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[S390] chsc: use the global page to determine the chp desriptor
[~shefty/rdma-dev.git] / drivers / s390 / cio / chsc_sch.c
1 /*
2  * Driver for s390 chsc subchannels
3  *
4  * Copyright IBM Corp. 2008, 2009
5  *
6  * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
7  *
8  */
9
10 #include <linux/slab.h>
11 #include <linux/device.h>
12 #include <linux/module.h>
13 #include <linux/uaccess.h>
14 #include <linux/miscdevice.h>
15
16 #include <asm/compat.h>
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
27 static debug_info_t *chsc_debug_msg_id;
28 static 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
38 static 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
47 MODULE_AUTHOR("IBM Corporation");
48 MODULE_DESCRIPTION("driver for s390 chsc subchannels");
49 MODULE_LICENSE("GPL");
50
51 static void chsc_subchannel_irq(struct subchannel *sch)
52 {
53         struct chsc_private *private = sch->private;
54         struct chsc_request *request = private->request;
55         struct irb *irb = (struct irb *)&S390_lowcore.irb;
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));
67         cio_update_schib(sch);
68         complete(&request->completion);
69         put_device(&sch->dev);
70 }
71
72 static 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;
90                 if (dev_get_uevent_suppress(&sch->dev)) {
91                         dev_set_uevent_suppress(&sch->dev, 0);
92                         kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
93                 }
94         }
95         return ret;
96 }
97
98 static 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
113 static void chsc_subchannel_shutdown(struct subchannel *sch)
114 {
115         cio_disable_subchannel(sch);
116 }
117
118 static 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          */
127         cc = stsch_err(sch->schid, &schib);
128         if (!cc && scsw_stctl(&schib.scsw))
129                 return -EAGAIN;
130         return 0;
131 }
132
133 static int chsc_subchannel_freeze(struct subchannel *sch)
134 {
135         return cio_disable_subchannel(sch);
136 }
137
138 static int chsc_subchannel_restore(struct subchannel *sch)
139 {
140         return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
141 }
142
143 static struct css_device_id chsc_subchannel_ids[] = {
144         { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
145         { /* end of list */ },
146 };
147 MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
148
149 static 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,
156         .prepare = chsc_subchannel_prepare,
157         .freeze = chsc_subchannel_freeze,
158         .thaw = chsc_subchannel_restore,
159         .restore = chsc_subchannel_restore,
160         .name = "chsc_subchannel",
161 };
162
163 static 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;
177 out:
178         if (chsc_debug_msg_id)
179                 debug_unregister(chsc_debug_msg_id);
180         return -ENOMEM;
181 }
182
183 static void chsc_remove_dbfs(void)
184 {
185         debug_unregister(chsc_debug_log_id);
186         debug_unregister(chsc_debug_msg_id);
187 }
188
189 static int __init chsc_init_sch_driver(void)
190 {
191         return css_driver_register(&chsc_subchannel_driver);
192 }
193
194 static void chsc_cleanup_sch_driver(void)
195 {
196         css_driver_unregister(&chsc_subchannel_driver);
197 }
198
199 static DEFINE_SPINLOCK(chsc_lock);
200
201 static 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
208 static 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  */
232 static 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
241         chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
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
283 static 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
292 static int chsc_examine_irb(struct chsc_request *request)
293 {
294         int backed_up;
295
296         if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
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
315 static 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;
350 out_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
358 static 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;
414 out_free:
415         kfree(cd);
416         free_page((unsigned long)scpcd_area);
417         return ret;
418 }
419
420 static 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;
476 out_free:
477         kfree(cd);
478         free_page((unsigned long)scucd_area);
479         return ret;
480 }
481
482 static 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;
540 out_free:
541         kfree(cud);
542         free_page((unsigned long)sscud_area);
543         return ret;
544 }
545
546 static 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;
600 out_free:
601         kfree(ci);
602         free_page((unsigned long)sci_area);
603         return ret;
604 }
605
606 static 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;
683 out_free:
684         kfree(ccl);
685         free_page((unsigned long)sccl_area);
686         return ret;
687 }
688
689 static int chsc_ioctl_chpd(void __user *user_chpd)
690 {
691         struct chsc_scpd *scpd_area;
692         struct chsc_cpd_info *chpd;
693         int ret;
694
695         chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
696         scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
697         if (!scpd_area || !chpd) {
698                 ret = -ENOMEM;
699                 goto out_free;
700         }
701         if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
702                 ret = -EFAULT;
703                 goto out_free;
704         }
705         ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
706                                                chpd->rfmt, chpd->c, chpd->m,
707                                                scpd_area);
708         if (ret)
709                 goto out_free;
710         memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
711         if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
712                 ret = -EFAULT;
713 out_free:
714         kfree(chpd);
715         free_page((unsigned long)scpd_area);
716         return ret;
717 }
718
719 static int chsc_ioctl_dcal(void __user *user_dcal)
720 {
721         struct chsc_dcal *dcal;
722         int ret, ccode;
723         struct {
724                 struct chsc_header request;
725                 u32 atype : 8;
726                 u32 : 4;
727                 u32 fmt : 4;
728                 u32 : 16;
729                 u32 res0[2];
730                 u32 list_parm[2];
731                 u32 res1[2];
732                 struct chsc_header response;
733                 u8 data[PAGE_SIZE - 36];
734         } __attribute__ ((packed)) *sdcal_area;
735
736         sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
737         if (!sdcal_area)
738                 return -ENOMEM;
739         dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
740         if (!dcal) {
741                 ret = -ENOMEM;
742                 goto out_free;
743         }
744         if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
745                 ret = -EFAULT;
746                 goto out_free;
747         }
748         sdcal_area->request.length = 0x0020;
749         sdcal_area->request.code = 0x0034;
750         sdcal_area->atype = dcal->req.atype;
751         sdcal_area->fmt = dcal->req.fmt;
752         memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
753                sizeof(sdcal_area->list_parm));
754
755         ccode = chsc(sdcal_area);
756         if (ccode != 0) {
757                 ret = -EIO;
758                 goto out_free;
759         }
760         if (sdcal_area->response.code != 0x0001) {
761                 ret = -EIO;
762                 CHSC_MSG(0, "sdcal: response code=%x\n",
763                          sdcal_area->response.code);
764                 goto out_free;
765         }
766         memcpy(&dcal->sdcal, &sdcal_area->response,
767                sdcal_area->response.length);
768         if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
769                 ret = -EFAULT;
770         else
771                 ret = 0;
772 out_free:
773         kfree(dcal);
774         free_page((unsigned long)sdcal_area);
775         return ret;
776 }
777
778 static long chsc_ioctl(struct file *filp, unsigned int cmd,
779                        unsigned long arg)
780 {
781         void __user *argp;
782
783         CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
784         if (is_compat_task())
785                 argp = compat_ptr(arg);
786         else
787                 argp = (void __user *)arg;
788         switch (cmd) {
789         case CHSC_START:
790                 return chsc_ioctl_start(argp);
791         case CHSC_INFO_CHANNEL_PATH:
792                 return chsc_ioctl_info_channel_path(argp);
793         case CHSC_INFO_CU:
794                 return chsc_ioctl_info_cu(argp);
795         case CHSC_INFO_SCH_CU:
796                 return chsc_ioctl_info_sch_cu(argp);
797         case CHSC_INFO_CI:
798                 return chsc_ioctl_conf_info(argp);
799         case CHSC_INFO_CCL:
800                 return chsc_ioctl_conf_comp_list(argp);
801         case CHSC_INFO_CPD:
802                 return chsc_ioctl_chpd(argp);
803         case CHSC_INFO_DCAL:
804                 return chsc_ioctl_dcal(argp);
805         default: /* unknown ioctl number */
806                 return -ENOIOCTLCMD;
807         }
808 }
809
810 static const struct file_operations chsc_fops = {
811         .owner = THIS_MODULE,
812         .open = nonseekable_open,
813         .unlocked_ioctl = chsc_ioctl,
814         .compat_ioctl = chsc_ioctl,
815         .llseek = no_llseek,
816 };
817
818 static struct miscdevice chsc_misc_device = {
819         .minor = MISC_DYNAMIC_MINOR,
820         .name = "chsc",
821         .fops = &chsc_fops,
822 };
823
824 static int __init chsc_misc_init(void)
825 {
826         return misc_register(&chsc_misc_device);
827 }
828
829 static void chsc_misc_cleanup(void)
830 {
831         misc_deregister(&chsc_misc_device);
832 }
833
834 static int __init chsc_sch_init(void)
835 {
836         int ret;
837
838         ret = chsc_init_dbfs();
839         if (ret)
840                 return ret;
841         isc_register(CHSC_SCH_ISC);
842         ret = chsc_init_sch_driver();
843         if (ret)
844                 goto out_dbf;
845         ret = chsc_misc_init();
846         if (ret)
847                 goto out_driver;
848         return ret;
849 out_driver:
850         chsc_cleanup_sch_driver();
851 out_dbf:
852         isc_unregister(CHSC_SCH_ISC);
853         chsc_remove_dbfs();
854         return ret;
855 }
856
857 static void __exit chsc_sch_exit(void)
858 {
859         chsc_misc_cleanup();
860         chsc_cleanup_sch_driver();
861         isc_unregister(CHSC_SCH_ISC);
862         chsc_remove_dbfs();
863 }
864
865 module_init(chsc_sch_init);
866 module_exit(chsc_sch_exit);