drivers/s390/cio/chsc_sch.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Driver for s390 chsc subchannels
   4  *
   5  * Copyright IBM Corp. 2008, 2011
   6  *
   7  * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
   8  *
   9  */
  10
  11 #include <linux/slab.h>
  12 #include <linux/compat.h>
  13 #include <linux/device.h>
  14 #include <linux/io.h>
  15 #include <linux/module.h>
  16 #include <linux/uaccess.h>
  17 #include <linux/miscdevice.h>
  18 #include <linux/kernel_stat.h>
  19
  20 #include <asm/cio.h>
  21 #include <asm/chsc.h>
  22 #include <asm/isc.h>
  23
  24 #include "cio.h"
  25 #include "cio_debug.h"
  26 #include "css.h"
  27 #include "chsc_sch.h"
  28 #include "ioasm.h"
  29
  30 static debug_info_t *chsc_debug_msg_id;
  31 static debug_info_t *chsc_debug_log_id;
  32
  33 static struct chsc_request *on_close_request;
  34 static struct chsc_async_area *on_close_chsc_area;
  35 static DEFINE_MUTEX(on_close_mutex);
  36
  37 #define CHSC_MSG(imp, args...) do {                                     \
  38                 debug_sprintf_event(chsc_debug_msg_id, imp , ##args);   \
  39         } while (0)
  40
  41 #define CHSC_LOG(imp, txt) do {                                 \
  42                 debug_text_event(chsc_debug_log_id, imp , txt); \
  43         } while (0)
  44
  45 static void CHSC_LOG_HEX(int level, void *data, int length)
  46 {
  47         debug_event(chsc_debug_log_id, level, data, length);
  48 }
  49
  50 MODULE_AUTHOR("IBM Corporation");
  51 MODULE_DESCRIPTION("driver for s390 chsc subchannels");
  52 MODULE_LICENSE("GPL");
  53
  54 static void chsc_subchannel_irq(struct subchannel *sch)
  55 {
  56         struct chsc_private *private = dev_get_drvdata(&sch->dev);
  57         struct chsc_request *request = private->request;
  58         struct irb *irb = this_cpu_ptr(&cio_irb);
  59
  60         CHSC_LOG(4, "irb");
  61         CHSC_LOG_HEX(4, irb, sizeof(*irb));
  62         inc_irq_stat(IRQIO_CSC);
  63
  64         /* Copy irb to provided request and set done. */
  65         if (!request) {
  66                 CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n",
  67                          sch->schid.ssid, sch->schid.sch_no);
  68                 return;
  69         }
  70         private->request = NULL;
  71         memcpy(&request->irb, irb, sizeof(*irb));
  72         cio_update_schib(sch);
  73         complete(&request->completion);
  74         put_device(&sch->dev);
  75 }
  76
  77 static int chsc_subchannel_probe(struct subchannel *sch)
  78 {
  79         struct chsc_private *private;
  80         int ret;
  81
  82         CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n",
  83                  sch->schid.ssid, sch->schid.sch_no);
  84         sch->isc = CHSC_SCH_ISC;
  85         private = kzalloc(sizeof(*private), GFP_KERNEL);
  86         if (!private)
  87                 return -ENOMEM;
  88         dev_set_drvdata(&sch->dev, private);
  89         ret = cio_enable_subchannel(sch, (u32)virt_to_phys(sch));
  90         if (ret) {
  91                 CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
  92                          sch->schid.ssid, sch->schid.sch_no, ret);
  93                 dev_set_drvdata(&sch->dev, NULL);
  94                 kfree(private);
  95         }
  96         return ret;
  97 }
  98
  99 static void 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 }
 112
 113 static void chsc_subchannel_shutdown(struct subchannel *sch)
 114 {
 115         cio_disable_subchannel(sch);
 116 }
 117
 118 static struct css_device_id chsc_subchannel_ids[] = {
 119         { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
 120         { /* end of list */ },
 121 };
 122 MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
 123
 124 static struct css_driver chsc_subchannel_driver = {
 125         .drv = {
 126                 .owner = THIS_MODULE,
 127                 .name = "chsc_subchannel",
 128         },
 129         .subchannel_type = chsc_subchannel_ids,
 130         .irq = chsc_subchannel_irq,
 131         .probe = chsc_subchannel_probe,
 132         .remove = chsc_subchannel_remove,
 133         .shutdown = chsc_subchannel_shutdown,
 134 };
 135
 136 static int __init chsc_init_dbfs(void)
 137 {
 138         chsc_debug_msg_id = debug_register("chsc_msg", 8, 1, 4 * sizeof(long));
 139         if (!chsc_debug_msg_id)
 140                 goto out;
 141         debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
 142         debug_set_level(chsc_debug_msg_id, 2);
 143         chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
 144         if (!chsc_debug_log_id)
 145                 goto out;
 146         debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
 147         debug_set_level(chsc_debug_log_id, 2);
 148         return 0;
 149 out:
 150         debug_unregister(chsc_debug_msg_id);
 151         return -ENOMEM;
 152 }
 153
 154 static void chsc_remove_dbfs(void)
 155 {
 156         debug_unregister(chsc_debug_log_id);
 157         debug_unregister(chsc_debug_msg_id);
 158 }
 159
 160 static int __init chsc_init_sch_driver(void)
 161 {
 162         return css_driver_register(&chsc_subchannel_driver);
 163 }
 164
 165 static void chsc_cleanup_sch_driver(void)
 166 {
 167         css_driver_unregister(&chsc_subchannel_driver);
 168 }
 169
 170 static DEFINE_SPINLOCK(chsc_lock);
 171
 172 static int chsc_subchannel_match_next_free(struct device *dev, const void *data)
 173 {
 174         struct subchannel *sch = to_subchannel(dev);
 175
 176         return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
 177 }
 178
 179 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
 180 {
 181         struct device *dev;
 182
 183         dev = driver_find_device(&chsc_subchannel_driver.drv,
 184                                  sch ? &sch->dev : NULL, NULL,
 185                                  chsc_subchannel_match_next_free);
 186         return dev ? to_subchannel(dev) : NULL;
 187 }
 188
 189 /**
 190  * chsc_async() - try to start a chsc request asynchronously
 191  * @chsc_area: request to be started
 192  * @request: request structure to associate
 193  *
 194  * Tries to start a chsc request on one of the existing chsc subchannels.
 195  * Returns:
 196  *  %0 if the request was performed synchronously
 197  *  %-EINPROGRESS if the request was successfully started
 198  *  %-EBUSY if all chsc subchannels are busy
 199  *  %-ENODEV if no chsc subchannels are available
 200  * Context:
 201  *  interrupts disabled, chsc_lock held
 202  */
 203 static int chsc_async(struct chsc_async_area *chsc_area,
 204                       struct chsc_request *request)
 205 {
 206         int cc;
 207         struct chsc_private *private;
 208         struct subchannel *sch = NULL;
 209         int ret = -ENODEV;
 210         char dbf[10];
 211
 212         chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
 213         while ((sch = chsc_get_next_subchannel(sch))) {
 214                 spin_lock(&sch->lock);
 215                 private = dev_get_drvdata(&sch->dev);
 216                 if (private->request) {
 217                         spin_unlock(&sch->lock);
 218                         ret = -EBUSY;
 219                         continue;
 220                 }
 221                 chsc_area->header.sid = sch->schid;
 222                 CHSC_LOG(2, "schid");
 223                 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
 224                 cc = chsc(chsc_area);
 225                 snprintf(dbf, sizeof(dbf), "cc:%d", cc);
 226                 CHSC_LOG(2, dbf);
 227                 switch (cc) {
 228                 case 0:
 229                         ret = 0;
 230                         break;
 231                 case 1:
 232                         sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
 233                         ret = -EINPROGRESS;
 234                         private->request = request;
 235                         break;
 236                 case 2:
 237                         ret = -EBUSY;
 238                         break;
 239                 default:
 240                         ret = -ENODEV;
 241                 }
 242                 spin_unlock(&sch->lock);
 243                 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
 244                          sch->schid.ssid, sch->schid.sch_no, cc);
 245                 if (ret == -EINPROGRESS)
 246                         return -EINPROGRESS;
 247                 put_device(&sch->dev);
 248                 if (ret == 0)
 249                         return 0;
 250         }
 251         return ret;
 252 }
 253
 254 static void chsc_log_command(void *chsc_area)
 255 {
 256         char dbf[10];
 257
 258         snprintf(dbf, sizeof(dbf), "CHSC:%x", ((uint16_t *)chsc_area)[1]);
 259         CHSC_LOG(0, dbf);
 260         CHSC_LOG_HEX(0, chsc_area, 32);
 261 }
 262
 263 static int chsc_examine_irb(struct chsc_request *request)
 264 {
 265         int backed_up;
 266
 267         if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
 268                 return -EIO;
 269         backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
 270         request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
 271         if (scsw_cstat(&request->irb.scsw) == 0)
 272                 return 0;
 273         if (!backed_up)
 274                 return 0;
 275         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
 276                 return -EIO;
 277         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
 278                 return -EPERM;
 279         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
 280                 return -EAGAIN;
 281         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
 282                 return -EAGAIN;
 283         return -EIO;
 284 }
 285
 286 static int chsc_ioctl_start(void __user *user_area)
 287 {
 288         struct chsc_request *request;
 289         struct chsc_async_area *chsc_area;
 290         int ret;
 291         char dbf[10];
 292
 293         if (!css_general_characteristics.dynio)
 294                 /* It makes no sense to try. */
 295                 return -EOPNOTSUPP;
 296         chsc_area = (void *)get_zeroed_page(GFP_KERNEL);
 297         if (!chsc_area)
 298                 return -ENOMEM;
 299         request = kzalloc(sizeof(*request), GFP_KERNEL);
 300         if (!request) {
 301                 ret = -ENOMEM;
 302                 goto out_free;
 303         }
 304         init_completion(&request->completion);
 305         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 306                 ret = -EFAULT;
 307                 goto out_free;
 308         }
 309         chsc_log_command(chsc_area);
 310         spin_lock_irq(&chsc_lock);
 311         ret = chsc_async(chsc_area, request);
 312         spin_unlock_irq(&chsc_lock);
 313         if (ret == -EINPROGRESS) {
 314                 wait_for_completion(&request->completion);
 315                 ret = chsc_examine_irb(request);
 316         }
 317         /* copy area back to user */
 318         if (!ret)
 319                 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 320                         ret = -EFAULT;
 321 out_free:
 322         snprintf(dbf, sizeof(dbf), "ret:%d", ret);
 323         CHSC_LOG(0, dbf);
 324         kfree(request);
 325         free_page((unsigned long)chsc_area);
 326         return ret;
 327 }
 328
 329 static int chsc_ioctl_on_close_set(void __user *user_area)
 330 {
 331         char dbf[13];
 332         int ret;
 333
 334         mutex_lock(&on_close_mutex);
 335         if (on_close_chsc_area) {
 336                 ret = -EBUSY;
 337                 goto out_unlock;
 338         }
 339         on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL);
 340         if (!on_close_request) {
 341                 ret = -ENOMEM;
 342                 goto out_unlock;
 343         }
 344         on_close_chsc_area = (void *)get_zeroed_page(GFP_KERNEL);
 345         if (!on_close_chsc_area) {
 346                 ret = -ENOMEM;
 347                 goto out_free_request;
 348         }
 349         if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) {
 350                 ret = -EFAULT;
 351                 goto out_free_chsc;
 352         }
 353         ret = 0;
 354         goto out_unlock;
 355
 356 out_free_chsc:
 357         free_page((unsigned long)on_close_chsc_area);
 358         on_close_chsc_area = NULL;
 359 out_free_request:
 360         kfree(on_close_request);
 361         on_close_request = NULL;
 362 out_unlock:
 363         mutex_unlock(&on_close_mutex);
 364         snprintf(dbf, sizeof(dbf), "ocsret:%d", ret);
 365         CHSC_LOG(0, dbf);
 366         return ret;
 367 }
 368
 369 static int chsc_ioctl_on_close_remove(void)
 370 {
 371         char dbf[13];
 372         int ret;
 373
 374         mutex_lock(&on_close_mutex);
 375         if (!on_close_chsc_area) {
 376                 ret = -ENOENT;
 377                 goto out_unlock;
 378         }
 379         free_page((unsigned long)on_close_chsc_area);
 380         on_close_chsc_area = NULL;
 381         kfree(on_close_request);
 382         on_close_request = NULL;
 383         ret = 0;
 384 out_unlock:
 385         mutex_unlock(&on_close_mutex);
 386         snprintf(dbf, sizeof(dbf), "ocrret:%d", ret);
 387         CHSC_LOG(0, dbf);
 388         return ret;
 389 }
 390
 391 static int chsc_ioctl_start_sync(void __user *user_area)
 392 {
 393         struct chsc_sync_area *chsc_area;
 394         int ret, ccode;
 395
 396         chsc_area = (void *)get_zeroed_page(GFP_KERNEL);
 397         if (!chsc_area)
 398                 return -ENOMEM;
 399         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 400                 ret = -EFAULT;
 401                 goto out_free;
 402         }
 403         if (chsc_area->header.code & 0x4000) {
 404                 ret = -EINVAL;
 405                 goto out_free;
 406         }
 407         chsc_log_command(chsc_area);
 408         ccode = chsc(chsc_area);
 409         if (ccode != 0) {
 410                 ret = -EIO;
 411                 goto out_free;
 412         }
 413         if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 414                 ret = -EFAULT;
 415         else
 416                 ret = 0;
 417 out_free:
 418         free_page((unsigned long)chsc_area);
 419         return ret;
 420 }
 421
 422 static int chsc_ioctl_info_channel_path(void __user *user_cd)
 423 {
 424         struct chsc_chp_cd *cd;
 425         int ret, ccode;
 426         struct {
 427                 struct chsc_header request;
 428                 u32 : 2;
 429                 u32 m : 1;
 430                 u32 : 1;
 431                 u32 fmt1 : 4;
 432                 u32 cssid : 8;
 433                 u32 : 8;
 434                 u32 first_chpid : 8;
 435                 u32 : 24;
 436                 u32 last_chpid : 8;
 437                 u32 : 32;
 438                 struct chsc_header response;
 439                 u8 data[PAGE_SIZE - 20];
 440         } __attribute__ ((packed)) *scpcd_area;
 441
 442         scpcd_area = (void *)get_zeroed_page(GFP_KERNEL);
 443         if (!scpcd_area)
 444                 return -ENOMEM;
 445         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 446         if (!cd) {
 447                 ret = -ENOMEM;
 448                 goto out_free;
 449         }
 450         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 451                 ret = -EFAULT;
 452                 goto out_free;
 453         }
 454         scpcd_area->request.length = 0x0010;
 455         scpcd_area->request.code = 0x0028;
 456         scpcd_area->m = cd->m;
 457         scpcd_area->fmt1 = cd->fmt;
 458         scpcd_area->cssid = cd->chpid.cssid;
 459         scpcd_area->first_chpid = cd->chpid.id;
 460         scpcd_area->last_chpid = cd->chpid.id;
 461
 462         ccode = chsc(scpcd_area);
 463         if (ccode != 0) {
 464                 ret = -EIO;
 465                 goto out_free;
 466         }
 467         if (scpcd_area->response.code != 0x0001) {
 468                 ret = -EIO;
 469                 CHSC_MSG(0, "scpcd: response code=%x\n",
 470                          scpcd_area->response.code);
 471                 goto out_free;
 472         }
 473         memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
 474         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 475                 ret = -EFAULT;
 476         else
 477                 ret = 0;
 478 out_free:
 479         kfree(cd);
 480         free_page((unsigned long)scpcd_area);
 481         return ret;
 482 }
 483
 484 static int chsc_ioctl_info_cu(void __user *user_cd)
 485 {
 486         struct chsc_cu_cd *cd;
 487         int ret, ccode;
 488         struct {
 489                 struct chsc_header request;
 490                 u32 : 2;
 491                 u32 m : 1;
 492                 u32 : 1;
 493                 u32 fmt1 : 4;
 494                 u32 cssid : 8;
 495                 u32 : 8;
 496                 u32 first_cun : 8;
 497                 u32 : 24;
 498                 u32 last_cun : 8;
 499                 u32 : 32;
 500                 struct chsc_header response;
 501                 u8 data[PAGE_SIZE - 20];
 502         } __attribute__ ((packed)) *scucd_area;
 503
 504         scucd_area = (void *)get_zeroed_page(GFP_KERNEL);
 505         if (!scucd_area)
 506                 return -ENOMEM;
 507         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 508         if (!cd) {
 509                 ret = -ENOMEM;
 510                 goto out_free;
 511         }
 512         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 513                 ret = -EFAULT;
 514                 goto out_free;
 515         }
 516         scucd_area->request.length = 0x0010;
 517         scucd_area->request.code = 0x0026;
 518         scucd_area->m = cd->m;
 519         scucd_area->fmt1 = cd->fmt;
 520         scucd_area->cssid = cd->cssid;
 521         scucd_area->first_cun = cd->cun;
 522         scucd_area->last_cun = cd->cun;
 523
 524         ccode = chsc(scucd_area);
 525         if (ccode != 0) {
 526                 ret = -EIO;
 527                 goto out_free;
 528         }
 529         if (scucd_area->response.code != 0x0001) {
 530                 ret = -EIO;
 531                 CHSC_MSG(0, "scucd: response code=%x\n",
 532                          scucd_area->response.code);
 533                 goto out_free;
 534         }
 535         memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
 536         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 537                 ret = -EFAULT;
 538         else
 539                 ret = 0;
 540 out_free:
 541         kfree(cd);
 542         free_page((unsigned long)scucd_area);
 543         return ret;
 544 }
 545
 546 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
 547 {
 548         struct chsc_sch_cud *cud;
 549         int ret, ccode;
 550         struct {
 551                 struct chsc_header request;
 552                 u32 : 2;
 553                 u32 m : 1;
 554                 u32 : 5;
 555                 u32 fmt1 : 4;
 556                 u32 : 2;
 557                 u32 ssid : 2;
 558                 u32 first_sch : 16;
 559                 u32 : 8;
 560                 u32 cssid : 8;
 561                 u32 last_sch : 16;
 562                 u32 : 32;
 563                 struct chsc_header response;
 564                 u8 data[PAGE_SIZE - 20];
 565         } __attribute__ ((packed)) *sscud_area;
 566
 567         sscud_area = (void *)get_zeroed_page(GFP_KERNEL);
 568         if (!sscud_area)
 569                 return -ENOMEM;
 570         cud = kzalloc(sizeof(*cud), GFP_KERNEL);
 571         if (!cud) {
 572                 ret = -ENOMEM;
 573                 goto out_free;
 574         }
 575         if (copy_from_user(cud, user_cud, sizeof(*cud))) {
 576                 ret = -EFAULT;
 577                 goto out_free;
 578         }
 579         sscud_area->request.length = 0x0010;
 580         sscud_area->request.code = 0x0006;
 581         sscud_area->m = cud->schid.m;
 582         sscud_area->fmt1 = cud->fmt;
 583         sscud_area->ssid = cud->schid.ssid;
 584         sscud_area->first_sch = cud->schid.sch_no;
 585         sscud_area->cssid = cud->schid.cssid;
 586         sscud_area->last_sch = cud->schid.sch_no;
 587
 588         ccode = chsc(sscud_area);
 589         if (ccode != 0) {
 590                 ret = -EIO;
 591                 goto out_free;
 592         }
 593         if (sscud_area->response.code != 0x0001) {
 594                 ret = -EIO;
 595                 CHSC_MSG(0, "sscud: response code=%x\n",
 596                          sscud_area->response.code);
 597                 goto out_free;
 598         }
 599         memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
 600         if (copy_to_user(user_cud, cud, sizeof(*cud)))
 601                 ret = -EFAULT;
 602         else
 603                 ret = 0;
 604 out_free:
 605         kfree(cud);
 606         free_page((unsigned long)sscud_area);
 607         return ret;
 608 }
 609
 610 static int chsc_ioctl_conf_info(void __user *user_ci)
 611 {
 612         struct chsc_conf_info *ci;
 613         int ret, ccode;
 614         struct {
 615                 struct chsc_header request;
 616                 u32 : 2;
 617                 u32 m : 1;
 618                 u32 : 1;
 619                 u32 fmt1 : 4;
 620                 u32 cssid : 8;
 621                 u32 : 6;
 622                 u32 ssid : 2;
 623                 u32 : 8;
 624                 u64 : 64;
 625                 struct chsc_header response;
 626                 u8 data[PAGE_SIZE - 20];
 627         } __attribute__ ((packed)) *sci_area;
 628
 629         sci_area = (void *)get_zeroed_page(GFP_KERNEL);
 630         if (!sci_area)
 631                 return -ENOMEM;
 632         ci = kzalloc(sizeof(*ci), GFP_KERNEL);
 633         if (!ci) {
 634                 ret = -ENOMEM;
 635                 goto out_free;
 636         }
 637         if (copy_from_user(ci, user_ci, sizeof(*ci))) {
 638                 ret = -EFAULT;
 639                 goto out_free;
 640         }
 641         sci_area->request.length = 0x0010;
 642         sci_area->request.code = 0x0012;
 643         sci_area->m = ci->id.m;
 644         sci_area->fmt1 = ci->fmt;
 645         sci_area->cssid = ci->id.cssid;
 646         sci_area->ssid = ci->id.ssid;
 647
 648         ccode = chsc(sci_area);
 649         if (ccode != 0) {
 650                 ret = -EIO;
 651                 goto out_free;
 652         }
 653         if (sci_area->response.code != 0x0001) {
 654                 ret = -EIO;
 655                 CHSC_MSG(0, "sci: response code=%x\n",
 656                          sci_area->response.code);
 657                 goto out_free;
 658         }
 659         memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
 660         if (copy_to_user(user_ci, ci, sizeof(*ci)))
 661                 ret = -EFAULT;
 662         else
 663                 ret = 0;
 664 out_free:
 665         kfree(ci);
 666         free_page((unsigned long)sci_area);
 667         return ret;
 668 }
 669
 670 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
 671 {
 672         struct chsc_comp_list *ccl;
 673         int ret, ccode;
 674         struct {
 675                 struct chsc_header request;
 676                 u32 ctype : 8;
 677                 u32 : 4;
 678                 u32 fmt : 4;
 679                 u32 : 16;
 680                 u64 : 64;
 681                 u32 list_parm[2];
 682                 u64 : 64;
 683                 struct chsc_header response;
 684                 u8 data[PAGE_SIZE - 36];
 685         } __attribute__ ((packed)) *sccl_area;
 686         struct {
 687                 u32 m : 1;
 688                 u32 : 31;
 689                 u32 cssid : 8;
 690                 u32 : 16;
 691                 u32 chpid : 8;
 692         } __attribute__ ((packed)) *chpid_parm;
 693         struct {
 694                 u32 f_cssid : 8;
 695                 u32 l_cssid : 8;
 696                 u32 : 16;
 697                 u32 res;
 698         } __attribute__ ((packed)) *cssids_parm;
 699
 700         sccl_area = (void *)get_zeroed_page(GFP_KERNEL);
 701         if (!sccl_area)
 702                 return -ENOMEM;
 703         ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
 704         if (!ccl) {
 705                 ret = -ENOMEM;
 706                 goto out_free;
 707         }
 708         if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
 709                 ret = -EFAULT;
 710                 goto out_free;
 711         }
 712         sccl_area->request.length = 0x0020;
 713         sccl_area->request.code = 0x0030;
 714         sccl_area->fmt = ccl->req.fmt;
 715         sccl_area->ctype = ccl->req.ctype;
 716         switch (sccl_area->ctype) {
 717         case CCL_CU_ON_CHP:
 718         case CCL_IOP_CHP:
 719                 chpid_parm = (void *)&sccl_area->list_parm;
 720                 chpid_parm->m = ccl->req.chpid.m;
 721                 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
 722                 chpid_parm->chpid = ccl->req.chpid.chp.id;
 723                 break;
 724         case CCL_CSS_IMG:
 725         case CCL_CSS_IMG_CONF_CHAR:
 726                 cssids_parm = (void *)&sccl_area->list_parm;
 727                 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
 728                 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
 729                 break;
 730         }
 731         ccode = chsc(sccl_area);
 732         if (ccode != 0) {
 733                 ret = -EIO;
 734                 goto out_free;
 735         }
 736         if (sccl_area->response.code != 0x0001) {
 737                 ret = -EIO;
 738                 CHSC_MSG(0, "sccl: response code=%x\n",
 739                          sccl_area->response.code);
 740                 goto out_free;
 741         }
 742         memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
 743         if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
 744                 ret = -EFAULT;
 745         else
 746                 ret = 0;
 747 out_free:
 748         kfree(ccl);
 749         free_page((unsigned long)sccl_area);
 750         return ret;
 751 }
 752
 753 static int chsc_ioctl_chpd(void __user *user_chpd)
 754 {
 755         struct chsc_scpd *scpd_area;
 756         struct chsc_cpd_info *chpd;
 757         int ret;
 758
 759         chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
 760         scpd_area = (void *)get_zeroed_page(GFP_KERNEL);
 761         if (!scpd_area || !chpd) {
 762                 ret = -ENOMEM;
 763                 goto out_free;
 764         }
 765         if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
 766                 ret = -EFAULT;
 767                 goto out_free;
 768         }
 769         ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
 770                                                chpd->rfmt, chpd->c, chpd->m,
 771                                                scpd_area);
 772         if (ret)
 773                 goto out_free;
 774         memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
 775         if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
 776                 ret = -EFAULT;
 777 out_free:
 778         kfree(chpd);
 779         free_page((unsigned long)scpd_area);
 780         return ret;
 781 }
 782
 783 static int chsc_ioctl_dcal(void __user *user_dcal)
 784 {
 785         struct chsc_dcal *dcal;
 786         int ret, ccode;
 787         struct {
 788                 struct chsc_header request;
 789                 u32 atype : 8;
 790                 u32 : 4;
 791                 u32 fmt : 4;
 792                 u32 : 16;
 793                 u32 res0[2];
 794                 u32 list_parm[2];
 795                 u32 res1[2];
 796                 struct chsc_header response;
 797                 u8 data[PAGE_SIZE - 36];
 798         } __attribute__ ((packed)) *sdcal_area;
 799
 800         sdcal_area = (void *)get_zeroed_page(GFP_KERNEL);
 801         if (!sdcal_area)
 802                 return -ENOMEM;
 803         dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
 804         if (!dcal) {
 805                 ret = -ENOMEM;
 806                 goto out_free;
 807         }
 808         if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
 809                 ret = -EFAULT;
 810                 goto out_free;
 811         }
 812         sdcal_area->request.length = 0x0020;
 813         sdcal_area->request.code = 0x0034;
 814         sdcal_area->atype = dcal->req.atype;
 815         sdcal_area->fmt = dcal->req.fmt;
 816         memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
 817                sizeof(sdcal_area->list_parm));
 818
 819         ccode = chsc(sdcal_area);
 820         if (ccode != 0) {
 821                 ret = -EIO;
 822                 goto out_free;
 823         }
 824         if (sdcal_area->response.code != 0x0001) {
 825                 ret = -EIO;
 826                 CHSC_MSG(0, "sdcal: response code=%x\n",
 827                          sdcal_area->response.code);
 828                 goto out_free;
 829         }
 830         memcpy(&dcal->sdcal, &sdcal_area->response,
 831                sdcal_area->response.length);
 832         if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
 833                 ret = -EFAULT;
 834         else
 835                 ret = 0;
 836 out_free:
 837         kfree(dcal);
 838         free_page((unsigned long)sdcal_area);
 839         return ret;
 840 }
 841
 842 static long chsc_ioctl(struct file *filp, unsigned int cmd,
 843                        unsigned long arg)
 844 {
 845         void __user *argp;
 846
 847         CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
 848         if (is_compat_task())
 849                 argp = compat_ptr(arg);
 850         else
 851                 argp = (void __user *)arg;
 852         switch (cmd) {
 853         case CHSC_START:
 854                 return chsc_ioctl_start(argp);
 855         case CHSC_START_SYNC:
 856                 return chsc_ioctl_start_sync(argp);
 857         case CHSC_INFO_CHANNEL_PATH:
 858                 return chsc_ioctl_info_channel_path(argp);
 859         case CHSC_INFO_CU:
 860                 return chsc_ioctl_info_cu(argp);
 861         case CHSC_INFO_SCH_CU:
 862                 return chsc_ioctl_info_sch_cu(argp);
 863         case CHSC_INFO_CI:
 864                 return chsc_ioctl_conf_info(argp);
 865         case CHSC_INFO_CCL:
 866                 return chsc_ioctl_conf_comp_list(argp);
 867         case CHSC_INFO_CPD:
 868                 return chsc_ioctl_chpd(argp);
 869         case CHSC_INFO_DCAL:
 870                 return chsc_ioctl_dcal(argp);
 871         case CHSC_ON_CLOSE_SET:
 872                 return chsc_ioctl_on_close_set(argp);
 873         case CHSC_ON_CLOSE_REMOVE:
 874                 return chsc_ioctl_on_close_remove();
 875         default: /* unknown ioctl number */
 876                 return -ENOIOCTLCMD;
 877         }
 878 }
 879
 880 static atomic_t chsc_ready_for_use = ATOMIC_INIT(1);
 881
 882 static int chsc_open(struct inode *inode, struct file *file)
 883 {
 884         if (!atomic_dec_and_test(&chsc_ready_for_use)) {
 885                 atomic_inc(&chsc_ready_for_use);
 886                 return -EBUSY;
 887         }
 888         return nonseekable_open(inode, file);
 889 }
 890
 891 static int chsc_release(struct inode *inode, struct file *filp)
 892 {
 893         char dbf[13];
 894         int ret;
 895
 896         mutex_lock(&on_close_mutex);
 897         if (!on_close_chsc_area)
 898                 goto out_unlock;
 899         init_completion(&on_close_request->completion);
 900         CHSC_LOG(0, "on_close");
 901         chsc_log_command(on_close_chsc_area);
 902         spin_lock_irq(&chsc_lock);
 903         ret = chsc_async(on_close_chsc_area, on_close_request);
 904         spin_unlock_irq(&chsc_lock);
 905         if (ret == -EINPROGRESS) {
 906                 wait_for_completion(&on_close_request->completion);
 907                 ret = chsc_examine_irb(on_close_request);
 908         }
 909         snprintf(dbf, sizeof(dbf), "relret:%d", ret);
 910         CHSC_LOG(0, dbf);
 911         free_page((unsigned long)on_close_chsc_area);
 912         on_close_chsc_area = NULL;
 913         kfree(on_close_request);
 914         on_close_request = NULL;
 915 out_unlock:
 916         mutex_unlock(&on_close_mutex);
 917         atomic_inc(&chsc_ready_for_use);
 918         return 0;
 919 }
 920
 921 static const struct file_operations chsc_fops = {
 922         .owner = THIS_MODULE,
 923         .open = chsc_open,
 924         .release = chsc_release,
 925         .unlocked_ioctl = chsc_ioctl,
 926         .compat_ioctl = chsc_ioctl,
 927 };
 928
 929 static struct miscdevice chsc_misc_device = {
 930         .minor = MISC_DYNAMIC_MINOR,
 931         .name = "chsc",
 932         .fops = &chsc_fops,
 933 };
 934
 935 static int __init chsc_misc_init(void)
 936 {
 937         return misc_register(&chsc_misc_device);
 938 }
 939
 940 static void chsc_misc_cleanup(void)
 941 {
 942         misc_deregister(&chsc_misc_device);
 943 }
 944
 945 static int __init chsc_sch_init(void)
 946 {
 947         int ret;
 948
 949         ret = chsc_init_dbfs();
 950         if (ret)
 951                 return ret;
 952         isc_register(CHSC_SCH_ISC);
 953         ret = chsc_init_sch_driver();
 954         if (ret)
 955                 goto out_dbf;
 956         ret = chsc_misc_init();
 957         if (ret)
 958                 goto out_driver;
 959         return ret;
 960 out_driver:
 961         chsc_cleanup_sch_driver();
 962 out_dbf:
 963         isc_unregister(CHSC_SCH_ISC);
 964         chsc_remove_dbfs();
 965         return ret;
 966 }
 967
 968 static void __exit chsc_sch_exit(void)
 969 {
 970         chsc_misc_cleanup();
 971         chsc_cleanup_sch_driver();
 972         isc_unregister(CHSC_SCH_ISC);
 973         chsc_remove_dbfs();
 974 }
 975
 976 module_init(chsc_sch_init);
 977 module_exit(chsc_sch_exit);