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_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;
 708 out_free:
 709         kfree(chpd);
 710         return ret;
 711 }
 712
 713 static 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;
 766 out_free:
 767         kfree(dcal);
 768         free_page((unsigned long)sdcal_area);
 769         return ret;
 770 }
 771
 772 static long chsc_ioctl(struct file *filp, unsigned int cmd,
 773                        unsigned long arg)
 774 {
 775         void __user *argp;
 776
 777         CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
 778         if (is_compat_task())
 779                 argp = compat_ptr(arg);
 780         else
 781                 argp = (void __user *)arg;
 782         switch (cmd) {
 783         case CHSC_START:
 784                 return chsc_ioctl_start(argp);
 785         case CHSC_INFO_CHANNEL_PATH:
 786                 return chsc_ioctl_info_channel_path(argp);
 787         case CHSC_INFO_CU:
 788                 return chsc_ioctl_info_cu(argp);
 789         case CHSC_INFO_SCH_CU:
 790                 return chsc_ioctl_info_sch_cu(argp);
 791         case CHSC_INFO_CI:
 792                 return chsc_ioctl_conf_info(argp);
 793         case CHSC_INFO_CCL:
 794                 return chsc_ioctl_conf_comp_list(argp);
 795         case CHSC_INFO_CPD:
 796                 return chsc_ioctl_chpd(argp);
 797         case CHSC_INFO_DCAL:
 798                 return chsc_ioctl_dcal(argp);
 799         default: /* unknown ioctl number */
 800                 return -ENOIOCTLCMD;
 801         }
 802 }
 803
 804 static const struct file_operations chsc_fops = {
 805         .owner = THIS_MODULE,
 806         .open = nonseekable_open,
 807         .unlocked_ioctl = chsc_ioctl,
 808         .compat_ioctl = chsc_ioctl,
 809 };
 810
 811 static struct miscdevice chsc_misc_device = {
 812         .minor = MISC_DYNAMIC_MINOR,
 813         .name = "chsc",
 814         .fops = &chsc_fops,
 815 };
 816
 817 static int __init chsc_misc_init(void)
 818 {
 819         return misc_register(&chsc_misc_device);
 820 }
 821
 822 static void chsc_misc_cleanup(void)
 823 {
 824         misc_deregister(&chsc_misc_device);
 825 }
 826
 827 static 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;
 842 out_driver:
 843         chsc_cleanup_sch_driver();
 844 out_dbf:
 845         isc_unregister(CHSC_SCH_ISC);
 846         chsc_remove_dbfs();
 847         return ret;
 848 }
 849
 850 static 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
 858 module_init(chsc_sch_init);
 859 module_exit(chsc_sch_exit);