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