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Merge remote-tracking branches 'asoc/topic/mc13783', 'asoc/topic/msm8916', 'asoc...
[linux-2.6-block.git] / drivers / s390 / cio / chsc_sch.c
CommitLineData
724117b7 1// SPDX-License-Identifier: GPL-2.0
9d92a7e1
CH		 2/*
3 * Driver for s390 chsc subchannels
4 *
65b4e403 5 * Copyright IBM Corp. 2008, 2011
ad285ae9 6 *
9d92a7e1
CH		 7 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
8 *
9 */
10
5a0e3ad6 11#include <linux/slab.h>
048cd4e5 12#include <linux/compat.h>
9d92a7e1
CH		 13#include <linux/device.h>
14#include <linux/module.h>
15#include <linux/uaccess.h>
16#include <linux/miscdevice.h>
65b4e403 17#include <linux/kernel_stat.h>
9d92a7e1 18
44ee6a85 19#include <asm/compat.h>
9d92a7e1
CH		 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
30static debug_info_t *chsc_debug_msg_id;
31static debug_info_t *chsc_debug_log_id;
32
e9a8f32a
MH		 33static struct chsc_request *on_close_request;
34static struct chsc_async_area *on_close_chsc_area;
35static DEFINE_MUTEX(on_close_mutex);
36
9d92a7e1
CH		 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
45static void CHSC_LOG_HEX(int level, void *data, int length)
46{
94158e54 47 debug_event(chsc_debug_log_id, level, data, length);
9d92a7e1
CH		 48}
49
50MODULE_AUTHOR("IBM Corporation");
51MODULE_DESCRIPTION("driver for s390 chsc subchannels");
52MODULE_LICENSE("GPL");
53
54static void chsc_subchannel_irq(struct subchannel *sch)
55{
85fb534e 56 struct chsc_private *private = dev_get_drvdata(&sch->dev);
9d92a7e1 57 struct chsc_request *request = private->request;
0bf7fcf1 58 struct irb *irb = this_cpu_ptr(&cio_irb);
9d92a7e1
CH		 59
60 CHSC_LOG(4, "irb");
61 CHSC_LOG_HEX(4, irb, sizeof(*irb));
420f42ec 62 inc_irq_stat(IRQIO_CSC);
65b4e403 63
9d92a7e1
CH		 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));
cdb912a4 72 cio_update_schib(sch);
9d92a7e1
CH		 73 complete(&request->completion);
74 put_device(&sch->dev);
75}
76
77static 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;
85fb534e 88 dev_set_drvdata(&sch->dev, private);
9d92a7e1
CH		 89 ret = cio_enable_subchannel(sch, (u32)(unsigned long)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);
85fb534e 93 dev_set_drvdata(&sch->dev, NULL);
9d92a7e1
CH		 94 kfree(private);
95 } else {
f67f129e
ML		 96 if (dev_get_uevent_suppress(&sch->dev)) {
97 dev_set_uevent_suppress(&sch->dev, 0);
9d92a7e1
CH		 98 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
99 }
100 }
101 return ret;
102}
103
104static int chsc_subchannel_remove(struct subchannel *sch)
105{
106 struct chsc_private *private;
107
108 cio_disable_subchannel(sch);
85fb534e
SO		 109 private = dev_get_drvdata(&sch->dev);
110 dev_set_drvdata(&sch->dev, NULL);
9d92a7e1
CH		 111 if (private->request) {
112 complete(&private->request->completion);
113 put_device(&sch->dev);
114 }
115 kfree(private);
116 return 0;
117}
118
119static void chsc_subchannel_shutdown(struct subchannel *sch)
120{
121 cio_disable_subchannel(sch);
122}
123
ad285ae9
CH		 124static int chsc_subchannel_prepare(struct subchannel *sch)
125{
126 int cc;
127 struct schib schib;
128 /*
129 * Don't allow suspend while the subchannel is not idle
130 * since we don't have a way to clear the subchannel and
131 * cannot disable it with a request running.
132 */
62e65da9 133 cc = stsch(sch->schid, &schib);
ad285ae9
CH		 134 if (!cc && scsw_stctl(&schib.scsw))
135 return -EAGAIN;
136 return 0;
137}
138
139static int chsc_subchannel_freeze(struct subchannel *sch)
140{
141 return cio_disable_subchannel(sch);
142}
143
144static int chsc_subchannel_restore(struct subchannel *sch)
145{
146 return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
147}
148
9d92a7e1
CH		 149static struct css_device_id chsc_subchannel_ids[] = {
150 { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
151 { /* end of list */ },
152};
153MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
154
155static struct css_driver chsc_subchannel_driver = {
e6aed122
SO		 156 .drv = {
157 .owner = THIS_MODULE,
158 .name = "chsc_subchannel",
159 },
9d92a7e1
CH		 160 .subchannel_type = chsc_subchannel_ids,
161 .irq = chsc_subchannel_irq,
162 .probe = chsc_subchannel_probe,
163 .remove = chsc_subchannel_remove,
164 .shutdown = chsc_subchannel_shutdown,
ad285ae9
CH		 165 .prepare = chsc_subchannel_prepare,
166 .freeze = chsc_subchannel_freeze,
167 .thaw = chsc_subchannel_restore,
168 .restore = chsc_subchannel_restore,
9d92a7e1
CH		 169};
170
171static int __init chsc_init_dbfs(void)
172{
f7e1e65d 173 chsc_debug_msg_id = debug_register("chsc_msg", 8, 1, 4 * sizeof(long));
9d92a7e1
CH		 174 if (!chsc_debug_msg_id)
175 goto out;
176 debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
177 debug_set_level(chsc_debug_msg_id, 2);
178 chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
179 if (!chsc_debug_log_id)
180 goto out;
181 debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
182 debug_set_level(chsc_debug_log_id, 2);
183 return 0;
184out:
a6e975c5 185 debug_unregister(chsc_debug_msg_id);
9d92a7e1
CH		 186 return -ENOMEM;
187}
188
189static void chsc_remove_dbfs(void)
190{
191 debug_unregister(chsc_debug_log_id);
192 debug_unregister(chsc_debug_msg_id);
193}
194
195static int __init chsc_init_sch_driver(void)
196{
197 return css_driver_register(&chsc_subchannel_driver);
198}
199
200static void chsc_cleanup_sch_driver(void)
201{
202 css_driver_unregister(&chsc_subchannel_driver);
203}
204
205static DEFINE_SPINLOCK(chsc_lock);
206
207static int chsc_subchannel_match_next_free(struct device *dev, void *data)
208{
209 struct subchannel *sch = to_subchannel(dev);
210
211 return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
212}
213
214static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
215{
216 struct device *dev;
217
218 dev = driver_find_device(&chsc_subchannel_driver.drv,
219 sch ? &sch->dev : NULL, NULL,
220 chsc_subchannel_match_next_free);
221 return dev ? to_subchannel(dev) : NULL;
222}
223
224/**
225 * chsc_async() - try to start a chsc request asynchronously
226 * @chsc_area: request to be started
227 * @request: request structure to associate
228 *
229 * Tries to start a chsc request on one of the existing chsc subchannels.
230 * Returns:
231 * %0 if the request was performed synchronously
232 * %-EINPROGRESS if the request was successfully started
233 * %-EBUSY if all chsc subchannels are busy
234 * %-ENODEV if no chsc subchannels are available
235 * Context:
236 * interrupts disabled, chsc_lock held
237 */
238static int chsc_async(struct chsc_async_area *chsc_area,
239 struct chsc_request *request)
240{
241 int cc;
242 struct chsc_private *private;
243 struct subchannel *sch = NULL;
244 int ret = -ENODEV;
245 char dbf[10];
246
d1bf8590 247 chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
9d92a7e1
CH		 248 while ((sch = chsc_get_next_subchannel(sch))) {
249 spin_lock(sch->lock);
85fb534e 250 private = dev_get_drvdata(&sch->dev);
9d92a7e1
CH		 251 if (private->request) {
252 spin_unlock(sch->lock);
253 ret = -EBUSY;
254 continue;
255 }
256 chsc_area->header.sid = sch->schid;
257 CHSC_LOG(2, "schid");
258 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
259 cc = chsc(chsc_area);
60d081c5 260 snprintf(dbf, sizeof(dbf), "cc:%d", cc);
9d92a7e1
CH		 261 CHSC_LOG(2, dbf);
262 switch (cc) {
263 case 0:
264 ret = 0;
265 break;
266 case 1:
267 sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
268 ret = -EINPROGRESS;
269 private->request = request;
270 break;
271 case 2:
272 ret = -EBUSY;
273 break;
274 default:
275 ret = -ENODEV;
276 }
277 spin_unlock(sch->lock);
278 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
279 sch->schid.ssid, sch->schid.sch_no, cc);
280 if (ret == -EINPROGRESS)
281 return -EINPROGRESS;
282 put_device(&sch->dev);
283 if (ret == 0)
284 return 0;
285 }
286 return ret;
287}
288
64150adf 289static void chsc_log_command(void *chsc_area)
9d92a7e1
CH		 290{
291 char dbf[10];
292
60d081c5 293 snprintf(dbf, sizeof(dbf), "CHSC:%x", ((uint16_t *)chsc_area)[1]);
9d92a7e1
CH		 294 CHSC_LOG(0, dbf);
295 CHSC_LOG_HEX(0, chsc_area, 32);
296}
297
298static int chsc_examine_irb(struct chsc_request *request)
299{
300 int backed_up;
301
b2bbb642 302 if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
9d92a7e1
CH		 303 return -EIO;
304 backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
305 request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
306 if (scsw_cstat(&request->irb.scsw) == 0)
307 return 0;
308 if (!backed_up)
309 return 0;
310 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
311 return -EIO;
312 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
313 return -EPERM;
314 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
315 return -EAGAIN;
316 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
317 return -EAGAIN;
318 return -EIO;
319}
320
321static int chsc_ioctl_start(void __user *user_area)
322{
323 struct chsc_request *request;
324 struct chsc_async_area *chsc_area;
325 int ret;
326 char dbf[10];
327
328 if (!css_general_characteristics.dynio)
329 /* It makes no sense to try. */
330 return -EOPNOTSUPP;
331 chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
332 if (!chsc_area)
333 return -ENOMEM;
334 request = kzalloc(sizeof(*request), GFP_KERNEL);
335 if (!request) {
336 ret = -ENOMEM;
337 goto out_free;
338 }
339 init_completion(&request->completion);
340 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
341 ret = -EFAULT;
342 goto out_free;
343 }
344 chsc_log_command(chsc_area);
345 spin_lock_irq(&chsc_lock);
346 ret = chsc_async(chsc_area, request);
347 spin_unlock_irq(&chsc_lock);
348 if (ret == -EINPROGRESS) {
349 wait_for_completion(&request->completion);
350 ret = chsc_examine_irb(request);
351 }
352 /* copy area back to user */
353 if (!ret)
354 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
355 ret = -EFAULT;
356out_free:
60d081c5 357 snprintf(dbf, sizeof(dbf), "ret:%d", ret);
9d92a7e1
CH		 358 CHSC_LOG(0, dbf);
359 kfree(request);
360 free_page((unsigned long)chsc_area);
361 return ret;
362}
363
e9a8f32a
MH		 364static int chsc_ioctl_on_close_set(void __user *user_area)
365{
366 char dbf[13];
367 int ret;
368
369 mutex_lock(&on_close_mutex);
370 if (on_close_chsc_area) {
371 ret = -EBUSY;
372 goto out_unlock;
373 }
374 on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL);
375 if (!on_close_request) {
376 ret = -ENOMEM;
377 goto out_unlock;
378 }
379 on_close_chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
380 if (!on_close_chsc_area) {
381 ret = -ENOMEM;
382 goto out_free_request;
383 }
384 if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) {
385 ret = -EFAULT;
386 goto out_free_chsc;
387 }
388 ret = 0;
389 goto out_unlock;
390
391out_free_chsc:
392 free_page((unsigned long)on_close_chsc_area);
393 on_close_chsc_area = NULL;
394out_free_request:
395 kfree(on_close_request);
396 on_close_request = NULL;
397out_unlock:
398 mutex_unlock(&on_close_mutex);
60d081c5 399 snprintf(dbf, sizeof(dbf), "ocsret:%d", ret);
e9a8f32a
MH		 400 CHSC_LOG(0, dbf);
401 return ret;
402}
403
404static int chsc_ioctl_on_close_remove(void)
405{
406 char dbf[13];
407 int ret;
408
409 mutex_lock(&on_close_mutex);
410 if (!on_close_chsc_area) {
411 ret = -ENOENT;
412 goto out_unlock;
413 }
414 free_page((unsigned long)on_close_chsc_area);
415 on_close_chsc_area = NULL;
416 kfree(on_close_request);
417 on_close_request = NULL;
418 ret = 0;
419out_unlock:
420 mutex_unlock(&on_close_mutex);
60d081c5 421 snprintf(dbf, sizeof(dbf), "ocrret:%d", ret);
e9a8f32a
MH		 422 CHSC_LOG(0, dbf);
423 return ret;
424}
425
64150adf
MH		 426static int chsc_ioctl_start_sync(void __user *user_area)
427{
428 struct chsc_sync_area *chsc_area;
429 int ret, ccode;
430
431 chsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
432 if (!chsc_area)
433 return -ENOMEM;
434 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
435 ret = -EFAULT;
436 goto out_free;
437 }
438 if (chsc_area->header.code & 0x4000) {
439 ret = -EINVAL;
440 goto out_free;
441 }
442 chsc_log_command(chsc_area);
443 ccode = chsc(chsc_area);
444 if (ccode != 0) {
445 ret = -EIO;
446 goto out_free;
447 }
448 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
449 ret = -EFAULT;
450 else
451 ret = 0;
452out_free:
453 free_page((unsigned long)chsc_area);
454 return ret;
455}
456
9d92a7e1
CH		 457static int chsc_ioctl_info_channel_path(void __user *user_cd)
458{
459 struct chsc_chp_cd *cd;
460 int ret, ccode;
461 struct {
462 struct chsc_header request;
463 u32 : 2;
464 u32 m : 1;
465 u32 : 1;
466 u32 fmt1 : 4;
467 u32 cssid : 8;
468 u32 : 8;
469 u32 first_chpid : 8;
470 u32 : 24;
471 u32 last_chpid : 8;
472 u32 : 32;
473 struct chsc_header response;
474 u8 data[PAGE_SIZE - 20];
475 } __attribute__ ((packed)) *scpcd_area;
476
477 scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
478 if (!scpcd_area)
479 return -ENOMEM;
480 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
481 if (!cd) {
482 ret = -ENOMEM;
483 goto out_free;
484 }
485 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
486 ret = -EFAULT;
487 goto out_free;
488 }
489 scpcd_area->request.length = 0x0010;
490 scpcd_area->request.code = 0x0028;
491 scpcd_area->m = cd->m;
492 scpcd_area->fmt1 = cd->fmt;
493 scpcd_area->cssid = cd->chpid.cssid;
494 scpcd_area->first_chpid = cd->chpid.id;
495 scpcd_area->last_chpid = cd->chpid.id;
496
497 ccode = chsc(scpcd_area);
498 if (ccode != 0) {
499 ret = -EIO;
500 goto out_free;
501 }
502 if (scpcd_area->response.code != 0x0001) {
503 ret = -EIO;
504 CHSC_MSG(0, "scpcd: response code=%x\n",
505 scpcd_area->response.code);
506 goto out_free;
507 }
508 memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
509 if (copy_to_user(user_cd, cd, sizeof(*cd)))
510 ret = -EFAULT;
511 else
512 ret = 0;
513out_free:
514 kfree(cd);
515 free_page((unsigned long)scpcd_area);
516 return ret;
517}
518
519static int chsc_ioctl_info_cu(void __user *user_cd)
520{
521 struct chsc_cu_cd *cd;
522 int ret, ccode;
523 struct {
524 struct chsc_header request;
525 u32 : 2;
526 u32 m : 1;
527 u32 : 1;
528 u32 fmt1 : 4;
529 u32 cssid : 8;
530 u32 : 8;
531 u32 first_cun : 8;
532 u32 : 24;
533 u32 last_cun : 8;
534 u32 : 32;
535 struct chsc_header response;
536 u8 data[PAGE_SIZE - 20];
537 } __attribute__ ((packed)) *scucd_area;
538
539 scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
540 if (!scucd_area)
541 return -ENOMEM;
542 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
543 if (!cd) {
544 ret = -ENOMEM;
545 goto out_free;
546 }
547 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
548 ret = -EFAULT;
549 goto out_free;
550 }
551 scucd_area->request.length = 0x0010;
6228c2a5 552 scucd_area->request.code = 0x0026;
9d92a7e1
CH		 553 scucd_area->m = cd->m;
554 scucd_area->fmt1 = cd->fmt;
555 scucd_area->cssid = cd->cssid;
556 scucd_area->first_cun = cd->cun;
557 scucd_area->last_cun = cd->cun;
558
559 ccode = chsc(scucd_area);
560 if (ccode != 0) {
561 ret = -EIO;
562 goto out_free;
563 }
564 if (scucd_area->response.code != 0x0001) {
565 ret = -EIO;
566 CHSC_MSG(0, "scucd: response code=%x\n",
567 scucd_area->response.code);
568 goto out_free;
569 }
570 memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
571 if (copy_to_user(user_cd, cd, sizeof(*cd)))
572 ret = -EFAULT;
573 else
574 ret = 0;
575out_free:
576 kfree(cd);
577 free_page((unsigned long)scucd_area);
578 return ret;
579}
580
581static int chsc_ioctl_info_sch_cu(void __user *user_cud)
582{
583 struct chsc_sch_cud *cud;
584 int ret, ccode;
585 struct {
586 struct chsc_header request;
587 u32 : 2;
588 u32 m : 1;
589 u32 : 5;
590 u32 fmt1 : 4;
591 u32 : 2;
592 u32 ssid : 2;
593 u32 first_sch : 16;
594 u32 : 8;
595 u32 cssid : 8;
596 u32 last_sch : 16;
597 u32 : 32;
598 struct chsc_header response;
599 u8 data[PAGE_SIZE - 20];
600 } __attribute__ ((packed)) *sscud_area;
601
602 sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
603 if (!sscud_area)
604 return -ENOMEM;
605 cud = kzalloc(sizeof(*cud), GFP_KERNEL);
606 if (!cud) {
607 ret = -ENOMEM;
608 goto out_free;
609 }
610 if (copy_from_user(cud, user_cud, sizeof(*cud))) {
611 ret = -EFAULT;
612 goto out_free;
613 }
614 sscud_area->request.length = 0x0010;
615 sscud_area->request.code = 0x0006;
616 sscud_area->m = cud->schid.m;
617 sscud_area->fmt1 = cud->fmt;
618 sscud_area->ssid = cud->schid.ssid;
619 sscud_area->first_sch = cud->schid.sch_no;
620 sscud_area->cssid = cud->schid.cssid;
621 sscud_area->last_sch = cud->schid.sch_no;
622
623 ccode = chsc(sscud_area);
624 if (ccode != 0) {
625 ret = -EIO;
626 goto out_free;
627 }
628 if (sscud_area->response.code != 0x0001) {
629 ret = -EIO;
630 CHSC_MSG(0, "sscud: response code=%x\n",
631 sscud_area->response.code);
632 goto out_free;
633 }
634 memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
635 if (copy_to_user(user_cud, cud, sizeof(*cud)))
636 ret = -EFAULT;
637 else
638 ret = 0;
639out_free:
640 kfree(cud);
641 free_page((unsigned long)sscud_area);
642 return ret;
643}
644
645static int chsc_ioctl_conf_info(void __user *user_ci)
646{
647 struct chsc_conf_info *ci;
648 int ret, ccode;
649 struct {
650 struct chsc_header request;
651 u32 : 2;
652 u32 m : 1;
653 u32 : 1;
654 u32 fmt1 : 4;
655 u32 cssid : 8;
656 u32 : 6;
657 u32 ssid : 2;
658 u32 : 8;
659 u64 : 64;
660 struct chsc_header response;
661 u8 data[PAGE_SIZE - 20];
662 } __attribute__ ((packed)) *sci_area;
663
664 sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
665 if (!sci_area)
666 return -ENOMEM;
667 ci = kzalloc(sizeof(*ci), GFP_KERNEL);
668 if (!ci) {
669 ret = -ENOMEM;
670 goto out_free;
671 }
672 if (copy_from_user(ci, user_ci, sizeof(*ci))) {
673 ret = -EFAULT;
674 goto out_free;
675 }
676 sci_area->request.length = 0x0010;
677 sci_area->request.code = 0x0012;
678 sci_area->m = ci->id.m;
679 sci_area->fmt1 = ci->fmt;
680 sci_area->cssid = ci->id.cssid;
681 sci_area->ssid = ci->id.ssid;
682
683 ccode = chsc(sci_area);
684 if (ccode != 0) {
685 ret = -EIO;
686 goto out_free;
687 }
688 if (sci_area->response.code != 0x0001) {
689 ret = -EIO;
690 CHSC_MSG(0, "sci: response code=%x\n",
691 sci_area->response.code);
692 goto out_free;
693 }
694 memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
695 if (copy_to_user(user_ci, ci, sizeof(*ci)))
696 ret = -EFAULT;
697 else
698 ret = 0;
699out_free:
700 kfree(ci);
701 free_page((unsigned long)sci_area);
702 return ret;
703}
704
705static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
706{
707 struct chsc_comp_list *ccl;
708 int ret, ccode;
709 struct {
710 struct chsc_header request;
711 u32 ctype : 8;
712 u32 : 4;
713 u32 fmt : 4;
714 u32 : 16;
715 u64 : 64;
716 u32 list_parm[2];
717 u64 : 64;
718 struct chsc_header response;
719 u8 data[PAGE_SIZE - 36];
720 } __attribute__ ((packed)) *sccl_area;
721 struct {
722 u32 m : 1;
723 u32 : 31;
724 u32 cssid : 8;
725 u32 : 16;
726 u32 chpid : 8;
727 } __attribute__ ((packed)) *chpid_parm;
728 struct {
729 u32 f_cssid : 8;
730 u32 l_cssid : 8;
731 u32 : 16;
732 u32 res;
733 } __attribute__ ((packed)) *cssids_parm;
734
735 sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
736 if (!sccl_area)
737 return -ENOMEM;
738 ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
739 if (!ccl) {
740 ret = -ENOMEM;
741 goto out_free;
742 }
743 if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
744 ret = -EFAULT;
745 goto out_free;
746 }
747 sccl_area->request.length = 0x0020;
748 sccl_area->request.code = 0x0030;
749 sccl_area->fmt = ccl->req.fmt;
750 sccl_area->ctype = ccl->req.ctype;
751 switch (sccl_area->ctype) {
752 case CCL_CU_ON_CHP:
753 case CCL_IOP_CHP:
754 chpid_parm = (void *)&sccl_area->list_parm;
755 chpid_parm->m = ccl->req.chpid.m;
756 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
757 chpid_parm->chpid = ccl->req.chpid.chp.id;
758 break;
759 case CCL_CSS_IMG:
760 case CCL_CSS_IMG_CONF_CHAR:
761 cssids_parm = (void *)&sccl_area->list_parm;
762 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
763 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
764 break;
765 }
766 ccode = chsc(sccl_area);
767 if (ccode != 0) {
768 ret = -EIO;
769 goto out_free;
770 }
771 if (sccl_area->response.code != 0x0001) {
772 ret = -EIO;
773 CHSC_MSG(0, "sccl: response code=%x\n",
774 sccl_area->response.code);
775 goto out_free;
776 }
777 memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
778 if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
779 ret = -EFAULT;
780 else
781 ret = 0;
782out_free:
783 kfree(ccl);
784 free_page((unsigned long)sccl_area);
785 return ret;
786}
787
788static int chsc_ioctl_chpd(void __user *user_chpd)
789{
906c9768 790 struct chsc_scpd *scpd_area;
9d92a7e1
CH		 791 struct chsc_cpd_info *chpd;
792 int ret;
793
794 chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
906c9768
SO		 795 scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
796 if (!scpd_area || !chpd) {
797 ret = -ENOMEM;
798 goto out_free;
799 }
9d92a7e1
CH		 800 if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
801 ret = -EFAULT;
802 goto out_free;
803 }
804 ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
805 chpd->rfmt, chpd->c, chpd->m,
906c9768 806 scpd_area);
9d92a7e1
CH		 807 if (ret)
808 goto out_free;
906c9768 809 memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
9d92a7e1
CH		 810 if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
811 ret = -EFAULT;
812out_free:
813 kfree(chpd);
906c9768 814 free_page((unsigned long)scpd_area);
9d92a7e1
CH		 815 return ret;
816}
817
818static int chsc_ioctl_dcal(void __user *user_dcal)
819{
820 struct chsc_dcal *dcal;
821 int ret, ccode;
822 struct {
823 struct chsc_header request;
824 u32 atype : 8;
825 u32 : 4;
826 u32 fmt : 4;
827 u32 : 16;
828 u32 res0[2];
829 u32 list_parm[2];
830 u32 res1[2];
831 struct chsc_header response;
832 u8 data[PAGE_SIZE - 36];
833 } __attribute__ ((packed)) *sdcal_area;
834
835 sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
836 if (!sdcal_area)
837 return -ENOMEM;
838 dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
839 if (!dcal) {
840 ret = -ENOMEM;
841 goto out_free;
842 }
843 if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
844 ret = -EFAULT;
845 goto out_free;
846 }
847 sdcal_area->request.length = 0x0020;
848 sdcal_area->request.code = 0x0034;
849 sdcal_area->atype = dcal->req.atype;
850 sdcal_area->fmt = dcal->req.fmt;
851 memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
852 sizeof(sdcal_area->list_parm));
853
854 ccode = chsc(sdcal_area);
855 if (ccode != 0) {
856 ret = -EIO;
857 goto out_free;
858 }
859 if (sdcal_area->response.code != 0x0001) {
860 ret = -EIO;
861 CHSC_MSG(0, "sdcal: response code=%x\n",
862 sdcal_area->response.code);
863 goto out_free;
864 }
865 memcpy(&dcal->sdcal, &sdcal_area->response,
866 sdcal_area->response.length);
867 if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
868 ret = -EFAULT;
869 else
870 ret = 0;
871out_free:
872 kfree(dcal);
873 free_page((unsigned long)sdcal_area);
874 return ret;
875}
876
877static long chsc_ioctl(struct file *filp, unsigned int cmd,
878 unsigned long arg)
879{
44ee6a85
HC		 880 void __user *argp;
881
9d92a7e1 882 CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
44ee6a85
HC		 883 if (is_compat_task())
884 argp = compat_ptr(arg);
885 else
886 argp = (void __user *)arg;
9d92a7e1
CH		 887 switch (cmd) {
888 case CHSC_START:
44ee6a85 889 return chsc_ioctl_start(argp);
64150adf
MH		 890 case CHSC_START_SYNC:
891 return chsc_ioctl_start_sync(argp);
9d92a7e1 892 case CHSC_INFO_CHANNEL_PATH:
44ee6a85 893 return chsc_ioctl_info_channel_path(argp);
9d92a7e1 894 case CHSC_INFO_CU:
44ee6a85 895 return chsc_ioctl_info_cu(argp);
9d92a7e1 896 case CHSC_INFO_SCH_CU:
44ee6a85 897 return chsc_ioctl_info_sch_cu(argp);
9d92a7e1 898 case CHSC_INFO_CI:
44ee6a85 899 return chsc_ioctl_conf_info(argp);
9d92a7e1 900 case CHSC_INFO_CCL:
44ee6a85 901 return chsc_ioctl_conf_comp_list(argp);
9d92a7e1 902 case CHSC_INFO_CPD:
44ee6a85 903 return chsc_ioctl_chpd(argp);
9d92a7e1 904 case CHSC_INFO_DCAL:
44ee6a85 905 return chsc_ioctl_dcal(argp);
e9a8f32a
MH		 906 case CHSC_ON_CLOSE_SET:
907 return chsc_ioctl_on_close_set(argp);
908 case CHSC_ON_CLOSE_REMOVE:
909 return chsc_ioctl_on_close_remove();
9d92a7e1
CH		 910 default: /* unknown ioctl number */
911 return -ENOIOCTLCMD;
912 }
913}
914
7a9cc6e1
MH		 915static atomic_t chsc_ready_for_use = ATOMIC_INIT(1);
916
917static int chsc_open(struct inode *inode, struct file *file)
918{
919 if (!atomic_dec_and_test(&chsc_ready_for_use)) {
920 atomic_inc(&chsc_ready_for_use);
921 return -EBUSY;
922 }
923 return nonseekable_open(inode, file);
924}
925
926static int chsc_release(struct inode *inode, struct file *filp)
927{
e9a8f32a
MH		 928 char dbf[13];
929 int ret;
930
931 mutex_lock(&on_close_mutex);
932 if (!on_close_chsc_area)
933 goto out_unlock;
934 init_completion(&on_close_request->completion);
935 CHSC_LOG(0, "on_close");
936 chsc_log_command(on_close_chsc_area);
937 spin_lock_irq(&chsc_lock);
938 ret = chsc_async(on_close_chsc_area, on_close_request);
939 spin_unlock_irq(&chsc_lock);
940 if (ret == -EINPROGRESS) {
941 wait_for_completion(&on_close_request->completion);
942 ret = chsc_examine_irb(on_close_request);
943 }
60d081c5 944 snprintf(dbf, sizeof(dbf), "relret:%d", ret);
e9a8f32a
MH		 945 CHSC_LOG(0, dbf);
946 free_page((unsigned long)on_close_chsc_area);
947 on_close_chsc_area = NULL;
948 kfree(on_close_request);
949 on_close_request = NULL;
950out_unlock:
951 mutex_unlock(&on_close_mutex);
7a9cc6e1
MH		 952 atomic_inc(&chsc_ready_for_use);
953 return 0;
954}
955
9d92a7e1
CH		 956static const struct file_operations chsc_fops = {
957 .owner = THIS_MODULE,
7a9cc6e1
MH		 958 .open = chsc_open,
959 .release = chsc_release,
9d92a7e1
CH		 960 .unlocked_ioctl = chsc_ioctl,
961 .compat_ioctl = chsc_ioctl,
6038f373 962 .llseek = no_llseek,
9d92a7e1
CH		 963};
964
965static struct miscdevice chsc_misc_device = {
966 .minor = MISC_DYNAMIC_MINOR,
967 .name = "chsc",
968 .fops = &chsc_fops,
969};
970
971static int __init chsc_misc_init(void)
972{
973 return misc_register(&chsc_misc_device);
974}
975
976static void chsc_misc_cleanup(void)
977{
978 misc_deregister(&chsc_misc_device);
979}
980
981static int __init chsc_sch_init(void)
982{
983 int ret;
984
985 ret = chsc_init_dbfs();
986 if (ret)
987 return ret;
988 isc_register(CHSC_SCH_ISC);
989 ret = chsc_init_sch_driver();
990 if (ret)
991 goto out_dbf;
992 ret = chsc_misc_init();
993 if (ret)
994 goto out_driver;
995 return ret;
996out_driver:
997 chsc_cleanup_sch_driver();
998out_dbf:
999 isc_unregister(CHSC_SCH_ISC);
1000 chsc_remove_dbfs();
1001 return ret;
1002}
1003
1004static void __exit chsc_sch_exit(void)
1005{
1006 chsc_misc_cleanup();
1007 chsc_cleanup_sch_driver();
1008 isc_unregister(CHSC_SCH_ISC);
1009 chsc_remove_dbfs();
1010}
1011
1012module_init(chsc_sch_init);
1013module_exit(chsc_sch_exit);
Linux 6.x block layer and io_uring tree(s)