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Merge branch 'bkl/procfs' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic...
[linux-2.6-block.git] / drivers / s390 / cio / chsc_sch.c
CommitLineData
9d92a7e1
CH		 1/*
2 * Driver for s390 chsc subchannels
3 *
ad285ae9
CH		 4 * Copyright IBM Corp. 2008, 2009
5 *
9d92a7e1
CH		 6 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
7 *
8 */
9
5a0e3ad6 10#include <linux/slab.h>
9d92a7e1
CH		 11#include <linux/device.h>
12#include <linux/module.h>
13#include <linux/uaccess.h>
14#include <linux/miscdevice.h>
15
44ee6a85 16#include <asm/compat.h>
9d92a7e1
CH		 17#include <asm/cio.h>
18#include <asm/chsc.h>
19#include <asm/isc.h>
20
21#include "cio.h"
22#include "cio_debug.h"
23#include "css.h"
24#include "chsc_sch.h"
25#include "ioasm.h"
26
27static debug_info_t *chsc_debug_msg_id;
28static debug_info_t *chsc_debug_log_id;
29
30#define CHSC_MSG(imp, args...) do { \
31 debug_sprintf_event(chsc_debug_msg_id, imp , ##args); \
32 } while (0)
33
34#define CHSC_LOG(imp, txt) do { \
35 debug_text_event(chsc_debug_log_id, imp , txt); \
36 } while (0)
37
38static void CHSC_LOG_HEX(int level, void *data, int length)
39{
40 while (length > 0) {
41 debug_event(chsc_debug_log_id, level, data, length);
42 length -= chsc_debug_log_id->buf_size;
43 data += chsc_debug_log_id->buf_size;
44 }
45}
46
47MODULE_AUTHOR("IBM Corporation");
48MODULE_DESCRIPTION("driver for s390 chsc subchannels");
49MODULE_LICENSE("GPL");
50
51static void chsc_subchannel_irq(struct subchannel *sch)
52{
53 struct chsc_private *private = sch->private;
54 struct chsc_request *request = private->request;
cbb870c8 55 struct irb *irb = (struct irb *)&S390_lowcore.irb;
9d92a7e1
CH		 56
57 CHSC_LOG(4, "irb");
58 CHSC_LOG_HEX(4, irb, sizeof(*irb));
59 /* Copy irb to provided request and set done. */
60 if (!request) {
61 CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n",
62 sch->schid.ssid, sch->schid.sch_no);
63 return;
64 }
65 private->request = NULL;
66 memcpy(&request->irb, irb, sizeof(*irb));
cdb912a4 67 cio_update_schib(sch);
9d92a7e1
CH		 68 complete(&request->completion);
69 put_device(&sch->dev);
70}
71
72static int chsc_subchannel_probe(struct subchannel *sch)
73{
74 struct chsc_private *private;
75 int ret;
76
77 CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n",
78 sch->schid.ssid, sch->schid.sch_no);
79 sch->isc = CHSC_SCH_ISC;
80 private = kzalloc(sizeof(*private), GFP_KERNEL);
81 if (!private)
82 return -ENOMEM;
83 ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
84 if (ret) {
85 CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
86 sch->schid.ssid, sch->schid.sch_no, ret);
87 kfree(private);
88 } else {
89 sch->private = private;
f67f129e
ML		 90 if (dev_get_uevent_suppress(&sch->dev)) {
91 dev_set_uevent_suppress(&sch->dev, 0);
9d92a7e1
CH		 92 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
93 }
94 }
95 return ret;
96}
97
98static int chsc_subchannel_remove(struct subchannel *sch)
99{
100 struct chsc_private *private;
101
102 cio_disable_subchannel(sch);
103 private = sch->private;
104 sch->private = NULL;
105 if (private->request) {
106 complete(&private->request->completion);
107 put_device(&sch->dev);
108 }
109 kfree(private);
110 return 0;
111}
112
113static void chsc_subchannel_shutdown(struct subchannel *sch)
114{
115 cio_disable_subchannel(sch);
116}
117
ad285ae9
CH		 118static int chsc_subchannel_prepare(struct subchannel *sch)
119{
120 int cc;
121 struct schib schib;
122 /*
123 * Don't allow suspend while the subchannel is not idle
124 * since we don't have a way to clear the subchannel and
125 * cannot disable it with a request running.
126 */
8821d24c 127 cc = stsch_err(sch->schid, &schib);
ad285ae9
CH		 128 if (!cc && scsw_stctl(&schib.scsw))
129 return -EAGAIN;
130 return 0;
131}
132
133static int chsc_subchannel_freeze(struct subchannel *sch)
134{
135 return cio_disable_subchannel(sch);
136}
137
138static int chsc_subchannel_restore(struct subchannel *sch)
139{
140 return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
141}
142
9d92a7e1
CH		 143static struct css_device_id chsc_subchannel_ids[] = {
144 { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
145 { /* end of list */ },
146};
147MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
148
149static struct css_driver chsc_subchannel_driver = {
150 .owner = THIS_MODULE,
151 .subchannel_type = chsc_subchannel_ids,
152 .irq = chsc_subchannel_irq,
153 .probe = chsc_subchannel_probe,
154 .remove = chsc_subchannel_remove,
155 .shutdown = chsc_subchannel_shutdown,
ad285ae9
CH		 156 .prepare = chsc_subchannel_prepare,
157 .freeze = chsc_subchannel_freeze,
158 .thaw = chsc_subchannel_restore,
159 .restore = chsc_subchannel_restore,
9d92a7e1
CH		 160 .name = "chsc_subchannel",
161};
162
163static int __init chsc_init_dbfs(void)
164{
165 chsc_debug_msg_id = debug_register("chsc_msg", 16, 1,
166 16 * sizeof(long));
167 if (!chsc_debug_msg_id)
168 goto out;
169 debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
170 debug_set_level(chsc_debug_msg_id, 2);
171 chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
172 if (!chsc_debug_log_id)
173 goto out;
174 debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
175 debug_set_level(chsc_debug_log_id, 2);
176 return 0;
177out:
178 if (chsc_debug_msg_id)
179 debug_unregister(chsc_debug_msg_id);
180 return -ENOMEM;
181}
182
183static void chsc_remove_dbfs(void)
184{
185 debug_unregister(chsc_debug_log_id);
186 debug_unregister(chsc_debug_msg_id);
187}
188
189static int __init chsc_init_sch_driver(void)
190{
191 return css_driver_register(&chsc_subchannel_driver);
192}
193
194static void chsc_cleanup_sch_driver(void)
195{
196 css_driver_unregister(&chsc_subchannel_driver);
197}
198
199static DEFINE_SPINLOCK(chsc_lock);
200
201static int chsc_subchannel_match_next_free(struct device *dev, void *data)
202{
203 struct subchannel *sch = to_subchannel(dev);
204
205 return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
206}
207
208static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
209{
210 struct device *dev;
211
212 dev = driver_find_device(&chsc_subchannel_driver.drv,
213 sch ? &sch->dev : NULL, NULL,
214 chsc_subchannel_match_next_free);
215 return dev ? to_subchannel(dev) : NULL;
216}
217
218/**
219 * chsc_async() - try to start a chsc request asynchronously
220 * @chsc_area: request to be started
221 * @request: request structure to associate
222 *
223 * Tries to start a chsc request on one of the existing chsc subchannels.
224 * Returns:
225 * %0 if the request was performed synchronously
226 * %-EINPROGRESS if the request was successfully started
227 * %-EBUSY if all chsc subchannels are busy
228 * %-ENODEV if no chsc subchannels are available
229 * Context:
230 * interrupts disabled, chsc_lock held
231 */
232static int chsc_async(struct chsc_async_area *chsc_area,
233 struct chsc_request *request)
234{
235 int cc;
236 struct chsc_private *private;
237 struct subchannel *sch = NULL;
238 int ret = -ENODEV;
239 char dbf[10];
240
d1bf8590 241 chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
9d92a7e1
CH		 242 while ((sch = chsc_get_next_subchannel(sch))) {
243 spin_lock(sch->lock);
244 private = sch->private;
245 if (private->request) {
246 spin_unlock(sch->lock);
247 ret = -EBUSY;
248 continue;
249 }
250 chsc_area->header.sid = sch->schid;
251 CHSC_LOG(2, "schid");
252 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
253 cc = chsc(chsc_area);
254 sprintf(dbf, "cc:%d", cc);
255 CHSC_LOG(2, dbf);
256 switch (cc) {
257 case 0:
258 ret = 0;
259 break;
260 case 1:
261 sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
262 ret = -EINPROGRESS;
263 private->request = request;
264 break;
265 case 2:
266 ret = -EBUSY;
267 break;
268 default:
269 ret = -ENODEV;
270 }
271 spin_unlock(sch->lock);
272 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
273 sch->schid.ssid, sch->schid.sch_no, cc);
274 if (ret == -EINPROGRESS)
275 return -EINPROGRESS;
276 put_device(&sch->dev);
277 if (ret == 0)
278 return 0;
279 }
280 return ret;
281}
282
283static void chsc_log_command(struct chsc_async_area *chsc_area)
284{
285 char dbf[10];
286
287 sprintf(dbf, "CHSC:%x", chsc_area->header.code);
288 CHSC_LOG(0, dbf);
289 CHSC_LOG_HEX(0, chsc_area, 32);
290}
291
292static int chsc_examine_irb(struct chsc_request *request)
293{
294 int backed_up;
295
b2bbb642 296 if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
9d92a7e1
CH		 297 return -EIO;
298 backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
299 request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
300 if (scsw_cstat(&request->irb.scsw) == 0)
301 return 0;
302 if (!backed_up)
303 return 0;
304 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
305 return -EIO;
306 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
307 return -EPERM;
308 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
309 return -EAGAIN;
310 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
311 return -EAGAIN;
312 return -EIO;
313}
314
315static int chsc_ioctl_start(void __user *user_area)
316{
317 struct chsc_request *request;
318 struct chsc_async_area *chsc_area;
319 int ret;
320 char dbf[10];
321
322 if (!css_general_characteristics.dynio)
323 /* It makes no sense to try. */
324 return -EOPNOTSUPP;
325 chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
326 if (!chsc_area)
327 return -ENOMEM;
328 request = kzalloc(sizeof(*request), GFP_KERNEL);
329 if (!request) {
330 ret = -ENOMEM;
331 goto out_free;
332 }
333 init_completion(&request->completion);
334 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
335 ret = -EFAULT;
336 goto out_free;
337 }
338 chsc_log_command(chsc_area);
339 spin_lock_irq(&chsc_lock);
340 ret = chsc_async(chsc_area, request);
341 spin_unlock_irq(&chsc_lock);
342 if (ret == -EINPROGRESS) {
343 wait_for_completion(&request->completion);
344 ret = chsc_examine_irb(request);
345 }
346 /* copy area back to user */
347 if (!ret)
348 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
349 ret = -EFAULT;
350out_free:
351 sprintf(dbf, "ret:%d", ret);
352 CHSC_LOG(0, dbf);
353 kfree(request);
354 free_page((unsigned long)chsc_area);
355 return ret;
356}
357
358static int chsc_ioctl_info_channel_path(void __user *user_cd)
359{
360 struct chsc_chp_cd *cd;
361 int ret, ccode;
362 struct {
363 struct chsc_header request;
364 u32 : 2;
365 u32 m : 1;
366 u32 : 1;
367 u32 fmt1 : 4;
368 u32 cssid : 8;
369 u32 : 8;
370 u32 first_chpid : 8;
371 u32 : 24;
372 u32 last_chpid : 8;
373 u32 : 32;
374 struct chsc_header response;
375 u8 data[PAGE_SIZE - 20];
376 } __attribute__ ((packed)) *scpcd_area;
377
378 scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
379 if (!scpcd_area)
380 return -ENOMEM;
381 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
382 if (!cd) {
383 ret = -ENOMEM;
384 goto out_free;
385 }
386 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
387 ret = -EFAULT;
388 goto out_free;
389 }
390 scpcd_area->request.length = 0x0010;
391 scpcd_area->request.code = 0x0028;
392 scpcd_area->m = cd->m;
393 scpcd_area->fmt1 = cd->fmt;
394 scpcd_area->cssid = cd->chpid.cssid;
395 scpcd_area->first_chpid = cd->chpid.id;
396 scpcd_area->last_chpid = cd->chpid.id;
397
398 ccode = chsc(scpcd_area);
399 if (ccode != 0) {
400 ret = -EIO;
401 goto out_free;
402 }
403 if (scpcd_area->response.code != 0x0001) {
404 ret = -EIO;
405 CHSC_MSG(0, "scpcd: response code=%x\n",
406 scpcd_area->response.code);
407 goto out_free;
408 }
409 memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
410 if (copy_to_user(user_cd, cd, sizeof(*cd)))
411 ret = -EFAULT;
412 else
413 ret = 0;
414out_free:
415 kfree(cd);
416 free_page((unsigned long)scpcd_area);
417 return ret;
418}
419
420static int chsc_ioctl_info_cu(void __user *user_cd)
421{
422 struct chsc_cu_cd *cd;
423 int ret, ccode;
424 struct {
425 struct chsc_header request;
426 u32 : 2;
427 u32 m : 1;
428 u32 : 1;
429 u32 fmt1 : 4;
430 u32 cssid : 8;
431 u32 : 8;
432 u32 first_cun : 8;
433 u32 : 24;
434 u32 last_cun : 8;
435 u32 : 32;
436 struct chsc_header response;
437 u8 data[PAGE_SIZE - 20];
438 } __attribute__ ((packed)) *scucd_area;
439
440 scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
441 if (!scucd_area)
442 return -ENOMEM;
443 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
444 if (!cd) {
445 ret = -ENOMEM;
446 goto out_free;
447 }
448 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
449 ret = -EFAULT;
450 goto out_free;
451 }
452 scucd_area->request.length = 0x0010;
453 scucd_area->request.code = 0x0028;
454 scucd_area->m = cd->m;
455 scucd_area->fmt1 = cd->fmt;
456 scucd_area->cssid = cd->cssid;
457 scucd_area->first_cun = cd->cun;
458 scucd_area->last_cun = cd->cun;
459
460 ccode = chsc(scucd_area);
461 if (ccode != 0) {
462 ret = -EIO;
463 goto out_free;
464 }
465 if (scucd_area->response.code != 0x0001) {
466 ret = -EIO;
467 CHSC_MSG(0, "scucd: response code=%x\n",
468 scucd_area->response.code);
469 goto out_free;
470 }
471 memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
472 if (copy_to_user(user_cd, cd, sizeof(*cd)))
473 ret = -EFAULT;
474 else
475 ret = 0;
476out_free:
477 kfree(cd);
478 free_page((unsigned long)scucd_area);
479 return ret;
480}
481
482static int chsc_ioctl_info_sch_cu(void __user *user_cud)
483{
484 struct chsc_sch_cud *cud;
485 int ret, ccode;
486 struct {
487 struct chsc_header request;
488 u32 : 2;
489 u32 m : 1;
490 u32 : 5;
491 u32 fmt1 : 4;
492 u32 : 2;
493 u32 ssid : 2;
494 u32 first_sch : 16;
495 u32 : 8;
496 u32 cssid : 8;
497 u32 last_sch : 16;
498 u32 : 32;
499 struct chsc_header response;
500 u8 data[PAGE_SIZE - 20];
501 } __attribute__ ((packed)) *sscud_area;
502
503 sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
504 if (!sscud_area)
505 return -ENOMEM;
506 cud = kzalloc(sizeof(*cud), GFP_KERNEL);
507 if (!cud) {
508 ret = -ENOMEM;
509 goto out_free;
510 }
511 if (copy_from_user(cud, user_cud, sizeof(*cud))) {
512 ret = -EFAULT;
513 goto out_free;
514 }
515 sscud_area->request.length = 0x0010;
516 sscud_area->request.code = 0x0006;
517 sscud_area->m = cud->schid.m;
518 sscud_area->fmt1 = cud->fmt;
519 sscud_area->ssid = cud->schid.ssid;
520 sscud_area->first_sch = cud->schid.sch_no;
521 sscud_area->cssid = cud->schid.cssid;
522 sscud_area->last_sch = cud->schid.sch_no;
523
524 ccode = chsc(sscud_area);
525 if (ccode != 0) {
526 ret = -EIO;
527 goto out_free;
528 }
529 if (sscud_area->response.code != 0x0001) {
530 ret = -EIO;
531 CHSC_MSG(0, "sscud: response code=%x\n",
532 sscud_area->response.code);
533 goto out_free;
534 }
535 memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
536 if (copy_to_user(user_cud, cud, sizeof(*cud)))
537 ret = -EFAULT;
538 else
539 ret = 0;
540out_free:
541 kfree(cud);
542 free_page((unsigned long)sscud_area);
543 return ret;
544}
545
546static int chsc_ioctl_conf_info(void __user *user_ci)
547{
548 struct chsc_conf_info *ci;
549 int ret, ccode;
550 struct {
551 struct chsc_header request;
552 u32 : 2;
553 u32 m : 1;
554 u32 : 1;
555 u32 fmt1 : 4;
556 u32 cssid : 8;
557 u32 : 6;
558 u32 ssid : 2;
559 u32 : 8;
560 u64 : 64;
561 struct chsc_header response;
562 u8 data[PAGE_SIZE - 20];
563 } __attribute__ ((packed)) *sci_area;
564
565 sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
566 if (!sci_area)
567 return -ENOMEM;
568 ci = kzalloc(sizeof(*ci), GFP_KERNEL);
569 if (!ci) {
570 ret = -ENOMEM;
571 goto out_free;
572 }
573 if (copy_from_user(ci, user_ci, sizeof(*ci))) {
574 ret = -EFAULT;
575 goto out_free;
576 }
577 sci_area->request.length = 0x0010;
578 sci_area->request.code = 0x0012;
579 sci_area->m = ci->id.m;
580 sci_area->fmt1 = ci->fmt;
581 sci_area->cssid = ci->id.cssid;
582 sci_area->ssid = ci->id.ssid;
583
584 ccode = chsc(sci_area);
585 if (ccode != 0) {
586 ret = -EIO;
587 goto out_free;
588 }
589 if (sci_area->response.code != 0x0001) {
590 ret = -EIO;
591 CHSC_MSG(0, "sci: response code=%x\n",
592 sci_area->response.code);
593 goto out_free;
594 }
595 memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
596 if (copy_to_user(user_ci, ci, sizeof(*ci)))
597 ret = -EFAULT;
598 else
599 ret = 0;
600out_free:
601 kfree(ci);
602 free_page((unsigned long)sci_area);
603 return ret;
604}
605
606static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
607{
608 struct chsc_comp_list *ccl;
609 int ret, ccode;
610 struct {
611 struct chsc_header request;
612 u32 ctype : 8;
613 u32 : 4;
614 u32 fmt : 4;
615 u32 : 16;
616 u64 : 64;
617 u32 list_parm[2];
618 u64 : 64;
619 struct chsc_header response;
620 u8 data[PAGE_SIZE - 36];
621 } __attribute__ ((packed)) *sccl_area;
622 struct {
623 u32 m : 1;
624 u32 : 31;
625 u32 cssid : 8;
626 u32 : 16;
627 u32 chpid : 8;
628 } __attribute__ ((packed)) *chpid_parm;
629 struct {
630 u32 f_cssid : 8;
631 u32 l_cssid : 8;
632 u32 : 16;
633 u32 res;
634 } __attribute__ ((packed)) *cssids_parm;
635
636 sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
637 if (!sccl_area)
638 return -ENOMEM;
639 ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
640 if (!ccl) {
641 ret = -ENOMEM;
642 goto out_free;
643 }
644 if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
645 ret = -EFAULT;
646 goto out_free;
647 }
648 sccl_area->request.length = 0x0020;
649 sccl_area->request.code = 0x0030;
650 sccl_area->fmt = ccl->req.fmt;
651 sccl_area->ctype = ccl->req.ctype;
652 switch (sccl_area->ctype) {
653 case CCL_CU_ON_CHP:
654 case CCL_IOP_CHP:
655 chpid_parm = (void *)&sccl_area->list_parm;
656 chpid_parm->m = ccl->req.chpid.m;
657 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
658 chpid_parm->chpid = ccl->req.chpid.chp.id;
659 break;
660 case CCL_CSS_IMG:
661 case CCL_CSS_IMG_CONF_CHAR:
662 cssids_parm = (void *)&sccl_area->list_parm;
663 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
664 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
665 break;
666 }
667 ccode = chsc(sccl_area);
668 if (ccode != 0) {
669 ret = -EIO;
670 goto out_free;
671 }
672 if (sccl_area->response.code != 0x0001) {
673 ret = -EIO;
674 CHSC_MSG(0, "sccl: response code=%x\n",
675 sccl_area->response.code);
676 goto out_free;
677 }
678 memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
679 if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
680 ret = -EFAULT;
681 else
682 ret = 0;
683out_free:
684 kfree(ccl);
685 free_page((unsigned long)sccl_area);
686 return ret;
687}
688
689static int chsc_ioctl_chpd(void __user *user_chpd)
690{
691 struct chsc_cpd_info *chpd;
692 int ret;
693
694 chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
695 if (!chpd)
696 return -ENOMEM;
697 if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
698 ret = -EFAULT;
699 goto out_free;
700 }
701 ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
702 chpd->rfmt, chpd->c, chpd->m,
703 &chpd->chpdb);
704 if (ret)
705 goto out_free;
706 if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
707 ret = -EFAULT;
708out_free:
709 kfree(chpd);
710 return ret;
711}
712
713static int chsc_ioctl_dcal(void __user *user_dcal)
714{
715 struct chsc_dcal *dcal;
716 int ret, ccode;
717 struct {
718 struct chsc_header request;
719 u32 atype : 8;
720 u32 : 4;
721 u32 fmt : 4;
722 u32 : 16;
723 u32 res0[2];
724 u32 list_parm[2];
725 u32 res1[2];
726 struct chsc_header response;
727 u8 data[PAGE_SIZE - 36];
728 } __attribute__ ((packed)) *sdcal_area;
729
730 sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
731 if (!sdcal_area)
732 return -ENOMEM;
733 dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
734 if (!dcal) {
735 ret = -ENOMEM;
736 goto out_free;
737 }
738 if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
739 ret = -EFAULT;
740 goto out_free;
741 }
742 sdcal_area->request.length = 0x0020;
743 sdcal_area->request.code = 0x0034;
744 sdcal_area->atype = dcal->req.atype;
745 sdcal_area->fmt = dcal->req.fmt;
746 memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
747 sizeof(sdcal_area->list_parm));
748
749 ccode = chsc(sdcal_area);
750 if (ccode != 0) {
751 ret = -EIO;
752 goto out_free;
753 }
754 if (sdcal_area->response.code != 0x0001) {
755 ret = -EIO;
756 CHSC_MSG(0, "sdcal: response code=%x\n",
757 sdcal_area->response.code);
758 goto out_free;
759 }
760 memcpy(&dcal->sdcal, &sdcal_area->response,
761 sdcal_area->response.length);
762 if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
763 ret = -EFAULT;
764 else
765 ret = 0;
766out_free:
767 kfree(dcal);
768 free_page((unsigned long)sdcal_area);
769 return ret;
770}
771
772static long chsc_ioctl(struct file *filp, unsigned int cmd,
773 unsigned long arg)
774{
44ee6a85
HC		 775 void __user *argp;
776
9d92a7e1 777 CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
44ee6a85
HC		 778 if (is_compat_task())
779 argp = compat_ptr(arg);
780 else
781 argp = (void __user *)arg;
9d92a7e1
CH		 782 switch (cmd) {
783 case CHSC_START:
44ee6a85 784 return chsc_ioctl_start(argp);
9d92a7e1 785 case CHSC_INFO_CHANNEL_PATH:
44ee6a85 786 return chsc_ioctl_info_channel_path(argp);
9d92a7e1 787 case CHSC_INFO_CU:
44ee6a85 788 return chsc_ioctl_info_cu(argp);
9d92a7e1 789 case CHSC_INFO_SCH_CU:
44ee6a85 790 return chsc_ioctl_info_sch_cu(argp);
9d92a7e1 791 case CHSC_INFO_CI:
44ee6a85 792 return chsc_ioctl_conf_info(argp);
9d92a7e1 793 case CHSC_INFO_CCL:
44ee6a85 794 return chsc_ioctl_conf_comp_list(argp);
9d92a7e1 795 case CHSC_INFO_CPD:
44ee6a85 796 return chsc_ioctl_chpd(argp);
9d92a7e1 797 case CHSC_INFO_DCAL:
44ee6a85 798 return chsc_ioctl_dcal(argp);
9d92a7e1
CH		 799 default: /* unknown ioctl number */
800 return -ENOIOCTLCMD;
801 }
802}
803
804static const struct file_operations chsc_fops = {
805 .owner = THIS_MODULE,
58ea91c0 806 .open = nonseekable_open,
9d92a7e1
CH		 807 .unlocked_ioctl = chsc_ioctl,
808 .compat_ioctl = chsc_ioctl,
809};
810
811static struct miscdevice chsc_misc_device = {
812 .minor = MISC_DYNAMIC_MINOR,
813 .name = "chsc",
814 .fops = &chsc_fops,
815};
816
817static int __init chsc_misc_init(void)
818{
819 return misc_register(&chsc_misc_device);
820}
821
822static void chsc_misc_cleanup(void)
823{
824 misc_deregister(&chsc_misc_device);
825}
826
827static int __init chsc_sch_init(void)
828{
829 int ret;
830
831 ret = chsc_init_dbfs();
832 if (ret)
833 return ret;
834 isc_register(CHSC_SCH_ISC);
835 ret = chsc_init_sch_driver();
836 if (ret)
837 goto out_dbf;
838 ret = chsc_misc_init();
839 if (ret)
840 goto out_driver;
841 return ret;
842out_driver:
843 chsc_cleanup_sch_driver();
844out_dbf:
845 isc_unregister(CHSC_SCH_ISC);
846 chsc_remove_dbfs();
847 return ret;
848}
849
850static void __exit chsc_sch_exit(void)
851{
852 chsc_misc_cleanup();
853 chsc_cleanup_sch_driver();
854 isc_unregister(CHSC_SCH_ISC);
855 chsc_remove_dbfs();
856}
857
858module_init(chsc_sch_init);
859module_exit(chsc_sch_exit);
Linux 6.x block layer and io_uring tree(s)