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/device.h>
13 #include <linux/io.h>
14 #include <linux/module.h>
15 #include <linux/uaccess.h>
16 #include <linux/miscdevice.h>
17 #include <linux/kernel_stat.h>
18 #include <linux/cleanup.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_obj(*private);
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 = kzalloc(PAGE_SIZE, GFP_DMA | GFP_KERNEL);
297 if (!chsc_area)
298 return -ENOMEM;
299 request = kzalloc_obj(*request);
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 kfree(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_obj(*on_close_request);
340 if (!on_close_request) {
341 ret = -ENOMEM;
342 goto out_unlock;
343 }
344 on_close_chsc_area = kzalloc(PAGE_SIZE, GFP_DMA | 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 kfree(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 kfree(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 __free(kfree) = NULL;
394 int ccode;
395
396 chsc_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
397 if (!chsc_area)
398 return -ENOMEM;
399 if (copy_from_user(chsc_area, user_area, PAGE_SIZE))
400 return -EFAULT;
401 if (chsc_area->header.code & 0x4000)
402 return -EINVAL;
403 chsc_log_command(chsc_area);
404 ccode = chsc(chsc_area);
405 if (ccode != 0)
406 return -EIO;
407 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
408 return -EFAULT;
409 return 0;
410 }
411
chsc_ioctl_info_channel_path(void __user * user_cd)412 static int chsc_ioctl_info_channel_path(void __user *user_cd)
413 {
414 struct chsc_chp_cd *cd __free(kfree) = NULL;
415 int ccode;
416 struct {
417 struct chsc_header request;
418 u32 : 2;
419 u32 m : 1;
420 u32 : 1;
421 u32 fmt1 : 4;
422 u32 cssid : 8;
423 u32 : 8;
424 u32 first_chpid : 8;
425 u32 : 24;
426 u32 last_chpid : 8;
427 u32 : 32;
428 struct chsc_header response;
429 u8 data[PAGE_SIZE - 20];
430 } __attribute__ ((packed)) *scpcd_area __free(kfree) = NULL;
431
432 scpcd_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
433 if (!scpcd_area)
434 return -ENOMEM;
435 cd = kzalloc_obj(*cd);
436 if (!cd)
437 return -ENOMEM;
438 if (copy_from_user(cd, user_cd, sizeof(*cd)))
439 return -EFAULT;
440 scpcd_area->request.length = 0x0010;
441 scpcd_area->request.code = 0x0028;
442 scpcd_area->m = cd->m;
443 scpcd_area->fmt1 = cd->fmt;
444 scpcd_area->cssid = cd->chpid.cssid;
445 scpcd_area->first_chpid = cd->chpid.id;
446 scpcd_area->last_chpid = cd->chpid.id;
447
448 ccode = chsc(scpcd_area);
449 if (ccode != 0)
450 return -EIO;
451 if (scpcd_area->response.code != 0x0001) {
452 CHSC_MSG(0, "scpcd: response code=%x\n",
453 scpcd_area->response.code);
454 return -EIO;
455 }
456 memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
457 if (copy_to_user(user_cd, cd, sizeof(*cd)))
458 return -EFAULT;
459 return 0;
460 }
461
chsc_ioctl_info_cu(void __user * user_cd)462 static int chsc_ioctl_info_cu(void __user *user_cd)
463 {
464 struct chsc_cu_cd *cd __free(kfree) = NULL;
465 int ccode;
466 struct {
467 struct chsc_header request;
468 u32 : 2;
469 u32 m : 1;
470 u32 : 1;
471 u32 fmt1 : 4;
472 u32 cssid : 8;
473 u32 : 8;
474 u32 first_cun : 8;
475 u32 : 24;
476 u32 last_cun : 8;
477 u32 : 32;
478 struct chsc_header response;
479 u8 data[PAGE_SIZE - 20];
480 } __attribute__ ((packed)) *scucd_area __free(kfree) = NULL;
481
482 scucd_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
483 if (!scucd_area)
484 return -ENOMEM;
485 cd = kzalloc_obj(*cd);
486 if (!cd)
487 return -ENOMEM;
488 if (copy_from_user(cd, user_cd, sizeof(*cd)))
489 return -EFAULT;
490 scucd_area->request.length = 0x0010;
491 scucd_area->request.code = 0x0026;
492 scucd_area->m = cd->m;
493 scucd_area->fmt1 = cd->fmt;
494 scucd_area->cssid = cd->cssid;
495 scucd_area->first_cun = cd->cun;
496 scucd_area->last_cun = cd->cun;
497
498 ccode = chsc(scucd_area);
499 if (ccode != 0)
500 return -EIO;
501 if (scucd_area->response.code != 0x0001) {
502 CHSC_MSG(0, "scucd: response code=%x\n",
503 scucd_area->response.code);
504 return -EIO;
505 }
506 memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
507 if (copy_to_user(user_cd, cd, sizeof(*cd)))
508 return -EFAULT;
509 return 0;
510 }
511
chsc_ioctl_info_sch_cu(void __user * user_cud)512 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
513 {
514 struct chsc_sch_cud *cud __free(kfree) = NULL;
515 int ccode;
516 struct {
517 struct chsc_header request;
518 u32 : 2;
519 u32 m : 1;
520 u32 : 5;
521 u32 fmt1 : 4;
522 u32 : 2;
523 u32 ssid : 2;
524 u32 first_sch : 16;
525 u32 : 8;
526 u32 cssid : 8;
527 u32 last_sch : 16;
528 u32 : 32;
529 struct chsc_header response;
530 u8 data[PAGE_SIZE - 20];
531 } __attribute__ ((packed)) *sscud_area __free(kfree) = NULL;
532
533 sscud_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
534 if (!sscud_area)
535 return -ENOMEM;
536 cud = kzalloc_obj(*cud);
537 if (!cud)
538 return -ENOMEM;
539 if (copy_from_user(cud, user_cud, sizeof(*cud)))
540 return -EFAULT;
541 sscud_area->request.length = 0x0010;
542 sscud_area->request.code = 0x0006;
543 sscud_area->m = cud->schid.m;
544 sscud_area->fmt1 = cud->fmt;
545 sscud_area->ssid = cud->schid.ssid;
546 sscud_area->first_sch = cud->schid.sch_no;
547 sscud_area->cssid = cud->schid.cssid;
548 sscud_area->last_sch = cud->schid.sch_no;
549
550 ccode = chsc(sscud_area);
551 if (ccode != 0)
552 return -EIO;
553 if (sscud_area->response.code != 0x0001) {
554 CHSC_MSG(0, "sscud: response code=%x\n",
555 sscud_area->response.code);
556 return -EIO;
557 }
558 memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
559 if (copy_to_user(user_cud, cud, sizeof(*cud)))
560 return -EFAULT;
561 return 0;
562 }
563
chsc_ioctl_conf_info(void __user * user_ci)564 static int chsc_ioctl_conf_info(void __user *user_ci)
565 {
566 struct chsc_conf_info *ci __free(kfree) = NULL;
567 int ccode;
568 struct {
569 struct chsc_header request;
570 u32 : 2;
571 u32 m : 1;
572 u32 : 1;
573 u32 fmt1 : 4;
574 u32 cssid : 8;
575 u32 : 6;
576 u32 ssid : 2;
577 u32 : 8;
578 u64 : 64;
579 struct chsc_header response;
580 u8 data[PAGE_SIZE - 20];
581 } __attribute__ ((packed)) *sci_area __free(kfree) = NULL;
582
583 sci_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
584 if (!sci_area)
585 return -ENOMEM;
586 ci = kzalloc_obj(*ci);
587 if (!ci)
588 return -ENOMEM;
589 if (copy_from_user(ci, user_ci, sizeof(*ci)))
590 return -EFAULT;
591 sci_area->request.length = 0x0010;
592 sci_area->request.code = 0x0012;
593 sci_area->m = ci->id.m;
594 sci_area->fmt1 = ci->fmt;
595 sci_area->cssid = ci->id.cssid;
596 sci_area->ssid = ci->id.ssid;
597
598 ccode = chsc(sci_area);
599 if (ccode != 0)
600 return -EIO;
601 if (sci_area->response.code != 0x0001) {
602 CHSC_MSG(0, "sci: response code=%x\n",
603 sci_area->response.code);
604 return -EIO;
605 }
606 memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
607 if (copy_to_user(user_ci, ci, sizeof(*ci)))
608 return -EFAULT;
609 return 0;
610 }
611
chsc_ioctl_conf_comp_list(void __user * user_ccl)612 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
613 {
614 struct chsc_comp_list *ccl __free(kfree) = NULL;
615 int ccode;
616 struct {
617 struct chsc_header request;
618 u32 ctype : 8;
619 u32 : 4;
620 u32 fmt : 4;
621 u32 : 16;
622 u64 : 64;
623 u32 list_parm[2];
624 u64 : 64;
625 struct chsc_header response;
626 u8 data[PAGE_SIZE - 36];
627 } __attribute__ ((packed)) *sccl_area __free(kfree) = NULL;
628 struct {
629 u32 m : 1;
630 u32 : 31;
631 u32 cssid : 8;
632 u32 : 16;
633 u32 chpid : 8;
634 } __attribute__ ((packed)) *chpid_parm;
635 struct {
636 u32 f_cssid : 8;
637 u32 l_cssid : 8;
638 u32 : 16;
639 u32 res;
640 } __attribute__ ((packed)) *cssids_parm;
641
642 sccl_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
643 if (!sccl_area)
644 return -ENOMEM;
645 ccl = kzalloc_obj(*ccl);
646 if (!ccl)
647 return -ENOMEM;
648 if (copy_from_user(ccl, user_ccl, sizeof(*ccl)))
649 return -EFAULT;
650 sccl_area->request.length = 0x0020;
651 sccl_area->request.code = 0x0030;
652 sccl_area->fmt = ccl->req.fmt;
653 sccl_area->ctype = ccl->req.ctype;
654 switch (sccl_area->ctype) {
655 case CCL_CU_ON_CHP:
656 case CCL_IOP_CHP:
657 chpid_parm = (void *)&sccl_area->list_parm;
658 chpid_parm->m = ccl->req.chpid.m;
659 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
660 chpid_parm->chpid = ccl->req.chpid.chp.id;
661 break;
662 case CCL_CSS_IMG:
663 case CCL_CSS_IMG_CONF_CHAR:
664 cssids_parm = (void *)&sccl_area->list_parm;
665 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
666 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
667 break;
668 }
669 ccode = chsc(sccl_area);
670 if (ccode != 0)
671 return -EIO;
672 if (sccl_area->response.code != 0x0001) {
673 CHSC_MSG(0, "sccl: response code=%x\n",
674 sccl_area->response.code);
675 return -EIO;
676 }
677 memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
678 if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
679 return -EFAULT;
680 return 0;
681 }
682
chsc_ioctl_chpd(void __user * user_chpd)683 static int chsc_ioctl_chpd(void __user *user_chpd)
684 {
685 struct chsc_scpd *scpd_area __free(kfree) = NULL;
686 struct chsc_cpd_info *chpd __free(kfree) = NULL;
687 int ret;
688
689 chpd = kzalloc_obj(*chpd);
690 scpd_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
691 if (!scpd_area || !chpd)
692 return -ENOMEM;
693 if (copy_from_user(chpd, user_chpd, sizeof(*chpd)))
694 return -EFAULT;
695 ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
696 chpd->rfmt, chpd->c, chpd->m,
697 scpd_area);
698 if (ret)
699 return ret;
700 memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
701 if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
702 return -EFAULT;
703 return 0;
704 }
705
chsc_ioctl_dcal(void __user * user_dcal)706 static int chsc_ioctl_dcal(void __user *user_dcal)
707 {
708 struct chsc_dcal *dcal __free(kfree) = NULL;
709 int ccode;
710 struct {
711 struct chsc_header request;
712 u32 atype : 8;
713 u32 : 4;
714 u32 fmt : 4;
715 u32 : 16;
716 u32 res0[2];
717 u32 list_parm[2];
718 u32 res1[2];
719 struct chsc_header response;
720 u8 data[PAGE_SIZE - 36];
721 } __attribute__ ((packed)) *sdcal_area __free(kfree) = NULL;
722
723 sdcal_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
724 if (!sdcal_area)
725 return -ENOMEM;
726 dcal = kzalloc_obj(*dcal);
727 if (!dcal)
728 return -ENOMEM;
729 if (copy_from_user(dcal, user_dcal, sizeof(*dcal)))
730 return -EFAULT;
731 sdcal_area->request.length = 0x0020;
732 sdcal_area->request.code = 0x0034;
733 sdcal_area->atype = dcal->req.atype;
734 sdcal_area->fmt = dcal->req.fmt;
735 memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
736 sizeof(sdcal_area->list_parm));
737
738 ccode = chsc(sdcal_area);
739 if (ccode != 0)
740 return -EIO;
741 if (sdcal_area->response.code != 0x0001) {
742 CHSC_MSG(0, "sdcal: response code=%x\n",
743 sdcal_area->response.code);
744 return -EIO;
745 }
746 memcpy(&dcal->sdcal, &sdcal_area->response,
747 sdcal_area->response.length);
748 if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
749 return -EFAULT;
750 return 0;
751 }
752
chsc_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)753 static long chsc_ioctl(struct file *filp, unsigned int cmd,
754 unsigned long arg)
755 {
756 void __user *argp;
757
758 CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
759 argp = (void __user *)arg;
760 switch (cmd) {
761 case CHSC_START:
762 return chsc_ioctl_start(argp);
763 case CHSC_START_SYNC:
764 return chsc_ioctl_start_sync(argp);
765 case CHSC_INFO_CHANNEL_PATH:
766 return chsc_ioctl_info_channel_path(argp);
767 case CHSC_INFO_CU:
768 return chsc_ioctl_info_cu(argp);
769 case CHSC_INFO_SCH_CU:
770 return chsc_ioctl_info_sch_cu(argp);
771 case CHSC_INFO_CI:
772 return chsc_ioctl_conf_info(argp);
773 case CHSC_INFO_CCL:
774 return chsc_ioctl_conf_comp_list(argp);
775 case CHSC_INFO_CPD:
776 return chsc_ioctl_chpd(argp);
777 case CHSC_INFO_DCAL:
778 return chsc_ioctl_dcal(argp);
779 case CHSC_ON_CLOSE_SET:
780 return chsc_ioctl_on_close_set(argp);
781 case CHSC_ON_CLOSE_REMOVE:
782 return chsc_ioctl_on_close_remove();
783 default: /* unknown ioctl number */
784 return -ENOIOCTLCMD;
785 }
786 }
787
788 static atomic_t chsc_ready_for_use = ATOMIC_INIT(1);
789
chsc_open(struct inode * inode,struct file * file)790 static int chsc_open(struct inode *inode, struct file *file)
791 {
792 if (!atomic_dec_and_test(&chsc_ready_for_use)) {
793 atomic_inc(&chsc_ready_for_use);
794 return -EBUSY;
795 }
796 return nonseekable_open(inode, file);
797 }
798
chsc_release(struct inode * inode,struct file * filp)799 static int chsc_release(struct inode *inode, struct file *filp)
800 {
801 char dbf[13];
802 int ret;
803
804 mutex_lock(&on_close_mutex);
805 if (!on_close_chsc_area)
806 goto out_unlock;
807 init_completion(&on_close_request->completion);
808 CHSC_LOG(0, "on_close");
809 chsc_log_command(on_close_chsc_area);
810 spin_lock_irq(&chsc_lock);
811 ret = chsc_async(on_close_chsc_area, on_close_request);
812 spin_unlock_irq(&chsc_lock);
813 if (ret == -EINPROGRESS) {
814 wait_for_completion(&on_close_request->completion);
815 ret = chsc_examine_irb(on_close_request);
816 }
817 snprintf(dbf, sizeof(dbf), "relret:%d", ret);
818 CHSC_LOG(0, dbf);
819 kfree(on_close_chsc_area);
820 on_close_chsc_area = NULL;
821 kfree(on_close_request);
822 on_close_request = NULL;
823 out_unlock:
824 mutex_unlock(&on_close_mutex);
825 atomic_inc(&chsc_ready_for_use);
826 return 0;
827 }
828
829 static const struct file_operations chsc_fops = {
830 .owner = THIS_MODULE,
831 .open = chsc_open,
832 .release = chsc_release,
833 .unlocked_ioctl = chsc_ioctl,
834 };
835
836 static struct miscdevice chsc_misc_device = {
837 .minor = MISC_DYNAMIC_MINOR,
838 .name = "chsc",
839 .fops = &chsc_fops,
840 };
841
chsc_misc_init(void)842 static int __init chsc_misc_init(void)
843 {
844 return misc_register(&chsc_misc_device);
845 }
846
chsc_misc_cleanup(void)847 static void chsc_misc_cleanup(void)
848 {
849 misc_deregister(&chsc_misc_device);
850 }
851
chsc_sch_init(void)852 static int __init chsc_sch_init(void)
853 {
854 int ret;
855
856 ret = chsc_init_dbfs();
857 if (ret)
858 return ret;
859 isc_register(CHSC_SCH_ISC);
860 ret = chsc_init_sch_driver();
861 if (ret)
862 goto out_dbf;
863 ret = chsc_misc_init();
864 if (ret)
865 goto out_driver;
866 return ret;
867 out_driver:
868 chsc_cleanup_sch_driver();
869 out_dbf:
870 isc_unregister(CHSC_SCH_ISC);
871 chsc_remove_dbfs();
872 return ret;
873 }
874
chsc_sch_exit(void)875 static void __exit chsc_sch_exit(void)
876 {
877 chsc_misc_cleanup();
878 chsc_cleanup_sch_driver();
879 isc_unregister(CHSC_SCH_ISC);
880 chsc_remove_dbfs();
881 }
882
883 module_init(chsc_sch_init);
884 module_exit(chsc_sch_exit);
885