drivers/s390/cio/chsc_sch.c

   1 /*
   2  * Driver for s390 chsc subchannels
   3  *
   4  * Copyright IBM Corp. 2008
   5  * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
   6  *
   7  */
   8
   9 #include <linux/device.h>
  10 #include <linux/module.h>
  11 #include <linux/uaccess.h>
  12 #include <linux/miscdevice.h>
  13
  14 #include <asm/cio.h>
  15 #include <asm/chsc.h>
  16 #include <asm/isc.h>
  17
  18 #include "cio.h"
  19 #include "cio_debug.h"
  20 #include "css.h"
  21 #include "chsc_sch.h"
  22 #include "ioasm.h"
  23
  24 static debug_info_t *chsc_debug_msg_id;
  25 static debug_info_t *chsc_debug_log_id;
  26
  27 #define CHSC_MSG(imp, args...) do {                                     \
  28                 debug_sprintf_event(chsc_debug_msg_id, imp , ##args);   \
  29         } while (0)
  30
  31 #define CHSC_LOG(imp, txt) do {                                 \
  32                 debug_text_event(chsc_debug_log_id, imp , txt); \
  33         } while (0)
  34
  35 static void CHSC_LOG_HEX(int level, void *data, int length)
  36 {
  37         while (length > 0) {
  38                 debug_event(chsc_debug_log_id, level, data, length);
  39                 length -= chsc_debug_log_id->buf_size;
  40                 data += chsc_debug_log_id->buf_size;
  41         }
  42 }
  43
  44 MODULE_AUTHOR("IBM Corporation");
  45 MODULE_DESCRIPTION("driver for s390 chsc subchannels");
  46 MODULE_LICENSE("GPL");
  47
  48 static void chsc_subchannel_irq(struct subchannel *sch)
  49 {
  50         struct chsc_private *private = sch->private;
  51         struct chsc_request *request = private->request;
  52         struct irb *irb = (struct irb *)__LC_IRB;
  53
  54         CHSC_LOG(4, "irb");
  55         CHSC_LOG_HEX(4, irb, sizeof(*irb));
  56         /* Copy irb to provided request and set done. */
  57         if (!request) {
  58                 CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n",
  59                          sch->schid.ssid, sch->schid.sch_no);
  60                 return;
  61         }
  62         private->request = NULL;
  63         memcpy(&request->irb, irb, sizeof(*irb));
  64         stsch(sch->schid, &sch->schib);
  65         complete(&request->completion);
  66         put_device(&sch->dev);
  67 }
  68
  69 static int chsc_subchannel_probe(struct subchannel *sch)
  70 {
  71         struct chsc_private *private;
  72         int ret;
  73
  74         CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n",
  75                  sch->schid.ssid, sch->schid.sch_no);
  76         sch->isc = CHSC_SCH_ISC;
  77         private = kzalloc(sizeof(*private), GFP_KERNEL);
  78         if (!private)
  79                 return -ENOMEM;
  80         ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
  81         if (ret) {
  82                 CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
  83                          sch->schid.ssid, sch->schid.sch_no, ret);
  84                 kfree(private);
  85         } else {
  86                 sch->private = private;
  87                 if (sch->dev.uevent_suppress) {
  88                         sch->dev.uevent_suppress = 0;
  89                         kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
  90                 }
  91         }
  92         return ret;
  93 }
  94
  95 static int chsc_subchannel_remove(struct subchannel *sch)
  96 {
  97         struct chsc_private *private;
  98
  99         cio_disable_subchannel(sch);
 100         private = sch->private;
 101         sch->private = NULL;
 102         if (private->request) {
 103                 complete(&private->request->completion);
 104                 put_device(&sch->dev);
 105         }
 106         kfree(private);
 107         return 0;
 108 }
 109
 110 static void chsc_subchannel_shutdown(struct subchannel *sch)
 111 {
 112         cio_disable_subchannel(sch);
 113 }
 114
 115 static struct css_device_id chsc_subchannel_ids[] = {
 116         { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
 117         { /* end of list */ },
 118 };
 119 MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
 120
 121 static struct css_driver chsc_subchannel_driver = {
 122         .owner = THIS_MODULE,
 123         .subchannel_type = chsc_subchannel_ids,
 124         .irq = chsc_subchannel_irq,
 125         .probe = chsc_subchannel_probe,
 126         .remove = chsc_subchannel_remove,
 127         .shutdown = chsc_subchannel_shutdown,
 128         .name = "chsc_subchannel",
 129 };
 130
 131 static int __init chsc_init_dbfs(void)
 132 {
 133         chsc_debug_msg_id = debug_register("chsc_msg", 16, 1,
 134                                            16 * sizeof(long));
 135         if (!chsc_debug_msg_id)
 136                 goto out;
 137         debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
 138         debug_set_level(chsc_debug_msg_id, 2);
 139         chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
 140         if (!chsc_debug_log_id)
 141                 goto out;
 142         debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
 143         debug_set_level(chsc_debug_log_id, 2);
 144         return 0;
 145 out:
 146         if (chsc_debug_msg_id)
 147                 debug_unregister(chsc_debug_msg_id);
 148         return -ENOMEM;
 149 }
 150
 151 static void chsc_remove_dbfs(void)
 152 {
 153         debug_unregister(chsc_debug_log_id);
 154         debug_unregister(chsc_debug_msg_id);
 155 }
 156
 157 static int __init chsc_init_sch_driver(void)
 158 {
 159         return css_driver_register(&chsc_subchannel_driver);
 160 }
 161
 162 static void chsc_cleanup_sch_driver(void)
 163 {
 164         css_driver_unregister(&chsc_subchannel_driver);
 165 }
 166
 167 static DEFINE_SPINLOCK(chsc_lock);
 168
 169 static int chsc_subchannel_match_next_free(struct device *dev, void *data)
 170 {
 171         struct subchannel *sch = to_subchannel(dev);
 172
 173         return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
 174 }
 175
 176 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
 177 {
 178         struct device *dev;
 179
 180         dev = driver_find_device(&chsc_subchannel_driver.drv,
 181                                  sch ? &sch->dev : NULL, NULL,
 182                                  chsc_subchannel_match_next_free);
 183         return dev ? to_subchannel(dev) : NULL;
 184 }
 185
 186 /**
 187  * chsc_async() - try to start a chsc request asynchronously
 188  * @chsc_area: request to be started
 189  * @request: request structure to associate
 190  *
 191  * Tries to start a chsc request on one of the existing chsc subchannels.
 192  * Returns:
 193  *  %0 if the request was performed synchronously
 194  *  %-EINPROGRESS if the request was successfully started
 195  *  %-EBUSY if all chsc subchannels are busy
 196  *  %-ENODEV if no chsc subchannels are available
 197  * Context:
 198  *  interrupts disabled, chsc_lock held
 199  */
 200 static int chsc_async(struct chsc_async_area *chsc_area,
 201                       struct chsc_request *request)
 202 {
 203         int cc;
 204         struct chsc_private *private;
 205         struct subchannel *sch = NULL;
 206         int ret = -ENODEV;
 207         char dbf[10];
 208
 209         chsc_area->header.key = PAGE_DEFAULT_KEY;
 210         while ((sch = chsc_get_next_subchannel(sch))) {
 211                 spin_lock(sch->lock);
 212                 private = sch->private;
 213                 if (private->request) {
 214                         spin_unlock(sch->lock);
 215                         ret = -EBUSY;
 216                         continue;
 217                 }
 218                 chsc_area->header.sid = sch->schid;
 219                 CHSC_LOG(2, "schid");
 220                 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
 221                 cc = chsc(chsc_area);
 222                 sprintf(dbf, "cc:%d", cc);
 223                 CHSC_LOG(2, dbf);
 224                 switch (cc) {
 225                 case 0:
 226                         ret = 0;
 227                         break;
 228                 case 1:
 229                         sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
 230                         ret = -EINPROGRESS;
 231                         private->request = request;
 232                         break;
 233                 case 2:
 234                         ret = -EBUSY;
 235                         break;
 236                 default:
 237                         ret = -ENODEV;
 238                 }
 239                 spin_unlock(sch->lock);
 240                 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
 241                          sch->schid.ssid, sch->schid.sch_no, cc);
 242                 if (ret == -EINPROGRESS)
 243                         return -EINPROGRESS;
 244                 put_device(&sch->dev);
 245                 if (ret == 0)
 246                         return 0;
 247         }
 248         return ret;
 249 }
 250
 251 static void chsc_log_command(struct chsc_async_area *chsc_area)
 252 {
 253         char dbf[10];
 254
 255         sprintf(dbf, "CHSC:%x", chsc_area->header.code);
 256         CHSC_LOG(0, dbf);
 257         CHSC_LOG_HEX(0, chsc_area, 32);
 258 }
 259
 260 static int chsc_examine_irb(struct chsc_request *request)
 261 {
 262         int backed_up;
 263
 264         if (!scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND)
 265                 return -EIO;
 266         backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
 267         request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
 268         if (scsw_cstat(&request->irb.scsw) == 0)
 269                 return 0;
 270         if (!backed_up)
 271                 return 0;
 272         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
 273                 return -EIO;
 274         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
 275                 return -EPERM;
 276         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
 277                 return -EAGAIN;
 278         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
 279                 return -EAGAIN;
 280         return -EIO;
 281 }
 282
 283 static int chsc_ioctl_start(void __user *user_area)
 284 {
 285         struct chsc_request *request;
 286         struct chsc_async_area *chsc_area;
 287         int ret;
 288         char dbf[10];
 289
 290         if (!css_general_characteristics.dynio)
 291                 /* It makes no sense to try. */
 292                 return -EOPNOTSUPP;
 293         chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
 294         if (!chsc_area)
 295                 return -ENOMEM;
 296         request = kzalloc(sizeof(*request), GFP_KERNEL);
 297         if (!request) {
 298                 ret = -ENOMEM;
 299                 goto out_free;
 300         }
 301         init_completion(&request->completion);
 302         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 303                 ret = -EFAULT;
 304                 goto out_free;
 305         }
 306         chsc_log_command(chsc_area);
 307         spin_lock_irq(&chsc_lock);
 308         ret = chsc_async(chsc_area, request);
 309         spin_unlock_irq(&chsc_lock);
 310         if (ret == -EINPROGRESS) {
 311                 wait_for_completion(&request->completion);
 312                 ret = chsc_examine_irb(request);
 313         }
 314         /* copy area back to user */
 315         if (!ret)
 316                 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 317                         ret = -EFAULT;
 318 out_free:
 319         sprintf(dbf, "ret:%d", ret);
 320         CHSC_LOG(0, dbf);
 321         kfree(request);
 322         free_page((unsigned long)chsc_area);
 323         return ret;
 324 }
 325
 326 static int chsc_ioctl_info_channel_path(void __user *user_cd)
 327 {
 328         struct chsc_chp_cd *cd;
 329         int ret, ccode;
 330         struct {
 331                 struct chsc_header request;
 332                 u32 : 2;
 333                 u32 m : 1;
 334                 u32 : 1;
 335                 u32 fmt1 : 4;
 336                 u32 cssid : 8;
 337                 u32 : 8;
 338                 u32 first_chpid : 8;
 339                 u32 : 24;
 340                 u32 last_chpid : 8;
 341                 u32 : 32;
 342                 struct chsc_header response;
 343                 u8 data[PAGE_SIZE - 20];
 344         } __attribute__ ((packed)) *scpcd_area;
 345
 346         scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 347         if (!scpcd_area)
 348                 return -ENOMEM;
 349         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 350         if (!cd) {
 351                 ret = -ENOMEM;
 352                 goto out_free;
 353         }
 354         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 355                 ret = -EFAULT;
 356                 goto out_free;
 357         }
 358         scpcd_area->request.length = 0x0010;
 359         scpcd_area->request.code = 0x0028;
 360         scpcd_area->m = cd->m;
 361         scpcd_area->fmt1 = cd->fmt;
 362         scpcd_area->cssid = cd->chpid.cssid;
 363         scpcd_area->first_chpid = cd->chpid.id;
 364         scpcd_area->last_chpid = cd->chpid.id;
 365
 366         ccode = chsc(scpcd_area);
 367         if (ccode != 0) {
 368                 ret = -EIO;
 369                 goto out_free;
 370         }
 371         if (scpcd_area->response.code != 0x0001) {
 372                 ret = -EIO;
 373                 CHSC_MSG(0, "scpcd: response code=%x\n",
 374                          scpcd_area->response.code);
 375                 goto out_free;
 376         }
 377         memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
 378         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 379                 ret = -EFAULT;
 380         else
 381                 ret = 0;
 382 out_free:
 383         kfree(cd);
 384         free_page((unsigned long)scpcd_area);
 385         return ret;
 386 }
 387
 388 static int chsc_ioctl_info_cu(void __user *user_cd)
 389 {
 390         struct chsc_cu_cd *cd;
 391         int ret, ccode;
 392         struct {
 393                 struct chsc_header request;
 394                 u32 : 2;
 395                 u32 m : 1;
 396                 u32 : 1;
 397                 u32 fmt1 : 4;
 398                 u32 cssid : 8;
 399                 u32 : 8;
 400                 u32 first_cun : 8;
 401                 u32 : 24;
 402                 u32 last_cun : 8;
 403                 u32 : 32;
 404                 struct chsc_header response;
 405                 u8 data[PAGE_SIZE - 20];
 406         } __attribute__ ((packed)) *scucd_area;
 407
 408         scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 409         if (!scucd_area)
 410                 return -ENOMEM;
 411         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 412         if (!cd) {
 413                 ret = -ENOMEM;
 414                 goto out_free;
 415         }
 416         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 417                 ret = -EFAULT;
 418                 goto out_free;
 419         }
 420         scucd_area->request.length = 0x0010;
 421         scucd_area->request.code = 0x0028;
 422         scucd_area->m = cd->m;
 423         scucd_area->fmt1 = cd->fmt;
 424         scucd_area->cssid = cd->cssid;
 425         scucd_area->first_cun = cd->cun;
 426         scucd_area->last_cun = cd->cun;
 427
 428         ccode = chsc(scucd_area);
 429         if (ccode != 0) {
 430                 ret = -EIO;
 431                 goto out_free;
 432         }
 433         if (scucd_area->response.code != 0x0001) {
 434                 ret = -EIO;
 435                 CHSC_MSG(0, "scucd: response code=%x\n",
 436                          scucd_area->response.code);
 437                 goto out_free;
 438         }
 439         memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
 440         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 441                 ret = -EFAULT;
 442         else
 443                 ret = 0;
 444 out_free:
 445         kfree(cd);
 446         free_page((unsigned long)scucd_area);
 447         return ret;
 448 }
 449
 450 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
 451 {
 452         struct chsc_sch_cud *cud;
 453         int ret, ccode;
 454         struct {
 455                 struct chsc_header request;
 456                 u32 : 2;
 457                 u32 m : 1;
 458                 u32 : 5;
 459                 u32 fmt1 : 4;
 460                 u32 : 2;
 461                 u32 ssid : 2;
 462                 u32 first_sch : 16;
 463                 u32 : 8;
 464                 u32 cssid : 8;
 465                 u32 last_sch : 16;
 466                 u32 : 32;
 467                 struct chsc_header response;
 468                 u8 data[PAGE_SIZE - 20];
 469         } __attribute__ ((packed)) *sscud_area;
 470
 471         sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 472         if (!sscud_area)
 473                 return -ENOMEM;
 474         cud = kzalloc(sizeof(*cud), GFP_KERNEL);
 475         if (!cud) {
 476                 ret = -ENOMEM;
 477                 goto out_free;
 478         }
 479         if (copy_from_user(cud, user_cud, sizeof(*cud))) {
 480                 ret = -EFAULT;
 481                 goto out_free;
 482         }
 483         sscud_area->request.length = 0x0010;
 484         sscud_area->request.code = 0x0006;
 485         sscud_area->m = cud->schid.m;
 486         sscud_area->fmt1 = cud->fmt;
 487         sscud_area->ssid = cud->schid.ssid;
 488         sscud_area->first_sch = cud->schid.sch_no;
 489         sscud_area->cssid = cud->schid.cssid;
 490         sscud_area->last_sch = cud->schid.sch_no;
 491
 492         ccode = chsc(sscud_area);
 493         if (ccode != 0) {
 494                 ret = -EIO;
 495                 goto out_free;
 496         }
 497         if (sscud_area->response.code != 0x0001) {
 498                 ret = -EIO;
 499                 CHSC_MSG(0, "sscud: response code=%x\n",
 500                          sscud_area->response.code);
 501                 goto out_free;
 502         }
 503         memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
 504         if (copy_to_user(user_cud, cud, sizeof(*cud)))
 505                 ret = -EFAULT;
 506         else
 507                 ret = 0;
 508 out_free:
 509         kfree(cud);
 510         free_page((unsigned long)sscud_area);
 511         return ret;
 512 }
 513
 514 static int chsc_ioctl_conf_info(void __user *user_ci)
 515 {
 516         struct chsc_conf_info *ci;
 517         int ret, ccode;
 518         struct {
 519                 struct chsc_header request;
 520                 u32 : 2;
 521                 u32 m : 1;
 522                 u32 : 1;
 523                 u32 fmt1 : 4;
 524                 u32 cssid : 8;
 525                 u32 : 6;
 526                 u32 ssid : 2;
 527                 u32 : 8;
 528                 u64 : 64;
 529                 struct chsc_header response;
 530                 u8 data[PAGE_SIZE - 20];
 531         } __attribute__ ((packed)) *sci_area;
 532
 533         sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 534         if (!sci_area)
 535                 return -ENOMEM;
 536         ci = kzalloc(sizeof(*ci), GFP_KERNEL);
 537         if (!ci) {
 538                 ret = -ENOMEM;
 539                 goto out_free;
 540         }
 541         if (copy_from_user(ci, user_ci, sizeof(*ci))) {
 542                 ret = -EFAULT;
 543                 goto out_free;
 544         }
 545         sci_area->request.length = 0x0010;
 546         sci_area->request.code = 0x0012;
 547         sci_area->m = ci->id.m;
 548         sci_area->fmt1 = ci->fmt;
 549         sci_area->cssid = ci->id.cssid;
 550         sci_area->ssid = ci->id.ssid;
 551
 552         ccode = chsc(sci_area);
 553         if (ccode != 0) {
 554                 ret = -EIO;
 555                 goto out_free;
 556         }
 557         if (sci_area->response.code != 0x0001) {
 558                 ret = -EIO;
 559                 CHSC_MSG(0, "sci: response code=%x\n",
 560                          sci_area->response.code);
 561                 goto out_free;
 562         }
 563         memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
 564         if (copy_to_user(user_ci, ci, sizeof(*ci)))
 565                 ret = -EFAULT;
 566         else
 567                 ret = 0;
 568 out_free:
 569         kfree(ci);
 570         free_page((unsigned long)sci_area);
 571         return ret;
 572 }
 573
 574 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
 575 {
 576         struct chsc_comp_list *ccl;
 577         int ret, ccode;
 578         struct {
 579                 struct chsc_header request;
 580                 u32 ctype : 8;
 581                 u32 : 4;
 582                 u32 fmt : 4;
 583                 u32 : 16;
 584                 u64 : 64;
 585                 u32 list_parm[2];
 586                 u64 : 64;
 587                 struct chsc_header response;
 588                 u8 data[PAGE_SIZE - 36];
 589         } __attribute__ ((packed)) *sccl_area;
 590         struct {
 591                 u32 m : 1;
 592                 u32 : 31;
 593                 u32 cssid : 8;
 594                 u32 : 16;
 595                 u32 chpid : 8;
 596         } __attribute__ ((packed)) *chpid_parm;
 597         struct {
 598                 u32 f_cssid : 8;
 599                 u32 l_cssid : 8;
 600                 u32 : 16;
 601                 u32 res;
 602         } __attribute__ ((packed)) *cssids_parm;
 603
 604         sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 605         if (!sccl_area)
 606                 return -ENOMEM;
 607         ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
 608         if (!ccl) {
 609                 ret = -ENOMEM;
 610                 goto out_free;
 611         }
 612         if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
 613                 ret = -EFAULT;
 614                 goto out_free;
 615         }
 616         sccl_area->request.length = 0x0020;
 617         sccl_area->request.code = 0x0030;
 618         sccl_area->fmt = ccl->req.fmt;
 619         sccl_area->ctype = ccl->req.ctype;
 620         switch (sccl_area->ctype) {
 621         case CCL_CU_ON_CHP:
 622         case CCL_IOP_CHP:
 623                 chpid_parm = (void *)&sccl_area->list_parm;
 624                 chpid_parm->m = ccl->req.chpid.m;
 625                 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
 626                 chpid_parm->chpid = ccl->req.chpid.chp.id;
 627                 break;
 628         case CCL_CSS_IMG:
 629         case CCL_CSS_IMG_CONF_CHAR:
 630                 cssids_parm = (void *)&sccl_area->list_parm;
 631                 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
 632                 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
 633                 break;
 634         }
 635         ccode = chsc(sccl_area);
 636         if (ccode != 0) {
 637                 ret = -EIO;
 638                 goto out_free;
 639         }
 640         if (sccl_area->response.code != 0x0001) {
 641                 ret = -EIO;
 642                 CHSC_MSG(0, "sccl: response code=%x\n",
 643                          sccl_area->response.code);
 644                 goto out_free;
 645         }
 646         memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
 647         if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
 648                 ret = -EFAULT;
 649         else
 650                 ret = 0;
 651 out_free:
 652         kfree(ccl);
 653         free_page((unsigned long)sccl_area);
 654         return ret;
 655 }
 656
 657 static int chsc_ioctl_chpd(void __user *user_chpd)
 658 {
 659         struct chsc_cpd_info *chpd;
 660         int ret;
 661
 662         chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
 663         if (!chpd)
 664                 return -ENOMEM;
 665         if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
 666                 ret = -EFAULT;
 667                 goto out_free;
 668         }
 669         ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
 670                                                chpd->rfmt, chpd->c, chpd->m,
 671                                                &chpd->chpdb);
 672         if (ret)
 673                 goto out_free;
 674         if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
 675                 ret = -EFAULT;
 676 out_free:
 677         kfree(chpd);
 678         return ret;
 679 }
 680
 681 static int chsc_ioctl_dcal(void __user *user_dcal)
 682 {
 683         struct chsc_dcal *dcal;
 684         int ret, ccode;
 685         struct {
 686                 struct chsc_header request;
 687                 u32 atype : 8;
 688                 u32 : 4;
 689                 u32 fmt : 4;
 690                 u32 : 16;
 691                 u32 res0[2];
 692                 u32 list_parm[2];
 693                 u32 res1[2];
 694                 struct chsc_header response;
 695                 u8 data[PAGE_SIZE - 36];
 696         } __attribute__ ((packed)) *sdcal_area;
 697
 698         sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 699         if (!sdcal_area)
 700                 return -ENOMEM;
 701         dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
 702         if (!dcal) {
 703                 ret = -ENOMEM;
 704                 goto out_free;
 705         }
 706         if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
 707                 ret = -EFAULT;
 708                 goto out_free;
 709         }
 710         sdcal_area->request.length = 0x0020;
 711         sdcal_area->request.code = 0x0034;
 712         sdcal_area->atype = dcal->req.atype;
 713         sdcal_area->fmt = dcal->req.fmt;
 714         memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
 715                sizeof(sdcal_area->list_parm));
 716
 717         ccode = chsc(sdcal_area);
 718         if (ccode != 0) {
 719                 ret = -EIO;
 720                 goto out_free;
 721         }
 722         if (sdcal_area->response.code != 0x0001) {
 723                 ret = -EIO;
 724                 CHSC_MSG(0, "sdcal: response code=%x\n",
 725                          sdcal_area->response.code);
 726                 goto out_free;
 727         }
 728         memcpy(&dcal->sdcal, &sdcal_area->response,
 729                sdcal_area->response.length);
 730         if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
 731                 ret = -EFAULT;
 732         else
 733                 ret = 0;
 734 out_free:
 735         kfree(dcal);
 736         free_page((unsigned long)sdcal_area);
 737         return ret;
 738 }
 739
 740 static long chsc_ioctl(struct file *filp, unsigned int cmd,
 741                        unsigned long arg)
 742 {
 743         CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
 744         switch (cmd) {
 745         case CHSC_START:
 746                 return chsc_ioctl_start((void __user *)arg);
 747         case CHSC_INFO_CHANNEL_PATH:
 748                 return chsc_ioctl_info_channel_path((void __user *)arg);
 749         case CHSC_INFO_CU:
 750                 return chsc_ioctl_info_cu((void __user *)arg);
 751         case CHSC_INFO_SCH_CU:
 752                 return chsc_ioctl_info_sch_cu((void __user *)arg);
 753         case CHSC_INFO_CI:
 754                 return chsc_ioctl_conf_info((void __user *)arg);
 755         case CHSC_INFO_CCL:
 756                 return chsc_ioctl_conf_comp_list((void __user *)arg);
 757         case CHSC_INFO_CPD:
 758                 return chsc_ioctl_chpd((void __user *)arg);
 759         case CHSC_INFO_DCAL:
 760                 return chsc_ioctl_dcal((void __user *)arg);
 761         default: /* unknown ioctl number */
 762                 return -ENOIOCTLCMD;
 763         }
 764 }
 765
 766 static const struct file_operations chsc_fops = {
 767         .owner = THIS_MODULE,
 768         .unlocked_ioctl = chsc_ioctl,
 769         .compat_ioctl = chsc_ioctl,
 770 };
 771
 772 static struct miscdevice chsc_misc_device = {
 773         .minor = MISC_DYNAMIC_MINOR,
 774         .name = "chsc",
 775         .fops = &chsc_fops,
 776 };
 777
 778 static int __init chsc_misc_init(void)
 779 {
 780         return misc_register(&chsc_misc_device);
 781 }
 782
 783 static void chsc_misc_cleanup(void)
 784 {
 785         misc_deregister(&chsc_misc_device);
 786 }
 787
 788 static int __init chsc_sch_init(void)
 789 {
 790         int ret;
 791
 792         ret = chsc_init_dbfs();
 793         if (ret)
 794                 return ret;
 795         isc_register(CHSC_SCH_ISC);
 796         ret = chsc_init_sch_driver();
 797         if (ret)
 798                 goto out_dbf;
 799         ret = chsc_misc_init();
 800         if (ret)
 801                 goto out_driver;
 802         return ret;
 803 out_driver:
 804         chsc_cleanup_sch_driver();
 805 out_dbf:
 806         isc_unregister(CHSC_SCH_ISC);
 807         chsc_remove_dbfs();
 808         return ret;
 809 }
 810
 811 static void __exit chsc_sch_exit(void)
 812 {
 813         chsc_misc_cleanup();
 814         chsc_cleanup_sch_driver();
 815         isc_unregister(CHSC_SCH_ISC);
 816         chsc_remove_dbfs();
 817 }
 818
 819 module_init(chsc_sch_init);
 820 module_exit(chsc_sch_exit);