xref: /openbmc/linux/drivers/s390/cio/chsc_sch.c (revision 5c2e5a0c)
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_DMA | 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_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 	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 | GFP_DMA);
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 | GFP_DMA);
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 | GFP_DMA);
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 | GFP_DMA);
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 | GFP_DMA);
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 | GFP_DMA);
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 | GFP_DMA);
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 | GFP_DMA);
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 	.llseek = no_llseek,
928 };
929 
930 static struct miscdevice chsc_misc_device = {
931 	.minor = MISC_DYNAMIC_MINOR,
932 	.name = "chsc",
933 	.fops = &chsc_fops,
934 };
935 
chsc_misc_init(void)936 static int __init chsc_misc_init(void)
937 {
938 	return misc_register(&chsc_misc_device);
939 }
940 
chsc_misc_cleanup(void)941 static void chsc_misc_cleanup(void)
942 {
943 	misc_deregister(&chsc_misc_device);
944 }
945 
chsc_sch_init(void)946 static int __init chsc_sch_init(void)
947 {
948 	int ret;
949 
950 	ret = chsc_init_dbfs();
951 	if (ret)
952 		return ret;
953 	isc_register(CHSC_SCH_ISC);
954 	ret = chsc_init_sch_driver();
955 	if (ret)
956 		goto out_dbf;
957 	ret = chsc_misc_init();
958 	if (ret)
959 		goto out_driver;
960 	return ret;
961 out_driver:
962 	chsc_cleanup_sch_driver();
963 out_dbf:
964 	isc_unregister(CHSC_SCH_ISC);
965 	chsc_remove_dbfs();
966 	return ret;
967 }
968 
chsc_sch_exit(void)969 static void __exit chsc_sch_exit(void)
970 {
971 	chsc_misc_cleanup();
972 	chsc_cleanup_sch_driver();
973 	isc_unregister(CHSC_SCH_ISC);
974 	chsc_remove_dbfs();
975 }
976 
977 module_init(chsc_sch_init);
978 module_exit(chsc_sch_exit);
979