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 = dev_get_drvdata(&sch->dev);
  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         dev_set_drvdata(&sch->dev, private);
  84         ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
  85         if (ret) {
  86                 CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
  87                          sch->schid.ssid, sch->schid.sch_no, ret);
  88                 dev_set_drvdata(&sch->dev, NULL);
  89                 kfree(private);
  90         } else {
  91                 if (dev_get_uevent_suppress(&sch->dev)) {
  92                         dev_set_uevent_suppress(&sch->dev, 0);
  93                         kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
  94                 }
  95         }
  96         return ret;
  97 }
  98
  99 static int chsc_subchannel_remove(struct subchannel *sch)
 100 {
 101         struct chsc_private *private;
 102
 103         cio_disable_subchannel(sch);
 104         private = dev_get_drvdata(&sch->dev);
 105         dev_set_drvdata(&sch->dev, NULL);
 106         if (private->request) {
 107                 complete(&private->request->completion);
 108                 put_device(&sch->dev);
 109         }
 110         kfree(private);
 111         return 0;
 112 }
 113
 114 static void chsc_subchannel_shutdown(struct subchannel *sch)
 115 {
 116         cio_disable_subchannel(sch);
 117 }
 118
 119 static int chsc_subchannel_prepare(struct subchannel *sch)
 120 {
 121         int cc;
 122         struct schib schib;
 123         /*
 124          * Don't allow suspend while the subchannel is not idle
 125          * since we don't have a way to clear the subchannel and
 126          * cannot disable it with a request running.
 127          */
 128         cc = stsch_err(sch->schid, &schib);
 129         if (!cc && scsw_stctl(&schib.scsw))
 130                 return -EAGAIN;
 131         return 0;
 132 }
 133
 134 static int chsc_subchannel_freeze(struct subchannel *sch)
 135 {
 136         return cio_disable_subchannel(sch);
 137 }
 138
 139 static int chsc_subchannel_restore(struct subchannel *sch)
 140 {
 141         return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
 142 }
 143
 144 static struct css_device_id chsc_subchannel_ids[] = {
 145         { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
 146         { /* end of list */ },
 147 };
 148 MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
 149
 150 static struct css_driver chsc_subchannel_driver = {
 151         .owner = THIS_MODULE,
 152         .subchannel_type = chsc_subchannel_ids,
 153         .irq = chsc_subchannel_irq,
 154         .probe = chsc_subchannel_probe,
 155         .remove = chsc_subchannel_remove,
 156         .shutdown = chsc_subchannel_shutdown,
 157         .prepare = chsc_subchannel_prepare,
 158         .freeze = chsc_subchannel_freeze,
 159         .thaw = chsc_subchannel_restore,
 160         .restore = chsc_subchannel_restore,
 161         .name = "chsc_subchannel",
 162 };
 163
 164 static int __init chsc_init_dbfs(void)
 165 {
 166         chsc_debug_msg_id = debug_register("chsc_msg", 16, 1,
 167                                            16 * sizeof(long));
 168         if (!chsc_debug_msg_id)
 169                 goto out;
 170         debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
 171         debug_set_level(chsc_debug_msg_id, 2);
 172         chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
 173         if (!chsc_debug_log_id)
 174                 goto out;
 175         debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
 176         debug_set_level(chsc_debug_log_id, 2);
 177         return 0;
 178 out:
 179         if (chsc_debug_msg_id)
 180                 debug_unregister(chsc_debug_msg_id);
 181         return -ENOMEM;
 182 }
 183
 184 static void chsc_remove_dbfs(void)
 185 {
 186         debug_unregister(chsc_debug_log_id);
 187         debug_unregister(chsc_debug_msg_id);
 188 }
 189
 190 static int __init chsc_init_sch_driver(void)
 191 {
 192         return css_driver_register(&chsc_subchannel_driver);
 193 }
 194
 195 static void chsc_cleanup_sch_driver(void)
 196 {
 197         css_driver_unregister(&chsc_subchannel_driver);
 198 }
 199
 200 static DEFINE_SPINLOCK(chsc_lock);
 201
 202 static int chsc_subchannel_match_next_free(struct device *dev, void *data)
 203 {
 204         struct subchannel *sch = to_subchannel(dev);
 205
 206         return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
 207 }
 208
 209 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
 210 {
 211         struct device *dev;
 212
 213         dev = driver_find_device(&chsc_subchannel_driver.drv,
 214                                  sch ? &sch->dev : NULL, NULL,
 215                                  chsc_subchannel_match_next_free);
 216         return dev ? to_subchannel(dev) : NULL;
 217 }
 218
 219 /**
 220  * chsc_async() - try to start a chsc request asynchronously
 221  * @chsc_area: request to be started
 222  * @request: request structure to associate
 223  *
 224  * Tries to start a chsc request on one of the existing chsc subchannels.
 225  * Returns:
 226  *  %0 if the request was performed synchronously
 227  *  %-EINPROGRESS if the request was successfully started
 228  *  %-EBUSY if all chsc subchannels are busy
 229  *  %-ENODEV if no chsc subchannels are available
 230  * Context:
 231  *  interrupts disabled, chsc_lock held
 232  */
 233 static int chsc_async(struct chsc_async_area *chsc_area,
 234                       struct chsc_request *request)
 235 {
 236         int cc;
 237         struct chsc_private *private;
 238         struct subchannel *sch = NULL;
 239         int ret = -ENODEV;
 240         char dbf[10];
 241
 242         chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
 243         while ((sch = chsc_get_next_subchannel(sch))) {
 244                 spin_lock(sch->lock);
 245                 private = dev_get_drvdata(&sch->dev);
 246                 if (private->request) {
 247                         spin_unlock(sch->lock);
 248                         ret = -EBUSY;
 249                         continue;
 250                 }
 251                 chsc_area->header.sid = sch->schid;
 252                 CHSC_LOG(2, "schid");
 253                 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
 254                 cc = chsc(chsc_area);
 255                 sprintf(dbf, "cc:%d", cc);
 256                 CHSC_LOG(2, dbf);
 257                 switch (cc) {
 258                 case 0:
 259                         ret = 0;
 260                         break;
 261                 case 1:
 262                         sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
 263                         ret = -EINPROGRESS;
 264                         private->request = request;
 265                         break;
 266                 case 2:
 267                         ret = -EBUSY;
 268                         break;
 269                 default:
 270                         ret = -ENODEV;
 271                 }
 272                 spin_unlock(sch->lock);
 273                 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
 274                          sch->schid.ssid, sch->schid.sch_no, cc);
 275                 if (ret == -EINPROGRESS)
 276                         return -EINPROGRESS;
 277                 put_device(&sch->dev);
 278                 if (ret == 0)
 279                         return 0;
 280         }
 281         return ret;
 282 }
 283
 284 static void chsc_log_command(struct chsc_async_area *chsc_area)
 285 {
 286         char dbf[10];
 287
 288         sprintf(dbf, "CHSC:%x", chsc_area->header.code);
 289         CHSC_LOG(0, dbf);
 290         CHSC_LOG_HEX(0, chsc_area, 32);
 291 }
 292
 293 static int chsc_examine_irb(struct chsc_request *request)
 294 {
 295         int backed_up;
 296
 297         if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
 298                 return -EIO;
 299         backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
 300         request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
 301         if (scsw_cstat(&request->irb.scsw) == 0)
 302                 return 0;
 303         if (!backed_up)
 304                 return 0;
 305         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
 306                 return -EIO;
 307         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
 308                 return -EPERM;
 309         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
 310                 return -EAGAIN;
 311         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
 312                 return -EAGAIN;
 313         return -EIO;
 314 }
 315
 316 static int chsc_ioctl_start(void __user *user_area)
 317 {
 318         struct chsc_request *request;
 319         struct chsc_async_area *chsc_area;
 320         int ret;
 321         char dbf[10];
 322
 323         if (!css_general_characteristics.dynio)
 324                 /* It makes no sense to try. */
 325                 return -EOPNOTSUPP;
 326         chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
 327         if (!chsc_area)
 328                 return -ENOMEM;
 329         request = kzalloc(sizeof(*request), GFP_KERNEL);
 330         if (!request) {
 331                 ret = -ENOMEM;
 332                 goto out_free;
 333         }
 334         init_completion(&request->completion);
 335         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 336                 ret = -EFAULT;
 337                 goto out_free;
 338         }
 339         chsc_log_command(chsc_area);
 340         spin_lock_irq(&chsc_lock);
 341         ret = chsc_async(chsc_area, request);
 342         spin_unlock_irq(&chsc_lock);
 343         if (ret == -EINPROGRESS) {
 344                 wait_for_completion(&request->completion);
 345                 ret = chsc_examine_irb(request);
 346         }
 347         /* copy area back to user */
 348         if (!ret)
 349                 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 350                         ret = -EFAULT;
 351 out_free:
 352         sprintf(dbf, "ret:%d", ret);
 353         CHSC_LOG(0, dbf);
 354         kfree(request);
 355         free_page((unsigned long)chsc_area);
 356         return ret;
 357 }
 358
 359 static int chsc_ioctl_info_channel_path(void __user *user_cd)
 360 {
 361         struct chsc_chp_cd *cd;
 362         int ret, ccode;
 363         struct {
 364                 struct chsc_header request;
 365                 u32 : 2;
 366                 u32 m : 1;
 367                 u32 : 1;
 368                 u32 fmt1 : 4;
 369                 u32 cssid : 8;
 370                 u32 : 8;
 371                 u32 first_chpid : 8;
 372                 u32 : 24;
 373                 u32 last_chpid : 8;
 374                 u32 : 32;
 375                 struct chsc_header response;
 376                 u8 data[PAGE_SIZE - 20];
 377         } __attribute__ ((packed)) *scpcd_area;
 378
 379         scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 380         if (!scpcd_area)
 381                 return -ENOMEM;
 382         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 383         if (!cd) {
 384                 ret = -ENOMEM;
 385                 goto out_free;
 386         }
 387         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 388                 ret = -EFAULT;
 389                 goto out_free;
 390         }
 391         scpcd_area->request.length = 0x0010;
 392         scpcd_area->request.code = 0x0028;
 393         scpcd_area->m = cd->m;
 394         scpcd_area->fmt1 = cd->fmt;
 395         scpcd_area->cssid = cd->chpid.cssid;
 396         scpcd_area->first_chpid = cd->chpid.id;
 397         scpcd_area->last_chpid = cd->chpid.id;
 398
 399         ccode = chsc(scpcd_area);
 400         if (ccode != 0) {
 401                 ret = -EIO;
 402                 goto out_free;
 403         }
 404         if (scpcd_area->response.code != 0x0001) {
 405                 ret = -EIO;
 406                 CHSC_MSG(0, "scpcd: response code=%x\n",
 407                          scpcd_area->response.code);
 408                 goto out_free;
 409         }
 410         memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
 411         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 412                 ret = -EFAULT;
 413         else
 414                 ret = 0;
 415 out_free:
 416         kfree(cd);
 417         free_page((unsigned long)scpcd_area);
 418         return ret;
 419 }
 420
 421 static int chsc_ioctl_info_cu(void __user *user_cd)
 422 {
 423         struct chsc_cu_cd *cd;
 424         int ret, ccode;
 425         struct {
 426                 struct chsc_header request;
 427                 u32 : 2;
 428                 u32 m : 1;
 429                 u32 : 1;
 430                 u32 fmt1 : 4;
 431                 u32 cssid : 8;
 432                 u32 : 8;
 433                 u32 first_cun : 8;
 434                 u32 : 24;
 435                 u32 last_cun : 8;
 436                 u32 : 32;
 437                 struct chsc_header response;
 438                 u8 data[PAGE_SIZE - 20];
 439         } __attribute__ ((packed)) *scucd_area;
 440
 441         scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 442         if (!scucd_area)
 443                 return -ENOMEM;
 444         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 445         if (!cd) {
 446                 ret = -ENOMEM;
 447                 goto out_free;
 448         }
 449         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 450                 ret = -EFAULT;
 451                 goto out_free;
 452         }
 453         scucd_area->request.length = 0x0010;
 454         scucd_area->request.code = 0x0028;
 455         scucd_area->m = cd->m;
 456         scucd_area->fmt1 = cd->fmt;
 457         scucd_area->cssid = cd->cssid;
 458         scucd_area->first_cun = cd->cun;
 459         scucd_area->last_cun = cd->cun;
 460
 461         ccode = chsc(scucd_area);
 462         if (ccode != 0) {
 463                 ret = -EIO;
 464                 goto out_free;
 465         }
 466         if (scucd_area->response.code != 0x0001) {
 467                 ret = -EIO;
 468                 CHSC_MSG(0, "scucd: response code=%x\n",
 469                          scucd_area->response.code);
 470                 goto out_free;
 471         }
 472         memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
 473         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 474                 ret = -EFAULT;
 475         else
 476                 ret = 0;
 477 out_free:
 478         kfree(cd);
 479         free_page((unsigned long)scucd_area);
 480         return ret;
 481 }
 482
 483 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
 484 {
 485         struct chsc_sch_cud *cud;
 486         int ret, ccode;
 487         struct {
 488                 struct chsc_header request;
 489                 u32 : 2;
 490                 u32 m : 1;
 491                 u32 : 5;
 492                 u32 fmt1 : 4;
 493                 u32 : 2;
 494                 u32 ssid : 2;
 495                 u32 first_sch : 16;
 496                 u32 : 8;
 497                 u32 cssid : 8;
 498                 u32 last_sch : 16;
 499                 u32 : 32;
 500                 struct chsc_header response;
 501                 u8 data[PAGE_SIZE - 20];
 502         } __attribute__ ((packed)) *sscud_area;
 503
 504         sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 505         if (!sscud_area)
 506                 return -ENOMEM;
 507         cud = kzalloc(sizeof(*cud), GFP_KERNEL);
 508         if (!cud) {
 509                 ret = -ENOMEM;
 510                 goto out_free;
 511         }
 512         if (copy_from_user(cud, user_cud, sizeof(*cud))) {
 513                 ret = -EFAULT;
 514                 goto out_free;
 515         }
 516         sscud_area->request.length = 0x0010;
 517         sscud_area->request.code = 0x0006;
 518         sscud_area->m = cud->schid.m;
 519         sscud_area->fmt1 = cud->fmt;
 520         sscud_area->ssid = cud->schid.ssid;
 521         sscud_area->first_sch = cud->schid.sch_no;
 522         sscud_area->cssid = cud->schid.cssid;
 523         sscud_area->last_sch = cud->schid.sch_no;
 524
 525         ccode = chsc(sscud_area);
 526         if (ccode != 0) {
 527                 ret = -EIO;
 528                 goto out_free;
 529         }
 530         if (sscud_area->response.code != 0x0001) {
 531                 ret = -EIO;
 532                 CHSC_MSG(0, "sscud: response code=%x\n",
 533                          sscud_area->response.code);
 534                 goto out_free;
 535         }
 536         memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
 537         if (copy_to_user(user_cud, cud, sizeof(*cud)))
 538                 ret = -EFAULT;
 539         else
 540                 ret = 0;
 541 out_free:
 542         kfree(cud);
 543         free_page((unsigned long)sscud_area);
 544         return ret;
 545 }
 546
 547 static int chsc_ioctl_conf_info(void __user *user_ci)
 548 {
 549         struct chsc_conf_info *ci;
 550         int ret, ccode;
 551         struct {
 552                 struct chsc_header request;
 553                 u32 : 2;
 554                 u32 m : 1;
 555                 u32 : 1;
 556                 u32 fmt1 : 4;
 557                 u32 cssid : 8;
 558                 u32 : 6;
 559                 u32 ssid : 2;
 560                 u32 : 8;
 561                 u64 : 64;
 562                 struct chsc_header response;
 563                 u8 data[PAGE_SIZE - 20];
 564         } __attribute__ ((packed)) *sci_area;
 565
 566         sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 567         if (!sci_area)
 568                 return -ENOMEM;
 569         ci = kzalloc(sizeof(*ci), GFP_KERNEL);
 570         if (!ci) {
 571                 ret = -ENOMEM;
 572                 goto out_free;
 573         }
 574         if (copy_from_user(ci, user_ci, sizeof(*ci))) {
 575                 ret = -EFAULT;
 576                 goto out_free;
 577         }
 578         sci_area->request.length = 0x0010;
 579         sci_area->request.code = 0x0012;
 580         sci_area->m = ci->id.m;
 581         sci_area->fmt1 = ci->fmt;
 582         sci_area->cssid = ci->id.cssid;
 583         sci_area->ssid = ci->id.ssid;
 584
 585         ccode = chsc(sci_area);
 586         if (ccode != 0) {
 587                 ret = -EIO;
 588                 goto out_free;
 589         }
 590         if (sci_area->response.code != 0x0001) {
 591                 ret = -EIO;
 592                 CHSC_MSG(0, "sci: response code=%x\n",
 593                          sci_area->response.code);
 594                 goto out_free;
 595         }
 596         memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
 597         if (copy_to_user(user_ci, ci, sizeof(*ci)))
 598                 ret = -EFAULT;
 599         else
 600                 ret = 0;
 601 out_free:
 602         kfree(ci);
 603         free_page((unsigned long)sci_area);
 604         return ret;
 605 }
 606
 607 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
 608 {
 609         struct chsc_comp_list *ccl;
 610         int ret, ccode;
 611         struct {
 612                 struct chsc_header request;
 613                 u32 ctype : 8;
 614                 u32 : 4;
 615                 u32 fmt : 4;
 616                 u32 : 16;
 617                 u64 : 64;
 618                 u32 list_parm[2];
 619                 u64 : 64;
 620                 struct chsc_header response;
 621                 u8 data[PAGE_SIZE - 36];
 622         } __attribute__ ((packed)) *sccl_area;
 623         struct {
 624                 u32 m : 1;
 625                 u32 : 31;
 626                 u32 cssid : 8;
 627                 u32 : 16;
 628                 u32 chpid : 8;
 629         } __attribute__ ((packed)) *chpid_parm;
 630         struct {
 631                 u32 f_cssid : 8;
 632                 u32 l_cssid : 8;
 633                 u32 : 16;
 634                 u32 res;
 635         } __attribute__ ((packed)) *cssids_parm;
 636
 637         sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 638         if (!sccl_area)
 639                 return -ENOMEM;
 640         ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
 641         if (!ccl) {
 642                 ret = -ENOMEM;
 643                 goto out_free;
 644         }
 645         if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
 646                 ret = -EFAULT;
 647                 goto out_free;
 648         }
 649         sccl_area->request.length = 0x0020;
 650         sccl_area->request.code = 0x0030;
 651         sccl_area->fmt = ccl->req.fmt;
 652         sccl_area->ctype = ccl->req.ctype;
 653         switch (sccl_area->ctype) {
 654         case CCL_CU_ON_CHP:
 655         case CCL_IOP_CHP:
 656                 chpid_parm = (void *)&sccl_area->list_parm;
 657                 chpid_parm->m = ccl->req.chpid.m;
 658                 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
 659                 chpid_parm->chpid = ccl->req.chpid.chp.id;
 660                 break;
 661         case CCL_CSS_IMG:
 662         case CCL_CSS_IMG_CONF_CHAR:
 663                 cssids_parm = (void *)&sccl_area->list_parm;
 664                 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
 665                 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
 666                 break;
 667         }
 668         ccode = chsc(sccl_area);
 669         if (ccode != 0) {
 670                 ret = -EIO;
 671                 goto out_free;
 672         }
 673         if (sccl_area->response.code != 0x0001) {
 674                 ret = -EIO;
 675                 CHSC_MSG(0, "sccl: response code=%x\n",
 676                          sccl_area->response.code);
 677                 goto out_free;
 678         }
 679         memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
 680         if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
 681                 ret = -EFAULT;
 682         else
 683                 ret = 0;
 684 out_free:
 685         kfree(ccl);
 686         free_page((unsigned long)sccl_area);
 687         return ret;
 688 }
 689
 690 static int chsc_ioctl_chpd(void __user *user_chpd)
 691 {
 692         struct chsc_scpd *scpd_area;
 693         struct chsc_cpd_info *chpd;
 694         int ret;
 695
 696         chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
 697         scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 698         if (!scpd_area || !chpd) {
 699                 ret = -ENOMEM;
 700                 goto out_free;
 701         }
 702         if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
 703                 ret = -EFAULT;
 704                 goto out_free;
 705         }
 706         ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
 707                                                chpd->rfmt, chpd->c, chpd->m,
 708                                                scpd_area);
 709         if (ret)
 710                 goto out_free;
 711         memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
 712         if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
 713                 ret = -EFAULT;
 714 out_free:
 715         kfree(chpd);
 716         free_page((unsigned long)scpd_area);
 717         return ret;
 718 }
 719
 720 static int chsc_ioctl_dcal(void __user *user_dcal)
 721 {
 722         struct chsc_dcal *dcal;
 723         int ret, ccode;
 724         struct {
 725                 struct chsc_header request;
 726                 u32 atype : 8;
 727                 u32 : 4;
 728                 u32 fmt : 4;
 729                 u32 : 16;
 730                 u32 res0[2];
 731                 u32 list_parm[2];
 732                 u32 res1[2];
 733                 struct chsc_header response;
 734                 u8 data[PAGE_SIZE - 36];
 735         } __attribute__ ((packed)) *sdcal_area;
 736
 737         sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 738         if (!sdcal_area)
 739                 return -ENOMEM;
 740         dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
 741         if (!dcal) {
 742                 ret = -ENOMEM;
 743                 goto out_free;
 744         }
 745         if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
 746                 ret = -EFAULT;
 747                 goto out_free;
 748         }
 749         sdcal_area->request.length = 0x0020;
 750         sdcal_area->request.code = 0x0034;
 751         sdcal_area->atype = dcal->req.atype;
 752         sdcal_area->fmt = dcal->req.fmt;
 753         memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
 754                sizeof(sdcal_area->list_parm));
 755
 756         ccode = chsc(sdcal_area);
 757         if (ccode != 0) {
 758                 ret = -EIO;
 759                 goto out_free;
 760         }
 761         if (sdcal_area->response.code != 0x0001) {
 762                 ret = -EIO;
 763                 CHSC_MSG(0, "sdcal: response code=%x\n",
 764                          sdcal_area->response.code);
 765                 goto out_free;
 766         }
 767         memcpy(&dcal->sdcal, &sdcal_area->response,
 768                sdcal_area->response.length);
 769         if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
 770                 ret = -EFAULT;
 771         else
 772                 ret = 0;
 773 out_free:
 774         kfree(dcal);
 775         free_page((unsigned long)sdcal_area);
 776         return ret;
 777 }
 778
 779 static long chsc_ioctl(struct file *filp, unsigned int cmd,
 780                        unsigned long arg)
 781 {
 782         void __user *argp;
 783
 784         CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
 785         if (is_compat_task())
 786                 argp = compat_ptr(arg);
 787         else
 788                 argp = (void __user *)arg;
 789         switch (cmd) {
 790         case CHSC_START:
 791                 return chsc_ioctl_start(argp);
 792         case CHSC_INFO_CHANNEL_PATH:
 793                 return chsc_ioctl_info_channel_path(argp);
 794         case CHSC_INFO_CU:
 795                 return chsc_ioctl_info_cu(argp);
 796         case CHSC_INFO_SCH_CU:
 797                 return chsc_ioctl_info_sch_cu(argp);
 798         case CHSC_INFO_CI:
 799                 return chsc_ioctl_conf_info(argp);
 800         case CHSC_INFO_CCL:
 801                 return chsc_ioctl_conf_comp_list(argp);
 802         case CHSC_INFO_CPD:
 803                 return chsc_ioctl_chpd(argp);
 804         case CHSC_INFO_DCAL:
 805                 return chsc_ioctl_dcal(argp);
 806         default: /* unknown ioctl number */
 807                 return -ENOIOCTLCMD;
 808         }
 809 }
 810
 811 static const struct file_operations chsc_fops = {
 812         .owner = THIS_MODULE,
 813         .open = nonseekable_open,
 814         .unlocked_ioctl = chsc_ioctl,
 815         .compat_ioctl = chsc_ioctl,
 816         .llseek = no_llseek,
 817 };
 818
 819 static struct miscdevice chsc_misc_device = {
 820         .minor = MISC_DYNAMIC_MINOR,
 821         .name = "chsc",
 822         .fops = &chsc_fops,
 823 };
 824
 825 static int __init chsc_misc_init(void)
 826 {
 827         return misc_register(&chsc_misc_device);
 828 }
 829
 830 static void chsc_misc_cleanup(void)
 831 {
 832         misc_deregister(&chsc_misc_device);
 833 }
 834
 835 static int __init chsc_sch_init(void)
 836 {
 837         int ret;
 838
 839         ret = chsc_init_dbfs();
 840         if (ret)
 841                 return ret;
 842         isc_register(CHSC_SCH_ISC);
 843         ret = chsc_init_sch_driver();
 844         if (ret)
 845                 goto out_dbf;
 846         ret = chsc_misc_init();
 847         if (ret)
 848                 goto out_driver;
 849         return ret;
 850 out_driver:
 851         chsc_cleanup_sch_driver();
 852 out_dbf:
 853         isc_unregister(CHSC_SCH_ISC);
 854         chsc_remove_dbfs();
 855         return ret;
 856 }
 857
 858 static void __exit chsc_sch_exit(void)
 859 {
 860         chsc_misc_cleanup();
 861         chsc_cleanup_sch_driver();
 862         isc_unregister(CHSC_SCH_ISC);
 863         chsc_remove_dbfs();
 864 }
 865
 866 module_init(chsc_sch_init);
 867 module_exit(chsc_sch_exit);