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