012;
643 sci_area->m = ci->id.m;
644 sci_area->fmt1 = ci->fmt;
645 sci_area->cssid = ci->id.cssid;
646 sci_area->ssid = ci->id.ssid;
647
648 ccode = chsc(sci_area);
649 if (ccode != 0) {
650 ret = -EIO;
651 goto out_free;
652 }
653 if (sci_area->response.code != 0x0001) {
654 ret = -EIO;
655 CHSC_MSG(0, "sci: response code=%x\n",
656 sci_area->response.code);
657 goto out_free;
658 }
659 memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
660 if (copy_to_user(user_ci, ci, sizeof(*ci)))
661 ret = -EFAULT;
662 else
663 ret = 0;
664 out_free:
665 kfree(ci);
666 free_page((unsigned long)sci_area);
667 return ret;
668 }
669
chsc_ioctl_conf_comp_list(void __user * user_ccl)670 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
671 {
672 struct chsc_comp_list *ccl;
673 int ret, ccode;
674 struct {
675 struct chsc_header request;
676 u32 ctype : 8;
677 u32 : 4;
678 u32 fmt : 4;
679 u32 : 16;
680 u64 : 64;
681 u32 list_parm[2];
682 u64 : 64;
683 struct chsc_header response;
684 u8 data[PAGE_SIZE - 36];
685 } __attribute__ ((packed)) *sccl_area;
686 struct {
687 u32 m : 1;
688 u32 : 31;
689 u32 cssid : 8;
690 u32 : 16;
691 u32 chpid : 8;
692 } __attribute__ ((packed)) *chpid_parm;
693 struct {
694 u32 f_cssid : 8;
695 u32 l_cssid : 8;
696 u32 : 16;
697 u32 res;
698 } __attribute__ ((packed)) *cssids_parm;
699
700 sccl_area = (void *)get_zeroed_page(GFP_KERNEL);
701 if (!sccl_area)
702 return -ENOMEM;
703 ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
704 if (!ccl) {
705 ret = -ENOMEM;
706 goto out_free;
707 }
708 if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
709 ret = -EFAULT;
710 goto out_free;
711 }
712 sccl_area->request.length = 0x0020;
713 sccl_area->request.code = 0x0030;
714 sccl_area->fmt = ccl->req.fmt;
715 sccl_area->ctype = ccl->req.ctype;
716 switch (sccl_area->ctype) {
717 case CCL_CU_ON_CHP:
718 case CCL_IOP_CHP:
719 chpid_parm = (void *)&sccl_area->list_parm;
720 chpid_parm->m = ccl->req.chpid.m;
721 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
722 chpid_parm->chpid = ccl->req.chpid.chp.id;
723 break;
724 case CCL_CSS_IMG:
725 case CCL_CSS_IMG_CONF_CHAR:
726 cssids_parm = (void *)&sccl_area->list_parm;
727 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
728 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
729 break;
730 }
731 ccode = chsc(sccl_area);
732 if (ccode != 0) {
733 ret = -EIO;
734 goto out_free;
735 }
736 if (sccl_area->response.code != 0x0001) {
737 ret = -EIO;
738 CHSC_MSG(0, "sccl: response code=%x\n",
739 sccl_area->response.code);
740 goto out_free;
741 }
742 memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
743 if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
744 ret = -EFAULT;
745 else
746 ret = 0;
747 out_free:
748 kfree(ccl);
749 free_page((unsigned long)sccl_area);
750 return ret;
751 }
752
chsc_ioctl_chpd(void __user * user_chpd)753 static int chsc_ioctl_chpd(void __user *user_chpd)
754 {
755 struct chsc_scpd *scpd_area;
756 struct chsc_cpd_info *chpd;
757 int ret;
758
759 chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
760 scpd_area = (void *)get_zeroed_page(GFP_KERNEL);
761 if (!scpd_area || !chpd) {
762 ret = -ENOMEM;
763 goto out_free;
764 }
765 if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
766 ret = -EFAULT;
767 goto out_free;
768 }
769 ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
770 chpd->rfmt, chpd->c, chpd->m,
771 scpd_area);
772 if (ret)
773 goto out_free;
774 memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
775 if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
776 ret = -EFAULT;
777 out_free:
778 kfree(chpd);
779 free_page((unsigned long)scpd_area);
780 return ret;
781 }
782
chsc_ioctl_dcal(void __user * user_dcal)783 static int chsc_ioctl_dcal(void __user *user_dcal)
784 {
785 struct chsc_dcal *dcal;
786 int ret, ccode;
787 struct {
788 struct chsc_header request;
789 u32 atype : 8;
790 u32 : 4;
791 u32 fmt : 4;
792 u32 : 16;
793 u32 res0[2];
794 u32 list_parm[2];
795 u32 res1[2];
796 struct chsc_header response;
797 u8 data[PAGE_SIZE - 36];
798 } __attribute__ ((packed)) *sdcal_area;
799
800 sdcal_area = (void *)get_zeroed_page(GFP_KERNEL);
801 if (!sdcal_area)
802 return -ENOMEM;
803 dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
804 if (!dcal) {
805 ret = -ENOMEM;
806 goto out_free;
807 }
808 if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
809 ret = -EFAULT;
810 goto out_free;
811 }
812 sdcal_area->request.length = 0x0020;
813 sdcal_area->request.code = 0x0034;
814 sdcal_area->atype = dcal->req.atype;
815 sdcal_area->fmt = dcal->req.fmt;
816 memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
817 sizeof(sdcal_area->list_parm));
818
819 ccode = chsc(sdcal_area);
820 if (ccode != 0) {
821 ret = -EIO;
822 goto out_free;
823 }
824 if (sdcal_area->response.code != 0x0001) {
825 ret = -EIO;
826 CHSC_MSG(0, "sdcal: response code=%x\n",
827 sdcal_area->response.code);
828 goto out_free;
829 }
830 memcpy(&dcal->sdcal, &sdcal_area->response,
831 sdcal_area->response.length);
832 if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
833 ret = -EFAULT;
834 else
835 ret = 0;
836 out_free:
837 kfree(dcal);
838 free_page((unsigned long)sdcal_area);
839 return ret;
840 }
841
chsc_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)842 static long chsc_ioctl(struct file *filp, unsigned int cmd,
843 unsigned long arg)
844 {
845 void __user *argp;
846
847 CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
848 if (is_compat_task())
849 argp = compat_ptr(arg);
850 else
851 argp = (void __user *)arg;
852 switch (cmd) {
853 case CHSC_START:
854 return chsc_ioctl_start(argp);
855 case CHSC_START_SYNC:
856 return chsc_ioctl_start_sync(argp);
857 case CHSC_INFO_CHANNEL_PATH:
858 return chsc_ioctl_info_channel_path(argp);
859 case CHSC_INFO_CU:
860 return chsc_ioctl_info_cu(argp);
861 case CHSC_INFO_SCH_CU:
862 return chsc_ioctl_info_sch_cu(argp);
863 case CHSC_INFO_CI:
864 return chsc_ioctl_conf_info(argp);
865 case CHSC_INFO_CCL:
866 return chsc_ioctl_conf_comp_list(argp);
867 case CHSC_INFO_CPD:
868 return chsc_ioctl_chpd(argp);
869 case CHSC_INFO_DCAL:
870 return chsc_ioctl_dcal(argp);
871 case CHSC_ON_CLOSE_SET:
872 return chsc_ioctl_on_close_set(argp);
873 case CHSC_ON_CLOSE_REMOVE:
874 return chsc_ioctl_on_close_remove();
875 default: /* unknown ioctl number */
876 return -ENOIOCTLCMD;
877 }
878 }
879
880 static atomic_t chsc_ready_for_use = ATOMIC_INIT(1);
881
chsc_open(struct inode * inode,struct file * file)882 static int chsc_open(struct inode *inode, struct file *file)
883 {
884 if (!atomic_dec_and_test(&chsc_ready_for_use)) {
885 atomic_inc(&chsc_ready_for_use);
886 return -EBUSY;
887 }
888 return nonseekable_open(inode, file);
889 }
890
chsc_release(struct inode * inode,struct file * filp)891 static int chsc_release(struct inode *inode, struct file *filp)
892 {
893 char dbf[13];
894 int ret;
895
896 mutex_lock(&on_close_mutex);
897 if (!on_close_chsc_area)
898 goto out_unlock;
899 init_completion(&on_close_request->completion);
900 CHSC_LOG(0, "on_close");
901 chsc_log_command(on_close_chsc_area);
902 spin_lock_irq(&chsc_lock);
903 ret = chsc_async(on_close_chsc_area, on_close_request);
904 spin_unlock_irq(&chsc_lock);
905 if (ret == -EINPROGRESS) {
906 wait_for_completion(&on_close_request->completion);
907 ret = chsc_examine_irb(on_close_request);
908 }
909 snprintf(dbf, sizeof(dbf), "relret:%d", ret);
910 CHSC_LOG(0, dbf);
911 free_page((unsigned long)on_close_chsc_area);
912 on_close_chsc_area = NULL;
913 kfree(on_close_request);
914 on_close_request = NULL;
915 out_unlock:
916 mutex_unlock(&on_close_mutex);
917 atomic_inc(&chsc_ready_for_use);
918 return 0;
919 }
920
921 static const struct file_operations chsc_fops = {
922 .owner = THIS_MODULE,
923 .open = chsc_open,
924 .release = chsc_release,
925 .unlocked_ioctl = chsc_ioctl,
926 .compat_ioctl = chsc_ioctl,
927 };
928
929 static struct miscdevice chsc_misc_device = {
930 .minor = MISC_DYNAMIC_MINOR,
931 .name = "chsc",
932 .fops = &chsc_fops,
933 };
934
chsc_misc_init(void)935 static int __init chsc_misc_init(void)
936 {
937 return misc_register(&chsc_misc_device);
938 }
939
chsc_misc_cleanup(void)940 static void chsc_misc_cleanup(void)
941 {
942 misc_deregister(&chsc_misc_device);
943 }
944
chsc_sch_init(void)945 static int __init chsc_sch_init(void)
946 {
947 int ret;
948
949 ret = chsc_init_dbfs();
950 if (ret)
951 return ret;
952 isc_register(CHSC_SCH_ISC);
953 ret = chsc_init_sch_driver();
954 if (ret)
955 goto out_dbf;
956 ret = chsc_misc_init();
957 if (ret)
958 goto out_driver;
959 return ret;
960 out_driver:
961 chsc_cleanup_sch_driver();
962 out_dbf:
963 isc_unregister(CHSC_SCH_ISC);
964 chsc_remove_dbfs();
965 return ret;
966 }
967
chsc_sch_exit(void)968 static void __exit chsc_sch_exit(void)
969 {
970 chsc_misc_cleanup();
971 chsc_cleanup_sch_driver();
972 isc_unregister(CHSC_SCH_ISC);
973 chsc_remove_dbfs();
974 }
975
976 module_init(chsc_sch_init);
977 module_exit(chsc_sch_exit);
978